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Linux/arch/mips/include/asm/pgtable.h

  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/io.h>
 21 #include <asm/pgtable-bits.h>
 22 
 23 struct mm_struct;
 24 struct vm_area_struct;
 25 
 26 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_NO_READ | \
 27                                  _page_cachable_default)
 28 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
 29                                  _page_cachable_default)
 30 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \
 31                                  _page_cachable_default)
 32 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | \
 33                                  _page_cachable_default)
 34 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
 35                                  _PAGE_GLOBAL | _page_cachable_default)
 36 #define PAGE_KERNEL_NC  __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
 37                                  _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
 38 #define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
 39                                  _page_cachable_default)
 40 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
 41                         __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
 42 
 43 /*
 44  * If _PAGE_NO_EXEC is not defined, we can't do page protection for
 45  * execute, and consider it to be the same as read. Also, write
 46  * permissions imply read permissions. This is the closest we can get
 47  * by reasonable means..
 48  */
 49 
 50 /*
 51  * Dummy values to fill the table in mmap.c
 52  * The real values will be generated at runtime
 53  */
 54 #define __P000 __pgprot(0)
 55 #define __P001 __pgprot(0)
 56 #define __P010 __pgprot(0)
 57 #define __P011 __pgprot(0)
 58 #define __P100 __pgprot(0)
 59 #define __P101 __pgprot(0)
 60 #define __P110 __pgprot(0)
 61 #define __P111 __pgprot(0)
 62 
 63 #define __S000 __pgprot(0)
 64 #define __S001 __pgprot(0)
 65 #define __S010 __pgprot(0)
 66 #define __S011 __pgprot(0)
 67 #define __S100 __pgprot(0)
 68 #define __S101 __pgprot(0)
 69 #define __S110 __pgprot(0)
 70 #define __S111 __pgprot(0)
 71 
 72 extern unsigned long _page_cachable_default;
 73 
 74 /*
 75  * ZERO_PAGE is a global shared page that is always zero; used
 76  * for zero-mapped memory areas etc..
 77  */
 78 
 79 extern unsigned long empty_zero_page;
 80 extern unsigned long zero_page_mask;
 81 
 82 #define ZERO_PAGE(vaddr) \
 83         (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
 84 #define __HAVE_COLOR_ZERO_PAGE
 85 
 86 extern void paging_init(void);
 87 
 88 /*
 89  * Conversion functions: convert a page and protection to a page entry,
 90  * and a page entry and page directory to the page they refer to.
 91  */
 92 #define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))
 93 
 94 #define __pmd_page(pmd)         (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
 95 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
 96 #define pmd_page(pmd)           __pmd_page(pmd)
 97 #endif /* CONFIG_TRANSPARENT_HUGEPAGE  */
 98 
 99 #define pmd_page_vaddr(pmd)     pmd_val(pmd)
100 
101 #define htw_stop()                                                      \
102 do {                                                                    \
103         unsigned long flags;                                            \
104                                                                         \
105         if (cpu_has_htw) {                                              \
106                 local_irq_save(flags);                                  \
107                 if(!raw_current_cpu_data.htw_seq++) {                   \
108                         write_c0_pwctl(read_c0_pwctl() &                \
109                                        ~(1 << MIPS_PWCTL_PWEN_SHIFT));  \
110                         back_to_back_c0_hazard();                       \
111                 }                                                       \
112                 local_irq_restore(flags);                               \
113         }                                                               \
114 } while(0)
115 
116 #define htw_start()                                                     \
117 do {                                                                    \
118         unsigned long flags;                                            \
119                                                                         \
120         if (cpu_has_htw) {                                              \
121                 local_irq_save(flags);                                  \
122                 if (!--raw_current_cpu_data.htw_seq) {                  \
123                         write_c0_pwctl(read_c0_pwctl() |                \
124                                        (1 << MIPS_PWCTL_PWEN_SHIFT));   \
125                         back_to_back_c0_hazard();                       \
126                 }                                                       \
127                 local_irq_restore(flags);                               \
128         }                                                               \
129 } while(0)
130 
131 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
132                               pte_t *ptep, pte_t pteval);
133 
134 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
135 
136 #ifdef CONFIG_XPA
137 # define pte_none(pte)          (!(((pte).pte_high) & ~_PAGE_GLOBAL))
138 #else
139 # define pte_none(pte)          (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
140 #endif
141 
142 #define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
143 #define pte_no_exec(pte)        ((pte).pte_low & _PAGE_NO_EXEC)
144 
145 static inline void set_pte(pte_t *ptep, pte_t pte)
146 {
147         ptep->pte_high = pte.pte_high;
148         smp_wmb();
149         ptep->pte_low = pte.pte_low;
150 
151 #ifdef CONFIG_XPA
152         if (pte.pte_high & _PAGE_GLOBAL) {
153 #else
