dsmthdat.c revision 87031
1/******************************************************************************* 2 * 3 * Module Name: dsmthdat - control method arguments and local variables 4 * $Revision: 53 $ 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 * NOTES: WalkState fields are initialized to zero by the 145 * ACPI_MEM_CALLOCATE(). 146 * 147 * A pseudo-Namespace Node is assigned to each argument and local 148 * so that RefOf() can return a pointer to the Node. 149 * 150 ******************************************************************************/ 151 152ACPI_STATUS 153AcpiDsMethodDataInit ( 154 ACPI_WALK_STATE *WalkState) 155{ 156 UINT32 i; 157 158 159 FUNCTION_TRACE ("DsMethodDataInit"); 160 161 162 /* Init the method arguments */ 163 164 for (i = 0; i < MTH_NUM_ARGS; i++) 165 { 166 MOVE_UNALIGNED32_TO_32 (&WalkState->Arguments[i].Name, 167 NAMEOF_ARG_NTE); 168 WalkState->Arguments[i].Name |= (i << 24); 169 WalkState->Arguments[i].DataType = ACPI_DESC_TYPE_NAMED; 170 WalkState->Arguments[i].Type = ACPI_TYPE_ANY; 171 WalkState->Arguments[i].Flags = ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_ARG; 172 } 173 174 /* Init the method locals */ 175 176 for (i = 0; i < MTH_NUM_LOCALS; i++) 177 { 178 MOVE_UNALIGNED32_TO_32 (&WalkState->LocalVariables[i].Name, 179 NAMEOF_LOCAL_NTE); 180 181 WalkState->LocalVariables[i].Name |= (i << 24); 182 WalkState->LocalVariables[i].DataType = ACPI_DESC_TYPE_NAMED; 183 WalkState->LocalVariables[i].Type = ACPI_TYPE_ANY; 184 WalkState->LocalVariables[i].Flags = ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_LOCAL; 185 } 186 187 return_ACPI_STATUS (AE_OK); 188} 189 190 191/******************************************************************************* 192 * 193 * FUNCTION: AcpiDsMethodDataDeleteAll 194 * 195 * PARAMETERS: WalkState - Current walk state object 196 * 197 * RETURN: Status 198 * 199 * DESCRIPTION: Delete method locals and arguments. Arguments are only 200 * deleted if this method was called from another method. 201 * 202 ******************************************************************************/ 203 204ACPI_STATUS 205AcpiDsMethodDataDeleteAll ( 206 ACPI_WALK_STATE *WalkState) 207{ 208 UINT32 Index; 209 210 211 FUNCTION_TRACE ("DsMethodDataDeleteAll"); 212 213 214 /* Detach the locals */ 215 216 for (Index = 0; Index < MTH_NUM_LOCALS; Index++) 217 { 218 if (WalkState->LocalVariables[Index].Object) 219 { 220 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%d=%p\n", 221 Index, WalkState->LocalVariables[Index].Object)); 222 223 /* Detach object (if present) and remove a reference */ 224 225 AcpiNsDetachObject (&WalkState->LocalVariables[Index]); 226 } 227 } 228 229 /* Detach the arguments */ 230 231 for (Index = 0; Index < MTH_NUM_ARGS; Index++) 232 { 233 if (WalkState->Arguments[Index].Object) 234 { 235 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%d=%p\n", 236 Index, WalkState->Arguments[Index].Object)); 237 238 /* Detach object (if present) and remove a reference */ 239 240 AcpiNsDetachObject (&WalkState->Arguments[Index]); 241 } 242 } 243 244 return_ACPI_STATUS (AE_OK); 245} 246 247 248/******************************************************************************* 249 * 250 * FUNCTION: AcpiDsMethodDataInitArgs 251 * 252 * PARAMETERS: *Params - Pointer to a parameter list for the method 253 * MaxParamCount - The arg count for this method 254 * WalkState - Current walk state object 255 * 256 * RETURN: Status 257 * 258 * DESCRIPTION: Initialize arguments for a method. The parameter list is a list 259 * of ACPI operand objects, either null terminated or whose length 260 * is defined by MaxParamCount. 261 * 262 ******************************************************************************/ 263 264ACPI_STATUS 265AcpiDsMethodDataInitArgs ( 266 ACPI_OPERAND_OBJECT **Params, 267 UINT32 MaxParamCount, 268 ACPI_WALK_STATE *WalkState) 269{ 270 ACPI_STATUS Status; 271 UINT32 Index = 0; 272 273 274 FUNCTION_TRACE_PTR ("DsMethodDataInitArgs", Params); 275 276 277 if (!Params) 278 { 279 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "No param list passed to method\n")); 280 return_ACPI_STATUS (AE_OK); 281 } 282 283 /* Copy passed parameters into the new method stack frame */ 284 285 while ((Index < MTH_NUM_ARGS) && (Index < MaxParamCount) && Params[Index]) 286 { 287 /* 288 * A valid parameter. 