Rev 1411 | Rev 1415 | Go to most recent revision | Only display areas with differences | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed
Rev 1411 | Rev 1413 | ||
---|---|---|---|
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 | * @file as.c |
30 | * @file as.c |
31 | * @brief Address space related functions. |
31 | * @brief Address space related functions. |
32 | * |
32 | * |
33 | * This file contains address space manipulation functions. |
33 | * This file contains address space manipulation functions. |
34 | * Roughly speaking, this is a higher-level client of |
34 | * Roughly speaking, this is a higher-level client of |
35 | * Virtual Address Translation (VAT) subsystem. |
35 | * Virtual Address Translation (VAT) subsystem. |
36 | * |
36 | * |
37 | * Functionality provided by this file allows one to |
37 | * Functionality provided by this file allows one to |
38 | * create address space and create, resize and share |
38 | * create address space and create, resize and share |
39 | * address space areas. |
39 | * address space areas. |
40 | * |
40 | * |
41 | * @see page.c |
41 | * @see page.c |
42 | * |
42 | * |
43 | */ |
43 | */ |
44 | 44 | ||
45 | #include <mm/as.h> |
45 | #include <mm/as.h> |
46 | #include <arch/mm/as.h> |
46 | #include <arch/mm/as.h> |
47 | #include <mm/page.h> |
47 | #include <mm/page.h> |
48 | #include <mm/frame.h> |
48 | #include <mm/frame.h> |
49 | #include <mm/slab.h> |
49 | #include <mm/slab.h> |
50 | #include <mm/tlb.h> |
50 | #include <mm/tlb.h> |
51 | #include <arch/mm/page.h> |
51 | #include <arch/mm/page.h> |
52 | #include <genarch/mm/page_pt.h> |
52 | #include <genarch/mm/page_pt.h> |
53 | #include <genarch/mm/page_ht.h> |
53 | #include <genarch/mm/page_ht.h> |
54 | #include <mm/asid.h> |
54 | #include <mm/asid.h> |
55 | #include <arch/mm/asid.h> |
55 | #include <arch/mm/asid.h> |
56 | #include <synch/spinlock.h> |
56 | #include <synch/spinlock.h> |
57 | #include <synch/mutex.h> |
57 | #include <synch/mutex.h> |
58 | #include <adt/list.h> |
58 | #include <adt/list.h> |
59 | #include <adt/btree.h> |
59 | #include <adt/btree.h> |
60 | #include <proc/task.h> |
60 | #include <proc/task.h> |
61 | #include <proc/thread.h> |
61 | #include <proc/thread.h> |
62 | #include <arch/asm.h> |
62 | #include <arch/asm.h> |
63 | #include <panic.h> |
63 | #include <panic.h> |
64 | #include <debug.h> |
64 | #include <debug.h> |
65 | #include <print.h> |
65 | #include <print.h> |
66 | #include <memstr.h> |
66 | #include <memstr.h> |
67 | #include <macros.h> |
67 | #include <macros.h> |
68 | #include <arch.h> |
68 | #include <arch.h> |
69 | #include <errno.h> |
69 | #include <errno.h> |
70 | #include <config.h> |
70 | #include <config.h> |
71 | #include <align.h> |
71 | #include <align.h> |
72 | #include <arch/types.h> |
72 | #include <arch/types.h> |
73 | #include <typedefs.h> |
73 | #include <typedefs.h> |
74 | #include <syscall/copy.h> |
74 | #include <syscall/copy.h> |
75 | #include <arch/interrupt.h> |
75 | #include <arch/interrupt.h> |
76 | 76 | ||
77 | /** This structure contains information associated with the shared address space area. */ |
77 | /** This structure contains information associated with the shared address space area. */ |
78 | struct share_info { |
78 | struct share_info { |
79 | mutex_t lock; /**< This lock must be acquired only when the as_area lock is held. */ |
79 | mutex_t lock; /**< This lock must be acquired only when the as_area lock is held. */ |
80 | count_t refcount; /**< This structure can be deallocated if refcount drops to 0. */ |
80 | count_t refcount; /**< This structure can be deallocated if refcount drops to 0. */ |
81 | btree_t pagemap; /**< B+tree containing complete map of anonymous pages of the shared area. */ |
81 | btree_t pagemap; /**< B+tree containing complete map of anonymous pages of the shared area. */ |
82 | }; |
82 | }; |
83 | 83 | ||
84 | as_operations_t *as_operations = NULL; |
84 | as_operations_t *as_operations = NULL; |
85 | 85 | ||
86 | /** Address space lock. It protects inactive_as_with_asid_head. Must be acquired before as_t mutex. */ |
86 | /** Address space lock. It protects inactive_as_with_asid_head. Must be acquired before as_t mutex. */ |
87 | SPINLOCK_INITIALIZE(as_lock); |
87 | SPINLOCK_INITIALIZE(as_lock); |
88 | 88 | ||
89 | /** |
89 | /** |
90 | * This list contains address spaces that are not active on any |
90 | * This list contains address spaces that are not active on any |
91 | * processor and that have valid ASID. |
91 | * processor and that have valid ASID. |
92 | */ |
92 | */ |
93 | LIST_INITIALIZE(inactive_as_with_asid_head); |
93 | LIST_INITIALIZE(inactive_as_with_asid_head); |
94 | 94 | ||
95 | /** Kernel address space. */ |
95 | /** Kernel address space. */ |
96 | as_t *AS_KERNEL = NULL; |
96 | as_t *AS_KERNEL = NULL; |
97 | 97 | ||
98 | static int area_flags_to_page_flags(int aflags); |
98 | static int area_flags_to_page_flags(int aflags); |
99 | static as_area_t *find_area_and_lock(as_t *as, __address va); |
99 | static as_area_t *find_area_and_lock(as_t *as, __address va); |
100 | static bool check_area_conflicts(as_t *as, __address va, size_t size, as_area_t *avoid_area); |
100 | static bool check_area_conflicts(as_t *as, __address va, size_t size, as_area_t *avoid_area); |
101 | static void sh_info_remove_reference(share_info_t *sh_info); |
101 | static void sh_info_remove_reference(share_info_t *sh_info); |
102 | 102 | ||
103 | /** Initialize address space subsystem. */ |
103 | /** Initialize address space subsystem. */ |
104 | void as_init(void) |
104 | void as_init(void) |
105 | { |
105 | { |
106 | as_arch_init(); |
106 | as_arch_init(); |
107 | AS_KERNEL = as_create(FLAG_AS_KERNEL); |
107 | AS_KERNEL = as_create(FLAG_AS_KERNEL); |
108 | if (!AS_KERNEL) |
108 | if (!AS_KERNEL) |
109 | panic("can't create kernel address space\n"); |
109 | panic("can't create kernel address space\n"); |
110 | 110 | ||
111 | } |
111 | } |
112 | 112 | ||
113 | /** Create address space. |
113 | /** Create address space. |
114 | * |
114 | * |
115 | * @param flags Flags that influence way in wich the address space is created. |
115 | * @param flags Flags that influence way in wich the address space is created. |
116 | */ |
116 | */ |
117 | as_t *as_create(int flags) |
117 | as_t *as_create(int flags) |
118 | { |
118 | { |
119 | as_t *as; |
119 | as_t *as; |
120 | 120 | ||
121 | as = (as_t *) malloc(sizeof(as_t), 0); |
121 | as = (as_t *) malloc(sizeof(as_t), 0); |
122 | link_initialize(&as->inactive_as_with_asid_link); |
122 | link_initialize(&as->inactive_as_with_asid_link); |
123 | mutex_initialize(&as->lock); |
123 | mutex_initialize(&as->lock); |
124 | btree_create(&as->as_area_btree); |
124 | btree_create(&as->as_area_btree); |
125 | 125 | ||
126 | if (flags & FLAG_AS_KERNEL) |
126 | if (flags & FLAG_AS_KERNEL) |
127 | as->asid = ASID_KERNEL; |
127 | as->asid = ASID_KERNEL; |
128 | else |
128 | else |
129 | as->asid = ASID_INVALID; |
129 | as->asid = ASID_INVALID; |
130 | 130 | ||
131 | as->refcount = 0; |
131 | as->refcount = 0; |
132 | as->page_table = page_table_create(flags); |
132 | as->page_table = page_table_create(flags); |
133 | 133 | ||
134 | return as; |
134 | return as; |
135 | } |
135 | } |
136 | 136 | ||
137 | /** Free Adress space */ |
137 | /** Free Adress space */ |
138 | void as_free(as_t *as) |
138 | void as_free(as_t *as) |
139 | { |
139 | { |
140 | ASSERT(as->refcount == 0); |
140 | ASSERT(as->refcount == 0); |
141 | 141 | ||
142 | /* TODO: free as_areas and other resources held by as */ |
142 | /* TODO: free as_areas and other resources held by as */ |
143 | /* TODO: free page table */ |
143 | /* TODO: free page table */ |
144 | free(as); |
144 | free(as); |
145 | } |
145 | } |
146 | 146 | ||
147 | /** Create address space area of common attributes. |
147 | /** Create address space area of common attributes. |
148 | * |
148 | * |
149 | * The created address space area is added to the target address space. |
149 | * The created address space area is added to the target address space. |
150 | * |
150 | * |
151 | * @param as Target address space. |
151 | * @param as Target address space. |
152 | * @param flags Flags of the area memory. |
152 | * @param flags Flags of the area memory. |
153 | * @param size Size of area. |
153 | * @param size Size of area. |
154 | * @param base Base address of area. |
154 | * @param base Base address of area. |
155 | * @param attrs Attributes of the area. |
155 | * @param attrs Attributes of the area. |
156 | * @param backend Address space area backend. NULL if no backend is used. |
156 | * @param backend Address space area backend. NULL if no backend is used. |
157 | * @param backend_data NULL or a pointer to an array holding two void *. |
157 | * @param backend_data NULL or a pointer to an array holding two void *. |
158 | * |
158 | * |
159 | * @return Address space area on success or NULL on failure. |
159 | * @return Address space area on success or NULL on failure. |
160 | */ |
160 | */ |
161 | as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs, |
161 | as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs, |
162 | mem_backend_t *backend, void **backend_data) |
162 | mem_backend_t *backend, void **backend_data) |
163 | { |
163 | { |
164 | ipl_t ipl; |
164 | ipl_t ipl; |
165 | as_area_t *a; |
165 | as_area_t *a; |
166 | 166 | ||
167 | if (base % PAGE_SIZE) |
167 | if (base % PAGE_SIZE) |
168 | return NULL; |
168 | return NULL; |
169 | 169 | ||
170 | if (!size) |
170 | if (!size) |
171 | return NULL; |
171 | return NULL; |
172 | 172 | ||
173 | /* Writeable executable areas are not supported. */ |
173 | /* Writeable executable areas are not supported. */ |
174 | if ((flags & AS_AREA_EXEC) && (flags & AS_AREA_WRITE)) |
174 | if ((flags & AS_AREA_EXEC) && (flags & AS_AREA_WRITE)) |
175 | return NULL; |
175 | return NULL; |
176 | 176 | ||
177 | ipl = interrupts_disable(); |
177 | ipl = interrupts_disable(); |
178 | mutex_lock(&as->lock); |
178 | mutex_lock(&as->lock); |
179 | 179 | ||
180 | if (!check_area_conflicts(as, base, size, NULL)) { |
180 | if (!check_area_conflicts(as, base, size, NULL)) { |
181 | mutex_unlock(&as->lock); |
181 | mutex_unlock(&as->lock); |
182 | interrupts_restore(ipl); |
182 | interrupts_restore(ipl); |
183 | return NULL; |
183 | return NULL; |
184 | } |
184 | } |
185 | 185 | ||
186 | a = (as_area_t *) malloc(sizeof(as_area_t), 0); |
186 | a = (as_area_t *) malloc(sizeof(as_area_t), 0); |
187 | 187 | ||
188 | mutex_initialize(&a->lock); |
188 | mutex_initialize(&a->lock); |
189 | 189 | ||
190 | a->flags = flags; |
190 | a->flags = flags; |
191 | a->attributes = attrs; |
191 | a->attributes = attrs; |
192 | a->pages = SIZE2FRAMES(size); |
192 | a->pages = SIZE2FRAMES(size); |
193 | a->base = base; |
193 | a->base = base; |
194 | a->sh_info = NULL; |
194 | a->sh_info = NULL; |
195 | a->backend = backend; |
195 | a->backend = backend; |
196 | if (backend_data) { |
196 | if (backend_data) { |
197 | a->backend_data[0] = backend_data[0]; |
197 | a->backend_data[0] = backend_data[0]; |
198 | a->backend_data[1] = backend_data[1]; |
198 | a->backend_data[1] = backend_data[1]; |
199 | } |
199 | } |
200 | btree_create(&a->used_space); |
200 | btree_create(&a->used_space); |
201 | 201 | ||
202 | btree_insert(&as->as_area_btree, base, (void *) a, NULL); |
202 | btree_insert(&as->as_area_btree, base, (void *) a, NULL); |
203 | 203 | ||
204 | mutex_unlock(&as->lock); |
204 | mutex_unlock(&as->lock); |
205 | interrupts_restore(ipl); |
205 | interrupts_restore(ipl); |
206 | 206 | ||
207 | return a; |
207 | return a; |
208 | } |
208 | } |
209 | 209 | ||
210 | /** Find address space area and change it. |
210 | /** Find address space area and change it. |
211 | * |
211 | * |
212 | * @param as Address space. |
212 | * @param as Address space. |
213 | * @param address Virtual address belonging to the area to be changed. Must be page-aligned. |
213 | * @param address Virtual address belonging to the area to be changed. Must be page-aligned. |
214 | * @param size New size of the virtual memory block starting at address. |
214 | * @param size New size of the virtual memory block starting at address. |
215 | * @param flags Flags influencing the remap operation. Currently unused. |
215 | * @param flags Flags influencing the remap operation. Currently unused. |
216 | * |
216 | * |
217 | * @return Zero on success or a value from @ref errno.h otherwise. |
217 | * @return Zero on success or a value from @ref errno.h otherwise. |
218 | */ |
218 | */ |
219 | int as_area_resize(as_t *as, __address address, size_t size, int flags) |
219 | int as_area_resize(as_t *as, __address address, size_t size, int flags) |
220 | { |
220 | { |
221 | as_area_t *area; |
221 | as_area_t *area; |
222 | ipl_t ipl; |
222 | ipl_t ipl; |
223 | size_t pages; |
223 | size_t pages; |
224 | 224 | ||
225 | ipl = interrupts_disable(); |
225 | ipl = interrupts_disable(); |
226 | mutex_lock(&as->lock); |
226 | mutex_lock(&as->lock); |
227 | 227 | ||
228 | /* |
228 | /* |
229 | * Locate the area. |
229 | * Locate the area. |
230 | */ |
230 | */ |
231 | area = find_area_and_lock(as, address); |
231 | area = find_area_and_lock(as, address); |
