mm_disk.cc revision 4918:3214e3694fb2 
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->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
64    accessAddr = pkt->getAddr() - pioAddr;
65
66    sector = accessAddr / SectorSize;
67
68    if (sector != curSector) {
69        if (dirty) {
70            bytes_read = image->write(diskData, curSector);
71            assert(bytes_read == SectorSize);
72        }
73        bytes_read = image->read(diskData,  sector);
74        assert(bytes_read == SectorSize);
75        curSector = sector;
76    }
77    switch (pkt->getSize()) {
78      case sizeof(uint8_t):
79        pkt->set(diskData[accessAddr % SectorSize]);
80        DPRINTF(IdeDisk, "reading byte %#x value= %#x\n", accessAddr, diskData[accessAddr %
81                SectorSize]);
82        break;
83      case sizeof(uint16_t):
84        memcpy(&d16, diskData + (accessAddr % SectorSize), 2);
85        pkt->set(htobe(d32));
86        DPRINTF(IdeDisk, "reading word %#x value= %#x\n", accessAddr, d16);
87        break;
88      case sizeof(uint32_t):
89        memcpy(&d32, diskData + (accessAddr % SectorSize), 4);
90        pkt->set(htobe(d32));
91        DPRINTF(IdeDisk, "reading dword %#x value= %#x\n", accessAddr, d32);
92        break;
93      case sizeof(uint64_t):
94        memcpy(&d64, diskData + (accessAddr % SectorSize), 8);
95        pkt->set(htobe(d64));
96        DPRINTF(IdeDisk, "reading qword %#x value= %#x\n", accessAddr, d64);
97        break;
98      default:
99        panic("Invalid access size\n");
100    }
101
102    pkt->makeAtomicResponse();
103    return pioDelay;
104}
105
106Tick
107MmDisk::write(PacketPtr pkt)
108{
109    Addr accessAddr;
110    off_t sector;
111    off_t bytes_read;
112    uint16_t d16;
113    uint32_t d32;
114    uint64_t d64;
115
116    assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
117    accessAddr = pkt->getAddr() - pioAddr;
118
119    sector = accessAddr / SectorSize;
120
121    if (sector != curSector) {
122        if (dirty) {
123            bytes_read = image->write(diskData, curSector);
124            assert(bytes_read == SectorSize);
125        }
126        bytes_read = image->read(diskData,  sector);
127        assert(bytes_read == SectorSize);
128        curSector = sector;
129    }
130    dirty = true;
131
132    switch (pkt->getSize()) {
133      case sizeof(uint8_t):
134        diskData[accessAddr % SectorSize] = htobe(pkt->get<uint8_t>());
135        DPRINTF(IdeDisk, "writing byte %#x value= %#x\n", accessAddr, diskData[accessAddr %
136                SectorSize]);
137        break;
138      case sizeof(uint16_t):
139        d16 = htobe(pkt->get<uint16_t>());
140        memcpy(diskData + (accessAddr % SectorSize), &d16, 2);
141        DPRINTF(IdeDisk, "writing word %#x value= %#x\n", accessAddr, d16);
142        break;
143      case sizeof(uint32_t):
144        d32 = htobe(pkt->get<uint32_t>());
145        memcpy(diskData + (accessAddr % SectorSize), &d32, 4);
146        DPRINTF(IdeDisk, "writing dword %#x value= %#x\n", accessAddr, d32);
147        break;
148      case sizeof(uint64_t):
149        d64 = htobe(pkt->get<uint64_t>());
150        memcpy(diskData + (accessAddr % SectorSize), &d64, 8);
151        DPRINTF(IdeDisk, "writing qword %#x value= %#x\n", accessAddr, d64);
152        break;
153      default:
154        panic("Invalid access size\n");
155    }
156
157    pkt->makeAtomicResponse();
158    return pioDelay;
159}
160
161void
162MmDisk::serialize(std::ostream &os)
163{
164    // just write any dirty changes to the cow layer it will take care of
165    // serialization
166    int bytes_read;
167    if (dirty) {
168        bytes_read = image->write(diskData, curSector);
169        assert(bytes_read == SectorSize);
170    }
171}
172
173MmDisk *
174MmDiskParams::create()
175{
176    return new MmDisk(this);
177}
178