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 - 2016, 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 #include "acpi.h" 118 #include "accommon.h" 119 #include "acinterp.h" 120 #include "amlcode.h" 121 #include "amlresrc.h" 122 123 124 #define _COMPONENT ACPI_EXECUTER 125 ACPI_MODULE_NAME ("exmisc") 126 127 128 /******************************************************************************* 129 * 130 * FUNCTION: AcpiExGetObjectReference 131 * 132 * PARAMETERS: ObjDesc - Create a reference to this object 133 * ReturnDesc - Where to store the reference 134 * WalkState - Current state 135 * 136 * RETURN: Status 137 * 138 * DESCRIPTION: Obtain and return a "reference" to the target object 139 * Common code for the RefOfOp and the CondRefOfOp. 140 * 141 ******************************************************************************/ 142 143 ACPI_STATUS 144 AcpiExGetObjectReference ( 145 ACPI_OPERAND_OBJECT *ObjDesc, 146 ACPI_OPERAND_OBJECT **ReturnDesc, 147 ACPI_WALK_STATE *WalkState) 148 { 149 ACPI_OPERAND_OBJECT *ReferenceObj; 150 ACPI_OPERAND_OBJECT *ReferencedObj; 151 152 153 ACPI_FUNCTION_TRACE_PTR (ExGetObjectReference, ObjDesc); 154 155 156 *ReturnDesc = NULL; 157 158 switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc)) 159 { 160 case ACPI_DESC_TYPE_OPERAND: 161 162 if (ObjDesc->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) 163 { 164 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 165 } 166 167 /* 168 * Must be a reference to a Local or Arg 169 */ 170 switch (ObjDesc->Reference.Class) 171 { 172 case ACPI_REFCLASS_LOCAL: 173 case ACPI_REFCLASS_ARG: 174 case ACPI_REFCLASS_DEBUG: 175 176 /* The referenced object is the pseudo-node for the local/arg */ 177 178 ReferencedObj = ObjDesc->Reference.Object; 179 break; 180 181 default: 182 183 ACPI_ERROR ((AE_INFO, "Invalid Reference Class 0x%2.2X", 184 ObjDesc->Reference.Class)); 185 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 186 } 187 break; 188 189 case ACPI_DESC_TYPE_NAMED: 190 /* 191 * A named reference that has already been resolved to a Node 192 */ 193 ReferencedObj = ObjDesc; 194 break; 195 196 default: 197 198 ACPI_ERROR ((AE_INFO, "Invalid descriptor type 0x%X", 199 ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))); 200 return_ACPI_STATUS (AE_TYPE); 201 } 202 203 204 /* Create a new reference object */ 205 206 ReferenceObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE); 207 if (!ReferenceObj) 208 { 209 return_ACPI_STATUS (AE_NO_MEMORY); 210 } 211 212 ReferenceObj->Reference.Class = ACPI_REFCLASS_REFOF; 213 ReferenceObj->Reference.Object = ReferencedObj; 214 *ReturnDesc = ReferenceObj; 215 216 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 217 "Object %p Type [%s], returning Reference %p\n", 218 ObjDesc, AcpiUtGetObjectTypeName (ObjDesc), *ReturnDesc)); 219 220 return_ACPI_STATUS (AE_OK); 221 } 222 223 224 /******************************************************************************* 225 * 226 * FUNCTION: AcpiExConcatTemplate 227 * 228 * PARAMETERS: Operand0 - First source object 229 * Operand1 - Second source object 230 * ActualReturnDesc - Where to place the return object 231 * WalkState - Current walk state 232 * 233 * RETURN: Status 234 * 235 * DESCRIPTION: Concatenate two resource templates 236 * 237 ******************************************************************************/ 238 239 ACPI_STATUS 240 AcpiExConcatTemplate ( 241 ACPI_OPERAND_OBJECT *Operand0, 242 ACPI_OPERAND_OBJECT *Operand1, 243 ACPI_OPERAND_OBJECT **ActualReturnDesc, 244 ACPI_WALK_STATE *WalkState) 245 { 246 ACPI_STATUS Status; 247 ACPI_OPERAND_OBJECT *ReturnDesc; 248 UINT8 *NewBuf; 249 UINT8 *EndTag; 250 ACPI_SIZE Length0; 251 ACPI_SIZE Length1; 252 ACPI_SIZE NewLength; 253 254 255 ACPI_FUNCTION_TRACE (ExConcatTemplate); 256 257 258 /* 259 * Find the EndTag descriptor in each resource template. 