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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 | /** @addtogroup genericmm |
29 | /** @addtogroup genericmm |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | */ |
33 | */ |
34 | 34 | ||
35 | #ifndef KERN_AS_H_ |
35 | #ifndef KERN_AS_H_ |
36 | #define KERN_AS_H_ |
36 | #define KERN_AS_H_ |
37 | 37 | ||
38 | /** Address space area flags. */ |
38 | /** Address space area flags. */ |
39 | #define AS_AREA_READ 1 |
39 | #define AS_AREA_READ 1 |
40 | #define AS_AREA_WRITE 2 |
40 | #define AS_AREA_WRITE 2 |
41 | #define AS_AREA_EXEC 4 |
41 | #define AS_AREA_EXEC 4 |
42 | #define AS_AREA_CACHEABLE 8 |
42 | #define AS_AREA_CACHEABLE 8 |
43 | 43 | ||
44 | #ifdef KERNEL |
44 | #ifdef KERNEL |
45 | 45 | ||
46 | #include <arch/mm/page.h> |
46 | #include <arch/mm/page.h> |
47 | #include <arch/mm/as.h> |
47 | #include <arch/mm/as.h> |
48 | #include <arch/mm/asid.h> |
48 | #include <arch/mm/asid.h> |
49 | #include <arch/types.h> |
49 | #include <arch/types.h> |
50 | #include <typedefs.h> |
- | |
51 | #include <synch/spinlock.h> |
50 | #include <synch/spinlock.h> |
52 | #include <synch/mutex.h> |
51 | #include <synch/mutex.h> |
53 | #include <adt/list.h> |
52 | #include <adt/list.h> |
54 | #include <adt/btree.h> |
53 | #include <adt/btree.h> |
55 | #include <lib/elf.h> |
54 | #include <lib/elf.h> |
56 | 55 | ||
57 | /** Defined to be true if user address space and kernel address space shadow each other. */ |
56 | /** Defined to be true if user address space and kernel address space shadow each other. */ |
58 | #define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH |
57 | #define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH |
59 | 58 | ||
60 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH |
59 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH |
61 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH |
60 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH |
62 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH |
61 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH |
63 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH |
62 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH |
64 | 63 | ||
65 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
64 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
66 | 65 | ||
67 | #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */ |
66 | #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */ |
68 | 67 | ||
69 | /** Address space structure. |
- | |
70 | * |
- | |
71 | * as_t contains the list of as_areas of userspace accessible |
- | |
72 | * pages for one or more tasks. Ranges of kernel memory pages are not |
- | |
73 | * supposed to figure in the list as they are shared by all tasks and |
- | |
74 | * set up during system initialization. |
- | |
75 | */ |
- | |
76 | struct as { |
- | |
77 | /** Protected by asidlock. */ |
- | |
78 | link_t inactive_as_with_asid_link; |
- | |
79 | - | ||
80 | mutex_t lock; |
- | |
81 | - | ||
82 | /** Number of references (i.e tasks that reference this as). */ |
- | |
83 | count_t refcount; |
- | |
84 | - | ||
85 | /** Number of processors on wich is this address space active. */ |
- | |
86 | count_t cpu_refcount; |
- | |
87 | - | ||
88 | /** B+tree of address space areas. */ |
- | |
89 | btree_t as_area_btree; |
- | |
90 | - | ||
91 | /** Page table pointer. Constant on architectures that use global page hash table. */ |
- | |
92 | pte_t *page_table; |
- | |
93 | - | ||
94 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
- | |
95 | asid_t asid; |
- | |
96 | - | ||
97 | /** Architecture specific content. */ |
- | |
98 | as_arch_t arch; |
- | |
99 | }; |
- | |
100 | - | ||
101 | struct as_operations { |
- | |
