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diff --git a/src/cpu/o3/cpu_builder.cc b/src/cpu/o3/cpu_builder.cc
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+++ b/src/cpu/o3/cpu_builder.cc
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+/*
+ * Copyright (c) 2004-2006 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.
+ *
+ * Authors: Kevin Lim
+ */
+
+#include <string>
+
+#include "config/full_system.hh"
+#include "config/use_checker.hh"
+#include "cpu/o3/cpu.hh"
+#include "cpu/o3/impl.hh"
+#include "params/DerivO3CPU.hh"
+
+class DerivO3CPU : public FullO3CPU<O3CPUImpl>
+{
+  public:
+    DerivO3CPU(DerivO3CPUParams *p)
+        : FullO3CPU<O3CPUImpl>(p)
+    { }
+};
+
+DerivO3CPU *
+DerivO3CPUParams::create()
+{
+#if FULL_SYSTEM
+    // Full-system only supports a single thread for the moment.
+    int actual_num_threads = 1;
+#else
+    // In non-full-system mode, we infer the number of threads from
+    // the workload if it's not explicitly specified.
+    int actual_num_threads =
+        (numThreads >= workload.size()) ? numThreads : workload.size();
+
+    if (workload.size() == 0) {
+        fatal("Must specify at least one workload!");
+    }
+#endif
+
+    numThreads = actual_num_threads;
+
+    // Default smtFetchPolicy to "RoundRobin", if necessary.
+    std::string round_robin_policy = "RoundRobin";
+    std::string single_thread = "SingleThread";
+
+    if (actual_num_threads > 1 && single_thread.compare(smtFetchPolicy) == 0)
+        smtFetchPolicy = round_robin_policy;
+    else
+        smtFetchPolicy = smtFetchPolicy;
+
+    instShiftAmt = 2;
+
+    return new DerivO3CPU(this);
+}