dsmthdat.c revision 99679
1/******************************************************************************* 2 * 3 * Module Name: dsmthdat - control method arguments and local variables 4 * $Revision: 62 $ 5 * 6 ******************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2002, 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 "acdispat.h" 121#include "amlcode.h" 122#include "acnamesp.h" 123 124 125#define _COMPONENT ACPI_DISPATCHER 126 ACPI_MODULE_NAME ("dsmthdat") 127 128 129/******************************************************************************* 130 * 131 * FUNCTION: AcpiDsMethodDataInit 132 * 133 * PARAMETERS: WalkState - Current walk state object 134 * 135 * RETURN: Status 136 * 137 * DESCRIPTION: Initialize the data structures that hold the method's arguments 138 * and locals. The data struct is an array of NTEs for each. 139 * This allows RefOf and DeRefOf to work properly for these 140 * special data types. 141 * 142 * NOTES: WalkState fields are initialized to zero by the 143 * ACPI_MEM_CALLOCATE(). 144 * 145 * A pseudo-Namespace Node is assigned to each argument and local 146 * so that RefOf() can return a pointer to the Node. 147 * 148 ******************************************************************************/ 149 150void 151AcpiDsMethodDataInit ( 152 ACPI_WALK_STATE *WalkState) 153{ 154 UINT32 i; 155 156 157 ACPI_FUNCTION_TRACE ("DsMethodDataInit"); 158 159 160 /* Init the method arguments */ 161 162 for (i = 0; i < MTH_NUM_ARGS; i++) 163 { 164 ACPI_MOVE_UNALIGNED32_TO_32 (&WalkState->Arguments[i].Name, 165 NAMEOF_ARG_NTE); 166 WalkState->Arguments[i].Name.Integer |= (i << 24); 167 WalkState->Arguments[i].Descriptor = ACPI_DESC_TYPE_NAMED; 168 WalkState->Arguments[i].Type = ACPI_TYPE_ANY; 169 WalkState->Arguments[i].Flags = ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_ARG; 170 } 171 172 /* Init the method locals */ 173 174 for (i = 0; i < MTH_NUM_LOCALS; i++) 175 { 176 ACPI_MOVE_UNALIGNED32_TO_32 (&WalkState->LocalVariables[i].Name, 177 NAMEOF_LOCAL_NTE); 178 179 WalkState->LocalVariables[i].Name.Integer |= (i << 24); 180 WalkState->LocalVariables[i].Descriptor = ACPI_DESC_TYPE_NAMED; 181 WalkState->LocalVariables[i].Type = ACPI_TYPE_ANY; 182 WalkState->LocalVariables[i].Flags = ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_LOCAL; 183 } 184 185 return_VOID; 186} 187 188 189/******************************************************************************* 190 * 191 * FUNCTION: AcpiDsMethodDataDeleteAll 192 * 193 * PARAMETERS: WalkState - Current walk state object 194 * 195 * RETURN: None 196 * 197 * DESCRIPTION: Delete method locals and arguments. Arguments are only 198 * deleted if this method was called from another method. 199 * 200 ******************************************************************************/ 201 202void 203AcpiDsMethodDataDeleteAll ( 204 ACPI_WALK_STATE *WalkState) 205{ 206 UINT32 Index; 207 208 209 ACPI_FUNCTION_TRACE ("DsMethodDataDeleteAll"); 210 211 212 /* Detach the locals */ 213 214 for (Index = 0; Index < MTH_NUM_LOCALS; Index++) 215 { 216 if (WalkState->LocalVariables[Index].Object) 217 { 218 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%d=%p\n", 219 Index, WalkState->LocalVariables[Index].Object)); 220 221 /* Detach object (if present) and remove a reference */ 222 223 AcpiNsDetachObject (&WalkState->LocalVariables[Index]); 224 } 225 } 226 227 /* Detach the arguments */ 228 229 for (Index = 0; Index < MTH_NUM_ARGS; Index++) 230 { 231 if (WalkState->Arguments[Index].Object) 232 { 233 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%d=%p\n", 234 Index, WalkState->Arguments[Index].Object)); 235 236 /* Detach object (if present) and remove a reference */ 237 238 AcpiNsDetachObject (&WalkState->Arguments[Index]); 239 } 240 } 241 242 return_VOID; 243} 244 245 246/******************************************************************************* 247 * 248 * FUNCTION: AcpiDsMethodDataInitArgs 249 * 250 * PARAMETERS: *Params - Pointer to a parameter list for the method 251 * MaxParamCount - The arg count for this method 252 * WalkState - Current walk state object 253 * 254 * RETURN: Status 255 * 256 * DESCRIPTION: Initialize arguments for a method. The parameter list is a list 257 * of ACPI operand objects, either null terminated or whose length 258 * is defined by MaxParamCount. 