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1 | /* |
1 | /* |
2 | * Copyright (C) 2001-2006 Jakub Jermar |
2 | * Copyright (C) 2001-2006 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /* |
29 | /* |
30 | * This file contains address space manipulation functions. |
30 | * This file contains address space manipulation functions. |
31 | * Roughly speaking, this is a higher-level client of |
31 | * Roughly speaking, this is a higher-level client of |
32 | * Virtual Address Translation (VAT) subsystem. |
32 | * Virtual Address Translation (VAT) subsystem. |
33 | */ |
33 | */ |
34 | 34 | ||
35 | #include <mm/as.h> |
35 | #include <mm/as.h> |
36 | #include <arch/mm/as.h> |
36 | #include <arch/mm/as.h> |
37 | #include <mm/page.h> |
37 | #include <mm/page.h> |
38 | #include <mm/frame.h> |
38 | #include <mm/frame.h> |
39 | #include <mm/tlb.h> |
39 | #include <mm/tlb.h> |
40 | #include <mm/heap.h> |
40 | #include <mm/heap.h> |
41 | #include <arch/mm/page.h> |
41 | #include <arch/mm/page.h> |
42 | #include <genarch/mm/page_pt.h> |
42 | #include <genarch/mm/page_pt.h> |
43 | #include <mm/asid.h> |
43 | #include <mm/asid.h> |
44 | #include <arch/mm/asid.h> |
44 | #include <arch/mm/asid.h> |
45 | #include <arch/types.h> |
45 | #include <arch/types.h> |
46 | #include <typedefs.h> |
46 | #include <typedefs.h> |
47 | #include <synch/spinlock.h> |
47 | #include <synch/spinlock.h> |
48 | #include <config.h> |
48 | #include <config.h> |
49 | #include <list.h> |
49 | #include <list.h> |
50 | #include <panic.h> |
50 | #include <panic.h> |
51 | #include <arch/asm.h> |
51 | #include <arch/asm.h> |
52 | #include <debug.h> |
52 | #include <debug.h> |
53 | #include <memstr.h> |
53 | #include <memstr.h> |
54 | #include <arch.h> |
54 | #include <arch.h> |
55 | #include <print.h> |
55 | #include <print.h> |
56 | 56 | ||
57 | as_operations_t *as_operations = NULL; |
57 | as_operations_t *as_operations = NULL; |
58 | 58 | ||
- | 59 | /** Kernel address space. */ |
|
- | 60 | as_t *AS_KERNEL = NULL; |
|
- | 61 | ||
59 | static int get_area_flags(as_area_t *a); |
62 | static int get_area_flags(as_area_t *a); |
60 | 63 | ||
61 | /** Initialize address space subsystem. */ |
64 | /** Initialize address space subsystem. */ |
62 | void as_init(void) |
65 | void as_init(void) |
63 | { |
66 | { |
64 | as_arch_init(); |
67 | as_arch_init(); |
65 | AS_KERNEL = as_create(FLAG_AS_KERNEL); |
68 | AS_KERNEL = as_create(FLAG_AS_KERNEL); |
66 | if (!AS_KERNEL) |
69 | if (!AS_KERNEL) |
67 | panic("can't create kernel address space\n"); |
70 | panic("can't create kernel address space\n"); |
68 | } |
71 | } |
69 | 72 | ||
70 | /** Create address space. */ |
73 | /** Create address space. |
- | 74 | * |
|
- | 75 | * @param flags Flags that influence way in wich the address space is created. |
|
- | 76 | */ |
|
71 | as_t *as_create(int flags) |
77 | as_t *as_create(int flags) |
72 | { |
78 | { |
73 | as_t *as; |
79 | as_t *as; |
74 | 80 | ||
75 | as = (as_t *) malloc(sizeof(as_t)); |
81 | as = (as_t *) malloc(sizeof(as_t)); |
76 | if (as) { |
82 | if (as) { |
77 | list_initialize(&as->as_with_asid_link); |
83 | list_initialize(&as->as_with_asid_link); |
78 | spinlock_initialize(&as->lock, "as_lock"); |
84 | spinlock_initialize(&as->lock, "as_lock"); |
79 | list_initialize(&as->as_area_head); |
85 | list_initialize(&as->as_area_head); |
80 | 86 | ||
81 | if (flags & FLAG_AS_KERNEL) |
87 | if (flags & FLAG_AS_KERNEL) |
82 | as->asid = ASID_KERNEL; |
88 | as->asid = ASID_KERNEL; |
83 | else |
89 | else |
84 | as->asid = ASID_INVALID; |
