static unsigned int cpuid_getreg(unsigned int f, int reg)
{
    __asm__ (
        "movl %0, %%eax" : : \
        "r" (f) : "%eax" );
    __asm__ (
        "cpuid"
    );

    switch(reg)
    {
        case MCR_EAX: { register unsigned int t __asm__("%eax"); return t; }
        case MCR_EBX: { register unsigned int t __asm__("%ebx"); return t; }
        case MCR_ECX: { register unsigned int t __asm__("%ecx"); return t; }
        case MCR_EDX: { register unsigned int t __asm__("%edx"); return t; }
        default:
            return 0;
    }
    return 0;
}