dsmthdat.c revision 138287
1/******************************************************************************* 2 * 3 * Module Name: dsmthdat - control method arguments and local variables 4 * $Revision: 80 $ 5 * 6 ******************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2004, 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#include "acinterp.h" 124 125 126#define _COMPONENT ACPI_DISPATCHER 127 ACPI_MODULE_NAME ("dsmthdat") 128 129 130/******************************************************************************* 131 * 132 * FUNCTION: AcpiDsMethodDataInit 133 * 134 * PARAMETERS: WalkState - Current walk state object 135 * 136 * RETURN: Status 137 * 138 * DESCRIPTION: Initialize the data structures that hold the method's arguments 139 * and locals. The data struct is an array of NTEs for each. 140 * This allows RefOf and DeRefOf to work properly for these 141 * special data types. 142 * 143 * NOTES: WalkState fields are initialized to zero by the 144 * ACPI_MEM_CALLOCATE(). 145 * 146 * A pseudo-Namespace Node is assigned to each argument and local 147 * so that RefOf() can return a pointer to the Node. 148 * 149 ******************************************************************************/ 150 151void 152AcpiDsMethodDataInit ( 153 ACPI_WALK_STATE *WalkState) 154{ 155 UINT32 i; 156 157 158 ACPI_FUNCTION_TRACE ("DsMethodDataInit"); 159 160 161 /* Init the method arguments */ 162 163 for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) 164 { 165 ACPI_MOVE_32_TO_32 (&WalkState->Arguments[i].Name, 166 NAMEOF_ARG_NTE); 167 WalkState->Arguments[i].Name.Integer |= (i << 24); 168 WalkState->Arguments[i].Descriptor = ACPI_DESC_TYPE_NAMED; 169 WalkState->Arguments[i].Type = ACPI_TYPE_ANY; 170 WalkState->Arguments[i].Flags = ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_ARG; 171 } 172 173 /* Init the method locals */ 174 175 for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++) 176 { 177 ACPI_MOVE_32_TO_32 (&WalkState->LocalVariables[i].Name, 178 NAMEOF_LOCAL_NTE); 179 180 WalkState->LocalVariables[i].Name.Integer |= (i << 24); 181 WalkState->LocalVariables[i].Descriptor = ACPI_DESC_TYPE_NAMED; 182 WalkState->LocalVariables[i].Type = ACPI_TYPE_ANY; 183 WalkState->LocalVariables[i].Flags = ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_LOCAL; 184 } 185 186 return_VOID; 187} 188 189 190/******************************************************************************* 191 * 192 * FUNCTION: AcpiDsMethodDataDeleteAll 193 * 194 * PARAMETERS: WalkState - Current walk state object 195 * 196 * RETURN: None 197 * 198 * DESCRIPTION: Delete method locals and arguments. Arguments are only 199 * deleted if this method was called from another method. 200 * 201 ******************************************************************************/ 202 203void 204AcpiDsMethodDataDeleteAll ( 205 ACPI_WALK_STATE *WalkState) 206{ 207 UINT32 Index; 208 209 210 ACPI_FUNCTION_TRACE ("DsMethodDataDeleteAll"); 211 212 213 /* Detach the locals */ 214 215 for (Index = 0; Index < ACPI_METHOD_NUM_LOCALS; Index++) 216 { 217 if (WalkState->LocalVariables[Index].Object) 218 { 219 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%d=%p\n", 220 Index, WalkState->LocalVariables[Index].Object)); 221 222 /* Detach object (if present) and remove a reference */ 223 224 AcpiNsDetachObject (&WalkState->LocalVariables[Index]); 225 } 226 } 227 228 /* Detach the arguments */ 229 230 for (Index = 0; Index < ACPI_METHOD_NUM_ARGS; Index++) 231 { 232 if (WalkState->Arguments[Index].Object) 233 { 234 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%d=%p\n", 235 Index, WalkState->Arguments[Index].Object)); 236 237 /* Detach object (if present) and remove a reference */ 238 239 AcpiNsDetachObject (&WalkState->Arguments[Index]); 240 } 241 } 242 243 return_VOID; 244} 245 246 247/******************************************************************************* 248 * 249 * FUNCTION: AcpiDsMethodDataInitArgs 250 * 251 * PARAMETERS: *Params - Pointer to a parameter list for the method 252 * MaxParamCount - The arg count for this method 253 * WalkState - Current walk state object 254 * 255 * RETURN: Status 256 * 257 * DESCRIPTION: Initialize arguments for a method. The parameter list is a list 258 * of ACPI operand objects, either null terminated or whose length 259 * is defined by MaxParamCount. 