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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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
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45 #include <linux/module.h>
47 #include <acpi/acpi.h>
48 #include <acpi/acnamesp.h>
49 #include <acpi/actables.h>
52 #define _COMPONENT ACPI_TABLES
53 ACPI_MODULE_NAME ("tbxface")
56 /*******************************************************************************
58 * FUNCTION: acpi_load_tables
64 * DESCRIPTION: This function is called to load the ACPI tables from the
67 ******************************************************************************/
73 struct acpi_pointer rsdp_address;
77 ACPI_FUNCTION_TRACE ("acpi_load_tables");
82 status = acpi_os_get_root_pointer (ACPI_LOGICAL_ADDRESSING,
84 if (ACPI_FAILURE (status)) {
85 ACPI_REPORT_ERROR (("acpi_load_tables: Could not get RSDP, %s\n",
86 acpi_format_exception (status)));
90 /* Map and validate the RSDP */
92 acpi_gbl_table_flags = rsdp_address.pointer_type;
94 status = acpi_tb_verify_rsdp (&rsdp_address);
95 if (ACPI_FAILURE (status)) {
96 ACPI_REPORT_ERROR (("acpi_load_tables: RSDP Failed validation: %s\n",
97 acpi_format_exception (status)));
101 /* Get the RSDT via the RSDP */
103 status = acpi_tb_get_table_rsdt ();
104 if (ACPI_FAILURE (status)) {
105 ACPI_REPORT_ERROR (("acpi_load_tables: Could not load RSDT: %s\n",
106 acpi_format_exception (status)));
110 /* Now get the tables needed by this subsystem (FADT, DSDT, etc.) */
112 status = acpi_tb_get_required_tables ();
113 if (ACPI_FAILURE (status)) {
115 "acpi_load_tables: Error getting required tables (DSDT/FADT/FACS): %s\n",
116 acpi_format_exception (status)));
120 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
122 /* Load the namespace from the tables */
124 status = acpi_ns_load_namespace ();
125 if (ACPI_FAILURE (status)) {
126 ACPI_REPORT_ERROR (("acpi_load_tables: Could not load namespace: %s\n",
127 acpi_format_exception (status)));
131 return_ACPI_STATUS (AE_OK);
135 ACPI_REPORT_ERROR (("acpi_load_tables: Could not load tables: %s\n",
136 acpi_format_exception (status)));
138 return_ACPI_STATUS (status);
142 #ifdef ACPI_FUTURE_USAGE
143 /*******************************************************************************
145 * FUNCTION: acpi_load_table
147 * PARAMETERS: table_ptr - pointer to a buffer containing the entire
152 * DESCRIPTION: This function is called to load a table from the caller's
153 * buffer. The buffer must contain an entire ACPI Table including
154 * a valid header. The header fields will be verified, and if it
155 * is determined that the table is invalid, the call will fail.
157 ******************************************************************************/
161 struct acpi_table_header *table_ptr)
164 struct acpi_table_desc table_info;
165 struct acpi_pointer address;
168 ACPI_FUNCTION_TRACE ("acpi_load_table");
172 return_ACPI_STATUS (AE_BAD_PARAMETER);
175 /* Copy the table to a local buffer */
177 address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
178 address.pointer.logical = table_ptr;
180 status = acpi_tb_get_table_body (&address, table_ptr, &table_info);
181 if (ACPI_FAILURE (status)) {
182 return_ACPI_STATUS (status);
185 /* Check signature for a valid table type */
187 status = acpi_tb_recognize_table (&table_info, ACPI_TABLE_ALL);
188 if (ACPI_FAILURE (status)) {
189 return_ACPI_STATUS (status);
192 /* Install the new table into the local data structures */
194 status = acpi_tb_install_table (&table_info);
195 if (ACPI_FAILURE (status)) {
196 if (status == AE_ALREADY_EXISTS) {
197 /* Table already exists, no error */
202 /* Free table allocated by acpi_tb_get_table_body */
204 acpi_tb_delete_single_table (&table_info);
205 return_ACPI_STATUS (status);
208 /* Convert the table to common format if necessary */
210 switch (table_info.type) {
211 case ACPI_TABLE_FADT:
213 status = acpi_tb_convert_table_fadt ();
216 case ACPI_TABLE_FACS:
218 status = acpi_tb_build_common_facs (&table_info);
222 /* Load table into namespace if it contains executable AML */
224 status = acpi_ns_load_table (table_info.installed_desc, acpi_gbl_root_node);
228 if (ACPI_FAILURE (status)) {
229 /* Uninstall table and free the buffer */
231 (void) acpi_tb_uninstall_table (table_info.installed_desc);
234 return_ACPI_STATUS (status);
238 /*******************************************************************************
240 * FUNCTION: acpi_unload_table
242 * PARAMETERS: table_type - Type of table to be unloaded
246 * DESCRIPTION: This routine is used to force the unload of a table
248 ******************************************************************************/
252 acpi_table_type table_type)
254 struct acpi_table_desc *table_desc;
257 ACPI_FUNCTION_TRACE ("acpi_unload_table");
260 /* Parameter validation */
262 if (table_type > ACPI_TABLE_MAX) {
263 return_ACPI_STATUS (AE_BAD_PARAMETER);
266 /* Find all tables of the requested type */
268 table_desc = acpi_gbl_table_lists[table_type].next;
271 * Delete all namespace entries owned by this table. Note that these
272 * entries can appear anywhere in the namespace by virtue of the AML
273 * "Scope" operator. Thus, we need to track ownership by an ID, not
274 * simply a position within the hierarchy
276 acpi_ns_delete_namespace_by_owner (table_desc->owner_id);
277 acpi_ut_release_owner_id (&table_desc->owner_id);
278 table_desc = table_desc->next;
281 /* Delete (or unmap) all tables of this type */
283 acpi_tb_delete_tables_by_type (table_type);
284 return_ACPI_STATUS (AE_OK);
288 /*******************************************************************************
290 * FUNCTION: acpi_get_table_header
292 * PARAMETERS: table_type - one of the defined table types
293 * Instance - the non zero instance of the table, allows
294 * support for multiple tables of the same type
295 * see acpi_gbl_acpi_table_flag
296 * out_table_header - pointer to the struct acpi_table_header if successful
298 * DESCRIPTION: This function is called to get an ACPI table header. The caller
299 * supplies an pointer to a data area sufficient to contain an ACPI
300 * struct acpi_table_header structure.
