LXR linux/arch/nios2/include/asm/mmu

   1/*
   2 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
   3 * Copyright (C) 1996, 1997, 1998, 1999 by Ralf Baechle
   4 * Copyright (C) 1999 Silicon Graphics, Inc.
   5 *
   6 * based on MIPS asm/mmu_context.h
   7 *
   8 * This file is subject to the terms and conditions of the GNU General Public
   9 * License.  See the file "COPYING" in the main directory of this archive
  10 * for more details.
  11 */
  12
  13#ifndef _ASM_NIOS2_MMU_CONTEXT_H
  14#define _ASM_NIOS2_MMU_CONTEXT_H
  15
  16#include <linux/mm_types.h>
  17
  18#include <asm-generic/mm_hooks.h>
  19
  20extern void mmu_context_init(void);
  21extern unsigned long get_pid_from_context(mm_context_t *ctx);
  22
  23/*
  24 * For the fast tlb miss handlers, we keep a pointer to the current pgd.
  25 * processor.
  26 */
  27extern pgd_t *pgd_current;
  28
  29static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
  30{
  31}
  32
  33/*
  34 * Initialize the context related info for a new mm_struct instance.
  35 *
  36 * Set all new contexts to 0, that way the generation will never match
  37 * the currently running generation when this context is switched in.
  38 */
  39static inline int init_new_context(struct task_struct *tsk,
  40                                        struct mm_struct *mm)
  41{
  42        mm->context = 0;
  43        return 0;
  44}
  45
  46/*
  47 * Destroy context related info for an mm_struct that is about
  48 * to be put to rest.
  49 */
  50static inline void destroy_context(struct mm_struct *mm)
  51{
  52}
  53
  54void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  55                struct task_struct *tsk);
  56
  57static inline void deactivate_mm(struct task_struct *tsk,
  58                                struct mm_struct *mm)
  59{
  60}
  61
  62/*
  63 * After we have set current->mm to a new value, this activates
  64 * the context for the new mm so we see the new mappings.
  65 */
  66void activate_mm(struct mm_struct *prev, struct mm_struct *next);
  67
  68#endif /* _ASM_NIOS2_MMU_CONTEXT_H */
  69