1 /******************************************************************************* 2 * 3 * Module Name: dsmthdat - control method arguments and local variables 4 * 5 ******************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 *****************************************************************************/ 115 116 #define __DSMTHDAT_C__ 117 118 #include "acpi.h" 119 #include "accommon.h" 120 #include "acdispat.h" 121 #include "acnamesp.h" 122 #include "acinterp.h" 123 124 125 #define _COMPONENT ACPI_DISPATCHER 126 ACPI_MODULE_NAME ("dsmthdat") 127 128 /* Local prototypes */ 129 130 static void 131 AcpiDsMethodDataDeleteValue ( 132 UINT8 Type, 133 UINT32 Index, 134 ACPI_WALK_STATE *WalkState); 135 136 static ACPI_STATUS 137 AcpiDsMethodDataSetValue ( 138 UINT8 Type, 139 UINT32 Index, 140 ACPI_OPERAND_OBJECT *Object, 141 ACPI_WALK_STATE *WalkState); 142 143 #ifdef ACPI_OBSOLETE_FUNCTIONS 144 ACPI_OBJECT_TYPE 145 AcpiDsMethodDataGetType ( 146 UINT16 Opcode, 147 UINT32 Index, 148 ACPI_WALK_STATE *WalkState); 149 #endif 150 151 152 /******************************************************************************* 153 * 154 * FUNCTION: AcpiDsMethodDataInit 155 * 156 * PARAMETERS: WalkState - Current walk state object 157 * 158 * RETURN: Status 159 * 160 * DESCRIPTION: Initialize the data structures that hold the method's arguments 161 * and locals. The data struct is an array of namespace nodes for 162 * each - this allows RefOf and DeRefOf to work properly for these 163 * special data types. 164 * 165 * NOTES: WalkState fields are initialized to zero by the 166 * ACPI_ALLOCATE_ZEROED(). 167 * 168 * A pseudo-Namespace Node is assigned to each argument and local 169 * so that RefOf() can return a pointer to the Node. 170 * 171 ******************************************************************************/ 172 173 void 174 AcpiDsMethodDataInit ( 175 ACPI_WALK_STATE *WalkState) 176 { 177 UINT32 i; 178 179 180 ACPI_FUNCTION_TRACE (DsMethodDataInit); 181 182 183 /* Init the method arguments */ 184 185 for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) 186 { 187 ACPI_MOVE_32_TO_32 (&WalkState->Arguments[i].Name, NAMEOF_ARG_NTE); 188 WalkState->Arguments[i].Name.Integer |= (i << 24); 189 WalkState->Arguments[i].DescriptorType = ACPI_DESC_TYPE_NAMED; 190 WalkState->Arguments[i].Type = ACPI_TYPE_ANY; 191 WalkState->Arguments[i].Flags = 192 ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_ARG; 193 } 194 195 /* Init the method locals */ 196 197 for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++) 198 { 199 ACPI_MOVE_32_TO_32 (&WalkState->LocalVariables[i].Name, NAMEOF_LOCAL_NTE); 200 201 WalkState->LocalVariables[i].Name.Integer |= (i << 24); 202 WalkState->LocalVariables[i].DescriptorType = ACPI_DESC_TYPE_NAMED; 203 WalkState->LocalVariables[i].Type = ACPI_TYPE_ANY; 204 WalkState->LocalVariables[i].Flags = 205 ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_LOCAL; 206 } 207 208 return_VOID; 209 } 210 211 212 /******************************************************************************* 213 * 214 * FUNCTION: AcpiDsMethodDataDeleteAll 215 * 216 * PARAMETERS: WalkState - Current walk state object 217 * 218 * RETURN: None 219 * 220 * DESCRIPTION: Delete method locals and arguments. Arguments are only 221 * deleted if this method was called from another method. 222 * 223 ******************************************************************************/ 224 225 void 226 AcpiDsMethodDataDeleteAll ( 227 ACPI_WALK_STATE *WalkState) 228 { 229 UINT32 Index; 230 231 232 ACPI_FUNCTION_TRACE (DsMethodDataDeleteAll); 233 234 235 /* Detach the locals */ 236 237 for (Index = 0; Index < ACPI_METHOD_NUM_LOCALS; Index++) 238 { 239 if (WalkState->LocalVariables[Index].Object) 240 { 241 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%d=%p\n", 242 Index, WalkState->LocalVariables[Index].Object)); 243 244 /* Detach object (if present) and remove a reference */ 245 246 AcpiNsDetachObject (&WalkState->LocalVariables[Index]); 247 } 248 } 249 250 /* Detach the arguments */ 251 252 for (Index = 0; Index < ACPI_METHOD_NUM_ARGS; Index++) 253 { 254 if (WalkState->Arguments[Index].Object) 255 { 256 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%d=%p\n", 257 Index, WalkState->Arguments[Index].Object)); 258 