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 (Operand1, &LocalOperand1, 291 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 ((ACPI_SIZE) 332 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, 350 AcpiGbl_IntegerByteWidth); 351 break; 352 353 case ACPI_TYPE_STRING: 354 355 /* Result of two Strings is a String */ 356 357 ReturnDesc = AcpiUtCreateStringObject ( 358 ((ACPI_SIZE) Operand0->String.Length + 359 LocalOperand1->String.Length)); 360 if (!ReturnDesc) 361 { 362 Status = AE_NO_MEMORY; 363 goto Cleanup; 364 } 365 366 NewBuf = ReturnDesc->String.Pointer; 367 368 /* Concatenate the strings */ 369 370 strcpy (NewBuf, Operand0->String.Pointer); 371 strcpy (NewBuf + Operand0->String.Length, 372 LocalOperand1->String.Pointer); 373 break; 374 375 case ACPI_TYPE_BUFFER: 376 377 /* Result of two Buffers is a Buffer */ 378 379 ReturnDesc = AcpiUtCreateBufferObject ( 380 ((ACPI_SIZE) Operand0->Buffer.Length + 381 LocalOperand1->Buffer.Length)); 382 if (!ReturnDesc) 383 { 384 Status = AE_NO_MEMORY; 385 goto Cleanup; 386 } 387 388 NewBuf = (char *) ReturnDesc->Buffer.Pointer; 389 390 /* Concatenate the buffers */ 391 392 memcpy (NewBuf, Operand0->Buffer.Pointer, 393 Operand0->Buffer.Length); 394 memcpy (NewBuf + Operand0->Buffer.Length, 395 LocalOperand1->Buffer.Pointer, 396 LocalOperand1->Buffer.Length); 397 break; 398 399 default: 400 401 /* Invalid object type, should not happen here */ 402 403 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X", 404 Operand0->Common.Type)); 405 Status =AE_AML_INTERNAL; 406 goto Cleanup; 407 } 408 409 *ActualReturnDesc = ReturnDesc; 410 411 Cleanup: 412 if (LocalOperand1 != Operand1) 413 { 414 AcpiUtRemoveReference (LocalOperand1); 415 } 416 return_ACPI_STATUS (Status); 417 } 418 419 420 /******************************************************************************* 421 * 422 * FUNCTION: AcpiExDoMathOp 423 * 424 * PARAMETERS: Opcode - AML opcode 425 * Integer0 - Integer operand #0 426 * Integer1 - Integer operand #1 427 * 428 * RETURN: Integer result of the operation 429 * 430 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the 431 * math functions here is to prevent a lot of pointer dereferencing 432 * to obtain the operands. 433 * 434 ******************************************************************************/ 435 436 UINT64 437 AcpiExDoMathOp ( 438 UINT16 Opcode, 439 UINT64 Integer0, 440 UINT64 Integer1) 441 { 442 443 ACPI_FUNCTION_ENTRY (); 444 445 446 switch (Opcode) 447 { 448 case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */ 449 450 return (Integer0 + Integer1); 451 452 case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */ 453 454 return (Integer0 & Integer1); 455 456 case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */ 457 458 return (~(Integer0 & Integer1)); 459 460 case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */ 461 462 return (Integer0 | Integer1); 463 464 case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */ 465 466 return (~(Integer0 | Integer1)); 467 468 case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */ 469 470 return (Integer0 ^ Integer1); 471 472 case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */ 473 474 return (Integer0 * Integer1); 475 476 case AML_SHIFT_LEFT_OP: /* ShiftLeft (Operand, ShiftCount, Result)*/ 477 478 /* 479 * We need to check if the shiftcount is larger than the integer bit 480 * width since the behavior of this is not well-defined in the C language. 