atomic.cc revision 5712
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/atomic.hh" 37#include "mem/packet.hh" 38#include "mem/packet_access.hh" 39#include "params/AtomicSimpleCPU.hh" 40#include "sim/system.hh" 41 42using namespace std; 43using namespace TheISA; 44 45AtomicSimpleCPU::TickEvent::TickEvent(AtomicSimpleCPU *c) 46 : Event(CPU_Tick_Pri), cpu(c) 47{ 48} 49 50 51void 52AtomicSimpleCPU::TickEvent::process() 53{ 54 cpu->tick(); 55} 56 57const char * 58AtomicSimpleCPU::TickEvent::description() const 59{ 60 return "AtomicSimpleCPU tick"; 61} 62 63Port * 64AtomicSimpleCPU::getPort(const std::string &if_name, int idx) 65{ 66 if (if_name == "dcache_port") 67 return &dcachePort; 68 else if (if_name == "icache_port") 69 return &icachePort; 70 else if (if_name == "physmem_port") { 71 hasPhysMemPort = true; 72 return &physmemPort; 73 } 74 else 75 panic("No Such Port\n"); 76} 77 78void 79AtomicSimpleCPU::init() 80{ 81 BaseCPU::init(); 82#if FULL_SYSTEM 83 for (int i = 0; i < threadContexts.size(); ++i) { 84 ThreadContext *tc = threadContexts[i]; 85 86 // initialize CPU, including PC 87 TheISA::initCPU(tc, _cpuId); 88 } 89#endif 90 if (hasPhysMemPort) { 91 bool snoop = false; 92 AddrRangeList pmAddrList; 93 physmemPort.getPeerAddressRanges(pmAddrList, snoop); 94 physMemAddr = *pmAddrList.begin(); 95 } 96 ifetch_req.setThreadContext(_cpuId, 0); // Add thread ID if we add MT 97 data_read_req.setThreadContext(_cpuId, 0); // Add thread ID here too 98 data_write_req.setThreadContext(_cpuId, 0); // Add thread ID here too 99} 100 101bool 102AtomicSimpleCPU::CpuPort::recvTiming(PacketPtr pkt) 103{ 104 panic("AtomicSimpleCPU doesn't expect recvTiming callback!"); 105 return true; 106} 107 108Tick 109AtomicSimpleCPU::CpuPort::recvAtomic(PacketPtr pkt) 110{ 111 //Snooping a coherence request, just return 112 return 0; 113} 114 115void 116AtomicSimpleCPU::CpuPort::recvFunctional(PacketPtr pkt) 117{ 118 //No internal storage to update, just return 119 return; 120} 121 122void 123AtomicSimpleCPU::CpuPort::recvStatusChange(Status status) 124{ 125 if (status == RangeChange) { 126 if (!snoopRangeSent) { 127 snoopRangeSent = true; 128 sendStatusChange(Port::RangeChange); 129 } 130 return; 131 } 132 133 panic("AtomicSimpleCPU doesn't expect recvStatusChange callback!"); 134} 135 136void 137AtomicSimpleCPU::CpuPort::recvRetry() 138{ 139 panic("AtomicSimpleCPU doesn't expect recvRetry callback!"); 140} 141 142void 143AtomicSimpleCPU::DcachePort::setPeer(Port *port) 144{ 145 Port::setPeer(port); 146 147#if FULL_SYSTEM 148 // Update the ThreadContext's memory ports (Functional/Virtual 149 // Ports) 150 cpu->tcBase()->connectMemPorts(cpu->tcBase()); 151#endif 152} 153 154AtomicSimpleCPU::AtomicSimpleCPU(AtomicSimpleCPUParams *p) 155 : BaseSimpleCPU(p), tickEvent(this), width(p->width), 156 simulate_data_stalls(p->simulate_data_stalls), 157 simulate_inst_stalls(p->simulate_inst_stalls), 158 icachePort(name() + "-iport", this), dcachePort(name() + "-iport", this), 159 physmemPort(name() + "-iport", this), hasPhysMemPort(false) 160{ 161 _status = Idle; 162 163 icachePort.snoopRangeSent = false; 164 dcachePort.snoopRangeSent = false; 165 166} 167 168 169AtomicSimpleCPU::~AtomicSimpleCPU() 170{ 171} 172 173void 174AtomicSimpleCPU::serialize(ostream &os) 175{ 176 SimObject::State so_state = SimObject::getState(); 177 SERIALIZE_ENUM(so_state); 178 BaseSimpleCPU::serialize(os); 179 nameOut(os, csprintf("%s.tickEvent", name())); 180 tickEvent.serialize(os); 181} 182 183void 184AtomicSimpleCPU::unserialize(Checkpoint *cp, const string §ion) 185{ 186 SimObject::State so_state; 187 UNSERIALIZE_ENUM(so_state); 188 BaseSimpleCPU::unserialize(cp, section); 189 tickEvent.unserialize(cp, csprintf("%s.tickEvent", section)); 190} 191 192void 193AtomicSimpleCPU::resume() 194{ 195 if (_status == Idle || _status == SwitchedOut) 196 return; 197 198 DPRINTF(SimpleCPU, "Resume\n"); 199 assert(system->getMemoryMode() == Enums::atomic); 200 201 changeState(SimObject::Running); 202 if (thread->status() == ThreadContext::Active) { 203 if (!tickEvent.scheduled()) 204 schedule(tickEvent, nextCycle()); 205 } 206} 207 208void 209AtomicSimpleCPU::switchOut() 210{ 211 assert(_status == Running || _status == Idle); 212 _status = SwitchedOut; 213 214 tickEvent.squash(); 215} 216 217 218void 219AtomicSimpleCPU::takeOverFrom(BaseCPU *oldCPU) 220{ 221 BaseCPU::takeOverFrom(oldCPU, &icachePort, &dcachePort); 222 223 assert(!tickEvent.scheduled()); 224 225 // if any of this CPU's ThreadContexts are active, mark the CPU as 226 // running and schedule its tick event. 227 for (int i = 0; i < threadContexts.size(); ++i) { 228 ThreadContext *tc = threadContexts[i]; 229 if (tc->status() == ThreadContext::Active && _status != Running) { 230 _status = Running; 231 schedule(tickEvent, nextCycle()); 232 break; 233 } 234 } 235 if (_status != Running) { 236 _status = Idle; 237 } 238 assert(threadContexts.size() == 1); 239 ifetch_req.setThreadContext(_cpuId, 0); // Add thread ID if we add MT 240 data_read_req.setThreadContext(_cpuId, 0); // Add thread ID here too 241 data_write_req.setThreadContext(_cpuId, 0); // Add thread ID here too 242} 243 244 245void 246AtomicSimpleCPU::activateContext(int thread_num, int delay) 247{ 248 DPRINTF(SimpleCPU, "ActivateContext %d (%d cycles)\n", thread_num, delay); 249 250 assert(thread_num == 0); 251 assert(thread); 252 253 assert(_status == Idle); 254 assert(!tickEvent.scheduled()); 255 256 notIdleFraction++; 257 numCycles += tickToCycles(thread->lastActivate - thread->lastSuspend); 258 259 //Make sure ticks are still on multiples of cycles 260 schedule(tickEvent, nextCycle(curTick + ticks(delay))); 261 _status = Running; 262} 263 264 265void 266AtomicSimpleCPU::suspendContext(int thread_num) 267{ 268 DPRINTF(SimpleCPU, "SuspendContext %d\n", thread_num); 269 270 assert(thread_num == 0); 271 assert(thread); 272 273 assert(_status == Running); 274 275 // tick event may not be scheduled if this gets called from inside 276 // an instruction's execution, e.g. "quiesce" 277 if (tickEvent.scheduled()) 278 deschedule(tickEvent); 279 280 notIdleFraction--; 281 _status = Idle; 282} 283 284 285template <class T> 286Fault 287AtomicSimpleCPU::read(Addr addr, T &data, unsigned flags) 288{ 289 // use the CPU's statically allocated read request and packet objects 290 Request *req = &data_read_req; 291 292 if (traceData) { 293 traceData->setAddr(addr); 294 } 295 296 //The block size of our peer. 297 int blockSize = dcachePort.peerBlockSize(); 298 //The size of the data we're trying to read. 299 int dataSize = sizeof(T); 300 301 uint8_t * dataPtr = (uint8_t *)&data; 302 303 //The address of the second part of this access if it needs to be split 304 //across a cache line boundary. 