289 * Store the argument in the method/walk descriptor 290 */ 291 Status = AcpiDsStoreObjectToLocal (AML_ARG_OP, Index, Params[Index], 292 WalkState); 293 if (ACPI_FAILURE (Status)) 294 { 295 return_ACPI_STATUS (Status); 296 } 297 298 Index++; 299 } 300 301 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%d args passed to method\n", Index)); 302 return_ACPI_STATUS (AE_OK); 303} 304 305 306/******************************************************************************* 307 * 308 * FUNCTION: AcpiDsMethodDataGetNode 309 * 310 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 311 * Index - Which localVar or argument whose type 312 * to get 313 * WalkState - Current walk state object 314 * 315 * RETURN: Get the Node associated with a local or arg. 316 * 317 ******************************************************************************/ 318 319ACPI_STATUS 320AcpiDsMethodDataGetNode ( 321 UINT16 Opcode, 322 UINT32 Index, 323 ACPI_WALK_STATE *WalkState, 324 ACPI_NAMESPACE_NODE **Node) 325{ 326 FUNCTION_TRACE ("DsMethodDataGetNode"); 327 328 329 /* 330 * Method Locals and Arguments are supported 331 */ 332 switch (Opcode) 333 { 334 case AML_LOCAL_OP: 335 336 if (Index > MTH_MAX_LOCAL) 337 { 338 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Local index %d is invalid (max %d)\n", 339 Index, MTH_MAX_LOCAL)); 340 return_ACPI_STATUS (AE_AML_INVALID_INDEX); 341 } 342 343 /* Return a pointer to the pseudo-node */ 344 345 *Node = &WalkState->LocalVariables[Index]; 346 break; 347 348 case AML_ARG_OP: 349 350 if (Index > MTH_MAX_ARG) 351 { 352 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Arg index %d is invalid (max %d)\n", 353 Index, MTH_MAX_ARG)); 354 return_ACPI_STATUS (AE_AML_INVALID_INDEX); 355 } 356 357 /* Return a pointer to the pseudo-node */ 358 359 *Node = &WalkState->Arguments[Index]; 360 break; 361 362 default: 363 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Opcode %d is invalid\n", Opcode)); 364 return_ACPI_STATUS (AE_AML_BAD_OPCODE); 365 break; 366 } 367 368 return_ACPI_STATUS (AE_OK); 369} 370 371 372/******************************************************************************* 373 * 374 * FUNCTION: AcpiDsMethodDataSetValue 375 * 376 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 377 * Index - Which localVar or argument to get 378 * Object - Object to be inserted into the stack entry 379 * WalkState - Current walk state object 380 * 381 * RETURN: Status 382 * 383 * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index. 384 * 385 ******************************************************************************/ 386 387ACPI_STATUS 388AcpiDsMethodDataSetValue ( 389 UINT16 Opcode, 390 UINT32 Index, 391 ACPI_OPERAND_OBJECT *Object, 392 ACPI_WALK_STATE *WalkState) 393{ 394 ACPI_STATUS Status; 395 ACPI_NAMESPACE_NODE *Node; 396 397 398 FUNCTION_TRACE ("DsMethodDataSetValue"); 399 400 401 /* Get the namespace node for the arg/local */ 402 403 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 404 if (ACPI_FAILURE (Status)) 405 { 406 return_ACPI_STATUS (Status); 407 } 408 409 /* Increment ref count so object can't be deleted while installed */ 410 411 AcpiUtAddReference (Object); 412 413 /* Install the object into the stack entry */ 414 415 Node->Object = Object; 416 return_ACPI_STATUS (AE_OK); 417} 418 419 420/******************************************************************************* 421 * 422 * FUNCTION: AcpiDsMethodDataGetType 423 * 424 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 425 * Index - Which localVar or argument whose type 426 * to get 427 * WalkState - Current walk state object 428 * 429 * RETURN: Data type of current value of the selected Arg or Local 430 * 431 ******************************************************************************/ 432 433ACPI_OBJECT_TYPE8 434AcpiDsMethodDataGetType ( 435 UINT16 Opcode, 436 UINT32 Index, 437 ACPI_WALK_STATE *WalkState) 438{ 439 ACPI_STATUS Status; 440 ACPI_NAMESPACE_NODE *Node; 441 