physical.cc revision 2418
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#include "mem/physical.hh" 44#include "sim/host.hh" 45#include "sim/builder.hh" 46#include "sim/eventq.hh" 47#include "targetarch/isa_traits.hh" 48 49 50using namespace std; 51 52PhysicalMemory::MemResponseEvent::MemResponseEvent(Packet &pkt, MemoryPort* _m) 53 : Event(&mainEventQueue, CPU_Tick_Pri), pkt(pkt), memoryPort(_m) 54{ 55 56 this->setFlags(AutoDelete); 57} 58 59void 60PhysicalMemory::MemResponseEvent::process() 61{ 62 memoryPort->sendTiming(pkt); 63} 64 65const char * 66PhysicalMemory::MemResponseEvent::description() 67{ 68 return "Physical Memory Timing Access respnse event"; 69} 70 71PhysicalMemory::PhysicalMemory(const string &n) 72 : Memory(n), base_addr(0), pmem_addr(NULL) 73{ 74 // Hardcoded to 128 MB for now. 75 pmem_size = 1 << 27; 76 77 if (pmem_size % TheISA::PageBytes != 0) 78 panic("Memory Size not divisible by page size\n"); 79 80 int map_flags = MAP_ANON | MAP_PRIVATE; 81 pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE, 82 map_flags, -1, 0); 83 84 if (pmem_addr == (void *)MAP_FAILED) { 85 perror("mmap"); 86 fatal("Could not mmap!\n"); 87 } 88 89 page_ptr = 0; 90} 91 92PhysicalMemory::~PhysicalMemory() 93{ 94 if (pmem_addr) 95 munmap(pmem_addr, pmem_size); 96 //Remove memPorts? 97} 98 99Addr 100PhysicalMemory::new_page() 101{ 102 Addr return_addr = page_ptr << LogVMPageSize; 103 return_addr += base_addr; 104 105 ++page_ptr; 106 return return_addr; 107} 108 109Port * 110PhysicalMemory::addPort(std::string portName) 111{ 112 memoryPortList[portName] = new MemoryPort(this); 113 return memoryPortList[portName]; 114} 115 116// 117// little helper for better prot_* error messages 118// 119void 120PhysicalMemory::prot_access_error(Addr addr, int size, Command func) 121{ 122 panic("invalid physical memory access!\n" 123 "%s: %i(addr=%#x, size=%d) out of range (max=%#x)\n", 124 name(), func, addr, size, pmem_size - 1); 125} 126 127void 128PhysicalMemory::prot_memset(Addr addr, uint8_t val, int size) 129{ 130 if (addr + size >= pmem_size) 131 prot_access_error(addr, size, Write); 132 133 memset(pmem_addr + addr - base_addr, val, size); 134} 135 136int 137PhysicalMemory::deviceBlockSize() 138{ 139 //Can accept anysize request 140 return 0; 141} 142 143bool 144PhysicalMemory::doTimingAccess (Packet &pkt, MemoryPort* memoryPort) 145{ 146 doFunctionalAccess(pkt); 147 148 MemResponseEvent* response = new MemResponseEvent(pkt, memoryPort); 149 response->schedule(curTick + lat); 150 151 return true; 152} 153 154Tick 155PhysicalMemory::doAtomicAccess(Packet &pkt) 156{ 157 doFunctionalAccess(pkt); 158 return curTick + lat; 159} 160 161void 162PhysicalMemory::doFunctionalAccess(Packet &pkt) 163{ 164 if (pkt.addr + pkt.size >= pmem_size) 165 prot_access_error(pkt.addr, pkt.size, pkt.cmd); 166 167 switch (pkt.cmd) { 168 case Read: 169 memcpy(pkt.data, pmem_addr + pkt.addr - base_addr, pkt.size); 170 break; 171 case Write: 172 memcpy(pmem_addr + pkt.addr - base_addr, pkt.data, pkt.size); 173 break; 174 default: 175 panic("unimplemented"); 176 } 177} 178 179Port * 180PhysicalMemory::getPort(const char *if_name) 181{ 182 if (memoryPortList.find(if_name) != memoryPortList.end()) 183 return memoryPortList[if_name]; 184 else 185 panic("Looking for a port that didn't exist\n"); 186} 187 188void 189PhysicalMemory::recvStatusChange(Port::Status status) 190{ 191 panic("??"); 192} 193 194PhysicalMemory::MemoryPort::MemoryPort(PhysicalMemory *_memory) 195 : memory(_memory) 196{ } 197 198void 199PhysicalMemory::MemoryPort::recvStatusChange(Port::Status status) 200{ 201 memory->recvStatusChange(status); 202} 203 204void 205PhysicalMemory::MemoryPort::getDeviceAddressRanges(AddrRangeList &range_list, 206 bool &owner) 207{ 208 panic("??"); 209} 210 211int 212PhysicalMemory::MemoryPort::deviceBlockSize() 213{ 214 return memory->deviceBlockSize(); 215} 216 217bool 218PhysicalMemory::MemoryPort::recvTiming(Packet &pkt) 219{ 220 return memory->doTimingAccess(pkt, this); 221} 222 223Tick 