1 /******************************************************************************
3 * Module Name: tbxfload - Table load/unload external interfaces
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2015, 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 #define EXPORT_ACPI_INTERFACES
46 #include <acpi/acpi.h>
51 #define _COMPONENT ACPI_TABLES
52 ACPI_MODULE_NAME("tbxfload")
54 /*******************************************************************************
56 * FUNCTION: acpi_load_tables
62 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
64 ******************************************************************************/
65 acpi_status __init acpi_load_tables(void)
69 ACPI_FUNCTION_TRACE(acpi_load_tables);
71 /* Load the namespace from the tables */
73 status = acpi_tb_load_namespace();
75 /* Don't let single failures abort the load */
77 if (status == AE_CTRL_TERMINATE) {
81 if (ACPI_FAILURE(status)) {
82 ACPI_EXCEPTION((AE_INFO, status,
83 "While loading namespace from ACPI tables"));
86 return_ACPI_STATUS(status);
89 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)
91 /*******************************************************************************
93 * FUNCTION: acpi_tb_load_namespace
99 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
102 ******************************************************************************/
103 acpi_status acpi_tb_load_namespace(void)
107 struct acpi_table_header *new_dsdt;
108 struct acpi_table_desc *table;
109 u32 tables_loaded = 0;
110 u32 tables_failed = 0;
112 ACPI_FUNCTION_TRACE(tb_load_namespace);
114 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
117 * Load the namespace. The DSDT is required, but any SSDT and
118 * PSDT tables are optional. Verify the DSDT.
120 table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index];
122 if (!acpi_gbl_root_table_list.current_table_count ||
123 !ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_DSDT) ||
124 ACPI_FAILURE(acpi_tb_validate_table(table))) {
125 status = AE_NO_ACPI_TABLES;
126 goto unlock_and_exit;
130 * Save the DSDT pointer for simple access. This is the mapped memory
131 * address. We must take care here because the address of the .Tables
132 * array can change dynamically as tables are loaded at run-time. Note:
133 * .Pointer field is not validated until after call to acpi_tb_validate_table.
135 acpi_gbl_DSDT = table->pointer;
138 * Optionally copy the entire DSDT to local memory (instead of simply
139 * mapping it.) There are some BIOSs that corrupt or replace the original
140 * DSDT, creating the need for this option. Default is FALSE, do not copy
143 if (acpi_gbl_copy_dsdt_locally) {
144 new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index);
146 acpi_gbl_DSDT = new_dsdt;
151 * Save the original DSDT header for detection of table corruption
152 * and/or replacement of the DSDT from outside the OS.
154 memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
155 sizeof(struct acpi_table_header));
157 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
159 /* Load and parse tables */
161 status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node);
162 if (ACPI_FAILURE(status)) {
163 ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed"));
169 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
171 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
172 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
173 table = &acpi_gbl_root_table_list.tables[i];
175 if (!acpi_gbl_root_table_list.tables[i].address ||
176 (!ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_SSDT)
177 && !ACPI_COMPARE_NAME(table->signature.ascii,
179 && !ACPI_COMPARE_NAME(table->signature.ascii,
181 || ACPI_FAILURE(acpi_tb_validate_table(table))) {
185 /* Ignore errors while loading tables, get as many as possible */
187 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
188 status = acpi_ns_load_table(i, acpi_gbl_root_node);
189 if (ACPI_FAILURE(status)) {
190 ACPI_EXCEPTION((AE_INFO, status,
191 "(%4.4s:%8.8s) while loading table",
192 table->signature.ascii,
193 table->pointer->oem_table_id));
197 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
198 "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n",
199 table->signature.ascii,
200 table->pointer->oem_table_id));
205 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
208 if (!tables_failed) {
210 "%u ACPI AML tables successfully acquired and loaded\n",
214 "%u table load failures, %u successful",
215 tables_failed, tables_loaded));
217 /* Indicate at least one failure */
219 status = AE_CTRL_TERMINATE;
223 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
224 return_ACPI_STATUS(status);
227 /*******************************************************************************
229 * FUNCTION: acpi_install_table
231 * PARAMETERS: address - Address of the ACPI table to be installed.
232 * physical - Whether the address is a physical table
237 * DESCRIPTION: Dynamically install an ACPI table.
238 * Note: This function should only be invoked after
239 * acpi_initialize_tables() and before acpi_load_tables().
