1 2 /****************************************************************************** 3 * 4 * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes 5 * 6 *****************************************************************************/ 7 8 /* 9 * Copyright (C) 2000 - 2011, Intel Corp. 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer, 17 * without modification. 18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 19 * substantially similar to the "NO WARRANTY" disclaimer below 20 * ("Disclaimer") and any redistribution must be conditioned upon 21 * including a substantially similar Disclaimer requirement for further 22 * binary redistribution. 23 * 3. Neither the names of the above-listed copyright holders nor the names 24 * of any contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * Alternatively, this software may be distributed under the terms of the 28 * GNU General Public License ("GPL") version 2 as published by the Free 29 * Software Foundation. 30 * 31 * NO WARRANTY 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 42 * POSSIBILITY OF SUCH DAMAGES. 43 */ 44 45 #define __EXMISC_C__ 46 47 #include "acpi.h" 48 #include "accommon.h" 49 #include "acinterp.h" 50 #include "amlcode.h" 51 #include "amlresrc.h" 52 53 54 #define _COMPONENT ACPI_EXECUTER 55 ACPI_MODULE_NAME ("exmisc") 56 57 58 /******************************************************************************* 59 * 60 * FUNCTION: AcpiExGetObjectReference 61 * 62 * PARAMETERS: ObjDesc - Create a reference to this object 63 * ReturnDesc - Where to store the reference 64 * WalkState - Current state 65 * 66 * RETURN: Status 67 * 68 * DESCRIPTION: Obtain and return a "reference" to the target object 69 * Common code for the RefOfOp and the CondRefOfOp. 70 * 71 ******************************************************************************/ 72 73 ACPI_STATUS 74 AcpiExGetObjectReference ( 75 ACPI_OPERAND_OBJECT *ObjDesc, 76 ACPI_OPERAND_OBJECT **ReturnDesc, 77 ACPI_WALK_STATE *WalkState) 78 { 79 ACPI_OPERAND_OBJECT *ReferenceObj; 80 ACPI_OPERAND_OBJECT *ReferencedObj; 81 82 83 ACPI_FUNCTION_TRACE_PTR (ExGetObjectReference, ObjDesc); 84 85 86 *ReturnDesc = NULL; 87 88 switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc)) 89 { 90 case ACPI_DESC_TYPE_OPERAND: 91 92 if (ObjDesc->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) 93 { 94 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 95 } 96 97 /* 98 * Must be a reference to a Local or Arg 99 */ 100 switch (ObjDesc->Reference.Class) 101 { 102 case ACPI_REFCLASS_LOCAL: 103 case ACPI_REFCLASS_ARG: 104 case ACPI_REFCLASS_DEBUG: 105 106 /* The referenced object is the pseudo-node for the local/arg */ 107 108 ReferencedObj = ObjDesc->Reference.Object; 109 break; 110 111 default: 112 113 ACPI_ERROR ((AE_INFO, "Unknown Reference Class 0x%2.2X", 114 ObjDesc->Reference.Class)); 115 return_ACPI_STATUS (AE_AML_INTERNAL); 116 } 117 break; 118 119 120 case ACPI_DESC_TYPE_NAMED: 121 122 /* 123 * A named reference that has already been resolved to a Node 124 */ 125 ReferencedObj = ObjDesc; 126 break; 127 128 129 default: 130 131 ACPI_ERROR ((AE_INFO, "Invalid descriptor type 0x%X", 132 ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))); 133 return_ACPI_STATUS (AE_TYPE); 134 } 135 136 137 /* Create a new reference object */ 138 139 ReferenceObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE); 140 if (!ReferenceObj) 141 { 142 return_ACPI_STATUS (AE_NO_MEMORY); 143 } 144 145 ReferenceObj->Reference.Class = ACPI_REFCLASS_REFOF; 146 ReferenceObj->Reference.Object = ReferencedObj; 147 *ReturnDesc = ReferenceObj; 148 149 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 150 "Object %p Type [%s], returning Reference %p\n", 151 ObjDesc, AcpiUtGetObjectTypeName (ObjDesc), *ReturnDesc)); 152 153 return_ACPI_STATUS (AE_OK); 154 } 155 156 157 /******************************************************************************* 158 * 159 * FUNCTION: AcpiExConcatTemplate 160 * 161 * PARAMETERS: Operand0 - First source object 162 * Operand1 - Second source object 163 * ActualReturnDesc - Where to place the return object 164 * WalkState - Current walk state 165 * 166 * RETURN: Status 167 * 168 * DESCRIPTION: Concatenate two resource templates 169 * 170 ******************************************************************************/ 171 172 ACPI_STATUS 173 AcpiExConcatTemplate ( 174 ACPI_OPERAND_OBJECT *Operand0, 175 ACPI_OPERAND_OBJECT *Operand1, 176 ACPI_OPERAND_OBJECT **ActualReturnDesc, 177 ACPI_WALK_STATE *WalkState) 178 { 179 ACPI_STATUS Status; 180 ACPI_OPERAND_OBJECT *ReturnDesc; 181 UINT8 *NewBuf; 182 UINT8 *EndTag; 183 ACPI_SIZE Length0; 184 ACPI_SIZE Length1; 185 ACPI_SIZE NewLength; 186 187 188 ACPI_FUNCTION_TRACE (ExConcatTemplate); 189 190 191 /* 192 * Find the EndTag descriptor in each resource template. 193 * Note1: returned pointers point TO the EndTag, not past it. 194 * Note2: zero-length buffers are allowed; treated like one EndTag 195 */ 196 197 /* Get the length of the first resource template */ 198 199 Status = AcpiUtGetResourceEndTag (Operand0, &EndTag); 200 if (ACPI_FAILURE (Status)) 201 { 202 return_ACPI_STATUS (Status); 203 } 204 205 Length0 = ACPI_PTR_DIFF (EndTag, Operand0->Buffer.Pointer); 206 207 /* Get the length of the second resource template */ 208 209 Status = AcpiUtGetResourceEndTag (Operand1, &EndTag); 210 if (ACPI_FAILURE (Status)) 211 { 212 return_ACPI_STATUS (Status); 213 } 214 215 Length1 = ACPI_PTR_DIFF (EndTag, Operand1->Buffer.Pointer); 216 217 /* Combine both lengths, minimum size will be 2 for EndTag */ 218 219 NewLength = Length0 + Length1 + sizeof (AML_RESOURCE_END_TAG); 220 221 /* Create a new buffer object for the result (with one EndTag) */ 222 223 ReturnDesc = AcpiUtCreateBufferObject (NewLength); 224 if (!ReturnDesc) 225 { 226 return_ACPI_STATUS (AE_NO_MEMORY); 227 } 228 229 /* 230 * Copy the templates to the new buffer, 0 first, then 1 follows. One 231 * EndTag descriptor is copied from Operand1. 232 */ 233 NewBuf = ReturnDesc->Buffer.Pointer; 234 ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer, Length0); 235 ACPI_MEMCPY (NewBuf + Length0, Operand1->Buffer.Pointer, Length1); 236 237 /* Insert EndTag and set the checksum to zero, means "ignore checksum" */ 238 239 NewBuf[NewLength - 1] = 0; 240 NewBuf[NewLength - 2] = ACPI_RESOURCE_NAME_END_TAG | 1; 241 242 /* Return the completed resource template */ 243 244 *ActualReturnDesc = ReturnDesc; 245 return_ACPI_STATUS (AE_OK); 246 } 247 248 249 /******************************************************************************* 250 * 251 * FUNCTION: AcpiExDoConcatenate 252 * 253 * PARAMETERS: Operand0 - First source object 254 * Operand1 - Second source object 255 * ActualReturnDesc - Where to place the return object 256 * WalkState - Current walk state 257 * 258 * RETURN: Status 259 * 260 * DESCRIPTION: Concatenate two objects OF THE SAME TYPE. 261 * 262 ******************************************************************************/ 263 264 ACPI_STATUS 265 AcpiExDoConcatenate ( 266 ACPI_OPERAND_OBJECT *Operand0, 267 ACPI_OPERAND_OBJECT *Operand1, 268 ACPI_OPERAND_OBJECT **ActualReturnDesc, 269 ACPI_WALK_STATE *WalkState) 270 { 271 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; 272 ACPI_OPERAND_OBJECT *ReturnDesc; 273 char *NewBuf; 274 ACPI_STATUS Status; 275 276 277 ACPI_FUNCTION_TRACE (ExDoConcatenate); 278 279 280 /* 281 * Convert the second operand if necessary. The first operand 282 * determines the type of the second operand, (See the Data Types 283 * section of the ACPI specification.) Both object types are 284 * guaranteed to be either Integer/String/Buffer by the operand 285 * resolution mechanism. 