arch/tile/include/asm/hugetlb.h

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #ifndef _ASM_TILE_HUGETLB_H
  16 #define _ASM_TILE_HUGETLB_H
  17
  18 #include <asm/page.h>
  19 #include <asm-generic/hugetlb.h>
  20
  21
  22 static inline int is_hugepage_only_range(struct mm_struct *mm,
  23                                          unsigned long addr,
  24                                          unsigned long len) {
  25         return 0;
  26 }
  27
  28 /*
  29  * If the arch doesn't supply something else, assume that hugepage
  30  * size aligned regions are ok without further preparation.
  31  */
  32 static inline int prepare_hugepage_range(struct file *file,
  33                                          unsigned long addr, unsigned long len)
  34 {
  35         struct hstate *h = hstate_file(file);
  36         if (len & ~huge_page_mask(h))
  37                 return -EINVAL;
  38         if (addr & ~huge_page_mask(h))
  39                 return -EINVAL;
  40         return 0;
  41 }
  42
  43 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
  44                                           unsigned long addr, unsigned long end,
  45                                           unsigned long floor,
  46                                           unsigned long ceiling)
  47 {
  48         free_pgd_range(tlb, addr, end, floor, ceiling);
  49 }
  50
  51 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  52                                    pte_t *ptep, pte_t pte)
  53 {
  54         set_pte(ptep, pte);
  55 }
  56
  57 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  58                                             unsigned long addr, pte_t *ptep)
  59 {
  60         return ptep_get_and_clear(mm, addr, ptep);
  61 }
  62
  63 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  64                                          unsigned long addr, pte_t *ptep)
  65 {
  66         ptep_clear_flush(vma, addr, ptep);
  67 }
  68
  69 static inline int huge_pte_none(pte_t pte)
  70 {
  71         return pte_none(pte);
  72 }
  73
  74 static inline pte_t huge_pte_wrprotect(pte_t pte)
  75 {
  76         return pte_wrprotect(pte);
  77 }
  78
  79 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
  80                                            unsigned long addr, pte_t *ptep)
  81 {
  82         ptep_set_wrprotect(mm, addr, ptep);
  83 }
  84
  85 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  86                                              unsigned long addr, pte_t *ptep,
  87                                              pte_t pte, int dirty)
  88 {
  89         return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
  90 }
  91
  92 static inline pte_t huge_ptep_get(pte_t *ptep)
  93 {
  94         return *ptep;
  95 }
  96
  97 static inline void arch_clear_hugepage_flags(struct page *page)
  98 {
  99 }
 100
 101 #ifdef CONFIG_HUGETLB_SUPER_PAGES
 102 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 103                                        struct page *page, int writable)
 104 {
 105         size_t pagesize = huge_page_size(hstate_vma(vma));
 106         if (pagesize != PUD_SIZE && pagesize != PMD_SIZE)
 107                 entry = pte_mksuper(entry);
 108         return entry;
 109 }
 110 #define arch_make_huge_pte arch_make_huge_pte
 111
 112 /* Sizes to scale up page size for PTEs with HV_PTE_SUPER bit. */
 113 enum {
 114         HUGE_SHIFT_PGDIR = 0,
 115         HUGE_SHIFT_PMD = 1,
 116         HUGE_SHIFT_PAGE = 2,
 117         HUGE_SHIFT_ENTRIES
 118 };
 119 extern int huge_shift[HUGE_SHIFT_ENTRIES];
 120 #endif
 121
 122 #endif /* _ASM_TILE_HUGETLB_H */