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 <linux/mm_types.h>
  11
  12 #include <asm/mmu.h>
  13
  14 extern void uml_setup_stubs(struct mm_struct *mm);
  15 /*
  16  * Needed since we do not use the asm-generic/mm_hooks.h:
  17  */
  18 static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
  19 {
  20         uml_setup_stubs(mm);
  21         return 0;
  22 }
  23 extern void arch_exit_mmap(struct mm_struct *mm);
  24 static inline void arch_unmap(struct mm_struct *mm,
  25                         struct vm_area_struct *vma,
  26                         unsigned long start, unsigned long end)
  27 {
  28 }
  29 static inline void arch_bprm_mm_init(struct mm_struct *mm,
  30                                      struct vm_area_struct *vma)
  31 {
  32 }
  33
  34 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
  35                 bool write, bool execute, bool foreign)
  36 {
  37         /* by default, allow everything */
  38         return true;
  39 }
  40
  41 /*
  42  * end asm-generic/mm_hooks.h functions
  43  */
  44
  45 #define deactivate_mm(tsk,mm)   do { } while (0)
  46
  47 extern void force_flush_all(void);
  48
  49 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
  50 {
  51         /*
  52          * This is called by fs/exec.c and sys_unshare()
  53          * when the new ->mm is used for the first time.
  54          */
  55         __switch_mm(&new->context.id);
  56         down_write(&new->mmap_sem);
  57         uml_setup_stubs(new);
  58         up_write(&new->mmap_sem);
  59 }
  60
  61 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  62                              struct task_struct *tsk)
  63 {
  64         unsigned cpu = smp_processor_id();
  65
  66         if(prev != next){
  67                 cpumask_clear_cpu(cpu, mm_cpumask(prev));
  68                 cpumask_set_cpu(cpu, mm_cpumask(next));
  69                 if(next != &init_mm)
  70                         __switch_mm(&next->context.id);
  71         }
  72 }
  73
  74 static inline void enter_lazy_tlb(struct mm_struct *mm,
  75                                   struct task_struct *tsk)
  76 {
  77 }
  78
  79 extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
  80
  81 extern void destroy_context(struct mm_struct *mm);
  82
  83 #endif