base.cc revision 2671 
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/utility.hh"
32#include "base/cprintf.hh"
33#include "base/inifile.hh"
34#include "base/loader/symtab.hh"
35#include "base/misc.hh"
36#include "base/pollevent.hh"
37#include "base/range.hh"
38#include "base/stats/events.hh"
39#include "base/trace.hh"
40#include "cpu/base.hh"
41#include "cpu/cpu_exec_context.hh"
42#include "cpu/exec_context.hh"
43#include "cpu/exetrace.hh"
44#include "cpu/profile.hh"
45#include "cpu/sampler/sampler.hh"
46#include "cpu/simple/base.hh"
47#include "cpu/smt.hh"
48#include "cpu/static_inst.hh"
49#include "kern/kernel_stats.hh"
50#include "mem/packet_impl.hh"
51#include "sim/byteswap.hh"
52#include "sim/builder.hh"
53#include "sim/debug.hh"
54#include "sim/host.hh"
55#include "sim/sim_events.hh"
56#include "sim/sim_object.hh"
57#include "sim/stats.hh"
58
59#if FULL_SYSTEM
60#include "base/remote_gdb.hh"
61#include "sim/system.hh"
62#include "arch/tlb.hh"
63#include "arch/stacktrace.hh"
64#include "arch/vtophys.hh"
65#else // !FULL_SYSTEM
66#include "mem/mem_object.hh"
67#endif // FULL_SYSTEM
68
69using namespace std;
70using namespace TheISA;
71
72BaseSimpleCPU::BaseSimpleCPU(Params *p)
73    : BaseCPU(p), mem(p->mem), cpuXC(NULL)
74{
75#if FULL_SYSTEM
76    cpuXC = new CPUExecContext(this, 0, p->system, p->itb, p->dtb);
77#else
78    cpuXC = new CPUExecContext(this, /* thread_num */ 0, p->process,
79            /* asid */ 0, mem);
80#endif // !FULL_SYSTEM
81
82    xcProxy = cpuXC->getProxy();
83
84    numInst = 0;
85    startNumInst = 0;
86    numLoad = 0;
87    startNumLoad = 0;
88    lastIcacheStall = 0;
89    lastDcacheStall = 0;
90
91    execContexts.push_back(xcProxy);
92}
93
94BaseSimpleCPU::~BaseSimpleCPU()
95{
96}
97
98void
99BaseSimpleCPU::deallocateContext(int thread_num)
100{
101    // for now, these are equivalent
102    suspendContext(thread_num);
103}
104
105
106void
107BaseSimpleCPU::haltContext(int thread_num)
108{
109    // for now, these are equivalent
110    suspendContext(thread_num);
111}
112
113
114void
115BaseSimpleCPU::regStats()
116{
117    using namespace Stats;
118
119    BaseCPU::regStats();
120
121    numInsts
122        .name(name() + ".num_insts")
123        .desc("Number of instructions executed")
124        ;
125
126    numMemRefs
127        .name(name() + ".num_refs")
128        .desc("Number of memory references")
129        ;
130
131    notIdleFraction
132        .name(name() + ".not_idle_fraction")
133        .desc("Percentage of non-idle cycles")
134        ;
135
136    idleFraction
137        .name(name() + ".idle_fraction")
138        .desc("Percentage of idle cycles")
139        ;
140
141    icacheStallCycles
142        .name(name() + ".icache_stall_cycles")
143        .desc("ICache total stall cycles")
144        .prereq(icacheStallCycles)
145        ;
146
147    dcacheStallCycles
148        .name(name() + ".dcache_stall_cycles")
149        .desc("DCache total stall cycles")
150        .prereq(dcacheStallCycles)
151        ;
152
153    icacheRetryCycles
154        .name(name() + ".icache_retry_cycles")
155        .desc("ICache total retry cycles")
156        .prereq(icacheRetryCycles)
157        ;
158
159    dcacheRetryCycles
160        .name(name() + ".dcache_retry_cycles")
161        .desc("DCache total retry cycles")
162        .prereq(dcacheRetryCycles)
163        ;
164
165    idleFraction = constant(1.0) - notIdleFraction;
166}
167
168void
169BaseSimpleCPU::resetStats()
170{
171    startNumInst = numInst;
172    // notIdleFraction = (_status != Idle);
173}
174
175void
176BaseSimpleCPU::serialize(ostream &os)
177{
178    BaseCPU::serialize(os);
179    SERIALIZE_SCALAR(inst);
180    nameOut(os, csprintf("%s.xc", name()));
181    cpuXC->serialize(os);
182}
183
184void
185BaseSimpleCPU::unserialize(Checkpoint *cp, const string &section)
186{
187    BaseCPU::unserialize(cp, section);
188    UNSERIALIZE_SCALAR(inst);
189    cpuXC->unserialize(cp, csprintf("%s.xc", section));
190}
191
192void
193change_thread_state(int thread_number, int activate, int priority)
194{
195}
196
197Fault
198BaseSimpleCPU::copySrcTranslate(Addr src)
199{
200#if 0
201    static bool no_warn = true;
202    int blk_size = (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
203    // Only support block sizes of 64 atm.
