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1da177e4 LT |
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 | ||
1da177e4 LT |
15 | #include <asm/setup.h> |
16 | #include <asm/page.h> | |
17 | #include <asm/pgalloc.h> | |
18 | ||
19 | static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) | |
20 | { | |
21 | } | |
22 | ||
23 | #ifdef CONFIG_MMU | |
24 | extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); | |
25 | extern void change_mm_context(mm_context_t *old, mm_context_t *ctx, pgd_t *_pgd); | |
26 | extern void destroy_context(struct mm_struct *mm); | |
27 | ||
28 | #else | |
29 | #define init_new_context(tsk, mm) ({ 0; }) | |
30 | #define change_mm_context(old, ctx, _pml4) do {} while(0) | |
31 | #define destroy_context(mm) do {} while(0) | |
32 | #endif | |
33 | ||
34 | #define switch_mm(prev, next, tsk) \ | |
35 | do { \ | |
36 | if (prev != next) \ | |
37 | change_mm_context(&prev->context, &next->context, next->pgd); \ | |
38 | } while(0) | |
39 | ||
40 | #define activate_mm(prev, next) \ | |
41 | do { \ | |
42 | change_mm_context(&prev->context, &next->context, next->pgd); \ | |
43 | } while(0) | |
44 | ||
45 | #define deactivate_mm(tsk, mm) \ | |
46 | do { \ | |
47 | } while(0) | |
48 | ||
49 | #endif |