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https://github.com/edk2-porting/linux-next.git
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2f39b5f91e
Currently the .rodata section is actually still executable when DEBUG_RODATA is enabled. This changes that so the .rodata is actually read only, no execute. It also adds the .rodata section to the mem_init banner. Signed-off-by: Jeremy Linton <jeremy.linton@arm.com> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Mark Rutland <mark.rutland@arm.com> [catalin.marinas@arm.com: added vm_struct vmlinux_rodata in map_kernel()] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
852 lines
21 KiB
C
852 lines
21 KiB
C
/*
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* Based on arch/arm/mm/mmu.c
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*
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* Copyright (C) 1995-2005 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/libfdt.h>
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#include <linux/mman.h>
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#include <linux/nodemask.h>
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#include <linux/memblock.h>
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#include <linux/fs.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/stop_machine.h>
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#include <asm/barrier.h>
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#include <asm/cputype.h>
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#include <asm/fixmap.h>
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#include <asm/kasan.h>
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#include <asm/kernel-pgtable.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/sizes.h>
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#include <asm/tlb.h>
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#include <asm/memblock.h>
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#include <asm/mmu_context.h>
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#include "mm.h"
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u64 idmap_t0sz = TCR_T0SZ(VA_BITS);
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u64 kimage_voffset __read_mostly;
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EXPORT_SYMBOL(kimage_voffset);
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/*
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* Empty_zero_page is a special page that is used for zero-initialized data
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* and COW.
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*/
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unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
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EXPORT_SYMBOL(empty_zero_page);
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static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss;
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static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss __maybe_unused;
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static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss __maybe_unused;
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pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
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unsigned long size, pgprot_t vma_prot)
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{
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if (!pfn_valid(pfn))
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return pgprot_noncached(vma_prot);
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else if (file->f_flags & O_SYNC)
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return pgprot_writecombine(vma_prot);
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return vma_prot;
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}
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EXPORT_SYMBOL(phys_mem_access_prot);
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static phys_addr_t __init early_pgtable_alloc(void)
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{
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phys_addr_t phys;
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void *ptr;
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phys = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
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BUG_ON(!phys);
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/*
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* The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE
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* slot will be free, so we can (ab)use the FIX_PTE slot to initialise
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* any level of table.
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*/
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ptr = pte_set_fixmap(phys);
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memset(ptr, 0, PAGE_SIZE);
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/*
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* Implicit barriers also ensure the zeroed page is visible to the page
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* table walker
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*/
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pte_clear_fixmap();
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return phys;
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}
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/*
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* remap a PMD into pages
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*/
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static void split_pmd(pmd_t *pmd, pte_t *pte)
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{
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unsigned long pfn = pmd_pfn(*pmd);
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int i = 0;
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do {
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/*
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* Need to have the least restrictive permissions available
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* permissions will be fixed up later
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*/
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set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC));
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pfn++;
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} while (pte++, i++, i < PTRS_PER_PTE);
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}
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static void alloc_init_pte(pmd_t *pmd, unsigned long addr,
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unsigned long end, unsigned long pfn,
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pgprot_t prot,
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phys_addr_t (*pgtable_alloc)(void))
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{
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pte_t *pte;
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if (pmd_none(*pmd) || pmd_sect(*pmd)) {
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phys_addr_t pte_phys;
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BUG_ON(!pgtable_alloc);
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pte_phys = pgtable_alloc();
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pte = pte_set_fixmap(pte_phys);
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if (pmd_sect(*pmd))
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split_pmd(pmd, pte);
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__pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE);
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flush_tlb_all();
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pte_clear_fixmap();
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}
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BUG_ON(pmd_bad(*pmd));
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pte = pte_set_fixmap_offset(pmd, addr);
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do {
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set_pte(pte, pfn_pte(pfn, prot));
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pfn++;
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} while (pte++, addr += PAGE_SIZE, addr != end);
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pte_clear_fixmap();
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}
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static void split_pud(pud_t *old_pud, pmd_t *pmd)
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{
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unsigned long addr = pud_pfn(*old_pud) << PAGE_SHIFT;
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pgprot_t prot = __pgprot(pud_val(*old_pud) ^ addr);
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int i = 0;
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do {
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set_pmd(pmd, __pmd(addr | pgprot_val(prot)));
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addr += PMD_SIZE;
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} while (pmd++, i++, i < PTRS_PER_PMD);
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}
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#ifdef CONFIG_DEBUG_PAGEALLOC
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static bool block_mappings_allowed(phys_addr_t (*pgtable_alloc)(void))
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{
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/*
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* If debug_page_alloc is enabled we must map the linear map
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* using pages. However, other mappings created by
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* create_mapping_noalloc must use sections in some cases. Allow
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* sections to be used in those cases, where no pgtable_alloc
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* function is provided.
