tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 - 2008, 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 <acpi/acnamesp.h>
47#include <acpi/actables.h>
48
49#define _COMPONENT ACPI_TABLES
50ACPI_MODULE_NAME("tbxface")
51
52/* Local prototypes */
53static acpi_status acpi_tb_load_namespace(void);
54
55static int no_auto_ssdt;
56
57/*******************************************************************************
58 *
59 * FUNCTION: acpi_allocate_root_table
60 *
61 * PARAMETERS: initial_table_count - Size of initial_table_array, in number of
62 * struct acpi_table_desc structures
63 *
64 * RETURN: Status
65 *
66 * DESCRIPTION: Allocate a root table array. Used by i_aSL compiler and
67 * acpi_initialize_tables.
68 *
69 ******************************************************************************/
70
71acpi_status acpi_allocate_root_table(u32 initial_table_count)
72{
73
74 acpi_gbl_root_table_list.size = initial_table_count;
75 acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
76
77 return (acpi_tb_resize_root_table_list());
78}
79
80/*******************************************************************************
81 *
82 * FUNCTION: acpi_initialize_tables
83 *
84 * PARAMETERS: initial_table_array - Pointer to an array of pre-allocated
85 * struct acpi_table_desc structures. If NULL, the
86 * array is dynamically allocated.
87 * initial_table_count - Size of initial_table_array, in number of
88 * struct acpi_table_desc structures
89 * allow_realloc - Flag to tell Table Manager if resize of
90 * pre-allocated array is allowed. Ignored
91 * if initial_table_array is NULL.
92 *
93 * RETURN: Status
94 *
95 * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
96 *
97 * NOTE: Allows static allocation of the initial table array in order
98 * to avoid the use of dynamic memory in confined environments
99 * such as the kernel boot sequence where it may not be available.
100 *
101 * If the host OS memory managers are initialized, use NULL for
102 * initial_table_array, and the table will be dynamically allocated.
103 *
104 ******************************************************************************/
105
106acpi_status __init
107acpi_initialize_tables(struct acpi_table_desc * initial_table_array,
108 u32 initial_table_count, u8 allow_resize)
109{
110 acpi_physical_address rsdp_address;
111 acpi_status status;
112
113 ACPI_FUNCTION_TRACE(acpi_initialize_tables);
114
115 /*
116 * Set up the Root Table Array
117 * Allocate the table array if requested
118 */
119 if (!initial_table_array) {
120 status = acpi_allocate_root_table(initial_table_count);
121 if (ACPI_FAILURE(status)) {
122 return_ACPI_STATUS(status);
123 }
124 } else {
125 /* Root Table Array has been statically allocated by the host */
126
127 ACPI_MEMSET(initial_table_array, 0,
128 (acpi_size) initial_table_count *
129 sizeof(struct acpi_table_desc));
130
131 acpi_gbl_root_table_list.tables = initial_table_array;
132 acpi_gbl_root_table_list.size = initial_table_count;
133 acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
134 if (allow_resize) {
135 acpi_gbl_root_table_list.flags |=
136 ACPI_ROOT_ALLOW_RESIZE;
137 }
138 }
139
140 /* Get the address of the RSDP */
141
142 rsdp_address = acpi_os_get_root_pointer();
143 if (!rsdp_address) {
144 return_ACPI_STATUS(AE_NOT_FOUND);
145 }
146
147 /*
148 * Get the root table (RSDT or XSDT) and extract all entries to the local
149 * Root Table Array. This array contains the information of the RSDT/XSDT
150 * in a common, more useable format.
151 */
152 status =
153 acpi_tb_parse_root_table(rsdp_address, ACPI_TABLE_ORIGIN_MAPPED);
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
176 ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
177
178 /*
179 * Only reallocate the root table if the host provided a static buffer
180 * for the table array in the call to acpi_initialize_tables.
181 */
182 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
183 return_ACPI_STATUS(AE_SUPPORT);
184 }
185
186 new_size = ((acpi_size) acpi_gbl_root_table_list.count +
187 ACPI_ROOT_TABLE_SIZE_INCREMENT) *
188 sizeof(struct acpi_table_desc);
189
190 /* Create new array and copy the old array */
191
192 tables = ACPI_ALLOCATE_ZEROED(new_size);
193 if (!tables) {
194 return_ACPI_STATUS(AE_NO_MEMORY);
195 }
196
197 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, new_size);
198
199 acpi_gbl_root_table_list.size = acpi_gbl_root_table_list.count;
200 acpi_gbl_root_table_list.tables = tables;
201 acpi_gbl_root_table_list.flags =
202 ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;
203
204 return_ACPI_STATUS(AE_OK);
205}
206
207/*******************************************************************************
208 *
209 * FUNCTION: acpi_load_table
210 *
211 * PARAMETERS: table_ptr - pointer to a buffer containing the entire
212 * table to be loaded
213 *
214 * RETURN: Status
215 *
216 * DESCRIPTION: This function is called to load a table from the caller's
217 * buffer. The buffer must contain an entire ACPI Table including
218 * a valid header. The header fields will be verified, and if it
219 * is determined that the table is invalid, the call will fail.
