1 /******************************************************************************
3 * Module Name: tbxfload - Table load/unload external interfaces
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2015, 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]))) {
182 /* Ignore errors while loading tables, get as many as possible */
184 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
185 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
186 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
189 ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired"));
192 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
193 return_ACPI_STATUS(status);
196 /*******************************************************************************
198 * FUNCTION: acpi_install_table
200 * PARAMETERS: address - Address of the ACPI table to be installed.
201 * physical - Whether the address is a physical table
206 * DESCRIPTION: Dynamically install an ACPI table.
207 * Note: This function should only be invoked after
208 * acpi_initialize_tables() and before acpi_load_tables().
210 ******************************************************************************/
213 acpi_install_table(acpi_physical_address address, u8 physical)
219 ACPI_FUNCTION_TRACE(acpi_install_table);
222 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
224 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
227 status = acpi_tb_install_standard_table(address, flags,
228 FALSE, FALSE, &table_index);
230 return_ACPI_STATUS(status);
233 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
235 /*******************************************************************************
237 * FUNCTION: acpi_load_table
239 * PARAMETERS: table - Pointer to a buffer containing the ACPI
240 * table to be loaded.
244 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
245 * be a valid ACPI table with a valid ACPI table header.
246 * Note1: Mainly intended to support hotplug addition of SSDTs.
247 * Note2: Does not copy the incoming table. User is responsible
248 * to ensure that the table is not deleted or unmapped.
250 ******************************************************************************/
251 acpi_status acpi_load_table(struct acpi_table_header *table)
256 ACPI_FUNCTION_TRACE(acpi_load_table);
258 /* Parameter validation */
261 return_ACPI_STATUS(AE_BAD_PARAMETER);
264 /* Must acquire the interpreter lock during this operation */
266 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
267 if (ACPI_FAILURE(status)) {
268 return_ACPI_STATUS(status);
271 /* Install the table and load it into the namespace */
273 ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
274 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
276 status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table),
277 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
278 TRUE, FALSE, &table_index);
280 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
281 if (ACPI_FAILURE(status)) {
282 goto unlock_and_exit;
286 * Note: Now table is "INSTALLED", it must be validated before
290 acpi_tb_validate_table(&acpi_gbl_root_table_list.
291 tables[table_index]);
292 if (ACPI_FAILURE(status)) {
293 goto unlock_and_exit;
296 status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
298 /* Invoke table handler if present */
300 if (acpi_gbl_table_handler) {
301 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
302 acpi_gbl_table_handler_context);
306 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
307 return_ACPI_STATUS(status);
310 ACPI_EXPORT_SYMBOL(acpi_load_table)
312 /*******************************************************************************
314 * FUNCTION: acpi_unload_parent_table
316 * PARAMETERS: object - Handle to any namespace object owned by
317 * the table to be unloaded
321 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
322 * the table and deletes all namespace objects associated with
323 * that table. Unloading of the DSDT is not allowed.
324 * Note: Mainly intended to support hotplug removal of SSDTs.
326 ******************************************************************************/
327 acpi_status acpi_unload_parent_table(acpi_handle object)
329 struct acpi_namespace_node *node =
330 ACPI_CAST_PTR(struct acpi_namespace_node, object);
331 acpi_status status = AE_NOT_EXIST;
332 acpi_owner_id owner_id;
335 ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
337 /* Parameter validation */
340 return_ACPI_STATUS(AE_BAD_PARAMETER);
344 * The node owner_id is currently the same as the parent table ID.
345 * However, this could change in the future.
347 owner_id = node->owner_id;
350 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
352 return_ACPI_STATUS(AE_TYPE);
355 /* Must acquire the interpreter lock during this operation */
357 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
358 if (ACPI_FAILURE(status)) {
359 return_ACPI_STATUS(status);
362 /* Find the table in the global table list */
364 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
365 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
370 * Allow unload of SSDT and OEMx tables only. Do not allow unload
371 * of the DSDT. No other types of tables should get here, since
372 * only these types can contain AML and thus are the only types
373 * that can create namespace objects.
375 if (ACPI_COMPARE_NAME
376 (acpi_gbl_root_table_list.tables[i].signature.ascii,
382 /* Ensure the table is actually loaded */
384 if (!acpi_tb_is_table_loaded(i)) {
385 status = AE_NOT_EXIST;
389 /* Invoke table handler if present */
391 if (acpi_gbl_table_handler) {
392 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
393 acpi_gbl_root_table_list.
395 acpi_gbl_table_handler_context);
399 * Delete all namespace objects owned by this table. Note that
400 * these objects can appear anywhere in the namespace by virtue
401 * of the AML "Scope" operator. Thus, we need to track ownership
402 * by an ID, not simply a position within the hierarchy.
404 status = acpi_tb_delete_namespace_by_owner(i);
405 if (ACPI_FAILURE(status)) {
409 status = acpi_tb_release_owner_id(i);
410 acpi_tb_set_table_loaded_flag(i, FALSE);
414 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
415 return_ACPI_STATUS(status);
418 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)