232 | if (!area) { |
232 | if (!area) { |
233 | mutex_unlock(&as->lock); |
233 | mutex_unlock(&as->lock); |
234 | interrupts_restore(ipl); |
234 | interrupts_restore(ipl); |
235 | return ENOENT; |
235 | return ENOENT; |
236 | } |
236 | } |
237 | 237 | ||
238 | if (area->flags & AS_AREA_DEVICE) { |
238 | if (area->flags & AS_AREA_DEVICE) { |
239 | /* |
239 | /* |
240 | * Remapping of address space areas associated |
240 | * Remapping of address space areas associated |
241 | * with memory mapped devices is not supported. |
241 | * with memory mapped devices is not supported. |
242 | */ |
242 | */ |
243 | mutex_unlock(&area->lock); |
243 | mutex_unlock(&area->lock); |
244 | mutex_unlock(&as->lock); |
244 | mutex_unlock(&as->lock); |
245 | interrupts_restore(ipl); |
245 | interrupts_restore(ipl); |
246 | return ENOTSUP; |
246 | return ENOTSUP; |
247 | } |
247 | } |
248 | if (area->sh_info) { |
248 | if (area->sh_info) { |
249 | /* |
249 | /* |
250 | * Remapping of shared address space areas |
250 | * Remapping of shared address space areas |
251 | * is not supported. |
251 | * is not supported. |
252 | */ |
252 | */ |
253 | mutex_unlock(&area->lock); |
253 | mutex_unlock(&area->lock); |
254 | mutex_unlock(&as->lock); |
254 | mutex_unlock(&as->lock); |
255 | interrupts_restore(ipl); |
255 | interrupts_restore(ipl); |
256 | return ENOTSUP; |
256 | return ENOTSUP; |
257 | } |
257 | } |
258 | 258 | ||
259 | pages = SIZE2FRAMES((address - area->base) + size); |
259 | pages = SIZE2FRAMES((address - area->base) + size); |
260 | if (!pages) { |
260 | if (!pages) { |
261 | /* |
261 | /* |
262 | * Zero size address space areas are not allowed. |
262 | * Zero size address space areas are not allowed. |
263 | */ |
263 | */ |
264 | mutex_unlock(&area->lock); |
264 | mutex_unlock(&area->lock); |
265 | mutex_unlock(&as->lock); |
265 | mutex_unlock(&as->lock); |
266 | interrupts_restore(ipl); |
266 | interrupts_restore(ipl); |
267 | return EPERM; |
267 | return EPERM; |
268 | } |
268 | } |
269 | 269 | ||
270 | if (pages < area->pages) { |
270 | if (pages < area->pages) { |
271 | bool cond; |
271 | bool cond; |
272 | __address start_free = area->base + pages*PAGE_SIZE; |
272 | __address start_free = area->base + pages*PAGE_SIZE; |
273 | 273 | ||
274 | /* |
274 | /* |
275 | * Shrinking the area. |
275 | * Shrinking the area. |
276 | * No need to check for overlaps. |
276 | * No need to check for overlaps. |
277 | */ |
277 | */ |
278 | 278 | ||
279 | /* |
279 | /* |
280 | * Remove frames belonging to used space starting from |
280 | * Remove frames belonging to used space starting from |
281 | * the highest addresses downwards until an overlap with |
281 | * the highest addresses downwards until an overlap with |
282 | * the resized address space area is found. Note that this |
282 | * the resized address space area is found. Note that this |
283 | * is also the right way to remove part of the used_space |
283 | * is also the right way to remove part of the used_space |
284 | * B+tree leaf list. |
284 | * B+tree leaf list. |
285 | */ |
285 | */ |
286 | for (cond = true; cond;) { |
286 | for (cond = true; cond;) { |
287 | btree_node_t *node; |
287 | btree_node_t *node; |
288 | 288 | ||
289 | ASSERT(!list_empty(&area->used_space.leaf_head)); |
289 | ASSERT(!list_empty(&area->used_space.leaf_head)); |
290 | node = list_get_instance(area->used_space.leaf_head.prev, btree_node_t, leaf_link); |
290 | node = list_get_instance(area->used_space.leaf_head.prev, btree_node_t, leaf_link); |
291 | if ((cond = (bool) node->keys)) { |
291 | if ((cond = (bool) node->keys)) { |
292 | __address b = node->key[node->keys - 1]; |
292 | __address b = node->key[node->keys - 1]; |
293 | count_t c = (count_t) node->value[node->keys - 1]; |
293 | count_t c = (count_t) node->value[node->keys - 1]; |
294 | int i = 0; |
294 | int i = 0; |
295 | 295 | ||
296 | if (overlaps(b, c*PAGE_SIZE, area->base, pages*PAGE_SIZE)) { |
296 | if (overlaps(b, c*PAGE_SIZE, area->base, pages*PAGE_SIZE)) { |
297 | 297 | ||
298 | if (b + c*PAGE_SIZE <= start_free) { |
298 | if (b + c*PAGE_SIZE <= start_free) { |
299 | /* |
299 | /* |
300 | * The whole interval fits completely |
300 | * The whole interval fits completely |
301 | * in the resized address space area. |
301 | * in the resized address space area. |
302 | */ |
302 | */ |
303 | break; |
303 | break; |
304 | } |
304 | } |
305 | 305 | ||
306 | /* |
306 | /* |
307 | * Part of the interval corresponding to b and c |
307 | * Part of the interval corresponding to b and c |
308 | * overlaps with the resized address space area. |
308 | * overlaps with the resized address space area. |
309 | */ |
309 | */ |
310 | 310 | ||
311 | cond = false; /* we are almost done */ |
311 | cond = false; /* we are almost done */ |
312 | i = (start_free - b) >> PAGE_WIDTH; |
312 | i = (start_free - b) >> PAGE_WIDTH; |
313 | if (!used_space_remove(area, start_free, c - i)) |
313 | if (!used_space_remove(area, start_free, c - i)) |
314 | panic("Could not remove used space."); |
314 | panic("Could not remove used space."); |
315 | } else { |
315 | } else { |
316 | /* |
316 | /* |
317 | * The interval of used space can be completely removed. |
317 | * The interval of used space can be completely removed. |
318 | */ |
318 | */ |
319 | if (!used_space_remove(area, b, c)) |
319 | if (!used_space_remove(area, b, c)) |
320 | panic("Could not remove used space.\n"); |
320 | panic("Could not remove used space.\n"); |
321 | } |
321 | } |
322 | 322 | ||
323 | for (; i < c; i++) { |
323 | for (; i < c; i++) { |
324 | pte_t *pte; |
324 | pte_t *pte; |
325 | 325 | ||
326 | page_table_lock(as, false); |
326 | page_table_lock(as, false); |
327 | pte = page_mapping_find(as, b + i*PAGE_SIZE); |
327 | pte = page_mapping_find(as, b + i*PAGE_SIZE); |
328 | ASSERT(pte && PTE_VALID(pte) && PTE_PRESENT(pte)); |
328 | ASSERT(pte && PTE_VALID(pte) && PTE_PRESENT(pte)); |
329 | if (area->backend && area->backend->backend_frame_free) { |
329 | if (area->backend && area->backend->backend_frame_free) { |
330 | area->backend->backend_frame_free(area, |
330 | area->backend->backend_frame_free(area, |
331 | b + i*PAGE_SIZE, PTE_GET_FRAME(pte)); |
331 | b + i*PAGE_SIZE, PTE_GET_FRAME(pte)); |
332 | } |
332 | } |
333 | page_mapping_remove(as, b + i*PAGE_SIZE); |
333 | page_mapping_remove(as, b + i*PAGE_SIZE); |
334 | page_table_unlock(as, false); |
334 | page_table_unlock(as, false); |
335 | } |
335 | } |
336 | } |
336 | } |
337 | } |
337 | } |
338 | /* |
338 | /* |
339 | * Invalidate TLB's. |
339 | * Invalidate TLB's. |
340 | */ |
340 | */ |
341 | tlb_shootdown_start(TLB_INVL_PAGES, AS->asid, area->base + pages*PAGE_SIZE, area->pages - pages); |
341 | tlb_shootdown_start(TLB_INVL_PAGES, AS->asid, area->base + pages*PAGE_SIZE, area->pages - pages); |
342 | tlb_invalidate_pages(AS->asid, area->base + pages*PAGE_SIZE, area->pages - pages); |
342 | tlb_invalidate_pages(AS->asid, area->base + pages*PAGE_SIZE, area->pages - pages); |
343 | tlb_shootdown_finalize(); |
343 | tlb_shootdown_finalize(); |
344 | } else { |
344 | } else { |
345 | /* |
345 | /* |
346 | * Growing the area. |
346 | * Growing the area. |
347 | * Check for overlaps with other address space areas. |
347 | * Check for overlaps with other address space areas. |
348 | */ |
348 | */ |
349 | if (!check_area_conflicts(as, address, pages * PAGE_SIZE, area)) { |
349 | if (!check_area_conflicts(as, address, pages * PAGE_SIZE, area)) { |
350 | mutex_unlock(&area->lock); |
350 | mutex_unlock(&area->lock); |
351 | mutex_unlock(&as->lock); |
351 | mutex_unlock(&as->lock); |
352 | interrupts_restore(ipl); |
352 | interrupts_restore(ipl); |
353 | return EADDRNOTAVAIL; |
353 | return EADDRNOTAVAIL; |
354 | } |
354 | } |
355 | } |
355 | } |
356 | 356 | ||
357 | area->pages = pages; |
357 | area->pages = pages; |
358 | 358 | ||
359 | mutex_unlock(&area->lock); |
359 | mutex_unlock(&area->lock); |
360 | mutex_unlock(&as->lock); |
360 | mutex_unlock(&as->lock); |
361 | interrupts_restore(ipl); |
361 | interrupts_restore(ipl); |
362 | 362 | ||
363 | return 0; |
363 | return 0; |
364 | } |
364 | } |
365 | 365 | ||
366 | /** Destroy address space area. |
366 | /** Destroy address space area. |
367 | * |
367 | * |
368 | * @param as Address space. |
368 | * @param as Address space. |
369 | * @param address Address withing the area to be deleted. |
369 | * @param address Address withing the area to be deleted. |
370 | * |
370 | * |
371 | * @return Zero on success or a value from @ref errno.h on failure. |
371 | * @return Zero on success or a value from @ref errno.h on failure. |
372 | */ |
372 | */ |
373 | int as_area_destroy(as_t *as, __address address) |
373 | int as_area_destroy(as_t *as, __address address) |
374 | { |
374 | { |
375 | as_area_t *area; |
375 | as_area_t *area; |
376 | __address base; |
376 | __address base; |
377 | ipl_t ipl; |
377 | ipl_t ipl; |
378 | bool cond; |
378 | bool cond; |
379 | 379 | ||
380 | ipl = interrupts_disable(); |
380 | ipl = interrupts_disable(); |
381 | mutex_lock(&as->lock); |
381 | mutex_lock(&as->lock); |
382 | 382 | ||
383 | area = find_area_and_lock(as, address); |
383 | area = find_area_and_lock(as, address); |
384 | if (!area) { |
384 | if (!area) { |
385 | mutex_unlock(&as->lock); |
385 | mutex_unlock(&as->lock); |
386 | interrupts_restore(ipl); |
386 | interrupts_restore(ipl); |
387 | return ENOENT; |
387 | return ENOENT; |
388 | } |
388 | } |
389 | 389 | ||
390 | base = area->base; |
390 | base = area->base; |
391 | 391 | ||
392 | /* |
392 | /* |
393 | * Visit only the pages mapped by used_space B+tree. |
393 | * Visit only the pages mapped by used_space B+tree. |
394 | * Note that we must be very careful when walking the tree |
394 | * Note that we must be very careful when walking the tree |
395 | * leaf list and removing used space as the leaf list changes |
395 | * leaf list and removing used space as the leaf list changes |
396 | * unpredictibly after each remove. The solution is to actually |
396 | * unpredictibly after each remove. The solution is to actually |
397 | * not walk the tree at all, but to remove items from the head |
397 | * not walk the tree at all, but to remove items from the head |
398 | * of the leaf list until there are some keys left. |
398 | * of the leaf list until there are some keys left. |
399 | */ |
399 | */ |
400 | for (cond = true; cond;) { |
400 | for (cond = true; cond;) { |
401 | btree_node_t *node; |
401 | btree_node_t *node; |
402 | 402 | ||
403 | ASSERT(!list_empty(&area->used_space.leaf_head)); |
403 | ASSERT(!list_empty(&area->used_space.leaf_head)); |
404 | node = list_get_instance(area->used_space.leaf_head.next, btree_node_t, leaf_link); |
404 | node = list_get_instance(area->used_space.leaf_head.next, btree_node_t, leaf_link); |
405 | if ((cond = (bool) node->keys)) { |
405 | if ((cond = (bool) node->keys)) { |
406 | __address b = node->key[0]; |
406 | __address b = node->key[0]; |
407 | count_t i; |
407 | count_t i; |
408 | pte_t *pte; |
408 | pte_t *pte; |
409 | 409 | ||
410 | for (i = 0; i < (count_t) node->value[0]; i++) { |
410 | for (i = 0; i < (count_t) node->value[0]; i++) { |
411 | page_table_lock(as, false); |
411 | page_table_lock(as, false); |
412 | pte = page_mapping_find(as, b + i*PAGE_SIZE); |
412 | pte = page_mapping_find(as, b + i*PAGE_SIZE); |
413 | ASSERT(pte && PTE_VALID(pte) && PTE_PRESENT(pte)); |
413 | ASSERT(pte && PTE_VALID(pte) && PTE_PRESENT(pte)); |
414 | if (area->backend && area->backend->backend_frame_free) { |
414 | if (area->backend && area->backend->backend_frame_free) { |
415 | area->backend->backend_frame_free(area, |
415 | area->backend->backend_frame_free(area, |
416 | b + i*PAGE_SIZE, PTE_GET_FRAME(pte)); |
416 | b + i*PAGE_SIZE, PTE_GET_FRAME(pte)); |
417 | } |
417 | } |
418 | page_mapping_remove(as, b + i*PAGE_SIZE); |
418 | page_mapping_remove(as, b + i*PAGE_SIZE); |
419 | page_table_unlock(as, false); |
419 | page_table_unlock(as, false); |
420 | } |
420 | } |
421 | if (!used_space_remove(area, b, i)) |
421 | if (!used_space_remove(area, b, i)) |
422 | panic("Could not remove used space.\n"); |
422 | panic("Could not remove used space.\n"); |
423 | } |
423 | } |
424 | } |
424 | } |
425 | btree_destroy(&area->used_space); |
425 | btree_destroy(&area->used_space); |
426 | 426 | ||
427 | /* |
427 | /* |
428 | * Invalidate TLB's. |
428 | * Invalidate TLB's. |
429 | */ |
429 | */ |
430 | tlb_shootdown_start(TLB_INVL_PAGES, AS->asid, area->base, area->pages); |
430 | tlb_shootdown_start(TLB_INVL_PAGES, AS->asid, area->base, area->pages); |
431 | tlb_invalidate_pages(AS->asid, area->base, area->pages); |
431 | tlb_invalidate_pages(AS->asid, area->base, area->pages); |
432 | tlb_shootdown_finalize(); |
432 | tlb_shootdown_finalize(); |
433 | 433 | ||
434 | area->attributes |= AS_AREA_ATTR_PARTIAL; |
434 | area->attributes |= AS_AREA_ATTR_PARTIAL; |
435 | 435 | ||
436 | if (area->sh_info) |
436 | if (area->sh_info) |
437 | sh_info_remove_reference(area->sh_info); |
437 | sh_info_remove_reference(area->sh_info); |
438 | 438 | ||
439 | mutex_unlock(&area->lock); |
439 | mutex_unlock(&area->lock); |
440 | 440 | ||
441 | /* |
441 | /* |
442 | * Remove the empty area from address space. |
