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1 | /* |
1 | /* |
2 | * Copyright (c) 2001-2006 Jakub Jermar |
2 | * Copyright (c) 2001-2006 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup genericmm |
29 | /** @addtogroup genericmm |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | /** |
33 | /** |
34 | * @file |
34 | * @file |
35 | * @brief Address space related functions. |
35 | * @brief Address space related functions. |
36 | * |
36 | * |
37 | * This file contains address space manipulation functions. |
37 | * This file contains address space manipulation functions. |
38 | * Roughly speaking, this is a higher-level client of |
38 | * Roughly speaking, this is a higher-level client of |
39 | * Virtual Address Translation (VAT) subsystem. |
39 | * Virtual Address Translation (VAT) subsystem. |
40 | * |
40 | * |
41 | * Functionality provided by this file allows one to |
41 | * Functionality provided by this file allows one to |
42 | * create address spaces and create, resize and share |
42 | * create address spaces and create, resize and share |
43 | * address space areas. |
43 | * address space areas. |
44 | * |
44 | * |
45 | * @see page.c |
45 | * @see page.c |
46 | * |
46 | * |
47 | */ |
47 | */ |
48 | 48 | ||
49 | #include <mm/as.h> |
49 | #include <mm/as.h> |
50 | #include <arch/mm/as.h> |
50 | #include <arch/mm/as.h> |
51 | #include <mm/page.h> |
51 | #include <mm/page.h> |
52 | #include <mm/frame.h> |
52 | #include <mm/frame.h> |
53 | #include <mm/slab.h> |
53 | #include <mm/slab.h> |
54 | #include <mm/tlb.h> |
54 | #include <mm/tlb.h> |
55 | #include <arch/mm/page.h> |
55 | #include <arch/mm/page.h> |
56 | #include <genarch/mm/page_pt.h> |
56 | #include <genarch/mm/page_pt.h> |
57 | #include <genarch/mm/page_ht.h> |
57 | #include <genarch/mm/page_ht.h> |
58 | #include <mm/asid.h> |
58 | #include <mm/asid.h> |
59 | #include <arch/mm/asid.h> |
59 | #include <arch/mm/asid.h> |
60 | #include <synch/spinlock.h> |
60 | #include <synch/spinlock.h> |
61 | #include <synch/mutex.h> |
61 | #include <synch/mutex.h> |
62 | #include <adt/list.h> |
62 | #include <adt/list.h> |
63 | #include <adt/btree.h> |
63 | #include <adt/btree.h> |
64 | #include <proc/task.h> |
64 | #include <proc/task.h> |
65 | #include <proc/thread.h> |
65 | #include <proc/thread.h> |
66 | #include <arch/asm.h> |
66 | #include <arch/asm.h> |
67 | #include <panic.h> |
67 | #include <panic.h> |
68 | #include <debug.h> |
68 | #include <debug.h> |
69 | #include <print.h> |
69 | #include <print.h> |
70 | #include <memstr.h> |
70 | #include <memstr.h> |
71 | #include <macros.h> |
71 | #include <macros.h> |
72 | #include <arch.h> |
72 | #include <arch.h> |
73 | #include <errno.h> |
73 | #include <errno.h> |
74 | #include <config.h> |
74 | #include <config.h> |
75 | #include <align.h> |
75 | #include <align.h> |
76 | #include <arch/types.h> |
76 | #include <arch/types.h> |
77 | #include <syscall/copy.h> |
77 | #include <syscall/copy.h> |
78 | #include <arch/interrupt.h> |
78 | #include <arch/interrupt.h> |
79 | 79 | ||
80 | #ifdef CONFIG_VIRT_IDX_DCACHE |
80 | #ifdef CONFIG_VIRT_IDX_DCACHE |
81 | #include <arch/mm/cache.h> |
81 | #include <arch/mm/cache.h> |
82 | #endif /* CONFIG_VIRT_IDX_DCACHE */ |
82 | #endif /* CONFIG_VIRT_IDX_DCACHE */ |
83 | 83 | ||
84 | /** |
84 | /** |
85 | * Each architecture decides what functions will be used to carry out |
85 | * Each architecture decides what functions will be used to carry out |
86 | * address space operations such as creating or locking page tables. |
86 | * address space operations such as creating or locking page tables. |
87 | */ |
87 | */ |
88 | as_operations_t *as_operations = NULL; |
88 | as_operations_t *as_operations = NULL; |
89 | 89 | ||
90 | /** |
90 | /** |
91 | * Slab for as_t objects. |
91 | * Slab for as_t objects. |
92 | */ |
92 | */ |
93 | static slab_cache_t *as_slab; |
93 | static slab_cache_t *as_slab; |
94 | 94 | ||
95 | /** |
95 | /** |
96 | * This lock protects inactive_as_with_asid_head list. It must be acquired |
96 | * This lock protects inactive_as_with_asid_head list. It must be acquired |
97 | * before as_t mutex. |
97 | * before as_t mutex. |
98 | */ |
98 | */ |
99 | SPINLOCK_INITIALIZE(inactive_as_with_asid_lock); |
99 | SPINLOCK_INITIALIZE(inactive_as_with_asid_lock); |
100 | 100 | ||
101 | /** |
101 | /** |
102 | * This list contains address spaces that are not active on any |
102 | * This list contains address spaces that are not active on any |
103 | * processor and that have valid ASID. |
103 | * processor and that have valid ASID. |
104 | */ |
104 | */ |
105 | LIST_INITIALIZE(inactive_as_with_asid_head); |
105 | LIST_INITIALIZE(inactive_as_with_asid_head); |
106 | 106 | ||
107 | /** Kernel address space. */ |
107 | /** Kernel address space. */ |
108 | as_t *AS_KERNEL = NULL; |
108 | as_t *AS_KERNEL = NULL; |
109 | 109 | ||
110 | static int area_flags_to_page_flags(int aflags); |
110 | static int area_flags_to_page_flags(int aflags); |
111 | static as_area_t *find_area_and_lock(as_t *as, uintptr_t va); |
111 | static as_area_t *find_area_and_lock(as_t *as, uintptr_t va); |
112 | static bool check_area_conflicts(as_t *as, uintptr_t va, size_t size, |
112 | static bool check_area_conflicts(as_t *as, uintptr_t va, size_t size, |
113 | as_area_t *avoid_area); |
113 | as_area_t *avoid_area); |
114 | static void sh_info_remove_reference(share_info_t *sh_info); |
114 | static void sh_info_remove_reference(share_info_t *sh_info); |
115 | 115 | ||
116 | static int as_constructor(void *obj, int flags) |
116 | static int as_constructor(void *obj, int flags) |
117 | { |
117 | { |
118 | as_t *as = (as_t *) obj; |
118 | as_t *as = (as_t *) obj; |
119 | int rc; |
119 | int rc; |
120 | 120 | ||
121 | link_initialize(&as->inactive_as_with_asid_link); |
121 | link_initialize(&as->inactive_as_with_asid_link); |
122 | mutex_initialize(&as->lock); |
122 | mutex_initialize(&as->lock); |
123 | 123 | ||
124 | rc = as_constructor_arch(as, flags); |
124 | rc = as_constructor_arch(as, flags); |
125 | 125 | ||
126 | return rc; |
126 | return rc; |
127 | } |
127 | } |
128 | 128 | ||
129 | static int as_destructor(void *obj) |
129 | static int as_destructor(void *obj) |
130 | { |
130 | { |
131 | as_t *as = (as_t *) obj; |
131 | as_t *as = (as_t *) obj; |
132 | 132 | ||
133 | return as_destructor_arch(as); |
133 | return as_destructor_arch(as); |
134 | } |
134 | } |
135 | 135 | ||
136 | /** Initialize address space subsystem. */ |
136 | /** Initialize address space subsystem. */ |
137 | void as_init(void) |
137 | void as_init(void) |
138 | { |
138 | { |
139 | as_arch_init(); |
139 | as_arch_init(); |
140 | 140 | ||
141 | as_slab = slab_cache_create("as_slab", sizeof(as_t), 0, |
141 | as_slab = slab_cache_create("as_slab", sizeof(as_t), 0, |
142 | as_constructor, as_destructor, SLAB_CACHE_MAGDEFERRED); |
142 | as_constructor, as_destructor, SLAB_CACHE_MAGDEFERRED); |
143 | 143 | ||
144 | AS_KERNEL = as_create(FLAG_AS_KERNEL); |
144 | AS_KERNEL = as_create(FLAG_AS_KERNEL); |
145 | if (!AS_KERNEL) |
145 | if (!AS_KERNEL) |
146 | panic("can't create kernel address space\n"); |
146 | panic("can't create kernel address space\n"); |
147 | 147 | ||
148 | } |
148 | } |
149 | 149 | ||
150 | /** Create address space. |
150 | /** Create address space. |
151 | * |
151 | * |
152 | * @param flags Flags that influence way in wich the address space is created. |
152 | * @param flags Flags that influence way in wich the address space is created. |
153 | */ |
153 | */ |
154 | as_t *as_create(int flags) |
154 | as_t *as_create(int flags) |
155 | { |
155 | { |
156 | as_t *as; |
156 | as_t *as; |
157 | 157 | ||
158 | as = (as_t *) slab_alloc(as_slab, 0); |
158 | as = (as_t *) slab_alloc(as_slab, 0); |
159 | (void) as_create_arch(as, 0); |
159 | (void) as_create_arch(as, 0); |
160 | 160 | ||
161 | btree_create(&as->as_area_btree); |
161 | btree_create(&as->as_area_btree); |
162 | 162 | ||
163 | if (flags & FLAG_AS_KERNEL) |
163 | if (flags & FLAG_AS_KERNEL) |
164 | as->asid = ASID_KERNEL; |
164 | as->asid = ASID_KERNEL; |
165 | else |
165 | else |
166 | as->asid = ASID_INVALID; |
166 | as->asid = ASID_INVALID; |
167 | 167 | ||
168 | as->refcount = 0; |
168 | as->refcount = 0; |
169 | as->cpu_refcount = 0; |
169 | as->cpu_refcount = 0; |
170 | #ifdef AS_PAGE_TABLE |
170 | #ifdef AS_PAGE_TABLE |
171 | as->page_table = page_table_create(flags); |
171 | as->page_table = page_table_create(flags); |
172 | #else |
172 | #else |
173 | page_table_create(flags); |
173 | page_table_create(flags); |
174 | #endif |
174 | #endif |
175 | 175 | ||
176 | return as; |
176 | return as; |
177 | } |
177 | } |
178 | 178 | ||
179 | /** Destroy adress space. |
179 | /** Destroy adress space. |
180 | * |
180 | * |
181 | * When there are no tasks referencing this address space (i.e. its refcount is |
181 | * When there are no tasks referencing this address space (i.e. its refcount is |
182 | * zero), the address space can be destroyed. |
182 | * zero), the address space can be destroyed. |
183 | */ |
183 | */ |
184 | void as_destroy(as_t *as) |
184 | void as_destroy(as_t *as) |
185 | { |
185 | { |
186 | ipl_t ipl; |
186 | ipl_t ipl; |
187 | bool cond; |
187 | bool cond; |
188 | 188 | ||
189 | ASSERT(as->refcount == 0); |
189 | ASSERT(as->refcount == 0); |
190 | 190 | ||
191 | /* |
191 | /* |
192 | * Since there is no reference to this area, |
192 | * Since there is no reference to this area, |
193 | * it is safe not to lock its mutex. |
193 | * it is safe not to lock its mutex. |
194 | */ |
194 | */ |
195 | ipl = interrupts_disable(); |
195 | ipl = interrupts_disable(); |
196 | spinlock_lock(&inactive_as_with_asid_lock); |
196 | spinlock_lock(&inactive_as_with_asid_lock); |
197 | if (as->asid != ASID_INVALID && as != AS_KERNEL) { |
197 | if (as->asid != ASID_INVALID && as != AS_KERNEL) { |
198 | if (as != AS && as->cpu_refcount == 0) |
198 | if (as != AS && as->cpu_refcount == 0) |
199 | list_remove(&as->inactive_as_with_asid_link); |
199 | list_remove(&as->inactive_as_with_asid_link); |
200 | asid_put(as->asid); |
200 | asid_put(as->asid); |
201 | } |
201 | } |
202 | spinlock_unlock(&inactive_as_with_asid_lock); |
202 | spinlock_unlock(&inactive_as_with_asid_lock); |
203 | 203 | ||
204 | /* |
204 | /* |
205 | * Destroy address space areas of the address space. |
205 | * Destroy address space areas of the address space. |
206 | * The B+tree must be walked carefully because it is |
206 | * The B+tree must be walked carefully because it is |
207 | * also being destroyed. |
207 | * also being destroyed. |
208 | */ |
208 | */ |
209 | for (cond = true; cond; ) { |
209 | for (cond = true; cond; ) { |
210 | btree_node_t *node; |
210 | btree_node_t *node; |
211 | 211 | ||
212 | ASSERT(!list_empty(&as->as_area_btree.leaf_head)); |
212 | ASSERT(!list_empty(&as->as_area_btree.leaf_head)); |
213 | node = list_get_instance(as->as_area_btree.leaf_head.next, |
213 | node = list_get_instance(as->as_area_btree.leaf_head.next, |
214 | btree_node_t, leaf_link); |
214 | btree_node_t, leaf_link); |
215 | 215 | ||
216 | if ((cond = node->keys)) { |
216 | if ((cond = node->keys)) { |
217 | as_area_destroy(as, node->key[0]); |
217 | as_area_destroy(as, node->key[0]); |
218 | } |
218 | } |
219 | } |
219 | } |
220 | 220 | ||
221 | btree_destroy(&as->as_area_btree); |
221 | btree_destroy(&as->as_area_btree); |
222 | #ifdef AS_PAGE_TABLE |
222 | #ifdef AS_PAGE_TABLE |
223 | page_table_destroy(as->page_table); |
223 | page_table_destroy(as->page_table); |
224 | #else |
224 | #else |
225 | page_table_destroy(NULL); |
225 | page_table_destroy(NULL); |
226 | #endif |
226 | #endif |
227 | 227 | ||
228 | interrupts_restore(ipl); |
228 | interrupts_restore(ipl); |
229 | 229 | ||
230 | slab_free(as_slab, as); |
230 | slab_free(as_slab, as); |
231 | } |
231 | } |
232 | 232 | ||
233 | /** Create address space area of common attributes. |
233 | /** Create address space area of common attributes. |
234 | * |
234 | * |
235 | * The created address space area is added to the target address space. |
235 | * The created address space area is added to the target address space. |
236 | * |
236 | * |
237 | * @param as Target address space. |
237 | * @param as Target address space. |
238 | * @param flags Flags of the area memory. |
238 | * @param flags Flags of the area memory. |
239 | * @param size Size of area. |
239 | * @param size Size of area. |
240 | * @param base Base address of area. |
240 | * @param base Base address of area. |
241 | * @param attrs Attributes of the area. |
241 | * @param attrs Attributes of the area. |
242 | * @param backend Address space area backend. NULL if no backend is used. |
242 | * @param backend Address space area backend. NULL if no backend is used. |
243 | * @param backend_data NULL or a pointer to an array holding two void *. |
243 | * @param backend_data NULL or a pointer to an array holding two void *. |
244 | * |
244 | * |
245 | * @return Address space area on success or NULL on failure. |
245 | * @return Address space area on success or NULL on failure. |
246 | */ |
246 | */ |
247 | as_area_t * |
247 | as_area_t * |
248 | as_area_create(as_t *as, int flags, size_t size, uintptr_t base, int attrs, |
248 | as_area_create(as_t *as, int flags, size_t size, uintptr_t base, int attrs, |
249 | mem_backend_t *backend, mem_backend_data_t *backend_data) |
249 | mem_backend_t *backend, mem_backend_data_t *backend_data) |
250 | { |
250 | { |
251 | ipl_t ipl; |
251 | ipl_t ipl; |
252 | as_area_t *a; |
252 | as_area_t *a; |
253 | 253 | ||
254 | if (base % PAGE_SIZE) |
254 | if (base % PAGE_SIZE) |
255 | return NULL; |
255 | return NULL; |
256 | 256 | ||
257 | if (!size) |
257 | if (!size) |
