1 /****************************************************************************** 2 * 3 * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2012, 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 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 __EXMISC_C__ 118 119 #include "acpi.h" 120 #include "accommon.h" 121 #include "acinterp.h" 122 #include "amlcode.h" 123 #include "amlresrc.h" 124 125 126 #define _COMPONENT ACPI_EXECUTER 127 ACPI_MODULE_NAME ("exmisc") 128 129 130 /******************************************************************************* 131 * 132 * FUNCTION: AcpiExGetObjectReference 133 * 134 * PARAMETERS: ObjDesc - Create a reference to this object 135 * ReturnDesc - Where to store the reference 136 * WalkState - Current state 137 * 138 * RETURN: Status 139 * 140 * DESCRIPTION: Obtain and return a "reference" to the target object 141 * Common code for the RefOfOp and the CondRefOfOp. 142 * 143 ******************************************************************************/ 144 145 ACPI_STATUS 146 AcpiExGetObjectReference ( 147 ACPI_OPERAND_OBJECT *ObjDesc, 148 ACPI_OPERAND_OBJECT **ReturnDesc, 149 ACPI_WALK_STATE *WalkState) 150 { 151 ACPI_OPERAND_OBJECT *ReferenceObj; 152 ACPI_OPERAND_OBJECT *ReferencedObj; 153 154 155 ACPI_FUNCTION_TRACE_PTR (ExGetObjectReference, ObjDesc); 156 157 158 *ReturnDesc = NULL; 159 160 switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc)) 161 { 162 case ACPI_DESC_TYPE_OPERAND: 163 164 if (ObjDesc->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) 165 { 166 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 167 } 168 169 /* 170 * Must be a reference to a Local or Arg 171 */ 172 switch (ObjDesc->Reference.Class) 173 { 174 case ACPI_REFCLASS_LOCAL: 175 case ACPI_REFCLASS_ARG: 176 case ACPI_REFCLASS_DEBUG: 177 178 /* The referenced object is the pseudo-node for the local/arg */ 179 180 ReferencedObj = ObjDesc->Reference.Object; 181 break; 182 183 default: 184 185 ACPI_ERROR ((AE_INFO, "Unknown Reference Class 0x%2.2X", 186 ObjDesc->Reference.Class)); 187 return_ACPI_STATUS (AE_AML_INTERNAL); 188 } 189 break; 190 191 192 case ACPI_DESC_TYPE_NAMED: 193 194 /* 195 * A named reference that has already been resolved to a Node 196 */ 197 ReferencedObj = ObjDesc; 198 break; 199 200 201 default: 202 203 ACPI_ERROR ((AE_INFO, "Invalid descriptor type 0x%X", 204 ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))); 205 return_ACPI_STATUS (AE_TYPE); 206 } 207 208 209 /* Create a new reference object */ 210 211 ReferenceObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE); 212 if (!ReferenceObj) 213 { 214 return_ACPI_STATUS (AE_NO_MEMORY); 215 } 216 217 ReferenceObj->Reference.Class = ACPI_REFCLASS_REFOF; 218 ReferenceObj->Reference.Object = ReferencedObj; 219 *ReturnDesc = ReferenceObj; 220 221 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 222 "Object %p Type [%s], returning Reference %p\n", 223 ObjDesc, AcpiUtGetObjectTypeName (ObjDesc), *ReturnDesc)); 224 225 return_ACPI_STATUS (AE_OK); 226 } 227 228 229 /******************************************************************************* 230 * 231 * FUNCTION: AcpiExConcatTemplate 232 * 233 * PARAMETERS: Operand0 - First source object 234 * Operand1 - Second source object 235 * ActualReturnDesc - Where to place the return object 236 * WalkState - Current walk state 237 * 238 * RETURN: Status 239 * 240 * DESCRIPTION: Concatenate two resource templates 241 * 242 ******************************************************************************/ 243 244 ACPI_STATUS 245 AcpiExConcatTemplate ( 246 ACPI_OPERAND_OBJECT *Operand0, 247 ACPI_OPERAND_OBJECT *Operand1, 248 ACPI_OPERAND_OBJECT **ActualReturnDesc, 249 ACPI_WALK_STATE *WalkState) 250 { 251 ACPI_STATUS Status; 252 ACPI_OPERAND_OBJECT *ReturnDesc; 253 UINT8 *NewBuf; 254 UINT8 *EndTag; 255 ACPI_SIZE Length0; 256 ACPI_SIZE Length1; 257 ACPI_SIZE NewLength; 258 259 260 ACPI_FUNCTION_TRACE (ExConcatTemplate); 261 262 263 /* 264 * Find the EndTag descriptor in each resource template. 