1 /******************************************************************************
2 *
3 * Module Name: nsrepair - Repair for objects returned by predefined methods
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2014, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include "acpi.h"
45 #include "accommon.h"
46 #include "acnamesp.h"
47 #include "acinterp.h"
48 #include "acpredef.h"
49 #include "amlresrc.h"
50
51 #define _COMPONENT ACPI_NAMESPACE
52 ACPI_MODULE_NAME ("nsrepair")
53
54
55 /*******************************************************************************
56 *
57 * This module attempts to repair or convert objects returned by the
58 * predefined methods to an object type that is expected, as per the ACPI
59 * specification. The need for this code is dictated by the many machines that
60 * return incorrect types for the standard predefined methods. Performing these
61 * conversions here, in one place, eliminates the need for individual ACPI
62 * device drivers to do the same. Note: Most of these conversions are different
63 * than the internal object conversion routines used for implicit object
64 * conversion.
65 *
66 * The following conversions can be performed as necessary:
67 *
68 * Integer -> String
69 * Integer -> Buffer
70 * String -> Integer
71 * String -> Buffer
72 * Buffer -> Integer
73 * Buffer -> String
74 * Buffer -> Package of Integers
75 * Package -> Package of one Package
76 *
77 * Additional conversions that are available:
78 * Convert a null return or zero return value to an EndTag descriptor
79 * Convert an ASCII string to a Unicode buffer
80 *
81 * An incorrect standalone object is wrapped with required outer package
82 *
83 * Additional possible repairs:
84 * Required package elements that are NULL replaced by Integer/String/Buffer
85 *
86 ******************************************************************************/
87
88
89 /* Local prototypes */
90
91 static const ACPI_SIMPLE_REPAIR_INFO *
92 AcpiNsMatchSimpleRepair (
93 ACPI_NAMESPACE_NODE *Node,
94 UINT32 ReturnBtype,
95 UINT32 PackageIndex);
96
97
98 /*
99 * Special but simple repairs for some names.
100 *
101 * 2nd argument: Unexpected types that can be repaired
102 */
103 static const ACPI_SIMPLE_REPAIR_INFO AcpiObjectRepairInfo[] =
104 {
105 /* Resource descriptor conversions */
106
107 { "_CRS", ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER | ACPI_RTYPE_NONE,
108 ACPI_NOT_PACKAGE_ELEMENT,
109 AcpiNsConvertToResource },
110 { "_DMA", ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER | ACPI_RTYPE_NONE,
111 ACPI_NOT_PACKAGE_ELEMENT,
112 AcpiNsConvertToResource },
113 { "_PRS", ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER | ACPI_RTYPE_NONE,
114 ACPI_NOT_PACKAGE_ELEMENT,
115 AcpiNsConvertToResource },
116
117 /* Unicode conversions */
118
119 { "_MLS", ACPI_RTYPE_STRING, 1,
120 AcpiNsConvertToUnicode },
121 { "_STR", ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER,
122 ACPI_NOT_PACKAGE_ELEMENT,
123 AcpiNsConvertToUnicode },
124 { {0,0,0,0}, 0, 0, NULL } /* Table terminator */
125 };
126
127
128 /*******************************************************************************
129 *
130 * FUNCTION: AcpiNsSimpleRepair
131 *
132 * PARAMETERS: Info - Method execution information block
133 * ExpectedBtypes - Object types expected
134 * PackageIndex - Index of object within parent package (if
135 * applicable - ACPI_NOT_PACKAGE_ELEMENT
136 * otherwise)
137 * ReturnObjectPtr - Pointer to the object returned from the
138 * evaluation of a method or object
139 *
140 * RETURN: Status. AE_OK if repair was successful.
141 *
142 * DESCRIPTION: Attempt to repair/convert a return object of a type that was
143 * not expected.
