gistfile1.txt

static __inline void do_cpuid(u_int ax, u_int *p) {
  __asm __volatile("pushl %%ebx\n\t"
                   "cpuid\n\t"
                   "movl %%ebx, %%esi\n\t"
                   "popl %%ebx\n\t"
                   : "=a" (p[0]), "=r" (p[1]), "=c" (p[2]), "=d" (p[3])
                   : "a" (ax));
}