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Message-ID: <51061AD0.4020200@synopsys.com>
Date: Mon, 28 Jan 2013 11:59:36 +0530
From: Vineet Gupta <Vineet.Gupta1@...opsys.com>
To: Sam Ravnborg <sam@...nborg.org>
CC: <linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<arnd@...db.de>
Subject: Re: [PATCH v3 02/71] ARC: Build system: Makefiles, Kconfig, Linker
script
Hi Sam,
On Thursday 24 January 2013 04:20 PM, Vineet Gupta wrote:
> Arnd in his review pointed out that arch Kconfig organisation has several
> deficiencies:
>
> * Build time entries for things which can be runtime extracted from DT
> (e.g. SDRAM size, core clk frequency..)
> * Not multi-platform-image-build friendly (choice .. endchoice constructs)
> * cpu variants support (750/770) is exclusive.
>
> The first 2 have been fixed in subsequent patches.
> Due to the nature of the 750 and 770, it is not possible to build for
> both together, w/o special runtime glue code which would hurt
> performance.
>
> Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Sam Ravnborg <sam@...nborg.org>
> ---
> arch/arc/Kbuild | 2 +
> arch/arc/Kconfig | 328 ++++++++++++++++++++++++++++++++++++++++
> arch/arc/Kconfig.debug | 34 ++++
> arch/arc/Makefile | 115 ++++++++++++++
> arch/arc/boot/Makefile | 26 +++
> arch/arc/include/asm/Kbuild | 1 +
> arch/arc/kernel/Makefile | 16 ++
> arch/arc/kernel/arcksyms.c | 56 +++++++
> arch/arc/kernel/asm-offsets.c | 46 ++++++
> arch/arc/kernel/vmlinux.lds.S | 116 ++++++++++++++
> arch/arc/lib/Makefile | 9 +
> arch/arc/mm/Makefile | 10 ++
> arch/arc/plat-arcfpga/Kconfig | 33 ++++
> arch/arc/plat-arcfpga/Makefile | 9 +
> 14 files changed, 801 insertions(+), 0 deletions(-)
> create mode 100644 arch/arc/Kbuild
> create mode 100644 arch/arc/Kconfig
> create mode 100644 arch/arc/Kconfig.debug
> create mode 100644 arch/arc/Makefile
> create mode 100644 arch/arc/boot/Makefile
> create mode 100644 arch/arc/kernel/Makefile
> create mode 100644 arch/arc/kernel/arcksyms.c
> create mode 100644 arch/arc/kernel/asm-offsets.c
> create mode 100644 arch/arc/kernel/vmlinux.lds.S
> create mode 100644 arch/arc/lib/Makefile
> create mode 100644 arch/arc/mm/Makefile
> create mode 100644 arch/arc/plat-arcfpga/Kconfig
> create mode 100644 arch/arc/plat-arcfpga/Makefile
>
> diff --git a/arch/arc/Kbuild b/arch/arc/Kbuild
> new file mode 100644
> index 0000000..082d329
> --- /dev/null
> +++ b/arch/arc/Kbuild
> @@ -0,0 +1,2 @@
> +obj-y += kernel/
> +obj-y += mm/
> diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
> new file mode 100644
> index 0000000..b0b09ae
> --- /dev/null
> +++ b/arch/arc/Kconfig
> @@ -0,0 +1,328 @@
> +#
> +# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.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.