241 ******************************************************************************/
244 acpi_install_table(acpi_physical_address address, u8 physical)
250 ACPI_FUNCTION_TRACE(acpi_install_table);
253 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
255 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
258 status = acpi_tb_install_standard_table(address, flags,
259 FALSE, FALSE, &table_index);
261 return_ACPI_STATUS(status);
264 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
266 /*******************************************************************************
268 * FUNCTION: acpi_load_table
270 * PARAMETERS: table - Pointer to a buffer containing the ACPI
271 * table to be loaded.
275 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
276 * be a valid ACPI table with a valid ACPI table header.
277 * Note1: Mainly intended to support hotplug addition of SSDTs.
278 * Note2: Does not copy the incoming table. User is responsible
279 * to ensure that the table is not deleted or unmapped.
281 ******************************************************************************/
282 acpi_status acpi_load_table(struct acpi_table_header *table)
287 ACPI_FUNCTION_TRACE(acpi_load_table);
289 /* Parameter validation */
292 return_ACPI_STATUS(AE_BAD_PARAMETER);
295 /* Must acquire the interpreter lock during this operation */
297 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
298 if (ACPI_FAILURE(status)) {
299 return_ACPI_STATUS(status);
302 /* Install the table and load it into the namespace */
304 ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
305 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
307 status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table),
308 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
309 TRUE, FALSE, &table_index);
311 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
312 if (ACPI_FAILURE(status)) {
313 goto unlock_and_exit;
317 * Note: Now table is "INSTALLED", it must be validated before
321 acpi_tb_validate_table(&acpi_gbl_root_table_list.
322 tables[table_index]);
323 if (ACPI_FAILURE(status)) {
324 goto unlock_and_exit;
327 status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
329 /* Invoke table handler if present */
331 if (acpi_gbl_table_handler) {
332 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
333 acpi_gbl_table_handler_context);
337 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
338 return_ACPI_STATUS(status);
341 ACPI_EXPORT_SYMBOL(acpi_load_table)
343 /*******************************************************************************
345 * FUNCTION: acpi_unload_parent_table
347 * PARAMETERS: object - Handle to any namespace object owned by
348 * the table to be unloaded
352 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
353 * the table and deletes all namespace objects associated with
354 * that table. Unloading of the DSDT is not allowed.
355 * Note: Mainly intended to support hotplug removal of SSDTs.
357 ******************************************************************************/
358 acpi_status acpi_unload_parent_table(acpi_handle object)
360 struct acpi_namespace_node *node =
361 ACPI_CAST_PTR(struct acpi_namespace_node, object);
362 acpi_status status = AE_NOT_EXIST;
363 acpi_owner_id owner_id;
366 ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
368 /* Parameter validation */
371 return_ACPI_STATUS(AE_BAD_PARAMETER);
375 * The node owner_id is currently the same as the parent table ID.
376 * However, this could change in the future.
378 owner_id = node->owner_id;
381 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
383 return_ACPI_STATUS(AE_TYPE);
386 /* Must acquire the interpreter lock during this operation */
388 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
389 if (ACPI_FAILURE(status)) {
390 return_ACPI_STATUS(status);
393 /* Find the table in the global table list */
395 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
396 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
401 * Allow unload of SSDT and OEMx tables only. Do not allow unload
402 * of the DSDT. No other types of tables should get here, since
403 * only these types can contain AML and thus are the only types
404 * that can create namespace objects.
406 if (ACPI_COMPARE_NAME
407 (acpi_gbl_root_table_list.tables[i].signature.ascii,
413 /* Ensure the table is actually loaded */
415 if (!acpi_tb_is_table_loaded(i)) {
416 status = AE_NOT_EXIST;
420 /* Invoke table handler if present */
422 if (acpi_gbl_table_handler) {
423 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
424 acpi_gbl_root_table_list.
426 acpi_gbl_table_handler_context);
430 * Delete all namespace objects owned by this table. Note that
431 * these objects can appear anywhere in the namespace by virtue
432 * of the AML "Scope" operator. Thus, we need to track ownership
433 * by an ID, not simply a position within the hierarchy.
435 status = acpi_tb_delete_namespace_by_owner(i);
436 if (ACPI_FAILURE(status)) {
440 status = acpi_tb_release_owner_id(i);
441 acpi_tb_set_table_loaded_flag(i, FALSE);
445 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
446 return_ACPI_STATUS(status);
449 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)