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diff --git a/sim/sim_time.cc b/sim/sim_time.cc
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+++ b/sim/sim_time.cc
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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.
+ */
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <time.h>
+#include <iostream>
+
+#include "sim_time.hh"
+
+using namespace std;
+
+namespace Time
+{
+    struct _timeval
+    {
+        timeval tv;
+    };
+
+    double
+    convert(const timeval &tv)
+    {
+        return (double)tv.tv_sec + (double)tv.tv_usec / 1000000.0;
+    }
+
+    Start::Start()
+    {
+        start = new _timeval;
+        ::gettimeofday(&start->tv, NULL);
+    }
+
+    Start::~Start()
+    {
+        delete start;
+    }
+
+    const timeval &
+    Start::get() const
+    {
+        return start->tv;
+    }
+
+    double
+    Start::operator()() const
+    {
+        return convert(get());
+    }
+
+    Now::Now()
+        : now(0)
+    {
+    }
+
+    Now::~Now()
+    {
+        if (now)
+            delete now;
+    }
+
+    const timeval &
+    Now::get() const
+    {
+        if (!now)
+            now = new _timeval;
+
+        ::gettimeofday(&now->tv, NULL);
+        return now->tv;
+    }
+
+    double
+    Now::operator()() const
+    {
+        return convert(get());
+    }
+
+
+    Elapsed::Elapsed()
+        : elapsed(0)
+    {}
+
+    Elapsed::~Elapsed()
+    {
+        if (elapsed)
+            delete elapsed;
+    }
+
+    const timeval &
+    Elapsed::get() const
+    {
+        if (!elapsed)
+            elapsed = new _timeval;
+
+        timersub(&now.get(), &start.get(), &elapsed->tv);
+        return elapsed->tv;
+    }
+
+    double
+    Elapsed::operator()() const
+    {
+        return convert(get());
+    }
+
+    Start start;
+    Now now;
+    Elapsed elapsed;
+
+    ostream &
+    operator<<(ostream &out, const Start &start)
+    {
+        out << ::ctime(&start.get().tv_sec);
+        return out;
+    }
+
+    ostream &
+    operator<<(ostream &out, const Now &now)
+    {
+        out << ::ctime(&now.get().tv_sec);
+        return out;
+    }
+
+    ostream &
+    operator<<(ostream &out, const Elapsed &elapsed)
+    {
+        out << ::ctime(&elapsed.get().tv_sec);
+        return out;
+    }
+}