258 | return NULL; |
258 | return NULL; |
259 | 259 | ||
260 | /* Writeable executable areas are not supported. */ |
260 | /* Writeable executable areas are not supported. */ |
261 | if ((flags & AS_AREA_EXEC) && (flags & AS_AREA_WRITE)) |
261 | if ((flags & AS_AREA_EXEC) && (flags & AS_AREA_WRITE)) |
262 | return NULL; |
262 | return NULL; |
263 | 263 | ||
264 | ipl = interrupts_disable(); |
264 | ipl = interrupts_disable(); |
265 | mutex_lock(&as->lock); |
265 | mutex_lock(&as->lock); |
266 | 266 | ||
267 | if (!check_area_conflicts(as, base, size, NULL)) { |
267 | if (!check_area_conflicts(as, base, size, NULL)) { |
268 | mutex_unlock(&as->lock); |
268 | mutex_unlock(&as->lock); |
269 | interrupts_restore(ipl); |
269 | interrupts_restore(ipl); |
270 | return NULL; |
270 | return NULL; |
271 | } |
271 | } |
272 | 272 | ||
273 | a = (as_area_t *) malloc(sizeof(as_area_t), 0); |
273 | a = (as_area_t *) malloc(sizeof(as_area_t), 0); |
274 | 274 | ||
275 | mutex_initialize(&a->lock); |
275 | mutex_initialize(&a->lock); |
276 | 276 | ||
277 | a->as = as; |
277 | a->as = as; |
278 | a->flags = flags; |
278 | a->flags = flags; |
279 | a->attributes = attrs; |
279 | a->attributes = attrs; |
280 | a->pages = SIZE2FRAMES(size); |
280 | a->pages = SIZE2FRAMES(size); |
281 | a->base = base; |
281 | a->base = base; |
282 | a->sh_info = NULL; |
282 | a->sh_info = NULL; |
283 | a->backend = backend; |
283 | a->backend = backend; |
284 | if (backend_data) |
284 | if (backend_data) |
285 | a->backend_data = *backend_data; |
285 | a->backend_data = *backend_data; |
286 | else |
286 | else |
287 | memsetb((uintptr_t) &a->backend_data, sizeof(a->backend_data), |
287 | memsetb((uintptr_t) &a->backend_data, sizeof(a->backend_data), |
288 | 0); |
288 | 0); |
289 | 289 | ||
290 | btree_create(&a->used_space); |
290 | btree_create(&a->used_space); |
291 | 291 | ||
292 | btree_insert(&as->as_area_btree, base, (void *) a, NULL); |
292 | btree_insert(&as->as_area_btree, base, (void *) a, NULL); |
293 | 293 | ||
294 | mutex_unlock(&as->lock); |
294 | mutex_unlock(&as->lock); |
295 | interrupts_restore(ipl); |
295 | interrupts_restore(ipl); |
296 | 296 | ||
297 | return a; |
297 | return a; |
298 | } |
298 | } |
299 | 299 | ||
300 | /** Find address space area and change it. |
300 | /** Find address space area and change it. |
301 | * |
301 | * |
302 | * @param as Address space. |
302 | * @param as Address space. |
303 | * @param address Virtual address belonging to the area to be changed. Must be |
303 | * @param address Virtual address belonging to the area to be changed. Must be |
304 | * page-aligned. |
304 | * page-aligned. |
305 | * @param size New size of the virtual memory block starting at address. |
305 | * @param size New size of the virtual memory block starting at address. |
306 | * @param flags Flags influencing the remap operation. Currently unused. |
306 | * @param flags Flags influencing the remap operation. Currently unused. |
307 | * |
307 | * |
308 | * @return Zero on success or a value from @ref errno.h otherwise. |
308 | * @return Zero on success or a value from @ref errno.h otherwise. |
309 | */ |
309 | */ |
310 | int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags) |
310 | int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags) |
311 | { |
311 | { |
312 | as_area_t *area; |
312 | as_area_t *area; |
313 | ipl_t ipl; |
313 | ipl_t ipl; |
314 | size_t pages; |
314 | size_t pages; |
315 | 315 | ||
316 | ipl = interrupts_disable(); |
316 | ipl = interrupts_disable(); |
317 | mutex_lock(&as->lock); |
317 | mutex_lock(&as->lock); |
318 | 318 | ||
319 | /* |
319 | /* |
320 | * Locate the area. |
320 | * Locate the area. |
321 | */ |
321 | */ |
322 | area = find_area_and_lock(as, address); |
322 | area = find_area_and_lock(as, address); |
323 | if (!area) { |
323 | if (!area) { |
324 | mutex_unlock(&as->lock); |
324 | mutex_unlock(&as->lock); |
325 | interrupts_restore(ipl); |
325 | interrupts_restore(ipl); |
326 | return ENOENT; |
326 | return ENOENT; |
327 | } |
327 | } |
328 | 328 | ||
329 | if (area->backend == &phys_backend) { |
329 | if (area->backend == &phys_backend) { |
330 | /* |
330 | /* |
331 | * Remapping of address space areas associated |
331 | * Remapping of address space areas associated |
332 | * with memory mapped devices is not supported. |
332 | * with memory mapped devices is not supported. |
333 | */ |
333 | */ |
334 | mutex_unlock(&area->lock); |
334 | mutex_unlock(&area->lock); |
335 | mutex_unlock(&as->lock); |
335 | mutex_unlock(&as->lock); |
336 | interrupts_restore(ipl); |
336 | interrupts_restore(ipl); |
337 | return ENOTSUP; |
337 | return ENOTSUP; |
338 | } |
338 | } |
339 | if (area->sh_info) { |
339 | if (area->sh_info) { |
340 | /* |
340 | /* |
341 | * Remapping of shared address space areas |
341 | * Remapping of shared address space areas |
342 | * is not supported. |
342 | * is not supported. |
343 | */ |
343 | */ |
344 | mutex_unlock(&area->lock); |
344 | mutex_unlock(&area->lock); |
345 | mutex_unlock(&as->lock); |
345 | mutex_unlock(&as->lock); |
346 | interrupts_restore(ipl); |
346 | interrupts_restore(ipl); |
347 | return ENOTSUP; |
347 | return ENOTSUP; |
348 | } |
348 | } |
349 | 349 | ||
350 | pages = SIZE2FRAMES((address - area->base) + size); |
350 | pages = SIZE2FRAMES((address - area->base) + size); |
351 | if (!pages) { |
351 | if (!pages) { |
352 | /* |
352 | /* |
353 | * Zero size address space areas are not allowed. |
353 | * Zero size address space areas are not allowed. |
354 | */ |
354 | */ |
355 | mutex_unlock(&area->lock); |
355 | mutex_unlock(&area->lock); |
356 | mutex_unlock(&as->lock); |
356 | mutex_unlock(&as->lock); |
357 | interrupts_restore(ipl); |
357 | interrupts_restore(ipl); |
358 | return EPERM; |
358 | return EPERM; |
359 | } |
359 | } |
360 | 360 | ||
361 | if (pages < area->pages) { |
361 | if (pages < area->pages) { |
362 | bool cond; |
362 | bool cond; |
363 | uintptr_t start_free = area->base + pages*PAGE_SIZE; |
363 | uintptr_t start_free = area->base + pages*PAGE_SIZE; |
364 | 364 | ||
365 | /* |
365 | /* |
366 | * Shrinking the area. |
366 | * Shrinking the area. |
367 | * No need to check for overlaps. |
367 | * No need to check for overlaps. |
368 | */ |
368 | */ |
369 | 369 | ||
370 | /* |
370 | /* |
371 | * Start TLB shootdown sequence. |
371 | * Start TLB shootdown sequence. |
372 | */ |
372 | */ |
373 | tlb_shootdown_start(TLB_INVL_PAGES, AS->asid, area->base + |
373 | tlb_shootdown_start(TLB_INVL_PAGES, AS->asid, area->base + |
374 | pages * PAGE_SIZE, area->pages - pages); |
374 | pages * PAGE_SIZE, area->pages - pages); |
375 | 375 | ||
376 | /* |
376 | /* |
377 | * Remove frames belonging to used space starting from |
377 | * Remove frames belonging to used space starting from |
378 | * the highest addresses downwards until an overlap with |
378 | * the highest addresses downwards until an overlap with |
379 | * the resized address space area is found. Note that this |
379 | * the resized address space area is found. Note that this |
380 | * is also the right way to remove part of the used_space |
380 | * is also the right way to remove part of the used_space |
381 | * B+tree leaf list. |
381 | * B+tree leaf list. |
382 | */ |
382 | */ |
383 | for (cond = true; cond;) { |
383 | for (cond = true; cond;) { |
384 | btree_node_t *node; |
384 | btree_node_t *node; |
385 | 385 | ||
386 | ASSERT(!list_empty(&area->used_space.leaf_head)); |
386 | ASSERT(!list_empty(&area->used_space.leaf_head)); |
387 | node = |
387 | node = |
388 | list_get_instance(area->used_space.leaf_head.prev, |
388 | list_get_instance(area->used_space.leaf_head.prev, |
389 | btree_node_t, leaf_link); |
389 | btree_node_t, leaf_link); |
390 | if ((cond = (bool) node->keys)) { |
390 | if ((cond = (bool) node->keys)) { |
391 | uintptr_t b = node->key[node->keys - 1]; |
391 | uintptr_t b = node->key[node->keys - 1]; |
392 | count_t c = |
392 | count_t c = |
393 | (count_t) node->value[node->keys - 1]; |
393 | (count_t) node->value[node->keys - 1]; |
394 | int i = 0; |
394 | int i = 0; |
395 | 395 | ||
396 | if (overlaps(b, c * PAGE_SIZE, area->base, |
396 | if (overlaps(b, c * PAGE_SIZE, area->base, |
397 | pages*PAGE_SIZE)) { |
397 | pages*PAGE_SIZE)) { |
398 | 398 | ||
399 | if (b + c * PAGE_SIZE <= start_free) { |
399 | if (b + c * PAGE_SIZE <= start_free) { |
400 | /* |
400 | /* |
401 | * The whole interval fits |
401 | * The whole interval fits |
402 | * completely in the resized |
402 | * completely in the resized |
403 | * address space area. |
403 | * address space area. |
404 | */ |
404 | */ |
405 | break; |
405 | break; |
406 | } |
406 | } |
407 | 407 | ||
408 | /* |
408 | /* |
409 | * Part of the interval corresponding |
409 | * Part of the interval corresponding |
410 | * to b and c overlaps with the resized |
410 | * to b and c overlaps with the resized |
411 | * address space area. |
411 | * address space area. |
412 | */ |
412 | */ |
413 | 413 | ||
414 | cond = false; /* we are almost done */ |
414 | cond = false; /* we are almost done */ |
415 | i = (start_free - b) >> PAGE_WIDTH; |
415 | i = (start_free - b) >> PAGE_WIDTH; |
416 | if (!used_space_remove(area, start_free, |
416 | if (!used_space_remove(area, start_free, |
417 | c - i)) |
417 | c - i)) |
418 | panic("Could not remove used " |
418 | panic("Could not remove used " |
419 | "space.\n"); |
419 | "space.\n"); |
420 | } else { |
420 | } else { |
421 | /* |
421 | /* |
422 | * The interval of used space can be |
422 | * The interval of used space can be |
423 | * completely removed. |
423 | * completely removed. |
424 | */ |
424 | */ |
425 | if (!used_space_remove(area, b, c)) |
425 | if (!used_space_remove(area, b, c)) |
426 | panic("Could not remove used " |
426 | panic("Could not remove used " |
427 | "space.\n"); |
427 | "space.\n"); |
428 | } |
428 | } |
429 | 429 | ||
430 | for (; i < c; i++) { |
430 | for (; i < c; i++) { |
431 | pte_t *pte; |
431 | pte_t *pte; |
432 | 432 | ||
433 | page_table_lock(as, false); |
433 | page_table_lock(as, false); |
434 | pte = page_mapping_find(as, b + |
434 | pte = page_mapping_find(as, b + |
435 | i * PAGE_SIZE); |
435 | i * PAGE_SIZE); |
436 | ASSERT(pte && PTE_VALID(pte) && |
436 | ASSERT(pte && PTE_VALID(pte) && |
437 | PTE_PRESENT(pte)); |
437 | PTE_PRESENT(pte)); |
438 | if (area->backend && |
438 | if (area->backend && |
439 | area->backend->frame_free) { |
439 | area->backend->frame_free) { |
440 | area->backend->frame_free(area, |
440 | area->backend->frame_free(area, |
441 | b + i * PAGE_SIZE, |
441 | b + i * PAGE_SIZE, |
442 | PTE_GET_FRAME(pte)); |
442 | PTE_GET_FRAME(pte)); |
443 | } |
443 | } |
444 | page_mapping_remove(as, b + |
444 | page_mapping_remove(as, b + |
445 | i * PAGE_SIZE); |
445 | i * PAGE_SIZE); |
446 | page_table_unlock(as, false); |
446 | page_table_unlock(as, false); |
447 | } |
447 | } |
448 | } |
448 | } |
449 | } |
449 | } |
450 | 450 | ||
451 | /* |
451 | /* |
452 | * Finish TLB shootdown sequence. |
452 | * Finish TLB shootdown sequence. |
453 | */ |
453 | */ |
454 | tlb_invalidate_pages(as->asid, area->base + pages * PAGE_SIZE, |
454 | tlb_invalidate_pages(as->asid, area->base + pages * PAGE_SIZE, |
455 | area->pages - pages); |
455 | area->pages - pages); |
456 | tlb_shootdown_finalize(); |
456 | tlb_shootdown_finalize(); |
457 | 457 | ||
458 | /* |
458 | /* |
459 | * Invalidate software translation caches (e.g. TSB on sparc64). |
459 | * Invalidate software translation caches (e.g. TSB on sparc64). |
460 | */ |
460 | */ |
461 | as_invalidate_translation_cache(as, area->base + |
461 | as_invalidate_translation_cache(as, area->base + |
462 | pages * PAGE_SIZE, area->pages - pages); |
462 | pages * PAGE_SIZE, area->pages - pages); |
463 | } else { |
463 | } else { |
464 | /* |
464 | /* |
465 | * Growing the area. |
465 | * Growing the area. |
466 | * Check for overlaps with other address space areas. |
466 | * Check for overlaps with other address space areas. |
467 | */ |
467 | */ |
468 | if (!check_area_conflicts(as, address, pages * PAGE_SIZE, |
468 | if (!check_area_conflicts(as, address, pages * PAGE_SIZE, |
469 | area)) { |
469 | area)) { |
470 | mutex_unlock(&area->lock); |
470 | mutex_unlock(&area->lock); |
471 | mutex_unlock(&as->lock); |
471 | mutex_unlock(&as->lock); |
472 | interrupts_restore(ipl); |
472 | interrupts_restore(ipl); |
473 | return EADDRNOTAVAIL; |
473 | return EADDRNOTAVAIL; |
474 | } |
474 | } |
475 | } |
475 | } |
476 | 476 | ||
477 | area->pages = pages; |
477 | area->pages = pages; |
478 | 478 | ||
479 | mutex_unlock(&area->lock); |
479 | mutex_unlock(&area->lock); |
480 | mutex_unlock(&as->lock); |
480 | mutex_unlock(&as->lock); |
481 | interrupts_restore(ipl); |
481 | interrupts_restore(ipl); |
482 | 482 | ||
483 | return 0; |
483 | return 0; |
484 | } |
484 | } |
485 | 485 | ||
486 | /** Destroy address space area. |
486 | /** Destroy address space area. |
487 | * |
487 | * |
488 | * @param as Address space. |
488 | * @param as Address space. |
489 | * @param address Address withing the area to be deleted. |
489 | * @param address Address withing the area to be deleted. |
490 | * |
490 | * |
491 | * @return Zero on success or a value from @ref errno.h on failure. |
491 | * @return Zero on success or a value from @ref errno.h on failure. |
492 | */ |
492 | */ |
493 | int as_area_destroy(as_t *as, uintptr_t address) |
493 | int as_area_destroy(as_t *as, uintptr_t address) |
494 | { |
494 | { |
495 | as_area_t *area; |
495 | as_area_t *area; |
496 | uintptr_t base; |
496 | uintptr_t base; |
497 | link_t *cur; |
497 | link_t *cur; |
498 | ipl_t ipl; |
498 | ipl_t ipl; |
499 | 499 | ||
500 | ipl = interrupts_disable(); |
