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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 <preemption.h> |
60 | #include <preemption.h> |
61 | #include <synch/spinlock.h> |
61 | #include <synch/spinlock.h> |
62 | #include <synch/mutex.h> |
62 | #include <synch/mutex.h> |
63 | #include <adt/list.h> |
63 | #include <adt/list.h> |
64 | #include <adt/btree.h> |
64 | #include <adt/btree.h> |
65 | #include <proc/task.h> |
65 | #include <proc/task.h> |
66 | #include <proc/thread.h> |
66 | #include <proc/thread.h> |
67 | #include <arch/asm.h> |
67 | #include <arch/asm.h> |
68 | #include <panic.h> |
68 | #include <panic.h> |
69 | #include <debug.h> |
69 | #include <debug.h> |
70 | #include <print.h> |
70 | #include <print.h> |
71 | #include <memstr.h> |
71 | #include <memstr.h> |
72 | #include <macros.h> |
72 | #include <macros.h> |
73 | #include <arch.h> |
73 | #include <arch.h> |
74 | #include <errno.h> |
74 | #include <errno.h> |
75 | #include <config.h> |
75 | #include <config.h> |
76 | #include <align.h> |
76 | #include <align.h> |
77 | #include <arch/types.h> |
77 | #include <arch/types.h> |
78 | #include <syscall/copy.h> |
78 | #include <syscall/copy.h> |
79 | #include <arch/interrupt.h> |
79 | #include <arch/interrupt.h> |
80 | 80 | ||
81 | #ifdef CONFIG_VIRT_IDX_DCACHE |
81 | #ifdef CONFIG_VIRT_IDX_DCACHE |
82 | #include <arch/mm/cache.h> |
82 | #include <arch/mm/cache.h> |
83 | #endif /* CONFIG_VIRT_IDX_DCACHE */ |
83 | #endif /* CONFIG_VIRT_IDX_DCACHE */ |
84 | 84 | ||
85 | /** |
85 | /** |
86 | * Each architecture decides what functions will be used to carry out |
86 | * Each architecture decides what functions will be used to carry out |
87 | * address space operations such as creating or locking page tables. |
87 | * address space operations such as creating or locking page tables. |
88 | */ |
88 | */ |
89 | as_operations_t *as_operations = NULL; |
89 | as_operations_t *as_operations = NULL; |
90 | 90 | ||
91 | /** |
91 | /** |
92 | * Slab for as_t objects. |
92 | * Slab for as_t objects. |
93 | */ |
93 | */ |
94 | static slab_cache_t *as_slab; |
94 | static slab_cache_t *as_slab; |
95 | 95 | ||
96 | /** |
96 | /** |
97 | * This lock serializes access to the ASID subsystem. |
97 | * This lock serializes access to the ASID subsystem. |
98 | * It protects: |
98 | * It protects: |
99 | * - inactive_as_with_asid_head list |
99 | * - inactive_as_with_asid_head list |
100 | * - as->asid for each as of the as_t type |
100 | * - as->asid for each as of the as_t type |
101 | * - asids_allocated counter |
101 | * - asids_allocated counter |
102 | */ |
102 | */ |
103 | SPINLOCK_INITIALIZE(asidlock); |
103 | SPINLOCK_INITIALIZE(asidlock); |
104 | 104 | ||
105 | /** |
105 | /** |
106 | * This list contains address spaces that are not active on any |
106 | * This list contains address spaces that are not active on any |
107 | * processor and that have valid ASID. |
107 | * processor and that have valid ASID. |
108 | */ |
108 | */ |
109 | LIST_INITIALIZE(inactive_as_with_asid_head); |
109 | LIST_INITIALIZE(inactive_as_with_asid_head); |
110 | 110 | ||
111 | /** Kernel address space. */ |
111 | /** Kernel address space. */ |
112 | as_t *AS_KERNEL = NULL; |
112 | as_t *AS_KERNEL = NULL; |
113 | 113 | ||
114 | static int area_flags_to_page_flags(int); |
114 | static int area_flags_to_page_flags(int); |
115 | static as_area_t *find_area_and_lock(as_t *, uintptr_t); |
115 | static as_area_t *find_area_and_lock(as_t *, uintptr_t); |
116 | static bool check_area_conflicts(as_t *, uintptr_t, size_t, as_area_t *); |
116 | static bool check_area_conflicts(as_t *, uintptr_t, size_t, as_area_t *); |
117 | static void sh_info_remove_reference(share_info_t *); |
117 | static void sh_info_remove_reference(share_info_t *); |
118 | 118 | ||
119 | static int as_constructor(void *obj, int flags) |
119 | static int as_constructor(void *obj, int flags) |
120 | { |
120 | { |
121 | as_t *as = (as_t *) obj; |
121 | as_t *as = (as_t *) obj; |
122 | int rc; |
122 | int rc; |
123 | 123 | ||
124 | link_initialize(&as->inactive_as_with_asid_link); |
124 | link_initialize(&as->inactive_as_with_asid_link); |
125 | mutex_initialize(&as->lock, MUTEX_PASSIVE); |
125 | mutex_initialize(&as->lock, MUTEX_PASSIVE); |
126 | 126 | ||
127 | rc = as_constructor_arch(as, flags); |
127 | rc = as_constructor_arch(as, flags); |
128 | 128 | ||
129 | return rc; |
129 | return rc; |
130 | } |
130 | } |
131 | 131 | ||
132 | static int as_destructor(void *obj) |
132 | static int as_destructor(void *obj) |
133 | { |
133 | { |
134 | as_t *as = (as_t *) obj; |
134 | as_t *as = (as_t *) obj; |
135 | 135 | ||
136 | return as_destructor_arch(as); |
136 | return as_destructor_arch(as); |
137 | } |
137 | } |
138 | 138 | ||
139 | /** Initialize address space subsystem. */ |
139 | /** Initialize address space subsystem. */ |
140 | void as_init(void) |
140 | void as_init(void) |
141 | { |
141 | { |
142 | as_arch_init(); |
142 | as_arch_init(); |
143 | 143 | ||
144 | as_slab = slab_cache_create("as_slab", sizeof(as_t), 0, |
144 | as_slab = slab_cache_create("as_slab", sizeof(as_t), 0, |
145 | as_constructor, as_destructor, SLAB_CACHE_MAGDEFERRED); |
145 | as_constructor, as_destructor, SLAB_CACHE_MAGDEFERRED); |
146 | 146 | ||
147 | AS_KERNEL = as_create(FLAG_AS_KERNEL); |
147 | AS_KERNEL = as_create(FLAG_AS_KERNEL); |
148 | if (!AS_KERNEL) |
148 | if (!AS_KERNEL) |
149 | panic("can't create kernel address space\n"); |
149 | panic("can't create kernel address space\n"); |
150 | 150 | ||
151 | } |
151 | } |
152 | 152 | ||
153 | /** Create address space. |
153 | /** Create address space. |
154 | * |
154 | * |
155 | * @param flags Flags that influence the way in wich the address space |
155 | * @param flags Flags that influence the way in wich the address space |
156 | * is created. |
156 | * is created. |
157 | */ |
157 | */ |
158 | as_t *as_create(int flags) |
158 | as_t *as_create(int flags) |
159 | { |
159 | { |
160 | as_t *as; |
160 | as_t *as; |
161 | 161 | ||
162 | as = (as_t *) slab_alloc(as_slab, 0); |
162 | as = (as_t *) slab_alloc(as_slab, 0); |
163 | (void) as_create_arch(as, 0); |
163 | (void) as_create_arch(as, 0); |
164 | 164 | ||
165 | btree_create(&as->as_area_btree); |
165 | btree_create(&as->as_area_btree); |
166 | 166 | ||
167 | if (flags & FLAG_AS_KERNEL) |
167 | if (flags & FLAG_AS_KERNEL) |
168 | as->asid = ASID_KERNEL; |
168 | as->asid = ASID_KERNEL; |
169 | else |
169 | else |
170 | as->asid = ASID_INVALID; |
170 | as->asid = ASID_INVALID; |
171 | 171 | ||
172 | atomic_set(&as->refcount, 0); |
172 | atomic_set(&as->refcount, 0); |
173 | as->cpu_refcount = 0; |
173 | as->cpu_refcount = 0; |
174 | #ifdef AS_PAGE_TABLE |
174 | #ifdef AS_PAGE_TABLE |
175 | as->genarch.page_table = page_table_create(flags); |
175 | as->genarch.page_table = page_table_create(flags); |
176 | #else |
176 | #else |
177 | page_table_create(flags); |
177 | page_table_create(flags); |
178 | #endif |
178 | #endif |
179 | 179 | ||
180 | return as; |
180 | return as; |
181 | } |
181 | } |
182 | 182 | ||
183 | /** Destroy adress space. |
183 | /** Destroy adress space. |
184 | * |
184 | * |
185 | * When there are no tasks referencing this address space (i.e. its refcount is |
185 | * When there are no tasks referencing this address space (i.e. its refcount is |
186 | * zero), the address space can be destroyed. |
186 | * zero), the address space can be destroyed. |
187 | * |
187 | * |
188 | * We know that we don't hold any spinlock. |
188 | * We know that we don't hold any spinlock. |
189 | * |
189 | * |
190 | * @param as Address space to be destroyed. |
190 | * @param as Address space to be destroyed. |
191 | */ |
191 | */ |
192 | void as_destroy(as_t *as) |
192 | void as_destroy(as_t *as) |
193 | { |
193 | { |
194 | ipl_t ipl; |
194 | ipl_t ipl; |
195 | bool cond; |
195 | bool cond; |
196 | DEADLOCK_PROBE_INIT(p_asidlock); |
196 | DEADLOCK_PROBE_INIT(p_asidlock); |
197 | 197 | ||
198 | ASSERT(atomic_get(&as->refcount) == 0); |
198 | ASSERT(atomic_get(&as->refcount) == 0); |
199 | 199 | ||
200 | /* |
200 | /* |
201 | * Since there is no reference to this area, |
201 | * Since there is no reference to this area, |
202 | * it is safe not to lock its mutex. |
202 | * it is safe not to lock its mutex. |
203 | */ |
203 | */ |
204 | 204 | ||
205 | /* |
205 | /* |
206 | * We need to avoid deadlock between TLB shootdown and asidlock. |
206 | * We need to avoid deadlock between TLB shootdown and asidlock. |
207 | * We therefore try to take asid conditionally and if we don't succeed, |
207 | * We therefore try to take asid conditionally and if we don't succeed, |
208 | * we enable interrupts and try again. This is done while preemption is |
208 | * we enable interrupts and try again. This is done while preemption is |
209 | * disabled to prevent nested context switches. We also depend on the |
209 | * disabled to prevent nested context switches. We also depend on the |
210 | * fact that so far no spinlocks are held. |
210 | * fact that so far no spinlocks are held. |
211 | */ |
211 | */ |
212 | preemption_disable(); |
212 | preemption_disable(); |
213 | ipl = interrupts_read(); |
213 | ipl = interrupts_read(); |
214 | retry: |
214 | retry: |
215 | interrupts_disable(); |
215 | interrupts_disable(); |
216 | if (!spinlock_trylock(&asidlock)) { |
216 | if (!spinlock_trylock(&asidlock)) { |
217 | interrupts_enable(); |
217 | interrupts_enable(); |
218 | DEADLOCK_PROBE(p_asidlock, DEADLOCK_THRESHOLD); |
218 | DEADLOCK_PROBE(p_asidlock, DEADLOCK_THRESHOLD); |
219 | goto retry; |
219 | goto retry; |
220 | } |
220 | } |
221 | preemption_enable(); /* Interrupts disabled, enable preemption */ |
221 | preemption_enable(); /* Interrupts disabled, enable preemption */ |
222 | if (as->asid != ASID_INVALID && as != AS_KERNEL) { |
222 | if (as->asid != ASID_INVALID && as != AS_KERNEL) { |
223 | if (as != AS && as->cpu_refcount == 0) |
223 | if (as != AS && as->cpu_refcount == 0) |
224 | list_remove(&as->inactive_as_with_asid_link); |
224 | list_remove(&as->inactive_as_with_asid_link); |
225 | asid_put(as->asid); |
225 | asid_put(as->asid); |
226 | } |
226 | } |
227 | spinlock_unlock(&asidlock); |
227 | spinlock_unlock(&asidlock); |
228 | 228 | ||
229 | /* |
229 | /* |
230 | * Destroy address space areas of the address space. |
230 | * Destroy address space areas of the address space. |
231 | * The B+tree must be walked carefully because it is |
231 | * The B+tree must be walked carefully because it is |
232 | * also being destroyed. |
232 | * also being destroyed. |
233 | */ |
233 | */ |
234 | for (cond = true; cond; ) { |
234 | for (cond = true; cond; ) { |
235 | btree_node_t *node; |
235 | btree_node_t *node; |
236 | 236 | ||
237 | ASSERT(!list_empty(&as->as_area_btree.leaf_head)); |
237 | ASSERT(!list_empty(&as->as_area_btree.leaf_head)); |
238 | node = list_get_instance(as->as_area_btree.leaf_head.next, |
238 | node = list_get_instance(as->as_area_btree.leaf_head.next, |
239 | btree_node_t, leaf_link); |
239 | btree_node_t, leaf_link); |
240 | 240 | ||
241 | if ((cond = node->keys)) { |
241 | if ((cond = node->keys)) { |
242 | as_area_destroy(as, node->key[0]); |
242 | as_area_destroy(as, node->key[0]); |
243 | } |
243 | } |
244 | } |
244 | } |
245 | 245 | ||
246 | btree_destroy(&as->as_area_btree); |
246 | btree_destroy(&as->as_area_btree); |
247 | #ifdef AS_PAGE_TABLE |
247 | #ifdef AS_PAGE_TABLE |
248 | page_table_destroy(as->genarch.page_table); |
248 | page_table_destroy(as->genarch.page_table); |
249 | #else |
249 | #else |
250 | page_table_destroy(NULL); |
250 | page_table_destroy(NULL); |
251 | #endif |
251 | #endif |
252 | 252 | ||
253 | interrupts_restore(ipl); |
253 | interrupts_restore(ipl); |
254 | 254 | ||
255 | slab_free(as_slab, as); |
255 | slab_free(as_slab, as); |
256 | } |
256 | } |
257 | 257 | ||
258 | /** Create address space area of common attributes. |
258 | /** Create address space area of common attributes. |
259 | * |
259 | * |
260 | * The created address space area is added to the target address space. |
260 | * The created address space area is added to the target address space. |
261 | * |
261 | * |
262 | * @param as Target address space. |
262 | * @param as Target address space. |
263 | * @param flags Flags of the area memory. |
263 | * @param flags Flags of the area memory. |
264 | * @param size Size of area. |
264 | * @param size Size of area. |
265 | * @param base Base address of area. |
265 | * @param base Base address of area. |
266 | * @param attrs Attributes of the area. |
266 | * @param attrs Attributes of the area. |
267 | * @param backend Address space area backend. NULL if no backend is used. |
267 | * @param backend Address space area backend. NULL if no backend is used. |
268 | * @param backend_data NULL or a pointer to an array holding two void *. |
268 | * @param backend_data NULL or a pointer to an array holding two void *. |
269 | * |
269 | * |
270 | * @return Address space area on success or NULL on failure. |
270 | * @return Address space area on success or NULL on failure. |
271 | */ |
271 | */ |
272 | as_area_t * |
272 | as_area_t * |
273 | as_area_create(as_t *as, int flags, size_t size, uintptr_t base, int attrs, |
273 | as_area_create(as_t *as, int flags, size_t size, uintptr_t base, int attrs, |
274 | mem_backend_t *backend, mem_backend_data_t *backend_data) |
274 | mem_backend_t *backend, mem_backend_data_t *backend_data) |
275 | { |
275 | { |
276 | ipl_t ipl; |
276 | ipl_t ipl; |
277 | as_area_t *a; |
277 | as_area_t *a; |
278 | 278 | ||
279 | if (base % PAGE_SIZE) |
279 | if (base % PAGE_SIZE) |
280 | return NULL; |
280 | return NULL; |
281 | 281 | ||
282 | if (!size) |
282 | if (!size) |
283 | return NULL; |
283 | return NULL; |
284 | 284 | ||
285 | /* Writeable executable areas are not supported. */ |
285 | /* Writeable executable areas are not supported. */ |
286 | if ((flags & AS_AREA_EXEC) && (flags & AS_AREA_WRITE)) |
286 | if ((flags & AS_AREA_EXEC) && (flags & AS_AREA_WRITE)) |
287 | return NULL; |
287 | return NULL; |
288 | 288 | ||
289 | ipl = interrupts_disable(); |
289 | ipl = interrupts_disable(); |
290 | mutex_lock(&as->lock); |
290 | mutex_lock(&as->lock); |
291 | 291 | ||
292 | if (!check_area_conflicts(as, base, size, NULL)) { |
292 | if (!check_area_conflicts(as, base, size, NULL)) { |
293 | mutex_unlock(&as->lock); |
293 | mutex_unlock(&as->lock); |
294 | interrupts_restore(ipl); |
294 | interrupts_restore(ipl); |
295 | return NULL; |
295 | return NULL; |
296 | } |
296 | } |
297 | 297 | ||
298 | a = (as_area_t *) malloc(sizeof(as_area_t), 0); |
298 | a = (as_area_t *) malloc(sizeof(as_area_t), 0); |
299 | 299 | ||
300 | mutex_initialize(&a->lock, MUTEX_PASSIVE); |
300 | mutex_initialize(&a->lock, MUTEX_PASSIVE); |
301 | 301 | ||
302 | a->as = as; |
302 | a->as = as; |
303 | a->flags = flags; |
303 | a->flags = flags; |
304 | a->attributes = attrs; |
304 | a->attributes = attrs; |
305 | a->pages = SIZE2FRAMES(size); |
