abstract_mem.cc revision 2391
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/functional/physical.hh" 47#include "sim/host.hh" 48#include "sim/builder.hh" 49#include "targetarch/isa_traits.hh" 50 51using namespace std; 52 53#if FULL_SYSTEM 54PhysicalMemory::PhysicalMemory(const string &n, Range<Addr> range, 55 MemoryController *mmu, const std::string &fname) 56 : FunctionalMemory(n), base_addr(range.start), pmem_size(range.size()), 57 pmem_addr(NULL) 58{ 59 if (pmem_size % TheISA::PageBytes != 0) 60 panic("Memory Size not divisible by page size\n"); 61 62 mmu->add_child(this, range); 63 64 int fd = -1; 65 66 if (!fname.empty()) { 67 fd = open(fname.c_str(), O_RDWR | O_CREAT, 0644); 68 if (fd == -1) { 69 perror("open"); 70 fatal("Could not open physical memory file: %s\n", fname); 71 } 72 ftruncate(fd, pmem_size); 73 } 74 75 int map_flags = (fd == -1) ? (MAP_ANON | MAP_PRIVATE) : MAP_SHARED; 76 pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE, 77 map_flags, fd, 0); 78 79 if (fd != -1) 80 close(fd); 81 82 if (pmem_addr == (void *)MAP_FAILED) { 83 perror("mmap"); 84 fatal("Could not mmap!\n"); 85 } 86 87 page_ptr = 0; 88} 89#endif 90 91PhysicalMemory::PhysicalMemory(const string &n) 92 : FunctionalMemory(n), base_addr(0), pmem_addr(NULL) 93{ 94 // Hardcoded to 128 MB for now. 95 pmem_size = 1 << 27; 96 97 if (pmem_size % TheISA::PageBytes != 0) 98 panic("Memory Size not divisible by page size\n"); 99 100 int map_flags = MAP_ANON | MAP_PRIVATE; 101 pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE, 102 map_flags, -1, 0); 103 104 if (pmem_addr == (void *)MAP_FAILED) { 105 perror("mmap"); 106 fatal("Could not mmap!\n"); 107 } 108 109 page_ptr = 0; 110} 111 112PhysicalMemory::~PhysicalMemory() 113{ 114 if (pmem_addr) 115 munmap(pmem_addr, pmem_size); 116} 117 118Addr 119PhysicalMemory::new_page() 120{ 121 Addr return_addr = page_ptr << LogVMPageSize; 122 return_addr += base_addr; 123 124 ++page_ptr; 125 return return_addr; 126} 127 128// 129// little helper for better prot_* error messages 130// 131void 132PhysicalMemory::prot_access_error(Addr addr, int size, const string &func) 133{ 134 panic("invalid physical memory access!\n" 135 "%s: %s(addr=%#x, size=%d) out of range (max=%#x)\n", 136 name(), func, addr, size, pmem_size - 1); 137} 138 139void 140PhysicalMemory::prot_read(Addr addr, uint8_t *p, int size) 141{ 142 if (addr + size >= pmem_size) 143 prot_access_error(addr, size, "prot_read"); 144 145 memcpy(p, pmem_addr + addr - base_addr, size); 146} 147 148void 149PhysicalMemory::prot_write(Addr addr, const uint8_t *p, int size) 150{ 151 if (addr + size >= pmem_size) 152 prot_access_error(addr, size, "prot_write"); 153 154 memcpy(pmem_addr + addr - base_addr, p, size); 155} 156 157void 158PhysicalMemory::prot_memset(Addr addr, uint8_t val, int size) 159{ 160 if (addr + size >= pmem_size) 161 prot_access_error(addr, size, "prot_memset"); 162 163 memset(pmem_addr + addr - base_addr, val, size); 164} 165 166void 167PhysicalMemory::serialize(ostream &os) 168{ 169 gzFile compressedMem; 170 string filename = name() + ".physmem"; 171 172 SERIALIZE_SCALAR(pmem_size); 173 SERIALIZE_SCALAR(filename); 174 175 // write memory file 176 string thefile = Checkpoint::dir() + "/" + filename.c_str(); 177 int fd = creat(thefile.c_str(), 0664); 178 if (fd < 0) { 179 perror("creat"); 180 fatal("Can't open physical memory checkpoint