> +#
> +
> +config ARC
> + def_bool y
> + select ARCH_NO_VIRT_TO_BUS
> + # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
> + select DEVTMPFS if !INITRAMFS_SOURCE=""
> + select GENERIC_ATOMIC64
> + select GENERIC_CLOCKEVENTS
> + select GENERIC_FIND_FIRST_BIT
> + # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
> + select GENERIC_IRQ_SHOW
> + select GENERIC_PENDING_IRQ if SMP
> + select GENERIC_SMP_IDLE_THREAD
> + select HAVE_GENERIC_HARDIRQS
> + select MODULES_USE_ELF_RELA
> +
> +config SCHED_OMIT_FRAME_POINTER
> + def_bool y
> +
> +config GENERIC_CSUM
> + def_bool y
> +
> +config RWSEM_GENERIC_SPINLOCK
> + def_bool y
> +
> +config ARCH_FLATMEM_ENABLE
> + def_bool y
> +
> +config MMU
> + def_bool y
> +
> +config NO_IOPORT
> + def_bool y
> +
> +config GENERIC_CALIBRATE_DELAY
> + def_bool y
> +
> +config GENERIC_HWEIGHT
> + def_bool y
> +
> +config BINFMT_ELF
> + def_bool y
> +
> +config HAVE_LATENCYTOP_SUPPORT
> + def_bool y
> +
> +config NO_DMA
> + def_bool n
> +
> +source "init/Kconfig"
> +source "kernel/Kconfig.freezer"
> +
> +menu "ARC Architecture Configuration"
> +
> +choice
> + prompt "ARC Platform"
> + default ARC_PLAT_FPGA_LEGACY
> +
> +config ARC_PLAT_FPGA_LEGACY
> + bool "\"Legacy\" ARC FPGA dev platform"
> + help
> + Support for ARC development platforms, provided by Synopsys.
> + These are based on FPGA or ISS. e.g.
> + - ARCAngel4
> + - ML509
> + - MetaWare ISS
> +
> +#New platform adds here
> +endchoice
> +
> +menu "ARC CPU Configuration"
> +
> +choice
> + prompt "ARC Core"
> + default ARC_CPU_770
> +
> +config ARC_CPU_750D
> + bool "ARC750D"
> + help
> + Support for ARC750 core
> +
> +config ARC_CPU_770
> + bool "ARC770"
> + select ARC_CPU_REL_4_10
> + help
> + Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
> + This core has a bunch of cool new features:
> + -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
> + Shared Address Spaces (for sharing TLB entires in MMU)
> + -Caches: New Prog Model, Region Flush
> + -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
> +
> +endchoice
> +
> +config CPU_BIG_ENDIAN
> + bool "Enable Big Endian Mode"
> + default n
> + help
> + Build kernel for Big Endian Mode of ARC CPU
> +
> +menuconfig ARC_CACHE
> + bool "Enable Cache Support"
> + default y
> +
> +if ARC_CACHE
> +
> +config ARC_CACHE_LINE_SHIFT
> + int "Cache Line Length (as power of 2)"
> + range 5 7
> + default "6"
> + help
> + Starting with ARC700 4.9, Cache line length is configurable,
> + This option specifies "N", with Line-len = 2 power N
> + So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
> + Linux only supports same line lengths for I and D caches.
> +
> +config ARC_HAS_ICACHE
> + bool "Use Instruction Cache"
> + default y
> +
> +config ARC_HAS_DCACHE
> + bool "Use Data Cache"
> + default y
> +
> +config ARC_CACHE_PAGES
> + bool "Per Page Cache Control"
> + default y
> + depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
> + help
> + This can be used to over-ride the global I/D Cache Enable on a
> + per-page basis (but only for pages accessed via MMU such as
> + Kernel Virtual address or User Virtual Address)
> + TLB entries have a per-page Cache Enable Bit.
> + Note that Global I/D ENABLE + Per Page DISABLE works but corollary
> + Global DISABLE + Per Page ENABLE won't work
> +
> +endif #ARC_CACHE
> +
> +config ARC_HAS_HW_MPY
> + bool "Use Hardware Multiplier (Normal or Faster XMAC)"
> + default y
> + help
> + Influences how gcc generates code for MPY operations.
> + If enabled, MPYxx insns are generated, provided by Standard/XMAC
> + Multipler. Otherwise software multipy lib is used
> +
> +choice
> + prompt "ARC700 MMU Version"
> + default ARC_MMU_V3 if ARC_CPU_770
> + default ARC_MMU_V2 if ARC_CPU_750D
> +
> +config ARC_MMU_V1
> + bool "MMU v1"
> + help
> + Orig ARC700 MMU
> +
> +config ARC_MMU_V2
> + bool "MMU v2"
> + help
> + Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
> + when 2 D-TLB and 1 I-TLB entries index into same 2way set.