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*/
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return !pgtable_alloc || !debug_pagealloc_enabled();
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}
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#else
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static bool block_mappings_allowed(phys_addr_t (*pgtable_alloc)(void))
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{
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return true;
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}
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#endif
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static void alloc_init_pmd(pud_t *pud, unsigned long addr, unsigned long end,
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phys_addr_t phys, pgprot_t prot,
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phys_addr_t (*pgtable_alloc)(void))
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{
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pmd_t *pmd;
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unsigned long next;
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/*
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* Check for initial section mappings in the pgd/pud and remove them.
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*/
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if (pud_none(*pud) || pud_sect(*pud)) {
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phys_addr_t pmd_phys;
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BUG_ON(!pgtable_alloc);
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pmd_phys = pgtable_alloc();
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pmd = pmd_set_fixmap(pmd_phys);
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if (pud_sect(*pud)) {
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/*
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* need to have the 1G of mappings continue to be
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* present
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*/
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split_pud(pud, pmd);
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}
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__pud_populate(pud, pmd_phys, PUD_TYPE_TABLE);
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flush_tlb_all();
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pmd_clear_fixmap();
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}
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BUG_ON(pud_bad(*pud));
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pmd = pmd_set_fixmap_offset(pud, addr);
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do {
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next = pmd_addr_end(addr, end);
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/* try section mapping first */
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if (((addr | next | phys) & ~SECTION_MASK) == 0 &&
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block_mappings_allowed(pgtable_alloc)) {
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pmd_t old_pmd =*pmd;
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set_pmd(pmd, __pmd(phys |
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pgprot_val(mk_sect_prot(prot))));
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/*
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* Check for previous table entries created during
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* boot (__create_page_tables) and flush them.
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*/
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if (!pmd_none(old_pmd)) {
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flush_tlb_all();
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if (pmd_table(old_pmd)) {
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phys_addr_t table = pmd_page_paddr(old_pmd);
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if (!WARN_ON_ONCE(slab_is_available()))
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memblock_free(table, PAGE_SIZE);
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}
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}
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} else {
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alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys),
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prot, pgtable_alloc);
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}
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phys += next - addr;
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} while (pmd++, addr = next, addr != end);
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pmd_clear_fixmap();
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}
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static inline bool use_1G_block(unsigned long addr, unsigned long next,
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unsigned long phys)
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{
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if (PAGE_SHIFT != 12)
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return false;
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if (((addr | next | phys) & ~PUD_MASK) != 0)
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return false;
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return true;
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}
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static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
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phys_addr_t phys, pgprot_t prot,
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phys_addr_t (*pgtable_alloc)(void))
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{
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pud_t *pud;
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unsigned long next;
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if (pgd_none(*pgd)) {
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phys_addr_t pud_phys;
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BUG_ON(!pgtable_alloc);
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pud_phys = pgtable_alloc();
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__pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE);
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}
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BUG_ON(pgd_bad(*pgd));
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pud = pud_set_fixmap_offset(pgd, addr);
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do {
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next = pud_addr_end(addr, end);
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/*
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* For 4K granule only, attempt to put down a 1GB block
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*/
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if (use_1G_block(addr, next, phys) &&
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block_mappings_allowed(pgtable_alloc)) {
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pud_t old_pud = *pud;
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set_pud(pud, __pud(phys |
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pgprot_val(mk_sect_prot(prot))));
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/*
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* If we have an old value for a pud, it will
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* be pointing to a pmd table that we no longer
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* need (from swapper_pg_dir).
