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authorAndi Kleen <ak@suse.de>2008-01-30 13:32:37 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:32:37 +0100
commitde4218634e3df6d73a3e6cdfdf3a17fa3bc7e013 (patch)
treedf7438f5ee81fc7c93f5e9ab3f4249a5afc3d31c /include/asm-x86
parent27efeb67714608b28c0b213cceb6080749435c6b (diff)
x86: implement support to synchronize RDTSC through MFENCE on AMD CPUs
According to AMD RDTSC can be synchronized through MFENCE. Implement the necessary CPUID bit for that. Cc: andreas.herrmann3@amd.com Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/asm-x86')
-rw-r--r--include/asm-x86/cpufeature.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-x86/cpufeature.h b/include/asm-x86/cpufeature.h
index 75e2f78a7fda..7d53eea8b946 100644
--- a/include/asm-x86/cpufeature.h
+++ b/include/asm-x86/cpufeature.h
@@ -79,6 +79,7 @@
/* 14 free */
#define X86_FEATURE_SYNC_RDTSC (3*32+15) /* RDTSC synchronizes the CPU */
#define X86_FEATURE_REP_GOOD (3*32+16) /* rep microcode works well on this CPU */
+#define X86_FEATURE_MFENCE_RDTSC (3*32+17) /* Mfence synchronizes RDTSC */
/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
#define X86_FEATURE_XMM3 (4*32+ 0) /* Streaming SIMD Extensions-3 */