1 /******************************************************************************
2 *
3 * Module Name: nsload - namespace loading/expanding/contracting procedures
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2007, 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 #include <acpi/acpi.h>
45 #include <acpi/acnamesp.h>
46 #include <acpi/acdispat.h>
47 #include <acpi/actables.h>
48
49 #define _COMPONENT ACPI_NAMESPACE
50 ACPI_MODULE_NAME("nsload")
51
52 /* Local prototypes */
53 #ifdef ACPI_FUTURE_IMPLEMENTATION
54 acpi_status acpi_ns_unload_namespace(acpi_handle handle);
55
56 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle);
57 #endif
58
59 #ifndef ACPI_NO_METHOD_EXECUTION
60 /*******************************************************************************
61 *
62 * FUNCTION: acpi_ns_load_table
63 *
64 * PARAMETERS: table_index - Index for table to be loaded
65 * Node - Owning NS node
66 *
67 * RETURN: Status
68 *
69 * DESCRIPTION: Load one ACPI table into the namespace
70 *
71 ******************************************************************************/
72
73 acpi_status
74 acpi_ns_load_table(acpi_native_uint table_index,
75 struct acpi_namespace_node *node)
76 {
77 acpi_status status;
78
79 ACPI_FUNCTION_TRACE(ns_load_table);
80
81 /*
82 * Parse the table and load the namespace with all named
83 * objects found within. Control methods are NOT parsed
84 * at this time. In fact, the control methods cannot be
85 * parsed until the entire namespace is loaded, because
86 * if a control method makes a forward reference (call)
87 * to another control method, we can't continue parsing
88 * because we don't know how many arguments to parse next!
89 */
90 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
91 if (ACPI_FAILURE(status)) {
92 return_ACPI_STATUS(status);
93 }
94
95 /* If table already loaded into namespace, just return */
96
97 if (acpi_tb_is_table_loaded(table_index)) {
98 status = AE_ALREADY_EXISTS;
99 goto unlock;
100 }
101
102 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
103 "**** Loading table into namespace ****\n"));
104
105 status = acpi_tb_allocate_owner_id(table_index);
106 if (ACPI_FAILURE(status)) {
107 goto unlock;
108 }
109
110 status = acpi_ns_parse_table(table_index, node->child);
111 if (ACPI_SUCCESS(status)) {
112 acpi_tb_set_table_loaded_flag(table_index, TRUE);
113 } else {
114 acpi_tb_release_owner_id(table_index);
115 }
116
117 unlock:
118 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
119
120 if (ACPI_FAILURE(status)) {
121 return_ACPI_STATUS(status);
122 }
123
124 /*
125 * Now we can parse the control methods. We always parse
126 * them here for a sanity check, and if configured for
127 * just-in-time parsing, we delete the control method
128 * parse trees.
129 */
130 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
131 "**** Begin Table Method Parsing and Object Initialization ****\n"));
132
133 status = acpi_ds_initialize_objects(table_index, node);
134
135 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
136 "**** Completed Table Method Parsing and Object Initialization ****\n"));
137
138 return_ACPI_STATUS(status);
139 }
140
141 #ifdef ACPI_OBSOLETE_FUNCTIONS
142 /*******************************************************************************
143 *
144 * FUNCTION: acpi_load_namespace
145 *
146 * PARAMETERS: None
147 *
148 * RETURN: Status
149 *
150 * DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
151 * (DSDT points to either the BIOS or a buffer.)
152 *
153 ******************************************************************************/
154
155 acpi_status acpi_ns_load_namespace(void)
156 {
157 acpi_status status;
158
159 ACPI_FUNCTION_TRACE(acpi_load_name_space);
160
161 /* There must be at least a DSDT installed */
162
163 if (acpi_gbl_DSDT == NULL) {
164 ACPI_ERROR((AE_INFO, "DSDT is not in memory"));
165 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
166 }
167
168 /*
169 * Load the namespace. The DSDT is required,
170 * but the SSDT and PSDT tables are optional.
