Merge tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64

Pull arm64 support from Catalin Marinas:
 "Linux support for the 64-bit ARM architecture (AArch64)

  Features currently supported:
   - 39-bit address space for user and kernel (each)
   - 4KB and 64KB page configurations
   - Compat (32-bit) user applications (ARMv7, EABI only)
   - Flattened Device Tree (mandated for all AArch64 platforms)
   - ARM generic timers"

* tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64: (35 commits)
  arm64: ptrace: remove obsolete ptrace request numbers from user headers
  arm64: Do not set the SMP/nAMP processor bit
  arm64: MAINTAINERS update
  arm64: Build infrastructure
  arm64: Miscellaneous header files
  arm64: Generic timers support
  arm64: Loadable modules
  arm64: Miscellaneous library functions
  arm64: Performance counters support
  arm64: Add support for /proc/sys/debug/exception-trace
  arm64: Debugging support
  arm64: Floating point and SIMD
  arm64: 32-bit (compat) applications support
  arm64: User access library functions
  arm64: Signal handling support
  arm64: VDSO support
  arm64: System calls handling
  arm64: ELF definitions
  arm64: SMP support
  arm64: DMA mapping API
  ...

171 files changed, 21762 insertions, 6 deletions

diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt
new file mode 100644
index 00000000000..9c4d388dadd
--- /dev/null
+++ b/Documentation/arm64/booting.txt
@@ -0,0 +1,152 @@
+                        Booting AArch64 Linux
+                        =====================
+
+Author: Will Deacon <will.deacon@arm.com>
+Date  : 07 September 2012
+
+This document is based on the ARM booting document by Russell King and
+is relevant to all public releases of the AArch64 Linux kernel.
+
+The AArch64 exception model is made up of a number of exception levels
+(EL0 - EL3), with EL0 and EL1 having a secure and a non-secure
+counterpart.  EL2 is the hypervisor level and exists only in non-secure
+mode. EL3 is the highest priority level and exists only in secure mode.
+
+For the purposes of this document, we will use the term `boot loader'
+simply to define all software that executes on the CPU(s) before control
+is passed to the Linux kernel.  This may include secure monitor and
+hypervisor code, or it may just be a handful of instructions for
+preparing a minimal boot environment.
+
+Essentially, the boot loader should provide (as a minimum) the
+following:
+
+1. Setup and initialise the RAM
+2. Setup the device tree
+3. Decompress the kernel image
+4. Call the kernel image
+
+
+1. Setup and initialise RAM
+---------------------------
+
+Requirement: MANDATORY
+
+The boot loader is expected to find and initialise all RAM that the
+kernel will use for volatile data storage in the system.  It performs
+this in a machine dependent manner.  (It may use internal algorithms
+to automatically locate and size all RAM, or it may use knowledge of
+the RAM in the machine, or any other method the boot loader designer
+sees fit.)
+
+
+2. Setup the device tree
+-------------------------
+
+Requirement: MANDATORY
+
+The device tree blob (dtb) must be no bigger than 2 megabytes in size
+and placed at a 2-megabyte boundary within the first 512 megabytes from
+the start of the kernel image. This is to allow the kernel to map the
+blob using a single section mapping in the initial page tables.
+
+
+3. Decompress the kernel image
+------------------------------
+
+Requirement: OPTIONAL
+
+The AArch64 kernel does not currently provide a decompressor and
+therefore requires decompression (gzip etc.) to be performed by the boot
+loader if a compressed Image target (e.g. Image.gz) is used.  For
+bootloaders that do not implement this requirement, the uncompressed
+Image target is available instead.
+
+
+4. Call the kernel image
+------------------------
+
+Requirement: MANDATORY
+
+The decompressed kernel image contains a 32-byte header as follows:
+
+  u32 magic     = 0x14000008;   /* branch to stext, little-endian */
+  u32 res0      = 0;            /* reserved */
+  u64 text_offset;              /* Image load offset */
+  u64 res1      = 0;            /* reserved */
+  u64 res2      = 0;            /* reserved */
+
+The image must be placed at the specified offset (currently 0x80000)
+from the start of the system RAM and called there. The start of the
+system RAM must be aligned to 2MB.
+
+Before jumping into the kernel, the following conditions must be met:
+
+- Quiesce all DMA capable devices so that memory does not get
+  corrupted by bogus network packets or disk data.  This will save
+  you many hours of debug.
+
+- Primary CPU general-purpose register settings
+  x0 = physical address of device tree blob (dtb) in system RAM.
+  x1 = 0 (reserved for future use)
+  x2 = 0 (reserved for future use)
+  x3 = 0 (reserved for future use)
+
+- CPU mode
+  All forms of interrupts must be masked in PSTATE.DAIF (Debug, SError,
+  IRQ and FIQ).
+  The CPU must be in either EL2 (RECOMMENDED in order to have access to
+  the virtualisation extensions) or non-secure EL1.
+
+- Caches, MMUs
+  The MMU must be off.
+  Instruction cache may be on or off.
+  Data cache must be off and invalidated.
+  External caches (if present) must be configured and disabled.
+
+- Architected timers
+  CNTFRQ must be programmed with the timer frequency.
+  If entering the kernel at EL1, CNTHCTL_EL2 must have EL1PCTEN (bit 0)
+  set where available.
+
+- Coherency
+  All CPUs to be booted by the kernel must be part of the same coherency
+  domain on entry to the kernel.  This may require IMPLEMENTATION DEFINED
+  initialisation to enable the receiving of maintenance operations on
+  each CPU.
+
+- System registers
+  All writable architected system registers at the exception level where
+  the kernel image will be entered must be initialised by software at a
+  higher exception level to prevent execution in an UNKNOWN state.
+
+The boot loader is expected to enter the kernel on each CPU in the
+following manner:
+
+- The primary CPU must jump directly to the first instruction of the
+  kernel image.  The device tree blob passed by this CPU must contain
+  for each CPU node:
+
+    1. An 'enable-method' property. Currently, the only supported value
+       for this field is the string "spin-table".
+
+    2. A 'cpu-release-addr' property identifying a 64-bit,
+       zero-initialised memory location.
+
+  It is expected that the bootloader will generate these device tree
+  properties and insert them into the blob prior to kernel entry.
+
+- Any secondary CPUs must spin outside of the kernel in a reserved area
+  of memory (communicated to the kernel by a /memreserve/ region in the
+  device tree) polling their cpu-release-addr location, which must be
+  contained in the reserved region.  A wfe instruction may be inserted
+  to reduce the overhead of the busy-loop and a sev will be issued by
+  the primary CPU.  When a read of the location pointed to by the
+  cpu-release-addr returns a non-zero value, the CPU must jump directly
+  to this value.
+
+- Secondary CPU general-purpose register settings
+  x0 = 0 (reserved for future use)
+  x1 = 0 (reserved for future use)
+  x2 = 0 (reserved for future use)
+  x3 = 0 (reserved for future use)
diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt
new file mode 100644
index 00000000000..dbbdcbba75a
--- /dev/null
+++ b/Documentation/arm64/memory.txt
@@ -0,0 +1,73 @@
+                     Memory Layout on AArch64 Linux
+                     ==============================
+
+Author: Catalin Marinas <catalin.marinas@arm.com>
+Date  : 20 February 2012
+
+This document describes the virtual memory layout used by the AArch64
+Linux kernel. The architecture allows up to 4 levels of translation
+tables with a 4KB page size and up to 3 levels with a 64KB page size.
+
+AArch64 Linux uses 3 levels of translation tables with the 4KB page
+configuration, allowing 39-bit (512GB) virtual addresses for both user
+and kernel. With 64KB pages, only 2 levels of translation tables are
+used but the memory layout is the same.
+
+User addresses have bits 63:39 set to 0 while the kernel addresses have
+the same bits set to 1. TTBRx selection is given by bit 63 of the
+virtual address. The swapper_pg_dir contains only kernel (global)
+mappings while the user pgd contains only user (non-global) mappings.
+The swapper_pgd_dir address is written to TTBR1 and never written to
+TTBR0.
+
+
+AArch64 Linux memory layout:
+
+Start                   End                     Size            Use
+-----------------------------------------------------------------------
+0000000000000000        0000007fffffffff         512GB          user
+
+ffffff8000000000        ffffffbbfffcffff        ~240GB          vmalloc
+
+ffffffbbfffd0000        ffffffbcfffdffff          64KB          [guard page]
+
+ffffffbbfffe0000        ffffffbcfffeffff          64KB          PCI I/O space
+
+ffffffbbffff0000        ffffffbcffffffff          64KB          [guard page]
+
+ffffffbc00000000        ffffffbdffffffff           8GB          vmemmap
+
+ffffffbe00000000        ffffffbffbffffff          ~8GB          [guard, future vmmemap]
+
+ffffffbffc000000        ffffffbfffffffff          64MB          modules
+
+ffffffc000000000        ffffffffffffffff         256GB          memory
+
+
+Translation table lookup with 4KB pages:
+
++--------+--------+--------+--------+--------+--------+--------+--------+
+|63    56|55    48|47    40|39    32|31    24|23    16|15     8|7      0|
++--------+--------+--------+--------+--------+--------+--------+--------+
+ |                 |         |         |         |         |
+ |                 |         |         |         |         v
+ |                 |         |         |         |   [11:0]  in-page offset
+ |                 |         |         |         +-> [20:12] L3 index
+ |                 |         |         +-----------> [29:21] L2 index
+ |                 |         +---------------------> [38:30] L1 index
+ |                 +-------------------------------> [47:39] L0 index (not used)
+ +-------------------------------------------------> [63] TTBR0/1
+
+
+Translation table lookup with 64KB pages:
+
++--------+--------+--------+--------+--------+--------+--------+--------+
+|63    56|55    48|47    40|39    32|31    24|23    16|15     8|7      0|
++--------+--------+--------+--------+--------+--------+--------+--------+
+ |                 |    |               |              |
+ |                 |    |               |              v
+ |                 |    |               |            [15:0]  in-page offset
+ |                 |    |               +----------> [28:16] L3 index
+ |                 |    +--------------------------> [41:29] L2 index (only 38:29 used)
+ |                 +-------------------------------> [47:42] L1 index (not used)
+ +-------------------------------------------------> [63] TTBR0/1
diff --git a/MAINTAINERS b/MAINTAINERS
index 9362f54bccb..c98b1a1520d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1209,6 +1209,12 @@ S:	Maintained
 F:      arch/arm/mach-pxa/z2.c
 F:      arch/arm/mach-pxa/include/mach/z2.h
 
+ARM64 PORT (AARCH64 ARCHITECTURE)
+M:      Catalin Marinas <catalin.marinas@arm.com>
+L:      linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+S:      Maintained
+F:      arch/arm64/
+
 ASC7621 HARDWARE MONITOR DRIVER
 M:      George Joseph <george.joseph@fairview5.com>
 L:      lm-sensors@lm-sensors.org
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
new file mode 100644
index 00000000000..767ba568545
--- /dev/null
+++ b/arch/arm64/Kconfig
@@ -0,0 +1,222 @@
+config ARM64
+        def_bool y
+        select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
+        select GENERIC_CLOCKEVENTS
+        select GENERIC_HARDIRQS_NO_DEPRECATED
+        select GENERIC_IOMAP
+        select GENERIC_IRQ_PROBE
+        select GENERIC_IRQ_SHOW
+        select GENERIC_SMP_IDLE_THREAD
+        select GENERIC_TIME_VSYSCALL
+        select HARDIRQS_SW_RESEND
+        select HAVE_ARCH_TRACEHOOK
+        select HAVE_DMA_API_DEBUG
+        select HAVE_DMA_ATTRS
+        select HAVE_GENERIC_DMA_COHERENT
+        select HAVE_GENERIC_HARDIRQS
+        select HAVE_HW_BREAKPOINT if PERF_EVENTS
+        select HAVE_IRQ_WORK
+        select HAVE_MEMBLOCK
+        select HAVE_PERF_EVENTS
+        select HAVE_SPARSE_IRQ
+        select IRQ_DOMAIN
+        select NO_BOOTMEM
+        select OF
+        select OF_EARLY_FLATTREE
+        select PERF_USE_VMALLOC
+        select RTC_LIB
+        select SPARSE_IRQ
+        help
+          ARM 64-bit (AArch64) Linux support.
+
+config 64BIT
+        def_bool y
+
+config ARCH_PHYS_ADDR_T_64BIT
+        def_bool y
+
+config MMU
+        def_bool y
+
+config NO_IOPORT
+        def_bool y
+
+config STACKTRACE_SUPPORT
+        def_bool y
+
+config LOCKDEP_SUPPORT
+        def_bool y
+
+config TRACE_IRQFLAGS_SUPPORT
+        def_bool y
+
+config GENERIC_LOCKBREAK
+        def_bool y
+        depends on SMP && PREEMPT
+
+config RWSEM_GENERIC_SPINLOCK
+        def_bool y
+
+config GENERIC_HWEIGHT
+        def_bool y
+
+config GENERIC_CSUM
+        def_bool y
+
+config GENERIC_CALIBRATE_DELAY
+        def_bool y
+
+config ZONE_DMA32
+        def_bool y
+
+config ARCH_DMA_ADDR_T_64BIT
+        def_bool y
+
+config NEED_DMA_MAP_STATE
+        def_bool y
+
+config NEED_SG_DMA_LENGTH
+        def_bool y
+
+config SWIOTLB
+        def_bool y
+
+config IOMMU_HELPER
+        def_bool SWIOTLB
+
+source "init/Kconfig"
+
+source "kernel/Kconfig.freezer"
+
+menu "System Type"
+
+endmenu
+
+menu "Bus support"
+
+config ARM_AMBA
+        bool
+
+endmenu
+
+menu "Kernel Features"
+
+source "kernel/time/Kconfig"
+
+config ARM64_64K_PAGES
+        bool "Enable 64KB pages support"
+        help
+          This feature enables 64KB pages support (4KB by default)
+          allowing only two levels of page tables and faster TLB
+          look-up. AArch32 emulation is not available when this feature
+          is enabled.
+
+config SMP
+        bool "Symmetric Multi-Processing"
+        select USE_GENERIC_SMP_HELPERS
+        help
+          This enables support for systems with more than one CPU.  If
+          you say N here, the kernel will run on single and
+          multiprocessor machines, but will use only one CPU of a
+          multiprocessor machine. If you say Y here, the kernel will run
+          on many, but not all, single processor machines. On a single
+          processor machine, the kernel will run faster if you say N
+          here.
+
+          If you don't know what to do here, say N.
+
+config NR_CPUS
+        int "Maximum number of CPUs (2-32)"
+        range 2 32
+        depends on SMP
+        default "4"
+
+source kernel/Kconfig.preempt
+
+config HZ
+        int
+        default 100
+
+config ARCH_HAS_HOLES_MEMORYMODEL
+        def_bool y if SPARSEMEM
+
+config ARCH_SPARSEMEM_ENABLE
+        def_bool y
+        select SPARSEMEM_VMEMMAP_ENABLE
+
+config ARCH_SPARSEMEM_DEFAULT
+        def_bool ARCH_SPARSEMEM_ENABLE
+
+config ARCH_SELECT_MEMORY_MODEL
+        def_bool ARCH_SPARSEMEM_ENABLE
+
+config HAVE_ARCH_PFN_VALID
+        def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
+
+config HW_PERF_EVENTS
+        bool "Enable hardware performance counter support for perf events"
+        depends on PERF_EVENTS
+        default y
+        help
+          Enable hardware performance counter support for perf events. If
+          disabled, perf events will use software events only.
+
+source "mm/Kconfig"
+
+endmenu
+
+menu "Boot options"
+
+config CMDLINE
+        string "Default kernel command string"
+        default ""
+        help
+          Provide a set of default command-line options at build time by
+          entering them here. As a minimum, you should specify the the
+          root device (e.g. root=/dev/nfs).
+
+config CMDLINE_FORCE
+        bool "Always use the default kernel command string"
+        help
+          Always use the default kernel command string, even if the boot
+          loader passes other arguments to the kernel.
+          This is useful if you cannot or don't want to change the
+          command-line options your boot loader passes to the kernel.
+
+endmenu
+
+menu "Userspace binary formats"
+
+source "fs/Kconfig.binfmt"
+
+config COMPAT
+        bool "Kernel support for 32-bit EL0"
+        depends on !ARM64_64K_PAGES
+        select COMPAT_BINFMT_ELF
+        help
+          This option enables support for a 32-bit EL0 running under a 64-bit
+          kernel at EL1. AArch32-specific components such as system calls,
+          the user helper functions, VFP support and the ptrace interface are
+          handled appropriately by the kernel.
+
+          If you want to execute 32-bit userspace applications, say Y.
+
+config SYSVIPC_COMPAT
+        def_bool y
+        depends on COMPAT && SYSVIPC
+
+endmenu
+
+source "net/Kconfig"
+
+source "drivers/Kconfig"
+
+source "fs/Kconfig"
+
+source "arch/arm64/Kconfig.debug"
+
+source "security/Kconfig"
+
+source "crypto/Kconfig"
+
+source "lib/Kconfig"
diff --git a/arch/arm64/Kconfig.debug b/arch/arm64/Kconfig.debug
new file mode 100644
index 00000000000..d7553f2bda6
--- /dev/null
+++ b/arch/arm64/Kconfig.debug
@@ -0,0 +1,27 @@
+menu "Kernel hacking"
+
+source "lib/Kconfig.debug"
+
+config FRAME_POINTER
+        bool
+        default y
+
+config DEBUG_ERRORS
+        bool "Verbose kernel error messages"
+        depends on DEBUG_KERNEL
+        help
+          This option controls verbose debugging information which can be
+          printed when the kernel detects an internal error. This debugging
+          information is useful to kernel hackers when tracking down problems,
+          but mostly meaningless to other people. It's safe to say Y unless
+          you are concerned with the code size or don't want to see these
+          messages.
+
+config DEBUG_STACK_USAGE
+        bool "Enable stack utilization instrumentation"
+        depends on DEBUG_KERNEL
+        help
+          Enables the display of the minimum amount of free stack which each
+          task has ever had available in the sysrq-T output.
+
+endmenu
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
new file mode 100644
index 00000000000..364191f3be4
--- /dev/null
+++ b/arch/arm64/Makefile
@@ -0,0 +1,71 @@
+#
+# arch/arm64/Makefile
+#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#
+# This file is subject to the terms and conditions of the GNU General Public
+# License.  See the file "COPYING" in the main directory of this archive
+# for more details.
+#
+# Copyright (C) 1995-2001 by Russell King
+
+LDFLAGS_vmlinux :=-p --no-undefined -X
+CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
+OBJCOPYFLAGS    :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
+GZFLAGS         :=-9
+
+LIBGCC          := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
+
+KBUILD_DEFCONFIG := defconfig
+
+KBUILD_CFLAGS   += -mgeneral-regs-only
+KBUILD_CPPFLAGS += -mlittle-endian
+AS              += -EL
+LD              += -EL
+
+comma = ,
+
+CHECKFLAGS      += -D__aarch64__
+
+# Default value
+head-y          := arch/arm64/kernel/head.o
+
+# The byte offset of the kernel image in RAM from the start of RAM.
+TEXT_OFFSET := 0x00080000
+
+export  TEXT_OFFSET GZFLAGS
+
+core-y          += arch/arm64/kernel/ arch/arm64/mm/
+libs-y          := arch/arm64/lib/ $(libs-y)
+libs-y          += $(LIBGCC)
+
+# Default target when executing plain make
+KBUILD_IMAGE := Image.gz
+
+all:    $(KBUILD_IMAGE)
+
+boot := arch/arm64/boot
+
+Image Image.gz: vmlinux
+        $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@
+
+zinstall install: vmlinux
+        $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $@
+
+%.dtb:
+        $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@
+
+# We use MRPROPER_FILES and CLEAN_FILES now
+archclean:
+        $(Q)$(MAKE) $(clean)=$(boot)
+
+define archhelp
+  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
+  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
+  echo  '  install       - Install uncompressed kernel'
+  echo  '  zinstall      - Install compressed kernel'
+  echo  '                  Install using (your) ~/bin/installkernel or'
+  echo  '                  (distribution) /sbin/installkernel or'
+  echo  '                  install to $$(INSTALL_PATH) and run lilo'
+endef
diff --git a/arch/arm64/boot/.gitignore b/arch/arm64/boot/.gitignore
new file mode 100644
index 00000000000..8dab0bb6ae6
--- /dev/null
+++ b/arch/arm64/boot/.gitignore
@@ -0,0 +1,2 @@
+Image
+Image.gz
diff --git a/arch/arm64/boot/Makefile b/arch/arm64/boot/Makefile
new file mode 100644
index 00000000000..eca209b2b0b
--- /dev/null
+++ b/arch/arm64/boot/Makefile
@@ -0,0 +1,36 @@
+#
+# arch/arm64/boot/Makefile
+#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#
+# This file is subject to the terms and conditions of the GNU General Public
+# License.  See the file "COPYING" in the main directory of this archive
+# for more details.
+#
+# Copyright (C) 2012, ARM Ltd.
+# Author: Will Deacon <will.deacon@arm.com>
+#
+# Based on the ia64 boot/Makefile.
+#
+
+targets := Image Image.gz
+
+$(obj)/Image: vmlinux FORCE
+        $(call if_changed,objcopy)
+
+$(obj)/Image.gz: $(obj)/Image FORCE
+        $(call if_changed,gzip)
+
+$(obj)/%.dtb: $(src)/dts/%.dts
+        $(call cmd,dtc)
+
+install: $(obj)/Image
+        $(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
+        $(obj)/Image System.map "$(INSTALL_PATH)"
+
+zinstall: $(obj)/Image.gz
+        $(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
+        $(obj)/Image.gz System.map "$(INSTALL_PATH)"
+
+clean-files += *.dtb
diff --git a/arch/arm64/boot/install.sh b/arch/arm64/boot/install.sh
new file mode 100644
index 00000000000..12ed78aa6f0
--- /dev/null
+++ b/arch/arm64/boot/install.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+#
+# arch/arm64/boot/install.sh
+#
+# This file is subject to the terms and conditions of the GNU General Public
+# License.  See the file "COPYING" in the main directory of this archive
+# for more details.
+#
+# Copyright (C) 1995 by Linus Torvalds
+#
+# Adapted from code in arch/i386/boot/Makefile by H. Peter Anvin
+# Adapted from code in arch/i386/boot/install.sh by Russell King
+#
+# "make install" script for the AArch64 Linux port
+#
+# Arguments:
+#   $1 - kernel version
+#   $2 - kernel image file
+#   $3 - kernel map file
+#   $4 - default install path (blank if root directory)
+#
+
+# User may have a custom install script
+if [ -x ~/bin/${INSTALLKERNEL} ]; then exec ~/bin/${INSTALLKERNEL} "$@"; fi
+if [ -x /sbin/${INSTALLKERNEL} ]; then exec /sbin/${INSTALLKERNEL} "$@"; fi
+
+if [ "$(basename $2)" = "Image.gz" ]; then
+# Compressed install
+  echo "Installing compressed kernel"
+  base=vmlinuz
+else
+# Normal install
+  echo "Installing normal kernel"
+  base=vmlinux
+fi
+
+if [ -f $4/$base-$1 ]; then
+  mv $4/$base-$1 $4/$base-$1.old
+fi
+cat $2 > $4/$base-$1
+
+# Install system map file
+if [ -f $4/System.map-$1 ]; then
+  mv $4/System.map-$1 $4/System.map-$1.old
+fi
+cp $3 $4/System.map-$1
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
new file mode 100644
index 00000000000..9212c7880da
--- /dev/null
+++ b/arch/arm64/configs/defconfig
@@ -0,0 +1,85 @@
+CONFIG_EXPERIMENTAL=y
+# CONFIG_LOCALVERSION_AUTO is not set
+# CONFIG_SWAP is not set
+CONFIG_SYSVIPC=y
+CONFIG_POSIX_MQUEUE=y
+CONFIG_BSD_PROCESS_ACCT=y
+CONFIG_BSD_PROCESS_ACCT_V3=y
+CONFIG_NO_HZ=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_IKCONFIG=y
+CONFIG_IKCONFIG_PROC=y
+CONFIG_LOG_BUF_SHIFT=14
+# CONFIG_UTS_NS is not set
+# CONFIG_IPC_NS is not set
+# CONFIG_PID_NS is not set
+# CONFIG_NET_NS is not set
+CONFIG_SCHED_AUTOGROUP=y
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_KALLSYMS_ALL=y
+# CONFIG_COMPAT_BRK is not set
+CONFIG_PROFILING=y
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+# CONFIG_BLK_DEV_BSG is not set
+# CONFIG_IOSCHED_DEADLINE is not set
+CONFIG_SMP=y
+CONFIG_PREEMPT_VOLUNTARY=y
+CONFIG_CMDLINE="console=ttyAMA0"
+# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
+CONFIG_COMPAT=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_IP_PNP=y
+CONFIG_IP_PNP_DHCP=y
+CONFIG_IP_PNP_BOOTP=y
+# CONFIG_INET_LRO is not set
+# CONFIG_IPV6 is not set
+# CONFIG_WIRELESS is not set
+CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
+CONFIG_DEVTMPFS=y
+# CONFIG_BLK_DEV is not set
+CONFIG_SCSI=y
+# CONFIG_SCSI_PROC_FS is not set
+CONFIG_BLK_DEV_SD=y
+# CONFIG_SCSI_LOWLEVEL is not set
+CONFIG_NETDEVICES=y
+CONFIG_MII=y
+# CONFIG_WLAN is not set
+CONFIG_INPUT_EVDEV=y
+# CONFIG_SERIO_I8042 is not set
+# CONFIG_SERIO_SERPORT is not set
+CONFIG_LEGACY_PTY_COUNT=16
+# CONFIG_HW_RANDOM is not set
+# CONFIG_HWMON is not set
+CONFIG_FB=y
+# CONFIG_VGA_CONSOLE is not set
+CONFIG_FRAMEBUFFER_CONSOLE=y
+CONFIG_LOGO=y
+# CONFIG_LOGO_LINUX_MONO is not set
+# CONFIG_LOGO_LINUX_VGA16 is not set
+# CONFIG_USB_SUPPORT is not set
+# CONFIG_IOMMU_SUPPORT is not set
+CONFIG_EXT2_FS=y
+CONFIG_EXT3_FS=y
+# CONFIG_EXT3_DEFAULTS_TO_ORDERED is not set
+# CONFIG_EXT3_FS_XATTR is not set
+CONFIG_FUSE_FS=y
+CONFIG_CUSE=y
+CONFIG_VFAT_FS=y
+CONFIG_TMPFS=y
+# CONFIG_MISC_FILESYSTEMS is not set
+CONFIG_NFS_FS=y
+CONFIG_ROOT_NFS=y
+CONFIG_NLS_CODEPAGE_437=y
+CONFIG_NLS_ISO8859_1=y
+CONFIG_MAGIC_SYSRQ=y
+CONFIG_DEBUG_FS=y
+CONFIG_DEBUG_KERNEL=y
+# CONFIG_SCHED_DEBUG is not set
+CONFIG_DEBUG_INFO=y
+# CONFIG_FTRACE is not set
+CONFIG_ATOMIC64_SELFTEST=y
+CONFIG_DEBUG_ERRORS=y
diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
new file mode 100644
index 00000000000..35924a542d4
--- /dev/null
+++ b/arch/arm64/include/asm/Kbuild
@@ -0,0 +1,51 @@
+include include/asm-generic/Kbuild.asm
+
+header-y += hwcap.h
+
+generic-y += bug.h
+generic-y += bugs.h
+generic-y += checksum.h
+generic-y += cputime.h
+generic-y += current.h
+generic-y += delay.h
+generic-y += div64.h
+generic-y += dma.h
+generic-y += emergency-restart.h
+generic-y += errno.h
+generic-y += ftrace.h
+generic-y += hw_irq.h
+generic-y += ioctl.h
+generic-y += ioctls.h
+generic-y += ipcbuf.h
+generic-y += irq_regs.h
+generic-y += kdebug.h
+generic-y += kmap_types.h
+generic-y += linkage.h
+generic-y += local.h
+generic-y += local64.h
+generic-y += mman.h
+generic-y += msgbuf.h
+generic-y += mutex.h
+generic-y += pci.h
+generic-y += percpu.h
+generic-y += poll.h
+generic-y += posix_types.h
+generic-y += resource.h
+generic-y += scatterlist.h
+generic-y += sections.h
+generic-y += segment.h
+generic-y += sembuf.h
+generic-y += serial.h
+generic-y += shmbuf.h
+generic-y += sizes.h
+generic-y += socket.h
+generic-y += sockios.h
+generic-y += string.h
+generic-y += switch_to.h
+generic-y += swab.h
+generic-y += termbits.h
+generic-y += termios.h
+generic-y += topology.h
+generic-y += types.h
+generic-y += unaligned.h
+generic-y += user.h
diff --git a/arch/arm64/include/asm/arm_generic.h b/arch/arm64/include/asm/arm_generic.h
new file mode 100644
index 00000000000..e4cec9d30f2
--- /dev/null
+++ b/arch/arm64/include/asm/arm_generic.h
@@ -0,0 +1,100 @@
+/*
+ * arch/arm64/include/asm/arm_generic.h
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_ARM_GENERIC_H
+#define __ASM_ARM_GENERIC_H
+
+#include <linux/clocksource.h>
+
+#define ARCH_TIMER_CTRL_ENABLE          (1 << 0)
+#define ARCH_TIMER_CTRL_IMASK           (1 << 1)
+#define ARCH_TIMER_CTRL_ISTATUS         (1 << 2)
+
+#define ARCH_TIMER_REG_CTRL             0
+#define ARCH_TIMER_REG_FREQ             1
+#define ARCH_TIMER_REG_TVAL             2
+
+static inline void arch_timer_reg_write(int reg, u32 val)
+{
+        switch (reg) {
+        case ARCH_TIMER_REG_CTRL:
+                asm volatile("msr cntp_ctl_el0,  %0" : : "r" (val));
+                break;
+        case ARCH_TIMER_REG_TVAL:
+                asm volatile("msr cntp_tval_el0, %0" : : "r" (val));
+                break;
+        default:
+                BUILD_BUG();
+        }
+
+        isb();
+}
+
+static inline u32 arch_timer_reg_read(int reg)
+{
+        u32 val;
+
+        switch (reg) {
+        case ARCH_TIMER_REG_CTRL:
+                asm volatile("mrs %0,  cntp_ctl_el0" : "=r" (val));
+                break;
+        case ARCH_TIMER_REG_FREQ:
+                asm volatile("mrs %0,   cntfrq_el0" : "=r" (val));
+                break;
+        case ARCH_TIMER_REG_TVAL:
+                asm volatile("mrs %0, cntp_tval_el0" : "=r" (val));
+                break;
+        default:
+                BUILD_BUG();
+        }
+
+        return val;
+}
+
+static inline void __cpuinit arch_counter_enable_user_access(void)
+{
+        u32 cntkctl;
+
+        /* Disable user access to the timers and the virtual counter. */
+        asm volatile("mrs       %0, cntkctl_el1" : "=r" (cntkctl));
+        cntkctl &= ~((3 << 8) | (1 << 1));
+
+        /* Enable user access to the physical counter and frequency. */
+        cntkctl |= 1;
+        asm volatile("msr       cntkctl_el1, %0" : : "r" (cntkctl));
+}
+
+static inline cycle_t arch_counter_get_cntpct(void)
+{
+        cycle_t cval;
+
+        asm volatile("mrs %0, cntpct_el0" : "=r" (cval));
+
+        return cval;
+}
+
+static inline cycle_t arch_counter_get_cntvct(void)
+{
+        cycle_t cval;
+
+        asm volatile("mrs %0, cntvct_el0" : "=r" (cval));
+
+        return cval;
+}
+
+#endif
diff --git a/arch/arm64/include/asm/asm-offsets.h b/arch/arm64/include/asm/asm-offsets.h
new file mode 100644
index 00000000000..d370ee36a18
--- /dev/null
+++ b/arch/arm64/include/asm/asm-offsets.h
@@ -0,0 +1 @@
+#include <generated/asm-offsets.h>
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
new file mode 100644
index 00000000000..da2a13e8f1e
--- /dev/null
+++ b/arch/arm64/include/asm/assembler.h
@@ -0,0 +1,109 @@
+/*
+ * Based on arch/arm/include/asm/assembler.h
+ *
+ * Copyright (C) 1996-2000 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASSEMBLY__
+#error "Only include this from assembly code"
+#endif
+
+#include <asm/ptrace.h>
+
+/*
+ * Stack pushing/popping (register pairs only). Equivalent to store decrement
+ * before, load increment after.
+ */
+        .macro  push, xreg1, xreg2
+        stp     \xreg1, \xreg2, [sp, #-16]!
+        .endm
+
+        .macro  pop, xreg1, xreg2
+        ldp     \xreg1, \xreg2, [sp], #16
+        .endm
+
+/*
+ * Enable and disable interrupts.
+ */
+        .macro  disable_irq
+        msr     daifset, #2
+        .endm
+
+        .macro  enable_irq
+        msr     daifclr, #2
+        .endm
+
+/*
+ * Save/disable and restore interrupts.
+ */
+        .macro  save_and_disable_irqs, olddaif
+        mrs     \olddaif, daif
+        disable_irq
+        .endm
+
+        .macro  restore_irqs, olddaif
+        msr     daif, \olddaif
+        .endm
+
+/*
+ * Enable and disable debug exceptions.
+ */
+        .macro  disable_dbg
+        msr     daifset, #8
+        .endm
+
+        .macro  enable_dbg
+        msr     daifclr, #8
+        .endm
+
+        .macro  disable_step, tmp
+        mrs     \tmp, mdscr_el1
+        bic     \tmp, \tmp, #1
+        msr     mdscr_el1, \tmp
+        .endm
+
+        .macro  enable_step, tmp
+        mrs     \tmp, mdscr_el1
+        orr     \tmp, \tmp, #1
+        msr     mdscr_el1, \tmp
+        .endm
+
+        .macro  enable_dbg_if_not_stepping, tmp
+        mrs     \tmp, mdscr_el1
+        tbnz    \tmp, #1, 9990f
+        enable_dbg
+9990:
+        .endm
+
+/*
+ * SMP data memory barrier
+ */
+        .macro  smp_dmb, opt
+#ifdef CONFIG_SMP
+        dmb     \opt
+#endif
+        .endm
+
+#define USER(l, x...)                           \
+9999:   x;                                      \
+        .section __ex_table,"a";                \
+        .align  3;                              \
+        .quad   9999b,l;                        \
+        .previous
+
+/*
+ * Register aliases.
+ */
+lr      .req    x30             // link register
diff --git a/arch/arm64/include/asm/atomic.h b/arch/arm64/include/asm/atomic.h
new file mode 100644
index 00000000000..407717ba060
--- /dev/null
+++ b/arch/arm64/include/asm/atomic.h
@@ -0,0 +1,305 @@
+/*
+ * Based on arch/arm/include/asm/atomic.h
+ *
+ * Copyright (C) 1996 Russell King.
+ * Copyright (C) 2002 Deep Blue Solutions Ltd.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_ATOMIC_H
+#define __ASM_ATOMIC_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+#include <asm/barrier.h>
+#include <asm/cmpxchg.h>
+
+#define ATOMIC_INIT(i)  { (i) }
+
+#ifdef __KERNEL__
+
+/*
+ * On ARM, ordinary assignment (str instruction) doesn't clear the local
+ * strex/ldrex monitor on some implementations. The reason we can use it for
+ * atomic_set() is the clrex or dummy strex done on every exception return.
+ */
+#define atomic_read(v)  (*(volatile int *)&(v)->counter)
+#define atomic_set(v,i) (((v)->counter) = (i))
+
+/*
+ * AArch64 UP and SMP safe atomic ops.  We use load exclusive and
+ * store exclusive to ensure that these are atomic.  We may loop
+ * to ensure that the update happens.
+ */
+static inline void atomic_add(int i, atomic_t *v)
+{
+        unsigned long tmp;
+        int result;
+
+        asm volatile("// atomic_add\n"
+"1:     ldxr    %w0, [%3]\n"
+"       add     %w0, %w0, %w4\n"
+"       stxr    %w1, %w0, [%3]\n"
+"       cbnz    %w1, 1b"
+        : "=&r" (result), "=&r" (tmp), "+o" (v->counter)
+        : "r" (&v->counter), "Ir" (i)
+        : "cc");
+}
+
+static inline int atomic_add_return(int i, atomic_t *v)
+{
+        unsigned long tmp;
+        int result;
+
+        asm volatile("// atomic_add_return\n"
+"1:     ldaxr   %w0, [%3]\n"
+"       add     %w0, %w0, %w4\n"
+"       stlxr   %w1, %w0, [%3]\n"
+"       cbnz    %w1, 1b"
+        : "=&r" (result), "=&r" (tmp), "+o" (v->counter)
+        : "r" (&v->counter), "Ir" (i)
+        : "cc");
+
+        return result;
+}
+
+static inline void atomic_sub(int i, atomic_t *v)
+{
+        unsigned long tmp;
+        int result;
+
+        asm volatile("// atomic_sub\n"
+"1:     ldxr    %w0, [%3]\n"
+"       sub     %w0, %w0, %w4\n"
+"       stxr    %w1, %w0, [%3]\n"
+"       cbnz    %w1, 1b"
+        : "=&r" (result), "=&r" (tmp), "+o" (v->counter)
+        : "r" (&v->counter), "Ir" (i)
+        : "cc");
+}
+
+static inline int atomic_sub_return(int i, atomic_t *v)
+{
+        unsigned long tmp;
+        int result;
+
+        asm volatile("// atomic_sub_return\n"
+"1:     ldaxr   %w0, [%3]\n"
+"       sub     %w0, %w0, %w4\n"
+"       stlxr   %w1, %w0, [%3]\n"
+"       cbnz    %w1, 1b"
+        : "=&r" (result), "=&r" (tmp), "+o" (v->counter)
+        : "r" (&v->counter), "Ir" (i)
+        : "cc");
+
+        return result;
+}
+
+static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new)
+{
+        unsigned long tmp;
+        int oldval;
+
+        asm volatile("// atomic_cmpxchg\n"
+"1:     ldaxr   %w1, [%3]\n"
+"       cmp     %w1, %w4\n"
+"       b.ne    2f\n"
+"       stlxr   %w0, %w5, [%3]\n"
+"       cbnz    %w0, 1b\n"
+"2:"
+        : "=&r" (tmp), "=&r" (oldval), "+o" (ptr->counter)
+        : "r" (&ptr->counter), "Ir" (old), "r" (new)
+        : "cc");
+
+        return oldval;
+}
+
+static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
+{
+        unsigned long tmp, tmp2;
+
+        asm volatile("// atomic_clear_mask\n"
+"1:     ldxr    %0, [%3]\n"
+"       bic     %0, %0, %4\n"
+"       stxr    %w1, %0, [%3]\n"
+"       cbnz    %w1, 1b"
+        : "=&r" (tmp), "=&r" (tmp2), "+o" (*addr)
+        : "r" (addr), "Ir" (mask)
+        : "cc");
+}
+
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
+{
+        int c, old;
+
+        c = atomic_read(v);
+        while (c != u && (old = atomic_cmpxchg((v), c, c + a)) != c)
+                c = old;
+        return c;
+}
+
+#define atomic_inc(v)           atomic_add(1, v)
+#define atomic_dec(v)           atomic_sub(1, v)
+
+#define atomic_inc_and_test(v)  (atomic_add_return(1, v) == 0)
+#define atomic_dec_and_test(v)  (atomic_sub_return(1, v) == 0)
+#define atomic_inc_return(v)    (atomic_add_return(1, v))
+#define atomic_dec_return(v)    (atomic_sub_return(1, v))
+#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
+
+#define atomic_add_negative(i,v) (atomic_add_return(i, v) < 0)
+
+#define smp_mb__before_atomic_dec()     smp_mb()
+#define smp_mb__after_atomic_dec()      smp_mb()
+#define smp_mb__before_atomic_inc()     smp_mb()
+#define smp_mb__after_atomic_inc()      smp_mb()
+
+/*
+ * 64-bit atomic operations.
+ */
+#define ATOMIC64_INIT(i) { (i) }
+
+#define atomic64_read(v)        (*(volatile long long *)&(v)->counter)
+#define atomic64_set(v,i)       (((v)->counter) = (i))
+
+static inline void atomic64_add(u64 i, atomic64_t *v)
+{
+        long result;
+        unsigned long tmp;
+
+        asm volatile("// atomic64_add\n"
+"1:     ldxr    %0, [%3]\n"
+"       add     %0, %0, %4\n"
+"       stxr    %w1, %0, [%3]\n"
+"       cbnz    %w1, 1b"
+        : "=&r" (result), "=&r" (tmp), "+o" (v->counter)
+        : "r" (&v->counter), "Ir" (i)
+        : "cc");
+}
+
+static inline long atomic64_add_return(long i, atomic64_t *v)
+{
+        long result;
+        unsigned long tmp;
+
+        asm volatile("// atomic64_add_return\n"
+"1:     ldaxr   %0, [%3]\n"
+"       add     %0, %0, %4\n"
+"       stlxr   %w1, %0, [%3]\n"
+"       cbnz    %w1, 1b"
+        : "=&r" (result), "=&r" (tmp), "+o" (v->counter)
+        : "r" (&v->counter), "Ir" (i)
+        : "cc");
+
+        return result;
+}
+
+static inline void atomic64_sub(u64 i, atomic64_t *v)
+{
+        long result;
+        unsigned long tmp;
+
+        asm volatile("// atomic64_sub\n"
+"1:     ldxr    %0, [%3]\n"
+"       sub     %0, %0, %4\n"
+"       stxr    %w1, %0, [%3]\n"
+"       cbnz    %w1, 1b"
+        : "=&r" (result), "=&r" (tmp), "+o" (v->counter)
+        : "r" (&v->counter), "Ir" (i)
+        : "cc");
+}
+
+static inline long atomic64_sub_return(long i, atomic64_t *v)
+{
+        long result;
+        unsigned long tmp;
+
+        asm volatile("// atomic64_sub_return\n"
+"1:     ldaxr   %0, [%3]\n"
+"       sub     %0, %0, %4\n"
+"       stlxr   %w1, %0, [%3]\n"
+"       cbnz    %w1, 1b"
+        : "=&r" (result), "=&r" (tmp), "+o" (v->counter)
+        : "r" (&v->counter), "Ir" (i)
+        : "cc");
+
+        return result;
+}
+
+static inline long atomic64_cmpxchg(atomic64_t *ptr, long old, long new)
+{
+        long oldval;
+        unsigned long res;
+
+        asm volatile("// atomic64_cmpxchg\n"
+"1:     ldaxr   %1, [%3]\n"
+"       cmp     %1, %4\n"
+"       b.ne    2f\n"
+"       stlxr   %w0, %5, [%3]\n"
+"       cbnz    %w0, 1b\n"
+"2:"
+        : "=&r" (res), "=&r" (oldval), "+o" (ptr->counter)
+        : "r" (&ptr->counter), "Ir" (old), "r" (new)
+        : "cc");
+
+        return oldval;
+}
+
+#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
+
+static inline long atomic64_dec_if_positive(atomic64_t *v)
+{
+        long result;
+        unsigned long tmp;
+
+        asm volatile("// atomic64_dec_if_positive\n"
+"1:     ldaxr   %0, [%3]\n"
+"       subs    %0, %0, #1\n"
+"       b.mi    2f\n"
+"       stlxr   %w1, %0, [%3]\n"
+"       cbnz    %w1, 1b\n"
+"2:"
+        : "=&r" (result), "=&r" (tmp), "+o" (v->counter)
+        : "r" (&v->counter)
+        : "cc");
+
+        return result;
+}
+
+static inline int atomic64_add_unless(atomic64_t *v, long a, long u)
+{
+        long c, old;
+
+        c = atomic64_read(v);
+        while (c != u && (old = atomic64_cmpxchg((v), c, c + a)) != c)
+                c = old;
+
+        return c != u;
+}
+
+#define atomic64_add_negative(a, v)     (atomic64_add_return((a), (v)) < 0)
+#define atomic64_inc(v)                 atomic64_add(1LL, (v))
+#define atomic64_inc_return(v)          atomic64_add_return(1LL, (v))
+#define atomic64_inc_and_test(v)        (atomic64_inc_return(v) == 0)
+#define atomic64_sub_and_test(a, v)     (atomic64_sub_return((a), (v)) == 0)
+#define atomic64_dec(v)                 atomic64_sub(1LL, (v))
+#define atomic64_dec_return(v)          atomic64_sub_return(1LL, (v))
+#define atomic64_dec_and_test(v)        (atomic64_dec_return((v)) == 0)
+#define atomic64_inc_not_zero(v)        atomic64_add_unless((v), 1LL, 0LL)
+
+#endif
+#endif
diff --git a/arch/arm64/include/asm/auxvec.h b/arch/arm64/include/asm/auxvec.h
new file mode 100644
index 00000000000..22d6d888585
--- /dev/null
+++ b/arch/arm64/include/asm/auxvec.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_AUXVEC_H
+#define __ASM_AUXVEC_H
+
+/* vDSO location */
+#define AT_SYSINFO_EHDR 33
+
+#endif
diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h
new file mode 100644
index 00000000000..d4a63338a53
--- /dev/null
+++ b/arch/arm64/include/asm/barrier.h
@@ -0,0 +1,52 @@
+/*
+ * Based on arch/arm/include/asm/barrier.h
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_BARRIER_H
+#define __ASM_BARRIER_H
+
+#ifndef __ASSEMBLY__
+
+#define sev()           asm volatile("sev" : : : "memory")
+#define wfe()           asm volatile("wfe" : : : "memory")
+#define wfi()           asm volatile("wfi" : : : "memory")
+
+#define isb()           asm volatile("isb" : : : "memory")
+#define dsb()           asm volatile("dsb sy" : : : "memory")
+
+#define mb()            dsb()
+#define rmb()           asm volatile("dsb ld" : : : "memory")
+#define wmb()           asm volatile("dsb st" : : : "memory")
+
+#ifndef CONFIG_SMP
+#define smp_mb()        barrier()
+#define smp_rmb()       barrier()
+#define smp_wmb()       barrier()
+#else
+#define smp_mb()        asm volatile("dmb ish" : : : "memory")
+#define smp_rmb()       asm volatile("dmb ishld" : : : "memory")
+#define smp_wmb()       asm volatile("dmb ishst" : : : "memory")
+#endif
+
+#define read_barrier_depends()          do { } while(0)
+#define smp_read_barrier_depends()      do { } while(0)
+
+#define set_mb(var, value)      do { var = value; smp_mb(); } while (0)
+#define nop()           asm volatile("nop");
+
+#endif  /* __ASSEMBLY__ */
+
+#endif  /* __ASM_BARRIER_H */
diff --git a/arch/arm64/include/asm/bitops.h b/arch/arm64/include/asm/bitops.h
new file mode 100644
index 00000000000..5e693073b03
--- /dev/null
+++ b/arch/arm64/include/asm/bitops.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_BITOPS_H
+#define __ASM_BITOPS_H
+
+#include <linux/compiler.h>
+
+#include <asm/barrier.h>
+
+/*
+ * clear_bit may not imply a memory barrier
+ */
+#ifndef smp_mb__before_clear_bit
+#define smp_mb__before_clear_bit()      smp_mb()
+#define smp_mb__after_clear_bit()       smp_mb()
+#endif
+
+#ifndef _LINUX_BITOPS_H
+#error only <linux/bitops.h> can be included directly
+#endif
+
+#include <asm-generic/bitops/builtin-__ffs.h>
+#include <asm-generic/bitops/builtin-ffs.h>
+#include <asm-generic/bitops/builtin-__fls.h>
+#include <asm-generic/bitops/builtin-fls.h>
+
+#include <asm-generic/bitops/ffz.h>
+#include <asm-generic/bitops/fls64.h>
+#include <asm-generic/bitops/find.h>
+
+#include <asm-generic/bitops/sched.h>
+#include <asm-generic/bitops/hweight.h>
+#include <asm-generic/bitops/lock.h>
+
+#include <asm-generic/bitops/atomic.h>
+#include <asm-generic/bitops/non-atomic.h>
+#include <asm-generic/bitops/le.h>
+#include <asm-generic/bitops/ext2-atomic.h>
+
+#endif /* __ASM_BITOPS_H */
diff --git a/arch/arm64/include/asm/bitsperlong.h b/arch/arm64/include/asm/bitsperlong.h
new file mode 100644
index 00000000000..fce9c2924fa
--- /dev/null
+++ b/arch/arm64/include/asm/bitsperlong.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_BITSPERLONG_H
+#define __ASM_BITSPERLONG_H
+
+#define __BITS_PER_LONG 64
+
+#include <asm-generic/bitsperlong.h>
+
+#endif  /* __ASM_BITSPERLONG_H */
diff --git a/arch/arm64/include/asm/byteorder.h b/arch/arm64/include/asm/byteorder.h
new file mode 100644
index 00000000000..2b92046aafc
--- /dev/null
+++ b/arch/arm64/include/asm/byteorder.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_BYTEORDER_H
+#define __ASM_BYTEORDER_H
+
+#include <linux/byteorder/little_endian.h>
+
+#endif  /* __ASM_BYTEORDER_H */
diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h
new file mode 100644
index 00000000000..390308a67f0
--- /dev/null
+++ b/arch/arm64/include/asm/cache.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_CACHE_H
+#define __ASM_CACHE_H
+
+#define L1_CACHE_SHIFT          6
+#define L1_CACHE_BYTES          (1 << L1_CACHE_SHIFT)
+
+/*
+ * Memory returned by kmalloc() may be used for DMA, so we must make
+ * sure that all such allocations are cache aligned. Otherwise,
+ * unrelated code may cause parts of the buffer to be read into the
+ * cache before the transfer is done, causing old data to be seen by
+ * the CPU.
+ */
+#define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
+#define ARCH_SLAB_MINALIGN      8
+
+#endif
diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
new file mode 100644
index 00000000000..aa3132ab7f2
--- /dev/null
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -0,0 +1,148 @@
+/*
+ * Based on arch/arm/include/asm/cacheflush.h
+ *
+ * Copyright (C) 1999-2002 Russell King.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_CACHEFLUSH_H
+#define __ASM_CACHEFLUSH_H
+
+#include <linux/mm.h>
+
+/*
+ * This flag is used to indicate that the page pointed to by a pte is clean
+ * and does not require cleaning before returning it to the user.
+ */
+#define PG_dcache_clean PG_arch_1
+
+/*
+ *      MM Cache Management
+ *      ===================
+ *
+ *      The arch/arm64/mm/cache.S implements these methods.
+ *
+ *      Start addresses are inclusive and end addresses are exclusive; start
+ *      addresses should be rounded down, end addresses up.
+ *
+ *      See Documentation/cachetlb.txt for more information. Please note that
+ *      the implementation assumes non-aliasing VIPT D-cache and (aliasing)
+ *      VIPT or ASID-tagged VIVT I-cache.
+ *
+ *      flush_cache_all()
+ *
+ *              Unconditionally clean and invalidate the entire cache.
+ *
+ *      flush_cache_mm(mm)
+ *
+ *              Clean and invalidate all user space cache entries
+ *              before a change of page tables.
+ *
+ *      flush_icache_range(start, end)
+ *
+ *              Ensure coherency between the I-cache and the D-cache in the
+ *              region described by start, end.
+ *              - start  - virtual start address
+ *              - end    - virtual end address
+ *
+ *      __flush_cache_user_range(start, end)
+ *
+ *              Ensure coherency between the I-cache and the D-cache in the
+ *              region described by start, end.
+ *              - start  - virtual start address
+ *              - end    - virtual end address
+ *
+ *      __flush_dcache_area(kaddr, size)
+ *
+ *              Ensure that the data held in page is written back.
+ *              - kaddr  - page address
+ *              - size   - region size
+ */
+extern void flush_cache_all(void);
+extern void flush_cache_mm(struct mm_struct *mm);
+extern void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
+extern void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn);
+extern void flush_icache_range(unsigned long start, unsigned long end);
+extern void __flush_dcache_area(void *addr, size_t len);
+extern void __flush_cache_user_range(unsigned long start, unsigned long end);
+
+/*
+ * Copy user data from/to a page which is mapped into a different
+ * processes address space.  Really, we want to allow our "user
+ * space" model to handle this.
+ */
+extern void copy_to_user_page(struct vm_area_struct *, struct page *,
+        unsigned long, void *, const void *, unsigned long);
+#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
+        do {                                                    \
+                memcpy(dst, src, len);                          \
+        } while (0)
+
+#define flush_cache_dup_mm(mm) flush_cache_mm(mm)
+
+/*
+ * flush_dcache_page is used when the kernel has written to the page
+ * cache page at virtual address page->virtual.
+ *
+ * If this page isn't mapped (ie, page_mapping == NULL), or it might
+ * have userspace mappings, then we _must_ always clean + invalidate
+ * the dcache entries associated with the kernel mapping.
+ *
+ * Otherwise we can defer the operation, and clean the cache when we are
+ * about to change to user space.  This is the same method as used on SPARC64.
+ * See update_mmu_cache for the user space part.
+ */
+#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
+extern void flush_dcache_page(struct page *);
+
+static inline void __flush_icache_all(void)
+{
+        asm("ic ialluis");
+}
+
+#define flush_dcache_mmap_lock(mapping) \
+        spin_lock_irq(&(mapping)->tree_lock)
+#define flush_dcache_mmap_unlock(mapping) \
+        spin_unlock_irq(&(mapping)->tree_lock)
+
+#define flush_icache_user_range(vma,page,addr,len) \
+        flush_dcache_page(page)
+
+/*
+ * We don't appear to need to do anything here.  In fact, if we did, we'd
+ * duplicate cache flushing elsewhere performed by flush_dcache_page().
+ */
+#define flush_icache_page(vma,page)     do { } while (0)
+
+/*
+ * flush_cache_vmap() is used when creating mappings (eg, via vmap,
+ * vmalloc, ioremap etc) in kernel space for pages.  On non-VIPT
+ * caches, since the direct-mappings of these pages may contain cached
+ * data, we need to do a full cache flush to ensure that writebacks
+ * don't corrupt data placed into these pages via the new mappings.
+ */
+static inline void flush_cache_vmap(unsigned long start, unsigned long end)
+{
+        /*
+         * set_pte_at() called from vmap_pte_range() does not
+         * have a DSB after cleaning the cache line.
+         */
+        dsb();
+}
+
+static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
+{
+}
+
+#endif
diff --git a/arch/arm64/include/asm/cachetype.h b/arch/arm64/include/asm/cachetype.h
new file mode 100644
index 00000000000..85f5f511352
--- /dev/null
+++ b/arch/arm64/include/asm/cachetype.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_CACHETYPE_H
+#define __ASM_CACHETYPE_H
+
+#include <asm/cputype.h>
+
+#define CTR_L1IP_SHIFT          14
+#define CTR_L1IP_MASK           3
+
+#define ICACHE_POLICY_RESERVED  0
+#define ICACHE_POLICY_AIVIVT    1
+#define ICACHE_POLICY_VIPT      2
+#define ICACHE_POLICY_PIPT      3
+
+static inline u32 icache_policy(void)
+{
+        return (read_cpuid_cachetype() >> CTR_L1IP_SHIFT) & CTR_L1IP_MASK;
+}
+
+/*
+ * Whilst the D-side always behaves as PIPT on AArch64, aliasing is
+ * permitted in the I-cache.
+ */
+static inline int icache_is_aliasing(void)
+{
+        return icache_policy() != ICACHE_POLICY_PIPT;
+}
+
+static inline int icache_is_aivivt(void)
+{
+        return icache_policy() == ICACHE_POLICY_AIVIVT;
+}
+
+#endif  /* __ASM_CACHETYPE_H */
diff --git a/arch/arm64/include/asm/cmpxchg.h b/arch/arm64/include/asm/cmpxchg.h
new file mode 100644
index 00000000000..e0e65b069d9
--- /dev/null
+++ b/arch/arm64/include/asm/cmpxchg.h
@@ -0,0 +1,173 @@
+/*
+ * Based on arch/arm/include/asm/cmpxchg.h
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_CMPXCHG_H
+#define __ASM_CMPXCHG_H
+
+#include <linux/bug.h>
+
+#include <asm/barrier.h>
+
+static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
+{
+        unsigned long ret, tmp;
+
+        switch (size) {
+        case 1:
+                asm volatile("//        __xchg1\n"
+                "1:     ldaxrb  %w0, [%3]\n"
+                "       stlxrb  %w1, %w2, [%3]\n"
+                "       cbnz    %w1, 1b\n"
+                        : "=&r" (ret), "=&r" (tmp)
+                        : "r" (x), "r" (ptr)
+                        : "memory", "cc");
+                break;
+        case 2:
+                asm volatile("//        __xchg2\n"
+                "1:     ldaxrh  %w0, [%3]\n"
+                "       stlxrh  %w1, %w2, [%3]\n"
+                "       cbnz    %w1, 1b\n"
+                        : "=&r" (ret), "=&r" (tmp)
+                        : "r" (x), "r" (ptr)
+                        : "memory", "cc");
+                break;
+        case 4:
+                asm volatile("//        __xchg4\n"
+                "1:     ldaxr   %w0, [%3]\n"
+                "       stlxr   %w1, %w2, [%3]\n"
+                "       cbnz    %w1, 1b\n"
+                        : "=&r" (ret), "=&r" (tmp)
+                        : "r" (x), "r" (ptr)
+                        : "memory", "cc");
+                break;
+        case 8:
+                asm volatile("//        __xchg8\n"
+                "1:     ldaxr   %0, [%3]\n"
+                "       stlxr   %w1, %2, [%3]\n"
+                "       cbnz    %w1, 1b\n"
+                        : "=&r" (ret), "=&r" (tmp)
+                        : "r" (x), "r" (ptr)
+                        : "memory", "cc");
+                break;
+        default:
+                BUILD_BUG();
+        }
+
+        return ret;
+}
+
+#define xchg(ptr,x) \
+        ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
+
+static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
+                                      unsigned long new, int size)
+{
+        unsigned long oldval = 0, res;
+
+        switch (size) {
+        case 1:
+                do {
+                        asm volatile("// __cmpxchg1\n"
+                        "       ldxrb   %w1, [%2]\n"
+                        "       mov     %w0, #0\n"
+                        "       cmp     %w1, %w3\n"
+                        "       b.ne    1f\n"
+                        "       stxrb   %w0, %w4, [%2]\n"
+                        "1:\n"
+                                : "=&r" (res), "=&r" (oldval)
+                                : "r" (ptr), "Ir" (old), "r" (new)
+                                : "cc");
+                } while (res);
+                break;
+
+        case 2:
+                do {
+                        asm volatile("// __cmpxchg2\n"
+                        "       ldxrh   %w1, [%2]\n"
+                        "       mov     %w0, #0\n"
+                        "       cmp     %w1, %w3\n"
+                        "       b.ne    1f\n"
+                        "       stxrh   %w0, %w4, [%2]\n"
+                        "1:\n"
+                                : "=&r" (res), "=&r" (oldval)
+                                : "r" (ptr), "Ir" (old), "r" (new)
+                                : "memory", "cc");
+                } while (res);
+                break;
+
+        case 4:
+                do {
+                        asm volatile("// __cmpxchg4\n"
+                        "       ldxr    %w1, [%2]\n"
+                        "       mov     %w0, #0\n"
+                        "       cmp     %w1, %w3\n"
+                        "       b.ne    1f\n"
+                        "       stxr    %w0, %w4, [%2]\n"
+                        "1:\n"
+                                : "=&r" (res), "=&r" (oldval)
+                                : "r" (ptr), "Ir" (old), "r" (new)
+                                : "cc");
+                } while (res);
+                break;
+
+        case 8:
+                do {
+                        asm volatile("// __cmpxchg8\n"
+                        "       ldxr    %1, [%2]\n"
+                        "       mov     %w0, #0\n"
+                        "       cmp     %1, %3\n"
+                        "       b.ne    1f\n"
+                        "       stxr    %w0, %4, [%2]\n"
+                        "1:\n"
+                                : "=&r" (res), "=&r" (oldval)
+                                : "r" (ptr), "Ir" (old), "r" (new)
+                                : "cc");
+                } while (res);
+                break;
+
+        default:
+                BUILD_BUG();
+        }
+
+        return oldval;
+}
+
+static inline unsigned long __cmpxchg_mb(volatile void *ptr, unsigned long old,
+                                         unsigned long new, int size)
+{
+        unsigned long ret;
+
+        smp_mb();
+        ret = __cmpxchg(ptr, old, new, size);
+        smp_mb();
+
+        return ret;
+}
+
+#define cmpxchg(ptr,o,n)                                                \
+        ((__typeof__(*(ptr)))__cmpxchg_mb((ptr),                        \
+                                          (unsigned long)(o),           \
+                                          (unsigned long)(n),           \
+                                          sizeof(*(ptr))))
+
+#define cmpxchg_local(ptr,o,n)                                          \
+        ((__typeof__(*(ptr)))__cmpxchg((ptr),                           \
+                                       (unsigned long)(o),              \
+                                       (unsigned long)(n),              \
+                                       sizeof(*(ptr))))
+
+#endif  /* __ASM_CMPXCHG_H */
diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h
new file mode 100644
index 00000000000..a670a33ad73
--- /dev/null
+++ b/arch/arm64/include/asm/compat.h
@@ -0,0 +1,242 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_COMPAT_H
+#define __ASM_COMPAT_H
+#ifdef __KERNEL__
+#ifdef CONFIG_COMPAT
+
+/*
+ * Architecture specific compatibility types
+ */
+#include <linux/types.h>
+#include <linux/sched.h>
+
+#define COMPAT_USER_HZ          100
+#define COMPAT_UTS_MACHINE      "armv8l\0\0"
+
+typedef u32             compat_size_t;
+typedef s32             compat_ssize_t;
+typedef s32             compat_time_t;
+typedef s32             compat_clock_t;
+typedef s32             compat_pid_t;
+typedef u32             __compat_uid_t;
+typedef u32             __compat_gid_t;
+typedef u32             __compat_uid32_t;
+typedef u32             __compat_gid32_t;
+typedef u32             compat_mode_t;
+typedef u32             compat_ino_t;
+typedef u32             compat_dev_t;
+typedef s32             compat_off_t;
+typedef s64             compat_loff_t;
+typedef s16             compat_nlink_t;
+typedef u16             compat_ipc_pid_t;
+typedef s32             compat_daddr_t;
+typedef u32             compat_caddr_t;
+typedef __kernel_fsid_t compat_fsid_t;
+typedef s32             compat_key_t;
+typedef s32             compat_timer_t;
+
+typedef s32             compat_int_t;
+typedef s32             compat_long_t;
+typedef s64             compat_s64;
+typedef u32             compat_uint_t;
+typedef u32             compat_ulong_t;
+typedef u64             compat_u64;
+
+struct compat_timespec {
+        compat_time_t   tv_sec;
+        s32             tv_nsec;
+};
+
+struct compat_timeval {
+        compat_time_t   tv_sec;
+        s32             tv_usec;
+};
+
+struct compat_stat {
+        compat_dev_t    st_dev;
+        compat_ino_t    st_ino;
+        compat_mode_t   st_mode;
+        compat_nlink_t  st_nlink;
+        __compat_uid32_t        st_uid;
+        __compat_gid32_t        st_gid;
+        compat_dev_t    st_rdev;
+        compat_off_t    st_size;
+        compat_off_t    st_blksize;
+        compat_off_t    st_blocks;
+        compat_time_t   st_atime;
+        u32             st_atime_nsec;
+        compat_time_t   st_mtime;
+        u32             st_mtime_nsec;
+        compat_time_t   st_ctime;
+        u32             st_ctime_nsec;
+        u32             __unused4[2];
+};
+
+struct compat_flock {
+        short           l_type;
+        short           l_whence;
+        compat_off_t    l_start;
+        compat_off_t    l_len;
+        compat_pid_t    l_pid;
+};
+
+#define F_GETLK64       12      /*  using 'struct flock64' */
+#define F_SETLK64       13
+#define F_SETLKW64      14
+
+struct compat_flock64 {
+        short           l_type;
+        short           l_whence;
+        compat_loff_t   l_start;
+        compat_loff_t   l_len;
+        compat_pid_t    l_pid;
+};
+
+struct compat_statfs {
+        int             f_type;
+        int             f_bsize;
+        int             f_blocks;
+        int             f_bfree;
+        int             f_bavail;
+        int             f_files;
+        int             f_ffree;
+        compat_fsid_t   f_fsid;
+        int             f_namelen;      /* SunOS ignores this field. */
+        int             f_frsize;
+        int             f_flags;
+        int             f_spare[4];
+};
+
+#define COMPAT_RLIM_INFINITY            0xffffffff
+
+typedef u32             compat_old_sigset_t;
+
+#define _COMPAT_NSIG            64
+#define _COMPAT_NSIG_BPW        32
+
+typedef u32             compat_sigset_word;
+
+#define COMPAT_OFF_T_MAX        0x7fffffff
+#define COMPAT_LOFF_T_MAX       0x7fffffffffffffffL
+
+/*
+ * A pointer passed in from user mode. This should not
+ * be used for syscall parameters, just declare them
+ * as pointers because the syscall entry code will have
+ * appropriately converted them already.
+ */
+typedef u32             compat_uptr_t;
+
+static inline void __user *compat_ptr(compat_uptr_t uptr)
+{
+        return (void __user *)(unsigned long)uptr;
+}
+
+static inline compat_uptr_t ptr_to_compat(void __user *uptr)
+{
+        return (u32)(unsigned long)uptr;
+}
+
+static inline void __user *arch_compat_alloc_user_space(long len)
+{
+        struct pt_regs *regs = task_pt_regs(current);
+        return (void __user *)regs->compat_sp - len;
+}
+
+struct compat_ipc64_perm {
+        compat_key_t key;
+        __compat_uid32_t uid;
+        __compat_gid32_t gid;
+        __compat_uid32_t cuid;
+        __compat_gid32_t cgid;
+        unsigned short mode;
+        unsigned short __pad1;
+        unsigned short seq;
+        unsigned short __pad2;
+        compat_ulong_t unused1;
+        compat_ulong_t unused2;
+};
+
+struct compat_semid64_ds {
+        struct compat_ipc64_perm sem_perm;
+        compat_time_t  sem_otime;
+        compat_ulong_t __unused1;
+        compat_time_t  sem_ctime;
+        compat_ulong_t __unused2;
+        compat_ulong_t sem_nsems;
+        compat_ulong_t __unused3;
+        compat_ulong_t __unused4;
+};
+
+struct compat_msqid64_ds {
+        struct compat_ipc64_perm msg_perm;
+        compat_time_t  msg_stime;
+        compat_ulong_t __unused1;
+        compat_time_t  msg_rtime;
+        compat_ulong_t __unused2;
+        compat_time_t  msg_ctime;
+        compat_ulong_t __unused3;
+        compat_ulong_t msg_cbytes;
+        compat_ulong_t msg_qnum;
+        compat_ulong_t msg_qbytes;
+        compat_pid_t   msg_lspid;
+        compat_pid_t   msg_lrpid;
+        compat_ulong_t __unused4;
+        compat_ulong_t __unused5;
+};
+
+struct compat_shmid64_ds {
+        struct compat_ipc64_perm shm_perm;
+        compat_size_t  shm_segsz;
+        compat_time_t  shm_atime;
+        compat_ulong_t __unused1;
+        compat_time_t  shm_dtime;
+        compat_ulong_t __unused2;
+        compat_time_t  shm_ctime;
+        compat_ulong_t __unused3;
+        compat_pid_t   shm_cpid;
+        compat_pid_t   shm_lpid;
+        compat_ulong_t shm_nattch;
+        compat_ulong_t __unused4;
+        compat_ulong_t __unused5;
+};
+
+static inline int is_compat_task(void)
+{
+        return test_thread_flag(TIF_32BIT);
+}
+
+static inline int is_compat_thread(struct thread_info *thread)
+{
+        return test_ti_thread_flag(thread, TIF_32BIT);
+}
+
+#else /* !CONFIG_COMPAT */
+
+static inline int is_compat_task(void)
+{
+        return 0;
+}
+
+static inline int is_compat_thread(struct thread_info *thread)
+{
+        return 0;
+}
+
+#endif /* CONFIG_COMPAT */
+#endif /* __KERNEL__ */
+#endif /* __ASM_COMPAT_H */
diff --git a/arch/arm64/include/asm/compiler.h b/arch/arm64/include/asm/compiler.h
new file mode 100644
index 00000000000..ee35fd0f223
--- /dev/null
+++ b/arch/arm64/include/asm/compiler.h
@@ -0,0 +1,30 @@
+/*
+ * Based on arch/arm/include/asm/compiler.h
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_COMPILER_H
+#define __ASM_COMPILER_H
+
+/*
+ * This is used to ensure the compiler did actually allocate the register we
+ * asked it for some inline assembly sequences.  Apparently we can't trust the
+ * compiler from one version to another so a bit of paranoia won't hurt.  This
+ * string is meant to be concatenated with the inline asm string and will
+ * cause compilation to stop on mismatch.  (for details, see gcc PR 15089)
+ */
+#define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"
+
+#endif  /* __ASM_COMPILER_H */
diff --git a/arch/arm64/include/asm/cputable.h b/arch/arm64/include/asm/cputable.h
new file mode 100644
index 00000000000..e3bd983d366
--- /dev/null
+++ b/arch/arm64/include/asm/cputable.h
@@ -0,0 +1,30 @@
+/*
+ * arch/arm64/include/asm/cputable.h
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_CPUTABLE_H
+#define __ASM_CPUTABLE_H
+
+struct cpu_info {
+        unsigned int    cpu_id_val;
+        unsigned int    cpu_id_mask;
+        const char      *cpu_name;
+        unsigned long   (*cpu_setup)(void);
+};
+
+extern struct cpu_info *lookup_processor_type(unsigned int);
+
+#endif
diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
new file mode 100644
index 00000000000..ef54125e6c1
--- /dev/null
+++ b/arch/arm64/include/asm/cputype.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_CPUTYPE_H
+#define __ASM_CPUTYPE_H
+
+#define ID_MIDR_EL1             "midr_el1"
+#define ID_CTR_EL0              "ctr_el0"
+
+#define ID_AA64PFR0_EL1         "id_aa64pfr0_el1"
+#define ID_AA64DFR0_EL1         "id_aa64dfr0_el1"
+#define ID_AA64AFR0_EL1         "id_aa64afr0_el1"
+#define ID_AA64ISAR0_EL1        "id_aa64isar0_el1"
+#define ID_AA64MMFR0_EL1        "id_aa64mmfr0_el1"
+
+#define read_cpuid(reg) ({                                              \
+        u64 __val;                                                      \
+        asm("mrs        %0, " reg : "=r" (__val));                      \
+        __val;                                                          \
+})
+
+/*
+ * The CPU ID never changes at run time, so we might as well tell the
+ * compiler that it's constant.  Use this function to read the CPU ID
+ * rather than directly reading processor_id or read_cpuid() directly.
+ */
+static inline u32 __attribute_const__ read_cpuid_id(void)
+{
+        return read_cpuid(ID_MIDR_EL1);
+}
+
+static inline u32 __attribute_const__ read_cpuid_cachetype(void)
+{
+        return read_cpuid(ID_CTR_EL0);
+}
+
+#endif
diff --git a/arch/arm64/include/asm/debug-monitors.h b/arch/arm64/include/asm/debug-monitors.h
new file mode 100644
index 00000000000..7eaa0b30249
--- /dev/null
+++ b/arch/arm64/include/asm/debug-monitors.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_DEBUG_MONITORS_H
+#define __ASM_DEBUG_MONITORS_H
+
+#ifdef __KERNEL__
+
+#define DBG_ESR_EVT(x)          (((x) >> 27) & 0x7)
+
+/* AArch64 */
+#define DBG_ESR_EVT_HWBP        0x0
+#define DBG_ESR_EVT_HWSS        0x1
+#define DBG_ESR_EVT_HWWP        0x2
+#define DBG_ESR_EVT_BRK         0x6
+
+enum debug_el {
+        DBG_ACTIVE_EL0 = 0,
+        DBG_ACTIVE_EL1,
+};
+
+/* AArch32 */
+#define DBG_ESR_EVT_BKPT        0x4
+#define DBG_ESR_EVT_VECC        0x5
+
+#define AARCH32_BREAK_ARM       0x07f001f0
+#define AARCH32_BREAK_THUMB     0xde01
+#define AARCH32_BREAK_THUMB2_LO 0xf7f0
+#define AARCH32_BREAK_THUMB2_HI 0xa000
+
+#ifndef __ASSEMBLY__
+struct task_struct;
+
+#define local_dbg_save(flags)                                                   \
+        do {                                                                    \
+                typecheck(unsigned long, flags);                                \
+                asm volatile(                                                   \
+                "mrs    %0, daif                        // local_dbg_save\n"    \
+                "msr    daifset, #8"                                            \
+                : "=r" (flags) : : "memory");                                   \
+        } while (0)
+
+#define local_dbg_restore(flags)                                                \
+        do {                                                                    \
+                typecheck(unsigned long, flags);                                \
+                asm volatile(                                                   \
+                "msr    daif, %0                        // local_dbg_restore\n" \
+                : : "r" (flags) : "memory");                                    \
+        } while (0)
+
+#define DBG_ARCH_ID_RESERVED    0       /* In case of ptrace ABI updates. */
+
+u8 debug_monitors_arch(void);
+
+void enable_debug_monitors(enum debug_el el);
+void disable_debug_monitors(enum debug_el el);
+
+void user_rewind_single_step(struct task_struct *task);
+void user_fastforward_single_step(struct task_struct *task);
+
+void kernel_enable_single_step(struct pt_regs *regs);
+void kernel_disable_single_step(void);
+int kernel_active_single_step(void);
+
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+int reinstall_suspended_bps(struct pt_regs *regs);
+#else
+static inline int reinstall_suspended_bps(struct pt_regs *regs)
+{
+        return -ENODEV;
+}
+#endif
+
+#endif  /* __ASSEMBLY */
+#endif  /* __KERNEL__ */
+#endif  /* __ASM_DEBUG_MONITORS_H */
diff --git a/arch/arm64/include/asm/device.h b/arch/arm64/include/asm/device.h
new file mode 100644
index 00000000000..0d8453c755a
--- /dev/null
+++ b/arch/arm64/include/asm/device.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_DEVICE_H
+#define __ASM_DEVICE_H
+
+struct dev_archdata {
+        struct dma_map_ops *dma_ops;
+};
+
+struct pdev_archdata {
+};
+
+#endif
diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
new file mode 100644
index 00000000000..538f4b44db5
--- /dev/null
+++ b/arch/arm64/include/asm/dma-mapping.h
@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_DMA_MAPPING_H
+#define __ASM_DMA_MAPPING_H
+
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <linux/vmalloc.h>
+
+#include <asm-generic/dma-coherent.h>
+
+#define ARCH_HAS_DMA_GET_REQUIRED_MASK
+
+extern struct dma_map_ops *dma_ops;
+
+static inline struct dma_map_ops *get_dma_ops(struct device *dev)
+{
+        if (unlikely(!dev) || !dev->archdata.dma_ops)
+                return dma_ops;
+        else
+                return dev->archdata.dma_ops;
+}
+
+#include <asm-generic/dma-mapping-common.h>
+
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+        return (dma_addr_t)paddr;
+}
+
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
+{
+        return (phys_addr_t)dev_addr;
+}
+
+static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
+{
+        struct dma_map_ops *ops = get_dma_ops(dev);
+        return ops->mapping_error(dev, dev_addr);
+}
+
+static inline int dma_supported(struct device *dev, u64 mask)
+{
+        struct dma_map_ops *ops = get_dma_ops(dev);
+        return ops->dma_supported(dev, mask);
+}
+
+static inline int dma_set_mask(struct device *dev, u64 mask)
+{
+        if (!dev->dma_mask || !dma_supported(dev, mask))
+                return -EIO;
+        *dev->dma_mask = mask;
+
+        return 0;
+}
+
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+        if (!dev->dma_mask)
+                return 0;
+
+        return addr + size - 1 <= *dev->dma_mask;
+}
+
+static inline void dma_mark_clean(void *addr, size_t size)
+{
+}
+
+static inline void *dma_alloc_coherent(struct device *dev, size_t size,
+                                       dma_addr_t *dma_handle, gfp_t flags)
+{
+        struct dma_map_ops *ops = get_dma_ops(dev);
+        void *vaddr;
+
+        if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr))
+                return vaddr;
+
+        vaddr = ops->alloc(dev, size, dma_handle, flags, NULL);
+        debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
+        return vaddr;
+}
+
+static inline void dma_free_coherent(struct device *dev, size_t size,
+                                     void *vaddr, dma_addr_t dev_addr)
+{
+        struct dma_map_ops *ops = get_dma_ops(dev);
+
+        if (dma_release_from_coherent(dev, get_order(size), vaddr))
+                return;
+
+        debug_dma_free_coherent(dev, size, vaddr, dev_addr);
+        ops->free(dev, size, vaddr, dev_addr, NULL);
+}
+
+/*
+ * There is no dma_cache_sync() implementation, so just return NULL here.
+ */
+static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
+                                          dma_addr_t *handle, gfp_t flags)
+{
+        return NULL;
+}
+
+static inline void dma_free_noncoherent(struct device *dev, size_t size,
+                                        void *cpu_addr, dma_addr_t handle)
+{
+}
+
+#endif  /* __KERNEL__ */
+#endif  /* __ASM_DMA_MAPPING_H */
diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h
new file mode 100644
index 00000000000..cf284649dfc
--- /dev/null
+++ b/arch/arm64/include/asm/elf.h
@@ -0,0 +1,179 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_ELF_H
+#define __ASM_ELF_H
+
+#include <asm/hwcap.h>
+
+/*
+ * ELF register definitions..
+ */
+#include <asm/ptrace.h>
+#include <asm/user.h>
+
+typedef unsigned long elf_greg_t;
+typedef unsigned long elf_freg_t[3];
+
+#define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+typedef struct user_fp elf_fpregset_t;
+
+#define EM_AARCH64              183
+
+/*
+ * AArch64 static relocation types.
+ */
+
+/* Miscellaneous. */
+#define R_ARM_NONE                      0
+#define R_AARCH64_NONE                  256
+
+/* Data. */
+#define R_AARCH64_ABS64                 257
+#define R_AARCH64_ABS32                 258
+#define R_AARCH64_ABS16                 259
+#define R_AARCH64_PREL64                260
+#define R_AARCH64_PREL32                261
+#define R_AARCH64_PREL16                262
+
+/* Instructions. */
+#define R_AARCH64_MOVW_UABS_G0          263
+#define R_AARCH64_MOVW_UABS_G0_NC       264
+#define R_AARCH64_MOVW_UABS_G1          265
+#define R_AARCH64_MOVW_UABS_G1_NC       266
+#define R_AARCH64_MOVW_UABS_G2          267
+#define R_AARCH64_MOVW_UABS_G2_NC       268
+#define R_AARCH64_MOVW_UABS_G3          269
+
+#define R_AARCH64_MOVW_SABS_G0          270
+#define R_AARCH64_MOVW_SABS_G1          271
+#define R_AARCH64_MOVW_SABS_G2          272
+
+#define R_AARCH64_LD_PREL_LO19          273
+#define R_AARCH64_ADR_PREL_LO21         274
+#define R_AARCH64_ADR_PREL_PG_HI21      275
+#define R_AARCH64_ADR_PREL_PG_HI21_NC   276
+#define R_AARCH64_ADD_ABS_LO12_NC       277
+#define R_AARCH64_LDST8_ABS_LO12_NC     278
+
+#define R_AARCH64_TSTBR14               279
+#define R_AARCH64_CONDBR19              280
+#define R_AARCH64_JUMP26                282
+#define R_AARCH64_CALL26                283
+#define R_AARCH64_LDST16_ABS_LO12_NC    284
+#define R_AARCH64_LDST32_ABS_LO12_NC    285
+#define R_AARCH64_LDST64_ABS_LO12_NC    286
+#define R_AARCH64_LDST128_ABS_LO12_NC   299
+
+#define R_AARCH64_MOVW_PREL_G0          287
+#define R_AARCH64_MOVW_PREL_G0_NC       288
+#define R_AARCH64_MOVW_PREL_G1          289
+#define R_AARCH64_MOVW_PREL_G1_NC       290
+#define R_AARCH64_MOVW_PREL_G2          291
+#define R_AARCH64_MOVW_PREL_G2_NC       292
+#define R_AARCH64_MOVW_PREL_G3          293
+
+
+/*
+ * These are used to set parameters in the core dumps.
+ */
+#define ELF_CLASS       ELFCLASS64
+#define ELF_DATA        ELFDATA2LSB
+#define ELF_ARCH        EM_AARCH64
+
+#define ELF_PLATFORM_SIZE       16
+#define ELF_PLATFORM            ("aarch64")
+
+/*
+ * This is used to ensure we don't load something for the wrong architecture.
+ */
+#define elf_check_arch(x)               ((x)->e_machine == EM_AARCH64)
+
+#define elf_read_implies_exec(ex,stk)   (stk != EXSTACK_DISABLE_X)
+
+#define CORE_DUMP_USE_REGSET
+#define ELF_EXEC_PAGESIZE       PAGE_SIZE
+
+/*
+ * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
+ * use of this is to invoke "./ld.so someprog" to test out a new version of
+ * the loader.  We need to make sure that it is out of the way of the program
+ * that it will "exec", and that there is sufficient room for the brk.
+ */
+extern unsigned long randomize_et_dyn(unsigned long base);
+#define ELF_ET_DYN_BASE (randomize_et_dyn(2 * TASK_SIZE_64 / 3))
+
+/*
+ * When the program starts, a1 contains a pointer to a function to be
+ * registered with atexit, as per the SVR4 ABI.  A value of 0 means we have no
+ * such handler.
+ */
+#define ELF_PLAT_INIT(_r, load_addr)    (_r)->regs[0] = 0
+
+#define SET_PERSONALITY(ex)             clear_thread_flag(TIF_32BIT);
+
+#define ARCH_DLINFO                                                     \
+do {                                                                    \
+        NEW_AUX_ENT(AT_SYSINFO_EHDR,                                    \
+                    (elf_addr_t)current->mm->context.vdso);             \
+} while (0)
+
+#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
+struct linux_binprm;
+extern int arch_setup_additional_pages(struct linux_binprm *bprm,
+                                       int uses_interp);
+
+/* 1GB of VA */
+#ifdef CONFIG_COMPAT
+#define STACK_RND_MASK                  (test_thread_flag(TIF_32BIT) ? \
+                                                0x7ff >> (PAGE_SHIFT - 12) : \
+                                                0x3ffff >> (PAGE_SHIFT - 12))
+#else
+#define STACK_RND_MASK                  (0x3ffff >> (PAGE_SHIFT - 12))
+#endif
+
+struct mm_struct;
+extern unsigned long arch_randomize_brk(struct mm_struct *mm);
+#define arch_randomize_brk arch_randomize_brk
+
+#ifdef CONFIG_COMPAT
+#define EM_ARM                          40
+#define COMPAT_ELF_PLATFORM             ("v8l")
+
+#define COMPAT_ELF_ET_DYN_BASE          (randomize_et_dyn(2 * TASK_SIZE_32 / 3))
+
+/* AArch32 registers. */
+#define COMPAT_ELF_NGREG                18
+typedef unsigned int                    compat_elf_greg_t;
+typedef compat_elf_greg_t               compat_elf_gregset_t[COMPAT_ELF_NGREG];
+
+/* AArch32 EABI. */
+#define EF_ARM_EABI_MASK                0xff000000
+#define compat_elf_check_arch(x)        (((x)->e_machine == EM_ARM) && \
+                                         ((x)->e_flags & EF_ARM_EABI_MASK))
+
+#define compat_start_thread             compat_start_thread
+#define COMPAT_SET_PERSONALITY(ex)      set_thread_flag(TIF_32BIT);
+#define COMPAT_ARCH_DLINFO
+extern int aarch32_setup_vectors_page(struct linux_binprm *bprm,
+                                      int uses_interp);
+#define compat_arch_setup_additional_pages \
+                                        aarch32_setup_vectors_page
+
+#endif /* CONFIG_COMPAT */
+
+#endif
diff --git a/arch/arm64/include/asm/exception.h b/arch/arm64/include/asm/exception.h
new file mode 100644
index 00000000000..ac63519b7b9
--- /dev/null
+++ b/arch/arm64/include/asm/exception.h
@@ -0,0 +1,23 @@
+/*
+ * Based on arch/arm/include/asm/exception.h
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_EXCEPTION_H
+#define __ASM_EXCEPTION_H
+
+#define __exception     __attribute__((section(".exception.text")))
+
+#endif  /* __ASM_EXCEPTION_H */
diff --git a/arch/arm64/include/asm/exec.h b/arch/arm64/include/asm/exec.h
new file mode 100644
index 00000000000..db0563c2348
--- /dev/null
+++ b/arch/arm64/include/asm/exec.h
@@ -0,0 +1,23 @@
+/*
+ * Based on arch/arm/include/asm/exec.h
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_EXEC_H
+#define __ASM_EXEC_H
+
+extern unsigned long arch_align_stack(unsigned long sp);
+
+#endif  /* __ASM_EXEC_H */
diff --git a/arch/arm64/include/asm/fb.h b/arch/arm64/include/asm/fb.h
new file mode 100644
index 00000000000..adb88a64b2f
--- /dev/null
+++ b/arch/arm64/include/asm/fb.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_FB_H_
+#define __ASM_FB_H_
+
+#include <linux/fb.h>
+#include <linux/fs.h>
+#include <asm/page.h>
+
+static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
+                                unsigned long off)
+{
+        vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+}
+
+static inline int fb_is_primary_device(struct fb_info *info)
+{
+        return 0;
+}
+
+#endif /* __ASM_FB_H_ */
diff --git a/arch/arm64/include/asm/fcntl.h b/arch/arm64/include/asm/fcntl.h
new file mode 100644
index 00000000000..cd2e630c235
--- /dev/null
+++ b/arch/arm64/include/asm/fcntl.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_FCNTL_H
+#define __ASM_FCNTL_H
+
+/*
+ * Using our own definitions for AArch32 (compat) support.
