base.cc revision 7678 
1/*
2 * Copyright (c) 2010 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) 2002-2005 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Steve Reinhardt
41 */
42
43#include "arch/faults.hh"
44#include "arch/utility.hh"
45#include "base/cp_annotate.hh"
46#include "base/cprintf.hh"
47#include "base/inifile.hh"
48#include "base/loader/symtab.hh"
49#include "base/misc.hh"
50#include "base/pollevent.hh"
51#include "base/range.hh"
52#include "base/trace.hh"
53#include "base/types.hh"
54#include "config/the_isa.hh"
55#include "cpu/base.hh"
56#include "cpu/exetrace.hh"
57#include "cpu/profile.hh"
58#include "cpu/simple/base.hh"
59#include "cpu/simple_thread.hh"
60#include "cpu/smt.hh"
61#include "cpu/static_inst.hh"
62#include "cpu/thread_context.hh"
63#include "mem/packet.hh"
64#include "mem/request.hh"
65#include "params/BaseSimpleCPU.hh"
66#include "sim/byteswap.hh"
67#include "sim/debug.hh"
68#include "sim/sim_events.hh"
69#include "sim/sim_object.hh"
70#include "sim/stats.hh"
71#include "sim/system.hh"
72
73#if FULL_SYSTEM
74#include "arch/kernel_stats.hh"
75#include "arch/stacktrace.hh"
76#include "arch/tlb.hh"
77#include "arch/vtophys.hh"
78#else // !FULL_SYSTEM
79#include "mem/mem_object.hh"
80#endif // FULL_SYSTEM
81
82using namespace std;
83using namespace TheISA;
84
85BaseSimpleCPU::BaseSimpleCPU(BaseSimpleCPUParams *p)
86    : BaseCPU(p), traceData(NULL), thread(NULL), predecoder(NULL)
87{
88#if FULL_SYSTEM
89    thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb);
90#else
91    thread = new SimpleThread(this, /* thread_num */ 0, p->workload[0],
92            p->itb, p->dtb);
93#endif // !FULL_SYSTEM
94
95    thread->setStatus(ThreadContext::Halted);
96
97    tc = thread->getTC();
98
99    numInst = 0;
100    startNumInst = 0;
101    numLoad = 0;
102    startNumLoad = 0;
103    lastIcacheStall = 0;
104    lastDcacheStall = 0;
105
106    threadContexts.push_back(tc);
107
108
109    fetchOffset = 0;
110    stayAtPC = false;
111}
112
113BaseSimpleCPU::~BaseSimpleCPU()
114{
115}
116
117void
118BaseSimpleCPU::deallocateContext(int thread_num)
119{
120    // for now, these are equivalent
121    suspendContext(thread_num);
122}
123
124
125void
126BaseSimpleCPU::haltContext(int thread_num)
127{
128    // for now, these are equivalent
129    suspendContext(thread_num);
130}
131
132
133void
134BaseSimpleCPU::regStats()
135{
136    using namespace Stats;
137
138    BaseCPU::regStats();
139
140    numInsts
141        .name(name() + ".num_insts")
142        .desc("Number of instructions executed")
143        ;
144
145    numMemRefs
146        .name(name() + ".num_refs")
147        .desc("Number of memory references")
148        ;
149
150    notIdleFraction
151        .name(name() + ".not_idle_fraction")
152        .desc("Percentage of non-idle cycles")
153        ;
154
155    idleFraction
156        .name(name() + ".idle_fraction")
157        .desc("Percentage of idle cycles")
158        ;
159
160    icacheStallCycles
161        .name(name() + ".icache_stall_cycles")
162        .desc("ICache total stall cycles")
163        .prereq(icacheStallCycles)
164        ;
165
166    dcacheStallCycles
167        .name(name() + ".dcache_stall_cycles")
168        .desc("DCache total stall cycles")
169        .prereq(dcacheStallCycles)
170        ;
171
172    icacheRetryCycles
173        .name(name() + ".icache_retry_cycles")
174        .desc("ICache total retry cycles")
175        .prereq(icacheRetryCycles)
176        ;
177
178    dcacheRetryCycles
179        .name(name() + ".dcache_retry_cycles")
180        .desc("DCache total retry cycles")
181        .prereq(dcacheRetryCycles)
182        ;
183
184    idleFraction = constant(1.0) - notIdleFraction;
185}
186
187void
188BaseSimpleCPU::resetStats()
189{
190//    startNumInst = numInst;
191     notIdleFraction = (_status != Idle);
192}
193
194void
195BaseSimpleCPU::serialize(ostream &os)
196{
197    SERIALIZE_ENUM(_status);
198    BaseCPU::serialize(os);
199//    SERIALIZE_SCALAR(inst);
200    nameOut(os, csprintf("%s.xc.0", name()));
201    thread->serialize(os);
202}
203
204void
205BaseSimpleCPU::unserialize(Checkpoint *cp, const string &section)
206{
207    UNSERIALIZE_ENUM(_status);
208    BaseCPU::unserialize(cp, section);
209//    UNSERIALIZE_SCALAR(inst);
210    thread->unserialize(cp, csprintf("%s.xc.0", section));
211}
212
213void
214change_thread_state(ThreadID tid, int activate, int priority)
215{
216}
217
218void
219BaseSimpleCPU::prefetch(Addr addr, unsigned flags)
220{
221    if (traceData) {
222        traceData->setAddr(addr);
223    }
224
225    // need to do this...
