1#ifndef _ASM_GENERIC_PGTABLE_H
2#define _ASM_GENERIC_PGTABLE_H
3
4#include <linux/pfn.h>
5
6#ifndef __ASSEMBLY__
7#ifdef CONFIG_MMU
8
9#include <linux/mm_types.h>
10#include <linux/bug.h>
11#include <linux/errno.h>
12
13#if 4 - defined(__PAGETABLE_PUD_FOLDED) - defined(__PAGETABLE_PMD_FOLDED) != \
14 CONFIG_PGTABLE_LEVELS
15#error CONFIG_PGTABLE_LEVELS is not consistent with __PAGETABLE_{PUD,PMD}_FOLDED
16#endif
17
18
19
20
21
22
23
24#ifndef USER_PGTABLES_CEILING
25#define USER_PGTABLES_CEILING 0UL
26#endif
27
28#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
29extern int ptep_set_access_flags(struct vm_area_struct *vma,
30 unsigned long address, pte_t *ptep,
31 pte_t entry, int dirty);
32#endif
33
34#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
35#ifdef CONFIG_TRANSPARENT_HUGEPAGE
36extern int pmdp_set_access_flags(struct vm_area_struct *vma,
37 unsigned long address, pmd_t *pmdp,
38 pmd_t entry, int dirty);
39#else
40static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
41 unsigned long address, pmd_t *pmdp,
42 pmd_t entry, int dirty)
43{
44 BUILD_BUG();
45 return 0;
46}
47#endif
48#endif
49
50#ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
51static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
52 unsigned long address,
53 pte_t *ptep)
54{
55 pte_t pte = *ptep;
56 int r = 1;
57 if (!pte_young(pte))
58 r = 0;
59 else
60 set_pte_at(vma->vm_mm, address, ptep, pte_mkold(pte));
61 return r;
62}
63#endif
64
65#ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
66#ifdef CONFIG_TRANSPARENT_HUGEPAGE
67static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
68 unsigned long address,
69 pmd_t *pmdp)
70{
71 pmd_t pmd = *pmdp;
72 int r = 1;
73 if (!pmd_young(pmd))
74 r = 0;
75 else
76 set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd));
77 return r;
78}
79#else
80static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
81 unsigned long address,
82 pmd_t *pmdp)
83{
84 BUILD_BUG();
85 return 0;
86}
87#endif
88#endif
89
90#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
91int ptep_clear_flush_young(struct vm_area_struct *vma,
92 unsigned long address, pte_t *ptep);
93#endif
94
95#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
96#ifdef CONFIG_TRANSPARENT_HUGEPAGE
97extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
98 unsigned long address, pmd_t *pmdp);
99#else
100
101
102
103
104static inline int pmdp_clear_flush_young(struct vm_area_struct *vma,
105 unsigned long address, pmd_t *pmdp)
106{
107 BUILD_BUG();
108 return 0;
109}
110#endif
111#endif
112
113#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
114static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
115 unsigned long address,
116 pte_t *ptep)
117{
118 pte_t pte = *ptep;
119 pte_clear(mm, address, ptep);
120 return pte;
121}
122#endif
123
124#ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
125#ifdef CONFIG_TRANSPARENT_HUGEPAGE
126static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
127 unsigned long address,
128 pmd_t *pmdp)
129{
130 pmd_t pmd = *pmdp;
131 pmd_clear(pmdp);
132 return pmd;
133}
134#endif
135#endif
136
137#ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL
138#ifdef CONFIG_TRANSPARENT_HUGEPAGE
139static inline pmd_t pmdp_huge_get_and_clear_full(struct mm_struct *mm,
140 unsigned long address, pmd_t *pmdp,
141 int full)
142{
143 return pmdp_huge_get_and_clear(mm, address, pmdp);
144}
145#endif
146#endif
147
148#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
149static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
150 unsigned long address, pte_t *ptep,
151 int full)
152{
153 pte_t pte;
154 pte = ptep_get_and_clear(mm, address, ptep);
155 return pte;
156}
157#endif
158
159
160
161
162
163
164#ifndef __HAVE_ARCH_PTE_CLEAR_NOT_PRESENT_FULL
165static inline void pte_clear_not_present_full(struct mm_struct *mm,
166 unsigned long address,
167 pte_t *ptep,
168 int full)
169{
170 pte_clear(mm, address, ptep);
171}
172#endif
173
174#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
175extern pte_t ptep_clear_flush(struct vm_area_struct *vma,
176 unsigned long address,
177 pte_t *ptep);
178#endif
179
180#ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
181extern pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma,
182 unsigned long address,
183 pmd_t *pmdp);
184#endif
185
186#ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
187struct mm_struct;
188static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
189{
190 pte_t old_pte = *ptep;
191 set_pte_at(mm, address, ptep, pte_wrprotect(old_pte));
192}
193#endif
194
195#ifndef __HAVE_ARCH_PMDP_SET_WRPROTECT
196#ifdef CONFIG_TRANSPARENT_HUGEPAGE
197static inline void pmdp_set_wrprotect(struct mm_struct *mm,
198 unsigned long address, pmd_t *pmdp)
199{
200 pmd_t old_pmd = *pmdp;
201 set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd));
202}
203#else
204static inline void pmdp_set_wrprotect(struct mm_struct *mm,
205 unsigned long address, pmd_t *pmdp)
206{
207 BUILD_BUG();
208}
209#endif
210#endif
211
212#ifndef pmdp_collapse_flush
213#ifdef CONFIG_TRANSPARENT_HUGEPAGE
214extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
215 unsigned long address, pmd_t *pmdp);
216#else
217static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
218 unsigned long address,
219 pmd_t *pmdp)
220{
221 BUILD_BUG();
222 return *pmdp;
223}
224#define pmdp_collapse_flush pmdp_collapse_flush
225#endif
226#endif
227
228#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
229extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
230 pgtable_t pgtable);
231#endif
232
233#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
234extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
235#endif
236
237#ifndef __HAVE_ARCH_PMDP_INVALIDATE
238extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
239 pmd_t *pmdp);
240#endif
241
242#ifndef __HAVE_ARCH_PMDP_HUGE_SPLIT_PREPARE
243static inline void pmdp_huge_split_prepare(struct vm_area_struct *vma,
244 unsigned long address, pmd_t *pmdp)
245{
246
247}
248#endif
249
250#ifndef __HAVE_ARCH_PTE_SAME
251static inline int pte_same(pte_t pte_a, pte_t pte_b)
252{
253 return pte_val(pte_a) == pte_val(pte_b);
254}
255#endif
256
257#ifndef __HAVE_ARCH_PTE_UNUSED
258
259
260
261
262
263
264static inline int pte_unused(pte_t pte)
265{
266 return 0;
267}
268#endif
269
270#ifndef __HAVE_ARCH_PMD_SAME
271#ifdef CONFIG_TRANSPARENT_HUGEPAGE
272static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
273{
274 return pmd_val(pmd_a) == pmd_val(pmd_b);
275}
276#else
277static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
278{
279 BUILD_BUG();
280 return 0;
281}
282#endif
283#endif
284
285#ifndef __HAVE_ARCH_PGD_OFFSET_GATE
286#define pgd_offset_gate(mm, addr) pgd_offset(mm, addr)
287#endif
288
289#ifndef __HAVE_ARCH_MOVE_PTE
290#define move_pte(pte, prot, old_addr, new_addr) (pte)
291#endif
292
293#ifndef pte_accessible
294# define pte_accessible(mm, pte) ((void)(pte), 1)
295#endif
296
297#ifndef flush_tlb_fix_spurious_fault
298#define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address)
299#endif
300
301#ifndef pgprot_noncached
302#define pgprot_noncached(prot) (prot)
303#endif
304
305#ifndef pgprot_writecombine
306#define pgprot_writecombine pgprot_noncached
307#endif
308
309#ifndef pgprot_writethrough
310#define pgprot_writethrough pgprot_noncached
311#endif
312
313#ifndef pgprot_device
314#define pgprot_device pgprot_noncached
315#endif
316
317#ifndef pgprot_modify
318#define pgprot_modify pgprot_modify
319static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
320{
321 if (pgprot_val(oldprot) == pgprot_val(pgprot_noncached(oldprot)))
322 newprot = pgprot_noncached(newprot);
323 if (pgprot_val(oldprot) == pgprot_val(pgprot_writecombine(oldprot)))
324 newprot = pgprot_writecombine(newprot);
325 if (pgprot_val(oldprot) == pgprot_val(pgprot_device(oldprot)))
326 newprot = pgprot_device(newprot);
327 return newprot;
328}
329#endif
330
331
332
333
334
335
336
337#define pgd_addr_end(addr, end) \
338({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \
339 (__boundary - 1 < (end) - 1)? __boundary: (end); \
340})
341
342#ifndef pud_addr_end
343#define pud_addr_end(addr, end) \
344({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \
345 (__boundary - 1 < (end) - 1)? __boundary: (end); \
346})
347#endif
348
349#ifndef pmd_addr_end
350#define pmd_addr_end(addr, end) \
351({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \
352 (__boundary - 1 < (end) - 1)? __boundary: (end); \
353})
354#endif
355
356
357
358
359
360
361void pgd_clear_bad(pgd_t *);
362void pud_clear_bad(pud_t *);
363void pmd_clear_bad(pmd_t *);
364
365static inline int pgd_none_or_clear_bad(pgd_t *pgd)
366{
367 if (pgd_none(*pgd))
368 return 1;
369 if (unlikely(pgd_bad(*pgd))) {
370 pgd_clear_bad(pgd);
371 return 1;
372 }
373 return 0;
374}
375
376static inline int pud_none_or_clear_bad(pud_t *pud)
377{
378 if (pud_none(*pud))
379 return 1;
380 if (unlikely(pud_bad(*pud))) {
381 pud_clear_bad(pud);
382 return 1;
383 }
384 return 0;
385}
386
387static inline int pmd_none_or_clear_bad(pmd_t *pmd)
388{
389 if (pmd_none(*pmd))
390 return 1;
391 if (unlikely(pmd_bad(*pmd))) {
392 pmd_clear_bad(pmd);
393 return 1;
394 }
395 return 0;
396}
397
398static inline pte_t __ptep_modify_prot_start(struct mm_struct *mm,
399 unsigned long addr,
400 pte_t *ptep)
401{
402
403
404
405
406
407 return ptep_get_and_clear(mm, addr, ptep);
408}
409
410static inline void __ptep_modify_prot_commit(struct mm_struct *mm,
411 unsigned long addr,
412 pte_t *ptep, pte_t pte)
413{
414
415
416
417
418 set_pte_at(mm, addr, ptep, pte);
419}
420
421#ifndef __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
437 unsigned long addr,
438 pte_t *ptep)
439{
440 return __ptep_modify_prot_start(mm, addr, ptep);
441}
442
443
444
445
446
447static inline void ptep_modify_prot_commit(struct mm_struct *mm,
448 unsigned long addr,
449 pte_t *ptep, pte_t pte)
450{
451 __ptep_modify_prot_commit(mm, addr, ptep, pte);
452}
453#endif
454#endif
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471#ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE
472#define arch_enter_lazy_mmu_mode() do {} while (0)
473#define arch_leave_lazy_mmu_mode() do {} while (0)
474#define arch_flush_lazy_mmu_mode() do {} while (0)
475#endif
476
477
478
479
480
481
482
483
484
485
486
487
488#ifndef __HAVE_ARCH_START_CONTEXT_SWITCH
489#define arch_start_context_switch(prev) do {} while (0)
490#endif
491
492#ifndef CONFIG_HAVE_ARCH_SOFT_DIRTY
493static inline int pte_soft_dirty(pte_t pte)
494{
495 return 0;
496}
497
498static inline int pmd_soft_dirty(pmd_t pmd)
499{
500 return 0;
501}
502
503static inline pte_t pte_mksoft_dirty(pte_t pte)
504{
505 return pte;
506}
507
508static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
509{
510 return pmd;
511}
512
513static inline pte_t pte_clear_soft_dirty(pte_t pte)
514{
515 return pte;
516}
517
518static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
519{
520 return pmd;
521}
522
523static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
524{
525 return pte;
526}
527
528static inline int pte_swp_soft_dirty(pte_t pte)
529{
530 return 0;
531}
532
533static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
534{
535 return pte;
536}
537#endif
538
539#ifndef __HAVE_PFNMAP_TRACKING
540
541
542
543
544
545
546
547
548
549
550static inline int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot,
551 unsigned long pfn, unsigned long addr,
552 unsigned long size)
553{
554 return 0;
555}
556
557
558
559
560
561static inline int track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot,
562 pfn_t pfn)
563{
564 return 0;
565}
566
567
568
569
570
571static inline int track_pfn_copy(struct vm_area_struct *vma)
572{
573 return 0;
574}
575
576
577
578
579
580
581static inline void untrack_pfn(struct vm_area_struct *vma,
582 unsigned long pfn, unsigned long size)
583{
584}
585
586
587
588
589static inline void untrack_pfn_moved(struct vm_area_struct *vma)
590{
591}
592#else
593extern int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot,
594 unsigned long pfn, unsigned long addr,
595 unsigned long size);
596extern int track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot,
597 pfn_t pfn);
598extern int track_pfn_copy(struct vm_area_struct *vma);
599extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn,
600 unsigned long size);
601extern void untrack_pfn_moved(struct vm_area_struct *vma);
602#endif
603
604#ifdef __HAVE_COLOR_ZERO_PAGE
605static inline int is_zero_pfn(unsigned long pfn)
606{
607 extern unsigned long zero_pfn;
608 unsigned long offset_from_zero_pfn = pfn - zero_pfn;
609 return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
610}
611
612#define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr))
613
614#else
615static inline int is_zero_pfn(unsigned long pfn)
616{
617 extern unsigned long zero_pfn;
618 return pfn == zero_pfn;
619}
620
621static inline unsigned long my_zero_pfn(unsigned long addr)
622{
623 extern unsigned long zero_pfn;
624 return zero_pfn;
625}
626#endif
627
628#ifdef CONFIG_MMU
629
630#ifndef CONFIG_TRANSPARENT_HUGEPAGE
631static inline int pmd_trans_huge(pmd_t pmd)
632{
633 return 0;
634}
635#ifndef __HAVE_ARCH_PMD_WRITE
636static inline int pmd_write(pmd_t pmd)
637{
638 BUG();
639 return 0;
640}
641#endif
642#endif
643
644#ifndef pmd_read_atomic
645static inline pmd_t pmd_read_atomic(pmd_t *pmdp)
646{
647
648
649
650
651
652 return *pmdp;
653}
654#endif
655
656#ifndef pmd_move_must_withdraw
657static inline int pmd_move_must_withdraw(spinlock_t *new_pmd_ptl,
658 spinlock_t *old_pmd_ptl)
659{
660
661
662
663
664 return new_pmd_ptl != old_pmd_ptl;
665}
666#endif
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689static inline int pmd_none_or_trans_huge_or_clear_bad(pmd_t *pmd)
690{
691 pmd_t pmdval = pmd_read_atomic(pmd);
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706#ifdef CONFIG_TRANSPARENT_HUGEPAGE
707 barrier();
708#endif
709 if (pmd_none(pmdval) || pmd_trans_huge(pmdval))
710 return 1;
711 if (unlikely(pmd_bad(pmdval))) {
712 pmd_clear_bad(pmd);
713 return 1;
714 }
715 return 0;
716}
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731static inline int pmd_trans_unstable(pmd_t *pmd)
732{
733#ifdef CONFIG_TRANSPARENT_HUGEPAGE
734 return pmd_none_or_trans_huge_or_clear_bad(pmd);
735#else
736 return 0;
737#endif
738}
739
740#ifndef CONFIG_NUMA_BALANCING
741
742
743
744
745
746
747
748
749static inline int pte_protnone(pte_t pte)
750{
751 return 0;
752}
753
754static inline int pmd_protnone(pmd_t pmd)
755{
756 return 0;
757}
758#endif
759
760#endif
761
762#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
763int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot);
764int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot);
765int pud_clear_huge(pud_t *pud);
766int pmd_clear_huge(pmd_t *pmd);
767#else
768static inline int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot)
769{
770 return 0;
771}
772static inline int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot)
773{
774 return 0;
775}
776static inline int pud_clear_huge(pud_t *pud)
777{
778 return 0;
779}
780static inline int pmd_clear_huge(pmd_t *pmd)
781{
782 return 0;
783}
784#endif
785
786#ifndef __HAVE_ARCH_FLUSH_PMD_TLB_RANGE
787#ifdef CONFIG_TRANSPARENT_HUGEPAGE
788
789
790
791
792
793
794
795
796
797#define flush_pmd_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
798#else
799#define flush_pmd_tlb_range(vma, addr, end) BUILD_BUG()
800#endif
801#endif
802
803#endif
804
805#ifndef io_remap_pfn_range
806#define io_remap_pfn_range remap_pfn_range
807#endif
808
809#endif
810