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 - 2013, 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 = ANOBJ_METHOD_ARG; 192 } 193 194 /* Init the method locals */ 195 196 for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++) 197 { 198 ACPI_MOVE_32_TO_32 (&WalkState->LocalVariables[i].Name, NAMEOF_LOCAL_NTE); 199 200 WalkState->LocalVariables[i].Name.Integer |= (i << 24); 201 WalkState->LocalVariables[i].DescriptorType = ACPI_DESC_TYPE_NAMED; 202 WalkState->LocalVariables[i].Type = ACPI_TYPE_ANY; 203 WalkState->LocalVariables[i].Flags = ANOBJ_METHOD_LOCAL; 204 } 205 206 return_VOID; 207 } 208 209 210 /******************************************************************************* 211 * 212 * FUNCTION: AcpiDsMethodDataDeleteAll 213 * 214 * PARAMETERS: WalkState - Current walk state object 215 * 216 * RETURN: None 217 * 218 * DESCRIPTION: Delete method locals and arguments. Arguments are only 219 * deleted if this method was called from another method. 220 * 221 ******************************************************************************/ 222 223 void 224 AcpiDsMethodDataDeleteAll ( 225 ACPI_WALK_STATE *WalkState) 226 { 227 UINT32 Index; 228 229 230 ACPI_FUNCTION_TRACE (DsMethodDataDeleteAll); 231 232 233 /* Detach the locals */ 234 235 for (Index = 0; Index < ACPI_METHOD_NUM_LOCALS; Index++) 236 { 237 if (WalkState->LocalVariables[Index].Object) 238 { 239 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%u=%p\n", 240 Index, WalkState->LocalVariables[Index].Object)); 241 242 /* Detach object (if present) and remove a reference */ 243 244 AcpiNsDetachObject (&WalkState->LocalVariables[Index]); 245 } 246 } 247 248 /* Detach the arguments */ 249 250 for (Index = 0; Index < ACPI_METHOD_NUM_ARGS; Index++) 251 { 252 if (WalkState->Arguments[Index].Object) 253 { 254 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%u=%p\n", 255 Index, WalkState->Arguments[Index].Object)); 256 257 /* Detach object (if present) and remove a reference */ 258 259 AcpiNsDetachObject (&WalkState->Arguments[Index]); 260 } 261 } 262 263 return_VOID; 264 } 265 266 267 /******************************************************************************* 268 * 269 * FUNCTION: AcpiDsMethodDataInitArgs 270 * 271 * PARAMETERS: *Params - Pointer to a parameter list for the method 272 * MaxParamCount - The arg count for this method 273 * WalkState - Current walk state object 274 * 275 * RETURN: Status 276 * 277 * DESCRIPTION: Initialize arguments for a method. The parameter list is a list 278 * of ACPI operand objects, either null terminated or whose length 279 * is defined by MaxParamCount. 280 * 281 ******************************************************************************/ 282 283 ACPI_STATUS 284 AcpiDsMethodDataInitArgs ( 285 ACPI_OPERAND_OBJECT **Params, 286 UINT32 MaxParamCount, 287 ACPI_WALK_STATE *WalkState) 288 { 289 ACPI_STATUS Status; 290 UINT32 Index = 0; 291 292 293 ACPI_FUNCTION_TRACE_PTR (DsMethodDataInitArgs, Params); 294 295 296 if (!Params) 297 { 298 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "No param list passed to method\n")); 299 return_ACPI_STATUS (AE_OK); 300 } 301 302 /* Copy passed parameters into the new method stack frame */ 303 304 while ((Index < ACPI_METHOD_NUM_ARGS) && 305 (Index < MaxParamCount) && 306 Params[Index]) 307 { 308 /* 309 * A valid parameter. 310 * Store the argument in the method/walk descriptor. 