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703 | jermar | 1 | /* |
2 | * Copyright (C) 2001-2006 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 | /* |
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30 | * This file contains address space manipulation functions. |
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31 | * Roughly speaking, this is a higher-level client of |
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32 | * Virtual Address Translation (VAT) subsystem. |
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33 | */ |
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34 | |||
35 | #include <mm/as.h> |
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727 | jermar | 36 | #include <mm/asid.h> |
703 | jermar | 37 | #include <mm/page.h> |
38 | #include <mm/frame.h> |
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39 | #include <mm/tlb.h> |
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40 | #include <mm/heap.h> |
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41 | #include <arch/mm/page.h> |
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42 | #include <genarch/mm/page_pt.h> |
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727 | jermar | 43 | #include <mm/asid.h> |
703 | jermar | 44 | #include <arch/mm/asid.h> |
45 | #include <arch/mm/as.h> |
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46 | #include <arch/types.h> |
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47 | #include <typedefs.h> |
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48 | #include <synch/spinlock.h> |
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49 | #include <config.h> |
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50 | #include <list.h> |
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51 | #include <panic.h> |
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52 | #include <arch/asm.h> |
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53 | #include <debug.h> |
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54 | #include <memstr.h> |
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55 | #include <arch.h> |
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56 | #include <print.h> |
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57 | |||
58 | #define KAS_START_INDEX PTL0_INDEX(KERNEL_ADDRESS_SPACE_START) |
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59 | #define KAS_END_INDEX PTL0_INDEX(KERNEL_ADDRESS_SPACE_END) |
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60 | #define KAS_INDICES (1+(KAS_END_INDEX-KAS_START_INDEX)) |
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61 | |||
754 | jermar | 62 | static int get_area_flags(as_area_t *a); |
703 | jermar | 63 | |
64 | /** Create address space. */ |
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65 | /* |
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66 | * FIXME: this interface must be meaningful for all possible VAT |
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67 | * (Virtual Address Translation) mechanisms. |
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68 | */ |
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727 | jermar | 69 | as_t *as_create(pte_t *ptl0, int flags) |
703 | jermar | 70 | { |
71 | as_t *as; |
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72 | |||
73 | as = (as_t *) malloc(sizeof(as_t)); |
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74 | if (as) { |
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727 | jermar | 75 | list_initialize(&as->as_with_asid_link); |
703 | jermar | 76 | spinlock_initialize(&as->lock, "as_lock"); |
77 | list_initialize(&as->as_area_head); |
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78 | |||
755 | jermar | 79 | if (flags & FLAG_AS_KERNEL) |
727 | jermar | 80 | as->asid = ASID_KERNEL; |
81 | else |
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82 | as->asid = ASID_INVALID; |
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703 | jermar | 83 | |
84 | as->ptl0 = ptl0; |
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85 | if (!as->ptl0) { |
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86 | pte_t *src_ptl0, *dst_ptl0; |
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87 | |||
88 | src_ptl0 = (pte_t *) PA2KA((__address) GET_PTL0_ADDRESS()); |
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89 | dst_ptl0 = (pte_t *) frame_alloc(FRAME_KA | FRAME_PANIC, ONE_FRAME, NULL); |
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90 | |||
91 | // memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
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92 | // memcpy((void *) &dst_ptl0[KAS_START_INDEX], (void *) &src_ptl0[KAS_START_INDEX], KAS_INDICES); |
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93 | |||
94 | memcpy((void *) dst_ptl0,(void *) src_ptl0, PAGE_SIZE); |
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95 | |||
96 | as->ptl0 = (pte_t *) KA2PA((__address) dst_ptl0); |
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97 | } |
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98 | } |
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99 | |||
100 | return as; |
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101 | } |
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102 | |||
103 | /** Create address space area of common attributes. |
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104 | * |
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105 | * The created address space area is added to the target address space. |
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106 | * |
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107 | * @param as Target address space. |
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108 | * @param type Type of area. |
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109 | * @param size Size of area in multiples of PAGE_SIZE. |
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110 | * @param base Base address of area. |
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111 | * |
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112 | * @return Address space area on success or NULL on failure. |
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113 | */ |
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114 | as_area_t *as_area_create(as_t *as, as_area_type_t type, size_t size, __address base) |
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115 | { |
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116 | ipl_t ipl; |
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117 | as_area_t *a; |
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118 | |||
119 | if (base % PAGE_SIZE) |
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120 | panic("addr not aligned to a page boundary"); |
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121 | |||
122 | ipl = interrupts_disable(); |
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123 | spinlock_lock(&as->lock); |
