wiifb_mapreg
sc->sc_efb = wiifb_mapreg(sc, EFB_BASE, EFB_SIZE);
sc->sc_cp = wiifb_mapreg(sc, CP_BASE, CP_SIZE);
sc->sc_pe = wiifb_mapreg(sc, PE_BASE, PE_SIZE);
sc->sc_pi = wiifb_mapreg(sc, PI_BASE, PI_SIZE);
sc->sc_wgpipe = wiifb_mapreg(sc, WGPIPE_BASE, WGPIPE_SIZE);