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diff --git a/src/mem/ruby/network/MessageBufferNode.hh b/src/mem/ruby/network/MessageBufferNode.hh
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+++ b/src/mem/ruby/network/MessageBufferNode.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_BUFFERS_MESSAGEBUFFERNODE_HH__
+#define __MEM_RUBY_BUFFERS_MESSAGEBUFFERNODE_HH__
+
+#include <iostream>
+
+#include "mem/ruby/slicc_interface/Message.hh"
+
+class MessageBufferNode
+{
+  public:
+    MessageBufferNode()
+        : m_time(0), m_msg_counter(0)
+    {}
+
+    MessageBufferNode(const Tick time, uint64_t counter,
+                      const MsgPtr& msgptr)
+        : m_time(time), m_msg_counter(counter), m_msgptr(msgptr)
+    {}
+
+    void print(std::ostream& out) const;
+
+  public:
+    Tick m_time;
+    uint64_t m_msg_counter; // FIXME, should this be a 64-bit value?
+    MsgPtr m_msgptr;
+};
+
+inline bool
+operator>(const MessageBufferNode& n1, const MessageBufferNode& n2)
+{
+    if (n1.m_time == n2.m_time) {
+        assert(n1.m_msg_counter != n2.m_msg_counter);
+        return n1.m_msg_counter > n2.m_msg_counter;
+    } else {
+        return n1.m_time > n2.m_time;
+    }
+}
+
+inline std::ostream&
+operator<<(std::ostream& out, const MessageBufferNode& obj)
+{
+    obj.print(out);
+    out << std::flush;
+    return out;
+}
+
+#endif // __MEM_RUBY_BUFFERS_MESSAGEBUFFERNODE_HH__