226}
227
228void
229BaseSimpleCPU::writeHint(Addr addr, int size, unsigned flags)
230{
231    if (traceData) {
232        traceData->setAddr(addr);
233    }
234
235    // need to do this...
236}
237
238
239Fault
240BaseSimpleCPU::copySrcTranslate(Addr src)
241{
242#if 0
243    static bool no_warn = true;
244    unsigned blk_size =
245        (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
246    // Only support block sizes of 64 atm.
247    assert(blk_size == 64);
248    int offset = src & (blk_size - 1);
249
250    // Make sure block doesn't span page
251    if (no_warn &&
252        (src & PageMask) != ((src + blk_size) & PageMask) &&
253        (src >> 40) != 0xfffffc) {
254        warn("Copied block source spans pages %x.", src);
255        no_warn = false;
256    }
257
258    memReq->reset(src & ~(blk_size - 1), blk_size);
259
260    // translate to physical address
261    Fault fault = thread->translateDataReadReq(req);
262
263    if (fault == NoFault) {
264        thread->copySrcAddr = src;
265        thread->copySrcPhysAddr = memReq->paddr + offset;
266    } else {
267        assert(!fault->isAlignmentFault());
268
269        thread->copySrcAddr = 0;
270        thread->copySrcPhysAddr = 0;
271    }
272    return fault;
273#else
274    return NoFault;
275#endif
276}
277
278Fault
279BaseSimpleCPU::copy(Addr dest)
280{
281#if 0
282    static bool no_warn = true;
283    unsigned blk_size =
284        (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
285    // Only support block sizes of 64 atm.
286    assert(blk_size == 64);
287    uint8_t data[blk_size];
288    //assert(thread->copySrcAddr);
289    int offset = dest & (blk_size - 1);
290
291    // Make sure block doesn't span page
292    if (no_warn &&
293        (dest & PageMask) != ((dest + blk_size) & PageMask) &&
294        (dest >> 40) != 0xfffffc) {
295        no_warn = false;
296        warn("Copied block destination spans pages %x. ", dest);
297    }
298
299    memReq->reset(dest & ~(blk_size -1), blk_size);
300    // translate to physical address
301    Fault fault = thread->translateDataWriteReq(req);
302
303    if (fault == NoFault) {
304        Addr dest_addr = memReq->paddr + offset;
305        // Need to read straight from memory since we have more than 8 bytes.
