NEP_DMA_DVA
val = NEP_DMA_DVA(sc->sc_rxmbox) >> 32;
val = NEP_DMA_DVA(sc->sc_rxmbox) & 0xffffffc0;
val = NEP_DMA_DVA(sc->sc_rbring);
val = NEP_DMA_DVA(sc->sc_rcring);
val = NEP_DMA_DVA(sc->sc_txring);