/* 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 <linux/config.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