tlb.cc revision 6132:916f10213bea 
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, Translation *translation,
190        Mode mode, bool &delayedResponse, bool timing)
191{
192    delayedResponse = false;
193    Addr vaddr = req->getVaddr();
194    DPRINTF(TLB, "Translating vaddr %#x.\n", vaddr);
195    uint32_t flags = req->getFlags();
196    bool storeCheck = flags & (StoreCheck << FlagShift);
197
198    int seg = flags & SegmentFlagMask;
199
200    // If this is true, we're dealing with a request to read an internal
201    // value.
202    if (seg == SEGMENT_REG_MS) {
203        DPRINTF(TLB, "Addresses references internal memory.\n");
204        Addr prefix = (vaddr >> 3) & IntAddrPrefixMask;
205        if (prefix == IntAddrPrefixCPUID) {
206            panic("CPUID memory space not yet implemented!\n");
207        } else if (prefix == IntAddrPrefixMSR) {
208            vaddr = vaddr >> 3;
209            req->setMmapedIpr(true);
210            Addr regNum = 0;
211            switch (vaddr & ~IntAddrPrefixMask) {
212              case 0x10:
213                regNum = MISCREG_TSC;
214                break;
215              case 0x1B:
216                regNum = MISCREG_APIC_BASE;
217                break;
218              case 0xFE:
219                regNum = MISCREG_MTRRCAP;
220                break;
221              case 0x174:
222                regNum = MISCREG_SYSENTER_CS;
223                break;
224              case 0x175:
225                regNum = MISCREG_SYSENTER_ESP;
226                break;
227              case 0x176:
228                regNum = MISCREG_SYSENTER_EIP;
229                break;
230              case 0x179:
231                regNum = MISCREG_MCG_CAP;
232                break;
233              case 0x17A:
234                regNum = MISCREG_MCG_STATUS;
235                break;
236              case 0x17B:
237                regNum = MISCREG_MCG_CTL;
238                break;
239              case 0x1D9:
240                regNum = MISCREG_DEBUG_CTL_MSR;
241                break;
242              case 0x1DB:
243                regNum = MISCREG_LAST_BRANCH_FROM_IP;
244                break;
245              case 0x1DC:
246                regNum = MISCREG_LAST_BRANCH_TO_IP;
247                break;
248              case 0x1DD:
249                regNum = MISCREG_LAST_EXCEPTION_FROM_IP;
250                break;
251              case 0x1DE:
252                regNum = MISCREG_LAST_EXCEPTION_TO_IP;
253                break;
254              case 0x200:
255                regNum = MISCREG_MTRR_PHYS_BASE_0;
256                break;
257              case 0x201:
258                regNum = MISCREG_MTRR_PHYS_MASK_0;
259                break;
260              case 0x202:
261                regNum = MISCREG_MTRR_PHYS_BASE_1;
262                break;
263              case 0x203:
264                regNum = MISCREG_MTRR_PHYS_MASK_1;
265                break;
266              case 0x204:
267                regNum = MISCREG_MTRR_PHYS_BASE_2;
268                break;
269              case 0x205:
270                regNum = MISCREG_MTRR_PHYS_MASK_2;
271                break;
272              case 0x206:
273                regNum = MISCREG_MTRR_PHYS_BASE_3;
274                break;
275              case 0x207:
276                regNum = MISCREG_MTRR_PHYS_MASK_3;
277                break;
278              case 0x208:
279                regNum = MISCREG_MTRR_PHYS_BASE_4;
280                break;
281              case 0x209:
282                regNum = MISCREG_MTRR_PHYS_MASK_4;
283                break;
284              case 0x20A:
285                regNum = MISCREG_MTRR_PHYS_BASE_5;
286                break;
287              case 0x20B:
288                regNum = MISCREG_MTRR_PHYS_MASK_5;
289                break;
290              case 0x20C:
291                regNum = MISCREG_MTRR_PHYS_BASE_6;
292                break;
293              case 0x20D:
294                regNum = MISCREG_MTRR_PHYS_MASK_6;
295                break;
296              case 0x20E:
297                regNum = MISCREG_MTRR_PHYS_BASE_7;
298                break;
299              case 0x20F:
300                regNum = MISCREG_MTRR_PHYS_MASK_7;
301                break;
302              case 0x250:
303                regNum = MISCREG_MTRR_FIX_64K_00000;
304                break;
305              case 0x258:
306                regNum = MISCREG_MTRR_FIX_16K_80000;
307                break;
308              case 0x259:
309                regNum = MISCREG_MTRR_FIX_16K_A0000;
