1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2003 Ralf Baechle
7 */
8 #ifndef _ASM_PGTABLE_H
9 #define _ASM_PGTABLE_H
10
11 #include <linux/mm_types.h>
12 #include <linux/mmzone.h>
13 #ifdef CONFIG_32BIT
14 #include <asm/pgtable-32.h>
15 #endif
16 #ifdef CONFIG_64BIT
17 #include <asm/pgtable-64.h>
18 #endif
19
20 #include <asm/cmpxchg.h>
21 #include <asm/io.h>
22 #include <asm/pgtable-bits.h>
23 #include <asm/cpu-features.h>
24
25 struct mm_struct;
26 struct vm_area_struct;
27
28 #define PAGE_SHARED vm_get_page_prot(VM_READ|VM_WRITE|VM_SHARED)
29
30 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
31 _PAGE_GLOBAL | _page_cachable_default)
32 #define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
33 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
34 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
35 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
36
37 /*
38 * If _PAGE_NO_EXEC is not defined, we can't do page protection for
39 * execute, and consider it to be the same as read. Also, write
40 * permissions imply read permissions. This is the closest we can get
41 * by reasonable means..
42 */
43
44 extern unsigned long _page_cachable_default;
45 extern void __update_cache(unsigned long address, pte_t pte);
46
47 /*
48 * ZERO_PAGE is a global shared page that is always zero; used
49 * for zero-mapped memory areas etc..
50 */
51
52 extern unsigned long empty_zero_page;
53 extern unsigned long zero_page_mask;
54
55 #define ZERO_PAGE(vaddr) \
56 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
57 #define __HAVE_COLOR_ZERO_PAGE
58
59 extern void paging_init(void);
60
61 /*
62 * Conversion functions: convert a page and protection to a page entry,
63 * and a page entry and page directory to the page they refer to.
64 */
65 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
66
pmd_pfn(pmd_t pmd)67 static inline unsigned long pmd_pfn(pmd_t pmd)
68 {
69 return pmd_val(pmd) >> _PFN_SHIFT;
70 }
71
72 #ifndef CONFIG_MIPS_HUGE_TLB_SUPPORT
73 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
74 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
75
76 #define pmd_page_vaddr(pmd) pmd_val(pmd)
77
78 #define htw_stop() \
79 do { \
80 unsigned long __flags; \
81 \
82 if (cpu_has_htw) { \
83 local_irq_save(__flags); \
84 if(!raw_current_cpu_data.htw_seq++) { \
85 write_c0_pwctl(read_c0_pwctl() & \
86 ~(1 << MIPS_PWCTL_PWEN_SHIFT)); \
87 back_to_back_c0_hazard(); \
88 } \
89 local_irq_restore(__flags); \
90 } \
91 } while(0)
92
93 #define htw_start() \
94 do { \
95 unsigned long __flags; \
96 \
97 if (cpu_has_htw) { \
98 local_irq_save(__flags); \
99 if (!--raw_current_cpu_data.htw_seq) { \
100 write_c0_pwctl(read_c0_pwctl() | \
101 (1 << MIPS_PWCTL_PWEN_SHIFT)); \
102 back_to_back_c0_hazard(); \
103 } \
104 local_irq_restore(__flags); \
105 } \
106 } while(0)
107
108 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
109 pte_t *ptep, pte_t pteval);
110
111 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
112
113 #ifdef CONFIG_XPA
114 # define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL))
115 #else
116 # define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
117 #endif
118
119 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
120 #define pte_no_exec(pte) ((pte).pte_low & _PAGE_NO_EXEC)
121
set_pte(pte_t * ptep,pte_t pte)122 static inline void set_pte(pte_t *ptep, pte_t pte)
123 {
124 ptep->pte_high = pte.pte_high;
125 smp_wmb();
126 ptep->pte_low = pte.pte_low;
127
128 #ifdef CONFIG_XPA
129 if (pte.pte_high & _PAGE_GLOBAL) {
130 #else
131 if (pte.pte_low & _PAGE_GLOBAL) {
132 #endif
133 pte_t *buddy = ptep_buddy(ptep);
134 /*
135 * Make sure the buddy is global too (if it's !none,
136 * it better already be global)
137 */
138 if (pte_none(*buddy)) {
139 if (!IS_ENABLED(CONFIG_XPA))
140 buddy->pte_low |= _PAGE_GLOBAL;
141 buddy->pte_high |= _PAGE_GLOBAL;
142 }
143 }
144 }
145
146 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
147 {
148 pte_t null = __pte(0);
149
150 htw_stop();
151 /* Preserve global status for the pair */
152 if (IS_ENABLED(CONFIG_XPA)) {
153 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
154 null.pte_high = _PAGE_GLOBAL;
155 } else {
156 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
157 null.pte_low = null.pte_high = _PAGE_GLOBAL;
158 }
159
160 set_pte_at(mm, addr, ptep, null);
161 htw_start();
162 }
163 #else
164
165 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
166 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
167 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC)
168
169 /*
170 * Certain architectures need to do special things when pte's
171 * within a page table are directly modified. Thus, the following
172 * hook is made available.
