xbar.cc revision 2548 
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 "base/trace.hh"
35#include "mem/bus.hh"
36#include "sim/builder.hh"
37
38/** Function called by the port when the bus is recieving a Timing
39 * transaction.*/
40bool
41Bus::recvTiming(Packet &pkt, int id)
42{
43
44    panic("I need to be implemented, but not right now.");
45}
46
47Port *
48Bus::findPort(Addr addr, int id)
49{
50    /* An interval tree would be a better way to do this. --ali. */
51    int dest_id = -1;
52    int i = 0;
53    bool found = false;
54
55    while (i < portList.size() && !found)
56    {
57        if (portList[i].range == addr) {
58            dest_id = portList[i].portId;
59            found = true;
60        }
61        i++;
62    }
63    if (dest_id == -1)
64        panic("Unable to find destination for addr: %llx", addr);
65
66    // we shouldn't be sending this back to where it came from
67    assert(dest_id != id);
68
69    return interfaces[dest_id];
70}
71
72/** Function called by the port when the bus is recieving a Atomic
73 * transaction.*/
74Tick
75Bus::recvAtomic(Packet &pkt, int id)
76{
77    return findPort(pkt.addr, id)->sendAtomic(pkt);
78}
79
80/** Function called by the port when the bus is recieving a Functional
81 * transaction.*/
82void
83Bus::recvFunctional(Packet &pkt, int id)
84{
85    findPort(pkt.addr, id)->sendFunctional(pkt);
86}
87
88/** Function called by the port when the bus is recieving a status change.*/
89void
90Bus::recvStatusChange(Port::Status status, int id)
91{
92    assert(status == Port::RangeChange &&
93           "The other statuses need to be implemented.");
94
95    assert(id < interfaces.size() && id >= 0);
96    Port *port = interfaces[id];
97    AddrRangeList ranges;
98    AddrRangeList snoops;
99
100    port->getPeerAddressRanges(ranges, snoops);
101
102    // not dealing with snooping yet either
103    assert(snoops.size() == 0);
104    // or multiple ranges
105    assert(ranges.size() == 1);
106
107    DevMap dm;
108    dm.portId = id;
109    dm.range = ranges.front();
110
111    DPRINTF(MMU, "Adding range %llx - %llx for id %d\n", dm.range.start,
112            dm.range.end, id);
113    portList.push_back(dm);
114    DPRINTF(MMU, "port list has %d entries\n", portList.size());
115}
116
117void
118Bus::BusPort::addressRanges(AddrRangeList &resp, AddrRangeList &snoop)
119{
120    panic("I'm not implemented.\n");
121}
122
123BEGIN_DECLARE_SIM_OBJECT_PARAMS(Bus)
124
125    Param<int> bus_id;
126
127END_DECLARE_SIM_OBJECT_PARAMS(Bus)
128
129BEGIN_INIT_SIM_OBJECT_PARAMS(Bus)
130    INIT_PARAM(bus_id, "junk bus id")
131END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
132
133CREATE_SIM_OBJECT(Bus)
134{
135    return new Bus(getInstanceName());
136}
137
138REGISTER_SIM_OBJECT("Bus", Bus)
139