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124 | |||
125 | /* |
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126 | * TODO: test as_area which is to be created doesn't overlap with an existing one. |
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127 | */ |
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128 | |||
129 | a = (as_area_t *) malloc(sizeof(as_area_t)); |
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754 | jermar | 130 | if (a) { |
703 | jermar | 131 | spinlock_initialize(&a->lock, "as_area_lock"); |
132 | |||
133 | link_initialize(&a->link); |
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134 | a->type = type; |
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135 | a->size = size; |
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136 | a->base = base; |
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137 | |||
138 | list_append(&a->link, &as->as_area_head); |
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139 | } |
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140 | |||
141 | spinlock_unlock(&as->lock); |
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142 | interrupts_restore(ipl); |
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704 | jermar | 143 | |
703 | jermar | 144 | return a; |
145 | } |
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146 | |||
754 | jermar | 147 | /** Initialize mapping for one page of address space. |
703 | jermar | 148 | * |
754 | jermar | 149 | * This functions maps 'page' to 'frame' according |
150 | * to attributes of the address space area to |
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151 | * wich 'page' belongs. |
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703 | jermar | 152 | * |
754 | jermar | 153 | * @param a Target address space. |
154 | * @param page Virtual page within the area. |
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155 | * @param frame Physical frame to which page will be mapped. |
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703 | jermar | 156 | */ |
754 | jermar | 157 | void as_set_mapping(as_t *as, __address page, __address frame) |
703 | jermar | 158 | { |
754 | jermar | 159 | as_area_t *a, *area = NULL; |
160 | link_t *cur; |
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703 | jermar | 161 | ipl_t ipl; |
162 | |||
163 | ipl = interrupts_disable(); |
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754 | jermar | 164 | spinlock_lock(&as->lock); |
703 | jermar | 165 | |
754 | jermar | 166 | /* |
167 | * First, try locate an area. |
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168 | */ |
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169 | for (cur = as->as_area_head.next; cur != &as->as_area_head; cur = cur->next) { |
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170 | a = list_get_instance(cur, as_area_t, link); |
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171 | spinlock_lock(&a->lock); |
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172 | |||
173 | if ((page >= a->base) && (page < a->base + a->size * PAGE_SIZE)) { |
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174 | area = a; |
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175 | break; |
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176 | } |
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177 | |||
178 | spinlock_unlock(&a->lock); |
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179 | } |
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718 | decky | 180 | |
754 | jermar | 181 | if (!area) { |
182 | panic("page not part of any as_area\n"); |
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183 | } |
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184 | |||
185 | /* |
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186 | * Note: area->lock is held. |
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187 | */ |
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188 | |||
755 | jermar | 189 | page_mapping_insert(as, page, frame, get_area_flags(area), (__address) as->ptl0); |
754 | jermar | 190 | |
191 | spinlock_unlock(&area->lock); |
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192 | spinlock_unlock(&as->lock); |
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703 | jermar | 193 | interrupts_restore(ipl); |
194 | } |
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195 | |||
196 | /** Handle page fault within the current address space. |
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197 | * |
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198 | * This is the high-level page fault handler. |
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199 | * Interrupts are assumed disabled. |
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200 | * |
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201 | * @param page Faulting page. |
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202 | * |
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704 | jermar | 203 | * @return 0 on page fault, 1 on success. |
703 | jermar | 204 | */ |
205 | int as_page_fault(__address page) |
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206 | { |
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207 | link_t *cur; |
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208 | as_area_t *a, *area = NULL; |
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209 | __address frame; |
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210 | |||
211 | ASSERT(AS); |
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212 | spinlock_lock(&AS->lock); |
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213 | |||
214 | /* |
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215 | * Search this areas of this address space for presence of 'page'. |
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216 | */ |
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217 | for (cur = AS->as_area_head.next; cur != &AS->as_area_head; cur = cur->next) { |
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218 | a = list_get_instance(cur, as_area_t, link); |
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219 | spinlock_lock(&a->lock); |
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220 | |||
221 | if ((page >= a->base) && (page < a->base + a->size * PAGE_SIZE)) { |
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222 | |||
223 | /* |
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224 | * We found the area containing 'page'. |
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225 | * TODO: access checking |
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226 | */ |
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227 | area = a; |
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228 | break; |
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229 | } |
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230 | |||
