/*
* MM context support for the Hexagon architecture
*
* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/

#ifndef _ASM_MMU_CONTEXT_H
#define _ASM_MMU_CONTEXT_H

#include <asm/setup.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/mem-layout.h>

static inline void destroy_context(struct mm_struct *mm)
{
}

/*
* VM port hides all TLB management, so "lazy TLB" isn't very
* meaningful. Even for ports to architectures with visble TLBs,
* this is almost invariably a null function.
*/
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
{
}

/*
* Architecture-specific actions, if any, for memory map deactivation.
*/
static inline void deactivate_mm(struct task_struct *tsk,
struct mm_struct *mm)
{
}

/**
* init_new_context - initialize context related info for new mm_struct instance
* @tsk: pointer to a task struct
* @mm: pointer to a new mm struct
*/
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
/* mm->context is set up by pgd_alloc */
return 0;
}

/*
* Switch active mm context
*/
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
int l1;

/*
* For virtual machine, we have to update system map if it's been
* touched.
*/
if (next->context.generation < prev->context.generation) {
for (l1 = MIN_KERNEL_SEG; l1 <= max_kernel_seg; l1++)
next->pgd[l1] = init_mm.pgd[l1];

next->context.generation = prev->context.generation;
}

__vmnewmap((void *)next->context.ptbase);
}

/*
* Activate new memory map for task
*/
static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
unsigned long flags;

local_irq_save(flags);
switch_mm(prev, next, current_thread_info()->task);
local_irq_restore(flags);
}

/* Generic hooks for arch_dup_mmap and arch_exit_mmap */
#include <asm-generic/mm_hooks.h>

#endif