forked from Minki/linux
41195d236e
ARC common code to enable a SMP system + ISS provided SMP extensions. ARC700 natively lacks SMP support, hence some of the core features are are only enabled if SoCs have the necessary h/w pixie-dust. This includes: -Inter Processor Interrupts (IPI) -Cache coherency -load-locked/store-conditional ... The low level exception handling would be completely broken in SMP because we don't have hardware assisted stack switching. Thus a fair bit of this code is repurposing the MMU_SCRATCH reg for event handler prologues to keep them re-entrant. Many thanks to Rajeshwar Ranga for his initial "major" contributions to SMP Port (back in 2008), and to Noam Camus and Gilad Ben-Yossef for help with resurrecting that in 3.2 kernel (2012). Note that this platform code is again singleton design pattern - so multiple SMP platforms won't build at the moment - this deficiency is addressed in subsequent patches within this series. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rajeshwar Ranga <rajeshwar.ranga@gmail.com> Cc: Noam Camus <noamc@ezchip.com> Cc: Gilad Ben-Yossef <gilad@benyossef.com>
139 lines
4.1 KiB
Makefile
139 lines
4.1 KiB
Makefile
#
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# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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UTS_MACHINE := arc
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KBUILD_DEFCONFIG := fpga_defconfig
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# For ARC FPGA Platforms
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platform-$(CONFIG_ARC_PLAT_FPGA_LEGACY) := arcfpga
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#New platform adds here
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PLATFORM := $(platform-y)
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export PLATFORM
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cflags-y += -Iarch/arc/plat-$(PLATFORM)/include
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cflags-y += -mA7 -fno-common -pipe -fno-builtin -D__linux__
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ifdef CONFIG_ARC_CURR_IN_REG
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# For a global register defintion, make sure it gets passed to every file
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# We had a customer reported bug where some code built in kernel was NOT using
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# any kernel headers, and missing the r25 global register
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# Can't do unconditionally (like above) because of recursive include issues
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# due to <linux/thread_info.h>
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LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h
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endif
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atleast_gcc44 := $(call cc-ifversion, -gt, 0402, y)
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cflags-$(atleast_gcc44) += -fsection-anchors
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cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
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cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
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cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc
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cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables
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ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
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# Generic build system uses -O2, we want -O3
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cflags-y += -O3
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endif
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# small data is default for elf32 tool-chain. If not usable, disable it
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# This also allows repurposing GP as scratch reg to gcc reg allocator
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disable_small_data := y
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cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
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cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
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ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
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# STAR 9000518362:
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# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
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# --build-id w/o "-marclinux".
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# Default arc-elf32-ld is OK
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ldflags-y += -marclinux
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ARC_LIBGCC := -mA7
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cflags-$(CONFIG_ARC_HAS_HW_MPY) += -multcost=16
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ifndef CONFIG_ARC_HAS_HW_MPY
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cflags-y += -mno-mpy
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# newlib for ARC700 assumes MPY to be always present, which is generally true
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# However, if someone really doesn't want MPY, we need to use the 600 ver
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# which coupled with -mno-mpy will use mpy emulation
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# With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments,
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# e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted
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ARC_LIBGCC := -marc600
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ifneq ($(atleast_gcc44),y)
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cflags-y += -multcost=30
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endif
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endif
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LIBGCC := $(shell $(CC) $(ARC_LIBGCC) $(cflags-y) --print-libgcc-file-name)
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# Modules with short calls might break for calls into builtin-kernel
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KBUILD_CFLAGS_MODULE += -mlong-calls
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# Finally dump eveything into kernel build system
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KBUILD_CFLAGS += $(cflags-y)
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KBUILD_AFLAGS += $(KBUILD_CFLAGS)
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LDFLAGS += $(ldflags-y)
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# Needed for Linker script preprocessing
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KBUILD_CPPFLAGS += -Iarch/arc/plat-$(PLATFORM)/include
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head-y := arch/arc/kernel/head.o
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# See arch/arc/Kbuild for content of core part of the kernel
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core-y += arch/arc/
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# w/o this dtb won't embed into kernel binary
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core-y += arch/arc/boot/dts/
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# w/o this ifneq, make ARCH=arc clean was crapping out
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ifneq ($(platform-y),)
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core-y += arch/arc/plat-$(PLATFORM)/
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endif
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drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/
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libs-y += arch/arc/lib/ $(LIBGCC)
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#default target for make without any arguements.
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KBUILD_IMAGE := bootpImage
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all: $(KBUILD_IMAGE)
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boot := arch/arc/boot
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bootpImage: vmlinux
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uImage: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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%.dtb %.dtb.S %.dtb.o: scripts
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$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
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dtbs: scripts
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$(Q)$(MAKE) $(build)=$(boot)/dts dtbs
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archclean:
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$(Q)$(MAKE) $(clean)=$(boot)
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# Hacks to enable final link due to absence of link-time branch relexation
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# and gcc choosing optimal(shorter) branches at -O3
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#
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# vineetg Feb 2010: -mlong-calls switched off for overall kernel build
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# However lib/decompress_inflate.o (.init.text) calls
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# zlib_inflate_workspacesize (.text) causing relocation errors.
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# Thus forcing all exten calls in this file to be long calls
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export CFLAGS_decompress_inflate.o = -mmedium-calls
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export CFLAGS_initramfs.o = -mmedium-calls
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ifdef CONFIG_SMP
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export CFLAGS_core.o = -mmedium-calls
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endif
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