_riva_hw_inst
struct _riva_hw_inst;
int (*Busy)(struct _riva_hw_inst *);
void (*LoadStateExt)(struct _riva_hw_inst *,struct _riva_hw_state *);
void (*UnloadStateExt)(struct _riva_hw_inst *,struct _riva_hw_state *);
void (*SetStartAddress)(struct _riva_hw_inst *,U032);
void (*SetSurfaces2D)(struct _riva_hw_inst *,U032,U032);
void (*SetSurfaces3D)(struct _riva_hw_inst *,U032,U032);
int (*ShowHideCursor)(struct _riva_hw_inst *,int);
void (*LockUnlock)(struct _riva_hw_inst *, int);