154         if (pte.pte_low & _PAGE_GLOBAL) {
155 #endif
156                 pte_t *buddy = ptep_buddy(ptep);
157                 /*
158                  * Make sure the buddy is global too (if it's !none,
159                  * it better already be global)
160                  */
161                 if (pte_none(*buddy)) {
162                         if (!IS_ENABLED(CONFIG_XPA))
163                                 buddy->pte_low |= _PAGE_GLOBAL;
164                         buddy->pte_high |= _PAGE_GLOBAL;
165                 }
166         }
167 }
168 
169 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
170 {
171         pte_t null = __pte(0);
172 
173         htw_stop();
174         /* Preserve global status for the pair */
175         if (IS_ENABLED(CONFIG_XPA)) {
176                 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
177                         null.pte_high = _PAGE_GLOBAL;
178         } else {
179                 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
180                         null.pte_low = null.pte_high = _PAGE_GLOBAL;
181         }
182 
183         set_pte_at(mm, addr, ptep, null);
184         htw_start();
185 }
186 #else
187 
188 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
189 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
190 #define pte_no_exec(pte)        (pte_val(pte) & _PAGE_NO_EXEC)
191 
192 /*
193  * Certain architectures need to do special things when pte's
194  * within a page table are directly modified.  Thus, the following
195  * hook is made available.
196  */
197 static inline void set_pte(pte_t *ptep, pte_t pteval)
198 {
199         *ptep = pteval;
200 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
201         if (pte_val(pteval) & _PAGE_GLOBAL) {
202                 pte_t *buddy = ptep_buddy(ptep);
203                 /*
204                  * Make sure the buddy is global too (if it's !none,
205                  * it better already be global)
206                  */
207 #ifdef CONFIG_SMP
208                 /*
209                  * For SMP, multiple CPUs can race, so we need to do
210                  * this atomically.
211                  */
212                 unsigned long page_global = _PAGE_GLOBAL;
213                 unsigned long tmp;
214 
215                 if (kernel_uses_llsc && R10000_LLSC_WAR) {
216                         __asm__ __volatile__ (
217                         "       .set    arch=r4000                      \n"
218                         "       .set    push                            \n"
219                         "       .set    noreorder                       \n"
220                         "1:"    __LL    "%[tmp], %[buddy]               \n"
221                         "       bnez    %[tmp], 2f                      \n"
222                         "        or     %[tmp], %[tmp], %[global]       \n"
223                                 __SC    "%[tmp], %[buddy]               \n"
224                         "       beqzl   %[tmp], 1b                      \n"
225                         "       nop                                     \n"
226                         "2:                                             \n"
227                         "       .set    pop                             \n"
228                         "       .set    mips0                           \n"
229                         : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
230                         : [global] "r" (page_global));
231                 } else if (kernel_uses_llsc) {
232                         __asm__ __volatile__ (
233                         "       .set    "MIPS_ISA_ARCH_LEVEL"           \n"
234                         "       .set    push                            \n"
235                         "       .set    noreorder                       \n"
236                         "1:"    __LL    "%[tmp], %[buddy]               \n"
237                         "       bnez    %[tmp], 2f                      \n"
238                         "        or     %[tmp], %[tmp], %[global]       \n"
239                                 __SC    "%[tmp], %[buddy]               \n"
240                         "       beqz    %[tmp], 1b                      \n"
241                         "       nop                                     \n"
242                         "2:                                             \n"
243                         "       .set    pop                             \n"
244                         "       .set    mips0                           \n"
245                         : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
246                         : [global] "r" (page_global));
247                 }
248 #else /* !CONFIG_SMP */
249                 if (pte_none(*buddy))
250                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
251 #endif /* CONFIG_SMP */
252         }
253 #endif
254 }
255 
256 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
257 {
258         htw_stop();
259 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
260         /* Preserve global status for the pair */
261         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
262                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
263         else
264 #endif
265                 set_pte_at(mm, addr, ptep, __pte(0));
266         htw_start();
267 }
268 #endif
269 
270 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
271                               pte_t *ptep, pte_t pteval)
272 {
273         extern void __update_cache(unsigned long address, pte_t pte);
274 
275         if (!pte_present(pteval))
276                 goto cache_sync_done;
277 
278         if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
279                 goto cache_sync_done;
280 
281         __update_cache(addr, pteval);
282 cache_sync_done:
283         set_pte(ptep, pteval);
284 }
285 
286 /*
287  * (pmds are folded into puds so this doesn't get actually called,
288  * but the define is needed for a generic inline function.)
