mm_disk.cc revision 9808:13ffc0066b76
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 "debug/IdeDisk.hh" 40#include "dev/sparc/mm_disk.hh" 41#include "dev/platform.hh" 42#include "mem/packet_access.hh" 43#include "mem/port.hh" 44#include "sim/byteswap.hh" 45#include "sim/system.hh" 46 47MmDisk::MmDisk(const Params *p) 48 : BasicPioDevice(p, p->image->size() * SectorSize), 49 image(p->image), curSector((off_t)-1), dirty(false) 50{ 51 std::memset(&diskData, 0, SectorSize); 52} 53 54Tick 55MmDisk::read(PacketPtr pkt) 56{ 57 Addr accessAddr; 58 off_t sector; 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#ifndef NDEBUG 71 off_t bytes_written = 72#endif 73 image->write(diskData, curSector); 74 assert(bytes_written == SectorSize); 75 } 76#ifndef NDEBUG 77 off_t bytes_read = 78#endif 79 image->read(diskData, sector); 80 assert(bytes_read == SectorSize); 81 curSector = sector; 82 } 83 switch (pkt->getSize()) { 84 case sizeof(uint8_t): 85 pkt->set(diskData[accessAddr % SectorSize]); 86 DPRINTF(IdeDisk, "reading byte %#x value= %#x\n", accessAddr, diskData[accessAddr % 87 SectorSize]); 88 break; 89 case sizeof(uint16_t): 90 memcpy(&d16, diskData + (accessAddr % SectorSize), 2); 91 pkt->set(htobe(d16)); 92 DPRINTF(IdeDisk, "reading word %#x value= %#x\n", accessAddr, d16); 93 break; 94 case sizeof(uint32_t): 95 memcpy(&d32, diskData + (accessAddr % SectorSize), 4); 96 pkt->set(htobe(d32)); 97 DPRINTF(IdeDisk, "reading dword %#x value= %#x\n", accessAddr, d32); 98 break; 99 case sizeof(uint64_t): 100 memcpy(&d64, diskData + (accessAddr % SectorSize), 8); 101 pkt->set(htobe(d64)); 102 DPRINTF(IdeDisk, "reading qword %#x value= %#x\n", accessAddr, d64); 103 break; 104 default: 105 panic("Invalid access size\n"); 106 } 107 108 pkt->makeAtomicResponse(); 109 return pioDelay; 110} 111 112Tick 113MmDisk::write(PacketPtr pkt) 114{ 115 Addr accessAddr; 116 off_t sector; 117 uint16_t d16; 118 uint32_t d32; 119 uint64_t d64; 120 121 assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize); 122 accessAddr = pkt->getAddr() - pioAddr; 123 124 sector = accessAddr / SectorSize; 125 126 if (sector != curSector) { 127 if (dirty) { 128#ifndef NDEBUG 129 off_t bytes_written = 130#endif 131 image->write(diskData, curSector); 132 assert(bytes_written == SectorSize); 133 } 134#ifndef NDEBUG 135 off_t bytes_read = 136#endif 137 image->read(diskData, sector); 138 assert(bytes_read == SectorSize); 139 curSector = sector; 140 } 141 dirty = true; 142 143 switch (pkt->getSize()) { 144 case sizeof(uint8_t): 145 diskData[accessAddr % SectorSize] = htobe(pkt->get<uint8_t>()); 146 DPRINTF(IdeDisk, "writing byte %#x value= %#x\n", accessAddr, diskData[accessAddr % 147 SectorSize]); 148 break; 149 case sizeof(uint16_t): 150 d16 = htobe(pkt->get<uint16_t>()); 151 memcpy(diskData + (accessAddr % SectorSize), &d16, 2); 152 DPRINTF(IdeDisk, "writing word %#x value= %#x\n", accessAddr, d16); 153 break; 154 case sizeof(uint32_t): 155 d32 = htobe(pkt->get<uint32_t>()); 156 memcpy(diskData + (accessAddr % SectorSize), &d32, 4); 157 DPRINTF(IdeDisk, "writing dword %#x value= %#x\n", accessAddr, d32); 158 break; 159 case sizeof(uint64_t): 160 d64 = htobe(pkt->get<uint64_t>()); 161 memcpy(diskData + (accessAddr % SectorSize), &d64, 8); 162 DPRINTF(IdeDisk, "writing qword %#x value= %#x\n", accessAddr, d64); 163 break; 164 default: 165 panic("Invalid access size\n"); 166 } 167 168 pkt->makeAtomicResponse(); 169 return pioDelay; 170} 171 172void 173MmDisk::serialize(std::ostream &os) 174{ 175 // just write any dirty changes to the cow layer it will take care of 176 // serialization 177 if (dirty) { 178#ifndef NDEBUG 179 int bytes_read = 180#endif 181 image->write(diskData, curSector); 182 assert(bytes_read == SectorSize); 183 } 184} 185 186MmDisk * 187MmDiskParams::create() 188{ 189 return new MmDisk(this); 190} 191