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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 | /** Address space area flags. */ |
32 | /** Address space area flags. */ |
33 | #define AS_AREA_READ 1 |
33 | #define AS_AREA_READ 1 |
34 | #define AS_AREA_WRITE 2 |
34 | #define AS_AREA_WRITE 2 |
35 | #define AS_AREA_EXEC 4 |
35 | #define AS_AREA_EXEC 4 |
36 | #define AS_AREA_DEVICE 8 |
36 | #define AS_AREA_DEVICE 8 |
37 | #define AS_AREA_ANON 16 |
37 | #define AS_AREA_ANON 16 |
38 | 38 | ||
39 | #ifdef KERNEL |
39 | #ifdef KERNEL |
40 | 40 | ||
41 | #include <arch/mm/page.h> |
41 | #include <arch/mm/page.h> |
42 | #include <arch/mm/as.h> |
42 | #include <arch/mm/as.h> |
43 | #include <arch/mm/asid.h> |
43 | #include <arch/mm/asid.h> |
44 | #include <arch/types.h> |
44 | #include <arch/types.h> |
45 | #include <typedefs.h> |
45 | #include <typedefs.h> |
46 | #include <synch/spinlock.h> |
46 | #include <synch/spinlock.h> |
47 | #include <synch/mutex.h> |
47 | #include <synch/mutex.h> |
48 | #include <adt/list.h> |
48 | #include <adt/list.h> |
49 | #include <adt/btree.h> |
49 | #include <adt/btree.h> |
50 | 50 | ||
51 | /** Defined to be true if user address space and kernel address space shadow each other. */ |
51 | /** Defined to be true if user address space and kernel address space shadow each other. */ |
52 | #define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH |
52 | #define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH |
53 | 53 | ||
54 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH |
54 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH |
55 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH |
55 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH |
56 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH |
56 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH |
57 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH |
57 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH |
58 | 58 | ||
59 | #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END) |
59 | #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END) |
60 | 60 | ||
61 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
61 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
62 | 62 | ||
63 | #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */ |
63 | #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */ |
64 | 64 | ||
65 | /** Address space structure. |
65 | /** Address space structure. |
66 | * |
66 | * |
67 | * as_t contains the list of as_areas of userspace accessible |
67 | * as_t contains the list of as_areas of userspace accessible |
68 | * pages for one or more tasks. Ranges of kernel memory pages are not |
68 | * pages for one or more tasks. Ranges of kernel memory pages are not |
69 | * supposed to figure in the list as they are shared by all tasks and |
69 | * supposed to figure in the list as they are shared by all tasks and |
70 | * set up during system initialization. |
70 | * set up during system initialization. |
71 | */ |
71 | */ |
72 | struct as { |
72 | struct as { |
73 | /** Protected by asidlock. */ |
73 | /** Protected by asidlock. */ |
74 | link_t inactive_as_with_asid_link; |
74 | link_t inactive_as_with_asid_link; |
75 | 75 | ||
76 | mutex_t lock; |
76 | mutex_t lock; |
77 | 77 | ||
78 | /** Number of processors on wich is this address space active. */ |
78 | /** Number of processors on wich is this address space active. */ |
79 | count_t cpu_refcount; |
79 | count_t cpu_refcount; |
80 | 80 | ||
81 | /** B+tree of address space areas. */ |
81 | /** B+tree of address space areas. */ |
82 | btree_t as_area_btree; |
82 | btree_t as_area_btree; |
83 | 83 | ||
84 | /** Page table pointer. Constant on architectures that use global page hash table. */ |
84 | /** Page table pointer. Constant on architectures that use global page hash table. */ |
85 | pte_t *page_table; |
85 | pte_t *page_table; |
86 | 86 | ||
87 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
87 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