231 | spinlock_unlock(&a->lock); |
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232 | } |
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233 | |||
234 | if (!area) { |
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235 | /* |
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236 | * No area contained mapping for 'page'. |
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237 | * Signal page fault to low-level handler. |
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238 | */ |
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239 | spinlock_unlock(&AS->lock); |
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240 | return 0; |
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241 | } |
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242 | |||
243 | /* |
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244 | * Note: area->lock is held. |
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245 | */ |
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246 | |||
247 | /* |
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754 | jermar | 248 | * In general, there can be several reasons that |
249 | * can have caused this fault. |
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250 | * |
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251 | * - non-existent mapping: the area is a scratch |
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252 | * area (e.g. stack) and so far has not been |
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253 | * allocated a frame for the faulting page |
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254 | * |
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255 | * - non-present mapping: another possibility, |
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256 | * currently not implemented, would be frame |
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257 | * reuse; when this becomes a possibility, |
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258 | * do not forget to distinguish between |
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259 | * the different causes |
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703 | jermar | 260 | */ |
754 | jermar | 261 | frame = frame_alloc(0, ONE_FRAME, NULL); |
262 | memsetb(PA2KA(frame), FRAME_SIZE, 0); |
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703 | jermar | 263 | |
264 | /* |
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265 | * Map 'page' to 'frame'. |
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266 | * Note that TLB shootdown is not attempted as only new information is being |
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267 | * inserted into page tables. |
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268 | */ |
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755 | jermar | 269 | page_mapping_insert(AS, page, frame, get_area_flags(area), (__address) AS->ptl0); |
703 | jermar | 270 | |
271 | spinlock_unlock(&area->lock); |
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272 | spinlock_unlock(&AS->lock); |
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273 | |||
274 | return 1; |
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275 | } |
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276 | |||
277 | /** Install address space on CPU. |
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278 | * |
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279 | * @param as Address space. |
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280 | */ |
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281 | void as_install(as_t *as) |
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282 | { |
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283 | ipl_t ipl; |
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284 | |||
727 | jermar | 285 | asid_install(as); |
286 | |||
703 | jermar | 287 | ipl = interrupts_disable(); |
288 | spinlock_lock(&as->lock); |
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289 | ASSERT(as->ptl0); |
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290 | SET_PTL0_ADDRESS(as->ptl0); |
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291 | spinlock_unlock(&as->lock); |
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292 | interrupts_restore(ipl); |
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293 | |||
294 | /* |
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295 | * Perform architecture-specific steps. |
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727 | jermar | 296 | * (e.g. write ASID to hardware register etc.) |
703 | jermar | 297 | */ |
298 | as_install_arch(as); |
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299 | |||
300 | AS = as; |
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301 | } |
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754 | jermar | 302 | |
303 | /** Compute flags for virtual address translation subsytem. |
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304 | * |
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305 | * The address space area must be locked. |
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306 | * Interrupts must be disabled. |
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307 | * |
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308 | * @param a Address space area. |
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309 | * |
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310 | * @return Flags to be used in page_mapping_insert(). |
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311 | */ |
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312 | int get_area_flags(as_area_t *a) |
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313 | { |
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314 | int flags; |
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315 | |||
316 | switch (a->type) { |
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317 | case AS_AREA_TEXT: |
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318 | flags = PAGE_EXEC | PAGE_READ | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE; |
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319 | break; |
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320 | case AS_AREA_DATA: |
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321 | case AS_AREA_STACK: |
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322 | flags = PAGE_READ | PAGE_WRITE | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE; |
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323 | break; |
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324 | default: |
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325 | panic("unexpected as_area_type_t %d", a->type); |
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326 | } |
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327 | |||
328 | return flags; |
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329 | } |