#cpuid.s Sample program to extract the processor Vendor ID
.section .data
output:
   .ascii "The processor Vendor ID is 'xxxxxxxxxxxx'\n"
.section .text
.globl _start
_start:
   movl $0, %eax
   cpuid
   movl $output, %edi
   movl %ebx, 28(%edi)
   movl %edx, 32(%edi)
   movl %ecx, 36(%edi)
   movl $4, %eax
   movl $1, %ebx
   movl $output, %ecx
   movl $42, %edx
   int $0x80
   movl $1, %eax
   movl $0, %ebx
   int $0x80

---------------------------------------------------------------------------------------------------------------------------
EAX    value       cpuid output
0                        Vendor ID string, and the maximum cpuid option value supported
1                        Processor type, family, model, and stepping information
2                        Processor cache configuration
3                        Processor serial number
4                        Cache configuration
5                        Monitor information
80000000h        Extended vendor ID string and supported levels
80000001h        Extended processor type, family, model, and stepping information
80000002h
-80000004h       Extended processor name string