tlb.cc revision 5360:02a3af203516 
1/*
2 * Copyright (c) 2007 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/pagetable.hh"
63#include "arch/x86/tlb.hh"
64#include "arch/x86/x86_traits.hh"
65#include "base/bitfield.hh"
66#include "base/trace.hh"
67#include "config/full_system.hh"
68#include "cpu/thread_context.hh"
69#include "cpu/base.hh"
70#include "mem/packet_access.hh"
71#include "mem/request.hh"
72
73#if FULL_SYSTEM
74#include "arch/x86/pagetable_walker.hh"
75#endif
76
77namespace X86ISA {
78
79TLB::TLB(const Params *p) : BaseTLB(p), configAddress(0), size(p->size)
80{
81    tlb = new TlbEntry[size];
82    std::memset(tlb, 0, sizeof(TlbEntry) * size);
83
84    for (int x = 0; x < size; x++)
85        freeList.push_back(&tlb[x]);
86
87#if FULL_SYSTEM
88    walker = p->walker;
89    walker->setTLB(this);
90#endif
91}
92
93void
94TLB::insert(Addr vpn, TlbEntry &entry)
95{
96    //TODO Deal with conflicting entries
97
98    TlbEntry *newEntry = NULL;
99    if (!freeList.empty()) {
100        newEntry = freeList.front();
101        freeList.pop_front();
102    } else {
103        newEntry = entryList.back();
104        entryList.pop_back();
105    }
106    *newEntry = entry;
107    newEntry->vaddr = vpn;
108    entryList.push_front(newEntry);
109}
110
111TLB::EntryList::iterator
112TLB::lookupIt(Addr va, bool update_lru)
113{
114    //TODO make this smarter at some point
115    EntryList::iterator entry;
116    for (entry = entryList.begin(); entry != entryList.end(); entry++) {
117        if ((*entry)->vaddr <= va && (*entry)->vaddr + (*entry)->size > va) {
118            DPRINTF(TLB, "Matched vaddr %#x to entry starting at %#x "
119                    "with size %#x.\n", va, (*entry)->vaddr, (*entry)->size);
120            if (update_lru) {
121                entryList.push_front(*entry);
122                entryList.erase(entry);
123                entry = entryList.begin();
124            }
125            break;
126        }
127    }
128    return entry;
129}
130
131TlbEntry *
132TLB::lookup(Addr va, bool update_lru)
133{
134    EntryList::iterator entry = lookupIt(va, update_lru);
135    if (entry == entryList.end())
136        return NULL;
137    else
138        return *entry;
139}
140
141#if FULL_SYSTEM
142void
143TLB::walk(ThreadContext * _tc, Addr vaddr)
144{
145    walker->start(_tc, vaddr);
146}
147#endif
148
149void
150TLB::invalidateAll()
151{
152    DPRINTF(TLB, "Invalidating all entries.\n");
153    while (!entryList.empty()) {
154        TlbEntry *entry = entryList.front();
155        entryList.pop_front();
156        freeList.push_back(entry);
157    }
158}
159
160void
161TLB::setConfigAddress(uint32_t addr)
162{
163    configAddress = addr;
164}
165
166void
167TLB::invalidateNonGlobal()
168{
169    DPRINTF(TLB, "Invalidating all non global entries.\n");
170    EntryList::iterator entryIt;
171    for (entryIt = entryList.begin(); entryIt != entryList.end();) {
172        if (!(*entryIt)->global) {
173            freeList.push_back(*entryIt);
174            entryList.erase(entryIt++);
175        } else {
176            entryIt++;
177        }
178    }
179}
180
181void
182TLB::demapPage(Addr va, uint64_t asn)
183{
184    EntryList::iterator entry = lookupIt(va, false);
185    if (entry != entryList.end()) {
186        freeList.push_back(*entry);
187        entryList.erase(entry);
188    }
189}
190
191template<class TlbFault>
192Fault
193TLB::translate(RequestPtr &req, ThreadContext *tc, bool write, bool execute)
194{
195    Addr vaddr = req->getVaddr();
196    DPRINTF(TLB, "Translating vaddr %#x.\n", vaddr);
197    uint32_t flags = req->getFlags();
198    bool storeCheck = flags & StoreCheck;
199
200    int seg = flags & mask(4);
201
202    //XXX Junk code to surpress the warning
203    if (storeCheck);
204
205    // If this is true, we're dealing with a request to read an internal
206    // value.
207    if (seg == SEGMENT_REG_MS) {
208        DPRINTF(TLB, "Addresses references internal memory.\n");
209        Addr prefix = vaddr & IntAddrPrefixMask;
210        if (prefix == IntAddrPrefixCPUID) {
211            panic("CPUID memory space not yet implemented!\n");
212        } else if (prefix == IntAddrPrefixMSR) {
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 0x401:
361                regNum = MISCREG_MC0_STATUS;
362                break;
363              case 0x405:
364                regNum = MISCREG_MC1_STATUS;
365                break;
366              case 0x409:
367                regNum = MISCREG_MC2_STATUS;
368                break;
369              case 0x40D:
370                regNum = MISCREG_MC3_STATUS;
371                break;
372              case 0x411:
373                regNum = MISCREG_MC4_STATUS;
374                break;
375              case 0x402:
376                regNum = MISCREG_MC0_ADDR;
377                break;
378              case 0x406:
379                regNum = MISCREG_MC1_ADDR;
380                break;
381              case 0x40A:
382                regNum = MISCREG_MC2_ADDR;
383                break;
384              case 0x40E:
385                regNum = MISCREG_MC3_ADDR;
386                break;
387              case 0x412:
388                regNum = MISCREG_MC4_ADDR;
389                break;
390              case 0x403:
391                regNum = MISCREG_MC0_MISC;
392                break;
393              case 0x407:
394                regNum = MISCREG_MC1_MISC;
395                break;
396              case 0x40B:
397                regNum = MISCREG_MC2_MISC;
398                break;
399              case 0x40F:
400                regNum = MISCREG_MC3_MISC;
401                break;
402              case 0x413:
403                regNum = MISCREG_MC4_MISC;
404                break;
405              case 0xC0000080:
406                regNum = MISCREG_EFER;
407                break;
408              case 0xC0000081:
409                regNum = MISCREG_STAR;
410                break;
411              case 0xC0000082:
412                regNum = MISCREG_LSTAR;
413                break;
414              case 0xC0000083:
415                regNum = MISCREG_CSTAR;
416                break;
417              case 0xC0000084:
418                regNum = MISCREG_SF_MASK;
419                break;
420              case 0xC0000100:
421                regNum = MISCREG_FS_BASE;
422                break;
423              case 0xC0000101:
424                regNum = MISCREG_GS_BASE;
425                break;
426              case 0xC0000102:
427                regNum = MISCREG_KERNEL_GS_BASE;
428                break;
429              case 0xC0000103:
430                regNum = MISCREG_TSC_AUX;
431                break;
432              case 0xC0010000:
433                regNum = MISCREG_PERF_EVT_SEL0;
434                break;
435              case 0xC0010001:
436                regNum = MISCREG_PERF_EVT_SEL1;
437                break;
438              case 0xC0010002:
439                regNum = MISCREG_PERF_EVT_SEL2;
440                break;
441              case 0xC0010003:
442                regNum = MISCREG_PERF_EVT_SEL3;
443                break;
444              case 0xC0010004:
445                regNum = MISCREG_PERF_EVT_CTR0;
446                break;
447              case 0xC0010005:
448                regNum = MISCREG_PERF_EVT_CTR1;
449                break;
450              case 0xC0010006:
451                regNum = MISCREG_PERF_EVT_CTR2;
452                break;
453              case 0xC0010007:
454                regNum = MISCREG_PERF_EVT_CTR3;
455                break;
456              case 0xC0010010:
457                regNum = MISCREG_SYSCFG;
458                break;
459              case 0xC0010016:
460                regNum = MISCREG_IORR_BASE0;
461                break;
462              case 0xC0010017:
463                regNum = MISCREG_IORR_BASE1;
464                break;
465              case 0xC0010018:
466                regNum = MISCREG_IORR_MASK0;
467                break;
468              case 0xC0010019:
469                regNum = MISCREG_IORR_MASK1;
470                break;
471              case 0xC001001A:
472                regNum = MISCREG_TOP_MEM;
473                break;
474              case 0xC001001D:
475                regNum = MISCREG_TOP_MEM2;
476                break;
477              case 0xC0010114:
478                regNum = MISCREG_VM_CR;
479                break;
480              case 0xC0010115:
481                regNum = MISCREG_IGNNE;
482                break;
483              case 0xC0010116:
484                regNum = MISCREG_SMM_CTL;
485                break;
486              case 0xC0010117:
487                regNum = MISCREG_VM_HSAVE_PA;
488                break;
489              default:
490                return new GeneralProtection(0);
491            }
492            //The index is multiplied by the size of a MiscReg so that
493            //any memory dependence calculations will not see these as
494            //overlapping.
495            req->setPaddr(regNum * sizeof(MiscReg));
496            return NoFault;
497        } else if (prefix == IntAddrPrefixIO) {
498            // TODO If CPL > IOPL or in virtual mode, check the I/O permission
499            // bitmap in the TSS.
500
501            Addr IOPort = vaddr & ~IntAddrPrefixMask;
502            // Make sure the address fits in the expected 16 bit IO address
503            // space.
504            assert(!(IOPort & ~0xFFFF));
505            if (IOPort == 0xCF8 && req->getSize() == 4) {
506                req->setMmapedIpr(true);
507                req->setPaddr(MISCREG_PCI_CONFIG_ADDRESS * sizeof(MiscReg));
508            } else if ((IOPort & ~mask(2)) == 0xCFC) {
509                Addr configAddress =
510                    tc->readMiscRegNoEffect(MISCREG_PCI_CONFIG_ADDRESS);
511                if (bits(configAddress, 31, 31)) {
512                    req->setPaddr(PhysAddrPrefixPciConfig |
513                            bits(configAddress, 30, 0));
514                }
515            } else {
516                req->setPaddr(PhysAddrPrefixIO | IOPort);
517            }
518            return NoFault;
519        } else {
520            panic("Access to unrecognized internal address space %#x.\n",
521                    prefix);
522        }
523    }
524
525    // Get cr0. This will tell us how to do translation. We'll assume it was
526    // verified to be correct and consistent when set.
527    CR0 cr0 = tc->readMiscRegNoEffect(MISCREG_CR0);
528
529    // If protected mode has been enabled...
530    if (cr0.pe) {
531        DPRINTF(TLB, "In protected mode.\n");
532        Efer efer = tc->readMiscRegNoEffect(MISCREG_EFER);
533        SegAttr csAttr = tc->readMiscRegNoEffect(MISCREG_CS_ATTR);
534        // If we're not in 64-bit mode, do protection/limit checks
535        if (!efer.lma || !csAttr.longMode) {
536            DPRINTF(TLB, "Not in long mode. Checking segment protection.\n");
537            SegAttr attr = tc->readMiscRegNoEffect(MISCREG_SEG_ATTR(seg));
538            if (!attr.writable && write)
539                return new GeneralProtection(0);
540            if (!attr.readable && !write && !execute)
541                return new GeneralProtection(0);
542            Addr base = tc->readMiscRegNoEffect(MISCREG_SEG_BASE(seg));
543            Addr limit = tc->readMiscRegNoEffect(MISCREG_SEG_LIMIT(seg));
544            if (!attr.expandDown) {
545                DPRINTF(TLB, "Checking an expand down segment.\n");
546                // We don't have to worry about the access going around the
547                // end of memory because accesses will be broken up into
548                // pieces at boundaries aligned on sizes smaller than an
549                // entire address space. We do have to worry about the limit
550                // being less than the base.
551                if (limit < base) {
552                    if (limit < vaddr + req->getSize() && vaddr < base)
553                        return new GeneralProtection(0);
554                } else {
555                    if (limit < vaddr + req->getSize())
556                        return new GeneralProtection(0);
557                }
558            } else {
559                if (limit < base) {
560                    if (vaddr <= limit || vaddr + req->getSize() >= base)
561                        return new GeneralProtection(0);
562                } else {
563                    if (vaddr <= limit && vaddr + req->getSize() >= base)
564                        return new GeneralProtection(0);
565                }
566            }
567        }
568        // If paging is enabled, do the translation.
569        if (cr0.pg) {
570            DPRINTF(TLB, "Paging enabled.\n");
571            // The vaddr already has the segment base applied.
572            TlbEntry *entry = lookup(vaddr);
573            if (!entry) {
574                return new TlbFault(vaddr);
575            } else {
576                // Do paging protection checks.
577                DPRINTF(TLB, "Entry found with paddr %#x, doing protection checks.\n", entry->paddr);
578                Addr paddr = entry->paddr | (vaddr & (entry->size-1));
579                DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, paddr);
580                req->setPaddr(paddr);
581            }
582        } else {
583            //Use the address which already has segmentation applied.
584            DPRINTF(TLB, "Paging disabled.\n");
585            DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, vaddr);
586            req->setPaddr(vaddr);
587        }
588    } else {
589        // Real mode
590        DPRINTF(TLB, "In real mode.\n");
591        DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, vaddr);
592        req->setPaddr(vaddr);
593    }
594    // Check for an access to the local APIC
595    LocalApicBase localApicBase = tc->readMiscRegNoEffect(MISCREG_APIC_BASE);
596    Addr baseAddr = localApicBase.base << 12;
597    Addr paddr = req->getPaddr();
598    if (baseAddr <= paddr && baseAddr + (1 << 12) > paddr) {
599        req->setMmapedIpr(true);
600        // Check alignment
601        if (paddr & ((32/8) - 1))
602            return new GeneralProtection(0);
603        // Check access size
604        if (req->getSize() != (32/8))
605            return new GeneralProtection(0);
606        MiscReg regNum;
607        switch (paddr - baseAddr)
608        {
609          case 0x20:
610            regNum = MISCREG_APIC_ID;
611            break;
612          case 0x30:
613            regNum = MISCREG_APIC_VERSION;
614            break;
615          case 0x80:
616            regNum = MISCREG_APIC_TASK_PRIORITY;
617            break;
618          case 0x90:
619            regNum = MISCREG_APIC_ARBITRATION_PRIORITY;
620            break;
621          case 0xA0:
622            regNum = MISCREG_APIC_PROCESSOR_PRIORITY;
623            break;
624          case 0xB0:
625            regNum = MISCREG_APIC_EOI;
626            break;
627          case 0xD0:
628            regNum = MISCREG_APIC_LOGICAL_DESTINATION;
629            break;
630          case 0xE0:
631            regNum = MISCREG_APIC_DESTINATION_FORMAT;
632            break;
633          case 0xF0:
634            regNum = MISCREG_APIC_SPURIOUS_INTERRUPT_VECTOR;
635            break;
636          case 0x100:
637          case 0x108:
638          case 0x110:
639          case 0x118:
640          case 0x120:
641          case 0x128:
642          case 0x130:
643          case 0x138:
644          case 0x140:
645          case 0x148:
646          case 0x150:
647          case 0x158:
648          case 0x160:
649          case 0x168:
650          case 0x170:
651          case 0x178:
652            regNum = MISCREG_APIC_IN_SERVICE(
653                    (paddr - baseAddr - 0x100) / 0x8);
654            break;
655          case 0x180:
656          case 0x188:
657          case 0x190:
658          case 0x198:
659          case 0x1A0:
660          case 0x1A8:
661          case 0x1B0:
662          case 0x1B8:
663          case 0x1C0:
664          case 0x1C8:
665          case 0x1D0:
666          case 0x1D8:
667          case 0x1E0:
668          case 0x1E8:
669          case 0x1F0:
670          case 0x1F8:
671            regNum = MISCREG_APIC_TRIGGER_MODE(
672                    (paddr - baseAddr - 0x180) / 0x8);
673            break;
674          case 0x200:
675          case 0x208:
676          case 0x210:
677          case 0x218:
678          case 0x220:
679          case 0x228:
680          case 0x230:
681          case 0x238:
682          case 0x240:
683          case 0x248:
684          case 0x250:
685          case 0x258:
686          case 0x260:
687          case 0x268:
688          case 0x270:
689          case 0x278:
690            regNum = MISCREG_APIC_INTERRUPT_REQUEST(
691                    (paddr - baseAddr - 0x200) / 0x8);
692            break;
693          case 0x280:
694            regNum = MISCREG_APIC_ERROR_STATUS;
695            break;
696          case 0x300:
697            regNum = MISCREG_APIC_INTERRUPT_COMMAND_LOW;
698            break;
699          case 0x310:
700            regNum = MISCREG_APIC_INTERRUPT_COMMAND_HIGH;
701            break;
702          case 0x320:
703            regNum = MISCREG_APIC_LVT_TIMER;
704            break;
705          case 0x330:
706            regNum = MISCREG_APIC_LVT_THERMAL_SENSOR;
707            break;
708          case 0x340:
709            regNum = MISCREG_APIC_LVT_PERFORMANCE_MONITORING_COUNTERS;
710            break;
711          case 0x350:
712            regNum = MISCREG_APIC_LVT_LINT0;
713            break;
714          case 0x360:
715            regNum = MISCREG_APIC_LVT_LINT1;
716            break;
717          case 0x370:
718            regNum = MISCREG_APIC_LVT_ERROR;
719            break;
720          case 0x380:
721            regNum = MISCREG_APIC_INITIAL_COUNT;
722            break;
723          case 0x390:
724            regNum = MISCREG_APIC_CURRENT_COUNT;
725            break;
726          case 0x3E0:
727            regNum = MISCREG_APIC_DIVIDE_COUNT;
728            break;
729          default:
730            // A reserved register field.
731            return new GeneralProtection(0);
732            break;
733        }
734        req->setPaddr(regNum * sizeof(MiscReg));
735    }
736    return NoFault;
737};
738
739Fault
740DTB::translate(RequestPtr &req, ThreadContext *tc, bool write)
741{
742    return TLB::translate<FakeDTLBFault>(req, tc, write, false);
743}
744
745Fault
746ITB::translate(RequestPtr &req, ThreadContext *tc)
747{
748    return TLB::translate<FakeITLBFault>(req, tc, false, true);
749}
750
751#if FULL_SYSTEM
752
753Tick
754DTB::doMmuRegRead(ThreadContext *tc, Packet *pkt)
755{
756    return tc->getCpuPtr()->ticks(1);
757}
758
759Tick
760DTB::doMmuRegWrite(ThreadContext *tc, Packet *pkt)
761{
762    return tc->getCpuPtr()->ticks(1);
763}
764
765#endif
766
767void
768TLB::serialize(std::ostream &os)
769{
770}
771
772void
773TLB::unserialize(Checkpoint *cp, const std::string &section)
774{
775}
776
777void
778DTB::serialize(std::ostream &os)
779{
780    TLB::serialize(os);
781}
782
783void
784DTB::unserialize(Checkpoint *cp, const std::string &section)
785{
786    TLB::unserialize(cp, section);
787}
788
789/* end namespace X86ISA */ }
790
791X86ISA::ITB *
792X86ITBParams::create()
793{
794    return new X86ISA::ITB(this);
795}
796
797X86ISA::DTB *
798X86DTBParams::create()
799{
800    return new X86ISA::DTB(this);
801}
802