timing.cc revision 5669:cbac62a59686
1/* 2 * Copyright (c) 2002-2005 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 * Authors: Steve Reinhardt 29 */ 30 31#include "arch/locked_mem.hh" 32#include "arch/mmaped_ipr.hh" 33#include "arch/utility.hh" 34#include "base/bigint.hh" 35#include "cpu/exetrace.hh" 36#include "cpu/simple/timing.hh" 37#include "mem/packet.hh" 38#include "mem/packet_access.hh" 39#include "params/TimingSimpleCPU.hh" 40#include "sim/system.hh" 41 42using namespace std; 43using namespace TheISA; 44 45Port * 46TimingSimpleCPU::getPort(const std::string &if_name, int idx) 47{ 48 if (if_name == "dcache_port") 49 return &dcachePort; 50 else if (if_name == "icache_port") 51 return &icachePort; 52 else 53 panic("No Such Port\n"); 54} 55 56void 57TimingSimpleCPU::init() 58{ 59 BaseCPU::init(); 60 cpuId = tc->readCpuId(); 61#if FULL_SYSTEM 62 for (int i = 0; i < threadContexts.size(); ++i) { 63 ThreadContext *tc = threadContexts[i]; 64 65 // initialize CPU, including PC 66 TheISA::initCPU(tc, cpuId); 67 } 68#endif 69} 70 71Tick 72TimingSimpleCPU::CpuPort::recvAtomic(PacketPtr pkt) 73{ 74 panic("TimingSimpleCPU doesn't expect recvAtomic callback!"); 75 return curTick; 76} 77 78void 79TimingSimpleCPU::CpuPort::recvFunctional(PacketPtr pkt) 80{ 81 //No internal storage to update, jusst return 82 return; 83} 84 85void 86TimingSimpleCPU::CpuPort::recvStatusChange(Status status) 87{ 88 if (status == RangeChange) { 89 if (!snoopRangeSent) { 90 snoopRangeSent = true; 91 sendStatusChange(Port::RangeChange); 92 } 93 return; 94 } 95 96 panic("TimingSimpleCPU doesn't expect recvStatusChange callback!"); 97} 98 99 100void 101TimingSimpleCPU::CpuPort::TickEvent::schedule(PacketPtr _pkt, Tick t) 102{ 103 pkt = _pkt; 104 cpu->schedule(this, t); 105} 106 107TimingSimpleCPU::TimingSimpleCPU(TimingSimpleCPUParams *p) 108 : BaseSimpleCPU(p), icachePort(this, p->clock), dcachePort(this, p->clock) 109{ 110 _status = Idle; 111 112 icachePort.snoopRangeSent = false; 113 dcachePort.snoopRangeSent = false; 114 115 ifetch_pkt = dcache_pkt = NULL; 116 drainEvent = NULL; 117 fetchEvent = NULL; 118 previousTick = 0; 119 changeState(SimObject::Running); 120} 121 122 123TimingSimpleCPU::~TimingSimpleCPU() 124{ 125} 126 127void 128TimingSimpleCPU::serialize(ostream &os) 129{ 130 SimObject::State so_state = SimObject::getState(); 131 SERIALIZE_ENUM(so_state); 132 BaseSimpleCPU::serialize(os); 133} 134 135void 136TimingSimpleCPU::unserialize(Checkpoint *cp, const string §ion) 137{ 138 SimObject::State so_state; 139 UNSERIALIZE_ENUM(so_state); 140 BaseSimpleCPU::unserialize(cp, section); 141} 142 143unsigned int 144TimingSimpleCPU::drain(Event *drain_event) 145{ 146 // TimingSimpleCPU is ready to drain if it's not waiting for 147 // an access to complete. 148 if (_status == Idle || _status == Running || _status == SwitchedOut) { 149 changeState(SimObject::Drained); 150 return 0; 151 } else { 152 changeState(SimObject::Draining); 153 drainEvent = drain_event; 154 return 1; 155 } 156} 157 158void 159TimingSimpleCPU::resume() 160{ 161 DPRINTF(SimpleCPU, "Resume\n"); 162 if (_status != SwitchedOut && _status != Idle) { 163 assert(system->getMemoryMode() == Enums::timing); 164 165 // Delete the old event if it existed. 