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