1 /****************************************************************************** 2 * 3 * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2015, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44 #include "acpi.h" 45 #include "accommon.h" 46 #include "acinterp.h" 47 #include "amlcode.h" 48 #include "amlresrc.h" 49 50 51 #define _COMPONENT ACPI_EXECUTER 52 ACPI_MODULE_NAME ("exmisc") 53 54 55 /******************************************************************************* 56 * 57 * FUNCTION: AcpiExGetObjectReference 58 * 59 * PARAMETERS: ObjDesc - Create a reference to this object 60 * ReturnDesc - Where to store the reference 61 * WalkState - Current state 62 * 63 * RETURN: Status 64 * 65 * DESCRIPTION: Obtain and return a "reference" to the target object 66 * Common code for the RefOfOp and the CondRefOfOp. 67 * 68 ******************************************************************************/ 69 70 ACPI_STATUS 71 AcpiExGetObjectReference ( 72 ACPI_OPERAND_OBJECT *ObjDesc, 73 ACPI_OPERAND_OBJECT **ReturnDesc, 74 ACPI_WALK_STATE *WalkState) 75 { 76 ACPI_OPERAND_OBJECT *ReferenceObj; 77 ACPI_OPERAND_OBJECT *ReferencedObj; 78 79 80 ACPI_FUNCTION_TRACE_PTR (ExGetObjectReference, ObjDesc); 81 82 83 *ReturnDesc = NULL; 84 85 switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc)) 86 { 87 case ACPI_DESC_TYPE_OPERAND: 88 89 if (ObjDesc->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) 90 { 91 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 92 } 93 94 /* 95 * Must be a reference to a Local or Arg 96 */ 97 switch (ObjDesc->Reference.Class) 98 { 99 case ACPI_REFCLASS_LOCAL: 100 case ACPI_REFCLASS_ARG: 101 case ACPI_REFCLASS_DEBUG: 102 103 /* The referenced object is the pseudo-node for the local/arg */ 104 105 ReferencedObj = ObjDesc->Reference.Object; 106 break; 107 108 default: 109 110 ACPI_ERROR ((AE_INFO, "Unknown Reference Class 0x%2.2X", 111 ObjDesc->Reference.Class)); 112 return_ACPI_STATUS (AE_AML_INTERNAL); 113 } 114 break; 115 116 case ACPI_DESC_TYPE_NAMED: 117 /* 118 * A named reference that has already been resolved to a Node 119 */ 120 ReferencedObj = ObjDesc; 121 break; 122 123 default: 124 125 ACPI_ERROR ((AE_INFO, "Invalid descriptor type 0x%X", 126 ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))); 127 return_ACPI_STATUS (AE_TYPE); 128 } 129 130 131 /* Create a new reference object */ 132 133 ReferenceObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE); 134 if (!ReferenceObj) 135 { 136 return_ACPI_STATUS (AE_NO_MEMORY); 137 } 138 139 ReferenceObj->Reference.Class = ACPI_REFCLASS_REFOF; 140 ReferenceObj->Reference.Object = ReferencedObj; 141 *ReturnDesc = ReferenceObj; 142 143 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 144 "Object %p Type [%s], returning Reference %p\n", 145 ObjDesc, AcpiUtGetObjectTypeName (ObjDesc), *ReturnDesc)); 146 147 return_ACPI_STATUS (AE_OK); 148 } 149 150 151 /******************************************************************************* 152 * 153 * FUNCTION: AcpiExConcatTemplate 154 * 155 * PARAMETERS: Operand0 - First source object 156 * Operand1 - Second source object 157 * ActualReturnDesc - Where to place the return object 158 * WalkState - Current walk state 159 * 160 * RETURN: Status 161 * 162 * DESCRIPTION: Concatenate two resource templates 163 * 164 ******************************************************************************/ 165 166 ACPI_STATUS 167 AcpiExConcatTemplate ( 168 ACPI_OPERAND_OBJECT *Operand0, 169 ACPI_OPERAND_OBJECT *Operand1, 170 ACPI_OPERAND_OBJECT **ActualReturnDesc, 171 ACPI_WALK_STATE *WalkState) 172 { 173 ACPI_STATUS Status; 174 ACPI_OPERAND_OBJECT *ReturnDesc; 175 UINT8 *NewBuf; 176 UINT8 *EndTag; 177 ACPI_SIZE Length0; 178 ACPI_SIZE Length1; 179 ACPI_SIZE NewLength; 180 181 182 ACPI_FUNCTION_TRACE (ExConcatTemplate); 183 184 185 /* 186 * Find the EndTag descriptor in each resource template. 