442 | * Remove the empty area from address space. |
443 | */ |
443 | */ |
444 | btree_remove(&AS->as_area_btree, base, NULL); |
444 | btree_remove(&AS->as_area_btree, base, NULL); |
445 | 445 | ||
446 | free(area); |
446 | free(area); |
447 | 447 | ||
448 | mutex_unlock(&AS->lock); |
448 | mutex_unlock(&AS->lock); |
449 | interrupts_restore(ipl); |
449 | interrupts_restore(ipl); |
450 | return 0; |
450 | return 0; |
451 | } |
451 | } |
452 | 452 | ||
453 | /** Steal address space area from another task. |
453 | /** Share address space area with another or the same address space. |
454 | * |
454 | * |
455 | * Address space area is stolen from another task |
455 | * Address space area of anonymous memory is shared with a new address |
456 | * Moreover, any existing mapping |
456 | * space area. If the source address space area has not been shared so |
457 | * is copied as well, providing thus a mechanism |
457 | * far, a new sh_info is created and the original mapping is duplicated |
458 | * for sharing group of pages. The source address |
458 | * in its pagemap B+tree. The new address space are simply gets the |
459 | * space area and any associated mapping is preserved. |
459 | * sh_info of the source area. |
460 | * |
460 | * |
461 | * @param src_task Pointer of source task |
461 | * @param src_as Pointer to source address space |
462 | * @param src_base Base address of the source address space area. |
462 | * @param src_base Base address of the source address space area. |
463 | * @param acc_size Expected size of the source area |
463 | * @param acc_size Expected size of the source area |
464 | * @param dst_base Target base address |
464 | * @param dst_base Target base address |
465 | * |
465 | * |
466 | * @return Zero on success or ENOENT if there is no such task or |
466 | * @return Zero on success or ENOENT if there is no such task or |
467 | * if there is no such address space area, |
467 | * if there is no such address space area, |
468 | * EPERM if there was a problem in accepting the area or |
468 | * EPERM if there was a problem in accepting the area or |
469 | * ENOMEM if there was a problem in allocating destination |
469 | * ENOMEM if there was a problem in allocating destination |
470 | * address space area. |
470 | * address space area. ENOTSUP is returned if an attempt |
- | 471 | * to share non-anonymous address space area is detected. |
|
471 | */ |
472 | */ |
472 | int as_area_steal(task_t *src_task, __address src_base, size_t acc_size, |
473 | int as_area_share(as_t *src_as, __address src_base, size_t acc_size, |
473 | __address dst_base) |
474 | __address dst_base) |
474 | { |
475 | { |
475 | ipl_t ipl; |
476 | ipl_t ipl; |
476 | count_t i; |
- | |
477 | as_t *src_as; |
- | |
478 | int src_flags; |
477 | int src_flags; |
479 | size_t src_size; |
478 | size_t src_size; |
480 | as_area_t *src_area, *dst_area; |
479 | as_area_t *src_area, *dst_area; |
- | 480 | share_info_t *sh_info; |
|
- | 481 | link_t *cur; |
|
481 | 482 | ||
482 | ipl = interrupts_disable(); |
483 | ipl = interrupts_disable(); |
483 | spinlock_lock(&src_task->lock); |
- | |
484 | src_as = src_task->as; |
- | |
485 | - | ||
486 | mutex_lock(&src_as->lock); |
484 | mutex_lock(&src_as->lock); |
487 | src_area = find_area_and_lock(src_as, src_base); |
485 | src_area = find_area_and_lock(src_as, src_base); |
488 | if (!src_area) { |
486 | if (!src_area) { |
489 | /* |
487 | /* |
490 | * Could not find the source address space area. |
488 | * Could not find the source address space area. |
491 | */ |
489 | */ |
492 | spinlock_unlock(&src_task->lock); |
- | |
493 | mutex_unlock(&src_as->lock); |
490 | mutex_unlock(&src_as->lock); |
494 | interrupts_restore(ipl); |
491 | interrupts_restore(ipl); |
495 | return ENOENT; |
492 | return ENOENT; |
496 | } |
493 | } |
- | 494 | ||
- | 495 | if (!src_area->backend || src_area->backend != &anon_backend) { |
|
- | 496 | /* |
|
- | 497 | * As of now, only anonymous address space areas can be shared. |
|
- | 498 | */ |
|
- | 499 | mutex_unlock(&src_area->lock); |
|
- | 500 | mutex_unlock(&src_as->lock); |
|
- | 501 | interrupts_restore(ipl); |
|
- | 502 | return ENOTSUP; |
|
- | 503 | } |
|
- | 504 | ||
497 | src_size = src_area->pages * PAGE_SIZE; |
505 | src_size = src_area->pages * PAGE_SIZE; |
498 | src_flags = src_area->flags; |
506 | src_flags = src_area->flags; |
499 | mutex_unlock(&src_area->lock); |
- | |
500 | mutex_unlock(&src_as->lock); |
- | |
501 | 507 | ||
502 | if (src_size != acc_size) { |
508 | if (src_size != acc_size) { |
- | 509 | mutex_unlock(&src_area->lock); |
|
503 | spinlock_unlock(&src_task->lock); |
510 | mutex_unlock(&src_as->lock); |
504 | interrupts_restore(ipl); |
511 | interrupts_restore(ipl); |
505 | return EPERM; |
512 | return EPERM; |
506 | } |
513 | } |
- | 514 | ||
- | 515 | /* |
|
- | 516 | * Now we are committed to sharing the area. |
|
- | 517 | * First prepare the area for sharing. |
|
- | 518 | * Then it will be safe to unlock it. |
|
- | 519 | */ |
|
- | 520 | sh_info = src_area->sh_info; |
|
- | 521 | if (!sh_info) { |
|
- | 522 | sh_info = (share_info_t *) malloc(sizeof(share_info_t), 0); |
|
- | 523 | mutex_initialize(&sh_info->lock); |
|
- | 524 | sh_info->refcount = 2; |
|
- | 525 | btree_create(&sh_info->pagemap); |
|
- | 526 | src_area->sh_info = sh_info; |
|
- | 527 | } else { |
|
- | 528 | mutex_lock(&sh_info->lock); |
|
- | 529 | sh_info->refcount++; |
|
- | 530 | mutex_unlock(&sh_info->lock); |
|
- | 531 | } |
|
- | 532 | ||
- | 533 | /* |
|
- | 534 | * Copy used portions of the area to sh_info's page map. |
|
- | 535 | */ |
|
- | 536 | mutex_lock(&sh_info->lock); |
|
- | 537 | for (cur = src_area->used_space.leaf_head.next; cur != &src_area->used_space.leaf_head; cur = cur->next) { |
|
- | 538 | btree_node_t *node; |
|
- | 539 | int i; |
|
- | 540 | ||
- | 541 | node = list_get_instance(cur, btree_node_t, leaf_link); |
|
- | 542 | for (i = 0; i < node->keys; i++) { |
|
- | 543 | __address base = node->key[i]; |
|
- | 544 | count_t count = (count_t) node->value[i]; |
|
- | 545 | int j; |
|
- | 546 | ||
- | 547 | for (j = 0; j < count; j++) { |
|
- | 548 | pte_t *pte; |
|
- | 549 | ||
- | 550 | page_table_lock(src_as, false); |
|
- | 551 | pte = page_mapping_find(src_as, base + j*PAGE_SIZE); |
|
- | 552 | ASSERT(pte && PTE_VALID(pte) && PTE_PRESENT(pte)); |
|
- | 553 | btree_insert(&sh_info->pagemap, (base + j*PAGE_SIZE) - src_area->base, |
|
- | 554 | (void *) PTE_GET_FRAME(pte), NULL); |
|
- | 555 | page_table_unlock(src_as, false); |
|
- | 556 | } |
|
- | 557 | ||
- | 558 | } |
|
- | 559 | } |
|
- | 560 | mutex_unlock(&sh_info->lock); |
|
- | 561 | ||
- | 562 | mutex_unlock(&src_area->lock); |
|
- | 563 | mutex_unlock(&src_as->lock); |
|
- | 564 | ||
507 | /* |
565 | /* |
508 | * Create copy of the source address space area. |
566 | * Create copy of the source address space area. |
509 | * The destination area is created with AS_AREA_ATTR_PARTIAL |
567 | * The destination area is created with AS_AREA_ATTR_PARTIAL |
510 | * attribute set which prevents race condition with |
568 | * attribute set which prevents race condition with |
511 | * preliminary as_page_fault() calls. |
569 | * preliminary as_page_fault() calls. |
512 | */ |
570 | */ |
513 | dst_area = as_area_create(AS, src_flags, src_size, dst_base, AS_AREA_ATTR_PARTIAL, &anon_backend, NULL); |
571 | dst_area = as_area_create(AS, src_flags, src_size, dst_base, AS_AREA_ATTR_PARTIAL, &anon_backend, NULL); |
514 | if (!dst_area) { |
572 | if (!dst_area) { |
515 | /* |
573 | /* |
516 | * Destination address space area could not be created. |
574 | * Destination address space area could not be created. |
517 | */ |
575 | */ |
518 | spinlock_unlock(&src_task->lock); |
576 | sh_info_remove_reference(sh_info); |
- | 577 | ||
519 | interrupts_restore(ipl); |
578 | interrupts_restore(ipl); |
520 | return ENOMEM; |
579 | return ENOMEM; |
521 | } |
580 | } |
522 | 581 | ||
523 | spinlock_unlock(&src_task->lock); |
- | |
524 | - | ||
525 | /* |
- | |
526 | * Avoid deadlock by first locking the address space with lower address. |
- | |
527 | */ |
- | |
528 | if (AS < src_as) { |
- | |
529 | mutex_lock(&AS->lock); |
- | |
530 | mutex_lock(&src_as->lock); |
- | |
531 | } else { |
- | |
532 | mutex_lock(&AS->lock); |
- | |
533 | mutex_lock(&src_as->lock); |
- | |
534 | } |
- | |
535 | - | ||
536 | for (i = 0; i < SIZE2FRAMES(src_size); i++) { |
- | |
537 | pte_t *pte; |
- | |
538 | __address frame; |
- | |
539 | - | ||
540 | page_table_lock(src_as, false); |
- | |
541 | pte = page_mapping_find(src_as, src_base + i*PAGE_SIZE); |
- | |
542 | if (pte && PTE_VALID(pte)) { |
- | |
543 | ASSERT(PTE_PRESENT(pte)); |
- | |
544 | frame = PTE_GET_FRAME(pte); |
- | |
545 | if (!(src_flags & AS_AREA_DEVICE)) |
- | |
546 | frame_reference_add(ADDR2PFN(frame)); |
- | |
547 | page_table_unlock(src_as, false); |
- | |
548 | } else { |
- | |
549 | page_table_unlock(src_as, false); |
- | |
550 | continue; |
- | |
551 | } |
- | |
552 | - | ||
553 | page_table_lock(AS, false); |
- | |
554 | page_mapping_insert(AS, dst_base + i*PAGE_SIZE, frame, area_flags_to_page_flags(src_flags)); |
- | |
555 | page_table_unlock(AS, false); |
- | |
556 | } |
- | |
557 | - | ||
558 | /* |
582 | /* |
559 | * Now the destination address space area has been |
583 | * Now the destination address space area has been |
560 | * fully initialized. Clear the AS_AREA_ATTR_PARTIAL |
584 | * fully initialized. Clear the AS_AREA_ATTR_PARTIAL |
561 | * attribute. |
585 | * attribute and set the sh_info. |
562 | */ |
586 | */ |
563 | mutex_lock(&dst_area->lock); |
587 | mutex_lock(&dst_area->lock); |
564 | dst_area->attributes &= ~AS_AREA_ATTR_PARTIAL; |
588 | dst_area->attributes &= ~AS_AREA_ATTR_PARTIAL; |
- | 589 | dst_area->sh_info = sh_info; |
|
565 | mutex_unlock(&dst_area->lock); |
590 | mutex_unlock(&dst_area->lock); |
566 | 591 | ||
567 | mutex_unlock(&AS->lock); |
- | |
568 | mutex_unlock(&src_as->lock); |
- | |
569 | interrupts_restore(ipl); |
592 | interrupts_restore(ipl); |
570 | 593 | ||
571 | return 0; |
594 | return 0; |
572 | } |
595 | } |
573 | 596 | ||
574 | /** Initialize mapping for one page of address space. |
597 | /** Initialize mapping for one page of address space. |
575 | * |
598 | * |
576 | * This functions maps 'page' to 'frame' according |
599 | * This functions maps 'page' to 'frame' according |
577 | * to attributes of the address space area to |
600 | * to attributes of the address space area to |
578 | * wich 'page' belongs. |
601 | * wich 'page' belongs. |
579 | * |
602 | * |
580 | * @param as Target address space. |
603 | * @param as Target address space. |
581 | * @param page Virtual page within the area. |
604 | * @param page Virtual page within the area. |
582 | * @param frame Physical frame to which page will be mapped. |
605 | * @param frame Physical frame to which page will be mapped. |
583 | */ |
606 | */ |
584 | void as_set_mapping(as_t *as, __address page, __address frame) |
607 | void as_set_mapping(as_t *as, __address page, __address frame) |
585 | { |
608 | { |
586 | as_area_t *area; |
609 | as_area_t *area; |
587 | ipl_t ipl; |
610 | ipl_t ipl; |
588 | 611 | ||
589 | ipl = interrupts_disable(); |
612 | ipl = interrupts_disable(); |
590 | page_table_lock(as, true); |
613 | page_table_lock(as, true); |
591 | 614 | ||
592 | area = find_area_and_lock(as, page); |
615 | area = find_area_and_lock(as, page); |
593 | if (!area) { |
616 | if (!area) { |
594 | panic("Page not part of any as_area.\n"); |
617 | panic("Page not part of any as_area.\n"); |
595 | } |
618 | } |
596 | 619 | ||
597 | ASSERT(!area->backend); |
620 | ASSERT(!area->backend); |
598 | 621 | ||
599 | page_mapping_insert(as, page, frame, as_area_get_flags(area)); |
622 | page_mapping_insert(as, page, frame, as_area_get_flags(area)); |
600 | if (!used_space_insert(area, page, 1)) |
623 | if (!used_space_insert(area, page, 1)) |
601 | panic("Could not insert used space.\n"); |
624 | panic("Could not insert used space.\n"); |
602 | 625 | ||
603 | mutex_unlock(&area->lock); |
626 | mutex_unlock(&area->lock); |
604 | page_table_unlock(as, true); |
627 | page_table_unlock(as, true); |
605 | interrupts_restore(ipl); |
628 | interrupts_restore(ipl); |
606 | } |
629 | } |
607 | 630 | ||
608 | /** Handle page fault within the current address space. |
631 | /** Handle page fault within the current address space. |
609 | * |
632 | * |
610 | * This is the high-level page fault handler. It decides |
633 | * This is the high-level page fault handler. It decides |
611 | * whether the page fault can be resolved by any backend |
634 | * whether the page fault can be resolved by any backend |
612 | * and if so, it invokes the backend to resolve the page |
635 | * and if so, it invokes the backend to resolve the page |
613 | * fault. |
636 | * fault. |
614 | * |
637 | * |
615 | * Interrupts are assumed disabled. |
638 | * Interrupts are assumed disabled. |
616 | * |
639 | * |
617 | * @param page Faulting page. |
640 | * @param page Faulting page. |
618 | * @param access Access mode that caused the fault (i.e. read/write/exec). |
641 | * @param access Access mode that caused the fault (i.e. read/write/exec). |