173 */
174 static inline void set_pte(pte_t *ptep, pte_t pteval)
175 {
176 *ptep = pteval;
177 #if !defined(CONFIG_CPU_R3K_TLB)
178 if (pte_val(pteval) & _PAGE_GLOBAL) {
179 pte_t *buddy = ptep_buddy(ptep);
180 /*
181 * Make sure the buddy is global too (if it's !none,
182 * it better already be global)
183 */
184 # if defined(CONFIG_PHYS_ADDR_T_64BIT) && !defined(CONFIG_CPU_MIPS32)
185 cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL);
186 # else
187 cmpxchg(&buddy->pte, 0, _PAGE_GLOBAL);
188 # endif
189 }
190 #endif
191 }
192
193 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
194 {
195 htw_stop();
196 #if !defined(CONFIG_CPU_R3K_TLB)
197 /* Preserve global status for the pair */
198 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
199 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
200 else
201 #endif
202 set_pte_at(mm, addr, ptep, __pte(0));
203 htw_start();
204 }
205 #endif
206
207 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
208 pte_t *ptep, pte_t pteval)
209 {
210
211 if (!pte_present(pteval))
212 goto cache_sync_done;
213
214 if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
215 goto cache_sync_done;
216
217 __update_cache(addr, pteval);
218 cache_sync_done:
219 set_pte(ptep, pteval);
220 }
221
222 /*
223 * (pmds are folded into puds so this doesn't get actually called,
224 * but the define is needed for a generic inline function.)
225 */
226 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
227
228 #ifndef __PAGETABLE_PMD_FOLDED
229 /*
230 * (puds are folded into pgds so this doesn't get actually called,
231 * but the define is needed for a generic inline function.)
232 */
233 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
234 #endif
235
236 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
237 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
238 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
239
240 /*
241 * We used to declare this array with size but gcc 3.3 and older are not able
242 * to find that this expression is a constant, so the size is dropped.
243 */
244 extern pgd_t swapper_pg_dir[];
245
246 /*
247 * Platform specific pte_special() and pte_mkspecial() definitions
248 * are required only when ARCH_HAS_PTE_SPECIAL is enabled.
249 */
250 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
251 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
252 static inline int pte_special(pte_t pte)
253 {
254 return pte.pte_low & _PAGE_SPECIAL;
255 }
256
257 static inline pte_t pte_mkspecial(pte_t pte)
258 {
259 pte.pte_low |= _PAGE_SPECIAL;
260 return pte;
261 }
262 #else
263 static inline int pte_special(pte_t pte)
264 {
265 return pte_val(pte) & _PAGE_SPECIAL;
266 }
267
268 static inline pte_t pte_mkspecial(pte_t pte)
269 {
270 pte_val(pte) |= _PAGE_SPECIAL;
271 return pte;
272 }
273 #endif
274 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
275
276 /*
277 * The following only work if pte_present() is true.
278 * Undefined behaviour if not..
