diff --git a/common/hw-gfx-framebuffer_filler.ads b/common/hw-gfx-framebuffer_filler.ads
new file mode 100644
index 0000000..b728a39
--- /dev/null
+++ b/common/hw-gfx-framebuffer_filler.ads
@@ -0,0 +1,28 @@
+--
+-- 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; version 2 of the License.
+--
+-- 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.
+--
+
+with System;
+
+with HW;
+
+use type HW.Int32;
+
+package HW.GFX.Framebuffer_Filler
+is
+
+   procedure Fill (Linear_FB : Word64; Framebuffer : Framebuffer_Type)
+   with
+      Pre =>
+         Framebuffer.Width <= Framebuffer.Stride;
+
+end HW.GFX.Framebuffer_Filler;