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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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9e3699ea7b
Depending on how GCC is built, GCC 4 may generate altivec instructions without
user explicitly requesting vector operations in the code. Although this is a
performance booster for user applications, it is a problem for kernel.
This patch explicitly instruct GCC to NOT generate altivec instructions while
building the kernel.
Here are some test cases I ran.
(1) build gcc 4.0.1 with '--with-cpu=7450 --enable-altivec
--enable-cxx-flags=-mcpu=7450', and use this gcc to build kernel WITHOUT
this kernel patch. Kernel fail to boot up on a 7450 board because of
altivec instructions in kernel.
(2) build gcc 4.0.1 with "--with-cpu=7450 --enable-altivec
--enable-cxx-flags=-mcpu=7450", and use this gcc to build kernel WITH this
kernel patch. Kernel boot up on a 7450 board without any problem.
(3) build gcc 4.0.1 with "--with-cpu=750 --enable-cxx-flags=-mcpu=750",
and use this gcc to build kernel with or without this kernel patch.
Kernel boot up on a 7450 board without any problem.
This patch should also work with GCC 3 or even earlier GCC 2.95.3.
Signed-off-by: Lee Nicks <allinux@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
150 lines
4.8 KiB
Makefile
150 lines
4.8 KiB
Makefile
# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies.
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 1994 by Linus Torvalds
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# Changes for PPC by Gary Thomas
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# Rewritten by Cort Dougan and Paul Mackerras
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#
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# This must match PAGE_OFFSET in include/asm-ppc/page.h.
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KERNELLOAD := $(CONFIG_KERNEL_START)
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HAS_BIARCH := $(call cc-option-yn, -m32)
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ifeq ($(HAS_BIARCH),y)
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AS := $(AS) -a32
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LD := $(LD) -m elf32ppc
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CC := $(CC) -m32
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endif
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LDFLAGS_vmlinux := -Ttext $(KERNELLOAD) -Bstatic
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# The -Iarch/$(ARCH)/include is temporary while we are merging
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CPPFLAGS += -Iarch/$(ARCH) -Iarch/$(ARCH)/include
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AFLAGS += -Iarch/$(ARCH)
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CFLAGS += -Iarch/$(ARCH) -msoft-float -pipe \
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-ffixed-r2 -mmultiple
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# No AltiVec instruction when building kernel
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CFLAGS += $(call cc-option, -mno-altivec)
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CPP = $(CC) -E $(CFLAGS)
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# Temporary hack until we have migrated to asm-powerpc
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LINUXINCLUDE += -Iarch/$(ARCH)/include
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CHECKFLAGS += -D__powerpc__
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ifndef CONFIG_FSL_BOOKE
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CFLAGS += -mstring
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endif
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cpu-as-$(CONFIG_PPC64BRIDGE) += -Wa,-mppc64bridge
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cpu-as-$(CONFIG_4xx) += -Wa,-m405
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cpu-as-$(CONFIG_6xx) += -Wa,-maltivec
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cpu-as-$(CONFIG_POWER4) += -Wa,-maltivec
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cpu-as-$(CONFIG_E500) += -Wa,-me500
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cpu-as-$(CONFIG_E200) += -Wa,-me200
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AFLAGS += $(cpu-as-y)
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CFLAGS += $(cpu-as-y)
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# Default to the common case.
