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1/******************************************************************************
2 *
3 * Module Name: tbxface - Public interfaces to the ACPI subsystem
4 * ACPI table oriented interfaces
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2012, Intel Corp.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
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.
26 *
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.
30 *
31 * NO WARRANTY
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
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
45#include <linux/export.h>
46#include <acpi/acpi.h>
47#include "accommon.h"
48#include "acnamesp.h"
49#include "actables.h"
50
51#define _COMPONENT ACPI_TABLES
52ACPI_MODULE_NAME("tbxface")
53
54/* Local prototypes */
55static acpi_status acpi_tb_load_namespace(void);
56
57static int no_auto_ssdt;
58
59/*******************************************************************************
60 *
61 * FUNCTION: acpi_allocate_root_table
62 *
63 * PARAMETERS: initial_table_count - Size of initial_table_array, in number of
64 * struct acpi_table_desc structures
65 *
66 * RETURN: Status
67 *
68 * DESCRIPTION: Allocate a root table array. Used by i_aSL compiler and
69 * acpi_initialize_tables.
70 *
71 ******************************************************************************/
72
73acpi_status acpi_allocate_root_table(u32 initial_table_count)
74{
75
76 acpi_gbl_root_table_list.max_table_count = initial_table_count;
77 acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
78
79 return (acpi_tb_resize_root_table_list());
80}
81
82/*******************************************************************************
83 *
84 * FUNCTION: acpi_initialize_tables
85 *
86 * PARAMETERS: initial_table_array - Pointer to an array of pre-allocated
87 * struct acpi_table_desc structures. If NULL, the
88 * array is dynamically allocated.
89 * initial_table_count - Size of initial_table_array, in number of
90 * struct acpi_table_desc structures
91 * allow_realloc - Flag to tell Table Manager if resize of
92 * pre-allocated array is allowed. Ignored
93 * if initial_table_array is NULL.
94 *
95 * RETURN: Status
96 *
97 * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
98 *
99 * NOTE: Allows static allocation of the initial table array in order
100 * to avoid the use of dynamic memory in confined environments
101 * such as the kernel boot sequence where it may not be available.
102 *
103 * If the host OS memory managers are initialized, use NULL for
104 * initial_table_array, and the table will be dynamically allocated.
105 *
106 ******************************************************************************/
107
108acpi_status __init
109acpi_initialize_tables(struct acpi_table_desc * initial_table_array,
110 u32 initial_table_count, u8 allow_resize)
111{
112 acpi_physical_address rsdp_address;
113 acpi_status status;
114
115 ACPI_FUNCTION_TRACE(acpi_initialize_tables);
116
117 /*
118 * Set up the Root Table Array
119 * Allocate the table array if requested
120 */
121 if (!initial_table_array) {
122 status = acpi_allocate_root_table(initial_table_count);
123 if (ACPI_FAILURE(status)) {
124 return_ACPI_STATUS(status);
125 }
126 } else {
127 /* Root Table Array has been statically allocated by the host */
128
129 ACPI_MEMSET(initial_table_array, 0,
130 (acpi_size) initial_table_count *
131 sizeof(struct acpi_table_desc));
132
133 acpi_gbl_root_table_list.tables = initial_table_array;
134 acpi_gbl_root_table_list.max_table_count = initial_table_count;
135 acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
136 if (allow_resize) {
137 acpi_gbl_root_table_list.flags |=
138 ACPI_ROOT_ALLOW_RESIZE;
139 }
140 }
141
142 /* Get the address of the RSDP */
143
144 rsdp_address = acpi_os_get_root_pointer();
145 if (!rsdp_address) {
146 return_ACPI_STATUS(AE_NOT_FOUND);
147 }
148
149 /*
150 * Get the root table (RSDT or XSDT) and extract all entries to the local
151 * Root Table Array. This array contains the information of the RSDT/XSDT
152 * in a common, more useable format.
153 */
154 status = acpi_tb_parse_root_table(rsdp_address);
155 return_ACPI_STATUS(status);
156}
157
158/*******************************************************************************
159 *
160 * FUNCTION: acpi_reallocate_root_table
161 *
162 * PARAMETERS: None
163 *
164 * RETURN: Status
165 *
166 * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
167 * root list from the previously provided scratch area. Should
168 * be called once dynamic memory allocation is available in the
169 * kernel
170 *
171 ******************************************************************************/
172acpi_status acpi_reallocate_root_table(void)
173{
174 struct acpi_table_desc *tables;
175 acpi_size new_size;
176 acpi_size current_size;
177
178 ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
179
180 /*
181 * Only reallocate the root table if the host provided a static buffer
182 * for the table array in the call to acpi_initialize_tables.
183 */
184 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
185 return_ACPI_STATUS(AE_SUPPORT);
186 }
187
188 /*
189 * Get the current size of the root table and add the default
190 * increment to create the new table size.
191 */
192 current_size = (acpi_size)
193 acpi_gbl_root_table_list.current_table_count *
194 sizeof(struct acpi_table_desc);
195
196 new_size = current_size +
197 (ACPI_ROOT_TABLE_SIZE_INCREMENT * sizeof(struct acpi_table_desc));
198
199 /* Create new array and copy the old array */
200
201 tables = ACPI_ALLOCATE_ZEROED(new_size);
202 if (!tables) {
203 return_ACPI_STATUS(AE_NO_MEMORY);
204 }
205
206 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, current_size);
207
208 /*
209 * Update the root table descriptor. The new size will be the current
210 * number of tables plus the increment, independent of the reserved
211 * size of the original table list.
212 */
213 acpi_gbl_root_table_list.tables = tables;
214 acpi_gbl_root_table_list.max_table_count =
215 acpi_gbl_root_table_list.current_table_count +
216 ACPI_ROOT_TABLE_SIZE_INCREMENT;
217 acpi_gbl_root_table_list.flags =
218 ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;
219
220 return_ACPI_STATUS(AE_OK);
221}
222
223/*******************************************************************************
224 *
225 * FUNCTION: acpi_load_table
226 *
227 * PARAMETERS: table_ptr - pointer to a buffer containing the entire
228 * table to be loaded
229 *
230 * RETURN: Status
231 *
232 * DESCRIPTION: This function is called to load a table from the caller's
233 * buffer. The buffer must contain an entire ACPI Table including
234 * a valid header. The header fields will be verified, and if it
235 * is determined that the table is invalid, the call will fail.
236 *
237 ******************************************************************************/
238acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
239{
240 acpi_status status;
241 u32 table_index;
242 struct acpi_table_desc table_desc;
243
244 if (!table_ptr)
245 return AE_BAD_PARAMETER;
246
247 ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
248 table_desc.pointer = table_ptr;
249 table_desc.length = table_ptr->length;
250 table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
251
252 /*
253 * Install the new table into the local data structures
254 */
255 status = acpi_tb_add_table(&table_desc, &table_index);
256 if (ACPI_FAILURE(status)) {
257 return status;
258 }
259 status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
260 return status;
261}
262
263ACPI_EXPORT_SYMBOL(acpi_load_table)
264
265/*******************************************************************************
266 *
267 * FUNCTION: acpi_get_table_header
268 *
269 * PARAMETERS: Signature - ACPI signature of needed table
270 * Instance - Which instance (for SSDTs)
271 * out_table_header - The pointer to the table header to fill
272 *
273 * RETURN: Status and pointer to mapped table header
274 *
275 * DESCRIPTION: Finds an ACPI table header.
276 *
277 * NOTE: Caller is responsible in unmapping the header with
278 * acpi_os_unmap_memory
279 *
280 ******************************************************************************/
281acpi_status
282acpi_get_table_header(char *signature,
283 u32 instance, struct acpi_table_header *out_table_header)
284{
285 u32 i;
286 u32 j;
287 struct acpi_table_header *header;
288
289 /* Parameter validation */
290
291 if (!signature || !out_table_header) {
292 return (AE_BAD_PARAMETER);
293 }
294
295 /* Walk the root table list */
296
297 for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
298 i++) {
299 if (!ACPI_COMPARE_NAME
300 (&(acpi_gbl_root_table_list.tables[i].signature),
301 signature)) {
302 continue;
303 }
304
305 if (++j < instance) {
306 continue;
307 }
308
309 if (!acpi_gbl_root_table_list.tables[i].pointer) {
310 if ((acpi_gbl_root_table_list.tables[i].flags &
311 ACPI_TABLE_ORIGIN_MASK) ==
312 ACPI_TABLE_ORIGIN_MAPPED) {
313 header =
314 acpi_os_map_memory(acpi_gbl_root_table_list.
315 tables[i].address,
316 sizeof(struct
317 acpi_table_header));
318 if (!header) {
319 return AE_NO_MEMORY;
320 }
321 ACPI_MEMCPY(out_table_header, header,
322 sizeof(struct acpi_table_header));
323 acpi_os_unmap_memory(header,
324 sizeof(struct
325 acpi_table_header));
326 } else {
327 return AE_NOT_FOUND;
328 }
329 } else {
330 ACPI_MEMCPY(out_table_header,
331 acpi_gbl_root_table_list.tables[i].pointer,
332 sizeof(struct acpi_table_header));
333 }
334 return (AE_OK);
335 }
336
337 return (AE_NOT_FOUND);
338}
339
340ACPI_EXPORT_SYMBOL(acpi_get_table_header)
341
342/*******************************************************************************
343 *
344 * FUNCTION: acpi_unload_table_id
345 *
346 * PARAMETERS: id - Owner ID of the table to be removed.
