xref: /freebsd/sys/contrib/dev/acpica/components/namespace/nsrepair.c (revision f126890ac5386406dadf7c4cfa9566cbb56537c5)
1 /******************************************************************************
2  *
3  * Module Name: nsrepair - Repair for objects returned by predefined methods
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 #include <contrib/dev/acpica/include/acpi.h>
153 #include <contrib/dev/acpica/include/accommon.h>
154 #include <contrib/dev/acpica/include/acnamesp.h>
155 #include <contrib/dev/acpica/include/acinterp.h>
156 #include <contrib/dev/acpica/include/acpredef.h>
157 #include <contrib/dev/acpica/include/amlresrc.h>
158 
159 #define _COMPONENT          ACPI_NAMESPACE
160         ACPI_MODULE_NAME    ("nsrepair")
161 
162 
163 /*******************************************************************************
164  *
165  * This module attempts to repair or convert objects returned by the
166  * predefined methods to an object type that is expected, as per the ACPI
167  * specification. The need for this code is dictated by the many machines that
168  * return incorrect types for the standard predefined methods. Performing these
169  * conversions here, in one place, eliminates the need for individual ACPI
170  * device drivers to do the same. Note: Most of these conversions are different
171  * than the internal object conversion routines used for implicit object
172  * conversion.
173  *
174  * The following conversions can be performed as necessary:
175  *
176  * Integer -> String
177  * Integer -> Buffer
178  * String  -> Integer
179  * String  -> Buffer
180  * Buffer  -> Integer
181  * Buffer  -> String
182  * Buffer  -> Package of Integers
183  * Package -> Package of one Package
184  *
185  * Additional conversions that are available:
186  *  Convert a null return or zero return value to an EndTag descriptor
187  *  Convert an ASCII string to a Unicode buffer
188  *
189  * An incorrect standalone object is wrapped with required outer package
190  *
191  * Additional possible repairs:
192  * Required package elements that are NULL replaced by Integer/String/Buffer
193  *
194  ******************************************************************************/
195 
196 
197 /* Local prototypes */
198 
199 static const ACPI_SIMPLE_REPAIR_INFO *
200 AcpiNsMatchSimpleRepair (
201     ACPI_NAMESPACE_NODE     *Node,
202     UINT32                  ReturnBtype,
203     UINT32                  PackageIndex);
204 
205 
206 /*
207  * Special but simple repairs for some names.
208  *
209  * 2nd argument: Unexpected types that can be repaired
210  */
211 static const ACPI_SIMPLE_REPAIR_INFO    AcpiObjectRepairInfo[] =
212 {
213     /* Resource descriptor conversions */
214 
215     { "_CRS", ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER | ACPI_RTYPE_NONE,
216                 ACPI_NOT_PACKAGE_ELEMENT,
217                 AcpiNsConvertToResource },
218     { "_DMA", ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER | ACPI_RTYPE_NONE,
219                 ACPI_NOT_PACKAGE_ELEMENT,
220                 AcpiNsConvertToResource },
221     { "_PRS", ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER | ACPI_RTYPE_NONE,
222                 ACPI_NOT_PACKAGE_ELEMENT,
223                 AcpiNsConvertToResource },
224 
225     /* Object reference conversions */
226 
227     { "_DEP", ACPI_RTYPE_STRING, ACPI_ALL_PACKAGE_ELEMENTS,
228                 AcpiNsConvertToReference },
229 
230     /* Unicode conversions */
231 
232     { "_MLS", ACPI_RTYPE_STRING, 1,
233                 AcpiNsConvertToUnicode },
234     { "_STR", ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER,
235                 ACPI_NOT_PACKAGE_ELEMENT,
236                 AcpiNsConvertToUnicode },
237     { {0,0,0,0}, 0, 0, NULL } /* Table terminator */
238 };
239 
240 
241 /*******************************************************************************
242  *
243  * FUNCTION:    AcpiNsSimpleRepair
244  *
245  * PARAMETERS:  Info                - Method execution information block
246  *              ExpectedBtypes      - Object types expected
247  *              PackageIndex        - Index of object within parent package (if
248  *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
249  *                                    otherwise)
250  *              ReturnObjectPtr     - Pointer to the object returned from the
251  *                                    evaluation of a method or object
252  *
253  * RETURN:      Status. AE_OK if repair was successful.
