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_NOTRACK | __GFP_REPEAT | __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(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 46 { 47 set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE)); 48 } 49 50 #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 51 52 #if CONFIG_PGTABLE_LEVELS > 3 53 54 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) 55 { 56 return (pud_t *)__get_free_page(PGALLOC_GFP); 57 } 58 59 static inline void pud_free(struct mm_struct *mm, pud_t *pud) 60 { 61 BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); 62 free_page((unsigned long)pud); 63 } 64 65 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) 66 { 67 set_pgd(pgd, __pgd(__pa(pud) | PUD_TYPE_TABLE)); 68 } 69 70 #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 71 72 extern pgd_t *pgd_alloc(struct mm_struct *mm); 73 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); 74 75 static inline pte_t * 76 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr) 77 { 78 return (pte_t *)__get_free_page(PGALLOC_GFP); 79 } 80 81 static inline pgtable_t 82 pte_alloc_one(struct mm_struct *mm, unsigned long addr) 83 { 84 struct page *pte; 85 86 pte = alloc_pages(PGALLOC_GFP, 0); 87 if (!pte) 88 return NULL; 89 if (!pgtable_page_ctor(pte)) { 90 __free_page(pte); 91 return NULL; 92 } 93 return pte; 94 } 95 96 /* 97 * Free a PTE table. 98 */ 99 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 100 { 101 if (pte) 102 free_page((unsigned long)pte); 103 } 104 105 static inline void pte_free(struct mm_struct *mm, pgtable_t pte) 106 { 107 pgtable_page_dtor(pte); 108 __free_page(pte); 109 } 110 111 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte, 112 pmdval_t prot) 113 { 114 set_pmd(pmdp, __pmd(pte | prot)); 115 } 116 117 /* 118 * Populate the pmdp entry with a pointer to the pte. This pmd is part 119 * of the mm address space. 120 */ 121 static inline void 122 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) 123 { 124 /* 125 * The pmd must be loaded with the physical address of the PTE table 126 */ 127 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE); 128 } 129 130 static inline void 131 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) 132 { 133 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE); 134 } 135 #define pmd_pgtable(pmd) pmd_page(pmd) 136 137 #endif 138