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
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42#include "dev/platform.hh"
43#include "mem/packet_access.hh"
44#include "mem/port.hh"
45#include "sim/byteswap.hh"
46#include "sim/system.hh"
47
48MmDisk::MmDisk(const Params *p)
49 : BasicPioDevice(p, p->image->size() * SectorSize),
50 image(p->image), curSector((off_t)-1), dirty(false)
51{
52 std::memset(&diskData, 0, SectorSize);
53}
54
55Tick
56MmDisk::read(PacketPtr pkt)
57{
58 Addr accessAddr;
59 off_t sector;
60 uint16_t d16;
61 uint32_t d32;
62 uint64_t d64;
63
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#ifndef NDEBUG
72 off_t bytes_written =
73#endif
74 image->write(diskData, curSector);
75 assert(bytes_written == SectorSize);
76 }
77#ifndef NDEBUG
78 off_t bytes_read =
79#endif
80 image->read(diskData, sector);
81 assert(bytes_read == SectorSize);
82 curSector = sector;
83 }
84 switch (pkt->getSize()) {
85 case sizeof(uint8_t):
86 pkt->set(diskData[accessAddr % SectorSize]);
87 DPRINTF(IdeDisk, "reading byte %#x value= %#x\n", accessAddr, diskData[accessAddr %
88 SectorSize]);
89 break;
90 case sizeof(uint16_t):
91 memcpy(&d16, diskData + (accessAddr % SectorSize), 2);
92 pkt->set(htobe(d16));
93 DPRINTF(IdeDisk, "reading word %#x value= %#x\n", accessAddr, d16);
94 break;
95 case sizeof(uint32_t):
96 memcpy(&d32, diskData + (accessAddr % SectorSize), 4);
97 pkt->set(htobe(d32));
98 DPRINTF(IdeDisk, "reading dword %#x value= %#x\n", accessAddr, d32);
99 break;
100 case sizeof(uint64_t):
101 memcpy(&d64, diskData + (accessAddr % SectorSize), 8);
102 pkt->set(htobe(d64));
103 DPRINTF(IdeDisk, "reading qword %#x value= %#x\n", accessAddr, d64);
104 break;
105 default:
106 panic("Invalid access size\n");
107 }
108
109 pkt->makeAtomicResponse();
110 return pioDelay;
111}
112
113Tick
114MmDisk::write(PacketPtr pkt)
115{
116 Addr accessAddr;
117 off_t sector;
118 uint16_t d16;
119 uint32_t d32;
120 uint64_t d64;
121
122 assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
123 accessAddr = pkt->getAddr() - pioAddr;
124
125 sector = accessAddr / SectorSize;
126
127 if (sector != curSector) {
128 if (dirty) {
129#ifndef NDEBUG
130 off_t bytes_written =
131#endif
132 image->write(diskData, curSector);
133 assert(bytes_written == SectorSize);
134 }
135#ifndef NDEBUG
136 off_t bytes_read =
137#endif
138 image->read(diskData, sector);
139 assert(bytes_read == SectorSize);
140 curSector = sector;
141 }
142 dirty = true;
143
144 switch (pkt->getSize()) {
145 case sizeof(uint8_t):
146 diskData[accessAddr % SectorSize] = htobe(pkt->get<uint8_t>());
147 DPRINTF(IdeDisk, "writing byte %#x value= %#x\n", accessAddr, diskData[accessAddr %
148 SectorSize]);
149 break;
150 case sizeof(uint16_t):
151 d16 = htobe(pkt->get<uint16_t>());
152 memcpy(diskData + (accessAddr % SectorSize), &d16, 2);
153 DPRINTF(IdeDisk, "writing word %#x value= %#x\n", accessAddr, d16);
154 break;
155 case sizeof(uint32_t):
156 d32 = htobe(pkt->get<uint32_t>());
157 memcpy(diskData + (accessAddr % SectorSize), &d32, 4);
158 DPRINTF(IdeDisk, "writing dword %#x value= %#x\n", accessAddr, d32);
159 break;
160 case sizeof(uint64_t):
161 d64 = htobe(pkt->get<uint64_t>());
162 memcpy(diskData + (accessAddr % SectorSize), &d64, 8);
163 DPRINTF(IdeDisk, "writing qword %#x value= %#x\n", accessAddr, d64);
164 break;
165 default:
166 panic("Invalid access size\n");
167 }
168
169 pkt->makeAtomicResponse();
170 return pioDelay;
171}
172
173void
174MmDisk::serialize(CheckpointOut &cp) const
175{
176 // just write any dirty changes to the cow layer it will take care of
177 // serialization
178 if (dirty) {
179#ifndef NDEBUG
180 int bytes_read =
181#endif
182 image->write(diskData, curSector);
183 assert(bytes_read == SectorSize);
184 }
185}
186
187MmDisk *
188MmDiskParams::create()
189{
190 return new MmDisk(this);
191}
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