xnf_btop
xnf_btop(pa_to_ma(dma_cookie->dmac_laddress));
xnf_btop((uintptr_t)mp->b_wptr - 1) - xnf_btop((uintptr_t)mp->b_rptr) + 1)
bdesc->buf_mfn = pfn_to_mfn(xnf_btop(bdesc->buf_phys));
bdesc->buf_mfn = pfn_to_mfn(xnf_btop(bdesc->buf_phys));
xnf_btop(pa_to_ma(xnfp->xnf_tx_ring_phys_addr)), 0);
xnf_btop(pa_to_ma(xnfp->xnf_rx_ring_phys_addr)), 0);