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1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: nsload - namespace loading/expanding/contracting procedures | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
8 | * Copyright (C) 2000 - 2005, R. Byron Moore | |
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 | ||
44 | ||
45 | #include <acpi/acpi.h> | |
46 | #include <acpi/acnamesp.h> | |
47 | #include <acpi/acdispat.h> | |
48 | ||
49 | ||
50 | #define _COMPONENT ACPI_NAMESPACE | |
51 | ACPI_MODULE_NAME ("nsload") | |
52 | ||
53 | ||
54 | #ifndef ACPI_NO_METHOD_EXECUTION | |
55 | ||
56 | /******************************************************************************* | |
57 | * | |
58 | * FUNCTION: acpi_ns_load_table | |
59 | * | |
60 | * PARAMETERS: table_desc - Descriptor for table to be loaded | |
61 | * Node - Owning NS node | |
62 | * | |
63 | * RETURN: Status | |
64 | * | |
65 | * DESCRIPTION: Load one ACPI table into the namespace | |
66 | * | |
67 | ******************************************************************************/ | |
68 | ||
69 | acpi_status | |
70 | acpi_ns_load_table ( | |
71 | struct acpi_table_desc *table_desc, | |
72 | struct acpi_namespace_node *node) | |
73 | { | |
74 | acpi_status status; | |
75 | ||
76 | ||
77 | ACPI_FUNCTION_TRACE ("ns_load_table"); | |
78 | ||
79 | ||
80 | /* Check if table contains valid AML (must be DSDT, PSDT, SSDT, etc.) */ | |
81 | ||
82 | if (!(acpi_gbl_table_data[table_desc->type].flags & ACPI_TABLE_EXECUTABLE)) { | |
83 | /* Just ignore this table */ | |
84 | ||
85 | return_ACPI_STATUS (AE_OK); | |
86 | } | |
87 | ||
88 | /* Check validity of the AML start and length */ | |
89 | ||
90 | if (!table_desc->aml_start) { | |
91 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null AML pointer\n")); | |
92 | return_ACPI_STATUS (AE_BAD_PARAMETER); | |
93 | } | |
94 | ||
95 | ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "AML block at %p\n", | |
96 | table_desc->aml_start)); | |
97 | ||
98 | /* Ignore table if there is no AML contained within */ | |
99 | ||
100 | if (!table_desc->aml_length) { | |
101 | ACPI_REPORT_WARNING (("Zero-length AML block in table [%4.4s]\n", | |
102 | table_desc->pointer->signature)); | |
103 | return_ACPI_STATUS (AE_OK); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Parse the table and load the namespace with all named | |
108 | * objects found within. Control methods are NOT parsed | |
109 | * at this time. In fact, the control methods cannot be | |
110 | * parsed until the entire namespace is loaded, because | |
111 | * if a control method makes a forward reference (call) | |
112 | * to another control method, we can't continue parsing | |
113 | * because we don't know how many arguments to parse next! | |
114 | */ | |
115 | ACPI_DEBUG_PRINT ((ACPI_DB_INFO, | |
116 | "**** Loading table into namespace ****\n")); | |
117 | ||
118 | status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); | |
119 | if (ACPI_FAILURE (status)) { | |
120 | return_ACPI_STATUS (status); | |
121 | } | |
122 | ||
123 | status = acpi_ns_parse_table (table_desc, node->child); | |
124 | (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); | |
125 | ||
126 | if (ACPI_FAILURE (status)) { | |
127 | return_ACPI_STATUS (status); | |
128 | } | |
129 | ||
130 | /* | |
131 | * Now we can parse the control methods. We always parse | |
