166 lines
4.1 KiB
C
166 lines
4.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* This file contains pgtable related functions for 64-bit machines.
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*
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* Derived from arch/ppc64/mm/init.c
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modifications by Paul Mackerras (PowerMac) (paulus@samba.org)
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* and Cort Dougan (PReP) (cort@cs.nmt.edu)
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* Copyright (C) 1996 Paul Mackerras
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*
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* Dave Engebretsen <engebret@us.ibm.com>
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* Rework for PPC64 port.
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/export.h>
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#include <linux/types.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/stddef.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/hugetlb.h>
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#include <asm/page.h>
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#include <asm/mmu_context.h>
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#include <asm/mmu.h>
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#include <asm/smp.h>
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#include <asm/machdep.h>
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#include <asm/tlb.h>
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#include <asm/processor.h>
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#include <asm/cputable.h>
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#include <asm/sections.h>
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#include <asm/firmware.h>
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#include <asm/dma.h>
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#include <mm/mmu_decl.h>
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#ifdef CONFIG_PPC_BOOK3S_64
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/*
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* partition table and process table for ISA 3.0
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*/
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struct prtb_entry *process_tb;
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struct patb_entry *partition_tb;
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/*
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* page table size
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*/
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unsigned long __pte_index_size;
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EXPORT_SYMBOL(__pte_index_size);
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unsigned long __pmd_index_size;
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EXPORT_SYMBOL(__pmd_index_size);
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unsigned long __pud_index_size;
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EXPORT_SYMBOL(__pud_index_size);
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unsigned long __pgd_index_size;
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EXPORT_SYMBOL(__pgd_index_size);
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unsigned long __pud_cache_index;
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EXPORT_SYMBOL(__pud_cache_index);
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unsigned long __pte_table_size;
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EXPORT_SYMBOL(__pte_table_size);
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unsigned long __pmd_table_size;
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EXPORT_SYMBOL(__pmd_table_size);
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unsigned long __pud_table_size;
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EXPORT_SYMBOL(__pud_table_size);
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unsigned long __pgd_table_size;
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EXPORT_SYMBOL(__pgd_table_size);
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unsigned long __pmd_val_bits;
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EXPORT_SYMBOL(__pmd_val_bits);
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unsigned long __pud_val_bits;
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EXPORT_SYMBOL(__pud_val_bits);
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unsigned long __pgd_val_bits;
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EXPORT_SYMBOL(__pgd_val_bits);
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unsigned long __kernel_virt_start;
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EXPORT_SYMBOL(__kernel_virt_start);
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unsigned long __vmalloc_start;
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EXPORT_SYMBOL(__vmalloc_start);
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unsigned long __vmalloc_end;
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EXPORT_SYMBOL(__vmalloc_end);
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unsigned long __kernel_io_start;
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EXPORT_SYMBOL(__kernel_io_start);
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unsigned long __kernel_io_end;
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struct page *vmemmap;
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EXPORT_SYMBOL(vmemmap);
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unsigned long __pte_frag_nr;
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EXPORT_SYMBOL(__pte_frag_nr);
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unsigned long __pte_frag_size_shift;
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EXPORT_SYMBOL(__pte_frag_size_shift);
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#endif
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#ifndef __PAGETABLE_PUD_FOLDED
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/* 4 level page table */
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struct page *p4d_page(p4d_t p4d)
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{
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if (p4d_is_leaf(p4d)) {
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if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP))
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VM_WARN_ON(!p4d_huge(p4d));
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return pte_page(p4d_pte(p4d));
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}
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return virt_to_page(p4d_pgtable(p4d));
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}
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#endif
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struct page *pud_page(pud_t pud)
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{
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if (pud_is_leaf(pud)) {
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if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP))
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VM_WARN_ON(!pud_huge(pud));
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return pte_page(pud_pte(pud));
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}
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return virt_to_page(pud_pgtable(pud));
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}
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/*
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* For hugepage we have pfn in the pmd, we use PTE_RPN_SHIFT bits for flags
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* For PTE page, we have a PTE_FRAG_SIZE (4K) aligned virtual address.
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*/
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struct page *pmd_page(pmd_t pmd)
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{
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if (pmd_is_leaf(pmd)) {
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/*
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* vmalloc_to_page may be called on any vmap address (not only
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* vmalloc), and it uses pmd_page() etc., when huge vmap is
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* enabled so these checks can't be used.
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*/
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if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP))
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VM_WARN_ON(!(pmd_large(pmd) || pmd_huge(pmd)));
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return pte_page(pmd_pte(pmd));
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}
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return virt_to_page(pmd_page_vaddr(pmd));
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}
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#ifdef CONFIG_STRICT_KERNEL_RWX
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void mark_rodata_ro(void)
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{
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if (!mmu_has_feature(MMU_FTR_KERNEL_RO)) {
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pr_warn("Warning: Unable to mark rodata read only on this CPU.\n");
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return;
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}
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if (radix_enabled())
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radix__mark_rodata_ro();
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else
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hash__mark_rodata_ro();
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// mark_initmem_nx() should have already run by now
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ptdump_check_wx();
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}
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void mark_initmem_nx(void)
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{
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if (radix_enabled())
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radix__mark_initmem_nx();
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else
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hash__mark_initmem_nx();
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}
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#endif
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