+ */
+#define O_DIRECTORY      040000 /* must be a directory */
+#define O_NOFOLLOW      0100000 /* don't follow links */
+#define O_DIRECT        0200000 /* direct disk access hint - currently ignored */
+#define O_LARGEFILE     0400000
+
+#include <asm-generic/fcntl.h>
+
+#endif
diff --git a/arch/arm64/include/asm/fpsimd.h b/arch/arm64/include/asm/fpsimd.h
new file mode 100644
index 00000000000..b42fab9f62a
--- /dev/null
+++ b/arch/arm64/include/asm/fpsimd.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_FP_H
+#define __ASM_FP_H
+
+#include <asm/ptrace.h>
+
+#ifndef __ASSEMBLY__
+
+/*
+ * FP/SIMD storage area has:
+ *  - FPSR and FPCR
+ *  - 32 128-bit data registers
+ *
+ * Note that user_fp forms a prefix of this structure, which is relied
+ * upon in the ptrace FP/SIMD accessors. struct user_fpsimd_state must
+ * form a prefix of struct fpsimd_state.
+ */
+struct fpsimd_state {
+        union {
+                struct user_fpsimd_state user_fpsimd;
+                struct {
+                        __uint128_t vregs[32];
+                        u32 fpsr;
+                        u32 fpcr;
+                };
+        };
+};
+
+#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
+/* Masks for extracting the FPSR and FPCR from the FPSCR */
+#define VFP_FPSCR_STAT_MASK     0xf800009f
+#define VFP_FPSCR_CTRL_MASK     0x07f79f00
+/*
+ * The VFP state has 32x64-bit registers and a single 32-bit
+ * control/status register.
+ */
+#define VFP_STATE_SIZE          ((32 * 8) + 4)
+#endif
+
+struct task_struct;
+
+extern void fpsimd_save_state(struct fpsimd_state *state);
+extern void fpsimd_load_state(struct fpsimd_state *state);
+
+extern void fpsimd_thread_switch(struct task_struct *next);
+extern void fpsimd_flush_thread(void);
+
+#endif
+
+#endif
diff --git a/arch/arm64/include/asm/futex.h b/arch/arm64/include/asm/futex.h
new file mode 100644
index 00000000000..3468ae8439f
--- /dev/null
+++ b/arch/arm64/include/asm/futex.h
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_FUTEX_H
+#define __ASM_FUTEX_H
+
+#ifdef __KERNEL__
+
+#include <linux/futex.h>
+#include <linux/uaccess.h>
+#include <asm/errno.h>
+
+#define __futex_atomic_op(insn, ret, oldval, uaddr, tmp, oparg)         \
+        asm volatile(                                                   \
+"1:     ldaxr   %w1, %2\n"                                              \
+        insn "\n"                                                       \
+"2:     stlxr   %w3, %w0, %2\n"                                         \
+"       cbnz    %w3, 1b\n"                                              \
+"3:\n"                                                                  \
+"       .pushsection .fixup,\"ax\"\n"                                   \
+"4:     mov     %w0, %w5\n"                                             \
+"       b       3b\n"                                                   \
+"       .popsection\n"                                                  \
+"       .pushsection __ex_table,\"a\"\n"                                \
+"       .align  3\n"                                                    \
+"       .quad   1b, 4b, 2b, 4b\n"                                       \
+"       .popsection\n"                                                  \
+        : "=&r" (ret), "=&r" (oldval), "+Q" (*uaddr), "=&r" (tmp)       \
+        : "r" (oparg), "Ir" (-EFAULT)                                   \
+        : "cc")
+
+static inline int
+futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
+{
+        int op = (encoded_op >> 28) & 7;
+        int cmp = (encoded_op >> 24) & 15;
+        int oparg = (encoded_op << 8) >> 20;
+        int cmparg = (encoded_op << 20) >> 20;
+        int oldval = 0, ret, tmp;
+
+        if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
+                oparg = 1 << oparg;
+
+        if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
+                return -EFAULT;
+
+        pagefault_disable();    /* implies preempt_disable() */
+
+        switch (op) {
+        case FUTEX_OP_SET:
+                __futex_atomic_op("mov  %w0, %w4",
+                                  ret, oldval, uaddr, tmp, oparg);
+                break;
+        case FUTEX_OP_ADD:
+                __futex_atomic_op("add  %w0, %w1, %w4",
+                                  ret, oldval, uaddr, tmp, oparg);
+                break;
+        case FUTEX_OP_OR:
+                __futex_atomic_op("orr  %w0, %w1, %w4",
+                                  ret, oldval, uaddr, tmp, oparg);
+                break;
+        case FUTEX_OP_ANDN:
+                __futex_atomic_op("and  %w0, %w1, %w4",
+                                  ret, oldval, uaddr, tmp, ~oparg);
+                break;
+        case FUTEX_OP_XOR:
+                __futex_atomic_op("eor  %w0, %w1, %w4",
+                                  ret, oldval, uaddr, tmp, oparg);
+                break;
+        default:
+                ret = -ENOSYS;
+        }
+
+        pagefault_enable();     /* subsumes preempt_enable() */
+
+        if (!ret) {
+                switch (cmp) {
+                case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
+                case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
+                case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
+                case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
+                case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
+                case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
+                default: ret = -ENOSYS;
+                }
+        }
+        return ret;
+}
+
+static inline int
+futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
+                              u32 oldval, u32 newval)
+{
+        int ret = 0;
+        u32 val, tmp;
+
+        if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
+                return -EFAULT;
+
+        asm volatile("// futex_atomic_cmpxchg_inatomic\n"
+"1:     ldaxr   %w1, %2\n"
+"       sub     %w3, %w1, %w4\n"
+"       cbnz    %w3, 3f\n"
+"2:     stlxr   %w3, %w5, %2\n"
+"       cbnz    %w3, 1b\n"
+"3:\n"
+"       .pushsection .fixup,\"ax\"\n"
+"4:     mov     %w0, %w6\n"
+"       b       3b\n"
+"       .popsection\n"
+"       .pushsection __ex_table,\"a\"\n"
+"       .align  3\n"
+"       .quad   1b, 4b, 2b, 4b\n"
+"       .popsection\n"
+        : "+r" (ret), "=&r" (val), "+Q" (*uaddr), "=&r" (tmp)
+        : "r" (oldval), "r" (newval), "Ir" (-EFAULT)
+        : "cc", "memory");
+
+        *uval = val;
+        return ret;
+}
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_FUTEX_H */
diff --git a/arch/arm64/include/asm/hardirq.h b/arch/arm64/include/asm/hardirq.h
new file mode 100644
index 00000000000..507546353d6
--- /dev/null
+++ b/arch/arm64/include/asm/hardirq.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_HARDIRQ_H
+#define __ASM_HARDIRQ_H
+
+#include <linux/cache.h>
+#include <linux/threads.h>
+#include <asm/irq.h>
+
+#define NR_IPI  4
+
+typedef struct {
+        unsigned int __softirq_pending;
+#ifdef CONFIG_SMP
+        unsigned int ipi_irqs[NR_IPI];
+#endif
+} ____cacheline_aligned irq_cpustat_t;
+
+#include <linux/irq_cpustat.h>  /* Standard mappings for irq_cpustat_t above */
+
+#define __inc_irq_stat(cpu, member)     __IRQ_STAT(cpu, member)++
+#define __get_irq_stat(cpu, member)     __IRQ_STAT(cpu, member)
+
+#ifdef CONFIG_SMP
+u64 smp_irq_stat_cpu(unsigned int cpu);
+#define arch_irq_stat_cpu       smp_irq_stat_cpu
+#endif
+
+#define __ARCH_IRQ_EXIT_IRQS_DISABLED   1
+
+static inline void ack_bad_irq(unsigned int irq)
+{
+        extern unsigned long irq_err_count;
+        irq_err_count++;
+}
+
+extern void handle_IRQ(unsigned int, struct pt_regs *);
+
+#endif /* __ASM_HARDIRQ_H */
diff --git a/arch/arm64/include/asm/hw_breakpoint.h b/arch/arm64/include/asm/hw_breakpoint.h
new file mode 100644
index 00000000000..d064047612b
--- /dev/null
+++ b/arch/arm64/include/asm/hw_breakpoint.h
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_HW_BREAKPOINT_H
+#define __ASM_HW_BREAKPOINT_H
+
+#ifdef __KERNEL__
+
+struct arch_hw_breakpoint_ctrl {
+        u32 __reserved  : 19,
+        len             : 8,
+        type            : 2,
+        privilege       : 2,
+        enabled         : 1;
+};
+
+struct arch_hw_breakpoint {
+        u64 address;
+        u64 trigger;
+        struct arch_hw_breakpoint_ctrl ctrl;
+};
+
+static inline u32 encode_ctrl_reg(struct arch_hw_breakpoint_ctrl ctrl)
+{
+        return (ctrl.len << 5) | (ctrl.type << 3) | (ctrl.privilege << 1) |
+                ctrl.enabled;
+}
+
+static inline void decode_ctrl_reg(u32 reg,
+                                   struct arch_hw_breakpoint_ctrl *ctrl)
+{
+        ctrl->enabled   = reg & 0x1;
+        reg >>= 1;
+        ctrl->privilege = reg & 0x3;
+        reg >>= 2;
+        ctrl->type      = reg & 0x3;
+        reg >>= 2;
+        ctrl->len       = reg & 0xff;
+}
+
+/* Breakpoint */
+#define ARM_BREAKPOINT_EXECUTE  0
+
+/* Watchpoints */
+#define ARM_BREAKPOINT_LOAD     1
+#define ARM_BREAKPOINT_STORE    2
+#define AARCH64_ESR_ACCESS_MASK (1 << 6)
+
+/* Privilege Levels */
+#define AARCH64_BREAKPOINT_EL1  1
+#define AARCH64_BREAKPOINT_EL0  2
+
+/* Lengths */
+#define ARM_BREAKPOINT_LEN_1    0x1
+#define ARM_BREAKPOINT_LEN_2    0x3
+#define ARM_BREAKPOINT_LEN_4    0xf
+#define ARM_BREAKPOINT_LEN_8    0xff
+
+/* Kernel stepping */
+#define ARM_KERNEL_STEP_NONE    0
+#define ARM_KERNEL_STEP_ACTIVE  1
+#define ARM_KERNEL_STEP_SUSPEND 2
+
+/*
+ * Limits.
+ * Changing these will require modifications to the register accessors.
+ */
+#define ARM_MAX_BRP             16
+#define ARM_MAX_WRP             16
+#define ARM_MAX_HBP_SLOTS       (ARM_MAX_BRP + ARM_MAX_WRP)
+
+/* Virtual debug register bases. */
+#define AARCH64_DBG_REG_BVR     0
+#define AARCH64_DBG_REG_BCR     (AARCH64_DBG_REG_BVR + ARM_MAX_BRP)
+#define AARCH64_DBG_REG_WVR     (AARCH64_DBG_REG_BCR + ARM_MAX_BRP)
+#define AARCH64_DBG_REG_WCR     (AARCH64_DBG_REG_WVR + ARM_MAX_WRP)
+
+/* Debug register names. */
+#define AARCH64_DBG_REG_NAME_BVR        "bvr"
+#define AARCH64_DBG_REG_NAME_BCR        "bcr"
+#define AARCH64_DBG_REG_NAME_WVR        "wvr"
+#define AARCH64_DBG_REG_NAME_WCR        "wcr"
+
+/* Accessor macros for the debug registers. */
+#define AARCH64_DBG_READ(N, REG, VAL) do {\
+        asm volatile("mrs %0, dbg" REG #N "_el1" : "=r" (VAL));\
+} while (0)
+
+#define AARCH64_DBG_WRITE(N, REG, VAL) do {\
+        asm volatile("msr dbg" REG #N "_el1, %0" :: "r" (VAL));\
+} while (0)
+
+struct task_struct;
+struct notifier_block;
+struct perf_event;
+struct pmu;
+
+extern int arch_bp_generic_fields(struct arch_hw_breakpoint_ctrl ctrl,
+                                  int *gen_len, int *gen_type);
+extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
+extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
+extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
+                                           unsigned long val, void *data);
+
+extern int arch_install_hw_breakpoint(struct perf_event *bp);
+extern void arch_uninstall_hw_breakpoint(struct perf_event *bp);
+extern void hw_breakpoint_pmu_read(struct perf_event *bp);
+extern int hw_breakpoint_slots(int type);
+
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+extern void hw_breakpoint_thread_switch(struct task_struct *next);
+extern void ptrace_hw_copy_thread(struct task_struct *task);
+#else
+static inline void hw_breakpoint_thread_switch(struct task_struct *next)
+{
+}
+static inline void ptrace_hw_copy_thread(struct task_struct *task)
+{
+}
+#endif
+
+extern struct pmu perf_ops_bp;
+
+#endif  /* __KERNEL__ */
+#endif  /* __ASM_BREAKPOINT_H */
diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h
new file mode 100644
index 00000000000..f8190ba45a3
--- /dev/null
+++ b/arch/arm64/include/asm/hwcap.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_HWCAP_H
+#define __ASM_HWCAP_H
+
+/*
+ * HWCAP flags - for elf_hwcap (in kernel) and AT_HWCAP
+ */
+#define HWCAP_FP                (1 << 0)
+#define HWCAP_ASIMD             (1 << 1)
+
+#define COMPAT_HWCAP_HALF       (1 << 1)
+#define COMPAT_HWCAP_THUMB      (1 << 2)
+#define COMPAT_HWCAP_FAST_MULT  (1 << 4)
+#define COMPAT_HWCAP_VFP        (1 << 6)
+#define COMPAT_HWCAP_EDSP       (1 << 7)
+#define COMPAT_HWCAP_NEON       (1 << 12)
+#define COMPAT_HWCAP_VFPv3      (1 << 13)
+#define COMPAT_HWCAP_TLS        (1 << 15)
+#define COMPAT_HWCAP_VFPv4      (1 << 16)
+#define COMPAT_HWCAP_IDIVA      (1 << 17)
+#define COMPAT_HWCAP_IDIVT      (1 << 18)
+#define COMPAT_HWCAP_IDIV       (COMPAT_HWCAP_IDIVA|COMPAT_HWCAP_IDIVT)
+
+#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
+/*
+ * This yields a mask that user programs can use to figure out what
+ * instruction set this cpu supports.
+ */
+#define ELF_HWCAP               (elf_hwcap)
+#define COMPAT_ELF_HWCAP        (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
+                                 COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
+                                 COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
+                                 COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
+                                 COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
+
+extern unsigned int elf_hwcap;
+#endif
+
+#endif
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
new file mode 100644
index 00000000000..74a2a7d304a
--- /dev/null
+++ b/arch/arm64/include/asm/io.h
@@ -0,0 +1,258 @@
+/*
+ * Based on arch/arm/include/asm/io.h
+ *
+ * Copyright (C) 1996-2000 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_IO_H
+#define __ASM_IO_H
+
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+
+#include <asm/byteorder.h>
+#include <asm/barrier.h>
+#include <asm/pgtable.h>
+
+/*
+ * Generic IO read/write.  These perform native-endian accesses.
+ */
+static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
+{
+        asm volatile("strb %w0, [%1]" : : "r" (val), "r" (addr));
+}
+
+static inline void __raw_writew(u16 val, volatile void __iomem *addr)
+{
+        asm volatile("strh %w0, [%1]" : : "r" (val), "r" (addr));
+}
+
+static inline void __raw_writel(u32 val, volatile void __iomem *addr)
+{
+        asm volatile("str %w0, [%1]" : : "r" (val), "r" (addr));
+}
+
+static inline void __raw_writeq(u64 val, volatile void __iomem *addr)
+{
+        asm volatile("str %0, [%1]" : : "r" (val), "r" (addr));
+}
+
+static inline u8 __raw_readb(const volatile void __iomem *addr)
+{
+        u8 val;
+        asm volatile("ldrb %w0, [%1]" : "=r" (val) : "r" (addr));
+        return val;
+}
+
+static inline u16 __raw_readw(const volatile void __iomem *addr)
+{
+        u16 val;
+        asm volatile("ldrh %w0, [%1]" : "=r" (val) : "r" (addr));
+        return val;
+}
+
+static inline u32 __raw_readl(const volatile void __iomem *addr)
+{
+        u32 val;
+        asm volatile("ldr %w0, [%1]" : "=r" (val) : "r" (addr));
+        return val;
+}
+
+static inline u64 __raw_readq(const volatile void __iomem *addr)
+{
+        u64 val;
+        asm volatile("ldr %0, [%1]" : "=r" (val) : "r" (addr));
+        return val;
+}
+
+/* IO barriers */
+#define __iormb()               rmb()
+#define __iowmb()               wmb()
+
+#define mmiowb()                do { } while (0)
+
+/*
+ * Relaxed I/O memory access primitives. These follow the Device memory
+ * ordering rules but do not guarantee any ordering relative to Normal memory
+ * accesses.
+ */
+#define readb_relaxed(c)        ({ u8  __v = __raw_readb(c); __v; })
+#define readw_relaxed(c)        ({ u16 __v = le16_to_cpu((__force __le16)__raw_readw(c)); __v; })
+#define readl_relaxed(c)        ({ u32 __v = le32_to_cpu((__force __le32)__raw_readl(c)); __v; })
+
+#define writeb_relaxed(v,c)     ((void)__raw_writeb((v),(c)))
+#define writew_relaxed(v,c)     ((void)__raw_writew((__force u16)cpu_to_le16(v),(c)))
+#define writel_relaxed(v,c)     ((void)__raw_writel((__force u32)cpu_to_le32(v),(c)))
+
+/*
+ * I/O memory access primitives. Reads are ordered relative to any
+ * following Normal memory access. Writes are ordered relative to any prior
+ * Normal memory access.
+ */
+#define readb(c)                ({ u8  __v = readb_relaxed(c); __iormb(); __v; })
+#define readw(c)                ({ u16 __v = readw_relaxed(c); __iormb(); __v; })
+#define readl(c)                ({ u32 __v = readl_relaxed(c); __iormb(); __v; })
+
+#define writeb(v,c)             ({ __iowmb(); writeb_relaxed((v),(c)); })
+#define writew(v,c)             ({ __iowmb(); writew_relaxed((v),(c)); })
+#define writel(v,c)             ({ __iowmb(); writel_relaxed((v),(c)); })
+
+/*
+ *  I/O port access primitives.
+ */
+#define IO_SPACE_LIMIT          0xffff
+#define PCI_IOBASE              ((void __iomem *)0xffffffbbfffe0000UL)
+
+static inline u8 inb(unsigned long addr)
+{
+        return readb(addr + PCI_IOBASE);
+}
+
+static inline u16 inw(unsigned long addr)
+{
+        return readw(addr + PCI_IOBASE);
+}
+
+static inline u32 inl(unsigned long addr)
+{
+        return readl(addr + PCI_IOBASE);
+}
+
+static inline void outb(u8 b, unsigned long addr)
+{
+        writeb(b, addr + PCI_IOBASE);
+}
+
+static inline void outw(u16 b, unsigned long addr)
+{
+        writew(b, addr + PCI_IOBASE);
+}
+
+static inline void outl(u32 b, unsigned long addr)
+{
+        writel(b, addr + PCI_IOBASE);
+}
+
+#define inb_p(addr)     inb(addr)
+#define inw_p(addr)     inw(addr)
+#define inl_p(addr)     inl(addr)
+
+#define outb_p(x, addr) outb((x), (addr))
+#define outw_p(x, addr) outw((x), (addr))
+#define outl_p(x, addr) outl((x), (addr))
+
+static inline void insb(unsigned long addr, void *buffer, int count)
+{
+        u8 *buf = buffer;
+        while (count--)
+                *buf++ = __raw_readb(addr + PCI_IOBASE);
+}
+
+static inline void insw(unsigned long addr, void *buffer, int count)
+{
+        u16 *buf = buffer;
+        while (count--)
+                *buf++ = __raw_readw(addr + PCI_IOBASE);
+}
+
+static inline void insl(unsigned long addr, void *buffer, int count)
+{
+        u32 *buf = buffer;
+        while (count--)
+                *buf++ = __raw_readl(addr + PCI_IOBASE);
+}
+
+static inline void outsb(unsigned long addr, const void *buffer, int count)
+{
+        const u8 *buf = buffer;
+        while (count--)
+                __raw_writeb(*buf++, addr + PCI_IOBASE);
+}
+
+static inline void outsw(unsigned long addr, const void *buffer, int count)
+{
+        const u16 *buf = buffer;
+        while (count--)
+                __raw_writew(*buf++, addr + PCI_IOBASE);
+}
+
+static inline void outsl(unsigned long addr, const void *buffer, int count)
+{
+        const u32 *buf = buffer;
+        while (count--)
+                __raw_writel(*buf++, addr + PCI_IOBASE);
+}
+
+#define insb_p(port,to,len)     insb(port,to,len)
+#define insw_p(port,to,len)     insw(port,to,len)
+#define insl_p(port,to,len)     insl(port,to,len)
+
+#define outsb_p(port,from,len)  outsb(port,from,len)
+#define outsw_p(port,from,len)  outsw(port,from,len)
+#define outsl_p(port,from,len)  outsl(port,from,len)
+
+/*
+ * String version of I/O memory access operations.
+ */
+extern void __memcpy_fromio(void *, const volatile void __iomem *, size_t);
+extern void __memcpy_toio(volatile void __iomem *, const void *, size_t);
+extern void __memset_io(volatile void __iomem *, int, size_t);
+
+#define memset_io(c,v,l)        __memset_io((c),(v),(l))
+#define memcpy_fromio(a,c,l)    __memcpy_fromio((a),(c),(l))
+#define memcpy_toio(c,a,l)      __memcpy_toio((c),(a),(l))
+
+/*
+ * I/O memory mapping functions.
+ */
+extern void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot);
+extern void __iounmap(volatile void __iomem *addr);
+
+#define PROT_DEFAULT            (PTE_TYPE_PAGE | PTE_AF | PTE_DIRTY)
+#define PROT_DEVICE_nGnRE       (PROT_DEFAULT | PTE_XN | PTE_ATTRINDX(MT_DEVICE_nGnRE))
+#define PROT_NORMAL_NC          (PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL_NC))
+
+#define ioremap(addr, size)             __ioremap((addr), (size), PROT_DEVICE_nGnRE)
+#define ioremap_nocache(addr, size)     __ioremap((addr), (size), PROT_DEVICE_nGnRE)
+#define ioremap_wc(addr, size)          __ioremap((addr), (size), PROT_NORMAL_NC)
+#define iounmap                         __iounmap
+
+#define ARCH_HAS_IOREMAP_WC
+#include <asm-generic/iomap.h>
+
+/*
+ * More restrictive address range checking than the default implementation
+ * (PHYS_OFFSET and PHYS_MASK taken into account).
+ */
+#define ARCH_HAS_VALID_PHYS_ADDR_RANGE
+extern int valid_phys_addr_range(unsigned long addr, size_t size);
+extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
+
+extern int devmem_is_allowed(unsigned long pfn);
+
+/*
+ * Convert a physical pointer to a virtual kernel pointer for /dev/mem
+ * access
+ */
+#define xlate_dev_mem_ptr(p)    __va(p)
+
+/*
+ * Convert a virtual cached pointer to an uncached pointer
+ */
+#define xlate_dev_kmem_ptr(p)   p
+
+#endif  /* __KERNEL__ */
+#endif  /* __ASM_IO_H */
diff --git a/arch/arm64/include/asm/irq.h b/arch/arm64/include/asm/irq.h
new file mode 100644
index 00000000000..a4e1cad3202
--- /dev/null
+++ b/arch/arm64/include/asm/irq.h
@@ -0,0 +1,8 @@
+#ifndef __ASM_IRQ_H
+#define __ASM_IRQ_H
+
+#include <asm-generic/irq.h>
+
+extern void (*handle_arch_irq)(struct pt_regs *);
+
+#endif
diff --git a/arch/arm64/include/asm/irqflags.h b/arch/arm64/include/asm/irqflags.h
new file mode 100644
index 00000000000..aa11943b850
--- /dev/null
+++ b/arch/arm64/include/asm/irqflags.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_IRQFLAGS_H
+#define __ASM_IRQFLAGS_H
+
+#ifdef __KERNEL__
+
+#include <asm/ptrace.h>
+
+/*
+ * CPU interrupt mask handling.
+ */
+static inline unsigned long arch_local_irq_save(void)
+{
+        unsigned long flags;
+        asm volatile(
+                "mrs    %0, daif                // arch_local_irq_save\n"
+                "msr    daifset, #2"
+                : "=r" (flags)
+                :
+                : "memory");
+        return flags;
+}
+
+static inline void arch_local_irq_enable(void)
+{
+        asm volatile(
+                "msr    daifclr, #2             // arch_local_irq_enable"
+                :
+                :
+                : "memory");
+}
+
+static inline void arch_local_irq_disable(void)
+{
+        asm volatile(
+                "msr    daifset, #2             // arch_local_irq_disable"
+                :
+                :
+                : "memory");
+}
+
+#define local_fiq_enable()      asm("msr        daifclr, #1" : : : "memory")
+#define local_fiq_disable()     asm("msr        daifset, #1" : : : "memory")
+
+/*
+ * Save the current interrupt enable state.
+ */
+static inline unsigned long arch_local_save_flags(void)
+{
+        unsigned long flags;
+        asm volatile(
+                "mrs    %0, daif                // arch_local_save_flags"
+                : "=r" (flags)
+                :
+                : "memory");
+        return flags;
+}
+
+/*
+ * restore saved IRQ state
+ */
+static inline void arch_local_irq_restore(unsigned long flags)
+{
+        asm volatile(
+                "msr    daif, %0                // arch_local_irq_restore"
+        :
+        : "r" (flags)
+        : "memory");
+}
+
+static inline int arch_irqs_disabled_flags(unsigned long flags)
+{
+        return flags & PSR_I_BIT;
+}
+
+#endif
+#endif
diff --git a/arch/arm64/include/asm/memblock.h b/arch/arm64/include/asm/memblock.h
new file mode 100644
index 00000000000..6afeed2467f
--- /dev/null
+++ b/arch/arm64/include/asm/memblock.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_MEMBLOCK_H
+#define __ASM_MEMBLOCK_H
+
+extern void arm64_memblock_init(void);
+
+#endif
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
new file mode 100644
index 00000000000..1cac16a001c
--- /dev/null
+++ b/arch/arm64/include/asm/memory.h
@@ -0,0 +1,144 @@
+/*
+ * Based on arch/arm/include/asm/memory.h
+ *
+ * Copyright (C) 2000-2002 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Note: this file should not be included by non-asm/.h files
+ */
+#ifndef __ASM_MEMORY_H
+#define __ASM_MEMORY_H
+
+#include <linux/compiler.h>
+#include <linux/const.h>
+#include <linux/types.h>
+#include <asm/sizes.h>
+
+/*
+ * Allow for constants defined here to be used from assembly code
+ * by prepending the UL suffix only with actual C code compilation.
+ */
+#define UL(x) _AC(x, UL)
+
+/*
+ * PAGE_OFFSET - the virtual address of the start of the kernel image.
+ * VA_BITS - the maximum number of bits for virtual addresses.
+ * TASK_SIZE - the maximum size of a user space task.
+ * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
+ * The module space lives between the addresses given by TASK_SIZE
+ * and PAGE_OFFSET - it must be within 128MB of the kernel text.
+ */
+#define PAGE_OFFSET             UL(0xffffffc000000000)
+#define MODULES_END             (PAGE_OFFSET)
+#define MODULES_VADDR           (MODULES_END - SZ_64M)
+#define VA_BITS                 (39)
+#define TASK_SIZE_64            (UL(1) << VA_BITS)
+
+#ifdef CONFIG_COMPAT
+#define TASK_SIZE_32            UL(0x100000000)
+#define TASK_SIZE               (test_thread_flag(TIF_32BIT) ? \
+                                TASK_SIZE_32 : TASK_SIZE_64)
+#else
+#define TASK_SIZE               TASK_SIZE_64
+#endif /* CONFIG_COMPAT */
+
+#define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 4))
+
+#if TASK_SIZE_64 > MODULES_VADDR
+#error Top of 64-bit user space clashes with start of module space
+#endif
+
+/*
+ * Physical vs virtual RAM address space conversion.  These are
+ * private definitions which should NOT be used outside memory.h
+ * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
+ */
+#define __virt_to_phys(x)       (((phys_addr_t)(x) - PAGE_OFFSET + PHYS_OFFSET))
+#define __phys_to_virt(x)       ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET))
+
+/*
+ * Convert a physical address to a Page Frame Number and back
+ */
+#define __phys_to_pfn(paddr)    ((unsigned long)((paddr) >> PAGE_SHIFT))
+#define __pfn_to_phys(pfn)      ((phys_addr_t)(pfn) << PAGE_SHIFT)
+
+/*
+ * Convert a page to/from a physical address
+ */
+#define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
+#define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
+
+/*
+ * Memory types available.
+ */
+#define MT_DEVICE_nGnRnE        0
+#define MT_DEVICE_nGnRE         1
+#define MT_DEVICE_GRE           2
+#define MT_NORMAL_NC            3
+#define MT_NORMAL               4
+
+#ifndef __ASSEMBLY__
+
+extern phys_addr_t              memstart_addr;
+/* PHYS_OFFSET - the physical address of the start of memory. */
+#define PHYS_OFFSET             ({ memstart_addr; })
+
+/*
+ * PFNs are used to describe any physical page; this means
+ * PFN 0 == physical address 0.
+ *
+ * This is the PFN of the first RAM page in the kernel
+ * direct-mapped view.  We assume this is the first page
+ * of RAM in the mem_map as well.
+ */
+#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
+
+/*
+ * Note: Drivers should NOT use these.  They are the wrong
+ * translation for translating DMA addresses.  Use the driver
+ * DMA support - see dma-mapping.h.
+ */
+static inline phys_addr_t virt_to_phys(const volatile void *x)
+{
+        return __virt_to_phys((unsigned long)(x));
+}
+
+static inline void *phys_to_virt(phys_addr_t x)
+{
+        return (void *)(__phys_to_virt(x));
+}
+
+/*
+ * Drivers should NOT use these either.
+ */
+#define __pa(x)                 __virt_to_phys((unsigned long)(x))
+#define __va(x)                 ((void *)__phys_to_virt((phys_addr_t)(x)))
+#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
+
+/*
+ *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
+ *  virt_addr_valid(k)  indicates whether a virtual address is valid
+ */
+#define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
+
+#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
+#define virt_addr_valid(kaddr)  (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
+                                 ((void *)(kaddr) < (void *)high_memory))
+
+#endif
+
+#include <asm-generic/memory_model.h>
+
+#endif
diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h
new file mode 100644
index 00000000000..d4f7fd5b9e3
--- /dev/null
+++ b/arch/arm64/include/asm/mmu.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_MMU_H
+#define __ASM_MMU_H
+
+typedef struct {
+        unsigned int id;
+        raw_spinlock_t id_lock;
+        void *vdso;
+} mm_context_t;
+
+#define ASID(mm)        ((mm)->context.id & 0xffff)
+
+extern void paging_init(void);
+extern void setup_mm_for_reboot(void);
+
+#endif
diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h
new file mode 100644
index 00000000000..f68465dee02
--- /dev/null
+++ b/arch/arm64/include/asm/mmu_context.h
@@ -0,0 +1,152 @@
+/*
+ * Based on arch/arm/include/asm/mmu_context.h
+ *
+ * Copyright (C) 1996 Russell King.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_MMU_CONTEXT_H
+#define __ASM_MMU_CONTEXT_H
+
+#include <linux/compiler.h>
+#include <linux/sched.h>
+
+#include <asm/cacheflush.h>
+#include <asm/proc-fns.h>
+#include <asm-generic/mm_hooks.h>
+#include <asm/cputype.h>
+#include <asm/pgtable.h>
+
+#define MAX_ASID_BITS   16
+
+extern unsigned int cpu_last_asid;
+
+void __init_new_context(struct task_struct *tsk, struct mm_struct *mm);
+void __new_context(struct mm_struct *mm);
+
+/*
+ * Set TTBR0 to empty_zero_page. No translations will be possible via TTBR0.
+ */
+static inline void cpu_set_reserved_ttbr0(void)
+{
+        unsigned long ttbr = page_to_phys(empty_zero_page);
+
+        asm(
+        "       msr     ttbr0_el1, %0                   // set TTBR0\n"
+        "       isb"
+        :
+        : "r" (ttbr));
+}
+
+static inline void switch_new_context(struct mm_struct *mm)
+{
+        unsigned long flags;
+
+        __new_context(mm);
+
+        local_irq_save(flags);
+        cpu_switch_mm(mm->pgd, mm);
+        local_irq_restore(flags);
+}
+
+static inline void check_and_switch_context(struct mm_struct *mm,
+                                            struct task_struct *tsk)
+{
+        /*
+         * Required during context switch to avoid speculative page table
+         * walking with the wrong TTBR.
+         */
+        cpu_set_reserved_ttbr0();
+
+        if (!((mm->context.id ^ cpu_last_asid) >> MAX_ASID_BITS))
+                /*
+                 * The ASID is from the current generation, just switch to the
+                 * new pgd. This condition is only true for calls from
+                 * context_switch() and interrupts are already disabled.
+                 */
+                cpu_switch_mm(mm->pgd, mm);
+        else if (irqs_disabled())
+                /*
+                 * Defer the new ASID allocation until after the context
+                 * switch critical region since __new_context() cannot be
+                 * called with interrupts disabled.
+                 */
+                set_ti_thread_flag(task_thread_info(tsk), TIF_SWITCH_MM);
+        else
+                /*
+                 * That is a direct call to switch_mm() or activate_mm() with
+                 * interrupts enabled and a new context.
+                 */
+                switch_new_context(mm);
+}
+
+#define init_new_context(tsk,mm)        (__init_new_context(tsk,mm),0)
+#define destroy_context(mm)             do { } while(0)
+
+#define finish_arch_post_lock_switch \
+        finish_arch_post_lock_switch
+static inline void finish_arch_post_lock_switch(void)
+{
+        if (test_and_clear_thread_flag(TIF_SWITCH_MM)) {
+                struct mm_struct *mm = current->mm;
+                unsigned long flags;
+
+                __new_context(mm);
+
+                local_irq_save(flags);
+                cpu_switch_mm(mm->pgd, mm);
+                local_irq_restore(flags);
+        }
+}
+
+/*
+ * This is called when "tsk" is about to enter lazy TLB mode.
+ *
+ * mm:  describes the currently active mm context
+ * tsk: task which is entering lazy tlb
+ * cpu: cpu number which is entering lazy tlb
+ *
+ * tsk->mm will be NULL
+ */
+static inline void
+enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
+{
+}
+
+/*
+ * This is the actual mm switch as far as the scheduler
+ * is concerned.  No registers are touched.  We avoid
+ * calling the CPU specific function when the mm hasn't
+ * actually changed.
+ */
+static inline void
+switch_mm(struct mm_struct *prev, struct mm_struct *next,
+          struct task_struct *tsk)
+{
+        unsigned int cpu = smp_processor_id();
+
+#ifdef CONFIG_SMP
+        /* check for possible thread migration */
+        if (!cpumask_empty(mm_cpumask(next)) &&
+            !cpumask_test_cpu(cpu, mm_cpumask(next)))
+                __flush_icache_all();
+#endif
+        if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)) || prev != next)
+                check_and_switch_context(next, tsk);
+}
+
+#define deactivate_mm(tsk,mm)   do { } while (0)
+#define activate_mm(prev,next)  switch_mm(prev, next, NULL)
+
+#endif
diff --git a/arch/arm64/include/asm/module.h b/arch/arm64/include/asm/module.h
new file mode 100644
index 00000000000..e80e232b730
--- /dev/null
+++ b/arch/arm64/include/asm/module.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_MODULE_H
+#define __ASM_MODULE_H
+
+#include <asm-generic/module.h>
+
+#define MODULE_ARCH_VERMAGIC    "aarch64"
+
+#endif /* __ASM_MODULE_H */
diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h
new file mode 100644
index 00000000000..46bf66628b6
--- /dev/null
+++ b/arch/arm64/include/asm/page.h
@@ -0,0 +1,67 @@
+/*
+ * Based on arch/arm/include/asm/page.h
+ *
+ * Copyright (C) 1995-2003 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PAGE_H
+#define __ASM_PAGE_H
+
+/* PAGE_SHIFT determines the page size */
+#ifdef CONFIG_ARM64_64K_PAGES
+#define PAGE_SHIFT              16
+#else
+#define PAGE_SHIFT              12
+#endif
+#define PAGE_SIZE               (_AC(1,UL) << PAGE_SHIFT)
+#define PAGE_MASK               (~(PAGE_SIZE-1))
+
+/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
+#define __HAVE_ARCH_GATE_AREA           1
+
+#ifndef __ASSEMBLY__
+
+#ifdef CONFIG_ARM64_64K_PAGES
+#include <asm/pgtable-2level-types.h>
+#else
+#include <asm/pgtable-3level-types.h>
+#endif
+
+extern void __cpu_clear_user_page(void *p, unsigned long user);
+extern void __cpu_copy_user_page(void *to, const void *from,
+                                 unsigned long user);
+extern void copy_page(void *to, const void *from);
+extern void clear_page(void *to);
+
+#define clear_user_page(addr,vaddr,pg)  __cpu_clear_user_page(addr, vaddr)
+#define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
+
+typedef struct page *pgtable_t;
+
+#ifdef CONFIG_HAVE_ARCH_PFN_VALID
+extern int pfn_valid(unsigned long);
+#endif
+
+#include <asm/memory.h>
+
+#endif /* !__ASSEMBLY__ */
+
+#define VM_DATA_DEFAULT_FLAGS \
+        (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
+         VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
+#include <asm-generic/getorder.h>
+
+#endif
diff --git a/arch/arm64/include/asm/param.h b/arch/arm64/include/asm/param.h
new file mode 100644
index 00000000000..8e3a281d448
--- /dev/null
+++ b/arch/arm64/include/asm/param.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PARAM_H
+#define __ASM_PARAM_H
+
+#define EXEC_PAGESIZE   65536
+
+#include <asm-generic/param.h>
+
+#endif
diff --git a/arch/arm64/include/asm/perf_event.h b/arch/arm64/include/asm/perf_event.h
new file mode 100644
index 00000000000..a6fffd511c5
--- /dev/null
+++ b/arch/arm64/include/asm/perf_event.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ASM_PERF_EVENT_H
+#define __ASM_PERF_EVENT_H
+
+/* It's quiet around here... */
+
+#endif
diff --git a/arch/arm64/include/asm/pgalloc.h b/arch/arm64/include/asm/pgalloc.h
new file mode 100644
index 00000000000..f214069ec5d
--- /dev/null
+++ b/arch/arm64/include/asm/pgalloc.h
@@ -0,0 +1,113 @@
+/*
+ * Based on arch/arm/include/asm/pgalloc.h
+ *
+ * Copyright (C) 2000-2001 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PGALLOC_H
+#define __ASM_PGALLOC_H
+
+#include <asm/pgtable-hwdef.h>
+#include <asm/processor.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+
+#define check_pgt_cache()               do { } while (0)
+
+#ifndef CONFIG_ARM64_64K_PAGES
+
+static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
+{
+        return (pmd_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
+}
+
+static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
+{
+        BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
+        free_page((unsigned long)pmd);
+}
+
+static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
+{
+        set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
+}
+
+#endif  /* CONFIG_ARM64_64K_PAGES */
+
+extern pgd_t *pgd_alloc(struct mm_struct *mm);
+extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
+
+#define PGALLOC_GFP     (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
+
+static inline pte_t *
+pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
+{
+        return (pte_t *)__get_free_page(PGALLOC_GFP);
+}
+
+static inline pgtable_t
+pte_alloc_one(struct mm_struct *mm, unsigned long addr)
+{
+        struct page *pte;
+
+        pte = alloc_pages(PGALLOC_GFP, 0);
+        if (pte)
+                pgtable_page_ctor(pte);
+
+        return pte;
+}
+
+/*
+ * Free a PTE table.
+ */
+static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
+{
+        if (pte)
+                free_page((unsigned long)pte);
+}
+
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
+{
+        pgtable_page_dtor(pte);
+        __free_page(pte);
+}
+
+static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
+                                  pmdval_t prot)
+{
+        set_pmd(pmdp, __pmd(pte | prot));
+}
+
+/*
+ * Populate the pmdp entry with a pointer to the pte.  This pmd is part
+ * of the mm address space.
+ */
+static inline void
+pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
+{
+        /*
+         * The pmd must be loaded with the physical address of the PTE table
+         */
+        __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
+}
+
+static inline void
+pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
+{
+        __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
+}
+#define pmd_pgtable(pmd) pmd_page(pmd)
+
+#endif
diff --git a/arch/arm64/include/asm/pgtable-2level-hwdef.h b/arch/arm64/include/asm/pgtable-2level-hwdef.h
new file mode 100644
index 00000000000..0a8ed3f94e9
--- /dev/null
+++ b/arch/arm64/include/asm/pgtable-2level-hwdef.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PGTABLE_2LEVEL_HWDEF_H
+#define __ASM_PGTABLE_2LEVEL_HWDEF_H
+
+/*
+ * With LPAE and 64KB pages, there are 2 levels of page tables. Each level has
+ * 8192 entries of 8 bytes each, occupying a 64KB page. Levels 0 and 1 are not
+ * used. The 2nd level table (PGD for Linux) can cover a range of 4TB, each
+ * entry representing 512MB. The user and kernel address spaces are limited to
+ * 512GB and therefore we only use 1024 entries in the PGD.
+ */
+#define PTRS_PER_PTE            8192
+#define PTRS_PER_PGD            1024
+
+/*
+ * PGDIR_SHIFT determines the size a top-level page table entry can map.
+ */
+#define PGDIR_SHIFT             29
+#define PGDIR_SIZE              (_AC(1, UL) << PGDIR_SHIFT)
+#define PGDIR_MASK              (~(PGDIR_SIZE-1))
+
+/*
+ * section address mask and size definitions.
+ */
+#define SECTION_SHIFT           29
+#define SECTION_SIZE            (_AC(1, UL) << SECTION_SHIFT)
+#define SECTION_MASK            (~(SECTION_SIZE-1))
+
+#endif
diff --git a/arch/arm64/include/asm/pgtable-2level-types.h b/arch/arm64/include/asm/pgtable-2level-types.h
new file mode 100644
index 00000000000..3c3ca7d361e
--- /dev/null
+++ b/arch/arm64/include/asm/pgtable-2level-types.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PGTABLE_2LEVEL_TYPES_H
+#define __ASM_PGTABLE_2LEVEL_TYPES_H
+
+typedef u64 pteval_t;
+typedef u64 pgdval_t;
+typedef pgdval_t pmdval_t;
+
+#undef STRICT_MM_TYPECHECKS
+
+#ifdef STRICT_MM_TYPECHECKS
+
+/*
+ * These are used to make use of C type-checking..
+ */
+typedef struct { pteval_t pte; } pte_t;
+typedef struct { pgdval_t pgd; } pgd_t;
+typedef struct { pteval_t pgprot; } pgprot_t;
+
+#define pte_val(x)      ((x).pte)
+#define pgd_val(x)      ((x).pgd)
+#define pgprot_val(x)   ((x).pgprot)
+
+#define __pte(x)        ((pte_t) { (x) } )
+#define __pgd(x)        ((pgd_t) { (x) } )
+#define __pgprot(x)     ((pgprot_t) { (x) } )
+
+#else   /* !STRICT_MM_TYPECHECKS */
+
+typedef pteval_t pte_t;
+typedef pgdval_t pgd_t;
+typedef pteval_t pgprot_t;
+
+#define pte_val(x)      (x)
+#define pgd_val(x)      (x)
+#define pgprot_val(x)   (x)
+
+#define __pte(x)        (x)
+#define __pgd(x)        (x)
+#define __pgprot(x)     (x)
+
+#endif  /* STRICT_MM_TYPECHECKS */
+
+#include <asm-generic/pgtable-nopmd.h>
+
+#endif  /* __ASM_PGTABLE_2LEVEL_TYPES_H */
diff --git a/arch/arm64/include/asm/pgtable-3level-hwdef.h b/arch/arm64/include/asm/pgtable-3level-hwdef.h
new file mode 100644
index 00000000000..3dbf941d776
--- /dev/null
+++ b/arch/arm64/include/asm/pgtable-3level-hwdef.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PGTABLE_3LEVEL_HWDEF_H
+#define __ASM_PGTABLE_3LEVEL_HWDEF_H
+
+/*
+ * With LPAE and 4KB pages, there are 3 levels of page tables. Each level has
+ * 512 entries of 8 bytes each, occupying a 4K page. The first level table
+ * covers a range of 512GB, each entry representing 1GB. The user and kernel
+ * address spaces are limited to 512GB each.
+ */
+#define PTRS_PER_PTE            512
+#define PTRS_PER_PMD            512
+#define PTRS_PER_PGD            512
+
+/*
+ * PGDIR_SHIFT determines the size a top-level page table entry can map.
+ */
+#define PGDIR_SHIFT             30
+#define PGDIR_SIZE              (_AC(1, UL) << PGDIR_SHIFT)
+#define PGDIR_MASK              (~(PGDIR_SIZE-1))
+
+/*
+ * PMD_SHIFT determines the size a middle-level page table entry can map.
+ */
+#define PMD_SHIFT               21
+#define PMD_SIZE                (_AC(1, UL) << PMD_SHIFT)
+#define PMD_MASK                (~(PMD_SIZE-1))
+
+/*
+ * section address mask and size definitions.
+ */
+#define SECTION_SHIFT           21
+#define SECTION_SIZE            (_AC(1, UL) << SECTION_SHIFT)
+#define SECTION_MASK            (~(SECTION_SIZE-1))
+
+#endif
diff --git a/arch/arm64/include/asm/pgtable-3level-types.h b/arch/arm64/include/asm/pgtable-3level-types.h
new file mode 100644
index 00000000000..4489615f14a
--- /dev/null
+++ b/arch/arm64/include/asm/pgtable-3level-types.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PGTABLE_3LEVEL_TYPES_H
+#define __ASM_PGTABLE_3LEVEL_TYPES_H
+
+typedef u64 pteval_t;
+typedef u64 pmdval_t;
+typedef u64 pgdval_t;
+
+#undef STRICT_MM_TYPECHECKS
+
+#ifdef STRICT_MM_TYPECHECKS
+
+/*
+ * These are used to make use of C type-checking..
+ */
+typedef struct { pteval_t pte; } pte_t;
+typedef struct { pmdval_t pmd; } pmd_t;
+typedef struct { pgdval_t pgd; } pgd_t;
+typedef struct { pteval_t pgprot; } pgprot_t;
+
+#define pte_val(x)      ((x).pte)
+#define pmd_val(x)      ((x).pmd)
+#define pgd_val(x)      ((x).pgd)
+#define pgprot_val(x)   ((x).pgprot)
+
+#define __pte(x)        ((pte_t) { (x) } )
+#define __pmd(x)        ((pmd_t) { (x) } )
+#define __pgd(x)        ((pgd_t) { (x) } )
+#define __pgprot(x)     ((pgprot_t) { (x) } )
+
+#else   /* !STRICT_MM_TYPECHECKS */
+
+typedef pteval_t pte_t;
+typedef pmdval_t pmd_t;
+typedef pgdval_t pgd_t;
+typedef pteval_t pgprot_t;
+
+#define pte_val(x)      (x)
+#define pmd_val(x)      (x)
+#define pgd_val(x)      (x)
+#define pgprot_val(x)   (x)
+
+#define __pte(x)        (x)
+#define __pmd(x)        (x)
+#define __pgd(x)        (x)
+#define __pgprot(x)     (x)
+
+#endif  /* STRICT_MM_TYPECHECKS */
+
+#include <asm-generic/pgtable-nopud.h>
+
+#endif  /* __ASM_PGTABLE_3LEVEL_TYPES_H */
diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h
new file mode 100644
index 00000000000..0f3b4581d92
--- /dev/null
+++ b/arch/arm64/include/asm/pgtable-hwdef.h
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PGTABLE_HWDEF_H
+#define __ASM_PGTABLE_HWDEF_H
+
+#ifdef CONFIG_ARM64_64K_PAGES
+#include <asm/pgtable-2level-hwdef.h>
+#else
+#include <asm/pgtable-3level-hwdef.h>
+#endif
+
+/*
+ * Hardware page table definitions.
+ *
+ * Level 2 descriptor (PMD).
+ */
+#define PMD_TYPE_MASK           (_AT(pmdval_t, 3) << 0)
+#define PMD_TYPE_FAULT          (_AT(pmdval_t, 0) << 0)
+#define PMD_TYPE_TABLE          (_AT(pmdval_t, 3) << 0)
+#define PMD_TYPE_SECT           (_AT(pmdval_t, 1) << 0)
+
+/*
+ * Section
+ */
+#define PMD_SECT_S              (_AT(pmdval_t, 3) << 8)
+#define PMD_SECT_AF             (_AT(pmdval_t, 1) << 10)
+#define PMD_SECT_NG             (_AT(pmdval_t, 1) << 11)
+#define PMD_SECT_XN             (_AT(pmdval_t, 1) << 54)
+
+/*
+ * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
+ */
+#define PMD_ATTRINDX(t)         (_AT(pmdval_t, (t)) << 2)
+#define PMD_ATTRINDX_MASK       (_AT(pmdval_t, 7) << 2)
+
+/*
+ * Level 3 descriptor (PTE).
+ */
+#define PTE_TYPE_MASK           (_AT(pteval_t, 3) << 0)
+#define PTE_TYPE_FAULT          (_AT(pteval_t, 0) << 0)
+#define PTE_TYPE_PAGE           (_AT(pteval_t, 3) << 0)
+#define PTE_USER                (_AT(pteval_t, 1) << 6)         /* AP[1] */
+#define PTE_RDONLY              (_AT(pteval_t, 1) << 7)         /* AP[2] */
+#define PTE_SHARED              (_AT(pteval_t, 3) << 8)         /* SH[1:0], inner shareable */
+#define PTE_AF                  (_AT(pteval_t, 1) << 10)        /* Access Flag */
+#define PTE_NG                  (_AT(pteval_t, 1) << 11)        /* nG */
+#define PTE_XN                  (_AT(pteval_t, 1) << 54)        /* XN */
+
+/*
+ * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
+ */
+#define PTE_ATTRINDX(t)         (_AT(pteval_t, (t)) << 2)
+#define PTE_ATTRINDX_MASK       (_AT(pteval_t, 7) << 2)
+
+/*
+ * 40-bit physical address supported.
+ */
+#define PHYS_MASK_SHIFT         (40)
+#define PHYS_MASK               ((UL(1) << PHYS_MASK_SHIFT) - 1)
+
+/*
+ * TCR flags.
+ */
+#define TCR_TxSZ(x)             (((UL(64) - (x)) << 16) | ((UL(64) - (x)) << 0))
+#define TCR_IRGN_NC             ((UL(0) << 8) | (UL(0) << 24))
+#define TCR_IRGN_WBWA           ((UL(1) << 8) | (UL(1) << 24))
+#define TCR_IRGN_WT             ((UL(2) << 8) | (UL(2) << 24))
+#define TCR_IRGN_WBnWA          ((UL(3) << 8) | (UL(3) << 24))
+#define TCR_IRGN_MASK           ((UL(3) << 8) | (UL(3) << 24))
+#define TCR_ORGN_NC             ((UL(0) << 10) | (UL(0) << 26))
+#define TCR_ORGN_WBWA           ((UL(1) << 10) | (UL(1) << 26))
+#define TCR_ORGN_WT             ((UL(2) << 10) | (UL(2) << 26))
+#define TCR_ORGN_WBnWA          ((UL(3) << 10) | (UL(3) << 26))
+#define TCR_ORGN_MASK           ((UL(3) << 10) | (UL(3) << 26))
+#define TCR_SHARED              ((UL(3) << 12) | (UL(3) << 28))
+#define TCR_TG0_64K             (UL(1) << 14)
+#define TCR_TG1_64K             (UL(1) << 30)
+#define TCR_IPS_40BIT           (UL(2) << 32)
+#define TCR_ASID16              (UL(1) << 36)
+
+#endif
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
new file mode 100644
index 00000000000..8960239be72
--- /dev/null
+++ b/arch/arm64/include/asm/pgtable.h
@@ -0,0 +1,328 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PGTABLE_H
+#define __ASM_PGTABLE_H
+
+#include <asm/proc-fns.h>
+
+#include <asm/memory.h>
+#include <asm/pgtable-hwdef.h>
+
+/*
+ * Software defined PTE bits definition.
+ */
+#define PTE_VALID               (_AT(pteval_t, 1) << 0) /* pte_present() check */
+#define PTE_FILE                (_AT(pteval_t, 1) << 2) /* only when !pte_present() */
+#define PTE_DIRTY               (_AT(pteval_t, 1) << 55)
+#define PTE_SPECIAL             (_AT(pteval_t, 1) << 56)
+
+/*
+ * VMALLOC and SPARSEMEM_VMEMMAP ranges.
+ */
+#define VMALLOC_START           UL(0xffffff8000000000)
+#define VMALLOC_END             (PAGE_OFFSET - UL(0x400000000) - SZ_64K)
+
+#define vmemmap                 ((struct page *)(VMALLOC_END + SZ_64K))
+
+#define FIRST_USER_ADDRESS      0
+
+#ifndef __ASSEMBLY__
+extern void __pte_error(const char *file, int line, unsigned long val);
+extern void __pmd_error(const char *file, int line, unsigned long val);
+extern void __pgd_error(const char *file, int line, unsigned long val);
+
+#define pte_ERROR(pte)          __pte_error(__FILE__, __LINE__, pte_val(pte))
+#ifndef CONFIG_ARM64_64K_PAGES
+#define pmd_ERROR(pmd)          __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
+#endif
+#define pgd_ERROR(pgd)          __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
+
+/*
+ * The pgprot_* and protection_map entries will be fixed up at runtime to
+ * include the cachable and bufferable bits based on memory policy, as well as
+ * any architecture dependent bits like global/ASID and SMP shared mapping
+ * bits.
+ */
+#define _PAGE_DEFAULT           PTE_TYPE_PAGE | PTE_AF
+
+extern pgprot_t pgprot_default;
+
+#define _MOD_PROT(p, b) __pgprot(pgprot_val(p) | (b))
+
+#define PAGE_NONE               _MOD_PROT(pgprot_default, PTE_NG | PTE_XN | PTE_RDONLY)
+#define PAGE_SHARED             _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_XN)
+#define PAGE_SHARED_EXEC        _MOD_PROT(pgprot_default, PTE_USER | PTE_NG)
+#define PAGE_COPY               _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_XN | PTE_RDONLY)
+#define PAGE_COPY_EXEC          _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_RDONLY)
+#define PAGE_READONLY           _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_XN | PTE_RDONLY)
+#define PAGE_READONLY_EXEC      _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_RDONLY)
+#define PAGE_KERNEL             _MOD_PROT(pgprot_default, PTE_XN | PTE_DIRTY)
+#define PAGE_KERNEL_EXEC        _MOD_PROT(pgprot_default, PTE_DIRTY)
+
+#define __PAGE_NONE             __pgprot(_PAGE_DEFAULT | PTE_NG | PTE_XN | PTE_RDONLY)
+#define __PAGE_SHARED           __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_XN)
+#define __PAGE_SHARED_EXEC      __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG)
+#define __PAGE_COPY             __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_XN | PTE_RDONLY)
+#define __PAGE_COPY_EXEC        __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_RDONLY)
+#define __PAGE_READONLY         __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_XN | PTE_RDONLY)
+#define __PAGE_READONLY_EXEC    __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_RDONLY)
+
+#endif /* __ASSEMBLY__ */
+
+#define __P000  __PAGE_NONE
+#define __P001  __PAGE_READONLY
+#define __P010  __PAGE_COPY
+#define __P011  __PAGE_COPY
+#define __P100  __PAGE_READONLY_EXEC
+#define __P101  __PAGE_READONLY_EXEC
+#define __P110  __PAGE_COPY_EXEC
+#define __P111  __PAGE_COPY_EXEC
+
+#define __S000  __PAGE_NONE
+#define __S001  __PAGE_READONLY
+#define __S010  __PAGE_SHARED
+#define __S011  __PAGE_SHARED
+#define __S100  __PAGE_READONLY_EXEC
+#define __S101  __PAGE_READONLY_EXEC
+#define __S110  __PAGE_SHARED_EXEC
+#define __S111  __PAGE_SHARED_EXEC
+
+#ifndef __ASSEMBLY__
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+extern struct page *empty_zero_page;
+#define ZERO_PAGE(vaddr)        (empty_zero_page)
+
+#define pte_pfn(pte)            ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)
+
+#define pfn_pte(pfn,prot)       (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
+
+#define pte_none(pte)           (!pte_val(pte))
+#define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0))
+#define pte_page(pte)           (pfn_to_page(pte_pfn(pte)))
+#define pte_offset_kernel(dir,addr)     (pmd_page_vaddr(*(dir)) + __pte_index(addr))
+
+#define pte_offset_map(dir,addr)        pte_offset_kernel((dir), (addr))
+#define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
+#define pte_unmap(pte)                  do { } while (0)
+#define pte_unmap_nested(pte)           do { } while (0)
+
+/*
+ * The following only work if pte_present(). Undefined behaviour otherwise.
+ */
+#define pte_present(pte)        (pte_val(pte) & PTE_VALID)
+#define pte_dirty(pte)          (pte_val(pte) & PTE_DIRTY)
+#define pte_young(pte)          (pte_val(pte) & PTE_AF)
+#define pte_special(pte)        (pte_val(pte) & PTE_SPECIAL)
+#define pte_write(pte)          (!(pte_val(pte) & PTE_RDONLY))
+#define pte_exec(pte)           (!(pte_val(pte) & PTE_XN))
+
+#define pte_present_exec_user(pte) \
+        ((pte_val(pte) & (PTE_VALID | PTE_USER | PTE_XN)) == \
+         (PTE_VALID | PTE_USER))
+
+#define PTE_BIT_FUNC(fn,op) \
+static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
+
+PTE_BIT_FUNC(wrprotect, |= PTE_RDONLY);
+PTE_BIT_FUNC(mkwrite,   &= ~PTE_RDONLY);
+PTE_BIT_FUNC(mkclean,   &= ~PTE_DIRTY);
+PTE_BIT_FUNC(mkdirty,   |= PTE_DIRTY);
+PTE_BIT_FUNC(mkold,     &= ~PTE_AF);
+PTE_BIT_FUNC(mkyoung,   |= PTE_AF);
+PTE_BIT_FUNC(mkspecial, |= PTE_SPECIAL);
+
+static inline void set_pte(pte_t *ptep, pte_t pte)
+{
+        *ptep = pte;
+}
+
+extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
+
+static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
+                              pte_t *ptep, pte_t pte)
+{
+        if (pte_present_exec_user(pte))
+                __sync_icache_dcache(pte, addr);
+        set_pte(ptep, pte);
+}
+
+/*
+ * Huge pte definitions.
+ */
+#define pte_huge(pte)           ((pte_val(pte) & PTE_TYPE_MASK) == PTE_TYPE_HUGEPAGE)
+#define pte_mkhuge(pte)         (__pte((pte_val(pte) & ~PTE_TYPE_MASK) | PTE_TYPE_HUGEPAGE))
+
+#define __pgprot_modify(prot,mask,bits)         \
+        __pgprot((pgprot_val(prot) & ~(mask)) | (bits))
+
+#define __HAVE_ARCH_PTE_SPECIAL
+
+/*
+ * Mark the prot value as uncacheable and unbufferable.
+ */
+#define pgprot_noncached(prot) \
+        __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE))
+#define pgprot_writecombine(prot) \
+        __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_GRE))
+#define pgprot_dmacoherent(prot) \
+        __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC))
+#define __HAVE_PHYS_MEM_ACCESS_PROT
+struct file;
+extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
+                                     unsigned long size, pgprot_t vma_prot);
+
+#define pmd_none(pmd)           (!pmd_val(pmd))
+#define pmd_present(pmd)        (pmd_val(pmd))
+
+#define pmd_bad(pmd)            (!(pmd_val(pmd) & 2))
+
+static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
+{
+        *pmdp = pmd;
+        dsb();
+}
+
+static inline void pmd_clear(pmd_t *pmdp)
+{
+        set_pmd(pmdp, __pmd(0));
+}
+
+static inline pte_t *pmd_page_vaddr(pmd_t pmd)
+{
+        return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
+}
+
+#define pmd_page(pmd)           pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+#define mk_pte(page,prot)       pfn_pte(page_to_pfn(page),prot)
+
+#ifndef CONFIG_ARM64_64K_PAGES
+
+#define pud_none(pud)           (!pud_val(pud))
+#define pud_bad(pud)            (!(pud_val(pud) & 2))
+#define pud_present(pud)        (pud_val(pud))
+
+static inline void set_pud(pud_t *pudp, pud_t pud)
+{
+        *pudp = pud;
+        dsb();
+}
+
+static inline void pud_clear(pud_t *pudp)
+{
+        set_pud(pudp, __pud(0));
+}
+
+static inline pmd_t *pud_page_vaddr(pud_t pud)
+{
+        return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK);
+}
+
+#endif  /* CONFIG_ARM64_64K_PAGES */
+
+/* to find an entry in a page-table-directory */
+#define pgd_index(addr)         (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
+
+#define pgd_offset(mm, addr)    ((mm)->pgd+pgd_index(addr))
+
+/* to find an entry in a kernel page-table-directory */
+#define pgd_offset_k(addr)      pgd_offset(&init_mm, addr)
+
+/* Find an entry in the second-level page table.. */
+#ifndef CONFIG_ARM64_64K_PAGES
+#define pmd_index(addr)         (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
+static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
+{
+        return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr);
+}
+#endif
+
+/* Find an entry in the third-level page table.. */
+#define __pte_index(addr)       (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+        const pteval_t mask = PTE_USER | PTE_XN | PTE_RDONLY;
+        pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
+        return pte;
+}
+
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
+
+#define SWAPPER_DIR_SIZE        (3 * PAGE_SIZE)
+#define IDMAP_DIR_SIZE          (2 * PAGE_SIZE)
+
+/*
+ * Encode and decode a swap entry:
+ *      bits 0-1:       present (must be zero)
+ *      bit  2:         PTE_FILE
+ *      bits 3-8:       swap type
+ *      bits 9-63:      swap offset
+ */
+#define __SWP_TYPE_SHIFT        3
+#define __SWP_TYPE_BITS         6
+#define __SWP_TYPE_MASK         ((1 << __SWP_TYPE_BITS) - 1)
+#define __SWP_OFFSET_SHIFT      (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
+
+#define __swp_type(x)           (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
+#define __swp_offset(x)         ((x).val >> __SWP_OFFSET_SHIFT)
+#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
+
+#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
+#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
+
+/*
+ * Ensure that there are not more swap files than can be encoded in the kernel
+ * the PTEs.
+ */
+#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
+
+/*
+ * Encode and decode a file entry:
+ *      bits 0-1:       present (must be zero)
+ *      bit  2:         PTE_FILE
+ *      bits 3-63:      file offset / PAGE_SIZE
+ */
+#define pte_file(pte)           (pte_val(pte) & PTE_FILE)
+#define pte_to_pgoff(x)         (pte_val(x) >> 3)
+#define pgoff_to_pte(x)         __pte(((x) << 3) | PTE_FILE)
+
+#define PTE_FILE_MAX_BITS       61
+
+extern int kern_addr_valid(unsigned long addr);
+
+#include <asm-generic/pgtable.h>
+
+/*
+ * remap a physical page `pfn' of size `size' with page protection `prot'
+ * into virtual address `from'
+ */
+#define io_remap_pfn_range(vma,from,pfn,size,prot) \
+                remap_pfn_range(vma, from, pfn, size, prot)
+
+#define pgtable_cache_init() do { } while (0)
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __ASM_PGTABLE_H */
diff --git a/arch/arm64/include/asm/pmu.h b/arch/arm64/include/asm/pmu.h
new file mode 100644
index 00000000000..e6f087806aa
--- /dev/null
+++ b/arch/arm64/include/asm/pmu.h
@@ -0,0 +1,82 @@
+/*
+ * Based on arch/arm/include/asm/pmu.h
+ *
+ * Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PMU_H
+#define __ASM_PMU_H
+
+#ifdef CONFIG_HW_PERF_EVENTS
+
+/* The events for a given PMU register set. */
+struct pmu_hw_events {
+        /*
+         * The events that are active on the PMU for the given index.
+         */
+        struct perf_event       **events;
+
+        /*
+         * A 1 bit for an index indicates that the counter is being used for
+         * an event. A 0 means that the counter can be used.
+         */
+        unsigned long           *used_mask;
+
+        /*
+         * Hardware lock to serialize accesses to PMU registers. Needed for the
+         * read/modify/write sequences.
+         */
+        raw_spinlock_t          pmu_lock;
+};
+
+struct arm_pmu {
+        struct pmu              pmu;
+        cpumask_t               active_irqs;
+        const char              *name;
+        irqreturn_t             (*handle_irq)(int irq_num, void *dev);
+        void                    (*enable)(struct hw_perf_event *evt, int idx);
+        void                    (*disable)(struct hw_perf_event *evt, int idx);
+        int                     (*get_event_idx)(struct pmu_hw_events *hw_events,
+                                                 struct hw_perf_event *hwc);
+        int                     (*set_event_filter)(struct hw_perf_event *evt,
+                                                    struct perf_event_attr *attr);
+        u32                     (*read_counter)(int idx);
+        void                    (*write_counter)(int idx, u32 val);
+        void                    (*start)(void);
+        void                    (*stop)(void);
+        void                    (*reset)(void *);
+        int                     (*map_event)(struct perf_event *event);
+        int                     num_events;
+        atomic_t                active_events;
+        struct mutex            reserve_mutex;
+        u64                     max_period;
+        struct platform_device  *plat_device;
+        struct pmu_hw_events    *(*get_hw_events)(void);
+};
+
+#define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu))
+
+int __init armpmu_register(struct arm_pmu *armpmu, char *name, int type);
+
+u64 armpmu_event_update(struct perf_event *event,
+                        struct hw_perf_event *hwc,
+                        int idx);
+
+int armpmu_event_set_period(struct perf_event *event,
+                            struct hw_perf_event *hwc,
+                            int idx);
+
+#endif /* CONFIG_HW_PERF_EVENTS */
+#endif /* __ASM_PMU_H */
diff --git a/arch/arm64/include/asm/proc-fns.h b/arch/arm64/include/asm/proc-fns.h
new file mode 100644
index 00000000000..7cdf466fd0c
--- /dev/null
+++ b/arch/arm64/include/asm/proc-fns.h
@@ -0,0 +1,50 @@
+/*
+ * Based on arch/arm/include/asm/proc-fns.h
+ *
+ * Copyright (C) 1997-1999 Russell King
+ * Copyright (C) 2000 Deep Blue Solutions Ltd
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PROCFNS_H
+#define __ASM_PROCFNS_H
+
+#ifdef __KERNEL__
+#ifndef __ASSEMBLY__
+
+#include <asm/page.h>
+
+struct mm_struct;
+
+extern void cpu_cache_off(void);
+extern void cpu_do_idle(void);
+extern void cpu_do_switch_mm(unsigned long pgd_phys, struct mm_struct *mm);
+extern void cpu_reset(unsigned long addr) __attribute__((noreturn));
+
+#include <asm/memory.h>
+
+#define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)
+
+#define cpu_get_pgd()                                   \
+({                                                      \
+        unsigned long pg;                               \
+        asm("mrs        %0, ttbr0_el1\n"                \
+            : "=r" (pg));                               \
+        pg &= ~0xffff000000003ffful;                    \
+        (pgd_t *)phys_to_virt(pg);                      \
+})
+
+#endif /* __ASSEMBLY__ */
+#endif /* __KERNEL__ */
+#endif /* __ASM_PROCFNS_H */
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
new file mode 100644
index 00000000000..39a208a392f
--- /dev/null
+++ b/arch/arm64/include/asm/processor.h
@@ -0,0 +1,175 @@
+/*
+ * Based on arch/arm/include/asm/processor.h
+ *
+ * Copyright (C) 1995-1999 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PROCESSOR_H
+#define __ASM_PROCESSOR_H
+
+/*
+ * Default implementation of macro that returns current
+ * instruction pointer ("program counter").
+ */
+#define current_text_addr() ({ __label__ _l; _l: &&_l;})
+
+#ifdef __KERNEL__
+
+#include <linux/string.h>
+
+#include <asm/fpsimd.h>
+#include <asm/hw_breakpoint.h>
+#include <asm/ptrace.h>
+#include <asm/types.h>
+
+#ifdef __KERNEL__
+#define STACK_TOP_MAX           TASK_SIZE_64
+#ifdef CONFIG_COMPAT
+#define AARCH32_VECTORS_BASE    0xffff0000
+#define STACK_TOP               (test_thread_flag(TIF_32BIT) ? \
+                                AARCH32_VECTORS_BASE : STACK_TOP_MAX)
+#else
+#define STACK_TOP               STACK_TOP_MAX
+#endif /* CONFIG_COMPAT */
+#endif /* __KERNEL__ */
+
+struct debug_info {
+        /* Have we suspended stepping by a debugger? */
+        int                     suspended_step;
+        /* Allow breakpoints and watchpoints to be disabled for this thread. */
+        int                     bps_disabled;
+        int                     wps_disabled;
+        /* Hardware breakpoints pinned to this task. */
+        struct perf_event       *hbp_break[ARM_MAX_BRP];
+        struct perf_event       *hbp_watch[ARM_MAX_WRP];
+};
+
+struct cpu_context {
+        unsigned long x19;
+        unsigned long x20;
+        unsigned long x21;
+        unsigned long x22;
+        unsigned long x23;
+        unsigned long x24;
+        unsigned long x25;
+        unsigned long x26;
+        unsigned long x27;
+        unsigned long x28;
+        unsigned long fp;
+        unsigned long sp;
+        unsigned long pc;
+};
+
+struct thread_struct {
+        struct cpu_context      cpu_context;    /* cpu context */
+        unsigned long           tp_value;
+        struct fpsimd_state     fpsimd_state;
+        unsigned long           fault_address;  /* fault info */
+        struct debug_info       debug;          /* debugging */
+};
+
+#define INIT_THREAD  {  }
+
+static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
+{
+        memset(regs, 0, sizeof(*regs));
+        regs->syscallno = ~0UL;
+        regs->pc = pc;
+}
+
+static inline void start_thread(struct pt_regs *regs, unsigned long pc,
+                                unsigned long sp)
+{
+        unsigned long *stack = (unsigned long *)sp;
+
+        start_thread_common(regs, pc);
+        regs->pstate = PSR_MODE_EL0t;
+        regs->sp = sp;
+        regs->regs[2] = stack[2];       /* x2 (envp) */
+        regs->regs[1] = stack[1];       /* x1 (argv) */
+        regs->regs[0] = stack[0];       /* x0 (argc) */
+}
+
+#ifdef CONFIG_COMPAT
+static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
+                                       unsigned long sp)
+{
+        unsigned int *stack = (unsigned int *)sp;
+
+        start_thread_common(regs, pc);
+        regs->pstate = COMPAT_PSR_MODE_USR;
+        if (pc & 1)
+                regs->pstate |= COMPAT_PSR_T_BIT;
+        regs->compat_sp = sp;
+        regs->regs[2] = stack[2];       /* x2 (envp) */
+        regs->regs[1] = stack[1];       /* x1 (argv) */
+        regs->regs[0] = stack[0];       /* x0 (argc) */
+}
+#endif
+
+/* Forward declaration, a strange C thing */
+struct task_struct;
+
+/* Free all resources held by a thread. */
+extern void release_thread(struct task_struct *);
+
+/* Prepare to copy thread state - unlazy all lazy status */
+#define prepare_to_copy(tsk)    do { } while (0)
+
+unsigned long get_wchan(struct task_struct *p);
+
+#define cpu_relax()                     barrier()
+
+/* Thread switching */
+extern struct task_struct *cpu_switch_to(struct task_struct *prev,
+                                         struct task_struct *next);
+
+/*
+ * Create a new kernel thread
+ */
+extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
+
+#define task_pt_regs(p) \
+        ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
+
+#define KSTK_EIP(tsk)   task_pt_regs(tsk)->pc
+#define KSTK_ESP(tsk)   task_pt_regs(tsk)->sp
+
+/*
+ * Prefetching support
+ */
+#define ARCH_HAS_PREFETCH
+static inline void prefetch(const void *ptr)
+{
+        asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr));
+}
+
+#define ARCH_HAS_PREFETCHW
+static inline void prefetchw(const void *ptr)
+{
+        asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr));
+}
+
+#define ARCH_HAS_SPINLOCK_PREFETCH
+static inline void spin_lock_prefetch(const void *x)
+{
+        prefetchw(x);
+}
+
+#define HAVE_ARCH_PICK_MMAP_LAYOUT
+
+#endif
+
+#endif /* __ASM_PROCESSOR_H */
diff --git a/arch/arm64/include/asm/prom.h b/arch/arm64/include/asm/prom.h
new file mode 100644
index 00000000000..68b90e68295
--- /dev/null
+++ b/arch/arm64/include/asm/prom.h
@@ -0,0 +1 @@
+/* Empty for now */
diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
new file mode 100644
index 00000000000..0fa5d6c9ef7
--- /dev/null
+++ b/arch/arm64/include/asm/ptrace.h
@@ -0,0 +1,207 @@
+/*
+ * Based on arch/arm/include/asm/ptrace.h
+ *
+ * Copyright (C) 1996-2003 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_PTRACE_H
+#define __ASM_PTRACE_H
+
+#include <linux/types.h>
+
+#include <asm/hwcap.h>
+
+/* AArch32-specific ptrace requests */
+#define COMPAT_PTRACE_GETREGS           12
+#define COMPAT_PTRACE_SETREGS           13
+#define COMPAT_PTRACE_GET_THREAD_AREA   22
+#define COMPAT_PTRACE_SET_SYSCALL       23
+#define COMPAT_PTRACE_GETVFPREGS        27
+#define COMPAT_PTRACE_SETVFPREGS        28
+#define COMPAT_PTRACE_GETHBPREGS        29
+#define COMPAT_PTRACE_SETHBPREGS        30
+
+/*
+ * PSR bits
+ */
+#define PSR_MODE_EL0t   0x00000000
+#define PSR_MODE_EL1t   0x00000004
+#define PSR_MODE_EL1h   0x00000005
+#define PSR_MODE_EL2t   0x00000008
+#define PSR_MODE_EL2h   0x00000009
+#define PSR_MODE_EL3t   0x0000000c
+#define PSR_MODE_EL3h   0x0000000d
+#define PSR_MODE_MASK   0x0000000f
+
+/* AArch32 CPSR bits */
+#define PSR_MODE32_BIT          0x00000010
+#define COMPAT_PSR_MODE_USR     0x00000010
+#define COMPAT_PSR_T_BIT        0x00000020
+#define COMPAT_PSR_IT_MASK      0x0600fc00      /* If-Then execution state mask */
+
+/* AArch64 SPSR bits */
+#define PSR_F_BIT       0x00000040
+#define PSR_I_BIT       0x00000080
+#define PSR_A_BIT       0x00000100
+#define PSR_D_BIT       0x00000200
+#define PSR_Q_BIT       0x08000000
+#define PSR_V_BIT       0x10000000
+#define PSR_C_BIT       0x20000000
+#define PSR_Z_BIT       0x40000000
+#define PSR_N_BIT       0x80000000
+
+/*
+ * Groups of PSR bits
+ */
+#define PSR_f           0xff000000      /* Flags                */
+#define PSR_s           0x00ff0000      /* Status               */
+#define PSR_x           0x0000ff00      /* Extension            */
+#define PSR_c           0x000000ff      /* Control              */
+
+/*
+ * These are 'magic' values for PTRACE_PEEKUSR that return info about where a
+ * process is located in memory.
+ */
+#define PT_TEXT_ADDR            0x10000
+#define PT_DATA_ADDR            0x10004
+#define PT_TEXT_END_ADDR        0x10008
+
+#ifndef __ASSEMBLY__
+
+/*
+ * User structures for general purpose, floating point and debug registers.
+ */
+struct user_pt_regs {
+        __u64           regs[31];
+        __u64           sp;
+        __u64           pc;
+        __u64           pstate;
+};
+
+struct user_fpsimd_state {
+        __uint128_t     vregs[32];
+        __u32           fpsr;
+        __u32           fpcr;
+};
+
+struct user_hwdebug_state {
+        __u32           dbg_info;
+        struct {
+                __u64   addr;
+                __u32   ctrl;
+        }               dbg_regs[16];
+};
+
+#ifdef __KERNEL__
+
+/* sizeof(struct user) for AArch32 */
+#define COMPAT_USER_SZ  296
+/* AArch32 uses x13 as the stack pointer... */
+#define compat_sp       regs[13]
+/* ... and x14 as the link register. */
+#define compat_lr       regs[14]
+
+/*
+ * This struct defines the way the registers are stored on the stack during an
+ * exception. Note that sizeof(struct pt_regs) has to be a multiple of 16 (for
+ * stack alignment). struct user_pt_regs must form a prefix of struct pt_regs.
+ */
+struct pt_regs {
+        union {
+                struct user_pt_regs user_regs;
+                struct {
+                        u64 regs[31];
+                        u64 sp;
+                        u64 pc;
+                        u64 pstate;
+                };
+        };
+        u64 orig_x0;
+        u64 syscallno;
+};
+
+#define arch_has_single_step()  (1)
+
+#ifdef CONFIG_COMPAT
+#define compat_thumb_mode(regs) \
+        (((regs)->pstate & COMPAT_PSR_T_BIT))
+#else
+#define compat_thumb_mode(regs) (0)
+#endif
+
+#define user_mode(regs) \
+        (((regs)->pstate & PSR_MODE_MASK) == PSR_MODE_EL0t)
+
+#define compat_user_mode(regs)  \
+        (((regs)->pstate & (PSR_MODE32_BIT | PSR_MODE_MASK)) == \
+         (PSR_MODE32_BIT | PSR_MODE_EL0t))
+
+#define processor_mode(regs) \
+        ((regs)->pstate & PSR_MODE_MASK)
+
+#define interrupts_enabled(regs) \
+        (!((regs)->pstate & PSR_I_BIT))
+
+#define fast_interrupts_enabled(regs) \
+        (!((regs)->pstate & PSR_F_BIT))
+
+#define user_stack_pointer(regs) \
+        ((regs)->sp)
+
+/*
+ * Are the current registers suitable for user mode? (used to maintain
+ * security in signal handlers)
+ */
+static inline int valid_user_regs(struct user_pt_regs *regs)
+{
+        if (user_mode(regs) && (regs->pstate & PSR_I_BIT) == 0) {
+                regs->pstate &= ~(PSR_F_BIT | PSR_A_BIT);
+
+                /* The T bit is reserved for AArch64 */
+                if (!(regs->pstate & PSR_MODE32_BIT))
+                        regs->pstate &= ~COMPAT_PSR_T_BIT;
+
+                return 1;
+        }
+
+        /*
+         * Force PSR to something logical...
+         */
+        regs->pstate &= PSR_f | PSR_s | (PSR_x & ~PSR_A_BIT) | \
+                        COMPAT_PSR_T_BIT | PSR_MODE32_BIT;
+
+        if (!(regs->pstate & PSR_MODE32_BIT)) {
+                regs->pstate &= ~COMPAT_PSR_T_BIT;
+                regs->pstate |= PSR_MODE_EL0t;
+        }
+
+        return 0;
+}
+
+#define instruction_pointer(regs)       (regs)->pc
+
+#ifdef CONFIG_SMP
+extern unsigned long profile_pc(struct pt_regs *regs);
+#else
+#define profile_pc(regs) instruction_pointer(regs)
+#endif
+
+extern int aarch32_break_trap(struct pt_regs *regs);
+
+#endif /* __KERNEL__ */
+
+#endif /* __ASSEMBLY__ */
+
+#endif
diff --git a/arch/arm64/include/asm/setup.h b/arch/arm64/include/asm/setup.h
new file mode 100644
index 00000000000..9cf2e46fbbd
--- /dev/null
+++ b/arch/arm64/include/asm/setup.h
@@ -0,0 +1,26 @@
+/*
+ * Based on arch/arm/include/asm/setup.h
+ *
+ * Copyright (C) 1997-1999 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SETUP_H
+#define __ASM_SETUP_H
+
+#include <linux/types.h>
+
+#define COMMAND_LINE_SIZE       2048
+
+#endif
diff --git a/arch/arm64/include/asm/shmparam.h b/arch/arm64/include/asm/shmparam.h
new file mode 100644
index 00000000000..4df608a8459
--- /dev/null
+++ b/arch/arm64/include/asm/shmparam.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SHMPARAM_H
+#define __ASM_SHMPARAM_H
+
+/*
+ * For IPC syscalls from compat tasks, we need to use the legacy 16k
+ * alignment value. Since we don't have aliasing D-caches, the rest of
+ * the time we can safely use PAGE_SIZE.
+ */
+#define COMPAT_SHMLBA   0x4000
+
+#include <asm-generic/shmparam.h>
+
+#endif /* __ASM_SHMPARAM_H */
diff --git a/arch/arm64/include/asm/sigcontext.h b/arch/arm64/include/asm/sigcontext.h
new file mode 100644
index 00000000000..573cec77881
--- /dev/null
+++ b/arch/arm64/include/asm/sigcontext.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SIGCONTEXT_H
+#define __ASM_SIGCONTEXT_H
+
+#include <linux/types.h>
+
+/*
+ * Signal context structure - contains all info to do with the state
+ * before the signal handler was invoked.
+ */
+struct sigcontext {
+        __u64 fault_address;
+        /* AArch64 registers */
+        __u64 regs[31];
+        __u64 sp;
+        __u64 pc;
+        __u64 pstate;
+        /* 4K reserved for FP/SIMD state and future expansion */
+        __u8 __reserved[4096] __attribute__((__aligned__(16)));
+};
+
+/*
+ * Header to be used at the beginning of structures extending the user
+ * context. Such structures must be placed after the rt_sigframe on the stack
+ * and be 16-byte aligned. The last structure must be a dummy one with the
+ * magic and size set to 0.
+ */
+struct _aarch64_ctx {
+        __u32 magic;
+        __u32 size;
+};
+
+#define FPSIMD_MAGIC    0x46508001
+
+struct fpsimd_context {
+        struct _aarch64_ctx head;
+        __u32 fpsr;
+        __u32 fpcr;
+        __uint128_t vregs[32];
+};
+
+#ifdef __KERNEL__
+/*
+ * Auxiliary context saved in the sigcontext.__reserved array. Not exported to
+ * user space as it will change with the addition of new context. User space
+ * should check the magic/size information.
+ */
+struct aux_context {
+        struct fpsimd_context fpsimd;
+        /* additional context to be added before "end" */
+        struct _aarch64_ctx end;
+};
+#endif
+
+#endif
diff --git a/arch/arm64/include/asm/siginfo.h b/arch/arm64/include/asm/siginfo.h
new file mode 100644
index 00000000000..5a74a0853db
--- /dev/null
+++ b/arch/arm64/include/asm/siginfo.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SIGINFO_H
+#define __ASM_SIGINFO_H
+
+#define __ARCH_SI_PREAMBLE_SIZE (4 * sizeof(int))
+
+#include <asm-generic/siginfo.h>
+
+#endif
diff --git a/arch/arm64/include/asm/signal.h b/arch/arm64/include/asm/signal.h
new file mode 100644
index 00000000000..8d1e7236431
--- /dev/null
+++ b/arch/arm64/include/asm/signal.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SIGNAL_H
+#define __ASM_SIGNAL_H
+
+/* Required for AArch32 compatibility. */
+#define SA_RESTORER     0x04000000
+
+#include <asm-generic/signal.h>
+
+#endif
diff --git a/arch/arm64/include/asm/signal32.h b/arch/arm64/include/asm/signal32.h
new file mode 100644
index 00000000000..7c275e3b640
--- /dev/null
+++ b/arch/arm64/include/asm/signal32.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SIGNAL32_H
+#define __ASM_SIGNAL32_H
+
+#ifdef __KERNEL__
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+
+#define AARCH32_KERN_SIGRET_CODE_OFFSET 0x500
+
+extern const compat_ulong_t aarch32_sigret_code[6];
+
+int compat_setup_frame(int usig, struct k_sigaction *ka, sigset_t *set,
+                       struct pt_regs *regs);
+int compat_setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
+                          sigset_t *set, struct pt_regs *regs);
+
+void compat_setup_restart_syscall(struct pt_regs *regs);
+#else
+
+static inline int compat_setup_frame(int usid, struct k_sigaction *ka,
+                                     sigset_t *set, struct pt_regs *regs)
+{
+        return -ENOSYS;
+}
+
+static inline int compat_setup_rt_frame(int usig, struct k_sigaction *ka,
+                                        siginfo_t *info, sigset_t *set,
+                                        struct pt_regs *regs)
+{
+        return -ENOSYS;
+}
+
+static inline void compat_setup_restart_syscall(struct pt_regs *regs)
+{
+}
+#endif /* CONFIG_COMPAT */
+#endif /* __KERNEL__ */
+#endif /* __ASM_SIGNAL32_H */
diff --git a/arch/arm64/include/asm/smp.h b/arch/arm64/include/asm/smp.h
new file mode 100644
index 00000000000..7e34295f78e
--- /dev/null
+++ b/arch/arm64/include/asm/smp.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SMP_H
+#define __ASM_SMP_H
+
+#include <linux/threads.h>
+#include <linux/cpumask.h>
+#include <linux/thread_info.h>
+
+#ifndef CONFIG_SMP
+# error "<asm/smp.h> included in non-SMP build"
+#endif
+
+#define raw_smp_processor_id() (current_thread_info()->cpu)
+
+struct seq_file;
+
+/*
+ * generate IPI list text
+ */
+extern void show_ipi_list(struct seq_file *p, int prec);
+
+/*
+ * Called from C code, this handles an IPI.
+ */
+extern void handle_IPI(int ipinr, struct pt_regs *regs);
+
+/*
+ * Setup the set of possible CPUs (via set_cpu_possible)
+ */
+extern void smp_init_cpus(void);
+
+/*
+ * Provide a function to raise an IPI cross call on CPUs in callmap.
+ */
+extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
+
+/*
+ * Called from the secondary holding pen, this is the secondary CPU entry point.
+ */
+asmlinkage void secondary_start_kernel(void);
+
+/*
+ * Initial data for bringing up a secondary CPU.