305 Addr secondAddr = roundDown(addr + dataSize - 1, blockSize); 306 307 if(secondAddr > addr) 308 dataSize = secondAddr - addr; 309 310 dcache_latency = 0; 311 312 while(1) { 313 req->setVirt(0, addr, dataSize, flags, thread->readPC()); 314 315 // translate to physical address 316 Fault fault = thread->translateDataReadReq(req); 317 318 // Now do the access. 319 if (fault == NoFault) { 320 Packet pkt = Packet(req, 321 req->isLocked() ? MemCmd::LoadLockedReq : MemCmd::ReadReq, 322 Packet::Broadcast); 323 pkt.dataStatic(dataPtr); 324 325 if (req->isMmapedIpr()) 326 dcache_latency += TheISA::handleIprRead(thread->getTC(), &pkt); 327 else { 328 if (hasPhysMemPort && pkt.getAddr() == physMemAddr) 329 dcache_latency += physmemPort.sendAtomic(&pkt); 330 else 331 dcache_latency += dcachePort.sendAtomic(&pkt); 332 } 333 dcache_access = true; 334 335 assert(!pkt.isError()); 336 337 if (req->isLocked()) { 338 TheISA::handleLockedRead(thread, req); 339 } 340 } 341 342 // This will need a new way to tell if it has a dcache attached. 343 if (req->isUncacheable()) 344 recordEvent("Uncached Read"); 345 346 //If there's a fault, return it 347 if (fault != NoFault) 348 return fault; 349 //If we don't need to access a second cache line, stop now. 350 if (secondAddr <= addr) 351 { 352 data = gtoh(data); 353 if (traceData) { 354 traceData->setData(data); 355 } 356 return fault; 357 } 358 359 /* 360 * Set up for accessing the second cache line. 361 */ 362 363 //Move the pointer we're reading into to the correct location. 364 dataPtr += dataSize; 365 //Adjust the size to get the remaining bytes. 366 dataSize = addr + sizeof(T) - secondAddr; 367 //And access the right address. 368 addr = secondAddr; 369 } 370} 371 372Fault 373AtomicSimpleCPU::translateDataReadAddr(Addr vaddr, Addr & paddr, 374 int size, unsigned flags) 375{ 376 // use the CPU's statically allocated read request and packet objects 377 Request *req = &data_read_req; 378 379 if (traceData) { 380 traceData->setAddr(vaddr); 381 } 382 383 //The block size of our peer. 384 int blockSize = dcachePort.peerBlockSize(); 385 //The size of the data we're trying to read. 386 int dataSize = size; 387 388 bool firstTimeThrough = true; 389 390 //The address of the second part of this access if it needs to be split 391 //across a cache line boundary. 392 Addr secondAddr = roundDown(vaddr + dataSize - 1, blockSize); 393 394 if(secondAddr > vaddr) 395 dataSize = secondAddr - vaddr; 396 397 while(1) { 398 req->setVirt(0, vaddr, dataSize, flags, thread->readPC()); 399 400 // translate to physical address 401 Fault fault = thread->translateDataReadReq(req); 402 403 //If there's a fault, return it 404 if (fault != NoFault) 405 return fault; 406 407 if (firstTimeThrough) { 408 paddr = req->getPaddr(); 409 firstTimeThrough = false; 410 } 411 412 //If we don't need to access a second cache line, stop now. 413 if (secondAddr <= vaddr) 414 return fault; 415 416 /* 417 * Set up for accessing the second cache line. 418 */ 419 420 //Adjust the size to get the remaining bytes. 421 dataSize = vaddr + size - secondAddr; 422 //And access the right address. 