exmisc.c revision 82367
1 2/****************************************************************************** 3 * 4 * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes 5 * $Revision: 80 $ 6 * 7 *****************************************************************************/ 8 9/****************************************************************************** 10 * 11 * 1. Copyright Notice 12 * 13 * Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp. 14 * All rights reserved. 15 * 16 * 2. License 17 * 18 * 2.1. This is your license from Intel Corp. under its intellectual property 19 * rights. You may have additional license terms from the party that provided 20 * you this software, covering your right to use that party's intellectual 21 * property rights. 22 * 23 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 24 * copy of the source code appearing in this file ("Covered Code") an 25 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 26 * base code distributed originally by Intel ("Original Intel Code") to copy, 27 * make derivatives, distribute, use and display any portion of the Covered 28 * Code in any form, with the right to sublicense such rights; and 29 * 30 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 31 * license (with the right to sublicense), under only those claims of Intel 32 * patents that are infringed by the Original Intel Code, to make, use, sell, 33 * offer to sell, and import the Covered Code and derivative works thereof 34 * solely to the minimum extent necessary to exercise the above copyright 35 * license, and in no event shall the patent license extend to any additions 36 * to or modifications of the Original Intel Code. No other license or right 37 * is granted directly or by implication, estoppel or otherwise; 38 * 39 * The above copyright and patent license is granted only if the following 40 * conditions are met: 41 * 42 * 3. Conditions 43 * 44 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 45 * Redistribution of source code of any substantial portion of the Covered 46 * Code or modification with rights to further distribute source must include 47 * the above Copyright Notice, the above License, this list of Conditions, 48 * and the following Disclaimer and Export Compliance provision. In addition, 49 * Licensee must cause all Covered Code to which Licensee contributes to 50 * contain a file documenting the changes Licensee made to create that Covered 51 * Code and the date of any change. Licensee must include in that file the 52 * documentation of any changes made by any predecessor Licensee. Licensee 53 * must include a prominent statement that the modification is derived, 54 * directly or indirectly, from Original Intel Code. 55 * 56 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 57 * Redistribution of source code of any substantial portion of the Covered 58 * Code or modification without rights to further distribute source must 59 * include the following Disclaimer and Export Compliance provision in the 60 * documentation and/or other materials provided with distribution. In 61 * addition, Licensee may not authorize further sublicense of source of any 62 * portion of the Covered Code, and must include terms to the effect that the 63 * license from Licensee to its licensee is limited to the intellectual 64 * property embodied in the software Licensee provides to its licensee, and 65 * not to intellectual property embodied in modifications its licensee may 66 * make. 67 * 68 * 3.3. Redistribution of Executable. Redistribution in executable form of any 69 * substantial portion of the Covered Code or modification must reproduce the 70 * above Copyright Notice, and the following Disclaimer and Export Compliance 71 * provision in the documentation and/or other materials provided with the 72 * distribution. 73 * 74 * 3.4. Intel retains all right, title, and interest in and to the Original 75 * Intel Code. 76 * 77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 78 * Intel shall be used in advertising or otherwise to promote the sale, use or 79 * other dealings in products derived from or relating to the Covered Code 80 * without prior written authorization from Intel. 