1 /******************************************************************************
3 * Module Name: tbxfload - Table load/unload external interfaces
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2016, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
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
28 * Software Foundation.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
44 #define EXPORT_ACPI_INTERFACES
46 #include <acpi/acpi.h>
52 #define _COMPONENT ACPI_TABLES
53 ACPI_MODULE_NAME("tbxfload")
55 /*******************************************************************************
57 * FUNCTION: acpi_load_tables
63 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
65 ******************************************************************************/
66 acpi_status __init acpi_load_tables(void)
70 ACPI_FUNCTION_TRACE(acpi_load_tables);
73 * Install the default operation region handlers. These are the
74 * handlers that are defined by the ACPI specification to be
75 * "always accessible" -- namely, system_memory, system_IO, and
76 * PCI_Config. This also means that no _REG methods need to be
77 * run for these address spaces. We need to have these handlers
78 * installed before any AML code can be executed, especially any
79 * module-level code (11/2015).
80 * Note that we allow OSPMs to install their own region handlers
81 * between acpi_initialize_subsystem() and acpi_load_tables() to use
82 * their customized default region handlers.
84 if (acpi_gbl_group_module_level_code) {
85 status = acpi_ev_install_region_handlers();
86 if (ACPI_FAILURE(status) && status != AE_ALREADY_EXISTS) {
87 ACPI_EXCEPTION((AE_INFO, status,
88 "During Region initialization"));
89 return_ACPI_STATUS(status);
93 /* Load the namespace from the tables */
95 status = acpi_tb_load_namespace();
97 /* Don't let single failures abort the load */
99 if (status == AE_CTRL_TERMINATE) {
103 if (ACPI_FAILURE(status)) {
104 ACPI_EXCEPTION((AE_INFO, status,
105 "While loading namespace from ACPI tables"));
108 return_ACPI_STATUS(status);
111 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)
113 /*******************************************************************************
115 * FUNCTION: acpi_tb_load_namespace
121 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
124 ******************************************************************************/
125 acpi_status acpi_tb_load_namespace(void)
129 struct acpi_table_header *new_dsdt;
130 struct acpi_table_desc *table;
131 u32 tables_loaded = 0;
132 u32 tables_failed = 0;
134 ACPI_FUNCTION_TRACE(tb_load_namespace);
136 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
139 * Load the namespace. The DSDT is required, but any SSDT and
140 * PSDT tables are optional. Verify the DSDT.
142 table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index];
144 if (!acpi_gbl_root_table_list.current_table_count ||
145 !ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_DSDT) ||
146 ACPI_FAILURE(acpi_tb_validate_table(table))) {
147 status = AE_NO_ACPI_TABLES;
148 goto unlock_and_exit;
152 * Save the DSDT pointer for simple access. This is the mapped memory
153 * address. We must take care here because the address of the .Tables
154 * array can change dynamically as tables are loaded at run-time. Note:
155 * .Pointer field is not validated until after call to acpi_tb_validate_table.
157 acpi_gbl_DSDT = table->pointer;
160 * Optionally copy the entire DSDT to local memory (instead of simply
161 * mapping it.) There are some BIOSs that corrupt or replace the original
162 * DSDT, creating the need for this option. Default is FALSE, do not copy
165 if (acpi_gbl_copy_dsdt_locally) {
166 new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index);
168 acpi_gbl_DSDT = new_dsdt;
173 * Save the original DSDT header for detection of table corruption
174 * and/or replacement of the DSDT from outside the OS.
176 memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
177 sizeof(struct acpi_table_header));
179 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
181 /* Load and parse tables */
183 status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node);
184 if (ACPI_FAILURE(status)) {
185 ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed"));
191 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
193 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
194 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
195 table = &acpi_gbl_root_table_list.tables[i];
197 if (!acpi_gbl_root_table_list.tables[i].address ||
198 (!ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_SSDT)
199 && !ACPI_COMPARE_NAME(table->signature.ascii,
201 && !ACPI_COMPARE_NAME(table->signature.ascii,
203 || ACPI_FAILURE(acpi_tb_validate_table(table))) {
207 /* Ignore errors while loading tables, get as many as possible */
209 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
210 status = acpi_ns_load_table(i, acpi_gbl_root_node);
211 if (ACPI_FAILURE(status)) {
212 ACPI_EXCEPTION((AE_INFO, status,
213 "(%4.4s:%8.8s) while loading table",
214 table->signature.ascii,
215 table->pointer->oem_table_id));
219 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
220 "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n",
221 table->signature.ascii,
222 table->pointer->oem_table_id));
227 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
230 if (!tables_failed) {
231 ACPI_INFO(("%u ACPI AML tables successfully acquired and loaded\n", tables_loaded));
234 "%u table load failures, %u successful",
235 tables_failed, tables_loaded));
237 /* Indicate at least one failure */
239 status = AE_CTRL_TERMINATE;
243 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
244 return_ACPI_STATUS(status);
247 /*******************************************************************************
249 * FUNCTION: acpi_install_table
251 * PARAMETERS: address - Address of the ACPI table to be installed.