+ */
+struct secondary_data {
+        void *stack;
+};
+extern struct secondary_data secondary_data;
+extern void secondary_holding_pen(void);
+extern volatile unsigned long secondary_holding_pen_release;
+
+extern void arch_send_call_function_single_ipi(int cpu);
+extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
+
+#endif /* ifndef __ASM_SMP_H */
diff --git a/arch/arm64/include/asm/sparsemem.h b/arch/arm64/include/asm/sparsemem.h
new file mode 100644
index 00000000000..1be62bcb9d4
--- /dev/null
+++ b/arch/arm64/include/asm/sparsemem.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SPARSEMEM_H
+#define __ASM_SPARSEMEM_H
+
+#ifdef CONFIG_SPARSEMEM
+#define MAX_PHYSMEM_BITS        40
+#define SECTION_SIZE_BITS       30
+#endif
+
+#endif
diff --git a/arch/arm64/include/asm/spinlock.h b/arch/arm64/include/asm/spinlock.h
new file mode 100644
index 00000000000..41112fe2f8b
--- /dev/null
+++ b/arch/arm64/include/asm/spinlock.h
@@ -0,0 +1,202 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SPINLOCK_H
+#define __ASM_SPINLOCK_H
+
+#include <asm/spinlock_types.h>
+#include <asm/processor.h>
+
+/*
+ * Spinlock implementation.
+ *
+ * The old value is read exclusively and the new one, if unlocked, is written
+ * exclusively. In case of failure, the loop is restarted.
+ *
+ * The memory barriers are implicit with the load-acquire and store-release
+ * instructions.
+ *
+ * Unlocked value: 0
+ * Locked value: 1
+ */
+
+#define arch_spin_is_locked(x)          ((x)->lock != 0)
+#define arch_spin_unlock_wait(lock) \
+        do { while (arch_spin_is_locked(lock)) cpu_relax(); } while (0)
+
+#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
+
+static inline void arch_spin_lock(arch_spinlock_t *lock)
+{
+        unsigned int tmp;
+
+        asm volatile(
+        "       sevl\n"
+        "1:     wfe\n"
+        "2:     ldaxr   %w0, [%1]\n"
+        "       cbnz    %w0, 1b\n"
+        "       stxr    %w0, %w2, [%1]\n"
+        "       cbnz    %w0, 2b\n"
+        : "=&r" (tmp)
+        : "r" (&lock->lock), "r" (1)
+        : "memory");
+}
+
+static inline int arch_spin_trylock(arch_spinlock_t *lock)
+{
+        unsigned int tmp;
+
+        asm volatile(
+        "       ldaxr   %w0, [%1]\n"
+        "       cbnz    %w0, 1f\n"
+        "       stxr    %w0, %w2, [%1]\n"
+        "1:\n"
+        : "=&r" (tmp)
+        : "r" (&lock->lock), "r" (1)
+        : "memory");
+
+        return !tmp;
+}
+
+static inline void arch_spin_unlock(arch_spinlock_t *lock)
+{
+        asm volatile(
+        "       stlr    %w1, [%0]\n"
+        : : "r" (&lock->lock), "r" (0) : "memory");
+}
+
+/*
+ * Write lock implementation.
+ *
+ * Write locks set bit 31. Unlocking, is done by writing 0 since the lock is
+ * exclusively held.
+ *
+ * The memory barriers are implicit with the load-acquire and store-release
+ * instructions.
+ */
+
+static inline void arch_write_lock(arch_rwlock_t *rw)
+{
+        unsigned int tmp;
+
+        asm volatile(
+        "       sevl\n"
+        "1:     wfe\n"
+        "2:     ldaxr   %w0, [%1]\n"
+        "       cbnz    %w0, 1b\n"
+        "       stxr    %w0, %w2, [%1]\n"
+        "       cbnz    %w0, 2b\n"
+        : "=&r" (tmp)
+        : "r" (&rw->lock), "r" (0x80000000)
+        : "memory");
+}
+
+static inline int arch_write_trylock(arch_rwlock_t *rw)
+{
+        unsigned int tmp;
+
+        asm volatile(
+        "       ldaxr   %w0, [%1]\n"
+        "       cbnz    %w0, 1f\n"
+        "       stxr    %w0, %w2, [%1]\n"
+        "1:\n"
+        : "=&r" (tmp)
+        : "r" (&rw->lock), "r" (0x80000000)
+        : "memory");
+
+        return !tmp;
+}
+
+static inline void arch_write_unlock(arch_rwlock_t *rw)
+{
+        asm volatile(
+        "       stlr    %w1, [%0]\n"
+        : : "r" (&rw->lock), "r" (0) : "memory");
+}
+
+/* write_can_lock - would write_trylock() succeed? */
+#define arch_write_can_lock(x)          ((x)->lock == 0)
+
+/*
+ * Read lock implementation.
+ *
+ * It exclusively loads the lock value, increments it and stores the new value
+ * back if positive and the CPU still exclusively owns the location. If the
+ * value is negative, the lock is already held.
+ *
+ * During unlocking there may be multiple active read locks but no write lock.
+ *
+ * The memory barriers are implicit with the load-acquire and store-release
+ * instructions.
+ */
+static inline void arch_read_lock(arch_rwlock_t *rw)
+{
+        unsigned int tmp, tmp2;
+
+        asm volatile(
+        "       sevl\n"
+        "1:     wfe\n"
+        "2:     ldaxr   %w0, [%2]\n"
+        "       add     %w0, %w0, #1\n"
+        "       tbnz    %w0, #31, 1b\n"
+        "       stxr    %w1, %w0, [%2]\n"
+        "       cbnz    %w1, 2b\n"
+        : "=&r" (tmp), "=&r" (tmp2)
+        : "r" (&rw->lock)
+        : "memory");
+}
+
+static inline void arch_read_unlock(arch_rwlock_t *rw)
+{
+        unsigned int tmp, tmp2;
+
+        asm volatile(
+        "1:     ldxr    %w0, [%2]\n"
+        "       sub     %w0, %w0, #1\n"
+        "       stlxr   %w1, %w0, [%2]\n"
+        "       cbnz    %w1, 1b\n"
+        : "=&r" (tmp), "=&r" (tmp2)
+        : "r" (&rw->lock)
+        : "memory");
+}
+
+static inline int arch_read_trylock(arch_rwlock_t *rw)
+{
+        unsigned int tmp, tmp2 = 1;
+
+        asm volatile(
+        "       ldaxr   %w0, [%2]\n"
+        "       add     %w0, %w0, #1\n"
+        "       tbnz    %w0, #31, 1f\n"
+        "       stxr    %w1, %w0, [%2]\n"
+        "1:\n"
+        : "=&r" (tmp), "+r" (tmp2)
+        : "r" (&rw->lock)
+        : "memory");
+
+        return !tmp2;
+}
+
+/* read_can_lock - would read_trylock() succeed? */
+#define arch_read_can_lock(x)           ((x)->lock < 0x80000000)
+
+#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
+#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
+
+#define arch_spin_relax(lock)   cpu_relax()
+#define arch_read_relax(lock)   cpu_relax()
+#define arch_write_relax(lock)  cpu_relax()
+
+#endif /* __ASM_SPINLOCK_H */
diff --git a/arch/arm64/include/asm/spinlock_types.h b/arch/arm64/include/asm/spinlock_types.h
new file mode 100644
index 00000000000..9a494346efe
--- /dev/null
+++ b/arch/arm64/include/asm/spinlock_types.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SPINLOCK_TYPES_H
+#define __ASM_SPINLOCK_TYPES_H
+
+#if !defined(__LINUX_SPINLOCK_TYPES_H) && !defined(__ASM_SPINLOCK_H)
+# error "please don't include this file directly"
+#endif
+
+/* We only require natural alignment for exclusive accesses. */
+#define __lock_aligned
+
+typedef struct {
+        volatile unsigned int lock;
+} arch_spinlock_t;
+
+#define __ARCH_SPIN_LOCK_UNLOCKED       { 0 }
+
+typedef struct {
+        volatile unsigned int lock;
+} arch_rwlock_t;
+
+#define __ARCH_RW_LOCK_UNLOCKED         { 0 }
+
+#endif
diff --git a/arch/arm64/include/asm/stacktrace.h b/arch/arm64/include/asm/stacktrace.h
new file mode 100644
index 00000000000..7318f6d54aa
--- /dev/null
+++ b/arch/arm64/include/asm/stacktrace.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_STACKTRACE_H
+#define __ASM_STACKTRACE_H
+
+struct stackframe {
+        unsigned long fp;
+        unsigned long sp;
+        unsigned long pc;
+};
+
+extern int unwind_frame(struct stackframe *frame);
+extern void walk_stackframe(struct stackframe *frame,
+                            int (*fn)(struct stackframe *, void *), void *data);
+
+#endif  /* __ASM_STACKTRACE_H */
diff --git a/arch/arm64/include/asm/stat.h b/arch/arm64/include/asm/stat.h
new file mode 100644
index 00000000000..d87225cbead
--- /dev/null
+++ b/arch/arm64/include/asm/stat.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_STAT_H
+#define __ASM_STAT_H
+
+#include <asm-generic/stat.h>
+
+#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
+
+#include <asm/compat.h>
+
+/*
+ * struct stat64 is needed for compat tasks only. Its definition is different
+ * from the generic struct stat64.
+ */
+struct stat64 {
+        compat_u64      st_dev;
+        unsigned char   __pad0[4];
+
+#define STAT64_HAS_BROKEN_ST_INO        1
+        compat_ulong_t  __st_ino;
+        compat_uint_t   st_mode;
+        compat_uint_t   st_nlink;
+
+        compat_ulong_t  st_uid;
+        compat_ulong_t  st_gid;
+
+        compat_u64      st_rdev;
+        unsigned char   __pad3[4];
+
+        compat_s64      st_size;
+        compat_ulong_t  st_blksize;
+        compat_u64      st_blocks;      /* Number of 512-byte blocks allocated. */
+
+        compat_ulong_t  st_atime;
+        compat_ulong_t  st_atime_nsec;
+
+        compat_ulong_t  st_mtime;
+        compat_ulong_t  st_mtime_nsec;
+
+        compat_ulong_t  st_ctime;
+        compat_ulong_t  st_ctime_nsec;
+
+        compat_u64      st_ino;
+};
+
+#endif
+
+#endif
diff --git a/arch/arm64/include/asm/statfs.h b/arch/arm64/include/asm/statfs.h
new file mode 100644
index 00000000000..6f621905097
--- /dev/null
+++ b/arch/arm64/include/asm/statfs.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_STATFS_H
+#define __ASM_STATFS_H
+
+#define ARCH_PACK_COMPAT_STATFS64 __attribute__((packed,aligned(4)))
+
+#include <asm-generic/statfs.h>
+
+#endif
diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h
new file mode 100644
index 00000000000..89c047f9a97
--- /dev/null
+++ b/arch/arm64/include/asm/syscall.h
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SYSCALL_H
+#define __ASM_SYSCALL_H
+
+#include <linux/err.h>
+
+
+static inline int syscall_get_nr(struct task_struct *task,
+                                 struct pt_regs *regs)
+{
+        return regs->syscallno;
+}
+
+static inline void syscall_rollback(struct task_struct *task,
+                                    struct pt_regs *regs)
+{
+        regs->regs[0] = regs->orig_x0;
+}
+
+
+static inline long syscall_get_error(struct task_struct *task,
+                                     struct pt_regs *regs)
+{
+        unsigned long error = regs->regs[0];
+        return IS_ERR_VALUE(error) ? error : 0;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+                                            struct pt_regs *regs)
+{
+        return regs->regs[0];
+}
+
+static inline void syscall_set_return_value(struct task_struct *task,
+                                            struct pt_regs *regs,
+                                            int error, long val)
+{
+        regs->regs[0] = (long) error ? error : val;
+}
+
+#define SYSCALL_MAX_ARGS 6
+
+static inline void syscall_get_arguments(struct task_struct *task,
+                                         struct pt_regs *regs,
+                                         unsigned int i, unsigned int n,
+                                         unsigned long *args)
+{
+        if (i + n > SYSCALL_MAX_ARGS) {
+                unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
+                unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
+                pr_warning("%s called with max args %d, handling only %d\n",
+                           __func__, i + n, SYSCALL_MAX_ARGS);
+                memset(args_bad, 0, n_bad * sizeof(args[0]));
+        }
+
+        if (i == 0) {
+                args[0] = regs->orig_x0;
+                args++;
+                i++;
+                n--;
+        }
+
+        memcpy(args, &regs->regs[i], n * sizeof(args[0]));
+}
+
+static inline void syscall_set_arguments(struct task_struct *task,
+                                         struct pt_regs *regs,
+                                         unsigned int i, unsigned int n,
+                                         const unsigned long *args)
+{
+        if (i + n > SYSCALL_MAX_ARGS) {
+                pr_warning("%s called with max args %d, handling only %d\n",
+                           __func__, i + n, SYSCALL_MAX_ARGS);
+                n = SYSCALL_MAX_ARGS - i;
+        }
+
+        if (i == 0) {
+                regs->orig_x0 = args[0];
+                args++;
+                i++;
+                n--;
+        }
+
+        memcpy(&regs->regs[i], args, n * sizeof(args[0]));
+}
+
+#endif  /* __ASM_SYSCALL_H */
diff --git a/arch/arm64/include/asm/syscalls.h b/arch/arm64/include/asm/syscalls.h
new file mode 100644
index 00000000000..09ff33572aa
--- /dev/null
+++ b/arch/arm64/include/asm/syscalls.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SYSCALLS_H
+#define __ASM_SYSCALLS_H
+
+#include <linux/linkage.h>
+#include <linux/compiler.h>
+#include <linux/signal.h>
+
+/*
+ * System call wrappers implemented in kernel/entry.S.
+ */
+asmlinkage long sys_execve_wrapper(const char __user *filename,
+                                   const char __user *const __user *argv,
+                                   const char __user *const __user *envp);
+asmlinkage long sys_clone_wrapper(unsigned long clone_flags,
+                                  unsigned long newsp,
+                                  void __user *parent_tid,
+                                  unsigned long tls_val,
+                                  void __user *child_tid);
+asmlinkage long sys_rt_sigreturn_wrapper(void);
+asmlinkage long sys_sigaltstack_wrapper(const stack_t __user *uss,
+                                        stack_t __user *uoss);
+
+#include <asm-generic/syscalls.h>
+
+#endif  /* __ASM_SYSCALLS_H */
diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
new file mode 100644
index 00000000000..95e40725534
--- /dev/null
+++ b/arch/arm64/include/asm/system_misc.h
@@ -0,0 +1,54 @@
+/*
+ * Based on arch/arm/include/asm/system_misc.h
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SYSTEM_MISC_H
+#define __ASM_SYSTEM_MISC_H
+
+#ifndef __ASSEMBLY__
+
+#include <linux/compiler.h>
+#include <linux/linkage.h>
+#include <linux/irqflags.h>
+
+struct pt_regs;
+
+void die(const char *msg, struct pt_regs *regs, int err);
+
+struct siginfo;
+void arm64_notify_die(const char *str, struct pt_regs *regs,
+                      struct siginfo *info, int err);
+
+void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
+                                             struct pt_regs *),
+                           int sig, int code, const char *name);
+
+struct mm_struct;
+extern void show_pte(struct mm_struct *mm, unsigned long addr);
+extern void __show_regs(struct pt_regs *);
+
+void soft_restart(unsigned long);
+extern void (*pm_restart)(const char *cmd);
+
+#define UDBG_UNDEFINED  (1 << 0)
+#define UDBG_SYSCALL    (1 << 1)
+#define UDBG_BADABORT   (1 << 2)
+#define UDBG_SEGV       (1 << 3)
+#define UDBG_BUS        (1 << 4)
+
+#endif  /* __ASSEMBLY__ */
+
+#endif  /* __ASM_SYSTEM_MISC_H */
diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
new file mode 100644
index 00000000000..3659e460071
--- /dev/null
+++ b/arch/arm64/include/asm/thread_info.h
@@ -0,0 +1,127 @@
+/*
+ * Based on arch/arm/include/asm/thread_info.h
+ *
+ * Copyright (C) 2002 Russell King.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_THREAD_INFO_H
+#define __ASM_THREAD_INFO_H
+
+#ifdef __KERNEL__
+
+#include <linux/compiler.h>
+
+#ifndef CONFIG_ARM64_64K_PAGES
+#define THREAD_SIZE_ORDER       1
+#endif
+
+#define THREAD_SIZE             8192
+#define THREAD_START_SP         (THREAD_SIZE - 16)
+
+#ifndef __ASSEMBLY__
+
+struct task_struct;
+struct exec_domain;
+
+#include <asm/types.h>
+
+typedef unsigned long mm_segment_t;
+
+/*
+ * low level task data that entry.S needs immediate access to.
+ * __switch_to() assumes cpu_context follows immediately after cpu_domain.
+ */
+struct thread_info {
+        unsigned long           flags;          /* low level flags */
+        mm_segment_t            addr_limit;     /* address limit */
+        struct task_struct      *task;          /* main task structure */
+        struct exec_domain      *exec_domain;   /* execution domain */
+        struct restart_block    restart_block;
+        int                     preempt_count;  /* 0 => preemptable, <0 => bug */
+        int                     cpu;            /* cpu */
+};
+
+#define INIT_THREAD_INFO(tsk)                                           \
+{                                                                       \
+        .task           = &tsk,                                         \
+        .exec_domain    = &default_exec_domain,                         \
+        .flags          = 0,                                            \
+        .preempt_count  = INIT_PREEMPT_COUNT,                           \
+        .addr_limit     = KERNEL_DS,                                    \
+        .restart_block  = {                                             \
+                .fn     = do_no_restart_syscall,                        \
+        },                                                              \
+}
+
+#define init_thread_info        (init_thread_union.thread_info)
+#define init_stack              (init_thread_union.stack)
+
+/*
+ * how to get the thread information struct from C
+ */
+static inline struct thread_info *current_thread_info(void) __attribute_const__;
+
+static inline struct thread_info *current_thread_info(void)
+{
+        register unsigned long sp asm ("sp");
+        return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
+}
+
+#define thread_saved_pc(tsk)    \
+        ((unsigned long)(tsk->thread.cpu_context.pc))
+#define thread_saved_sp(tsk)    \
+        ((unsigned long)(tsk->thread.cpu_context.sp))
+#define thread_saved_fp(tsk)    \
+        ((unsigned long)(tsk->thread.cpu_context.fp))
+
+#endif
+
+/*
+ * We use bit 30 of the preempt_count to indicate that kernel
+ * preemption is occurring.  See <asm/hardirq.h>.
+ */
+#define PREEMPT_ACTIVE  0x40000000
+
+/*
+ * thread information flags:
+ *  TIF_SYSCALL_TRACE   - syscall trace active
+ *  TIF_SIGPENDING      - signal pending
+ *  TIF_NEED_RESCHED    - rescheduling necessary
+ *  TIF_NOTIFY_RESUME   - callback before returning to user
+ *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
+ *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
+ */
+#define TIF_SIGPENDING          0
+#define TIF_NEED_RESCHED        1
+#define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
+#define TIF_SYSCALL_TRACE       8
+#define TIF_POLLING_NRFLAG      16
+#define TIF_MEMDIE              18      /* is terminating due to OOM killer */
+#define TIF_FREEZE              19
+#define TIF_RESTORE_SIGMASK     20
+#define TIF_SINGLESTEP          21
+#define TIF_32BIT               22      /* 32bit process */
+#define TIF_SWITCH_MM           23      /* deferred switch_mm */
+
+#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
+#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
+#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
+#define _TIF_32BIT              (1 << TIF_32BIT)
+
+#define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
+                                 _TIF_NOTIFY_RESUME)
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_THREAD_INFO_H */
diff --git a/arch/arm64/include/asm/timex.h b/arch/arm64/include/asm/timex.h
new file mode 100644
index 00000000000..b24a31a7e2c
--- /dev/null
+++ b/arch/arm64/include/asm/timex.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_TIMEX_H
+#define __ASM_TIMEX_H
+
+/*
+ * Use the current timer as a cycle counter since this is what we use for
+ * the delay loop.
+ */
+#define get_cycles()    ({ cycles_t c; read_current_timer(&c); c; })
+
+#include <asm-generic/timex.h>
+
+#define ARCH_HAS_READ_CURRENT_TIMER
+
+#endif
diff --git a/arch/arm64/include/asm/tlb.h b/arch/arm64/include/asm/tlb.h
new file mode 100644
index 00000000000..654f0968030
--- /dev/null
+++ b/arch/arm64/include/asm/tlb.h
@@ -0,0 +1,190 @@
+/*
+ * Based on arch/arm/include/asm/tlb.h
+ *
+ * Copyright (C) 2002 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_TLB_H
+#define __ASM_TLB_H
+
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+
+#include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
+
+#define MMU_GATHER_BUNDLE       8
+
+/*
+ * TLB handling.  This allows us to remove pages from the page
+ * tables, and efficiently handle the TLB issues.
+ */
+struct mmu_gather {
+        struct mm_struct        *mm;
+        unsigned int            fullmm;
+        struct vm_area_struct   *vma;
+        unsigned long           range_start;
+        unsigned long           range_end;
+        unsigned int            nr;
+        unsigned int            max;
+        struct page             **pages;
+        struct page             *local[MMU_GATHER_BUNDLE];
+};
+
+/*
+ * This is unnecessarily complex.  There's three ways the TLB shootdown
+ * code is used:
+ *  1. Unmapping a range of vmas.  See zap_page_range(), unmap_region().
+ *     tlb->fullmm = 0, and tlb_start_vma/tlb_end_vma will be called.
+ *     tlb->vma will be non-NULL.
+ *  2. Unmapping all vmas.  See exit_mmap().
+ *     tlb->fullmm = 1, and tlb_start_vma/tlb_end_vma will be called.
+ *     tlb->vma will be non-NULL.  Additionally, page tables will be freed.
+ *  3. Unmapping argument pages.  See shift_arg_pages().
+ *     tlb->fullmm = 0, but tlb_start_vma/tlb_end_vma will not be called.
+ *     tlb->vma will be NULL.
+ */
+static inline void tlb_flush(struct mmu_gather *tlb)
+{
+        if (tlb->fullmm || !tlb->vma)
+                flush_tlb_mm(tlb->mm);
+        else if (tlb->range_end > 0) {
+                flush_tlb_range(tlb->vma, tlb->range_start, tlb->range_end);
+                tlb->range_start = TASK_SIZE;
+                tlb->range_end = 0;
+        }
+}
+
+static inline void tlb_add_flush(struct mmu_gather *tlb, unsigned long addr)
+{
+        if (!tlb->fullmm) {
+                if (addr < tlb->range_start)
+                        tlb->range_start = addr;
+                if (addr + PAGE_SIZE > tlb->range_end)
+                        tlb->range_end = addr + PAGE_SIZE;
+        }
+}
+
+static inline void __tlb_alloc_page(struct mmu_gather *tlb)
+{
+        unsigned long addr = __get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0);
+
+        if (addr) {
+                tlb->pages = (void *)addr;
+                tlb->max = PAGE_SIZE / sizeof(struct page *);
+        }
+}
+
+static inline void tlb_flush_mmu(struct mmu_gather *tlb)
+{
+        tlb_flush(tlb);
+        free_pages_and_swap_cache(tlb->pages, tlb->nr);
+        tlb->nr = 0;
+        if (tlb->pages == tlb->local)
+                __tlb_alloc_page(tlb);
+}
+
+static inline void
+tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned int fullmm)
+{
+        tlb->mm = mm;
+        tlb->fullmm = fullmm;
+        tlb->vma = NULL;
+        tlb->max = ARRAY_SIZE(tlb->local);
+        tlb->pages = tlb->local;
+        tlb->nr = 0;
+        __tlb_alloc_page(tlb);
+}
+
+static inline void
+tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
+{
+        tlb_flush_mmu(tlb);
+
+        /* keep the page table cache within bounds */
+        check_pgt_cache();
+
+        if (tlb->pages != tlb->local)
+                free_pages((unsigned long)tlb->pages, 0);
+}
+
+/*
+ * Memorize the range for the TLB flush.
+ */
+static inline void
+tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long addr)
+{
+        tlb_add_flush(tlb, addr);
+}
+
+/*
+ * In the case of tlb vma handling, we can optimise these away in the
+ * case where we're doing a full MM flush.  When we're doing a munmap,
+ * the vmas are adjusted to only cover the region to be torn down.
+ */
+static inline void
+tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
+{
+        if (!tlb->fullmm) {
+                tlb->vma = vma;
+                tlb->range_start = TASK_SIZE;
+                tlb->range_end = 0;
+        }
+}
+
+static inline void
+tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
+{
+        if (!tlb->fullmm)
+                tlb_flush(tlb);
+}
+
+static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
+{
+        tlb->pages[tlb->nr++] = page;
+        VM_BUG_ON(tlb->nr > tlb->max);
+        return tlb->max - tlb->nr;
+}
+
+static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
+{
+        if (!__tlb_remove_page(tlb, page))
+                tlb_flush_mmu(tlb);
+}
+
+static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
+        unsigned long addr)
+{
+        pgtable_page_dtor(pte);
+        tlb_add_flush(tlb, addr);
+        tlb_remove_page(tlb, pte);
+}
+
+#ifndef CONFIG_ARM64_64K_PAGES
+static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
+                                  unsigned long addr)
+{
+        tlb_add_flush(tlb, addr);
+        tlb_remove_page(tlb, virt_to_page(pmdp));
+}
+#endif
+
+#define pte_free_tlb(tlb, ptep, addr)   __pte_free_tlb(tlb, ptep, addr)
+#define pmd_free_tlb(tlb, pmdp, addr)   __pmd_free_tlb(tlb, pmdp, addr)
+#define pud_free_tlb(tlb, pudp, addr)   pud_free((tlb)->mm, pudp)
+
+#define tlb_migrate_finish(mm)          do { } while (0)
+
+#endif
diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
new file mode 100644
index 00000000000..122d6320f74
--- /dev/null
+++ b/arch/arm64/include/asm/tlbflush.h
@@ -0,0 +1,122 @@
+/*
+ * Based on arch/arm/include/asm/tlbflush.h
+ *
+ * Copyright (C) 1999-2003 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_TLBFLUSH_H
+#define __ASM_TLBFLUSH_H
+
+#ifndef __ASSEMBLY__
+
+#include <linux/sched.h>
+#include <asm/cputype.h>
+
+extern void __cpu_flush_user_tlb_range(unsigned long, unsigned long, struct vm_area_struct *);
+extern void __cpu_flush_kern_tlb_range(unsigned long, unsigned long);
+
+extern struct cpu_tlb_fns cpu_tlb;
+
+/*
+ *      TLB Management
+ *      ==============
+ *
+ *      The arch/arm64/mm/tlb.S files implement these methods.
+ *
+ *      The TLB specific code is expected to perform whatever tests it needs
+ *      to determine if it should invalidate the TLB for each call.  Start
+ *      addresses are inclusive and end addresses are exclusive; it is safe to
+ *      round these addresses down.
+ *
+ *      flush_tlb_all()
+ *
+ *              Invalidate the entire TLB.
+ *
+ *      flush_tlb_mm(mm)
+ *
+ *              Invalidate all TLB entries in a particular address space.
+ *              - mm    - mm_struct describing address space
+ *
+ *      flush_tlb_range(mm,start,end)
+ *
+ *              Invalidate a range of TLB entries in the specified address
+ *              space.
+ *              - mm    - mm_struct describing address space
+ *              - start - start address (may not be aligned)
+ *              - end   - end address (exclusive, may not be aligned)
+ *
+ *      flush_tlb_page(vaddr,vma)
+ *
+ *              Invalidate the specified page in the specified address range.
+ *              - vaddr - virtual address (may not be aligned)
+ *              - vma   - vma_struct describing address range
+ *
+ *      flush_kern_tlb_page(kaddr)
+ *
+ *              Invalidate the TLB entry for the specified page.  The address
+ *              will be in the kernels virtual memory space.  Current uses
+ *              only require the D-TLB to be invalidated.
+ *              - kaddr - Kernel virtual memory address
+ */
+static inline void flush_tlb_all(void)
+{
+        dsb();
+        asm("tlbi       vmalle1is");
+        dsb();
+        isb();
+}
+
+static inline void flush_tlb_mm(struct mm_struct *mm)
+{
+        unsigned long asid = (unsigned long)ASID(mm) << 48;
+
+        dsb();
+        asm("tlbi       aside1is, %0" : : "r" (asid));
+        dsb();
+}
+
+static inline void flush_tlb_page(struct vm_area_struct *vma,
+                                  unsigned long uaddr)
+{
+        unsigned long addr = uaddr >> 12 |
+                ((unsigned long)ASID(vma->vm_mm) << 48);
+
+        dsb();
+        asm("tlbi       vae1is, %0" : : "r" (addr));
+        dsb();
+}
+
+/*
+ * Convert calls to our calling convention.
+ */
+#define flush_tlb_range(vma,start,end)  __cpu_flush_user_tlb_range(start,end,vma)
+#define flush_tlb_kernel_range(s,e)     __cpu_flush_kern_tlb_range(s,e)
+
+/*
+ * On AArch64, the cache coherency is handled via the set_pte_at() function.
+ */
+static inline void update_mmu_cache(struct vm_area_struct *vma,
+                                    unsigned long addr, pte_t *ptep)
+{
+        /*
+         * set_pte() does not have a DSB, so make sure that the page table
+         * write is visible.
+         */
+        dsb();
+}
+
+#endif
+
+#endif
diff --git a/arch/arm64/include/asm/traps.h b/arch/arm64/include/asm/traps.h
new file mode 100644
index 00000000000..10ca8ff93cc
--- /dev/null
+++ b/arch/arm64/include/asm/traps.h
@@ -0,0 +1,30 @@
+/*
+ * Based on arch/arm/include/asm/traps.h
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_TRAP_H
+#define __ASM_TRAP_H
+
+static inline int in_exception_text(unsigned long ptr)
+{
+        extern char __exception_text_start[];
+        extern char __exception_text_end[];
+
+        return ptr >= (unsigned long)&__exception_text_start &&
+               ptr < (unsigned long)&__exception_text_end;
+}
+
+#endif
diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h
new file mode 100644
index 00000000000..008f8481da6
--- /dev/null
+++ b/arch/arm64/include/asm/uaccess.h
@@ -0,0 +1,297 @@
+/*
+ * Based on arch/arm/include/asm/uaccess.h
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_UACCESS_H
+#define __ASM_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/string.h>
+#include <linux/thread_info.h>
+
+#include <asm/ptrace.h>
+#include <asm/errno.h>
+#include <asm/memory.h>
+#include <asm/compiler.h>
+
+#define VERIFY_READ 0
+#define VERIFY_WRITE 1
+
+/*
+ * The exception table consists of pairs of addresses: the first is the
+ * address of an instruction that is allowed to fault, and the second is
+ * the address at which the program should continue.  No registers are
+ * modified, so it is entirely up to the continuation code to figure out
+ * what to do.
+ *
+ * All the routines below use bits of fixup code that are out of line
+ * with the main instruction path.  This means when everything is well,
+ * we don't even have to jump over them.  Further, they do not intrude
+ * on our cache or tlb entries.
+ */
+
+struct exception_table_entry
+{
+        unsigned long insn, fixup;
+};
+
+extern int fixup_exception(struct pt_regs *regs);
+
+#define KERNEL_DS       (-1UL)
+#define get_ds()        (KERNEL_DS)
+
+#define USER_DS         TASK_SIZE_64
+#define get_fs()        (current_thread_info()->addr_limit)
+
+static inline void set_fs(mm_segment_t fs)
+{
+        current_thread_info()->addr_limit = fs;
+}
+
+#define segment_eq(a,b) ((a) == (b))
+
+/*
+ * Return 1 if addr < current->addr_limit, 0 otherwise.
+ */
+#define __addr_ok(addr)                                                 \
+({                                                                      \
+        unsigned long flag;                                             \
+        asm("cmp %1, %0; cset %0, lo"                                   \
+                : "=&r" (flag)                                          \
+                : "r" (addr), "0" (current_thread_info()->addr_limit)   \
+                : "cc");                                                \
+        flag;                                                           \
+})
+
+/*
+ * Test whether a block of memory is a valid user space address.
+ * Returns 1 if the range is valid, 0 otherwise.
+ *
+ * This is equivalent to the following test:
+ * (u65)addr + (u65)size < (u65)current->addr_limit
+ *
+ * This needs 65-bit arithmetic.
+ */
+#define __range_ok(addr, size)                                          \
+({                                                                      \
+        unsigned long flag, roksum;                                     \
+        __chk_user_ptr(addr);                                           \
+        asm("adds %1, %1, %3; ccmp %1, %4, #2, cc; cset %0, cc"         \
+                : "=&r" (flag), "=&r" (roksum)                          \
+                : "1" (addr), "Ir" (size),                              \
+                  "r" (current_thread_info()->addr_limit)               \
+                : "cc");                                                \
+        flag;                                                           \
+})
+
+#define access_ok(type, addr, size)     __range_ok(addr, size)
+
+/*
+ * The "__xxx" versions of the user access functions do not verify the address
+ * space - it must have been done previously with a separate "access_ok()"
+ * call.
+ *
+ * The "__xxx_error" versions set the third argument to -EFAULT if an error
+ * occurs, and leave it unchanged on success.
+ */
+#define __get_user_asm(instr, reg, x, addr, err)                        \
+        asm volatile(                                                   \
+        "1:     " instr "       " reg "1, [%2]\n"                       \
+        "2:\n"                                                          \
+        "       .section .fixup, \"ax\"\n"                              \
+        "       .align  2\n"                                            \
+        "3:     mov     %w0, %3\n"                                      \
+        "       mov     %1, #0\n"                                       \
+        "       b       2b\n"                                           \
+        "       .previous\n"                                            \
+        "       .section __ex_table,\"a\"\n"                            \
+        "       .align  3\n"                                            \
+        "       .quad   1b, 3b\n"                                       \
+        "       .previous"                                              \
+        : "+r" (err), "=&r" (x)                                         \
+        : "r" (addr), "i" (-EFAULT))
+
+#define __get_user_err(x, ptr, err)                                     \
+do {                                                                    \
+        unsigned long __gu_val;                                         \
+        __chk_user_ptr(ptr);                                            \
+        switch (sizeof(*(ptr))) {                                       \
+        case 1:                                                         \
+                __get_user_asm("ldrb", "%w", __gu_val, (ptr), (err));   \
+                break;                                                  \
+        case 2:                                                         \
+                __get_user_asm("ldrh", "%w", __gu_val, (ptr), (err));   \
+                break;                                                  \
+        case 4:                                                         \
+                __get_user_asm("ldr", "%w", __gu_val, (ptr), (err));    \
+                break;                                                  \
+        case 8:                                                         \
+                __get_user_asm("ldr", "%",  __gu_val, (ptr), (err));    \
+                break;                                                  \
+        default:                                                        \
+                BUILD_BUG();                                            \
+        }                                                               \
+        (x) = (__typeof__(*(ptr)))__gu_val;                             \
+} while (0)
+
+#define __get_user(x, ptr)                                              \
+({                                                                      \
+        int __gu_err = 0;                                               \
+        __get_user_err((x), (ptr), __gu_err);                           \
+        __gu_err;                                                       \
+})
+
+#define __get_user_error(x, ptr, err)                                   \
+({                                                                      \
+        __get_user_err((x), (ptr), (err));                              \
+        (void)0;                                                        \
+})
+
+#define __get_user_unaligned __get_user
+
+#define get_user(x, ptr)                                                \
+({                                                                      \
+        might_sleep();                                                  \
+        access_ok(VERIFY_READ, (ptr), sizeof(*(ptr))) ?                 \
+                __get_user((x), (ptr)) :                                \
+                ((x) = 0, -EFAULT);                                     \
+})
+
+#define __put_user_asm(instr, reg, x, addr, err)                        \
+        asm volatile(                                                   \
+        "1:     " instr "       " reg "1, [%2]\n"                       \
+        "2:\n"                                                          \
+        "       .section .fixup,\"ax\"\n"                               \
+        "       .align  2\n"                                            \
+        "3:     mov     %w0, %3\n"                                      \
+        "       b       2b\n"                                           \
+        "       .previous\n"                                            \
+        "       .section __ex_table,\"a\"\n"                            \
+        "       .align  3\n"                                            \
+        "       .quad   1b, 3b\n"                                       \
+        "       .previous"                                              \
+        : "+r" (err)                                                    \
+        : "r" (x), "r" (addr), "i" (-EFAULT))
+
+#define __put_user_err(x, ptr, err)                                     \
+do {                                                                    \
+        __typeof__(*(ptr)) __pu_val = (x);                              \
+        __chk_user_ptr(ptr);                                            \
+        switch (sizeof(*(ptr))) {                                       \
+        case 1:                                                         \
+                __put_user_asm("strb", "%w", __pu_val, (ptr), (err));   \
+                break;                                                  \
+        case 2:                                                         \
+                __put_user_asm("strh", "%w", __pu_val, (ptr), (err));   \
+                break;                                                  \
+        case 4:                                                         \
+                __put_user_asm("str",  "%w", __pu_val, (ptr), (err));   \
+                break;                                                  \
+        case 8:                                                         \
+                __put_user_asm("str",  "%", __pu_val, (ptr), (err));    \
+                break;                                                  \
+        default:                                                        \
+                BUILD_BUG();                                            \
+        }                                                               \
+} while (0)
+
+#define __put_user(x, ptr)                                              \
+({                                                                      \
+        int __pu_err = 0;                                               \
+        __put_user_err((x), (ptr), __pu_err);                           \
+        __pu_err;                                                       \
+})
+
+#define __put_user_error(x, ptr, err)                                   \
+({                                                                      \
+        __put_user_err((x), (ptr), (err));                              \
+        (void)0;                                                        \
+})
+
+#define __put_user_unaligned __put_user
+
+#define put_user(x, ptr)                                                \
+({                                                                      \
+        might_sleep();                                                  \
+        access_ok(VERIFY_WRITE, (ptr), sizeof(*(ptr))) ?                \
+                __put_user((x), (ptr)) :                                \
+                -EFAULT;                                                \
+})
+
+extern unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n);
+extern unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n);
+extern unsigned long __must_check __copy_in_user(void __user *to, const void __user *from, unsigned long n);
+extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
+
+extern unsigned long __must_check __strncpy_from_user(char *to, const char __user *from, unsigned long count);
+extern unsigned long __must_check __strnlen_user(const char __user *s, long n);
+
+static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+        if (access_ok(VERIFY_READ, from, n))
+                n = __copy_from_user(to, from, n);
+        else /* security hole - plug it */
+                memset(to, 0, n);
+        return n;
+}
+
+static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+        if (access_ok(VERIFY_WRITE, to, n))
+                n = __copy_to_user(to, from, n);
+        return n;
+}
+
+static inline unsigned long __must_check copy_in_user(void __user *to, const void __user *from, unsigned long n)
+{
+        if (access_ok(VERIFY_READ, from, n) && access_ok(VERIFY_WRITE, to, n))
+                n = __copy_in_user(to, from, n);
+        return n;
+}
+
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
+{
+        if (access_ok(VERIFY_WRITE, to, n))
+                n = __clear_user(to, n);
+        return n;
+}
+
+static inline long __must_check strncpy_from_user(char *dst, const char __user *src, long count)
+{
+        long res = -EFAULT;
+        if (access_ok(VERIFY_READ, src, 1))
+                res = __strncpy_from_user(dst, src, count);
+        return res;
+}
+
+#define strlen_user(s)  strnlen_user(s, ~0UL >> 1)
+
+static inline long __must_check strnlen_user(const char __user *s, long n)
+{
+        unsigned long res = 0;
+
+        if (__addr_ok(s))
+                res = __strnlen_user(s, n);
+
+        return res;
+}
+
+#endif /* __ASM_UACCESS_H */
diff --git a/arch/arm64/include/asm/ucontext.h b/arch/arm64/include/asm/ucontext.h
new file mode 100644
index 00000000000..bde96072089
--- /dev/null
+++ b/arch/arm64/include/asm/ucontext.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_UCONTEXT_H
+#define __ASM_UCONTEXT_H
+
+struct ucontext {
+        unsigned long     uc_flags;
+        struct ucontext  *uc_link;
+        stack_t           uc_stack;
+        sigset_t          uc_sigmask;
+        /* glibc uses a 1024-bit sigset_t */
+        __u8              __unused[(1024 - sizeof(sigset_t)) / 8];
+        /* last for future expansion */
+        struct sigcontext uc_mcontext;
+};
+
+#endif /* __ASM_UCONTEXT_H */
diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h
new file mode 100644
index 00000000000..fe18a683274
--- /dev/null
+++ b/arch/arm64/include/asm/unistd.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#if !defined(__ASM_UNISTD_H) || defined(__SYSCALL)
+#define __ASM_UNISTD_H
+
+#ifndef __SYSCALL_COMPAT
+#include <asm-generic/unistd.h>
+#endif
+
+#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
+#include <asm/unistd32.h>
+#endif
+
+#endif /* __ASM_UNISTD_H */
diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
new file mode 100644
index 00000000000..a50405f5ee4
--- /dev/null
+++ b/arch/arm64/include/asm/unistd32.h
@@ -0,0 +1,758 @@
+/*
+ * Based on arch/arm/include/asm/unistd.h
+ *
+ * Copyright (C) 2001-2005 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#if !defined(__ASM_UNISTD32_H) || defined(__SYSCALL)
+#define __ASM_UNISTD32_H
+
+#ifndef __SYSCALL
+#define __SYSCALL(x, y)
+#endif
+
+/*
+ * This file contains the system call numbers.
+ */
+
+#ifdef __SYSCALL_COMPAT
+
+#define __NR_restart_syscall            0
+__SYSCALL(__NR_restart_syscall, sys_restart_syscall)
+#define __NR_exit                       1
+__SYSCALL(__NR_exit, sys_exit)
+#define __NR_fork                       2
+__SYSCALL(__NR_fork, sys_fork)
+#define __NR_read                       3
+__SYSCALL(__NR_read, sys_read)
+#define __NR_write                      4
+__SYSCALL(__NR_write, sys_write)
+#define __NR_open                       5
+__SYSCALL(__NR_open, sys_open)
+#define __NR_close                      6
+__SYSCALL(__NR_close, sys_close)
+__SYSCALL(7, sys_ni_syscall)            /* 7 was sys_waitpid */
+#define __NR_creat                      8
+__SYSCALL(__NR_creat, sys_creat)
+#define __NR_link                       9
+__SYSCALL(__NR_link, sys_link)
+#define __NR_unlink                     10
+__SYSCALL(__NR_unlink, sys_unlink)
+#define __NR_execve                     11
+__SYSCALL(__NR_execve, sys_execve)
+#define __NR_chdir                      12
+__SYSCALL(__NR_chdir, sys_chdir)
+__SYSCALL(13, sys_ni_syscall)           /* 13 was sys_time */
+#define __NR_mknod                      14
+__SYSCALL(__NR_mknod, sys_mknod)
+#define __NR_chmod                      15
+__SYSCALL(__NR_chmod, sys_chmod)
+#define __NR_lchown                     16
+__SYSCALL(__NR_lchown, sys_lchown16)
+__SYSCALL(17, sys_ni_syscall)           /* 17 was sys_break */
+__SYSCALL(18, sys_ni_syscall)           /* 18 was sys_stat */
+#define __NR_lseek                      19
+__SYSCALL(__NR_lseek, sys_lseek)
+#define __NR_getpid                     20
+__SYSCALL(__NR_getpid, sys_getpid)
+#define __NR_mount                      21
+__SYSCALL(__NR_mount, sys_mount)
+__SYSCALL(22, sys_ni_syscall)           /* 22 was sys_umount */
+#define __NR_setuid                     23
+__SYSCALL(__NR_setuid, sys_setuid16)
+#define __NR_getuid                     24
+__SYSCALL(__NR_getuid, sys_getuid16)
+__SYSCALL(25, sys_ni_syscall)           /* 25 was sys_stime */
+#define __NR_ptrace                     26
+__SYSCALL(__NR_ptrace, sys_ptrace)
+__SYSCALL(27, sys_ni_syscall)           /* 27 was sys_alarm */
+__SYSCALL(28, sys_ni_syscall)           /* 28 was sys_fstat */
+#define __NR_pause                      29
+__SYSCALL(__NR_pause, sys_pause)
+__SYSCALL(30, sys_ni_syscall)           /* 30 was sys_utime */
+__SYSCALL(31, sys_ni_syscall)           /* 31 was sys_stty */
+__SYSCALL(32, sys_ni_syscall)           /* 32 was sys_gtty */
+#define __NR_access                     33
+__SYSCALL(__NR_access, sys_access)
+#define __NR_nice                       34
+__SYSCALL(__NR_nice, sys_nice)
+__SYSCALL(35, sys_ni_syscall)           /* 35 was sys_ftime */
+#define __NR_sync                       36
+__SYSCALL(__NR_sync, sys_sync)
+#define __NR_kill                       37
+__SYSCALL(__NR_kill, sys_kill)
+#define __NR_rename                     38
+__SYSCALL(__NR_rename, sys_rename)
+#define __NR_mkdir                      39
+__SYSCALL(__NR_mkdir, sys_mkdir)
+#define __NR_rmdir                      40
+__SYSCALL(__NR_rmdir, sys_rmdir)
+#define __NR_dup                        41
+__SYSCALL(__NR_dup, sys_dup)
+#define __NR_pipe                       42
+__SYSCALL(__NR_pipe, sys_pipe)
+#define __NR_times                      43
+__SYSCALL(__NR_times, sys_times)
+__SYSCALL(44, sys_ni_syscall)           /* 44 was sys_prof */
+#define __NR_brk                        45
+__SYSCALL(__NR_brk, sys_brk)
+#define __NR_setgid                     46
+__SYSCALL(__NR_setgid, sys_setgid16)
+#define __NR_getgid                     47
+__SYSCALL(__NR_getgid, sys_getgid16)
+__SYSCALL(48, sys_ni_syscall)           /* 48 was sys_signal */
+#define __NR_geteuid                    49
+__SYSCALL(__NR_geteuid, sys_geteuid16)
+#define __NR_getegid                    50
+__SYSCALL(__NR_getegid, sys_getegid16)
+#define __NR_acct                       51
+__SYSCALL(__NR_acct, sys_acct)
+#define __NR_umount2                    52
+__SYSCALL(__NR_umount2, sys_umount)
+__SYSCALL(53, sys_ni_syscall)           /* 53 was sys_lock */
+#define __NR_ioctl                      54
+__SYSCALL(__NR_ioctl, sys_ioctl)
+#define __NR_fcntl                      55
+__SYSCALL(__NR_fcntl, sys_fcntl)
+__SYSCALL(56, sys_ni_syscall)           /* 56 was sys_mpx */
+#define __NR_setpgid                    57
+__SYSCALL(__NR_setpgid, sys_setpgid)
+__SYSCALL(58, sys_ni_syscall)           /* 58 was sys_ulimit */
+__SYSCALL(59, sys_ni_syscall)           /* 59 was sys_olduname */
+#define __NR_umask                      60
+__SYSCALL(__NR_umask, sys_umask)
+#define __NR_chroot                     61
+__SYSCALL(__NR_chroot, sys_chroot)
+#define __NR_ustat                      62
+__SYSCALL(__NR_ustat, sys_ustat)
+#define __NR_dup2                       63
+__SYSCALL(__NR_dup2, sys_dup2)
+#define __NR_getppid                    64
+__SYSCALL(__NR_getppid, sys_getppid)
+#define __NR_getpgrp                    65
+__SYSCALL(__NR_getpgrp, sys_getpgrp)
+#define __NR_setsid                     66
+__SYSCALL(__NR_setsid, sys_setsid)
+#define __NR_sigaction                  67
+__SYSCALL(__NR_sigaction, sys_sigaction)
+__SYSCALL(68, sys_ni_syscall)           /* 68 was sys_sgetmask */
+__SYSCALL(69, sys_ni_syscall)           /* 69 was sys_ssetmask */
+#define __NR_setreuid                   70
+__SYSCALL(__NR_setreuid, sys_setreuid16)
+#define __NR_setregid                   71
+__SYSCALL(__NR_setregid, sys_setregid16)
+#define __NR_sigsuspend                 72
+__SYSCALL(__NR_sigsuspend, sys_sigsuspend)
+#define __NR_sigpending                 73
+__SYSCALL(__NR_sigpending, sys_sigpending)
+#define __NR_sethostname                74
+__SYSCALL(__NR_sethostname, sys_sethostname)
+#define __NR_setrlimit                  75
+__SYSCALL(__NR_setrlimit, sys_setrlimit)
+__SYSCALL(76, sys_ni_syscall)           /* 76 was sys_getrlimit */
+#define __NR_getrusage                  77
+__SYSCALL(__NR_getrusage, sys_getrusage)
+#define __NR_gettimeofday               78
+__SYSCALL(__NR_gettimeofday, sys_gettimeofday)
+#define __NR_settimeofday               79
+__SYSCALL(__NR_settimeofday, sys_settimeofday)
+#define __NR_getgroups                  80
+__SYSCALL(__NR_getgroups, sys_getgroups16)
+#define __NR_setgroups                  81
+__SYSCALL(__NR_setgroups, sys_setgroups16)
+__SYSCALL(82, sys_ni_syscall)           /* 82 was sys_select */
+#define __NR_symlink                    83
+__SYSCALL(__NR_symlink, sys_symlink)
+__SYSCALL(84, sys_ni_syscall)           /* 84 was sys_lstat */
+#define __NR_readlink                   85
+__SYSCALL(__NR_readlink, sys_readlink)
+#define __NR_uselib                     86
+__SYSCALL(__NR_uselib, sys_uselib)
+#define __NR_swapon                     87
+__SYSCALL(__NR_swapon, sys_swapon)
+#define __NR_reboot                     88
+__SYSCALL(__NR_reboot, sys_reboot)
+__SYSCALL(89, sys_ni_syscall)           /* 89 was sys_readdir */
+__SYSCALL(90, sys_ni_syscall)           /* 90 was sys_mmap */
+#define __NR_munmap                     91
+__SYSCALL(__NR_munmap, sys_munmap)
+#define __NR_truncate                   92
+__SYSCALL(__NR_truncate, sys_truncate)
+#define __NR_ftruncate                  93
+__SYSCALL(__NR_ftruncate, sys_ftruncate)
+#define __NR_fchmod                     94
+__SYSCALL(__NR_fchmod, sys_fchmod)
+#define __NR_fchown                     95
+__SYSCALL(__NR_fchown, sys_fchown16)
+#define __NR_getpriority                96
+__SYSCALL(__NR_getpriority, sys_getpriority)
+#define __NR_setpriority                97
+__SYSCALL(__NR_setpriority, sys_setpriority)
+__SYSCALL(98, sys_ni_syscall)           /* 98 was sys_profil */
+#define __NR_statfs                     99
+__SYSCALL(__NR_statfs, sys_statfs)
+#define __NR_fstatfs                    100
+__SYSCALL(__NR_fstatfs, sys_fstatfs)
+__SYSCALL(101, sys_ni_syscall)          /* 101 was sys_ioperm */
+__SYSCALL(102, sys_ni_syscall)          /* 102 was sys_socketcall */
+#define __NR_syslog                     103
+__SYSCALL(__NR_syslog, sys_syslog)
+#define __NR_setitimer                  104
+__SYSCALL(__NR_setitimer, sys_setitimer)
+#define __NR_getitimer                  105
+__SYSCALL(__NR_getitimer, sys_getitimer)
+#define __NR_stat                       106
+__SYSCALL(__NR_stat, sys_newstat)
+#define __NR_lstat                      107
+__SYSCALL(__NR_lstat, sys_newlstat)
+#define __NR_fstat                      108
+__SYSCALL(__NR_fstat, sys_newfstat)
+__SYSCALL(109, sys_ni_syscall)          /* 109 was sys_uname */
+__SYSCALL(110, sys_ni_syscall)          /* 110 was sys_iopl */
+#define __NR_vhangup                    111
+__SYSCALL(__NR_vhangup, sys_vhangup)
+__SYSCALL(112, sys_ni_syscall)          /* 112 was sys_idle */
+__SYSCALL(113, sys_ni_syscall)          /* 113 was sys_syscall */
+#define __NR_wait4                      114
+__SYSCALL(__NR_wait4, sys_wait4)
+#define __NR_swapoff                    115
+__SYSCALL(__NR_swapoff, sys_swapoff)
+#define __NR_sysinfo                    116
+__SYSCALL(__NR_sysinfo, sys_sysinfo)
+__SYSCALL(117, sys_ni_syscall)          /* 117 was sys_ipc */
+#define __NR_fsync                      118
+__SYSCALL(__NR_fsync, sys_fsync)
+#define __NR_sigreturn                  119
+__SYSCALL(__NR_sigreturn, sys_sigreturn)
+#define __NR_clone                      120
+__SYSCALL(__NR_clone, sys_clone)
+#define __NR_setdomainname              121
+__SYSCALL(__NR_setdomainname, sys_setdomainname)
+#define __NR_uname                      122
+__SYSCALL(__NR_uname, sys_newuname)
+__SYSCALL(123, sys_ni_syscall)          /* 123 was sys_modify_ldt */
+#define __NR_adjtimex                   124
+__SYSCALL(__NR_adjtimex, sys_adjtimex)
+#define __NR_mprotect                   125
+__SYSCALL(__NR_mprotect, sys_mprotect)
+#define __NR_sigprocmask                126
+__SYSCALL(__NR_sigprocmask, sys_sigprocmask)
+__SYSCALL(127, sys_ni_syscall)          /* 127 was sys_create_module */
+#define __NR_init_module                128
+__SYSCALL(__NR_init_module, sys_init_module)
+#define __NR_delete_module              129
+__SYSCALL(__NR_delete_module, sys_delete_module)
+__SYSCALL(130, sys_ni_syscall)          /* 130 was sys_get_kernel_syms */
+#define __NR_quotactl                   131
+__SYSCALL(__NR_quotactl, sys_quotactl)
+#define __NR_getpgid                    132
+__SYSCALL(__NR_getpgid, sys_getpgid)
+#define __NR_fchdir                     133
+__SYSCALL(__NR_fchdir, sys_fchdir)
+#define __NR_bdflush                    134
+__SYSCALL(__NR_bdflush, sys_bdflush)
+#define __NR_sysfs                      135
+__SYSCALL(__NR_sysfs, sys_sysfs)
+#define __NR_personality                136
+__SYSCALL(__NR_personality, sys_personality)
+__SYSCALL(137, sys_ni_syscall)          /* 137 was sys_afs_syscall */
+#define __NR_setfsuid                   138
+__SYSCALL(__NR_setfsuid, sys_setfsuid16)
+#define __NR_setfsgid                   139
+__SYSCALL(__NR_setfsgid, sys_setfsgid16)
+#define __NR__llseek                    140
+__SYSCALL(__NR__llseek, sys_llseek)
+#define __NR_getdents                   141
+__SYSCALL(__NR_getdents, sys_getdents)
+#define __NR__newselect                 142
+__SYSCALL(__NR__newselect, sys_select)
+#define __NR_flock                      143
+__SYSCALL(__NR_flock, sys_flock)
+#define __NR_msync                      144
+__SYSCALL(__NR_msync, sys_msync)
+#define __NR_readv                      145
+__SYSCALL(__NR_readv, sys_readv)
+#define __NR_writev                     146
+__SYSCALL(__NR_writev, sys_writev)
+#define __NR_getsid                     147
+__SYSCALL(__NR_getsid, sys_getsid)
+#define __NR_fdatasync                  148
+__SYSCALL(__NR_fdatasync, sys_fdatasync)
+#define __NR__sysctl                    149
+__SYSCALL(__NR__sysctl, sys_sysctl)
+#define __NR_mlock                      150
+__SYSCALL(__NR_mlock, sys_mlock)
+#define __NR_munlock                    151
+__SYSCALL(__NR_munlock, sys_munlock)
+#define __NR_mlockall                   152
+__SYSCALL(__NR_mlockall, sys_mlockall)
+#define __NR_munlockall                 153
+__SYSCALL(__NR_munlockall, sys_munlockall)
+#define __NR_sched_setparam             154
+__SYSCALL(__NR_sched_setparam, sys_sched_setparam)
+#define __NR_sched_getparam             155
+__SYSCALL(__NR_sched_getparam, sys_sched_getparam)
+#define __NR_sched_setscheduler         156
+__SYSCALL(__NR_sched_setscheduler, sys_sched_setscheduler)
+#define __NR_sched_getscheduler         157
+__SYSCALL(__NR_sched_getscheduler, sys_sched_getscheduler)
+#define __NR_sched_yield                158
+__SYSCALL(__NR_sched_yield, sys_sched_yield)
+#define __NR_sched_get_priority_max     159
+__SYSCALL(__NR_sched_get_priority_max, sys_sched_get_priority_max)
+#define __NR_sched_get_priority_min     160
+__SYSCALL(__NR_sched_get_priority_min, sys_sched_get_priority_min)
+#define __NR_sched_rr_get_interval      161
+__SYSCALL(__NR_sched_rr_get_interval, sys_sched_rr_get_interval)
+#define __NR_nanosleep                  162
+__SYSCALL(__NR_nanosleep, sys_nanosleep)
+#define __NR_mremap                     163
+__SYSCALL(__NR_mremap, sys_mremap)
+#define __NR_setresuid                  164
+__SYSCALL(__NR_setresuid, sys_setresuid16)
+#define __NR_getresuid                  165
+__SYSCALL(__NR_getresuid, sys_getresuid16)
+__SYSCALL(166, sys_ni_syscall)          /* 166 was sys_vm86 */
+__SYSCALL(167, sys_ni_syscall)          /* 167 was sys_query_module */
+#define __NR_poll                       168
+__SYSCALL(__NR_poll, sys_poll)
+#define __NR_nfsservctl                 169
+__SYSCALL(__NR_nfsservctl, sys_ni_syscall)
+#define __NR_setresgid                  170
+__SYSCALL(__NR_setresgid, sys_setresgid16)
+#define __NR_getresgid                  171
+__SYSCALL(__NR_getresgid, sys_getresgid16)
+#define __NR_prctl                      172
+__SYSCALL(__NR_prctl, sys_prctl)
+#define __NR_rt_sigreturn               173
+__SYSCALL(__NR_rt_sigreturn, sys_rt_sigreturn)
+#define __NR_rt_sigaction               174
+__SYSCALL(__NR_rt_sigaction, sys_rt_sigaction)
+#define __NR_rt_sigprocmask             175
+__SYSCALL(__NR_rt_sigprocmask, sys_rt_sigprocmask)
+#define __NR_rt_sigpending              176
+__SYSCALL(__NR_rt_sigpending, sys_rt_sigpending)
+#define __NR_rt_sigtimedwait            177
+__SYSCALL(__NR_rt_sigtimedwait, sys_rt_sigtimedwait)
+#define __NR_rt_sigqueueinfo            178
+__SYSCALL(__NR_rt_sigqueueinfo, sys_rt_sigqueueinfo)
+#define __NR_rt_sigsuspend              179
+__SYSCALL(__NR_rt_sigsuspend, sys_rt_sigsuspend)
+#define __NR_pread64                    180
+__SYSCALL(__NR_pread64, sys_pread64)
+#define __NR_pwrite64                   181
+__SYSCALL(__NR_pwrite64, sys_pwrite64)
+#define __NR_chown                      182
+__SYSCALL(__NR_chown, sys_chown16)
+#define __NR_getcwd                     183
+__SYSCALL(__NR_getcwd, sys_getcwd)
+#define __NR_capget                     184
+__SYSCALL(__NR_capget, sys_capget)
+#define __NR_capset                     185
+__SYSCALL(__NR_capset, sys_capset)
+#define __NR_sigaltstack                186
+__SYSCALL(__NR_sigaltstack, sys_sigaltstack)
+#define __NR_sendfile                   187
+__SYSCALL(__NR_sendfile, sys_sendfile)
+__SYSCALL(188, sys_ni_syscall)          /* 188 reserved */
+__SYSCALL(189, sys_ni_syscall)          /* 189 reserved */
+#define __NR_vfork                      190
+__SYSCALL(__NR_vfork, sys_vfork)
+#define __NR_ugetrlimit                 191     /* SuS compliant getrlimit */
+__SYSCALL(__NR_ugetrlimit, sys_getrlimit)
+#define __NR_mmap2                      192
+__SYSCALL(__NR_mmap2, sys_mmap2)
+#define __NR_truncate64                 193
+__SYSCALL(__NR_truncate64, sys_truncate64)
+#define __NR_ftruncate64                194
+__SYSCALL(__NR_ftruncate64, sys_ftruncate64)
+#define __NR_stat64                     195
+__SYSCALL(__NR_stat64, sys_stat64)
+#define __NR_lstat64                    196
+__SYSCALL(__NR_lstat64, sys_lstat64)
+#define __NR_fstat64                    197
+__SYSCALL(__NR_fstat64, sys_fstat64)
+#define __NR_lchown32                   198
+__SYSCALL(__NR_lchown32, sys_lchown)
+#define __NR_getuid32                   199
+__SYSCALL(__NR_getuid32, sys_getuid)
+#define __NR_getgid32                   200
+__SYSCALL(__NR_getgid32, sys_getgid)
+#define __NR_geteuid32                  201
+__SYSCALL(__NR_geteuid32, sys_geteuid)
+#define __NR_getegid32                  202
+__SYSCALL(__NR_getegid32, sys_getegid)
+#define __NR_setreuid32                 203
+__SYSCALL(__NR_setreuid32, sys_setreuid)
+#define __NR_setregid32                 204
+__SYSCALL(__NR_setregid32, sys_setregid)
+#define __NR_getgroups32                205
+__SYSCALL(__NR_getgroups32, sys_getgroups)
+#define __NR_setgroups32                206
+__SYSCALL(__NR_setgroups32, sys_setgroups)
+#define __NR_fchown32                   207
+__SYSCALL(__NR_fchown32, sys_fchown)
+#define __NR_setresuid32                208
+__SYSCALL(__NR_setresuid32, sys_setresuid)
+#define __NR_getresuid32                209
+__SYSCALL(__NR_getresuid32, sys_getresuid)
+#define __NR_setresgid32                210
+__SYSCALL(__NR_setresgid32, sys_setresgid)
+#define __NR_getresgid32                211
+__SYSCALL(__NR_getresgid32, sys_getresgid)
+#define __NR_chown32                    212
+__SYSCALL(__NR_chown32, sys_chown)
+#define __NR_setuid32                   213
+__SYSCALL(__NR_setuid32, sys_setuid)
+#define __NR_setgid32                   214
+__SYSCALL(__NR_setgid32, sys_setgid)
+#define __NR_setfsuid32                 215
+__SYSCALL(__NR_setfsuid32, sys_setfsuid)
+#define __NR_setfsgid32                 216
+__SYSCALL(__NR_setfsgid32, sys_setfsgid)
+#define __NR_getdents64                 217
+__SYSCALL(__NR_getdents64, sys_getdents64)
+#define __NR_pivot_root                 218
+__SYSCALL(__NR_pivot_root, sys_pivot_root)
+#define __NR_mincore                    219
+__SYSCALL(__NR_mincore, sys_mincore)
+#define __NR_madvise                    220
+__SYSCALL(__NR_madvise, sys_madvise)
+#define __NR_fcntl64                    221
+__SYSCALL(__NR_fcntl64, sys_fcntl64)
+__SYSCALL(222, sys_ni_syscall)          /* 222 for tux */
+__SYSCALL(223, sys_ni_syscall)          /* 223 is unused */
+#define __NR_gettid                     224
+__SYSCALL(__NR_gettid, sys_gettid)
+#define __NR_readahead                  225
+__SYSCALL(__NR_readahead, sys_readahead)
+#define __NR_setxattr                   226
+__SYSCALL(__NR_setxattr, sys_setxattr)
+#define __NR_lsetxattr                  227
+__SYSCALL(__NR_lsetxattr, sys_lsetxattr)
+#define __NR_fsetxattr                  228
+__SYSCALL(__NR_fsetxattr, sys_fsetxattr)
+#define __NR_getxattr                   229
+__SYSCALL(__NR_getxattr, sys_getxattr)
+#define __NR_lgetxattr                  230
+__SYSCALL(__NR_lgetxattr, sys_lgetxattr)
+#define __NR_fgetxattr                  231
+__SYSCALL(__NR_fgetxattr, sys_fgetxattr)
+#define __NR_listxattr                  232
+__SYSCALL(__NR_listxattr, sys_listxattr)
+#define __NR_llistxattr                 233
+__SYSCALL(__NR_llistxattr, sys_llistxattr)
+#define __NR_flistxattr                 234
+__SYSCALL(__NR_flistxattr, sys_flistxattr)
+#define __NR_removexattr                235
+__SYSCALL(__NR_removexattr, sys_removexattr)
+#define __NR_lremovexattr               236
+__SYSCALL(__NR_lremovexattr, sys_lremovexattr)
+#define __NR_fremovexattr               237
+__SYSCALL(__NR_fremovexattr, sys_fremovexattr)
+#define __NR_tkill                      238
+__SYSCALL(__NR_tkill, sys_tkill)
+#define __NR_sendfile64                 239
+__SYSCALL(__NR_sendfile64, sys_sendfile64)
+#define __NR_futex                      240
+__SYSCALL(__NR_futex, sys_futex)
+#define __NR_sched_setaffinity          241
+__SYSCALL(__NR_sched_setaffinity, sys_sched_setaffinity)
+#define __NR_sched_getaffinity          242
+__SYSCALL(__NR_sched_getaffinity, sys_sched_getaffinity)
+#define __NR_io_setup                   243
+__SYSCALL(__NR_io_setup, sys_io_setup)
+#define __NR_io_destroy                 244
+__SYSCALL(__NR_io_destroy, sys_io_destroy)
+#define __NR_io_getevents               245
+__SYSCALL(__NR_io_getevents, sys_io_getevents)
+#define __NR_io_submit                  246
+__SYSCALL(__NR_io_submit, sys_io_submit)
+#define __NR_io_cancel                  247
+__SYSCALL(__NR_io_cancel, sys_io_cancel)
+#define __NR_exit_group                 248
+__SYSCALL(__NR_exit_group, sys_exit_group)
+#define __NR_lookup_dcookie             249
+__SYSCALL(__NR_lookup_dcookie, sys_lookup_dcookie)
+#define __NR_epoll_create               250
+__SYSCALL(__NR_epoll_create, sys_epoll_create)
+#define __NR_epoll_ctl                  251
+__SYSCALL(__NR_epoll_ctl, sys_epoll_ctl)
+#define __NR_epoll_wait                 252
+__SYSCALL(__NR_epoll_wait, sys_epoll_wait)
+#define __NR_remap_file_pages           253
+__SYSCALL(__NR_remap_file_pages, sys_remap_file_pages)
+__SYSCALL(254, sys_ni_syscall)          /* 254 for set_thread_area */
+__SYSCALL(255, sys_ni_syscall)          /* 255 for get_thread_area */
+#define __NR_set_tid_address            256
+__SYSCALL(__NR_set_tid_address, sys_set_tid_address)
+#define __NR_timer_create               257
+__SYSCALL(__NR_timer_create, sys_timer_create)
+#define __NR_timer_settime              258
+__SYSCALL(__NR_timer_settime, sys_timer_settime)
+#define __NR_timer_gettime              259
+__SYSCALL(__NR_timer_gettime, sys_timer_gettime)
+#define __NR_timer_getoverrun           260
+__SYSCALL(__NR_timer_getoverrun, sys_timer_getoverrun)
+#define __NR_timer_delete               261
+__SYSCALL(__NR_timer_delete, sys_timer_delete)
+#define __NR_clock_settime              262
+__SYSCALL(__NR_clock_settime, sys_clock_settime)
+#define __NR_clock_gettime              263
+__SYSCALL(__NR_clock_gettime, sys_clock_gettime)
+#define __NR_clock_getres               264
+__SYSCALL(__NR_clock_getres, sys_clock_getres)
+#define __NR_clock_nanosleep            265
+__SYSCALL(__NR_clock_nanosleep, sys_clock_nanosleep)
+#define __NR_statfs64                   266
+__SYSCALL(__NR_statfs64, sys_statfs64)
+#define __NR_fstatfs64                  267
+__SYSCALL(__NR_fstatfs64, sys_fstatfs64)
+#define __NR_tgkill                     268
+__SYSCALL(__NR_tgkill, sys_tgkill)
+#define __NR_utimes                     269
+__SYSCALL(__NR_utimes, sys_utimes)
+#define __NR_fadvise64                  270
+__SYSCALL(__NR_fadvise64, sys_fadvise64_64)
+#define __NR_pciconfig_iobase           271
+__SYSCALL(__NR_pciconfig_iobase, sys_pciconfig_iobase)
+#define __NR_pciconfig_read             272
+__SYSCALL(__NR_pciconfig_read, sys_pciconfig_read)
+#define __NR_pciconfig_write            273
+__SYSCALL(__NR_pciconfig_write, sys_pciconfig_write)
+#define __NR_mq_open                    274
+__SYSCALL(__NR_mq_open, sys_mq_open)
+#define __NR_mq_unlink                  275
+__SYSCALL(__NR_mq_unlink, sys_mq_unlink)
+#define __NR_mq_timedsend               276
+__SYSCALL(__NR_mq_timedsend, sys_mq_timedsend)
+#define __NR_mq_timedreceive            277
+__SYSCALL(__NR_mq_timedreceive, sys_mq_timedreceive)
+#define __NR_mq_notify                  278
+__SYSCALL(__NR_mq_notify, sys_mq_notify)
+#define __NR_mq_getsetattr              279
+__SYSCALL(__NR_mq_getsetattr, sys_mq_getsetattr)
+#define __NR_waitid                     280
+__SYSCALL(__NR_waitid, sys_waitid)
+#define __NR_socket                     281
+__SYSCALL(__NR_socket, sys_socket)
+#define __NR_bind                       282
+__SYSCALL(__NR_bind, sys_bind)
+#define __NR_connect                    283
+__SYSCALL(__NR_connect, sys_connect)
+#define __NR_listen                     284
+__SYSCALL(__NR_listen, sys_listen)
+#define __NR_accept                     285
+__SYSCALL(__NR_accept, sys_accept)
+#define __NR_getsockname                286
+__SYSCALL(__NR_getsockname, sys_getsockname)
+#define __NR_getpeername                287
+__SYSCALL(__NR_getpeername, sys_getpeername)
+#define __NR_socketpair                 288
+__SYSCALL(__NR_socketpair, sys_socketpair)
+#define __NR_send                       289
+__SYSCALL(__NR_send, sys_send)
+#define __NR_sendto                     290
+__SYSCALL(__NR_sendto, sys_sendto)
+#define __NR_recv                       291
+__SYSCALL(__NR_recv, sys_recv)
+#define __NR_recvfrom                   292
+__SYSCALL(__NR_recvfrom, sys_recvfrom)
+#define __NR_shutdown                   293
+__SYSCALL(__NR_shutdown, sys_shutdown)
+#define __NR_setsockopt                 294
+__SYSCALL(__NR_setsockopt, sys_setsockopt)
+#define __NR_getsockopt                 295
+__SYSCALL(__NR_getsockopt, sys_getsockopt)
+#define __NR_sendmsg                    296
+__SYSCALL(__NR_sendmsg, sys_sendmsg)
+#define __NR_recvmsg                    297
+__SYSCALL(__NR_recvmsg, sys_recvmsg)
+#define __NR_semop                      298
+__SYSCALL(__NR_semop, sys_semop)
+#define __NR_semget                     299
+__SYSCALL(__NR_semget, sys_semget)
+#define __NR_semctl                     300
+__SYSCALL(__NR_semctl, sys_semctl)
+#define __NR_msgsnd                     301
+__SYSCALL(__NR_msgsnd, sys_msgsnd)
+#define __NR_msgrcv                     302
+__SYSCALL(__NR_msgrcv, sys_msgrcv)
+#define __NR_msgget                     303
+__SYSCALL(__NR_msgget, sys_msgget)
+#define __NR_msgctl                     304
+__SYSCALL(__NR_msgctl, sys_msgctl)
+#define __NR_shmat                      305
+__SYSCALL(__NR_shmat, sys_shmat)
+#define __NR_shmdt                      306
+__SYSCALL(__NR_shmdt, sys_shmdt)
+#define __NR_shmget                     307
+__SYSCALL(__NR_shmget, sys_shmget)
+#define __NR_shmctl                     308
+__SYSCALL(__NR_shmctl, sys_shmctl)
+#define __NR_add_key                    309
+__SYSCALL(__NR_add_key, sys_add_key)
+#define __NR_request_key                310
+__SYSCALL(__NR_request_key, sys_request_key)
+#define __NR_keyctl                     311
+__SYSCALL(__NR_keyctl, sys_keyctl)
+#define __NR_semtimedop                 312
+__SYSCALL(__NR_semtimedop, sys_semtimedop)
+#define __NR_vserver                    313
+__SYSCALL(__NR_vserver, sys_ni_syscall)
+#define __NR_ioprio_set                 314
+__SYSCALL(__NR_ioprio_set, sys_ioprio_set)
+#define __NR_ioprio_get                 315
+__SYSCALL(__NR_ioprio_get, sys_ioprio_get)
+#define __NR_inotify_init               316
+__SYSCALL(__NR_inotify_init, sys_inotify_init)
+#define __NR_inotify_add_watch          317
+__SYSCALL(__NR_inotify_add_watch, sys_inotify_add_watch)
+#define __NR_inotify_rm_watch           318
+__SYSCALL(__NR_inotify_rm_watch, sys_inotify_rm_watch)
+#define __NR_mbind                      319
+__SYSCALL(__NR_mbind, sys_mbind)
+#define __NR_get_mempolicy              320
+__SYSCALL(__NR_get_mempolicy, sys_get_mempolicy)
+#define __NR_set_mempolicy              321
+__SYSCALL(__NR_set_mempolicy, sys_set_mempolicy)
+#define __NR_openat                     322
+__SYSCALL(__NR_openat, sys_openat)
+#define __NR_mkdirat                    323
+__SYSCALL(__NR_mkdirat, sys_mkdirat)
+#define __NR_mknodat                    324
+__SYSCALL(__NR_mknodat, sys_mknodat)
+#define __NR_fchownat                   325
+__SYSCALL(__NR_fchownat, sys_fchownat)
+#define __NR_futimesat                  326
+__SYSCALL(__NR_futimesat, sys_futimesat)
+#define __NR_fstatat64                  327
+__SYSCALL(__NR_fstatat64, sys_fstatat64)
+#define __NR_unlinkat                   328
+__SYSCALL(__NR_unlinkat, sys_unlinkat)
+#define __NR_renameat                   329
+__SYSCALL(__NR_renameat, sys_renameat)
+#define __NR_linkat                     330
+__SYSCALL(__NR_linkat, sys_linkat)
+#define __NR_symlinkat                  331
+__SYSCALL(__NR_symlinkat, sys_symlinkat)
+#define __NR_readlinkat                 332
+__SYSCALL(__NR_readlinkat, sys_readlinkat)
+#define __NR_fchmodat                   333
+__SYSCALL(__NR_fchmodat, sys_fchmodat)
+#define __NR_faccessat                  334
+__SYSCALL(__NR_faccessat, sys_faccessat)
+#define __NR_pselect6                   335
+__SYSCALL(__NR_pselect6, sys_pselect6)
+#define __NR_ppoll                      336
+__SYSCALL(__NR_ppoll, sys_ppoll)
+#define __NR_unshare                    337
+__SYSCALL(__NR_unshare, sys_unshare)
+#define __NR_set_robust_list            338
+__SYSCALL(__NR_set_robust_list, sys_set_robust_list)
+#define __NR_get_robust_list            339
+__SYSCALL(__NR_get_robust_list, sys_get_robust_list)
+#define __NR_splice                     340
+__SYSCALL(__NR_splice, sys_splice)
+#define __NR_sync_file_range2           341
+__SYSCALL(__NR_sync_file_range2, sys_sync_file_range2)
+#define __NR_tee                        342
+__SYSCALL(__NR_tee, sys_tee)
+#define __NR_vmsplice                   343
+__SYSCALL(__NR_vmsplice, sys_vmsplice)
+#define __NR_move_pages                 344
+__SYSCALL(__NR_move_pages, sys_move_pages)
+#define __NR_getcpu                     345
+__SYSCALL(__NR_getcpu, sys_getcpu)
+#define __NR_epoll_pwait                346
+__SYSCALL(__NR_epoll_pwait, sys_epoll_pwait)
+#define __NR_kexec_load                 347
+__SYSCALL(__NR_kexec_load, sys_kexec_load)
+#define __NR_utimensat                  348
+__SYSCALL(__NR_utimensat, sys_utimensat)
+#define __NR_signalfd                   349
+__SYSCALL(__NR_signalfd, sys_signalfd)
+#define __NR_timerfd_create             350
+__SYSCALL(__NR_timerfd_create, sys_timerfd_create)
+#define __NR_eventfd                    351
+__SYSCALL(__NR_eventfd, sys_eventfd)
+#define __NR_fallocate                  352
+__SYSCALL(__NR_fallocate, sys_fallocate)
+#define __NR_timerfd_settime            353
+__SYSCALL(__NR_timerfd_settime, sys_timerfd_settime)
+#define __NR_timerfd_gettime            354
+__SYSCALL(__NR_timerfd_gettime, sys_timerfd_gettime)
+#define __NR_signalfd4                  355
+__SYSCALL(__NR_signalfd4, sys_signalfd4)
+#define __NR_eventfd2                   356
+__SYSCALL(__NR_eventfd2, sys_eventfd2)
+#define __NR_epoll_create1              357
+__SYSCALL(__NR_epoll_create1, sys_epoll_create1)
+#define __NR_dup3                       358
+__SYSCALL(__NR_dup3, sys_dup3)
+#define __NR_pipe2                      359
+__SYSCALL(__NR_pipe2, sys_pipe2)
+#define __NR_inotify_init1              360
+__SYSCALL(__NR_inotify_init1, sys_inotify_init1)
+#define __NR_preadv                     361
+__SYSCALL(__NR_preadv, sys_preadv)
+#define __NR_pwritev                    362
+__SYSCALL(__NR_pwritev, sys_pwritev)
+#define __NR_rt_tgsigqueueinfo          363
+__SYSCALL(__NR_rt_tgsigqueueinfo, sys_rt_tgsigqueueinfo)
+#define __NR_perf_event_open            364
+__SYSCALL(__NR_perf_event_open, sys_perf_event_open)
+#define __NR_recvmmsg                   365
+__SYSCALL(__NR_recvmmsg, sys_recvmmsg)
+#define __NR_accept4                    366
+__SYSCALL(__NR_accept4, sys_accept4)
+#define __NR_fanotify_init              367
+__SYSCALL(__NR_fanotify_init, sys_fanotify_init)
+#define __NR_fanotify_mark              368
+__SYSCALL(__NR_fanotify_mark, sys_fanotify_mark)
+#define __NR_prlimit64                  369
+__SYSCALL(__NR_prlimit64, sys_prlimit64)
+#define __NR_name_to_handle_at          370
+__SYSCALL(__NR_name_to_handle_at, sys_name_to_handle_at)
+#define __NR_open_by_handle_at          371
+__SYSCALL(__NR_open_by_handle_at, sys_open_by_handle_at)
+#define __NR_clock_adjtime              372
+__SYSCALL(__NR_clock_adjtime, sys_clock_adjtime)
+#define __NR_syncfs                     373
+__SYSCALL(__NR_syncfs, sys_syncfs)
+
+/*
+ * The following SVCs are ARM private.
+ */
+#define __ARM_NR_COMPAT_BASE            0x0f0000
+#define __ARM_NR_compat_cacheflush      (__ARM_NR_COMPAT_BASE+2)
+#define __ARM_NR_compat_set_tls         (__ARM_NR_COMPAT_BASE+5)
+
+#endif  /* __SYSCALL_COMPAT */
+
+#define __NR_compat_syscalls            374
+
+#define __ARCH_WANT_COMPAT_IPC_PARSE_VERSION
+#define __ARCH_WANT_COMPAT_STAT64
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
+
+#endif /* __ASM_UNISTD32_H */
diff --git a/arch/arm64/include/asm/vdso.h b/arch/arm64/include/asm/vdso.h
new file mode 100644
index 00000000000..839ce0031bd
--- /dev/null
+++ b/arch/arm64/include/asm/vdso.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2012 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_VDSO_H
+#define __ASM_VDSO_H
+
+#ifdef __KERNEL__
+
+/*
+ * Default link address for the vDSO.
+ * Since we randomise the VDSO mapping, there's little point in trying
+ * to prelink this.
+ */
+#define VDSO_LBASE      0x0
+
+#ifndef __ASSEMBLY__
+
+#include <generated/vdso-offsets.h>
+
+#define VDSO_SYMBOL(base, name)                                            \
+({                                                                         \
+        (void *)(vdso_offset_##name - VDSO_LBASE + (unsigned long)(base)); \
+})
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __KERNEL__ */
+
+#endif /* __ASM_VDSO_H */
diff --git a/arch/arm64/include/asm/vdso_datapage.h b/arch/arm64/include/asm/vdso_datapage.h
new file mode 100644
index 00000000000..de66199673d
--- /dev/null
+++ b/arch/arm64/include/asm/vdso_datapage.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2012 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_VDSO_DATAPAGE_H
+#define __ASM_VDSO_DATAPAGE_H
+
+#ifdef __KERNEL__
+
+#ifndef __ASSEMBLY__
+
+struct vdso_data {
+        __u64 cs_cycle_last;    /* Timebase at clocksource init */
+        __u64 xtime_clock_sec;  /* Kernel time */
+        __u64 xtime_clock_nsec;
+        __u64 xtime_coarse_sec; /* Coarse time */
+        __u64 xtime_coarse_nsec;
+        __u64 wtm_clock_sec;    /* Wall to monotonic time */
+        __u64 wtm_clock_nsec;
+        __u32 tb_seq_count;     /* Timebase sequence counter */
+        __u32 cs_mult;          /* Clocksource multiplier */
+        __u32 cs_shift;         /* Clocksource shift */
+        __u32 tz_minuteswest;   /* Whacky timezone stuff */
+        __u32 tz_dsttime;
+        __u32 use_syscall;
+};
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __KERNEL__ */
+
+#endif /* __ASM_VDSO_DATAPAGE_H */
diff --git a/arch/arm64/kernel/.gitignore b/arch/arm64/kernel/.gitignore
new file mode 100644
index 00000000000..c5f676c3c22
--- /dev/null
+++ b/arch/arm64/kernel/.gitignore
@@ -0,0 +1 @@
+vmlinux.lds
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
new file mode 100644
index 00000000000..e2caff1b812
--- /dev/null
+++ b/arch/arm64/kernel/Makefile
@@ -0,0 +1,27 @@
+#
+# Makefile for the linux kernel.
+#
+
+CPPFLAGS_vmlinux.lds    := -DTEXT_OFFSET=$(TEXT_OFFSET)
+AFLAGS_head.o           := -DTEXT_OFFSET=$(TEXT_OFFSET)
+
+# Object file lists.