187 * Note1: returned pointers point TO the EndTag, not past it. 188 * Note2: zero-length buffers are allowed; treated like one EndTag 189 */ 190 191 /* Get the length of the first resource template */ 192 193 Status = AcpiUtGetResourceEndTag (Operand0, &EndTag); 194 if (ACPI_FAILURE (Status)) 195 { 196 return_ACPI_STATUS (Status); 197 } 198 199 Length0 = ACPI_PTR_DIFF (EndTag, Operand0->Buffer.Pointer); 200 201 /* Get the length of the second resource template */ 202 203 Status = AcpiUtGetResourceEndTag (Operand1, &EndTag); 204 if (ACPI_FAILURE (Status)) 205 { 206 return_ACPI_STATUS (Status); 207 } 208 209 Length1 = ACPI_PTR_DIFF (EndTag, Operand1->Buffer.Pointer); 210 211 /* Combine both lengths, minimum size will be 2 for EndTag */ 212 213 NewLength = Length0 + Length1 + sizeof (AML_RESOURCE_END_TAG); 214 215 /* Create a new buffer object for the result (with one EndTag) */ 216 217 ReturnDesc = AcpiUtCreateBufferObject (NewLength); 218 if (!ReturnDesc) 219 { 220 return_ACPI_STATUS (AE_NO_MEMORY); 221 } 222 223 /* 224 * Copy the templates to the new buffer, 0 first, then 1 follows. One 225 * EndTag descriptor is copied from Operand1. 226 */ 227 NewBuf = ReturnDesc->Buffer.Pointer; 228 memcpy (NewBuf, Operand0->Buffer.Pointer, Length0); 229 memcpy (NewBuf + Length0, Operand1->Buffer.Pointer, Length1); 230 231 /* Insert EndTag and set the checksum to zero, means "ignore checksum" */ 232 233 NewBuf[NewLength - 1] = 0; 234 NewBuf[NewLength - 2] = ACPI_RESOURCE_NAME_END_TAG | 1; 235 236 /* Return the completed resource template */ 237 238 *ActualReturnDesc = ReturnDesc; 239 return_ACPI_STATUS (AE_OK); 240 } 241 242 243 /******************************************************************************* 244 * 245 * FUNCTION: AcpiExDoConcatenate 246 * 247 * PARAMETERS: Operand0 - First source object 248 * Operand1 - Second source object 249 * ActualReturnDesc - Where to place the return object 250 * WalkState - Current walk state 251 * 252 * RETURN: Status 253 * 254 * DESCRIPTION: Concatenate two objects OF THE SAME TYPE. 255 * 256 ******************************************************************************/ 257 258 ACPI_STATUS 259 AcpiExDoConcatenate ( 260 ACPI_OPERAND_OBJECT *Operand0, 261 ACPI_OPERAND_OBJECT *Operand1, 262 ACPI_OPERAND_OBJECT **ActualReturnDesc, 263 ACPI_WALK_STATE *WalkState) 264 { 265 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; 266 ACPI_OPERAND_OBJECT *ReturnDesc; 267 char *NewBuf; 268 ACPI_STATUS Status; 269 270 271 ACPI_FUNCTION_TRACE (ExDoConcatenate); 272 273 274 /* 275 * Convert the second operand if necessary. The first operand 276 * determines the type of the second operand, (See the Data Types 277 * section of the ACPI specification.) Both object types are 278 * guaranteed to be either Integer/String/Buffer by the operand 279 * resolution mechanism. 280 */ 281 switch (Operand0->Common.Type) 282 { 283 case ACPI_TYPE_INTEGER: 284 285 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); 286 break; 287 288 case ACPI_TYPE_STRING: 289 290 Status = AcpiExConvertToString ( 291 Operand1, &LocalOperand1, ACPI_IMPLICIT_CONVERT_HEX); 292 break; 293 294 case ACPI_TYPE_BUFFER: 295 296 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); 297 break; 298 299 default: 300 301 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X", 302 Operand0->Common.Type)); 303 Status = AE_AML_INTERNAL; 304 } 305 306 if (ACPI_FAILURE (Status)) 307 { 308 goto Cleanup; 309 } 310 311 /* 312 * Both operands are now known to be the same object type 313 * (Both are Integer, String, or Buffer), and we can now perform the 314 * concatenation. 