259 /* Detach object (if present) and remove a reference */ 260 261 AcpiNsDetachObject (&WalkState->Arguments[Index]); 262 } 263 } 264 265 return_VOID; 266 } 267 268 269 /******************************************************************************* 270 * 271 * FUNCTION: AcpiDsMethodDataInitArgs 272 * 273 * PARAMETERS: *Params - Pointer to a parameter list for the method 274 * MaxParamCount - The arg count for this method 275 * WalkState - Current walk state object 276 * 277 * RETURN: Status 278 * 279 * DESCRIPTION: Initialize arguments for a method. The parameter list is a list 280 * of ACPI operand objects, either null terminated or whose length 281 * is defined by MaxParamCount. 282 * 283 ******************************************************************************/ 284 285 ACPI_STATUS 286 AcpiDsMethodDataInitArgs ( 287 ACPI_OPERAND_OBJECT **Params, 288 UINT32 MaxParamCount, 289 ACPI_WALK_STATE *WalkState) 290 { 291 ACPI_STATUS Status; 292 UINT32 Index = 0; 293 294 295 ACPI_FUNCTION_TRACE_PTR (DsMethodDataInitArgs, Params); 296 297 298 if (!Params) 299 { 300 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "No param list passed to method\n")); 301 return_ACPI_STATUS (AE_OK); 302 } 303 304 /* Copy passed parameters into the new method stack frame */ 305 306 while ((Index < ACPI_METHOD_NUM_ARGS) && 307 (Index < MaxParamCount) && 308 Params[Index]) 309 { 310 /* 311 * A valid parameter. 312 * Store the argument in the method/walk descriptor. 313 * Do not copy the arg in order to implement call by reference 314 */ 315 Status = AcpiDsMethodDataSetValue (ACPI_REFCLASS_ARG, Index, 316 Params[Index], WalkState); 317 if (ACPI_FAILURE (Status)) 318 { 319 return_ACPI_STATUS (Status); 320 } 321 322 Index++; 323 } 324 325 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%d args passed to method\n", Index)); 326 return_ACPI_STATUS (AE_OK); 327 } 328 329 330 /******************************************************************************* 331 * 332 * FUNCTION: AcpiDsMethodDataGetNode 333 * 334 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or 335 * ACPI_REFCLASS_ARG 336 * Index - Which Local or Arg whose type to get 337 * WalkState - Current walk state object 338 * Node - Where the node is returned. 339 * 340 * RETURN: Status and node 341 * 342 * DESCRIPTION: Get the Node associated with a local or arg. 343 * 344 ******************************************************************************/ 345 346 ACPI_STATUS 347 AcpiDsMethodDataGetNode ( 348 UINT8 Type, 349 UINT32 Index, 350 ACPI_WALK_STATE *WalkState, 351 ACPI_NAMESPACE_NODE **Node) 352 { 353 ACPI_FUNCTION_TRACE (DsMethodDataGetNode); 354 355 356 /* 357 * Method Locals and Arguments are supported 358 */ 359 switch (Type) 360 { 361 case ACPI_REFCLASS_LOCAL: 362 363 if (Index > ACPI_METHOD_MAX_LOCAL) 364 { 365 ACPI_ERROR ((AE_INFO, 366 "Local index %d is invalid (max %d)", 367 Index, ACPI_METHOD_MAX_LOCAL)); 368 return_ACPI_STATUS (AE_AML_INVALID_INDEX); 369 } 370 371 /* Return a pointer to the pseudo-node */ 372 373 *Node = &WalkState->LocalVariables[Index]; 374 break; 375 376 case ACPI_REFCLASS_ARG: 377 378 if (Index > ACPI_METHOD_MAX_ARG) 379 { 380 ACPI_ERROR ((AE_INFO, 381 "Arg index %d is invalid (max %d)", 382 Index, ACPI_METHOD_MAX_ARG)); 383 return_ACPI_STATUS (AE_AML_INVALID_INDEX); 384 } 385 386 /* Return a pointer to the pseudo-node */ 387 388 *Node = &WalkState->Arguments[Index]; 389 break; 390 391 default: 392 ACPI_ERROR ((AE_INFO, "Type %d is invalid", Type)); 393 return_ACPI_STATUS (AE_TYPE); 394 } 395 396 return_ACPI_STATUS (AE_OK); 397 } 398 399 400 /******************************************************************************* 401 * 402 * FUNCTION: AcpiDsMethodDataSetValue 403 * 404 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or 405 * ACPI_REFCLASS_ARG 406 * Index - Which Local or Arg to get 407 * Object - Object to be inserted into the stack entry 408 * WalkState - Current walk state object 409 * 410 * RETURN: Status 411 * 412 * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index. 413 * Note: There is no "implicit conversion" for locals. 