sgc_slottopa
pa = sgc_slottopa(slot);
paddr_t sgc_slottopa(int);
if (bus_space_map(iot, (bus_addr_t)sgc_slottopa(slot),
base = sgc_slottopa(slot);
base = sgc_slottopa(slot);
base = (bus_addr_t)sgc_slottopa(saa->saa_slot);