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 - 2012, 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 #define __NSREPAIR_C__ 117 118 #include "acpi.h" 119 #include "accommon.h" 120 #include "acnamesp.h" 121 #include "acinterp.h" 122 #include "acpredef.h" 123 124 #define _COMPONENT ACPI_NAMESPACE 125 ACPI_MODULE_NAME ("nsrepair") 126 127 128 /******************************************************************************* 129 * 130 * This module attempts to repair or convert objects returned by the 131 * predefined methods to an object type that is expected, as per the ACPI 132 * specification. The need for this code is dictated by the many machines that 133 * return incorrect types for the standard predefined methods. Performing these 134 * conversions here, in one place, eliminates the need for individual ACPI 135 * device drivers to do the same. Note: Most of these conversions are different 136 * than the internal object conversion routines used for implicit object 137 * conversion. 138 * 139 * The following conversions can be performed as necessary: 140 * 141 * Integer -> String 142 * Integer -> Buffer 143 * String -> Integer 144 * String -> Buffer 145 * Buffer -> Integer 146 * Buffer -> String 147 * Buffer -> Package of Integers 148 * Package -> Package of one Package 149 * An incorrect standalone object is wrapped with required outer package 150 * 151 * Additional possible repairs: 152 * Required package elements that are NULL replaced by Integer/String/Buffer 153 * 154 ******************************************************************************/ 155 156 157 /* Local prototypes */ 158 159 static ACPI_STATUS 160 AcpiNsConvertToInteger ( 161 ACPI_OPERAND_OBJECT *OriginalObject, 162 ACPI_OPERAND_OBJECT **ReturnObject); 163 164 static ACPI_STATUS 165 AcpiNsConvertToString ( 166 ACPI_OPERAND_OBJECT *OriginalObject, 167 ACPI_OPERAND_OBJECT **ReturnObject); 168 169 static ACPI_STATUS 170 AcpiNsConvertToBuffer ( 171 ACPI_OPERAND_OBJECT *OriginalObject, 172 ACPI_OPERAND_OBJECT **ReturnObject); 173 174 175 /******************************************************************************* 176 * 177 * FUNCTION: AcpiNsRepairObject 178 * 179 * PARAMETERS: Data - Pointer to validation data structure 180 * ExpectedBtypes - Object types expected 181 * PackageIndex - Index of object within parent package (if 182 * applicable - ACPI_NOT_PACKAGE_ELEMENT 183 * otherwise) 184 * ReturnObjectPtr - Pointer to the object returned from the 185 * evaluation of a method or object 186 * 187 * RETURN: Status. AE_OK if repair was successful. 188 * 189 * DESCRIPTION: Attempt to repair/convert a return object of a type that was 190 * not expected. 191 * 192 ******************************************************************************/ 193 194 ACPI_STATUS 195 AcpiNsRepairObject ( 196 ACPI_PREDEFINED_DATA *Data, 197 UINT32 ExpectedBtypes, 198 UINT32 PackageIndex, 199 ACPI_OPERAND_OBJECT **ReturnObjectPtr) 200 { 201 ACPI_OPERAND_OBJECT *ReturnObject = *ReturnObjectPtr; 202 ACPI_OPERAND_OBJECT *NewObject; 203 ACPI_STATUS Status; 204 205 206 ACPI_FUNCTION_NAME (NsRepairObject); 207 208 209 /* 210 * At this point, we know that the type of the returned object was not 211 * one of the expected types for this predefined name. Attempt to 212 * repair the object by converting it to one of the expected object 213 * types for this predefined name. 214 */ 215 if (ExpectedBtypes & ACPI_RTYPE_INTEGER) 216 { 217 Status = AcpiNsConvertToInteger (ReturnObject, &NewObject); 218 if (ACPI_SUCCESS (Status)) 219 { 220 goto ObjectRepaired; 221 } 222 } 223 if (ExpectedBtypes & ACPI_RTYPE_STRING) 224 { 225 Status = AcpiNsConvertToString (ReturnObject, &NewObject); 226 if (ACPI_SUCCESS (Status)) 227 { 228 goto ObjectRepaired; 229 } 230 } 231 if (ExpectedBtypes & ACPI_RTYPE_BUFFER) 232 { 233 Status = AcpiNsConvertToBuffer (ReturnObject, &NewObject); 234 if (ACPI_SUCCESS (Status)) 235 { 236 goto ObjectRepaired; 237 } 238 } 239 if (ExpectedBtypes & ACPI_RTYPE_PACKAGE) 240 { 241 /* 242 * A package is expected. We will wrap the existing object with a 243 * new package object. It is often the case that if a variable-length 244 * package is required, but there is only a single object needed, the 245 * BIOS will return that object instead of wrapping it with a Package 246 * object. Note: after the wrapping, the package will be validated 247 * for correct contents (expected object type or types). 248 */ 249 Status = AcpiNsWrapWithPackage (Data, ReturnObject, &NewObject); 250 if (ACPI_SUCCESS (Status)) 251 { 252 /* 253 * The original object just had its reference count 254 * incremented for being inserted into the new package. 255 */ 256 *ReturnObjectPtr = NewObject; /* New Package object */ 257 Data->Flags |= ACPI_OBJECT_REPAIRED; 258 return (AE_OK); 259 } 260 } 261 262 /* We cannot repair this object */ 263 264 return (AE_AML_OPERAND_TYPE); 265 266 267 ObjectRepaired: 268 269 /* Object was successfully repaired */ 270 271 if (PackageIndex != ACPI_NOT_PACKAGE_ELEMENT) 272 { 273 /* 274 * The original object is a package element. We need to 275 * decrement the reference count of the original object, 276 * for removing it from the package. 277 * 278 * However, if the original object was just wrapped with a 279 * package object as part of the repair, we don't need to 280 * change the reference count. 281 */ 282 if (!(Data->Flags & ACPI_OBJECT_WRAPPED)) 283 { 284 NewObject->Common.ReferenceCount = 285 ReturnObject->Common.ReferenceCount; 286 287 if (ReturnObject->Common.ReferenceCount > 1) 288 { 289 ReturnObject->Common.ReferenceCount--; 290 } 291 } 292 293 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR, 294 "%s: Converted %s to expected %s at Package index %u\n", 295 Data->Pathname, AcpiUtGetObjectTypeName (ReturnObject), 296 AcpiUtGetObjectTypeName (NewObject), PackageIndex)); 297 } 298 else 299 { 300 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR, 301 "%s: Converted %s to expected %s\n", 302 Data->Pathname, AcpiUtGetObjectTypeName (ReturnObject), 303 AcpiUtGetObjectTypeName (NewObject))); 304 } 305 306 /* Delete old object, install the new return object */ 307 308 AcpiUtRemoveReference (ReturnObject); 309 *ReturnObjectPtr = NewObject; 310 Data->Flags |= ACPI_OBJECT_REPAIRED; 311 return (AE_OK); 312 } 313 314 315 /******************************************************************************* 316 * 317 * FUNCTION: AcpiNsConvertToInteger 318 * 319 * PARAMETERS: OriginalObject - Object to be converted 320 * ReturnObject - Where the new converted object is returned 321 * 322 * RETURN: Status. AE_OK if conversion was successful. 323 * 324 * DESCRIPTION: Attempt to convert a String/Buffer object to an Integer. 