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1 | jermar | 1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
703 | jermar | 29 | #ifndef __AS_H__ |
30 | #define __AS_H__ |
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1 | jermar | 31 | |
121 | jermar | 32 | #include <arch/mm/page.h> |
703 | jermar | 33 | #include <arch/mm/as.h> |
391 | jermar | 34 | #include <arch/mm/asid.h> |
1 | jermar | 35 | #include <arch/types.h> |
36 | #include <typedefs.h> |
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37 | #include <synch/spinlock.h> |
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788 | jermar | 38 | #include <adt/list.h> |
1147 | jermar | 39 | #include <adt/btree.h> |
1 | jermar | 40 | |
1070 | jermar | 41 | /** Defined to be true if user address space and kernel address space shadow each other. */ |
42 | #define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH |
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43 | |||
1 | jermar | 44 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH |
45 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH |
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46 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH |
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47 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH |
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48 | |||
49 | #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END) |
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50 | |||
51 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
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52 | |||
778 | palkovsky | 53 | #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */ |
727 | jermar | 54 | |
1026 | jermar | 55 | /** Address space area flags. */ |
56 | #define AS_AREA_READ 1 |
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57 | #define AS_AREA_WRITE 2 |
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58 | #define AS_AREA_EXEC 4 |
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1178 | jermar | 59 | #define AS_AREA_DEVICE 8 |
1 | jermar | 60 | |
703 | jermar | 61 | /** Address space area structure. |
62 | * |
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63 | * Each as_area_t structure describes one contiguous area of virtual memory. |
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64 | * In the future, it should not be difficult to support shared areas. |
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1 | jermar | 65 | */ |
703 | jermar | 66 | struct as_area { |
623 | jermar | 67 | SPINLOCK_DECLARE(lock); |
1026 | jermar | 68 | int flags; |
1048 | jermar | 69 | count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */ |
703 | jermar | 70 | __address base; /**< Base address of this area. */ |
1 | jermar | 71 | }; |
72 | |||
703 | jermar | 73 | /** Address space structure. |
74 | * |
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75 | * as_t contains the list of as_areas of userspace accessible |
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1 | jermar | 76 | * pages for one or more tasks. Ranges of kernel memory pages are not |
77 | * supposed to figure in the list as they are shared by all tasks and |
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78 | * set up during system initialization. |
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79 | */ |
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703 | jermar | 80 | struct as { |
754 | jermar | 81 | /** Protected by asidlock. Must be acquired before as->lock. */ |
823 | jermar | 82 | link_t inactive_as_with_asid_link; |
727 | jermar | 83 | |
623 | jermar | 84 | SPINLOCK_DECLARE(lock); |
823 | jermar | 85 | |
86 | /** Number of processors on wich is this address space active. */ |
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87 | count_t refcount; |
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88 | |||
1149 | jermar | 89 | /** B+tree of address space areas. */ |
1147 | jermar | 90 | btree_t as_area_btree; |
756 | jermar | 91 | |
92 | /** Page table pointer. Constant on architectures that use global page hash table. */ |
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93 | pte_t *page_table; |
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94 | |||
95 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
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96 | asid_t asid; |
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1 | jermar | 97 | }; |
98 | |||
756 | jermar | 99 | struct as_operations { |
100 | pte_t *(* page_table_create)(int flags); |
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1044 | jermar | 101 | void (* page_table_lock)(as_t *as, bool lock); |
102 | void (* page_table_unlock)(as_t *as, bool unlock); |
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756 | jermar | 103 | }; |
104 | typedef struct as_operations as_operations_t; |
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105 | |||
755 | jermar | 106 | extern as_t *AS_KERNEL; |
756 | jermar | 107 | extern as_operations_t *as_operations; |
755 | jermar | 108 | |
823 | jermar | 109 | extern spinlock_t as_lock; |
110 | extern link_t inactive_as_with_asid_head; |
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111 | |||
756 | jermar | 112 | extern void as_init(void); |
113 | extern as_t *as_create(int flags); |
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1026 | jermar | 114 | extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base); |
1227 | jermar | 115 | extern __address as_area_resize(as_t *as, __address address, size_t size, int flags); |
754 | jermar | 116 | extern void as_set_mapping(as_t *as, __address page, __address frame); |
703 | jermar | 117 | extern int as_page_fault(__address page); |
823 | jermar | 118 | extern void as_switch(as_t *old, as_t *new); |
973 | palkovsky | 119 | extern void as_free(as_t *as); |
1 | jermar | 120 | |
727 | jermar | 121 | /* Interface to be implemented by architectures. */ |
703 | jermar | 122 | #ifndef as_install_arch |
123 | extern void as_install_arch(as_t *as); |
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124 | #endif /* !def as_install_arch */ |
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1 | jermar | 125 | |
126 | #endif |