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 - 2016, 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 #include "acpi.h" 117 #include "accommon.h" 118 #include "acdispat.h" 119 #include "acnamesp.h" 120 #include "acinterp.h" 121 122 123 #define _COMPONENT ACPI_DISPATCHER 124 ACPI_MODULE_NAME ("dsmthdat") 125 126 /* Local prototypes */ 127 128 static void 129 AcpiDsMethodDataDeleteValue ( 130 UINT8 Type, 131 UINT32 Index, 132 ACPI_WALK_STATE *WalkState); 133 134 static ACPI_STATUS 135 AcpiDsMethodDataSetValue ( 136 UINT8 Type, 137 UINT32 Index, 138 ACPI_OPERAND_OBJECT *Object, 139 ACPI_WALK_STATE *WalkState); 140 141 #ifdef ACPI_OBSOLETE_FUNCTIONS 142 ACPI_OBJECT_TYPE 143 AcpiDsMethodDataGetType ( 144 UINT16 Opcode, 145 UINT32 Index, 146 ACPI_WALK_STATE *WalkState); 147 #endif 148 149 150 /******************************************************************************* 151 * 152 * FUNCTION: AcpiDsMethodDataInit 153 * 154 * PARAMETERS: WalkState - Current walk state object 155 * 156 * RETURN: Status 157 * 158 * DESCRIPTION: Initialize the data structures that hold the method's arguments 159 * and locals. The data struct is an array of namespace nodes for 160 * each - this allows RefOf and DeRefOf to work properly for these 161 * special data types. 162 * 163 * NOTES: WalkState fields are initialized to zero by the 164 * ACPI_ALLOCATE_ZEROED(). 165 * 166 * A pseudo-Namespace Node is assigned to each argument and local 167 * so that RefOf() can return a pointer to the Node. 168 * 169 ******************************************************************************/ 170 171 void 172 AcpiDsMethodDataInit ( 173 ACPI_WALK_STATE *WalkState) 174 { 175 UINT32 i; 176 177 178 ACPI_FUNCTION_TRACE (DsMethodDataInit); 179 180 181 /* Init the method arguments */ 182 183 for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) 184 { 185 ACPI_MOVE_32_TO_32 (&WalkState->Arguments[i].Name, 186 NAMEOF_ARG_NTE); 187 188 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, 199 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 = ANOBJ_METHOD_LOCAL; 205 } 206 207 return_VOID; 208 } 209 210 211 /******************************************************************************* 212 * 213 * FUNCTION: AcpiDsMethodDataDeleteAll 214 * 215 * PARAMETERS: WalkState - Current walk state object 216 * 217 * RETURN: None 218 * 219 * DESCRIPTION: Delete method locals and arguments. Arguments are only 220 * deleted if this method was called from another method. 221 * 222 ******************************************************************************/ 223 224 void 225 AcpiDsMethodDataDeleteAll ( 226 ACPI_WALK_STATE *WalkState) 227 { 228 UINT32 Index; 229 230 231 ACPI_FUNCTION_TRACE (DsMethodDataDeleteAll); 232 233 234 /* Detach the locals */ 235 236 for (Index = 0; Index < ACPI_METHOD_NUM_LOCALS; Index++) 237 { 238 if (WalkState->LocalVariables[Index].Object) 239 { 240 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%u=%p\n", 241 Index, WalkState->LocalVariables[Index].Object)); 242 243 /* Detach object (if present) and remove a reference */ 244 245 AcpiNsDetachObject (&WalkState->LocalVariables[Index]); 246 } 247 } 248 249 /* Detach the arguments */ 250 251 for (Index = 0; Index < ACPI_METHOD_NUM_ARGS; Index++) 252 { 253 if (WalkState->Arguments[Index].Object) 254 { 255 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%u=%p\n", 256 Index, WalkState->Arguments[Index].Object)); 257 258 /* Detach object (if present) and remove a reference */ 259 260 AcpiNsDetachObject (&WalkState->Arguments[Index]); 261 } 262 } 263 264 return_VOID; 265 } 266 267 268 /******************************************************************************* 269 * 270 * FUNCTION: AcpiDsMethodDataInitArgs 271 * 272 * PARAMETERS: *Params - Pointer to a parameter list for the method 273 * MaxParamCount - The arg count for this method 274 * WalkState - Current walk state object 275 * 276 * RETURN: Status 277 * 278 * DESCRIPTION: Initialize arguments for a method. The parameter list is a list 279 * of ACPI operand objects, either null terminated or whose length 280 * is defined by MaxParamCount. 