tlb.cc revision 5245 
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) : SimObject(p), 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
111TlbEntry *
112TLB::lookup(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            TlbEntry *e = *entry;
121            if (update_lru) {
122                entryList.erase(entry);
123                entryList.push_front(e);
124            }
125            return e;
126        }
127    }
128    return NULL;
129}
130
131#if FULL_SYSTEM
132void
133TLB::walk(ThreadContext * _tc, Addr vaddr)
134{
135    walker->start(_tc, vaddr);
136}
137#endif
138
139void
140TLB::invalidateAll()
141{
142    DPRINTF(TLB, "Invalidating all entries.\n");
143    while (!entryList.empty()) {
144        TlbEntry *entry = entryList.front();
145        entryList.pop_front();
146        freeList.push_back(entry);
147    }
148}
149
150void
151TLB::invalidateNonGlobal()
152{
153    DPRINTF(TLB, "Invalidating all non global entries.\n");
154    EntryList::iterator entryIt;
155    for (entryIt = entryList.begin(); entryIt != entryList.end();) {
156        if (!(*entryIt)->global) {
157            freeList.push_back(*entryIt);
158            entryList.erase(entryIt++);
159        } else {
160            entryIt++;
161        }
162    }
163}
164
165void
166TLB::demapPage(Addr va)
167{
168}
169
170template<class TlbFault>
171Fault
172TLB::translate(RequestPtr &req, ThreadContext *tc, bool write, bool execute)
173{
174    Addr vaddr = req->getVaddr();
175    DPRINTF(TLB, "Translating vaddr %#x.\n", vaddr);
176    uint32_t flags = req->getFlags();
177    bool storeCheck = flags & StoreCheck;
178
179    int seg = flags & mask(3);
180
181    //XXX Junk code to surpress the warning
182    if (storeCheck);
183
184    // If this is true, we're dealing with a request to read an internal
185    // value.
186    if (seg == SEGMENT_REG_INT) {
187        DPRINTF(TLB, "Addresses references internal memory.\n");
188        Addr prefix = vaddr & IntAddrPrefixMask;
189        if (prefix == IntAddrPrefixCPUID) {
190            panic("CPUID memory space not yet implemented!\n");
191        } else if (prefix == IntAddrPrefixMSR) {
192            req->setMmapedIpr(true);
193            Addr regNum = 0;
194            switch (vaddr & ~IntAddrPrefixMask) {
195              case 0x10:
196                regNum = MISCREG_TSC;
197                break;
198              case 0xFE:
199                regNum = MISCREG_MTRRCAP;
200                break;
201              case 0x174:
202                regNum = MISCREG_SYSENTER_CS;
203                break;
204              case 0x175:
205                regNum = MISCREG_SYSENTER_ESP;
206                break;
207              case 0x176:
208                regNum = MISCREG_SYSENTER_EIP;
209                break;
210              case 0x179:
211                regNum = MISCREG_MCG_CAP;
212                break;
213              case 0x17A:
214                regNum = MISCREG_MCG_STATUS;
215                break;
216              case 0x17B:
217                regNum = MISCREG_MCG_CTL;
218                break;
219              case 0x1D9:
220                regNum = MISCREG_DEBUG_CTL_MSR;
221                break;
222              case 0x1DB:
223                regNum = MISCREG_LAST_BRANCH_FROM_IP;
224                break;
225              case 0x1DC:
226                regNum = MISCREG_LAST_BRANCH_TO_IP;
227                break;
228              case 0x1DD:
229                regNum = MISCREG_LAST_EXCEPTION_FROM_IP;
230                break;
231              case 0x1DE:
232                regNum = MISCREG_LAST_EXCEPTION_TO_IP;
233                break;
234              case 0x200:
235                regNum = MISCREG_MTRR_PHYS_BASE_0;
236                break;
237              case 0x201:
238                regNum = MISCREG_MTRR_PHYS_MASK_0;
239                break;
240              case 0x202:
241                regNum = MISCREG_MTRR_PHYS_BASE_1;
242                break;
243              case 0x203:
244                regNum = MISCREG_MTRR_PHYS_MASK_1;
245                break;
246              case 0x204:
247                regNum = MISCREG_MTRR_PHYS_BASE_2;
248                break;
249              case 0x205:
250                regNum = MISCREG_MTRR_PHYS_MASK_2;
251                break;
252              case 0x206:
253                regNum = MISCREG_MTRR_PHYS_BASE_3;
254                break;
255              case 0x207:
256                regNum = MISCREG_MTRR_PHYS_MASK_3;
257                break;
258              case 0x208:
259                regNum = MISCREG_MTRR_PHYS_BASE_4;
260                break;
261              case 0x209:
262                regNum = MISCREG_MTRR_PHYS_MASK_4;
263                break;
264              case 0x20A:
265                regNum = MISCREG_MTRR_PHYS_BASE_5;
266                break;
267              case 0x20B:
268                regNum = MISCREG_MTRR_PHYS_MASK_5;
269                break;
270              case 0x20C:
271                regNum = MISCREG_MTRR_PHYS_BASE_6;
272                break;
273              case 0x20D:
274                regNum = MISCREG_MTRR_PHYS_MASK_6;
275                break;
276              case 0x20E:
277                regNum = MISCREG_MTRR_PHYS_BASE_7;
278                break;
279              case 0x20F:
280                regNum = MISCREG_MTRR_PHYS_MASK_7;
281                break;
282              case 0x250:
283                regNum = MISCREG_MTRR_FIX_64K_00000;
284                break;
285              case 0x258:
286                regNum = MISCREG_MTRR_FIX_16K_80000;
287                break;
288              case 0x259:
289                regNum = MISCREG_MTRR_FIX_16K_A0000;
290                break;
291              case 0x268:
292                regNum = MISCREG_MTRR_FIX_4K_C0000;
293                break;
294              case 0x269:
295                regNum = MISCREG_MTRR_FIX_4K_C8000;
296                break;
297              case 0x26A:
298                regNum = MISCREG_MTRR_FIX_4K_D0000;
299                break;
300              case 0x26B:
301                regNum = MISCREG_MTRR_FIX_4K_D8000;
302                break;
303              case 0x26C:
304                regNum = MISCREG_MTRR_FIX_4K_E0000;
305                break;
306              case 0x26D:
307                regNum = MISCREG_MTRR_FIX_4K_E8000;
308                break;
309              case 0x26E:
310                regNum = MISCREG_MTRR_FIX_4K_F0000;
311                break;
312              case 0x26F:
313                regNum = MISCREG_MTRR_FIX_4K_F8000;
314                break;
315              case 0x277:
316                regNum = MISCREG_PAT;
317                break;
318              case 0x2FF:
319                regNum = MISCREG_DEF_TYPE;
320                break;
321              case 0x400:
322                regNum = MISCREG_MC0_CTL;
323                break;
324              case 0x404:
325                regNum = MISCREG_MC1_CTL;
326                break;
327              case 0x408:
328                regNum = MISCREG_MC2_CTL;
329                break;
330              case 0x40C:
331                regNum = MISCREG_MC3_CTL;
332                break;
333              case 0x410:
334                regNum = MISCREG_MC4_CTL;
335                break;
336              case 0x401:
337                regNum = MISCREG_MC0_STATUS;
338                break;
339              case 0x405:
340                regNum = MISCREG_MC1_STATUS;
341                break;
342              case 0x409:
343                regNum = MISCREG_MC2_STATUS;
344                break;
345              case 0x40D:
346                regNum = MISCREG_MC3_STATUS;
347                break;
348              case 0x411:
349                regNum = MISCREG_MC4_STATUS;
350                break;
351              case 0x402:
352                regNum = MISCREG_MC0_ADDR;
353                break;
354              case 0x406:
355                regNum = MISCREG_MC1_ADDR;
356                break;
357              case 0x40A:
358                regNum = MISCREG_MC2_ADDR;
359                break;
360              case 0x40E:
361                regNum = MISCREG_MC3_ADDR;
362                break;
363              case 0x412:
364                regNum = MISCREG_MC4_ADDR;
365                break;
366              case 0x403:
367                regNum = MISCREG_MC0_MISC;
368                break;
369              case 0x407:
370                regNum = MISCREG_MC1_MISC;
371                break;
372              case 0x40B:
373                regNum = MISCREG_MC2_MISC;
374                break;
375              case 0x40F:
376                regNum = MISCREG_MC3_MISC;
377                break;
378              case 0x413:
379                regNum = MISCREG_MC4_MISC;
380                break;
381              case 0xC0000080:
382                regNum = MISCREG_EFER;
383                break;
384              case 0xC0000081:
385                regNum = MISCREG_STAR;
386                break;
387              case 0xC0000082:
388                regNum = MISCREG_LSTAR;
389                break;
390              case 0xC0000083:
391                regNum = MISCREG_CSTAR;
392                break;
393              case 0xC0000084:
394                regNum = MISCREG_SF_MASK;
395                break;
396              case 0xC0000100:
397                regNum = MISCREG_FS_BASE;
398                break;
399              case 0xC0000101:
400                regNum = MISCREG_GS_BASE;
401                break;
402              case 0xC0000102:
403                regNum = MISCREG_KERNEL_GS_BASE;
404                break;
405              case 0xC0000103:
406                regNum = MISCREG_TSC_AUX;
407                break;
408              case 0xC0010000:
409                regNum = MISCREG_PERF_EVT_SEL0;
410                break;
411              case 0xC0010001:
412                regNum = MISCREG_PERF_EVT_SEL1;
413                break;
414              case 0xC0010002:
415                regNum = MISCREG_PERF_EVT_SEL2;
416                break;
417              case 0xC0010003:
418                regNum = MISCREG_PERF_EVT_SEL3;
419                break;
420              case 0xC0010004:
421                regNum = MISCREG_PERF_EVT_CTR0;
422                break;
423              case 0xC0010005:
424                regNum = MISCREG_PERF_EVT_CTR1;
425                break;
426              case 0xC0010006:
427                regNum = MISCREG_PERF_EVT_CTR2;
428                break;
429              case 0xC0010007:
430                regNum = MISCREG_PERF_EVT_CTR3;
431                break;
432              case 0xC0010010:
433                regNum = MISCREG_SYSCFG;
434                break;
435              case 0xC0010016:
436                regNum = MISCREG_IORR_BASE0;
437                break;
438              case 0xC0010017:
439                regNum = MISCREG_IORR_BASE1;
440                break;
441              case 0xC0010018:
442                regNum = MISCREG_IORR_MASK0;
443                break;
444              case 0xC0010019:
445                regNum = MISCREG_IORR_MASK1;
446                break;
447              case 0xC001001A:
448                regNum = MISCREG_TOP_MEM;
449                break;
450              case 0xC001001D:
451                regNum = MISCREG_TOP_MEM2;
452                break;
453              case 0xC0010114:
454                regNum = MISCREG_VM_CR;
455                break;
456              case 0xC0010115:
457                regNum = MISCREG_IGNNE;
458                break;
459              case 0xC0010116:
460                regNum = MISCREG_SMM_CTL;
461                break;
462              case 0xC0010117:
463                regNum = MISCREG_VM_HSAVE_PA;
464                break;
465              default:
466                return new GeneralProtection(0);
467            }
468            //The index is multiplied by the size of a MiscReg so that
469            //any memory dependence calculations will not see these as
470            //overlapping.
471            req->setPaddr(regNum * sizeof(MiscReg));
472            return NoFault;
473        } else {
474            panic("Access to unrecognized internal address space %#x.\n",
475                    prefix);
476        }
477    }
478
479    // Get cr0. This will tell us how to do translation. We'll assume it was
480    // verified to be correct and consistent when set.
481    CR0 cr0 = tc->readMiscRegNoEffect(MISCREG_CR0);
482
483    // If protected mode has been enabled...
484    if (cr0.pe) {
485        DPRINTF(TLB, "In protected mode.\n");
486        Efer efer = tc->readMiscRegNoEffect(MISCREG_EFER);
487        SegAttr csAttr = tc->readMiscRegNoEffect(MISCREG_CS_ATTR);
488        // If we're not in 64-bit mode, do protection/limit checks
489        if (!efer.lma || !csAttr.longMode) {
490            DPRINTF(TLB, "Not in long mode. Checking segment protection.\n");
491            SegAttr attr = tc->readMiscRegNoEffect(MISCREG_SEG_ATTR(seg));
492            if (!attr.writable && write)
493                return new GeneralProtection(0);
494            if (!attr.readable && !write && !execute)
495                return new GeneralProtection(0);
496            Addr base = tc->readMiscRegNoEffect(MISCREG_SEG_BASE(seg));
497            Addr limit = tc->readMiscRegNoEffect(MISCREG_SEG_LIMIT(seg));
498            if (!attr.expandDown) {
499                DPRINTF(TLB, "Checking an expand down segment.\n");
500                // We don't have to worry about the access going around the
501                // end of memory because accesses will be broken up into
502                // pieces at boundaries aligned on sizes smaller than an
503                // entire address space. We do have to worry about the limit
504                // being less than the base.
505                if (limit < base) {
506                    if (limit < vaddr + req->getSize() && vaddr < base)
507                        return new GeneralProtection(0);
508                } else {
509                    if (limit < vaddr + req->getSize())
510                        return new GeneralProtection(0);
511                }
512            } else {
513                if (limit < base) {
514                    if (vaddr <= limit || vaddr + req->getSize() >= base)
515                        return new GeneralProtection(0);
516                } else {
517                    if (vaddr <= limit && vaddr + req->getSize() >= base)
518                        return new GeneralProtection(0);
519                }
520            }
521        }
522        // If paging is enabled, do the translation.
523        if (cr0.pg) {
524            DPRINTF(TLB, "Paging enabled.\n");
525            // The vaddr already has the segment base applied.
526            TlbEntry *entry = lookup(vaddr);
527            if (!entry) {
528                return new TlbFault(vaddr);
529            } else {
530                // Do paging protection checks.
531                DPRINTF(TLB, "Entry found with paddr %#x, doing protection checks.\n", entry->paddr);
532                Addr paddr = entry->paddr | (vaddr & (entry->size-1));
533                DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, paddr);
534                req->setPaddr(paddr);
535            }
536        } else {
537            //Use the address which already has segmentation applied.
538            DPRINTF(TLB, "Paging disabled.\n");
539            DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, vaddr);
540            req->setPaddr(vaddr);
541        }
542    } else {
543        // Real mode
544        DPRINTF(TLB, "In real mode.\n");
545        DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, vaddr);
546        req->setPaddr(vaddr);
547    }
548    return NoFault;
549};
550
551Fault
552DTB::translate(RequestPtr &req, ThreadContext *tc, bool write)
553{
554    return TLB::translate<FakeDTLBFault>(req, tc, write, false);
555}
556
557Fault
558ITB::translate(RequestPtr &req, ThreadContext *tc)
559{
560    return TLB::translate<FakeITLBFault>(req, tc, false, true);
561}
562
563#if FULL_SYSTEM
564
565Tick
566DTB::doMmuRegRead(ThreadContext *tc, Packet *pkt)
567{
568    return tc->getCpuPtr()->ticks(1);
569}
570
571Tick
572DTB::doMmuRegWrite(ThreadContext *tc, Packet *pkt)
573{
574    return tc->getCpuPtr()->ticks(1);
575}
576
577#endif
578
579void
580TLB::serialize(std::ostream &os)
581{
582}
583
584void
585TLB::unserialize(Checkpoint *cp, const std::string &section)
586{
587}
588
589void
590DTB::serialize(std::ostream &os)
591{
592    TLB::serialize(os);
593}
594
595void
596DTB::unserialize(Checkpoint *cp, const std::string &section)
597{
598    TLB::unserialize(cp, section);
599}
600
601/* end namespace X86ISA */ }
602
603X86ISA::ITB *
604X86ITBParams::create()
605{
606    return new X86ISA::ITB(this);
607}
608
609X86ISA::DTB *
610X86DTBParams::create()
611{
612    return new X86ISA::DTB(this);
613}
614