347 *
348 * RETURN: Status
349 *
350 * DESCRIPTION: This routine is used to force the unload of a table (by id)
351 *
352 ******************************************************************************/
353acpi_status acpi_unload_table_id(acpi_owner_id id)
354{
355 int i;
356 acpi_status status = AE_NOT_EXIST;
357
358 ACPI_FUNCTION_TRACE(acpi_unload_table_id);
359
360 /* Find table in the global table list */
361 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
362 if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
363 continue;
364 }
365 /*
366 * Delete all namespace objects owned by this table. Note that these
367 * objects can appear anywhere in the namespace by virtue of the AML
368 * "Scope" operator. Thus, we need to track ownership by an ID, not
369 * simply a position within the hierarchy
370 */
371 acpi_tb_delete_namespace_by_owner(i);
372 status = acpi_tb_release_owner_id(i);
373 acpi_tb_set_table_loaded_flag(i, FALSE);
374 break;
375 }
376 return_ACPI_STATUS(status);
377}
378
379ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
380
381/*******************************************************************************
382 *
383 * FUNCTION: acpi_get_table_with_size
384 *
385 * PARAMETERS: Signature - ACPI signature of needed table
386 * Instance - Which instance (for SSDTs)
387 * out_table - Where the pointer to the table is returned
388 *
389 * RETURN: Status and pointer to table
390 *
391 * DESCRIPTION: Finds and verifies an ACPI table.
392 *
393 ******************************************************************************/
394acpi_status
395acpi_get_table_with_size(char *signature,
396 u32 instance, struct acpi_table_header **out_table,
397 acpi_size *tbl_size)
398{
399 u32 i;
400 u32 j;
401 acpi_status status;
402
403 /* Parameter validation */
404
405 if (!signature || !out_table) {
406 return (AE_BAD_PARAMETER);
407 }
408
409 /* Walk the root table list */
410
411 for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
412 i++) {
413 if (!ACPI_COMPARE_NAME
414 (&(acpi_gbl_root_table_list.tables[i].signature),
415 signature)) {
416 continue;
417 }
418
419 if (++j < instance) {
420 continue;
421 }
422
423 status =
424 acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
425 if (ACPI_SUCCESS(status)) {
426 *out_table = acpi_gbl_root_table_list.tables[i].pointer;
427 *tbl_size = acpi_gbl_root_table_list.tables[i].length;
428 }
429
430 if (!acpi_gbl_permanent_mmap) {
431 acpi_gbl_root_table_list.tables[i].pointer = NULL;
432 }
433
434 return (status);
435 }
436
437 return (AE_NOT_FOUND);
438}
439ACPI_EXPORT_SYMBOL(acpi_get_table_with_size)
440
441acpi_status
442acpi_get_table(char *signature,
443 u32 instance, struct acpi_table_header **out_table)
444{
445 acpi_size tbl_size;
446
447 return acpi_get_table_with_size(signature,
448 instance, out_table, &tbl_size);
449}
450ACPI_EXPORT_SYMBOL(acpi_get_table)
451
452/*******************************************************************************
453 *
454 * FUNCTION: acpi_get_table_by_index
455 *
456 * PARAMETERS: table_index - Table index
457 * Table - Where the pointer to the table is returned
458 *
459 * RETURN: Status and pointer to the table
460 *
461 * DESCRIPTION: Obtain a table by an index into the global table list.
462 *
463 ******************************************************************************/
464acpi_status
465acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
466{
467 acpi_status status;
468
469 ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
470
471 /* Parameter validation */
472
473 if (!table) {
474 return_ACPI_STATUS(AE_BAD_PARAMETER);
475 }
476
477 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
478
479 /* Validate index */
480
481 if (table_index >= acpi_gbl_root_table_list.current_table_count) {
482 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
483 return_ACPI_STATUS(AE_BAD_PARAMETER);
484 }
485
486 if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
487
488 /* Table is not mapped, map it */
489
490 status =
491 acpi_tb_verify_table(&acpi_gbl_root_table_list.
492 tables[table_index]);
493 if (ACPI_FAILURE(status)) {
494 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
495 return_ACPI_STATUS(status);
496 }
497 }
498
499 *table = acpi_gbl_root_table_list.tables[table_index].pointer;
500 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
501 return_ACPI_STATUS(AE_OK);
502}
503
504ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
505
506/*******************************************************************************
507 *
508 * FUNCTION: acpi_tb_load_namespace
509 *
510 * PARAMETERS: None
511 *
512 * RETURN: Status
513 *
514 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
515 * the RSDT/XSDT.
516 *
517 ******************************************************************************/
518static acpi_status acpi_tb_load_namespace(void)
519{
520 acpi_status status;
521 u32 i;
522 struct acpi_table_header *new_dsdt;
523
524 ACPI_FUNCTION_TRACE(tb_load_namespace);
525
526 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
527
528 /*
529 * Load the namespace. The DSDT is required, but any SSDT and
530 * PSDT tables are optional. Verify the DSDT.
531 */
532 if (!acpi_gbl_root_table_list.current_table_count ||
533 !ACPI_COMPARE_NAME(&
534 (acpi_gbl_root_table_list.
535 tables[ACPI_TABLE_INDEX_DSDT].signature),
536 ACPI_SIG_DSDT)
537 ||
538 ACPI_FAILURE(acpi_tb_verify_table
539 (&acpi_gbl_root_table_list.
