[PATCH 3/4] powerpc: Add 64-bit CPU targets for gcc

[Kumar Gala]

On Apr 17, 2012, at 11:45 PM, Anton Blanchard wrote:

> 
> 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: Anton Blanchard <anton at samba.org>
> ---

Can you add a target for e5500 cpu.

- k

> 
> Index: linux-build/arch/powerpc/Makefile
> ===================================================================
> --- linux-build.orig/arch/powerpc/Makefile	2012-04-18 14:31:31.614666419 +1000
> +++ linux-build/arch/powerpc/Makefile	2012-04-18 14:37:08.680708678 +1000
> @@ -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)
> Index: linux-build/arch/powerpc/platforms/Kconfig.cputype
> ===================================================================
> --- linux-build.orig/arch/powerpc/platforms/Kconfig.cputype	2012-04-18 14:31:25.134549903 +1000
> +++ linux-build/arch/powerpc/platforms/Kconfig.cputype	2012-04-18 14:36:40.576207829 +1000
> @@ -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
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