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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 | |
4be44fcd | 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)) { | |
1da177e4 LT |
87 | /* Just ignore this table */ |
88 | ||
4be44fcd | 89 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
90 | } |
91 | ||
92 | /* Check validity of the AML start and length */ | |
93 | ||
94 | if (!table_desc->aml_start) { | |
4a90c7e8 | 95 | ACPI_REPORT_ERROR(("Null AML pointer\n")); |
4be44fcd | 96 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
97 | } |
98 | ||
4be44fcd LB |
99 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AML block at %p\n", |
100 | table_desc->aml_start)); | |
1da177e4 LT |
101 | |
102 | /* Ignore table if there is no AML contained within */ | |
103 | ||
104 | if (!table_desc->aml_length) { | |
4be44fcd LB |
105 | ACPI_REPORT_WARNING(("Zero-length AML block in table [%4.4s]\n", |
106 | table_desc->pointer->signature)); | |
107 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
108 | } |
109 | ||
110 | /* | |
111 | * Parse the table and load the namespace with all named | |
112 | * objects found within. Control methods are NOT parsed | |
113 | * at this time. In fact, the control methods cannot be | |
114 | * parsed until the entire namespace is loaded, because | |
115 | * if a control method makes a forward reference (call) | |
116 | * to another control method, we can't continue parsing | |
117 | * because we don't know how many arguments to parse next! | |
118 | */ | |
4be44fcd LB |
119 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
120 | "**** Loading table into namespace ****\n")); | |
1da177e4 | 121 | |
4be44fcd LB |
122 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
123 | if (ACPI_FAILURE(status)) { | |
124 | return_ACPI_STATUS(status); | |
1da177e4 LT |
125 | } |
126 | ||
4be44fcd LB |
127 | status = acpi_ns_parse_table(table_desc, node->child); |
128 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
1da177e4 | 129 | |
4be44fcd LB |
130 | if (ACPI_FAILURE(status)) { |
131 | return_ACPI_STATUS(status); | |
1da177e4 LT |
132 | } |
133 | ||
134 | /* | |
135 | * Now we can parse the control methods. We always parse | |
136 | * them here for a sanity check, and if configured for | |
137 | * just-in-time parsing, we delete the control method | |
138 | * parse trees. | |
139 | */ | |
4be44fcd LB |
140 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
141 | "**** Begin Table Method Parsing and Object Initialization ****\n")); | |
1da177e4 | 142 | |
4be44fcd | 143 | status = acpi_ds_initialize_objects(table_desc, node); |
1da177e4 | 144 | |
4be44fcd LB |
145 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
146 | "**** Completed Table Method Parsing and Object Initialization ****\n")); | |
1da177e4 | 147 | |
4be44fcd | 148 | return_ACPI_STATUS(status); |
1da177e4 LT |
149 | } |
150 | ||
1da177e4 LT |
151 | /******************************************************************************* |
152 | * | |
153 | * FUNCTION: acpi_ns_load_table_by_type | |
154 | * | |
155 | * PARAMETERS: table_type - Id of the table type to load | |
156 | * | |
157 | * RETURN: Status | |
158 | * | |
159 | * DESCRIPTION: Load an ACPI table or tables into the namespace. All tables | |
160 | * of the given type are loaded. The mechanism allows this | |
161 | * routine to be called repeatedly. | |
162 | * | |
163 | ******************************************************************************/ | |
164 | ||
4be44fcd | 165 | static acpi_status acpi_ns_load_table_by_type(acpi_table_type table_type) |
1da177e4 | 166 | { |
4be44fcd LB |
167 | u32 i; |
168 | acpi_status status; | |
169 | struct acpi_table_desc *table_desc; | |
1da177e4 | 170 | |
4be44fcd | 171 | ACPI_FUNCTION_TRACE("ns_load_table_by_type"); |
1da177e4 | 172 | |
4be44fcd LB |
173 | status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES); |
174 | if (ACPI_FAILURE(status)) { | |
175 | return_ACPI_STATUS(status); | |
1da177e4 LT |
176 | } |
177 | ||
178 | /* | |
179 | * Table types supported are: | |
180 | * DSDT (one), SSDT/PSDT (multiple) | |
181 | */ | |
182 | switch (table_type) { | |
