projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | } |