fillw_io
fillw_io(val, adp->va_window, l/sizeof(u_int16_t));
fillw_io(val, adp->va_window + offset,
fillw_io(val, adp->va_window, end/sizeof(u_int16_t));
fillw_io(attr | c, sc_vtb_pointer(vtb, 0), vtb->vtb_size);
fillw_io(attr | c, sc_vtb_pointer(vtb, at), count);
fillw_io(attr | c, sc_vtb_pointer(vtb, at + len),
fillw_io(attr | c, sc_vtb_pointer(vtb, at), count);