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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 *
class Crossbar(Topology):
description='Crossbar'
def makeTopology(nodes, 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(nodes)+1)]
ext_links = [ExtLink(link_id=i, ext_node=n, int_node=routers[i])
for (i, n) in enumerate(nodes)]
link_count = len(nodes)
xbar = routers[len(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(nodes))]
return Crossbar(ext_links=ext_links, int_links=int_links,
routers=routers)
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