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diff --git a/src/cpu/cpu_models.py b/src/cpu/cpu_models.py
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+# Copyright (c) 2003-2006 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.
+
+################
+# CpuModel class
+#
+# The CpuModel class encapsulates everything the ISA parser needs to
+# know about a particular CPU model.
+
+class CpuModel:
+    # Dict of available CPU model objects.  Accessible as CpuModel.dict.
+    dict = {}
+
+    # Constructor.  Automatically adds models to CpuModel.dict.
+    def __init__(self, name, filename, includes, strings):
+        self.name = name
+        self.filename = filename   # filename for output exec code
+        self.includes = includes   # include files needed in exec file
+        # The 'strings' dict holds all the per-CPU symbols we can
+        # substitute into templates etc.
+        self.strings = strings
+        # Add self to dict
+        CpuModel.dict[name] = self
+
+
+#
+# Define CPU models.
+#
+# Parameters are:
+#   - name of model
+#   - filename for generated ISA execution file
+#   - includes needed for generated ISA execution file
+#   - substitution strings for ISA description templates
+#
+
+CpuModel('AtomicSimpleCPU', 'atomic_simple_cpu_exec.cc',
+         '#include "cpu/simple/atomic.hh"',
+         { 'CPU_exec_context': 'AtomicSimpleCPU' })
+CpuModel('TimingSimpleCPU', 'timing_simple_cpu_exec.cc',
+         '#include "cpu/simple/timing.hh"',
+         { 'CPU_exec_context': 'TimingSimpleCPU' })
+CpuModel('FastCPU', 'fast_cpu_exec.cc',
+         '#include "cpu/fast/cpu.hh"',
+         { 'CPU_exec_context': 'FastCPU' })
+CpuModel('FullCPU', 'full_cpu_exec.cc',
+         '#include "encumbered/cpu/full/dyn_inst.hh"',
+         { 'CPU_exec_context': 'DynInst' })
+CpuModel('AlphaFullCPU', 'alpha_o3_exec.cc',
+         '#include "cpu/o3/alpha_dyn_inst.hh"',
+         { 'CPU_exec_context': 'AlphaDynInst<AlphaSimpleImpl>' })
+