AGPNISTAT
pci_read_config_dword(td, bridge->capndx+AGPNISTAT, &tnistat);
pci_read_config_dword(dev, cur->capndx+AGPNISTAT, &mnistat);
pci_read_config_dword(td, bridge->capndx+AGPNISTAT, &tnistat);
pci_read_config_dword(dev, cur->capndx+AGPNISTAT, &nistat);