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*
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* Look up the old pmd table and free it.
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*/
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if (!pud_none(old_pud)) {
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flush_tlb_all();
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if (pud_table(old_pud)) {
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phys_addr_t table = pud_page_paddr(old_pud);
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if (!WARN_ON_ONCE(slab_is_available()))
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memblock_free(table, PAGE_SIZE);
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}
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}
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} else {
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alloc_init_pmd(pud, addr, next, phys, prot,
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pgtable_alloc);
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}
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phys += next - addr;
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} while (pud++, addr = next, addr != end);
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pud_clear_fixmap();
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}
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/*
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* Create the page directory entries and any necessary page tables for the
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* mapping specified by 'md'.
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*/
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static void init_pgd(pgd_t *pgd, phys_addr_t phys, unsigned long virt,
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phys_addr_t size, pgprot_t prot,
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phys_addr_t (*pgtable_alloc)(void))
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{
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unsigned long addr, length, end, next;
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/*
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* If the virtual and physical address don't have the same offset
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* within a page, we cannot map the region as the caller expects.
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*/
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if (WARN_ON((phys ^ virt) & ~PAGE_MASK))
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return;
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phys &= PAGE_MASK;
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addr = virt & PAGE_MASK;
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length = PAGE_ALIGN(size + (virt & ~PAGE_MASK));
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end = addr + length;
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do {
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next = pgd_addr_end(addr, end);
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alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc);
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phys += next - addr;
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} while (pgd++, addr = next, addr != end);
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}
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static phys_addr_t late_pgtable_alloc(void)
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{
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void *ptr = (void *)__get_free_page(PGALLOC_GFP);
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BUG_ON(!ptr);
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/* Ensure the zeroed page is visible to the page table walker */
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dsb(ishst);
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return __pa(ptr);
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}
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static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
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unsigned long virt, phys_addr_t size,
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pgprot_t prot,
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phys_addr_t (*alloc)(void))
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{
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init_pgd(pgd_offset_raw(pgdir, virt), phys, virt, size, prot, alloc);
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}
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/*
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* This function can only be used to modify existing table entries,
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* without allocating new levels of table. Note that this permits the
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* creation of new section or page entries.
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*/
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static void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt,
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phys_addr_t size, pgprot_t prot)
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{
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if (virt < VMALLOC_START) {
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pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n",
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&phys, virt);
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return;
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}
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__create_pgd_mapping(init_mm.pgd, phys, virt, size, prot,
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NULL);
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}
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void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
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unsigned long virt, phys_addr_t size,
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pgprot_t prot)
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{
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__create_pgd_mapping(mm->pgd, phys, virt, size, prot,
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late_pgtable_alloc);
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}
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static void create_mapping_late(phys_addr_t phys, unsigned long virt,
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phys_addr_t size, pgprot_t prot)
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{
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if (virt < VMALLOC_START) {
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pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n",
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&phys, virt);
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return;
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}
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__create_pgd_mapping(init_mm.pgd, phys, virt, size, prot,
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late_pgtable_alloc);
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}
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static void __init __map_memblock(pgd_t *pgd, phys_addr_t start, phys_addr_t end)
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{
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unsigned long kernel_start = __pa(_stext);
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unsigned long kernel_end = __pa(_etext);
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/*
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* Take care not to create a writable alias for the
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* read-only text and rodata sections of the kernel image.
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*/
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/* No overlap with the kernel text */
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if (end < kernel_start || start >= kernel_end) {
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__create_pgd_mapping(pgd, start, __phys_to_virt(start),
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end - start, PAGE_KERNEL,
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early_pgtable_alloc);
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return;
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}
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/*
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* This block overlaps the kernel text mapping.
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* Map the portion(s) which don't overlap.
