1 /******************************************************************************
2 *
3 * Module Name: tbxface - ACPI table-oriented external interfaces
4 *
5 *****************************************************************************/
6
7 /******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp.
12 * All rights reserved.
13 *
14 * 2. License
15 *
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
19 * property rights.
20 *
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
27 *
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
53 *
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
64 * make.
65 *
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
74 *
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
79 *
80 * 4. Disclaimer and Export Compliance
81 *
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88 * PARTICULAR PURPOSE.
89 *
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97 * LIMITED REMEDY.
98 *
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
113 *
114 *****************************************************************************
115 *
116 * Alternatively, you may choose to be licensed under the terms of the
117 * following license:
118 *
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
121 * are met:
122 * 1. Redistributions of source code must retain the above copyright
123 * notice, this list of conditions, and the following disclaimer,
124 * without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 * substantially similar to the "NO WARRANTY" disclaimer below
127 * ("Disclaimer") and any redistribution must be conditioned upon
128 * including a substantially similar Disclaimer requirement for further
129 * binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 * of any contributors may be used to endorse or promote products derived
132 * from this software without specific prior written permission.
133 *
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
145 *
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
149 *
150 *****************************************************************************/
151
152 #define EXPORT_ACPI_INTERFACES
153
154 #include "acpi.h"
155 #include "accommon.h"
156 #include "actables.h"
157
158 #define _COMPONENT ACPI_TABLES
159 ACPI_MODULE_NAME ("tbxface")
160
161
162 /*******************************************************************************
163 *
164 * FUNCTION: AcpiAllocateRootTable
165 *
166 * PARAMETERS: InitialTableCount - Size of InitialTableArray, in number of
167 * ACPI_TABLE_DESC structures
168 *
169 * RETURN: Status
170 *
171 * DESCRIPTION: Allocate a root table array. Used by iASL compiler and
172 * AcpiInitializeTables.
173 *
174 ******************************************************************************/
175
176 ACPI_STATUS
AcpiAllocateRootTable(UINT32 InitialTableCount)177 AcpiAllocateRootTable (
178 UINT32 InitialTableCount)
179 {
180
181 AcpiGbl_RootTableList.MaxTableCount = InitialTableCount;
182 AcpiGbl_RootTableList.Flags = ACPI_ROOT_ALLOW_RESIZE;
183
184 return (AcpiTbResizeRootTableList ());
185 }
186
187
188 /*******************************************************************************
189 *
190 * FUNCTION: AcpiInitializeTables
191 *
192 * PARAMETERS: InitialTableArray - Pointer to an array of pre-allocated
193 * ACPI_TABLE_DESC structures. If NULL, the
194 * array is dynamically allocated.
195 * InitialTableCount - Size of InitialTableArray, in number of
196 * ACPI_TABLE_DESC structures
197 * AllowResize - Flag to tell Table Manager if resize of
198 * pre-allocated array is allowed. Ignored
199 * if InitialTableArray is NULL.
200 *
201 * RETURN: Status
202 *
203 * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
204 *
205 * NOTE: Allows static allocation of the initial table array in order
206 * to avoid the use of dynamic memory in confined environments
207 * such as the kernel boot sequence where it may not be available.
208 *
209 * If the host OS memory managers are initialized, use NULL for
210 * InitialTableArray, and the table will be dynamically allocated.
