src/sim/system.cc

   1 /*
   2  * Copyright (c) 2011-2013 ARM Limited
   3  * All rights reserved
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Copyright (c) 2003-2006 The Regents of The University of Michigan
  15  * Copyright (c) 2011 Regents of the University of California
  16  * All rights reserved.
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions are
  20  * met: redistributions of source code must retain the above copyright
  21  * notice, this list of conditions and the following disclaimer;
  22  * redistributions in binary form must reproduce the above copyright
  23  * notice, this list of conditions and the following disclaimer in the
  24  * documentation and/or other materials provided with the distribution;
  25  * neither the name of the copyright holders nor the names of its
  26  * contributors may be used to endorse or promote products derived from
  27  * this software without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  30  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  31  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  32  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  33  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  34  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  35  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  36  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  37  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  38  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  39  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40  *
  41  * Authors: Steve Reinhardt
  42  *          Lisa Hsu
  43  *          Nathan Binkert
  44  *          Ali Saidi
  45  *          Rick Strong
  46  */
  47
  48 #include "arch/isa_traits.hh"
  49 #include "arch/remote_gdb.hh"
  50 #include "arch/utility.hh"
  51 #include "arch/vtophys.hh"
  52 #include "base/loader/object_file.hh"
  53 #include "base/loader/symtab.hh"
  54 #include "base/str.hh"
  55 #include "base/trace.hh"
  56 #include "config/the_isa.hh"
  57 #include "cpu/thread_context.hh"
  58 #include "debug/Loader.hh"
  59 #include "debug/WorkItems.hh"
  60 #include "kern/kernel_stats.hh"
  61 #include "mem/abstract_mem.hh"
  62 #include "mem/physical.hh"
  63 #include "params/System.hh"
  64 #include "sim/byteswap.hh"
  65 #include "sim/debug.hh"
  66 #include "sim/full_system.hh"
  67 #include "sim/system.hh"
  68
  69 using namespace std;
  70 using namespace TheISA;
  71
  72 vector<System *> System::systemList;
  73
  74 int System::numSystemsRunning = 0;
  75
  76 System::System(Params *p)
  77     : MemObject(p), _systemPort("system_port", this),
  78       _numContexts(0),
  79       pagePtr(0),
  80       init_param(p->init_param),
  81       physProxy(_systemPort, p->cache_line_size),
  82       virtProxy(_systemPort, p->cache_line_size),
  83       loadAddrMask(p->load_addr_mask),
  84       nextPID(0),
  85       physmem(name() + ".physmem", p->memories),
  86       memoryMode(p->mem_mode),
  87       _cacheLineSize(p->cache_line_size),
  88       workItemsBegin(0),
  89       workItemsEnd(0),
  90       numWorkIds(p->num_work_ids),
  91       _params(p),
  92       totalNumInsts(0),
  93       instEventQueue("system instruction-based event queue")
  94 {
  95     // add self to global system list
  96     systemList.push_back(this);
  97
  98     if (FullSystem) {
  99         kernelSymtab = new SymbolTable;
 100         if (!debugSymbolTable)
 101             debugSymbolTable = new SymbolTable;
 102     }
 103
 104     // check if the cache line size is a value known to work
 105     if (!(_cacheLineSize == 16 || _cacheLineSize == 32 ||
 106           _cacheLineSize == 64 || _cacheLineSize == 128))
 107         warn_once("Cache line size is neither 16, 32, 64 nor 128 bytes.\n");
 108
 109     // Get the generic system master IDs
 110     MasterID tmp_id M5_VAR_USED;
 111     tmp_id = getMasterId("writebacks");
 112     assert(tmp_id == Request::wbMasterId);
 113     tmp_id = getMasterId("functional");
 114     assert(tmp_id == Request::funcMasterId);
 115     tmp_id = getMasterId("interrupt");
 116     assert(tmp_id == Request::intMasterId);
 117
 118     if (FullSystem) {
 119         if (params()->kernel == "") {
 120             inform("No kernel set for full system simulation. "
 121                    "Assuming you know what you're doing\n");
 122
 123             kernel = NULL;
 124         } else {
 125             // Get the kernel code
 126             kernel = createObjectFile(params()->kernel);
 127             inform("kernel located at: %s", params()->kernel);
 128
 129             if (kernel == NULL)
 130                 fatal("Could not load kernel file %s", params()->kernel);
 131
 132             // setup entry points
 133             kernelStart = kernel->textBase();
 134             kernelEnd = kernel->bssBase() + kernel->bssSize();
 135             kernelEntry = kernel->entryPoint();
 136
 137             // load symbols
