mirror of https://gitee.com/openkylin/linux.git
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
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/* mmu_context.h: MMU context management routines
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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}
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#ifdef CONFIG_MMU
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extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
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extern void change_mm_context(mm_context_t *old, mm_context_t *ctx, pgd_t *_pgd);
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extern void destroy_context(struct mm_struct *mm);
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#else
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#define init_new_context(tsk, mm) ({ 0; })
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#define change_mm_context(old, ctx, _pml4) do {} while(0)
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#define destroy_context(mm) do {} while(0)
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#endif
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#define switch_mm(prev, next, tsk) \
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do { \
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if (prev != next) \
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change_mm_context(&prev->context, &next->context, next->pgd); \
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} while(0)
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#define activate_mm(prev, next) \
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do { \
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change_mm_context(&prev->context, &next->context, next->pgd); \
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} while(0)
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#define deactivate_mm(tsk, mm) \
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do { \
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} while(0)
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#endif
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