src/sim/system.cc

   1 /*
   2  * Copyright (c) 2011-2014 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/remote_gdb.hh"
  49 #include "arch/utility.hh"
  50 #include "base/loader/object_file.hh"
  51 #include "base/loader/symtab.hh"
  52 #include "base/str.hh"
  53 #include "base/trace.hh"
  54 #include "cpu/thread_context.hh"
  55 #include "debug/Loader.hh"
  56 #include "debug/WorkItems.hh"
  57 #include "mem/abstract_mem.hh"
  58 #include "mem/physical.hh"
  59 #include "params/System.hh"
  60 #include "sim/byteswap.hh"
  61 #include "sim/debug.hh"
  62 #include "sim/full_system.hh"
  63 #include "sim/system.hh"
  64
  65 /**
  66  * To avoid linking errors with LTO, only include the header if we
  67  * actually have a definition.
  68  */
  69 #if THE_ISA != NULL_ISA
  70 #include "kern/kernel_stats.hh"
  71 #endif
  72
  73 using namespace std;
  74 using namespace TheISA;
  75
  76 vector<System *> System::systemList;
  77
  78 int System::numSystemsRunning = 0;
  79
  80 System::System(Params *p)
  81     : MemObject(p), _systemPort("system_port", this),
  82       _numContexts(0),
  83       pagePtr(0),
  84       init_param(p->init_param),
  85       physProxy(_systemPort, p->cache_line_size),
  86       kernelSymtab(nullptr),
  87       kernel(nullptr),
  88       loadAddrMask(p->load_addr_mask),
  89       loadAddrOffset(p->load_offset),
  90       nextPID(0),
  91       physmem(name() + ".physmem", p->memories, p->mmap_using_noreserve),
  92       memoryMode(p->mem_mode),
  93       _cacheLineSize(p->cache_line_size),
  94       workItemsBegin(0),
  95       workItemsEnd(0),
  96       numWorkIds(p->num_work_ids),
  97       _params(p),
  98       totalNumInsts(0),
  99       instEventQueue("system instruction-based event queue")
 100 {
 101     // add self to global system list
 102     systemList.push_back(this);
 103
 104     if (FullSystem) {
 105         kernelSymtab = new SymbolTable;
 106         if (!debugSymbolTable)
 107             debugSymbolTable = new SymbolTable;
 108     }
 109
 110     // check if the cache line size is a value known to work
 111     if (!(_cacheLineSize == 16 || _cacheLineSize == 32 ||
 112           _cacheLineSize == 64 || _cacheLineSize == 128))
 113         warn_once("Cache line size is neither 16, 32, 64 nor 128 bytes.\n");
 114
 115     // Get the generic system master IDs
 116     MasterID tmp_id M5_VAR_USED;
 117     tmp_id = getMasterId("writebacks");
 118     assert(tmp_id == Request::wbMasterId);
 119     tmp_id = getMasterId("functional");
 120     assert(tmp_id == Request::funcMasterId);
 121     tmp_id = getMasterId("interrupt");
 122     assert(tmp_id == Request::intMasterId);
 123
 124     if (FullSystem) {
 125         if (params()->kernel == "") {
 126             inform("No kernel set for full system simulation. "
 127                    "Assuming you know what you're doing\n");
 128         } else {
 129             // Get the kernel code
 130             kernel = createObjectFile(params()->kernel);
 131             inform("kernel located at: %s", params()->kernel);
 132
 133             if (kernel == NULL)
 134                 fatal("Could not load kernel file %s", params()->kernel);
 135
 136             // setup entry points
 137             kernelStart = kernel->textBase();
 138             kernelEnd = kernel->bssBase() + kernel->bssSize();
 139             kernelEntry = kernel->entryPoint();
 140
 141             // load symbols
 142             if (!kernel->loadGlobalSymbols(kernelSymtab))
 143                 fatal("could not load kernel symbols\n");
 144
 145             if (!kernel->loadLocalSymbols(kernelSymtab))
 146                 fatal("could not load kernel local symbols\n");
 147
 148             if (!kernel->loadGlobalSymbols(debugSymbolTable))
 149                 fatal("could not load kernel symbols\n");
 150
 151             if (!kernel->loadLocalSymbols(debugSymbolTable))
 152                 fatal("could not load kernel local symbols\n");
 153
 154             // Loading only needs to happen once and after memory system is
 155             // connected so it will happen in initState()
 156         }
 157     }
 158
 159     // increment the number of running systms
 160     numSystemsRunning++;
 161
 162     // Set back pointers to the system in all memories
 163     for (int x = 0; x < params()->memories.size(); x++)
 164         params()->memories[x]->system(this);
 165 }
 166
 167 System::~System()
 168 {
 169     delete kernelSymtab;
 170     delete kernel;
 171
 172     for (uint32_t j = 0; j < numWorkIds; j++)
 173         delete workItemStats[j];
 174 }
 175
 176 void
 177 System::init()
 178 {
 179     // check that the system port is connected
 180     if (!_systemPort.isConnected())
 181         panic("System port on %s is not connected.\n", name());
 182 }
 183
 184 BaseMasterPort&
 185 System::getMasterPort(const std::string &if_name, PortID idx)
 186 {
 187     // no need to distinguish at the moment (besides checking)
 188     return _systemPort;
 189 }
 190
 191 void
 192 System::setMemoryMode(Enums::MemoryMode mode)
 193 {
 194     assert(getDrainState() == Drainable::Drained);
 195     memoryMode = mode;
 196 }
 197
 198 bool System::breakpoint()
 199 {
 200     if (remoteGDB.size())
 201         return remoteGDB[0]->breakpoint();
 202     return false;
 203 }
 204
 205 /**
 206  * Setting rgdb_wait to a positive integer waits for a remote debugger to
 207  * connect to that context ID before continuing.  This should really
 208    be a parameter on the CPU object or something...
