get_max_resource
bus_node = get_max_resource(&(resources->bus_head), 1);
io_node = get_max_resource(&(resources->io_head), 0x1000);
mem_node = get_max_resource(&(resources->mem_head), 0x100000);
p_mem_node = get_max_resource(&(resources->p_mem_head), 0x100000);