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cassemblycpuid

How to recognize cpu brand name in c/assembler by cpuid instruction

I have no idea how should this program work, i found some codes but i don't understand them, if somebody here was so kind and had program like this could you explain it to me?

#include <stdio.h>

#include <string.h>
int main()
{
char name[13];
 __asm
{
XOR EAX,EAX
CPUID
MOV dword ptr [name], EBX
MOV dword ptr [name+4], EDX
MOV dword ptr [name+8], ECX
 }
name[12]=0;
printf("Procesor: %s\n", name);
getchar();
return 0;
}
Solution

  • The cpuid instruction tells you various things about the CPU depending on the content of the eax register. When eax contains zero, the registers ebx, edx, and ecx contain a string describing the processor's vendor. The code you have pulls the string from the registers and prints it out.

    Read Wikipedia for further details on cpuid.