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 <asm-generic/mm_hooks.h> 17 18 extern void mmu_context_init(void); 19 extern unsigned long get_pid_from_context(mm_context_t *ctx); 20 21 /* 22 * For the fast tlb miss handlers, we keep a pointer to the current pgd. 23 * processor. 24 */ 25 extern pgd_t *pgd_current; 26 27 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) 28 { 29 } 30 31 /* 32 * Initialize the context related info for a new mm_struct instance. 33 * 34 * Set all new contexts to 0, that way the generation will never match 35 * the currently running generation when this context is switched in. 36 */ 37 static inline int init_new_context(struct task_struct *tsk, 38 struct mm_struct *mm) 39 { 40 mm->context = 0; 41 return 0; 42 } 43 44 /* 45 * Destroy context related info for an mm_struct that is about 46 * to be put to rest. 47 */ 48 static inline void destroy_context(struct mm_struct *mm) 49 { 50 } 51 52 void switch_mm(struct mm_struct *prev, struct mm_struct *next, 53 struct task_struct *tsk); 54 55 static inline void deactivate_mm(struct task_struct *tsk, 56 struct mm_struct *mm) 57 { 58 } 59 60 /* 61 * After we have set current->mm to a new value, this activates 62 * the context for the new mm so we see the new mappings. 63 */ 64 void activate_mm(struct mm_struct *prev, struct mm_struct *next); 65 66 #endif /* _ASM_NIOS2_MMU_CONTEXT_H */ 67