311 * Do not copy the arg in order to implement call by reference 312 */ 313 Status = AcpiDsMethodDataSetValue (ACPI_REFCLASS_ARG, Index, 314 Params[Index], WalkState); 315 if (ACPI_FAILURE (Status)) 316 { 317 return_ACPI_STATUS (Status); 318 } 319 320 Index++; 321 } 322 323 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%u args passed to method\n", Index)); 324 return_ACPI_STATUS (AE_OK); 325 } 326 327 328 /******************************************************************************* 329 * 330 * FUNCTION: AcpiDsMethodDataGetNode 331 * 332 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or 333 * ACPI_REFCLASS_ARG 334 * Index - Which Local or Arg whose type to get 335 * WalkState - Current walk state object 336 * Node - Where the node is returned. 337 * 338 * RETURN: Status and node 339 * 340 * DESCRIPTION: Get the Node associated with a local or arg. 341 * 342 ******************************************************************************/ 343 344 ACPI_STATUS 345 AcpiDsMethodDataGetNode ( 346 UINT8 Type, 347 UINT32 Index, 348 ACPI_WALK_STATE *WalkState, 349 ACPI_NAMESPACE_NODE **Node) 350 { 351 ACPI_FUNCTION_TRACE (DsMethodDataGetNode); 352 353 354 /* 355 * Method Locals and Arguments are supported 356 */ 357 switch (Type) 358 { 359 case ACPI_REFCLASS_LOCAL: 360 361 if (Index > ACPI_METHOD_MAX_LOCAL) 362 { 363 ACPI_ERROR ((AE_INFO, 364 "Local index %u is invalid (max %u)", 365 Index, ACPI_METHOD_MAX_LOCAL)); 366 return_ACPI_STATUS (AE_AML_INVALID_INDEX); 367 } 368 369 /* Return a pointer to the pseudo-node */ 370 371 *Node = &WalkState->LocalVariables[Index]; 372 break; 373 374 case ACPI_REFCLASS_ARG: 375 376 if (Index > ACPI_METHOD_MAX_ARG) 377 { 378 ACPI_ERROR ((AE_INFO, 379 "Arg index %u is invalid (max %u)", 380 Index, ACPI_METHOD_MAX_ARG)); 381 return_ACPI_STATUS (AE_AML_INVALID_INDEX); 382 } 383 384 /* Return a pointer to the pseudo-node */ 385 386 *Node = &WalkState->Arguments[Index]; 387 break; 388 389 default: 390 391 ACPI_ERROR ((AE_INFO, "Type %u is invalid", Type)); 392 return_ACPI_STATUS (AE_TYPE); 393 } 394 395 return_ACPI_STATUS (AE_OK); 396 } 397 398 399 /******************************************************************************* 400 * 401 * FUNCTION: AcpiDsMethodDataSetValue 402 * 403 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or 404 * ACPI_REFCLASS_ARG 405 * Index - Which Local or Arg to get 406 * Object - Object to be inserted into the stack entry 407 * WalkState - Current walk state object 408 * 409 * RETURN: Status 410 * 411 * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index. 412 * Note: There is no "implicit conversion" for locals. 413 * 414 ******************************************************************************/ 415 416 static ACPI_STATUS 417 AcpiDsMethodDataSetValue ( 418 UINT8 Type, 419 UINT32 Index, 420 ACPI_OPERAND_OBJECT *Object, 421 ACPI_WALK_STATE *WalkState) 422 { 423 ACPI_STATUS Status; 424 ACPI_NAMESPACE_NODE *Node; 425 426 427 ACPI_FUNCTION_TRACE (DsMethodDataSetValue); 428 429 430 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 431 "NewObj %p Type %2.2X, Refs=%u [%s]\n", Object, 432 Type, Object->Common.ReferenceCount, 433 AcpiUtGetTypeName (Object->Common.Type))); 434 435 /* Get the namespace node for the arg/local */ 436 437 Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node); 438 if (ACPI_FAILURE (Status)) 439 { 440 return_ACPI_STATUS (Status); 441 } 442 443 /* 444 * Increment ref count so object can't be deleted while installed. 445 * NOTE: We do not copy the object in order to preserve the call by 446 * reference semantics of ACPI Control Method invocation. 