1/*
2 * Copyright (c) 2001-2005 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;

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41#include "base/trace.hh"
42#include "config/alpha_tlaser.hh"
43#include "cpu/thread_context.hh"
44#include "sim/builder.hh"
45
46using namespace std;
47using namespace EV5;
48
49///////////////////////////////////////////////////////////////////////
50//
51// Alpha TLB
52//
53#ifdef DEBUG
54bool uncacheBit39 = false;
55bool uncacheBit40 = false;
56#endif
57
58#define MODE2MASK(X) (1 << (X))
59
60AlphaTLB::AlphaTLB(const string &name, int s)
61 : SimObject(name), size(s), nlu(0)
62{
63 table = new AlphaISA::PTE[size];
64 memset(table, 0, sizeof(AlphaISA::PTE[size]));
65}
66
67AlphaTLB::~AlphaTLB()
68{
69 if (table)
70 delete [] table;
71}
72
73// look up an entry in the TLB
74AlphaISA::PTE *
75AlphaTLB::lookup(Addr vpn, uint8_t asn) const
76{
77 // assume not found...
78 AlphaISA::PTE *retval = NULL;
79
80 PageTable::const_iterator i = lookupTable.find(vpn);
81 if (i != lookupTable.end()) {
82 while (i->first == vpn) {
83 int index = i->second;
84 AlphaISA::PTE *pte = &table[index];
85 assert(pte->valid);
86 if (vpn == pte->tag && (pte->asma || pte->asn == asn)) {
87 retval = pte;
88 break;
89 }
90
91 ++i;
92 }
93 }
94
95 DPRINTF(TLB, "lookup %#x, asn %#x -> %s ppn %#x\n", vpn, (int)asn,
96 retval ? "hit" : "miss", retval ? retval->ppn : 0);
97 return retval;
98}
99
100
101Fault
102AlphaTLB::checkCacheability(RequestPtr &req)
103{
104 // in Alpha, cacheability is controlled by upper-level bits of the
105 // physical address
106
107 /*
108 * We support having the uncacheable bit in either bit 39 or bit 40.
109 * The Turbolaser platform (and EV5) support having the bit in 39, but
110 * Tsunami (which Linux assumes uses an EV6) generates accesses with
111 * the bit in 40. So we must check for both, but we have debug flags
112 * to catch a weird case where both are used, which shouldn't happen.
113 */
114
115
116#if ALPHA_TLASER
117 if (req->getPaddr() & PAddrUncachedBit39) {
118#else
119 if (req->getPaddr() & PAddrUncachedBit43) {
120#endif
121 // IPR memory space not implemented
122 if (PAddrIprSpace(req->getPaddr())) {
123 return new UnimpFault("IPR memory space not implemented!");
124 } else {
125 // mark request as uncacheable
126 req->setFlags(req->getFlags() | UNCACHEABLE);
127
128#if !ALPHA_TLASER
129 // Clear bits 42:35 of the physical address (10-2 in Tsunami manual)
130 req->setPaddr(req->getPaddr() & PAddrUncachedMask);
131#endif
132 }
133 }
134 return NoFault;
135}
136
137
138// insert a new TLB entry
139void
140AlphaTLB::insert(Addr addr, AlphaISA::PTE &pte)
141{
142 AlphaISA::VAddr vaddr = addr;
143 if (table[nlu].valid) {
144 Addr oldvpn = table[nlu].tag;
145 PageTable::iterator i = lookupTable.find(oldvpn);
146
147 if (i == lookupTable.end())
148 panic("TLB entry not found in lookupTable");
149
150 int index;
151 while ((index = i->second) != nlu) {
152 if (table[index].tag != oldvpn)
153 panic("TLB entry not found in lookupTable");
