LXR linux/arch/frv/include/asm/mmu

   1/* mmu_context.h: MMU context management routines
   2 *
   3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11
  12#ifndef _ASM_MMU_CONTEXT_H
  13#define _ASM_MMU_CONTEXT_H
  14
  15#include <asm/setup.h>
  16#include <asm/page.h>
  17#include <asm/pgalloc.h>
  18#include <asm-generic/mm_hooks.h>
  19
  20static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
  21{
  22}
  23
  24#ifdef CONFIG_MMU
  25extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
  26extern void change_mm_context(mm_context_t *old, mm_context_t *ctx, pgd_t *_pgd);
  27extern void destroy_context(struct mm_struct *mm);
  28
  29#else
  30#define init_new_context(tsk, mm)               ({ 0; })
  31#define change_mm_context(old, ctx, _pml4)      do {} while(0)
  32#define destroy_context(mm)                     do {} while(0)
  33#endif
  34
  35#define switch_mm(prev, next, tsk)                                              \
  36do {                                                                            \
  37        if (prev != next)                                                       \
  38                change_mm_context(&prev->context, &next->context, next->pgd);   \
  39} while(0)
  40
  41#define activate_mm(prev, next)                                         \
  42do {                                                                    \
  43        change_mm_context(&prev->context, &next->context, next->pgd);   \
  44} while(0)
  45
  46#define deactivate_mm(tsk, mm)                  \
  47do {                                            \
  48} while(0)
  49
  50#endif
  51