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
19 /*
20 * ZERO_PAGE is a global shared page that is always zero: used
21 * for zero-mapped memory areas etc..
22 */
23 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
24 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
25
26 extern spinlock_t pgd_lock;
27 extern struct list_head pgd_list;
28
29 #ifdef CONFIG_PARAVIRT
30 #include <asm/paravirt.h>
31 #else /* !CONFIG_PARAVIRT */
32 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
33 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
34
35 #define set_pte_atomic(ptep, pte) \
36 native_set_pte_atomic(ptep, pte)
37
38 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
39
40 #ifndef __PAGETABLE_PUD_FOLDED
41 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
42 #define pgd_clear(pgd) native_pgd_clear(pgd)
43 #endif
44
45 #ifndef set_pud
46 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
47 #endif
48
49 #ifndef __PAGETABLE_PMD_FOLDED
50 #define pud_clear(pud) native_pud_clear(pud)
51 #endif
52
53 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
54 #define pmd_clear(pmd) native_pmd_clear(pmd)
55
56 #define pte_update(mm, addr, ptep) do { } while (0)
57 #define pte_update_defer(mm, addr, ptep) do { } while (0)
58
59 static inline void __init paravirt_pagetable_setup_start(pgd_t *base)
60 {
61 native_pagetable_setup_start(base);
62 }
63
64 static inline void __init paravirt_pagetable_setup_done(pgd_t *base)
65 {
66 native_pagetable_setup_done(base);
67 }
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 */
93 static inline int pte_dirty(pte_t pte)
94 {
95 return pte_flags(pte) & _PAGE_DIRTY;
96 }
97
98 static inline int pte_young(pte_t pte)
99 {
100 return pte_flags(pte) & _PAGE_ACCESSED;
101 }
102
103 static inline int pte_write(pte_t pte)
104 {
105 return pte_flags(pte) & _PAGE_RW;
106 }
107
108 static inline int pte_file(pte_t pte)
109 {
110 return pte_flags(pte) & _PAGE_FILE;
111 }
112
113 static inline int pte_huge(pte_t pte)
114 {
115 return pte_flags(pte) & _PAGE_PSE;
116 }
117
118 static inline int pte_global(pte_t pte)
119 {
120 return pte_flags(pte) & _PAGE_GLOBAL;
121 }
122
123 static inline int pte_exec(pte_t pte)
124 {
125 return !(pte_flags(pte) & _PAGE_NX);
126 }
127
128 static inline int pte_special(pte_t pte)
129 {
130 return pte_flags(pte) & _PAGE_SPECIAL;
131 }
132
133 static inline unsigned long pte_pfn(pte_t pte)
134 {
135 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
136 }
137
138 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
139
140 static inline int pmd_large(pmd_t pte)
141 {
142 return (pmd_flags(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
143 (_PAGE_PSE | _PAGE_PRESENT);
144 }
145
146 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
147 {
148 pteval_t v = native_pte_val(pte);
149
150 return native_make_pte(v | set);
151 }
152
153 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
154 {
155 pteval_t v = native_pte_val(pte);
156
157 return native_make_pte(v & ~clear);
158 }
159
160 static inline pte_t pte_mkclean(pte_t pte)
161 {
162 return pte_clear_flags(pte, _PAGE_DIRTY);
163 }
164
165 static inline pte_t pte_mkold(pte_t pte)
166 {
167 return pte_clear_flags(pte, _PAGE_ACCESSED);
168 }
169
170 static inline pte_t pte_wrprotect(pte_t pte)
171 {
172 return pte_clear_flags(pte, _PAGE_RW);
173 }
174
175 static inline pte_t pte_mkexec(pte_t pte)
176 {
177 return pte_clear_flags(pte, _PAGE_NX);
178 }
179
180 static inline pte_t pte_mkdirty(pte_t pte)
181 {
182 return pte_set_flags(pte, _PAGE_DIRTY);
183 }
184
185 static inline pte_t pte_mkyoung(pte_t pte)
186 {
187 return pte_set_flags(pte, _PAGE_ACCESSED);
188 }
189
190 static inline pte_t pte_mkwrite(pte_t pte)
191 {
192 return pte_set_flags(pte, _PAGE_RW);
193 }
194
195 static inline pte_t pte_mkhuge(pte_t pte)
196 {
197 return pte_set_flags(pte, _PAGE_PSE);
198 }
199
200 static inline pte_t pte_clrhuge(pte_t pte)
201 {
202 return pte_clear_flags(pte, _PAGE_PSE);
203 }
204
205 static inline pte_t pte_mkglobal(pte_t pte)
206 {
207 return pte_set_flags(pte, _PAGE_GLOBAL);
208 }
209
210 static inline pte_t pte_clrglobal(pte_t pte)
211 {
212 return pte_clear_flags(pte, _PAGE_GLOBAL);
213 }
214
215 static inline pte_t pte_mkspecial(pte_t pte)
216 {
217 return pte_set_flags(pte, _PAGE_SPECIAL);
218 }
219
220 /*
221 * Mask out unsupported bits in a present pgprot. Non-present pgprots
222 * can use those bits for other purposes, so leave them be.
