AGP_NVIDIA_0_APSIZE
temp = pci_conf_read(sc->as_pc, sc->as_tag, AGP_NVIDIA_0_APSIZE);
pci_conf_write(sc->as_pc, sc->as_tag, AGP_NVIDIA_0_APSIZE, temp | 0x100);
apsize = pci_conf_read(sc->as_pc, sc->as_tag, AGP_NVIDIA_0_APSIZE)
reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_NVIDIA_0_APSIZE);
pci_conf_write(sc->as_pc, sc->as_tag, AGP_NVIDIA_0_APSIZE, reg);
temp = pci_conf_read(sc->as_pc, sc->as_tag, AGP_NVIDIA_0_APSIZE);
pci_conf_write(sc->as_pc, sc->as_tag, AGP_NVIDIA_0_APSIZE, temp & ~(0x100));