423 vaddr = secondAddr; 424 } 425} 426 427#ifndef DOXYGEN_SHOULD_SKIP_THIS 428 429template 430Fault 431AtomicSimpleCPU::read(Addr addr, Twin32_t &data, unsigned flags); 432 433template 434Fault 435AtomicSimpleCPU::read(Addr addr, Twin64_t &data, unsigned flags); 436 437template 438Fault 439AtomicSimpleCPU::read(Addr addr, uint64_t &data, unsigned flags); 440 441template 442Fault 443AtomicSimpleCPU::read(Addr addr, uint32_t &data, unsigned flags); 444 445template 446Fault 447AtomicSimpleCPU::read(Addr addr, uint16_t &data, unsigned flags); 448 449template 450Fault 451AtomicSimpleCPU::read(Addr addr, uint8_t &data, unsigned flags); 452 453#endif //DOXYGEN_SHOULD_SKIP_THIS 454 455template<> 456Fault 457AtomicSimpleCPU::read(Addr addr, double &data, unsigned flags) 458{ 459 return read(addr, *(uint64_t*)&data, flags); 460} 461 462template<> 463Fault 464AtomicSimpleCPU::read(Addr addr, float &data, unsigned flags) 465{ 466 return read(addr, *(uint32_t*)&data, flags); 467} 468 469 470template<> 471Fault 472AtomicSimpleCPU::read(Addr addr, int32_t &data, unsigned flags) 473{ 474 return read(addr, (uint32_t&)data, flags); 475} 476 477 478template <class T> 479Fault 480AtomicSimpleCPU::write(T data, Addr addr, unsigned flags, uint64_t *res) 481{ 482 // use the CPU's statically allocated write request and packet objects 483 Request *req = &data_write_req; 484 485 if (traceData) { 486 traceData->setAddr(addr); 487 } 488 489 //The block size of our peer. 490 int blockSize = dcachePort.peerBlockSize(); 491 //The size of the data we're trying to read. 492 int dataSize = sizeof(T); 493 494 uint8_t * dataPtr = (uint8_t *)&data; 495 496 //The address of the second part of this access if it needs to be split 497 //across a cache line boundary. 498 Addr secondAddr = roundDown(addr + dataSize - 1, blockSize); 499 500 if(secondAddr > addr) 501 dataSize = secondAddr - addr; 502 503 dcache_latency = 0; 504 505 while(1) { 506 req->setVirt(0, addr, dataSize, flags, thread->readPC()); 507 508 // translate to physical address 509 Fault fault = thread->translateDataWriteReq(req); 510 511 // Now do the access. 512 if (fault == NoFault) { 513 MemCmd cmd = MemCmd::WriteReq; // default 514 bool do_access = true; // flag to suppress cache access 515 516 if (req->isLocked()) { 517 cmd = MemCmd::StoreCondReq; 518 do_access = TheISA::handleLockedWrite(thread, req); 519 } else if (req->isSwap()) { 520 cmd = MemCmd::SwapReq; 521 if (req->isCondSwap()) { 522 assert(res); 523 req->setExtraData(*res); 524 } 525 } 526 527 if (do_access) { 528 Packet pkt = Packet(req, cmd, Packet::Broadcast); 529 pkt.dataStatic(dataPtr); 530 531 if (req->isMmapedIpr()) { 532 dcache_latency += 533 TheISA::handleIprWrite(thread->getTC(), &pkt); 534 } else { 535 //XXX This needs to be outside of the loop in order to 536 //work properly for cache line boundary crossing 537 //accesses in transendian simulations. 538 data = htog(data); 539 if (hasPhysMemPort && pkt.getAddr() == physMemAddr) 540 dcache_latency += physmemPort.sendAtomic(&pkt); 541 else 542 dcache_latency += dcachePort.sendAtomic(&pkt); 543 } 544 dcache_access = true; 545 assert(!pkt.isError()); 546 547 if (req->isSwap()) { 548 assert(res); 549 *res = pkt.get<T>(); 550 } 551 } 552 553 if (res && !req->isSwap()) { 554 *res = req->getExtraData(); 555 } 556 } 557 558 // This will need a new way to tell if it's hooked up to a cache or not. 559 if (req->isUncacheable()) 560 recordEvent("Uncached Write"); 561 562 //If there's a fault or we don't need to access a second cache line, 563 //stop now. 564 if (fault != NoFault || secondAddr <= addr) 565 { 566 // If the write needs to have a fault on the access, consider 567 // calling changeStatus() and changing it to "bad addr write" 568 // or something. 