619 | * @param istate Pointer to interrupted state. |
642 | * @param istate Pointer to interrupted state. |
620 | * |
643 | * |
621 | * @return AS_PF_FAULT on page fault, AS_PF_OK on success or AS_PF_DEFER if the |
644 | * @return AS_PF_FAULT on page fault, AS_PF_OK on success or AS_PF_DEFER if the |
622 | * fault was caused by copy_to_uspace() or copy_from_uspace(). |
645 | * fault was caused by copy_to_uspace() or copy_from_uspace(). |
623 | */ |
646 | */ |
624 | int as_page_fault(__address page, pf_access_t access, istate_t *istate) |
647 | int as_page_fault(__address page, pf_access_t access, istate_t *istate) |
625 | { |
648 | { |
626 | pte_t *pte; |
649 | pte_t *pte; |
627 | as_area_t *area; |
650 | as_area_t *area; |
628 | 651 | ||
629 | if (!THREAD) |
652 | if (!THREAD) |
630 | return AS_PF_FAULT; |
653 | return AS_PF_FAULT; |
631 | 654 | ||
632 | ASSERT(AS); |
655 | ASSERT(AS); |
633 | 656 | ||
634 | mutex_lock(&AS->lock); |
657 | mutex_lock(&AS->lock); |
635 | area = find_area_and_lock(AS, page); |
658 | area = find_area_and_lock(AS, page); |
636 | if (!area) { |
659 | if (!area) { |
637 | /* |
660 | /* |
638 | * No area contained mapping for 'page'. |
661 | * No area contained mapping for 'page'. |
639 | * Signal page fault to low-level handler. |
662 | * Signal page fault to low-level handler. |
640 | */ |
663 | */ |
641 | mutex_unlock(&AS->lock); |
664 | mutex_unlock(&AS->lock); |
642 | goto page_fault; |
665 | goto page_fault; |
643 | } |
666 | } |
644 | 667 | ||
645 | if (area->attributes & AS_AREA_ATTR_PARTIAL) { |
668 | if (area->attributes & AS_AREA_ATTR_PARTIAL) { |
646 | /* |
669 | /* |
647 | * The address space area is not fully initialized. |
670 | * The address space area is not fully initialized. |
648 | * Avoid possible race by returning error. |
671 | * Avoid possible race by returning error. |
649 | */ |
672 | */ |
650 | mutex_unlock(&area->lock); |
673 | mutex_unlock(&area->lock); |
651 | mutex_unlock(&AS->lock); |
674 | mutex_unlock(&AS->lock); |
652 | goto page_fault; |
675 | goto page_fault; |
653 | } |
676 | } |
654 | 677 | ||
655 | if (!area->backend || !area->backend->backend_page_fault) { |
678 | if (!area->backend || !area->backend->backend_page_fault) { |
656 | /* |
679 | /* |
657 | * The address space area is not backed by any backend |
680 | * The address space area is not backed by any backend |
658 | * or the backend cannot handle page faults. |
681 | * or the backend cannot handle page faults. |
659 | */ |
682 | */ |
660 | mutex_unlock(&area->lock); |
683 | mutex_unlock(&area->lock); |
661 | mutex_unlock(&AS->lock); |
684 | mutex_unlock(&AS->lock); |
662 | goto page_fault; |
685 | goto page_fault; |
663 | } |
686 | } |
664 | 687 | ||
665 | page_table_lock(AS, false); |
688 | page_table_lock(AS, false); |
666 | 689 | ||
667 | /* |
690 | /* |
668 | * To avoid race condition between two page faults |
691 | * To avoid race condition between two page faults |
669 | * on the same address, we need to make sure |
692 | * on the same address, we need to make sure |
670 | * the mapping has not been already inserted. |
693 | * the mapping has not been already inserted. |
671 | */ |
694 | */ |
672 | if ((pte = page_mapping_find(AS, page))) { |
695 | if ((pte = page_mapping_find(AS, page))) { |
673 | if (PTE_PRESENT(pte)) { |
696 | if (PTE_PRESENT(pte)) { |
674 | page_table_unlock(AS, false); |
697 | page_table_unlock(AS, false); |
675 | mutex_unlock(&area->lock); |
698 | mutex_unlock(&area->lock); |
676 | mutex_unlock(&AS->lock); |
699 | mutex_unlock(&AS->lock); |
677 | return AS_PF_OK; |
700 | return AS_PF_OK; |
678 | } |
701 | } |
679 | } |
702 | } |
680 | 703 | ||
681 | /* |
704 | /* |
682 | * Resort to the backend page fault handler. |
705 | * Resort to the backend page fault handler. |
683 | */ |
706 | */ |
684 | if (area->backend->backend_page_fault(area, page, access) != AS_PF_OK) { |
707 | if (area->backend->backend_page_fault(area, page, access) != AS_PF_OK) { |
685 | page_table_unlock(AS, false); |
708 | page_table_unlock(AS, false); |
686 | mutex_unlock(&area->lock); |
709 | mutex_unlock(&area->lock); |
687 | mutex_unlock(&AS->lock); |
710 | mutex_unlock(&AS->lock); |
688 | goto page_fault; |
711 | goto page_fault; |
689 | } |
712 | } |
690 | 713 | ||
691 | page_table_unlock(AS, false); |
714 | page_table_unlock(AS, false); |
692 | mutex_unlock(&area->lock); |
715 | mutex_unlock(&area->lock); |
693 | mutex_unlock(&AS->lock); |
716 | mutex_unlock(&AS->lock); |
694 | return AS_PF_OK; |
717 | return AS_PF_OK; |
695 | 718 | ||
696 | page_fault: |
719 | page_fault: |
697 | if (THREAD->in_copy_from_uspace) { |
720 | if (THREAD->in_copy_from_uspace) { |
698 | THREAD->in_copy_from_uspace = false; |
721 | THREAD->in_copy_from_uspace = false; |
699 | istate_set_retaddr(istate, (__address) &memcpy_from_uspace_failover_address); |
722 | istate_set_retaddr(istate, (__address) &memcpy_from_uspace_failover_address); |
700 | } else if (THREAD->in_copy_to_uspace) { |
723 | } else if (THREAD->in_copy_to_uspace) { |
701 | THREAD->in_copy_to_uspace = false; |
724 | THREAD->in_copy_to_uspace = false; |
702 | istate_set_retaddr(istate, (__address) &memcpy_to_uspace_failover_address); |
725 | istate_set_retaddr(istate, (__address) &memcpy_to_uspace_failover_address); |
703 | } else { |
726 | } else { |
704 | return AS_PF_FAULT; |
727 | return AS_PF_FAULT; |
705 | } |
728 | } |
706 | 729 | ||
707 | return AS_PF_DEFER; |
730 | return AS_PF_DEFER; |
708 | } |
731 | } |
709 | 732 | ||
710 | /** Switch address spaces. |
733 | /** Switch address spaces. |
711 | * |
734 | * |
712 | * Note that this function cannot sleep as it is essentially a part of |
735 | * Note that this function cannot sleep as it is essentially a part of |
713 | * the scheduling. Sleeping here would lead to deadlock on wakeup. |
736 | * the scheduling. Sleeping here would lead to deadlock on wakeup. |
714 | * |
737 | * |
715 | * @param old Old address space or NULL. |
738 | * @param old Old address space or NULL. |
716 | * @param new New address space. |
739 | * @param new New address space. |
717 | */ |
740 | */ |
718 | void as_switch(as_t *old, as_t *new) |
741 | void as_switch(as_t *old, as_t *new) |
719 | { |
742 | { |
720 | ipl_t ipl; |
743 | ipl_t ipl; |
721 | bool needs_asid = false; |
744 | bool needs_asid = false; |
722 | 745 | ||
723 | ipl = interrupts_disable(); |
746 | ipl = interrupts_disable(); |
724 | spinlock_lock(&as_lock); |
747 | spinlock_lock(&as_lock); |
725 | 748 | ||
726 | /* |
749 | /* |
727 | * First, take care of the old address space. |
750 | * First, take care of the old address space. |
728 | */ |
751 | */ |
729 | if (old) { |
752 | if (old) { |
730 | mutex_lock_active(&old->lock); |
753 | mutex_lock_active(&old->lock); |
731 | ASSERT(old->refcount); |
754 | ASSERT(old->refcount); |
732 | if((--old->refcount == 0) && (old != AS_KERNEL)) { |
755 | if((--old->refcount == 0) && (old != AS_KERNEL)) { |
733 | /* |
756 | /* |
734 | * The old address space is no longer active on |
757 | * The old address space is no longer active on |
735 | * any processor. It can be appended to the |
758 | * any processor. It can be appended to the |
736 | * list of inactive address spaces with assigned |
759 | * list of inactive address spaces with assigned |
737 | * ASID. |
760 | * ASID. |
738 | */ |
761 | */ |
739 | ASSERT(old->asid != ASID_INVALID); |
762 | ASSERT(old->asid != ASID_INVALID); |
740 | list_append(&old->inactive_as_with_asid_link, &inactive_as_with_asid_head); |
763 | list_append(&old->inactive_as_with_asid_link, &inactive_as_with_asid_head); |
741 | } |
764 | } |
742 | mutex_unlock(&old->lock); |
765 | mutex_unlock(&old->lock); |
743 | } |
766 | } |
744 | 767 | ||
745 | /* |
768 | /* |
746 | * Second, prepare the new address space. |
769 | * Second, prepare the new address space. |
747 | */ |
770 | */ |
748 | mutex_lock_active(&new->lock); |
771 | mutex_lock_active(&new->lock); |
749 | if ((new->refcount++ == 0) && (new != AS_KERNEL)) { |
772 | if ((new->refcount++ == 0) && (new != AS_KERNEL)) { |
750 | if (new->asid != ASID_INVALID) |
773 | if (new->asid != ASID_INVALID) |
751 | list_remove(&new->inactive_as_with_asid_link); |
774 | list_remove(&new->inactive_as_with_asid_link); |
752 | else |
775 | else |
753 | needs_asid = true; /* defer call to asid_get() until new->lock is released */ |
776 | needs_asid = true; /* defer call to asid_get() until new->lock is released */ |
754 | } |
777 | } |
755 | SET_PTL0_ADDRESS(new->page_table); |
778 | SET_PTL0_ADDRESS(new->page_table); |
756 | mutex_unlock(&new->lock); |
779 | mutex_unlock(&new->lock); |
757 | 780 | ||
758 | if (needs_asid) { |
781 | if (needs_asid) { |
759 | /* |
782 | /* |
760 | * Allocation of new ASID was deferred |
783 | * Allocation of new ASID was deferred |
761 | * until now in order to avoid deadlock. |
784 | * until now in order to avoid deadlock. |
762 | */ |
785 | */ |
763 | asid_t asid; |
786 | asid_t asid; |
764 | 787 | ||
765 | asid = asid_get(); |
788 | asid = asid_get(); |
766 | mutex_lock_active(&new->lock); |
789 | mutex_lock_active(&new->lock); |
767 | new->asid = asid; |
790 | new->asid = asid; |
768 | mutex_unlock(&new->lock); |
791 | mutex_unlock(&new->lock); |
769 | } |
792 | } |
770 | spinlock_unlock(&as_lock); |
793 | spinlock_unlock(&as_lock); |
771 | interrupts_restore(ipl); |
794 | interrupts_restore(ipl); |
772 | 795 | ||
773 | /* |
796 | /* |
774 | * Perform architecture-specific steps. |
797 | * Perform architecture-specific steps. |
775 | * (e.g. write ASID to hardware register etc.) |
798 | * (e.g. write ASID to hardware register etc.) |
776 | */ |
799 | */ |
777 | as_install_arch(new); |
800 | as_install_arch(new); |
778 | 801 | ||
779 | AS = new; |
802 | AS = new; |
780 | } |
803 | } |
781 | 804 | ||
782 | /** Convert address space area flags to page flags. |
805 | /** Convert address space area flags to page flags. |
783 | * |
806 | * |
784 | * @param aflags Flags of some address space area. |
807 | * @param aflags Flags of some address space area. |
785 | * |
808 | * |
786 | * @return Flags to be passed to page_mapping_insert(). |
809 | * @return Flags to be passed to page_mapping_insert(). |
787 | */ |
810 | */ |
788 | int area_flags_to_page_flags(int aflags) |
811 | int area_flags_to_page_flags(int aflags) |
789 | { |
812 | { |
790 | int flags; |
813 | int flags; |
791 | 814 | ||
792 | flags = PAGE_USER | PAGE_PRESENT; |
815 | flags = PAGE_USER | PAGE_PRESENT; |
793 | 816 | ||
794 | if (aflags & AS_AREA_READ) |
817 | if (aflags & AS_AREA_READ) |
795 | flags |= PAGE_READ; |
818 | flags |= PAGE_READ; |
796 | 819 | ||
797 | if (aflags & AS_AREA_WRITE) |
820 | if (aflags & AS_AREA_WRITE) |
798 | flags |= PAGE_WRITE; |
821 | flags |= PAGE_WRITE; |
799 | 822 | ||
800 | if (aflags & AS_AREA_EXEC) |
823 | if (aflags & AS_AREA_EXEC) |
801 | flags |= PAGE_EXEC; |
824 | flags |= PAGE_EXEC; |
802 | 825 | ||
803 | if (!(aflags & AS_AREA_DEVICE)) |
826 | if (!(aflags & AS_AREA_DEVICE)) |
804 | flags |= PAGE_CACHEABLE; |
827 | flags |= PAGE_CACHEABLE; |
805 | 828 | ||
806 | return flags; |
829 | return flags; |
807 | } |
830 | } |
808 | 831 | ||
809 | /** Compute flags for virtual address translation subsytem. |
832 | /** Compute flags for virtual address translation subsytem. |
810 | * |
833 | * |
811 | * The address space area must be locked. |
834 | * The address space area must be locked. |
812 | * Interrupts must be disabled. |
835 | * Interrupts must be disabled. |
813 | * |
836 | * |
814 | * @param a Address space area. |
837 | * @param a Address space area. |
815 | * |
838 | * |
816 | * @return Flags to be used in page_mapping_insert(). |
839 | * @return Flags to be used in page_mapping_insert(). |
817 | */ |
840 | */ |
818 | int as_area_get_flags(as_area_t *a) |
841 | int as_area_get_flags(as_area_t *a) |
819 | { |
842 | { |
820 | return area_flags_to_page_flags(a->flags); |
843 | return area_flags_to_page_flags(a->flags); |
821 | } |
844 | } |
822 | 845 | ||
823 | /** Create page table. |
846 | /** Create page table. |
824 | * |
847 | * |
825 | * Depending on architecture, create either address space |
848 | * Depending on architecture, create either address space |
826 | * private or global page table. |
849 | * private or global page table. |
827 | * |
850 | * |
828 | * @param flags Flags saying whether the page table is for kernel address space. |
851 | * @param flags Flags saying whether the page table is for kernel address space. |
829 | * |
852 | * |
830 | * @return First entry of the page table. |
853 | * @return First entry of the page table. |
831 | */ |
854 | */ |
832 | pte_t *page_table_create(int flags) |
855 | pte_t *page_table_create(int flags) |
833 | { |
856 | { |
834 | ASSERT(as_operations); |
857 | ASSERT(as_operations); |
835 | ASSERT(as_operations->page_table_create); |
858 | ASSERT(as_operations->page_table_create); |
836 | 859 | ||
837 | return as_operations->page_table_create(flags); |
860 | return as_operations->page_table_create(flags); |
838 | } |
861 | } |
839 | 862 | ||
840 | /** Lock page table. |
863 | /** Lock page table. |
841 | * |
864 | * |
842 | * This function should be called before any page_mapping_insert(), |
