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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_CACHEABLE 8 |
36 | #define AS_AREA_CACHEABLE 8 |
37 | 37 | ||
38 | #ifdef KERNEL |
38 | #ifdef KERNEL |
39 | 39 | ||
40 | #include <arch/mm/page.h> |
40 | #include <arch/mm/page.h> |
41 | #include <arch/mm/as.h> |
41 | #include <arch/mm/as.h> |
42 | #include <arch/mm/asid.h> |
42 | #include <arch/mm/asid.h> |
43 | #include <arch/types.h> |
43 | #include <arch/types.h> |
44 | #include <typedefs.h> |
44 | #include <typedefs.h> |
45 | #include <synch/spinlock.h> |
45 | #include <synch/spinlock.h> |
46 | #include <synch/mutex.h> |
46 | #include <synch/mutex.h> |
47 | #include <adt/list.h> |
47 | #include <adt/list.h> |
48 | #include <adt/btree.h> |
48 | #include <adt/btree.h> |
- | 49 | #include <elf.h> |
|
49 | 50 | ||
50 | /** 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. */ |
51 | #define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH |
52 | #define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH |
52 | 53 | ||
53 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH |
54 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH |
54 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH |
55 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH |
55 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH |
56 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH |
56 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH |
57 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH |
57 | 58 | ||
58 | #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) |
59 | 60 | ||
60 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
61 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
61 | 62 | ||
62 | #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */ |
63 | #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */ |
63 | 64 | ||
64 | /** Address space structure. |
65 | /** Address space structure. |
65 | * |
66 | * |
66 | * as_t contains the list of as_areas of userspace accessible |
67 | * as_t contains the list of as_areas of userspace accessible |
67 | * 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 |
68 | * 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 |
69 | * set up during system initialization. |
70 | * set up during system initialization. |
70 | */ |
71 | */ |
71 | struct as { |
72 | struct as { |
72 | /** Protected by asidlock. */ |
73 | /** Protected by asidlock. */ |
73 | link_t inactive_as_with_asid_link; |
74 | link_t inactive_as_with_asid_link; |
74 | 75 | ||
75 | mutex_t lock; |
76 | mutex_t lock; |
76 | 77 | ||
77 | /** Number of processors on wich is this address space active. */ |
78 | /** Number of processors on wich is this address space active. */ |
78 | count_t cpu_refcount; |
79 | count_t cpu_refcount; |
79 | 80 | ||
80 | /** B+tree of address space areas. */ |
81 | /** B+tree of address space areas. */ |
81 | btree_t as_area_btree; |
82 | btree_t as_area_btree; |
82 | 83 | ||
83 | /** 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. */ |
84 | pte_t *page_table; |
85 | pte_t *page_table; |
85 | 86 | ||
86 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
87 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
87 | asid_t asid; |
88 | asid_t asid; |
88 | }; |
89 | }; |
89 | 90 | ||
90 | struct as_operations { |
91 | struct as_operations { |
91 | pte_t *(* page_table_create)(int flags); |
92 | pte_t *(* page_table_create)(int flags); |
92 | void (* page_table_lock)(as_t *as, bool lock); |
93 | void (* page_table_lock)(as_t *as, bool lock); |
93 | void (* page_table_unlock)(as_t *as, bool unlock); |
94 | void (* page_table_unlock)(as_t *as, bool unlock); |
94 | }; |
95 | }; |
95 | typedef struct as_operations as_operations_t; |
96 | typedef struct as_operations as_operations_t; |
96 | 97 | ||
97 | /** Address space area attributes. */ |
98 | /** Address space area attributes. */ |
98 | #define AS_AREA_ATTR_NONE 0 |
99 | #define AS_AREA_ATTR_NONE 0 |
99 | #define AS_AREA_ATTR_PARTIAL 1 /**< Not fully initialized area. */ |
100 | #define AS_AREA_ATTR_PARTIAL 1 /**< Not fully initialized area. */ |
100 | 101 | ||
