diff --git a/common/hw-mmio_range.ads b/common/hw-mmio_range.ads
new file mode 100644
index 0000000..1b33630
--- /dev/null
+++ b/common/hw-mmio_range.ads
@@ -0,0 +1,35 @@
+--
+-- 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;
+
+generic
+   Base_Addr : Word64;
+   type Element_T is mod <>;
+   type Index_T is range <>;
+   type Array_T is array (Index_T) of Element_T;
+package HW.MMIO_Range
+with
+   Abstract_State =>
+     ((State with External),
+      Base_Address),
+   Initializes => Base_Address
+is
+
+   procedure Read (Value : out Element_T; Index : in Index_T);
+
+   procedure Write (Index : in Index_T; Value : in Element_T);
+
+   procedure Set_Base_Address (Base : Word64);
+
+end HW.MMIO_Range;