289  */
290 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
291 
292 #ifndef __PAGETABLE_PMD_FOLDED
293 /*
294  * (puds are folded into pgds so this doesn't get actually called,
295  * but the define is needed for a generic inline function.)
296  */
297 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
298 #endif
299 
300 #define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
301 #define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
302 #define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
303 
304 /*
305  * We used to declare this array with size but gcc 3.3 and older are not able
306  * to find that this expression is a constant, so the size is dropped.
307  */
308 extern pgd_t swapper_pg_dir[];
309 
310 /*
311  * The following only work if pte_present() is true.
312  * Undefined behaviour if not..
313  */
314 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
315 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
316 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
317 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
318 
319 static inline pte_t pte_wrprotect(pte_t pte)
320 {
321         pte.pte_low  &= ~_PAGE_WRITE;
322         if (!IS_ENABLED(CONFIG_XPA))
323                 pte.pte_low &= ~_PAGE_SILENT_WRITE;
324         pte.pte_high &= ~_PAGE_SILENT_WRITE;
325         return pte;
326 }
327 
328 static inline pte_t pte_mkclean(pte_t pte)
329 {
330         pte.pte_low  &= ~_PAGE_MODIFIED;
331         if (!IS_ENABLED(CONFIG_XPA))
332                 pte.pte_low &= ~_PAGE_SILENT_WRITE;
333         pte.pte_high &= ~_PAGE_SILENT_WRITE;
334         return pte;
335 }
336 
337 static inline pte_t pte_mkold(pte_t pte)
338 {
339         pte.pte_low  &= ~_PAGE_ACCESSED;
340         if (!IS_ENABLED(CONFIG_XPA))
341                 pte.pte_low &= ~_PAGE_SILENT_READ;
342         pte.pte_high &= ~_PAGE_SILENT_READ;
343         return pte;
344 }
345 
346 static inline pte_t pte_mkwrite(pte_t pte)
347 {
348         pte.pte_low |= _PAGE_WRITE;
349         if (pte.pte_low & _PAGE_MODIFIED) {
350                 if (!IS_ENABLED(CONFIG_XPA))
351                         pte.pte_low |= _PAGE_SILENT_WRITE;
352                 pte.pte_high |= _PAGE_SILENT_WRITE;
353         }
354         return pte;
355 }
356 
357 static inline pte_t pte_mkdirty(pte_t pte)
358 {
359         pte.pte_low |= _PAGE_MODIFIED;
360         if (pte.pte_low & _PAGE_WRITE) {
361                 if (!IS_ENABLED(CONFIG_XPA))
362                         pte.pte_low |= _PAGE_SILENT_WRITE;
363                 pte.pte_high |= _PAGE_SILENT_WRITE;
364         }
365         return pte;
366 }
367 
368 static inline pte_t pte_mkyoung(pte_t pte)
369 {
370         pte.pte_low |= _PAGE_ACCESSED;
371         if (!(pte.pte_low & _PAGE_NO_READ)) {
372                 if (!IS_ENABLED(CONFIG_XPA))
373                         pte.pte_low |= _PAGE_SILENT_READ;
374                 pte.pte_high |= _PAGE_SILENT_READ;
375         }
376         return pte;
377 }
378 #else
379 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
380 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
381 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
382 
383 static inline pte_t pte_wrprotect(pte_t pte)
384 {
385         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
386         return pte;
387 }
388 
389 static inline pte_t pte_mkclean(pte_t pte)
390 {
391         pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
392         return pte;
393 }
394 
395 static inline pte_t pte_mkold(pte_t pte)
396 {
397         pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
398         return pte;
399 }
400 
401 static inline pte_t pte_mkwrite(pte_t pte)
402 {
403         pte_val(pte) |= _PAGE_WRITE;
404         if (pte_val(pte) & _PAGE_MODIFIED)
405                 pte_val(pte) |= _PAGE_SILENT_WRITE;
406         return pte;
407 }
408 
409 static inline pte_t pte_mkdirty(pte_t pte)
410 {
411         pte_val(pte) |= _PAGE_MODIFIED;
412         if (pte_val(pte) & _PAGE_WRITE)
413                 pte_val(pte) |= _PAGE_SILENT_WRITE;
414         return pte;
415 }
416 
417 static inline pte_t pte_mkyoung(pte_t pte)
