Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/* 
 * 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 <asm-generic/mm_hooks.h>
 
#include "linux/sched.h"
#include "um_mmu.h"
 
#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 fs/aio.c. In the first case, for an
	 * exec, we don't need to do anything as we're called from userspace
	 * and thus going to use a new host PID. In the second, we're called
	 * from a kernel thread, and thus need to go doing the mmap's on the
	 * host. Since they're very expensive, we want to avoid that as far as
	 * possible.
	 */
	if (old != new && (current->flags & PF_BORROWED_MM))
		__switch_mm(&new->context.id);
}
 
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