281 * 282 ******************************************************************************/ 283 284 ACPI_STATUS 285 AcpiDsMethodDataInitArgs ( 286 ACPI_OPERAND_OBJECT **Params, 287 UINT32 MaxParamCount, 288 ACPI_WALK_STATE *WalkState) 289 { 290 ACPI_STATUS Status; 291 UINT32 Index = 0; 292 293 294 ACPI_FUNCTION_TRACE_PTR (DsMethodDataInitArgs, Params); 295 296 297 if (!Params) 298 { 299 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 300 "No parameter 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 ( 316 ACPI_REFCLASS_ARG, Index, 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, "%u 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 %u is invalid (max %u)", 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 %u is invalid (max %u)", 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: 392 393 ACPI_ERROR ((AE_INFO, "Type %u is invalid", Type)); 394 return_ACPI_STATUS (AE_TYPE); 395 } 396 397 return_ACPI_STATUS (AE_OK); 398 } 399 400 401 /******************************************************************************* 402 * 403 * FUNCTION: AcpiDsMethodDataSetValue 404 * 405 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or 406 * ACPI_REFCLASS_ARG 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 ******************************************************************************/ 417 418 static ACPI_STATUS 419 AcpiDsMethodDataSetValue ( 420 UINT8 Type, 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 Type %2.2X, Refs=%u [%s]\n", Object, 434 Type, Object->Common.ReferenceCount, 435 AcpiUtGetTypeName (Object->Common.Type))); 436 437 /* Get the namespace node for the arg/local */ 438 439 Status = AcpiDsMethodDataGetNode (Type, 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: Type - Either ACPI_REFCLASS_LOCAL or 465 * ACPI_REFCLASS_ARG 466 * Index - Which localVar or argument to get 467 * WalkState - Current walk state object 468 * DestDesc - Where Arg or Local value is returned 469 * 470 * RETURN: Status 471 * 472 * DESCRIPTION: Retrieve value of selected Arg or Local for this method 473 * Used only in AcpiExResolveToValue(). 474 * 475 ******************************************************************************/ 476 477 ACPI_STATUS 478 AcpiDsMethodDataGetValue ( 479 UINT8 Type, 480 UINT32 Index, 481 ACPI_WALK_STATE *WalkState, 482 ACPI_OPERAND_OBJECT **DestDesc) 483 { 484 ACPI_STATUS Status; 485 ACPI_NAMESPACE_NODE *Node; 486 ACPI_OPERAND_OBJECT *Object; 487 488 489 ACPI_FUNCTION_TRACE (DsMethodDataGetValue); 490 491 492 /* Validate the object descriptor */ 493 494 if (!DestDesc) 495 { 496 ACPI_ERROR ((AE_INFO, "Null object descriptor pointer")); 497 return_ACPI_STATUS (AE_BAD_PARAMETER); 498 } 499 500 /* Get the namespace node for the arg/local */ 501 502 Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node); 503 if (ACPI_FAILURE (Status)) 504 { 505 return_ACPI_STATUS (Status); 506 } 507 508 /* Get the object from the node */ 509 510 Object = Node->Object; 511 512 /* Examine the returned object, it must be valid. */ 513 514 if (!Object) 515 { 516 /* 517 * Index points to uninitialized object. 518 * This means that either 1) The expected argument was 519 * not passed to the method, or 2) A local variable 520 * was referenced by the method (via the ASL) 521 * before it was initialized. Either case is an error. 522 */ 523 524 /* If slack enabled, init the LocalX/ArgX to an Integer of value zero */ 525 526 if (AcpiGbl_EnableInterpreterSlack) 527 { 528 Object = AcpiUtCreateIntegerObject ((UINT64) 0); 529 if (!Object) 530 { 531 return_ACPI_STATUS (AE_NO_MEMORY); 532 } 533 534 Node->Object = Object; 535 } 536 537 /* Otherwise, return the error */ 538 539 else switch (Type) 540 { 541 case ACPI_REFCLASS_ARG: 542 543 ACPI_ERROR ((AE_INFO, 544 "Uninitialized Arg[%u] at node %p", 545 Index, Node)); 546 547 return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG); 548 549 case ACPI_REFCLASS_LOCAL: 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: 0x%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=%u 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 ( 707 ObjDesc, &NewObjDesc, WalkState); 708 if (ACPI_FAILURE (Status)) 709 { 710 return_ACPI_STATUS (Status); 711 } 712 } 713 714 /* 715 * If there is an object already in this slot, we either 716 * have to delete it, or if this is an argument and there 717 * is an object reference stored there, we have to do 718 * an indirect store! 