144 *
145 ******************************************************************************/
146
147 ACPI_STATUS
AcpiNsSimpleRepair(ACPI_EVALUATE_INFO * Info,UINT32 ExpectedBtypes,UINT32 PackageIndex,ACPI_OPERAND_OBJECT ** ReturnObjectPtr)148 AcpiNsSimpleRepair (
149 ACPI_EVALUATE_INFO *Info,
150 UINT32 ExpectedBtypes,
151 UINT32 PackageIndex,
152 ACPI_OPERAND_OBJECT **ReturnObjectPtr)
153 {
154 ACPI_OPERAND_OBJECT *ReturnObject = *ReturnObjectPtr;
155 ACPI_OPERAND_OBJECT *NewObject = NULL;
156 ACPI_STATUS Status;
157 const ACPI_SIMPLE_REPAIR_INFO *Predefined;
158
159
160 ACPI_FUNCTION_NAME (NsSimpleRepair);
161
162
163 /*
164 * Special repairs for certain names that are in the repair table.
165 * Check if this name is in the list of repairable names.
166 */
167 Predefined = AcpiNsMatchSimpleRepair (Info->Node,
168 Info->ReturnBtype, PackageIndex);
169 if (Predefined)
170 {
171 if (!ReturnObject)
172 {
173 ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname,
174 ACPI_WARN_ALWAYS, "Missing expected return value"));
175 }
176
177 Status = Predefined->ObjectConverter (ReturnObject, &NewObject);
178 if (ACPI_FAILURE (Status))
179 {
180 /* A fatal error occurred during a conversion */
181
182 ACPI_EXCEPTION ((AE_INFO, Status,
183 "During return object analysis"));
184 return (Status);
185 }
186 if (NewObject)
187 {
188 goto ObjectRepaired;
189 }
190 }
191
192 /*
193 * Do not perform simple object repair unless the return type is not
194 * expected.
195 */
196 if (Info->ReturnBtype & ExpectedBtypes)
197 {
198 return (AE_OK);
199 }
200
201 /*
202 * At this point, we know that the type of the returned object was not
203 * one of the expected types for this predefined name. Attempt to
204 * repair the object by converting it to one of the expected object
205 * types for this predefined name.
206 */
207
208 /*
209 * If there is no return value, check if we require a return value for
210 * this predefined name. Either one return value is expected, or none,
211 * for both methods and other objects.
212 *
213 * Try to fix if there was no return object. Warning if failed to fix.
214 */
215 if (!ReturnObject)
216 {
217 if (ExpectedBtypes && (!(ExpectedBtypes & ACPI_RTYPE_NONE)))
218 {
219 if (PackageIndex != ACPI_NOT_PACKAGE_ELEMENT)
220 {
221 ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname,
222 ACPI_WARN_ALWAYS, "Found unexpected NULL package element"));
223
224 Status = AcpiNsRepairNullElement (Info, ExpectedBtypes,
225 PackageIndex, ReturnObjectPtr);
226 if (ACPI_SUCCESS (Status))
227 {
228 return (AE_OK); /* Repair was successful */
229 }
230 }
231 else
232 {
233 ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname,
234 ACPI_WARN_ALWAYS, "Missing expected return value"));
235 }
236
237 return (AE_AML_NO_RETURN_VALUE);
238 }
239 }
240
241 if (ExpectedBtypes & ACPI_RTYPE_INTEGER)
242 {
243 Status = AcpiNsConvertToInteger (ReturnObject, &NewObject);
244 if (ACPI_SUCCESS (Status))
245 {
246 goto ObjectRepaired;
247 }
248 }
249 if (ExpectedBtypes & ACPI_RTYPE_STRING)
250 {
251 Status = AcpiNsConvertToString (ReturnObject, &NewObject);
252 if (ACPI_SUCCESS (Status))
253 {
254 goto ObjectRepaired;
255 }
256 }
257 if (ExpectedBtypes & ACPI_RTYPE_BUFFER)
258 {
259 Status = AcpiNsConvertToBuffer (ReturnObject, &NewObject);
260 if (ACPI_SUCCESS (Status))
261 {
262 goto ObjectRepaired;
263 }
264 }
265 if (ExpectedBtypes & ACPI_RTYPE_PACKAGE)
266 {
267 /*
268 * A package is expected. We will wrap the existing object with a
269 * new package object. It is often the case that if a variable-length
270 * package is required, but there is only a single object needed, the
271 * BIOS will return that object instead of wrapping it with a Package
272 * object. Note: after the wrapping, the package will be validated
273 * for correct contents (expected object type or types).
