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, tc->contextId());
88 }
89#endif
90 if (hasPhysMemPort) {
91 bool snoop = false;
92 AddrRangeList pmAddrList;
93 physmemPort.getPeerAddressRanges(pmAddrList, snoop);
94 physMemAddr = *pmAddrList.begin();
95 }
96 // Atomic doesn't do MT right now, so contextId == threadId
97 ifetch_req.setThreadContext(_cpuId, 0); // Add thread ID if we add MT
98 data_read_req.setThreadContext(_cpuId, 0); // Add thread ID here too
99 data_write_req.setThreadContext(_cpuId, 0); // Add thread ID here too
100}
101
102bool
103AtomicSimpleCPU::CpuPort::recvTiming(PacketPtr pkt)
104{
105 panic("AtomicSimpleCPU doesn't expect recvTiming callback!");
106 return true;
107}
108
109Tick
110AtomicSimpleCPU::CpuPort::recvAtomic(PacketPtr pkt)
111{
112 //Snooping a coherence request, just return
113 return 0;
114}
115
116void
117AtomicSimpleCPU::CpuPort::recvFunctional(PacketPtr pkt)
118{
119 //No internal storage to update, just return
120 return;
121}
122
123void
124AtomicSimpleCPU::CpuPort::recvStatusChange(Status status)
125{
126 if (status == RangeChange) {
127 if (!snoopRangeSent) {
128 snoopRangeSent = true;
129 sendStatusChange(Port::RangeChange);
130 }
131 return;
132 }
133
134 panic("AtomicSimpleCPU doesn't expect recvStatusChange callback!");
135}
136
137void
138AtomicSimpleCPU::CpuPort::recvRetry()
139{
140 panic("AtomicSimpleCPU doesn't expect recvRetry callback!");
141}
142
143void
144AtomicSimpleCPU::DcachePort::setPeer(Port *port)
145{
146 Port::setPeer(port);
147
148#if FULL_SYSTEM
149 // Update the ThreadContext's memory ports (Functional/Virtual
150 // Ports)
151 cpu->tcBase()->connectMemPorts(cpu->tcBase());
152#endif
153}
154
155AtomicSimpleCPU::AtomicSimpleCPU(AtomicSimpleCPUParams *p)
156 : BaseSimpleCPU(p), tickEvent(this), width(p->width),
157 simulate_data_stalls(p->simulate_data_stalls),
158 simulate_inst_stalls(p->simulate_inst_stalls),
159 icachePort(name() + "-iport", this), dcachePort(name() + "-iport", this),
160 physmemPort(name() + "-iport", this), hasPhysMemPort(false)
161{
162 _status = Idle;
163
164 icachePort.snoopRangeSent = false;
165 dcachePort.snoopRangeSent = false;
166
167}
168
169
170AtomicSimpleCPU::~AtomicSimpleCPU()
171{
172}
173
174void
175AtomicSimpleCPU::serialize(ostream &os)
176{
177 SimObject::State so_state = SimObject::getState();
178 SERIALIZE_ENUM(so_state);
179 BaseSimpleCPU::serialize(os);
180 nameOut(os, csprintf("%s.tickEvent", name()));
181 tickEvent.serialize(os);
182}
183
184void
185AtomicSimpleCPU::unserialize(Checkpoint *cp, const string §ion)
186{
187 SimObject::State so_state;
188 UNSERIALIZE_ENUM(so_state);
189 BaseSimpleCPU::unserialize(cp, section);
190 tickEvent.unserialize(cp, csprintf("%s.tickEvent", section));
191}
192
193void
194AtomicSimpleCPU::resume()
195{
196 if (_status == Idle || _status == SwitchedOut)
197 return;
198
199 DPRINTF(SimpleCPU, "Resume\n");
200 assert(system->getMemoryMode() == Enums::atomic);
201
202 changeState(SimObject::Running);
203 if (thread->status() == ThreadContext::Active) {
204 if (!tickEvent.scheduled())
205 schedule(tickEvent, nextCycle());
206 }
207}
208
209void
210AtomicSimpleCPU::switchOut()
211{
212 assert(_status == Running || _status == Idle);
213 _status = SwitchedOut;
214
215 tickEvent.squash();
216}
217
218
219void
220AtomicSimpleCPU::takeOverFrom(BaseCPU *oldCPU)
221{
222 BaseCPU::takeOverFrom(oldCPU, &icachePort, &dcachePort);
223
224 assert(!tickEvent.scheduled());
225
226 // if any of this CPU's ThreadContexts are active, mark the CPU as
227 // running and schedule its tick event.