101 | #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(). */ |
102 | #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(). */ |
103 | #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() |
104 | or memcpy_to_uspace(). */ |
105 | or memcpy_to_uspace(). */ |
105 | 106 | ||
106 | /** This structure contains information associated with the shared address space area. */ |
107 | /** This structure contains information associated with the shared address space area. */ |
107 | typedef struct { |
108 | typedef struct { |
108 | mutex_t lock; /**< This lock must be acquired only when the as_area lock is held. */ |
109 | mutex_t lock; /**< This lock must be acquired only when the as_area lock is held. */ |
109 | count_t refcount; /**< This structure can be deallocated if refcount drops to 0. */ |
110 | count_t refcount; /**< This structure can be deallocated if refcount drops to 0. */ |
110 | btree_t pagemap; /**< B+tree containing complete map of anonymous pages of the shared area. */ |
111 | btree_t pagemap; /**< B+tree containing complete map of anonymous pages of the shared area. */ |
111 | } share_info_t; |
112 | } share_info_t; |
112 | 113 | ||
113 | /** Address space area backend structure. */ |
114 | /** Address space area backend structure. */ |
114 | typedef struct { |
115 | typedef struct { |
115 | int (* page_fault)(as_area_t *area, __address addr, pf_access_t access); |
116 | int (* page_fault)(as_area_t *area, __address addr, pf_access_t access); |
116 | void (* frame_free)(as_area_t *area, __address page, __address frame); |
117 | void (* frame_free)(as_area_t *area, __address page, __address frame); |
117 | void (* share)(as_area_t *area); |
118 | void (* share)(as_area_t *area); |
118 | } mem_backend_t; |
119 | } mem_backend_t; |
119 | 120 | ||
120 | /** Backend data stored in address space area. */ |
121 | /** Backend data stored in address space area. */ |
121 | typedef struct backend_data { |
122 | typedef union { |
- | 123 | struct { /**< elf_backend members */ |
|
- | 124 | elf_header_t *elf; |
|
- | 125 | elf_segment_header_t *segment; |
|
- | 126 | }; |
|
- | 127 | struct { /**< phys_backend members */ |
|
122 | __native d1; |
128 | __address base; |
123 | __native d2; |
129 | count_t frames; |
- | 130 | }; |
|
124 | } mem_backend_data_t; |
131 | } mem_backend_data_t; |
125 | 132 | ||
126 | /** Address space area structure. |
133 | /** Address space area structure. |
127 | * |
134 | * |
128 | * Each as_area_t structure describes one contiguous area of virtual memory. |
135 | * Each as_area_t structure describes one contiguous area of virtual memory. |
129 | * In the future, it should not be difficult to support shared areas. |
136 | * In the future, it should not be difficult to support shared areas. |
130 | */ |
137 | */ |
131 | struct as_area { |
138 | struct as_area { |
132 | mutex_t lock; |
139 | mutex_t lock; |
133 | as_t *as; /**< Containing address space. */ |
140 | as_t *as; /**< Containing address space. */ |
134 | int flags; /**< Flags related to the memory represented by the address space area. */ |
141 | int flags; /**< Flags related to the memory represented by the address space area. */ |
135 | int attributes; /**< Attributes related to the address space area itself. */ |
142 | int attributes; /**< Attributes related to the address space area itself. */ |
136 | count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */ |
143 | count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */ |
137 | __address base; /**< Base address of this area. */ |
144 | __address base; /**< Base address of this area. */ |
138 | btree_t used_space; /**< Map of used space. */ |
145 | btree_t used_space; /**< Map of used space. */ |
139 | share_info_t *sh_info; /**< If the address space area has been shared, this pointer will |
146 | share_info_t *sh_info; /**< If the address space area has been shared, this pointer will |
140 | reference the share info structure. */ |
147 | reference the share info structure. */ |
141 | mem_backend_t *backend; /**< Memory backend backing this address space area. */ |
148 | mem_backend_t *backend; /**< Memory backend backing this address space area. */ |