540 tables[ACPI_TABLE_INDEX_DSDT]))) {
541 status = AE_NO_ACPI_TABLES;
542 goto unlock_and_exit;
543 }
544
545 /*
546 * Save the DSDT pointer for simple access. This is the mapped memory
547 * address. We must take care here because the address of the .Tables
548 * array can change dynamically as tables are loaded at run-time. Note:
549 * .Pointer field is not validated until after call to acpi_tb_verify_table.
550 */
551 acpi_gbl_DSDT =
552 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer;
553
554 /*
555 * Optionally copy the entire DSDT to local memory (instead of simply
556 * mapping it.) There are some BIOSs that corrupt or replace the original
557 * DSDT, creating the need for this option. Default is FALSE, do not copy
558 * the DSDT.
559 */
560 if (acpi_gbl_copy_dsdt_locally) {
561 new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT);
562 if (new_dsdt) {
563 acpi_gbl_DSDT = new_dsdt;
564 }
565 }
566
567 /*
568 * Save the original DSDT header for detection of table corruption
569 * and/or replacement of the DSDT from outside the OS.
570 */
571 ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
572 sizeof(struct acpi_table_header));
573
574 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
575
576 /* Load and parse tables */
577
578 status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
579 if (ACPI_FAILURE(status)) {
580 return_ACPI_STATUS(status);
581 }
582
583 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
584
585 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
586 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
587 if ((!ACPI_COMPARE_NAME
588 (&(acpi_gbl_root_table_list.tables[i].signature),
589 ACPI_SIG_SSDT)
590 &&
591 !ACPI_COMPARE_NAME(&
592 (acpi_gbl_root_table_list.tables[i].
593 signature), ACPI_SIG_PSDT))
594 ||
595 ACPI_FAILURE(acpi_tb_verify_table
596 (&acpi_gbl_root_table_list.tables[i]))) {
597 continue;
598 }
599
600 if (no_auto_ssdt) {
601 printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
602 continue;
603 }
604
605 /* Ignore errors while loading tables, get as many as possible */
606
607 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
608 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
609 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
610 }
611
612 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
613
614 unlock_and_exit:
615 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
616 return_ACPI_STATUS(status);
617}
618
619/*******************************************************************************
620 *
621 * FUNCTION: acpi_load_tables
622 *
623 * PARAMETERS: None
624 *
625 * RETURN: Status
626 *
627 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
628 *
629 ******************************************************************************/
630
631acpi_status acpi_load_tables(void)
632{
633 acpi_status status;
634
635 ACPI_FUNCTION_TRACE(acpi_load_tables);
636
637 /* Load the namespace from the tables */
638
639 status = acpi_tb_load_namespace();
640 if (ACPI_FAILURE(status)) {
641 ACPI_EXCEPTION((AE_INFO, status,
642 "While loading namespace from ACPI tables"));
643 }
644
645 return_ACPI_STATUS(status);
646}
647
648ACPI_EXPORT_SYMBOL(acpi_load_tables)
649
650
651/*******************************************************************************
652 *
653 * FUNCTION: acpi_install_table_handler
654 *
655 * PARAMETERS: Handler - Table event handler
656 * Context - Value passed to the handler on each event
657 *
658 * RETURN: Status
659 *
660 * DESCRIPTION: Install table event handler
661 *
662 ******************************************************************************/
663acpi_status
664acpi_install_table_handler(acpi_tbl_handler handler, void *context)
665{
666 acpi_status status;
667
668 ACPI_FUNCTION_TRACE(acpi_install_table_handler);
669
670 if (!handler) {
671 return_ACPI_STATUS(AE_BAD_PARAMETER);
672 }
673
674 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
675 if (ACPI_FAILURE(status)) {
676 return_ACPI_STATUS(status);
677 }
678
679 /* Don't allow more than one handler */
680
681 if (acpi_gbl_table_handler) {
682 status = AE_ALREADY_EXISTS;
683 goto cleanup;
684 }
685
686 /* Install the handler */
687
688 acpi_gbl_table_handler = handler;
689 acpi_gbl_table_handler_context = context;
690
691 cleanup:
692 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
693 return_ACPI_STATUS(status);
694}
695
696ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
697
698/*******************************************************************************
699 *
700 * FUNCTION: acpi_remove_table_handler
701 *
702 * PARAMETERS: Handler - Table event handler that was installed
703 * previously.
704 *
705 * RETURN: Status
706 *
707 * DESCRIPTION: Remove table event handler
708 *
709 ******************************************************************************/
710acpi_status acpi_remove_table_handler(acpi_tbl_handler handler)
711{
712 acpi_status status;
713
714 ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
715
716 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
717 if (ACPI_FAILURE(status)) {
718 return_ACPI_STATUS(status);
719 }
720
721 /* Make sure that the installed handler is the same */
722
723 if (!handler || handler != acpi_gbl_table_handler) {
724 status = AE_BAD_PARAMETER;
725 goto cleanup;
726 }
727
728 /* Remove the handler */
729
730 acpi_gbl_table_handler = NULL;
731
732 cleanup:
733 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
734 return_ACPI_STATUS(status);
735}
736
737ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
738
739
740static int __init acpi_no_auto_ssdt_setup(char *s) {
741
742 printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n");
743
744 no_auto_ssdt = 1;
745
746 return 1;
747}
748
749__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);
1/******************************************************************************
2 *
3 * Module Name: tbxface - Public interfaces to the ACPI subsystem
4 * ACPI table oriented interfaces
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2011, Intel Corp.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
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.
26 *
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.
30 *
31 * NO WARRANTY
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
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
45#include <acpi/acpi.h>
46#include "accommon.h"
47#include "acnamesp.h"
48#include "actables.h"
49
50#define _COMPONENT ACPI_TABLES
51ACPI_MODULE_NAME("tbxface")
52
53/* Local prototypes */
54static acpi_status acpi_tb_load_namespace(void);
55
56static int no_auto_ssdt;
57
58/*******************************************************************************
59 *
60 * FUNCTION: acpi_allocate_root_table
61 *
62 * PARAMETERS: initial_table_count - Size of initial_table_array, in number of
63 * struct acpi_table_desc structures
64 *
65 * RETURN: Status
66 *
67 * DESCRIPTION: Allocate a root table array. Used by i_aSL compiler and
68 * acpi_initialize_tables.
69 *
70 ******************************************************************************/
71
72acpi_status acpi_allocate_root_table(u32 initial_table_count)
73{
74
75 acpi_gbl_root_table_list.max_table_count = initial_table_count;
76 acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
77
78 return (acpi_tb_resize_root_table_list());
79}
80
81/*******************************************************************************
82 *
83 * FUNCTION: acpi_initialize_tables
84 *
85 * PARAMETERS: initial_table_array - Pointer to an array of pre-allocated
86 * struct acpi_table_desc structures. If NULL, the
87 * array is dynamically allocated.
88 * initial_table_count - Size of initial_table_array, in number of
89 * struct acpi_table_desc structures
90 * allow_realloc - Flag to tell Table Manager if resize of
91 * pre-allocated array is allowed. Ignored
92 * if initial_table_array is NULL.
93 *
94 * RETURN: Status
95 *
96 * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
97 *
98 * NOTE: Allows static allocation of the initial table array in order
99 * to avoid the use of dynamic memory in confined environments
100 * such as the kernel boot sequence where it may not be available.
101 *
102 * If the host OS memory managers are initialized, use NULL for
103 * initial_table_array, and the table will be dynamically allocated.
104 *
105 ******************************************************************************/
106
107acpi_status __init
108acpi_initialize_tables(struct acpi_table_desc * initial_table_array,
109 u32 initial_table_count, u8 allow_resize)
110{
111 acpi_physical_address rsdp_address;
112 acpi_status status;
113
114 ACPI_FUNCTION_TRACE(acpi_initialize_tables);
115
116 /*
117 * Set up the Root Table Array
118 * Allocate the table array if requested
119 */
120 if (!initial_table_array) {
121 status = acpi_allocate_root_table(initial_table_count);
122 if (ACPI_FAILURE(status)) {
123 return_ACPI_STATUS(status);
124 }
125 } else {
126 /* Root Table Array has been statically allocated by the host */
127
128 ACPI_MEMSET(initial_table_array, 0,
129 (acpi_size) initial_table_count *
130 sizeof(struct acpi_table_desc));
131
132 acpi_gbl_root_table_list.tables = initial_table_array;
133 acpi_gbl_root_table_list.max_table_count = initial_table_count;
134 acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
135 if (allow_resize) {
136 acpi_gbl_root_table_list.flags |=
137 ACPI_ROOT_ALLOW_RESIZE;
138 }
139 }
140
141 /* Get the address of the RSDP */
142
143 rsdp_address = acpi_os_get_root_pointer();
144 if (!rsdp_address) {
145 return_ACPI_STATUS(AE_NOT_FOUND);
146 }
147
148 /*
149 * Get the root table (RSDT or XSDT) and extract all entries to the local
150 * Root Table Array. This array contains the information of the RSDT/XSDT
151 * in a common, more useable format.
152 */
153 status = acpi_tb_parse_root_table(rsdp_address);
154 return_ACPI_STATUS(status);
155}
156
157/*******************************************************************************
158 *
159 * FUNCTION: acpi_reallocate_root_table
160 *
161 * PARAMETERS: None
162 *
163 * RETURN: Status
164 *
165 * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
166 * root list from the previously provided scratch area. Should
167 * be called once dynamic memory allocation is available in the
168 * kernel
169 *
170 ******************************************************************************/
171acpi_status acpi_reallocate_root_table(void)
172{
173 struct acpi_table_desc *tables;
174 acpi_size new_size;
175 acpi_size current_size;
176
177 ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
178
179 /*
180 * Only reallocate the root table if the host provided a static buffer
181 * for the table array in the call to acpi_initialize_tables.
182 */
183 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
184 return_ACPI_STATUS(AE_SUPPORT);
185 }
186
187 /*
188 * Get the current size of the root table and add the default
189 * increment to create the new table size.
190 */
191 current_size = (acpi_size)
192 acpi_gbl_root_table_list.current_table_count *
193 sizeof(struct acpi_table_desc);
194
195 new_size = current_size +
196 (ACPI_ROOT_TABLE_SIZE_INCREMENT * sizeof(struct acpi_table_desc));
197
198 /* Create new array and copy the old array */
199
200 tables = ACPI_ALLOCATE_ZEROED(new_size);
201 if (!tables) {
202 return_ACPI_STATUS(AE_NO_MEMORY);
203 }
204
205 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, current_size);
206
207 /*
208 * Update the root table descriptor. The new size will be the current
209 * number of tables plus the increment, independent of the reserved
210 * size of the original table list.
211 */
212 acpi_gbl_root_table_list.tables = tables;
213 acpi_gbl_root_table_list.max_table_count =
214 acpi_gbl_root_table_list.current_table_count +
215 ACPI_ROOT_TABLE_SIZE_INCREMENT;
216 acpi_gbl_root_table_list.flags =
217 ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;
218
219 return_ACPI_STATUS(AE_OK);
220}
221
222/*******************************************************************************
223 *
224 * FUNCTION: acpi_load_table
225 *
226 * PARAMETERS: table_ptr - pointer to a buffer containing the entire
227 * table to be loaded
228 *
229 * RETURN: Status
230 *
231 * DESCRIPTION: This function is called to load a table from the caller's
232 * buffer. The buffer must contain an entire ACPI Table including
233 * a valid header. The header fields will be verified, and if it
234 * is determined that the table is invalid, the call will fail.
235 *
236 ******************************************************************************/
237acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
238{
239 acpi_status status;
240 u32 table_index;
241 struct acpi_table_desc table_desc;
242
243 if (!table_ptr)
244 return AE_BAD_PARAMETER;
245
246 ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
247 table_desc.pointer = table_ptr;
248 table_desc.length = table_ptr->length;
249 table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
250
251 /*
252 * Install the new table into the local data structures
253 */
254 status = acpi_tb_add_table(&table_desc, &table_index);
255 if (ACPI_FAILURE(status)) {
256 return status;
257 }
258 status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
259 return status;
260}
261
262ACPI_EXPORT_SYMBOL(acpi_load_table)
263
264/*******************************************************************************
265 *
266 * FUNCTION: acpi_get_table_header
267 *
268 * PARAMETERS: Signature - ACPI signature of needed table
269 * Instance - Which instance (for SSDTs)
270 * out_table_header - The pointer to the table header to fill
271 *
272 * RETURN: Status and pointer to mapped table header
273 *
274 * DESCRIPTION: Finds an ACPI table header.
275 *
276 * NOTE: Caller is responsible in unmapping the header with
277 * acpi_os_unmap_memory
278 *
279 ******************************************************************************/
280acpi_status
281acpi_get_table_header(char *signature,
282 u32 instance, struct acpi_table_header *out_table_header)
283{
284 u32 i;
285 u32 j;
286 struct acpi_table_header *header;
287
288 /* Parameter validation */
289
290 if (!signature || !out_table_header) {
291 return (AE_BAD_PARAMETER);
292 }
293
294 /* Walk the root table list */
295
296 for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
297 i++) {
298 if (!ACPI_COMPARE_NAME
299 (&(acpi_gbl_root_table_list.tables[i].signature),
300 signature)) {
301 continue;
302 }
303
304 if (++j < instance) {
305 continue;
306 }
307
308 if (!acpi_gbl_root_table_list.tables[i].pointer) {
309 if ((acpi_gbl_root_table_list.tables[i].flags &
310 ACPI_TABLE_ORIGIN_MASK) ==
311 ACPI_TABLE_ORIGIN_MAPPED) {
312 header =
313 acpi_os_map_memory(acpi_gbl_root_table_list.
314 tables[i].address,
315 sizeof(struct
316 acpi_table_header));
317 if (!header) {
318 return AE_NO_MEMORY;
319 }
320 ACPI_MEMCPY(out_table_header, header,
321 sizeof(struct acpi_table_header));
322 acpi_os_unmap_memory(header,
323 sizeof(struct
324 acpi_table_header));
325 } else {
326 return AE_NOT_FOUND;
327 }
328 } else {
329 ACPI_MEMCPY(out_table_header,
330 acpi_gbl_root_table_list.tables[i].pointer,
331 sizeof(struct acpi_table_header));
332 }
333 return (AE_OK);
334 }
335
336 return (AE_NOT_FOUND);
337}
338
339ACPI_EXPORT_SYMBOL(acpi_get_table_header)
340
341/*******************************************************************************
342 *
343 * FUNCTION: acpi_unload_table_id
344 *
345 * PARAMETERS: id - Owner ID of the table to be removed.
