xbar.cc revision 2534 
1/*
2 * Copyright (c) 2006 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/**
30 * @file Definition of a bus object.
31 */
32
33
34#include "bus.hh"
35#include "sim/builder.hh"
36
37/** Function called by the port when the bus is recieving a Timing
38 * transaction.*/
39bool
40Bus::recvTiming(Packet &pkt, int id)
41{
42
43    panic("I need to be implemented, but not right now.");
44}
45
46Port *
47Bus::findPort(Addr addr, int id)
48{
49    /* An interval tree would be a better way to do this. --ali. */
50    int dest_id = -1;
51    int i = 0;
52    bool found = false;
53
54    while (i < portList.size() && !found)
55    {
56        if (portList[i].range == addr) {
57            dest_id = portList[i].portId;
58            found = true;
59        }
60    }
61    assert(dest_id != -1 && "Unable to find destination");
62    // we shouldn't be sending this back to where it came from
63    assert(dest_id != id);
64
65    return interfaces[dest_id];
66}
67
68/** Function called by the port when the bus is recieving a Atomic
69 * transaction.*/
70Tick
71Bus::recvAtomic(Packet &pkt, int id)
72{
73    return findPort(pkt.addr, id)->sendAtomic(pkt);
74}
75
76/** Function called by the port when the bus is recieving a Functional
77 * transaction.*/
78void
79Bus::recvFunctional(Packet &pkt, int id)
80{
81    findPort(pkt.addr, id)->sendFunctional(pkt);
82}
83
84/** Function called by the port when the bus is recieving a status change.*/
85void
86Bus::recvStatusChange(Port::Status status, int id)
87{
88    assert(status == Port::RangeChange &&
89           "The other statuses need to be implemented.");
90
91    assert(id < interfaces.size() && id >= 0);
92    Port *port = interfaces[id];
93    AddrRangeList ranges;
94    AddrRangeList snoops;
95
96    port->getPeerAddressRanges(ranges, snoops);
97
98    // not dealing with snooping yet either
99    assert(snoops.size() == 0);
100    // or multiple ranges
101    assert(ranges.size() == 1);
102    DevMap dm;
103    dm.portId = id;
104    dm.range = ranges.front();
105
106    portList.push_back(dm);
107}
108
109void
110Bus::BusPort::addressRanges(AddrRangeList &resp, AddrRangeList &snoop)
111{
112    panic("I'm not implemented.\n");
113}
114
115BEGIN_DECLARE_SIM_OBJECT_PARAMS(Bus)
116
117    Param<int> bus_id;
118
119END_DECLARE_SIM_OBJECT_PARAMS(Bus)
120
121BEGIN_INIT_SIM_OBJECT_PARAMS(Bus)
122    INIT_PARAM(bus_id, "junk bus id")
123END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
124
125CREATE_SIM_OBJECT(Bus)
126{
127    return new Bus(getInstanceName());
128}
129
130REGISTER_SIM_OBJECT("Bus", Bus)
131