get cpuid 序列号

#include <stdio.h>

int main(void)
{
        unsigned int eax = 0, edx = 0, ecx = 0;

        asm volatile ("cpuid"
                      : "=a"(eax), "=d"(edx)
                      : "a"(0x01)
                      );

        if (edx & (1 << 17))
        {
                /* edx输出中间32位的序列号，ecx输出最低32位的序列号 */
                asm volatile ("cpuid"
                              : "=c"(ecx), "=d"(edx)
                              : "a"(0x03)
                              );

                printf("Serial Number : %04x-%04x-%04x-%04x-%04x-%04x\n",
                        eax >> 16, eax << 16,
                        edx >> 16, edx << 16,
                        ecx >> 16, ecx << 16);

        }
        else
        {
                printf("no support cpu serial number.\n");
        }

        return 0;
}