274 */
275 Status = AcpiNsWrapWithPackage (Info, ReturnObject, &NewObject);
276 if (ACPI_SUCCESS (Status))
277 {
278 /*
279 * The original object just had its reference count
280 * incremented for being inserted into the new package.
281 */
282 *ReturnObjectPtr = NewObject; /* New Package object */
283 Info->ReturnFlags |= ACPI_OBJECT_REPAIRED;
284 return (AE_OK);
285 }
286 }
287
288 /* We cannot repair this object */
289
290 return (AE_AML_OPERAND_TYPE);
291
292
293 ObjectRepaired:
294
295 /* Object was successfully repaired */
296
297 if (PackageIndex != ACPI_NOT_PACKAGE_ELEMENT)
298 {
299 /*
300 * The original object is a package element. We need to
301 * decrement the reference count of the original object,
302 * for removing it from the package.
303 *
304 * However, if the original object was just wrapped with a
305 * package object as part of the repair, we don't need to
306 * change the reference count.
307 */
308 if (!(Info->ReturnFlags & ACPI_OBJECT_WRAPPED))
309 {
310 NewObject->Common.ReferenceCount =
311 ReturnObject->Common.ReferenceCount;
312
313 if (ReturnObject->Common.ReferenceCount > 1)
314 {
315 ReturnObject->Common.ReferenceCount--;
316 }
317 }
318
319 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
320 "%s: Converted %s to expected %s at Package index %u\n",
321 Info->FullPathname, AcpiUtGetObjectTypeName (ReturnObject),
322 AcpiUtGetObjectTypeName (NewObject), PackageIndex));
323 }
324 else
325 {
326 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
327 "%s: Converted %s to expected %s\n",
328 Info->FullPathname, AcpiUtGetObjectTypeName (ReturnObject),
329 AcpiUtGetObjectTypeName (NewObject)));
330 }
331
332 /* Delete old object, install the new return object */
333
334 AcpiUtRemoveReference (ReturnObject);
335 *ReturnObjectPtr = NewObject;
336 Info->ReturnFlags |= ACPI_OBJECT_REPAIRED;
337 return (AE_OK);
338 }
339
340
341 /******************************************************************************
342 *
343 * FUNCTION: AcpiNsMatchSimpleRepair
344 *
345 * PARAMETERS: Node - Namespace node for the method/object
346 * ReturnBtype - Object type that was returned
347 * PackageIndex - Index of object within parent package (if
348 * applicable - ACPI_NOT_PACKAGE_ELEMENT
349 * otherwise)
350 *
351 * RETURN: Pointer to entry in repair table. NULL indicates not found.
352 *
353 * DESCRIPTION: Check an object name against the repairable object list.
354 *
355 *****************************************************************************/
356
357 static const ACPI_SIMPLE_REPAIR_INFO *
AcpiNsMatchSimpleRepair(ACPI_NAMESPACE_NODE * Node,UINT32 ReturnBtype,UINT32 PackageIndex)358 AcpiNsMatchSimpleRepair (
359 ACPI_NAMESPACE_NODE *Node,
360 UINT32 ReturnBtype,
361 UINT32 PackageIndex)
362 {
363 const ACPI_SIMPLE_REPAIR_INFO *ThisName;
364
365
366 /* Search info table for a repairable predefined method/object name */
367
368 ThisName = AcpiObjectRepairInfo;
369 while (ThisName->ObjectConverter)
370 {
371 if (ACPI_COMPARE_NAME (Node->Name.Ascii, ThisName->Name))
372 {
373 /* Check if we can actually repair this name/type combination */
374
375 if ((ReturnBtype & ThisName->UnexpectedBtypes) &&
376 (PackageIndex == ThisName->PackageIndex))
377 {
378 return (ThisName);
379 }
380
381 return (NULL);
382 }
383 ThisName++;
384 }
385
386 return (NULL); /* Name was not found in the repair table */
387 }
388
389
390 /*******************************************************************************
391 *
392 * FUNCTION: AcpiNsRepairNullElement
393 *
394 * PARAMETERS: Info - Method execution information block
395 * ExpectedBtypes - Object types expected
396 * PackageIndex - Index of object within parent package (if
397 * applicable - ACPI_NOT_PACKAGE_ELEMENT
398 * otherwise)
399 * ReturnObjectPtr - Pointer to the object returned from the
400 * evaluation of a method or object
401 *
402 * RETURN: Status. AE_OK if repair was successful.