90 | as->asid = ASID_INVALID; |
85 | 91 | ||
86 | as->page_table = page_table_create(flags); |
92 | as->page_table = page_table_create(flags); |
87 | } |
93 | } |
88 | 94 | ||
89 | return as; |
95 | return as; |
90 | } |
96 | } |
91 | 97 | ||
92 | /** Create address space area of common attributes. |
98 | /** Create address space area of common attributes. |
93 | * |
99 | * |
94 | * The created address space area is added to the target address space. |
100 | * The created address space area is added to the target address space. |
95 | * |
101 | * |
96 | * @param as Target address space. |
102 | * @param as Target address space. |
97 | * @param type Type of area. |
103 | * @param type Type of area. |
98 | * @param size Size of area in multiples of PAGE_SIZE. |
104 | * @param size Size of area in multiples of PAGE_SIZE. |
99 | * @param base Base address of area. |
105 | * @param base Base address of area. |
100 | * |
106 | * |
101 | * @return Address space area on success or NULL on failure. |
107 | * @return Address space area on success or NULL on failure. |
102 | */ |
108 | */ |
103 | as_area_t *as_area_create(as_t *as, as_area_type_t type, size_t size, __address base) |
109 | as_area_t *as_area_create(as_t *as, as_area_type_t type, size_t size, __address base) |
104 | { |
110 | { |
105 | ipl_t ipl; |
111 | ipl_t ipl; |
106 | as_area_t *a; |
112 | as_area_t *a; |
107 | 113 | ||
108 | if (base % PAGE_SIZE) |
114 | if (base % PAGE_SIZE) |
109 | panic("addr not aligned to a page boundary"); |
115 | panic("addr not aligned to a page boundary"); |
110 | 116 | ||
111 | ipl = interrupts_disable(); |
117 | ipl = interrupts_disable(); |
112 | spinlock_lock(&as->lock); |
118 | spinlock_lock(&as->lock); |
113 | 119 | ||
114 | /* |
120 | /* |
115 | * TODO: test as_area which is to be created doesn't overlap with an existing one. |
121 | * TODO: test as_area which is to be created doesn't overlap with an existing one. |
116 | */ |
122 | */ |
117 | 123 | ||
118 | a = (as_area_t *) malloc(sizeof(as_area_t)); |
124 | a = (as_area_t *) malloc(sizeof(as_area_t)); |
119 | if (a) { |
125 | if (a) { |
120 | spinlock_initialize(&a->lock, "as_area_lock"); |
126 | spinlock_initialize(&a->lock, "as_area_lock"); |
121 | 127 | ||
122 | link_initialize(&a->link); |
128 | link_initialize(&a->link); |
123 | a->type = type; |
129 | a->type = type; |
124 | a->size = size; |
130 | a->size = size; |
125 | a->base = base; |
131 | a->base = base; |
126 | 132 | ||
127 | list_append(&a->link, &as->as_area_head); |
133 | list_append(&a->link, &as->as_area_head); |
128 | } |
134 | } |
129 | 135 | ||
130 | spinlock_unlock(&as->lock); |
136 | spinlock_unlock(&as->lock); |
131 | interrupts_restore(ipl); |
137 | interrupts_restore(ipl); |
132 | 138 | ||
133 | return a; |
139 | return a; |
134 | } |
140 | } |
135 | 141 | ||
136 | /** Initialize mapping for one page of address space. |
142 | /** Initialize mapping for one page of address space. |
137 | * |
143 | * |
138 | * This functions maps 'page' to 'frame' according |
144 | * This functions maps 'page' to 'frame' according |
139 | * to attributes of the address space area to |
145 | * to attributes of the address space area to |
140 | * wich 'page' belongs. |
146 | * wich 'page' belongs. |
141 | * |
147 | * |
142 | * @param a Target address space. |
148 | * @param a Target address space. |
143 | * @param page Virtual page within the area. |
149 | * @param page Virtual page within the area. |
144 | * @param frame Physical frame to which page will be mapped. |
150 | * @param frame Physical frame to which page will be mapped. |