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*/
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if (start < kernel_start)
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__create_pgd_mapping(pgd, start,
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__phys_to_virt(start),
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kernel_start - start, PAGE_KERNEL,
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early_pgtable_alloc);
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if (kernel_end < end)
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__create_pgd_mapping(pgd, kernel_end,
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__phys_to_virt(kernel_end),
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end - kernel_end, PAGE_KERNEL,
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early_pgtable_alloc);
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/*
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* Map the linear alias of the [_stext, _etext) interval as
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* read-only/non-executable. This makes the contents of the
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* region accessible to subsystems such as hibernate, but
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* protects it from inadvertent modification or execution.
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*/
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__create_pgd_mapping(pgd, kernel_start, __phys_to_virt(kernel_start),
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kernel_end - kernel_start, PAGE_KERNEL_RO,
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early_pgtable_alloc);
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}
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static void __init map_mem(pgd_t *pgd)
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{
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struct memblock_region *reg;
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/* map all the memory banks */
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for_each_memblock(memory, reg) {
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phys_addr_t start = reg->base;
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phys_addr_t end = start + reg->size;
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if (start >= end)
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break;
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if (memblock_is_nomap(reg))
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continue;
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__map_memblock(pgd, start, end);
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}
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}
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void mark_rodata_ro(void)
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{
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unsigned long section_size;
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section_size = (unsigned long)__start_rodata - (unsigned long)_stext;
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create_mapping_late(__pa(_stext), (unsigned long)_stext,
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section_size, PAGE_KERNEL_ROX);
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/*
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* mark .rodata as read only. Use _etext rather than __end_rodata to
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* cover NOTES and EXCEPTION_TABLE.
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*/
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section_size = (unsigned long)_etext - (unsigned long)__start_rodata;
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create_mapping_late(__pa(__start_rodata), (unsigned long)__start_rodata,
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section_size, PAGE_KERNEL_RO);
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}
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void fixup_init(void)
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{
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/*
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* Unmap the __init region but leave the VM area in place. This
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* prevents the region from being reused for kernel modules, which
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* is not supported by kallsyms.
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*/
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unmap_kernel_range((u64)__init_begin, (u64)(__init_end - __init_begin));
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}
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static void __init map_kernel_chunk(pgd_t *pgd, void *va_start, void *va_end,
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pgprot_t prot, struct vm_struct *vma)
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{
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phys_addr_t pa_start = __pa(va_start);
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unsigned long size = va_end - va_start;
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BUG_ON(!PAGE_ALIGNED(pa_start));
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BUG_ON(!PAGE_ALIGNED(size));
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__create_pgd_mapping(pgd, pa_start, (unsigned long)va_start, size, prot,
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early_pgtable_alloc);
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vma->addr = va_start;
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vma->phys_addr = pa_start;
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vma->size = size;
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vma->flags = VM_MAP;
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vma->caller = __builtin_return_address(0);
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vm_area_add_early(vma);
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}
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/*
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* Create fine-grained mappings for the kernel.
|
|
*/
|
|
static void __init map_kernel(pgd_t *pgd)
|
|
{
|
|
static struct vm_struct vmlinux_text, vmlinux_rodata, vmlinux_init, vmlinux_data;
|
|
|
|
map_kernel_chunk(pgd, _stext, __start_rodata, PAGE_KERNEL_EXEC, &vmlinux_text);
|
|
map_kernel_chunk(pgd, __start_rodata, _etext, PAGE_KERNEL, &vmlinux_rodata);
|
|
map_kernel_chunk(pgd, __init_begin, __init_end, PAGE_KERNEL_EXEC,
|
|
&vmlinux_init);
|
|
map_kernel_chunk(pgd, _data, _end, PAGE_KERNEL, &vmlinux_data);
|
|
|
|
if (!pgd_val(*pgd_offset_raw(pgd, FIXADDR_START))) {
|
|
/*
|
|
* The fixmap falls in a separate pgd to the kernel, and doesn't
|
|
* live in the carveout for the swapper_pg_dir. We can simply
|
|
* re-use the existing dir for the fixmap.
