AGP_ALI_ATTBASE
attbase = pci_read_config(dev, AGP_ALI_ATTBASE, 4);
pci_write_config(dev, AGP_ALI_ATTBASE, gatt->ag_physical |
attbase = pci_read_config(dev, AGP_ALI_ATTBASE, 4);
pci_write_config(dev, AGP_ALI_ATTBASE, attbase & 0xfff, 4);
int i = pci_read_config(dev, AGP_ALI_ATTBASE, 4) & 0xf;
attbase = pci_read_config(dev, AGP_ALI_ATTBASE, 4);
pci_write_config(dev, AGP_ALI_ATTBASE, (attbase & ~0xf) | i, 4);