1 /* 2 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> 3 * Copyright (C) 1996, 1997, 1998, 1999 by Ralf Baechle 4 * Copyright (C) 1999 Silicon Graphics, Inc. 5 * 6 * based on MIPS asm/mmu_context.h 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file "COPYING" in the main directory of this archive 10 * for more details. 11 */ 12 13 #ifndef _ASM_NIOS2_MMU_CONTEXT_H 14 #define _ASM_NIOS2_MMU_CONTEXT_H 15 16 #include <linux/mm_types.h> 17 18 #include <asm-generic/mm_hooks.h> 19 20 extern void mmu_context_init(void); 21 extern unsigned long get_pid_from_context(mm_context_t *ctx); 22 23 /* 24 * For the fast tlb miss handlers, we keep a pointer to the current pgd. 25 * processor. 26 */ 27 extern pgd_t *pgd_current; 28 29 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) 30 { 31 } 32 33 /* 34 * Initialize the context related info for a new mm_struct instance. 35 * 36 * Set all new contexts to 0, that way the generation will never match 37 * the currently running generation when this context is switched in. 38 */ 39 static inline int init_new_context(struct task_struct *tsk, 40 struct mm_struct *mm) 41 { 42 mm->context = 0; 43 return 0; 44 } 45 46 /* 47 * Destroy context related info for an mm_struct that is about 48 * to be put to rest. 49 */ 50 static inline void destroy_context(struct mm_struct *mm) 51 { 52 } 53 54 void switch_mm(struct mm_struct *prev, struct mm_struct *next, 55 struct task_struct *tsk); 56 57 static inline void deactivate_mm(struct task_struct *tsk, 58 struct mm_struct *mm) 59 { 60 } 61 62 /* 63 * After we have set current->mm to a new value, this activates 64 * the context for the new mm so we see the new mappings. 65 */ 66 void activate_mm(struct mm_struct *prev, struct mm_struct *next); 67 68 #endif /* _ASM_NIOS2_MMU_CONTEXT_H */ 69