254  *
255  * DESCRIPTION: Attempt to repair/convert a return object of a type that was
256  *              not expected.
257  *
258  ******************************************************************************/
259 
260 ACPI_STATUS
261 AcpiNsSimpleRepair (
262     ACPI_EVALUATE_INFO      *Info,
263     UINT32                  ExpectedBtypes,
264     UINT32                  PackageIndex,
265     ACPI_OPERAND_OBJECT     **ReturnObjectPtr)
266 {
267     ACPI_OPERAND_OBJECT     *ReturnObject = *ReturnObjectPtr;
268     ACPI_OPERAND_OBJECT     *NewObject = NULL;
269     ACPI_STATUS             Status;
270     const ACPI_SIMPLE_REPAIR_INFO   *Predefined;
271 
272 
273     ACPI_FUNCTION_NAME (NsSimpleRepair);
274 
275 
276     /*
277      * Special repairs for certain names that are in the repair table.
278      * Check if this name is in the list of repairable names.
279      */
280     Predefined = AcpiNsMatchSimpleRepair (Info->Node,
281         Info->ReturnBtype, PackageIndex);
282     if (Predefined)
283     {
284         if (!ReturnObject)
285         {
286             ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname,
287                 ACPI_WARN_ALWAYS, "Missing expected return value"));
288         }
289 
290         Status = Predefined->ObjectConverter (Info->Node, ReturnObject,
291             &NewObject);
292         if (ACPI_FAILURE (Status))
293         {
294             /* A fatal error occurred during a conversion */
295 
296             ACPI_EXCEPTION ((AE_INFO, Status,
297                 "During return object analysis"));
298             return (Status);
299         }
300         if (NewObject)
301         {
302             goto ObjectRepaired;
303         }
304     }
305 
306     /*
307      * Do not perform simple object repair unless the return type is not
308      * expected.
309      */
310     if (Info->ReturnBtype & ExpectedBtypes)
311     {
312         return (AE_OK);
313     }
314 
315     /*
316      * At this point, we know that the type of the returned object was not
317      * one of the expected types for this predefined name. Attempt to
318      * repair the object by converting it to one of the expected object
319      * types for this predefined name.
320      */
321 
322     /*
323      * If there is no return value, check if we require a return value for
324      * this predefined name. Either one return value is expected, or none,
325      * for both methods and other objects.
326      *
327      * Try to fix if there was no return object. Warning if failed to fix.
328      */
329     if (!ReturnObject)
330     {
331         if (ExpectedBtypes)
332         {
333             if (!(ExpectedBtypes & ACPI_RTYPE_NONE) &&
334                 PackageIndex != ACPI_NOT_PACKAGE_ELEMENT)
335             {
336                 ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname,
337                     ACPI_WARN_ALWAYS, "Found unexpected NULL package element"));
338 
339                 Status = AcpiNsRepairNullElement (Info, ExpectedBtypes,
340                     PackageIndex, ReturnObjectPtr);
341                 if (ACPI_SUCCESS (Status))
342                 {
343                     return (AE_OK); /* Repair was successful */
344                 }
345             }
346 
347             if (ExpectedBtypes != ACPI_RTYPE_NONE)
348             {
349                 ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname,
350                                        ACPI_WARN_ALWAYS,
351                                        "Missing expected return value"));
352                 return (AE_AML_NO_RETURN_VALUE);
353             }
354         }
355     }
356 
357     if (ExpectedBtypes & ACPI_RTYPE_INTEGER)
358     {
359         Status = AcpiNsConvertToInteger (ReturnObject, &NewObject);
360         if (ACPI_SUCCESS (Status))
361         {
362             goto ObjectRepaired;
363         }
364     }
365     if (ExpectedBtypes & ACPI_RTYPE_STRING)
366     {
367         Status = AcpiNsConvertToString (ReturnObject, &NewObject);
368         if (ACPI_SUCCESS (Status))
369         {
370             goto ObjectRepaired;
371         }
372     }
373     if (ExpectedBtypes & ACPI_RTYPE_BUFFER)
374     {
375         Status = AcpiNsConvertToBuffer (ReturnObject, &NewObject);
376         if (ACPI_SUCCESS (Status))
377         {
378             goto ObjectRepaired;
379         }
380     }
381     if (ExpectedBtypes & ACPI_RTYPE_PACKAGE)
382     {
383         /*
384          * A package is expected. We will wrap the existing object with a
385          * new package object. It is often the case that if a variable-length
386          * package is required, but there is only a single object needed, the
387          * BIOS will return that object instead of wrapping it with a Package
388          * object. Note: after the wrapping, the package will be validated
389          * for correct contents (expected object type or types).
