ARC: Build system: Makefiles, Kconfig, Linker script

obj-y += kernel/

obj-y += mm/

#

# 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"

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

#

# 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

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