diff --git a/include/dma.h b/include/dma.h
index 29d94c0..5fdcb17 100644
--- a/include/dma.h
+++ b/include/dma.h
@@ -30,6 +30,18 @@
 }
 #endif
 
+dma_addr_t dma_map_single(struct device_d *dev, void *ptr, size_t size,
+			  enum dma_data_direction dir);
+void dma_unmap_single(struct device_d *dev, dma_addr_t addr, size_t size,
+		      enum dma_data_direction dir);
+
+#define DMA_ERROR_CODE  (~(dma_addr_t)0)
+
+static inline int dma_mapping_error(struct device_d *dev, dma_addr_t dma_addr)
+{
+	return dma_addr == DMA_ERROR_CODE;
+}
+
 /* streaming DMA - implement the below calls to support HAS_DMA */
 void dma_sync_single_for_cpu(dma_addr_t address, size_t size,
 			     enum dma_data_direction dir);