Crossbar.py revision 9100:3caf131d7a95 
1# Copyright (c) 2010 Advanced Micro Devices, Inc.
2# All rights reserved.
3#
4# Redistribution and use in source and binary forms, with or without
5# modification, are permitted provided that the following conditions are
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8# redistributions in binary form must reproduce the above copyright
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11# neither the name of the copyright holders nor the names of its
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13# this software without specific prior written permission.
14#
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 BaseTopology
33
34class Crossbar(BaseTopology):
35    description='Crossbar'
36
37    def __init__(self, controllers):
38        self.nodes = controllers
39
40    def makeTopology(self, options, IntLink, ExtLink, Router):
41        # Create an individual router for each controller plus one more for the
42        # centralized crossbar.  The large numbers of routers are needed because
43        # external links do not model outgoing bandwidth in the simple network, but
44        # internal links do.
45
46        routers = [Router(router_id=i) for i in range(len(self.nodes)+1)]
47        ext_links = [ExtLink(link_id=i, ext_node=n, int_node=routers[i])
48                        for (i, n) in enumerate(self.nodes)]
49        link_count = len(self.nodes)
50        xbar = routers[len(self.nodes)] # the crossbar router is the last router created
51        int_links = [IntLink(link_id=(link_count+i),
52                             node_a=routers[i], node_b=xbar)
53                        for i in range(len(self.nodes))]
54
55        return routers, int_links, ext_links
56
57