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 struct page *page; 37 38 page = alloc_page(PGALLOC_GFP); 39 if (!page) 40 return NULL; 41 if (!pgtable_pmd_page_ctor(page)) { 42 __free_page(page); 43 return NULL; 44 } 45 return page_address(page); 46 } 47 48 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp) 49 { 50 BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1)); 51 pgtable_pmd_page_dtor(virt_to_page(pmdp)); 52 free_page((unsigned long)pmdp); 53 } 54 55 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot) 56 { 57 set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot)); 58 } 59 60 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp) 61 { 62 __pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE); 63 } 64 #else 65 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot) 66 { 67 BUILD_BUG(); 68 } 69 #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 70 71 #if CONFIG_PGTABLE_LEVELS > 3 72 73 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) 74 { 75 return (pud_t *)__get_free_page(PGALLOC_GFP); 76 } 77 78 static inline void pud_free(struct mm_struct *mm, pud_t *pudp) 79 { 80 BUG_ON((unsigned long)pudp & (PAGE_SIZE-1)); 81 free_page((unsigned long)pudp); 82 } 83 84 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot) 85 { 86 set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot)); 87 } 88 89 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp) 90 { 91 __pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE); 92 } 93 #else 94 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot) 95 { 96 BUILD_BUG(); 97 } 98 #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 99 100 extern pgd_t *pgd_alloc(struct mm_struct *mm); 101 extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp); 102 103 static inline pte_t * 104 pte_alloc_one_kernel(struct mm_struct *mm) 105 { 106 return (pte_t *)__get_free_page(PGALLOC_GFP); 107 } 108 109 static inline pgtable_t 110 pte_alloc_one(struct mm_struct *mm) 111 { 112 struct page *pte; 113 114 pte = alloc_pages(PGALLOC_GFP, 0); 115 if (!pte) 116 return NULL; 117 if (!pgtable_page_ctor(pte)) { 118 __free_page(pte); 119 return NULL; 120 } 121 return pte; 122 } 123 124 /* 125 * Free a PTE table. 126 */ 127 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *ptep) 128 { 129 if (ptep) 130 free_page((unsigned long)ptep); 131 } 132 133 static inline void pte_free(struct mm_struct *mm, pgtable_t pte) 134 { 135 pgtable_page_dtor(pte); 136 __free_page(pte); 137 } 138 139 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep, 140 pmdval_t prot) 141 { 142 set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot)); 143 } 144 145 /* 146 * Populate the pmdp entry with a pointer to the pte. This pmd is part 147 * of the mm address space. 148 */ 149 static inline void 150 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) 151 { 152 /* 153 * The pmd must be loaded with the physical address of the PTE table 154 */ 155 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE); 156 } 157 158 static inline void 159 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) 160 { 161 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE); 162 } 163 #define pmd_pgtable(pmd) pmd_page(pmd) 164 165 #endif 166