diff --git a/ada/dynamic_mmio/hw-mmio_range.adb b/ada/dynamic_mmio/hw-mmio_range.adb
new file mode 100644
index 0000000..78cc048
--- /dev/null
+++ b/ada/dynamic_mmio/hw-mmio_range.adb
@@ -0,0 +1,76 @@
+--
+-- 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 HW.Debug;
+with GNAT.Source_Info;
+with System.Storage_Elements;
+with System.Address_To_Access_Conversions;
+
+package body HW.MMIO_Range
+with
+   Refined_State =>
+     (State => Range_A,       -- the contents accessed
+      Base_Address => null)   -- the address, so actually Range_A too
+is
+   pragma Warnings (Off, "implicit dereference",
+                    Reason => "This is what this package is about.");
+
+   Debug_Reads    : constant Boolean := False;
+   Debug_Writes   : constant Boolean := False;
+
+   type Range_Access is access all Array_T;
+   package Conv_Range is new System.Address_To_Access_Conversions (Array_T);
+
+   Range_A : Range_Access :=
+      Range_Access (Conv_Range.To_Pointer (System'To_Address (Base_Addr)))
+   with Volatile;
+
+   procedure Read (Value : out Element_T; Index : in Index_T)
+   is
+      use type Word32;
+   begin
+      Value := Range_A (Index);
+      pragma Debug (Debug_Reads, Debug.Put
+        (GNAT.Source_Info.Enclosing_Entity & ":  "));
+      pragma Debug (Debug_Reads, Debug.Put_Word32 (Word32 (Value)));
+      pragma Debug (Debug_Reads, Debug.Put (" <- "));
+      pragma Debug (Debug_Reads, Debug.Put_Word32
+        (Word32 (System.Storage_Elements.To_Integer
+           (Conv_Range.To_Address (Conv_Range.Object_Pointer (Range_A)))) +
+         Word32 (Index) * (Element_T'Size / 8)));
+      pragma Debug (Debug_Reads, Debug.New_Line);
+   end Read;
+
+   procedure Write (Index : in Index_T; Value : in Element_T)
+   is
+      use type Word32;
+   begin
+      pragma Debug (Debug_Writes, Debug.Put
+        (GNAT.Source_Info.Enclosing_Entity & ": "));
+      pragma Debug (Debug_Writes, Debug.Put_Word32 (Word32 (Value)));
+      pragma Debug (Debug_Writes, Debug.Put (" -> "));
+      pragma Debug (Debug_Writes, Debug.Put_Word32
+        (Word32 (System.Storage_Elements.To_Integer
+           (Conv_Range.To_Address (Conv_Range.Object_Pointer (Range_A)))) +
+         Word32 (Index) * (Element_T'Size / 8)));
+      pragma Debug (Debug_Writes, Debug.New_Line);
+      Range_A (Index) := Value;
+   end Write;
+
+   procedure Set_Base_Address (Base : Word64) is
+   begin
+      Range_A := Range_Access
+        (Conv_Range.To_Pointer (System'To_Address (Base)));
+   end Set_Base_Address;
+
+end HW.MMIO_Range;