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50a41ff2 DD |
1 | /* |
2 | * MIPS Huge TLB Page Support for Kernel. | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive | |
6 | * for more details. | |
7 | * | |
8 | * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com> | |
9 | * Copyright 2005, Embedded Alley Solutions, Inc. | |
10 | * Matt Porter <mporter@embeddedalley.com> | |
11 | * Copyright (C) 2008, 2009 Cavium Networks, Inc. | |
12 | */ | |
13 | ||
50a41ff2 DD |
14 | #include <linux/fs.h> |
15 | #include <linux/mm.h> | |
16 | #include <linux/hugetlb.h> | |
17 | #include <linux/pagemap.h> | |
50a41ff2 DD |
18 | #include <linux/err.h> |
19 | #include <linux/sysctl.h> | |
20 | #include <asm/mman.h> | |
21 | #include <asm/tlb.h> | |
22 | #include <asm/tlbflush.h> | |
23 | ||
24 | pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, | |
25 | unsigned long sz) | |
26 | { | |
27 | pgd_t *pgd; | |
28 | pud_t *pud; | |
29 | pte_t *pte = NULL; | |
30 | ||
31 | pgd = pgd_offset(mm, addr); | |
32 | pud = pud_alloc(mm, pgd, addr); | |
33 | if (pud) | |
34 | pte = (pte_t *)pmd_alloc(mm, pud, addr); | |
35 | ||
36 | return pte; | |
37 | } | |
38 | ||
39 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) | |
40 | { | |
41 | pgd_t *pgd; | |
42 | pud_t *pud; | |
43 | pmd_t *pmd = NULL; | |
44 | ||
45 | pgd = pgd_offset(mm, addr); | |
46 | if (pgd_present(*pgd)) { | |
47 | pud = pud_offset(pgd, addr); | |
48 | if (pud_present(*pud)) | |
49 | pmd = pmd_offset(pud, addr); | |
50 | } | |
51 | return (pte_t *) pmd; | |
52 | } | |
53 | ||
54 | int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) | |
55 | { | |
56 | return 0; | |
57 | } | |
58 | ||
59 | /* | |
60 | * This function checks for proper alignment of input addr and len parameters. | |
61 | */ | |
62 | int is_aligned_hugepage_range(unsigned long addr, unsigned long len) | |
63 | { | |
64 | if (len & ~HPAGE_MASK) | |
65 | return -EINVAL; | |
66 | if (addr & ~HPAGE_MASK) | |
67 | return -EINVAL; | |
68 | return 0; | |
69 | } | |
70 | ||
71 | struct page * | |
72 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) | |
73 | { | |
74 | return ERR_PTR(-EINVAL); | |
75 | } | |
76 | ||
77 | int pmd_huge(pmd_t pmd) | |
78 | { | |
79 | return (pmd_val(pmd) & _PAGE_HUGE) != 0; | |
80 | } | |
81 | ||
82 | int pud_huge(pud_t pud) | |
83 | { | |
84 | return (pud_val(pud) & _PAGE_HUGE) != 0; | |
85 | } | |
86 | ||
83467efb NH |
87 | int pmd_huge_support(void) |
88 | { | |
89 | return 1; | |
90 | } | |
91 | ||
50a41ff2 DD |
92 | struct page * |
93 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, | |
94 | pmd_t *pmd, int write) | |
95 | { | |
96 | struct page *page; | |
97 | ||
98 | page = pte_page(*(pte_t *)pmd); | |
99 | if (page) | |
100 | page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT); | |
101 | return page; | |
102 | } |