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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> |
35 | jermar | 33 | #include <mm/heap.h> |
1 | jermar | 34 | #include <arch/mm/page.h> |
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 <config.h> |
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39 | #include <list.h> |
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40 | #include <panic.h> |
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41 | |||
42 | vm_t *vm_create(void) |
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43 | { |
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44 | vm_t *m; |
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45 | |||
46 | m = (vm_t *) malloc(sizeof(vm_t)); |
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47 | if (m) { |
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48 | spinlock_initialize(&m->lock); |
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49 | list_initialize(&m->vm_area_head); |
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50 | } |
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51 | |||
52 | return m; |
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53 | } |
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54 | |||
55 | void vm_destroy(vm_t *m) |
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56 | { |
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57 | } |
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58 | |||
59 | vm_area_t *vm_area_create(vm_t *m, vm_type_t type, int size, __address addr) |
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60 | { |
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61 | pri_t pri; |
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62 | vm_area_t *a; |
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63 | |||
64 | if (addr % PAGE_SIZE) |
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65 | panic(PANIC "addr not aligned to a page boundary"); |
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66 | |||
67 | pri = cpu_priority_high(); |
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68 | spinlock_lock(&m->lock); |
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69 | |||
70 | /* |
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71 | * TODO: test vm_area which is to be created doesn't overlap with an existing one. |
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72 | */ |
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73 | |||
74 | a = (vm_area_t *) malloc(sizeof(vm_area_t)); |
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75 | if (a) { |
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76 | int i; |
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77 | |||
78 | a->mapping = (__address *) malloc(size * sizeof(__address)); |
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79 | if (!a->mapping) { |
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80 | free(a); |
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81 | spinlock_unlock(&m->lock); |
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82 | cpu_priority_restore(pri); |
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83 | return NULL; |
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84 | } |
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85 | |||
86 | for (i=0; i<size; i++) |
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87 | a->mapping[i] = frame_alloc(0); |
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88 | |||
89 | spinlock_initialize(&a->lock); |
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90 | |||
91 | link_initialize(&a->link); |
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92 | a->type = type; |
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93 | a->size = size; |
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94 | a->address = addr; |
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95 | |||
96 | list_append(&a->link, &m->vm_area_head); |
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97 | |||
98 | } |
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99 | |||
100 | spinlock_unlock(&m->lock); |
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101 | cpu_priority_restore(pri); |
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102 | |||
103 | return a; |
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104 | } |
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105 | |||
106 | void vm_area_destroy(vm_area_t *a) |
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107 | { |
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108 | } |
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109 | |||
110 | void vm_area_map(vm_area_t *a) |
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111 | { |
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112 | int i, flags; |
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113 | pri_t pri; |
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114 | |||
115 | pri = cpu_priority_high(); |
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116 | spinlock_lock(&a->lock); |
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117 | |||
118 | switch (a->type) { |
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119 | case VMA_TEXT: |
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120 | flags = PAGE_EXEC | PAGE_READ | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE; |
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121 | break; |
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122 | case VMA_DATA: |
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123 | case VMA_STACK: |
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124 | flags = PAGE_READ | PAGE_WRITE | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE; |
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125 | break; |
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126 | default: |
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127 | panic(PANIC "unexpected vm_type_t %d", a->type); |
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128 | } |
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129 | |||
130 | for (i=0; i<a->size; i++) |
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131 | map_page_to_frame(a->address + i*PAGE_SIZE, a->mapping[i], flags, 0); |
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132 | |||
133 | spinlock_unlock(&a->lock); |
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134 | cpu_priority_restore(pri); |
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135 | } |
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136 | |||
137 | void vm_area_unmap(vm_area_t *a) |
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138 | { |
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139 | int i; |
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140 | pri_t pri; |
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141 | |||
142 | pri = cpu_priority_high(); |
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143 | spinlock_lock(&a->lock); |
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144 | |||
145 | for (i=0; i<a->size; i++) |
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146 | map_page_to_frame(a->address + i*PAGE_SIZE, 0, PAGE_NOT_PRESENT, 0); |
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5 | jermar | 147 | |
1 | jermar | 148 | spinlock_unlock(&a->lock); |
149 | cpu_priority_restore(pri); |
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150 | } |
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151 | |||
152 | void vm_install(vm_t *m) |
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153 | { |
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154 | link_t *l; |
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155 | pri_t pri; |
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156 | |||
157 | pri = cpu_priority_high(); |
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158 | spinlock_lock(&m->lock); |
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159 | |||
160 | for(l = m->vm_area_head.next; l != &m->vm_area_head; l = l->next) |
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161 | vm_area_map(list_get_instance(l, vm_area_t, link)); |
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162 | |||
163 | spinlock_unlock(&m->lock); |
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164 | cpu_priority_restore(pri); |
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165 | } |
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166 | |||
167 | void vm_uninstall(vm_t *m) |
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168 | { |
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169 | link_t *l; |
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170 | pri_t pri; |
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171 | |||
172 | pri = cpu_priority_high(); |
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5 | jermar | 173 | |
6 | jermar | 174 | tlb_shootdown_start(); |
5 | jermar | 175 | |
1 | jermar | 176 | spinlock_lock(&m->lock); |
177 | |||
178 | for(l = m->vm_area_head.next; l != &m->vm_area_head; l = l->next) |
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179 | vm_area_unmap(list_get_instance(l, vm_area_t, link)); |
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180 | |||
181 | spinlock_unlock(&m->lock); |
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5 | jermar | 182 | |
6 | jermar | 183 | tlb_shootdown_finalize(); |
5 | jermar | 184 | |
1 | jermar | 185 | cpu_priority_restore(pri); |
186 | } |