Hexagon: Add configuration and makefiles for the Hexagon architecture.

Signed-off-by: Linas Vepstas <linas@codeaurora.org>
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

7 files changed, 498 insertions, 0 deletions

diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
new file mode 100644
index 000000000000..02513c2dd5ec
--- /dev/null
+++ b/arch/hexagon/Kconfig
@@ -0,0 +1,220 @@
+# Hexagon configuration
+comment "Linux Kernel Configuration for Hexagon"
+
+config HEXAGON
+        def_bool y
+        select HAVE_OPROFILE
+        select USE_GENERIC_SMP_HELPERS if SMP
+        # Other pending projects/to-do items.
+        # select HAVE_REGS_AND_STACK_ACCESS_API
+        # select HAVE_HW_BREAKPOINT if PERF_EVENTS
+        # select ARCH_HAS_CPU_IDLE_WAIT
+        # select ARCH_WANT_OPTIONAL_GPIOLIB
+        # select ARCH_REQUIRE_GPIOLIB
+        # select HAVE_CLK
+        # select IRQ_PER_CPU
+        select HAVE_IRQ_WORK
+        # select GENERIC_PENDING_IRQ if SMP
+        select GENERIC_ATOMIC64
+        select HAVE_PERF_EVENTS
+        select HAVE_GENERIC_HARDIRQS
+        select GENERIC_HARDIRQS_NO__DO_IRQ
+        select GENERIC_HARDIRQS_NO_DEPRECATED
+        # GENERIC_ALLOCATOR is used by dma_alloc_coherent()
+        select GENERIC_ALLOCATOR
+        select GENERIC_IRQ_SHOW
+        select HAVE_ARCH_KGDB
+        select HAVE_ARCH_TRACEHOOK
+        select NO_IOPORT
+        # mostly generic routines, with some accelerated ones
+        ---help---
+          Qualcomm Hexagon is a processor architecture designed for high
+          performance and low power across a wide variety of applications.
+
+config HEXAGON_ARCH_V1
+        bool
+
+config HEXAGON_ARCH_V2
+        bool
+
+config HEXAGON_ARCH_V3
+        bool
+
+config HEXAGON_ARCH_V4
+        bool
+
+config FRAME_POINTER
+        def_bool y
+
+config LOCKDEP_SUPPORT
+        def_bool y
+
+config PCI
+        def_bool n
+
+config EARLY_PRINTK
+        def_bool y
+
+config KTIME_SCALAR
+        def_bool y
+
+config MMU
+        def_bool y
+
+config TRACE_IRQFLAGS_SUPPORT
+        def_bool y
+
+config GENERIC_CSUM
+        def_bool y
+
+#
+# Use the generic interrupt handling code in kernel/irq/:
+#
+config GENERIC_IRQ_PROBE
+        def_bool y
+
+config GENERIC_IOMAP
+        def_bool y
+
+#config ZONE_DMA
+#       bool
+#       default y
+
+config HAS_DMA
+        bool
+        select HAVE_DMA_ATTRS
+        default y
+
+config NEED_SG_DMA_LENGTH
+        def_bool y
+
+config RWSEM_GENERIC_SPINLOCK
+        def_bool n
+
+config RWSEM_XCHGADD_ALGORITHM
+        def_bool y
+
+config GENERIC_FIND_NEXT_BIT
+        def_bool y
+
+config GENERIC_HWEIGHT
+        def_bool y
+
+config GENERIC_TIME
+        def_bool y
+
+config GENERIC_CLOCKEVENTS
+        def_bool y
+
+config GENERIC_CLOCKEVENTS_BROADCAST
+        def_bool y
+
+config STACKTRACE_SUPPORT
+        def_bool y
+        select STACKTRACE
+
+config GENERIC_BUG
+        def_bool y
+        depends on BUG
+
+config BUG
+        def_bool y
+
+menu "Machine selection"
+
+choice
+        prompt "System type"
+        default HEXAGON_ARCH_V2
+
+config HEXAGON_COMET
+        bool "Comet Board"
+        select HEXAGON_ARCH_V2
+        ---help---
+          Support for the Comet platform.
+
+endchoice
+
+config HEXAGON_VM
+        def_bool y
+
+config CMDLINE
+        string "Default kernel command string"
+        default ""
+        help
+          On some platforms, there is currently no way for the boot loader
+          to pass arguments to the kernel. For these, you should supply some
+          command-line options at build time by entering them here.  At a
+          minimum, you should specify the memory size and the root device
+          (e.g., mem=64M root=/dev/nfs).
+
+config HEXAGON_ANGEL_TRAPS
+        bool "Use Angel Traps"
+        default n
+        ---help---
+          Enable angel debug traps (for printk's).
