Messages in this thread Patch in this message | | | From | "Fenghua Yu" <> | Subject | [PATCH 1/9] x86, cpu: Enable enhanced REP MOVSB/STOSB feature | Date | Tue, 17 May 2011 15:29:10 -0700 |
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From: Fenghua Yu <fenghua.yu@intel.com>
Intel processors are adding enhancements to REP MOVSB/STOSB and the use of REP MOVSB/STOSB for optimal memcpy/memset or similar functions is recommended. Enhancement availability is indicated by CPUID.7.0.EBX[9] (Enhanced REP MOVSB/ STOSB).
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> --- arch/x86/include/asm/cpufeature.h | 1 + 1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h index 50c0d30..30afb46 100644 --- a/arch/x86/include/asm/cpufeature.h +++ b/arch/x86/include/asm/cpufeature.h @@ -195,6 +195,7 @@ /* Intel-defined CPU features, CPUID level 0x00000007:0 (ebx), word 9 */ #define X86_FEATURE_FSGSBASE (9*32+ 0) /* {RD/WR}{FS/GS}BASE instructions*/ +#define X86_FEATURE_ERMS (9*32+ 9) /* Enhanced REP MOVSB/STOSB */ #if defined(__KERNEL__) && !defined(__ASSEMBLY__) -- 1.7.2
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