1 /******************************************************************************
3 * Module Name: tbxface - Public interfaces to the ACPI subsystem
4 * ACPI table oriented interfaces
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2006, R. Byron Moore
10 * All rights reserved.
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13 * modification, are permitted provided that the following conditions
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17 * without modification.
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21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
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24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
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45 #include <acpi/acpi.h>
46 #include <acpi/acnamesp.h>
47 #include <acpi/actables.h>
49 #define _COMPONENT ACPI_TABLES
50 ACPI_MODULE_NAME("tbxface")
52 /*******************************************************************************
54 * FUNCTION: acpi_load_tables
60 * DESCRIPTION: This function is called to load the ACPI tables from the
63 ******************************************************************************/
64 acpi_status acpi_load_tables(void)
66 struct acpi_pointer rsdp_address;
69 ACPI_FUNCTION_TRACE(acpi_load_tables);
73 status = acpi_os_get_root_pointer(ACPI_LOGICAL_ADDRESSING,
75 if (ACPI_FAILURE(status)) {
76 ACPI_EXCEPTION((AE_INFO, status, "Could not get the RSDP"));
80 /* Map and validate the RSDP */
82 acpi_gbl_table_flags = rsdp_address.pointer_type;
84 status = acpi_tb_verify_rsdp(&rsdp_address);
85 if (ACPI_FAILURE(status)) {
86 ACPI_EXCEPTION((AE_INFO, status, "During RSDP validation"));
90 /* Get the RSDT via the RSDP */
92 status = acpi_tb_get_table_rsdt();
93 if (ACPI_FAILURE(status)) {
94 ACPI_EXCEPTION((AE_INFO, status, "Could not load RSDT"));
98 /* Now get the tables needed by this subsystem (FADT, DSDT, etc.) */
100 status = acpi_tb_get_required_tables();
101 if (ACPI_FAILURE(status)) {
102 ACPI_EXCEPTION((AE_INFO, status,
103 "Could not get all required tables (DSDT/FADT/FACS)"));
107 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
109 /* Load the namespace from the tables */
111 status = acpi_ns_load_namespace();
112 if (ACPI_FAILURE(status)) {
113 ACPI_EXCEPTION((AE_INFO, status, "Could not load namespace"));
117 return_ACPI_STATUS(AE_OK);
120 ACPI_EXCEPTION((AE_INFO, status, "Could not load tables"));
121 return_ACPI_STATUS(status);
124 ACPI_EXPORT_SYMBOL(acpi_load_tables)
126 #ifdef ACPI_FUTURE_USAGE
127 /*******************************************************************************
129 * FUNCTION: acpi_load_table
131 * PARAMETERS: table_ptr - pointer to a buffer containing the entire
136 * DESCRIPTION: This function is called to load a table from the caller's
137 * buffer. The buffer must contain an entire ACPI Table including
138 * a valid header. The header fields will be verified, and if it
139 * is determined that the table is invalid, the call will fail.
141 ******************************************************************************/
142 acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
145 struct acpi_table_desc table_info;
146 struct acpi_pointer address;
148 ACPI_FUNCTION_TRACE(acpi_load_table);
151 return_ACPI_STATUS(AE_BAD_PARAMETER);
154 /* Copy the table to a local buffer */
156 address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
157 address.pointer.logical = table_ptr;
159 status = acpi_tb_get_table_body(&address, table_ptr, &table_info);
160 if (ACPI_FAILURE(status)) {
161 return_ACPI_STATUS(status);
164 /* Check signature for a valid table type */
166 status = acpi_tb_recognize_table(&table_info, ACPI_TABLE_ALL);
167 if (ACPI_FAILURE(status)) {
168 return_ACPI_STATUS(status);
171 /* Install the new table into the local data structures */
173 status = acpi_tb_install_table(&table_info);
174 if (ACPI_FAILURE(status)) {
175 if (status == AE_ALREADY_EXISTS) {
177 /* Table already exists, no error */
182 /* Free table allocated by acpi_tb_get_table_body */
184 acpi_tb_delete_single_table(&table_info);
185 return_ACPI_STATUS(status);
188 /* Convert the table to common format if necessary */
190 switch (table_info.type) {
191 case ACPI_TABLE_ID_FADT:
193 status = acpi_tb_convert_table_fadt();
196 case ACPI_TABLE_ID_FACS:
198 status = acpi_tb_build_common_facs(&table_info);
202 /* Load table into namespace if it contains executable AML */
205 acpi_ns_load_table(table_info.installed_desc,
210 if (ACPI_FAILURE(status)) {
212 /* Uninstall table and free the buffer */
214 (void)acpi_tb_uninstall_table(table_info.installed_desc);
217 return_ACPI_STATUS(status);
220 ACPI_EXPORT_SYMBOL(acpi_load_table)
222 /*******************************************************************************
224 * FUNCTION: acpi_unload_table
226 * PARAMETERS: table_type - Type of table to be unloaded
230 * DESCRIPTION: This routine is used to force the unload of a table
232 ******************************************************************************/
233 acpi_status acpi_unload_table(acpi_table_type table_type)
235 struct acpi_table_desc *table_desc;
237 ACPI_FUNCTION_TRACE(acpi_unload_table);
239 /* Parameter validation */
241 if (table_type > ACPI_TABLE_ID_MAX) {
242 return_ACPI_STATUS(AE_BAD_PARAMETER);
245 /* Find all tables of the requested type */
247 table_desc = acpi_gbl_table_lists[table_type].next;
250 * Delete all namespace entries owned by this table. Note that these
251 * entries can appear anywhere in the namespace by virtue of the AML
252 * "Scope" operator. Thus, we need to track ownership by an ID, not
253 * simply a position within the hierarchy
255 acpi_ns_delete_namespace_by_owner(table_desc->owner_id);
256 acpi_ut_release_owner_id(&table_desc->owner_id);
257 table_desc = table_desc->next;
260 /* Delete (or unmap) all tables of this type */
262 acpi_tb_delete_tables_by_type(table_type);
263 return_ACPI_STATUS(AE_OK);
266 ACPI_EXPORT_SYMBOL(acpi_unload_table)
268 /*******************************************************************************
270 * FUNCTION: acpi_get_table_header
272 * PARAMETERS: table_type - one of the defined table types
273 * Instance - the non zero instance of the table, allows
274 * support for multiple tables of the same type
275 * see acpi_gbl_acpi_table_flag
276 * out_table_header - pointer to the struct acpi_table_header if successful
278 * DESCRIPTION: This function is called to get an ACPI table header. The caller
279 * supplies an pointer to a data area sufficient to contain an ACPI
280 * struct acpi_table_header structure.
