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 - 2018, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 ***************************************************************************** 115 * 116 * Alternatively, you may choose to be licensed under the terms of the 117 * following license: 118 * 119 * Redistribution and use in source and binary forms, with or without 120 * modification, are permitted provided that the following conditions 121 * are met: 122 * 1. Redistributions of source code must retain the above copyright 123 * notice, this list of conditions, and the following disclaimer, 124 * without modification. 125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 126 * substantially similar to the "NO WARRANTY" disclaimer below 127 * ("Disclaimer") and any redistribution must be conditioned upon 128 * including a substantially similar Disclaimer requirement for further 129 * binary redistribution. 130 * 3. Neither the names of the above-listed copyright holders nor the names 131 * of any contributors may be used to endorse or promote products derived 132 * from this software without specific prior written permission. 133 * 134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145 * 146 * Alternatively, you may choose to be licensed under the terms of the 147 * GNU General Public License ("GPL") version 2 as published by the Free 148 * Software Foundation. 149 * 150 *****************************************************************************/ 151 152 #include "acpi.h" 153 #include "accommon.h" 154 #include "acnamesp.h" 155 #include "acinterp.h" 156 #include "acpredef.h" 157 #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 && (!(ExpectedBtypes & ACPI_RTYPE_NONE))) 332 { 333 if (PackageIndex != ACPI_NOT_PACKAGE_ELEMENT) 334 { 335 ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, 336 ACPI_WARN_ALWAYS, "Found unexpected NULL package element")); 337 338 Status = AcpiNsRepairNullElement (Info, ExpectedBtypes, 339 PackageIndex, ReturnObjectPtr); 340 if (ACPI_SUCCESS (Status)) 341 { 342 return (AE_OK); /* Repair was successful */ 343 } 344 } 345 else 346 { 347 ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, 348 ACPI_WARN_ALWAYS, "Missing expected return value")); 349 } 350 351 return (AE_AML_NO_RETURN_VALUE); 352 } 353 } 354 355 if (ExpectedBtypes & ACPI_RTYPE_INTEGER) 356 { 357 Status = AcpiNsConvertToInteger (ReturnObject, &NewObject); 358 if (ACPI_SUCCESS (Status)) 359 { 360 goto ObjectRepaired; 361 } 362 } 363 if (ExpectedBtypes & ACPI_RTYPE_STRING) 364 { 365 Status = AcpiNsConvertToString (ReturnObject, &NewObject); 366 if (ACPI_SUCCESS (Status)) 367 { 368 goto ObjectRepaired; 369 } 370 } 371 if (ExpectedBtypes & ACPI_RTYPE_BUFFER) 372 { 373 Status = AcpiNsConvertToBuffer (ReturnObject, &NewObject); 374 if (ACPI_SUCCESS (Status)) 375 { 376 goto ObjectRepaired; 377 } 378 } 379 if (ExpectedBtypes & ACPI_RTYPE_PACKAGE) 380 { 381 /* 382 * A package is expected. We will wrap the existing object with a 383 * new package object. It is often the case that if a variable-length 384 * package is required, but there is only a single object needed, the 385 * BIOS will return that object instead of wrapping it with a Package 386 * object. Note: after the wrapping, the package will be validated 387 * for correct contents (expected object type or types). 388 */ 389 Status = AcpiNsWrapWithPackage (Info, ReturnObject, &NewObject); 390 if (ACPI_SUCCESS (Status)) 391 { 392 /* 393 * The original object just had its reference count 394 * incremented for being inserted into the new package. 395 */ 396 *ReturnObjectPtr = NewObject; /* New Package object */ 397 Info->ReturnFlags |= ACPI_OBJECT_REPAIRED; 398 return (AE_OK); 399 } 400 } 401 402 /* We cannot repair this object */ 403 404 return (AE_AML_OPERAND_TYPE); 405 406 407 ObjectRepaired: 408 409 /* Object was successfully repaired */ 410 411 if (PackageIndex != ACPI_NOT_PACKAGE_ELEMENT) 412 { 413 /* Update reference count of new object */ 414 415 if (!