+
+config SMP
+        bool "Multi-Processing support"
+        ---help---
+          Enables SMP support in the kernel.  If unsure, say "Y"
+
+config NR_CPUS
+        int "Maximum number of CPUs" if SMP
+        range 2 6 if SMP
+        default "1" if !SMP
+        default "6" if SMP
+        ---help---
+          This allows you to specify the maximum number of CPUs which this
+          kernel will support.  The maximum supported value is 6 and the
+          minimum value which makes sense is 2.
+
+          This is purely to save memory - each supported CPU adds
+          approximately eight kilobytes to the kernel image.
+
+choice
+        prompt "Kernel page size"
+        default PAGE_SIZE_4KB
+        ---help---
+          Changes the default page size; use with caution.
+
+config PAGE_SIZE_4KB
+        bool "4KB"
+
+config PAGE_SIZE_16KB
+        bool "16KB"
+
+config PAGE_SIZE_64KB
+        bool "64KB"
+
+config PAGE_SIZE_256KB
+        bool "256KB"
+
+endchoice
+
+source "mm/Kconfig"
+
+source "kernel/Kconfig.hz"
+source "kernel/time/Kconfig"
+
+config GENERIC_GPIO
+        bool "Generic GPIO support"
+        default n
+
+endmenu
+
+source "init/Kconfig"
+source "drivers/Kconfig"
+source "fs/Kconfig"
+
+menu "Executable File Formats"
+source "fs/Kconfig.binfmt"
+endmenu
+
+source "net/Kconfig"
+source "security/Kconfig"
+source "crypto/Kconfig"
+source "lib/Kconfig"
+
+menu "Kernel hacking"
+source "lib/Kconfig.debug"
+endmenu
diff --git a/arch/hexagon/Makefile b/arch/hexagon/Makefile
new file mode 100644
index 000000000000..0c4de8790fd5
--- /dev/null
+++ b/arch/hexagon/Makefile
@@ -0,0 +1,58 @@
+#  Makefile for the Hexagon arch
+
+KBUILD_DEFCONFIG = comet_defconfig
+
+# Do not use GP-relative jumps
+KBUILD_CFLAGS += -G0
+LDFLAGS_vmlinux += -G0
+
+# Do not use single-byte enums; these will overflow.
+KBUILD_CFLAGS += -fno-short-enums
+
+# Modules must use either long-calls, or use pic/plt.
+# Use long-calls for now, it's easier.  And faster.
+# CFLAGS_MODULE += -fPIC
+# LDFLAGS_MODULE += -shared
+CFLAGS_MODULE += -mlong-calls
+
+cflags-$(CONFIG_HEXAGON_ARCH_V1) += $(call cc-option,-mv1)
+cflags-$(CONFIG_HEXAGON_ARCH_V2) += $(call cc-option,-mv2)
+cflags-$(CONFIG_HEXAGON_ARCH_V3) += $(call cc-option,-mv3)
+cflags-$(CONFIG_HEXAGON_ARCH_V4) += $(call cc-option,-mv4)
+
+aflags-$(CONFIG_HEXAGON_ARCH_V1) += $(call cc-option,-mv1)
+aflags-$(CONFIG_HEXAGON_ARCH_V2) += $(call cc-option,-mv2)
+aflags-$(CONFIG_HEXAGON_ARCH_V3) += $(call cc-option,-mv3)
+aflags-$(CONFIG_HEXAGON_ARCH_V4) += $(call cc-option,-mv4)
+
+ldflags-$(CONFIG_HEXAGON_ARCH_V1) += $(call cc-option,-mv1)
+ldflags-$(CONFIG_HEXAGON_ARCH_V2) += $(call cc-option,-mv2)
+ldflags-$(CONFIG_HEXAGON_ARCH_V3) += $(call cc-option,-mv3)
+ldflags-$(CONFIG_HEXAGON_ARCH_V4) += $(call cc-option,-mv4)
+
+KBUILD_CFLAGS += $(cflags-y)
+KBUILD_AFLAGS += $(aflags-y)
+
+#  no KBUILD_LDFLAGS?
+LDFLAGS += $(ldflags-y)
+
+# Thread-info register will be r19.  This value is not configureable;
+# it is hard-coded in several files.
