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+# Copyright 2018 Google, Inc.
+#
+# 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: Gabe Black
+
+import argparse
+import m5
+import sys
+
+from m5.objects import SystemC_Kernel, Root
+
+# pylint:disable=unused-variable
+
+# The python version of the systemc kernel acts as an interface to sc_main. The
+# c++ version of the kernel object has a lot of important jobs supporting
+# systemc objects and needs to exist in simulations using systemc.
+kernel = SystemC_Kernel()
+root = Root(full_system=True, systemc_kernel=kernel)
+
+parser = argparse.ArgumentParser()
+parser.add_argument('--word', action="append", default=[],
+ help='Add a word to the list of words to print. Can be repeated.')
+
+args = parser.parse_args()
+
+# Tell gem5 to run the c++ sc_main function. If one isn't defined, gem5 will
+# detect that and report an error. If gem5 isn't finding your sc_main, make
+# sure its signature matches exactly so your compiler doesn't think it's a
+# different function.
+#
+# The arguements passed to this function will be treated as the argv values
+# passed to the c++ sc_main, with the argc value set appropriately.
+kernel.sc_main(*args.word);
+
+# Construct the SimObject hierarchy. Anything sc_main built has already been
+# constructed.
+m5.instantiate(None)
+
+# Run the simulation until something kicks us back to the config file. sc_main
+# will be at the point it first called sc_start and may keep executing as the
+# simulation runs, or it may be completed if it never called sc_start.
+cause = m5.simulate(m5.MaxTick).getCause()
+
+# If sc_main finished, extract what it returned and do something with it.
+result = kernel.sc_main_result()
+if result.code != 0:
+ sys.exit(int(result.code))