GTIMER_CNT_LOW
low = bus_space_read_4(iot, ioh, GTIMER_CNT_LOW);
bus_space_write_4(sc->sc_iot, ioh, GTIMER_CNT_LOW, 0);
return bus_space_read_4(sc->sc_iot, sc->sc_ioh, GTIMER_CNT_LOW);
oclock = bus_space_read_4(sc->sc_iot, sc->sc_ioh, GTIMER_CNT_LOW);
GTIMER_CNT_LOW);