1 /******************************************************************************
3 * Module Name: nsload - namespace loading/expanding/contracting procedures
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2008, Intel Corp.
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20 * including a substantially similar Disclaimer requirement for further
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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.
26 * Alternatively, this software may be distributed under the terms of the
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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
);