211 *
212 ******************************************************************************/
213
214 ACPI_STATUS ACPI_INIT_FUNCTION
AcpiInitializeTables(ACPI_TABLE_DESC * InitialTableArray,UINT32 InitialTableCount,BOOLEAN AllowResize)215 AcpiInitializeTables (
216 ACPI_TABLE_DESC *InitialTableArray,
217 UINT32 InitialTableCount,
218 BOOLEAN AllowResize)
219 {
220 ACPI_PHYSICAL_ADDRESS RsdpAddress;
221 ACPI_STATUS Status;
222
223
224 ACPI_FUNCTION_TRACE (AcpiInitializeTables);
225
226
227 /*
228 * Setup the Root Table Array and allocate the table array
229 * if requested
230 */
231 if (!InitialTableArray)
232 {
233 Status = AcpiAllocateRootTable (InitialTableCount);
234 if (ACPI_FAILURE (Status))
235 {
236 return_ACPI_STATUS (Status);
237 }
238 }
239 else
240 {
241 /* Root Table Array has been statically allocated by the host */
242
243 memset (InitialTableArray, 0,
244 (ACPI_SIZE) InitialTableCount * sizeof (ACPI_TABLE_DESC));
245
246 AcpiGbl_RootTableList.Tables = InitialTableArray;
247 AcpiGbl_RootTableList.MaxTableCount = InitialTableCount;
248 AcpiGbl_RootTableList.Flags = ACPI_ROOT_ORIGIN_UNKNOWN;
249 if (AllowResize)
250 {
251 AcpiGbl_RootTableList.Flags |= ACPI_ROOT_ALLOW_RESIZE;
252 }
253 }
254
255 /* Get the address of the RSDP */
256
257 RsdpAddress = AcpiOsGetRootPointer ();
258 if (!RsdpAddress)
259 {
260 return_ACPI_STATUS (AE_NOT_FOUND);
261 }
262
263 /*
264 * Get the root table (RSDT or XSDT) and extract all entries to the local
265 * Root Table Array. This array contains the information of the RSDT/XSDT
266 * in a common, more useable format.
267 */
268 Status = AcpiTbParseRootTable (RsdpAddress);
269 return_ACPI_STATUS (Status);
270 }
271
ACPI_EXPORT_SYMBOL_INIT(AcpiInitializeTables)272 ACPI_EXPORT_SYMBOL_INIT (AcpiInitializeTables)
273
274
275 /*******************************************************************************
276 *
277 * FUNCTION: AcpiReallocateRootTable
278 *
279 * PARAMETERS: None
280 *
281 * RETURN: Status
282 *
283 * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
284 * root list from the previously provided scratch area. Should
285 * be called once dynamic memory allocation is available in the
286 * kernel.
287 *
288 ******************************************************************************/
289
290 ACPI_STATUS ACPI_INIT_FUNCTION
291 AcpiReallocateRootTable (
292 void)
293 {
294 ACPI_STATUS Status;
295 ACPI_TABLE_DESC *TableDesc;
296 UINT32 i, j;
297
298
299 ACPI_FUNCTION_TRACE (AcpiReallocateRootTable);
300
301
302 /*
303 * If there are tables unverified, it is required to reallocate the
304 * root table list to clean up invalid table entries. Otherwise only
305 * reallocate the root table list if the host provided a static buffer
306 * for the table array in the call to AcpiInitializeTables().
307 */
308 if ((AcpiGbl_RootTableList.Flags & ACPI_ROOT_ORIGIN_ALLOCATED) &&
309 AcpiGbl_EnableTableValidation)
310 {
311 return_ACPI_STATUS (AE_SUPPORT);
312 }
313
314 (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
315
316 /*
317 * Ensure OS early boot logic, which is required by some hosts. If the
318 * table state is reported to be wrong, developers should fix the
319 * issue by invoking AcpiPutTable() for the reported table during the
320 * early stage.
321 */
322 for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i)
323 {
324 TableDesc = &AcpiGbl_RootTableList.Tables[i];
325 if (TableDesc->Pointer)
326 {
327 ACPI_ERROR ((AE_INFO,
328 "Table [%4.4s] is not invalidated during early boot stage",
329 TableDesc->Signature.Ascii));
330 }
331 }
332
333 if (!AcpiGbl_EnableTableValidation)
334 {
335 /*
336 * Now it's safe to do full table validation. We can do deferred
337 * table initilization here once the flag is set.