260 * Note1: returned pointers point TO the EndTag, not past it. 261 * Note2: zero-length buffers are allowed; treated like one EndTag 262 */ 263 264 /* Get the length of the first resource template */ 265 266 Status = AcpiUtGetResourceEndTag (Operand0, &EndTag); 267 if (ACPI_FAILURE (Status)) 268 { 269 return_ACPI_STATUS (Status); 270 } 271 272 Length0 = ACPI_PTR_DIFF (EndTag, Operand0->Buffer.Pointer); 273 274 /* Get the length of the second resource template */ 275 276 Status = AcpiUtGetResourceEndTag (Operand1, &EndTag); 277 if (ACPI_FAILURE (Status)) 278 { 279 return_ACPI_STATUS (Status); 280 } 281 282 Length1 = ACPI_PTR_DIFF (EndTag, Operand1->Buffer.Pointer); 283 284 /* Combine both lengths, minimum size will be 2 for EndTag */ 285 286 NewLength = Length0 + Length1 + sizeof (AML_RESOURCE_END_TAG); 287 288 /* Create a new buffer object for the result (with one EndTag) */ 289 290 ReturnDesc = AcpiUtCreateBufferObject (NewLength); 291 if (!ReturnDesc) 292 { 293 return_ACPI_STATUS (AE_NO_MEMORY); 294 } 295 296 /* 297 * Copy the templates to the new buffer, 0 first, then 1 follows. One 298 * EndTag descriptor is copied from Operand1. 299 */ 300 NewBuf = ReturnDesc->Buffer.Pointer; 301 memcpy (NewBuf, Operand0->Buffer.Pointer, Length0); 302 memcpy (NewBuf + Length0, Operand1->Buffer.Pointer, Length1); 303 304 /* Insert EndTag and set the checksum to zero, means "ignore checksum" */ 305 306 NewBuf[NewLength - 1] = 0; 307 NewBuf[NewLength - 2] = ACPI_RESOURCE_NAME_END_TAG | 1; 308 309 /* Return the completed resource template */ 310 311 *ActualReturnDesc = ReturnDesc; 312 return_ACPI_STATUS (AE_OK); 313 } 314 315 316 /******************************************************************************* 317 * 318 * FUNCTION: AcpiExDoConcatenate 319 * 320 * PARAMETERS: Operand0 - First source object 321 * Operand1 - Second source object 322 * ActualReturnDesc - Where to place the return object 323 * WalkState - Current walk state 324 * 325 * RETURN: Status 326 * 327 * DESCRIPTION: Concatenate two objects OF THE SAME TYPE. 328 * 329 ******************************************************************************/ 330 331 ACPI_STATUS 332 AcpiExDoConcatenate ( 333 ACPI_OPERAND_OBJECT *Operand0, 334 ACPI_OPERAND_OBJECT *Operand1, 335 ACPI_OPERAND_OBJECT **ActualReturnDesc, 336 ACPI_WALK_STATE *WalkState) 337 { 338 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; 339 ACPI_OPERAND_OBJECT *ReturnDesc; 340 char *NewBuf; 341 const char *TypeString; 342 ACPI_STATUS Status; 343 344 345 ACPI_FUNCTION_TRACE (ExDoConcatenate); 346 347 348 /* 349 * Convert the second operand if necessary. The first operand 350 * determines the type of the second operand, (See the Data Types 351 * section of the ACPI specification.) Both object types are 352 * guaranteed to be either Integer/String/Buffer by the operand 353 * resolution mechanism. 354 */ 355 switch (Operand0->Common.Type) 356 { 357 case ACPI_TYPE_INTEGER: 358 359 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); 360 break; 361 362 case ACPI_TYPE_STRING: 363 /* 364 * Per the ACPI spec, Concatenate only supports int/str/buf. 365 * However, we support all objects here as an extension. 366 * This improves the usefulness of the Printf() macro. 367 * 12/2015. 368 */ 369 switch (Operand1->Common.Type) 370 { 371 case ACPI_TYPE_INTEGER: 372 case ACPI_TYPE_STRING: 373 case ACPI_TYPE_BUFFER: 374 375 Status = AcpiExConvertToString ( 376 Operand1, &LocalOperand1, ACPI_IMPLICIT_CONVERT_HEX); 377 break; 378 379 default: 380 /* 381 * Just emit a string containing the object type. 382 */ 383 TypeString = AcpiUtGetTypeName (Operand1->Common.Type); 384 385 LocalOperand1 = AcpiUtCreateStringObject ( 386 ((ACPI_SIZE) strlen (TypeString) + 9)); /* 9 For "[Object]" */ 387 if (!LocalOperand1) 388 { 389 Status = AE_NO_MEMORY; 390 goto Cleanup; 391 } 392 393 strcpy (LocalOperand1->String.Pointer, "["); 394 strcat (LocalOperand1->String.Pointer, TypeString); 