154
155 ++i;
156 }
157
158 DPRINTF(TLB, "remove @%d: %#x -> %#x\n", nlu, oldvpn, table[nlu].ppn);
159
160 lookupTable.erase(i);
161 }
162
163 DPRINTF(TLB, "insert @%d: %#x -> %#x\n", nlu, vaddr.vpn(), pte.ppn);
164
165 table[nlu] = pte;
166 table[nlu].tag = vaddr.vpn();
167 table[nlu].valid = true;
168
169 lookupTable.insert(make_pair(vaddr.vpn(), nlu));
170 nextnlu();
171}
172
173void
174AlphaTLB::flushAll()
175{
176 DPRINTF(TLB, "flushAll\n");
177 memset(table, 0, sizeof(AlphaISA::PTE[size]));
178 lookupTable.clear();
179 nlu = 0;
180}
181
182void
183AlphaTLB::flushProcesses()
184{
185 PageTable::iterator i = lookupTable.begin();
186 PageTable::iterator end = lookupTable.end();
187 while (i != end) {
188 int index = i->second;
189 AlphaISA::PTE *pte = &table[index];
190 assert(pte->valid);
191
192 // we can't increment i after we erase it, so save a copy and
193 // increment it to get the next entry now
194 PageTable::iterator cur = i;
195 ++i;
196
197 if (!pte->asma) {
198 DPRINTF(TLB, "flush @%d: %#x -> %#x\n", index, pte->tag, pte->ppn);
199 pte->valid = false;
200 lookupTable.erase(cur);
201 }
202 }
203}
204
205void
206AlphaTLB::flushAddr(Addr addr, uint8_t asn)
207{
208 AlphaISA::VAddr vaddr = addr;
209
210 PageTable::iterator i = lookupTable.find(vaddr.vpn());
211 if (i == lookupTable.end())
212 return;
213
214 while (i->first == vaddr.vpn()) {
215 int index = i->second;
216 AlphaISA::PTE *pte = &table[index];
217 assert(pte->valid);
218
219 if (vaddr.vpn() == pte->tag && (pte->asma || pte->asn == asn)) {
220 DPRINTF(TLB, "flushaddr @%d: %#x -> %#x\n", index, vaddr.vpn(),
221 pte->ppn);
222
223 // invalidate this entry
224 pte->valid = false;
225
226 lookupTable.erase(i);
227 }
228
229 ++i;
230 }
231}
232
233
234void
235AlphaTLB::serialize(ostream &os)
236{
237 SERIALIZE_SCALAR(size);
238 SERIALIZE_SCALAR(nlu);
239
240 for (int i = 0; i < size; i++) {
241 nameOut(os, csprintf("%s.PTE%d", name(), i));
242 table[i].serialize(os);
243 }
244}
245
246void
247AlphaTLB::unserialize(Checkpoint *cp, const string &section)
248{
249 UNSERIALIZE_SCALAR(size);
250 UNSERIALIZE_SCALAR(nlu);
251
252 for (int i = 0; i < size; i++) {
253 table[i].unserialize(cp, csprintf("%s.PTE%d", section, i));
254 if (table[i].valid) {
255 lookupTable.insert(make_pair(table[i].tag, i));
256 }
257 }
258}
259
260
261///////////////////////////////////////////////////////////////////////
262//
263// Alpha ITB
264//
265AlphaITB::AlphaITB(const std::string &name, int size)
266 : AlphaTLB(name, size)
267{}
268
269
270void
271AlphaITB::regStats()
272{
273 hits
274 .name(name() + ".hits")
275 .desc("ITB hits");
276 misses
277 .name(name() + ".misses")
278 .desc("ITB misses");
279 acv
280 .name(name() + ".acv")
281 .desc("ITB acv");
282 accesses
283 .name(name() + ".accesses")
284 .desc("ITB accesses");
285
286 accesses = hits + misses;
287}
288
289
290Fault
291AlphaITB::translate(RequestPtr &req, ThreadContext *tc) const
292{
293 if (AlphaISA::PcPAL(req->getVaddr())) {
294 // strip off PAL PC marker (lsb is 1)
