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diff --git a/sim/sim_time.hh b/sim/sim_time.hh
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+/*
+ * Copyright (c) 2003 The Regents of The University of Michigan
+ * 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 __SIM_TIME_HH__
+#define __SIM_TIME_HH__
+
+#include <iosfwd>
+
+namespace Time {
+    struct _timeval;
+    class Start
+    {
+      private:
+        mutable _timeval *start;
+
+      public:
+        Start();
+        ~Start();
+
+        const timeval &get() const;
+        double operator()() const;
+    };
+
+    class Now
+    {
+      private:
+        mutable _timeval *now;
+
+      public:
+        Now();
+        ~Now();
+
+        const timeval &get() const;
+        double operator()() const;
+    };
+
+    class Elapsed
+    {
+      private:
+        mutable _timeval *elapsed;
+
+      public:
+        Elapsed();
+        ~Elapsed();
+
+        const timeval &get() const;
+        double operator()() const;
+    };
+
+    extern Start start;
+    extern Now now;
+    extern Elapsed elapsed;
+
+    std::ostream &operator<<(std::ostream &out, const Start &start);
+    std::ostream &operator<<(std::ostream &out, const Now &now);
+    std::ostream &operator<<(std::ostream &out, const Elapsed &elapsed);
+}
+
+#endif // __SIM_TIME_HH__