HelenOS sources

RCTL_MPE          761 uspace/drv/nic/e1k/e1k.c 	rctl = rctl & ~RCTL_MPE;
RCTL_MPE          773 uspace/drv/nic/e1k/e1k.c 	rctl = rctl | RCTL_MPE;
HelenOS homepage, sources at GitHub