279 */
280 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
281 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
282 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
283 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
284
285 static inline pte_t pte_wrprotect(pte_t pte)
286 {
287 pte.pte_low &= ~_PAGE_WRITE;
288 if (!IS_ENABLED(CONFIG_XPA))
289 pte.pte_low &= ~_PAGE_SILENT_WRITE;
290 pte.pte_high &= ~_PAGE_SILENT_WRITE;
291 return pte;
292 }
293
294 static inline pte_t pte_mkclean(pte_t pte)
295 {
296 pte.pte_low &= ~_PAGE_MODIFIED;
297 if (!IS_ENABLED(CONFIG_XPA))
298 pte.pte_low &= ~_PAGE_SILENT_WRITE;
299 pte.pte_high &= ~_PAGE_SILENT_WRITE;
300 return pte;
301 }
302
303 static inline pte_t pte_mkold(pte_t pte)
304 {
305 pte.pte_low &= ~_PAGE_ACCESSED;
306 if (!IS_ENABLED(CONFIG_XPA))
307 pte.pte_low &= ~_PAGE_SILENT_READ;
308 pte.pte_high &= ~_PAGE_SILENT_READ;
309 return pte;
310 }
311
312 static inline pte_t pte_mkwrite(pte_t pte)
313 {
314 pte.pte_low |= _PAGE_WRITE;
315 if (pte.pte_low & _PAGE_MODIFIED) {
316 if (!IS_ENABLED(CONFIG_XPA))
317 pte.pte_low |= _PAGE_SILENT_WRITE;
318 pte.pte_high |= _PAGE_SILENT_WRITE;
319 }
320 return pte;
321 }
322
323 static inline pte_t pte_mkdirty(pte_t pte)
324 {
325 pte.pte_low |= _PAGE_MODIFIED;
326 if (pte.pte_low & _PAGE_WRITE) {
327 if (!IS_ENABLED(CONFIG_XPA))
328 pte.pte_low |= _PAGE_SILENT_WRITE;
329 pte.pte_high |= _PAGE_SILENT_WRITE;
330 }
331 return pte;
332 }
333
334 static inline pte_t pte_mkyoung(pte_t pte)
335 {
336 pte.pte_low |= _PAGE_ACCESSED;
337 if (!(pte.pte_low & _PAGE_NO_READ)) {
338 if (!IS_ENABLED(CONFIG_XPA))
339 pte.pte_low |= _PAGE_SILENT_READ;
340 pte.pte_high |= _PAGE_SILENT_READ;
341 }
342 return pte;
343 }
344 #else
345 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
346 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
347 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
348
349 static inline pte_t pte_wrprotect(pte_t pte)
350 {
351 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
352 return pte;
353 }
354
355 static inline pte_t pte_mkclean(pte_t pte)
356 {
357 pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
358 return pte;
359 }
360
361 static inline pte_t pte_mkold(pte_t pte)
362 {
363 pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
364 return pte;
365 }
366
367 static inline pte_t pte_mkwrite(pte_t pte)
368 {
369 pte_val(pte) |= _PAGE_WRITE;
370 if (pte_val(pte) & _PAGE_MODIFIED)
371 pte_val(pte) |= _PAGE_SILENT_WRITE;
372 return pte;
373 }
374
375 static inline pte_t pte_mkdirty(pte_t pte)
376 {
377 pte_val(pte) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY;
378 if (pte_val(pte) & _PAGE_WRITE)
379 pte_val(pte) |= _PAGE_SILENT_WRITE;
380 return pte;
381 }
382
383 static inline pte_t pte_mkyoung(pte_t pte)
384 {
385 pte_val(pte) |= _PAGE_ACCESSED;
386 if (!(pte_val(pte) & _PAGE_NO_READ))
387 pte_val(pte) |= _PAGE_SILENT_READ;
388 return pte;
389 }
390
391 #define pte_sw_mkyoung pte_mkyoung
392
393 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
394 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
395
396 static inline pte_t pte_mkhuge(pte_t pte)
397 {
398 pte_val(pte) |= _PAGE_HUGE;
399 return pte;
400 }
401
402 #define pmd_write pmd_write
403 static inline int pmd_write(pmd_t pmd)
404 {
405 return !!(pmd_val(pmd) & _PAGE_WRITE);
406 }
407
408 static inline struct page *pmd_page(pmd_t pmd)
409 {
410 if (pmd_val(pmd) & _PAGE_HUGE)
411 return pfn_to_page(pmd_pfn(pmd));
412
413 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
414 }
415 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
416
417 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
418 static inline bool pte_soft_dirty(pte_t pte)
419 {
420 return pte_val(pte) & _PAGE_SOFT_DIRTY;
421 }
422 #define pte_swp_soft_dirty pte_soft_dirty
423
424 static inline pte_t pte_mksoft_dirty(pte_t pte)
425 {
426 pte_val(pte) |= _PAGE_SOFT_DIRTY;
427 return pte;
428 }
429 #define pte_swp_mksoft_dirty pte_mksoft_dirty
430
431 static inline pte_t pte_clear_soft_dirty(pte_t pte)
432 {
433 pte_val(pte) &= ~(_PAGE_SOFT_DIRTY);
434 return pte;
435 }
436 #define pte_swp_clear_soft_dirty pte_clear_soft_dirty
437
438 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
439
440 #endif
441
442 /*
443 * Macro to make mark a page protection value as "uncacheable". Note
444 * that "protection" is really a misnomer here as the protection value
445 * contains the memory attribute bits, dirty bits, and various other
446 * bits as well.