81 * 82 * 4. Disclaimer and Export Compliance 83 * 84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 85 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 87 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 88 89 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 90 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 91 * PARTICULAR PURPOSE. 92 * 93 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 94 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 95 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 96 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 97 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 98 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 99 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 100 * LIMITED REMEDY. 101 * 102 * 4.3. Licensee shall not export, either directly or indirectly, any of this 103 * software or system incorporating such software without first obtaining any 104 * required license or other approval from the U. S. Department of Commerce or 105 * any other agency or department of the United States Government. In the 106 * event Licensee exports any such software from the United States or 107 * re-exports any such software from a foreign destination, Licensee shall 108 * ensure that the distribution and export/re-export of the software is in 109 * compliance with all laws, regulations, orders, or other restrictions of the 110 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 111 * any of its subsidiaries will export/re-export any technical data, process, 112 * software, or service, directly or indirectly, to any country for which the 113 * United States government or any agency thereof requires an export license, 114 * other governmental approval, or letter of assurance, without first obtaining 115 * such license, approval or letter. 116 * 117 *****************************************************************************/ 118 119#define __EXMISC_C__ 120 121#include "acpi.h" 122#include "acparser.h" 123#include "acinterp.h" 124#include "amlcode.h" 125#include "acdispat.h" 126 127 128#define _COMPONENT ACPI_EXECUTER 129 MODULE_NAME ("exmisc") 130 131 132/******************************************************************************* 133 * 134 * FUNCTION: AcpiExFatal 135 * 136 * PARAMETERS: none 137 * 138 * RETURN: Status. If the OS returns from the OSD call, we just keep 139 * on going. 140 * 141 * DESCRIPTION: Execute Fatal operator 142 * 143 * ACPI SPECIFICATION REFERENCES: 144 * DefFatal := FatalOp FatalType FatalCode FatalArg 145 * FatalType := ByteData 146 * FatalCode := DWordData 147 * FatalArg := TermArg=>Integer 148 * 149 ******************************************************************************/ 150 151ACPI_STATUS 152AcpiExFatal ( 153 ACPI_WALK_STATE *WalkState) 154{ 155 ACPI_OPERAND_OBJECT *TypeDesc; 156 ACPI_OPERAND_OBJECT *CodeDesc; 157 ACPI_OPERAND_OBJECT *ArgDesc; 158 ACPI_STATUS Status; 159 160 161 FUNCTION_TRACE ("ExFatal"); 162 163 164 /* Resolve operands */ 165 166 Status = AcpiExResolveOperands (AML_FATAL_OP, WALK_OPERANDS, WalkState); 167 DUMP_OPERANDS (WALK_OPERANDS, IMODE_EXECUTE, 168 AcpiPsGetOpcodeName (AML_FATAL_OP), 169 3, "after AcpiExResolveOperands"); 170 171 /* Get operands */ 172 173 Status |= AcpiDsObjStackPopObject (&ArgDesc, WalkState); 174 Status |= AcpiDsObjStackPopObject (&CodeDesc, WalkState); 175 Status |= AcpiDsObjStackPopObject (&TypeDesc, WalkState); 176 if (ACPI_FAILURE (Status)) 177 { 178 /* Invalid parameters on object stack */ 179 180 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "bad operand(s) (Status=%X)\n", 181 Status)); 182 goto Cleanup; 183 } 184 185 186 /* DefFatal := FatalOp FatalType FatalCode FatalArg */ 187 188 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 189 "Type %x Code %x Arg %x <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n", 190 TypeDesc->Integer.Value, CodeDesc->Integer.Value, ArgDesc->Integer.Value)); 191 192 193 /* 194 * TBD: [Unhandled] call OSD interface to notify OS of fatal error 195 * requiring shutdown! 