145 | */ |
151 | */ |
146 | void as_set_mapping(as_t *as, __address page, __address frame) |
152 | void as_set_mapping(as_t *as, __address page, __address frame) |
147 | { |
153 | { |
148 | as_area_t *a, *area = NULL; |
154 | as_area_t *a, *area = NULL; |
149 | link_t *cur; |
155 | link_t *cur; |
150 | ipl_t ipl; |
156 | ipl_t ipl; |
151 | 157 | ||
152 | ipl = interrupts_disable(); |
158 | ipl = interrupts_disable(); |
153 | spinlock_lock(&as->lock); |
159 | spinlock_lock(&as->lock); |
154 | 160 | ||
155 | /* |
161 | /* |
156 | * First, try locate an area. |
162 | * First, try locate an area. |
157 | */ |
163 | */ |
158 | for (cur = as->as_area_head.next; cur != &as->as_area_head; cur = cur->next) { |
164 | for (cur = as->as_area_head.next; cur != &as->as_area_head; cur = cur->next) { |
159 | a = list_get_instance(cur, as_area_t, link); |
165 | a = list_get_instance(cur, as_area_t, link); |
160 | spinlock_lock(&a->lock); |
166 | spinlock_lock(&a->lock); |
161 | 167 | ||
162 | if ((page >= a->base) && (page < a->base + a->size * PAGE_SIZE)) { |
168 | if ((page >= a->base) && (page < a->base + a->size * PAGE_SIZE)) { |
163 | area = a; |
169 | area = a; |
164 | break; |
170 | break; |
165 | } |
171 | } |
166 | 172 | ||
167 | spinlock_unlock(&a->lock); |
173 | spinlock_unlock(&a->lock); |
168 | } |
174 | } |
169 | 175 | ||
170 | if (!area) { |
176 | if (!area) { |
171 | panic("page not part of any as_area\n"); |
177 | panic("page not part of any as_area\n"); |
172 | } |
178 | } |
173 | 179 | ||
174 | /* |
180 | /* |
175 | * Note: area->lock is held. |
181 | * Note: area->lock is held. |
176 | */ |
182 | */ |
177 | 183 | ||
178 | page_mapping_insert(as, page, frame, get_area_flags(area)); |
184 | page_mapping_insert(as, page, frame, get_area_flags(area)); |
179 | 185 | ||
180 | spinlock_unlock(&area->lock); |
186 | spinlock_unlock(&area->lock); |
181 | spinlock_unlock(&as->lock); |
187 | spinlock_unlock(&as->lock); |
182 | interrupts_restore(ipl); |
188 | interrupts_restore(ipl); |
183 | } |
189 | } |
184 | 190 | ||
185 | /** Handle page fault within the current address space. |
191 | /** Handle page fault within the current address space. |
186 | * |
192 | * |
187 | * This is the high-level page fault handler. |
193 | * This is the high-level page fault handler. |
188 | * Interrupts are assumed disabled. |
194 | * Interrupts are assumed disabled. |
189 | * |
195 | * |
190 | * @param page Faulting page. |
196 | * @param page Faulting page. |
191 | * |
197 | * |
192 | * @return 0 on page fault, 1 on success. |
198 | * @return 0 on page fault, 1 on success. |
193 | */ |
199 | */ |
194 | int as_page_fault(__address page) |
200 | int as_page_fault(__address page) |
195 | { |
201 | { |
196 | link_t *cur; |
202 | link_t *cur; |
197 | as_area_t *a, *area = NULL; |
203 | as_area_t *a, *area = NULL; |
198 | __address frame; |
204 | __address frame; |
199 | 205 | ||
200 | ASSERT(AS); |
206 | ASSERT(AS); |
201 | spinlock_lock(&AS->lock); |
207 | spinlock_lock(&AS->lock); |
202 | 208 | ||
203 | /* |
209 | /* |
204 | * Search this areas of this address space for presence of 'page'. |
210 | * Search this areas of this address space for presence of 'page'. |
205 | */ |
211 | */ |
206 | for (cur = AS->as_area_head.next; cur != &AS->as_area_head; cur = cur->next) { |
212 | for (cur = AS->as_area_head.next; cur != &AS->as_area_head; cur = cur->next) { |
207 | a = list_get_instance(cur, as_area_t, link); |
213 | a = list_get_instance(cur, as_area_t, link); |
208 | spinlock_lock(&a->lock); |
