dxs_desc
src_xd = &dxs->dxs_desc[DMAC_DESC_SRC];
dst_xd = &dxs->dxs_desc[DMAC_DESC_DST];
#define ds_src_addr_hold ds_xfer.dxs_desc[DMAC_DESC_SRC].xd_addr_hold
#define ds_dst_addr_hold ds_xfer.dxs_desc[DMAC_DESC_DST].xd_addr_hold
#define ds_src_burst ds_xfer.dxs_desc[DMAC_DESC_SRC].xd_burst_size
#define ds_dst_burst ds_xfer.dxs_desc[DMAC_DESC_DST].xd_burst_size
#define ds_src_dma_segs ds_xfer.dxs_desc[DMAC_DESC_SRC].xd_dma_segs
#define ds_dst_dma_segs ds_xfer.dxs_desc[DMAC_DESC_DST].xd_dma_segs
#define ds_src_nsegs ds_xfer.dxs_desc[DMAC_DESC_SRC].xd_nsegs
#define ds_dst_nsegs ds_xfer.dxs_desc[DMAC_DESC_DST].xd_nsegs
src = &dxs->dxs_desc[DMAC_DESC_SRC];
dst = &dxs->dxs_desc[DMAC_DESC_DST];