AGP_SIS_WINCTRL
reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);
reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);
gws = (pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL)&0x70) >> 4;
reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);