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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 | 37 | ||
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 <adt/list.h> |
48 | #include <adt/list.h> |
48 | #include <adt/btree.h> |
49 | #include <adt/btree.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 | 65 | ||
65 | /** Address space area attributes. */ |
66 | /** Address space area attributes. */ |
66 | #define AS_AREA_ATTR_NONE 0 |
67 | #define AS_AREA_ATTR_NONE 0 |
67 | #define AS_AREA_ATTR_PARTIAL 1 /* Not fully initialized area. */ |
68 | #define AS_AREA_ATTR_PARTIAL 1 /* Not fully initialized area. */ |
68 | 69 | ||
69 | #define AS_PF_FAULT 0 /**< The page fault was not resolved by asp_page_fault(). */ |
70 | #define AS_PF_FAULT 0 /**< The page fault was not resolved by as_page_fault(). */ |
70 | #define AS_PF_OK 1 /**< The page fault was resolved by as_page_fault(). */ |
71 | #define AS_PF_OK 1 /**< The page fault was resolved by as_page_fault(). */ |
71 | #define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace(). */ |
72 | #define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace() |
- | 73 | or memcpy_to_uspace(). */ |
|
72 | 74 | ||
73 | /** Address space area structure. |
75 | /** Address space area structure. |
74 | * |
76 | * |
75 | * Each as_area_t structure describes one contiguous area of virtual memory. |
77 | * Each as_area_t structure describes one contiguous area of virtual memory. |
76 | * In the future, it should not be difficult to support shared areas. |
78 | * In the future, it should not be difficult to support shared areas. |
77 | */ |
79 | */ |
78 | struct as_area { |
80 | struct as_area { |
79 | SPINLOCK_DECLARE(lock); |
81 | mutex_t lock; |
80 | int flags; /**< Flags related to the memory represented by the address space area. */ |
82 | int flags; /**< Flags related to the memory represented by the address space area. */ |
81 | int attributes; /**< Attributes related to the address space area itself. */ |
83 | int attributes; /**< Attributes related to the address space area itself. */ |
82 | count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */ |
84 | count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */ |
83 | __address base; /**< Base address of this area. */ |
85 | __address base; /**< Base address of this area. */ |
84 | }; |
86 | }; |
85 | 87 | ||
86 | /** Address space structure. |
88 | /** Address space structure. |
87 | * |
89 | * |
88 | * as_t contains the list of as_areas of userspace accessible |
90 | * as_t contains the list of as_areas of userspace accessible |
89 | * pages for one or more tasks. Ranges of kernel memory pages are not |
91 | * pages for one or more tasks. Ranges of kernel memory pages are not |
90 | * supposed to figure in the list as they are shared by all tasks and |
92 | * supposed to figure in the list as they are shared by all tasks and |
91 | * set up during system initialization. |
93 | * set up during system initialization. |
92 | */ |
94 | */ |
93 | struct as { |
95 | struct as { |
94 | /** Protected by asidlock. Must be acquired before as->lock. */ |
96 | /** Protected by asidlock. */ |
95 | link_t inactive_as_with_asid_link; |
97 | link_t inactive_as_with_asid_link; |
96 | 98 | ||
97 | SPINLOCK_DECLARE(lock); |
99 | mutex_t lock; |
98 | 100 | ||
99 | /** Number of processors on wich is this address space active. */ |
101 | /** Number of processors on wich is this address space active. */ |
100 | count_t refcount; |
102 | count_t refcount; |
101 | 103 | ||
102 | /** B+tree of address space areas. */ |
104 | /** B+tree of address space areas. */ |
103 | btree_t as_area_btree; |
105 | btree_t as_area_btree; |
104 | 106 | ||
105 | /** Page table pointer. Constant on architectures that use global page hash table. */ |
107 | /** Page table pointer. Constant on architectures that use global page hash table. */ |
106 | pte_t *page_table; |
108 | pte_t *page_table; |
107 | 109 | ||
108 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
110 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
109 | asid_t asid; |
111 | asid_t asid; |
110 | }; |
112 | }; |
111 | 113 | ||
112 | struct as_operations { |
114 | struct as_operations { |
113 | pte_t *(* page_table_create)(int flags); |
115 | pte_t *(* page_table_create)(int flags); |
114 | void (* page_table_lock)(as_t *as, bool lock); |
116 | void (* page_table_lock)(as_t *as, bool lock); |
115 | void (* page_table_unlock)(as_t *as, bool unlock); |
117 | void (* page_table_unlock)(as_t *as, bool unlock); |
116 | }; |
118 | }; |
117 | typedef struct as_operations as_operations_t; |
119 | typedef struct as_operations as_operations_t; |
118 | 120 | ||
119 | extern as_t *AS_KERNEL; |
121 | extern as_t *AS_KERNEL; |
120 | extern as_operations_t *as_operations; |
122 | extern as_operations_t *as_operations; |
121 | 123 | ||
122 | extern spinlock_t as_lock; |
124 | extern spinlock_t as_lock; |
123 | extern link_t inactive_as_with_asid_head; |
125 | extern link_t inactive_as_with_asid_head; |
124 | 126 | ||
125 | extern void as_init(void); |
127 | extern void as_init(void); |
126 | extern as_t *as_create(int flags); |
128 | extern as_t *as_create(int flags); |
127 | extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs); |
129 | extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs); |
128 | extern int as_area_resize(as_t *as, __address address, size_t size, int flags); |
130 | extern int as_area_resize(as_t *as, __address address, size_t size, int flags); |
129 | extern int as_area_destroy(as_t *as, __address address); |
131 | extern int as_area_destroy(as_t *as, __address address); |
130 | extern void as_set_mapping(as_t *as, __address page, __address frame); |
132 | extern void as_set_mapping(as_t *as, __address page, __address frame); |
131 | extern int as_page_fault(__address page, istate_t *istate); |
133 | extern int as_page_fault(__address page, istate_t *istate); |
132 | extern void as_switch(as_t *old, as_t *new); |
134 | extern void as_switch(as_t *old, as_t *new); |
133 | extern void as_free(as_t *as); |
135 | extern void as_free(as_t *as); |
134 | extern int as_area_steal(task_t *src_task, __address src_base, size_t acc_size, __address dst_base); |
136 | extern int as_area_steal(task_t *src_task, __address src_base, size_t acc_size, __address dst_base); |
135 | extern size_t as_get_size(__address base); |
137 | extern size_t as_get_size(__address base); |
136 | 138 | ||
137 | /* Interface to be implemented by architectures. */ |
139 | /* Interface to be implemented by architectures. */ |
138 | #ifndef as_install_arch |
140 | #ifndef as_install_arch |
139 | extern void as_install_arch(as_t *as); |
141 | extern void as_install_arch(as_t *as); |
140 | #endif /* !def as_install_arch */ |
142 | #endif /* !def as_install_arch */ |
141 | 143 | ||
142 | /* Address space area related syscalls. */ |
144 | /* Address space area related syscalls. */ |
143 | extern __native sys_as_area_create(__address address, size_t size, int flags); |
145 | extern __native sys_as_area_create(__address address, size_t size, int flags); |
144 | extern __native sys_as_area_resize(__address address, size_t size, int flags); |
146 | extern __native sys_as_area_resize(__address address, size_t size, int flags); |
145 | extern __native sys_as_area_destroy(__address address); |
147 | extern __native sys_as_area_destroy(__address address); |
146 | 148 | ||
147 | #endif /* KERNEL */ |
149 | #endif /* KERNEL */ |
148 | 150 | ||
149 | #endif |
151 | #endif |
150 | 152 |