282 * The header contains a length field that can be used to determine
283 * the size of the buffer needed to contain the entire table. This
284 * function is not valid for the RSD PTR table since it does not
285 * have a standard header and is fixed length.
287 ******************************************************************************/
289 acpi_get_table_header(acpi_table_type table_type,
290 u32 instance, struct acpi_table_header *out_table_header)
292 struct acpi_table_header *tbl_ptr;
295 ACPI_FUNCTION_TRACE(acpi_get_table_header);
297 if ((instance == 0) ||
298 (table_type == ACPI_TABLE_ID_RSDP) || (!out_table_header)) {
299 return_ACPI_STATUS(AE_BAD_PARAMETER);
302 /* Check the table type and instance */
304 if ((table_type > ACPI_TABLE_ID_MAX) ||
305 (ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags) &&
307 return_ACPI_STATUS(AE_BAD_PARAMETER);
310 /* Get a pointer to the entire table */
312 status = acpi_tb_get_table_ptr(table_type, instance, &tbl_ptr);
313 if (ACPI_FAILURE(status)) {
314 return_ACPI_STATUS(status);
317 /* The function will return a NULL pointer if the table is not loaded */
319 if (tbl_ptr == NULL) {
320 return_ACPI_STATUS(AE_NOT_EXIST);
323 /* Copy the header to the caller's buffer */
325 ACPI_MEMCPY((void *)out_table_header, (void *)tbl_ptr,
326 sizeof(struct acpi_table_header));
328 return_ACPI_STATUS(status);
331 ACPI_EXPORT_SYMBOL(acpi_get_table_header)
332 #endif /* ACPI_FUTURE_USAGE */
334 /*******************************************************************************
336 * FUNCTION: acpi_get_table
338 * PARAMETERS: table_type - one of the defined table types
339 * Instance - the non zero instance of the table, allows
340 * support for multiple tables of the same type
341 * see acpi_gbl_acpi_table_flag
342 * ret_buffer - pointer to a structure containing a buffer to
347 * DESCRIPTION: This function is called to get an ACPI table. The caller
348 * supplies an out_buffer large enough to contain the entire ACPI
349 * table. The caller should call the acpi_get_table_header function
350 * first to determine the buffer size needed. Upon completion
351 * the out_buffer->Length field will indicate the number of bytes
352 * copied into the out_buffer->buf_ptr buffer. This table will be
353 * a complete table including the header.
355 ******************************************************************************/
357 acpi_get_table(acpi_table_type table_type,
358 u32 instance, struct acpi_buffer *ret_buffer)
360 struct acpi_table_header *tbl_ptr;
362 acpi_size table_length;
364 ACPI_FUNCTION_TRACE(acpi_get_table);
366 /* Parameter validation */
369 return_ACPI_STATUS(AE_BAD_PARAMETER);
372 status = acpi_ut_validate_buffer(ret_buffer);
373 if (ACPI_FAILURE(status)) {
374 return_ACPI_STATUS(status);
377 /* Check the table type and instance */
379 if ((table_type > ACPI_TABLE_ID_MAX) ||
380 (ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags) &&
382 return_ACPI_STATUS(AE_BAD_PARAMETER);
385 /* Get a pointer to the entire table */
387 status = acpi_tb_get_table_ptr(table_type, instance, &tbl_ptr);
388 if (ACPI_FAILURE(status)) {
389 return_ACPI_STATUS(status);
393 * acpi_tb_get_table_ptr will return a NULL pointer if the
394 * table is not loaded.
396 if (tbl_ptr == NULL) {
397 return_ACPI_STATUS(AE_NOT_EXIST);
400 /* Get the table length */
402 if (table_type == ACPI_TABLE_ID_RSDP) {
404 /* RSD PTR is the only "table" without a header */
406 table_length = sizeof(struct rsdp_descriptor);
408 table_length = (acpi_size) tbl_ptr->length;
411 /* Validate/Allocate/Clear caller buffer */
413 status = acpi_ut_initialize_buffer(ret_buffer, table_length);
414 if (ACPI_FAILURE(status)) {
415 return_ACPI_STATUS(status);
418 /* Copy the table to the buffer */
420 ACPI_MEMCPY((void *)ret_buffer->pointer, (void *)tbl_ptr, table_length);
421 return_ACPI_STATUS(AE_OK);
424 ACPI_EXPORT_SYMBOL(acpi_get_table)