iopte_t
size = ((0 - IOMMU_DVMA_BASE) / sc->sc_pagesize) * sizeof(iopte_t);
sc->sc_ptes = (iopte_t *)va;
iopte_t *tpte_p;
pa = (u_int)pbase + (range/pagesz - 1)*sizeof(iopte_t);
tpte_p--, pa -= sizeof(iopte_t)) {
iopte_t *sc_ptes;