 138             if (!kernel->loadGlobalSymbols(kernelSymtab))
 139                 fatal("could not load kernel symbols\n");
 140
 141             if (!kernel->loadLocalSymbols(kernelSymtab))
 142                 fatal("could not load kernel local symbols\n");
 143
 144             if (!kernel->loadGlobalSymbols(debugSymbolTable))
 145                 fatal("could not load kernel symbols\n");
 146
 147             if (!kernel->loadLocalSymbols(debugSymbolTable))
 148                 fatal("could not load kernel local symbols\n");
 149
 150             // Loading only needs to happen once and after memory system is
 151             // connected so it will happen in initState()
 152         }
 153     }
 154
 155     // increment the number of running systms
 156     numSystemsRunning++;
 157
 158     // Set back pointers to the system in all memories
 159     for (int x = 0; x < params()->memories.size(); x++)
 160         params()->memories[x]->system(this);
 161 }
 162
 163 System::~System()
 164 {
 165     delete kernelSymtab;
 166     delete kernel;
 167
 168     for (uint32_t j = 0; j < numWorkIds; j++)
 169         delete workItemStats[j];
 170 }
 171
 172 void
 173 System::init()
 174 {
 175     // check that the system port is connected
 176     if (!_systemPort.isConnected())
 177         panic("System port on %s is not connected.\n", name());
 178 }
 179
 180 BaseMasterPort&
 181 System::getMasterPort(const std::string &if_name, PortID idx)
 182 {
 183     // no need to distinguish at the moment (besides checking)
 184     return _systemPort;
 185 }
 186
 187 void
 188 System::setMemoryMode(Enums::MemoryMode mode)
 189 {
 190     assert(getDrainState() == Drainable::Drained);
 191     memoryMode = mode;
 192 }
 193
 194 bool System::breakpoint()
 195 {
 196     if (remoteGDB.size())
 197         return remoteGDB[0]->breakpoint();
 198     return false;
 199 }
 200
 201 /**
 202  * Setting rgdb_wait to a positive integer waits for a remote debugger to
 203  * connect to that context ID before continuing.  This should really
 204    be a parameter on the CPU object or something...
 205  */
 206 int rgdb_wait = -1;
 207
 208 int
 209 System::registerThreadContext(ThreadContext *tc, int assigned)
 210 {
 211     int id;
 212     if (assigned == -1) {
 213         for (id = 0; id < threadContexts.size(); id++) {
 214             if (!threadContexts[id])
 215                 break;
 216         }
 217
 218         if (threadContexts.size() <= id)
 219             threadContexts.resize(id + 1);
 220     } else {
 221         if (threadContexts.size() <= assigned)
 222             threadContexts.resize(assigned + 1);
 223         id = assigned;
 224     }
 225
 226     if (threadContexts[id])
 227         fatal("Cannot have two CPUs with the same id (%d)\n", id);
 228
 229     threadContexts[id] = tc;
 230     _numContexts++;
 231
 232     int port = getRemoteGDBPort();
 233     if (port) {
 234         RemoteGDB *rgdb = new RemoteGDB(this, tc);
 235         GDBListener *gdbl = new GDBListener(rgdb, port + id);
 236         gdbl->listen();
 237
 238         if (rgdb_wait != -1 && rgdb_wait == id)
 239             gdbl->accept();
 240
 241         if (remoteGDB.size() <= id) {
 242             remoteGDB.resize(id + 1);
 243         }
 244
 245         remoteGDB[id] = rgdb;
 246     }
 247
 248     activeCpus.push_back(false);
 249
 250     return id;
 251 }
 252
 253 int
 254 System::numRunningContexts()
 255 {
 256     int running = 0;
 257     for (int i = 0; i < _numContexts; ++i) {
 258         if (threadContexts[i]->status() != ThreadContext::Halted)
 259             ++running;
 260     }
 261     return running;
 262 }
 263
 264 void
 265 System::initState()
 266 {
 267     if (FullSystem) {
 268         for (int i = 0; i < threadContexts.size(); i++)
 269             TheISA::startupCPU(threadContexts[i], i);
 270         // Moved from the constructor to here since it relies on the
 271         // address map being resolved in the interconnect
 272         /**
 273          * Load the kernel code into memory
 274          */
 275         if (params()->kernel != "")  {
 276             // Validate kernel mapping before loading binary
 277             if (!(isMemAddr(kernelStart & loadAddrMask) &&
 278                             isMemAddr(kernelEnd & loadAddrMask))) {
 279                 fatal("Kernel is mapped to invalid location (not memory). "
 280                       "kernelStart 0x(%x) - kernelEnd 0x(%x)\n", kernelStart,
 281                       kernelEnd);
 282             }
 283             // Load program sections into memory
 284             kernel->loadSections(physProxy, loadAddrMask);
 285
 286             DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
 287             DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
 288             DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
 289             DPRINTF(Loader, "Kernel loaded...\n");
 290         }
 291     }
 292
 293     activeCpus.clear();
 294 }
 295
 296 void
