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diff --git a/src/mem/ruby/common/Driver.hh b/src/mem/ruby/common/Driver.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 DRIVER_H
+#define DRIVER_H
+
+#include "mem/ruby/common/Global.hh"
+#include "mem/ruby/common/Consumer.hh"
+#include "mem/ruby/system/NodeID.hh"
+#include "mem/protocol/CacheRequestType.hh"
+#include "mem/packet.hh"
+
+class RubySystem;
+class SubBlock;
+class Address;
+class MachineID;
+class SimicsHypervisor;
+
+class Driver {
+public:
+  // Constructors
+  Driver();
+
+  // Destructor
+  virtual ~Driver() = 0;
+
+  // Public Methods
+  virtual void get_network_config() {}
+  virtual void hitCallback(Packet* pkt) = 0;
+  virtual integer_t getInstructionCount(int procID) const { return 1; }
+  virtual integer_t getCycleCount(int procID) const { return 1; }
+
+  virtual void printDebug(){}  //called by Sequencer
+
+  virtual void printStats(ostream& out) const = 0;
+  virtual void clearStats() = 0;
+
+  virtual void printConfig(ostream& out) const = 0;
+
+  virtual integer_t readPhysicalMemory(int procID, physical_address_t address,
+                                       int len ){ ASSERT(0); return 0; }
+
+  virtual void writePhysicalMemory( int procID, physical_address_t address,
+                                    integer_t value, int len ){ ASSERT(0); }
+
+protected:
+  // accessible by subclasses
+
+private:
+  // inaccessible by subclasses
+
+};
+
+#endif //DRIVER_H