224PhysicalMemory::MemoryPort::recvAtomic(Packet &pkt) 225{ 226 return memory->doAtomicAccess(pkt); 227} 228 229void 230PhysicalMemory::MemoryPort::recvFunctional(Packet &pkt) 231{ 232 memory->doFunctionalAccess(pkt); 233} 234 235 236 237void 238PhysicalMemory::serialize(ostream &os) 239{ 240 gzFile compressedMem; 241 string filename = name() + ".physmem"; 242 243 SERIALIZE_SCALAR(pmem_size); 244 SERIALIZE_SCALAR(filename); 245 246 // write memory file 247 string thefile = Checkpoint::dir() + "/" + filename.c_str(); 248 int fd = creat(thefile.c_str(), 0664); 249 if (fd < 0) { 250 perror("creat"); 251 fatal("Can't open physical memory checkpoint file '%s'\n", filename); 252 } 253 254 compressedMem = gzdopen(fd, "wb"); 255 if (compressedMem == NULL) 256 fatal("Insufficient memory to allocate compression state for %s\n", 257 filename); 258 259 if (gzwrite(compressedMem, pmem_addr, pmem_size) != pmem_size) { 260 fatal("Write failed on physical memory checkpoint file '%s'\n", 261 filename); 262 } 263 264 if (gzclose(compressedMem)) 265 fatal("Close failed on physical memory checkpoint file '%s'\n", 266 filename); 267} 268 269void 270PhysicalMemory::unserialize(Checkpoint *cp, const string §ion) 271{ 272 gzFile compressedMem; 273 long *tempPage; 274 long *pmem_current; 275 uint64_t curSize; 276 uint32_t bytesRead; 277 const int chunkSize = 16384; 278 279 280 // unmap file that was mmaped in the constructor 281 munmap(pmem_addr, pmem_size); 282 283 string filename; 284 285 UNSERIALIZE_SCALAR(pmem_size); 286 UNSERIALIZE_SCALAR(filename); 287 288 filename = cp->cptDir + "/" + filename; 289 290 // mmap memoryfile 291 int fd = open(filename.c_str(), O_RDONLY); 292 if (fd < 0) { 293 perror("open"); 294 fatal("Can't open physical memory checkpoint file '%s'", filename); 295 } 296 297 compressedMem = gzdopen(fd, "rb"); 298 if (compressedMem == NULL) 299 fatal("Insufficient memory to allocate compression state for %s\n", 300 filename); 301 302 303 pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE, 304 MAP_ANON | MAP_PRIVATE, -1, 0); 305 306 if (pmem_addr == (void *)MAP_FAILED) { 307 perror("mmap"); 308 fatal("Could not mmap physical memory!\n"); 309 } 310 311 curSize = 0; 312 tempPage = (long*)malloc(chunkSize); 313 if (tempPage == NULL) 314 fatal("Unable to malloc memory to read file %s\n", filename); 315 316 /* Only copy bytes that are non-zero, so we don't give the VM system hell */ 317 while (curSize < pmem_size) { 318 bytesRead = gzread(compressedMem, tempPage, chunkSize); 319 if (bytesRead != chunkSize && bytesRead != pmem_size - curSize) 320 fatal("Read failed on physical memory checkpoint file '%s'" 321 " got %d bytes, expected %d or %d bytes\n", 322 filename, bytesRead, chunkSize, pmem_size-curSize); 323 324 assert(bytesRead % sizeof(long) == 0); 325 326 for (int x = 0; x < bytesRead/sizeof(long); x++) 327 { 328 if (*(tempPage+x) != 0) { 329 pmem_current = (long*)(pmem_addr + curSize + x * sizeof(long)); 330 *pmem_current = *(tempPage+x); 331 } 332 } 333 curSize += bytesRead; 334 } 335 336 free(tempPage); 337 338 if (gzclose(compressedMem)) 339 fatal("Close failed on physical memory checkpoint file '%s'\n", 340 filename); 341 342} 343 344 345BEGIN_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory) 346 347 Param<string> file; 348#if FULL_SYSTEM 349 SimObjectParam<MemoryController *> mmu; 350#endif 351 Param<Range<Addr> > range; 352 353END_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory) 354 355BEGIN_INIT_SIM_OBJECT_PARAMS(PhysicalMemory) 356 357 INIT_PARAM_DFLT(file, "memory mapped file", ""), 358#if FULL_SYSTEM 359 INIT_PARAM(mmu, "Memory Controller"), 360#endif 361 INIT_PARAM(range, "Device Address Range") 362 363END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory) 364 365CREATE_SIM_OBJECT(PhysicalMemory) 366{ 367#if FULL_SYSTEM 368 if (mmu) { 369 return new PhysicalMemory(getInstanceName(), range, mmu, file); 370 } 371#endif 372 373 return new PhysicalMemory(getInstanceName()); 374} 375 376REGISTER_SIM_OBJECT("PhysicalMemory", PhysicalMemory) 377