| 1 | /*
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| 2 | * Copyright (c) 2010 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 kernel_generic_mm
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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 | #include <typedefs.h>
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| 39 | #include <abi/mm/as.h>
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| 40 | #include <arch/mm/page.h>
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| 41 | #include <arch/mm/as.h>
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| 42 | #include <arch/mm/asid.h>
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| 43 | #include <arch/istate.h>
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| 44 | #include <synch/spinlock.h>
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| 45 | #include <synch/mutex.h>
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| 46 | #include <adt/list.h>
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| 47 | #include <adt/odict.h>
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| 48 | #include <lib/elf.h>
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| 49 | #include <arch.h>
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| 50 | #include <lib/refcount.h>
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| 51 |
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| 52 | #define AS CURRENT->as
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| 53 |
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| 54 | /**
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| 55 | * Defined to be true if user address space and kernel address space shadow each
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| 56 | * other.
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| 57 | *
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| 58 | */
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| 59 | #define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
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| 60 |
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| 61 | /**
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| 62 | * Defined to be true if user address space and kernel address space do not
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| 63 | * share the same page table.
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| 64 | */
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| 65 | #define KERNEL_SEPARATE_PTL0 KERNEL_SEPARATE_PTL0_ARCH
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| 66 |
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| 67 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH
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| 68 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH
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| 69 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH
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| 70 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH
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| 71 |
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| 72 | /** Kernel address space. */
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| 73 | #define FLAG_AS_KERNEL (1 << 0)
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| 74 |
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| 75 | /* Address space area attributes. */
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| 76 | #define AS_AREA_ATTR_NONE 0
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| 77 | #define AS_AREA_ATTR_PARTIAL 1 /**< Not fully initialized area. */
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| 78 |
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| 79 | /** The page fault was resolved by as_page_fault(). */
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| 80 | #define AS_PF_OK 0
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| 81 |
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| 82 | /** The page fault was caused by memcpy_from_uspace() or memcpy_to_uspace(). */
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| 83 | #define AS_PF_DEFER 1
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| 84 |
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| 85 | /** The page fault was not resolved by as_page_fault(). */
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| 86 | #define AS_PF_FAULT 2
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| 87 |
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| 88 | /** The page fault was not resolved by as_page_fault(). Non-verbose version. */
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| 89 | #define AS_PF_SILENT 3
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| 90 |
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| 91 | /** Address space structure.
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| 92 | *
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| 93 | * as_t contains the list of as_areas of userspace accessible
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| 94 | * pages for one or more tasks. Ranges of kernel memory pages are not
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| 95 | * supposed to figure in the list as they are shared by all tasks and
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| 96 | * set up during system initialization.
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| 97 | *
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| 98 | */
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| 99 | typedef struct as {
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| 100 | /** Protected by asidlock. */
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| 101 | link_t inactive_as_with_asid_link;
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| 102 |
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| 103 | /**
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| 104 | * Number of processors on which this
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| 105 | * address space is active. Protected by
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| 106 | * asidlock.
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| 107 | */
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| 108 | size_t cpu_refcount;
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| 109 |
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| 110 | /** Address space identifier.
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| 111 | *
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| 112 | * Constant on architectures that do not
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| 113 | * support ASIDs. Protected by asidlock.
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| 114 | *
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| 115 | */
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| 116 | asid_t asid;
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| 117 |
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| 118 | /** Number of references (i.e. tasks that reference this as). */
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| 119 | atomic_refcount_t refcount;
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| 120 |
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| 121 | mutex_t lock;
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| 122 |
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| 123 | /** Address space areas in this address space by base address.
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| 124 | *
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| 125 | * Members are of type as_area_t.