265 * Note1: returned pointers point TO the EndTag, not past it. 266 * Note2: zero-length buffers are allowed; treated like one EndTag 267 */ 268 269 /* Get the length of the first resource template */ 270 271 Status = AcpiUtGetResourceEndTag (Operand0, &EndTag); 272 if (ACPI_FAILURE (Status)) 273 { 274 return_ACPI_STATUS (Status); 275 } 276 277 Length0 = ACPI_PTR_DIFF (EndTag, Operand0->Buffer.Pointer); 278 279 /* Get the length of the second resource template */ 280 281 Status = AcpiUtGetResourceEndTag (Operand1, &EndTag); 282 if (ACPI_FAILURE (Status)) 283 { 284 return_ACPI_STATUS (Status); 285 } 286 287 Length1 = ACPI_PTR_DIFF (EndTag, Operand1->Buffer.Pointer); 288 289 /* Combine both lengths, minimum size will be 2 for EndTag */ 290 291 NewLength = Length0 + Length1 + sizeof (AML_RESOURCE_END_TAG); 292 293 /* Create a new buffer object for the result (with one EndTag) */ 294 295 ReturnDesc = AcpiUtCreateBufferObject (NewLength); 296 if (!ReturnDesc) 297 { 298 return_ACPI_STATUS (AE_NO_MEMORY); 299 } 300 301 /* 302 * Copy the templates to the new buffer, 0 first, then 1 follows. One 303 * EndTag descriptor is copied from Operand1. 304 */ 305 NewBuf = ReturnDesc->Buffer.Pointer; 306 ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer, Length0); 307 ACPI_MEMCPY (NewBuf + Length0, Operand1->Buffer.Pointer, Length1); 308 309 /* Insert EndTag and set the checksum to zero, means "ignore checksum" */ 310 311 NewBuf[NewLength - 1] = 0; 312 NewBuf[NewLength - 2] = ACPI_RESOURCE_NAME_END_TAG | 1; 313 314 /* Return the completed resource template */ 315 316 *ActualReturnDesc = ReturnDesc; 317 return_ACPI_STATUS (AE_OK); 318 } 319 320 321 /******************************************************************************* 322 * 323 * FUNCTION: AcpiExDoConcatenate 324 * 325 * PARAMETERS: Operand0 - First source object 326 * Operand1 - Second source object 327 * ActualReturnDesc - Where to place the return object 328 * WalkState - Current walk state 329 * 330 * RETURN: Status 331 * 332 * DESCRIPTION: Concatenate two objects OF THE SAME TYPE. 333 * 334 ******************************************************************************/ 335 336 ACPI_STATUS 337 AcpiExDoConcatenate ( 338 ACPI_OPERAND_OBJECT *Operand0, 339 ACPI_OPERAND_OBJECT *Operand1, 340 ACPI_OPERAND_OBJECT **ActualReturnDesc, 341 ACPI_WALK_STATE *WalkState) 342 { 343 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; 344 ACPI_OPERAND_OBJECT *ReturnDesc; 345 char *NewBuf; 346 ACPI_STATUS Status; 347 348 349 ACPI_FUNCTION_TRACE (ExDoConcatenate); 350 351 352 /* 353 * Convert the second operand if necessary. The first operand 354 * determines the type of the second operand, (See the Data Types 355 * section of the ACPI specification.) Both object types are 356 * guaranteed to be either Integer/String/Buffer by the operand 357 * resolution mechanism. 358 */ 359 switch (Operand0->Common.Type) 360 { 361 case ACPI_TYPE_INTEGER: 362 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); 363 break; 364 365 case ACPI_TYPE_STRING: 366 Status = AcpiExConvertToString (Operand1, &LocalOperand1, 367 ACPI_IMPLICIT_CONVERT_HEX); 368 break; 369 370 case ACPI_TYPE_BUFFER: 371 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); 372 break; 373 374 default: 375 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X", 376 Operand0->Common.Type)); 377 Status = AE_AML_INTERNAL; 378 } 379 380 if (ACPI_FAILURE (Status)) 381 { 382 goto Cleanup; 383 } 384 385 /* 386 * Both operands are now known to be the same object type 387 * (Both are Integer, String, or Buffer), and we can now perform the 388 * concatenation. 