diff --git a/common/hw-gfx-gma-display_probing.ads b/common/hw-gfx-gma-display_probing.ads
new file mode 100644
index 0000000..3d1e914
--- /dev/null
+++ b/common/hw-gfx-gma-display_probing.ads
@@ -0,0 +1,26 @@
+--
+-- Copyright (C) 2015-2016 secunet Security Networks AG
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; either version 2 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+
+package HW.GFX.GMA.Display_Probing
+is
+
+   type Port_List_Range is range 0 .. 7;
+   type Port_List is array (Port_List_Range) of Port_Type;
+
+   procedure Scan_Ports
+     (Configs  :    out Pipe_Configs;
+      Ports    : in     Port_List;
+      Max_Pipe : in     Pipe_Index := Pipe_Index'Last);
+
+end HW.GFX.GMA.Display_Probing;