306        memReq->paddr = thread->copySrcPhysAddr;
307        thread->mem->read(memReq, data);
308        memReq->paddr = dest_addr;
309        thread->mem->write(memReq, data);
310        if (dcacheInterface) {
311            memReq->cmd = Copy;
312            memReq->completionEvent = NULL;
313            memReq->paddr = thread->copySrcPhysAddr;
314            memReq->dest = dest_addr;
315            memReq->size = 64;
316            memReq->time = curTick;
317            dcacheInterface->access(memReq);
318        }
319    }
320    else
321        assert(!fault->isAlignmentFault());
322
323    return fault;
324#else
325    panic("copy not implemented");
326    return NoFault;
327#endif
328}
329
330#if FULL_SYSTEM
331Addr
332BaseSimpleCPU::dbg_vtophys(Addr addr)
333{
334    return vtophys(tc, addr);
335}
336#endif // FULL_SYSTEM
337
338#if FULL_SYSTEM
339void
340BaseSimpleCPU::wakeup()
341{
342    if (thread->status() != ThreadContext::Suspended)
343        return;
344
345    DPRINTF(Quiesce,"Suspended Processor awoke\n");
346    thread->activate();
347}
348#endif // FULL_SYSTEM
349
350void
351BaseSimpleCPU::checkForInterrupts()
352{
353#if FULL_SYSTEM
354    if (checkInterrupts(tc)) {
355        Fault interrupt = interrupts->getInterrupt(tc);
356
357        if (interrupt != NoFault) {
358            fetchOffset = 0;
359            interrupts->updateIntrInfo(tc);
360            interrupt->invoke(tc);
361            predecoder.reset();
362        }
363    }
364#endif
365}
366
367
368void
369BaseSimpleCPU::setupFetchRequest(Request *req)
370{
371    Addr threadPC = thread->readPC();
372
373    // set up memory request for instruction fetch
374#if ISA_HAS_DELAY_SLOT
375    DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p NNPC:%08p\n",threadPC,
376            thread->readNextPC(),thread->readNextNPC());
377#else
378    DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p\n",threadPC,
379            thread->readNextPC());
380#endif
381
382    Addr fetchPC = (threadPC & PCMask) + fetchOffset;
383    req->setVirt(0, fetchPC, sizeof(MachInst), Request::INST_FETCH, threadPC);
384}
385
386
387void
388BaseSimpleCPU::preExecute()
389{
390    // maintain $r0 semantics
391    thread->setIntReg(ZeroReg, 0);
392#if THE_ISA == ALPHA_ISA
393    thread->setFloatReg(ZeroReg, 0.0);
394#endif // ALPHA_ISA
395
396    // check for instruction-count-based events
397    comInstEventQueue[0]->serviceEvents(numInst);
398
399    // decode the instruction
400    inst = gtoh(inst);
401
402    MicroPC upc = thread->readMicroPC();
403
404    if (isRomMicroPC(upc)) {
405        stayAtPC = false;
406        curStaticInst = microcodeRom.fetchMicroop(upc, curMacroStaticInst);
407    } else if (!curMacroStaticInst) {
408        //We're not in the middle of a macro instruction
409        StaticInstPtr instPtr = NULL;
410
411        //Predecode, ie bundle up an ExtMachInst
412        //This should go away once the constructor can be set up properly
413        predecoder.setTC(thread->getTC());
414        //If more fetch data is needed, pass it in.
415        Addr fetchPC = (thread->readPC() & PCMask) + fetchOffset;
416        //if(predecoder.needMoreBytes())
417            predecoder.moreBytes(thread->readPC(), fetchPC, inst);
418        //else
419        //    predecoder.process();
420
421        //If an instruction is ready, decode it. Otherwise, we'll have to
422        //fetch beyond the MachInst at the current pc.
423        if (predecoder.extMachInstReady()) {
424#if THE_ISA == X86_ISA || THE_ISA == ARM_ISA
425            thread->setNextPC(thread->readPC() + predecoder.getInstSize());
426#endif // X86_ISA
427            stayAtPC = false;
428            instPtr = StaticInst::decode(predecoder.getExtMachInst(),
429                                         thread->readPC());
430        } else {
431            stayAtPC = true;
432            fetchOffset += sizeof(MachInst);
433        }
434
435        //If we decoded an instruction and it's microcoded, start pulling
436        //out micro ops
437        if (instPtr && instPtr->isMacroop()) {
438            curMacroStaticInst = instPtr;
439            curStaticInst = curMacroStaticInst->fetchMicroop(upc);
440        } else {
441            curStaticInst = instPtr;
442        }
443    } else {
444        //Read the next micro op from the macro op
445        curStaticInst = curMacroStaticInst->fetchMicroop(upc);
446    }
447
448    //If we decoded an instruction this "tick", record information about it.