> +
> +config ARC_MMU_V3
> + bool "MMU v3"
> + depends on ARC_CPU_770
> + help
> + Introduced with ARC700 4.10: New Features
> + Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
> + Shared Address Spaces (SASID)
> +
> +endchoice
> +
> +
> +choice
> + prompt "MMU Page Size"
> + default ARC_PAGE_SIZE_8K
> +
> +config ARC_PAGE_SIZE_8K
> + bool "8KB"
> + help
> + Choose between 8k vs 16k
> +
> +config ARC_PAGE_SIZE_16K
> + bool "16KB"
> + depends on ARC_MMU_V3
> +
> +config ARC_PAGE_SIZE_4K
> + bool "4KB"
> + depends on ARC_MMU_V3
> +
> +endchoice
> +
> +config ARC_FPU_SAVE_RESTORE
> + bool "Enable FPU state persistence across context switch"
> + default n
> + help
> + Double Precision Floating Point unit had dedictaed regs which
> + need to be saved/restored across context-switch.
> + Note that ARC FPU is overly simplistic, unlike say x86, which has
> + hardware pieces to allow software to conditionally save/restore,
> + based on actual usage of FPU by a task. Thus our implemn does
> + this for all tasks in system.
> +
> +menuconfig ARC_CPU_REL_4_10
> + bool "Enable support for Rel 4.10 features"
> + default n
> + help
> + -ARC770 (and dependent features) enabled
> + -ARC750 also shares some of the new features with 770
> +
> +config ARC_HAS_LLSC
> + bool "Insn: LLOCK/SCOND (efficient atomic ops)"
> + default y
> + depends on ARC_CPU_770
> + # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
> + depends on !SMP || ARC_HAS_COH_LLSC
> +
> +config ARC_HAS_SWAPE
> + bool "Insn: SWAPE (endian-swap)"
> + default y
> + depends on ARC_CPU_REL_4_10
> +
> +config ARC_HAS_RTSC
> + bool "Insn: RTSC (64-bit r/o cycle counter)"
> + default y
> + depends on ARC_CPU_REL_4_10
> +
> +endmenu # "ARC CPU Configuration"
> +
> +menu "Platform Board Configuration"
> +
> +source "arch/arc/plat-arcfpga/Kconfig"
> +
> +#New platform adds here
> +
> +config ARC_PLAT_CLK
> + int "Clk speed in Hz"
> + default "80000000"
> +
> +config LINUX_LINK_BASE
> + hex "Linux Link Address"
> + default "0x80000000"
> + help
> + ARC700 divides the 32 bit phy address space into two equal halves
> + -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
> + -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
> + Typically Linux kernel is linked at the start of untransalted addr,
> + hence the default value of 0x8zs.
> + However some customers have peripherals mapped at this addr, so
> + Linux needs to be scooted a bit.
> + If you don't know what the above means, leave this setting alone.
> +
> +config ARC_PLAT_SDRAM_SIZE
> + hex "SD RAM Size"
> + default "0x10000000"
> + help
> + Implies the amount of SDRAM/DRAM Linux is going to claim/own.
> + The actual memory itself could be larger than this number. But for
> + all software purposes, this is the amt of memory.
> +
> +endmenu # "Platform Board Configuration"
> +
> +config ARC_STACK_NONEXEC
> + bool "Make stack non-executable"
> + default n
> + help
> + To disable the execute permissions of stack/heap of processes
> + which are enabled by default.
> +
> +config HZ
> + int "Timer Frequency"
> + default 100
> +
> +menuconfig ARC_DBG
> + bool "ARC debugging"
> + default y
> +
> +config ARC_DBG_TLB_PARANOIA
> + bool "Paranoia Checks in Low Level TLB Handlers"
> + depends on ARC_DBG
> + default n
> +
> +config ARC_DBG_TLB_MISS_COUNT
> + bool "Profile TLB Misses"
> + default n
> + select DEBUG_FS
> + depends on ARC_DBG
> + help
> + Counts number of I and D TLB Misses and exports them via Debugfs
> + The counters can be cleared via Debugfs as well
> +
> +config CMDLINE
> + string "Kernel command line to built-in"
> + default "print-fatal-signals=1"
> + help
> + The default command line which will be appended to the optional
> + u-boot provided command line (see below)
> +
> +config CMDLINE_UBOOT
> + bool "Support U-boot kernel command line passing"
> + default n
> + help
> + If you are using U-boot (www.denx.de) and wish to pass the kernel
> + command line from the U-boot environment to the Linux kernel then
> + switch this option on.
> + ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
> + to it. kernel startup code will copy the string into cmdline buffer
> + and also append CONFIG_CMDLINE.
> +
> +source "kernel/Kconfig.preempt"
> +
> +endmenu # "ARC Architecture Configuration"
> +
> +source "mm/Kconfig"
> +source "net/Kconfig"
> +source "drivers/Kconfig"
> +source "fs/Kconfig"
> +source "arch/arc/Kconfig.debug"
> +source "security/Kconfig"
> +source "crypto/Kconfig"
> +source "lib/Kconfig"
> diff --git a/arch/arc/Kconfig.debug b/arch/arc/Kconfig.debug
> new file mode 100644
> index 0000000..962c609
> --- /dev/null
> +++ b/arch/arc/Kconfig.debug
> @@ -0,0 +1,34 @@
> +menu "Kernel hacking"
> +
> +source "lib/Kconfig.debug"
> +
> +config EARLY_PRINTK
> + bool "Early printk" if EMBEDDED
> + default y
> + help
> + Write kernel log output directly into the VGA buffer or to a serial
> + port.
> +
> + This is useful for kernel debugging when your machine crashes very
> + early before the console code is initialized. For normal operation
> + it is not recommended because it looks ugly and doesn't cooperate
> + with klogd/syslogd or the X server. You should normally N here,
> + unless you want to debug such a crash.
> +
> +config DEBUG_STACKOVERFLOW
> + bool "Check for stack overflows"
> + depends on DEBUG_KERNEL
> + help
> + This option will cause messages to be printed if free stack space
> + drops below a certain limit.
> +
> +config 16KSTACKS
> + bool "Use 16Kb for kernel stacks instead of 8Kb"
> + help
> + If you say Y here the kernel will use a 16Kb stacksize for the
> + kernel stack attached to each process/thread. The default is 8K.
> + This increases the resident kernel footprint and will cause less
> + threads to run on the system and also increase the pressure
> + on the VM subsystem for higher order allocations.
> +
> +endmenu
> diff --git a/arch/arc/Makefile b/arch/arc/Makefile
> new file mode 100644
> index 0000000..4d52a3b
> --- /dev/null
> +++ b/arch/arc/Makefile
> @@ -0,0 +1,115 @@
> +#
> +# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.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.
> +#
> +
> +UTS_MACHINE := arc
> +
> +KBUILD_DEFCONFIG := fpga_defconfig
> +
> +# For ARC FPGA Platforms
> +platform-$(CONFIG_ARC_PLAT_FPGA_LEGACY) := arcfpga
> +#New platform adds here
> +
> +PLATFORM := $(platform-y)
> +export PLATFORM
> +
> +cflags-y += -Iarch/arc/plat-$(PLATFORM)/include
> +cflags-y += -mA7 -fno-common -pipe -fno-builtin -D__linux__
> +
> +atleast_gcc44 := $(call cc-ifversion, -gt, 0402, y)
> +cflags-$(atleast_gcc44) += -fsection-anchors
> +
> +cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
> +cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
> +cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc
> +cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables
> +
> +ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
> +# Generic build system uses -O2, we want -O3
> +cflags-y += -O3
> +endif
> +
> +# small data is default for elf32 tool-chain. If not usable, disable it
> +# This also allows repurposing GP as scratch reg to gcc reg allocator
> +disable_small_data := y
> +cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
> +
> +cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
> +ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
> +
> +# STAR 9000518362:
> +# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
> +# --build-id w/o "-marclinux".
> +# Default arc-elf32-ld is OK
> +ldflags-y += -marclinux
> +
> +ARC_LIBGCC := -mA7
> +cflags-$(CONFIG_ARC_HAS_HW_MPY) += -multcost=16
> +
> +ifndef CONFIG_ARC_HAS_HW_MPY
> + cflags-y += -mno-mpy
> +
> +# newlib for ARC700 assumes MPY to be always present, which is generally true
> +# However, if someone really doesn't want MPY, we need to use the 600 ver
> +# which coupled with -mno-mpy will use mpy emulation
> +# With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments,
> +# e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted
> +
> + ARC_LIBGCC := -marc600
> + ifneq ($(atleast_gcc44),y)
> + cflags-y += -multcost=30
> + endif
> +endif
> +
> +LIBGCC := $(shell $(CC) $(ARC_LIBGCC) $(cflags-y) --print-libgcc-file-name)
> +
> +# Modules with short calls might break for calls into builtin-kernel
> +KBUILD_CFLAGS_MODULE += -mlong-calls
> +
> +# Finally dump eveything into kernel build system
> +KBUILD_CFLAGS += $(cflags-y)
> +KBUILD_AFLAGS += $(KBUILD_CFLAGS)
> +LDFLAGS += $(ldflags-y)
> +
> +# Needed for Linker script preprocessing
> +KBUILD_CPPFLAGS += -Iarch/arc/plat-$(PLATFORM)/include
> +
> +head-y := arch/arc/kernel/head.o
> +
> +# See arch/arc/Kbuild for content of core part of the kernel
> +core-y += arch/arc/
> +
> +# w/o this ifneq, make ARCH=arc clean was crapping out
> +ifneq ($(platform-y),)
> +core-y += arch/arc/plat-$(PLATFORM)/
> +endif
> +
> +libs-y += arch/arc/lib/ $(LIBGCC)
> +
> +#default target for make without any arguements.
> +KBUILD_IMAGE := bootpImage
> +
> +all: $(KBUILD_IMAGE)
> +boot := arch/arc/boot
> +
> +bootpImage: vmlinux
> +
> +uImage: vmlinux
> + $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
> +
> +archclean:
> + $(Q)$(MAKE) $(clean)=$(boot)
> +
> +# Hacks to enable final link due to absence of link-time branch relexation
> +# and gcc choosing optimal(shorter) branches at -O3
> +#
> +# vineetg Feb 2010: -mlong-calls switched off for overall kernel build
> +# However lib/decompress_inflate.o (.init.text) calls
> +# zlib_inflate_workspacesize (.text) causing relocation errors.
> +# Thus forcing all exten calls in this file to be long calls
> +export CFLAGS_decompress_inflate.o = -mmedium-calls
> +export CFLAGS_initramfs.o = -mmedium-calls
> diff --git a/arch/arc/boot/Makefile b/arch/arc/boot/Makefile
> new file mode 100644
> index 0000000..7d514c2
> --- /dev/null
> +++ b/arch/arc/boot/Makefile
> @@ -0,0 +1,26 @@
> +targets := vmlinux.bin vmlinux.bin.gz uImage
> +
> +# uImage build relies on mkimage being availble on your host for ARC target
> +# You will need to build u-boot for ARC, rename mkimage to arc-elf32-mkimage
> +# and make sure it's reacable from your PATH
> +MKIMAGE := $(srctree)/scripts/mkuboot.sh
> +
> +OBJCOPYFLAGS= -O binary -R .note -R .note.gnu.build-id -R .comment -S
> +
> +LINUX_START_TEXT = $$(readelf -h vmlinux | \
> + grep "Entry point address" | grep -o 0x.*)
> +
> +UIMAGE_LOADADDR = $(CONFIG_LINUX_LINK_BASE)
> +UIMAGE_ENTRYADDR = $(LINUX_START_TEXT)
> +UIMAGE_COMPRESSION = gzip
> +
> +$(obj)/vmlinux.bin: vmlinux FORCE
> + $(call if_changed,objcopy)
> +
> +$(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin FORCE
> + $(call if_changed,gzip)
> +
> +$(obj)/uImage: $(obj)/vmlinux.bin.gz FORCE
> + $(call if_changed,uimage)
> +
> +PHONY += FORCE
> diff --git a/arch/arc/include/asm/Kbuild b/arch/arc/include/asm/Kbuild
> index a90a3c6..105ec11 100644
> --- a/arch/arc/include/asm/Kbuild
> +++ b/arch/arc/include/asm/Kbuild
> @@ -33,6 +33,7 @@ generic-y += mman.h
> generic-y += msgbuf.h
> generic-y += param.h
> generic-y += parport.h
> +generic-y += pci.h
> generic-y += percpu.h
> generic-y += poll.h
> generic-y += posix_types.h
> diff --git a/arch/arc/kernel/Makefile b/arch/arc/kernel/Makefile
> new file mode 100644
> index 0000000..6d83431
> --- /dev/null
> +++ b/arch/arc/kernel/Makefile
> @@ -0,0 +1,16 @@
> +#
> +# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
> +#
> +# This program is free software; you can redistribute it and/or modify
> +# it under the terms of the GNU General Public License version 2 as
> +# published by the Free Software Foundation.
