arm64: Build infrastructure

This patch adds Makefile and Kconfig files required for building an
AArch64 kernel.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

14 files changed, 654 insertions, 3 deletions

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
new file mode 100644
index 000000000000..767ba5685454
--- /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 000000000000..d7553f2bda66
--- /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 000000000000..364191f3be43
--- /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 000000000000..8dab0bb6ae66
--- /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 000000000000..eca209b2b0bf
--- /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 000000000000..12ed78aa6f0c
--- /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 000000000000..9212c7880da7
--- /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/prom.h b/arch/arm64/include/asm/prom.h
new file mode 100644
index 000000000000..68b90e682957
--- /dev/null
+++ b/arch/arm64/include/asm/prom.h
@@ -0,0 +1 @@
+/* Empty for now */
diff --git a/arch/arm64/kernel/.gitignore b/arch/arm64/kernel/.gitignore
new file mode 100644
index 000000000000..c5f676c3c224
--- /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 000000000000..e2caff1b812a
--- /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/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
new file mode 100644
index 000000000000..3fae2be8b016
--- /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/mm/Makefile b/arch/arm64/mm/Makefile
new file mode 100644
index 000000000000..3140a2abcdc2
--- /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/init/Kconfig b/init/Kconfig
index af6c7f8ba019..8bfda465df2d 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1153,7 +1153,8 @@ 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/lib/Kconfig.debug b/lib/Kconfig.debug
index 2403a63b5da5..cfb4578ac2f7 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
@@ -739,7 +740,8 @@ 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