338 */
339 AcpiGbl_EnableTableValidation = TRUE;
340 for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i)
341 {
342 TableDesc = &AcpiGbl_RootTableList.Tables[i];
343 if (!(TableDesc->Flags & ACPI_TABLE_IS_VERIFIED))
344 {
345 Status = AcpiTbVerifyTempTable (TableDesc, NULL, &j);
346 if (ACPI_FAILURE (Status))
347 {
348 AcpiTbUninstallTable (TableDesc);
349 }
350 }
351 }
352 }
353
354 AcpiGbl_RootTableList.Flags |= ACPI_ROOT_ALLOW_RESIZE;
355 Status = AcpiTbResizeRootTableList ();
356 AcpiGbl_RootTableList.Flags |= ACPI_ROOT_ORIGIN_ALLOCATED;
357
358 (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
359 return_ACPI_STATUS (Status);
360 }
361
ACPI_EXPORT_SYMBOL_INIT(AcpiReallocateRootTable)362 ACPI_EXPORT_SYMBOL_INIT (AcpiReallocateRootTable)
363
364
365 /*******************************************************************************
366 *
367 * FUNCTION: AcpiGetTableHeader
368 *
369 * PARAMETERS: Signature - ACPI signature of needed table
370 * Instance - Which instance (for SSDTs)
371 * OutTableHeader - The pointer to the table header to fill
372 *
373 * RETURN: Status and pointer to mapped table header
374 *
375 * DESCRIPTION: Finds an ACPI table header.
376 *
377 * NOTE: Caller is responsible in unmapping the header with
378 * AcpiOsUnmapMemory
379 *
380 ******************************************************************************/
381
382 ACPI_STATUS
383 AcpiGetTableHeader (
384 char *Signature,
385 UINT32 Instance,
386 ACPI_TABLE_HEADER *OutTableHeader)
387 {
388 UINT32 i;
389 UINT32 j;
390 ACPI_TABLE_HEADER *Header;
391
392
393 /* Parameter validation */
394
395 if (!Signature || !OutTableHeader)
396 {
397 return (AE_BAD_PARAMETER);
398 }
399
400 /* Walk the root table list */
401
402 for (i = 0, j = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++)
403 {
404 if (!ACPI_COMPARE_NAME (
405 &(AcpiGbl_RootTableList.Tables[i].Signature), Signature))
406 {
407 continue;
408 }
409
410 if (++j < Instance)
411 {
412 continue;
413 }
414
415 if (!AcpiGbl_RootTableList.Tables[i].Pointer)
416 {
417 if ((AcpiGbl_RootTableList.Tables[i].Flags &
418 ACPI_TABLE_ORIGIN_MASK) ==
419 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL)
420 {
421 Header = AcpiOsMapMemory (
422 AcpiGbl_RootTableList.Tables[i].Address,
423 sizeof (ACPI_TABLE_HEADER));
424 if (!Header)
425 {
426 return (AE_NO_MEMORY);
427 }
428
429 memcpy (OutTableHeader, Header, sizeof (ACPI_TABLE_HEADER));
430 AcpiOsUnmapMemory (Header, sizeof (ACPI_TABLE_HEADER));
431 }
432 else
433 {
434 return (AE_NOT_FOUND);
435 }
436 }
437 else
438 {
439 memcpy (OutTableHeader,
440 AcpiGbl_RootTableList.Tables[i].Pointer,
441 sizeof (ACPI_TABLE_HEADER));
442 }
443
444 return (AE_OK);
445 }
446
447 return (AE_NOT_FOUND);
448 }
449
ACPI_EXPORT_SYMBOL(AcpiGetTableHeader)450 ACPI_EXPORT_SYMBOL (AcpiGetTableHeader)
451
452
453 /*******************************************************************************
454 *
455 * FUNCTION: AcpiGetTable
456 *
457 * PARAMETERS: Signature - ACPI signature of needed table
458 * Instance - Which instance (for SSDTs)
459 * OutTable - Where the pointer to the table is returned
460 *
461 * RETURN: Status and pointer to the requested table
462 *
463 * DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
464 * RSDT/XSDT.
