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 - 2023, 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
176ACPI_STATUS
177AcpiAllocateRootTable (
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
214ACPI_STATUS ACPI_INIT_FUNCTION
215AcpiInitializeTables (
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 usable format.
267     */
268    Status = AcpiTbParseRootTable (RsdpAddress);
269    return_ACPI_STATUS (Status);
270}
271
272ACPI_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
290ACPI_STATUS ACPI_INIT_FUNCTION
291AcpiReallocateRootTable (
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 initialization 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
362ACPI_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 where the table header
372 *                                    is returned
373 *
374 * RETURN:      Status and a copy of the table header
375 *
376 * DESCRIPTION: Finds and returns an ACPI table header. Caller provides the
377 *              memory where a copy of the header is to be returned
378 *              (fixed length).
379 *
380 ******************************************************************************/
381
382ACPI_STATUS
383AcpiGetTableHeader (
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_NAMESEG (
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
450ACPI_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
473ACPI_STATUS
474AcpiGetTable (
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_NAMESEG (&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
525ACPI_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
544void
545AcpiPutTable (
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
581ACPI_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
598ACPI_STATUS
599AcpiGetTableByIndex (
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
636UnlockAndExit:
637    (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
638    return_ACPI_STATUS (Status);
639}
640
641ACPI_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
657ACPI_STATUS
658AcpiInstallTableHandler (
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
692Cleanup:
693    (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
694    return_ACPI_STATUS (Status);
695}
696
697ACPI_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
713ACPI_STATUS
714AcpiRemoveTableHandler (
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
742Cleanup:
743    (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
744    return_ACPI_STATUS (Status);
745}
746
747ACPI_EXPORT_SYMBOL (AcpiRemoveTableHandler)
748