481 */ 482 if (Integer1 >= AcpiGbl_IntegerBitWidth) 483 { 484 return (0); 485 } 486 return (Integer0 << Integer1); 487 488 case AML_SHIFT_RIGHT_OP: /* ShiftRight (Operand, ShiftCount, Result) */ 489 490 /* 491 * We need to check if the shiftcount is larger than the integer bit 492 * width since the behavior of this is not well-defined in the C language. 493 */ 494 if (Integer1 >= AcpiGbl_IntegerBitWidth) 495 { 496 return (0); 497 } 498 return (Integer0 >> Integer1); 499 500 case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */ 501 502 return (Integer0 - Integer1); 503 504 default: 505 506 return (0); 507 } 508 } 509 510 511 /******************************************************************************* 512 * 513 * FUNCTION: AcpiExDoLogicalNumericOp 514 * 515 * PARAMETERS: Opcode - AML opcode 516 * Integer0 - Integer operand #0 517 * Integer1 - Integer operand #1 518 * LogicalResult - TRUE/FALSE result of the operation 519 * 520 * RETURN: Status 521 * 522 * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric 523 * operators (LAnd and LOr), both operands must be integers. 524 * 525 * Note: cleanest machine code seems to be produced by the code 526 * below, rather than using statements of the form: 527 * Result = (Integer0 && Integer1); 528 * 529 ******************************************************************************/ 530 531 ACPI_STATUS 532 AcpiExDoLogicalNumericOp ( 533 UINT16 Opcode, 534 UINT64 Integer0, 535 UINT64 Integer1, 536 BOOLEAN *LogicalResult) 537 { 538 ACPI_STATUS Status = AE_OK; 539 BOOLEAN LocalResult = FALSE; 540 541 542 ACPI_FUNCTION_TRACE (ExDoLogicalNumericOp); 543 544 545 switch (Opcode) 546 { 547 case AML_LAND_OP: /* LAnd (Integer0, Integer1) */ 548 549 if (Integer0 && Integer1) 550 { 551 LocalResult = TRUE; 552 } 553 break; 554 555 case AML_LOR_OP: /* LOr (Integer0, Integer1) */ 556 557 if (Integer0 || Integer1) 558 { 559 LocalResult = TRUE; 560 } 561 break; 562 563 default: 564 565 Status = AE_AML_INTERNAL; 566 break; 567 } 568 569 /* Return the logical result and status */ 570 571 *LogicalResult = LocalResult; 572 return_ACPI_STATUS (Status); 573 } 574 575 576 /******************************************************************************* 577 * 578 * FUNCTION: AcpiExDoLogicalOp 579 * 580 * PARAMETERS: Opcode - AML opcode 581 * Operand0 - operand #0 582 * Operand1 - operand #1 583 * LogicalResult - TRUE/FALSE result of the operation 584 * 585 * RETURN: Status 586 * 587 * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the 588 * functions here is to prevent a lot of pointer dereferencing 589 * to obtain the operands and to simplify the generation of the 590 * logical value. For the Numeric operators (LAnd and LOr), both 591 * operands must be integers. For the other logical operators, 592 * operands can be any combination of Integer/String/Buffer. The 593 * first operand determines the type to which the second operand 594 * will be converted. 595 * 596 * Note: cleanest machine code seems to be produced by the code 597 * below, rather than using statements of the form: 598 * Result = (Operand0 == Operand1); 599 * 600 ******************************************************************************/ 601 602 ACPI_STATUS 603 AcpiExDoLogicalOp ( 604 UINT16 Opcode, 605 ACPI_OPERAND_OBJECT *Operand0, 606 ACPI_OPERAND_OBJECT *Operand1, 607 BOOLEAN *LogicalResult) 608 { 609 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; 610 UINT64 Integer0; 611 UINT64 Integer1; 612 UINT32 Length0; 613 UINT32 Length1; 614 ACPI_STATUS Status = AE_OK; 615 BOOLEAN LocalResult = FALSE; 616 int Compare; 617 618 619 ACPI_FUNCTION_TRACE (ExDoLogicalOp); 620 621 622 /* 623 * Convert the second operand if necessary. The first operand 624 * determines the type of the second operand, (See the Data Types 625 * section of the ACPI 3.0+ specification.) Both object types are 626 * guaranteed to be either Integer/String/Buffer by the operand 627 * resolution mechanism. 