projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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> | |
| d6dd61c8 | 18 | #include <asm-generic/mm_hooks.h> |
| 1da177e4 LT |
19 | |
| 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 |