286 */ 287 switch (Operand0->Common.Type) 288 { 289 case ACPI_TYPE_INTEGER: 290 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); 291 break; 292 293 case ACPI_TYPE_STRING: 294 Status = AcpiExConvertToString (Operand1, &LocalOperand1, 295 ACPI_IMPLICIT_CONVERT_HEX); 296 break; 297 298 case ACPI_TYPE_BUFFER: 299 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); 300 break; 301 302 default: 303 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X", 304 Operand0->Common.Type)); 305 Status = AE_AML_INTERNAL; 306 } 307 308 if (ACPI_FAILURE (Status)) 309 { 310 goto Cleanup; 311 } 312 313 /* 314 * Both operands are now known to be the same object type 315 * (Both are Integer, String, or Buffer), and we can now perform the 316 * concatenation. 317 */ 318 319 /* 320 * There are three cases to handle: 321 * 322 * 1) Two Integers concatenated to produce a new Buffer 323 * 2) Two Strings concatenated to produce a new String 324 * 3) Two Buffers concatenated to produce a new Buffer 325 */ 326 switch (Operand0->Common.Type) 327 { 328 case ACPI_TYPE_INTEGER: 329 330 /* Result of two Integers is a Buffer */ 331 /* Need enough buffer space for two integers */ 332 333 ReturnDesc = AcpiUtCreateBufferObject ((ACPI_SIZE) 334 ACPI_MUL_2 (AcpiGbl_IntegerByteWidth)); 335 if (!ReturnDesc) 336 { 337 Status = AE_NO_MEMORY; 338 goto Cleanup; 339 } 340 341 NewBuf = (char *) ReturnDesc->Buffer.Pointer; 342 343 /* Copy the first integer, LSB first */ 344 345 ACPI_MEMCPY (NewBuf, &Operand0->Integer.Value, 346 AcpiGbl_IntegerByteWidth); 347 348 /* Copy the second integer (LSB first) after the first */ 349 350 ACPI_MEMCPY (NewBuf + AcpiGbl_IntegerByteWidth, 351 &LocalOperand1->Integer.Value, 352 AcpiGbl_IntegerByteWidth); 353 break; 354 355 case ACPI_TYPE_STRING: 356 357 /* Result of two Strings is a String */ 358 359 ReturnDesc = AcpiUtCreateStringObject ( 360 ((ACPI_SIZE) Operand0->String.Length + 361 LocalOperand1->String.Length)); 362 if (!ReturnDesc) 363 { 364 Status = AE_NO_MEMORY; 365 goto Cleanup; 366 } 367 368 NewBuf = ReturnDesc->String.Pointer; 369 370 /* Concatenate the strings */ 371 372 ACPI_STRCPY (NewBuf, Operand0->String.Pointer); 373 ACPI_STRCPY (NewBuf + Operand0->String.Length, 374 LocalOperand1->String.Pointer); 375 break; 376 377 case ACPI_TYPE_BUFFER: 378 379 /* Result of two Buffers is a Buffer */ 380 381 ReturnDesc = AcpiUtCreateBufferObject ( 382 ((ACPI_SIZE) Operand0->Buffer.Length + 383 LocalOperand1->Buffer.Length)); 384 if (!ReturnDesc) 385 { 386 Status = AE_NO_MEMORY; 387 goto Cleanup; 388 } 389 390 NewBuf = (char *) ReturnDesc->Buffer.Pointer; 391 392 /* Concatenate the buffers */ 393 394 ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer, 395 Operand0->Buffer.Length); 396 ACPI_MEMCPY (NewBuf + Operand0->Buffer.Length, 397 LocalOperand1->Buffer.Pointer, 398 LocalOperand1->Buffer.Length); 399 break; 400 401 default: 402 403 /* Invalid object type, should not happen here */ 404 405 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X", 406 Operand0->Common.Type)); 407 Status =AE_AML_INTERNAL; 408 goto Cleanup; 409 } 410 411 *ActualReturnDesc = ReturnDesc; 412 413 Cleanup: 414 if (LocalOperand1 != Operand1) 415 { 416 AcpiUtRemoveReference (LocalOperand1); 417 } 418 return_ACPI_STATUS (Status); 419 } 420 421 422 /******************************************************************************* 423 * 424 * FUNCTION: AcpiExDoMathOp 425 * 426 * PARAMETERS: Opcode - AML opcode 427 * Integer0 - Integer operand #0 428 * Integer1 - Integer operand #1 429 * 430 * RETURN: Integer result of the operation 431 * 432 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the 433 * math functions here is to prevent a lot of pointer dereferencing 434 * to obtain the operands. 