pci_ign_t
pci_ign_t cb_ign; /* 1st-attached-side interrupt grp# */
pci_ign_t ib_ign; /* interrupt group # */
#define PCI_ID_TO_IGN(pci_id) ((pci_ign_t)UPAID_TO_IGN(pci_id))
#define PCI_ID_TO_IGN(pci_id) ((pci_ign_t)((pci_id) & 0x1f))