exmisc.c revision 151937
1 2/****************************************************************************** 3 * 4 * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes 5 * $Revision: 1.132 $ 6 * 7 *****************************************************************************/ 8 9/****************************************************************************** 10 * 11 * 1. Copyright Notice 12 * 13 * Some or all of this work - Copyright (c) 1999 - 2005, Intel Corp. 14 * All rights reserved. 15 * 16 * 2. License 17 * 18 * 2.1. This is your license from Intel Corp. under its intellectual property 19 * rights. You may have additional license terms from the party that provided 20 * you this software, covering your right to use that party's intellectual 21 * property rights. 22 * 23 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 24 * copy of the source code appearing in this file ("Covered Code") an 25 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 26 * base code distributed originally by Intel ("Original Intel Code") to copy, 27 * make derivatives, distribute, use and display any portion of the Covered 28 * Code in any form, with the right to sublicense such rights; and 29 * 30 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 31 * license (with the right to sublicense), under only those claims of Intel 32 * patents that are infringed by the Original Intel Code, to make, use, sell, 33 * offer to sell, and import the Covered Code and derivative works thereof 34 * solely to the minimum extent necessary to exercise the above copyright 35 * license, and in no event shall the patent license extend to any additions 36 * to or modifications of the Original Intel Code. No other license or right 37 * is granted directly or by implication, estoppel or otherwise; 38 * 39 * The above copyright and patent license is granted only if the following 40 * conditions are met: 41 * 42 * 3. Conditions 43 * 44 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 45 * Redistribution of source code of any substantial portion of the Covered 46 * Code or modification with rights to further distribute source must include 47 * the above Copyright Notice, the above License, this list of Conditions, 48 * and the following Disclaimer and Export Compliance provision. In addition, 49 * Licensee must cause all Covered Code to which Licensee contributes to 50 * contain a file documenting the changes Licensee made to create that Covered 51 * Code and the date of any change. Licensee must include in that file the 52 * documentation of any changes made by any predecessor Licensee. Licensee 53 * must include a prominent statement that the modification is derived, 54 * directly or indirectly, from Original Intel Code. 55 * 56 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 57 * Redistribution of source code of any substantial portion of the Covered 58 * Code or modification without rights to further distribute source must 59 * include the following Disclaimer and Export Compliance provision in the 60 * documentation and/or other materials provided with distribution. In 61 * addition, Licensee may not authorize further sublicense of source of any 62 * portion of the Covered Code, and must include terms to the effect that the 63 * license from Licensee to its licensee is limited to the intellectual 64 * property embodied in the software Licensee provides to its licensee, and 65 * not to intellectual property embodied in modifications its licensee may 66 * make. 67 * 68 * 3.3. Redistribution of Executable. Redistribution in executable form of any 69 * substantial portion of the Covered Code or modification must reproduce the 70 * above Copyright Notice, and the following Disclaimer and Export Compliance 71 * provision in the documentation and/or other materials provided with the 72 * distribution. 73 * 74 * 3.4. Intel retains all right, title, and interest in and to the Original 75 * Intel Code. 76 * 77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 78 * Intel shall be used in advertising or otherwise to promote the sale, use or 79 * other dealings in products derived from or relating to the Covered Code 80 * without prior written authorization from Intel. 