summaryrefslogtreecommitdiff
path: root/src/mem/bus.cc
blob: f7c2b874ac0f272e9beb3fc1920aeb823e0eb7d3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
/*
 * Copyright (c) 2006 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @file Definition of a bus object.
 */


#include "base/trace.hh"
#include "mem/bus.hh"
#include "sim/builder.hh"

/** Get the ranges of anyone that we are connected to. */
void
Bus::init()
{
    std::vector<Port*>::iterator intIter;
    for (intIter = interfaces.begin(); intIter != interfaces.end(); intIter++)
        (*intIter)->sendStatusChange(Port::RangeChange);
}


/** Function called by the port when the bus is recieving a Timing
 * transaction.*/
bool
Bus::recvTiming(Packet *pkt)
{
    Port *port;
    if (pkt->dest == Packet::Broadcast) {
        port = findPort(pkt->addr, pkt->src);
    } else {
        assert(pkt->dest > 0 && pkt->dest < interfaces.size());
        port = interfaces[pkt->dest];
    }
    return port->sendTiming(pkt);
}

Port *
Bus::findPort(Addr addr, int id)
{
    /* An interval tree would be a better way to do this. --ali. */
    int dest_id = -1;
    int i = 0;
    bool found = false;

    while (i < portList.size() && !found)
    {
        if (portList[i].range == addr) {
            dest_id = portList[i].portId;
            found = true;
            DPRINTF(Bus, "Found Addr: %llx on device %d\n", addr, dest_id);
        }
        i++;
    }
    if (dest_id == -1)
        panic("Unable to find destination for addr: %llx", addr);

    // we shouldn't be sending this back to where it came from
    assert(dest_id != id);

    return interfaces[dest_id];
}

/** Function called by the port when the bus is recieving a Atomic
 * transaction.*/
Tick
Bus::recvAtomic(Packet *pkt)
{
    assert(pkt->dest == Packet::Broadcast);
    return findPort(pkt->addr, pkt->src)->sendAtomic(pkt);
}

/** Function called by the port when the bus is recieving a Functional
 * transaction.*/
void
Bus::recvFunctional(Packet *pkt)
{
    assert(pkt->dest == Packet::Broadcast);
    findPort(pkt->addr, pkt->src)->sendFunctional(pkt);
}

/** Function called by the port when the bus is recieving a status change.*/
void
Bus::recvStatusChange(Port::Status status, int id)
{
    DPRINTF(Bus, "Bus %d recieved status change from device id %d\n",
            busId, id);
    assert(status == Port::RangeChange &&
           "The other statuses need to be implemented.");

    assert(id < interfaces.size() && id >= 0);
    int x;
    Port *port = interfaces[id];
    AddrRangeList ranges;
    AddrRangeList snoops;
    AddrRangeIter iter;
    std::vector<DevMap>::iterator portIter;

    // Clean out any previously existent ids
    for (portIter = portList.begin(); portIter != portList.end(); ) {
        if (portIter->portId == id)
            portIter = portList.erase(portIter);
        else
            portIter++;
    }

    port->getPeerAddressRanges(ranges, snoops);

    // not dealing with snooping yet either
    assert(snoops.size() == 0);
    for(iter = ranges.begin(); iter != ranges.end(); iter++) {
        DevMap dm;
        dm.portId = id;
        dm.range = *iter;

        DPRINTF(MMU, "Adding range %llx - %llx for id %d\n", dm.range.start,
                dm.range.end, id);
        portList.push_back(dm);
    }
    DPRINTF(MMU, "port list has %d entries\n", portList.size());

    // tell all our peers that our address range has changed.
    // Don't tell the device that caused this change, it already knows
    for (x = 0; x < interfaces.size(); x++)
        if (x != id)
            interfaces[x]->sendStatusChange(Port::RangeChange);
}

void
Bus::addressRanges(AddrRangeList &resp, AddrRangeList &snoop, int id)
{
    std::vector<DevMap>::iterator portIter;

    resp.clear();
    snoop.clear();

    DPRINTF(Bus, "Bus id %d recieved address range request returning\n",
            busId);
    for (portIter = portList.begin(); portIter != portList.end(); portIter++) {
        if (portIter->portId != id) {
            resp.push_back(portIter->range);
            DPRINTF(Bus, "-- %#llX : %#llX\n", portIter->range.start,
                    portIter->range.end);
        }
    }
}

BEGIN_DECLARE_SIM_OBJECT_PARAMS(Bus)

    Param<int> bus_id;

END_DECLARE_SIM_OBJECT_PARAMS(Bus)

BEGIN_INIT_SIM_OBJECT_PARAMS(Bus)
    INIT_PARAM(bus_id, "a globally unique bus id")
END_INIT_SIM_OBJECT_PARAMS(Bus)

CREATE_SIM_OBJECT(Bus)
{
    return new Bus(getInstanceName(), bus_id);
}

REGISTER_SIM_OBJECT("Bus", Bus)