abstract_mem.cc revision 2541
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 "arch/isa_traits.hh" 48 49 50using namespace std; 51using namespace TheISA; 52 53PhysicalMemory::MemResponseEvent::MemResponseEvent(Packet &pkt, MemoryPort* _m) 54 : Event(&mainEventQueue, CPU_Tick_Pri), pkt(pkt), memoryPort(_m) 55{ 56 57 this->setFlags(AutoDelete); 58} 59 60void 61PhysicalMemory::MemResponseEvent::process() 62{ 63 memoryPort->sendTiming(pkt); 64} 65 66const char * 67PhysicalMemory::MemResponseEvent::description() 68{ 69 return "Physical Memory Timing Access respnse event"; 70} 71 72PhysicalMemory::PhysicalMemory(const string &n) 73 : MemObject(n), base_addr(0), pmem_addr(NULL), port(NULL) 74{ 75 // Hardcoded to 128 MB for now. 76 pmem_size = 1 << 27; 77 78 if (pmem_size % TheISA::PageBytes != 0) 79 panic("Memory Size not divisible by page size\n"); 80 81 int map_flags = MAP_ANON | MAP_PRIVATE; 82 pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE, 83 map_flags, -1, 0); 84 85 if (pmem_addr == (void *)MAP_FAILED) { 86 perror("mmap"); 87 fatal("Could not mmap!\n"); 88 } 89 90 page_ptr = 0; 91} 92 93void 94PhysicalMemory::init() 95{ 96 if (!port) 97 panic("PhysicalMemory not connected to anything!"); 98 port->sendStatusChange(Port::RangeChange); 99} 100 101PhysicalMemory::~PhysicalMemory() 102{ 103 if (pmem_addr) 104 munmap(pmem_addr, pmem_size); 105 //Remove memPorts? 106} 107 108Addr 109PhysicalMemory::new_page() 110{ 111 Addr return_addr = page_ptr << LogVMPageSize; 112 return_addr += base_addr; 113 114 ++page_ptr; 115 return return_addr; 116} 117 118int 119PhysicalMemory::deviceBlockSize() 120{ 121 //Can accept anysize request 122 return 0; 123} 124 125bool 126PhysicalMemory::doTimingAccess (Packet &pkt, MemoryPort* memoryPort) 127{ 128 doFunctionalAccess(pkt); 129 130 MemResponseEvent* response = new MemResponseEvent(pkt, memoryPort); 131 response->schedule(curTick + lat); 132 133 return true; 134} 135 136Tick 137PhysicalMemory::doAtomicAccess(Packet &pkt) 138{ 139 doFunctionalAccess(pkt); 140 return curTick + lat; 141} 142 143void 144PhysicalMemory::doFunctionalAccess(Packet &pkt) 145{ 146 assert(pkt.addr + pkt.size < pmem_size); 147 148 switch (pkt.cmd) { 149 case Read: 150 memcpy(pkt.data, pmem_addr + pkt.addr - base_addr, pkt.size); 151 break; 152 case Write: 153 memcpy(pmem_addr + pkt.addr - base_addr, pkt.data, pkt.size); 154 break; 155 default: 156 panic("unimplemented"); 157 } 158 159 pkt.result = Success; 160} 161 162Port * 163PhysicalMemory::getPort(const std::string &if_name) 164{ 165 if (if_name == "") { 166 if (port != NULL) 167 panic("PhysicalMemory::getPort: additional port requested to memory!"); 168 port = new MemoryPort(this); 169 return port; 170 } else if (if_name == "functional") { 171 /* special port for functional writes at startup. */ 172 return new MemoryPort(this); 173 } else { 174 panic("PhysicalMemory::getPort: unknown port %s requested", if_name); 175 } 176} 177 178void 179PhysicalMemory::recvStatusChange(Port::Status status) 180{ 181 panic("??"); 182} 183 184PhysicalMemory::MemoryPort::MemoryPort(PhysicalMemory *_memory) 185 : memory(_memory) 186{ } 187 188void 189PhysicalMemory::MemoryPort::recvStatusChange(Port::Status status) 190{ 191 memory->recvStatusChange(status); 192} 193 194void 195PhysicalMemory::MemoryPort::getDeviceAddressRanges(AddrRangeList &resp, 196 AddrRangeList &snoop) 197{ 198 memory->getAddressRanges(resp, snoop); 199} 200 201void 202PhysicalMemory::getAddressRanges(AddrRangeList &resp, AddrRangeList &snoop) 203{ 204 snoop.clear(); 205 resp.clear(); 206 resp.push_back(RangeSize(base_addr, pmem_size)); 207} 208 209int 210PhysicalMemory::MemoryPort::deviceBlockSize() 211{ 212 return memory->deviceBlockSize(); 213} 214 215bool 216PhysicalMemory::MemoryPort::recvTiming(Packet &pkt) 217{ 218 return