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hugetlb.h
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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 */
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