arch/nios2/include/asm/mmu_context.h

   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 <asm-generic/mm_hooks.h>
  17
  18 extern void mmu_context_init(void);
  19 extern unsigned long get_pid_from_context(mm_context_t *ctx);
  20
  21 /*
  22  * For the fast tlb miss handlers, we keep a pointer to the current pgd.
  23  * processor.
  24  */
  25 extern pgd_t *pgd_current;
  26
  27 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
  28 {
  29 }
  30
  31 /*
  32  * Initialize the context related info for a new mm_struct instance.
  33  *
  34  * Set all new contexts to 0, that way the generation will never match
  35  * the currently running generation when this context is switched in.
  36  */
  37 static inline int init_new_context(struct task_struct *tsk,
  38                                         struct mm_struct *mm)
  39 {
  40         mm->context = 0;
  41         return 0;
  42 }
  43
  44 /*
  45  * Destroy context related info for an mm_struct that is about
  46  * to be put to rest.
  47  */
  48 static inline void destroy_context(struct mm_struct *mm)
  49 {
  50 }
  51
  52 void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  53                 struct task_struct *tsk);
  54
  55 static inline void deactivate_mm(struct task_struct *tsk,
  56                                 struct mm_struct *mm)
  57 {
  58 }
  59
  60 /*
  61  * After we have set current->mm to a new value, this activates
  62  * the context for the new mm so we see the new mappings.
  63  */
  64 void activate_mm(struct mm_struct *prev, struct mm_struct *next);
  65
  66 #endif /* _ASM_NIOS2_MMU_CONTEXT_H */