500 | ipl = interrupts_disable(); |
501 | mutex_lock(&as->lock); |
501 | mutex_lock(&as->lock); |
502 | 502 | ||
503 | area = find_area_and_lock(as, address); |
503 | area = find_area_and_lock(as, address); |
504 | if (!area) { |
504 | if (!area) { |
505 | mutex_unlock(&as->lock); |
505 | mutex_unlock(&as->lock); |
506 | interrupts_restore(ipl); |
506 | interrupts_restore(ipl); |
507 | return ENOENT; |
507 | return ENOENT; |
508 | } |
508 | } |
509 | 509 | ||
510 | base = area->base; |
510 | base = area->base; |
511 | 511 | ||
512 | /* |
512 | /* |
513 | * Start TLB shootdown sequence. |
513 | * Start TLB shootdown sequence. |
514 | */ |
514 | */ |
515 | tlb_shootdown_start(TLB_INVL_PAGES, as->asid, area->base, area->pages); |
515 | tlb_shootdown_start(TLB_INVL_PAGES, as->asid, area->base, area->pages); |
516 | 516 | ||
517 | /* |
517 | /* |
518 | * Visit only the pages mapped by used_space B+tree. |
518 | * Visit only the pages mapped by used_space B+tree. |
519 | */ |
519 | */ |
520 | for (cur = area->used_space.leaf_head.next; |
520 | for (cur = area->used_space.leaf_head.next; |
521 | cur != &area->used_space.leaf_head; cur = cur->next) { |
521 | cur != &area->used_space.leaf_head; cur = cur->next) { |
522 | btree_node_t *node; |
522 | btree_node_t *node; |
523 | int i; |
523 | int i; |
524 | 524 | ||
525 | node = list_get_instance(cur, btree_node_t, leaf_link); |
525 | node = list_get_instance(cur, btree_node_t, leaf_link); |
526 | for (i = 0; i < node->keys; i++) { |
526 | for (i = 0; i < node->keys; i++) { |
527 | uintptr_t b = node->key[i]; |
527 | uintptr_t b = node->key[i]; |
528 | count_t j; |
528 | count_t j; |
529 | pte_t *pte; |
529 | pte_t *pte; |
530 | 530 | ||
531 | for (j = 0; j < (count_t) node->value[i]; j++) { |
531 | for (j = 0; j < (count_t) node->value[i]; j++) { |
532 | page_table_lock(as, false); |
532 | page_table_lock(as, false); |
533 | pte = page_mapping_find(as, b + j * PAGE_SIZE); |
533 | pte = page_mapping_find(as, b + j * PAGE_SIZE); |
534 | ASSERT(pte && PTE_VALID(pte) && |
534 | ASSERT(pte && PTE_VALID(pte) && |
535 | PTE_PRESENT(pte)); |
535 | PTE_PRESENT(pte)); |
536 | if (area->backend && |
536 | if (area->backend && |
537 | area->backend->frame_free) { |
537 | area->backend->frame_free) { |
538 | area->backend->frame_free(area, b + |
538 | area->backend->frame_free(area, b + |
539 | j * PAGE_SIZE, PTE_GET_FRAME(pte)); |
539 | j * PAGE_SIZE, PTE_GET_FRAME(pte)); |
540 | } |
540 | } |
541 | page_mapping_remove(as, b + j * PAGE_SIZE); |
541 | page_mapping_remove(as, b + j * PAGE_SIZE); |
542 | page_table_unlock(as, false); |
542 | page_table_unlock(as, false); |
543 | } |
543 | } |
544 | } |
544 | } |
545 | } |
545 | } |
546 | 546 | ||
547 | /* |
547 | /* |
548 | * Finish TLB shootdown sequence. |
548 | * Finish TLB shootdown sequence. |
549 | */ |
549 | */ |
550 | tlb_invalidate_pages(as->asid, area->base, area->pages); |
550 | tlb_invalidate_pages(as->asid, area->base, area->pages); |
551 | tlb_shootdown_finalize(); |
551 | tlb_shootdown_finalize(); |
552 | 552 | ||
553 | /* |
553 | /* |
554 | * Invalidate potential software translation caches (e.g. TSB on |
554 | * Invalidate potential software translation caches (e.g. TSB on |
555 | * sparc64). |
555 | * sparc64). |
556 | */ |
556 | */ |
557 | as_invalidate_translation_cache(as, area->base, area->pages); |
557 | as_invalidate_translation_cache(as, area->base, area->pages); |
558 | 558 | ||
559 | btree_destroy(&area->used_space); |
559 | btree_destroy(&area->used_space); |
560 | 560 | ||
561 | area->attributes |= AS_AREA_ATTR_PARTIAL; |
561 | area->attributes |= AS_AREA_ATTR_PARTIAL; |
562 | 562 | ||
563 | if (area->sh_info) |
563 | if (area->sh_info) |
564 | sh_info_remove_reference(area->sh_info); |
564 | sh_info_remove_reference(area->sh_info); |
565 | 565 | ||
566 | mutex_unlock(&area->lock); |
566 | mutex_unlock(&area->lock); |
567 | 567 | ||
568 | /* |
568 | /* |
569 | * Remove the empty area from address space. |
569 | * Remove the empty area from address space. |
570 | */ |
570 | */ |
571 | btree_remove(&as->as_area_btree, base, NULL); |
571 | btree_remove(&as->as_area_btree, base, NULL); |
572 | 572 | ||
573 | free(area); |
573 | free(area); |
574 | 574 | ||
575 | mutex_unlock(&as->lock); |
575 | mutex_unlock(&as->lock); |
576 | interrupts_restore(ipl); |
576 | interrupts_restore(ipl); |
577 | return 0; |
577 | return 0; |
578 | } |
578 | } |
579 | 579 | ||
580 | /** Share address space area with another or the same address space. |
580 | /** Share address space area with another or the same address space. |
581 | * |
581 | * |
582 | * Address space area mapping is shared with a new address space area. |
582 | * Address space area mapping is shared with a new address space area. |
583 | * If the source address space area has not been shared so far, |
583 | * If the source address space area has not been shared so far, |
584 | * a new sh_info is created. The new address space area simply gets the |
584 | * a new sh_info is created. The new address space area simply gets the |
585 | * sh_info of the source area. The process of duplicating the |
585 | * sh_info of the source area. The process of duplicating the |
586 | * mapping is done through the backend share function. |
586 | * mapping is done through the backend share function. |
587 | * |
587 | * |
588 | * @param src_as Pointer to source address space. |
588 | * @param src_as Pointer to source address space. |
589 | * @param src_base Base address of the source address space area. |
589 | * @param src_base Base address of the source address space area. |
590 | * @param acc_size Expected size of the source area. |
590 | * @param acc_size Expected size of the source area. |
591 | * @param dst_as Pointer to destination address space. |
591 | * @param dst_as Pointer to destination address space. |
592 | * @param dst_base Target base address. |
592 | * @param dst_base Target base address. |
593 | * @param dst_flags_mask Destination address space area flags mask. |
593 | * @param dst_flags_mask Destination address space area flags mask. |
594 | * |
594 | * |
595 | * @return Zero on success or ENOENT if there is no such task or if there is no |
595 | * @return Zero on success or ENOENT if there is no such task or if there is no |
596 | * such address space area, EPERM if there was a problem in accepting the area |
596 | * such address space area, EPERM if there was a problem in accepting the area |
597 | * or ENOMEM if there was a problem in allocating destination address space |
597 | * or ENOMEM if there was a problem in allocating destination address space |
598 | * area. ENOTSUP is returned if the address space area backend does not support |
598 | * area. ENOTSUP is returned if the address space area backend does not support |
599 | * sharing or if the kernel detects an attempt to create an illegal address |
599 | * sharing or if the kernel detects an attempt to create an illegal address |
600 | * alias. |
600 | * alias. |
601 | */ |
601 | */ |
602 | int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size, |
602 | int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size, |
603 | as_t *dst_as, uintptr_t dst_base, int dst_flags_mask) |
603 | as_t *dst_as, uintptr_t dst_base, int dst_flags_mask) |
604 | { |
604 | { |
605 | ipl_t ipl; |
605 | ipl_t ipl; |
606 | int src_flags; |
606 | int src_flags; |
607 | size_t src_size; |
607 | size_t src_size; |
608 | as_area_t *src_area, *dst_area; |
608 | as_area_t *src_area, *dst_area; |
609 | share_info_t *sh_info; |
609 | share_info_t *sh_info; |
610 | mem_backend_t *src_backend; |
610 | mem_backend_t *src_backend; |
611 | mem_backend_data_t src_backend_data; |
611 | mem_backend_data_t src_backend_data; |
612 | 612 | ||
613 | ipl = interrupts_disable(); |
613 | ipl = interrupts_disable(); |
614 | mutex_lock(&src_as->lock); |
614 | mutex_lock(&src_as->lock); |
615 | src_area = find_area_and_lock(src_as, src_base); |
615 | src_area = find_area_and_lock(src_as, src_base); |
616 | if (!src_area) { |
616 | if (!src_area) { |
617 | /* |
617 | /* |
618 | * Could not find the source address space area. |
618 | * Could not find the source address space area. |
619 | */ |
619 | */ |
620 | mutex_unlock(&src_as->lock); |
620 | mutex_unlock(&src_as->lock); |
621 | interrupts_restore(ipl); |
621 | interrupts_restore(ipl); |
622 | return ENOENT; |
622 | return ENOENT; |
623 | } |
623 | } |
624 | 624 | ||
625 | if (!src_area->backend || !src_area->backend->share) { |
625 | if (!src_area->backend || !src_area->backend->share) { |
626 | /* |
626 | /* |
627 | * There is no backend or the backend does not |
627 | * There is no backend or the backend does not |
628 | * know how to share the area. |
628 | * know how to share the area. |
629 | */ |
629 | */ |
630 | mutex_unlock(&src_area->lock); |
630 | mutex_unlock(&src_area->lock); |
631 | mutex_unlock(&src_as->lock); |
631 | mutex_unlock(&src_as->lock); |
632 | interrupts_restore(ipl); |
632 | interrupts_restore(ipl); |
633 | return ENOTSUP; |
633 | return ENOTSUP; |
634 | } |
634 | } |
635 | 635 | ||
636 | src_size = src_area->pages * PAGE_SIZE; |
636 | src_size = src_area->pages * PAGE_SIZE; |
637 | src_flags = src_area->flags; |
637 | src_flags = src_area->flags; |
638 | src_backend = src_area->backend; |
638 | src_backend = src_area->backend; |
639 | src_backend_data = src_area->backend_data; |
639 | src_backend_data = src_area->backend_data; |
640 | 640 | ||
641 | /* Share the cacheable flag from the original mapping */ |
641 | /* Share the cacheable flag from the original mapping */ |
642 | if (src_flags & AS_AREA_CACHEABLE) |
642 | if (src_flags & AS_AREA_CACHEABLE) |
643 | dst_flags_mask |= AS_AREA_CACHEABLE; |
643 | dst_flags_mask |= AS_AREA_CACHEABLE; |
644 | 644 | ||
645 | if (src_size != acc_size || |
645 | if (src_size != acc_size || |
646 | (src_flags & dst_flags_mask) != dst_flags_mask) { |
646 | (src_flags & dst_flags_mask) != dst_flags_mask) { |
647 | mutex_unlock(&src_area->lock); |
647 | mutex_unlock(&src_area->lock); |
648 | mutex_unlock(&src_as->lock); |
648 | mutex_unlock(&src_as->lock); |
649 | interrupts_restore(ipl); |
649 | interrupts_restore(ipl); |
650 | return EPERM; |
650 | return EPERM; |
651 | } |
651 | } |
652 | 652 | ||
653 | #ifdef CONFIG_VIRT_IDX_DCACHE |
653 | #ifdef CONFIG_VIRT_IDX_DCACHE |
654 | if (!(dst_flags_mask & AS_AREA_EXEC)) { |
654 | if (!(dst_flags_mask & AS_AREA_EXEC)) { |
655 | if (PAGE_COLOR(src_area->base) != PAGE_COLOR(dst_base)) { |
655 | if (PAGE_COLOR(src_area->base) != PAGE_COLOR(dst_base)) { |
656 | /* |
656 | /* |
657 | * Refuse to create an illegal address alias. |
657 | * Refuse to create an illegal address alias. |
658 | */ |
658 | */ |
659 | mutex_unlock(&src_area->lock); |
659 | mutex_unlock(&src_area->lock); |
660 | mutex_unlock(&src_as->lock); |
660 | mutex_unlock(&src_as->lock); |
661 | interrupts_restore(ipl); |
661 | interrupts_restore(ipl); |
662 | return ENOTSUP; |
662 | return ENOTSUP; |
663 | } |
663 | } |
664 | } |
664 | } |
665 | #endif /* CONFIG_VIRT_IDX_DCACHE */ |
665 | #endif /* CONFIG_VIRT_IDX_DCACHE */ |
666 | 666 | ||
667 | /* |
667 | /* |
668 | * Now we are committed to sharing the area. |
668 | * Now we are committed to sharing the area. |
669 | * First, prepare the area for sharing. |
669 | * First, prepare the area for sharing. |
670 | * Then it will be safe to unlock it. |
670 | * Then it will be safe to unlock it. |
671 | */ |
671 | */ |
672 | sh_info = src_area->sh_info; |
672 | sh_info = src_area->sh_info; |
673 | if (!sh_info) { |
673 | if (!sh_info) { |
674 | sh_info = (share_info_t *) malloc(sizeof(share_info_t), 0); |
674 | sh_info = (share_info_t *) malloc(sizeof(share_info_t), 0); |
675 | mutex_initialize(&sh_info->lock); |
675 | mutex_initialize(&sh_info->lock); |
676 | sh_info->refcount = 2; |
676 | sh_info->refcount = 2; |
677 | btree_create(&sh_info->pagemap); |
677 | btree_create(&sh_info->pagemap); |
678 | src_area->sh_info = sh_info; |
678 | src_area->sh_info = sh_info; |
679 | } else { |
679 | } else { |
680 | mutex_lock(&sh_info->lock); |
680 | mutex_lock(&sh_info->lock); |
681 | sh_info->refcount++; |
681 | sh_info->refcount++; |
682 | mutex_unlock(&sh_info->lock); |
682 | mutex_unlock(&sh_info->lock); |
683 | } |
683 | } |
684 | 684 | ||
685 | src_area->backend->share(src_area); |
685 | src_area->backend->share(src_area); |
686 | 686 | ||
687 | mutex_unlock(&src_area->lock); |
687 | mutex_unlock(&src_area->lock); |
688 | mutex_unlock(&src_as->lock); |
688 | mutex_unlock(&src_as->lock); |
689 | 689 | ||
690 | /* |
690 | /* |
691 | * Create copy of the source address space area. |
691 | * Create copy of the source address space area. |
692 | * The destination area is created with AS_AREA_ATTR_PARTIAL |
692 | * The destination area is created with AS_AREA_ATTR_PARTIAL |
693 | * attribute set which prevents race condition with |
693 | * attribute set which prevents race condition with |
694 | * preliminary as_page_fault() calls. |
694 | * preliminary as_page_fault() calls. |
695 | * The flags of the source area are masked against dst_flags_mask |
695 | * The flags of the source area are masked against dst_flags_mask |
696 | * to support sharing in less privileged mode. |
696 | * to support sharing in less privileged mode. |
697 | */ |
697 | */ |
698 | dst_area = as_area_create(dst_as, dst_flags_mask, src_size, dst_base, |
698 | dst_area = as_area_create(dst_as, dst_flags_mask, src_size, dst_base, |
699 | AS_AREA_ATTR_PARTIAL, src_backend, &src_backend_data); |
699 | AS_AREA_ATTR_PARTIAL, src_backend, &src_backend_data); |
700 | if (!dst_area) { |
700 | if (!dst_area) { |
701 | /* |
701 | /* |
