1 /*
2 * MM context support for the Hexagon architecture
3 *
4 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21 #ifndef _ASM_MMU_CONTEXT_H
22 #define _ASM_MMU_CONTEXT_H
23
24 #include <asm/setup.h>
25 #include <asm/page.h>
26 #include <asm/pgalloc.h>
27 #include <asm/mem-layout.h>
28
destroy_context(struct mm_struct * mm)29 static inline void destroy_context(struct mm_struct *mm)
30 {
31 }
32
33 /*
34 * VM port hides all TLB management, so "lazy TLB" isn't very
35 * meaningful. Even for ports to architectures with visble TLBs,
36 * this is almost invariably a null function.
37 */
enter_lazy_tlb(struct mm_struct * mm,struct task_struct * tsk)38 static inline void enter_lazy_tlb(struct mm_struct *mm,
39 struct task_struct *tsk)
40 {
41 }
42
43 /*
44 * Architecture-specific actions, if any, for memory map deactivation.
45 */
deactivate_mm(struct task_struct * tsk,struct mm_struct * mm)46 static inline void deactivate_mm(struct task_struct *tsk,
47 struct mm_struct *mm)
48 {
49 }
50
51 /**
52 * init_new_context - initialize context related info for new mm_struct instance
53 * @tsk: pointer to a task struct
54 * @mm: pointer to a new mm struct
55 */
init_new_context(struct task_struct * tsk,struct mm_struct * mm)56 static inline int init_new_context(struct task_struct *tsk,
57 struct mm_struct *mm)
58 {
59 /* mm->context is set up by pgd_alloc */
60 return 0;
61 }
62
63 /*
64 * Switch active mm context
65 */
switch_mm(struct mm_struct * prev,struct mm_struct * next,struct task_struct * tsk)66 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
67 struct task_struct *tsk)
68 {
69 int l1;
70
71 /*
72 * For virtual machine, we have to update system map if it's been
73 * touched.
74 */
75 if (next->context.generation < prev->context.generation) {
76 for (l1 = MIN_KERNEL_SEG; l1 <= max_kernel_seg; l1++)
77 next->pgd[l1] = init_mm.pgd[l1];
78
79 next->context.generation = prev->context.generation;
80 }
81
82 __vmnewmap((void *)next->context.ptbase);
83 }
84
85 /*
86 * Activate new memory map for task
87 */
activate_mm(struct mm_struct * prev,struct mm_struct * next)88 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
89 {
90 unsigned long flags;
91
92 local_irq_save(flags);
93 switch_mm(prev, next, current_thread_info()->task);
94 local_irq_restore(flags);
95 }
96
97 /* Generic hooks for arch_dup_mmap and arch_exit_mmap */
98 #include <asm-generic/mm_hooks.h>
99
100 #endif
101