315 */ 316 317 /* 318 * There are three cases to handle: 319 * 320 * 1) Two Integers concatenated to produce a new Buffer 321 * 2) Two Strings concatenated to produce a new String 322 * 3) Two Buffers concatenated to produce a new Buffer 323 */ 324 switch (Operand0->Common.Type) 325 { 326 case ACPI_TYPE_INTEGER: 327 328 /* Result of two Integers is a Buffer */ 329 /* Need enough buffer space for two integers */ 330 331 ReturnDesc = AcpiUtCreateBufferObject ( 332 (ACPI_SIZE) ACPI_MUL_2 (AcpiGbl_IntegerByteWidth)); 333 if (!ReturnDesc) 334 { 335 Status = AE_NO_MEMORY; 336 goto Cleanup; 337 } 338 339 NewBuf = (char *) ReturnDesc->Buffer.Pointer; 340 341 /* Copy the first integer, LSB first */ 342 343 memcpy (NewBuf, &Operand0->Integer.Value, 344 AcpiGbl_IntegerByteWidth); 345 346 /* Copy the second integer (LSB first) after the first */ 347 348 memcpy (NewBuf + AcpiGbl_IntegerByteWidth, 349 &LocalOperand1->Integer.Value, AcpiGbl_IntegerByteWidth); 350 break; 351 352 case ACPI_TYPE_STRING: 353 354 /* Result of two Strings is a String */ 355 356 ReturnDesc = AcpiUtCreateStringObject ( 357 ((ACPI_SIZE) Operand0->String.Length + 358 LocalOperand1->String.Length)); 359 if (!ReturnDesc) 360 { 361 Status = AE_NO_MEMORY; 362 goto Cleanup; 363 } 364 365 NewBuf = ReturnDesc->String.Pointer; 366 367 /* Concatenate the strings */ 368 369 strcpy (NewBuf, Operand0->String.Pointer); 370 strcpy (NewBuf + Operand0->String.Length, 371 LocalOperand1->String.Pointer); 372 break; 373 374 case ACPI_TYPE_BUFFER: 375 376 /* Result of two Buffers is a Buffer */ 377 378 ReturnDesc = AcpiUtCreateBufferObject ( 379 ((ACPI_SIZE) Operand0->Buffer.Length + 380 LocalOperand1->Buffer.Length)); 381 if (!ReturnDesc) 382 { 383 Status = AE_NO_MEMORY; 384 goto Cleanup; 385 } 386 387 NewBuf = (char *) ReturnDesc->Buffer.Pointer; 388 389 /* Concatenate the buffers */ 390 391 memcpy (NewBuf, Operand0->Buffer.Pointer, 392 Operand0->Buffer.Length); 393 memcpy (NewBuf + Operand0->Buffer.Length, 394 LocalOperand1->Buffer.Pointer, 395 LocalOperand1->Buffer.Length); 396 break; 397 398 default: 399 400 /* Invalid object type, should not happen here */ 401 402 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X", 403 Operand0->Common.Type)); 404 Status =AE_AML_INTERNAL; 405 goto Cleanup; 406 } 407 408 *ActualReturnDesc = ReturnDesc; 409 410 Cleanup: 411 if (LocalOperand1 != Operand1) 412 { 413 AcpiUtRemoveReference (LocalOperand1); 414 } 415 return_ACPI_STATUS (Status); 416 } 417 418 419 /******************************************************************************* 420 * 421 * FUNCTION: AcpiExDoMathOp 422 * 423 * PARAMETERS: Opcode - AML opcode 424 * Integer0 - Integer operand #0 425 * Integer1 - Integer operand #1 426 * 427 * RETURN: Integer result of the operation 428 * 429 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the 430 * math functions here is to prevent a lot of pointer dereferencing 431 * to obtain the operands. 432 * 433 ******************************************************************************/ 434 435 UINT64 436 AcpiExDoMathOp ( 437 UINT16 Opcode, 438 UINT64 Integer0, 439 UINT64 Integer1) 440 { 441 442 ACPI_FUNCTION_ENTRY (); 443 444 445 switch (Opcode) 446 { 447 case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */ 448 449 return (Integer0 + Integer1); 450 451 case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */ 452 453 return (Integer0 & Integer1); 454 455 case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */ 456 457 return (~(Integer0 & Integer1)); 458 459 case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */ 460 461 return (Integer0 | Integer1); 462 463 case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */ 464 465 return (~(Integer0 | Integer1)); 466 467 case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */ 468 469 return (Integer0 ^ Integer1); 470 471 case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */ 472 473 return (Integer0 * Integer1); 474 475 case AML_SHIFT_LEFT_OP: /* ShiftLeft (Operand, ShiftCount, Result)*/ 476 477 /* 478 * We need to check if the shiftcount is larger than the integer bit 479 * width since the behavior of this is not well-defined in the C language. 