390          */
391         Status = AcpiNsWrapWithPackage (Info, ReturnObject, &NewObject);
392         if (ACPI_SUCCESS (Status))
393         {
394             /*
395              * The original object just had its reference count
396              * incremented for being inserted into the new package.
397              */
398             *ReturnObjectPtr = NewObject;       /* New Package object */
399             Info->ReturnFlags |= ACPI_OBJECT_REPAIRED;
400             return (AE_OK);
401         }
402     }
403 
404     /* We cannot repair this object */
405 
406     return (AE_AML_OPERAND_TYPE);
407 
408 
409 ObjectRepaired:
410 
411     /* Object was successfully repaired */
412 
413     if (PackageIndex != ACPI_NOT_PACKAGE_ELEMENT)
414     {
415         /* Update reference count of new object */
416 
417         if (!(Info->ReturnFlags & ACPI_OBJECT_WRAPPED))
418         {
419             NewObject->Common.ReferenceCount =
420                 ReturnObject->Common.ReferenceCount;
421         }
422 
423         ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
424             "%s: Converted %s to expected %s at Package index %u\n",
425             Info->FullPathname, AcpiUtGetObjectTypeName (ReturnObject),
426             AcpiUtGetObjectTypeName (NewObject), PackageIndex));
427     }
428     else
429     {
430         ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
431             "%s: Converted %s to expected %s\n",
432             Info->FullPathname, AcpiUtGetObjectTypeName (ReturnObject),
433             AcpiUtGetObjectTypeName (NewObject)));
434     }
435 
436     /* Delete old object, install the new return object */
437 
438     AcpiUtRemoveReference (ReturnObject);
439     *ReturnObjectPtr = NewObject;
440     Info->ReturnFlags |= ACPI_OBJECT_REPAIRED;
441     return (AE_OK);
442 }
443 
444 
445 /******************************************************************************
446  *
447  * FUNCTION:    AcpiNsMatchSimpleRepair
448  *
449  * PARAMETERS:  Node                - Namespace node for the method/object
450  *              ReturnBtype         - Object type that was returned
451  *              PackageIndex        - Index of object within parent package (if
452  *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
453  *                                    otherwise)
454  *
455  * RETURN:      Pointer to entry in repair table. NULL indicates not found.
456  *
457  * DESCRIPTION: Check an object name against the repairable object list.
458  *
459  *****************************************************************************/
460 
461 static const ACPI_SIMPLE_REPAIR_INFO *
462 AcpiNsMatchSimpleRepair (
463     ACPI_NAMESPACE_NODE     *Node,
464     UINT32                  ReturnBtype,
465     UINT32                  PackageIndex)
466 {
467     const ACPI_SIMPLE_REPAIR_INFO   *ThisName;
468 
469 
470     /* Search info table for a repairable predefined method/object name */
471 
472     ThisName = AcpiObjectRepairInfo;
473     while (ThisName->ObjectConverter)
474     {
475         if (ACPI_COMPARE_NAMESEG (Node->Name.Ascii, ThisName->Name))
476         {
477             /* Check if we can actually repair this name/type combination */
478 
479             if ((ReturnBtype & ThisName->UnexpectedBtypes) &&
480                 (ThisName->PackageIndex == ACPI_ALL_PACKAGE_ELEMENTS ||
481                  PackageIndex == ThisName->PackageIndex))
482             {
483                 return (ThisName);
484             }
485 
486             return (NULL);
487         }
488 
489         ThisName++;
490     }
491 
492     return (NULL); /* Name was not found in the repair table */
493 }
494 
495 
496 /*******************************************************************************
497  *
498  * FUNCTION:    AcpiNsRepairNullElement
499  *
500  * PARAMETERS:  Info                - Method execution information block
501  *              ExpectedBtypes      - Object types expected
502  *              PackageIndex        - Index of object within parent package (if
503  *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
504  *                                    otherwise)
505  *              ReturnObjectPtr     - Pointer to the object returned from the
506  *                                    evaluation of a method or object
507  *
508  * RETURN:      Status. AE_OK if repair was successful.
