tlb.cc revision 5917:7d7df4ad7486 
1/*
2 * Copyright (c) 2007-2008 The Hewlett-Packard Development Company
3 * All rights reserved.
4 *
5 * Redistribution and use of this software in source and binary forms,
6 * with or without modification, are permitted provided that the
7 * following conditions are met:
8 *
9 * The software must be used only for Non-Commercial Use which means any
10 * use which is NOT directed to receiving any direct monetary
11 * compensation for, or commercial advantage from such use.  Illustrative
12 * examples of non-commercial use are academic research, personal study,
13 * teaching, education and corporate research & development.
14 * Illustrative examples of commercial use are distributing products for
15 * commercial advantage and providing services using the software for
16 * commercial advantage.
17 *
18 * If you wish to use this software or functionality therein that may be
19 * covered by patents for commercial use, please contact:
20 *     Director of Intellectual Property Licensing
21 *     Office of Strategy and Technology
22 *     Hewlett-Packard Company
23 *     1501 Page Mill Road
24 *     Palo Alto, California  94304
25 *
26 * Redistributions of source code must retain the above copyright notice,
27 * this list of conditions and the following disclaimer.  Redistributions
28 * in binary form must reproduce the above copyright notice, this list of
29 * conditions and the following disclaimer in the documentation and/or
30 * other materials provided with the distribution.  Neither the name of
31 * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
32 * contributors may be used to endorse or promote products derived from
33 * this software without specific prior written permission.  No right of
34 * sublicense is granted herewith.  Derivatives of the software and
35 * output created using the software may be prepared, but only for
36 * Non-Commercial Uses.  Derivatives of the software may be shared with
37 * others provided: (i) the others agree to abide by the list of
38 * conditions herein which includes the Non-Commercial Use restrictions;
39 * and (ii) such Derivatives of the software include the above copyright
40 * notice to acknowledge the contribution from this software where
41 * applicable, this list of conditions and the disclaimer below.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
44 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
45 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
46 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
47 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
49 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
50 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
51 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
52 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
53 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
54 *
55 * Authors: Gabe Black
56 */
57
58#include <cstring>
59
60#include "config/full_system.hh"
61
62#include "arch/x86/insts/microldstop.hh"
63#include "arch/x86/pagetable.hh"
64#include "arch/x86/tlb.hh"
65#include "arch/x86/x86_traits.hh"
66#include "base/bitfield.hh"
67#include "base/trace.hh"
68#include "config/full_system.hh"
69#include "cpu/thread_context.hh"
70#include "cpu/base.hh"
71#include "mem/packet_access.hh"
72#include "mem/request.hh"
73
74#if FULL_SYSTEM
75#include "arch/x86/pagetable_walker.hh"
76#else
77#include "mem/page_table.hh"
78#include "sim/process.hh"
79#endif
80
81namespace X86ISA {
82
83TLB::TLB(const Params *p) : BaseTLB(p), configAddress(0), size(p->size)
84{
85    tlb = new TlbEntry[size];
86    std::memset(tlb, 0, sizeof(TlbEntry) * size);
87
88    for (int x = 0; x < size; x++)
89        freeList.push_back(&tlb[x]);
90
91#if FULL_SYSTEM
92    walker = p->walker;
93    walker->setTLB(this);
94#endif
95}
96
97TlbEntry *
98TLB::insert(Addr vpn, TlbEntry &entry)
99{
100    //TODO Deal with conflicting entries
101
102    TlbEntry *newEntry = NULL;
103    if (!freeList.empty()) {
104        newEntry = freeList.front();
105        freeList.pop_front();
106    } else {