88 | asid_t asid; |
88 | asid_t asid; |
89 | }; |
89 | }; |
90 | 90 | ||
91 | struct as_operations { |
91 | struct as_operations { |
92 | pte_t *(* page_table_create)(int flags); |
92 | pte_t *(* page_table_create)(int flags); |
93 | void (* page_table_lock)(as_t *as, bool lock); |
93 | void (* page_table_lock)(as_t *as, bool lock); |
94 | void (* page_table_unlock)(as_t *as, bool unlock); |
94 | void (* page_table_unlock)(as_t *as, bool unlock); |
95 | }; |
95 | }; |
96 | typedef struct as_operations as_operations_t; |
96 | typedef struct as_operations as_operations_t; |
97 | 97 | ||
98 | /** Address space area attributes. */ |
98 | /** Address space area attributes. */ |
99 | #define AS_AREA_ATTR_NONE 0 |
99 | #define AS_AREA_ATTR_NONE 0 |
100 | #define AS_AREA_ATTR_PARTIAL 1 /**< Not fully initialized area. */ |
100 | #define AS_AREA_ATTR_PARTIAL 1 /**< Not fully initialized area. */ |
101 | 101 | ||
102 | #define AS_PF_FAULT 0 /**< The page fault was not resolved by as_page_fault(). */ |
102 | #define AS_PF_FAULT 0 /**< The page fault was not resolved by as_page_fault(). */ |
103 | #define AS_PF_OK 1 /**< The page fault was resolved by as_page_fault(). */ |
103 | #define AS_PF_OK 1 /**< The page fault was resolved by as_page_fault(). */ |
104 | #define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace() |
104 | #define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace() |
105 | or memcpy_to_uspace(). */ |
105 | or memcpy_to_uspace(). */ |
106 | 106 | ||
107 | typedef struct share_info share_info_t; |
107 | typedef struct share_info share_info_t; |
108 | typedef struct mem_backend mem_backend_t; |
108 | typedef struct mem_backend mem_backend_t; |
109 | 109 | ||
110 | /** Address space area structure. |
110 | /** Address space area structure. |
111 | * |
111 | * |
112 | * Each as_area_t structure describes one contiguous area of virtual memory. |
112 | * Each as_area_t structure describes one contiguous area of virtual memory. |
113 | * In the future, it should not be difficult to support shared areas. |
113 | * In the future, it should not be difficult to support shared areas. |
114 | */ |
114 | */ |
115 | struct as_area { |
115 | struct as_area { |
116 | mutex_t lock; |
116 | mutex_t lock; |
117 | int flags; /**< Flags related to the memory represented by the address space area. */ |
117 | int flags; /**< Flags related to the memory represented by the address space area. */ |
118 | int attributes; /**< Attributes related to the address space area itself. */ |
118 | int attributes; /**< Attributes related to the address space area itself. */ |
119 | count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */ |
119 | count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */ |
120 | __address base; /**< Base address of this area. */ |
120 | __address base; /**< Base address of this area. */ |
121 | btree_t used_space; /**< Map of used space. */ |
121 | btree_t used_space; /**< Map of used space. */ |
122 | share_info_t *sh_info; /**< If the address space area has been shared, this pointer will |
122 | share_info_t *sh_info; /**< If the address space area has been shared, this pointer will |
123 | reference the share info structure. */ |
123 | reference the share info structure. */ |
124 | mem_backend_t *backend; /**< Memory backend backing this address space area. */ |
124 | mem_backend_t *backend; /**< Memory backend backing this address space area. */ |
125 | void *backend_data[2]; /**< Data to be used by the backend. */ |
125 | void *backend_data[2]; /**< Data to be used by the backend. */ |
126 | }; |
126 | }; |
127 | 127 | ||
128 | /** Address space area backend structure. */ |
128 | /** Address space area backend structure. */ |
129 | struct mem_backend { |
129 | struct mem_backend { |
130 | int (* backend_page_fault)(as_area_t *area, __address addr, pf_access_t access); |
130 | int (* backend_page_fault)(as_area_t *area, __address addr, pf_access_t access); |
131 | void (* backend_frame_free)(as_area_t *area, __address page, __address frame); |
