1 /******************************************************************************
3 * Module Name: tbxface - Public interfaces to the ACPI subsystem
4 * ACPI table oriented interfaces
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2005, R. Byron Moore
10 * All rights reserved.
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13 * modification, are permitted provided that the following conditions
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21 * including a substantially similar Disclaimer requirement for further
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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
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45 #include <linux/module.h>
47 #include <acpi/acpi.h>
48 #include <acpi/acnamesp.h>
49 #include <acpi/actables.h>
51 #define _COMPONENT ACPI_TABLES
52 ACPI_MODULE_NAME("tbxface")
54 /*******************************************************************************
56 * FUNCTION: acpi_load_tables
62 * DESCRIPTION: This function is called to load the ACPI tables from the
65 ******************************************************************************/
66 acpi_status acpi_load_tables(void)
68 struct acpi_pointer rsdp_address;
71 ACPI_FUNCTION_TRACE("acpi_load_tables");
75 status = acpi_os_get_root_pointer(ACPI_LOGICAL_ADDRESSING,
77 if (ACPI_FAILURE(status)) {
78 ACPI_REPORT_ERROR(("acpi_load_tables: Could not get RSDP, %s\n",
79 acpi_format_exception(status)));
83 /* Map and validate the RSDP */
85 acpi_gbl_table_flags = rsdp_address.pointer_type;
87 status = acpi_tb_verify_rsdp(&rsdp_address);
88 if (ACPI_FAILURE(status)) {
89 ACPI_REPORT_ERROR(("acpi_load_tables: RSDP Failed validation: %s\n", acpi_format_exception(status)));
93 /* Get the RSDT via the RSDP */
95 status = acpi_tb_get_table_rsdt();
96 if (ACPI_FAILURE(status)) {
97 ACPI_REPORT_ERROR(("acpi_load_tables: Could not load RSDT: %s\n", acpi_format_exception(status)));
101 /* Now get the tables needed by this subsystem (FADT, DSDT, etc.) */
103 status = acpi_tb_get_required_tables();
104 if (ACPI_FAILURE(status)) {
105 ACPI_REPORT_ERROR(("acpi_load_tables: Error getting required tables (DSDT/FADT/FACS): %s\n", acpi_format_exception(status)));
109 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
111 /* Load the namespace from the tables */
113 status = acpi_ns_load_namespace();
114 if (ACPI_FAILURE(status)) {
115 ACPI_REPORT_ERROR(("acpi_load_tables: Could not load namespace: %s\n", acpi_format_exception(status)));
119 return_ACPI_STATUS(AE_OK);
122 ACPI_REPORT_ERROR(("acpi_load_tables: Could not load tables: %s\n",
123 acpi_format_exception(status)));
125 return_ACPI_STATUS(status);
128 #ifdef ACPI_FUTURE_USAGE
129 /*******************************************************************************
131 * FUNCTION: acpi_load_table
133 * PARAMETERS: table_ptr - pointer to a buffer containing the entire
138 * DESCRIPTION: This function is called to load a table from the caller's
139 * buffer. The buffer must contain an entire ACPI Table including
140 * a valid header. The header fields will be verified, and if it
141 * is determined that the table is invalid, the call will fail.
143 ******************************************************************************/
145 acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
148 struct acpi_table_desc table_info;
149 struct acpi_pointer address;
151 ACPI_FUNCTION_TRACE("acpi_load_table");
154 return_ACPI_STATUS(AE_BAD_PARAMETER);
157 /* Copy the table to a local buffer */
159 address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
160 address.pointer.logical = table_ptr;
162 status = acpi_tb_get_table_body(&address, table_ptr, &table_info);
163 if (ACPI_FAILURE(status)) {
164 return_ACPI_STATUS(status);
167 /* Check signature for a valid table type */
169 status = acpi_tb_recognize_table(&table_info, ACPI_TABLE_ALL);
170 if (ACPI_FAILURE(status)) {
171 return_ACPI_STATUS(status);
174 /* Install the new table into the local data structures */
176 status = acpi_tb_install_table(&table_info);
177 if (ACPI_FAILURE(status)) {
178 if (status == AE_ALREADY_EXISTS) {
179 /* Table already exists, no error */
184 /* Free table allocated by acpi_tb_get_table_body */
186 acpi_tb_delete_single_table(&table_info);
187 return_ACPI_STATUS(status);
190 /* Convert the table to common format if necessary */
192 switch (table_info.type) {
193 case ACPI_TABLE_FADT:
195 status = acpi_tb_convert_table_fadt();
198 case ACPI_TABLE_FACS:
200 status = acpi_tb_build_common_facs(&table_info);
204 /* Load table into namespace if it contains executable AML */
207 acpi_ns_load_table(table_info.installed_desc,
212 if (ACPI_FAILURE(status)) {
213 /* Uninstall table and free the buffer */
215 (void)acpi_tb_uninstall_table(table_info.installed_desc);
218 return_ACPI_STATUS(status);
221 /*******************************************************************************
223 * FUNCTION: acpi_unload_table
225 * PARAMETERS: table_type - Type of table to be unloaded
229 * DESCRIPTION: This routine is used to force the unload of a table
231 ******************************************************************************/
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_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 /*******************************************************************************
268 * FUNCTION: acpi_get_table_header
270 * PARAMETERS: table_type - one of the defined table types
271 * Instance - the non zero instance of the table, allows
272 * support for multiple tables of the same type
273 * see acpi_gbl_acpi_table_flag
274 * out_table_header - pointer to the struct acpi_table_header if successful
276 * DESCRIPTION: This function is called to get an ACPI table header. The caller
277 * supplies an pointer to a data area sufficient to contain an ACPI
278 * struct acpi_table_header structure.