447 * (See ACPI Specification 2.0C) 448 */ 449 AcpiUtAddReference (Object); 450 451 /* Install the object */ 452 453 Node->Object = Object; 454 return_ACPI_STATUS (Status); 455 } 456 457 458 /******************************************************************************* 459 * 460 * FUNCTION: AcpiDsMethodDataGetValue 461 * 462 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or 463 * ACPI_REFCLASS_ARG 464 * Index - Which localVar or argument to get 465 * WalkState - Current walk state object 466 * DestDesc - Where Arg or Local value is returned 467 * 468 * RETURN: Status 469 * 470 * DESCRIPTION: Retrieve value of selected Arg or Local for this method 471 * Used only in AcpiExResolveToValue(). 472 * 473 ******************************************************************************/ 474 475 ACPI_STATUS 476 AcpiDsMethodDataGetValue ( 477 UINT8 Type, 478 UINT32 Index, 479 ACPI_WALK_STATE *WalkState, 480 ACPI_OPERAND_OBJECT **DestDesc) 481 { 482 ACPI_STATUS Status; 483 ACPI_NAMESPACE_NODE *Node; 484 ACPI_OPERAND_OBJECT *Object; 485 486 487 ACPI_FUNCTION_TRACE (DsMethodDataGetValue); 488 489 490 /* Validate the object descriptor */ 491 492 if (!DestDesc) 493 { 494 ACPI_ERROR ((AE_INFO, "Null object descriptor pointer")); 495 return_ACPI_STATUS (AE_BAD_PARAMETER); 496 } 497 498 /* Get the namespace node for the arg/local */ 499 500 Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node); 501 if (ACPI_FAILURE (Status)) 502 { 503 return_ACPI_STATUS (Status); 504 } 505 506 /* Get the object from the node */ 507 508 Object = Node->Object; 509 510 /* Examine the returned object, it must be valid. */ 511 512 if (!Object) 513 { 514 /* 515 * Index points to uninitialized object. 516 * This means that either 1) The expected argument was 517 * not passed to the method, or 2) A local variable 518 * was referenced by the method (via the ASL) 519 * before it was initialized. Either case is an error. 520 */ 521 522 /* If slack enabled, init the LocalX/ArgX to an Integer of value zero */ 523 524 if (AcpiGbl_EnableInterpreterSlack) 525 { 526 Object = AcpiUtCreateIntegerObject ((UINT64) 0); 527 if (!Object) 528 { 529 return_ACPI_STATUS (AE_NO_MEMORY); 530 } 531 532 Node->Object = Object; 533 } 534 535 /* Otherwise, return the error */ 536 537 else switch (Type) 538 { 539 case ACPI_REFCLASS_ARG: 540 541 ACPI_ERROR ((AE_INFO, 542 "Uninitialized Arg[%u] at node %p", 543 Index, Node)); 544 545 return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG); 546 547 case ACPI_REFCLASS_LOCAL: 548 /* 549 * No error message for this case, will be trapped again later to 550 * detect and ignore cases of Store(LocalX,LocalX) 551 */ 552 return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL); 553 554 default: 555 556 ACPI_ERROR ((AE_INFO, "Not a Arg/Local opcode: 0x%X", Type)); 557 return_ACPI_STATUS (AE_AML_INTERNAL); 558 } 559 } 560 561 /* 562 * The Index points to an initialized and valid object. 563 * Return an additional reference to the object 564 */ 565 *DestDesc = Object; 566 AcpiUtAddReference (Object); 567 568 return_ACPI_STATUS (AE_OK); 569 } 570 571 572 /******************************************************************************* 573 * 574 * FUNCTION: AcpiDsMethodDataDeleteValue 575 * 576 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or 577 * ACPI_REFCLASS_ARG 578 * Index - Which localVar or argument to delete 579 * WalkState - Current walk state object 580 * 581 * RETURN: None 582 * 583 * DESCRIPTION: Delete the entry at Opcode:Index. Inserts 584 * a null into the stack slot after the object is deleted. 