223 */
224 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
225 {
226 pgprotval_t protval = pgprot_val(pgprot);
227
228 if (protval & _PAGE_PRESENT)
229 protval &= __supported_pte_mask;
230
231 return protval;
232 }
233
234 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
235 {
236 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
237 massage_pgprot(pgprot));
238 }
239
240 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
241 {
242 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
243 massage_pgprot(pgprot));
244 }
245
246 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
247 {
248 pteval_t val = pte_val(pte);
249
250 /*
251 * Chop off the NX bit (if present), and add the NX portion of
252 * the newprot (if present):
253 */
254 val &= _PAGE_CHG_MASK;
255 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
256
257 return __pte(val);
258 }
259
260 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
261 #define pgprot_modify pgprot_modify
262 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
263 {
264 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
265 pgprotval_t addbits = pgprot_val(newprot);
266 return __pgprot(preservebits | addbits);
267 }
268
269 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
270
271 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
272
273 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
274 unsigned long flags,
275 unsigned long new_flags)
276 {
277 /*
278 * PAT type is always WB for ISA. So no need to check.
279 */
280 if (is_ISA_range(paddr, paddr + size - 1))
281 return 1;
282
283 /*
284 * Certain new memtypes are not allowed with certain
285 * requested memtype:
286 * - request is uncached, return cannot be write-back
287 * - request is write-combine, return cannot be write-back
288 */
289 if ((flags == _PAGE_CACHE_UC_MINUS &&
290 new_flags == _PAGE_CACHE_WB) ||
291 (flags == _PAGE_CACHE_WC &&
292 new_flags == _PAGE_CACHE_WB)) {
293 return 0;
294 }
295
296 return 1;
297 }
298
299 pmd_t *populate_extra_pmd(unsigned long vaddr);
300 pte_t *populate_extra_pte(unsigned long vaddr);
301 #endif /* __ASSEMBLY__ */
302
303 #ifdef CONFIG_X86_32
304 # include "pgtable_32.h"
305 #else
306 # include "pgtable_64.h"
307 #endif
308
309 #ifndef __ASSEMBLY__
310 #include <linux/mm_types.h>
311
312 static inline int pte_none(pte_t pte)
313 {
314 return !pte.pte;
315 }
316
317 #define __HAVE_ARCH_PTE_SAME
318 static inline int pte_same(pte_t a, pte_t b)
319 {
320 return a.pte == b.pte;
321 }
322
323 static inline int pte_present(pte_t a)
324 {
325 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
326 }
327
328 static inline int pte_hidden(pte_t pte)
329 {
330 return pte_flags(pte) & _PAGE_HIDDEN;
331 }
332
333 static inline int pmd_present(pmd_t pmd)
334 {
335 return pmd_flags(pmd) & _PAGE_PRESENT;
336 }
337
338 static inline int pmd_none(pmd_t pmd)
339 {
340 /* Only check low word on 32-bit platforms, since it might be
341 out of sync with upper half. */
342 return (unsigned long)native_pmd_val(pmd) == 0;
343 }
344
345 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
346 {
347 return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
348 }
349
350 /*
351 * Currently stuck as a macro due to indirect forward reference to
352 * linux/mmzone.h's __section_mem_map_addr() definition:
353 */
354 #define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
355
356 /*
357 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
358 *
359 * this macro returns the index of the entry in the pmd page which would
360 * control the given virtual address
361 */
362 static inline unsigned pmd_index(unsigned long address)
363 {
364 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
365 }
366
367 /*
368 * Conversion functions: convert a page and protection to a page entry,
369 * and a page entry and page directory to the page they refer to.