702 | * Destination address space area could not be created. |
702 | * Destination address space area could not be created. |
703 | */ |
703 | */ |
704 | sh_info_remove_reference(sh_info); |
704 | sh_info_remove_reference(sh_info); |
705 | 705 | ||
706 | interrupts_restore(ipl); |
706 | interrupts_restore(ipl); |
707 | return ENOMEM; |
707 | return ENOMEM; |
708 | } |
708 | } |
709 | 709 | ||
710 | /* |
710 | /* |
711 | * Now the destination address space area has been |
711 | * Now the destination address space area has been |
712 | * fully initialized. Clear the AS_AREA_ATTR_PARTIAL |
712 | * fully initialized. Clear the AS_AREA_ATTR_PARTIAL |
713 | * attribute and set the sh_info. |
713 | * attribute and set the sh_info. |
714 | */ |
714 | */ |
715 | mutex_lock(&dst_as->lock); |
715 | mutex_lock(&dst_as->lock); |
716 | mutex_lock(&dst_area->lock); |
716 | mutex_lock(&dst_area->lock); |
717 | dst_area->attributes &= ~AS_AREA_ATTR_PARTIAL; |
717 | dst_area->attributes &= ~AS_AREA_ATTR_PARTIAL; |
718 | dst_area->sh_info = sh_info; |
718 | dst_area->sh_info = sh_info; |
719 | mutex_unlock(&dst_area->lock); |
719 | mutex_unlock(&dst_area->lock); |
720 | mutex_unlock(&dst_as->lock); |
720 | mutex_unlock(&dst_as->lock); |
721 | 721 | ||
722 | interrupts_restore(ipl); |
722 | interrupts_restore(ipl); |
723 | 723 | ||
724 | return 0; |
724 | return 0; |
725 | } |
725 | } |
726 | 726 | ||
727 | /** Check access mode for address space area. |
727 | /** Check access mode for address space area. |
728 | * |
728 | * |
729 | * The address space area must be locked prior to this call. |
729 | * The address space area must be locked prior to this call. |
730 | * |
730 | * |
731 | * @param area Address space area. |
731 | * @param area Address space area. |
732 | * @param access Access mode. |
732 | * @param access Access mode. |
733 | * |
733 | * |
734 | * @return False if access violates area's permissions, true otherwise. |
734 | * @return False if access violates area's permissions, true otherwise. |
735 | */ |
735 | */ |
736 | bool as_area_check_access(as_area_t *area, pf_access_t access) |
736 | bool as_area_check_access(as_area_t *area, pf_access_t access) |
737 | { |
737 | { |
738 | int flagmap[] = { |
738 | int flagmap[] = { |
739 | [PF_ACCESS_READ] = AS_AREA_READ, |
739 | [PF_ACCESS_READ] = AS_AREA_READ, |
740 | [PF_ACCESS_WRITE] = AS_AREA_WRITE, |
740 | [PF_ACCESS_WRITE] = AS_AREA_WRITE, |
741 | [PF_ACCESS_EXEC] = AS_AREA_EXEC |
741 | [PF_ACCESS_EXEC] = AS_AREA_EXEC |
742 | }; |
742 | }; |
743 | 743 | ||
744 | if (!(area->flags & flagmap[access])) |
744 | if (!(area->flags & flagmap[access])) |
745 | return false; |
745 | return false; |
746 | 746 | ||
747 | return true; |
747 | return true; |
748 | } |
748 | } |
749 | 749 | ||
750 | /** Handle page fault within the current address space. |
750 | /** Handle page fault within the current address space. |
751 | * |
751 | * |
752 | * This is the high-level page fault handler. It decides |
752 | * This is the high-level page fault handler. It decides |
753 | * whether the page fault can be resolved by any backend |
753 | * whether the page fault can be resolved by any backend |
754 | * and if so, it invokes the backend to resolve the page |
754 | * and if so, it invokes the backend to resolve the page |
755 | * fault. |
755 | * fault. |
756 | * |
756 | * |
757 | * Interrupts are assumed disabled. |
757 | * Interrupts are assumed disabled. |
758 | * |
758 | * |
759 | * @param page Faulting page. |
759 | * @param page Faulting page. |
760 | * @param access Access mode that caused the fault (i.e. read/write/exec). |
760 | * @param access Access mode that caused the fault (i.e. read/write/exec). |
761 | * @param istate Pointer to interrupted state. |
761 | * @param istate Pointer to interrupted state. |
762 | * |
762 | * |
763 | * @return AS_PF_FAULT on page fault, AS_PF_OK on success or AS_PF_DEFER if the |
763 | * @return AS_PF_FAULT on page fault, AS_PF_OK on success or AS_PF_DEFER if the |
764 | * fault was caused by copy_to_uspace() or copy_from_uspace(). |
764 | * fault was caused by copy_to_uspace() or copy_from_uspace(). |
765 | */ |
765 | */ |
766 | int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate) |
766 | int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate) |
767 | { |
767 | { |
768 | pte_t *pte; |
768 | pte_t *pte; |
769 | as_area_t *area; |
769 | as_area_t *area; |
770 | 770 | ||
771 | if (!THREAD) |
771 | if (!THREAD) |
772 | return AS_PF_FAULT; |
772 | return AS_PF_FAULT; |
773 | 773 | ||
774 | ASSERT(AS); |
774 | ASSERT(AS); |
775 | 775 | ||
776 | mutex_lock(&AS->lock); |
776 | mutex_lock(&AS->lock); |
777 | area = find_area_and_lock(AS, page); |
777 | area = find_area_and_lock(AS, page); |
778 | if (!area) { |
778 | if (!area) { |
779 | /* |
779 | /* |
780 | * No area contained mapping for 'page'. |
780 | * No area contained mapping for 'page'. |
781 | * Signal page fault to low-level handler. |
781 | * Signal page fault to low-level handler. |
782 | */ |
782 | */ |
783 | mutex_unlock(&AS->lock); |
783 | mutex_unlock(&AS->lock); |
784 | goto page_fault; |
784 | goto page_fault; |
785 | } |
785 | } |
786 | 786 | ||
787 | if (area->attributes & AS_AREA_ATTR_PARTIAL) { |
787 | if (area->attributes & AS_AREA_ATTR_PARTIAL) { |
788 | /* |
788 | /* |
789 | * The address space area is not fully initialized. |
789 | * The address space area is not fully initialized. |
790 | * Avoid possible race by returning error. |
790 | * Avoid possible race by returning error. |
791 | */ |
791 | */ |
792 | mutex_unlock(&area->lock); |
792 | mutex_unlock(&area->lock); |
793 | mutex_unlock(&AS->lock); |
793 | mutex_unlock(&AS->lock); |
794 | goto page_fault; |
794 | goto page_fault; |
795 | } |
795 | } |
796 | 796 | ||
797 | if (!area->backend || !area->backend->page_fault) { |
797 | if (!area->backend || !area->backend->page_fault) { |
798 | /* |
798 | /* |
799 | * The address space area is not backed by any backend |
799 | * The address space area is not backed by any backend |
800 | * or the backend cannot handle page faults. |
800 | * or the backend cannot handle page faults. |
801 | */ |
801 | */ |
802 | mutex_unlock(&area->lock); |
802 | mutex_unlock(&area->lock); |
803 | mutex_unlock(&AS->lock); |
803 | mutex_unlock(&AS->lock); |
804 | goto page_fault; |
804 | goto page_fault; |
805 | } |
805 | } |
806 | 806 | ||
807 | page_table_lock(AS, false); |
807 | page_table_lock(AS, false); |
808 | 808 | ||
809 | /* |
809 | /* |
810 | * To avoid race condition between two page faults |
810 | * To avoid race condition between two page faults |
811 | * on the same address, we need to make sure |
811 | * on the same address, we need to make sure |
812 | * the mapping has not been already inserted. |
812 | * the mapping has not been already inserted. |
813 | */ |
813 | */ |
814 | if ((pte = page_mapping_find(AS, page))) { |
814 | if ((pte = page_mapping_find(AS, page))) { |
815 | if (PTE_PRESENT(pte)) { |
815 | if (PTE_PRESENT(pte)) { |
816 | if (((access == PF_ACCESS_READ) && PTE_READABLE(pte)) || |
816 | if (((access == PF_ACCESS_READ) && PTE_READABLE(pte)) || |
817 | (access == PF_ACCESS_WRITE && PTE_WRITABLE(pte)) || |
817 | (access == PF_ACCESS_WRITE && PTE_WRITABLE(pte)) || |
818 | (access == PF_ACCESS_EXEC && PTE_EXECUTABLE(pte))) { |
818 | (access == PF_ACCESS_EXEC && PTE_EXECUTABLE(pte))) { |
819 | page_table_unlock(AS, false); |
819 | page_table_unlock(AS, false); |
820 | mutex_unlock(&area->lock); |
820 | mutex_unlock(&area->lock); |
821 | mutex_unlock(&AS->lock); |
821 | mutex_unlock(&AS->lock); |
822 | return AS_PF_OK; |
822 | return AS_PF_OK; |
823 | } |
823 | } |
824 | } |
824 | } |
825 | } |
825 | } |
826 | 826 | ||
827 | /* |
827 | /* |
828 | * Resort to the backend page fault handler. |
828 | * Resort to the backend page fault handler. |
829 | */ |
829 | */ |
830 | if (area->backend->page_fault(area, page, access) != AS_PF_OK) { |
830 | if (area->backend->page_fault(area, page, access) != AS_PF_OK) { |
831 | page_table_unlock(AS, false); |
831 | page_table_unlock(AS, false); |
832 | mutex_unlock(&area->lock); |
832 | mutex_unlock(&area->lock); |
833 | mutex_unlock(&AS->lock); |
833 | mutex_unlock(&AS->lock); |
834 | goto page_fault; |
834 | goto page_fault; |
835 | } |
835 | } |
836 | 836 | ||
837 | page_table_unlock(AS, false); |
837 | page_table_unlock(AS, false); |
838 | mutex_unlock(&area->lock); |
838 | mutex_unlock(&area->lock); |
839 | mutex_unlock(&AS->lock); |
839 | mutex_unlock(&AS->lock); |
840 | return AS_PF_OK; |
840 | return AS_PF_OK; |
841 | 841 | ||
842 | page_fault: |
842 | page_fault: |
843 | if (THREAD->in_copy_from_uspace) { |
843 | if (THREAD->in_copy_from_uspace) { |
844 | THREAD->in_copy_from_uspace = false; |
844 | THREAD->in_copy_from_uspace = false; |
845 | istate_set_retaddr(istate, |
845 | istate_set_retaddr(istate, |
846 | (uintptr_t) &memcpy_from_uspace_failover_address); |
846 | (uintptr_t) &memcpy_from_uspace_failover_address); |
847 | } else if (THREAD->in_copy_to_uspace) { |
847 | } else if (THREAD->in_copy_to_uspace) { |
848 | THREAD->in_copy_to_uspace = false; |
848 | THREAD->in_copy_to_uspace = false; |
849 | istate_set_retaddr(istate, |
849 | istate_set_retaddr(istate, |
850 | (uintptr_t) &memcpy_to_uspace_failover_address); |
850 | (uintptr_t) &memcpy_to_uspace_failover_address); |
851 | } else { |
851 | } else { |
852 | return AS_PF_FAULT; |
852 | return AS_PF_FAULT; |
853 | } |
853 | } |
854 | 854 | ||
855 | return AS_PF_DEFER; |
855 | return AS_PF_DEFER; |
856 | } |
856 | } |
857 | 857 | ||
858 | /** Switch address spaces. |
858 | /** Switch address spaces. |
859 | * |
859 | * |
860 | * Note that this function cannot sleep as it is essentially a part of |
860 | * Note that this function cannot sleep as it is essentially a part of |
861 | * scheduling. Sleeping here would lead to deadlock on wakeup. |
861 | * scheduling. Sleeping here would lead to deadlock on wakeup. |
862 | * |
862 | * |
863 | * @param old Old address space or NULL. |
863 | * @param old Old address space or NULL. |
864 | * @param new New address space. |
864 | * @param new New address space. |
865 | */ |
865 | */ |
866 | void as_switch(as_t *old, as_t *new) |
866 | void as_switch(as_t *old, as_t *replace) |
867 | { |
867 | { |
868 | ipl_t ipl; |
868 | ipl_t ipl; |
869 | bool needs_asid = false; |
869 | bool needs_asid = false; |
870 | 870 | ||
871 | ipl = interrupts_disable(); |
871 | ipl = interrupts_disable(); |
872 | spinlock_lock(&inactive_as_with_asid_lock); |
872 | spinlock_lock(&inactive_as_with_asid_lock); |
873 | 873 | ||
874 | /* |
874 | /* |
875 | * First, take care of the old address space. |
875 | * First, take care of the old address space. |
876 | */ |
876 | */ |
877 | if (old) { |
877 | if (old) { |
878 | mutex_lock_active(&old->lock); |
878 | mutex_lock_active(&old->lock); |
879 | ASSERT(old->cpu_refcount); |
879 | ASSERT(old->cpu_refcount); |
880 | if((--old->cpu_refcount == 0) && (old != AS_KERNEL)) { |
880 | if((--old->cpu_refcount == 0) && (old != AS_KERNEL)) { |
881 | /* |
881 | /* |
882 | * The old address space is no longer active on |
882 | * The old address space is no longer active on |
883 | * any processor. It can be appended to the |
883 | * any processor. It can be appended to the |
884 | * list of inactive address spaces with assigned |
884 | * list of inactive address spaces with assigned |
885 | * ASID. |
885 | * ASID. |
886 | */ |
886 | */ |
887 | ASSERT(old->asid != ASID_INVALID); |
887 | ASSERT(old->asid != ASID_INVALID); |
888 | list_append(&old->inactive_as_with_asid_link, |
888 | list_append(&old->inactive_as_with_asid_link, |
889 | &inactive_as_with_asid_head); |
889 | &inactive_as_with_asid_head); |
890 | } |
890 | } |
891 | mutex_unlock(&old->lock); |
891 | mutex_unlock(&old->lock); |
892 | 892 | ||
893 | /* |
893 | /* |
894 | * Perform architecture-specific tasks when the address space |
894 | * Perform architecture-specific tasks when the address space |
895 | * is being removed from the CPU. |
895 | * is being removed from the CPU. |
896 | */ |
896 | */ |
897 | as_deinstall_arch(old); |
897 | as_deinstall_arch(old); |
898 | } |
898 | } |
899 | 899 | ||
900 | /* |
900 | /* |
901 | * Second, prepare the new address space. |
901 | * Second, prepare the new address space. |
902 | */ |
902 | */ |
903 | mutex_lock_active(&new->lock); |
903 | mutex_lock_active(&replace->lock); |
904 | if ((new->cpu_refcount++ == 0) && (new != AS_KERNEL)) { |
904 | if ((replace->cpu_refcount++ == 0) && (replace != AS_KERNEL)) { |
905 | if (new->asid != ASID_INVALID) { |
905 | if (replace->asid != ASID_INVALID) { |
906 | list_remove(&new->inactive_as_with_asid_link); |
906 | list_remove(&replace->inactive_as_with_asid_link); |
907 | } else { |
907 | } else { |
908 | /* |
908 | /* |
909 | * Defer call to asid_get() until new->lock is released. |
909 | * Defer call to asid_get() until replace->lock is released. |
910 | */ |
910 | */ |
911 | needs_asid = true; |
911 | needs_asid = true; |
912 | } |
912 | } |
913 | } |
913 | } |
914 | SET_PTL0_ADDRESS(new->page_table); |
914 | SET_PTL0_ADDRESS(replace->page_table); |
915 | mutex_unlock(&new->lock); |
915 | mutex_unlock(&replace->lock); |
916 | 916 | ||
917 | if (needs_asid) { |
917 | if (needs_asid) { |
918 | /* |
918 | /* |
919 | * Allocation of new ASID was deferred |
919 | * Allocation of new ASID was deferred |
920 | * until now in order to avoid deadlock. |
920 | * until now in order to avoid deadlock. |
921 | */ |
921 | */ |
922 | asid_t asid; |
922 | asid_t asid; |
923 | 923 | ||
924 | asid = asid_get(); |
924 | asid = asid_get(); |
925 | mutex_lock_active(&new->lock); |
925 | mutex_lock_active(&replace->lock); |
