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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 | ||
11 | #include <linux/config.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/mm.h> | |
15 | #include <linux/hugetlb.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/smp_lock.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/sysctl.h> | |
20 | ||
21 | #include <asm/mman.h> | |
22 | #include <asm/pgalloc.h> | |
23 | #include <asm/tlb.h> | |
24 | #include <asm/tlbflush.h> | |
25 | #include <asm/cacheflush.h> | |
26 | ||
63551ae0 | 27 | pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr) |
1da177e4 LT |
28 | { |
29 | pgd_t *pgd; | |
30 | pmd_t *pmd; | |
31 | pte_t *pte = NULL; | |
32 | ||
33 | pgd = pgd_offset(mm, addr); | |
34 | if (pgd) { | |
35 | pmd = pmd_alloc(mm, pgd, addr); | |
36 | if (pmd) | |
37 | pte = pte_alloc_map(mm, pmd, addr); | |
38 | } | |
39 | return pte; | |
40 | } | |
41 | ||
63551ae0 | 42 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) |
1da177e4 LT |
43 | { |
44 | pgd_t *pgd; | |
45 | pmd_t *pmd; | |
46 | pte_t *pte = NULL; | |
47 | ||
48 | pgd = pgd_offset(mm, addr); | |
49 | if (pgd) { | |
50 | pmd = pmd_offset(pgd, addr); | |
51 | if (pmd) | |
52 | pte = pte_offset_map(pmd, addr); | |
53 | } | |
54 | return pte; | |
55 | } | |
56 | ||
57 | #define mk_pte_huge(entry) do { pte_val(entry) |= _PAGE_SZHUGE; } while (0) | |
58 | ||
63551ae0 DG |
59 | void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, |
60 | pte_t *ptep, pte_t entry) | |
1da177e4 | 61 | { |
63551ae0 | 62 | int i; |
1da177e4 | 63 | |
63551ae0 DG |
64 | for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) { |
65 | set_pte_at(mm, addr, ptep, entry); | |
66 | ptep++; | |
67 | addr += PAGE_SIZE; | |
68 | pte_val(entry) += PAGE_SIZE; | |
69 | } | |
70 | } | |
1da177e4 | 71 | |
63551ae0 DG |
72 | pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, |
73 | pte_t *ptep) | |
74 | { | |
75 | pte_t entry; | |
76 | int i; | |
1da177e4 | 77 | |
63551ae0 | 78 | entry = *ptep; |
1da177e4 | 79 | |
63551ae0 DG |
80 | for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) { |
81 | pte_clear(mm, addr, ptep); | |
82 | addr += PAGE_SIZE; | |
83 | ptep++; | |
1da177e4 | 84 | } |
63551ae0 DG |
85 | |
86 | return entry; | |
1da177e4 LT |
87 | } |
88 | ||
89 | /* | |
90 | * This function checks for proper alignment of input addr and len parameters. | |
91 | */ | |
92 | int is_aligned_hugepage_range(unsigned long addr, unsigned long len) | |
93 | { | |
94 | if (len & ~HPAGE_MASK) | |
95 | return -EINVAL; | |
96 | if (addr & ~HPAGE_MASK) | |
97 | return -EINVAL; | |
98 | return 0; | |
99 | } | |
100 | ||
1da177e4 LT |
101 | struct page *follow_huge_addr(struct mm_struct *mm, |
102 | unsigned long address, int write) | |
103 | { | |
104 | return ERR_PTR(-EINVAL); | |
105 | } | |
106 | ||
107 | int pmd_huge(pmd_t pmd) | |
108 | { | |
109 | return 0; | |
110 | } | |
111 | ||
112 | struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, | |
113 | pmd_t *pmd, int write) | |
114 | { | |
115 | return NULL; | |
116 | } |