dsmthdat.c revision 70243
1/******************************************************************************* 2 * 3 * Module Name: dsmthdat - control method arguments and local variables 4 * $Revision: 37 $ 5 * 6 ******************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999, 2000, 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 DISPATCHER 128 MODULE_NAME ("dsmthdat") 129 130 131/******************************************************************************* 132 * 133 * FUNCTION: AcpiDsMethodDataInit 134 * 135 * PARAMETERS: *ObjDesc 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 * AcpiCmCallocate(). 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: None 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 DEBUG_PRINT (ACPI_INFO, 219 ("MethodDeleteAll: Deleting local variables in %p\n", WalkState)); 220 221 for (Index = 0; Index < MTH_NUM_LOCALS; Index++) 222 { 223 Object = WalkState->LocalVariables[Index].Object; 224 if (Object) 225 { 226 DEBUG_PRINT (TRACE_EXEC, 227 ("MethodDeleteAll: Deleting Local%d=%p\n", Index, Object)); 228 229 /* Remove first */ 230 231 WalkState->LocalVariables[Index].Object = NULL; 232 233 /* Was given a ref when stored */ 234 235 AcpiCmRemoveReference (Object); 236 } 237 } 238 239 240 /* Delete the arguments */ 241 242 DEBUG_PRINT (ACPI_INFO, 243 ("MethodDeleteAll: Deleting arguments in %p\n", WalkState)); 244 245 for (Index = 0; Index < MTH_NUM_ARGS; Index++) 246 { 247 Object = WalkState->Arguments[Index].Object; 248 if (Object) 249 { 250 DEBUG_PRINT (TRACE_EXEC, 251 ("MethodDeleteAll: Deleting Arg%d=%p\n", Index, Object)); 252 253 /* Remove first */ 254 255 WalkState->Arguments[Index].Object = NULL; 256 257 /* Was given a ref when stored */ 258 259 AcpiCmRemoveReference (Object); 260 } 261 } 262 263 return_ACPI_STATUS (AE_OK); 264} 265 266 267/******************************************************************************* 268 * 269 * FUNCTION: AcpiDsMethodDataInitArgs 270 * 271 * PARAMETERS: None 272 * 273 * RETURN: Status 274 * 275 * DESCRIPTION: Initialize arguments for a method 276 * 277 ******************************************************************************/ 278 279ACPI_STATUS 280AcpiDsMethodDataInitArgs ( 281 ACPI_OPERAND_OBJECT **Params, 282 UINT32 MaxParamCount, 283 ACPI_WALK_STATE *WalkState) 284{ 285 ACPI_STATUS Status; 286 UINT32 Mindex; 287 UINT32 Pindex; 288 289 290 FUNCTION_TRACE_PTR ("DsMethodDataInitArgs", Params); 291 292 293 if (!Params) 294 { 295 DEBUG_PRINT (TRACE_EXEC, 296 ("DsMethodDataInitArgs: No param list passed to method\n")); 297 return_ACPI_STATUS (AE_OK); 298 } 299 300 /* Copy passed parameters into the new method stack frame */ 301 302 for (Pindex = Mindex = 0; 303 (Mindex < MTH_NUM_ARGS) && (Pindex < MaxParamCount); 304 Mindex++) 305 { 306 if (Params[Pindex]) 307 { 308 /* 309 * A valid parameter. 310 * Set the current method argument to the 311 * Params[Pindex++] argument object descriptor 312 */ 313 Status = AcpiDsMethodDataSetValue (MTH_TYPE_ARG, Mindex, 314 Params[Pindex], WalkState); 315 if (ACPI_FAILURE (Status)) 316 { 317 break; 318 } 319 320 Pindex++; 321 } 322 323 else 324 { 325 break; 326 } 327 } 328 329 DEBUG_PRINT (TRACE_EXEC, 330 ("DsMethodDataInitArgs: %d args passed to method\n", Pindex)); 331 return_ACPI_STATUS (AE_OK); 332} 333 334 335/******************************************************************************* 336 * 337 * FUNCTION: AcpiDsMethodDataGetEntry 338 * 339 * PARAMETERS: Type - Either MTH_TYPE_LOCAL or MTH_TYPE_ARG 340 * Index - Which localVar or argument to get 341 * Entry - Pointer to where a pointer to the stack 342 * entry is returned. 