> +
> +obj-y := arcksyms.o setup.o irq.o time.o reset.o ptrace.o entry.o process.o
> +obj-y += signal.o traps.o sys.o troubleshoot.o stacktrace.o clk.o
> +
> +obj-$(CONFIG_ARC_FPU_SAVE_RESTORE) += fpu.o
> +CFLAGS_fpu.o += -mdpfp
> +
> +obj-y += ctx_sw_asm.o
> +
> +extra-y := vmlinux.lds head.o
> diff --git a/arch/arc/kernel/arcksyms.c b/arch/arc/kernel/arcksyms.c
> new file mode 100644
> index 0000000..4d9e777
> --- /dev/null
> +++ b/arch/arc/kernel/arcksyms.c
> @@ -0,0 +1,56 @@
> +/*
> + * arcksyms.c - Exporting symbols not exportable from their own sources
> + *
> + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.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.
> + *
> + */
> +
> +#include <linux/module.h>
> +
> +/* libgcc functions, not part of kernel sources */
> +extern void __ashldi3(void);
> +extern void __ashrdi3(void);
> +extern void __divsi3(void);
> +extern void __divsf3(void);
> +extern void __lshrdi3(void);
> +extern void __modsi3(void);
> +extern void __muldi3(void);
> +extern void __ucmpdi2(void);
> +extern void __udivsi3(void);
> +extern void __umodsi3(void);
> +extern void __cmpdi2(void);
> +extern void __fixunsdfsi(void);
> +extern void __muldf3(void);
> +extern void __divdf3(void);
> +extern void __floatunsidf(void);
> +extern void __floatunsisf(void);
> +
> +EXPORT_SYMBOL(__ashldi3);
> +EXPORT_SYMBOL(__ashrdi3);
> +EXPORT_SYMBOL(__divsi3);
> +EXPORT_SYMBOL(__divsf3);
> +EXPORT_SYMBOL(__lshrdi3);
> +EXPORT_SYMBOL(__modsi3);
> +EXPORT_SYMBOL(__muldi3);
> +EXPORT_SYMBOL(__ucmpdi2);
> +EXPORT_SYMBOL(__udivsi3);
> +EXPORT_SYMBOL(__umodsi3);
> +EXPORT_SYMBOL(__cmpdi2);
> +EXPORT_SYMBOL(__fixunsdfsi);
> +EXPORT_SYMBOL(__muldf3);
> +EXPORT_SYMBOL(__divdf3);
> +EXPORT_SYMBOL(__floatunsidf);
> +EXPORT_SYMBOL(__floatunsisf);
> +
> +/* ARC optimised assembler routines */
> +EXPORT_SYMBOL(memset);
> +EXPORT_SYMBOL(memcpy);
> +EXPORT_SYMBOL(memcmp);
> +EXPORT_SYMBOL(strchr);
> +EXPORT_SYMBOL(strcpy);
> +EXPORT_SYMBOL(strcmp);
> +EXPORT_SYMBOL(strlen);
> diff --git a/arch/arc/kernel/asm-offsets.c b/arch/arc/kernel/asm-offsets.c
> new file mode 100644
> index 0000000..7f3f611
> --- /dev/null
> +++ b/arch/arc/kernel/asm-offsets.c
> @@ -0,0 +1,46 @@
> +/*
> + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.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.
