arch/mips/include/asm/hugetlb.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) 2008, 2009 Cavium Networks, Inc.
   7  */
   8
   9 #ifndef __ASM_HUGETLB_H
  10 #define __ASM_HUGETLB_H
  11
  12 #include <asm/page.h>
  13
  14
  15 static inline int is_hugepage_only_range(struct mm_struct *mm,
  16                                          unsigned long addr,
  17                                          unsigned long len)
  18 {
  19         return 0;
  20 }
  21
  22 static inline int prepare_hugepage_range(struct file *file,
  23                                          unsigned long addr,
  24                                          unsigned long len)
  25 {
  26         unsigned long task_size = STACK_TOP;
  27         struct hstate *h = hstate_file(file);
  28
  29         if (len & ~huge_page_mask(h))
  30                 return -EINVAL;
  31         if (addr & ~huge_page_mask(h))
  32                 return -EINVAL;
  33         if (len > task_size)
  34                 return -ENOMEM;
  35         if (task_size - len < addr)
  36                 return -EINVAL;
  37         return 0;
  38 }
  39
  40 static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
  41 {
  42 }
  43
  44 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
  45                                           unsigned long addr,
  46                                           unsigned long end,
  47                                           unsigned long floor,
  48                                           unsigned long ceiling)
  49 {
  50         free_pgd_range(tlb, addr, end, floor, ceiling);
  51 }
  52
  53 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  54                                    pte_t *ptep, pte_t pte)
  55 {
  56         set_pte_at(mm, addr, ptep, pte);
  57 }
  58
  59 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  60                                             unsigned long addr, pte_t *ptep)
  61 {
  62         pte_t clear;
  63         pte_t pte = *ptep;
  64
  65         pte_val(clear) = (unsigned long)invalid_pte_table;
  66         set_pte_at(mm, addr, ptep, clear);
  67         return pte;
  68 }
  69
  70 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  71                                          unsigned long addr, pte_t *ptep)
  72 {
  73         flush_tlb_page(vma, addr & huge_page_mask(hstate_vma(vma)));
  74 }
  75
  76 static inline int huge_pte_none(pte_t pte)
  77 {
  78         unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
  79         return !val || (val == (unsigned long)invalid_pte_table);
  80 }
  81
  82 static inline pte_t huge_pte_wrprotect(pte_t pte)
  83 {
  84         return pte_wrprotect(pte);
  85 }
  86
  87 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
  88                                            unsigned long addr, pte_t *ptep)
  89 {
  90         ptep_set_wrprotect(mm, addr, ptep);
  91 }
  92
  93 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  94                                              unsigned long addr,
  95                                              pte_t *ptep, pte_t pte,
  96                                              int dirty)
  97 {
  98         int changed = !pte_same(*ptep, pte);
  99
 100         if (changed) {
 101                 set_pte_at(vma->vm_mm, addr, ptep, pte);
 102                 /*
 103                  * There could be some standard sized pages in there,
 104                  * get them all.
 105                  */
 106                 flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
 107         }
 108         return changed;
 109 }
 110
 111 static inline pte_t huge_ptep_get(pte_t *ptep)
 112 {
 113         return *ptep;
 114 }
 115
 116 static inline int arch_prepare_hugepage(struct page *page)
 117 {
 118         return 0;
 119 }
 120
 121 static inline void arch_release_hugepage(struct page *page)
 122 {
 123 }
 124
 125 static inline void arch_clear_hugepage_flags(struct page *page)
 126 {
 127 }
 128
 129 #endif /* __ASM_HUGETLB_H */