403 *
404 * DESCRIPTION: Attempt to repair a NULL element of a returned Package object.
405 *
406 ******************************************************************************/
407
408 ACPI_STATUS
AcpiNsRepairNullElement(ACPI_EVALUATE_INFO * Info,UINT32 ExpectedBtypes,UINT32 PackageIndex,ACPI_OPERAND_OBJECT ** ReturnObjectPtr)409 AcpiNsRepairNullElement (
410 ACPI_EVALUATE_INFO *Info,
411 UINT32 ExpectedBtypes,
412 UINT32 PackageIndex,
413 ACPI_OPERAND_OBJECT **ReturnObjectPtr)
414 {
415 ACPI_OPERAND_OBJECT *ReturnObject = *ReturnObjectPtr;
416 ACPI_OPERAND_OBJECT *NewObject;
417
418
419 ACPI_FUNCTION_NAME (NsRepairNullElement);
420
421
422 /* No repair needed if return object is non-NULL */
423
424 if (ReturnObject)
425 {
426 return (AE_OK);
427 }
428
429 /*
430 * Attempt to repair a NULL element of a Package object. This applies to
431 * predefined names that return a fixed-length package and each element
432 * is required. It does not apply to variable-length packages where NULL
433 * elements are allowed, especially at the end of the package.
434 */
435 if (ExpectedBtypes & ACPI_RTYPE_INTEGER)
436 {
437 /* Need an Integer - create a zero-value integer */
438
439 NewObject = AcpiUtCreateIntegerObject ((UINT64) 0);
440 }
441 else if (ExpectedBtypes & ACPI_RTYPE_STRING)
442 {
443 /* Need a String - create a NULL string */
444
445 NewObject = AcpiUtCreateStringObject (0);
446 }
447 else if (ExpectedBtypes & ACPI_RTYPE_BUFFER)
448 {
449 /* Need a Buffer - create a zero-length buffer */
450
451 NewObject = AcpiUtCreateBufferObject (0);
452 }
453 else
454 {
455 /* Error for all other expected types */
456
457 return (AE_AML_OPERAND_TYPE);
458 }
459
460 if (!NewObject)
461 {
462 return (AE_NO_MEMORY);
463 }
464
465 /* Set the reference count according to the parent Package object */
466
467 NewObject->Common.ReferenceCount = Info->ParentPackage->Common.ReferenceCount;
468
469 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
470 "%s: Converted NULL package element to expected %s at index %u\n",
471 Info->FullPathname, AcpiUtGetObjectTypeName (NewObject), PackageIndex));
472
473 *ReturnObjectPtr = NewObject;
474 Info->ReturnFlags |= ACPI_OBJECT_REPAIRED;
475 return (AE_OK);
476 }
477
478
479 /******************************************************************************
480 *
481 * FUNCTION: AcpiNsRemoveNullElements
482 *
483 * PARAMETERS: Info - Method execution information block
484 * PackageType - An AcpiReturnPackageTypes value
485 * ObjDesc - A Package object
486 *
487 * RETURN: None.
488 *
489 * DESCRIPTION: Remove all NULL package elements from packages that contain
490 * a variable number of subpackages. For these types of
491 * packages, NULL elements can be safely removed.
492 *
493 *****************************************************************************/
494
495 void
AcpiNsRemoveNullElements(ACPI_EVALUATE_INFO * Info,UINT8 PackageType,ACPI_OPERAND_OBJECT * ObjDesc)496 AcpiNsRemoveNullElements (
497 ACPI_EVALUATE_INFO *Info,
498 UINT8 PackageType,
499 ACPI_OPERAND_OBJECT *ObjDesc)
500 {
501 ACPI_OPERAND_OBJECT **Source;
502 ACPI_OPERAND_OBJECT **Dest;
503 UINT32 Count;
504 UINT32 NewCount;
505 UINT32 i;
506
507
508 ACPI_FUNCTION_NAME (NsRemoveNullElements);
509
510
511 /*
512 * We can safely remove all NULL elements from these package types:
513 * PTYPE1_VAR packages contain a variable number of simple data types.
514 * PTYPE2 packages contain a variable number of subpackages.
515 */
516 switch (PackageType)
517 {
518 case ACPI_PTYPE1_VAR:
519 case ACPI_PTYPE2:
520 case ACPI_PTYPE2_COUNT:
521 case ACPI_PTYPE2_PKG_COUNT:
522 case ACPI_PTYPE2_FIXED:
523 case ACPI_PTYPE2_MIN:
524 case ACPI_PTYPE2_REV_FIXED:
525 case ACPI_PTYPE2_FIX_VAR:
526
527 break;
528
529 default:
530 case ACPI_PTYPE1_FIXED:
531 case ACPI_PTYPE1_OPTION:
532 return;
533 }
534
535 Count = ObjDesc->Package.Count;
536 NewCount = Count;
537
538 Source = ObjDesc->Package.Elements;
539 Dest = Source;
540
541 /* Examine all elements of the package object, remove nulls */
542
543 for (i = 0; i < Count; i++)
544 {
545 if (!*Source)
546 {
547 NewCount--;
548 }
549 else
550 {
551 *Dest = *Source;
552 Dest++;
553 }
554 Source++;
555 }
556
557 /* Update parent package if any null elements were removed */
558
559 if (NewCount < Count)
560 {
561 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
562 "%s: Found and removed %u NULL elements\n",
563 Info->FullPathname, (Count - NewCount)));
564
565 /* NULL terminate list and update the package count */
566
567 *Dest = NULL;
568 ObjDesc->Package.Count = NewCount;
569 }
570 }
571
572
573 /*******************************************************************************
574 *
575 * FUNCTION: AcpiNsWrapWithPackage
576 *
577 * PARAMETERS: Info - Method execution information block
578 * OriginalObject - Pointer to the object to repair.
579 * ObjDescPtr - The new package object is returned here
580 *
581 * RETURN: Status, new object in *ObjDescPtr
582 *
583 * DESCRIPTION: Repair a common problem with objects that are defined to
584 * return a variable-length Package of sub-objects. If there is
585 * only one sub-object, some BIOS code mistakenly simply declares
586 * the single object instead of a Package with one sub-object.
587 * This function attempts to repair this error by wrapping a
588 * Package object around the original object, creating the
589 * correct and expected Package with one sub-object.
590 *
591 * Names that can be repaired in this manner include:
592 * _ALR, _CSD, _HPX, _MLS, _PLD, _PRT, _PSS, _TRT, _TSS,
593 * _BCL, _DOD, _FIX, _Sx
594 *
595 ******************************************************************************/
596
597 ACPI_STATUS
AcpiNsWrapWithPackage(ACPI_EVALUATE_INFO * Info,ACPI_OPERAND_OBJECT * OriginalObject,ACPI_OPERAND_OBJECT ** ObjDescPtr)598 AcpiNsWrapWithPackage (
599 ACPI_EVALUATE_INFO *Info,
600 ACPI_OPERAND_OBJECT *OriginalObject,
601 ACPI_OPERAND_OBJECT **ObjDescPtr)
602 {
603 ACPI_OPERAND_OBJECT *PkgObjDesc;
604
605
606 ACPI_FUNCTION_NAME (NsWrapWithPackage);
607
608
609 /*
610 * Create the new outer package and populate it. The new package will
611 * have a single element, the lone sub-object.
612 */
613 PkgObjDesc = AcpiUtCreatePackageObject (1);
614 if (!PkgObjDesc)
615 {
616 return (AE_NO_MEMORY);
617 }
618
619 PkgObjDesc->Package.Elements[0] = OriginalObject;
620
621 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
622 "%s: Wrapped %s with expected Package object\n",
623 Info->FullPathname, AcpiUtGetObjectTypeName (OriginalObject)));
624
625 /* Return the new object in the object pointer */
626
627 *ObjDescPtr = PkgObjDesc;
628 Info->ReturnFlags |= ACPI_OBJECT_REPAIRED | ACPI_OBJECT_WRAPPED;
629 return (AE_OK);
630 }
631