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diff --git a/src/mem/ruby/system/PerfectCacheMemory.hh b/src/mem/ruby/system/PerfectCacheMemory.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.
+ */
+
+/*
+ * PerfectCacheMemory.h
+ *
+ * Description:
+ *
+ * $Id$
+ *
+ */
+
+#ifndef PERFECTCACHEMEMORY_H
+#define PERFECTCACHEMEMORY_H
+
+#include "Global.hh"
+#include "Map.hh"
+#include "AccessPermission.hh"
+#include "RubyConfig.hh"
+#include "Address.hh"
+#include "interface.hh"
+#include "AbstractChip.hh"
+
+template<class ENTRY>
+class PerfectCacheLineState {
+public:
+  PerfectCacheLineState() { m_permission = AccessPermission_NUM; }
+  AccessPermission m_permission;
+  ENTRY m_entry;
+};
+
+template<class ENTRY>
+class PerfectCacheMemory {
+public:
+
+  // Constructors
+  PerfectCacheMemory(AbstractChip* chip_ptr);
+
+  // Destructor
+  //~PerfectCacheMemory();
+
+  // Public Methods
+
+  static void printConfig(ostream& out);
+
+  // perform a cache access and see if we hit or not.  Return true on
+  // a hit.
+  bool tryCacheAccess(const CacheMsg& msg, bool& block_stc, ENTRY*& entry);
+
+  // tests to see if an address is present in the cache
+  bool isTagPresent(const Address& address) const;
+
+  // Returns true if there is:
+  //   a) a tag match on this address or there is
+  //   b) an Invalid line in the same cache "way"
+  bool cacheAvail(const Address& address) const;
+
+  // find an Invalid entry and sets the tag appropriate for the address
+  void allocate(const Address& address);
+
+  void deallocate(const Address& address);
+
+  // Returns with the physical address of the conflicting cache line
+  Address cacheProbe(const Address& newAddress) const;
+
+  // looks an address up in the cache
+  ENTRY& lookup(const Address& address);
+  const ENTRY& lookup(const Address& address) const;
+
+  // Get/Set permission of cache block
+  AccessPermission getPermission(const Address& address) const;
+  void changePermission(const Address& address, AccessPermission new_perm);
+
+  // Print cache contents
+  void print(ostream& out) const;
+private:
+  // Private Methods
+
+  // Private copy constructor and assignment operator
+  PerfectCacheMemory(const PerfectCacheMemory& obj);
+  PerfectCacheMemory& operator=(const PerfectCacheMemory& obj);
+
+  // Data Members (m_prefix)
+  Map<Address, PerfectCacheLineState<ENTRY> > m_map;
+  AbstractChip* m_chip_ptr;
+};
+
+// Output operator declaration
+//ostream& operator<<(ostream& out, const PerfectCacheMemory<ENTRY>& obj);
+
+// ******************* Definitions *******************
+
+// Output operator definition
+template<class ENTRY>
+extern inline
+ostream& operator<<(ostream& out, const PerfectCacheMemory<ENTRY>& obj)
+{
+  obj.print(out);
+  out << flush;
+  return out;
+}
+
+
+// ****************************************************************
+
+template<class ENTRY>
+extern inline
+PerfectCacheMemory<ENTRY>::PerfectCacheMemory(AbstractChip* chip_ptr)
+{
+  m_chip_ptr = chip_ptr;
+}
+
+// STATIC METHODS
+
+template<class ENTRY>
+extern inline
+void PerfectCacheMemory<ENTRY>::printConfig(ostream& out)
+{
+}
+
+// PUBLIC METHODS
+
+template<class ENTRY>
+extern inline
+bool PerfectCacheMemory<ENTRY>::tryCacheAccess(const CacheMsg& msg, bool& block_stc, ENTRY*& entry)
+{
+  ERROR_MSG("not implemented");
+}
+
+// tests to see if an address is present in the cache
+template<class ENTRY>
+extern inline
+bool PerfectCacheMemory<ENTRY>::isTagPresent(const Address& address) const
+{
+  return m_map.exist(line_address(address));
+}
+
+template<class ENTRY>
+extern inline
+bool PerfectCacheMemory<ENTRY>::cacheAvail(const Address& address) const
+{
+  return true;
+}
+
+// find an Invalid or already allocated entry and sets the tag
+// appropriate for the address
+template<class ENTRY>
+extern inline
+void PerfectCacheMemory<ENTRY>::allocate(const Address& address)
+{
+  PerfectCacheLineState<ENTRY> line_state;
+  line_state.m_permission = AccessPermission_Busy;
+  line_state.m_entry = ENTRY();
+  m_map.add(line_address(address), line_state);
+}
+
+// deallocate entry
+template<class ENTRY>
+extern inline
+void PerfectCacheMemory<ENTRY>::deallocate(const Address& address)
+{
+  m_map.erase(line_address(address));
+}
+
+// Returns with the physical address of the conflicting cache line
+template<class ENTRY>
+extern inline
+Address PerfectCacheMemory<ENTRY>::cacheProbe(const Address& newAddress) const
+{
+  ERROR_MSG("cacheProbe called in perfect cache");
+}
+
+// looks an address up in the cache
+template<class ENTRY>
+extern inline
+ENTRY& PerfectCacheMemory<ENTRY>::lookup(const Address& address)
+{
+  return m_map.lookup(line_address(address)).m_entry;
+}
+
+// looks an address up in the cache
+template<class ENTRY>
+extern inline
+const ENTRY& PerfectCacheMemory<ENTRY>::lookup(const Address& address) const
+{
+  return m_map.lookup(line_address(address)).m_entry;
+}
+
+template<class ENTRY>
+extern inline
+AccessPermission PerfectCacheMemory<ENTRY>::getPermission(const Address& address) const
+{
+  return m_map.lookup(line_address(address)).m_permission;
+}
+
+template<class ENTRY>
+extern inline
+void PerfectCacheMemory<ENTRY>::changePermission(const Address& address, AccessPermission new_perm)
+{
+  Address line_address = address;
+  line_address.makeLineAddress();
+  PerfectCacheLineState<ENTRY>& line_state = m_map.lookup(line_address);
+  AccessPermission old_perm = line_state.m_permission;
+  line_state.m_permission = new_perm;
+}
+
+template<class ENTRY>
+extern inline
+void PerfectCacheMemory<ENTRY>::print(ostream& out) const
+{
+}
+
+#endif //PERFECTCACHEMEMORY_H