mirror of
https://github.com/Dr-Noob/cpufetch.git
synced 2026-03-25 07:50:40 +01:00
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx)
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{
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/* ecx is often an input as well as an output. */
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asm volatile("cpuid"
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: "=a" (*eax),
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"=b" (*ebx),
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"=c" (*ecx),
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"=d" (*edx)
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: "0" (*eax), "2" (*ecx));
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}
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#include <stdio.h>
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int main(int argc, char **argv)
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{
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unsigned mask1 = 0xFF;
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unsigned mask2 = 0xFF00;
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unsigned mask3 = 0xFF0000;
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unsigned mask4 = 0xFF000000;
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unsigned eax, ebx, ecx, edx;
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eax = 2; /* processor info and feature bits */
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native_cpuid(&eax, &ebx, &ecx, &edx);
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/*
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printf("AL = 0x%x\n",eax & 0xFF);
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printf("0x%x(0x%x)\n",eax, (1 << 31) & eax);
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printf("0x%x(0x%x)\n",ebx, (1 << 31) & ebx);
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printf("0x%x(0x%x)\n",ecx, (1 << 31) & ecx);
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printf("0x%x(0x%x)\n",edx, (1 << 31) & edx);
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*/
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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);
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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);
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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);
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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);
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/*
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if(((eax >> 31) & 1U) == 0)
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printf("eax valid\n");
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if(((ebx >> 31) & 1U) == 0)
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printf("ebx valid\n");
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if(((ecx >> 31) & 1U) == 0)
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printf("ecx valid\n");
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if(((edx >> 31) & 1U) == 0)
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printf("edx valid\n");
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*/
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}
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