HelenOS sources

PCI_COMMAND       921 uspace/drv/bus/pci/pciintel/pci.c 	fun->command = pci_conf_read_16(fun, PCI_COMMAND) |
PCI_COMMAND       923 uspace/drv/bus/pci/pciintel/pci.c 	pci_conf_write_16(fun, PCI_COMMAND, fun->command);
HelenOS homepage, sources at GitHub