102 | pte_t *(* page_table_create)(int flags); |
- | |
103 | void (* page_table_destroy)(pte_t *page_table); |
- | |
104 | void (* page_table_lock)(as_t *as, bool lock); |
- | |
105 | void (* page_table_unlock)(as_t *as, bool unlock); |
- | |
106 | }; |
- | |
107 | typedef struct as_operations as_operations_t; |
- | |
108 | - | ||
109 | /** Address space area attributes. */ |
68 | /** Address space area attributes. */ |
110 | #define AS_AREA_ATTR_NONE 0 |
69 | #define AS_AREA_ATTR_NONE 0 |
111 | #define AS_AREA_ATTR_PARTIAL 1 /**< Not fully initialized area. */ |
70 | #define AS_AREA_ATTR_PARTIAL 1 /**< Not fully initialized area. */ |
112 | 71 | ||
113 | #define AS_PF_FAULT 0 /**< The page fault was not resolved by as_page_fault(). */ |
72 | #define AS_PF_FAULT 0 /**< The page fault was not resolved by as_page_fault(). */ |
114 | #define AS_PF_OK 1 /**< The page fault was resolved by as_page_fault(). */ |
73 | #define AS_PF_OK 1 /**< The page fault was resolved by as_page_fault(). */ |
115 | #define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace() |
74 | #define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace() or memcpy_to_uspace(). */ |
- | 75 | ||
- | 76 | typedef struct { |
|
116 | or memcpy_to_uspace(). */ |
77 | pte_t *(* page_table_create)(int flags); |
- | 78 | void (* page_table_destroy)(pte_t *page_table); |
|
- | 79 | void (* page_table_lock)(as_t *as, bool lock); |
|
- | 80 | void (* page_table_unlock)(as_t *as, bool unlock); |
|
- | 81 | } as_operations_t; |
|
117 | 82 | ||
118 | /** This structure contains information associated with the shared address space area. */ |
83 | /** This structure contains information associated with the shared address space area. */ |
119 | typedef struct { |
84 | typedef struct { |
120 | mutex_t lock; /**< This lock must be acquired only when the as_area lock is held. */ |
85 | mutex_t lock; /**< This lock must be acquired only when the as_area lock is held. */ |
121 | count_t refcount; /**< This structure can be deallocated if refcount drops to 0. */ |
86 | count_t refcount; /**< This structure can be deallocated if refcount drops to 0. */ |
122 | btree_t pagemap; /**< B+tree containing complete map of anonymous pages of the shared area. */ |
87 | btree_t pagemap; /**< B+tree containing complete map of anonymous pages of the shared area. */ |
123 | } share_info_t; |
88 | } share_info_t; |
124 | 89 | ||
125 | /** Address space area backend structure. */ |
90 | /** Page fault access type. */ |
126 | typedef struct { |
91 | typedef enum { |
127 | int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access); |
92 | PF_ACCESS_READ, |
128 | void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame); |
93 | PF_ACCESS_WRITE, |
- | 94 | PF_ACCESS_EXEC |
|
129 | void (* share)(as_area_t *area); |
95 | } pf_access_t; |
- | 96 | ||
130 | } mem_backend_t; |
97 | struct mem_backend; |
131 | 98 | ||
132 | /** Backend data stored in address space area. */ |
99 | /** Backend data stored in address space area. */ |
133 | typedef union { |
100 | typedef union mem_backend_data { |
134 | struct { /**< elf_backend members */ |
101 | struct { /**< elf_backend members */ |
135 | elf_header_t *elf; |
102 | elf_header_t *elf; |
136 | elf_segment_header_t *segment; |
103 | elf_segment_header_t *segment; |
137 | }; |
104 | }; |
138 | struct { /**< phys_backend members */ |
105 | struct { /**< phys_backend members */ |
139 | uintptr_t base; |
106 | uintptr_t base; |
140 | count_t frames; |
107 | count_t frames; |
141 | }; |
108 | }; |
142 | } mem_backend_data_t; |
109 | } mem_backend_data_t; |
143 | 110 | ||
144 | /** Address space area structure. |
111 | /** Address space area structure. |
145 | * |
112 | * |
