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diff --git a/src/base/hashmap.hh b/src/base/hashmap.hh
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+/*
+ * Copyright (c) 2003-2005 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: Nathan Binkert
+ */
+
+#ifndef __HASHMAP_HH__
+#define __HASHMAP_HH__
+
+#if defined(__GNUC__) && __GNUC__ >= 3
+#include <ext/hash_map>
+#else
+#include <hash_map>
+#endif
+
+#include <string>
+
+#include "sim/host.hh"
+
+#if defined(__GNUC__) && __GNUC__ >= 3
+    #define __hash_namespace __gnu_cxx
+#else
+    #define __hash_namespace std
+#endif
+
+namespace m5 {
+    using ::__hash_namespace::hash_multimap;
+    using ::__hash_namespace::hash_map;
+    using ::__hash_namespace::hash;
+}
+
+
+///////////////////////////////////
+// Some default Hashing Functions
+//
+
+namespace __hash_namespace {
+#if !defined(__LP64__) && !defined(__alpha__)
+    template<>
+    struct hash<uint64_t> {
+        size_t operator()(uint64_t r) const {
+            return r;
+        }
+    };
+
+    template<>
+    struct hash<int64_t> {
+        size_t operator()(int64_t r) const {
+            return r;
+        };
+    };
+#endif
+
+    template<>
+    struct hash<std::string> {
+        size_t operator()(const std::string &s) const {
+            return(__stl_hash_string(s.c_str()));
+        }
+    };
+}
+
+
+#endif // __HASHMAP_HH__