305 | a->pages = SIZE2FRAMES(size); |
306 | a->base = base; |
306 | a->base = base; |
307 | a->sh_info = NULL; |
307 | a->sh_info = NULL; |
308 | a->backend = backend; |
308 | a->backend = backend; |
309 | if (backend_data) |
309 | if (backend_data) |
310 | a->backend_data = *backend_data; |
310 | a->backend_data = *backend_data; |
311 | else |
311 | else |
312 | memsetb(&a->backend_data, sizeof(a->backend_data), 0); |
312 | memsetb(&a->backend_data, sizeof(a->backend_data), 0); |
313 | 313 | ||
314 | btree_create(&a->used_space); |
314 | btree_create(&a->used_space); |
315 | 315 | ||
316 | btree_insert(&as->as_area_btree, base, (void *) a, NULL); |
316 | btree_insert(&as->as_area_btree, base, (void *) a, NULL); |
317 | 317 | ||
318 | mutex_unlock(&as->lock); |
318 | mutex_unlock(&as->lock); |
319 | interrupts_restore(ipl); |
319 | interrupts_restore(ipl); |
320 | 320 | ||
321 | return a; |
321 | return a; |
322 | } |
322 | } |
323 | 323 | ||
324 | /** Find address space area and change it. |
324 | /** Find address space area and change it. |
325 | * |
325 | * |
326 | * @param as Address space. |
326 | * @param as Address space. |
327 | * @param address Virtual address belonging to the area to be changed. |
327 | * @param address Virtual address belonging to the area to be changed. |
328 | * Must be page-aligned. |
328 | * Must be page-aligned. |
329 | * @param size New size of the virtual memory block starting at |
329 | * @param size New size of the virtual memory block starting at |
330 | * address. |
330 | * address. |
331 | * @param flags Flags influencing the remap operation. Currently unused. |
331 | * @param flags Flags influencing the remap operation. Currently unused. |
332 | * |
332 | * |
333 | * @return Zero on success or a value from @ref errno.h otherwise. |
333 | * @return Zero on success or a value from @ref errno.h otherwise. |
334 | */ |
334 | */ |
335 | int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags) |
335 | int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags) |
336 | { |
336 | { |
337 | as_area_t *area; |
337 | as_area_t *area; |
338 | ipl_t ipl; |
338 | ipl_t ipl; |
339 | size_t pages; |
339 | size_t pages; |
340 | 340 | ||
341 | ipl = interrupts_disable(); |
341 | ipl = interrupts_disable(); |
342 | mutex_lock(&as->lock); |
342 | mutex_lock(&as->lock); |
343 | 343 | ||
344 | /* |
344 | /* |
345 | * Locate the area. |
345 | * Locate the area. |
346 | */ |
346 | */ |
347 | area = find_area_and_lock(as, address); |
347 | area = find_area_and_lock(as, address); |
348 | if (!area) { |
348 | if (!area) { |
349 | mutex_unlock(&as->lock); |
349 | mutex_unlock(&as->lock); |
350 | interrupts_restore(ipl); |
350 | interrupts_restore(ipl); |
351 | return ENOENT; |
351 | return ENOENT; |
352 | } |
352 | } |
353 | 353 | ||
354 | if (area->backend == &phys_backend) { |
354 | if (area->backend == &phys_backend) { |
355 | /* |
355 | /* |
356 | * Remapping of address space areas associated |
356 | * Remapping of address space areas associated |
357 | * with memory mapped devices is not supported. |
357 | * with memory mapped devices is not supported. |
358 | */ |
358 | */ |
359 | mutex_unlock(&area->lock); |
359 | mutex_unlock(&area->lock); |
360 | mutex_unlock(&as->lock); |
360 | mutex_unlock(&as->lock); |
361 | interrupts_restore(ipl); |
361 | interrupts_restore(ipl); |
362 | return ENOTSUP; |
362 | return ENOTSUP; |
363 | } |
363 | } |
364 | if (area->sh_info) { |
364 | if (area->sh_info) { |
365 | /* |
365 | /* |
366 | * Remapping of shared address space areas |
366 | * Remapping of shared address space areas |
367 | * is not supported. |
367 | * is not supported. |
368 | */ |
368 | */ |
369 | mutex_unlock(&area->lock); |
369 | mutex_unlock(&area->lock); |
370 | mutex_unlock(&as->lock); |
370 | mutex_unlock(&as->lock); |
371 | interrupts_restore(ipl); |
371 | interrupts_restore(ipl); |
372 | return ENOTSUP; |
372 | return ENOTSUP; |
373 | } |
373 | } |
374 | 374 | ||
375 | pages = SIZE2FRAMES((address - area->base) + size); |
375 | pages = SIZE2FRAMES((address - area->base) + size); |
376 | if (!pages) { |
376 | if (!pages) { |
377 | /* |
377 | /* |
378 | * Zero size address space areas are not allowed. |
378 | * Zero size address space areas are not allowed. |
379 | */ |
379 | */ |
380 | mutex_unlock(&area->lock); |
380 | mutex_unlock(&area->lock); |
381 | mutex_unlock(&as->lock); |
381 | mutex_unlock(&as->lock); |
382 | interrupts_restore(ipl); |
382 | interrupts_restore(ipl); |
383 | return EPERM; |
383 | return EPERM; |
384 | } |
384 | } |
385 | 385 | ||
386 | if (pages < area->pages) { |
386 | if (pages < area->pages) { |
387 | bool cond; |
387 | bool cond; |
388 | uintptr_t start_free = area->base + pages*PAGE_SIZE; |
388 | uintptr_t start_free = area->base + pages * PAGE_SIZE; |
389 | 389 | ||
390 | /* |
390 | /* |
391 | * Shrinking the area. |
391 | * Shrinking the area. |
392 | * No need to check for overlaps. |
392 | * No need to check for overlaps. |
393 | */ |
393 | */ |
394 | 394 | ||
395 | /* |
395 | /* |
396 | * Start TLB shootdown sequence. |
396 | * Start TLB shootdown sequence. |
397 | */ |
397 | */ |
398 | tlb_shootdown_start(TLB_INVL_PAGES, AS->asid, area->base + |
398 | tlb_shootdown_start(TLB_INVL_PAGES, as->asid, area->base + |
399 | pages * PAGE_SIZE, area->pages - pages); |
399 | pages * PAGE_SIZE, area->pages - pages); |
400 | 400 | ||
401 | /* |
401 | /* |
402 | * Remove frames belonging to used space starting from |
402 | * Remove frames belonging to used space starting from |
403 | * the highest addresses downwards until an overlap with |
403 | * the highest addresses downwards until an overlap with |
404 | * the resized address space area is found. Note that this |
404 | * the resized address space area is found. Note that this |
405 | * is also the right way to remove part of the used_space |
405 | * is also the right way to remove part of the used_space |
406 | * B+tree leaf list. |
406 | * B+tree leaf list. |
407 | */ |
407 | */ |
408 | for (cond = true; cond;) { |
408 | for (cond = true; cond;) { |
409 | btree_node_t *node; |
409 | btree_node_t *node; |
410 | 410 | ||
411 | ASSERT(!list_empty(&area->used_space.leaf_head)); |
411 | ASSERT(!list_empty(&area->used_space.leaf_head)); |
412 | node = |
412 | node = |
413 | list_get_instance(area->used_space.leaf_head.prev, |
413 | list_get_instance(area->used_space.leaf_head.prev, |
414 | btree_node_t, leaf_link); |
414 | btree_node_t, leaf_link); |
415 | if ((cond = (bool) node->keys)) { |
415 | if ((cond = (bool) node->keys)) { |
416 | uintptr_t b = node->key[node->keys - 1]; |
416 | uintptr_t b = node->key[node->keys - 1]; |
417 | count_t c = |
417 | count_t c = |
418 | (count_t) node->value[node->keys - 1]; |
418 | (count_t) node->value[node->keys - 1]; |
419 | unsigned int i = 0; |
419 | unsigned int i = 0; |
420 | 420 | ||
421 | if (overlaps(b, c * PAGE_SIZE, area->base, |
421 | if (overlaps(b, c * PAGE_SIZE, area->base, |
422 | pages * PAGE_SIZE)) { |
422 | pages * PAGE_SIZE)) { |
423 | 423 | ||
424 | if (b + c * PAGE_SIZE <= start_free) { |
424 | if (b + c * PAGE_SIZE <= start_free) { |
425 | /* |
425 | /* |
426 | * The whole interval fits |
426 | * The whole interval fits |
427 | * completely in the resized |
427 | * completely in the resized |
428 | * address space area. |
428 | * address space area. |
429 | */ |
429 | */ |
430 | break; |
430 | break; |
431 | } |
431 | } |
432 | 432 | ||
433 | /* |
433 | /* |
434 | * Part of the interval corresponding |
434 | * Part of the interval corresponding |
435 | * to b and c overlaps with the resized |
435 | * to b and c overlaps with the resized |
436 | * address space area. |
436 | * address space area. |
437 | */ |
437 | */ |
438 | 438 | ||
439 | cond = false; /* we are almost done */ |
439 | cond = false; /* we are almost done */ |
440 | i = (start_free - b) >> PAGE_WIDTH; |
440 | i = (start_free - b) >> PAGE_WIDTH; |
441 | if (!used_space_remove(area, start_free, |
441 | if (!used_space_remove(area, start_free, |
442 | c - i)) |
442 | c - i)) |
443 | panic("Could not remove used " |
443 | panic("Could not remove used " |
444 | "space.\n"); |
444 | "space.\n"); |
445 | } else { |
445 | } else { |
446 | /* |
446 | /* |
447 | * The interval of used space can be |
447 | * The interval of used space can be |
448 | * completely removed. |
448 | * completely removed. |
449 | */ |
449 | */ |
450 | if (!used_space_remove(area, b, c)) |
450 | if (!used_space_remove(area, b, c)) |
451 | panic("Could not remove used " |
451 | panic("Could not remove used " |
452 | "space.\n"); |
452 | "space.\n"); |
453 | } |
453 | } |
454 | 454 | ||
455 | for (; i < c; i++) { |
455 | for (; i < c; i++) { |
456 | pte_t *pte; |
456 | pte_t *pte; |
457 | 457 | ||
458 | page_table_lock(as, false); |
458 | page_table_lock(as, false); |
459 | pte = page_mapping_find(as, b + |
459 | pte = page_mapping_find(as, b + |
460 | i * PAGE_SIZE); |
460 | i * PAGE_SIZE); |
461 | ASSERT(pte && PTE_VALID(pte) && |
461 | ASSERT(pte && PTE_VALID(pte) && |
462 | PTE_PRESENT(pte)); |
462 | PTE_PRESENT(pte)); |
463 | if (area->backend && |
463 | if (area->backend && |
464 | area->backend->frame_free) { |
464 | area->backend->frame_free) { |
465 | area->backend->frame_free(area, |
465 | area->backend->frame_free(area, |
466 | b + i * PAGE_SIZE, |
466 | b + i * PAGE_SIZE, |
467 | PTE_GET_FRAME(pte)); |
467 | PTE_GET_FRAME(pte)); |
468 | } |
468 | } |
469 | page_mapping_remove(as, b + |
469 | page_mapping_remove(as, b + |
470 | i * PAGE_SIZE); |
470 | i * PAGE_SIZE); |
471 | page_table_unlock(as, false); |
471 | page_table_unlock(as, false); |
472 | } |
472 | } |
473 | } |
473 | } |
474 | } |
474 | } |
475 | 475 | ||
476 | /* |
476 | /* |
477 | * Finish TLB shootdown sequence. |
477 | * Finish TLB shootdown sequence. |
478 | */ |
478 | */ |
479 | 479 | ||
480 | tlb_invalidate_pages(as->asid, area->base + pages * PAGE_SIZE, |
480 | tlb_invalidate_pages(as->asid, area->base + pages * PAGE_SIZE, |
481 | area->pages - pages); |
481 | area->pages - pages); |
482 | /* |
482 | /* |
483 | * Invalidate software translation caches (e.g. TSB on sparc64). |
483 | * Invalidate software translation caches (e.g. TSB on sparc64). |
484 | */ |
484 | */ |
485 | as_invalidate_translation_cache(as, area->base + |
485 | as_invalidate_translation_cache(as, area->base + |
486 | pages * PAGE_SIZE, area->pages - pages); |
486 | pages * PAGE_SIZE, area->pages - pages); |
487 | tlb_shootdown_finalize(); |
487 | tlb_shootdown_finalize(); |
488 | 488 | ||
489 | } else { |
489 | } else { |
490 | /* |
490 | /* |
491 | * Growing the area. |
491 | * Growing the area. |
492 | * Check for overlaps with other address space areas. |
492 | * Check for overlaps with other address space areas. |
493 | */ |
493 | */ |
494 | if (!check_area_conflicts(as, address, pages * PAGE_SIZE, |
494 | if (!check_area_conflicts(as, address, pages * PAGE_SIZE, |
495 | area)) { |
495 | area)) { |
496 | mutex_unlock(&area->lock); |
496 | mutex_unlock(&area->lock); |
497 | mutex_unlock(&as->lock); |
497 | mutex_unlock(&as->lock); |
498 | interrupts_restore(ipl); |
498 | interrupts_restore(ipl); |
499 | return EADDRNOTAVAIL; |
499 | return EADDRNOTAVAIL; |
500 | } |
500 | } |
501 | } |
501 | } |
502 | 502 | ||
503 | area->pages = pages; |
503 | area->pages = pages; |
504 | 504 | ||
505 | mutex_unlock(&area->lock); |
505 | mutex_unlock(&area->lock); |
506 | mutex_unlock(&as->lock); |
506 | mutex_unlock(&as->lock); |
507 | interrupts_restore(ipl); |
507 | interrupts_restore(ipl); |
508 | 508 | ||
509 | return 0; |
509 | return 0; |
510 | } |
510 | } |
511 | 511 | ||
512 | /** Destroy address space area. |
512 | /** Destroy address space area. |
513 | * |
513 | * |
514 | * @param as Address space. |
514 | * @param as Address space. |
515 | * @param address Address within the area to be deleted. |
515 | * @param address Address within the area to be deleted. |
516 | * |
516 | * |
517 | * @return Zero on success or a value from @ref errno.h on failure. |
517 | * @return Zero on success or a value from @ref errno.h on failure. |
518 | */ |
518 | */ |
519 | int as_area_destroy(as_t *as, uintptr_t address) |
519 | int as_area_destroy(as_t *as, uintptr_t address) |
520 | { |
520 | { |
521 | as_area_t *area; |
521 | as_area_t *area; |
522 | uintptr_t base; |
522 | uintptr_t base; |
523 | link_t *cur; |
523 | link_t *cur; |
524 | ipl_t ipl; |
524 | ipl_t ipl; |
525 | 525 | ||
526 | ipl = interrupts_disable(); |
526 | ipl = interrupts_disable(); |
527 | mutex_lock(&as->lock); |
527 | mutex_lock(&as->lock); |
528 | 528 | ||
529 | area = find_area_and_lock(as, address); |
529 | area = find_area_and_lock(as, address); |
530 | if (!area) { |
530 | if (!area) { |
531 | mutex_unlock(&as->lock); |
531 | mutex_unlock(&as->lock); |
532 | interrupts_restore(ipl); |
532 | interrupts_restore(ipl); |
533 | return ENOENT; |
533 | return ENOENT; |
534 | } |
534 | } |
535 | 535 | ||
536 | base = area->base; |
536 | base = area->base; |
537 | 537 | ||
538 | /* |
538 | /* |
539 | * Start TLB shootdown sequence. |
539 | * Start TLB shootdown sequence. |
540 | */ |
540 | */ |
541 | tlb_shootdown_start(TLB_INVL_PAGES, as->asid, area->base, area->pages); |
541 | tlb_shootdown_start(TLB_INVL_PAGES, as->asid, area->base, area->pages); |
542 | 542 | ||
543 | /* |
543 | /* |
544 | * Visit only the pages mapped by used_space B+tree. |
544 | * Visit only the pages mapped by used_space B+tree. |
545 | */ |
545 | */ |
546 | for (cur = area->used_space.leaf_head.next; |
546 | for (cur = area->used_space.leaf_head.next; |
547 | cur != &area->used_space.leaf_head; cur = cur->next) { |
547 | cur != &area->used_space.leaf_head; cur = cur->next) { |
548 | btree_node_t *node; |
548 | btree_node_t *node; |
549 | unsigned int i; |
549 | unsigned int i; |
550 | 550 | ||
551 | node = list_get_instance(cur, btree_node_t, leaf_link); |
551 | node = list_get_instance(cur, btree_node_t, leaf_link); |
552 | for (i = 0; i < node->keys; i++) { |
552 | for (i = 0; i < node->keys; i++) { |
553 | uintptr_t b = node->key[i]; |
553 | uintptr_t b = node->key[i]; |
554 | count_t j; |
554 | count_t j; |
555 | pte_t *pte; |
555 | pte_t *pte; |
556 | 556 | ||
557 | for (j = 0; j < (count_t) node->value[i]; j++) { |
557 | for (j = 0; j < (count_t) node->value[i]; j++) { |
558 | page_table_lock(as, false); |
558 | page_table_lock(as, false); |
559 | pte = page_mapping_find(as, b + j * PAGE_SIZE); |
559 | pte = page_mapping_find(as, b + j * PAGE_SIZE); |
560 | ASSERT(pte && PTE_VALID(pte) && |
560 | ASSERT(pte && PTE_VALID(pte) && |
561 | PTE_PRESENT(pte)); |
561 | PTE_PRESENT(pte)); |
562 | if (area->backend && |
562 | if (area->backend && |
563 | area->backend->frame_free) { |
563 | area->backend->frame_free) { |
564 | area->backend->frame_free(area, b + |
564 | area->backend->frame_free(area, b + |
565 | j * PAGE_SIZE, PTE_GET_FRAME(pte)); |
565 | j * PAGE_SIZE, PTE_GET_FRAME(pte)); |
566 | } |
566 | } |
567 | page_mapping_remove(as, b + j * PAGE_SIZE); |