|
|
*/
|
|
set_pgd(pgd_offset_raw(pgd, FIXADDR_START),
|
|
*pgd_offset_k(FIXADDR_START));
|
|
} else if (CONFIG_PGTABLE_LEVELS > 3) {
|
|
/*
|
|
* The fixmap shares its top level pgd entry with the kernel
|
|
* mapping. This can really only occur when we are running
|
|
* with 16k/4 levels, so we can simply reuse the pud level
|
|
* entry instead.
|
|
*/
|
|
BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
|
|
set_pud(pud_set_fixmap_offset(pgd, FIXADDR_START),
|
|
__pud(__pa(bm_pmd) | PUD_TYPE_TABLE));
|
|
pud_clear_fixmap();
|
|
} else {
|
|
BUG();
|
|
}
|
|
|
|
kasan_copy_shadow(pgd);
|
|
}
|
|
|
|
/*
|
|
* paging_init() sets up the page tables, initialises the zone memory
|
|
* maps and sets up the zero page.
|
|
*/
|
|
void __init paging_init(void)
|
|
{
|
|
phys_addr_t pgd_phys = early_pgtable_alloc();
|
|
pgd_t *pgd = pgd_set_fixmap(pgd_phys);
|
|
|
|
map_kernel(pgd);
|
|
map_mem(pgd);
|
|
|
|
/*
|
|
* We want to reuse the original swapper_pg_dir so we don't have to
|
|
* communicate the new address to non-coherent secondaries in
|
|
* secondary_entry, and so cpu_switch_mm can generate the address with
|
|
* adrp+add rather than a load from some global variable.
|
|
*
|
|
* To do this we need to go via a temporary pgd.
|
|
*/
|
|
cpu_replace_ttbr1(__va(pgd_phys));
|
|
memcpy(swapper_pg_dir, pgd, PAGE_SIZE);
|
|
cpu_replace_ttbr1(swapper_pg_dir);
|
|
|
|
pgd_clear_fixmap();
|
|
memblock_free(pgd_phys, PAGE_SIZE);
|
|
|
|
/*
|
|
* We only reuse the PGD from the swapper_pg_dir, not the pud + pmd
|
|
* allocated with it.
|
|
*/
|
|
memblock_free(__pa(swapper_pg_dir) + PAGE_SIZE,
|
|
SWAPPER_DIR_SIZE - PAGE_SIZE);
|
|
|
|
bootmem_init();
|
|
}
|
|
|
|
/*
|
|
* Check whether a kernel address is valid (derived from arch/x86/).
|
|
*/
|
|
int kern_addr_valid(unsigned long addr)
|
|
{
|
|
pgd_t *pgd;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
pte_t *pte;
|
|
|
|
if ((((long)addr) >> VA_BITS) != -1UL)
|
|
return 0;
|
|
|
|
pgd = pgd_offset_k(addr);
|
|
if (pgd_none(*pgd))
|
|
return 0;
|
|
|
|
pud = pud_offset(pgd, addr);
|
|
if (pud_none(*pud))
|
|
return 0;
|
|
|
|
if (pud_sect(*pud))
|
|
return pfn_valid(pud_pfn(*pud));
|
|
|
|
pmd = pmd_offset(pud, addr);
|
|
if (pmd_none(*pmd))
|
|
return 0;
|
|
|
|
if (pmd_sect(*pmd))
|
|
return pfn_valid(pmd_pfn(*pmd));
|
|
|
|
pte = pte_offset_kernel(pmd, addr);
|
|
if (pte_none(*pte))
|
|
return 0;
|
|
|
|
return pfn_valid(pte_pfn(*pte));
|
|
}
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
|
#if !ARM64_SWAPPER_USES_SECTION_MAPS
|
|
int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
|
|
{
|
|
return vmemmap_populate_basepages(start, end, node);
|
|
}
|
|
#else /* !ARM64_SWAPPER_USES_SECTION_MAPS */
|
|
int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
|
|
{
|
|
unsigned long addr = start;
|
|
unsigned long next;
|
|
pgd_t *pgd;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
|
|
do {
|
|
next = pmd_addr_end(addr, end);
|
|
|
|
pgd = vmemmap_pgd_populate(addr, node);
|
|
if (!pgd)
|
|
return -ENOMEM;
|
|
|
|
pud = vmemmap_pud_populate(pgd, addr, node);
|
|
if (!pud)
|
|
return -ENOMEM;
|
|
|
|
pmd = pmd_offset(pud, addr);
|
|
if (pmd_none(*pmd)) {
|
|
void *p = NULL;
|
|
|
|
p = vmemmap_alloc_block_buf(PMD_SIZE, node);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL));
|
|
} else
|
|
vmemmap_verify((pte_t *)pmd, node, addr, next);
