diff options
| author | Andi Kleen <ak@suse.de> | 2007-05-02 21:27:20 +0400 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 21:27:20 +0400 |
| commit | 72b1b1d0133d7eb4040697f1052bf92123fb051b (patch) | |
| tree | 864d2e7ad0c0cc4a5196dfbf110b72f22439bc76 /arch/x86_64 | |
| parent | 4637a74cf2ac3a3696d385c8624d84de789d1bbe (diff) | |
| download | linux-72b1b1d0133d7eb4040697f1052bf92123fb051b.tar.xz | |
[PATCH] x86-64: Use symbolic CPU features in early CPUID check
Dead to magic numbers!
Generated code is the same.
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/x86_64')
| -rw-r--r-- | arch/x86_64/kernel/verify_cpu.S | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/arch/x86_64/kernel/verify_cpu.S b/arch/x86_64/kernel/verify_cpu.S index 72edabd2ef9a..e035f5948199 100644 --- a/arch/x86_64/kernel/verify_cpu.S +++ b/arch/x86_64/kernel/verify_cpu.S @@ -30,18 +30,27 @@ * appropriately. Either display a message or halt. */ -verify_cpu: +#include <asm/cpufeature.h> +verify_cpu: pushfl # Save caller passed flags pushl $0 # Kill any dangerous flags popfl - /* minimum CPUID flags for x86-64 */ - /* see http://www.x86-64.org/lists/discuss/msg02971.html */ -#define SSE_MASK ((1<<25)|(1<<26)) -#define REQUIRED_MASK1 ((1<<0)|(1<<3)|(1<<4)|(1<<5)|(1<<6)|(1<<8)|\ - (1<<13)|(1<<15)|(1<<24)) -#define REQUIRED_MASK2 (1<<29) + /* minimum CPUID flags for x86-64 as defined by AMD */ +#define M(x) (1<<(x)) +#define M2(a,b) M(a)|M(b) +#define M4(a,b,c,d) M(a)|M(b)|M(c)|M(d) + +#define SSE_MASK \ + (M2(X86_FEATURE_XMM,X86_FEATURE_XMM2)) +#define REQUIRED_MASK1 \ + (M4(X86_FEATURE_FPU,X86_FEATURE_PSE,X86_FEATURE_TSC,X86_FEATURE_MSR)|\ + M4(X86_FEATURE_PAE,X86_FEATURE_CX8,X86_FEATURE_PGE,X86_FEATURE_CMOV)|\ + M(X86_FEATURE_FXSR)) +#define REQUIRED_MASK2 \ + (M(X86_FEATURE_LM - 32)) + pushfl # standard way to check for cpuid popl %eax movl %eax,%ebx |