567 | page_mapping_remove(as, b + j * PAGE_SIZE); |
568 | page_table_unlock(as, false); |
568 | page_table_unlock(as, false); |
569 | } |
569 | } |
570 | } |
570 | } |
571 | } |
571 | } |
572 | 572 | ||
573 | /* |
573 | /* |
574 | * Finish TLB shootdown sequence. |
574 | * Finish TLB shootdown sequence. |
575 | */ |
575 | */ |
576 | 576 | ||
577 | tlb_invalidate_pages(as->asid, area->base, area->pages); |
577 | tlb_invalidate_pages(as->asid, area->base, area->pages); |
578 | /* |
578 | /* |
579 | * Invalidate potential software translation caches (e.g. TSB on |
579 | * Invalidate potential software translation caches (e.g. TSB on |
580 | * sparc64). |
580 | * sparc64). |
581 | */ |
581 | */ |
582 | as_invalidate_translation_cache(as, area->base, area->pages); |
582 | as_invalidate_translation_cache(as, area->base, area->pages); |
583 | tlb_shootdown_finalize(); |
583 | tlb_shootdown_finalize(); |
584 | 584 | ||
585 | btree_destroy(&area->used_space); |
585 | btree_destroy(&area->used_space); |
586 | 586 | ||
587 | area->attributes |= AS_AREA_ATTR_PARTIAL; |
587 | area->attributes |= AS_AREA_ATTR_PARTIAL; |
588 | 588 | ||
589 | if (area->sh_info) |
589 | if (area->sh_info) |
590 | sh_info_remove_reference(area->sh_info); |
590 | sh_info_remove_reference(area->sh_info); |
591 | 591 | ||
592 | mutex_unlock(&area->lock); |
592 | mutex_unlock(&area->lock); |
593 | 593 | ||
594 | /* |
594 | /* |
595 | * Remove the empty area from address space. |
595 | * Remove the empty area from address space. |
596 | */ |
596 | */ |
597 | btree_remove(&as->as_area_btree, base, NULL); |
597 | btree_remove(&as->as_area_btree, base, NULL); |
598 | 598 | ||
599 | free(area); |
599 | free(area); |
600 | 600 | ||
601 | mutex_unlock(&as->lock); |
601 | mutex_unlock(&as->lock); |
602 | interrupts_restore(ipl); |
602 | interrupts_restore(ipl); |
603 | return 0; |
603 | return 0; |
604 | } |
604 | } |
605 | 605 | ||
606 | /** Share address space area with another or the same address space. |
606 | /** Share address space area with another or the same address space. |
607 | * |
607 | * |
608 | * Address space area mapping is shared with a new address space area. |
608 | * Address space area mapping is shared with a new address space area. |
609 | * If the source address space area has not been shared so far, |
609 | * If the source address space area has not been shared so far, |
610 | * a new sh_info is created. The new address space area simply gets the |
610 | * a new sh_info is created. The new address space area simply gets the |
611 | * sh_info of the source area. The process of duplicating the |
611 | * sh_info of the source area. The process of duplicating the |
612 | * mapping is done through the backend share function. |
612 | * mapping is done through the backend share function. |
613 | * |
613 | * |
614 | * @param src_as Pointer to source address space. |
614 | * @param src_as Pointer to source address space. |
615 | * @param src_base Base address of the source address space area. |
615 | * @param src_base Base address of the source address space area. |
616 | * @param acc_size Expected size of the source area. |
616 | * @param acc_size Expected size of the source area. |
617 | * @param dst_as Pointer to destination address space. |
617 | * @param dst_as Pointer to destination address space. |
618 | * @param dst_base Target base address. |
618 | * @param dst_base Target base address. |
619 | * @param dst_flags_mask Destination address space area flags mask. |
619 | * @param dst_flags_mask Destination address space area flags mask. |
620 | * |
620 | * |
621 | * @return Zero on success or ENOENT if there is no such task or if |
621 | * @return Zero on success or ENOENT if there is no such task or if |
622 | * there is no such address space area, EPERM if there was |
622 | * there is no such address space area, EPERM if there was |
623 | * a problem in accepting the area or ENOMEM if there was a |
623 | * a problem in accepting the area or ENOMEM if there was a |
624 | * problem in allocating destination address space area. |
624 | * problem in allocating destination address space area. |
625 | * ENOTSUP is returned if the address space area backend |
625 | * ENOTSUP is returned if the address space area backend |
626 | * does not support sharing. |
626 | * does not support sharing. |
627 | */ |
627 | */ |
628 | int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size, |
628 | int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size, |
629 | as_t *dst_as, uintptr_t dst_base, int dst_flags_mask) |
629 | as_t *dst_as, uintptr_t dst_base, int dst_flags_mask) |
630 | { |
630 | { |
631 | ipl_t ipl; |
631 | ipl_t ipl; |
632 | int src_flags; |
632 | int src_flags; |
633 | size_t src_size; |
633 | size_t src_size; |
634 | as_area_t *src_area, *dst_area; |
634 | as_area_t *src_area, *dst_area; |
635 | share_info_t *sh_info; |
635 | share_info_t *sh_info; |
636 | mem_backend_t *src_backend; |
636 | mem_backend_t *src_backend; |
637 | mem_backend_data_t src_backend_data; |
637 | mem_backend_data_t src_backend_data; |
638 | 638 | ||
639 | ipl = interrupts_disable(); |
639 | ipl = interrupts_disable(); |
640 | mutex_lock(&src_as->lock); |
640 | mutex_lock(&src_as->lock); |
641 | src_area = find_area_and_lock(src_as, src_base); |
641 | src_area = find_area_and_lock(src_as, src_base); |
642 | if (!src_area) { |
642 | if (!src_area) { |
643 | /* |
643 | /* |
644 | * Could not find the source address space area. |
644 | * Could not find the source address space area. |
645 | */ |
645 | */ |
646 | mutex_unlock(&src_as->lock); |
646 | mutex_unlock(&src_as->lock); |
647 | interrupts_restore(ipl); |
647 | interrupts_restore(ipl); |
648 | return ENOENT; |
648 | return ENOENT; |
649 | } |
649 | } |
650 | 650 | ||
651 | if (!src_area->backend || !src_area->backend->share) { |
651 | if (!src_area->backend || !src_area->backend->share) { |
652 | /* |
652 | /* |
653 | * There is no backend or the backend does not |
653 | * There is no backend or the backend does not |
654 | * know how to share the area. |
654 | * know how to share the area. |
655 | */ |
655 | */ |
656 | mutex_unlock(&src_area->lock); |
656 | mutex_unlock(&src_area->lock); |
657 | mutex_unlock(&src_as->lock); |
657 | mutex_unlock(&src_as->lock); |
658 | interrupts_restore(ipl); |
658 | interrupts_restore(ipl); |
659 | return ENOTSUP; |
659 | return ENOTSUP; |
660 | } |
660 | } |
661 | 661 | ||
662 | src_size = src_area->pages * PAGE_SIZE; |
662 | src_size = src_area->pages * PAGE_SIZE; |
663 | src_flags = src_area->flags; |
663 | src_flags = src_area->flags; |
664 | src_backend = src_area->backend; |
664 | src_backend = src_area->backend; |
665 | src_backend_data = src_area->backend_data; |
665 | src_backend_data = src_area->backend_data; |
666 | 666 | ||
667 | /* Share the cacheable flag from the original mapping */ |
667 | /* Share the cacheable flag from the original mapping */ |
668 | if (src_flags & AS_AREA_CACHEABLE) |
668 | if (src_flags & AS_AREA_CACHEABLE) |
669 | dst_flags_mask |= AS_AREA_CACHEABLE; |
669 | dst_flags_mask |= AS_AREA_CACHEABLE; |
670 | 670 | ||
671 | if (src_size != acc_size || |
671 | if (src_size != acc_size || |
672 | (src_flags & dst_flags_mask) != dst_flags_mask) { |
672 | (src_flags & dst_flags_mask) != dst_flags_mask) { |
673 | mutex_unlock(&src_area->lock); |
673 | mutex_unlock(&src_area->lock); |
674 | mutex_unlock(&src_as->lock); |
674 | mutex_unlock(&src_as->lock); |
675 | interrupts_restore(ipl); |
675 | interrupts_restore(ipl); |
676 | return EPERM; |
676 | return EPERM; |
677 | } |
677 | } |
678 | 678 | ||
679 | /* |
679 | /* |
680 | * Now we are committed to sharing the area. |
680 | * Now we are committed to sharing the area. |
681 | * First, prepare the area for sharing. |
681 | * First, prepare the area for sharing. |
682 | * Then it will be safe to unlock it. |
682 | * Then it will be safe to unlock it. |
683 | */ |
683 | */ |
684 | sh_info = src_area->sh_info; |
684 | sh_info = src_area->sh_info; |
685 | if (!sh_info) { |
685 | if (!sh_info) { |
686 | sh_info = (share_info_t *) malloc(sizeof(share_info_t), 0); |
686 | sh_info = (share_info_t *) malloc(sizeof(share_info_t), 0); |
687 | mutex_initialize(&sh_info->lock, MUTEX_PASSIVE); |
687 | mutex_initialize(&sh_info->lock, MUTEX_PASSIVE); |
688 | sh_info->refcount = 2; |
688 | sh_info->refcount = 2; |
689 | btree_create(&sh_info->pagemap); |
689 | btree_create(&sh_info->pagemap); |
690 | src_area->sh_info = sh_info; |
690 | src_area->sh_info = sh_info; |
691 | /* |
691 | /* |
692 | * Call the backend to setup sharing. |
692 | * Call the backend to setup sharing. |
693 | */ |
693 | */ |
694 | src_area->backend->share(src_area); |
694 | src_area->backend->share(src_area); |
695 | } else { |
695 | } else { |
696 | mutex_lock(&sh_info->lock); |
696 | mutex_lock(&sh_info->lock); |
697 | sh_info->refcount++; |
697 | sh_info->refcount++; |
698 | mutex_unlock(&sh_info->lock); |
698 | mutex_unlock(&sh_info->lock); |
699 | } |
699 | } |
700 | 700 | ||
701 | mutex_unlock(&src_area->lock); |
701 | mutex_unlock(&src_area->lock); |
702 | mutex_unlock(&src_as->lock); |
702 | mutex_unlock(&src_as->lock); |
703 | 703 | ||
704 | /* |
704 | /* |
705 | * Create copy of the source address space area. |
705 | * Create copy of the source address space area. |
706 | * The destination area is created with AS_AREA_ATTR_PARTIAL |
706 | * The destination area is created with AS_AREA_ATTR_PARTIAL |
707 | * attribute set which prevents race condition with |
707 | * attribute set which prevents race condition with |
708 | * preliminary as_page_fault() calls. |
708 | * preliminary as_page_fault() calls. |
709 | * The flags of the source area are masked against dst_flags_mask |
709 | * The flags of the source area are masked against dst_flags_mask |
710 | * to support sharing in less privileged mode. |
710 | * to support sharing in less privileged mode. |
711 | */ |
711 | */ |
712 | dst_area = as_area_create(dst_as, dst_flags_mask, src_size, dst_base, |
712 | dst_area = as_area_create(dst_as, dst_flags_mask, src_size, dst_base, |
713 | AS_AREA_ATTR_PARTIAL, src_backend, &src_backend_data); |
713 | AS_AREA_ATTR_PARTIAL, src_backend, &src_backend_data); |
714 | if (!dst_area) { |
714 | if (!dst_area) { |
715 | /* |
715 | /* |
716 | * Destination address space area could not be created. |
716 | * Destination address space area could not be created. |
717 | */ |
717 | */ |
718 | sh_info_remove_reference(sh_info); |
718 | sh_info_remove_reference(sh_info); |
719 | 719 | ||
720 | interrupts_restore(ipl); |
720 | interrupts_restore(ipl); |
721 | return ENOMEM; |
721 | return ENOMEM; |
722 | } |
722 | } |
723 | 723 | ||
724 | /* |
724 | /* |
725 | * Now the destination address space area has been |
725 | * Now the destination address space area has been |
726 | * fully initialized. Clear the AS_AREA_ATTR_PARTIAL |
726 | * fully initialized. Clear the AS_AREA_ATTR_PARTIAL |
727 | * attribute and set the sh_info. |
727 | * attribute and set the sh_info. |
728 | */ |
728 | */ |
729 | mutex_lock(&dst_as->lock); |
729 | mutex_lock(&dst_as->lock); |
730 | mutex_lock(&dst_area->lock); |
730 | mutex_lock(&dst_area->lock); |
731 | dst_area->attributes &= ~AS_AREA_ATTR_PARTIAL; |
731 | dst_area->attributes &= ~AS_AREA_ATTR_PARTIAL; |
732 | dst_area->sh_info = sh_info; |
732 | dst_area->sh_info = sh_info; |
733 | mutex_unlock(&dst_area->lock); |
733 | mutex_unlock(&dst_area->lock); |
734 | mutex_unlock(&dst_as->lock); |
734 | mutex_unlock(&dst_as->lock); |
735 | 735 | ||
736 | interrupts_restore(ipl); |
736 | interrupts_restore(ipl); |
737 | 737 | ||
738 | return 0; |
738 | return 0; |
739 | } |
739 | } |
740 | 740 | ||
741 | /** Check access mode for address space area. |
741 | /** Check access mode for address space area. |
742 | * |
742 | * |
743 | * The address space area must be locked prior to this call. |
743 | * The address space area must be locked prior to this call. |
744 | * |
744 | * |
745 | * @param area Address space area. |
745 | * @param area Address space area. |
746 | * @param access Access mode. |
746 | * @param access Access mode. |
747 | * |
747 | * |
748 | * @return False if access violates area's permissions, true |
748 | * @return False if access violates area's permissions, true |
749 | * otherwise. |
749 | * otherwise. |
750 | */ |
750 | */ |
751 | bool as_area_check_access(as_area_t *area, pf_access_t access) |
751 | bool as_area_check_access(as_area_t *area, pf_access_t access) |
752 | { |
752 | { |
753 | int flagmap[] = { |
753 | int flagmap[] = { |
754 | [PF_ACCESS_READ] = AS_AREA_READ, |
754 | [PF_ACCESS_READ] = AS_AREA_READ, |
755 | [PF_ACCESS_WRITE] = AS_AREA_WRITE, |
755 | [PF_ACCESS_WRITE] = AS_AREA_WRITE, |
756 | [PF_ACCESS_EXEC] = AS_AREA_EXEC |
756 | [PF_ACCESS_EXEC] = AS_AREA_EXEC |
757 | }; |
757 | }; |
758 | 758 | ||
759 | if (!(area->flags & flagmap[access])) |
759 | if (!(area->flags & flagmap[access])) |
760 | return false; |
760 | return false; |
761 | 761 | ||
762 | return true; |
762 | return true; |
763 | } |
763 | } |
764 | 764 | ||
765 | /** Change adress space area flags. |
765 | /** Change adress space area flags. |
766 | * |
766 | * |
767 | * The idea is to have the same data, but with a different access mode. |
767 | * The idea is to have the same data, but with a different access mode. |
768 | * This is needed e.g. for writing code into memory and then executing it. |
768 | * This is needed e.g. for writing code into memory and then executing it. |
769 | * In order for this to work properly, this may copy the data |
769 | * In order for this to work properly, this may copy the data |
770 | * into private anonymous memory (unless it's already there). |
770 | * into private anonymous memory (unless it's already there). |
771 | * |
771 | * |
772 | * @param as Address space. |
772 | * @param as Address space. |
773 | * @param flags Flags of the area memory. |
773 | * @param flags Flags of the area memory. |
774 | * @param address Address withing the area to be changed. |
774 | * @param address Address withing the area to be changed. |
775 | * |
775 | * |
776 | * @return Zero on success or a value from @ref errno.h on failure. |
776 | * @return Zero on success or a value from @ref errno.h on failure. |
777 | */ |
777 | */ |
778 | int as_area_change_flags(as_t *as, int flags, uintptr_t address) |
778 | int as_area_change_flags(as_t *as, int flags, uintptr_t address) |
779 | { |
779 | { |
780 | as_area_t *area; |
780 | as_area_t *area; |
781 | uintptr_t base; |
781 | uintptr_t base; |
782 | link_t *cur; |
782 | link_t *cur; |
783 | ipl_t ipl; |
783 | ipl_t ipl; |
784 | int page_flags; |
784 | int page_flags; |
785 | uintptr_t *old_frame; |
785 | uintptr_t *old_frame; |
786 | index_t frame_idx; |
786 | index_t frame_idx; |
787 | count_t used_pages; |
787 | count_t used_pages; |
788 | 788 | ||
789 | /* Flags for the new memory mapping */ |
789 | /* Flags for the new memory mapping */ |
790 | page_flags = area_flags_to_page_flags(flags); |
790 | page_flags = area_flags_to_page_flags(flags); |
791 | 791 | ||
792 | ipl = interrupts_disable(); |
792 | ipl = interrupts_disable(); |
793 | mutex_lock(&as->lock); |
793 | mutex_lock(&as->lock); |
794 | 794 | ||
795 | area = find_area_and_lock(as, address); |
795 | area = find_area_and_lock(as, address); |
796 | if (!area) { |
796 | if (!area) { |
797 | mutex_unlock(&as->lock); |
797 | mutex_unlock(&as->lock); |
798 | interrupts_restore(ipl); |
798 | interrupts_restore(ipl); |
799 | return ENOENT; |
799 | return ENOENT; |
800 | } |
800 | } |
801 | 801 | ||
802 | if (area->sh_info || area->backend != &anon_backend) { |
802 | if (area->sh_info || area->backend != &anon_backend) { |
803 | /* Copying shared areas not supported yet */ |
803 | /* Copying shared areas not supported yet */ |
804 | /* Copying non-anonymous memory not supported yet */ |
804 | /* Copying non-anonymous memory not supported yet */ |
805 | mutex_unlock(&area->lock); |
805 | mutex_unlock(&area->lock); |
806 | mutex_unlock(&as->lock); |
806 | mutex_unlock(&as->lock); |
807 | interrupts_restore(ipl); |
807 | interrupts_restore(ipl); |
808 | return ENOTSUP; |
808 | return ENOTSUP; |
809 | } |
809 | } |
810 | 810 | ||
811 | base = area->base; |
811 | base = area->base; |
812 | 812 | ||
813 | /* |
813 | /* |
814 | * Compute total number of used pages in the used_space B+tree |
814 | * Compute total number of used pages in the used_space B+tree |
815 | */ |
815 | */ |
816 | used_pages = 0; |
816 | used_pages = 0; |
817 | 817 | ||
818 | for (cur = area->used_space.leaf_head.next; |
818 | for (cur = area->used_space.leaf_head.next; |
819 | cur != &area->used_space.leaf_head; cur = cur->next) { |
819 | cur != &area->used_space.leaf_head; cur = cur->next) { |
820 | btree_node_t *node; |
820 | btree_node_t *node; |
821 | unsigned int i; |
821 | unsigned int i; |
822 | 822 | ||
823 | node = list_get_instance(cur, btree_node_t, leaf_link); |
823 | node = list_get_instance(cur, btree_node_t, leaf_link); |
824 | for (i = 0; i < node->keys; i++) { |
824 | for (i = 0; i < node->keys; i++) { |
825 | used_pages += (count_t) node->value[i]; |
825 | used_pages += (count_t) node->value[i]; |
826 | } |
826 | } |
827 | } |
827 | } |
828 | 828 | ||
829 | /* An array for storing frame numbers */ |
829 | /* An array for storing frame numbers */ |
830 | old_frame = malloc(used_pages * sizeof(uintptr_t), 0); |
830 | old_frame = malloc(used_pages * sizeof(uintptr_t), 0); |
831 | 831 | ||
832 | /* |
832 | /* |
833 | * Start TLB shootdown sequence. |
833 | * Start TLB shootdown sequence. |
834 | */ |
834 | */ |
835 | tlb_shootdown_start(TLB_INVL_PAGES, as->asid, area->base, area->pages); |
835 | tlb_shootdown_start(TLB_INVL_PAGES, as->asid, area->base, area->pages); |
836 | 836 | ||
837 | /* |
837 | /* |
838 | * Remove used pages from page tables and remember their frame |
838 | * Remove used pages from page tables and remember their frame |
839 | * numbers. |
839 | * numbers. |
840 | */ |
840 | */ |
841 | frame_idx = 0; |
841 | frame_idx = 0; |
842 | 842 | ||
843 | for (cur = area->used_space.leaf_head.next; |
843 | for (cur = area->used_space.leaf_head.next; |
844 | cur != &area->used_space.leaf_head; cur = cur->next) { |
844 | cur != &area->used_space.leaf_head; cur = cur->next) { |
845 | btree_node_t *node; |
845 | btree_node_t *node; |
846 | unsigned int i; |
846 | unsigned int i; |
847 | 847 | ||
848 | node = list_get_instance(cur, btree_node_t, leaf_link); |
848 | node = list_get_instance(cur, btree_node_t, leaf_link); |
849 | for (i = 0; i < node->keys; i++) { |
849 | for (i = 0; i < node->keys; i++) { |
850 | uintptr_t b = node->key[i]; |
850 | uintptr_t b = node->key[i]; |
851 | count_t j; |
851 | count_t j; |
852 | pte_t *pte; |
852 | pte_t *pte; |
853 | 853 | ||
854 | for (j = 0; j < (count_t) node->value[i]; j++) { |
854 | for (j = 0; j < (count_t) node->value[i]; j++) { |
855 | page_table_lock(as, false); |
855 | page_table_lock(as, false); |
856 | pte = page_mapping_find(as, b + j * PAGE_SIZE); |
856 | pte = page_mapping_find(as, b + j * PAGE_SIZE); |
857 | ASSERT(pte && PTE_VALID(pte) && |
857 | ASSERT(pte && PTE_VALID(pte) && |
858 | PTE_PRESENT(pte)); |
858 | PTE_PRESENT(pte)); |
859 | old_frame[frame_idx++] = PTE_GET_FRAME(pte); |
859 | old_frame[frame_idx++] = PTE_GET_FRAME(pte); |
860 | 860 | ||
861 | /* Remove old mapping */ |
861 | /* Remove old mapping */ |
862 | page_mapping_remove(as, b + j * PAGE_SIZE); |
862 | page_mapping_remove(as, b + j * PAGE_SIZE); |
863 | page_table_unlock(as, false); |
863 | page_table_unlock(as, false); |
864 | } |
864 | } |
865 | } |
865 | } |
866 | } |
866 | } |
867 | 867 | ||
868 | /* |
868 | /* |
869 | * Finish TLB shootdown sequence. |
869 | * Finish TLB shootdown sequence. |
870 | */ |
870 | */ |
871 | 871 | ||
872 | tlb_invalidate_pages(as->asid, area->base, area->pages); |
872 | tlb_invalidate_pages(as->asid, area->base, area->pages); |
873 | /* |
873 | /* |
874 | * Invalidate potential software translation caches (e.g. TSB on |
874 | * Invalidate potential software translation caches (e.g. TSB on |
875 | * sparc64). |
875 | * sparc64). |
876 | */ |
876 | */ |
877 | as_invalidate_translation_cache(as, area->base, area->pages); |
877 | as_invalidate_translation_cache(as, area->base, area->pages); |
878 | tlb_shootdown_finalize(); |
878 | tlb_shootdown_finalize(); |
879 | 879 | ||
880 | /* |
880 | /* |
881 | * Set the new flags. |
881 | * Set the new flags. |
882 | */ |
882 | */ |
883 | area->flags = flags; |
883 | area->flags = flags; |
884 | 884 | ||
885 | /* |
885 | /* |
886 | * Map pages back in with new flags. This step is kept separate |
886 | * Map pages back in with new flags. This step is kept separate |
887 | * so that the memory area could not be accesed with both the old and |
887 | * so that the memory area could not be accesed with both the old and |
888 | * the new flags at once. |
888 | * the new flags at once. |
889 | */ |
889 | */ |
890 | frame_idx = 0; |
890 | frame_idx = 0; |
891 | 891 | ||
892 | for (cur = area->used_space.leaf_head.next; |
892 | for (cur = area->used_space.leaf_head.next; |
893 | cur != &area->used_space.leaf_head; cur = cur->next) { |
893 | cur != &area->used_space.leaf_head; cur = cur->next) { |
894 | btree_node_t *node; |
894 | btree_node_t *node; |
895 | unsigned int i; |
895 | unsigned int i; |
896 | 896 | ||
897 | node = list_get_instance(cur, btree_node_t, leaf_link); |
897 | node = list_get_instance(cur, btree_node_t, leaf_link); |
898 | for (i = 0; i < node->keys; i++) { |
898 | for (i = 0; i < node->keys; i++) { |
899 | uintptr_t b = node->key[i]; |
899 | uintptr_t b = node->key[i]; |
900 | count_t j; |
900 | count_t j; |
901 | 901 | ||
902 | for (j = 0; j < (count_t) node->value[i]; j++) { |
902 | for (j = 0; j < (count_t) node->value[i]; j++) { |
903 | page_table_lock(as, false); |
903 | page_table_lock(as, false); |
904 | 904 | ||
905 | /* Insert the new mapping */ |
905 | /* Insert the new mapping */ |
906 | page_mapping_insert(as, b + j * PAGE_SIZE, |
906 | page_mapping_insert(as, b + j * PAGE_SIZE, |
907 | old_frame[frame_idx++], page_flags); |
907 | old_frame[frame_idx++], page_flags); |
908 | 908 | ||
909 | page_table_unlock(as, false); |
909 | page_table_unlock(as, false); |
910 | } |
910 | } |
911 | } |
911 | } |
912 | } |
912 | } |
913 | 913 | ||
914 | free(old_frame); |
914 | free(old_frame); |
915 | 915 | ||
916 | mutex_unlock(&area->lock); |
916 | mutex_unlock(&area->lock); |
917 | mutex_unlock(&as->lock); |
917 | mutex_unlock(&as->lock); |
918 | interrupts_restore(ipl); |
918 | interrupts_restore(ipl); |
919 | 919 | ||
920 | return 0; |
920 | return 0; |
921 | } |
921 | } |
922 | 922 | ||
923 | 923 | ||
924 | /** Handle page fault within the current address space. |
924 | /** Handle page fault within the current address space. |
925 | * |
925 | * |
926 | * This is the high-level page fault handler. It decides whether the page fault |
926 | * This is the high-level page fault handler. It decides whether the page fault |
927 | * can be resolved by any backend and if so, it invokes the backend to resolve |
927 | * can be resolved by any backend and if so, it invokes the backend to resolve |
928 | * the page fault. |
928 | * the page fault. |
929 | * |
929 | * |
930 | * Interrupts are assumed disabled. |
930 | * Interrupts are assumed disabled. |
931 | * |
931 | * |
932 | * @param page Faulting page. |
932 | * @param page Faulting page. |
933 | * @param access Access mode that caused the page fault (i.e. |
933 | * @param access Access mode that caused the page fault (i.e. |
934 | * read/write/exec). |
934 | * read/write/exec). |
935 | * @param istate Pointer to the interrupted state. |
935 | * @param istate Pointer to the interrupted state. |
936 | * |
936 | * |
937 | * @return AS_PF_FAULT on page fault, AS_PF_OK on success or |
937 | * @return AS_PF_FAULT on page fault, AS_PF_OK on success or |
938 | * AS_PF_DEFER if the fault was caused by copy_to_uspace() |
938 | * AS_PF_DEFER if the fault was caused by copy_to_uspace() |
939 | * or copy_from_uspace(). |
939 | * or copy_from_uspace(). |
940 | */ |
940 | */ |
941 | int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate) |
941 | int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate) |
942 | { |
942 | { |
943 | pte_t *pte; |
943 | pte_t *pte; |
944 | as_area_t *area; |
944 | as_area_t *area; |
945 | 945 | ||
946 | if (!THREAD) |
946 | if (!THREAD) |
947 | return AS_PF_FAULT; |
947 | return AS_PF_FAULT; |
948 | 948 | ||
949 | ASSERT(AS); |
949 | ASSERT(AS); |
950 | 950 | ||
951 | mutex_lock(&AS->lock); |
951 | mutex_lock(&AS->lock); |
952 | area = find_area_and_lock(AS, page); |
952 | area = find_area_and_lock(AS, page); |
953 | if (!area) { |
953 | if (!area) { |
954 | /* |
954 | /* |
955 | * No area contained mapping for 'page'. |
955 | * No area contained mapping for 'page'. |
956 | * Signal page fault to low-level handler. |
956 | * Signal page fault to low-level handler. |
957 | */ |
957 | */ |
958 | mutex_unlock(&AS->lock); |
958 | mutex_unlock(&AS->lock); |
959 | goto page_fault; |
959 | goto page_fault; |
960 | } |
960 | } |
961 | 961 | ||
962 | if (area->attributes & AS_AREA_ATTR_PARTIAL) { |
962 | if (area->attributes & AS_AREA_ATTR_PARTIAL) { |
963 | /* |
963 | /* |
964 | * The address space area is not fully initialized. |
964 | * The address space area is not fully initialized. |
965 | * Avoid possible race by returning error. |
965 | * Avoid possible race by returning error. |
966 | */ |
966 | */ |
967 | mutex_unlock(&area->lock); |
967 | mutex_unlock(&area->lock); |
968 | mutex_unlock(&AS->lock); |
968 | mutex_unlock(&AS->lock); |
969 | goto page_fault; |
969 | goto page_fault; |
970 | } |
970 | } |
971 | 971 | ||
972 | if (!area->backend || !area->backend->page_fault) { |
972 | if (!area->backend || !area->backend->page_fault) { |
973 | /* |
973 | /* |
974 | * The address space area is not backed by any backend |
974 | * The address space area is not backed by any backend |
975 | * or the backend cannot handle page faults. |
975 | * or the backend cannot handle page faults. |
976 | */ |
976 | */ |
977 | mutex_unlock(&area->lock); |
977 | mutex_unlock(&area->lock); |
978 | mutex_unlock(&AS->lock); |
978 | mutex_unlock(&AS->lock); |
979 | goto page_fault; |
979 | goto page_fault; |
980 | } |
980 | } |
981 | 981 | ||
982 | page_table_lock(AS, false); |
982 | page_table_lock(AS, false); |
983 | 983 | ||
984 | /* |
984 | /* |
985 | * To avoid race condition between two page faults on the same address, |
985 | * To avoid race condition between two page faults on the same address, |
986 | * we need to make sure the mapping has not been already inserted. |
986 | * we need to make sure the mapping has not been already inserted. |
987 | */ |
987 | */ |
988 | if ((pte = page_mapping_find(AS, page))) { |
988 | if ((pte = page_mapping_find(AS, page))) { |
989 | if (PTE_PRESENT(pte)) { |
989 | if (PTE_PRESENT(pte)) { |
990 | if (((access == PF_ACCESS_READ) && PTE_READABLE(pte)) || |
990 | if (((access == PF_ACCESS_READ) && PTE_READABLE(pte)) || |
991 | (access == PF_ACCESS_WRITE && PTE_WRITABLE(pte)) || |
991 | (access == PF_ACCESS_WRITE && PTE_WRITABLE(pte)) || |
992 | (access == PF_ACCESS_EXEC && PTE_EXECUTABLE(pte))) { |
992 | (access == PF_ACCESS_EXEC && PTE_EXECUTABLE(pte))) { |
993 | page_table_unlock(AS, false); |
993 | page_table_unlock(AS, false); |
994 | mutex_unlock(&area->lock); |
994 | mutex_unlock(&area->lock); |
995 | mutex_unlock(&AS->lock); |
995 | mutex_unlock(&AS->lock); |
996 | return AS_PF_OK; |
996 | return AS_PF_OK; |
997 | } |
997 | } |
998 | } |
998 | } |
999 | } |
999 | } |
1000 | 1000 | ||
1001 | /* |
1001 | /* |
1002 | * Resort to the backend page fault handler. |
1002 | * Resort to the backend page fault handler. |
1003 | */ |
1003 | */ |
1004 | if (area->backend->page_fault(area, page, access) != AS_PF_OK) { |
1004 | if (area->backend->page_fault(area, page, access) != AS_PF_OK) { |
1005 | page_table_unlock(AS, false); |
1005 | page_table_unlock(AS, false); |
1006 | mutex_unlock(&area->lock); |
1006 | mutex_unlock(&area->lock); |
1007 | mutex_unlock(&AS->lock); |
1007 | mutex_unlock(&AS->lock); |
1008 | goto page_fault; |
1008 | goto page_fault; |
1009 | } |
1009 | } |
1010 | 1010 | ||
1011 | page_table_unlock(AS, false); |
1011 | page_table_unlock(AS, false); |
1012 | mutex_unlock(&area->lock); |
1012 | mutex_unlock(&area->lock); |
1013 | mutex_unlock(&AS->lock); |
1013 | mutex_unlock(&AS->lock); |
1014 | return AS_PF_OK; |
1014 | return AS_PF_OK; |
1015 | 1015 | ||
1016 | page_fault: |
1016 | page_fault: |
1017 | if (THREAD->in_copy_from_uspace) { |
1017 | if (THREAD->in_copy_from_uspace) { |
1018 | THREAD->in_copy_from_uspace = false; |
1018 | THREAD->in_copy_from_uspace = false; |
1019 | istate_set_retaddr(istate, |
1019 | istate_set_retaddr(istate, |
1020 | (uintptr_t) &memcpy_from_uspace_failover_address); |
1020 | (uintptr_t) &memcpy_from_uspace_failover_address); |
1021 | } else if (THREAD->in_copy_to_uspace) { |
1021 | } else if (THREAD->in_copy_to_uspace) { |
1022 | THREAD->in_copy_to_uspace = false; |
1022 | THREAD->in_copy_to_uspace = false; |
1023 | istate_set_retaddr(istate, |
1023 | istate_set_retaddr(istate, |
1024 | (uintptr_t) &memcpy_to_uspace_failover_address); |
1024 | (uintptr_t) &memcpy_to_uspace_failover_address); |
1025 | } else { |
1025 | } else { |
1026 | return AS_PF_FAULT; |
1026 | return AS_PF_FAULT; |
1027 | } |
1027 | } |
1028 | 1028 | ||
1029 | return AS_PF_DEFER; |
1029 | return AS_PF_DEFER; |
1030 | } |
1030 | } |
1031 | 1031 | ||
1032 | /** Switch address spaces. |
1032 | /** Switch address spaces. |
1033 | * |
1033 | * |
1034 | * Note that this function cannot sleep as it is essentially a part of |
1034 | * Note that this function cannot sleep as it is essentially a part of |
1035 | * scheduling. Sleeping here would lead to deadlock on wakeup. Another |
1035 | * scheduling. Sleeping here would lead to deadlock on wakeup. Another |