295 req->setPaddr((req->getVaddr() & ~3) & PAddrImplMask);
296 hits++;
297 return NoFault;
298 }
299
300 if (req->getFlags() & PHYSICAL) {
301 req->setPaddr(req->getVaddr());
302 } else {
303 // verify that this is a good virtual address
304 if (!validVirtualAddress(req->getVaddr())) {
305 acv++;
306 return new ItbAcvFault(req->getVaddr());
307 }
308
309
310 // VA<42:41> == 2, VA<39:13> maps directly to PA<39:13> for EV5
311 // VA<47:41> == 0x7e, VA<40:13> maps directly to PA<40:13> for EV6
312#if ALPHA_TLASER
313 if ((MCSR_SP(tc->readMiscReg(AlphaISA::IPR_MCSR)) & 2) &&
314 VAddrSpaceEV5(req->getVaddr()) == 2) {
315#else
316 if (VAddrSpaceEV6(req->getVaddr()) == 0x7e) {
317#endif
318 // only valid in kernel mode
319 if (ICM_CM(tc->readMiscReg(AlphaISA::IPR_ICM)) !=
320 AlphaISA::mode_kernel) {
321 acv++;
322 return new ItbAcvFault(req->getVaddr());
323 }
324
325 req->setPaddr(req->getVaddr() & PAddrImplMask);
326
327#if !ALPHA_TLASER
328 // sign extend the physical address properly
329 if (req->getPaddr() & PAddrUncachedBit40)
330 req->setPaddr(req->getPaddr() | ULL(0xf0000000000));
331 else
332 req->setPaddr(req->getPaddr() & ULL(0xffffffffff));
333#endif
334
335 } else {
336 // not a physical address: need to look up pte
337 int asn = DTB_ASN_ASN(tc->readMiscReg(AlphaISA::IPR_DTB_ASN));
338 AlphaISA::PTE *pte = lookup(AlphaISA::VAddr(req->getVaddr()).vpn(),
339 asn);
340
341 if (!pte) {
342 misses++;
343 return new ItbPageFault(req->getVaddr());
344 }
345
346 req->setPaddr((pte->ppn << AlphaISA::PageShift) +
347 (AlphaISA::VAddr(req->getVaddr()).offset()
348 & ~3));
349
350 // check permissions for this access
351 if (!(pte->xre &
352 (1 << ICM_CM(tc->readMiscReg(AlphaISA::IPR_ICM))))) {
353 // instruction access fault
354 acv++;
355 return new ItbAcvFault(req->getVaddr());
356 }
357
358 hits++;
359 }
360 }
361
362 // check that the physical address is ok (catch bad physical addresses)
363 if (req->getPaddr() & ~PAddrImplMask)
364 return genMachineCheckFault();
365
366 return checkCacheability(req);
367
368}
369
370///////////////////////////////////////////////////////////////////////
371//
372// Alpha DTB
373//
374AlphaDTB::AlphaDTB(const std::string &name, int size)
375 : AlphaTLB(name, size)
376{}
377
378void
379AlphaDTB::regStats()
380{
381 read_hits
382 .name(name() + ".read_hits")
383 .desc("DTB read hits")
384 ;
385
386 read_misses
387 .name(name() + ".read_misses")
388 .desc("DTB read misses")
389 ;
390
391 read_acv
392 .name(name() + ".read_acv")
393 .desc("DTB read access violations")
394 ;
395
396 read_accesses
397 .name(name() + ".read_accesses")
398 .desc("DTB read accesses")
399 ;
400
401 write_hits
402 .name(name() + ".write_hits")
403 .desc("DTB write hits")
404 ;
405
406 write_misses
407 .name(name() + ".write_misses")
408 .desc("DTB write misses")
409 ;
410
411 write_acv
412 .name(name() + ".write_acv")
413 .desc("DTB write access violations")
414 ;
415
416 write_accesses
417 .name(name() + ".write_accesses")
418 .desc("DTB write accesses")
