GEMINI_TIMER_INTRMASK
r = bus_space_read_4(sc->sc_iot, sc->sc_ioh, GEMINI_TIMER_INTRMASK);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, GEMINI_TIMER_INTRMASK, r);
r = bus_space_read_4(sc->sc_iot, sc->sc_ioh, GEMINI_TIMER_INTRMASK);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, GEMINI_TIMER_INTRMASK, r);
? (GEMINI_TIMER_INTRMASK + 4)
GEMINI_TIMER_INTRMASK, (uint32_t)~TIMER_INTRMASK_Resv);