IST_EDGE_RAISE
!(type == IST_EDGE_RAISE || type == IST_EDGE_FALL))
if (type == IST_EDGE_RAISE)
sc->intr+1, IST_EDGE_RAISE, IPL_TTY, sackbc_rxint, sc);
IST_EDGE_RAISE, IPL_BIO, sapcic_intr, so);