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diff --git a/configs/topologies/Crossbar.py b/configs/topologies/Crossbar.py
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+# Copyright (c) 2010 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: Steve Reinhardt
+
+from m5.params import *
+from m5.objects import *
+
+from BaseTopology import BaseTopology
+
+class Crossbar(BaseTopology):
+    description='Crossbar'
+
+    def __init__(self, controllers):
+        self.nodes = controllers
+
+    def makeTopology(self, options, IntLink, ExtLink, Router):
+        # Create an individual router for each controller plus one more for the
+        # centralized crossbar.  The large numbers of routers are needed because
+        # external links do not model outgoing bandwidth in the simple network, but
+        # internal links do.
+
+        routers = [Router(router_id=i) for i in range(len(self.nodes)+1)]
+        ext_links = [ExtLink(link_id=i, ext_node=n, int_node=routers[i])
+                        for (i, n) in enumerate(self.nodes)]
+        link_count = len(self.nodes)
+        xbar = routers[len(self.nodes)] # the crossbar router is the last router created
+        int_links = [IntLink(link_id=(link_count+i),
+                             node_a=routers[i], node_b=xbar)
+                        for i in range(len(self.nodes))]
+
+        return routers, int_links, ext_links
+