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.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
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
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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41 * POSSIBILITY OF SUCH DAMAGES.
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
);