204    assert(blk_size == 64);
205    int offset = src & (blk_size - 1);
206
207    // Make sure block doesn't span page
208    if (no_warn &&
209        (src & PageMask) != ((src + blk_size) & PageMask) &&
210        (src >> 40) != 0xfffffc) {
211        warn("Copied block source spans pages %x.", src);
212        no_warn = false;
213    }
214
215    memReq->reset(src & ~(blk_size - 1), blk_size);
216
217    // translate to physical address
218    Fault fault = cpuXC->translateDataReadReq(req);
219
220    if (fault == NoFault) {
221        cpuXC->copySrcAddr = src;
222        cpuXC->copySrcPhysAddr = memReq->paddr + offset;
223    } else {
224        assert(!fault->isAlignmentFault());
225
226        cpuXC->copySrcAddr = 0;
227        cpuXC->copySrcPhysAddr = 0;
228    }
229    return fault;
230#else
231    return NoFault;
232#endif
233}
234
235Fault
236BaseSimpleCPU::copy(Addr dest)
237{
238#if 0
239    static bool no_warn = true;
240    int blk_size = (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
241    // Only support block sizes of 64 atm.
242    assert(blk_size == 64);
243    uint8_t data[blk_size];
244    //assert(cpuXC->copySrcAddr);
245    int offset = dest & (blk_size - 1);
246
247    // Make sure block doesn't span page
248    if (no_warn &&
249        (dest & PageMask) != ((dest + blk_size) & PageMask) &&
250        (dest >> 40) != 0xfffffc) {
251        no_warn = false;
252        warn("Copied block destination spans pages %x. ", dest);
253    }
254
255    memReq->reset(dest & ~(blk_size -1), blk_size);
256    // translate to physical address
257    Fault fault = cpuXC->translateDataWriteReq(req);
258
259    if (fault == NoFault) {
260        Addr dest_addr = memReq->paddr + offset;
261        // Need to read straight from memory since we have more than 8 bytes.
262        memReq->paddr = cpuXC->copySrcPhysAddr;
263        cpuXC->mem->read(memReq, data);
264        memReq->paddr = dest_addr;
265        cpuXC->mem->write(memReq, data);
266        if (dcacheInterface) {
267            memReq->cmd = Copy;
268            memReq->completionEvent = NULL;
269            memReq->paddr = cpuXC->copySrcPhysAddr;
270            memReq->dest = dest_addr;
271            memReq->size = 64;
272            memReq->time = curTick;
273            memReq->flags &= ~INST_READ;
274            dcacheInterface->access(memReq);
275        }
276    }
277    else
278        assert(!fault->isAlignmentFault());
279
280    return fault;
281#else
282    panic("copy not implemented");
283    return NoFault;
284#endif
285}
286
287#if FULL_SYSTEM
288Addr
289BaseSimpleCPU::dbg_vtophys(Addr addr)
290{
291    return vtophys(xcProxy, addr);
292}
293#endif // FULL_SYSTEM
294
295#if FULL_SYSTEM
296void
297BaseSimpleCPU::post_interrupt(int int_num, int index)
298{
299    BaseCPU::post_interrupt(int_num, index);
300
301    if (cpuXC->status() == ExecContext::Suspended) {
302                DPRINTF(IPI,"Suspended Processor awoke\n");
303        cpuXC->activate();
304    }
305}
306#endif // FULL_SYSTEM
307
308void
309BaseSimpleCPU::checkForInterrupts()
310{
311#if FULL_SYSTEM
312    if (checkInterrupts && check_interrupts() && !cpuXC->inPalMode()) {
313        int ipl = 0;
314        int summary = 0;
315        checkInterrupts = false;
316
317        if (cpuXC->readMiscReg(IPR_SIRR)) {
318            for (int i = INTLEVEL_SOFTWARE_MIN;
319                 i < INTLEVEL_SOFTWARE_MAX; i++) {
320                if (cpuXC->readMiscReg(IPR_SIRR) & (ULL(1) << i)) {
321                    // See table 4-19 of 21164 hardware reference
322                    ipl = (i - INTLEVEL_SOFTWARE_MIN) + 1;
323                    summary |= (ULL(1) << i);
324                }
325            }
326        }
327
328        uint64_t interrupts = cpuXC->cpu->intr_status();
329        for (int i = INTLEVEL_EXTERNAL_MIN;
330            i < INTLEVEL_EXTERNAL_MAX; i++) {
331            if (interrupts & (ULL(1) << i)) {
