1 /****************************************************************************** 2 * 3 * Module Name: exoparg2 - AML execution - opcodes with 2 arguments 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2016, 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 #include "acpi.h" 117 #include "accommon.h" 118 #include "acparser.h" 119 #include "acinterp.h" 120 #include "acevents.h" 121 #include "amlcode.h" 122 123 124 #define _COMPONENT ACPI_EXECUTER 125 ACPI_MODULE_NAME ("exoparg2") 126 127 128 /*! 129 * Naming convention for AML interpreter execution routines. 130 * 131 * The routines that begin execution of AML opcodes are named with a common 132 * convention based upon the number of arguments, the number of target operands, 133 * and whether or not a value is returned: 134 * 135 * AcpiExOpcode_xA_yT_zR 136 * 137 * Where: 138 * 139 * xA - ARGUMENTS: The number of arguments (input operands) that are 140 * required for this opcode type (1 through 6 args). 141 * yT - TARGETS: The number of targets (output operands) that are required 142 * for this opcode type (0, 1, or 2 targets). 143 * zR - RETURN VALUE: Indicates whether this opcode type returns a value 144 * as the function return (0 or 1). 145 * 146 * The AcpiExOpcode* functions are called via the Dispatcher component with 147 * fully resolved operands. 148 !*/ 149 150 151 /******************************************************************************* 152 * 153 * FUNCTION: AcpiExOpcode_2A_0T_0R 154 * 155 * PARAMETERS: WalkState - Current walk state 156 * 157 * RETURN: Status 158 * 159 * DESCRIPTION: Execute opcode with two arguments, no target, and no return 160 * value. 161 * 162 * ALLOCATION: Deletes both operands 163 * 164 ******************************************************************************/ 165 166 ACPI_STATUS 167 AcpiExOpcode_2A_0T_0R ( 168 ACPI_WALK_STATE *WalkState) 169 { 170 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0]; 171 ACPI_NAMESPACE_NODE *Node; 172 UINT32 Value; 173 ACPI_STATUS Status = AE_OK; 174 175 176 ACPI_FUNCTION_TRACE_STR (ExOpcode_2A_0T_0R, 177 AcpiPsGetOpcodeName (WalkState->Opcode)); 178 179 180 /* Examine the opcode */ 181 182 switch (WalkState->Opcode) 183 { 184 case AML_NOTIFY_OP: /* Notify (NotifyObject, NotifyValue) */ 185 186 /* The first operand is a namespace node */ 187 188 Node = (ACPI_NAMESPACE_NODE *) Operand[0]; 189 190 /* Second value is the notify value */ 191 192 Value = (UINT32) Operand[1]->Integer.Value; 193 194 /* Are notifies allowed on this object? */ 195 196 if (!AcpiEvIsNotifyObject (Node)) 197 { 198 ACPI_ERROR ((AE_INFO, 199 "Unexpected notify object type [%s]", 200 AcpiUtGetTypeName (Node->Type))); 201 202 Status = AE_AML_OPERAND_TYPE; 203 break; 204 } 205 206 /* 207 * Dispatch the notify to the appropriate handler 208 * NOTE: the request is queued for execution after this method 209 * completes. The notify handlers are NOT invoked synchronously 210 * from this thread -- because handlers may in turn run other 211 * control methods. 212 */ 213 Status = AcpiEvQueueNotifyRequest (Node, Value); 214 break; 215 216 default: 217 218 ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X", 219 WalkState->Opcode)); 220 Status = AE_AML_BAD_OPCODE; 221 } 222 223 return_ACPI_STATUS (Status); 224 } 225 226 227 /******************************************************************************* 228 * 229 * FUNCTION: AcpiExOpcode_2A_2T_1R 230 * 231 * PARAMETERS: WalkState - Current walk state 232 * 233 * RETURN: Status 234 * 235 * DESCRIPTION: Execute a dyadic operator (2 operands) with 2 output targets 236 * and one implicit return value. 