107        newEntry = entryList.back();
108        entryList.pop_back();
109    }
110    *newEntry = entry;
111    newEntry->vaddr = vpn;
112    entryList.push_front(newEntry);
113    return newEntry;
114}
115
116TLB::EntryList::iterator
117TLB::lookupIt(Addr va, bool update_lru)
118{
119    //TODO make this smarter at some point
120    EntryList::iterator entry;
121    for (entry = entryList.begin(); entry != entryList.end(); entry++) {
122        if ((*entry)->vaddr <= va && (*entry)->vaddr + (*entry)->size > va) {
123            DPRINTF(TLB, "Matched vaddr %#x to entry starting at %#x "
124                    "with size %#x.\n", va, (*entry)->vaddr, (*entry)->size);
125            if (update_lru) {
126                entryList.push_front(*entry);
127                entryList.erase(entry);
128                entry = entryList.begin();
129            }
130            break;
131        }
132    }
133    return entry;
134}
135
136TlbEntry *
137TLB::lookup(Addr va, bool update_lru)
138{
139    EntryList::iterator entry = lookupIt(va, update_lru);
140    if (entry == entryList.end())
141        return NULL;
142    else
143        return *entry;
144}
145
146void
147TLB::invalidateAll()
148{
149    DPRINTF(TLB, "Invalidating all entries.\n");
150    while (!entryList.empty()) {
151        TlbEntry *entry = entryList.front();
152        entryList.pop_front();
153        freeList.push_back(entry);
154    }
155}
156
157void
158TLB::setConfigAddress(uint32_t addr)
159{
160    configAddress = addr;
161}
162
163void
164TLB::invalidateNonGlobal()
165{
166    DPRINTF(TLB, "Invalidating all non global entries.\n");
167    EntryList::iterator entryIt;
168    for (entryIt = entryList.begin(); entryIt != entryList.end();) {
169        if (!(*entryIt)->global) {
170            freeList.push_back(*entryIt);
171            entryList.erase(entryIt++);
172        } else {
173            entryIt++;
174        }
175    }
176}
177
178void
179TLB::demapPage(Addr va, uint64_t asn)
180{
181    EntryList::iterator entry = lookupIt(va, false);
182    if (entry != entryList.end()) {
183        freeList.push_back(*entry);
184        entryList.erase(entry);
185    }
186}
187
188Fault
189TLB::translate(RequestPtr req, ThreadContext *tc,
190        Translation *translation, bool write, bool execute,
191        bool &delayedResponse, bool timing)
192{
193    delayedResponse = false;
194    Addr vaddr = req->getVaddr();
195    DPRINTF(TLB, "Translating vaddr %#x.\n", vaddr);
196    uint32_t flags = req->getFlags();
197    bool storeCheck = flags & StoreCheck;
198
199    int seg = flags & SegmentFlagMask;
200
201    //XXX Junk code to surpress the warning
202    if (storeCheck);
203
204    // If this is true, we're dealing with a request to read an internal
205    // value.
206    if (seg == SEGMENT_REG_MS) {
207        DPRINTF(TLB, "Addresses references internal memory.\n");
208        Addr prefix = (vaddr >> 3) & IntAddrPrefixMask;
209        if (prefix == IntAddrPrefixCPUID) {
210            panic("CPUID memory space not yet implemented!\n");
211        } else if (prefix == IntAddrPrefixMSR) {
212            vaddr = vaddr >> 3;
213            req->setMmapedIpr(true);
214            Addr regNum = 0;
215            switch (vaddr & ~IntAddrPrefixMask) {
216              case 0x10:
217                regNum = MISCREG_TSC;
218                break;
219              case 0x1B:
220                regNum = MISCREG_APIC_BASE;
221                break;
222              case 0xFE:
223                regNum = MISCREG_MTRRCAP;
224                break;
225              case 0x174:
226                regNum = MISCREG_SYSENTER_CS;
227                break;
228              case 0x175:
229                regNum = MISCREG_SYSENTER_ESP;
230                break;
231              case 0x176:
232                regNum = MISCREG_SYSENTER_EIP;
233                break;
234              case 0x179:
235                regNum = MISCREG_MCG_CAP;
236                break;
237              case 0x17A:
238                regNum = MISCREG_MCG_STATUS;
239                break;
240              case 0x17B:
241                regNum = MISCREG_MCG_CTL;
242                break;
243              case 0x1D9:
244                regNum = MISCREG_DEBUG_CTL_MSR;
245                break;
246              case 0x1DB:
247                regNum = MISCREG_LAST_BRANCH_FROM_IP;
248                break;
249              case 0x1DC:
250                regNum = MISCREG_LAST_BRANCH_TO_IP;
251                break;
252              case 0x1DD:
253                regNum = MISCREG_LAST_EXCEPTION_FROM_IP;
254                break;
255              case 0x1DE:
256                regNum = MISCREG_LAST_EXCEPTION_TO_IP;
257                break;
258              case 0x200:
259                regNum = MISCREG_MTRR_PHYS_BASE_0;
260                break;
261              case 0x201:
262                regNum = MISCREG_MTRR_PHYS_MASK_0;
263                break;
264              case 0x202:
265                regNum = MISCREG_MTRR_PHYS_BASE_1;
266                break;
267              case 0x203:
268                regNum = MISCREG_MTRR_PHYS_MASK_1;
269                break;
270              case 0x204:
271                regNum = MISCREG_MTRR_PHYS_BASE_2;
272                break;
273              case 0x205:
274                regNum = MISCREG_MTRR_PHYS_MASK_2;
275                break;
276              case 0x206:
277                regNum = MISCREG_MTRR_PHYS_BASE_3;
278                break;
279              case 0x207:
280                regNum = MISCREG_MTRR_PHYS_MASK_3;
281                break;
282              case 0x208:
283                regNum = MISCREG_MTRR_PHYS_BASE_4;
284                break;
285              case 0x209:
286                regNum = MISCREG_MTRR_PHYS_MASK_4;
287                break;
288              case 0x20A:
289                regNum = MISCREG_MTRR_PHYS_BASE_5;
290                break;
291              case 0x20B:
292                regNum = MISCREG_MTRR_PHYS_MASK_5;
293                break;
294              case 0x20C:
295                regNum = MISCREG_MTRR_PHYS_BASE_6;
296                break;
297              case 0x20D:
298                regNum = MISCREG_MTRR_PHYS_MASK_6;
299                break;
300              case 0x20E:
301                regNum = MISCREG_MTRR_PHYS_BASE_7;
302                break;
303              case 0x20F:
304                regNum = MISCREG_MTRR_PHYS_MASK_7;
305                break;
306              case 0x250:
307                regNum = MISCREG_MTRR_FIX_64K_00000;
308                break;
309              case 0x258:
310                regNum = MISCREG_MTRR_FIX_16K_80000;
311                break;
312              case 0x259:
313                regNum = MISCREG_MTRR_FIX_16K_A0000;
314                break;
315              case 0x268:
316                regNum = MISCREG_MTRR_FIX_4K_C0000;
317                break;
318              case 0x269:
319                regNum = MISCREG_MTRR_FIX_4K_C8000;
320                break;
321              case 0x26A:
322                regNum = MISCREG_MTRR_FIX_4K_D0000;
323                break;
324              case 0x26B:
325                regNum = MISCREG_MTRR_FIX_4K_D8000;
326                break;
327              case 0x26C:
328                regNum = MISCREG_MTRR_FIX_4K_E0000;
329                break;
330              case 0x26D:
331                regNum = MISCREG_MTRR_FIX_4K_E8000;
332                break;
333              case 0x26E:
334                regNum = MISCREG_MTRR_FIX_4K_F0000;
335                break;
336              case 0x26F:
337                regNum = MISCREG_MTRR_FIX_4K_F8000;
338                break;
339              case 0x277:
340                regNum = MISCREG_PAT;
341                break;
342              case 0x2FF:
343                regNum = MISCREG_DEF_TYPE;
344                break;
345              case 0x400:
346                regNum = MISCREG_MC0_CTL;
347                break;
348              case 0x404:
349                regNum = MISCREG_MC1_CTL;
350                break;
351              case 0x408:
352                regNum = MISCREG_MC2_CTL;
353                break;
354              case 0x40C:
355                regNum = MISCREG_MC3_CTL;
356                break;
357              case 0x410:
358                regNum = MISCREG_MC4_CTL;
359                break;
360              case 0x414:
361                regNum = MISCREG_MC5_CTL;
362                break;
363              case 0x418:
364                regNum = MISCREG_MC6_CTL;
365                break;
366              case 0x41C:
367                regNum = MISCREG_MC7_CTL;
368                break;
369              case 0x401:
370                regNum = MISCREG_MC0_STATUS;
371                break;
372              case 0x405:
373                regNum = MISCREG_MC1_STATUS;
374                break;
375              case 0x409:
376                regNum = MISCREG_MC2_STATUS;
377                break;
378              case 0x40D:
379                regNum = MISCREG_MC3_STATUS;
380                break;
381              case 0x411:
382                regNum = MISCREG_MC4_STATUS;
383                break;
384              case 0x415:
385                regNum = MISCREG_MC5_STATUS;
386                break;
387              case 0x419:
388                regNum = MISCREG_MC6_STATUS;
389                break;
390              case 0x41D:
391                regNum = MISCREG_MC7_STATUS;
392                break;
393              case 0x402:
394                regNum = MISCREG_MC0_ADDR;
395                break;
396              case 0x406:
397                regNum = MISCREG_MC1_ADDR;
398                break;
399              case 0x40A:
400                regNum = MISCREG_MC2_ADDR;
401                break;
402              case 0x40E:
403                regNum = MISCREG_MC3_ADDR;
404                break;
405              case 0x412:
406                regNum = MISCREG_MC4_ADDR;
407                break;
408              case 0x416:
409                regNum = MISCREG_MC5_ADDR;
410                break;
411              case 0x41A:
412                regNum = MISCREG_MC6_ADDR;
413                break;
414              case 0x41E:
415                regNum = MISCREG_MC7_ADDR;
416                break;
417              case 0x403:
418                regNum = MISCREG_MC0_MISC;
419                break;
420              case 0x407:
421                regNum = MISCREG_MC1_MISC;
422                break;
423              case 0x40B:
424                regNum = MISCREG_MC2_MISC;
425                break;
426              case 0x40F:
427                regNum = MISCREG_MC3_MISC;
428                break;
429              case 0x413:
430                regNum = MISCREG_MC4_MISC;
431                break;
432              case 0x417:
433                regNum = MISCREG_MC5_MISC;
434                break;
435              case 0x41B:
436                regNum = MISCREG_MC6_MISC;
437                break;
438              case 0x41F:
439                regNum = MISCREG_MC7_MISC;
440                break;
441              case 0xC0000080:
442                regNum = MISCREG_EFER;
443                break;
444              case 0xC0000081:
445                regNum = MISCREG_STAR;
446                break;
447              case 0xC0000082:
448                regNum = MISCREG_LSTAR;
449                break;
450              case 0xC0000083:
451                regNum = MISCREG_CSTAR;
452                break;
453              case 0xC0000084:
454                regNum = MISCREG_SF_MASK;
455                break;
456              case 0xC0000100:
457                regNum = MISCREG_FS_BASE;
458                break;
459              case 0xC0000101:
460                regNum = MISCREG_GS_BASE;
461                break;
462              case 0xC0000102:
463                regNum = MISCREG_KERNEL_GS_BASE;
464                break;
465              case 0xC0000103:
466                regNum = MISCREG_TSC_AUX;
467                break;
468              case 0xC0010000:
469                regNum = MISCREG_PERF_EVT_SEL0;
470                break;
471              case 0xC0010001:
472                regNum = MISCREG_PERF_EVT_SEL1;
473                break;
474              case 0xC0010002:
475                regNum = MISCREG_PERF_EVT_SEL2;
476                break;
477              case 0xC0010003:
478                regNum = MISCREG_PERF_EVT_SEL3;
479                break;
480              case 0xC0010004:
481                regNum = MISCREG_PERF_EVT_CTR0;
482                break;
483              case 0xC0010005:
484                regNum = MISCREG_PERF_EVT_CTR1;
485                break;
486              case 0xC0010006:
487                regNum = MISCREG_PERF_EVT_CTR2;
488                break;
489              case 0xC0010007:
490                regNum = MISCREG_PERF_EVT_CTR3;
491                break;
492              case 0xC0010010:
493                regNum = MISCREG_SYSCFG;
494                break;
495              case 0xC0010016:
496                regNum = MISCREG_IORR_BASE0;
497                break;
498              case 0xC0010017:
499                regNum = MISCREG_IORR_BASE1;
500                break;
501              case 0xC0010018:
502                regNum = MISCREG_IORR_MASK0;
503                break;
504              case 0xC0010019:
505                regNum = MISCREG_IORR_MASK1;
506                break;
507              case 0xC001001A:
508                regNum = MISCREG_TOP_MEM;
509                break;
510              case 0xC001001D:
511                regNum = MISCREG_TOP_MEM2;
512                break;
513              case 0xC0010114:
514                regNum = MISCREG_VM_CR;
515                break;
516              case 0xC0010115:
517                regNum = MISCREG_IGNNE;
518                break;
519              case 0xC0010116:
520                regNum = MISCREG_SMM_CTL;
521                break;
522              case 0xC0010117:
523                regNum = MISCREG_VM_HSAVE_PA;
524                break;
525              default:
526                return new GeneralProtection(0);
527            }
528            //The index is multiplied by the size of a MiscReg so that
529            //any memory dependence calculations will not see these as
530            //overlapping.
531            req->setPaddr(regNum * sizeof(MiscReg));
532            return NoFault;
533        } else if (prefix == IntAddrPrefixIO) {
534            // TODO If CPL > IOPL or in virtual mode, check the I/O permission
535            // bitmap in the TSS.
536
537            Addr IOPort = vaddr & ~IntAddrPrefixMask;
538            // Make sure the address fits in the expected 16 bit IO address
539            // space.
540            assert(!(IOPort & ~0xFFFF));
541            if (IOPort == 0xCF8 && req->getSize() == 4) {
542                req->setMmapedIpr(true);
543                req->setPaddr(MISCREG_PCI_CONFIG_ADDRESS * sizeof(MiscReg));
544            } else if ((IOPort & ~mask(2)) == 0xCFC) {
545                Addr configAddress =
546                    tc->readMiscRegNoEffect(MISCREG_PCI_CONFIG_ADDRESS);
547                if (bits(configAddress, 31, 31)) {
548                    req->setPaddr(PhysAddrPrefixPciConfig |
549                            mbits(configAddress, 30, 2) |
550                            (IOPort & mask(2)));
551                }
552            } else {
553                req->setPaddr(PhysAddrPrefixIO | IOPort);
554            }
555            return NoFault;
556        } else {
557            panic("Access to unrecognized internal address space %#x.\n",
558                    prefix);
559        }
560    }
561
562    // Get cr0. This will tell us how to do translation. We'll assume it was
563    // verified to be correct and consistent when set.
564    CR0 cr0 = tc->readMiscRegNoEffect(MISCREG_CR0);
565
566    // If protected mode has been enabled...
567    if (cr0.pe) {
568        DPRINTF(TLB, "In protected mode.\n");
569        Efer efer = tc->readMiscRegNoEffect(MISCREG_EFER);
570        SegAttr csAttr = tc->readMiscRegNoEffect(MISCREG_CS_ATTR);
571        // If we're not in 64-bit mode, do protection/limit checks
572        if (!efer.lma || !csAttr.longMode) {
573            DPRINTF(TLB, "Not in long mode. Checking segment protection.\n");
574            // Check for a NULL segment selector.
