dsmthdat.c revision 83174
1/******************************************************************************* 2 * 3 * Module Name: dsmthdat - control method arguments and local variables 4 * $Revision: 49 $ 5 * 6 ******************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp. 13 * All rights reserved. 14 * 15 * 2. License 16 * 17 * 2.1. This is your license from Intel Corp. under its intellectual property 18 * rights. You may have additional license terms from the party that provided 19 * you this software, covering your right to use that party's intellectual 20 * property rights. 21 * 22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23 * copy of the source code appearing in this file ("Covered Code") an 24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25 * base code distributed originally by Intel ("Original Intel Code") to copy, 26 * make derivatives, distribute, use and display any portion of the Covered 27 * Code in any form, with the right to sublicense such rights; and 28 * 29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30 * license (with the right to sublicense), under only those claims of Intel 31 * patents that are infringed by the Original Intel Code, to make, use, sell, 32 * offer to sell, and import the Covered Code and derivative works thereof 33 * solely to the minimum extent necessary to exercise the above copyright 34 * license, and in no event shall the patent license extend to any additions 35 * to or modifications of the Original Intel Code. No other license or right 36 * is granted directly or by implication, estoppel or otherwise; 37 * 38 * The above copyright and patent license is granted only if the following 39 * conditions are met: 40 * 41 * 3. Conditions 42 * 43 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44 * Redistribution of source code of any substantial portion of the Covered 45 * Code or modification with rights to further distribute source must include 46 * the above Copyright Notice, the above License, this list of Conditions, 47 * and the following Disclaimer and Export Compliance provision. In addition, 48 * Licensee must cause all Covered Code to which Licensee contributes to 49 * contain a file documenting the changes Licensee made to create that Covered 50 * Code and the date of any change. Licensee must include in that file the 51 * documentation of any changes made by any predecessor Licensee. Licensee 52 * must include a prominent statement that the modification is derived, 53 * directly or indirectly, from Original Intel Code. 54 * 55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56 * Redistribution of source code of any substantial portion of the Covered 57 * Code or modification without rights to further distribute source must 58 * include the following Disclaimer and Export Compliance provision in the 59 * documentation and/or other materials provided with distribution. In 60 * addition, Licensee may not authorize further sublicense of source of any 61 * portion of the Covered Code, and must include terms to the effect that the 62 * license from Licensee to its licensee is limited to the intellectual 63 * property embodied in the software Licensee provides to its licensee, and 64 * not to intellectual property embodied in modifications its licensee may 65 * make. 66 * 67 * 3.3. Redistribution of Executable. Redistribution in executable form of any 68 * substantial portion of the Covered Code or modification must reproduce the 69 * above Copyright Notice, and the following Disclaimer and Export Compliance 70 * provision in the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3.4. Intel retains all right, title, and interest in and to the Original 74 * Intel Code. 75 * 76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 77 * Intel shall be used in advertising or otherwise to promote the sale, use or 78 * other dealings in products derived from or relating to the Covered Code 79 * without prior written authorization from Intel. 80 * 81 * 4. Disclaimer and Export Compliance 82 * 83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 89 * PARTICULAR PURPOSE. 