644 строки
16 KiB
C
644 строки
16 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/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/cputype.h>
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#include <asm/fixmap.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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/*
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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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struct page *empty_zero_page;
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EXPORT_SYMBOL(empty_zero_page);
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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 void __init *early_alloc(unsigned long sz)
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{
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void *ptr = __va(memblock_alloc(sz, sz));
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BUG_ON(!ptr);
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memset(ptr, 0, sz);
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return ptr;
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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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void *(*alloc)(unsigned long size))
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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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pte = alloc(PTRS_PER_PTE * sizeof(pte_t));
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if (pmd_sect(*pmd))
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split_pmd(pmd, pte);
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__pmd_populate(pmd, __pa(pte), PMD_TYPE_TABLE);
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flush_tlb_all();
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}
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BUG_ON(pmd_bad(*pmd));
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pte = pte_offset_kernel(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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}
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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 | 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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static void alloc_init_pmd(struct mm_struct *mm, pud_t *pud,
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unsigned long addr, unsigned long end,
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phys_addr_t phys, pgprot_t prot,
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void *(*alloc)(unsigned long size))
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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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pmd = alloc(PTRS_PER_PMD * sizeof(pmd_t));
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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(mm, pud, pmd);
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flush_tlb_all();
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}
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BUG_ON(pud_bad(*pud));
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pmd = pmd_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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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 = __pa(pte_offset_map(&old_pmd, 0));
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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, 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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}
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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(struct mm_struct *mm, pgd_t *pgd,
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unsigned long addr, unsigned long end,
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phys_addr_t phys, pgprot_t prot,
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void *(*alloc)(unsigned long size))
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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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pud = alloc(PTRS_PER_PUD * sizeof(pud_t));
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pgd_populate(mm, pgd, pud);
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}
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BUG_ON(pgd_bad(*pgd));
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pud = pud_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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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 = __pa(pmd_offset(&old_pud, 0));
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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(mm, pud, addr, next, phys, prot, 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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}
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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 __create_mapping(struct mm_struct *mm, pgd_t *pgd,
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phys_addr_t phys, unsigned long virt,
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phys_addr_t size, pgprot_t prot,
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void *(*alloc)(unsigned long size))
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{
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unsigned long addr, length, end, next;
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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(mm, pgd, addr, next, phys, prot, 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 void *late_alloc(unsigned long size)
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{
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void *ptr;
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BUG_ON(size > PAGE_SIZE);
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ptr = (void *)__get_free_page(PGALLOC_GFP);
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BUG_ON(!ptr);
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return ptr;
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}
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static void __ref create_mapping(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_mapping(&init_mm, pgd_offset_k(virt & PAGE_MASK), phys, virt,
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size, prot, early_alloc);
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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_mapping(mm, pgd_offset(mm, virt), phys, virt, size, prot,
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late_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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return __create_mapping(&init_mm, pgd_offset_k(virt & PAGE_MASK),
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phys, virt, size, prot, late_alloc);
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}
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#ifdef CONFIG_DEBUG_RODATA
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static void __init __map_memblock(phys_addr_t start, phys_addr_t end)
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{
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/*
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* Set up the executable regions using the existing section mappings
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* for now. This will get more fine grained later once all memory
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* is mapped
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*/
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unsigned long kernel_x_start = round_down(__pa(_stext), SECTION_SIZE);
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unsigned long kernel_x_end = round_up(__pa(__init_end), SECTION_SIZE);
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if (end < kernel_x_start) {
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create_mapping(start, __phys_to_virt(start),
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end - start, PAGE_KERNEL);
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} else if (start >= kernel_x_end) {
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create_mapping(start, __phys_to_virt(start),
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end - start, PAGE_KERNEL);
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} else {
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if (start < kernel_x_start)
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create_mapping(start, __phys_to_virt(start),
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kernel_x_start - start,
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PAGE_KERNEL);
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create_mapping(kernel_x_start,
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__phys_to_virt(kernel_x_start),
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kernel_x_end - kernel_x_start,
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PAGE_KERNEL_EXEC);
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if (kernel_x_end < end)
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create_mapping(kernel_x_end,
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__phys_to_virt(kernel_x_end),
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end - kernel_x_end,
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PAGE_KERNEL);
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}
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}
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#else
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static void __init __map_memblock(phys_addr_t start, phys_addr_t end)
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{
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create_mapping(start, __phys_to_virt(start), end - start,
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PAGE_KERNEL_EXEC);
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}
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#endif
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static void __init map_mem(void)
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{
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struct memblock_region *reg;
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phys_addr_t limit;
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/*
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* Temporarily limit the memblock range. We need to do this as
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* create_mapping requires puds, pmds and ptes to be allocated from
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* memory addressable from the initial direct kernel mapping.
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*
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* The initial direct kernel mapping, located at swapper_pg_dir, gives
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* us PUD_SIZE (4K pages) or PMD_SIZE (64K pages) memory starting from
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* PHYS_OFFSET (which must be aligned to 2MB as per
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* Documentation/arm64/booting.txt).
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*/
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if (IS_ENABLED(CONFIG_ARM64_64K_PAGES))
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limit = PHYS_OFFSET + PMD_SIZE;
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else
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limit = PHYS_OFFSET + PUD_SIZE;
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memblock_set_current_limit(limit);
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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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#ifndef CONFIG_ARM64_64K_PAGES
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/*
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* For the first memory bank align the start address and
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* current memblock limit to prevent create_mapping() from
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* allocating pte page tables from unmapped memory.