 297 System::replaceThreadContext(ThreadContext *tc, int context_id)
 298 {
 299     if (context_id >= threadContexts.size()) {
 300         panic("replaceThreadContext: bad id, %d >= %d\n",
 301               context_id, threadContexts.size());
 302     }
 303
 304     threadContexts[context_id] = tc;
 305     if (context_id < remoteGDB.size())
 306         remoteGDB[context_id]->replaceThreadContext(tc);
 307 }
 308
 309 Addr
 310 System::allocPhysPages(int npages)
 311 {
 312     Addr return_addr = pagePtr << LogVMPageSize;
 313     pagePtr += npages;
 314     if ((pagePtr << LogVMPageSize) > physmem.totalSize())
 315         fatal("Out of memory, please increase size of physical memory.");
 316     return return_addr;
 317 }
 318
 319 Addr
 320 System::memSize() const
 321 {
 322     return physmem.totalSize();
 323 }
 324
 325 Addr
 326 System::freeMemSize() const
 327 {
 328    return physmem.totalSize() - (pagePtr << LogVMPageSize);
 329 }
 330
 331 bool
 332 System::isMemAddr(Addr addr) const
 333 {
 334     return physmem.isMemAddr(addr);
 335 }
 336
 337 unsigned int
 338 System::drain(DrainManager *dm)
 339 {
 340     setDrainState(Drainable::Drained);
 341     return 0;
 342 }
 343
 344 void
 345 System::drainResume()
 346 {
 347     Drainable::drainResume();
 348     totalNumInsts = 0;
 349 }
 350
 351 void
 352 System::serialize(ostream &os)
 353 {
 354     if (FullSystem)
 355         kernelSymtab->serialize("kernel_symtab", os);
 356     SERIALIZE_SCALAR(pagePtr);
 357     SERIALIZE_SCALAR(nextPID);
 358     serializeSymtab(os);
 359
 360     // also serialize the memories in the system
 361     nameOut(os, csprintf("%s.physmem", name()));
 362     physmem.serialize(os);
 363 }
 364
 365
 366 void
 367 System::unserialize(Checkpoint *cp, const string &section)
 368 {
 369     if (FullSystem)
 370         kernelSymtab->unserialize("kernel_symtab", cp, section);
 371     UNSERIALIZE_SCALAR(pagePtr);
 372     UNSERIALIZE_SCALAR(nextPID);
 373     unserializeSymtab(cp, section);
 374
 375     // also unserialize the memories in the system
 376     physmem.unserialize(cp, csprintf("%s.physmem", name()));
 377 }
 378
 379 void
 380 System::regStats()
 381 {
 382     for (uint32_t j = 0; j < numWorkIds ; j++) {
 383         workItemStats[j] = new Stats::Histogram();
 384         stringstream namestr;
 385         ccprintf(namestr, "work_item_type%d", j);
 386         workItemStats[j]->init(20)
 387                          .name(name() + "." + namestr.str())
 388                          .desc("Run time stat for" + namestr.str())
 389                          .prereq(*workItemStats[j]);
 390     }
 391 }
 392
 393 void
 394 System::workItemEnd(uint32_t tid, uint32_t workid)
 395 {
 396     std::pair<uint32_t,uint32_t> p(tid, workid);
 397     if (!lastWorkItemStarted.count(p))
 398         return;
 399
 400     Tick samp = curTick() - lastWorkItemStarted[p];
 401     DPRINTF(WorkItems, "Work item end: %d\t%d\t%lld\n", tid, workid, samp);
 402
 403     if (workid >= numWorkIds)
 404         fatal("Got workid greater than specified in system configuration\n");
 405
 406     workItemStats[workid]->sample(samp);
 407     lastWorkItemStarted.erase(p);
 408 }
 409
 410 void
 411 System::printSystems()
 412 {
 413     vector<System *>::iterator i = systemList.begin();
 414     vector<System *>::iterator end = systemList.end();
 415     for (; i != end; ++i) {
 416         System *sys = *i;
 417         cerr << "System " << sys->name() << ": " << hex << sys << endl;
 418     }
 419 }
 420
 421 void
 422 printSystems()
 423 {
 424     System::printSystems();
 425 }
 426
 427 MasterID
 428 System::getMasterId(std::string master_name)
 429 {
 430     // strip off system name if the string starts with it
 431     if (startswith(master_name, name()))
 432         master_name = master_name.erase(0, name().size() + 1);
 433
 434     // CPUs in switch_cpus ask for ids again after switching
 435     for (int i = 0; i < masterIds.size(); i++) {
 436         if (masterIds[i] == master_name) {
 437             return i;
 438         }
 439     }
 440
 441     // Verify that the statistics haven't been enabled yet
 442     // Otherwise objects will have sized their stat buckets and
 443     // they will be too small
 444
 445     if (Stats::enabled())
 446         fatal("Can't request a masterId after regStats(). \
 447                 You must do so in init().\n");
 448
 449     masterIds.push_back(master_name);
 450
 451     return masterIds.size() - 1;
 452 }
 453
 454 std::string
 455 System::getMasterName(MasterID master_id)
 456 {
 457     if (master_id >= masterIds.size())
 458         fatal("Invalid master_id passed to getMasterName()\n");
 459
 460     return masterIds[master_id];
 461 }
 462
 463 const char *System::MemoryModeStrings[4] = {"invalid", "atomic", "timing",
 464                                             "atomic_noncaching"};
 465
 466 System *
 467 SystemParams::create()
 468 {
 469     return new System(this);
 470 }