220 *
221 ******************************************************************************/
222acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
223{
224 acpi_status status;
225 u32 table_index;
226 struct acpi_table_desc table_desc;
227
228 if (!table_ptr)
229 return AE_BAD_PARAMETER;
230
231 ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
232 table_desc.pointer = table_ptr;
233 table_desc.length = table_ptr->length;
234 table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
235
236 /*
237 * Install the new table into the local data structures
238 */
239 status = acpi_tb_add_table(&table_desc, &table_index);
240 if (ACPI_FAILURE(status)) {
241 return status;
242 }
243 status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
244 return status;
245}
246
247ACPI_EXPORT_SYMBOL(acpi_load_table)
248
249/******************************************************************************
250 *
251 * FUNCTION: acpi_get_table_header
252 *
253 * PARAMETERS: Signature - ACPI signature of needed table
254 * Instance - Which instance (for SSDTs)
255 * out_table_header - The pointer to the table header to fill
256 *
257 * RETURN: Status and pointer to mapped table header
258 *
259 * DESCRIPTION: Finds an ACPI table header.
260 *
261 * NOTE: Caller is responsible in unmapping the header with
262 * acpi_os_unmap_memory
263 *
264 *****************************************************************************/
265acpi_status
266acpi_get_table_header(char *signature,
267 u32 instance, struct acpi_table_header *out_table_header)
268{
269 u32 i;
270 u32 j;
271 struct acpi_table_header *header;
272
273 /* Parameter validation */
274
275 if (!signature || !out_table_header) {
276 return (AE_BAD_PARAMETER);
277 }
278
279 /*
280 * Walk the root table list
281 */
282 for (i = 0, j = 0; i < acpi_gbl_root_table_list.count; i++) {
283 if (!ACPI_COMPARE_NAME
284 (&(acpi_gbl_root_table_list.tables[i].signature),
285 signature)) {
286 continue;
287 }
288
289 if (++j < instance) {
290 continue;
291 }
292
293 if (!acpi_gbl_root_table_list.tables[i].pointer) {
294 if ((acpi_gbl_root_table_list.tables[i].
295 flags & ACPI_TABLE_ORIGIN_MASK) ==
296 ACPI_TABLE_ORIGIN_MAPPED) {
297 header =
298 acpi_os_map_memory(acpi_gbl_root_table_list.
299 tables[i].address,
300 sizeof(struct
301 acpi_table_header));
302 if (!header) {
303 return AE_NO_MEMORY;
304 }
305 ACPI_MEMCPY(out_table_header, header,
306 sizeof(struct acpi_table_header));
307 acpi_os_unmap_memory(header,
308 sizeof(struct
309 acpi_table_header));
310 } else {
311 return AE_NOT_FOUND;
312 }
313 } else {
314 ACPI_MEMCPY(out_table_header,
315 acpi_gbl_root_table_list.tables[i].pointer,
316 sizeof(struct acpi_table_header));
317 }
318 return (AE_OK);
319 }
320
321 return (AE_NOT_FOUND);
322}
323
324ACPI_EXPORT_SYMBOL(acpi_get_table_header)
325
326/******************************************************************************
327 *
328 * FUNCTION: acpi_unload_table_id
329 *
330 * PARAMETERS: id - Owner ID of the table to be removed.
331 *
332 * RETURN: Status
333 *
334 * DESCRIPTION: This routine is used to force the unload of a table (by id)
335 *
336 ******************************************************************************/
337acpi_status acpi_unload_table_id(acpi_owner_id id)
338{
339 int i;
340 acpi_status status = AE_NOT_EXIST;
341
342 ACPI_FUNCTION_TRACE(acpi_unload_table_id);
343
344 /* Find table in the global table list */
345 for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
346 if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
347 continue;
348 }
349 /*
350 * Delete all namespace objects owned by this table. Note that these
351 * objects can appear anywhere in the namespace by virtue of the AML
352 * "Scope" operator. Thus, we need to track ownership by an ID, not
353 * simply a position within the hierarchy
354 */
355 acpi_tb_delete_namespace_by_owner(i);
356 status = acpi_tb_release_owner_id(i);
357 acpi_tb_set_table_loaded_flag(i, FALSE);
358 break;
359 }
360 return_ACPI_STATUS(status);
361}
362
363ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
364
365/*******************************************************************************
366 *
367 * FUNCTION: acpi_get_table
368 *
369 * PARAMETERS: Signature - ACPI signature of needed table
370 * Instance - Which instance (for SSDTs)
371 * out_table - Where the pointer to the table is returned
372 *
373 * RETURN: Status and pointer to table
374 *
375 * DESCRIPTION: Finds and verifies an ACPI table.