 209  */
 210 int rgdb_wait = -1;
 211
 212 int
 213 System::registerThreadContext(ThreadContext *tc, int assigned)
 214 {
 215     int id;
 216     if (assigned == -1) {
 217         for (id = 0; id < threadContexts.size(); id++) {
 218             if (!threadContexts[id])
 219                 break;
 220         }
 221
 222         if (threadContexts.size() <= id)
 223             threadContexts.resize(id + 1);
 224     } else {
 225         if (threadContexts.size() <= assigned)
 226             threadContexts.resize(assigned + 1);
 227         id = assigned;
 228     }
 229
 230     if (threadContexts[id])
 231         fatal("Cannot have two CPUs with the same id (%d)\n", id);
 232
 233     threadContexts[id] = tc;
 234     _numContexts++;
 235
 236 #if THE_ISA != NULL_ISA
 237     int port = getRemoteGDBPort();
 238     if (port) {
 239         RemoteGDB *rgdb = new RemoteGDB(this, tc);
 240         GDBListener *gdbl = new GDBListener(rgdb, port + id);
 241         gdbl->listen();
 242
 243         if (rgdb_wait != -1 && rgdb_wait == id)
 244             gdbl->accept();
 245
 246         if (remoteGDB.size() <= id) {
 247             remoteGDB.resize(id + 1);
 248         }
 249
 250         remoteGDB[id] = rgdb;
 251     }
 252 #endif
 253
 254     activeCpus.push_back(false);
 255
 256     return id;
 257 }
 258
 259 int
 260 System::numRunningContexts()
 261 {
 262     int running = 0;
 263     for (int i = 0; i < _numContexts; ++i) {
 264         if (threadContexts[i]->status() != ThreadContext::Halted)
 265             ++running;
 266     }
 267     return running;
 268 }
 269
 270 void
 271 System::initState()
 272 {
 273     if (FullSystem) {
 274         for (int i = 0; i < threadContexts.size(); i++)
 275             TheISA::startupCPU(threadContexts[i], i);
 276         // Moved from the constructor to here since it relies on the
 277         // address map being resolved in the interconnect
 278         /**
 279          * Load the kernel code into memory
 280          */
 281         if (params()->kernel != "")  {
 282             if (params()->kernel_addr_check) {
 283                 // Validate kernel mapping before loading binary
 284                 if (!(isMemAddr((kernelStart & loadAddrMask) +
 285                                 loadAddrOffset) &&
 286                       isMemAddr((kernelEnd & loadAddrMask) +
 287                                 loadAddrOffset))) {
 288                     fatal("Kernel is mapped to invalid location (not memory). "
 289                           "kernelStart 0x(%x) - kernelEnd 0x(%x) %#x:%#x\n",
 290                           kernelStart,
 291                           kernelEnd, (kernelStart & loadAddrMask) +
 292                           loadAddrOffset,
 293                           (kernelEnd & loadAddrMask) + loadAddrOffset);
 294                 }
 295             }
 296             // Load program sections into memory
 297             kernel->loadSections(physProxy, loadAddrMask, loadAddrOffset);
 298
 299             DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
 300             DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
 301             DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
 302             DPRINTF(Loader, "Kernel loaded...\n");
 303         }
 304     }
 305 }
 306
 307 void
 308 System::replaceThreadContext(ThreadContext *tc, int context_id)
 309 {
 310     if (context_id >= threadContexts.size()) {
 311         panic("replaceThreadContext: bad id, %d >= %d\n",
 312               context_id, threadContexts.size());
 313     }
 314
 315     threadContexts[context_id] = tc;
 316     if (context_id < remoteGDB.size())
 317         remoteGDB[context_id]->replaceThreadContext(tc);
 318 }
 319
 320 Addr
 321 System::allocPhysPages(int npages)
 322 {
 323     Addr return_addr = pagePtr << PageShift;
 324     pagePtr += npages;
 325
 326     Addr next_return_addr = pagePtr << PageShift;
 327
 328     AddrRange m5opRange(0xffff0000, 0xffffffff);
 329     if (m5opRange.contains(next_return_addr)) {
 330         warn("Reached m5ops MMIO region\n");
 331         return_addr = 0xffffffff;
 332         pagePtr = 0xffffffff >> PageShift;
 333     }
 334
 335     if ((pagePtr << PageShift) > physmem.totalSize())
