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x86 Assembly: How to Retrieve the CPU Name with CPUID
An example of how to retrieve the CPU brand or name using the CPUID instruction.
This assembly code was compiled with MS Visual C++ Express Edition 2005 using the MACRO ASSEMBLER for MS Visual C++ Express Edition 2005.
TITLE 'extern "C" int __cdecl cpu_brand(char *brand);'
.686P
.model FLAT
PUBLIC _cpu_brand
_TEXT SEGMENT
_cpu_brand PROC NEAR
push ebx
mov eax, 80000000h
cpuid
cmp eax, 80000004h
jnge not_supported
mov esi, [esp+(1+1)*4]
mov eax, 80000002h
cpuid
mov [esi], eax
mov [esi+4], ebx
mov [esi+8], ecx
mov [esi+12], edx
mov eax, 80000003h
cpuid
mov [esi+16], eax
mov [esi+20], ebx
mov [esi+24], ecx
mov [esi+28], edx
mov eax, 80000004h
cpuid
mov [esi+32], eax
mov [esi+36], ebx
mov [esi+40], ecx
mov [esi+44], edx
mov eax, 1
jmp exit
not_supported:
xor eax, eax
exit:
pop ebx
ret 0
_cpu_brand ENDP
_TEXT ENDS
END
Example usage / driver code:
#include <iostream>
extern "C" int __cdecl cpu_brand(char *brand);
int main(int argc, char *argv[])
{
char brand[48+1];
brand[48] = 0;
if(cpu_brand(brand))
{
std::cout << brand << std::endl;
}
return 0;
}
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