228 for (int i = 0; i < threadContexts.size(); ++i) {
229 ThreadContext *tc = threadContexts[i];
230 if (tc->status() == ThreadContext::Active && _status != Running) {
231 _status = Running;
232 schedule(tickEvent, nextCycle());
233 break;
234 }
235 }
236 if (_status != Running) {
237 _status = Idle;
238 }
239 assert(threadContexts.size() == 1);
240 ifetch_req.setThreadContext(_cpuId, 0); // Add thread ID if we add MT
241 data_read_req.setThreadContext(_cpuId, 0); // Add thread ID here too
242 data_write_req.setThreadContext(_cpuId, 0); // Add thread ID here too
243}
244
245
246void
247AtomicSimpleCPU::activateContext(int thread_num, int delay)
248{
249 DPRINTF(SimpleCPU, "ActivateContext %d (%d cycles)\n", thread_num, delay);
250
251 assert(thread_num == 0);
252 assert(thread);
253
254 assert(_status == Idle);
255 assert(!tickEvent.scheduled());
256
257 notIdleFraction++;
258 numCycles += tickToCycles(thread->lastActivate - thread->lastSuspend);
259
260 //Make sure ticks are still on multiples of cycles
261 schedule(tickEvent, nextCycle(curTick + ticks(delay)));
262 _status = Running;
263}
264
265
266void
267AtomicSimpleCPU::suspendContext(int thread_num)
268{
269 DPRINTF(SimpleCPU, "SuspendContext %d\n", thread_num);
270
271 assert(thread_num == 0);
272 assert(thread);
273
274 assert(_status == Running);
275
276 // tick event may not be scheduled if this gets called from inside
277 // an instruction's execution, e.g. "quiesce"
278 if (tickEvent.scheduled())
279 deschedule(tickEvent);
280
281 notIdleFraction--;
282 _status = Idle;
283}
284
285
286template <class T>
287Fault
288AtomicSimpleCPU::read(Addr addr, T &data, unsigned flags)
289{
290 // use the CPU's statically allocated read request and packet objects
291 Request *req = &data_read_req;
292
293 if (traceData) {
294 traceData->setAddr(addr);
295 }
296
297 //The block size of our peer.
298 int blockSize = dcachePort.peerBlockSize();
299 //The size of the data we're trying to read.
300 int dataSize = sizeof(T);
301
302 uint8_t * dataPtr = (uint8_t *)&data;
303
304 //The address of the second part of this access if it needs to be split
305 //across a cache line boundary.
306 Addr secondAddr = roundDown(addr + dataSize - 1, blockSize);
307
308 if(secondAddr > addr)
309 dataSize = secondAddr - addr;
310
311 dcache_latency = 0;
312
313 while(1) {
314 req->setVirt(0, addr, dataSize, flags, thread->readPC());
315
316 // translate to physical address
317 Fault fault = thread->dtb->translateAtomic(req, tc, false);
318
319 // Now do the access.
320 if (fault == NoFault) {
321 Packet pkt = Packet(req,
322 req->isLocked() ? MemCmd::LoadLockedReq : MemCmd::ReadReq,
323 Packet::Broadcast);
324 pkt.dataStatic(dataPtr);
325
326 if (req->isMmapedIpr())
327 dcache_latency += TheISA::handleIprRead(thread->getTC(), &pkt);
328 else {
329 if (hasPhysMemPort && pkt.getAddr() == physMemAddr)
330 dcache_latency += physmemPort.sendAtomic(&pkt);
331 else
332 dcache_latency += dcachePort.sendAtomic(&pkt);
333 }
334 dcache_access = true;
335
336 assert(!pkt.isError());
337
338 if (req->isLocked()) {
339 TheISA::handleLockedRead(thread, req);
340 }
341 }
342
343 // This will need a new way to tell if it has a dcache attached.
