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
18extern void mmu_context_init(void);
19extern 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 */
25extern pgd_t *pgd_current;
26
27static 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 */
37static 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 */
48static inline void destroy_context(struct mm_struct *mm)
49{
50}
51
52void switch_mm(struct mm_struct *prev, struct mm_struct *next,
53		struct task_struct *tsk);
54
55static 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 */
64void activate_mm(struct mm_struct *prev, struct mm_struct *next);
65
66#endif /* _ASM_NIOS2_MMU_CONTEXT_H */
67