146 | * Each as_area_t structure describes one contiguous area of virtual memory. |
113 | * Each as_area_t structure describes one contiguous area of virtual memory. |
147 | * In the future, it should not be difficult to support shared areas. |
114 | * In the future, it should not be difficult to support shared areas. |
148 | */ |
115 | */ |
149 | struct as_area { |
116 | typedef struct { |
150 | mutex_t lock; |
117 | mutex_t lock; |
151 | as_t *as; /**< Containing address space. */ |
118 | as_t *as; /**< Containing address space. */ |
152 | int flags; /**< Flags related to the memory represented by the address space area. */ |
119 | int flags; /**< Flags related to the memory represented by the address space area. */ |
153 | int attributes; /**< Attributes related to the address space area itself. */ |
120 | int attributes; /**< Attributes related to the address space area itself. */ |
154 | count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */ |
121 | count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */ |
155 | uintptr_t base; /**< Base address of this area. */ |
122 | uintptr_t base; /**< Base address of this area. */ |
156 | btree_t used_space; /**< Map of used space. */ |
123 | btree_t used_space; /**< Map of used space. */ |
157 | share_info_t *sh_info; /**< If the address space area has been shared, this pointer will |
124 | share_info_t *sh_info; /**< If the address space area has been shared, this pointer will |
158 | reference the share info structure. */ |
125 | reference the share info structure. */ |
159 | mem_backend_t *backend; /**< Memory backend backing this address space area. */ |
126 | struct mem_backend *backend; /**< Memory backend backing this address space area. */ |
160 | 127 | ||
161 | /** Data to be used by the backend. */ |
128 | /** Data to be used by the backend. */ |
162 | mem_backend_data_t backend_data; |
129 | mem_backend_data_t backend_data; |
- | 130 | } as_area_t; |
|
163 | }; |
131 | |
- | 132 | /** Address space area backend structure. */ |
|
- | 133 | typedef struct mem_backend { |
|
- | 134 | int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access); |
|
- | 135 | void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame); |
|
- | 136 | void (* share)(as_area_t *area); |
|
- | 137 | } mem_backend_t; |
|
164 | 138 | ||
165 | extern as_t *AS_KERNEL; |
139 | extern as_t *AS_KERNEL; |
166 | extern as_operations_t *as_operations; |
140 | extern as_operations_t *as_operations; |
167 | 141 | ||
168 | extern spinlock_t inactive_as_with_asid_lock; |
142 | extern spinlock_t inactive_as_with_asid_lock; |
169 | extern link_t inactive_as_with_asid_head; |
143 | extern link_t inactive_as_with_asid_head; |
170 | 144 | ||
171 | extern void as_init(void); |
145 | extern void as_init(void); |
172 | 146 | ||
173 | extern as_t *as_create(int flags); |
147 | extern as_t *as_create(int flags); |
174 | extern void as_destroy(as_t *as); |
148 | extern void as_destroy(as_t *as); |
175 | extern void as_switch(as_t *old, as_t *new); |
149 | extern void as_switch(as_t *old, as_t *new); |
176 | extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate); |
150 | extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate); |
177 | 151 | ||
178 | extern as_area_t *as_area_create(as_t *as, int flags, size_t size, uintptr_t base, int attrs, |
152 | extern as_area_t *as_area_create(as_t *as, int flags, size_t size, uintptr_t base, int attrs, |
179 | mem_backend_t *backend, mem_backend_data_t *backend_data); |
153 | mem_backend_t *backend, mem_backend_data_t *backend_data); |
180 | extern int as_area_destroy(as_t *as, uintptr_t address); |
154 | extern int as_area_destroy(as_t *as, uintptr_t address); |
181 | extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags); |
