Index: abi/include/abi/ipc/interfaces.h
===================================================================
--- abi/include/abi/ipc/interfaces.h	(revision 3fcea3438e30a096e9a5590a54508cfe3d5a697f)
+++ abi/include/abi/ipc/interfaces.h	(revision 0d00e53ee0e707747c5d846467b5eddfa7a0e101)
@@ -202,5 +202,9 @@
 	    FOURCC_COMPACT('w', 'm', 'g', 't') | IFACE_EXCHANGE_SERIALIZE | IFACE_MOD_CALLBACK,
 	INTERFACE_TBARCFG_NOTIFY =
-	    FOURCC_COMPACT('t', 'b', 'c', 'f') | IFACE_EXCHANGE_SERIALIZE
+	    FOURCC_COMPACT('t', 'b', 'c', 'f') | IFACE_EXCHANGE_SERIALIZE,
+	INTERFACE_SYSTEM =
+	    FOURCC_COMPACT('s', 's', 't', 'm') | IFACE_EXCHANGE_SERIALIZE,
+	INTERFACE_SYSTEM_CB =
+	    FOURCC_COMPACT('s', 's', 't', 'm') | IFACE_EXCHANGE_SERIALIZE | IFACE_MOD_CALLBACK
 } iface_t;