obio_handler
void obio_intr_mask(struct obio_softc *, struct obio_handler *);
void obio_intr_unmask(struct obio_softc *, struct obio_handler *);
int (* func)(void *) = ((struct obio_handler *)ih)->func;
obio_intr_mask(struct obio_softc *sc, struct obio_handler *ih)
obio_intr_unmask(struct obio_softc *sc, struct obio_handler *ih)