389 */ 390 391 /* 392 * There are three cases to handle: 393 * 394 * 1) Two Integers concatenated to produce a new Buffer 395 * 2) Two Strings concatenated to produce a new String 396 * 3) Two Buffers concatenated to produce a new Buffer 397 */ 398 switch (Operand0->Common.Type) 399 { 400 case ACPI_TYPE_INTEGER: 401 402 /* Result of two Integers is a Buffer */ 403 /* Need enough buffer space for two integers */ 404 405 ReturnDesc = AcpiUtCreateBufferObject ((ACPI_SIZE) 406 ACPI_MUL_2 (AcpiGbl_IntegerByteWidth)); 407 if (!ReturnDesc) 408 { 409 Status = AE_NO_MEMORY; 410 goto Cleanup; 411 } 412 413 NewBuf = (char *) ReturnDesc->Buffer.Pointer; 414 415 /* Copy the first integer, LSB first */ 416 417 ACPI_MEMCPY (NewBuf, &Operand0->Integer.Value, 418 AcpiGbl_IntegerByteWidth); 419 420 /* Copy the second integer (LSB first) after the first */ 421 422 ACPI_MEMCPY (NewBuf + AcpiGbl_IntegerByteWidth, 423 &LocalOperand1->Integer.Value, 424 AcpiGbl_IntegerByteWidth); 425 break; 426 427 case ACPI_TYPE_STRING: 428 429 /* Result of two Strings is a String */ 430 431 ReturnDesc = AcpiUtCreateStringObject ( 432 ((ACPI_SIZE) Operand0->String.Length + 433 LocalOperand1->String.Length)); 434 if (!ReturnDesc) 435 { 436 Status = AE_NO_MEMORY; 437 goto Cleanup; 438 } 439 440 NewBuf = ReturnDesc->String.Pointer; 441 442 /* Concatenate the strings */ 443 444 ACPI_STRCPY (NewBuf, Operand0->String.Pointer); 445 ACPI_STRCPY (NewBuf + Operand0->String.Length, 446 LocalOperand1->String.Pointer); 447 break; 448 449 case ACPI_TYPE_BUFFER: 450 451 /* Result of two Buffers is a Buffer */ 452 453 ReturnDesc = AcpiUtCreateBufferObject ( 454 ((ACPI_SIZE) Operand0->Buffer.Length + 455 LocalOperand1->Buffer.Length)); 456 if (!ReturnDesc) 457 { 458 Status = AE_NO_MEMORY; 459 goto Cleanup; 460 } 461 462 NewBuf = (char *) ReturnDesc->Buffer.Pointer; 463 464 /* Concatenate the buffers */ 465 466 ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer, 467 Operand0->Buffer.Length); 468 ACPI_MEMCPY (NewBuf + Operand0->Buffer.Length, 469 LocalOperand1->Buffer.Pointer, 470 LocalOperand1->Buffer.Length); 471 break; 472 473 default: 474 475 /* Invalid object type, should not happen here */ 476 477 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X", 478 Operand0->Common.Type)); 479 Status =AE_AML_INTERNAL; 480 goto Cleanup; 481 } 482 483 *ActualReturnDesc = ReturnDesc; 484 485 Cleanup: 486 if (LocalOperand1 != Operand1) 487 { 488 AcpiUtRemoveReference (LocalOperand1); 489 } 490 return_ACPI_STATUS (Status); 491 } 492 493 494 /******************************************************************************* 495 * 496 * FUNCTION: AcpiExDoMathOp 497 * 498 * PARAMETERS: Opcode - AML opcode 499 * Integer0 - Integer operand #0 500 * Integer1 - Integer operand #1 501 * 502 * RETURN: Integer result of the operation 503 * 504 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the 505 * math functions here is to prevent a lot of pointer dereferencing 506 * to obtain the operands. 507 * 508 ******************************************************************************/ 509 510 UINT64 511 AcpiExDoMathOp ( 512 UINT16 Opcode, 513 UINT64 Integer0, 514 UINT64 Integer1) 515 { 516 517 ACPI_FUNCTION_ENTRY (); 518 519 520 switch (Opcode) 521 { 522 case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */ 523 524 return (Integer0 + Integer1); 525 526 527 case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */ 528 529 return (Integer0 & Integer1); 530 531 532 case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */ 533 534 return (~(Integer0 & Integer1)); 535 536 537 case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */ 538 539 return (Integer0 | Integer1); 540 541 542 case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */ 543 544 return (~(Integer0 | Integer1)); 545 546 547 case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */ 548 549 return (Integer0 ^ Integer1); 550 551 552 case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */ 553 554 return (Integer0 * Integer1); 555 556 557 case AML_SHIFT_LEFT_OP: /* ShiftLeft (Operand, ShiftCount, Result)*/ 558 559 /* 560 * We need to check if the shiftcount is larger than the integer bit 561 * width since the behavior of this is not well-defined in the C language. 