585 * 586 ******************************************************************************/ 587 588 static void 589 AcpiDsMethodDataDeleteValue ( 590 UINT8 Type, 591 UINT32 Index, 592 ACPI_WALK_STATE *WalkState) 593 { 594 ACPI_STATUS Status; 595 ACPI_NAMESPACE_NODE *Node; 596 ACPI_OPERAND_OBJECT *Object; 597 598 599 ACPI_FUNCTION_TRACE (DsMethodDataDeleteValue); 600 601 602 /* Get the namespace node for the arg/local */ 603 604 Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node); 605 if (ACPI_FAILURE (Status)) 606 { 607 return_VOID; 608 } 609 610 /* Get the associated object */ 611 612 Object = AcpiNsGetAttachedObject (Node); 613 614 /* 615 * Undefine the Arg or Local by setting its descriptor 616 * pointer to NULL. Locals/Args can contain both 617 * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs 618 */ 619 Node->Object = NULL; 620 621 if ((Object) && 622 (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_OPERAND)) 623 { 624 /* 625 * There is a valid object. 626 * Decrement the reference count by one to balance the 627 * increment when the object was stored. 628 */ 629 AcpiUtRemoveReference (Object); 630 } 631 632 return_VOID; 633 } 634 635 636 /******************************************************************************* 637 * 638 * FUNCTION: AcpiDsStoreObjectToLocal 639 * 640 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or 641 * ACPI_REFCLASS_ARG 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 ******************************************************************************/ 653 654 ACPI_STATUS 655 AcpiDsStoreObjectToLocal ( 656 UINT8 Type, 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, "Type=%2.2X Index=%u Obj=%p\n", 669 Type, 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 (Type, 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 (Type == ACPI_REFCLASS_ARG) 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.Class == ACPI_REFCLASS_REFOF)) 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 /* Delete the existing object before storing the new one */ 769 770 AcpiDsMethodDataDeleteValue (Type, Index, WalkState); 771 } 772 773 /* 774 * Install the Obj descriptor (*NewObjDesc) into 775 * the descriptor for the Arg or Local. 776 * (increments the object reference count by one) 777 */ 778 Status = AcpiDsMethodDataSetValue (Type, Index, NewObjDesc, WalkState); 779 780 /* Remove local reference if we copied the object above */ 781 782 if (NewObjDesc != ObjDesc) 783 { 784 AcpiUtRemoveReference (NewObjDesc); 785 } 786 787 return_ACPI_STATUS (Status); 788 } 789 790 791 #ifdef ACPI_OBSOLETE_FUNCTIONS 792 /******************************************************************************* 793 * 794 * FUNCTION: AcpiDsMethodDataGetType 795 * 796 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 797 * Index - Which Local or Arg whose type to get 798 * WalkState - Current walk state object 799 * 800 * RETURN: Data type of current value of the selected Arg or Local 801 * 802 * DESCRIPTION: Get the type of the object stored in the Local or Arg 803 * 804 ******************************************************************************/ 805 806 ACPI_OBJECT_TYPE 807 AcpiDsMethodDataGetType ( 808 UINT16 Opcode, 809 UINT32 Index, 810 ACPI_WALK_STATE *WalkState) 811 { 812 ACPI_STATUS Status; 813 ACPI_NAMESPACE_NODE *Node; 814 ACPI_OPERAND_OBJECT *Object; 815 816 817 ACPI_FUNCTION_TRACE (DsMethodDataGetType); 818 819 820 /* Get the namespace node for the arg/local */ 821 822 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 823 if (ACPI_FAILURE (Status)) 824 { 825 return_VALUE ((ACPI_TYPE_NOT_FOUND)); 826 } 827 828 /* Get the object */ 829 830 Object = AcpiNsGetAttachedObject (Node); 831 if (!Object) 832 { 833 /* Uninitialized local/arg, return TYPE_ANY */ 834 835 return_VALUE (ACPI_TYPE_ANY); 836 } 837 838 /* Get the object type */ 839 840 return_VALUE (Object->Type); 841 } 842 #endif 843