Crossbar.py revision 9862:54d6728d99cf 
1# Copyright (c) 2010 Advanced Micro Devices, Inc.
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15# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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26#
27# Authors: Steve Reinhardt
28
29from m5.params import *
30from m5.objects import *
31
32from BaseTopology import SimpleTopology
33
34class Crossbar(SimpleTopology):
35    description='Crossbar'
36
37    def makeTopology(self, options, network, IntLink, ExtLink, Router):
38        # Create an individual router for each controller plus one more for
39        # the centralized crossbar.  The large numbers of routers are needed
40        # because external links do not model outgoing bandwidth in the
41        # simple network, but internal links do.
42
43        routers = [Router(router_id=i) for i in range(len(self.nodes)+1)]
44        xbar = routers[len(self.nodes)] # the crossbar router is the last router created
45        network.routers = routers
46
47        ext_links = [ExtLink(link_id=i, ext_node=n, int_node=routers[i])
48                        for (i, n) in enumerate(self.nodes)]
49        network.ext_links = ext_links
50
51        link_count = len(self.nodes)
52        int_links = [IntLink(link_id=(link_count+i),
53                             node_a=routers[i], node_b=xbar)
54                        for i in range(len(self.nodes))]
55        network.int_links = int_links
56