NR_DMA_TX
if (dma_wr != dma_rd && ((dma_rd+NR_DMA_TX-dma_wr) & (NR_DMA_TX-1)) <
dma_wr = (dma_wr+1) & (NR_DMA_TX-1);
eni_dev->service = eni_dev->tx_dma+NR_DMA_TX*8;
#define MID_SERVICE_BASE (MID_DMA_TX_BASE+NR_DMA_TX*8)