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diff --git a/src/base/bigint.hh b/src/base/bigint.hh
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+/*
+ * Copyright (c) 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: Ali Saidi
+ */
+
+#include "base/misc.hh"
+
+#include <iostream>
+
+#ifndef __BASE_BIGINT_HH__
+#define __BASE_BIGINT_HH__
+// Create a couple of large int types for atomic reads
+struct m5_twin64_t {
+    uint64_t a;
+    uint64_t b;
+    m5_twin64_t()
+    {}
+    m5_twin64_t(const uint64_t x)
+    {
+        a = x;
+        b = x;
+    }
+    inline m5_twin64_t& operator=(const uint64_t x)
+    {
+        a = x;
+        b = x;
+        return *this;
+    }
+
+    operator uint64_t()
+    {
+        panic("Tried to cram a twin64_t into an integer!\n");
+        return a;
+    }
+};
+
+struct m5_twin32_t {
+    uint32_t a;
+    uint32_t b;
+    m5_twin32_t()
+    {}
+    m5_twin32_t(const uint32_t x)
+    {
+        a = x;
+        b = x;
+    }
+    inline m5_twin32_t& operator=(const uint32_t x)
+    {
+        a = x;
+        b = x;
+        return *this;
+    }
+
+    operator uint32_t()
+    {
+        panic("Tried to cram a twin32_t into an integer!\n");
+        return a;
+    }
+};
+
+
+// This is for twin loads (two 64 bit values), not 1 128 bit value (as far as
+// endian conversion is concerned!
+typedef m5_twin64_t Twin64_t;
+typedef m5_twin32_t Twin32_t;
+
+// Output operator overloads
+std::ostream & operator << (std::ostream & os, const Twin64_t & t);
+std::ostream & operator << (std::ostream & os, const Twin32_t & t);
+
+#endif // __BASE_BIGINT_HH__
+