260 * 261 ******************************************************************************/ 262 263ACPI_STATUS 264AcpiDsMethodDataInitArgs ( 265 ACPI_OPERAND_OBJECT **Params, 266 UINT32 MaxParamCount, 267 ACPI_WALK_STATE *WalkState) 268{ 269 ACPI_STATUS Status; 270 UINT32 Index = 0; 271 272 273 ACPI_FUNCTION_TRACE_PTR ("DsMethodDataInitArgs", Params); 274 275 276 if (!Params) 277 { 278 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "No param list passed to method\n")); 279 return_ACPI_STATUS (AE_OK); 280 } 281 282 /* Copy passed parameters into the new method stack frame */ 283 284 while ((Index < ACPI_METHOD_NUM_ARGS) && (Index < MaxParamCount) && Params[Index]) 285 { 286 /* 287 * A valid parameter. 288 * Store the argument in the method/walk descriptor. 289 * Do not copy the arg in order to implement call by reference 290 */ 291 Status = AcpiDsMethodDataSetValue (AML_ARG_OP, Index, Params[Index], WalkState); 292 if (ACPI_FAILURE (Status)) 293 { 294 return_ACPI_STATUS (Status); 295 } 296 297 Index++; 298 } 299 300 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%d args passed to method\n", Index)); 301 return_ACPI_STATUS (AE_OK); 302} 303 304 305/******************************************************************************* 306 * 307 * FUNCTION: AcpiDsMethodDataGetNode 308 * 309 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 310 * Index - Which localVar or argument whose type 311 * to get 312 * WalkState - Current walk state object 313 * 314 * RETURN: Get the Node associated with a local or arg. 315 * 316 ******************************************************************************/ 317 318ACPI_STATUS 319AcpiDsMethodDataGetNode ( 320 UINT16 Opcode, 321 UINT32 Index, 322 ACPI_WALK_STATE *WalkState, 323 ACPI_NAMESPACE_NODE **Node) 324{ 325 ACPI_FUNCTION_TRACE ("DsMethodDataGetNode"); 326 327 328 /* 329 * Method Locals and Arguments are supported 330 */ 331 switch (Opcode) 332 { 333 case AML_LOCAL_OP: 334 335 if (Index > ACPI_METHOD_MAX_LOCAL) 336 { 337 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Local index %d is invalid (max %d)\n", 338 Index, ACPI_METHOD_MAX_LOCAL)); 339 return_ACPI_STATUS (AE_AML_INVALID_INDEX); 340 } 341 342 /* Return a pointer to the pseudo-node */ 343 344 *Node = &WalkState->LocalVariables[Index]; 345 break; 346 347 case AML_ARG_OP: 348 349 if (Index > ACPI_METHOD_MAX_ARG) 350 { 351 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Arg index %d is invalid (max %d)\n", 352 Index, ACPI_METHOD_MAX_ARG)); 353 return_ACPI_STATUS (AE_AML_INVALID_INDEX); 354 } 355 356 /* Return a pointer to the pseudo-node */ 357 358 *Node = &WalkState->Arguments[Index]; 359 break; 360 361 default: 362 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Opcode %d is invalid\n", Opcode)); 363 return_ACPI_STATUS (AE_AML_BAD_OPCODE); 364 } 365 366 return_ACPI_STATUS (AE_OK); 367} 368 369 370/******************************************************************************* 371 * 372 * FUNCTION: AcpiDsMethodDataSetValue 373 * 374 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 375 * Index - Which localVar or argument to get 376 * Object - Object to be inserted into the stack entry 377 * WalkState - Current walk state object 378 * 379 * RETURN: Status 380 * 381 * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index. 382 * Note: There is no "implicit conversion" for locals. 