#include <stdio.h>

static inline int cpu_number(void) {
  long eax = 1, ebx = 0, ecx = 0, edx = 0;
  char apic_id = 0;
  int cpun = -1;

  asm("cpuid" : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (eax));

  apic_id = (char) (ebx >> 24) & 0xff;

  printf("eax = %lx, ebx = %lx, ecx = %lx, edx = %lx\n", eax, ebx, ecx, edx);
  printf("apic_id = %lx\n", apic_id);

  return cpun;
}

int main (void) {
  printf("%d\n", cpu_number());

  return 0;
}