 336         fatal("Out of memory, please increase size of physical memory.");
 337     return return_addr;
 338 }
 339
 340 Addr
 341 System::memSize() const
 342 {
 343     return physmem.totalSize();
 344 }
 345
 346 Addr
 347 System::freeMemSize() const
 348 {
 349    return physmem.totalSize() - (pagePtr << PageShift);
 350 }
 351
 352 bool
 353 System::isMemAddr(Addr addr) const
 354 {
 355     return physmem.isMemAddr(addr);
 356 }
 357
 358 unsigned int
 359 System::drain(DrainManager *dm)
 360 {
 361     setDrainState(Drainable::Drained);
 362     return 0;
 363 }
 364
 365 void
 366 System::drainResume()
 367 {
 368     Drainable::drainResume();
 369     totalNumInsts = 0;
 370 }
 371
 372 void
 373 System::serialize(ostream &os)
 374 {
 375     if (FullSystem)
 376         kernelSymtab->serialize("kernel_symtab", os);
 377     SERIALIZE_SCALAR(pagePtr);
 378     SERIALIZE_SCALAR(nextPID);
 379     serializeSymtab(os);
 380
 381     // also serialize the memories in the system
 382     nameOut(os, csprintf("%s.physmem", name()));
 383     physmem.serialize(os);
 384 }
 385
 386
 387 void
 388 System::unserialize(Checkpoint *cp, const string &section)
 389 {
 390     if (FullSystem)
 391         kernelSymtab->unserialize("kernel_symtab", cp, section);
 392     UNSERIALIZE_SCALAR(pagePtr);
 393     UNSERIALIZE_SCALAR(nextPID);
 394     unserializeSymtab(cp, section);
 395
 396     // also unserialize the memories in the system
 397     physmem.unserialize(cp, csprintf("%s.physmem", name()));
 398 }
 399
 400 void
 401 System::regStats()
 402 {
 403     for (uint32_t j = 0; j < numWorkIds ; j++) {
 404         workItemStats[j] = new Stats::Histogram();
 405         stringstream namestr;
 406         ccprintf(namestr, "work_item_type%d", j);
 407         workItemStats[j]->init(20)
 408                          .name(name() + "." + namestr.str())
 409                          .desc("Run time stat for" + namestr.str())
 410                          .prereq(*workItemStats[j]);
 411     }
 412 }
 413
 414 void
 415 System::workItemEnd(uint32_t tid, uint32_t workid)
 416 {
 417     std::pair<uint32_t,uint32_t> p(tid, workid);
 418     if (!lastWorkItemStarted.count(p))
 419         return;
 420
 421     Tick samp = curTick() - lastWorkItemStarted[p];
 422     DPRINTF(WorkItems, "Work item end: %d\t%d\t%lld\n", tid, workid, samp);
 423
 424     if (workid >= numWorkIds)
 425         fatal("Got workid greater than specified in system configuration\n");
 426
 427     workItemStats[workid]->sample(samp);
 428     lastWorkItemStarted.erase(p);
 429 }
 430
 431 void
 432 System::printSystems()
 433 {
 434     ios::fmtflags flags(cerr.flags());
 435
 436     vector<System *>::iterator i = systemList.begin();
 437     vector<System *>::iterator end = systemList.end();
 438     for (; i != end; ++i) {
 439         System *sys = *i;
 440         cerr << "System " << sys->name() << ": " << hex << sys << endl;
 441     }
 442
 443     cerr.flags(flags);
 444 }
 445
 446 void
 447 printSystems()
 448 {
 449     System::printSystems();
 450 }
 451
 452 MasterID
 453 System::getMasterId(std::string master_name)
 454 {
 455     // strip off system name if the string starts with it
 456     if (startswith(master_name, name()))
 457         master_name = master_name.erase(0, name().size() + 1);
 458
 459     // CPUs in switch_cpus ask for ids again after switching
 460     for (int i = 0; i < masterIds.size(); i++) {
 461         if (masterIds[i] == master_name) {
 462             return i;
 463         }
 464     }
 465
 466     // Verify that the statistics haven't been enabled yet
 467     // Otherwise objects will have sized their stat buckets and
 468     // they will be too small
 469
 470     if (Stats::enabled()) {
 471         fatal("Can't request a masterId after regStats(). "
 472                 "You must do so in init().\n");
 473     }
 474
 475     masterIds.push_back(master_name);
 476
 477     return masterIds.size() - 1;
 478 }
 479
 480 std::string
 481 System::getMasterName(MasterID master_id)
 482 {
 483     if (master_id >= masterIds.size())
 484         fatal("Invalid master_id passed to getMasterName()\n");
 485
 486     return masterIds[master_id];
 487 }
 488
 489 System *
 490 SystemParams::create()
 491 {
 492     return new System(this);
 493 }