370 *
371 * (Currently stuck as a macro because of indirect forward reference
372 * to linux/mm.h:page_to_nid())
373 */
374 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
375
376 /*
377 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
378 *
379 * this function returns the index of the entry in the pte page which would
380 * control the given virtual address
381 */
382 static inline unsigned pte_index(unsigned long address)
383 {
384 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
385 }
386
387 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
388 {
389 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
390 }
391
392 static inline int pmd_bad(pmd_t pmd)
393 {
394 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
395 }
396
397 static inline unsigned long pages_to_mb(unsigned long npg)
398 {
399 return npg >> (20 - PAGE_SHIFT);
400 }
401
402 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
403 remap_pfn_range(vma, vaddr, pfn, size, prot)
404
405 #if PAGETABLE_LEVELS > 2
406 static inline int pud_none(pud_t pud)
407 {
408 return native_pud_val(pud) == 0;
409 }
410
411 static inline int pud_present(pud_t pud)
412 {
413 return pud_flags(pud) & _PAGE_PRESENT;
414 }
415
416 static inline unsigned long pud_page_vaddr(pud_t pud)
417 {
418 return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
419 }
420
421 /*
422 * Currently stuck as a macro due to indirect forward reference to
423 * linux/mmzone.h's __section_mem_map_addr() definition:
424 */
425 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
426
427 /* Find an entry in the second-level page table.. */
428 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
429 {
430 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
431 }
432
433 static inline unsigned long pmd_pfn(pmd_t pmd)
434 {
435 return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
436 }
437
438 static inline int pud_large(pud_t pud)
439 {
440 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
441 (_PAGE_PSE | _PAGE_PRESENT);
442 }
443
444 static inline int pud_bad(pud_t pud)
445 {
446 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
447 }
448 #else
449 static inline int pud_large(pud_t pud)
450 {
451 return 0;
452 }
453 #endif /* PAGETABLE_LEVELS > 2 */
454
455 #if PAGETABLE_LEVELS > 3
456 static inline int pgd_present(pgd_t pgd)
457 {
458 return pgd_flags(pgd) & _PAGE_PRESENT;
459 }
460
461 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
462 {
463 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
464 }
465
466 /*
467 * Currently stuck as a macro due to indirect forward reference to
468 * linux/mmzone.h's __section_mem_map_addr() definition:
469 */
470 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
471
472 /* to find an entry in a page-table-directory. */
473 static inline unsigned pud_index(unsigned long address)
474 {
475 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
476 }
477
478 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
479 {
480 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
481 }
482
483 static inline int pgd_bad(pgd_t pgd)
484 {
485 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
486 }
487
488 static inline int pgd_none(pgd_t pgd)
489 {
490 return !native_pgd_val(pgd);
491 }
492 #endif /* PAGETABLE_LEVELS > 3 */
493
494 #endif /* __ASSEMBLY__ */
495
496 /*
497 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
498 *
499 * this macro returns the index of the entry in the pgd page which would
500 * control the given virtual address
501 */
502 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
503
504 /*
505 * pgd_offset() returns a (pgd_t *)
506 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
507 */
508 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
509 /*
510 * a shortcut which implies the use of the kernel's pgd, instead
511 * of a process's
512 */
513 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
514
515
516 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
517 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
518
519 #ifndef __ASSEMBLY__
520
521 extern int direct_gbpages;
522
523 /* local pte updates need not use xchg for locking */
524 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
525 {
526 pte_t res = *ptep;
527
528 /* Pure native function needs no input for mm, addr */
529 native_pte_clear(NULL, 0, ptep);
530 return res;
531 }
532
533 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
534 pte_t *ptep , pte_t pte)
535 {
536 native_set_pte(ptep, pte);
537 }
538
539 #ifndef CONFIG_PARAVIRT
540 /*
541 * Rules for using pte_update - it must be called after any PTE update which
542 * has not been done using the set_pte / clear_pte interfaces. It is used by
543 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
544 * updates should either be sets, clears, or set_pte_atomic for P->P
545 * transitions, which means this hook should only be called for user PTEs.
546 * This hook implies a P->P protection or access change has taken place, which
547 * requires a subsequent TLB flush. The notification can optionally be delayed
548 * until the TLB flush event by using the pte_update_defer form of the
549 * interface, but care must be taken to assure that the flush happens while
550 * still holding the same page table lock so that the shadow and primary pages
551 * do not become out of sync on SMP.
552 */
553 #define pte_update(mm, addr, ptep) do { } while (0)
554 #define pte_update_defer(mm, addr, ptep) do { } while (0)
555 #endif
556
557 /*
558 * We only update the dirty/accessed state if we set
559 * the dirty bit by hand in the kernel, since the hardware
560 * will do the accessed bit for us, and we don't want to
561 * race with other CPU's that might be updating the dirty
562 * bit at the same time.
563 */
564 struct vm_area_struct;
565
566 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
567 extern int ptep_set_access_flags(struct vm_area_struct *vma,
568 unsigned long address, pte_t *ptep,
569 pte_t entry, int dirty);
570
571 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
572 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
573 unsigned long addr, pte_t *ptep);
574
575 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
576 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
577 unsigned long address, pte_t *ptep);
578
579 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
580 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
581 pte_t *ptep)
582 {
583 pte_t pte = native_ptep_get_and_clear(ptep);
584 pte_update(mm, addr, ptep);
585 return pte;
586 }
587
588 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
589 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
590 unsigned long addr, pte_t *ptep,
591 int full)
592 {
593 pte_t pte;
594 if (full) {
595 /*
596 * Full address destruction in progress; paravirt does not
597 * care about updates and native needs no locking
598 */
599 pte = native_local_ptep_get_and_clear(ptep);
600 } else {
601 pte = ptep_get_and_clear(mm, addr, ptep);
602 }
603 return pte;
604 }
605
606 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
607 static inline void ptep_set_wrprotect(struct mm_struct *mm,
608 unsigned long addr, pte_t *ptep)
609 {
610 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
611 pte_update(mm, addr, ptep);
612 }
613
614 /*
615 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
616 *
617 * dst - pointer to pgd range anwhere on a pgd page
618 * src - ""
619 * count - the number of pgds to copy.
620 *
621 * dst and src can be on the same page, but the range must not overlap,
622 * and must not cross a page boundary.
623 */
624 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
625 {
626 memcpy(dst, src, count * sizeof(pgd_t));
627 }
628
629
630 #include <asm-generic/pgtable.h>
631 #endif /* __ASSEMBLY__ */
632
633 #endif /* _ASM_X86_PGTABLE_H */
634
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