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