865 | * This function should be called before any page_mapping_insert(), |
843 | * page_mapping_remove() and page_mapping_find(). |
866 | * page_mapping_remove() and page_mapping_find(). |
844 | * |
867 | * |
845 | * Locking order is such that address space areas must be locked |
868 | * Locking order is such that address space areas must be locked |
846 | * prior to this call. Address space can be locked prior to this |
869 | * prior to this call. Address space can be locked prior to this |
847 | * call in which case the lock argument is false. |
870 | * call in which case the lock argument is false. |
848 | * |
871 | * |
849 | * @param as Address space. |
872 | * @param as Address space. |
850 | * @param lock If false, do not attempt to lock as->lock. |
873 | * @param lock If false, do not attempt to lock as->lock. |
851 | */ |
874 | */ |
852 | void page_table_lock(as_t *as, bool lock) |
875 | void page_table_lock(as_t *as, bool lock) |
853 | { |
876 | { |
854 | ASSERT(as_operations); |
877 | ASSERT(as_operations); |
855 | ASSERT(as_operations->page_table_lock); |
878 | ASSERT(as_operations->page_table_lock); |
856 | 879 | ||
857 | as_operations->page_table_lock(as, lock); |
880 | as_operations->page_table_lock(as, lock); |
858 | } |
881 | } |
859 | 882 | ||
860 | /** Unlock page table. |
883 | /** Unlock page table. |
861 | * |
884 | * |
862 | * @param as Address space. |
885 | * @param as Address space. |
863 | * @param unlock If false, do not attempt to unlock as->lock. |
886 | * @param unlock If false, do not attempt to unlock as->lock. |
864 | */ |
887 | */ |
865 | void page_table_unlock(as_t *as, bool unlock) |
888 | void page_table_unlock(as_t *as, bool unlock) |
866 | { |
889 | { |
867 | ASSERT(as_operations); |
890 | ASSERT(as_operations); |
868 | ASSERT(as_operations->page_table_unlock); |
891 | ASSERT(as_operations->page_table_unlock); |
869 | 892 | ||
870 | as_operations->page_table_unlock(as, unlock); |
893 | as_operations->page_table_unlock(as, unlock); |
871 | } |
894 | } |
872 | 895 | ||
873 | 896 | ||
874 | /** Find address space area and lock it. |
897 | /** Find address space area and lock it. |
875 | * |
898 | * |
876 | * The address space must be locked and interrupts must be disabled. |
899 | * The address space must be locked and interrupts must be disabled. |
877 | * |
900 | * |
878 | * @param as Address space. |
901 | * @param as Address space. |
879 | * @param va Virtual address. |
902 | * @param va Virtual address. |
880 | * |
903 | * |
881 | * @return Locked address space area containing va on success or NULL on failure. |
904 | * @return Locked address space area containing va on success or NULL on failure. |
882 | */ |
905 | */ |
883 | as_area_t *find_area_and_lock(as_t *as, __address va) |
906 | as_area_t *find_area_and_lock(as_t *as, __address va) |
884 | { |
907 | { |
885 | as_area_t *a; |
908 | as_area_t *a; |
886 | btree_node_t *leaf, *lnode; |
909 | btree_node_t *leaf, *lnode; |
887 | int i; |
910 | int i; |
888 | 911 | ||
889 | a = (as_area_t *) btree_search(&as->as_area_btree, va, &leaf); |
912 | a = (as_area_t *) btree_search(&as->as_area_btree, va, &leaf); |
890 | if (a) { |
913 | if (a) { |
891 | /* va is the base address of an address space area */ |
914 | /* va is the base address of an address space area */ |
892 | mutex_lock(&a->lock); |
915 | mutex_lock(&a->lock); |
893 | return a; |
916 | return a; |
894 | } |
917 | } |
895 | 918 | ||
896 | /* |
919 | /* |
897 | * Search the leaf node and the righmost record of its left neighbour |
920 | * Search the leaf node and the righmost record of its left neighbour |
898 | * to find out whether this is a miss or va belongs to an address |
921 | * to find out whether this is a miss or va belongs to an address |
899 | * space area found there. |
922 | * space area found there. |
900 | */ |
923 | */ |
901 | 924 | ||
902 | /* First, search the leaf node itself. */ |
925 | /* First, search the leaf node itself. */ |
903 | for (i = 0; i < leaf->keys; i++) { |
926 | for (i = 0; i < leaf->keys; i++) { |
904 | a = (as_area_t *) leaf->value[i]; |
927 | a = (as_area_t *) leaf->value[i]; |
905 | mutex_lock(&a->lock); |
928 | mutex_lock(&a->lock); |
906 | if ((a->base <= va) && (va < a->base + a->pages * PAGE_SIZE)) { |
929 | if ((a->base <= va) && (va < a->base + a->pages * PAGE_SIZE)) { |
907 | return a; |
930 | return a; |
908 | } |
931 | } |
909 | mutex_unlock(&a->lock); |
932 | mutex_unlock(&a->lock); |
910 | } |
933 | } |
911 | 934 | ||
912 | /* |
935 | /* |
913 | * Second, locate the left neighbour and test its last record. |
936 | * Second, locate the left neighbour and test its last record. |
914 | * Because of its position in the B+tree, it must have base < va. |
937 | * Because of its position in the B+tree, it must have base < va. |
915 | */ |
938 | */ |
916 | if ((lnode = btree_leaf_node_left_neighbour(&as->as_area_btree, leaf))) { |
939 | if ((lnode = btree_leaf_node_left_neighbour(&as->as_area_btree, leaf))) { |
917 | a = (as_area_t *) lnode->value[lnode->keys - 1]; |
940 | a = (as_area_t *) lnode->value[lnode->keys - 1]; |
918 | mutex_lock(&a->lock); |
941 | mutex_lock(&a->lock); |
919 | if (va < a->base + a->pages * PAGE_SIZE) { |
942 | if (va < a->base + a->pages * PAGE_SIZE) { |
920 | return a; |
943 | return a; |
921 | } |
944 | } |
922 | mutex_unlock(&a->lock); |
945 | mutex_unlock(&a->lock); |
923 | } |
946 | } |
924 | 947 | ||
925 | return NULL; |
948 | return NULL; |
926 | } |
949 | } |
927 | 950 | ||
928 | /** Check area conflicts with other areas. |
951 | /** Check area conflicts with other areas. |
929 | * |
952 | * |
930 | * The address space must be locked and interrupts must be disabled. |
953 | * The address space must be locked and interrupts must be disabled. |
931 | * |
954 | * |
932 | * @param as Address space. |
955 | * @param as Address space. |
933 | * @param va Starting virtual address of the area being tested. |
956 | * @param va Starting virtual address of the area being tested. |
934 | * @param size Size of the area being tested. |
957 | * @param size Size of the area being tested. |
935 | * @param avoid_area Do not touch this area. |
958 | * @param avoid_area Do not touch this area. |
936 | * |
959 | * |
937 | * @return True if there is no conflict, false otherwise. |
960 | * @return True if there is no conflict, false otherwise. |
938 | */ |
961 | */ |
939 | bool check_area_conflicts(as_t *as, __address va, size_t size, as_area_t *avoid_area) |
962 | bool check_area_conflicts(as_t *as, __address va, size_t size, as_area_t *avoid_area) |
940 | { |
963 | { |
941 | as_area_t *a; |
964 | as_area_t *a; |
942 | btree_node_t *leaf, *node; |
965 | btree_node_t *leaf, *node; |
943 | int i; |
966 | int i; |
944 | 967 | ||
945 | /* |
968 | /* |
946 | * We don't want any area to have conflicts with NULL page. |
969 | * We don't want any area to have conflicts with NULL page. |
947 | */ |
970 | */ |
948 | if (overlaps(va, size, NULL, PAGE_SIZE)) |
971 | if (overlaps(va, size, NULL, PAGE_SIZE)) |
949 | return false; |
972 | return false; |
950 | 973 | ||
951 | /* |
974 | /* |
952 | * The leaf node is found in O(log n), where n is proportional to |
975 | * The leaf node is found in O(log n), where n is proportional to |
953 | * the number of address space areas belonging to as. |
976 | * the number of address space areas belonging to as. |
954 | * The check for conflicts is then attempted on the rightmost |
977 | * The check for conflicts is then attempted on the rightmost |
955 | * record in the left neighbour, the leftmost record in the right |
978 | * record in the left neighbour, the leftmost record in the right |
956 | * neighbour and all records in the leaf node itself. |
979 | * neighbour and all records in the leaf node itself. |
957 | */ |
980 | */ |
958 | 981 | ||
959 | if ((a = (as_area_t *) btree_search(&as->as_area_btree, va, &leaf))) { |
982 | if ((a = (as_area_t *) btree_search(&as->as_area_btree, va, &leaf))) { |
960 | if (a != avoid_area) |
983 | if (a != avoid_area) |
961 | return false; |
984 | return false; |
962 | } |
985 | } |
963 | 986 | ||
964 | /* First, check the two border cases. */ |
987 | /* First, check the two border cases. */ |
965 | if ((node = btree_leaf_node_left_neighbour(&as->as_area_btree, leaf))) { |
988 | if ((node = btree_leaf_node_left_neighbour(&as->as_area_btree, leaf))) { |
966 | a = (as_area_t *) node->value[node->keys - 1]; |
989 | a = (as_area_t *) node->value[node->keys - 1]; |
967 | mutex_lock(&a->lock); |
990 | mutex_lock(&a->lock); |
968 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
991 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
969 | mutex_unlock(&a->lock); |
992 | mutex_unlock(&a->lock); |
970 | return false; |
993 | return false; |
971 | } |
994 | } |
972 | mutex_unlock(&a->lock); |
995 | mutex_unlock(&a->lock); |
973 | } |
996 | } |
974 | if ((node = btree_leaf_node_right_neighbour(&as->as_area_btree, leaf))) { |
997 | if ((node = btree_leaf_node_right_neighbour(&as->as_area_btree, leaf))) { |
975 | a = (as_area_t *) node->value[0]; |
998 | a = (as_area_t *) node->value[0]; |
976 | mutex_lock(&a->lock); |
999 | mutex_lock(&a->lock); |
977 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1000 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
978 | mutex_unlock(&a->lock); |
1001 | mutex_unlock(&a->lock); |
979 | return false; |
1002 | return false; |
980 | } |
1003 | } |
981 | mutex_unlock(&a->lock); |
1004 | mutex_unlock(&a->lock); |
982 | } |
1005 | } |
983 | 1006 | ||
984 | /* Second, check the leaf node. */ |
1007 | /* Second, check the leaf node. */ |
985 | for (i = 0; i < leaf->keys; i++) { |
1008 | for (i = 0; i < leaf->keys; i++) { |
986 | a = (as_area_t *) leaf->value[i]; |
1009 | a = (as_area_t *) leaf->value[i]; |
987 | 1010 | ||
988 | if (a == avoid_area) |
1011 | if (a == avoid_area) |
989 | continue; |
1012 | continue; |
990 | 1013 | ||
991 | mutex_lock(&a->lock); |
1014 | mutex_lock(&a->lock); |
992 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1015 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
993 | mutex_unlock(&a->lock); |
1016 | mutex_unlock(&a->lock); |
994 | return false; |
1017 | return false; |
995 | } |
1018 | } |
996 | mutex_unlock(&a->lock); |
1019 | mutex_unlock(&a->lock); |
997 | } |
1020 | } |
998 | 1021 | ||
999 | /* |
1022 | /* |
1000 | * So far, the area does not conflict with other areas. |
1023 | * So far, the area does not conflict with other areas. |
1001 | * Check if it doesn't conflict with kernel address space. |
1024 | * Check if it doesn't conflict with kernel address space. |
1002 | */ |
1025 | */ |
1003 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
1026 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
1004 | return !overlaps(va, size, |
1027 | return !overlaps(va, size, |
1005 | KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START); |
1028 | KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START); |
1006 | } |
1029 | } |
1007 | 1030 | ||
1008 | return true; |
1031 | return true; |
1009 | } |
1032 | } |
1010 | 1033 | ||
1011 | /** Return size of the address space area with given base. */ |
1034 | /** Return size of the address space area with given base. */ |
1012 | size_t as_get_size(__address base) |
1035 | size_t as_get_size(__address base) |
1013 | { |
1036 | { |
1014 | ipl_t ipl; |
1037 | ipl_t ipl; |
1015 | as_area_t *src_area; |
1038 | as_area_t *src_area; |
1016 | size_t size; |
1039 | size_t size; |
1017 | 1040 | ||
1018 | ipl = interrupts_disable(); |
1041 | ipl = interrupts_disable(); |
1019 | src_area = find_area_and_lock(AS, base); |
1042 | src_area = find_area_and_lock(AS, base); |
1020 | if (src_area){ |
1043 | if (src_area){ |
1021 | size = src_area->pages * PAGE_SIZE; |
1044 | size = src_area->pages * PAGE_SIZE; |
1022 | mutex_unlock(&src_area->lock); |
1045 | mutex_unlock(&src_area->lock); |
1023 | } else { |
1046 | } else { |
1024 | size = 0; |
1047 | size = 0; |
1025 | } |
1048 | } |
1026 | interrupts_restore(ipl); |
1049 | interrupts_restore(ipl); |
1027 | return size; |
1050 | return size; |
1028 | } |
1051 | } |
1029 | 1052 | ||
1030 | /** Mark portion of address space area as used. |
1053 | /** Mark portion of address space area as used. |
1031 | * |
1054 | * |
1032 | * The address space area must be already locked. |
1055 | * The address space area must be already locked. |
1033 | * |
1056 | * |
1034 | * @param a Address space area. |
1057 | * @param a Address space area. |
1035 | * @param page First page to be marked. |
1058 | * @param page First page to be marked. |
1036 | * @param count Number of page to be marked. |
1059 | * @param count Number of page to be marked. |
1037 | * |
1060 | * |
1038 | * @return 0 on failure and 1 on success. |
1061 | * @return 0 on failure and 1 on success. |
1039 | */ |
1062 | */ |
1040 | int used_space_insert(as_area_t *a, __address page, count_t count) |
1063 | int used_space_insert(as_area_t *a, __address page, count_t count) |
1041 | { |
1064 | { |
1042 | btree_node_t *leaf, *node; |
1065 | btree_node_t *leaf, *node; |
1043 | count_t pages; |
1066 | count_t pages; |
1044 | int i; |
1067 | int i; |
1045 | 1068 | ||
1046 | ASSERT(page == ALIGN_DOWN(page, PAGE_SIZE)); |