569 if (traceData) { 570 traceData->setData(data); 571 } 572 return fault; 573 } 574 575 /* 576 * Set up for accessing the second cache line. 577 */ 578 579 //Move the pointer we're reading into to the correct location. 580 dataPtr += dataSize; 581 //Adjust the size to get the remaining bytes. 582 dataSize = addr + sizeof(T) - secondAddr; 583 //And access the right address. 584 addr = secondAddr; 585 } 586} 587 588Fault 589AtomicSimpleCPU::translateDataWriteAddr(Addr vaddr, Addr &paddr, 590 int size, unsigned flags) 591{ 592 // use the CPU's statically allocated write request and packet objects 593 Request *req = &data_write_req; 594 595 if (traceData) { 596 traceData->setAddr(vaddr); 597 } 598 599 //The block size of our peer. 600 int blockSize = dcachePort.peerBlockSize(); 601 602 //The address of the second part of this access if it needs to be split 603 //across a cache line boundary. 604 Addr secondAddr = roundDown(vaddr + size - 1, blockSize); 605 606 //The size of the data we're trying to read. 607 int dataSize = size; 608 609 bool firstTimeThrough = true; 610 611 if(secondAddr > vaddr) 612 dataSize = secondAddr - vaddr; 613 614 dcache_latency = 0; 615 616 while(1) { 617 req->setVirt(0, vaddr, dataSize, flags, thread->readPC()); 618 619 // translate to physical address 620 Fault fault = thread->translateDataWriteReq(req); 621 622 //If there's a fault or we don't need to access a second cache line, 623 //stop now. 624 if (fault != NoFault) 625 return fault; 626 627 if (firstTimeThrough) { 628 paddr = req->getPaddr(); 629 firstTimeThrough = false; 630 } 631 632 if (secondAddr <= vaddr) 633 return fault; 634 635 /* 636 * Set up for accessing the second cache line. 637 */ 638 639 //Adjust the size to get the remaining bytes. 640 dataSize = vaddr + size - secondAddr; 641 //And access the right address. 642 vaddr = secondAddr; 643 } 644} 645 646 647#ifndef DOXYGEN_SHOULD_SKIP_THIS 648 649template 650Fault 651AtomicSimpleCPU::write(Twin32_t data, Addr addr, 652 unsigned flags, uint64_t *res); 653 654template 655Fault 656AtomicSimpleCPU::write(Twin64_t data, Addr addr, 657 unsigned flags, uint64_t *res); 658 659template 660Fault 661AtomicSimpleCPU::write(uint64_t data, Addr addr, 662 unsigned flags, uint64_t *res); 663 664template 665Fault 666AtomicSimpleCPU::write(uint32_t data, Addr addr, 667 unsigned flags, uint64_t *res); 668 669template 670Fault 671AtomicSimpleCPU::write(uint16_t data, Addr addr, 672 unsigned flags, uint64_t *res); 673 674template 675Fault 676AtomicSimpleCPU::write(uint8_t data, Addr addr, 677 unsigned flags, uint64_t *res); 678 679#endif //DOXYGEN_SHOULD_SKIP_THIS 680 681template<> 682Fault 683AtomicSimpleCPU::write(double data, Addr addr, unsigned flags, uint64_t *res) 684{ 685 return write(*(uint64_t*)&data, addr, flags, res); 686} 687 688template<> 689Fault 690AtomicSimpleCPU::write(float data, Addr addr, unsigned flags, uint64_t *res) 691{ 692 return write(*(uint32_t*)&data, addr, flags, res); 