1 /******************************************************************************
3 * Module Name: nsload - namespace loading/expanding/contracting procedures
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2008, Intel Corp.
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
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44 #include <acpi/acpi.h>
50 #define _COMPONENT ACPI_NAMESPACE
51 ACPI_MODULE_NAME("nsload")
53 /* Local prototypes */
54 #ifdef ACPI_FUTURE_IMPLEMENTATION
55 acpi_status acpi_ns_unload_namespace(acpi_handle handle);
57 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle);
60 #ifndef ACPI_NO_METHOD_EXECUTION
61 /*******************************************************************************
63 * FUNCTION: acpi_ns_load_table
65 * PARAMETERS: table_index - Index for table to be loaded
66 * Node - Owning NS node
70 * DESCRIPTION: Load one ACPI table into the namespace
72 ******************************************************************************/
75 acpi_ns_load_table(u32 table_index, struct acpi_namespace_node *node)
79 ACPI_FUNCTION_TRACE(ns_load_table);
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!
90 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
91 if (ACPI_FAILURE(status)) {
92 return_ACPI_STATUS(status);
95 /* If table already loaded into namespace, just return */
97 if (acpi_tb_is_table_loaded(table_index)) {
98 status = AE_ALREADY_EXISTS;
102 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
103 "**** Loading table into namespace ****\n"));
105 status = acpi_tb_allocate_owner_id(table_index);
106 if (ACPI_FAILURE(status)) {
110 status = acpi_ns_parse_table(table_index, node);
111 if (ACPI_SUCCESS(status)) {
112 acpi_tb_set_table_loaded_flag(table_index, TRUE);
114 (void)acpi_tb_release_owner_id(table_index);
118 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
120 if (ACPI_FAILURE(status)) {
121 return_ACPI_STATUS(status);
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
130 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
131 "**** Begin Table Method Parsing and Object Initialization ****\n"));
133 status = acpi_ds_initialize_objects(table_index, node);
135 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
136 "**** Completed Table Method Parsing and Object Initialization ****\n"));
138 return_ACPI_STATUS(status);
141 #ifdef ACPI_OBSOLETE_FUNCTIONS
142 /*******************************************************************************
144 * FUNCTION: acpi_load_namespace
150 * DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
151 * (DSDT points to either the BIOS or a buffer.)
153 ******************************************************************************/
155 acpi_status acpi_ns_load_namespace(void)
159 ACPI_FUNCTION_TRACE(acpi_load_name_space);
161 /* There must be at least a DSDT installed */
163 if (acpi_gbl_DSDT == NULL) {
164 ACPI_ERROR((AE_INFO, "DSDT is not in memory"));
165 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
169 * Load the namespace. The DSDT is required,
170 * but the SSDT and PSDT tables are optional.
172 status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT);
173 if (ACPI_FAILURE(status)) {
174 return_ACPI_STATUS(status);
177 /* Ignore exceptions from these */
179 (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT);
180 (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT);
182 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
183 "ACPI Namespace successfully loaded at root %p\n",
184 acpi_gbl_root_node));
186 return_ACPI_STATUS(status);
190 #ifdef ACPI_FUTURE_IMPLEMENTATION
191 /*******************************************************************************
193 * FUNCTION: acpi_ns_delete_subtree
195 * PARAMETERS: start_handle - Handle in namespace where search begins
199 * DESCRIPTION: Walks the namespace starting at the given handle and deletes
200 * all objects, entries, and scopes in the entire subtree.
202 * Namespace/Interpreter should be locked or the subsystem should
203 * be in shutdown before this routine is called.
205 ******************************************************************************/
207 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle)
210 acpi_handle child_handle;
211 acpi_handle parent_handle;
212 acpi_handle next_child_handle;
216 ACPI_FUNCTION_TRACE(ns_delete_subtree);
218 parent_handle = start_handle;
223 * Traverse the tree of objects until we bubble back up
224 * to where we started.
228 /* Attempt to get the next object in this scope */
230 status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle,
231 child_handle, &next_child_handle);
233 child_handle = next_child_handle;
235 /* Did we get a new object? */
237 if (ACPI_SUCCESS(status)) {
239 /* Check if this object has any children */
242 (acpi_get_next_object
243 (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) {
245 * There is at least one child of this object,
249 parent_handle = child_handle;
254 * No more children in this object, go back up to
255 * the object's parent
259 /* Delete all children now */
261 acpi_ns_delete_children(child_handle);
263 child_handle = parent_handle;
264 status = acpi_get_parent(parent_handle, &parent_handle);
265 if (ACPI_FAILURE(status)) {
266 return_ACPI_STATUS(status);
271 /* Now delete the starting object, and we are done */
273 acpi_ns_delete_node(child_handle);
275 return_ACPI_STATUS(AE_OK);
278 /*******************************************************************************
280 * FUNCTION: acpi_ns_unload_name_space
282 * PARAMETERS: Handle - Root of namespace subtree to be deleted
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.
290 ******************************************************************************/
292 acpi_status acpi_ns_unload_namespace(acpi_handle handle)
296 ACPI_FUNCTION_TRACE(ns_unload_name_space);
298 /* Parameter validation */
300 if (!acpi_gbl_root_node) {
301 return_ACPI_STATUS(AE_NO_NAMESPACE);
305 return_ACPI_STATUS(AE_BAD_PARAMETER);
308 /* This function does the real work */
310 status = acpi_ns_delete_subtree(handle);
312 return_ACPI_STATUS(status);