183 | case ACPI_TABLE_DSDT: | |
184 | ||
4be44fcd | 185 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace load: DSDT\n")); |
1da177e4 LT |
186 | |
187 | table_desc = acpi_gbl_table_lists[ACPI_TABLE_DSDT].next; | |
188 | ||
189 | /* If table already loaded into namespace, just return */ | |
190 | ||
191 | if (table_desc->loaded_into_namespace) { | |
192 | goto unlock_and_exit; | |
193 | } | |
194 | ||
195 | /* Now load the single DSDT */ | |
196 | ||
4be44fcd LB |
197 | status = acpi_ns_load_table(table_desc, acpi_gbl_root_node); |
198 | if (ACPI_SUCCESS(status)) { | |
1da177e4 LT |
199 | table_desc->loaded_into_namespace = TRUE; |
200 | } | |
201 | break; | |
202 | ||
1da177e4 | 203 | case ACPI_TABLE_SSDT: |
0c9938cc | 204 | case ACPI_TABLE_PSDT: |
1da177e4 | 205 | |
4be44fcd LB |
206 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
207 | "Namespace load: %d SSDT or PSDTs\n", | |
208 | acpi_gbl_table_lists[table_type].count)); | |
1da177e4 LT |
209 | |
210 | /* | |
0c9938cc | 211 | * Traverse list of SSDT or PSDT tables |
1da177e4 | 212 | */ |
0c9938cc RM |
213 | table_desc = acpi_gbl_table_lists[table_type].next; |
214 | for (i = 0; i < acpi_gbl_table_lists[table_type].count; i++) { | |
1da177e4 | 215 | /* |
0c9938cc | 216 | * Only attempt to load table into namespace if it is not |
1da177e4 LT |
217 | * already loaded! |
218 | */ | |
219 | if (!table_desc->loaded_into_namespace) { | |
4be44fcd LB |
220 | status = |
221 | acpi_ns_load_table(table_desc, | |
222 | acpi_gbl_root_node); | |
223 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
224 | break; |
225 | } | |
226 | ||
227 | table_desc->loaded_into_namespace = TRUE; | |
228 | } | |
229 | ||
230 | table_desc = table_desc->next; | |
231 | } | |
232 | break; | |
233 | ||
1da177e4 LT |
234 | default: |
235 | status = AE_SUPPORT; | |
236 | break; | |
237 | } | |
238 | ||
4be44fcd LB |
239 | unlock_and_exit: |
240 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); | |
241 | return_ACPI_STATUS(status); | |
1da177e4 LT |
242 | } |
243 | ||
1da177e4 LT |
244 | /******************************************************************************* |
245 | * | |
246 | * FUNCTION: acpi_load_namespace | |
247 | * | |
248 | * PARAMETERS: None | |
249 | * | |
250 | * RETURN: Status | |
251 | * | |
252 | * DESCRIPTION: Load the name space from what ever is pointed to by DSDT. | |
253 | * (DSDT points to either the BIOS or a buffer.) | |
254 | * | |
255 | ******************************************************************************/ | |
256 | ||
4be44fcd | 257 | acpi_status acpi_ns_load_namespace(void) |
1da177e4 | 258 | { |
4be44fcd | 259 | acpi_status status; |
1da177e4 | 260 | |
4be44fcd | 261 | ACPI_FUNCTION_TRACE("acpi_load_name_space"); |
1da177e4 LT |
262 | |
263 | /* There must be at least a DSDT installed */ | |
264 | ||
265 | if (acpi_gbl_DSDT == NULL) { | |
4a90c7e8 | 266 | ACPI_REPORT_ERROR(("DSDT is not in memory\n")); |
4be44fcd | 267 | return_ACPI_STATUS(AE_NO_ACPI_TABLES); |
1da177e4 LT |
268 | } |
269 | ||
270 | /* | |
271 | * Load the namespace. The DSDT is required, | |
272 | * but the SSDT and PSDT tables are optional. | |
273 | */ | |
4be44fcd LB |
274 | status = acpi_ns_load_table_by_type(ACPI_TABLE_DSDT); |
275 | if (ACPI_FAILURE(status)) { | |
276 | return_ACPI_STATUS(status); | |
1da177e4 LT |
277 | } |
278 | ||
279 | /* Ignore exceptions from these */ | |
280 | ||
4be44fcd LB |
281 | (void)acpi_ns_load_table_by_type(ACPI_TABLE_SSDT); |
282 | (void)acpi_ns_load_table_by_type(ACPI_TABLE_PSDT); | |
1da177e4 | 283 | |
4be44fcd LB |
284 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, |
285 | "ACPI Namespace successfully loaded at root %p\n", | |
286 | acpi_gbl_root_node)); | |
1da177e4 | 287 | |
4be44fcd | 288 | return_ACPI_STATUS(status); |
1da177e4 LT |
289 | } |
290 | ||
44f6c012 | 291 | #ifdef ACPI_FUTURE_IMPLEMENTATION |
1da177e4 LT |
292 | /******************************************************************************* |
293 | * | |
294 | * FUNCTION: acpi_ns_delete_subtree | |
295 | * | |
296 | * PARAMETERS: start_handle - Handle in namespace where search begins | |