81 * 82 * 4. Disclaimer and Export Compliance 83 * 84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 85 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 87 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 88 89 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 90 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 91 * PARTICULAR PURPOSE. 92 * 93 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 94 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 95 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 96 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 97 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 98 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 99 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 100 * LIMITED REMEDY. 101 * 102 * 4.3. Licensee shall not export, either directly or indirectly, any of this 103 * software or system incorporating such software without first obtaining any 104 * required license or other approval from the U. S. Department of Commerce or 105 * any other agency or department of the United States Government. In the 106 * event Licensee exports any such software from the United States or 107 * re-exports any such software from a foreign destination, Licensee shall 108 * ensure that the distribution and export/re-export of the software is in 109 * compliance with all laws, regulations, orders, or other restrictions of the 110 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 111 * any of its subsidiaries will export/re-export any technical data, process, 112 * software, or service, directly or indirectly, to any country for which the 113 * United States government or any agency thereof requires an export license, 114 * other governmental approval, or letter of assurance, without first obtaining 115 * such license, approval or letter. 116 * 117 *****************************************************************************/ 118 119#define __EXMISC_C__ 120 121#include <contrib/dev/acpica/acpi.h> 122#include <contrib/dev/acpica/acinterp.h> 123#include <contrib/dev/acpica/amlcode.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 145ACPI_STATUS 146AcpiExGetObjectReference ( 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 (ACPI_GET_OBJECT_TYPE (ObjDesc) != 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.Opcode) 173 { 174 case AML_LOCAL_OP: 175 case AML_ARG_OP: 176 case AML_DEBUG_OP: 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_REPORT_ERROR (("Unknown Reference opcode in GetReference %X\n", 186 ObjDesc->Reference.Opcode)); 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_REPORT_ERROR (("Invalid descriptor type in GetReference: %X\n", 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.Opcode = AML_REF_OF_OP; 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 244ACPI_STATUS 245AcpiExConcatTemplate ( 246 ACPI_OPERAND_OBJECT *Operand0, 247 ACPI_OPERAND_OBJECT *Operand1, 248 ACPI_OPERAND_OBJECT **ActualReturnDesc, 249 ACPI_WALK_STATE *WalkState) 250{ 251 ACPI_OPERAND_OBJECT *ReturnDesc; 252 UINT8 *NewBuf; 253 UINT8 *EndTag1; 254 UINT8 *EndTag2; 255 ACPI_SIZE Length1; 256 ACPI_SIZE Length2; 257 258 259 ACPI_FUNCTION_TRACE ("ExConcatTemplate"); 260 261 262 /* Find the EndTags in each resource template */ 263 264 EndTag1 = AcpiUtGetResourceEndTag (Operand0); 265 EndTag2 = AcpiUtGetResourceEndTag (Operand1); 266 if (!EndTag1 || !EndTag2) 267 { 268 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 269 } 270 271 /* Compute the length of each part */ 272 273 Length1 = ACPI_PTR_DIFF (EndTag1, Operand0->Buffer.Pointer); 274 Length2 = ACPI_PTR_DIFF (EndTag2, Operand1->Buffer.Pointer) + 275 2; /* Size of END_TAG */ 276 277 /* Create a new buffer object for the result */ 278 279 ReturnDesc = AcpiUtCreateBufferObject (Length1 + Length2); 280 if (!ReturnDesc) 281 { 282 return_ACPI_STATUS (AE_NO_MEMORY); 283 } 284 285 /* Copy the templates to the new descriptor */ 286 287 NewBuf = ReturnDesc->Buffer.Pointer; 288 ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer, Length1); 289 ACPI_MEMCPY (NewBuf + Length1, Operand1->Buffer.Pointer, Length2); 290 291 /* Compute the new checksum */ 292 293 NewBuf[ReturnDesc->Buffer.Length - 1] = 294 AcpiUtGenerateChecksum (ReturnDesc->Buffer.Pointer, 295 (ReturnDesc->Buffer.Length - 1)); 296 297 /* Return the completed template descriptor */ 298 299 *ActualReturnDesc = ReturnDesc; 300 return_ACPI_STATUS (AE_OK); 301} 302 303 304/******************************************************************************* 305 * 306 * FUNCTION: AcpiExDoConcatenate 307 * 308 * PARAMETERS: Operand0 - First source object 309 * Operand1 - Second source object 310 * ActualReturnDesc - Where to place the return object 311 * WalkState - Current walk state 312 * 313 * RETURN: Status 314 * 315 * DESCRIPTION: Concatenate two objects OF THE SAME TYPE. 316 * 317 ******************************************************************************/ 318 319ACPI_STATUS 320AcpiExDoConcatenate ( 321 ACPI_OPERAND_OBJECT *Operand0, 322 ACPI_OPERAND_OBJECT *Operand1, 323 ACPI_OPERAND_OBJECT **ActualReturnDesc, 324 ACPI_WALK_STATE *WalkState) 325{ 326 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; 327 ACPI_OPERAND_OBJECT *ReturnDesc; 328 char *NewBuf; 329 ACPI_STATUS Status; 330 ACPI_SIZE NewLength; 331 332 333 ACPI_FUNCTION_TRACE ("ExDoConcatenate"); 334 335 336 /* 337 * Convert the second operand if necessary. The first operand 338 * determines the type of the second operand, (See the Data Types 339 * section of the ACPI specification.) Both object types are 340 * guaranteed to be either Integer/String/Buffer by the operand 341 * resolution mechanism. 342 */ 343 switch (ACPI_GET_OBJECT_TYPE (Operand0)) 344 { 345 case ACPI_TYPE_INTEGER: 346 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); 347 break; 348 349 case ACPI_TYPE_STRING: 350 Status = AcpiExConvertToString (Operand1, &LocalOperand1, 351 ACPI_IMPLICIT_CONVERT_HEX); 352 break; 353 354 case ACPI_TYPE_BUFFER: 355 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); 356 break; 357 358 default: 359 ACPI_REPORT_ERROR (("Concat - invalid obj type: %X\n", 360 ACPI_GET_OBJECT_TYPE (Operand0))); 361 Status = AE_AML_INTERNAL; 362 } 363 364 if (ACPI_FAILURE (Status)) 365 { 366 goto Cleanup; 367 } 368 369 /* 370 * Both operands are now known to be the same object type 371 * (Both are Integer, String, or Buffer), and we can now perform the 372 * concatenation. 373 */ 374 375 /* 376 * There are three cases to handle: 377 * 378 * 1) Two Integers concatenated to produce a new Buffer 379 * 2) Two Strings concatenated to produce a new String 380 * 3) Two Buffers concatenated to produce a new Buffer 381 */ 382 switch (ACPI_GET_OBJECT_TYPE (Operand0)) 383 { 384 case ACPI_TYPE_INTEGER: 385 386 /* Result of two Integers is a Buffer */ 387 /* Need enough buffer space for two integers */ 388 389 ReturnDesc = AcpiUtCreateBufferObject ((ACPI_SIZE) 390 ACPI_MUL_2 (AcpiGbl_IntegerByteWidth)); 391 if (!ReturnDesc) 392 { 393 Status = AE_NO_MEMORY; 394 goto Cleanup; 395 } 396 397 NewBuf = (char *) ReturnDesc->Buffer.Pointer; 398 399 /* Copy the first integer, LSB first */ 400 401 ACPI_MEMCPY (NewBuf, 402 &Operand0->Integer.Value, 403 AcpiGbl_IntegerByteWidth); 404 405 /* Copy the second integer (LSB first) after the first */ 406 407 ACPI_MEMCPY (NewBuf + AcpiGbl_IntegerByteWidth, 408 &LocalOperand1->Integer.Value, 409 AcpiGbl_IntegerByteWidth); 410 break; 411 412 case ACPI_TYPE_STRING: 413 414 /* Result of two Strings is a String */ 415 416 NewLength = (ACPI_SIZE) Operand0->String.Length + 417 (ACPI_SIZE) LocalOperand1->String.Length; 418 if (NewLength > ACPI_MAX_STRING_CONVERSION) 419 { 420 Status = AE_AML_STRING_LIMIT; 421 goto Cleanup; 422 } 423 424 ReturnDesc = AcpiUtCreateStringObject (NewLength); 425 if (!ReturnDesc) 426 { 427 Status = AE_NO_MEMORY; 428 goto Cleanup; 429 } 430 431 NewBuf = ReturnDesc->String.Pointer; 432 433 /* Concatenate the strings */ 434 435 ACPI_STRCPY (NewBuf, 436 Operand0->String.Pointer); 437 ACPI_STRCPY (NewBuf + Operand0->String.Length, 438 LocalOperand1->String.Pointer); 439 break; 440 441 case ACPI_TYPE_BUFFER: 442 443 /* Result of two Buffers is a Buffer */ 444 445 ReturnDesc = AcpiUtCreateBufferObject ( 446 (ACPI_SIZE) Operand0->Buffer.Length + 447 (ACPI_SIZE) LocalOperand1->Buffer.Length); 448 if (!ReturnDesc) 449 { 450 Status = AE_NO_MEMORY; 451 goto Cleanup; 452 } 453 454 NewBuf = (char *) ReturnDesc->Buffer.Pointer; 455 456 /* Concatenate the buffers */ 457 458 ACPI_MEMCPY (NewBuf, 459 Operand0->Buffer.Pointer, 460 Operand0->Buffer.Length); 461 ACPI_MEMCPY (NewBuf + Operand0->Buffer.Length, 462 LocalOperand1->Buffer.Pointer, 463 LocalOperand1->Buffer.Length); 464 break; 465 466 default: 467 468 /* Invalid object type, should not happen here */ 469 470 ACPI_REPORT_ERROR (("Concatenate - Invalid object type: %X\n", 471 ACPI_GET_OBJECT_TYPE (Operand0))); 472 Status =AE_AML_INTERNAL; 473 