release/src-rt-6.x/linux/linux-2.6/include/asm-frv/mmu_context.h

   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
  20 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
  21 {
  22 }
  23
  24 #ifdef CONFIG_MMU
  25 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
  26 extern void change_mm_context(mm_context_t *old, mm_context_t *ctx, pgd_t *_pgd);
  27 extern 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)                                              \
  36 do {                                                                            \
  37         if (prev != next)                                                       \
  38                 change_mm_context(&prev->context, &next->context, next->pgd);   \
  39 } while(0)
  40
  41 #define activate_mm(prev, next)                                         \
  42 do {                                                                    \
  43         change_mm_context(&prev->context, &next->context, next->pgd);   \
  44 } while(0)
  45
  46 #define deactivate_mm(tsk, mm)                  \
  47 do {                                            \
  48 } while(0)
  49
  50 #endif