132 | * them here for a sanity check, and if configured for | |
133 | * just-in-time parsing, we delete the control method | |
134 | * parse trees. | |
135 | */ | |
136 | ACPI_DEBUG_PRINT ((ACPI_DB_INFO, | |
137 | "**** Begin Table Method Parsing and Object Initialization ****\n")); | |
138 | ||
139 | status = acpi_ds_initialize_objects (table_desc, node); | |
140 | ||
141 | ACPI_DEBUG_PRINT ((ACPI_DB_INFO, | |
142 | "**** Completed Table Method Parsing and Object Initialization ****\n")); | |
143 | ||
144 | return_ACPI_STATUS (status); | |
145 | } | |
146 | ||
147 | ||
148 | /******************************************************************************* | |
149 | * | |
150 | * FUNCTION: acpi_ns_load_table_by_type | |
151 | * | |
152 | * PARAMETERS: table_type - Id of the table type to load | |
153 | * | |
154 | * RETURN: Status | |
155 | * | |
156 | * DESCRIPTION: Load an ACPI table or tables into the namespace. All tables | |
157 | * of the given type are loaded. The mechanism allows this | |
158 | * routine to be called repeatedly. | |
159 | * | |
160 | ******************************************************************************/ | |
161 | ||
162 | acpi_status | |
163 | acpi_ns_load_table_by_type ( | |
164 | acpi_table_type table_type) | |
165 | { | |
166 | u32 i; | |
167 | acpi_status status; | |
168 | struct acpi_table_desc *table_desc; | |
169 | ||
170 | ||
171 | ACPI_FUNCTION_TRACE ("ns_load_table_by_type"); | |
172 | ||
173 | ||
174 | status = acpi_ut_acquire_mutex (ACPI_MTX_TABLES); | |
175 | if (ACPI_FAILURE (status)) { | |
176 | return_ACPI_STATUS (status); | |
177 | } | |
178 | ||
179 | /* | |
180 | * Table types supported are: | |
181 | * DSDT (one), SSDT/PSDT (multiple) | |
182 | */ | |
183 | switch (table_type) { | |
184 | case ACPI_TABLE_DSDT: | |
185 | ||
186 | ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Loading DSDT\n")); | |
187 | ||
188 | table_desc = acpi_gbl_table_lists[ACPI_TABLE_DSDT].next; | |
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 | ||
198 | status = acpi_ns_load_table (table_desc, acpi_gbl_root_node); | |
199 | if (ACPI_SUCCESS (status)) { | |
200 | table_desc->loaded_into_namespace = TRUE; | |
201 | } | |
202 | break; | |
203 | ||
204 | ||
205 | case ACPI_TABLE_SSDT: | |
206 | ||
207 | ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Loading %d SSDTs\n", | |
208 | acpi_gbl_table_lists[ACPI_TABLE_SSDT].count)); | |
209 | ||
210 | /* | |
211 | * Traverse list of SSDT tables | |
212 | */ | |
213 | table_desc = acpi_gbl_table_lists[ACPI_TABLE_SSDT].next; | |
214 | for (i = 0; i < acpi_gbl_table_lists[ACPI_TABLE_SSDT].count; i++) { | |
215 | /* | |
216 | * Only attempt to load table if it is not | |
217 | * already loaded! | |
218 | */ | |
219 | if (!table_desc->loaded_into_namespace) { | |
220 | status = acpi_ns_load_table (table_desc, acpi_gbl_root_node); | |
221 | if (ACPI_FAILURE (status)) { | |
222 | break; | |
223 | } | |
224 | ||
225 | table_desc->loaded_into_namespace = TRUE; | |
226 | } | |
227 | ||
228 | table_desc = table_desc->next; | |
229 | } | |
230 | break; | |
231 | ||
232 | ||
233 | case ACPI_TABLE_PSDT: | |
234 | ||
235 | ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Loading %d PSDTs\n", | |
236 | acpi_gbl_table_lists[ACPI_TABLE_PSDT].count)); | |
237 | ||
238 | /* | |
