Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

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 | _PAGE_READ | \
 28                                  _page_cachable_default)
 29 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_NO_EXEC | \
 30                                  _page_cachable_default)
 31 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _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 | _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 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
131 
132 #define pte_none(pte)           (!(((pte).pte_high) & ~_PAGE_GLOBAL))
133 #define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
134 
135 static inline void set_pte(pte_t *ptep, pte_t pte)
136 {
137         ptep->pte_high = pte.pte_high;
138         smp_wmb();
139         ptep->pte_low = pte.pte_low;
140 
141         if (pte.pte_high & _PAGE_GLOBAL) {
142                 pte_t *buddy = ptep_buddy(ptep);
143                 /*
144                  * Make sure the buddy is global too (if it's !none,
145                  * it better already be global)
146                  */
147                 if (pte_none(*buddy))
148                         buddy->pte_high |= _PAGE_GLOBAL;
149         }
150 }
151 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
152 
153 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
154 {
155         pte_t null = __pte(0);
156 
157         htw_stop();
158         /* Preserve global status for the pair */
159         if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
160                 null.pte_high = _PAGE_GLOBAL;
161 
162         set_pte_at(mm, addr, ptep, null);
163         htw_start();
164 }
165 #else
166 
167 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
168 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
169 
170 /*
171  * Certain architectures need to do special things when pte's
172  * within a page table are directly modified.  Thus, the following
173  * hook is made available.
174  */
175 static inline void set_pte(pte_t *ptep, pte_t pteval)
176 {
177         *ptep = pteval;
178 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
179         if (pte_val(pteval) & _PAGE_GLOBAL) {
180                 pte_t *buddy = ptep_buddy(ptep);
181                 /*
182                  * Make sure the buddy is global too (if it's !none,
183                  * it better already be global)
184                  */
185 #ifdef CONFIG_SMP
186                 /*
187                  * For SMP, multiple CPUs can race, so we need to do
188                  * this atomically.
189                  */
190 #ifdef CONFIG_64BIT
191 #define LL_INSN "lld"
192 #define SC_INSN "scd"
193 #else /* CONFIG_32BIT */
194 #define LL_INSN "ll"
195 #define SC_INSN "sc"
196 #endif
197                 unsigned long page_global = _PAGE_GLOBAL;
198                 unsigned long tmp;
199 
200                 __asm__ __volatile__ (
201                         "       .set    push\n"
202                         "       .set    noreorder\n"
203                         "1:     " LL_INSN "     %[tmp], %[buddy]\n"
204                         "       bnez    %[tmp], 2f\n"
205                         "        or     %[tmp], %[tmp], %[global]\n"
206                         "       " SC_INSN "     %[tmp], %[buddy]\n"
207                         "       beqz    %[tmp], 1b\n"
208                         "        nop\n"
209                         "2:\n"
210                         "       .set pop"
211                         : [buddy] "+m" (buddy->pte),
212                           [tmp] "=&r" (tmp)
213                         : [global] "r" (page_global));
214 #else /* !CONFIG_SMP */
215                 if (pte_none(*buddy))
216                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
217 #endif /* CONFIG_SMP */
218         }
219 #endif
220 }
221 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
222 
223 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
224 {
225         htw_stop();
226 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
227         /* Preserve global status for the pair */
228         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
229                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
230         else
231 #endif
232                 set_pte_at(mm, addr, ptep, __pte(0));
233         htw_start();
234 }
235 #endif
236 
237 /*
238  * (pmds are folded into puds so this doesn't get actually called,
239  * but the define is needed for a generic inline function.)
240  */
241 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
242 
243 #ifndef __PAGETABLE_PMD_FOLDED
244 /*
245  * (puds are folded into pgds so this doesn't get actually called,
246  * but the define is needed for a generic inline function.)
247  */
248 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
249 #endif
250 
251 #define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
252 #define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
253 #define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
254 
255 /*
256  * We used to declare this array with size but gcc 3.3 and older are not able
257  * to find that this expression is a constant, so the size is dropped.
258  */
259 extern pgd_t swapper_pg_dir[];
260 
261 /*
262  * The following only work if pte_present() is true.
263  * Undefined behaviour if not..