90 * 91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 98 * LIMITED REMEDY. 99 * 100 * 4.3. Licensee shall not export, either directly or indirectly, any of this 101 * software or system incorporating such software without first obtaining any 102 * required license or other approval from the U. S. Department of Commerce or 103 * any other agency or department of the United States Government. In the 104 * event Licensee exports any such software from the United States or 105 * re-exports any such software from a foreign destination, Licensee shall 106 * ensure that the distribution and export/re-export of the software is in 107 * compliance with all laws, regulations, orders, or other restrictions of the 108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 109 * any of its subsidiaries will export/re-export any technical data, process, 110 * software, or service, directly or indirectly, to any country for which the 111 * United States government or any agency thereof requires an export license, 112 * other governmental approval, or letter of assurance, without first obtaining 113 * such license, approval or letter. 114 * 115 *****************************************************************************/ 116 117#define __DSMTHDAT_C__ 118 119#include "acpi.h" 120#include "acparser.h" 121#include "acdispat.h" 122#include "acinterp.h" 123#include "amlcode.h" 124#include "acnamesp.h" 125 126 127#define _COMPONENT ACPI_DISPATCHER 128 MODULE_NAME ("dsmthdat") 129 130 131/******************************************************************************* 132 * 133 * FUNCTION: AcpiDsMethodDataInit 134 * 135 * PARAMETERS: WalkState - Current walk state object 136 * 137 * RETURN: Status 138 * 139 * DESCRIPTION: Initialize the data structures that hold the method's arguments 140 * and locals. The data struct is an array of NTEs for each. 141 * This allows RefOf and DeRefOf to work properly for these 142 * special data types. 143 * 144 ******************************************************************************/ 145 146ACPI_STATUS 147AcpiDsMethodDataInit ( 148 ACPI_WALK_STATE *WalkState) 149{ 150 UINT32 i; 151 152 153 FUNCTION_TRACE ("DsMethodDataInit"); 154 155 /* 156 * WalkState fields are initialized to zero by the 157 * ACPI_MEM_CALLOCATE(). 158 * 159 * An Node is assigned to each argument and local so 160 * that RefOf() can return a pointer to the Node. 161 */ 162 163 /* Init the method arguments */ 164 165 for (i = 0; i < MTH_NUM_ARGS; i++) 166 { 167 MOVE_UNALIGNED32_TO_32 (&WalkState->Arguments[i].Name, 168 NAMEOF_ARG_NTE); 169 WalkState->Arguments[i].Name |= (i << 24); 170 WalkState->Arguments[i].DataType = ACPI_DESC_TYPE_NAMED; 171 WalkState->Arguments[i].Type = ACPI_TYPE_ANY; 172 WalkState->Arguments[i].Flags = ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_ARG; 173 } 174 175 /* Init the method locals */ 176 177 for (i = 0; i < MTH_NUM_LOCALS; i++) 178 { 179 MOVE_UNALIGNED32_TO_32 (&WalkState->LocalVariables[i].Name, 180 NAMEOF_LOCAL_NTE); 181 182 WalkState->LocalVariables[i].Name |= (i << 24); 183 WalkState->LocalVariables[i].DataType = ACPI_DESC_TYPE_NAMED; 184 WalkState->LocalVariables[i].Type = ACPI_TYPE_ANY; 185 WalkState->LocalVariables[i].Flags = ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_LOCAL; 186 } 187 188 return_ACPI_STATUS (AE_OK); 189} 190 191 192/******************************************************************************* 193 * 194 * FUNCTION: AcpiDsMethodDataDeleteAll 195 * 196 * PARAMETERS: WalkState - Current walk state object 197 * 198 * RETURN: Status 199 * 200 * DESCRIPTION: Delete method locals and arguments. Arguments are only 201 * deleted if this method was called from another method. 