325 * 326 ******************************************************************************/ 327 328 static ACPI_STATUS 329 AcpiNsConvertToInteger ( 330 ACPI_OPERAND_OBJECT *OriginalObject, 331 ACPI_OPERAND_OBJECT **ReturnObject) 332 { 333 ACPI_OPERAND_OBJECT *NewObject; 334 ACPI_STATUS Status; 335 UINT64 Value = 0; 336 UINT32 i; 337 338 339 switch (OriginalObject->Common.Type) 340 { 341 case ACPI_TYPE_STRING: 342 343 /* String-to-Integer conversion */ 344 345 Status = AcpiUtStrtoul64 (OriginalObject->String.Pointer, 346 ACPI_ANY_BASE, &Value); 347 if (ACPI_FAILURE (Status)) 348 { 349 return (Status); 350 } 351 break; 352 353 case ACPI_TYPE_BUFFER: 354 355 /* Buffer-to-Integer conversion. Max buffer size is 64 bits. */ 356 357 if (OriginalObject->Buffer.Length > 8) 358 { 359 return (AE_AML_OPERAND_TYPE); 360 } 361 362 /* Extract each buffer byte to create the integer */ 363 364 for (i = 0; i < OriginalObject->Buffer.Length; i++) 365 { 366 Value |= ((UINT64) OriginalObject->Buffer.Pointer[i] << (i * 8)); 367 } 368 break; 369 370 default: 371 return (AE_AML_OPERAND_TYPE); 372 } 373 374 NewObject = AcpiUtCreateIntegerObject (Value); 375 if (!NewObject) 376 { 377 return (AE_NO_MEMORY); 378 } 379 380 *ReturnObject = NewObject; 381 return (AE_OK); 382 } 383 384 385 /******************************************************************************* 386 * 387 * FUNCTION: AcpiNsConvertToString 388 * 389 * PARAMETERS: OriginalObject - Object to be converted 390 * ReturnObject - Where the new converted object is returned 391 * 392 * RETURN: Status. AE_OK if conversion was successful. 393 * 394 * DESCRIPTION: Attempt to convert a Integer/Buffer object to a String. 395 * 396 ******************************************************************************/ 397 398 static ACPI_STATUS 399 AcpiNsConvertToString ( 400 ACPI_OPERAND_OBJECT *OriginalObject, 401 ACPI_OPERAND_OBJECT **ReturnObject) 402 { 403 ACPI_OPERAND_OBJECT *NewObject; 404 ACPI_SIZE Length; 405 ACPI_STATUS Status; 406 407 408 switch (OriginalObject->Common.Type) 409 { 410 case ACPI_TYPE_INTEGER: 411 /* 412 * Integer-to-String conversion. Commonly, convert 413 * an integer of value 0 to a NULL string. The last element of 414 * _BIF and _BIX packages occasionally need this fix. 415 */ 416 if (OriginalObject->Integer.Value == 0) 417 { 418 /* Allocate a new NULL string object */ 419 420 NewObject = AcpiUtCreateStringObject (0); 421 if (!NewObject) 422 { 423 return (AE_NO_MEMORY); 424 } 425 } 426 else 427 { 428 Status = AcpiExConvertToString (OriginalObject, &NewObject, 429 ACPI_IMPLICIT_CONVERT_HEX); 430 if (ACPI_FAILURE (Status)) 431 { 432 return (Status); 433 } 434 } 435 break; 436 437 case ACPI_TYPE_BUFFER: 438 /* 439 * Buffer-to-String conversion. Use a ToString 440 * conversion, no transform performed on the buffer data. The best 441 * example of this is the _BIF method, where the string data from 442 * the battery is often (incorrectly) returned as buffer object(s). 443 */ 444 Length = 0; 445 while ((Length < OriginalObject->Buffer.Length) && 446 (OriginalObject->Buffer.Pointer[Length])) 447 { 448 Length++; 449 } 450 451 /* Allocate a new string object */ 452 453 NewObject = AcpiUtCreateStringObject (Length); 454 if (!NewObject) 455 { 456 return (AE_NO_MEMORY); 457 } 458 459 /* 460 * Copy the raw buffer data with no transform. String is already NULL 461 * terminated at Length+1. 