Index: kernel/generic/src/ddi/ddi.c
===================================================================
--- kernel/generic/src/ddi/ddi.c	(revision 5a5269df4bb8693ab8e38af0622b7fa6365b9535)
+++ kernel/generic/src/ddi/ddi.c	(revision 26853ebcc36f8ada7a3516d36987217d14f1a3c3)
@@ -107,4 +107,15 @@
 }
 
+/** Norify physical area has been unmapped.
+ *
+ * @param parea Physical area
+ */
+void ddi_parea_unmap_notify(parea_t *parea)
+{
+	parea->mapped = false;
+	if (parea->mapped_changed != NULL)
+		parea->mapped_changed(parea->arg);
+}
+
 /** Map piece of physical memory into virtual address space of current task.
  *
@@ -204,4 +215,6 @@
 
 map:
+	backend_data.parea = parea;
+
 	if (!as_area_create(TASK->as, flags, FRAMES2SIZE(pages),
 	    AS_AREA_ATTR_NONE, &phys_backend, &backend_data, virt, bound)) {