395 strcat (LocalOperand1->String.Pointer, " Object]"); 396 Status = AE_OK; 397 break; 398 } 399 break; 400 401 case ACPI_TYPE_BUFFER: 402 403 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); 404 break; 405 406 default: 407 408 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X", 409 Operand0->Common.Type)); 410 Status = AE_AML_INTERNAL; 411 } 412 413 if (ACPI_FAILURE (Status)) 414 { 415 goto Cleanup; 416 } 417 418 /* 419 * Both operands are now known to be the same object type 420 * (Both are Integer, String, or Buffer), and we can now perform the 421 * concatenation. 422 */ 423 424 /* 425 * There are three cases to handle: 426 * 427 * 1) Two Integers concatenated to produce a new Buffer 428 * 2) Two Strings concatenated to produce a new String 429 * 3) Two Buffers concatenated to produce a new Buffer 430 */ 431 switch (Operand0->Common.Type) 432 { 433 case ACPI_TYPE_INTEGER: 434 435 /* Result of two Integers is a Buffer */ 436 /* Need enough buffer space for two integers */ 437 438 ReturnDesc = AcpiUtCreateBufferObject ( 439 (ACPI_SIZE) ACPI_MUL_2 (AcpiGbl_IntegerByteWidth)); 440 if (!ReturnDesc) 441 { 442 Status = AE_NO_MEMORY; 443 goto Cleanup; 444 } 445 446 NewBuf = (char *) ReturnDesc->Buffer.Pointer; 447 448 /* Copy the first integer, LSB first */ 449 450 memcpy (NewBuf, &Operand0->Integer.Value, 451 AcpiGbl_IntegerByteWidth); 452 453 /* Copy the second integer (LSB first) after the first */ 454 455 memcpy (NewBuf + AcpiGbl_IntegerByteWidth, 456 &LocalOperand1->Integer.Value, AcpiGbl_IntegerByteWidth); 457 break; 458 459 case ACPI_TYPE_STRING: 460 461 /* Result of two Strings is a String */ 462 463 ReturnDesc = AcpiUtCreateStringObject ( 464 ((ACPI_SIZE) Operand0->String.Length + 465 LocalOperand1->String.Length)); 466 if (!ReturnDesc) 467 { 468 Status = AE_NO_MEMORY; 469 goto Cleanup; 470 } 471 472 NewBuf = ReturnDesc->String.Pointer; 473 474 /* Concatenate the strings */ 475 476 strcpy (NewBuf, Operand0->String.Pointer); 477 strcat (NewBuf, LocalOperand1->String.Pointer); 478 break; 479 480 case ACPI_TYPE_BUFFER: 481 482 /* Result of two Buffers is a Buffer */ 483 484 ReturnDesc = AcpiUtCreateBufferObject ( 485 ((ACPI_SIZE) Operand0->Buffer.Length + 486 LocalOperand1->Buffer.Length)); 487 if (!ReturnDesc) 488 { 489 Status = AE_NO_MEMORY; 490 goto Cleanup; 491 } 492 493 NewBuf = (char *) ReturnDesc->Buffer.Pointer; 494 495 /* Concatenate the buffers */ 496 497 memcpy (NewBuf, Operand0->Buffer.Pointer, 498 Operand0->Buffer.Length); 499 memcpy (NewBuf + Operand0->Buffer.Length, 500 LocalOperand1->Buffer.Pointer, 501 LocalOperand1->Buffer.Length); 502 break; 503 504 default: 505 506 /* Invalid object type, should not happen here */ 507 508 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X", 509 Operand0->Common.Type)); 510 Status =AE_AML_INTERNAL; 511 goto Cleanup; 512 } 513 514 *ActualReturnDesc = ReturnDesc; 515 516 Cleanup: 517 if (LocalOperand1 != Operand1) 518 { 519 AcpiUtRemoveReference (LocalOperand1); 520 } 521 return_ACPI_STATUS (Status); 522 } 523 524 525 /******************************************************************************* 526 * 527 * FUNCTION: AcpiExDoMathOp 528 * 529 * PARAMETERS: Opcode - AML opcode 530 * Integer0 - Integer operand #0 531 * Integer1 - Integer operand #1 532 * 533 * RETURN: Integer result of the operation 534 * 535 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the 536 * math functions here is to prevent a lot of pointer dereferencing 537 * to obtain the operands. 