acpi_pci_md_decompose_tag
static void acpi_pci_md_decompose_tag(void *, pcitag_t, int *, int *, int *);
.pc_decompose_tag = acpi_pci_md_decompose_tag,
acpi_pci_md_decompose_tag(NULL, *pba->pba_bridgetag, &bus, &dev, &func);