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* When 64K pages are enabled, the pte page table for the
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* first PGDIR_SIZE is already present in swapper_pg_dir.
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*/
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if (start < limit)
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start = ALIGN(start, PMD_SIZE);
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if (end < limit) {
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limit = end & PMD_MASK;
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memblock_set_current_limit(limit);
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}
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#endif
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__map_memblock(start, end);
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}
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/* Limit no longer required. */
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memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE);
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}
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void __init fixup_executable(void)
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{
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#ifdef CONFIG_DEBUG_RODATA
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/* now that we are actually fully mapped, make the start/end more fine grained */
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if (!IS_ALIGNED((unsigned long)_stext, SECTION_SIZE)) {
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unsigned long aligned_start = round_down(__pa(_stext),
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SECTION_SIZE);
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create_mapping(aligned_start, __phys_to_virt(aligned_start),
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__pa(_stext) - aligned_start,
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PAGE_KERNEL);
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}
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if (!IS_ALIGNED((unsigned long)__init_end, SECTION_SIZE)) {
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unsigned long aligned_end = round_up(__pa(__init_end),
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SECTION_SIZE);
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create_mapping(__pa(__init_end), (unsigned long)__init_end,
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aligned_end - __pa(__init_end),
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PAGE_KERNEL);
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}
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#endif
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}
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#ifdef CONFIG_DEBUG_RODATA
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void mark_rodata_ro(void)
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{
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create_mapping_late(__pa(_stext), (unsigned long)_stext,
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(unsigned long)_etext - (unsigned long)_stext,
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PAGE_KERNEL_EXEC | PTE_RDONLY);
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}
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#endif
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void fixup_init(void)
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{
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create_mapping_late(__pa(__init_begin), (unsigned long)__init_begin,
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(unsigned long)__init_end - (unsigned long)__init_begin,
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PAGE_KERNEL);
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}
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/*
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* paging_init() sets up the page tables, initialises the zone memory
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* maps and sets up the zero page.
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*/
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void __init paging_init(void)
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{
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void *zero_page;
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map_mem();
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fixup_executable();
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/* allocate the zero page. */
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zero_page = early_alloc(PAGE_SIZE);
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bootmem_init();
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empty_zero_page = virt_to_page(zero_page);
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/*
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* TTBR0 is only used for the identity mapping at this stage. Make it
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* point to zero page to avoid speculatively fetching new entries.
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*/
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cpu_set_reserved_ttbr0();
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flush_tlb_all();
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}
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/*
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* Enable the identity mapping to allow the MMU disabling.
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*/
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void setup_mm_for_reboot(void)
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{
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cpu_switch_mm(idmap_pg_dir, &init_mm);
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flush_tlb_all();
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}
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/*
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* Check whether a kernel address is valid (derived from arch/x86/).
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*/
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int kern_addr_valid(unsigned long addr)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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if ((((long)addr) >> VA_BITS) != -1UL)
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return 0;
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pgd = pgd_offset_k(addr);
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if (pgd_none(*pgd))
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return 0;
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pud = pud_offset(pgd, addr);
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if (pud_none(*pud))
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return 0;
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if (pud_sect(*pud))
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return pfn_valid(pud_pfn(*pud));
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pmd = pmd_offset(pud, addr);
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if (pmd_none(*pmd))
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return 0;
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if (pmd_sect(*pmd))
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return pfn_valid(pmd_pfn(*pmd));
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pte = pte_offset_kernel(pmd, addr);
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if (pte_none(*pte))
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return 0;
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return pfn_valid(pte_pfn(*pte));
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}
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#ifdef CONFIG_SPARSEMEM_VMEMMAP
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#ifdef CONFIG_ARM64_64K_PAGES
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int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
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{
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return vmemmap_populate_basepages(start, end, node);
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}
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#else /* !CONFIG_ARM64_64K_PAGES */
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int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
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{
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unsigned long addr = start;
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unsigned long next;
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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do {
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next = pmd_addr_end(addr, end);
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|
|
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 pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss;
|
|
#if CONFIG_PGTABLE_LEVELS > 2
|
|
static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss;
|
|
#endif
|
|
#if CONFIG_PGTABLE_LEVELS > 3
|
|
static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss;
|
|
#endif
|
|
|
|
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(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(pud, addr);
|
|
}
|
|
|
|
static inline pte_t * fixmap_pte(unsigned long addr)
|
|
{
|
|
pmd_t *pmd = fixmap_pmd(addr);
|
|
|
|
BUG_ON(pmd_none(*pmd) || pmd_bad(*pmd));
|
|
|
|
return pte_offset_kernel(pmd, 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);
|
|
pgd_populate(&init_mm, pgd, bm_pud);
|
|
pud = pud_offset(pgd, addr);
|
|
pud_populate(&init_mm, pud, bm_pmd);
|
|
pmd = pmd_offset(pud, addr);
|
|
pmd_populate_kernel(&init_mm, pmd, bm_pte);
|
|
|
|
/*
|
|
* The boot-ioremap range spans multiple pmds, for which
|
|
* we are not preparted:
|
|
*/
|
|
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;
|
|
|
|
if (idx >= __end_of_fixed_addresses) {
|
|
BUG();
|
|
return;
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|