HelenOS sources

ANAR_10_FD       1657 uspace/drv/nic/rtl8139/driver.c 		anar |= ANAR_10_FD;
ANAR_10_FD       1713 uspace/drv/nic/rtl8139/driver.c 	if (anar & ANAR_10_FD)
ANAR_10_FD        639 uspace/drv/nic/rtl8169/driver.c 		anar |= ANAR_10_FD;
HelenOS homepage, sources at GitHub