166 if (fetchEvent) { 167 if (fetchEvent->scheduled()) 168 deschedule(fetchEvent); 169 170 delete fetchEvent; 171 } 172 173 fetchEvent = new FetchEvent(this, nextCycle()); 174 } 175 176 changeState(SimObject::Running); 177} 178 179void 180TimingSimpleCPU::switchOut() 181{ 182 assert(_status == Running || _status == Idle); 183 _status = SwitchedOut; 184 numCycles += tickToCycles(curTick - previousTick); 185 186 // If we've been scheduled to resume but are then told to switch out, 187 // we'll need to cancel it. 188 if (fetchEvent && fetchEvent->scheduled()) 189 deschedule(fetchEvent); 190} 191 192 193void 194TimingSimpleCPU::takeOverFrom(BaseCPU *oldCPU) 195{ 196 BaseCPU::takeOverFrom(oldCPU, &icachePort, &dcachePort); 197 198 // if any of this CPU's ThreadContexts are active, mark the CPU as 199 // running and schedule its tick event. 200 for (int i = 0; i < threadContexts.size(); ++i) { 201 ThreadContext *tc = threadContexts[i]; 202 if (tc->status() == ThreadContext::Active && _status != Running) { 203 _status = Running; 204 break; 205 } 206 } 207 208 if (_status != Running) { 209 _status = Idle; 210 } 211 assert(threadContexts.size() == 1); 212 cpuId = tc->readCpuId(); 213 previousTick = curTick; 214} 215 216 217void 218TimingSimpleCPU::activateContext(int thread_num, int delay) 219{ 220 DPRINTF(SimpleCPU, "ActivateContext %d (%d cycles)\n", thread_num, delay); 221 222 assert(thread_num == 0); 223 assert(thread); 224 225 assert(_status == Idle); 226 227 notIdleFraction++; 228 _status = Running; 229 230 // kick things off by initiating the fetch of the next instruction 231 fetchEvent = new FetchEvent(this); 232 schedule(fetchEvent, nextCycle(curTick + ticks(delay))); 233} 234 235 236void 237TimingSimpleCPU::suspendContext(int thread_num) 238{ 239 DPRINTF(SimpleCPU, "SuspendContext %d\n", thread_num); 240 241 assert(thread_num == 0); 242 assert(thread); 243 244 assert(_status == Running); 245 246 // just change status to Idle... if status != Running, 247 // completeInst() will not initiate fetch of next instruction. 248 249 notIdleFraction--; 250 _status = Idle; 251} 252 253 254template <class T> 255Fault 256TimingSimpleCPU::read(Addr addr, T &data, unsigned flags) 257{ 258 Request *req = 259 new Request(/* asid */ 0, addr, sizeof(T), flags, thread->readPC(), 260 cpuId, /* thread ID */ 0); 261 262 if (traceData) { 263 traceData->setAddr(req->getVaddr()); 264 } 265 266 // translate to physical address 267 Fault fault = thread->translateDataReadReq(req); 268 269 // Now do the access. 270 if (fault == NoFault) { 271 PacketPtr pkt = 272 new Packet(req, 273 (req->isLocked() ? 274 MemCmd::LoadLockedReq : MemCmd::ReadReq), 275 Packet::Broadcast); 276 pkt->dataDynamic<T>(new T); 277 278 if (req->isMmapedIpr()) { 279 Tick delay; 280 delay = TheISA::handleIprRead(thread->getTC(), pkt); 281 new IprEvent(pkt, this, nextCycle(curTick + delay)); 282 _status = DcacheWaitResponse; 283 dcache_pkt = NULL; 284 } else if (!dcachePort.sendTiming(pkt)) { 285 _status = DcacheRetry; 286 dcache_pkt = pkt; 287 } else { 288 _status = DcacheWaitResponse; 289 // memory system takes ownership of packet 290 dcache_pkt = NULL; 291 } 292 293 // This will need a new way to tell if it has a dcache attached. 