447 */
448 #define pgprot_noncached pgprot_noncached
449
450 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
451 {
452 unsigned long prot = pgprot_val(_prot);
453
454 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
455
456 return __pgprot(prot);
457 }
458
459 #define pgprot_writecombine pgprot_writecombine
460
461 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
462 {
463 unsigned long prot = pgprot_val(_prot);
464
465 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
466 prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
467
468 return __pgprot(prot);
469 }
470
471 static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
472 unsigned long address)
473 {
474 }
475
476 #define __HAVE_ARCH_PTE_SAME
477 static inline int pte_same(pte_t pte_a, pte_t pte_b)
478 {
479 return pte_val(pte_a) == pte_val(pte_b);
480 }
481
482 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
483 static inline int ptep_set_access_flags(struct vm_area_struct *vma,
484 unsigned long address, pte_t *ptep,
485 pte_t entry, int dirty)
486 {
487 if (!pte_same(*ptep, entry))
488 set_pte_at(vma->vm_mm, address, ptep, entry);
489 /*
490 * update_mmu_cache will unconditionally execute, handling both
491 * the case that the PTE changed and the spurious fault case.
492 */
493 return true;
494 }
495
496 /*
497 * Conversion functions: convert a page and protection to a page entry,
498 * and a page entry and page directory to the page they refer to.
499 */
500 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
501
502 #if defined(CONFIG_XPA)
503 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
504 {
505 pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
506 pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
507 pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK;
508 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
509 return pte;
510 }
511 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
512 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
513 {
514 pte.pte_low &= _PAGE_CHG_MASK;
515 pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
516 pte.pte_low |= pgprot_val(newprot);
517 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
518 return pte;
519 }
520 #else
521 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
522 {
523 pte_val(pte) &= _PAGE_CHG_MASK;
524 pte_val(pte) |= pgprot_val(newprot) & ~_PAGE_CHG_MASK;
525 if ((pte_val(pte) & _PAGE_ACCESSED) && !(pte_val(pte) & _PAGE_NO_READ))
526 pte_val(pte) |= _PAGE_SILENT_READ;
527 return pte;
528 }
529 #endif
530
531 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
532 static inline int pte_swp_exclusive(pte_t pte)
533 {
534 return pte.pte_low & _PAGE_SWP_EXCLUSIVE;
535 }
536
537 static inline pte_t pte_swp_mkexclusive(pte_t pte)
538 {
539 pte.pte_low |= _PAGE_SWP_EXCLUSIVE;
540 return pte;
541 }
542
543 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
544 {
545 pte.pte_low &= ~_PAGE_SWP_EXCLUSIVE;
546 return pte;
547 }
548 #else
549 static inline int pte_swp_exclusive(pte_t pte)
550 {
551 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
552 }
553
554 static inline pte_t pte_swp_mkexclusive(pte_t pte)
555 {
556 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
557 return pte;
558 }
559
560 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
561 {
562 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
563 return pte;
564 }
565 #endif
566
567 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
568 pte_t pte);
569
570 static inline void update_mmu_cache(struct vm_area_struct *vma,
571 unsigned long address, pte_t *ptep)
572 {
573 pte_t pte = *ptep;
574 __update_tlb(vma, address, pte);
575 }
576
577 #define __HAVE_ARCH_UPDATE_MMU_TLB
578 #define update_mmu_tlb update_mmu_cache
579
580 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
581 unsigned long address, pmd_t *pmdp)
582 {
583 pte_t pte = *(pte_t *)pmdp;
584
585 __update_tlb(vma, address, pte);
586 }
587
588 /*
589 * Allow physical addresses to be fixed up to help 36-bit peripherals.