+arm64-obj-y             := cputable.o debug-monitors.o entry.o irq.o fpsimd.o   \
+                           entry-fpsimd.o process.o ptrace.o setup.o signal.o   \
+                           sys.o stacktrace.o time.o traps.o io.o vdso.o
+
+arm64-obj-$(CONFIG_COMPAT)              += sys32.o kuser32.o signal32.o         \
+                                           sys_compat.o
+arm64-obj-$(CONFIG_MODULES)             += arm64ksyms.o module.o
+arm64-obj-$(CONFIG_SMP)                 += smp.o
+arm64-obj-$(CONFIG_HW_PERF_EVENTS)      += perf_event.o
+arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT)+= hw_breakpoint.o
+
+obj-y                                   += $(arm64-obj-y) vdso/
+obj-m                                   += $(arm64-obj-m)
+head-y                                  := head.o
+extra-y                                 := $(head-y) vmlinux.lds
+
+# vDSO - this must be built first to generate the symbol offsets
+$(call objectify,$(arm64-obj-y)): $(obj)/vdso/vdso-offsets.h
+$(obj)/vdso/vdso-offsets.h: $(obj)/vdso
diff --git a/arch/arm64/kernel/arm64ksyms.c b/arch/arm64/kernel/arm64ksyms.c
new file mode 100644
index 00000000000..cef3925eaf6
--- /dev/null
+++ b/arch/arm64/kernel/arm64ksyms.c
@@ -0,0 +1,46 @@
+/*
+ * Based on arch/arm/kernel/armksyms.c
+ *
+ * Copyright (C) 2000 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/cryptohash.h>
+#include <linux/delay.h>
+#include <linux/in6.h>
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+
+#include <asm/checksum.h>
+
+        /* user mem (segment) */
+EXPORT_SYMBOL(__strnlen_user);
+EXPORT_SYMBOL(__strncpy_from_user);
+
+EXPORT_SYMBOL(copy_page);
+
+EXPORT_SYMBOL(__copy_from_user);
+EXPORT_SYMBOL(__copy_to_user);
+EXPORT_SYMBOL(__clear_user);
+
+        /* bitops */
+EXPORT_SYMBOL(__atomic_hash);
+
+        /* physical memory */
+EXPORT_SYMBOL(memstart_addr);
diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
new file mode 100644
index 00000000000..a2a4d810bea
--- /dev/null
+++ b/arch/arm64/kernel/asm-offsets.c
@@ -0,0 +1,108 @@
+/*
+ * Based on arch/arm/kernel/asm-offsets.c
+ *
+ * Copyright (C) 1995-2003 Russell King
+ *               2001-2002 Keith Owens
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <asm/thread_info.h>
+#include <asm/memory.h>
+#include <asm/cputable.h>
+#include <asm/vdso_datapage.h>
+#include <linux/kbuild.h>
+
+int main(void)
+{
+  DEFINE(TSK_ACTIVE_MM,         offsetof(struct task_struct, active_mm));
+  BLANK();
+  DEFINE(TI_FLAGS,              offsetof(struct thread_info, flags));
+  DEFINE(TI_PREEMPT,            offsetof(struct thread_info, preempt_count));
+  DEFINE(TI_ADDR_LIMIT,         offsetof(struct thread_info, addr_limit));
+  DEFINE(TI_TASK,               offsetof(struct thread_info, task));
+  DEFINE(TI_EXEC_DOMAIN,        offsetof(struct thread_info, exec_domain));
+  DEFINE(TI_CPU,                offsetof(struct thread_info, cpu));
+  BLANK();
+  DEFINE(THREAD_CPU_CONTEXT,    offsetof(struct task_struct, thread.cpu_context));
+  BLANK();
+  DEFINE(S_X0,                  offsetof(struct pt_regs, regs[0]));
+  DEFINE(S_X1,                  offsetof(struct pt_regs, regs[1]));
+  DEFINE(S_X2,                  offsetof(struct pt_regs, regs[2]));
+  DEFINE(S_X3,                  offsetof(struct pt_regs, regs[3]));
+  DEFINE(S_X4,                  offsetof(struct pt_regs, regs[4]));
+  DEFINE(S_X5,                  offsetof(struct pt_regs, regs[5]));
+  DEFINE(S_X6,                  offsetof(struct pt_regs, regs[6]));
+  DEFINE(S_X7,                  offsetof(struct pt_regs, regs[7]));
+  DEFINE(S_LR,                  offsetof(struct pt_regs, regs[30]));
+  DEFINE(S_SP,                  offsetof(struct pt_regs, sp));
+#ifdef CONFIG_COMPAT
+  DEFINE(S_COMPAT_SP,           offsetof(struct pt_regs, compat_sp));
+#endif
+  DEFINE(S_PSTATE,              offsetof(struct pt_regs, pstate));
+  DEFINE(S_PC,                  offsetof(struct pt_regs, pc));
+  DEFINE(S_ORIG_X0,             offsetof(struct pt_regs, orig_x0));
+  DEFINE(S_SYSCALLNO,           offsetof(struct pt_regs, syscallno));
+  DEFINE(S_FRAME_SIZE,          sizeof(struct pt_regs));
+  BLANK();
+  DEFINE(MM_CONTEXT_ID,         offsetof(struct mm_struct, context.id));
+  BLANK();
+  DEFINE(VMA_VM_MM,             offsetof(struct vm_area_struct, vm_mm));
+  DEFINE(VMA_VM_FLAGS,          offsetof(struct vm_area_struct, vm_flags));
+  BLANK();
+  DEFINE(VM_EXEC,               VM_EXEC);
+  BLANK();
+  DEFINE(PAGE_SZ,               PAGE_SIZE);
+  BLANK();
+  DEFINE(CPU_INFO_SZ,           sizeof(struct cpu_info));
+  DEFINE(CPU_INFO_SETUP,        offsetof(struct cpu_info, cpu_setup));
+  BLANK();
+  DEFINE(DMA_BIDIRECTIONAL,     DMA_BIDIRECTIONAL);
+  DEFINE(DMA_TO_DEVICE,         DMA_TO_DEVICE);
+  DEFINE(DMA_FROM_DEVICE,       DMA_FROM_DEVICE);
+  BLANK();
+  DEFINE(CLOCK_REALTIME,        CLOCK_REALTIME);
+  DEFINE(CLOCK_MONOTONIC,       CLOCK_MONOTONIC);
+  DEFINE(CLOCK_REALTIME_RES,    MONOTONIC_RES_NSEC);
+  DEFINE(CLOCK_REALTIME_COARSE, CLOCK_REALTIME_COARSE);
+  DEFINE(CLOCK_MONOTONIC_COARSE,CLOCK_MONOTONIC_COARSE);
+  DEFINE(CLOCK_COARSE_RES,      LOW_RES_NSEC);
+  DEFINE(NSEC_PER_SEC,          NSEC_PER_SEC);
+  BLANK();
+  DEFINE(VDSO_CS_CYCLE_LAST,    offsetof(struct vdso_data, cs_cycle_last));
+  DEFINE(VDSO_XTIME_CLK_SEC,    offsetof(struct vdso_data, xtime_clock_sec));
+  DEFINE(VDSO_XTIME_CLK_NSEC,   offsetof(struct vdso_data, xtime_clock_nsec));
+  DEFINE(VDSO_XTIME_CRS_SEC,    offsetof(struct vdso_data, xtime_coarse_sec));
+  DEFINE(VDSO_XTIME_CRS_NSEC,   offsetof(struct vdso_data, xtime_coarse_nsec));
+  DEFINE(VDSO_WTM_CLK_SEC,      offsetof(struct vdso_data, wtm_clock_sec));
+  DEFINE(VDSO_WTM_CLK_NSEC,     offsetof(struct vdso_data, wtm_clock_nsec));
+  DEFINE(VDSO_TB_SEQ_COUNT,     offsetof(struct vdso_data, tb_seq_count));
+  DEFINE(VDSO_CS_MULT,          offsetof(struct vdso_data, cs_mult));
+  DEFINE(VDSO_CS_SHIFT,         offsetof(struct vdso_data, cs_shift));
+  DEFINE(VDSO_TZ_MINWEST,       offsetof(struct vdso_data, tz_minuteswest));
+  DEFINE(VDSO_TZ_DSTTIME,       offsetof(struct vdso_data, tz_dsttime));
+  DEFINE(VDSO_USE_SYSCALL,      offsetof(struct vdso_data, use_syscall));
+  BLANK();
+  DEFINE(TVAL_TV_SEC,           offsetof(struct timeval, tv_sec));
+  DEFINE(TVAL_TV_USEC,          offsetof(struct timeval, tv_usec));
+  DEFINE(TSPEC_TV_SEC,          offsetof(struct timespec, tv_sec));
+  DEFINE(TSPEC_TV_NSEC,         offsetof(struct timespec, tv_nsec));
+  BLANK();
+  DEFINE(TZ_MINWEST,            offsetof(struct timezone, tz_minuteswest));
+  DEFINE(TZ_DSTTIME,            offsetof(struct timezone, tz_dsttime));
+  return 0;
+}
diff --git a/arch/arm64/kernel/cputable.c b/arch/arm64/kernel/cputable.c
new file mode 100644
index 00000000000..63cfc4a43f4
--- /dev/null
+++ b/arch/arm64/kernel/cputable.c
@@ -0,0 +1,33 @@
+/*
+ * arch/arm64/kernel/cputable.c
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/init.h>
+
+#include <asm/cputable.h>
+
+extern unsigned long __cpu_setup(void);
+
+struct cpu_info __initdata cpu_table[] = {
+        {
+                .cpu_id_val     = 0x000f0000,
+                .cpu_id_mask    = 0x000f0000,
+                .cpu_name       = "AArch64 Processor",
+                .cpu_setup      = __cpu_setup,
+        },
+        { /* Empty */ },
+};
diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c
new file mode 100644
index 00000000000..0c3ba9f5137
--- /dev/null
+++ b/arch/arm64/kernel/debug-monitors.c
@@ -0,0 +1,288 @@
+/*
+ * ARMv8 single-step debug support and mdscr context switching.
+ *
+ * Copyright (C) 2012 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#include <linux/cpu.h>
+#include <linux/debugfs.h>
+#include <linux/hardirq.h>
+#include <linux/init.h>
+#include <linux/ptrace.h>
+#include <linux/stat.h>
+
+#include <asm/debug-monitors.h>
+#include <asm/local.h>
+#include <asm/cputype.h>
+#include <asm/system_misc.h>
+
+/* Low-level stepping controls. */
+#define DBG_MDSCR_SS            (1 << 0)
+#define DBG_SPSR_SS             (1 << 21)
+
+/* MDSCR_EL1 enabling bits */
+#define DBG_MDSCR_KDE           (1 << 13)
+#define DBG_MDSCR_MDE           (1 << 15)
+#define DBG_MDSCR_MASK          ~(DBG_MDSCR_KDE | DBG_MDSCR_MDE)
+
+/* Determine debug architecture. */
+u8 debug_monitors_arch(void)
+{
+        return read_cpuid(ID_AA64DFR0_EL1) & 0xf;
+}
+
+/*
+ * MDSCR access routines.
+ */
+static void mdscr_write(u32 mdscr)
+{
+        unsigned long flags;
+        local_dbg_save(flags);
+        asm volatile("msr mdscr_el1, %0" :: "r" (mdscr));
+        local_dbg_restore(flags);
+}
+
+static u32 mdscr_read(void)
+{
+        u32 mdscr;
+        asm volatile("mrs %0, mdscr_el1" : "=r" (mdscr));
+        return mdscr;
+}
+
+/*
+ * Allow root to disable self-hosted debug from userspace.
+ * This is useful if you want to connect an external JTAG debugger.
+ */
+static u32 debug_enabled = 1;
+
+static int create_debug_debugfs_entry(void)
+{
+        debugfs_create_bool("debug_enabled", 0644, NULL, &debug_enabled);
+        return 0;
+}
+fs_initcall(create_debug_debugfs_entry);
+
+static int __init early_debug_disable(char *buf)
+{
+        debug_enabled = 0;
+        return 0;
+}
+
+early_param("nodebugmon", early_debug_disable);
+
+/*
+ * Keep track of debug users on each core.
+ * The ref counts are per-cpu so we use a local_t type.
+ */
+static DEFINE_PER_CPU(local_t, mde_ref_count);
+static DEFINE_PER_CPU(local_t, kde_ref_count);
+
+void enable_debug_monitors(enum debug_el el)
+{
+        u32 mdscr, enable = 0;
+
+        WARN_ON(preemptible());
+
+        if (local_inc_return(&__get_cpu_var(mde_ref_count)) == 1)
+                enable = DBG_MDSCR_MDE;
+
+        if (el == DBG_ACTIVE_EL1 &&
+            local_inc_return(&__get_cpu_var(kde_ref_count)) == 1)
+                enable |= DBG_MDSCR_KDE;
+
+        if (enable && debug_enabled) {
+                mdscr = mdscr_read();
+                mdscr |= enable;
+                mdscr_write(mdscr);
+        }
+}
+
+void disable_debug_monitors(enum debug_el el)
+{
+        u32 mdscr, disable = 0;
+
+        WARN_ON(preemptible());
+
+        if (local_dec_and_test(&__get_cpu_var(mde_ref_count)))
+                disable = ~DBG_MDSCR_MDE;
+
+        if (el == DBG_ACTIVE_EL1 &&
+            local_dec_and_test(&__get_cpu_var(kde_ref_count)))
+                disable &= ~DBG_MDSCR_KDE;
+
+        if (disable) {
+                mdscr = mdscr_read();
+                mdscr &= disable;
+                mdscr_write(mdscr);
+        }
+}
+
+/*
+ * OS lock clearing.
+ */
+static void clear_os_lock(void *unused)
+{
+        asm volatile("msr mdscr_el1, %0" : : "r" (0));
+        isb();
+        asm volatile("msr oslar_el1, %0" : : "r" (0));
+        isb();
+}
+
+static int __cpuinit os_lock_notify(struct notifier_block *self,
+                                    unsigned long action, void *data)
+{
+        int cpu = (unsigned long)data;
+        if (action == CPU_ONLINE)
+                smp_call_function_single(cpu, clear_os_lock, NULL, 1);
+        return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata os_lock_nb = {
+        .notifier_call = os_lock_notify,
+};
+
+static int __cpuinit debug_monitors_init(void)
+{
+        /* Clear the OS lock. */
+        smp_call_function(clear_os_lock, NULL, 1);
+        clear_os_lock(NULL);
+
+        /* Register hotplug handler. */
+        register_cpu_notifier(&os_lock_nb);
+        return 0;
+}
+postcore_initcall(debug_monitors_init);
+
+/*
+ * Single step API and exception handling.
+ */
+static void set_regs_spsr_ss(struct pt_regs *regs)
+{
+        unsigned long spsr;
+
+        spsr = regs->pstate;
+        spsr &= ~DBG_SPSR_SS;
+        spsr |= DBG_SPSR_SS;
+        regs->pstate = spsr;
+}
+
+static void clear_regs_spsr_ss(struct pt_regs *regs)
+{
+        unsigned long spsr;
+
+        spsr = regs->pstate;
+        spsr &= ~DBG_SPSR_SS;
+        regs->pstate = spsr;
+}
+
+static int single_step_handler(unsigned long addr, unsigned int esr,
+                               struct pt_regs *regs)
+{
+        siginfo_t info;
+
+        /*
+         * If we are stepping a pending breakpoint, call the hw_breakpoint
+         * handler first.
+         */
+        if (!reinstall_suspended_bps(regs))
+                return 0;
+
+        if (user_mode(regs)) {
+                info.si_signo = SIGTRAP;
+                info.si_errno = 0;
+                info.si_code  = TRAP_HWBKPT;
+                info.si_addr  = (void __user *)instruction_pointer(regs);
+                force_sig_info(SIGTRAP, &info, current);
+
+                /*
+                 * ptrace will disable single step unless explicitly
+                 * asked to re-enable it. For other clients, it makes
+                 * sense to leave it enabled (i.e. rewind the controls
+                 * to the active-not-pending state).
+                 */
+                user_rewind_single_step(current);
+        } else {
+                /* TODO: route to KGDB */
+                pr_warning("Unexpected kernel single-step exception at EL1\n");
+                /*
+                 * Re-enable stepping since we know that we will be
+                 * returning to regs.
+                 */
+                set_regs_spsr_ss(regs);
+        }
+
+        return 0;
+}
+
+static int __init single_step_init(void)
+{
+        hook_debug_fault_code(DBG_ESR_EVT_HWSS, single_step_handler, SIGTRAP,
+                              TRAP_HWBKPT, "single-step handler");
+        return 0;
+}
+arch_initcall(single_step_init);
+
+/* Re-enable single step for syscall restarting. */
+void user_rewind_single_step(struct task_struct *task)
+{
+        /*
+         * If single step is active for this thread, then set SPSR.SS
+         * to 1 to avoid returning to the active-pending state.
+         */
+        if (test_ti_thread_flag(task_thread_info(task), TIF_SINGLESTEP))
+                set_regs_spsr_ss(task_pt_regs(task));
+}
+
+void user_fastforward_single_step(struct task_struct *task)
+{
+        if (test_ti_thread_flag(task_thread_info(task), TIF_SINGLESTEP))
+                clear_regs_spsr_ss(task_pt_regs(task));
+}
+
+/* Kernel API */
+void kernel_enable_single_step(struct pt_regs *regs)
+{
+        WARN_ON(!irqs_disabled());
+        set_regs_spsr_ss(regs);
+        mdscr_write(mdscr_read() | DBG_MDSCR_SS);
+        enable_debug_monitors(DBG_ACTIVE_EL1);
+}
+
+void kernel_disable_single_step(void)
+{
+        WARN_ON(!irqs_disabled());
+        mdscr_write(mdscr_read() & ~DBG_MDSCR_SS);
+        disable_debug_monitors(DBG_ACTIVE_EL1);
+}
+
+int kernel_active_single_step(void)
+{
+        WARN_ON(!irqs_disabled());
+        return mdscr_read() & DBG_MDSCR_SS;
+}
+
+/* ptrace API */
+void user_enable_single_step(struct task_struct *task)
+{
+        set_ti_thread_flag(task_thread_info(task), TIF_SINGLESTEP);
+        set_regs_spsr_ss(task_pt_regs(task));
+}
+
+void user_disable_single_step(struct task_struct *task)
+{
+        clear_ti_thread_flag(task_thread_info(task), TIF_SINGLESTEP);
+}
diff --git a/arch/arm64/kernel/entry-fpsimd.S b/arch/arm64/kernel/entry-fpsimd.S
new file mode 100644
index 00000000000..17988a6e7ea
--- /dev/null
+++ b/arch/arm64/kernel/entry-fpsimd.S
@@ -0,0 +1,80 @@
+/*
+ * FP/SIMD state saving and restoring
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/assembler.h>
+
+/*
+ * Save the FP registers.
+ *
+ * x0 - pointer to struct fpsimd_state
+ */
+ENTRY(fpsimd_save_state)
+        stp     q0, q1, [x0, #16 * 0]
+        stp     q2, q3, [x0, #16 * 2]
+        stp     q4, q5, [x0, #16 * 4]
+        stp     q6, q7, [x0, #16 * 6]
+        stp     q8, q9, [x0, #16 * 8]
+        stp     q10, q11, [x0, #16 * 10]
+        stp     q12, q13, [x0, #16 * 12]
+        stp     q14, q15, [x0, #16 * 14]
+        stp     q16, q17, [x0, #16 * 16]
+        stp     q18, q19, [x0, #16 * 18]
+        stp     q20, q21, [x0, #16 * 20]
+        stp     q22, q23, [x0, #16 * 22]
+        stp     q24, q25, [x0, #16 * 24]
+        stp     q26, q27, [x0, #16 * 26]
+        stp     q28, q29, [x0, #16 * 28]
+        stp     q30, q31, [x0, #16 * 30]!
+        mrs     x8, fpsr
+        str     w8, [x0, #16 * 2]
+        mrs     x8, fpcr
+        str     w8, [x0, #16 * 2 + 4]
+        ret
+ENDPROC(fpsimd_save_state)
+
+/*
+ * Load the FP registers.
+ *
+ * x0 - pointer to struct fpsimd_state
+ */
+ENTRY(fpsimd_load_state)
+        ldp     q0, q1, [x0, #16 * 0]
+        ldp     q2, q3, [x0, #16 * 2]
+        ldp     q4, q5, [x0, #16 * 4]
+        ldp     q6, q7, [x0, #16 * 6]
+        ldp     q8, q9, [x0, #16 * 8]
+        ldp     q10, q11, [x0, #16 * 10]
+        ldp     q12, q13, [x0, #16 * 12]
+        ldp     q14, q15, [x0, #16 * 14]
+        ldp     q16, q17, [x0, #16 * 16]
+        ldp     q18, q19, [x0, #16 * 18]
+        ldp     q20, q21, [x0, #16 * 20]
+        ldp     q22, q23, [x0, #16 * 22]
+        ldp     q24, q25, [x0, #16 * 24]
+        ldp     q26, q27, [x0, #16 * 26]
+        ldp     q28, q29, [x0, #16 * 28]
+        ldp     q30, q31, [x0, #16 * 30]!
+        ldr     w8, [x0, #16 * 2]
+        ldr     w9, [x0, #16 * 2 + 4]
+        msr     fpsr, x8
+        msr     fpcr, x9
+        ret
+ENDPROC(fpsimd_load_state)
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
new file mode 100644
index 00000000000..38cf853a366
--- /dev/null
+++ b/arch/arm64/kernel/entry.S
@@ -0,0 +1,695 @@
+/*
+ * Low-level exception handling code
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Authors:     Catalin Marinas <catalin.marinas@arm.com>
+ *              Will Deacon <will.deacon@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+
+#include <asm/assembler.h>
+#include <asm/asm-offsets.h>
+#include <asm/errno.h>
+#include <asm/thread_info.h>
+#include <asm/unistd.h>
+
+/*
+ * Bad Abort numbers
+ *-----------------
+ */
+#define BAD_SYNC        0
+#define BAD_IRQ         1
+#define BAD_FIQ         2
+#define BAD_ERROR       3
+
+        .macro  kernel_entry, el, regsize = 64
+        sub     sp, sp, #S_FRAME_SIZE - S_LR    // room for LR, SP, SPSR, ELR
+        .if     \regsize == 32
+        mov     w0, w0                          // zero upper 32 bits of x0
+        .endif
+        push    x28, x29
+        push    x26, x27
+        push    x24, x25
+        push    x22, x23
+        push    x20, x21
+        push    x18, x19
+        push    x16, x17
+        push    x14, x15
+        push    x12, x13
+        push    x10, x11
+        push    x8, x9
+        push    x6, x7
+        push    x4, x5
+        push    x2, x3
+        push    x0, x1
+        .if     \el == 0
+        mrs     x21, sp_el0
+        .else
+        add     x21, sp, #S_FRAME_SIZE
+        .endif
+        mrs     x22, elr_el1
+        mrs     x23, spsr_el1
+        stp     lr, x21, [sp, #S_LR]
+        stp     x22, x23, [sp, #S_PC]
+
+        /*
+         * Set syscallno to -1 by default (overridden later if real syscall).
+         */
+        .if     \el == 0
+        mvn     x21, xzr
+        str     x21, [sp, #S_SYSCALLNO]
+        .endif
+
+        /*
+         * Registers that may be useful after this macro is invoked:
+         *
+         * x21 - aborted SP
+         * x22 - aborted PC
+         * x23 - aborted PSTATE
+        */
+        .endm
+
+        .macro  kernel_exit, el, ret = 0
+        ldp     x21, x22, [sp, #S_PC]           // load ELR, SPSR
+        .if     \el == 0
+        ldr     x23, [sp, #S_SP]                // load return stack pointer
+        .endif
+        .if     \ret
+        ldr     x1, [sp, #S_X1]                 // preserve x0 (syscall return)
+        add     sp, sp, S_X2
+        .else
+        pop     x0, x1
+        .endif
+        pop     x2, x3                          // load the rest of the registers
+        pop     x4, x5
+        pop     x6, x7
+        pop     x8, x9
+        msr     elr_el1, x21                    // set up the return data
+        msr     spsr_el1, x22
+        .if     \el == 0
+        msr     sp_el0, x23
+        .endif
+        pop     x10, x11
+        pop     x12, x13
+        pop     x14, x15
+        pop     x16, x17
+        pop     x18, x19
+        pop     x20, x21
+        pop     x22, x23
+        pop     x24, x25
+        pop     x26, x27
+        pop     x28, x29
+        ldr     lr, [sp], #S_FRAME_SIZE - S_LR  // load LR and restore SP
+        eret                                    // return to kernel
+        .endm
+
+        .macro  get_thread_info, rd
+        mov     \rd, sp
+        and     \rd, \rd, #~((1 << 13) - 1)     // top of 8K stack
+        .endm
+
+/*
+ * These are the registers used in the syscall handler, and allow us to
+ * have in theory up to 7 arguments to a function - x0 to x6.
+ *
+ * x7 is reserved for the system call number in 32-bit mode.
+ */
+sc_nr   .req    x25             // number of system calls
+scno    .req    x26             // syscall number
+stbl    .req    x27             // syscall table pointer
+tsk     .req    x28             // current thread_info
+
+/*
+ * Interrupt handling.
+ */
+        .macro  irq_handler
+        ldr     x1, handle_arch_irq
+        mov     x0, sp
+        blr     x1
+        .endm
+
+        .text
+
+/*
+ * Exception vectors.
+ */
+        .macro  ventry  label
+        .align  7
+        b       \label
+        .endm
+
+        .align  11
+ENTRY(vectors)
+        ventry  el1_sync_invalid                // Synchronous EL1t
+        ventry  el1_irq_invalid                 // IRQ EL1t
+        ventry  el1_fiq_invalid                 // FIQ EL1t
+        ventry  el1_error_invalid               // Error EL1t
+
+        ventry  el1_sync                        // Synchronous EL1h
+        ventry  el1_irq                         // IRQ EL1h
+        ventry  el1_fiq_invalid                 // FIQ EL1h
+        ventry  el1_error_invalid               // Error EL1h
+
+        ventry  el0_sync                        // Synchronous 64-bit EL0
+        ventry  el0_irq                         // IRQ 64-bit EL0
+        ventry  el0_fiq_invalid                 // FIQ 64-bit EL0
+        ventry  el0_error_invalid               // Error 64-bit EL0
+
+#ifdef CONFIG_COMPAT
+        ventry  el0_sync_compat                 // Synchronous 32-bit EL0
+        ventry  el0_irq_compat                  // IRQ 32-bit EL0
+        ventry  el0_fiq_invalid_compat          // FIQ 32-bit EL0
+        ventry  el0_error_invalid_compat        // Error 32-bit EL0
+#else
+        ventry  el0_sync_invalid                // Synchronous 32-bit EL0
+        ventry  el0_irq_invalid                 // IRQ 32-bit EL0
+        ventry  el0_fiq_invalid                 // FIQ 32-bit EL0
+        ventry  el0_error_invalid               // Error 32-bit EL0
+#endif
+END(vectors)
+
+/*
+ * Invalid mode handlers
+ */
+        .macro  inv_entry, el, reason, regsize = 64
+        kernel_entry el, \regsize
+        mov     x0, sp
+        mov     x1, #\reason
+        mrs     x2, esr_el1
+        b       bad_mode
+        .endm
+
+el0_sync_invalid:
+        inv_entry 0, BAD_SYNC
+ENDPROC(el0_sync_invalid)
+
+el0_irq_invalid:
+        inv_entry 0, BAD_IRQ
+ENDPROC(el0_irq_invalid)
+
+el0_fiq_invalid:
+        inv_entry 0, BAD_FIQ
+ENDPROC(el0_fiq_invalid)
+
+el0_error_invalid:
+        inv_entry 0, BAD_ERROR
+ENDPROC(el0_error_invalid)
+
+#ifdef CONFIG_COMPAT
+el0_fiq_invalid_compat:
+        inv_entry 0, BAD_FIQ, 32
+ENDPROC(el0_fiq_invalid_compat)
+
+el0_error_invalid_compat:
+        inv_entry 0, BAD_ERROR, 32
+ENDPROC(el0_error_invalid_compat)
+#endif
+
+el1_sync_invalid:
+        inv_entry 1, BAD_SYNC
+ENDPROC(el1_sync_invalid)
+
+el1_irq_invalid:
+        inv_entry 1, BAD_IRQ
+ENDPROC(el1_irq_invalid)
+
+el1_fiq_invalid:
+        inv_entry 1, BAD_FIQ
+ENDPROC(el1_fiq_invalid)
+
+el1_error_invalid:
+        inv_entry 1, BAD_ERROR
+ENDPROC(el1_error_invalid)
+
+/*
+ * EL1 mode handlers.
+ */
+        .align  6
+el1_sync:
+        kernel_entry 1
+        mrs     x1, esr_el1                     // read the syndrome register
+        lsr     x24, x1, #26                    // exception class
+        cmp     x24, #0x25                      // data abort in EL1
+        b.eq    el1_da
+        cmp     x24, #0x18                      // configurable trap
+        b.eq    el1_undef
+        cmp     x24, #0x26                      // stack alignment exception
+        b.eq    el1_sp_pc
+        cmp     x24, #0x22                      // pc alignment exception
+        b.eq    el1_sp_pc
+        cmp     x24, #0x00                      // unknown exception in EL1
+        b.eq    el1_undef
+        cmp     x24, #0x30                      // debug exception in EL1
+        b.ge    el1_dbg
+        b       el1_inv
+el1_da:
+        /*
+         * Data abort handling
+         */
+        mrs     x0, far_el1
+        enable_dbg_if_not_stepping x2
+        // re-enable interrupts if they were enabled in the aborted context
+        tbnz    x23, #7, 1f                     // PSR_I_BIT
+        enable_irq
+1:
+        mov     x2, sp                          // struct pt_regs
+        bl      do_mem_abort
+
+        // disable interrupts before pulling preserved data off the stack
+        disable_irq
+        kernel_exit 1
+el1_sp_pc:
+        /*
+         * Stack or PC alignment exception handling
+         */
+        mrs     x0, far_el1
+        mov     x1, x25
+        mov     x2, sp
+        b       do_sp_pc_abort
+el1_undef:
+        /*
+         * Undefined instruction
+         */
+        mov     x0, sp
+        b       do_undefinstr
+el1_dbg:
+        /*
+         * Debug exception handling
+         */
+        tbz     x24, #0, el1_inv                // EL1 only
+        mrs     x0, far_el1
+        mov     x2, sp                          // struct pt_regs
+        bl      do_debug_exception
+
+        kernel_exit 1
+el1_inv:
+        // TODO: add support for undefined instructions in kernel mode
+        mov     x0, sp
+        mov     x1, #BAD_SYNC
+        mrs     x2, esr_el1
+        b       bad_mode
+ENDPROC(el1_sync)
+
+        .align  6
+el1_irq:
+        kernel_entry 1
+        enable_dbg_if_not_stepping x0
+#ifdef CONFIG_TRACE_IRQFLAGS
+        bl      trace_hardirqs_off
+#endif
+#ifdef CONFIG_PREEMPT
+        get_thread_info tsk
+        ldr     x24, [tsk, #TI_PREEMPT]         // get preempt count
+        add     x0, x24, #1                     // increment it
+        str     x0, [tsk, #TI_PREEMPT]
+#endif
+        irq_handler
+#ifdef CONFIG_PREEMPT
+        str     x24, [tsk, #TI_PREEMPT]         // restore preempt count
+        cbnz    x24, 1f                         // preempt count != 0
+        ldr     x0, [tsk, #TI_FLAGS]            // get flags
+        tbz     x0, #TIF_NEED_RESCHED, 1f       // needs rescheduling?
+        bl      el1_preempt
+1:
+#endif
+#ifdef CONFIG_TRACE_IRQFLAGS
+        bl      trace_hardirqs_on
+#endif
+        kernel_exit 1
+ENDPROC(el1_irq)
+
+#ifdef CONFIG_PREEMPT
+el1_preempt:
+        mov     x24, lr
+1:      enable_dbg
+        bl      preempt_schedule_irq            // irq en/disable is done inside
+        ldr     x0, [tsk, #TI_FLAGS]            // get new tasks TI_FLAGS
+        tbnz    x0, #TIF_NEED_RESCHED, 1b       // needs rescheduling?
+        ret     x24
+#endif
+
+/*
+ * EL0 mode handlers.
+ */
+        .align  6
+el0_sync:
+        kernel_entry 0
+        mrs     x25, esr_el1                    // read the syndrome register
+        lsr     x24, x25, #26                   // exception class
+        cmp     x24, #0x15                      // SVC in 64-bit state
+        b.eq    el0_svc
+        adr     lr, ret_from_exception
+        cmp     x24, #0x24                      // data abort in EL0
+        b.eq    el0_da
+        cmp     x24, #0x20                      // instruction abort in EL0
+        b.eq    el0_ia
+        cmp     x24, #0x07                      // FP/ASIMD access
+        b.eq    el0_fpsimd_acc
+        cmp     x24, #0x2c                      // FP/ASIMD exception
+        b.eq    el0_fpsimd_exc
+        cmp     x24, #0x18                      // configurable trap
+        b.eq    el0_undef
+        cmp     x24, #0x26                      // stack alignment exception
+        b.eq    el0_sp_pc
+        cmp     x24, #0x22                      // pc alignment exception
+        b.eq    el0_sp_pc
+        cmp     x24, #0x00                      // unknown exception in EL0
+        b.eq    el0_undef
+        cmp     x24, #0x30                      // debug exception in EL0
+        b.ge    el0_dbg
+        b       el0_inv
+
+#ifdef CONFIG_COMPAT
+        .align  6
+el0_sync_compat:
+        kernel_entry 0, 32
+        mrs     x25, esr_el1                    // read the syndrome register
+        lsr     x24, x25, #26                   // exception class
+        cmp     x24, #0x11                      // SVC in 32-bit state
+        b.eq    el0_svc_compat
+        adr     lr, ret_from_exception
+        cmp     x24, #0x24                      // data abort in EL0
+        b.eq    el0_da
+        cmp     x24, #0x20                      // instruction abort in EL0
+        b.eq    el0_ia
+        cmp     x24, #0x07                      // FP/ASIMD access
+        b.eq    el0_fpsimd_acc
+        cmp     x24, #0x28                      // FP/ASIMD exception
+        b.eq    el0_fpsimd_exc
+        cmp     x24, #0x00                      // unknown exception in EL0
+        b.eq    el0_undef
+        cmp     x24, #0x30                      // debug exception in EL0
+        b.ge    el0_dbg
+        b       el0_inv
+el0_svc_compat:
+        /*
+         * AArch32 syscall handling
+         */
+        adr     stbl, compat_sys_call_table     // load compat syscall table pointer
+        uxtw    scno, w7                        // syscall number in w7 (r7)
+        mov     sc_nr, #__NR_compat_syscalls
+        b       el0_svc_naked
+
+        .align  6
+el0_irq_compat:
+        kernel_entry 0, 32
+        b       el0_irq_naked
+#endif
+
+el0_da:
+        /*
+         * Data abort handling
+         */
+        mrs     x0, far_el1
+        disable_step x1
+        isb
+        enable_dbg
+        // enable interrupts before calling the main handler
+        enable_irq
+        mov     x1, x25
+        mov     x2, sp
+        b       do_mem_abort
+el0_ia:
+        /*
+         * Instruction abort handling
+         */
+        mrs     x0, far_el1
+        disable_step x1
+        isb
+        enable_dbg
+        // enable interrupts before calling the main handler
+        enable_irq
+        orr     x1, x25, #1 << 24               // use reserved ISS bit for instruction aborts
+        mov     x2, sp
+        b       do_mem_abort
+el0_fpsimd_acc:
+        /*
+         * Floating Point or Advanced SIMD access
+         */
+        mov     x0, x25
+        mov     x1, sp
+        b       do_fpsimd_acc
+el0_fpsimd_exc:
+        /*
+         * Floating Point or Advanced SIMD exception
+         */
+        mov     x0, x25
+        mov     x1, sp
+        b       do_fpsimd_exc
+el0_sp_pc:
+        /*
+         * Stack or PC alignment exception handling
+         */
+        mrs     x0, far_el1
+        disable_step x1
+        isb
+        enable_dbg
+        // enable interrupts before calling the main handler
+        enable_irq
+        mov     x1, x25
+        mov     x2, sp
+        b       do_sp_pc_abort
+el0_undef:
+        /*
+         * Undefined instruction
+         */
+        mov     x0, sp
+        b       do_undefinstr
+el0_dbg:
+        /*
+         * Debug exception handling
+         */
+        tbnz    x24, #0, el0_inv                // EL0 only
+        mrs     x0, far_el1
+        disable_step x1
+        mov     x1, x25
+        mov     x2, sp
+        b       do_debug_exception
+el0_inv:
+        mov     x0, sp
+        mov     x1, #BAD_SYNC
+        mrs     x2, esr_el1
+        b       bad_mode
+ENDPROC(el0_sync)
+
+        .align  6
+el0_irq:
+        kernel_entry 0
+el0_irq_naked:
+        disable_step x1
+        isb
+        enable_dbg
+#ifdef CONFIG_TRACE_IRQFLAGS
+        bl      trace_hardirqs_off
+#endif
+        get_thread_info tsk
+#ifdef CONFIG_PREEMPT
+        ldr     x24, [tsk, #TI_PREEMPT]         // get preempt count
+        add     x23, x24, #1                    // increment it
+        str     x23, [tsk, #TI_PREEMPT]
+#endif
+        irq_handler
+#ifdef CONFIG_PREEMPT
+        ldr     x0, [tsk, #TI_PREEMPT]
+        str     x24, [tsk, #TI_PREEMPT]
+        cmp     x0, x23
+        b.eq    1f
+        mov     x1, #0
+        str     x1, [x1]                        // BUG
+1:
+#endif
+#ifdef CONFIG_TRACE_IRQFLAGS
+        bl      trace_hardirqs_on
+#endif
+        b       ret_to_user
+ENDPROC(el0_irq)
+
+/*
+ * This is the return code to user mode for abort handlers
+ */
+ret_from_exception:
+        get_thread_info tsk
+        b       ret_to_user
+ENDPROC(ret_from_exception)
+
+/*
+ * Register switch for AArch64. The callee-saved registers need to be saved
+ * and restored. On entry:
+ *   x0 = previous task_struct (must be preserved across the switch)
+ *   x1 = next task_struct
+ * Previous and next are guaranteed not to be the same.
+ *
+ */
+ENTRY(cpu_switch_to)
+        add     x8, x0, #THREAD_CPU_CONTEXT
+        mov     x9, sp
+        stp     x19, x20, [x8], #16             // store callee-saved registers
+        stp     x21, x22, [x8], #16
+        stp     x23, x24, [x8], #16
+        stp     x25, x26, [x8], #16
+        stp     x27, x28, [x8], #16
+        stp     x29, x9, [x8], #16
+        str     lr, [x8]
+        add     x8, x1, #THREAD_CPU_CONTEXT
+        ldp     x19, x20, [x8], #16             // restore callee-saved registers
+        ldp     x21, x22, [x8], #16
+        ldp     x23, x24, [x8], #16
+        ldp     x25, x26, [x8], #16
+        ldp     x27, x28, [x8], #16
+        ldp     x29, x9, [x8], #16
+        ldr     lr, [x8]
+        mov     sp, x9
+        ret
+ENDPROC(cpu_switch_to)
+
+/*
+ * This is the fast syscall return path.  We do as little as possible here,
+ * and this includes saving x0 back into the kernel stack.
+ */
+ret_fast_syscall:
+        disable_irq                             // disable interrupts
+        ldr     x1, [tsk, #TI_FLAGS]
+        and     x2, x1, #_TIF_WORK_MASK
+        cbnz    x2, fast_work_pending
+        tbz     x1, #TIF_SINGLESTEP, fast_exit
+        disable_dbg
+        enable_step x2
+fast_exit:
+        kernel_exit 0, ret = 1
+
+/*
+ * Ok, we need to do extra processing, enter the slow path.
+ */
+fast_work_pending:
+        str     x0, [sp, #S_X0]                 // returned x0
+work_pending:
+        tbnz    x1, #TIF_NEED_RESCHED, work_resched
+        /* TIF_SIGPENDING or TIF_NOTIFY_RESUME case */
+        ldr     x2, [sp, #S_PSTATE]
+        mov     x0, sp                          // 'regs'
+        tst     x2, #PSR_MODE_MASK              // user mode regs?
+        b.ne    no_work_pending                 // returning to kernel
+        bl      do_notify_resume
+        b       ret_to_user
+work_resched:
+        enable_dbg
+        bl      schedule
+
+/*
+ * "slow" syscall return path.
+ */
+ENTRY(ret_to_user)
+        disable_irq                             // disable interrupts
+        ldr     x1, [tsk, #TI_FLAGS]
+        and     x2, x1, #_TIF_WORK_MASK
+        cbnz    x2, work_pending
+        tbz     x1, #TIF_SINGLESTEP, no_work_pending
+        disable_dbg
+        enable_step x2
+no_work_pending:
+        kernel_exit 0, ret = 0
+ENDPROC(ret_to_user)
+
+/*
+ * This is how we return from a fork.
+ */
+ENTRY(ret_from_fork)
+        bl      schedule_tail
+        get_thread_info tsk
+        b       ret_to_user
+ENDPROC(ret_from_fork)
+
+/*
+ * SVC handler.
+ */
+        .align  6
+el0_svc:
+        adrp    stbl, sys_call_table            // load syscall table pointer
+        uxtw    scno, w8                        // syscall number in w8
+        mov     sc_nr, #__NR_syscalls
+el0_svc_naked:                                  // compat entry point
+        stp     x0, scno, [sp, #S_ORIG_X0]      // save the original x0 and syscall number
+        disable_step x16
+        isb
+        enable_dbg
+        enable_irq
+
+        get_thread_info tsk
+        ldr     x16, [tsk, #TI_FLAGS]           // check for syscall tracing
+        tbnz    x16, #TIF_SYSCALL_TRACE, __sys_trace // are we tracing syscalls?
+        adr     lr, ret_fast_syscall            // return address
+        cmp     scno, sc_nr                     // check upper syscall limit
+        b.hs    ni_sys
+        ldr     x16, [stbl, scno, lsl #3]       // address in the syscall table
+        br      x16                             // call sys_* routine
+ni_sys:
+        mov     x0, sp
+        b       do_ni_syscall
+ENDPROC(el0_svc)
+
+        /*
+         * This is the really slow path.  We're going to be doing context
+         * switches, and waiting for our parent to respond.
+         */
+__sys_trace:
+        mov     x1, sp
+        mov     w0, #0                          // trace entry
+        bl      syscall_trace
+        adr     lr, __sys_trace_return          // return address
+        uxtw    scno, w0                        // syscall number (possibly new)
+        mov     x1, sp                          // pointer to regs
+        cmp     scno, sc_nr                     // check upper syscall limit
+        b.hs    ni_sys
+        ldp     x0, x1, [sp]                    // restore the syscall args
+        ldp     x2, x3, [sp, #S_X2]
+        ldp     x4, x5, [sp, #S_X4]
+        ldp     x6, x7, [sp, #S_X6]
+        ldr     x16, [stbl, scno, lsl #3]       // address in the syscall table
+        br      x16                             // call sys_* routine
+
+__sys_trace_return:
+        str     x0, [sp]                        // save returned x0
+        mov     x1, sp
+        mov     w0, #1                          // trace exit
+        bl      syscall_trace
+        b       ret_to_user
+
+/*
+ * Special system call wrappers.
+ */
+ENTRY(sys_execve_wrapper)
+        mov     x3, sp
+        b       sys_execve
+ENDPROC(sys_execve_wrapper)
+
+ENTRY(sys_clone_wrapper)
+        mov     x5, sp
+        b       sys_clone
+ENDPROC(sys_clone_wrapper)
+
+ENTRY(sys_rt_sigreturn_wrapper)
+        mov     x0, sp
+        b       sys_rt_sigreturn
+ENDPROC(sys_rt_sigreturn_wrapper)
+
+ENTRY(sys_sigaltstack_wrapper)
+        ldr     x2, [sp, #S_SP]
+        b       sys_sigaltstack
+ENDPROC(sys_sigaltstack_wrapper)
+
+ENTRY(handle_arch_irq)
+        .quad   0
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
new file mode 100644
index 00000000000..e8b8357aedb
--- /dev/null
+++ b/arch/arm64/kernel/fpsimd.c
@@ -0,0 +1,106 @@
+/*
+ * FP/SIMD context switching and fault handling
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+
+#include <asm/fpsimd.h>
+#include <asm/cputype.h>
+
+#define FPEXC_IOF       (1 << 0)
+#define FPEXC_DZF       (1 << 1)
+#define FPEXC_OFF       (1 << 2)
+#define FPEXC_UFF       (1 << 3)
+#define FPEXC_IXF       (1 << 4)
+#define FPEXC_IDF       (1 << 7)
+
+/*
+ * Trapped FP/ASIMD access.
+ */
+void do_fpsimd_acc(unsigned int esr, struct pt_regs *regs)
+{
+        /* TODO: implement lazy context saving/restoring */
+        WARN_ON(1);
+}
+
+/*
+ * Raise a SIGFPE for the current process.
+ */
+void do_fpsimd_exc(unsigned int esr, struct pt_regs *regs)
+{
+        siginfo_t info;
+        unsigned int si_code = 0;
+
+        if (esr & FPEXC_IOF)
+                si_code = FPE_FLTINV;
+        else if (esr & FPEXC_DZF)
+                si_code = FPE_FLTDIV;
+        else if (esr & FPEXC_OFF)
+                si_code = FPE_FLTOVF;
+        else if (esr & FPEXC_UFF)
+                si_code = FPE_FLTUND;
+        else if (esr & FPEXC_IXF)
+                si_code = FPE_FLTRES;
+
+        memset(&info, 0, sizeof(info));
+        info.si_signo = SIGFPE;
+        info.si_code = si_code;
+        info.si_addr = (void __user *)instruction_pointer(regs);
+
+        send_sig_info(SIGFPE, &info, current);
+}
+
+void fpsimd_thread_switch(struct task_struct *next)
+{
+        /* check if not kernel threads */
+        if (current->mm)
+                fpsimd_save_state(&current->thread.fpsimd_state);
+        if (next->mm)
+                fpsimd_load_state(&next->thread.fpsimd_state);
+}
+
+void fpsimd_flush_thread(void)
+{
+        memset(&current->thread.fpsimd_state, 0, sizeof(struct fpsimd_state));
+        fpsimd_load_state(&current->thread.fpsimd_state);
+}
+
+/*
+ * FP/SIMD support code initialisation.
+ */
+static int __init fpsimd_init(void)
+{
+        u64 pfr = read_cpuid(ID_AA64PFR0_EL1);
+
+        if (pfr & (0xf << 16)) {
+                pr_notice("Floating-point is not implemented\n");
+                return 0;
+        }
+        elf_hwcap |= HWCAP_FP;
+
+        if (pfr & (0xf << 20))
+                pr_notice("Advanced SIMD is not implemented\n");
+        else
+                elf_hwcap |= HWCAP_ASIMD;
+
+        return 0;
+}
+late_initcall(fpsimd_init);
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
new file mode 100644
index 00000000000..a2f02b63eae
--- /dev/null
+++ b/arch/arm64/kernel/head.S
@@ -0,0 +1,510 @@
+/*
+ * Low-level CPU initialisation
+ * Based on arch/arm/kernel/head.S
+ *
+ * Copyright (C) 1994-2002 Russell King
+ * Copyright (C) 2003-2012 ARM Ltd.
+ * Authors:     Catalin Marinas <catalin.marinas@arm.com>
+ *              Will Deacon <will.deacon@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+
+#include <asm/assembler.h>
+#include <asm/ptrace.h>
+#include <asm/asm-offsets.h>
+#include <asm/memory.h>
+#include <asm/thread_info.h>
+#include <asm/pgtable-hwdef.h>
+#include <asm/pgtable.h>
+#include <asm/page.h>
+
+/*
+ * swapper_pg_dir is the virtual address of the initial page table. We place
+ * the page tables 3 * PAGE_SIZE below KERNEL_RAM_VADDR. The idmap_pg_dir has
+ * 2 pages and is placed below swapper_pg_dir.
+ */
+#define KERNEL_RAM_VADDR        (PAGE_OFFSET + TEXT_OFFSET)
+
+#if (KERNEL_RAM_VADDR & 0xfffff) != 0x80000
+#error KERNEL_RAM_VADDR must start at 0xXXX80000
+#endif
+
+#define SWAPPER_DIR_SIZE        (3 * PAGE_SIZE)
+#define IDMAP_DIR_SIZE          (2 * PAGE_SIZE)
+
+        .globl  swapper_pg_dir
+        .equ    swapper_pg_dir, KERNEL_RAM_VADDR - SWAPPER_DIR_SIZE
+
+        .globl  idmap_pg_dir
+        .equ    idmap_pg_dir, swapper_pg_dir - IDMAP_DIR_SIZE
+
+        .macro  pgtbl, ttb0, ttb1, phys
+        add     \ttb1, \phys, #TEXT_OFFSET - SWAPPER_DIR_SIZE
+        sub     \ttb0, \ttb1, #IDMAP_DIR_SIZE
+        .endm
+
+#ifdef CONFIG_ARM64_64K_PAGES
+#define BLOCK_SHIFT     PAGE_SHIFT
+#define BLOCK_SIZE      PAGE_SIZE
+#else
+#define BLOCK_SHIFT     SECTION_SHIFT
+#define BLOCK_SIZE      SECTION_SIZE
+#endif
+
+#define KERNEL_START    KERNEL_RAM_VADDR
+#define KERNEL_END      _end
+
+/*
+ * Initial memory map attributes.
+ */
+#ifndef CONFIG_SMP
+#define PTE_FLAGS       PTE_TYPE_PAGE | PTE_AF
+#define PMD_FLAGS       PMD_TYPE_SECT | PMD_SECT_AF
+#else
+#define PTE_FLAGS       PTE_TYPE_PAGE | PTE_AF | PTE_SHARED
+#define PMD_FLAGS       PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S
+#endif
+
+#ifdef CONFIG_ARM64_64K_PAGES
+#define MM_MMUFLAGS     PTE_ATTRINDX(MT_NORMAL) | PTE_FLAGS
+#define IO_MMUFLAGS     PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_XN | PTE_FLAGS
+#else
+#define MM_MMUFLAGS     PMD_ATTRINDX(MT_NORMAL) | PMD_FLAGS
+#define IO_MMUFLAGS     PMD_ATTRINDX(MT_DEVICE_nGnRE) | PMD_SECT_XN | PMD_FLAGS
+#endif
+
+/*
+ * Kernel startup entry point.
+ * ---------------------------
+ *
+ * The requirements are:
+ *   MMU = off, D-cache = off, I-cache = on or off,
+ *   x0 = physical address to the FDT blob.
+ *
+ * This code is mostly position independent so you call this at
+ * __pa(PAGE_OFFSET + TEXT_OFFSET).
+ *
+ * Note that the callee-saved registers are used for storing variables
+ * that are useful before the MMU is enabled. The allocations are described
+ * in the entry routines.
+ */
+        __HEAD
+
+        /*
+         * DO NOT MODIFY. Image header expected by Linux boot-loaders.
+         */
+        b       stext                           // branch to kernel start, magic
+        .long   0                               // reserved
+        .quad   TEXT_OFFSET                     // Image load offset from start of RAM
+        .quad   0                               // reserved
+        .quad   0                               // reserved
+
+ENTRY(stext)
+        mov     x21, x0                         // x21=FDT
+        bl      el2_setup                       // Drop to EL1
+        mrs     x22, midr_el1                   // x22=cpuid
+        mov     x0, x22
+        bl      lookup_processor_type
+        mov     x23, x0                         // x23=current cpu_table
+        cbz     x23, __error_p                  // invalid processor (x23=0)?
+        bl      __calc_phys_offset              // x24=PHYS_OFFSET, x28=PHYS_OFFSET-PAGE_OFFSET
+        bl      __vet_fdt
+        bl      __create_page_tables            // x25=TTBR0, x26=TTBR1
+        /*
+         * The following calls CPU specific code in a position independent
+         * manner. See arch/arm64/mm/proc.S for details. x23 = base of
+         * cpu_info structure selected by lookup_processor_type above.
+         * On return, the CPU will be ready for the MMU to be turned on and
+         * the TCR will have been set.
+         */
+        ldr     x27, __switch_data              // address to jump to after
+                                                // MMU has been enabled
+        adr     lr, __enable_mmu                // return (PIC) address
+        ldr     x12, [x23, #CPU_INFO_SETUP]
+        add     x12, x12, x28                   // __virt_to_phys
+        br      x12                             // initialise processor
+ENDPROC(stext)
+
+/*
+ * If we're fortunate enough to boot at EL2, ensure that the world is
+ * sane before dropping to EL1.
+ */
+ENTRY(el2_setup)
+        mrs     x0, CurrentEL
+        cmp     x0, #PSR_MODE_EL2t
+        ccmp    x0, #PSR_MODE_EL2h, #0x4, ne
+        b.eq    1f
+        ret
+
+        /* Hyp configuration. */
+1:      mov     x0, #(1 << 31)                  // 64-bit EL1
+        msr     hcr_el2, x0
+
+        /* Generic timers. */
+        mrs     x0, cnthctl_el2
+        orr     x0, x0, #3                      // Enable EL1 physical timers
+        msr     cnthctl_el2, x0
+
+        /* Populate ID registers. */
+        mrs     x0, midr_el1
+        mrs     x1, mpidr_el1
+        msr     vpidr_el2, x0
+        msr     vmpidr_el2, x1
+
+        /* sctlr_el1 */
+        mov     x0, #0x0800                     // Set/clear RES{1,0} bits
+        movk    x0, #0x30d0, lsl #16
+        msr     sctlr_el1, x0
+
+        /* Coprocessor traps. */
+        mov     x0, #0x33ff
+        msr     cptr_el2, x0                    // Disable copro. traps to EL2
+
+#ifdef CONFIG_COMPAT
+        msr     hstr_el2, xzr                   // Disable CP15 traps to EL2
+#endif
+
+        /* spsr */
+        mov     x0, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\
+                      PSR_MODE_EL1h)
+        msr     spsr_el2, x0
+        msr     elr_el2, lr
+        eret
+ENDPROC(el2_setup)
+
+        .align  3
+2:      .quad   .
+        .quad   PAGE_OFFSET
+
+#ifdef CONFIG_SMP
+        .pushsection    .smp.pen.text, "ax"
+        .align  3
+1:      .quad   .
+        .quad   secondary_holding_pen_release
+
+        /*
+         * This provides a "holding pen" for platforms to hold all secondary
+         * cores are held until we're ready for them to initialise.
+         */
+ENTRY(secondary_holding_pen)
+        bl      el2_setup                       // Drop to EL1
+        mrs     x0, mpidr_el1
+        and     x0, x0, #15                     // CPU number
+        adr     x1, 1b
+        ldp     x2, x3, [x1]
+        sub     x1, x1, x2
+        add     x3, x3, x1
+pen:    ldr     x4, [x3]
+        cmp     x4, x0
+        b.eq    secondary_startup
+        wfe
+        b       pen
+ENDPROC(secondary_holding_pen)
+        .popsection
+
+ENTRY(secondary_startup)
+        /*
+         * Common entry point for secondary CPUs.
+         */
+        mrs     x22, midr_el1                   // x22=cpuid
+        mov     x0, x22
+        bl      lookup_processor_type
+        mov     x23, x0                         // x23=current cpu_table
+        cbz     x23, __error_p                  // invalid processor (x23=0)?
+
+        bl      __calc_phys_offset              // x24=phys offset
+        pgtbl   x25, x26, x24                   // x25=TTBR0, x26=TTBR1
+        ldr     x12, [x23, #CPU_INFO_SETUP]
+        add     x12, x12, x28                   // __virt_to_phys
+        blr     x12                             // initialise processor
+
+        ldr     x21, =secondary_data
+        ldr     x27, =__secondary_switched      // address to jump to after enabling the MMU
+        b       __enable_mmu
+ENDPROC(secondary_startup)
+
+ENTRY(__secondary_switched)
+        ldr     x0, [x21]                       // get secondary_data.stack
+        mov     sp, x0
+        mov     x29, #0
+        b       secondary_start_kernel
+ENDPROC(__secondary_switched)
+#endif  /* CONFIG_SMP */
+
+/*
+ * Setup common bits before finally enabling the MMU. Essentially this is just
+ * loading the page table pointer and vector base registers.
+ *
+ * On entry to this code, x0 must contain the SCTLR_EL1 value for turning on
+ * the MMU.
+ */
+__enable_mmu:
+        ldr     x5, =vectors
+        msr     vbar_el1, x5
+        msr     ttbr0_el1, x25                  // load TTBR0
+        msr     ttbr1_el1, x26                  // load TTBR1
+        isb
+        b       __turn_mmu_on
+ENDPROC(__enable_mmu)
+
+/*
+ * Enable the MMU. This completely changes the structure of the visible memory
+ * space. You will not be able to trace execution through this.
+ *
+ *  x0  = system control register
+ *  x27 = *virtual* address to jump to upon completion
+ *
+ * other registers depend on the function called upon completion
+ */
+        .align  6
+__turn_mmu_on:
+        msr     sctlr_el1, x0
+        isb
+        br      x27
+ENDPROC(__turn_mmu_on)
+
+/*
+ * Calculate the start of physical memory.
+ */
+__calc_phys_offset:
+        adr     x0, 1f
+        ldp     x1, x2, [x0]
+        sub     x28, x0, x1                     // x28 = PHYS_OFFSET - PAGE_OFFSET
+        add     x24, x2, x28                    // x24 = PHYS_OFFSET
+        ret
+ENDPROC(__calc_phys_offset)
+
+        .align 3
+1:      .quad   .
+        .quad   PAGE_OFFSET
+
+/*
+ * Macro to populate the PGD for the corresponding block entry in the next
+ * level (tbl) for the given virtual address.
+ *
+ * Preserves:   pgd, tbl, virt
+ * Corrupts:    tmp1, tmp2
+ */
+        .macro  create_pgd_entry, pgd, tbl, virt, tmp1, tmp2
+        lsr     \tmp1, \virt, #PGDIR_SHIFT
+        and     \tmp1, \tmp1, #PTRS_PER_PGD - 1 // PGD index
+        orr     \tmp2, \tbl, #3                 // PGD entry table type
+        str     \tmp2, [\pgd, \tmp1, lsl #3]
+        .endm
+
+/*
+ * Macro to populate block entries in the page table for the start..end
+ * virtual range (inclusive).
+ *
+ * Preserves:   tbl, flags
+ * Corrupts:    phys, start, end, pstate
+ */
+        .macro  create_block_map, tbl, flags, phys, start, end, idmap=0
+        lsr     \phys, \phys, #BLOCK_SHIFT
+        .if     \idmap
+        and     \start, \phys, #PTRS_PER_PTE - 1        // table index
+        .else
+        lsr     \start, \start, #BLOCK_SHIFT
+        and     \start, \start, #PTRS_PER_PTE - 1       // table index
+        .endif
+        orr     \phys, \flags, \phys, lsl #BLOCK_SHIFT  // table entry
+        .ifnc   \start,\end
+        lsr     \end, \end, #BLOCK_SHIFT
+        and     \end, \end, #PTRS_PER_PTE - 1           // table end index
+        .endif
+9999:   str     \phys, [\tbl, \start, lsl #3]           // store the entry
+        .ifnc   \start,\end
+        add     \start, \start, #1                      // next entry
+        add     \phys, \phys, #BLOCK_SIZE               // next block
+        cmp     \start, \end
+        b.ls    9999b
+        .endif
+        .endm
+
+/*
+ * Setup the initial page tables. We only setup the barest amount which is
+ * required to get the kernel running. The following sections are required:
+ *   - identity mapping to enable the MMU (low address, TTBR0)
+ *   - first few MB of the kernel linear mapping to jump to once the MMU has
+ *     been enabled, including the FDT blob (TTBR1)
+ */
+__create_page_tables:
+        pgtbl   x25, x26, x24                   // idmap_pg_dir and swapper_pg_dir addresses
+
+        /*
+         * Clear the idmap and swapper page tables.
+         */
+        mov     x0, x25
+        add     x6, x26, #SWAPPER_DIR_SIZE
+1:      stp     xzr, xzr, [x0], #16
+        stp     xzr, xzr, [x0], #16
+        stp     xzr, xzr, [x0], #16
+        stp     xzr, xzr, [x0], #16
+        cmp     x0, x6
+        b.lo    1b
+
+        ldr     x7, =MM_MMUFLAGS
+
+        /*
+         * Create the identity mapping.
+         */
+        add     x0, x25, #PAGE_SIZE             // section table address
+        adr     x3, __turn_mmu_on               // virtual/physical address
+        create_pgd_entry x25, x0, x3, x5, x6
+        create_block_map x0, x7, x3, x5, x5, idmap=1
+
+        /*
+         * Map the kernel image (starting with PHYS_OFFSET).
+         */
+        add     x0, x26, #PAGE_SIZE             // section table address
+        mov     x5, #PAGE_OFFSET
+        create_pgd_entry x26, x0, x5, x3, x6
+        ldr     x6, =KERNEL_END - 1
+        mov     x3, x24                         // phys offset
+        create_block_map x0, x7, x3, x5, x6
+
+        /*
+         * Map the FDT blob (maximum 2MB; must be within 512MB of
+         * PHYS_OFFSET).
+         */
+        mov     x3, x21                         // FDT phys address
+        and     x3, x3, #~((1 << 21) - 1)       // 2MB aligned
+        mov     x6, #PAGE_OFFSET
+        sub     x5, x3, x24                     // subtract PHYS_OFFSET
+        tst     x5, #~((1 << 29) - 1)           // within 512MB?
+        csel    x21, xzr, x21, ne               // zero the FDT pointer
+        b.ne    1f
+        add     x5, x5, x6                      // __va(FDT blob)
+        add     x6, x5, #1 << 21                // 2MB for the FDT blob
+        sub     x6, x6, #1                      // inclusive range
+        create_block_map x0, x7, x3, x5, x6
+1:
+        ret
+ENDPROC(__create_page_tables)
+        .ltorg
+
+        .align  3
+        .type   __switch_data, %object
+__switch_data:
+        .quad   __mmap_switched
+        .quad   __data_loc                      // x4
+        .quad   _data                           // x5
+        .quad   __bss_start                     // x6
+        .quad   _end                            // x7
+        .quad   processor_id                    // x4
+        .quad   __fdt_pointer                   // x5
+        .quad   memstart_addr                   // x6
+        .quad   init_thread_union + THREAD_START_SP // sp
+
+/*
+ * The following fragment of code is executed with the MMU on in MMU mode, and
+ * uses absolute addresses; this is not position independent.
+ */
+__mmap_switched:
+        adr     x3, __switch_data + 8
+
+        ldp     x4, x5, [x3], #16
+        ldp     x6, x7, [x3], #16
+        cmp     x4, x5                          // Copy data segment if needed
+1:      ccmp    x5, x6, #4, ne
+        b.eq    2f
+        ldr     x16, [x4], #8
+        str     x16, [x5], #8
+        b       1b
+2:
+1:      cmp     x6, x7
+        b.hs    2f
+        str     xzr, [x6], #8                   // Clear BSS
+        b       1b
+2:
+        ldp     x4, x5, [x3], #16
+        ldr     x6, [x3], #8
+        ldr     x16, [x3]
+        mov     sp, x16
+        str     x22, [x4]                       // Save processor ID
+        str     x21, [x5]                       // Save FDT pointer
+        str     x24, [x6]                       // Save PHYS_OFFSET
+        mov     x29, #0
+        b       start_kernel
+ENDPROC(__mmap_switched)
+
+/*
+ * Exception handling. Something went wrong and we can't proceed. We ought to
+ * tell the user, but since we don't have any guarantee that we're even
+ * running on the right architecture, we do virtually nothing.
+ */
+__error_p:
+ENDPROC(__error_p)
+
+__error:
+1:      nop
+        b       1b
+ENDPROC(__error)
+
+/*
+ * This function gets the processor ID in w0 and searches the cpu_table[] for
+ * a match. It returns a pointer to the struct cpu_info it found. The
+ * cpu_table[] must end with an empty (all zeros) structure.
+ *
+ * This routine can be called via C code and it needs to work with the MMU
+ * both disabled and enabled (the offset is calculated automatically).
+ */
+ENTRY(lookup_processor_type)
+        adr     x1, __lookup_processor_type_data
+        ldp     x2, x3, [x1]
+        sub     x1, x1, x2                      // get offset between VA and PA
+        add     x3, x3, x1                      // convert VA to PA
+1:
+        ldp     w5, w6, [x3]                    // load cpu_id_val and cpu_id_mask
+        cbz     w5, 2f                          // end of list?
+        and     w6, w6, w0
+        cmp     w5, w6
+        b.eq    3f
+        add     x3, x3, #CPU_INFO_SZ
+        b       1b
+2:
+        mov     x3, #0                          // unknown processor
+3:
+        mov     x0, x3
+        ret
+ENDPROC(lookup_processor_type)
+
+        .align  3
+        .type   __lookup_processor_type_data, %object
+__lookup_processor_type_data:
+        .quad   .
+        .quad   cpu_table
+        .size   __lookup_processor_type_data, . - __lookup_processor_type_data
+
+/*
+ * Determine validity of the x21 FDT pointer.
+ * The dtb must be 8-byte aligned and live in the first 512M of memory.
+ */
+__vet_fdt:
+        tst     x21, #0x7
+        b.ne    1f
+        cmp     x21, x24
+        b.lt    1f
+        mov     x0, #(1 << 29)
+        add     x0, x0, x24
+        cmp     x21, x0
+        b.ge    1f
+        ret
+1:
+        mov     x21, #0
+        ret
+ENDPROC(__vet_fdt)
diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c
new file mode 100644
index 00000000000..5ab825c59db
--- /dev/null
+++ b/arch/arm64/kernel/hw_breakpoint.c
@@ -0,0 +1,880 @@
+/*
+ * HW_breakpoint: a unified kernel/user-space hardware breakpoint facility,
+ * using the CPU's debug registers.
+ *
+ * Copyright (C) 2012 ARM Limited
+ * Author: Will Deacon <will.deacon@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define pr_fmt(fmt) "hw-breakpoint: " fmt
+
+#include <linux/errno.h>
+#include <linux/hw_breakpoint.h>
+#include <linux/perf_event.h>
+#include <linux/ptrace.h>
+#include <linux/smp.h>
+
+#include <asm/compat.h>
+#include <asm/current.h>
+#include <asm/debug-monitors.h>
+#include <asm/hw_breakpoint.h>
+#include <asm/kdebug.h>
+#include <asm/traps.h>
+#include <asm/cputype.h>
+#include <asm/system_misc.h>
+
+/* Breakpoint currently in use for each BRP. */
+static DEFINE_PER_CPU(struct perf_event *, bp_on_reg[ARM_MAX_BRP]);
+
+/* Watchpoint currently in use for each WRP. */
+static DEFINE_PER_CPU(struct perf_event *, wp_on_reg[ARM_MAX_WRP]);
+
+/* Currently stepping a per-CPU kernel breakpoint. */
+static DEFINE_PER_CPU(int, stepping_kernel_bp);
+
+/* Number of BRP/WRP registers on this CPU. */
+static int core_num_brps;
+static int core_num_wrps;
+
+/* Determine number of BRP registers available. */
+static int get_num_brps(void)
+{
+        return ((read_cpuid(ID_AA64DFR0_EL1) >> 12) & 0xf) + 1;
+}
+
+/* Determine number of WRP registers available. */
+static int get_num_wrps(void)
+{
+        return ((read_cpuid(ID_AA64DFR0_EL1) >> 20) & 0xf) + 1;
+}
+
+int hw_breakpoint_slots(int type)
+{
+        /*
+         * We can be called early, so don't rely on
+         * our static variables being initialised.
+         */
+        switch (type) {
+        case TYPE_INST:
+                return get_num_brps();
+        case TYPE_DATA:
+                return get_num_wrps();
+        default:
+                pr_warning("unknown slot type: %d\n", type);
+                return 0;
+        }
+}
+
+#define READ_WB_REG_CASE(OFF, N, REG, VAL)      \
+        case (OFF + N):                         \
+                AARCH64_DBG_READ(N, REG, VAL);  \
+                break
+
+#define WRITE_WB_REG_CASE(OFF, N, REG, VAL)     \
+        case (OFF + N):                         \
+                AARCH64_DBG_WRITE(N, REG, VAL); \
+                break
+
+#define GEN_READ_WB_REG_CASES(OFF, REG, VAL)    \
+        READ_WB_REG_CASE(OFF,  0, REG, VAL);    \
+        READ_WB_REG_CASE(OFF,  1, REG, VAL);    \
+        READ_WB_REG_CASE(OFF,  2, REG, VAL);    \
+        READ_WB_REG_CASE(OFF,  3, REG, VAL);    \
+        READ_WB_REG_CASE(OFF,  4, REG, VAL);    \
+        READ_WB_REG_CASE(OFF,  5, REG, VAL);    \
+        READ_WB_REG_CASE(OFF,  6, REG, VAL);    \
+        READ_WB_REG_CASE(OFF,  7, REG, VAL);    \
+        READ_WB_REG_CASE(OFF,  8, REG, VAL);    \
+        READ_WB_REG_CASE(OFF,  9, REG, VAL);    \
+        READ_WB_REG_CASE(OFF, 10, REG, VAL);    \
+        READ_WB_REG_CASE(OFF, 11, REG, VAL);    \
+        READ_WB_REG_CASE(OFF, 12, REG, VAL);    \
+        READ_WB_REG_CASE(OFF, 13, REG, VAL);    \
+        READ_WB_REG_CASE(OFF, 14, REG, VAL);    \
+        READ_WB_REG_CASE(OFF, 15, REG, VAL)
+
+#define GEN_WRITE_WB_REG_CASES(OFF, REG, VAL)   \
+        WRITE_WB_REG_CASE(OFF,  0, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF,  1, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF,  2, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF,  3, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF,  4, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF,  5, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF,  6, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF,  7, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF,  8, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF,  9, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF, 10, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF, 11, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF, 12, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF, 13, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF, 14, REG, VAL);   \
+        WRITE_WB_REG_CASE(OFF, 15, REG, VAL)
+
+static u64 read_wb_reg(int reg, int n)
+{
+        u64 val = 0;
+
+        switch (reg + n) {
+        GEN_READ_WB_REG_CASES(AARCH64_DBG_REG_BVR, AARCH64_DBG_REG_NAME_BVR, val);
+        GEN_READ_WB_REG_CASES(AARCH64_DBG_REG_BCR, AARCH64_DBG_REG_NAME_BCR, val);
+        GEN_READ_WB_REG_CASES(AARCH64_DBG_REG_WVR, AARCH64_DBG_REG_NAME_WVR, val);
+        GEN_READ_WB_REG_CASES(AARCH64_DBG_REG_WCR, AARCH64_DBG_REG_NAME_WCR, val);
+        default:
+                pr_warning("attempt to read from unknown breakpoint register %d\n", n);
+        }
+
+        return val;
+}
+
+static void write_wb_reg(int reg, int n, u64 val)
+{
+        switch (reg + n) {
+        GEN_WRITE_WB_REG_CASES(AARCH64_DBG_REG_BVR, AARCH64_DBG_REG_NAME_BVR, val);
+        GEN_WRITE_WB_REG_CASES(AARCH64_DBG_REG_BCR, AARCH64_DBG_REG_NAME_BCR, val);
+        GEN_WRITE_WB_REG_CASES(AARCH64_DBG_REG_WVR, AARCH64_DBG_REG_NAME_WVR, val);
+        GEN_WRITE_WB_REG_CASES(AARCH64_DBG_REG_WCR, AARCH64_DBG_REG_NAME_WCR, val);
+        default:
+                pr_warning("attempt to write to unknown breakpoint register %d\n", n);
+        }
+        isb();
+}
+
+/*
+ * Convert a breakpoint privilege level to the corresponding exception
+ * level.
+ */
+static enum debug_el debug_exception_level(int privilege)
+{
+        switch (privilege) {
+        case AARCH64_BREAKPOINT_EL0:
+                return DBG_ACTIVE_EL0;
+        case AARCH64_BREAKPOINT_EL1:
+                return DBG_ACTIVE_EL1;
+        default:
+                pr_warning("invalid breakpoint privilege level %d\n", privilege);
+                return -EINVAL;
+        }
+}
+
+/*
+ * Install a perf counter breakpoint.
+ */
+int arch_install_hw_breakpoint(struct perf_event *bp)
+{
+        struct arch_hw_breakpoint *info = counter_arch_bp(bp);
+        struct perf_event **slot, **slots;
+        struct debug_info *debug_info = &current->thread.debug;
+        int i, max_slots, ctrl_reg, val_reg, reg_enable;
+        u32 ctrl;
+
+        if (info->ctrl.type == ARM_BREAKPOINT_EXECUTE) {
+                /* Breakpoint */
+                ctrl_reg = AARCH64_DBG_REG_BCR;
+                val_reg = AARCH64_DBG_REG_BVR;
+                slots = __get_cpu_var(bp_on_reg);
+                max_slots = core_num_brps;
+                reg_enable = !debug_info->bps_disabled;
+        } else {
+                /* Watchpoint */
+                ctrl_reg = AARCH64_DBG_REG_WCR;
+                val_reg = AARCH64_DBG_REG_WVR;
+                slots = __get_cpu_var(wp_on_reg);
+                max_slots = core_num_wrps;
+                reg_enable = !debug_info->wps_disabled;
+        }
+
+        for (i = 0; i < max_slots; ++i) {
+                slot = &slots[i];
+
+                if (!*slot) {
+                        *slot = bp;
+                        break;
+                }
+        }
+
+        if (WARN_ONCE(i == max_slots, "Can't find any breakpoint slot"))
+                return -ENOSPC;
+
+        /* Ensure debug monitors are enabled at the correct exception level.  */
+        enable_debug_monitors(debug_exception_level(info->ctrl.privilege));
+
+        /* Setup the address register. */
+        write_wb_reg(val_reg, i, info->address);
+
+        /* Setup the control register. */
+        ctrl = encode_ctrl_reg(info->ctrl);
+        write_wb_reg(ctrl_reg, i, reg_enable ? ctrl | 0x1 : ctrl & ~0x1);
+
+        return 0;
+}
+
+void arch_uninstall_hw_breakpoint(struct perf_event *bp)
+{
+        struct arch_hw_breakpoint *info = counter_arch_bp(bp);
+        struct perf_event **slot, **slots;
+        int i, max_slots, base;
+
+        if (info->ctrl.type == ARM_BREAKPOINT_EXECUTE) {
+                /* Breakpoint */
+                base = AARCH64_DBG_REG_BCR;
+                slots = __get_cpu_var(bp_on_reg);
+                max_slots = core_num_brps;
+        } else {
+                /* Watchpoint */
+                base = AARCH64_DBG_REG_WCR;
+                slots = __get_cpu_var(wp_on_reg);
+                max_slots = core_num_wrps;
+        }
+
+        /* Remove the breakpoint. */
+        for (i = 0; i < max_slots; ++i) {
+                slot = &slots[i];
+
+                if (*slot == bp) {
+                        *slot = NULL;
+                        break;
+                }
+        }
+
+        if (WARN_ONCE(i == max_slots, "Can't find any breakpoint slot"))
+                return;
+
+        /* Reset the control register. */
+        write_wb_reg(base, i, 0);
+
+        /* Release the debug monitors for the correct exception level.  */
+        disable_debug_monitors(debug_exception_level(info->ctrl.privilege));
+}
+
+static int get_hbp_len(u8 hbp_len)
+{
+        unsigned int len_in_bytes = 0;
+
+        switch (hbp_len) {
+        case ARM_BREAKPOINT_LEN_1:
+                len_in_bytes = 1;
+                break;
+        case ARM_BREAKPOINT_LEN_2:
+                len_in_bytes = 2;
+                break;
+        case ARM_BREAKPOINT_LEN_4:
+                len_in_bytes = 4;
+                break;
+        case ARM_BREAKPOINT_LEN_8:
+                len_in_bytes = 8;
+                break;
+        }
+
+        return len_in_bytes;
+}
+
+/*
+ * Check whether bp virtual address is in kernel space.
+ */
+int arch_check_bp_in_kernelspace(struct perf_event *bp)
+{
+        unsigned int len;
+        unsigned long va;
+        struct arch_hw_breakpoint *info = counter_arch_bp(bp);
+
+        va = info->address;
+        len = get_hbp_len(info->ctrl.len);
+
+        return (va >= TASK_SIZE) && ((va + len - 1) >= TASK_SIZE);
+}
+
+/*
+ * Extract generic type and length encodings from an arch_hw_breakpoint_ctrl.
+ * Hopefully this will disappear when ptrace can bypass the conversion
+ * to generic breakpoint descriptions.
+ */
+int arch_bp_generic_fields(struct arch_hw_breakpoint_ctrl ctrl,
+                           int *gen_len, int *gen_type)
+{
+        /* Type */
+        switch (ctrl.type) {
+        case ARM_BREAKPOINT_EXECUTE:
+                *gen_type = HW_BREAKPOINT_X;
+                break;
+        case ARM_BREAKPOINT_LOAD:
+                *gen_type = HW_BREAKPOINT_R;
+                break;
+        case ARM_BREAKPOINT_STORE:
+                *gen_type = HW_BREAKPOINT_W;
+                break;
+        case ARM_BREAKPOINT_LOAD | ARM_BREAKPOINT_STORE:
+                *gen_type = HW_BREAKPOINT_RW;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        /* Len */
+        switch (ctrl.len) {
+        case ARM_BREAKPOINT_LEN_1:
+                *gen_len = HW_BREAKPOINT_LEN_1;
+                break;
+        case ARM_BREAKPOINT_LEN_2:
+                *gen_len = HW_BREAKPOINT_LEN_2;
+                break;
+        case ARM_BREAKPOINT_LEN_4:
+                *gen_len = HW_BREAKPOINT_LEN_4;
+                break;
+        case ARM_BREAKPOINT_LEN_8:
+                *gen_len = HW_BREAKPOINT_LEN_8;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+/*
+ * Construct an arch_hw_breakpoint from a perf_event.
+ */
+static int arch_build_bp_info(struct perf_event *bp)
+{
+        struct arch_hw_breakpoint *info = counter_arch_bp(bp);
+
+        /* Type */
+        switch (bp->attr.bp_type) {
+        case HW_BREAKPOINT_X:
+                info->ctrl.type = ARM_BREAKPOINT_EXECUTE;
+                break;
+        case HW_BREAKPOINT_R:
+                info->ctrl.type = ARM_BREAKPOINT_LOAD;
+                break;
+        case HW_BREAKPOINT_W:
+                info->ctrl.type = ARM_BREAKPOINT_STORE;
+                break;
+        case HW_BREAKPOINT_RW:
+                info->ctrl.type = ARM_BREAKPOINT_LOAD | ARM_BREAKPOINT_STORE;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        /* Len */
+        switch (bp->attr.bp_len) {
+        case HW_BREAKPOINT_LEN_1:
+                info->ctrl.len = ARM_BREAKPOINT_LEN_1;
+                break;
+        case HW_BREAKPOINT_LEN_2:
+                info->ctrl.len = ARM_BREAKPOINT_LEN_2;
+                break;
+        case HW_BREAKPOINT_LEN_4:
+                info->ctrl.len = ARM_BREAKPOINT_LEN_4;
+                break;
+        case HW_BREAKPOINT_LEN_8:
+                info->ctrl.len = ARM_BREAKPOINT_LEN_8;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        /*
+         * On AArch64, we only permit breakpoints of length 4, whereas
+         * AArch32 also requires breakpoints of length 2 for Thumb.
+         * Watchpoints can be of length 1, 2, 4 or 8 bytes.
+         */
+        if (info->ctrl.type == ARM_BREAKPOINT_EXECUTE) {
+                if (is_compat_task()) {
+                        if (info->ctrl.len != ARM_BREAKPOINT_LEN_2 &&
+                            info->ctrl.len != ARM_BREAKPOINT_LEN_4)
+                                return -EINVAL;
+                } else if (info->ctrl.len != ARM_BREAKPOINT_LEN_4) {
+                        /*
+                         * FIXME: Some tools (I'm looking at you perf) assume
+                         *        that breakpoints should be sizeof(long). This
+                         *        is nonsense. For now, we fix up the parameter
+                         *        but we should probably return -EINVAL instead.
+                         */
+                        info->ctrl.len = ARM_BREAKPOINT_LEN_4;
+                }
+        }
+
+        /* Address */
+        info->address = bp->attr.bp_addr;
+
+        /*
+         * Privilege
+         * Note that we disallow combined EL0/EL1 breakpoints because
+         * that would complicate the stepping code.
+         */
+        if (arch_check_bp_in_kernelspace(bp))
+                info->ctrl.privilege = AARCH64_BREAKPOINT_EL1;
+        else
+                info->ctrl.privilege = AARCH64_BREAKPOINT_EL0;
+
+        /* Enabled? */
+        info->ctrl.enabled = !bp->attr.disabled;
+
+        return 0;
+}
+
+/*
+ * Validate the arch-specific HW Breakpoint register settings.
+ */
+int arch_validate_hwbkpt_settings(struct perf_event *bp)
+{
+        struct arch_hw_breakpoint *info = counter_arch_bp(bp);
+        int ret;
+        u64 alignment_mask, offset;
+
+        /* Build the arch_hw_breakpoint. */
+        ret = arch_build_bp_info(bp);
+        if (ret)
+                return ret;
+
+        /*
+         * Check address alignment.
+         * We don't do any clever alignment correction for watchpoints
+         * because using 64-bit unaligned addresses is deprecated for
+         * AArch64.
+         *
+         * AArch32 tasks expect some simple alignment fixups, so emulate
+         * that here.
+         */
+        if (is_compat_task()) {
+                if (info->ctrl.len == ARM_BREAKPOINT_LEN_8)
+                        alignment_mask = 0x7;
+                else
+                        alignment_mask = 0x3;
+                offset = info->address & alignment_mask;
+                switch (offset) {
+                case 0:
+                        /* Aligned */
+                        break;
+                case 1:
+                        /* Allow single byte watchpoint. */
+                        if (info->ctrl.len == ARM_BREAKPOINT_LEN_1)
+                                break;
+                case 2:
+                        /* Allow halfword watchpoints and breakpoints. */
+                        if (info->ctrl.len == ARM_BREAKPOINT_LEN_2)
+                                break;
+                default:
+                        return -EINVAL;
+                }
+
+                info->address &= ~alignment_mask;
+                info->ctrl.len <<= offset;
+        } else {
+                if (info->ctrl.type == ARM_BREAKPOINT_EXECUTE)
+                        alignment_mask = 0x3;
+                else
+                        alignment_mask = 0x7;
+                if (info->address & alignment_mask)
+                        return -EINVAL;
+        }
+
+        /*
+         * Disallow per-task kernel breakpoints since these would
+         * complicate the stepping code.
+         */
+        if (info->ctrl.privilege == AARCH64_BREAKPOINT_EL1 && bp->hw.bp_target)
+                return -EINVAL;
+
+        return 0;
+}
+
+/*
+ * Enable/disable all of the breakpoints active at the specified
+ * exception level at the register level.
+ * This is used when single-stepping after a breakpoint exception.
+ */
+static void toggle_bp_registers(int reg, enum debug_el el, int enable)
+{
+        int i, max_slots, privilege;
+        u32 ctrl;
+        struct perf_event **slots;
+
+        switch (reg) {
+        case AARCH64_DBG_REG_BCR:
+                slots = __get_cpu_var(bp_on_reg);
+                max_slots = core_num_brps;
+                break;
+        case AARCH64_DBG_REG_WCR:
+                slots = __get_cpu_var(wp_on_reg);
+                max_slots = core_num_wrps;
+                break;
+        default:
+                return;
+        }
+
+        for (i = 0; i < max_slots; ++i) {
+                if (!slots[i])
+                        continue;
+
+                privilege = counter_arch_bp(slots[i])->ctrl.privilege;
+                if (debug_exception_level(privilege) != el)
+                        continue;
+
+                ctrl = read_wb_reg(reg, i);
+                if (enable)
+                        ctrl |= 0x1;
+                else
+                        ctrl &= ~0x1;
+                write_wb_reg(reg, i, ctrl);
+        }
+}
+
+/*
+ * Debug exception handlers.
+ */
+static int breakpoint_handler(unsigned long unused, unsigned int esr,
+                              struct pt_regs *regs)
+{
+        int i, step = 0, *kernel_step;
+        u32 ctrl_reg;
+        u64 addr, val;
+        struct perf_event *bp, **slots;
+        struct debug_info *debug_info;
+        struct arch_hw_breakpoint_ctrl ctrl;
+
+        slots = (struct perf_event **)__get_cpu_var(bp_on_reg);
+        addr = instruction_pointer(regs);
+        debug_info = &current->thread.debug;
+
+        for (i = 0; i < core_num_brps; ++i) {
+                rcu_read_lock();
+
+                bp = slots[i];
+
+                if (bp == NULL)
+                        goto unlock;
+
+                /* Check if the breakpoint value matches. */
+                val = read_wb_reg(AARCH64_DBG_REG_BVR, i);
+                if (val != (addr & ~0x3))
+                        goto unlock;
+
+                /* Possible match, check the byte address select to confirm. */
+                ctrl_reg = read_wb_reg(AARCH64_DBG_REG_BCR, i);
+                decode_ctrl_reg(ctrl_reg, &ctrl);
+                if (!((1 << (addr & 0x3)) & ctrl.len))
+                        goto unlock;
+
+                counter_arch_bp(bp)->trigger = addr;
+                perf_bp_event(bp, regs);
+
+                /* Do we need to handle the stepping? */
+                if (!bp->overflow_handler)
+                        step = 1;
+unlock:
+                rcu_read_unlock();
+        }
+
+        if (!step)
+                return 0;
+
+        if (user_mode(regs)) {
+                debug_info->bps_disabled = 1;
+                toggle_bp_registers(AARCH64_DBG_REG_BCR, DBG_ACTIVE_EL0, 0);
+
+                /* If we're already stepping a watchpoint, just return. */
+                if (debug_info->wps_disabled)
+                        return 0;
+
+                if (test_thread_flag(TIF_SINGLESTEP))
+                        debug_info->suspended_step = 1;
+                else
+                        user_enable_single_step(current);
+        } else {
+                toggle_bp_registers(AARCH64_DBG_REG_BCR, DBG_ACTIVE_EL1, 0);
+                kernel_step = &__get_cpu_var(stepping_kernel_bp);
+
+                if (*kernel_step != ARM_KERNEL_STEP_NONE)
+                        return 0;
+
+                if (kernel_active_single_step()) {
+                        *kernel_step = ARM_KERNEL_STEP_SUSPEND;
+                } else {
+                        *kernel_step = ARM_KERNEL_STEP_ACTIVE;
+                        kernel_enable_single_step(regs);
+                }
+        }
+
+        return 0;
+}
+
+static int watchpoint_handler(unsigned long addr, unsigned int esr,
+                              struct pt_regs *regs)
+{
+        int i, step = 0, *kernel_step, access;
+        u32 ctrl_reg;
+        u64 val, alignment_mask;
+        struct perf_event *wp, **slots;
+        struct debug_info *debug_info;
+        struct arch_hw_breakpoint *info;
+        struct arch_hw_breakpoint_ctrl ctrl;
+
+        slots = (struct perf_event **)__get_cpu_var(wp_on_reg);
+        debug_info = &current->thread.debug;
+
+        for (i = 0; i < core_num_wrps; ++i) {
+                rcu_read_lock();
+
+                wp = slots[i];
+
+                if (wp == NULL)
+                        goto unlock;
+
+                info = counter_arch_bp(wp);
+                /* AArch32 watchpoints are either 4 or 8 bytes aligned. */
+                if (is_compat_task()) {
+                        if (info->ctrl.len == ARM_BREAKPOINT_LEN_8)
+                                alignment_mask = 0x7;
+                        else
+                                alignment_mask = 0x3;
+                } else {
+                        alignment_mask = 0x7;
+                }
+
+                /* Check if the watchpoint value matches. */
+                val = read_wb_reg(AARCH64_DBG_REG_WVR, i);
+                if (val != (addr & ~alignment_mask))
+                        goto unlock;
+
+                /* Possible match, check the byte address select to confirm. */
+                ctrl_reg = read_wb_reg(AARCH64_DBG_REG_WCR, i);
+                decode_ctrl_reg(ctrl_reg, &ctrl);
+                if (!((1 << (addr & alignment_mask)) & ctrl.len))
+                        goto unlock;
+
+                /*
+                 * Check that the access type matches.
+                 * 0 => load, otherwise => store
+                 */
+                access = (esr & AARCH64_ESR_ACCESS_MASK) ? HW_BREAKPOINT_W :
+                         HW_BREAKPOINT_R;
+                if (!(access & hw_breakpoint_type(wp)))
+                        goto unlock;
+
+                info->trigger = addr;
+                perf_bp_event(wp, regs);
+
+                /* Do we need to handle the stepping? */
+                if (!wp->overflow_handler)
+                        step = 1;
+
+unlock:
+                rcu_read_unlock();
+        }
+
+        if (!step)
+                return 0;
+
+        /*
+         * We always disable EL0 watchpoints because the kernel can
+         * cause these to fire via an unprivileged access.
+         */
+        toggle_bp_registers(AARCH64_DBG_REG_WCR, DBG_ACTIVE_EL0, 0);
+
+        if (user_mode(regs)) {
+                debug_info->wps_disabled = 1;
+
+                /* If we're already stepping a breakpoint, just return. */
+                if (debug_info->bps_disabled)
+                        return 0;
+
+                if (test_thread_flag(TIF_SINGLESTEP))
+                        debug_info->suspended_step = 1;
+                else
+                        user_enable_single_step(current);
+        } else {
+                toggle_bp_registers(AARCH64_DBG_REG_WCR, DBG_ACTIVE_EL1, 0);
+                kernel_step = &__get_cpu_var(stepping_kernel_bp);
+
+                if (*kernel_step != ARM_KERNEL_STEP_NONE)
+                        return 0;
+
+                if (kernel_active_single_step()) {
+                        *kernel_step = ARM_KERNEL_STEP_SUSPEND;
+                } else {
+                        *kernel_step = ARM_KERNEL_STEP_ACTIVE;
+                        kernel_enable_single_step(regs);
+                }
+        }
+
+        return 0;
+}
+
+/*
+ * Handle single-step exception.
+ */
+int reinstall_suspended_bps(struct pt_regs *regs)
+{
+        struct debug_info *debug_info = &current->thread.debug;
+        int handled_exception = 0, *kernel_step;
+
+        kernel_step = &__get_cpu_var(stepping_kernel_bp);
+
+        /*
+         * Called from single-step exception handler.
+         * Return 0 if execution can resume, 1 if a SIGTRAP should be
+         * reported.
