include/asm-x86/processor.h

   1 #ifndef __ASM_X86_PROCESSOR_H
   2 #define __ASM_X86_PROCESSOR_H
   3
   4 static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
   5                                          unsigned int *ecx, unsigned int *edx)
   6 {
   7         /* ecx is often an input as well as an output. */
   8         __asm__("cpuid"
   9                 : "=a" (*eax),
  10                   "=b" (*ebx),
  11                   "=c" (*ecx),
  12                   "=d" (*edx)
  13                 : "0" (*eax), "2" (*ecx));
  14 }
  15
  16
  17 #ifdef CONFIG_X86_32
  18 # include "processor_32.h"
  19 #else
  20 # include "processor_64.h"
  21 #endif
  22
  23 #ifndef CONFIG_PARAVIRT
  24 #define __cpuid native_cpuid
  25 #endif
  26
  27 /*
  28  * Generic CPUID function
  29  * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
  30  * resulting in stale register contents being returned.
  31  */
  32 static inline void cpuid(unsigned int op,
  33                          unsigned int *eax, unsigned int *ebx,
  34                          unsigned int *ecx, unsigned int *edx)
  35 {
  36         *eax = op;
  37         *ecx = 0;
  38         __cpuid(eax, ebx, ecx, edx);
  39 }
  40
  41 /* Some CPUID calls want 'count' to be placed in ecx */
  42 static inline void cpuid_count(unsigned int op, int count,
  43                                unsigned int *eax, unsigned int *ebx,
  44                                unsigned int *ecx, unsigned int *edx)
  45 {
  46         *eax = op;
  47         *ecx = count;
  48         __cpuid(eax, ebx, ecx, edx);
  49 }
  50
  51 /*
  52  * CPUID functions returning a single datum
  53  */
  54 static inline unsigned int cpuid_eax(unsigned int op)
  55 {
  56         unsigned int eax, ebx, ecx, edx;
  57
  58         cpuid(op, &eax, &ebx, &ecx, &edx);
  59         return eax;
  60 }
  61 static inline unsigned int cpuid_ebx(unsigned int op)
  62 {
  63         unsigned int eax, ebx, ecx, edx;
  64
  65         cpuid(op, &eax, &ebx, &ecx, &edx);
  66         return ebx;
  67 }
  68 static inline unsigned int cpuid_ecx(unsigned int op)
  69 {
  70         unsigned int eax, ebx, ecx, edx;
  71
  72         cpuid(op, &eax, &ebx, &ecx, &edx);
  73         return ecx;
  74 }
  75 static inline unsigned int cpuid_edx(unsigned int op)
  76 {
  77         unsigned int eax, ebx, ecx, edx;
  78
  79         cpuid(op, &eax, &ebx, &ecx, &edx);
  80         return edx;
  81 }
  82
  83 #endif