239 | * Traverse list of PSDT tables | |
240 | */ | |
241 | table_desc = acpi_gbl_table_lists[ACPI_TABLE_PSDT].next; | |
242 | ||
243 | for (i = 0; i < acpi_gbl_table_lists[ACPI_TABLE_PSDT].count; i++) { | |
244 | /* Only attempt to load table if it is not already loaded! */ | |
245 | ||
246 | if (!table_desc->loaded_into_namespace) { | |
247 | status = acpi_ns_load_table (table_desc, acpi_gbl_root_node); | |
248 | if (ACPI_FAILURE (status)) { | |
249 | break; | |
250 | } | |
251 | ||
252 | table_desc->loaded_into_namespace = TRUE; | |
253 | } | |
254 | ||
255 | table_desc = table_desc->next; | |
256 | } | |
257 | break; | |
258 | ||
259 | ||
260 | default: | |
261 | status = AE_SUPPORT; | |
262 | break; | |
263 | } | |
264 | ||
265 | ||
266 | unlock_and_exit: | |
267 | (void) acpi_ut_release_mutex (ACPI_MTX_TABLES); | |
268 | return_ACPI_STATUS (status); | |
269 | } | |
270 | ||
271 | ||
272 | /******************************************************************************* | |
273 | * | |
274 | * FUNCTION: acpi_load_namespace | |
275 | * | |
276 | * PARAMETERS: None | |
277 | * | |
278 | * RETURN: Status | |
279 | * | |
280 | * DESCRIPTION: Load the name space from what ever is pointed to by DSDT. | |
281 | * (DSDT points to either the BIOS or a buffer.) | |
282 | * | |
283 | ******************************************************************************/ | |
284 | ||
285 | acpi_status | |
286 | acpi_ns_load_namespace ( | |
287 | void) | |
288 | { | |
289 | acpi_status status; | |
290 | ||
291 | ||
292 | ACPI_FUNCTION_TRACE ("acpi_load_name_space"); | |
293 | ||
294 | ||
295 | /* There must be at least a DSDT installed */ | |
296 | ||
297 | if (acpi_gbl_DSDT == NULL) { | |
298 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "DSDT is not in memory\n")); | |
299 | return_ACPI_STATUS (AE_NO_ACPI_TABLES); | |
300 | } | |
301 | ||
302 | /* | |
303 | * Load the namespace. The DSDT is required, | |
304 | * but the SSDT and PSDT tables are optional. | |
305 | */ | |
306 | status = acpi_ns_load_table_by_type (ACPI_TABLE_DSDT); | |
307 | if (ACPI_FAILURE (status)) { | |
308 | return_ACPI_STATUS (status); | |
309 | } | |
310 | ||
311 | /* Ignore exceptions from these */ | |
312 | ||
313 | (void) acpi_ns_load_table_by_type (ACPI_TABLE_SSDT); | |
314 | (void) acpi_ns_load_table_by_type (ACPI_TABLE_PSDT); | |
315 | ||
316 | ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT, | |
317 | "ACPI Namespace successfully loaded at root %p\n", | |
318 | acpi_gbl_root_node)); | |
319 | ||
320 | return_ACPI_STATUS (status); | |
321 | } | |
322 | ||
323 | ||
324 | #ifdef ACPI_FUTURE_USAGE | |
325 | ||
326 | /******************************************************************************* | |
327 | * | |
328 | * FUNCTION: acpi_ns_delete_subtree | |
329 | * | |
330 | * PARAMETERS: start_handle - Handle in namespace where search begins | |
331 | * | |
332 | * RETURNS Status | |
333 | * | |
334 | * DESCRIPTION: Walks the namespace starting at the given handle and deletes | |
335 | * all objects, entries, and scopes in the entire subtree. | |
336 | * | |
337 | * Namespace/Interpreter should be locked or the subsystem should | |
338 | * be in shutdown before this routine is called. | |
339 | * | |
340 | ******************************************************************************/ | |
341 | ||
342 | acpi_status | |