294 if (req->isUncacheable()) 295 recordEvent("Uncached Read"); 296 } else { 297 delete req; 298 } 299 300 if (traceData) { 301 traceData->setData(data); 302 } 303 return fault; 304} 305 306Fault 307TimingSimpleCPU::translateDataReadAddr(Addr vaddr, Addr &paddr, 308 int size, unsigned flags) 309{ 310 Request *req = 311 new Request(0, vaddr, size, flags, thread->readPC(), cpuId, 0); 312 313 if (traceData) { 314 traceData->setAddr(vaddr); 315 } 316 317 Fault fault = thread->translateDataWriteReq(req); 318 319 if (fault == NoFault) 320 paddr = req->getPaddr(); 321 322 delete req; 323 return fault; 324} 325 326#ifndef DOXYGEN_SHOULD_SKIP_THIS 327 328template 329Fault 330TimingSimpleCPU::read(Addr addr, Twin64_t &data, unsigned flags); 331 332template 333Fault 334TimingSimpleCPU::read(Addr addr, Twin32_t &data, unsigned flags); 335 336template 337Fault 338TimingSimpleCPU::read(Addr addr, uint64_t &data, unsigned flags); 339 340template 341Fault 342TimingSimpleCPU::read(Addr addr, uint32_t &data, unsigned flags); 343 344template 345Fault 346TimingSimpleCPU::read(Addr addr, uint16_t &data, unsigned flags); 347 348template 349Fault 350TimingSimpleCPU::read(Addr addr, uint8_t &data, unsigned flags); 351 352#endif //DOXYGEN_SHOULD_SKIP_THIS 353 354template<> 355Fault 356TimingSimpleCPU::read(Addr addr, double &data, unsigned flags) 357{ 358 return read(addr, *(uint64_t*)&data, flags); 359} 360 361template<> 362Fault 363TimingSimpleCPU::read(Addr addr, float &data, unsigned flags) 364{ 365 return read(addr, *(uint32_t*)&data, flags); 366} 367 368 369template<> 370Fault 371TimingSimpleCPU::read(Addr addr, int32_t &data, unsigned flags) 372{ 373 return read(addr, (uint32_t&)data, flags); 374} 375 376 377template <class T> 378Fault 379TimingSimpleCPU::write(T data, Addr addr, unsigned flags, uint64_t *res) 380{ 381 Request *req = 382 new Request(/* asid */ 0, addr, sizeof(T), flags, thread->readPC(), 383 cpuId, /* thread ID */ 0); 384 385 if (traceData) { 386 traceData->setAddr(req->getVaddr()); 387 } 388 389 // translate to physical address 390 Fault fault = thread->translateDataWriteReq(req); 391 392 // Now do the access. 393 if (fault == NoFault) { 394 MemCmd cmd = MemCmd::WriteReq; // default 395 bool do_access = true; // flag to suppress cache access 396 397 if (req->isLocked()) { 398 cmd = MemCmd::StoreCondReq; 399 do_access = TheISA::handleLockedWrite(thread, req); 400 } else if (req->isSwap()) { 401 cmd = MemCmd::SwapReq; 402 if (req->isCondSwap()) { 403 assert(res); 404 req->setExtraData(*res); 405 } 406 } 407 408 // Note: need to allocate dcache_pkt even if do_access is 409 // false, as it's used unconditionally to call completeAcc(). 410 assert(dcache_pkt == NULL); 411 dcache_pkt = new Packet(req, cmd, Packet::Broadcast); 412 dcache_pkt->allocate(); 413 dcache_pkt->set(data); 414 415 if (do_access) { 416 if (req->isMmapedIpr()) { 417 Tick delay; 418 dcache_pkt->set(htog(data)); 419 delay = TheISA::handleIprWrite(thread->getTC(), dcache_pkt); 420 new IprEvent(dcache_pkt, this, nextCycle(curTick + delay)); 421 _status = DcacheWaitResponse; 422 dcache_pkt = NULL; 423 } else if (!dcachePort.sendTiming(dcache_pkt)) { 424 _status = DcacheRetry; 425 } else { 426 _status = DcacheWaitResponse; 427 // memory system takes ownership of packet 428 dcache_pkt = NULL; 429 } 430 } 431 // This will need a new way to tell if it's hooked up to a cache or not. 432 if (req->isUncacheable()) 433 recordEvent("Uncached Write"); 434 } else { 435 delete req; 436 } 437 438 if (traceData) { 439 traceData->setData(data); 440 } 441 442 // If the write needs to have a fault on the access, consider calling 443 // changeStatus() and changing it to "bad addr write" or something. 