383 * 384 ******************************************************************************/ 385 386ACPI_STATUS 387AcpiDsMethodDataSetValue ( 388 UINT16 Opcode, 389 UINT32 Index, 390 ACPI_OPERAND_OBJECT *Object, 391 ACPI_WALK_STATE *WalkState) 392{ 393 ACPI_STATUS Status; 394 ACPI_NAMESPACE_NODE *Node; 395 396 397 ACPI_FUNCTION_TRACE ("DsMethodDataSetValue"); 398 399 400 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 401 "NewObj %p Opcode %X, Refs=%d [%s]\n", Object, 402 Opcode, Object->Common.ReferenceCount, 403 AcpiUtGetTypeName (Object->Common.Type))); 404 405 /* Get the namespace node for the arg/local */ 406 407 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 408 if (ACPI_FAILURE (Status)) 409 { 410 return_ACPI_STATUS (Status); 411 } 412 413 /* 414 * Increment ref count so object can't be deleted while installed. 415 * NOTE: We do not copy the object in order to preserve the call by 416 * reference semantics of ACPI Control Method invocation. 417 * (See ACPI Specification 2.0C) 418 */ 419 AcpiUtAddReference (Object); 420 421 /* Install the object */ 422 423 Node->Object = Object; 424 return_ACPI_STATUS (Status); 425} 426 427 428/******************************************************************************* 429 * 430 * FUNCTION: AcpiDsMethodDataGetType 431 * 432 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 433 * Index - Which localVar or argument whose type 434 * to get 435 * WalkState - Current walk state object 436 * 437 * RETURN: Data type of current value of the selected Arg or Local 438 * 439 ******************************************************************************/ 440 441ACPI_OBJECT_TYPE 442AcpiDsMethodDataGetType ( 443 UINT16 Opcode, 444 UINT32 Index, 445 ACPI_WALK_STATE *WalkState) 446{ 447 ACPI_STATUS Status; 448 ACPI_NAMESPACE_NODE *Node; 449 ACPI_OPERAND_OBJECT *Object; 450 451 452 ACPI_FUNCTION_TRACE ("DsMethodDataGetType"); 453 454 455 /* Get the namespace node for the arg/local */ 456 457 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 458 if (ACPI_FAILURE (Status)) 459 { 460 return_VALUE ((ACPI_TYPE_NOT_FOUND)); 461 } 462 463 /* Get the object */ 464 465 Object = AcpiNsGetAttachedObject (Node); 466 if (!Object) 467 { 468 /* Uninitialized local/arg, return TYPE_ANY */ 469 470 return_VALUE (ACPI_TYPE_ANY); 471 } 472 473 /* Get the object type */ 474 475 return_VALUE (ACPI_GET_OBJECT_TYPE (Object)); 476} 477 478 479/******************************************************************************* 480 * 481 * FUNCTION: AcpiDsMethodDataGetValue 482 * 483 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 484 * Index - Which localVar or argument to get 485 * WalkState - Current walk state object 486 * *DestDesc - Ptr to Descriptor into which selected Arg 487 * or Local value should be copied 488 * 489 * RETURN: Status 490 * 491 * DESCRIPTION: Retrieve value of selected Arg or Local from the method frame 492 * at the current top of the method stack. 493 * Used only in AcpiExResolveToValue(). 494 * 495 ******************************************************************************/ 496 497ACPI_STATUS 498AcpiDsMethodDataGetValue ( 499 UINT16 Opcode, 500 UINT32 Index, 501 ACPI_WALK_STATE *WalkState, 502 ACPI_OPERAND_OBJECT **DestDesc) 503{ 504 ACPI_STATUS Status; 505 ACPI_NAMESPACE_NODE *Node; 506 ACPI_OPERAND_OBJECT *Object; 507 508 509 ACPI_FUNCTION_TRACE ("DsMethodDataGetValue"); 510 511 512 /* Validate the object descriptor */ 513 514 if (!DestDesc) 515 { 516 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null object descriptor pointer\n")); 517 return_ACPI_STATUS (AE_BAD_PARAMETER); 518 } 519 520 /* Get the namespace node for the arg/local */ 521 522 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 523 if (ACPI_FAILURE (Status)) 524 { 525 return_ACPI_STATUS (Status); 526 } 527 528 /* Get the object from the node */ 529 530 Object = Node->Object; 531 532 /* Examine the returned object, it must be valid. */ 533 534 if (!Object) 535 { 536 /* 537 * Index points to uninitialized object. 538 * This means that either 1) The expected argument was 539 * not passed to the method, or 2) A local variable 540 * was referenced by the method (via the ASL) 541 * before it was initialized. Either case is an error. 