575            if (!tc->readMiscRegNoEffect(MISCREG_SEG_SEL(seg)))
576                return new GeneralProtection(0);
577            bool expandDown = false;
578            if (seg >= SEGMENT_REG_ES && seg <= SEGMENT_REG_HS) {
579                SegAttr attr = tc->readMiscRegNoEffect(MISCREG_SEG_ATTR(seg));
580                if (!attr.writable && write)
581                    return new GeneralProtection(0);
582                if (!attr.readable && !write && !execute)
583                    return new GeneralProtection(0);
584                expandDown = attr.expandDown;
585            }
586            Addr base = tc->readMiscRegNoEffect(MISCREG_SEG_BASE(seg));
587            Addr limit = tc->readMiscRegNoEffect(MISCREG_SEG_LIMIT(seg));
588            if (expandDown) {
589                DPRINTF(TLB, "Checking an expand down segment.\n");
590                // We don't have to worry about the access going around the
591                // end of memory because accesses will be broken up into
592                // pieces at boundaries aligned on sizes smaller than an
593                // entire address space. We do have to worry about the limit
594                // being less than the base.
595                if (limit < base) {
596                    if (limit < vaddr + req->getSize() && vaddr < base)
597                        return new GeneralProtection(0);
598                } else {
599                    if (limit < vaddr + req->getSize())
600                        return new GeneralProtection(0);
601                }
602            } else {
603                if (limit < base) {
604                    if (vaddr <= limit || vaddr + req->getSize() >= base)
605                        return new GeneralProtection(0);
606                } else {
607                    if (vaddr <= limit && vaddr + req->getSize() >= base)
608                        return new GeneralProtection(0);
609                }
610            }
611        }
612        // If paging is enabled, do the translation.
613        if (cr0.pg) {
614            DPRINTF(TLB, "Paging enabled.\n");
615            // The vaddr already has the segment base applied.
616            TlbEntry *entry = lookup(vaddr);
617            if (!entry) {
618#if FULL_SYSTEM
619                Fault fault = walker->start(tc, translation, req,
620                                            write, execute);
621                if (timing || fault != NoFault) {
622                    // This gets ignored in atomic mode.
623                    delayedResponse = true;
624                    return fault;
625                }
626                entry = lookup(vaddr);
627                assert(entry);
628#else
629                DPRINTF(TLB, "Handling a TLB miss for "
630                        "address %#x at pc %#x.\n",
631                        vaddr, tc->readPC());
632
633                Process *p = tc->getProcessPtr();
634                TlbEntry newEntry;
635                bool success = p->pTable->lookup(vaddr, newEntry);
636                if(!success && !execute) {
637                    p->checkAndAllocNextPage(vaddr);
638                    success = p->pTable->lookup(vaddr, newEntry);
639                }
640                if(!success) {
641                    panic("Tried to execute unmapped address %#x.\n", vaddr);
642                } else {
643                    Addr alignedVaddr = p->pTable->pageAlign(vaddr);
644                    DPRINTF(TLB, "Mapping %#x to %#x\n", alignedVaddr,
645                            newEntry.pageStart());
646                    entry = insert(alignedVaddr, newEntry);
647                }
648                DPRINTF(TLB, "Miss was serviced.\n");
649#endif
650            }
651            // Do paging protection checks.
652            bool inUser = (csAttr.dpl == 3 &&
653                    !(flags & (CPL0FlagBit << FlagShift)));
654            if (inUser && !entry->user ||
655                    write && !entry->writable) {
656                // The page must have been present to get into the TLB in
657                // the first place. We'll assume the reserved bits are
658                // fine even though we're not checking them.