509  *
510  * DESCRIPTION: Attempt to repair a NULL element of a returned Package object.
511  *
512  ******************************************************************************/
513 
514 ACPI_STATUS
515 AcpiNsRepairNullElement (
516     ACPI_EVALUATE_INFO      *Info,
517     UINT32                  ExpectedBtypes,
518     UINT32                  PackageIndex,
519     ACPI_OPERAND_OBJECT     **ReturnObjectPtr)
520 {
521     ACPI_OPERAND_OBJECT     *ReturnObject = *ReturnObjectPtr;
522     ACPI_OPERAND_OBJECT     *NewObject;
523 
524 
525     ACPI_FUNCTION_NAME (NsRepairNullElement);
526 
527 
528     /* No repair needed if return object is non-NULL */
529 
530     if (ReturnObject)
531     {
532         return (AE_OK);
533     }
534 
535     /*
536      * Attempt to repair a NULL element of a Package object. This applies to
537      * predefined names that return a fixed-length package and each element
538      * is required. It does not apply to variable-length packages where NULL
539      * elements are allowed, especially at the end of the package.
540      */
541     if (ExpectedBtypes & ACPI_RTYPE_INTEGER)
542     {
543         /* Need an Integer - create a zero-value integer */
544 
545         NewObject = AcpiUtCreateIntegerObject ((UINT64) 0);
546     }
547     else if (ExpectedBtypes & ACPI_RTYPE_STRING)
548     {
549         /* Need a String - create a NULL string */
550 
551         NewObject = AcpiUtCreateStringObject (0);
552     }
553     else if (ExpectedBtypes & ACPI_RTYPE_BUFFER)
554     {
555         /* Need a Buffer - create a zero-length buffer */
556 
557         NewObject = AcpiUtCreateBufferObject (0);
558     }
559     else
560     {
561         /* Error for all other expected types */
562 
563         return (AE_AML_OPERAND_TYPE);
564     }
565 
566     if (!NewObject)
567     {
568         return (AE_NO_MEMORY);
569     }
570 
571     /* Set the reference count according to the parent Package object */
572 
573     NewObject->Common.ReferenceCount =
574         Info->ParentPackage->Common.ReferenceCount;
575 
576     ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
577         "%s: Converted NULL package element to expected %s at index %u\n",
578         Info->FullPathname, AcpiUtGetObjectTypeName (NewObject),
579         PackageIndex));
580 
581     *ReturnObjectPtr = NewObject;
582     Info->ReturnFlags |= ACPI_OBJECT_REPAIRED;
583     return (AE_OK);
584 }
585 
586 
587 /******************************************************************************
588  *
589  * FUNCTION:    AcpiNsRemoveNullElements
590  *
591  * PARAMETERS:  Info                - Method execution information block
592  *              PackageType         - An AcpiReturnPackageTypes value
593  *              ObjDesc             - A Package object
594  *
595  * RETURN:      None.
596  *
597  * DESCRIPTION: Remove all NULL package elements from packages that contain
598  *              a variable number of subpackages. For these types of
599  *              packages, NULL elements can be safely removed.
600  *
601  *****************************************************************************/
602 
603 void
604 AcpiNsRemoveNullElements (
605     ACPI_EVALUATE_INFO      *Info,
606     UINT8                   PackageType,
607     ACPI_OPERAND_OBJECT     *ObjDesc)
608 {
609     ACPI_OPERAND_OBJECT     **Source;
610     ACPI_OPERAND_OBJECT     **Dest;
611     UINT32                  Count;
612     UINT32                  NewCount;
613     UINT32                  i;
614 
615 
616     ACPI_FUNCTION_NAME (NsRemoveNullElements);
617 
618 
619     /*
620      * We can safely remove all NULL elements from these package types:
621      * PTYPE1_VAR packages contain a variable number of simple data types.