310                break;
311              case 0x268:
312                regNum = MISCREG_MTRR_FIX_4K_C0000;
313                break;
314              case 0x269:
315                regNum = MISCREG_MTRR_FIX_4K_C8000;
316                break;
317              case 0x26A:
318                regNum = MISCREG_MTRR_FIX_4K_D0000;
319                break;
320              case 0x26B:
321                regNum = MISCREG_MTRR_FIX_4K_D8000;
322                break;
323              case 0x26C:
324                regNum = MISCREG_MTRR_FIX_4K_E0000;
325                break;
326              case 0x26D:
327                regNum = MISCREG_MTRR_FIX_4K_E8000;
328                break;
329              case 0x26E:
330                regNum = MISCREG_MTRR_FIX_4K_F0000;
331                break;
332              case 0x26F:
333                regNum = MISCREG_MTRR_FIX_4K_F8000;
334                break;
335              case 0x277:
336                regNum = MISCREG_PAT;
337                break;
338              case 0x2FF:
339                regNum = MISCREG_DEF_TYPE;
340                break;
341              case 0x400:
342                regNum = MISCREG_MC0_CTL;
343                break;
344              case 0x404:
345                regNum = MISCREG_MC1_CTL;
346                break;
347              case 0x408:
348                regNum = MISCREG_MC2_CTL;
349                break;
350              case 0x40C:
351                regNum = MISCREG_MC3_CTL;
352                break;
353              case 0x410:
354                regNum = MISCREG_MC4_CTL;
355                break;
356              case 0x414:
357                regNum = MISCREG_MC5_CTL;
358                break;
359              case 0x418:
360                regNum = MISCREG_MC6_CTL;
361                break;
362              case 0x41C:
363                regNum = MISCREG_MC7_CTL;
364                break;
365              case 0x401:
366                regNum = MISCREG_MC0_STATUS;
367                break;
368              case 0x405:
369                regNum = MISCREG_MC1_STATUS;
370                break;
371              case 0x409:
372                regNum = MISCREG_MC2_STATUS;
373                break;
374              case 0x40D:
375                regNum = MISCREG_MC3_STATUS;
376                break;
377              case 0x411:
378                regNum = MISCREG_MC4_STATUS;
379                break;
380              case 0x415:
381                regNum = MISCREG_MC5_STATUS;
382                break;
383              case 0x419:
384                regNum = MISCREG_MC6_STATUS;
385                break;
386              case 0x41D:
387                regNum = MISCREG_MC7_STATUS;
388                break;
389              case 0x402:
390                regNum = MISCREG_MC0_ADDR;
391                break;
392              case 0x406:
393                regNum = MISCREG_MC1_ADDR;
394                break;
395              case 0x40A:
396                regNum = MISCREG_MC2_ADDR;
397                break;
398              case 0x40E:
399                regNum = MISCREG_MC3_ADDR;
400                break;
401              case 0x412:
402                regNum = MISCREG_MC4_ADDR;
403                break;
404              case 0x416:
405                regNum = MISCREG_MC5_ADDR;
406                break;
407              case 0x41A:
408                regNum = MISCREG_MC6_ADDR;
409                break;
410              case 0x41E:
411                regNum = MISCREG_MC7_ADDR;
412                break;
413              case 0x403:
414                regNum = MISCREG_MC0_MISC;
415                break;
416              case 0x407:
417                regNum = MISCREG_MC1_MISC;
418                break;
419              case 0x40B:
420                regNum = MISCREG_MC2_MISC;
421                break;
422              case 0x40F:
423                regNum = MISCREG_MC3_MISC;
424                break;
425              case 0x413:
426                regNum = MISCREG_MC4_MISC;
427                break;
428              case 0x417:
429                regNum = MISCREG_MC5_MISC;
430                break;
431              case 0x41B:
432                regNum = MISCREG_MC6_MISC;
433                break;
434              case 0x41F:
435                regNum = MISCREG_MC7_MISC;
436                break;
437              case 0xC0000080:
438                regNum = MISCREG_EFER;
439                break;
440              case 0xC0000081:
441                regNum = MISCREG_STAR;
442                break;