297 | * | |
298 | * RETURNS Status | |
299 | * | |
300 | * DESCRIPTION: Walks the namespace starting at the given handle and deletes | |
301 | * all objects, entries, and scopes in the entire subtree. | |
302 | * | |
303 | * Namespace/Interpreter should be locked or the subsystem should | |
304 | * be in shutdown before this routine is called. | |
305 | * | |
306 | ******************************************************************************/ | |
307 | ||
4be44fcd | 308 | static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle) |
1da177e4 | 309 | { |
4be44fcd LB |
310 | acpi_status status; |
311 | acpi_handle child_handle; | |
312 | acpi_handle parent_handle; | |
313 | acpi_handle next_child_handle; | |
314 | acpi_handle dummy; | |
315 | u32 level; | |
1da177e4 | 316 | |
4be44fcd | 317 | ACPI_FUNCTION_TRACE("ns_delete_subtree"); |
1da177e4 LT |
318 | |
319 | parent_handle = start_handle; | |
320 | child_handle = NULL; | |
4be44fcd | 321 | level = 1; |
1da177e4 LT |
322 | |
323 | /* | |
324 | * Traverse the tree of objects until we bubble back up | |
325 | * to where we started. | |
326 | */ | |
327 | while (level > 0) { | |
328 | /* Attempt to get the next object in this scope */ | |
329 | ||
4be44fcd LB |
330 | status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle, |
331 | child_handle, &next_child_handle); | |
1da177e4 LT |
332 | |
333 | child_handle = next_child_handle; | |
334 | ||
335 | /* Did we get a new object? */ | |
336 | ||
4be44fcd | 337 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
338 | /* Check if this object has any children */ |
339 | ||
4be44fcd LB |
340 | if (ACPI_SUCCESS |
341 | (acpi_get_next_object | |
342 | (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) { | |
1da177e4 LT |
343 | /* |
344 | * There is at least one child of this object, | |
345 | * visit the object | |
346 | */ | |
347 | level++; | |
348 | parent_handle = child_handle; | |
349 | child_handle = NULL; | |
350 | } | |
4be44fcd | 351 | } else { |
1da177e4 LT |
352 | /* |
353 | * No more children in this object, go back up to | |
354 | * the object's parent | |
355 | */ | |
356 | level--; | |
357 | ||
358 | /* Delete all children now */ | |
359 | ||
4be44fcd | 360 | acpi_ns_delete_children(child_handle); |
1da177e4 LT |
361 | |
362 | child_handle = parent_handle; | |
4be44fcd LB |
363 | status = acpi_get_parent(parent_handle, &parent_handle); |
364 | if (ACPI_FAILURE(status)) { | |
365 | return_ACPI_STATUS(status); | |
1da177e4 LT |
366 | } |
367 | } | |
368 | } | |
369 | ||
370 | /* Now delete the starting object, and we are done */ | |
371 | ||
4be44fcd | 372 | acpi_ns_delete_node(child_handle); |
1da177e4 | 373 | |
4be44fcd | 374 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
375 | } |
376 | ||
1da177e4 LT |
377 | /******************************************************************************* |
378 | * | |
379 | * FUNCTION: acpi_ns_unload_name_space | |
380 | * | |
381 | * PARAMETERS: Handle - Root of namespace subtree to be deleted | |
382 | * | |
383 | * RETURN: Status | |
384 | * | |
385 | * DESCRIPTION: Shrinks the namespace, typically in response to an undocking | |
386 | * event. Deletes an entire subtree starting from (and | |
387 | * including) the given handle. | |
388 | * | |
389 | ******************************************************************************/ | |
390 | ||
4be44fcd | 391 | acpi_status acpi_ns_unload_namespace(acpi_handle handle) |
1da177e4 | 392 | { |
4be44fcd | 393 | acpi_status status; |
1da177e4 | 394 | |
4be44fcd | 395 | ACPI_FUNCTION_TRACE("ns_unload_name_space"); |
1da177e4 LT |
396 | |
397 | /* Parameter validation */ | |
398 | ||
399 | if (!acpi_gbl_root_node) { | |
4be44fcd | 400 | return_ACPI_STATUS(AE_NO_NAMESPACE); |
1da177e4 LT |
401 | } |
402 | ||
403 | if (!handle) { | |
4be44fcd | 404 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
405 | } |
406 | ||
407 | /* This function does the real work */ | |
408 | ||
4be44fcd | 409 | status = acpi_ns_delete_subtree(handle); |
1da177e4 | 410 | |
4be44fcd | 411 | return_ACPI_STATUS(status); |
1da177e4 | 412 | } |
44f6c012 | 413 | #endif |
1da177e4 | 414 | #endif |