diff options
author | David Daney <ddaney@caviumnetworks.com> | 2009-05-27 20:47:42 -0400 |
---|---|---|
committer | Ralf Baechle <ralf@linux-mips.org> | 2009-06-17 06:06:30 -0400 |
commit | 50a41ff292fafe1e937102be23464b54fed8b78c (patch) | |
tree | ef4a650765ce979d217dcb09a829ea44e595b646 /arch/mips/mm/hugetlbpage.c | |
parent | bd1437e49d80fa3369ffbea9e73cde7f6d69e550 (diff) |
MIPS: Add support files for hugetlbfs.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mm/hugetlbpage.c')
-rw-r--r-- | arch/mips/mm/hugetlbpage.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/arch/mips/mm/hugetlbpage.c b/arch/mips/mm/hugetlbpage.c new file mode 100644 index 000000000000..471c09aa1614 --- /dev/null +++ b/arch/mips/mm/hugetlbpage.c | |||
@@ -0,0 +1,101 @@ | |||
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 | |||
14 | #include <linux/init.h> | ||
15 | #include <linux/fs.h> | ||
16 | #include <linux/mm.h> | ||
17 | #include <linux/hugetlb.h> | ||
18 | #include <linux/pagemap.h> | ||
19 | #include <linux/smp_lock.h> | ||
20 | #include <linux/slab.h> | ||
21 | #include <linux/err.h> | ||
22 | #include <linux/sysctl.h> | ||
23 | #include <asm/mman.h> | ||
24 | #include <asm/tlb.h> | ||
25 | #include <asm/tlbflush.h> | ||
26 | |||
27 | pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, | ||
28 | unsigned long sz) | ||
29 | { | ||
30 | pgd_t *pgd; | ||
31 | pud_t *pud; | ||
32 | pte_t *pte = NULL; | ||
33 | |||
34 | pgd = pgd_offset(mm, addr); | ||
35 | pud = pud_alloc(mm, pgd, addr); | ||
36 | if (pud) | ||
37 | pte = (pte_t *)pmd_alloc(mm, pud, addr); | ||
38 | |||
39 | return pte; | ||
40 | } | ||
41 | |||
42 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) | ||
43 | { | ||
44 | pgd_t *pgd; | ||
45 | pud_t *pud; | ||
46 | pmd_t *pmd = NULL; | ||
47 | |||
48 | pgd = pgd_offset(mm, addr); | ||
49 | if (pgd_present(*pgd)) { | ||
50 | pud = pud_offset(pgd, addr); | ||
51 | if (pud_present(*pud)) | ||
52 | pmd = pmd_offset(pud, addr); | ||
53 | } | ||
54 | return (pte_t *) pmd; | ||
55 | } | ||
56 | |||
57 | int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) | ||
58 | { | ||
59 | return 0; | ||
60 | } | ||
61 | |||
62 | /* | ||
63 | * This function checks for proper alignment of input addr and len parameters. | ||
64 | */ | ||
65 | int is_aligned_hugepage_range(unsigned long addr, unsigned long len) | ||
66 | { | ||
67 | if (len & ~HPAGE_MASK) | ||
68 | return -EINVAL; | ||
69 | if (addr & ~HPAGE_MASK) | ||
70 | return -EINVAL; | ||
71 | return 0; | ||
72 | } | ||
73 | |||
74 | struct page * | ||
75 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) | ||
76 | { | ||
77 | return ERR_PTR(-EINVAL); | ||
78 | } | ||
79 | |||
80 | int pmd_huge(pmd_t pmd) | ||
81 | { | ||
82 | return (pmd_val(pmd) & _PAGE_HUGE) != 0; | ||
83 | } | ||
84 | |||
85 | int pud_huge(pud_t pud) | ||
86 | { | ||
87 | return (pud_val(pud) & _PAGE_HUGE) != 0; | ||
88 | } | ||
89 | |||
90 | struct page * | ||
91 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, | ||
92 | pmd_t *pmd, int write) | ||
93 | { | ||
94 | struct page *page; | ||
95 | |||
96 | page = pte_page(*(pte_t *)pmd); | ||
97 | if (page) | ||
98 | page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT); | ||
99 | return page; | ||
100 | } | ||
101 | |||