dma64dd
pdcs->txd_64 = (struct dma64dd *)pdcs->tx_ring_alloc.vbase;
pdcs->rxd_64 = (struct dma64dd *)pdcs->rx_ring_alloc.vbase;
struct dma64dd *txd_64; /* tx descriptor ring */
struct dma64dd *rxd_64; /* rx descriptor ring */
#define RING_ENTRY_SIZE sizeof(struct dma64dd)
struct dma64dd *rxd = &pdcs->rxd_64[pdcs->rxout];
struct dma64dd *txd = &pdcs->txd_64[pdcs->txout];