rbus_space_free
status = rbus_space_free(rbt->rb_parent, bsh, size, &addr);
int rbus_space_free(rbus_tag_t, bus_space_handle_t, bus_size_t,
int (*rbus_space_free)(struct rbustag *, bus_space_handle_t,
rbus_space_free(rb, ioh, size, NULL);
rbus_space_free(sc->sc_rbus_memt, pcmhp->memh, pcmhp->realsize, NULL);
return rbus_space_free(rb, bsh, size, NULL);
rbus_space_free(sc->sc_rbus_memt, bmh, 0x1000, NULL);