ruby: Ruby memtest python script.

diff --git a/configs/example/memtest-ruby.py b/configs/example/memtest-ruby.py
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+# Copyright (c) 2006-2007 The Regents of The University of Michigan
+# Copyright (c) 2009 Advanced Micro Devices, Inc.
+# 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: Ron Dreslinski
+#          Brad Beckmann
+
+import m5
+from m5.objects import *
+from m5.defines import buildEnv
+from m5.util import addToPath
+import os, optparse, sys
+addToPath('../common')
+addToPath('../../tests/configs/')
+import ruby_config
+
+parser = optparse.OptionParser()
+
+parser.add_option("-a", "--atomic", action="store_true",
+                  help="Use atomic (non-timing) mode")
+parser.add_option("-b", "--blocking", action="store_true",
+                  help="Use blocking caches")
+parser.add_option("-l", "--maxloads", metavar="N", default=0,
+                  help="Stop after N loads")
+parser.add_option("-m", "--maxtick", type="int", default=m5.MaxTick,
+                  metavar="T",
+                  help="Stop after T ticks")
+
+parser.add_option("-t", "--testers", type="int", metavar="N", default=1,
+                  help="number of testers/cores")
+
+parser.add_option("-f", "--functional", type="int", default=0,
+                  metavar="PCT",
+                  help="Target percentage of functional accesses "
+                  "[default: %default]")
+parser.add_option("-u", "--uncacheable", type="int", default=0,
+                  metavar="PCT",
+                  help="Target percentage of uncacheable accesses "
+                  "[default: %default]")
+
+parser.add_option("--progress", type="int", default=1000,
+                  metavar="NLOADS",
+                  help="Progress message interval "
+                  "[default: %default]")
+
+(options, args) = parser.parse_args()
+
+if args:
+     print "Error: script doesn't take any positional arguments"
+     sys.exit(1)
+
+block_size = 64
+
+if options.testers > block_size:
+     print "Error: Number of testers %d limited to %d because of false sharing" \
+           % (options.testers, block_size)
+     sys.exit(1)
+
+cpus = [ MemTest(atomic=options.atomic, max_loads=options.maxloads, \
+                 percent_functional=options.functional, \
+                 percent_uncacheable=options.uncacheable, \
+                 progress_interval=options.progress) \
+         for i in xrange(options.testers) ]
+
+# create the desired simulated system
+# ruby memory
+ruby_memory = ruby_config.generate("MI_example-homogeneous.rb", options.testers)
+
+system = System(cpu = cpus, funcmem = PhysicalMemory(),
+                physmem = ruby_memory)
+
+for cpu in cpus:
+     cpu.test = system.physmem.port
+     cpu.functional = system.funcmem.port
+
+
+# -----------------------
+# run simulation
+# -----------------------
+
+root = Root( system = system )
+if options.atomic:
+    root.system.mem_mode = 'atomic'
+else:
+    root.system.mem_mode = 'timing'
+
+# Not much point in this being higher than the L1 latency
+m5.ticks.setGlobalFrequency('1ns')
+
+# instantiate configuration
+m5.instantiate(root)
+
+# simulate until program terminates
+exit_event = m5.simulate(options.maxtick)
+
+print 'Exiting @ tick', m5.curTick(), 'because', exit_event.getCause()