acpi_pad: build only on X86
[linux-2.6/linux-acpi-2.6.git] / arch / powerpc / mm / tlb_hash32.c
blob65190587a365056cb35ce04aebc41d9dc1fb7cd1
1 /*
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
5 * hash table also.
6 * -- paulus
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
15 * Derived from "arch/i386/mm/init.c"
16 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
25 #include <linux/kernel.h>
26 #include <linux/mm.h>
27 #include <linux/init.h>
28 #include <linux/highmem.h>
29 #include <linux/pagemap.h>
31 #include <asm/tlbflush.h>
32 #include <asm/tlb.h>
34 #include "mmu_decl.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;
43 if (Hash != 0) {
44 ptephys = __pa(ptep) & PAGE_MASK;
45 flush_hash_pages(mm->context.id, addr, ptephys, 1);
48 EXPORT_SYMBOL(flush_hash_entry);
51 * Called by ptep_set_access_flags, must flush on CPUs for which the
52 * DSI handler can't just "fixup" the TLB on a write fault
54 void flush_tlb_page_nohash(struct vm_area_struct *vma, unsigned long addr)
56 if (Hash != 0)
57 return;
58 _tlbie(addr);
62 * Called at the end of a mmu_gather operation to make sure the
63 * TLB flush is completely done.
65 void tlb_flush(struct mmu_gather *tlb)
67 if (Hash == 0) {
69 * 603 needs to flush the whole TLB here since
70 * it doesn't use a hash table.
72 _tlbia();
77 * TLB flushing:
79 * - flush_tlb_mm(mm) flushes the specified mm context TLB's
80 * - flush_tlb_page(vma, vmaddr) flushes one page
81 * - flush_tlb_range(vma, start, end) flushes a range of pages
82 * - flush_tlb_kernel_range(start, end) flushes kernel pages
84 * since the hardware hash table functions as an extension of the
85 * tlb as far as the linux tables are concerned, flush it too.
86 * -- Cort
90 * 750 SMP is a Bad Idea because the 750 doesn't broadcast all
91 * the cache operations on the bus. Hence we need to use an IPI
92 * to get the other CPU(s) to invalidate their TLBs.
94 #ifdef CONFIG_SMP_750
95 #define FINISH_FLUSH smp_send_tlb_invalidate(0)
96 #else
97 #define FINISH_FLUSH do { } while (0)
98 #endif
100 static void flush_range(struct mm_struct *mm, unsigned long start,
101 unsigned long end)
103 pmd_t *pmd;
104 unsigned long pmd_end;
105 int count;
106 unsigned int ctx = mm->context.id;
108 if (Hash == 0) {
109 _tlbia();
110 return;
112 start &= PAGE_MASK;
113 if (start >= end)
114 return;
115 end = (end - 1) | ~PAGE_MASK;
116 pmd = pmd_offset(pud_offset(pgd_offset(mm, start), start), start);
117 for (;;) {
118 pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1;
119 if (pmd_end > end)
120 pmd_end = end;
121 if (!pmd_none(*pmd)) {
122 count = ((pmd_end - start) >> PAGE_SHIFT) + 1;
123 flush_hash_pages(ctx, start, pmd_val(*pmd), count);
125 if (pmd_end == end)
126 break;
127 start = pmd_end + 1;
128 ++pmd;
133 * Flush kernel TLB entries in the given range
135 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
137 flush_range(&init_mm, start, end);
138 FINISH_FLUSH;
140 EXPORT_SYMBOL(flush_tlb_kernel_range);
143 * Flush all the (user) entries for the address space described by mm.
145 void flush_tlb_mm(struct mm_struct *mm)
147 struct vm_area_struct *mp;
149 if (Hash == 0) {
150 _tlbia();
151 return;
155 * It is safe to go down the mm's list of vmas when called
156 * from dup_mmap, holding mmap_sem. It would also be safe from
157 * unmap_region or exit_mmap, but not from vmtruncate on SMP -
158 * but it seems dup_mmap is the only SMP case which gets here.
160 for (mp = mm->mmap; mp != NULL; mp = mp->vm_next)
161 flush_range(mp->vm_mm, mp->vm_start, mp->vm_end);
162 FINISH_FLUSH;
164 EXPORT_SYMBOL(flush_tlb_mm);
166 void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
168 struct mm_struct *mm;
169 pmd_t *pmd;
171 if (Hash == 0) {
172 _tlbie(vmaddr);
173 return;
175 mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
176 pmd = pmd_offset(pud_offset(pgd_offset(mm, vmaddr), vmaddr), vmaddr);
177 if (!pmd_none(*pmd))
178 flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1);
179 FINISH_FLUSH;
181 EXPORT_SYMBOL(flush_tlb_page);
184 * For each address in the range, find the pte for the address
185 * and check _PAGE_HASHPTE bit; if it is set, find and destroy
186 * the corresponding HPTE.
188 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
189 unsigned long end)
191 flush_range(vma->vm_mm, start, end);
192 FINISH_FLUSH;
194 EXPORT_SYMBOL(flush_tlb_range);