CFG_ADDR_DEV
*devp = __SHIFTOUT(tag, CFG_ADDR_DEV);
| __SHIFTIN(dev, CFG_ADDR_DEV)
if ((tag & (CFG_ADDR_BUS|CFG_ADDR_DEV)) == 0) {
if ((tag & (CFG_ADDR_BUS|CFG_ADDR_DEV|CFG_ADDR_FUNC)) == 0