444 return fault; 445} 446 447Fault 448TimingSimpleCPU::translateDataWriteAddr(Addr vaddr, Addr &paddr, 449 int size, unsigned flags) 450{ 451 Request *req = 452 new Request(0, vaddr, size, flags, thread->readPC(), cpuId, 0); 453 454 if (traceData) { 455 traceData->setAddr(vaddr); 456 } 457 458 Fault fault = thread->translateDataWriteReq(req); 459 460 if (fault == NoFault) 461 paddr = req->getPaddr(); 462 463 delete req; 464 return fault; 465} 466 467 468#ifndef DOXYGEN_SHOULD_SKIP_THIS 469template 470Fault 471TimingSimpleCPU::write(Twin32_t data, Addr addr, 472 unsigned flags, uint64_t *res); 473 474template 475Fault 476TimingSimpleCPU::write(Twin64_t data, Addr addr, 477 unsigned flags, uint64_t *res); 478 479template 480Fault 481TimingSimpleCPU::write(uint64_t data, Addr addr, 482 unsigned flags, uint64_t *res); 483 484template 485Fault 486TimingSimpleCPU::write(uint32_t data, Addr addr, 487 unsigned flags, uint64_t *res); 488 489template 490Fault 491TimingSimpleCPU::write(uint16_t data, Addr addr, 492 unsigned flags, uint64_t *res); 493 494template 495Fault 496TimingSimpleCPU::write(uint8_t data, Addr addr, 497 unsigned flags, uint64_t *res); 498 499#endif //DOXYGEN_SHOULD_SKIP_THIS 500 501template<> 502Fault 503TimingSimpleCPU::write(double data, Addr addr, unsigned flags, uint64_t *res) 504{ 505 return write(*(uint64_t*)&data, addr, flags, res); 506} 507 508template<> 509Fault 510TimingSimpleCPU::write(float data, Addr addr, unsigned flags, uint64_t *res) 511{ 512 return write(*(uint32_t*)&data, addr, flags, res); 513} 514 515 516template<> 517Fault 518TimingSimpleCPU::write(int32_t data, Addr addr, unsigned flags, uint64_t *res) 519{ 520 return write((uint32_t)data, addr, flags, res); 521} 522 523 524void 525TimingSimpleCPU::fetch() 526{ 527 DPRINTF(SimpleCPU, "Fetch\n"); 528 529 if (!curStaticInst || !curStaticInst->isDelayedCommit()) 530 checkForInterrupts(); 531 532 checkPcEventQueue(); 533 534 bool fromRom = isRomMicroPC(thread->readMicroPC()); 535 536 if (!fromRom) { 537 Request *ifetch_req = new Request(); 538 ifetch_req->setThreadContext(cpuId, /* thread ID */ 0); 539 Fault fault = setupFetchRequest(ifetch_req); 540 541 ifetch_pkt = new Packet(ifetch_req, MemCmd::ReadReq, Packet::Broadcast); 542 ifetch_pkt->dataStatic(&inst); 543 544 if (fault == NoFault) { 545 if (!icachePort.sendTiming(ifetch_pkt)) { 546 // Need to wait for retry 547 _status = IcacheRetry; 548 } else { 549 // Need to wait for cache to respond 550 _status = IcacheWaitResponse; 551 // ownership of packet transferred to memory system 552 ifetch_pkt = NULL; 553 } 554 } else { 555 delete ifetch_req; 556 delete ifetch_pkt; 557 // fetch fault: advance directly to next instruction (fault handler) 558 advanceInst(fault); 559 } 560 } else { 561 _status = IcacheWaitResponse; 562 completeIfetch(NULL); 563 } 564 565 numCycles += tickToCycles(curTick - previousTick); 566 previousTick = curTick; 567} 568 569 570void 571TimingSimpleCPU::advanceInst(Fault fault) 572{ 573 advancePC(fault); 574 575 if (_status == Running) { 576 // kick off fetch of next instruction... callback from icache 577 // response will cause that instruction to be executed, 578 // keeping the CPU running. 