|
|
} while (addr = next, addr != end);
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_ARM64_64K_PAGES */
|
|
void vmemmap_free(unsigned long start, unsigned long end)
|
|
{
|
|
}
|
|
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
|
|
|
|
static inline pud_t * fixmap_pud(unsigned long addr)
|
|
{
|
|
pgd_t *pgd = pgd_offset_k(addr);
|
|
|
|
BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd));
|
|
|
|
return pud_offset_kimg(pgd, addr);
|
|
}
|
|
|
|
static inline pmd_t * fixmap_pmd(unsigned long addr)
|
|
{
|
|
pud_t *pud = fixmap_pud(addr);
|
|
|
|
BUG_ON(pud_none(*pud) || pud_bad(*pud));
|
|
|
|
return pmd_offset_kimg(pud, addr);
|
|
}
|
|
|
|
static inline pte_t * fixmap_pte(unsigned long addr)
|
|
{
|
|
return &bm_pte[pte_index(addr)];
|
|
}
|
|
|
|
void __init early_fixmap_init(void)
|
|
{
|
|
pgd_t *pgd;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
unsigned long addr = FIXADDR_START;
|
|
|
|
pgd = pgd_offset_k(addr);
|
|
if (CONFIG_PGTABLE_LEVELS > 3 &&
|
|
!(pgd_none(*pgd) || pgd_page_paddr(*pgd) == __pa(bm_pud))) {
|
|
/*
|
|
* We only end up here if the kernel mapping and the fixmap
|
|
* share the top level pgd entry, which should only happen on
|
|
* 16k/4 levels configurations.
|
|
*/
|
|
BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
|
|
pud = pud_offset_kimg(pgd, addr);
|
|
} else {
|
|
pgd_populate(&init_mm, pgd, bm_pud);
|
|
pud = fixmap_pud(addr);
|
|
}
|
|
pud_populate(&init_mm, pud, bm_pmd);
|
|
pmd = fixmap_pmd(addr);
|
|
pmd_populate_kernel(&init_mm, pmd, bm_pte);
|
|
|
|
/*
|
|
* The boot-ioremap range spans multiple pmds, for which
|
|
* we are not prepared:
|
|
*/
|
|
BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
|
|
!= (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
|
|
|
|
if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)))
|
|
|| pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) {
|
|
WARN_ON(1);
|
|
pr_warn("pmd %p != %p, %p\n",
|
|
pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)),
|
|
fixmap_pmd(fix_to_virt(FIX_BTMAP_END)));
|
|
pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
|
|
fix_to_virt(FIX_BTMAP_BEGIN));
|
|
pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
|
|
fix_to_virt(FIX_BTMAP_END));
|
|
|
|
pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
|
|
pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
|
|
}
|
|
}
|
|
|
|
void __set_fixmap(enum fixed_addresses idx,
|
|
phys_addr_t phys, pgprot_t flags)
|
|
{
|
|
unsigned long addr = __fix_to_virt(idx);
|
|
pte_t *pte;
|
|
|
|
BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
|
|
|
|
pte = fixmap_pte(addr);
|
|
|
|
if (pgprot_val(flags)) {
|
|
set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
|
|
} else {
|
|
pte_clear(&init_mm, addr, pte);
|
|
flush_tlb_kernel_range(addr, addr+PAGE_SIZE);
|
|
}
|
|
}
|
|
|
|
void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
|
|
{
|
|
const u64 dt_virt_base = __fix_to_virt(FIX_FDT);
|
|
int offset;
|
|
void *dt_virt;
|
|
|
|
/*
|
|
* Check whether the physical FDT address is set and meets the minimum
|
|
* alignment requirement. Since we are relying on MIN_FDT_ALIGN to be
|
|
* at least 8 bytes so that we can always access the size field of the
|
|
* FDT header after mapping the first chunk, double check here if that
|
|
* is indeed the case.
