AGP_SIS_WINCTRL
pci_write_config(dev, AGP_SIS_WINCTRL,
pci_read_config(dev, AGP_SIS_WINCTRL, 1) | 3, 1);
pci_write_config(dev, AGP_SIS_WINCTRL,
pci_read_config(dev, AGP_SIS_WINCTRL, 1) & ~3, 1);
gws = (pci_read_config(dev, AGP_SIS_WINCTRL, 1) & 0x70) >> 4;
pci_write_config(dev, AGP_SIS_WINCTRL,
((pci_read_config(dev, AGP_SIS_WINCTRL, 1) & ~0x70)