622      * PTYPE2 packages contain a variable number of subpackages.
623      */
624     switch (PackageType)
625     {
626     case ACPI_PTYPE1_VAR:
627     case ACPI_PTYPE2:
628     case ACPI_PTYPE2_COUNT:
629     case ACPI_PTYPE2_PKG_COUNT:
630     case ACPI_PTYPE2_FIXED:
631     case ACPI_PTYPE2_MIN:
632     case ACPI_PTYPE2_REV_FIXED:
633     case ACPI_PTYPE2_FIX_VAR:
634         break;
635 
636     default:
637     case ACPI_PTYPE2_VAR_VAR:
638     case ACPI_PTYPE1_FIXED:
639     case ACPI_PTYPE1_OPTION:
640         return;
641     }
642 
643     Count = ObjDesc->Package.Count;
644     NewCount = Count;
645 
646     Source = ObjDesc->Package.Elements;
647     Dest = Source;
648 
649     /* Examine all elements of the package object, remove nulls */
650 
651     for (i = 0; i < Count; i++)
652     {
653         if (!*Source)
654         {
655             NewCount--;
656         }
657         else
658         {
659             *Dest = *Source;
660             Dest++;
661         }
662 
663         Source++;
664     }
665 
666     /* Update parent package if any null elements were removed */
667 
668     if (NewCount < Count)
669     {
670         ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
671             "%s: Found and removed %u NULL elements\n",
672             Info->FullPathname, (Count - NewCount)));
673 
674         /* NULL terminate list and update the package count */
675 
676         *Dest = NULL;
677         ObjDesc->Package.Count = NewCount;
678     }
679 }
680 
681 
682 /*******************************************************************************
683  *
684  * FUNCTION:    AcpiNsWrapWithPackage
685  *
686  * PARAMETERS:  Info                - Method execution information block
687  *              OriginalObject      - Pointer to the object to repair.
688  *              ObjDescPtr          - The new package object is returned here
689  *
690  * RETURN:      Status, new object in *ObjDescPtr
691  *
692  * DESCRIPTION: Repair a common problem with objects that are defined to
693  *              return a variable-length Package of sub-objects. If there is
694  *              only one sub-object, some BIOS code mistakenly simply declares
695  *              the single object instead of a Package with one sub-object.
696  *              This function attempts to repair this error by wrapping a
697  *              Package object around the original object, creating the
698  *              correct and expected Package with one sub-object.
699  *
700  *              Names that can be repaired in this manner include:
701  *              _ALR, _CSD, _HPX, _MLS, _PLD, _PRT, _PSS, _TRT, _TSS,
702  *              _BCL, _DOD, _FIX, _Sx
703  *
704  ******************************************************************************/
705 
706 ACPI_STATUS
707 AcpiNsWrapWithPackage (
708     ACPI_EVALUATE_INFO      *Info,
709     ACPI_OPERAND_OBJECT     *OriginalObject,
710     ACPI_OPERAND_OBJECT     **ObjDescPtr)
711 {
712     ACPI_OPERAND_OBJECT     *PkgObjDesc;
713 
714 
715     ACPI_FUNCTION_NAME (NsWrapWithPackage);
716 
717 
718     /*
719      * Create the new outer package and populate it. The new
720      * package will have a single element, the lone sub-object.
721      */
722     PkgObjDesc = AcpiUtCreatePackageObject (1);
723     if (!PkgObjDesc)
724     {
725         return (AE_NO_MEMORY);
726     }
727 
728     PkgObjDesc->Package.Elements[0] = OriginalObject;
729 
730     ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
731         "%s: Wrapped %s with expected Package object\n",
732         Info->FullPathname, AcpiUtGetObjectTypeName (OriginalObject)));
733 
734     /* Return the new object in the object pointer */
735 
736     *ObjDescPtr = PkgObjDesc;
737     Info->ReturnFlags |= ACPI_OBJECT_REPAIRED | ACPI_OBJECT_WRAPPED;
738     return (AE_OK);
739 }
740