419 ;
420
421 hits
422 .name(name() + ".hits")
423 .desc("DTB hits")
424 ;
425
426 misses
427 .name(name() + ".misses")
428 .desc("DTB misses")
429 ;
430
431 acv
432 .name(name() + ".acv")
433 .desc("DTB access violations")
434 ;
435
436 accesses
437 .name(name() + ".accesses")
438 .desc("DTB accesses")
439 ;
440
441 hits = read_hits + write_hits;
442 misses = read_misses + write_misses;
443 acv = read_acv + write_acv;
444 accesses = read_accesses + write_accesses;
445}
446
447Fault
448AlphaDTB::translate(RequestPtr &req, ThreadContext *tc, bool write) const
449{
450 Addr pc = tc->readPC();
451
452 AlphaISA::mode_type mode =
453 (AlphaISA::mode_type)DTB_CM_CM(tc->readMiscReg(AlphaISA::IPR_DTB_CM));
454
455
456 /**
457 * Check for alignment faults
458 */
459 if (req->getVaddr() & (req->getSize() - 1)) {
460 DPRINTF(TLB, "Alignment Fault on %#x, size = %d", req->getVaddr(),
461 req->getSize());
462 uint64_t flags = write ? MM_STAT_WR_MASK : 0;
463 return new DtbAlignmentFault(req->getVaddr(), req->getFlags(), flags);
464 }
465
466 if (pc & 0x1) {
467 mode = (req->getFlags() & ALTMODE) ?
468 (AlphaISA::mode_type)ALT_MODE_AM(
469 tc->readMiscReg(AlphaISA::IPR_ALT_MODE))
470 : AlphaISA::mode_kernel;
471 }
472
473 if (req->getFlags() & PHYSICAL) {
474 req->setPaddr(req->getVaddr());
475 } else {
476 // verify that this is a good virtual address
477 if (!validVirtualAddress(req->getVaddr())) {
478 if (write) { write_acv++; } else { read_acv++; }
479 uint64_t flags = (write ? MM_STAT_WR_MASK : 0) |
480 MM_STAT_BAD_VA_MASK |
481 MM_STAT_ACV_MASK;
482 return new DtbPageFault(req->getVaddr(), req->getFlags(), flags);
483 }
484
485 // Check for "superpage" mapping
486#if ALPHA_TLASER
487 if ((MCSR_SP(tc->readMiscReg(AlphaISA::IPR_MCSR)) & 2) &&
488 VAddrSpaceEV5(req->getVaddr()) == 2) {
489#else
490 if (VAddrSpaceEV6(req->getVaddr()) == 0x7e) {
491#endif
492
493 // only valid in kernel mode
494 if (DTB_CM_CM(tc->readMiscReg(AlphaISA::IPR_DTB_CM)) !=
495 AlphaISA::mode_kernel) {
496 if (write) { write_acv++; } else { read_acv++; }
497 uint64_t flags = ((write ? MM_STAT_WR_MASK : 0) |
498 MM_STAT_ACV_MASK);
499 return new DtbAcvFault(req->getVaddr(), req->getFlags(), flags);
500 }
501
502 req->setPaddr(req->getVaddr() & PAddrImplMask);
503
504#if !ALPHA_TLASER
505 // sign extend the physical address properly
506 if (req->getPaddr() & PAddrUncachedBit40)
507 req->setPaddr(req->getPaddr() | ULL(0xf0000000000));
508 else
509 req->setPaddr(req->getPaddr() & ULL(0xffffffffff));
510#endif
511
512 } else {
513 if (write)
514 write_accesses++;
515 else
516 read_accesses++;
517
518 int asn = DTB_ASN_ASN(tc->readMiscReg(AlphaISA::IPR_DTB_ASN));
519
520 // not a physical address: need to look up pte
521 AlphaISA::PTE *pte = lookup(AlphaISA::VAddr(req->getVaddr()).vpn(),
522 asn);
523
524 if (!pte) {
525 // page fault
526 if (write) { write_misses++; } else { read_misses++; }
527 uint64_t flags = (write ? MM_STAT_WR_MASK : 0) |
528 MM_STAT_DTB_MISS_MASK;
529 return (req->getFlags() & VPTE) ?
