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diff --git a/src/systemc/core/scheduler.cc b/src/systemc/core/scheduler.cc
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+/*
+ * Copyright 2018 Google, Inc.
+ *
+ * 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.
+ *
+ * Authors: Gabe Black
+ */
+
+#include "systemc/core/scheduler.hh"
+
+#include "base/fiber.hh"
+
+namespace sc_gem5
+{
+
+Scheduler::Scheduler() : _numCycles(0), _current(nullptr) {}
+
+void
+Scheduler::initialize()
+{
+    update();
+
+    while (!initList.empty())
+        ready(initList.getNext());
+
+    delta();
+}
+
+void
+Scheduler::runCycles()
+{
+    while (!readyList.empty()) {
+        evaluate();
+        update();
+        delta();
+    }
+}
+
+void
+Scheduler::yield()
+{
+    _current = readyList.getNext();
+    if (!_current) {
+        // There are no more processes, so return control to evaluate.
+        Fiber::primaryFiber()->run();
+    } else {
+        _current->popListNode();
+        // Switch to whatever Fiber is supposed to run this process. All
+        // Fibers which aren't running should be parked at this line.
+        _current->fiber()->run();
+        // If the current process hasn't been started yet, start it. This
+        // should always be true for methods, but may not be true for threads.
+        if (_current && !_current->running())
+            _current->run();
+    }
+}
+
+void
+Scheduler::evaluate()
+{
+    if (!readyList.empty())
+        _numCycles++;
+
+    do {
+        yield();
+    } while (!readyList.empty());
+}
+
+void
+Scheduler::update()
+{
+}
+
+void
+Scheduler::delta()
+{
+}
+
+Scheduler scheduler;
+
+} // namespace sc_gem5