1 /* 2 * Based on arch/arm/include/asm/pgalloc.h 3 * 4 * Copyright (C) 2000-2001 Russell King 5 * Copyright (C) 2012 ARM Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 #ifndef __ASM_PGALLOC_H 20 #define __ASM_PGALLOC_H 21 22 #include <asm/pgtable-hwdef.h> 23 #include <asm/processor.h> 24 #include <asm/cacheflush.h> 25 #include <asm/tlbflush.h> 26 27 #define check_pgt_cache() do { } while (0) 28 29 #define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO) 30 #define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t)) 31 32 #if CONFIG_PGTABLE_LEVELS > 2 33 34 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) 35 { 36 return (pmd_t *)__get_free_page(PGALLOC_GFP); 37 } 38 39 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 40 { 41 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1)); 42 free_page((unsigned long)pmd); 43 } 44 45 static inline void __pud_populate(pud_t *pud, phys_addr_t pmd, pudval_t prot) 46 { 47 set_pud(pud, __pud(pmd | prot)); 48 } 49 50 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 51 { 52 __pud_populate(pud, __pa(pmd), PMD_TYPE_TABLE); 53 } 54 #else 55 static inline void __pud_populate(pud_t *pud, phys_addr_t pmd, pudval_t prot) 56 { 57 BUILD_BUG(); 58 } 59 #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 60 61 #if CONFIG_PGTABLE_LEVELS > 3 62 63 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) 64 { 65 return (pud_t *)__get_free_page(PGALLOC_GFP); 66 } 67 68 static inline void pud_free(struct mm_struct *mm, pud_t *pud) 69 { 70 BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); 71 free_page((unsigned long)pud); 72 } 73 74 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pud, pgdval_t prot) 75 { 76 set_pgd(pgdp, __pgd(pud | prot)); 77 } 78 79 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) 80 { 81 __pgd_populate(pgd, __pa(pud), PUD_TYPE_TABLE); 82 } 83 #else 84 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pud, pgdval_t prot) 85 { 86 BUILD_BUG(); 87 } 88 #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 89 90 extern pgd_t *pgd_alloc(struct mm_struct *mm); 91 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); 92 93 static inline pte_t * 94 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr) 95 { 96 return (pte_t *)__get_free_page(PGALLOC_GFP); 97 } 98 99 static inline pgtable_t 100 pte_alloc_one(struct mm_struct *mm, unsigned long addr) 101 { 102 struct page *pte; 103 104 pte = alloc_pages(PGALLOC_GFP, 0); 105 if (!pte) 106 return NULL; 107 if (!pgtable_page_ctor(pte)) { 108 __free_page(pte); 109 return NULL; 110 } 111 return pte; 112 } 113 114 /* 115 * Free a PTE table. 116 */ 117 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 118 { 119 if (pte) 120 free_page((unsigned long)pte); 121 } 122 123 static inline void pte_free(struct mm_struct *mm, pgtable_t pte) 124 { 125 pgtable_page_dtor(pte); 126 __free_page(pte); 127 } 128 129 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte, 130 pmdval_t prot) 131 { 132 set_pmd(pmdp, __pmd(pte | prot)); 133 } 134 135 /* 136 * Populate the pmdp entry with a pointer to the pte. This pmd is part 137 * of the mm address space. 138 */ 139 static inline void 140 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) 141 { 142 /* 143 * The pmd must be loaded with the physical address of the PTE table 144 */ 145 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE); 146 } 147 148 static inline void 149 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) 150 { 151 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE); 152 } 153 #define pmd_pgtable(pmd) pmd_page(pmd) 154 155 #endif 156