| 1 | /*
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| 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 |
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| 29 | #ifndef __AS_H__
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| 30 | #define __AS_H__
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| 31 |
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| 32 | #include <arch/mm/page.h>
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| 33 | #include <arch/mm/as.h>
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| 34 | #include <arch/mm/asid.h>
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| 35 | #include <arch/types.h>
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| 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 |
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| 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 |
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| 45 | #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END)
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| 46 |
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| 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 |
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| 51 | #define FLAG_AS_KERNEL (1<<0) /**< Kernel address space. */
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| 52 |
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| 53 | enum as_area_type {
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| 54 | AS_AREA_TEXT = 1, AS_AREA_DATA, AS_AREA_STACK
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| 55 | };
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| 56 |
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| 57 | /** Address space area structure.
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| 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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| 61 | */
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| 62 | struct as_area {
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| 63 | SPINLOCK_DECLARE(lock);
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| 64 | link_t link;
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| 65 | as_area_type_t type;
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| 66 | size_t size; /**< Size of this area in multiples of PAGE_SIZE. */
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| 67 | __address base; /**< Base address of this area. */
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| 68 | };
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| 69 |
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| 70 | /** Address space structure.
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| 71 | *
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| 72 | * as_t contains the list of as_areas of userspace accessible
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| 73 | * pages for one or more tasks. Ranges of kernel memory pages are not
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| 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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| 77 | struct as {
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| 78 | /** Protected by asidlock. Must be acquired before as->lock. */
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| 79 | link_t as_with_asid_link;
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| 80 |
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| 81 | SPINLOCK_DECLARE(lock);
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| 82 | link_t as_area_head;
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| 83 |
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| 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 |
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| 87 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/
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| 88 | asid_t asid;
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| 89 | };
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| 90 |
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| 91 | struct as_operations {
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| 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 |
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| 96 | extern as_t *AS_KERNEL;
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| 97 | extern as_operations_t *as_operations;
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| 98 |
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| 99 | extern void as_init(void);
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| 100 | extern as_t *as_create(int flags);
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| 101 | extern as_area_t *as_area_create(as_t *as, as_area_type_t type, size_t size, __address base);
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| 102 | extern void as_set_mapping(as_t *as, __address page, __address frame);
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| 103 | extern int as_page_fault(__address page);
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| 104 | extern void as_install(as_t *m);
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| 105 |
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| 106 | /* Interface to be implemented by architectures. */
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| 107 | #ifndef as_install_arch
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| 108 | extern void as_install_arch(as_t *as);
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| 109 | #endif /* !def as_install_arch */
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| 110 |
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| 111 | #endif
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