HelenOS sources

CTRL_SPEED_SHIFT  422 uspace/drv/nic/e1k/e1k.c 		ctrl |= CTRL_SPEED_1000 << CTRL_SPEED_SHIFT;
CTRL_SPEED_SHIFT  424 uspace/drv/nic/e1k/e1k.c 		ctrl |= CTRL_SPEED_100 << CTRL_SPEED_SHIFT;
CTRL_SPEED_SHIFT  426 uspace/drv/nic/e1k/e1k.c 		ctrl |= CTRL_SPEED_10 << CTRL_SPEED_SHIFT;
CTRL_SPEED_SHIFT  169 uspace/drv/nic/e1k/e1k.h 	CTRL_SPEED_MASK = CTRL_SPEED_ALL << CTRL_SPEED_SHIFT,
HelenOS homepage, sources at GitHub