Commit 8d02c211 authored by Thomas Petazzoni's avatar Thomas Petazzoni Committed by Ingo Molnar
Browse files

x86: configuration options to compile out x86 CPU support code 



This patch adds some configuration options that allow to compile out
CPU vendor-specific code in x86 kernels (in arch/x86/kernel/cpu). The
new configuration options are only visible when CONFIG_EMBEDDED is
selected, as they are mostly interesting for space savings reasons.

An example of size saving, on x86 with only Intel CPU support:

   text	   data	    bss	    dec	    hex	filename
1125479	 118760	 212992	1457231	 163c4f	vmlinux.old
1121355	 116536	 212992	1450883	 162383	vmlinux
  -4124   -2224       0   -6348   -18CC +/-

However, I'm not exactly sure that the Kconfig wording is correct with
regard to !64BIT / 64BIT.

[ mingo@elte.hu: convert macro to inline ]

Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 774400a3

arch/x86/Kconfig.cpu

+70 −0
Original line number Diff line number Diff line
@@ -415,3 +415,73 @@ config X86_MINIMUM_CPU_FAMILY 
config X86_DEBUGCTLMSR

	def_bool y

	depends on !(MK6 || MWINCHIPC6 || MWINCHIP2 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486 || M386)



menuconfig PROCESSOR_SELECT

	default y

	bool "Supported processor vendors" if EMBEDDED

	help

	  This lets you choose what x86 vendor support code your kernel

	  will include.



config CPU_SUP_INTEL_32

	default y

	bool "Support Intel processors" if PROCESSOR_SELECT

	depends on !64BIT

	help

	  This enables extended support for Intel processors



config CPU_SUP_INTEL_64

	default y

	bool "Support Intel processors" if PROCESSOR_SELECT

	depends on 64BIT

	help

	  This enables extended support for Intel processors



config CPU_SUP_CYRIX_32

	default y

	bool "Support Cyrix processors" if PROCESSOR_SELECT

	depends on !64BIT

	help

	  This enables extended support for Cyrix processors



config CPU_SUP_AMD_32

	default y

	bool "Support AMD processors" if PROCESSOR_SELECT

	depends on !64BIT

	help

	  This enables extended support for AMD processors



config CPU_SUP_AMD_64

	default y

	bool "Support AMD processors" if PROCESSOR_SELECT

	depends on 64BIT

	help

	  This enables extended support for AMD processors



config CPU_SUP_CENTAUR_32

	default y

	bool "Support Centaur processors" if PROCESSOR_SELECT

	depends on !64BIT

	help

	  This enables extended support for Centaur processors



config CPU_SUP_CENTAUR_64

	default y

	bool "Support Centaur processors" if PROCESSOR_SELECT

	depends on 64BIT

	help

	  This enables extended support for Centaur processors



config CPU_SUP_TRANSMETA_32

	default y

	bool "Support Transmeta processors" if PROCESSOR_SELECT

	depends on !64BIT

	help

	  This enables extended support for Transmeta processors



config CPU_SUP_UMC_32

	default y

	bool "Support UMC processors" if PROCESSOR_SELECT

	depends on !64BIT

	help

	  This enables extended support for UMC processors

arch/x86/kernel/cpu/Makefile

+10 −9
Original line number Diff line number Diff line
@@ -7,15 +7,16 @@ obj-y += proc.o feature_names.o 


obj-$(CONFIG_X86_32)	+= common.o bugs.o cmpxchg.o

obj-$(CONFIG_X86_64)	+= common_64.o bugs_64.o

obj-$(CONFIG_X86_32)	+= amd.o

obj-$(CONFIG_X86_64)	+= amd_64.o

obj-$(CONFIG_X86_32)	+= cyrix.o

obj-$(CONFIG_X86_32)	+= centaur.o

obj-$(CONFIG_X86_64)	+= centaur_64.o

obj-$(CONFIG_X86_32)	+= transmeta.o

obj-$(CONFIG_X86_32)	+= intel.o

obj-$(CONFIG_X86_64)	+= intel_64.o

obj-$(CONFIG_X86_32)	+= umc.o



obj-$(CONFIG_CPU_SUP_AMD_32)		+= amd.o

obj-$(CONFIG_CPU_SUP_AMD_64)		+= amd_64.o

obj-$(CONFIG_CPU_SUP_CYRIX_32)		+= cyrix.o

obj-$(CONFIG_CPU_SUP_CENTAUR_32)	+= centaur.o

obj-$(CONFIG_CPU_SUP_CENTAUR_64)	+= centaur_64.o

obj-$(CONFIG_CPU_SUP_TRANSMETA_32)	+= transmeta.o

obj-$(CONFIG_CPU_SUP_INTEL_32)		+= intel.o

obj-$(CONFIG_CPU_SUP_INTEL_64)		+= intel_64.o

obj-$(CONFIG_CPU_SUP_UMC_32)		+= umc.o



obj-$(CONFIG_X86_MCE)	+= mcheck/

obj-$(CONFIG_MTRR)	+= mtrr/

include/asm-x86/bugs.h

+5 −0
Original line number Diff line number Diff line
@@ -2,6 +2,11 @@ 
#define _ASM_X86_BUGS_H



extern void check_bugs(void);



#ifdef CONFIG_CPU_SUP_INTEL_32

int ppro_with_ram_bug(void);

#else

static inline int ppro_with_ram_bug(void) { return 0; }

#endif



#endif /* _ASM_X86_BUGS_H */

CRA Git | Maintained and supported by SUSTech CRA and CCSE