1 /******************************************************************************
3 * Module Name: tbget - ACPI Table get* routines
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2005, R. Byron Moore
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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15 * notice, this list of conditions, and the following disclaimer,
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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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45 #include <acpi/acpi.h>
46 #include <acpi/actables.h>
49 #define _COMPONENT ACPI_TABLES
50 ACPI_MODULE_NAME ("tbget")
52 /* Local prototypes */
55 acpi_tb_get_this_table (
56 struct acpi_pointer *address,
57 struct acpi_table_header *header,
58 struct acpi_table_desc *table_info);
61 acpi_tb_table_override (
62 struct acpi_table_header *header,
63 struct acpi_table_desc *table_info);
66 /*******************************************************************************
68 * FUNCTION: acpi_tb_get_table
70 * PARAMETERS: Address - Address of table to retrieve. Can be
72 * table_info - Where table info is returned
76 * DESCRIPTION: Get entire table of unknown size.
78 ******************************************************************************/
82 struct acpi_pointer *address,
83 struct acpi_table_desc *table_info)
86 struct acpi_table_header header;
89 ACPI_FUNCTION_TRACE ("tb_get_table");
92 /* Get the header in order to get signature and table size */
94 status = acpi_tb_get_table_header (address, &header);
95 if (ACPI_FAILURE (status)) {
96 return_ACPI_STATUS (status);
99 /* Get the entire table */
101 status = acpi_tb_get_table_body (address, &header, table_info);
102 if (ACPI_FAILURE (status)) {
103 ACPI_REPORT_ERROR (("Could not get ACPI table (size %X), %s\n",
104 header.length, acpi_format_exception (status)));
105 return_ACPI_STATUS (status);
108 return_ACPI_STATUS (AE_OK);
112 /*******************************************************************************
114 * FUNCTION: acpi_tb_get_table_header
116 * PARAMETERS: Address - Address of table to retrieve. Can be
117 * Logical or Physical
118 * return_header - Where the table header is returned
122 * DESCRIPTION: Get an ACPI table header. Works in both physical or virtual
123 * addressing mode. Works with both physical or logical pointers.
124 * Table is either copied or mapped, depending on the pointer
125 * type and mode of the processor.
127 ******************************************************************************/
130 acpi_tb_get_table_header (
131 struct acpi_pointer *address,
132 struct acpi_table_header *return_header)
134 acpi_status status = AE_OK;
135 struct acpi_table_header *header = NULL;
138 ACPI_FUNCTION_TRACE ("tb_get_table_header");
142 * Flags contains the current processor mode (Virtual or Physical
143 * addressing) The pointer_type is either Logical or Physical
145 switch (address->pointer_type) {
146 case ACPI_PHYSMODE_PHYSPTR:
147 case ACPI_LOGMODE_LOGPTR:
149 /* Pointer matches processor mode, copy the header */
151 ACPI_MEMCPY (return_header, address->pointer.logical,
152 sizeof (struct acpi_table_header));
156 case ACPI_LOGMODE_PHYSPTR:
158 /* Create a logical address for the physical pointer*/
160 status = acpi_os_map_memory (address->pointer.physical,
161 sizeof (struct acpi_table_header), (void *) &header);
162 if (ACPI_FAILURE (status)) {
164 "Could not map memory at %8.8X%8.8X for length %X\n",
165 ACPI_FORMAT_UINT64 (address->pointer.physical),
166 sizeof (struct acpi_table_header)));
167 return_ACPI_STATUS (status);
170 /* Copy header and delete mapping */
172 ACPI_MEMCPY (return_header, header, sizeof (struct acpi_table_header));
173 acpi_os_unmap_memory (header, sizeof (struct acpi_table_header));
179 ACPI_REPORT_ERROR (("Invalid address flags %X\n",
180 address->pointer_type));
181 return_ACPI_STATUS (AE_BAD_PARAMETER);
184 ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Table Signature: [%4.4s]\n",
185 return_header->signature));
187 return_ACPI_STATUS (AE_OK);
191 /*******************************************************************************
193 * FUNCTION: acpi_tb_get_table_body
195 * PARAMETERS: Address - Address of table to retrieve. Can be
196 * Logical or Physical
197 * Header - Header of the table to retrieve
198 * table_info - Where the table info is returned
202 * DESCRIPTION: Get an entire ACPI table with support to allow the host OS to
203 * replace the table with a newer version (table override.)
204 * Works in both physical or virtual
205 * addressing mode. Works with both physical or logical pointers.
206 * Table is either copied or mapped, depending on the pointer
207 * type and mode of the processor.
209 ******************************************************************************/
212 acpi_tb_get_table_body (
213 struct acpi_pointer *address,
214 struct acpi_table_header *header,
215 struct acpi_table_desc *table_info)
220 ACPI_FUNCTION_TRACE ("tb_get_table_body");
223 if (!table_info || !address) {
224 return_ACPI_STATUS (AE_BAD_PARAMETER);
227 /* Attempt table override. */
229 status = acpi_tb_table_override (header, table_info);
230 if (ACPI_SUCCESS (status)) {
231 /* Table was overridden by the host OS */
233 return_ACPI_STATUS (status);
236 /* No override, get the original table */
238 status = acpi_tb_get_this_table (address, header, table_info);
239 return_ACPI_STATUS (status);
243 /*******************************************************************************
245 * FUNCTION: acpi_tb_table_override
247 * PARAMETERS: Header - Pointer to table header
248 * table_info - Return info if table is overridden
252 * DESCRIPTION: Attempts override of current table with a new one if provided
255 ******************************************************************************/
258 acpi_tb_table_override (
259 struct acpi_table_header *header,
260 struct acpi_table_desc *table_info)
262 struct acpi_table_header *new_table;
264 struct acpi_pointer address;
267 ACPI_FUNCTION_TRACE ("tb_table_override");
271 * The OSL will examine the header and decide whether to override this
272 * table. If it decides to override, a table will be returned in new_table,
273 * which we will then copy.
275 status = acpi_os_table_override (header, &new_table);
276 if (ACPI_FAILURE (status)) {
277 /* Some severe error from the OSL, but we basically ignore it */
279 ACPI_REPORT_ERROR (("Could not override ACPI table, %s\n",
280 acpi_format_exception (status)));
281 return_ACPI_STATUS (status);
285 /* No table override */
287 return_ACPI_STATUS (AE_NO_ACPI_TABLES);
291 * We have a new table to override the old one. Get a copy of
292 * the new one. We know that the new table has a logical pointer.
294 address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
295 address.pointer.logical = new_table;
297 status = acpi_tb_get_this_table (&address, new_table, table_info);
298 if (ACPI_FAILURE (status)) {
299 ACPI_REPORT_ERROR (("Could not copy override ACPI table, %s\n",
300 acpi_format_exception (status)));
301 return_ACPI_STATUS (status);
304 /* Copy the table info */
306 ACPI_REPORT_INFO (("Table [%4.4s] replaced by host OS\n",
307 table_info->pointer->signature));
309 return_ACPI_STATUS (AE_OK);
313 /*******************************************************************************
315 * FUNCTION: acpi_tb_get_this_table
317 * PARAMETERS: Address - Address of table to retrieve. Can be
318 * Logical or Physical
319 * Header - Header of the table to retrieve
320 * table_info - Where the table info is returned
324 * DESCRIPTION: Get an entire ACPI table. Works in both physical or virtual
325 * addressing mode. Works with both physical or logical pointers.
326 * Table is either copied or mapped, depending on the pointer
327 * type and mode of the processor.
329 ******************************************************************************/
332 acpi_tb_get_this_table (
333 struct acpi_pointer *address,
334 struct acpi_table_header *header,
335 struct acpi_table_desc *table_info)
337 struct acpi_table_header *full_table = NULL;
339 acpi_status status = AE_OK;
342 ACPI_FUNCTION_TRACE ("tb_get_this_table");
346 * Flags contains the current processor mode (Virtual or Physical
347 * addressing) The pointer_type is either Logical or Physical
349 switch (address->pointer_type) {
350 case ACPI_PHYSMODE_PHYSPTR:
351 case ACPI_LOGMODE_LOGPTR:
353 /* Pointer matches processor mode, copy the table to a new buffer */
355 full_table = ACPI_MEM_ALLOCATE (header->length);
358 "Could not allocate table memory for [%4.4s] length %X\n",
359 header->signature, header->length));
360 return_ACPI_STATUS (AE_NO_MEMORY);
363 /* Copy the entire table (including header) to the local buffer */
365 ACPI_MEMCPY (full_table, address->pointer.logical, header->length);
367 /* Save allocation type */
369 allocation = ACPI_MEM_ALLOCATED;
373 case ACPI_LOGMODE_PHYSPTR:
376 * Just map the table's physical memory
377 * into our address space.
379 status = acpi_os_map_memory (address->pointer.physical,
380 (acpi_size) header->length, (void *) &full_table);
381 if (ACPI_FAILURE (status)) {
383 "Could not map memory for table [%4.4s] at %8.8X%8.8X for length %X\n",
385 ACPI_FORMAT_UINT64 (address->pointer.physical),
390 /* Save allocation type */
392 allocation = ACPI_MEM_MAPPED;
398 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid address flags %X\n",
399 address->pointer_type));
400 return_ACPI_STATUS (AE_BAD_PARAMETER);
404 * Validate checksum for _most_ tables,
405 * even the ones whose signature we don't recognize
407 if (table_info->type != ACPI_TABLE_FACS) {
408 status = acpi_tb_verify_table_checksum (full_table);
410 #if (!ACPI_CHECKSUM_ABORT)
411 if (ACPI_FAILURE (status)) {
412 /* Ignore the error if configuration says so */
421 table_info->pointer = full_table;
422 table_info->length = (acpi_size) header->length;
423 table_info->allocation = allocation;
425 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
426 "Found table [%4.4s] at %8.8X%8.8X, mapped/copied to %p\n",
427 full_table->signature,
428 ACPI_FORMAT_UINT64 (address->pointer.physical), full_table));
430 return_ACPI_STATUS (status);
434 /*******************************************************************************
436 * FUNCTION: acpi_tb_get_table_ptr
438 * PARAMETERS: table_type - one of the defined table types
439 * Instance - Which table of this type
440 * table_ptr_loc - pointer to location to place the pointer for
445 * DESCRIPTION: This function is called to get the pointer to an ACPI table.
447 ******************************************************************************/
450 acpi_tb_get_table_ptr (
451 acpi_table_type table_type,
453 struct acpi_table_header **table_ptr_loc)
455 struct acpi_table_desc *table_desc;
459 ACPI_FUNCTION_TRACE ("tb_get_table_ptr");
462 if (!acpi_gbl_DSDT) {
463 return_ACPI_STATUS (AE_NO_ACPI_TABLES);
466 if (table_type > ACPI_TABLE_MAX) {
467 return_ACPI_STATUS (AE_BAD_PARAMETER);
471 * For all table types (Single/Multiple), the first
472 * instance is always in the list head.
477 *table_ptr_loc = NULL;
478 if (acpi_gbl_table_lists[table_type].next) {
479 *table_ptr_loc = acpi_gbl_table_lists[table_type].next->pointer;
481 return_ACPI_STATUS (AE_OK);
484 /* Check for instance out of range */
486 if (instance > acpi_gbl_table_lists[table_type].count) {
487 return_ACPI_STATUS (AE_NOT_EXIST);
490 /* Walk the list to get the desired table
491 * Since the if (Instance == 1) check above checked for the
492 * first table, setting table_desc equal to the .Next member
493 * is actually pointing to the second table. Therefore, we
494 * need to walk from the 2nd table until we reach the Instance
495 * that the user is looking for and return its table pointer.
497 table_desc = acpi_gbl_table_lists[table_type].next;
498 for (i = 2; i < instance; i++) {
499 table_desc = table_desc->next;
502 /* We are now pointing to the requested table's descriptor */
504 *table_ptr_loc = table_desc->pointer;
506 return_ACPI_STATUS (AE_OK);