562 */ 563 if (Integer1 >= AcpiGbl_IntegerBitWidth) 564 { 565 return (0); 566 } 567 return (Integer0 << Integer1); 568 569 570 case AML_SHIFT_RIGHT_OP: /* ShiftRight (Operand, ShiftCount, Result) */ 571 572 /* 573 * We need to check if the shiftcount is larger than the integer bit 574 * width since the behavior of this is not well-defined in the C language. 575 */ 576 if (Integer1 >= AcpiGbl_IntegerBitWidth) 577 { 578 return (0); 579 } 580 return (Integer0 >> Integer1); 581 582 583 case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */ 584 585 return (Integer0 - Integer1); 586 587 default: 588 589 return (0); 590 } 591 } 592 593 594 /******************************************************************************* 595 * 596 * FUNCTION: AcpiExDoLogicalNumericOp 597 * 598 * PARAMETERS: Opcode - AML opcode 599 * Integer0 - Integer operand #0 600 * Integer1 - Integer operand #1 601 * LogicalResult - TRUE/FALSE result of the operation 602 * 603 * RETURN: Status 604 * 605 * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric 606 * operators (LAnd and LOr), both operands must be integers. 607 * 608 * Note: cleanest machine code seems to be produced by the code 609 * below, rather than using statements of the form: 610 * Result = (Integer0 && Integer1); 611 * 612 ******************************************************************************/ 613 614 ACPI_STATUS 615 AcpiExDoLogicalNumericOp ( 616 UINT16 Opcode, 617 UINT64 Integer0, 618 UINT64 Integer1, 619 BOOLEAN *LogicalResult) 620 { 621 ACPI_STATUS Status = AE_OK; 622 BOOLEAN LocalResult = FALSE; 623 624 625 ACPI_FUNCTION_TRACE (ExDoLogicalNumericOp); 626 627 628 switch (Opcode) 629 { 630 case AML_LAND_OP: /* LAnd (Integer0, Integer1) */ 631 632 if (Integer0 && Integer1) 633 { 634 LocalResult = TRUE; 635 } 636 break; 637 638 case AML_LOR_OP: /* LOr (Integer0, Integer1) */ 639 640 if (Integer0 || Integer1) 641 { 642 LocalResult = TRUE; 643 } 644 break; 645 646 default: 647 Status = AE_AML_INTERNAL; 648 break; 649 } 650 651 /* Return the logical result and status */ 652 653 *LogicalResult = LocalResult; 654 return_ACPI_STATUS (Status); 655 } 656 657 658 /******************************************************************************* 659 * 660 * FUNCTION: AcpiExDoLogicalOp 661 * 662 * PARAMETERS: Opcode - AML opcode 663 * Operand0 - operand #0 664 * Operand1 - operand #1 665 * LogicalResult - TRUE/FALSE result of the operation 666 * 667 * RETURN: Status 668 * 669 * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the 670 * functions here is to prevent a lot of pointer dereferencing 671 * to obtain the operands and to simplify the generation of the 672 * logical value. For the Numeric operators (LAnd and LOr), both 673 * operands must be integers. For the other logical operators, 674 * operands can be any combination of Integer/String/Buffer. The 675 * first operand determines the type to which the second operand 676 * will be converted. 