1069 | ASSERT(page == ALIGN_DOWN(page, PAGE_SIZE)); |
1047 | ASSERT(count); |
1070 | ASSERT(count); |
1048 | 1071 | ||
1049 | pages = (count_t) btree_search(&a->used_space, page, &leaf); |
1072 | pages = (count_t) btree_search(&a->used_space, page, &leaf); |
1050 | if (pages) { |
1073 | if (pages) { |
1051 | /* |
1074 | /* |
1052 | * We hit the beginning of some used space. |
1075 | * We hit the beginning of some used space. |
1053 | */ |
1076 | */ |
1054 | return 0; |
1077 | return 0; |
1055 | } |
1078 | } |
1056 | 1079 | ||
1057 | node = btree_leaf_node_left_neighbour(&a->used_space, leaf); |
1080 | node = btree_leaf_node_left_neighbour(&a->used_space, leaf); |
1058 | if (node) { |
1081 | if (node) { |
1059 | __address left_pg = node->key[node->keys - 1], right_pg = leaf->key[0]; |
1082 | __address left_pg = node->key[node->keys - 1], right_pg = leaf->key[0]; |
1060 | count_t left_cnt = (count_t) node->value[node->keys - 1], right_cnt = (count_t) leaf->value[0]; |
1083 | count_t left_cnt = (count_t) node->value[node->keys - 1], right_cnt = (count_t) leaf->value[0]; |
1061 | 1084 | ||
1062 | /* |
1085 | /* |
1063 | * Examine the possibility that the interval fits |
1086 | * Examine the possibility that the interval fits |
1064 | * somewhere between the rightmost interval of |
1087 | * somewhere between the rightmost interval of |
1065 | * the left neigbour and the first interval of the leaf. |
1088 | * the left neigbour and the first interval of the leaf. |
1066 | */ |
1089 | */ |
1067 | 1090 | ||
1068 | if (page >= right_pg) { |
1091 | if (page >= right_pg) { |
1069 | /* Do nothing. */ |
1092 | /* Do nothing. */ |
1070 | } else if (overlaps(page, count*PAGE_SIZE, left_pg, left_cnt*PAGE_SIZE)) { |
1093 | } else if (overlaps(page, count*PAGE_SIZE, left_pg, left_cnt*PAGE_SIZE)) { |
1071 | /* The interval intersects with the left interval. */ |
1094 | /* The interval intersects with the left interval. */ |
1072 | return 0; |
1095 | return 0; |
1073 | } else if (overlaps(page, count*PAGE_SIZE, right_pg, right_cnt*PAGE_SIZE)) { |
1096 | } else if (overlaps(page, count*PAGE_SIZE, right_pg, right_cnt*PAGE_SIZE)) { |
1074 | /* The interval intersects with the right interval. */ |
1097 | /* The interval intersects with the right interval. */ |
1075 | return 0; |
1098 | return 0; |
1076 | } else if ((page == left_pg + left_cnt*PAGE_SIZE) && (page + count*PAGE_SIZE == right_pg)) { |
1099 | } else if ((page == left_pg + left_cnt*PAGE_SIZE) && (page + count*PAGE_SIZE == right_pg)) { |
1077 | /* The interval can be added by merging the two already present intervals. */ |
1100 | /* The interval can be added by merging the two already present intervals. */ |
1078 | node->value[node->keys - 1] += count + right_cnt; |
1101 | node->value[node->keys - 1] += count + right_cnt; |
1079 | btree_remove(&a->used_space, right_pg, leaf); |
1102 | btree_remove(&a->used_space, right_pg, leaf); |
1080 | return 1; |
1103 | return 1; |
1081 | } else if (page == left_pg + left_cnt*PAGE_SIZE) { |
1104 | } else if (page == left_pg + left_cnt*PAGE_SIZE) { |
1082 | /* The interval can be added by simply growing the left interval. */ |
1105 | /* The interval can be added by simply growing the left interval. */ |
1083 | node->value[node->keys - 1] += count; |
1106 | node->value[node->keys - 1] += count; |
1084 | return 1; |
1107 | return 1; |
1085 | } else if (page + count*PAGE_SIZE == right_pg) { |
1108 | } else if (page + count*PAGE_SIZE == right_pg) { |
1086 | /* |
1109 | /* |
1087 | * The interval can be addded by simply moving base of the right |
1110 | * The interval can be addded by simply moving base of the right |
1088 | * interval down and increasing its size accordingly. |
1111 | * interval down and increasing its size accordingly. |
1089 | */ |
1112 | */ |
1090 | leaf->value[0] += count; |
1113 | leaf->value[0] += count; |
1091 | leaf->key[0] = page; |
1114 | leaf->key[0] = page; |
1092 | return 1; |
1115 | return 1; |
1093 | } else { |
1116 | } else { |
1094 | /* |
1117 | /* |
1095 | * The interval is between both neigbouring intervals, |
1118 | * The interval is between both neigbouring intervals, |
1096 | * but cannot be merged with any of them. |
1119 | * but cannot be merged with any of them. |
1097 | */ |
1120 | */ |
1098 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1121 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1099 | return 1; |
1122 | return 1; |
1100 | } |
1123 | } |
1101 | } else if (page < leaf->key[0]) { |
1124 | } else if (page < leaf->key[0]) { |
1102 | __address right_pg = leaf->key[0]; |
1125 | __address right_pg = leaf->key[0]; |
1103 | count_t right_cnt = (count_t) leaf->value[0]; |
1126 | count_t right_cnt = (count_t) leaf->value[0]; |
1104 | 1127 | ||
1105 | /* |
1128 | /* |
1106 | * Investigate the border case in which the left neighbour does not |
1129 | * Investigate the border case in which the left neighbour does not |
1107 | * exist but the interval fits from the left. |
1130 | * exist but the interval fits from the left. |
1108 | */ |
1131 | */ |
1109 | 1132 | ||
1110 | if (overlaps(page, count*PAGE_SIZE, right_pg, right_cnt*PAGE_SIZE)) { |
1133 | if (overlaps(page, count*PAGE_SIZE, right_pg, right_cnt*PAGE_SIZE)) { |
1111 | /* The interval intersects with the right interval. */ |
1134 | /* The interval intersects with the right interval. */ |
1112 | return 0; |
1135 | return 0; |
1113 | } else if (page + count*PAGE_SIZE == right_pg) { |
1136 | } else if (page + count*PAGE_SIZE == right_pg) { |
1114 | /* |
1137 | /* |
1115 | * The interval can be added by moving the base of the right interval down |
1138 | * The interval can be added by moving the base of the right interval down |
1116 | * and increasing its size accordingly. |
1139 | * and increasing its size accordingly. |
1117 | */ |
1140 | */ |
1118 | leaf->key[0] = page; |
1141 | leaf->key[0] = page; |
1119 | leaf->value[0] += count; |
1142 | leaf->value[0] += count; |
1120 | return 1; |
1143 | return 1; |
1121 | } else { |
1144 | } else { |
1122 | /* |
1145 | /* |
1123 | * The interval doesn't adjoin with the right interval. |
1146 | * The interval doesn't adjoin with the right interval. |
1124 | * It must be added individually. |
1147 | * It must be added individually. |
1125 | */ |
1148 | */ |
1126 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1149 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1127 | return 1; |
1150 | return 1; |
1128 | } |
1151 | } |
1129 | } |
1152 | } |
1130 | 1153 | ||
1131 | node = btree_leaf_node_right_neighbour(&a->used_space, leaf); |
1154 | node = btree_leaf_node_right_neighbour(&a->used_space, leaf); |
1132 | if (node) { |
1155 | if (node) { |
1133 | __address left_pg = leaf->key[leaf->keys - 1], right_pg = node->key[0]; |
1156 | __address left_pg = leaf->key[leaf->keys - 1], right_pg = node->key[0]; |
1134 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1], right_cnt = (count_t) node->value[0]; |
1157 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1], right_cnt = (count_t) node->value[0]; |
1135 | 1158 | ||
1136 | /* |
1159 | /* |
1137 | * Examine the possibility that the interval fits |
1160 | * Examine the possibility that the interval fits |
1138 | * somewhere between the leftmost interval of |
1161 | * somewhere between the leftmost interval of |
1139 | * the right neigbour and the last interval of the leaf. |
1162 | * the right neigbour and the last interval of the leaf. |
1140 | */ |
1163 | */ |
1141 | 1164 | ||
1142 | if (page < left_pg) { |
1165 | if (page < left_pg) { |
1143 | /* Do nothing. */ |
1166 | /* Do nothing. */ |
1144 | } else if (overlaps(page, count*PAGE_SIZE, left_pg, left_cnt*PAGE_SIZE)) { |
1167 | } else if (overlaps(page, count*PAGE_SIZE, left_pg, left_cnt*PAGE_SIZE)) { |
1145 | /* The interval intersects with the left interval. */ |
1168 | /* The interval intersects with the left interval. */ |
1146 | return 0; |
1169 | return 0; |
1147 | } else if (overlaps(page, count*PAGE_SIZE, right_pg, right_cnt*PAGE_SIZE)) { |
1170 | } else if (overlaps(page, count*PAGE_SIZE, right_pg, right_cnt*PAGE_SIZE)) { |
1148 | /* The interval intersects with the right interval. */ |
1171 | /* The interval intersects with the right interval. */ |
1149 | return 0; |
1172 | return 0; |
1150 | } else if ((page == left_pg + left_cnt*PAGE_SIZE) && (page + count*PAGE_SIZE == right_pg)) { |
1173 | } else if ((page == left_pg + left_cnt*PAGE_SIZE) && (page + count*PAGE_SIZE == right_pg)) { |
1151 | /* The interval can be added by merging the two already present intervals. */ |
1174 | /* The interval can be added by merging the two already present intervals. */ |
1152 | leaf->value[leaf->keys - 1] += count + right_cnt; |
1175 | leaf->value[leaf->keys - 1] += count + right_cnt; |
1153 | btree_remove(&a->used_space, right_pg, node); |
1176 | btree_remove(&a->used_space, right_pg, node); |
1154 | return 1; |
1177 | return 1; |
1155 | } else if (page == left_pg + left_cnt*PAGE_SIZE) { |
1178 | } else if (page == left_pg + left_cnt*PAGE_SIZE) { |
1156 | /* The interval can be added by simply growing the left interval. */ |
1179 | /* The interval can be added by simply growing the left interval. */ |
1157 | leaf->value[leaf->keys - 1] += count; |
1180 | leaf->value[leaf->keys - 1] += count; |
1158 | return 1; |
1181 | return 1; |
1159 | } else if (page + count*PAGE_SIZE == right_pg) { |
1182 | } else if (page + count*PAGE_SIZE == right_pg) { |
1160 | /* |
1183 | /* |
1161 | * The interval can be addded by simply moving base of the right |
1184 | * The interval can be addded by simply moving base of the right |
1162 | * interval down and increasing its size accordingly. |
1185 | * interval down and increasing its size accordingly. |
1163 | */ |
1186 | */ |
1164 | node->value[0] += count; |
1187 | node->value[0] += count; |
1165 | node->key[0] = page; |
1188 | node->key[0] = page; |
1166 | return 1; |
1189 | return 1; |
1167 | } else { |
1190 | } else { |
1168 | /* |
1191 | /* |
1169 | * The interval is between both neigbouring intervals, |
1192 | * The interval is between both neigbouring intervals, |
1170 | * but cannot be merged with any of them. |
1193 | * but cannot be merged with any of them. |
1171 | */ |
1194 | */ |
1172 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1195 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1173 | return 1; |
1196 | return 1; |
1174 | } |
1197 | } |
1175 | } else if (page >= leaf->key[leaf->keys - 1]) { |
1198 | } else if (page >= leaf->key[leaf->keys - 1]) { |
1176 | __address left_pg = leaf->key[leaf->keys - 1]; |
1199 | __address left_pg = leaf->key[leaf->keys - 1]; |
1177 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1200 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1178 | 1201 | ||
1179 | /* |
1202 | /* |
1180 | * Investigate the border case in which the right neighbour does not |
1203 | * Investigate the border case in which the right neighbour does not |
1181 | * exist but the interval fits from the right. |
1204 | * exist but the interval fits from the right. |
1182 | */ |
1205 | */ |
1183 | 1206 | ||
1184 | if (overlaps(page, count*PAGE_SIZE, left_pg, left_cnt*PAGE_SIZE)) { |
1207 | if (overlaps(page, count*PAGE_SIZE, left_pg, left_cnt*PAGE_SIZE)) { |
1185 | /* The interval intersects with the left interval. */ |
1208 | /* The interval intersects with the left interval. */ |
1186 | return 0; |
1209 | return 0; |
1187 | } else if (left_pg + left_cnt*PAGE_SIZE == page) { |
1210 | } else if (left_pg + left_cnt*PAGE_SIZE == page) { |
1188 | /* The interval can be added by growing the left interval. */ |
1211 | /* The interval can be added by growing the left interval. */ |
1189 | leaf->value[leaf->keys - 1] += count; |
1212 | leaf->value[leaf->keys - 1] += count; |
1190 | return 1; |
1213 | return 1; |
1191 | } else { |
1214 | } else { |
1192 | /* |
1215 | /* |
1193 | * The interval doesn't adjoin with the left interval. |
1216 | * The interval doesn't adjoin with the left interval. |
1194 | * It must be added individually. |
1217 | * It must be added individually. |
1195 | */ |
1218 | */ |
1196 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1219 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1197 | return 1; |
1220 | return 1; |
1198 | } |
1221 | } |
1199 | } |
1222 | } |
1200 | 1223 | ||
1201 | /* |
1224 | /* |
1202 | * Note that if the algorithm made it thus far, the interval can fit only |
1225 | * Note that if the algorithm made it thus far, the interval can fit only |
1203 | * between two other intervals of the leaf. The two border cases were already |
1226 | * between two other intervals of the leaf. The two border cases were already |
1204 | * resolved. |
1227 | * resolved. |
1205 | */ |
1228 | */ |
1206 | for (i = 1; i < leaf->keys; i++) { |
1229 | for (i = 1; i < leaf->keys; i++) { |
1207 | if (page < leaf->key[i]) { |
1230 | if (page < leaf->key[i]) { |
1208 | __address left_pg = leaf->key[i - 1], right_pg = leaf->key[i]; |
1231 | __address left_pg = leaf->key[i - 1], right_pg = leaf->key[i]; |
1209 | count_t left_cnt = (count_t) leaf->value[i - 1], right_cnt = (count_t) leaf->value[i]; |
1232 | count_t left_cnt = (count_t) leaf->value[i - 1], right_cnt = (count_t) leaf->value[i]; |
