pci_prd_find_resource
extern struct memlist *pci_prd_find_resource(uint32_t, pci_prd_rsrc_t);
pci_bus_res[bus].pmem_avail = pci_prd_find_resource(bus,
pci_bus_res[bus].mem_avail = pci_prd_find_resource(bus, PCI_PRD_R_MMIO);
pci_bus_res[bus].io_avail = pci_prd_find_resource(bus, PCI_PRD_R_IO);
pci_bus_res[bus].bus_avail = pci_prd_find_resource(bus, PCI_PRD_R_BUS);