443              case 0xC0000082:
444                regNum = MISCREG_LSTAR;
445                break;
446              case 0xC0000083:
447                regNum = MISCREG_CSTAR;
448                break;
449              case 0xC0000084:
450                regNum = MISCREG_SF_MASK;
451                break;
452              case 0xC0000100:
453                regNum = MISCREG_FS_BASE;
454                break;
455              case 0xC0000101:
456                regNum = MISCREG_GS_BASE;
457                break;
458              case 0xC0000102:
459                regNum = MISCREG_KERNEL_GS_BASE;
460                break;
461              case 0xC0000103:
462                regNum = MISCREG_TSC_AUX;
463                break;
464              case 0xC0010000:
465                regNum = MISCREG_PERF_EVT_SEL0;
466                break;
467              case 0xC0010001:
468                regNum = MISCREG_PERF_EVT_SEL1;
469                break;
470              case 0xC0010002:
471                regNum = MISCREG_PERF_EVT_SEL2;
472                break;
473              case 0xC0010003:
474                regNum = MISCREG_PERF_EVT_SEL3;
475                break;
476              case 0xC0010004:
477                regNum = MISCREG_PERF_EVT_CTR0;
478                break;
479              case 0xC0010005:
480                regNum = MISCREG_PERF_EVT_CTR1;
481                break;
482              case 0xC0010006:
483                regNum = MISCREG_PERF_EVT_CTR2;
484                break;
485              case 0xC0010007:
486                regNum = MISCREG_PERF_EVT_CTR3;
487                break;
488              case 0xC0010010:
489                regNum = MISCREG_SYSCFG;
490                break;
491              case 0xC0010016:
492                regNum = MISCREG_IORR_BASE0;
493                break;
494              case 0xC0010017:
495                regNum = MISCREG_IORR_BASE1;
496                break;
497              case 0xC0010018:
498                regNum = MISCREG_IORR_MASK0;
499                break;
500              case 0xC0010019:
501                regNum = MISCREG_IORR_MASK1;
502                break;
503              case 0xC001001A:
504                regNum = MISCREG_TOP_MEM;
505                break;
506              case 0xC001001D:
507                regNum = MISCREG_TOP_MEM2;
508                break;
509              case 0xC0010114:
510                regNum = MISCREG_VM_CR;
511                break;
512              case 0xC0010115:
513                regNum = MISCREG_IGNNE;
514                break;
515              case 0xC0010116:
516                regNum = MISCREG_SMM_CTL;
517                break;
518              case 0xC0010117:
519                regNum = MISCREG_VM_HSAVE_PA;
520                break;
521              default:
522                return new GeneralProtection(0);
523            }
524            //The index is multiplied by the size of a MiscReg so that
525            //any memory dependence calculations will not see these as
526            //overlapping.
527            req->setPaddr(regNum * sizeof(MiscReg));
528            return NoFault;
529        } else if (prefix == IntAddrPrefixIO) {
530            // TODO If CPL > IOPL or in virtual mode, check the I/O permission
531            // bitmap in the TSS.
532
533            Addr IOPort = vaddr & ~IntAddrPrefixMask;
534            // Make sure the address fits in the expected 16 bit IO address
535            // space.
536            assert(!(IOPort & ~0xFFFF));
537            if (IOPort == 0xCF8 && req->getSize() == 4) {
538                req->setMmapedIpr(true);
539                req->setPaddr(MISCREG_PCI_CONFIG_ADDRESS * sizeof(MiscReg));
540            } else if ((IOPort & ~mask(2)) == 0xCFC) {
541                Addr configAddress =
542                    tc->readMiscRegNoEffect(MISCREG_PCI_CONFIG_ADDRESS);
543                if (bits(configAddress, 31, 31)) {
544                    req->setPaddr(PhysAddrPrefixPciConfig |
545                            mbits(configAddress, 30, 2) |
546                            (IOPort & mask(2)));
547                }
548            } else {
549                req->setPaddr(PhysAddrPrefixIO | IOPort);
550            }
551            return NoFault;
552        } else {
553            panic("Access to unrecognized internal address space %#x.\n",
554                    prefix);
555        }
556    }
557
558    // Get cr0. This will tell us how to do translation. We'll assume it was
559    // verified to be correct and consistent when set.