+         */
+        if (user_mode(regs)) {
+                if (debug_info->bps_disabled) {
+                        debug_info->bps_disabled = 0;
+                        toggle_bp_registers(AARCH64_DBG_REG_BCR, DBG_ACTIVE_EL0, 1);
+                        handled_exception = 1;
+                }
+
+                if (debug_info->wps_disabled) {
+                        debug_info->wps_disabled = 0;
+                        toggle_bp_registers(AARCH64_DBG_REG_WCR, DBG_ACTIVE_EL0, 1);
+                        handled_exception = 1;
+                }
+
+                if (handled_exception) {
+                        if (debug_info->suspended_step) {
+                                debug_info->suspended_step = 0;
+                                /* Allow exception handling to fall-through. */
+                                handled_exception = 0;
+                        } else {
+                                user_disable_single_step(current);
+                        }
+                }
+        } else if (*kernel_step != ARM_KERNEL_STEP_NONE) {
+                toggle_bp_registers(AARCH64_DBG_REG_BCR, DBG_ACTIVE_EL1, 1);
+                toggle_bp_registers(AARCH64_DBG_REG_WCR, DBG_ACTIVE_EL1, 1);
+
+                if (!debug_info->wps_disabled)
+                        toggle_bp_registers(AARCH64_DBG_REG_WCR, DBG_ACTIVE_EL0, 1);
+
+                if (*kernel_step != ARM_KERNEL_STEP_SUSPEND) {
+                        kernel_disable_single_step();
+                        handled_exception = 1;
+                } else {
+                        handled_exception = 0;
+                }
+
+                *kernel_step = ARM_KERNEL_STEP_NONE;
+        }
+
+        return !handled_exception;
+}
+
+/*
+ * Context-switcher for restoring suspended breakpoints.
+ */
+void hw_breakpoint_thread_switch(struct task_struct *next)
+{
+        /*
+         *           current        next
+         * disabled: 0              0     => The usual case, NOTIFY_DONE
+         *           0              1     => Disable the registers
+         *           1              0     => Enable the registers
+         *           1              1     => NOTIFY_DONE. per-task bps will
+         *                                   get taken care of by perf.
+         */
+
+        struct debug_info *current_debug_info, *next_debug_info;
+
+        current_debug_info = &current->thread.debug;
+        next_debug_info = &next->thread.debug;
+
+        /* Update breakpoints. */
+        if (current_debug_info->bps_disabled != next_debug_info->bps_disabled)
+                toggle_bp_registers(AARCH64_DBG_REG_BCR,
+                                    DBG_ACTIVE_EL0,
+                                    !next_debug_info->bps_disabled);
+
+        /* Update watchpoints. */
+        if (current_debug_info->wps_disabled != next_debug_info->wps_disabled)
+                toggle_bp_registers(AARCH64_DBG_REG_WCR,
+                                    DBG_ACTIVE_EL0,
+                                    !next_debug_info->wps_disabled);
+}
+
+/*
+ * CPU initialisation.
+ */
+static void reset_ctrl_regs(void *unused)
+{
+        int i;
+
+        for (i = 0; i < core_num_brps; ++i) {
+                write_wb_reg(AARCH64_DBG_REG_BCR, i, 0UL);
+                write_wb_reg(AARCH64_DBG_REG_BVR, i, 0UL);
+        }
+
+        for (i = 0; i < core_num_wrps; ++i) {
+                write_wb_reg(AARCH64_DBG_REG_WCR, i, 0UL);
+                write_wb_reg(AARCH64_DBG_REG_WVR, i, 0UL);
+        }
+}
+
+static int __cpuinit hw_breakpoint_reset_notify(struct notifier_block *self,
+                                                unsigned long action,
+                                                void *hcpu)
+{
+        int cpu = (long)hcpu;
+        if (action == CPU_ONLINE)
+                smp_call_function_single(cpu, reset_ctrl_regs, NULL, 1);
+        return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata hw_breakpoint_reset_nb = {
+        .notifier_call = hw_breakpoint_reset_notify,
+};
+
+/*
+ * One-time initialisation.
+ */
+static int __init arch_hw_breakpoint_init(void)
+{
+        core_num_brps = get_num_brps();
+        core_num_wrps = get_num_wrps();
+
+        pr_info("found %d breakpoint and %d watchpoint registers.\n",
+                core_num_brps, core_num_wrps);
+
+        /*
+         * Reset the breakpoint resources. We assume that a halting
+         * debugger will leave the world in a nice state for us.
+         */
+        smp_call_function(reset_ctrl_regs, NULL, 1);
+        reset_ctrl_regs(NULL);
+
+        /* Register debug fault handlers. */
+        hook_debug_fault_code(DBG_ESR_EVT_HWBP, breakpoint_handler, SIGTRAP,
+                              TRAP_HWBKPT, "hw-breakpoint handler");
+        hook_debug_fault_code(DBG_ESR_EVT_HWWP, watchpoint_handler, SIGTRAP,
+                              TRAP_HWBKPT, "hw-watchpoint handler");
+
+        /* Register hotplug notifier. */
+        register_cpu_notifier(&hw_breakpoint_reset_nb);
+
+        return 0;
+}
+arch_initcall(arch_hw_breakpoint_init);
+
+void hw_breakpoint_pmu_read(struct perf_event *bp)
+{
+}
+
+/*
+ * Dummy function to register with die_notifier.
+ */
+int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
+                                    unsigned long val, void *data)
+{
+        return NOTIFY_DONE;
+}
diff --git a/arch/arm64/kernel/io.c b/arch/arm64/kernel/io.c
new file mode 100644
index 00000000000..7d37ead4d19
--- /dev/null
+++ b/arch/arm64/kernel/io.c
@@ -0,0 +1,64 @@
+/*
+ * Based on arch/arm/kernel/io.c
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/export.h>
+#include <linux/types.h>
+#include <linux/io.h>
+
+/*
+ * Copy data from IO memory space to "real" memory space.
+ */
+void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
+{
+        unsigned char *t = to;
+        while (count) {
+                count--;
+                *t = readb(from);
+                t++;
+                from++;
+        }
+}
+EXPORT_SYMBOL(__memcpy_fromio);
+
+/*
+ * Copy data from "real" memory space to IO memory space.
+ */
+void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
+{
+        const unsigned char *f = from;
+        while (count) {
+                count--;
+                writeb(*f, to);
+                f++;
+                to++;
+        }
+}
+EXPORT_SYMBOL(__memcpy_toio);
+
+/*
+ * "memset" on IO memory space.
+ */
+void __memset_io(volatile void __iomem *dst, int c, size_t count)
+{
+        while (count) {
+                count--;
+                writeb(c, dst);
+                dst++;
+        }
+}
+EXPORT_SYMBOL(__memset_io);
diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
new file mode 100644
index 00000000000..0373c6609ea
--- /dev/null
+++ b/arch/arm64/kernel/irq.c
@@ -0,0 +1,84 @@
+/*
+ * Based on arch/arm/kernel/irq.c
+ *
+ * Copyright (C) 1992 Linus Torvalds
+ * Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
+ * Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation.
+ * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and
+ * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel_stat.h>
+#include <linux/irq.h>
+#include <linux/smp.h>
+#include <linux/init.h>
+#include <linux/of_irq.h>
+#include <linux/seq_file.h>
+#include <linux/ratelimit.h>
+
+unsigned long irq_err_count;
+
+int arch_show_interrupts(struct seq_file *p, int prec)
+{
+#ifdef CONFIG_SMP
+        show_ipi_list(p, prec);
+#endif
+        seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
+        return 0;
+}
+
+/*
+ * handle_IRQ handles all hardware IRQ's.  Decoded IRQs should
+ * not come via this function.  Instead, they should provide their
+ * own 'handler'.  Used by platform code implementing C-based 1st
+ * level decoding.
+ */
+void handle_IRQ(unsigned int irq, struct pt_regs *regs)
+{
+        struct pt_regs *old_regs = set_irq_regs(regs);
+
+        irq_enter();
+
+        /*
+         * Some hardware gives randomly wrong interrupts.  Rather
+         * than crashing, do something sensible.
+         */
+        if (unlikely(irq >= nr_irqs)) {
+                pr_warn_ratelimited("Bad IRQ%u\n", irq);
+                ack_bad_irq(irq);
+        } else {
+                generic_handle_irq(irq);
+        }
+
+        irq_exit();
+        set_irq_regs(old_regs);
+}
+
+/*
+ * Interrupt controllers supported by the kernel.
+ */
+static const struct of_device_id intctrl_of_match[] __initconst = {
+        /* IRQ controllers { .compatible, .data } info to go here */
+        {}
+};
+
+void __init init_IRQ(void)
+{
+        of_irq_init(intctrl_of_match);
+
+        if (!handle_arch_irq)
+                panic("No interrupt controller found.");
+}
diff --git a/arch/arm64/kernel/kuser32.S b/arch/arm64/kernel/kuser32.S
new file mode 100644
index 00000000000..8b69ecb1d8b
--- /dev/null
+++ b/arch/arm64/kernel/kuser32.S
@@ -0,0 +1,77 @@
+/*
+ * Low-level user helpers placed in the vectors page for AArch32.
+ * Based on the kuser helpers in arch/arm/kernel/entry-armv.S.
+ *
+ * Copyright (C) 2005-2011 Nicolas Pitre <nico@fluxnic.net>
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * AArch32 user helpers.
+ *
+ * Each segment is 32-byte aligned and will be moved to the top of the high
+ * vector page.  New segments (if ever needed) must be added in front of
+ * existing ones.  This mechanism should be used only for things that are
+ * really small and justified, and not be abused freely.
+ *
+ * See Documentation/arm/kernel_user_helpers.txt for formal definitions.
+ */
+        .align  5
+        .globl  __kuser_helper_start
+__kuser_helper_start:
+
+__kuser_cmpxchg64:                      // 0xffff0f60
+        .inst   0xe92d00f0              //      push            {r4, r5, r6, r7}
+        .inst   0xe1c040d0              //      ldrd            r4, r5, [r0]
+        .inst   0xe1c160d0              //      ldrd            r6, r7, [r1]
+        .inst   0xf57ff05f              //      dmb             sy
+        .inst   0xe1b20f9f              // 1:   ldrexd          r0, r1, [r2]
+        .inst   0xe0303004              //      eors            r3, r0, r4
+        .inst   0x00313005              //      eoreqs          r3, r1, r5
+        .inst   0x01a23f96              //      strexdeq        r3, r6, [r2]
+        .inst   0x03330001              //      teqeq           r3, #1
+        .inst   0x0afffff9              //      beq             1b
+        .inst   0xf57ff05f              //      dmb             sy
+        .inst   0xe2730000              //      rsbs            r0, r3, #0
+        .inst   0xe8bd00f0              //      pop             {r4, r5, r6, r7}
+        .inst   0xe12fff1e              //      bx              lr
+
+        .align  5
+__kuser_memory_barrier:                 // 0xffff0fa0
+        .inst   0xf57ff05f              //      dmb             sy
+        .inst   0xe12fff1e              //      bx              lr
+
+        .align  5
+__kuser_cmpxchg:                        // 0xffff0fc0
+        .inst   0xf57ff05f              //      dmb             sy
+        .inst   0xe1923f9f              // 1:   ldrex           r3, [r2]
+        .inst   0xe0533000              //      subs            r3, r3, r0
+        .inst   0x01823f91              //      strexeq r3, r1, [r2]
+        .inst   0x03330001              //      teqeq           r3, #1
+        .inst   0x0afffffa              //      beq             1b
+        .inst   0xe2730000              //      rsbs            r0, r3, #0
+        .inst   0xeaffffef              //      b               <__kuser_memory_barrier>
+
+        .align  5
+__kuser_get_tls:                        // 0xffff0fe0
+        .inst   0xee1d0f70              //      mrc             p15, 0, r0, c13, c0, 3
+        .inst   0xe12fff1e              //      bx              lr
+        .rep    5
+        .word   0
+        .endr
+
+__kuser_helper_version:                 // 0xffff0ffc
+        .word   ((__kuser_helper_end - __kuser_helper_start) >> 5)
+        .globl  __kuser_helper_end
+__kuser_helper_end:
diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c
new file mode 100644
index 00000000000..ca0e3d55da9
--- /dev/null
+++ b/arch/arm64/kernel/module.c
@@ -0,0 +1,456 @@
+/*
+ * AArch64 loadable module support.
+ *
+ * Copyright (C) 2012 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/elf.h>
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/moduleloader.h>
+#include <linux/vmalloc.h>
+
+void *module_alloc(unsigned long size)
+{
+        return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
+                                    GFP_KERNEL, PAGE_KERNEL_EXEC, -1,
+                                    __builtin_return_address(0));
+}
+
+enum aarch64_reloc_op {
+        RELOC_OP_NONE,
+        RELOC_OP_ABS,
+        RELOC_OP_PREL,
+        RELOC_OP_PAGE,
+};
+
+static u64 do_reloc(enum aarch64_reloc_op reloc_op, void *place, u64 val)
+{
+        switch (reloc_op) {
+        case RELOC_OP_ABS:
+                return val;
+        case RELOC_OP_PREL:
+                return val - (u64)place;
+        case RELOC_OP_PAGE:
+                return (val & ~0xfff) - ((u64)place & ~0xfff);
+        case RELOC_OP_NONE:
+                return 0;
+        }
+
+        pr_err("do_reloc: unknown relocation operation %d\n", reloc_op);
+        return 0;
+}
+
+static int reloc_data(enum aarch64_reloc_op op, void *place, u64 val, int len)
+{
+        u64 imm_mask = (1 << len) - 1;
+        s64 sval = do_reloc(op, place, val);
+
+        switch (len) {
+        case 16:
+                *(s16 *)place = sval;
+                break;
+        case 32:
+                *(s32 *)place = sval;
+                break;
+        case 64:
+                *(s64 *)place = sval;
+                break;
+        default:
+                pr_err("Invalid length (%d) for data relocation\n", len);
+                return 0;
+        }
+
+        /*
+         * Extract the upper value bits (including the sign bit) and
+         * shift them to bit 0.
+         */
+        sval = (s64)(sval & ~(imm_mask >> 1)) >> (len - 1);
+
+        /*
+         * Overflow has occurred if the value is not representable in
+         * len bits (i.e the bottom len bits are not sign-extended and
+         * the top bits are not all zero).
+         */
+        if ((u64)(sval + 1) > 2)
+                return -ERANGE;
+
+        return 0;
+}
+
+enum aarch64_imm_type {
+        INSN_IMM_MOVNZ,
+        INSN_IMM_MOVK,
+        INSN_IMM_ADR,
+        INSN_IMM_26,
+        INSN_IMM_19,
+        INSN_IMM_16,
+        INSN_IMM_14,
+        INSN_IMM_12,
+        INSN_IMM_9,
+};
+
+static u32 encode_insn_immediate(enum aarch64_imm_type type, u32 insn, u64 imm)
+{
+        u32 immlo, immhi, lomask, himask, mask;
+        int shift;
+
+        switch (type) {
+        case INSN_IMM_MOVNZ:
+                /*
+                 * For signed MOVW relocations, we have to manipulate the
+                 * instruction encoding depending on whether or not the
+                 * immediate is less than zero.
+                 */
+                insn &= ~(3 << 29);
+                if ((s64)imm >= 0) {
+                        /* >=0: Set the instruction to MOVZ (opcode 10b). */
+                        insn |= 2 << 29;
+                } else {
+                        /*
+                         * <0: Set the instruction to MOVN (opcode 00b).
+                         *     Since we've masked the opcode already, we
+                         *     don't need to do anything other than
+                         *     inverting the new immediate field.
+                         */
+                        imm = ~imm;
+                }
+        case INSN_IMM_MOVK:
+                mask = BIT(16) - 1;
+                shift = 5;
+                break;
+        case INSN_IMM_ADR:
+                lomask = 0x3;
+                himask = 0x7ffff;
+                immlo = imm & lomask;
+                imm >>= 2;
+                immhi = imm & himask;
+                imm = (immlo << 24) | (immhi);
+                mask = (lomask << 24) | (himask);
+                shift = 5;
+                break;
+        case INSN_IMM_26:
+                mask = BIT(26) - 1;
+                shift = 0;
+                break;
+        case INSN_IMM_19:
+                mask = BIT(19) - 1;
+                shift = 5;
+                break;
+        case INSN_IMM_16:
+                mask = BIT(16) - 1;
+                shift = 5;
+                break;
+        case INSN_IMM_14:
+                mask = BIT(14) - 1;
+                shift = 5;
+                break;
+        case INSN_IMM_12:
+                mask = BIT(12) - 1;
+                shift = 10;
+                break;
+        case INSN_IMM_9:
+                mask = BIT(9) - 1;
+                shift = 12;
+                break;
+        default:
+                pr_err("encode_insn_immediate: unknown immediate encoding %d\n",
+                        type);
+                return 0;
+        }
+
+        /* Update the immediate field. */
+        insn &= ~(mask << shift);
+        insn |= (imm & mask) << shift;
+
+        return insn;
+}
+
+static int reloc_insn_movw(enum aarch64_reloc_op op, void *place, u64 val,
+                           int lsb, enum aarch64_imm_type imm_type)
+{
+        u64 imm, limit = 0;
+        s64 sval;
+        u32 insn = *(u32 *)place;
+
+        sval = do_reloc(op, place, val);
+        sval >>= lsb;
+        imm = sval & 0xffff;
+
+        /* Update the instruction with the new encoding. */
+        *(u32 *)place = encode_insn_immediate(imm_type, insn, imm);
+
+        /* Shift out the immediate field. */
+        sval >>= 16;
+
+        /*
+         * For unsigned immediates, the overflow check is straightforward.
+         * For signed immediates, the sign bit is actually the bit past the
+         * most significant bit of the field.
+         * The INSN_IMM_16 immediate type is unsigned.
+         */
+        if (imm_type != INSN_IMM_16) {
+                sval++;
+                limit++;
+        }
+
+        /* Check the upper bits depending on the sign of the immediate. */
+        if ((u64)sval > limit)
+                return -ERANGE;
+
+        return 0;
+}
+
+static int reloc_insn_imm(enum aarch64_reloc_op op, void *place, u64 val,
+                          int lsb, int len, enum aarch64_imm_type imm_type)
+{
+        u64 imm, imm_mask;
+        s64 sval;
+        u32 insn = *(u32 *)place;
+
+        /* Calculate the relocation value. */
+        sval = do_reloc(op, place, val);
+        sval >>= lsb;
+
+        /* Extract the value bits and shift them to bit 0. */
+        imm_mask = (BIT(lsb + len) - 1) >> lsb;
+        imm = sval & imm_mask;
+
+        /* Update the instruction's immediate field. */
+        *(u32 *)place = encode_insn_immediate(imm_type, insn, imm);
+
+        /*
+         * Extract the upper value bits (including the sign bit) and
+         * shift them to bit 0.
+         */
+        sval = (s64)(sval & ~(imm_mask >> 1)) >> (len - 1);
+
+        /*
+         * Overflow has occurred if the upper bits are not all equal to
+         * the sign bit of the value.
+         */
+        if ((u64)(sval + 1) >= 2)
+                return -ERANGE;
+
+        return 0;
+}
+
+int apply_relocate_add(Elf64_Shdr *sechdrs,
+                       const char *strtab,
+                       unsigned int symindex,
+                       unsigned int relsec,
+                       struct module *me)
+{
+        unsigned int i;
+        int ovf;
+        bool overflow_check;
+        Elf64_Sym *sym;
+        void *loc;
+        u64 val;
+        Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
+
+        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
+                /* loc corresponds to P in the AArch64 ELF document. */
+                loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
+                        + rel[i].r_offset;
+
+                /* sym is the ELF symbol we're referring to. */
+                sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
+                        + ELF64_R_SYM(rel[i].r_info);
+
+                /* val corresponds to (S + A) in the AArch64 ELF document. */
+                val = sym->st_value + rel[i].r_addend;
+
+                /* Check for overflow by default. */
+                overflow_check = true;
+
+                /* Perform the static relocation. */
+                switch (ELF64_R_TYPE(rel[i].r_info)) {
+                /* Null relocations. */
+                case R_ARM_NONE:
+                case R_AARCH64_NONE:
+                        ovf = 0;
+                        break;
+
+                /* Data relocations. */
+                case R_AARCH64_ABS64:
+                        overflow_check = false;
+                        ovf = reloc_data(RELOC_OP_ABS, loc, val, 64);
+                        break;
+                case R_AARCH64_ABS32:
+                        ovf = reloc_data(RELOC_OP_ABS, loc, val, 32);
+                        break;
+                case R_AARCH64_ABS16:
+                        ovf = reloc_data(RELOC_OP_ABS, loc, val, 16);
+                        break;
+                case R_AARCH64_PREL64:
+                        overflow_check = false;
+                        ovf = reloc_data(RELOC_OP_PREL, loc, val, 64);
+                        break;
+                case R_AARCH64_PREL32:
+                        ovf = reloc_data(RELOC_OP_PREL, loc, val, 32);
+                        break;
+                case R_AARCH64_PREL16:
+                        ovf = reloc_data(RELOC_OP_PREL, loc, val, 16);
+                        break;
+
+                /* MOVW instruction relocations. */
+                case R_AARCH64_MOVW_UABS_G0_NC:
+                        overflow_check = false;
+                case R_AARCH64_MOVW_UABS_G0:
+                        ovf = reloc_insn_movw(RELOC_OP_ABS, loc, val, 0,
+                                              INSN_IMM_16);
+                        break;
+                case R_AARCH64_MOVW_UABS_G1_NC:
+                        overflow_check = false;
+                case R_AARCH64_MOVW_UABS_G1:
+                        ovf = reloc_insn_movw(RELOC_OP_ABS, loc, val, 16,
+                                              INSN_IMM_16);
+                        break;
+                case R_AARCH64_MOVW_UABS_G2_NC:
+                        overflow_check = false;
+                case R_AARCH64_MOVW_UABS_G2:
+                        ovf = reloc_insn_movw(RELOC_OP_ABS, loc, val, 32,
+                                              INSN_IMM_16);
+                        break;
+                case R_AARCH64_MOVW_UABS_G3:
+                        /* We're using the top bits so we can't overflow. */
+                        overflow_check = false;
+                        ovf = reloc_insn_movw(RELOC_OP_ABS, loc, val, 48,
+                                              INSN_IMM_16);
+                        break;
+                case R_AARCH64_MOVW_SABS_G0:
+                        ovf = reloc_insn_movw(RELOC_OP_ABS, loc, val, 0,
+                                              INSN_IMM_MOVNZ);
+                        break;
+                case R_AARCH64_MOVW_SABS_G1:
+                        ovf = reloc_insn_movw(RELOC_OP_ABS, loc, val, 16,
+                                              INSN_IMM_MOVNZ);
+                        break;
+                case R_AARCH64_MOVW_SABS_G2:
+                        ovf = reloc_insn_movw(RELOC_OP_ABS, loc, val, 32,
+                                              INSN_IMM_MOVNZ);
+                        break;
+                case R_AARCH64_MOVW_PREL_G0_NC:
+                        overflow_check = false;
+                        ovf = reloc_insn_movw(RELOC_OP_PREL, loc, val, 0,
+                                              INSN_IMM_MOVK);
+                        break;
+                case R_AARCH64_MOVW_PREL_G0:
+                        ovf = reloc_insn_movw(RELOC_OP_PREL, loc, val, 0,
+                                              INSN_IMM_MOVNZ);
+                        break;
+                case R_AARCH64_MOVW_PREL_G1_NC:
+                        overflow_check = false;
+                        ovf = reloc_insn_movw(RELOC_OP_PREL, loc, val, 16,
+                                              INSN_IMM_MOVK);
+                        break;
+                case R_AARCH64_MOVW_PREL_G1:
+                        ovf = reloc_insn_movw(RELOC_OP_PREL, loc, val, 16,
+                                              INSN_IMM_MOVNZ);
+                        break;
+                case R_AARCH64_MOVW_PREL_G2_NC:
+                        overflow_check = false;
+                        ovf = reloc_insn_movw(RELOC_OP_PREL, loc, val, 32,
+                                              INSN_IMM_MOVK);
+                        break;
+                case R_AARCH64_MOVW_PREL_G2:
+                        ovf = reloc_insn_movw(RELOC_OP_PREL, loc, val, 32,
+                                              INSN_IMM_MOVNZ);
+                        break;
+                case R_AARCH64_MOVW_PREL_G3:
+                        /* We're using the top bits so we can't overflow. */
+                        overflow_check = false;
+                        ovf = reloc_insn_movw(RELOC_OP_PREL, loc, val, 48,
+                                              INSN_IMM_MOVNZ);
+                        break;
+
+                /* Immediate instruction relocations. */
+                case R_AARCH64_LD_PREL_LO19:
+                        ovf = reloc_insn_imm(RELOC_OP_PREL, loc, val, 2, 19,
+                                             INSN_IMM_19);
+                        break;
+                case R_AARCH64_ADR_PREL_LO21:
+                        ovf = reloc_insn_imm(RELOC_OP_PREL, loc, val, 0, 21,
+                                             INSN_IMM_ADR);
+                        break;
+                case R_AARCH64_ADR_PREL_PG_HI21_NC:
+                        overflow_check = false;
+                case R_AARCH64_ADR_PREL_PG_HI21:
+                        ovf = reloc_insn_imm(RELOC_OP_PAGE, loc, val, 12, 21,
+                                             INSN_IMM_ADR);
+                        break;
+                case R_AARCH64_ADD_ABS_LO12_NC:
+                case R_AARCH64_LDST8_ABS_LO12_NC:
+                        overflow_check = false;
+                        ovf = reloc_insn_imm(RELOC_OP_ABS, loc, val, 0, 12,
+                                             INSN_IMM_12);
+                        break;
+                case R_AARCH64_LDST16_ABS_LO12_NC:
+                        overflow_check = false;
+                        ovf = reloc_insn_imm(RELOC_OP_ABS, loc, val, 1, 11,
+                                             INSN_IMM_12);
+                        break;
+                case R_AARCH64_LDST32_ABS_LO12_NC:
+                        overflow_check = false;
+                        ovf = reloc_insn_imm(RELOC_OP_ABS, loc, val, 2, 10,
+                                             INSN_IMM_12);
+                        break;
+                case R_AARCH64_LDST64_ABS_LO12_NC:
+                        overflow_check = false;
+                        ovf = reloc_insn_imm(RELOC_OP_ABS, loc, val, 3, 9,
+                                             INSN_IMM_12);
+                        break;
+                case R_AARCH64_LDST128_ABS_LO12_NC:
+                        overflow_check = false;
+                        ovf = reloc_insn_imm(RELOC_OP_ABS, loc, val, 4, 8,
+                                             INSN_IMM_12);
+                        break;
+                case R_AARCH64_TSTBR14:
+                        ovf = reloc_insn_imm(RELOC_OP_PREL, loc, val, 2, 14,
+                                             INSN_IMM_14);
+                        break;
+                case R_AARCH64_CONDBR19:
+                        ovf = reloc_insn_imm(RELOC_OP_PREL, loc, val, 2, 19,
+                                             INSN_IMM_19);
+                        break;
+                case R_AARCH64_JUMP26:
+                case R_AARCH64_CALL26:
+                        ovf = reloc_insn_imm(RELOC_OP_PREL, loc, val, 2, 26,
+                                             INSN_IMM_26);
+                        break;
+
+                default:
+                        pr_err("module %s: unsupported RELA relocation: %llu\n",
+                               me->name, ELF64_R_TYPE(rel[i].r_info));
+                        return -ENOEXEC;
+                }
+
+                if (overflow_check && ovf == -ERANGE)
+                        goto overflow;
+
+        }
+
+        return 0;
+
+overflow:
+        pr_err("module %s: overflow in relocation type %d val %Lx\n",
+               me->name, (int)ELF64_R_TYPE(rel[i].r_info), val);
+        return -ENOEXEC;
+}
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
new file mode 100644
index 00000000000..ecbf2d81ec5
--- /dev/null
+++ b/arch/arm64/kernel/perf_event.c
@@ -0,0 +1,1368 @@
+/*
+ * PMU support
+ *
+ * Copyright (C) 2012 ARM Limited
+ * Author: Will Deacon <will.deacon@arm.com>
+ *
+ * This code is based heavily on the ARMv7 perf event code.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#define pr_fmt(fmt) "hw perfevents: " fmt
+
+#include <linux/bitmap.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/perf_event.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+
+#include <asm/cputype.h>
+#include <asm/irq.h>
+#include <asm/irq_regs.h>
+#include <asm/pmu.h>
+#include <asm/stacktrace.h>
+
+/*
+ * ARMv8 supports a maximum of 32 events.
+ * The cycle counter is included in this total.
+ */
+#define ARMPMU_MAX_HWEVENTS             32
+
+static DEFINE_PER_CPU(struct perf_event * [ARMPMU_MAX_HWEVENTS], hw_events);
+static DEFINE_PER_CPU(unsigned long [BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)], used_mask);
+static DEFINE_PER_CPU(struct pmu_hw_events, cpu_hw_events);
+
+#define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu))
+
+/* Set at runtime when we know what CPU type we are. */
+static struct arm_pmu *cpu_pmu;
+
+int
+armpmu_get_max_events(void)
+{
+        int max_events = 0;
+
+        if (cpu_pmu != NULL)
+                max_events = cpu_pmu->num_events;
+
+        return max_events;
+}
+EXPORT_SYMBOL_GPL(armpmu_get_max_events);
+
+int perf_num_counters(void)
+{
+        return armpmu_get_max_events();
+}
+EXPORT_SYMBOL_GPL(perf_num_counters);
+
+#define HW_OP_UNSUPPORTED               0xFFFF
+
+#define C(_x) \
+        PERF_COUNT_HW_CACHE_##_x
+
+#define CACHE_OP_UNSUPPORTED            0xFFFF
+
+static int
+armpmu_map_cache_event(const unsigned (*cache_map)
+                                      [PERF_COUNT_HW_CACHE_MAX]
+                                      [PERF_COUNT_HW_CACHE_OP_MAX]
+                                      [PERF_COUNT_HW_CACHE_RESULT_MAX],
+                       u64 config)
+{
+        unsigned int cache_type, cache_op, cache_result, ret;
+
+        cache_type = (config >>  0) & 0xff;
+        if (cache_type >= PERF_COUNT_HW_CACHE_MAX)
+                return -EINVAL;
+
+        cache_op = (config >>  8) & 0xff;
+        if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX)
+                return -EINVAL;
+
+        cache_result = (config >> 16) & 0xff;
+        if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
+                return -EINVAL;
+
+        ret = (int)(*cache_map)[cache_type][cache_op][cache_result];
+
+        if (ret == CACHE_OP_UNSUPPORTED)
+                return -ENOENT;
+
+        return ret;
+}
+
+static int
+armpmu_map_event(const unsigned (*event_map)[PERF_COUNT_HW_MAX], u64 config)
+{
+        int mapping = (*event_map)[config];
+        return mapping == HW_OP_UNSUPPORTED ? -ENOENT : mapping;
+}
+
+static int
+armpmu_map_raw_event(u32 raw_event_mask, u64 config)
+{
+        return (int)(config & raw_event_mask);
+}
+
+static int map_cpu_event(struct perf_event *event,
+                         const unsigned (*event_map)[PERF_COUNT_HW_MAX],
+                         const unsigned (*cache_map)
+                                        [PERF_COUNT_HW_CACHE_MAX]
+                                        [PERF_COUNT_HW_CACHE_OP_MAX]
+                                        [PERF_COUNT_HW_CACHE_RESULT_MAX],
+                         u32 raw_event_mask)
+{
+        u64 config = event->attr.config;
+
+        switch (event->attr.type) {
+        case PERF_TYPE_HARDWARE:
+                return armpmu_map_event(event_map, config);
+        case PERF_TYPE_HW_CACHE:
+                return armpmu_map_cache_event(cache_map, config);
+        case PERF_TYPE_RAW:
+                return armpmu_map_raw_event(raw_event_mask, config);
+        }
+
+        return -ENOENT;
+}
+
+int
+armpmu_event_set_period(struct perf_event *event,
+                        struct hw_perf_event *hwc,
+                        int idx)
+{
+        struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+        s64 left = local64_read(&hwc->period_left);
+        s64 period = hwc->sample_period;
+        int ret = 0;
+
+        if (unlikely(left <= -period)) {
+                left = period;
+                local64_set(&hwc->period_left, left);
+                hwc->last_period = period;
+                ret = 1;
+        }
+
+        if (unlikely(left <= 0)) {
+                left += period;
+                local64_set(&hwc->period_left, left);
+                hwc->last_period = period;
+                ret = 1;
+        }
+
+        if (left > (s64)armpmu->max_period)
+                left = armpmu->max_period;
+
+        local64_set(&hwc->prev_count, (u64)-left);
+
+        armpmu->write_counter(idx, (u64)(-left) & 0xffffffff);
+
+        perf_event_update_userpage(event);
+
+        return ret;
+}
+
+u64
+armpmu_event_update(struct perf_event *event,
+                    struct hw_perf_event *hwc,
+                    int idx)
+{
+        struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+        u64 delta, prev_raw_count, new_raw_count;
+
+again:
+        prev_raw_count = local64_read(&hwc->prev_count);
+        new_raw_count = armpmu->read_counter(idx);
+
+        if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
+                             new_raw_count) != prev_raw_count)
+                goto again;
+
+        delta = (new_raw_count - prev_raw_count) & armpmu->max_period;
+
+        local64_add(delta, &event->count);
+        local64_sub(delta, &hwc->period_left);
+
+        return new_raw_count;
+}
+
+static void
+armpmu_read(struct perf_event *event)
+{
+        struct hw_perf_event *hwc = &event->hw;
+
+        /* Don't read disabled counters! */
+        if (hwc->idx < 0)
+                return;
+
+        armpmu_event_update(event, hwc, hwc->idx);
+}
+
+static void
+armpmu_stop(struct perf_event *event, int flags)
+{
+        struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+        struct hw_perf_event *hwc = &event->hw;
+
+        /*
+         * ARM pmu always has to update the counter, so ignore
+         * PERF_EF_UPDATE, see comments in armpmu_start().
+         */
+        if (!(hwc->state & PERF_HES_STOPPED)) {
+                armpmu->disable(hwc, hwc->idx);
+                barrier(); /* why? */
+                armpmu_event_update(event, hwc, hwc->idx);
+                hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
+        }
+}
+
+static void
+armpmu_start(struct perf_event *event, int flags)
+{
+        struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+        struct hw_perf_event *hwc = &event->hw;
+
+        /*
+         * ARM pmu always has to reprogram the period, so ignore
+         * PERF_EF_RELOAD, see the comment below.
+         */
+        if (flags & PERF_EF_RELOAD)
+                WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE));
+
+        hwc->state = 0;
+        /*
+         * Set the period again. Some counters can't be stopped, so when we
+         * were stopped we simply disabled the IRQ source and the counter
+         * may have been left counting. If we don't do this step then we may
+         * get an interrupt too soon or *way* too late if the overflow has
+         * happened since disabling.
+         */
+        armpmu_event_set_period(event, hwc, hwc->idx);
+        armpmu->enable(hwc, hwc->idx);
+}
+
+static void
+armpmu_del(struct perf_event *event, int flags)
+{
+        struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+        struct pmu_hw_events *hw_events = armpmu->get_hw_events();
+        struct hw_perf_event *hwc = &event->hw;
+        int idx = hwc->idx;
+
+        WARN_ON(idx < 0);
+
+        armpmu_stop(event, PERF_EF_UPDATE);
+        hw_events->events[idx] = NULL;
+        clear_bit(idx, hw_events->used_mask);
+
+        perf_event_update_userpage(event);
+}
+
+static int
+armpmu_add(struct perf_event *event, int flags)
+{
+        struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+        struct pmu_hw_events *hw_events = armpmu->get_hw_events();
+        struct hw_perf_event *hwc = &event->hw;
+        int idx;
+        int err = 0;
+
+        perf_pmu_disable(event->pmu);
+
+        /* If we don't have a space for the counter then finish early. */
+        idx = armpmu->get_event_idx(hw_events, hwc);
+        if (idx < 0) {
+                err = idx;
+                goto out;
+        }
+
+        /*
+         * If there is an event in the counter we are going to use then make
+         * sure it is disabled.
+         */
+        event->hw.idx = idx;
+        armpmu->disable(hwc, idx);
+        hw_events->events[idx] = event;
+
+        hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
+        if (flags & PERF_EF_START)
+                armpmu_start(event, PERF_EF_RELOAD);
+
+        /* Propagate our changes to the userspace mapping. */
+        perf_event_update_userpage(event);
+
+out:
+        perf_pmu_enable(event->pmu);
+        return err;
+}
+
+static int
+validate_event(struct pmu_hw_events *hw_events,
+               struct perf_event *event)
+{
+        struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+        struct hw_perf_event fake_event = event->hw;
+        struct pmu *leader_pmu = event->group_leader->pmu;
+
+        if (event->pmu != leader_pmu || event->state <= PERF_EVENT_STATE_OFF)
+                return 1;
+
+        return armpmu->get_event_idx(hw_events, &fake_event) >= 0;
+}
+
+static int
+validate_group(struct perf_event *event)
+{
+        struct perf_event *sibling, *leader = event->group_leader;
+        struct pmu_hw_events fake_pmu;
+        DECLARE_BITMAP(fake_used_mask, ARMPMU_MAX_HWEVENTS);
+
+        /*
+         * Initialise the fake PMU. We only need to populate the
+         * used_mask for the purposes of validation.
+         */
+        memset(fake_used_mask, 0, sizeof(fake_used_mask));
+        fake_pmu.used_mask = fake_used_mask;
+
+        if (!validate_event(&fake_pmu, leader))
+                return -EINVAL;
+
+        list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
+                if (!validate_event(&fake_pmu, sibling))
+                        return -EINVAL;
+        }
+
+        if (!validate_event(&fake_pmu, event))
+                return -EINVAL;
+
+        return 0;
+}
+
+static void
+armpmu_release_hardware(struct arm_pmu *armpmu)
+{
+        int i, irq, irqs;
+        struct platform_device *pmu_device = armpmu->plat_device;
+
+        irqs = min(pmu_device->num_resources, num_possible_cpus());
+
+        for (i = 0; i < irqs; ++i) {
+                if (!cpumask_test_and_clear_cpu(i, &armpmu->active_irqs))
+                        continue;
+                irq = platform_get_irq(pmu_device, i);
+                if (irq >= 0)
+                        free_irq(irq, armpmu);
+        }
+}
+
+static int
+armpmu_reserve_hardware(struct arm_pmu *armpmu)
+{
+        int i, err, irq, irqs;
+        struct platform_device *pmu_device = armpmu->plat_device;
+
+        if (!pmu_device) {
+                pr_err("no PMU device registered\n");
+                return -ENODEV;
+        }
+
+        irqs = min(pmu_device->num_resources, num_possible_cpus());
+        if (irqs < 1) {
+                pr_err("no irqs for PMUs defined\n");
+                return -ENODEV;
+        }
+
+        for (i = 0; i < irqs; ++i) {
+                err = 0;
+                irq = platform_get_irq(pmu_device, i);
+                if (irq < 0)
+                        continue;
+
+                /*
+                 * If we have a single PMU interrupt that we can't shift,
+                 * assume that we're running on a uniprocessor machine and
+                 * continue. Otherwise, continue without this interrupt.
+                 */
+                if (irq_set_affinity(irq, cpumask_of(i)) && irqs > 1) {
+                        pr_warning("unable to set irq affinity (irq=%d, cpu=%u)\n",
+                                    irq, i);
+                        continue;
+                }
+
+                err = request_irq(irq, armpmu->handle_irq,
+                                  IRQF_NOBALANCING,
+                                  "arm-pmu", armpmu);
+                if (err) {
+                        pr_err("unable to request IRQ%d for ARM PMU counters\n",
+                                irq);
+                        armpmu_release_hardware(armpmu);
+                        return err;
+                }
+
+                cpumask_set_cpu(i, &armpmu->active_irqs);
+        }
+
+        return 0;
+}
+
+static void
+hw_perf_event_destroy(struct perf_event *event)
+{
+        struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+        atomic_t *active_events  = &armpmu->active_events;
+        struct mutex *pmu_reserve_mutex = &armpmu->reserve_mutex;
+
+        if (atomic_dec_and_mutex_lock(active_events, pmu_reserve_mutex)) {
+                armpmu_release_hardware(armpmu);
+                mutex_unlock(pmu_reserve_mutex);
+        }
+}
+
+static int
+event_requires_mode_exclusion(struct perf_event_attr *attr)
+{
+        return attr->exclude_idle || attr->exclude_user ||
+               attr->exclude_kernel || attr->exclude_hv;
+}
+
+static int
+__hw_perf_event_init(struct perf_event *event)
+{
+        struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+        struct hw_perf_event *hwc = &event->hw;
+        int mapping, err;
+
+        mapping = armpmu->map_event(event);
+
+        if (mapping < 0) {
+                pr_debug("event %x:%llx not supported\n", event->attr.type,
+                         event->attr.config);
+                return mapping;
+        }
+
+        /*
+         * We don't assign an index until we actually place the event onto
+         * hardware. Use -1 to signify that we haven't decided where to put it
+         * yet. For SMP systems, each core has it's own PMU so we can't do any
+         * clever allocation or constraints checking at this point.
+         */
+        hwc->idx                = -1;
+        hwc->config_base        = 0;
+        hwc->config             = 0;
+        hwc->event_base         = 0;
+
+        /*
+         * Check whether we need to exclude the counter from certain modes.
+         */
+        if ((!armpmu->set_event_filter ||
+             armpmu->set_event_filter(hwc, &event->attr)) &&
+             event_requires_mode_exclusion(&event->attr)) {
+                pr_debug("ARM performance counters do not support mode exclusion\n");
+                return -EPERM;
+        }
+
+        /*
+         * Store the event encoding into the config_base field.
+         */
+        hwc->config_base            |= (unsigned long)mapping;
+
+        if (!hwc->sample_period) {
+                /*
+                 * For non-sampling runs, limit the sample_period to half
+                 * of the counter width. That way, the new counter value
+                 * is far less likely to overtake the previous one unless
+                 * you have some serious IRQ latency issues.
+                 */
+                hwc->sample_period  = armpmu->max_period >> 1;
+                hwc->last_period    = hwc->sample_period;
+                local64_set(&hwc->period_left, hwc->sample_period);
+        }
+
+        err = 0;
+        if (event->group_leader != event) {
+                err = validate_group(event);
+                if (err)
+                        return -EINVAL;
+        }
+
+        return err;
+}
+
+static int armpmu_event_init(struct perf_event *event)
+{
+        struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+        int err = 0;
+        atomic_t *active_events = &armpmu->active_events;
+
+        if (armpmu->map_event(event) == -ENOENT)
+                return -ENOENT;
+
+        event->destroy = hw_perf_event_destroy;
+
+        if (!atomic_inc_not_zero(active_events)) {
+                mutex_lock(&armpmu->reserve_mutex);
+                if (atomic_read(active_events) == 0)
+                        err = armpmu_reserve_hardware(armpmu);
+
+                if (!err)
+                        atomic_inc(active_events);
+                mutex_unlock(&armpmu->reserve_mutex);
+        }
+
+        if (err)
+                return err;
+
+        err = __hw_perf_event_init(event);
+        if (err)
+                hw_perf_event_destroy(event);
+
+        return err;
+}
+
+static void armpmu_enable(struct pmu *pmu)
+{
+        struct arm_pmu *armpmu = to_arm_pmu(pmu);
+        struct pmu_hw_events *hw_events = armpmu->get_hw_events();
+        int enabled = bitmap_weight(hw_events->used_mask, armpmu->num_events);
+
+        if (enabled)
+                armpmu->start();
+}
+
+static void armpmu_disable(struct pmu *pmu)
+{
+        struct arm_pmu *armpmu = to_arm_pmu(pmu);
+        armpmu->stop();
+}
+
+static void __init armpmu_init(struct arm_pmu *armpmu)
+{
+        atomic_set(&armpmu->active_events, 0);
+        mutex_init(&armpmu->reserve_mutex);
+
+        armpmu->pmu = (struct pmu) {
+                .pmu_enable     = armpmu_enable,
+                .pmu_disable    = armpmu_disable,
+                .event_init     = armpmu_event_init,
+                .add            = armpmu_add,
+                .del            = armpmu_del,
+                .start          = armpmu_start,
+                .stop           = armpmu_stop,
+                .read           = armpmu_read,
+        };
+}
+
+int __init armpmu_register(struct arm_pmu *armpmu, char *name, int type)
+{
+        armpmu_init(armpmu);
+        return perf_pmu_register(&armpmu->pmu, name, type);
+}
+
+/*
+ * ARMv8 PMUv3 Performance Events handling code.
+ * Common event types.
+ */
+enum armv8_pmuv3_perf_types {
+        /* Required events. */
+        ARMV8_PMUV3_PERFCTR_PMNC_SW_INCR                        = 0x00,
+        ARMV8_PMUV3_PERFCTR_L1_DCACHE_REFILL                    = 0x03,
+        ARMV8_PMUV3_PERFCTR_L1_DCACHE_ACCESS                    = 0x04,
+        ARMV8_PMUV3_PERFCTR_PC_BRANCH_MIS_PRED                  = 0x10,
+        ARMV8_PMUV3_PERFCTR_CLOCK_CYCLES                        = 0x11,
+        ARMV8_PMUV3_PERFCTR_PC_BRANCH_PRED                      = 0x12,
+
+        /* At least one of the following is required. */
+        ARMV8_PMUV3_PERFCTR_INSTR_EXECUTED                      = 0x08,
+        ARMV8_PMUV3_PERFCTR_OP_SPEC                             = 0x1B,
+
+        /* Common architectural events. */
+        ARMV8_PMUV3_PERFCTR_MEM_READ                            = 0x06,
+        ARMV8_PMUV3_PERFCTR_MEM_WRITE                           = 0x07,
+        ARMV8_PMUV3_PERFCTR_EXC_TAKEN                           = 0x09,
+        ARMV8_PMUV3_PERFCTR_EXC_EXECUTED                        = 0x0A,
+        ARMV8_PMUV3_PERFCTR_CID_WRITE                           = 0x0B,
+        ARMV8_PMUV3_PERFCTR_PC_WRITE                            = 0x0C,
+        ARMV8_PMUV3_PERFCTR_PC_IMM_BRANCH                       = 0x0D,
+        ARMV8_PMUV3_PERFCTR_PC_PROC_RETURN                      = 0x0E,
+        ARMV8_PMUV3_PERFCTR_MEM_UNALIGNED_ACCESS                = 0x0F,
+        ARMV8_PMUV3_PERFCTR_TTBR_WRITE                          = 0x1C,
+
+        /* Common microarchitectural events. */
+        ARMV8_PMUV3_PERFCTR_L1_ICACHE_REFILL                    = 0x01,
+        ARMV8_PMUV3_PERFCTR_ITLB_REFILL                         = 0x02,
+        ARMV8_PMUV3_PERFCTR_DTLB_REFILL                         = 0x05,
+        ARMV8_PMUV3_PERFCTR_MEM_ACCESS                          = 0x13,
+        ARMV8_PMUV3_PERFCTR_L1_ICACHE_ACCESS                    = 0x14,
+        ARMV8_PMUV3_PERFCTR_L1_DCACHE_WB                        = 0x15,
+        ARMV8_PMUV3_PERFCTR_L2_CACHE_ACCESS                     = 0x16,
+        ARMV8_PMUV3_PERFCTR_L2_CACHE_REFILL                     = 0x17,
+        ARMV8_PMUV3_PERFCTR_L2_CACHE_WB                         = 0x18,
+        ARMV8_PMUV3_PERFCTR_BUS_ACCESS                          = 0x19,
+        ARMV8_PMUV3_PERFCTR_MEM_ERROR                           = 0x1A,
+        ARMV8_PMUV3_PERFCTR_BUS_CYCLES                          = 0x1D,
+
+        /*
+         * This isn't an architected event.
+         * We detect this event number and use the cycle counter instead.
+         */
+        ARMV8_PMUV3_PERFCTR_CPU_CYCLES                          = 0xFF,
+};
+
+/* PMUv3 HW events mapping. */
+static const unsigned armv8_pmuv3_perf_map[PERF_COUNT_HW_MAX] = {
+        [PERF_COUNT_HW_CPU_CYCLES]              = ARMV8_PMUV3_PERFCTR_CPU_CYCLES,
+        [PERF_COUNT_HW_INSTRUCTIONS]            = ARMV8_PMUV3_PERFCTR_INSTR_EXECUTED,
+        [PERF_COUNT_HW_CACHE_REFERENCES]        = ARMV8_PMUV3_PERFCTR_L1_DCACHE_ACCESS,
+        [PERF_COUNT_HW_CACHE_MISSES]            = ARMV8_PMUV3_PERFCTR_L1_DCACHE_REFILL,
+        [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]     = HW_OP_UNSUPPORTED,
+        [PERF_COUNT_HW_BRANCH_MISSES]           = ARMV8_PMUV3_PERFCTR_PC_BRANCH_MIS_PRED,
+        [PERF_COUNT_HW_BUS_CYCLES]              = HW_OP_UNSUPPORTED,
+        [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = HW_OP_UNSUPPORTED,
+        [PERF_COUNT_HW_STALLED_CYCLES_BACKEND]  = HW_OP_UNSUPPORTED,
+};
+
+static const unsigned armv8_pmuv3_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
+                                                [PERF_COUNT_HW_CACHE_OP_MAX]
+                                                [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
+        [C(L1D)] = {
+                [C(OP_READ)] = {
+                        [C(RESULT_ACCESS)]      = ARMV8_PMUV3_PERFCTR_L1_DCACHE_ACCESS,
+                        [C(RESULT_MISS)]        = ARMV8_PMUV3_PERFCTR_L1_DCACHE_REFILL,
+                },
+                [C(OP_WRITE)] = {
+                        [C(RESULT_ACCESS)]      = ARMV8_PMUV3_PERFCTR_L1_DCACHE_ACCESS,
+                        [C(RESULT_MISS)]        = ARMV8_PMUV3_PERFCTR_L1_DCACHE_REFILL,
+                },
+                [C(OP_PREFETCH)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+        },
+        [C(L1I)] = {
+                [C(OP_READ)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+                [C(OP_WRITE)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+                [C(OP_PREFETCH)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+        },
+        [C(LL)] = {
+                [C(OP_READ)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+                [C(OP_WRITE)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+                [C(OP_PREFETCH)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+        },
+        [C(DTLB)] = {
+                [C(OP_READ)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+                [C(OP_WRITE)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+                [C(OP_PREFETCH)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+        },
+        [C(ITLB)] = {
+                [C(OP_READ)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+                [C(OP_WRITE)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+                [C(OP_PREFETCH)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+        },
+        [C(BPU)] = {
+                [C(OP_READ)] = {
+                        [C(RESULT_ACCESS)]      = ARMV8_PMUV3_PERFCTR_PC_BRANCH_PRED,
+                        [C(RESULT_MISS)]        = ARMV8_PMUV3_PERFCTR_PC_BRANCH_MIS_PRED,
+                },
+                [C(OP_WRITE)] = {
+                        [C(RESULT_ACCESS)]      = ARMV8_PMUV3_PERFCTR_PC_BRANCH_PRED,
+                        [C(RESULT_MISS)]        = ARMV8_PMUV3_PERFCTR_PC_BRANCH_MIS_PRED,
+                },
+                [C(OP_PREFETCH)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+        },
+        [C(NODE)] = {
+                [C(OP_READ)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+                [C(OP_WRITE)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+                [C(OP_PREFETCH)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+        },
+};
+
+/*
+ * Perf Events' indices
+ */
+#define ARMV8_IDX_CYCLE_COUNTER 0
+#define ARMV8_IDX_COUNTER0      1
+#define ARMV8_IDX_COUNTER_LAST  (ARMV8_IDX_CYCLE_COUNTER + cpu_pmu->num_events - 1)
+
+#define ARMV8_MAX_COUNTERS      32
+#define ARMV8_COUNTER_MASK      (ARMV8_MAX_COUNTERS - 1)
+
+/*
+ * ARMv8 low level PMU access
+ */
+
+/*
+ * Perf Event to low level counters mapping
+ */
+#define ARMV8_IDX_TO_COUNTER(x) \
+        (((x) - ARMV8_IDX_COUNTER0) & ARMV8_COUNTER_MASK)
+
+/*
+ * Per-CPU PMCR: config reg
+ */
+#define ARMV8_PMCR_E            (1 << 0) /* Enable all counters */
+#define ARMV8_PMCR_P            (1 << 1) /* Reset all counters */
+#define ARMV8_PMCR_C            (1 << 2) /* Cycle counter reset */
+#define ARMV8_PMCR_D            (1 << 3) /* CCNT counts every 64th cpu cycle */
+#define ARMV8_PMCR_X            (1 << 4) /* Export to ETM */
+#define ARMV8_PMCR_DP           (1 << 5) /* Disable CCNT if non-invasive debug*/
+#define ARMV8_PMCR_N_SHIFT      11       /* Number of counters supported */
+#define ARMV8_PMCR_N_MASK       0x1f
+#define ARMV8_PMCR_MASK         0x3f     /* Mask for writable bits */
+
+/*
+ * PMOVSR: counters overflow flag status reg
+ */
+#define ARMV8_OVSR_MASK         0xffffffff      /* Mask for writable bits */
+#define ARMV8_OVERFLOWED_MASK   ARMV8_OVSR_MASK
+
+/*
+ * PMXEVTYPER: Event selection reg
+ */
+#define ARMV8_EVTYPE_MASK       0xc00000ff      /* Mask for writable bits */
+#define ARMV8_EVTYPE_EVENT      0xff            /* Mask for EVENT bits */
+
+/*
+ * Event filters for PMUv3
+ */
+#define ARMV8_EXCLUDE_EL1       (1 << 31)
+#define ARMV8_EXCLUDE_EL0       (1 << 30)
+#define ARMV8_INCLUDE_EL2       (1 << 27)
+
+static inline u32 armv8pmu_pmcr_read(void)
+{
+        u32 val;
+        asm volatile("mrs %0, pmcr_el0" : "=r" (val));
+        return val;
+}
+
+static inline void armv8pmu_pmcr_write(u32 val)
+{
+        val &= ARMV8_PMCR_MASK;
+        isb();
+        asm volatile("msr pmcr_el0, %0" :: "r" (val));
+}
+
+static inline int armv8pmu_has_overflowed(u32 pmovsr)
+{
+        return pmovsr & ARMV8_OVERFLOWED_MASK;
+}
+
+static inline int armv8pmu_counter_valid(int idx)
+{
+        return idx >= ARMV8_IDX_CYCLE_COUNTER && idx <= ARMV8_IDX_COUNTER_LAST;
+}
+
+static inline int armv8pmu_counter_has_overflowed(u32 pmnc, int idx)
+{
+        int ret = 0;
+        u32 counter;
+
+        if (!armv8pmu_counter_valid(idx)) {
+                pr_err("CPU%u checking wrong counter %d overflow status\n",
+                        smp_processor_id(), idx);
+        } else {
+                counter = ARMV8_IDX_TO_COUNTER(idx);
+                ret = pmnc & BIT(counter);
+        }
+
+        return ret;
+}
+
+static inline int armv8pmu_select_counter(int idx)
+{
+        u32 counter;
+
+        if (!armv8pmu_counter_valid(idx)) {
+                pr_err("CPU%u selecting wrong PMNC counter %d\n",
+                        smp_processor_id(), idx);
+                return -EINVAL;
+        }
+
+        counter = ARMV8_IDX_TO_COUNTER(idx);
+        asm volatile("msr pmselr_el0, %0" :: "r" (counter));
+        isb();
+
+        return idx;
+}
+
+static inline u32 armv8pmu_read_counter(int idx)
+{
+        u32 value = 0;
+
+        if (!armv8pmu_counter_valid(idx))
+                pr_err("CPU%u reading wrong counter %d\n",
+                        smp_processor_id(), idx);
+        else if (idx == ARMV8_IDX_CYCLE_COUNTER)
+                asm volatile("mrs %0, pmccntr_el0" : "=r" (value));
+        else if (armv8pmu_select_counter(idx) == idx)
+                asm volatile("mrs %0, pmxevcntr_el0" : "=r" (value));
+
+        return value;
+}
+
+static inline void armv8pmu_write_counter(int idx, u32 value)
+{
+        if (!armv8pmu_counter_valid(idx))
+                pr_err("CPU%u writing wrong counter %d\n",
+                        smp_processor_id(), idx);
+        else if (idx == ARMV8_IDX_CYCLE_COUNTER)
+                asm volatile("msr pmccntr_el0, %0" :: "r" (value));
+        else if (armv8pmu_select_counter(idx) == idx)
+                asm volatile("msr pmxevcntr_el0, %0" :: "r" (value));
+}
+
+static inline void armv8pmu_write_evtype(int idx, u32 val)
+{
+        if (armv8pmu_select_counter(idx) == idx) {
+                val &= ARMV8_EVTYPE_MASK;
+                asm volatile("msr pmxevtyper_el0, %0" :: "r" (val));
+        }
+}
+
+static inline int armv8pmu_enable_counter(int idx)
+{
+        u32 counter;
+
+        if (!armv8pmu_counter_valid(idx)) {
+                pr_err("CPU%u enabling wrong PMNC counter %d\n",
+                        smp_processor_id(), idx);
+                return -EINVAL;
+        }
+
+        counter = ARMV8_IDX_TO_COUNTER(idx);
+        asm volatile("msr pmcntenset_el0, %0" :: "r" (BIT(counter)));
+        return idx;
+}
+
+static inline int armv8pmu_disable_counter(int idx)
+{
+        u32 counter;
+
+        if (!armv8pmu_counter_valid(idx)) {
+                pr_err("CPU%u disabling wrong PMNC counter %d\n",
+                        smp_processor_id(), idx);
+                return -EINVAL;
+        }
+
+        counter = ARMV8_IDX_TO_COUNTER(idx);
+        asm volatile("msr pmcntenclr_el0, %0" :: "r" (BIT(counter)));
+        return idx;
+}
+
+static inline int armv8pmu_enable_intens(int idx)
+{
+        u32 counter;
+
+        if (!armv8pmu_counter_valid(idx)) {
+                pr_err("CPU%u enabling wrong PMNC counter IRQ enable %d\n",
+                        smp_processor_id(), idx);
+                return -EINVAL;
+        }
+
+        counter = ARMV8_IDX_TO_COUNTER(idx);
+        asm volatile("msr pmintenset_el1, %0" :: "r" (BIT(counter)));
+        return idx;
+}
+
+static inline int armv8pmu_disable_intens(int idx)
+{
+        u32 counter;
+
+        if (!armv8pmu_counter_valid(idx)) {
+                pr_err("CPU%u disabling wrong PMNC counter IRQ enable %d\n",
+                        smp_processor_id(), idx);
+                return -EINVAL;
+        }
+
+        counter = ARMV8_IDX_TO_COUNTER(idx);
+        asm volatile("msr pmintenclr_el1, %0" :: "r" (BIT(counter)));
+        isb();
+        /* Clear the overflow flag in case an interrupt is pending. */
+        asm volatile("msr pmovsclr_el0, %0" :: "r" (BIT(counter)));
+        isb();
+        return idx;
+}
+
+static inline u32 armv8pmu_getreset_flags(void)
+{
+        u32 value;
+
+        /* Read */
+        asm volatile("mrs %0, pmovsclr_el0" : "=r" (value));
+
+        /* Write to clear flags */
+        value &= ARMV8_OVSR_MASK;
+        asm volatile("msr pmovsclr_el0, %0" :: "r" (value));
+
+        return value;
+}
+
+static void armv8pmu_enable_event(struct hw_perf_event *hwc, int idx)
+{
+        unsigned long flags;
+        struct pmu_hw_events *events = cpu_pmu->get_hw_events();
+
+        /*
+         * Enable counter and interrupt, and set the counter to count
+         * the event that we're interested in.
+         */
+        raw_spin_lock_irqsave(&events->pmu_lock, flags);
+
+        /*
+         * Disable counter
+         */
+        armv8pmu_disable_counter(idx);
+
+        /*
+         * Set event (if destined for PMNx counters).
+         */
+        armv8pmu_write_evtype(idx, hwc->config_base);
+
+        /*
+         * Enable interrupt for this counter
+         */
+        armv8pmu_enable_intens(idx);
+
+        /*
+         * Enable counter
+         */
+        armv8pmu_enable_counter(idx);
+
+        raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
+}
+
+static void armv8pmu_disable_event(struct hw_perf_event *hwc, int idx)
+{
+        unsigned long flags;
+        struct pmu_hw_events *events = cpu_pmu->get_hw_events();
+
+        /*
+         * Disable counter and interrupt
+         */
+        raw_spin_lock_irqsave(&events->pmu_lock, flags);
+
+        /*
+         * Disable counter
+         */
+        armv8pmu_disable_counter(idx);
+
+        /*
+         * Disable interrupt for this counter
+         */
+        armv8pmu_disable_intens(idx);
+
+        raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
+}
+
+static irqreturn_t armv8pmu_handle_irq(int irq_num, void *dev)
+{
+        u32 pmovsr;
+        struct perf_sample_data data;
+        struct pmu_hw_events *cpuc;
+        struct pt_regs *regs;
+        int idx;
+
+        /*
+         * Get and reset the IRQ flags
+         */
+        pmovsr = armv8pmu_getreset_flags();
+
+        /*
+         * Did an overflow occur?
+         */
+        if (!armv8pmu_has_overflowed(pmovsr))
+                return IRQ_NONE;
+
+        /*
+         * Handle the counter(s) overflow(s)
+         */
+        regs = get_irq_regs();
+
+        cpuc = &__get_cpu_var(cpu_hw_events);
+        for (idx = 0; idx < cpu_pmu->num_events; ++idx) {
+                struct perf_event *event = cpuc->events[idx];
+                struct hw_perf_event *hwc;
+
+                /* Ignore if we don't have an event. */
+                if (!event)
+                        continue;
+
+                /*
+                 * We have a single interrupt for all counters. Check that
+                 * each counter has overflowed before we process it.
+                 */
+                if (!armv8pmu_counter_has_overflowed(pmovsr, idx))
+                        continue;
+
+                hwc = &event->hw;
+                armpmu_event_update(event, hwc, idx);
+                perf_sample_data_init(&data, 0, hwc->last_period);
+                if (!armpmu_event_set_period(event, hwc, idx))
+                        continue;
+
+                if (perf_event_overflow(event, &data, regs))
+                        cpu_pmu->disable(hwc, idx);
+        }
+
+        /*
+         * Handle the pending perf events.
+         *
+         * Note: this call *must* be run with interrupts disabled. For
+         * platforms that can have the PMU interrupts raised as an NMI, this
+         * will not work.
+         */
+        irq_work_run();
+
+        return IRQ_HANDLED;
+}
+
+static void armv8pmu_start(void)
+{
+        unsigned long flags;
+        struct pmu_hw_events *events = cpu_pmu->get_hw_events();
+
+        raw_spin_lock_irqsave(&events->pmu_lock, flags);
+        /* Enable all counters */
+        armv8pmu_pmcr_write(armv8pmu_pmcr_read() | ARMV8_PMCR_E);
+        raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
+}
+
+static void armv8pmu_stop(void)
+{
+        unsigned long flags;
+        struct pmu_hw_events *events = cpu_pmu->get_hw_events();
+
+        raw_spin_lock_irqsave(&events->pmu_lock, flags);
+        /* Disable all counters */
+        armv8pmu_pmcr_write(armv8pmu_pmcr_read() & ~ARMV8_PMCR_E);
+        raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
+}
+
+static int armv8pmu_get_event_idx(struct pmu_hw_events *cpuc,
+                                  struct hw_perf_event *event)
+{
+        int idx;
+        unsigned long evtype = event->config_base & ARMV8_EVTYPE_EVENT;
+
+        /* Always place a cycle counter into the cycle counter. */
+        if (evtype == ARMV8_PMUV3_PERFCTR_CPU_CYCLES) {
+                if (test_and_set_bit(ARMV8_IDX_CYCLE_COUNTER, cpuc->used_mask))
+                        return -EAGAIN;
+
+                return ARMV8_IDX_CYCLE_COUNTER;
+        }
+
+        /*
+         * For anything other than a cycle counter, try and use
+         * the events counters
+         */
+        for (idx = ARMV8_IDX_COUNTER0; idx < cpu_pmu->num_events; ++idx) {
+                if (!test_and_set_bit(idx, cpuc->used_mask))
+                        return idx;
+        }
+
+        /* The counters are all in use. */
+        return -EAGAIN;
+}
+
+/*
+ * Add an event filter to a given event. This will only work for PMUv2 PMUs.
+ */
+static int armv8pmu_set_event_filter(struct hw_perf_event *event,
+                                     struct perf_event_attr *attr)
+{
+        unsigned long config_base = 0;
+
+        if (attr->exclude_idle)
+                return -EPERM;
+        if (attr->exclude_user)
+                config_base |= ARMV8_EXCLUDE_EL0;
+        if (attr->exclude_kernel)
+                config_base |= ARMV8_EXCLUDE_EL1;
+        if (!attr->exclude_hv)
+                config_base |= ARMV8_INCLUDE_EL2;
+
+        /*
+         * Install the filter into config_base as this is used to
+         * construct the event type.
+         */
+        event->config_base = config_base;
+
+        return 0;
+}
+
+static void armv8pmu_reset(void *info)
+{
+        u32 idx, nb_cnt = cpu_pmu->num_events;
+
+        /* The counter and interrupt enable registers are unknown at reset. */
+        for (idx = ARMV8_IDX_CYCLE_COUNTER; idx < nb_cnt; ++idx)
+                armv8pmu_disable_event(NULL, idx);
+
+        /* Initialize & Reset PMNC: C and P bits. */
+        armv8pmu_pmcr_write(ARMV8_PMCR_P | ARMV8_PMCR_C);
+
+        /* Disable access from userspace. */
+        asm volatile("msr pmuserenr_el0, %0" :: "r" (0));
+}
+
+static int armv8_pmuv3_map_event(struct perf_event *event)
+{
+        return map_cpu_event(event, &armv8_pmuv3_perf_map,
+                                &armv8_pmuv3_perf_cache_map, 0xFF);
+}
+
+static struct arm_pmu armv8pmu = {
+        .handle_irq             = armv8pmu_handle_irq,
+        .enable                 = armv8pmu_enable_event,
+        .disable                = armv8pmu_disable_event,
+        .read_counter           = armv8pmu_read_counter,
+        .write_counter          = armv8pmu_write_counter,
+        .get_event_idx          = armv8pmu_get_event_idx,
+        .start                  = armv8pmu_start,
+        .stop                   = armv8pmu_stop,
+        .reset                  = armv8pmu_reset,
+        .max_period             = (1LLU << 32) - 1,
+};
+
+static u32 __init armv8pmu_read_num_pmnc_events(void)
+{
+        u32 nb_cnt;
+
+        /* Read the nb of CNTx counters supported from PMNC */
+        nb_cnt = (armv8pmu_pmcr_read() >> ARMV8_PMCR_N_SHIFT) & ARMV8_PMCR_N_MASK;
+
+        /* Add the CPU cycles counter and return */
+        return nb_cnt + 1;
+}
+
+static struct arm_pmu *__init armv8_pmuv3_pmu_init(void)
+{
+        armv8pmu.name                   = "arm/armv8-pmuv3";
+        armv8pmu.map_event              = armv8_pmuv3_map_event;
+        armv8pmu.num_events             = armv8pmu_read_num_pmnc_events();
+        armv8pmu.set_event_filter       = armv8pmu_set_event_filter;
+        return &armv8pmu;
+}
+
+/*
+ * Ensure the PMU has sane values out of reset.
+ * This requires SMP to be available, so exists as a separate initcall.
+ */
+static int __init
+cpu_pmu_reset(void)
+{
+        if (cpu_pmu && cpu_pmu->reset)
+                return on_each_cpu(cpu_pmu->reset, NULL, 1);
+        return 0;
+}
+arch_initcall(cpu_pmu_reset);
+
+/*
+ * PMU platform driver and devicetree bindings.
+ */
+static struct of_device_id armpmu_of_device_ids[] = {
+        {.compatible = "arm,armv8-pmuv3"},
+        {},
+};
+
+static int __devinit armpmu_device_probe(struct platform_device *pdev)
+{
+        if (!cpu_pmu)
+                return -ENODEV;
+
+        cpu_pmu->plat_device = pdev;
+        return 0;
+}
+
+static struct platform_driver armpmu_driver = {
+        .driver         = {
+                .name   = "arm-pmu",
+                .of_match_table = armpmu_of_device_ids,
+        },
+        .probe          = armpmu_device_probe,
+};
+
+static int __init register_pmu_driver(void)
+{
+        return platform_driver_register(&armpmu_driver);
+}
+device_initcall(register_pmu_driver);
+
+static struct pmu_hw_events *armpmu_get_cpu_events(void)
+{
+        return &__get_cpu_var(cpu_hw_events);
+}
+
+static void __init cpu_pmu_init(struct arm_pmu *armpmu)
+{
+        int cpu;
+        for_each_possible_cpu(cpu) {
+                struct pmu_hw_events *events = &per_cpu(cpu_hw_events, cpu);
+                events->events = per_cpu(hw_events, cpu);
+                events->used_mask = per_cpu(used_mask, cpu);
+                raw_spin_lock_init(&events->pmu_lock);
+        }
+        armpmu->get_hw_events = armpmu_get_cpu_events;
+}
+
+static int __init init_hw_perf_events(void)
+{
+        u64 dfr = read_cpuid(ID_AA64DFR0_EL1);
+
+        switch ((dfr >> 8) & 0xf) {
+        case 0x1:       /* PMUv3 */
+                cpu_pmu = armv8_pmuv3_pmu_init();
+                break;
+        }
+
+        if (cpu_pmu) {
+                pr_info("enabled with %s PMU driver, %d counters available\n",
+                        cpu_pmu->name, cpu_pmu->num_events);
+                cpu_pmu_init(cpu_pmu);
+                armpmu_register(cpu_pmu, "cpu", PERF_TYPE_RAW);
+        } else {
+                pr_info("no hardware support available\n");
+        }
+
+        return 0;
+}
+early_initcall(init_hw_perf_events);
+
+/*
+ * Callchain handling code.
+ */
+struct frame_tail {
+        struct frame_tail   __user *fp;
+        unsigned long       lr;
+} __attribute__((packed));
+
+/*
+ * Get the return address for a single stackframe and return a pointer to the
+ * next frame tail.
+ */
+static struct frame_tail __user *
+user_backtrace(struct frame_tail __user *tail,
+               struct perf_callchain_entry *entry)
+{
+        struct frame_tail buftail;
+        unsigned long err;
+
+        /* Also check accessibility of one struct frame_tail beyond */
+        if (!access_ok(VERIFY_READ, tail, sizeof(buftail)))
+                return NULL;
+
+        pagefault_disable();
+        err = __copy_from_user_inatomic(&buftail, tail, sizeof(buftail));
+        pagefault_enable();
+
+        if (err)
+                return NULL;
+
+        perf_callchain_store(entry, buftail.lr);
+
+        /*
+         * Frame pointers should strictly progress back up the stack
+         * (towards higher addresses).
+         */
+        if (tail >= buftail.fp)
+                return NULL;
+
+        return buftail.fp;
+}
+
+void perf_callchain_user(struct perf_callchain_entry *entry,
+                         struct pt_regs *regs)
+{
+        struct frame_tail __user *tail;
+
+        tail = (struct frame_tail __user *)regs->regs[29];
+
+        while (entry->nr < PERF_MAX_STACK_DEPTH &&
+               tail && !((unsigned long)tail & 0xf))
+                tail = user_backtrace(tail, entry);
+}
+
+/*
+ * Gets called by walk_stackframe() for every stackframe. This will be called
+ * whist unwinding the stackframe and is like a subroutine return so we use
+ * the PC.
+ */
+static int callchain_trace(struct stackframe *frame, void *data)
+{
+        struct perf_callchain_entry *entry = data;
+        perf_callchain_store(entry, frame->pc);
+        return 0;
+}
+
+void perf_callchain_kernel(struct perf_callchain_entry *entry,
+                           struct pt_regs *regs)
+{
+        struct stackframe frame;
+
+        frame.fp = regs->regs[29];
+        frame.sp = regs->sp;
+        frame.pc = regs->pc;
+        walk_stackframe(&frame, callchain_trace, entry);
+}
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
new file mode 100644
index 00000000000..f22965ea1cf
--- /dev/null
+++ b/arch/arm64/kernel/process.c
@@ -0,0 +1,408 @@
+/*
+ * Based on arch/arm/kernel/process.c
+ *
+ * Original Copyright (C) 1995  Linus Torvalds
+ * Copyright (C) 1996-2000 Russell King - Converted to ARM.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdarg.h>
+
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/user.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/interrupt.h>
+#include <linux/kallsyms.h>
+#include <linux/init.h>
+#include <linux/cpu.h>
+#include <linux/elfcore.h>
+#include <linux/pm.h>
+#include <linux/tick.h>
+#include <linux/utsname.h>
+#include <linux/uaccess.h>
+#include <linux/random.h>
+#include <linux/hw_breakpoint.h>
+#include <linux/personality.h>
+#include <linux/notifier.h>
+
+#include <asm/compat.h>
+#include <asm/cacheflush.h>
+#include <asm/processor.h>
+#include <asm/stacktrace.h>
+#include <asm/fpsimd.h>
+
+static void setup_restart(void)
+{
+        /*
+         * Tell the mm system that we are going to reboot -
+         * we may need it to insert some 1:1 mappings so that
+         * soft boot works.
+         */
+        setup_mm_for_reboot();
+
+        /* Clean and invalidate caches */
+        flush_cache_all();
+
+        /* Turn D-cache off */
+        cpu_cache_off();
+
+        /* Push out any further dirty data, and ensure cache is empty */
+        flush_cache_all();
+}
+
+void soft_restart(unsigned long addr)
+{
+        setup_restart();
+        cpu_reset(addr);
+}
+
+/*
+ * Function pointers to optional machine specific functions
+ */
+void (*pm_power_off)(void);
+EXPORT_SYMBOL_GPL(pm_power_off);
+
+void (*pm_restart)(const char *cmd);
+EXPORT_SYMBOL_GPL(pm_restart);
+
+
+/*
+ * This is our default idle handler.
+ */
+static void default_idle(void)
+{
+        /*
+         * This should do all the clock switching and wait for interrupt
+         * tricks
+         */
+        cpu_do_idle();
+        local_irq_enable();
+}
+
+void (*pm_idle)(void) = default_idle;
+EXPORT_SYMBOL_GPL(pm_idle);
+
+/*
+ * The idle thread, has rather strange semantics for calling pm_idle,
+ * but this is what x86 does and we need to do the same, so that
+ * things like cpuidle get called in the same way.  The only difference
+ * is that we always respect 'hlt_counter' to prevent low power idle.
+ */
+void cpu_idle(void)
+{
+        local_fiq_enable();
+
+        /* endless idle loop with no priority at all */
+        while (1) {
+                tick_nohz_idle_enter();
+                rcu_idle_enter();
+                while (!need_resched()) {
+                        /*
+                         * We need to disable interrupts here to ensure
+                         * we don't miss a wakeup call.
+                         */
+                        local_irq_disable();
+                        if (!need_resched()) {
+                                stop_critical_timings();
+                                pm_idle();
+                                start_critical_timings();
+                                /*
+                                 * pm_idle functions should always return
+                                 * with IRQs enabled.
+                                 */
+                                WARN_ON(irqs_disabled());
+                        } else {
+                                local_irq_enable();
+                        }
+                }
+                rcu_idle_exit();
+                tick_nohz_idle_exit();
+                schedule_preempt_disabled();
+        }
+}
+
+void machine_shutdown(void)
+{
+#ifdef CONFIG_SMP
+        smp_send_stop();
+#endif
+}
+
+void machine_halt(void)
+{
+        machine_shutdown();
+        while (1);
+}
+
+void machine_power_off(void)
+{
+        machine_shutdown();
+        if (pm_power_off)
+                pm_power_off();
+}
+
+void machine_restart(char *cmd)
+{
+        machine_shutdown();
+
+        /* Disable interrupts first */
+        local_irq_disable();
+        local_fiq_disable();
+
+        /* Now call the architecture specific reboot code. */
+        if (pm_restart)
+                pm_restart(cmd);
+
+        /*
+         * Whoops - the architecture was unable to reboot.
+         */
+        printk("Reboot failed -- System halted\n");
+        while (1);
+}
+
+void __show_regs(struct pt_regs *regs)
+{
+        int i;
+
+        printk("CPU: %d    %s  (%s %.*s)\n",
+                raw_smp_processor_id(), print_tainted(),
+                init_utsname()->release,
+                (int)strcspn(init_utsname()->version, " "),
+                init_utsname()->version);
+        print_symbol("PC is at %s\n", instruction_pointer(regs));
+        print_symbol("LR is at %s\n", regs->regs[30]);
+        printk("pc : [<%016llx>] lr : [<%016llx>] pstate: %08llx\n",
+               regs->pc, regs->regs[30], regs->pstate);
+        printk("sp : %016llx\n", regs->sp);
+        for (i = 29; i >= 0; i--) {
+                printk("x%-2d: %016llx ", i, regs->regs[i]);
+                if (i % 2 == 0)
+                        printk("\n");
+        }
+        printk("\n");
+}
+
+void show_regs(struct pt_regs * regs)
+{
+        printk("\n");
+        printk("Pid: %d, comm: %20s\n", task_pid_nr(current), current->comm);
+        __show_regs(regs);
+}
+
+/*
+ * Free current thread data structures etc..
+ */
+void exit_thread(void)
+{
+}
+
+void flush_thread(void)
+{
+        fpsimd_flush_thread();
+        flush_ptrace_hw_breakpoint(current);
+}
+
+void release_thread(struct task_struct *dead_task)
+{
+}
+
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+        fpsimd_save_state(&current->thread.fpsimd_state);
+        *dst = *src;
+        return 0;
+}
+
+asmlinkage void ret_from_fork(void) asm("ret_from_fork");
+
+int copy_thread(unsigned long clone_flags, unsigned long stack_start,
+                unsigned long stk_sz, struct task_struct *p,
+                struct pt_regs *regs)
+{
+        struct pt_regs *childregs = task_pt_regs(p);
+        unsigned long tls = p->thread.tp_value;
+
+        *childregs = *regs;
+        childregs->regs[0] = 0;
+
+        if (is_compat_thread(task_thread_info(p)))
+                childregs->compat_sp = stack_start;
+        else {
+                /*
+                 * Read the current TLS pointer from tpidr_el0 as it may be
+                 * out-of-sync with the saved value.
+                 */
+                asm("mrs %0, tpidr_el0" : "=r" (tls));
+                childregs->sp = stack_start;
+        }
+
+        memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context));
+        p->thread.cpu_context.sp = (unsigned long)childregs;
+        p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
+
+        /* If a TLS pointer was passed to clone, use that for the new thread. */
+        if (clone_flags & CLONE_SETTLS)
+                tls = regs->regs[3];
+        p->thread.tp_value = tls;
+
+        ptrace_hw_copy_thread(p);
+
+        return 0;
+}
+
+static void tls_thread_switch(struct task_struct *next)
+{
+        unsigned long tpidr, tpidrro;
+
+        if (!is_compat_task()) {
+                asm("mrs %0, tpidr_el0" : "=r" (tpidr));
+                current->thread.tp_value = tpidr;
+        }
+
+        if (is_compat_thread(task_thread_info(next))) {
+                tpidr = 0;
+                tpidrro = next->thread.tp_value;
+        } else {
+                tpidr = next->thread.tp_value;
+                tpidrro = 0;
+        }
+
+        asm(
+        "       msr     tpidr_el0, %0\n"
+        "       msr     tpidrro_el0, %1"
+        : : "r" (tpidr), "r" (tpidrro));
+}
+
+/*
+ * Thread switching.
+ */
+struct task_struct *__switch_to(struct task_struct *prev,
+                                struct task_struct *next)
+{
+        struct task_struct *last;
+
+        fpsimd_thread_switch(next);
+        tls_thread_switch(next);
+        hw_breakpoint_thread_switch(next);
+
+        /* the actual thread switch */
+        last = cpu_switch_to(prev, next);
+
+        return last;
+}
+
+/*
+ * Fill in the task's elfregs structure for a core dump.
+ */
+int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs)
+{
+        elf_core_copy_regs(elfregs, task_pt_regs(t));
+        return 1;
+}
+
+/*
+ * fill in the fpe structure for a core dump...
+ */
+int dump_fpu (struct pt_regs *regs, struct user_fp *fp)
+{
+        return 0;
+}
+EXPORT_SYMBOL(dump_fpu);
+
+/*
+ * Shuffle the argument into the correct register before calling the
+ * thread function.  x1 is the thread argument, x2 is the pointer to
+ * the thread function, and x3 points to the exit function.
+ */
+extern void kernel_thread_helper(void);
+asm(    ".section .text\n"
+"       .align\n"
+"       .type   kernel_thread_helper, #function\n"
+"kernel_thread_helper:\n"
+"       mov     x0, x1\n"
+"       mov     x30, x3\n"
+"       br      x2\n"
+"       .size   kernel_thread_helper, . - kernel_thread_helper\n"
+"       .previous");
+
+#define kernel_thread_exit      do_exit
+
+/*
+ * Create a kernel thread.
+ */
+pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
+{
+        struct pt_regs regs;
+
+        memset(&regs, 0, sizeof(regs));
+
+        regs.regs[1] = (unsigned long)arg;
+        regs.regs[2] = (unsigned long)fn;
+        regs.regs[3] = (unsigned long)kernel_thread_exit;
+        regs.pc = (unsigned long)kernel_thread_helper;
+        regs.pstate = PSR_MODE_EL1h;
+
+        return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
+}
+EXPORT_SYMBOL(kernel_thread);
+
+unsigned long get_wchan(struct task_struct *p)
+{
+        struct stackframe frame;
+        int count = 0;
+        if (!p || p == current || p->state == TASK_RUNNING)
+                return 0;
+
+        frame.fp = thread_saved_fp(p);
+        frame.sp = thread_saved_sp(p);
+        frame.pc = thread_saved_pc(p);
+        do {
+                int ret = unwind_frame(&frame);
+                if (ret < 0)
+                        return 0;
+                if (!in_sched_functions(frame.pc))
+                        return frame.pc;
+        } while (count ++ < 16);
+        return 0;
+}
+
+unsigned long arch_align_stack(unsigned long sp)
+{
+        if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
+                sp -= get_random_int() & ~PAGE_MASK;
+        return sp & ~0xf;
+}
+
+static unsigned long randomize_base(unsigned long base)
+{
+        unsigned long range_end = base + (STACK_RND_MASK << PAGE_SHIFT) + 1;
+        return randomize_range(base, range_end, 0) ? : base;
+}
+
+unsigned long arch_randomize_brk(struct mm_struct *mm)
+{
+        return randomize_base(mm->brk);
+}
+
+unsigned long randomize_et_dyn(unsigned long base)
+{
+        return randomize_base(base);
+}
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
new file mode 100644
index 00000000000..ac3550ecc7b
--- /dev/null
+++ b/arch/arm64/kernel/ptrace.c
@@ -0,0 +1,1126 @@
+/*
+ * Based on arch/arm/kernel/ptrace.c
+ *
+ * By Ross Biro 1/23/92
+ * edited by Linus Torvalds
+ * ARM modifications Copyright (C) 2000 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/security.h>
+#include <linux/init.h>
+#include <linux/signal.h>
+#include <linux/uaccess.h>
+#include <linux/perf_event.h>
+#include <linux/hw_breakpoint.h>
+#include <linux/regset.h>
+#include <linux/tracehook.h>
+#include <linux/elf.h>
+
+#include <asm/compat.h>
+#include <asm/debug-monitors.h>
+#include <asm/pgtable.h>
+#include <asm/traps.h>
+#include <asm/system_misc.h>
+
+/*
+ * TODO: does not yet catch signals sent when the child dies.
+ * in exit.c or in signal.c.
+ */
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ */
+void ptrace_disable(struct task_struct *child)
+{
+}
+
+/*
+ * Handle hitting a breakpoint.
+ */
+static int ptrace_break(struct pt_regs *regs)
+{
+        siginfo_t info = {
+                .si_signo = SIGTRAP,
+                .si_errno = 0,
+                .si_code  = TRAP_BRKPT,
+                .si_addr  = (void __user *)instruction_pointer(regs),
+        };
+
+        force_sig_info(SIGTRAP, &info, current);
+        return 0;
+}
+
+static int arm64_break_trap(unsigned long addr, unsigned int esr,
+                            struct pt_regs *regs)
+{
+        return ptrace_break(regs);
+}
+
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+/*
+ * Handle hitting a HW-breakpoint.
+ */
+static void ptrace_hbptriggered(struct perf_event *bp,
+                                struct perf_sample_data *data,
+                                struct pt_regs *regs)
+{
+        struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
+        siginfo_t info = {
+                .si_signo       = SIGTRAP,
+                .si_errno       = 0,
+                .si_code        = TRAP_HWBKPT,
+                .si_addr        = (void __user *)(bkpt->trigger),
+        };
+
+#ifdef CONFIG_COMPAT
+        int i;
+
+        if (!is_compat_task())
+                goto send_sig;
+
+        for (i = 0; i < ARM_MAX_BRP; ++i) {
+                if (current->thread.debug.hbp_break[i] == bp) {
+                        info.si_errno = (i << 1) + 1;
+                        break;
+                }
+        }
+        for (i = ARM_MAX_BRP; i < ARM_MAX_HBP_SLOTS && !bp; ++i) {
+                if (current->thread.debug.hbp_watch[i] == bp) {
+                        info.si_errno = -((i << 1) + 1);
+                        break;
+                }
+        }
+
+send_sig:
+#endif
+        force_sig_info(SIGTRAP, &info, current);
+}
+
+/*
+ * Unregister breakpoints from this task and reset the pointers in
+ * the thread_struct.
