dsmthdat.c revision 151937
1/******************************************************************************* 2 * 3 * Module Name: dsmthdat - control method arguments and local variables 4 * $Revision: 1.85 $ 5 * 6 ******************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2005, 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 <contrib/dev/acpica/acpi.h> 120#include <contrib/dev/acpica/acdispat.h> 121#include <contrib/dev/acpica/amlcode.h> 122#include <contrib/dev/acpica/acnamesp.h> 123#include <contrib/dev/acpica/acinterp.h> 124 125 126#define _COMPONENT ACPI_DISPATCHER 127 ACPI_MODULE_NAME ("dsmthdat") 128 129/* Local prototypes */ 130 131static void 132AcpiDsMethodDataDeleteValue ( 133 UINT16 Opcode, 134 UINT32 Index, 135 ACPI_WALK_STATE *WalkState); 136 137static ACPI_STATUS 138AcpiDsMethodDataSetValue ( 139 UINT16 Opcode, 140 UINT32 Index, 141 ACPI_OPERAND_OBJECT *Object, 142 ACPI_WALK_STATE *WalkState); 143 144#ifdef ACPI_OBSOLETE_FUNCTIONS 145ACPI_OBJECT_TYPE 146AcpiDsMethodDataGetType ( 147 UINT16 Opcode, 148 UINT32 Index, 149 ACPI_WALK_STATE *WalkState); 150#endif 151 152 153/******************************************************************************* 154 * 155 * FUNCTION: AcpiDsMethodDataInit 156 * 157 * PARAMETERS: WalkState - Current walk state object 158 * 159 * RETURN: Status 160 * 161 * DESCRIPTION: Initialize the data structures that hold the method's arguments 162 * and locals. The data struct is an array of namespace nodes for 163 * each - this allows RefOf and DeRefOf to work properly for these 164 * special data types. 165 * 166 * NOTES: WalkState fields are initialized to zero by the 167 * ACPI_MEM_CALLOCATE(). 168 * 169 * A pseudo-Namespace Node is assigned to each argument and local 170 * so that RefOf() can return a pointer to the Node. 171 * 172 ******************************************************************************/ 173 174void 175AcpiDsMethodDataInit ( 176 ACPI_WALK_STATE *WalkState) 177{ 178 UINT32 i; 179 180 181 ACPI_FUNCTION_TRACE ("DsMethodDataInit"); 182 183 184 /* Init the method arguments */ 185 186 for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) 187 { 188 ACPI_MOVE_32_TO_32 (&WalkState->Arguments[i].Name, 189 NAMEOF_ARG_NTE); 190 WalkState->Arguments[i].Name.Integer |= (i << 24); 191 WalkState->Arguments[i].Descriptor = ACPI_DESC_TYPE_NAMED; 192 WalkState->Arguments[i].Type = ACPI_TYPE_ANY; 193 WalkState->Arguments[i].Flags = ANOBJ_END_OF_PEER_LIST | 194 ANOBJ_METHOD_ARG; 195 } 196 197 /* Init the method locals */ 198 199 for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++) 200 { 201 ACPI_MOVE_32_TO_32 (&WalkState->LocalVariables[i].Name, 202 NAMEOF_LOCAL_NTE); 203 204 WalkState->LocalVariables[i].Name.Integer |= (i << 24); 205 WalkState->LocalVariables[i].Descriptor = ACPI_DESC_TYPE_NAMED; 206 WalkState->LocalVariables[i].Type = ACPI_TYPE_ANY; 207 WalkState->LocalVariables[i].Flags = ANOBJ_END_OF_PEER_LIST | 208 ANOBJ_METHOD_LOCAL; 209 } 210 211 return_VOID; 212} 213 214 215/******************************************************************************* 216 * 217 * FUNCTION: AcpiDsMethodDataDeleteAll 218 * 219 * PARAMETERS: WalkState - Current walk state object 220 * 221 * RETURN: None 222 * 223 * DESCRIPTION: Delete method locals and arguments. Arguments are only 224 * deleted if this method was called from another method. 225 * 226 ******************************************************************************/ 227 228void 229AcpiDsMethodDataDeleteAll ( 230 ACPI_WALK_STATE *WalkState) 231{ 232 UINT32 Index; 233 234 235 ACPI_FUNCTION_TRACE ("DsMethodDataDeleteAll"); 236 237 238 /* Detach the locals */ 239 240 for (Index = 0; Index < ACPI_METHOD_NUM_LOCALS; Index++) 241 { 242 if (WalkState->LocalVariables[Index].Object) 243 { 244 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%d=%p\n", 245 Index, WalkState->LocalVariables[Index].Object)); 246 247 /* Detach object (if present) and remove a reference */ 248 249 AcpiNsDetachObject (&WalkState->LocalVariables[Index]); 250 } 251 } 252 253 /* Detach the arguments */ 254 255 for (Index = 0; Index < ACPI_METHOD_NUM_ARGS; Index++) 256 { 257 if (WalkState->Arguments[Index].Object) 258 { 259 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%d=%p\n", 260 Index, WalkState->Arguments[Index].Object)); 261 262 /* Detach object (if present) and remove a reference */ 263 264 AcpiNsDetachObject (&WalkState->Arguments[Index]); 265 } 266 } 267 268 return_VOID; 269} 270 271 272/******************************************************************************* 273 * 274 * FUNCTION: AcpiDsMethodDataInitArgs 275 * 276 * PARAMETERS: *Params - Pointer to a parameter list for the method 277 * MaxParamCount - The arg count for this method 278 * WalkState - Current walk state object 279 * 280 * RETURN: Status 281 * 282 * DESCRIPTION: Initialize arguments for a method. The parameter list is a list 283 * of ACPI operand objects, either null terminated or whose length 284 * is defined by MaxParamCount. 285 * 286 ******************************************************************************/ 287 288ACPI_STATUS 289AcpiDsMethodDataInitArgs ( 290 ACPI_OPERAND_OBJECT **Params, 291 UINT32 MaxParamCount, 292 ACPI_WALK_STATE *WalkState) 293{ 294 ACPI_STATUS Status; 295 UINT32 Index = 0; 296 297 298 ACPI_FUNCTION_TRACE_PTR ("DsMethodDataInitArgs", Params); 299 300 301 if (!Params) 302 { 303 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "No param list passed to method\n")); 304 return_ACPI_STATUS (AE_OK); 305 } 306 307 /* Copy passed parameters into the new method stack frame */ 308 309 while ((Index < ACPI_METHOD_NUM_ARGS) && 310 (Index < MaxParamCount) && 311 Params[Index]) 312 { 313 /* 314 * A valid parameter. 315 * Store the argument in the method/walk descriptor. 316 * Do not copy the arg in order to implement call by reference 317 */ 318 Status = AcpiDsMethodDataSetValue (AML_ARG_OP, Index, 319 Params[Index], WalkState); 320 if (ACPI_FAILURE (Status)) 321 { 322 return_ACPI_STATUS (Status); 323 } 324 325 Index++; 326 } 327 328 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%d args passed to method\n", Index)); 329 return_ACPI_STATUS (AE_OK); 330} 331 332 333/******************************************************************************* 334 * 335 * FUNCTION: AcpiDsMethodDataGetNode 336 * 337 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 338 * Index - Which Local or Arg whose type to get 339 * WalkState - Current walk state object 340 * Node - Where the node is returned. 341 * 342 * RETURN: Status and node 343 * 344 * DESCRIPTION: Get the Node associated with a local or arg. 345 * 346 ******************************************************************************/ 347 348ACPI_STATUS 349AcpiDsMethodDataGetNode ( 350 UINT16 Opcode, 351 UINT32 Index, 352 ACPI_WALK_STATE *WalkState, 353 ACPI_NAMESPACE_NODE **Node) 354{ 355 ACPI_FUNCTION_TRACE ("DsMethodDataGetNode"); 356 357 358 /* 359 * Method Locals and Arguments are supported 360 */ 361 switch (Opcode) 362 { 363 case AML_LOCAL_OP: 364 365 if (Index > ACPI_METHOD_MAX_LOCAL) 366 { 367 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 368 "Local index %d is invalid (max %d)\n", 369 Index, ACPI_METHOD_MAX_LOCAL)); 370 return_ACPI_STATUS (AE_AML_INVALID_INDEX); 371 } 372 373 /* Return a pointer to the pseudo-node */ 374 375 *Node = &WalkState->LocalVariables[Index]; 376 break; 377 378 case AML_ARG_OP: 379 380 if (Index > ACPI_METHOD_MAX_ARG) 381 { 382 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 383 "Arg index %d is invalid (max %d)\n", 384 Index, ACPI_METHOD_MAX_ARG)); 385 return_ACPI_STATUS (AE_AML_INVALID_INDEX); 386 } 387 388 /* Return a pointer to the pseudo-node */ 389 390 *Node = &WalkState->Arguments[Index]; 391 break; 392 393 default: 394 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Opcode %d is invalid\n", Opcode)); 395 return_ACPI_STATUS (AE_AML_BAD_OPCODE); 396 } 397 398 return_ACPI_STATUS (AE_OK); 399} 400 401 402/******************************************************************************* 403 * 404 * FUNCTION: AcpiDsMethodDataSetValue 405 * 406 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 407 * Index - Which Local or Arg to get 408 * Object - Object to be inserted into the stack entry 409 * WalkState - Current walk state object 410 * 411 * RETURN: Status 412 * 413 * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index. 