forked from Minki/linux
e1858b2a21
Code Aurora Forum (CAF) is becoming a part of Linux Foundation Labs. Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/*
|
|
* 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
|