462 */ 463 ACPI_MEMCPY (NewObject->String.Pointer, 464 OriginalObject->Buffer.Pointer, Length); 465 break; 466 467 default: 468 return (AE_AML_OPERAND_TYPE); 469 } 470 471 *ReturnObject = NewObject; 472 return (AE_OK); 473 } 474 475 476 /******************************************************************************* 477 * 478 * FUNCTION: AcpiNsConvertToBuffer 479 * 480 * PARAMETERS: OriginalObject - Object to be converted 481 * ReturnObject - Where the new converted object is returned 482 * 483 * RETURN: Status. AE_OK if conversion was successful. 484 * 485 * DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer. 486 * 487 ******************************************************************************/ 488 489 static ACPI_STATUS 490 AcpiNsConvertToBuffer ( 491 ACPI_OPERAND_OBJECT *OriginalObject, 492 ACPI_OPERAND_OBJECT **ReturnObject) 493 { 494 ACPI_OPERAND_OBJECT *NewObject; 495 ACPI_STATUS Status; 496 ACPI_OPERAND_OBJECT **Elements; 497 UINT32 *DwordBuffer; 498 UINT32 Count; 499 UINT32 i; 500 501 502 switch (OriginalObject->Common.Type) 503 { 504 case ACPI_TYPE_INTEGER: 505 /* 506 * Integer-to-Buffer conversion. 507 * Convert the Integer to a packed-byte buffer. _MAT and other 508 * objects need this sometimes, if a read has been performed on a 509 * Field object that is less than or equal to the global integer 510 * size (32 or 64 bits). 511 */ 512 Status = AcpiExConvertToBuffer (OriginalObject, &NewObject); 513 if (ACPI_FAILURE (Status)) 514 { 515 return (Status); 516 } 517 break; 518 519 case ACPI_TYPE_STRING: 520 521 /* String-to-Buffer conversion. Simple data copy */ 522 523 NewObject = AcpiUtCreateBufferObject (OriginalObject->String.Length); 524 if (!NewObject) 525 { 526 return (AE_NO_MEMORY); 527 } 528 529 ACPI_MEMCPY (NewObject->Buffer.Pointer, 530 OriginalObject->String.Pointer, OriginalObject->String.Length); 531 break; 532 533 case ACPI_TYPE_PACKAGE: 534 /* 535 * This case is often seen for predefined names that must return a 536 * Buffer object with multiple DWORD integers within. For example, 537 * _FDE and _GTM. The Package can be converted to a Buffer. 538 */ 539 540 /* All elements of the Package must be integers */ 541 542 Elements = OriginalObject->Package.Elements; 543 Count = OriginalObject->Package.Count; 544 545 for (i = 0; i < Count; i++) 546 { 547 if ((!*Elements) || 548 ((*Elements)->Common.Type != ACPI_TYPE_INTEGER)) 549 { 550 return (AE_AML_OPERAND_TYPE); 551 } 552 Elements++; 553 } 554 555 /* Create the new buffer object to replace the Package */ 556 557 NewObject = AcpiUtCreateBufferObject (ACPI_MUL_4 (Count)); 558 if (!NewObject) 559 { 560 return (AE_NO_MEMORY); 561 } 562 563 /* Copy the package elements (integers) to the buffer as DWORDs */ 564 565 Elements = OriginalObject->Package.Elements; 566 DwordBuffer = ACPI_CAST_PTR (UINT32, NewObject->Buffer.Pointer); 567 568 for (i = 0; i < Count; i++) 569 { 570 *DwordBuffer = (UINT32) (*Elements)->Integer.Value; 571 DwordBuffer++; 572 Elements++; 573 } 574 break; 575 576 default: 577 return (AE_AML_OPERAND_TYPE); 578 } 579 580 *ReturnObject = NewObject; 581 return (AE_OK); 582 } 583 584 585 /******************************************************************************* 586 * 587 * FUNCTION: AcpiNsRepairNullElement 588 * 589 * PARAMETERS: Data - Pointer to validation data structure 590 * ExpectedBtypes - Object types expected 591 * PackageIndex - Index of object within parent package (if 592 * applicable - ACPI_NOT_PACKAGE_ELEMENT 593 * otherwise) 594 * ReturnObjectPtr - Pointer to the object returned from the 595 * evaluation of a method or object 596 * 597 * RETURN: Status. AE_OK if repair was successful. 