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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | // SPDX-License-Identifier: GPL-2.0-or-later /* * This file contains pgtable related functions for 64-bit machines. * * Derived from arch/ppc64/mm/init.c * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * * Modifications by Paul Mackerras (PowerMac) (paulus@samba.org) * and Cort Dougan (PReP) (cort@cs.nmt.edu) * Copyright (C) 1996 Paul Mackerras * * Derived from "arch/i386/mm/init.c" * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds * * Dave Engebretsen <engebret@us.ibm.com> * Rework for PPC64 port. */ #include <linux/signal.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/export.h> #include <linux/types.h> #include <linux/mman.h> #include <linux/mm.h> #include <linux/swap.h> #include <linux/stddef.h> #include <linux/vmalloc.h> #include <linux/slab.h> #include <linux/hugetlb.h> #include <asm/page.h> #include <asm/mmu_context.h> #include <asm/mmu.h> #include <asm/smp.h> #include <asm/machdep.h> #include <asm/tlb.h> #include <asm/processor.h> #include <asm/cputable.h> #include <asm/sections.h> #include <asm/firmware.h> #include <asm/dma.h> #include <mm/mmu_decl.h> #ifdef CONFIG_PPC_BOOK3S_64 /* * partition table and process table for ISA 3.0 */ struct prtb_entry *process_tb; struct patb_entry *partition_tb; /* * page table size */ unsigned long __pte_index_size; EXPORT_SYMBOL(__pte_index_size); unsigned long __pmd_index_size; EXPORT_SYMBOL(__pmd_index_size); unsigned long __pud_index_size; EXPORT_SYMBOL(__pud_index_size); unsigned long __pgd_index_size; EXPORT_SYMBOL(__pgd_index_size); unsigned long __pud_cache_index; EXPORT_SYMBOL(__pud_cache_index); unsigned long __pte_table_size; EXPORT_SYMBOL(__pte_table_size); unsigned long __pmd_table_size; EXPORT_SYMBOL(__pmd_table_size); unsigned long __pud_table_size; EXPORT_SYMBOL(__pud_table_size); unsigned long __pgd_table_size; EXPORT_SYMBOL(__pgd_table_size); unsigned long __pmd_val_bits; EXPORT_SYMBOL(__pmd_val_bits); unsigned long __pud_val_bits; EXPORT_SYMBOL(__pud_val_bits); unsigned long __pgd_val_bits; EXPORT_SYMBOL(__pgd_val_bits); unsigned long __kernel_virt_start; EXPORT_SYMBOL(__kernel_virt_start); unsigned long __vmalloc_start; EXPORT_SYMBOL(__vmalloc_start); unsigned long __vmalloc_end; EXPORT_SYMBOL(__vmalloc_end); unsigned long __kernel_io_start; EXPORT_SYMBOL(__kernel_io_start); unsigned long __kernel_io_end; struct page *vmemmap; EXPORT_SYMBOL(vmemmap); unsigned long __pte_frag_nr; EXPORT_SYMBOL(__pte_frag_nr); unsigned long __pte_frag_size_shift; EXPORT_SYMBOL(__pte_frag_size_shift); #endif #ifndef __PAGETABLE_PUD_FOLDED /* 4 level page table */ struct page *p4d_page(p4d_t p4d) { if (p4d_is_leaf(p4d)) { if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP)) VM_WARN_ON(!p4d_huge(p4d)); return pte_page(p4d_pte(p4d)); } return virt_to_page(p4d_pgtable(p4d)); } #endif struct page *pud_page(pud_t pud) { if (pud_is_leaf(pud)) { if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP)) VM_WARN_ON(!pud_huge(pud)); return pte_page(pud_pte(pud)); } return virt_to_page(pud_pgtable(pud)); } /* * For hugepage we have pfn in the pmd, we use PTE_RPN_SHIFT bits for flags * For PTE page, we have a PTE_FRAG_SIZE (4K) aligned virtual address. */ struct page *pmd_page(pmd_t pmd) { if (pmd_is_leaf(pmd)) { /* * vmalloc_to_page may be called on any vmap address (not only * vmalloc), and it uses pmd_page() etc., when huge vmap is * enabled so these checks can't be used. */ if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP)) VM_WARN_ON(!(pmd_large(pmd) || pmd_huge(pmd))); return pte_page(pmd_pte(pmd)); } return virt_to_page(pmd_page_vaddr(pmd)); } #ifdef CONFIG_STRICT_KERNEL_RWX void mark_rodata_ro(void) { if (!mmu_has_feature(MMU_FTR_KERNEL_RO)) { pr_warn("Warning: Unable to mark rodata read only on this CPU.\n"); return; } if (radix_enabled()) radix__mark_rodata_ro(); else hash__mark_rodata_ro(); // mark_initmem_nx() should have already run by now ptdump_check_wx(); } void mark_initmem_nx(void) { if (radix_enabled()) radix__mark_initmem_nx(); else hash__mark_initmem_nx(); } #endif |