302 * The header contains a length field that can be used to determine
303 * the size of the buffer needed to contain the entire table. This
304 * function is not valid for the RSD PTR table since it does not
305 * have a standard header and is fixed length.
307 ******************************************************************************/
310 acpi_get_table_header (
311 acpi_table_type table_type,
313 struct acpi_table_header *out_table_header)
315 struct acpi_table_header *tbl_ptr;
319 ACPI_FUNCTION_TRACE ("acpi_get_table_header");
322 if ((instance == 0) ||
323 (table_type == ACPI_TABLE_RSDP) ||
324 (!out_table_header)) {
325 return_ACPI_STATUS (AE_BAD_PARAMETER);
328 /* Check the table type and instance */
330 if ((table_type > ACPI_TABLE_MAX) ||
331 (ACPI_IS_SINGLE_TABLE (acpi_gbl_table_data[table_type].flags) &&
333 return_ACPI_STATUS (AE_BAD_PARAMETER);
336 /* Get a pointer to the entire table */
338 status = acpi_tb_get_table_ptr (table_type, instance, &tbl_ptr);
339 if (ACPI_FAILURE (status)) {
340 return_ACPI_STATUS (status);
343 /* The function will return a NULL pointer if the table is not loaded */
345 if (tbl_ptr == NULL) {
346 return_ACPI_STATUS (AE_NOT_EXIST);
349 /* Copy the header to the caller's buffer */
351 ACPI_MEMCPY ((void *) out_table_header, (void *) tbl_ptr,
352 sizeof (struct acpi_table_header));
354 return_ACPI_STATUS (status);
357 #endif /* ACPI_FUTURE_USAGE */
359 /*******************************************************************************
361 * FUNCTION: acpi_get_table
363 * PARAMETERS: table_type - one of the defined table types
364 * Instance - the non zero instance of the table, allows
365 * support for multiple tables of the same type
366 * see acpi_gbl_acpi_table_flag
367 * ret_buffer - pointer to a structure containing a buffer to
372 * DESCRIPTION: This function is called to get an ACPI table. The caller
373 * supplies an out_buffer large enough to contain the entire ACPI
374 * table. The caller should call the acpi_get_table_header function
375 * first to determine the buffer size needed. Upon completion
376 * the out_buffer->Length field will indicate the number of bytes
377 * copied into the out_buffer->buf_ptr buffer. This table will be
378 * a complete table including the header.
380 ******************************************************************************/
384 acpi_table_type table_type,
386 struct acpi_buffer *ret_buffer)
388 struct acpi_table_header *tbl_ptr;
390 acpi_size table_length;
393 ACPI_FUNCTION_TRACE ("acpi_get_table");
396 /* Parameter validation */
399 return_ACPI_STATUS (AE_BAD_PARAMETER);
402 status = acpi_ut_validate_buffer (ret_buffer);
403 if (ACPI_FAILURE (status)) {
404 return_ACPI_STATUS (status);
407 /* Check the table type and instance */
409 if ((table_type > ACPI_TABLE_MAX) ||
410 (ACPI_IS_SINGLE_TABLE (acpi_gbl_table_data[table_type].flags) &&
412 return_ACPI_STATUS (AE_BAD_PARAMETER);
415 /* Get a pointer to the entire table */
417 status = acpi_tb_get_table_ptr (table_type, instance, &tbl_ptr);
418 if (ACPI_FAILURE (status)) {
419 return_ACPI_STATUS (status);
423 * acpi_tb_get_table_ptr will return a NULL pointer if the
424 * table is not loaded.
426 if (tbl_ptr == NULL) {
427 return_ACPI_STATUS (AE_NOT_EXIST);
430 /* Get the table length */
432 if (table_type == ACPI_TABLE_RSDP) {
433 /* RSD PTR is the only "table" without a header */
435 table_length = sizeof (struct rsdp_descriptor);
438 table_length = (acpi_size) tbl_ptr->length;
441 /* Validate/Allocate/Clear caller buffer */
443 status = acpi_ut_initialize_buffer (ret_buffer, table_length);
444 if (ACPI_FAILURE (status)) {
445 return_ACPI_STATUS (status);
448 /* Copy the table to the buffer */
450 ACPI_MEMCPY ((void *) ret_buffer->pointer, (void *) tbl_ptr, table_length);
451 return_ACPI_STATUS (AE_OK);
453 EXPORT_SYMBOL(acpi_get_table);