332                // See table 4-19 of 21164 hardware reference
333                ipl = i;
334                summary |= (ULL(1) << i);
335            }
336        }
337
338        if (cpuXC->readMiscReg(IPR_ASTRR))
339            panic("asynchronous traps not implemented\n");
340
341        if (ipl && ipl > cpuXC->readMiscReg(IPR_IPLR)) {
342            cpuXC->setMiscReg(IPR_ISR, summary);
343            cpuXC->setMiscReg(IPR_INTID, ipl);
344
345            Fault(new InterruptFault)->invoke(xcProxy);
346
347            DPRINTF(Flow, "Interrupt! IPLR=%d ipl=%d summary=%x\n",
348                    cpuXC->readMiscReg(IPR_IPLR), ipl, summary);
349        }
350    }
351#endif
352}
353
354
355Fault
356BaseSimpleCPU::setupFetchRequest(Request *req)
357{
358    // set up memory request for instruction fetch
359    DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p NNPC:%08p\n",cpuXC->readPC(),
360            cpuXC->readNextPC(),cpuXC->readNextNPC());
361
362    req->setVirt(0, cpuXC->readPC() & ~3, sizeof(MachInst),
363                 (FULL_SYSTEM && (cpuXC->readPC() & 1)) ? PHYSICAL : 0,
364                 cpuXC->readPC());
365
366    Fault fault = cpuXC->translateInstReq(req);
367
368    return fault;
369}
370
371
372void
373BaseSimpleCPU::preExecute()
374{
375    // maintain $r0 semantics
376    cpuXC->setIntReg(ZeroReg, 0);
377#if THE_ISA == ALPHA_ISA
378    cpuXC->setFloatReg(ZeroReg, 0.0);
379#endif // ALPHA_ISA
380
381    // keep an instruction count
382    numInst++;
383    numInsts++;
384
385    cpuXC->func_exe_inst++;
386
387    // check for instruction-count-based events
388    comInstEventQueue[0]->serviceEvents(numInst);
389
390    // decode the instruction
391    inst = gtoh(inst);
392    curStaticInst = StaticInst::decode(makeExtMI(inst, cpuXC->readPC()));
393
394    traceData = Trace::getInstRecord(curTick, xcProxy, this, curStaticInst,
395                                     cpuXC->readPC());
396
397    DPRINTF(Decode,"Decode: Decoded %s instruction (opcode: 0x%x): 0x%x\n",
398            curStaticInst->getName(), curStaticInst->getOpcode(),
399            curStaticInst->machInst);
400
401#if FULL_SYSTEM
402    cpuXC->setInst(inst);
403#endif // FULL_SYSTEM
404}
405
406void
407BaseSimpleCPU::postExecute()
408{
409#if FULL_SYSTEM
410    if (system->kernelBinning->fnbin) {
411        assert(cpuXC->getKernelStats());
412        system->kernelBinning->execute(xcProxy, inst);
413    }
414
415    if (cpuXC->profile) {
416        bool usermode =
417            (cpuXC->readMiscReg(AlphaISA::IPR_DTB_CM) & 0x18) != 0;
418        cpuXC->profilePC = usermode ? 1 : cpuXC->readPC();
419        ProfileNode *node = cpuXC->profile->consume(xcProxy, inst);
420        if (node)
421            cpuXC->profileNode = node;
422    }
423#endif
424
425    if (curStaticInst->isMemRef()) {
426        numMemRefs++;
427    }
428
429    if (curStaticInst->isLoad()) {
430        ++numLoad;
431        comLoadEventQueue[0]->serviceEvents(numLoad);
432    }
433
434    traceFunctions(cpuXC->readPC());
435
436    if (traceData) {
437        traceData->finalize();
438    }
439}
440
441
442void
443BaseSimpleCPU::advancePC(Fault fault)
444{
445    if (fault != NoFault) {
446#if FULL_SYSTEM
447        fault->invoke(xcProxy);
448#else // !FULL_SYSTEM
449        fatal("fault (%s) detected @ PC %08p", fault->name(), cpuXC->readPC());
450#endif // FULL_SYSTEM
451    }
452    else {
453        // go to the next instruction
454        cpuXC->setPC(cpuXC->readNextPC());
455#if THE_ISA == ALPHA_ISA
456        cpuXC->setNextPC(cpuXC->readNextPC() + sizeof(MachInst));
457#else
458        cpuXC->setNextPC(cpuXC->readNextNPC());
459        cpuXC->setNextNPC(cpuXC->readNextNPC() + sizeof(MachInst));
460#endif
461
462    }
463
464#if FULL_SYSTEM
465    Addr oldpc;
466    do {
467        oldpc = cpuXC->readPC();
468        system->pcEventQueue.service(xcProxy);
469    } while (oldpc != cpuXC->readPC());
470#endif
471}
472
473