AR_IMR_S2
mask2 = AR_READ(sc, AR_IMR_S2);
AR_WRITE(sc, AR_IMR_S2, mask2);
AR_CLRBITS(sc, AR_IMR_S2, AR_IMR_S2_TIM | AR_IMR_S2_DTIM |
AR_SETBITS(sc, AR_IMR_S2, AR_IMR_S2_GTT);