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diff --git a/src/mem/ruby/system/PersistentArbiter.hh b/src/mem/ruby/system/PersistentArbiter.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.
+ */
+
+/*
+ * PersistentArbiter.h
+ *
+ * Description:
+ *
+ * Used for hierarchical distributed persistent request scheme
+ *
+ */
+
+#ifndef PERSISTENTARBITER_H
+#define PERSISTENTARBITER_H
+
+#include "Global.hh"
+#include "Vector.hh"
+#include "AbstractChip.hh"
+#include "AccessPermission.hh"
+#include "AccessType.hh"
+#include "RubyConfig.hh"
+#include "Address.hh"
+#include "interface.hh"
+
+struct ArbiterEntry {
+  bool valid;
+  Address address;
+  AccessType type;
+  NodeID localId;
+};
+
+class PersistentArbiter {
+public:
+
+  // Constructors
+  PersistentArbiter(AbstractChip* chip_ptr);
+
+  // Destructor
+  ~PersistentArbiter();
+
+  // Public Methods
+
+  void addLocker(NodeID id, Address addr, AccessType type);
+  void removeLocker(NodeID id);
+  bool successorRequestPresent(Address addr, NodeID id);
+  bool lockersExist();
+  void advanceActiveLock();
+  Address getActiveLockAddress();
+  NodeID getArbiterId();
+  bool isBusy();
+
+  void setIssuedAddress(Address addr);
+  bool isIssuedAddress(Address addr);
+
+
+  Address getIssuedAddress() { return m_issued_address; }
+
+  static void printConfig(ostream& out) {}
+  void print(ostream& out) const;
+
+  NodeID getActiveLocalId();
+
+private:
+
+  Address m_issued_address;
+  AbstractChip* m_chip_ptr;
+  int m_locker;
+  bool m_busy;
+  Vector<ArbiterEntry> m_entries;
+};
+
+// Output operator definition
+extern inline
+ostream& operator<<(ostream& out, const PersistentArbiter& obj)
+{
+  obj.print(out);
+  out << flush;
+  return out;
+}
+
+
+#endif //PERFECTCACHEMEMORY_H