343 * 344 * RETURN: Status 345 * 346 * DESCRIPTION: Get the address of the stack entry given by Type:Index 347 * 348 ******************************************************************************/ 349 350ACPI_STATUS 351AcpiDsMethodDataGetEntry ( 352 UINT32 Type, 353 UINT32 Index, 354 ACPI_WALK_STATE *WalkState, 355 ACPI_OPERAND_OBJECT ***Entry) 356{ 357 358 FUNCTION_TRACE_U32 ("DsMethodDataGetEntry", Index); 359 360 361 /* 362 * Get the requested object. 363 * The stack "Type" is either a LocalVariable or an Argument 364 */ 365 366 switch (Type) 367 { 368 369 case MTH_TYPE_LOCAL: 370 371 if (Index > MTH_MAX_LOCAL) 372 { 373 DEBUG_PRINT (ACPI_ERROR, 374 ("DsMethodDataGetEntry: LocalVar index %d is invalid (max %d)\n", 375 Index, MTH_MAX_LOCAL)); 376 return_ACPI_STATUS (AE_BAD_PARAMETER); 377 } 378 379 *Entry = 380 (ACPI_OPERAND_OBJECT **) &WalkState->LocalVariables[Index].Object; 381 break; 382 383 384 case MTH_TYPE_ARG: 385 386 if (Index > MTH_MAX_ARG) 387 { 388 DEBUG_PRINT (ACPI_ERROR, 389 ("DsMethodDataGetEntry: Argument index %d is invalid (max %d)\n", 390 Index, MTH_MAX_ARG)); 391 return_ACPI_STATUS (AE_BAD_PARAMETER); 392 } 393 394 *Entry = 395 (ACPI_OPERAND_OBJECT **) &WalkState->Arguments[Index].Object; 396 break; 397 398 399 default: 400 DEBUG_PRINT (ACPI_ERROR, 401 ("DsMethodDataGetEntry: Stack type %d is invalid\n", 402 Type)); 403 return_ACPI_STATUS (AE_BAD_PARAMETER); 404 } 405 406 407 return_ACPI_STATUS (AE_OK); 408} 409 410 411/******************************************************************************* 412 * 413 * FUNCTION: AcpiDsMethodDataSetEntry 414 * 415 * PARAMETERS: Type - Either MTH_TYPE_LOCAL or MTH_TYPE_ARG 416 * Index - Which localVar or argument to get 417 * Object - Object to be inserted into the stack entry 418 * 419 * RETURN: Status 420 * 421 * DESCRIPTION: Insert an object onto the method stack at entry Type:Index. 422 * 423 ******************************************************************************/ 424 425ACPI_STATUS 426AcpiDsMethodDataSetEntry ( 427 UINT32 Type, 428 UINT32 Index, 429 ACPI_OPERAND_OBJECT *Object, 430 ACPI_WALK_STATE *WalkState) 431{ 432 ACPI_STATUS Status; 433 ACPI_OPERAND_OBJECT **Entry; 434 435 436 FUNCTION_TRACE ("DsMethodDataSetEntry"); 437 438 /* Get a pointer to the stack entry to set */ 439 440 Status = AcpiDsMethodDataGetEntry (Type, Index, WalkState, &Entry); 441 if (ACPI_FAILURE (Status)) 442 { 443 return_ACPI_STATUS (Status); 444 } 445 446 /* Increment ref count so object can't be deleted while installed */ 447 448 AcpiCmAddReference (Object); 449 450 /* Install the object into the stack entry */ 451 452 *Entry = Object; 453 454 return_ACPI_STATUS (AE_OK); 455} 456 457 458/******************************************************************************* 459 * 460 * FUNCTION: AcpiDsMethodDataGetType 461 * 462 * PARAMETERS: Type - Either MTH_TYPE_LOCAL or MTH_TYPE_ARG 463 * Index - Which localVar or argument whose type 464 * to get 465 * 466 * RETURN: Data type of selected Arg or Local 467 * Used only in ExecMonadic2()/TypeOp. 