344 if (req->isUncacheable())
345 recordEvent("Uncached Read");
346
347 //If there's a fault, return it
348 if (fault != NoFault)
349 return fault;
350 //If we don't need to access a second cache line, stop now.
351 if (secondAddr <= addr)
352 {
353 data = gtoh(data);
354 if (traceData) {
355 traceData->setData(data);
356 }
357 return fault;
358 }
359
360 /*
361 * Set up for accessing the second cache line.
362 */
363
364 //Move the pointer we're reading into to the correct location.
365 dataPtr += dataSize;
366 //Adjust the size to get the remaining bytes.
367 dataSize = addr + sizeof(T) - secondAddr;
368 //And access the right address.
369 addr = secondAddr;
370 }
371}
372
373#ifndef DOXYGEN_SHOULD_SKIP_THIS
374
375template
376Fault
377AtomicSimpleCPU::read(Addr addr, Twin32_t &data, unsigned flags);
378
379template
380Fault
381AtomicSimpleCPU::read(Addr addr, Twin64_t &data, unsigned flags);
382
383template
384Fault
385AtomicSimpleCPU::read(Addr addr, uint64_t &data, unsigned flags);
386
387template
388Fault
389AtomicSimpleCPU::read(Addr addr, uint32_t &data, unsigned flags);
390
391template
392Fault
393AtomicSimpleCPU::read(Addr addr, uint16_t &data, unsigned flags);
394
395template
396Fault
397AtomicSimpleCPU::read(Addr addr, uint8_t &data, unsigned flags);
398
399#endif //DOXYGEN_SHOULD_SKIP_THIS
400
401template<>
402Fault
403AtomicSimpleCPU::read(Addr addr, double &data, unsigned flags)
404{
405 return read(addr, *(uint64_t*)&data, flags);
406}
407
408template<>
409Fault
410AtomicSimpleCPU::read(Addr addr, float &data, unsigned flags)
411{
412 return read(addr, *(uint32_t*)&data, flags);
413}
414
415
416template<>
417Fault
418AtomicSimpleCPU::read(Addr addr, int32_t &data, unsigned flags)
419{
420 return read(addr, (uint32_t&)data, flags);
421}
422
423
424template <class T>
425Fault
426AtomicSimpleCPU::write(T data, Addr addr, unsigned flags, uint64_t *res)
427{
428 // use the CPU's statically allocated write request and packet objects
429 Request *req = &data_write_req;
430
431 if (traceData) {
432 traceData->setAddr(addr);
433 }
434
435 //The block size of our peer.
436 int blockSize = dcachePort.peerBlockSize();
437 //The size of the data we're trying to read.
438 int dataSize = sizeof(T);
439
440 uint8_t * dataPtr = (uint8_t *)&data;
441
442 //The address of the second part of this access if it needs to be split
443 //across a cache line boundary.
444 Addr secondAddr = roundDown(addr + dataSize - 1, blockSize);
445
446 if(secondAddr > addr)
447 dataSize = secondAddr - addr;
448
449 dcache_latency = 0;
450
451 while(1) {
452 req->setVirt(0, addr, dataSize, flags, thread->readPC());
453
454 // translate to physical address
455 Fault fault = thread->dtb->translateAtomic(req, tc, true);
456
457 // Now do the access.
458 if (fault == NoFault) {
459 MemCmd cmd = MemCmd::WriteReq; // default
460 bool do_access = true; // flag to suppress cache access
461
462 if (req->isLocked()) {
463 cmd = MemCmd::StoreCondReq;
464 do_access = TheISA::handleLockedWrite(thread, req);
465 } else if (req->isSwap()) {
466 cmd = MemCmd::SwapReq;
467 if (req->isCondSwap()) {
468 assert(res);
469 req->setExtraData(*res);
470 }
471 }
472
473 if (do_access) {
474 Packet pkt = Packet(req, cmd, Packet::Broadcast);
475 pkt.dataStatic(dataPtr);
476
477 if (req->isMmapedIpr()) {
478 dcache_latency +=
479 TheISA::handleIprWrite(thread->getTC(), &pkt);
480 } else {
481 //XXX This needs to be outside of the loop in order to
482 //work properly for cache line boundary crossing
483 //accesses in transendian simulations.