memory->doTimingAccess(pkt, this); 219} 220 221Tick 222PhysicalMemory::MemoryPort::recvAtomic(Packet &pkt) 223{ 224 return memory->doAtomicAccess(pkt); 225} 226 227void 228PhysicalMemory::MemoryPort::recvFunctional(Packet &pkt) 229{ 230 memory->doFunctionalAccess(pkt); 231} 232 233 234 235void 236PhysicalMemory::serialize(ostream &os) 237{ 238 gzFile compressedMem; 239 string filename = name() + ".physmem"; 240 241 SERIALIZE_SCALAR(pmem_size); 242 SERIALIZE_SCALAR(filename); 243 244 // write memory file 245 string thefile = Checkpoint::dir() + "/" + filename.c_str(); 246 int fd = creat(thefile.c_str(), 0664); 247 if (fd < 0) { 248 perror("creat"); 249 fatal("Can't open physical memory checkpoint file '%s'\n", filename); 250 } 251 252 compressedMem = gzdopen(fd, "wb"); 253 if (compressedMem == NULL) 254 fatal("Insufficient memory to allocate compression state for %s\n", 255 filename); 256 257 if (gzwrite(compressedMem, pmem_addr, pmem_size) != pmem_size) { 258 fatal("Write failed on physical memory checkpoint file '%s'\n", 259 filename); 260 } 261 262 if (gzclose(compressedMem)) 263 fatal("Close failed on physical memory checkpoint file '%s'\n", 264 filename); 265} 266 267void 268PhysicalMemory::unserialize(Checkpoint *cp, const string §ion) 269{ 270 gzFile compressedMem; 271 long *tempPage; 272 long *pmem_current; 273 uint64_t curSize; 274 uint32_t bytesRead; 275 const int chunkSize = 16384; 276 277 278 // unmap file that was mmaped in the constructor 279 munmap(pmem_addr, pmem_size); 280 281 string filename; 282 283 UNSERIALIZE_SCALAR(pmem_size); 284 UNSERIALIZE_SCALAR(filename); 285 286 filename = cp->cptDir + "/" + filename; 287 288 // mmap memoryfile 289 int fd = open(filename.c_str(), O_RDONLY); 290 if (fd < 0) { 291 perror("open"); 292 fatal("Can't open physical memory checkpoint file '%s'", filename); 293 } 294 295 compressedMem = gzdopen(fd, "rb"); 296 if (compressedMem == NULL) 297 fatal("Insufficient memory to allocate compression state for %s\n", 298 filename); 299 300 301 pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE, 302 MAP_ANON | MAP_PRIVATE, -1, 0); 303 304 if (pmem_addr == (void *)MAP_FAILED) { 305 perror("mmap"); 306 fatal("Could not mmap physical memory!\n"); 307 } 308 309 curSize = 0; 310 tempPage = (long*)malloc(chunkSize); 311 if (tempPage == NULL) 312 fatal("Unable to malloc memory to read file %s\n", filename); 313 314 /* Only copy bytes that are non-zero, so we don't give the VM system hell */ 315 while (curSize < pmem_size) { 316 bytesRead = gzread(compressedMem, tempPage, chunkSize); 317 if (bytesRead != chunkSize && bytesRead != pmem_size - curSize) 318 fatal("Read failed on physical memory checkpoint file '%s'" 319 " got %d bytes, expected %d or %d bytes\n", 320 filename, bytesRead, chunkSize, pmem_size-curSize); 321 322 assert(bytesRead % sizeof(long) == 0); 323 324 for (int x = 0; x < bytesRead/sizeof(long); x++) 325 { 326 if (*(tempPage+x) != 0) { 327 pmem_current = (long*)(pmem_addr + curSize + x * sizeof(long)); 328 *pmem_current = *(tempPage+x); 329 } 330 } 331 curSize += bytesRead; 332 } 333 334 free(tempPage); 335 336 if (gzclose(compressedMem)) 337 fatal("Close failed on physical memory checkpoint file '%s'\n", 338 filename); 339 340} 341 342 343BEGIN_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory) 344 345 Param<string> file; 346 Param<Range<Addr> > range; 347 348END_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory) 349 350BEGIN_INIT_SIM_OBJECT_PARAMS(PhysicalMemory) 351 352 INIT_PARAM_DFLT(file, "memory mapped file", ""), 353 INIT_PARAM(range, "Device Address Range") 354 355END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory) 356 357CREATE_SIM_OBJECT(PhysicalMemory) 358{ 359 360 return new PhysicalMemory(getInstanceName()); 361} 362 363REGISTER_SIM_OBJECT("PhysicalMemory", PhysicalMemory) 364