598 * 599 * DESCRIPTION: Attempt to repair a NULL element of a returned Package object. 600 * 601 ******************************************************************************/ 602 603 ACPI_STATUS 604 AcpiNsRepairNullElement ( 605 ACPI_PREDEFINED_DATA *Data, 606 UINT32 ExpectedBtypes, 607 UINT32 PackageIndex, 608 ACPI_OPERAND_OBJECT **ReturnObjectPtr) 609 { 610 ACPI_OPERAND_OBJECT *ReturnObject = *ReturnObjectPtr; 611 ACPI_OPERAND_OBJECT *NewObject; 612 613 614 ACPI_FUNCTION_NAME (NsRepairNullElement); 615 616 617 /* No repair needed if return object is non-NULL */ 618 619 if (ReturnObject) 620 { 621 return (AE_OK); 622 } 623 624 /* 625 * Attempt to repair a NULL element of a Package object. This applies to 626 * predefined names that return a fixed-length package and each element 627 * is required. It does not apply to variable-length packages where NULL 628 * elements are allowed, especially at the end of the package. 629 */ 630 if (ExpectedBtypes & ACPI_RTYPE_INTEGER) 631 { 632 /* Need an Integer - create a zero-value integer */ 633 634 NewObject = AcpiUtCreateIntegerObject ((UINT64) 0); 635 } 636 else if (ExpectedBtypes & ACPI_RTYPE_STRING) 637 { 638 /* Need a String - create a NULL string */ 639 640 NewObject = AcpiUtCreateStringObject (0); 641 } 642 else if (ExpectedBtypes & ACPI_RTYPE_BUFFER) 643 { 644 /* Need a Buffer - create a zero-length buffer */ 645 646 NewObject = AcpiUtCreateBufferObject (0); 647 } 648 else 649 { 650 /* Error for all other expected types */ 651 652 return (AE_AML_OPERAND_TYPE); 653 } 654 655 if (!NewObject) 656 { 657 return (AE_NO_MEMORY); 658 } 659 660 /* Set the reference count according to the parent Package object */ 661 662 NewObject->Common.ReferenceCount = Data->ParentPackage->Common.ReferenceCount; 663 664 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR, 665 "%s: Converted NULL package element to expected %s at index %u\n", 666 Data->Pathname, AcpiUtGetObjectTypeName (NewObject), PackageIndex)); 667 668 *ReturnObjectPtr = NewObject; 669 Data->Flags |= ACPI_OBJECT_REPAIRED; 670 return (AE_OK); 671 } 672 673 674 /****************************************************************************** 675 * 676 * FUNCTION: AcpiNsRemoveNullElements 677 * 678 * PARAMETERS: Data - Pointer to validation data structure 679 * PackageType - An AcpiReturnPackageTypes value 680 * ObjDesc - A Package object 681 * 682 * RETURN: None. 683 * 684 * DESCRIPTION: Remove all NULL package elements from packages that contain 685 * a variable number of sub-packages. For these types of 686 * packages, NULL elements can be safely removed. 687 * 688 *****************************************************************************/ 689 690 void 691 AcpiNsRemoveNullElements ( 692 ACPI_PREDEFINED_DATA *Data, 693 UINT8 PackageType, 694 ACPI_OPERAND_OBJECT *ObjDesc) 695 { 696 ACPI_OPERAND_OBJECT **Source; 697 ACPI_OPERAND_OBJECT **Dest; 698 UINT32 Count; 699 UINT32 NewCount; 700 UINT32 i; 701 702 703 ACPI_FUNCTION_NAME (NsRemoveNullElements); 704 705 706 /* 707 * We can safely remove all NULL elements from these package types: 708 * PTYPE1_VAR packages contain a variable number of simple data types. 