arch/um/include/asm/mmu_context.h

   1 /*
   2  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #ifndef __UM_MMU_CONTEXT_H
   7 #define __UM_MMU_CONTEXT_H
   8
   9 #include "linux/sched.h"
  10 #include "um_mmu.h"
  11
  12 extern void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm);
  13 extern void arch_exit_mmap(struct mm_struct *mm);
  14
  15 #define get_mmu_context(task) do ; while(0)
  16 #define activate_context(tsk) do ; while(0)
  17
  18 #define deactivate_mm(tsk,mm)   do { } while (0)
  19
  20 extern void force_flush_all(void);
  21
  22 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
  23 {
  24         /*
  25          * This is called by fs/exec.c and sys_unshare()
  26          * when the new ->mm is used for the first time.
  27          */
  28         __switch_mm(&new->context.id);
  29         arch_dup_mmap(old, new);
  30 }
  31
  32 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  33                              struct task_struct *tsk)
  34 {
  35         unsigned cpu = smp_processor_id();
  36
  37         if(prev != next){
  38                 cpumask_clear_cpu(cpu, mm_cpumask(prev));
  39                 cpumask_set_cpu(cpu, mm_cpumask(next));
  40                 if(next != &init_mm)
  41                         __switch_mm(&next->context.id);
  42         }
  43 }
  44
  45 static inline void enter_lazy_tlb(struct mm_struct *mm,
  46                                   struct task_struct *tsk)
  47 {
  48 }
  49
  50 extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
  51
  52 extern void destroy_context(struct mm_struct *mm);
  53
  54 #endif