693} 694 695 696template<> 697Fault 698AtomicSimpleCPU::write(int32_t data, Addr addr, unsigned flags, uint64_t *res) 699{ 700 return write((uint32_t)data, addr, flags, res); 701} 702 703 704void 705AtomicSimpleCPU::tick() 706{ 707 DPRINTF(SimpleCPU, "Tick\n"); 708 709 Tick latency = 0; 710 711 for (int i = 0; i < width; ++i) { 712 numCycles++; 713 714 if (!curStaticInst || !curStaticInst->isDelayedCommit()) 715 checkForInterrupts(); 716 717 checkPcEventQueue(); 718 719 Fault fault = NoFault; 720 721 bool fromRom = isRomMicroPC(thread->readMicroPC()); 722 if (!fromRom) 723 fault = setupFetchRequest(&ifetch_req); 724 725 if (fault == NoFault) { 726 Tick icache_latency = 0; 727 bool icache_access = false; 728 dcache_access = false; // assume no dcache access 729 730 if (!fromRom) { 731 // This is commented out because the predecoder would act like 732 // a tiny cache otherwise. It wouldn't be flushed when needed 733 // like the I cache. It should be flushed, and when that works 734 // this code should be uncommented. 735 //Fetch more instruction memory if necessary 736 //if(predecoder.needMoreBytes()) 737 //{ 738 icache_access = true; 739 Packet ifetch_pkt = Packet(&ifetch_req, MemCmd::ReadReq, 740 Packet::Broadcast); 741 ifetch_pkt.dataStatic(&inst); 742 743 if (hasPhysMemPort && ifetch_pkt.getAddr() == physMemAddr) 744 icache_latency = physmemPort.sendAtomic(&ifetch_pkt); 745 else 746 icache_latency = icachePort.sendAtomic(&ifetch_pkt); 747 748 assert(!ifetch_pkt.isError()); 749 750 // ifetch_req is initialized to read the instruction directly 751 // into the CPU object's inst field. 752 //} 753 } 754 755 preExecute(); 756 757 if (curStaticInst) { 758 fault = curStaticInst->execute(this, traceData); 759 760 // keep an instruction count 761 if (fault == NoFault) 762 countInst(); 763 else if (traceData) { 764 // If there was a fault, we should trace this instruction. 765 delete traceData; 766 traceData = NULL; 767 } 768 769 postExecute(); 770 } 771 772 // @todo remove me after debugging with legion done 773 if (curStaticInst && (!curStaticInst->isMicroop() || 774 curStaticInst->isFirstMicroop())) 775 instCnt++; 776 777 Tick stall_ticks = 0; 778 if (simulate_inst_stalls && icache_access) 779 stall_ticks += icache_latency; 780 781 if (simulate_data_stalls && dcache_access) 782 stall_ticks += dcache_latency; 783 784 if (stall_ticks) { 785 Tick stall_cycles = stall_ticks / ticks(1); 786 Tick aligned_stall_ticks = ticks(stall_cycles); 787 788 if (aligned_stall_ticks < stall_ticks) 789 aligned_stall_ticks += 1; 790 791 latency += aligned_stall_ticks; 792 } 793 794 } 795 if(fault != NoFault || !stayAtPC) 796 advancePC(fault); 797 } 798 799 // instruction takes at least one cycle 800 if (latency < ticks(1)) 801 latency = ticks(1); 802 803 if (_status != Idle) 804 schedule(tickEvent, curTick + latency); 805} 806 807 808void 809AtomicSimpleCPU::printAddr(Addr a) 810{ 811 dcachePort.printAddr(a); 812} 813 814 815//////////////////////////////////////////////////////////////////////// 816// 817// AtomicSimpleCPU Simulation Object 818// 819AtomicSimpleCPU * 820AtomicSimpleCPUParams::create() 821{ 822 numThreads = 1; 823#if !FULL_SYSTEM 824 if (workload.size() != 1) 825 panic("only one workload allowed"); 826#endif 827 return new AtomicSimpleCPU(this); 828} 829