file '%s'\n", filename); 181 } 182 183 compressedMem = gzdopen(fd, "wb"); 184 if (compressedMem == NULL) 185 fatal("Insufficient memory to allocate compression state for %s\n", 186 filename); 187 188 if (gzwrite(compressedMem, pmem_addr, pmem_size) != pmem_size) { 189 fatal("Write failed on physical memory checkpoint file '%s'\n", 190 filename); 191 } 192 193 if (gzclose(compressedMem)) 194 fatal("Close failed on physical memory checkpoint file '%s'\n", 195 filename); 196} 197 198void 199PhysicalMemory::unserialize(Checkpoint *cp, const string §ion) 200{ 201 gzFile compressedMem; 202 long *tempPage; 203 long *pmem_current; 204 uint64_t curSize; 205 uint32_t bytesRead; 206 const int chunkSize = 16384; 207 208 209 // unmap file that was mmaped in the constructor 210 munmap(pmem_addr, pmem_size); 211 212 string filename; 213 214 UNSERIALIZE_SCALAR(pmem_size); 215 UNSERIALIZE_SCALAR(filename); 216 217 filename = cp->cptDir + "/" + filename; 218 219 // mmap memoryfile 220 int fd = open(filename.c_str(), O_RDONLY); 221 if (fd < 0) { 222 perror("open"); 223 fatal("Can't open physical memory checkpoint file '%s'", filename); 224 } 225 226 compressedMem = gzdopen(fd, "rb"); 227 if (compressedMem == NULL) 228 fatal("Insufficient memory to allocate compression state for %s\n", 229 filename); 230 231 232 pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE, 233 MAP_ANON | MAP_PRIVATE, -1, 0); 234 235 if (pmem_addr == (void *)MAP_FAILED) { 236 perror("mmap"); 237 fatal("Could not mmap physical memory!\n"); 238 } 239 240 curSize = 0; 241 tempPage = (long*)malloc(chunkSize); 242 if (tempPage == NULL) 243 fatal("Unable to malloc memory to read file %s\n", filename); 244 245 /* Only copy bytes that are non-zero, so we don't give the VM system hell */ 246 while (curSize < pmem_size) { 247 bytesRead = gzread(compressedMem, tempPage, chunkSize); 248 if (bytesRead != chunkSize && bytesRead != pmem_size - curSize) 249 fatal("Read failed on physical memory checkpoint file '%s'" 250 " got %d bytes, expected %d or %d bytes\n", 251 filename, bytesRead, chunkSize, pmem_size-curSize); 252 253 assert(bytesRead % sizeof(long) == 0); 254 255 for (int x = 0; x < bytesRead/sizeof(long); x++) 256 { 257 if (*(tempPage+x) != 0) { 258 pmem_current = (long*)(pmem_addr + curSize + x * sizeof(long)); 259 *pmem_current = *(tempPage+x); 260 } 261 } 262 curSize += bytesRead; 263 } 264 265 free(tempPage); 266 267 if (gzclose(compressedMem)) 268 fatal("Close failed on physical memory checkpoint file '%s'\n", 269 filename); 270 271} 272 273BEGIN_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory) 274 275 Param<string> file; 276#if FULL_SYSTEM 277 SimObjectParam<MemoryController *> mmu; 278#endif 279 Param<Range<Addr> > range; 280 281END_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory) 282 283BEGIN_INIT_SIM_OBJECT_PARAMS(PhysicalMemory) 284 285 INIT_PARAM_DFLT(file, "memory mapped file", ""), 286#if FULL_SYSTEM 287 INIT_PARAM(mmu, "Memory Controller"), 288#endif 289 INIT_PARAM(range, "Device Address Range") 290 291END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory) 292 293CREATE_SIM_OBJECT(PhysicalMemory) 294{ 295#if FULL_SYSTEM 296 if (mmu) { 297 return new PhysicalMemory(getInstanceName(), range, mmu, file); 298 } 299#endif 300 301 return new PhysicalMemory(getInstanceName()); 302} 303 304REGISTER_SIM_OBJECT("PhysicalMemory", PhysicalMemory) 305