468 * 469 ******************************************************************************/ 470 471OBJECT_TYPE_INTERNAL 472AcpiDsMethodDataGetType ( 473 UINT32 Type, 474 UINT32 Index, 475 ACPI_WALK_STATE *WalkState) 476{ 477 ACPI_STATUS Status; 478 ACPI_OPERAND_OBJECT **Entry; 479 ACPI_OPERAND_OBJECT *Object; 480 481 482 FUNCTION_TRACE ("DsMethodDataGetType"); 483 484 485 /* Get a pointer to the requested stack entry */ 486 487 Status = AcpiDsMethodDataGetEntry (Type, Index, WalkState, &Entry); 488 if (ACPI_FAILURE (Status)) 489 { 490 return_VALUE ((ACPI_TYPE_NOT_FOUND)); 491 } 492 493 /* Get the object from the method stack */ 494 495 Object = *Entry; 496 497 /* Get the object type */ 498 499 if (!Object) 500 { 501 /* Any == 0 => "uninitialized" -- see spec 15.2.3.5.2.28 */ 502 return_VALUE (ACPI_TYPE_ANY); 503 } 504 505 return_VALUE (Object->Common.Type); 506} 507 508 509/******************************************************************************* 510 * 511 * FUNCTION: AcpiDsMethodDataGetNte 512 * 513 * PARAMETERS: Type - Either MTH_TYPE_LOCAL or MTH_TYPE_ARG 514 * Index - Which localVar or argument whose type 515 * to get 516 * 517 * RETURN: Get the Node associated with a local or arg. 518 * 519 ******************************************************************************/ 520 521ACPI_NAMESPACE_NODE * 522AcpiDsMethodDataGetNte ( 523 UINT32 Type, 524 UINT32 Index, 525 ACPI_WALK_STATE *WalkState) 526{ 527 ACPI_NAMESPACE_NODE *Node = NULL; 528 529 530 FUNCTION_TRACE ("DsMethodDataGetNte"); 531 532 533 switch (Type) 534 { 535 536 case MTH_TYPE_LOCAL: 537 538 if (Index > MTH_MAX_LOCAL) 539 { 540 DEBUG_PRINT (ACPI_ERROR, 541 ("DsMethodDataGetEntry: LocalVar index %d is invalid (max %d)\n", 542 Index, MTH_MAX_LOCAL)); 543 return_PTR (Node); 544 } 545 546 Node = &WalkState->LocalVariables[Index]; 547 break; 548 549 550 case MTH_TYPE_ARG: 551 552 if (Index > MTH_MAX_ARG) 553 { 554 DEBUG_PRINT (ACPI_ERROR, 555 ("DsMethodDataGetEntry: Argument index %d is invalid (max %d)\n", 556 Index, MTH_MAX_ARG)); 557 return_PTR (Node); 558 } 559 560 Node = &WalkState->Arguments[Index]; 561 break; 562 563 564 default: 565 DEBUG_PRINT (ACPI_ERROR, 566 ("DsMethodDataGetEntry: Stack type %d is invalid\n", 567 Type)); 568 break; 569 } 570 571 572 return_PTR (Node); 573} 574 575 576/******************************************************************************* 577 * 578 * FUNCTION: AcpiDsMethodDataGetValue 579 * 580 * PARAMETERS: Type - Either MTH_TYPE_LOCAL or MTH_TYPE_ARG 581 * Index - Which localVar or argument to get 582 * *DestDesc - Descriptor into which selected Arg 583 * or Local value should be copied 584 * 585 * RETURN: Status 586 * 587 * DESCRIPTION: Retrieve value of selected Arg or Local from the method frame 588 * at the current top of the method stack. 589 * Used only in AcpiAmlResolveToValue(). 590 * 591 ******************************************************************************/ 592 593ACPI_STATUS 594AcpiDsMethodDataGetValue ( 595 UINT32 Type, 596 UINT32 Index, 597 ACPI_WALK_STATE *WalkState, 598 ACPI_OPERAND_OBJECT **DestDesc) 599{ 600 ACPI_STATUS Status; 601 ACPI_OPERAND_OBJECT **Entry; 602 ACPI_OPERAND_OBJECT *Object; 603 604 605 FUNCTION_TRACE ("DsMethodDataGetValue"); 606 607 608 /* Validate the object descriptor */ 609 610 if (!DestDesc) 611 { 612 DEBUG_PRINT (ACPI_ERROR, 613 ("DsMethodDataGetValue: NULL object descriptor pointer\n")); 614 return_ACPI_STATUS (AE_BAD_PARAMETER); 615 } 616 617 618 /* Get a pointer to the requested method stack entry */ 619 620 Status = AcpiDsMethodDataGetEntry (Type, Index, WalkState, &Entry); 621 if (ACPI_FAILURE (Status)) 622 { 623 return_ACPI_STATUS (Status); 624 } 625 626 /* Get the object from the method stack */ 627 628 Object = *Entry; 629 630 631 /* Examine the returned object, it must be valid. */ 632 633 if (!Object) 634 { 635 /* 636 * Index points to uninitialized object stack value. 