IFF_PHYINTINST_FLAGS
ASSERT((ill->ill_flags & ~(IFF_PHYINTINST_FLAGS)) == 0);
ill->ill_flags |= (turn_on & IFF_PHYINTINST_FLAGS);
ill->ill_flags &= (~turn_off & IFF_PHYINTINST_FLAGS);
ill->ill_flags |= (turn_on & IFF_PHYINTINST_FLAGS);
ill->ill_flags &= (~turn_off & IFF_PHYINTINST_FLAGS);
ASSERT((ill->ill_flags & ~(IFF_PHYINTINST_FLAGS)) == 0);