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
enter_lazy_tlb(struct mm_struct * mm,struct task_struct * tsk)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 */
init_new_context(struct task_struct * tsk,struct mm_struct * mm)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 */
destroy_context(struct mm_struct * mm)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
deactivate_mm(struct task_struct * tsk,struct mm_struct * mm)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