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diff --git a/src/mem/ruby/structures/PersistentTable.hh b/src/mem/ruby/structures/PersistentTable.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.
+ */
+
+#ifndef __MEM_RUBY_SYSTEM_PERSISTENTTABLE_HH__
+#define __MEM_RUBY_SYSTEM_PERSISTENTTABLE_HH__
+
+#include <iostream>
+
+#include "base/hashmap.hh"
+#include "mem/protocol/AccessType.hh"
+#include "mem/ruby/common/Address.hh"
+#include "mem/ruby/common/MachineID.hh"
+#include "mem/ruby/common/NetDest.hh"
+
+class PersistentTableEntry
+{
+  public:
+    PersistentTableEntry() {}
+    void print(std::ostream& out) const {}
+
+    NetDest m_starving;
+    NetDest m_marked;
+    NetDest m_request_to_write;
+};
+
+class PersistentTable
+{
+  public:
+    // Constructors
+    PersistentTable();
+
+    // Destructor
+    ~PersistentTable();
+
+    // Public Methods
+    void persistentRequestLock(const Address& address, MachineID locker,
+                               AccessType type);
+    void persistentRequestUnlock(const Address& address, MachineID unlocker);
+    bool okToIssueStarving(const Address& address, MachineID machID) const;
+    MachineID findSmallest(const Address& address) const;
+    AccessType typeOfSmallest(const Address& address) const;
+    void markEntries(const Address& address);
+    bool isLocked(const Address& addr) const;
+    int countStarvingForAddress(const Address& addr) const;
+    int countReadStarvingForAddress(const Address& addr) const;
+
+    void print(std::ostream& out) const;
+
+  private:
+    // Private copy constructor and assignment operator
+    PersistentTable(const PersistentTable& obj);
+    PersistentTable& operator=(const PersistentTable& obj);
+
+    // Data Members (m_prefix)
+    typedef m5::hash_map<Address, PersistentTableEntry> AddressMap;
+    AddressMap m_map;
+};
+
+inline std::ostream&
+operator<<(std::ostream& out, const PersistentTable& obj)
+{
+    obj.print(out);
+    out << std::flush;
+    return out;
+}
+
+inline std::ostream&
+operator<<(std::ostream& out, const PersistentTableEntry& obj)
+{
+    obj.print(out);
+    out << std::flush;
+    return out;
+}
+
+#endif // __MEM_RUBY_SYSTEM_PERSISTENTTABLE_HH__