siop_sgc_r1
reg = siop_sgc_r1(v, h, SIOP_SIST0);
reg |= siop_sgc_r1(v, h, SIOP_SIST1) << 8;
u_int8_t siop_sgc_r1(void *, bus_space_handle_t, bus_size_t);
sc->sc_bustag.hbt_r1 = siop_sgc_r1;