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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: nsload - namespace loading/expanding/contracting procedures | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
4a90c7e8 | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
1da177e4 LT |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
1da177e4 LT |
44 | #include <acpi/acpi.h> |
45 | #include <acpi/acnamesp.h> | |
46 | #include <acpi/acdispat.h> | |
47 | ||
1da177e4 | 48 | #define _COMPONENT ACPI_NAMESPACE |
4be44fcd | 49 | ACPI_MODULE_NAME("nsload") |
1da177e4 | 50 | |
44f6c012 | 51 | /* Local prototypes */ |
4be44fcd | 52 | static acpi_status acpi_ns_load_table_by_type(acpi_table_type table_type); |
44f6c012 RM |
53 | |
54 | #ifdef ACPI_FUTURE_IMPLEMENTATION | |
4be44fcd | 55 | acpi_status acpi_ns_unload_namespace(acpi_handle handle); |
44f6c012 | 56 | |
4be44fcd | 57 | static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle); |
44f6c012 | 58 | #endif |
1da177e4 | 59 | |
44f6c012 | 60 | #ifndef ACPI_NO_METHOD_EXECUTION |
1da177e4 LT |
61 | /******************************************************************************* |
62 | * | |
63 | * FUNCTION: acpi_ns_load_table | |
64 | * | |
65 | * PARAMETERS: table_desc - Descriptor for table to be loaded | |
66 | * Node - Owning NS node | |
67 | * | |
68 | * RETURN: Status | |
69 | * | |
70 | * DESCRIPTION: Load one ACPI table into the namespace | |
71 | * | |
72 | ******************************************************************************/ | |
73 | ||
74 | acpi_status | |
4be44fcd LB |
75 | acpi_ns_load_table(struct acpi_table_desc *table_desc, |
76 | struct acpi_namespace_node *node) | |
1da177e4 | 77 | { |
4be44fcd | 78 | acpi_status status; |
1da177e4 | 79 | |
b229cf92 | 80 | ACPI_FUNCTION_TRACE(ns_load_table); |
1da177e4 LT |
81 | |
82 | /* Check if table contains valid AML (must be DSDT, PSDT, SSDT, etc.) */ | |
83 | ||
4be44fcd LB |
84 | if (! |
85 | (acpi_gbl_table_data[table_desc->type]. | |
86 | flags & ACPI_TABLE_EXECUTABLE)) { | |
52fc0b02 | 87 | |
1da177e4 LT |
88 | /* Just ignore this table */ |
89 | ||
4be44fcd | 90 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
91 | } |
92 | ||
93 | /* Check validity of the AML start and length */ | |
94 | ||
95 | if (!table_desc->aml_start) { | |
b8e4d893 | 96 | ACPI_ERROR((AE_INFO, "Null AML pointer")); |
4be44fcd | 97 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
98 | } |
99 | ||
4be44fcd LB |
100 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AML block at %p\n", |
101 | table_desc->aml_start)); | |
1da177e4 LT |
102 | |
103 | /* Ignore table if there is no AML contained within */ | |
104 | ||
105 | if (!table_desc->aml_length) { | |
b8e4d893 BM |
106 | ACPI_WARNING((AE_INFO, "Zero-length AML block in table [%4.4s]", |
107 | table_desc->pointer->signature)); | |
4be44fcd | 108 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
109 | } |
110 | ||
111 | /* | |
112 | * Parse the table and load the namespace with all named | |
113 | * objects found within. Control methods are NOT parsed | |
114 | * at this time. In fact, the control methods cannot be | |
115 | * parsed until the entire namespace is loaded, because | |
116 | * if a control method makes a forward reference (call) | |
117 | * to another control method, we can't continue parsing | |
118 | * because we don't know how many arguments to parse next! | |
119 | */ | |
4be44fcd LB |
120 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
121 | "**** Loading table into namespace ****\n")); | |
1da177e4 | 122 | |
4be44fcd LB |
