Crossbar.py revision 9148:a7a72f42919e 
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
6# met: redistributions of source code must retain the above copyright
7# notice, this list of conditions and the following disclaimer;
8# redistributions in binary form must reproduce the above copyright
9# notice, this list of conditions and the following disclaimer in the
10# documentation and/or other materials provided with the distribution;
11# neither the name of the copyright holders nor the names of its
12# contributors may be used to endorse or promote products derived from
13# this software without specific prior written permission.
14#
15# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
19# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
21# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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, IntLink, ExtLink, Router):
38        # Create an individual router for each controller plus one more for the
39        # centralized crossbar.  The large numbers of routers are needed because
40        # external links do not model outgoing bandwidth in the simple network, but
41        # internal links do.
42
43        routers = [Router(router_id=i) for i in range(len(self.nodes)+1)]
44        ext_links = [ExtLink(link_id=i, ext_node=n, int_node=routers[i])
45                        for (i, n) in enumerate(self.nodes)]
46        link_count = len(self.nodes)
47        xbar = routers[len(self.nodes)] # the crossbar router is the last router created
48        int_links = [IntLink(link_id=(link_count+i),
49                             node_a=routers[i], node_b=xbar)
50                        for i in range(len(self.nodes))]
51
52        return routers, int_links, ext_links
53