926 | new->asid = asid; |
926 | replace->asid = asid; |
927 | mutex_unlock(&new->lock); |
927 | mutex_unlock(&replace->lock); |
928 | } |
928 | } |
929 | spinlock_unlock(&inactive_as_with_asid_lock); |
929 | spinlock_unlock(&inactive_as_with_asid_lock); |
930 | interrupts_restore(ipl); |
930 | interrupts_restore(ipl); |
931 | 931 | ||
932 | /* |
932 | /* |
933 | * Perform architecture-specific steps. |
933 | * Perform architecture-specific steps. |
934 | * (e.g. write ASID to hardware register etc.) |
934 | * (e.g. write ASID to hardware register etc.) |
935 | */ |
935 | */ |
936 | as_install_arch(new); |
936 | as_install_arch(replace); |
937 | 937 | ||
938 | AS = new; |
938 | AS = replace; |
939 | } |
939 | } |
940 | 940 | ||
941 | /** Convert address space area flags to page flags. |
941 | /** Convert address space area flags to page flags. |
942 | * |
942 | * |
943 | * @param aflags Flags of some address space area. |
943 | * @param aflags Flags of some address space area. |
944 | * |
944 | * |
945 | * @return Flags to be passed to page_mapping_insert(). |
945 | * @return Flags to be passed to page_mapping_insert(). |
946 | */ |
946 | */ |
947 | int area_flags_to_page_flags(int aflags) |
947 | int area_flags_to_page_flags(int aflags) |
948 | { |
948 | { |
949 | int flags; |
949 | int flags; |
950 | 950 | ||
951 | flags = PAGE_USER | PAGE_PRESENT; |
951 | flags = PAGE_USER | PAGE_PRESENT; |
952 | 952 | ||
953 | if (aflags & AS_AREA_READ) |
953 | if (aflags & AS_AREA_READ) |
954 | flags |= PAGE_READ; |
954 | flags |= PAGE_READ; |
955 | 955 | ||
956 | if (aflags & AS_AREA_WRITE) |
956 | if (aflags & AS_AREA_WRITE) |
957 | flags |= PAGE_WRITE; |
957 | flags |= PAGE_WRITE; |
958 | 958 | ||
959 | if (aflags & AS_AREA_EXEC) |
959 | if (aflags & AS_AREA_EXEC) |
960 | flags |= PAGE_EXEC; |
960 | flags |= PAGE_EXEC; |
961 | 961 | ||
962 | if (aflags & AS_AREA_CACHEABLE) |
962 | if (aflags & AS_AREA_CACHEABLE) |
963 | flags |= PAGE_CACHEABLE; |
963 | flags |= PAGE_CACHEABLE; |
964 | 964 | ||
965 | return flags; |
965 | return flags; |
966 | } |
966 | } |
967 | 967 | ||
968 | /** Compute flags for virtual address translation subsytem. |
968 | /** Compute flags for virtual address translation subsytem. |
969 | * |
969 | * |
970 | * The address space area must be locked. |
970 | * The address space area must be locked. |
971 | * Interrupts must be disabled. |
971 | * Interrupts must be disabled. |
972 | * |
972 | * |
973 | * @param a Address space area. |
973 | * @param a Address space area. |
974 | * |
974 | * |
975 | * @return Flags to be used in page_mapping_insert(). |
975 | * @return Flags to be used in page_mapping_insert(). |
976 | */ |
976 | */ |
977 | int as_area_get_flags(as_area_t *a) |
977 | int as_area_get_flags(as_area_t *a) |
978 | { |
978 | { |
979 | return area_flags_to_page_flags(a->flags); |
979 | return area_flags_to_page_flags(a->flags); |
980 | } |
980 | } |
981 | 981 | ||
982 | /** Create page table. |
982 | /** Create page table. |
983 | * |
983 | * |
984 | * Depending on architecture, create either address space |
984 | * Depending on architecture, create either address space |
985 | * private or global page table. |
985 | * private or global page table. |
986 | * |
986 | * |
987 | * @param flags Flags saying whether the page table is for kernel address space. |
987 | * @param flags Flags saying whether the page table is for kernel address space. |
988 | * |
988 | * |
989 | * @return First entry of the page table. |
989 | * @return First entry of the page table. |
990 | */ |
990 | */ |
991 | pte_t *page_table_create(int flags) |
991 | pte_t *page_table_create(int flags) |
992 | { |
992 | { |
993 | ASSERT(as_operations); |
993 | ASSERT(as_operations); |
994 | ASSERT(as_operations->page_table_create); |
994 | ASSERT(as_operations->page_table_create); |
995 | 995 | ||
996 | return as_operations->page_table_create(flags); |
996 | return as_operations->page_table_create(flags); |
997 | } |
997 | } |
998 | 998 | ||
999 | /** Destroy page table. |
999 | /** Destroy page table. |
1000 | * |
1000 | * |
1001 | * Destroy page table in architecture specific way. |
1001 | * Destroy page table in architecture specific way. |
1002 | * |
1002 | * |
1003 | * @param page_table Physical address of PTL0. |
1003 | * @param page_table Physical address of PTL0. |
1004 | */ |
1004 | */ |
1005 | void page_table_destroy(pte_t *page_table) |
1005 | void page_table_destroy(pte_t *page_table) |
1006 | { |
1006 | { |
1007 | ASSERT(as_operations); |
1007 | ASSERT(as_operations); |
1008 | ASSERT(as_operations->page_table_destroy); |
1008 | ASSERT(as_operations->page_table_destroy); |
1009 | 1009 | ||
1010 | as_operations->page_table_destroy(page_table); |
1010 | as_operations->page_table_destroy(page_table); |
1011 | } |
1011 | } |
1012 | 1012 | ||
1013 | /** Lock page table. |
1013 | /** Lock page table. |
1014 | * |
1014 | * |
1015 | * This function should be called before any page_mapping_insert(), |
1015 | * This function should be called before any page_mapping_insert(), |
1016 | * page_mapping_remove() and page_mapping_find(). |
1016 | * page_mapping_remove() and page_mapping_find(). |
1017 | * |
1017 | * |
1018 | * Locking order is such that address space areas must be locked |
1018 | * Locking order is such that address space areas must be locked |
1019 | * prior to this call. Address space can be locked prior to this |
1019 | * prior to this call. Address space can be locked prior to this |
1020 | * call in which case the lock argument is false. |
1020 | * call in which case the lock argument is false. |
1021 | * |
1021 | * |
1022 | * @param as Address space. |
1022 | * @param as Address space. |
1023 | * @param lock If false, do not attempt to lock as->lock. |
1023 | * @param lock If false, do not attempt to lock as->lock. |
1024 | */ |
1024 | */ |
1025 | void page_table_lock(as_t *as, bool lock) |
1025 | void page_table_lock(as_t *as, bool lock) |
1026 | { |
1026 | { |
1027 | ASSERT(as_operations); |
1027 | ASSERT(as_operations); |
1028 | ASSERT(as_operations->page_table_lock); |
1028 | ASSERT(as_operations->page_table_lock); |
1029 | 1029 | ||
1030 | as_operations->page_table_lock(as, lock); |
1030 | as_operations->page_table_lock(as, lock); |
1031 | } |
1031 | } |
1032 | 1032 | ||
1033 | /** Unlock page table. |
1033 | /** Unlock page table. |
1034 | * |
1034 | * |
1035 | * @param as Address space. |
1035 | * @param as Address space. |
1036 | * @param unlock If false, do not attempt to unlock as->lock. |
1036 | * @param unlock If false, do not attempt to unlock as->lock. |
1037 | */ |
1037 | */ |
1038 | void page_table_unlock(as_t *as, bool unlock) |
1038 | void page_table_unlock(as_t *as, bool unlock) |
1039 | { |
1039 | { |
1040 | ASSERT(as_operations); |
1040 | ASSERT(as_operations); |
1041 | ASSERT(as_operations->page_table_unlock); |
1041 | ASSERT(as_operations->page_table_unlock); |
1042 | 1042 | ||
1043 | as_operations->page_table_unlock(as, unlock); |
1043 | as_operations->page_table_unlock(as, unlock); |
1044 | } |
1044 | } |
1045 | 1045 | ||
1046 | 1046 | ||
1047 | /** Find address space area and lock it. |
1047 | /** Find address space area and lock it. |
1048 | * |
1048 | * |
1049 | * The address space must be locked and interrupts must be disabled. |
1049 | * The address space must be locked and interrupts must be disabled. |
1050 | * |
1050 | * |
1051 | * @param as Address space. |
1051 | * @param as Address space. |
1052 | * @param va Virtual address. |
1052 | * @param va Virtual address. |
1053 | * |
1053 | * |
1054 | * @return Locked address space area containing va on success or NULL on |
1054 | * @return Locked address space area containing va on success or NULL on |
1055 | * failure. |
1055 | * failure. |
1056 | */ |
1056 | */ |
1057 | as_area_t *find_area_and_lock(as_t *as, uintptr_t va) |
1057 | as_area_t *find_area_and_lock(as_t *as, uintptr_t va) |
1058 | { |
1058 | { |
1059 | as_area_t *a; |
1059 | as_area_t *a; |
1060 | btree_node_t *leaf, *lnode; |
1060 | btree_node_t *leaf, *lnode; |
1061 | int i; |
1061 | int i; |
1062 | 1062 | ||
1063 | a = (as_area_t *) btree_search(&as->as_area_btree, va, &leaf); |
1063 | a = (as_area_t *) btree_search(&as->as_area_btree, va, &leaf); |
1064 | if (a) { |
1064 | if (a) { |
1065 | /* va is the base address of an address space area */ |
1065 | /* va is the base address of an address space area */ |
1066 | mutex_lock(&a->lock); |
1066 | mutex_lock(&a->lock); |
1067 | return a; |
1067 | return a; |
1068 | } |
1068 | } |
1069 | 1069 | ||
1070 | /* |
1070 | /* |
1071 | * Search the leaf node and the righmost record of its left neighbour |
1071 | * Search the leaf node and the righmost record of its left neighbour |
1072 | * to find out whether this is a miss or va belongs to an address |
1072 | * to find out whether this is a miss or va belongs to an address |
1073 | * space area found there. |
1073 | * space area found there. |
1074 | */ |
1074 | */ |
1075 | 1075 | ||
1076 | /* First, search the leaf node itself. */ |
1076 | /* First, search the leaf node itself. */ |
1077 | for (i = 0; i < leaf->keys; i++) { |
1077 | for (i = 0; i < leaf->keys; i++) { |
1078 | a = (as_area_t *) leaf->value[i]; |
1078 | a = (as_area_t *) leaf->value[i]; |
1079 | mutex_lock(&a->lock); |
1079 | mutex_lock(&a->lock); |
1080 | if ((a->base <= va) && (va < a->base + a->pages * PAGE_SIZE)) { |
1080 | if ((a->base <= va) && (va < a->base + a->pages * PAGE_SIZE)) { |
1081 | return a; |
1081 | return a; |
1082 | } |
1082 | } |
1083 | mutex_unlock(&a->lock); |
1083 | mutex_unlock(&a->lock); |
1084 | } |
1084 | } |
1085 | 1085 | ||
1086 | /* |
1086 | /* |
1087 | * Second, locate the left neighbour and test its last record. |
1087 | * Second, locate the left neighbour and test its last record. |
1088 | * Because of its position in the B+tree, it must have base < va. |
1088 | * Because of its position in the B+tree, it must have base < va. |
1089 | */ |
1089 | */ |
1090 | lnode = btree_leaf_node_left_neighbour(&as->as_area_btree, leaf); |
1090 | lnode = btree_leaf_node_left_neighbour(&as->as_area_btree, leaf); |
1091 | if (lnode) { |
1091 | if (lnode) { |
1092 | a = (as_area_t *) lnode->value[lnode->keys - 1]; |
1092 | a = (as_area_t *) lnode->value[lnode->keys - 1]; |
1093 | mutex_lock(&a->lock); |
1093 | mutex_lock(&a->lock); |
1094 | if (va < a->base + a->pages * PAGE_SIZE) { |
1094 | if (va < a->base + a->pages * PAGE_SIZE) { |
1095 | return a; |
1095 | return a; |
1096 | } |
1096 | } |
1097 | mutex_unlock(&a->lock); |
1097 | mutex_unlock(&a->lock); |
1098 | } |
1098 | } |
1099 | 1099 | ||
1100 | return NULL; |
1100 | return NULL; |
1101 | } |
1101 | } |
1102 | 1102 | ||
1103 | /** Check area conflicts with other areas. |
1103 | /** Check area conflicts with other areas. |
1104 | * |
1104 | * |
1105 | * The address space must be locked and interrupts must be disabled. |
1105 | * The address space must be locked and interrupts must be disabled. |
1106 | * |
1106 | * |
1107 | * @param as Address space. |
1107 | * @param as Address space. |
1108 | * @param va Starting virtual address of the area being tested. |
1108 | * @param va Starting virtual address of the area being tested. |
1109 | * @param size Size of the area being tested. |
1109 | * @param size Size of the area being tested. |
1110 | * @param avoid_area Do not touch this area. |
1110 | * @param avoid_area Do not touch this area. |
1111 | * |
1111 | * |
1112 | * @return True if there is no conflict, false otherwise. |
1112 | * @return True if there is no conflict, false otherwise. |
1113 | */ |
1113 | */ |
1114 | bool check_area_conflicts(as_t *as, uintptr_t va, size_t size, |
1114 | bool check_area_conflicts(as_t *as, uintptr_t va, size_t size, |
1115 | as_area_t *avoid_area) |
1115 | as_area_t *avoid_area) |
1116 | { |
1116 | { |
1117 | as_area_t *a; |
1117 | as_area_t *a; |
1118 | btree_node_t *leaf, *node; |
1118 | btree_node_t *leaf, *node; |
1119 | int i; |
1119 | int i; |
1120 | 1120 | ||
1121 | /* |
1121 | /* |
1122 | * We don't want any area to have conflicts with NULL page. |
1122 | * We don't want any area to have conflicts with NULL page. |
1123 | */ |
1123 | */ |
1124 | if (overlaps(va, size, NULL, PAGE_SIZE)) |
1124 | if (overlaps(va, size, NULL, PAGE_SIZE)) |
1125 | return false; |
1125 | return false; |
1126 | 1126 | ||
1127 | /* |
1127 | /* |
1128 | * The leaf node is found in O(log n), where n is proportional to |
1128 | * The leaf node is found in O(log n), where n is proportional to |
1129 | * the number of address space areas belonging to as. |
1129 | * the number of address space areas belonging to as. |
1130 | * The check for conflicts is then attempted on the rightmost |
1130 | * The check for conflicts is then attempted on the rightmost |
1131 | * record in the left neighbour, the leftmost record in the right |
1131 | * record in the left neighbour, the leftmost record in the right |
1132 | * neighbour and all records in the leaf node itself. |
1132 | * neighbour and all records in the leaf node itself. |
1133 | */ |
1133 | */ |
1134 | 1134 | ||
1135 | if ((a = (as_area_t *) btree_search(&as->as_area_btree, va, &leaf))) { |
1135 | if ((a = (as_area_t *) btree_search(&as->as_area_btree, va, &leaf))) { |
1136 | if (a != avoid_area) |
1136 | if (a != avoid_area) |
1137 | return false; |
1137 | return false; |
1138 | } |
1138 | } |
1139 | 1139 | ||
1140 | /* First, check the two border cases. */ |
1140 | /* First, check the two border cases. */ |
1141 | if ((node = btree_leaf_node_left_neighbour(&as->as_area_btree, leaf))) { |
1141 | if ((node = btree_leaf_node_left_neighbour(&as->as_area_btree, leaf))) { |
1142 | a = (as_area_t *) node->value[node->keys - 1]; |
