1 /******************************************************************************
3 * Module Name: tbxface - Public interfaces to the ACPI subsystem
4 * ACPI table oriented interfaces
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2006, R. Byron Moore
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
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
29 * Software Foundation.
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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42 * POSSIBILITY OF SUCH DAMAGES.
45 #include <acpi/acpi.h>
46 #include <acpi/acnamesp.h>
47 #include <acpi/actables.h>
49 #define _COMPONENT ACPI_TABLES
50 ACPI_MODULE_NAME("tbxface")
52 /* Local prototypes */
53 static acpi_status
acpi_tb_load_namespace(void);
55 /*******************************************************************************
57 * FUNCTION: acpi_initialize_tables
59 * PARAMETERS: initial_table_array - Pointer to an array of pre-allocated
60 * struct acpi_table_desc structures. If NULL, the
61 * array is dynamically allocated.
62 * initial_table_count - Size of initial_table_array, in number of
63 * struct acpi_table_desc structures
64 * allow_realloc - Flag to tell Table Manager if resize of
65 * pre-allocated array is allowed. Ignored
66 * if initial_table_array is NULL.
70 * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
72 * NOTE: Allows static allocation of the initial table array in order
73 * to avoid the use of dynamic memory in confined environments
74 * such as the kernel boot sequence where it may not be available.
76 * If the host OS memory managers are initialized, use NULL for
77 * initial_table_array, and the table will be dynamically allocated.
79 ******************************************************************************/
82 acpi_initialize_tables(struct acpi_table_desc
*initial_table_array
,
83 u32 initial_table_count
, u8 allow_resize
)
85 acpi_physical_address rsdp_address
;
88 ACPI_FUNCTION_TRACE(acpi_initialize_tables
);
91 * Set up the Root Table Array
92 * Allocate the table array if requested
94 if (!initial_table_array
) {
95 acpi_gbl_root_table_list
.size
= initial_table_count
;
96 acpi_gbl_root_table_list
.flags
= ACPI_ROOT_ALLOW_RESIZE
;
98 status
= acpi_tb_resize_root_table_list();
99 if (ACPI_FAILURE(status
)) {
100 return_ACPI_STATUS(status
);
103 /* Root Table Array has been statically allocated by the host */
105 ACPI_MEMSET(initial_table_array
, 0,
106 initial_table_count
*
107 sizeof(struct acpi_table_desc
));
109 acpi_gbl_root_table_list
.tables
= initial_table_array
;
110 acpi_gbl_root_table_list
.size
= initial_table_count
;
111 acpi_gbl_root_table_list
.flags
= ACPI_ROOT_ORIGIN_UNKNOWN
;
113 acpi_gbl_root_table_list
.flags
|=
114 ACPI_ROOT_ALLOW_RESIZE
;
118 /* Get the address of the RSDP */
120 rsdp_address
= acpi_os_get_root_pointer();
122 return_ACPI_STATUS(AE_NOT_FOUND
);
126 * Get the root table (RSDT or XSDT) and extract all entries to the local
127 * Root Table Array. This array contains the information of the RSDT/XSDT
128 * in a common, more useable format.
131 acpi_tb_parse_root_table(rsdp_address
, ACPI_TABLE_ORIGIN_MAPPED
);
132 return_ACPI_STATUS(status
);
135 /*******************************************************************************
137 * FUNCTION: acpi_reallocate_root_table
143 * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
144 * root list from the previously provided scratch area. Should
145 * be called once dynamic memory allocation is available in the
148 ******************************************************************************/
149 acpi_status
acpi_reallocate_root_table(void)
151 struct acpi_table_desc
*tables
;
154 ACPI_FUNCTION_TRACE(acpi_reallocate_root_table
);
157 * Only reallocate the root table if the host provided a static buffer
158 * for the table array in the call to acpi_initialize_tables.
160 if (acpi_gbl_root_table_list
.flags
& ACPI_ROOT_ORIGIN_ALLOCATED
) {
161 return_ACPI_STATUS(AE_SUPPORT
);
165 (acpi_gbl_root_table_list
.count
+
166 ACPI_ROOT_TABLE_SIZE_INCREMENT
) * sizeof(struct acpi_table_desc
);
168 /* Create new array and copy the old array */
170 tables
= ACPI_ALLOCATE_ZEROED(new_size
);
172 return_ACPI_STATUS(AE_NO_MEMORY
);
175 ACPI_MEMCPY(tables
, acpi_gbl_root_table_list
.tables
, new_size
);
177 acpi_gbl_root_table_list
.size
= acpi_gbl_root_table_list
.count
;
178 acpi_gbl_root_table_list
.tables
= tables
;
179 acpi_gbl_root_table_list
.flags
=
180 ACPI_ROOT_ORIGIN_ALLOCATED
| ACPI_ROOT_ALLOW_RESIZE
;
182 return_ACPI_STATUS(AE_OK
);
184 /*******************************************************************************
186 * FUNCTION: acpi_load_table
188 * PARAMETERS: table_ptr - pointer to a buffer containing the entire
193 * DESCRIPTION: This function is called to load a table from the caller's
194 * buffer. The buffer must contain an entire ACPI Table including
195 * a valid header. The header fields will be verified, and if it
196 * is determined that the table is invalid, the call will fail.
198 ******************************************************************************/
199 acpi_status
acpi_load_table(struct acpi_table_header
*table_ptr
)
202 acpi_native_uint table_index
;
205 * Install the new table into the local data structures
207 status
= acpi_tb_add_table(table_ptr
, &table_index
);
208 if (ACPI_FAILURE(status
)) {
209 return_ACPI_STATUS(status
);
211 status
= acpi_ns_load_table(table_index
, acpi_gbl_root_node
);
212 return_ACPI_STATUS(status
);
215 ACPI_EXPORT_SYMBOL(acpi_load_table
)
217 /******************************************************************************
219 * FUNCTION: acpi_get_table_header
221 * PARAMETERS: Signature - ACPI signature of needed table
222 * Instance - Which instance (for SSDTs)
223 * out_table_header - Where the pointer to the table header
226 * RETURN: Status and pointer to mapped table header
228 * DESCRIPTION: Finds an ACPI table header.
230 * NOTE: Caller is responsible in unmapping the header with
231 * acpi_os_unmap_memory
233 *****************************************************************************/
235 acpi_get_table_header(char *signature
,
236 acpi_native_uint instance
,
237 struct acpi_table_header
**out_table_header
)
242 /* Parameter validation */
244 if (!signature
|| !out_table_header
) {
245 return (AE_BAD_PARAMETER
);
249 * Walk the root table list
251 for (i
= 0, j
= 0; i
< acpi_gbl_root_table_list
.count
; i
++) {
252 if (!ACPI_COMPARE_NAME
253 (&(acpi_gbl_root_table_list
.tables
[i
].signature
),
258 if (++j
< instance
) {
263 acpi_tb_map(acpi_gbl_root_table_list
.tables
[i
].address
,
264 (u32
) sizeof(struct acpi_table_header
),
265 acpi_gbl_root_table_list
.tables
[i
].
266 flags
& ACPI_TABLE_ORIGIN_MASK
);
268 if (!(*out_table_header
)) {
269 return (AE_NO_MEMORY
);
275 return (AE_NOT_FOUND
);
278 ACPI_EXPORT_SYMBOL(acpi_get_table_header
)
281 /******************************************************************************
283 * FUNCTION: acpi_unload_table_id
285 * PARAMETERS: id - Owner ID of the table to be removed.
289 * DESCRIPTION: This routine is used to force the unload of a table (by id)
291 ******************************************************************************/
292 acpi_status
acpi_unload_table_id(acpi_owner_id id
)
295 acpi_status status
= AE_NOT_EXIST
;
297 ACPI_FUNCTION_TRACE(acpi_unload_table
);
299 /* Find table from the requested type list */
300 for (i
= 0; i
< acpi_gbl_root_table_list
.count
; ++i
) {
301 if (id
!= acpi_gbl_root_table_list
.tables
[i
].owner_id
) {
305 * Delete all namespace objects owned by this table. Note that these
306 * objects can appear anywhere in the namespace by virtue of the AML
307 * "Scope" operator. Thus, we need to track ownership by an ID, not
308 * simply a position within the hierarchy
310 acpi_tb_delete_namespace_by_owner(i
);
311 acpi_tb_release_owner_id(i
);
312 acpi_tb_set_table_loaded_flag(i
, FALSE
);
314 return_ACPI_STATUS(status
);
317 ACPI_EXPORT_SYMBOL(acpi_unload_table_id
)
319 /*******************************************************************************
321 * FUNCTION: acpi_get_table
323 * PARAMETERS: Signature - ACPI signature of needed table
324 * Instance - Which instance (for SSDTs)
325 * out_table - Where the pointer to the table is returned
327 * RETURN: Status and pointer to table
329 * DESCRIPTION: Finds and verifies an ACPI table.
331 *****************************************************************************/
333 acpi_get_table(char *signature
,
334 acpi_native_uint instance
, struct acpi_table_header
** out_table
)
340 /* Parameter validation */
342 if (!signature
|| !out_table
) {
343 return (AE_BAD_PARAMETER
);
347 * Walk the root table list
349 for (i
= 0, j
= 0; i
< acpi_gbl_root_table_list
.count
; i
++) {
350 if (!ACPI_COMPARE_NAME
351 (&(acpi_gbl_root_table_list
.tables
[i
].signature
),
356 if (++j
< instance
) {
361 acpi_tb_verify_table(&acpi_gbl_root_table_list
.tables
[i
]);
362 if (ACPI_SUCCESS(status
)) {
363 *out_table
= acpi_gbl_root_table_list
.tables
[i
].pointer
;
366 if (!acpi_gbl_permanent_mmap
) {
367 acpi_gbl_root_table_list
.tables
[i
].pointer
= 0;
373 return (AE_NOT_FOUND
);
376 ACPI_EXPORT_SYMBOL(acpi_get_table
)
378 /*******************************************************************************
380 * FUNCTION: acpi_get_table_by_index
382 * PARAMETERS: table_index - Table index
383 * Table - Where the pointer to the table is returned
385 * RETURN: Status and pointer to the table
387 * DESCRIPTION: Obtain a table by an index into the global table list.
389 ******************************************************************************/
391 acpi_get_table_by_index(acpi_native_uint table_index
,
392 struct acpi_table_header
** table
)
396 ACPI_FUNCTION_TRACE(acpi_get_table_by_index
);
398 /* Parameter validation */
401 return_ACPI_STATUS(AE_BAD_PARAMETER
);
404 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES
);
408 if (table_index
>= acpi_gbl_root_table_list
.count
) {
409 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES
);
410 return_ACPI_STATUS(AE_BAD_PARAMETER
);
413 if (!acpi_gbl_root_table_list
.tables
[table_index
].pointer
) {
415 /* Table is not mapped, map it */
418 acpi_tb_verify_table(&acpi_gbl_root_table_list
.
419 tables
[table_index
]);
420 if (ACPI_FAILURE(status
)) {
421 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES
);
422 return_ACPI_STATUS(status
);
426 *table
= acpi_gbl_root_table_list
.tables
[table_index
].pointer
;
427 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES
);
428 return_ACPI_STATUS(AE_OK
);
431 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index
)
433 /*******************************************************************************
435 * FUNCTION: acpi_tb_load_namespace
441 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
444 ******************************************************************************/
445 static acpi_status
acpi_tb_load_namespace(void)
448 struct acpi_table_header
*table
;
451 ACPI_FUNCTION_TRACE(tb_load_namespace
);
453 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES
);
456 * Load the namespace. The DSDT is required, but any SSDT and PSDT tables
459 if (!acpi_gbl_root_table_list
.count
||
461 (acpi_gbl_root_table_list
.
462 tables
[ACPI_TABLE_INDEX_DSDT
].signature
),
465 ACPI_FAILURE(acpi_tb_verify_table
466 (&acpi_gbl_root_table_list
.
467 tables
[ACPI_TABLE_INDEX_DSDT
]))) {
468 status
= AE_NO_ACPI_TABLES
;
469 goto unlock_and_exit
;
476 acpi_os_table_override(acpi_gbl_root_table_list
.
477 tables
[ACPI_TABLE_INDEX_DSDT
].pointer
,
479 if (ACPI_SUCCESS(status
) && table
) {
481 * DSDT table has been found
483 acpi_tb_delete_table(ACPI_TABLE_INDEX_DSDT
);
484 acpi_gbl_root_table_list
.tables
[ACPI_TABLE_INDEX_DSDT
].pointer
=
486 acpi_gbl_root_table_list
.tables
[ACPI_TABLE_INDEX_DSDT
].length
=
488 acpi_gbl_root_table_list
.tables
[ACPI_TABLE_INDEX_DSDT
].flags
=
489 ACPI_TABLE_ORIGIN_UNKNOWN
;
491 ACPI_INFO((AE_INFO
, "Table DSDT replaced by host OS"));
492 acpi_tb_print_table_header(0, table
);
496 acpi_tb_verify_table(&acpi_gbl_root_table_list
.
497 tables
[ACPI_TABLE_INDEX_DSDT
]);
498 if (ACPI_FAILURE(status
)) {
500 /* A valid DSDT is required */
502 status
= AE_NO_ACPI_TABLES
;
503 goto unlock_and_exit
;
506 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES
);
509 * Load and parse tables.
511 status
= acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT
, acpi_gbl_root_node
);
512 if (ACPI_FAILURE(status
)) {
513 return_ACPI_STATUS(status
);
517 * Load any SSDT or PSDT tables. Note: Loop leaves tables locked
519 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES
);
520 for (i
= 0; i
< acpi_gbl_root_table_list
.count
; ++i
) {
521 if ((!ACPI_COMPARE_NAME
522 (&(acpi_gbl_root_table_list
.tables
[i
].signature
),
526 (acpi_gbl_root_table_list
.tables
[i
].
527 signature
), ACPI_SIG_PSDT
))
529 ACPI_FAILURE(acpi_tb_verify_table
530 (&acpi_gbl_root_table_list
.tables
[i
]))) {
534 /* Ignore errors while loading tables, get as many as possible */
536 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES
);
537 (void)acpi_ns_load_table(i
, acpi_gbl_root_node
);
538 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES
);
541 ACPI_DEBUG_PRINT((ACPI_DB_INIT
, "ACPI Tables successfully acquired\n"));
544 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES
);
545 return_ACPI_STATUS(status
);
548 /*******************************************************************************
550 * FUNCTION: acpi_load_tables
556 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
558 ******************************************************************************/
560 acpi_status
acpi_load_tables(void)
564 ACPI_FUNCTION_TRACE(acpi_load_tables
);
567 * Load the namespace from the tables
569 status
= acpi_tb_load_namespace();
570 if (ACPI_FAILURE(status
)) {
571 ACPI_EXCEPTION((AE_INFO
, status
,
572 "While loading namespace from ACPI tables"));
575 return_ACPI_STATUS(status
);
578 ACPI_EXPORT_SYMBOL(acpi_load_tables
)