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 #include <linux/sched.h> 15 16 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, 17 pte_t *pte) 18 { 19 set_pmd(pmd, __pmd((unsigned long)pte)); 20 } 21 22 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 23 pgtable_t pte) 24 { 25 set_pmd(pmd, __pmd((unsigned long)page_address(pte))); 26 } 27 #define pmd_pgtable(pmd) pmd_page(pmd) 28 29 /* 30 * Initialize a new pmd table with invalid pointers. 31 */ 32 extern void pmd_init(unsigned long page, unsigned long pagetable); 33 34 #ifndef __PAGETABLE_PMD_FOLDED 35 36 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 37 { 38 set_pud(pud, __pud((unsigned long)pmd)); 39 } 40 #endif 41 42 /* 43 * Initialize a new pgd / pmd table with invalid pointers. 44 */ 45 extern void pgd_init(unsigned long page); 46 extern pgd_t *pgd_alloc(struct mm_struct *mm); 47 48 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 49 { 50 free_pages((unsigned long)pgd, PGD_ORDER); 51 } 52 53 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) 54 { 55 return (pte_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, PTE_ORDER); 56 } 57 58 static inline struct page *pte_alloc_one(struct mm_struct *mm) 59 { 60 struct page *pte; 61 62 pte = alloc_pages(GFP_KERNEL, PTE_ORDER); 63 if (!pte) 64 return NULL; 65 clear_highpage(pte); 66 if (!pgtable_page_ctor(pte)) { 67 __free_page(pte); 68 return NULL; 69 } 70 return pte; 71 } 72 73 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 74 { 75 free_pages((unsigned long)pte, PTE_ORDER); 76 } 77 78 static inline void pte_free(struct mm_struct *mm, pgtable_t pte) 79 { 80 pgtable_page_dtor(pte); 81 __free_pages(pte, PTE_ORDER); 82 } 83 84 #define __pte_free_tlb(tlb,pte,address) \ 85 do { \ 86 pgtable_page_dtor(pte); \ 87 tlb_remove_page((tlb), pte); \ 88 } while (0) 89 90 #ifndef __PAGETABLE_PMD_FOLDED 91 92 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) 93 { 94 pmd_t *pmd; 95 96 pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ORDER); 97 if (pmd) 98 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table); 99 return pmd; 100 } 101 102 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 103 { 104 free_pages((unsigned long)pmd, PMD_ORDER); 105 } 106 107 #define __pmd_free_tlb(tlb, x, addr) pmd_free((tlb)->mm, x) 108 109 #endif 110 111 #ifndef __PAGETABLE_PUD_FOLDED 112 113 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) 114 { 115 pud_t *pud; 116 117 pud = (pud_t *) __get_free_pages(GFP_KERNEL, PUD_ORDER); 118 if (pud) 119 pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table); 120 return pud; 121 } 122 123 static inline void pud_free(struct mm_struct *mm, pud_t *pud) 124 { 125 free_pages((unsigned long)pud, PUD_ORDER); 126 } 127 128 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) 129 { 130 set_pgd(pgd, __pgd((unsigned long)pud)); 131 } 132 133 #define __pud_free_tlb(tlb, x, addr) pud_free((tlb)->mm, x) 134 135 #endif /* __PAGETABLE_PUD_FOLDED */ 136 137 #define check_pgt_cache() do { } while (0) 138 139 extern void pagetable_init(void); 140 141 #endif /* _ASM_PGALLOC_H */ 142