196 */ 197 198 199Cleanup: 200 201 /* Free the operands */ 202 203 AcpiUtRemoveReference (ArgDesc); 204 AcpiUtRemoveReference (CodeDesc); 205 AcpiUtRemoveReference (TypeDesc); 206 207 208 /* If we get back from the OS call, we might as well keep going. */ 209 210 REPORT_WARNING (("An AML \"Fatal\" Opcode (FatalOp) was executed\n")); 211 return_ACPI_STATUS (AE_OK); 212} 213 214 215/******************************************************************************* 216 * 217 * FUNCTION: AcpiExTriadic 218 * 219 * PARAMETERS: Opcode - The opcode to be executed 220 * WalkState - Current walk state 221 * ReturnDesc - Where to store the return object 222 * 223 * RETURN: Status 224 * 225 * DESCRIPTION: Execute Triadic operator (3 operands) 226 * 227 * ALLOCATION: Deletes one operand descriptor -- other remains on stack 228 * 229 ******************************************************************************/ 230 231ACPI_STATUS 232AcpiExTriadic ( 233 UINT16 Opcode, 234 ACPI_WALK_STATE *WalkState, 235 ACPI_OPERAND_OBJECT **ReturnDesc) 236{ 237 ACPI_OPERAND_OBJECT *ObjDesc1; 238 ACPI_OPERAND_OBJECT *ObjDesc2; 239 ACPI_OPERAND_OBJECT *ResDesc; 240 ACPI_OPERAND_OBJECT *RetDesc = NULL; 241 ACPI_OPERAND_OBJECT *TmpDesc; 242 ACPI_SIGNAL_FATAL_INFO *Fatal; 243 ACPI_STATUS Status; 244 245 246 247 FUNCTION_TRACE ("ExTriadic"); 248 249 250 /* Resolve operands */ 251 /* First operand can be either a package or a buffer */ 252 253 Status = AcpiExResolveOperands (AML_INDEX_OP, WALK_OPERANDS, WalkState); 254 DUMP_OPERANDS (WALK_OPERANDS, IMODE_EXECUTE, 255 AcpiPsGetOpcodeName (AML_INDEX_OP), 256 3, "after AcpiExResolveOperands"); 257 258 /* Get all operands */ 259 260 Status |= AcpiDsObjStackPopObject (&ResDesc, WalkState); 261 Status |= AcpiDsObjStackPopObject (&ObjDesc2, WalkState); 262 Status |= AcpiDsObjStackPopObject (&ObjDesc1, WalkState); 263 if (ACPI_FAILURE (Status)) 264 { 265 /* Invalid parameters on object stack */ 266 267 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "bad operand(s) (Status=%X)\n", 268 Status)); 269 goto Cleanup; 270 } 271 272 273 274 switch (Opcode) 275 { 276 277 case AML_FATAL_OP: 278 279 /* DefFatal := FatalOp FatalType FatalCode FatalArg */ 280 281 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 282 "FatalOp: Type %x Code %x Arg %x <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n", 283 (UINT32) ObjDesc1->Integer.Value, (UINT32) ObjDesc2->Integer.Value, 284 (UINT32) ResDesc->Integer.Value)); 285 286 287 Fatal = ACPI_MEM_ALLOCATE (sizeof (ACPI_SIGNAL_FATAL_INFO)); 288 if (Fatal) 289 { 290 Fatal->Type = (UINT32) ObjDesc1->Integer.Value; 291 Fatal->Code = (UINT32) ObjDesc2->Integer.Value; 292 Fatal->Argument = (UINT32) ResDesc->Integer.Value; 293 } 294 295 /* 296 * Signal the OS 297 */ 298 AcpiOsSignal (ACPI_SIGNAL_FATAL, Fatal); 299 300 /* Might return while OS is shutting down */ 301 302 ACPI_MEM_FREE (Fatal); 303 break; 304 305 306 307 case AML_MID_OP: 308 309 /* DefMid := MidOp Source Index Length Result */ 310 311 /* Create the internal return object (string or buffer) */ 312 313 break; 314 315 316 case AML_INDEX_OP: 317 318 /* DefIndex := IndexOp Source Index Destination */ 319 320 /* Create the internal return object */ 321 322 RetDesc = AcpiUtCreateInternalObject (INTERNAL_TYPE_REFERENCE); 323 if (!RetDesc) 324 { 325 Status = AE_NO_MEMORY; 326 goto Cleanup; 327 } 328 /* 329 * At this point, the ObjDesc1 operand is either a Package or a Buffer 330 */ 331 if (ObjDesc1->Common.Type == ACPI_TYPE_PACKAGE) 332 { 333 /* Object to be indexed is a Package */ 334 335 if (ObjDesc2->Integer.Value >= ObjDesc1->Package.Count) 336 { 337 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Index value beyond package end\n")); 338 Status = AE_AML_PACKAGE_LIMIT; 339 goto Cleanup; 340 } 341 342 if ((ResDesc->Common.Type == INTERNAL_TYPE_REFERENCE) && 343 (ResDesc->Reference.Opcode == AML_ZERO_OP)) 344 { 345 /* 346 * There is no actual result descriptor (the ZeroOp Result 347 * descriptor is a placeholder), so just delete the placeholder and 348 * return a reference to the package element 349 */ 350 AcpiUtRemoveReference (ResDesc); 351 } 352 353 else 354 { 355 /* 356 * Each element of the package is an internal object. Get the one 357 * we are after. 358 */ 359 TmpDesc = ObjDesc1->Package.Elements[ObjDesc2->Integer.Value]; 360 RetDesc->Reference.Opcode = AML_INDEX_OP; 361 RetDesc->Reference.TargetType = TmpDesc->Common.Type; 362 RetDesc->Reference.Object = TmpDesc; 363 364 Status = AcpiExStore (RetDesc, ResDesc, WalkState); 365 RetDesc->Reference.Object = NULL; 366 } 367 368 /* 369 * The local return object must always be a reference to the package element, 370 * not the element itself. 371 */ 372 RetDesc->Reference.Opcode = AML_INDEX_OP; 373 RetDesc->Reference.TargetType = ACPI_TYPE_PACKAGE; 374 RetDesc->Reference.Where = &ObjDesc1->Package.Elements[ObjDesc2->Integer.Value]; 375 } 376 377 else 378 { 379 /* Object to be indexed is a Buffer */ 380 381 if (ObjDesc2->Integer.Value >= ObjDesc1->Buffer.Length) 382 { 383 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Index value beyond end of buffer\n")); 384 Status = AE_AML_BUFFER_LIMIT; 385 goto Cleanup; 386 } 387 388 RetDesc->Reference.Opcode = AML_INDEX_OP; 389 RetDesc->Reference.TargetType = ACPI_TYPE_BUFFER_FIELD; 390 RetDesc->Reference.Object = ObjDesc1; 391 RetDesc->Reference.Offset = (UINT32) ObjDesc2->Integer.Value; 392 393 Status = AcpiExStore (RetDesc, ResDesc, WalkState); 394 } 395 break; 396 } 397 398 399 400Cleanup: 401 402 /* Always delete operands */ 403 404 AcpiUtRemoveReference (ObjDesc1); 405 AcpiUtRemoveReference (ObjDesc2); 406 407 /* Delete return object on error */ 408 409 if (ACPI_FAILURE (Status)) 410 { 411 AcpiUtRemoveReference (ResDesc); 412 413 if (RetDesc) 414 { 415 AcpiUtRemoveReference (RetDesc); 416 RetDesc = NULL; 417 } 418 } 419 420 /* Set the return object and exit */ 421 422 *ReturnDesc = RetDesc; 423 return_ACPI_STATUS (Status); 424} 425 426 427/******************************************************************************* 428 * 429 * FUNCTION: AcpiExHexadic 430 * 431 * PARAMETERS: Opcode - The opcode to be executed 432 * WalkState - Current walk state 433 * ReturnDesc - Where to store the return object 434 * 435 * RETURN: Status 436 * 437 * DESCRIPTION: Execute Match operator 438 * 439 ******************************************************************************/ 440 441ACPI_STATUS 442AcpiExHexadic ( 443 UINT16 Opcode, 444 ACPI_WALK_STATE *WalkState, 445 ACPI_OPERAND_OBJECT **ReturnDesc) 446{ 447 ACPI_OPERAND_OBJECT *PkgDesc; 448 ACPI_OPERAND_OBJECT *Op1Desc; 449 ACPI_OPERAND_OBJECT *V1Desc; 450 ACPI_OPERAND_OBJECT *Op2Desc; 451 ACPI_OPERAND_OBJECT *V2Desc; 452 ACPI_OPERAND_OBJECT *StartDesc; 453 ACPI_OPERAND_OBJECT *RetDesc = NULL; 454 ACPI_STATUS Status; 455 UINT32 Index; 456 UINT32 MatchValue = (UINT32) -1; 457 458 459 FUNCTION_TRACE ("ExHexadic"); 460 461 462 /* Resolve all operands */ 463 464 Status = AcpiExResolveOperands (AML_MATCH_OP, WALK_OPERANDS, WalkState); 465 DUMP_OPERANDS (WALK_OPERANDS, IMODE_EXECUTE, 466 AcpiPsGetOpcodeName (AML_MATCH_OP), 467 6, "after AcpiExResolveOperands"); 468 469 /* Get all operands */ 470 471 Status |= AcpiDsObjStackPopObject (&StartDesc, WalkState); 472 Status |= AcpiDsObjStackPopObject (&V2Desc, WalkState); 473 Status |= AcpiDsObjStackPopObject (&Op2Desc, WalkState); 474 Status |= AcpiDsObjStackPopObject (&V1Desc, WalkState); 475 Status |= AcpiDsObjStackPopObject (&Op1Desc, WalkState); 476 Status |= AcpiDsObjStackPopObject (&PkgDesc, WalkState); 477 478 if (ACPI_FAILURE (Status)) 479 { 480 /* Invalid parameters on object stack */ 481 482 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "bad operand(s) (Status=%X)\n", 483 Status)); 484 goto Cleanup; 485 } 486 487 488 switch (Opcode) 489 { 490 491 case AML_MATCH_OP: 492 493 /* Validate match comparison sub-opcodes */ 494 495 if ((Op1Desc->Integer.Value > MAX_MATCH_OPERATOR) || 496 (Op2Desc->Integer.Value > MAX_MATCH_OPERATOR)) 497 { 498 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "operation encoding out of range\n")); 499 Status = AE_AML_OPERAND_VALUE; 500 goto Cleanup; 501 } 502 503 Index = (UINT32) StartDesc->Integer.Value; 504 if (Index >= (UINT32) PkgDesc->Package.Count) 505 { 506 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Start position value out of range\n")); 507 Status = AE_AML_PACKAGE_LIMIT; 508 goto Cleanup; 509 } 510 511 RetDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); 512 if (!RetDesc) 513 { 514 Status = AE_NO_MEMORY; 515 goto Cleanup; 516 517 } 518 519 /* 520 * Examine each element until a match is found. Within the loop, 521 * "continue" signifies that the current element does not match 522 * and the next should be examined. 