HelenOS sources

PCI_GET_DEVICES    71 uspace/drv/bus/pci/pciintel/ctl.c 		case PCI_GET_DEVICES:
PCI_GET_DEVICES   188 uspace/lib/device/src/pci.c 	return pci_get_ids_internal(pci, PCI_GET_DEVICES, 0, data, count);
HelenOS homepage, sources at GitHub