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 - 2014, 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 case ACPI_DESC_TYPE_NAMED: 192 /* 193 * A named reference that has already been resolved to a Node 194 */ 195 ReferencedObj = ObjDesc; 196 break; 197 198 default: 199 200 ACPI_ERROR ((AE_INFO, "Invalid descriptor type 0x%X", 201 ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))); 202 return_ACPI_STATUS (AE_TYPE); 203 } 204 205 206 /* Create a new reference object */ 207 208 ReferenceObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE); 209 if (!ReferenceObj) 210 { 211 return_ACPI_STATUS (AE_NO_MEMORY); 212 } 213 214 ReferenceObj->Reference.Class = ACPI_REFCLASS_REFOF; 215 ReferenceObj->Reference.Object = ReferencedObj; 216 *ReturnDesc = ReferenceObj; 217 218 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 219 "Object %p Type [%s], returning Reference %p\n", 220 ObjDesc, AcpiUtGetObjectTypeName (ObjDesc), *ReturnDesc)); 221 222 return_ACPI_STATUS (AE_OK); 223 } 224 225 226 /******************************************************************************* 227 * 228 * FUNCTION: AcpiExConcatTemplate 229 * 230 * PARAMETERS: Operand0 - First source object 231 * Operand1 - Second source object 232 * ActualReturnDesc - Where to place the return object 233 * WalkState - Current walk state 234 * 235 * RETURN: Status 236 * 237 * DESCRIPTION: Concatenate two resource templates 238 * 239 ******************************************************************************/ 240 241 ACPI_STATUS 242 AcpiExConcatTemplate ( 243 ACPI_OPERAND_OBJECT *Operand0, 244 ACPI_OPERAND_OBJECT *Operand1, 245 ACPI_OPERAND_OBJECT **ActualReturnDesc, 246 ACPI_WALK_STATE *WalkState) 247 { 248 ACPI_STATUS Status; 249 ACPI_OPERAND_OBJECT *ReturnDesc; 250 UINT8 *NewBuf; 251 UINT8 *EndTag; 252 ACPI_SIZE Length0; 253 ACPI_SIZE Length1; 254 ACPI_SIZE NewLength; 255 256 257 ACPI_FUNCTION_TRACE (ExConcatTemplate); 258 259 260 /* 261 * Find the EndTag descriptor in each resource template. 262 * Note1: returned pointers point TO the EndTag, not past it. 263 * Note2: zero-length buffers are allowed; treated like one EndTag 264 */ 265 266 /* Get the length of the first resource template */ 267 268 Status = AcpiUtGetResourceEndTag (Operand0, &EndTag); 269 if (ACPI_FAILURE (Status)) 270 { 271 return_ACPI_STATUS (Status); 272 } 273 274 Length0 = ACPI_PTR_DIFF (EndTag, Operand0->Buffer.Pointer); 275 276 /* Get the length of the second resource template */ 277 278 Status = AcpiUtGetResourceEndTag (Operand1, &EndTag); 279 if (ACPI_FAILURE (Status)) 280 { 281 return_ACPI_STATUS (Status); 282 } 283 284 Length1 = ACPI_PTR_DIFF (EndTag, Operand1->Buffer.Pointer); 285 286 /* Combine both lengths, minimum size will be 2 for EndTag */ 287 288 NewLength = Length0 + Length1 + sizeof (AML_RESOURCE_END_TAG); 289 290 /* Create a new buffer object for the result (with one EndTag) */ 291 292 ReturnDesc = AcpiUtCreateBufferObject (NewLength); 293 if (!ReturnDesc) 294 { 295 return_ACPI_STATUS (AE_NO_MEMORY); 296 } 297 298 /* 299 * Copy the templates to the new buffer, 0 first, then 1 follows. One 300 * EndTag descriptor is copied from Operand1. 