+TIR_NAME := r19
+KBUILD_CFLAGS += -ffixed-$(TIR_NAME) -DTHREADINFO_REG=$(TIR_NAME) -D__linux__
+KBUILD_AFLAGS += -DTHREADINFO_REG=$(TIR_NAME)
+
+LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
+libs-y += $(LIBGCC)
+
+head-y := arch/hexagon/kernel/head.o \
+        arch/hexagon/kernel/init_task.o
+
+core-y += arch/hexagon/kernel/ \
+        arch/hexagon/mm/ \
+        arch/hexagon/lib/
+
+#       arch/hexagon/platform/common/
+#
+#core-$(CONFIG_HEXAGON_COMET)           += arch/hexagon/platform/comet/
+#machine-$(CONFIG_HEXAGON_COMET)                := comet
diff --git a/arch/hexagon/kernel/Makefile b/arch/hexagon/kernel/Makefile
new file mode 100644
index 000000000000..3689f3754d09
--- /dev/null
+++ b/arch/hexagon/kernel/Makefile
@@ -0,0 +1,18 @@
+extra-y := head.o vmlinux.lds init_task.o
+
+obj-$(CONFIG_SMP) += smp.o topology.o
+
+obj-y += setup.o irq_cpu.o traps.o syscalltab.o signal.o time.o
+obj-y += process.o syscall.o trampoline.o reset.o ptrace.o
+obj-y += vdso.o
+
+obj-$(CONFIG_KGDB)    += kgdb.o
+obj-$(CONFIG_MODULES) += module.o hexagon_ksyms.o
+
+# Modules required to work with the Hexagon Virtual Machine
+obj-y += vm_entry.o vm_events.o vm_switch.o vm_ops.o vm_init_segtable.o
+obj-y += vm_vectors.o
+
+obj-$(CONFIG_HAS_DMA) += dma.o
+
+obj-$(CONFIG_STACKTRACE) += stacktrace.o
diff --git a/arch/hexagon/kernel/asm-offsets.c b/arch/hexagon/kernel/asm-offsets.c
new file mode 100644
index 000000000000..89ffa514611f
--- /dev/null
+++ b/arch/hexagon/kernel/asm-offsets.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 1996 David S. Miller
+ * Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003 Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ * Kevin Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 2000 MIPS Technologies, Inc.
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <linux/compat.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/kbuild.h>
+#include <asm/ptrace.h>
+#include <asm/processor.h>
+
+/*  This file is used to produce asm/linkerscript constants from header
+    files typically used in c.  Specifically, it generates asm-offsets.h  */
+
+int main(void)
+{
+        COMMENT("This is a comment.");
+        /*  might get these from somewhere else.  */
+        DEFINE(_PAGE_SIZE, PAGE_SIZE);
+        DEFINE(_PAGE_SHIFT, PAGE_SHIFT);
+        BLANK();
+
+        COMMENT("Hexagon pt_regs definitions");
+        OFFSET(_PT_SYSCALL_NR, pt_regs, syscall_nr);
+        OFFSET(_PT_UGPGP, pt_regs, ugpgp);
+        OFFSET(_PT_R3130, pt_regs, r3130);
+        OFFSET(_PT_R2928, pt_regs, r2928);
+        OFFSET(_PT_R2726, pt_regs, r2726);
+        OFFSET(_PT_R2524, pt_regs, r2524);
+        OFFSET(_PT_R2322, pt_regs, r2322);
+        OFFSET(_PT_R2120, pt_regs, r2120);
+        OFFSET(_PT_R1918, pt_regs, r1918);
+        OFFSET(_PT_R1716, pt_regs, r1716);
+        OFFSET(_PT_R1514, pt_regs, r1514);
+        OFFSET(_PT_R1312, pt_regs, r1312);
+        OFFSET(_PT_R1110, pt_regs, r1110);
+        OFFSET(_PT_R0908, pt_regs, r0908);
+        OFFSET(_PT_R0706, pt_regs, r0706);
+        OFFSET(_PT_R0504, pt_regs, r0504);
+        OFFSET(_PT_R0302, pt_regs, r0302);
+        OFFSET(_PT_R0100, pt_regs, r0100);
+        OFFSET(_PT_LC0SA0, pt_regs, lc0sa0);
+        OFFSET(_PT_LC1SA1, pt_regs, lc1sa1);
+        OFFSET(_PT_M1M0, pt_regs, m1m0);
+        OFFSET(_PT_PREDSUSR, pt_regs, predsusr);
+        OFFSET(_PT_EVREC, pt_regs, hvmer);
+        OFFSET(_PT_ER_VMEL, pt_regs, hvmer.vmel);
+        OFFSET(_PT_ER_VMEST, pt_regs, hvmer.vmest);
+        OFFSET(_PT_ER_VMPSP, pt_regs, hvmer.vmpsp);
+        OFFSET(_PT_ER_VMBADVA, pt_regs, hvmer.vmbadva);
+        DEFINE(_PT_REGS_SIZE, sizeof(struct pt_regs));
+        BLANK();
+
+        COMMENT("Hexagon thread_info definitions");