484 data = htog(data);
485 if (hasPhysMemPort && pkt.getAddr() == physMemAddr)
486 dcache_latency += physmemPort.sendAtomic(&pkt);
487 else
488 dcache_latency += dcachePort.sendAtomic(&pkt);
489 }
490 dcache_access = true;
491 assert(!pkt.isError());
492
493 if (req->isSwap()) {
494 assert(res);
495 *res = pkt.get<T>();
496 }
497 }
498
499 if (res && !req->isSwap()) {
500 *res = req->getExtraData();
501 }
502 }
503
504 // This will need a new way to tell if it's hooked up to a cache or not.
505 if (req->isUncacheable())
506 recordEvent("Uncached Write");
507
508 //If there's a fault or we don't need to access a second cache line,
509 //stop now.
510 if (fault != NoFault || secondAddr <= addr)
511 {
512 // If the write needs to have a fault on the access, consider
513 // calling changeStatus() and changing it to "bad addr write"
514 // or something.
515 if (traceData) {
516 traceData->setData(data);
517 }
518 return fault;
519 }
520
521 /*
522 * Set up for accessing the second cache line.
523 */
524
525 //Move the pointer we're reading into to the correct location.
526 dataPtr += dataSize;
527 //Adjust the size to get the remaining bytes.
528 dataSize = addr + sizeof(T) - secondAddr;
529 //And access the right address.
530 addr = secondAddr;
531 }
532}
533
534
535#ifndef DOXYGEN_SHOULD_SKIP_THIS
536
537template
538Fault
539AtomicSimpleCPU::write(Twin32_t data, Addr addr,
540 unsigned flags, uint64_t *res);
541
542template
543Fault
544AtomicSimpleCPU::write(Twin64_t data, Addr addr,
545 unsigned flags, uint64_t *res);
546
547template
548Fault
549AtomicSimpleCPU::write(uint64_t data, Addr addr,
550 unsigned flags, uint64_t *res);
551
552template
553Fault
554AtomicSimpleCPU::write(uint32_t data, Addr addr,
555 unsigned flags, uint64_t *res);
556
557template
558Fault
559AtomicSimpleCPU::write(uint16_t data, Addr addr,
560 unsigned flags, uint64_t *res);
561
562template
563Fault
564AtomicSimpleCPU::write(uint8_t data, Addr addr,
565 unsigned flags, uint64_t *res);
566
567#endif //DOXYGEN_SHOULD_SKIP_THIS
568
569template<>
570Fault
571AtomicSimpleCPU::write(double data, Addr addr, unsigned flags, uint64_t *res)
572{
573 return write(*(uint64_t*)&data, addr, flags, res);
574}
575
576template<>
577Fault
578AtomicSimpleCPU::write(float data, Addr addr, unsigned flags, uint64_t *res)
579{
580 return write(*(uint32_t*)&data, addr, flags, res);
581}
582
583
584template<>
585Fault
586AtomicSimpleCPU::write(int32_t data, Addr addr, unsigned flags, uint64_t *res)
587{
588 return write((uint32_t)data, addr, flags, res);
589}
590
591
592void
593AtomicSimpleCPU::tick()
594{
595 DPRINTF(SimpleCPU, "Tick\n");
596
597 Tick latency = 0;
598
599 for (int i = 0; i < width; ++i) {
600 numCycles++;
601
602 if (!curStaticInst || !curStaticInst->isDelayedCommit())
603 checkForInterrupts();
604
605 checkPcEventQueue();
606
607 Fault fault = NoFault;
608
609 bool fromRom = isRomMicroPC(thread->readMicroPC());
| 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, tc->contextId());
88 }
89#endif
90 if (hasPhysMemPort) {
91 bool snoop = false;
92 AddrRangeList pmAddrList;
93 physmemPort.getPeerAddressRanges(pmAddrList, snoop);
94 physMemAddr = *pmAddrList.begin();
95 }
96 // Atomic doesn't do MT right now, so contextId == threadId
