abstract_mem.cc revision 2413
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 29#include <sys/types.h> 30#include <sys/mman.h> 31#include <errno.h> 32#include <fcntl.h> 33#include <unistd.h> 34#include <zlib.h> 35 36#include <cstdio> 37#include <iostream> 38#include <string> 39 40 41#include "base/misc.hh" 42#include "config/full_system.hh" 43#if FULL_SYSTEM 44#include "mem/functional/memory_control.hh" 45#endif 46#include "mem/physical.hh" 47#include "sim/host.hh" 48#include "sim/builder.hh" 49#include "targetarch/isa_traits.hh" 50 51 52using namespace std; 53 54#if FULL_SYSTEM 55PhysicalMemory::PhysicalMemory(const string &n, Range<Addr> range, 56 MemoryController *mmu, const std::string &fname) 57 : Memory(n), base_addr(range.start), pmem_size(range.size()), 58 pmem_addr(NULL) 59{ 60 if (pmem_size % TheISA::PageBytes != 0) 61 panic("Memory Size not divisible by page size\n"); 62 63 mmu->add_child(this, range); 64 65 int fd = -1; 66 67 if (!fname.empty()) { 68 fd = open(fname.c_str(), O_RDWR | O_CREAT, 0644); 69 if (fd == -1) { 70 perror("open"); 71 fatal("Could not open physical memory file: %s\n", fname); 72 } 73 ftruncate(fd, pmem_size); 74 } 75 76 int map_flags = (fd == -1) ? (MAP_ANON | MAP_PRIVATE) : MAP_SHARED; 77 pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE, 78 map_flags, fd, 0); 79 80 if (fd != -1) 81 close(fd); 82 83 if (pmem_addr == (void *)MAP_FAILED) { 84 perror("mmap"); 85 fatal("Could not mmap!\n"); 86 } 87 88 page_ptr = 0; 89} 90#endif 91 92PhysicalMemory::PhysicalMemory(const string &n) 93 : Memory(n), memoryPort(this), base_addr(0), pmem_addr(NULL) 94{ 95 // Hardcoded to 128 MB for now. 96 pmem_size = 1 << 27; 97 98 if (pmem_size % TheISA::PageBytes != 0) 99 panic("Memory Size not divisible by page size\n"); 100 101 int map_flags = MAP_ANON | MAP_PRIVATE; 102 pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE, 103 map_flags, -1, 0); 104 105 if (pmem_addr == (void *)MAP_FAILED) { 106 perror("mmap"); 107 fatal("Could not mmap!\n"); 108 } 109 110 page_ptr = 0; 111} 112 113PhysicalMemory::~PhysicalMemory() 114{ 115 if (pmem_addr) 116 munmap(pmem_addr, pmem_size); 117} 118 119Addr 120PhysicalMemory::new_page() 121{ 122 Addr return_addr = page_ptr << LogVMPageSize; 123 return_addr += base_addr; 124 125 ++page_ptr; 126 return return_addr; 127} 128 129// 130// little helper for better prot_* error messages 131// 132void 133PhysicalMemory::prot_access_error(Addr addr, int size, const string &func) 134{ 135 panic("invalid physical memory access!\n" 136 "%s: %s(addr=%#x, size=%d) out of range (max=%#x)\n", 137 name(), func, addr, size, pmem_size - 1); 138} 139 140void 141PhysicalMemory::prot_read(Addr addr, uint8_t *p, int size) 142{ 143 if (addr + size >= pmem_size) 144 prot_access_error(addr, size, "prot_read"); 145 146 memcpy(p, pmem_addr + addr - base_addr, size); 147} 148 149void 150PhysicalMemory::prot_write(Addr addr, const uint8_t *p, int size) 151{ 152 if (addr + size >= pmem_size) 153 prot_access_error(addr, size, "prot_write"); 154 155 memcpy(pmem_addr + addr - base_addr, p, size); 156} 157 158void 159PhysicalMemory::prot_memset(Addr addr, uint8_t val, int size) 160{ 161 if (addr + size >= pmem_size) 162 prot_access_error(addr, size, "prot_memset"); 163 164 memset(pmem_addr + addr - base_addr, val, size); 165} 166 167int 168PhysicalMemory::deviceBlockSize() 169{ 170 //Can accept anysize request 171 return 0; 172} 173 174bool 175PhysicalMemory::doTimingAccess (Packet &pkt) 176{ 177 doFunctionalAccess(pkt); 178 //Schedule a response event at curTick + lat; 179 return true; 180} 181 182Tick 183PhysicalMemory::doAtomicAccess(Packet &pkt) 184{ 185 doFunctionalAccess(pkt); 186 return curTick + lat; 187} 188 189void 190PhysicalMemory::doFunctionalAccess(Packet &pkt) 191{ 192 switch (pkt.cmd) { 193 case Read: 194 prot_read(pkt.addr, (uint8_t *)pkt.data, pkt.size); 195 196 case Write: 197 prot_write(pkt.addr, (uint8_t *)pkt.data, pkt.size); 198 199 default: 200 panic("unimplemented"); 201 } 202} 203 204Port * 205PhysicalMemory::getPort(const char *if_name) 206{ 207 return &memoryPort; 208} 209 210void 211PhysicalMemory::recvStatusChange(Port::Status status) 212{ 213 panic("??"); 214} 215 216PhysicalMemory::MemoryPort::MemoryPort(PhysicalMemory *_memory) 217 : memory(_memory) 218{ } 219 220void 221PhysicalMemory::MemoryPort::recvStatusChange(Port::Status