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