560    CR0 cr0 = tc->readMiscRegNoEffect(MISCREG_CR0);
561
562    // If protected mode has been enabled...
563    if (cr0.pe) {
564        DPRINTF(TLB, "In protected mode.\n");
565        Efer efer = tc->readMiscRegNoEffect(MISCREG_EFER);
566        SegAttr csAttr = tc->readMiscRegNoEffect(MISCREG_CS_ATTR);
567        // If we're not in 64-bit mode, do protection/limit checks
568        if (!efer.lma || !csAttr.longMode) {
569            DPRINTF(TLB, "Not in long mode. Checking segment protection.\n");
570            // Check for a NULL segment selector.
571            if (!(seg == SEGMENT_REG_TSG || seg == SYS_SEGMENT_REG_IDTR ||
572                        seg == SEGMENT_REG_HS || seg == SEGMENT_REG_LS ||
573                        seg == SEGMENT_REG_MS)
574                    && !tc->readMiscRegNoEffect(MISCREG_SEG_SEL(seg)))
575                return new GeneralProtection(0);
576            bool expandDown = false;
577            SegAttr attr = tc->readMiscRegNoEffect(MISCREG_SEG_ATTR(seg));
578            if (seg >= SEGMENT_REG_ES && seg <= SEGMENT_REG_HS) {
579                if (!attr.writable && (mode == Write || storeCheck))
580                    return new GeneralProtection(0);
581                if (!attr.readable && mode == Read)
582                    return new GeneralProtection(0);
583                expandDown = attr.expandDown;
584
585            }
586            Addr base = tc->readMiscRegNoEffect(MISCREG_SEG_BASE(seg));
587            Addr limit = tc->readMiscRegNoEffect(MISCREG_SEG_LIMIT(seg));
588            // This assumes we're not in 64 bit mode. If we were, the default
589            // address size is 64 bits, overridable to 32.
590            int size = 32;
591            bool sizeOverride = (flags & (AddrSizeFlagBit << FlagShift));
592            if ((csAttr.defaultSize && sizeOverride) ||
593                    (!csAttr.defaultSize && !sizeOverride))
594                size = 16;
595            Addr offset = bits(vaddr - base, size-1, 0);
596            Addr endOffset = offset + req->getSize() - 1;
597            if (expandDown) {
598                DPRINTF(TLB, "Checking an expand down segment.\n");
599                warn_once("Expand down segments are untested.\n");
600                if (offset <= limit || endOffset <= limit)
601                    return new GeneralProtection(0);
602            } else {
603                if (offset > limit || endOffset > limit)
604                    return new GeneralProtection(0);
605            }
606        }
607        // If paging is enabled, do the translation.
608        if (cr0.pg) {
609            DPRINTF(TLB, "Paging enabled.\n");
610            // The vaddr already has the segment base applied.
611            TlbEntry *entry = lookup(vaddr);
612            if (!entry) {
613#if FULL_SYSTEM
614                Fault fault = walker->start(tc, translation, req, mode);
615                if (timing || fault != NoFault) {
616                    // This gets ignored in atomic mode.
617                    delayedResponse = true;
618                    return fault;
619                }
620                entry = lookup(vaddr);
621                assert(entry);
622#else
623                DPRINTF(TLB, "Handling a TLB miss for "
624                        "address %#x at pc %#x.\n",
625                        vaddr, tc->readPC());
626
627                Process *p = tc->getProcessPtr();
628                TlbEntry newEntry;
629                bool success = p->pTable->lookup(vaddr, newEntry);
630                if(!success && mode != Execute) {
631                    p->checkAndAllocNextPage(vaddr);
632                    success = p->pTable->lookup(vaddr, newEntry);
633                }
634                if(!success) {
635                    panic("Tried to execute unmapped address %#x.\n", vaddr);
636                } else {
637                    Addr alignedVaddr = p->pTable->pageAlign(vaddr);
638                    DPRINTF(TLB, "Mapping %#x to %#x\n", alignedVaddr,
639                            newEntry.pageStart());
640                    entry = insert(alignedVaddr, newEntry);
641                }
642                DPRINTF(TLB, "Miss was serviced.\n");
643#endif
644            }
645            // Do paging protection checks.
