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 #include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */ 17 18 #define check_pgt_cache() do { } while (0) 19 20 #define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t)) 21 22 #if CONFIG_PGTABLE_LEVELS > 2 23 24 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) 25 { 26 gfp_t gfp = GFP_PGTABLE_USER; 27 struct page *page; 28 29 if (mm == &init_mm) 30 gfp = GFP_PGTABLE_KERNEL; 31 32 page = alloc_page(gfp); 33 if (!page) 34 return NULL; 35 if (!pgtable_pmd_page_ctor(page)) { 36 __free_page(page); 37 return NULL; 38 } 39 return page_address(page); 40 } 41 42 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp) 43 { 44 BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1)); 45 pgtable_pmd_page_dtor(virt_to_page(pmdp)); 46 free_page((unsigned long)pmdp); 47 } 48 49 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot) 50 { 51 set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot)); 52 } 53 54 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp) 55 { 56 __pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE); 57 } 58 #else 59 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot) 60 { 61 BUILD_BUG(); 62 } 63 #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 64 65 #if CONFIG_PGTABLE_LEVELS > 3 66 67 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) 68 { 69 return (pud_t *)__get_free_page(GFP_PGTABLE_USER); 70 } 71 72 static inline void pud_free(struct mm_struct *mm, pud_t *pudp) 73 { 74 BUG_ON((unsigned long)pudp & (PAGE_SIZE-1)); 75 free_page((unsigned long)pudp); 76 } 77 78 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot) 79 { 80 set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot)); 81 } 82 83 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp) 84 { 85 __pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE); 86 } 87 #else 88 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot) 89 { 90 BUILD_BUG(); 91 } 92 #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 93 94 extern pgd_t *pgd_alloc(struct mm_struct *mm); 95 extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp); 96 97 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep, 98 pmdval_t prot) 99 { 100 set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot)); 101 } 102 103 /* 104 * Populate the pmdp entry with a pointer to the pte. This pmd is part 105 * of the mm address space. 106 */ 107 static inline void 108 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) 109 { 110 /* 111 * The pmd must be loaded with the physical address of the PTE table 112 */ 113 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE); 114 } 115 116 static inline void 117 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) 118 { 119 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE); 120 } 121 #define pmd_pgtable(pmd) pmd_page(pmd) 122 123 #endif 124