174 строки
4.2 KiB
C
174 строки
4.2 KiB
C
/*
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* This file contains the routines for TLB flushing.
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* On machines where the MMU uses a hash table to store virtual to
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* physical translations, these routines flush entries from the
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* hash table also.
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* -- paulus
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*
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* Derived from arch/ppc/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@cs.anu.edu.au)
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include <linux/export.h>
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#include <asm/tlbflush.h>
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#include <asm/tlb.h>
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#include "mmu_decl.h"
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/*
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* Called when unmapping pages to flush entries from the TLB/hash table.
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*/
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void flush_hash_entry(struct mm_struct *mm, pte_t *ptep, unsigned long addr)
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{
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unsigned long ptephys;
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if (Hash) {
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ptephys = __pa(ptep) & PAGE_MASK;
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flush_hash_pages(mm->context.id, addr, ptephys, 1);
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}
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}
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EXPORT_SYMBOL(flush_hash_entry);
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/*
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* Called at the end of a mmu_gather operation to make sure the
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* TLB flush is completely done.
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*/
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void tlb_flush(struct mmu_gather *tlb)
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{
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if (!Hash) {
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/*
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* 603 needs to flush the whole TLB here since
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* it doesn't use a hash table.
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*/
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_tlbia();
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}
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}
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/*
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* TLB flushing:
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*
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* - flush_tlb_mm(mm) flushes the specified mm context TLB's
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* - flush_tlb_page(vma, vmaddr) flushes one page
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* - flush_tlb_range(vma, start, end) flushes a range of pages
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* - flush_tlb_kernel_range(start, end) flushes kernel pages
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*
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* since the hardware hash table functions as an extension of the
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* tlb as far as the linux tables are concerned, flush it too.
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* -- Cort
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*/
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static void flush_range(struct mm_struct *mm, unsigned long start,
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unsigned long end)
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{
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pmd_t *pmd;
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unsigned long pmd_end;
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int count;
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unsigned int ctx = mm->context.id;
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if (!Hash) {
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_tlbia();
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return;
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}
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start &= PAGE_MASK;
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if (start >= end)
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return;
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end = (end - 1) | ~PAGE_MASK;
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pmd = pmd_offset(pud_offset(pgd_offset(mm, start), start), start);
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for (;;) {
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pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1;
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if (pmd_end > end)
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pmd_end = end;
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if (!pmd_none(*pmd)) {
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count = ((pmd_end - start) >> PAGE_SHIFT) + 1;
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flush_hash_pages(ctx, start, pmd_val(*pmd), count);
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}
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if (pmd_end == end)
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break;
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start = pmd_end + 1;
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++pmd;
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}
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}
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/*
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* Flush kernel TLB entries in the given range
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*/
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void flush_tlb_kernel_range(unsigned long start, unsigned long end)
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{
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flush_range(&init_mm, start, end);
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}
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EXPORT_SYMBOL(flush_tlb_kernel_range);
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/*
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* Flush all the (user) entries for the address space described by mm.
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*/
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void flush_tlb_mm(struct mm_struct *mm)
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{
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struct vm_area_struct *mp;
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if (!Hash) {
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_tlbia();
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return;
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}
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/*
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* It is safe to go down the mm's list of vmas when called
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* from dup_mmap, holding mmap_sem. It would also be safe from
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* unmap_region or exit_mmap, but not from vmtruncate on SMP -
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* but it seems dup_mmap is the only SMP case which gets here.
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*/
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for (mp = mm->mmap; mp != NULL; mp = mp->vm_next)
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flush_range(mp->vm_mm, mp->vm_start, mp->vm_end);
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}
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EXPORT_SYMBOL(flush_tlb_mm);
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void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
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{
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struct mm_struct *mm;
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pmd_t *pmd;
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if (!Hash) {
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_tlbie(vmaddr);
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return;
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}
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mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
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pmd = pmd_offset(pud_offset(pgd_offset(mm, vmaddr), vmaddr), vmaddr);
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if (!pmd_none(*pmd))
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flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1);
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}
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EXPORT_SYMBOL(flush_tlb_page);
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/*
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* For each address in the range, find the pte for the address
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* and check _PAGE_HASHPTE bit; if it is set, find and destroy
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* the corresponding HPTE.
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*/
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void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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flush_range(vma->vm_mm, start, end);
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}
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EXPORT_SYMBOL(flush_tlb_range);
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void __init early_init_mmu(void)
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{
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}
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