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| Rev | Author | Line No. | Line |
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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 | |||
| 29 | #include <mm/vm.h> |
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| 30 | #include <mm/page.h> |
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| 31 | #include <mm/frame.h> |
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| 5 | jermar | 32 | #include <mm/tlb.h> |
| 1 | jermar | 33 | #include <arch/mm/page.h> |
| 34 | #include <arch/types.h> |
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| 35 | #include <typedefs.h> |
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| 36 | #include <synch/spinlock.h> |
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| 37 | #include <config.h> |
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| 38 | #include <list.h> |
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| 39 | #include <panic.h> |
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| 40 | |||
| 41 | vm_t *vm_create(void) |
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| 42 | { |
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| 43 | vm_t *m; |
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| 44 | |||
| 45 | m = (vm_t *) malloc(sizeof(vm_t)); |
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| 46 | if (m) { |
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| 47 | spinlock_initialize(&m->lock); |
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| 48 | list_initialize(&m->vm_area_head); |
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| 49 | } |
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| 50 | |||
| 51 | return m; |
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| 52 | } |
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| 53 | |||
| 54 | void vm_destroy(vm_t *m) |
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| 55 | { |
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| 56 | } |
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| 57 | |||
| 58 | vm_area_t *vm_area_create(vm_t *m, vm_type_t type, int size, __address addr) |
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| 59 | { |
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| 60 | pri_t pri; |
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| 61 | vm_area_t *a; |
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| 62 | |||
| 63 | if (addr % PAGE_SIZE) |
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| 64 | panic(PANIC "addr not aligned to a page boundary"); |
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| 65 | |||
| 66 | pri = cpu_priority_high(); |
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| 67 | spinlock_lock(&m->lock); |
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| 68 | |||
| 69 | /* |
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| 70 | * TODO: test vm_area which is to be created doesn't overlap with an existing one. |
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| 71 | */ |
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| 72 | |||
| 73 | a = (vm_area_t *) malloc(sizeof(vm_area_t)); |
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| 74 | if (a) { |
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| 75 | int i; |
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| 76 | |||
| 77 | a->mapping = (__address *) malloc(size * sizeof(__address)); |
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| 78 | if (!a->mapping) { |
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| 79 | free(a); |
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| 80 | spinlock_unlock(&m->lock); |
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| 81 | cpu_priority_restore(pri); |
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| 82 | return NULL; |
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| 83 | } |
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| 84 | |||
| 85 | for (i=0; i<size; i++) |
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| 86 | a->mapping[i] = frame_alloc(0); |
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| 87 | |||
| 88 | spinlock_initialize(&a->lock); |
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| 89 | |||
| 90 | link_initialize(&a->link); |
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| 91 | a->type = type; |
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| 92 | a->size = size; |
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| 93 | a->address = addr; |
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| 94 | |||
| 95 | list_append(&a->link, &m->vm_area_head); |
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| 96 | |||
| 97 | } |
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| 98 | |||
| 99 | spinlock_unlock(&m->lock); |
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| 100 | cpu_priority_restore(pri); |
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| 101 | |||
| 102 | return a; |
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| 103 | } |
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| 104 | |||
| 105 | void vm_area_destroy(vm_area_t *a) |
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| 106 | { |
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| 107 | } |
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| 108 | |||
| 109 | void vm_area_map(vm_area_t *a) |
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| 110 | { |
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| 111 | int i, flags; |
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| 112 | pri_t pri; |
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| 113 | |||
| 114 | pri = cpu_priority_high(); |
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| 115 | spinlock_lock(&a->lock); |
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| 116 | |||
| 117 | switch (a->type) { |
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| 118 | case VMA_TEXT: |
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| 119 | flags = PAGE_EXEC | PAGE_READ | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE; |
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| 120 | break; |
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| 121 | case VMA_DATA: |
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| 122 | case VMA_STACK: |
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| 123 | flags = PAGE_READ | PAGE_WRITE | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE; |
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| 124 | break; |
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| 125 | default: |
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| 126 | panic(PANIC "unexpected vm_type_t %d", a->type); |
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| 127 | } |
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| 128 | |||
| 129 | for (i=0; i<a->size; i++) |
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| 130 | map_page_to_frame(a->address + i*PAGE_SIZE, a->mapping[i], flags, 0); |
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| 131 | |||
| 132 | spinlock_unlock(&a->lock); |
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| 133 | cpu_priority_restore(pri); |
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| 134 | } |
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| 135 | |||
| 136 | void vm_area_unmap(vm_area_t *a) |
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| 137 | { |
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| 138 | int i; |
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| 139 | pri_t pri; |
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| 140 | |||
| 141 | pri = cpu_priority_high(); |
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| 142 | spinlock_lock(&a->lock); |
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| 143 | |||
| 144 | for (i=0; i<a->size; i++) |
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| 145 | map_page_to_frame(a->address + i*PAGE_SIZE, 0, PAGE_NOT_PRESENT, 0); |
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| 5 | jermar | 146 | |
| 1 | jermar | 147 | spinlock_unlock(&a->lock); |
| 148 | cpu_priority_restore(pri); |
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| 149 | } |
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| 150 | |||
| 151 | void vm_install(vm_t *m) |
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| 152 | { |
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| 153 | link_t *l; |
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| 154 | pri_t pri; |
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| 155 | |||
| 156 | pri = cpu_priority_high(); |
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| 157 | spinlock_lock(&m->lock); |
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| 158 | |||
| 159 | for(l = m->vm_area_head.next; l != &m->vm_area_head; l = l->next) |
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| 160 | vm_area_map(list_get_instance(l, vm_area_t, link)); |
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| 161 | |||
| 162 | spinlock_unlock(&m->lock); |
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| 163 | cpu_priority_restore(pri); |
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| 164 | } |
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| 165 | |||
| 166 | void vm_uninstall(vm_t *m) |
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| 167 | { |
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| 168 | link_t *l; |
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| 169 | pri_t pri; |
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| 170 | |||
| 171 | pri = cpu_priority_high(); |
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| 5 | jermar | 172 | |
| 6 | jermar | 173 | tlb_shootdown_start(); |
| 5 | jermar | 174 | |
| 1 | jermar | 175 | spinlock_lock(&m->lock); |
| 176 | |||
| 177 | for(l = m->vm_area_head.next; l != &m->vm_area_head; l = l->next) |
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| 178 | vm_area_unmap(list_get_instance(l, vm_area_t, link)); |
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| 179 | |||
| 180 | spinlock_unlock(&m->lock); |
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| 5 | jermar | 181 | |
| 182 | tlb_invalidate(0); |
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| 6 | jermar | 183 | tlb_shootdown_finalize(); |
| 5 | jermar | 184 | |
| 1 | jermar | 185 | cpu_priority_restore(pri); |
| 186 | } |