214 | spinlock_lock(&a->lock); |
209 | 215 | ||
210 | if ((page >= a->base) && (page < a->base + a->size * PAGE_SIZE)) { |
216 | if ((page >= a->base) && (page < a->base + a->size * PAGE_SIZE)) { |
211 | 217 | ||
212 | /* |
218 | /* |
213 | * We found the area containing 'page'. |
219 | * We found the area containing 'page'. |
214 | * TODO: access checking |
220 | * TODO: access checking |
215 | */ |
221 | */ |
216 | area = a; |
222 | area = a; |
217 | break; |
223 | break; |
218 | } |
224 | } |
219 | 225 | ||
220 | spinlock_unlock(&a->lock); |
226 | spinlock_unlock(&a->lock); |
221 | } |
227 | } |
222 | 228 | ||
223 | if (!area) { |
229 | if (!area) { |
224 | /* |
230 | /* |
225 | * No area contained mapping for 'page'. |
231 | * No area contained mapping for 'page'. |
226 | * Signal page fault to low-level handler. |
232 | * Signal page fault to low-level handler. |
227 | */ |
233 | */ |
228 | spinlock_unlock(&AS->lock); |
234 | spinlock_unlock(&AS->lock); |
229 | return 0; |
235 | return 0; |
230 | } |
236 | } |
231 | 237 | ||
232 | /* |
238 | /* |
233 | * Note: area->lock is held. |
239 | * Note: area->lock is held. |
234 | */ |
240 | */ |
235 | 241 | ||
236 | /* |
242 | /* |
237 | * In general, there can be several reasons that |
243 | * In general, there can be several reasons that |
238 | * can have caused this fault. |
244 | * can have caused this fault. |
239 | * |
245 | * |
240 | * - non-existent mapping: the area is a scratch |
246 | * - non-existent mapping: the area is a scratch |
241 | * area (e.g. stack) and so far has not been |
247 | * area (e.g. stack) and so far has not been |
242 | * allocated a frame for the faulting page |
248 | * allocated a frame for the faulting page |
243 | * |
249 | * |
244 | * - non-present mapping: another possibility, |
250 | * - non-present mapping: another possibility, |
245 | * currently not implemented, would be frame |
251 | * currently not implemented, would be frame |
246 | * reuse; when this becomes a possibility, |
252 | * reuse; when this becomes a possibility, |
247 | * do not forget to distinguish between |
253 | * do not forget to distinguish between |
248 | * the different causes |
254 | * the different causes |
249 | */ |
255 | */ |
250 | frame = frame_alloc(0, ONE_FRAME, NULL); |
256 | frame = frame_alloc(0, ONE_FRAME, NULL); |
251 | memsetb(PA2KA(frame), FRAME_SIZE, 0); |
257 | memsetb(PA2KA(frame), FRAME_SIZE, 0); |
252 | 258 | ||
253 | /* |
259 | /* |
254 | * Map 'page' to 'frame'. |
260 | * Map 'page' to 'frame'. |
255 | * Note that TLB shootdown is not attempted as only new information is being |
261 | * Note that TLB shootdown is not attempted as only new information is being |
256 | * inserted into page tables. |
262 | * inserted into page tables. |
257 | */ |
263 | */ |
258 | page_mapping_insert(AS, page, frame, get_area_flags(area)); |
264 | page_mapping_insert(AS, page, frame, get_area_flags(area)); |
259 | 265 | ||
260 | spinlock_unlock(&area->lock); |
266 | spinlock_unlock(&area->lock); |
261 | spinlock_unlock(&AS->lock); |
267 | spinlock_unlock(&AS->lock); |
262 | 268 | ||
263 | return 1; |
269 | return 1; |
264 | } |
270 | } |
265 | 271 | ||
266 | /** Install address space on CPU. |
272 | /** Install address space on CPU. |
267 | * |
273 | * |
268 | * @param as Address space. |
274 | * @param as Address space. |
269 | */ |
275 | */ |
270 | void as_install(as_t *as) |
276 | void as_install(as_t *as) |
271 | { |
277 | { |
272 | ipl_t ipl; |
278 | ipl_t ipl; |
273 | 279 | ||
274 | asid_install(as); |
280 | asid_install(as); |