202 * 203 ******************************************************************************/ 204 205ACPI_STATUS 206AcpiDsMethodDataDeleteAll ( 207 ACPI_WALK_STATE *WalkState) 208{ 209 UINT32 Index; 210 ACPI_OPERAND_OBJECT *Object; 211 212 213 FUNCTION_TRACE ("DsMethodDataDeleteAll"); 214 215 216 /* Delete the locals */ 217 218 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Deleting local variables in %p\n", WalkState)); 219 220 for (Index = 0; Index < MTH_NUM_LOCALS; Index++) 221 { 222 Object = WalkState->LocalVariables[Index].Object; 223 if (Object) 224 { 225 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%d=%p\n", Index, Object)); 226 227 /* Remove first */ 228 229 WalkState->LocalVariables[Index].Object = NULL; 230 231 /* Was given a ref when stored */ 232 233 AcpiUtRemoveReference (Object); 234 } 235 } 236 237 238 /* Delete the arguments */ 239 240 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Deleting arguments in %p\n", WalkState)); 241 242 for (Index = 0; Index < MTH_NUM_ARGS; Index++) 243 { 244 Object = WalkState->Arguments[Index].Object; 245 if (Object) 246 { 247 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%d=%p\n", Index, Object)); 248 249 /* Remove first */ 250 251 WalkState->Arguments[Index].Object = NULL; 252 253 /* Was given a ref when stored */ 254 255 AcpiUtRemoveReference (Object); 256 } 257 } 258 259 return_ACPI_STATUS (AE_OK); 260} 261 262 263/******************************************************************************* 264 * 265 * FUNCTION: AcpiDsMethodDataInitArgs 266 * 267 * PARAMETERS: *Params - Pointer to a parameter list for the method 268 * MaxParamCount - The arg count for this method 269 * WalkState - Current walk state object 270 * 271 * RETURN: Status 272 * 273 * DESCRIPTION: Initialize arguments for a method 274 * 275 ******************************************************************************/ 276 277ACPI_STATUS 278AcpiDsMethodDataInitArgs ( 279 ACPI_OPERAND_OBJECT **Params, 280 UINT32 MaxParamCount, 281 ACPI_WALK_STATE *WalkState) 282{ 283 ACPI_STATUS Status; 284 UINT32 Mindex; 285 UINT32 Pindex; 286 287 288 FUNCTION_TRACE_PTR ("DsMethodDataInitArgs", Params); 289 290 291 if (!Params) 292 { 293 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "No param list passed to method\n")); 294 return_ACPI_STATUS (AE_OK); 295 } 296 297 /* Copy passed parameters into the new method stack frame */ 298 299 for (Pindex = Mindex = 0; 300 (Mindex < MTH_NUM_ARGS) && (Pindex < MaxParamCount); 301 Mindex++) 302 { 303 if (Params[Pindex]) 304 { 305 /* 306 * A valid parameter. 307 * Set the current method argument to the 308 * Params[Pindex++] argument object descriptor 309 */ 310 Status = AcpiDsStoreObjectToLocal (AML_ARG_OP, Mindex, 311 Params[Pindex], WalkState); 312 if (ACPI_FAILURE (Status)) 313 { 314 break; 315 } 316 317 Pindex++; 318 } 319 320 else 321 { 322 break; 323 } 324 } 325 326 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%d args passed to method\n", Pindex)); 327 return_ACPI_STATUS (AE_OK); 328} 329 330 331/******************************************************************************* 332 * 333 * FUNCTION: AcpiDsMethodDataGetEntry 334 * 335 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 336 * Index - Which localVar or argument to get 337 * Entry - Pointer to where a pointer to the stack 338 * entry is returned. 339 * WalkState - Current walk state object 340 * 341 * RETURN: Status 342 * 343 * DESCRIPTION: Get the address of the object entry given by Opcode:Index 344 * 345 ******************************************************************************/ 346 347ACPI_STATUS 348AcpiDsMethodDataGetEntry ( 349 UINT16 Opcode, 350 UINT32 Index, 351 ACPI_WALK_STATE *WalkState, 352 ACPI_OPERAND_OBJECT ***Entry) 353{ 354 355 FUNCTION_TRACE_U32 ("DsMethodDataGetEntry", Index); 356 357 358 /* 359 * Get the requested object. 360 * The stack "Opcode" is either a LocalVariable or an Argument 361 */ 362 switch (Opcode) 363 { 364 365 case AML_LOCAL_OP: 366 367 if (Index > MTH_MAX_LOCAL) 368 { 369 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "LocalVar index %d is invalid (max %d)\n", 370 Index, MTH_MAX_LOCAL)); 371 return_ACPI_STATUS (AE_BAD_PARAMETER); 372 } 373 374 *Entry = (ACPI_OPERAND_OBJECT **) 375 &WalkState->LocalVariables[Index].Object; 376 break; 377 378 379 case AML_ARG_OP: 380 381 if (Index > MTH_MAX_ARG) 382 { 383 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Arg index %d is invalid (max %d)\n", 384 Index, MTH_MAX_ARG)); 385 return_ACPI_STATUS (AE_BAD_PARAMETER); 386 } 387 388 *Entry = (ACPI_OPERAND_OBJECT **) 