x86, cpu: Support the features flags in new CPUID leaf 7
Intel has defined CPUID leaf 7 as the next set of feature flags (see
the AVX specification, version 007). Add support for this new feature
flags word.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
LKML-Reference: <tip-*@vger.kernel.org>
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 68e4a6f..c735830 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -551,6 +551,16 @@
c->x86_capability[4] = excap;
}
+ /* Additional Intel-defined flags: level 0x00000007 */
+ if (c->cpuid_level >= 0x00000007) {
+ u32 eax, ebx, ecx, edx;
+
+ cpuid_count(0x00000007, 0, &eax, &ebx, &ecx, &edx);
+
+ if (eax > 0)
+ c->x86_capability[9] = ebx;
+ }
+
/* AMD-defined flags: level 0x80000001 */
xlvl = cpuid_eax(0x80000000);
c->extended_cpuid_level = xlvl;