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 #define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
15 static inline int prepare_hugepage_range(struct file *file,
16 unsigned long addr,
17 unsigned long len)
18 {
19 unsigned long task_size = STACK_TOP;
20 struct hstate *h = hstate_file(file);
21
22 if (len & ~huge_page_mask(h))
23 return -EINVAL;
24 if (addr & ~huge_page_mask(h))
25 return -EINVAL;
26 if (len > task_size)
27 return -ENOMEM;
28 if (task_size - len < addr)
29 return -EINVAL;
30 return 0;
31 }
32
33 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
34 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
35 unsigned long addr, pte_t *ptep)
36 {
37 pte_t clear;
38 pte_t pte = *ptep;
39
40 pte_val(clear) = (unsigned long)invalid_pte_table;
41 set_pte_at(mm, addr, ptep, clear);
42 return pte;
43 }
44
45 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
46 static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
47 unsigned long addr, pte_t *ptep)
48 {
49 pte_t pte;
50
51 /*
52 * clear the huge pte entry firstly, so that the other smp threads will
53 * not get old pte entry after finishing flush_tlb_page and before
54 * setting new huge pte entry
55 */
56 pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
57 flush_tlb_page(vma, addr);
58 return pte;
59 }
60
61 #define __HAVE_ARCH_HUGE_PTE_NONE
62 static inline int huge_pte_none(pte_t pte)
63 {
64 unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
65 return !val || (val == (unsigned long)invalid_pte_table);
66 }
67
68 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
69 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
70 unsigned long addr,
71 pte_t *ptep, pte_t pte,
72 int dirty)
73 {
74 int changed = !pte_same(*ptep, pte);
75
76 if (changed) {
77 set_pte_at(vma->vm_mm, addr, ptep, pte);
78 /*
79 * There could be some standard sized pages in there,
80 * get them all.
81 */
82 flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
83 }
84 return changed;
85 }
86
87 #include <asm-generic/hugetlb.h>
88
89 #endif /* __ASM_HUGETLB_H */
90
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.