523 * Upon finding a match, the loop will terminate via "break" at 524 * the bottom. If it terminates "normally", MatchValue will be -1 525 * (its initial value) indicating that no match was found. When 526 * returned as a Number, this will produce the Ones value as specified. 527 */ 528 529 for ( ; Index < PkgDesc->Package.Count; ++Index) 530 { 531 /* 532 * Treat any NULL or non-numeric elements as non-matching. 533 * TBD [Unhandled] - if an element is a Name, 534 * should we examine its value? 535 */ 536 if (!PkgDesc->Package.Elements[Index] || 537 ACPI_TYPE_INTEGER != PkgDesc->Package.Elements[Index]->Common.Type) 538 { 539 continue; 540 } 541 542 /* 543 * Within these switch statements: 544 * "break" (exit from the switch) signifies a match; 545 * "continue" (proceed to next iteration of enclosing 546 * "for" loop) signifies a non-match. 547 */ 548 switch (Op1Desc->Integer.Value) 549 { 550 551 case MATCH_MTR: /* always true */ 552 553 break; 554 555 556 case MATCH_MEQ: /* true if equal */ 557 558 if (PkgDesc->Package.Elements[Index]->Integer.Value 559 != V1Desc->Integer.Value) 560 { 561 continue; 562 } 563 break; 564 565 566 case MATCH_MLE: /* true if less than or equal */ 567 568 if (PkgDesc->Package.Elements[Index]->Integer.Value 569 > V1Desc->Integer.Value) 570 { 571 continue; 572 } 573 break; 574 575 576 case MATCH_MLT: /* true if less than */ 577 578 if (PkgDesc->Package.Elements[Index]->Integer.Value 579 >= V1Desc->Integer.Value) 580 { 581 continue; 582 } 583 break; 584 585 586 case MATCH_MGE: /* true if greater than or equal */ 587 588 if (PkgDesc->Package.Elements[Index]->Integer.Value 589 < V1Desc->Integer.Value) 590 { 591 continue; 592 } 593 break; 594 595 596 case MATCH_MGT: /* true if greater than */ 597 598 if (PkgDesc->Package.Elements[Index]->Integer.Value 599 <= V1Desc->Integer.Value) 600 { 601 continue; 602 } 603 break; 604 605 606 default: /* undefined */ 607 608 continue; 609 } 610 611 612 switch(Op2Desc->Integer.Value) 613 { 614 615 case MATCH_MTR: 616 617 break; 618 619 620 case MATCH_MEQ: 621 622 if (PkgDesc->Package.Elements[Index]->Integer.Value 623 != V2Desc->Integer.Value) 624 { 625 continue; 626 } 627 break; 628 629 630 case MATCH_MLE: 631 632 if (PkgDesc->Package.Elements[Index]->Integer.Value 633 > V2Desc->Integer.Value) 634 { 635 continue; 636 } 637 break; 638 639 640 case MATCH_MLT: 641 642 if (PkgDesc->Package.Elements[Index]->Integer.Value 643 >= V2Desc->Integer.Value) 644 { 645 continue; 646 } 647 break; 648 649 650 case MATCH_MGE: 651 652 if (PkgDesc->Package.Elements[Index]->Integer.Value 653 < V2Desc->Integer.Value) 654 { 655 continue; 656 } 657 break; 658 659 660 case MATCH_MGT: 661 662 if (PkgDesc->Package.Elements[Index]->Integer.Value 663 <= V2Desc->Integer.Value) 664 { 665 continue; 666 } 667 break; 668 669 670 default: 671 672 continue; 673 } 674 675 /* Match found: exit from loop */ 676 677 MatchValue = Index; 678 break; 679 } 680 681 /* MatchValue is the return value */ 682 683 RetDesc->Integer.Value = MatchValue; 684 break; 685 686 } 687 688 689 690Cleanup: 691 692 /* Free the operands */ 693 694 AcpiUtRemoveReference (StartDesc); 695 AcpiUtRemoveReference (V2Desc); 696 AcpiUtRemoveReference (Op2Desc); 697 AcpiUtRemoveReference (V1Desc); 698 AcpiUtRemoveReference (Op1Desc); 699 AcpiUtRemoveReference (PkgDesc); 700 701 702 /* Delete return object on error */ 703 704 if (ACPI_FAILURE (Status) && 705 (RetDesc)) 706 { 707 AcpiUtRemoveReference (RetDesc); 708 RetDesc = NULL; 709 } 710 711 712 /* Set the return object and exit */ 713 714 *ReturnDesc = RetDesc; 715 return_ACPI_STATUS (Status); 716} 717