abstract_mem.cc revision 2914
1/* 2 * Copyright (c) 2001-2005 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: Ron Dreslinski 29 * Ali Saidi 30 */ 31 32#include <sys/types.h> 33#include <sys/mman.h> 34#include <errno.h> 35#include <fcntl.h> 36#include <unistd.h> 37#include <zlib.h> 38 39#include <iostream> 40#include <string> 41 42 43#include "base/misc.hh" 44#include "config/full_system.hh" 45#include "mem/packet_impl.hh" 46#include "mem/physical.hh" 47#include "sim/host.hh" 48#include "sim/builder.hh" 49#include "sim/eventq.hh" 50#include "arch/isa_traits.hh" 51 52 53using namespace std; 54using namespace TheISA; 55 56 57PhysicalMemory::PhysicalMemory(const string &n, Tick latency) 58 : MemObject(n),base_addr(0), pmem_addr(NULL), port(NULL), lat(latency) 59{ 60 // Hardcoded to 128 MB for now. 61 pmem_size = 1 << 27; 62 63 if (pmem_size % TheISA::PageBytes != 0) 64 panic("Memory Size not divisible by page size\n"); 65 66 int map_flags = MAP_ANON | MAP_PRIVATE; 67 pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE, 68 map_flags, -1, 0); 69 70 if (pmem_addr == (void *)MAP_FAILED) { 71 perror("mmap"); 72 fatal("Could not mmap!\n"); 73 } 74 75 page_ptr = 0; 76} 77 78void 79PhysicalMemory::init() 80{ 81 if (!port) 82 panic("PhysicalMemory not connected to anything!"); 83 port->sendStatusChange(Port::RangeChange); 84} 85 86PhysicalMemory::~PhysicalMemory() 87{ 88 if (pmem_addr) 89 munmap(pmem_addr, pmem_size); 90 //Remove memPorts? 91} 92 93Addr 94PhysicalMemory::new_page() 95{ 96 Addr return_addr = page_ptr << LogVMPageSize; 97 return_addr += base_addr; 98 99 ++page_ptr; 100 return return_addr; 101} 102 103int 104PhysicalMemory::deviceBlockSize() 105{ 106 //Can accept anysize request 107 return 0; 108} 109 110 111Tick 112PhysicalMemory::doFunctionalAccess(Packet *pkt) 113{ 114 assert(pkt->getAddr() + pkt->getSize() < pmem_size); 115 116 switch (pkt->cmd) { 117 case Packet::ReadReq: 118 memcpy(pkt->getPtr<uint8_t>(), 119 pmem_addr + pkt->getAddr() - base_addr, 120 pkt->getSize()); 121 break; 122 case Packet::WriteReq: 123 memcpy(pmem_addr + pkt->getAddr() - base_addr, 124 pkt->getPtr<uint8_t>(), 125 pkt->getSize()); 126 // temporary hack: will need to add real LL/SC implementation 127 // for cacheless systems later. 128 if (pkt->req->getFlags() & LOCKED) { 129 pkt->req->setScResult(1); 130 } 131 break; 132 default: 133 panic("unimplemented"); 134 } 135 136 pkt->result = Packet::Success; 137 return lat; 138} 139 140Port * 141PhysicalMemory::getPort(const std::string &if_name, int idx) 142{ 143 if (if_name == "port" && idx == -1) { 144 if (port != NULL) 145 panic("PhysicalMemory::getPort: additional port requested to memory!"); 146 port = new MemoryPort(name() + "-port", this); 147 return port; 148 } else if (if_name == "functional") { 149 /* special port for functional writes at startup. */ 150 return new MemoryPort(name() + "-funcport", this); 151 } else { 152 panic("PhysicalMemory::getPort: unknown port %s requested", if_name); 153 } 154} 155 156void 157PhysicalMemory::recvStatusChange(Port::Status status) 158{ 159} 160 161PhysicalMemory::MemoryPort::MemoryPort(const std::string &_name, 162 PhysicalMemory *_memory) 163 : SimpleTimingPort(_name), memory(_memory) 164{ } 165 166void 167PhysicalMemory::MemoryPort::recvStatusChange(Port::Status status) 168{ 169 memory->recvStatusChange(status); 170} 171 172void 173PhysicalMemory::MemoryPort::getDeviceAddressRanges(AddrRangeList &resp, 174 AddrRangeList &snoop) 175{ 176 memory->getAddressRanges(resp, snoop); 177} 178 179void 180PhysicalMemory::getAddressRanges(AddrRangeList &resp, AddrRangeList &snoop) 181{ 182 snoop.clear(); 183 resp.clear(); 184 resp.push_back(RangeSize(base_addr, pmem_size)); 185} 186 187int 188PhysicalMemory::MemoryPort::deviceBlockSize() 189{ 190 return memory->deviceBlockSize(); 191} 192 193bool 194PhysicalMemory::MemoryPort::recvTiming(Packet *pkt) 195{ 196 assert(pkt->result != Packet::Nacked); 197 198 Tick latency = memory->doFunctionalAccess(pkt); 199 200 pkt->makeTimingResponse(); 201 sendTiming(pkt, latency); 202 203 return