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Merge branch 'turbostat' of https://git.kernel.org/pub/scm/linux/kernel/git/lenb...
[deliverable/linux.git] / arch / x86 / include / asm / pgtable.h
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CommitLineData
1#ifndef _ASM_X86_PGTABLE_H
2#define _ASM_X86_PGTABLE_H
3
4#include <asm/page.h>
5#include <asm/e820.h>
6
7#include <asm/pgtable_types.h>
8
9/*
10 * Macro to mark a page protection value as UC-
11 */
12#define pgprot_noncached(prot) \
13 ((boot_cpu_data.x86 > 3) \
14 ? (__pgprot(pgprot_val(prot) | \
15 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS))) \
16 : (prot))
17
18#ifndef __ASSEMBLY__
19#include <asm/x86_init.h>
20
21void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd);
22
23/*
24 * ZERO_PAGE is a global shared page that is always zero: used
25 * for zero-mapped memory areas etc..
26 */
27extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
28 __visible;
29#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
30
31extern spinlock_t pgd_lock;
32extern struct list_head pgd_list;
33
34extern struct mm_struct *pgd_page_get_mm(struct page *page);
35
36#ifdef CONFIG_PARAVIRT
37#include <asm/paravirt.h>
38#else /* !CONFIG_PARAVIRT */
39#define set_pte(ptep, pte) native_set_pte(ptep, pte)
40#define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
41#define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
42
43#define set_pte_atomic(ptep, pte) \
44 native_set_pte_atomic(ptep, pte)
45
46#define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
47
48#ifndef __PAGETABLE_PUD_FOLDED
49#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
50#define pgd_clear(pgd) native_pgd_clear(pgd)
51#endif
52
53#ifndef set_pud
54# define set_pud(pudp, pud) native_set_pud(pudp, pud)
55#endif
56
57#ifndef __PAGETABLE_PMD_FOLDED
58#define pud_clear(pud) native_pud_clear(pud)
59#endif
60
61#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
62#define pmd_clear(pmd) native_pmd_clear(pmd)
63
64#define pte_update(mm, addr, ptep) do { } while (0)
65#define pte_update_defer(mm, addr, ptep) do { } while (0)
66#define pmd_update(mm, addr, ptep) do { } while (0)
67#define pmd_update_defer(mm, addr, ptep) do { } while (0)
68
69#define pgd_val(x) native_pgd_val(x)
70#define __pgd(x) native_make_pgd(x)
71
72#ifndef __PAGETABLE_PUD_FOLDED
73#define pud_val(x) native_pud_val(x)
74#define __pud(x) native_make_pud(x)
75#endif
76
77#ifndef __PAGETABLE_PMD_FOLDED
78#define pmd_val(x) native_pmd_val(x)
79#define __pmd(x) native_make_pmd(x)
80#endif
81
82#define pte_val(x) native_pte_val(x)
83#define __pte(x) native_make_pte(x)
84
85#define arch_end_context_switch(prev) do {} while(0)
86
87#endif /* CONFIG_PARAVIRT */
88
89/*
90 * The following only work if pte_present() is true.
91 * Undefined behaviour if not..
92 */
93static inline int pte_dirty(pte_t pte)
94{
95 return pte_flags(pte) & _PAGE_DIRTY;
96}
97
98static inline int pte_young(pte_t pte)
99{
100 return pte_flags(pte) & _PAGE_ACCESSED;
101}
102
103static inline int pmd_dirty(pmd_t pmd)
104{
105 return pmd_flags(pmd) & _PAGE_DIRTY;
106}
107
108static inline int pmd_young(pmd_t pmd)
109{
110 return pmd_flags(pmd) & _PAGE_ACCESSED;
111}
112
113static inline int pte_write(pte_t pte)
114{
115 return pte_flags(pte) & _PAGE_RW;
116}
117
118static inline int pte_huge(pte_t pte)
119{
120 return pte_flags(pte) & _PAGE_PSE;
121}
122
123static inline int pte_global(pte_t pte)
124{
125 return pte_flags(pte) & _PAGE_GLOBAL;
126}
127
128static inline int pte_exec(pte_t pte)
129{
130 return !(pte_flags(pte) & _PAGE_NX);
131}
132
133static inline int pte_special(pte_t pte)
134{
135 return pte_flags(pte) & _PAGE_SPECIAL;
136}
137
138static inline unsigned long pte_pfn(pte_t pte)
139{
140 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
141}
142
143static inline unsigned long pmd_pfn(pmd_t pmd)
144{
145 return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
146}
147
148static inline unsigned long pud_pfn(pud_t pud)
149{
150 return (pud_val(pud) & PTE_PFN_MASK) >> PAGE_SHIFT;
151}
152
153#define pte_page(pte) pfn_to_page(pte_pfn(pte))
154
155static inline int pmd_large(pmd_t pte)
156{
157 return pmd_flags(pte) & _PAGE_PSE;
158}
159
160#ifdef CONFIG_TRANSPARENT_HUGEPAGE
161static inline int pmd_trans_splitting(pmd_t pmd)
162{
163 return pmd_val(pmd) & _PAGE_SPLITTING;
164}
165
166static inline int pmd_trans_huge(pmd_t pmd)
167{
168 return pmd_val(pmd) & _PAGE_PSE;
169}
170
171static inline int has_transparent_hugepage(void)
172{
173 return cpu_has_pse;
174}
175#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
176
177static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
178{
179 pteval_t v = native_pte_val(pte);
180
181 return native_make_pte(v | set);
182}
183
184static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
185{
186 pteval_t v = native_pte_val(pte);
187
188 return native_make_pte(v & ~clear);
189}
190
191static inline pte_t pte_mkclean(pte_t pte)
192{
193 return pte_clear_flags(pte, _PAGE_DIRTY);
194}
195
196static inline pte_t pte_mkold(pte_t pte)
197{
198 return pte_clear_flags(pte, _PAGE_ACCESSED);
199}
200
201static inline pte_t pte_wrprotect(pte_t pte)
202{
203 return pte_clear_flags(pte, _PAGE_RW);
204}
205
206static inline pte_t pte_mkexec(pte_t pte)
207{
208 return pte_clear_flags(pte, _PAGE_NX);
209}
210
211static inline pte_t pte_mkdirty(pte_t pte)
212{
213 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
214}
215
216static inline pte_t pte_mkyoung(pte_t pte)
217{
218 return pte_set_flags(pte, _PAGE_ACCESSED);
219}
220
221static inline pte_t pte_mkwrite(pte_t pte)
222{
223 return pte_set_flags(pte, _PAGE_RW);
224}
225
226static inline pte_t pte_mkhuge(pte_t pte)
227{
228 return pte_set_flags(pte, _PAGE_PSE);
229}
230
231static inline pte_t pte_clrhuge(pte_t pte)
232{
233 return pte_clear_flags(pte, _PAGE_PSE);
234}
235
236static inline pte_t pte_mkglobal(pte_t pte)
237{
238 return pte_set_flags(pte, _PAGE_GLOBAL);
239}
240
241static inline pte_t pte_clrglobal(pte_t pte)
242{
243 return pte_clear_flags(pte, _PAGE_GLOBAL);
244}
245
246static inline pte_t pte_mkspecial(pte_t pte)
247{
248 return pte_set_flags(pte, _PAGE_SPECIAL);
249}
250
251static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
252{
253 pmdval_t v = native_pmd_val(pmd);
254
255 return __pmd(v | set);
256}
257
258static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
259{
260 pmdval_t v = native_pmd_val(pmd);
261
262 return __pmd(v & ~clear);
263}
264
265static inline pmd_t pmd_mkold(pmd_t pmd)
266{
267 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
268}
269
270static inline pmd_t pmd_wrprotect(pmd_t pmd)
271{
272 return pmd_clear_flags(pmd, _PAGE_RW);
273}
274
275static inline pmd_t pmd_mkdirty(pmd_t pmd)
276{
277 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
278}
279
280static inline pmd_t pmd_mkhuge(pmd_t pmd)
281{
282 return pmd_set_flags(pmd, _PAGE_PSE);
283}
284
285static inline pmd_t pmd_mkyoung(pmd_t pmd)
286{
287 return pmd_set_flags(pmd, _PAGE_ACCESSED);
288}
289
290static inline pmd_t pmd_mkwrite(pmd_t pmd)
291{
292 return pmd_set_flags(pmd, _PAGE_RW);
293}
294
295static inline pmd_t pmd_mknotpresent(pmd_t pmd)
296{
297 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
298}
299
300#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
301static inline int pte_soft_dirty(pte_t pte)
302{
303 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
304}
305
306static inline int pmd_soft_dirty(pmd_t pmd)
307{
308 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
309}
310
311static inline pte_t pte_mksoft_dirty(pte_t pte)
312{
313 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
314}
315
316static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
317{
318 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
319}
320
321#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
322
323/*
324 * Mask out unsupported bits in a present pgprot. Non-present pgprots
325 * can use those bits for other purposes, so leave them be.
326 */
327static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
328{
329 pgprotval_t protval = pgprot_val(pgprot);
330
331 if (protval & _PAGE_PRESENT)
332 protval &= __supported_pte_mask;
333
334 return protval;
335}
336
337static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
338{
339 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
340 massage_pgprot(pgprot));
341}
342
343static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
344{
345 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
346 massage_pgprot(pgprot));
347}
348
349static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
350{
351 pteval_t val = pte_val(pte);
352
353 /*
354 * Chop off the NX bit (if present), and add the NX portion of
355 * the newprot (if present):
356 */
357 val &= _PAGE_CHG_MASK;
358 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
359
360 return __pte(val);
361}
362
363static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
364{
365 pmdval_t val = pmd_val(pmd);
366
367 val &= _HPAGE_CHG_MASK;
368 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
369
370 return __pmd(val);
371}
372
373/* mprotect needs to preserve PAT bits when updating vm_page_prot */
374#define pgprot_modify pgprot_modify
375static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
376{
377 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
378 pgprotval_t addbits = pgprot_val(newprot);
379 return __pgprot(preservebits | addbits);
380}
381
382#define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
383
384#define canon_pgprot(p) __pgprot(massage_pgprot(p))
385
386static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
387 enum page_cache_mode pcm,
388 enum page_cache_mode new_pcm)
389{
390 /*
391 * PAT type is always WB for untracked ranges, so no need to check.
392 */
393 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
394 return 1;
395
396 /*
397 * Certain new memtypes are not allowed with certain
398 * requested memtype:
399 * - request is uncached, return cannot be write-back
400 * - request is write-combine, return cannot be write-back
401 * - request is write-through, return cannot be write-back
402 * - request is write-through, return cannot be write-combine
403 */
404 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
405 new_pcm == _PAGE_CACHE_MODE_WB) ||
406 (pcm == _PAGE_CACHE_MODE_WC &&
407 new_pcm == _PAGE_CACHE_MODE_WB) ||
408 (pcm == _PAGE_CACHE_MODE_WT &&
409 new_pcm == _PAGE_CACHE_MODE_WB) ||
410 (pcm == _PAGE_CACHE_MODE_WT &&
411 new_pcm == _PAGE_CACHE_MODE_WC)) {
412 return 0;
413 }
414
415 return 1;
416}
417
418pmd_t *populate_extra_pmd(unsigned long vaddr);
419pte_t *populate_extra_pte(unsigned long vaddr);
420#endif /* __ASSEMBLY__ */
421
422#ifdef CONFIG_X86_32
423# include <asm/pgtable_32.h>
424#else
425# include <asm/pgtable_64.h>
426#endif
427
428#ifndef __ASSEMBLY__
429#include <linux/mm_types.h>
430#include <linux/mmdebug.h>
431#include <linux/log2.h>
432
433static inline int pte_none(pte_t pte)
434{
435 return !pte.pte;
436}
437
438#define __HAVE_ARCH_PTE_SAME
439static inline int pte_same(pte_t a, pte_t b)
440{
441 return a.pte == b.pte;
442}
443
444static inline int pte_present(pte_t a)
445{
446 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
447}
448
449#define pte_accessible pte_accessible
450static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
451{
452 if (pte_flags(a) & _PAGE_PRESENT)
453 return true;
454
455 if ((pte_flags(a) & _PAGE_PROTNONE) &&
456 mm_tlb_flush_pending(mm))
457 return true;
458
459 return false;
460}
461
462static inline int pte_hidden(pte_t pte)
463{
464 return pte_flags(pte) & _PAGE_HIDDEN;
465}
466
467static inline int pmd_present(pmd_t pmd)
468{
469 /*
470 * Checking for _PAGE_PSE is needed too because
471 * split_huge_page will temporarily clear the present bit (but
472 * the _PAGE_PSE flag will remain set at all times while the
473 * _PAGE_PRESENT bit is clear).
474 */
475 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
476}
477
478#ifdef CONFIG_NUMA_BALANCING
479/*
480 * These work without NUMA balancing but the kernel does not care. See the
481 * comment in include/asm-generic/pgtable.h
482 */
483static inline int pte_protnone(pte_t pte)
484{
485 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
486 == _PAGE_PROTNONE;
487}
488
489static inline int pmd_protnone(pmd_t pmd)
490{
491 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
492 == _PAGE_PROTNONE;
493}
494#endif /* CONFIG_NUMA_BALANCING */
495
496static inline int pmd_none(pmd_t pmd)
497{
498 /* Only check low word on 32-bit platforms, since it might be
499 out of sync with upper half. */
500 return (unsigned long)native_pmd_val(pmd) == 0;
501}
502
503static inline unsigned long pmd_page_vaddr(pmd_t pmd)
504{
505 return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
506}
507
508/*
509 * Currently stuck as a macro due to indirect forward reference to
510 * linux/mmzone.h's __section_mem_map_addr() definition:
511 */
512#define pmd_page(pmd) pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
513
514/*
515 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
516 *
517 * this macro returns the index of the entry in the pmd page which would
518 * control the given virtual address
519 */
520static inline unsigned long pmd_index(unsigned long address)
521{
522 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
523}
524
525/*
526 * Conversion functions: convert a page and protection to a page entry,
527 * and a page entry and page directory to the page they refer to.
528 *
529 * (Currently stuck as a macro because of indirect forward reference
530 * to linux/mm.h:page_to_nid())
531 */
532#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
533
534/*
535 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
536 *
537 * this function returns the index of the entry in the pte page which would
538 * control the given virtual address
539 */
540static inline unsigned long pte_index(unsigned long address)
541{
542 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
543}
544
545static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
546{
547 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
548}
549
550static inline int pmd_bad(pmd_t pmd)
551{
552 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
553}
554
555static inline unsigned long pages_to_mb(unsigned long npg)
556{
557 return npg >> (20 - PAGE_SHIFT);
558}
559
560#if CONFIG_PGTABLE_LEVELS > 2
561static inline int pud_none(pud_t pud)
562{
563 return native_pud_val(pud) == 0;
564}
565
566static inline int pud_present(pud_t pud)
567{
568 return pud_flags(pud) & _PAGE_PRESENT;
569}
570
571static inline unsigned long pud_page_vaddr(pud_t pud)
572{
573 return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
574}
575
576/*
577 * Currently stuck as a macro due to indirect forward reference to
578 * linux/mmzone.h's __section_mem_map_addr() definition:
579 */
580#define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
581
582/* Find an entry in the second-level page table.. */
583static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
584{
585 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
586}
587
588static inline int pud_large(pud_t pud)
589{
590 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
591 (_PAGE_PSE | _PAGE_PRESENT);
592}
593
594static inline int pud_bad(pud_t pud)
595{
596 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
597}
598#else
599static inline int pud_large(pud_t pud)
600{
601 return 0;
602}
603#endif /* CONFIG_PGTABLE_LEVELS > 2 */
604
605#if CONFIG_PGTABLE_LEVELS > 3
606static inline int pgd_present(pgd_t pgd)
607{
608 return pgd_flags(pgd) & _PAGE_PRESENT;
609}
610
611static inline unsigned long pgd_page_vaddr(pgd_t pgd)
612{
613 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
614}
615
616/*
617 * Currently stuck as a macro due to indirect forward reference to
618 * linux/mmzone.h's __section_mem_map_addr() definition:
619 */
620#define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
621
622/* to find an entry in a page-table-directory. */
623static inline unsigned long pud_index(unsigned long address)
624{
625 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
626}
627
628static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
629{
630 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
631}
632
633static inline int pgd_bad(pgd_t pgd)
634{
635 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
636}
637
638static inline int pgd_none(pgd_t pgd)
639{
640 return !native_pgd_val(pgd);
641}
642#endif /* CONFIG_PGTABLE_LEVELS > 3 */
643
644#endif /* __ASSEMBLY__ */
645
646/*
647 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
648 *
649 * this macro returns the index of the entry in the pgd page which would
650 * control the given virtual address
651 */
652#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
653
654/*
655 * pgd_offset() returns a (pgd_t *)
656 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
657 */
658#define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
659/*
660 * a shortcut which implies the use of the kernel's pgd, instead
661 * of a process's
662 */
663#define pgd_offset_k(address) pgd_offset(&init_mm, (address))
664
665
666#define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
667#define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
668
669#ifndef __ASSEMBLY__
670
671extern int direct_gbpages;
672void init_mem_mapping(void);
673void early_alloc_pgt_buf(void);
674
675/* local pte updates need not use xchg for locking */
676static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
677{
678 pte_t res = *ptep;
679
680 /* Pure native function needs no input for mm, addr */
681 native_pte_clear(NULL, 0, ptep);
682 return res;
683}
684
685static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
686{
687 pmd_t res = *pmdp;
688
689 native_pmd_clear(pmdp);
690 return res;
691}
692
693static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
694 pte_t *ptep , pte_t pte)
695{
696 native_set_pte(ptep, pte);
697}
698
699static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
700 pmd_t *pmdp , pmd_t pmd)
701{
702 native_set_pmd(pmdp, pmd);
703}
704
705#ifndef CONFIG_PARAVIRT
706/*
707 * Rules for using pte_update - it must be called after any PTE update which
708 * has not been done using the set_pte / clear_pte interfaces. It is used by
709 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
710 * updates should either be sets, clears, or set_pte_atomic for P->P
711 * transitions, which means this hook should only be called for user PTEs.
712 * This hook implies a P->P protection or access change has taken place, which
713 * requires a subsequent TLB flush. The notification can optionally be delayed
714 * until the TLB flush event by using the pte_update_defer form of the
715 * interface, but care must be taken to assure that the flush happens while
716 * still holding the same page table lock so that the shadow and primary pages
717 * do not become out of sync on SMP.
718 */
719#define pte_update(mm, addr, ptep) do { } while (0)
720#define pte_update_defer(mm, addr, ptep) do { } while (0)
721#endif
722
723/*
724 * We only update the dirty/accessed state if we set
725 * the dirty bit by hand in the kernel, since the hardware
726 * will do the accessed bit for us, and we don't want to
727 * race with other CPU's that might be updating the dirty
728 * bit at the same time.
729 */
730struct vm_area_struct;
731
732#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
733extern int ptep_set_access_flags(struct vm_area_struct *vma,
734 unsigned long address, pte_t *ptep,
735 pte_t entry, int dirty);
736
737#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
738extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
739 unsigned long addr, pte_t *ptep);
740
741#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
742extern int ptep_clear_flush_young(struct vm_area_struct *vma,
743 unsigned long address, pte_t *ptep);
744
745#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
746static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
747 pte_t *ptep)
748{
749 pte_t pte = native_ptep_get_and_clear(ptep);
750 pte_update(mm, addr, ptep);
751 return pte;
752}
753
754#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
755static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
756 unsigned long addr, pte_t *ptep,
757 int full)
758{
759 pte_t pte;
760 if (full) {
761 /*
762 * Full address destruction in progress; paravirt does not
763 * care about updates and native needs no locking
764 */
765 pte = native_local_ptep_get_and_clear(ptep);
766 } else {
767 pte = ptep_get_and_clear(mm, addr, ptep);
768 }
769 return pte;
770}
771
772#define __HAVE_ARCH_PTEP_SET_WRPROTECT
773static inline void ptep_set_wrprotect(struct mm_struct *mm,
774 unsigned long addr, pte_t *ptep)
775{
776 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
777 pte_update(mm, addr, ptep);
778}
779
780#define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
781
782#define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
783
784#define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
785extern int pmdp_set_access_flags(struct vm_area_struct *vma,
786 unsigned long address, pmd_t *pmdp,
787 pmd_t entry, int dirty);
788
789#define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
790extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
791 unsigned long addr, pmd_t *pmdp);
792
793#define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
794extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
795 unsigned long address, pmd_t *pmdp);
796
797
798#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
799extern void pmdp_splitting_flush(struct vm_area_struct *vma,
800 unsigned long addr, pmd_t *pmdp);
801
802#define __HAVE_ARCH_PMD_WRITE
803static inline int pmd_write(pmd_t pmd)
804{
805 return pmd_flags(pmd) & _PAGE_RW;
806}
807
808#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
809static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
810 pmd_t *pmdp)
811{
812 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
813 pmd_update(mm, addr, pmdp);
814 return pmd;
815}
816
817#define __HAVE_ARCH_PMDP_SET_WRPROTECT
818static inline void pmdp_set_wrprotect(struct mm_struct *mm,
819 unsigned long addr, pmd_t *pmdp)
820{
821 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
822 pmd_update(mm, addr, pmdp);
823}
824
825/*
826 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
827 *
828 * dst - pointer to pgd range anwhere on a pgd page
829 * src - ""
830 * count - the number of pgds to copy.
831 *
832 * dst and src can be on the same page, but the range must not overlap,
833 * and must not cross a page boundary.
834 */
835static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
836{
837 memcpy(dst, src, count * sizeof(pgd_t));
838}
839
840#define PTE_SHIFT ilog2(PTRS_PER_PTE)
841static inline int page_level_shift(enum pg_level level)
842{
843 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
844}
845static inline unsigned long page_level_size(enum pg_level level)
846{
847 return 1UL << page_level_shift(level);
848}
849static inline unsigned long page_level_mask(enum pg_level level)
850{
851 return ~(page_level_size(level) - 1);
852}
853
854/*
855 * The x86 doesn't have any external MMU info: the kernel page
856 * tables contain all the necessary information.
857 */
858static inline void update_mmu_cache(struct vm_area_struct *vma,
859 unsigned long addr, pte_t *ptep)
860{
861}
862static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
863 unsigned long addr, pmd_t *pmd)
864{
865}
866
867#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
868static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
869{
870 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
871}
872
873static inline int pte_swp_soft_dirty(pte_t pte)
874{
875 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
876}
877
878static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
879{
880 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
881}
882#endif
883
884#include <asm-generic/pgtable.h>
885#endif /* __ASSEMBLY__ */
886
887#endif /* _ASM_X86_PGTABLE_H */
Linux kernel - Deliverables
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