418 {
419         pte_val(pte) |= _PAGE_ACCESSED;
420         if (!(pte_val(pte) & _PAGE_NO_READ))
421                 pte_val(pte) |= _PAGE_SILENT_READ;
422         return pte;
423 }
424 
425 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
426 static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
427 
428 static inline pte_t pte_mkhuge(pte_t pte)
429 {
430         pte_val(pte) |= _PAGE_HUGE;
431         return pte;
432 }
433 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
434 #endif
435 static inline int pte_special(pte_t pte)        { return 0; }
436 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
437 
438 /*
439  * Macro to make mark a page protection value as "uncacheable".  Note
440  * that "protection" is really a misnomer here as the protection value
441  * contains the memory attribute bits, dirty bits, and various other
442  * bits as well.
443  */
444 #define pgprot_noncached pgprot_noncached
445 
446 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
447 {
448         unsigned long prot = pgprot_val(_prot);
449 
450         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
451 
452         return __pgprot(prot);
453 }
454 
455 #define pgprot_writecombine pgprot_writecombine
456 
457 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
458 {
459         unsigned long prot = pgprot_val(_prot);
460 
461         /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
462         prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
463 
464         return __pgprot(prot);
465 }
466 
467 /*
468  * Conversion functions: convert a page and protection to a page entry,
469  * and a page entry and page directory to the page they refer to.
470  */
471 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
472 
473 #if defined(CONFIG_XPA)
474 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
475 {
476         pte.pte_low  &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
477         pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
478         pte.pte_low  |= pgprot_val(newprot) & ~_PFNX_MASK;
479         pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
480         return pte;
481 }
482 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
483 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
484 {
485         pte.pte_low  &= _PAGE_CHG_MASK;
486         pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
487         pte.pte_low  |= pgprot_val(newprot);
488         pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
489         return pte;
490 }
491 #else
492 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
493 {
494         return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
495                      (pgprot_val(newprot) & ~_PAGE_CHG_MASK));
496 }
497 #endif
498 
499 
500 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
501         pte_t pte);
502 
503 static inline void update_mmu_cache(struct vm_area_struct *vma,
504         unsigned long address, pte_t *ptep)
505 {
506         pte_t pte = *ptep;
507         __update_tlb(vma, address, pte);
508 }
509 
510 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
511         unsigned long address, pmd_t *pmdp)
512 {
513         pte_t pte = *(pte_t *)pmdp;
514 
515         __update_tlb(vma, address, pte);
516 }
517 
518 #define kern_addr_valid(addr)   (1)
519 
520 #ifdef CONFIG_PHYS_ADDR_T_64BIT
521 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
522 
523 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
524                 unsigned long vaddr,
525                 unsigned long pfn,
526                 unsigned long size,
527                 pgprot_t prot)
528 {
529         phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
530         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
531 }
532 #define io_remap_pfn_range io_remap_pfn_range
533 #endif
534 
535 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
536 
537 #define has_transparent_hugepage has_transparent_hugepage
538 extern int has_transparent_hugepage(void);
539 
540 static inline int pmd_trans_huge(pmd_t pmd)
541 {
542         return !!(pmd_val(pmd) & _PAGE_HUGE);