142 | 149 | ||
143 | /** Data to be used by the backend. */ |
150 | /** Data to be used by the backend. */ |
144 | mem_backend_data_t backend_data; |
151 | mem_backend_data_t backend_data; |
145 | }; |
152 | }; |
146 | 153 | ||
147 | extern as_t *AS_KERNEL; |
154 | extern as_t *AS_KERNEL; |
148 | extern as_operations_t *as_operations; |
155 | extern as_operations_t *as_operations; |
149 | 156 | ||
150 | extern spinlock_t inactive_as_with_asid_lock; |
157 | extern spinlock_t inactive_as_with_asid_lock; |
151 | extern link_t inactive_as_with_asid_head; |
158 | extern link_t inactive_as_with_asid_head; |
152 | 159 | ||
153 | extern void as_init(void); |
160 | extern void as_init(void); |
154 | extern as_t *as_create(int flags); |
161 | extern as_t *as_create(int flags); |
155 | extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs, |
162 | extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs, |
156 | mem_backend_t *backend, mem_backend_data_t *backend_data); |
163 | mem_backend_t *backend, mem_backend_data_t *backend_data); |
157 | extern int as_area_resize(as_t *as, __address address, size_t size, int flags); |
164 | extern int as_area_resize(as_t *as, __address address, size_t size, int flags); |
158 | extern int as_area_destroy(as_t *as, __address address); |
165 | extern int as_area_destroy(as_t *as, __address address); |
159 | extern int as_area_get_flags(as_area_t *area); |
166 | extern int as_area_get_flags(as_area_t *area); |
160 | extern bool as_area_check_access(as_area_t *area, pf_access_t access); |
167 | extern bool as_area_check_access(as_area_t *area, pf_access_t access); |
161 | extern int as_page_fault(__address page, pf_access_t access, istate_t *istate); |
168 | extern int as_page_fault(__address page, pf_access_t access, istate_t *istate); |
162 | extern void as_switch(as_t *old, as_t *new); |
169 | extern void as_switch(as_t *old, as_t *new); |
163 | extern void as_free(as_t *as); |
170 | extern void as_free(as_t *as); |
164 | extern int as_area_share(as_t *src_as, __address src_base, size_t acc_size, |
171 | extern int as_area_share(as_t *src_as, __address src_base, size_t acc_size, |
165 | __address dst_base, int dst_flags_mask); |
172 | __address dst_base, int dst_flags_mask); |
166 | extern size_t as_get_size(__address base); |
173 | extern size_t as_get_size(__address base); |
167 | extern int used_space_insert(as_area_t *a, __address page, count_t count); |
174 | extern int used_space_insert(as_area_t *a, __address page, count_t count); |
168 | extern int used_space_remove(as_area_t *a, __address page, count_t count); |
175 | extern int used_space_remove(as_area_t *a, __address page, count_t count); |
169 | 176 | ||
170 | /* Interface to be implemented by architectures. */ |
177 | /* Interface to be implemented by architectures. */ |
171 | #ifndef as_install_arch |
178 | #ifndef as_install_arch |
172 | extern void as_install_arch(as_t *as); |
179 | extern void as_install_arch(as_t *as); |
173 | #endif /* !def as_install_arch */ |
180 | #endif /* !def as_install_arch */ |
174 | 181 | ||
175 | /* Backend declarations. */ |
182 | /* Backend declarations. */ |
176 | extern mem_backend_t anon_backend; |
183 | extern mem_backend_t anon_backend; |
177 | extern mem_backend_t elf_backend; |
184 | extern mem_backend_t elf_backend; |
178 | extern mem_backend_t phys_backend; |
185 | extern mem_backend_t phys_backend; |
179 | 186 | ||
180 | /* Address space area related syscalls. */ |
187 | /* Address space area related syscalls. */ |
181 | extern __native sys_as_area_create(__address address, size_t size, int flags); |
188 | extern __native sys_as_area_create(__address address, size_t size, int flags); |
182 | extern __native sys_as_area_resize(__address address, size_t size, int flags); |
189 | extern __native sys_as_area_resize(__address address, size_t size, int flags); |
183 | extern __native sys_as_area_destroy(__address address); |
190 | extern __native sys_as_area_destroy(__address address); |
184 | 191 | ||
185 | #endif /* KERNEL */ |
192 | #endif /* KERNEL */ |
186 | 193 | ||
187 | #endif |
194 | #endif |
188 | 195 |