252 * physical - Whether the address is a physical table
257 * DESCRIPTION: Dynamically install an ACPI table.
258 * Note: This function should only be invoked after
259 * acpi_initialize_tables() and before acpi_load_tables().
261 ******************************************************************************/
264 acpi_install_table(acpi_physical_address address, u8 physical)
270 ACPI_FUNCTION_TRACE(acpi_install_table);
273 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
275 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
278 status = acpi_tb_install_standard_table(address, flags,
279 FALSE, FALSE, &table_index);
281 return_ACPI_STATUS(status);
284 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
286 /*******************************************************************************
288 * FUNCTION: acpi_load_table
290 * PARAMETERS: table - Pointer to a buffer containing the ACPI
291 * table to be loaded.
295 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
296 * be a valid ACPI table with a valid ACPI table header.
297 * Note1: Mainly intended to support hotplug addition of SSDTs.
298 * Note2: Does not copy the incoming table. User is responsible
299 * to ensure that the table is not deleted or unmapped.
301 ******************************************************************************/
302 acpi_status acpi_load_table(struct acpi_table_header *table)
307 ACPI_FUNCTION_TRACE(acpi_load_table);
309 /* Parameter validation */
312 return_ACPI_STATUS(AE_BAD_PARAMETER);
315 /* Must acquire the interpreter lock during this operation */
317 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
318 if (ACPI_FAILURE(status)) {
319 return_ACPI_STATUS(status);
322 /* Install the table and load it into the namespace */
324 ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));
325 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
327 status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table),
328 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
329 TRUE, FALSE, &table_index);
331 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
332 if (ACPI_FAILURE(status)) {
333 goto unlock_and_exit;
337 * Note: Now table is "INSTALLED", it must be validated before
341 acpi_tb_validate_table(&acpi_gbl_root_table_list.
342 tables[table_index]);
343 if (ACPI_FAILURE(status)) {
344 goto unlock_and_exit;
347 status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
349 /* Invoke table handler if present */
351 if (acpi_gbl_table_handler) {
352 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
353 acpi_gbl_table_handler_context);
357 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
358 return_ACPI_STATUS(status);
361 ACPI_EXPORT_SYMBOL(acpi_load_table)
363 /*******************************************************************************
365 * FUNCTION: acpi_unload_parent_table
367 * PARAMETERS: object - Handle to any namespace object owned by
368 * the table to be unloaded
372 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
373 * the table and deletes all namespace objects associated with
374 * that table. Unloading of the DSDT is not allowed.
375 * Note: Mainly intended to support hotplug removal of SSDTs.
377 ******************************************************************************/
378 acpi_status acpi_unload_parent_table(acpi_handle object)
380 struct acpi_namespace_node *node =
381 ACPI_CAST_PTR(struct acpi_namespace_node, object);
382 acpi_status status = AE_NOT_EXIST;
383 acpi_owner_id owner_id;
386 ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
388 /* Parameter validation */
391 return_ACPI_STATUS(AE_BAD_PARAMETER);
395 * The node owner_id is currently the same as the parent table ID.
396 * However, this could change in the future.
398 owner_id = node->owner_id;
401 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
403 return_ACPI_STATUS(AE_TYPE);
406 /* Must acquire the interpreter lock during this operation */
408 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
409 if (ACPI_FAILURE(status)) {
410 return_ACPI_STATUS(status);
413 /* Find the table in the global table list */
415 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
416 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
421 * Allow unload of SSDT and OEMx tables only. Do not allow unload
422 * of the DSDT. No other types of tables should get here, since
423 * only these types can contain AML and thus are the only types
424 * that can create namespace objects.
426 if (ACPI_COMPARE_NAME
427 (acpi_gbl_root_table_list.tables[i].signature.ascii,
433 /* Ensure the table is actually loaded */
435 if (!acpi_tb_is_table_loaded(i)) {
436 status = AE_NOT_EXIST;
440 /* Invoke table handler if present */
442 if (acpi_gbl_table_handler) {
443 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
444 acpi_gbl_root_table_list.
446 acpi_gbl_table_handler_context);
450 * Delete all namespace objects owned by this table. Note that
451 * these objects can appear anywhere in the namespace by virtue
452 * of the AML "Scope" operator. Thus, we need to track ownership
453 * by an ID, not simply a position within the hierarchy.
455 status = acpi_tb_delete_namespace_by_owner(i);
456 if (ACPI_FAILURE(status)) {
460 status = acpi_tb_release_owner_id(i);
461 acpi_tb_set_table_loaded_flag(i, FALSE);
465 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
466 return_ACPI_STATUS(status);
469 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)