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diff --git a/src/dev/sparc/mm_disk.hh b/src/dev/sparc/mm_disk.hh
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+/*
+ * Copyright (c) 2006 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Ali Saidi
+ */
+
+/** @file
+ * This device acts as a disk similar to the memory mapped disk device
+ * in legion. Any access is translated to an offset in the disk image.
+ */
+
+#ifndef __DEV_SPARC_MM_DISK_HH__
+#define __DEV_SPARC_MM_DISK_HH__
+
+#include "base/range.hh"
+#include "dev/io_device.hh"
+#include "dev/disk_image.hh"
+
+class MmDisk : public BasicPioDevice
+{
+  private:
+    DiskImage *image;
+    off_t curSector;
+    bool dirty;
+    union {
+        uint8_t bytes[SectorSize];
+        uint32_t words[SectorSize/4];
+    };
+
+  public:
+    struct Params : public BasicPioDevice::Params
+    {
+        DiskImage *image;
+    };
+  protected:
+    const Params *params() const { return (const Params*)_params; }
+
+  public:
+    MmDisk(Params *p);
+
+    virtual Tick read(PacketPtr pkt);
+    virtual Tick write(PacketPtr pkt);
+};
+
+#endif //__DEV_SPARC_MM_DISK_HH__
+