659                return new PageFault(vaddr, true, write,
660                                     inUser, false, execute);
661            }
662
663
664            DPRINTF(TLB, "Entry found with paddr %#x, "
665                    "doing protection checks.\n", entry->paddr);
666            Addr paddr = entry->paddr | (vaddr & (entry->size-1));
667            DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, paddr);
668            req->setPaddr(paddr);
669        } else {
670            //Use the address which already has segmentation applied.
671            DPRINTF(TLB, "Paging disabled.\n");
672            DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, vaddr);
673            req->setPaddr(vaddr);
674        }
675    } else {
676        // Real mode
677        DPRINTF(TLB, "In real mode.\n");
678        DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, vaddr);
679        req->setPaddr(vaddr);
680    }
681    // Check for an access to the local APIC
682#if FULL_SYSTEM
683    LocalApicBase localApicBase = tc->readMiscRegNoEffect(MISCREG_APIC_BASE);
684    Addr baseAddr = localApicBase.base * PageBytes;
685    Addr paddr = req->getPaddr();
686    if (baseAddr <= paddr && baseAddr + PageBytes > paddr) {
687        // The Intel developer's manuals say the below restrictions apply,
688        // but the linux kernel, because of a compiler optimization, breaks
689        // them.
690        /*
691        // Check alignment
692        if (paddr & ((32/8) - 1))
693            return new GeneralProtection(0);
694        // Check access size
695        if (req->getSize() != (32/8))
696            return new GeneralProtection(0);
697        */
698        // Force the access to be uncacheable.
699        req->setFlags(Request::UNCACHEABLE);
700        req->setPaddr(x86LocalAPICAddress(tc->contextId(), paddr - baseAddr));
701    }
702#endif
703    return NoFault;
704};
705
706Fault
707DTB::translateAtomic(RequestPtr req, ThreadContext *tc, bool write)
708{
709    bool delayedResponse;
710    return TLB::translate(req, tc, NULL, write,
711            false, delayedResponse, false);
712}
713
714void
715DTB::translateTiming(RequestPtr req, ThreadContext *tc,
716        Translation *translation, bool write)
717{
718    bool delayedResponse;
719    assert(translation);
720    Fault fault = TLB::translate(req, tc, translation,
721            write, false, delayedResponse, true);
722    if (!delayedResponse)
723        translation->finish(fault, req, tc, write);
724}
725
726Fault
727ITB::translateAtomic(RequestPtr req, ThreadContext *tc)
728{
729    bool delayedResponse;
730    return TLB::translate(req, tc, NULL, false,
731            true, delayedResponse, false);
732}
733
734void
735ITB::translateTiming(RequestPtr req, ThreadContext *tc,
736        Translation *translation)
737{
738    bool delayedResponse;
739    assert(translation);
740    Fault fault = TLB::translate(req, tc, translation,
741            false, true, delayedResponse, true);
742    if (!delayedResponse)
743        translation->finish(fault, req, tc, false);
744}
745
746#if FULL_SYSTEM
747
748Tick
749DTB::doMmuRegRead(ThreadContext *tc, Packet *pkt)
750{
751    return tc->getCpuPtr()->ticks(1);
752}
753
754Tick
755DTB::doMmuRegWrite(ThreadContext *tc, Packet *pkt)
756{
757    return tc->getCpuPtr()->ticks(1);
758}
759
760#endif
761
762void
763TLB::serialize(std::ostream &os)
764{
765}
766
767void
768TLB::unserialize(Checkpoint *cp, const std::string &section)
769{
770}
771
772void
773DTB::serialize(std::ostream &os)
774{
775    TLB::serialize(os);
776}
777
778void
779DTB::unserialize(Checkpoint *cp, const std::string &section)
780{
781    TLB::unserialize(cp, section);
782}
783
784/* end namespace X86ISA */ }
785
786X86ISA::ITB *
787X86ITBParams::create()
788{
789    return new X86ISA::ITB(this);
790}
791
792X86ISA::DTB *
793X86DTBParams::create()
794{
795    return new X86ISA::DTB(this);
796}
797