275 | 281 | ||
276 | ipl = interrupts_disable(); |
282 | ipl = interrupts_disable(); |
277 | spinlock_lock(&as->lock); |
283 | spinlock_lock(&as->lock); |
278 | ASSERT(as->page_table); |
284 | ASSERT(as->page_table); |
279 | SET_PTL0_ADDRESS(as->page_table); |
285 | SET_PTL0_ADDRESS(as->page_table); |
280 | spinlock_unlock(&as->lock); |
286 | spinlock_unlock(&as->lock); |
281 | interrupts_restore(ipl); |
287 | interrupts_restore(ipl); |
282 | 288 | ||
283 | /* |
289 | /* |
284 | * Perform architecture-specific steps. |
290 | * Perform architecture-specific steps. |
285 | * (e.g. write ASID to hardware register etc.) |
291 | * (e.g. write ASID to hardware register etc.) |
286 | */ |
292 | */ |
287 | as_install_arch(as); |
293 | as_install_arch(as); |
288 | 294 | ||
289 | AS = as; |
295 | AS = as; |
290 | } |
296 | } |
291 | 297 | ||
292 | /** Compute flags for virtual address translation subsytem. |
298 | /** Compute flags for virtual address translation subsytem. |
293 | * |
299 | * |
294 | * The address space area must be locked. |
300 | * The address space area must be locked. |
295 | * Interrupts must be disabled. |
301 | * Interrupts must be disabled. |
296 | * |
302 | * |
297 | * @param a Address space area. |
303 | * @param a Address space area. |
298 | * |
304 | * |
299 | * @return Flags to be used in page_mapping_insert(). |
305 | * @return Flags to be used in page_mapping_insert(). |
300 | */ |
306 | */ |
301 | int get_area_flags(as_area_t *a) |
307 | int get_area_flags(as_area_t *a) |
302 | { |
308 | { |
303 | int flags; |
309 | int flags; |
304 | 310 | ||
305 | switch (a->type) { |
311 | switch (a->type) { |
306 | case AS_AREA_TEXT: |
312 | case AS_AREA_TEXT: |
307 | flags = PAGE_EXEC | PAGE_READ | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE; |
313 | flags = PAGE_EXEC | PAGE_READ | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE; |
308 | break; |
314 | break; |
309 | case AS_AREA_DATA: |
315 | case AS_AREA_DATA: |
310 | case AS_AREA_STACK: |
316 | case AS_AREA_STACK: |
311 | flags = PAGE_READ | PAGE_WRITE | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE; |
317 | flags = PAGE_READ | PAGE_WRITE | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE; |
312 | break; |
318 | break; |
313 | default: |
319 | default: |
314 | panic("unexpected as_area_type_t %d", a->type); |
320 | panic("unexpected as_area_type_t %d", a->type); |
315 | } |
321 | } |
316 | 322 | ||
317 | return flags; |
323 | return flags; |
318 | } |
324 | } |
319 | 325 | ||
320 | /** Create page table. |
326 | /** Create page table. |
321 | * |
327 | * |
322 | * Depending on architecture, create either address space |
328 | * Depending on architecture, create either address space |
323 | * private or global page table. |
329 | * private or global page table. |
324 | * |
330 | * |
325 | * @param flags Flags saying whether the page table is for kernel address space. |
331 | * @param flags Flags saying whether the page table is for kernel address space. |
326 | * |
332 | * |
327 | * @return First entry of the page table. |
333 | * @return First entry of the page table. |
328 | */ |
334 | */ |
329 | pte_t *page_table_create(int flags) |
335 | pte_t *page_table_create(int flags) |
330 | { |
336 | { |
331 | ASSERT(as_operations); |
337 | ASSERT(as_operations); |
332 | ASSERT(as_operations->page_table_create); |
338 | ASSERT(as_operations->page_table_create); |
333 | 339 | ||
334 | return as_operations->page_table_create(flags); |
340 | return as_operations->page_table_create(flags); |
335 | } |
341 | } |
336 | 342 |