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+# -*- coding: utf-8 -*-
+# Copyright (c) 2015 Jason Power
+# 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: Jason Lowe-Power
+
+""" This file creates a system with Ruby caches and runs the ruby random tester
+See Part 3 in the Learning gem5 book: learning.gem5.org/book/part3
+
+IMPORTANT: If you modify this file, it's likely that the Learning gem5 book
+           also needs to be updated. For now, email Jason <jason@lowepower.com>
+
+"""
+from __future__ import print_function
+
+# import the m5 (gem5) library created when gem5 is built
+import m5
+# import all of the SimObjects
+from m5.objects import *
+
+from test_caches import TestCacheSystem
+
+# create the system we are going to simulate
+system = System()
+
+# Set the clock fequency of the system (and all of its children)
+system.clk_domain = SrcClockDomain()
+system.clk_domain.clock = '1GHz'
+system.clk_domain.voltage_domain = VoltageDomain()
+
+# Set up the system
+system.mem_mode = 'timing'               # Use timing accesses
+system.mem_ranges = [AddrRange('512MB')] # Create an address range
+
+# Create the tester
+system.tester = RubyTester(checks_to_complete = 100,
+                           wakeup_frequency = 10,
+                           num_cpus = 2)
+
+# Create a DDR3 memory controller and connect it to the membus
+system.mem_ctrl = DDR3_1600_8x8()
+system.mem_ctrl.range = system.mem_ranges[0]
+
+# Create the Ruby System
+system.caches = TestCacheSystem()
+system.caches.setup(system, system.tester, [system.mem_ctrl])
+
+# set up the root SimObject and start the simulation
+root = Root(full_system = False, system = system)
+
+# Not much point in this being higher than the L1 latency
+m5.ticks.setGlobalFrequency('1ns')
+
+# instantiate all of the objects we've created above
+m5.instantiate()
+
+print("Beginning simulation!")
+exit_event = m5.simulate()
+print('Exiting @ tick {} because {}'.format(
+         m5.curTick(), exit_event.getCause())
+     )