ACPI_OPERAND_OBJECT *Object; 442 443 444 FUNCTION_TRACE ("DsMethodDataGetType"); 445 446 447 /* Get the namespace node for the arg/local */ 448 449 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 450 if (ACPI_FAILURE (Status)) 451 { 452 return_VALUE ((ACPI_TYPE_NOT_FOUND)); 453 } 454 455 /* Get the object */ 456 457 Object = AcpiNsGetAttachedObject (Node); 458 if (!Object) 459 { 460 /* Uninitialized local/arg, return TYPE_ANY */ 461 462 return_VALUE (ACPI_TYPE_ANY); 463 } 464 465 /* Get the object type */ 466 467 return_VALUE (Object->Common.Type); 468} 469 470 471/******************************************************************************* 472 * 473 * FUNCTION: AcpiDsMethodDataGetValue 474 * 475 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 476 * Index - Which localVar or argument to get 477 * WalkState - Current walk state object 478 * *DestDesc - Ptr to Descriptor into which selected Arg 479 * or Local value should be copied 480 * 481 * RETURN: Status 482 * 483 * DESCRIPTION: Retrieve value of selected Arg or Local from the method frame 484 * at the current top of the method stack. 485 * Used only in AcpiExResolveToValue(). 486 * 487 ******************************************************************************/ 488 489ACPI_STATUS 490AcpiDsMethodDataGetValue ( 491 UINT16 Opcode, 492 UINT32 Index, 493 ACPI_WALK_STATE *WalkState, 494 ACPI_OPERAND_OBJECT **DestDesc) 495{ 496 ACPI_STATUS Status; 497 ACPI_NAMESPACE_NODE *Node; 498 ACPI_OPERAND_OBJECT *Object; 499 500 501 FUNCTION_TRACE ("DsMethodDataGetValue"); 502 503 504 /* Validate the object descriptor */ 505 506 if (!DestDesc) 507 { 508 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null object descriptor pointer\n")); 509 return_ACPI_STATUS (AE_BAD_PARAMETER); 510 } 511 512 /* Get the namespace node for the arg/local */ 513 514 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 515 if (ACPI_FAILURE (Status)) 516 { 517 return_ACPI_STATUS (Status); 518 } 519 520 /* Get the object from the node */ 521 522 Object = Node->Object; 523 524 /* Examine the returned object, it must be valid. */ 525 526 if (!Object) 527 { 528 /* 529 * Index points to uninitialized object. 530 * This means that either 1) The expected argument was 531 * not passed to the method, or 2) A local variable 532 * was referenced by the method (via the ASL) 533 * before it was initialized. Either case is an error. 534 */ 535 switch (Opcode) 536 { 537 case AML_ARG_OP: 538 539 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Uninitialized Arg[%d] at node %p\n", 540 Index, Node)); 541 542 return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG); 543 break; 544 545 case AML_LOCAL_OP: 546 547 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Uninitialized Local[%d] at node %p\n", 548 Index, Node)); 549 550 return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL); 551 break; 552 } 553 } 554 555 /* 556 * The Index points to an initialized and valid object. 557 * Return an additional reference to the object 558 */ 559 *DestDesc = Object; 560 AcpiUtAddReference (Object); 561 562 return_ACPI_STATUS (AE_OK); 563} 564 565 566/******************************************************************************* 567 * 568 * FUNCTION: AcpiDsMethodDataDeleteValue 569 * 570 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 571 * Index - Which localVar or argument to delete 572 * WalkState - Current walk state object 573 * 574 * RETURN: Status 575 * 576 * DESCRIPTION: Delete the entry at Opcode:Index on the method stack. Inserts 577 * a null into the stack slot after the object is deleted. 578 * 579 ******************************************************************************/ 580 581ACPI_STATUS 582AcpiDsMethodDataDeleteValue ( 583 UINT16 Opcode, 584 UINT32 Index, 585 ACPI_WALK_STATE *WalkState) 586{ 587 ACPI_STATUS Status; 588 ACPI_NAMESPACE_NODE *Node; 589 ACPI_OPERAND_OBJECT *Object; 590 591 592 FUNCTION_TRACE ("DsMethodDataDeleteValue"); 593 594 595 /* Get the namespace node for the arg/local */ 596 597 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 598 if (ACPI_FAILURE (Status)) 599 { 600 return_ACPI_STATUS (Status); 601 } 602 603 /* Get the associated object */ 604 605 Object = AcpiNsGetAttachedObject (Node); 606 607 /* 608 * Undefine the Arg or Local by setting its descriptor 609 * pointer to NULL. Locals/Args can contain both 610 * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs 611 */ 612 Node->Object = NULL; 613 614 if ((Object) && 615 (VALID_DESCRIPTOR_TYPE (Object, ACPI_DESC_TYPE_INTERNAL))) 616 { 617 /* 618 * There is a valid object. 