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/fs.h> |
15 | #include <linux/mm.h> |
16 | #include <linux/hugetlb.h> |
17 | #include <linux/pagemap.h> |
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, struct vm_area_struct *vma, |
25 | unsigned long addr, unsigned long sz) |
26 | { |
27 | pgd_t *pgd; |
28 | p4d_t *p4d; |
29 | pud_t *pud; |
30 | pte_t *pte = NULL; |
31 | |
32 | pgd = pgd_offset(mm, addr); |
33 | p4d = p4d_alloc(mm, pgd, address: addr); |
34 | pud = pud_alloc(mm, p4d, address: addr); |
35 | if (pud) |
36 | pte = (pte_t *)pmd_alloc(mm, pud, address: addr); |
37 | |
38 | return pte; |
39 | } |
40 | |
41 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr, |
42 | unsigned long sz) |
43 | { |
44 | pgd_t *pgd; |
45 | p4d_t *p4d; |
46 | pud_t *pud; |
47 | pmd_t *pmd = NULL; |
48 | |
49 | pgd = pgd_offset(mm, addr); |
50 | if (pgd_present(pgd: *pgd)) { |
51 | p4d = p4d_offset(pgd, address: addr); |
52 | if (p4d_present(p4d: *p4d)) { |
53 | pud = pud_offset(p4d, address: addr); |
54 | if (pud_present(pud: *pud)) |
55 | pmd = pmd_offset(pud, address: addr); |
56 | } |
57 | } |
58 | return (pte_t *) pmd; |
59 | } |
60 | |
61 | int pmd_huge(pmd_t pmd) |
62 | { |
63 | return (pmd_val(pmd) & _PAGE_HUGE) != 0; |
64 | } |
65 | |
66 | int pud_huge(pud_t pud) |
67 | { |
68 | return (pud_val(pud) & _PAGE_HUGE) != 0; |
69 | } |
70 | |