1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com> 4 * Copyright (C) 2012 Regents of the University of California 5 */ 6 7 #ifndef _ASM_RISCV_PGALLOC_H 8 #define _ASM_RISCV_PGALLOC_H 9 10 #include <linux/mm.h> 11 #include <asm/sbi.h> 12 #include <asm/tlb.h> 13 14 #ifdef CONFIG_MMU 15 #define __HAVE_ARCH_PUD_FREE 16 #include <asm-generic/pgalloc.h> 17 18 static inline void pmd_populate_kernel(struct mm_struct *mm, 19 pmd_t *pmd, pte_t *pte) 20 { 21 unsigned long pfn = virt_to_pfn(pte); 22 23 set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 24 } 25 26 static inline void pmd_populate(struct mm_struct *mm, 27 pmd_t *pmd, pgtable_t pte) 28 { 29 unsigned long pfn = virt_to_pfn(page_address(pte)); 30 31 set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 32 } 33 34 #ifndef __PAGETABLE_PMD_FOLDED 35 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 36 { 37 unsigned long pfn = virt_to_pfn(pmd); 38 39 set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 40 } 41 42 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) 43 { 44 if (pgtable_l4_enabled) { 45 unsigned long pfn = virt_to_pfn(pud); 46 47 set_p4d(p4d, __p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 48 } 49 } 50 51 static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, 52 pud_t *pud) 53 { 54 if (pgtable_l4_enabled) { 55 unsigned long pfn = virt_to_pfn(pud); 56 57 set_p4d_safe(p4d, 58 __p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 59 } 60 } 61 62 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) 63 { 64 if (pgtable_l5_enabled) { 65 unsigned long pfn = virt_to_pfn(p4d); 66 67 set_pgd(pgd, __pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 68 } 69 } 70 71 static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, 72 p4d_t *p4d) 73 { 74 if (pgtable_l5_enabled) { 75 unsigned long pfn = virt_to_pfn(p4d); 76 77 set_pgd_safe(pgd, 78 __pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 79 } 80 } 81 82 #define pud_free pud_free 83 static inline void pud_free(struct mm_struct *mm, pud_t *pud) 84 { 85 if (pgtable_l4_enabled) 86 __pud_free(mm, pud); 87 } 88 89 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud, 90 unsigned long addr) 91 { 92 if (pgtable_l4_enabled) 93 tlb_remove_ptdesc(tlb, virt_to_ptdesc(pud)); 94 } 95 96 static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d, 97 unsigned long addr) 98 { 99 if (pgtable_l5_enabled) 100 tlb_remove_ptdesc(tlb, virt_to_ptdesc(p4d)); 101 } 102 #endif /* __PAGETABLE_PMD_FOLDED */ 103 104 static inline void sync_kernel_mappings(pgd_t *pgd) 105 { 106 memcpy(pgd + USER_PTRS_PER_PGD, 107 init_mm.pgd + USER_PTRS_PER_PGD, 108 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); 109 } 110 111 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 112 { 113 pgd_t *pgd; 114 115 pgd = __pgd_alloc(mm, 0); 116 if (likely(pgd != NULL)) { 117 /* Copy kernel mappings */ 118 sync_kernel_mappings(pgd); 119 } 120 return pgd; 121 } 122 123 #ifndef __PAGETABLE_PMD_FOLDED 124 125 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd, 126 unsigned long addr) 127 { 128 tlb_remove_ptdesc(tlb, virt_to_ptdesc(pmd)); 129 } 130 131 #endif /* __PAGETABLE_PMD_FOLDED */ 132 133 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, 134 unsigned long addr) 135 { 136 tlb_remove_ptdesc(tlb, page_ptdesc(pte)); 137 } 138 #endif /* CONFIG_MMU */ 139 140 #endif /* _ASM_RISCV_PGALLOC_H */ 141