435 * 436 ******************************************************************************/ 437 438 UINT64 439 AcpiExDoMathOp ( 440 UINT16 Opcode, 441 UINT64 Integer0, 442 UINT64 Integer1) 443 { 444 445 ACPI_FUNCTION_ENTRY (); 446 447 448 switch (Opcode) 449 { 450 case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */ 451 452 return (Integer0 + Integer1); 453 454 455 case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */ 456 457 return (Integer0 & Integer1); 458 459 460 case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */ 461 462 return (~(Integer0 & Integer1)); 463 464 465 case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */ 466 467 return (Integer0 | Integer1); 468 469 470 case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */ 471 472 return (~(Integer0 | Integer1)); 473 474 475 case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */ 476 477 return (Integer0 ^ Integer1); 478 479 480 case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */ 481 482 return (Integer0 * Integer1); 483 484 485 case AML_SHIFT_LEFT_OP: /* ShiftLeft (Operand, ShiftCount, Result)*/ 486 487 /* 488 * We need to check if the shiftcount is larger than the integer bit 489 * width since the behavior of this is not well-defined in the C language. 490 */ 491 if (Integer1 >= AcpiGbl_IntegerBitWidth) 492 { 493 return (0); 494 } 495 return (Integer0 << Integer1); 496 497 498 case AML_SHIFT_RIGHT_OP: /* ShiftRight (Operand, ShiftCount, Result) */ 499 500 /* 501 * We need to check if the shiftcount is larger than the integer bit 502 * width since the behavior of this is not well-defined in the C language. 503 */ 504 if (Integer1 >= AcpiGbl_IntegerBitWidth) 505 { 506 return (0); 507 } 508 return (Integer0 >> Integer1); 509 510 511 case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */ 512 513 return (Integer0 - Integer1); 514 515 default: 516 517 return (0); 518 } 519 } 520 521 522 /******************************************************************************* 523 * 524 * FUNCTION: AcpiExDoLogicalNumericOp 525 * 526 * PARAMETERS: Opcode - AML opcode 527 * Integer0 - Integer operand #0 528 * Integer1 - Integer operand #1 529 * LogicalResult - TRUE/FALSE result of the operation 530 * 531 * RETURN: Status 532 * 533 * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric 534 * operators (LAnd and LOr), both operands must be integers. 535 * 536 * Note: cleanest machine code seems to be produced by the code 537 * below, rather than using statements of the form: 538 * Result = (Integer0 && Integer1); 539 * 540 ******************************************************************************/ 541 542 ACPI_STATUS 543 AcpiExDoLogicalNumericOp ( 544 UINT16 Opcode, 545 UINT64 Integer0, 546 UINT64 Integer1, 547 BOOLEAN *LogicalResult) 548 { 549 ACPI_STATUS Status = AE_OK; 550 BOOLEAN LocalResult = FALSE; 551 552 553 ACPI_FUNCTION_TRACE (ExDoLogicalNumericOp); 554 555 556 switch (Opcode) 557 { 558 case AML_LAND_OP: /* LAnd (Integer0, Integer1) */ 559 560 if (Integer0 && Integer1) 561 { 562 LocalResult = TRUE; 563 } 564 break; 565 566 case AML_LOR_OP: /* LOr (Integer0, Integer1) */ 567 568 if (Integer0 || Integer1) 569 { 570 LocalResult = TRUE; 571 } 572 break; 573 574 default: 575 Status = AE_AML_INTERNAL; 576 break; 577 } 578 579 /* Return the logical result and status */ 580 581 *LogicalResult = LocalResult; 582 return_ACPI_STATUS (Status); 583 } 584 585 586 /******************************************************************************* 587 * 588 * FUNCTION: AcpiExDoLogicalOp 589 * 590 * PARAMETERS: Opcode - AML opcode 591 * Operand0 - operand #0 592 * Operand1 - operand #1 593 * LogicalResult - TRUE/FALSE result of the operation 594 * 595 * RETURN: Status 596 * 597 * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the 598 * functions here is to prevent a lot of pointer dereferencing 599 * to obtain the operands and to simplify the generation of the 600 * logical value. For the Numeric operators (LAnd and LOr), both 601 * operands must be integers. For the other logical operators, 602 * operands can be any combination of Integer/String/Buffer. The 603 * first operand determines the type to which the second operand 604 * will be converted. 605 * 606 * Note: cleanest machine code seems to be produced by the code 607 * below, rather than using statements of the form: 608 * Result = (Operand0 == Operand1); 609 * 610 ******************************************************************************/ 611 612 ACPI_STATUS 613 AcpiExDoLogicalOp ( 614 UINT16 Opcode, 615 ACPI_OPERAND_OBJECT *Operand0, 616 ACPI_OPERAND_OBJECT *Operand1, 617 BOOLEAN *LogicalResult) 618 { 619 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; 620 UINT64 Integer0; 621 UINT64 Integer1; 622 UINT32 Length0; 623 UINT32 Length1; 624 ACPI_STATUS Status = AE_OK; 625 BOOLEAN LocalResult = FALSE; 626 int Compare; 627 628 629 ACPI_FUNCTION_TRACE (ExDoLogicalOp); 630 631 632 /* 633 * Convert the second operand if necessary. The first operand 634 * determines the type of the second operand, (See the Data Types 635 * section of the ACPI 3.0+ specification.) Both object types are 636 * guaranteed to be either Integer/String/Buffer by the operand 637 * resolution mechanism. 638 */ 639 switch (Operand0->Common.Type) 640 { 641 case ACPI_TYPE_INTEGER: 642 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); 643 break; 644 645 case ACPI_TYPE_STRING: 646 Status = AcpiExConvertToString (Operand1, &LocalOperand1, 647 ACPI_IMPLICIT_CONVERT_HEX); 648 break; 649 650 case ACPI_TYPE_BUFFER: 651 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); 652 break; 653 654 default: 655 Status = AE_AML_INTERNAL; 656 break; 657 } 658 659 if (ACPI_FAILURE (Status)) 660 { 661 goto Cleanup; 662 } 663 664 /* 665 * Two cases: 1) Both Integers, 2) Both Strings or Buffers 666 */ 667 if (Operand0->Common.Type == ACPI_TYPE_INTEGER) 668 { 669 /* 670 * 1) Both operands are of type integer 671 * Note: LocalOperand1 may have changed above 672 */ 673 Integer0 = Operand0->Integer.Value; 674 Integer1 = LocalOperand1->Integer.Value; 675 676 switch (Opcode) 677 { 678 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 679 680 if (Integer0 == Integer1) 681 { 682 LocalResult = TRUE; 683 } 684 break; 685 686 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 687 688 if (Integer0 > Integer1) 689 { 690 LocalResult = TRUE; 691 } 692 break; 693 694 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 695 696 if (Integer0 < Integer1) 697 { 698 LocalResult = TRUE; 699 } 700 break; 701 702 default: 703 Status = AE_AML_INTERNAL; 704 break; 705 } 706 } 707 else 708 { 709 /* 710 * 2) Both operands are Strings or both are Buffers 711 * Note: Code below takes advantage of common Buffer/String 712 * object fields. LocalOperand1 may have changed above. Use 713 * memcmp to handle nulls in buffers. 714 */ 715 Length0 = Operand0->Buffer.Length; 716 Length1 = LocalOperand1->Buffer.Length; 717 718 /* Lexicographic compare: compare the data bytes */ 719 720 Compare = ACPI_MEMCMP (Operand0->Buffer.Pointer, 721 LocalOperand1->Buffer.Pointer, 722 (Length0 > Length1) ? Length1 : Length0); 723 724 switch (Opcode) 725 { 726 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 727 728 /* Length and all bytes must be equal */ 729 730 if ((Length0 == Length1) && 731 (Compare == 0)) 732 { 733 /* Length and all bytes match ==> TRUE */ 734 735 LocalResult = TRUE; 736 } 737 break; 738 739 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 740 741 if (Compare > 0) 742 { 743 LocalResult = TRUE; 744 goto Cleanup; /* TRUE */ 745 } 746 if (Compare < 0) 747 { 748 goto Cleanup; /* FALSE */ 749 } 750 751 /* Bytes match (to shortest length), compare lengths */ 752 753 if (Length0 > Length1) 754 { 755 LocalResult = TRUE; 756 } 757 break; 758 759 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 760 761 if (Compare > 0) 762 { 763 goto Cleanup; /* FALSE */ 764 } 765 if (Compare < 0) 766 { 767 LocalResult = TRUE; 768 goto Cleanup; /* TRUE */ 769 } 770 771 /* Bytes match (to shortest length), compare lengths */ 772 773 if (Length0 < Length1) 774 { 775 LocalResult = TRUE; 776 } 777 break; 778 779 default: 780 Status = AE_AML_INTERNAL; 781 break; 782 } 783 } 784 785 Cleanup: 786 787 /* New object was created if implicit conversion performed - delete */ 788 789 if (LocalOperand1 != Operand1) 790 { 791 AcpiUtRemoveReference (LocalOperand1); 792 } 793 794 /* Return the logical result and status */ 795 796 *LogicalResult = LocalResult; 797 return_ACPI_STATUS (Status); 798 } 799 800 801