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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: LoadStoreBuffer.cc | |
4 | // Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. | |
5 | // DO NOT ALTER OR REMOVE COPYRIGHT NOTICES. | |
6 | // | |
7 | // The above named program is free software; you can redistribute it and/or | |
8 | // modify it under the terms of the GNU General Public | |
9 | // License version 2 as published by the Free Software Foundation. | |
10 | // | |
11 | // The above named program is distributed in the hope that it will be | |
12 | // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | // General Public License for more details. | |
15 | // | |
16 | // You should have received a copy of the GNU General Public | |
17 | // License along with this work; if not, write to the Free Software | |
18 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. | |
19 | // | |
20 | // ========== Copyright Header End ============================================ | |
21 | /************************************************************************ | |
22 | ** | |
23 | ** Copyright (C) 2002, Sun Microsystems, Inc. | |
24 | ** | |
25 | ** Sun considers its source code as an unpublished, proprietary | |
26 | ** trade secret and it is available only under strict license provisions. | |
27 | ** This copyright notice is placed here only to protect Sun in the event | |
28 | ** the source is deemed a published work. Disassembly, decompilation, | |
29 | ** or other means of reducing the object code to human readable form | |
30 | ** is prohibited by the license agreement under which this code is | |
31 | ** provided to the user or company in possession of this copy." | |
32 | ** | |
33 | *************************************************************************/ | |
34 | #include "LoadStoreBuffer.h" | |
35 | #include <sstream> | |
36 | ||
37 | using namespace std; | |
38 | //////////////////////////////////////////////// | |
39 | ||
40 | LoadStoreBuffer::LoadStoreBuffer() | |
41 | { | |
42 | // cerr << "LoadStoreBuffer Created, size= " << buf_.size() << endl; | |
43 | } | |
44 | ||
45 | //////////////////////////////////////////////// | |
46 | ||
47 | LoadStoreBuffer::LoadStoreBuffer( const LoadStoreBuffer & orig ) | |
48 | { | |
49 | ||
50 | } | |
51 | ||
52 | //////////////////////////////////////////////// | |
53 | ||
54 | LoadStoreBuffer::~LoadStoreBuffer() | |
55 | { | |
56 | ||
57 | } | |
58 | ||
59 | //////////////////////////////////////////////// | |
60 | ||
61 | const LoadStoreBuffer & | |
62 | LoadStoreBuffer::operator=( const LoadStoreBuffer & rhs ) | |
63 | { | |
64 | return *this; | |
65 | } | |
66 | ||
67 | //////////////////////////////////////////////// | |
68 | ||
69 | bool | |
70 | LoadStoreBuffer::operator==( const LoadStoreBuffer & rhs ) const | |
71 | { | |
72 | return false; | |
73 | } | |
74 | ||
75 | //////////////////////////////////////////////// | |
76 | ||
77 | string | |
78 | LoadStoreBuffer::toString() const | |
79 | { | |
80 | ostringstream os; | |
81 | list<LoadStoreEntry>::const_iterator ii; | |
82 | ||
83 | os << bufName_ << " (size=" << buf_.size() << ")" << endl; | |
84 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
85 | os << ii->toString(); | |
86 | } | |
87 | os << endl; | |
88 | return os.str(); | |
89 | } | |
90 | ||