542 */ 543 544 /* If slack enabled, init the LocalX/ArgX to an Integer of value zero */ 545 546 if (AcpiGbl_EnableInterpreterSlack) 547 { 548 Object = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); 549 if (!Object) 550 { 551 return_ACPI_STATUS (AE_NO_MEMORY); 552 } 553 554 Object->Integer.Value = 0; 555 Node->Object = Object; 556 } 557 558 /* Otherwise, return the error */ 559 560 else switch (Opcode) 561 { 562 case AML_ARG_OP: 563 564 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Uninitialized Arg[%d] at node %p\n", 565 Index, Node)); 566 567 return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG); 568 569 case AML_LOCAL_OP: 570 571 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Uninitialized Local[%d] at node %p\n", 572 Index, Node)); 573 574 return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL); 575 576 default: 577 ACPI_REPORT_ERROR (("Not Arg/Local opcode: %X\n", Opcode)); 578 return_ACPI_STATUS (AE_AML_INTERNAL); 579 } 580 } 581 582 /* 583 * The Index points to an initialized and valid object. 584 * Return an additional reference to the object 585 */ 586 *DestDesc = Object; 587 AcpiUtAddReference (Object); 588 589 return_ACPI_STATUS (AE_OK); 590} 591 592 593/******************************************************************************* 594 * 595 * FUNCTION: AcpiDsMethodDataDeleteValue 596 * 597 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 598 * Index - Which localVar or argument to delete 599 * WalkState - Current walk state object 600 * 601 * RETURN: None 602 * 603 * DESCRIPTION: Delete the entry at Opcode:Index on the method stack. Inserts 604 * a null into the stack slot after the object is deleted. 605 * 606 ******************************************************************************/ 607 608void 609AcpiDsMethodDataDeleteValue ( 610 UINT16 Opcode, 611 UINT32 Index, 612 ACPI_WALK_STATE *WalkState) 613{ 614 ACPI_STATUS Status; 615 ACPI_NAMESPACE_NODE *Node; 616 ACPI_OPERAND_OBJECT *Object; 617 618 619 ACPI_FUNCTION_TRACE ("DsMethodDataDeleteValue"); 620 621 622 /* Get the namespace node for the arg/local */ 623 624 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 625 if (ACPI_FAILURE (Status)) 626 { 627 return_VOID; 628 } 629 630 /* Get the associated object */ 631 632 Object = AcpiNsGetAttachedObject (Node); 633 634 /* 635 * Undefine the Arg or Local by setting its descriptor 636 * pointer to NULL. Locals/Args can contain both 637 * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs 638 */ 639 Node->Object = NULL; 640 641 if ((Object) && 642 (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_OPERAND)) 643 { 644 /* 645 * There is a valid object. 646 * Decrement the reference count by one to balance the 647 * increment when the object was stored. 648 */ 649 AcpiUtRemoveReference (Object); 650 } 651 652 return_VOID; 653} 654 655 656/******************************************************************************* 657 * 658 * FUNCTION: AcpiDsStoreObjectToLocal 659 * 660 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 661 * Index - Which localVar or argument to set 662 * ObjDesc - Value to be stored 663 * WalkState - Current walk state 664 * 665 * RETURN: Status 666 * 667 * DESCRIPTION: Store a value in an Arg or Local. The ObjDesc is installed 668 * as the new value for the Arg or Local and the reference count 669 * for ObjDesc is incremented. 670 * 671 ******************************************************************************/ 672 673ACPI_STATUS 674AcpiDsStoreObjectToLocal ( 675 UINT16 Opcode, 676 UINT32 Index, 677 ACPI_OPERAND_OBJECT *ObjDesc, 678 ACPI_WALK_STATE *WalkState) 679{ 680 ACPI_STATUS Status; 681 ACPI_NAMESPACE_NODE *Node; 682 ACPI_OPERAND_OBJECT *CurrentObjDesc; 683 ACPI_OPERAND_OBJECT *NewObjDesc; 684 685 686 ACPI_FUNCTION_TRACE ("DsStoreObjectToLocal"); 687 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Opcode=%X Index=%d Obj=%p\n", 688 Opcode, Index, ObjDesc)); 689 690 /* Parameter validation */ 691 692 if (!ObjDesc) 693 { 694 return_ACPI_STATUS (AE_BAD_PARAMETER); 695 } 696 697 /* Get the namespace node for the arg/local */ 698 699 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 700 if (ACPI_FAILURE (Status)) 701 { 702 return_ACPI_STATUS (Status); 703 } 704 705 CurrentObjDesc = AcpiNsGetAttachedObject (Node); 706 if (CurrentObjDesc == ObjDesc) 707 { 708 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p already installed!