97 ifetch_req.setThreadContext(_cpuId, 0); // Add thread ID if we add MT
98 data_read_req.setThreadContext(_cpuId, 0); // Add thread ID here too
99 data_write_req.setThreadContext(_cpuId, 0); // Add thread ID here too
100}
101
102bool
103AtomicSimpleCPU::CpuPort::recvTiming(PacketPtr pkt)
104{
105 panic("AtomicSimpleCPU doesn't expect recvTiming callback!");
106 return true;
107}
108
109Tick
110AtomicSimpleCPU::CpuPort::recvAtomic(PacketPtr pkt)
111{
112 //Snooping a coherence request, just return
113 return 0;
114}
115
116void
117AtomicSimpleCPU::CpuPort::recvFunctional(PacketPtr pkt)
118{
119 //No internal storage to update, just return
120 return;
121}
122
123void
124AtomicSimpleCPU::CpuPort::recvStatusChange(Status status)
125{
126 if (status == RangeChange) {
127 if (!snoopRangeSent) {
128 snoopRangeSent = true;
129 sendStatusChange(Port::RangeChange);
130 }
131 return;
132 }
133
134 panic("AtomicSimpleCPU doesn't expect recvStatusChange callback!");
135}
136
137void
138AtomicSimpleCPU::CpuPort::recvRetry()
139{
140 panic("AtomicSimpleCPU doesn't expect recvRetry callback!");
141}
142
143void
144AtomicSimpleCPU::DcachePort::setPeer(Port *port)
145{
146 Port::setPeer(port);
147
148#if FULL_SYSTEM
149 // Update the ThreadContext's memory ports (Functional/Virtual
150 // Ports)
151 cpu->tcBase()->connectMemPorts(cpu->tcBase());
152#endif
153}
154
155AtomicSimpleCPU::AtomicSimpleCPU(AtomicSimpleCPUParams *p)
156 : BaseSimpleCPU(p), tickEvent(this), width(p->width),
157 simulate_data_stalls(p->simulate_data_stalls),
158 simulate_inst_stalls(p->simulate_inst_stalls),
159 icachePort(name() + "-iport", this), dcachePort(name() + "-iport", this),
160 physmemPort(name() + "-iport", this), hasPhysMemPort(false)
161{
162 _status = Idle;
163
164 icachePort.snoopRangeSent = false;
165 dcachePort.snoopRangeSent = false;
166
167}
168
169
170AtomicSimpleCPU::~AtomicSimpleCPU()
171{
172}
173
174void
175AtomicSimpleCPU::serialize(ostream &os)
176{
177 SimObject::State so_state = SimObject::getState();
178 SERIALIZE_ENUM(so_state);
179 BaseSimpleCPU::serialize(os);
180 nameOut(os, csprintf("%s.tickEvent", name()));
181 tickEvent.serialize(os);
182}
183
184void
185AtomicSimpleCPU::unserialize(Checkpoint *cp, const string §ion)
186{
187 SimObject::State so_state;
188 UNSERIALIZE_ENUM(so_state);
189 BaseSimpleCPU::unserialize(cp, section);
190 tickEvent.unserialize(cp, csprintf("%s.tickEvent", section));
191}
192
193void
194AtomicSimpleCPU::resume()
195{
196 if (_status == Idle || _status == SwitchedOut)
197 return;
198
199 DPRINTF(SimpleCPU, "Resume\n");
200 assert(system->getMemoryMode() == Enums::atomic);
201
202 changeState(SimObject::Running);
203 if (thread->status() == ThreadContext::Active) {
204 if (!tickEvent.scheduled())
205 schedule(tickEvent, nextCycle());
206 }
207}
208
209void
210AtomicSimpleCPU::switchOut()
211{
212 assert(_status == Running || _status == Idle);
213 _status = SwitchedOut;
214
215 tickEvent.squash();
216}
217
218
219void
220AtomicSimpleCPU::takeOverFrom(BaseCPU *oldCPU)
221{
222 BaseCPU::takeOverFrom(oldCPU, &icachePort, &dcachePort);
223
224 assert(!tickEvent.scheduled());
225
226 // if any of this CPU's ThreadContexts are active, mark the CPU as
227 // running and schedule its tick event.