91 | list<LoadStoreEntry>::iterator | |
92 | LoadStoreBuffer::pushBack(LoadStoreEntry& entry) | |
93 | { | |
94 | // cerr << "In LoadStoreBuffer::pushBack" << endl; | |
95 | ||
96 | list<LoadStoreEntry>::iterator it; | |
97 | ||
98 | buf_.push_back(entry); | |
99 | ||
100 | #ifdef MMDEBUG | |
101 | //MSYNC_DEBUG(1, "%s", toString().c_str()); | |
102 | MSYNC_DEBUG(1, "%s Pushback\n%s", bufName_, entry.toString().c_str()); | |
103 | MSYNC_DEBUG(1, "%s", toString().c_str()); | |
104 | #endif | |
105 | ||
106 | it = buf_.end(); | |
107 | return (--it); | |
108 | } | |
109 | ||
110 | void | |
111 | LoadStoreBuffer::erase(list<LoadStoreEntry>::iterator ii) | |
112 | { | |
113 | //assert(buf_.size() > 0); | |
114 | if (buf_.size() == 0) return; | |
115 | ||
116 | #ifdef MMDEBUG | |
117 | MSYNC_DEBUG(1, "%s Erase\n%s", bufName_, ii->toString().c_str()); | |
118 | #endif | |
119 | buf_.erase(ii); | |
120 | ||
121 | #ifdef MMDEBUG | |
122 | MSYNC_DEBUG(1, "%s", toString().c_str()); | |
123 | #endif | |
124 | } | |
125 | ||
126 | void | |
127 | LoadStoreBuffer::popFront() | |
128 | { | |
129 | list<LoadStoreEntry>::iterator ii; | |
130 | ||
131 | //assert(buf_.size() > 0); | |
132 | if (buf_.size() == 0) return; | |
133 | ||
134 | ii = buf_.begin(); | |
135 | ||
136 | #ifdef MMDEBUG | |
137 | MSYNC_DEBUG(1, "%s Remove (front)\n%s", bufName_, ii->toString().c_str()); | |
138 | #endif | |
139 | ||
140 | buf_.pop_front(); | |
141 | ||
142 | #ifdef MMDEBUG | |
143 | MSYNC_DEBUG(1, "%s", toString().c_str()); | |
144 | #endif | |
145 | } | |
146 | ||
147 | void | |
148 | LoadStoreBuffer::popBack(int count) | |
149 | { | |
150 | list<LoadStoreEntry>::iterator ii; | |
151 | ||
152 | //assert (buf_.size() >= count); | |
153 | if (buf_.size() < count) return; | |
154 | ||
155 | for (int i = 0; i < count; i++) { | |
156 | ii = --(buf_.end()); | |
157 | #ifdef MMDEBUG | |
158 | MSYNC_DEBUG(1, "%s Remove (back)\n%s", bufName_, ii->toString().c_str()); | |
159 | #endif | |
160 | buf_.pop_back(); | |
161 | } | |
162 | ||
163 | #ifdef MMDEBUG | |
164 | MSYNC_DEBUG(1, "%s", toString().c_str()); | |
165 | #endif | |
166 | } | |
167 | ||
168 | list<LoadStoreEntry>::iterator | |
169 | LoadStoreBuffer::findMatchY2O(uint64_t addr, uint8_t size_vector) | |
170 | { | |
171 | list<LoadStoreEntry>::iterator ii; | |
172 | ||
173 | if (buf_.size() == 0) { | |
174 | return buf_.end(); | |
175 | } | |
176 | ||
177 | ii = buf_.end(); | |
178 | do { | |
179 | ii--; | |
180 | assert(ii->isValid()); | |
181 | if ((addr & ADDR_MASK) == (ii->getAddr() & ADDR_MASK) && | |
182 | (size_vector == (size_vector & ii->getSizeV()))) { | |
183 | return (ii); | |
184 | } | |
185 | } while (ii != buf_.begin()); | |
186 | ||
187 | return (buf_.end()); // use buf_.end() to indicate not found | |
188 | } | |
189 | ||
190 | list<LoadStoreEntry>::iterator | |
191 | LoadStoreBuffer::findMatchY2O(uint64_t id, uint64_t addr, uint8_t size_vector) | |
192 | { | |
193 | list<LoadStoreEntry>::iterator ii; | |
194 | ||
195 | if (buf_.size() == 0) { | |
196 | return buf_.end(); | |
197 | } | |
198 | ||
199 | ii = buf_.end(); | |
200 | do { | |
201 | ii--; | |
202 | assert(ii->isValid()); | |
203 | if (id == ii->getId() && | |
204 | (addr & ADDR_MASK) == (ii->getAddr() & ADDR_MASK) && | |
205 | size_vector == (size_vector & ii->getSizeV())) { | |