+ */
+void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
+{
+        int i;
+        struct thread_struct *t = &tsk->thread;
+
+        for (i = 0; i < ARM_MAX_BRP; i++) {
+                if (t->debug.hbp_break[i]) {
+                        unregister_hw_breakpoint(t->debug.hbp_break[i]);
+                        t->debug.hbp_break[i] = NULL;
+                }
+        }
+
+        for (i = 0; i < ARM_MAX_WRP; i++) {
+                if (t->debug.hbp_watch[i]) {
+                        unregister_hw_breakpoint(t->debug.hbp_watch[i]);
+                        t->debug.hbp_watch[i] = NULL;
+                }
+        }
+}
+
+void ptrace_hw_copy_thread(struct task_struct *tsk)
+{
+        memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
+}
+
+static struct perf_event *ptrace_hbp_get_event(unsigned int note_type,
+                                               struct task_struct *tsk,
+                                               unsigned long idx)
+{
+        struct perf_event *bp = ERR_PTR(-EINVAL);
+
+        switch (note_type) {
+        case NT_ARM_HW_BREAK:
+                if (idx < ARM_MAX_BRP)
+                        bp = tsk->thread.debug.hbp_break[idx];
+                break;
+        case NT_ARM_HW_WATCH:
+                if (idx < ARM_MAX_WRP)
+                        bp = tsk->thread.debug.hbp_watch[idx];
+                break;
+        }
+
+        return bp;
+}
+
+static int ptrace_hbp_set_event(unsigned int note_type,
+                                struct task_struct *tsk,
+                                unsigned long idx,
+                                struct perf_event *bp)
+{
+        int err = -EINVAL;
+
+        switch (note_type) {
+        case NT_ARM_HW_BREAK:
+                if (idx < ARM_MAX_BRP) {
+                        tsk->thread.debug.hbp_break[idx] = bp;
+                        err = 0;
+                }
+                break;
+        case NT_ARM_HW_WATCH:
+                if (idx < ARM_MAX_WRP) {
+                        tsk->thread.debug.hbp_watch[idx] = bp;
+                        err = 0;
+                }
+                break;
+        }
+
+        return err;
+}
+
+static struct perf_event *ptrace_hbp_create(unsigned int note_type,
+                                            struct task_struct *tsk,
+                                            unsigned long idx)
+{
+        struct perf_event *bp;
+        struct perf_event_attr attr;
+        int err, type;
+
+        switch (note_type) {
+        case NT_ARM_HW_BREAK:
+                type = HW_BREAKPOINT_X;
+                break;
+        case NT_ARM_HW_WATCH:
+                type = HW_BREAKPOINT_RW;
+                break;
+        default:
+                return ERR_PTR(-EINVAL);
+        }
+
+        ptrace_breakpoint_init(&attr);
+
+        /*
+         * Initialise fields to sane defaults
+         * (i.e. values that will pass validation).
+         */
+        attr.bp_addr    = 0;
+        attr.bp_len     = HW_BREAKPOINT_LEN_4;
+        attr.bp_type    = type;
+        attr.disabled   = 1;
+
+        bp = register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, tsk);
+        if (IS_ERR(bp))
+                return bp;
+
+        err = ptrace_hbp_set_event(note_type, tsk, idx, bp);
+        if (err)
+                return ERR_PTR(err);
+
+        return bp;
+}
+
+static int ptrace_hbp_fill_attr_ctrl(unsigned int note_type,
+                                     struct arch_hw_breakpoint_ctrl ctrl,
+                                     struct perf_event_attr *attr)
+{
+        int err, len, type;
+
+        err = arch_bp_generic_fields(ctrl, &len, &type);
+        if (err)
+                return err;
+
+        switch (note_type) {
+        case NT_ARM_HW_BREAK:
+                if ((type & HW_BREAKPOINT_X) != type)
+                        return -EINVAL;
+                break;
+        case NT_ARM_HW_WATCH:
+                if ((type & HW_BREAKPOINT_RW) != type)
+                        return -EINVAL;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        attr->bp_len    = len;
+        attr->bp_type   = type;
+        attr->disabled  = !ctrl.enabled;
+
+        return 0;
+}
+
+static int ptrace_hbp_get_resource_info(unsigned int note_type, u32 *info)
+{
+        u8 num;
+        u32 reg = 0;
+
+        switch (note_type) {
+        case NT_ARM_HW_BREAK:
+                num = hw_breakpoint_slots(TYPE_INST);
+                break;
+        case NT_ARM_HW_WATCH:
+                num = hw_breakpoint_slots(TYPE_DATA);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        reg |= debug_monitors_arch();
+        reg <<= 8;
+        reg |= num;
+
+        *info = reg;
+        return 0;
+}
+
+static int ptrace_hbp_get_ctrl(unsigned int note_type,
+                               struct task_struct *tsk,
+                               unsigned long idx,
+                               u32 *ctrl)
+{
+        struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
+
+        if (IS_ERR(bp))
+                return PTR_ERR(bp);
+
+        *ctrl = bp ? encode_ctrl_reg(counter_arch_bp(bp)->ctrl) : 0;
+        return 0;
+}
+
+static int ptrace_hbp_get_addr(unsigned int note_type,
+                               struct task_struct *tsk,
+                               unsigned long idx,
+                               u64 *addr)
+{
+        struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
+
+        if (IS_ERR(bp))
+                return PTR_ERR(bp);
+
+        *addr = bp ? bp->attr.bp_addr : 0;
+        return 0;
+}
+
+static struct perf_event *ptrace_hbp_get_initialised_bp(unsigned int note_type,
+                                                        struct task_struct *tsk,
+                                                        unsigned long idx)
+{
+        struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
+
+        if (!bp)
+                bp = ptrace_hbp_create(note_type, tsk, idx);
+
+        return bp;
+}
+
+static int ptrace_hbp_set_ctrl(unsigned int note_type,
+                               struct task_struct *tsk,
+                               unsigned long idx,
+                               u32 uctrl)
+{
+        int err;
+        struct perf_event *bp;
+        struct perf_event_attr attr;
+        struct arch_hw_breakpoint_ctrl ctrl;
+
+        bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
+        if (IS_ERR(bp)) {
+                err = PTR_ERR(bp);
+                return err;
+        }
+
+        attr = bp->attr;
+        decode_ctrl_reg(uctrl, &ctrl);
+        err = ptrace_hbp_fill_attr_ctrl(note_type, ctrl, &attr);
+        if (err)
+                return err;
+
+        return modify_user_hw_breakpoint(bp, &attr);
+}
+
+static int ptrace_hbp_set_addr(unsigned int note_type,
+                               struct task_struct *tsk,
+                               unsigned long idx,
+                               u64 addr)
+{
+        int err;
+        struct perf_event *bp;
+        struct perf_event_attr attr;
+
+        bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
+        if (IS_ERR(bp)) {
+                err = PTR_ERR(bp);
+                return err;
+        }
+
+        attr = bp->attr;
+        attr.bp_addr = addr;
+        err = modify_user_hw_breakpoint(bp, &attr);
+        return err;
+}
+
+#define PTRACE_HBP_ADDR_SZ      sizeof(u64)
+#define PTRACE_HBP_CTRL_SZ      sizeof(u32)
+#define PTRACE_HBP_REG_OFF      sizeof(u32)
+
+static int hw_break_get(struct task_struct *target,
+                        const struct user_regset *regset,
+                        unsigned int pos, unsigned int count,
+                        void *kbuf, void __user *ubuf)
+{
+        unsigned int note_type = regset->core_note_type;
+        int ret, idx = 0, offset = PTRACE_HBP_REG_OFF, limit;
+        u32 info, ctrl;
+        u64 addr;
+
+        /* Resource info */
+        ret = ptrace_hbp_get_resource_info(note_type, &info);
+        if (ret)
+                return ret;
+
+        ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &info, 0, 4);
+        if (ret)
+                return ret;
+
+        /* (address, ctrl) registers */
+        limit = regset->n * regset->size;
+        while (count && offset < limit) {
+                ret = ptrace_hbp_get_addr(note_type, target, idx, &addr);
+                if (ret)
+                        return ret;
+                ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &addr,
+                                          offset, offset + PTRACE_HBP_ADDR_SZ);
+                if (ret)
+                        return ret;
+                offset += PTRACE_HBP_ADDR_SZ;
+
+                ret = ptrace_hbp_get_ctrl(note_type, target, idx, &ctrl);
+                if (ret)
+                        return ret;
+                ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &ctrl,
+                                          offset, offset + PTRACE_HBP_CTRL_SZ);
+                if (ret)
+                        return ret;
+                offset += PTRACE_HBP_CTRL_SZ;
+                idx++;
+        }
+
+        return 0;
+}
+
+static int hw_break_set(struct task_struct *target,
+                        const struct user_regset *regset,
+                        unsigned int pos, unsigned int count,
+                        const void *kbuf, const void __user *ubuf)
+{
+        unsigned int note_type = regset->core_note_type;
+        int ret, idx = 0, offset = PTRACE_HBP_REG_OFF, limit;
+        u32 ctrl;
+        u64 addr;
+
+        /* Resource info */
+        ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
+        if (ret)
+                return ret;
+
+        /* (address, ctrl) registers */
+        limit = regset->n * regset->size;
+        while (count && offset < limit) {
+                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &addr,
+                                         offset, offset + PTRACE_HBP_ADDR_SZ);
+                if (ret)
+                        return ret;
+                ret = ptrace_hbp_set_addr(note_type, target, idx, addr);
+                if (ret)
+                        return ret;
+                offset += PTRACE_HBP_ADDR_SZ;
+
+                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl,
+                                         offset, offset + PTRACE_HBP_CTRL_SZ);
+                if (ret)
+                        return ret;
+                ret = ptrace_hbp_set_ctrl(note_type, target, idx, ctrl);
+                if (ret)
+                        return ret;
+                offset += PTRACE_HBP_CTRL_SZ;
+                idx++;
+        }
+
+        return 0;
+}
+#endif  /* CONFIG_HAVE_HW_BREAKPOINT */
+
+static int gpr_get(struct task_struct *target,
+                   const struct user_regset *regset,
+                   unsigned int pos, unsigned int count,
+                   void *kbuf, void __user *ubuf)
+{
+        struct user_pt_regs *uregs = &task_pt_regs(target)->user_regs;
+        return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
+}
+
+static int gpr_set(struct task_struct *target, const struct user_regset *regset,
+                   unsigned int pos, unsigned int count,
+                   const void *kbuf, const void __user *ubuf)
+{
+        int ret;
+        struct user_pt_regs newregs;
+
+        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
+        if (ret)
+                return ret;
+
+        if (!valid_user_regs(&newregs))
+                return -EINVAL;
+
+        task_pt_regs(target)->user_regs = newregs;
+        return 0;
+}
+
+/*
+ * TODO: update fp accessors for lazy context switching (sync/flush hwstate)
+ */
+static int fpr_get(struct task_struct *target, const struct user_regset *regset,
+                   unsigned int pos, unsigned int count,
+                   void *kbuf, void __user *ubuf)
+{
+        struct user_fpsimd_state *uregs;
+        uregs = &target->thread.fpsimd_state.user_fpsimd;
+        return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
+}
+
+static int fpr_set(struct task_struct *target, const struct user_regset *regset,
+                   unsigned int pos, unsigned int count,
+                   const void *kbuf, const void __user *ubuf)
+{
+        int ret;
+        struct user_fpsimd_state newstate;
+
+        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
+        if (ret)
+                return ret;
+
+        target->thread.fpsimd_state.user_fpsimd = newstate;
+        return ret;
+}
+
+static int tls_get(struct task_struct *target, const struct user_regset *regset,
+                   unsigned int pos, unsigned int count,
+                   void *kbuf, void __user *ubuf)
+{
+        unsigned long *tls = &target->thread.tp_value;
+        return user_regset_copyout(&pos, &count, &kbuf, &ubuf, tls, 0, -1);
+}
+
+static int tls_set(struct task_struct *target, const struct user_regset *regset,
+                   unsigned int pos, unsigned int count,
+                   const void *kbuf, const void __user *ubuf)
+{
+        int ret;
+        unsigned long tls;
+
+        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
+        if (ret)
+                return ret;
+
+        target->thread.tp_value = tls;
+        return ret;
+}
+
+enum aarch64_regset {
+        REGSET_GPR,
+        REGSET_FPR,
+        REGSET_TLS,
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+        REGSET_HW_BREAK,
+        REGSET_HW_WATCH,
+#endif
+};
+
+static const struct user_regset aarch64_regsets[] = {
+        [REGSET_GPR] = {
+                .core_note_type = NT_PRSTATUS,
+                .n = sizeof(struct user_pt_regs) / sizeof(u64),
+                .size = sizeof(u64),
+                .align = sizeof(u64),
+                .get = gpr_get,
+                .set = gpr_set
+        },
+        [REGSET_FPR] = {
+                .core_note_type = NT_PRFPREG,
+                .n = sizeof(struct user_fpsimd_state) / sizeof(u32),
+                /*
+                 * We pretend we have 32-bit registers because the fpsr and
+                 * fpcr are 32-bits wide.
+                 */
+                .size = sizeof(u32),
+                .align = sizeof(u32),
+                .get = fpr_get,
+                .set = fpr_set
+        },
+        [REGSET_TLS] = {
+                .core_note_type = NT_ARM_TLS,
+                .n = 1,
+                .size = sizeof(void *),
+                .align = sizeof(void *),
+                .get = tls_get,
+                .set = tls_set,
+        },
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+        [REGSET_HW_BREAK] = {
+                .core_note_type = NT_ARM_HW_BREAK,
+                .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
+                .size = sizeof(u32),
+                .align = sizeof(u32),
+                .get = hw_break_get,
+                .set = hw_break_set,
+        },
+        [REGSET_HW_WATCH] = {
+                .core_note_type = NT_ARM_HW_WATCH,
+                .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
+                .size = sizeof(u32),
+                .align = sizeof(u32),
+                .get = hw_break_get,
+                .set = hw_break_set,
+        },
+#endif
+};
+
+static const struct user_regset_view user_aarch64_view = {
+        .name = "aarch64", .e_machine = EM_AARCH64,
+        .regsets = aarch64_regsets, .n = ARRAY_SIZE(aarch64_regsets)
+};
+
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+
+enum compat_regset {
+        REGSET_COMPAT_GPR,
+        REGSET_COMPAT_VFP,
+};
+
+static int compat_gpr_get(struct task_struct *target,
+                          const struct user_regset *regset,
+                          unsigned int pos, unsigned int count,
+                          void *kbuf, void __user *ubuf)
+{
+        int ret = 0;
+        unsigned int i, start, num_regs;
+
+        /* Calculate the number of AArch32 registers contained in count */
+        num_regs = count / regset->size;
+
+        /* Convert pos into an register number */
+        start = pos / regset->size;
+
+        if (start + num_regs > regset->n)
+                return -EIO;
+
+        for (i = 0; i < num_regs; ++i) {
+                unsigned int idx = start + i;
+                void *reg;
+
+                switch (idx) {
+                case 15:
+                        reg = (void *)&task_pt_regs(target)->pc;
+                        break;
+                case 16:
+                        reg = (void *)&task_pt_regs(target)->pstate;
+                        break;
+                case 17:
+                        reg = (void *)&task_pt_regs(target)->orig_x0;
+                        break;
+                default:
+                        reg = (void *)&task_pt_regs(target)->regs[idx];
+                }
+
+                ret = copy_to_user(ubuf, reg, sizeof(compat_ulong_t));
+
+                if (ret)
+                        break;
+                else
+                        ubuf += sizeof(compat_ulong_t);
+        }
+
+        return ret;
+}
+
+static int compat_gpr_set(struct task_struct *target,
+                          const struct user_regset *regset,
+                          unsigned int pos, unsigned int count,
+                          const void *kbuf, const void __user *ubuf)
+{
+        struct pt_regs newregs;
+        int ret = 0;
+        unsigned int i, start, num_regs;
+
+        /* Calculate the number of AArch32 registers contained in count */
+        num_regs = count / regset->size;
+
+        /* Convert pos into an register number */
+        start = pos / regset->size;
+
+        if (start + num_regs > regset->n)
+                return -EIO;
+
+        newregs = *task_pt_regs(target);
+
+        for (i = 0; i < num_regs; ++i) {
+                unsigned int idx = start + i;
+                void *reg;
+
+                switch (idx) {
+                case 15:
+                        reg = (void *)&newregs.pc;
+                        break;
+                case 16:
+                        reg = (void *)&newregs.pstate;
+                        break;
+                case 17:
+                        reg = (void *)&newregs.orig_x0;
+                        break;
+                default:
+                        reg = (void *)&newregs.regs[idx];
+                }
+
+                ret = copy_from_user(reg, ubuf, sizeof(compat_ulong_t));
+
+                if (ret)
+                        goto out;
+                else
+                        ubuf += sizeof(compat_ulong_t);
+        }
+
+        if (valid_user_regs(&newregs.user_regs))
+                *task_pt_regs(target) = newregs;
+        else
+                ret = -EINVAL;
+
+out:
+        return ret;
+}
+
+static int compat_vfp_get(struct task_struct *target,
+                          const struct user_regset *regset,
+                          unsigned int pos, unsigned int count,
+                          void *kbuf, void __user *ubuf)
+{
+        struct user_fpsimd_state *uregs;
+        compat_ulong_t fpscr;
+        int ret;
+
+        uregs = &target->thread.fpsimd_state.user_fpsimd;
+
+        /*
+         * The VFP registers are packed into the fpsimd_state, so they all sit
+         * nicely together for us. We just need to create the fpscr separately.
+         */
+        ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
+                                  VFP_STATE_SIZE - sizeof(compat_ulong_t));
+
+        if (count && !ret) {
+                fpscr = (uregs->fpsr & VFP_FPSCR_STAT_MASK) |
+                        (uregs->fpcr & VFP_FPSCR_CTRL_MASK);
+                ret = put_user(fpscr, (compat_ulong_t *)ubuf);
+        }
+
+        return ret;
+}
+
+static int compat_vfp_set(struct task_struct *target,
+                          const struct user_regset *regset,
+                          unsigned int pos, unsigned int count,
+                          const void *kbuf, const void __user *ubuf)
+{
+        struct user_fpsimd_state *uregs;
+        compat_ulong_t fpscr;
+        int ret;
+
+        if (pos + count > VFP_STATE_SIZE)
+                return -EIO;
+
+        uregs = &target->thread.fpsimd_state.user_fpsimd;
+
+        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
+                                 VFP_STATE_SIZE - sizeof(compat_ulong_t));
+
+        if (count && !ret) {
+                ret = get_user(fpscr, (compat_ulong_t *)ubuf);
+                uregs->fpsr = fpscr & VFP_FPSCR_STAT_MASK;
+                uregs->fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
+        }
+
+        return ret;
+}
+
+static const struct user_regset aarch32_regsets[] = {
+        [REGSET_COMPAT_GPR] = {
+                .core_note_type = NT_PRSTATUS,
+                .n = COMPAT_ELF_NGREG,
+                .size = sizeof(compat_elf_greg_t),
+                .align = sizeof(compat_elf_greg_t),
+                .get = compat_gpr_get,
+                .set = compat_gpr_set
+        },
+        [REGSET_COMPAT_VFP] = {
+                .core_note_type = NT_ARM_VFP,
+                .n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
+                .size = sizeof(compat_ulong_t),
+                .align = sizeof(compat_ulong_t),
+                .get = compat_vfp_get,
+                .set = compat_vfp_set
+        },
+};
+
+static const struct user_regset_view user_aarch32_view = {
+        .name = "aarch32", .e_machine = EM_ARM,
+        .regsets = aarch32_regsets, .n = ARRAY_SIZE(aarch32_regsets)
+};
+
+int aarch32_break_trap(struct pt_regs *regs)
+{
+        unsigned int instr;
+        bool bp = false;
+        void __user *pc = (void __user *)instruction_pointer(regs);
+
+        if (compat_thumb_mode(regs)) {
+                /* get 16-bit Thumb instruction */
+                get_user(instr, (u16 __user *)pc);
+                if (instr == AARCH32_BREAK_THUMB2_LO) {
+                        /* get second half of 32-bit Thumb-2 instruction */
+                        get_user(instr, (u16 __user *)(pc + 2));
+                        bp = instr == AARCH32_BREAK_THUMB2_HI;
+                } else {
+                        bp = instr == AARCH32_BREAK_THUMB;
+                }
+        } else {
+                /* 32-bit ARM instruction */
+                get_user(instr, (u32 __user *)pc);
+                bp = (instr & ~0xf0000000) == AARCH32_BREAK_ARM;
+        }
+
+        if (bp)
+                return ptrace_break(regs);
+        return 1;
+}
+
+static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off,
+                                   compat_ulong_t __user *ret)
+{
+        compat_ulong_t tmp;
+
+        if (off & 3)
+                return -EIO;
+
+        if (off == PT_TEXT_ADDR)
+                tmp = tsk->mm->start_code;
+        else if (off == PT_DATA_ADDR)
+                tmp = tsk->mm->start_data;
+        else if (off == PT_TEXT_END_ADDR)
+                tmp = tsk->mm->end_code;
+        else if (off < sizeof(compat_elf_gregset_t))
+                return copy_regset_to_user(tsk, &user_aarch32_view,
+                                           REGSET_COMPAT_GPR, off,
+                                           sizeof(compat_ulong_t), ret);
+        else if (off >= COMPAT_USER_SZ)
+                return -EIO;
+        else
+                tmp = 0;
+
+        return put_user(tmp, ret);
+}
+
+static int compat_ptrace_write_user(struct task_struct *tsk, compat_ulong_t off,
+                                    compat_ulong_t val)
+{
+        int ret;
+
+        if (off & 3 || off >= COMPAT_USER_SZ)
+                return -EIO;
+
+        if (off >= sizeof(compat_elf_gregset_t))
+                return 0;
+
+        ret = copy_regset_from_user(tsk, &user_aarch32_view,
+                                    REGSET_COMPAT_GPR, off,
+                                    sizeof(compat_ulong_t),
+                                    &val);
+        return ret;
+}
+
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+
+/*
+ * Convert a virtual register number into an index for a thread_info
+ * breakpoint array. Breakpoints are identified using positive numbers
+ * whilst watchpoints are negative. The registers are laid out as pairs
+ * of (address, control), each pair mapping to a unique hw_breakpoint struct.
+ * Register 0 is reserved for describing resource information.
+ */
+static int compat_ptrace_hbp_num_to_idx(compat_long_t num)
+{
+        return (abs(num) - 1) >> 1;
+}
+
+static int compat_ptrace_hbp_get_resource_info(u32 *kdata)
+{
+        u8 num_brps, num_wrps, debug_arch, wp_len;
+        u32 reg = 0;
+
+        num_brps        = hw_breakpoint_slots(TYPE_INST);
+        num_wrps        = hw_breakpoint_slots(TYPE_DATA);
+
+        debug_arch      = debug_monitors_arch();
+        wp_len          = 8;
+        reg             |= debug_arch;
+        reg             <<= 8;
+        reg             |= wp_len;
+        reg             <<= 8;
+        reg             |= num_wrps;
+        reg             <<= 8;
+        reg             |= num_brps;
+
+        *kdata = reg;
+        return 0;
+}
+
+static int compat_ptrace_hbp_get(unsigned int note_type,
+                                 struct task_struct *tsk,
+                                 compat_long_t num,
+                                 u32 *kdata)
+{
+        u64 addr = 0;
+        u32 ctrl = 0;
+
+        int err, idx = compat_ptrace_hbp_num_to_idx(num);;
+
+        if (num & 1) {
+                err = ptrace_hbp_get_addr(note_type, tsk, idx, &addr);
+                *kdata = (u32)addr;
+        } else {
+                err = ptrace_hbp_get_ctrl(note_type, tsk, idx, &ctrl);
+                *kdata = ctrl;
+        }
+
+        return err;
+}
+
+static int compat_ptrace_hbp_set(unsigned int note_type,
+                                 struct task_struct *tsk,
+                                 compat_long_t num,
+                                 u32 *kdata)
+{
+        u64 addr;
+        u32 ctrl;
+
+        int err, idx = compat_ptrace_hbp_num_to_idx(num);
+
+        if (num & 1) {
+                addr = *kdata;
+                err = ptrace_hbp_set_addr(note_type, tsk, idx, addr);
+        } else {
+                ctrl = *kdata;
+                err = ptrace_hbp_set_ctrl(note_type, tsk, idx, ctrl);
+        }
+
+        return err;
+}
+
+static int compat_ptrace_gethbpregs(struct task_struct *tsk, compat_long_t num,
+                                    compat_ulong_t __user *data)
+{
+        int ret;
+        u32 kdata;
+        mm_segment_t old_fs = get_fs();
+
+        set_fs(KERNEL_DS);
+        /* Watchpoint */
+        if (num < 0) {
+                ret = compat_ptrace_hbp_get(NT_ARM_HW_WATCH, tsk, num, &kdata);
+        /* Resource info */
+        } else if (num == 0) {
+                ret = compat_ptrace_hbp_get_resource_info(&kdata);
+        /* Breakpoint */
+        } else {
+                ret = compat_ptrace_hbp_get(NT_ARM_HW_BREAK, tsk, num, &kdata);
+        }
+        set_fs(old_fs);
+
+        if (!ret)
+                ret = put_user(kdata, data);
+
+        return ret;
+}
+
+static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num,
+                                    compat_ulong_t __user *data)
+{
+        int ret;
+        u32 kdata = 0;
+        mm_segment_t old_fs = get_fs();
+
+        if (num == 0)
+                return 0;
+
+        ret = get_user(kdata, data);
+        if (ret)
+                return ret;
+
+        set_fs(KERNEL_DS);
+        if (num < 0)
+                ret = compat_ptrace_hbp_set(NT_ARM_HW_WATCH, tsk, num, &kdata);
+        else
+                ret = compat_ptrace_hbp_set(NT_ARM_HW_BREAK, tsk, num, &kdata);
+        set_fs(old_fs);
+
+        return ret;
+}
+#endif  /* CONFIG_HAVE_HW_BREAKPOINT */
+
+long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
+                        compat_ulong_t caddr, compat_ulong_t cdata)
+{
+        unsigned long addr = caddr;
+        unsigned long data = cdata;
+        void __user *datap = compat_ptr(data);
+        int ret;
+
+        switch (request) {
+                case PTRACE_PEEKUSR:
+                        ret = compat_ptrace_read_user(child, addr, datap);
+                        break;
+
+                case PTRACE_POKEUSR:
+                        ret = compat_ptrace_write_user(child, addr, data);
+                        break;
+
+                case COMPAT_PTRACE_GETREGS:
+                        ret = copy_regset_to_user(child,
+                                                  &user_aarch32_view,
+                                                  REGSET_COMPAT_GPR,
+                                                  0, sizeof(compat_elf_gregset_t),
+                                                  datap);
+                        break;
+
+                case COMPAT_PTRACE_SETREGS:
+                        ret = copy_regset_from_user(child,
+                                                    &user_aarch32_view,
+                                                    REGSET_COMPAT_GPR,
+                                                    0, sizeof(compat_elf_gregset_t),
+                                                    datap);
+                        break;
+
+                case COMPAT_PTRACE_GET_THREAD_AREA:
+                        ret = put_user((compat_ulong_t)child->thread.tp_value,
+                                       (compat_ulong_t __user *)datap);
+                        break;
+
+                case COMPAT_PTRACE_SET_SYSCALL:
+                        task_pt_regs(child)->syscallno = data;
+                        ret = 0;
+                        break;
+
+                case COMPAT_PTRACE_GETVFPREGS:
+                        ret = copy_regset_to_user(child,
+                                                  &user_aarch32_view,
+                                                  REGSET_COMPAT_VFP,
+                                                  0, VFP_STATE_SIZE,
+                                                  datap);
+                        break;
+
+                case COMPAT_PTRACE_SETVFPREGS:
+                        ret = copy_regset_from_user(child,
+                                                    &user_aarch32_view,
+                                                    REGSET_COMPAT_VFP,
+                                                    0, VFP_STATE_SIZE,
+                                                    datap);
+                        break;
+
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+                case COMPAT_PTRACE_GETHBPREGS:
+                        ret = compat_ptrace_gethbpregs(child, addr, datap);
+                        break;
+
+                case COMPAT_PTRACE_SETHBPREGS:
+                        ret = compat_ptrace_sethbpregs(child, addr, datap);
+                        break;
+#endif
+
+                default:
+                        ret = compat_ptrace_request(child, request, addr,
+                                                    data);
+                        break;
+        }
+
+        return ret;
+}
+#endif /* CONFIG_COMPAT */
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+#ifdef CONFIG_COMPAT
+        if (is_compat_thread(task_thread_info(task)))
+                return &user_aarch32_view;
+#endif
+        return &user_aarch64_view;
+}
+
+long arch_ptrace(struct task_struct *child, long request,
+                 unsigned long addr, unsigned long data)
+{
+        return ptrace_request(child, request, addr, data);
+}
+
+
+static int __init ptrace_break_init(void)
+{
+        hook_debug_fault_code(DBG_ESR_EVT_BRK, arm64_break_trap, SIGTRAP,
+                              TRAP_BRKPT, "ptrace BRK handler");
+        return 0;
+}
+core_initcall(ptrace_break_init);
+
+
+asmlinkage int syscall_trace(int dir, struct pt_regs *regs)
+{
+        unsigned long saved_reg;
+
+        if (!test_thread_flag(TIF_SYSCALL_TRACE))
+                return regs->syscallno;
+
+        if (is_compat_task()) {
+                /* AArch32 uses ip (r12) for scratch */
+                saved_reg = regs->regs[12];
+                regs->regs[12] = dir;
+        } else {
+                /*
+                 * Save X7. X7 is used to denote syscall entry/exit:
+                 *   X7 = 0 -> entry, = 1 -> exit
+                 */
+                saved_reg = regs->regs[7];
+                regs->regs[7] = dir;
+        }
+
+        if (dir)
+                tracehook_report_syscall_exit(regs, 0);
+        else if (tracehook_report_syscall_entry(regs))
+                regs->syscallno = ~0UL;
+
+        if (is_compat_task())
+                regs->regs[12] = saved_reg;
+        else
+                regs->regs[7] = saved_reg;
+
+        return regs->syscallno;
+}
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
new file mode 100644
index 00000000000..48ffb9fb3fe
--- /dev/null
+++ b/arch/arm64/kernel/setup.c
@@ -0,0 +1,347 @@
+/*
+ * Based on arch/arm/kernel/setup.c
+ *
+ * Copyright (C) 1995-2001 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/utsname.h>
+#include <linux/initrd.h>
+#include <linux/console.h>
+#include <linux/bootmem.h>
+#include <linux/seq_file.h>
+#include <linux/screen_info.h>
+#include <linux/init.h>
+#include <linux/kexec.h>
+#include <linux/crash_dump.h>
+#include <linux/root_dev.h>
+#include <linux/cpu.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/memblock.h>
+#include <linux/of_fdt.h>
+
+#include <asm/cputype.h>
+#include <asm/elf.h>
+#include <asm/cputable.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/traps.h>
+#include <asm/memblock.h>
+
+unsigned int processor_id;
+EXPORT_SYMBOL(processor_id);
+
+unsigned int elf_hwcap __read_mostly;
+EXPORT_SYMBOL_GPL(elf_hwcap);
+
+static const char *cpu_name;
+static const char *machine_name;
+phys_addr_t __fdt_pointer __initdata;
+
+/*
+ * Standard memory resources
+ */
+static struct resource mem_res[] = {
+        {
+                .name = "Kernel code",
+                .start = 0,
+                .end = 0,
+                .flags = IORESOURCE_MEM
+        },
+        {
+                .name = "Kernel data",
+                .start = 0,
+                .end = 0,
+                .flags = IORESOURCE_MEM
+        }
+};
+
+#define kernel_code mem_res[0]
+#define kernel_data mem_res[1]
+
+void __init early_print(const char *str, ...)
+{
+        char buf[256];
+        va_list ap;
+
+        va_start(ap, str);
+        vsnprintf(buf, sizeof(buf), str, ap);
+        va_end(ap);
+
+        printk("%s", buf);
+}
+
+static void __init setup_processor(void)
+{
+        struct cpu_info *cpu_info;
+
+        /*
+         * locate processor in the list of supported processor
+         * types.  The linker builds this table for us from the
+         * entries in arch/arm/mm/proc.S
+         */
+        cpu_info = lookup_processor_type(read_cpuid_id());
+        if (!cpu_info) {
+                printk("CPU configuration botched (ID %08x), unable to continue.\n",
+                       read_cpuid_id());
+                while (1);
+        }
+
+        cpu_name = cpu_info->cpu_name;
+
+        printk("CPU: %s [%08x] revision %d\n",
+               cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
+
+        sprintf(init_utsname()->machine, "aarch64");
+        elf_hwcap = 0;
+}
+
+static void __init setup_machine_fdt(phys_addr_t dt_phys)
+{
+        struct boot_param_header *devtree;
+        unsigned long dt_root;
+
+        /* Check we have a non-NULL DT pointer */
+        if (!dt_phys) {
+                early_print("\n"
+                        "Error: NULL or invalid device tree blob\n"
+                        "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
+                        "\nPlease check your bootloader.\n");
+
+                while (true)
+                        cpu_relax();
+
+        }
+
+        devtree = phys_to_virt(dt_phys);
+
+        /* Check device tree validity */
+        if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) {
+                early_print("\n"
+                        "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
+                        "Expected 0x%x, found 0x%x\n"
+                        "\nPlease check your bootloader.\n",
+                        dt_phys, devtree, OF_DT_HEADER,
+                        be32_to_cpu(devtree->magic));
+
+                while (true)
+                        cpu_relax();
+        }
+
+        initial_boot_params = devtree;
+        dt_root = of_get_flat_dt_root();
+
+        machine_name = of_get_flat_dt_prop(dt_root, "model", NULL);
+        if (!machine_name)
+                machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
+        if (!machine_name)
+                machine_name = "<unknown>";
+        pr_info("Machine: %s\n", machine_name);
+
+        /* Retrieve various information from the /chosen node */
+        of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
+        /* Initialize {size,address}-cells info */
+        of_scan_flat_dt(early_init_dt_scan_root, NULL);
+        /* Setup memory, calling early_init_dt_add_memory_arch */
+        of_scan_flat_dt(early_init_dt_scan_memory, NULL);
+}
+
+void __init early_init_dt_add_memory_arch(u64 base, u64 size)
+{
+        size &= PAGE_MASK;
+        memblock_add(base, size);
+}
+
+void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
+{
+        return __va(memblock_alloc(size, align));
+}
+
+/*
+ * Limit the memory size that was specified via FDT.
+ */
+static int __init early_mem(char *p)
+{
+        phys_addr_t limit;
+
+        if (!p)
+                return 1;
+
+        limit = memparse(p, &p) & PAGE_MASK;
+        pr_notice("Memory limited to %lldMB\n", limit >> 20);
+
+        memblock_enforce_memory_limit(limit);
+
+        return 0;
+}
+early_param("mem", early_mem);
+
+static void __init request_standard_resources(void)
+{
+        struct memblock_region *region;
+        struct resource *res;
+
+        kernel_code.start   = virt_to_phys(_text);
+        kernel_code.end     = virt_to_phys(_etext - 1);
+        kernel_data.start   = virt_to_phys(_sdata);
+        kernel_data.end     = virt_to_phys(_end - 1);
+
+        for_each_memblock(memory, region) {
+                res = alloc_bootmem_low(sizeof(*res));
+                res->name  = "System RAM";
+                res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
+                res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
+                res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+
+                request_resource(&iomem_resource, res);
+
+                if (kernel_code.start >= res->start &&
+                    kernel_code.end <= res->end)
+                        request_resource(res, &kernel_code);
+                if (kernel_data.start >= res->start &&
+                    kernel_data.end <= res->end)
+                        request_resource(res, &kernel_data);
+        }
+}
+
+void __init setup_arch(char **cmdline_p)
+{
+        setup_processor();
+
+        setup_machine_fdt(__fdt_pointer);
+
+        init_mm.start_code = (unsigned long) _text;
+        init_mm.end_code   = (unsigned long) _etext;
+        init_mm.end_data   = (unsigned long) _edata;
+        init_mm.brk        = (unsigned long) _end;
+
+        *cmdline_p = boot_command_line;
+
+        parse_early_param();
+
+        arm64_memblock_init();
+
+        paging_init();
+        request_standard_resources();
+
+        unflatten_device_tree();
+
+#ifdef CONFIG_SMP
+        smp_init_cpus();
+#endif
+
+#ifdef CONFIG_VT
+#if defined(CONFIG_VGA_CONSOLE)
+        conswitchp = &vga_con;
+#elif defined(CONFIG_DUMMY_CONSOLE)
+        conswitchp = &dummy_con;
+#endif
+#endif
+}
+
+static DEFINE_PER_CPU(struct cpu, cpu_data);
+
+static int __init topology_init(void)
+{
+        int i;
+
+        for_each_possible_cpu(i) {
+                struct cpu *cpu = &per_cpu(cpu_data, i);
+                cpu->hotpluggable = 1;
+                register_cpu(cpu, i);
+        }
+
+        return 0;
+}
+subsys_initcall(topology_init);
+
+static const char *hwcap_str[] = {
+        "fp",
+        "asimd",
+        NULL
+};
+
+static int c_show(struct seq_file *m, void *v)
+{
+        int i;
+
+        seq_printf(m, "Processor\t: %s rev %d (%s)\n",
+                   cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
+
+        for_each_online_cpu(i) {
+                /*
+                 * glibc reads /proc/cpuinfo to determine the number of
+                 * online processors, looking for lines beginning with
+                 * "processor".  Give glibc what it expects.
+                 */
+#ifdef CONFIG_SMP
+                seq_printf(m, "processor\t: %d\n", i);
+#endif
+                seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
+                           loops_per_jiffy / (500000UL/HZ),
+                           loops_per_jiffy / (5000UL/HZ) % 100);
+        }
+
+        /* dump out the processor features */
+        seq_puts(m, "Features\t: ");
+
+        for (i = 0; hwcap_str[i]; i++)
+                if (elf_hwcap & (1 << i))
+                        seq_printf(m, "%s ", hwcap_str[i]);
+
+        seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
+        seq_printf(m, "CPU architecture: AArch64\n");
+        seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
+        seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
+        seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
+
+        seq_puts(m, "\n");
+
+        seq_printf(m, "Hardware\t: %s\n", machine_name);
+
+        return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+        return *pos < 1 ? (void *)1 : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        ++*pos;
+        return NULL;
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+const struct seq_operations cpuinfo_op = {
+        .start  = c_start,
+        .next   = c_next,
+        .stop   = c_stop,
+        .show   = c_show
+};
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
new file mode 100644
index 00000000000..8807ba2cf26
--- /dev/null
+++ b/arch/arm64/kernel/signal.c
@@ -0,0 +1,437 @@
+/*
+ * Based on arch/arm/kernel/signal.c
+ *
+ * Copyright (C) 1995-2009 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/personality.h>
+#include <linux/freezer.h>
+#include <linux/uaccess.h>
+#include <linux/tracehook.h>
+#include <linux/ratelimit.h>
+
+#include <asm/compat.h>
+#include <asm/debug-monitors.h>
+#include <asm/elf.h>
+#include <asm/cacheflush.h>
+#include <asm/ucontext.h>
+#include <asm/unistd.h>
+#include <asm/fpsimd.h>
+#include <asm/signal32.h>
+#include <asm/vdso.h>
+
+/*
+ * Do a signal return; undo the signal stack. These are aligned to 128-bit.
+ */
+struct rt_sigframe {
+        struct siginfo info;
+        struct ucontext uc;
+};
+
+static int preserve_fpsimd_context(struct fpsimd_context __user *ctx)
+{
+        struct fpsimd_state *fpsimd = &current->thread.fpsimd_state;
+        int err;
+
+        /* dump the hardware registers to the fpsimd_state structure */
+        fpsimd_save_state(fpsimd);
+
+        /* copy the FP and status/control registers */
+        err = __copy_to_user(ctx->vregs, fpsimd->vregs, sizeof(fpsimd->vregs));
+        __put_user_error(fpsimd->fpsr, &ctx->fpsr, err);
+        __put_user_error(fpsimd->fpcr, &ctx->fpcr, err);
+
+        /* copy the magic/size information */
+        __put_user_error(FPSIMD_MAGIC, &ctx->head.magic, err);
+        __put_user_error(sizeof(struct fpsimd_context), &ctx->head.size, err);
+
+        return err ? -EFAULT : 0;
+}
+
+static int restore_fpsimd_context(struct fpsimd_context __user *ctx)
+{
+        struct fpsimd_state fpsimd;
+        __u32 magic, size;
+        int err = 0;
+
+        /* check the magic/size information */
+        __get_user_error(magic, &ctx->head.magic, err);
+        __get_user_error(size, &ctx->head.size, err);
+        if (err)
+                return -EFAULT;
+        if (magic != FPSIMD_MAGIC || size != sizeof(struct fpsimd_context))
+                return -EINVAL;
+
+        /* copy the FP and status/control registers */
+        err = __copy_from_user(fpsimd.vregs, ctx->vregs,
+                               sizeof(fpsimd.vregs));
+        __get_user_error(fpsimd.fpsr, &ctx->fpsr, err);
+        __get_user_error(fpsimd.fpcr, &ctx->fpcr, err);
+
+        /* load the hardware registers from the fpsimd_state structure */
+        if (!err) {
+                preempt_disable();
+                fpsimd_load_state(&fpsimd);
+                preempt_enable();
+        }
+
+        return err ? -EFAULT : 0;
+}
+
+static int restore_sigframe(struct pt_regs *regs,
+                            struct rt_sigframe __user *sf)
+{
+        sigset_t set;
+        int i, err;
+        struct aux_context __user *aux =
+                (struct aux_context __user *)sf->uc.uc_mcontext.__reserved;
+
+        err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
+        if (err == 0)
+                set_current_blocked(&set);
+
+        for (i = 0; i < 31; i++)
+                __get_user_error(regs->regs[i], &sf->uc.uc_mcontext.regs[i],
+                                 err);
+        __get_user_error(regs->sp, &sf->uc.uc_mcontext.sp, err);
+        __get_user_error(regs->pc, &sf->uc.uc_mcontext.pc, err);
+        __get_user_error(regs->pstate, &sf->uc.uc_mcontext.pstate, err);
+
+        /*
+         * Avoid sys_rt_sigreturn() restarting.
+         */
+        regs->syscallno = ~0UL;
+
+        err |= !valid_user_regs(&regs->user_regs);
+
+        if (err == 0)
+                err |= restore_fpsimd_context(&aux->fpsimd);
+
+        return err;
+}
+
+asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
+{
+        struct rt_sigframe __user *frame;
+
+        /* Always make any pending restarted system calls return -EINTR */
+        current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+        /*
+         * Since we stacked the signal on a 128-bit boundary, then 'sp' should
+         * be word aligned here.
+         */
+        if (regs->sp & 15)
+                goto badframe;
+
+        frame = (struct rt_sigframe __user *)regs->sp;
+
+        if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
+                goto badframe;
+
+        if (restore_sigframe(regs, frame))
+                goto badframe;
+
+        if (do_sigaltstack(&frame->uc.uc_stack,
+                           NULL, regs->sp) == -EFAULT)
+                goto badframe;
+
+        return regs->regs[0];
+
+badframe:
+        if (show_unhandled_signals)
+                pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
+                                    current->comm, task_pid_nr(current), __func__,
+                                    regs->pc, regs->sp);
+        force_sig(SIGSEGV, current);
+        return 0;
+}
+
+asmlinkage long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
+                                unsigned long sp)
+{
+        return do_sigaltstack(uss, uoss, sp);
+}
+
+static int setup_sigframe(struct rt_sigframe __user *sf,
+                          struct pt_regs *regs, sigset_t *set)
+{
+        int i, err = 0;
+        struct aux_context __user *aux =
+                (struct aux_context __user *)sf->uc.uc_mcontext.__reserved;
+
+        for (i = 0; i < 31; i++)
+                __put_user_error(regs->regs[i], &sf->uc.uc_mcontext.regs[i],
+                                 err);
+        __put_user_error(regs->sp, &sf->uc.uc_mcontext.sp, err);
+        __put_user_error(regs->pc, &sf->uc.uc_mcontext.pc, err);
+        __put_user_error(regs->pstate, &sf->uc.uc_mcontext.pstate, err);
+
+        __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err);
+
+        err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set));
+
+        if (err == 0)
+                err |= preserve_fpsimd_context(&aux->fpsimd);
+
+        /* set the "end" magic */
+        __put_user_error(0, &aux->end.magic, err);
+        __put_user_error(0, &aux->end.size, err);
+
+        return err;
+}
+
+static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
+                                 int framesize)
+{
+        unsigned long sp, sp_top;
+        void __user *frame;
+
+        sp = sp_top = regs->sp;
+
+        /*
+         * This is the X/Open sanctioned signal stack switching.
+         */
+        if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
+                sp = sp_top = current->sas_ss_sp + current->sas_ss_size;
+
+        /* room for stack frame (FP, LR) */
+        sp -= 16;
+
+        sp = (sp - framesize) & ~15;
+        frame = (void __user *)sp;
+
+        /*
+         * Check that we can actually write to the signal frame.
+         */
+        if (!access_ok(VERIFY_WRITE, frame, sp_top - sp))
+                frame = NULL;
+
+        return frame;
+}
+
+static int setup_return(struct pt_regs *regs, struct k_sigaction *ka,
+                        void __user *frame, int usig)
+{
+        int err = 0;
+        __sigrestore_t sigtramp;
+        unsigned long __user *sp = (unsigned long __user *)regs->sp;
+
+        /* set up the stack frame */
+        __put_user_error(regs->regs[29], sp - 2, err);
+        __put_user_error(regs->regs[30], sp - 1, err);
+
+        regs->regs[0] = usig;
+        regs->regs[29] = regs->sp - 16;
+        regs->sp = (unsigned long)frame;
+        regs->pc = (unsigned long)ka->sa.sa_handler;
+
+        if (ka->sa.sa_flags & SA_RESTORER)
+                sigtramp = ka->sa.sa_restorer;
+        else
+                sigtramp = VDSO_SYMBOL(current->mm->context.vdso, sigtramp);
+
+        regs->regs[30] = (unsigned long)sigtramp;
+
+        return err;
+}
+
+static int setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
+                          sigset_t *set, struct pt_regs *regs)
+{
+        struct rt_sigframe __user *frame;
+        stack_t stack;
+        int err = 0;
+
+        frame = get_sigframe(ka, regs, sizeof(*frame));
+        if (!frame)
+                return 1;
+
+        __put_user_error(0, &frame->uc.uc_flags, err);
+        __put_user_error(NULL, &frame->uc.uc_link, err);
+
+        memset(&stack, 0, sizeof(stack));
+        stack.ss_sp = (void __user *)current->sas_ss_sp;
+        stack.ss_flags = sas_ss_flags(regs->sp);
+        stack.ss_size = current->sas_ss_size;
+        err |= __copy_to_user(&frame->uc.uc_stack, &stack, sizeof(stack));
+
+        err |= setup_sigframe(frame, regs, set);
+        if (err == 0)
+                err = setup_return(regs, ka, frame, usig);
+
+        if (err == 0 && ka->sa.sa_flags & SA_SIGINFO) {
+                err |= copy_siginfo_to_user(&frame->info, info);
+                regs->regs[1] = (unsigned long)&frame->info;
+                regs->regs[2] = (unsigned long)&frame->uc;
+        }
+
+        return err;
+}
+
+static void setup_restart_syscall(struct pt_regs *regs)
+{
+        if (is_compat_task())
+                compat_setup_restart_syscall(regs);
+        else
+                regs->regs[8] = __NR_restart_syscall;
+}
+
+/*
+ * OK, we're invoking a handler
+ */
+static void handle_signal(unsigned long sig, struct k_sigaction *ka,
+                          siginfo_t *info, struct pt_regs *regs)
+{
+        struct thread_info *thread = current_thread_info();
+        struct task_struct *tsk = current;
+        sigset_t *oldset = sigmask_to_save();
+        int usig = sig;
+        int ret;
+
+        /*
+         * translate the signal
+         */
+        if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap)
+                usig = thread->exec_domain->signal_invmap[usig];
+
+        /*
+         * Set up the stack frame
+         */
+        if (is_compat_task()) {
+                if (ka->sa.sa_flags & SA_SIGINFO)
+                        ret = compat_setup_rt_frame(usig, ka, info, oldset,
+                                                    regs);
+                else
+                        ret = compat_setup_frame(usig, ka, oldset, regs);
+        } else {
+                ret = setup_rt_frame(usig, ka, info, oldset, regs);
+        }
+
+        /*
+         * Check that the resulting registers are actually sane.
+         */
+        ret |= !valid_user_regs(&regs->user_regs);
+
+        if (ret != 0) {
+                force_sigsegv(sig, tsk);
+                return;
+        }
+
+        /*
+         * Fast forward the stepping logic so we step into the signal
+         * handler.
+         */
+        user_fastforward_single_step(tsk);
+
+        signal_delivered(sig, info, ka, regs, 0);
+}
+
+/*
+ * Note that 'init' is a special process: it doesn't get signals it doesn't
+ * want to handle. Thus you cannot kill init even with a SIGKILL even by
+ * mistake.
+ *
+ * Note that we go through the signals twice: once to check the signals that
+ * the kernel can handle, and then we build all the user-level signal handling
+ * stack-frames in one go after that.
+ */
+static void do_signal(struct pt_regs *regs)
+{
+        unsigned long continue_addr = 0, restart_addr = 0;
+        struct k_sigaction ka;
+        siginfo_t info;
+        int signr, retval = 0;
+        int syscall = (int)regs->syscallno;
+
+        /*
+         * If we were from a system call, check for system call restarting...
+         */
+        if (syscall >= 0) {
+                continue_addr = regs->pc;
+                restart_addr = continue_addr - (compat_thumb_mode(regs) ? 2 : 4);
+                retval = regs->regs[0];
+
+                /*
+                 * Avoid additional syscall restarting via ret_to_user.
+                 */
+                regs->syscallno = ~0UL;
+
+                /*
+                 * Prepare for system call restart. We do this here so that a
+                 * debugger will see the already changed PC.
+                 */
+                switch (retval) {
+                case -ERESTARTNOHAND:
+                case -ERESTARTSYS:
+                case -ERESTARTNOINTR:
+                case -ERESTART_RESTARTBLOCK:
+                        regs->regs[0] = regs->orig_x0;
+                        regs->pc = restart_addr;
+                        break;
+                }
+        }
+
+        /*
+         * Get the signal to deliver. When running under ptrace, at this point
+         * the debugger may change all of our registers.
+         */
+        signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+        if (signr > 0) {
+                /*
+                 * Depending on the signal settings, we may need to revert the
+                 * decision to restart the system call, but skip this if a
+                 * debugger has chosen to restart at a different PC.
+                 */
+                if (regs->pc == restart_addr &&
+                    (retval == -ERESTARTNOHAND ||
+                     retval == -ERESTART_RESTARTBLOCK ||
+                     (retval == -ERESTARTSYS &&
+                      !(ka.sa.sa_flags & SA_RESTART)))) {
+                        regs->regs[0] = -EINTR;
+                        regs->pc = continue_addr;
+                }
+
+                handle_signal(signr, &ka, &info, regs);
+                return;
+        }
+
+        /*
+         * Handle restarting a different system call. As above, if a debugger
+         * has chosen to restart at a different PC, ignore the restart.
+         */
+        if (syscall >= 0 && regs->pc == restart_addr) {
+                if (retval == -ERESTART_RESTARTBLOCK)
+                        setup_restart_syscall(regs);
+                user_rewind_single_step(current);
+        }
+
+        restore_saved_sigmask();
+}
+
+asmlinkage void do_notify_resume(struct pt_regs *regs,
+                                 unsigned int thread_flags)
+{
+        if (thread_flags & _TIF_SIGPENDING)
+                do_signal(regs);
+
+        if (thread_flags & _TIF_NOTIFY_RESUME) {
+                clear_thread_flag(TIF_NOTIFY_RESUME);
+                tracehook_notify_resume(regs);
+        }
+}
diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c
new file mode 100644
index 00000000000..ac74c2f261e
--- /dev/null
+++ b/arch/arm64/kernel/signal32.c
@@ -0,0 +1,876 @@
+/*
+ * Based on arch/arm/kernel/signal.c
+ *
+ * Copyright (C) 1995-2009 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ * Modified by Will Deacon <will.deacon@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define __SYSCALL_COMPAT
+
+#include <linux/compat.h>
+#include <linux/signal.h>
+#include <linux/syscalls.h>
+#include <linux/ratelimit.h>
+
+#include <asm/fpsimd.h>
+#include <asm/signal32.h>
+#include <asm/uaccess.h>
+#include <asm/unistd.h>
+
+typedef struct compat_siginfo {
+        int si_signo;
+        int si_errno;
+        int si_code;
+
+        union {
+                /* The padding is the same size as AArch64. */
+                int _pad[SI_PAD_SIZE];
+
+                /* kill() */
+                struct {
+                        compat_pid_t _pid;      /* sender's pid */
+                        __compat_uid32_t _uid;  /* sender's uid */
+                } _kill;
+
+                /* POSIX.1b timers */
+                struct {
+                        compat_timer_t _tid;    /* timer id */
+                        int _overrun;           /* overrun count */
+                        compat_sigval_t _sigval;        /* same as below */
+                        int _sys_private;       /* not to be passed to user */
+                } _timer;
+
+                /* POSIX.1b signals */
+                struct {
+                        compat_pid_t _pid;      /* sender's pid */
+                        __compat_uid32_t _uid;  /* sender's uid */
+                        compat_sigval_t _sigval;
+                } _rt;
+
+                /* SIGCHLD */
+                struct {
+                        compat_pid_t _pid;      /* which child */
+                        __compat_uid32_t _uid;  /* sender's uid */
+                        int _status;            /* exit code */
+                        compat_clock_t _utime;
+                        compat_clock_t _stime;
+                } _sigchld;
+
+                /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
+                struct {
+                        compat_uptr_t _addr; /* faulting insn/memory ref. */
+                        short _addr_lsb; /* LSB of the reported address */
+                } _sigfault;
+
+                /* SIGPOLL */
+                struct {
+                        compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
+                        int _fd;
+                } _sigpoll;
+        } _sifields;
+} compat_siginfo_t;
+
+struct compat_sigaction {
+        compat_uptr_t                   sa_handler;
+        compat_ulong_t                  sa_flags;
+        compat_uptr_t                   sa_restorer;
+        compat_sigset_t                 sa_mask;
+};
+
+struct compat_old_sigaction {
+        compat_uptr_t                   sa_handler;
+        compat_old_sigset_t             sa_mask;
+        compat_ulong_t                  sa_flags;
+        compat_uptr_t                   sa_restorer;
+};
+
+typedef struct compat_sigaltstack {
+        compat_uptr_t                   ss_sp;
+        int                             ss_flags;
+        compat_size_t                   ss_size;
+} compat_stack_t;
+
+struct compat_sigcontext {
+        /* We always set these two fields to 0 */
+        compat_ulong_t                  trap_no;
+        compat_ulong_t                  error_code;
+
+        compat_ulong_t                  oldmask;
+        compat_ulong_t                  arm_r0;
+        compat_ulong_t                  arm_r1;
+        compat_ulong_t                  arm_r2;
+        compat_ulong_t                  arm_r3;
+        compat_ulong_t                  arm_r4;
+        compat_ulong_t                  arm_r5;
+        compat_ulong_t                  arm_r6;
+        compat_ulong_t                  arm_r7;
+        compat_ulong_t                  arm_r8;
+        compat_ulong_t                  arm_r9;
+        compat_ulong_t                  arm_r10;
+        compat_ulong_t                  arm_fp;
+        compat_ulong_t                  arm_ip;
+        compat_ulong_t                  arm_sp;
+        compat_ulong_t                  arm_lr;
+        compat_ulong_t                  arm_pc;
+        compat_ulong_t                  arm_cpsr;
+        compat_ulong_t                  fault_address;
+};
+
+struct compat_ucontext {
+        compat_ulong_t                  uc_flags;
+        struct compat_ucontext          *uc_link;
+        compat_stack_t                  uc_stack;
+        struct compat_sigcontext        uc_mcontext;
+        compat_sigset_t                 uc_sigmask;
+        int             __unused[32 - (sizeof (compat_sigset_t) / sizeof (int))];
+        compat_ulong_t  uc_regspace[128] __attribute__((__aligned__(8)));
+};
+
+struct compat_vfp_sigframe {
+        compat_ulong_t  magic;
+        compat_ulong_t  size;
+        struct compat_user_vfp {
+                compat_u64      fpregs[32];
+                compat_ulong_t  fpscr;
+        } ufp;
+        struct compat_user_vfp_exc {
+                compat_ulong_t  fpexc;
+                compat_ulong_t  fpinst;
+                compat_ulong_t  fpinst2;
+        } ufp_exc;
+} __attribute__((__aligned__(8)));
+
+#define VFP_MAGIC               0x56465001
+#define VFP_STORAGE_SIZE        sizeof(struct compat_vfp_sigframe)
+
+struct compat_aux_sigframe {
+        struct compat_vfp_sigframe      vfp;
+
+        /* Something that isn't a valid magic number for any coprocessor.  */
+        unsigned long                   end_magic;
+} __attribute__((__aligned__(8)));
+
+struct compat_sigframe {
+        struct compat_ucontext  uc;
+        compat_ulong_t          retcode[2];
+};
+
+struct compat_rt_sigframe {
+        struct compat_siginfo info;
+        struct compat_sigframe sig;
+};
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+/*
+ * For ARM syscalls, the syscall number has to be loaded into r7.
+ * We do not support an OABI userspace.
+ */
+#define MOV_R7_NR_SIGRETURN     (0xe3a07000 | __NR_sigreturn)
+#define SVC_SYS_SIGRETURN       (0xef000000 | __NR_sigreturn)
+#define MOV_R7_NR_RT_SIGRETURN  (0xe3a07000 | __NR_rt_sigreturn)
+#define SVC_SYS_RT_SIGRETURN    (0xef000000 | __NR_rt_sigreturn)
+
+/*
+ * For Thumb syscalls, we also pass the syscall number via r7. We therefore
+ * need two 16-bit instructions.
+ */
+#define SVC_THUMB_SIGRETURN     (((0xdf00 | __NR_sigreturn) << 16) | \
+                                   0x2700 | __NR_sigreturn)
+#define SVC_THUMB_RT_SIGRETURN  (((0xdf00 | __NR_rt_sigreturn) << 16) | \
+                                   0x2700 | __NR_rt_sigreturn)
+
+const compat_ulong_t aarch32_sigret_code[6] = {
+        /*
+         * AArch32 sigreturn code.
+         * We don't construct an OABI SWI - instead we just set the imm24 field
+         * to the EABI syscall number so that we create a sane disassembly.
+         */
+        MOV_R7_NR_SIGRETURN,    SVC_SYS_SIGRETURN,    SVC_THUMB_SIGRETURN,
+        MOV_R7_NR_RT_SIGRETURN, SVC_SYS_RT_SIGRETURN, SVC_THUMB_RT_SIGRETURN,
+};
+
+static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
+{
+        compat_sigset_t cset;
+
+        cset.sig[0] = set->sig[0] & 0xffffffffull;
+        cset.sig[1] = set->sig[0] >> 32;
+
+        return copy_to_user(uset, &cset, sizeof(*uset));
+}
+
+static inline int get_sigset_t(sigset_t *set,
+                               const compat_sigset_t __user *uset)
+{
+        compat_sigset_t s32;
+
+        if (copy_from_user(&s32, uset, sizeof(*uset)))
+                return -EFAULT;
+
+        set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
+        return 0;
+}
+
+int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
+{
+        int err;
+
+        if (!access_ok(VERIFY_WRITE, to, sizeof(*to)))
+                return -EFAULT;
+
+        /* If you change siginfo_t structure, please be sure
+         * this code is fixed accordingly.
+         * It should never copy any pad contained in the structure
+         * to avoid security leaks, but must copy the generic
+         * 3 ints plus the relevant union member.
+         * This routine must convert siginfo from 64bit to 32bit as well
+         * at the same time.
+         */
+        err = __put_user(from->si_signo, &to->si_signo);
+        err |= __put_user(from->si_errno, &to->si_errno);
+        err |= __put_user((short)from->si_code, &to->si_code);
+        if (from->si_code < 0)
+                err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad,
+                                      SI_PAD_SIZE);
+        else switch (from->si_code & __SI_MASK) {
+        case __SI_KILL:
+                err |= __put_user(from->si_pid, &to->si_pid);
+                err |= __put_user(from->si_uid, &to->si_uid);
+                break;
+        case __SI_TIMER:
+                 err |= __put_user(from->si_tid, &to->si_tid);
+                 err |= __put_user(from->si_overrun, &to->si_overrun);
+                 err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr,
+                                   &to->si_ptr);
+                break;
+        case __SI_POLL:
+                err |= __put_user(from->si_band, &to->si_band);
+                err |= __put_user(from->si_fd, &to->si_fd);
+                break;
+        case __SI_FAULT:
+                err |= __put_user((compat_uptr_t)(unsigned long)from->si_addr,
+                                  &to->si_addr);
+#ifdef BUS_MCEERR_AO
+                /*
+                 * Other callers might not initialize the si_lsb field,
+                 * so check explicitely for the right codes here.
+                 */
+                if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO)
+                        err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb);
+#endif
+                break;
+        case __SI_CHLD:
+                err |= __put_user(from->si_pid, &to->si_pid);
+                err |= __put_user(from->si_uid, &to->si_uid);
+                err |= __put_user(from->si_status, &to->si_status);
+                err |= __put_user(from->si_utime, &to->si_utime);
+                err |= __put_user(from->si_stime, &to->si_stime);
+                break;
+        case __SI_RT: /* This is not generated by the kernel as of now. */
+        case __SI_MESGQ: /* But this is */
+                err |= __put_user(from->si_pid, &to->si_pid);
+                err |= __put_user(from->si_uid, &to->si_uid);
+                err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, &to->si_ptr);
+                break;
+        default: /* this is just in case for now ... */
+                err |= __put_user(from->si_pid, &to->si_pid);
+                err |= __put_user(from->si_uid, &to->si_uid);
+                break;
+        }
+        return err;
+}
+
+int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
+{
+        memset(to, 0, sizeof *to);
+
+        if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) ||
+            copy_from_user(to->_sifields._pad,
+                           from->_sifields._pad, SI_PAD_SIZE))
+                return -EFAULT;
+
+        return 0;
+}
+
+/*
+ * VFP save/restore code.
+ */
+static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame)
+{
+        struct fpsimd_state *fpsimd = &current->thread.fpsimd_state;
+        compat_ulong_t magic = VFP_MAGIC;
+        compat_ulong_t size = VFP_STORAGE_SIZE;
+        compat_ulong_t fpscr, fpexc;
+        int err = 0;
+
+        /*
+         * Save the hardware registers to the fpsimd_state structure.
+         * Note that this also saves V16-31, which aren't visible
+         * in AArch32.
+         */
+        fpsimd_save_state(fpsimd);
+
+        /* Place structure header on the stack */
+        __put_user_error(magic, &frame->magic, err);
+        __put_user_error(size, &frame->size, err);
+
+        /*
+         * Now copy the FP registers. Since the registers are packed,
+         * we can copy the prefix we want (V0-V15) as it is.
+         * FIXME: Won't work if big endian.
+         */
+        err |= __copy_to_user(&frame->ufp.fpregs, fpsimd->vregs,
+                              sizeof(frame->ufp.fpregs));
+
+        /* Create an AArch32 fpscr from the fpsr and the fpcr. */
+        fpscr = (fpsimd->fpsr & VFP_FPSCR_STAT_MASK) |
+                (fpsimd->fpcr & VFP_FPSCR_CTRL_MASK);
+        __put_user_error(fpscr, &frame->ufp.fpscr, err);
+
+        /*
+         * The exception register aren't available so we fake up a
+         * basic FPEXC and zero everything else.
+         */
+        fpexc = (1 << 30);
+        __put_user_error(fpexc, &frame->ufp_exc.fpexc, err);
+        __put_user_error(0, &frame->ufp_exc.fpinst, err);
+        __put_user_error(0, &frame->ufp_exc.fpinst2, err);
+
+        return err ? -EFAULT : 0;
+}
+
+static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame)
+{
+        struct fpsimd_state fpsimd;
+        compat_ulong_t magic = VFP_MAGIC;
+        compat_ulong_t size = VFP_STORAGE_SIZE;
+        compat_ulong_t fpscr;
+        int err = 0;
+
+        __get_user_error(magic, &frame->magic, err);
+        __get_user_error(size, &frame->size, err);
+
+        if (err)
+                return -EFAULT;
+        if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE)
+                return -EINVAL;
+
+        /*
+         * Copy the FP registers into the start of the fpsimd_state.
+         * FIXME: Won't work if big endian.
+         */
+        err |= __copy_from_user(fpsimd.vregs, frame->ufp.fpregs,
+                                sizeof(frame->ufp.fpregs));
+
+        /* Extract the fpsr and the fpcr from the fpscr */
+        __get_user_error(fpscr, &frame->ufp.fpscr, err);
+        fpsimd.fpsr = fpscr & VFP_FPSCR_STAT_MASK;
+        fpsimd.fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
+
+        /*
+         * We don't need to touch the exception register, so
+         * reload the hardware state.
+         */
+        if (!err) {
+                preempt_disable();
+                fpsimd_load_state(&fpsimd);
+                preempt_enable();
+        }
+
+        return err ? -EFAULT : 0;
+}
+
+/*
+ * atomically swap in the new signal mask, and wait for a signal.
+ */
+asmlinkage int compat_sys_sigsuspend(int restart, compat_ulong_t oldmask,
+                                     compat_old_sigset_t mask)
+{
+        sigset_t blocked;
+
+        siginitset(&current->blocked, mask);
+        return sigsuspend(&blocked);
+}
+
+asmlinkage int compat_sys_sigaction(int sig,
+                                    const struct compat_old_sigaction __user *act,
+                                    struct compat_old_sigaction __user *oact)
+{
+        struct k_sigaction new_ka, old_ka;
+        int ret;
+        compat_old_sigset_t mask;
+        compat_uptr_t handler, restorer;
+
+        if (act) {
+                if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
+                    __get_user(handler, &act->sa_handler) ||
+                    __get_user(restorer, &act->sa_restorer) ||
+                    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
+                    __get_user(mask, &act->sa_mask))
+                        return -EFAULT;
+
+                new_ka.sa.sa_handler = compat_ptr(handler);
+                new_ka.sa.sa_restorer = compat_ptr(restorer);
+                siginitset(&new_ka.sa.sa_mask, mask);
+        }
+
+        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+
+        if (!ret && oact) {
+                if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
+                    __put_user(ptr_to_compat(old_ka.sa.sa_handler),
+                               &oact->sa_handler) ||
+                    __put_user(ptr_to_compat(old_ka.sa.sa_restorer),
+                               &oact->sa_restorer) ||
+                    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
+                    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
+                        return -EFAULT;
+        }
+
+        return ret;
+}
+
+asmlinkage int compat_sys_rt_sigaction(int sig,
+                                       const struct compat_sigaction __user *act,
+                                       struct compat_sigaction __user *oact,
+                                       compat_size_t sigsetsize)
+{
+        struct k_sigaction new_ka, old_ka;
+        int ret;
+
+        /* XXX: Don't preclude handling different sized sigset_t's.  */
+        if (sigsetsize != sizeof(compat_sigset_t))
+                return -EINVAL;
+
+        if (act) {
+                compat_uptr_t handler, restorer;
+
+                ret = get_user(handler, &act->sa_handler);
+                new_ka.sa.sa_handler = compat_ptr(handler);
+                ret |= get_user(restorer, &act->sa_restorer);
+                new_ka.sa.sa_restorer = compat_ptr(restorer);
+                ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask);
+                ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
+                if (ret)
+                        return -EFAULT;
+        }
+
+        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+        if (!ret && oact) {
+                ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
+                ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask);
+                ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
+        }
+        return ret;
+}
+
+int compat_do_sigaltstack(compat_uptr_t compat_uss, compat_uptr_t compat_uoss,
+                          compat_ulong_t sp)
+{
+        compat_stack_t __user *newstack = compat_ptr(compat_uss);
+        compat_stack_t __user *oldstack = compat_ptr(compat_uoss);
+        compat_uptr_t ss_sp;
+        int ret;
+        mm_segment_t old_fs;
+        stack_t uss, uoss;
+
+        /* Marshall the compat new stack into a stack_t */
+        if (newstack) {
+                if (get_user(ss_sp, &newstack->ss_sp) ||
+                    __get_user(uss.ss_flags, &newstack->ss_flags) ||
+                    __get_user(uss.ss_size, &newstack->ss_size))
+                        return -EFAULT;
+                uss.ss_sp = compat_ptr(ss_sp);
+        }
+
+        old_fs = get_fs();
+        set_fs(KERNEL_DS);
+        /* The __user pointer casts are valid because of the set_fs() */
+        ret = do_sigaltstack(
+                newstack ? (stack_t __user *) &uss : NULL,
+                oldstack ? (stack_t __user *) &uoss : NULL,
+                (unsigned long)sp);
+        set_fs(old_fs);
+
+        /* Convert the old stack_t into a compat stack. */
+        if (!ret && oldstack &&
+                (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) ||
+                 __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
+                 __put_user(uoss.ss_size, &oldstack->ss_size)))
+                return -EFAULT;
+        return ret;
+}
+
+static int compat_restore_sigframe(struct pt_regs *regs,
+                                   struct compat_sigframe __user *sf)
+{
+        int err;
+        sigset_t set;
+        struct compat_aux_sigframe __user *aux;
+
+        err = get_sigset_t(&set, &sf->uc.uc_sigmask);
+        if (err == 0) {
+                sigdelsetmask(&set, ~_BLOCKABLE);
+                set_current_blocked(&set);
+        }
+
+        __get_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
+        __get_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
+        __get_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
+        __get_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
+        __get_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
+        __get_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
+        __get_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
+        __get_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
+        __get_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
+        __get_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
+        __get_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
+        __get_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
+        __get_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
+        __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
+        __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
+        __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
+        __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
+
+        /*
+         * Avoid compat_sys_sigreturn() restarting.
+         */
+        regs->syscallno = ~0UL;
+
+        err |= !valid_user_regs(&regs->user_regs);
+
+        aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
+        if (err == 0)
+                err |= compat_restore_vfp_context(&aux->vfp);
+
+        return err;
+}
+
+asmlinkage int compat_sys_sigreturn(struct pt_regs *regs)
+{
+        struct compat_sigframe __user *frame;
+
+        /* Always make any pending restarted system calls return -EINTR */
+        current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+        /*
+         * Since we stacked the signal on a 64-bit boundary,
+         * then 'sp' should be word aligned here.  If it's
+         * not, then the user is trying to mess with us.
+         */
+        if (regs->compat_sp & 7)
+                goto badframe;
+
+        frame = (struct compat_sigframe __user *)regs->compat_sp;
+
+        if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
+                goto badframe;
+
+        if (compat_restore_sigframe(regs, frame))
+                goto badframe;
+
+        return regs->regs[0];
+
+badframe:
+        if (show_unhandled_signals)
+                pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
+                                    current->comm, task_pid_nr(current), __func__,
+                                    regs->pc, regs->sp);
+        force_sig(SIGSEGV, current);
+        return 0;
+}
+
+asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs)
+{
+        struct compat_rt_sigframe __user *frame;
+
+        /* Always make any pending restarted system calls return -EINTR */
+        current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+        /*
+         * Since we stacked the signal on a 64-bit boundary,
+         * then 'sp' should be word aligned here.  If it's
+         * not, then the user is trying to mess with us.
+         */
+        if (regs->compat_sp & 7)
+                goto badframe;
+
+        frame = (struct compat_rt_sigframe __user *)regs->compat_sp;
+
+        if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
+                goto badframe;
+
+        if (compat_restore_sigframe(regs, &frame->sig))
+                goto badframe;
+
+        if (compat_do_sigaltstack(ptr_to_compat(&frame->sig.uc.uc_stack),
+                                 ptr_to_compat((void __user *)NULL),
+                                 regs->compat_sp) == -EFAULT)
+                goto badframe;
+
+        return regs->regs[0];
+
+badframe:
+        if (show_unhandled_signals)
+                pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
+                                    current->comm, task_pid_nr(current), __func__,
+                                    regs->pc, regs->sp);
+        force_sig(SIGSEGV, current);
+        return 0;
+}
+
+static inline void __user *compat_get_sigframe(struct k_sigaction *ka,
+                                               struct pt_regs *regs,
+                                               int framesize)
+{
+        compat_ulong_t sp = regs->compat_sp;
+        void __user *frame;
+
+        /*
+         * This is the X/Open sanctioned signal stack switching.
+         */
+        if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
+                sp = current->sas_ss_sp + current->sas_ss_size;
+
+        /*
+         * ATPCS B01 mandates 8-byte alignment
+         */
+        frame = compat_ptr((compat_uptr_t)((sp - framesize) & ~7));
+
+        /*
+         * Check that we can actually write to the signal frame.
+         */
+        if (!access_ok(VERIFY_WRITE, frame, framesize))
+                frame = NULL;
+
+        return frame;
+}
+
+static int compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka,
+                               compat_ulong_t __user *rc, void __user *frame,
+                               int usig)
+{
+        compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler);
+        compat_ulong_t retcode;
+        compat_ulong_t spsr = regs->pstate & ~PSR_f;
+        int thumb;
+
+        /* Check if the handler is written for ARM or Thumb */
+        thumb = handler & 1;
+
+        if (thumb) {
+                spsr |= COMPAT_PSR_T_BIT;
+                spsr &= ~COMPAT_PSR_IT_MASK;
+        } else {
+                spsr &= ~COMPAT_PSR_T_BIT;
+        }
+
+        if (ka->sa.sa_flags & SA_RESTORER) {
+                retcode = ptr_to_compat(ka->sa.sa_restorer);
+        } else {
+                /* Set up sigreturn pointer */
+                unsigned int idx = thumb << 1;
+
+                if (ka->sa.sa_flags & SA_SIGINFO)
+                        idx += 3;
+
+                retcode = AARCH32_VECTORS_BASE +
+                          AARCH32_KERN_SIGRET_CODE_OFFSET +
+                          (idx << 2) + thumb;
+        }
+
+        regs->regs[0]   = usig;
+        regs->compat_sp = ptr_to_compat(frame);
+        regs->compat_lr = retcode;
+        regs->pc        = handler;
+        regs->pstate    = spsr;
+
+        return 0;
+}
+
+static int compat_setup_sigframe(struct compat_sigframe __user *sf,
+                                 struct pt_regs *regs, sigset_t *set)
+{
+        struct compat_aux_sigframe __user *aux;
+        int err = 0;
+
+        __put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
+        __put_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
+        __put_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
+        __put_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
+        __put_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
+        __put_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
+        __put_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
+        __put_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
+        __put_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
+        __put_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
+        __put_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
+        __put_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
+        __put_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
+        __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
+        __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
+        __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
+        __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
+
+        __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err);
+        __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.error_code, err);
+        __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err);
+        __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err);
+
+        err |= put_sigset_t(&sf->uc.uc_sigmask, set);
+
+        aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
+
+        if (err == 0)
+                err |= compat_preserve_vfp_context(&aux->vfp);
+        __put_user_error(0, &aux->end_magic, err);
+
+        return err;
+}
+
+/*
+ * 32-bit signal handling routines called from signal.c
+ */
+int compat_setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
+                          sigset_t *set, struct pt_regs *regs)
+{
+        struct compat_rt_sigframe __user *frame;
+        compat_stack_t stack;
+        int err = 0;
+
+        frame = compat_get_sigframe(ka, regs, sizeof(*frame));
+
+        if (!frame)
+                return 1;
+
+        err |= copy_siginfo_to_user32(&frame->info, info);
+
+        __put_user_error(0, &frame->sig.uc.uc_flags, err);
+        __put_user_error(NULL, &frame->sig.uc.uc_link, err);
+
+        memset(&stack, 0, sizeof(stack));
+        stack.ss_sp = (compat_uptr_t)current->sas_ss_sp;
+        stack.ss_flags = sas_ss_flags(regs->compat_sp);
+        stack.ss_size = current->sas_ss_size;
+        err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack));
+
+        err |= compat_setup_sigframe(&frame->sig, regs, set);
+        if (err == 0)
+                err = compat_setup_return(regs, ka, frame->sig.retcode, frame,
+                                          usig);
+
+        if (err == 0) {
+                regs->regs[1] = (compat_ulong_t)(unsigned long)&frame->info;
+                regs->regs[2] = (compat_ulong_t)(unsigned long)&frame->sig.uc;
+        }
+
+        return err;
+}
+
+int compat_setup_frame(int usig, struct k_sigaction *ka, sigset_t *set,
+                       struct pt_regs *regs)
+{
+        struct compat_sigframe __user *frame;
+        int err = 0;
+
+        frame = compat_get_sigframe(ka, regs, sizeof(*frame));
+
+        if (!frame)
+                return 1;
+
+        __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err);
+
+        err |= compat_setup_sigframe(frame, regs, set);
+        if (err == 0)
+                err = compat_setup_return(regs, ka, frame->retcode, frame, usig);
+
+        return err;
+}
+
+/*
+ * RT signals don't have generic compat wrappers.
+ * See arch/powerpc/kernel/signal_32.c
+ */
+asmlinkage int compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
+                                         compat_sigset_t __user *oset,
+                                         compat_size_t sigsetsize)
+{
+        sigset_t s;
+        sigset_t __user *up;
+        int ret;
+        mm_segment_t old_fs = get_fs();
+
+        if (set) {
+                if (get_sigset_t(&s, set))
+                        return -EFAULT;
+        }
+
+        set_fs(KERNEL_DS);
+        /* This is valid because of the set_fs() */
+        up = (sigset_t __user *) &s;
+        ret = sys_rt_sigprocmask(how, set ? up : NULL, oset ? up : NULL,
+                                 sigsetsize);
+        set_fs(old_fs);
+        if (ret)
+                return ret;
+        if (oset) {
+                if (put_sigset_t(oset, &s))
+                        return -EFAULT;
+        }
+        return 0;
+}
+
+asmlinkage int compat_sys_rt_sigpending(compat_sigset_t __user *set,
+                                        compat_size_t sigsetsize)
+{
+        sigset_t s;
+        int ret;
+        mm_segment_t old_fs = get_fs();
+
+        set_fs(KERNEL_DS);
+        /* The __user pointer cast is valid because of the set_fs() */
+        ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
+        set_fs(old_fs);
+        if (!ret) {
+                if (put_sigset_t(set, &s))
+                        return -EFAULT;
+        }
+        return ret;
+}
+
+asmlinkage int compat_sys_rt_sigqueueinfo(int pid, int sig,
+                                          compat_siginfo_t __user *uinfo)
+{
+        siginfo_t info;
+        int ret;
+        mm_segment_t old_fs = get_fs();
+
+        ret = copy_siginfo_from_user32(&info, uinfo);
+        if (unlikely(ret))
+                return ret;
+
+        set_fs (KERNEL_DS);
+        /* The __user pointer cast is valid because of the set_fs() */
+        ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info);
+        set_fs (old_fs);
+        return ret;
+}
+
+void compat_setup_restart_syscall(struct pt_regs *regs)
+{
+       regs->regs[7] = __NR_restart_syscall;
+}
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
new file mode 100644
index 00000000000..b711525be21
--- /dev/null
+++ b/arch/arm64/kernel/smp.c
@@ -0,0 +1,469 @@
+/*
+ * SMP initialisation and IPI support
+ * Based on arch/arm/kernel/smp.c
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/cache.h>
+#include <linux/profile.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/err.h>
+#include <linux/cpu.h>
+#include <linux/smp.h>
+#include <linux/seq_file.h>
+#include <linux/irq.h>
+#include <linux/percpu.h>
+#include <linux/clockchips.h>
+#include <linux/completion.h>
+#include <linux/of.h>
+
+#include <asm/atomic.h>
+#include <asm/cacheflush.h>
+#include <asm/cputype.h>
+#include <asm/mmu_context.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/processor.h>
+#include <asm/sections.h>
+#include <asm/tlbflush.h>
+#include <asm/ptrace.h>
+#include <asm/mmu_context.h>
+
+/*
+ * as from 2.5, kernels no longer have an init_tasks structure
+ * so we need some other way of telling a new secondary core
+ * where to place its SVC stack
+ */
+struct secondary_data secondary_data;
+volatile unsigned long secondary_holding_pen_release = -1;
+
+enum ipi_msg_type {
+        IPI_RESCHEDULE,
+        IPI_CALL_FUNC,
+        IPI_CALL_FUNC_SINGLE,
+        IPI_CPU_STOP,
+};
+
+static DEFINE_RAW_SPINLOCK(boot_lock);
+
+/*
+ * Write secondary_holding_pen_release in a way that is guaranteed to be
+ * visible to all observers, irrespective of whether they're taking part
+ * in coherency or not.  This is necessary for the hotplug code to work
+ * reliably.
+ */
+static void __cpuinit write_pen_release(int val)
+{
+        void *start = (void *)&secondary_holding_pen_release;
+        unsigned long size = sizeof(secondary_holding_pen_release);
+
+        secondary_holding_pen_release = val;
+        __flush_dcache_area(start, size);
+}
+
+/*
+ * Boot a secondary CPU, and assign it the specified idle task.
+ * This also gives us the initial stack to use for this CPU.
+ */
+static int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+        unsigned long timeout;
+
+        /*
+         * Set synchronisation state between this boot processor
+         * and the secondary one
+         */
+        raw_spin_lock(&boot_lock);
+
+        /*
+         * Update the pen release flag.
+         */
+        write_pen_release(cpu);
+
+        /*
+         * Send an event, causing the secondaries to read pen_release.
+         */
+        sev();
+
+        timeout = jiffies + (1 * HZ);
+        while (time_before(jiffies, timeout)) {
+                if (secondary_holding_pen_release == -1UL)
+                        break;
+                udelay(10);
+        }
+
+        /*
+         * Now the secondary core is starting up let it run its
+         * calibrations, then wait for it to finish
+         */
+        raw_spin_unlock(&boot_lock);
+
+        return secondary_holding_pen_release != -1 ? -ENOSYS : 0;
+}
+
+static DECLARE_COMPLETION(cpu_running);
+
+int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *idle)
+{
+        int ret;
+
+        /*
+         * We need to tell the secondary core where to find its stack and the
+         * page tables.
+         */
+        secondary_data.stack = task_stack_page(idle) + THREAD_START_SP;
+        __flush_dcache_area(&secondary_data, sizeof(secondary_data));
+
+        /*
+         * Now bring the CPU into our world.
+         */
+        ret = boot_secondary(cpu, idle);
+        if (ret == 0) {
+                /*
+                 * CPU was successfully started, wait for it to come online or
+                 * time out.
+                 */
+                wait_for_completion_timeout(&cpu_running,
+                                            msecs_to_jiffies(1000));
+
+                if (!cpu_online(cpu)) {
+                        pr_crit("CPU%u: failed to come online\n", cpu);
+                        ret = -EIO;
+                }
+        } else {
+                pr_err("CPU%u: failed to boot: %d\n", cpu, ret);
+        }
+
+        secondary_data.stack = NULL;
+
+        return ret;
+}
+
+/*
+ * This is the secondary CPU boot entry.  We're using this CPUs
+ * idle thread stack, but a set of temporary page tables.
+ */
+asmlinkage void __cpuinit secondary_start_kernel(void)
+{
+        struct mm_struct *mm = &init_mm;
+        unsigned int cpu = smp_processor_id();
+
+        printk("CPU%u: Booted secondary processor\n", cpu);
+
+        /*
+         * All kernel threads share the same mm context; grab a
+         * reference and switch to it.
+         */
+        atomic_inc(&mm->mm_count);
+        current->active_mm = mm;
+        cpumask_set_cpu(cpu, mm_cpumask(mm));
+
+        /*
+         * TTBR0 is only used for the identity mapping at this stage. Make it
+         * point to zero page to avoid speculatively fetching new entries.
+         */
+        cpu_set_reserved_ttbr0();
+        flush_tlb_all();
+
+        preempt_disable();
+        trace_hardirqs_off();
+
+        /*
+         * Let the primary processor know we're out of the
+         * pen, then head off into the C entry point
+         */
+        write_pen_release(-1);
+
+        /*
+         * Synchronise with the boot thread.
+         */
+        raw_spin_lock(&boot_lock);
+        raw_spin_unlock(&boot_lock);
+
+        /*
+         * Enable local interrupts.
+         */
+        notify_cpu_starting(cpu);
+        local_irq_enable();
+        local_fiq_enable();
+
+        /*
+         * OK, now it's safe to let the boot CPU continue.  Wait for
+         * the CPU migration code to notice that the CPU is online
+         * before we continue.
+         */
+        set_cpu_online(cpu, true);
+        while (!cpu_active(cpu))
+                cpu_relax();
+
+        /*
+         * OK, it's off to the idle thread for us
+         */
+        cpu_idle();
+}
+
+void __init smp_cpus_done(unsigned int max_cpus)
+{
+        unsigned long bogosum = loops_per_jiffy * num_online_cpus();
+
+        pr_info("SMP: Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
+                num_online_cpus(), bogosum / (500000/HZ),
+                (bogosum / (5000/HZ)) % 100);
+}
+
+void __init smp_prepare_boot_cpu(void)
+{
+}
+
+static void (*smp_cross_call)(const struct cpumask *, unsigned int);
+static phys_addr_t cpu_release_addr[NR_CPUS];
+
+/*
+ * Enumerate the possible CPU set from the device tree.
+ */
+void __init smp_init_cpus(void)
+{
+        const char *enable_method;
+        struct device_node *dn = NULL;
+        int cpu = 0;
+
+        while ((dn = of_find_node_by_type(dn, "cpu"))) {
+                if (cpu >= NR_CPUS)
+                        goto next;
+
+                /*
+                 * We currently support only the "spin-table" enable-method.
+                 */
+                enable_method = of_get_property(dn, "enable-method", NULL);
+                if (!enable_method || strcmp(enable_method, "spin-table")) {
+                        pr_err("CPU %d: missing or invalid enable-method property: %s\n",
+                               cpu, enable_method);
+                        goto next;
+                }
+
+                /*
+                 * Determine the address from which the CPU is polling.
+                 */
+                if (of_property_read_u64(dn, "cpu-release-addr",
+                                         &cpu_release_addr[cpu])) {
+                        pr_err("CPU %d: missing or invalid cpu-release-addr property\n",
+                               cpu);
+                        goto next;
+                }
+
+                set_cpu_possible(cpu, true);
+next:
+                cpu++;
+        }
+
+        /* sanity check */
+        if (cpu > NR_CPUS)
+                pr_warning("no. of cores (%d) greater than configured maximum of %d - clipping\n",
+                           cpu, NR_CPUS);
+}
+
+void __init smp_prepare_cpus(unsigned int max_cpus)
+{
+        int cpu;
+        void **release_addr;
+        unsigned int ncores = num_possible_cpus();
+
+        /*
+         * are we trying to boot more cores than exist?
+         */
+        if (max_cpus > ncores)
+                max_cpus = ncores;
+
+        /*
+         * Initialise the present map (which describes the set of CPUs
+         * actually populated at the present time) and release the
+         * secondaries from the bootloader.