389 &WalkState->Arguments[Index].Object; 390 break; 391 392 393 default: 394 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Opcode %d is invalid\n", Opcode)); 395 return_ACPI_STATUS (AE_BAD_PARAMETER); 396 } 397 398 399 return_ACPI_STATUS (AE_OK); 400} 401 402 403/******************************************************************************* 404 * 405 * FUNCTION: AcpiDsMethodDataSetEntry 406 * 407 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 408 * Index - Which localVar or argument to get 409 * Object - Object to be inserted into the stack entry 410 * WalkState - Current walk state object 411 * 412 * RETURN: Status 413 * 414 * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index. 415 * 416 ******************************************************************************/ 417 418ACPI_STATUS 419AcpiDsMethodDataSetEntry ( 420 UINT16 Opcode, 421 UINT32 Index, 422 ACPI_OPERAND_OBJECT *Object, 423 ACPI_WALK_STATE *WalkState) 424{ 425 ACPI_STATUS Status; 426 ACPI_OPERAND_OBJECT **Entry; 427 428 429 FUNCTION_TRACE ("DsMethodDataSetEntry"); 430 431 432 /* Get a pointer to the stack entry to set */ 433 434 Status = AcpiDsMethodDataGetEntry (Opcode, Index, WalkState, &Entry); 435 if (ACPI_FAILURE (Status)) 436 { 437 return_ACPI_STATUS (Status); 438 } 439 440 /* Increment ref count so object can't be deleted while installed */ 441 442 AcpiUtAddReference (Object); 443 444 /* Install the object into the stack entry */ 445 446 *Entry = Object; 447 448 return_ACPI_STATUS (AE_OK); 449} 450 451 452/******************************************************************************* 453 * 454 * FUNCTION: AcpiDsMethodDataGetType 455 * 456 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 457 * Index - Which localVar or argument whose type 458 * to get 459 * WalkState - Current walk state object 460 * 461 * RETURN: Data type of selected Arg or Local 462 * Used only in ExecMonadic2()/TypeOp. 463 * 464 ******************************************************************************/ 465 466ACPI_OBJECT_TYPE8 467AcpiDsMethodDataGetType ( 468 UINT16 Opcode, 469 UINT32 Index, 470 ACPI_WALK_STATE *WalkState) 471{ 472 ACPI_STATUS Status; 473 ACPI_OPERAND_OBJECT **Entry; 474 ACPI_OPERAND_OBJECT *Object; 475 476 477 FUNCTION_TRACE ("DsMethodDataGetType"); 478 479 480 /* Get a pointer to the requested stack entry */ 481 482 Status = AcpiDsMethodDataGetEntry (Opcode, Index, WalkState, &Entry); 483 if (ACPI_FAILURE (Status)) 484 { 485 return_VALUE ((ACPI_TYPE_NOT_FOUND)); 486 } 487 488 /* Get the object from the method stack */ 489 490 Object = *Entry; 491 492 /* Get the object type */ 493 494 if (!Object) 495 { 496 /* Any == 0 => "uninitialized" -- see spec 15.2.3.5.2.28 */ 497 return_VALUE (ACPI_TYPE_ANY); 498 } 499 500 return_VALUE (Object->Common.Type); 501} 502 503 504/******************************************************************************* 505 * 506 * FUNCTION: AcpiDsMethodDataGetNode 507 * 508 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 509 * Index - Which localVar or argument whose type 510 * to get 511 * WalkState - Current walk state object 512 * 513 * RETURN: Get the Node associated with a local or arg. 514 * 515 ******************************************************************************/ 516 517ACPI_NAMESPACE_NODE * 518AcpiDsMethodDataGetNode ( 519 UINT16 Opcode, 520 UINT32 Index, 521 ACPI_WALK_STATE *WalkState) 522{ 523 ACPI_NAMESPACE_NODE *Node = NULL; 524 525 526 FUNCTION_TRACE ("DsMethodDataGetNode"); 527 528 529 switch (Opcode) 530 { 531 532 case AML_LOCAL_OP: 533 534 if (Index > MTH_MAX_LOCAL) 535 { 536 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Local index %d is invalid (max %d)\n", 537 Index, MTH_MAX_LOCAL)); 538 return_PTR (Node); 539 } 540 541 Node = &WalkState->LocalVariables[Index]; 542 break; 543 544 545 case AML_ARG_OP: 546 547 if (Index > MTH_MAX_ARG) 548 { 549 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Arg index %d is invalid (max %d)\n", 550 Index, MTH_MAX_ARG)); 551 return_PTR (Node); 552 } 553 554 Node = &WalkState->Arguments[Index]; 555 break; 556 557 558 default: 559 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Opcode %d is invalid\n", Opcode)); 560 break; 561 } 562 563 564 return_PTR (Node); 565} 566 567 568/******************************************************************************* 569 * 570 * FUNCTION: AcpiDsMethodDataGetValue 571 * 572 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 573 * Index - Which localVar or argument to get 574 * WalkState - Current walk state object 575 * *DestDesc - Ptr to Descriptor into which selected Arg 576 * or Local value should be copied 577 * 578 * RETURN: Status 579 * 580 * DESCRIPTION: Retrieve value of selected Arg or Local from the method frame 581 * at the current top of the method stack. 582 * Used only in AcpiExResolveToValue(). 583 * 584 ******************************************************************************/ 585 586ACPI_STATUS 587AcpiDsMethodDataGetValue ( 588 UINT16 Opcode, 589 UINT32 Index, 590 ACPI_WALK_STATE *WalkState, 591 ACPI_OPERAND_OBJECT **DestDesc) 592{ 593 ACPI_STATUS Status; 594 ACPI_OPERAND_OBJECT **Entry; 595 ACPI_OPERAND_OBJECT *Object; 596 597 598 FUNCTION_TRACE ("DsMethodDataGetValue"); 599 600 601 /* Validate the object descriptor */ 602 603 if (!DestDesc) 604 { 605 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null object descriptor pointer\n")); 606 return_ACPI_STATUS (AE_BAD_PARAMETER); 607 } 608 609 610 /* Get a pointer to the requested method stack entry */ 611 612 Status = AcpiDsMethodDataGetEntry (Opcode, Index, WalkState, &Entry); 613 if (ACPI_FAILURE (Status)) 614 { 615 return_ACPI_STATUS (Status); 616 } 617 618 /* Get the object from the method stack */ 619 620 Object = *Entry; 621 622 623 /* Examine the returned object, it must be valid. */ 624 625 if (!Object) 626 { 627 /* 628 * Index points to uninitialized object stack value. 629 * This means that either 1) The expected argument was 630 * not passed to the method, or 2) A local variable 631 * was referenced by the method (via the ASL) 632 * before it was initialized. Either case is an error. 633 */ 634 switch (Opcode) 635 { 636 case AML_ARG_OP: 637 638 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Uninitialized Arg[%d] at entry %p\n", 639 Index, Entry)); 640 641 return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG); 642 break; 643 644 case AML_LOCAL_OP: 645 646 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Uninitialized Local[%d] at entry %p\n", 647 Index, Entry)); 648 649 return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL); 650 break; 651 } 652 } 653 654 655 /* 656 * Index points to initialized and valid object stack value. 657 * Return an additional reference to the object 658 */ 659 *DestDesc = Object; 660 AcpiUtAddReference (Object); 661 662 return_ACPI_STATUS (AE_OK); 663} 664 665 666/******************************************************************************* 667 * 668 * FUNCTION: AcpiDsMethodDataDeleteValue 669 * 670 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 671 * Index - Which localVar or argument to delete 672 * WalkState - Current walk state object 673 * 674 * RETURN: Status 675 * 676 * DESCRIPTION: Delete the entry at Opcode:Index on the method stack. Inserts 677 * a null into the stack slot after the object is deleted. 678 * 679 ******************************************************************************/ 680 681ACPI_STATUS 682AcpiDsMethodDataDeleteValue ( 683 UINT16 Opcode, 684 UINT32 Index, 685 ACPI_WALK_STATE *WalkState) 686{ 687 ACPI_STATUS Status; 688 ACPI_OPERAND_OBJECT **Entry; 689 ACPI_OPERAND_OBJECT *Object; 690 691 692 FUNCTION_TRACE ("DsMethodDataDeleteValue"); 693 694 695 /* Get a pointer to the requested entry */ 696 697 Status = AcpiDsMethodDataGetEntry (Opcode, Index, WalkState, &Entry); 698 if (ACPI_FAILURE (Status)) 699 { 700 return_ACPI_STATUS (Status); 701 } 702 703 /* Get the current entry in this slot k */ 704 705 Object = *Entry; 706 707 /* 708 * Undefine the Arg or Local by setting its descriptor 709 * pointer to NULL. Locals/Args can contain both 710 * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs 711 */ 712 *Entry = NULL; 713 714 if ((Object) && 715 (VALID_DESCRIPTOR_TYPE (Object, ACPI_DESC_TYPE_INTERNAL))) 