719 */ 720 if (CurrentObjDesc) 721 { 722 /* 723 * Check for an indirect store if an argument 724 * contains an object reference (stored as an Node). 725 * We don't allow this automatic dereferencing for 726 * locals, since a store to a local should overwrite 727 * anything there, including an object reference. 728 * 729 * If both Arg0 and Local0 contain RefOf (Local4): 730 * 731 * Store (1, Arg0) - Causes indirect store to local4 732 * Store (1, Local0) - Stores 1 in local0, overwriting 733 * the reference to local4 734 * Store (1, DeRefof (Local0)) - Causes indirect store to local4 735 * 736 * Weird, but true. 737 */ 738 if (Type == ACPI_REFCLASS_ARG) 739 { 740 /* 741 * If we have a valid reference object that came from RefOf(), 742 * do the indirect store 743 */ 744 if ((ACPI_GET_DESCRIPTOR_TYPE (CurrentObjDesc) == 745 ACPI_DESC_TYPE_OPERAND) && 746 (CurrentObjDesc->Common.Type == 747 ACPI_TYPE_LOCAL_REFERENCE) && 748 (CurrentObjDesc->Reference.Class == 749 ACPI_REFCLASS_REFOF)) 750 { 751 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 752 "Arg (%p) is an ObjRef(Node), storing in node %p\n", 753 NewObjDesc, CurrentObjDesc)); 754 755 /* 756 * Store this object to the Node (perform the indirect store) 757 * NOTE: No implicit conversion is performed, as per the ACPI 758 * specification rules on storing to Locals/Args. 759 */ 760 Status = AcpiExStoreObjectToNode (NewObjDesc, 761 CurrentObjDesc->Reference.Object, WalkState, 762 ACPI_NO_IMPLICIT_CONVERSION); 763 764 /* Remove local reference if we copied the object above */ 765 766 if (NewObjDesc != ObjDesc) 767 { 768 AcpiUtRemoveReference (NewObjDesc); 769 } 770 771 return_ACPI_STATUS (Status); 772 } 773 } 774 775 /* Delete the existing object before storing the new one */ 776 777 AcpiDsMethodDataDeleteValue (Type, Index, WalkState); 778 } 779 780 /* 781 * Install the Obj descriptor (*NewObjDesc) into 782 * the descriptor for the Arg or Local. 783 * (increments the object reference count by one) 784 */ 785 Status = AcpiDsMethodDataSetValue (Type, Index, NewObjDesc, WalkState); 786 787 /* Remove local reference if we copied the object above */ 788 789 if (NewObjDesc != ObjDesc) 790 { 791 AcpiUtRemoveReference (NewObjDesc); 792 } 793 794 return_ACPI_STATUS (Status); 795 } 796 797 798 #ifdef ACPI_OBSOLETE_FUNCTIONS 799 /******************************************************************************* 800 * 801 * FUNCTION: AcpiDsMethodDataGetType 802 * 803 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP 804 * Index - Which Local or Arg whose type to get 805 * WalkState - Current walk state object 806 * 807 * RETURN: Data type of current value of the selected Arg or Local 808 * 809 * DESCRIPTION: Get the type of the object stored in the Local or Arg 810 * 811 ******************************************************************************/ 812 813 ACPI_OBJECT_TYPE 814 AcpiDsMethodDataGetType ( 815 UINT16 Opcode, 816 UINT32 Index, 817 ACPI_WALK_STATE *WalkState) 818 { 819 ACPI_STATUS Status; 820 ACPI_NAMESPACE_NODE *Node; 821 ACPI_OPERAND_OBJECT *Object; 822 823 824 ACPI_FUNCTION_TRACE (DsMethodDataGetType); 825 826 827 /* Get the namespace node for the arg/local */ 828 829 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node); 830 if (ACPI_FAILURE (Status)) 831 { 832 return_VALUE ((ACPI_TYPE_NOT_FOUND)); 833 } 834 835 /* Get the object */ 836 837 Object = AcpiNsGetAttachedObject (Node); 838 if (!Object) 839 { 840 /* Uninitialized local/arg, return TYPE_ANY */ 841 842 return_VALUE (ACPI_TYPE_ANY); 843 } 844 845 /* Get the object type */ 846 847 return_VALUE (Object->Type); 848 } 849 #endif 850