264  */
265 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
266 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
267 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
268 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
269 
270 static inline pte_t pte_wrprotect(pte_t pte)
271 {
272         pte.pte_low  &= ~_PAGE_WRITE;
273         pte.pte_high &= ~_PAGE_SILENT_WRITE;
274         return pte;
275 }
276 
277 static inline pte_t pte_mkclean(pte_t pte)
278 {
279         pte.pte_low  &= ~_PAGE_MODIFIED;
280         pte.pte_high &= ~_PAGE_SILENT_WRITE;
281         return pte;
282 }
283 
284 static inline pte_t pte_mkold(pte_t pte)
285 {
286         pte.pte_low  &= ~_PAGE_ACCESSED;
287         pte.pte_high &= ~_PAGE_SILENT_READ;
288         return pte;
289 }
290 
291 static inline pte_t pte_mkwrite(pte_t pte)
292 {
293         pte.pte_low |= _PAGE_WRITE;
294         if (pte.pte_low & _PAGE_MODIFIED)
295                 pte.pte_high |= _PAGE_SILENT_WRITE;
296         return pte;
297 }
298 
299 static inline pte_t pte_mkdirty(pte_t pte)
300 {
301         pte.pte_low |= _PAGE_MODIFIED;
302         if (pte.pte_low & _PAGE_WRITE)
303                 pte.pte_high |= _PAGE_SILENT_WRITE;
304         return pte;
305 }
306 
307 static inline pte_t pte_mkyoung(pte_t pte)
308 {
309         pte.pte_low |= _PAGE_ACCESSED;
310         if (pte.pte_low & _PAGE_READ)
311                 pte.pte_high |= _PAGE_SILENT_READ;
312         return pte;
313 }
314 #else
315 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
316 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
317 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
318 
319 static inline pte_t pte_wrprotect(pte_t pte)
320 {
321         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
322         return pte;
323 }
324 
325 static inline pte_t pte_mkclean(pte_t pte)
326 {
327         pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
328         return pte;
329 }
330 
331 static inline pte_t pte_mkold(pte_t pte)
332 {
333         pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
334         return pte;
335 }
336 
337 static inline pte_t pte_mkwrite(pte_t pte)
338 {
339         pte_val(pte) |= _PAGE_WRITE;
340         if (pte_val(pte) & _PAGE_MODIFIED)
341                 pte_val(pte) |= _PAGE_SILENT_WRITE;
342         return pte;
343 }
344 
345 static inline pte_t pte_mkdirty(pte_t pte)
346 {
347         pte_val(pte) |= _PAGE_MODIFIED;
348         if (pte_val(pte) & _PAGE_WRITE)
349                 pte_val(pte) |= _PAGE_SILENT_WRITE;
350         return pte;
351 }
352 
353 static inline pte_t pte_mkyoung(pte_t pte)
354 {
355         pte_val(pte) |= _PAGE_ACCESSED;
356 #ifdef CONFIG_CPU_MIPSR2
357         if (!(pte_val(pte) & _PAGE_NO_READ))
358                 pte_val(pte) |= _PAGE_SILENT_READ;
359         else
360 #endif
361         if (pte_val(pte) & _PAGE_READ)
362                 pte_val(pte) |= _PAGE_SILENT_READ;
363         return pte;
364 }
365 
366 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
367 static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
368 
369 static inline pte_t pte_mkhuge(pte_t pte)
370 {
371         pte_val(pte) |= _PAGE_HUGE;
372         return pte;
373 }
374 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
375 #endif
376 static inline int pte_special(pte_t pte)        { return 0; }
377 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
378 
379 /*
380  * Macro to make mark a page protection value as "uncacheable".  Note
381  * that "protection" is really a misnomer here as the protection value
382  * contains the memory attribute bits, dirty bits, and various other
383  * bits as well.
384  */
385 #define pgprot_noncached pgprot_noncached
386 
387 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
388 {
389         unsigned long prot = pgprot_val(_prot);
390 
391         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
392 
393         return __pgprot(prot);
394 }
395 
396 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
397 {
398         unsigned long prot = pgprot_val(_prot);
399 
400         /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
401         prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
402 
403         return __pgprot(prot);
404 }
405 
406 /*
407  * Conversion functions: convert a page and protection to a page entry,
408  * and a page entry and page directory to the page they refer to.
