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# Copyright (c) 2010 Advanced Micro Devices, Inc.
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#
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# redistributions in binary form must reproduce the above copyright
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# neither the name of the copyright holders nor the names of its
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# this software without specific prior written permission.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# Authors: Steve Reinhardt
from m5.params import *
from m5.objects import *
from BaseTopology import SimpleTopology
class Crossbar(SimpleTopology):
description='Crossbar'
def makeTopology(self, options, network, IntLink, ExtLink, Router):
# default values for link latency and router latency.
# Can be over-ridden on a per link/router basis
link_latency = options.link_latency # used by simple and garnet
router_latency = options.router_latency # only used by garnet
# 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.
# For garnet, one router suffices, use CrossbarGarnet.py
routers = [Router(router_id=i) for i in range(len(self.nodes)+1)]
xbar = routers[len(self.nodes)] # the crossbar router is the last router created
network.routers = routers
ext_links = [ExtLink(link_id=i, ext_node=n, int_node=routers[i],
latency = link_latency)
for (i, n) in enumerate(self.nodes)]
network.ext_links = ext_links
link_count = len(self.nodes)
int_links = []
for i in range(len(self.nodes)):
int_links.append(IntLink(link_id=(link_count+i),
src_node=routers[i],
dst_node=xbar,
latency = link_latency))
link_count += len(self.nodes)
for i in range(len(self.nodes)):
int_links.append(IntLink(link_id=(link_count+i),
src_node=xbar,
dst_node=routers[i],
latency = link_latency))
network.int_links = int_links