646            bool inUser = (csAttr.dpl == 3 &&
647                    !(flags & (CPL0FlagBit << FlagShift)));
648            if ((inUser && !entry->user) ||
649                (mode == Write && !entry->writable)) {
650                // The page must have been present to get into the TLB in
651                // the first place. We'll assume the reserved bits are
652                // fine even though we're not checking them.
653                return new PageFault(vaddr, true, mode, inUser, false);
654            }
655            if (storeCheck && !entry->writable) {
656                // This would fault if this were a write, so return a page
657                // fault that reflects that happening.
658                return new PageFault(vaddr, true, Write, inUser, false);
659            }
660
661
662            DPRINTF(TLB, "Entry found with paddr %#x, "
663                    "doing protection checks.\n", entry->paddr);
664            Addr paddr = entry->paddr | (vaddr & (entry->size-1));
665            DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, paddr);
666            req->setPaddr(paddr);
667        } else {
668            //Use the address which already has segmentation applied.
669            DPRINTF(TLB, "Paging disabled.\n");
670            DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, vaddr);
671            req->setPaddr(vaddr);
672        }
673    } else {
674        // Real mode
675        DPRINTF(TLB, "In real mode.\n");
676        DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, vaddr);
677        req->setPaddr(vaddr);
678    }
679    // Check for an access to the local APIC
680#if FULL_SYSTEM
681    LocalApicBase localApicBase = tc->readMiscRegNoEffect(MISCREG_APIC_BASE);
682    Addr baseAddr = localApicBase.base * PageBytes;
683    Addr paddr = req->getPaddr();
684    if (baseAddr <= paddr && baseAddr + PageBytes > paddr) {
685        // The Intel developer's manuals say the below restrictions apply,
686        // but the linux kernel, because of a compiler optimization, breaks
687        // them.
688        /*
689        // Check alignment
690        if (paddr & ((32/8) - 1))
691            return new GeneralProtection(0);
692        // Check access size
693        if (req->getSize() != (32/8))
694            return new GeneralProtection(0);
695        */
696        // Force the access to be uncacheable.
697        req->setFlags(Request::UNCACHEABLE);
698        req->setPaddr(x86LocalAPICAddress(tc->contextId(), paddr - baseAddr));
699    }
700#endif
701    return NoFault;
702};
703
704Fault
705TLB::translateAtomic(RequestPtr req, ThreadContext *tc, Mode mode)
706{
707    bool delayedResponse;
708    return TLB::translate(req, tc, NULL, mode, delayedResponse, false);
709}
710
711void
712TLB::translateTiming(RequestPtr req, ThreadContext *tc,
713        Translation *translation, Mode mode)
714{
715    bool delayedResponse;
716    assert(translation);
717    Fault fault =
718        TLB::translate(req, tc, translation, mode, delayedResponse, true);
719    if (!delayedResponse)
720        translation->finish(fault, req, tc, mode);
721}
722
723#if FULL_SYSTEM
724
725Tick
726TLB::doMmuRegRead(ThreadContext *tc, Packet *pkt)
727{
728    return tc->getCpuPtr()->ticks(1);
729}
730
731Tick
732TLB::doMmuRegWrite(ThreadContext *tc, Packet *pkt)
733{
734    return tc->getCpuPtr()->ticks(1);
735}
736
737#endif
738
739void
740TLB::serialize(std::ostream &os)
741{
742}
743
744void
745TLB::unserialize(Checkpoint *cp, const std::string &section)
746{
747}
748
749/* end namespace X86ISA */ }
750
751X86ISA::TLB *
752X86TLBParams::create()
753{
754    return new X86ISA::TLB(this);
755}
756