From ee58fad51a2a767cb2567706ace967705233d881 Mon Sep 17 00:00:00 2001 From: Stephane Eranian Date: Thu, 7 Dec 2006 02:14:11 +0100 Subject: [PATCH] [PATCH] x86-64: x86-64 add Intel BTS cpufeature bit and detection (take 2) Here is a small patch for x86-64 which adds a cpufeature flag and detection code for Intel's Branch Trace Store (BTS) feature. This feature can be found on Intel P4 and Core 2 processors among others. It can also be used by perfmon. changelog: - add CPU_FEATURE_BTS - add Branch Trace Store detection signed-off-by: stephane eranian Signed-off-by: Andi Kleen --- arch/x86_64/kernel/setup.c | 2 ++ include/asm-x86_64/cpufeature.h | 2 ++ 2 files changed, 4 insertions(+) diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c index 619af2e2fa2..a570c81c831 100644 --- a/arch/x86_64/kernel/setup.c +++ b/arch/x86_64/kernel/setup.c @@ -838,6 +838,8 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c) if (cpu_has_ds) { unsigned int l1, l2; rdmsr(MSR_IA32_MISC_ENABLE, l1, l2); + if (!(l1 & (1<<11))) + set_bit(X86_FEATURE_BTS, c->x86_capability); if (!(l1 & (1<<12))) set_bit(X86_FEATURE_PEBS, c->x86_capability); } diff --git a/include/asm-x86_64/cpufeature.h b/include/asm-x86_64/cpufeature.h index d280384807e..0b3c686139f 100644 --- a/include/asm-x86_64/cpufeature.h +++ b/include/asm-x86_64/cpufeature.h @@ -69,6 +69,7 @@ #define X86_FEATURE_UP (3*32+8) /* SMP kernel running on UP */ #define X86_FEATURE_ARCH_PERFMON (3*32+9) /* Intel Architectural PerfMon */ #define X86_FEATURE_PEBS (3*32+10) /* Precise-Event Based Sampling */ +#define X86_FEATURE_BTS (3*32+11) /* Branch Trace Store */ /* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */ #define X86_FEATURE_XMM3 (4*32+ 0) /* Streaming SIMD Extensions-3 */ @@ -115,5 +116,6 @@ #define cpu_has_clflush boot_cpu_has(X86_FEATURE_CLFLSH) #define cpu_has_ds boot_cpu_has(X86_FEATURE_DS) #define cpu_has_pebs boot_cpu_has(X86_FEATURE_PEBS) +#define cpu_has_bts boot_cpu_has(X86_FEATURE_BTS) #endif /* __ASM_X8664_CPUFEATURE_H */ -- 2.11.4.GIT