228 for (int i = 0; i < threadContexts.size(); ++i) {
229 ThreadContext *tc = threadContexts[i];
230 if (tc->status() == ThreadContext::Active && _status != Running) {
231 _status = Running;
232 schedule(tickEvent, nextCycle());
233 break;
234 }
235 }
236 if (_status != Running) {
237 _status = Idle;
238 }
239 assert(threadContexts.size() == 1);
240 ifetch_req.setThreadContext(_cpuId, 0); // Add thread ID if we add MT
241 data_read_req.setThreadContext(_cpuId, 0); // Add thread ID here too
242 data_write_req.setThreadContext(_cpuId, 0); // Add thread ID here too
243}
244
245
246void
247AtomicSimpleCPU::activateContext(int thread_num, int delay)
248{
249 DPRINTF(SimpleCPU, "ActivateContext %d (%d cycles)\n", thread_num, delay);
250
251 assert(thread_num == 0);
252 assert(thread);
253
254 assert(_status == Idle);
255 assert(!tickEvent.scheduled());
256
257 notIdleFraction++;
258 numCycles += tickToCycles(thread->lastActivate - thread->lastSuspend);
259
260 //Make sure ticks are still on multiples of cycles
261 schedule(tickEvent, nextCycle(curTick + ticks(delay)));
262 _status = Running;
263}
264
265
266void
267AtomicSimpleCPU::suspendContext(int thread_num)
268{
269 DPRINTF(SimpleCPU, "SuspendContext %d\n", thread_num);
270
271 assert(thread_num == 0);
272 assert(thread);
273
274 assert(_status == Running);
275
276 // tick event may not be scheduled if this gets called from inside
277 // an instruction's execution, e.g. "quiesce"
278 if (tickEvent.scheduled())
279 deschedule(tickEvent);
280
281 notIdleFraction--;
282 _status = Idle;
283}
284
285
286template <class T>
287Fault
288AtomicSimpleCPU::read(Addr addr, T &data, unsigned flags)
289{
290 // use the CPU's statically allocated read request and packet objects
291 Request *req = &data_read_req;
292
293 if (traceData) {
294 traceData->setAddr(addr);
295 }
296
297 //The block size of our peer.
298 int blockSize = dcachePort.peerBlockSize();
299 //The size of the data we're trying to read.
300 int dataSize = sizeof(T);
301
302 uint8_t * dataPtr = (uint8_t *)&data;
303
304 //The address of the second part of this access if it needs to be split
305 //across a cache line boundary.
306 Addr secondAddr = roundDown(addr + dataSize - 1, blockSize);
307
308 if(secondAddr > addr)
309 dataSize = secondAddr - addr;
310
311 dcache_latency = 0;
312
313 while(1) {
314 req->setVirt(0, addr, dataSize, flags, thread->readPC());
315
316 // translate to physical address
317 Fault fault = thread->dtb->translateAtomic(req, tc, false);
318
319 // Now do the access.
320 if (fault == NoFault) {
321 Packet pkt = Packet(req,
322 req->isLocked() ? MemCmd::LoadLockedReq : MemCmd::ReadReq,
323 Packet::Broadcast);
324 pkt.dataStatic(dataPtr);
325
326 if (req->isMmapedIpr())
327 dcache_latency += TheISA::handleIprRead(thread->getTC(), &pkt);
328 else {
329 if (hasPhysMemPort && pkt.getAddr() == physMemAddr)
330 dcache_latency += physmemPort.sendAtomic(&pkt);
331 else
332 dcache_latency += dcachePort.sendAtomic(&pkt);
333 }
334 dcache_access = true;
335
336 assert(!pkt.isError());
337
338 if (req->isLocked()) {
339 TheISA::handleLockedRead(thread, req);
340 }
341 }
342
343 // This will need a new way to tell if it has a dcache attached.
