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/*
* BK Id: %F% %I% %G% %U% %#%
*/
/*
* This file contains the routines for TLB flushing.
* On machines where the MMU uses a hash table to store virtual to
* physical translations, these routines flush entries from the the
* hash table also.
* -- paulus
*
* Derived from arch/ppc/mm/init.c:
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
* and Cort Dougan (PReP) (cort@cs.nmt.edu)
* Copyright (C) 1996 Paul Mackerras
* Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
*
* Derived from "arch/i386/mm/init.c"
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/init.h>
#include "mmu_decl.h"
/*
* TLB flushing:
*
* - flush_tlb_all() flushes all processes TLBs
* - flush_tlb_mm(mm) flushes the specified mm context TLB's
* - flush_tlb_page(vma, vmaddr) flushes one page
* - flush_tlb_range(mm, start, end) flushes a range of pages
*
* since the hardware hash table functions as an extension of the
* tlb as far as the linux tables are concerned, flush it too.
* -- Cort
*/
/*
* Flush all tlb/hash table entries (except perhaps for those
* mapping RAM starting at PAGE_OFFSET, since they never change).
*/
void
local_flush_tlb_all(void)
{
/* aargh!!! */
/*
* Just flush the kernel part of the address space, that's
* all that the current callers of this require.
* Eventually I hope to persuade the powers that be that
* we can and should dispense with flush_tlb_all().
* -- paulus.
*/
local_flush_tlb_range(&init_mm, TASK_SIZE, ~0UL);
#ifdef CONFIG_SMP
smp_send_tlb_invalidate(0);
#endif /* CONFIG_SMP */
}
/*
* Flush all the (user) entries for the address space described
* by mm. We can't rely on mm->mmap describing all the entries
* that might be in the hash table.
*/
void
local_flush_tlb_mm(struct mm_struct *mm)
{
if (Hash == 0) {
_tlbia();
return;
}
if (mm->map_count) {
struct vm_area_struct *mp;
for (mp = mm->mmap; mp != NULL; mp = mp->vm_next)
local_flush_tlb_range(mm, mp->vm_start, mp->vm_end);
} else
local_flush_tlb_range(mm, 0, TASK_SIZE);
#ifdef CONFIG_SMP
smp_send_tlb_invalidate(0);
#endif
}
void
local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
{
struct mm_struct *mm;
pmd_t *pmd;
pte_t *pte;
if (Hash == 0) {
_tlbie(vmaddr);
return;
}
mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
pmd = pmd_offset(pgd_offset(mm, vmaddr), vmaddr);
if (!pmd_none(*pmd)) {
pte = pte_offset(pmd, vmaddr);
if (pte_val(*pte) & _PAGE_HASHPTE)
flush_hash_page(mm->context, vmaddr, pte);
}
#ifdef CONFIG_SMP
smp_send_tlb_invalidate(0);
#endif
}
/*
* For each address in the range, find the pte for the address
* and check _PAGE_HASHPTE bit; if it is set, find and destroy
* the corresponding HPTE.
*/
void
local_flush_tlb_range(struct mm_struct *mm, unsigned long start, unsigned long end)
{
pmd_t *pmd;
pte_t *pte;
unsigned long pmd_end;
unsigned int ctx = mm->context;
if (Hash == 0) {
_tlbia();
return;
}
start &= PAGE_MASK;
if (start >= end)
return;
pmd = pmd_offset(pgd_offset(mm, start), start);
do {
pmd_end = (start + PGDIR_SIZE) & PGDIR_MASK;
if (!pmd_none(*pmd)) {
if (!pmd_end || pmd_end > end)
pmd_end = end;
pte = pte_offset(pmd, start);
do {
if ((pte_val(*pte) & _PAGE_HASHPTE) != 0)
flush_hash_page(ctx, start, pte);
start += PAGE_SIZE;
++pte;
} while (start && start < pmd_end);
} else {
start = pmd_end;
}
++pmd;
} while (start && start < end);
#ifdef CONFIG_SMP
smp_send_tlb_invalidate(0);
#endif
}
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