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diff --git a/src/systemc/core/time.cc b/src/systemc/core/time.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/time.hh"
+
+#include "systemc/ext/core/sc_time.hh"
+
+namespace sc_gem5
+{
+
+const char *TimeUnitNames[] = {
+    [::sc_core::SC_FS] = "fs",
+    [::sc_core::SC_PS] = "ps",
+    [::sc_core::SC_NS] = "ns",
+    [::sc_core::SC_US] = "us",
+    [::sc_core::SC_MS] = "ms",
+    [::sc_core::SC_SEC] = "s"
+};
+
+double TimeUnitScale[] = {
+    [::sc_core::SC_FS] = 1.0e-15,
+    [::sc_core::SC_PS] = 1.0e-12,
+    [::sc_core::SC_NS] = 1.0e-9,
+    [::sc_core::SC_US] = 1.0e-6,
+    [::sc_core::SC_MS] = 1.0e-3,
+    [::sc_core::SC_SEC] = 1.0
+};
+
+Tick TimeUnitFrequency[] = {
+    [::sc_core::SC_FS] = 1ULL * 1000 * 1000 * 1000 * 1000 * 1000,
+    [::sc_core::SC_PS] = 1ULL * 1000 * 1000 * 1000 * 1000,
+    [::sc_core::SC_NS] = 1ULL * 1000 * 1000 * 1000,
+    [::sc_core::SC_US] = 1ULL * 1000 * 1000,
+    [::sc_core::SC_MS] = 1ULL * 1000,
+    [::sc_core::SC_SEC] = 1ULL
+};
+
+} // namespace sc_gem5