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 #ifndef CONFIG_ARM64_64K_PAGES 30 31 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) 32 { 33 return (pmd_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT); 34 } 35 36 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 37 { 38 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1)); 39 free_page((unsigned long)pmd); 40 } 41 42 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 43 { 44 set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE)); 45 } 46 47 #endif /* CONFIG_ARM64_64K_PAGES */ 48 49 extern pgd_t *pgd_alloc(struct mm_struct *mm); 50 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); 51 52 #define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO) 53 54 static inline pte_t * 55 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr) 56 { 57 return (pte_t *)__get_free_page(PGALLOC_GFP); 58 } 59 60 static inline pgtable_t 61 pte_alloc_one(struct mm_struct *mm, unsigned long addr) 62 { 63 struct page *pte; 64 65 pte = alloc_pages(PGALLOC_GFP, 0); 66 if (!pte) 67 return NULL; 68 if (!pgtable_page_ctor(pte)) { 69 __free_page(pte); 70 return NULL; 71 } 72 return pte; 73 } 74 75 /* 76 * Free a PTE table. 77 */ 78 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 79 { 80 if (pte) 81 free_page((unsigned long)pte); 82 } 83 84 static inline void pte_free(struct mm_struct *mm, pgtable_t pte) 85 { 86 pgtable_page_dtor(pte); 87 __free_page(pte); 88 } 89 90 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte, 91 pmdval_t prot) 92 { 93 set_pmd(pmdp, __pmd(pte | prot)); 94 } 95 96 /* 97 * Populate the pmdp entry with a pointer to the pte. This pmd is part 98 * of the mm address space. 99 */ 100 static inline void 101 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) 102 { 103 /* 104 * The pmd must be loaded with the physical address of the PTE table 105 */ 106 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE); 107 } 108 109 static inline void 110 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) 111 { 112 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE); 113 } 114 #define pmd_pgtable(pmd) pmd_page(pmd) 115 116 #endif 117