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diff --git a/src/mem/ruby/tester/RaceyPseudoThread.hh b/src/mem/ruby/tester/RaceyPseudoThread.hh
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+/*
+ * Copyright (c) 1999 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.
+ */
+
+/*
+ * Description: This implements a pseudo racey thread which drives ruby timing
+ *              simulator with access to two shared arrays.
+ *
+ */
+
+#ifndef RACEYPSEUDOTHREAD_H
+#define RACEYPSEUDOTHREAD_H
+
+#include "mem/ruby/tester/Global_Tester.hh"
+#include "mem/ruby/common/Consumer.hh"
+#include "mem/ruby/system/NodeID.hh"
+#include "Address_Tester.hh"
+#include "mem/ruby/libruby.hh"
+
+class RaceyDriver;
+
+class RaceyPseudoThread : public Consumer {
+private:
+  // constants
+  static const int PRIME1     = 103072243;
+  static const int PRIME2     = 103995407;
+  static const int M_ELEM     = 64;
+
+  // m and sig array's starting address,
+  // each signature should occupy a cacheline
+  static const int SIG_ARR    = 0;
+  static const int M_ARR      = 0x10000;
+  static const int LINESIZE   = 64;
+
+  // get address of a element from the m and sig arrays
+  physical_address_t sig(unsigned index) {
+    assert(index < M_ARR/64);
+    return SIG_ARR + (index*64);
+  };
+  physical_address_t m(unsigned index) { return M_ARR + (index*64); };
+
+public:
+  // Constructors
+  RaceyPseudoThread(NodeID node, RaceyDriver& driver);
+
+  // Destructor
+  ~RaceyPseudoThread();
+
+  // Public Methods
+  void performCallback(int proc, Address address, uint8_t * data);
+
+  void wakeup();
+
+  integer_t getInstructionCount() { return m_ic_counter; };
+
+  unsigned getSignature() { assert(m_proc_id == 0); return m_final_sig; };
+
+  void checkForDeadlock();
+
+  // save and restore the thread state
+  void saveCPUStates(string filename);
+  void loadCPUStates(string filename);
+
+  // reset IC to zero for next checkpoint
+  void resetIC() { m_ic_counter = 0; };
+
+  bool getInitializedState() { return m_initialized; };
+
+  void print(ostream& out) const;
+private:
+  // Private Methods
+
+  // mix two numbers
+  unsigned mix (unsigned i, unsigned j) { return (i + j * PRIME2) % PRIME1; };
+
+  // load or store the array
+  void load_sig(unsigned index);
+  void load_m(unsigned index);
+  void store_sig(unsigned index, unsigned value);
+  void store_m(unsigned index, unsigned value);
+
+  // Private copy constructor and assignment operator
+  RaceyPseudoThread(const RaceyPseudoThread& obj);
+  RaceyPseudoThread& operator=(const RaceyPseudoThread& obj);
+
+  // Data Members (m_ prefix)
+  RaceyDriver& m_driver;
+  NodeID m_proc_id;
+
+  // are we done?
+  bool m_done;
+
+  // [committed] instruction counter
+  int m_ic_counter;
+
+  // last time we made progress
+  Time m_last_progress;
+
+  // value of the callback block
+  bool     m_read;
+  unsigned m_value;
+
+  // final signature
+  unsigned m_final_sig;
+
+  // local variables for the pseudo thread
+  int m_looper;
+  unsigned m_num, m_index1, m_index2, m_stop;
+  bool m_initialized;
+};
+
+// Output operator declaration
+ostream& operator<<(ostream& out, const RaceyPseudoThread& obj);
+
+// ******************* Definitions *******************
+
+// Output operator definition
+extern inline
+ostream& operator<<(ostream& out, const RaceyPseudoThread& obj)
+{
+  obj.print(out);
+  out << flush;
+  return out;
+}
+
+#endif //RACEYPSEUDOTHREAD_H
+