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1 | /* |
1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #ifndef __AS_H__ |
29 | #ifndef __AS_H__ |
30 | #define __AS_H__ |
30 | #define __AS_H__ |
31 | 31 | ||
32 | #include <arch/mm/page.h> |
32 | #include <arch/mm/page.h> |
33 | #include <arch/mm/as.h> |
33 | #include <arch/mm/as.h> |
34 | #include <arch/mm/asid.h> |
34 | #include <arch/mm/asid.h> |
35 | #include <arch/types.h> |
35 | #include <arch/types.h> |
36 | #include <typedefs.h> |
36 | #include <typedefs.h> |
37 | #include <synch/spinlock.h> |
37 | #include <synch/spinlock.h> |
38 | #include <adt/list.h> |
38 | #include <adt/list.h> |
39 | 39 | ||
40 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH |
40 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH |
41 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH |
41 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH |
42 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH |
42 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH |
43 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH |
43 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH |
44 | 44 | ||
45 | #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END) |
45 | #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END) |
46 | 46 | ||
47 | #define UTEXT_ADDRESS UTEXT_ADDRESS_ARCH |
47 | #define UTEXT_ADDRESS UTEXT_ADDRESS_ARCH |
48 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
48 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
49 | #define UDATA_ADDRESS UDATA_ADDRESS_ARCH |
49 | #define UDATA_ADDRESS UDATA_ADDRESS_ARCH |
50 | 50 | ||
51 | #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */ |
51 | #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */ |
52 | 52 | ||
53 | enum as_area_type { |
53 | enum as_area_type { |
54 | AS_AREA_TEXT = 1, AS_AREA_DATA, AS_AREA_STACK |
54 | AS_AREA_TEXT = 1, AS_AREA_DATA, AS_AREA_STACK |
55 | }; |
55 | }; |
56 | 56 | ||
57 | /** Address space area structure. |
57 | /** Address space area structure. |
58 | * |
58 | * |
59 | * Each as_area_t structure describes one contiguous area of virtual memory. |
59 | * Each as_area_t structure describes one contiguous area of virtual memory. |
60 | * In the future, it should not be difficult to support shared areas. |
60 | * In the future, it should not be difficult to support shared areas. |
61 | */ |
61 | */ |
62 | struct as_area { |
62 | struct as_area { |
63 | SPINLOCK_DECLARE(lock); |
63 | SPINLOCK_DECLARE(lock); |
64 | link_t link; |
64 | link_t link; |
65 | as_area_type_t type; |
65 | as_area_type_t type; |
66 | size_t size; /**< Size of this area in multiples of PAGE_SIZE. */ |
66 | size_t size; /**< Size of this area in multiples of PAGE_SIZE. */ |
67 | __address base; /**< Base address of this area. */ |
67 | __address base; /**< Base address of this area. */ |
68 | }; |
68 | }; |
69 | 69 | ||
70 | /** Address space structure. |
70 | /** Address space structure. |
71 | * |
71 | * |
72 | * as_t contains the list of as_areas of userspace accessible |
72 | * as_t contains the list of as_areas of userspace accessible |
73 | * pages for one or more tasks. Ranges of kernel memory pages are not |
73 | * pages for one or more tasks. Ranges of kernel memory pages are not |
74 | * supposed to figure in the list as they are shared by all tasks and |
74 | * supposed to figure in the list as they are shared by all tasks and |
75 | * set up during system initialization. |
75 | * set up during system initialization. |
76 | */ |
76 | */ |
77 | struct as { |
77 | struct as { |
78 | /** Protected by asidlock. Must be acquired before as->lock. */ |
78 | /** Protected by asidlock. Must be acquired before as->lock. */ |
79 | link_t as_with_asid_link; |
79 | link_t inactive_as_with_asid_link; |
80 | 80 | ||
81 | SPINLOCK_DECLARE(lock); |
81 | SPINLOCK_DECLARE(lock); |
- | 82 | ||
- | 83 | /** Number of processors on wich is this address space active. */ |
|
- | 84 | count_t refcount; |
|
- | 85 | ||
82 | link_t as_area_head; |
86 | link_t as_area_head; |
83 | 87 | ||
84 | /** Page table pointer. Constant on architectures that use global page hash table. */ |
88 | /** Page table pointer. Constant on architectures that use global page hash table. */ |
85 | pte_t *page_table; |
89 | pte_t *page_table; |
86 | 90 | ||
87 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
91 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
88 | asid_t asid; |
92 | asid_t asid; |
89 | }; |
93 | }; |
90 | 94 | ||
91 | struct as_operations { |
95 | struct as_operations { |
92 | pte_t *(* page_table_create)(int flags); |
96 | pte_t *(* page_table_create)(int flags); |
93 | }; |
97 | }; |
94 | typedef struct as_operations as_operations_t; |
98 | typedef struct as_operations as_operations_t; |
95 | 99 | ||
96 | extern as_t *AS_KERNEL; |
100 | extern as_t *AS_KERNEL; |
97 | extern as_operations_t *as_operations; |
101 | extern as_operations_t *as_operations; |
98 | 102 | ||
- | 103 | extern spinlock_t as_lock; |
|
- | 104 | extern link_t inactive_as_with_asid_head; |
|
- | 105 | ||
99 | extern void as_init(void); |
106 | extern void as_init(void); |
100 | extern as_t *as_create(int flags); |
107 | extern as_t *as_create(int flags); |
101 | extern as_area_t *as_area_create(as_t *as, as_area_type_t type, size_t size, __address base); |
108 | extern as_area_t *as_area_create(as_t *as, as_area_type_t type, size_t size, __address base); |
102 | extern void as_set_mapping(as_t *as, __address page, __address frame); |
109 | extern void as_set_mapping(as_t *as, __address page, __address frame); |
103 | extern int as_page_fault(__address page); |
110 | extern int as_page_fault(__address page); |
104 | extern void as_install(as_t *m); |
111 | extern void as_switch(as_t *old, as_t *new); |
105 | 112 | ||
106 | /* Interface to be implemented by architectures. */ |
113 | /* Interface to be implemented by architectures. */ |
107 | #ifndef as_install_arch |
114 | #ifndef as_install_arch |
108 | extern void as_install_arch(as_t *as); |
115 | extern void as_install_arch(as_t *as); |
109 | #endif /* !def as_install_arch */ |
116 | #endif /* !def as_install_arch */ |
110 | 117 | ||
111 | #endif |
118 | #endif |
112 | 119 |