131 | void (* backend_frame_free)(as_area_t *area, __address page, __address frame); |
132 | }; |
132 | }; |
133 | 133 | ||
134 | extern as_t *AS_KERNEL; |
134 | extern as_t *AS_KERNEL; |
135 | extern as_operations_t *as_operations; |
135 | extern as_operations_t *as_operations; |
136 | 136 | ||
137 | extern spinlock_t inactive_as_with_asid_lock; |
137 | extern spinlock_t inactive_as_with_asid_lock; |
138 | extern link_t inactive_as_with_asid_head; |
138 | extern link_t inactive_as_with_asid_head; |
139 | 139 | ||
140 | extern void as_init(void); |
140 | extern void as_init(void); |
141 | extern as_t *as_create(int flags); |
141 | extern as_t *as_create(int flags); |
142 | extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs, |
142 | extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs, |
143 | mem_backend_t *backend, void **backend_data); |
143 | mem_backend_t *backend, void **backend_data); |
144 | extern int as_area_resize(as_t *as, __address address, size_t size, int flags); |
144 | extern int as_area_resize(as_t *as, __address address, size_t size, int flags); |
145 | extern int as_area_destroy(as_t *as, __address address); |
145 | extern int as_area_destroy(as_t *as, __address address); |
146 | extern int as_area_get_flags(as_area_t *area); |
146 | extern int as_area_get_flags(as_area_t *area); |
147 | extern void as_set_mapping(as_t *as, __address page, __address frame); |
147 | extern void as_set_mapping(as_t *as, __address page, __address frame); |
- | 148 | extern bool as_area_check_access(as_area_t *area, pf_access_t access); |
|
148 | extern int as_page_fault(__address page, pf_access_t access, istate_t *istate); |
149 | extern int as_page_fault(__address page, pf_access_t access, istate_t *istate); |
149 | extern void as_switch(as_t *old, as_t *new); |
150 | extern void as_switch(as_t *old, as_t *new); |
150 | extern void as_free(as_t *as); |
151 | extern void as_free(as_t *as); |
151 | extern int as_area_share(as_t *src_as, __address src_base, size_t acc_size, |
152 | extern int as_area_share(as_t *src_as, __address src_base, size_t acc_size, |
152 | __address dst_base, int dst_flags_mask); |
153 | __address dst_base, int dst_flags_mask); |
153 | extern size_t as_get_size(__address base); |
154 | extern size_t as_get_size(__address base); |
154 | extern int used_space_insert(as_area_t *a, __address page, count_t count); |
155 | extern int used_space_insert(as_area_t *a, __address page, count_t count); |
155 | extern int used_space_remove(as_area_t *a, __address page, count_t count); |
156 | extern int used_space_remove(as_area_t *a, __address page, count_t count); |
156 | 157 | ||
157 | /* Interface to be implemented by architectures. */ |
158 | /* Interface to be implemented by architectures. */ |
158 | #ifndef as_install_arch |
159 | #ifndef as_install_arch |
159 | extern void as_install_arch(as_t *as); |
160 | extern void as_install_arch(as_t *as); |
160 | #endif /* !def as_install_arch */ |
161 | #endif /* !def as_install_arch */ |
161 | 162 | ||
162 | /* Backend declarations. */ |
163 | /* Backend declarations. */ |
163 | extern mem_backend_t anon_backend; |
164 | extern mem_backend_t anon_backend; |
164 | extern mem_backend_t elf_backend; |
165 | extern mem_backend_t elf_backend; |
165 | 166 | ||
166 | /* Address space area related syscalls. */ |
167 | /* Address space area related syscalls. */ |
167 | extern __native sys_as_area_create(__address address, size_t size, int flags); |
168 | extern __native sys_as_area_create(__address address, size_t size, int flags); |
168 | extern __native sys_as_area_resize(__address address, size_t size, int flags); |
169 | extern __native sys_as_area_resize(__address address, size_t size, int flags); |
169 | extern __native sys_as_area_destroy(__address address); |
170 | extern __native sys_as_area_destroy(__address address); |
170 | 171 | ||
171 | #endif /* KERNEL */ |
172 | #endif /* KERNEL */ |
172 | 173 | ||
173 | #endif |
174 | #endif |
174 | 175 |