301 */ 302 NewBuf = ReturnDesc->Buffer.Pointer; 303 ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer, Length0); 304 ACPI_MEMCPY (NewBuf + Length0, Operand1->Buffer.Pointer, Length1); 305 306 /* Insert EndTag and set the checksum to zero, means "ignore checksum" */ 307 308 NewBuf[NewLength - 1] = 0; 309 NewBuf[NewLength - 2] = ACPI_RESOURCE_NAME_END_TAG | 1; 310 311 /* Return the completed resource template */ 312 313 *ActualReturnDesc = ReturnDesc; 314 return_ACPI_STATUS (AE_OK); 315 } 316 317 318 /******************************************************************************* 319 * 320 * FUNCTION: AcpiExDoConcatenate 321 * 322 * PARAMETERS: Operand0 - First source object 323 * Operand1 - Second source object 324 * ActualReturnDesc - Where to place the return object 325 * WalkState - Current walk state 326 * 327 * RETURN: Status 328 * 329 * DESCRIPTION: Concatenate two objects OF THE SAME TYPE. 330 * 331 ******************************************************************************/ 332 333 ACPI_STATUS 334 AcpiExDoConcatenate ( 335 ACPI_OPERAND_OBJECT *Operand0, 336 ACPI_OPERAND_OBJECT *Operand1, 337 ACPI_OPERAND_OBJECT **ActualReturnDesc, 338 ACPI_WALK_STATE *WalkState) 339 { 340 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; 341 ACPI_OPERAND_OBJECT *ReturnDesc; 342 char *NewBuf; 343 ACPI_STATUS Status; 344 345 346 ACPI_FUNCTION_TRACE (ExDoConcatenate); 347 348 349 /* 350 * Convert the second operand if necessary. The first operand 351 * determines the type of the second operand, (See the Data Types 352 * section of the ACPI specification.) Both object types are 353 * guaranteed to be either Integer/String/Buffer by the operand 354 * resolution mechanism. 355 */ 356 switch (Operand0->Common.Type) 357 { 358 case ACPI_TYPE_INTEGER: 359 360 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); 361 break; 362 363 case ACPI_TYPE_STRING: 364 365 Status = AcpiExConvertToString (Operand1, &LocalOperand1, 366 ACPI_IMPLICIT_CONVERT_HEX); 367 break; 368 369 case ACPI_TYPE_BUFFER: 370 371 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); 372 break; 373 374 default: 375 376 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X", 377 Operand0->Common.Type)); 378 Status = AE_AML_INTERNAL; 379 } 380 381 if (ACPI_FAILURE (Status)) 382 { 383 goto Cleanup; 384 } 385 386 /* 387 * Both operands are now known to be the same object type 388 * (Both are Integer, String, or Buffer), and we can now perform the 389 * concatenation. 390 */ 391 392 /* 393 * There are three cases to handle: 394 * 395 * 1) Two Integers concatenated to produce a new Buffer 396 * 2) Two Strings concatenated to produce a new String 397 * 3) Two Buffers concatenated to produce a new Buffer 398 */ 399 switch (Operand0->Common.Type) 400 { 401 case ACPI_TYPE_INTEGER: 402 403 /* Result of two Integers is a Buffer */ 404 /* Need enough buffer space for two integers */ 405 406 ReturnDesc = AcpiUtCreateBufferObject ((ACPI_SIZE) 407 ACPI_MUL_2 (AcpiGbl_IntegerByteWidth)); 408 if (!ReturnDesc) 409 { 410 Status = AE_NO_MEMORY; 411 goto Cleanup; 412 } 413 414 NewBuf = (char *) ReturnDesc->Buffer.Pointer; 415 416 /* Copy the first integer, LSB first */ 417 418 ACPI_MEMCPY (NewBuf, &Operand0->Integer.Value, 419 AcpiGbl_IntegerByteWidth); 420 421 /* Copy the second integer (LSB first) after the first */ 422 423 ACPI_MEMCPY (NewBuf + AcpiGbl_IntegerByteWidth, 424 &LocalOperand1->Integer.Value, 425 AcpiGbl_IntegerByteWidth); 426 break; 427 428 case ACPI_TYPE_STRING: 429 430 /* Result of two Strings is a String */ 431 432 ReturnDesc = AcpiUtCreateStringObject ( 433 ((ACPI_SIZE) Operand0->String.Length + 434 LocalOperand1->String.Length)); 435 if (!ReturnDesc) 436 { 