INT1_LOCAL_MASK
bus_space_write_1(iot, ioh, INT1_LOCAL_MASK, 0);
mask = bus_space_read_1(iot, ioh, INT1_LOCAL_MASK);
mask = bus_space_read_1(iot, ioh, INT1_LOCAL_MASK);
bus_space_write_1(iot, ioh, INT1_LOCAL_MASK, mask);