include/asm-arm/mmu_context.h

   1 /*
   2  * linux/include/asm-arm/mmu_context.h
   3  *
   4  * Copyright (c) 1996 Russell King.
   5  *
   6  * Changelog:
   7  *  27-06-1996  RMK     Created
   8  */
   9 #ifndef __ASM_ARM_MMU_CONTEXT_H
  10 #define __ASM_ARM_MMU_CONTEXT_H
  11
  12 #include <asm/bitops.h>
  13 #include <asm/pgtable.h>
  14 #include <asm/arch/memory.h>
  15 #include <asm/proc-fns.h>
  16
  17 #define destroy_context(mm)             do { } while(0)
  18 #define init_new_context(tsk,mm)        0
  19
  20 /*
  21  * This is called when "tsk" is about to enter lazy TLB mode.
  22  *
  23  * mm:  describes the currently active mm context
  24  * tsk: task which is entering lazy tlb
  25  * cpu: cpu number which is entering lazy tlb
  26  *
  27  * tsk->mm will be NULL
  28  */
  29 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk, unsigned cpu)
  30 {
  31 }
  32
  33 /*
  34  * This is the actual mm switch as far as the scheduler
  35  * is concerned.  No registers are touched.
  36  */
  37 static inline void
  38 switch_mm(struct mm_struct *prev, struct mm_struct *next,
  39           struct task_struct *tsk, unsigned int cpu)
  40 {
  41         if (prev != next) {
  42                 cpu_switch_mm(next->pgd, tsk);
  43                 clear_bit(cpu, &prev->cpu_vm_mask);
  44         }
  45         set_bit(cpu, &next->cpu_vm_mask);
  46 }
  47
  48 #define activate_mm(prev, next) \
  49         switch_mm((prev),(next),NULL,smp_processor_id())
  50
  51 #endif