1 /******************************************************************************
3 * Module Name: tbxfload - Table load/unload external interfaces
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2014, Intel Corp.
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12 * modification, are permitted provided that the following conditions
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20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
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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
27 * GNU General Public License ("GPL") version 2 as published by the Free
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44 #define EXPORT_ACPI_INTERFACES
46 #include <acpi/acpi.h>
51 #define _COMPONENT ACPI_TABLES
52 ACPI_MODULE_NAME("tbxfload")
54 /* Local prototypes */
55 static acpi_status acpi_tb_load_namespace(void);
57 /*******************************************************************************
59 * FUNCTION: acpi_load_tables
65 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
67 ******************************************************************************/
69 acpi_status __init acpi_load_tables(void)
73 ACPI_FUNCTION_TRACE(acpi_load_tables);
75 /* Load the namespace from the tables */
77 status = acpi_tb_load_namespace();
78 if (ACPI_FAILURE(status)) {
79 ACPI_EXCEPTION((AE_INFO, status,
80 "While loading namespace from ACPI tables"));
83 return_ACPI_STATUS(status);
86 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)
88 /*******************************************************************************
90 * FUNCTION: acpi_tb_load_namespace
96 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
99 ******************************************************************************/
100 static acpi_status acpi_tb_load_namespace(void)
104 struct acpi_table_header *new_dsdt;
106 ACPI_FUNCTION_TRACE(tb_load_namespace);
108 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
111 * Load the namespace. The DSDT is required, but any SSDT and
112 * PSDT tables are optional. Verify the DSDT.
114 if (!acpi_gbl_root_table_list.current_table_count ||
116 (acpi_gbl_root_table_list.
117 tables[ACPI_TABLE_INDEX_DSDT].signature),
120 ACPI_FAILURE(acpi_tb_validate_table
121 (&acpi_gbl_root_table_list.
122 tables[ACPI_TABLE_INDEX_DSDT]))) {
123 status = AE_NO_ACPI_TABLES;
124 goto unlock_and_exit;
128 * Save the DSDT pointer for simple access. This is the mapped memory
129 * address. We must take care here because the address of the .Tables
130 * array can change dynamically as tables are loaded at run-time. Note:
131 * .Pointer field is not validated until after call to acpi_tb_validate_table.
134 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer;
137 * Optionally copy the entire DSDT to local memory (instead of simply
138 * mapping it.) There are some BIOSs that corrupt or replace the original
139 * DSDT, creating the need for this option. Default is FALSE, do not copy
142 if (acpi_gbl_copy_dsdt_locally) {
143 new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT);
145 acpi_gbl_DSDT = new_dsdt;
150 * Save the original DSDT header for detection of table corruption
151 * and/or replacement of the DSDT from outside the OS.
153 ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
154 sizeof(struct acpi_table_header));
156 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
158 /* Load and parse tables */
160 status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
161 if (ACPI_FAILURE(status)) {
162 return_ACPI_STATUS(status);
165 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
167 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
168 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
169 if ((!ACPI_COMPARE_NAME
170 (&(acpi_gbl_root_table_list.tables[i].signature),
174 (acpi_gbl_root_table_list.tables[i].
175 signature), ACPI_SIG_PSDT))
177 ACPI_FAILURE(acpi_tb_validate_table
178 (&acpi_gbl_root_table_list.tables[i]))) {
183 * Optionally do not load any SSDTs from the RSDT/XSDT. This can
184 * be useful for debugging ACPI problems on some machines.
186 if (acpi_gbl_disable_ssdt_table_load) {
187 ACPI_INFO((AE_INFO, "Ignoring %4.4s at %p",
188 acpi_gbl_root_table_list.tables[i].signature.
189 ascii, ACPI_CAST_PTR(void,
190 acpi_gbl_root_table_list.
191 tables[i].address)));
195 /* Ignore errors while loading tables, get as many as possible */
197 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
198 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
199 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
202 ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired"));
205 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
206 return_ACPI_STATUS(status);
209 /*******************************************************************************
211 * FUNCTION: acpi_load_table
213 * PARAMETERS: table - Pointer to a buffer containing the ACPI
214 * table to be loaded.
