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diff --git a/src/arch/mips/types.hh b/src/arch/mips/types.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.
+ */
+
+#ifndef __ARCH_MIPS_TYPES_HH__
+#define __ARCH_MIPS_TYPES_HH__
+
+#include "sim/host.hh"
+
+namespace MipsISA
+{
+    typedef uint32_t MachInst;
+    typedef uint64_t ExtMachInst;
+    typedef uint8_t  RegIndex;
+
+    typedef uint32_t IntReg;
+
+    // floating point register file entry type
+    typedef double FloatReg;
+    typedef uint32_t FloatReg32;
+    typedef uint64_t FloatReg64;
+    typedef uint64_t FloatRegBits;
+
+    // cop-0/cop-1 system control register
+    typedef uint64_t MiscReg;
+    typedef uint64_t InternalProcReg;
+
+    typedef union {
+        IntReg   intreg;
+        FloatReg fpreg;
+        MiscReg  ctrlreg;
+    } AnyReg;
+
+    //used in FP convert & round function
+    enum ConvertType{
+        SINGLE_TO_DOUBLE,
+        SINGLE_TO_WORD,
+        SINGLE_TO_LONG,
+
+        DOUBLE_TO_SINGLE,
+        DOUBLE_TO_WORD,
+        DOUBLE_TO_LONG,
+
+        LONG_TO_SINGLE,
+        LONG_TO_DOUBLE,
+        LONG_TO_WORD,
+        LONG_TO_PS,
+
+        WORD_TO_SINGLE,
+        WORD_TO_DOUBLE,
+        WORD_TO_LONG,
+        WORD_TO_PS,
+
+        PL_TO_SINGLE,
+        PU_TO_SINGLE
+    };
+
+    //used in FP convert & round function
+    enum RoundMode{
+        RND_ZERO,
+        RND_DOWN,
+        RND_UP,
+        RND_NEAREST
+   };
+
+} // namespace MipsISA
+
+#endif