1142 | a = (as_area_t *) node->value[node->keys - 1]; |
1143 | mutex_lock(&a->lock); |
1143 | mutex_lock(&a->lock); |
1144 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1144 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1145 | mutex_unlock(&a->lock); |
1145 | mutex_unlock(&a->lock); |
1146 | return false; |
1146 | return false; |
1147 | } |
1147 | } |
1148 | mutex_unlock(&a->lock); |
1148 | mutex_unlock(&a->lock); |
1149 | } |
1149 | } |
1150 | node = btree_leaf_node_right_neighbour(&as->as_area_btree, leaf); |
1150 | node = btree_leaf_node_right_neighbour(&as->as_area_btree, leaf); |
1151 | if (node) { |
1151 | if (node) { |
1152 | a = (as_area_t *) node->value[0]; |
1152 | a = (as_area_t *) node->value[0]; |
1153 | mutex_lock(&a->lock); |
1153 | mutex_lock(&a->lock); |
1154 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1154 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1155 | mutex_unlock(&a->lock); |
1155 | mutex_unlock(&a->lock); |
1156 | return false; |
1156 | return false; |
1157 | } |
1157 | } |
1158 | mutex_unlock(&a->lock); |
1158 | mutex_unlock(&a->lock); |
1159 | } |
1159 | } |
1160 | 1160 | ||
1161 | /* Second, check the leaf node. */ |
1161 | /* Second, check the leaf node. */ |
1162 | for (i = 0; i < leaf->keys; i++) { |
1162 | for (i = 0; i < leaf->keys; i++) { |
1163 | a = (as_area_t *) leaf->value[i]; |
1163 | a = (as_area_t *) leaf->value[i]; |
1164 | 1164 | ||
1165 | if (a == avoid_area) |
1165 | if (a == avoid_area) |
1166 | continue; |
1166 | continue; |
1167 | 1167 | ||
1168 | mutex_lock(&a->lock); |
1168 | mutex_lock(&a->lock); |
1169 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1169 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1170 | mutex_unlock(&a->lock); |
1170 | mutex_unlock(&a->lock); |
1171 | return false; |
1171 | return false; |
1172 | } |
1172 | } |
1173 | mutex_unlock(&a->lock); |
1173 | mutex_unlock(&a->lock); |
1174 | } |
1174 | } |
1175 | 1175 | ||
1176 | /* |
1176 | /* |
1177 | * So far, the area does not conflict with other areas. |
1177 | * So far, the area does not conflict with other areas. |
1178 | * Check if it doesn't conflict with kernel address space. |
1178 | * Check if it doesn't conflict with kernel address space. |
1179 | */ |
1179 | */ |
1180 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
1180 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
1181 | return !overlaps(va, size, |
1181 | return !overlaps(va, size, |
1182 | KERNEL_ADDRESS_SPACE_START, |
1182 | KERNEL_ADDRESS_SPACE_START, |
1183 | KERNEL_ADDRESS_SPACE_END - KERNEL_ADDRESS_SPACE_START); |
1183 | KERNEL_ADDRESS_SPACE_END - KERNEL_ADDRESS_SPACE_START); |
1184 | } |
1184 | } |
1185 | 1185 | ||
1186 | return true; |
1186 | return true; |
1187 | } |
1187 | } |
1188 | 1188 | ||
1189 | /** Return size of the address space area with given base. */ |
1189 | /** Return size of the address space area with given base. */ |
1190 | size_t as_get_size(uintptr_t base) |
1190 | size_t as_get_size(uintptr_t base) |
1191 | { |
1191 | { |
1192 | ipl_t ipl; |
1192 | ipl_t ipl; |
1193 | as_area_t *src_area; |
1193 | as_area_t *src_area; |
1194 | size_t size; |
1194 | size_t size; |
1195 | 1195 | ||
1196 | ipl = interrupts_disable(); |
1196 | ipl = interrupts_disable(); |
1197 | src_area = find_area_and_lock(AS, base); |
1197 | src_area = find_area_and_lock(AS, base); |
1198 | if (src_area){ |
1198 | if (src_area){ |
1199 | size = src_area->pages * PAGE_SIZE; |
1199 | size = src_area->pages * PAGE_SIZE; |
1200 | mutex_unlock(&src_area->lock); |
1200 | mutex_unlock(&src_area->lock); |
1201 | } else { |
1201 | } else { |
1202 | size = 0; |
1202 | size = 0; |
1203 | } |
1203 | } |
1204 | interrupts_restore(ipl); |
1204 | interrupts_restore(ipl); |
1205 | return size; |
1205 | return size; |
1206 | } |
1206 | } |
1207 | 1207 | ||
1208 | /** Mark portion of address space area as used. |
1208 | /** Mark portion of address space area as used. |
1209 | * |
1209 | * |
1210 | * The address space area must be already locked. |
1210 | * The address space area must be already locked. |
1211 | * |
1211 | * |
1212 | * @param a Address space area. |
1212 | * @param a Address space area. |
1213 | * @param page First page to be marked. |
1213 | * @param page First page to be marked. |
1214 | * @param count Number of page to be marked. |
1214 | * @param count Number of page to be marked. |
1215 | * |
1215 | * |
1216 | * @return 0 on failure and 1 on success. |
1216 | * @return 0 on failure and 1 on success. |
1217 | */ |
1217 | */ |
1218 | int used_space_insert(as_area_t *a, uintptr_t page, count_t count) |
1218 | int used_space_insert(as_area_t *a, uintptr_t page, count_t count) |
1219 | { |
1219 | { |
1220 | btree_node_t *leaf, *node; |
1220 | btree_node_t *leaf, *node; |
1221 | count_t pages; |
1221 | count_t pages; |
1222 | int i; |
1222 | int i; |
1223 | 1223 | ||
1224 | ASSERT(page == ALIGN_DOWN(page, PAGE_SIZE)); |
1224 | ASSERT(page == ALIGN_DOWN(page, PAGE_SIZE)); |
1225 | ASSERT(count); |
1225 | ASSERT(count); |
1226 | 1226 | ||
1227 | pages = (count_t) btree_search(&a->used_space, page, &leaf); |
1227 | pages = (count_t) btree_search(&a->used_space, page, &leaf); |
1228 | if (pages) { |
1228 | if (pages) { |
1229 | /* |
1229 | /* |
1230 | * We hit the beginning of some used space. |
1230 | * We hit the beginning of some used space. |
1231 | */ |
1231 | */ |
1232 | return 0; |
1232 | return 0; |
1233 | } |
1233 | } |
1234 | 1234 | ||
1235 | if (!leaf->keys) { |
1235 | if (!leaf->keys) { |
1236 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1236 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1237 | return 1; |
1237 | return 1; |
1238 | } |
1238 | } |
1239 | 1239 | ||
1240 | node = btree_leaf_node_left_neighbour(&a->used_space, leaf); |
1240 | node = btree_leaf_node_left_neighbour(&a->used_space, leaf); |
1241 | if (node) { |
1241 | if (node) { |
1242 | uintptr_t left_pg = node->key[node->keys - 1]; |
1242 | uintptr_t left_pg = node->key[node->keys - 1]; |
1243 | uintptr_t right_pg = leaf->key[0]; |
1243 | uintptr_t right_pg = leaf->key[0]; |
1244 | count_t left_cnt = (count_t) node->value[node->keys - 1]; |
1244 | count_t left_cnt = (count_t) node->value[node->keys - 1]; |
1245 | count_t right_cnt = (count_t) leaf->value[0]; |
1245 | count_t right_cnt = (count_t) leaf->value[0]; |
1246 | 1246 | ||
1247 | /* |
1247 | /* |
1248 | * Examine the possibility that the interval fits |
1248 | * Examine the possibility that the interval fits |
1249 | * somewhere between the rightmost interval of |
1249 | * somewhere between the rightmost interval of |
1250 | * the left neigbour and the first interval of the leaf. |
1250 | * the left neigbour and the first interval of the leaf. |
1251 | */ |
1251 | */ |
1252 | 1252 | ||
1253 | if (page >= right_pg) { |
1253 | if (page >= right_pg) { |
1254 | /* Do nothing. */ |
1254 | /* Do nothing. */ |
1255 | } else if (overlaps(page, count * PAGE_SIZE, left_pg, |
1255 | } else if (overlaps(page, count * PAGE_SIZE, left_pg, |
1256 | left_cnt * PAGE_SIZE)) { |
1256 | left_cnt * PAGE_SIZE)) { |
1257 | /* The interval intersects with the left interval. */ |
1257 | /* The interval intersects with the left interval. */ |
1258 | return 0; |
1258 | return 0; |
1259 | } else if (overlaps(page, count * PAGE_SIZE, right_pg, |
1259 | } else if (overlaps(page, count * PAGE_SIZE, right_pg, |
1260 | right_cnt * PAGE_SIZE)) { |
1260 | right_cnt * PAGE_SIZE)) { |
1261 | /* The interval intersects with the right interval. */ |
1261 | /* The interval intersects with the right interval. */ |
1262 | return 0; |
1262 | return 0; |
1263 | } else if ((page == left_pg + left_cnt * PAGE_SIZE) && |
1263 | } else if ((page == left_pg + left_cnt * PAGE_SIZE) && |
1264 | (page + count * PAGE_SIZE == right_pg)) { |
1264 | (page + count * PAGE_SIZE == right_pg)) { |
1265 | /* |
1265 | /* |
1266 | * The interval can be added by merging the two already |
1266 | * The interval can be added by merging the two already |
1267 | * present intervals. |
1267 | * present intervals. |
1268 | */ |
1268 | */ |
1269 | node->value[node->keys - 1] += count + right_cnt; |
1269 | node->value[node->keys - 1] += count + right_cnt; |
1270 | btree_remove(&a->used_space, right_pg, leaf); |
1270 | btree_remove(&a->used_space, right_pg, leaf); |
1271 | return 1; |
1271 | return 1; |
1272 | } else if (page == left_pg + left_cnt * PAGE_SIZE) { |
1272 | } else if (page == left_pg + left_cnt * PAGE_SIZE) { |
1273 | /* |
1273 | /* |
1274 | * The interval can be added by simply growing the left |
1274 | * The interval can be added by simply growing the left |
1275 | * interval. |
1275 | * interval. |
1276 | */ |
1276 | */ |
1277 | node->value[node->keys - 1] += count; |
1277 | node->value[node->keys - 1] += count; |
1278 | return 1; |
1278 | return 1; |
1279 | } else if (page + count * PAGE_SIZE == right_pg) { |
1279 | } else if (page + count * PAGE_SIZE == right_pg) { |
1280 | /* |
1280 | /* |
1281 | * The interval can be addded by simply moving base of |
1281 | * The interval can be addded by simply moving base of |
1282 | * the right interval down and increasing its size |
1282 | * the right interval down and increasing its size |
1283 | * accordingly. |
1283 | * accordingly. |
1284 | */ |
1284 | */ |
1285 | leaf->value[0] += count; |
1285 | leaf->value[0] += count; |
1286 | leaf->key[0] = page; |
1286 | leaf->key[0] = page; |
1287 | return 1; |
1287 | return 1; |
1288 | } else { |
1288 | } else { |
1289 | /* |
1289 | /* |
1290 | * The interval is between both neigbouring intervals, |
1290 | * The interval is between both neigbouring intervals, |
1291 | * but cannot be merged with any of them. |
1291 | * but cannot be merged with any of them. |
1292 | */ |
1292 | */ |
1293 | btree_insert(&a->used_space, page, (void *) count, |
1293 | btree_insert(&a->used_space, page, (void *) count, |
1294 | leaf); |
1294 | leaf); |
1295 | return 1; |
1295 | return 1; |
1296 | } |
1296 | } |
1297 | } else if (page < leaf->key[0]) { |
1297 | } else if (page < leaf->key[0]) { |
1298 | uintptr_t right_pg = leaf->key[0]; |
1298 | uintptr_t right_pg = leaf->key[0]; |
1299 | count_t right_cnt = (count_t) leaf->value[0]; |
1299 | count_t right_cnt = (count_t) leaf->value[0]; |
1300 | 1300 | ||
1301 | /* |
1301 | /* |
1302 | * Investigate the border case in which the left neighbour does |
1302 | * Investigate the border case in which the left neighbour does |
1303 | * not exist but the interval fits from the left. |
1303 | * not exist but the interval fits from the left. |
1304 | */ |
1304 | */ |
1305 | 1305 | ||
1306 | if (overlaps(page, count * PAGE_SIZE, right_pg, |
1306 | if (overlaps(page, count * PAGE_SIZE, right_pg, |
1307 | right_cnt * PAGE_SIZE)) { |
1307 | right_cnt * PAGE_SIZE)) { |
1308 | /* The interval intersects with the right interval. */ |
1308 | /* The interval intersects with the right interval. */ |
1309 | return 0; |
1309 | return 0; |
1310 | } else if (page + count * PAGE_SIZE == right_pg) { |
1310 | } else if (page + count * PAGE_SIZE == right_pg) { |
1311 | /* |
1311 | /* |
1312 | * The interval can be added by moving the base of the |
1312 | * The interval can be added by moving the base of the |
1313 | * right interval down and increasing its size |
1313 | * right interval down and increasing its size |
1314 | * accordingly. |
1314 | * accordingly. |
1315 | */ |
1315 | */ |
1316 | leaf->key[0] = page; |
1316 | leaf->key[0] = page; |
1317 | leaf->value[0] += count; |
1317 | leaf->value[0] += count; |
1318 | return 1; |
1318 | return 1; |
1319 | } else { |
1319 | } else { |
1320 | /* |
1320 | /* |
1321 | * The interval doesn't adjoin with the right interval. |
1321 | * The interval doesn't adjoin with the right interval. |
1322 | * It must be added individually. |
1322 | * It must be added individually. |
1323 | */ |
1323 | */ |
1324 | btree_insert(&a->used_space, page, (void *) count, |
1324 | btree_insert(&a->used_space, page, (void *) count, |
1325 | leaf); |
1325 | leaf); |
1326 | return 1; |
1326 | return 1; |
1327 | } |
1327 | } |
1328 | } |
1328 | } |
1329 | 1329 | ||
1330 | node = btree_leaf_node_right_neighbour(&a->used_space, leaf); |
1330 | node = btree_leaf_node_right_neighbour(&a->used_space, leaf); |
1331 | if (node) { |
1331 | if (node) { |
1332 | uintptr_t left_pg = leaf->key[leaf->keys - 1]; |
1332 | uintptr_t left_pg = leaf->key[leaf->keys - 1]; |
1333 | uintptr_t right_pg = node->key[0]; |
1333 | uintptr_t right_pg = node->key[0]; |
1334 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1334 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1335 | count_t right_cnt = (count_t) node->value[0]; |
1335 | count_t right_cnt = (count_t) node->value[0]; |
1336 | 1336 | ||
1337 | /* |
1337 | /* |
1338 | * Examine the possibility that the interval fits |
1338 | * Examine the possibility that the interval fits |
1339 | * somewhere between the leftmost interval of |
1339 | * somewhere between the leftmost interval of |
1340 | * the right neigbour and the last interval of the leaf. |
1340 | * the right neigbour and the last interval of the leaf. |
1341 | */ |
1341 | */ |
1342 | 1342 | ||
1343 | if (page < left_pg) { |
1343 | if (page < left_pg) { |
1344 | /* Do nothing. */ |
1344 | /* Do nothing. */ |
1345 | } else if (overlaps(page, count * PAGE_SIZE, left_pg, |
1345 | } else if (overlaps(page, count * PAGE_SIZE, left_pg, |
1346 | left_cnt * PAGE_SIZE)) { |
1346 | left_cnt * PAGE_SIZE)) { |
1347 | /* The interval intersects with the left interval. */ |
1347 | /* The interval intersects with the left interval. */ |
1348 | return 0; |
1348 | return 0; |
1349 | } else if (overlaps(page, count * PAGE_SIZE, right_pg, |
