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diff --git a/src/mem/ruby/common/MachineID.hh b/src/mem/ruby/common/MachineID.hh
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+++ b/src/mem/ruby/common/MachineID.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_MACHINEID_HH__
+#define __MEM_RUBY_SYSTEM_MACHINEID_HH__
+
+#include <iostream>
+#include <string>
+
+#include "base/cprintf.hh"
+#include "mem/protocol/MachineType.hh"
+
+struct MachineID
+{
+    MachineType type;
+    //! range: 0 ... number of this machine's components in system - 1
+    NodeID num;
+
+    MachineType getType() const { return type; }
+    NodeID getNum() const { return num; }
+};
+
+inline std::string
+MachineIDToString(MachineID machine)
+{
+    return csprintf("%s_%d", MachineType_to_string(machine.type), machine.num);
+}
+
+inline bool
+operator==(const MachineID & obj1, const MachineID & obj2)
+{
+    return (obj1.type == obj2.type && obj1.num == obj2.num);
+}
+
+inline bool
+operator!=(const MachineID & obj1, const MachineID & obj2)
+{
+    return (obj1.type != obj2.type || obj1.num != obj2.num);
+}
+
+// Output operator declaration
+std::ostream& operator<<(std::ostream& out, const MachineID& obj);
+
+inline std::ostream&
+operator<<(std::ostream& out, const MachineID& obj)
+{
+    if ((obj.type < MachineType_NUM) && (obj.type >= MachineType_FIRST)) {
+        out << MachineType_to_string(obj.type);
+    } else {
+        out << "NULL";
+    }
+    out << "-";
+    out << obj.num;
+    out << std::flush;
+    return out;
+}
+
+#endif // __MEM_RUBY_SYSTEM_MACHINEID_HH__