x86/cpufeatures: Enable cpuid for Intel SHA extensions

Add Intel CPUID for Intel Secure Hash Algorithm Extensions. This feature
provides new instructions for accelerated computation of SHA-1 and SHA-256.
This allows the feature to be shown in the /proc/cpuinfo for cpus that
support it.

Refer to SHA extension programming guide in chapter 8.2 of the Intel
Architecture Instruction Set Extensions Programming reference
for definition of this feature's cpuid: CPUID.(EAX=07H, ECX=0):EBX.SHA [bit 29] = 1
https://software.intel.com/sites/default/files/managed/07/b7/319433-023.pdf

Originally-by: Chandramouli Narayanan <[email protected]>
Signed-off-by: Tim Chen <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Herbert Xu <[email protected]>
Link: http://lkml.kernel.org/r/1440194206.3940.6.camel@schen9-mobl2
Signed-off-by: Thomas Gleixner <[email protected]>

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 3d6606fb97d05496d21ea93c0030a5f7aa109516..a94f83d4272a2501c4859b15365a774ec8915918 100644 (file)
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -239,6 +239,7 @@
 #define X86_FEATURE_AVX512PF   ( 9*32+26) /* AVX-512 Prefetch */
 #define X86_FEATURE_AVX512ER   ( 9*32+27) /* AVX-512 Exponential and Reciprocal */
 #define X86_FEATURE_AVX512CD   ( 9*32+28) /* AVX-512 Conflict Detection */
+#define X86_FEATURE_SHA_NI     ( 9*32+29) /* SHA1/SHA256 Instruction Extensions */
 
 /* Extended state features, CPUID level 0x0000000d:1 (eax), word 10 */
 #define X86_FEATURE_XSAVEOPT   (10*32+ 0) /* XSAVEOPT */