259 * 260 ******************************************************************************/ 261 262ACPI_STATUS 263AcpiDsMethodDataInitArgs ( 264 ACPI_OPERAND_OBJECT **Params, 265 UINT32 MaxParamCount, 266 ACPI_WALK_STATE *WalkState) 267{ 268 ACPI_STATUS Status; 269 UINT32 Index = 0; 270 271 272 ACPI_FUNCTION_TRACE_PTR ("DsMethodDataInitArgs", Params); 273 274 275 if (!Params) 276 { 277 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "No param list passed to method\n")); 278 return_ACPI_STATUS (AE_OK); 279 } 280 281 /* Copy passed parameters into the new method stack frame */ 282 283 while ((Index < MTH_NUM_ARGS) && (Index < MaxParamCount) && Params[Index]) 284 { 285 /* 286 * A valid parameter. 287 * Store the argument in the method/walk descriptor 288 */ 289 Status = AcpiDsStoreObjectToLocal (AML_ARG_OP, Index, Params[Index], 290 WalkState); 291 if (ACPI_FAILURE (Status)) 292 { 293 return_ACPI_STATUS (Status); 294 } 295 296 Index++; 297 } 298 299 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%d args passed to method\n", Index)); 300 return_ACPI_STATUS (AE_OK); 301} 302 303 304/******************************************************************************* 305 * 306 * FUNCTION: AcpiDsMethodDataGetNode 307 * 308 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 309 * Index - Which localVar or argument whose type 310 * to get 311 * WalkState - Current walk state object 312 * 313 * RETURN: Get the Node associated with a local or arg. 314 * 315 ******************************************************************************/ 316 317ACPI_STATUS 318AcpiDsMethodDataGetNode ( 319 UINT16 Opcode, 320 UINT32 Index, 321 ACPI_WALK_STATE *WalkState, 322 ACPI_NAMESPACE_NODE **Node) 323{ 324 ACPI_FUNCTION_TRACE ("DsMethodDataGetNode"); 325 326 327 /* 328 * Method Locals and Arguments are supported 329 */ 330 switch (Opcode) 331 { 332 case AML_LOCAL_OP: 333 334 if (Index > MTH_MAX_LOCAL) 335 { 336 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Local index %d is invalid (max %d)\n", 337 Index, MTH_MAX_LOCAL)); 338 return_ACPI_STATUS (AE_AML_INVALID_INDEX); 339 } 340 341 /* Return a pointer to the pseudo-node */ 342 343 *Node = &WalkState->LocalVariables[Index]; 344 break; 345 346 case AML_ARG_OP: 347 348 if (Index > MTH_MAX_ARG) 349 { 350 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Arg index %d is invalid (max %d)\n", 351 Index, MTH_MAX_ARG)); 352 return_ACPI_STATUS (AE_AML_INVALID_INDEX); 353 } 354 355 /* Return a pointer to the pseudo-node */ 356 357 *Node = &WalkState->Arguments[Index]; 358 break; 359 360 default: 361 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Opcode %d is invalid\n", Opcode)); 362 return_ACPI_STATUS (AE_AML_BAD_OPCODE); 363 } 364 365 return_ACPI_STATUS (AE_OK); 366} 367 368 369/******************************************************************************* 370 * 371 * FUNCTION: AcpiDsMethodDataSetValue 372 * 373 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 374 * Index - Which localVar or argument to get 375 * Object - Object to be inserted into the stack entry 376 * WalkState - Current walk state object 377 * 378 * RETURN: Status 379 * 380 * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index. 381 * 382 ******************************************************************************/ 383 384ACPI_STATUS 385AcpiDsMethodDataSetValue ( 386 UINT16 Opcode, 387 UINT32 Index, 388 ACPI_OPERAND_OBJECT *Object, 389 ACPI_WALK_STATE *WalkState) 390{ 391 ACPI_STATUS Status; 392 ACPI_NAMESPACE_NODE *Node; 393 394 395 ACPI_FUNCTION_TRACE ("DsMethodDataSetValue"); 396 397 398 /* Get the namespace node for the arg/local */ 399 400 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 401 if (ACPI_FAILURE (Status)) 402 { 403 return_ACPI_STATUS (Status); 404 } 405 406 /* Increment ref count so object can't be deleted while installed */ 407 408 AcpiUtAddReference (Object); 409 410 /* Install the object into the stack entry */ 411 412 Node->Object = Object; 413 return_ACPI_STATUS (AE_OK); 414} 415 416 417/******************************************************************************* 418 * 419 * FUNCTION: AcpiDsMethodDataGetType 420 * 421 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 422 * Index - Which localVar or argument whose type 423 * to get 424 * WalkState - Current walk state object 425 * 426 * RETURN: Data type