\n", 709 ObjDesc)); 710 return_ACPI_STATUS (Status); 711 } 712 713 /* 714 * If the reference count on the object is more than one, we must 715 * take a copy of the object before we store. A reference count 716 * of exactly 1 means that the object was just created during the 717 * evaluation of an expression, and we can safely use it since it 718 * is not used anywhere else. 719 */ 720 NewObjDesc = ObjDesc; 721 if (ObjDesc->Common.ReferenceCount > 1) 722 { 723 Status = AcpiUtCopyIobjectToIobject (ObjDesc, &NewObjDesc, WalkState); 724 if (ACPI_FAILURE (Status)) 725 { 726 return_ACPI_STATUS (Status); 727 } 728 } 729 730 /* 731 * If there is an object already in this slot, we either 732 * have to delete it, or if this is an argument and there 733 * is an object reference stored there, we have to do 734 * an indirect store! 735 */ 736 if (CurrentObjDesc) 737 { 738 /* 739 * Check for an indirect store if an argument 740 * contains an object reference (stored as an Node). 741 * We don't allow this automatic dereferencing for 742 * locals, since a store to a local should overwrite 743 * anything there, including an object reference. 744 * 745 * If both Arg0 and Local0 contain RefOf (Local4): 746 * 747 * Store (1, Arg0) - Causes indirect store to local4 748 * Store (1, Local0) - Stores 1 in local0, overwriting 749 * the reference to local4 750 * Store (1, DeRefof (Local0)) - Causes indirect store to local4 751 * 752 * Weird, but true. 753 */ 754 if (Opcode == AML_ARG_OP) 755 { 756 /* 757 * Make sure that the object is the correct type. This may be overkill, but 758 * it is here because references were NS nodes in the past. Now they are 759 * operand objects of type Reference. 760 */ 761 if (ACPI_GET_DESCRIPTOR_TYPE (CurrentObjDesc) != ACPI_DESC_TYPE_OPERAND) 762 { 763 ACPI_REPORT_ERROR (("Invalid descriptor type while storing to method arg: [%s]\n", 764 AcpiUtGetDescriptorName (CurrentObjDesc))); 765 return_ACPI_STATUS (AE_AML_INTERNAL); 766 } 767 768 /* 769 * If we have a valid reference object that came from RefOf(), do the 770 * indirect store 771 */ 772 if ((CurrentObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) && 773 (CurrentObjDesc->Reference.Opcode == AML_REF_OF_OP)) 774 { 775 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 776 "Arg (%p) is an ObjRef(Node), storing in node %p\n", 777 NewObjDesc, CurrentObjDesc)); 778 779 /* 780 * Store this object to the Node (perform the indirect store) 781 * NOTE: No implicit conversion is performed, as per the ACPI 782 * specification rules on storing to Locals/Args. 783 */ 784 Status = AcpiExStoreObjectToNode (NewObjDesc, 785 CurrentObjDesc->Reference.Object, WalkState, 786 ACPI_NO_IMPLICIT_CONVERSION); 787 788 /* Remove local reference if we copied the object above */ 789 790 if (NewObjDesc != ObjDesc) 791 { 792 AcpiUtRemoveReference (NewObjDesc); 793 } 794 return_ACPI_STATUS (Status); 795 } 796 } 797 798 /* 799 * Delete the existing object 800 * before storing the new one 801 */ 802 AcpiDsMethodDataDeleteValue (Opcode, Index, WalkState); 803 } 804 805 /* 806 * Install the Obj descriptor (*NewObjDesc) into 807 * the descriptor for the Arg or Local. 808 * (increments the object reference count by one) 809 */ 810 Status = AcpiDsMethodDataSetValue (Opcode, Index, NewObjDesc, WalkState); 811 812 /* Remove local reference if we copied the object above */ 813 814 if (NewObjDesc != ObjDesc) 815 { 816 AcpiUtRemoveReference (NewObjDesc); 817 } 818 819 return_ACPI_STATUS (Status); 820} 821 822 823