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 /*
  14  * Needed since we do not use the asm-generic/mm_hooks.h:
  15  */
  16 static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
  17 {
  18         uml_setup_stubs(mm);
  19 }
  20 extern void arch_exit_mmap(struct mm_struct *mm);
  21 static inline void arch_unmap(struct mm_struct *mm,
  22                         struct vm_area_struct *vma,
  23                         unsigned long start, unsigned long end)
  24 {
  25 }
  26 static inline void arch_bprm_mm_init(struct mm_struct *mm,
  27                                      struct vm_area_struct *vma)
  28 {
  29 }
  30 /*
  31  * end asm-generic/mm_hooks.h functions
  32  */
  33
  34 #define deactivate_mm(tsk,mm)   do { } while (0)
  35
  36 extern void force_flush_all(void);
  37
  38 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
  39 {
  40         /*
  41          * This is called by fs/exec.c and sys_unshare()
  42          * when the new ->mm is used for the first time.
  43          */
  44         __switch_mm(&new->context.id);
  45         down_write(&new->mmap_sem);
  46         uml_setup_stubs(new);
  47         up_write(&new->mmap_sem);
  48 }
  49
  50 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  51                              struct task_struct *tsk)
  52 {
  53         unsigned cpu = smp_processor_id();
  54
  55         if(prev != next){
  56                 cpumask_clear_cpu(cpu, mm_cpumask(prev));
  57                 cpumask_set_cpu(cpu, mm_cpumask(next));
  58                 if(next != &init_mm)
  59                         __switch_mm(&next->context.id);
  60         }
  61 }
  62
  63 static inline void enter_lazy_tlb(struct mm_struct *mm,
  64                                   struct task_struct *tsk)
  65 {
  66 }
  67
  68 extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
  69
  70 extern void destroy_context(struct mm_struct *mm);
  71
  72 #endif