+         */
+        for_each_possible_cpu(cpu) {
+                if (max_cpus == 0)
+                        break;
+
+                if (!cpu_release_addr[cpu])
+                        continue;
+
+                release_addr = __va(cpu_release_addr[cpu]);
+                release_addr[0] = (void *)__pa(secondary_holding_pen);
+                __flush_dcache_area(release_addr, sizeof(release_addr[0]));
+
+                set_cpu_present(cpu, true);
+                max_cpus--;
+        }
+
+        /*
+         * Send an event to wake up the secondaries.
+         */
+        sev();
+}
+
+
+void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int))
+{
+        smp_cross_call = fn;
+}
+
+void arch_send_call_function_ipi_mask(const struct cpumask *mask)
+{
+        smp_cross_call(mask, IPI_CALL_FUNC);
+}
+
+void arch_send_call_function_single_ipi(int cpu)
+{
+        smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
+}
+
+static const char *ipi_types[NR_IPI] = {
+#define S(x,s)  [x - IPI_RESCHEDULE] = s
+        S(IPI_RESCHEDULE, "Rescheduling interrupts"),
+        S(IPI_CALL_FUNC, "Function call interrupts"),
+        S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"),
+        S(IPI_CPU_STOP, "CPU stop interrupts"),
+};
+
+void show_ipi_list(struct seq_file *p, int prec)
+{
+        unsigned int cpu, i;
+
+        for (i = 0; i < NR_IPI; i++) {
+                seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i + IPI_RESCHEDULE,
+                           prec >= 4 ? " " : "");
+                for_each_present_cpu(cpu)
+                        seq_printf(p, "%10u ",
+                                   __get_irq_stat(cpu, ipi_irqs[i]));
+                seq_printf(p, "      %s\n", ipi_types[i]);
+        }
+}
+
+u64 smp_irq_stat_cpu(unsigned int cpu)
+{
+        u64 sum = 0;
+        int i;
+
+        for (i = 0; i < NR_IPI; i++)
+                sum += __get_irq_stat(cpu, ipi_irqs[i]);
+
+        return sum;
+}
+
+static DEFINE_RAW_SPINLOCK(stop_lock);
+
+/*
+ * ipi_cpu_stop - handle IPI from smp_send_stop()
+ */
+static void ipi_cpu_stop(unsigned int cpu)
+{
+        if (system_state == SYSTEM_BOOTING ||
+            system_state == SYSTEM_RUNNING) {
+                raw_spin_lock(&stop_lock);
+                pr_crit("CPU%u: stopping\n", cpu);
+                dump_stack();
+                raw_spin_unlock(&stop_lock);
+        }
+
+        set_cpu_online(cpu, false);
+
+        local_fiq_disable();
+        local_irq_disable();
+
+        while (1)
+                cpu_relax();
+}
+
+/*
+ * Main handler for inter-processor interrupts
+ */
+void handle_IPI(int ipinr, struct pt_regs *regs)
+{
+        unsigned int cpu = smp_processor_id();
+        struct pt_regs *old_regs = set_irq_regs(regs);
+
+        if (ipinr >= IPI_RESCHEDULE && ipinr < IPI_RESCHEDULE + NR_IPI)
+                __inc_irq_stat(cpu, ipi_irqs[ipinr - IPI_RESCHEDULE]);
+
+        switch (ipinr) {
+        case IPI_RESCHEDULE:
+                scheduler_ipi();
+                break;
+
+        case IPI_CALL_FUNC:
+                irq_enter();
+                generic_smp_call_function_interrupt();
+                irq_exit();
+                break;
+
+        case IPI_CALL_FUNC_SINGLE:
+                irq_enter();
+                generic_smp_call_function_single_interrupt();
+                irq_exit();
+                break;
+
+        case IPI_CPU_STOP:
+                irq_enter();
+                ipi_cpu_stop(cpu);
+                irq_exit();
+                break;
+
+        default:
+                pr_crit("CPU%u: Unknown IPI message 0x%x\n", cpu, ipinr);
+                break;
+        }
+        set_irq_regs(old_regs);
+}
+
+void smp_send_reschedule(int cpu)
+{
+        smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE);
+}
+
+void smp_send_stop(void)
+{
+        unsigned long timeout;
+
+        if (num_online_cpus() > 1) {
+                cpumask_t mask;
+
+                cpumask_copy(&mask, cpu_online_mask);
+                cpu_clear(smp_processor_id(), mask);
+
+                smp_cross_call(&mask, IPI_CPU_STOP);
+        }
+
+        /* Wait up to one second for other CPUs to stop */
+        timeout = USEC_PER_SEC;
+        while (num_online_cpus() > 1 && timeout--)
+                udelay(1);
+
+        if (num_online_cpus() > 1)
+                pr_warning("SMP: failed to stop secondary CPUs\n");
+}
+
+/*
+ * not supported here
+ */
+int setup_profiling_timer(unsigned int multiplier)
+{
+        return -EINVAL;
+}
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
new file mode 100644
index 00000000000..d25459ff57f
--- /dev/null
+++ b/arch/arm64/kernel/stacktrace.c
@@ -0,0 +1,127 @@
+/*
+ * Stack tracing support
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+
+#include <asm/stacktrace.h>
+
+/*
+ * AArch64 PCS assigns the frame pointer to x29.
+ *
+ * A simple function prologue looks like this:
+ *      sub     sp, sp, #0x10
+ *      stp     x29, x30, [sp]
+ *      mov     x29, sp
+ *
+ * A simple function epilogue looks like this:
+ *      mov     sp, x29
+ *      ldp     x29, x30, [sp]
+ *      add     sp, sp, #0x10
+ */
+int unwind_frame(struct stackframe *frame)
+{
+        unsigned long high, low;
+        unsigned long fp = frame->fp;
+
+        low  = frame->sp;
+        high = ALIGN(low, THREAD_SIZE);
+
+        if (fp < low || fp > high || fp & 0xf)
+                return -EINVAL;
+
+        frame->sp = fp + 0x10;
+        frame->fp = *(unsigned long *)(fp);
+        frame->pc = *(unsigned long *)(fp + 8);
+
+        return 0;
+}
+
+void notrace walk_stackframe(struct stackframe *frame,
+                     int (*fn)(struct stackframe *, void *), void *data)
+{
+        while (1) {
+                int ret;
+
+                if (fn(frame, data))
+                        break;
+                ret = unwind_frame(frame);
+                if (ret < 0)
+                        break;
+        }
+}
+EXPORT_SYMBOL(walk_stackframe);
+
+#ifdef CONFIG_STACKTRACE
+struct stack_trace_data {
+        struct stack_trace *trace;
+        unsigned int no_sched_functions;
+        unsigned int skip;
+};
+
+static int save_trace(struct stackframe *frame, void *d)
+{
+        struct stack_trace_data *data = d;
+        struct stack_trace *trace = data->trace;
+        unsigned long addr = frame->pc;
+
+        if (data->no_sched_functions && in_sched_functions(addr))
+                return 0;
+        if (data->skip) {
+                data->skip--;
+                return 0;
+        }
+
+        trace->entries[trace->nr_entries++] = addr;
+
+        return trace->nr_entries >= trace->max_entries;
+}
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+        struct stack_trace_data data;
+        struct stackframe frame;
+
+        data.trace = trace;
+        data.skip = trace->skip;
+
+        if (tsk != current) {
+                data.no_sched_functions = 1;
+                frame.fp = thread_saved_fp(tsk);
+                frame.sp = thread_saved_sp(tsk);
+                frame.pc = thread_saved_pc(tsk);
+        } else {
+                register unsigned long current_sp asm("sp");
+                data.no_sched_functions = 0;
+                frame.fp = (unsigned long)__builtin_frame_address(0);
+                frame.sp = current_sp;
+                frame.pc = (unsigned long)save_stack_trace_tsk;
+        }
+
+        walk_stackframe(&frame, save_trace, &data);
+        if (trace->nr_entries < trace->max_entries)
+                trace->entries[trace->nr_entries++] = ULONG_MAX;
+}
+
+void save_stack_trace(struct stack_trace *trace)
+{
+        save_stack_trace_tsk(current, trace);
+}
+EXPORT_SYMBOL_GPL(save_stack_trace);
+#endif
diff --git a/arch/arm64/kernel/sys.c b/arch/arm64/kernel/sys.c
new file mode 100644
index 00000000000..905fcfb0ddd
--- /dev/null
+++ b/arch/arm64/kernel/sys.c
@@ -0,0 +1,138 @@
+/*
+ * AArch64-specific system calls implementation
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/compiler.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/syscalls.h>
+
+/*
+ * Clone a task - this clones the calling program thread.
+ */
+asmlinkage long sys_clone(unsigned long clone_flags, unsigned long newsp,
+                          int __user *parent_tidptr, unsigned long tls_val,
+                          int __user *child_tidptr, struct pt_regs *regs)
+{
+        if (!newsp)
+                newsp = regs->sp;
+        /* 16-byte aligned stack mandatory on AArch64 */
+        if (newsp & 15)
+                return -EINVAL;
+        return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
+}
+
+/*
+ * sys_execve() executes a new program.
+ */
+asmlinkage long sys_execve(const char __user *filenamei,
+                           const char __user *const __user *argv,
+                           const char __user *const __user *envp,
+                           struct pt_regs *regs)
+{
+        long error;
+        char * filename;
+
+        filename = getname(filenamei);
+        error = PTR_ERR(filename);
+        if (IS_ERR(filename))
+                goto out;
+        error = do_execve(filename, argv, envp, regs);
+        putname(filename);
+out:
+        return error;
+}
+
+int kernel_execve(const char *filename,
+                  const char *const argv[],
+                  const char *const envp[])
+{
+        struct pt_regs regs;
+        int ret;
+
+        memset(&regs, 0, sizeof(struct pt_regs));
+        ret = do_execve(filename,
+                        (const char __user *const __user *)argv,
+                        (const char __user *const __user *)envp, &regs);
+        if (ret < 0)
+                goto out;
+
+        /*
+         * Save argc to the register structure for userspace.
+         */
+        regs.regs[0] = ret;
+
+        /*
+         * We were successful.  We won't be returning to our caller, but
+         * instead to user space by manipulating the kernel stack.
+         */
+        asm(    "add    x0, %0, %1\n\t"
+                "mov    x1, %2\n\t"
+                "mov    x2, %3\n\t"
+                "bl     memmove\n\t"    /* copy regs to top of stack */
+                "mov    x27, #0\n\t"    /* not a syscall */
+                "mov    x28, %0\n\t"    /* thread structure */
+                "mov    sp, x0\n\t"     /* reposition stack pointer */
+                "b      ret_to_user"
+                :
+                : "r" (current_thread_info()),
+                  "Ir" (THREAD_START_SP - sizeof(regs)),
+                  "r" (&regs),
+                  "Ir" (sizeof(regs))
+                : "x0", "x1", "x2", "x27", "x28", "x30", "memory");
+
+ out:
+        return ret;
+}
+EXPORT_SYMBOL(kernel_execve);
+
+asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
+                         unsigned long prot, unsigned long flags,
+                         unsigned long fd, off_t off)
+{
+        if (offset_in_page(off) != 0)
+                return -EINVAL;
+
+        return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
+}
+
+/*
+ * Wrappers to pass the pt_regs argument.
+ */
+#define sys_execve              sys_execve_wrapper
+#define sys_clone               sys_clone_wrapper
+#define sys_rt_sigreturn        sys_rt_sigreturn_wrapper
+#define sys_sigaltstack         sys_sigaltstack_wrapper
+
+#include <asm/syscalls.h>
+
+#undef __SYSCALL
+#define __SYSCALL(nr, sym)      [nr] = sym,
+
+/*
+ * The sys_call_table array must be 4K aligned to be accessible from
+ * kernel/entry.S.
+ */
+void *sys_call_table[__NR_syscalls] __aligned(4096) = {
+        [0 ... __NR_syscalls - 1] = sys_ni_syscall,
+#include <asm/unistd.h>
+};
diff --git a/arch/arm64/kernel/sys32.S b/arch/arm64/kernel/sys32.S
new file mode 100644
index 00000000000..5e4dc93cc31
--- /dev/null
+++ b/arch/arm64/kernel/sys32.S
@@ -0,0 +1,282 @@
+/*
+ * Compat system call wrappers
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Authors: Will Deacon <will.deacon@arm.com>
+ *          Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/assembler.h>
+#include <asm/asm-offsets.h>
+
+/*
+ * System call wrappers for the AArch32 compatibility layer.
+ */
+compat_sys_fork_wrapper:
+        mov     x0, sp
+        b       compat_sys_fork
+ENDPROC(compat_sys_fork_wrapper)
+
+compat_sys_vfork_wrapper:
+        mov     x0, sp
+        b       compat_sys_vfork
+ENDPROC(compat_sys_vfork_wrapper)
+
+compat_sys_execve_wrapper:
+        mov     x3, sp
+        b       compat_sys_execve
+ENDPROC(compat_sys_execve_wrapper)
+
+compat_sys_clone_wrapper:
+        mov     x5, sp
+        b       compat_sys_clone
+ENDPROC(compat_sys_clone_wrapper)
+
+compat_sys_sigreturn_wrapper:
+        mov     x0, sp
+        mov     x27, #0         // prevent syscall restart handling (why)
+        b       compat_sys_sigreturn
+ENDPROC(compat_sys_sigreturn_wrapper)
+
+compat_sys_rt_sigreturn_wrapper:
+        mov     x0, sp
+        mov     x27, #0         // prevent syscall restart handling (why)
+        b       compat_sys_rt_sigreturn
+ENDPROC(compat_sys_rt_sigreturn_wrapper)
+
+compat_sys_sigaltstack_wrapper:
+        ldr     x2, [sp, #S_COMPAT_SP]
+        b       compat_do_sigaltstack
+ENDPROC(compat_sys_sigaltstack_wrapper)
+
+compat_sys_statfs64_wrapper:
+        mov     w3, #84
+        cmp     w1, #88
+        csel    w1, w3, w1, eq
+        b       compat_sys_statfs64
+ENDPROC(compat_sys_statfs64_wrapper)
+
+compat_sys_fstatfs64_wrapper:
+        mov     w3, #84
+        cmp     w1, #88
+        csel    w1, w3, w1, eq
+        b       compat_sys_fstatfs64
+ENDPROC(compat_sys_fstatfs64_wrapper)
+
+/*
+ * Wrappers for AArch32 syscalls that either take 64-bit parameters
+ * in registers or that take 32-bit parameters which require sign
+ * extension.
+ */
+compat_sys_lseek_wrapper:
+        sxtw    x1, w1
+        b       sys_lseek
+ENDPROC(compat_sys_lseek_wrapper)
+
+compat_sys_pread64_wrapper:
+        orr     x3, x4, x5, lsl #32
+        b       sys_pread64
+ENDPROC(compat_sys_pread64_wrapper)
+
+compat_sys_pwrite64_wrapper:
+        orr     x3, x4, x5, lsl #32
+        b       sys_pwrite64
+ENDPROC(compat_sys_pwrite64_wrapper)
+
+compat_sys_truncate64_wrapper:
+        orr     x1, x2, x3, lsl #32
+        b       sys_truncate
+ENDPROC(compat_sys_truncate64_wrapper)
+
+compat_sys_ftruncate64_wrapper:
+        orr     x1, x2, x3, lsl #32
+        b       sys_ftruncate
+ENDPROC(compat_sys_ftruncate64_wrapper)
+
+compat_sys_readahead_wrapper:
+        orr     x1, x2, x3, lsl #32
+        mov     w2, w4
+        b       sys_readahead
+ENDPROC(compat_sys_readahead_wrapper)
+
+compat_sys_lookup_dcookie:
+        orr     x0, x0, x1, lsl #32
+        mov     w1, w2
+        mov     w2, w3
+        b       sys_lookup_dcookie
+ENDPROC(compat_sys_lookup_dcookie)
+
+compat_sys_fadvise64_64_wrapper:
+        mov     w6, w1
+        orr     x1, x2, x3, lsl #32
+        orr     x2, x4, x5, lsl #32
+        mov     w3, w6
+        b       sys_fadvise64_64
+ENDPROC(compat_sys_fadvise64_64_wrapper)
+
+compat_sys_sync_file_range2_wrapper:
+        orr     x2, x2, x3, lsl #32
+        orr     x3, x4, x5, lsl #32
+        b       sys_sync_file_range2
+ENDPROC(compat_sys_sync_file_range2_wrapper)
+
+compat_sys_fallocate_wrapper:
+        orr     x2, x2, x3, lsl #32
+        orr     x3, x4, x5, lsl #32
+        b       sys_fallocate
+ENDPROC(compat_sys_fallocate_wrapper)
+
+compat_sys_fanotify_mark_wrapper:
+        orr     x2, x2, x3, lsl #32
+        mov     w3, w4
+        mov     w4, w5
+        b       sys_fanotify_mark
+ENDPROC(compat_sys_fanotify_mark_wrapper)
+
+/*
+ * Use the compat system call wrappers.
+ */
+#define sys_fork                compat_sys_fork_wrapper
+#define sys_open                compat_sys_open
+#define sys_execve              compat_sys_execve_wrapper
+#define sys_lseek               compat_sys_lseek_wrapper
+#define sys_mount               compat_sys_mount
+#define sys_ptrace              compat_sys_ptrace
+#define sys_times               compat_sys_times
+#define sys_ioctl               compat_sys_ioctl
+#define sys_fcntl               compat_sys_fcntl
+#define sys_ustat               compat_sys_ustat
+#define sys_sigaction           compat_sys_sigaction
+#define sys_sigsuspend          compat_sys_sigsuspend
+#define sys_sigpending          compat_sys_sigpending
+#define sys_setrlimit           compat_sys_setrlimit
+#define sys_getrusage           compat_sys_getrusage
+#define sys_gettimeofday        compat_sys_gettimeofday
+#define sys_settimeofday        compat_sys_settimeofday
+#define sys_statfs              compat_sys_statfs
+#define sys_fstatfs             compat_sys_fstatfs
+#define sys_setitimer           compat_sys_setitimer
+#define sys_getitimer           compat_sys_getitimer
+#define sys_newstat             compat_sys_newstat
+#define sys_newlstat            compat_sys_newlstat
+#define sys_newfstat            compat_sys_newfstat
+#define sys_wait4               compat_sys_wait4
+#define sys_sysinfo             compat_sys_sysinfo
+#define sys_sigreturn           compat_sys_sigreturn_wrapper
+#define sys_clone               compat_sys_clone_wrapper
+#define sys_adjtimex            compat_sys_adjtimex
+#define sys_sigprocmask         compat_sys_sigprocmask
+#define sys_getdents            compat_sys_getdents
+#define sys_select              compat_sys_select
+#define sys_readv               compat_sys_readv
+#define sys_writev              compat_sys_writev
+#define sys_sysctl              compat_sys_sysctl
+#define sys_sched_rr_get_interval compat_sys_sched_rr_get_interval
+#define sys_nanosleep           compat_sys_nanosleep
+#define sys_rt_sigreturn        compat_sys_rt_sigreturn_wrapper
+#define sys_rt_sigaction        compat_sys_rt_sigaction
+#define sys_rt_sigprocmask      compat_sys_rt_sigprocmask
+#define sys_rt_sigpending       compat_sys_rt_sigpending
+#define sys_rt_sigtimedwait     compat_sys_rt_sigtimedwait
+#define sys_rt_sigqueueinfo     compat_sys_rt_sigqueueinfo
+#define sys_rt_sigsuspend       compat_sys_rt_sigsuspend
+#define sys_pread64             compat_sys_pread64_wrapper
+#define sys_pwrite64            compat_sys_pwrite64_wrapper
+#define sys_sigaltstack         compat_sys_sigaltstack_wrapper
+#define sys_sendfile            compat_sys_sendfile
+#define sys_vfork               compat_sys_vfork_wrapper
+#define sys_getrlimit           compat_sys_getrlimit
+#define sys_mmap2               sys_mmap_pgoff
+#define sys_truncate64          compat_sys_truncate64_wrapper
+#define sys_ftruncate64         compat_sys_ftruncate64_wrapper
+#define sys_getdents64          compat_sys_getdents64
+#define sys_fcntl64             compat_sys_fcntl64
+#define sys_readahead           compat_sys_readahead_wrapper
+#define sys_futex               compat_sys_futex
+#define sys_sched_setaffinity   compat_sys_sched_setaffinity
+#define sys_sched_getaffinity   compat_sys_sched_getaffinity
+#define sys_io_setup            compat_sys_io_setup
+#define sys_io_getevents        compat_sys_io_getevents
+#define sys_io_submit           compat_sys_io_submit
+#define sys_lookup_dcookie      compat_sys_lookup_dcookie
+#define sys_timer_create        compat_sys_timer_create
+#define sys_timer_settime       compat_sys_timer_settime
+#define sys_timer_gettime       compat_sys_timer_gettime
+#define sys_clock_settime       compat_sys_clock_settime
+#define sys_clock_gettime       compat_sys_clock_gettime
+#define sys_clock_getres        compat_sys_clock_getres
+#define sys_clock_nanosleep     compat_sys_clock_nanosleep
+#define sys_statfs64            compat_sys_statfs64_wrapper
+#define sys_fstatfs64           compat_sys_fstatfs64_wrapper
+#define sys_utimes              compat_sys_utimes
+#define sys_fadvise64_64        compat_sys_fadvise64_64_wrapper
+#define sys_mq_open             compat_sys_mq_open
+#define sys_mq_timedsend        compat_sys_mq_timedsend
+#define sys_mq_timedreceive     compat_sys_mq_timedreceive
+#define sys_mq_notify           compat_sys_mq_notify
+#define sys_mq_getsetattr       compat_sys_mq_getsetattr
+#define sys_waitid              compat_sys_waitid
+#define sys_recv                compat_sys_recv
+#define sys_recvfrom            compat_sys_recvfrom
+#define sys_setsockopt          compat_sys_setsockopt
+#define sys_getsockopt          compat_sys_getsockopt
+#define sys_sendmsg             compat_sys_sendmsg
+#define sys_recvmsg             compat_sys_recvmsg
+#define sys_semctl              compat_sys_semctl
+#define sys_msgsnd              compat_sys_msgsnd
+#define sys_msgrcv              compat_sys_msgrcv
+#define sys_msgctl              compat_sys_msgctl
+#define sys_shmat               compat_sys_shmat
+#define sys_shmctl              compat_sys_shmctl
+#define sys_keyctl              compat_sys_keyctl
+#define sys_semtimedop          compat_sys_semtimedop
+#define sys_mbind               compat_sys_mbind
+#define sys_get_mempolicy       compat_sys_get_mempolicy
+#define sys_set_mempolicy       compat_sys_set_mempolicy
+#define sys_openat              compat_sys_openat
+#define sys_futimesat           compat_sys_futimesat
+#define sys_pselect6            compat_sys_pselect6
+#define sys_ppoll               compat_sys_ppoll
+#define sys_set_robust_list     compat_sys_set_robust_list
+#define sys_get_robust_list     compat_sys_get_robust_list
+#define sys_sync_file_range2    compat_sys_sync_file_range2_wrapper
+#define sys_vmsplice            compat_sys_vmsplice
+#define sys_move_pages          compat_sys_move_pages
+#define sys_epoll_pwait         compat_sys_epoll_pwait
+#define sys_kexec_load          compat_sys_kexec_load
+#define sys_utimensat           compat_sys_utimensat
+#define sys_signalfd            compat_sys_signalfd
+#define sys_fallocate           compat_sys_fallocate_wrapper
+#define sys_timerfd_settime     compat_sys_timerfd_settime
+#define sys_timerfd_gettime     compat_sys_timerfd_gettime
+#define sys_signalfd4           compat_sys_signalfd4
+#define sys_preadv              compat_sys_preadv
+#define sys_pwritev             compat_sys_pwritev
+#define sys_rt_tgsigqueueinfo   compat_sys_rt_tgsigqueueinfo
+#define sys_recvmmsg            compat_sys_recvmmsg
+#define sys_fanotify_mark       compat_sys_fanotify_mark_wrapper
+
+#undef __SYSCALL
+#define __SYSCALL(x, y)         .quad   y       // x
+#define __SYSCALL_COMPAT
+
+/*
+ * The system calls table must be 4KB aligned.
+ */
+        .align  12
+ENTRY(compat_sys_call_table)
+#include <asm/unistd.h>
diff --git a/arch/arm64/kernel/sys_compat.c b/arch/arm64/kernel/sys_compat.c
new file mode 100644
index 00000000000..967e92fdff0
--- /dev/null
+++ b/arch/arm64/kernel/sys_compat.c
@@ -0,0 +1,164 @@
+/*
+ * Based on arch/arm/kernel/sys_arm.c
+ *
+ * Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
+ * Copyright (C) 1995, 1996 Russell King.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define __SYSCALL_COMPAT
+
+#include <linux/compat.h>
+#include <linux/personality.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+
+#include <asm/cacheflush.h>
+#include <asm/unistd.h>
+
+asmlinkage int compat_sys_fork(struct pt_regs *regs)
+{
+        return do_fork(SIGCHLD, regs->compat_sp, regs, 0, NULL, NULL);
+}
+
+asmlinkage int compat_sys_clone(unsigned long clone_flags, unsigned long newsp,
+                          int __user *parent_tidptr, int tls_val,
+                          int __user *child_tidptr, struct pt_regs *regs)
+{
+        if (!newsp)
+                newsp = regs->compat_sp;
+
+        return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
+}
+
+asmlinkage int compat_sys_vfork(struct pt_regs *regs)
+{
+        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->compat_sp,
+                       regs, 0, NULL, NULL);
+}
+
+asmlinkage int compat_sys_execve(const char __user *filenamei,
+                                 compat_uptr_t argv, compat_uptr_t envp,
+                                 struct pt_regs *regs)
+{
+        int error;
+        char * filename;
+
+        filename = getname(filenamei);
+        error = PTR_ERR(filename);
+        if (IS_ERR(filename))
+                goto out;
+        error = compat_do_execve(filename, compat_ptr(argv), compat_ptr(envp),
+                                 regs);
+        putname(filename);
+out:
+        return error;
+}
+
+asmlinkage int compat_sys_sched_rr_get_interval(compat_pid_t pid,
+                                                struct compat_timespec __user *interval)
+{
+        struct timespec t;
+        int ret;
+        mm_segment_t old_fs = get_fs();
+
+        set_fs(KERNEL_DS);
+        ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
+        set_fs(old_fs);
+        if (put_compat_timespec(&t, interval))
+                return -EFAULT;
+        return ret;
+}
+
+asmlinkage int compat_sys_sendfile(int out_fd, int in_fd,
+                                   compat_off_t __user *offset, s32 count)
+{
+        mm_segment_t old_fs = get_fs();
+        int ret;
+        off_t of;
+
+        if (offset && get_user(of, offset))
+                return -EFAULT;
+
+        set_fs(KERNEL_DS);
+        ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL,
+                           count);
+        set_fs(old_fs);
+
+        if (offset && put_user(of, offset))
+                return -EFAULT;
+        return ret;
+}
+
+static inline void
+do_compat_cache_op(unsigned long start, unsigned long end, int flags)
+{
+        struct mm_struct *mm = current->active_mm;
+        struct vm_area_struct *vma;
+
+        if (end < start || flags)
+                return;
+
+        down_read(&mm->mmap_sem);
+        vma = find_vma(mm, start);
+        if (vma && vma->vm_start < end) {
+                if (start < vma->vm_start)
+                        start = vma->vm_start;
+                if (end > vma->vm_end)
+                        end = vma->vm_end;
+                up_read(&mm->mmap_sem);
+                __flush_cache_user_range(start & PAGE_MASK, PAGE_ALIGN(end));
+                return;
+        }
+        up_read(&mm->mmap_sem);
+}
+
+/*
+ * Handle all unrecognised system calls.
+ */
+long compat_arm_syscall(struct pt_regs *regs)
+{
+        unsigned int no = regs->regs[7];
+
+        switch (no) {
+        /*
+         * Flush a region from virtual address 'r0' to virtual address 'r1'
+         * _exclusive_.  There is no alignment requirement on either address;
+         * user space does not need to know the hardware cache layout.
+         *
+         * r2 contains flags.  It should ALWAYS be passed as ZERO until it
+         * is defined to be something else.  For now we ignore it, but may
+         * the fires of hell burn in your belly if you break this rule. ;)
+         *
+         * (at a later date, we may want to allow this call to not flush
+         * various aspects of the cache.  Passing '0' will guarantee that
+         * everything necessary gets flushed to maintain consistency in
+         * the specified region).
+         */
+        case __ARM_NR_compat_cacheflush:
+                do_compat_cache_op(regs->regs[0], regs->regs[1], regs->regs[2]);
+                return 0;
+
+        case __ARM_NR_compat_set_tls:
+                current->thread.tp_value = regs->regs[0];
+                asm ("msr tpidrro_el0, %0" : : "r" (regs->regs[0]));
+                return 0;
+
+        default:
+                return -ENOSYS;
+        }
+}
diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c
new file mode 100644
index 00000000000..3b4b7258f49
--- /dev/null
+++ b/arch/arm64/kernel/time.c
@@ -0,0 +1,65 @@
+/*
+ * Based on arch/arm/kernel/time.c
+ *
+ * Copyright (C) 1991, 1992, 1995  Linus Torvalds
+ * Modifications for ARM (C) 1994-2001 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/time.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/timex.h>
+#include <linux/errno.h>
+#include <linux/profile.h>
+#include <linux/syscore_ops.h>
+#include <linux/timer.h>
+#include <linux/irq.h>
+
+#include <clocksource/arm_generic.h>
+
+#include <asm/thread_info.h>
+#include <asm/stacktrace.h>
+
+#ifdef CONFIG_SMP
+unsigned long profile_pc(struct pt_regs *regs)
+{
+        struct stackframe frame;
+
+        if (!in_lock_functions(regs->pc))
+                return regs->pc;
+
+        frame.fp = regs->regs[29];
+        frame.sp = regs->sp;
+        frame.pc = regs->pc;
+        do {
+                int ret = unwind_frame(&frame);
+                if (ret < 0)
+                        return 0;
+        } while (in_lock_functions(frame.pc));
+
+        return frame.pc;
+}
+EXPORT_SYMBOL(profile_pc);
+#endif
+
+void __init time_init(void)
+{
+        arm_generic_timer_init();
+}
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
new file mode 100644
index 00000000000..3883f842434
--- /dev/null
+++ b/arch/arm64/kernel/traps.c
@@ -0,0 +1,348 @@
+/*
+ * Based on arch/arm/kernel/traps.c
+ *
+ * Copyright (C) 1995-2009 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/signal.h>
+#include <linux/personality.h>
+#include <linux/kallsyms.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include <linux/hardirq.h>
+#include <linux/kdebug.h>
+#include <linux/module.h>
+#include <linux/kexec.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/syscalls.h>
+
+#include <asm/atomic.h>
+#include <asm/traps.h>
+#include <asm/stacktrace.h>
+#include <asm/exception.h>
+#include <asm/system_misc.h>
+
+static const char *handler[]= {
+        "Synchronous Abort",
+        "IRQ",
+        "FIQ",
+        "Error"
+};
+
+int show_unhandled_signals = 1;
+
+/*
+ * Dump out the contents of some memory nicely...
+ */
+static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
+                     unsigned long top)
+{
+        unsigned long first;
+        mm_segment_t fs;
+        int i;
+
+        /*
+         * We need to switch to kernel mode so that we can use __get_user
+         * to safely read from kernel space.  Note that we now dump the
+         * code first, just in case the backtrace kills us.
+         */
+        fs = get_fs();
+        set_fs(KERNEL_DS);
+
+        printk("%s%s(0x%016lx to 0x%016lx)\n", lvl, str, bottom, top);
+
+        for (first = bottom & ~31; first < top; first += 32) {
+                unsigned long p;
+                char str[sizeof(" 12345678") * 8 + 1];
+
+                memset(str, ' ', sizeof(str));
+                str[sizeof(str) - 1] = '\0';
+
+                for (p = first, i = 0; i < 8 && p < top; i++, p += 4) {
+                        if (p >= bottom && p < top) {
+                                unsigned int val;
+                                if (__get_user(val, (unsigned int *)p) == 0)
+                                        sprintf(str + i * 9, " %08x", val);
+                                else
+                                        sprintf(str + i * 9, " ????????");
+                        }
+                }
+                printk("%s%04lx:%s\n", lvl, first & 0xffff, str);
+        }
+
+        set_fs(fs);
+}
+
+static void dump_backtrace_entry(unsigned long where, unsigned long stack)
+{
+        print_ip_sym(where);
+        if (in_exception_text(where))
+                dump_mem("", "Exception stack", stack,
+                         stack + sizeof(struct pt_regs));
+}
+
+static void dump_instr(const char *lvl, struct pt_regs *regs)
+{
+        unsigned long addr = instruction_pointer(regs);
+        mm_segment_t fs;
+        char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
+        int i;
+
+        /*
+         * We need to switch to kernel mode so that we can use __get_user
+         * to safely read from kernel space.  Note that we now dump the
+         * code first, just in case the backtrace kills us.
+         */
+        fs = get_fs();
+        set_fs(KERNEL_DS);
+
+        for (i = -4; i < 1; i++) {
+                unsigned int val, bad;
+
+                bad = __get_user(val, &((u32 *)addr)[i]);
+
+                if (!bad)
+                        p += sprintf(p, i == 0 ? "(%08x) " : "%08x ", val);
+                else {
+                        p += sprintf(p, "bad PC value");
+                        break;
+                }
+        }
+        printk("%sCode: %s\n", lvl, str);
+
+        set_fs(fs);
+}
+
+static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
+{
+        struct stackframe frame;
+        const register unsigned long current_sp asm ("sp");
+
+        pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
+
+        if (!tsk)
+                tsk = current;
+
+        if (regs) {
+                frame.fp = regs->regs[29];
+                frame.sp = regs->sp;
+                frame.pc = regs->pc;
+        } else if (tsk == current) {
+                frame.fp = (unsigned long)__builtin_frame_address(0);
+                frame.sp = current_sp;
+                frame.pc = (unsigned long)dump_backtrace;
+        } else {
+                /*
+                 * task blocked in __switch_to
+                 */
+                frame.fp = thread_saved_fp(tsk);
+                frame.sp = thread_saved_sp(tsk);
+                frame.pc = thread_saved_pc(tsk);
+        }
+
+        printk("Call trace:\n");
+        while (1) {
+                unsigned long where = frame.pc;
+                int ret;
+
+                ret = unwind_frame(&frame);
+                if (ret < 0)
+                        break;
+                dump_backtrace_entry(where, frame.sp);
+        }
+}
+
+void dump_stack(void)
+{
+        dump_backtrace(NULL, NULL);
+}
+
+EXPORT_SYMBOL(dump_stack);
+
+void show_stack(struct task_struct *tsk, unsigned long *sp)
+{
+        dump_backtrace(NULL, tsk);
+        barrier();
+}
+
+#ifdef CONFIG_PREEMPT
+#define S_PREEMPT " PREEMPT"
+#else
+#define S_PREEMPT ""
+#endif
+#ifdef CONFIG_SMP
+#define S_SMP " SMP"
+#else
+#define S_SMP ""
+#endif
+
+static int __die(const char *str, int err, struct thread_info *thread,
+                 struct pt_regs *regs)
+{
+        struct task_struct *tsk = thread->task;
+        static int die_counter;
+        int ret;
+
+        pr_emerg("Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n",
+                 str, err, ++die_counter);
+
+        /* trap and error numbers are mostly meaningless on ARM */
+        ret = notify_die(DIE_OOPS, str, regs, err, 0, SIGSEGV);
+        if (ret == NOTIFY_STOP)
+                return ret;
+
+        print_modules();
+        __show_regs(regs);
+        pr_emerg("Process %.*s (pid: %d, stack limit = 0x%p)\n",
+                 TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), thread + 1);
+
+        if (!user_mode(regs) || in_interrupt()) {
+                dump_mem(KERN_EMERG, "Stack: ", regs->sp,
+                         THREAD_SIZE + (unsigned long)task_stack_page(tsk));
+                dump_backtrace(regs, tsk);
+                dump_instr(KERN_EMERG, regs);
+        }
+
+        return ret;
+}
+
+static DEFINE_RAW_SPINLOCK(die_lock);
+
+/*
+ * This function is protected against re-entrancy.
+ */
+void die(const char *str, struct pt_regs *regs, int err)
+{
+        struct thread_info *thread = current_thread_info();
+        int ret;
+
+        oops_enter();
+
+        raw_spin_lock_irq(&die_lock);
+        console_verbose();
+        bust_spinlocks(1);
+        ret = __die(str, err, thread, regs);
+
+        if (regs && kexec_should_crash(thread->task))
+                crash_kexec(regs);
+
+        bust_spinlocks(0);
+        add_taint(TAINT_DIE);
+        raw_spin_unlock_irq(&die_lock);
+        oops_exit();
+
+        if (in_interrupt())
+                panic("Fatal exception in interrupt");
+        if (panic_on_oops)
+                panic("Fatal exception");
+        if (ret != NOTIFY_STOP)
+                do_exit(SIGSEGV);
+}
+
+void arm64_notify_die(const char *str, struct pt_regs *regs,
+                      struct siginfo *info, int err)
+{
+        if (user_mode(regs))
+                force_sig_info(info->si_signo, info, current);
+        else
+                die(str, regs, err);
+}
+
+asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
+{
+        siginfo_t info;
+        void __user *pc = (void __user *)instruction_pointer(regs);
+
+#ifdef CONFIG_COMPAT
+        /* check for AArch32 breakpoint instructions */
+        if (compat_user_mode(regs) && aarch32_break_trap(regs) == 0)
+                return;
+#endif
+
+        if (show_unhandled_signals) {
+                pr_info("%s[%d]: undefined instruction: pc=%p\n",
+                        current->comm, task_pid_nr(current), pc);
+                dump_instr(KERN_INFO, regs);
+        }
+
+        info.si_signo = SIGILL;
+        info.si_errno = 0;
+        info.si_code  = ILL_ILLOPC;
+        info.si_addr  = pc;
+
+        arm64_notify_die("Oops - undefined instruction", regs, &info, 0);
+}
+
+long compat_arm_syscall(struct pt_regs *regs);
+
+asmlinkage long do_ni_syscall(struct pt_regs *regs)
+{
+#ifdef CONFIG_COMPAT
+        long ret;
+        if (is_compat_task()) {
+                ret = compat_arm_syscall(regs);
+                if (ret != -ENOSYS)
+                        return ret;
+        }
+#endif
+
+        if (show_unhandled_signals) {
+                pr_info("%s[%d]: syscall %d\n", current->comm,
+                        task_pid_nr(current), (int)regs->syscallno);
+                dump_instr("", regs);
+                if (user_mode(regs))
+                        __show_regs(regs);
+        }
+
+        return sys_ni_syscall();
+}
+
+/*
+ * bad_mode handles the impossible case in the exception vector.
+ */
+asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
+{
+        console_verbose();
+
+        pr_crit("Bad mode in %s handler detected, code 0x%08x\n",
+                handler[reason], esr);
+
+        die("Oops - bad mode", regs, 0);
+        local_irq_disable();
+        panic("bad mode");
+}
+
+void __pte_error(const char *file, int line, unsigned long val)
+{
+        printk("%s:%d: bad pte %016lx.\n", file, line, val);
+}
+
+void __pmd_error(const char *file, int line, unsigned long val)
+{
+        printk("%s:%d: bad pmd %016lx.\n", file, line, val);
+}
+
+void __pgd_error(const char *file, int line, unsigned long val)
+{
+        printk("%s:%d: bad pgd %016lx.\n", file, line, val);
+}
+
+void __init trap_init(void)
+{
+        return;
+}
diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c
new file mode 100644
index 00000000000..17948fc7d66
--- /dev/null
+++ b/arch/arm64/kernel/vdso.c
@@ -0,0 +1,261 @@
+/*
+ * VDSO implementation for AArch64 and vector page setup for AArch32.
+ *
+ * Copyright (C) 2012 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/clocksource.h>
+#include <linux/elf.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/gfp.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+
+#include <asm/cacheflush.h>
+#include <asm/signal32.h>
+#include <asm/vdso.h>
+#include <asm/vdso_datapage.h>
+
+extern char vdso_start, vdso_end;
+static unsigned long vdso_pages;
+static struct page **vdso_pagelist;
+
+/*
+ * The vDSO data page.
+ */
+static union {
+        struct vdso_data        data;
+        u8                      page[PAGE_SIZE];
+} vdso_data_store __page_aligned_data;
+struct vdso_data *vdso_data = &vdso_data_store.data;
+
+#ifdef CONFIG_COMPAT
+/*
+ * Create and map the vectors page for AArch32 tasks.
+ */
+static struct page *vectors_page[1];
+
+static int alloc_vectors_page(void)
+{
+        extern char __kuser_helper_start[], __kuser_helper_end[];
+        int kuser_sz = __kuser_helper_end - __kuser_helper_start;
+        unsigned long vpage;
+
+        vpage = get_zeroed_page(GFP_ATOMIC);
+
+        if (!vpage)
+                return -ENOMEM;
+
+        /* kuser helpers */
+        memcpy((void *)vpage + 0x1000 - kuser_sz, __kuser_helper_start,
+                kuser_sz);
+
+        /* sigreturn code */
+        memcpy((void *)vpage + AARCH32_KERN_SIGRET_CODE_OFFSET,
+                aarch32_sigret_code, sizeof(aarch32_sigret_code));
+
+        flush_icache_range(vpage, vpage + PAGE_SIZE);
+        vectors_page[0] = virt_to_page(vpage);
+
+        return 0;
+}
+arch_initcall(alloc_vectors_page);
+
+int aarch32_setup_vectors_page(struct linux_binprm *bprm, int uses_interp)
+{
+        struct mm_struct *mm = current->mm;
+        unsigned long addr = AARCH32_VECTORS_BASE;
+        int ret;
+
+        down_write(&mm->mmap_sem);
+        current->mm->context.vdso = (void *)addr;
+
+        /* Map vectors page at the high address. */
+        ret = install_special_mapping(mm, addr, PAGE_SIZE,
+                                      VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYEXEC,
+                                      vectors_page);
+
+        up_write(&mm->mmap_sem);
+
+        return ret;
+}
+#endif /* CONFIG_COMPAT */
+
+static int __init vdso_init(void)
+{
+        struct page *pg;
+        char *vbase;
+        int i, ret = 0;
+
+        vdso_pages = (&vdso_end - &vdso_start) >> PAGE_SHIFT;
+        pr_info("vdso: %ld pages (%ld code, %ld data) at base %p\n",
+                vdso_pages + 1, vdso_pages, 1L, &vdso_start);
+
+        /* Allocate the vDSO pagelist, plus a page for the data. */
+        vdso_pagelist = kzalloc(sizeof(struct page *) * (vdso_pages + 1),
+                                GFP_KERNEL);
+        if (vdso_pagelist == NULL) {
+                pr_err("Failed to allocate vDSO pagelist!\n");
+                return -ENOMEM;
+        }
+
+        /* Grab the vDSO code pages. */
+        for (i = 0; i < vdso_pages; i++) {
+                pg = virt_to_page(&vdso_start + i*PAGE_SIZE);
+                ClearPageReserved(pg);
+                get_page(pg);
+                vdso_pagelist[i] = pg;
+        }
+
+        /* Sanity check the shared object header. */
+        vbase = vmap(vdso_pagelist, 1, 0, PAGE_KERNEL);
+        if (vbase == NULL) {
+                pr_err("Failed to map vDSO pagelist!\n");
+                return -ENOMEM;
+        } else if (memcmp(vbase, "\177ELF", 4)) {
+                pr_err("vDSO is not a valid ELF object!\n");
+                ret = -EINVAL;
+                goto unmap;
+        }
+
+        /* Grab the vDSO data page. */
+        pg = virt_to_page(vdso_data);
+        get_page(pg);
+        vdso_pagelist[i] = pg;
+
+unmap:
+        vunmap(vbase);
+        return ret;
+}
+arch_initcall(vdso_init);
+
+int arch_setup_additional_pages(struct linux_binprm *bprm,
+                                int uses_interp)
+{
+        struct mm_struct *mm = current->mm;
+        unsigned long vdso_base, vdso_mapping_len;
+        int ret;
+
+        /* Be sure to map the data page */
+        vdso_mapping_len = (vdso_pages + 1) << PAGE_SHIFT;
+
+        down_write(&mm->mmap_sem);
+        vdso_base = get_unmapped_area(NULL, 0, vdso_mapping_len, 0, 0);
+        if (IS_ERR_VALUE(vdso_base)) {
+                ret = vdso_base;
+                goto up_fail;
+        }
+        mm->context.vdso = (void *)vdso_base;
+
+        ret = install_special_mapping(mm, vdso_base, vdso_mapping_len,
+                                      VM_READ|VM_EXEC|
+                                      VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
+                                      vdso_pagelist);
+        if (ret) {
+                mm->context.vdso = NULL;
+                goto up_fail;
+        }
+
+up_fail:
+        up_write(&mm->mmap_sem);
+
+        return ret;
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+        /*
+         * We can re-use the vdso pointer in mm_context_t for identifying
+         * the vectors page for compat applications. The vDSO will always
+         * sit above TASK_UNMAPPED_BASE and so we don't need to worry about
+         * it conflicting with the vectors base.
+         */
+        if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) {
+#ifdef CONFIG_COMPAT
+                if (vma->vm_start == AARCH32_VECTORS_BASE)
+                        return "[vectors]";
+#endif
+                return "[vdso]";
+        }
+
+        return NULL;
+}
+
+/*
+ * We define AT_SYSINFO_EHDR, so we need these function stubs to keep
+ * Linux happy.
+ */
+int in_gate_area_no_mm(unsigned long addr)
+{
+        return 0;
+}
+
+int in_gate_area(struct mm_struct *mm, unsigned long addr)
+{
+        return 0;
+}
+
+struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
+{
+        return NULL;
+}
+
+/*
+ * Update the vDSO data page to keep in sync with kernel timekeeping.
+ */
+void update_vsyscall(struct timespec *ts, struct timespec *wtm,
+                     struct clocksource *clock, u32 mult)
+{
+        struct timespec xtime_coarse;
+        u32 use_syscall = strcmp(clock->name, "arch_sys_counter");
+
+        ++vdso_data->tb_seq_count;
+        smp_wmb();
+
+        xtime_coarse = __current_kernel_time();
+        vdso_data->use_syscall                  = use_syscall;
+        vdso_data->xtime_coarse_sec             = xtime_coarse.tv_sec;
+        vdso_data->xtime_coarse_nsec            = xtime_coarse.tv_nsec;
+
+        if (!use_syscall) {
+                vdso_data->cs_cycle_last        = clock->cycle_last;
+                vdso_data->xtime_clock_sec      = ts->tv_sec;
+                vdso_data->xtime_clock_nsec     = ts->tv_nsec;
+                vdso_data->cs_mult              = mult;
+                vdso_data->cs_shift             = clock->shift;
+                vdso_data->wtm_clock_sec        = wtm->tv_sec;
+                vdso_data->wtm_clock_nsec       = wtm->tv_nsec;
+        }
+
+        smp_wmb();
+        ++vdso_data->tb_seq_count;
+}
+
+void update_vsyscall_tz(void)
+{
+        ++vdso_data->tb_seq_count;
+        smp_wmb();
+        vdso_data->tz_minuteswest       = sys_tz.tz_minuteswest;
+        vdso_data->tz_dsttime           = sys_tz.tz_dsttime;
+        smp_wmb();
+        ++vdso_data->tb_seq_count;
+}
diff --git a/arch/arm64/kernel/vdso/.gitignore b/arch/arm64/kernel/vdso/.gitignore
new file mode 100644
index 00000000000..b8cc94e9698
--- /dev/null
+++ b/arch/arm64/kernel/vdso/.gitignore
@@ -0,0 +1,2 @@
+vdso.lds
+vdso-offsets.h
diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
new file mode 100644
index 00000000000..d8064af42e6
--- /dev/null
+++ b/arch/arm64/kernel/vdso/Makefile
@@ -0,0 +1,63 @@
+#
+# Building a vDSO image for AArch64.
+#
+# Author: Will Deacon <will.deacon@arm.com>
+# Heavily based on the vDSO Makefiles for other archs.
+#
+
+obj-vdso := gettimeofday.o note.o sigreturn.o
+
+# Build rules
+targets := $(obj-vdso) vdso.so vdso.so.dbg
+obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
+
+ccflags-y := -shared -fno-common -fno-builtin
+ccflags-y += -nostdlib -Wl,-soname=linux-vdso.so.1 \
+                $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
+
+obj-y += vdso.o
+extra-y += vdso.lds vdso-offsets.h
+CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
+
+# Force dependency (incbin is bad)
+$(obj)/vdso.o : $(obj)/vdso.so
+
+# Link rule for the .so file, .lds has to be first
+$(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso)
+        $(call if_changed,vdsold)
+
+# Strip rule for the .so file
+$(obj)/%.so: OBJCOPYFLAGS := -S
+$(obj)/%.so: $(obj)/%.so.dbg FORCE
+        $(call if_changed,objcopy)
+
+# Generate VDSO offsets using helper script
+gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
+quiet_cmd_vdsosym = VDSOSYM $@
+define cmd_vdsosym
+        $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ && \
+        cp $@ include/generated/
+endef
+
+$(obj)/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
+        $(call if_changed,vdsosym)
+
+# Assembly rules for the .S files
+$(obj-vdso): %.o: %.S
+        $(call if_changed_dep,vdsoas)
+
+# Actual build commands
+quiet_cmd_vdsold = VDSOL $@
+      cmd_vdsold = $(CC) $(c_flags) -Wl,-T $^ -o $@
+quiet_cmd_vdsoas = VDSOA $@
+      cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $<
+
+# Install commands for the unstripped file
+quiet_cmd_vdso_install = INSTALL $@
+      cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
+
+vdso.so: $(obj)/vdso.so.dbg
+        @mkdir -p $(MODLIB)/vdso
+        $(call cmd,vdso_install)
+
+vdso_install: vdso.so
diff --git a/arch/arm64/kernel/vdso/gen_vdso_offsets.sh b/arch/arm64/kernel/vdso/gen_vdso_offsets.sh
new file mode 100755
index 00000000000..01924ff071a
--- /dev/null
+++ b/arch/arm64/kernel/vdso/gen_vdso_offsets.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+#
+# Match symbols in the DSO that look like VDSO_*; produce a header file
+# of constant offsets into the shared object.
+#
+# Doing this inside the Makefile will break the $(filter-out) function,
+# causing Kbuild to rebuild the vdso-offsets header file every time.
+#
+# Author: Will Deacon <will.deacon@arm.com
+#
+
+LC_ALL=C
+sed -n -e 's/^00*/0/' -e \
+'s/^\([0-9a-fA-F]*\) . VDSO_\([a-zA-Z0-9_]*\)$/\#define vdso_offset_\2\t0x\1/p'
diff --git a/arch/arm64/kernel/vdso/gettimeofday.S b/arch/arm64/kernel/vdso/gettimeofday.S
new file mode 100644
index 00000000000..dcb8c203a3b
--- /dev/null
+++ b/arch/arm64/kernel/vdso/gettimeofday.S
@@ -0,0 +1,242 @@
+/*
+ * Userspace implementations of gettimeofday() and friends.
+ *
+ * Copyright (C) 2012 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/unistd.h>
+
+#define NSEC_PER_SEC_LO16       0xca00
+#define NSEC_PER_SEC_HI16       0x3b9a
+
+vdso_data       .req    x6
+use_syscall     .req    w7
+seqcnt          .req    w8
+
+        .macro  seqcnt_acquire
+9999:   ldr     seqcnt, [vdso_data, #VDSO_TB_SEQ_COUNT]
+        tbnz    seqcnt, #0, 9999b
+        dmb     ishld
+        ldr     use_syscall, [vdso_data, #VDSO_USE_SYSCALL]
+        .endm
+
+        .macro  seqcnt_read, cnt
+        dmb     ishld
+        ldr     \cnt, [vdso_data, #VDSO_TB_SEQ_COUNT]
+        .endm
+
+        .macro  seqcnt_check, cnt, fail
+        cmp     \cnt, seqcnt
+        b.ne    \fail
+        .endm
+
+        .text
+
+/* int __kernel_gettimeofday(struct timeval *tv, struct timezone *tz); */
+ENTRY(__kernel_gettimeofday)
+        .cfi_startproc
+        mov     x2, x30
+        .cfi_register x30, x2
+
+        /* Acquire the sequence counter and get the timespec. */
+        adr     vdso_data, _vdso_data
+1:      seqcnt_acquire
+        cbnz    use_syscall, 4f
+
+        /* If tv is NULL, skip to the timezone code. */
+        cbz     x0, 2f
+        bl      __do_get_tspec
+        seqcnt_check w13, 1b
+
+        /* Convert ns to us. */
+        mov     x11, #1000
+        udiv    x10, x10, x11
+        stp     x9, x10, [x0, #TVAL_TV_SEC]
+2:
+        /* If tz is NULL, return 0. */
+        cbz     x1, 3f
+        ldp     w4, w5, [vdso_data, #VDSO_TZ_MINWEST]
+        seqcnt_read w13
+        seqcnt_check w13, 1b
+        stp     w4, w5, [x1, #TZ_MINWEST]
+3:
+        mov     x0, xzr
+        ret     x2
+4:
+        /* Syscall fallback. */
+        mov     x8, #__NR_gettimeofday
+        svc     #0
+        ret     x2
+        .cfi_endproc
+ENDPROC(__kernel_gettimeofday)
+
+/* int __kernel_clock_gettime(clockid_t clock_id, struct timespec *tp); */
+ENTRY(__kernel_clock_gettime)
+        .cfi_startproc
+        cmp     w0, #CLOCK_REALTIME
+        ccmp    w0, #CLOCK_MONOTONIC, #0x4, ne
+        b.ne    2f
+
+        mov     x2, x30
+        .cfi_register x30, x2
+
+        /* Get kernel timespec. */
+        adr     vdso_data, _vdso_data
+1:      seqcnt_acquire
+        cbnz    use_syscall, 7f
+
+        bl      __do_get_tspec
+        seqcnt_check w13, 1b
+
+        cmp     w0, #CLOCK_MONOTONIC
+        b.ne    6f
+
+        /* Get wtm timespec. */
+        ldp     x14, x15, [vdso_data, #VDSO_WTM_CLK_SEC]
+
+        /* Check the sequence counter. */
+        seqcnt_read w13
+        seqcnt_check w13, 1b
+        b       4f
+2:
+        cmp     w0, #CLOCK_REALTIME_COARSE
+        ccmp    w0, #CLOCK_MONOTONIC_COARSE, #0x4, ne
+        b.ne    8f
+
+        /* Get coarse timespec. */
+        adr     vdso_data, _vdso_data
+3:      seqcnt_acquire
+        ldp     x9, x10, [vdso_data, #VDSO_XTIME_CRS_SEC]
+
+        cmp     w0, #CLOCK_MONOTONIC_COARSE
+        b.ne    6f
+
+        /* Get wtm timespec. */
+        ldp     x14, x15, [vdso_data, #VDSO_WTM_CLK_SEC]
+
+        /* Check the sequence counter. */
+        seqcnt_read w13
+        seqcnt_check w13, 3b
+4:
+        /* Add on wtm timespec. */
+        add     x9, x9, x14
+        add     x10, x10, x15
+
+        /* Normalise the new timespec. */
+        mov     x14, #NSEC_PER_SEC_LO16
+        movk    x14, #NSEC_PER_SEC_HI16, lsl #16
+        cmp     x10, x14
+        b.lt    5f
+        sub     x10, x10, x14
+        add     x9, x9, #1
+5:
+        cmp     x10, #0
+        b.ge    6f
+        add     x10, x10, x14
+        sub     x9, x9, #1
+
+6:      /* Store to the user timespec. */
+        stp     x9, x10, [x1, #TSPEC_TV_SEC]
+        mov     x0, xzr
+        ret     x2
+7:
+        mov     x30, x2
+8:      /* Syscall fallback. */
+        mov     x8, #__NR_clock_gettime
+        svc     #0
+        ret
+        .cfi_endproc
+ENDPROC(__kernel_clock_gettime)
+
+/* int __kernel_clock_getres(clockid_t clock_id, struct timespec *res); */
+ENTRY(__kernel_clock_getres)
+        .cfi_startproc
+        cbz     w1, 3f
+
+        cmp     w0, #CLOCK_REALTIME
+        ccmp    w0, #CLOCK_MONOTONIC, #0x4, ne
+        b.ne    1f
+
+        ldr     x2, 5f
+        b       2f
+1:
+        cmp     w0, #CLOCK_REALTIME_COARSE
+        ccmp    w0, #CLOCK_MONOTONIC_COARSE, #0x4, ne
+        b.ne    4f
+        ldr     x2, 6f
+2:
+        stp     xzr, x2, [x1]
+
+3:      /* res == NULL. */
+        mov     w0, wzr
+        ret
+
+4:      /* Syscall fallback. */
+        mov     x8, #__NR_clock_getres
+        svc     #0
+        ret
+5:
+        .quad   CLOCK_REALTIME_RES
+6:
+        .quad   CLOCK_COARSE_RES
+        .cfi_endproc
+ENDPROC(__kernel_clock_getres)
+
+/*
+ * Read the current time from the architected counter.
+ * Expects vdso_data to be initialised.
+ * Clobbers the temporary registers (x9 - x15).
+ * Returns:
+ *  - (x9, x10) = (ts->tv_sec, ts->tv_nsec)
+ *  - (x11, x12) = (xtime->tv_sec, xtime->tv_nsec)
+ *  - w13 = vDSO sequence counter
+ */
+ENTRY(__do_get_tspec)
+        .cfi_startproc
+
+        /* Read from the vDSO data page. */
+        ldr     x10, [vdso_data, #VDSO_CS_CYCLE_LAST]
+        ldp     x11, x12, [vdso_data, #VDSO_XTIME_CLK_SEC]
+        ldp     w14, w15, [vdso_data, #VDSO_CS_MULT]
+        seqcnt_read w13
+
+        /* Read the physical counter. */
+        isb
+        mrs     x9, cntpct_el0
+
+        /* Calculate cycle delta and convert to ns. */
+        sub     x10, x9, x10
+        /* We can only guarantee 56 bits of precision. */
+        movn    x9, #0xff0, lsl #48
+        and     x10, x9, x10
+        mul     x10, x10, x14
+        lsr     x10, x10, x15
+
+        /* Use the kernel time to calculate the new timespec. */
+        add     x10, x12, x10
+        mov     x14, #NSEC_PER_SEC_LO16
+        movk    x14, #NSEC_PER_SEC_HI16, lsl #16
+        udiv    x15, x10, x14
+        add     x9, x15, x11
+        mul     x14, x14, x15
+        sub     x10, x10, x14
+
+        ret
+        .cfi_endproc
+ENDPROC(__do_get_tspec)
diff --git a/arch/arm64/kernel/vdso/note.S b/arch/arm64/kernel/vdso/note.S
new file mode 100644
index 00000000000..b82c85e5d97
--- /dev/null
+++ b/arch/arm64/kernel/vdso/note.S
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2012 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ *
+ * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text.
+ * Here we can supply some information useful to userland.
+ */
+
+#include <linux/uts.h>
+#include <linux/version.h>
+#include <linux/elfnote.h>
+
+ELFNOTE_START(Linux, 0, "a")
+        .long LINUX_VERSION_CODE
+ELFNOTE_END
diff --git a/arch/arm64/kernel/vdso/sigreturn.S b/arch/arm64/kernel/vdso/sigreturn.S
new file mode 100644
index 00000000000..20d98effa7d
--- /dev/null
+++ b/arch/arm64/kernel/vdso/sigreturn.S
@@ -0,0 +1,37 @@
+/*
+ * Sigreturn trampoline for returning from a signal when the SA_RESTORER
+ * flag is not set.
+ *
+ * Copyright (C) 2012 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#include <linux/linkage.h>
+#include <asm/unistd.h>
+
+        .text
+
+        nop
+ENTRY(__kernel_rt_sigreturn)
+        .cfi_startproc
+        .cfi_signal_frame
+        .cfi_def_cfa    x29, 0
+        .cfi_offset     x29, 0 * 8
+        .cfi_offset     x30, 1 * 8
+        mov     x8, #__NR_rt_sigreturn
+        svc     #0
+        .cfi_endproc
+ENDPROC(__kernel_rt_sigreturn)
diff --git a/arch/arm64/kernel/vdso/vdso.S b/arch/arm64/kernel/vdso/vdso.S
new file mode 100644
index 00000000000..60c1db54b41
--- /dev/null
+++ b/arch/arm64/kernel/vdso/vdso.S
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2012 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <linux/const.h>
+#include <asm/page.h>
+
+        __PAGE_ALIGNED_DATA
+
+        .globl vdso_start, vdso_end
+        .balign PAGE_SIZE
+vdso_start:
+        .incbin "arch/arm64/kernel/vdso/vdso.so"
+        .balign PAGE_SIZE
+vdso_end:
+
+        .previous
diff --git a/arch/arm64/kernel/vdso/vdso.lds.S b/arch/arm64/kernel/vdso/vdso.lds.S
new file mode 100644
index 00000000000..8154b8d1c82
--- /dev/null
+++ b/arch/arm64/kernel/vdso/vdso.lds.S
@@ -0,0 +1,100 @@
+/*
+ * GNU linker script for the VDSO library.
+*
+ * Copyright (C) 2012 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ * Heavily based on the vDSO linker scripts for other archs.
+ */
+
+#include <linux/const.h>
+#include <asm/page.h>
+#include <asm/vdso.h>
+
+OUTPUT_FORMAT("elf64-littleaarch64", "elf64-bigaarch64", "elf64-littleaarch64")
+OUTPUT_ARCH(aarch64)
+
+SECTIONS
+{
+        . = VDSO_LBASE + SIZEOF_HEADERS;
+
+        .hash           : { *(.hash) }                  :text
+        .gnu.hash       : { *(.gnu.hash) }
+        .dynsym         : { *(.dynsym) }
+        .dynstr         : { *(.dynstr) }
+        .gnu.version    : { *(.gnu.version) }
+        .gnu.version_d  : { *(.gnu.version_d) }
+        .gnu.version_r  : { *(.gnu.version_r) }
+
+        .note           : { *(.note.*) }                :text   :note
+
+        . = ALIGN(16);
+
+        .text           : { *(.text*) }                 :text   =0xd503201f
+        PROVIDE (__etext = .);
+        PROVIDE (_etext = .);
+        PROVIDE (etext = .);
+
+        .eh_frame_hdr   : { *(.eh_frame_hdr) }          :text   :eh_frame_hdr
+        .eh_frame       : { KEEP (*(.eh_frame)) }       :text
+
+        .dynamic        : { *(.dynamic) }               :text   :dynamic
+
+        .rodata         : { *(.rodata*) }               :text
+
+        _end = .;
+        PROVIDE(end = .);
+
+        . = ALIGN(PAGE_SIZE);
+        PROVIDE(_vdso_data = .);
+
+        /DISCARD/       : {
+                *(.note.GNU-stack)
+                *(.data .data.* .gnu.linkonce.d.* .sdata*)
+                *(.bss .sbss .dynbss .dynsbss)
+        }
+}
+
+/*
+ * We must supply the ELF program headers explicitly to get just one
+ * PT_LOAD segment, and set the flags explicitly to make segments read-only.
+ */
+PHDRS
+{
+        text            PT_LOAD         FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
+        dynamic         PT_DYNAMIC      FLAGS(4);               /* PF_R */
+        note            PT_NOTE         FLAGS(4);               /* PF_R */
+        eh_frame_hdr    PT_GNU_EH_FRAME;
+}
+
+/*
+ * This controls what symbols we export from the DSO.
+ */
+VERSION
+{
+        LINUX_2.6.39 {
+        global:
+                __kernel_rt_sigreturn;
+                __kernel_gettimeofday;
+                __kernel_clock_gettime;
+                __kernel_clock_getres;
+        local: *;
+        };
+}
+
+/*
+ * Make the sigreturn code visible to the kernel.
+ */
+VDSO_sigtramp           = __kernel_rt_sigreturn;
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
new file mode 100644
index 00000000000..3fae2be8b01
--- /dev/null
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -0,0 +1,126 @@
+/*
+ * ld script to make ARM Linux kernel
+ * taken from the i386 version by Russell King
+ * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
+ */
+
+#include <asm-generic/vmlinux.lds.h>
+#include <asm/thread_info.h>
+#include <asm/memory.h>
+#include <asm/page.h>
+
+#define ARM_EXIT_KEEP(x)
+#define ARM_EXIT_DISCARD(x)     x
+
+OUTPUT_ARCH(aarch64)
+ENTRY(stext)
+
+jiffies = jiffies_64;
+
+SECTIONS
+{
+        /*
+         * XXX: The linker does not define how output sections are
+         * assigned to input sections when there are multiple statements
+         * matching the same input section name.  There is no documented
+         * order of matching.
+         */
+        /DISCARD/ : {
+                ARM_EXIT_DISCARD(EXIT_TEXT)
+                ARM_EXIT_DISCARD(EXIT_DATA)
+                EXIT_CALL
+                *(.discard)
+                *(.discard.*)
+        }
+
+        . = PAGE_OFFSET + TEXT_OFFSET;
+
+        .head.text : {
+                _text = .;
+                HEAD_TEXT
+        }
+        .text : {                       /* Real text segment            */
+                _stext = .;             /* Text and read-only data      */
+                        *(.smp.pen.text)
+                        __exception_text_start = .;
+                        *(.exception.text)
+                        __exception_text_end = .;
+                        IRQENTRY_TEXT
+                        TEXT_TEXT
+                        SCHED_TEXT
+                        LOCK_TEXT
+                        *(.fixup)
+                        *(.gnu.warning)
+                . = ALIGN(16);
+                *(.got)                 /* Global offset table          */
+        }
+
+        RO_DATA(PAGE_SIZE)
+
+        _etext = .;                     /* End of text and rodata section */
+
+        . = ALIGN(PAGE_SIZE);
+        __init_begin = .;
+
+        INIT_TEXT_SECTION(8)
+        .exit.text : {
+                ARM_EXIT_KEEP(EXIT_TEXT)
+        }
+        . = ALIGN(16);
+        .init.data : {
+                INIT_DATA
+                INIT_SETUP(16)
+                INIT_CALLS
+                CON_INITCALL
+                SECURITY_INITCALL
+                INIT_RAM_FS
+        }
+        .exit.data : {
+                ARM_EXIT_KEEP(EXIT_DATA)
+        }
+
+        PERCPU_SECTION(64)
+
+        __init_end = .;
+        . = ALIGN(THREAD_SIZE);
+        __data_loc = .;
+
+        .data : AT(__data_loc) {
+                _data = .;              /* address in memory */
+                _sdata = .;
+
+                /*
+                 * first, the init task union, aligned
+                 * to an 8192 byte boundary.
+                 */
+                INIT_TASK_DATA(THREAD_SIZE)
+                NOSAVE_DATA
+                CACHELINE_ALIGNED_DATA(64)
+                READ_MOSTLY_DATA(64)
+
+                /*
+                 * The exception fixup table (might need resorting at runtime)
+                 */
+                . = ALIGN(32);
+                __start___ex_table = .;
+                *(__ex_table)
+                __stop___ex_table = .;
+
+                /*
+                 * and the usual data section
+                 */
+                DATA_DATA
+                CONSTRUCTORS
+
+                _edata = .;
+        }
+        _edata_loc = __data_loc + SIZEOF(.data);
+
+        NOTES
+
+        BSS_SECTION(0, 0, 0)
+        _end = .;
+
+        STABS_DEBUG
+        .comment 0 : { *(.comment) }
+}
diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile
new file mode 100644
index 00000000000..2fb7f6092aa
--- /dev/null
+++ b/arch/arm64/lib/Makefile
@@ -0,0 +1,4 @@
+lib-y           := bitops.o delay.o                                     \
+                   strncpy_from_user.o strnlen_user.o clear_user.o      \
+                   copy_from_user.o copy_to_user.o copy_in_user.o       \
+                   copy_page.o clear_page.o
diff --git a/arch/arm64/lib/bitops.c b/arch/arm64/lib/bitops.c
new file mode 100644
index 00000000000..aa4965e60ac
--- /dev/null
+++ b/arch/arm64/lib/bitops.c
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2012 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/atomic.h>
+
+#ifdef CONFIG_SMP
+arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned = {
+       [0 ... (ATOMIC_HASH_SIZE-1)]  = __ARCH_SPIN_LOCK_UNLOCKED
+};
+#endif
diff --git a/arch/arm64/lib/clear_page.S b/arch/arm64/lib/clear_page.S
new file mode 100644
index 00000000000..ef08e905e35
--- /dev/null
+++ b/arch/arm64/lib/clear_page.S
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <linux/const.h>
+#include <asm/assembler.h>
+#include <asm/page.h>
+
+/*
+ * Clear page @dest
+ *
+ * Parameters:
+ *      x0 - dest
+ */
+ENTRY(clear_page)
+        mrs     x1, dczid_el0
+        and     w1, w1, #0xf
+        mov     x2, #4
+        lsl     x1, x2, x1
+
+1:      dc      zva, x0
+        add     x0, x0, x1
+        tst     x0, #(PAGE_SIZE - 1)
+        b.ne    1b
+        ret
+ENDPROC(clear_page)
diff --git a/arch/arm64/lib/clear_user.S b/arch/arm64/lib/clear_user.S
new file mode 100644
index 00000000000..6e0ed93d51f
--- /dev/null
+++ b/arch/arm64/lib/clear_user.S
@@ -0,0 +1,58 @@
+/*
+ * Based on arch/arm/lib/clear_user.S
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+        .text
+
+/* Prototype: int __clear_user(void *addr, size_t sz)
+ * Purpose  : clear some user memory
+ * Params   : addr - user memory address to clear
+ *          : sz   - number of bytes to clear
+ * Returns  : number of bytes NOT cleared
+ *
+ * Alignment fixed up by hardware.
+ */
+ENTRY(__clear_user)
+        mov     x2, x1                  // save the size for fixup return
+        subs    x1, x1, #8
+        b.mi    2f
+1:
+USER(9f, str    xzr, [x0], #8   )
+        subs    x1, x1, #8
+        b.pl    1b
+2:      adds    x1, x1, #4
+        b.mi    3f
+USER(9f, str    wzr, [x0], #4   )
+        sub     x1, x1, #4
+3:      adds    x1, x1, #2
+        b.mi    4f
+USER(9f, strh   wzr, [x0], #2   )
+        sub     x1, x1, #2
+4:      adds    x1, x1, #1
+        b.mi    5f
+        strb    wzr, [x0]
+5:      mov     x0, #0
+        ret
+ENDPROC(__clear_user)
+
+        .section .fixup,"ax"
+        .align  2
+9:      mov     x0, x2                  // return the original size
+        ret
+        .previous
diff --git a/arch/arm64/lib/copy_from_user.S b/arch/arm64/lib/copy_from_user.S
new file mode 100644
index 00000000000..5e27add9d36
--- /dev/null
+++ b/arch/arm64/lib/copy_from_user.S
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Copy from user space to a kernel buffer (alignment handled by the hardware)
+ *
+ * Parameters:
+ *      x0 - to
+ *      x1 - from
+ *      x2 - n
+ * Returns:
+ *      x0 - bytes not copied
+ */
+ENTRY(__copy_from_user)
+        add     x4, x1, x2                      // upper user buffer boundary
+        subs    x2, x2, #8
+        b.mi    2f
+1:
+USER(9f, ldr    x3, [x1], #8    )
+        subs    x2, x2, #8
+        str     x3, [x0], #8
+        b.pl    1b
+2:      adds    x2, x2, #4
+        b.mi    3f
+USER(9f, ldr    w3, [x1], #4    )
+        sub     x2, x2, #4
+        str     w3, [x0], #4
+3:      adds    x2, x2, #2
+        b.mi    4f
+USER(9f, ldrh   w3, [x1], #2    )
+        sub     x2, x2, #2
+        strh    w3, [x0], #2
+4:      adds    x2, x2, #1
+        b.mi    5f
+USER(9f, ldrb   w3, [x1]        )
+        strb    w3, [x0]
+5:      mov     x0, #0
+        ret
+ENDPROC(__copy_from_user)
+
+        .section .fixup,"ax"
+        .align  2
+9:      sub     x2, x4, x1
+        mov     x3, x2
+10:     strb    wzr, [x0], #1                   // zero remaining buffer space
+        subs    x3, x3, #1
+        b.ne    10b
+        mov     x0, x2                          // bytes not copied
+        ret
+        .previous
diff --git a/arch/arm64/lib/copy_in_user.S b/arch/arm64/lib/copy_in_user.S
new file mode 100644
index 00000000000..84b6c9bb9b9
--- /dev/null
+++ b/arch/arm64/lib/copy_in_user.S
@@ -0,0 +1,63 @@
+/*
+ * Copy from user space to user space
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Copy from user space to user space (alignment handled by the hardware)
+ *
+ * Parameters:
+ *      x0 - to
+ *      x1 - from
+ *      x2 - n
+ * Returns:
+ *      x0 - bytes not copied
+ */
+ENTRY(__copy_in_user)
+        add     x4, x0, x2                      // upper user buffer boundary
+        subs    x2, x2, #8
+        b.mi    2f
+1:
+USER(9f, ldr    x3, [x1], #8    )
+        subs    x2, x2, #8
+USER(9f, str    x3, [x0], #8    )
+        b.pl    1b
+2:      adds    x2, x2, #4
+        b.mi    3f
+USER(9f, ldr    w3, [x1], #4    )
+        sub     x2, x2, #4
+USER(9f, str    w3, [x0], #4    )
+3:      adds    x2, x2, #2
+        b.mi    4f
+USER(9f, ldrh   w3, [x1], #2    )
+        sub     x2, x2, #2
+USER(9f, strh   w3, [x0], #2    )
+4:      adds    x2, x2, #1
+        b.mi    5f
+USER(9f, ldrb   w3, [x1]        )
+USER(9f, strb   w3, [x0]        )
+5:      mov     x0, #0
+        ret
+ENDPROC(__copy_in_user)
+
+        .section .fixup,"ax"
+        .align  2
+9:      sub     x0, x4, x0                      // bytes not copied
+        ret
+        .previous
diff --git a/arch/arm64/lib/copy_page.S b/arch/arm64/lib/copy_page.S
new file mode 100644
index 00000000000..512b9a7b980
--- /dev/null
+++ b/arch/arm64/lib/copy_page.S
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <linux/const.h>
+#include <asm/assembler.h>
+#include <asm/page.h>
+
+/*
+ * Copy a page from src to dest (both are page aligned)
+ *
+ * Parameters:
+ *      x0 - dest
+ *      x1 - src
+ */
+ENTRY(copy_page)
+        /* Assume cache line size is 64 bytes. */
+        prfm    pldl1strm, [x1, #64]
+1:      ldp     x2, x3, [x1]
+        ldp     x4, x5, [x1, #16]
+        ldp     x6, x7, [x1, #32]
+        ldp     x8, x9, [x1, #48]
+        add     x1, x1, #64
+        prfm    pldl1strm, [x1, #64]
+        stnp    x2, x3, [x0]
+        stnp    x4, x5, [x0, #16]
+        stnp    x6, x7, [x0, #32]
+        stnp    x8, x9, [x0, #48]
+        add     x0, x0, #64
+        tst     x1, #(PAGE_SIZE - 1)
+        b.ne    1b
+        ret
+ENDPROC(copy_page)
diff --git a/arch/arm64/lib/copy_to_user.S b/arch/arm64/lib/copy_to_user.S
new file mode 100644
index 00000000000..a0aeeb9b7a2
--- /dev/null
+++ b/arch/arm64/lib/copy_to_user.S
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Copy to user space from a kernel buffer (alignment handled by the hardware)
+ *
+ * Parameters:
+ *      x0 - to
+ *      x1 - from
+ *      x2 - n
+ * Returns:
+ *      x0 - bytes not copied
+ */
+ENTRY(__copy_to_user)
+        add     x4, x0, x2                      // upper user buffer boundary
+        subs    x2, x2, #8
+        b.mi    2f
+1:
+        ldr     x3, [x1], #8
+        subs    x2, x2, #8
+USER(9f, str    x3, [x0], #8    )
+        b.pl    1b
+2:      adds    x2, x2, #4
+        b.mi    3f
+        ldr     w3, [x1], #4
+        sub     x2, x2, #4
+USER(9f, str    w3, [x0], #4    )
+3:      adds    x2, x2, #2
+        b.mi    4f
+        ldrh    w3, [x1], #2
+        sub     x2, x2, #2
+USER(9f, strh   w3, [x0], #2    )
+4:      adds    x2, x2, #1
+        b.mi    5f
+        ldrb    w3, [x1]
+USER(9f, strb   w3, [x0]        )
+5:      mov     x0, #0
+        ret
+ENDPROC(__copy_to_user)
+
+        .section .fixup,"ax"
+        .align  2
+9:      sub     x0, x4, x0                      // bytes not copied
+        ret
+        .previous
diff --git a/arch/arm64/lib/delay.c b/arch/arm64/lib/delay.c
new file mode 100644
index 00000000000..dad4ec9bbfd
--- /dev/null
+++ b/arch/arm64/lib/delay.c
@@ -0,0 +1,55 @@
+/*
+ * Delay loops based on the OpenRISC implementation.
+ *
+ * Copyright (C) 2012 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/timex.h>
+
+void __delay(unsigned long cycles)
+{
+        cycles_t start = get_cycles();
+
+        while ((get_cycles() - start) < cycles)
+                cpu_relax();
+}
+EXPORT_SYMBOL(__delay);
+
+inline void __const_udelay(unsigned long xloops)
+{
+        unsigned long loops;
+
+        loops = xloops * loops_per_jiffy * HZ;
+        __delay(loops >> 32);
+}
+EXPORT_SYMBOL(__const_udelay);
+
+void __udelay(unsigned long usecs)
+{
+        __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */
+}
+EXPORT_SYMBOL(__udelay);
+
+void __ndelay(unsigned long nsecs)
+{
+        __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */
+}
+EXPORT_SYMBOL(__ndelay);
diff --git a/arch/arm64/lib/strncpy_from_user.S b/arch/arm64/lib/strncpy_from_user.S
new file mode 100644
index 00000000000..56e448a831a
--- /dev/null
+++ b/arch/arm64/lib/strncpy_from_user.S
@@ -0,0 +1,50 @@
+/*
+ * Based on arch/arm/lib/strncpy_from_user.S
+ *
+ * Copyright (C) 1995-2000 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+        .text
+        .align  5
+
+/*
+ * Copy a string from user space to kernel space.
+ *  x0 = dst, x1 = src, x2 = byte length
+ * returns the number of characters copied (strlen of copied string),
+ *  -EFAULT on exception, or "len" if we fill the whole buffer
+ */
+ENTRY(__strncpy_from_user)
+        mov     x4, x1
+1:      subs    x2, x2, #1
+        bmi     2f
+USER(9f, ldrb   w3, [x1], #1    )
+        strb    w3, [x0], #1
+        cbnz    w3, 1b
+        sub     x1, x1, #1      // take NUL character out of count
+2:      sub     x0, x1, x4
+        ret
+ENDPROC(__strncpy_from_user)
+
+        .section .fixup,"ax"
+        .align  0
+9:      strb    wzr, [x0]       // null terminate
+        mov     x0, #-EFAULT
+        ret
+        .previous
diff --git a/arch/arm64/lib/strnlen_user.S b/arch/arm64/lib/strnlen_user.S
new file mode 100644
index 00000000000..7f7b176a564
--- /dev/null
+++ b/arch/arm64/lib/strnlen_user.S
@@ -0,0 +1,47 @@
+/*
+ * Based on arch/arm/lib/strnlen_user.S
+ *
+ * Copyright (C) 1995-2000 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+        .text
+        .align  5
+
+/* Prototype: unsigned long __strnlen_user(const char *str, long n)
+ * Purpose  : get length of a string in user memory
+ * Params   : str - address of string in user memory
+ * Returns  : length of string *including terminator*
+ *            or zero on exception, or n if too long
+ */
+ENTRY(__strnlen_user)
+        mov     x2, x0
+1:      subs    x1, x1, #1
+        b.mi    2f
+USER(9f, ldrb   w3, [x0], #1    )
+        cbnz    w3, 1b
+2:      sub     x0, x0, x2
+        ret
+ENDPROC(__strnlen_user)
+
+        .section .fixup,"ax"
+        .align  0
+9:      mov     x0, #0
+        ret
+        .previous
diff --git a/arch/arm64/mm/Makefile b/arch/arm64/mm/Makefile
new file mode 100644
index 00000000000..3140a2abcdc
--- /dev/null
+++ b/arch/arm64/mm/Makefile
@@ -0,0 +1,4 @@
+obj-y                           := dma-mapping.o extable.o fault.o init.o \
+                                   cache.o copypage.o flush.o \
+                                   ioremap.o mmap.o pgd.o mmu.o \
+                                   context.o tlb.o proc.o
diff --git a/arch/arm64/mm/cache.S b/arch/arm64/mm/cache.S
new file mode 100644
index 00000000000..abe69b80cf7
--- /dev/null
+++ b/arch/arm64/mm/cache.S
@@ -0,0 +1,168 @@
+/*
+ * Cache maintenance
+ *
+ * Copyright (C) 2001 Deep Blue Solutions Ltd.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/assembler.h>
+
+#include "proc-macros.S"
+
+/*
+ *      __flush_dcache_all()
+ *
+ *      Flush the whole D-cache.
+ *
+ *      Corrupted registers: x0-x7, x9-x11
+ */
+ENTRY(__flush_dcache_all)
+        dsb     sy                              // ensure ordering with previous memory accesses
+        mrs     x0, clidr_el1                   // read clidr
+        and     x3, x0, #0x7000000              // extract loc from clidr
+        lsr     x3, x3, #23                     // left align loc bit field
+        cbz     x3, finished                    // if loc is 0, then no need to clean
+        mov     x10, #0                         // start clean at cache level 0
+loop1:
+        add     x2, x10, x10, lsr #1            // work out 3x current cache level
+        lsr     x1, x0, x2                      // extract cache type bits from clidr
+        and     x1, x1, #7                      // mask of the bits for current cache only
+        cmp     x1, #2                          // see what cache we have at this level
+        b.lt    skip                            // skip if no cache, or just i-cache
+        save_and_disable_irqs x9                // make CSSELR and CCSIDR access atomic
+        msr     csselr_el1, x10                 // select current cache level in csselr
+        isb                                     // isb to sych the new cssr&csidr
+        mrs     x1, ccsidr_el1                  // read the new ccsidr
+        restore_irqs x9
+        and     x2, x1, #7                      // extract the length of the cache lines
+        add     x2, x2, #4                      // add 4 (line length offset)
+        mov     x4, #0x3ff
+        and     x4, x4, x1, lsr #3              // find maximum number on the way size
+        clz     x5, x4                          // find bit position of way size increment
+        mov     x7, #0x7fff
+        and     x7, x7, x1, lsr #13             // extract max number of the index size
+loop2:
+        mov     x9, x4                          // create working copy of max way size
+loop3:
+        lsl     x6, x9, x5
+        orr     x11, x10, x6                    // factor way and cache number into x11
+        lsl     x6, x7, x2
+        orr     x11, x11, x6                    // factor index number into x11
+        dc      cisw, x11                       // clean & invalidate by set/way
+        subs    x9, x9, #1                      // decrement the way
+        b.ge    loop3
+        subs    x7, x7, #1                      // decrement the index
+        b.ge    loop2
+skip:
+        add     x10, x10, #2                    // increment cache number
+        cmp     x3, x10
+        b.gt    loop1
+finished:
+        mov     x10, #0                         // swith back to cache level 0
+        msr     csselr_el1, x10                 // select current cache level in csselr
+        dsb     sy
+        isb
+        ret
+ENDPROC(__flush_dcache_all)
+
+/*
+ *      flush_cache_all()
+ *
+ *      Flush the entire cache system.  The data cache flush is now achieved
+ *      using atomic clean / invalidates working outwards from L1 cache. This
+ *      is done using Set/Way based cache maintainance instructions.  The
+ *      instruction cache can still be invalidated back to the point of
+ *      unification in a single instruction.
+ */
+ENTRY(flush_cache_all)
+        mov     x12, lr
+        bl      __flush_dcache_all
+        mov     x0, #0
+        ic      ialluis                         // I+BTB cache invalidate
+        ret     x12
+ENDPROC(flush_cache_all)
+
+/*
+ *      flush_icache_range(start,end)
+ *
+ *      Ensure that the I and D caches are coherent within specified region.
+ *      This is typically used when code has been written to a memory region,
+ *      and will be executed.
+ *
+ *      - start   - virtual start address of region
+ *      - end     - virtual end address of region
+ */
+ENTRY(flush_icache_range)
+        /* FALLTHROUGH */
+
+/*
+ *      __flush_cache_user_range(start,end)
+ *
+ *      Ensure that the I and D caches are coherent within specified region.
+ *      This is typically used when code has been written to a memory region,
+ *      and will be executed.
+ *
+ *      - start   - virtual start address of region
+ *      - end     - virtual end address of region
+ */
+ENTRY(__flush_cache_user_range)
+        dcache_line_size x2, x3
+        sub     x3, x2, #1
+        bic     x4, x0, x3
+1:
+USER(9f, dc     cvau, x4        )               // clean D line to PoU
+        add     x4, x4, x2
+        cmp     x4, x1
+        b.lo    1b
+        dsb     sy
+
+        icache_line_size x2, x3
+        sub     x3, x2, #1
+        bic     x4, x0, x3
+1:
+USER(9f, ic     ivau, x4        )               // invalidate I line PoU
+        add     x4, x4, x2
+        cmp     x4, x1
+        b.lo    1b
+9:                                              // ignore any faulting cache operation
+        dsb     sy
+        isb
+        ret
+ENDPROC(flush_icache_range)
+ENDPROC(__flush_cache_user_range)
+
+/*
+ *      __flush_kern_dcache_page(kaddr)
+ *
+ *      Ensure that the data held in the page kaddr is written back to the
+ *      page in question.