414 * Note: There is no "implicit conversion" for locals. 415 * 416 ******************************************************************************/ 417 418static ACPI_STATUS 419AcpiDsMethodDataSetValue ( 420 UINT16 Opcode, 421 UINT32 Index, 422 ACPI_OPERAND_OBJECT *Object, 423 ACPI_WALK_STATE *WalkState) 424{ 425 ACPI_STATUS Status; 426 ACPI_NAMESPACE_NODE *Node; 427 428 429 ACPI_FUNCTION_TRACE ("DsMethodDataSetValue"); 430 431 432 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 433 "NewObj %p Opcode %X, Refs=%d [%s]\n", Object, 434 Opcode, Object->Common.ReferenceCount, 435 AcpiUtGetTypeName (Object->Common.Type))); 436 437 /* Get the namespace node for the arg/local */ 438 439 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 440 if (ACPI_FAILURE (Status)) 441 { 442 return_ACPI_STATUS (Status); 443 } 444 445 /* 446 * Increment ref count so object can't be deleted while installed. 447 * NOTE: We do not copy the object in order to preserve the call by 448 * reference semantics of ACPI Control Method invocation. 449 * (See ACPI Specification 2.0C) 450 */ 451 AcpiUtAddReference (Object); 452 453 /* Install the object */ 454 455 Node->Object = Object; 456 return_ACPI_STATUS (Status); 457} 458 459 460/******************************************************************************* 461 * 462 * FUNCTION: AcpiDsMethodDataGetValue 463 * 464 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 465 * Index - Which localVar or argument to get 466 * WalkState - Current walk state object 467 * DestDesc - Where Arg or Local value is returned 468 * 469 * RETURN: Status 470 * 471 * DESCRIPTION: Retrieve value of selected Arg or Local for this method 472 * Used only in AcpiExResolveToValue(). 473 * 474 ******************************************************************************/ 475 476ACPI_STATUS 477AcpiDsMethodDataGetValue ( 478 UINT16 Opcode, 479 UINT32 Index, 480 ACPI_WALK_STATE *WalkState, 481 ACPI_OPERAND_OBJECT **DestDesc) 482{ 483 ACPI_STATUS Status; 484 ACPI_NAMESPACE_NODE *Node; 485 ACPI_OPERAND_OBJECT *Object; 486 487 488 ACPI_FUNCTION_TRACE ("DsMethodDataGetValue"); 489 490 491 /* Validate the object descriptor */ 492 493 if (!DestDesc) 494 { 495 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null object descriptor pointer\n")); 496 return_ACPI_STATUS (AE_BAD_PARAMETER); 497 } 498 499 /* Get the namespace node for the arg/local */ 500 501 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 502 if (ACPI_FAILURE (Status)) 503 { 504 return_ACPI_STATUS (Status); 505 } 506 507 /* Get the object from the node */ 508 509 Object = Node->Object; 510 511 /* Examine the returned object, it must be valid. */ 512 513 if (!Object) 514 { 515 /* 516 * Index points to uninitialized object. 517 * This means that either 1) The expected argument was 518 * not passed to the method, or 2) A local variable 519 * was referenced by the method (via the ASL) 520 * before it was initialized. Either case is an error. 521 */ 522 523 /* If slack enabled, init the LocalX/ArgX to an Integer of value zero */ 524 525 if (AcpiGbl_EnableInterpreterSlack) 526 { 527 Object = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); 528 if (!Object) 529 { 530 return_ACPI_STATUS (AE_NO_MEMORY); 531 } 532 533 Object->Integer.Value = 0; 534 Node->Object = Object; 535 } 536 537 /* Otherwise, return the error */ 538 539 else switch (Opcode) 540 { 541 case AML_ARG_OP: 542 543 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 544 "Uninitialized Arg[%d] at node %p\n", 545 Index, Node)); 546 547 return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG); 548 549 case AML_LOCAL_OP: 550 551 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 552 "Uninitialized Local[%d] at node %p\n", 553 Index, Node)); 554 555 return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL); 556 557 default: 558 ACPI_REPORT_ERROR (("Not Arg/Local opcode: %X\n", Opcode)); 559 return_ACPI_STATUS (AE_AML_INTERNAL); 560 } 561 } 562 563 /* 564 * The Index points to an initialized and valid object. 