1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 */ 5 #include <linux/init.h> 6 #include <linux/export.h> 7 #include <linux/mm.h> 8 #include <asm/pgalloc.h> 9 #include <asm/pgtable.h> 10 #include <asm/tlbflush.h> 11 12 struct page *dmw_virt_to_page(unsigned long kaddr) 13 { 14 return phys_to_page(__pa(kaddr)); 15 } 16 EXPORT_SYMBOL(dmw_virt_to_page); 17 18 struct page *tlb_virt_to_page(unsigned long kaddr) 19 { 20 return phys_to_page(pfn_to_phys(pte_pfn(*virt_to_kpte(kaddr)))); 21 } 22 EXPORT_SYMBOL(tlb_virt_to_page); 23 24 pgd_t *pgd_alloc(struct mm_struct *mm) 25 { 26 pgd_t *init, *ret = NULL; 27 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0); 28 29 if (ptdesc) { 30 ret = (pgd_t *)ptdesc_address(ptdesc); 31 init = pgd_offset(&init_mm, 0UL); 32 pgd_init(ret); 33 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, 34 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); 35 } 36 37 return ret; 38 } 39 EXPORT_SYMBOL_GPL(pgd_alloc); 40 41 void pgd_init(void *addr) 42 { 43 unsigned long *p, *end; 44 unsigned long entry; 45 46 #if !defined(__PAGETABLE_PUD_FOLDED) 47 entry = (unsigned long)invalid_pud_table; 48 #elif !defined(__PAGETABLE_PMD_FOLDED) 49 entry = (unsigned long)invalid_pmd_table; 50 #else 51 entry = (unsigned long)invalid_pte_table; 52 #endif 53 54 p = (unsigned long *)addr; 55 end = p + PTRS_PER_PGD; 56 57 do { 58 p[0] = entry; 59 p[1] = entry; 60 p[2] = entry; 61 p[3] = entry; 62 p[4] = entry; 63 p += 8; 64 p[-3] = entry; 65 p[-2] = entry; 66 p[-1] = entry; 67 } while (p != end); 68 } 69 EXPORT_SYMBOL_GPL(pgd_init); 70 71 #ifndef __PAGETABLE_PMD_FOLDED 72 void pmd_init(void *addr) 73 { 74 unsigned long *p, *end; 75 unsigned long pagetable = (unsigned long)invalid_pte_table; 76 77 p = (unsigned long *)addr; 78 end = p + PTRS_PER_PMD; 79 80 do { 81 p[0] = pagetable; 82 p[1] = pagetable; 83 p[2] = pagetable; 84 p[3] = pagetable; 85 p[4] = pagetable; 86 p += 8; 87 p[-3] = pagetable; 88 p[-2] = pagetable; 89 p[-1] = pagetable; 90 } while (p != end); 91 } 92 EXPORT_SYMBOL_GPL(pmd_init); 93 #endif 94 95 #ifndef __PAGETABLE_PUD_FOLDED 96 void pud_init(void *addr) 97 { 98 unsigned long *p, *end; 99 unsigned long pagetable = (unsigned long)invalid_pmd_table; 100 101 p = (unsigned long *)addr; 102 end = p + PTRS_PER_PUD; 103 104 do { 105 p[0] = pagetable; 106 p[1] = pagetable; 107 p[2] = pagetable; 108 p[3] = pagetable; 109 p[4] = pagetable; 110 p += 8; 111 p[-3] = pagetable; 112 p[-2] = pagetable; 113 p[-1] = pagetable; 114 } while (p != end); 115 } 116 EXPORT_SYMBOL_GPL(pud_init); 117 #endif 118 119 void kernel_pte_init(void *addr) 120 { 121 unsigned long *p, *end; 122 123 p = (unsigned long *)addr; 124 end = p + PTRS_PER_PTE; 125 126 do { 127 p[0] = _PAGE_GLOBAL; 128 p[1] = _PAGE_GLOBAL; 129 p[2] = _PAGE_GLOBAL; 130 p[3] = _PAGE_GLOBAL; 131 p[4] = _PAGE_GLOBAL; 132 p += 8; 133 p[-3] = _PAGE_GLOBAL; 134 p[-2] = _PAGE_GLOBAL; 135 p[-1] = _PAGE_GLOBAL; 136 } while (p != end); 137 } 138 139 pmd_t mk_pmd(struct page *page, pgprot_t prot) 140 { 141 pmd_t pmd; 142 143 pmd_val(pmd) = (page_to_pfn(page) << PFN_PTE_SHIFT) | pgprot_val(prot); 144 145 return pmd; 146 } 147 148 void set_pmd_at(struct mm_struct *mm, unsigned long addr, 149 pmd_t *pmdp, pmd_t pmd) 150 { 151 WRITE_ONCE(*pmdp, pmd); 152 flush_tlb_all(); 153 } 154 155 void __init pagetable_init(void) 156 { 157 /* Initialize the entire pgd. */ 158 pgd_init(swapper_pg_dir); 159 pgd_init(invalid_pg_dir); 160 #ifndef __PAGETABLE_PUD_FOLDED 161 pud_init(invalid_pud_table); 162 #endif 163 #ifndef __PAGETABLE_PMD_FOLDED 164 pmd_init(invalid_pmd_table); 165 #endif 166 } 167