XBar.py revision 5354 
1# Copyright (c) 2005-2008 The Regents of The University of Michigan
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
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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: Nathan Binkert
28
29from m5 import build_env
30from m5.params import *
31from m5.proxy import *
32from MemObject import MemObject
33
34if build_env['FULL_SYSTEM']:
35    from Device import BadAddr
36
37class Bus(MemObject):
38    type = 'Bus'
39    port = VectorPort("vector port for connecting devices")
40    bus_id = Param.Int(0, "blah")
41    clock = Param.Clock("1GHz", "bus clock speed")
42    header_cycles = Param.Int(1, "cycles of overhead per transaction")
43    width = Param.Int(64, "bus width (bytes)")
44    responder_set = Param.Bool(False, "Did the user specify a default responder.")
45    block_size = Param.Int(64, "The default block size if one isn't set by a device attached to the bus.")
46    if build_env['FULL_SYSTEM']:
47        responder = BadAddr(pio_addr=0x0, pio_latency="1ps")
48        default = Port(Self.responder.pio, "Default port for requests that aren't handled by a device.")
49    else:
50        default = Port("Default port for requests that aren't handled by a device.")
51