709 * PTYPE2 packages contain a variable number of sub-packages. 710 */ 711 switch (PackageType) 712 { 713 case ACPI_PTYPE1_VAR: 714 case ACPI_PTYPE2: 715 case ACPI_PTYPE2_COUNT: 716 case ACPI_PTYPE2_PKG_COUNT: 717 case ACPI_PTYPE2_FIXED: 718 case ACPI_PTYPE2_MIN: 719 case ACPI_PTYPE2_REV_FIXED: 720 case ACPI_PTYPE2_FIX_VAR: 721 break; 722 723 default: 724 case ACPI_PTYPE1_FIXED: 725 case ACPI_PTYPE1_OPTION: 726 return; 727 } 728 729 Count = ObjDesc->Package.Count; 730 NewCount = Count; 731 732 Source = ObjDesc->Package.Elements; 733 Dest = Source; 734 735 /* Examine all elements of the package object, remove nulls */ 736 737 for (i = 0; i < Count; i++) 738 { 739 if (!*Source) 740 { 741 NewCount--; 742 } 743 else 744 { 745 *Dest = *Source; 746 Dest++; 747 } 748 Source++; 749 } 750 751 /* Update parent package if any null elements were removed */ 752 753 if (NewCount < Count) 754 { 755 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR, 756 "%s: Found and removed %u NULL elements\n", 757 Data->Pathname, (Count - NewCount))); 758 759 /* NULL terminate list and update the package count */ 760 761 *Dest = NULL; 762 ObjDesc->Package.Count = NewCount; 763 } 764 } 765 766 767 /******************************************************************************* 768 * 769 * FUNCTION: AcpiNsWrapWithPackage 770 * 771 * PARAMETERS: Data - Pointer to validation data structure 772 * OriginalObject - Pointer to the object to repair. 773 * ObjDescPtr - The new package object is returned here 774 * 775 * RETURN: Status, new object in *ObjDescPtr 776 * 777 * DESCRIPTION: Repair a common problem with objects that are defined to 778 * return a variable-length Package of sub-objects. If there is 779 * only one sub-object, some BIOS code mistakenly simply declares 780 * the single object instead of a Package with one sub-object. 781 * This function attempts to repair this error by wrapping a 782 * Package object around the original object, creating the 783 * correct and expected Package with one sub-object. 784 * 785 * Names that can be repaired in this manner include: 786 * _ALR, _CSD, _HPX, _MLS, _PLD, _PRT, _PSS, _TRT, _TSS, 787 * _BCL, _DOD, _FIX, _Sx 788 * 789 ******************************************************************************/ 790 791 ACPI_STATUS 792 AcpiNsWrapWithPackage ( 793 ACPI_PREDEFINED_DATA *Data, 794 ACPI_OPERAND_OBJECT *OriginalObject, 795 ACPI_OPERAND_OBJECT **ObjDescPtr) 796 { 797 ACPI_OPERAND_OBJECT *PkgObjDesc; 798 799 800 ACPI_FUNCTION_NAME (NsWrapWithPackage); 801 802 803 /* 804 * Create the new outer package and populate it. The new package will 805 * have a single element, the lone sub-object. 806 */ 807 PkgObjDesc = AcpiUtCreatePackageObject (1); 808 if (!PkgObjDesc) 809 { 810 return (AE_NO_MEMORY); 811 } 812 813 PkgObjDesc->Package.Elements[0] = OriginalObject; 814 815 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR, 816 "%s: Wrapped %s with expected Package object\n", 817 Data->Pathname, AcpiUtGetObjectTypeName (OriginalObject))); 818 819 /* Return the new object in the object pointer */ 820 821 *ObjDescPtr = PkgObjDesc; 822 Data->Flags |= ACPI_OBJECT_REPAIRED | ACPI_OBJECT_WRAPPED; 823 return (AE_OK); 824 } 825