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 20static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) 21{ 22} 23 24#ifdef CONFIG_MMU 25extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); 26extern void change_mm_context(mm_context_t *old, mm_context_t *ctx, pgd_t *_pgd); 27extern 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) \ 36do { \ 37 if (prev != next) \ 38 change_mm_context(&prev->context, &next->context, next->pgd); \ 39} while(0) 40 41#define activate_mm(prev, next) \ 42do { \ 43 change_mm_context(&prev->context, &next->context, next->pgd); \ 44} while(0) 45 46#define deactivate_mm(tsk, mm) \ 47do { \ 48} while(0) 49 50#endif 51