VEX/useful/cpuid.c

   1
   2 #include <stdio.h>
   3
   4 typedef  unsigned int            UInt;
   5 typedef  unsigned long long int  ULong;
   6
   7 void cpuid ( UInt* eax, UInt* ebx, UInt* ecx, UInt* edx,
   8              UInt index, UInt ecx_in )
   9 {
  10    UInt a,b,c,d;
  11    asm volatile ("cpuid"
  12                  : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \
  13                  : "0" (index), "2"(ecx_in) );
  14    *eax = a; *ebx = b; *ecx = c; *edx = d;
  15    printf("%08x %08x -> %08x %08x %08x %08x\n",
  16           index,ecx_in, a,b,c,d );
  17 }
  18
  19 int main ( void )
  20 {
  21   UInt eax, ebx, ecx, edx;
  22   UInt maxidx, maxextidx, i,ecx_in;
  23
  24   printf("\n");
  25   cpuid(&eax,&ebx,&ecx,&edx, 0,0);
  26   maxidx = eax;
  27   for (i = 1; i <= maxidx +5; i++) {
  28
  29     UInt subleaf = 0;
  30
  31     if (i == 4) subleaf = 10;
  32     if (i == 7) subleaf = 10;
  33     if (i == 0xB) subleaf = 10;
  34     if (i == 0xD) subleaf = 10;
  35
  36     if (subleaf > 0) printf("\n");
  37
  38     cpuid(&eax,&ebx,&ecx,&edx, i,0);
  39
  40     for (ecx_in = 1; ecx_in < subleaf; ecx_in++) {
  41        cpuid(&eax,&ebx,&ecx,&edx, i,ecx_in);
  42     }
  43
  44     if (subleaf > 0) printf("\n");
  45
  46   }
  47
  48   printf("\n");
  49
  50   cpuid(&eax,&ebx,&ecx,&edx, 0x80000000,0);
  51   maxextidx = eax;
  52   for (i = 0x80000001; i <= maxextidx +5; i++) {
  53      cpuid(&eax,&ebx,&ecx,&edx, i,0);
  54   }
  55
  56   printf("invalid\n");
  57   cpuid(&eax,&ebx,&ecx,&edx, 1234,0);
  58   cpuid(&eax,&ebx,&ecx,&edx, 0x800004d3,0);
  59
  60
  61   return 0;
  62 }