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

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
......@@ -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
......@@ -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/
......
......@@ -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 */
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment