xref: /openbmc/linux/arch/x86/include/asm/pgtable.h (revision 6774def6)
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) | _PAGE_CACHE_UC_MINUS))	\
15 	 : (prot))
16 
17 #ifndef __ASSEMBLY__
18 #include <asm/x86_init.h>
19 
20 void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd);
21 
22 /*
23  * ZERO_PAGE is a global shared page that is always zero: used
24  * for zero-mapped memory areas etc..
25  */
26 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
27 	__visible;
28 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
29 
30 extern spinlock_t pgd_lock;
31 extern struct list_head pgd_list;
32 
33 extern struct mm_struct *pgd_page_get_mm(struct page *page);
34 
35 #ifdef CONFIG_PARAVIRT
36 #include <asm/paravirt.h>
37 #else  /* !CONFIG_PARAVIRT */
38 #define set_pte(ptep, pte)		native_set_pte(ptep, pte)
39 #define set_pte_at(mm, addr, ptep, pte)	native_set_pte_at(mm, addr, ptep, pte)
40 #define set_pmd_at(mm, addr, pmdp, pmd)	native_set_pmd_at(mm, addr, pmdp, pmd)
41 
42 #define set_pte_atomic(ptep, pte)					\
43 	native_set_pte_atomic(ptep, pte)
44 
45 #define set_pmd(pmdp, pmd)		native_set_pmd(pmdp, pmd)
46 
47 #ifndef __PAGETABLE_PUD_FOLDED
48 #define set_pgd(pgdp, pgd)		native_set_pgd(pgdp, pgd)
49 #define pgd_clear(pgd)			native_pgd_clear(pgd)
50 #endif
51 
52 #ifndef set_pud
53 # define set_pud(pudp, pud)		native_set_pud(pudp, pud)
54 #endif
55 
56 #ifndef __PAGETABLE_PMD_FOLDED
57 #define pud_clear(pud)			native_pud_clear(pud)
58 #endif
59 
60 #define pte_clear(mm, addr, ptep)	native_pte_clear(mm, addr, ptep)
61 #define pmd_clear(pmd)			native_pmd_clear(pmd)
62 
63 #define pte_update(mm, addr, ptep)              do { } while (0)
64 #define pte_update_defer(mm, addr, ptep)        do { } while (0)
65 #define pmd_update(mm, addr, ptep)              do { } while (0)
66 #define pmd_update_defer(mm, addr, ptep)        do { } while (0)
67 
68 #define pgd_val(x)	native_pgd_val(x)
69 #define __pgd(x)	native_make_pgd(x)
70 
71 #ifndef __PAGETABLE_PUD_FOLDED
72 #define pud_val(x)	native_pud_val(x)
73 #define __pud(x)	native_make_pud(x)
74 #endif
75 
76 #ifndef __PAGETABLE_PMD_FOLDED
77 #define pmd_val(x)	native_pmd_val(x)
78 #define __pmd(x)	native_make_pmd(x)
79 #endif
80 
81 #define pte_val(x)	native_pte_val(x)
82 #define __pte(x)	native_make_pte(x)
83 
84 #define arch_end_context_switch(prev)	do {} while(0)
85 
86 #endif	/* CONFIG_PARAVIRT */
87 
88 /*
89  * The following only work if pte_present() is true.
90  * Undefined behaviour if not..
91  */
92 static inline int pte_dirty(pte_t pte)
93 {
94 	return pte_flags(pte) & _PAGE_DIRTY;
95 }
96 
97 static inline int pte_young(pte_t pte)
98 {
99 	return pte_flags(pte) & _PAGE_ACCESSED;
100 }
101 
102 static inline int pmd_young(pmd_t pmd)
103 {
104 	return pmd_flags(pmd) & _PAGE_ACCESSED;
105 }
106 
107 static inline int pte_write(pte_t pte)
108 {
109 	return pte_flags(pte) & _PAGE_RW;
110 }
111 
112 static inline int pte_file(pte_t pte)
113 {
114 	return pte_flags(pte) & _PAGE_FILE;
115 }
116 
117 static inline int pte_huge(pte_t pte)
118 {
119 	return pte_flags(pte) & _PAGE_PSE;
120 }
121 
122 static inline int pte_global(pte_t pte)
123 {
124 	return pte_flags(pte) & _PAGE_GLOBAL;
125 }
126 
127 static inline int pte_exec(pte_t pte)
128 {
129 	return !(pte_flags(pte) & _PAGE_NX);
130 }
131 
132 static inline int pte_special(pte_t pte)
133 {
134 	/*
135 	 * See CONFIG_NUMA_BALANCING pte_numa in include/asm-generic/pgtable.h.
136 	 * On x86 we have _PAGE_BIT_NUMA == _PAGE_BIT_GLOBAL+1 ==
137 	 * __PAGE_BIT_SOFTW1 == _PAGE_BIT_SPECIAL.
138 	 */
139 	return (pte_flags(pte) & _PAGE_SPECIAL) &&
140 		(pte_flags(pte) & (_PAGE_PRESENT|_PAGE_PROTNONE));
141 }
142 
143 static inline unsigned long pte_pfn(pte_t pte)
144 {
145 	return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
146 }
147 
148 static inline unsigned long pmd_pfn(pmd_t pmd)
149 {
150 	return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
151 }
152 
153 static inline unsigned long pud_pfn(pud_t pud)
154 {
155 	return (pud_val(pud) & PTE_PFN_MASK) >> PAGE_SHIFT;
156 }
157 
158 #define pte_page(pte)	pfn_to_page(pte_pfn(pte))
159 
160 static inline int pmd_large(pmd_t pte)
161 {
162 	return pmd_flags(pte) & _PAGE_PSE;
163 }
164 
165 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
166 static inline int pmd_trans_splitting(pmd_t pmd)
167 {
168 	return pmd_val(pmd) & _PAGE_SPLITTING;
169 }
170 
171 static inline int pmd_trans_huge(pmd_t pmd)
172 {
173 	return pmd_val(pmd) & _PAGE_PSE;
174 }
175 
176 static inline int has_transparent_hugepage(void)
177 {
178 	return cpu_has_pse;
179 }
180 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
181 
182 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
183 {
184 	pteval_t v = native_pte_val(pte);
185 
186 	return native_make_pte(v | set);
187 }
188 
189 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
190 {
191 	pteval_t v = native_pte_val(pte);
192 
193 	return native_make_pte(v & ~clear);
194 }
195 
196 static inline pte_t pte_mkclean(pte_t pte)
197 {
198 	return pte_clear_flags(pte, _PAGE_DIRTY);
199 }
200 
201 static inline pte_t pte_mkold(pte_t pte)
202 {
203 	return pte_clear_flags(pte, _PAGE_ACCESSED);
204 }
205 
206 static inline pte_t pte_wrprotect(pte_t pte)
207 {
208 	return pte_clear_flags(pte, _PAGE_RW);
209 }
210 
211 static inline pte_t pte_mkexec(pte_t pte)
212 {
213 	return pte_clear_flags(pte, _PAGE_NX);
214 }
215 
216 static inline pte_t pte_mkdirty(pte_t pte)
217 {
218 	return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
219 }
220 
221 static inline pte_t pte_mkyoung(pte_t pte)
222 {
223 	return pte_set_flags(pte, _PAGE_ACCESSED);
224 }
225 
226 static inline pte_t pte_mkwrite(pte_t pte)
227 {
228 	return pte_set_flags(pte, _PAGE_RW);
229 }
230 
231 static inline pte_t pte_mkhuge(pte_t pte)
232 {
233 	return pte_set_flags(pte, _PAGE_PSE);
234 }
235 
236 static inline pte_t pte_clrhuge(pte_t pte)
237 {
238 	return pte_clear_flags(pte, _PAGE_PSE);
239 }
240 
241 static inline pte_t pte_mkglobal(pte_t pte)
242 {
243 	return pte_set_flags(pte, _PAGE_GLOBAL);
244 }
245 
246 static inline pte_t pte_clrglobal(pte_t pte)
247 {
248 	return pte_clear_flags(pte, _PAGE_GLOBAL);
249 }
250 
251 static inline pte_t pte_mkspecial(pte_t pte)
252 {
253 	return pte_set_flags(pte, _PAGE_SPECIAL);
254 }
255 
256 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
257 {
258 	pmdval_t v = native_pmd_val(pmd);
259 
260 	return __pmd(v | set);
261 }
262 
263 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
264 {
265 	pmdval_t v = native_pmd_val(pmd);
266 
267 	return __pmd(v & ~clear);
268 }
269 
270 static inline pmd_t pmd_mkold(pmd_t pmd)
271 {
272 	return pmd_clear_flags(pmd, _PAGE_ACCESSED);
273 }
274 
275 static inline pmd_t pmd_wrprotect(pmd_t pmd)
276 {
277 	return pmd_clear_flags(pmd, _PAGE_RW);
278 }
279 
280 static inline pmd_t pmd_mkdirty(pmd_t pmd)
281 {
282 	return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
283 }
284 
285 static inline pmd_t pmd_mkhuge(pmd_t pmd)
286 {
287 	return pmd_set_flags(pmd, _PAGE_PSE);
288 }
289 
290 static inline pmd_t pmd_mkyoung(pmd_t pmd)
291 {
292 	return pmd_set_flags(pmd, _PAGE_ACCESSED);
293 }
294 
295 static inline pmd_t pmd_mkwrite(pmd_t pmd)
296 {
297 	return pmd_set_flags(pmd, _PAGE_RW);
298 }
299 
300 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
301 {
302 	return pmd_clear_flags(pmd, _PAGE_PRESENT);
303 }
304 
305 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
306 static inline int pte_soft_dirty(pte_t pte)
307 {
308 	return pte_flags(pte) & _PAGE_SOFT_DIRTY;
309 }
310 
311 static inline int pmd_soft_dirty(pmd_t pmd)
312 {
313 	return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
314 }
315 
316 static inline pte_t pte_mksoft_dirty(pte_t pte)
317 {
318 	return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
319 }
320 
321 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
322 {
323 	return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
324 }
325 
326 static inline pte_t pte_file_clear_soft_dirty(pte_t pte)
327 {
328 	return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
329 }
330 
331 static inline pte_t pte_file_mksoft_dirty(pte_t pte)
332 {
333 	return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
334 }
335 
336 static inline int pte_file_soft_dirty(pte_t pte)
337 {
338 	return pte_flags(pte) & _PAGE_SOFT_DIRTY;
339 }
340 
341 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
342 
343 /*
344  * Mask out unsupported bits in a present pgprot.  Non-present pgprots
345  * can use those bits for other purposes, so leave them be.
346  */
347 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
348 {
349 	pgprotval_t protval = pgprot_val(pgprot);
350 
351 	if (protval & _PAGE_PRESENT)
352 		protval &= __supported_pte_mask;
353 
354 	return protval;
355 }
356 
357 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
358 {
359 	return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
360 		     massage_pgprot(pgprot));
361 }
362 
363 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
364 {
365 	return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
366 		     massage_pgprot(pgprot));
367 }
368 
369 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
370 {
371 	pteval_t val = pte_val(pte);
372 
373 	/*
374 	 * Chop off the NX bit (if present), and add the NX portion of
375 	 * the newprot (if present):
376 	 */
377 	val &= _PAGE_CHG_MASK;
378 	val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
379 
380 	return __pte(val);
381 }
382 
383 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
384 {
385 	pmdval_t val = pmd_val(pmd);
386 
387 	val &= _HPAGE_CHG_MASK;
388 	val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
389 
390 	return __pmd(val);
391 }
392 
393 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
394 #define pgprot_modify pgprot_modify
395 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
396 {
397 	pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
398 	pgprotval_t addbits = pgprot_val(newprot);
399 	return __pgprot(preservebits | addbits);
400 }
401 
402 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
403 
404 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
405 
406 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
407 					 unsigned long flags,
408 					 unsigned long new_flags)
409 {
410 	/*
411 	 * PAT type is always WB for untracked ranges, so no need to check.
412 	 */
413 	if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
414 		return 1;
415 
416 	/*
417 	 * Certain new memtypes are not allowed with certain
418 	 * requested memtype:
419 	 * - request is uncached, return cannot be write-back
420 	 * - request is write-combine, return cannot be write-back
421 	 */
422 	if ((flags == _PAGE_CACHE_UC_MINUS &&
423 	     new_flags == _PAGE_CACHE_WB) ||
424 	    (flags == _PAGE_CACHE_WC &&
425 	     new_flags == _PAGE_CACHE_WB)) {
426 		return 0;
427 	}
428 
429 	return 1;
430 }
431 
432 pmd_t *populate_extra_pmd(unsigned long vaddr);
433 pte_t *populate_extra_pte(unsigned long vaddr);
434 #endif	/* __ASSEMBLY__ */
435 
436 #ifdef CONFIG_X86_32
437 # include <asm/pgtable_32.h>
438 #else
439 # include <asm/pgtable_64.h>
440 #endif
441 
442 #ifndef __ASSEMBLY__
443 #include <linux/mm_types.h>
444 #include <linux/mmdebug.h>
445 #include <linux/log2.h>
446 
447 static inline int pte_none(pte_t pte)
448 {
449 	return !pte.pte;
450 }
451 
452 #define __HAVE_ARCH_PTE_SAME
453 static inline int pte_same(pte_t a, pte_t b)
454 {
455 	return a.pte == b.pte;
456 }
457 
458 static inline int pte_present(pte_t a)
459 {
460 	return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE |
461 			       _PAGE_NUMA);
462 }
463 
464 #define pte_present_nonuma pte_present_nonuma
465 static inline int pte_present_nonuma(pte_t a)
466 {
467 	return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
468 }
469 
470 #define pte_accessible pte_accessible
471 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
472 {
473 	if (pte_flags(a) & _PAGE_PRESENT)
474 		return true;
475 
476 	if ((pte_flags(a) & (_PAGE_PROTNONE | _PAGE_NUMA)) &&
477 			mm_tlb_flush_pending(mm))
478 		return true;
479 
480 	return false;
481 }
482 
483 static inline int pte_hidden(pte_t pte)
484 {
485 	return pte_flags(pte) & _PAGE_HIDDEN;
486 }
487 
488 static inline int pmd_present(pmd_t pmd)
489 {
490 	/*
491 	 * Checking for _PAGE_PSE is needed too because
492 	 * split_huge_page will temporarily clear the present bit (but
493 	 * the _PAGE_PSE flag will remain set at all times while the
494 	 * _PAGE_PRESENT bit is clear).
495 	 */
496 	return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE |
497 				 _PAGE_NUMA);
498 }
499 
500 static inline int pmd_none(pmd_t pmd)
501 {
502 	/* Only check low word on 32-bit platforms, since it might be
503 	   out of sync with upper half. */
504 	return (unsigned long)native_pmd_val(pmd) == 0;
505 }
506 
507 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
508 {
509 	return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
510 }
511 
512 /*
513  * Currently stuck as a macro due to indirect forward reference to
514  * linux/mmzone.h's __section_mem_map_addr() definition:
515  */
516 #define pmd_page(pmd)	pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
517 
518 /*
519  * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
520  *
521  * this macro returns the index of the entry in the pmd page which would
522  * control the given virtual address
523  */
524 static inline unsigned long pmd_index(unsigned long address)
525 {
526 	return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
527 }
528 
529 /*
530  * Conversion functions: convert a page and protection to a page entry,
531  * and a page entry and page directory to the page they refer to.
532  *
533  * (Currently stuck as a macro because of indirect forward reference
534  * to linux/mm.h:page_to_nid())
535  */
536 #define mk_pte(page, pgprot)   pfn_pte(page_to_pfn(page), (pgprot))
537 
538 /*
539  * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
540  *
541  * this function returns the index of the entry in the pte page which would
542  * control the given virtual address
543  */
544 static inline unsigned long pte_index(unsigned long address)
545 {
546 	return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
547 }
548 
549 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
550 {
551 	return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
552 }
553 
554 static inline int pmd_bad(pmd_t pmd)
555 {
556 #ifdef CONFIG_NUMA_BALANCING
557 	/* pmd_numa check */
558 	if ((pmd_flags(pmd) & (_PAGE_NUMA|_PAGE_PRESENT)) == _PAGE_NUMA)
559 		return 0;
560 #endif
561 	return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
562 }
563 
564 static inline unsigned long pages_to_mb(unsigned long npg)
565 {
566 	return npg >> (20 - PAGE_SHIFT);
567 }
568 
569 #if PAGETABLE_LEVELS > 2
570 static inline int pud_none(pud_t pud)
571 {
572 	return native_pud_val(pud) == 0;
573 }
574 
575 static inline int pud_present(pud_t pud)
576 {
577 	return pud_flags(pud) & _PAGE_PRESENT;
578 }
579 
580 static inline unsigned long pud_page_vaddr(pud_t pud)
581 {
582 	return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
583 }
584 
585 /*
586  * Currently stuck as a macro due to indirect forward reference to
587  * linux/mmzone.h's __section_mem_map_addr() definition:
588  */
589 #define pud_page(pud)		pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
590 
591 /* Find an entry in the second-level page table.. */
592 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
593 {
594 	return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
595 }
596 
597 static inline int pud_large(pud_t pud)
598 {
599 	return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
600 		(_PAGE_PSE | _PAGE_PRESENT);
601 }
602 
603 static inline int pud_bad(pud_t pud)
604 {
605 	return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
606 }
607 #else
608 static inline int pud_large(pud_t pud)
609 {
610 	return 0;
611 }
612 #endif	/* PAGETABLE_LEVELS > 2 */
613 
614 #if PAGETABLE_LEVELS > 3
615 static inline int pgd_present(pgd_t pgd)
616 {
617 	return pgd_flags(pgd) & _PAGE_PRESENT;
618 }
619 
620 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
621 {
622 	return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
623 }
624 
625 /*
626  * Currently stuck as a macro due to indirect forward reference to
627  * linux/mmzone.h's __section_mem_map_addr() definition:
628  */
629 #define pgd_page(pgd)		pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
630 
631 /* to find an entry in a page-table-directory. */
632 static inline unsigned long pud_index(unsigned long address)
633 {
634 	return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
635 }
636 
637 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
638 {
639 	return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
640 }
641 
642 static inline int pgd_bad(pgd_t pgd)
643 {
644 	return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
645 }
646 
647 static inline int pgd_none(pgd_t pgd)
648 {
649 	return !native_pgd_val(pgd);
650 }
651 #endif	/* PAGETABLE_LEVELS > 3 */
652 
653 #endif	/* __ASSEMBLY__ */
654 
655 /*
656  * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
657  *
658  * this macro returns the index of the entry in the pgd page which would
659  * control the given virtual address
660  */
661 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
662 
663 /*
664  * pgd_offset() returns a (pgd_t *)
665  * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
666  */
667 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
668 /*
669  * a shortcut which implies the use of the kernel's pgd, instead
670  * of a process's
671  */
672 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
673 
674 
675 #define KERNEL_PGD_BOUNDARY	pgd_index(PAGE_OFFSET)
676 #define KERNEL_PGD_PTRS		(PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
677 
678 #ifndef __ASSEMBLY__
679 
680 extern int direct_gbpages;
681 void init_mem_mapping(void);
682 void early_alloc_pgt_buf(void);
683 
684 /* local pte updates need not use xchg for locking */
685 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
686 {
687 	pte_t res = *ptep;
688 
689 	/* Pure native function needs no input for mm, addr */
690 	native_pte_clear(NULL, 0, ptep);
691 	return res;
692 }
693 
694 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
695 {
696 	pmd_t res = *pmdp;
697 
698 	native_pmd_clear(pmdp);
699 	return res;
700 }
701 
702 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
703 				     pte_t *ptep , pte_t pte)
704 {
705 	native_set_pte(ptep, pte);
706 }
707 
708 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
709 				     pmd_t *pmdp , pmd_t pmd)
710 {
711 	native_set_pmd(pmdp, pmd);
712 }
713 
714 #ifndef CONFIG_PARAVIRT
715 /*
716  * Rules for using pte_update - it must be called after any PTE update which
717  * has not been done using the set_pte / clear_pte interfaces.  It is used by
718  * shadow mode hypervisors to resynchronize the shadow page tables.  Kernel PTE
719  * updates should either be sets, clears, or set_pte_atomic for P->P
720  * transitions, which means this hook should only be called for user PTEs.
721  * This hook implies a P->P protection or access change has taken place, which
722  * requires a subsequent TLB flush.  The notification can optionally be delayed
723  * until the TLB flush event by using the pte_update_defer form of the
724  * interface, but care must be taken to assure that the flush happens while
725  * still holding the same page table lock so that the shadow and primary pages
726  * do not become out of sync on SMP.
727  */
728 #define pte_update(mm, addr, ptep)		do { } while (0)
729 #define pte_update_defer(mm, addr, ptep)	do { } while (0)
730 #endif
731 
732 /*
733  * We only update the dirty/accessed state if we set
734  * the dirty bit by hand in the kernel, since the hardware
735  * will do the accessed bit for us, and we don't want to
736  * race with other CPU's that might be updating the dirty
737  * bit at the same time.
738  */
739 struct vm_area_struct;
740 
741 #define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
742 extern int ptep_set_access_flags(struct vm_area_struct *vma,
743 				 unsigned long address, pte_t *ptep,
744 				 pte_t entry, int dirty);
745 
746 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
747 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
748 				     unsigned long addr, pte_t *ptep);
749 
750 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
751 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
752 				  unsigned long address, pte_t *ptep);
753 
754 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
755 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
756 				       pte_t *ptep)
757 {
758 	pte_t pte = native_ptep_get_and_clear(ptep);
759 	pte_update(mm, addr, ptep);
760 	return pte;
761 }
762 
763 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
764 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
765 					    unsigned long addr, pte_t *ptep,
766 					    int full)
767 {
768 	pte_t pte;
769 	if (full) {
770 		/*
771 		 * Full address destruction in progress; paravirt does not
772 		 * care about updates and native needs no locking
773 		 */
774 		pte = native_local_ptep_get_and_clear(ptep);
775 	} else {
776 		pte = ptep_get_and_clear(mm, addr, ptep);
777 	}
778 	return pte;
779 }
780 
781 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
782 static inline void ptep_set_wrprotect(struct mm_struct *mm,
783 				      unsigned long addr, pte_t *ptep)
784 {
785 	clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
786 	pte_update(mm, addr, ptep);
787 }
788 
789 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
790 
791 #define mk_pmd(page, pgprot)   pfn_pmd(page_to_pfn(page), (pgprot))
792 
793 #define  __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
794 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
795 				 unsigned long address, pmd_t *pmdp,
796 				 pmd_t entry, int dirty);
797 
798 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
799 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
800 				     unsigned long addr, pmd_t *pmdp);
801 
802 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
803 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
804 				  unsigned long address, pmd_t *pmdp);
805 
806 
807 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
808 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
809 				 unsigned long addr, pmd_t *pmdp);
810 
811 #define __HAVE_ARCH_PMD_WRITE
812 static inline int pmd_write(pmd_t pmd)
813 {
814 	return pmd_flags(pmd) & _PAGE_RW;
815 }
816 
817 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
818 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
819 				       pmd_t *pmdp)
820 {
821 	pmd_t pmd = native_pmdp_get_and_clear(pmdp);
822 	pmd_update(mm, addr, pmdp);
823 	return pmd;
824 }
825 
826 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
827 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
828 				      unsigned long addr, pmd_t *pmdp)
829 {
830 	clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
831 	pmd_update(mm, addr, pmdp);
832 }
833 
834 /*
835  * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
836  *
837  *  dst - pointer to pgd range anwhere on a pgd page
838  *  src - ""
839  *  count - the number of pgds to copy.
840  *
841  * dst and src can be on the same page, but the range must not overlap,
842  * and must not cross a page boundary.
843  */
844 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
845 {
846        memcpy(dst, src, count * sizeof(pgd_t));
847 }
848 
849 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
850 static inline int page_level_shift(enum pg_level level)
851 {
852 	return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
853 }
854 static inline unsigned long page_level_size(enum pg_level level)
855 {
856 	return 1UL << page_level_shift(level);
857 }
858 static inline unsigned long page_level_mask(enum pg_level level)
859 {
860 	return ~(page_level_size(level) - 1);
861 }
862 
863 /*
864  * The x86 doesn't have any external MMU info: the kernel page
865  * tables contain all the necessary information.
866  */
867 static inline void update_mmu_cache(struct vm_area_struct *vma,
868 		unsigned long addr, pte_t *ptep)
869 {
870 }
871 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
872 		unsigned long addr, pmd_t *pmd)
873 {
874 }
875 
876 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
877 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
878 {
879 	VM_BUG_ON(pte_present_nonuma(pte));
880 	return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
881 }
882 
883 static inline int pte_swp_soft_dirty(pte_t pte)
884 {
885 	VM_BUG_ON(pte_present_nonuma(pte));
886 	return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
887 }
888 
889 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
890 {
891 	VM_BUG_ON(pte_present_nonuma(pte));
892 	return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
893 }
894 #endif
895 
896 #include <asm-generic/pgtable.h>
897 #endif	/* __ASSEMBLY__ */
898 
899 #endif /* _ASM_X86_PGTABLE_H */
900