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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> |
| 1 | jermar | 39 | |
| 40 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH |
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| 41 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH |
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| 42 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH |
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| 43 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH |
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| 44 | |||
| 45 | #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END) |
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| 46 | |||
| 47 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
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| 48 | |||
| 778 | palkovsky | 49 | #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */ |
| 727 | jermar | 50 | |
| 703 | jermar | 51 | enum as_area_type { |
| 52 | AS_AREA_TEXT = 1, AS_AREA_DATA, AS_AREA_STACK |
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| 1 | jermar | 53 | }; |
| 54 | |||
| 703 | jermar | 55 | /** Address space area structure. |
| 56 | * |
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| 57 | * Each as_area_t structure describes one contiguous area of virtual memory. |
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| 58 | * In the future, it should not be difficult to support shared areas. |
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| 1 | jermar | 59 | */ |
| 703 | jermar | 60 | struct as_area { |
| 623 | jermar | 61 | SPINLOCK_DECLARE(lock); |
| 1 | jermar | 62 | link_t link; |
| 703 | jermar | 63 | as_area_type_t type; |
| 727 | jermar | 64 | size_t size; /**< Size of this area in multiples of PAGE_SIZE. */ |
| 703 | jermar | 65 | __address base; /**< Base address of this area. */ |
| 1 | jermar | 66 | }; |
| 67 | |||
| 703 | jermar | 68 | /** Address space structure. |
| 69 | * |
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| 70 | * as_t contains the list of as_areas of userspace accessible |
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| 1 | jermar | 71 | * pages for one or more tasks. Ranges of kernel memory pages are not |
| 72 | * supposed to figure in the list as they are shared by all tasks and |
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| 73 | * set up during system initialization. |
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| 74 | */ |
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| 703 | jermar | 75 | struct as { |
| 754 | jermar | 76 | /** Protected by asidlock. Must be acquired before as->lock. */ |
| 823 | jermar | 77 | link_t inactive_as_with_asid_link; |
| 727 | jermar | 78 | |
| 623 | jermar | 79 | SPINLOCK_DECLARE(lock); |
| 823 | jermar | 80 | |
| 81 | /** Number of processors on wich is this address space active. */ |
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| 82 | count_t refcount; |
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| 83 | |||
| 703 | jermar | 84 | link_t as_area_head; |
| 756 | jermar | 85 | |
| 86 | /** Page table pointer. Constant on architectures that use global page hash table. */ |
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| 87 | pte_t *page_table; |
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| 88 | |||
| 89 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
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| 90 | asid_t asid; |
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| 1 | jermar | 91 | }; |
| 92 | |||
| 756 | jermar | 93 | struct as_operations { |
| 94 | pte_t *(* page_table_create)(int flags); |
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| 95 | }; |
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| 96 | typedef struct as_operations as_operations_t; |
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| 97 | |||
| 755 | jermar | 98 | extern as_t *AS_KERNEL; |
| 756 | jermar | 99 | extern as_operations_t *as_operations; |
| 755 | jermar | 100 | |
| 823 | jermar | 101 | extern spinlock_t as_lock; |
| 102 | extern link_t inactive_as_with_asid_head; |
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| 103 | |||
| 756 | jermar | 104 | extern void as_init(void); |
| 105 | extern as_t *as_create(int flags); |
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| 703 | jermar | 106 | extern as_area_t *as_area_create(as_t *as, as_area_type_t type, size_t size, __address base); |
| 977 | jermar | 107 | extern __address as_remap(as_t *as, __address address, size_t size, int flags); |
| 754 | jermar | 108 | extern void as_set_mapping(as_t *as, __address page, __address frame); |
| 703 | jermar | 109 | extern int as_page_fault(__address page); |
| 823 | jermar | 110 | extern void as_switch(as_t *old, as_t *new); |
| 973 | palkovsky | 111 | extern void as_free(as_t *as); |
| 1 | jermar | 112 | |
| 727 | jermar | 113 | /* Interface to be implemented by architectures. */ |
| 703 | jermar | 114 | #ifndef as_install_arch |
| 115 | extern void as_install_arch(as_t *as); |
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| 116 | #endif /* !def as_install_arch */ |
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| 1 | jermar | 117 | |
| 118 | #endif |