437 Status = AE_NO_MEMORY; 438 goto Cleanup; 439 } 440 441 NewBuf = ReturnDesc->String.Pointer; 442 443 /* Concatenate the strings */ 444 445 ACPI_STRCPY (NewBuf, Operand0->String.Pointer); 446 ACPI_STRCPY (NewBuf + Operand0->String.Length, 447 LocalOperand1->String.Pointer); 448 break; 449 450 case ACPI_TYPE_BUFFER: 451 452 /* Result of two Buffers is a Buffer */ 453 454 ReturnDesc = AcpiUtCreateBufferObject ( 455 ((ACPI_SIZE) Operand0->Buffer.Length + 456 LocalOperand1->Buffer.Length)); 457 if (!ReturnDesc) 458 { 459 Status = AE_NO_MEMORY; 460 goto Cleanup; 461 } 462 463 NewBuf = (char *) ReturnDesc->Buffer.Pointer; 464 465 /* Concatenate the buffers */ 466 467 ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer, 468 Operand0->Buffer.Length); 469 ACPI_MEMCPY (NewBuf + Operand0->Buffer.Length, 470 LocalOperand1->Buffer.Pointer, 471 LocalOperand1->Buffer.Length); 472 break; 473 474 default: 475 476 /* Invalid object type, should not happen here */ 477 478 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X", 479 Operand0->Common.Type)); 480 Status =AE_AML_INTERNAL; 481 goto Cleanup; 482 } 483 484 *ActualReturnDesc = ReturnDesc; 485 486 Cleanup: 487 if (LocalOperand1 != Operand1) 488 { 489 AcpiUtRemoveReference (LocalOperand1); 490 } 491 return_ACPI_STATUS (Status); 492 } 493 494 495 /******************************************************************************* 496 * 497 * FUNCTION: AcpiExDoMathOp 498 * 499 * PARAMETERS: Opcode - AML opcode 500 * Integer0 - Integer operand #0 501 * Integer1 - Integer operand #1 502 * 503 * RETURN: Integer result of the operation 504 * 505 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the 506 * math functions here is to prevent a lot of pointer dereferencing 507 * to obtain the operands. 508 * 509 ******************************************************************************/ 510 511 UINT64 512 AcpiExDoMathOp ( 513 UINT16 Opcode, 514 UINT64 Integer0, 515 UINT64 Integer1) 516 { 517 518 ACPI_FUNCTION_ENTRY (); 519 520 521 switch (Opcode) 522 { 523 case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */ 524 525 return (Integer0 + Integer1); 526 527 case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */ 528 529 return (Integer0 & Integer1); 530 531 case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */ 532 533 return (~(Integer0 & Integer1)); 534 535 case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */ 536 537 return (Integer0 | Integer1); 538 539 case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */ 540 541 return (~(Integer0 | Integer1)); 542 543 case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */ 544 545 return (Integer0 ^ Integer1); 546 547 case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */ 548 549 return (Integer0 * Integer1); 550 551 case AML_SHIFT_LEFT_OP: /* ShiftLeft (Operand, ShiftCount, Result)*/ 552 553 /* 554 * We need to check if the shiftcount is larger than the integer bit 555 * width since the behavior of this is not well-defined in the C language. 556 */ 557 if (Integer1 >= AcpiGbl_IntegerBitWidth) 558 { 559 return (0); 560 } 561 return (Integer0 << Integer1); 562 563 case AML_SHIFT_RIGHT_OP: /* ShiftRight (Operand, ShiftCount, Result) */ 564 565 /* 566 * We need to check if the shiftcount is larger than the integer bit 567 * width since the behavior of this is not well-defined in the C language. 