Commit | Line | Data |
---|---|---|
1394f032 BW |
1 | /* |
2 | * File: include/asm-blackfin/mmu_context.h | |
3 | * Based on: | |
4 | * Author: | |
5 | * | |
6 | * Created: | |
7 | * Description: | |
8 | * | |
9 | * Modified: | |
10 | * Copyright 2004-2006 Analog Devices Inc. | |
11 | * | |
12 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, see the file COPYING, or write | |
26 | * to the Free Software Foundation, Inc., | |
27 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
28 | */ | |
29 | ||
30 | #ifndef __BLACKFIN_MMU_CONTEXT_H__ | |
31 | #define __BLACKFIN_MMU_CONTEXT_H__ | |
32 | ||
33 | #include <asm/setup.h> | |
34 | #include <asm/page.h> | |
35 | #include <asm/pgalloc.h> | |
36 | ||
37 | extern void *current_l1_stack_save; | |
38 | extern int nr_l1stack_tasks; | |
39 | extern void *l1_stack_base; | |
40 | extern unsigned long l1_stack_len; | |
41 | ||
42 | extern int l1sram_free(const void*); | |
43 | extern void *l1sram_alloc_max(void*); | |
44 | ||
45 | static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) | |
46 | { | |
47 | } | |
48 | ||
49 | /* Called when creating a new context during fork() or execve(). */ | |
50 | static inline int | |
51 | init_new_context(struct task_struct *tsk, struct mm_struct *mm) | |
52 | { | |
53 | return 0; | |
54 | } | |
55 | ||
56 | static inline void free_l1stack(void) | |
57 | { | |
58 | nr_l1stack_tasks--; | |
59 | if (nr_l1stack_tasks == 0) | |
60 | l1sram_free(l1_stack_base); | |
61 | } | |
62 | static inline void destroy_context(struct mm_struct *mm) | |
63 | { | |
64 | struct sram_list_struct *tmp; | |
65 | ||
66 | if (current_l1_stack_save == mm->context.l1_stack_save) | |
67 | current_l1_stack_save = 0; | |
68 | if (mm->context.l1_stack_save) | |
69 | free_l1stack(); | |
70 | ||
71 | while ((tmp = mm->context.sram_list)) { | |
72 | mm->context.sram_list = tmp->next; | |
73 | sram_free(tmp->addr); | |
74 | kfree(tmp); | |
75 | } | |
76 | } | |
77 | ||
78 | static inline unsigned long | |
79 | alloc_l1stack(unsigned long length, unsigned long *stack_base) | |
80 | { | |
81 | if (nr_l1stack_tasks == 0) { | |
82 | l1_stack_base = l1sram_alloc_max(&l1_stack_len); | |
83 | if (!l1_stack_base) | |
84 | return 0; | |
85 | } | |
86 | ||
87 | if (l1_stack_len < length) { | |
88 | if (nr_l1stack_tasks == 0) | |
89 | l1sram_free(l1_stack_base); | |
90 | return 0; | |
91 | } | |
92 | *stack_base = (unsigned long)l1_stack_base; | |
93 | nr_l1stack_tasks++; | |
94 | return l1_stack_len; | |
95 | } | |
96 | ||
97 | static inline int | |
98 | activate_l1stack(struct mm_struct *mm, unsigned long sp_base) | |
99 | { | |
100 | if (current_l1_stack_save) | |
101 | memcpy(current_l1_stack_save, l1_stack_base, l1_stack_len); | |
102 | mm->context.l1_stack_save = current_l1_stack_save = (void*)sp_base; | |
103 | memcpy(l1_stack_base, current_l1_stack_save, l1_stack_len); | |
104 | return 1; | |
105 | } | |
106 | ||
107 | #define deactivate_mm(tsk,mm) do { } while (0) | |
108 | ||
109 | static inline void activate_mm(struct mm_struct *prev_mm, | |
110 | struct mm_struct *next_mm) | |
111 | { | |
112 | if (!next_mm->context.l1_stack_save) | |
113 | return; | |
114 | if (next_mm->context.l1_stack_save == current_l1_stack_save) | |
115 | return; | |
116 | if (current_l1_stack_save) { | |
117 | memcpy(current_l1_stack_save, l1_stack_base, l1_stack_len); | |
118 | } | |
119 | current_l1_stack_save = next_mm->context.l1_stack_save; | |
120 | memcpy(l1_stack_base, current_l1_stack_save, l1_stack_len); | |
121 | } | |
122 | ||
123 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
124 | struct task_struct *tsk) | |
125 | { | |
126 | activate_mm(prev, next); | |
127 | } | |
128 | ||
129 | #endif |