171 */
172 status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT);
173 if (ACPI_FAILURE(status)) {
174 return_ACPI_STATUS(status);
175 }
176
177 /* Ignore exceptions from these */
178
179 (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT);
180 (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT);
181
182 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
183 "ACPI Namespace successfully loaded at root %p\n",
184 acpi_gbl_root_node));
185
186 return_ACPI_STATUS(status);
187 }
188 #endif
189
190 #ifdef ACPI_FUTURE_IMPLEMENTATION
191 /*******************************************************************************
192 *
193 * FUNCTION: acpi_ns_delete_subtree
194 *
195 * PARAMETERS: start_handle - Handle in namespace where search begins
196 *
197 * RETURNS Status
198 *
199 * DESCRIPTION: Walks the namespace starting at the given handle and deletes
200 * all objects, entries, and scopes in the entire subtree.
201 *
202 * Namespace/Interpreter should be locked or the subsystem should
203 * be in shutdown before this routine is called.
204 *
205 ******************************************************************************/
206
207 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle)
208 {
209 acpi_status status;
210 acpi_handle child_handle;
211 acpi_handle parent_handle;
212 acpi_handle next_child_handle;
213 acpi_handle dummy;
214 u32 level;
215
216 ACPI_FUNCTION_TRACE(ns_delete_subtree);
217
218 parent_handle = start_handle;
219 child_handle = NULL;
220 level = 1;
221
222 /*
223 * Traverse the tree of objects until we bubble back up
224 * to where we started.
225 */
226 while (level > 0) {
227
228 /* Attempt to get the next object in this scope */
229
230 status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle,
231 child_handle, &next_child_handle);
232
233 child_handle = next_child_handle;
234
235 /* Did we get a new object? */
236
237 if (ACPI_SUCCESS(status)) {
238
239 /* Check if this object has any children */
240
241 if (ACPI_SUCCESS
242 (acpi_get_next_object
243 (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) {
244 /*
245 * There is at least one child of this object,
246 * visit the object
247 */
248 level++;
249 parent_handle = child_handle;
250 child_handle = NULL;
251 }
252 } else {
253 /*
254 * No more children in this object, go back up to
255 * the object's parent
256 */
257 level--;
258
259 /* Delete all children now */
260
261 acpi_ns_delete_children(child_handle);
262
263 child_handle = parent_handle;
264 status = acpi_get_parent(parent_handle, &parent_handle);
265 if (ACPI_FAILURE(status)) {
266 return_ACPI_STATUS(status);
267 }
268 }
269 }
270
271 /* Now delete the starting object, and we are done */
272
273 acpi_ns_delete_node(child_handle);
274
275 return_ACPI_STATUS(AE_OK);
276 }
277
278 /*******************************************************************************
279 *
280 * FUNCTION: acpi_ns_unload_name_space
281 *
282 * PARAMETERS: Handle - Root of namespace subtree to be deleted
283 *
284 * RETURN: Status
285 *
286 * DESCRIPTION: Shrinks the namespace, typically in response to an undocking
287 * event. Deletes an entire subtree starting from (and
288 * including) the given handle.
289 *
290 ******************************************************************************/
291
292 acpi_status acpi_ns_unload_namespace(acpi_handle handle)
293 {
294 acpi_status status;
295
296 ACPI_FUNCTION_TRACE(ns_unload_name_space);
297
298 /* Parameter validation */
299
300 if (!acpi_gbl_root_node) {
301 return_ACPI_STATUS(AE_NO_NAMESPACE);
302 }
303
304 if (!handle) {
305 return_ACPI_STATUS(AE_BAD_PARAMETER);
306 }
307
308 /* This function does the real work */
309
310 status = acpi_ns_delete_subtree(handle);
311
312 return_ACPI_STATUS(status);
313 }
314 #endif
315 #endif
316
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