1 /* mmu_context.h: MMU context management routines
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #ifndef _ASM_MMU_CONTEXT_H
13 #define _ASM_MMU_CONTEXT_H
14
15 #include <asm/setup.h>
16 #include <asm/page.h>
17 #include <asm/pgalloc.h>
18 #include <asm-generic/mm_hooks.h>
19
enter_lazy_tlb(struct mm_struct * mm,struct task_struct * tsk)20 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
21 {
22 }
23
24 #ifdef CONFIG_MMU
25 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
26 extern void change_mm_context(mm_context_t *old, mm_context_t *ctx, pgd_t *_pgd);
27 extern void destroy_context(struct mm_struct *mm);
28
29 #else
30 #define init_new_context(tsk, mm) ({ 0; })
31 #define change_mm_context(old, ctx, _pml4) do {} while(0)
32 #define destroy_context(mm) do {} while(0)
33 #endif
34
35 #define switch_mm(prev, next, tsk) \
36 do { \
37 if (prev != next) \
38 change_mm_context(&prev->context, &next->context, next->pgd); \
39 } while(0)
40
41 #define activate_mm(prev, next) \
42 do { \
43 change_mm_context(&prev->context, &next->context, next->pgd); \
44 } while(0)
45
46 #define deactivate_mm(tsk, mm) \
47 do { \
48 } while(0)
49
50 #endif
51