568 */ 569 if (Integer1 >= AcpiGbl_IntegerBitWidth) 570 { 571 return (0); 572 } 573 return (Integer0 >> Integer1); 574 575 case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */ 576 577 return (Integer0 - Integer1); 578 579 default: 580 581 return (0); 582 } 583 } 584 585 586 /******************************************************************************* 587 * 588 * FUNCTION: AcpiExDoLogicalNumericOp 589 * 590 * PARAMETERS: Opcode - AML opcode 591 * Integer0 - Integer operand #0 592 * Integer1 - Integer operand #1 593 * LogicalResult - TRUE/FALSE result of the operation 594 * 595 * RETURN: Status 596 * 597 * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric 598 * operators (LAnd and LOr), both operands must be integers. 599 * 600 * Note: cleanest machine code seems to be produced by the code 601 * below, rather than using statements of the form: 602 * Result = (Integer0 && Integer1); 603 * 604 ******************************************************************************/ 605 606 ACPI_STATUS 607 AcpiExDoLogicalNumericOp ( 608 UINT16 Opcode, 609 UINT64 Integer0, 610 UINT64 Integer1, 611 BOOLEAN *LogicalResult) 612 { 613 ACPI_STATUS Status = AE_OK; 614 BOOLEAN LocalResult = FALSE; 615 616 617 ACPI_FUNCTION_TRACE (ExDoLogicalNumericOp); 618 619 620 switch (Opcode) 621 { 622 case AML_LAND_OP: /* LAnd (Integer0, Integer1) */ 623 624 if (Integer0 && Integer1) 625 { 626 LocalResult = TRUE; 627 } 628 break; 629 630 case AML_LOR_OP: /* LOr (Integer0, Integer1) */ 631 632 if (Integer0 || Integer1) 633 { 634 LocalResult = TRUE; 635 } 636 break; 637 638 default: 639 640 Status = AE_AML_INTERNAL; 641 break; 642 } 643 644 /* Return the logical result and status */ 645 646 *LogicalResult = LocalResult; 647 return_ACPI_STATUS (Status); 648 } 649 650 651 /******************************************************************************* 652 * 653 * FUNCTION: AcpiExDoLogicalOp 654 * 655 * PARAMETERS: Opcode - AML opcode 656 * Operand0 - operand #0 657 * Operand1 - operand #1 658 * LogicalResult - TRUE/FALSE result of the operation 659 * 660 * RETURN: Status 661 * 662 * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the 663 * functions here is to prevent a lot of pointer dereferencing 664 * to obtain the operands and to simplify the generation of the 665 * logical value. For the Numeric operators (LAnd and LOr), both 666 * operands must be integers. For the other logical operators, 667 * operands can be any combination of Integer/String/Buffer. The 668 * first operand determines the type to which the second operand 669 * will be converted. 670 * 671 * Note: cleanest machine code seems to be produced by the code 672 * below, rather than using statements of the form: 673 * Result = (Operand0 == Operand1); 674 * 675 ******************************************************************************/ 676 677 ACPI_STATUS 678 AcpiExDoLogicalOp ( 679 UINT16 Opcode, 680 ACPI_OPERAND_OBJECT *Operand0, 681 ACPI_OPERAND_OBJECT *Operand1, 682 BOOLEAN *LogicalResult) 683 { 684 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; 685 UINT64 Integer0; 686 UINT64 Integer1; 687 UINT32 Length0; 688 UINT32 Length1; 689 ACPI_STATUS Status = AE_OK; 690 BOOLEAN LocalResult = FALSE; 691 int Compare; 692 693 694 ACPI_FUNCTION_TRACE (ExDoLogicalOp); 695 696 697 /* 698 * Convert the second operand if necessary. The first operand 699 * determines the type of the second operand, (See the Data Types 700 * section of the ACPI 3.0+ specification.) Both object types are 701 * guaranteed to be either Integer/String/Buffer by the operand 702 * resolution mechanism. 