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 "um_mmu.h"
  11
  12extern void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm);
  13extern 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
  20extern void force_flush_all(void);
  21
  22static 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
  32static 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
  45static inline void enter_lazy_tlb(struct mm_struct *mm, 
  46                                  struct task_struct *tsk)
  47{
  48}
  49
  50extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
  51
  52extern void destroy_context(struct mm_struct *mm);
  53
  54#endif
  55