root/include/asm-um/mmu_context.h

INCLUDED FROM

DEFINITIONS

1. activate_mm
2. switch_mm
3. enter_lazy_tlb

/* 
 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#ifndef __UM_MMU_CONTEXT_H
#define __UM_MMU_CONTEXT_H

#include "linux/sched.h"
#include "um_mmu.h"

extern void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm);
extern void arch_exit_mmap(struct mm_struct *mm);

#define get_mmu_context(task) do ; while(0)
#define activate_context(tsk) do ; while(0)

#define deactivate_mm(tsk,mm)   do { } while (0)

extern void force_flush_all(void);

static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
{
        /*
         * This is called by fs/exec.c and sys_unshare()
         * when the new ->mm is used for the first time.
         */
        __switch_mm(&new->context.id);
        arch_dup_mmap(old, new);
}

static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 
                             struct task_struct *tsk)
{
        unsigned cpu = smp_processor_id();

        if(prev != next){
                cpu_clear(cpu, prev->cpu_vm_mask);
                cpu_set(cpu, next->cpu_vm_mask);
                if(next != &init_mm)
                        __switch_mm(&next->context.id);
        }
}

static inline void enter_lazy_tlb(struct mm_struct *mm, 
                                  struct task_struct *tsk)
{
}

extern int init_new_context(struct task_struct *task, struct mm_struct *mm);

extern void destroy_context(struct mm_struct *mm);

#endif