376 *
377 *****************************************************************************/
378acpi_status
379acpi_get_table(char *signature,
380 u32 instance, struct acpi_table_header **out_table)
381{
382 u32 i;
383 u32 j;
384 acpi_status status;
385
386 /* Parameter validation */
387
388 if (!signature || !out_table) {
389 return (AE_BAD_PARAMETER);
390 }
391
392 /*
393 * Walk the root table list
394 */
395 for (i = 0, j = 0; i < acpi_gbl_root_table_list.count; i++) {
396 if (!ACPI_COMPARE_NAME
397 (&(acpi_gbl_root_table_list.tables[i].signature),
398 signature)) {
399 continue;
400 }
401
402 if (++j < instance) {
403 continue;
404 }
405
406 status =
407 acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
408 if (ACPI_SUCCESS(status)) {
409 *out_table = acpi_gbl_root_table_list.tables[i].pointer;
410 }
411
412 if (!acpi_gbl_permanent_mmap) {
413 acpi_gbl_root_table_list.tables[i].pointer = NULL;
414 }
415
416 return (status);
417 }
418
419 return (AE_NOT_FOUND);
420}
421
422ACPI_EXPORT_SYMBOL(acpi_get_table)
423
424/*******************************************************************************
425 *
426 * FUNCTION: acpi_get_table_by_index
427 *
428 * PARAMETERS: table_index - Table index
429 * Table - Where the pointer to the table is returned
430 *
431 * RETURN: Status and pointer to the table
432 *
433 * DESCRIPTION: Obtain a table by an index into the global table list.
434 *
435 ******************************************************************************/
436acpi_status
437acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
438{
439 acpi_status status;
440
441 ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
442
443 /* Parameter validation */
444
445 if (!table) {
446 return_ACPI_STATUS(AE_BAD_PARAMETER);
447 }
448
449 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
450
451 /* Validate index */
452
453 if (table_index >= acpi_gbl_root_table_list.count) {
454 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
455 return_ACPI_STATUS(AE_BAD_PARAMETER);
456 }
457
458 if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
459
460 /* Table is not mapped, map it */
461
462 status =
463 acpi_tb_verify_table(&acpi_gbl_root_table_list.
464 tables[table_index]);
465 if (ACPI_FAILURE(status)) {
466 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
467 return_ACPI_STATUS(status);
468 }
469 }
470
471 *table = acpi_gbl_root_table_list.tables[table_index].pointer;
472 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
473 return_ACPI_STATUS(AE_OK);
474}
475
476ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
477
478/*******************************************************************************
479 *
480 * FUNCTION: acpi_tb_load_namespace
481 *
482 * PARAMETERS: None
483 *
484 * RETURN: Status
485 *
486 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
487 * the RSDT/XSDT.
488 *
489 ******************************************************************************/
490static acpi_status acpi_tb_load_namespace(void)
491{
492 acpi_status status;
493 struct acpi_table_header *table;
494 u32 i;
495
496 ACPI_FUNCTION_TRACE(tb_load_namespace);
497
498 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
499
500 /*
501 * Load the namespace. The DSDT is required, but any SSDT and PSDT tables
502 * are optional.
503 */
504 if (!acpi_gbl_root_table_list.count ||
505 !ACPI_COMPARE_NAME(&
506 (acpi_gbl_root_table_list.
507 tables[ACPI_TABLE_INDEX_DSDT].signature),
508 ACPI_SIG_DSDT)
509 ||
510 ACPI_FAILURE(acpi_tb_verify_table
511 (&acpi_gbl_root_table_list.
512 tables[ACPI_TABLE_INDEX_DSDT]))) {
513 status = AE_NO_ACPI_TABLES;
514 goto unlock_and_exit;
515 }
516
517 /*
518 * Find DSDT table
519 */
520 status =
521 acpi_os_table_override(acpi_gbl_root_table_list.
522 tables[ACPI_TABLE_INDEX_DSDT].pointer,
523 &table);
524 if (ACPI_SUCCESS(status) && table) {
525 /*
526 * DSDT table has been found
527 */
528 acpi_tb_delete_table(&acpi_gbl_root_table_list.
529 tables[ACPI_TABLE_INDEX_DSDT]);
530 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer =
531 table;
532 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].length =
533 table->length;
534 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].flags =
535 ACPI_TABLE_ORIGIN_UNKNOWN;
536
537 ACPI_INFO((AE_INFO, "Table DSDT replaced by host OS"));
538 acpi_tb_print_table_header(0, table);
539
540 if (no_auto_ssdt == 0) {
541 printk(KERN_WARNING "ACPI: DSDT override uses original SSDTs unless \"acpi_no_auto_ssdt\"\n");
542 }
543 }
544
545 status =
546 acpi_tb_verify_table(&acpi_gbl_root_table_list.
