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diff --git a/src/arch/power/types.hh b/src/arch/power/types.hh
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+/*
+ * Copyright (c) 2009 The University of Edinburgh
+ * 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: Timothy M. Jones
+ */
+
+#ifndef __ARCH_POWER_TYPES_HH__
+#define __ARCH_POWER_TYPES_HH__
+
+#include "base/bitunion.hh"
+#include "base/types.hh"
+
+namespace PowerISA
+{
+
+typedef uint32_t MachInst;
+
+BitUnion32(ExtMachInst)
+
+    // Registers
+    Bitfield<25, 21> rs;
+    Bitfield<20, 16> ra;
+
+    // Shifts and masks
+    Bitfield<15, 11> sh;
+    Bitfield<10,  6> mb;
+    Bitfield< 5,  1> me;
+
+    // Immediate fields
+    Bitfield<15,  0> si;
+    Bitfield<15,  0> d;
+
+    // Special purpose register identifier
+    Bitfield<20, 11> spr;
+    Bitfield<25,  2> li;
+    Bitfield<1>      aa;
+    Bitfield<25, 23> bf;
+    Bitfield<15,  2> bd;
+    Bitfield<25, 21> bo;
+    Bitfield<20, 16> bi;
+    Bitfield<20, 18> bfa;
+
+    // Record bits
+    Bitfield<0>      rc31;
+    Bitfield<10>     oe;
+
+    // Condition register fields
+    Bitfield<25, 21> bt;
+    Bitfield<20, 16> ba;
+    Bitfield<15, 11> bb;
+
+    // FXM field for mtcrf instruction
+    Bitfield<19, 12> fxm;
+EndBitUnion(ExtMachInst)
+
+// typedef uint64_t LargestRead;
+// // Need to use 64 bits to make sure that read requests get handled properly
+
+// typedef int RegContextParam;
+// typedef int RegContextVal;
+
+struct CoreSpecific {
+};
+
+} // PowerISA namspace
+
+#endif // __ARCH_POWER_TYPES_HH__