206 | // assert(ii->isLinkValid() == false); | |
207 | return (ii); | |
208 | } | |
209 | } while (ii != buf_.begin()); | |
210 | ||
211 | return (buf_.end()); // use buf_.end() to indicate not found | |
212 | } | |
213 | ||
214 | list<LoadStoreEntry>::iterator | |
215 | LoadStoreBuffer::findMatchO2Y(uint64_t addr, uint8_t size_vector) | |
216 | { | |
217 | list<LoadStoreEntry>::iterator ii; | |
218 | ||
219 | if (buf_.size() == 0) { | |
220 | return buf_.end(); | |
221 | } | |
222 | ||
223 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
224 | assert(ii->isValid());; | |
225 | if (ii->isLinkValid() == false && | |
226 | (addr & ADDR_MASK) == (ii->getAddr() & ADDR_MASK) && | |
227 | size_vector == (size_vector & ii->getSizeV())) { | |
228 | return (ii); | |
229 | } | |
230 | } | |
231 | return (buf_.end()); // use buf_.end() to indicate not found | |
232 | } | |
233 | ||
234 | list<LoadStoreEntry>::iterator | |
235 | LoadStoreBuffer::findMatchO2Y(uint64_t id, uint64_t addr, uint8_t size_vector) | |
236 | { | |
237 | list<LoadStoreEntry>::iterator ii; | |
238 | ||
239 | if (buf_.size() == 0) { | |
240 | return buf_.end(); | |
241 | } | |
242 | ||
243 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
244 | assert(ii->isValid());; | |
245 | if (id == ii->getId() && | |
246 | (addr & ADDR_MASK) == (ii->getAddr() & ADDR_MASK) && | |
247 | size_vector == ii->getSizeV()) { | |
248 | // assert(ii->isLinkValid() == false); | |
249 | return (ii); | |
250 | } | |
251 | } | |
252 | return (buf_.end()); // use buf_.end() to indicate not found | |
253 | } | |
254 | ||
255 | list<LoadStoreEntry>::iterator | |
256 | LoadStoreBuffer::findMatchO2Y(uint64_t addr, enum LS_ENTRY_STATE state, uint64_t addrMask) | |
257 | { | |
258 | list<LoadStoreEntry>::iterator ii; | |
259 | ||
260 | if (buf_.size() == 0) { | |
261 | return buf_.end(); | |
262 | } | |
263 | ||
264 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
265 | assert(ii->isValid());; | |
266 | if ((addr & addrMask) == (ii->getAddr() & addrMask) && | |
267 | state == ii->getState()) { | |
268 | // assert(ii->isLinkValid() == false); | |
269 | return (ii); | |
270 | } | |
271 | } | |
272 | return (buf_.end()); // use buf_.end() to indicate not found | |
273 | } | |
274 | ||
275 | list<LoadStoreEntry>::iterator | |
276 | LoadStoreBuffer::findMatchO2Y(uint64_t addr) | |
277 | { | |
278 | list<LoadStoreEntry>::iterator ii; | |
279 | ||
280 | if (buf_.size() == 0) { | |
281 | return buf_.end(); | |
282 | } | |
283 | ||
284 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
285 | assert(ii->isValid());; | |
286 | if (addr == ii->getAddr()) { | |
287 | // assert(ii->isLinkValid() == false); | |
288 | return (ii); | |
289 | } | |
290 | } | |
291 | return (buf_.end()); // use buf_.end() to indicate not found | |
292 | } | |
293 | ||
294 | list<LoadStoreEntry>::iterator | |
295 | LoadStoreBuffer::findMatchO2Y(uint64_t addr, bool rmo, uint64_t addrMask) | |
296 | { | |
297 | list<LoadStoreEntry>::iterator ii; | |
298 | ||
299 | if (buf_.size() == 0) { | |
300 | return buf_.end(); | |
301 | } | |
302 | ||
303 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
304 | assert(ii->isValid());; | |
305 | if (((addr & addrMask) == (ii->getAddr() & addrMask)) && | |
306 | ((rmo && ii->isRMOstore()) || (!rmo && !ii->isRMOstore()))) { | |
307 | return (ii); | |