409  */
410 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
411 
412 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
413 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
414 {
415         pte.pte_low  &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
416         pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
417         pte.pte_low  |= pgprot_val(newprot) & ~_PFNX_MASK;
418         pte.pte_high |= pgprot_val(newprot) & ~_PFN_MASK;
419         return pte;
420 }
421 #else
422 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
423 {
424         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
425 }
426 #endif
427 
428 
429 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
430         pte_t pte);
431 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
432         pte_t pte);
433 
434 static inline void update_mmu_cache(struct vm_area_struct *vma,
435         unsigned long address, pte_t *ptep)
436 {
437         pte_t pte = *ptep;
438         __update_tlb(vma, address, pte);
439         __update_cache(vma, address, pte);
440 }
441 
442 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
443         unsigned long address, pmd_t *pmdp)
444 {
445         pte_t pte = *(pte_t *)pmdp;
446 
447         __update_tlb(vma, address, pte);
448 }
449 
450 #define kern_addr_valid(addr)   (1)
451 
452 #ifdef CONFIG_PHYS_ADDR_T_64BIT
453 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
454 
455 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
456                 unsigned long vaddr,
457                 unsigned long pfn,
458                 unsigned long size,
459                 pgprot_t prot)
460 {
461         phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
462         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
463 }
464 #define io_remap_pfn_range io_remap_pfn_range
465 #endif
466 
467 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
468 
469 extern int has_transparent_hugepage(void);
470 
471 static inline int pmd_trans_huge(pmd_t pmd)
472 {
473         return !!(pmd_val(pmd) & _PAGE_HUGE);
474 }
475 
476 static inline pmd_t pmd_mkhuge(pmd_t pmd)
477 {
478         pmd_val(pmd) |= _PAGE_HUGE;
479 
480         return pmd;
481 }
482 
483 static inline int pmd_trans_splitting(pmd_t pmd)
484 {
485         return !!(pmd_val(pmd) & _PAGE_SPLITTING);
486 }
487 
488 static inline pmd_t pmd_mksplitting(pmd_t pmd)
489 {
490         pmd_val(pmd) |= _PAGE_SPLITTING;
491 
492         return pmd;
493 }
494 
495 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
496                        pmd_t *pmdp, pmd_t pmd);
497 
498 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
499 /* Extern to avoid header file madness */
500 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
501                                         unsigned long address,
502                                         pmd_t *pmdp);
503 
504 #define __HAVE_ARCH_PMD_WRITE
505 static inline int pmd_write(pmd_t pmd)
506 {
507         return !!(pmd_val(pmd) & _PAGE_WRITE);
508 }
509 
510 static inline pmd_t pmd_wrprotect(pmd_t pmd)
511 {
512         pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
513         return pmd;
514 }
515 
516 static inline pmd_t pmd_mkwrite(pmd_t pmd)
517 {
518         pmd_val(pmd) |= _PAGE_WRITE;
519         if (pmd_val(pmd) & _PAGE_MODIFIED)
520                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
521 
522         return pmd;
523 }
524 
525 static inline int pmd_dirty(pmd_t pmd)
526 {
527         return !!(pmd_val(pmd) & _PAGE_MODIFIED);
528 }
529 
530 static inline pmd_t pmd_mkclean(pmd_t pmd)
531 {
532         pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
533         return pmd;
534 }
535 
536 static inline pmd_t pmd_mkdirty(pmd_t pmd)
537 {
538         pmd_val(pmd) |= _PAGE_MODIFIED;
539         if (pmd_val(pmd) & _PAGE_WRITE)
540                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
541 
542         return pmd;
543 }
544 
545 static inline int pmd_young(pmd_t pmd)
546 {
547         return !!(pmd_val(pmd) & _PAGE_ACCESSED);
548 }
549 
550 static inline pmd_t pmd_mkold(pmd_t pmd)
551 {
552         pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
553 
554         return pmd;
555 }
556 
557 static inline pmd_t pmd_mkyoung(pmd_t pmd)
558 {
559         pmd_val(pmd) |= _PAGE_ACCESSED;
560 
561 #ifdef CONFIG_CPU_MIPSR2
562         if (!(pmd_val(pmd) & _PAGE_NO_READ))
563                 pmd_val(pmd) |= _PAGE_SILENT_READ;
564         else
565 #endif
566         if (pmd_val(pmd) & _PAGE_READ)
567                 pmd_val(pmd) |= _PAGE_SILENT_READ;
568 
569         return pmd;
570 }
571 
572 /* Extern to avoid header file madness */
573 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
574 
575 static inline unsigned long pmd_pfn(pmd_t pmd)
576 {
577         return pmd_val(pmd) >> _PFN_SHIFT;
578 }
579 
580 static inline struct page *pmd_page(pmd_t pmd)
581 {
582         if (pmd_trans_huge(pmd))
583                 return pfn_to_page(pmd_pfn(pmd));
584 
585         return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
586 }
587 
588 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
589 {
590         pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot);
591         return pmd;
592 }
593 
594 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
595 {
596         pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
597 
598         return pmd;
599 }
600 
601 /*
602  * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
603  * different prototype.
604  */
605 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
606 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
607                                             unsigned long address, pmd_t *pmdp)
608 {
609         pmd_t old = *pmdp;
610 
611         pmd_clear(pmdp);
612 
613         return old;
614 }
615 
616 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
617 
618 #include <asm-generic/pgtable.h>
619 
620 /*
621  * uncached accelerated TLB map for video memory access
622  */
623 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
624 #define __HAVE_PHYS_MEM_ACCESS_PROT
625 
626 struct file;
627 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
628                 unsigned long size, pgprot_t vma_prot);
629 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
630                 unsigned long size, pgprot_t *vma_prot);
631 #endif
632 
633 /*
634  * We provide our own get_unmapped area to cope with the virtual aliasing
635  * constraints placed on us by the cache architecture.
636  */
637 #define HAVE_ARCH_UNMAPPED_AREA
638 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
639 
640 /*
641  * No page table caches to initialise
642  */
643 #define pgtable_cache_init()    do { } while (0)
644 
645 #endif /* _ASM_PGTABLE_H */
646 

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