628 */ 629 switch (Operand0->Common.Type) 630 { 631 case ACPI_TYPE_INTEGER: 632 633 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); 634 break; 635 636 case ACPI_TYPE_STRING: 637 638 Status = AcpiExConvertToString (Operand1, &LocalOperand1, 639 ACPI_IMPLICIT_CONVERT_HEX); 640 break; 641 642 case ACPI_TYPE_BUFFER: 643 644 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); 645 break; 646 647 default: 648 649 Status = AE_AML_INTERNAL; 650 break; 651 } 652 653 if (ACPI_FAILURE (Status)) 654 { 655 goto Cleanup; 656 } 657 658 /* 659 * Two cases: 1) Both Integers, 2) Both Strings or Buffers 660 */ 661 if (Operand0->Common.Type == ACPI_TYPE_INTEGER) 662 { 663 /* 664 * 1) Both operands are of type integer 665 * Note: LocalOperand1 may have changed above 666 */ 667 Integer0 = Operand0->Integer.Value; 668 Integer1 = LocalOperand1->Integer.Value; 669 670 switch (Opcode) 671 { 672 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 673 674 if (Integer0 == Integer1) 675 { 676 LocalResult = TRUE; 677 } 678 break; 679 680 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 681 682 if (Integer0 > Integer1) 683 { 684 LocalResult = TRUE; 685 } 686 break; 687 688 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 689 690 if (Integer0 < Integer1) 691 { 692 LocalResult = TRUE; 693 } 694 break; 695 696 default: 697 698 Status = AE_AML_INTERNAL; 699 break; 700 } 701 } 702 else 703 { 704 /* 705 * 2) Both operands are Strings or both are Buffers 706 * Note: Code below takes advantage of common Buffer/String 707 * object fields. LocalOperand1 may have changed above. Use 708 * memcmp to handle nulls in buffers. 709 */ 710 Length0 = Operand0->Buffer.Length; 711 Length1 = LocalOperand1->Buffer.Length; 712 713 /* Lexicographic compare: compare the data bytes */ 714 715 Compare = memcmp (Operand0->Buffer.Pointer, 716 LocalOperand1->Buffer.Pointer, 717 (Length0 > Length1) ? Length1 : Length0); 718 719 switch (Opcode) 720 { 721 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 722 723 /* Length and all bytes must be equal */ 724 725 if ((Length0 == Length1) && 726 (Compare == 0)) 727 { 728 /* Length and all bytes match ==> TRUE */ 729 730 LocalResult = TRUE; 731 } 732 break; 733 734 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 735 736 if (Compare > 0) 737 { 738 LocalResult = TRUE; 739 goto Cleanup; /* TRUE */ 740 } 741 if (Compare < 0) 742 { 743 goto Cleanup; /* FALSE */ 744 } 745 746 /* Bytes match (to shortest length), compare lengths */ 747 748 if (Length0 > Length1) 749 { 750 LocalResult = TRUE; 751 } 752 break; 753 754 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 755 756 if (Compare > 0) 757 { 758 goto Cleanup; /* FALSE */ 759 } 760 if (Compare < 0) 761 { 762 LocalResult = TRUE; 763 goto Cleanup; /* TRUE */ 764 } 765 766 /* Bytes match (to shortest length), compare lengths */ 767 768 if (Length0 < Length1) 769 { 770 LocalResult = TRUE; 771 } 772 break; 773 774 default: 775 776 Status = AE_AML_INTERNAL; 777 break; 778 } 779 } 780 781 Cleanup: 782 783 /* New object was created if implicit conversion performed - delete */ 784 785 if (LocalOperand1 != Operand1) 786 { 787 AcpiUtRemoveReference (LocalOperand1); 788 } 789 790 /* Return the logical result and status */ 791 792 *LogicalResult = LocalResult; 793 return_ACPI_STATUS (Status); 794 } 795