1 /******************************************************************************
3 * Module Name: nsload - namespace loading/expanding/contracting procedures
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2008, Intel Corp.
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44 #include <acpi/acpi.h>
45 #include <acpi/acnamesp.h>
46 #include <acpi/acdispat.h>
47 #include <acpi/actables.h>
49 #define _COMPONENT ACPI_NAMESPACE
50 ACPI_MODULE_NAME("nsload")
52 /* Local prototypes */
53 #ifdef ACPI_FUTURE_IMPLEMENTATION
54 acpi_status acpi_ns_unload_namespace(acpi_handle handle);
56 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle);
59 #ifndef ACPI_NO_METHOD_EXECUTION
60 /*******************************************************************************
62 * FUNCTION: acpi_ns_load_table
64 * PARAMETERS: table_index - Index for table to be loaded
65 * Node - Owning NS node
69 * DESCRIPTION: Load one ACPI table into the namespace
71 ******************************************************************************/
74 acpi_ns_load_table(u32 table_index, struct acpi_namespace_node *node)
78 ACPI_FUNCTION_TRACE(ns_load_table);
81 * Parse the table and load the namespace with all named
82 * objects found within. Control methods are NOT parsed
83 * at this time. In fact, the control methods cannot be
84 * parsed until the entire namespace is loaded, because
85 * if a control method makes a forward reference (call)
86 * to another control method, we can't continue parsing
87 * because we don't know how many arguments to parse next!
89 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
90 if (ACPI_FAILURE(status)) {
91 return_ACPI_STATUS(status);
94 /* If table already loaded into namespace, just return */
96 if (acpi_tb_is_table_loaded(table_index)) {
97 status = AE_ALREADY_EXISTS;
101 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
102 "**** Loading table into namespace ****\n"));
104 status = acpi_tb_allocate_owner_id(table_index);
105 if (ACPI_FAILURE(status)) {
109 status = acpi_ns_parse_table(table_index, node);
110 if (ACPI_SUCCESS(status)) {
111 acpi_tb_set_table_loaded_flag(table_index, TRUE);
113 (void)acpi_tb_release_owner_id(table_index);
117 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
119 if (ACPI_FAILURE(status)) {
120 return_ACPI_STATUS(status);
124 * Now we can parse the control methods. We always parse
125 * them here for a sanity check, and if configured for
126 * just-in-time parsing, we delete the control method
129 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
130 "**** Begin Table Method Parsing and Object Initialization ****\n"));
132 status = acpi_ds_initialize_objects(table_index, node);
134 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
135 "**** Completed Table Method Parsing and Object Initialization ****\n"));
137 return_ACPI_STATUS(status);
140 #ifdef ACPI_OBSOLETE_FUNCTIONS
141 /*******************************************************************************
143 * FUNCTION: acpi_load_namespace
149 * DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
150 * (DSDT points to either the BIOS or a buffer.)
152 ******************************************************************************/
154 acpi_status acpi_ns_load_namespace(void)
158 ACPI_FUNCTION_TRACE(acpi_load_name_space);
160 /* There must be at least a DSDT installed */
162 if (acpi_gbl_DSDT == NULL) {
163 ACPI_ERROR((AE_INFO, "DSDT is not in memory"));
164 return_ACPI_STATUS(AE_NO_ACPI_TABLES);
168 * Load the namespace. The DSDT is required,
169 * but the SSDT and PSDT tables are optional.
171 status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT);
172 if (ACPI_FAILURE(status)) {
173 return_ACPI_STATUS(status);
176 /* Ignore exceptions from these */
178 (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT);
179 (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT);
181 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
182 "ACPI Namespace successfully loaded at root %p\n",
183 acpi_gbl_root_node));
185 return_ACPI_STATUS(status);
189 #ifdef ACPI_FUTURE_IMPLEMENTATION
190 /*******************************************************************************
192 * FUNCTION: acpi_ns_delete_subtree
194 * PARAMETERS: start_handle - Handle in namespace where search begins
198 * DESCRIPTION: Walks the namespace starting at the given handle and deletes
199 * all objects, entries, and scopes in the entire subtree.
201 * Namespace/Interpreter should be locked or the subsystem should
202 * be in shutdown before this routine is called.
204 ******************************************************************************/
206 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle)
209 acpi_handle child_handle;
210 acpi_handle parent_handle;
211 acpi_handle next_child_handle;
215 ACPI_FUNCTION_TRACE(ns_delete_subtree);
217 parent_handle = start_handle;
222 * Traverse the tree of objects until we bubble back up
223 * to where we started.
227 /* Attempt to get the next object in this scope */
229 status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle,
230 child_handle, &next_child_handle);
232 child_handle = next_child_handle;
234 /* Did we get a new object? */
236 if (ACPI_SUCCESS(status)) {
238 /* Check if this object has any children */
241 (acpi_get_next_object
242 (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) {
244 * There is at least one child of this object,
248 parent_handle = child_handle;
253 * No more children in this object, go back up to
254 * the object's parent
258 /* Delete all children now */
260 acpi_ns_delete_children(child_handle);
262 child_handle = parent_handle;
263 status = acpi_get_parent(parent_handle, &parent_handle);
264 if (ACPI_FAILURE(status)) {
265 return_ACPI_STATUS(status);
270 /* Now delete the starting object, and we are done */
272 acpi_ns_delete_node(child_handle);
274 return_ACPI_STATUS(AE_OK);
277 /*******************************************************************************
279 * FUNCTION: acpi_ns_unload_name_space
281 * PARAMETERS: Handle - Root of namespace subtree to be deleted
285 * DESCRIPTION: Shrinks the namespace, typically in response to an undocking
286 * event. Deletes an entire subtree starting from (and
287 * including) the given handle.
289 ******************************************************************************/
291 acpi_status acpi_ns_unload_namespace(acpi_handle handle)
295 ACPI_FUNCTION_TRACE(ns_unload_name_space);
297 /* Parameter validation */
299 if (!acpi_gbl_root_node) {
300 return_ACPI_STATUS(AE_NO_NAMESPACE);
304 return_ACPI_STATUS(AE_BAD_PARAMETER);
307 /* This function does the real work */
309 status = acpi_ns_delete_subtree(handle);
311 return_ACPI_STATUS(status);