> + */
> +
> +#include <linux/sched.h>
> +#include <linux/mm.h>
> +#include <linux/interrupt.h>
> +#include <asm/hardirq.h>
> +#include <linux/thread_info.h>
> +#include <asm/page.h>
> +#include <linux/kbuild.h>
> +
> +int main(void)
> +{
> + DEFINE(TASK_THREAD, offsetof(struct task_struct, thread));
> + DEFINE(TASK_THREAD_INFO, offsetof(struct task_struct, stack));
> +
> + BLANK();
> +
> + DEFINE(THREAD_KSP, offsetof(struct thread_struct, ksp));
> + DEFINE(THREAD_CALLEE_REG, offsetof(struct thread_struct, callee_reg));
> + DEFINE(THREAD_FAULT_ADDR,
> + offsetof(struct thread_struct, fault_address));
> +
> + BLANK();
> +
> + DEFINE(THREAD_INFO_FLAGS, offsetof(struct thread_info, flags));
> + DEFINE(THREAD_INFO_PREEMPT_COUNT,
> + offsetof(struct thread_info, preempt_count));
> +
> + BLANK();
> +
> + DEFINE(TASK_ACT_MM, offsetof(struct task_struct, active_mm));
> + DEFINE(TASK_TGID, offsetof(struct task_struct, tgid));
> +
> + DEFINE(MM_CTXT, offsetof(struct mm_struct, context));
> + DEFINE(MM_PGD, offsetof(struct mm_struct, pgd));
> +
> + DEFINE(MM_CTXT_ASID, offsetof(mm_context_t, asid));
> +
> + return 0;
> +}
> diff --git a/arch/arc/kernel/vmlinux.lds.S b/arch/arc/kernel/vmlinux.lds.S
> new file mode 100644
> index 0000000..8c72bc3
> --- /dev/null
> +++ b/arch/arc/kernel/vmlinux.lds.S
> @@ -0,0 +1,116 @@
> +/*
> + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.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.
> + */
> +
> +#include <asm-generic/vmlinux.lds.h>
> +#include <asm/cache.h>
> +#include <asm/page.h>
> +#include <asm/thread_info.h>
> +#include <plat/memmap.h>
> +
> +OUTPUT_ARCH(arc)
> +ENTRY(_stext)
> +
> +#ifdef CONFIG_CPU_BIG_ENDIAN
> +jiffies = jiffies_64 + 4;
> +#else
> +jiffies = jiffies_64;
> +#endif
> +
> +SECTIONS
> +{
> + . = CONFIG_LINUX_LINK_BASE;
> +
> + _int_vec_base_lds = .;
> + .vector : {
> + *(.vector)
> + . = ALIGN(PAGE_SIZE);
> + }
> +
> + /*
> + * The reason for having a seperate subsection .init.ramfs is to
> + * prevent objump from including it in kernel dumps
> + *
> + * Reason for having .init.ramfs above .init is to make sure that the
> + * binary blob is tucked away to one side, reducing the displacement
> + * between .init.text and .text, avoiding any possible relocation
> + * errors because of calls from .init.text to .text
> + * Yes such calls do exist. e.g.
