include/asm-arm/mmu_context.h

   1 /*
   2  *  linux/include/asm-arm/mmu_context.h
   3  *
   4  *  Copyright (C) 1996 Russell King.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Changelog:
  11  *   27-06-1996 RMK     Created
  12  */
  13 #ifndef __ASM_ARM_MMU_CONTEXT_H
  14 #define __ASM_ARM_MMU_CONTEXT_H
  15
  16 #include <asm/proc-fns.h>
  17
  18 #define init_new_context(tsk,mm)        0
  19 #define destroy_context(mm)             do { } while(0)
  20
  21 /*
  22  * This is called when "tsk" is about to enter lazy TLB mode.
  23  *
  24  * mm:  describes the currently active mm context
  25  * tsk: task which is entering lazy tlb
  26  * cpu: cpu number which is entering lazy tlb
  27  *
  28  * tsk->mm will be NULL
  29  */
  30 static inline void
  31 enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
  32 {
  33 }
  34
  35 /*
  36  * This is the actual mm switch as far as the scheduler
  37  * is concerned.  No registers are touched.  We avoid
  38  * calling the CPU specific function when the mm hasn't
  39  * actually changed.
  40  */
  41 static inline void
  42 switch_mm(struct mm_struct *prev, struct mm_struct *next,
  43           struct task_struct *tsk)
  44 {
  45         if (prev != next) {
  46                 cpu_switch_mm(next->pgd, next);
  47         }
  48 }
  49
  50 #define deactivate_mm(tsk,mm)   do { } while (0)
  51
  52 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
  53 {
  54         cpu_switch_mm(next->pgd, next);
  55 }
  56
  57 #endif