579 fetch(); 580 } 581} 582 583 584void 585TimingSimpleCPU::completeIfetch(PacketPtr pkt) 586{ 587 DPRINTF(SimpleCPU, "Complete ICache Fetch\n"); 588 589 // received a response from the icache: execute the received 590 // instruction 591 592 assert(!pkt || !pkt->isError()); 593 assert(_status == IcacheWaitResponse); 594 595 _status = Running; 596 597 numCycles += tickToCycles(curTick - previousTick); 598 previousTick = curTick; 599 600 if (getState() == SimObject::Draining) { 601 if (pkt) { 602 delete pkt->req; 603 delete pkt; 604 } 605 606 completeDrain(); 607 return; 608 } 609 610 preExecute(); 611 if (curStaticInst->isMemRef() && !curStaticInst->isDataPrefetch()) { 612 // load or store: just send to dcache 613 Fault fault = curStaticInst->initiateAcc(this, traceData); 614 if (_status != Running) { 615 // instruction will complete in dcache response callback 616 assert(_status == DcacheWaitResponse || _status == DcacheRetry); 617 assert(fault == NoFault); 618 } else { 619 if (fault == NoFault) { 620 // Note that ARM can have NULL packets if the instruction gets 621 // squashed due to predication 622 // early fail on store conditional: complete now 623 assert(dcache_pkt != NULL || THE_ISA == ARM_ISA); 624 625 fault = curStaticInst->completeAcc(dcache_pkt, this, 626 traceData); 627 if (dcache_pkt != NULL) 628 { 629 delete dcache_pkt->req; 630 delete dcache_pkt; 631 dcache_pkt = NULL; 632 } 633 634 // keep an instruction count 635 if (fault == NoFault) 636 countInst(); 637 } else if (traceData) { 638 // If there was a fault, we shouldn't trace this instruction. 639 delete traceData; 640 traceData = NULL; 641 } 642 643 postExecute(); 644 // @todo remove me after debugging with legion done 645 if (curStaticInst && (!curStaticInst->isMicroop() || 646 curStaticInst->isFirstMicroop())) 647 instCnt++; 648 advanceInst(fault); 649 } 650 } else { 651 // non-memory instruction: execute completely now 652 Fault fault = curStaticInst->execute(this, traceData); 653 654 // keep an instruction count 655 if (fault == NoFault) 656 countInst(); 657 else if (traceData) { 658 // If there was a fault, we shouldn't trace this instruction. 659 delete traceData; 660 traceData = NULL; 661 } 662 663 postExecute(); 664 // @todo remove me after debugging with legion done 665 if (curStaticInst && (!curStaticInst->isMicroop() || 666 curStaticInst->isFirstMicroop())) 667 instCnt++; 668 advanceInst(fault); 669 } 670 671 if (pkt) { 672 delete pkt->req; 673 delete pkt; 674 } 675} 676 677void 678TimingSimpleCPU::IcachePort::ITickEvent::process() 679{ 680 cpu->completeIfetch(pkt); 681} 682 683bool 684TimingSimpleCPU::IcachePort::recvTiming(PacketPtr pkt) 685{ 686 if (pkt->isResponse() && !pkt->wasNacked()) { 687 // delay processing of returned data until next CPU clock edge 688 Tick next_tick = cpu->nextCycle(curTick); 689 690 if (next_tick == curTick) 691 cpu->completeIfetch(pkt); 692 else 693 tickEvent.schedule(pkt, next_tick); 694 695 return true; 696 } 697 else if (pkt->wasNacked()) { 698 assert(cpu->_status == IcacheWaitResponse); 699 pkt->reinitNacked(); 700 if (!sendTiming(pkt)) { 701 cpu->_status = IcacheRetry; 702 cpu->ifetch_pkt = pkt; 703 } 704 } 705 //Snooping a Coherence Request, do nothing 706 return true; 707} 708 709void 710TimingSimpleCPU::IcachePort::recvRetry() 711{ 712 // we shouldn't get a retry unless we have a packet that we're 713 // waiting to transmit 714 assert(cpu->ifetch_pkt != NULL); 715 assert(cpu->_status == IcacheRetry); 716 PacketPtr tmp = cpu->ifetch_pkt; 717 if (sendTiming(tmp)) { 718 cpu->_status = IcacheWaitResponse; 719 cpu->ifetch_pkt = NULL; 720 } 721} 722 723void 724TimingSimpleCPU::completeDataAccess(PacketPtr pkt) 725{ 726 // received a response from the dcache: complete the load or store 727 // instruction 728 assert(!pkt->isError()); 729 assert(_status == DcacheWaitResponse); 730 _status = Running; 731 732 numCycles += tickToCycles(curTick - previousTick); 733 previousTick = curTick; 734 735 Fault fault = curStaticInst->completeAcc(pkt, this, traceData); 736 737 // keep an instruction count 738 if (fault == NoFault) 739 countInst(); 740 else if (traceData) { 741 // If there was a fault, we shouldn't trace this instruction. 