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