goto Cleanup; 474 } 475 476 *ActualReturnDesc = ReturnDesc; 477 478Cleanup: 479 if (LocalOperand1 != Operand1) 480 { 481 AcpiUtRemoveReference (LocalOperand1); 482 } 483 return_ACPI_STATUS (Status); 484} 485 486 487/******************************************************************************* 488 * 489 * FUNCTION: AcpiExDoMathOp 490 * 491 * PARAMETERS: Opcode - AML opcode 492 * Integer0 - Integer operand #0 493 * Integer1 - Integer operand #1 494 * 495 * RETURN: Integer result of the operation 496 * 497 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the 498 * math functions here is to prevent a lot of pointer dereferencing 499 * to obtain the operands. 500 * 501 ******************************************************************************/ 502 503ACPI_INTEGER 504AcpiExDoMathOp ( 505 UINT16 Opcode, 506 ACPI_INTEGER Integer0, 507 ACPI_INTEGER Integer1) 508{ 509 510 ACPI_FUNCTION_ENTRY (); 511 512 513 switch (Opcode) 514 { 515 case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */ 516 517 return (Integer0 + Integer1); 518 519 520 case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */ 521 522 return (Integer0 & Integer1); 523 524 525 case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */ 526 527 return (~(Integer0 & Integer1)); 528 529 530 case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */ 531 532 return (Integer0 | Integer1); 533 534 535 case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */ 536 537 return (~(Integer0 | Integer1)); 538 539 540 case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */ 541 542 return (Integer0 ^ Integer1); 543 544 545 case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */ 546 547 return (Integer0 * Integer1); 548 549 550 case AML_SHIFT_LEFT_OP: /* ShiftLeft (Operand, ShiftCount, Result)*/ 551 552 return (Integer0 << Integer1); 553 554 555 case AML_SHIFT_RIGHT_OP: /* ShiftRight (Operand, ShiftCount, Result) */ 556 557 return (Integer0 >> Integer1); 558 559 560 case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */ 561 562 return (Integer0 - Integer1); 563 564 default: 565 566 return (0); 567 } 568} 569 570 571/******************************************************************************* 572 * 573 * FUNCTION: AcpiExDoLogicalNumericOp 574 * 575 * PARAMETERS: Opcode - AML opcode 576 * Integer0 - Integer operand #0 577 * Integer1 - Integer operand #1 578 * LogicalResult - TRUE/FALSE result of the operation 579 * 580 * RETURN: Status 581 * 582 * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric 583 * operators (LAnd and LOr), both operands must be integers. 584 * 585 * Note: cleanest machine code seems to be produced by the code 586 * below, rather than using statements of the form: 587 * Result = (Integer0 && Integer1); 588 * 589 ******************************************************************************/ 590 591ACPI_STATUS 592AcpiExDoLogicalNumericOp ( 593 UINT16 Opcode, 594 ACPI_INTEGER Integer0, 595 ACPI_INTEGER Integer1, 596 BOOLEAN *LogicalResult) 597{ 598 ACPI_STATUS Status = AE_OK; 599 BOOLEAN LocalResult = FALSE; 600 601 602 ACPI_FUNCTION_TRACE ("ExDoLogicalNumericOp"); 603 604 605 switch (Opcode) 606 { 607 case AML_LAND_OP: /* LAnd (Integer0, Integer1) */ 608 609 if (Integer0 && Integer1) 610 { 611 LocalResult = TRUE; 612 } 613 break; 614 615 case AML_LOR_OP: /* LOr (Integer0, Integer1) */ 616 617 if (Integer0 || Integer1) 618 { 619 LocalResult = TRUE; 620 } 621 break; 622 623 default: 624 Status = AE_AML_INTERNAL; 625 break; 626 } 627 628 /* Return the logical result and status */ 629 630 *LogicalResult = LocalResult; 631 return_ACPI_STATUS (Status); 632} 633 634 635/******************************************************************************* 636 * 637 * FUNCTION: AcpiExDoLogicalOp 638 * 639 * PARAMETERS: Opcode - AML opcode 640 * Operand0 - operand #0 641 * Operand1 - operand #1 642 * LogicalResult - TRUE/FALSE result of the operation 643 * 644 * RETURN: Status 645 * 646 * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the 647 * functions here is to prevent a lot of pointer dereferencing 648 * to obtain the operands and to simplify the generation of the 649 * logical value. For the Numeric operators (LAnd and LOr), both 650 * operands must be integers. For the other logical operators, 651 * operands can be any combination of Integer/String/Buffer. The 652 * first operand determines the type to which the second operand 653 * will be converted. 654 * 655 * Note: cleanest machine code seems to be produced by the code 656 * below, rather than using statements of the form: 657 * Result = (Operand0 == Operand1); 658 * 659 ******************************************************************************/ 660 661ACPI_STATUS 662AcpiExDoLogicalOp ( 663 UINT16 Opcode, 664 ACPI_OPERAND_OBJECT *Operand0, 665 ACPI_OPERAND_OBJECT *Operand1, 666 BOOLEAN *LogicalResult) 667{ 668 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; 669 ACPI_INTEGER Integer0; 670 ACPI_INTEGER Integer1; 671 UINT32 Length0; 672 UINT32 Length1; 673 ACPI_STATUS Status = AE_OK; 674 BOOLEAN LocalResult = FALSE; 675 int Compare; 676 677 678 ACPI_FUNCTION_TRACE ("ExDoLogicalOp"); 679 680 681 /* 682 * Convert the second operand if necessary. The first operand 683 * determines the type of the second operand, (See the Data Types 684 * section of the ACPI 3.0+ specification.) Both object types are 685 * guaranteed to be either Integer/String/Buffer by the operand 686 * resolution mechanism. 687 */ 688 switch (ACPI_GET_OBJECT_TYPE (Operand0)) 689 { 690 case ACPI_TYPE_INTEGER: 691 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); 692 break; 693 694 case ACPI_TYPE_STRING: 695 Status = AcpiExConvertToString (Operand1, &LocalOperand1, 696 ACPI_IMPLICIT_CONVERT_HEX); 697 break; 698 699 case ACPI_TYPE_BUFFER: 700 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); 701 break; 702 703 default: 704 Status = AE_AML_INTERNAL; 705 break; 706 } 707 708 if (ACPI_FAILURE (Status)) 709 { 710 goto Cleanup; 711 } 712 713 /* 714 * Two cases: 1) Both Integers, 2) Both Strings or Buffers 715 */ 716 if (ACPI_GET_OBJECT_TYPE (Operand0) == ACPI_TYPE_INTEGER) 717 { 718 /* 719 * 1) Both operands are of type integer 720 * Note: LocalOperand1 may have changed above 721 */ 722 Integer0 = Operand0->Integer.Value; 723 Integer1 = LocalOperand1->Integer.Value; 724 725 switch (Opcode) 726 { 727 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 728 729 if (Integer0 == Integer1) 730 { 731 LocalResult = TRUE; 732 } 733 break; 734 735 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 736 737 if (Integer0 > Integer1) 738 { 739 LocalResult = TRUE; 740 } 741 break; 742 743 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 744 745 if (Integer0 < Integer1) 746 { 747 LocalResult = TRUE; 748 } 749 break; 750 751 default: 752 Status = AE_AML_INTERNAL; 753 break; 754 } 755 } 756 else 757 { 758 /* 759 * 2) Both operands are Strings or both are Buffers 760 * Note: Code below takes advantage of common Buffer/String 761 * object fields. LocalOperand1 may have changed above. Use 762 * memcmp to handle nulls in buffers. 763 */ 764 Length0 = Operand0->Buffer.Length; 765 Length1 = LocalOperand1->Buffer.Length; 766 767 /* Lexicographic compare: compare the data bytes */ 768 769 Compare = ACPI_MEMCMP (Operand0->Buffer.Pointer, 770 LocalOperand1->Buffer.Pointer, 771 (Length0 > Length1) ? Length1 : Length0); 772 773 switch (Opcode) 774 { 775 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 776 777 /* Length and all bytes must be equal */ 778 779 if ((Length0 == Length1) && 780 (Compare == 0)) 781 { 782 /* Length and all bytes match ==> TRUE */ 783 784 LocalResult = TRUE; 785 } 786 break; 787 788 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 789 790 if (Compare > 0) 791 { 792 LocalResult = TRUE; 793 goto Cleanup; /* TRUE */ 794 } 795 if (Compare < 0) 796 { 797 goto Cleanup; /* FALSE */ 798 } 799 800 /* Bytes match (to shortest length), compare lengths */ 801 802 if (Length0 > Length1) 803 { 804 LocalResult = TRUE; 805 } 806 break; 807 808 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 809 810 if (Compare > 0) 811 { 812 goto Cleanup; /* FALSE */ 813 } 814 if (Compare < 0) 815 { 816 LocalResult = TRUE; 817 goto Cleanup; /* TRUE */ 818 } 819 820 /* Bytes match (to shortest length), compare lengths */ 821 822 if (Length0 < Length1) 823 { 824 LocalResult = TRUE; 825 } 826 break; 827 828 default: 829 Status = AE_AML_INTERNAL; 830 break; 831 } 832 } 833 834Cleanup: 835 836 /* New object was created if implicit conversion performed - delete */ 837 838 if (LocalOperand1 != Operand1) 839 { 840 AcpiUtRemoveReference (LocalOperand1); 841 } 842 843 /* Return the logical result and status */ 844 845 *LogicalResult = LocalResult; 846 return_ACPI_STATUS (Status); 847} 848 849 850