346 *
347 * RETURN: Status
348 *
349 * DESCRIPTION: This routine is used to force the unload of a table (by id)
350 *
351 ******************************************************************************/
352acpi_status acpi_unload_table_id(acpi_owner_id id)
353{
354 int i;
355 acpi_status status = AE_NOT_EXIST;
356
357 ACPI_FUNCTION_TRACE(acpi_unload_table_id);
358
359 /* Find table in the global table list */
360 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
361 if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
362 continue;
363 }
364 /*
365 * Delete all namespace objects owned by this table. Note that these
366 * objects can appear anywhere in the namespace by virtue of the AML
367 * "Scope" operator. Thus, we need to track ownership by an ID, not
368 * simply a position within the hierarchy
369 */
370 acpi_tb_delete_namespace_by_owner(i);
371 status = acpi_tb_release_owner_id(i);
372 acpi_tb_set_table_loaded_flag(i, FALSE);
373 break;
374 }
375 return_ACPI_STATUS(status);
376}
377
378ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
379
380/*******************************************************************************
381 *
382 * FUNCTION: acpi_get_table_with_size
383 *
384 * PARAMETERS: Signature - ACPI signature of needed table
385 * Instance - Which instance (for SSDTs)
386 * out_table - Where the pointer to the table is returned
387 *
388 * RETURN: Status and pointer to table
389 *
390 * DESCRIPTION: Finds and verifies an ACPI table.
391 *
392 ******************************************************************************/
393acpi_status
394acpi_get_table_with_size(char *signature,
395 u32 instance, struct acpi_table_header **out_table,
396 acpi_size *tbl_size)
397{
398 u32 i;
399 u32 j;
400 acpi_status status;
401
402 /* Parameter validation */
403
404 if (!signature || !out_table) {
405 return (AE_BAD_PARAMETER);
406 }
407
408 /* Walk the root table list */
409
410 for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
411 i++) {
412 if (!ACPI_COMPARE_NAME
413 (&(acpi_gbl_root_table_list.tables[i].signature),
414 signature)) {
415 continue;
416 }
417
418 if (++j < instance) {
419 continue;
420 }
421
422 status =
423 acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
424 if (ACPI_SUCCESS(status)) {
425 *out_table = acpi_gbl_root_table_list.tables[i].pointer;
426 *tbl_size = acpi_gbl_root_table_list.tables[i].length;
427 }
428
429 if (!acpi_gbl_permanent_mmap) {
430 acpi_gbl_root_table_list.tables[i].pointer = NULL;
431 }
432
433 return (status);
434 }
435
436 return (AE_NOT_FOUND);
437}
438
439acpi_status
440acpi_get_table(char *signature,
441 u32 instance, struct acpi_table_header **out_table)
442{
443 acpi_size tbl_size;
444
445 return acpi_get_table_with_size(signature,
446 instance, out_table, &tbl_size);
447}
448ACPI_EXPORT_SYMBOL(acpi_get_table)
449
450/*******************************************************************************
451 *
452 * FUNCTION: acpi_get_table_by_index
453 *
454 * PARAMETERS: table_index - Table index
455 * Table - Where the pointer to the table is returned
456 *
457 * RETURN: Status and pointer to the table
458 *
459 * DESCRIPTION: Obtain a table by an index into the global table list.
460 *
461 ******************************************************************************/
462acpi_status
463acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
464{
465 acpi_status status;
466
467 ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
468
469 /* Parameter validation */
470
471 if (!table) {
472 return_ACPI_STATUS(AE_BAD_PARAMETER);
473 }
474
475 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
476
477 /* Validate index */
478
479 if (table_index >= acpi_gbl_root_table_list.current_table_count) {
480 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
481 return_ACPI_STATUS(AE_BAD_PARAMETER);
482 }
483
484 if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
485
486 /* Table is not mapped, map it */
487
488 status =
489 acpi_tb_verify_table(&acpi_gbl_root_table_list.
490 tables[table_index]);
491 if (ACPI_FAILURE(status)) {
492 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
493 return_ACPI_STATUS(status);
494 }
495 }
496
497 *table = acpi_gbl_root_table_list.tables[table_index].pointer;
498 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
499 return_ACPI_STATUS(AE_OK);
500}
501
502ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
503
504/*******************************************************************************
505 *
506 * FUNCTION: acpi_tb_load_namespace
507 *
508 * PARAMETERS: None
509 *
510 * RETURN: Status
511 *
512 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
513 * the RSDT/XSDT.
514 *
515 ******************************************************************************/
516static acpi_status acpi_tb_load_namespace(void)
517{
518 acpi_status status;
519 u32 i;
520 struct acpi_table_header *new_dsdt;
521
522 ACPI_FUNCTION_TRACE(tb_load_namespace);
523
524 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
525
526 /*
527 * Load the namespace. The DSDT is required, but any SSDT and
528 * PSDT tables are optional. Verify the DSDT.
529 */
530 if (!acpi_gbl_root_table_list.current_table_count ||
531 !ACPI_COMPARE_NAME(&
532 (acpi_gbl_root_table_list.
533 tables[ACPI_TABLE_INDEX_DSDT].signature),
534 ACPI_SIG_DSDT)
535 ||
536 ACPI_FAILURE(acpi_tb_verify_table
537 (&acpi_gbl_root_table_list.
538 tables[ACPI_TABLE_INDEX_DSDT]))) {
539 status = AE_NO_ACPI_TABLES;
540 goto unlock_and_exit;
541 }
542
543 /*
544 * Save the DSDT pointer for simple access. This is the mapped memory
545 * address. We must take care here because the address of the .Tables
546 * array can change dynamically as tables are loaded at run-time. Note:
547 * .Pointer field is not validated until after call to acpi_tb_verify_table.
