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