123 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
124 | if (ACPI_FAILURE(status)) { | |
125 | return_ACPI_STATUS(status); | |
1da177e4 LT |
126 | } |
127 | ||
4be44fcd LB |
128 | status = acpi_ns_parse_table(table_desc, node->child); |
129 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 | 130 | |
4be44fcd LB |
131 | if (ACPI_FAILURE(status)) { |
132 | return_ACPI_STATUS(status); | |
1da177e4 LT |
133 | } |
134 | ||
135 | /* | |
136 | * Now we can parse the control methods. We always parse | |
137 | * them here for a sanity check, and if configured for | |
138 | * just-in-time parsing, we delete the control method | |
139 | * parse trees. | |
140 | */ | |
4be44fcd LB |
141 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
142 | "**** Begin Table Method Parsing and Object Initialization ****\n")); | |
1da177e4 | 143 | |
4be44fcd | 144 | status = acpi_ds_initialize_objects(table_desc, node); |
1da177e4 | 145 | |
4be44fcd LB |
146 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
147 | "**** Completed Table Method Parsing and Object Initialization ****\n")); | |
1da177e4 | 148 | |
4be44fcd | 149 | return_ACPI_STATUS(status); |
1da177e4 LT |
150 | } |
151 | ||
1da177e4 LT |
152 | /******************************************************************************* |
153 | * | |
154 | * FUNCTION: acpi_ns_load_table_by_type | |
155 | * | |
156 | * PARAMETERS: table_type - Id of the table type to load | |
157 | * | |
158 | * RETURN: Status | |
159 | * | |
160 | * DESCRIPTION: Load an ACPI table or tables into the namespace. All tables | |
161 | * of the given type are loaded. The mechanism allows this | |
162 | * routine to be called repeatedly. | |
163 | * | |
164 | ******************************************************************************/ | |
165 | ||
4be44fcd | 166 | static acpi_status acpi_ns_load_table_by_type(acpi_table_type table_type) |
1da177e4 | 167 | { |
4be44fcd LB |
168 | u32 i; |
169 | acpi_status status; | |
170 | struct acpi_table_desc *table_desc; | |
1da177e4 | 171 | |
b229cf92 | 172 | ACPI_FUNCTION_TRACE(ns_load_table_by_type); |
1da177e4 | 173 | |
4be44fcd LB |
174 | status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES); |
175 | if (ACPI_FAILURE(status)) { | |
176 | return_ACPI_STATUS(status); | |
1da177e4 LT |
177 | } |
178 | ||
179 | /* | |
180 | * Table types supported are: | |
181 | * DSDT (one), SSDT/PSDT (multiple) | |
182 | */ | |
183 | switch (table_type) { | |
b229cf92 | 184 | case ACPI_TABLE_ID_DSDT: |
1da177e4 | 185 | |
4be44fcd | 186 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace load: DSDT\n")); |
1da177e4 | 187 | |
b229cf92 | 188 | table_desc = acpi_gbl_table_lists[ACPI_TABLE_ID_DSDT].next; |
1da177e4 LT |
189 | |
190 | /* If table already loaded into namespace, just return */ | |
191 | ||
192 | if (table_desc->loaded_into_namespace) { | |
193 | goto unlock_and_exit; | |
194 | } | |
195 | ||
196 | /* Now load the single DSDT */ | |
197 | ||
4be44fcd LB |
198 | status = acpi_ns_load_table(table_desc, acpi_gbl_root_node); |
199 | if (ACPI_SUCCESS(status)) { | |
1da177e4 LT |
200 | table_desc->loaded_into_namespace = TRUE; |
201 | } | |
202 | break; | |
203 | ||
b229cf92 BM |
204 | case ACPI_TABLE_ID_SSDT: |
205 | case ACPI_TABLE_ID_PSDT: | |
1da177e4 | 206 | |
4be44fcd LB |
207 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
208 | "Namespace load: %d SSDT or PSDTs\n", | |
209 | acpi_gbl_table_lists[table_type].count)); | |
1da177e4 LT |
210 | |
211 | /* | |
0c9938cc | 212 | * Traverse list of SSDT or PSDT tables |
1da177e4 | 213 | */ |
0c9938cc RM |
214 | table_desc = acpi_gbl_table_lists[table_type].next; |
