Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * arch/sh/mm/hugetlbpage.c | |
3 | * | |
4 | * SuperH HugeTLB page support. | |
5 | * | |
6 | * Cloned from sparc64 by Paul Mundt. | |
7 | * | |
8 | * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com) | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/init.h> |
12 | #include <linux/fs.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/hugetlb.h> | |
15 | #include <linux/pagemap.h> | |
16 | #include <linux/smp_lock.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/sysctl.h> | |
19 | ||
20 | #include <asm/mman.h> | |
21 | #include <asm/pgalloc.h> | |
22 | #include <asm/tlb.h> | |
23 | #include <asm/tlbflush.h> | |
24 | #include <asm/cacheflush.h> | |
25 | ||
63551ae0 | 26 | pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr) |
1da177e4 LT |
27 | { |
28 | pgd_t *pgd; | |
29 | pmd_t *pmd; | |
30 | pte_t *pte = NULL; | |
31 | ||
32 | pgd = pgd_offset(mm, addr); | |
33 | if (pgd) { | |
34 | pmd = pmd_alloc(mm, pgd, addr); | |
35 | if (pmd) | |
36 | pte = pte_alloc_map(mm, pmd, addr); | |
37 | } | |
38 | return pte; | |
39 | } | |
40 | ||
63551ae0 | 41 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) |
1da177e4 LT |
42 | { |
43 | pgd_t *pgd; | |
44 | pmd_t *pmd; | |
45 | pte_t *pte = NULL; | |
46 | ||
47 | pgd = pgd_offset(mm, addr); | |
48 | if (pgd) { | |
49 | pmd = pmd_offset(pgd, addr); | |
50 | if (pmd) | |
51 | pte = pte_offset_map(pmd, addr); | |
52 | } | |
53 | return pte; | |
54 | } | |
55 | ||
63551ae0 DG |
56 | void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, |
57 | pte_t *ptep, pte_t entry) | |
1da177e4 | 58 | { |
63551ae0 | 59 | int i; |
1da177e4 | 60 | |
63551ae0 DG |
61 | for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) { |
62 | set_pte_at(mm, addr, ptep, entry); | |
63 | ptep++; | |
64 | addr += PAGE_SIZE; | |
65 | pte_val(entry) += PAGE_SIZE; | |
66 | } | |
67 | } | |
1da177e4 | 68 | |
63551ae0 DG |
69 | pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, |
70 | pte_t *ptep) | |
71 | { | |
72 | pte_t entry; | |
73 | int i; | |
1da177e4 | 74 | |
63551ae0 | 75 | entry = *ptep; |
1da177e4 | 76 | |
63551ae0 DG |
77 | for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) { |
78 | pte_clear(mm, addr, ptep); | |
79 | addr += PAGE_SIZE; | |
80 | ptep++; | |
1da177e4 | 81 | } |
63551ae0 DG |
82 | |
83 | return entry; | |
1da177e4 LT |
84 | } |
85 | ||
1da177e4 LT |
86 | struct page *follow_huge_addr(struct mm_struct *mm, |
87 | unsigned long address, int write) | |
88 | { | |
89 | return ERR_PTR(-EINVAL); | |
90 | } | |
91 | ||
92 | int pmd_huge(pmd_t pmd) | |
93 | { | |
94 | return 0; | |
95 | } | |
96 | ||
97 | struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, | |
98 | pmd_t *pmd, int write) | |
99 | { | |
100 | return NULL; | |
101 | } |