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_free_pgd_range(struct mmu_gather *tlb,
  42                                           unsigned long addr,
  43                                           unsigned long end,
  44                                           unsigned long floor,
  45                                           unsigned long ceiling)
  46 {
  47         free_pgd_range(tlb, addr, end, floor, ceiling);
  48 }
  49
  50 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  51                                    pte_t *ptep, pte_t pte)
  52 {
  53         set_pte_at(mm, addr, ptep, pte);
  54 }
  55
  56 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  57                                             unsigned long addr, pte_t *ptep)
  58 {
  59         pte_t clear;
  60         pte_t pte = *ptep;
  61
  62         pte_val(clear) = (unsigned long)invalid_pte_table;
  63         set_pte_at(mm, addr, ptep, clear);
  64         return pte;
  65 }
  66
  67 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  68                                          unsigned long addr, pte_t *ptep)
  69 {
  70         /*
  71          * clear the huge pte entry firstly, so that the other smp threads will
  72          * not get old pte entry after finishing flush_tlb_page and before
  73          * setting new huge pte entry
  74          */
  75         huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
  76         flush_tlb_page(vma, addr);
  77 }
  78
  79 static inline int huge_pte_none(pte_t pte)
  80 {
  81         unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
  82         return !val || (val == (unsigned long)invalid_pte_table);
  83 }
  84
  85 static inline pte_t huge_pte_wrprotect(pte_t pte)
  86 {
  87         return pte_wrprotect(pte);
  88 }
  89
  90 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
  91                                            unsigned long addr, pte_t *ptep)
  92 {
  93         ptep_set_wrprotect(mm, addr, ptep);
  94 }
  95
  96 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  97                                              unsigned long addr,
  98                                              pte_t *ptep, pte_t pte,
  99                                              int dirty)
 100 {
 101         int changed = !pte_same(*ptep, pte);
 102
 103         if (changed) {
 104                 set_pte_at(vma->vm_mm, addr, ptep, pte);
 105                 /*
 106                  * There could be some standard sized pages in there,
 107                  * get them all.
 108                  */
 109                 flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
 110         }
 111         return changed;
 112 }
 113
 114 static inline pte_t huge_ptep_get(pte_t *ptep)
 115 {
 116         return *ptep;
 117 }
 118
 119 static inline void arch_clear_hugepage_flags(struct page *page)
 120 {
 121 }
 122
 123 #endif /* __ASM_HUGETLB_H */