TT_SHIFTER_STHIGH
if (mode == TT_SHIFTER_TTHIGH || mode == TT_SHIFTER_STHIGH) {
par->hw.tt.mode = TT_SHIFTER_STHIGH;
case TT_SHIFTER_STHIGH:
if ((shifter_tt.tt_shiftmode & TT_SHIFTER_MODEMASK) == TT_SHIFTER_STHIGH)
TT_SHIFTER_STHIGH && regno == 254)