590 */
591 #ifdef CONFIG_MIPS_FIXUP_BIGPHYS_ADDR
592 phys_addr_t fixup_bigphys_addr(phys_addr_t addr, phys_addr_t size);
593 int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long vaddr,
594 unsigned long pfn, unsigned long size, pgprot_t prot);
595 #define io_remap_pfn_range io_remap_pfn_range
596 #else
597 #define fixup_bigphys_addr(addr, size) (addr)
598 #endif /* CONFIG_MIPS_FIXUP_BIGPHYS_ADDR */
599
600 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
601
602 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
603 #define pmdp_establish generic_pmdp_establish
604
605 #define has_transparent_hugepage has_transparent_hugepage
606 extern int has_transparent_hugepage(void);
607
608 static inline int pmd_trans_huge(pmd_t pmd)
609 {
610 return !!(pmd_val(pmd) & _PAGE_HUGE);
611 }
612
613 static inline pmd_t pmd_mkhuge(pmd_t pmd)
614 {
615 pmd_val(pmd) |= _PAGE_HUGE;
616
617 return pmd;
618 }
619
620 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
621 pmd_t *pmdp, pmd_t pmd);
622
623 static inline pmd_t pmd_wrprotect(pmd_t pmd)
624 {
625 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
626 return pmd;
627 }
628
629 static inline pmd_t pmd_mkwrite(pmd_t pmd)
630 {
631 pmd_val(pmd) |= _PAGE_WRITE;
632 if (pmd_val(pmd) & _PAGE_MODIFIED)
633 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
634
635 return pmd;
636 }
637
638 static inline int pmd_dirty(pmd_t pmd)
639 {
640 return !!(pmd_val(pmd) & _PAGE_MODIFIED);
641 }
642
643 static inline pmd_t pmd_mkclean(pmd_t pmd)
644 {
645 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
646 return pmd;
647 }
648
649 static inline pmd_t pmd_mkdirty(pmd_t pmd)
650 {
651 pmd_val(pmd) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY;
652 if (pmd_val(pmd) & _PAGE_WRITE)
653 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
654
655 return pmd;
656 }
657
658 #define pmd_young pmd_young
659 static inline int pmd_young(pmd_t pmd)
660 {
661 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
662 }
663
664 static inline pmd_t pmd_mkold(pmd_t pmd)
665 {
666 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
667
668 return pmd;
669 }
670
671 static inline pmd_t pmd_mkyoung(pmd_t pmd)
672 {
673 pmd_val(pmd) |= _PAGE_ACCESSED;
674
675 if (!(pmd_val(pmd) & _PAGE_NO_READ))
676 pmd_val(pmd) |= _PAGE_SILENT_READ;
677
678 return pmd;
679 }
680
681 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
682 static inline int pmd_soft_dirty(pmd_t pmd)
683 {
684 return !!(pmd_val(pmd) & _PAGE_SOFT_DIRTY);
685 }
686
687 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
688 {
689 pmd_val(pmd) |= _PAGE_SOFT_DIRTY;
690 return pmd;
691 }
692
693 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
694 {
695 pmd_val(pmd) &= ~(_PAGE_SOFT_DIRTY);
696 return pmd;
697 }
698
699 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
700
701 /* Extern to avoid header file madness */
702 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
703
704 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
705 {
706 pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) |
707 (pgprot_val(newprot) & ~_PAGE_CHG_MASK);
708 return pmd;
709 }
710
711 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
712 {
713 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
714
715 return pmd;
716 }
717
718 /*
719 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
720 * different prototype.
721 */
722 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
723 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
724 unsigned long address, pmd_t *pmdp)
725 {
726 pmd_t old = *pmdp;
727
728 pmd_clear(pmdp);
729
730 return old;
731 }
732
733 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
734
735 #ifdef _PAGE_HUGE
736 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0)
737 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0)
738 #endif
739
740 #define gup_fast_permitted(start, end) (!cpu_has_dc_aliases)
741
742 /*
743 * We provide our own get_unmapped area to cope with the virtual aliasing
744 * constraints placed on us by the cache architecture.
745 */
746 #define HAVE_ARCH_UNMAPPED_AREA
747 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
748
749 #endif /* _ASM_PGTABLE_H */
750