> + * decompress_inflate.c:gunzip( ) -> zlib_inflate_workspace( )
> + */
> +
> + __init_begin = .;
> +
> + .init.ramfs : { INIT_RAM_FS }
> +
> + . = ALIGN(PAGE_SIZE);
> + _stext = .;
> +
> + HEAD_TEXT_SECTION
> + INIT_TEXT_SECTION(L1_CACHE_BYTES)
> +
> + /* INIT_DATA_SECTION open-coded: special INIT_RAM_FS handling */
> + .init.data : {
> + INIT_DATA
> + INIT_SETUP(L1_CACHE_BYTES)
> + INIT_CALLS
> + CON_INITCALL
> + SECURITY_INITCALL
> + }
> +
> + PERCPU_SECTION(L1_CACHE_BYTES)
> +
> + /*
> + * .exit.text is discard at runtime, not link time, to deal with
> + * references from .debug_frame
> + * It will be init freed, being inside [__init_start : __init_end]
> + */
> + .exit.text : { EXIT_TEXT }
> + .exit.data : { EXIT_DATA }
> +
> + . = ALIGN(PAGE_SIZE);
> + __init_end = .;
> +
> + .text : {
> + _text = .;
> + TEXT_TEXT
> + SCHED_TEXT
> + LOCK_TEXT
> + KPROBES_TEXT
> + *(.fixup)
> + *(.gnu.warning)
> + }
> + EXCEPTION_TABLE(L1_CACHE_BYTES)
> + _etext = .;
> +
> + _sdata = .;
> + RO_DATA_SECTION(PAGE_SIZE)
> +
> + /*
> + * 1. this is .data essentially
> + * 2. THREAD_SIZE for init.task, must be kernel-stk sz aligned
> + */
> + RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
> +
> + _edata = .;
> +
> + BSS_SECTION(0, 0, 0)
> +
> + NOTES
> +
> + . = ALIGN(PAGE_SIZE);
> + _end = . ;
> +
> + STABS_DEBUG
> + DWARF_DEBUG
> + DISCARDS
> +
> + .arcextmap 0 : {
> + *(.gnu.linkonce.arcextmap.*)
> + *(.arcextmap.*)
> + }
> +}
> diff --git a/arch/arc/lib/Makefile b/arch/arc/lib/Makefile
> new file mode 100644
> index 0000000..db46e20
> --- /dev/null
> +++ b/arch/arc/lib/Makefile
> @@ -0,0 +1,9 @@
> +#
> +# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.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.
> +
> +lib-y := strchr-700.o strcmp.o strcpy-700.o strlen.o
> +lib-y += memcmp.o memcpy-700.o memset.o
> diff --git a/arch/arc/mm/Makefile b/arch/arc/mm/Makefile
> new file mode 100644
> index 0000000..168dc14
> --- /dev/null
> +++ b/arch/arc/mm/Makefile
> @@ -0,0 +1,10 @@
> +#
> +# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.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.
> +#
> +
> +obj-y := extable.o ioremap.o dma.o fault.o init.o
> +obj-y += tlb.o tlbex.o cache_arc700.o
> diff --git a/arch/arc/plat-arcfpga/Kconfig b/arch/arc/plat-arcfpga/Kconfig
> new file mode 100644
> index 0000000..7af3a4e
> --- /dev/null
> +++ b/arch/arc/plat-arcfpga/Kconfig
> @@ -0,0 +1,33 @@
> +#
> +# Copyright (C) 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.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.
> +#
> +
> +if ARC_PLAT_FPGA_LEGACY
> +
> +choice
> + prompt "FPGA Board"
> +
> +config ARC_BOARD_ANGEL4
> + bool "ARC Angel4"
> + help
> + ARC Angel4 FPGA Ref Platform (Xilinx Virtex Based)
> +
> +config ARC_BOARD_ML509
> + bool "ML509"
> + help
> + ARC ML509 FPGA Ref Platform (Xilinx Virtex-5 Based)
> +
> +endchoice
> +
> +config ARC_SERIAL_BAUD
> + int "UART Baud rate"
> + default "115200"
> + depends on SERIAL_ARC || SERIAL_ARC_CONSOLE
> + help
> + Baud rate for the ARC UART
> +
> +endif
> diff --git a/arch/arc/plat-arcfpga/Makefile b/arch/arc/plat-arcfpga/Makefile
> new file mode 100644
> index 0000000..385eb9d
> --- /dev/null
> +++ b/arch/arc/plat-arcfpga/Makefile
> @@ -0,0 +1,9 @@
> +#
> +# Copyright (C) 2011-2012 Synopsys, Inc. (www.synopsys.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.
> +#
> +
> +obj-y := platform.o irq.o
>
If this patch looks OK - can you please respond with an ACK. If not, please let me
know what, if any, needs fixing/reworking.
Thx,
-Vineet
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