1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Based on arch/arm/include/asm/pgalloc.h 4 * 5 * Copyright (C) 2000-2001 Russell King 6 * Copyright (C) 2012 ARM Ltd. 7 */ 8 #ifndef __ASM_PGALLOC_H 9 #define __ASM_PGALLOC_H 10 11 #include <asm/pgtable-hwdef.h> 12 #include <asm/processor.h> 13 #include <asm/cacheflush.h> 14 #include <asm/tlbflush.h> 15 16 #define check_pgt_cache() do { } while (0) 17 18 #define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO) 19 #define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t)) 20 21 #if CONFIG_PGTABLE_LEVELS > 2 22 23 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) 24 { 25 struct page *page; 26 27 page = alloc_page(PGALLOC_GFP); 28 if (!page) 29 return NULL; 30 if (!pgtable_pmd_page_ctor(page)) { 31 __free_page(page); 32 return NULL; 33 } 34 return page_address(page); 35 } 36 37 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp) 38 { 39 BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1)); 40 pgtable_pmd_page_dtor(virt_to_page(pmdp)); 41 free_page((unsigned long)pmdp); 42 } 43 44 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot) 45 { 46 set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot)); 47 } 48 49 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp) 50 { 51 __pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE); 52 } 53 #else 54 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot) 55 { 56 BUILD_BUG(); 57 } 58 #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 59 60 #if CONFIG_PGTABLE_LEVELS > 3 61 62 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) 63 { 64 return (pud_t *)__get_free_page(PGALLOC_GFP); 65 } 66 67 static inline void pud_free(struct mm_struct *mm, pud_t *pudp) 68 { 69 BUG_ON((unsigned long)pudp & (PAGE_SIZE-1)); 70 free_page((unsigned long)pudp); 71 } 72 73 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot) 74 { 75 set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot)); 76 } 77 78 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp) 79 { 80 __pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE); 81 } 82 #else 83 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot) 84 { 85 BUILD_BUG(); 86 } 87 #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 88 89 extern pgd_t *pgd_alloc(struct mm_struct *mm); 90 extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp); 91 92 static inline pte_t * 93 pte_alloc_one_kernel(struct mm_struct *mm) 94 { 95 return (pte_t *)__get_free_page(PGALLOC_GFP); 96 } 97 98 static inline pgtable_t 99 pte_alloc_one(struct mm_struct *mm) 100 { 101 struct page *pte; 102 103 pte = alloc_pages(PGALLOC_GFP, 0); 104 if (!pte) 105 return NULL; 106 if (!pgtable_page_ctor(pte)) { 107 __free_page(pte); 108 return NULL; 109 } 110 return pte; 111 } 112 113 /* 114 * Free a PTE table. 115 */ 116 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *ptep) 117 { 118 if (ptep) 119 free_page((unsigned long)ptep); 120 } 121 122 static inline void pte_free(struct mm_struct *mm, pgtable_t pte) 123 { 124 pgtable_page_dtor(pte); 125 __free_page(pte); 126 } 127 128 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep, 129 pmdval_t prot) 130 { 131 set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot)); 132 } 133 134 /* 135 * Populate the pmdp entry with a pointer to the pte. This pmd is part 136 * of the mm address space. 137 */ 138 static inline void 139 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) 140 { 141 /* 142 * The pmd must be loaded with the physical address of the PTE table 143 */ 144 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE); 145 } 146 147 static inline void 148 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) 149 { 150 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE); 151 } 152 #define pmd_pgtable(pmd) pmd_page(pmd) 153 154 #endif 155