of current value of the selected Arg or Local 427 * 428 ******************************************************************************/ 429 430ACPI_OBJECT_TYPE 431AcpiDsMethodDataGetType ( 432 UINT16 Opcode, 433 UINT32 Index, 434 ACPI_WALK_STATE *WalkState) 435{ 436 ACPI_STATUS Status; 437 ACPI_NAMESPACE_NODE *Node; 438 ACPI_OPERAND_OBJECT *Object; 439 440 441 ACPI_FUNCTION_TRACE ("DsMethodDataGetType"); 442 443 444 /* Get the namespace node for the arg/local */ 445 446 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 447 if (ACPI_FAILURE (Status)) 448 { 449 return_VALUE ((ACPI_TYPE_NOT_FOUND)); 450 } 451 452 /* Get the object */ 453 454 Object = AcpiNsGetAttachedObject (Node); 455 if (!Object) 456 { 457 /* Uninitialized local/arg, return TYPE_ANY */ 458 459 return_VALUE (ACPI_TYPE_ANY); 460 } 461 462 /* Get the object type */ 463 464 return_VALUE (ACPI_GET_OBJECT_TYPE (Object)); 465} 466 467 468/******************************************************************************* 469 * 470 * FUNCTION: AcpiDsMethodDataGetValue 471 * 472 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 473 * Index - Which localVar or argument to get 474 * WalkState - Current walk state object 475 * *DestDesc - Ptr to Descriptor into which selected Arg 476 * or Local value should be copied 477 * 478 * RETURN: Status 479 * 480 * DESCRIPTION: Retrieve value of selected Arg or Local from the method frame 481 * at the current top of the method stack. 482 * Used only in AcpiExResolveToValue(). 483 * 484 ******************************************************************************/ 485 486ACPI_STATUS 487AcpiDsMethodDataGetValue ( 488 UINT16 Opcode, 489 UINT32 Index, 490 ACPI_WALK_STATE *WalkState, 491 ACPI_OPERAND_OBJECT **DestDesc) 492{ 493 ACPI_STATUS Status; 494 ACPI_NAMESPACE_NODE *Node; 495 ACPI_OPERAND_OBJECT *Object; 496 497 498 ACPI_FUNCTION_TRACE ("DsMethodDataGetValue"); 499 500 501 /* Validate the object descriptor */ 502 503 if (!DestDesc) 504 { 505 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null object descriptor pointer\n")); 506 return_ACPI_STATUS (AE_BAD_PARAMETER); 507 } 508 509 /* Get the namespace node for the arg/local */ 510 511 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 512 if (ACPI_FAILURE (Status)) 513 { 514 return_ACPI_STATUS (Status); 515 } 516 517 /* Get the object from the node */ 518 519 Object = Node->Object; 520 521 /* Examine the returned object, it must be valid. */ 522 523 if (!Object) 524 { 525 /* 526 * Index points to uninitialized object. 527 * This means that either 1) The expected argument was 528 * not passed to the method, or 2) A local variable 529 * was referenced by the method (via the ASL) 530 * before it was initialized. Either case is an error. 531 */ 532 switch (Opcode) 533 { 534 case AML_ARG_OP: 535 536 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Uninitialized Arg[%d] at node %p\n", 537 Index, Node)); 538 539 return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG); 540 541 case AML_LOCAL_OP: 542 543 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Uninitialized Local[%d] at node %p\n", 544 Index, Node)); 545 546 return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL); 547 548 default: 549 return_ACPI_STATUS (AE_AML_INTERNAL); 550 } 551 } 552 553 /* 554 * The Index points to an initialized and valid object. 555 * Return an additional reference to the object 556 */ 557 *DestDesc = Object; 558 AcpiUtAddReference (Object); 559 560 return_ACPI_STATUS (AE_OK); 561} 562 563 564/******************************************************************************* 565 * 566 * FUNCTION: AcpiDsMethodDataDeleteValue 567 * 568 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 569 * Index - Which localVar or argument to delete 570 * WalkState - Current walk state object 571 * 572 * RETURN: None 573 * 574 * DESCRIPTION: Delete the entry at Opcode:Index on the method stack. Inserts 575 * a null into the stack slot after the object is deleted. 576 * 577 ******************************************************************************/ 578 579void 580AcpiDsMethodDataDeleteValue ( 581 UINT16 Opcode, 582 UINT32 Index, 583 ACPI_WALK_STATE *WalkState) 584{ 585 ACPI_STATUS Status; 586 ACPI_NAMESPACE_NODE *Node; 587 ACPI_OPERAND_OBJECT *Object; 588 589 590 ACPI_FUNCTION_TRACE ("DsMethodDataDeleteValue"); 591 592 593 /* Get the namespace node for the arg/local */ 594 595 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 596 if (ACPI_FAILURE (Status)) 597 { 598 return_VOID; 599 } 600 601 /* Get the associated object */ 602 603 Object = AcpiNsGetAttachedObject (Node); 604 605 /* 606 * Undefine the Arg or Local by setting its descriptor 607 * pointer to NULL. Locals/Args can contain both 608 * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs 609 */ 610 Node->Object = NULL; 611 612 if ((Object) && 613 (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_OPERAND)) 614 { 615 /* 616 * There is a valid object. 617 * Decrement the reference count by one to balance the 618 * increment when the object was stored. 619 */ 620 AcpiUtRemoveReference (Object); 621 } 622 623 return_VOID; 624} 625 626 627/******************************************************************************* 628 * 629 * FUNCTION: AcpiDsStoreObjectToLocal 630 * 631 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 632 * Index - Which localVar or argument to set 633 * ObjDesc - Value to be stored 634 * WalkState - Current walk state 635 * 636 * RETURN: Status 637 * 638 * DESCRIPTION: Store a value in an Arg or Local. The ObjDesc is installed 639 * as the new value for the Arg or Local and the reference count 640 * for ObjDesc is incremented. 641 * 642 ******************************************************************************/ 643 644ACPI_STATUS 645AcpiDsStoreObjectToLocal ( 646 UINT16 Opcode, 647 UINT32 Index, 648 ACPI_OPERAND_OBJECT *ObjDesc, 649 ACPI_WALK_STATE *WalkState) 650{ 651 ACPI_STATUS Status; 652 ACPI_NAMESPACE_NODE *Node; 653 ACPI_OPERAND_OBJECT *CurrentObjDesc; 654 655 656 ACPI_FUNCTION_TRACE ("DsStoreObjectToLocal"); 657 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Opcode=%d Idx=%d Obj=%p\n", 658 Opcode, Index, ObjDesc)); 659 660 661 /* Parameter validation */ 662 663 if (!ObjDesc) 664 { 665 return_ACPI_STATUS (AE_BAD_PARAMETER); 666 } 667 668 /* Get the namespace node for the arg/local */ 669 670 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 671 if (ACPI_FAILURE (Status)) 672 { 673 return_ACPI_STATUS (Status); 674 } 675 676 CurrentObjDesc = AcpiNsGetAttachedObject (Node); 677 if (CurrentObjDesc == ObjDesc) 678 { 679 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p already installed!\n", ObjDesc)); 680 return_ACPI_STATUS (Status); 681 } 682 683 /* 684 * If there is an object already in this slot, we either 685 * have to delete it, or if this is an argument and there 686 * is an object reference stored there, we have to do 687 * an indirect store! 688 */ 689 if (CurrentObjDesc) 690 { 691 /* 692 * Check for an indirect store if an argument 693 * contains an object reference (stored as an Node). 694 * We don't allow this automatic dereferencing for 695 * locals, since a store to a local should overwrite 696 * anything there, including an object reference. 697 * 698 * If both Arg0 and Local0 contain RefOf (Local4): 699 * 700 * Store (1, Arg0) - Causes indirect store to local4 701 * Store (1, Local0) - Stores 1 in local0, overwriting 702 * the reference to local4 703 * Store (1, DeRefof (Local0)) - Causes indirect store to local4 704 * 705 * Weird, but true. 706 */ 707 if ((Opcode == AML_ARG_OP) && 708 (ACPI_GET_DESCRIPTOR_TYPE (CurrentObjDesc) == ACPI_DESC_TYPE_NAMED)) 709 { 710 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 711 "Arg (%p) is an ObjRef(Node), storing in node %p\n", 712 ObjDesc, CurrentObjDesc)); 713 714 /* Detach an existing object from the Node */ 715 716 AcpiNsDetachObject ((ACPI_NAMESPACE_NODE *) CurrentObjDesc); 717 718 /* 719 * Store this object into the Node 720 * (perform the indirect store) 721 */ 722 Status = AcpiNsAttachObject ((ACPI_NAMESPACE_NODE *) CurrentObjDesc, 723 ObjDesc, ACPI_GET_OBJECT_TYPE (ObjDesc)); 724 return_ACPI_STATUS (Status); 725 } 726 727 /* 728 * Delete the existing object 729 * before storing the new one 730 */ 731 AcpiDsMethodDataDeleteValue (Opcode, Index, WalkState); 732 } 733 734 /* 735 * Install the ObjStack descriptor (*ObjDesc) into 736 * the descriptor for the Arg or Local. 737 * Install the new object in the stack entry 738 * (increments the object reference count by one) 739 */ 740 Status = AcpiDsMethodDataSetValue (Opcode, Index, ObjDesc, WalkState); 741 return_ACPI_STATUS (Status); 742} 743 744 745