101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/*
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* MM context support for the Hexagon architecture
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*
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* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#ifndef _ASM_MMU_CONTEXT_H
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#define _ASM_MMU_CONTEXT_H
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/mem-layout.h>
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static inline void destroy_context(struct mm_struct *mm)
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{
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}
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/*
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* VM port hides all TLB management, so "lazy TLB" isn't very
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* meaningful. Even for ports to architectures with visble TLBs,
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* this is almost invariably a null function.
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*/
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static inline void enter_lazy_tlb(struct mm_struct *mm,
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struct task_struct *tsk)
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{
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}
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/*
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* Architecture-specific actions, if any, for memory map deactivation.
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*/
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static inline void deactivate_mm(struct task_struct *tsk,
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struct mm_struct *mm)
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{
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}
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/**
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* init_new_context - initialize context related info for new mm_struct instance
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* @tsk: pointer to a task struct
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* @mm: pointer to a new mm struct
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*/
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static inline int init_new_context(struct task_struct *tsk,
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struct mm_struct *mm)
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{
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/* mm->context is set up by pgd_alloc */
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return 0;
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}
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/*
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* Switch active mm context
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*/
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk)
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{
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int l1;
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/*
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* For virtual machine, we have to update system map if it's been
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* touched.
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*/
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if (next->context.generation < prev->context.generation) {
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for (l1 = MIN_KERNEL_SEG; l1 <= max_kernel_seg; l1++)
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next->pgd[l1] = init_mm.pgd[l1];
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next->context.generation = prev->context.generation;
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}
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__vmnewmap((void *)next->context.ptbase);
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}
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/*
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* Activate new memory map for task
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*/
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static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
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{
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unsigned long flags;
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local_irq_save(flags);
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switch_mm(prev, next, current_thread_info()->task);
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local_irq_restore(flags);
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}
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/* Generic hooks for arch_dup_mmap and arch_exit_mmap */
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#include <asm-generic/mm_hooks.h>
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#endif
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