Unify the CPU features vectors between i386 and x86-64

Unify the handling of the CPU features vectors between i386 and x86-64.
This also adopts the collapsing of features which are required at
compile-time into constant tests from x86-64 to i386.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 12 insertions, 5 deletions

diff --git a/include/asm-i386/cpufeature.h b/include/asm-i386/cpufeature.h
index f514e906643a..7ea5f4a6706f 100644
--- a/include/asm-i386/cpufeature.h
+++ b/include/asm-i386/cpufeature.h
@@ -81,6 +81,7 @@
 #define X86_FEATURE_BTS         (3*32+13)  /* Branch Trace Store */
 #define X86_FEATURE_LAPIC_TIMER_BROKEN (3*32+ 14) /* lapic timer broken in C1 */
 #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 */
 
 /* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
 #define X86_FEATURE_XMM3        (4*32+ 0) /* Streaming SIMD Extensions-3 */
@@ -108,11 +109,17 @@
 #define X86_FEATURE_LAHF_LM     (6*32+ 0) /* LAHF/SAHF in long mode */
 #define X86_FEATURE_CMP_LEGACY  (6*32+ 1) /* If yes HyperThreading not valid */
 
-#define cpu_has(c, bit)                                 \
-        ((__builtin_constant_p(bit) && (bit) < 32 &&    \
-                (1UL << (bit)) & REQUIRED_MASK1) ?      \
-                1 :                                     \
-        test_bit(bit, (c)->x86_capability))
+#define cpu_has(c, bit)                                                 \
+        (__builtin_constant_p(bit) &&                                   \
+         ( (((bit)>>5)==0 && (1UL<<((bit)&31) & REQUIRED_MASK0)) ||     \
+           (((bit)>>5)==1 && (1UL<<((bit)&31) & REQUIRED_MASK1)) ||     \
+           (((bit)>>5)==2 && (1UL<<((bit)&31) & REQUIRED_MASK2)) ||     \
+           (((bit)>>5)==3 && (1UL<<((bit)&31) & REQUIRED_MASK3)) ||     \
+           (((bit)>>5)==4 && (1UL<<((bit)&31) & REQUIRED_MASK4)) ||     \
+           (((bit)>>5)==5 && (1UL<<((bit)&31) & REQUIRED_MASK5)) ||     \
+           (((bit)>>5)==6 && (1UL<<((bit)&31) & REQUIRED_MASK6)) )      \
+          ? 1 :                                                         \
+          test_bit(bit, (c)->x86_capability))
 #define boot_cpu_has(bit)       cpu_has(&boot_cpu_data, bit)
 
 #define cpu_has_fpu             boot_cpu_has(X86_FEATURE_FPU)