1210 | 1233 | ||
1211 | /* |
1234 | /* |
1212 | * The interval fits between left_pg and right_pg. |
1235 | * The interval fits between left_pg and right_pg. |
1213 | */ |
1236 | */ |
1214 | 1237 | ||
1215 | if (overlaps(page, count*PAGE_SIZE, left_pg, left_cnt*PAGE_SIZE)) { |
1238 | if (overlaps(page, count*PAGE_SIZE, left_pg, left_cnt*PAGE_SIZE)) { |
1216 | /* The interval intersects with the left interval. */ |
1239 | /* The interval intersects with the left interval. */ |
1217 | return 0; |
1240 | return 0; |
1218 | } else if (overlaps(page, count*PAGE_SIZE, right_pg, right_cnt*PAGE_SIZE)) { |
1241 | } else if (overlaps(page, count*PAGE_SIZE, right_pg, right_cnt*PAGE_SIZE)) { |
1219 | /* The interval intersects with the right interval. */ |
1242 | /* The interval intersects with the right interval. */ |
1220 | return 0; |
1243 | return 0; |
1221 | } else if ((page == left_pg + left_cnt*PAGE_SIZE) && (page + count*PAGE_SIZE == right_pg)) { |
1244 | } else if ((page == left_pg + left_cnt*PAGE_SIZE) && (page + count*PAGE_SIZE == right_pg)) { |
1222 | /* The interval can be added by merging the two already present intervals. */ |
1245 | /* The interval can be added by merging the two already present intervals. */ |
1223 | leaf->value[i - 1] += count + right_cnt; |
1246 | leaf->value[i - 1] += count + right_cnt; |
1224 | btree_remove(&a->used_space, right_pg, leaf); |
1247 | btree_remove(&a->used_space, right_pg, leaf); |
1225 | return 1; |
1248 | return 1; |
1226 | } else if (page == left_pg + left_cnt*PAGE_SIZE) { |
1249 | } else if (page == left_pg + left_cnt*PAGE_SIZE) { |
1227 | /* The interval can be added by simply growing the left interval. */ |
1250 | /* The interval can be added by simply growing the left interval. */ |
1228 | leaf->value[i - 1] += count; |
1251 | leaf->value[i - 1] += count; |
1229 | return 1; |
1252 | return 1; |
1230 | } else if (page + count*PAGE_SIZE == right_pg) { |
1253 | } else if (page + count*PAGE_SIZE == right_pg) { |
1231 | /* |
1254 | /* |
1232 | * The interval can be addded by simply moving base of the right |
1255 | * The interval can be addded by simply moving base of the right |
1233 | * interval down and increasing its size accordingly. |
1256 | * interval down and increasing its size accordingly. |
1234 | */ |
1257 | */ |
1235 | leaf->value[i] += count; |
1258 | leaf->value[i] += count; |
1236 | leaf->key[i] = page; |
1259 | leaf->key[i] = page; |
1237 | return 1; |
1260 | return 1; |
1238 | } else { |
1261 | } else { |
1239 | /* |
1262 | /* |
1240 | * The interval is between both neigbouring intervals, |
1263 | * The interval is between both neigbouring intervals, |
1241 | * but cannot be merged with any of them. |
1264 | * but cannot be merged with any of them. |
1242 | */ |
1265 | */ |
1243 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1266 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1244 | return 1; |
1267 | return 1; |
1245 | } |
1268 | } |
1246 | } |
1269 | } |
1247 | } |
1270 | } |
1248 | 1271 | ||
1249 | panic("Inconsistency detected while adding %d pages of used space at %P.\n", count, page); |
1272 | panic("Inconsistency detected while adding %d pages of used space at %P.\n", count, page); |
1250 | } |
1273 | } |
1251 | 1274 | ||
1252 | /** Mark portion of address space area as unused. |
1275 | /** Mark portion of address space area as unused. |
1253 | * |
1276 | * |
1254 | * The address space area must be already locked. |
1277 | * The address space area must be already locked. |
1255 | * |
1278 | * |
1256 | * @param a Address space area. |
1279 | * @param a Address space area. |
1257 | * @param page First page to be marked. |
1280 | * @param page First page to be marked. |
1258 | * @param count Number of page to be marked. |
1281 | * @param count Number of page to be marked. |
1259 | * |
1282 | * |
1260 | * @return 0 on failure and 1 on success. |
1283 | * @return 0 on failure and 1 on success. |
1261 | */ |
1284 | */ |
1262 | int used_space_remove(as_area_t *a, __address page, count_t count) |
1285 | int used_space_remove(as_area_t *a, __address page, count_t count) |
1263 | { |
1286 | { |
1264 | btree_node_t *leaf, *node; |
1287 | btree_node_t *leaf, *node; |
1265 | count_t pages; |
1288 | count_t pages; |
1266 | int i; |
1289 | int i; |
1267 | 1290 | ||
1268 | ASSERT(page == ALIGN_DOWN(page, PAGE_SIZE)); |
1291 | ASSERT(page == ALIGN_DOWN(page, PAGE_SIZE)); |
1269 | ASSERT(count); |
1292 | ASSERT(count); |
1270 | 1293 | ||
1271 | pages = (count_t) btree_search(&a->used_space, page, &leaf); |
1294 | pages = (count_t) btree_search(&a->used_space, page, &leaf); |
1272 | if (pages) { |
1295 | if (pages) { |
1273 | /* |
1296 | /* |
1274 | * We are lucky, page is the beginning of some interval. |
1297 | * We are lucky, page is the beginning of some interval. |
1275 | */ |
1298 | */ |
1276 | if (count > pages) { |
1299 | if (count > pages) { |
1277 | return 0; |
1300 | return 0; |
1278 | } else if (count == pages) { |
1301 | } else if (count == pages) { |
1279 | btree_remove(&a->used_space, page, leaf); |
1302 | btree_remove(&a->used_space, page, leaf); |
1280 | return 1; |
1303 | return 1; |
1281 | } else { |
1304 | } else { |
1282 | /* |
1305 | /* |
1283 | * Find the respective interval. |
1306 | * Find the respective interval. |
1284 | * Decrease its size and relocate its start address. |
1307 | * Decrease its size and relocate its start address. |
1285 | */ |
1308 | */ |
1286 | for (i = 0; i < leaf->keys; i++) { |
1309 | for (i = 0; i < leaf->keys; i++) { |
1287 | if (leaf->key[i] == page) { |
1310 | if (leaf->key[i] == page) { |
1288 | leaf->key[i] += count*PAGE_SIZE; |
1311 | leaf->key[i] += count*PAGE_SIZE; |
1289 | leaf->value[i] -= count; |
1312 | leaf->value[i] -= count; |
1290 | return 1; |
1313 | return 1; |
1291 | } |
1314 | } |
1292 | } |
1315 | } |
1293 | goto error; |
1316 | goto error; |
1294 | } |
1317 | } |
1295 | } |
1318 | } |
1296 | 1319 | ||
1297 | node = btree_leaf_node_left_neighbour(&a->used_space, leaf); |
1320 | node = btree_leaf_node_left_neighbour(&a->used_space, leaf); |
1298 | if (node && page < leaf->key[0]) { |
1321 | if (node && page < leaf->key[0]) { |
1299 | __address left_pg = node->key[node->keys - 1]; |
1322 | __address left_pg = node->key[node->keys - 1]; |
1300 | count_t left_cnt = (count_t) node->value[node->keys - 1]; |
1323 | count_t left_cnt = (count_t) node->value[node->keys - 1]; |
1301 | 1324 | ||
1302 | if (overlaps(left_pg, left_cnt*PAGE_SIZE, page, count*PAGE_SIZE)) { |
1325 | if (overlaps(left_pg, left_cnt*PAGE_SIZE, page, count*PAGE_SIZE)) { |
1303 | if (page + count*PAGE_SIZE == left_pg + left_cnt*PAGE_SIZE) { |
1326 | if (page + count*PAGE_SIZE == left_pg + left_cnt*PAGE_SIZE) { |
1304 | /* |
1327 | /* |
1305 | * The interval is contained in the rightmost interval |
1328 | * The interval is contained in the rightmost interval |
1306 | * of the left neighbour and can be removed by |
1329 | * of the left neighbour and can be removed by |
1307 | * updating the size of the bigger interval. |
1330 | * updating the size of the bigger interval. |
1308 | */ |
1331 | */ |
1309 | node->value[node->keys - 1] -= count; |
1332 | node->value[node->keys - 1] -= count; |
1310 | return 1; |
1333 | return 1; |
1311 | } else if (page + count*PAGE_SIZE < left_pg + left_cnt*PAGE_SIZE) { |
1334 | } else if (page + count*PAGE_SIZE < left_pg + left_cnt*PAGE_SIZE) { |
1312 | count_t new_cnt; |
1335 | count_t new_cnt; |
1313 | 1336 | ||
1314 | /* |
1337 | /* |
1315 | * The interval is contained in the rightmost interval |
1338 | * The interval is contained in the rightmost interval |
1316 | * of the left neighbour but its removal requires |
1339 | * of the left neighbour but its removal requires |
1317 | * both updating the size of the original interval and |
1340 | * both updating the size of the original interval and |
1318 | * also inserting a new interval. |
1341 | * also inserting a new interval. |
1319 | */ |
1342 | */ |
1320 | new_cnt = ((left_pg + left_cnt*PAGE_SIZE) - (page + count*PAGE_SIZE)) >> PAGE_WIDTH; |
1343 | new_cnt = ((left_pg + left_cnt*PAGE_SIZE) - (page + count*PAGE_SIZE)) >> PAGE_WIDTH; |
1321 | node->value[node->keys - 1] -= count + new_cnt; |
1344 | node->value[node->keys - 1] -= count + new_cnt; |
1322 | btree_insert(&a->used_space, page + count*PAGE_SIZE, (void *) new_cnt, leaf); |
1345 | btree_insert(&a->used_space, page + count*PAGE_SIZE, (void *) new_cnt, leaf); |
1323 | return 1; |
1346 | return 1; |
1324 | } |
1347 | } |
1325 | } |
1348 | } |
1326 | return 0; |
1349 | return 0; |
1327 | } else if (page < leaf->key[0]) { |
1350 | } else if (page < leaf->key[0]) { |
1328 | return 0; |
1351 | return 0; |
1329 | } |
1352 | } |
1330 | 1353 | ||
1331 | if (page > leaf->key[leaf->keys - 1]) { |
1354 | if (page > leaf->key[leaf->keys - 1]) { |
1332 | __address left_pg = leaf->key[leaf->keys - 1]; |
1355 | __address left_pg = leaf->key[leaf->keys - 1]; |
1333 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1356 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1334 | 1357 | ||
1335 | if (overlaps(left_pg, left_cnt*PAGE_SIZE, page, count*PAGE_SIZE)) { |
1358 | if (overlaps(left_pg, left_cnt*PAGE_SIZE, page, count*PAGE_SIZE)) { |
1336 | if (page + count*PAGE_SIZE == left_pg + left_cnt*PAGE_SIZE) { |
1359 | if (page + count*PAGE_SIZE == left_pg + left_cnt*PAGE_SIZE) { |
1337 | /* |
1360 | /* |
1338 | * The interval is contained in the rightmost interval |
1361 | * The interval is contained in the rightmost interval |
1339 | * of the leaf and can be removed by updating the size |
1362 | * of the leaf and can be removed by updating the size |
1340 | * of the bigger interval. |
1363 | * of the bigger interval. |
1341 | */ |
1364 | */ |
1342 | leaf->value[leaf->keys - 1] -= count; |
1365 | leaf->value[leaf->keys - 1] -= count; |
1343 | return 1; |
1366 | return 1; |
1344 | } else if (page + count*PAGE_SIZE < left_pg + left_cnt*PAGE_SIZE) { |
1367 | } else if (page + count*PAGE_SIZE < left_pg + left_cnt*PAGE_SIZE) { |
1345 | count_t new_cnt; |
1368 | count_t new_cnt; |
1346 | 1369 | ||
1347 | /* |
1370 | /* |
1348 | * The interval is contained in the rightmost interval |
1371 | * The interval is contained in the rightmost interval |
1349 | * of the leaf but its removal requires both updating |
1372 | * of the leaf but its removal requires both updating |
1350 | * the size of the original interval and |
1373 | * the size of the original interval and |
1351 | * also inserting a new interval. |
1374 | * also inserting a new interval. |
1352 | */ |
1375 | */ |
1353 | new_cnt = ((left_pg + left_cnt*PAGE_SIZE) - (page + count*PAGE_SIZE)) >> PAGE_WIDTH; |
1376 | new_cnt = ((left_pg + left_cnt*PAGE_SIZE) - (page + count*PAGE_SIZE)) >> PAGE_WIDTH; |
1354 | leaf->value[leaf->keys - 1] -= count + new_cnt; |
1377 | leaf->value[leaf->keys - 1] -= count + new_cnt; |
1355 | btree_insert(&a->used_space, page + count*PAGE_SIZE, (void *) new_cnt, leaf); |
1378 | btree_insert(&a->used_space, page + count*PAGE_SIZE, (void *) new_cnt, leaf); |
1356 | return 1; |
1379 | return 1; |
1357 | } |
1380 | } |
1358 | } |
1381 | } |
1359 | return 0; |
1382 | return 0; |
1360 | } |
1383 | } |
1361 | 1384 | ||
1362 | /* |
1385 | /* |
1363 | * The border cases have been already resolved. |
1386 | * The border cases have been already resolved. |
1364 | * Now the interval can be only between intervals of the leaf. |
1387 | * Now the interval can be only between intervals of the leaf. |
1365 | */ |
1388 | */ |
1366 | for (i = 1; i < leaf->keys - 1; i++) { |
1389 | for (i = 1; i < leaf->keys - 1; i++) { |
1367 | if (page < leaf->key[i]) { |
1390 | if (page < leaf->key[i]) { |
1368 | __address left_pg = leaf->key[i - 1]; |
1391 | __address left_pg = leaf->key[i - 1]; |
1369 | count_t left_cnt = (count_t) leaf->value[i - 1]; |
1392 | count_t left_cnt = (count_t) leaf->value[i - 1]; |
1370 | 1393 | ||
1371 | /* |
1394 | /* |
1372 | * Now the interval is between intervals corresponding to (i - 1) and i. |
1395 | * Now the interval is between intervals corresponding to (i - 1) and i. |
1373 | */ |
1396 | */ |
1374 | if (overlaps(left_pg, left_cnt*PAGE_SIZE, page, count*PAGE_SIZE)) { |
1397 | if (overlaps(left_pg, left_cnt*PAGE_SIZE, page, count*PAGE_SIZE)) { |
1375 | if (page + count*PAGE_SIZE == left_pg + left_cnt*PAGE_SIZE) { |
1398 | if (page + count*PAGE_SIZE == left_pg + left_cnt*PAGE_SIZE) { |
1376 | /* |
1399 | /* |
1377 | * The interval is contained in the interval (i - 1) |
1400 | * The interval is contained in the interval (i - 1) |
1378 | * of the leaf and can be removed by updating the size |
1401 | * of the leaf and can be removed by updating the size |
1379 | * of the bigger interval. |
1402 | * of the bigger interval. |
1380 | */ |
1403 | */ |
1381 | leaf->value[i - 1] -= count; |
1404 | leaf->value[i - 1] -= count; |
1382 | return 1; |
1405 | return 1; |
1383 | } else if (page + count*PAGE_SIZE < left_pg + left_cnt*PAGE_SIZE) { |
1406 | } else if (page + count*PAGE_SIZE < left_pg + left_cnt*PAGE_SIZE) { |
1384 | count_t new_cnt; |
1407 | count_t new_cnt; |
1385 | 1408 | ||
1386 | /* |
1409 | /* |
1387 | * The interval is contained in the interval (i - 1) |