414 * 415 ******************************************************************************/ 416 417 static ACPI_STATUS 418 AcpiDsMethodDataSetValue ( 419 UINT8 Type, 420 UINT32 Index, 421 ACPI_OPERAND_OBJECT *Object, 422 ACPI_WALK_STATE *WalkState) 423 { 424 ACPI_STATUS Status; 425 ACPI_NAMESPACE_NODE *Node; 426 427 428 ACPI_FUNCTION_TRACE (DsMethodDataSetValue); 429 430 431 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 432 "NewObj %p Type %2.2X, Refs=%d [%s]\n", Object, 433 Type, Object->Common.ReferenceCount, 434 AcpiUtGetTypeName (Object->Common.Type))); 435 436 /* Get the namespace node for the arg/local */ 437 438 Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node); 439 if (ACPI_FAILURE (Status)) 440 { 441 return_ACPI_STATUS (Status); 442 } 443 444 /* 445 * Increment ref count so object can't be deleted while installed. 446 * NOTE: We do not copy the object in order to preserve the call by 447 * reference semantics of ACPI Control Method invocation. 448 * (See ACPI Specification 2.0C) 449 */ 450 AcpiUtAddReference (Object); 451 452 /* Install the object */ 453 454 Node->Object = Object; 455 return_ACPI_STATUS (Status); 456 } 457 458 459 /******************************************************************************* 460 * 461 * FUNCTION: AcpiDsMethodDataGetValue 462 * 463 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or 464 * ACPI_REFCLASS_ARG 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 ******************************************************************************/ 475 476 ACPI_STATUS 477 AcpiDsMethodDataGetValue ( 478 UINT8 Type, 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_ERROR ((AE_INFO, "Null object descriptor pointer")); 496 return_ACPI_STATUS (AE_BAD_PARAMETER); 497 } 498 499 /* Get the namespace node for the arg/local */ 500 501 Status = AcpiDsMethodDataGetNode (Type, 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 = AcpiUtCreateIntegerObject ((UINT64) 0); 528 if (!Object) 529 { 530 return_ACPI_STATUS (AE_NO_MEMORY); 531 } 532 533 Node->Object = Object; 534 } 535 536 /* Otherwise, return the error */ 537 538 else switch (Type) 539 { 540 case ACPI_REFCLASS_ARG: 541 542 ACPI_ERROR ((AE_INFO, 543 "Uninitialized Arg[%d] at node %p", 544 Index, Node)); 545 546 return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG); 547 548 case ACPI_REFCLASS_LOCAL: 549 550 /* 551 * No error message for this case, will be trapped again later to 552 * detect and ignore cases of Store(LocalX,LocalX) 553 */ 554 return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL); 555 556 default: 557 558 ACPI_ERROR ((AE_INFO, "Not a Arg/Local opcode: %X", Type)); 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: Type - Either ACPI_REFCLASS_LOCAL or 579 * ACPI_REFCLASS_ARG 580 * Index - Which localVar or argument to delete 581 * WalkState - Current walk state object 582 * 583 * RETURN: None 584 * 585 * DESCRIPTION: Delete the entry at Opcode:Index. Inserts 586 * a null into the stack slot after the object is deleted. 587 * 588 ******************************************************************************/ 589 590 static void 591 AcpiDsMethodDataDeleteValue ( 592 UINT8 Type, 593 UINT32 Index, 594 ACPI_WALK_STATE *WalkState) 595 { 596 ACPI_STATUS Status; 597 ACPI_NAMESPACE_NODE *Node; 598 ACPI_OPERAND_OBJECT *Object; 599 600 601 ACPI_FUNCTION_TRACE (DsMethodDataDeleteValue); 602 603 604 /* Get the namespace node for the arg/local */ 605 606 Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node); 607 if (ACPI_FAILURE (Status)) 608 { 609 return_VOID; 610 } 611 612 /* Get the associated object */ 613 614 Object = AcpiNsGetAttachedObject (Node); 615 616 /* 617 * Undefine the Arg or Local by setting its descriptor 618 * pointer to NULL. Locals/Args can contain both 619 * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs 620 */ 621 Node->Object = NULL; 622 623 if ((Object) && 624 (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_OPERAND)) 625 { 626 /* 627 * There is a valid object. 628 * Decrement the reference count by one to balance the 629 * increment when the object was stored. 630 */ 631 AcpiUtRemoveReference (Object); 632 } 633 634 return_VOID; 635 } 636 637 638 /******************************************************************************* 639 * 640 * FUNCTION: AcpiDsStoreObjectToLocal 641 * 642 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or 643 * ACPI_REFCLASS_ARG 644 * Index - Which Local or Arg to set 645 * ObjDesc - Value to be stored 646 * WalkState - Current walk state 647 * 648 * RETURN: Status 649 * 650 * DESCRIPTION: Store a value in an Arg or Local. The ObjDesc is installed 651 * as the new value for the Arg or Local and the reference count 652 * for ObjDesc is incremented. 