|
|
*/
|
|
BUILD_BUG_ON(MIN_FDT_ALIGN < 8);
|
|
if (!dt_phys || dt_phys % MIN_FDT_ALIGN)
|
|
return NULL;
|
|
|
|
/*
|
|
* Make sure that the FDT region can be mapped without the need to
|
|
* allocate additional translation table pages, so that it is safe
|
|
* to call create_mapping_noalloc() this early.
|
|
*
|
|
* On 64k pages, the FDT will be mapped using PTEs, so we need to
|
|
* be in the same PMD as the rest of the fixmap.
|
|
* On 4k pages, we'll use section mappings for the FDT so we only
|
|
* have to be in the same PUD.
|
|
*/
|
|
BUILD_BUG_ON(dt_virt_base % SZ_2M);
|
|
|
|
BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT !=
|
|
__fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT);
|
|
|
|
offset = dt_phys % SWAPPER_BLOCK_SIZE;
|
|
dt_virt = (void *)dt_virt_base + offset;
|
|
|
|
/* map the first chunk so we can read the size from the header */
|
|
create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE),
|
|
dt_virt_base, SWAPPER_BLOCK_SIZE, prot);
|
|
|
|
if (fdt_check_header(dt_virt) != 0)
|
|
return NULL;
|
|
|
|
*size = fdt_totalsize(dt_virt);
|
|
if (*size > MAX_FDT_SIZE)
|
|
return NULL;
|
|
|
|
if (offset + *size > SWAPPER_BLOCK_SIZE)
|
|
create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base,
|
|
round_up(offset + *size, SWAPPER_BLOCK_SIZE), prot);
|
|
|
|
return dt_virt;
|
|
}
|
|
|
|
void *__init fixmap_remap_fdt(phys_addr_t dt_phys)
|
|
{
|
|
void *dt_virt;
|
|
int size;
|
|
|
|
dt_virt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
|
|
if (!dt_virt)
|
|
return NULL;
|
|
|
|
memblock_reserve(dt_phys, size);
|
|
return dt_virt;
|
|
}
|
|
|
|
int __init arch_ioremap_pud_supported(void)
|
|
{
|
|
/* only 4k granule supports level 1 block mappings */
|
|
return IS_ENABLED(CONFIG_ARM64_4K_PAGES);
|
|
}
|
|
|
|
int __init arch_ioremap_pmd_supported(void)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot)
|
|
{
|
|
BUG_ON(phys & ~PUD_MASK);
|
|
set_pud(pud, __pud(phys | PUD_TYPE_SECT | pgprot_val(mk_sect_prot(prot))));
|
|
return 1;
|
|
}
|
|
|
|
int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot)
|
|
{
|
|
BUG_ON(phys & ~PMD_MASK);
|
|
set_pmd(pmd, __pmd(phys | PMD_TYPE_SECT | pgprot_val(mk_sect_prot(prot))));
|
|
return 1;
|
|
}
|
|
|
|
int pud_clear_huge(pud_t *pud)
|
|
{
|
|
if (!pud_sect(*pud))
|
|
return 0;
|
|
pud_clear(pud);
|
|
return 1;
|
|
}
|
|
|
|
int pmd_clear_huge(pmd_t *pmd)
|
|
{
|
|
if (!pmd_sect(*pmd))
|
|
return 0;
|
|
pmd_clear(pmd);
|
|
return 1;
|
|
}
|