(Info->ReturnFlags & ACPI_OBJECT_WRAPPED)) 416 { 417 NewObject->Common.ReferenceCount = 418 ReturnObject->Common.ReferenceCount; 419 } 420 421 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR, 422 "%s: Converted %s to expected %s at Package index %u\n", 423 Info->FullPathname, AcpiUtGetObjectTypeName (ReturnObject), 424 AcpiUtGetObjectTypeName (NewObject), PackageIndex)); 425 } 426 else 427 { 428 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR, 429 "%s: Converted %s to expected %s\n", 430 Info->FullPathname, AcpiUtGetObjectTypeName (ReturnObject), 431 AcpiUtGetObjectTypeName (NewObject))); 432 } 433 434 /* Delete old object, install the new return object */ 435 436 AcpiUtRemoveReference (ReturnObject); 437 *ReturnObjectPtr = NewObject; 438 Info->ReturnFlags |= ACPI_OBJECT_REPAIRED; 439 return (AE_OK); 440 } 441 442 443 /****************************************************************************** 444 * 445 * FUNCTION: AcpiNsMatchSimpleRepair 446 * 447 * PARAMETERS: Node - Namespace node for the method/object 448 * ReturnBtype - Object type that was returned 449 * PackageIndex - Index of object within parent package (if 450 * applicable - ACPI_NOT_PACKAGE_ELEMENT 451 * otherwise) 452 * 453 * RETURN: Pointer to entry in repair table. NULL indicates not found. 454 * 455 * DESCRIPTION: Check an object name against the repairable object list. 456 * 457 *****************************************************************************/ 458 459 static const ACPI_SIMPLE_REPAIR_INFO * 460 AcpiNsMatchSimpleRepair ( 461 ACPI_NAMESPACE_NODE *Node, 462 UINT32 ReturnBtype, 463 UINT32 PackageIndex) 464 { 465 const ACPI_SIMPLE_REPAIR_INFO *ThisName; 466 467 468 /* Search info table for a repairable predefined method/object name */ 469 470 ThisName = AcpiObjectRepairInfo; 471 while (ThisName->ObjectConverter) 472 { 473 if (ACPI_COMPARE_NAME (Node->Name.Ascii, ThisName->Name)) 474 { 475 /* Check if we can actually repair this name/type combination */ 476 477 if ((ReturnBtype & ThisName->UnexpectedBtypes) && 478 (ThisName->PackageIndex == ACPI_ALL_PACKAGE_ELEMENTS || 479 PackageIndex == ThisName->PackageIndex)) 480 { 481 return (ThisName); 482 } 483 484 return (NULL); 485 } 486 487 ThisName++; 488 } 489 490 return (NULL); /* Name was not found in the repair table */ 491 } 492 493 494 /******************************************************************************* 495 * 496 * FUNCTION: AcpiNsRepairNullElement 497 * 498 * PARAMETERS: Info - Method execution information block 499 * ExpectedBtypes - Object types expected 500 * PackageIndex - Index of object within parent package (if 501 * applicable - ACPI_NOT_PACKAGE_ELEMENT 502 * otherwise) 503 * ReturnObjectPtr - Pointer to the object returned from the 504 * evaluation of a method or object 505 * 506 * RETURN: Status. AE_OK if repair was successful. 507 * 508 * DESCRIPTION: Attempt to repair a NULL element of a returned Package object. 509 * 510 ******************************************************************************/ 511 512 ACPI_STATUS 513 AcpiNsRepairNullElement ( 514 ACPI_EVALUATE_INFO *Info, 515 UINT32 ExpectedBtypes, 516 UINT32 PackageIndex, 517 ACPI_OPERAND_OBJECT **ReturnObjectPtr) 518 { 519 ACPI_OPERAND_OBJECT *ReturnObject = *ReturnObjectPtr; 520 ACPI_OPERAND_OBJECT *NewObject; 521 522 523 ACPI_FUNCTION_NAME (NsRepairNullElement); 524 525 526 /* No repair needed if return object is non-NULL */ 527 528 if (ReturnObject) 529 { 530 return (AE_OK); 531 } 532 533 /* 534 * Attempt to repair a NULL element of a Package object. This applies to 535 * predefined names that return a fixed-length package and each element 536 * is required. It does not apply to variable-length packages where NULL 537 * elements are allowed, especially at the end of the package. 538 */ 539 if (ExpectedBtypes & ACPI_RTYPE_INTEGER) 540 { 541 /* Need an Integer - create a zero-value integer */ 542 543 NewObject = AcpiUtCreateIntegerObject ((UINT64) 0); 544 } 545 else if (ExpectedBtypes & ACPI_RTYPE_STRING) 546 { 547 /* Need a String - create a NULL string */ 548 549 NewObject = AcpiUtCreateStringObject (0); 550 } 551 else if (ExpectedBtypes & ACPI_RTYPE_BUFFER) 552 { 553 /* Need a Buffer - create a zero-length buffer */ 554 555 NewObject = AcpiUtCreateBufferObject (0); 556 } 557 else 558 { 559 /* Error for all other expected types */ 560 561 return (AE_AML_OPERAND_TYPE); 562 } 563 564 if (!NewObject) 565 { 566 return (AE_NO_MEMORY); 567 } 568 569 /* Set the reference count according to the parent Package object */ 570 571 NewObject->Common.ReferenceCount = 572 Info->ParentPackage->Common.ReferenceCount; 573 574 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR, 575 "%s: Converted NULL package element to expected %s at index %u\n", 576 Info->FullPathname, AcpiUtGetObjectTypeName (NewObject), 577 PackageIndex)); 578 579 *ReturnObjectPtr = NewObject; 580 Info->ReturnFlags |= ACPI_OBJECT_REPAIRED; 581 return (AE_OK); 582 } 583 584 585 /****************************************************************************** 586 * 587 * FUNCTION: AcpiNsRemoveNullElements 588 * 589 * PARAMETERS: Info - Method execution information block 590 * PackageType - An AcpiReturnPackageTypes value 591 * ObjDesc - A Package object 592 * 593 * RETURN: None. 594 * 595 * DESCRIPTION: Remove all NULL package elements from packages that contain 596 * a variable number of subpackages. For these types of 597 * packages, NULL elements can be safely removed. 