565 * Return an additional reference to the object 566 */ 567 *DestDesc = Object; 568 AcpiUtAddReference (Object); 569 570 return_ACPI_STATUS (AE_OK); 571} 572 573 574/******************************************************************************* 575 * 576 * FUNCTION: AcpiDsMethodDataDeleteValue 577 * 578 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 579 * Index - Which localVar or argument to delete 580 * WalkState - Current walk state object 581 * 582 * RETURN: None 583 * 584 * DESCRIPTION: Delete the entry at Opcode:Index. Inserts 585 * a null into the stack slot after the object is deleted. 586 * 587 ******************************************************************************/ 588 589static void 590AcpiDsMethodDataDeleteValue ( 591 UINT16 Opcode, 592 UINT32 Index, 593 ACPI_WALK_STATE *WalkState) 594{ 595 ACPI_STATUS Status; 596 ACPI_NAMESPACE_NODE *Node; 597 ACPI_OPERAND_OBJECT *Object; 598 599 600 ACPI_FUNCTION_TRACE ("DsMethodDataDeleteValue"); 601 602 603 /* Get the namespace node for the arg/local */ 604 605 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 606 if (ACPI_FAILURE (Status)) 607 { 608 return_VOID; 609 } 610 611 /* Get the associated object */ 612 613 Object = AcpiNsGetAttachedObject (Node); 614 615 /* 616 * Undefine the Arg or Local by setting its descriptor 617 * pointer to NULL. Locals/Args can contain both 618 * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs 619 */ 620 Node->Object = NULL; 621 622 if ((Object) && 623 (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_OPERAND)) 624 { 625 /* 626 * There is a valid object. 627 * Decrement the reference count by one to balance the 628 * increment when the object was stored. 629 */ 630 AcpiUtRemoveReference (Object); 631 } 632 633 return_VOID; 634} 635 636 637/******************************************************************************* 638 * 639 * FUNCTION: AcpiDsStoreObjectToLocal 640 * 641 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 642 * Index - Which Local or Arg to set 643 * ObjDesc - Value to be stored 644 * WalkState - Current walk state 645 * 646 * RETURN: Status 647 * 648 * DESCRIPTION: Store a value in an Arg or Local. The ObjDesc is installed 649 * as the new value for the Arg or Local and the reference count 650 * for ObjDesc is incremented. 651 * 652 ******************************************************************************/ 653 654ACPI_STATUS 655AcpiDsStoreObjectToLocal ( 656 UINT16 Opcode, 657 UINT32 Index, 658 ACPI_OPERAND_OBJECT *ObjDesc, 659 ACPI_WALK_STATE *WalkState) 660{ 661 ACPI_STATUS Status; 662 ACPI_NAMESPACE_NODE *Node; 663 ACPI_OPERAND_OBJECT *CurrentObjDesc; 664 ACPI_OPERAND_OBJECT *NewObjDesc; 665 666 667 ACPI_FUNCTION_TRACE ("DsStoreObjectToLocal"); 668 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Opcode=%X Index=%d Obj=%p\n", 669 Opcode, Index, ObjDesc)); 670 671 /* Parameter validation */ 672 673 if (!ObjDesc) 674 { 675 return_ACPI_STATUS (AE_BAD_PARAMETER); 676 } 677 678 /* Get the namespace node for the arg/local */ 679 680 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 681 if (ACPI_FAILURE (Status)) 682 { 683 return_ACPI_STATUS (Status); 684 } 685 686 CurrentObjDesc = AcpiNsGetAttachedObject (Node); 687 if (CurrentObjDesc == ObjDesc) 688 { 689 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p already installed!