653 * 654 ******************************************************************************/ 655 656 ACPI_STATUS 657 AcpiDsStoreObjectToLocal ( 658 UINT8 Type, 659 UINT32 Index, 660 ACPI_OPERAND_OBJECT *ObjDesc, 661 ACPI_WALK_STATE *WalkState) 662 { 663 ACPI_STATUS Status; 664 ACPI_NAMESPACE_NODE *Node; 665 ACPI_OPERAND_OBJECT *CurrentObjDesc; 666 ACPI_OPERAND_OBJECT *NewObjDesc; 667 668 669 ACPI_FUNCTION_TRACE (DsStoreObjectToLocal); 670 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Type=%2.2X Index=%d Obj=%p\n", 671 Type, Index, ObjDesc)); 672 673 /* Parameter validation */ 674 675 if (!ObjDesc) 676 { 677 return_ACPI_STATUS (AE_BAD_PARAMETER); 678 } 679 680 /* Get the namespace node for the arg/local */ 681 682 Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node); 683 if (ACPI_FAILURE (Status)) 684 { 685 return_ACPI_STATUS (Status); 686 } 687 688 CurrentObjDesc = AcpiNsGetAttachedObject (Node); 689 if (CurrentObjDesc == ObjDesc) 690 { 691 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p already installed!\n", 692 ObjDesc)); 693 return_ACPI_STATUS (Status); 694 } 695 696 /* 697 * If the reference count on the object is more than one, we must 698 * take a copy of the object before we store. A reference count 699 * of exactly 1 means that the object was just created during the 700 * evaluation of an expression, and we can safely use it since it 701 * is not used anywhere else. 702 */ 703 NewObjDesc = ObjDesc; 704 if (ObjDesc->Common.ReferenceCount > 1) 705 { 706 Status = AcpiUtCopyIobjectToIobject (ObjDesc, &NewObjDesc, WalkState); 707 if (ACPI_FAILURE (Status)) 708 { 709 return_ACPI_STATUS (Status); 710 } 711 } 712 713 /* 714 * If there is an object already in this slot, we either 715 * have to delete it, or if this is an argument and there 716 * is an object reference stored there, we have to do 717 * an indirect store! 718 */ 719 if (CurrentObjDesc) 720 { 721 /* 722 * Check for an indirect store if an argument 723 * contains an object reference (stored as an Node). 724 * We don't allow this automatic dereferencing for 725 * locals, since a store to a local should overwrite 726 * anything there, including an object reference. 727 * 728 * If both Arg0 and Local0 contain RefOf (Local4): 729 * 730 * Store (1, Arg0) - Causes indirect store to local4 731 * Store (1, Local0) - Stores 1 in local0, overwriting 732 * the reference to local4 733 * Store (1, DeRefof (Local0)) - Causes indirect store to local4 734 * 735 * Weird, but true. 736 */ 737 if (Type == ACPI_REFCLASS_ARG) 738 { 739 /* 740 * If we have a valid reference object that came from RefOf(), 741 * do the indirect store 742 */ 743 if ((ACPI_GET_DESCRIPTOR_TYPE (CurrentObjDesc) == ACPI_DESC_TYPE_OPERAND) && 744 (CurrentObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) && 745 (CurrentObjDesc->Reference.Class == ACPI_REFCLASS_REFOF)) 746 { 747 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 748 "Arg (%p) is an ObjRef(Node), storing in node %p\n", 749 NewObjDesc, CurrentObjDesc)); 750 751 /* 752 * Store this object to the Node (perform the indirect store) 753 * NOTE: No implicit conversion is performed, as per the ACPI 754 * specification rules on storing to Locals/Args. 755 */ 756 Status = AcpiExStoreObjectToNode (NewObjDesc, 757 CurrentObjDesc->Reference.Object, WalkState, 758 ACPI_NO_IMPLICIT_CONVERSION); 759 760 /* Remove local reference if we copied the object above */ 761 762 if (NewObjDesc != ObjDesc) 763 { 764 AcpiUtRemoveReference (NewObjDesc); 765 } 766 return_ACPI_STATUS (Status); 767 } 768 } 769 770 /* Delete the existing object before storing the new one */ 771 772 AcpiDsMethodDataDeleteValue (Type, 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 (Type, 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 ******************************************************************************/ 807 808 ACPI_OBJECT_TYPE 809 AcpiDsMethodDataGetType ( 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 (Object->Type); 843 } 844 #endif 845 846 847