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 PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t)) 19 20 #if CONFIG_PGTABLE_LEVELS > 2 21 22 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) 23 { 24 gfp_t gfp = GFP_PGTABLE_USER; 25 struct page *page; 26 27 if (mm == &init_mm) 28 gfp = GFP_PGTABLE_KERNEL; 29 30 page = alloc_page(gfp); 31 if (!page) 32 return NULL; 33 if (!pgtable_pmd_page_ctor(page)) { 34 __free_page(page); 35 return NULL; 36 } 37 return page_address(page); 38 } 39 40 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp) 41 { 42 BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1)); 43 pgtable_pmd_page_dtor(virt_to_page(pmdp)); 44 free_page((unsigned long)pmdp); 45 } 46 47 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot) 48 { 49 set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot)); 50 } 51 52 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp) 53 { 54 __pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE); 55 } 56 #else 57 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot) 58 { 59 BUILD_BUG(); 60 } 61 #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 62 63 #if CONFIG_PGTABLE_LEVELS > 3 64 65 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) 66 { 67 return (pud_t *)__get_free_page(GFP_PGTABLE_USER); 68 } 69 70 static inline void pud_free(struct mm_struct *mm, pud_t *pudp) 71 { 72 BUG_ON((unsigned long)pudp & (PAGE_SIZE-1)); 73 free_page((unsigned long)pudp); 74 } 75 76 static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot) 77 { 78 set_p4d(p4dp, __p4d(__phys_to_p4d_val(pudp) | prot)); 79 } 80 81 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp) 82 { 83 __p4d_populate(p4dp, __pa(pudp), PUD_TYPE_TABLE); 84 } 85 #else 86 static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot) 87 { 88 BUILD_BUG(); 89 } 90 #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 91 92 extern pgd_t *pgd_alloc(struct mm_struct *mm); 93 extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp); 94 95 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep, 96 pmdval_t prot) 97 { 98 set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot)); 99 } 100 101 /* 102 * Populate the pmdp entry with a pointer to the pte. This pmd is part 103 * of the mm address space. 104 */ 105 static inline void 106 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) 107 { 108 /* 109 * The pmd must be loaded with the physical address of the PTE table 110 */ 111 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE); 112 } 113 114 static inline void 115 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) 116 { 117 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE); 118 } 119 #define pmd_pgtable(pmd) pmd_page(pmd) 120 121 #endif 122