465 * Note that an early stage AcpiGetTable() call must be paired
466 * with an early stage AcpiPutTable() call. otherwise the table
467 * pointer mapped by the early stage mapping implementation may be
468 * erroneously unmapped by the late stage unmapping implementation
469 * in an AcpiPutTable() invoked during the late stage.
470 *
471 ******************************************************************************/
472
473 ACPI_STATUS
474 AcpiGetTable (
475 char *Signature,
476 UINT32 Instance,
477 ACPI_TABLE_HEADER **OutTable)
478 {
479 UINT32 i;
480 UINT32 j;
481 ACPI_STATUS Status = AE_NOT_FOUND;
482 ACPI_TABLE_DESC *TableDesc;
483
484
485 /* Parameter validation */
486
487 if (!Signature || !OutTable)
488 {
489 return (AE_BAD_PARAMETER);
490 }
491
492 /*
493 * Note that the following line is required by some OSPMs, they only
494 * check if the returned table is NULL instead of the returned status
495 * to determined if this function is succeeded.
496 */
497 *OutTable = NULL;
498
499 (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
500
501 /* Walk the root table list */
502
503 for (i = 0, j = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++)
504 {
505 TableDesc = &AcpiGbl_RootTableList.Tables[i];
506
507 if (!ACPI_COMPARE_NAME (&TableDesc->Signature, Signature))
508 {
509 continue;
510 }
511
512 if (++j < Instance)
513 {
514 continue;
515 }
516
517 Status = AcpiTbGetTable (TableDesc, OutTable);
518 break;
519 }
520
521 (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
522 return (Status);
523 }
524
ACPI_EXPORT_SYMBOL(AcpiGetTable)525 ACPI_EXPORT_SYMBOL (AcpiGetTable)
526
527
528 /*******************************************************************************
529 *
530 * FUNCTION: AcpiPutTable
531 *
532 * PARAMETERS: Table - The pointer to the table
533 *
534 * RETURN: None
535 *
536 * DESCRIPTION: Release a table returned by AcpiGetTable() and its clones.
537 * Note that it is not safe if this function was invoked after an
538 * uninstallation happened to the original table descriptor.
539 * Currently there is no OSPMs' requirement to handle such
540 * situations.
541 *
542 ******************************************************************************/
543
544 void
545 AcpiPutTable (
546 ACPI_TABLE_HEADER *Table)
547 {
548 UINT32 i;
549 ACPI_TABLE_DESC *TableDesc;
550
551
552 ACPI_FUNCTION_TRACE (AcpiPutTable);
553
554
555 if (!Table)
556 {
557 return_VOID;
558 }
559
560 (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
561
562 /* Walk the root table list */
563
564 for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++)
565 {
566 TableDesc = &AcpiGbl_RootTableList.Tables[i];
567
568 if (TableDesc->Pointer != Table)
569 {
570 continue;
571 }
572
573 AcpiTbPutTable (TableDesc);
574 break;
575 }
576
577 (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
578 return_VOID;
579 }
580
ACPI_EXPORT_SYMBOL(AcpiPutTable)581 ACPI_EXPORT_SYMBOL (AcpiPutTable)
582
583
584 /*******************************************************************************
585 *
586 * FUNCTION: AcpiGetTableByIndex
587 *
588 * PARAMETERS: TableIndex - Table index
589 * OutTable - Where the pointer to the table is returned
590 *
591 * RETURN: Status and pointer to the requested table
592 *
593 * DESCRIPTION: Obtain a table by an index into the global table list. Used
594 * internally also.
