LXR linux/arch/um/include/asm/mmu

   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
  12extern void uml_setup_stubs(struct mm_struct *mm);
  13/*
  14 * Needed since we do not use the asm-generic/mm_hooks.h:
  15 */
  16static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
  17{
  18        uml_setup_stubs(mm);
  19}
  20extern void arch_exit_mmap(struct mm_struct *mm);
  21static inline void arch_unmap(struct mm_struct *mm,
  22                        struct vm_area_struct *vma,
  23                        unsigned long start, unsigned long end)
  24{
  25}
  26static inline void arch_bprm_mm_init(struct mm_struct *mm,
  27                                     struct vm_area_struct *vma)
  28{
  29}
  30
  31static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
  32                bool write, bool execute, bool foreign)
  33{
  34        /* by default, allow everything */
  35        return true;
  36}
  37
  38static inline bool arch_pte_access_permitted(pte_t pte, bool write)
  39{
  40        /* by default, allow everything */
  41        return true;
  42}
  43
  44/*
  45 * end asm-generic/mm_hooks.h functions
  46 */
  47
  48#define deactivate_mm(tsk,mm)   do { } while (0)
  49
  50extern void force_flush_all(void);
  51
  52static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
  53{
  54        /*
  55         * This is called by fs/exec.c and sys_unshare()
  56         * when the new ->mm is used for the first time.
  57         */
  58        __switch_mm(&new->context.id);
  59        down_write(&new->mmap_sem);
  60        uml_setup_stubs(new);
  61        up_write(&new->mmap_sem);
  62}
  63
  64static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 
  65                             struct task_struct *tsk)
  66{
  67        unsigned cpu = smp_processor_id();
  68
  69        if(prev != next){
  70                cpumask_clear_cpu(cpu, mm_cpumask(prev));
  71                cpumask_set_cpu(cpu, mm_cpumask(next));
  72                if(next != &init_mm)
  73                        __switch_mm(&next->context.id);
  74        }
  75}
  76
  77static inline void enter_lazy_tlb(struct mm_struct *mm, 
  78                                  struct task_struct *tsk)
  79{
  80}
  81
  82extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
  83
  84extern void destroy_context(struct mm_struct *mm);
  85
  86#endif
  87