619 * Decrement the reference count by one to balance the 620 * increment when the object was stored. 621 */ 622 AcpiUtRemoveReference (Object); 623 } 624 625 return_ACPI_STATUS (AE_OK); 626} 627 628 629/******************************************************************************* 630 * 631 * FUNCTION: AcpiDsStoreObjectToLocal 632 * 633 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 634 * Index - Which localVar or argument to set 635 * ObjDesc - Value to be stored 636 * WalkState - Current walk state 637 * 638 * RETURN: Status 639 * 640 * DESCRIPTION: Store a value in an Arg or Local. The ObjDesc is installed 641 * as the new value for the Arg or Local and the reference count 642 * for ObjDesc is incremented. 643 * 644 ******************************************************************************/ 645 646ACPI_STATUS 647AcpiDsStoreObjectToLocal ( 648 UINT16 Opcode, 649 UINT32 Index, 650 ACPI_OPERAND_OBJECT *ObjDesc, 651 ACPI_WALK_STATE *WalkState) 652{ 653 ACPI_STATUS Status; 654 ACPI_NAMESPACE_NODE *Node; 655 ACPI_OPERAND_OBJECT *CurrentObjDesc; 656 657 658 FUNCTION_TRACE ("DsStoreObjectToLocal"); 659 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Opcode=%d Idx=%d Obj=%p\n", 660 Opcode, Index, ObjDesc)); 661 662 663 /* Parameter validation */ 664 665 if (!ObjDesc) 666 { 667 return_ACPI_STATUS (AE_BAD_PARAMETER); 668 } 669 670 /* Get the namespace node for the arg/local */ 671 672 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 673 if (ACPI_FAILURE (Status)) 674 { 675 return_ACPI_STATUS (Status); 676 } 677 678 CurrentObjDesc = AcpiNsGetAttachedObject (Node); 679 if (CurrentObjDesc == ObjDesc) 680 { 681 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p already installed!\n", ObjDesc)); 682 return_ACPI_STATUS (Status); 683 } 684 685 /* 686 * If there is an object already in this slot, we either 687 * have to delete it, or if this is an argument and there 688 * is an object reference stored there, we have to do 689 * an indirect store! 690 */ 691 if (CurrentObjDesc) 692 { 693 /* 694 * Check for an indirect store if an argument 695 * contains an object reference (stored as an Node). 696 * We don't allow this automatic dereferencing for 697 * locals, since a store to a local should overwrite 698 * anything there, including an object reference. 699 * 700 * If both Arg0 and Local0 contain RefOf (Local4): 701 * 702 * Store (1, Arg0) - Causes indirect store to local4 703 * Store (1, Local0) - Stores 1 in local0, overwriting 704 * the reference to local4 705 * Store (1, DeRefof (Local0)) - Causes indirect store to local4 706 * 707 * Weird, but true. 708 */ 709 if ((Opcode == AML_ARG_OP) && 710 (VALID_DESCRIPTOR_TYPE (CurrentObjDesc, ACPI_DESC_TYPE_NAMED))) 711 { 712 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 713 "Arg (%p) is an ObjRef(Node), storing in node %p\n", 714 ObjDesc, CurrentObjDesc)); 715 716 /* Detach an existing object from the Node */ 717 718 AcpiNsDetachObject ((ACPI_NAMESPACE_NODE *) CurrentObjDesc); 719 720 /* 721 * Store this object into the Node 722 * (perform the indirect store) 723 */ 724 Status = AcpiNsAttachObject ((ACPI_NAMESPACE_NODE *) CurrentObjDesc, 725 ObjDesc, ObjDesc->Common.Type); 726 return_ACPI_STATUS (Status); 727 } 728 729 /* 730 * Delete the existing object 731 * before storing the new one 732 */ 733 AcpiDsMethodDataDeleteValue (Opcode, Index, WalkState); 734 } 735 736 /* 737 * Install the ObjStack descriptor (*ObjDesc) into 738 * the descriptor for the Arg or Local. 739 * Install the new object in the stack entry 740 * (increments the object reference count by one) 741 */ 742 Status = AcpiDsMethodDataSetValue (Opcode, Index, ObjDesc, WalkState); 743 return_ACPI_STATUS (Status); 744} 745 746 747