598 * 599 *****************************************************************************/ 600 601 void 602 AcpiNsRemoveNullElements ( 603 ACPI_EVALUATE_INFO *Info, 604 UINT8 PackageType, 605 ACPI_OPERAND_OBJECT *ObjDesc) 606 { 607 ACPI_OPERAND_OBJECT **Source; 608 ACPI_OPERAND_OBJECT **Dest; 609 UINT32 Count; 610 UINT32 NewCount; 611 UINT32 i; 612 613 614 ACPI_FUNCTION_NAME (NsRemoveNullElements); 615 616 617 /* 618 * We can safely remove all NULL elements from these package types: 619 * PTYPE1_VAR packages contain a variable number of simple data types. 620 * PTYPE2 packages contain a variable number of subpackages. 621 */ 622 switch (PackageType) 623 { 624 case ACPI_PTYPE1_VAR: 625 case ACPI_PTYPE2: 626 case ACPI_PTYPE2_COUNT: 627 case ACPI_PTYPE2_PKG_COUNT: 628 case ACPI_PTYPE2_FIXED: 629 case ACPI_PTYPE2_MIN: 630 case ACPI_PTYPE2_REV_FIXED: 631 case ACPI_PTYPE2_FIX_VAR: 632 break; 633 634 default: 635 case ACPI_PTYPE2_VAR_VAR: 636 case ACPI_PTYPE1_FIXED: 637 case ACPI_PTYPE1_OPTION: 638 return; 639 } 640 641 Count = ObjDesc->Package.Count; 642 NewCount = Count; 643 644 Source = ObjDesc->Package.Elements; 645 Dest = Source; 646 647 /* Examine all elements of the package object, remove nulls */ 648 649 for (i = 0; i < Count; i++) 650 { 651 if (!*Source) 652 { 653 NewCount--; 654 } 655 else 656 { 657 *Dest = *Source; 658 Dest++; 659 } 660 661 Source++; 662 } 663 664 /* Update parent package if any null elements were removed */ 665 666 if (NewCount < Count) 667 { 668 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR, 669 "%s: Found and removed %u NULL elements\n", 670 Info->FullPathname, (Count - NewCount))); 671 672 /* NULL terminate list and update the package count */ 673 674 *Dest = NULL; 675 ObjDesc->Package.Count = NewCount; 676 } 677 } 678 679 680 /******************************************************************************* 681 * 682 * FUNCTION: AcpiNsWrapWithPackage 683 * 684 * PARAMETERS: Info - Method execution information block 685 * OriginalObject - Pointer to the object to repair. 686 * ObjDescPtr - The new package object is returned here 687 * 688 * RETURN: Status, new object in *ObjDescPtr 689 * 690 * DESCRIPTION: Repair a common problem with objects that are defined to 691 * return a variable-length Package of sub-objects. If there is 692 * only one sub-object, some BIOS code mistakenly simply declares 693 * the single object instead of a Package with one sub-object. 694 * This function attempts to repair this error by wrapping a 695 * Package object around the original object, creating the 696 * correct and expected Package with one sub-object. 697 * 698 * Names that can be repaired in this manner include: 699 * _ALR, _CSD, _HPX, _MLS, _PLD, _PRT, _PSS, _TRT, _TSS, 700 * _BCL, _DOD, _FIX, _Sx 701 * 702 ******************************************************************************/ 703 704 ACPI_STATUS 705 AcpiNsWrapWithPackage ( 706 ACPI_EVALUATE_INFO *Info, 707 ACPI_OPERAND_OBJECT *OriginalObject, 708 ACPI_OPERAND_OBJECT **ObjDescPtr) 709 { 710 ACPI_OPERAND_OBJECT *PkgObjDesc; 711 712 713 ACPI_FUNCTION_NAME (NsWrapWithPackage); 714 715 716 /* 717 * Create the new outer package and populate it. The new 718 * package will have a single element, the lone sub-object. 719 */ 720 PkgObjDesc = AcpiUtCreatePackageObject (1); 721 if (!PkgObjDesc) 722 { 723 return (AE_NO_MEMORY); 724 } 725 726 PkgObjDesc->Package.Elements[0] = OriginalObject; 727 728 ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR, 729 "%s: Wrapped %s with expected Package object\n", 730 Info->FullPathname, AcpiUtGetObjectTypeName (OriginalObject))); 731 732 /* Return the new object in the object pointer */ 733 734 *ObjDescPtr = PkgObjDesc; 735 Info->ReturnFlags |= ACPI_OBJECT_REPAIRED | ACPI_OBJECT_WRAPPED; 736 return (AE_OK); 737 } 738