true; 204} 205 206Tick 207PhysicalMemory::MemoryPort::recvAtomic(Packet *pkt) 208{ 209 return memory->doFunctionalAccess(pkt); 210} 211 212void 213PhysicalMemory::MemoryPort::recvFunctional(Packet *pkt) 214{ 215 memory->doFunctionalAccess(pkt); 216} 217 218unsigned int 219PhysicalMemory::drain(Event *de) 220{ 221 int count = port->drain(de); 222 if (count) 223 changeState(Draining); 224 else 225 changeState(Drained); 226 return count; 227} 228 229void 230PhysicalMemory::serialize(ostream &os) 231{ 232 gzFile compressedMem; 233 string filename = name() + ".physmem"; 234 235 SERIALIZE_SCALAR(pmem_size); 236 SERIALIZE_SCALAR(filename); 237 238 // write memory file 239 string thefile = Checkpoint::dir() + "/" + filename.c_str(); 240 int fd = creat(thefile.c_str(), 0664); 241 if (fd < 0) { 242 perror("creat"); 243 fatal("Can't open physical memory checkpoint file '%s'\n", filename); 244 } 245 246 compressedMem = gzdopen(fd, "wb"); 247 if (compressedMem == NULL) 248 fatal("Insufficient memory to allocate compression state for %s\n", 249 filename); 250 251 if (gzwrite(compressedMem, pmem_addr, pmem_size) != pmem_size) { 252 fatal("Write failed on physical memory checkpoint file '%s'\n", 253 filename); 254 } 255 256 if (gzclose(compressedMem)) 257 fatal("Close failed on physical memory checkpoint file '%s'\n", 258 filename); 259} 260 261void 262PhysicalMemory::unserialize(Checkpoint *cp, const string §ion) 263{ 264 gzFile compressedMem; 265 long *tempPage; 266 long *pmem_current; 267 uint64_t curSize; 268 uint32_t bytesRead; 269 const int chunkSize = 16384; 270 271 272 // unmap file that was mmaped in the constructor 273 munmap(pmem_addr, pmem_size); 274 275 string filename; 276 277 UNSERIALIZE_SCALAR(pmem_size); 278 UNSERIALIZE_SCALAR(filename); 279 280 filename = cp->cptDir + "/" + filename; 281 282 // mmap memoryfile 283 int fd = open(filename.c_str(), O_RDONLY); 284 if (fd < 0) { 285 perror("open"); 286 fatal("Can't open physical memory checkpoint file '%s'", filename); 287 } 288 289 compressedMem = gzdopen(fd, "rb"); 290 if (compressedMem == NULL) 291 fatal("Insufficient memory to allocate compression state for %s\n", 292 filename); 293 294 295 pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE, 296 MAP_ANON | MAP_PRIVATE, -1, 0); 297 298 if (pmem_addr == (void *)MAP_FAILED) { 299 perror("mmap"); 300 fatal("Could not mmap physical memory!\n"); 301 } 302 303 curSize = 0; 304 tempPage = (long*)malloc(chunkSize); 305 if (tempPage == NULL) 306 fatal("Unable to malloc memory to read file %s\n", filename); 307 308 /* Only copy bytes that are non-zero, so we don't give the VM system hell */ 309 while (curSize < pmem_size) { 310 bytesRead = gzread(compressedMem, tempPage, chunkSize); 311 if (bytesRead != chunkSize && bytesRead != pmem_size - curSize) 312 fatal("Read failed on physical memory checkpoint file '%s'" 313 " got %d bytes, expected %d or %d bytes\n", 314 filename, bytesRead, chunkSize, pmem_size-curSize); 315 316 assert(bytesRead % sizeof(long) == 0); 317 318 for (int x = 0; x < bytesRead/sizeof(long); x++) 319 { 320 if (*(tempPage+x) != 0) { 321 pmem_current = (long*)(pmem_addr + curSize + x * sizeof(long)); 322 *pmem_current = *(tempPage+x); 323 } 324 } 325 curSize += bytesRead; 326 } 327 328 free(tempPage); 329 330 if (gzclose(compressedMem)) 331 fatal("Close failed on physical memory checkpoint file '%s'\n", 332 filename); 333 334} 335 336 337BEGIN_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory) 338 339 Param<string> file; 340 Param<Range<Addr> > range; 341 Param<Tick> latency; 342 343END_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory) 344 345BEGIN_INIT_SIM_OBJECT_PARAMS(PhysicalMemory) 346 347 INIT_PARAM_DFLT(file, "memory mapped file", ""), 348 INIT_PARAM(range, "Device Address Range"), 349 INIT_PARAM(latency, "Memory access latency") 350 351END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory) 352 353CREATE_SIM_OBJECT(PhysicalMemory) 354{ 355 356 return new PhysicalMemory(getInstanceName(), latency); 357} 358 359REGISTER_SIM_OBJECT("PhysicalMemory", PhysicalMemory) 360