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 47 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 48 { 49 pgd_t *ret, *init; 50 51 ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER); 52 if (ret) { 53 init = pgd_offset(&init_mm, 0UL); 54 pgd_init((unsigned long)ret); 55 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, 56 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); 57 } 58 59 return ret; 60 } 61 62 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 63 { 64 free_pages((unsigned long)pgd, PGD_ORDER); 65 } 66 67 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, 68 unsigned long address) 69 { 70 pte_t *pte; 71 72 pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER); 73 74 return pte; 75 } 76 77 static inline struct page *pte_alloc_one(struct mm_struct *mm, 78 unsigned long address) 79 { 80 struct page *pte; 81 82 pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER); 83 if (!pte) 84 return NULL; 85 clear_highpage(pte); 86 if (!pgtable_page_ctor(pte)) { 87 __free_page(pte); 88 return NULL; 89 } 90 return pte; 91 } 92 93 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 94 { 95 free_pages((unsigned long)pte, PTE_ORDER); 96 } 97 98 static inline void pte_free(struct mm_struct *mm, pgtable_t pte) 99 { 100 pgtable_page_dtor(pte); 101 __free_pages(pte, PTE_ORDER); 102 } 103 104 #define __pte_free_tlb(tlb,pte,address) \ 105 do { \ 106 pgtable_page_dtor(pte); \ 107 tlb_remove_page((tlb), pte); \ 108 } while (0) 109 110 #ifndef __PAGETABLE_PMD_FOLDED 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(struct mm_struct *mm, pmd_t *pmd) 123 { 124 free_pages((unsigned long)pmd, PMD_ORDER); 125 } 126 127 #define __pmd_free_tlb(tlb, x, addr) pmd_free((tlb)->mm, x) 128 129 #endif 130 131 #define check_pgt_cache() do { } while (0) 132 133 extern void pagetable_init(void); 134 135 #endif /* _ASM_PGALLOC_H */ 136