\n", 690 ObjDesc)); 691 return_ACPI_STATUS (Status); 692 } 693 694 /* 695 * If the reference count on the object is more than one, we must 696 * take a copy of the object before we store. A reference count 697 * of exactly 1 means that the object was just created during the 698 * evaluation of an expression, and we can safely use it since it 699 * is not used anywhere else. 700 */ 701 NewObjDesc = ObjDesc; 702 if (ObjDesc->Common.ReferenceCount > 1) 703 { 704 Status = AcpiUtCopyIobjectToIobject (ObjDesc, &NewObjDesc, WalkState); 705 if (ACPI_FAILURE (Status)) 706 { 707 return_ACPI_STATUS (Status); 708 } 709 } 710 711 /* 712 * If there is an object already in this slot, we either 713 * have to delete it, or if this is an argument and there 714 * is an object reference stored there, we have to do 715 * an indirect store! 716 */ 717 if (CurrentObjDesc) 718 { 719 /* 720 * Check for an indirect store if an argument 721 * contains an object reference (stored as an Node). 722 * We don't allow this automatic dereferencing for 723 * locals, since a store to a local should overwrite 724 * anything there, including an object reference. 725 * 726 * If both Arg0 and Local0 contain RefOf (Local4): 727 * 728 * Store (1, Arg0) - Causes indirect store to local4 729 * Store (1, Local0) - Stores 1 in local0, overwriting 730 * the reference to local4 731 * Store (1, DeRefof (Local0)) - Causes indirect store to local4 732 * 733 * Weird, but true. 734 */ 735 if (Opcode == AML_ARG_OP) 736 { 737 /* 738 * If we have a valid reference object that came from RefOf(), 739 * do the indirect store 740 */ 741 if ((ACPI_GET_DESCRIPTOR_TYPE (CurrentObjDesc) == ACPI_DESC_TYPE_OPERAND) && 742 (CurrentObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) && 743 (CurrentObjDesc->Reference.Opcode == AML_REF_OF_OP)) 744 { 745 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 746 "Arg (%p) is an ObjRef(Node), storing in node %p\n", 747 NewObjDesc, CurrentObjDesc)); 748 749 /* 750 * Store this object to the Node (perform the indirect store) 751 * NOTE: No implicit conversion is performed, as per the ACPI 752 * specification rules on storing to Locals/Args. 753 */ 754 Status = AcpiExStoreObjectToNode (NewObjDesc, 755 CurrentObjDesc->Reference.Object, WalkState, 756 ACPI_NO_IMPLICIT_CONVERSION); 757 758 /* Remove local reference if we copied the object above */ 759 760 if (NewObjDesc != ObjDesc) 761 { 762 AcpiUtRemoveReference (NewObjDesc); 763 } 764 return_ACPI_STATUS (Status); 765 } 766 } 767 768 /* 769 * Delete the existing object 770 * before storing the new one 771 */ 772 AcpiDsMethodDataDeleteValue (Opcode, Index, WalkState); 773 } 774 775 /* 776 * Install the Obj descriptor (*NewObjDesc) into 777 * the descriptor for the Arg or Local. 778 * (increments the object reference count by one) 779 */ 780 Status = AcpiDsMethodDataSetValue (Opcode, Index, NewObjDesc, WalkState); 781 782 /* Remove local reference if we copied the object above */ 783 784 if (NewObjDesc != ObjDesc) 785 { 786 AcpiUtRemoveReference (NewObjDesc); 787 } 788 789 return_ACPI_STATUS (Status); 790} 791 792 793#ifdef ACPI_OBSOLETE_FUNCTIONS 794/******************************************************************************* 795 * 796 * FUNCTION: AcpiDsMethodDataGetType 797 * 798 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 799 * Index - Which Local or Arg whose type to get 800 * WalkState - Current walk state object 801 * 802 * RETURN: Data type of current value of the selected Arg or Local 803 * 804 * DESCRIPTION: Get the type of the object stored in the Local or Arg 805 * 806 ******************************************************************************/ 807 808ACPI_OBJECT_TYPE 809AcpiDsMethodDataGetType ( 810 UINT16 Opcode, 811 UINT32 Index, 812 ACPI_WALK_STATE *WalkState) 813{ 814 ACPI_STATUS Status; 815 ACPI_NAMESPACE_NODE *Node; 816 ACPI_OPERAND_OBJECT *Object; 817 818 819 ACPI_FUNCTION_TRACE ("DsMethodDataGetType"); 820 821 822 /* Get the namespace node for the arg/local */ 823 824 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 825 if (ACPI_FAILURE (Status)) 826 { 827 return_VALUE ((ACPI_TYPE_NOT_FOUND)); 828 } 829 830 /* Get the object */ 831 832 Object = AcpiNsGetAttachedObject (Node); 833 if (!Object) 834 { 835 /* Uninitialized local/arg, return TYPE_ANY */ 836 837 return_VALUE (ACPI_TYPE_ANY); 838 } 839 840 /* Get the object type */ 841 842 return_VALUE (ACPI_GET_OBJECT_TYPE (Object)); 843} 844#endif 845 846 847