| 1 | |
| 2 | * This file is subject to the terms and conditions of the GNU General Public
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| 3 | * License. See the file "COPYING" in the main directory of this archive
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| 4 | * for more details.
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| 5 | *
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| 6 | * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle
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| 7 | * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
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| 8 |
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| 9 | #ifndef _ASM_PGALLOC_H
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| 10 | #define _ASM_PGALLOC_H
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| 11 |
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| 12 | #include <linux/highmem.h>
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| 13 | #include <linux/mm.h>
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| 14 | #include <linux/sched.h>
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| 15 |
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| 16 | static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
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| 17 | pte_t *pte)
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| 18 | {
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| 19 | set_pmd(pmd, __pmd((unsigned long)pte));
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| 20 | }
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| 21 |
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| 22 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
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| 23 | struct page *pte)
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| 24 | {
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| 25 | set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
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| 26 | }
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| 27 |
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| 28 | |
| 29 | * Initialize a new pmd table with invalid pointers.
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| 30 |
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| 31 | extern void pmd_init(unsigned long page, unsigned long pagetable);
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| 32 |
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| 33 | #ifdef CONFIG_64BIT
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| 34 |
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| 35 | static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
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| 36 | {
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| 37 | set_pud(pud, __pud((unsigned long)pmd));
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| 38 | }
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| 39 | #endif
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| 40 |
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| 41 | |
| 42 | * Initialize a new pgd / pmd table with invalid pointers.
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| 43 |
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| 44 | extern void pgd_init(unsigned long page);
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| 45 |
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| 46 | static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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| 47 | {
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| 48 | pgd_t *ret, *init;
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| 49 |
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| 50 | ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
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| 51 | if (ret) {
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| 52 | init = pgd_offset(&init_mm, 0UL);
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| 53 | pgd_init((unsigned long)ret);
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| 54 | memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
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| 55 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
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| 56 | }
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| 57 |
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| 58 | return ret;
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| 59 | }
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| 60 |
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| 61 | static inline void pgd_free(pgd_t *pgd)
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| 62 | {
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| 63 | free_pages((unsigned long)pgd, PGD_ORDER);
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| 64 | }
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| 65 |
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| 66 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
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| 67 | unsigned long address)
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| 68 | {
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| 69 | pte_t *pte;
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| 70 |
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| 71 | pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER);
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| 72 |
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| 73 | return pte;
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| 74 | }
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| 75 |
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| 76 | static inline struct page *pte_alloc_one(struct mm_struct *mm,
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| 77 | unsigned long address)
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| 78 | {
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| 79 | struct page *pte;
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| 80 |
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| 81 | pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
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| 82 | if (pte)
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| 83 | clear_highpage(pte);
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| 84 |
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| 85 | return pte;
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| 86 | }
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| 87 |
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| 88 | static inline void pte_free_kernel(pte_t *pte)
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| 89 | {
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| 90 | free_pages((unsigned long)pte, PTE_ORDER);
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| 91 | }
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| 92 |
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| 93 | static inline void pte_free(struct page *pte)
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| 94 | {
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| 95 | __free_pages(pte, PTE_ORDER);
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| 96 | }
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| 97 |
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| 98 | #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
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| 99 |
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| 100 | #ifdef CONFIG_32BIT
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| 101 |
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| 102 | |
| 103 | * allocating and freeing a pmd is trivial: the 1-entry pmd is
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| 104 | * inside the pgd, so has no extra memory associated with it.
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| 105 |
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| 106 | #define pmd_free(x) do { } while (0)
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| 107 | #define __pmd_free_tlb(tlb,x) do { } while (0)
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| 108 |
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| 109 | #endif
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| 110 |
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| 111 | #ifdef CONFIG_64BIT
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| 112 |
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| 113 | static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
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| 114 | {
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| 115 | pmd_t *pmd;
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| 116 |
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| 117 | pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
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| 118 | if (pmd)
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| 119 | pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
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| 120 | return pmd;
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| 121 | }
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| 122 |
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| 123 | static inline void pmd_free(pmd_t *pmd)
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| 124 | {
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| 125 | free_pages((unsigned long)pmd, PMD_ORDER);
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| 126 | }
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| 127 |
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| 128 | #define __pmd_free_tlb(tlb,x) pmd_free(x)
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| 129 |
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| 130 | #endif
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| 131 |
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| 132 | #define check_pgt_cache() do { } while (0)
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| 133 |
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| 134 | extern void pagetable_init(void);
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| 135 |
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| 136 | #endif
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