480 */ 481 if (Integer1 >= AcpiGbl_IntegerBitWidth) 482 { 483 return (0); 484 } 485 return (Integer0 << Integer1); 486 487 case AML_SHIFT_RIGHT_OP: /* ShiftRight (Operand, ShiftCount, Result) */ 488 489 /* 490 * We need to check if the shiftcount is larger than the integer bit 491 * width since the behavior of this is not well-defined in the C language. 492 */ 493 if (Integer1 >= AcpiGbl_IntegerBitWidth) 494 { 495 return (0); 496 } 497 return (Integer0 >> Integer1); 498 499 case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */ 500 501 return (Integer0 - Integer1); 502 503 default: 504 505 return (0); 506 } 507 } 508 509 510 /******************************************************************************* 511 * 512 * FUNCTION: AcpiExDoLogicalNumericOp 513 * 514 * PARAMETERS: Opcode - AML opcode 515 * Integer0 - Integer operand #0 516 * Integer1 - Integer operand #1 517 * LogicalResult - TRUE/FALSE result of the operation 518 * 519 * RETURN: Status 520 * 521 * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric 522 * operators (LAnd and LOr), both operands must be integers. 523 * 524 * Note: cleanest machine code seems to be produced by the code 525 * below, rather than using statements of the form: 526 * Result = (Integer0 && Integer1); 527 * 528 ******************************************************************************/ 529 530 ACPI_STATUS 531 AcpiExDoLogicalNumericOp ( 532 UINT16 Opcode, 533 UINT64 Integer0, 534 UINT64 Integer1, 535 BOOLEAN *LogicalResult) 536 { 537 ACPI_STATUS Status = AE_OK; 538 BOOLEAN LocalResult = FALSE; 539 540 541 ACPI_FUNCTION_TRACE (ExDoLogicalNumericOp); 542 543 544 switch (Opcode) 545 { 546 case AML_LAND_OP: /* LAnd (Integer0, Integer1) */ 547 548 if (Integer0 && Integer1) 549 { 550 LocalResult = TRUE; 551 } 552 break; 553 554 case AML_LOR_OP: /* LOr (Integer0, Integer1) */ 555 556 if (Integer0 || Integer1) 557 { 558 LocalResult = TRUE; 559 } 560 break; 561 562 default: 563 564 Status = AE_AML_INTERNAL; 565 break; 566 } 567 568 /* Return the logical result and status */ 569 570 *LogicalResult = LocalResult; 571 return_ACPI_STATUS (Status); 572 } 573 574 575 /******************************************************************************* 576 * 577 * FUNCTION: AcpiExDoLogicalOp 578 * 579 * PARAMETERS: Opcode - AML opcode 580 * Operand0 - operand #0 581 * Operand1 - operand #1 582 * LogicalResult - TRUE/FALSE result of the operation 583 * 584 * RETURN: Status 585 * 586 * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the 587 * functions here is to prevent a lot of pointer dereferencing 588 * to obtain the operands and to simplify the generation of the 589 * logical value. For the Numeric operators (LAnd and LOr), both 590 * operands must be integers. For the other logical operators, 591 * operands can be any combination of Integer/String/Buffer. The 592 * first operand determines the type to which the second operand 593 * will be converted. 594 * 595 * Note: cleanest machine code seems to be produced by the code 596 * below, rather than using statements of the form: 597 * Result = (Operand0 == Operand1); 598 * 599 ******************************************************************************/ 600 601 ACPI_STATUS 602 AcpiExDoLogicalOp ( 603 UINT16 Opcode, 604 ACPI_OPERAND_OBJECT *Operand0, 605 ACPI_OPERAND_OBJECT *Operand1, 606 BOOLEAN *LogicalResult) 607 { 608 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; 609 UINT64 Integer0; 610 UINT64 Integer1; 611 UINT32 Length0; 612 UINT32 Length1; 613 ACPI_STATUS Status = AE_OK; 614 BOOLEAN LocalResult = FALSE; 615 int Compare; 616 617 618 ACPI_FUNCTION_TRACE (ExDoLogicalOp); 619 620 621 /* 622 * Convert the second operand if necessary. The first operand 623 * determines the type of the second operand, (See the Data Types 624 * section of the ACPI 3.0+ specification.) Both object types are 625 * guaranteed to be either Integer/String/Buffer by the operand 626 * resolution mechanism. 627 */ 628 switch (Operand0->Common.Type) 629 { 630 case ACPI_TYPE_INTEGER: 631 632 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); 633 break; 634 635 case ACPI_TYPE_STRING: 636 637 Status = AcpiExConvertToString ( 638 Operand1, &LocalOperand1, ACPI_IMPLICIT_CONVERT_HEX); 639 break; 640 641 case ACPI_TYPE_BUFFER: 642 643 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); 644 break; 645 646 default: 647 648 Status = AE_AML_INTERNAL; 649 break; 650 } 651 652 if (ACPI_FAILURE (Status)) 653 { 654 goto Cleanup; 655 } 656 657 /* 658 * Two cases: 1) Both Integers, 2) Both Strings or Buffers 659 */ 660 if (Operand0->Common.Type == ACPI_TYPE_INTEGER) 661 { 662 /* 663 * 1) Both operands are of type integer 664 * Note: LocalOperand1 may have changed above 665 */ 666 Integer0 = Operand0->Integer.Value; 667 Integer1 = LocalOperand1->Integer.Value; 668 669 switch (Opcode) 670 { 671 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 672 673 if (Integer0 == Integer1) 674 { 675 LocalResult = TRUE; 676 } 677 break; 678 679 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 680 681 if (Integer0 > Integer1) 682 { 683 LocalResult = TRUE; 684 } 685 break; 686 687 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 688 689 if (Integer0 < Integer1) 690 { 691 LocalResult = TRUE; 692 } 693 break; 694 695 default: 696 697 Status = AE_AML_INTERNAL; 698 break; 699 } 700 } 701 else 702 { 703 /* 704 * 2) Both operands are Strings or both are Buffers 705 * Note: Code below takes advantage of common Buffer/String 706 * object fields. LocalOperand1 may have changed above. Use 707 * memcmp to handle nulls in buffers. 708 */ 709 Length0 = Operand0->Buffer.Length; 710 Length1 = LocalOperand1->Buffer.Length; 711 712 /* Lexicographic compare: compare the data bytes */ 713 714 Compare = memcmp (Operand0->Buffer.Pointer, 715 LocalOperand1->Buffer.Pointer, 716 (Length0 > Length1) ? Length1 : Length0); 717 718 switch (Opcode) 719 { 720 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 721 722 /* Length and all bytes must be equal */ 723 724 if ((Length0 == Length1) && 725 (Compare == 0)) 726 { 727 /* Length and all bytes match ==> TRUE */ 728 729 LocalResult = TRUE; 730 } 731 break; 732 733 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 734 735 if (Compare > 0) 736 { 737 LocalResult = TRUE; 738 goto Cleanup; /* TRUE */ 739 } 740 if (Compare < 0) 741 { 742 goto Cleanup; /* FALSE */ 743 } 744 745 /* Bytes match (to shortest length), compare lengths */ 746 747 if (Length0 > Length1) 748 { 749 LocalResult = TRUE; 750 } 751 break; 752 753 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 754 755 if (Compare > 0) 756 { 757 goto Cleanup; /* FALSE */ 758 } 759 if (Compare < 0) 760 { 761 LocalResult = TRUE; 762 goto Cleanup; /* TRUE */ 763 } 764 765 /* Bytes match (to shortest length), compare lengths */ 766 767 if (Length0 < Length1) 768 { 769 LocalResult = TRUE; 770 } 771 break; 772 773 default: 774 775 Status = AE_AML_INTERNAL; 776 break; 777 } 778 } 779 780 Cleanup: 781 782 /* New object was created if implicit conversion performed - delete */ 783 784 if (LocalOperand1 != Operand1) 785 { 786 AcpiUtRemoveReference (LocalOperand1); 787 } 788 789 /* Return the logical result and status */ 790 791 *LogicalResult = LocalResult; 792 return_ACPI_STATUS (Status); 793 } 794