packet.cc revision 3242:46cbc3bd6564 
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 * Authors: Ali Saidi
29 *          Steve Reinhardt
30 */
31
32/**
33 * @file
34 * Definition of the Packet Class, a packet is a transaction occuring
35 * between a single level of the memory heirarchy (ie L1->L2).
36 */
37#include "base/misc.hh"
38#include "mem/packet.hh"
39
40static const std::string ReadReqString("ReadReq");
41static const std::string WriteReqString("WriteReq");
42static const std::string WriteReqNoAckString("WriteReqNoAck");
43static const std::string ReadRespString("ReadResp");
44static const std::string WriteRespString("WriteResp");
45static const std::string OtherCmdString("<other>");
46
47const std::string &
48Packet::cmdString() const
49{
50    switch (cmd) {
51      case ReadReq:         return ReadReqString;
52      case WriteReq:        return WriteReqString;
53      case WriteReqNoAck:   return WriteReqNoAckString;
54      case ReadResp:        return ReadRespString;
55      case WriteResp:       return WriteRespString;
56      default:              return OtherCmdString;
57    }
58}
59
60const std::string &
61Packet::cmdIdxToString(Packet::Command idx)
62{
63    switch (idx) {
64      case ReadReq:         return ReadReqString;
65      case WriteReq:        return WriteReqString;
66      case WriteReqNoAck:   return WriteReqNoAckString;
67      case ReadResp:        return ReadRespString;
68      case WriteResp:       return WriteRespString;
69      default:              return OtherCmdString;
70    }
71}
72
73/** delete the data pointed to in the data pointer. Ok to call to matter how
74 * data was allocted. */
75void
76Packet::deleteData()
77{
78    assert(staticData || dynamicData);
79    if (staticData)
80        return;
81
82    if (arrayData)
83        delete [] data;
84    else
85        delete data;
86}
87
88/** If there isn't data in the packet, allocate some. */
89void
90Packet::allocate()
91{
92    if (data)
93        return;
94    assert(!staticData);
95    dynamicData = true;
96    arrayData = true;
97    data = new uint8_t[getSize()];
98}
99
100/** Do the packet modify the same addresses. */
101bool
102Packet::intersect(Packet *p)
103{
104    Addr s1 = getAddr();
105    Addr e1 = getAddr() + getSize() - 1;
106    Addr s2 = p->getAddr();
107    Addr e2 = p->getAddr() + p->getSize() - 1;
108
109    return !(s1 > e2 || e1 < s2);
110}
111
112bool
113fixPacket(Packet *func, Packet *timing)
114{
115    panic("Need to implement!");
116}
117