VR4181GIU_INTSTAT_REG_W
VR4181GIU_INTSTAT_REG_W, mask);
VR4181GIU_INTSTAT_REG_W, 1 << ih->ih_port);
r = bus_space_read_2(sc->sc_iot, sc->sc_ioh, VR4181GIU_INTSTAT_REG_W);
bus_space_write_2(sc->sc_iot, sc->sc_ioh, VR4181GIU_INTSTAT_REG_W, r);