548 */
549 acpi_gbl_DSDT =
550 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer;
551
552 /*
553 * Optionally copy the entire DSDT to local memory (instead of simply
554 * mapping it.) There are some BIOSs that corrupt or replace the original
555 * DSDT, creating the need for this option. Default is FALSE, do not copy
556 * the DSDT.
557 */
558 if (acpi_gbl_copy_dsdt_locally) {
559 new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT);
560 if (new_dsdt) {
561 acpi_gbl_DSDT = new_dsdt;
562 }
563 }
564
565 /*
566 * Save the original DSDT header for detection of table corruption
567 * and/or replacement of the DSDT from outside the OS.
568 */
569 ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
570 sizeof(struct acpi_table_header));
571
572 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
573
574 /* Load and parse tables */
575
576 status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
577 if (ACPI_FAILURE(status)) {
578 return_ACPI_STATUS(status);
579 }
580
581 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
582
583 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
584 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
585 if ((!ACPI_COMPARE_NAME
586 (&(acpi_gbl_root_table_list.tables[i].signature),
587 ACPI_SIG_SSDT)
588 &&
589 !ACPI_COMPARE_NAME(&
590 (acpi_gbl_root_table_list.tables[i].
591 signature), ACPI_SIG_PSDT))
592 ||
593 ACPI_FAILURE(acpi_tb_verify_table
594 (&acpi_gbl_root_table_list.tables[i]))) {
595 continue;
596 }
597
598 if (no_auto_ssdt) {
599 printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
600 continue;
601 }
602
603 /* Ignore errors while loading tables, get as many as possible */
604
605 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
606 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
607 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
608 }
609
610 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
611
612 unlock_and_exit:
613 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
614 return_ACPI_STATUS(status);
615}
616
617/*******************************************************************************
618 *
619 * FUNCTION: acpi_load_tables
620 *
621 * PARAMETERS: None
622 *
623 * RETURN: Status
624 *
625 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
626 *
627 ******************************************************************************/
628
629acpi_status acpi_load_tables(void)
630{
631 acpi_status status;
632
633 ACPI_FUNCTION_TRACE(acpi_load_tables);
634
635 /* Load the namespace from the tables */
636
637 status = acpi_tb_load_namespace();
638 if (ACPI_FAILURE(status)) {
639 ACPI_EXCEPTION((AE_INFO, status,
640 "While loading namespace from ACPI tables"));
641 }
642
643 return_ACPI_STATUS(status);
644}
645
646ACPI_EXPORT_SYMBOL(acpi_load_tables)
647
648
649/*******************************************************************************
650 *
651 * FUNCTION: acpi_install_table_handler
652 *
653 * PARAMETERS: Handler - Table event handler
654 * Context - Value passed to the handler on each event
655 *
656 * RETURN: Status
657 *
658 * DESCRIPTION: Install table event handler
659 *
660 ******************************************************************************/
661acpi_status
662acpi_install_table_handler(acpi_tbl_handler handler, void *context)
663{
664 acpi_status status;
665
666 ACPI_FUNCTION_TRACE(acpi_install_table_handler);
667
668 if (!handler) {
669 return_ACPI_STATUS(AE_BAD_PARAMETER);
670 }
671
672 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
673 if (ACPI_FAILURE(status)) {
674 return_ACPI_STATUS(status);
675 }
676
677 /* Don't allow more than one handler */
678
679 if (acpi_gbl_table_handler) {
680 status = AE_ALREADY_EXISTS;
681 goto cleanup;
682 }
683
684 /* Install the handler */
685
686 acpi_gbl_table_handler = handler;
687 acpi_gbl_table_handler_context = context;
688
689 cleanup:
690 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
691 return_ACPI_STATUS(status);
692}
693
694ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
695
696/*******************************************************************************
697 *
698 * FUNCTION: acpi_remove_table_handler
699 *
700 * PARAMETERS: Handler - Table event handler that was installed
701 * previously.
702 *
703 * RETURN: Status
704 *
705 * DESCRIPTION: Remove table event handler
706 *
707 ******************************************************************************/
708acpi_status acpi_remove_table_handler(acpi_tbl_handler handler)
709{
710 acpi_status status;
711
712 ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
713
714 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
715 if (ACPI_FAILURE(status)) {
716 return_ACPI_STATUS(status);
717 }
718
719 /* Make sure that the installed handler is the same */
720
721 if (!handler || handler != acpi_gbl_table_handler) {
722 status = AE_BAD_PARAMETER;
723 goto cleanup;
724 }
725
726 /* Remove the handler */
727
728 acpi_gbl_table_handler = NULL;
729
730 cleanup:
731 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
732 return_ACPI_STATUS(status);
733}
734
735ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
736
737
738static int __init acpi_no_auto_ssdt_setup(char *s) {
739
740 printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n");
741
742 no_auto_ssdt = 1;
743
744 return 1;
745}
746
747__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);