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author | Glauber de Oliveira Costa <gcosta@redhat.com> | 2008-01-30 13:31:03 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:31:03 +0100 |
commit | c758ecf62ad94ddfeb4e7d8a5498bdcb2e3c85db (patch) | |
tree | 6a7b8b629bbe935c78cf3933b0cfe25253c563a9 /include/asm-x86/processor.h | |
parent | x86: split get_cycles_sync (diff) | |
download | linux-c758ecf62ad94ddfeb4e7d8a5498bdcb2e3c85db.tar.xz linux-c758ecf62ad94ddfeb4e7d8a5498bdcb2e3c85db.zip |
x86: unify cpuid functions
cpuid is not very different between i386 and x86_64.
We move away the x86_64 version from msr.h, and
unify them at processor.h, where they belong.
cpuid() paravirt then comes for free.
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/asm-x86/processor.h')
-rw-r--r-- | include/asm-x86/processor.h | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/include/asm-x86/processor.h b/include/asm-x86/processor.h index 46e1c04e309c..dea81b70895d 100644 --- a/include/asm-x86/processor.h +++ b/include/asm-x86/processor.h @@ -1,5 +1,83 @@ +#ifndef __ASM_X86_PROCESSOR_H +#define __ASM_X86_PROCESSOR_H + +static inline void native_cpuid(unsigned int *eax, unsigned int *ebx, + unsigned int *ecx, unsigned int *edx) +{ + /* ecx is often an input as well as an output. */ + __asm__("cpuid" + : "=a" (*eax), + "=b" (*ebx), + "=c" (*ecx), + "=d" (*edx) + : "0" (*eax), "2" (*ecx)); +} + + #ifdef CONFIG_X86_32 # include "processor_32.h" #else # include "processor_64.h" #endif + +#ifndef CONFIG_PARAVIRT +#define __cpuid native_cpuid +#endif + +/* + * Generic CPUID function + * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx + * resulting in stale register contents being returned. + */ +static inline void cpuid(unsigned int op, + unsigned int *eax, unsigned int *ebx, + unsigned int *ecx, unsigned int *edx) +{ + *eax = op; + *ecx = 0; + __cpuid(eax, ebx, ecx, edx); +} + +/* Some CPUID calls want 'count' to be placed in ecx */ +static inline void cpuid_count(unsigned int op, int count, + unsigned int *eax, unsigned int *ebx, + unsigned int *ecx, unsigned int *edx) +{ + *eax = op; + *ecx = count; + __cpuid(eax, ebx, ecx, edx); +} + +/* + * CPUID functions returning a single datum + */ +static inline unsigned int cpuid_eax(unsigned int op) +{ + unsigned int eax, ebx, ecx, edx; + + cpuid(op, &eax, &ebx, &ecx, &edx); + return eax; +} +static inline unsigned int cpuid_ebx(unsigned int op) +{ + unsigned int eax, ebx, ecx, edx; + + cpuid(op, &eax, &ebx, &ecx, &edx); + return ebx; +} +static inline unsigned int cpuid_ecx(unsigned int op) +{ + unsigned int eax, ebx, ecx, edx; + + cpuid(op, &eax, &ebx, &ecx, &edx); + return ecx; +} +static inline unsigned int cpuid_edx(unsigned int op) +{ + unsigned int eax, ebx, ecx, edx; + + cpuid(op, &eax, &ebx, &ecx, &edx); + return edx; +} + +#endif |