| 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 | /** @addtogroup genericmm
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #ifndef KERN_AS_H_
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| 36 | #define KERN_AS_H_
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| 37 |
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| 38 | /** Address space area flags. */
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| 39 | #define AS_AREA_READ 1
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| 40 | #define AS_AREA_WRITE 2
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| 41 | #define AS_AREA_EXEC 4
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| 42 | #define AS_AREA_CACHEABLE 8
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| 43 |
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| 44 | #ifdef KERNEL
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| 45 |
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| 46 | #include <arch/mm/page.h>
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| 47 | #include <arch/mm/as.h>
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| 48 | #include <arch/mm/asid.h>
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| 49 | #include <arch/types.h>
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| 50 | #include <typedefs.h>
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| 51 | #include <synch/spinlock.h>
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| 52 | #include <synch/mutex.h>
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| 53 | #include <adt/list.h>
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| 54 | #include <adt/btree.h>
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| 55 | #include <elf.h>
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| 56 |
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| 57 | /** Defined to be true if user address space and kernel address space shadow each other. */
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| 58 | #define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
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| 59 |
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| 60 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH
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| 61 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH
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| 62 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH
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| 63 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH
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| 64 |
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| 65 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH
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| 66 |
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| 67 | #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */
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| 68 |
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| 69 | /** Address space structure.
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| 70 | *
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| 71 | * as_t contains the list of as_areas of userspace accessible
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| 72 | * pages for one or more tasks. Ranges of kernel memory pages are not
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| 73 | * supposed to figure in the list as they are shared by all tasks and
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| 74 | * set up during system initialization.
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| 75 | */
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| 76 | struct as {
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| 77 | /** Protected by asidlock. */
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| 78 | link_t inactive_as_with_asid_link;
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| 79 |
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| 80 | mutex_t lock;
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| 81 |
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| 82 | /** Number of references (i.e tasks that reference this as). */
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| 83 | count_t refcount;
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| 84 |
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| 85 | /** Number of processors on wich is this address space active. */
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| 86 | count_t cpu_refcount;
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| 87 |
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| 88 | /** B+tree of address space areas. */
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| 89 | btree_t as_area_btree;
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| 90 |
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| 91 | /** Page table pointer. Constant on architectures that use global page hash table. */
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| 92 | pte_t *page_table;
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| 93 |
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| 94 | /** Address space identifier. Constant on architectures that do not support ASIDs.*/
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| 95 | asid_t asid;
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| 96 |
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| 97 | /** Architecture specific content. */
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| 98 | as_arch_t arch;
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| 99 | };
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| 100 |
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| 101 | struct as_operations {
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| 102 | pte_t *(* page_table_create)(int flags);
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| 103 | void (* page_table_destroy)(pte_t *page_table);
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| 104 | void (* page_table_lock)(as_t *as, bool lock);
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| 105 | void (* page_table_unlock)(as_t *as, bool unlock);
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| 106 | };
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| 107 | typedef struct as_operations as_operations_t;
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| 108 |
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| 109 | /** Address space area attributes. */
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| 110 | #define AS_AREA_ATTR_NONE 0
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| 111 | #define AS_AREA_ATTR_PARTIAL 1 /**< Not fully initialized area. */
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| 112 |
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| 113 | #define AS_PF_FAULT 0 /**< The page fault was not resolved by as_page_fault(). */
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| 114 | #define AS_PF_OK 1 /**< The page fault was resolved by as_page_fault(). */
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| 115 | #define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace()
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| 116 | or memcpy_to_uspace(). */
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| 117 |
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| 118 | /** This structure contains information associated with the shared address space area. */
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| 119 | typedef struct {
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| 120 | mutex_t lock; /**< This lock must be acquired only when the as_area lock is held. */
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| 121 | count_t refcount; /**< This structure can be deallocated if refcount drops to 0. */
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| 122 | btree_t pagemap; /**< B+tree containing complete map of anonymous pages of the shared area. */
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| 123 | } share_info_t;
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| 124 |
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| 125 | /** Address space area backend structure. */
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| 126 | typedef struct {
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| 127 | int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);
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| 128 | void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);
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| 129 | void (* share)(as_area_t *area);
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| 130 | } mem_backend_t;
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| 131 |
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| 132 | /** Backend data stored in address space area. */
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| 133 | typedef union {
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| 134 | struct { /**< elf_backend members */
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| 135 | elf_header_t *elf;
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| 136 | elf_segment_header_t *segment;
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| 137 | };
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| 138 | struct { /**< phys_backend members */
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| 139 | uintptr_t base;
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| 140 | count_t frames;
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| 141 | };
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| 142 | } mem_backend_data_t;
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| 143 |
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| 144 | /** Address space area structure.