1036 | * thing which is forbidden in this context is locking the address space. |
1036 | * thing which is forbidden in this context is locking the address space. |
1037 | * |
1037 | * |
1038 | * When this function is enetered, no spinlocks may be held. |
1038 | * When this function is enetered, no spinlocks may be held. |
1039 | * |
1039 | * |
1040 | * @param old Old address space or NULL. |
1040 | * @param old Old address space or NULL. |
1041 | * @param new New address space. |
1041 | * @param new New address space. |
1042 | */ |
1042 | */ |
1043 | void as_switch(as_t *old_as, as_t *new_as) |
1043 | void as_switch(as_t *old_as, as_t *new_as) |
1044 | { |
1044 | { |
1045 | DEADLOCK_PROBE_INIT(p_asidlock); |
1045 | DEADLOCK_PROBE_INIT(p_asidlock); |
1046 | preemption_disable(); |
1046 | preemption_disable(); |
1047 | retry: |
1047 | retry: |
1048 | (void) interrupts_disable(); |
1048 | (void) interrupts_disable(); |
1049 | if (!spinlock_trylock(&asidlock)) { |
1049 | if (!spinlock_trylock(&asidlock)) { |
1050 | /* |
1050 | /* |
1051 | * Avoid deadlock with TLB shootdown. |
1051 | * Avoid deadlock with TLB shootdown. |
1052 | * We can enable interrupts here because |
1052 | * We can enable interrupts here because |
1053 | * preemption is disabled. We should not be |
1053 | * preemption is disabled. We should not be |
1054 | * holding any other lock. |
1054 | * holding any other lock. |
1055 | */ |
1055 | */ |
1056 | (void) interrupts_enable(); |
1056 | (void) interrupts_enable(); |
1057 | DEADLOCK_PROBE(p_asidlock, DEADLOCK_THRESHOLD); |
1057 | DEADLOCK_PROBE(p_asidlock, DEADLOCK_THRESHOLD); |
1058 | goto retry; |
1058 | goto retry; |
1059 | } |
1059 | } |
1060 | preemption_enable(); |
1060 | preemption_enable(); |
1061 | 1061 | ||
1062 | /* |
1062 | /* |
1063 | * First, take care of the old address space. |
1063 | * First, take care of the old address space. |
1064 | */ |
1064 | */ |
1065 | if (old_as) { |
1065 | if (old_as) { |
1066 | ASSERT(old_as->cpu_refcount); |
1066 | ASSERT(old_as->cpu_refcount); |
1067 | if((--old_as->cpu_refcount == 0) && (old_as != AS_KERNEL)) { |
1067 | if((--old_as->cpu_refcount == 0) && (old_as != AS_KERNEL)) { |
1068 | /* |
1068 | /* |
1069 | * The old address space is no longer active on |
1069 | * The old address space is no longer active on |
1070 | * any processor. It can be appended to the |
1070 | * any processor. It can be appended to the |
1071 | * list of inactive address spaces with assigned |
1071 | * list of inactive address spaces with assigned |
1072 | * ASID. |
1072 | * ASID. |
1073 | */ |
1073 | */ |
1074 | ASSERT(old_as->asid != ASID_INVALID); |
1074 | ASSERT(old_as->asid != ASID_INVALID); |
1075 | list_append(&old_as->inactive_as_with_asid_link, |
1075 | list_append(&old_as->inactive_as_with_asid_link, |
1076 | &inactive_as_with_asid_head); |
1076 | &inactive_as_with_asid_head); |
1077 | } |
1077 | } |
1078 | 1078 | ||
1079 | /* |
1079 | /* |
1080 | * Perform architecture-specific tasks when the address space |
1080 | * Perform architecture-specific tasks when the address space |
1081 | * is being removed from the CPU. |
1081 | * is being removed from the CPU. |
1082 | */ |
1082 | */ |
1083 | as_deinstall_arch(old_as); |
1083 | as_deinstall_arch(old_as); |
1084 | } |
1084 | } |
1085 | 1085 | ||
1086 | /* |
1086 | /* |
1087 | * Second, prepare the new address space. |
1087 | * Second, prepare the new address space. |
1088 | */ |
1088 | */ |
1089 | if ((new_as->cpu_refcount++ == 0) && (new_as != AS_KERNEL)) { |
1089 | if ((new_as->cpu_refcount++ == 0) && (new_as != AS_KERNEL)) { |
1090 | if (new_as->asid != ASID_INVALID) |
1090 | if (new_as->asid != ASID_INVALID) |
1091 | list_remove(&new_as->inactive_as_with_asid_link); |
1091 | list_remove(&new_as->inactive_as_with_asid_link); |
1092 | else |
1092 | else |
1093 | new_as->asid = asid_get(); |
1093 | new_as->asid = asid_get(); |
1094 | } |
1094 | } |
1095 | #ifdef AS_PAGE_TABLE |
1095 | #ifdef AS_PAGE_TABLE |
1096 | SET_PTL0_ADDRESS(new_as->genarch.page_table); |
1096 | SET_PTL0_ADDRESS(new_as->genarch.page_table); |
1097 | #endif |
1097 | #endif |
1098 | 1098 | ||
1099 | /* |
1099 | /* |
1100 | * Perform architecture-specific steps. |
1100 | * Perform architecture-specific steps. |
1101 | * (e.g. write ASID to hardware register etc.) |
1101 | * (e.g. write ASID to hardware register etc.) |
1102 | */ |
1102 | */ |
1103 | as_install_arch(new_as); |
1103 | as_install_arch(new_as); |
1104 | 1104 | ||
1105 | spinlock_unlock(&asidlock); |
1105 | spinlock_unlock(&asidlock); |
1106 | 1106 | ||
1107 | AS = new_as; |
1107 | AS = new_as; |
1108 | } |
1108 | } |
1109 | 1109 | ||
1110 | /** Convert address space area flags to page flags. |
1110 | /** Convert address space area flags to page flags. |
1111 | * |
1111 | * |
1112 | * @param aflags Flags of some address space area. |
1112 | * @param aflags Flags of some address space area. |
1113 | * |
1113 | * |
1114 | * @return Flags to be passed to page_mapping_insert(). |
1114 | * @return Flags to be passed to page_mapping_insert(). |
1115 | */ |
1115 | */ |
1116 | int area_flags_to_page_flags(int aflags) |
1116 | int area_flags_to_page_flags(int aflags) |
1117 | { |
1117 | { |
1118 | int flags; |
1118 | int flags; |
1119 | 1119 | ||
1120 | flags = PAGE_USER | PAGE_PRESENT; |
1120 | flags = PAGE_USER | PAGE_PRESENT; |
1121 | 1121 | ||
1122 | if (aflags & AS_AREA_READ) |
1122 | if (aflags & AS_AREA_READ) |
1123 | flags |= PAGE_READ; |
1123 | flags |= PAGE_READ; |
1124 | 1124 | ||
1125 | if (aflags & AS_AREA_WRITE) |
1125 | if (aflags & AS_AREA_WRITE) |
1126 | flags |= PAGE_WRITE; |
1126 | flags |= PAGE_WRITE; |
1127 | 1127 | ||
1128 | if (aflags & AS_AREA_EXEC) |
1128 | if (aflags & AS_AREA_EXEC) |
1129 | flags |= PAGE_EXEC; |
1129 | flags |= PAGE_EXEC; |
1130 | 1130 | ||
1131 | if (aflags & AS_AREA_CACHEABLE) |
1131 | if (aflags & AS_AREA_CACHEABLE) |
1132 | flags |= PAGE_CACHEABLE; |
1132 | flags |= PAGE_CACHEABLE; |
1133 | 1133 | ||
1134 | return flags; |
1134 | return flags; |
1135 | } |
1135 | } |
1136 | 1136 | ||
1137 | /** Compute flags for virtual address translation subsytem. |
1137 | /** Compute flags for virtual address translation subsytem. |
1138 | * |
1138 | * |
1139 | * The address space area must be locked. |
1139 | * The address space area must be locked. |
1140 | * Interrupts must be disabled. |
1140 | * Interrupts must be disabled. |
1141 | * |
1141 | * |
1142 | * @param a Address space area. |
1142 | * @param a Address space area. |
1143 | * |
1143 | * |
1144 | * @return Flags to be used in page_mapping_insert(). |
1144 | * @return Flags to be used in page_mapping_insert(). |
1145 | */ |
1145 | */ |
1146 | int as_area_get_flags(as_area_t *a) |
1146 | int as_area_get_flags(as_area_t *a) |
1147 | { |
1147 | { |
1148 | return area_flags_to_page_flags(a->flags); |
1148 | return area_flags_to_page_flags(a->flags); |
1149 | } |
1149 | } |
1150 | 1150 | ||
1151 | /** Create page table. |
1151 | /** Create page table. |
1152 | * |
1152 | * |
1153 | * Depending on architecture, create either address space private or global page |
1153 | * Depending on architecture, create either address space private or global page |
1154 | * table. |
1154 | * table. |
1155 | * |
1155 | * |
1156 | * @param flags Flags saying whether the page table is for the kernel |
1156 | * @param flags Flags saying whether the page table is for the kernel |
1157 | * address space. |
1157 | * address space. |
1158 | * |
1158 | * |
1159 | * @return First entry of the page table. |
1159 | * @return First entry of the page table. |
1160 | */ |
1160 | */ |
1161 | pte_t *page_table_create(int flags) |
1161 | pte_t *page_table_create(int flags) |
1162 | { |
1162 | { |
1163 | ASSERT(as_operations); |
1163 | ASSERT(as_operations); |
1164 | ASSERT(as_operations->page_table_create); |
1164 | ASSERT(as_operations->page_table_create); |
1165 | 1165 | ||
1166 | return as_operations->page_table_create(flags); |
1166 | return as_operations->page_table_create(flags); |
1167 | } |
1167 | } |
1168 | 1168 | ||
1169 | /** Destroy page table. |
1169 | /** Destroy page table. |
1170 | * |
1170 | * |
1171 | * Destroy page table in architecture specific way. |
1171 | * Destroy page table in architecture specific way. |
1172 | * |
1172 | * |
1173 | * @param page_table Physical address of PTL0. |
1173 | * @param page_table Physical address of PTL0. |
1174 | */ |
1174 | */ |
1175 | void page_table_destroy(pte_t *page_table) |
1175 | void page_table_destroy(pte_t *page_table) |
1176 | { |
1176 | { |
1177 | ASSERT(as_operations); |
1177 | ASSERT(as_operations); |
1178 | ASSERT(as_operations->page_table_destroy); |
1178 | ASSERT(as_operations->page_table_destroy); |
1179 | 1179 | ||
1180 | as_operations->page_table_destroy(page_table); |
1180 | as_operations->page_table_destroy(page_table); |
1181 | } |
1181 | } |
1182 | 1182 | ||
1183 | /** Lock page table. |
1183 | /** Lock page table. |
1184 | * |
1184 | * |
1185 | * This function should be called before any page_mapping_insert(), |
1185 | * This function should be called before any page_mapping_insert(), |
1186 | * page_mapping_remove() and page_mapping_find(). |
1186 | * page_mapping_remove() and page_mapping_find(). |
1187 | * |
1187 | * |
1188 | * Locking order is such that address space areas must be locked |
1188 | * Locking order is such that address space areas must be locked |
1189 | * prior to this call. Address space can be locked prior to this |
1189 | * prior to this call. Address space can be locked prior to this |
1190 | * call in which case the lock argument is false. |
1190 | * call in which case the lock argument is false. |
1191 | * |
1191 | * |
1192 | * @param as Address space. |
1192 | * @param as Address space. |
1193 | * @param lock If false, do not attempt to lock as->lock. |
1193 | * @param lock If false, do not attempt to lock as->lock. |
1194 | */ |
1194 | */ |
1195 | void page_table_lock(as_t *as, bool lock) |
1195 | void page_table_lock(as_t *as, bool lock) |
1196 | { |
1196 | { |
1197 | ASSERT(as_operations); |
1197 | ASSERT(as_operations); |
1198 | ASSERT(as_operations->page_table_lock); |
1198 | ASSERT(as_operations->page_table_lock); |
1199 | 1199 | ||
1200 | as_operations->page_table_lock(as, lock); |
1200 | as_operations->page_table_lock(as, lock); |
1201 | } |
1201 | } |
1202 | 1202 | ||
1203 | /** Unlock page table. |
1203 | /** Unlock page table. |
1204 | * |
1204 | * |
1205 | * @param as Address space. |
1205 | * @param as Address space. |
1206 | * @param unlock If false, do not attempt to unlock as->lock. |
1206 | * @param unlock If false, do not attempt to unlock as->lock. |
1207 | */ |
1207 | */ |
1208 | void page_table_unlock(as_t *as, bool unlock) |
1208 | void page_table_unlock(as_t *as, bool unlock) |
1209 | { |
1209 | { |
1210 | ASSERT(as_operations); |
1210 | ASSERT(as_operations); |
1211 | ASSERT(as_operations->page_table_unlock); |
1211 | ASSERT(as_operations->page_table_unlock); |
1212 | 1212 | ||
1213 | as_operations->page_table_unlock(as, unlock); |
1213 | as_operations->page_table_unlock(as, unlock); |
1214 | } |
1214 | } |
1215 | 1215 | ||
1216 | 1216 | ||
1217 | /** Find address space area and lock it. |
1217 | /** Find address space area and lock it. |
1218 | * |
1218 | * |
1219 | * The address space must be locked and interrupts must be disabled. |
1219 | * The address space must be locked and interrupts must be disabled. |
1220 | * |
1220 | * |
1221 | * @param as Address space. |
1221 | * @param as Address space. |
1222 | * @param va Virtual address. |
1222 | * @param va Virtual address. |
1223 | * |
1223 | * |
1224 | * @return Locked address space area containing va on success or |
1224 | * @return Locked address space area containing va on success or |
1225 | * NULL on failure. |
1225 | * NULL on failure. |
1226 | */ |
1226 | */ |
1227 | as_area_t *find_area_and_lock(as_t *as, uintptr_t va) |
1227 | as_area_t *find_area_and_lock(as_t *as, uintptr_t va) |
1228 | { |
1228 | { |
1229 | as_area_t *a; |
1229 | as_area_t *a; |
1230 | btree_node_t *leaf, *lnode; |
1230 | btree_node_t *leaf, *lnode; |
1231 | unsigned int i; |
1231 | unsigned int i; |
1232 | 1232 | ||
1233 | a = (as_area_t *) btree_search(&as->as_area_btree, va, &leaf); |
1233 | a = (as_area_t *) btree_search(&as->as_area_btree, va, &leaf); |
1234 | if (a) { |
1234 | if (a) { |
1235 | /* va is the base address of an address space area */ |
1235 | /* va is the base address of an address space area */ |
1236 | mutex_lock(&a->lock); |
1236 | mutex_lock(&a->lock); |
1237 | return a; |
1237 | return a; |
1238 | } |
1238 | } |
1239 | 1239 | ||
1240 | /* |
1240 | /* |
1241 | * Search the leaf node and the righmost record of its left neighbour |
1241 | * Search the leaf node and the righmost record of its left neighbour |
1242 | * to find out whether this is a miss or va belongs to an address |
1242 | * to find out whether this is a miss or va belongs to an address |
1243 | * space area found there. |
1243 | * space area found there. |
1244 | */ |
1244 | */ |
1245 | 1245 | ||
1246 | /* First, search the leaf node itself. */ |
1246 | /* First, search the leaf node itself. */ |
1247 | for (i = 0; i < leaf->keys; i++) { |
1247 | for (i = 0; i < leaf->keys; i++) { |
1248 | a = (as_area_t *) leaf->value[i]; |
1248 | a = (as_area_t *) leaf->value[i]; |
1249 | mutex_lock(&a->lock); |
1249 | mutex_lock(&a->lock); |
1250 | if ((a->base <= va) && (va < a->base + a->pages * PAGE_SIZE)) { |
1250 | if ((a->base <= va) && (va < a->base + a->pages * PAGE_SIZE)) { |
1251 | return a; |
1251 | return a; |
1252 | } |
1252 | } |
1253 | mutex_unlock(&a->lock); |
1253 | mutex_unlock(&a->lock); |
1254 | } |
1254 | } |
1255 | 1255 | ||
1256 | /* |
1256 | /* |
1257 | * Second, locate the left neighbour and test its last record. |
1257 | * Second, locate the left neighbour and test its last record. |
1258 | * Because of its position in the B+tree, it must have base < va. |
1258 | * Because of its position in the B+tree, it must have base < va. |
1259 | */ |
1259 | */ |
1260 | lnode = btree_leaf_node_left_neighbour(&as->as_area_btree, leaf); |
1260 | lnode = btree_leaf_node_left_neighbour(&as->as_area_btree, leaf); |
1261 | if (lnode) { |
1261 | if (lnode) { |
1262 | a = (as_area_t *) lnode->value[lnode->keys - 1]; |
1262 | a = (as_area_t *) lnode->value[lnode->keys - 1]; |
1263 | mutex_lock(&a->lock); |
1263 | mutex_lock(&a->lock); |
1264 | if (va < a->base + a->pages * PAGE_SIZE) { |
1264 | if (va < a->base + a->pages * PAGE_SIZE) { |
1265 | return a; |
1265 | return a; |
1266 | } |
1266 | } |
1267 | mutex_unlock(&a->lock); |
1267 | mutex_unlock(&a->lock); |
1268 | } |
1268 | } |
1269 | 1269 | ||
1270 | return NULL; |
1270 | return NULL; |
1271 | } |
1271 | } |
1272 | 1272 | ||
1273 | /** Check area conflicts with other areas. |
1273 | /** Check area conflicts with other areas. |
1274 | * |
1274 | * |
1275 | * The address space must be locked and interrupts must be disabled. |
1275 | * The address space must be locked and interrupts must be disabled. |
1276 | * |
1276 | * |
1277 | * @param as Address space. |
1277 | * @param as Address space. |
1278 | * @param va Starting virtual address of the area being tested. |
1278 | * @param va Starting virtual address of the area being tested. |
1279 | * @param size Size of the area being tested. |
1279 | * @param size Size of the area being tested. |
1280 | * @param avoid_area Do not touch this area. |
1280 | * @param avoid_area Do not touch this area. |
1281 | * |
1281 | * |
1282 | * @return True if there is no conflict, false otherwise. |
1282 | * @return True if there is no conflict, false otherwise. |
1283 | */ |
1283 | */ |
1284 | bool |
1284 | bool |
1285 | check_area_conflicts(as_t *as, uintptr_t va, size_t size, as_area_t *avoid_area) |
1285 | check_area_conflicts(as_t *as, uintptr_t va, size_t size, as_area_t *avoid_area) |
1286 | { |
1286 | { |
1287 | as_area_t *a; |
1287 | as_area_t *a; |
1288 | btree_node_t *leaf, *node; |
1288 | btree_node_t *leaf, *node; |
1289 | unsigned int i; |
1289 | unsigned int i; |
1290 | 1290 | ||
1291 | /* |
1291 | /* |
1292 | * We don't want any area to have conflicts with NULL page. |
1292 | * We don't want any area to have conflicts with NULL page. |
1293 | */ |
1293 | */ |
1294 | if (overlaps(va, size, NULL, PAGE_SIZE)) |
1294 | if (overlaps(va, size, NULL, PAGE_SIZE)) |
1295 | return false; |
1295 | return false; |
1296 | 1296 | ||
1297 | /* |
1297 | /* |
1298 | * The leaf node is found in O(log n), where n is proportional to |
1298 | * The leaf node is found in O(log n), where n is proportional to |
1299 | * the number of address space areas belonging to as. |
1299 | * the number of address space areas belonging to as. |
1300 | * The check for conflicts is then attempted on the rightmost |
1300 | * The check for conflicts is then attempted on the rightmost |
1301 | * record in the left neighbour, the leftmost record in the right |
1301 | * record in the left neighbour, the leftmost record in the right |
1302 | * neighbour and all records in the leaf node itself. |
1302 | * neighbour and all records in the leaf node itself. |
1303 | */ |
1303 | */ |
1304 | 1304 | ||
1305 | if ((a = (as_area_t *) btree_search(&as->as_area_btree, va, &leaf))) { |
1305 | if ((a = (as_area_t *) btree_search(&as->as_area_btree, va, &leaf))) { |
1306 | if (a != avoid_area) |
1306 | if (a != avoid_area) |
1307 | return false; |
1307 | return false; |
1308 | } |
1308 | } |
1309 | 1309 | ||
1310 | /* First, check the two border cases. */ |
1310 | /* First, check the two border cases. */ |
1311 | if ((node = btree_leaf_node_left_neighbour(&as->as_area_btree, leaf))) { |
1311 | if ((node = btree_leaf_node_left_neighbour(&as->as_area_btree, leaf))) { |
1312 | a = (as_area_t *) node->value[node->keys - 1]; |
1312 | a = (as_area_t *) node->value[node->keys - 1]; |
1313 | mutex_lock(&a->lock); |
1313 | mutex_lock(&a->lock); |
1314 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1314 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1315 | mutex_unlock(&a->lock); |
1315 | mutex_unlock(&a->lock); |
1316 | return false; |
1316 | return false; |
1317 | } |
1317 | } |
1318 | mutex_unlock(&a->lock); |
1318 | mutex_unlock(&a->lock); |
1319 | } |
1319 | } |
1320 | node = btree_leaf_node_right_neighbour(&as->as_area_btree, leaf); |
1320 | node = btree_leaf_node_right_neighbour(&as->as_area_btree, leaf); |
1321 | if (node) { |
1321 | if (node) { |
1322 | a = (as_area_t *) node->value[0]; |
1322 | a = (as_area_t *) node->value[0]; |
1323 | mutex_lock(&a->lock); |
1323 | mutex_lock(&a->lock); |
1324 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1324 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1325 | mutex_unlock(&a->lock); |
1325 | mutex_unlock(&a->lock); |
1326 | return false; |
1326 | return false; |
1327 | } |
1327 | } |
1328 | mutex_unlock(&a->lock); |
1328 | mutex_unlock(&a->lock); |
1329 | } |
1329 | } |
1330 | 1330 | ||
1331 | /* Second, check the leaf node. */ |
1331 | /* Second, check the leaf node. */ |
1332 | for (i = 0; i < leaf->keys; i++) { |
1332 | for (i = 0; i < leaf->keys; i++) { |
1333 | a = (as_area_t *) leaf->value[i]; |
1333 | a = (as_area_t *) leaf->value[i]; |
1334 | 1334 | ||
1335 | if (a == avoid_area) |
1335 | if (a == avoid_area) |
1336 | continue; |
1336 | continue; |
1337 | 1337 | ||
1338 | mutex_lock(&a->lock); |
1338 | mutex_lock(&a->lock); |
1339 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1339 | if (overlaps(va, size, a->base, a->pages * PAGE_SIZE)) { |
1340 | mutex_unlock(&a->lock); |
1340 | mutex_unlock(&a->lock); |
1341 | return false; |
1341 | return false; |
1342 | } |
1342 | } |
1343 | mutex_unlock(&a->lock); |
1343 | mutex_unlock(&a->lock); |
1344 | } |
1344 | } |
1345 | 1345 | ||
1346 | /* |
1346 | /* |
1347 | * So far, the area does not conflict with other areas. |
1347 | * So far, the area does not conflict with other areas. |
1348 | * Check if it doesn't conflict with kernel address space. |
1348 | * Check if it doesn't conflict with kernel address space. |
1349 | */ |
1349 | */ |
1350 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
1350 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
1351 | return !overlaps(va, size, |
1351 | return !overlaps(va, size, |
1352 | KERNEL_ADDRESS_SPACE_START, |
1352 | KERNEL_ADDRESS_SPACE_START, |
1353 | KERNEL_ADDRESS_SPACE_END - KERNEL_ADDRESS_SPACE_START); |
1353 | KERNEL_ADDRESS_SPACE_END - KERNEL_ADDRESS_SPACE_START); |
1354 | } |
1354 | } |
1355 | 1355 | ||
1356 | return true; |
1356 | return true; |
1357 | } |
1357 | } |
1358 | 1358 | ||
1359 | /** Return size of the address space area with given base. |
1359 | /** Return size of the address space area with given base. |
1360 | * |
1360 | * |
1361 | * @param base Arbitrary address insede the address space area. |
1361 | * @param base Arbitrary address insede the address space area. |
1362 | * |
1362 | * |
1363 | * @return Size of the address space area in bytes or zero if it |
1363 | * @return Size of the address space area in bytes or zero if it |
1364 | * does not exist. |
1364 | * does not exist. |
1365 | */ |
1365 | */ |
1366 | size_t as_area_get_size(uintptr_t base) |
1366 | size_t as_area_get_size(uintptr_t base) |
1367 | { |
1367 | { |
1368 | ipl_t ipl; |
1368 | ipl_t ipl; |
1369 | as_area_t *src_area; |
1369 | as_area_t *src_area; |
1370 | size_t size; |
1370 | size_t size; |
1371 | 1371 | ||
1372 | ipl = interrupts_disable(); |
1372 | ipl = interrupts_disable(); |
1373 | src_area = find_area_and_lock(AS, base); |
1373 | src_area = find_area_and_lock(AS, base); |
1374 | if (src_area) { |
1374 | if (src_area) { |
1375 | size = src_area->pages * PAGE_SIZE; |
1375 | size = src_area->pages * PAGE_SIZE; |
1376 | mutex_unlock(&src_area->lock); |
1376 | mutex_unlock(&src_area->lock); |
1377 | } else { |
1377 | } else { |
1378 | size = 0; |
1378 | size = 0; |
1379 | } |
1379 | } |
1380 | interrupts_restore(ipl); |
1380 | interrupts_restore(ipl); |
1381 | return size; |
1381 | return size; |
1382 | } |
1382 | } |
1383 | 1383 | ||
1384 | /** Mark portion of address space area as used. |
1384 | /** Mark portion of address space area as used. |
1385 | * |
1385 | * |
1386 | * The address space area must be already locked. |
1386 | * The address space area must be already locked. |
1387 | * |
1387 | * |
1388 | * @param a Address space area. |
1388 | * @param a Address space area. |
1389 | * @param page First page to be marked. |
1389 | * @param page First page to be marked. |
1390 | * @param count Number of page to be marked. |
1390 | * @param count Number of page to be marked. |
1391 | * |
1391 | * |
1392 | * @return Zero on failure and non-zero on success. |
1392 | * @return Zero on failure and non-zero on success. |
1393 | */ |
1393 | */ |
1394 | int used_space_insert(as_area_t *a, uintptr_t page, count_t count) |
1394 | int used_space_insert(as_area_t *a, uintptr_t page, count_t count) |
1395 | { |
1395 | { |
1396 | btree_node_t *leaf, *node; |
1396 | btree_node_t *leaf, *node; |
1397 | count_t pages; |
1397 | count_t pages; |
1398 | unsigned int i; |
1398 | unsigned int i; |
1399 | 1399 | ||
1400 | ASSERT(page == ALIGN_DOWN(page, PAGE_SIZE)); |
1400 | ASSERT(page == ALIGN_DOWN(page, PAGE_SIZE)); |
1401 | ASSERT(count); |
1401 | ASSERT(count); |
1402 | 1402 | ||
1403 | pages = (count_t) btree_search(&a->used_space, page, &leaf); |
1403 | pages = (count_t) btree_search(&a->used_space, page, &leaf); |
1404 | if (pages) { |
1404 | if (pages) { |
1405 | /* |
1405 | /* |
1406 | * We hit the beginning of some used space. |
1406 | * We hit the beginning of some used space. |
1407 | */ |
1407 | */ |
1408 | return 0; |
1408 | return 0; |
1409 | } |
1409 | } |
1410 | 1410 | ||
1411 | if (!leaf->keys) { |
1411 | if (!leaf->keys) { |
1412 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1412 | btree_insert(&a->used_space, page, (void *) count, leaf); |
1413 | return 1; |
1413 | return 1; |
1414 | } |
1414 | } |
1415 | 1415 | ||
1416 | node = btree_leaf_node_left_neighbour(&a->used_space, leaf); |
1416 | node = btree_leaf_node_left_neighbour(&a->used_space, leaf); |
1417 | if (node) { |
1417 | if (node) { |
1418 | uintptr_t left_pg = node->key[node->keys - 1]; |
1418 | uintptr_t left_pg = node->key[node->keys - 1]; |
1419 | uintptr_t right_pg = leaf->key[0]; |
1419 | uintptr_t right_pg = leaf->key[0]; |
1420 | count_t left_cnt = (count_t) node->value[node->keys - 1]; |
1420 | count_t left_cnt = (count_t) node->value[node->keys - 1]; |
1421 | count_t right_cnt = (count_t) leaf->value[0]; |
1421 | count_t right_cnt = (count_t) leaf->value[0]; |
1422 | 1422 | ||
1423 | /* |
1423 | /* |
1424 | * Examine the possibility that the interval fits |
1424 | * Examine the possibility that the interval fits |
1425 | * somewhere between the rightmost interval of |
1425 | * somewhere between the rightmost interval of |
1426 | * the left neigbour and the first interval of the leaf. |
1426 | * the left neigbour and the first interval of the leaf. |
1427 | */ |
1427 | */ |
1428 | 1428 | ||
1429 | if (page >= right_pg) { |
1429 | if (page >= right_pg) { |
1430 | /* Do nothing. */ |
1430 | /* Do nothing. */ |
1431 | } else if (overlaps(page, count * PAGE_SIZE, left_pg, |
1431 | } else if (overlaps(page, count * PAGE_SIZE, left_pg, |
1432 | left_cnt * PAGE_SIZE)) { |
1432 | left_cnt * PAGE_SIZE)) { |
1433 | /* The interval intersects with the left interval. */ |
1433 | /* The interval intersects with the left interval. */ |
1434 | return 0; |
1434 | return 0; |
1435 | } else if (overlaps(page, count * PAGE_SIZE, right_pg, |
1435 | } else if (overlaps(page, count * PAGE_SIZE, right_pg, |
1436 | right_cnt * PAGE_SIZE)) { |
1436 | right_cnt * PAGE_SIZE)) { |
1437 | /* The interval intersects with the right interval. */ |
1437 | /* The interval intersects with the right interval. */ |
1438 | return 0; |
1438 | return 0; |
1439 | } else if ((page == left_pg + left_cnt * PAGE_SIZE) && |
1439 | } else if ((page == left_pg + left_cnt * PAGE_SIZE) && |
1440 | (page + count * PAGE_SIZE == right_pg)) { |
1440 | (page + count * PAGE_SIZE == right_pg)) { |
1441 | /* |
1441 | /* |
1442 | * The interval can be added by merging the two already |
1442 | * The interval can be added by merging the two already |
1443 | * present intervals. |
1443 | * present intervals. |
1444 | */ |
1444 | */ |
1445 | node->value[node->keys - 1] += count + right_cnt; |
1445 | node->value[node->keys - 1] += count + right_cnt; |
1446 | btree_remove(&a->used_space, right_pg, leaf); |
1446 | btree_remove(&a->used_space, right_pg, leaf); |
1447 | return 1; |
1447 | return 1; |
1448 | } else if (page == left_pg + left_cnt * PAGE_SIZE) { |
1448 | } else if (page == left_pg + left_cnt * PAGE_SIZE) { |
1449 | /* |
1449 | /* |
1450 | * The interval can be added by simply growing the left |
1450 | * The interval can be added by simply growing the left |
1451 | * interval. |
1451 | * interval. |
1452 | */ |
1452 | */ |
1453 | node->value[node->keys - 1] += count; |
1453 | node->value[node->keys - 1] += count; |
1454 | return 1; |
1454 | return 1; |
1455 | } else if (page + count * PAGE_SIZE == right_pg) { |
1455 | } else if (page + count * PAGE_SIZE == right_pg) { |
1456 | /* |
1456 | /* |
1457 | * The interval can be addded by simply moving base of |
1457 | * The interval can be addded by simply moving base of |
1458 | * the right interval down and increasing its size |
1458 | * the right interval down and increasing its size |
1459 | * accordingly. |
1459 | * accordingly. |
1460 | */ |
1460 | */ |
1461 | leaf->value[0] += count; |
1461 | leaf->value[0] += count; |
1462 | leaf->key[0] = page; |
1462 | leaf->key[0] = page; |
1463 | return 1; |
1463 | return 1; |
1464 | } else { |
1464 | } else { |
1465 | /* |
1465 | /* |
1466 | * The interval is between both neigbouring intervals, |
1466 | * The interval is between both neigbouring intervals, |
1467 | * but cannot be merged with any of them. |
1467 | * but cannot be merged with any of them. |
1468 | */ |
1468 | */ |
1469 | btree_insert(&a->used_space, page, (void *) count, |
1469 | btree_insert(&a->used_space, page, (void *) count, |
1470 | leaf); |
1470 | leaf); |
1471 | return 1; |
1471 | return 1; |
1472 | } |
1472 | } |
1473 | } else if (page < leaf->key[0]) { |
1473 | } else if (page < leaf->key[0]) { |
1474 | uintptr_t right_pg = leaf->key[0]; |
1474 | uintptr_t right_pg = leaf->key[0]; |
1475 | count_t right_cnt = (count_t) leaf->value[0]; |
1475 | count_t right_cnt = (count_t) leaf->value[0]; |
1476 | 1476 | ||
1477 | /* |
1477 | /* |
1478 | * Investigate the border case in which the left neighbour does |
1478 | * Investigate the border case in which the left neighbour does |
1479 | * not exist but the interval fits from the left. |
1479 | * not exist but the interval fits from the left. |
1480 | */ |
1480 | */ |
1481 | 1481 | ||
1482 | if (overlaps(page, count * PAGE_SIZE, right_pg, |
1482 | if (overlaps(page, count * PAGE_SIZE, right_pg, |
1483 | right_cnt * PAGE_SIZE)) { |
1483 | right_cnt * PAGE_SIZE)) { |
1484 | /* The interval intersects with the right interval. */ |
1484 | /* The interval intersects with the right interval. */ |
1485 | return 0; |
1485 | return 0; |
1486 | } else if (page + count * PAGE_SIZE == right_pg) { |
1486 | } else if (page + count * PAGE_SIZE == right_pg) { |
1487 | /* |
1487 | /* |
1488 | * The interval can be added by moving the base of the |
1488 | * The interval can be added by moving the base of the |
1489 | * right interval down and increasing its size |
1489 | * right interval down and increasing its size |
1490 | * accordingly. |
1490 | * accordingly. |
1491 | */ |
1491 | */ |
1492 | leaf->key[0] = page; |
1492 | leaf->key[0] = page; |
1493 | leaf->value[0] += count; |
1493 | leaf->value[0] += count; |
1494 | return 1; |
1494 | return 1; |
1495 | } else { |
1495 | } else { |
1496 | /* |
1496 | /* |
1497 | * The interval doesn't adjoin with the right interval. |
