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

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