2 * This file contains the routines for TLB flushing.
3 * On machines where the MMU uses a hash table to store virtual to
4 * physical translations, these routines flush entries from the
8 * Derived from arch/ppc/mm/init.c:
9 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
11 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
12 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
13 * Copyright (C) 1996 Paul Mackerras
14 * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
16 * Derived from "arch/i386/mm/init.c"
17 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
19 * This program is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU General Public License
21 * as published by the Free Software Foundation; either version
22 * 2 of the License, or (at your option) any later version.
26 #include <linux/config.h>
27 #include <linux/kernel.h>
29 #include <linux/init.h>
30 #include <linux/highmem.h>
31 #include <asm/tlbflush.h>
37 * Called when unmapping pages to flush entries from the TLB/hash table.
39 void flush_hash_entry(struct mm_struct *mm, pte_t *ptep, unsigned long addr)
41 unsigned long ptephys;
44 ptephys = __pa(ptep) & PAGE_MASK;
45 flush_hash_pages(mm->context, addr, ptephys, 1);
50 * Called by ptep_test_and_clear_young()
52 void flush_hash_one_pte(pte_t *ptep)
56 unsigned long ptephys;
62 ptepage = virt_to_page(ptep);
63 mm = (struct mm_struct *) ptepage->mapping;
64 ptephys = __pa(ptep) & PAGE_MASK;
65 addr = ptepage->index + (((unsigned long)ptep & ~PAGE_MASK) << 9);
66 flush_hash_pages(mm->context, addr, ptephys, 1);
70 * Called at the end of a mmu_gather operation to make sure the
71 * TLB flush is completely done.
73 void tlb_flush(struct mmu_gather *tlb)
77 * 603 needs to flush the whole TLB here since
78 * it doesn't use a hash table.
87 * - flush_tlb_mm(mm) flushes the specified mm context TLB's
88 * - flush_tlb_page(vma, vmaddr) flushes one page
89 * - flush_tlb_range(vma, start, end) flushes a range of pages
90 * - flush_tlb_kernel_range(start, end) flushes kernel pages
92 * since the hardware hash table functions as an extension of the
93 * tlb as far as the linux tables are concerned, flush it too.
98 * 750 SMP is a Bad Idea because the 750 doesn't broadcast all
99 * the cache operations on the bus. Hence we need to use an IPI
100 * to get the other CPU(s) to invalidate their TLBs.
102 #ifdef CONFIG_SMP_750
103 #define FINISH_FLUSH smp_send_tlb_invalidate(0)
105 #define FINISH_FLUSH do { } while (0)
108 static void flush_range(struct mm_struct *mm, unsigned long start,
112 unsigned long pmd_end;
114 unsigned int ctx = mm->context;
123 end = (end - 1) | ~PAGE_MASK;
124 pmd = pmd_offset(pgd_offset(mm, start), start);
126 pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1;
129 if (!pmd_none(*pmd)) {
130 count = ((pmd_end - start) >> PAGE_SHIFT) + 1;
131 flush_hash_pages(ctx, start, pmd_val(*pmd), count);
141 * Flush kernel TLB entries in the given range
143 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
145 flush_range(&init_mm, start, end);
150 * Flush all the (user) entries for the address space described by mm.
152 void flush_tlb_mm(struct mm_struct *mm)
154 struct vm_area_struct *mp;
161 for (mp = mm->mmap; mp != NULL; mp = mp->vm_next)
162 flush_range(mp->vm_mm, mp->vm_start, mp->vm_end);
166 void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
168 struct mm_struct *mm;
175 mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
176 pmd = pmd_offset(pgd_offset(mm, vmaddr), vmaddr);
178 flush_hash_pages(mm->context, vmaddr, pmd_val(*pmd), 1);
183 * For each address in the range, find the pte for the address
184 * and check _PAGE_HASHPTE bit; if it is set, find and destroy
185 * the corresponding HPTE.
187 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
190 flush_range(vma->vm_mm, start, end);