343 | acpi_ns_delete_subtree ( | |
344 | acpi_handle start_handle) | |
345 | { | |
346 | acpi_status status; | |
347 | acpi_handle child_handle; | |
348 | acpi_handle parent_handle; | |
349 | acpi_handle next_child_handle; | |
350 | acpi_handle dummy; | |
351 | u32 level; | |
352 | ||
353 | ||
354 | ACPI_FUNCTION_TRACE ("ns_delete_subtree"); | |
355 | ||
356 | ||
357 | parent_handle = start_handle; | |
358 | child_handle = NULL; | |
359 | level = 1; | |
360 | ||
361 | /* | |
362 | * Traverse the tree of objects until we bubble back up | |
363 | * to where we started. | |
364 | */ | |
365 | while (level > 0) { | |
366 | /* Attempt to get the next object in this scope */ | |
367 | ||
368 | status = acpi_get_next_object (ACPI_TYPE_ANY, parent_handle, | |
369 | child_handle, &next_child_handle); | |
370 | ||
371 | child_handle = next_child_handle; | |
372 | ||
373 | /* Did we get a new object? */ | |
374 | ||
375 | if (ACPI_SUCCESS (status)) { | |
376 | /* Check if this object has any children */ | |
377 | ||
378 | if (ACPI_SUCCESS (acpi_get_next_object (ACPI_TYPE_ANY, child_handle, | |
379 | NULL, &dummy))) { | |
380 | /* | |
381 | * There is at least one child of this object, | |
382 | * visit the object | |
383 | */ | |
384 | level++; | |
385 | parent_handle = child_handle; | |
386 | child_handle = NULL; | |
387 | } | |
388 | } | |
389 | else { | |
390 | /* | |
391 | * No more children in this object, go back up to | |
392 | * the object's parent | |
393 | */ | |
394 | level--; | |
395 | ||
396 | /* Delete all children now */ | |
397 | ||
398 | acpi_ns_delete_children (child_handle); | |
399 | ||
400 | child_handle = parent_handle; | |
401 | status = acpi_get_parent (parent_handle, &parent_handle); | |
402 | if (ACPI_FAILURE (status)) { | |
403 | return_ACPI_STATUS (status); | |
404 | } | |
405 | } | |
406 | } | |
407 | ||
408 | /* Now delete the starting object, and we are done */ | |
409 | ||
410 | acpi_ns_delete_node (child_handle); | |
411 | ||
412 | return_ACPI_STATUS (AE_OK); | |
413 | } | |
414 | ||
415 | ||
416 | /******************************************************************************* | |
417 | * | |
418 | * FUNCTION: acpi_ns_unload_name_space | |
419 | * | |
420 | * PARAMETERS: Handle - Root of namespace subtree to be deleted | |
421 | * | |
422 | * RETURN: Status | |
423 | * | |
424 | * DESCRIPTION: Shrinks the namespace, typically in response to an undocking | |
425 | * event. Deletes an entire subtree starting from (and | |
426 | * including) the given handle. | |
427 | * | |
428 | ******************************************************************************/ | |
429 | ||
430 | acpi_status | |
431 | acpi_ns_unload_namespace ( | |
432 | acpi_handle handle) | |
433 | { | |
434 | acpi_status status; | |
435 | ||
436 | ||
437 | ACPI_FUNCTION_TRACE ("ns_unload_name_space"); | |
438 | ||
439 | ||
440 | /* Parameter validation */ | |
441 | ||
442 | if (!acpi_gbl_root_node) { | |
443 | return_ACPI_STATUS (AE_NO_NAMESPACE); | |
444 | } | |
445 | ||
446 | if (!handle) { | |
447 | return_ACPI_STATUS (AE_BAD_PARAMETER); | |
448 | } | |
449 | ||
450 | /* This function does the real work */ | |
451 | ||
452 | status = acpi_ns_delete_subtree (handle); | |
453 | ||
454 | return_ACPI_STATUS (status); | |
455 | } | |
456 | ||
457 | #endif /* ACPI_FUTURE_USAGE */ | |
458 | ||
459 | #endif | |
460 |