742 delete traceData; 743 traceData = NULL; 744 } 745 746 // the locked flag may be cleared on the response packet, so check 747 // pkt->req and not pkt to see if it was a load-locked 748 if (pkt->isRead() && pkt->req->isLocked()) { 749 TheISA::handleLockedRead(thread, pkt->req); 750 } 751 752 delete pkt->req; 753 delete pkt; 754 755 postExecute(); 756 757 if (getState() == SimObject::Draining) { 758 advancePC(fault); 759 completeDrain(); 760 761 return; 762 } 763 764 advanceInst(fault); 765} 766 767 768void 769TimingSimpleCPU::completeDrain() 770{ 771 DPRINTF(Config, "Done draining\n"); 772 changeState(SimObject::Drained); 773 drainEvent->process(); 774} 775 776void 777TimingSimpleCPU::DcachePort::setPeer(Port *port) 778{ 779 Port::setPeer(port); 780 781#if FULL_SYSTEM 782 // Update the ThreadContext's memory ports (Functional/Virtual 783 // Ports) 784 cpu->tcBase()->connectMemPorts(cpu->tcBase()); 785#endif 786} 787 788bool 789TimingSimpleCPU::DcachePort::recvTiming(PacketPtr pkt) 790{ 791 if (pkt->isResponse() && !pkt->wasNacked()) { 792 // delay processing of returned data until next CPU clock edge 793 Tick next_tick = cpu->nextCycle(curTick); 794 795 if (next_tick == curTick) 796 cpu->completeDataAccess(pkt); 797 else 798 tickEvent.schedule(pkt, next_tick); 799 800 return true; 801 } 802 else if (pkt->wasNacked()) { 803 assert(cpu->_status == DcacheWaitResponse); 804 pkt->reinitNacked(); 805 if (!sendTiming(pkt)) { 806 cpu->_status = DcacheRetry; 807 cpu->dcache_pkt = pkt; 808 } 809 } 810 //Snooping a Coherence Request, do nothing 811 return true; 812} 813 814void 815TimingSimpleCPU::DcachePort::DTickEvent::process() 816{ 817 cpu->completeDataAccess(pkt); 818} 819 820void 821TimingSimpleCPU::DcachePort::recvRetry() 822{ 823 // we shouldn't get a retry unless we have a packet that we're 824 // waiting to transmit 825 assert(cpu->dcache_pkt != NULL); 826 assert(cpu->_status == DcacheRetry); 827 PacketPtr tmp = cpu->dcache_pkt; 828 if (sendTiming(tmp)) { 829 cpu->_status = DcacheWaitResponse; 830 // memory system takes ownership of packet 831 cpu->dcache_pkt = NULL; 832 } 833} 834 835TimingSimpleCPU::IprEvent::IprEvent(Packet *_pkt, TimingSimpleCPU *_cpu, 836 Tick t) 837 : pkt(_pkt), cpu(_cpu) 838{ 839 cpu->schedule(this, t); 840} 841 842void 843TimingSimpleCPU::IprEvent::process() 844{ 845 cpu->completeDataAccess(pkt); 846} 847 848const char * 849TimingSimpleCPU::IprEvent::description() const 850{ 851 return "Timing Simple CPU Delay IPR event"; 852} 853 854 855void 856TimingSimpleCPU::printAddr(Addr a) 857{ 858 dcachePort.printAddr(a); 859} 860 861 862//////////////////////////////////////////////////////////////////////// 863// 864// TimingSimpleCPU Simulation Object 865// 866TimingSimpleCPU * 867TimingSimpleCPUParams::create() 868{ 869 numThreads = 1; 870#if !FULL_SYSTEM 871 if (workload.size() != 1) 872 panic("only one workload allowed"); 873#endif 874 return new TimingSimpleCPU(this); 875} 876