1349 | } else if (overlaps(page, count * PAGE_SIZE, right_pg, |
1350 | right_cnt * PAGE_SIZE)) { |
1350 | right_cnt * PAGE_SIZE)) { |
1351 | /* The interval intersects with the right interval. */ |
1351 | /* The interval intersects with the right interval. */ |
1352 | return 0; |
1352 | return 0; |
1353 | } else if ((page == left_pg + left_cnt * PAGE_SIZE) && |
1353 | } else if ((page == left_pg + left_cnt * PAGE_SIZE) && |
1354 | (page + count * PAGE_SIZE == right_pg)) { |
1354 | (page + count * PAGE_SIZE == right_pg)) { |
1355 | /* |
1355 | /* |
1356 | * The interval can be added by merging the two already |
1356 | * The interval can be added by merging the two already |
1357 | * present intervals. |
1357 | * present intervals. |
1358 | * */ |
1358 | * */ |
1359 | leaf->value[leaf->keys - 1] += count + right_cnt; |
1359 | leaf->value[leaf->keys - 1] += count + right_cnt; |
1360 | btree_remove(&a->used_space, right_pg, node); |
1360 | btree_remove(&a->used_space, right_pg, node); |
1361 | return 1; |
1361 | return 1; |
1362 | } else if (page == left_pg + left_cnt * PAGE_SIZE) { |
1362 | } else if (page == left_pg + left_cnt * PAGE_SIZE) { |
1363 | /* |
1363 | /* |
1364 | * The interval can be added by simply growing the left |
1364 | * The interval can be added by simply growing the left |
1365 | * interval. |
1365 | * interval. |
1366 | * */ |
1366 | * */ |
1367 | leaf->value[leaf->keys - 1] += count; |
1367 | leaf->value[leaf->keys - 1] += count; |
1368 | return 1; |
1368 | return 1; |
1369 | } else if (page + count * PAGE_SIZE == right_pg) { |
1369 | } else if (page + count * PAGE_SIZE == right_pg) { |
1370 | /* |
1370 | /* |
1371 | * The interval can be addded by simply moving base of |
1371 | * The interval can be addded by simply moving base of |
1372 | * the right interval down and increasing its size |
1372 | * the right interval down and increasing its size |
1373 | * accordingly. |
1373 | * accordingly. |
1374 | */ |
1374 | */ |
1375 | node->value[0] += count; |
1375 | node->value[0] += count; |
1376 | node->key[0] = page; |
1376 | node->key[0] = page; |
1377 | return 1; |
1377 | return 1; |
1378 | } else { |
1378 | } else { |
1379 | /* |
1379 | /* |
1380 | * The interval is between both neigbouring intervals, |
1380 | * The interval is between both neigbouring intervals, |
1381 | * but cannot be merged with any of them. |
1381 | * but cannot be merged with any of them. |
1382 | */ |
1382 | */ |
1383 | btree_insert(&a->used_space, page, (void *) count, |
1383 | btree_insert(&a->used_space, page, (void *) count, |
1384 | leaf); |
1384 | leaf); |
1385 | return 1; |
1385 | return 1; |
1386 | } |
1386 | } |
1387 | } else if (page >= leaf->key[leaf->keys - 1]) { |
1387 | } else if (page >= leaf->key[leaf->keys - 1]) { |
1388 | uintptr_t left_pg = leaf->key[leaf->keys - 1]; |
1388 | uintptr_t left_pg = leaf->key[leaf->keys - 1]; |
1389 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1389 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1390 | 1390 | ||
1391 | /* |
1391 | /* |
1392 | * Investigate the border case in which the right neighbour |
1392 | * Investigate the border case in which the right neighbour |
1393 | * does not exist but the interval fits from the right. |
1393 | * does not exist but the interval fits from the right. |
1394 | */ |
1394 | */ |
1395 | 1395 | ||
1396 | if (overlaps(page, count * PAGE_SIZE, left_pg, |
1396 | if (overlaps(page, count * PAGE_SIZE, left_pg, |
1397 | left_cnt * PAGE_SIZE)) { |
1397 | left_cnt * PAGE_SIZE)) { |
1398 | /* The interval intersects with the left interval. */ |
1398 | /* The interval intersects with the left interval. */ |
1399 | return 0; |
1399 | return 0; |
1400 | } else if (left_pg + left_cnt * PAGE_SIZE == page) { |
1400 | } else if (left_pg + left_cnt * PAGE_SIZE == page) { |
1401 | /* |
1401 | /* |
1402 | * The interval can be added by growing the left |
1402 | * The interval can be added by growing the left |
1403 | * interval. |
1403 | * interval. |
1404 | */ |
1404 | */ |
1405 | leaf->value[leaf->keys - 1] += count; |
1405 | leaf->value[leaf->keys - 1] += count; |
1406 | return 1; |
1406 | return 1; |
1407 | } else { |
1407 | } else { |
1408 | /* |
1408 | /* |
1409 | * The interval doesn't adjoin with the left interval. |
1409 | * The interval doesn't adjoin with the left interval. |
1410 | * It must be added individually. |
1410 | * It must be added individually. |
1411 | */ |
1411 | */ |
1412 | btree_insert(&a->used_space, page, (void *) count, |
1412 | btree_insert(&a->used_space, page, (void *) count, |
1413 | leaf); |
1413 | leaf); |
1414 | return 1; |
1414 | return 1; |
1415 | } |
1415 | } |
1416 | } |
1416 | } |
1417 | 1417 | ||
1418 | /* |
1418 | /* |
1419 | * Note that if the algorithm made it thus far, the interval can fit |
1419 | * Note that if the algorithm made it thus far, the interval can fit |
1420 | * only between two other intervals of the leaf. The two border cases |
1420 | * only between two other intervals of the leaf. The two border cases |
1421 | * were already resolved. |
1421 | * were already resolved. |
1422 | */ |
1422 | */ |
1423 | for (i = 1; i < leaf->keys; i++) { |
1423 | for (i = 1; i < leaf->keys; i++) { |
1424 | if (page < leaf->key[i]) { |
1424 | if (page < leaf->key[i]) { |
1425 | uintptr_t left_pg = leaf->key[i - 1]; |
1425 | uintptr_t left_pg = leaf->key[i - 1]; |
1426 | uintptr_t right_pg = leaf->key[i]; |
1426 | uintptr_t right_pg = leaf->key[i]; |
1427 | count_t left_cnt = (count_t) leaf->value[i - 1]; |
1427 | count_t left_cnt = (count_t) leaf->value[i - 1]; |
1428 | count_t right_cnt = (count_t) leaf->value[i]; |
1428 | count_t right_cnt = (count_t) leaf->value[i]; |
1429 | 1429 | ||
1430 | /* |
1430 | /* |
1431 | * The interval fits between left_pg and right_pg. |
1431 | * The interval fits between left_pg and right_pg. |
1432 | */ |
1432 | */ |
1433 | 1433 | ||
1434 | if (overlaps(page, count * PAGE_SIZE, left_pg, |
1434 | if (overlaps(page, count * PAGE_SIZE, left_pg, |
1435 | left_cnt * PAGE_SIZE)) { |
1435 | left_cnt * PAGE_SIZE)) { |
1436 | /* |
1436 | /* |
1437 | * The interval intersects with the left |
1437 | * The interval intersects with the left |
1438 | * interval. |
1438 | * interval. |
1439 | */ |
1439 | */ |
1440 | return 0; |
1440 | return 0; |
1441 | } else if (overlaps(page, count * PAGE_SIZE, right_pg, |
1441 | } else if (overlaps(page, count * PAGE_SIZE, right_pg, |
1442 | right_cnt * PAGE_SIZE)) { |
1442 | right_cnt * PAGE_SIZE)) { |
1443 | /* |
1443 | /* |
1444 | * The interval intersects with the right |
1444 | * The interval intersects with the right |
1445 | * interval. |
1445 | * interval. |
1446 | */ |
1446 | */ |
1447 | return 0; |
1447 | return 0; |
1448 | } else if ((page == left_pg + left_cnt * PAGE_SIZE) && |
1448 | } else if ((page == left_pg + left_cnt * PAGE_SIZE) && |
1449 | (page + count * PAGE_SIZE == right_pg)) { |
1449 | (page + count * PAGE_SIZE == right_pg)) { |
1450 | /* |
1450 | /* |
1451 | * The interval can be added by merging the two |
1451 | * The interval can be added by merging the two |
1452 | * already present intervals. |
1452 | * already present intervals. |
1453 | */ |
1453 | */ |
1454 | leaf->value[i - 1] += count + right_cnt; |
1454 | leaf->value[i - 1] += count + right_cnt; |
1455 | btree_remove(&a->used_space, right_pg, leaf); |
1455 | btree_remove(&a->used_space, right_pg, leaf); |
1456 | return 1; |
1456 | return 1; |
1457 | } else if (page == left_pg + left_cnt * PAGE_SIZE) { |
1457 | } else if (page == left_pg + left_cnt * PAGE_SIZE) { |
1458 | /* |
1458 | /* |
1459 | * The interval can be added by simply growing |
1459 | * The interval can be added by simply growing |
1460 | * the left interval. |
1460 | * the left interval. |
1461 | */ |
1461 | */ |
1462 | leaf->value[i - 1] += count; |
1462 | leaf->value[i - 1] += count; |
1463 | return 1; |
1463 | return 1; |
1464 | } else if (page + count * PAGE_SIZE == right_pg) { |
1464 | } else if (page + count * PAGE_SIZE == right_pg) { |
1465 | /* |
1465 | /* |
1466 | * The interval can be addded by simply moving |
1466 | * The interval can be addded by simply moving |
1467 | * base of the right interval down and |
1467 | * base of the right interval down and |
1468 | * increasing its size accordingly. |
1468 | * increasing its size accordingly. |
1469 | */ |
1469 | */ |
1470 | leaf->value[i] += count; |
1470 | leaf->value[i] += count; |
1471 | leaf->key[i] = page; |
1471 | leaf->key[i] = page; |
1472 | return 1; |
1472 | return 1; |
1473 | } else { |
1473 | } else { |
1474 | /* |
1474 | /* |
1475 | * The interval is between both neigbouring |
1475 | * The interval is between both neigbouring |
1476 | * intervals, but cannot be merged with any of |
1476 | * intervals, but cannot be merged with any of |
1477 | * them. |
1477 | * them. |
1478 | */ |
1478 | */ |
1479 | btree_insert(&a->used_space, page, |
1479 | btree_insert(&a->used_space, page, |
1480 | (void *) count, leaf); |
1480 | (void *) count, leaf); |
1481 | return 1; |
1481 | return 1; |
1482 | } |
1482 | } |
1483 | } |
1483 | } |
1484 | } |
1484 | } |
1485 | 1485 | ||
1486 | panic("Inconsistency detected while adding %d pages of used space at " |
1486 | panic("Inconsistency detected while adding %d pages of used space at " |
1487 | "%p.\n", count, page); |
1487 | "%p.\n", count, page); |
1488 | } |
1488 | } |
1489 | 1489 | ||
1490 | /** Mark portion of address space area as unused. |
1490 | /** Mark portion of address space area as unused. |
1491 | * |
1491 | * |
1492 | * The address space area must be already locked. |
1492 | * The address space area must be already locked. |
1493 | * |
1493 | * |
1494 | * @param a Address space area. |
1494 | * @param a Address space area. |
1495 | * @param page First page to be marked. |
1495 | * @param page First page to be marked. |
1496 | * @param count Number of page to be marked. |
1496 | * @param count Number of page to be marked. |
1497 | * |
1497 | * |
1498 | * @return 0 on failure and 1 on success. |
1498 | * @return 0 on failure and 1 on success. |
1499 | */ |
1499 | */ |
1500 | int used_space_remove(as_area_t *a, uintptr_t page, count_t count) |
1500 | int used_space_remove(as_area_t *a, uintptr_t page, count_t count) |
1501 | { |
1501 | { |
1502 | btree_node_t *leaf, *node; |
1502 | btree_node_t *leaf, *node; |
1503 | count_t pages; |
1503 | count_t pages; |
1504 | int i; |
1504 | int i; |
1505 | 1505 | ||
1506 | ASSERT(page == ALIGN_DOWN(page, PAGE_SIZE)); |
1506 | ASSERT(page == ALIGN_DOWN(page, PAGE_SIZE)); |
1507 | ASSERT(count); |
1507 | ASSERT(count); |
1508 | 1508 | ||
1509 | pages = (count_t) btree_search(&a->used_space, page, &leaf); |
1509 | pages = (count_t) btree_search(&a->used_space, page, &leaf); |
1510 | if (pages) { |
1510 | if (pages) { |
1511 | /* |
1511 | /* |
1512 | * We are lucky, page is the beginning of some interval. |
1512 | * We are lucky, page is the beginning of some interval. |
1513 | */ |
1513 | */ |
1514 | if (count > pages) { |
1514 | if (count > pages) { |
1515 | return 0; |
1515 | return 0; |
1516 | } else if (count == pages) { |
1516 | } else if (count == pages) { |
1517 | btree_remove(&a->used_space, page, leaf); |
1517 | btree_remove(&a->used_space, page, leaf); |
1518 | return 1; |
1518 | return 1; |
1519 | } else { |
1519 | } else { |
1520 | /* |
1520 | /* |
1521 | * Find the respective interval. |
1521 | * Find the respective interval. |
1522 | * Decrease its size and relocate its start address. |
1522 | * Decrease its size and relocate its start address. |
1523 | */ |
1523 | */ |
1524 | for (i = 0; i < leaf->keys; i++) { |
1524 | for (i = 0; i < leaf->keys; i++) { |
1525 | if (leaf->key[i] == page) { |
1525 | if (leaf->key[i] == page) { |
1526 | leaf->key[i] += count * PAGE_SIZE; |
1526 | leaf->key[i] += count * PAGE_SIZE; |
1527 | leaf->value[i] -= count; |
1527 | leaf->value[i] -= count; |
1528 | return 1; |
1528 | return 1; |
1529 | } |
1529 | } |
1530 | } |
1530 | } |
1531 | goto error; |
1531 | goto error; |
1532 | } |
1532 | } |
1533 | } |
1533 | } |
1534 | 1534 | ||
1535 | node = btree_leaf_node_left_neighbour(&a->used_space, leaf); |
1535 | node = btree_leaf_node_left_neighbour(&a->used_space, leaf); |
1536 | if (node && page < leaf->key[0]) { |
1536 | if (node && page < leaf->key[0]) { |
1537 | uintptr_t left_pg = node->key[node->keys - 1]; |
1537 | uintptr_t left_pg = node->key[node->keys - 1]; |
1538 | count_t left_cnt = (count_t) node->value[node->keys - 1]; |
1538 | count_t left_cnt = (count_t) node->value[node->keys - 1]; |
1539 | 1539 | ||
1540 | if (overlaps(left_pg, left_cnt * PAGE_SIZE, page, |
1540 | if (overlaps(left_pg, left_cnt * PAGE_SIZE, page, |
1541 | count * PAGE_SIZE)) { |
1541 | count * PAGE_SIZE)) { |
1542 | if (page + count * PAGE_SIZE == |
1542 | if (page + count * PAGE_SIZE == |
1543 | left_pg + left_cnt * PAGE_SIZE) { |
1543 | left_pg + left_cnt * PAGE_SIZE) { |
1544 | /* |
1544 | /* |
1545 | * The interval is contained in the rightmost |
1545 | * The interval is contained in the rightmost |
1546 | * interval of the left neighbour and can be |
1546 | * interval of the left neighbour and can be |
1547 | * removed by updating the size of the bigger |
1547 | * removed by updating the size of the bigger |
1548 | * interval. |
1548 | * interval. |
1549 | */ |
1549 | */ |
1550 | node->value[node->keys - 1] -= count; |
1550 | node->value[node->keys - 1] -= count; |
1551 | return 1; |
1551 | return 1; |
1552 | } else if (page + count * PAGE_SIZE < |
1552 | } else if (page + count * PAGE_SIZE < |
1553 | left_pg + left_cnt*PAGE_SIZE) { |
1553 | left_pg + left_cnt*PAGE_SIZE) { |
1554 | count_t new_cnt; |
1554 | count_t new_cnt; |
1555 | 1555 | ||