344 if (req->isUncacheable())
345 recordEvent("Uncached Read");
346
347 //If there's a fault, return it
348 if (fault != NoFault)
349 return fault;
350 //If we don't need to access a second cache line, stop now.
351 if (secondAddr <= addr)
352 {
353 data = gtoh(data);
354 if (traceData) {
355 traceData->setData(data);
356 }
357 return fault;
358 }
359
360 /*
361 * Set up for accessing the second cache line.
362 */
363
364 //Move the pointer we're reading into to the correct location.
365 dataPtr += dataSize;
366 //Adjust the size to get the remaining bytes.
367 dataSize = addr + sizeof(T) - secondAddr;
368 //And access the right address.
369 addr = secondAddr;
370 }
371}
372
373#ifndef DOXYGEN_SHOULD_SKIP_THIS
374
375template
376Fault
377AtomicSimpleCPU::read(Addr addr, Twin32_t &data, unsigned flags);
378
379template
380Fault
381AtomicSimpleCPU::read(Addr addr, Twin64_t &data, unsigned flags);
382
383template
384Fault
385AtomicSimpleCPU::read(Addr addr, uint64_t &data, unsigned flags);
386
387template
388Fault
389AtomicSimpleCPU::read(Addr addr, uint32_t &data, unsigned flags);
390
391template
392Fault
393AtomicSimpleCPU::read(Addr addr, uint16_t &data, unsigned flags);
394
395template
396Fault
397AtomicSimpleCPU::read(Addr addr, uint8_t &data, unsigned flags);
398
399#endif //DOXYGEN_SHOULD_SKIP_THIS
400
401template<>
402Fault
403AtomicSimpleCPU::read(Addr addr, double &data, unsigned flags)
404{
405 return read(addr, *(uint64_t*)&data, flags);
406}
407
408template<>
409Fault
410AtomicSimpleCPU::read(Addr addr, float &data, unsigned flags)
411{
412 return read(addr, *(uint32_t*)&data, flags);
413}
414
415
416template<>
417Fault
418AtomicSimpleCPU::read(Addr addr, int32_t &data, unsigned flags)
419{
420 return read(addr, (uint32_t&)data, flags);
421}
422
423
424template <class T>
425Fault
426AtomicSimpleCPU::write(T data, Addr addr, unsigned flags, uint64_t *res)
427{
428 // use the CPU's statically allocated write request and packet objects
429 Request *req = &data_write_req;
430
431 if (traceData) {
432 traceData->setAddr(addr);
433 }
434
435 //The block size of our peer.
436 int blockSize = dcachePort.peerBlockSize();
437 //The size of the data we're trying to read.
438 int dataSize = sizeof(T);
439
440 uint8_t * dataPtr = (uint8_t *)&data;
441
442 //The address of the second part of this access if it needs to be split
443 //across a cache line boundary.
444 Addr secondAddr = roundDown(addr + dataSize - 1, blockSize);
445
446 if(secondAddr > addr)
447 dataSize = secondAddr - addr;
448
449 dcache_latency = 0;
450
451 while(1) {
452 req->setVirt(0, addr, dataSize, flags, thread->readPC());
453
454 // translate to physical address
455 Fault fault = thread->dtb->translateAtomic(req, tc, true);
456
457 // Now do the access.
458 if (fault == NoFault) {
459 MemCmd cmd = MemCmd::WriteReq; // default
460 bool do_access = true; // flag to suppress cache access
461
462 if (req->isLocked()) {
463 cmd = MemCmd::StoreCondReq;
464 do_access = TheISA::handleLockedWrite(thread, req);
465 } else if (req->isSwap()) {
466 cmd = MemCmd::SwapReq;
467 if (req->isCondSwap()) {
468 assert(res);
469 req->setExtraData(*res);
470 }
471 }
472
473 if (do_access) {
474 Packet pkt = Packet(req, cmd, Packet::Broadcast);
475 pkt.dataStatic(dataPtr);
476
477 if (req->isMmapedIpr()) {
478 dcache_latency +=
479 TheISA::handleIprWrite(thread->getTC(), &pkt);
480 } else {
481 //XXX This needs to be outside of the loop in order to
482 //work properly for cache line boundary crossing
483 //accesses in transendian simulations.