716 { 717 /* 718 * There is a valid object in this slot 719 * Decrement the reference count by one to balance the 720 * increment when the object was stored in the slot. 721 */ 722 AcpiUtRemoveReference (Object); 723 } 724 725 return_ACPI_STATUS (AE_OK); 726} 727 728 729/******************************************************************************* 730 * 731 * FUNCTION: AcpiDsStoreObjectToLocal 732 * 733 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 734 * Index - Which localVar or argument to set 735 * SrcDesc - Value to be stored 736 * WalkState - Current walk state 737 * 738 * RETURN: Status 739 * 740 * DESCRIPTION: Store a value in an Arg or Local. The SrcDesc is installed 741 * as the new value for the Arg or Local and the reference count 742 * for SrcDesc is incremented. 743 * 744 ******************************************************************************/ 745 746ACPI_STATUS 747AcpiDsStoreObjectToLocal ( 748 UINT16 Opcode, 749 UINT32 Index, 750 ACPI_OPERAND_OBJECT *SrcDesc, 751 ACPI_WALK_STATE *WalkState) 752{ 753 ACPI_STATUS Status; 754 ACPI_OPERAND_OBJECT **Entry; 755 756 757 FUNCTION_TRACE ("DsMethodDataSetValue"); 758 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Opcode=%d Idx=%d Obj=%p\n", 759 Opcode, Index, SrcDesc)); 760 761 762 /* Parameter validation */ 763 764 if (!SrcDesc) 765 { 766 return_ACPI_STATUS (AE_BAD_PARAMETER); 767 } 768 769 770 /* Get a pointer to the requested method stack entry */ 771 772 Status = AcpiDsMethodDataGetEntry (Opcode, Index, WalkState, &Entry); 773 if (ACPI_FAILURE (Status)) 774 { 775 goto Cleanup; 776 } 777 778 if (*Entry == SrcDesc) 779 { 780 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p already installed!\n", SrcDesc)); 781 goto Cleanup; 782 } 783 784 785 /* 786 * If there is an object already in this slot, we either 787 * have to delete it, or if this is an argument and there 788 * is an object reference stored there, we have to do 789 * an indirect store! 790 */ 791 if (*Entry) 792 { 793 /* 794 * Check for an indirect store if an argument 795 * contains an object reference (stored as an Node). 796 * We don't allow this automatic dereferencing for 797 * locals, since a store to a local should overwrite 798 * anything there, including an object reference. 799 * 800 * If both Arg0 and Local0 contain RefOf (Local4): 801 * 802 * Store (1, Arg0) - Causes indirect store to local4 803 * Store (1, Local0) - Stores 1 in local0, overwriting 804 * the reference to local4 805 * Store (1, DeRefof (Local0)) - Causes indirect store to local4 806 * 807 * Weird, but true. 808 */ 809 if ((Opcode == AML_ARG_OP) && 810 (VALID_DESCRIPTOR_TYPE (*Entry, ACPI_DESC_TYPE_NAMED))) 811 { 812 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 813 "Arg (%p) is an ObjRef(Node), storing in %p\n", 814 SrcDesc, *Entry)); 815 816 /* Detach an existing object from the Node */ 817 818 AcpiNsDetachObject ((ACPI_NAMESPACE_NODE *) *Entry); 819 820 /* 821 * Store this object into the Node 822 * (do the indirect store) 823 */ 824 Status = AcpiNsAttachObject ((ACPI_NAMESPACE_NODE *) *Entry, SrcDesc, 825 SrcDesc->Common.Type); 826 return_ACPI_STATUS (Status); 827 } 828 829 830#ifdef ACPI_ENABLE_IMPLICIT_CONVERSION 831 /* 832 * Perform "Implicit conversion" of the new object to the type of the 833 * existing object 834 */ 835 Status = AcpiExConvertToTargetType ((*Entry)->Common.Type, &SrcDesc, WalkState); 836 if (ACPI_FAILURE (Status)) 837 { 838 goto Cleanup; 839 } 840#endif 841 842 /* 843 * Delete the existing object 844 * before storing the new one 845 */ 846 AcpiDsMethodDataDeleteValue (Opcode, Index, WalkState); 847 } 848 849 850 /* 851 * Install the ObjStack descriptor (*SrcDesc) into 852 * the descriptor for the Arg or Local. 853 * Install the new object in the stack entry 854 * (increments the object reference count by one) 855 */ 856 Status = AcpiDsMethodDataSetEntry (Opcode, Index, SrcDesc, WalkState); 857 if (ACPI_FAILURE (Status)) 858 { 859 goto Cleanup; 860 } 861 862 /* Normal exit */ 863 864 return_ACPI_STATUS (AE_OK); 865 866 867 /* Error exit */ 868 869Cleanup: 870 871 return_ACPI_STATUS (Status); 872} 873 874