+        OFFSET(_THREAD_INFO_FLAGS, thread_info, flags);
+        OFFSET(_THREAD_INFO_PT_REGS, thread_info, regs);
+        OFFSET(_THREAD_INFO_SP, thread_info, sp);
+        DEFINE(_THREAD_SIZE, THREAD_SIZE);
+        BLANK();
+
+        COMMENT("Hexagon hexagon_switch_stack definitions");
+        OFFSET(_SWITCH_R1716, hexagon_switch_stack, r1716);
+        OFFSET(_SWITCH_R1918, hexagon_switch_stack, r1918);
+        OFFSET(_SWITCH_R2120, hexagon_switch_stack, r2120);
+        OFFSET(_SWITCH_R2322, hexagon_switch_stack, r2322);
+
+        OFFSET(_SWITCH_R2524, hexagon_switch_stack, r2524);
+        OFFSET(_SWITCH_R2726, hexagon_switch_stack, r2726);
+        OFFSET(_SWITCH_FP, hexagon_switch_stack, fp);
+        OFFSET(_SWITCH_LR, hexagon_switch_stack, lr);
+        DEFINE(_SWITCH_STACK_SIZE, sizeof(struct hexagon_switch_stack));
+        BLANK();
+
+        COMMENT("Hexagon task_struct definitions");
+        OFFSET(_TASK_THREAD_INFO, task_struct, stack);
+        OFFSET(_TASK_STRUCT_THREAD, task_struct, thread);
+
+        COMMENT("Hexagon thread_struct definitions");
+        OFFSET(_THREAD_STRUCT_SWITCH_SP, thread_struct, switch_sp);
+
+        return 0;
+}
diff --git a/arch/hexagon/kernel/vmlinux.lds.S b/arch/hexagon/kernel/vmlinux.lds.S
new file mode 100644
index 000000000000..071d3c30edfb
--- /dev/null
+++ b/arch/hexagon/kernel/vmlinux.lds.S
@@ -0,0 +1,88 @@
+/*
+ * Linker script for Hexagon kernel
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#define LOAD_OFFSET PAGE_OFFSET
+
+#include <asm-generic/vmlinux.lds.h>
+#include <asm/asm-offsets.h>    /*  Most of the kernel defines are here  */
+#include <asm/mem-layout.h>     /*  except for page_offset  */
+#include <asm/cache.h>          /*  and now we're pulling cache line size  */
+OUTPUT_ARCH(hexagon)
+ENTRY(stext)
+
+jiffies = jiffies_64;
+
+/*
+See asm-generic/vmlinux.lds.h for expansion of some of these macros.
+See asm-generic/sections.h for seemingly required labels.
+*/
+
+#define PAGE_SIZE _PAGE_SIZE
+
+/*  This LOAD_OFFSET is temporary for debugging on the simulator; it may change
+    for hypervisor pseudo-physical memory.  */
+
+
+SECTIONS
+{
+        . = PAGE_OFFSET + LOAD_ADDRESS;
+
+        __init_begin = .;
+        HEAD_TEXT_SECTION
+        INIT_TEXT_SECTION(PAGE_SIZE)
+        PERCPU_SECTION(L1_CACHE_BYTES)
+        __init_end = .;
+
+        . = ALIGN(_PAGE_SIZE);
+        _stext = .;
+        .text : AT(ADDR(.text) - LOAD_OFFSET) {
+                _text = .;
+                TEXT_TEXT
+                SCHED_TEXT
+                LOCK_TEXT
+                KPROBES_TEXT
+                *(.fixup)
+        }
+        _etext = .;
+
+        INIT_DATA_SECTION(PAGE_SIZE)
+
+        _sdata = .;
+                RW_DATA_SECTION(32,PAGE_SIZE,PAGE_SIZE)
+                RO_DATA_SECTION(PAGE_SIZE)
+        _edata = .;
+
+        EXCEPTION_TABLE(16)
+        NOTES
+
+        BSS_SECTION(_PAGE_SIZE, _PAGE_SIZE, _PAGE_SIZE)
+
+        _end = .;
+
+        /DISCARD/ : {
+                EXIT_TEXT
+                EXIT_DATA
+                EXIT_CALL
+        }
+
+        STABS_DEBUG
+        DWARF_DEBUG
+
+}
diff --git a/arch/hexagon/lib/Makefile b/arch/hexagon/lib/Makefile
new file mode 100644
index 000000000000..874655e85671
--- /dev/null
+++ b/arch/hexagon/lib/Makefile
@@ -0,0 +1,4 @@
+#
+# Makefile for hexagon-specific library files.
+#
+obj-y = checksum.o io.o memcpy.o memset.o
diff --git a/arch/hexagon/mm/Makefile b/arch/hexagon/mm/Makefile
new file mode 100644
index 000000000000..1a0be4d576e1
--- /dev/null
+++ b/arch/hexagon/mm/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for Hexagon memory management subsystem
+#
+
+obj-y := init.o pgalloc.o ioremap.o uaccess.o vm_fault.o cache.o
+obj-y += copy_to_user.o copy_from_user.o strnlen_user.o vm_tlb.o