hugetlb: introduce generic version of huge_ptep_clear_flush
[muen/linux.git] / 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 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
40 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
41                                             unsigned long addr, pte_t *ptep)
42 {
43         pte_t clear;
44         pte_t pte = *ptep;
45
46         pte_val(clear) = (unsigned long)invalid_pte_table;
47         set_pte_at(mm, addr, ptep, clear);
48         return pte;
49 }
50
51 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
52 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
53                                          unsigned long addr, pte_t *ptep)
54 {
55         flush_tlb_page(vma, addr & huge_page_mask(hstate_vma(vma)));
56 }
57
58 static inline int huge_pte_none(pte_t pte)
59 {
60         unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
61         return !val || (val == (unsigned long)invalid_pte_table);
62 }
63
64 static inline pte_t huge_pte_wrprotect(pte_t pte)
65 {
66         return pte_wrprotect(pte);
67 }
68
69 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
70                                            unsigned long addr, pte_t *ptep)
71 {
72         ptep_set_wrprotect(mm, addr, ptep);
73 }
74
75 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
76                                              unsigned long addr,
77                                              pte_t *ptep, pte_t pte,
78                                              int dirty)
79 {
80         int changed = !pte_same(*ptep, pte);
81
82         if (changed) {
83                 set_pte_at(vma->vm_mm, addr, ptep, pte);
84                 /*
85                  * There could be some standard sized pages in there,
86                  * get them all.
87                  */
88                 flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
89         }
90         return changed;
91 }
92
93 static inline pte_t huge_ptep_get(pte_t *ptep)
94 {
95         return *ptep;
96 }
97
98 static inline void arch_clear_hugepage_flags(struct page *page)
99 {
100 }
101
102 #include <asm-generic/hugetlb.h>
103
104 #endif /* __ASM_HUGETLB_H */