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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 | #include <adt/btree.h> |
39 | #include <adt/btree.h> |
40 | 40 | ||
41 | /** Defined to be true if user address space and kernel address space shadow each other. */ |
41 | /** Defined to be true if user address space and kernel address space shadow each other. */ |
42 | #define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH |
42 | #define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH |
43 | 43 | ||
44 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH |
44 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH |
45 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH |
45 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH |
46 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH |
46 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH |
47 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH |
47 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH |
48 | 48 | ||
49 | #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END) |
49 | #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END) |
50 | 50 | ||
51 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
51 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
52 | 52 | ||
53 | #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */ |
53 | #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */ |
54 | 54 | ||
55 | /** Address space area flags. */ |
55 | /** Address space area flags. */ |
56 | #define AS_AREA_READ 1 |
56 | #define AS_AREA_READ 1 |
57 | #define AS_AREA_WRITE 2 |
57 | #define AS_AREA_WRITE 2 |
58 | #define AS_AREA_EXEC 4 |
58 | #define AS_AREA_EXEC 4 |
59 | 59 | ||
60 | /** Address space area structure. |
60 | /** Address space area structure. |
61 | * |
61 | * |
62 | * Each as_area_t structure describes one contiguous area of virtual memory. |
62 | * Each as_area_t structure describes one contiguous area of virtual memory. |
63 | * In the future, it should not be difficult to support shared areas. |
63 | * In the future, it should not be difficult to support shared areas. |
64 | */ |
64 | */ |
65 | struct as_area { |
65 | struct as_area { |
66 | SPINLOCK_DECLARE(lock); |
66 | SPINLOCK_DECLARE(lock); |
67 | int flags; |
67 | int flags; |
68 | count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */ |
68 | count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */ |
69 | __address base; /**< Base address of this area. */ |
69 | __address base; /**< Base address of this area. */ |
70 | }; |
70 | }; |
71 | 71 | ||
72 | /** Address space structure. |
72 | /** Address space structure. |
73 | * |
73 | * |
74 | * as_t contains the list of as_areas of userspace accessible |
74 | * as_t contains the list of as_areas of userspace accessible |
75 | * pages for one or more tasks. Ranges of kernel memory pages are not |
75 | * pages for one or more tasks. Ranges of kernel memory pages are not |
76 | * supposed to figure in the list as they are shared by all tasks and |
76 | * supposed to figure in the list as they are shared by all tasks and |
77 | * set up during system initialization. |
77 | * set up during system initialization. |
78 | */ |
78 | */ |
79 | struct as { |
79 | struct as { |
80 | /** Protected by asidlock. Must be acquired before as->lock. */ |
80 | /** Protected by asidlock. Must be acquired before as->lock. */ |
81 | link_t inactive_as_with_asid_link; |
81 | link_t inactive_as_with_asid_link; |
82 | 82 | ||
83 | SPINLOCK_DECLARE(lock); |
83 | SPINLOCK_DECLARE(lock); |
84 | 84 | ||
85 | /** Number of processors on wich is this address space active. */ |
85 | /** Number of processors on wich is this address space active. */ |
86 | count_t refcount; |
86 | count_t refcount; |
87 | 87 | ||
88 | /** B+-tree of address space areas. */ |
88 | /** B+tree of address space areas. */ |
89 | btree_t as_area_btree; |
89 | btree_t as_area_btree; |
90 | 90 | ||
91 | /** Page table pointer. Constant on architectures that use global page hash table. */ |
91 | /** Page table pointer. Constant on architectures that use global page hash table. */ |
92 | pte_t *page_table; |
92 | pte_t *page_table; |
93 | 93 | ||
94 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
94 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
95 | asid_t asid; |
95 | asid_t asid; |
96 | }; |
96 | }; |
97 | 97 | ||
98 | struct as_operations { |
98 | struct as_operations { |
99 | pte_t *(* page_table_create)(int flags); |
99 | pte_t *(* page_table_create)(int flags); |
100 | void (* page_table_lock)(as_t *as, bool lock); |
100 | void (* page_table_lock)(as_t *as, bool lock); |
101 | void (* page_table_unlock)(as_t *as, bool unlock); |
101 | void (* page_table_unlock)(as_t *as, bool unlock); |
102 | }; |
102 | }; |
103 | typedef struct as_operations as_operations_t; |
103 | typedef struct as_operations as_operations_t; |
104 | 104 | ||
105 | extern as_t *AS_KERNEL; |
105 | extern as_t *AS_KERNEL; |
106 | extern as_operations_t *as_operations; |
106 | extern as_operations_t *as_operations; |
107 | 107 | ||
108 | extern spinlock_t as_lock; |
108 | extern spinlock_t as_lock; |
109 | extern link_t inactive_as_with_asid_head; |
109 | extern link_t inactive_as_with_asid_head; |
110 | 110 | ||
111 | extern void as_init(void); |
111 | extern void as_init(void); |
112 | extern as_t *as_create(int flags); |
112 | extern as_t *as_create(int flags); |
113 | extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base); |
113 | extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base); |
114 | extern __address as_remap(as_t *as, __address address, size_t size, int flags); |
114 | extern __address as_remap(as_t *as, __address address, size_t size, int flags); |
115 | extern void as_set_mapping(as_t *as, __address page, __address frame); |
115 | extern void as_set_mapping(as_t *as, __address page, __address frame); |
116 | extern int as_page_fault(__address page); |
116 | extern int as_page_fault(__address page); |
117 | extern void as_switch(as_t *old, as_t *new); |
117 | extern void as_switch(as_t *old, as_t *new); |
118 | extern void as_free(as_t *as); |
118 | extern void as_free(as_t *as); |
119 | 119 | ||
120 | /* Interface to be implemented by architectures. */ |
120 | /* Interface to be implemented by architectures. */ |
121 | #ifndef as_install_arch |
121 | #ifndef as_install_arch |
122 | extern void as_install_arch(as_t *as); |
122 | extern void as_install_arch(as_t *as); |
123 | #endif /* !def as_install_arch */ |
123 | #endif /* !def as_install_arch */ |
124 | 124 | ||
125 | #endif |
125 | #endif |
126 | 126 |