543 }
544 
545 static inline pmd_t pmd_mkhuge(pmd_t pmd)
546 {
547         pmd_val(pmd) |= _PAGE_HUGE;
548 
549         return pmd;
550 }
551 
552 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
553                        pmd_t *pmdp, pmd_t pmd);
554 
555 #define __HAVE_ARCH_PMD_WRITE
556 static inline int pmd_write(pmd_t pmd)
557 {
558         return !!(pmd_val(pmd) & _PAGE_WRITE);
559 }
560 
561 static inline pmd_t pmd_wrprotect(pmd_t pmd)
562 {
563         pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
564         return pmd;
565 }
566 
567 static inline pmd_t pmd_mkwrite(pmd_t pmd)
568 {
569         pmd_val(pmd) |= _PAGE_WRITE;
570         if (pmd_val(pmd) & _PAGE_MODIFIED)
571                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
572 
573         return pmd;
574 }
575 
576 static inline int pmd_dirty(pmd_t pmd)
577 {
578         return !!(pmd_val(pmd) & _PAGE_MODIFIED);
579 }
580 
581 static inline pmd_t pmd_mkclean(pmd_t pmd)
582 {
583         pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
584         return pmd;
585 }
586 
587 static inline pmd_t pmd_mkdirty(pmd_t pmd)
588 {
589         pmd_val(pmd) |= _PAGE_MODIFIED;
590         if (pmd_val(pmd) & _PAGE_WRITE)
591                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
592 
593         return pmd;
594 }
595 
596 static inline int pmd_young(pmd_t pmd)
597 {
598         return !!(pmd_val(pmd) & _PAGE_ACCESSED);
599 }
600 
601 static inline pmd_t pmd_mkold(pmd_t pmd)
602 {
603         pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
604 
605         return pmd;
606 }
607 
608 static inline pmd_t pmd_mkyoung(pmd_t pmd)
609 {
610         pmd_val(pmd) |= _PAGE_ACCESSED;
611 
612         if (!(pmd_val(pmd) & _PAGE_NO_READ))
613                 pmd_val(pmd) |= _PAGE_SILENT_READ;
614 
615         return pmd;
616 }
617 
618 /* Extern to avoid header file madness */
619 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
620 
621 static inline unsigned long pmd_pfn(pmd_t pmd)
622 {
623         return pmd_val(pmd) >> _PFN_SHIFT;
624 }
625 
626 static inline struct page *pmd_page(pmd_t pmd)
627 {
628         if (pmd_trans_huge(pmd))
629                 return pfn_to_page(pmd_pfn(pmd));
630 
631         return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
632 }
633 
634 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
635 {
636         pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) |
637                        (pgprot_val(newprot) & ~_PAGE_CHG_MASK);
638         return pmd;
639 }
640 
641 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
642 {
643         pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
644 
645         return pmd;
646 }
647 
648 /*
649  * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
650  * different prototype.
651  */
652 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
653 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
654                                             unsigned long address, pmd_t *pmdp)
655 {
656         pmd_t old = *pmdp;
657 
658         pmd_clear(pmdp);
659 
660         return old;
661 }
662 
663 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
664 
665 #include <asm-generic/pgtable.h>
666 
667 /*
668  * uncached accelerated TLB map for video memory access
669  */
670 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
671 #define __HAVE_PHYS_MEM_ACCESS_PROT
672 
673 struct file;
674 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
675                 unsigned long size, pgprot_t vma_prot);
676 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
677                 unsigned long size, pgprot_t *vma_prot);
678 #endif
679 
680 /*
681  * We provide our own get_unmapped area to cope with the virtual aliasing
682  * constraints placed on us by the cache architecture.
683  */
684 #define HAVE_ARCH_UNMAPPED_AREA
685 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
686 
687 /*
688  * No page table caches to initialise
689  */
690 #define pgtable_cache_init()    do { } while (0)
691 
692 #endif /* _ASM_PGTABLE_H */
693 

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