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