readb
return ops->readb(handle, offset);
u_int8_t (*readb)(void *, u_int32_t);
return (readb(adev->rmmio + offset));
#define RREG8(reg) readb((rdev->rmmio) + (reg))
val1 = readb(&bios[0]);
val2 = readb(&bios[1]);