280 * The header contains a length field that can be used to determine
281 * the size of the buffer needed to contain the entire table. This
282 * function is not valid for the RSD PTR table since it does not
283 * have a standard header and is fixed length.
285 ******************************************************************************/
288 acpi_get_table_header(acpi_table_type table_type,
289 u32 instance, struct acpi_table_header *out_table_header)
291 struct acpi_table_header *tbl_ptr;
294 ACPI_FUNCTION_TRACE("acpi_get_table_header");
296 if ((instance == 0) ||
297 (table_type == ACPI_TABLE_RSDP) || (!out_table_header)) {
298 return_ACPI_STATUS(AE_BAD_PARAMETER);
301 /* Check the table type and instance */
303 if ((table_type > ACPI_TABLE_MAX) ||
304 (ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags) &&
306 return_ACPI_STATUS(AE_BAD_PARAMETER);
309 /* Get a pointer to the entire table */
311 status = acpi_tb_get_table_ptr(table_type, instance, &tbl_ptr);
312 if (ACPI_FAILURE(status)) {
313 return_ACPI_STATUS(status);
316 /* The function will return a NULL pointer if the table is not loaded */
318 if (tbl_ptr == NULL) {
319 return_ACPI_STATUS(AE_NOT_EXIST);
322 /* Copy the header to the caller's buffer */
324 ACPI_MEMCPY((void *)out_table_header, (void *)tbl_ptr,
325 sizeof(struct acpi_table_header));
327 return_ACPI_STATUS(status);
330 #endif /* ACPI_FUTURE_USAGE */
332 /*******************************************************************************
334 * FUNCTION: acpi_get_table
336 * PARAMETERS: table_type - one of the defined table types
337 * Instance - the non zero instance of the table, allows
338 * support for multiple tables of the same type
339 * see acpi_gbl_acpi_table_flag
340 * ret_buffer - pointer to a structure containing a buffer to
345 * DESCRIPTION: This function is called to get an ACPI table. The caller
346 * supplies an out_buffer large enough to contain the entire ACPI
347 * table. The caller should call the acpi_get_table_header function
348 * first to determine the buffer size needed. Upon completion
349 * the out_buffer->Length field will indicate the number of bytes
350 * copied into the out_buffer->buf_ptr buffer. This table will be
351 * a complete table including the header.
353 ******************************************************************************/
356 acpi_get_table(acpi_table_type table_type,
357 u32 instance, struct acpi_buffer *ret_buffer)
359 struct acpi_table_header *tbl_ptr;
361 acpi_size table_length;
363 ACPI_FUNCTION_TRACE("acpi_get_table");
365 /* Parameter validation */
368 return_ACPI_STATUS(AE_BAD_PARAMETER);
371 status = acpi_ut_validate_buffer(ret_buffer);
372 if (ACPI_FAILURE(status)) {
373 return_ACPI_STATUS(status);
376 /* Check the table type and instance */
378 if ((table_type > ACPI_TABLE_MAX) ||
379 (ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags) &&
381 return_ACPI_STATUS(AE_BAD_PARAMETER);
384 /* Get a pointer to the entire table */
386 status = acpi_tb_get_table_ptr(table_type, instance, &tbl_ptr);
387 if (ACPI_FAILURE(status)) {
388 return_ACPI_STATUS(status);
392 * acpi_tb_get_table_ptr will return a NULL pointer if the
393 * table is not loaded.
395 if (tbl_ptr == NULL) {
396 return_ACPI_STATUS(AE_NOT_EXIST);
399 /* Get the table length */
401 if (table_type == ACPI_TABLE_RSDP) {
402 /* RSD PTR is the only "table" without a header */
404 table_length = sizeof(struct rsdp_descriptor);
406 table_length = (acpi_size) tbl_ptr->length;
409 /* Validate/Allocate/Clear caller buffer */
411 status = acpi_ut_initialize_buffer(ret_buffer, table_length);
412 if (ACPI_FAILURE(status)) {
413 return_ACPI_STATUS(status);
416 /* Copy the table to the buffer */
418 ACPI_MEMCPY((void *)ret_buffer->pointer, (void *)tbl_ptr, table_length);
419 return_ACPI_STATUS(AE_OK);
422 EXPORT_SYMBOL(acpi_get_table);