637 * This means that either 1) The expected argument was 638 * not passed to the method, or 2) A local variable 639 * was referenced by the method (via the ASL) 640 * before it was initialized. Either case is an error. 641 */ 642 643 switch (Type) 644 { 645 case MTH_TYPE_ARG: 646 DEBUG_PRINT (ACPI_ERROR, 647 ("DsMethodDataGetValue: Uninitialized Arg[%d] at entry %p\n", 648 Index, Entry)); 649 return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG); 650 break; 651 652 case MTH_TYPE_LOCAL: 653 DEBUG_PRINT (ACPI_ERROR, 654 ("DsMethodDataGetValue: Uninitialized Local[%d] at entry %p\n", 655 Index, Entry)); 656 return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL); 657 break; 658 } 659 } 660 661 662 /* 663 * Index points to initialized and valid object stack value. 664 * Return an additional reference to the object 665 */ 666 667 *DestDesc = Object; 668 AcpiCmAddReference (Object); 669 670 return_ACPI_STATUS (AE_OK); 671} 672 673 674/******************************************************************************* 675 * 676 * FUNCTION: AcpiDsMethodDataDeleteValue 677 * 678 * PARAMETERS: Type - Either MTH_TYPE_LOCAL or MTH_TYPE_ARG 679 * Index - Which localVar or argument to delete 680 * 681 * RETURN: Status 682 * 683 * DESCRIPTION: Delete the entry at Type:Index on the method stack. Inserts 684 * a null into the stack slot after the object is deleted. 685 * 686 ******************************************************************************/ 687 688ACPI_STATUS 689AcpiDsMethodDataDeleteValue ( 690 UINT32 Type, 691 UINT32 Index, 692 ACPI_WALK_STATE *WalkState) 693{ 694 ACPI_STATUS Status; 695 ACPI_OPERAND_OBJECT **Entry; 696 ACPI_OPERAND_OBJECT *Object; 697 698 699 FUNCTION_TRACE ("DsMethodDataDeleteValue"); 700 701 702 /* Get a pointer to the requested entry */ 703 704 Status = AcpiDsMethodDataGetEntry (Type, Index, WalkState, &Entry); 705 if (ACPI_FAILURE (Status)) 706 { 707 return_ACPI_STATUS (Status); 708 } 709 710 /* Get the current entry in this slot k */ 711 712 Object = *Entry; 713 714 /* 715 * Undefine the Arg or Local by setting its descriptor 716 * pointer to NULL. Locals/Args can contain both 717 * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs 718 */ 719 *Entry = NULL; 720 721 722 if ((Object) && 723 (VALID_DESCRIPTOR_TYPE (Object, ACPI_DESC_TYPE_INTERNAL))) 724 { 725 /* 726 * There is a valid object in this slot 727 * Decrement the reference count by one to balance the 728 * increment when the object was stored in the slot. 729 */ 730 731 AcpiCmRemoveReference (Object); 732 } 733 734 735 return_ACPI_STATUS (AE_OK); 736} 737 738 739/******************************************************************************* 740 * 741 * FUNCTION: AcpiDsMethodDataSetValue 742 * 743 * PARAMETERS: Type - Either MTH_TYPE_LOCAL or MTH_TYPE_ARG 744 * Index - Which localVar or argument to set 745 * *SrcDesc - Value to be stored 746 * *DestDesc - Descriptor into which *SrcDesc 747 * can be copied, or NULL if one must 748 * be allocated for the purpose. If 749 * provided, this descriptor will be 750 * used for the new value. 