547 tables[ACPI_TABLE_INDEX_DSDT]);
548 if (ACPI_FAILURE(status)) {
549
550 /* A valid DSDT is required */
551
552 status = AE_NO_ACPI_TABLES;
553 goto unlock_and_exit;
554 }
555
556 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
557
558 /*
559 * Load and parse tables.
560 */
561 status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
562 if (ACPI_FAILURE(status)) {
563 return_ACPI_STATUS(status);
564 }
565
566 /*
567 * Load any SSDT or PSDT tables. Note: Loop leaves tables locked
568 */
569 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
570 for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
571 if ((!ACPI_COMPARE_NAME
572 (&(acpi_gbl_root_table_list.tables[i].signature),
573 ACPI_SIG_SSDT)
574 &&
575 !ACPI_COMPARE_NAME(&
576 (acpi_gbl_root_table_list.tables[i].
577 signature), ACPI_SIG_PSDT))
578 ||
579 ACPI_FAILURE(acpi_tb_verify_table
580 (&acpi_gbl_root_table_list.tables[i]))) {
581 continue;
582 }
583
584 if (no_auto_ssdt) {
585 printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
586 continue;
587 }
588
589 /* Ignore errors while loading tables, get as many as possible */
590
591 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
592 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
593 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
594 }
595
596 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
597
598 unlock_and_exit:
599 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
600 return_ACPI_STATUS(status);
601}
602
603/*******************************************************************************
604 *
605 * FUNCTION: acpi_load_tables
606 *
607 * PARAMETERS: None
608 *
609 * RETURN: Status
610 *
611 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
612 *
613 ******************************************************************************/
614
615acpi_status acpi_load_tables(void)
616{
617 acpi_status status;
618
619 ACPI_FUNCTION_TRACE(acpi_load_tables);
620
621 /*
622 * Load the namespace from the tables
623 */
624 status = acpi_tb_load_namespace();
625 if (ACPI_FAILURE(status)) {
626 ACPI_EXCEPTION((AE_INFO, status,
627 "While loading namespace from ACPI tables"));
628 }
629
630 return_ACPI_STATUS(status);
631}
632
633ACPI_EXPORT_SYMBOL(acpi_load_tables)
634
635
636/*******************************************************************************
637 *
638 * FUNCTION: acpi_install_table_handler
639 *
640 * PARAMETERS: Handler - Table event handler
641 * Context - Value passed to the handler on each event
642 *
643 * RETURN: Status
644 *
645 * DESCRIPTION: Install table event handler
646 *
647 ******************************************************************************/
648acpi_status
649acpi_install_table_handler(acpi_tbl_handler handler, void *context)
650{
651 acpi_status status;
652
653 ACPI_FUNCTION_TRACE(acpi_install_table_handler);
654
655 if (!handler) {
656 return_ACPI_STATUS(AE_BAD_PARAMETER);
657 }
658
659 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
660 if (ACPI_FAILURE(status)) {
661 return_ACPI_STATUS(status);
662 }
663
664 /* Don't allow more than one handler */
665
666 if (acpi_gbl_table_handler) {
667 status = AE_ALREADY_EXISTS;
668 goto cleanup;
669 }
670
671 /* Install the handler */
672
673 acpi_gbl_table_handler = handler;
674 acpi_gbl_table_handler_context = context;
675
676 cleanup:
677 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
678 return_ACPI_STATUS(status);
679}
680
681ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
682
683/*******************************************************************************
684 *
685 * FUNCTION: acpi_remove_table_handler
686 *
687 * PARAMETERS: Handler - Table event handler that was installed
688 * previously.
689 *
690 * RETURN: Status
691 *
692 * DESCRIPTION: Remove table event handler
693 *
694 ******************************************************************************/
695acpi_status acpi_remove_table_handler(acpi_tbl_handler handler)
696{
697 acpi_status status;
698
699 ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
700
701 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
702 if (ACPI_FAILURE(status)) {
703 return_ACPI_STATUS(status);
704 }
705
706 /* Make sure that the installed handler is the same */
707
708 if (!handler || handler != acpi_gbl_table_handler) {
709 status = AE_BAD_PARAMETER;
710 goto cleanup;
711 }
712
713 /* Remove the handler */
714
715 acpi_gbl_table_handler = NULL;
716
717 cleanup:
718 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
719 return_ACPI_STATUS(status);
720}
721
722ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
723
724
725static int __init acpi_no_auto_ssdt_setup(char *s) {
726
727 printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n");
728
729 no_auto_ssdt = 1;
730
731 return 1;
732}
733
734__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);