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| 145 | *
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| 146 | * Each as_area_t structure describes one contiguous area of virtual memory.
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| 147 | * In the future, it should not be difficult to support shared areas.
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| 148 | */
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| 149 | struct as_area {
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| 150 | mutex_t lock;
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| 151 | as_t *as; /**< Containing address space. */
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| 152 | int flags; /**< Flags related to the memory represented by the address space area. */
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| 153 | int attributes; /**< Attributes related to the address space area itself. */
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| 154 | count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */
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| 155 | uintptr_t base; /**< Base address of this area. */
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| 156 | btree_t used_space; /**< Map of used space. */
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| 157 | share_info_t *sh_info; /**< If the address space area has been shared, this pointer will
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| 158 | reference the share info structure. */
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| 159 | mem_backend_t *backend; /**< Memory backend backing this address space area. */
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| 160 |
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| 161 | /** Data to be used by the backend. */
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| 162 | mem_backend_data_t backend_data;
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| 163 | };
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| 164 |
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| 165 | extern as_t *AS_KERNEL;
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| 166 | extern as_operations_t *as_operations;
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| 167 |
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| 168 | extern spinlock_t inactive_as_with_asid_lock;
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| 169 | extern link_t inactive_as_with_asid_head;
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| 170 |
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| 171 | extern void as_init(void);
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| 172 |
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| 173 | extern as_t *as_create(int flags);
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| 174 | extern void as_destroy(as_t *as);
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| 175 | extern void as_switch(as_t *old, as_t *new);
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| 176 | extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate);
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| 177 |
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| 178 | extern as_area_t *as_area_create(as_t *as, int flags, size_t size, uintptr_t base, int attrs,
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| 179 | mem_backend_t *backend, mem_backend_data_t *backend_data);
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| 180 | extern int as_area_destroy(as_t *as, uintptr_t address);
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| 181 | extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags);
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| 182 | int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size,
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| 183 | as_t *dst_as, uintptr_t dst_base, int dst_flags_mask);
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| 184 |
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| 185 | extern int as_area_get_flags(as_area_t *area);
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| 186 | extern bool as_area_check_access(as_area_t *area, pf_access_t access);
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| 187 | extern size_t as_get_size(uintptr_t base);
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| 188 | extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count);
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| 189 | extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count);
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| 190 |
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| 191 |
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| 192 | /* Interface to be implemented by architectures. */
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| 193 | #ifndef as_constructor_arch
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| 194 | extern int as_constructor_arch(as_t *as, int flags);
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| 195 | #endif /* !def as_constructor_arch */
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| 196 | #ifndef as_destructor_arch
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| 197 | extern int as_destructor_arch(as_t *as);
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| 198 | #endif /* !def as_destructor_arch */
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| 199 | #ifndef as_create_arch
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| 200 | extern int as_create_arch(as_t *as, int flags);
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| 201 | #endif /* !def as_create_arch */
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| 202 | #ifndef as_install_arch
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| 203 | extern void as_install_arch(as_t *as);
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| 204 | #endif /* !def as_install_arch */
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| 205 | #ifndef as_deinstall_arch
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| 206 | extern void as_deinstall_arch(as_t *as);
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| 207 | #endif /* !def as_deinstall_arch */
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| 208 |
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| 209 | /* Backend declarations. */
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| 210 | extern mem_backend_t anon_backend;
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| 211 | extern mem_backend_t elf_backend;
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| 212 | extern mem_backend_t phys_backend;
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| 213 |
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| 214 | /* Address space area related syscalls. */
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| 215 | extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags);
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| 216 | extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags);
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| 217 | extern unative_t sys_as_area_destroy(uintptr_t address);
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| 218 |
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| 219 | /* Introspection functions. */
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| 220 | extern void as_print(as_t *as);
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| 221 |
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| 222 | #endif /* KERNEL */
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| 223 |
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| 224 | #endif
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| 225 |
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| 226 | /** @}
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| 227 | */
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