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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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| 38 | #include <list.h> |
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| 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 UTEXT_ADDRESS UTEXT_ADDRESS_ARCH |
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| 48 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
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| 49 | #define UDATA_ADDRESS UDATA_ADDRESS_ARCH |
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| 50 | |||
| 755 | jermar | 51 | #define FLAG_AS_KERNEL (1<<0) /**< Kernel address space. */ |
| 727 | jermar | 52 | |
| 703 | jermar | 53 | enum as_area_type { |
| 54 | AS_AREA_TEXT = 1, AS_AREA_DATA, AS_AREA_STACK |
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| 1 | jermar | 55 | }; |
| 56 | |||
| 703 | jermar | 57 | /** Address space area structure. |
| 58 | * |
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| 59 | * Each as_area_t structure describes one contiguous area of virtual memory. |
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| 60 | * In the future, it should not be difficult to support shared areas. |
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| 1 | jermar | 61 | */ |
| 703 | jermar | 62 | struct as_area { |
| 623 | jermar | 63 | SPINLOCK_DECLARE(lock); |
| 1 | jermar | 64 | link_t link; |
| 703 | jermar | 65 | as_area_type_t type; |
| 727 | jermar | 66 | size_t size; /**< Size of this area in multiples of PAGE_SIZE. */ |
| 703 | jermar | 67 | __address base; /**< Base address of this area. */ |
| 1 | jermar | 68 | }; |
| 69 | |||
| 703 | jermar | 70 | /** Address space structure. |
| 71 | * |
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| 72 | * as_t contains the list of as_areas of userspace accessible |
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| 1 | jermar | 73 | * pages for one or more tasks. Ranges of kernel memory pages are not |
| 74 | * supposed to figure in the list as they are shared by all tasks and |
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| 75 | * set up during system initialization. |
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| 76 | */ |
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| 703 | jermar | 77 | struct as { |
| 754 | jermar | 78 | /** Protected by asidlock. Must be acquired before as->lock. */ |
| 727 | jermar | 79 | link_t as_with_asid_link; |
| 80 | |||
| 623 | jermar | 81 | SPINLOCK_DECLARE(lock); |
| 703 | jermar | 82 | link_t as_area_head; |
| 756 | jermar | 83 | |
| 84 | /** Page table pointer. Constant on architectures that use global page hash table. */ |
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| 85 | pte_t *page_table; |
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| 86 | |||
| 87 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
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| 88 | asid_t asid; |
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| 1 | jermar | 89 | }; |
| 90 | |||
| 756 | jermar | 91 | struct as_operations { |
| 92 | pte_t *(* page_table_create)(int flags); |
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| 93 | }; |
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| 94 | typedef struct as_operations as_operations_t; |
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| 95 | |||
| 755 | jermar | 96 | extern as_t *AS_KERNEL; |
| 756 | jermar | 97 | extern as_operations_t *as_operations; |
| 755 | jermar | 98 | |
| 756 | jermar | 99 | extern void as_init(void); |
| 100 | extern as_t *as_create(int flags); |
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| 703 | jermar | 101 | extern as_area_t *as_area_create(as_t *as, as_area_type_t type, size_t size, __address base); |
| 754 | jermar | 102 | extern void as_set_mapping(as_t *as, __address page, __address frame); |
| 703 | jermar | 103 | extern int as_page_fault(__address page); |
| 104 | extern void as_install(as_t *m); |
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| 1 | jermar | 105 | |
| 727 | jermar | 106 | /* Interface to be implemented by architectures. */ |
| 703 | jermar | 107 | #ifndef as_install_arch |
| 108 | extern void as_install_arch(as_t *as); |
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| 109 | #endif /* !def as_install_arch */ |
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| 1 | jermar | 110 | |
| 111 | #endif |