215 | for (i = 0; i < acpi_gbl_table_lists[table_type].count; i++) { | |
1da177e4 | 216 | /* |
0c9938cc | 217 | * Only attempt to load table into namespace if it is not |
1da177e4 LT |
218 | * already loaded! |
219 | */ | |
220 | if (!table_desc->loaded_into_namespace) { | |
4be44fcd LB |
221 | status = |
222 | acpi_ns_load_table(table_desc, | |
223 | acpi_gbl_root_node); | |
224 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
225 | break; |
226 | } | |
227 | ||
228 | table_desc->loaded_into_namespace = TRUE; | |
229 | } | |
230 | ||
231 | table_desc = table_desc->next; | |
232 | } | |
233 | break; | |
234 | ||
1da177e4 LT |
235 | default: |
236 | status = AE_SUPPORT; | |
237 | break; | |
238 | } | |
239 | ||
4be44fcd LB |
240 | unlock_and_exit: |
241 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); | |
242 | return_ACPI_STATUS(status); | |
1da177e4 LT |
243 | } |
244 | ||
1da177e4 LT |
245 | /******************************************************************************* |
246 | * | |
247 | * FUNCTION: acpi_load_namespace | |
248 | * | |
249 | * PARAMETERS: None | |
250 | * | |
251 | * RETURN: Status | |
252 | * | |
253 | * DESCRIPTION: Load the name space from what ever is pointed to by DSDT. | |
254 | * (DSDT points to either the BIOS or a buffer.) | |
255 | * | |
256 | ******************************************************************************/ | |
257 | ||
4be44fcd | 258 | acpi_status acpi_ns_load_namespace(void) |
1da177e4 | 259 | { |
4be44fcd | 260 | acpi_status status; |
1da177e4 | 261 | |
b229cf92 | 262 | ACPI_FUNCTION_TRACE(acpi_load_name_space); |
1da177e4 LT |
263 | |
264 | /* There must be at least a DSDT installed */ | |
265 | ||
266 | if (acpi_gbl_DSDT == NULL) { | |
b8e4d893 | 267 | ACPI_ERROR((AE_INFO, "DSDT is not in memory")); |
4be44fcd | 268 | return_ACPI_STATUS(AE_NO_ACPI_TABLES); |
1da177e4 LT |
269 | } |
270 | ||
271 | /* | |
272 | * Load the namespace. The DSDT is required, | |
273 | * but the SSDT and PSDT tables are optional. | |
274 | */ | |
b229cf92 | 275 | status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT); |
4be44fcd LB |
276 | if (ACPI_FAILURE(status)) { |
277 | return_ACPI_STATUS(status); | |
1da177e4 LT |
278 | } |
279 | ||
280 | /* Ignore exceptions from these */ | |
281 | ||
b229cf92 BM |
282 | (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT); |
283 | (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT); | |
1da177e4 | 284 | |
4be44fcd LB |
285 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, |
286 | "ACPI Namespace successfully loaded at root %p\n", | |
287 | acpi_gbl_root_node)); | |
1da177e4 | 288 | |
4be44fcd | 289 | return_ACPI_STATUS(status); |
1da177e4 LT |
290 | } |
291 | ||
44f6c012 | 292 | #ifdef ACPI_FUTURE_IMPLEMENTATION |
1da177e4 LT |
293 | /******************************************************************************* |
294 | * | |
295 | * FUNCTION: acpi_ns_delete_subtree | |
296 | * | |
297 | * PARAMETERS: start_handle - Handle in namespace where search begins | |
298 | * | |
299 | * RETURNS Status | |
300 | * | |
301 | * DESCRIPTION: Walks the namespace starting at the given handle and deletes | |
302 | * all objects, entries, and scopes in the entire subtree. | |
303 | * | |
304 | * Namespace/Interpreter should be locked or the subsystem should | |
305 | * be in shutdown before this routine is called. | |
306 | * | |
307 | ******************************************************************************/ | |
308 | ||
4be44fcd | 309 | static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle) |
1da177e4 | 310 | { |
4be44fcd LB |