530 (Fault)(new PDtbMissFault(req->getVaddr(), req->getFlags(),
531 flags)) :
532 (Fault)(new NDtbMissFault(req->getVaddr(), req->getFlags(),
533 flags));
534 }
535
536 req->setPaddr((pte->ppn << AlphaISA::PageShift) +
537 AlphaISA::VAddr(req->getVaddr()).offset());
538
539 if (write) {
540 if (!(pte->xwe & MODE2MASK(mode))) {
541 // declare the instruction access fault
542 write_acv++;
543 uint64_t flags = MM_STAT_WR_MASK |
544 MM_STAT_ACV_MASK |
545 (pte->fonw ? MM_STAT_FONW_MASK : 0);
546 return new DtbPageFault(req->getVaddr(), req->getFlags(), flags);
547 }
548 if (pte->fonw) {
549 write_acv++;
550 uint64_t flags = MM_STAT_WR_MASK |
551 MM_STAT_FONW_MASK;
552 return new DtbPageFault(req->getVaddr(), req->getFlags(), flags);
553 }
554 } else {
555 if (!(pte->xre & MODE2MASK(mode))) {
556 read_acv++;
557 uint64_t flags = MM_STAT_ACV_MASK |
558 (pte->fonr ? MM_STAT_FONR_MASK : 0);
559 return new DtbAcvFault(req->getVaddr(), req->getFlags(), flags);
560 }
561 if (pte->fonr) {
562 read_acv++;
563 uint64_t flags = MM_STAT_FONR_MASK;
564 return new DtbPageFault(req->getVaddr(), req->getFlags(), flags);
565 }
566 }
567 }
568
569 if (write)
570 write_hits++;
571 else
572 read_hits++;
573 }
574
575 // check that the physical address is ok (catch bad physical addresses)
576 if (req->getPaddr() & ~PAddrImplMask)
577 return genMachineCheckFault();
578
579 return checkCacheability(req);
580}
581
582AlphaISA::PTE &
583AlphaTLB::index(bool advance)
584{
585 AlphaISA::PTE *pte = &table[nlu];
586
587 if (advance)
588 nextnlu();
589
590 return *pte;
591}
592
593DEFINE_SIM_OBJECT_CLASS_NAME("AlphaTLB", AlphaTLB)
594
595BEGIN_DECLARE_SIM_OBJECT_PARAMS(AlphaITB)
596
597 Param<int> size;
598
599END_DECLARE_SIM_OBJECT_PARAMS(AlphaITB)
600
601BEGIN_INIT_SIM_OBJECT_PARAMS(AlphaITB)
602
603 INIT_PARAM_DFLT(size, "TLB size", 48)
604
605END_INIT_SIM_OBJECT_PARAMS(AlphaITB)
606
607
608CREATE_SIM_OBJECT(AlphaITB)
609{
610 return new AlphaITB(getInstanceName(), size);
611}
612
613REGISTER_SIM_OBJECT("AlphaITB", AlphaITB)
614
615BEGIN_DECLARE_SIM_OBJECT_PARAMS(AlphaDTB)
616
617 Param<int> size;
618
619END_DECLARE_SIM_OBJECT_PARAMS(AlphaDTB)
620
621BEGIN_INIT_SIM_OBJECT_PARAMS(AlphaDTB)
622
623 INIT_PARAM_DFLT(size, "TLB size", 64)
624
625END_INIT_SIM_OBJECT_PARAMS(AlphaDTB)
626
627
628CREATE_SIM_OBJECT(AlphaDTB)
629{
630 return new AlphaDTB(getInstanceName(), size);
631}
632
633REGISTER_SIM_OBJECT("AlphaDTB", AlphaDTB)
634