595 *
596 ******************************************************************************/
597
598 ACPI_STATUS
599 AcpiGetTableByIndex (
600 UINT32 TableIndex,
601 ACPI_TABLE_HEADER **OutTable)
602 {
603 ACPI_STATUS Status;
604
605
606 ACPI_FUNCTION_TRACE (AcpiGetTableByIndex);
607
608
609 /* Parameter validation */
610
611 if (!OutTable)
612 {
613 return_ACPI_STATUS (AE_BAD_PARAMETER);
614 }
615
616 /*
617 * Note that the following line is required by some OSPMs, they only
618 * check if the returned table is NULL instead of the returned status
619 * to determined if this function is succeeded.
620 */
621 *OutTable = NULL;
622
623 (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
624
625 /* Validate index */
626
627 if (TableIndex >= AcpiGbl_RootTableList.CurrentTableCount)
628 {
629 Status = AE_BAD_PARAMETER;
630 goto UnlockAndExit;
631 }
632
633 Status = AcpiTbGetTable (
634 &AcpiGbl_RootTableList.Tables[TableIndex], OutTable);
635
636 UnlockAndExit:
637 (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
638 return_ACPI_STATUS (Status);
639 }
640
ACPI_EXPORT_SYMBOL(AcpiGetTableByIndex)641 ACPI_EXPORT_SYMBOL (AcpiGetTableByIndex)
642
643
644 /*******************************************************************************
645 *
646 * FUNCTION: AcpiInstallTableHandler
647 *
648 * PARAMETERS: Handler - Table event handler
649 * Context - Value passed to the handler on each event
650 *
651 * RETURN: Status
652 *
653 * DESCRIPTION: Install a global table event handler.
654 *
655 ******************************************************************************/
656
657 ACPI_STATUS
658 AcpiInstallTableHandler (
659 ACPI_TABLE_HANDLER Handler,
660 void *Context)
661 {
662 ACPI_STATUS Status;
663
664
665 ACPI_FUNCTION_TRACE (AcpiInstallTableHandler);
666
667
668 if (!Handler)
669 {
670 return_ACPI_STATUS (AE_BAD_PARAMETER);
671 }
672
673 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
674 if (ACPI_FAILURE (Status))
675 {
676 return_ACPI_STATUS (Status);
677 }
678
679 /* Don't allow more than one handler */
680
681 if (AcpiGbl_TableHandler)
682 {
683 Status = AE_ALREADY_EXISTS;
684 goto Cleanup;
685 }
686
687 /* Install the handler */
688
689 AcpiGbl_TableHandler = Handler;
690 AcpiGbl_TableHandlerContext = Context;
691
692 Cleanup:
693 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
694 return_ACPI_STATUS (Status);
695 }
696
ACPI_EXPORT_SYMBOL(AcpiInstallTableHandler)697 ACPI_EXPORT_SYMBOL (AcpiInstallTableHandler)
698
699
700 /*******************************************************************************
701 *
702 * FUNCTION: AcpiRemoveTableHandler
703 *
704 * PARAMETERS: Handler - Table event handler that was installed
705 * previously.
706 *
707 * RETURN: Status
708 *
709 * DESCRIPTION: Remove a table event handler
710 *
711 ******************************************************************************/
712
713 ACPI_STATUS
714 AcpiRemoveTableHandler (
715 ACPI_TABLE_HANDLER Handler)
716 {
717 ACPI_STATUS Status;
718
719
720 ACPI_FUNCTION_TRACE (AcpiRemoveTableHandler);
721
722
723 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
724 if (ACPI_FAILURE (Status))
725 {
726 return_ACPI_STATUS (Status);
727 }
728
729 /* Make sure that the installed handler is the same */
730
731 if (!Handler ||
732 Handler != AcpiGbl_TableHandler)
733 {
734 Status = AE_BAD_PARAMETER;
735 goto Cleanup;
736 }
737
738 /* Remove the handler */
739
740 AcpiGbl_TableHandler = NULL;
741
742 Cleanup:
743 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
744 return_ACPI_STATUS (Status);
745 }
746
747 ACPI_EXPORT_SYMBOL (AcpiRemoveTableHandler)
748