308 | } | |
309 | } | |
310 | return (buf_.end()); // use buf_.end() to indicate not found | |
311 | } | |
312 | ||
313 | list<LoadStoreEntry>::iterator | |
314 | LoadStoreBuffer::findNotIssuedO2Y(uint64_t addr) | |
315 | { | |
316 | list<LoadStoreEntry>::iterator ii; | |
317 | ||
318 | if (buf_.size() == 0) { | |
319 | return buf_.end(); | |
320 | } | |
321 | ||
322 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
323 | assert(ii->isValid());; | |
324 | if (!ii->isIssued() && | |
325 | (addr == ii->getAddr())) { | |
326 | return (ii); | |
327 | } | |
328 | } | |
329 | return (buf_.end()); // use buf_.end() to indicate not found | |
330 | } | |
331 | ||
332 | list<LoadStoreEntry>::iterator | |
333 | LoadStoreBuffer::find1stNoLink(uint64_t id, uint64_t addr, uint64_t addrMask) | |
334 | { | |
335 | list<LoadStoreEntry>::iterator ii; | |
336 | ||
337 | if (buf_.size() == 0) { | |
338 | return buf_.end(); | |
339 | } | |
340 | ||
341 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
342 | assert(ii->isValid());; | |
343 | if (!ii->isLinkValid() && | |
344 | (ii->getId() == id) && | |
345 | (ii->getAddr() & addrMask) == (addr & addrMask)) { | |
346 | return (ii); | |
347 | } | |
348 | } | |
349 | return (buf_.end()); // use buf_.end() to indicate not found | |
350 | } | |
351 | ||
352 | /* Note that this function exclude prefetch instruction */ | |
353 | list<LoadStoreEntry>::iterator | |
354 | LoadStoreBuffer::find1stNonExe() | |
355 | { | |
356 | list<LoadStoreEntry>::iterator ii; | |
357 | ||
358 | if (buf_.size() == 0) { | |
359 | return buf_.end(); | |
360 | } | |
361 | ||
362 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
363 | assert(ii->isValid());; | |
364 | if (!(ii->isExecuted())) { | |
365 | /* Riesling does not access memory for prefetch instruction, and hence | |
366 | no STEP callback. To overcome this issue, the MemorySync model use | |
367 | the next non-prefetch instruction to remove the prefetch instructions | |
368 | in the LoadBuffer and MemoryAccessBuffer by setting its executed_. | |
369 | */ | |
370 | if (ii->getItype() != ITYPE_PREFETCH) { | |
371 | return (ii); | |
372 | } else { | |
373 | ii->setExecuted(true); | |
374 | if (!ii->isLinkValid()) | |
375 | { | |
376 | MS_ERROR("Found prio prefetch in LoadBuffer does not have LoadData"); | |
377 | return buf_.end(); | |
378 | } | |
379 | ii->getLink()->setExecuted(true); | |
380 | } | |
381 | } | |
382 | } | |
383 | return (buf_.end()); // use buf_.end() to indicate not found | |
384 | } | |
385 | ||
386 | list<LoadStoreEntry>::iterator | |
387 | LoadStoreBuffer::find1stNonExeMatchedAddr(uint64_t addr) | |
388 | { | |
389 | list<LoadStoreEntry>::iterator ii; | |
390 | ||
391 | if (buf_.size() == 0) { | |
392 | return buf_.end(); | |
393 | } | |
394 | ||
395 | #ifdef MMDEBUG | |
396 | MSYNC_DEBUG(1, "Find addr=%#llx \n%s", addr, toString().c_str()); | |
397 | // cerr << "FIND addr=0x" << hex << addr << endl; | |
398 | // cerr << toString(); | |
399 | #endif | |
400 | ||
401 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
402 | assert(ii->isValid());; | |
403 | if (!(ii->isExecuted()) && addr == ii->getAddr()) { | |
404 | return (ii); | |
405 | } | |
406 | } | |
407 | return (buf_.end()); // use buf_.end() to indicate not found | |
408 | } | |
409 | ||
410 | list<LoadStoreEntry>::iterator | |