+ *
+ *      - kaddr   - kernel address
+ *      - size    - size in question
+ */
+ENTRY(__flush_dcache_area)
+        dcache_line_size x2, x3
+        add     x1, x0, x1
+        sub     x3, x2, #1
+        bic     x0, x0, x3
+1:      dc      civac, x0                       // clean & invalidate D line / unified line
+        add     x0, x0, x2
+        cmp     x0, x1
+        b.lo    1b
+        dsb     sy
+        ret
+ENDPROC(__flush_dcache_area)
diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c
new file mode 100644
index 00000000000..baa758d3702
--- /dev/null
+++ b/arch/arm64/mm/context.c
@@ -0,0 +1,159 @@
+/*
+ * Based on arch/arm/mm/context.c
+ *
+ * Copyright (C) 2002-2003 Deep Blue Solutions Ltd, all rights reserved.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/percpu.h>
+
+#include <asm/mmu_context.h>
+#include <asm/tlbflush.h>
+#include <asm/cachetype.h>
+
+#define asid_bits(reg) \
+        (((read_cpuid(ID_AA64MMFR0_EL1) & 0xf0) >> 2) + 8)
+
+#define ASID_FIRST_VERSION      (1 << MAX_ASID_BITS)
+
+static DEFINE_RAW_SPINLOCK(cpu_asid_lock);
+unsigned int cpu_last_asid = ASID_FIRST_VERSION;
+
+/*
+ * We fork()ed a process, and we need a new context for the child to run in.
+ */
+void __init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+{
+        mm->context.id = 0;
+        raw_spin_lock_init(&mm->context.id_lock);
+}
+
+static void flush_context(void)
+{
+        /* set the reserved TTBR0 before flushing the TLB */
+        cpu_set_reserved_ttbr0();
+        flush_tlb_all();
+        if (icache_is_aivivt())
+                __flush_icache_all();
+}
+
+#ifdef CONFIG_SMP
+
+static void set_mm_context(struct mm_struct *mm, unsigned int asid)
+{
+        unsigned long flags;
+
+        /*
+         * Locking needed for multi-threaded applications where the same
+         * mm->context.id could be set from different CPUs during the
+         * broadcast. This function is also called via IPI so the
+         * mm->context.id_lock has to be IRQ-safe.
+         */
+        raw_spin_lock_irqsave(&mm->context.id_lock, flags);
+        if (likely((mm->context.id ^ cpu_last_asid) >> MAX_ASID_BITS)) {
+                /*
+                 * Old version of ASID found. Set the new one and reset
+                 * mm_cpumask(mm).
+                 */
+                mm->context.id = asid;
+                cpumask_clear(mm_cpumask(mm));
+        }
+        raw_spin_unlock_irqrestore(&mm->context.id_lock, flags);
+
+        /*
+         * Set the mm_cpumask(mm) bit for the current CPU.
+         */
+        cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
+}
+
+/*
+ * Reset the ASID on the current CPU. This function call is broadcast from the
+ * CPU handling the ASID rollover and holding cpu_asid_lock.
+ */
+static void reset_context(void *info)
+{
+        unsigned int asid;
+        unsigned int cpu = smp_processor_id();
+        struct mm_struct *mm = current->active_mm;
+
+        smp_rmb();
+        asid = cpu_last_asid + cpu;
+
+        flush_context();
+        set_mm_context(mm, asid);
+
+        /* set the new ASID */
+        cpu_switch_mm(mm->pgd, mm);
+}
+
+#else
+
+static inline void set_mm_context(struct mm_struct *mm, unsigned int asid)
+{
+        mm->context.id = asid;
+        cpumask_copy(mm_cpumask(mm), cpumask_of(smp_processor_id()));
+}
+
+#endif
+
+void __new_context(struct mm_struct *mm)
+{
+        unsigned int asid;
+        unsigned int bits = asid_bits();
+
+        raw_spin_lock(&cpu_asid_lock);
+#ifdef CONFIG_SMP
+        /*
+         * Check the ASID again, in case the change was broadcast from another
+         * CPU before we acquired the lock.
+         */
+        if (!unlikely((mm->context.id ^ cpu_last_asid) >> MAX_ASID_BITS)) {
+                cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
+                raw_spin_unlock(&cpu_asid_lock);
+                return;
+        }
+#endif
+        /*
+         * At this point, it is guaranteed that the current mm (with an old
+         * ASID) isn't active on any other CPU since the ASIDs are changed
+         * simultaneously via IPI.
+         */
+        asid = ++cpu_last_asid;
+
+        /*
+         * If we've used up all our ASIDs, we need to start a new version and
+         * flush the TLB.
+         */
+        if (unlikely((asid & ((1 << bits) - 1)) == 0)) {
+                /* increment the ASID version */
+                cpu_last_asid += (1 << MAX_ASID_BITS) - (1 << bits);
+                if (cpu_last_asid == 0)
+                        cpu_last_asid = ASID_FIRST_VERSION;
+                asid = cpu_last_asid + smp_processor_id();
+                flush_context();
+#ifdef CONFIG_SMP
+                smp_wmb();
+                smp_call_function(reset_context, NULL, 1);
+#endif
+                cpu_last_asid += NR_CPUS - 1;
+        }
+
+        set_mm_context(mm, asid);
+        raw_spin_unlock(&cpu_asid_lock);
+}
diff --git a/arch/arm64/mm/copypage.c b/arch/arm64/mm/copypage.c
new file mode 100644
index 00000000000..9aecbace412
--- /dev/null
+++ b/arch/arm64/mm/copypage.c
@@ -0,0 +1,34 @@
+/*
+ * Based on arch/arm/mm/copypage.c
+ *
+ * Copyright (C) 2002 Deep Blue Solutions Ltd, All Rights Reserved.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/mm.h>
+
+#include <asm/page.h>
+#include <asm/cacheflush.h>
+
+void __cpu_copy_user_page(void *kto, const void *kfrom, unsigned long vaddr)
+{
+        copy_page(kto, kfrom);
+        __flush_dcache_area(kto, PAGE_SIZE);
+}
+
+void __cpu_clear_user_page(void *kaddr, unsigned long vaddr)
+{
+        clear_page(kaddr);
+}
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
new file mode 100644
index 00000000000..5eb244453a5
--- /dev/null
+++ b/arch/arm64/mm/dma-mapping.c
@@ -0,0 +1,79 @@
+/*
+ * SWIOTLB-based DMA API implementation
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/gfp.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/vmalloc.h>
+#include <linux/swiotlb.h>
+
+#include <asm/cacheflush.h>
+
+struct dma_map_ops *dma_ops;
+EXPORT_SYMBOL(dma_ops);
+
+static void *arm64_swiotlb_alloc_coherent(struct device *dev, size_t size,
+                                          dma_addr_t *dma_handle, gfp_t flags,
+                                          struct dma_attrs *attrs)
+{
+        if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
+            dev->coherent_dma_mask <= DMA_BIT_MASK(32))
+                flags |= GFP_DMA32;
+        return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
+}
+
+static void arm64_swiotlb_free_coherent(struct device *dev, size_t size,
+                                        void *vaddr, dma_addr_t dma_handle,
+                                        struct dma_attrs *attrs)
+{
+        swiotlb_free_coherent(dev, size, vaddr, dma_handle);
+}
+
+static struct dma_map_ops arm64_swiotlb_dma_ops = {
+        .alloc = arm64_swiotlb_alloc_coherent,
+        .free = arm64_swiotlb_free_coherent,
+        .map_page = swiotlb_map_page,
+        .unmap_page = swiotlb_unmap_page,
+        .map_sg = swiotlb_map_sg_attrs,
+        .unmap_sg = swiotlb_unmap_sg_attrs,
+        .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
+        .sync_single_for_device = swiotlb_sync_single_for_device,
+        .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
+        .sync_sg_for_device = swiotlb_sync_sg_for_device,
+        .dma_supported = swiotlb_dma_supported,
+        .mapping_error = swiotlb_dma_mapping_error,
+};
+
+void __init swiotlb_init_with_default_size(size_t default_size, int verbose);
+
+void __init arm64_swiotlb_init(size_t max_size)
+{
+        dma_ops = &arm64_swiotlb_dma_ops;
+        swiotlb_init_with_default_size(min((size_t)SZ_64M, max_size), 1);
+}
+
+#define PREALLOC_DMA_DEBUG_ENTRIES      4096
+
+static int __init dma_debug_do_init(void)
+{
+        dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+        return 0;
+}
+fs_initcall(dma_debug_do_init);
diff --git a/arch/arm64/mm/extable.c b/arch/arm64/mm/extable.c
new file mode 100644
index 00000000000..79444279ba8
--- /dev/null
+++ b/arch/arm64/mm/extable.c
@@ -0,0 +1,17 @@
+/*
+ * Based on arch/arm/mm/extable.c
+ */
+
+#include <linux/module.h>
+#include <linux/uaccess.h>
+
+int fixup_exception(struct pt_regs *regs)
+{
+        const struct exception_table_entry *fixup;
+
+        fixup = search_exception_tables(instruction_pointer(regs));
+        if (fixup)
+                regs->pc = fixup->fixup;
+
+        return fixup != NULL;
+}
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
new file mode 100644
index 00000000000..1909a69983c
--- /dev/null
+++ b/arch/arm64/mm/fault.c
@@ -0,0 +1,534 @@
+/*
+ * Based on arch/arm/mm/fault.c
+ *
+ * Copyright (C) 1995  Linus Torvalds
+ * Copyright (C) 1995-2004 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/mm.h>
+#include <linux/hardirq.h>
+#include <linux/init.h>
+#include <linux/kprobes.h>
+#include <linux/uaccess.h>
+#include <linux/page-flags.h>
+#include <linux/sched.h>
+#include <linux/highmem.h>
+#include <linux/perf_event.h>
+
+#include <asm/exception.h>
+#include <asm/debug-monitors.h>
+#include <asm/system_misc.h>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+
+/*
+ * Dump out the page tables associated with 'addr' in mm 'mm'.
+ */
+void show_pte(struct mm_struct *mm, unsigned long addr)
+{
+        pgd_t *pgd;
+
+        if (!mm)
+                mm = &init_mm;
+
+        pr_alert("pgd = %p\n", mm->pgd);
+        pgd = pgd_offset(mm, addr);
+        pr_alert("[%08lx] *pgd=%016llx", addr, pgd_val(*pgd));
+
+        do {
+                pud_t *pud;
+                pmd_t *pmd;
+                pte_t *pte;
+
+                if (pgd_none_or_clear_bad(pgd))
+                        break;
+
+                pud = pud_offset(pgd, addr);
+                if (pud_none_or_clear_bad(pud))
+                        break;
+
+                pmd = pmd_offset(pud, addr);
+                printk(", *pmd=%016llx", pmd_val(*pmd));
+                if (pmd_none_or_clear_bad(pmd))
+                        break;
+
+                pte = pte_offset_map(pmd, addr);
+                printk(", *pte=%016llx", pte_val(*pte));
+                pte_unmap(pte);
+        } while(0);
+
+        printk("\n");
+}
+
+/*
+ * The kernel tried to access some page that wasn't present.
+ */
+static void __do_kernel_fault(struct mm_struct *mm, unsigned long addr,
+                              unsigned int esr, struct pt_regs *regs)
+{
+        /*
+         * Are we prepared to handle this kernel fault?
+         */
+        if (fixup_exception(regs))
+                return;
+
+        /*
+         * No handler, we'll have to terminate things with extreme prejudice.
+         */
+        bust_spinlocks(1);
+        pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
+                 (addr < PAGE_SIZE) ? "NULL pointer dereference" :
+                 "paging request", addr);
+
+        show_pte(mm, addr);
+        die("Oops", regs, esr);
+        bust_spinlocks(0);
+        do_exit(SIGKILL);
+}
+
+/*
+ * Something tried to access memory that isn't in our memory map. User mode
+ * accesses just cause a SIGSEGV
+ */
+static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
+                            unsigned int esr, unsigned int sig, int code,
+                            struct pt_regs *regs)
+{
+        struct siginfo si;
+
+        if (show_unhandled_signals) {
+                pr_info("%s[%d]: unhandled page fault (%d) at 0x%08lx, code 0x%03x\n",
+                        tsk->comm, task_pid_nr(tsk), sig, addr, esr);
+                show_pte(tsk->mm, addr);
+                show_regs(regs);
+        }
+
+        tsk->thread.fault_address = addr;
+        si.si_signo = sig;
+        si.si_errno = 0;
+        si.si_code = code;
+        si.si_addr = (void __user *)addr;
+        force_sig_info(sig, &si, tsk);
+}
+
+void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *regs)
+{
+        struct task_struct *tsk = current;
+        struct mm_struct *mm = tsk->active_mm;
+
+        /*
+         * If we are in kernel mode at this point, we have no context to
+         * handle this fault with.
+         */
+        if (user_mode(regs))
+                __do_user_fault(tsk, addr, esr, SIGSEGV, SEGV_MAPERR, regs);
+        else
+                __do_kernel_fault(mm, addr, esr, regs);
+}
+
+#define VM_FAULT_BADMAP         0x010000
+#define VM_FAULT_BADACCESS      0x020000
+
+#define ESR_WRITE               (1 << 6)
+#define ESR_LNX_EXEC            (1 << 24)
+
+/*
+ * Check that the permissions on the VMA allow for the fault which occurred.
+ * If we encountered a write fault, we must have write permission, otherwise
+ * we allow any permission.
+ */
+static inline bool access_error(unsigned int esr, struct vm_area_struct *vma)
+{
+        unsigned int mask = VM_READ | VM_WRITE | VM_EXEC;
+
+        if (esr & ESR_WRITE)
+                mask = VM_WRITE;
+        if (esr & ESR_LNX_EXEC)
+                mask = VM_EXEC;
+
+        return vma->vm_flags & mask ? false : true;
+}
+
+static int __do_page_fault(struct mm_struct *mm, unsigned long addr,
+                           unsigned int esr, unsigned int flags,
+                           struct task_struct *tsk)
+{
+        struct vm_area_struct *vma;
+        int fault;
+
+        vma = find_vma(mm, addr);
+        fault = VM_FAULT_BADMAP;
+        if (unlikely(!vma))
+                goto out;
+        if (unlikely(vma->vm_start > addr))
+                goto check_stack;
+
+        /*
+         * Ok, we have a good vm_area for this memory access, so we can handle
+         * it.
+         */
+good_area:
+        if (access_error(esr, vma)) {
+                fault = VM_FAULT_BADACCESS;
+                goto out;
+        }
+
+        return handle_mm_fault(mm, vma, addr & PAGE_MASK, flags);
+
+check_stack:
+        if (vma->vm_flags & VM_GROWSDOWN && !expand_stack(vma, addr))
+                goto good_area;
+out:
+        return fault;
+}
+
+static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
+                                   struct pt_regs *regs)
+{
+        struct task_struct *tsk;
+        struct mm_struct *mm;
+        int fault, sig, code;
+        int write = esr & ESR_WRITE;
+        unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE |
+                (write ? FAULT_FLAG_WRITE : 0);
+
+        tsk = current;
+        mm  = tsk->mm;
+
+        /* Enable interrupts if they were enabled in the parent context. */
+        if (interrupts_enabled(regs))
+                local_irq_enable();
+
+        /*
+         * If we're in an interrupt or have no user context, we must not take
+         * the fault.
+         */
+        if (in_atomic() || !mm)
+                goto no_context;
+
+        /*
+         * As per x86, we may deadlock here. However, since the kernel only
+         * validly references user space from well defined areas of the code,
+         * we can bug out early if this is from code which shouldn't.
+         */
+        if (!down_read_trylock(&mm->mmap_sem)) {
+                if (!user_mode(regs) && !search_exception_tables(regs->pc))
+                        goto no_context;
+retry:
+                down_read(&mm->mmap_sem);
+        } else {
+                /*
+                 * The above down_read_trylock() might have succeeded in which
+                 * case, we'll have missed the might_sleep() from down_read().
+                 */
+                might_sleep();
+#ifdef CONFIG_DEBUG_VM
+                if (!user_mode(regs) && !search_exception_tables(regs->pc))
+                        goto no_context;
+#endif
+        }
+
+        fault = __do_page_fault(mm, addr, esr, flags, tsk);
+
+        /*
+         * If we need to retry but a fatal signal is pending, handle the
+         * signal first. We do not need to release the mmap_sem because it
+         * would already be released in __lock_page_or_retry in mm/filemap.c.
+         */
+        if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
+                return 0;
+
+        /*
+         * Major/minor page fault accounting is only done on the initial
+         * attempt. If we go through a retry, it is extremely likely that the
+         * page will be found in page cache at that point.
+         */
+
+        perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr);
+        if (flags & FAULT_FLAG_ALLOW_RETRY) {
+                if (fault & VM_FAULT_MAJOR) {
+                        tsk->maj_flt++;
+                        perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs,
+                                      addr);
+                } else {
+                        tsk->min_flt++;
+                        perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs,
+                                      addr);
+                }
+                if (fault & VM_FAULT_RETRY) {
+                        /*
+                         * Clear FAULT_FLAG_ALLOW_RETRY to avoid any risk of
+                         * starvation.
+                         */
+                        flags &= ~FAULT_FLAG_ALLOW_RETRY;
+                        goto retry;
+                }
+        }
+
+        up_read(&mm->mmap_sem);
+
+        /*
+         * Handle the "normal" case first - VM_FAULT_MAJOR / VM_FAULT_MINOR
+         */
+        if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP |
+                              VM_FAULT_BADACCESS))))
+                return 0;
+
+        if (fault & VM_FAULT_OOM) {
+                /*
+                 * We ran out of memory, call the OOM killer, and return to
+                 * userspace (which will retry the fault, or kill us if we got
+                 * oom-killed).
+                 */
+                pagefault_out_of_memory();
+                return 0;
+        }
+
+        /*
+         * If we are in kernel mode at this point, we have no context to
+         * handle this fault with.
+         */
+        if (!user_mode(regs))
+                goto no_context;
+
+        if (fault & VM_FAULT_SIGBUS) {
+                /*
+                 * We had some memory, but were unable to successfully fix up
+                 * this page fault.
+                 */
+                sig = SIGBUS;
+                code = BUS_ADRERR;
+        } else {
+                /*
+                 * Something tried to access memory that isn't in our memory
+                 * map.
+                 */
+                sig = SIGSEGV;
+                code = fault == VM_FAULT_BADACCESS ?
+                        SEGV_ACCERR : SEGV_MAPERR;
+        }
+
+        __do_user_fault(tsk, addr, esr, sig, code, regs);
+        return 0;
+
+no_context:
+        __do_kernel_fault(mm, addr, esr, regs);
+        return 0;
+}
+
+/*
+ * First Level Translation Fault Handler
+ *
+ * We enter here because the first level page table doesn't contain a valid
+ * entry for the address.
+ *
+ * If the address is in kernel space (>= TASK_SIZE), then we are probably
+ * faulting in the vmalloc() area.
+ *
+ * If the init_task's first level page tables contains the relevant entry, we
+ * copy the it to this task.  If not, we send the process a signal, fixup the
+ * exception, or oops the kernel.
+ *
+ * NOTE! We MUST NOT take any locks for this case. We may be in an interrupt
+ * or a critical region, and should only copy the information from the master
+ * page table, nothing more.
+ */
+static int __kprobes do_translation_fault(unsigned long addr,
+                                          unsigned int esr,
+                                          struct pt_regs *regs)
+{
+        if (addr < TASK_SIZE)
+                return do_page_fault(addr, esr, regs);
+
+        do_bad_area(addr, esr, regs);
+        return 0;
+}
+
+/*
+ * Some section permission faults need to be handled gracefully.  They can
+ * happen due to a __{get,put}_user during an oops.
+ */
+static int do_sect_fault(unsigned long addr, unsigned int esr,
+                         struct pt_regs *regs)
+{
+        do_bad_area(addr, esr, regs);
+        return 0;
+}
+
+/*
+ * This abort handler always returns "fault".
+ */
+static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
+{
+        return 1;
+}
+
+static struct fault_info {
+        int     (*fn)(unsigned long addr, unsigned int esr, struct pt_regs *regs);
+        int     sig;
+        int     code;
+        const char *name;
+} fault_info[] = {
+        { do_bad,               SIGBUS,  0,             "ttbr address size fault"       },
+        { do_bad,               SIGBUS,  0,             "level 1 address size fault"    },
+        { do_bad,               SIGBUS,  0,             "level 2 address size fault"    },
+        { do_bad,               SIGBUS,  0,             "level 3 address size fault"    },
+        { do_translation_fault, SIGSEGV, SEGV_MAPERR,   "input address range fault"     },
+        { do_translation_fault, SIGSEGV, SEGV_MAPERR,   "level 1 translation fault"     },
+        { do_translation_fault, SIGSEGV, SEGV_MAPERR,   "level 2 translation fault"     },
+        { do_page_fault,        SIGSEGV, SEGV_MAPERR,   "level 3 translation fault"     },
+        { do_bad,               SIGBUS,  0,             "reserved access flag fault"    },
+        { do_bad,               SIGSEGV, SEGV_ACCERR,   "level 1 access flag fault"     },
+        { do_bad,               SIGSEGV, SEGV_ACCERR,   "level 2 access flag fault"     },
+        { do_page_fault,        SIGSEGV, SEGV_ACCERR,   "level 3 access flag fault"     },
+        { do_bad,               SIGBUS,  0,             "reserved permission fault"     },
+        { do_bad,               SIGSEGV, SEGV_ACCERR,   "level 1 permission fault"      },
+        { do_sect_fault,        SIGSEGV, SEGV_ACCERR,   "level 2 permission fault"      },
+        { do_page_fault,        SIGSEGV, SEGV_ACCERR,   "level 3 permission fault"      },
+        { do_bad,               SIGBUS,  0,             "synchronous external abort"    },
+        { do_bad,               SIGBUS,  0,             "asynchronous external abort"   },
+        { do_bad,               SIGBUS,  0,             "unknown 18"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 19"                    },
+        { do_bad,               SIGBUS,  0,             "synchronous abort (translation table walk)" },
+        { do_bad,               SIGBUS,  0,             "synchronous abort (translation table walk)" },
+        { do_bad,               SIGBUS,  0,             "synchronous abort (translation table walk)" },
+        { do_bad,               SIGBUS,  0,             "synchronous abort (translation table walk)" },
+        { do_bad,               SIGBUS,  0,             "synchronous parity error"      },
+        { do_bad,               SIGBUS,  0,             "asynchronous parity error"     },
+        { do_bad,               SIGBUS,  0,             "unknown 26"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 27"                    },
+        { do_bad,               SIGBUS,  0,             "synchronous parity error (translation table walk" },
+        { do_bad,               SIGBUS,  0,             "synchronous parity error (translation table walk" },
+        { do_bad,               SIGBUS,  0,             "synchronous parity error (translation table walk" },
+        { do_bad,               SIGBUS,  0,             "synchronous parity error (translation table walk" },
+        { do_bad,               SIGBUS,  0,             "unknown 32"                    },
+        { do_bad,               SIGBUS,  BUS_ADRALN,    "alignment fault"               },
+        { do_bad,               SIGBUS,  0,             "debug event"                   },
+        { do_bad,               SIGBUS,  0,             "unknown 35"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 36"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 37"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 38"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 39"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 40"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 41"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 42"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 43"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 44"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 45"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 46"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 47"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 48"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 49"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 50"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 51"                    },
+        { do_bad,               SIGBUS,  0,             "implementation fault (lockdown abort)" },
+        { do_bad,               SIGBUS,  0,             "unknown 53"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 54"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 55"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 56"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 57"                    },
+        { do_bad,               SIGBUS,  0,             "implementation fault (coprocessor abort)" },
+        { do_bad,               SIGBUS,  0,             "unknown 59"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 60"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 61"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 62"                    },
+        { do_bad,               SIGBUS,  0,             "unknown 63"                    },
+};
+
+/*
+ * Dispatch a data abort to the relevant handler.
+ */
+asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
+                                         struct pt_regs *regs)
+{
+        const struct fault_info *inf = fault_info + (esr & 63);
+        struct siginfo info;
+
+        if (!inf->fn(addr, esr, regs))
+                return;
+
+        pr_alert("Unhandled fault: %s (0x%08x) at 0x%016lx\n",
+                 inf->name, esr, addr);
+
+        info.si_signo = inf->sig;
+        info.si_errno = 0;
+        info.si_code  = inf->code;
+        info.si_addr  = (void __user *)addr;
+        arm64_notify_die("", regs, &info, esr);
+}
+
+/*
+ * Handle stack alignment exceptions.
+ */
+asmlinkage void __exception do_sp_pc_abort(unsigned long addr,
+                                           unsigned int esr,
+                                           struct pt_regs *regs)
+{
+        struct siginfo info;
+
+        info.si_signo = SIGBUS;
+        info.si_errno = 0;
+        info.si_code  = BUS_ADRALN;
+        info.si_addr  = (void __user *)addr;
+        arm64_notify_die("", regs, &info, esr);
+}
+
+static struct fault_info debug_fault_info[] = {
+        { do_bad,       SIGTRAP,        TRAP_HWBKPT,    "hardware breakpoint"   },
+        { do_bad,       SIGTRAP,        TRAP_HWBKPT,    "hardware single-step"  },
+        { do_bad,       SIGTRAP,        TRAP_HWBKPT,    "hardware watchpoint"   },
+        { do_bad,       SIGBUS,         0,              "unknown 3"             },
+        { do_bad,       SIGTRAP,        TRAP_BRKPT,     "aarch32 BKPT"          },
+        { do_bad,       SIGTRAP,        0,              "aarch32 vector catch"  },
+        { do_bad,       SIGTRAP,        TRAP_BRKPT,     "aarch64 BRK"           },
+        { do_bad,       SIGBUS,         0,              "unknown 7"             },
+};
+
+void __init hook_debug_fault_code(int nr,
+                                  int (*fn)(unsigned long, unsigned int, struct pt_regs *),
+                                  int sig, int code, const char *name)
+{
+        BUG_ON(nr < 0 || nr >= ARRAY_SIZE(debug_fault_info));
+
+        debug_fault_info[nr].fn         = fn;
+        debug_fault_info[nr].sig        = sig;
+        debug_fault_info[nr].code       = code;
+        debug_fault_info[nr].name       = name;
+}
+
+asmlinkage int __exception do_debug_exception(unsigned long addr,
+                                              unsigned int esr,
+                                              struct pt_regs *regs)
+{
+        const struct fault_info *inf = debug_fault_info + DBG_ESR_EVT(esr);
+        struct siginfo info;
+
+        if (!inf->fn(addr, esr, regs))
+                return 1;
+
+        pr_alert("Unhandled debug exception: %s (0x%08x) at 0x%016lx\n",
+                 inf->name, esr, addr);
+
+        info.si_signo = inf->sig;
+        info.si_errno = 0;
+        info.si_code  = inf->code;
+        info.si_addr  = (void __user *)addr;
+        arm64_notify_die("", regs, &info, esr);
+
+        return 0;
+}
diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
new file mode 100644
index 00000000000..c144adb1682
--- /dev/null
+++ b/arch/arm64/mm/flush.c
@@ -0,0 +1,135 @@
+/*
+ * Based on arch/arm/mm/flush.c
+ *
+ * Copyright (C) 1995-2002 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/export.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+
+#include <asm/cacheflush.h>
+#include <asm/cachetype.h>
+#include <asm/tlbflush.h>
+
+#include "mm.h"
+
+void flush_cache_mm(struct mm_struct *mm)
+{
+}
+
+void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
+                       unsigned long end)
+{
+        if (vma->vm_flags & VM_EXEC)
+                __flush_icache_all();
+}
+
+void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr,
+                      unsigned long pfn)
+{
+}
+
+static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
+                                unsigned long uaddr, void *kaddr,
+                                unsigned long len)
+{
+        if (vma->vm_flags & VM_EXEC) {
+                unsigned long addr = (unsigned long)kaddr;
+                if (icache_is_aliasing()) {
+                        __flush_dcache_area(kaddr, len);
+                        __flush_icache_all();
+                } else {
+                        flush_icache_range(addr, addr + len);
+                }
+        }
+}
+
+/*
+ * Copy user data from/to a page which is mapped into a different processes
+ * address space.  Really, we want to allow our "user space" model to handle
+ * this.
+ *
+ * Note that this code needs to run on the current CPU.
+ */
+void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
+                       unsigned long uaddr, void *dst, const void *src,
+                       unsigned long len)
+{
+#ifdef CONFIG_SMP
+        preempt_disable();
+#endif
+        memcpy(dst, src, len);
+        flush_ptrace_access(vma, page, uaddr, dst, len);
+#ifdef CONFIG_SMP
+        preempt_enable();
+#endif
+}
+
+void __flush_dcache_page(struct page *page)
+{
+        __flush_dcache_area(page_address(page), PAGE_SIZE);
+}
+
+void __sync_icache_dcache(pte_t pte, unsigned long addr)
+{
+        unsigned long pfn;
+        struct page *page;
+
+        pfn = pte_pfn(pte);
+        if (!pfn_valid(pfn))
+                return;
+
+        page = pfn_to_page(pfn);
+        if (!test_and_set_bit(PG_dcache_clean, &page->flags)) {
+                __flush_dcache_page(page);
+                __flush_icache_all();
+        } else if (icache_is_aivivt()) {
+                __flush_icache_all();
+        }
+}
+
+/*
+ * Ensure cache coherency between kernel mapping and userspace mapping of this
+ * page.
+ */
+void flush_dcache_page(struct page *page)
+{
+        struct address_space *mapping;
+
+        /*
+         * The zero page is never written to, so never has any dirty cache
+         * lines, and therefore never needs to be flushed.
+         */
+        if (page == ZERO_PAGE(0))
+                return;
+
+        mapping = page_mapping(page);
+        if (mapping && mapping_mapped(mapping)) {
+                __flush_dcache_page(page);
+                __flush_icache_all();
+                set_bit(PG_dcache_clean, &page->flags);
+        } else {
+                clear_bit(PG_dcache_clean, &page->flags);
+        }
+}
+EXPORT_SYMBOL(flush_dcache_page);
+
+/*
+ * Additional functions defined in assembly.
+ */
+EXPORT_SYMBOL(flush_cache_all);
+EXPORT_SYMBOL(flush_icache_range);
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
new file mode 100644
index 00000000000..5f719ba949b
--- /dev/null
+++ b/arch/arm64/mm/init.c
@@ -0,0 +1,437 @@
+/*
+ * Based on arch/arm/mm/init.c
+ *
+ * Copyright (C) 1995-2005 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/errno.h>
+#include <linux/swap.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/mman.h>
+#include <linux/nodemask.h>
+#include <linux/initrd.h>
+#include <linux/gfp.h>
+#include <linux/memblock.h>
+#include <linux/sort.h>
+#include <linux/of_fdt.h>
+
+#include <asm/prom.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/sizes.h>
+#include <asm/tlb.h>
+
+#include "mm.h"
+
+static unsigned long phys_initrd_start __initdata = 0;
+static unsigned long phys_initrd_size __initdata = 0;
+
+phys_addr_t memstart_addr __read_mostly = 0;
+
+void __init early_init_dt_setup_initrd_arch(unsigned long start,
+                                            unsigned long end)
+{
+        phys_initrd_start = start;
+        phys_initrd_size = end - start;
+}
+
+static int __init early_initrd(char *p)
+{
+        unsigned long start, size;
+        char *endp;
+
+        start = memparse(p, &endp);
+        if (*endp == ',') {
+                size = memparse(endp + 1, NULL);
+
+                phys_initrd_start = start;
+                phys_initrd_size = size;
+        }
+        return 0;
+}
+early_param("initrd", early_initrd);
+
+#define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT)
+
+static void __init zone_sizes_init(unsigned long min, unsigned long max)
+{
+        struct memblock_region *reg;
+        unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
+        unsigned long max_dma32 = min;
+
+        memset(zone_size, 0, sizeof(zone_size));
+
+#ifdef CONFIG_ZONE_DMA32
+        /* 4GB maximum for 32-bit only capable devices */
+        max_dma32 = min(max, MAX_DMA32_PFN);
+        zone_size[ZONE_DMA32] = max_dma32 - min;
+#endif
+        zone_size[ZONE_NORMAL] = max - max_dma32;
+
+        memcpy(zhole_size, zone_size, sizeof(zhole_size));
+
+        for_each_memblock(memory, reg) {
+                unsigned long start = memblock_region_memory_base_pfn(reg);
+                unsigned long end = memblock_region_memory_end_pfn(reg);
+
+                if (start >= max)
+                        continue;
+#ifdef CONFIG_ZONE_DMA32
+                if (start < max_dma32) {
+                        unsigned long dma_end = min(end, max_dma32);
+                        zhole_size[ZONE_DMA32] -= dma_end - start;
+                }
+#endif
+                if (end > max_dma32) {
+                        unsigned long normal_end = min(end, max);
+                        unsigned long normal_start = max(start, max_dma32);
+                        zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
+                }
+        }
+
+        free_area_init_node(0, zone_size, min, zhole_size);
+}
+
+#ifdef CONFIG_HAVE_ARCH_PFN_VALID
+int pfn_valid(unsigned long pfn)
+{
+        return memblock_is_memory(pfn << PAGE_SHIFT);
+}
+EXPORT_SYMBOL(pfn_valid);
+#endif
+
+#ifndef CONFIG_SPARSEMEM
+static void arm64_memory_present(void)
+{
+}
+#else
+static void arm64_memory_present(void)
+{
+        struct memblock_region *reg;
+
+        for_each_memblock(memory, reg)
+                memory_present(0, memblock_region_memory_base_pfn(reg),
+                               memblock_region_memory_end_pfn(reg));
+}
+#endif
+
+void __init arm64_memblock_init(void)
+{
+        u64 *reserve_map, base, size;
+
+        /* Register the kernel text, kernel data and initrd with memblock */
+        memblock_reserve(__pa(_text), _end - _text);
+#ifdef CONFIG_BLK_DEV_INITRD
+        if (phys_initrd_size) {
+                memblock_reserve(phys_initrd_start, phys_initrd_size);
+
+                /* Now convert initrd to virtual addresses */
+                initrd_start = __phys_to_virt(phys_initrd_start);
+                initrd_end = initrd_start + phys_initrd_size;
+        }
+#endif
+
+        /*
+         * Reserve the page tables.  These are already in use,
+         * and can only be in node 0.
+         */
+        memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE);
+        memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);
+
+        /* Reserve the dtb region */
+        memblock_reserve(virt_to_phys(initial_boot_params),
+                         be32_to_cpu(initial_boot_params->totalsize));
+
+        /*
+         * Process the reserve map.  This will probably overlap the initrd
+         * and dtb locations which are already reserved, but overlapping
+         * doesn't hurt anything
+         */
+        reserve_map = ((void*)initial_boot_params) +
+                        be32_to_cpu(initial_boot_params->off_mem_rsvmap);
+        while (1) {
+                base = be64_to_cpup(reserve_map++);
+                size = be64_to_cpup(reserve_map++);
+                if (!size)
+                        break;
+                memblock_reserve(base, size);
+        }
+
+        memblock_allow_resize();
+        memblock_dump_all();
+}
+
+void __init bootmem_init(void)
+{
+        unsigned long min, max;
+
+        min = PFN_UP(memblock_start_of_DRAM());
+        max = PFN_DOWN(memblock_end_of_DRAM());
+
+        /*
+         * Sparsemem tries to allocate bootmem in memory_present(), so must be
+         * done after the fixed reservations.
+         */
+        arm64_memory_present();
+
+        sparse_init();
+        zone_sizes_init(min, max);
+
+        high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
+        max_pfn = max_low_pfn = max;
+}
+
+static inline int free_area(unsigned long pfn, unsigned long end, char *s)
+{
+        unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
+
+        for (; pfn < end; pfn++) {
+                struct page *page = pfn_to_page(pfn);
+                ClearPageReserved(page);
+                init_page_count(page);
+                __free_page(page);
+                pages++;
+        }
+
+        if (size && s)
+                pr_info("Freeing %s memory: %dK\n", s, size);
+
+        return pages;
+}
+
+/*
+ * Poison init memory with an undefined instruction (0x0).
+ */
+static inline void poison_init_mem(void *s, size_t count)
+{
+        memset(s, 0, count);
+}
+
+#ifndef CONFIG_SPARSEMEM_VMEMMAP
+static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
+{
+        struct page *start_pg, *end_pg;
+        unsigned long pg, pgend;
+
+        /*
+         * Convert start_pfn/end_pfn to a struct page pointer.
+         */
+        start_pg = pfn_to_page(start_pfn - 1) + 1;
+        end_pg = pfn_to_page(end_pfn - 1) + 1;
+
+        /*
+         * Convert to physical addresses, and round start upwards and end
+         * downwards.
+         */
+        pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
+        pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
+
+        /*
+         * If there are free pages between these, free the section of the
+         * memmap array.
+         */
+        if (pg < pgend)
+                free_bootmem(pg, pgend - pg);
+}
+
+/*
+ * The mem_map array can get very big. Free the unused area of the memory map.
+ */
+static void __init free_unused_memmap(void)
+{
+        unsigned long start, prev_end = 0;
+        struct memblock_region *reg;
+
+        for_each_memblock(memory, reg) {
+                start = __phys_to_pfn(reg->base);
+
+#ifdef CONFIG_SPARSEMEM
+                /*
+                 * Take care not to free memmap entries that don't exist due
+                 * to SPARSEMEM sections which aren't present.
+                 */
+                start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
+#endif
+                /*
+                 * If we had a previous bank, and there is a space between the
+                 * current bank and the previous, free it.
+                 */
+                if (prev_end && prev_end < start)
+                        free_memmap(prev_end, start);
+
+                /*
+                 * Align up here since the VM subsystem insists that the
+                 * memmap entries are valid from the bank end aligned to
+                 * MAX_ORDER_NR_PAGES.
+                 */
+                prev_end = ALIGN(start + __phys_to_pfn(reg->size),
+                                 MAX_ORDER_NR_PAGES);
+        }
+
+#ifdef CONFIG_SPARSEMEM
+        if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
+                free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
+#endif
+}
+#endif  /* !CONFIG_SPARSEMEM_VMEMMAP */
+
+/*
+ * mem_init() marks the free areas in the mem_map and tells us how much memory
+ * is free.  This is done after various parts of the system have claimed their
+ * memory after the kernel image.
+ */
+void __init mem_init(void)
+{
+        unsigned long reserved_pages, free_pages;
+        struct memblock_region *reg;
+
+#if CONFIG_SWIOTLB
+        extern void __init arm64_swiotlb_init(size_t max_size);
+        arm64_swiotlb_init(max_pfn << (PAGE_SHIFT - 1));
+#endif
+
+        max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
+
+#ifndef CONFIG_SPARSEMEM_VMEMMAP
+        /* this will put all unused low memory onto the freelists */
+        free_unused_memmap();
+#endif
+
+        totalram_pages += free_all_bootmem();
+
+        reserved_pages = free_pages = 0;
+
+        for_each_memblock(memory, reg) {
+                unsigned int pfn1, pfn2;
+                struct page *page, *end;
+
+                pfn1 = __phys_to_pfn(reg->base);
+                pfn2 = pfn1 + __phys_to_pfn(reg->size);
+
+                page = pfn_to_page(pfn1);
+                end  = pfn_to_page(pfn2 - 1) + 1;
+
+                do {
+                        if (PageReserved(page))
+                                reserved_pages++;
+                        else if (!page_count(page))
+                                free_pages++;
+                        page++;
+                } while (page < end);
+        }
+
+        /*
+         * Since our memory may not be contiguous, calculate the real number
+         * of pages we have in this system.
+         */
+        pr_info("Memory:");
+        num_physpages = 0;
+        for_each_memblock(memory, reg) {
+                unsigned long pages = memblock_region_memory_end_pfn(reg) -
+                        memblock_region_memory_base_pfn(reg);
+                num_physpages += pages;
+                printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
+        }
+        printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
+
+        pr_notice("Memory: %luk/%luk available, %luk reserved\n",
+                  nr_free_pages() << (PAGE_SHIFT-10),
+                  free_pages << (PAGE_SHIFT-10),
+                  reserved_pages << (PAGE_SHIFT-10));
+
+#define MLK(b, t) b, t, ((t) - (b)) >> 10
+#define MLM(b, t) b, t, ((t) - (b)) >> 20
+#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
+
+        pr_notice("Virtual kernel memory layout:\n"
+                  "    vmalloc : 0x%16lx - 0x%16lx   (%6ld MB)\n"
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+                  "    vmemmap : 0x%16lx - 0x%16lx   (%6ld MB)\n"
+#endif
+                  "    modules : 0x%16lx - 0x%16lx   (%6ld MB)\n"
+                  "    memory  : 0x%16lx - 0x%16lx   (%6ld MB)\n"
+                  "      .init : 0x%p" " - 0x%p" "   (%6ld kB)\n"
+                  "      .text : 0x%p" " - 0x%p" "   (%6ld kB)\n"
+                  "      .data : 0x%p" " - 0x%p" "   (%6ld kB)\n",
+                  MLM(VMALLOC_START, VMALLOC_END),
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+                  MLM((unsigned long)virt_to_page(PAGE_OFFSET),
+                      (unsigned long)virt_to_page(high_memory)),
+#endif
+                  MLM(MODULES_VADDR, MODULES_END),
+                  MLM(PAGE_OFFSET, (unsigned long)high_memory),
+
+                  MLK_ROUNDUP(__init_begin, __init_end),
+                  MLK_ROUNDUP(_text, _etext),
+                  MLK_ROUNDUP(_sdata, _edata));
+
+#undef MLK
+#undef MLM
+#undef MLK_ROUNDUP
+
+        /*
+         * Check boundaries twice: Some fundamental inconsistencies can be
+         * detected at build time already.
+         */
+#ifdef CONFIG_COMPAT
+        BUILD_BUG_ON(TASK_SIZE_32                       > TASK_SIZE_64);
+#endif
+        BUILD_BUG_ON(TASK_SIZE_64                       > MODULES_VADDR);
+        BUG_ON(TASK_SIZE_64                             > MODULES_VADDR);
+
+        if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
+                extern int sysctl_overcommit_memory;
+                /*
+                 * On a machine this small we won't get anywhere without
+                 * overcommit, so turn it on by default.
+                 */
+                sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
+        }
+}
+
+void free_initmem(void)
+{
+        poison_init_mem(__init_begin, __init_end - __init_begin);
+        totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
+                                    __phys_to_pfn(__pa(__init_end)),
+                                    "init");
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+
+static int keep_initrd;
+
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+        if (!keep_initrd) {
+                poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
+                totalram_pages += free_area(__phys_to_pfn(__pa(start)),
+                                            __phys_to_pfn(__pa(end)),
+                                            "initrd");
+        }
+}
+
+static int __init keepinitrd_setup(char *__unused)
+{
+        keep_initrd = 1;
+        return 1;
+}
+
+__setup("keepinitrd", keepinitrd_setup);
+#endif
diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c
new file mode 100644
index 00000000000..1725cd6db37
--- /dev/null
+++ b/arch/arm64/mm/ioremap.c
@@ -0,0 +1,84 @@
+/*
+ * Based on arch/arm/mm/ioremap.c
+ *
+ * (C) Copyright 1995 1996 Linus Torvalds
+ * Hacked for ARM by Phil Blundell <philb@gnu.org>
+ * Hacked to allow all architectures to build, and various cleanups
+ * by Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/export.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <linux/io.h>
+
+static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size,
+                                      pgprot_t prot, void *caller)
+{
+        unsigned long last_addr;
+        unsigned long offset = phys_addr & ~PAGE_MASK;
+        int err;
+        unsigned long addr;
+        struct vm_struct *area;
+
+        /*
+         * Page align the mapping address and size, taking account of any
+         * offset.
+         */
+        phys_addr &= PAGE_MASK;
+        size = PAGE_ALIGN(size + offset);
+
+        /*
+         * Don't allow wraparound, zero size or outside PHYS_MASK.
+         */
+        last_addr = phys_addr + size - 1;
+        if (!size || last_addr < phys_addr || (last_addr & ~PHYS_MASK))
+                return NULL;
+
+        /*
+         * Don't allow RAM to be mapped.
+         */
+        if (WARN_ON(pfn_valid(__phys_to_pfn(phys_addr))))
+                return NULL;
+
+        area = get_vm_area_caller(size, VM_IOREMAP, caller);
+        if (!area)
+                return NULL;
+        addr = (unsigned long)area->addr;
+
+        err = ioremap_page_range(addr, addr + size, phys_addr, prot);
+        if (err) {
+                vunmap((void *)addr);
+                return NULL;
+        }
+
+        return (void __iomem *)(offset + addr);
+}
+
+void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot)
+{
+        return __ioremap_caller(phys_addr, size, prot,
+                                __builtin_return_address(0));
+}
+EXPORT_SYMBOL(__ioremap);
+
+void __iounmap(volatile void __iomem *io_addr)
+{
+        void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
+
+        vunmap(addr);
+}
+EXPORT_SYMBOL(__iounmap);
diff --git a/arch/arm64/mm/mm.h b/arch/arm64/mm/mm.h
new file mode 100644
index 00000000000..d8d6e7851c1
--- /dev/null
+++ b/arch/arm64/mm/mm.h
@@ -0,0 +1,2 @@
+extern void __flush_dcache_page(struct page *page);
+extern void __init bootmem_init(void);
diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c
new file mode 100644
index 00000000000..7c7be785563
--- /dev/null
+++ b/arch/arm64/mm/mmap.c
@@ -0,0 +1,144 @@
+/*
+ * Based on arch/arm/mm/mmap.c
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/elf.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/export.h>
+#include <linux/shm.h>
+#include <linux/sched.h>
+#include <linux/io.h>
+#include <linux/personality.h>
+#include <linux/random.h>
+
+#include <asm/cputype.h>
+
+/*
+ * Leave enough space between the mmap area and the stack to honour ulimit in
+ * the face of randomisation.
+ */
+#define MIN_GAP (SZ_128M + ((STACK_RND_MASK << PAGE_SHIFT) + 1))
+#define MAX_GAP (STACK_TOP/6*5)
+
+static int mmap_is_legacy(void)
+{
+        if (current->personality & ADDR_COMPAT_LAYOUT)
+                return 1;
+
+        if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
+                return 1;
+
+        return sysctl_legacy_va_layout;
+}
+
+/*
+ * Since get_random_int() returns the same value within a 1 jiffy window, we
+ * will almost always get the same randomisation for the stack and mmap
+ * region. This will mean the relative distance between stack and mmap will be
+ * the same.
+ *
+ * To avoid this we can shift the randomness by 1 bit.
+ */
+static unsigned long mmap_rnd(void)
+{
+        unsigned long rnd = 0;
+
+        if (current->flags & PF_RANDOMIZE)
+                rnd = (long)get_random_int() & (STACK_RND_MASK >> 1);
+
+        return rnd << (PAGE_SHIFT + 1);
+}
+
+static unsigned long mmap_base(void)
+{
+        unsigned long gap = rlimit(RLIMIT_STACK);
+
+        if (gap < MIN_GAP)
+                gap = MIN_GAP;
+        else if (gap > MAX_GAP)
+                gap = MAX_GAP;
+
+        return PAGE_ALIGN(STACK_TOP - gap - mmap_rnd());
+}
+
+/*
+ * This function, called very early during the creation of a new process VM
+ * image, sets up which VM layout function to use:
+ */
+void arch_pick_mmap_layout(struct mm_struct *mm)
+{
+        /*
+         * Fall back to the standard layout if the personality bit is set, or
+         * if the expected stack growth is unlimited:
+         */
+        if (mmap_is_legacy()) {
+                mm->mmap_base = TASK_UNMAPPED_BASE;
+                mm->get_unmapped_area = arch_get_unmapped_area;
+                mm->unmap_area = arch_unmap_area;
+        } else {
+                mm->mmap_base = mmap_base();
+                mm->get_unmapped_area = arch_get_unmapped_area_topdown;
+                mm->unmap_area = arch_unmap_area_topdown;
+        }
+}
+EXPORT_SYMBOL_GPL(arch_pick_mmap_layout);
+
+
+/*
+ * You really shouldn't be using read() or write() on /dev/mem.  This might go
+ * away in the future.
+ */
+int valid_phys_addr_range(unsigned long addr, size_t size)
+{
+        if (addr < PHYS_OFFSET)
+                return 0;
+        if (addr + size > __pa(high_memory - 1) + 1)
+                return 0;
+
+        return 1;
+}
+
+/*
+ * Do not allow /dev/mem mappings beyond the supported physical range.
+ */
+int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
+{
+        return !(((pfn << PAGE_SHIFT) + size) & ~PHYS_MASK);
+}
+
+#ifdef CONFIG_STRICT_DEVMEM
+
+#include <linux/ioport.h>
+
+/*
+ * devmem_is_allowed() checks to see if /dev/mem access to a certain address
+ * is valid. The argument is a physical page number.  We mimic x86 here by
+ * disallowing access to system RAM as well as device-exclusive MMIO regions.
+ * This effectively disable read()/write() on /dev/mem.
+ */
+int devmem_is_allowed(unsigned long pfn)
+{
+        if (iomem_is_exclusive(pfn << PAGE_SHIFT))
+                return 0;
+        if (!page_is_ram(pfn))
+                return 1;
+        return 0;
+}
+
+#endif
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
new file mode 100644
index 00000000000..a6885d896ab
--- /dev/null
+++ b/arch/arm64/mm/mmu.c
@@ -0,0 +1,395 @@
+/*
+ * Based on arch/arm/mm/mmu.c
+ *
+ * Copyright (C) 1995-2005 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/mman.h>
+#include <linux/nodemask.h>
+#include <linux/memblock.h>
+#include <linux/fs.h>
+
+#include <asm/cputype.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/sizes.h>
+#include <asm/tlb.h>
+#include <asm/mmu_context.h>
+
+#include "mm.h"
+
+/*
+ * Empty_zero_page is a special page that is used for zero-initialized data
+ * and COW.
+ */
+struct page *empty_zero_page;
+EXPORT_SYMBOL(empty_zero_page);
+
+pgprot_t pgprot_default;
+EXPORT_SYMBOL(pgprot_default);
+
+static pmdval_t prot_sect_kernel;
+
+struct cachepolicy {
+        const char      policy[16];
+        u64             mair;
+        u64             tcr;
+};
+
+static struct cachepolicy cache_policies[] __initdata = {
+        {
+                .policy         = "uncached",
+                .mair           = 0x44,                 /* inner, outer non-cacheable */
+                .tcr            = TCR_IRGN_NC | TCR_ORGN_NC,
+        }, {
+                .policy         = "writethrough",
+                .mair           = 0xaa,                 /* inner, outer write-through, read-allocate */
+                .tcr            = TCR_IRGN_WT | TCR_ORGN_WT,
+        }, {
+                .policy         = "writeback",
+                .mair           = 0xee,                 /* inner, outer write-back, read-allocate */
+                .tcr            = TCR_IRGN_WBnWA | TCR_ORGN_WBnWA,
+        }
+};
+
+/*
+ * These are useful for identifying cache coherency problems by allowing the
+ * cache or the cache and writebuffer to be turned off. It changes the Normal
+ * memory caching attributes in the MAIR_EL1 register.
+ */
+static int __init early_cachepolicy(char *p)
+{
+        int i;
+        u64 tmp;
+
+        for (i = 0; i < ARRAY_SIZE(cache_policies); i++) {
+                int len = strlen(cache_policies[i].policy);
+
+                if (memcmp(p, cache_policies[i].policy, len) == 0)
+                        break;
+        }
+        if (i == ARRAY_SIZE(cache_policies)) {
+                pr_err("ERROR: unknown or unsupported cache policy: %s\n", p);
+                return 0;
+        }
+
+        flush_cache_all();
+
+        /*
+         * Modify MT_NORMAL attributes in MAIR_EL1.
+         */
+        asm volatile(
+        "       mrs     %0, mair_el1\n"
+        "       bfi     %0, %1, #%2, #8\n"
+        "       msr     mair_el1, %0\n"
+        "       isb\n"
+        : "=&r" (tmp)
+        : "r" (cache_policies[i].mair), "i" (MT_NORMAL * 8));
+
+        /*
+         * Modify TCR PTW cacheability attributes.
+         */
+        asm volatile(
+        "       mrs     %0, tcr_el1\n"
+        "       bic     %0, %0, %2\n"
+        "       orr     %0, %0, %1\n"
+        "       msr     tcr_el1, %0\n"
+        "       isb\n"
+        : "=&r" (tmp)
+        : "r" (cache_policies[i].tcr), "r" (TCR_IRGN_MASK | TCR_ORGN_MASK));
+
+        flush_cache_all();
+
+        return 0;
+}
+early_param("cachepolicy", early_cachepolicy);
+
+/*
+ * Adjust the PMD section entries according to the CPU in use.
+ */
+static void __init init_mem_pgprot(void)
+{
+        pteval_t default_pgprot;
+        int i;
+
+        default_pgprot = PTE_ATTRINDX(MT_NORMAL);
+        prot_sect_kernel = PMD_TYPE_SECT | PMD_SECT_AF | PMD_ATTRINDX(MT_NORMAL);
+
+#ifdef CONFIG_SMP
+        /*
+         * Mark memory with the "shared" attribute for SMP systems
+         */
+        default_pgprot |= PTE_SHARED;
+        prot_sect_kernel |= PMD_SECT_S;
+#endif
+
+        for (i = 0; i < 16; i++) {
+                unsigned long v = pgprot_val(protection_map[i]);
+                protection_map[i] = __pgprot(v | default_pgprot);
+        }
+
+        pgprot_default = __pgprot(PTE_TYPE_PAGE | PTE_AF | default_pgprot);
+}
+
+pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
+                              unsigned long size, pgprot_t vma_prot)
+{
+        if (!pfn_valid(pfn))
+                return pgprot_noncached(vma_prot);
+        else if (file->f_flags & O_SYNC)
+                return pgprot_writecombine(vma_prot);
+        return vma_prot;
+}
+EXPORT_SYMBOL(phys_mem_access_prot);
+
+static void __init *early_alloc(unsigned long sz)
+{
+        void *ptr = __va(memblock_alloc(sz, sz));
+        memset(ptr, 0, sz);
+        return ptr;
+}
+
+static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
+                                  unsigned long end, unsigned long pfn)
+{
+        pte_t *pte;
+
+        if (pmd_none(*pmd)) {
+                pte = early_alloc(PTRS_PER_PTE * sizeof(pte_t));
+                __pmd_populate(pmd, __pa(pte), PMD_TYPE_TABLE);
+        }
+        BUG_ON(pmd_bad(*pmd));
+
+        pte = pte_offset_kernel(pmd, addr);
+        do {
+                set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC));
+                pfn++;
+        } while (pte++, addr += PAGE_SIZE, addr != end);
+}
+
+static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
+                                  unsigned long end, phys_addr_t phys)
+{
+        pmd_t *pmd;
+        unsigned long next;
+
+        /*
+         * Check for initial section mappings in the pgd/pud and remove them.
+         */
+        if (pud_none(*pud) || pud_bad(*pud)) {
+                pmd = early_alloc(PTRS_PER_PMD * sizeof(pmd_t));
+                pud_populate(&init_mm, pud, pmd);
+        }
+
+        pmd = pmd_offset(pud, addr);
+        do {
+                next = pmd_addr_end(addr, end);
+                /* try section mapping first */
+                if (((addr | next | phys) & ~SECTION_MASK) == 0)
+                        set_pmd(pmd, __pmd(phys | prot_sect_kernel));
+                else
+                        alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys));
+                phys += next - addr;
+        } while (pmd++, addr = next, addr != end);
+}
+
+static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
+                                  unsigned long end, unsigned long phys)
+{
+        pud_t *pud = pud_offset(pgd, addr);
+        unsigned long next;
+
+        do {
+                next = pud_addr_end(addr, end);
+                alloc_init_pmd(pud, addr, next, phys);
+                phys += next - addr;
+        } while (pud++, addr = next, addr != end);
+}
+
+/*
+ * Create the page directory entries and any necessary page tables for the
+ * mapping specified by 'md'.
+ */
+static void __init create_mapping(phys_addr_t phys, unsigned long virt,
+                                  phys_addr_t size)
+{
+        unsigned long addr, length, end, next;
+        pgd_t *pgd;
+
+        if (virt < VMALLOC_START) {
+                pr_warning("BUG: not creating mapping for 0x%016llx at 0x%016lx - outside kernel range\n",
+                           phys, virt);
+                return;
+        }
+
+        addr = virt & PAGE_MASK;
+        length = PAGE_ALIGN(size + (virt & ~PAGE_MASK));
+
+        pgd = pgd_offset_k(addr);
+        end = addr + length;
+        do {
+                next = pgd_addr_end(addr, end);
+                alloc_init_pud(pgd, addr, next, phys);
+                phys += next - addr;
+        } while (pgd++, addr = next, addr != end);
+}
+
+static void __init map_mem(void)
+{
+        struct memblock_region *reg;
+
+        /* map all the memory banks */
+        for_each_memblock(memory, reg) {
+                phys_addr_t start = reg->base;
+                phys_addr_t end = start + reg->size;
+
+                if (start >= end)
+                        break;
+
+                create_mapping(start, __phys_to_virt(start), end - start);
+        }
+}
+
+/*
+ * paging_init() sets up the page tables, initialises the zone memory
+ * maps and sets up the zero page.
+ */
+void __init paging_init(void)
+{
+        void *zero_page;
+
+        /*
+         * Maximum PGDIR_SIZE addressable via the initial direct kernel
+         * mapping in swapper_pg_dir.
+         */
+        memblock_set_current_limit((PHYS_OFFSET & PGDIR_MASK) + PGDIR_SIZE);
+
+        init_mem_pgprot();
+        map_mem();
+
+        /*
+         * Finally flush the caches and tlb to ensure that we're in a
+         * consistent state.
+         */
+        flush_cache_all();
+        flush_tlb_all();
+
+        /* allocate the zero page. */
+        zero_page = early_alloc(PAGE_SIZE);
+
+        bootmem_init();
+
+        empty_zero_page = virt_to_page(zero_page);
+        __flush_dcache_page(empty_zero_page);
+
+        /*
+         * TTBR0 is only used for the identity mapping at this stage. Make it
+         * point to zero page to avoid speculatively fetching new entries.
+         */
+        cpu_set_reserved_ttbr0();
+        flush_tlb_all();
+}
+
+/*
+ * Enable the identity mapping to allow the MMU disabling.
+ */
+void setup_mm_for_reboot(void)
+{
+        cpu_switch_mm(idmap_pg_dir, &init_mm);
+        flush_tlb_all();
+}
+
+/*
+ * Check whether a kernel address is valid (derived from arch/x86/).
+ */
+int kern_addr_valid(unsigned long addr)
+{
+        pgd_t *pgd;
+        pud_t *pud;
+        pmd_t *pmd;
+        pte_t *pte;
+
+        if ((((long)addr) >> VA_BITS) != -1UL)
+                return 0;
+
+        pgd = pgd_offset_k(addr);
+        if (pgd_none(*pgd))
+                return 0;
+
+        pud = pud_offset(pgd, addr);
+        if (pud_none(*pud))
+                return 0;
+
+        pmd = pmd_offset(pud, addr);
+        if (pmd_none(*pmd))
+                return 0;
+
+        pte = pte_offset_kernel(pmd, addr);
+        if (pte_none(*pte))
+                return 0;
+
+        return pfn_valid(pte_pfn(*pte));
+}
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+#ifdef CONFIG_ARM64_64K_PAGES
+int __meminit vmemmap_populate(struct page *start_page,
+                               unsigned long size, int node)
+{
+        return vmemmap_populate_basepages(start_page, size, node);
+}
+#else   /* !CONFIG_ARM64_64K_PAGES */
+int __meminit vmemmap_populate(struct page *start_page,
+                               unsigned long size, int node)
+{
+        unsigned long addr = (unsigned long)start_page;
+        unsigned long end = (unsigned long)(start_page + size);
+        unsigned long next;
+        pgd_t *pgd;
+        pud_t *pud;
+        pmd_t *pmd;
+
+        do {
+                next = pmd_addr_end(addr, end);
+
+                pgd = vmemmap_pgd_populate(addr, node);
+                if (!pgd)
+                        return -ENOMEM;
+
+                pud = vmemmap_pud_populate(pgd, addr, node);
+                if (!pud)
+                        return -ENOMEM;
+
+                pmd = pmd_offset(pud, addr);
+                if (pmd_none(*pmd)) {
+                        void *p = NULL;
+
+                        p = vmemmap_alloc_block_buf(PMD_SIZE, node);
+                        if (!p)
+                                return -ENOMEM;
+
+                        set_pmd(pmd, __pmd(__pa(p) | prot_sect_kernel));
+                } else
+                        vmemmap_verify((pte_t *)pmd, node, addr, next);
+        } while (addr = next, addr != end);
+
+        return 0;
+}
+#endif  /* CONFIG_ARM64_64K_PAGES */
+#endif  /* CONFIG_SPARSEMEM_VMEMMAP */
diff --git a/arch/arm64/mm/pgd.c b/arch/arm64/mm/pgd.c
new file mode 100644
index 00000000000..7083cdada65
--- /dev/null
+++ b/arch/arm64/mm/pgd.c
@@ -0,0 +1,54 @@
+/*
+ * PGD allocation/freeing
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/mm.h>
+#include <linux/gfp.h>
+#include <linux/highmem.h>
+#include <linux/slab.h>
+
+#include <asm/pgalloc.h>
+#include <asm/page.h>
+#include <asm/tlbflush.h>
+
+#include "mm.h"
+
+#define PGD_SIZE        (PTRS_PER_PGD * sizeof(pgd_t))
+
+pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+        pgd_t *new_pgd;
+
+        if (PGD_SIZE == PAGE_SIZE)
+                new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
+        else
+                new_pgd = kzalloc(PGD_SIZE, GFP_KERNEL);
+
+        if (!new_pgd)
+                return NULL;
+
+        return new_pgd;
+}
+
+void pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+        if (PGD_SIZE == PAGE_SIZE)
+                free_page((unsigned long)pgd);
+        else
+                kfree(pgd);
+}
diff --git a/arch/arm64/mm/proc-macros.S b/arch/arm64/mm/proc-macros.S
new file mode 100644
index 00000000000..8957b822010
--- /dev/null
+++ b/arch/arm64/mm/proc-macros.S
@@ -0,0 +1,55 @@
+/*
+ * Based on arch/arm/mm/proc-macros.S
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+
+/*
+ * vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
+ */
+        .macro  vma_vm_mm, rd, rn
+        ldr     \rd, [\rn, #VMA_VM_MM]
+        .endm
+
+/*
+ * mmid - get context id from mm pointer (mm->context.id)
+ */
+        .macro  mmid, rd, rn
+        ldr     \rd, [\rn, #MM_CONTEXT_ID]
+        .endm
+
+/*
+ * dcache_line_size - get the minimum D-cache line size from the CTR register.
+ */
+        .macro  dcache_line_size, reg, tmp
+        mrs     \tmp, ctr_el0                   // read CTR
+        lsr     \tmp, \tmp, #16
+        and     \tmp, \tmp, #0xf                // cache line size encoding
+        mov     \reg, #4                        // bytes per word
+        lsl     \reg, \reg, \tmp                // actual cache line size
+        .endm
+
+/*
+ * icache_line_size - get the minimum I-cache line size from the CTR register.
+ */
+        .macro  icache_line_size, reg, tmp
+        mrs     \tmp, ctr_el0                   // read CTR
+        and     \tmp, \tmp, #0xf                // cache line size encoding
+        mov     \reg, #4                        // bytes per word
+        lsl     \reg, \reg, \tmp                // actual cache line size
+        .endm
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
new file mode 100644
index 00000000000..f1d8b9bbfda
--- /dev/null
+++ b/arch/arm64/mm/proc.S
@@ -0,0 +1,175 @@
+/*
+ * Based on arch/arm/mm/proc.S
+ *
+ * Copyright (C) 2001 Deep Blue Solutions Ltd.
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/asm-offsets.h>
+#include <asm/hwcap.h>
+#include <asm/pgtable-hwdef.h>
+#include <asm/pgtable.h>
+
+#include "proc-macros.S"
+
+#ifndef CONFIG_SMP
+/* PTWs cacheable, inner/outer WBWA not shareable */
+#define TCR_FLAGS       TCR_IRGN_WBWA | TCR_ORGN_WBWA
+#else
+/* PTWs cacheable, inner/outer WBWA shareable */
+#define TCR_FLAGS       TCR_IRGN_WBWA | TCR_ORGN_WBWA | TCR_SHARED
+#endif
+
+#define MAIR(attr, mt)  ((attr) << ((mt) * 8))
+
+/*
+ *      cpu_cache_off()
+ *
+ *      Turn the CPU D-cache off.
+ */
+ENTRY(cpu_cache_off)
+        mrs     x0, sctlr_el1
+        bic     x0, x0, #1 << 2                 // clear SCTLR.C
+        msr     sctlr_el1, x0
+        isb
+        ret
+ENDPROC(cpu_cache_off)
+
+/*
+ *      cpu_reset(loc)
+ *
+ *      Perform a soft reset of the system.  Put the CPU into the same state
+ *      as it would be if it had been reset, and branch to what would be the
+ *      reset vector. It must be executed with the flat identity mapping.
+ *
+ *      - loc   - location to jump to for soft reset
+ */
+        .align  5
+ENTRY(cpu_reset)
+        mrs     x1, sctlr_el1
+        bic     x1, x1, #1
+        msr     sctlr_el1, x1                   // disable the MMU
+        isb
+        ret     x0
+ENDPROC(cpu_reset)
+
+/*
+ *      cpu_do_idle()
+ *
+ *      Idle the processor (wait for interrupt).
+ */
+ENTRY(cpu_do_idle)
+        dsb     sy                              // WFI may enter a low-power mode
+        wfi
+        ret
+ENDPROC(cpu_do_idle)
+
+/*
+ *      cpu_switch_mm(pgd_phys, tsk)
+ *
+ *      Set the translation table base pointer to be pgd_phys.
+ *
+ *      - pgd_phys - physical address of new TTB
+ */
+ENTRY(cpu_do_switch_mm)
+        mmid    w1, x1                          // get mm->context.id
+        bfi     x0, x1, #48, #16                // set the ASID
+        msr     ttbr0_el1, x0                   // set TTBR0
+        isb
+        ret
+ENDPROC(cpu_do_switch_mm)
+
+cpu_name:
+        .ascii  "AArch64 Processor"
+        .align
+
+        .section ".text.init", #alloc, #execinstr
+
+/*
+ *      __cpu_setup
+ *
+ *      Initialise the processor for turning the MMU on.  Return in x0 the
+ *      value of the SCTLR_EL1 register.
+ */
+ENTRY(__cpu_setup)
+        /*
+         * Preserve the link register across the function call.
+         */
+        mov     x28, lr
+        bl      __flush_dcache_all
+        mov     lr, x28
+        ic      iallu                           // I+BTB cache invalidate
+        dsb     sy
+
+        mov     x0, #3 << 20
+        msr     cpacr_el1, x0                   // Enable FP/ASIMD
+        mov     x0, #1
+        msr     oslar_el1, x0                   // Set the debug OS lock
+        tlbi    vmalle1is                       // invalidate I + D TLBs
+        /*
+         * Memory region attributes for LPAE:
+         *
+         *   n = AttrIndx[2:0]
+         *                      n       MAIR
+         *   DEVICE_nGnRnE      000     00000000
+         *   DEVICE_nGnRE       001     00000100
+         *   DEVICE_GRE         010     00001100
+         *   NORMAL_NC          011     01000100
+         *   NORMAL             100     11111111
+         */
+        ldr     x5, =MAIR(0x00, MT_DEVICE_nGnRnE) | \
+                     MAIR(0x04, MT_DEVICE_nGnRE) | \
+                     MAIR(0x0c, MT_DEVICE_GRE) | \
+                     MAIR(0x44, MT_NORMAL_NC) | \
+                     MAIR(0xff, MT_NORMAL)
+        msr     mair_el1, x5
+        /*
+         * Prepare SCTLR
+         */
+        adr     x5, crval
+        ldp     w5, w6, [x5]
+        mrs     x0, sctlr_el1
+        bic     x0, x0, x5                      // clear bits
+        orr     x0, x0, x6                      // set bits
+        /*
+         * Set/prepare TCR and TTBR. We use 512GB (39-bit) address range for
+         * both user and kernel.
+         */
+        ldr     x10, =TCR_TxSZ(VA_BITS) | TCR_FLAGS | TCR_IPS_40BIT | \
+                      TCR_ASID16 | (1 << 31)
+#ifdef CONFIG_ARM64_64K_PAGES
+        orr     x10, x10, TCR_TG0_64K
+        orr     x10, x10, TCR_TG1_64K
+#endif
+        msr     tcr_el1, x10
+        ret                                     // return to head.S
+ENDPROC(__cpu_setup)
+
+        /*
+         *                 n n            T
+         *       U E      WT T UD     US IHBS
+         *       CE0      XWHW CZ     ME TEEA S
+         * .... .IEE .... NEAI TE.I ..AD DEN0 ACAM
+         * 0011 0... 1101 ..0. ..0. 10.. .... .... < hardware reserved
+         * .... .100 .... 01.1 11.1 ..01 0001 1101 < software settings
+         */
+        .type   crval, #object
+crval:
+        .word   0x030802e2                      // clear
+        .word   0x0405d11d                      // set
diff --git a/arch/arm64/mm/tlb.S b/arch/arm64/mm/tlb.S
new file mode 100644
index 00000000000..8ae80a18e8e
--- /dev/null
+++ b/arch/arm64/mm/tlb.S
@@ -0,0 +1,71 @@
+/*
+ * Based on arch/arm/mm/tlb.S
+ *
+ * Copyright (C) 1997-2002 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ * Written by Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/asm-offsets.h>
+#include <asm/page.h>
+#include <asm/tlbflush.h>
+#include "proc-macros.S"
+
+/*
+ *      __cpu_flush_user_tlb_range(start, end, vma)
+ *
+ *      Invalidate a range of TLB entries in the specified address space.
+ *
+ *      - start - start address (may not be aligned)
+ *      - end   - end address (exclusive, may not be aligned)
+ *      - vma   - vma_struct describing address range
+ */
+ENTRY(__cpu_flush_user_tlb_range)
+        vma_vm_mm x3, x2                        // get vma->vm_mm
+        mmid    x3, x3                          // get vm_mm->context.id
+        dsb     sy
+        lsr     x0, x0, #12                     // align address
+        lsr     x1, x1, #12
+        bfi     x0, x3, #48, #16                // start VA and ASID
+        bfi     x1, x3, #48, #16                // end VA and ASID
+1:      tlbi    vae1is, x0                      // TLB invalidate by address and ASID
+        add     x0, x0, #1
+        cmp     x0, x1
+        b.lo    1b
+        dsb     sy
+        ret
+ENDPROC(__cpu_flush_user_tlb_range)
+
+/*
+ *      __cpu_flush_kern_tlb_range(start,end)
+ *
+ *      Invalidate a range of kernel TLB entries.
+ *
+ *      - start - start address (may not be aligned)
+ *      - end   - end address (exclusive, may not be aligned)
+ */
+ENTRY(__cpu_flush_kern_tlb_range)
+        dsb     sy
+        lsr     x0, x0, #12                     // align address
+        lsr     x1, x1, #12
+1:      tlbi    vaae1is, x0                     // TLB invalidate by address
+        add     x0, x0, #1
+        cmp     x0, x1
+        b.lo    1b
+        dsb     sy
+        isb
+        ret
+ENDPROC(__cpu_flush_kern_tlb_range)
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index d53cd0afc20..6a78073c380 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -35,3 +35,8 @@ config CLKSRC_DBX500_PRCMU_SCHED_CLOCK
         default y
         help
           Use the always on PRCMU Timer as sched_clock
+
+config CLKSRC_ARM_GENERIC
+        def_bool y if ARM64
+        help
+          This option enables support for the ARM generic timer.
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index b65d0c56ab3..65919901a30 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -13,3 +13,4 @@ obj-$(CONFIG_DW_APB_TIMER)	+= dw_apb_timer.o
 obj-$(CONFIG_DW_APB_TIMER_OF)   += dw_apb_timer_of.o
 obj-$(CONFIG_CLKSRC_DBX500_PRCMU)       += clksrc-dbx500-prcmu.o
 obj-$(CONFIG_ARMADA_370_XP_TIMER)       += time-armada-370-xp.o
+obj-$(CONFIG_CLKSRC_ARM_GENERIC)        += arm_generic.o
diff --git a/drivers/clocksource/arm_generic.c b/drivers/clocksource/arm_generic.c
new file mode 100644
index 00000000000..c4d9f9566c6
--- /dev/null
+++ b/drivers/clocksource/arm_generic.c
@@ -0,0 +1,232 @@
+/*
+ * Generic timers support
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/smp.h>
+#include <linux/cpu.h>
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+#include <linux/clockchips.h>
+#include <linux/of_irq.h>
+#include <linux/io.h>
+
+#include <clocksource/arm_generic.h>
+
+#include <asm/arm_generic.h>
+
+static u32 arch_timer_rate;
+static u64 sched_clock_mult __read_mostly;
+static DEFINE_PER_CPU(struct clock_event_device, arch_timer_evt);
+static int arch_timer_ppi;
+
+static irqreturn_t arch_timer_handle_irq(int irq, void *dev_id)
+{
+        struct clock_event_device *evt = dev_id;
+        unsigned long ctrl;
+
+        ctrl = arch_timer_reg_read(ARCH_TIMER_REG_CTRL);
+        if (ctrl & ARCH_TIMER_CTRL_ISTATUS) {
+                ctrl |= ARCH_TIMER_CTRL_IMASK;
+                arch_timer_reg_write(ARCH_TIMER_REG_CTRL, ctrl);
+                evt->event_handler(evt);
+                return IRQ_HANDLED;
+        }
+
+        return IRQ_NONE;
+}
+
+static void arch_timer_stop(void)
+{
+        unsigned long ctrl;
+
+        ctrl = arch_timer_reg_read(ARCH_TIMER_REG_CTRL);
+        ctrl &= ~ARCH_TIMER_CTRL_ENABLE;
+        arch_timer_reg_write(ARCH_TIMER_REG_CTRL, ctrl);
+}
+
+static void arch_timer_set_mode(enum clock_event_mode mode,
+                                struct clock_event_device *clk)
+{
+        switch (mode) {
+        case CLOCK_EVT_MODE_UNUSED:
+        case CLOCK_EVT_MODE_SHUTDOWN:
+                arch_timer_stop();
+                break;
+        default:
+                break;
+        }
+}
+
+static int arch_timer_set_next_event(unsigned long evt,
+                                     struct clock_event_device *unused)
+{
+        unsigned long ctrl;
+
+        ctrl = arch_timer_reg_read(ARCH_TIMER_REG_CTRL);
+        ctrl |= ARCH_TIMER_CTRL_ENABLE;
+        ctrl &= ~ARCH_TIMER_CTRL_IMASK;
+
+        arch_timer_reg_write(ARCH_TIMER_REG_TVAL, evt);
+        arch_timer_reg_write(ARCH_TIMER_REG_CTRL, ctrl);
+
+        return 0;
+}
+
+static void __cpuinit arch_timer_setup(struct clock_event_device *clk)
+{
+        /* Let's make sure the timer is off before doing anything else */
+        arch_timer_stop();
+
+        clk->features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_C3STOP;
+        clk->name = "arch_sys_timer";
+        clk->rating = 400;
+        clk->set_mode = arch_timer_set_mode;
+        clk->set_next_event = arch_timer_set_next_event;
+        clk->irq = arch_timer_ppi;
+        clk->cpumask = cpumask_of(smp_processor_id());
+
+        clockevents_config_and_register(clk, arch_timer_rate,
+                                        0xf, 0x7fffffff);
+
+        enable_percpu_irq(clk->irq, 0);
+
+        /* Ensure the physical counter is visible to userspace for the vDSO. */
+        arch_counter_enable_user_access();
+}
+
+static void __init arch_timer_calibrate(void)
+{
+        if (arch_timer_rate == 0) {
+                arch_timer_reg_write(ARCH_TIMER_REG_CTRL, 0);
+                arch_timer_rate = arch_timer_reg_read(ARCH_TIMER_REG_FREQ);
+
+                /* Check the timer frequency. */
+                if (arch_timer_rate == 0)
+                        panic("Architected timer frequency is set to zero.\n"
+                              "You must set this in your .dts file\n");
+        }
+
+        /* Cache the sched_clock multiplier to save a divide in the hot path. */
+
+        sched_clock_mult = NSEC_PER_SEC / arch_timer_rate;
+
+        pr_info("Architected local timer running at %u.%02uMHz.\n",
+                 arch_timer_rate / 1000000, (arch_timer_rate / 10000) % 100);
+}
+
+static cycle_t arch_counter_read(struct clocksource *cs)
+{
+        return arch_counter_get_cntpct();
+}
+
+static struct clocksource clocksource_counter = {
+        .name   = "arch_sys_counter",
+        .rating = 400,
+        .read   = arch_counter_read,
+        .mask   = CLOCKSOURCE_MASK(56),
+        .flags  = (CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_VALID_FOR_HRES),
+};
+
+int read_current_timer(unsigned long *timer_value)
+{
+        *timer_value = arch_counter_get_cntpct();
+        return 0;
+}
+
+unsigned long long notrace sched_clock(void)
+{
+        return arch_counter_get_cntvct() * sched_clock_mult;
+}
+
+static int __cpuinit arch_timer_cpu_notify(struct notifier_block *self,
+                                           unsigned long action, void *hcpu)
+{
+        int cpu = (long)hcpu;
+        struct clock_event_device *clk = per_cpu_ptr(&arch_timer_evt, cpu);
+
+        switch(action) {
+        case CPU_STARTING:
+        case CPU_STARTING_FROZEN:
+                arch_timer_setup(clk);
+                break;
+
+        case CPU_DYING:
+        case CPU_DYING_FROZEN:
+                pr_debug("arch_timer_teardown disable IRQ%d cpu #%d\n",
+                         clk->irq, cpu);
+                disable_percpu_irq(clk->irq);
+                arch_timer_set_mode(CLOCK_EVT_MODE_UNUSED, clk);
+                break;
+        }
+
+        return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata arch_timer_cpu_nb = {
+        .notifier_call = arch_timer_cpu_notify,
+};
+
+static const struct of_device_id arch_timer_of_match[] __initconst = {
+        { .compatible = "arm,armv8-timer" },
+        {},
+};
+
+int __init arm_generic_timer_init(void)
+{
+        struct device_node *np;
+        int err;
+        u32 freq;
+
+        np = of_find_matching_node(NULL, arch_timer_of_match);
+        if (!np) {
+                pr_err("arch_timer: can't find DT node\n");
+                return -ENODEV;
+        }
+
+        /* Try to determine the frequency from the device tree or CNTFRQ */
+        if (!of_property_read_u32(np, "clock-frequency", &freq))
+                arch_timer_rate = freq;
+        arch_timer_calibrate();
+
+        arch_timer_ppi = irq_of_parse_and_map(np, 0);
+        pr_info("arch_timer: found %s irq %d\n", np->name, arch_timer_ppi);
+
+        err = request_percpu_irq(arch_timer_ppi, arch_timer_handle_irq,
+                                 np->name, &arch_timer_evt);
+        if (err) {
+                pr_err("arch_timer: can't register interrupt %d (%d)\n",
+                       arch_timer_ppi, err);
+                return err;
+        }
+
+        clocksource_register_hz(&clocksource_counter, arch_timer_rate);
+
+        /* Calibrate the delay loop directly */
+        lpj_fine = arch_timer_rate / HZ;
+
+        /* Immediately configure the timer on the boot CPU */
+        arch_timer_setup(per_cpu_ptr(&arch_timer_evt, smp_processor_id()));
+
+        register_cpu_notifier(&arch_timer_cpu_nb);
+
+        return 0;
+}
diff --git a/fs/stat.c b/fs/stat.c
index 40780229a03..208039eec6c 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -326,7 +326,7 @@ SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
 
 
 /* ---------- LFS-64 ----------- */
-#ifdef __ARCH_WANT_STAT64
+#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
 
 #ifndef INIT_STRUCT_STAT64_PADDING
 #  define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
@@ -415,7 +415,7 @@ SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
                 return error;
         return cp_new_stat64(&stat, statbuf);
 }
-#endif /* __ARCH_WANT_STAT64 */
+#endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
 
 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
 void __inode_add_bytes(struct inode *inode, loff_t bytes)
diff --git a/include/asm-generic/bitops/builtin-__ffs.h b/include/asm-generic/bitops/builtin-__ffs.h
new file mode 100644
index 00000000000..90041e3a41f
--- /dev/null
+++ b/include/asm-generic/bitops/builtin-__ffs.h
@@ -0,0 +1,15 @@
+#ifndef _ASM_GENERIC_BITOPS_BUILTIN___FFS_H_
+#define _ASM_GENERIC_BITOPS_BUILTIN___FFS_H_
+
+/**
+ * __ffs - find first bit in word.
+ * @word: The word to search
+ *
+ * Undefined if no bit exists, so code should check against 0 first.
+ */
+static __always_inline unsigned long __ffs(unsigned long word)
+{
+        return __builtin_ctzl(word);
+}
+
+#endif
diff --git a/include/asm-generic/bitops/builtin-__fls.h b/include/asm-generic/bitops/builtin-__fls.h
new file mode 100644
index 00000000000..0248f386635
--- /dev/null
+++ b/include/asm-generic/bitops/builtin-__fls.h
@@ -0,0 +1,15 @@
+#ifndef _ASM_GENERIC_BITOPS_BUILTIN___FLS_H_
+#define _ASM_GENERIC_BITOPS_BUILTIN___FLS_H_
+
+/**
+ * __fls - find last (most-significant) set bit in a long word
+ * @word: the word to search
+ *
+ * Undefined if no set bit exists, so code should check against 0 first.
+ */
+static __always_inline unsigned long __fls(unsigned long word)
+{
+        return (sizeof(word) * 8) - 1 - __builtin_clzl(word);
+}
+
+#endif
diff --git a/include/asm-generic/bitops/builtin-ffs.h b/include/asm-generic/bitops/builtin-ffs.h
new file mode 100644
index 00000000000..064825829e1
--- /dev/null
+++ b/include/asm-generic/bitops/builtin-ffs.h
@@ -0,0 +1,17 @@
+#ifndef _ASM_GENERIC_BITOPS_BUILTIN_FFS_H_
+#define _ASM_GENERIC_BITOPS_BUILTIN_FFS_H_
+
+/**
+ * ffs - find first bit set
+ * @x: the word to search
+ *
+ * This is defined the same way as
+ * the libc and compiler builtin ffs routines, therefore
+ * differs in spirit from the above ffz (man ffs).
+ */
+static __always_inline int ffs(int x)
+{
+        return __builtin_ffs(x);
+}
+
+#endif
diff --git a/include/asm-generic/bitops/builtin-fls.h b/include/asm-generic/bitops/builtin-fls.h
new file mode 100644
index 00000000000..eda652d0ac7
--- /dev/null
+++ b/include/asm-generic/bitops/builtin-fls.h
@@ -0,0 +1,16 @@
+#ifndef _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_
+#define _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_
+
+/**
+ * fls - find last (most-significant) bit set
+ * @x: the word to search
+ *
+ * This is defined the same way as ffs.
+ * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
+ */
+static __always_inline int fls(int x)
+{
+        return x ? sizeof(x) * 8 - __builtin_clz(x) : 0;
+}
+
+#endif
diff --git a/include/clocksource/arm_generic.h b/include/clocksource/arm_generic.h
new file mode 100644
index 00000000000..5b41b0d27f0
--- /dev/null
+++ b/include/clocksource/arm_generic.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __CLKSOURCE_ARM_GENERIC_H
+#define __CLKSOURCE_ARM_GENERIC_H
+
+extern int arm_generic_timer_init(void);
+
+#endif
diff --git a/include/linux/elf.h b/include/linux/elf.h
index f930b1a390a..0a05051a892 100644
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -389,6 +389,9 @@ typedef struct elf64_shdr {
 #define NT_S390_SYSTEM_CALL     0x307   /* s390 system call restart data */
 #define NT_S390_TDB     0x308           /* s390 transaction diagnostic block */
 #define NT_ARM_VFP      0x400           /* ARM VFP/NEON registers */
+#define NT_ARM_TLS      0x401           /* ARM TLS register */
+#define NT_ARM_HW_BREAK 0x402           /* ARM hardware breakpoint registers */
+#define NT_ARM_HW_WATCH 0x403           /* ARM hardware watchpoint registers */
 
 
 /* Note header in a PT_NOTE section */
diff --git a/init/Kconfig b/init/Kconfig
index 3466a6e017b..495e6e9632d 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1216,7 +1216,8 @@ menuconfig EXPERT
 
 config UID16
         bool "Enable 16-bit UID system calls" if EXPERT
-        depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION)
+        depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION) \
+                || AARCH32_EMULATION
         default y
         help
           This enables the legacy 16-bit UID syscall wrappers.
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 81c7b1a1a30..84c76a34e41 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1544,7 +1544,7 @@ static struct ctl_table fs_table[] = {
 
 static struct ctl_table debug_table[] = {
 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
-    defined(CONFIG_S390) || defined(CONFIG_TILE)
+    defined(CONFIG_S390) || defined(CONFIG_TILE) || defined(CONFIG_ARM64)
         {
                 .procname       = "exception-trace",
                 .data           = &show_unhandled_signals,
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index dacbbe4d7a8..35c4565ee8f 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -452,7 +452,8 @@ config SLUB_STATS
 config DEBUG_KMEMLEAK
         bool "Kernel memory leak detector"
         depends on DEBUG_KERNEL && EXPERIMENTAL && \
-                (X86 || ARM || PPC || MIPS || S390 || SPARC64 || SUPERH || MICROBLAZE || TILE)
+                (X86 || ARM || PPC || MIPS || S390 || SPARC64 || SUPERH || \
+                 MICROBLAZE || TILE || ARM64)
 
         select DEBUG_FS
         select STACKTRACE if STACKTRACE_SUPPORT
@@ -753,7 +754,8 @@ config DEBUG_BUGVERBOSE
         bool "Verbose BUG() reporting (adds 70K)" if DEBUG_KERNEL && EXPERT
         depends on BUG
         depends on ARM || AVR32 || M32R || M68K || SPARC32 || SPARC64 || \
-                   FRV || SUPERH || GENERIC_BUG || BLACKFIN || MN10300 || TILE
+                   FRV || SUPERH || GENERIC_BUG || BLACKFIN || MN10300 || \
+                   TILE || ARM64
         default y
         help
           Say Y here to make BUG() panics output the file name and line number
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 87f4ec6d1f3..a89cbbb6180 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -88,6 +88,12 @@ void get_term_dimensions(struct winsize *ws);
 #define CPUINFO_PROC    "Processor"
 #endif
 
+#ifdef __aarch64__
+#include "../../arch/arm64/include/asm/unistd.h"
+#define rmb()           asm volatile("dmb ld" ::: "memory")
+#define cpu_relax()     asm volatile("yield" ::: "memory")
+#endif
+
 #ifdef __mips__
 #include "../../arch/mips/include/asm/unistd.h"
 #define rmb()           asm volatile(                                   \