REG_OFFSET
#define DGRPH_SWAP_CNTL(d) REG_OFFSET(d, 0x610c)
#define DCRTC_BLANK_CONTROL(d) REG_OFFSET(d, 0x6084)
#define DCUR_CONTROL(d) REG_OFFSET(d, 0x6400)
#define DCUR_SURFACE_ADDRESS(d) REG_OFFSET(d, 0x6408)
#define DCUR_SIZE(d) REG_OFFSET(d, 0x6410)
#define DCUR_POSITION(d) REG_OFFSET(d, 0x6414)
#define DCUR_HOT_SPOT(d) REG_OFFSET(d, 0x6418)
#define DCUR_UPDATE(d) REG_OFFSET(d, 0x6424)
if (bus_space_map(sc->sc_iot, ga->ga_hpa, REG_SZ + REG_OFFSET,
sc->sc_ioh = sc->sc_op->sc_ioh + REG_OFFSET;