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 31 #if CONFIG_ARM64_PGTABLE_LEVELS > 2 32 33 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) 34 { 35 return (pmd_t *)__get_free_page(PGALLOC_GFP); 36 } 37 38 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 39 { 40 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1)); 41 free_page((unsigned long)pmd); 42 } 43 44 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 45 { 46 set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE)); 47 } 48 49 #endif /* CONFIG_ARM64_PGTABLE_LEVELS > 2 */ 50 51 #if CONFIG_ARM64_PGTABLE_LEVELS > 3 52 53 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) 54 { 55 return (pud_t *)__get_free_page(PGALLOC_GFP); 56 } 57 58 static inline void pud_free(struct mm_struct *mm, pud_t *pud) 59 { 60 BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); 61 free_page((unsigned long)pud); 62 } 63 64 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) 65 { 66 set_pgd(pgd, __pgd(__pa(pud) | PUD_TYPE_TABLE)); 67 } 68 69 #endif /* CONFIG_ARM64_PGTABLE_LEVELS > 3 */ 70 71 extern pgd_t *pgd_alloc(struct mm_struct *mm); 72 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); 73 74 static inline pte_t * 75 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr) 76 { 77 return (pte_t *)__get_free_page(PGALLOC_GFP); 78 } 79 80 static inline pgtable_t 81 pte_alloc_one(struct mm_struct *mm, unsigned long addr) 82 { 83 struct page *pte; 84 85 pte = alloc_pages(PGALLOC_GFP, 0); 86 if (!pte) 87 return NULL; 88 if (!pgtable_page_ctor(pte)) { 89 __free_page(pte); 90 return NULL; 91 } 92 return pte; 93 } 94 95 /* 96 * Free a PTE table. 97 */ 98 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 99 { 100 if (pte) 101 free_page((unsigned long)pte); 102 } 103 104 static inline void pte_free(struct mm_struct *mm, pgtable_t pte) 105 { 106 pgtable_page_dtor(pte); 107 __free_page(pte); 108 } 109 110 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte, 111 pmdval_t prot) 112 { 113 set_pmd(pmdp, __pmd(pte | prot)); 114 } 115 116 /* 117 * Populate the pmdp entry with a pointer to the pte. This pmd is part 118 * of the mm address space. 119 */ 120 static inline void 121 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) 122 { 123 /* 124 * The pmd must be loaded with the physical address of the PTE table 125 */ 126 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE); 127 } 128 129 static inline void 130 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) 131 { 132 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE); 133 } 134 #define pmd_pgtable(pmd) pmd_page(pmd) 135 136 #endif 137