237 * 238 ******************************************************************************/ 239 240 ACPI_STATUS 241 AcpiExOpcode_2A_2T_1R ( 242 ACPI_WALK_STATE *WalkState) 243 { 244 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0]; 245 ACPI_OPERAND_OBJECT *ReturnDesc1 = NULL; 246 ACPI_OPERAND_OBJECT *ReturnDesc2 = NULL; 247 ACPI_STATUS Status; 248 249 250 ACPI_FUNCTION_TRACE_STR (ExOpcode_2A_2T_1R, 251 AcpiPsGetOpcodeName (WalkState->Opcode)); 252 253 254 /* Execute the opcode */ 255 256 switch (WalkState->Opcode) 257 { 258 case AML_DIVIDE_OP: 259 260 /* Divide (Dividend, Divisor, RemainderResult QuotientResult) */ 261 262 ReturnDesc1 = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); 263 if (!ReturnDesc1) 264 { 265 Status = AE_NO_MEMORY; 266 goto Cleanup; 267 } 268 269 ReturnDesc2 = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); 270 if (!ReturnDesc2) 271 { 272 Status = AE_NO_MEMORY; 273 goto Cleanup; 274 } 275 276 /* Quotient to ReturnDesc1, remainder to ReturnDesc2 */ 277 278 Status = AcpiUtDivide ( 279 Operand[0]->Integer.Value, 280 Operand[1]->Integer.Value, 281 &ReturnDesc1->Integer.Value, 282 &ReturnDesc2->Integer.Value); 283 if (ACPI_FAILURE (Status)) 284 { 285 goto Cleanup; 286 } 287 break; 288 289 default: 290 291 ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X", 292 WalkState->Opcode)); 293 294 Status = AE_AML_BAD_OPCODE; 295 goto Cleanup; 296 } 297 298 /* Store the results to the target reference operands */ 299 300 Status = AcpiExStore (ReturnDesc2, Operand[2], WalkState); 301 if (ACPI_FAILURE (Status)) 302 { 303 goto Cleanup; 304 } 305 306 Status = AcpiExStore (ReturnDesc1, Operand[3], WalkState); 307 if (ACPI_FAILURE (Status)) 308 { 309 goto Cleanup; 310 } 311 312 Cleanup: 313 /* 314 * Since the remainder is not returned indirectly, remove a reference to 315 * it. Only the quotient is returned indirectly. 316 */ 317 AcpiUtRemoveReference (ReturnDesc2); 318 319 if (ACPI_FAILURE (Status)) 320 { 321 /* Delete the return object */ 322 323 AcpiUtRemoveReference (ReturnDesc1); 324 } 325 326 /* Save return object (the remainder) on success */ 327 328 else 329 { 330 WalkState->ResultObj = ReturnDesc1; 331 } 332 333 return_ACPI_STATUS (Status); 334 } 335 336 337 /******************************************************************************* 338 * 339 * FUNCTION: AcpiExOpcode_2A_1T_1R 340 * 341 * PARAMETERS: WalkState - Current walk state 342 * 343 * RETURN: Status 344 * 345 * DESCRIPTION: Execute opcode with two arguments, one target, and a return 346 * value. 347 * 348 ******************************************************************************/ 349 350 ACPI_STATUS 351 AcpiExOpcode_2A_1T_1R ( 352 ACPI_WALK_STATE *WalkState) 353 { 354 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0]; 355 ACPI_OPERAND_OBJECT *ReturnDesc = NULL; 356 UINT64 Index; 357 ACPI_STATUS Status = AE_OK; 358 ACPI_SIZE Length = 0; 359 360 361 ACPI_FUNCTION_TRACE_STR (ExOpcode_2A_1T_1R, 362 AcpiPsGetOpcodeName (WalkState->Opcode)); 363 364 365 /* Execute the opcode */ 366 367 if (WalkState->OpInfo->Flags & AML_MATH) 368 { 369 /* All simple math opcodes (add, etc.) */ 370 371 ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); 372 if (!ReturnDesc) 373 { 374 Status = AE_NO_MEMORY; 375 goto Cleanup; 376 } 377 378 ReturnDesc->Integer.Value = AcpiExDoMathOp ( 379 WalkState->Opcode, 380 Operand[0]->Integer.Value, 381 Operand[1]->Integer.Value); 382 goto StoreResultToTarget; 383 } 384 385 switch (WalkState->Opcode) 386 { 387 case AML_MOD_OP: /* Mod (Dividend, Divisor, RemainderResult (ACPI 2.0) */ 388 389 ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); 390 if (!ReturnDesc) 391 { 392 Status = AE_NO_MEMORY; 393 goto Cleanup; 394 } 395 396 /* ReturnDesc will contain the remainder */ 397 398 Status = AcpiUtDivide ( 399 Operand[0]->Integer.Value, 400 Operand[1]->Integer.Value, 401 NULL, 402 &ReturnDesc->Integer.Value); 403 break; 404 405 case AML_CONCAT_OP: /* Concatenate (Data1, Data2, Result) */ 406 407 Status = AcpiExDoConcatenate ( 408 Operand[0], Operand[1], &ReturnDesc, WalkState); 409 break; 410 411 case AML_TO_STRING_OP: /* ToString (Buffer, Length, Result) (ACPI 2.0) */ 412 /* 413 * Input object is guaranteed to be a buffer at this point (it may have 414 * been converted.) Copy the raw buffer data to a new object of 415 * type String. 