pci_memlist_subsume
extern void pci_memlist_subsume(struct memlist **, struct memlist **);
pci_memlist_subsume(&pci_bus_res[secbus].io_used,
pci_memlist_subsume(&pci_bus_res[secbus].mem_used,
pci_memlist_subsume(&pci_bus_res[secbus].pmem_used,
pci_memlist_subsume(used, avail);