[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 <eranian@hpl.hp.com>

Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/asm-x86_64/cpufeature.h b/include/asm-x86_64/cpufeature.h
index d280384807ef..0b3c686139f1 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 */