tte_hmenum
sfhme0 = sfhme - sfhme->hme_tte.tte_hmenum;
ttep->tte_hmenum = hmenum;
+ (TTEBYTES(TTE_CSZ(&tte)) * (tte).tte_hmenum)))
+ (TTEBYTES(TTE_CSZ(ttep)) * ((ttep)->tte_hmenum + 1))))