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
52 ACPI_MODULE_NAME("tbxface")
53
54 /* Local prototypes */
55 static acpi_status acpi_tb_load_namespace(void);
56
57 static 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
acpi_allocate_root_table(u32 initial_table_count)73 acpi_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
108 acpi_status __init
acpi_initialize_tables(struct acpi_table_desc * initial_table_array,u32 initial_table_count,u8 allow_resize)109 acpi_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 ******************************************************************************/
acpi_reallocate_root_table(void)172 acpi_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 ******************************************************************************/
acpi_load_table(struct acpi_table_header * table_ptr)238 acpi_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
ACPI_EXPORT_SYMBOL(acpi_load_table)263 ACPI_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 ******************************************************************************/
281 acpi_status
282 acpi_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
ACPI_EXPORT_SYMBOL(acpi_get_table_header)340 ACPI_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 ******************************************************************************/
353 acpi_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
ACPI_EXPORT_SYMBOL(acpi_unload_table_id)379 ACPI_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 ******************************************************************************/
394 acpi_status
395 acpi_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 }
ACPI_EXPORT_SYMBOL(acpi_get_table_with_size)439 ACPI_EXPORT_SYMBOL(acpi_get_table_with_size)
440
441 acpi_status
442 acpi_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 }
ACPI_EXPORT_SYMBOL(acpi_get_table)450 ACPI_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 ******************************************************************************/
464 acpi_status
465 acpi_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
ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)504 ACPI_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 ******************************************************************************/
518 static 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
acpi_load_tables(void)631 acpi_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
ACPI_EXPORT_SYMBOL(acpi_load_tables)648 ACPI_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 ******************************************************************************/
663 acpi_status
664 acpi_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
ACPI_EXPORT_SYMBOL(acpi_install_table_handler)696 ACPI_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 ******************************************************************************/
710 acpi_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
ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)737 ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
738
739
740 static 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);
750