218 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
219 * be a valid ACPI table with a valid ACPI table header.
220 * Note1: Mainly intended to support hotplug addition of SSDTs.
221 * Note2: Does not copy the incoming table. User is responsible
222 * to ensure that the table is not deleted or unmapped.
224 ******************************************************************************/
226 acpi_status acpi_load_table(struct acpi_table_header *table)
231 ACPI_FUNCTION_TRACE(acpi_load_table);
233 /* Parameter validation */
236 return_ACPI_STATUS(AE_BAD_PARAMETER);
239 /* Must acquire the interpreter lock during this operation */
241 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
242 if (ACPI_FAILURE(status)) {
243 return_ACPI_STATUS(status);
246 /* Install the table and load it into the namespace */
248 ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
249 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
250 status = acpi_tb_install_non_fixed_table(ACPI_PTR_TO_PHYSADDR(table),
251 ACPI_TABLE_ORIGIN_UNKNOWN,
253 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
254 if (ACPI_FAILURE(status)) {
255 goto unlock_and_exit;
259 * Note: Now table is "INSTALLED", it must be validated before
263 acpi_tb_validate_table(&acpi_gbl_root_table_list.
264 tables[table_index]);
265 if (ACPI_FAILURE(status)) {
266 goto unlock_and_exit;
269 status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
271 /* Invoke table handler if present */
273 if (acpi_gbl_table_handler) {
274 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
275 acpi_gbl_table_handler_context);
279 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
280 return_ACPI_STATUS(status);
283 ACPI_EXPORT_SYMBOL(acpi_load_table)
285 /*******************************************************************************
287 * FUNCTION: acpi_unload_parent_table
289 * PARAMETERS: object - Handle to any namespace object owned by
290 * the table to be unloaded
294 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
295 * the table and deletes all namespace objects associated with
296 * that table. Unloading of the DSDT is not allowed.
297 * Note: Mainly intended to support hotplug removal of SSDTs.
299 ******************************************************************************/
300 acpi_status acpi_unload_parent_table(acpi_handle object)
302 struct acpi_namespace_node *node =
303 ACPI_CAST_PTR(struct acpi_namespace_node, object);
304 acpi_status status = AE_NOT_EXIST;
305 acpi_owner_id owner_id;
308 ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
310 /* Parameter validation */
313 return_ACPI_STATUS(AE_BAD_PARAMETER);
317 * The node owner_id is currently the same as the parent table ID.
318 * However, this could change in the future.
320 owner_id = node->owner_id;
323 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
325 return_ACPI_STATUS(AE_TYPE);
328 /* Must acquire the interpreter lock during this operation */
330 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
331 if (ACPI_FAILURE(status)) {
332 return_ACPI_STATUS(status);
335 /* Find the table in the global table list */
337 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
338 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
343 * Allow unload of SSDT and OEMx tables only. Do not allow unload
344 * of the DSDT. No other types of tables should get here, since
345 * only these types can contain AML and thus are the only types
346 * that can create namespace objects.
348 if (ACPI_COMPARE_NAME
349 (acpi_gbl_root_table_list.tables[i].signature.ascii,
355 /* Ensure the table is actually loaded */
357 if (!acpi_tb_is_table_loaded(i)) {
358 status = AE_NOT_EXIST;
362 /* Invoke table handler if present */
364 if (acpi_gbl_table_handler) {
365 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
366 acpi_gbl_root_table_list.
368 acpi_gbl_table_handler_context);
372 * Delete all namespace objects owned by this table. Note that
373 * these objects can appear anywhere in the namespace by virtue
374 * of the AML "Scope" operator. Thus, we need to track ownership
375 * by an ID, not simply a position within the hierarchy.
377 status = acpi_tb_delete_namespace_by_owner(i);
378 if (ACPI_FAILURE(status)) {
382 status = acpi_tb_release_owner_id(i);
383 acpi_tb_set_table_loaded_flag(i, FALSE);
387 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
388 return_ACPI_STATUS(status);
391 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)