1410 | * The interval is contained in the interval (i - 1) |
1388 | * of the leaf but its removal requires both updating |
1411 | * of the leaf but its removal requires both updating |
1389 | * the size of the original interval and |
1412 | * the size of the original interval and |
1390 | * also inserting a new interval. |
1413 | * also inserting a new interval. |
1391 | */ |
1414 | */ |
1392 | new_cnt = ((left_pg + left_cnt*PAGE_SIZE) - (page + count*PAGE_SIZE)) >> PAGE_WIDTH; |
1415 | new_cnt = ((left_pg + left_cnt*PAGE_SIZE) - (page + count*PAGE_SIZE)) >> PAGE_WIDTH; |
1393 | leaf->value[i - 1] -= count + new_cnt; |
1416 | leaf->value[i - 1] -= count + new_cnt; |
1394 | btree_insert(&a->used_space, page + count*PAGE_SIZE, (void *) new_cnt, leaf); |
1417 | btree_insert(&a->used_space, page + count*PAGE_SIZE, (void *) new_cnt, leaf); |
1395 | return 1; |
1418 | return 1; |
1396 | } |
1419 | } |
1397 | } |
1420 | } |
1398 | return 0; |
1421 | return 0; |
1399 | } |
1422 | } |
1400 | } |
1423 | } |
1401 | 1424 | ||
1402 | error: |
1425 | error: |
1403 | panic("Inconsistency detected while removing %d pages of used space from %P.\n", count, page); |
1426 | panic("Inconsistency detected while removing %d pages of used space from %P.\n", count, page); |
1404 | } |
1427 | } |
1405 | 1428 | ||
1406 | /** Remove reference to address space area share info. |
1429 | /** Remove reference to address space area share info. |
1407 | * |
1430 | * |
1408 | * If the reference count drops to 0, the sh_info is deallocated. |
1431 | * If the reference count drops to 0, the sh_info is deallocated. |
1409 | * |
1432 | * |
1410 | * @param sh_info Pointer to address space area share info. |
1433 | * @param sh_info Pointer to address space area share info. |
1411 | */ |
1434 | */ |
1412 | void sh_info_remove_reference(share_info_t *sh_info) |
1435 | void sh_info_remove_reference(share_info_t *sh_info) |
1413 | { |
1436 | { |
1414 | bool dealloc = false; |
1437 | bool dealloc = false; |
1415 | 1438 | ||
1416 | mutex_lock(&sh_info->lock); |
1439 | mutex_lock(&sh_info->lock); |
1417 | ASSERT(sh_info->refcount); |
1440 | ASSERT(sh_info->refcount); |
1418 | if (--sh_info->refcount == 0) { |
1441 | if (--sh_info->refcount == 0) { |
1419 | dealloc = true; |
1442 | dealloc = true; |
1420 | bool cond; |
1443 | bool cond; |
1421 | 1444 | ||
1422 | /* |
1445 | /* |
1423 | * Now walk carefully the pagemap B+tree and free/remove |
1446 | * Now walk carefully the pagemap B+tree and free/remove |
1424 | * reference from all frames found there. |
1447 | * reference from all frames found there. |
1425 | */ |
1448 | */ |
1426 | for (cond = true; cond;) { |
1449 | for (cond = true; cond;) { |
1427 | btree_node_t *node; |
1450 | btree_node_t *node; |
1428 | 1451 | ||
1429 | ASSERT(!list_empty(&sh_info->pagemap.leaf_head)); |
1452 | ASSERT(!list_empty(&sh_info->pagemap.leaf_head)); |
1430 | node = list_get_instance(sh_info->pagemap.leaf_head.next, btree_node_t, leaf_link); |
1453 | node = list_get_instance(sh_info->pagemap.leaf_head.next, btree_node_t, leaf_link); |
1431 | if ((cond = node->keys)) { |
1454 | if ((cond = node->keys)) { |
1432 | frame_free(ADDR2PFN((__address) node->value[0])); |
1455 | frame_free(ADDR2PFN((__address) node->value[0])); |
1433 | btree_remove(&sh_info->pagemap, node->key[0], node); |
1456 | btree_remove(&sh_info->pagemap, node->key[0], node); |
1434 | } |
1457 | } |
1435 | } |
1458 | } |
1436 | 1459 | ||
1437 | } |
1460 | } |
1438 | mutex_unlock(&sh_info->lock); |
1461 | mutex_unlock(&sh_info->lock); |
1439 | 1462 | ||
1440 | if (dealloc) { |
1463 | if (dealloc) { |
1441 | btree_destroy(&sh_info->pagemap); |
1464 | btree_destroy(&sh_info->pagemap); |
1442 | free(sh_info); |
1465 | free(sh_info); |
1443 | } |
1466 | } |
1444 | } |
1467 | } |
1445 | 1468 | ||
1446 | static int anon_page_fault(as_area_t *area, __address addr, pf_access_t access); |
1469 | static int anon_page_fault(as_area_t *area, __address addr, pf_access_t access); |
1447 | static void anon_frame_free(as_area_t *area, __address page, __address frame); |
1470 | static void anon_frame_free(as_area_t *area, __address page, __address frame); |
1448 | 1471 | ||
1449 | /* |
1472 | /* |
1450 | * Anonymous memory backend. |
1473 | * Anonymous memory backend. |
1451 | */ |
1474 | */ |
1452 | mem_backend_t anon_backend = { |
1475 | mem_backend_t anon_backend = { |
1453 | .backend_page_fault = anon_page_fault, |
1476 | .backend_page_fault = anon_page_fault, |
1454 | .backend_frame_free = anon_frame_free |
1477 | .backend_frame_free = anon_frame_free |
1455 | }; |
1478 | }; |
1456 | 1479 | ||
1457 | /** Service a page fault in the anonymous memory address space area. |
1480 | /** Service a page fault in the anonymous memory address space area. |
1458 | * |
1481 | * |
1459 | * The address space area and page tables must be already locked. |
1482 | * The address space area and page tables must be already locked. |
1460 | * |
1483 | * |
1461 | * @param area Pointer to the address space area. |
1484 | * @param area Pointer to the address space area. |
1462 | * @param addr Faulting virtual address. |
1485 | * @param addr Faulting virtual address. |
1463 | * @param access Access mode that caused the fault (i.e. read/write/exec). |
1486 | * @param access Access mode that caused the fault (i.e. read/write/exec). |
1464 | * |
1487 | * |
1465 | * @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. serviced). |
1488 | * @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. serviced). |
1466 | */ |
1489 | */ |
1467 | int anon_page_fault(as_area_t *area, __address addr, pf_access_t access) |
1490 | int anon_page_fault(as_area_t *area, __address addr, pf_access_t access) |
1468 | { |
1491 | { |
1469 | __address frame; |
1492 | __address frame; |
1470 | 1493 | ||
1471 | if (area->sh_info) { |
1494 | if (area->sh_info) { |
1472 | btree_node_t *leaf; |
1495 | btree_node_t *leaf; |
1473 | 1496 | ||
1474 | /* |
1497 | /* |
1475 | * The area is shared, chances are that the mapping can be found |
1498 | * The area is shared, chances are that the mapping can be found |
1476 | * in the pagemap of the address space area share info structure. |
1499 | * in the pagemap of the address space area share info structure. |
1477 | * In the case that the pagemap does not contain the respective |
1500 | * In the case that the pagemap does not contain the respective |
1478 | * mapping, a new frame is allocated and the mapping is created. |
1501 | * mapping, a new frame is allocated and the mapping is created. |
1479 | */ |
1502 | */ |
1480 | mutex_lock(&area->sh_info->lock); |
1503 | mutex_lock(&area->sh_info->lock); |
1481 | frame = (__address) btree_search(&area->sh_info->pagemap, ALIGN_DOWN(addr, PAGE_SIZE), &leaf); |
1504 | frame = (__address) btree_search(&area->sh_info->pagemap, |
- | 1505 | ALIGN_DOWN(addr, PAGE_SIZE) - area->base, &leaf); |
|
1482 | if (!frame) { |
1506 | if (!frame) { |
1483 | bool allocate = true; |
1507 | bool allocate = true; |
1484 | int i; |
1508 | int i; |
1485 | 1509 | ||
1486 | /* |
1510 | /* |
1487 | * Zero can be returned as a valid frame address. |
1511 | * Zero can be returned as a valid frame address. |
1488 | * Just a small workaround. |
1512 | * Just a small workaround. |
1489 | */ |
1513 | */ |
1490 | for (i = 0; i < leaf->keys; i++) { |
1514 | for (i = 0; i < leaf->keys; i++) { |
1491 | if (leaf->key[i] == ALIGN_DOWN(addr, PAGE_SIZE)) { |
1515 | if (leaf->key[i] == ALIGN_DOWN(addr, PAGE_SIZE)) { |
1492 | allocate = false; |
1516 | allocate = false; |
1493 | break; |
1517 | break; |
1494 | } |
1518 | } |
1495 | } |
1519 | } |
1496 | if (allocate) { |
1520 | if (allocate) { |
1497 | frame = PFN2ADDR(frame_alloc(ONE_FRAME, 0)); |
1521 | frame = PFN2ADDR(frame_alloc(ONE_FRAME, 0)); |
1498 | memsetb(PA2KA(frame), FRAME_SIZE, 0); |
1522 | memsetb(PA2KA(frame), FRAME_SIZE, 0); |
1499 | 1523 | ||
1500 | /* |
1524 | /* |
1501 | * Insert the address of the newly allocated frame to the pagemap. |
1525 | * Insert the address of the newly allocated frame to the pagemap. |
1502 | */ |
1526 | */ |
1503 | btree_insert(&area->sh_info->pagemap, ALIGN_DOWN(addr, PAGE_SIZE), (void *) frame, leaf); |
1527 | btree_insert(&area->sh_info->pagemap, ALIGN_DOWN(addr, PAGE_SIZE) - area->base, (void *) frame, leaf); |
1504 | } |
1528 | } |
1505 | } |
1529 | } |
1506 | mutex_unlock(&area->sh_info->lock); |
1530 | mutex_unlock(&area->sh_info->lock); |
1507 | } else { |
1531 | } else { |
1508 | 1532 | ||
1509 | /* |
1533 | /* |
1510 | * In general, there can be several reasons that |
1534 | * In general, there can be several reasons that |
1511 | * can have caused this fault. |
1535 | * can have caused this fault. |
1512 | * |
1536 | * |
1513 | * - non-existent mapping: the area is an anonymous |
1537 | * - non-existent mapping: the area is an anonymous |
1514 | * area (e.g. heap or stack) and so far has not been |
1538 | * area (e.g. heap or stack) and so far has not been |
1515 | * allocated a frame for the faulting page |
1539 | * allocated a frame for the faulting page |
1516 | * |
1540 | * |
1517 | * - non-present mapping: another possibility, |
1541 | * - non-present mapping: another possibility, |
1518 | * currently not implemented, would be frame |
1542 | * currently not implemented, would be frame |
1519 | * reuse; when this becomes a possibility, |
1543 | * reuse; when this becomes a possibility, |
1520 | * do not forget to distinguish between |
1544 | * do not forget to distinguish between |
1521 | * the different causes |
1545 | * the different causes |
1522 | */ |
1546 | */ |
1523 | frame = PFN2ADDR(frame_alloc(ONE_FRAME, 0)); |
1547 | frame = PFN2ADDR(frame_alloc(ONE_FRAME, 0)); |
1524 | memsetb(PA2KA(frame), FRAME_SIZE, 0); |
1548 | memsetb(PA2KA(frame), FRAME_SIZE, 0); |
1525 | } |
1549 | } |
1526 | 1550 | ||
1527 | /* |
1551 | /* |
1528 | * Map 'page' to 'frame'. |
1552 | * Map 'page' to 'frame'. |
1529 | * Note that TLB shootdown is not attempted as only new information is being |
1553 | * Note that TLB shootdown is not attempted as only new information is being |
1530 | * inserted into page tables. |
1554 | * inserted into page tables. |
1531 | */ |
1555 | */ |
1532 | page_mapping_insert(AS, addr, frame, as_area_get_flags(area)); |
1556 | page_mapping_insert(AS, addr, frame, as_area_get_flags(area)); |
1533 | if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1)) |
1557 | if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1)) |
1534 | panic("Could not insert used space.\n"); |
1558 | panic("Could not insert used space.\n"); |
1535 | 1559 | ||
1536 | return AS_PF_OK; |
1560 | return AS_PF_OK; |
1537 | } |
1561 | } |
1538 | 1562 | ||
1539 | /** Free a frame that is backed by the anonymous memory backend. |
1563 | /** Free a frame that is backed by the anonymous memory backend. |
1540 | * |
1564 | * |
1541 | * The address space area and page tables must be already locked. |
1565 | * The address space area and page tables must be already locked. |
1542 | * |
1566 | * |
1543 | * @param area Ignored. |
1567 | * @param area Ignored. |
1544 | * @param page Ignored. |
1568 | * @param page Ignored. |
1545 | * @param frame Frame to be released. |
1569 | * @param frame Frame to be released. |
1546 | */ |
1570 | */ |
1547 | void anon_frame_free(as_area_t *area, __address page, __address frame) |
1571 | void anon_frame_free(as_area_t *area, __address page, __address frame) |
1548 | { |
1572 | { |
1549 | frame_free(ADDR2PFN(frame)); |
1573 | frame_free(ADDR2PFN(frame)); |
1550 | } |
1574 | } |
1551 | 1575 | ||
1552 | /* |
1576 | /* |
1553 | * Address space related syscalls. |
1577 | * Address space related syscalls. |
1554 | */ |
1578 | */ |
1555 | 1579 | ||
1556 | /** Wrapper for as_area_create(). */ |
1580 | /** Wrapper for as_area_create(). */ |
1557 | __native sys_as_area_create(__address address, size_t size, int flags) |
1581 | __native sys_as_area_create(__address address, size_t size, int flags) |
1558 | { |
1582 | { |
1559 | if (as_area_create(AS, flags, size, address, AS_AREA_ATTR_NONE, &anon_backend, NULL)) |
1583 | if (as_area_create(AS, flags, size, address, AS_AREA_ATTR_NONE, &anon_backend, NULL)) |
1560 | return (__native) address; |
1584 | return (__native) address; |
1561 | else |
1585 | else |
1562 | return (__native) -1; |
1586 | return (__native) -1; |
1563 | } |
1587 | } |
1564 | 1588 | ||
1565 | /** Wrapper for as_area_resize. */ |
1589 | /** Wrapper for as_area_resize. */ |
1566 | __native sys_as_area_resize(__address address, size_t size, int flags) |
1590 | __native sys_as_area_resize(__address address, size_t size, int flags) |
1567 | { |
1591 | { |
1568 | return (__native) as_area_resize(AS, address, size, 0); |
1592 | return (__native) as_area_resize(AS, address, size, 0); |
1569 | } |
1593 | } |
1570 | 1594 | ||
1571 | /** Wrapper for as_area_destroy. */ |
1595 | /** Wrapper for as_area_destroy. */ |
1572 | __native sys_as_area_destroy(__address address) |
1596 | __native sys_as_area_destroy(__address address) |
1573 | { |
1597 | { |
1574 | return (__native) as_area_destroy(AS, address); |
1598 | return (__native) as_area_destroy(AS, address); |
1575 | } |
1599 | } |
1576 | 1600 |