mm_disk.cc revision 4762:c94e103c83ad 
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 */
30
31/** @file
32 * This device acts as a disk similar to the memory mapped disk device
33 * in legion. Any access is translated to an offset in the disk image.
34 */
35
36#include <cstring>
37
38#include "base/trace.hh"
39#include "dev/sparc/mm_disk.hh"
40#include "dev/platform.hh"
41#include "mem/port.hh"
42#include "mem/packet_access.hh"
43#include "sim/byteswap.hh"
44#include "sim/system.hh"
45
46MmDisk::MmDisk(const Params *p)
47    : BasicPioDevice(p), image(p->image), curSector((off_t)-1), dirty(false)
48{
49    std::memset(&diskData, 0, SectorSize);
50    pioSize = image->size() * SectorSize;
51}
52
53Tick
54MmDisk::read(PacketPtr pkt)
55{
56    Addr accessAddr;
57    off_t sector;
58    off_t bytes_read;
59    uint16_t d16;
60    uint32_t d32;
61    uint64_t d64;
62
63    assert(pkt->result == Packet::Unknown);
64    assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
65    accessAddr = pkt->getAddr() - pioAddr;
66
67    sector = accessAddr / SectorSize;
68
69    if (sector != curSector) {
70        if (dirty) {
71            bytes_read = image->write(diskData, curSector);
72            assert(bytes_read == SectorSize);
73        }
74        bytes_read = image->read(diskData,  sector);
75        assert(bytes_read == SectorSize);
76        curSector = sector;
77    }
78    switch (pkt->getSize()) {
79      case sizeof(uint8_t):
80        pkt->set(diskData[accessAddr % SectorSize]);
81        DPRINTF(IdeDisk, "reading byte %#x value= %#x\n", accessAddr, diskData[accessAddr %
82                SectorSize]);
83        break;
84      case sizeof(uint16_t):
85        memcpy(&d16, diskData + (accessAddr % SectorSize), 2);
86        pkt->set(htobe(d32));
87        DPRINTF(IdeDisk, "reading word %#x value= %#x\n", accessAddr, d16);
88        break;
89      case sizeof(uint32_t):
90        memcpy(&d32, diskData + (accessAddr % SectorSize), 4);
91        pkt->set(htobe(d32));
92        DPRINTF(IdeDisk, "reading dword %#x value= %#x\n", accessAddr, d32);
93        break;
94      case sizeof(uint64_t):
95        memcpy(&d64, diskData + (accessAddr % SectorSize), 8);
96        pkt->set(htobe(d64));
97        DPRINTF(IdeDisk, "reading qword %#x value= %#x\n", accessAddr, d64);
98        break;
99      default:
100        panic("Invalid access size\n");
101    }
102
103    pkt->result = Packet::Success;
104    return pioDelay;
105}
106
107Tick
108MmDisk::write(PacketPtr pkt)
109{
110    Addr accessAddr;
111    off_t sector;
112    off_t bytes_read;
113    uint16_t d16;
114    uint32_t d32;
115    uint64_t d64;
116
117    assert(pkt->result == Packet::Unknown);
118    assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
119    accessAddr = pkt->getAddr() - pioAddr;
120
121    sector = accessAddr / SectorSize;
122
123    if (sector != curSector) {
124        if (dirty) {
125            bytes_read = image->write(diskData, curSector);
126            assert(bytes_read == SectorSize);
127        }
128        bytes_read = image->read(diskData,  sector);
129        assert(bytes_read == SectorSize);
130        curSector = sector;
131    }
132    dirty = true;
133
134    switch (pkt->getSize()) {
135      case sizeof(uint8_t):
136        diskData[accessAddr % SectorSize] = htobe(pkt->get<uint8_t>());
137        DPRINTF(IdeDisk, "writing byte %#x value= %#x\n", accessAddr, diskData[accessAddr %
138                SectorSize]);
139        break;
140      case sizeof(uint16_t):
141        d16 = htobe(pkt->get<uint16_t>());
142        memcpy(diskData + (accessAddr % SectorSize), &d16, 2);
143        DPRINTF(IdeDisk, "writing word %#x value= %#x\n", accessAddr, d16);
144        break;
145      case sizeof(uint32_t):
146        d32 = htobe(pkt->get<uint32_t>());
147        memcpy(diskData + (accessAddr % SectorSize), &d32, 4);
148        DPRINTF(IdeDisk, "writing dword %#x value= %#x\n", accessAddr, d32);
149        break;
150      case sizeof(uint64_t):
151        d64 = htobe(pkt->get<uint64_t>());
152        memcpy(diskData + (accessAddr % SectorSize), &d64, 8);
153        DPRINTF(IdeDisk, "writing qword %#x value= %#x\n", accessAddr, d64);
154        break;
155      default:
156        panic("Invalid access size\n");
157    }
158
159    pkt->result = Packet::Success;
160    return pioDelay;
161}
162
163void
164MmDisk::serialize(std::ostream &os)
165{
166    // just write any dirty changes to the cow layer it will take care of
167    // serialization
168    int bytes_read;
169    if (dirty) {
170        bytes_read = image->write(diskData, curSector);
171        assert(bytes_read == SectorSize);
172    }
173}
174
175MmDisk *
176MmDiskParams::create()
177{
178    return new MmDisk(this);
179}
180