703 */ 704 switch (Operand0->Common.Type) 705 { 706 case ACPI_TYPE_INTEGER: 707 708 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); 709 break; 710 711 case ACPI_TYPE_STRING: 712 713 Status = AcpiExConvertToString (Operand1, &LocalOperand1, 714 ACPI_IMPLICIT_CONVERT_HEX); 715 break; 716 717 case ACPI_TYPE_BUFFER: 718 719 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); 720 break; 721 722 default: 723 724 Status = AE_AML_INTERNAL; 725 break; 726 } 727 728 if (ACPI_FAILURE (Status)) 729 { 730 goto Cleanup; 731 } 732 733 /* 734 * Two cases: 1) Both Integers, 2) Both Strings or Buffers 735 */ 736 if (Operand0->Common.Type == ACPI_TYPE_INTEGER) 737 { 738 /* 739 * 1) Both operands are of type integer 740 * Note: LocalOperand1 may have changed above 741 */ 742 Integer0 = Operand0->Integer.Value; 743 Integer1 = LocalOperand1->Integer.Value; 744 745 switch (Opcode) 746 { 747 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 748 749 if (Integer0 == Integer1) 750 { 751 LocalResult = TRUE; 752 } 753 break; 754 755 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 756 757 if (Integer0 > Integer1) 758 { 759 LocalResult = TRUE; 760 } 761 break; 762 763 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 764 765 if (Integer0 < Integer1) 766 { 767 LocalResult = TRUE; 768 } 769 break; 770 771 default: 772 773 Status = AE_AML_INTERNAL; 774 break; 775 } 776 } 777 else 778 { 779 /* 780 * 2) Both operands are Strings or both are Buffers 781 * Note: Code below takes advantage of common Buffer/String 782 * object fields. LocalOperand1 may have changed above. Use 783 * memcmp to handle nulls in buffers. 784 */ 785 Length0 = Operand0->Buffer.Length; 786 Length1 = LocalOperand1->Buffer.Length; 787 788 /* Lexicographic compare: compare the data bytes */ 789 790 Compare = ACPI_MEMCMP (Operand0->Buffer.Pointer, 791 LocalOperand1->Buffer.Pointer, 792 (Length0 > Length1) ? Length1 : Length0); 793 794 switch (Opcode) 795 { 796 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 797 798 /* Length and all bytes must be equal */ 799 800 if ((Length0 == Length1) && 801 (Compare == 0)) 802 { 803 /* Length and all bytes match ==> TRUE */ 804 805 LocalResult = TRUE; 806 } 807 break; 808 809 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 810 811 if (Compare > 0) 812 { 813 LocalResult = TRUE; 814 goto Cleanup; /* TRUE */ 815 } 816 if (Compare < 0) 817 { 818 goto Cleanup; /* FALSE */ 819 } 820 821 /* Bytes match (to shortest length), compare lengths */ 822 823 if (Length0 > Length1) 824 { 825 LocalResult = TRUE; 826 } 827 break; 828 829 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 830 831 if (Compare > 0) 832 { 833 goto Cleanup; /* FALSE */ 834 } 835 if (Compare < 0) 836 { 837 LocalResult = TRUE; 838 goto Cleanup; /* TRUE */ 839 } 840 841 /* Bytes match (to shortest length), compare lengths */ 842 843 if (Length0 < Length1) 844 { 845 LocalResult = TRUE; 846 } 847 break; 848 849 default: 850 851 Status = AE_AML_INTERNAL; 852 break; 853 } 854 } 855 856 Cleanup: 857 858 /* New object was created if implicit conversion performed - delete */ 859 860 if (LocalOperand1 != Operand1) 861 { 862 AcpiUtRemoveReference (LocalOperand1); 863 } 864 865 /* Return the logical result and status */ 866 867 *LogicalResult = LocalResult; 868 return_ACPI_STATUS (Status); 869 } 870