RCTRL_VLEX
~(RCTRL_IPCSEN | RCTRL_TUCSEN | RCTRL_VLEX | RCTRL_PRSDEP);
sc->sc_rctrl |= RCTRL_VLEX;
& (RCTRL_IPCSEN | RCTRL_TUCSEN | RCTRL_VLEX | RCTRL_PRSDEP))
__SHIFTOUT(sc->sc_rctrl, RCTRL_VLEX),