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KBUILD_DEFCONFIG := common_defconfig
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head-y := arch/ppc/kernel/head.o
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head-$(CONFIG_8xx) := arch/ppc/kernel/head_8xx.o
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head-$(CONFIG_4xx) := arch/ppc/kernel/head_4xx.o
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head-$(CONFIG_44x) := arch/ppc/kernel/head_44x.o
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head-$(CONFIG_FSL_BOOKE) := arch/ppc/kernel/head_fsl_booke.o
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head-$(CONFIG_6xx) += arch/ppc/kernel/idle_6xx.o
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head-$(CONFIG_POWER4) += arch/ppc/kernel/idle_power4.o
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head-$(CONFIG_PPC_FPU) += arch/powerpc/kernel/fpu.o
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core-y += arch/ppc/kernel/ arch/powerpc/kernel/ \
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arch/ppc/platforms/ \
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arch/ppc/mm/ arch/ppc/lib/ \
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arch/ppc/syslib/ arch/powerpc/sysdev/
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core-$(CONFIG_4xx) += arch/ppc/platforms/4xx/
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core-$(CONFIG_83xx) += arch/ppc/platforms/83xx/
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core-$(CONFIG_85xx) += arch/ppc/platforms/85xx/
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core-$(CONFIG_MATH_EMULATION) += arch/ppc/math-emu/
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core-$(CONFIG_XMON) += arch/ppc/xmon/
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core-$(CONFIG_APUS) += arch/ppc/amiga/
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drivers-$(CONFIG_8xx) += arch/ppc/8xx_io/
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drivers-$(CONFIG_4xx) += arch/ppc/4xx_io/
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drivers-$(CONFIG_CPM2) += arch/ppc/8260_io/
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drivers-$(CONFIG_OPROFILE) += arch/powerpc/oprofile/
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BOOT_TARGETS = zImage zImage.initrd znetboot znetboot.initrd vmlinux.sm
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.PHONY: $(BOOT_TARGETS)
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all: uImage zImage
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CPPFLAGS_vmlinux.lds := -Upowerpc
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# All the instructions talk about "make bzImage".
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bzImage: zImage
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boot := arch/$(ARCH)/boot
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$(BOOT_TARGETS): vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $@
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uImage: vmlinux
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$(Q)$(MAKE) $(build)=$(boot)/images $(boot)/images/$@
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define archhelp
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@echo '* zImage - Compressed kernel image (arch/$(ARCH)/boot/images/zImage.*)'
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@echo ' uImage - Create a bootable image for U-Boot / PPCBoot'
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@echo ' install - Install kernel using'
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@echo ' (your) ~/bin/installkernel or'
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@echo ' (distribution) /sbin/installkernel or'
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@echo ' install to $$(INSTALL_PATH) and run lilo'
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@echo ' *_defconfig - Select default config from arch/$(ARCH)/ppc/configs'
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endef
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archclean:
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$(Q)$(MAKE) $(clean)=arch/ppc/boot
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# Temporary hack until we have migrated to asm-powerpc
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$(Q)rm -rf arch/$(ARCH)/include
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archprepare: checkbin
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# Temporary hack until we have migrated to asm-powerpc
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include/asm: arch/$(ARCH)/include/asm
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arch/$(ARCH)/include/asm:
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$(Q)if [ ! -d arch/$(ARCH)/include ]; then mkdir -p arch/$(ARCH)/include; fi
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$(Q)ln -fsn $(srctree)/include/asm-powerpc arch/$(ARCH)/include/asm
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# Use the file '.tmp_gas_check' for binutils tests, as gas won't output
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# to stdout and these checks are run even on install targets.
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TOUT := .tmp_gas_check
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# Ensure this is binutils 2.12.1 (or 2.12.90.0.7) or later for altivec
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# instructions.
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# gcc-3.4 and binutils-2.14 are a fatal combination.
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GCC_VERSION := $(call cc-version)
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checkbin:
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@if test "$(GCC_VERSION)" = "0304" ; then \
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if ! /bin/echo mftb 5 | $(AS) -v -mppc -many -o $(TOUT) >/dev/null 2>&1 ; then \
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echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build '; \
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echo 'correctly with gcc-3.4 and your version of binutils.'; \
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echo '*** Please upgrade your binutils or downgrade your gcc'; \
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false; \
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fi ; \
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fi
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@if ! /bin/echo dssall | $(AS) -many -o $(TOUT) >/dev/null 2>&1 ; then \
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echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build ' ; \
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echo 'correctly with old versions of binutils.' ; \
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echo '*** Please upgrade your binutils to 2.12.1 or newer' ; \
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false ; \
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fi
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CLEAN_FILES += $(TOUT)
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