416 */ 417 418 /* 419 * Get the length of the new string. It is the smallest of: 420 * 1) Length of the input buffer 421 * 2) Max length as specified in the ToString operator 422 * 3) Length of input buffer up to a zero byte (null terminator) 423 * 424 * NOTE: A length of zero is ok, and will create a zero-length, null 425 * terminated string. 426 */ 427 while ((Length < Operand[0]->Buffer.Length) && 428 (Length < Operand[1]->Integer.Value) && 429 (Operand[0]->Buffer.Pointer[Length])) 430 { 431 Length++; 432 } 433 434 /* Allocate a new string object */ 435 436 ReturnDesc = AcpiUtCreateStringObject (Length); 437 if (!ReturnDesc) 438 { 439 Status = AE_NO_MEMORY; 440 goto Cleanup; 441 } 442 443 /* 444 * Copy the raw buffer data with no transform. 445 * (NULL terminated already) 446 */ 447 memcpy (ReturnDesc->String.Pointer, 448 Operand[0]->Buffer.Pointer, Length); 449 break; 450 451 case AML_CONCAT_RES_OP: 452 453 /* ConcatenateResTemplate (Buffer, Buffer, Result) (ACPI 2.0) */ 454 455 Status = AcpiExConcatTemplate ( 456 Operand[0], Operand[1], &ReturnDesc, WalkState); 457 break; 458 459 case AML_INDEX_OP: /* Index (Source Index Result) */ 460 461 /* Create the internal return object */ 462 463 ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE); 464 if (!ReturnDesc) 465 { 466 Status = AE_NO_MEMORY; 467 goto Cleanup; 468 } 469 470 /* Initialize the Index reference object */ 471 472 Index = Operand[1]->Integer.Value; 473 ReturnDesc->Reference.Value = (UINT32) Index; 474 ReturnDesc->Reference.Class = ACPI_REFCLASS_INDEX; 475 476 /* 477 * At this point, the Source operand is a String, Buffer, or Package. 478 * Verify that the index is within range. 479 */ 480 switch ((Operand[0])->Common.Type) 481 { 482 case ACPI_TYPE_STRING: 483 484 if (Index >= Operand[0]->String.Length) 485 { 486 Length = Operand[0]->String.Length; 487 Status = AE_AML_STRING_LIMIT; 488 } 489 490 ReturnDesc->Reference.TargetType = ACPI_TYPE_BUFFER_FIELD; 491 ReturnDesc->Reference.IndexPointer = 492 &(Operand[0]->Buffer.Pointer [Index]); 493 break; 494 495 case ACPI_TYPE_BUFFER: 496 497 if (Index >= Operand[0]->Buffer.Length) 498 { 499 Length = Operand[0]->Buffer.Length; 500 Status = AE_AML_BUFFER_LIMIT; 501 } 502 503 ReturnDesc->Reference.TargetType = ACPI_TYPE_BUFFER_FIELD; 504 ReturnDesc->Reference.IndexPointer = 505 &(Operand[0]->Buffer.Pointer [Index]); 506 break; 507 508 case ACPI_TYPE_PACKAGE: 509 510 if (Index >= Operand[0]->Package.Count) 511 { 512 Length = Operand[0]->Package.Count; 513 Status = AE_AML_PACKAGE_LIMIT; 514 } 515 516 ReturnDesc->Reference.TargetType = ACPI_TYPE_PACKAGE; 517 ReturnDesc->Reference.Where = 518 &Operand[0]->Package.Elements [Index]; 519 break; 520 521 default: 522 523 Status = AE_AML_INTERNAL; 524 goto Cleanup; 525 } 526 527 /* Failure means that the Index was beyond the end of the object */ 528 529 if (ACPI_FAILURE (Status)) 530 { 531 ACPI_EXCEPTION ((AE_INFO, Status, 532 "Index (0x%X%8.8X) is beyond end of object (length 0x%X)", 533 ACPI_FORMAT_UINT64 (Index), (UINT32) Length)); 534 goto Cleanup; 535 } 536 537 /* 538 * Save the target object and add a reference to it for the life 539 * of the index 540 */ 541 ReturnDesc->Reference.Object = Operand[0]; 542 AcpiUtAddReference (Operand[0]); 543 544 /* Store the reference to the Target */ 545 546 Status = AcpiExStore (ReturnDesc, Operand[2], WalkState); 547 548 /* Return the reference */ 549 550 WalkState->ResultObj = ReturnDesc; 551 goto Cleanup; 552 553 default: 554 555 ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X", 556 WalkState->Opcode)); 557 Status = AE_AML_BAD_OPCODE; 558 break; 559 } 560 561 562 StoreResultToTarget: 563 564 if (ACPI_SUCCESS (Status)) 565 { 566 /* 567 * Store the result of the operation (which is now in ReturnDesc) into 568 * the Target descriptor. 569 */ 570 Status = AcpiExStore (ReturnDesc, Operand[2], WalkState); 571 if (ACPI_FAILURE (Status)) 572 { 573 goto Cleanup; 574 } 575 576 if (!WalkState->ResultObj) 577 { 578 WalkState->ResultObj = ReturnDesc; 579 } 580 } 581 582 583 Cleanup: 584 585 /* Delete return object on error */ 586 587 if (ACPI_FAILURE (Status)) 588 { 589 AcpiUtRemoveReference (ReturnDesc); 590 WalkState->ResultObj = NULL; 591 } 592 593 return_ACPI_STATUS (Status); 594 } 595 596 597 /******************************************************************************* 598 * 599 * FUNCTION: AcpiExOpcode_2A_0T_1R 600 * 601 * PARAMETERS: WalkState - Current walk state 602 * 603 * RETURN: Status 604 * 605 * DESCRIPTION: Execute opcode with 2 arguments, no target, and a return value 606 * 607 ******************************************************************************/ 608 609 ACPI_STATUS 610 AcpiExOpcode_2A_0T_1R ( 611 ACPI_WALK_STATE *WalkState) 612 { 613 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0]; 614 ACPI_OPERAND_OBJECT *ReturnDesc = NULL; 615 ACPI_STATUS Status = AE_OK; 616 BOOLEAN LogicalResult = FALSE; 617 618 619 ACPI_FUNCTION_TRACE_STR (ExOpcode_2A_0T_1R, 620 AcpiPsGetOpcodeName (WalkState->Opcode)); 621 622 623 /* Create the internal return object */ 624 625 ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); 626 if (!ReturnDesc) 627 { 628 Status = AE_NO_MEMORY; 629 goto Cleanup; 630 } 631 632 /* Execute the Opcode */ 633 634 if (WalkState->OpInfo->Flags & AML_LOGICAL_NUMERIC) 635 { 636 /* LogicalOp (Operand0, Operand1) */ 637 638 Status = AcpiExDoLogicalNumericOp (WalkState->Opcode, 639 Operand[0]->Integer.Value, Operand[1]->Integer.Value, 640 &LogicalResult); 641 goto StoreLogicalResult; 642 } 643 else if (WalkState->OpInfo->Flags & AML_LOGICAL) 644 { 645 /* LogicalOp (Operand0, Operand1) */ 646 647 Status = AcpiExDoLogicalOp (WalkState->Opcode, Operand[0], 648 Operand[1], &LogicalResult); 649 goto StoreLogicalResult; 650 } 651 652 switch (WalkState->Opcode) 653 { 654 case AML_ACQUIRE_OP: /* Acquire (MutexObject, Timeout) */ 655 656 Status = AcpiExAcquireMutex (Operand[1], Operand[0], WalkState); 657 if (Status == AE_TIME) 658 { 659 LogicalResult = TRUE; /* TRUE = Acquire timed out */ 660 Status = AE_OK; 661 } 662 break; 663 664 665 case AML_WAIT_OP: /* Wait (EventObject, Timeout) */ 666 667 Status = AcpiExSystemWaitEvent (Operand[1], Operand[0]); 668 if (Status == AE_TIME) 669 { 670 LogicalResult = TRUE; /* TRUE, Wait timed out */ 671 Status = AE_OK; 672 } 673 break; 674 675 default: 676 677 ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X", 678 WalkState->Opcode)); 679 680 Status = AE_AML_BAD_OPCODE; 681 goto Cleanup; 682 } 683 684 685 StoreLogicalResult: 686 /* 687 * Set return value to according to LogicalResult. logical TRUE (all ones) 688 * Default is FALSE (zero) 689 */ 690 if (LogicalResult) 691 { 692 ReturnDesc->Integer.Value = ACPI_UINT64_MAX; 693 } 694 695 Cleanup: 696 697 /* Delete return object on error */ 698 699 if (ACPI_FAILURE (Status)) 700 { 701 AcpiUtRemoveReference (ReturnDesc); 702 } 703 704 /* Save return object on success */ 705 706 else 707 { 708 WalkState->ResultObj = ReturnDesc; 709 } 710 711 return_ACPI_STATUS (Status); 712 } 713