1 /******************************************************************************
3 * Module Name: tbinstal - ACPI table installation and removal
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
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
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18 * substantially similar to the "NO WARRANTY" disclaimer below
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20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
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
28 * Software Foundation.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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45 #include <acpi/acpi.h>
46 #include <acpi/actables.h>
49 #define _COMPONENT ACPI_TABLES
50 ACPI_MODULE_NAME ("tbinstal")
52 /* Local prototypes */
55 acpi_tb_match_signature (
57 struct acpi_table_desc *table_info,
61 /*******************************************************************************
63 * FUNCTION: acpi_tb_match_signature
65 * PARAMETERS: Signature - Table signature to match
66 * table_info - Return data
67 * search_type - Table type to match (primary/secondary)
71 * DESCRIPTION: Compare signature against the list of "ACPI-subsystem-owned"
72 * tables (DSDT/FADT/SSDT, etc.) Returns the table_type_iD on match.
74 ******************************************************************************/
77 acpi_tb_match_signature (
79 struct acpi_table_desc *table_info,
85 ACPI_FUNCTION_TRACE ("tb_match_signature");
88 /* Search for a signature match among the known table types */
90 for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {
91 if (!(acpi_gbl_table_data[i].flags & search_type)) {
95 if (!ACPI_STRNCMP (signature, acpi_gbl_table_data[i].signature,
96 acpi_gbl_table_data[i].sig_length)) {
97 /* Found a signature match, return index if requested */
100 table_info->type = (u8) i;
103 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
104 "Table [%4.4s] is an ACPI table consumed by the core subsystem\n",
105 (char *) acpi_gbl_table_data[i].signature));
107 return_ACPI_STATUS (AE_OK);
111 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
112 "Table [%4.4s] is not an ACPI table consumed by the core subsystem - ignored\n",
113 (char *) signature));
115 return_ACPI_STATUS (AE_TABLE_NOT_SUPPORTED);
119 /*******************************************************************************
121 * FUNCTION: acpi_tb_install_table
123 * PARAMETERS: table_info - Return value from acpi_tb_get_table_body
127 * DESCRIPTION: Load and validate all tables other than the RSDT. The RSDT must
128 * already be loaded and validated.
129 * Install the table into the global data structs.
131 ******************************************************************************/
134 acpi_tb_install_table (
135 struct acpi_table_desc *table_info)
139 ACPI_FUNCTION_TRACE ("tb_install_table");
142 /* Lock tables while installing */
144 status = acpi_ut_acquire_mutex (ACPI_MTX_TABLES);
145 if (ACPI_FAILURE (status)) {
146 ACPI_REPORT_ERROR (("Could not acquire table mutex for [%4.4s], %s\n",
147 table_info->pointer->signature, acpi_format_exception (status)));
148 return_ACPI_STATUS (status);
151 /* Install the table into the global data structure */
153 status = acpi_tb_init_table_descriptor (table_info->type, table_info);
154 if (ACPI_FAILURE (status)) {
155 ACPI_REPORT_ERROR (("Could not install ACPI table [%4.4s], %s\n",
156 table_info->pointer->signature, acpi_format_exception (status)));
159 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "%s located at %p\n",
160 acpi_gbl_table_data[table_info->type].name, table_info->pointer));
162 (void) acpi_ut_release_mutex (ACPI_MTX_TABLES);
163 return_ACPI_STATUS (status);
167 /*******************************************************************************
169 * FUNCTION: acpi_tb_recognize_table
171 * PARAMETERS: table_info - Return value from acpi_tb_get_table_body
172 * search_type - Table type to match (primary/secondary)
176 * DESCRIPTION: Check a table signature for a match against known table types
178 * NOTE: All table pointers are validated as follows:
179 * 1) Table pointer must point to valid physical memory
180 * 2) Signature must be 4 ASCII chars, even if we don't recognize the
182 * 3) Table must be readable for length specified in the header
183 * 4) Table checksum must be valid (with the exception of the FACS
184 * which has no checksum for some odd reason)
186 ******************************************************************************/
189 acpi_tb_recognize_table (
190 struct acpi_table_desc *table_info,
193 struct acpi_table_header *table_header;
197 ACPI_FUNCTION_TRACE ("tb_recognize_table");
200 /* Ensure that we have a valid table pointer */
202 table_header = (struct acpi_table_header *) table_info->pointer;
204 return_ACPI_STATUS (AE_BAD_PARAMETER);
208 * We only "recognize" a limited number of ACPI tables -- namely, the
209 * ones that are used by the subsystem (DSDT, FADT, etc.)
211 * An AE_TABLE_NOT_SUPPORTED means that the table was not recognized.
212 * This can be any one of many valid ACPI tables, it just isn't one of
213 * the tables that is consumed by the core subsystem
215 status = acpi_tb_match_signature (table_header->signature,
216 table_info, search_type);
217 if (ACPI_FAILURE (status)) {
218 return_ACPI_STATUS (status);
221 status = acpi_tb_validate_table_header (table_header);
222 if (ACPI_FAILURE (status)) {
223 return_ACPI_STATUS (status);
226 /* Return the table type and length via the info struct */
228 table_info->length = (acpi_size) table_header->length;
230 return_ACPI_STATUS (status);
234 /*******************************************************************************
236 * FUNCTION: acpi_tb_init_table_descriptor
238 * PARAMETERS: table_type - The type of the table
239 * table_info - A table info struct
243 * DESCRIPTION: Install a table into the global data structs.
245 ******************************************************************************/
248 acpi_tb_init_table_descriptor (
249 acpi_table_type table_type,
250 struct acpi_table_desc *table_info)
252 struct acpi_table_list *list_head;
253 struct acpi_table_desc *table_desc;
257 ACPI_FUNCTION_TRACE_U32 ("tb_init_table_descriptor", table_type);
260 /* Allocate a descriptor for this table */
262 table_desc = ACPI_MEM_CALLOCATE (sizeof (struct acpi_table_desc));
264 return_ACPI_STATUS (AE_NO_MEMORY);
267 /* Get a new owner ID for the table */
269 status = acpi_ut_allocate_owner_id (&table_desc->owner_id);
270 if (ACPI_FAILURE (status)) {
271 return_ACPI_STATUS (status);
274 /* Install the table into the global data structure */
276 list_head = &acpi_gbl_table_lists[table_type];
279 * Two major types of tables: 1) Only one instance is allowed. This
280 * includes most ACPI tables such as the DSDT. 2) Multiple instances of
281 * the table are allowed. This includes SSDT and PSDTs.
283 if (ACPI_IS_SINGLE_TABLE (acpi_gbl_table_data[table_type].flags)) {
285 * Only one table allowed, and a table has alread been installed
286 * at this location, so return an error.
288 if (list_head->next) {
289 ACPI_MEM_FREE (table_desc);
290 return_ACPI_STATUS (AE_ALREADY_EXISTS);
293 table_desc->next = list_head->next;
294 list_head->next = table_desc;
296 if (table_desc->next) {
297 table_desc->next->prev = table_desc;
304 * Link the new table in to the list of tables of this type.
305 * Insert at the end of the list, order IS IMPORTANT.
307 * table_desc->Prev & Next are already NULL from calloc()
311 if (!list_head->next) {
312 list_head->next = table_desc;
315 table_desc->next = list_head->next;
317 while (table_desc->next->next) {
318 table_desc->next = table_desc->next->next;
321 table_desc->next->next = table_desc;
322 table_desc->prev = table_desc->next;
323 table_desc->next = NULL;
327 /* Finish initialization of the table descriptor */
329 table_desc->type = (u8) table_type;
330 table_desc->pointer = table_info->pointer;
331 table_desc->length = table_info->length;
332 table_desc->allocation = table_info->allocation;
333 table_desc->aml_start = (u8 *) (table_desc->pointer + 1),
334 table_desc->aml_length = (u32) (table_desc->length -
335 (u32) sizeof (struct acpi_table_header));
336 table_desc->loaded_into_namespace = FALSE;
339 * Set the appropriate global pointer (if there is one) to point to the
340 * newly installed table
342 if (acpi_gbl_table_data[table_type].global_ptr) {
343 *(acpi_gbl_table_data[table_type].global_ptr) = table_info->pointer;
348 table_info->owner_id = table_desc->owner_id;
349 table_info->installed_desc = table_desc;
351 return_ACPI_STATUS (AE_OK);
355 /*******************************************************************************
357 * FUNCTION: acpi_tb_delete_all_tables
363 * DESCRIPTION: Delete all internal ACPI tables
365 ******************************************************************************/
368 acpi_tb_delete_all_tables (
371 acpi_table_type type;
375 * Free memory allocated for ACPI tables
376 * Memory can either be mapped or allocated
378 for (type = 0; type < NUM_ACPI_TABLE_TYPES; type++) {
379 acpi_tb_delete_tables_by_type (type);
384 /*******************************************************************************
386 * FUNCTION: acpi_tb_delete_tables_by_type
388 * PARAMETERS: Type - The table type to be deleted
392 * DESCRIPTION: Delete an internal ACPI table
393 * Locks the ACPI table mutex
395 ******************************************************************************/
398 acpi_tb_delete_tables_by_type (
399 acpi_table_type type)
401 struct acpi_table_desc *table_desc;
406 ACPI_FUNCTION_TRACE_U32 ("tb_delete_tables_by_type", type);
409 if (type > ACPI_TABLE_MAX) {
413 if (ACPI_FAILURE (acpi_ut_acquire_mutex (ACPI_MTX_TABLES))) {
417 /* Clear the appropriate "typed" global table pointer */
420 case ACPI_TABLE_RSDP:
421 acpi_gbl_RSDP = NULL;
424 case ACPI_TABLE_DSDT:
425 acpi_gbl_DSDT = NULL;
428 case ACPI_TABLE_FADT:
429 acpi_gbl_FADT = NULL;
432 case ACPI_TABLE_FACS:
433 acpi_gbl_FACS = NULL;
436 case ACPI_TABLE_XSDT:
437 acpi_gbl_XSDT = NULL;
440 case ACPI_TABLE_SSDT:
441 case ACPI_TABLE_PSDT:
448 * 1) Get the head of the list
450 table_desc = acpi_gbl_table_lists[type].next;
451 count = acpi_gbl_table_lists[type].count;
454 * 2) Walk the entire list, deleting both the allocated tables
455 * and the table descriptors
457 for (i = 0; i < count; i++) {
458 table_desc = acpi_tb_uninstall_table (table_desc);
461 (void) acpi_ut_release_mutex (ACPI_MTX_TABLES);
466 /*******************************************************************************
468 * FUNCTION: acpi_tb_delete_single_table
470 * PARAMETERS: table_info - A table info struct
474 * DESCRIPTION: Low-level free for a single ACPI table. Handles cases where
475 * the table was allocated a buffer or was mapped.
477 ******************************************************************************/
480 acpi_tb_delete_single_table (
481 struct acpi_table_desc *table_desc)
484 /* Must have a valid table descriptor and pointer */
487 (!table_desc->pointer)) {
491 /* Valid table, determine type of memory allocation */
493 switch (table_desc->allocation) {
494 case ACPI_MEM_NOT_ALLOCATED:
497 case ACPI_MEM_ALLOCATED:
499 ACPI_MEM_FREE (table_desc->pointer);
502 case ACPI_MEM_MAPPED:
504 acpi_os_unmap_memory (table_desc->pointer, table_desc->length);
513 /*******************************************************************************
515 * FUNCTION: acpi_tb_uninstall_table
517 * PARAMETERS: table_info - A table info struct
519 * RETURN: Pointer to the next table in the list (of same type)
521 * DESCRIPTION: Free the memory associated with an internal ACPI table that
522 * is either installed or has never been installed.
523 * Table mutex should be locked.
525 ******************************************************************************/
527 struct acpi_table_desc *
528 acpi_tb_uninstall_table (
529 struct acpi_table_desc *table_desc)
531 struct acpi_table_desc *next_desc;
534 ACPI_FUNCTION_TRACE_PTR ("tb_uninstall_table", table_desc);
541 /* Unlink the descriptor from the doubly linked list */
543 if (table_desc->prev) {
544 table_desc->prev->next = table_desc->next;
547 /* Is first on list, update list head */
549 acpi_gbl_table_lists[table_desc->type].next = table_desc->next;
552 if (table_desc->next) {
553 table_desc->next->prev = table_desc->prev;
556 /* Free the memory allocated for the table itself */
558 acpi_tb_delete_single_table (table_desc);
560 /* Free the table descriptor */
562 next_desc = table_desc->next;
563 ACPI_MEM_FREE (table_desc);
565 /* Return pointer to the next descriptor */
567 return_PTR (next_desc);