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diff --git a/src/mem/ruby/common/SubBlock.hh b/src/mem/ruby/common/SubBlock.hh
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+++ b/src/mem/ruby/common/SubBlock.hh
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+
+/*
+ * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
+ * 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.
+ */
+
+/*
+ * $Id$
+ *
+ */
+
+#ifndef SubBlock_H
+#define SubBlock_H
+
+#include "mem/ruby/common/Global.hh"
+#include "mem/ruby/common/Address.hh"
+#include "mem/ruby/config/RubyConfig.hh"
+#include "mem/ruby/common/DataBlock.hh"
+#include "mem/gems_common/Vector.hh"
+
+class SubBlock {
+public:
+  // Constructors
+  SubBlock() { }
+  SubBlock(const Address& addr, int size);
+  SubBlock(const Address& addr, const Address& logicalAddress, int size);
+
+  // Destructor
+  ~SubBlock() { }
+
+  // Public Methods
+  const Address& getAddress() const { return m_address; }
+  const Address& getLogicalAddress() const { return m_logicalAddress; }
+  void setAddress(const Address& addr) { m_address = addr; }
+  void setLogicalAddress(const Address& addr) { m_logicalAddress = addr; }
+
+  int getSize() const { return m_data.size(); }
+  void setSize(int size) {  m_data.setSize(size); }
+  uint8 getByte(int offset) const { return m_data[offset]; }
+  void setByte(int offset, uint8 data) { m_data[offset] = data; }
+
+  // Shorthands
+  uint8 readByte() const { return getByte(0); }
+  void writeByte(uint8 data) { setByte(0, data); }
+
+  // Merging to and from DataBlocks - We only need to worry about
+  // updates when we are using DataBlocks
+  void mergeTo(DataBlock& data) const { if (DATA_BLOCK) { internalMergeTo(data); } }
+  void mergeFrom(const DataBlock& data) { if (DATA_BLOCK) { internalMergeFrom(data); } }
+
+  void print(ostream& out) const;
+private:
+  // Private Methods
+  //  SubBlock(const SubBlock& obj);
+  //  SubBlock& operator=(const SubBlock& obj);
+  //  bool bytePresent(const Address& addr) { return ((addr.getAddress() >= m_address.getAddress()) && (addr.getAddress() < (m_address.getAddress()+getSize()))); }
+  //  uint8 getByte(const Address& addr) { return m_data[addr.getAddress() - m_address.getAddress()]; }
+
+  void internalMergeTo(DataBlock& data) const;
+  void internalMergeFrom(const DataBlock& data);
+
+  // Data Members (m_ prefix)
+  Address m_address;
+  Address m_logicalAddress;
+  Vector<uint> m_data;
+};
+
+// Output operator declaration
+ostream& operator<<(ostream& out, const SubBlock& obj);
+
+// ******************* Definitions *******************
+
+// Output operator definition
+extern inline
+ostream& operator<<(ostream& out, const SubBlock& obj)
+{
+  obj.print(out);
+  out << flush;
+  return out;
+}
+
+#endif //SubBlock_H