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 */