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