484 data = htog(data);
485 if (hasPhysMemPort && pkt.getAddr() == physMemAddr)
486 dcache_latency += physmemPort.sendAtomic(&pkt);
487 else
488 dcache_latency += dcachePort.sendAtomic(&pkt);
489 }
490 dcache_access = true;
491 assert(!pkt.isError());
492
493 if (req->isSwap()) {
494 assert(res);
495 *res = pkt.get<T>();
496 }
497 }
498
499 if (res && !req->isSwap()) {
500 *res = req->getExtraData();
501 }
502 }
503
504 // This will need a new way to tell if it's hooked up to a cache or not.
505 if (req->isUncacheable())
506 recordEvent("Uncached Write");
507
508 //If there's a fault or we don't need to access a second cache line,
509 //stop now.
510 if (fault != NoFault || secondAddr <= addr)
511 {
512 // If the write needs to have a fault on the access, consider
513 // calling changeStatus() and changing it to "bad addr write"
514 // or something.
515 if (traceData) {
516 traceData->setData(data);
517 }
518 return fault;
519 }
520
521 /*
522 * Set up for accessing the second cache line.
523 */
524
525 //Move the pointer we're reading into to the correct location.
526 dataPtr += dataSize;
527 //Adjust the size to get the remaining bytes.
528 dataSize = addr + sizeof(T) - secondAddr;
529 //And access the right address.
530 addr = secondAddr;
531 }
532}
533
534
535#ifndef DOXYGEN_SHOULD_SKIP_THIS
536
537template
538Fault
539AtomicSimpleCPU::write(Twin32_t data, Addr addr,
540 unsigned flags, uint64_t *res);
541
542template
543Fault
544AtomicSimpleCPU::write(Twin64_t data, Addr addr,
545 unsigned flags, uint64_t *res);
546
547template
548Fault
549AtomicSimpleCPU::write(uint64_t data, Addr addr,
550 unsigned flags, uint64_t *res);
551
552template
553Fault
554AtomicSimpleCPU::write(uint32_t data, Addr addr,
555 unsigned flags, uint64_t *res);
556
557template
558Fault
559AtomicSimpleCPU::write(uint16_t data, Addr addr,
560 unsigned flags, uint64_t *res);
561
562template
563Fault
564AtomicSimpleCPU::write(uint8_t data, Addr addr,
565 unsigned flags, uint64_t *res);
566
567#endif //DOXYGEN_SHOULD_SKIP_THIS
568
569template<>
570Fault
571AtomicSimpleCPU::write(double data, Addr addr, unsigned flags, uint64_t *res)
572{
573 return write(*(uint64_t*)&data, addr, flags, res);
574}
575
576template<>
577Fault
578AtomicSimpleCPU::write(float data, Addr addr, unsigned flags, uint64_t *res)
579{
580 return write(*(uint32_t*)&data, addr, flags, res);
581}
582
583
584template<>
585Fault
586AtomicSimpleCPU::write(int32_t data, Addr addr, unsigned flags, uint64_t *res)
587{
588 return write((uint32_t)data, addr, flags, res);
589}
590
591
592void
593AtomicSimpleCPU::tick()
594{
595 DPRINTF(SimpleCPU, "Tick\n");
596
597 Tick latency = 0;
598
599 for (int i = 0; i < width; ++i) {
600 numCycles++;
601
602 if (!curStaticInst || !curStaticInst->isDelayedCommit())
603 checkForInterrupts();
604
605 checkPcEventQueue();
606
607 Fault fault = NoFault;
608
609 bool fromRom = isRomMicroPC(thread->readMicroPC());
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