1556 | /* |
1556 | /* |
1557 | * The interval is contained in the rightmost |
1557 | * The interval is contained in the rightmost |
1558 | * interval of the left neighbour but its |
1558 | * interval of the left neighbour but its |
1559 | * removal requires both updating the size of |
1559 | * removal requires both updating the size of |
1560 | * the original interval and also inserting a |
1560 | * the original interval and also inserting a |
1561 | * new interval. |
1561 | * new interval. |
1562 | */ |
1562 | */ |
1563 | new_cnt = ((left_pg + left_cnt * PAGE_SIZE) - |
1563 | new_cnt = ((left_pg + left_cnt * PAGE_SIZE) - |
1564 | (page + count*PAGE_SIZE)) >> PAGE_WIDTH; |
1564 | (page + count*PAGE_SIZE)) >> PAGE_WIDTH; |
1565 | node->value[node->keys - 1] -= count + new_cnt; |
1565 | node->value[node->keys - 1] -= count + new_cnt; |
1566 | btree_insert(&a->used_space, page + |
1566 | btree_insert(&a->used_space, page + |
1567 | count * PAGE_SIZE, (void *) new_cnt, leaf); |
1567 | count * PAGE_SIZE, (void *) new_cnt, leaf); |
1568 | return 1; |
1568 | return 1; |
1569 | } |
1569 | } |
1570 | } |
1570 | } |
1571 | return 0; |
1571 | return 0; |
1572 | } else if (page < leaf->key[0]) { |
1572 | } else if (page < leaf->key[0]) { |
1573 | return 0; |
1573 | return 0; |
1574 | } |
1574 | } |
1575 | 1575 | ||
1576 | if (page > leaf->key[leaf->keys - 1]) { |
1576 | if (page > leaf->key[leaf->keys - 1]) { |
1577 | uintptr_t left_pg = leaf->key[leaf->keys - 1]; |
1577 | uintptr_t left_pg = leaf->key[leaf->keys - 1]; |
1578 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1578 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1579 | 1579 | ||
1580 | if (overlaps(left_pg, left_cnt * PAGE_SIZE, page, |
1580 | if (overlaps(left_pg, left_cnt * PAGE_SIZE, page, |
1581 | count * PAGE_SIZE)) { |
1581 | count * PAGE_SIZE)) { |
1582 | if (page + count * PAGE_SIZE == |
1582 | if (page + count * PAGE_SIZE == |
1583 | left_pg + left_cnt * PAGE_SIZE) { |
1583 | left_pg + left_cnt * PAGE_SIZE) { |
1584 | /* |
1584 | /* |
1585 | * The interval is contained in the rightmost |
1585 | * The interval is contained in the rightmost |
1586 | * interval of the leaf and can be removed by |
1586 | * interval of the leaf and can be removed by |
1587 | * updating the size of the bigger interval. |
1587 | * updating the size of the bigger interval. |
1588 | */ |
1588 | */ |
1589 | leaf->value[leaf->keys - 1] -= count; |
1589 | leaf->value[leaf->keys - 1] -= count; |
1590 | return 1; |
1590 | return 1; |
1591 | } else if (page + count * PAGE_SIZE < left_pg + |
1591 | } else if (page + count * PAGE_SIZE < left_pg + |
1592 | left_cnt * PAGE_SIZE) { |
1592 | left_cnt * PAGE_SIZE) { |
1593 | count_t new_cnt; |
1593 | count_t new_cnt; |
1594 | 1594 | ||
1595 | /* |
1595 | /* |
1596 | * The interval is contained in the rightmost |
1596 | * The interval is contained in the rightmost |
1597 | * interval of the leaf but its removal |
1597 | * interval of the leaf but its removal |
1598 | * requires both updating the size of the |
1598 | * requires both updating the size of the |
1599 | * original interval and also inserting a new |
1599 | * original interval and also inserting a new |
1600 | * interval. |
1600 | * interval. |
1601 | */ |
1601 | */ |
1602 | new_cnt = ((left_pg + left_cnt * PAGE_SIZE) - |
1602 | new_cnt = ((left_pg + left_cnt * PAGE_SIZE) - |
1603 | (page + count * PAGE_SIZE)) >> PAGE_WIDTH; |
1603 | (page + count * PAGE_SIZE)) >> PAGE_WIDTH; |
1604 | leaf->value[leaf->keys - 1] -= count + new_cnt; |
1604 | leaf->value[leaf->keys - 1] -= count + new_cnt; |
1605 | btree_insert(&a->used_space, page + |
1605 | btree_insert(&a->used_space, page + |
1606 | count * PAGE_SIZE, (void *) new_cnt, leaf); |
1606 | count * PAGE_SIZE, (void *) new_cnt, leaf); |
1607 | return 1; |
1607 | return 1; |
1608 | } |
1608 | } |
1609 | } |
1609 | } |
1610 | return 0; |
1610 | return 0; |
1611 | } |
1611 | } |
1612 | 1612 | ||
1613 | /* |
1613 | /* |
1614 | * The border cases have been already resolved. |
1614 | * The border cases have been already resolved. |
1615 | * Now the interval can be only between intervals of the leaf. |
1615 | * Now the interval can be only between intervals of the leaf. |
1616 | */ |
1616 | */ |
1617 | for (i = 1; i < leaf->keys - 1; i++) { |
1617 | for (i = 1; i < leaf->keys - 1; i++) { |
1618 | if (page < leaf->key[i]) { |
1618 | if (page < leaf->key[i]) { |
1619 | uintptr_t left_pg = leaf->key[i - 1]; |
1619 | uintptr_t left_pg = leaf->key[i - 1]; |
1620 | count_t left_cnt = (count_t) leaf->value[i - 1]; |
1620 | count_t left_cnt = (count_t) leaf->value[i - 1]; |
1621 | 1621 | ||
1622 | /* |
1622 | /* |
1623 | * Now the interval is between intervals corresponding |
1623 | * Now the interval is between intervals corresponding |
1624 | * to (i - 1) and i. |
1624 | * to (i - 1) and i. |
1625 | */ |
1625 | */ |
1626 | if (overlaps(left_pg, left_cnt * PAGE_SIZE, page, |
1626 | if (overlaps(left_pg, left_cnt * PAGE_SIZE, page, |
1627 | count * PAGE_SIZE)) { |
1627 | count * PAGE_SIZE)) { |
1628 | if (page + count * PAGE_SIZE == |
1628 | if (page + count * PAGE_SIZE == |
1629 | left_pg + left_cnt*PAGE_SIZE) { |
1629 | left_pg + left_cnt*PAGE_SIZE) { |
1630 | /* |
1630 | /* |
1631 | * The interval is contained in the |
1631 | * The interval is contained in the |
1632 | * interval (i - 1) of the leaf and can |
1632 | * interval (i - 1) of the leaf and can |
1633 | * be removed by updating the size of |
1633 | * be removed by updating the size of |
1634 | * the bigger interval. |
1634 | * the bigger interval. |
1635 | */ |
1635 | */ |
1636 | leaf->value[i - 1] -= count; |
1636 | leaf->value[i - 1] -= count; |
1637 | return 1; |
1637 | return 1; |
1638 | } else if (page + count * PAGE_SIZE < |
1638 | } else if (page + count * PAGE_SIZE < |
1639 | left_pg + left_cnt * PAGE_SIZE) { |
1639 | left_pg + left_cnt * PAGE_SIZE) { |
1640 | count_t new_cnt; |
1640 | count_t new_cnt; |
1641 | 1641 | ||
1642 | /* |
1642 | /* |
1643 | * The interval is contained in the |
1643 | * The interval is contained in the |
1644 | * interval (i - 1) of the leaf but its |
1644 | * interval (i - 1) of the leaf but its |
1645 | * removal requires both updating the |
1645 | * removal requires both updating the |
1646 | * size of the original interval and |
1646 | * size of the original interval and |
1647 | * also inserting a new interval. |
1647 | * also inserting a new interval. |
1648 | */ |
1648 | */ |
1649 | new_cnt = ((left_pg + |
1649 | new_cnt = ((left_pg + |
1650 | left_cnt * PAGE_SIZE) - |
1650 | left_cnt * PAGE_SIZE) - |
1651 | (page + count * PAGE_SIZE)) >> |
1651 | (page + count * PAGE_SIZE)) >> |
1652 | PAGE_WIDTH; |
1652 | PAGE_WIDTH; |
1653 | leaf->value[i - 1] -= count + new_cnt; |
1653 | leaf->value[i - 1] -= count + new_cnt; |
1654 | btree_insert(&a->used_space, page + |
1654 | btree_insert(&a->used_space, page + |
1655 | count * PAGE_SIZE, (void *) new_cnt, |
1655 | count * PAGE_SIZE, (void *) new_cnt, |
1656 | leaf); |
1656 | leaf); |
1657 | return 1; |
1657 | return 1; |
1658 | } |
1658 | } |
1659 | } |
1659 | } |
1660 | return 0; |
1660 | return 0; |
1661 | } |
1661 | } |
1662 | } |
1662 | } |
1663 | 1663 | ||
1664 | error: |
1664 | error: |
1665 | panic("Inconsistency detected while removing %d pages of used space " |
1665 | panic("Inconsistency detected while removing %d pages of used space " |
1666 | "from %p.\n", count, page); |
1666 | "from %p.\n", count, page); |
1667 | } |
1667 | } |
1668 | 1668 | ||
1669 | /** Remove reference to address space area share info. |
1669 | /** Remove reference to address space area share info. |
1670 | * |
1670 | * |
1671 | * If the reference count drops to 0, the sh_info is deallocated. |
1671 | * If the reference count drops to 0, the sh_info is deallocated. |
1672 | * |
1672 | * |
1673 | * @param sh_info Pointer to address space area share info. |
1673 | * @param sh_info Pointer to address space area share info. |
1674 | */ |
1674 | */ |
1675 | void sh_info_remove_reference(share_info_t *sh_info) |
1675 | void sh_info_remove_reference(share_info_t *sh_info) |
1676 | { |
1676 | { |
1677 | bool dealloc = false; |
1677 | bool dealloc = false; |
1678 | 1678 | ||
1679 | mutex_lock(&sh_info->lock); |
1679 | mutex_lock(&sh_info->lock); |
1680 | ASSERT(sh_info->refcount); |
1680 | ASSERT(sh_info->refcount); |
1681 | if (--sh_info->refcount == 0) { |
1681 | if (--sh_info->refcount == 0) { |
1682 | dealloc = true; |
1682 | dealloc = true; |
1683 | link_t *cur; |
1683 | link_t *cur; |
1684 | 1684 | ||
1685 | /* |
1685 | /* |
1686 | * Now walk carefully the pagemap B+tree and free/remove |
1686 | * Now walk carefully the pagemap B+tree and free/remove |
1687 | * reference from all frames found there. |
1687 | * reference from all frames found there. |
1688 | */ |
1688 | */ |
1689 | for (cur = sh_info->pagemap.leaf_head.next; |
1689 | for (cur = sh_info->pagemap.leaf_head.next; |
1690 | cur != &sh_info->pagemap.leaf_head; cur = cur->next) { |
1690 | cur != &sh_info->pagemap.leaf_head; cur = cur->next) { |
1691 | btree_node_t *node; |
1691 | btree_node_t *node; |
1692 | int i; |
1692 | int i; |
1693 | 1693 | ||
1694 | node = list_get_instance(cur, btree_node_t, leaf_link); |
1694 | node = list_get_instance(cur, btree_node_t, leaf_link); |
1695 | for (i = 0; i < node->keys; i++) |
1695 | for (i = 0; i < node->keys; i++) |
1696 | frame_free((uintptr_t) node->value[i]); |
1696 | frame_free((uintptr_t) node->value[i]); |
1697 | } |
1697 | } |
1698 | 1698 | ||
1699 | } |
1699 | } |
1700 | mutex_unlock(&sh_info->lock); |
1700 | mutex_unlock(&sh_info->lock); |
1701 | 1701 | ||
1702 | if (dealloc) { |
1702 | if (dealloc) { |
1703 | btree_destroy(&sh_info->pagemap); |
1703 | btree_destroy(&sh_info->pagemap); |
1704 | free(sh_info); |
1704 | free(sh_info); |
1705 | } |
1705 | } |
1706 | } |
1706 | } |
1707 | 1707 | ||
1708 | /* |
1708 | /* |
1709 | * Address space related syscalls. |
1709 | * Address space related syscalls. |
1710 | */ |
1710 | */ |
1711 | 1711 | ||
1712 | /** Wrapper for as_area_create(). */ |
1712 | /** Wrapper for as_area_create(). */ |
1713 | unative_t sys_as_area_create(uintptr_t address, size_t size, int flags) |
1713 | unative_t sys_as_area_create(uintptr_t address, size_t size, int flags) |
1714 | { |
1714 | { |
1715 | if (as_area_create(AS, flags | AS_AREA_CACHEABLE, size, address, |
1715 | if (as_area_create(AS, flags | AS_AREA_CACHEABLE, size, address, |
1716 | AS_AREA_ATTR_NONE, &anon_backend, NULL)) |
1716 | AS_AREA_ATTR_NONE, &anon_backend, NULL)) |
1717 | return (unative_t) address; |
1717 | return (unative_t) address; |
1718 | else |
1718 | else |
1719 | return (unative_t) -1; |
1719 | return (unative_t) -1; |
1720 | } |
1720 | } |
1721 | 1721 | ||
1722 | /** Wrapper for as_area_resize(). */ |
1722 | /** Wrapper for as_area_resize(). */ |
1723 | unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags) |
1723 | unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags) |
1724 | { |
1724 | { |
1725 | return (unative_t) as_area_resize(AS, address, size, 0); |
1725 | return (unative_t) as_area_resize(AS, address, size, 0); |
1726 | } |
1726 | } |
1727 | 1727 | ||
1728 | /** Wrapper for as_area_destroy(). */ |
1728 | /** Wrapper for as_area_destroy(). */ |
1729 | unative_t sys_as_area_destroy(uintptr_t address) |
1729 | unative_t sys_as_area_destroy(uintptr_t address) |
1730 | { |
1730 | { |
1731 | return (unative_t) as_area_destroy(AS, address); |
1731 | return (unative_t) as_area_destroy(AS, address); |
1732 | } |
1732 | } |
1733 | 1733 | ||
1734 | /** Print out information about address space. |
1734 | /** Print out information about address space. |
1735 | * |
1735 | * |
1736 | * @param as Address space. |
1736 | * @param as Address space. |
1737 | */ |
1737 | */ |
1738 | void as_print(as_t *as) |
1738 | void as_print(as_t *as) |
1739 | { |
1739 | { |
1740 | ipl_t ipl; |
1740 | ipl_t ipl; |
1741 | 1741 | ||
1742 | ipl = interrupts_disable(); |
1742 | ipl = interrupts_disable(); |
1743 | mutex_lock(&as->lock); |
1743 | mutex_lock(&as->lock); |
1744 | 1744 | ||
1745 | /* print out info about address space areas */ |
1745 | /* print out info about address space areas */ |
1746 | link_t *cur; |
1746 | link_t *cur; |
1747 | for (cur = as->as_area_btree.leaf_head.next; |
1747 | for (cur = as->as_area_btree.leaf_head.next; |
1748 | cur != &as->as_area_btree.leaf_head; cur = cur->next) { |
1748 | cur != &as->as_area_btree.leaf_head; cur = cur->next) { |
1749 | btree_node_t *node; |
1749 | btree_node_t *node; |
1750 | 1750 | ||
1751 | node = list_get_instance(cur, btree_node_t, leaf_link); |
1751 | node = list_get_instance(cur, btree_node_t, leaf_link); |
1752 | 1752 | ||
1753 | int i; |
1753 | int i; |
1754 | for (i = 0; i < node->keys; i++) { |
1754 | for (i = 0; i < node->keys; i++) { |
1755 | as_area_t *area = node->value[i]; |
1755 | as_area_t *area = node->value[i]; |
1756 | 1756 | ||
1757 | mutex_lock(&area->lock); |
1757 | mutex_lock(&area->lock); |
1758 | printf("as_area: %p, base=%p, pages=%d (%p - %p)\n", |
1758 | printf("as_area: %p, base=%p, pages=%d (%p - %p)\n", |
1759 | area, area->base, area->pages, area->base, |
1759 | area, area->base, area->pages, area->base, |
1760 | area->base + area->pages*PAGE_SIZE); |
1760 | area->base + area->pages*PAGE_SIZE); |
1761 | mutex_unlock(&area->lock); |
1761 | mutex_unlock(&area->lock); |
1762 | } |
1762 | } |
1763 | } |
1763 | } |
1764 | 1764 | ||
1765 | mutex_unlock(&as->lock); |
1765 | mutex_unlock(&as->lock); |
1766 | interrupts_restore(ipl); |
1766 | interrupts_restore(ipl); |
1767 | } |
1767 | } |
1768 | 1768 | ||
1769 | /** @} |
1769 | /** @} |
1770 | */ |
1770 | */ |
1771 | 1771 |