| 1 | |
| 2 | * This file is subject to the terms and conditions of the GNU General Public
|
| 3 | * License. See the file "COPYING" in the main directory of this archive
|
| 4 | * for more details.
|
| 5 | *
|
| 6 | * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle
|
| 7 | * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
|
| 8 |
|
| 9 | #ifndef _ASM_PGALLOC_H
|
| 10 | #define _ASM_PGALLOC_H
|
| 11 |
|
| 12 | #include <linux/highmem.h>
|
| 13 | #include <linux/mm.h>
|
| 14 |
|
| 15 | static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
|
| 16 | pte_t *pte)
|
| 17 | {
|
| 18 | set_pmd(pmd, __pmd((unsigned long)pte));
|
| 19 | }
|
| 20 |
|
| 21 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
|
| 22 | struct page *pte)
|
| 23 | {
|
| 24 | set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
|
| 25 | }
|
| 26 |
|
| 27 | |
| 28 | * Initialize a new pmd table with invalid pointers.
|
| 29 |
|
| 30 | extern void pmd_init(unsigned long page, unsigned long pagetable);
|
| 31 |
|
| 32 | #ifdef CONFIG_64BIT
|
| 33 |
|
| 34 | static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
|
| 35 | {
|
| 36 | set_pud(pud, __pud((unsigned long)pmd));
|
| 37 | }
|
| 38 | #endif
|
| 39 |
|
| 40 | |
| 41 | * Initialize a new pgd / pmd table with invalid pointers.
|
| 42 |
|
| 43 | extern void pgd_init(unsigned long page);
|
| 44 |
|
| 45 | static inline pgd_t *pgd_alloc(struct mm_struct *mm)
|
| 46 | {
|
| 47 | pgd_t *ret, *init;
|
| 48 |
|
| 49 | ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
|
| 50 | if (ret) {
|
| 51 | init = pgd_offset(&init_mm, 0UL);
|
| 52 | pgd_init((unsigned long)ret);
|
| 53 | memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
|
| 54 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
|
| 55 | }
|
| 56 |
|
| 57 | return ret;
|
| 58 | }
|
| 59 |
|
| 60 | static inline void pgd_free(pgd_t *pgd)
|
| 61 | {
|
| 62 | free_pages((unsigned long)pgd, PGD_ORDER);
|
| 63 | }
|
| 64 |
|
| 65 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
|
| 66 | unsigned long address)
|
| 67 | {
|
| 68 | pte_t *pte;
|
| 69 |
|
| 70 | pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER);
|
| 71 |
|
| 72 | return pte;
|
| 73 | }
|
| 74 |
|
| 75 | static inline struct page *pte_alloc_one(struct mm_struct *mm,
|
| 76 | unsigned long address)
|
| 77 | {
|
| 78 | struct page *pte;
|
| 79 |
|
| 80 | pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
|
| 81 | if (pte)
|
| 82 | clear_highpage(pte);
|
| 83 |
|
| 84 | return pte;
|
| 85 | }
|
| 86 |
|
| 87 | static inline void pte_free_kernel(pte_t *pte)
|
| 88 | {
|
| 89 | free_pages((unsigned long)pte, PTE_ORDER);
|
| 90 | }
|
| 91 |
|
| 92 | static inline void pte_free(struct page *pte)
|
| 93 | {
|
| 94 | __free_pages(pte, PTE_ORDER);
|
| 95 | }
|
| 96 |
|
| 97 | #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
|
| 98 |
|
| 99 | #ifdef CONFIG_32BIT
|
| 100 |
|
| 101 | |
| 102 | * allocating and freeing a pmd is trivial: the 1-entry pmd is
|
| 103 | * inside the pgd, so has no extra memory associated with it.
|
| 104 |
|
| 105 | #define pmd_free(x) do { } while (0)
|
| 106 | #define __pmd_free_tlb(tlb,x) do { } while (0)
|
| 107 |
|
| 108 | #endif
|
| 109 |
|
| 110 | #ifdef CONFIG_64BIT
|
| 111 |
|
| 112 | static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
|
| 113 | {
|
| 114 | pmd_t *pmd;
|
| 115 |
|
| 116 | pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
|
| 117 | if (pmd)
|
| 118 | pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
|
| 119 | return pmd;
|
| 120 | }
|
| 121 |
|
| 122 | static inline void pmd_free(pmd_t *pmd)
|
| 123 | {
|
| 124 | free_pages((unsigned long)pmd, PMD_ORDER);
|
| 125 | }
|
| 126 |
|
| 127 | #define __pmd_free_tlb(tlb,x) pmd_free(x)
|
| 128 |
|
| 129 | #endif
|
| 130 |
|
| 131 | #define check_pgt_cache() do { } while (0)
|
| 132 |
|
| 133 | extern void pagetable_init(void);
|
| 134 |
|
| 135 | #endif
|