1497 | * The interval doesn't adjoin with the right interval. |
1498 | * It must be added individually. |
1498 | * It must be added individually. |
1499 | */ |
1499 | */ |
1500 | btree_insert(&a->used_space, page, (void *) count, |
1500 | btree_insert(&a->used_space, page, (void *) count, |
1501 | leaf); |
1501 | leaf); |
1502 | return 1; |
1502 | return 1; |
1503 | } |
1503 | } |
1504 | } |
1504 | } |
1505 | 1505 | ||
1506 | node = btree_leaf_node_right_neighbour(&a->used_space, leaf); |
1506 | node = btree_leaf_node_right_neighbour(&a->used_space, leaf); |
1507 | if (node) { |
1507 | if (node) { |
1508 | uintptr_t left_pg = leaf->key[leaf->keys - 1]; |
1508 | uintptr_t left_pg = leaf->key[leaf->keys - 1]; |
1509 | uintptr_t right_pg = node->key[0]; |
1509 | uintptr_t right_pg = node->key[0]; |
1510 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1510 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1511 | count_t right_cnt = (count_t) node->value[0]; |
1511 | count_t right_cnt = (count_t) node->value[0]; |
1512 | 1512 | ||
1513 | /* |
1513 | /* |
1514 | * Examine the possibility that the interval fits |
1514 | * Examine the possibility that the interval fits |
1515 | * somewhere between the leftmost interval of |
1515 | * somewhere between the leftmost interval of |
1516 | * the right neigbour and the last interval of the leaf. |
1516 | * the right neigbour and the last interval of the leaf. |
1517 | */ |
1517 | */ |
1518 | 1518 | ||
1519 | if (page < left_pg) { |
1519 | if (page < left_pg) { |
1520 | /* Do nothing. */ |
1520 | /* Do nothing. */ |
1521 | } else if (overlaps(page, count * PAGE_SIZE, left_pg, |
1521 | } else if (overlaps(page, count * PAGE_SIZE, left_pg, |
1522 | left_cnt * PAGE_SIZE)) { |
1522 | left_cnt * PAGE_SIZE)) { |
1523 | /* The interval intersects with the left interval. */ |
1523 | /* The interval intersects with the left interval. */ |
1524 | return 0; |
1524 | return 0; |
1525 | } else if (overlaps(page, count * PAGE_SIZE, right_pg, |
1525 | } else if (overlaps(page, count * PAGE_SIZE, right_pg, |
1526 | right_cnt * PAGE_SIZE)) { |
1526 | right_cnt * PAGE_SIZE)) { |
1527 | /* The interval intersects with the right interval. */ |
1527 | /* The interval intersects with the right interval. */ |
1528 | return 0; |
1528 | return 0; |
1529 | } else if ((page == left_pg + left_cnt * PAGE_SIZE) && |
1529 | } else if ((page == left_pg + left_cnt * PAGE_SIZE) && |
1530 | (page + count * PAGE_SIZE == right_pg)) { |
1530 | (page + count * PAGE_SIZE == right_pg)) { |
1531 | /* |
1531 | /* |
1532 | * The interval can be added by merging the two already |
1532 | * The interval can be added by merging the two already |
1533 | * present intervals. |
1533 | * present intervals. |
1534 | * */ |
1534 | * */ |
1535 | leaf->value[leaf->keys - 1] += count + right_cnt; |
1535 | leaf->value[leaf->keys - 1] += count + right_cnt; |
1536 | btree_remove(&a->used_space, right_pg, node); |
1536 | btree_remove(&a->used_space, right_pg, node); |
1537 | return 1; |
1537 | return 1; |
1538 | } else if (page == left_pg + left_cnt * PAGE_SIZE) { |
1538 | } else if (page == left_pg + left_cnt * PAGE_SIZE) { |
1539 | /* |
1539 | /* |
1540 | * The interval can be added by simply growing the left |
1540 | * The interval can be added by simply growing the left |
1541 | * interval. |
1541 | * interval. |
1542 | * */ |
1542 | * */ |
1543 | leaf->value[leaf->keys - 1] += count; |
1543 | leaf->value[leaf->keys - 1] += count; |
1544 | return 1; |
1544 | return 1; |
1545 | } else if (page + count * PAGE_SIZE == right_pg) { |
1545 | } else if (page + count * PAGE_SIZE == right_pg) { |
1546 | /* |
1546 | /* |
1547 | * The interval can be addded by simply moving base of |
1547 | * The interval can be addded by simply moving base of |
1548 | * the right interval down and increasing its size |
1548 | * the right interval down and increasing its size |
1549 | * accordingly. |
1549 | * accordingly. |
1550 | */ |
1550 | */ |
1551 | node->value[0] += count; |
1551 | node->value[0] += count; |
1552 | node->key[0] = page; |
1552 | node->key[0] = page; |
1553 | return 1; |
1553 | return 1; |
1554 | } else { |
1554 | } else { |
1555 | /* |
1555 | /* |
1556 | * The interval is between both neigbouring intervals, |
1556 | * The interval is between both neigbouring intervals, |
1557 | * but cannot be merged with any of them. |
1557 | * but cannot be merged with any of them. |
1558 | */ |
1558 | */ |
1559 | btree_insert(&a->used_space, page, (void *) count, |
1559 | btree_insert(&a->used_space, page, (void *) count, |
1560 | leaf); |
1560 | leaf); |
1561 | return 1; |
1561 | return 1; |
1562 | } |
1562 | } |
1563 | } else if (page >= leaf->key[leaf->keys - 1]) { |
1563 | } else if (page >= leaf->key[leaf->keys - 1]) { |
1564 | uintptr_t left_pg = leaf->key[leaf->keys - 1]; |
1564 | uintptr_t left_pg = leaf->key[leaf->keys - 1]; |
1565 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1565 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1566 | 1566 | ||
1567 | /* |
1567 | /* |
1568 | * Investigate the border case in which the right neighbour |
1568 | * Investigate the border case in which the right neighbour |
1569 | * does not exist but the interval fits from the right. |
1569 | * does not exist but the interval fits from the right. |
1570 | */ |
1570 | */ |
1571 | 1571 | ||
1572 | if (overlaps(page, count * PAGE_SIZE, left_pg, |
1572 | if (overlaps(page, count * PAGE_SIZE, left_pg, |
1573 | left_cnt * PAGE_SIZE)) { |
1573 | left_cnt * PAGE_SIZE)) { |
1574 | /* The interval intersects with the left interval. */ |
1574 | /* The interval intersects with the left interval. */ |
1575 | return 0; |
1575 | return 0; |
1576 | } else if (left_pg + left_cnt * PAGE_SIZE == page) { |
1576 | } else if (left_pg + left_cnt * PAGE_SIZE == page) { |
1577 | /* |
1577 | /* |
1578 | * The interval can be added by growing the left |
1578 | * The interval can be added by growing the left |
1579 | * interval. |
1579 | * interval. |
1580 | */ |
1580 | */ |
1581 | leaf->value[leaf->keys - 1] += count; |
1581 | leaf->value[leaf->keys - 1] += count; |
1582 | return 1; |
1582 | return 1; |
1583 | } else { |
1583 | } else { |
1584 | /* |
1584 | /* |
1585 | * The interval doesn't adjoin with the left interval. |
1585 | * The interval doesn't adjoin with the left interval. |
1586 | * It must be added individually. |
1586 | * It must be added individually. |
1587 | */ |
1587 | */ |
1588 | btree_insert(&a->used_space, page, (void *) count, |
1588 | btree_insert(&a->used_space, page, (void *) count, |
1589 | leaf); |
1589 | leaf); |
1590 | return 1; |
1590 | return 1; |
1591 | } |
1591 | } |
1592 | } |
1592 | } |
1593 | 1593 | ||
1594 | /* |
1594 | /* |
1595 | * Note that if the algorithm made it thus far, the interval can fit |
1595 | * Note that if the algorithm made it thus far, the interval can fit |
1596 | * only between two other intervals of the leaf. The two border cases |
1596 | * only between two other intervals of the leaf. The two border cases |
1597 | * were already resolved. |
1597 | * were already resolved. |
1598 | */ |
1598 | */ |
1599 | for (i = 1; i < leaf->keys; i++) { |
1599 | for (i = 1; i < leaf->keys; i++) { |
1600 | if (page < leaf->key[i]) { |
1600 | if (page < leaf->key[i]) { |
1601 | uintptr_t left_pg = leaf->key[i - 1]; |
1601 | uintptr_t left_pg = leaf->key[i - 1]; |
1602 | uintptr_t right_pg = leaf->key[i]; |
1602 | uintptr_t right_pg = leaf->key[i]; |
1603 | count_t left_cnt = (count_t) leaf->value[i - 1]; |
1603 | count_t left_cnt = (count_t) leaf->value[i - 1]; |
1604 | count_t right_cnt = (count_t) leaf->value[i]; |
1604 | count_t right_cnt = (count_t) leaf->value[i]; |
1605 | 1605 | ||
1606 | /* |
1606 | /* |
1607 | * The interval fits between left_pg and right_pg. |
1607 | * The interval fits between left_pg and right_pg. |
1608 | */ |
1608 | */ |
1609 | 1609 | ||
1610 | if (overlaps(page, count * PAGE_SIZE, left_pg, |
1610 | if (overlaps(page, count * PAGE_SIZE, left_pg, |
1611 | left_cnt * PAGE_SIZE)) { |
1611 | left_cnt * PAGE_SIZE)) { |
1612 | /* |
1612 | /* |
1613 | * The interval intersects with the left |
1613 | * The interval intersects with the left |
1614 | * interval. |
1614 | * interval. |
1615 | */ |
1615 | */ |
1616 | return 0; |
1616 | return 0; |
1617 | } else if (overlaps(page, count * PAGE_SIZE, right_pg, |
1617 | } else if (overlaps(page, count * PAGE_SIZE, right_pg, |
1618 | right_cnt * PAGE_SIZE)) { |
1618 | right_cnt * PAGE_SIZE)) { |
1619 | /* |
1619 | /* |
1620 | * The interval intersects with the right |
1620 | * The interval intersects with the right |
1621 | * interval. |
1621 | * interval. |
1622 | */ |
1622 | */ |
1623 | return 0; |
1623 | return 0; |
1624 | } else if ((page == left_pg + left_cnt * PAGE_SIZE) && |
1624 | } else if ((page == left_pg + left_cnt * PAGE_SIZE) && |
1625 | (page + count * PAGE_SIZE == right_pg)) { |
1625 | (page + count * PAGE_SIZE == right_pg)) { |
1626 | /* |
1626 | /* |
1627 | * The interval can be added by merging the two |
1627 | * The interval can be added by merging the two |
1628 | * already present intervals. |
1628 | * already present intervals. |
1629 | */ |
1629 | */ |
1630 | leaf->value[i - 1] += count + right_cnt; |
1630 | leaf->value[i - 1] += count + right_cnt; |
1631 | btree_remove(&a->used_space, right_pg, leaf); |
1631 | btree_remove(&a->used_space, right_pg, leaf); |
1632 | return 1; |
1632 | return 1; |
1633 | } else if (page == left_pg + left_cnt * PAGE_SIZE) { |
1633 | } else if (page == left_pg + left_cnt * PAGE_SIZE) { |
1634 | /* |
1634 | /* |
1635 | * The interval can be added by simply growing |
1635 | * The interval can be added by simply growing |
1636 | * the left interval. |
1636 | * the left interval. |
1637 | */ |
1637 | */ |
1638 | leaf->value[i - 1] += count; |
1638 | leaf->value[i - 1] += count; |
1639 | return 1; |
1639 | return 1; |
1640 | } else if (page + count * PAGE_SIZE == right_pg) { |
1640 | } else if (page + count * PAGE_SIZE == right_pg) { |
1641 | /* |
1641 | /* |
1642 | * The interval can be addded by simply moving |
1642 | * The interval can be addded by simply moving |
1643 | * base of the right interval down and |
1643 | * base of the right interval down and |
1644 | * increasing its size accordingly. |
1644 | * increasing its size accordingly. |
1645 | */ |
1645 | */ |
1646 | leaf->value[i] += count; |
1646 | leaf->value[i] += count; |
1647 | leaf->key[i] = page; |
1647 | leaf->key[i] = page; |
1648 | return 1; |
1648 | return 1; |
1649 | } else { |
1649 | } else { |
1650 | /* |
1650 | /* |
1651 | * The interval is between both neigbouring |
1651 | * The interval is between both neigbouring |
1652 | * intervals, but cannot be merged with any of |
1652 | * intervals, but cannot be merged with any of |
1653 | * them. |
1653 | * them. |
1654 | */ |
1654 | */ |
1655 | btree_insert(&a->used_space, page, |
1655 | btree_insert(&a->used_space, page, |
1656 | (void *) count, leaf); |
1656 | (void *) count, leaf); |
1657 | return 1; |
1657 | return 1; |
1658 | } |
1658 | } |
1659 | } |
1659 | } |
1660 | } |
1660 | } |
1661 | 1661 | ||
1662 | panic("Inconsistency detected while adding %" PRIc " pages of used " |
1662 | panic("Inconsistency detected while adding %" PRIc " pages of used " |
1663 | "space at %p.\n", count, page); |
1663 | "space at %p.\n", count, page); |
1664 | } |
1664 | } |
1665 | 1665 | ||
1666 | /** Mark portion of address space area as unused. |
1666 | /** Mark portion of address space area as unused. |
1667 | * |
1667 | * |
1668 | * The address space area must be already locked. |
1668 | * The address space area must be already locked. |
1669 | * |
1669 | * |
1670 | * @param a Address space area. |
1670 | * @param a Address space area. |
1671 | * @param page First page to be marked. |
1671 | * @param page First page to be marked. |
1672 | * @param count Number of page to be marked. |
1672 | * @param count Number of page to be marked. |
1673 | * |
1673 | * |
1674 | * @return Zero on failure and non-zero on success. |
1674 | * @return Zero on failure and non-zero on success. |
1675 | */ |
1675 | */ |
1676 | int used_space_remove(as_area_t *a, uintptr_t page, count_t count) |
1676 | int used_space_remove(as_area_t *a, uintptr_t page, count_t count) |
1677 | { |
1677 | { |
1678 | btree_node_t *leaf, *node; |
1678 | btree_node_t *leaf, *node; |
1679 | count_t pages; |
1679 | count_t pages; |
1680 | unsigned int i; |
1680 | unsigned int i; |
1681 | 1681 | ||
1682 | ASSERT(page == ALIGN_DOWN(page, PAGE_SIZE)); |
1682 | ASSERT(page == ALIGN_DOWN(page, PAGE_SIZE)); |
1683 | ASSERT(count); |
1683 | ASSERT(count); |
1684 | 1684 | ||
1685 | pages = (count_t) btree_search(&a->used_space, page, &leaf); |
1685 | pages = (count_t) btree_search(&a->used_space, page, &leaf); |
1686 | if (pages) { |
1686 | if (pages) { |
1687 | /* |
1687 | /* |
1688 | * We are lucky, page is the beginning of some interval. |
1688 | * We are lucky, page is the beginning of some interval. |
1689 | */ |
1689 | */ |
1690 | if (count > pages) { |
1690 | if (count > pages) { |
1691 | return 0; |
1691 | return 0; |
1692 | } else if (count == pages) { |
1692 | } else if (count == pages) { |
1693 | btree_remove(&a->used_space, page, leaf); |
1693 | btree_remove(&a->used_space, page, leaf); |
1694 | return 1; |
1694 | return 1; |
1695 | } else { |
1695 | } else { |
1696 | /* |
1696 | /* |
1697 | * Find the respective interval. |
1697 | * Find the respective interval. |
1698 | * Decrease its size and relocate its start address. |
1698 | * Decrease its size and relocate its start address. |
1699 | */ |
1699 | */ |
1700 | for (i = 0; i < leaf->keys; i++) { |
1700 | for (i = 0; i < leaf->keys; i++) { |
1701 | if (leaf->key[i] == page) { |
1701 | if (leaf->key[i] == page) { |
1702 | leaf->key[i] += count * PAGE_SIZE; |
1702 | leaf->key[i] += count * PAGE_SIZE; |
1703 | leaf->value[i] -= count; |
1703 | leaf->value[i] -= count; |
1704 | return 1; |
1704 | return 1; |
1705 | } |
1705 | } |
1706 | } |
1706 | } |
1707 | goto error; |
1707 | goto error; |
1708 | } |
1708 | } |
1709 | } |
1709 | } |
1710 | 1710 | ||
1711 | node = btree_leaf_node_left_neighbour(&a->used_space, leaf); |
1711 | node = btree_leaf_node_left_neighbour(&a->used_space, leaf); |
1712 | if (node && page < leaf->key[0]) { |
1712 | if (node && page < leaf->key[0]) { |
1713 | uintptr_t left_pg = node->key[node->keys - 1]; |
1713 | uintptr_t left_pg = node->key[node->keys - 1]; |
1714 | count_t left_cnt = (count_t) node->value[node->keys - 1]; |
1714 | count_t left_cnt = (count_t) node->value[node->keys - 1]; |
1715 | 1715 | ||
1716 | if (overlaps(left_pg, left_cnt * PAGE_SIZE, page, |
1716 | if (overlaps(left_pg, left_cnt * PAGE_SIZE, page, |
1717 | count * PAGE_SIZE)) { |
1717 | count * PAGE_SIZE)) { |
1718 | if (page + count * PAGE_SIZE == |
1718 | if (page + count * PAGE_SIZE == |
1719 | left_pg + left_cnt * PAGE_SIZE) { |
1719 | left_pg + left_cnt * PAGE_SIZE) { |
1720 | /* |
1720 | /* |
1721 | * The interval is contained in the rightmost |
1721 | * The interval is contained in the rightmost |
1722 | * interval of the left neighbour and can be |
1722 | * interval of the left neighbour and can be |
1723 | * removed by updating the size of the bigger |
1723 | * removed by updating the size of the bigger |
1724 | * interval. |
1724 | * interval. |
1725 | */ |
1725 | */ |
1726 | node->value[node->keys - 1] -= count; |
1726 | node->value[node->keys - 1] -= count; |
1727 | return 1; |
1727 | return 1; |
1728 | } else if (page + count * PAGE_SIZE < |
1728 | } else if (page + count * PAGE_SIZE < |
1729 | left_pg + left_cnt*PAGE_SIZE) { |
1729 | left_pg + left_cnt*PAGE_SIZE) { |
1730 | count_t new_cnt; |
1730 | count_t new_cnt; |
1731 | 1731 | ||
1732 | /* |
1732 | /* |
1733 | * The interval is contained in the rightmost |
1733 | * The interval is contained in the rightmost |
1734 | * interval of the left neighbour but its |
1734 | * interval of the left neighbour but its |
1735 | * removal requires both updating the size of |
1735 | * removal requires both updating the size of |
1736 | * the original interval and also inserting a |
1736 | * the original interval and also inserting a |
1737 | * new interval. |
1737 | * new interval. |
1738 | */ |
1738 | */ |
1739 | new_cnt = ((left_pg + left_cnt * PAGE_SIZE) - |
1739 | new_cnt = ((left_pg + left_cnt * PAGE_SIZE) - |
1740 | (page + count*PAGE_SIZE)) >> PAGE_WIDTH; |
1740 | (page + count*PAGE_SIZE)) >> PAGE_WIDTH; |
1741 | node->value[node->keys - 1] -= count + new_cnt; |
1741 | node->value[node->keys - 1] -= count + new_cnt; |
1742 | btree_insert(&a->used_space, page + |
1742 | btree_insert(&a->used_space, page + |
1743 | count * PAGE_SIZE, (void *) new_cnt, leaf); |
1743 | count * PAGE_SIZE, (void *) new_cnt, leaf); |
1744 | return 1; |
1744 | return 1; |
1745 | } |
1745 | } |
1746 | } |
1746 | } |
1747 | return 0; |
1747 | return 0; |
1748 | } else if (page < leaf->key[0]) { |
1748 | } else if (page < leaf->key[0]) { |
1749 | return 0; |
1749 | return 0; |
1750 | } |
1750 | } |
1751 | 1751 | ||
1752 | if (page > leaf->key[leaf->keys - 1]) { |
1752 | if (page > leaf->key[leaf->keys - 1]) { |
1753 | uintptr_t left_pg = leaf->key[leaf->keys - 1]; |
1753 | uintptr_t left_pg = leaf->key[leaf->keys - 1]; |
1754 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1754 | count_t left_cnt = (count_t) leaf->value[leaf->keys - 1]; |
1755 | 1755 | ||
1756 | if (overlaps(left_pg, left_cnt * PAGE_SIZE, page, |
1756 | if (overlaps(left_pg, left_cnt * PAGE_SIZE, page, |
1757 | count * PAGE_SIZE)) { |
1757 | count * PAGE_SIZE)) { |
1758 | if (page + count * PAGE_SIZE == |
1758 | if (page + count * PAGE_SIZE == |
1759 | left_pg + left_cnt * PAGE_SIZE) { |
1759 | left_pg + left_cnt * PAGE_SIZE) { |
1760 | /* |
1760 | /* |
1761 | * The interval is contained in the rightmost |
1761 | * The interval is contained in the rightmost |
1762 | * interval of the leaf and can be removed by |
1762 | * interval of the leaf and can be removed by |
1763 | * updating the size of the bigger interval. |
1763 | * updating the size of the bigger interval. |
1764 | */ |
1764 | */ |
1765 | leaf->value[leaf->keys - 1] -= count; |
1765 | leaf->value[leaf->keys - 1] -= count; |
1766 | return 1; |
1766 | return 1; |
1767 | } else if (page + count * PAGE_SIZE < left_pg + |
1767 | } else if (page + count * PAGE_SIZE < left_pg + |
1768 | left_cnt * PAGE_SIZE) { |
1768 | left_cnt * PAGE_SIZE) { |
1769 | count_t new_cnt; |
1769 | count_t new_cnt; |
1770 | 1770 | ||
1771 | /* |
1771 | /* |
1772 | * The interval is contained in the rightmost |
1772 | * The interval is contained in the rightmost |
1773 | * interval of the leaf but its removal |
1773 | * interval of the leaf but its removal |
1774 | * requires both updating the size of the |
1774 | * requires both updating the size of the |
1775 | * original interval and also inserting a new |
1775 | * original interval and also inserting a new |
1776 | * interval. |
1776 | * interval. |
1777 | */ |
1777 | */ |
1778 | new_cnt = ((left_pg + left_cnt * PAGE_SIZE) - |
1778 | new_cnt = ((left_pg + left_cnt * PAGE_SIZE) - |
1779 | (page + count * PAGE_SIZE)) >> PAGE_WIDTH; |
1779 | (page + count * PAGE_SIZE)) >> PAGE_WIDTH; |
1780 | leaf->value[leaf->keys - 1] -= count + new_cnt; |
1780 | leaf->value[leaf->keys - 1] -= count + new_cnt; |
1781 | btree_insert(&a->used_space, page + |
1781 | btree_insert(&a->used_space, page + |
1782 | count * PAGE_SIZE, (void *) new_cnt, leaf); |
1782 | count * PAGE_SIZE, (void *) new_cnt, leaf); |
1783 | return 1; |
1783 | return 1; |
1784 | } |
1784 | } |
1785 | } |
1785 | } |
1786 | return 0; |
1786 | return 0; |
1787 | } |
1787 | } |
1788 | 1788 | ||
1789 | /* |
1789 | /* |
1790 | * The border cases have been already resolved. |
1790 | * The border cases have been already resolved. |
1791 | * Now the interval can be only between intervals of the leaf. |
1791 | * Now the interval can be only between intervals of the leaf. |
1792 | */ |
1792 | */ |
1793 | for (i = 1; i < leaf->keys - 1; i++) { |
1793 | for (i = 1; i < leaf->keys - 1; i++) { |
1794 | if (page < leaf->key[i]) { |
1794 | if (page < leaf->key[i]) { |
1795 | uintptr_t left_pg = leaf->key[i - 1]; |
1795 | uintptr_t left_pg = leaf->key[i - 1]; |
1796 | count_t left_cnt = (count_t) leaf->value[i - 1]; |
1796 | count_t left_cnt = (count_t) leaf->value[i - 1]; |
1797 | 1797 | ||
1798 | /* |
1798 | /* |
1799 | * Now the interval is between intervals corresponding |
1799 | * Now the interval is between intervals corresponding |
1800 | * to (i - 1) and i. |
1800 | * to (i - 1) and i. |
1801 | */ |
1801 | */ |
1802 | if (overlaps(left_pg, left_cnt * PAGE_SIZE, page, |
1802 | if (overlaps(left_pg, left_cnt * PAGE_SIZE, page, |
1803 | count * PAGE_SIZE)) { |
1803 | count * PAGE_SIZE)) { |
1804 | if (page + count * PAGE_SIZE == |
1804 | if (page + count * PAGE_SIZE == |
1805 | left_pg + left_cnt*PAGE_SIZE) { |
1805 | left_pg + left_cnt*PAGE_SIZE) { |
1806 | /* |
1806 | /* |
1807 | * The interval is contained in the |
1807 | * The interval is contained in the |
1808 | * interval (i - 1) of the leaf and can |
1808 | * interval (i - 1) of the leaf and can |
1809 | * be removed by updating the size of |
1809 | * be removed by updating the size of |
1810 | * the bigger interval. |
1810 | * the bigger interval. |
1811 | */ |
1811 | */ |
1812 | leaf->value[i - 1] -= count; |
1812 | leaf->value[i - 1] -= count; |
1813 | return 1; |
1813 | return 1; |
1814 | } else if (page + count * PAGE_SIZE < |
1814 | } else if (page + count * PAGE_SIZE < |
1815 | left_pg + left_cnt * PAGE_SIZE) { |
1815 | left_pg + left_cnt * PAGE_SIZE) { |
1816 | count_t new_cnt; |
1816 | count_t new_cnt; |
1817 | 1817 | ||
1818 | /* |
1818 | /* |
1819 | * The interval is contained in the |
1819 | * The interval is contained in the |
1820 | * interval (i - 1) of the leaf but its |
1820 | * interval (i - 1) of the leaf but its |
1821 | * removal requires both updating the |
1821 | * removal requires both updating the |
1822 | * size of the original interval and |
1822 | * size of the original interval and |
1823 | * also inserting a new interval. |
1823 | * also inserting a new interval. |
1824 | */ |
1824 | */ |
1825 | new_cnt = ((left_pg + |
1825 | new_cnt = ((left_pg + |
1826 | left_cnt * PAGE_SIZE) - |
1826 | left_cnt * PAGE_SIZE) - |
1827 | (page + count * PAGE_SIZE)) >> |
1827 | (page + count * PAGE_SIZE)) >> |
1828 | PAGE_WIDTH; |
1828 | PAGE_WIDTH; |
1829 | leaf->value[i - 1] -= count + new_cnt; |
1829 | leaf->value[i - 1] -= count + new_cnt; |
1830 | btree_insert(&a->used_space, page + |
1830 | btree_insert(&a->used_space, page + |
1831 | count * PAGE_SIZE, (void *) new_cnt, |
1831 | count * PAGE_SIZE, (void *) new_cnt, |
1832 | leaf); |
1832 | leaf); |
1833 | return 1; |
1833 | return 1; |
1834 | } |
1834 | } |
1835 | } |
1835 | } |
1836 | return 0; |
1836 | return 0; |
1837 | } |
1837 | } |
1838 | } |
1838 | } |
1839 | 1839 | ||
1840 | error: |
1840 | error: |
1841 | panic("Inconsistency detected while removing %" PRIc " pages of used " |
1841 | panic("Inconsistency detected while removing %" PRIc " pages of used " |
1842 | "space from %p.\n", count, page); |
1842 | "space from %p.\n", count, page); |
1843 | } |
1843 | } |
1844 | 1844 | ||
1845 | /** Remove reference to address space area share info. |
1845 | /** Remove reference to address space area share info. |
1846 | * |
1846 | * |
1847 | * If the reference count drops to 0, the sh_info is deallocated. |
1847 | * If the reference count drops to 0, the sh_info is deallocated. |
1848 | * |
1848 | * |
1849 | * @param sh_info Pointer to address space area share info. |
1849 | * @param sh_info Pointer to address space area share info. |
1850 | */ |
1850 | */ |
1851 | void sh_info_remove_reference(share_info_t *sh_info) |
1851 | void sh_info_remove_reference(share_info_t *sh_info) |
1852 | { |
1852 | { |
1853 | bool dealloc = false; |
1853 | bool dealloc = false; |
1854 | 1854 | ||
1855 | mutex_lock(&sh_info->lock); |
1855 | mutex_lock(&sh_info->lock); |
1856 | ASSERT(sh_info->refcount); |
1856 | ASSERT(sh_info->refcount); |
1857 | if (--sh_info->refcount == 0) { |
1857 | if (--sh_info->refcount == 0) { |
1858 | dealloc = true; |
1858 | dealloc = true; |
1859 | link_t *cur; |
1859 | link_t *cur; |
1860 | 1860 | ||
1861 | /* |
1861 | /* |
1862 | * Now walk carefully the pagemap B+tree and free/remove |
1862 | * Now walk carefully the pagemap B+tree and free/remove |
1863 | * reference from all frames found there. |
1863 | * reference from all frames found there. |
1864 | */ |
1864 | */ |
1865 | for (cur = sh_info->pagemap.leaf_head.next; |
1865 | for (cur = sh_info->pagemap.leaf_head.next; |
1866 | cur != &sh_info->pagemap.leaf_head; cur = cur->next) { |
1866 | cur != &sh_info->pagemap.leaf_head; cur = cur->next) { |
1867 | btree_node_t *node; |
1867 | btree_node_t *node; |
1868 | unsigned int i; |
1868 | unsigned int i; |
1869 | 1869 | ||
1870 | node = list_get_instance(cur, btree_node_t, leaf_link); |
1870 | node = list_get_instance(cur, btree_node_t, leaf_link); |
1871 | for (i = 0; i < node->keys; i++) |
1871 | for (i = 0; i < node->keys; i++) |
1872 | frame_free((uintptr_t) node->value[i]); |
1872 | frame_free((uintptr_t) node->value[i]); |
1873 | } |
1873 | } |
1874 | 1874 | ||
1875 | } |
1875 | } |
1876 | mutex_unlock(&sh_info->lock); |
1876 | mutex_unlock(&sh_info->lock); |
1877 | 1877 | ||
1878 | if (dealloc) { |
1878 | if (dealloc) { |
1879 | btree_destroy(&sh_info->pagemap); |
1879 | btree_destroy(&sh_info->pagemap); |
1880 | free(sh_info); |
1880 | free(sh_info); |
1881 | } |
1881 | } |
1882 | } |
1882 | } |
1883 | 1883 | ||
1884 | /* |
1884 | /* |
1885 | * Address space related syscalls. |
1885 | * Address space related syscalls. |
1886 | */ |
1886 | */ |
1887 | 1887 | ||
1888 | /** Wrapper for as_area_create(). */ |
1888 | /** Wrapper for as_area_create(). */ |
1889 | unative_t sys_as_area_create(uintptr_t address, size_t size, int flags) |
1889 | unative_t sys_as_area_create(uintptr_t address, size_t size, int flags) |
1890 | { |
1890 | { |
1891 | if (as_area_create(AS, flags | AS_AREA_CACHEABLE, size, address, |
1891 | if (as_area_create(AS, flags | AS_AREA_CACHEABLE, size, address, |
1892 | AS_AREA_ATTR_NONE, &anon_backend, NULL)) |
1892 | AS_AREA_ATTR_NONE, &anon_backend, NULL)) |
1893 | return (unative_t) address; |
1893 | return (unative_t) address; |
1894 | else |
1894 | else |
1895 | return (unative_t) -1; |
1895 | return (unative_t) -1; |
1896 | } |
1896 | } |
1897 | 1897 | ||
1898 | /** Wrapper for as_area_resize(). */ |
1898 | /** Wrapper for as_area_resize(). */ |
1899 | unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags) |
1899 | unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags) |
1900 | { |
1900 | { |
1901 | return (unative_t) as_area_resize(AS, address, size, 0); |
1901 | return (unative_t) as_area_resize(AS, address, size, 0); |
1902 | } |
1902 | } |
1903 | 1903 | ||
1904 | /** Wrapper for as_area_change_flags(). */ |
1904 | /** Wrapper for as_area_change_flags(). */ |
1905 | unative_t sys_as_area_change_flags(uintptr_t address, int flags) |
1905 | unative_t sys_as_area_change_flags(uintptr_t address, int flags) |
1906 | { |
1906 | { |
1907 | return (unative_t) as_area_change_flags(AS, flags, address); |
1907 | return (unative_t) as_area_change_flags(AS, flags, address); |
1908 | } |
1908 | } |
1909 | 1909 | ||
1910 | /** Wrapper for as_area_destroy(). */ |
1910 | /** Wrapper for as_area_destroy(). */ |
1911 | unative_t sys_as_area_destroy(uintptr_t address) |
1911 | unative_t sys_as_area_destroy(uintptr_t address) |
1912 | { |
1912 | { |
1913 | return (unative_t) as_area_destroy(AS, address); |
1913 | return (unative_t) as_area_destroy(AS, address); |
1914 | } |
1914 | } |
1915 | 1915 | ||
1916 | /** Print out information about address space. |
1916 | /** Print out information about address space. |
1917 | * |
1917 | * |
1918 | * @param as Address space. |
1918 | * @param as Address space. |
1919 | */ |
1919 | */ |
1920 | void as_print(as_t *as) |
1920 | void as_print(as_t *as) |
1921 | { |
1921 | { |
1922 | ipl_t ipl; |
1922 | ipl_t ipl; |
1923 | 1923 | ||
1924 | ipl = interrupts_disable(); |
1924 | ipl = interrupts_disable(); |
1925 | mutex_lock(&as->lock); |
1925 | mutex_lock(&as->lock); |
1926 | 1926 | ||
1927 | /* print out info about address space areas */ |
1927 | /* print out info about address space areas */ |
1928 | link_t *cur; |
1928 | link_t *cur; |
1929 | for (cur = as->as_area_btree.leaf_head.next; |
1929 | for (cur = as->as_area_btree.leaf_head.next; |
1930 | cur != &as->as_area_btree.leaf_head; cur = cur->next) { |
1930 | cur != &as->as_area_btree.leaf_head; cur = cur->next) { |
1931 | btree_node_t *node; |
1931 | btree_node_t *node; |
1932 | 1932 | ||
1933 | node = list_get_instance(cur, btree_node_t, leaf_link); |
1933 | node = list_get_instance(cur, btree_node_t, leaf_link); |
1934 | 1934 | ||
1935 | unsigned int i; |
1935 | unsigned int i; |
1936 | for (i = 0; i < node->keys; i++) { |
1936 | for (i = 0; i < node->keys; i++) { |
1937 | as_area_t *area = node->value[i]; |
1937 | as_area_t *area = node->value[i]; |
1938 | 1938 | ||
1939 | mutex_lock(&area->lock); |
1939 | mutex_lock(&area->lock); |
1940 | printf("as_area: %p, base=%p, pages=%" PRIc |
1940 | printf("as_area: %p, base=%p, pages=%" PRIc |
1941 | " (%p - %p)\n", area, area->base, area->pages, |
1941 | " (%p - %p)\n", area, area->base, area->pages, |
1942 | area->base, area->base + FRAMES2SIZE(area->pages)); |
1942 | area->base, area->base + FRAMES2SIZE(area->pages)); |
1943 | mutex_unlock(&area->lock); |
1943 | mutex_unlock(&area->lock); |
1944 | } |
1944 | } |
1945 | } |
1945 | } |
1946 | 1946 | ||
1947 | mutex_unlock(&as->lock); |
1947 | mutex_unlock(&as->lock); |
1948 | interrupts_restore(ipl); |
1948 | interrupts_restore(ipl); |
1949 | } |
1949 | } |
1950 | 1950 | ||
1951 | /** @} |
1951 | /** @} |
1952 | */ |
1952 | */ |
1953 | 1953 |