677 * 678 * Note: cleanest machine code seems to be produced by the code 679 * below, rather than using statements of the form: 680 * Result = (Operand0 == Operand1); 681 * 682 ******************************************************************************/ 683 684 ACPI_STATUS 685 AcpiExDoLogicalOp ( 686 UINT16 Opcode, 687 ACPI_OPERAND_OBJECT *Operand0, 688 ACPI_OPERAND_OBJECT *Operand1, 689 BOOLEAN *LogicalResult) 690 { 691 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; 692 UINT64 Integer0; 693 UINT64 Integer1; 694 UINT32 Length0; 695 UINT32 Length1; 696 ACPI_STATUS Status = AE_OK; 697 BOOLEAN LocalResult = FALSE; 698 int Compare; 699 700 701 ACPI_FUNCTION_TRACE (ExDoLogicalOp); 702 703 704 /* 705 * Convert the second operand if necessary. The first operand 706 * determines the type of the second operand, (See the Data Types 707 * section of the ACPI 3.0+ specification.) Both object types are 708 * guaranteed to be either Integer/String/Buffer by the operand 709 * resolution mechanism. 710 */ 711 switch (Operand0->Common.Type) 712 { 713 case ACPI_TYPE_INTEGER: 714 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); 715 break; 716 717 case ACPI_TYPE_STRING: 718 Status = AcpiExConvertToString (Operand1, &LocalOperand1, 719 ACPI_IMPLICIT_CONVERT_HEX); 720 break; 721 722 case ACPI_TYPE_BUFFER: 723 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); 724 break; 725 726 default: 727 Status = AE_AML_INTERNAL; 728 break; 729 } 730 731 if (ACPI_FAILURE (Status)) 732 { 733 goto Cleanup; 734 } 735 736 /* 737 * Two cases: 1) Both Integers, 2) Both Strings or Buffers 738 */ 739 if (Operand0->Common.Type == ACPI_TYPE_INTEGER) 740 { 741 /* 742 * 1) Both operands are of type integer 743 * Note: LocalOperand1 may have changed above 744 */ 745 Integer0 = Operand0->Integer.Value; 746 Integer1 = LocalOperand1->Integer.Value; 747 748 switch (Opcode) 749 { 750 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 751 752 if (Integer0 == Integer1) 753 { 754 LocalResult = TRUE; 755 } 756 break; 757 758 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 759 760 if (Integer0 > Integer1) 761 { 762 LocalResult = TRUE; 763 } 764 break; 765 766 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 767 768 if (Integer0 < Integer1) 769 { 770 LocalResult = TRUE; 771 } 772 break; 773 774 default: 775 Status = AE_AML_INTERNAL; 776 break; 777 } 778 } 779 else 780 { 781 /* 782 * 2) Both operands are Strings or both are Buffers 783 * Note: Code below takes advantage of common Buffer/String 784 * object fields. LocalOperand1 may have changed above. Use 785 * memcmp to handle nulls in buffers. 786 */ 787 Length0 = Operand0->Buffer.Length; 788 Length1 = LocalOperand1->Buffer.Length; 789 790 /* Lexicographic compare: compare the data bytes */ 791 792 Compare = ACPI_MEMCMP (Operand0->Buffer.Pointer, 793 LocalOperand1->Buffer.Pointer, 794 (Length0 > Length1) ? Length1 : Length0); 795 796 switch (Opcode) 797 { 798 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 799 800 /* Length and all bytes must be equal */ 801 802 if ((Length0 == Length1) && 803 (Compare == 0)) 804 { 805 /* Length and all bytes match ==> TRUE */ 806 807 LocalResult = TRUE; 808 } 809 break; 810 811 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 812 813 if (Compare > 0) 814 { 815 LocalResult = TRUE; 816 goto Cleanup; /* TRUE */ 817 } 818 if (Compare < 0) 819 { 820 goto Cleanup; /* FALSE */ 821 } 822 823 /* Bytes match (to shortest length), compare lengths */ 824 825 if (Length0 > Length1) 826 { 827 LocalResult = TRUE; 828 } 829 break; 830 831 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 832 833 if (Compare > 0) 834 { 835 goto Cleanup; /* FALSE */ 836 } 837 if (Compare < 0) 838 { 839 LocalResult = TRUE; 840 goto Cleanup; /* TRUE */ 841 } 842 843 /* Bytes match (to shortest length), compare lengths */ 844 845 if (Length0 < Length1) 846 { 847 LocalResult = TRUE; 848 } 849 break; 850 851 default: 852 Status = AE_AML_INTERNAL; 853 break; 854 } 855 } 856 857 Cleanup: 858 859 /* New object was created if implicit conversion performed - delete */ 860 861 if (LocalOperand1 != Operand1) 862 { 863 AcpiUtRemoveReference (LocalOperand1); 864 } 865 866 /* Return the logical result and status */ 867 868 *LogicalResult = LocalResult; 869 return_ACPI_STATUS (Status); 870 } 871