sparc_bus_unmap
int (*sparc_bus_unmap)(bus_space_tag_t,
int sparc_bus_unmap(bus_space_tag_t, bus_space_tag_t, bus_space_handle_t,
.sparc_bus_unmap = sparc_bus_unmap,
_BS_PRECALL(t, sparc_bus_unmap);
ret = _BS_CALL(t, sparc_bus_unmap)(t, t0, h, s);