311 | acpi_status status; |
312 | acpi_handle child_handle; | |
313 | acpi_handle parent_handle; | |
314 | acpi_handle next_child_handle; | |
315 | acpi_handle dummy; | |
316 | u32 level; | |
1da177e4 | 317 | |
b229cf92 | 318 | ACPI_FUNCTION_TRACE(ns_delete_subtree); |
1da177e4 LT |
319 | |
320 | parent_handle = start_handle; | |
321 | child_handle = NULL; | |
4be44fcd | 322 | level = 1; |
1da177e4 LT |
323 | |
324 | /* | |
325 | * Traverse the tree of objects until we bubble back up | |
326 | * to where we started. | |
327 | */ | |
328 | while (level > 0) { | |
52fc0b02 | 329 | |
1da177e4 LT |
330 | /* Attempt to get the next object in this scope */ |
331 | ||
4be44fcd LB |
332 | status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle, |
333 | child_handle, &next_child_handle); | |
1da177e4 LT |
334 | |
335 | child_handle = next_child_handle; | |
336 | ||
337 | /* Did we get a new object? */ | |
338 | ||
4be44fcd | 339 | if (ACPI_SUCCESS(status)) { |
52fc0b02 | 340 | |
1da177e4 LT |
341 | /* Check if this object has any children */ |
342 | ||
4be44fcd LB |
343 | if (ACPI_SUCCESS |
344 | (acpi_get_next_object | |
345 | (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) { | |
1da177e4 LT |
346 | /* |
347 | * There is at least one child of this object, | |
348 | * visit the object | |
349 | */ | |
350 | level++; | |
351 | parent_handle = child_handle; | |
352 | child_handle = NULL; | |
353 | } | |
4be44fcd | 354 | } else { |
1da177e4 LT |
355 | /* |
356 | * No more children in this object, go back up to | |
357 | * the object's parent | |
358 | */ | |
359 | level--; | |
360 | ||
361 | /* Delete all children now */ | |
362 | ||
4be44fcd | 363 | acpi_ns_delete_children(child_handle); |
1da177e4 LT |
364 | |
365 | child_handle = parent_handle; | |
4be44fcd LB |
366 | status = acpi_get_parent(parent_handle, &parent_handle); |
367 | if (ACPI_FAILURE(status)) { | |
368 | return_ACPI_STATUS(status); | |
1da177e4 LT |
369 | } |
370 | } | |
371 | } | |
372 | ||
373 | /* Now delete the starting object, and we are done */ | |
374 | ||
4be44fcd | 375 | acpi_ns_delete_node(child_handle); |
1da177e4 | 376 | |
4be44fcd | 377 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
378 | } |
379 | ||
1da177e4 LT |
380 | /******************************************************************************* |
381 | * | |
382 | * FUNCTION: acpi_ns_unload_name_space | |
383 | * | |
384 | * PARAMETERS: Handle - Root of namespace subtree to be deleted | |
385 | * | |
386 | * RETURN: Status | |
387 | * | |
388 | * DESCRIPTION: Shrinks the namespace, typically in response to an undocking | |
389 | * event. Deletes an entire subtree starting from (and | |
390 | * including) the given handle. | |
391 | * | |
392 | ******************************************************************************/ | |
393 | ||
4be44fcd | 394 | acpi_status acpi_ns_unload_namespace(acpi_handle handle) |
1da177e4 | 395 | { |
4be44fcd | 396 | acpi_status status; |
1da177e4 | 397 | |
b229cf92 | 398 | ACPI_FUNCTION_TRACE(ns_unload_name_space); |
1da177e4 LT |
399 | |
400 | /* Parameter validation */ | |
401 | ||
402 | if (!acpi_gbl_root_node) { | |
4be44fcd | 403 | return_ACPI_STATUS(AE_NO_NAMESPACE); |
1da177e4 LT |
404 | } |
405 | ||
406 | if (!handle) { | |
4be44fcd | 407 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
408 | } |
409 | ||
410 | /* This function does the real work */ | |
411 | ||
4be44fcd | 412 | status = acpi_ns_delete_subtree(handle); |
1da177e4 | 413 | |
4be44fcd | 414 | return_ACPI_STATUS(status); |
1da177e4 | 415 | } |
44f6c012 | 416 | #endif |
1da177e4 | 417 | #endif |