449    if(curStaticInst)
450    {
451#if TRACING_ON
452        traceData = tracer->getInstRecord(curTick, tc,
453                curStaticInst, thread->readPC(),
454                curMacroStaticInst, thread->readMicroPC());
455
456        DPRINTF(Decode,"Decode: Decoded %s instruction: 0x%x\n",
457                curStaticInst->getName(), curStaticInst->machInst);
458#endif // TRACING_ON
459
460#if FULL_SYSTEM
461        thread->setInst(inst);
462#endif // FULL_SYSTEM
463    }
464}
465
466void
467BaseSimpleCPU::postExecute()
468{
469#if FULL_SYSTEM
470    if (thread->profile && curStaticInst) {
471        bool usermode = TheISA::inUserMode(tc);
472        thread->profilePC = usermode ? 1 : thread->readPC();
473        ProfileNode *node = thread->profile->consume(tc, curStaticInst);
474        if (node)
475            thread->profileNode = node;
476    }
477#endif
478
479    if (curStaticInst->isMemRef()) {
480        numMemRefs++;
481    }
482
483    if (curStaticInst->isLoad()) {
484        ++numLoad;
485        comLoadEventQueue[0]->serviceEvents(numLoad);
486    }
487
488    if (CPA::available()) {
489        CPA::cpa()->swAutoBegin(tc, thread->readNextPC());
490    }
491
492    traceFunctions(thread->readPC());
493
494    if (traceData) {
495        traceData->dump();
496        delete traceData;
497        traceData = NULL;
498    }
499}
500
501
502void
503BaseSimpleCPU::advancePC(Fault fault)
504{
505    //Since we're moving to a new pc, zero out the offset
506    fetchOffset = 0;
507    if (fault != NoFault) {
508        curMacroStaticInst = StaticInst::nullStaticInstPtr;
509        fault->invoke(tc, curStaticInst);
510        predecoder.reset();
511    } else {
512        //If we're at the last micro op for this instruction
513        if (curStaticInst && curStaticInst->isLastMicroop()) {
514            //We should be working with a macro op or be in the ROM
515            assert(curMacroStaticInst ||
516                    isRomMicroPC(thread->readMicroPC()));
517            //Close out this macro op, and clean up the
518            //microcode state
519            curMacroStaticInst = StaticInst::nullStaticInstPtr;
520            thread->setMicroPC(normalMicroPC(0));
521            thread->setNextMicroPC(normalMicroPC(1));
522        }
523        //If we're still in a macro op
524        if (curMacroStaticInst || isRomMicroPC(thread->readMicroPC())) {
525            //Advance the micro pc
526            thread->setMicroPC(thread->readNextMicroPC());
527            //Advance the "next" micro pc. Note that there are no delay
528            //slots, and micro ops are "word" addressed.
529            thread->setNextMicroPC(thread->readNextMicroPC() + 1);
530        } else {
531            // go to the next instruction
532            thread->setPC(thread->readNextPC());
533            thread->setNextPC(thread->readNextNPC());
534            thread->setNextNPC(thread->readNextNPC() + sizeof(MachInst));
535            assert(thread->readNextPC() != thread->readNextNPC());
536        }
537    }
538}
539
540/*Fault
541BaseSimpleCPU::CacheOp(uint8_t Op, Addr EffAddr)
542{
543    // translate to physical address
544    Fault fault = NoFault;
545    int CacheID = Op & 0x3; // Lower 3 bits identify Cache
546    int CacheOP = Op >> 2; // Upper 3 bits identify Cache Operation
547    if(CacheID > 1)
548      {
549        warn("CacheOps not implemented for secondary/tertiary caches\n");
550      }
551    else
552      {
553        switch(CacheOP)
554          { // Fill Packet Type
555          case 0: warn("Invalidate Cache Op\n");
556            break;
557          case 1: warn("Index Load Tag Cache Op\n");
558            break;
559          case 2: warn("Index Store Tag Cache Op\n");
560            break;
561          case 4: warn("Hit Invalidate Cache Op\n");
562            break;
563          case 5: warn("Fill/Hit Writeback Invalidate Cache Op\n");
564            break;
565          case 6: warn("Hit Writeback\n");
566            break;
567          case 7: warn("Fetch & Lock Cache Op\n");
568            break;
569          default: warn("Unimplemented Cache Op\n");
570          }
571      }
572    return fault;
573}*/
574