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