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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 | ||
aec44e0f PX |
24 | pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma, |
25 | unsigned long addr, unsigned long sz) | |
50a41ff2 DD |
26 | { |
27 | pgd_t *pgd; | |
2bee1b58 | 28 | p4d_t *p4d; |
50a41ff2 DD |
29 | pud_t *pud; |
30 | pte_t *pte = NULL; | |
31 | ||
32 | pgd = pgd_offset(mm, addr); | |
2bee1b58 MR |
33 | p4d = p4d_alloc(mm, pgd, addr); |
34 | pud = pud_alloc(mm, p4d, addr); | |
50a41ff2 DD |
35 | if (pud) |
36 | pte = (pte_t *)pmd_alloc(mm, pud, addr); | |
37 | ||
38 | return pte; | |
39 | } | |
40 | ||
7868a208 PA |
41 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr, |
42 | unsigned long sz) | |
50a41ff2 DD |
43 | { |
44 | pgd_t *pgd; | |
2bee1b58 | 45 | p4d_t *p4d; |
50a41ff2 DD |
46 | pud_t *pud; |
47 | pmd_t *pmd = NULL; | |
48 | ||
49 | pgd = pgd_offset(mm, addr); | |
50 | if (pgd_present(*pgd)) { | |
2bee1b58 MR |
51 | p4d = p4d_offset(pgd, addr); |
52 | if (p4d_present(*p4d)) { | |
53 | pud = pud_offset(p4d, addr); | |
54 | if (pud_present(*pud)) | |
55 | pmd = pmd_offset(pud, addr); | |
56 | } | |
50a41ff2 DD |
57 | } |
58 | return (pte_t *) pmd; | |
59 | } |