751 * 752 * RETURN: Status 753 * 754 * DESCRIPTION: Store a value in an Arg or Local. The SrcDesc is installed 755 * as the new value for the Arg or Local and the reference count 756 * is incremented. 757 * 758 ******************************************************************************/ 759 760ACPI_STATUS 761AcpiDsMethodDataSetValue ( 762 UINT32 Type, 763 UINT32 Index, 764 ACPI_OPERAND_OBJECT *SrcDesc, 765 ACPI_WALK_STATE *WalkState) 766{ 767 ACPI_STATUS Status; 768 ACPI_OPERAND_OBJECT **Entry; 769 770 771 FUNCTION_TRACE ("DsMethodDataSetValue"); 772 DEBUG_PRINT (TRACE_EXEC, 773 ("DsMethodDataSetValue: Type=%d Idx=%d Obj=%p\n", 774 Type, Index, SrcDesc)); 775 776 777 /* Parameter validation */ 778 779 if (!SrcDesc) 780 { 781 return_ACPI_STATUS (AE_BAD_PARAMETER); 782 } 783 784 785 /* Get a pointer to the requested method stack entry */ 786 787 Status = AcpiDsMethodDataGetEntry (Type, Index, WalkState, &Entry); 788 if (ACPI_FAILURE (Status)) 789 { 790 goto Cleanup; 791 } 792 793 if (*Entry == SrcDesc) 794 { 795 DEBUG_PRINT (TRACE_EXEC, 796 ("DsMethodDataSetValue: Obj=%p already installed!\n", 797 SrcDesc)); 798 goto Cleanup; 799 } 800 801 802 /* 803 * If there is an object already in this slot, we either 804 * have to delete it, or if this is an argument and there 805 * is an object reference stored there, we have to do 806 * an indirect store! 807 */ 808 809 if (*Entry) 810 { 811 /* 812 * Check for an indirect store if an argument 813 * contains an object reference (stored as an Node). 814 * We don't allow this automatic dereferencing for 815 * locals, since a store to a local should overwrite 816 * anything there, including an object reference. 817 * 818 * If both Arg0 and Local0 contain RefOf (Local4): 819 * 820 * Store (1, Arg0) - Causes indirect store to local4 821 * Store (1, Local0) - Stores 1 in local0, overwriting 822 * the reference to local4 823 * Store (1, DeRefof (Local0)) - Causes indirect store to local4 824 * 825 * Weird, but true. 826 */ 827 828 if ((Type == MTH_TYPE_ARG) && 829 (VALID_DESCRIPTOR_TYPE (*Entry, ACPI_DESC_TYPE_NAMED))) 830 { 831 DEBUG_PRINT (TRACE_EXEC, 832 ("DsMethodDataSetValue: Arg (%p) is an ObjRef(Node), storing in %p\n", 833 SrcDesc, *Entry)); 834 835 /* Detach an existing object from the Node */ 836 837 AcpiNsDetachObject ((ACPI_NAMESPACE_NODE *) *Entry); 838 839 /* 840 * Store this object into the Node 841 * (do the indirect store) 842 */ 843 844 Status = AcpiNsAttachObject ((ACPI_NAMESPACE_NODE *) *Entry, SrcDesc, 845 SrcDesc->Common.Type); 846 return_ACPI_STATUS (Status); 847 } 848 849 850 /* 851 * Otherwise, just delete the existing object 852 * before storing the new one 853 */ 854 855 AcpiDsMethodDataDeleteValue (Type, Index, WalkState); 856 } 857 858 859 /* 860 * Install the ObjStack descriptor (*SrcDesc) into 861 * the descriptor for the Arg or Local. 862 * Install the new object in the stack entry 863 * (increments the object reference count by one) 864 */ 865 866 Status = AcpiDsMethodDataSetEntry (Type, Index, SrcDesc, WalkState); 867 if (ACPI_FAILURE (Status)) 868 { 869 goto Cleanup; 870 } 871 872 /* Normal exit */ 873 874 return_ACPI_STATUS (AE_OK); 875 876 877 /* Error exit */ 878 879Cleanup: 880 881 return_ACPI_STATUS (Status); 882} 883 884