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| 126 | */
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| 127 | odict_t as_areas;
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| 128 |
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| 129 | /** Non-generic content. */
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| 130 | as_genarch_t genarch;
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| 131 |
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| 132 | /** Architecture specific content. */
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| 133 | as_arch_t arch;
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| 134 | } as_t;
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| 135 |
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| 136 | typedef struct {
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| 137 | pte_t *(*page_table_create)(unsigned int);
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| 138 | void (*page_table_destroy)(pte_t *);
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| 139 | void (*page_table_lock)(as_t *, bool);
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| 140 | void (*page_table_unlock)(as_t *, bool);
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| 141 | bool (*page_table_locked)(as_t *);
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| 142 | } as_operations_t;
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| 143 |
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| 144 | /** Single anonymous page mapping. */
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| 145 | typedef struct {
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| 146 | /** Containing pagemap structure */
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| 147 | struct as_pagemap *pagemap;
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| 148 | /** Link to @c shinfo->pagemap ordered dictionary */
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| 149 | odlink_t lpagemap;
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| 150 | /** Virtual address */
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| 151 | uintptr_t vaddr;
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| 152 | /** Physical frame address */
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| 153 | uintptr_t frame;
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| 154 | } as_page_mapping_t;
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| 155 |
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| 156 | /** Map of anonymous pages in a shared area. */
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| 157 | typedef struct as_pagemap {
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| 158 | /**
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| 159 | * Dictionary ordered by virtual address. Members are of type
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| 160 | * as_page_mapping_t
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| 161 | */
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| 162 | odict_t map;
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| 163 | } as_pagemap_t;
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| 164 |
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| 165 | /** Used space interval */
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| 166 | typedef struct {
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| 167 | /** Containing used_space structure */
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| 168 | struct used_space *used_space;
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| 169 | /** Link to @c used_space->ivals */
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| 170 | odlink_t lused_space;
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| 171 | /** First page address */
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| 172 | uintptr_t page;
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| 173 | /** Count of pages */
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| 174 | size_t count;
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| 175 | } used_space_ival_t;
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| 176 |
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| 177 | /** Map of used space in an address space area */
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| 178 | typedef struct used_space {
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| 179 | /**
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| 180 | * Dictionary of intervals by start address.
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| 181 | * Members are of type @c used_space_ival_t.
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| 182 | */
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| 183 | odict_t ivals;
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| 184 | /** Total number of used pages. */
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| 185 | size_t pages;
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| 186 | } used_space_t;
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| 187 |
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| 188 | /**
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| 189 | * This structure contains information associated with the shared address space
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| 190 | * area.
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| 191 | *
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| 192 | */
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| 193 | typedef struct {
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| 194 | /** This lock must be acquired only when the as_area lock is held. */
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| 195 | mutex_t lock;
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| 196 | /** This structure can be deallocated if refcount drops to 0. */
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| 197 | size_t refcount;
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| 198 | /** True if the area has been ever shared. */
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| 199 | bool shared;
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| 200 |
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| 201 | /** Complete map of anonymous pages of the shared area. */
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| 202 | as_pagemap_t pagemap;
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| 203 |
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| 204 | /** Address space area backend. */
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| 205 | struct mem_backend *backend;
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| 206 | /** Address space area shared data. */
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| 207 | void *backend_shared_data;
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| 208 | } share_info_t;
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| 209 |
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| 210 | /** Page fault access type. */
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| 211 | typedef enum {
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| 212 | PF_ACCESS_READ,
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| 213 | PF_ACCESS_WRITE,
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| 214 | PF_ACCESS_EXEC,
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| 215 | PF_ACCESS_UNKNOWN
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| 216 | } pf_access_t;
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| 217 |
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| 218 | struct mem_backend;
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| 219 |
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| 220 | /** Backend data stored in address space area. */
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| 221 | typedef union mem_backend_data {
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| 222 | /* anon_backend members */
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| 223 | struct {
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| 224 | };
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| 225 |
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| 226 | /** elf_backend members */
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| 227 | struct {
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| 228 | uintptr_t elf_base;
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| 229 | elf_header_t *elf;
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| 230 | elf_segment_header_t *segment;
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| 231 | };
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| 232 |
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| 233 | /** phys_backend members */
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| 234 | struct {
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| 235 | uintptr_t base;
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| 236 | size_t frames;
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| 237 | bool anonymous;
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| 238 | struct parea *parea;
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| 239 | };
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| 240 |
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| 241 | /** user_backend members */
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| 242 | struct {
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| 243 | as_area_pager_info_t pager_info;
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| 244 | };
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| 245 |
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| 246 | } mem_backend_data_t;
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| 247 |
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| 248 | /** Address space area structure.
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| 249 | *
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| 250 | * Each as_area_t structure describes one contiguous area of virtual memory.
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| 251 | *
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| 252 | */
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| 253 | typedef struct {
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| 254 | mutex_t lock;
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| 255 |
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| 256 | /** Containing address space. */
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| 257 | as_t *as;
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| 258 |
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| 259 | /** Link to @c as->as_areas */
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| 260 | odlink_t las_areas;
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| 261 |
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| 262 | /** Memory flags. */
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| 263 | unsigned int flags;
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| 264 |
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| 265 | /** Address space area attributes. */
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| 266 | unsigned int attributes;
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| 267 |
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| 268 | /** Number of pages in the area. */
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| 269 | size_t pages;
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| 270 |
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| 271 | /** Base address of this area. */
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| 272 | uintptr_t base;
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| 273 |
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| 274 | /** Map of used space. */
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| 275 | used_space_t used_space;
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| 276 |
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| 277 | /**
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| 278 | * If the address space area is shared. this is
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| 279 | * a reference to the share info structure.
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| 280 | */
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| 281 | share_info_t *sh_info;
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| 282 |
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| 283 | /** Memory backend backing this address space area. */
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| 284 | struct mem_backend *backend;
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| 285 |
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| 286 | /** Data to be used by the backend. */
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| 287 | mem_backend_data_t backend_data;
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| 288 | } as_area_t;
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| 289 |
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| 290 | /** Address space area backend structure. */
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| 291 | typedef struct mem_backend {
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| 292 | bool (*create)(as_area_t *);
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| 293 | bool (*resize)(as_area_t *, size_t);
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| 294 | void (*share)(as_area_t *);
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| 295 | void (*destroy)(as_area_t *);
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| 296 |
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| 297 | bool (*is_resizable)(as_area_t *);
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| 298 | bool (*is_shareable)(as_area_t *);
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| 299 |
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| 300 | int (*page_fault)(as_area_t *, uintptr_t, pf_access_t);
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| 301 | void (*frame_free)(as_area_t *, uintptr_t, uintptr_t);
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| 302 |
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| 303 | bool (*create_shared_data)(as_area_t *);
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| 304 | void (*destroy_shared_data)(void *);
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| 305 | } mem_backend_t;
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| 306 |
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| 307 | extern as_t *AS_KERNEL;
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| 308 |
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| 309 | extern as_operations_t *as_operations;
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| 310 | extern list_t inactive_as_with_asid_list;
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| 311 |
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| 312 | extern void as_init(void);
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| 313 |
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| 314 | extern as_t *as_create(unsigned int);
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| 315 | extern void as_hold(as_t *);
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| 316 | extern void as_release(as_t *);
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| 317 | extern void as_switch(as_t *, as_t *);
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| 318 | extern int as_page_fault(uintptr_t, pf_access_t, istate_t *);
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| 319 |
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| 320 | extern as_area_t *as_area_create(as_t *, unsigned int, size_t, unsigned int,
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| 321 | mem_backend_t *, mem_backend_data_t *, uintptr_t *, uintptr_t);
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| 322 | extern errno_t as_area_destroy(as_t *, uintptr_t);
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| 323 | extern errno_t as_area_resize(as_t *, uintptr_t, size_t, unsigned int);
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| 324 | extern errno_t as_area_share(as_t *, uintptr_t, size_t, as_t *, unsigned int,
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| 325 | uintptr_t *, uintptr_t);
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| 326 | extern errno_t as_area_change_flags(as_t *, unsigned int, uintptr_t);
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| 327 | extern as_area_t *as_area_first(as_t *);
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| 328 | extern as_area_t *as_area_next(as_area_t *);
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| 329 |
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| 330 | extern void as_pagemap_initialize(as_pagemap_t *);
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| 331 | extern void as_pagemap_finalize(as_pagemap_t *);
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| 332 | extern as_page_mapping_t *as_pagemap_first(as_pagemap_t *);
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| 333 | extern as_page_mapping_t *as_pagemap_next(as_page_mapping_t *);
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| 334 | extern errno_t as_pagemap_find(as_pagemap_t *, uintptr_t, uintptr_t *);
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| 335 | extern void as_pagemap_insert(as_pagemap_t *, uintptr_t, uintptr_t);
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| 336 | extern void as_pagemap_remove(as_page_mapping_t *);
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| 337 |
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| 338 | extern unsigned int as_area_get_flags(as_area_t *);
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| 339 | extern bool as_area_check_access(as_area_t *, pf_access_t);
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| 340 | extern size_t as_area_get_size(uintptr_t);
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| 341 | extern used_space_ival_t *used_space_first(used_space_t *);
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| 342 | extern used_space_ival_t *used_space_next(used_space_ival_t *);
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| 343 | extern used_space_ival_t *used_space_find_gteq(used_space_t *, uintptr_t);
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| 344 | extern bool used_space_insert(used_space_t *, uintptr_t, size_t);
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| 345 |
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| 346 | /* Interface to be implemented by architectures. */
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| 347 |
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| 348 | #ifndef as_constructor_arch
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| 349 | extern errno_t as_constructor_arch(as_t *, unsigned int);
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| 350 | #endif /* !def as_constructor_arch */
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| 351 |
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| 352 | #ifndef as_destructor_arch
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| 353 | extern int as_destructor_arch(as_t *);
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| 354 | #endif /* !def as_destructor_arch */
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| 355 |
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| 356 | #ifndef as_create_arch
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| 357 | extern errno_t as_create_arch(as_t *, unsigned int);
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| 358 | #endif /* !def as_create_arch */
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| 359 |
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| 360 | #ifndef as_install_arch
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| 361 | extern void as_install_arch(as_t *);
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| 362 | #endif /* !def as_install_arch */
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| 363 |
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| 364 | #ifndef as_deinstall_arch
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| 365 | extern void as_deinstall_arch(as_t *);
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| 366 | #endif /* !def as_deinstall_arch */
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| 367 |
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| 368 | /* Backend declarations and functions. */
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| 369 | extern mem_backend_t anon_backend;
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| 370 | extern mem_backend_t elf_backend;
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| 371 | extern mem_backend_t phys_backend;
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| 372 | extern mem_backend_t user_backend;
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| 373 |
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| 374 | /* Address space area related syscalls. */
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| 375 | extern sysarg_t sys_as_area_create(uintptr_t, size_t, unsigned int, uintptr_t,
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| 376 | uspace_ptr_as_area_pager_info_t);
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| 377 | extern sys_errno_t sys_as_area_resize(uintptr_t, size_t, unsigned int);
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| 378 | extern sys_errno_t sys_as_area_change_flags(uintptr_t, unsigned int);
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| 379 | extern sys_errno_t sys_as_area_get_info(uintptr_t, uspace_ptr_as_area_info_t);
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| 380 | extern sys_errno_t sys_as_area_destroy(uintptr_t);
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| 381 |
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| 382 | /* Introspection functions. */
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| 383 | extern as_area_info_t *as_get_area_info(as_t *, size_t *);
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| 384 | extern void as_print(as_t *);
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| 385 |
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| 386 | #endif
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| 387 |
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| 388 | /** @}
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| 389 | */
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