155 | extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags); |
182 | int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size, |
156 | int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size, |
183 | as_t *dst_as, uintptr_t dst_base, int dst_flags_mask); |
157 | as_t *dst_as, uintptr_t dst_base, int dst_flags_mask); |
184 | 158 | ||
185 | extern int as_area_get_flags(as_area_t *area); |
159 | extern int as_area_get_flags(as_area_t *area); |
186 | extern bool as_area_check_access(as_area_t *area, pf_access_t access); |
160 | extern bool as_area_check_access(as_area_t *area, pf_access_t access); |
187 | extern size_t as_get_size(uintptr_t base); |
161 | extern size_t as_get_size(uintptr_t base); |
188 | extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count); |
162 | extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count); |
189 | extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count); |
163 | extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count); |
190 | 164 | ||
191 | 165 | ||
192 | /* Interface to be implemented by architectures. */ |
166 | /* Interface to be implemented by architectures. */ |
193 | #ifndef as_constructor_arch |
167 | #ifndef as_constructor_arch |
194 | extern int as_constructor_arch(as_t *as, int flags); |
168 | extern int as_constructor_arch(as_t *as, int flags); |
195 | #endif /* !def as_constructor_arch */ |
169 | #endif /* !def as_constructor_arch */ |
196 | #ifndef as_destructor_arch |
170 | #ifndef as_destructor_arch |
197 | extern int as_destructor_arch(as_t *as); |
171 | extern int as_destructor_arch(as_t *as); |
198 | #endif /* !def as_destructor_arch */ |
172 | #endif /* !def as_destructor_arch */ |
199 | #ifndef as_create_arch |
173 | #ifndef as_create_arch |
200 | extern int as_create_arch(as_t *as, int flags); |
174 | extern int as_create_arch(as_t *as, int flags); |
201 | #endif /* !def as_create_arch */ |
175 | #endif /* !def as_create_arch */ |
202 | #ifndef as_install_arch |
176 | #ifndef as_install_arch |
203 | extern void as_install_arch(as_t *as); |
177 | extern void as_install_arch(as_t *as); |
204 | #endif /* !def as_install_arch */ |
178 | #endif /* !def as_install_arch */ |
205 | #ifndef as_deinstall_arch |
179 | #ifndef as_deinstall_arch |
206 | extern void as_deinstall_arch(as_t *as); |
180 | extern void as_deinstall_arch(as_t *as); |
207 | #endif /* !def as_deinstall_arch */ |
181 | #endif /* !def as_deinstall_arch */ |
208 | 182 | ||
209 | /* Backend declarations. */ |
183 | /* Backend declarations and functions. */ |
210 | extern mem_backend_t anon_backend; |
184 | extern mem_backend_t anon_backend; |
211 | extern mem_backend_t elf_backend; |
185 | extern mem_backend_t elf_backend; |
212 | extern mem_backend_t phys_backend; |
186 | extern mem_backend_t phys_backend; |
213 | 187 | ||
- | 188 | extern int elf_load(elf_header_t *header, as_t *as); |
|
- | 189 | ||
214 | /* Address space area related syscalls. */ |
190 | /* Address space area related syscalls. */ |
215 | extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags); |
191 | extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags); |
216 | extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags); |
192 | extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags); |
217 | extern unative_t sys_as_area_destroy(uintptr_t address); |
193 | extern unative_t sys_as_area_destroy(uintptr_t address); |
218 | 194 | ||
219 | /* Introspection functions. */ |
195 | /* Introspection functions. */ |
220 | extern void as_print(as_t *as); |
196 | extern void as_print(as_t *as); |
221 | 197 | ||
222 | #endif /* KERNEL */ |
198 | #endif /* KERNEL */ |
223 | 199 | ||
224 | #endif |
200 | #endif |
225 | 201 | ||
226 | /** @} |
202 | /** @} |
227 | */ |
203 | */ |
228 | 204 |