411 | LoadStoreBuffer::find1stNonExeFetch(uint64_t addr) | |
412 | { | |
413 | list<LoadStoreEntry>::iterator ii; | |
414 | ||
415 | if (buf_.size() == 0) { | |
416 | return buf_.end(); | |
417 | } | |
418 | ||
419 | #ifdef MMDEBUG | |
420 | MSYNC_DEBUG(1, "Find addr=%#llx \n%s", addr, toString().c_str()); | |
421 | // cerr << "FIND addr=0x" << hex << addr << endl; | |
422 | // cerr << toString(); | |
423 | #endif | |
424 | ||
425 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
426 | assert(ii->isValid());; | |
427 | if (!(ii->isExecuted()) && | |
428 | // (ii->getState() == LS_ACK) && | |
429 | addr == ii->getAddr()) { | |
430 | return (ii); | |
431 | } | |
432 | } | |
433 | return (buf_.end()); // use buf_.end() to indicate not found | |
434 | } | |
435 | ||
436 | list<LoadStoreEntry>::iterator | |
437 | LoadStoreBuffer::find1stNonExeOrMatchedAddrAtomic(uint64_t addr) | |
438 | { | |
439 | list<LoadStoreEntry>::iterator ii; | |
440 | ||
441 | if (buf_.size() == 0) { | |
442 | return buf_.end(); | |
443 | } | |
444 | ||
445 | #ifdef MMDEBUG | |
446 | MSYNC_DEBUG(1, "Find addr=%#llx \n%s", addr, toString().c_str()); | |
447 | // cerr << "FIND addr=0x" << hex << addr << endl; | |
448 | // cerr << toString(); | |
449 | #endif | |
450 | ||
451 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
452 | assert(ii->isValid());; | |
453 | if (!(ii->isExecuted())) { | |
454 | if (ii->getItype() != ITYPE_ATOMIC) { | |
455 | return (ii); | |
456 | } else { // atomic | |
457 | if (addr == ii->getAddr()) { | |
458 | return (ii); | |
459 | } else { | |
460 | ii->setExecuted(true); | |
461 | if (ii->isLinkValid()) { | |
462 | ii->getLink()->setExecuted(true); | |
463 | } | |
464 | } | |
465 | } | |
466 | } | |
467 | } | |
468 | return (buf_.end()); // use buf_.end() to indicate not found | |
469 | } | |
470 | ||
471 | list<LoadStoreEntry>::iterator | |
472 | LoadStoreBuffer::findNeedTDataO2Y(uint64_t addr) | |
473 | { | |
474 | list<LoadStoreEntry>::iterator ii; | |
475 | ||
476 | if (buf_.size() == 0) { | |
477 | return buf_.end(); | |
478 | } | |
479 | ||
480 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
481 | assert(ii->isValid()); | |
482 | if (!ii->isIssued() && ii->getState() != LS_TDATA && // only possible states are NEW & RDATA | |
483 | (addr) == (ii->getAddr())) { | |
484 | // assert(ii->isLinkValid() == false); | |
485 | return (ii); | |
486 | } | |
487 | } | |
488 | return (buf_.end()); // use buf_.end() to indicate not found | |
489 | } | |
490 | ||
491 | list<LoadStoreEntry>::iterator | |
492 | LoadStoreBuffer::findDataBypassing (uint64_t addr, uint8_t size_vector) | |
493 | { | |
494 | list<LoadStoreEntry>::iterator ii; | |
495 | uint8_t overlap; | |
496 | ||
497 | if (buf_.size() == 0) { | |
498 | return buf_.end(); | |
499 | } | |
500 | ||
501 | ii = buf_.end(); | |
502 | do { | |
503 | ii--; | |
504 | assert(ii->isValid()); | |
505 | if ((addr & ADDR_MASK) == (ii->getAddr() & ADDR_MASK)) { | |
506 | overlap = size_vector & ii->getSizeV(); | |
507 | if (overlap == size_vector) { // entry's data is a superset => bypassing | |
508 | return (ii); | |
509 | } else if (overlap == 0) { // no overlap, search for next | |
510 | continue; | |
511 | } else { // partially overlap => access from L2 | |
512 | return (buf_.end()); | |
513 | } | |
514 | } | |