status) 222{ 223 memory->recvStatusChange(status); 224} 225 226void 227PhysicalMemory::MemoryPort::getDeviceAddressRanges(AddrRangeList &range_list, 228 bool &owner) 229{ 230 panic("??"); 231} 232 233 234bool 235PhysicalMemory::MemoryPort::recvTiming(Packet &pkt) 236{ 237 return memory->doTimingAccess(pkt); 238} 239 240Tick 241PhysicalMemory::MemoryPort::recvAtomic(Packet &pkt) 242{ 243 return memory->doAtomicAccess(pkt); 244} 245 246void 247PhysicalMemory::MemoryPort::recvFunctional(Packet &pkt) 248{ 249 memory->doFunctionalAccess(pkt); 250} 251 252 253 254void 255PhysicalMemory::serialize(ostream &os) 256{ 257 gzFile compressedMem; 258 string filename = name() + ".physmem"; 259 260 SERIALIZE_SCALAR(pmem_size); 261 SERIALIZE_SCALAR(filename); 262 263 // write memory file 264 string thefile = Checkpoint::dir() + "/" + filename.c_str(); 265 int fd = creat(thefile.c_str(), 0664); 266 if (fd < 0) { 267 perror("creat"); 268 fatal("Can't open physical memory checkpoint file '%s'\n", filename); 269 } 270 271 compressedMem = gzdopen(fd, "wb"); 272 if (compressedMem == NULL) 273 fatal("Insufficient memory to allocate compression state for %s\n", 274 filename); 275 276 if (gzwrite(compressedMem, pmem_addr, pmem_size) != pmem_size) { 277 fatal("Write failed on physical memory checkpoint file '%s'\n", 278 filename); 279 } 280 281 if (gzclose(compressedMem)) 282 fatal("Close failed on physical memory checkpoint file '%s'\n", 283 filename); 284} 285 286void 287PhysicalMemory::unserialize(Checkpoint *cp, const string §ion) 288{ 289 gzFile compressedMem; 290 long *tempPage; 291 long *pmem_current; 292 uint64_t curSize; 293 uint32_t bytesRead; 294 const int chunkSize = 16384; 295 296 297 // unmap file that was mmaped in the constructor 298 munmap(pmem_addr, pmem_size); 299 300 string filename; 301 302 UNSERIALIZE_SCALAR(pmem_size); 303 UNSERIALIZE_SCALAR(filename); 304 305 filename = cp->cptDir + "/" + filename; 306 307 // mmap memoryfile 308 int fd = open(filename.c_str(), O_RDONLY); 309 if (fd < 0) { 310 perror("open"); 311 fatal("Can't open physical memory checkpoint file '%s'", filename); 312 } 313 314 compressedMem = gzdopen(fd, "rb"); 315 if (compressedMem == NULL) 316 fatal("Insufficient memory to allocate compression state for %s\n", 317 filename); 318 319 320 pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE, 321 MAP_ANON | MAP_PRIVATE, -1, 0); 322 323 if (pmem_addr == (void *)MAP_FAILED) { 324 perror("mmap"); 325 fatal("Could not mmap physical memory!\n"); 326 } 327 328 curSize = 0; 329 tempPage = (long*)malloc(chunkSize); 330 if (tempPage == NULL) 331 fatal("Unable to malloc memory to read file %s\n", filename); 332 333 /* Only copy bytes that are non-zero, so we don't give the VM system hell */ 334 while (curSize < pmem_size) { 335 bytesRead = gzread(compressedMem, tempPage, chunkSize); 336 if (bytesRead != chunkSize && bytesRead != pmem_size - curSize) 337 fatal("Read failed on physical memory checkpoint file '%s'" 338 " got %d bytes, expected %d or %d bytes\n", 339 filename, bytesRead, chunkSize, pmem_size-curSize); 340 341 assert(bytesRead % sizeof(long) == 0); 342 343 for (int x = 0; x < bytesRead/sizeof(long); x++) 344 { 345 if (*(tempPage+x) != 0) { 346 pmem_current = (long*)(pmem_addr + curSize + x * sizeof(long)); 347 *pmem_current = *(tempPage+x); 348 } 349 } 350 curSize += bytesRead; 351 } 352 353 free(tempPage); 354 355 if (gzclose(compressedMem)) 356 fatal("Close failed on physical memory checkpoint file '%s'\n", 357 filename); 358 359} 360 361 362BEGIN_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory) 363 364 Param<string> file; 365#if FULL_SYSTEM 366 SimObjectParam<MemoryController *> mmu; 367#endif 368 Param<Range<Addr> > range; 369 370END_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory) 371 372BEGIN_INIT_SIM_OBJECT_PARAMS(PhysicalMemory) 373 374 INIT_PARAM_DFLT(file, "memory mapped file", ""), 375#if FULL_SYSTEM 376 INIT_PARAM(mmu, "Memory Controller"), 377#endif 378 INIT_PARAM(range, "Device Address Range") 379 380END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory) 381 382CREATE_SIM_OBJECT(PhysicalMemory) 383{ 384#if FULL_SYSTEM 385 if (mmu) { 386 return new PhysicalMemory(getInstanceName(), range, mmu, file); 387 } 388#endif 389 390 return new PhysicalMemory(getInstanceName()); 391} 392 393REGISTER_SIM_OBJECT("PhysicalMemory", PhysicalMemory) 394