fwdma_malloc
fwdma_malloc(dev, dmat, &dma->dma_map, size, alignment, flags);
seg->v_addr = fwdma_malloc(fc->dev, am->dma_tag, &seg->dma_map,
void *fwdma_malloc(device_t, bus_dma_tag_t, bus_dmamap_t *, bus_size_t, int,
db_tr->buf = fwdma_malloc(fc->dev, fc->dmat,