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 <asm/mmu.h>
  11
  12 extern void uml_setup_stubs(struct mm_struct *mm);
  13 extern void arch_exit_mmap(struct mm_struct *mm);
  14
  15 #define deactivate_mm(tsk,mm)   do { } while (0)
  16
  17 extern void force_flush_all(void);
  18
  19 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
  20 {
  21         /*
  22          * This is called by fs/exec.c and sys_unshare()
  23          * when the new ->mm is used for the first time.
  24          */
  25         __switch_mm(&new->context.id);
  26         down_write(&new->mmap_sem);
  27         uml_setup_stubs(new);
  28         up_write(&new->mmap_sem);
  29 }
  30
  31 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  32                              struct task_struct *tsk)
  33 {
  34         unsigned cpu = smp_processor_id();
  35
  36         if(prev != next){
  37                 cpumask_clear_cpu(cpu, mm_cpumask(prev));
  38                 cpumask_set_cpu(cpu, mm_cpumask(next));
  39                 if(next != &init_mm)
  40                         __switch_mm(&next->context.id);
  41         }
  42 }
  43
  44 static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
  45 {
  46         uml_setup_stubs(mm);
  47 }
  48
  49 static inline void enter_lazy_tlb(struct mm_struct *mm,
  50                                   struct task_struct *tsk)
  51 {
  52 }
  53
  54 extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
  55
  56 extern void destroy_context(struct mm_struct *mm);
  57
  58 #endif