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Simple test to try cpuid instruction at level 2

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Dr-Noob
2018-03-24 17:02:36 +01:00
commit bb0fde5c8b
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cpuidtest.c Normal file
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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 volatile("cpuid"
: "=a" (*eax),
"=b" (*ebx),
"=c" (*ecx),
"=d" (*edx)
: "0" (*eax), "2" (*ecx));
}
#include <stdio.h>
int main(int argc, char **argv)
{
unsigned mask1 = 0xFF;
unsigned mask2 = 0xFF00;
unsigned mask3 = 0xFF0000;
unsigned mask4 = 0xFF000000;
unsigned eax, ebx, ecx, edx;
eax = 2; /* processor info and feature bits */
native_cpuid(&eax, &ebx, &ecx, &edx);
/*
printf("AL = 0x%x\n",eax & 0xFF);
printf("0x%x(0x%x)\n",eax, (1 << 31) & eax);
printf("0x%x(0x%x)\n",ebx, (1 << 31) & ebx);
printf("0x%x(0x%x)\n",ecx, (1 << 31) & ecx);
printf("0x%x(0x%x)\n",edx, (1 << 31) & edx);
*/
printf("eax[0]=0x%x\neax[1]=0x%x\neax[2]=0x%x\neax[3]=0x%x\n",eax & mask1, eax & mask2, eax & mask3, eax & mask4);
printf("ebx[0]=0x%x\nebx[1]=0x%x\nebx[2]=0x%x\nebx[3]=0x%x\n",ebx & mask1, ebx & mask2, ebx & mask3, ebx & mask4);
printf("ecx[0]=0x%x\necx[1]=0x%x\necx[2]=0x%x\necx[3]=0x%x\n",ecx & mask1, ecx & mask2, ecx & mask3, ecx & mask4);
printf("edx[0]=0x%x\nedx[1]=0x%x\nedx[2]=0x%x\nedx[3]=0x%x\n",edx & mask1, edx & mask2, edx & mask3, edx & mask4);
/*
if(((eax >> 31) & 1U) == 0)
printf("eax valid\n");
if(((ebx >> 31) & 1U) == 0)
printf("ebx valid\n");
if(((ecx >> 31) & 1U) == 0)
printf("ecx valid\n");
if(((edx >> 31) & 1U) == 0)
printf("edx valid\n");
*/
}