515 | } while (ii != buf_.begin()); | |
516 | ||
517 | return (buf_.end()); // use buf_.end() to indicate not found | |
518 | } | |
519 | ||
520 | /****************************************************************************** | |
521 | * The store buffer bypassing check criteria is changed on 5/17/04 that treats | |
522 | * multiple hits as partial hit. In other words, no bypassing. To know this, | |
523 | * the algorithm has to check the whole store buffer. | |
524 | ******************************************************************************/ | |
525 | list<LoadStoreEntry>::iterator | |
526 | LoadStoreBuffer::findN2DataBypassing (uint64_t addr, uint8_t size_vector) | |
527 | { | |
528 | list<LoadStoreEntry>::iterator ii; | |
529 | list<LoadStoreEntry>::iterator matched_ste; | |
530 | bool matched; | |
531 | uint8_t overlap; | |
532 | ||
533 | if (buf_.size() == 0) { | |
534 | return buf_.end(); | |
535 | } | |
536 | ||
537 | matched = false; | |
538 | for (ii = buf_.begin(); ii != buf_.end(); ii++) { | |
539 | assert(ii->isValid()); | |
540 | if ((addr & ADDR_MASK) == (ii->getAddr() & ADDR_MASK)) { | |
541 | overlap = size_vector & ii->getSizeV(); | |
542 | if (overlap == size_vector) { // entry's data is a superset => bypassing | |
543 | if (matched) { | |
544 | return (buf_.end()); // multiple hits | |
545 | } else { | |
546 | matched = true; | |
547 | matched_ste = ii; | |
548 | continue; | |
549 | } | |
550 | } else if (overlap == 0) { // no overlap, search for next | |
551 | continue; | |
552 | } else { // partially overlap => access from L2 | |
553 | return (buf_.end()); | |
554 | } | |
555 | } | |
556 | } | |
557 | return (matched ? matched_ste : buf_.end()); // use buf_.end() to indicate not found | |
558 | } | |
559 | ||
560 | //============================================================================= | |
561 | //============================================================================= | |
562 | void | |
563 | LoadStoreBuffer::empty() | |
564 | { | |
565 | //cerr << "DBX: LoadStoreBuffer::empty: " << bufName_ << " size=" << buf_.size() << endl;//DBX | |
566 | //TODO make sure we free the space properly | |
567 | buf_.clear(); | |
568 | // while (buf_.size() > 0) { | |
569 | // buf_.pop_front(); | |
570 | // } | |
571 | } | |
572 | ||
573 | //============================================================================= | |
574 | //============================================================================= | |
575 | list<LoadStoreEntry>::iterator | |
576 | LoadStoreBuffer::queryBack() | |
577 | { | |
578 | list<LoadStoreEntry>::iterator ii; | |
579 | ||
580 | if (buf_.size() == 0) { | |
581 | return buf_.end(); | |
582 | } | |
583 | else { | |
584 | ii = --(buf_.end()); | |
585 | return (ii); | |
586 | } | |
587 | } | |
588 | ||
589 | //============================================================================= | |
590 | //============================================================================= | |
591 | void | |
592 | LoadStoreBuffer::markPop() | |
593 | { | |
594 | list<LoadStoreEntry>::iterator ii = buf_.end(); | |
595 | int size = buf_.size(); | |
596 | while (size > 0) { | |
597 | ii--; | |
598 | size--; | |
599 | if (ii->isLinkValid() && ii->getLink()->isPopped()) { | |
600 | //ii->setExecuted(true); | |
601 | buf_.erase(ii); | |
602 | } | |
603 | } | |
604 | } |