vr_dmamem_alloc
int vr_dmamem_alloc(struct vr_softc *, struct vr_dmamem *,
if (vr_dmamem_alloc(sc, &sc->sc_zeromap, 64, PAGE_SIZE) != 0) {
if (vr_dmamem_alloc(sc, &sc->sc_listmap, sizeof(struct vr_list_data),