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Commit d23c6fb4 authored by Anton Blanchard's avatar Anton Blanchard Committed by Benjamin Herrenschmidt
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powerpc: Add 64-bit CPU targets for gcc 



Add a menu to select various 64-bit CPU targets for gcc. We
default to -mtune=power7 and if gcc doesn't understand that we
fallback to -mtune=power4.

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 894a65c8

arch/powerpc/Makefile

+12 −13
Original line number Diff line number Diff line
@@ -69,6 +69,16 @@ LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y) 


CFLAGS-$(CONFIG_PPC64)	:= -mminimal-toc -mtraceback=no -mcall-aixdesc

CFLAGS-$(CONFIG_PPC32)	:= -ffixed-r2 -mmultiple



CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,-mtune=power4)

CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)

CFLAGS-$(CONFIG_POWER4_CPU) += $(call cc-option,-mcpu=power4)

CFLAGS-$(CONFIG_POWER5_CPU) += $(call cc-option,-mcpu=power5)

CFLAGS-$(CONFIG_POWER6_CPU) += $(call cc-option,-mcpu=power6)

CFLAGS-$(CONFIG_POWER7_CPU) += $(call cc-option,-mcpu=power7)



CFLAGS-$(CONFIG_TUNE_CELL) += $(call cc-option,-mtune=cell)



KBUILD_CPPFLAGS	+= -Iarch/$(ARCH)

KBUILD_AFLAGS	+= -Iarch/$(ARCH)

KBUILD_CFLAGS	+= -msoft-float -pipe -Iarch/$(ARCH) $(CFLAGS-y)
@@ -76,22 +86,11 @@ CPP = $(CC) -E $(KBUILD_CFLAGS) 


CHECKFLAGS	+= -m$(CONFIG_WORD_SIZE) -D__powerpc__ -D__powerpc$(CONFIG_WORD_SIZE)__



ifeq ($(CONFIG_PPC64),y)

ifeq ($(CONFIG_POWER4_ONLY),y)

	KBUILD_CFLAGS += $(call cc-option,-mcpu=power4)

else

	KBUILD_CFLAGS += $(call cc-option,-mtune=power4)

endif

endif



KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o



ifeq ($(CONFIG_TUNE_CELL),y)

	KBUILD_CFLAGS += $(call cc-option,-mtune=cell)

endif



# No AltiVec instruction when building kernel

# No AltiVec or VSX instructions when building kernel

KBUILD_CFLAGS += $(call cc-option,-mno-altivec)

KBUILD_CFLAGS += $(call cc-option,-mno-vsx)



# No SPE instruction when building kernel

# (We use all available options to help semi-broken compilers)

arch/powerpc/platforms/Kconfig.cputype

+30 −0
Original line number Diff line number Diff line
@@ -78,6 +78,36 @@ config PPC_BOOK3E_64 


endchoice



choice

	prompt "CPU selection"

	depends on PPC64

	default GENERIC_CPU

	help

	  This will create a kernel which is optimised for a particular CPU.

	  The resulting kernel may not run on other CPUs, so use this with care.



	  If unsure, select Generic.



config GENERIC_CPU

	bool "Generic"



config CELL_CPU

	bool "Cell Broadband Engine"



config POWER4_CPU

	bool "POWER4"



config POWER5_CPU

	bool "POWER5"



config POWER6_CPU

	bool "POWER6"



config POWER7_CPU

	bool "POWER7"



endchoice



config PPC_BOOK3S

	def_bool y

	depends on PPC_BOOK3S_32 || PPC_BOOK3S_64