configs: Adds an example script for POWER Hello

Used the "power-hello" resource to make an
stdlib example script for that resource

Change-Id: Ia8a051330e263617aa0e2ef08321d01cfa1093c4
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/68737
Reviewed-by: Boris Shingarov <shingarov@labware.com>
Maintainer: Boris Shingarov <shingarov@labware.com>
Tested-by: kokoro <noreply+kokoro@google.com>

configs/example/gem5_library/power-hello.py

@@ -0,0 +1,89 @@
+# Copyright (c) 2023 The Regents of the University of California
+# 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.
+
+"""
+This gem5 configuation script creates a simple board to run a POWER
+"hello world" binary.
+
+This is setup is the close to the simplest setup possible using the gem5
+library. It does not contain any kind of caching, IO, or any non-essential
+components.
+
+Usage
+-----
+
+```
+scons build/POWER/gem5.opt
+./build/POWER/gem5.opt configs/example/gem5_library/power-hello.py
+```
+"""
+
+from gem5.isas import ISA
+from gem5.utils.requires import requires
+from gem5.resources.resource import Resource
+from gem5.components.memory import SingleChannelDDR4_2400
+from gem5.components.processors.cpu_types import CPUTypes
+from gem5.components.boards.simple_board import SimpleBoard
+from gem5.components.cachehierarchies.classic.no_cache import NoCache
+from gem5.components.processors.simple_processor import SimpleProcessor
+from gem5.simulate.simulator import Simulator
+
+# This check ensures the gem5 binary is compiled to the POWER ISA target.
+# If not, an exception will be thrown.
+requires(isa_required=ISA.POWER)
+
+# In this setup we don't have a cache. `NoCache` can be used for such setups.
+cache_hierarchy = NoCache()
+
+# We use a single channel DDR4_2400 memory system
+memory = SingleChannelDDR4_2400(size="32MB")
+
+# We use a simple ATOMIC processor with one core.
+processor = SimpleProcessor(
+    cpu_type=CPUTypes.ATOMIC, isa=ISA.POWER, num_cores=1
+)
+
+# The gem5 library simple board which can be used to run simple SE-mode
+# simulations.
+board = SimpleBoard(
+    clk_freq="3GHz",
+    processor=processor,
+    memory=memory,
+    cache_hierarchy=cache_hierarchy,
+)
+
+board.set_se_binary_workload(Resource("power-hello"))
+
+# Lastly we run the simulation.
+simulator = Simulator(board=board)
+simulator.run()
+
+print(
+    "Exiting @ tick {} because {}.".format(
+        simulator.get_current_tick(),
+        simulator.get_last_exit_event_cause(),
+    )
+)