538 * 539 ******************************************************************************/ 540 541 UINT64 542 AcpiExDoMathOp ( 543 UINT16 Opcode, 544 UINT64 Integer0, 545 UINT64 Integer1) 546 { 547 548 ACPI_FUNCTION_ENTRY (); 549 550 551 switch (Opcode) 552 { 553 case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */ 554 555 return (Integer0 + Integer1); 556 557 case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */ 558 559 return (Integer0 & Integer1); 560 561 case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */ 562 563 return (~(Integer0 & Integer1)); 564 565 case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */ 566 567 return (Integer0 | Integer1); 568 569 case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */ 570 571 return (~(Integer0 | Integer1)); 572 573 case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */ 574 575 return (Integer0 ^ Integer1); 576 577 case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */ 578 579 return (Integer0 * Integer1); 580 581 case AML_SHIFT_LEFT_OP: /* ShiftLeft (Operand, ShiftCount, Result)*/ 582 583 /* 584 * We need to check if the shiftcount is larger than the integer bit 585 * width since the behavior of this is not well-defined in the C language. 586 */ 587 if (Integer1 >= AcpiGbl_IntegerBitWidth) 588 { 589 return (0); 590 } 591 return (Integer0 << Integer1); 592 593 case AML_SHIFT_RIGHT_OP: /* ShiftRight (Operand, ShiftCount, Result) */ 594 595 /* 596 * We need to check if the shiftcount is larger than the integer bit 597 * width since the behavior of this is not well-defined in the C language. 598 */ 599 if (Integer1 >= AcpiGbl_IntegerBitWidth) 600 { 601 return (0); 602 } 603 return (Integer0 >> Integer1); 604 605 case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */ 606 607 return (Integer0 - Integer1); 608 609 default: 610 611 return (0); 612 } 613 } 614 615 616 /******************************************************************************* 617 * 618 * FUNCTION: AcpiExDoLogicalNumericOp 619 * 620 * PARAMETERS: Opcode - AML opcode 621 * Integer0 - Integer operand #0 622 * Integer1 - Integer operand #1 623 * LogicalResult - TRUE/FALSE result of the operation 624 * 625 * RETURN: Status 626 * 627 * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric 628 * operators (LAnd and LOr), both operands must be integers. 629 * 630 * Note: cleanest machine code seems to be produced by the code 631 * below, rather than using statements of the form: 632 * Result = (Integer0 && Integer1); 633 * 634 ******************************************************************************/ 635 636 ACPI_STATUS 637 AcpiExDoLogicalNumericOp ( 638 UINT16 Opcode, 639 UINT64 Integer0, 640 UINT64 Integer1, 641 BOOLEAN *LogicalResult) 642 { 643 ACPI_STATUS Status = AE_OK; 644 BOOLEAN LocalResult = FALSE; 645 646 647 ACPI_FUNCTION_TRACE (ExDoLogicalNumericOp); 648 649 650 switch (Opcode) 651 { 652 case AML_LAND_OP: /* LAnd (Integer0, Integer1) */ 653 654 if (Integer0 && Integer1) 655 { 656 LocalResult = TRUE; 657 } 658 break; 659 660 case AML_LOR_OP: /* LOr (Integer0, Integer1) */ 661 662 if (Integer0 || Integer1) 663 { 664 LocalResult = TRUE; 665 } 666 break; 667 668 default: 669 670 Status = AE_AML_INTERNAL; 671 break; 672 } 673 674 /* Return the logical result and status */ 675 676 *LogicalResult = LocalResult; 677 return_ACPI_STATUS (Status); 678 } 679 680 681 /******************************************************************************* 682 * 683 * FUNCTION: AcpiExDoLogicalOp 684 * 685 * PARAMETERS: Opcode - AML opcode 686 * Operand0 - operand #0 687 * Operand1 - operand #1 688 * LogicalResult - TRUE/FALSE result of the operation 689 * 690 * RETURN: Status 691 * 692 * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the 693 * functions here is to prevent a lot of pointer dereferencing 694 * to obtain the operands and to simplify the generation of the 695 * logical value. For the Numeric operators (LAnd and LOr), both 696 * operands must be integers. For the other logical operators, 697 * operands can be any combination of Integer/String/Buffer. The 698 * first operand determines the type to which the second operand 699 * will be converted. 700 * 701 * Note: cleanest machine code seems to be produced by the code 702 * below, rather than using statements of the form: 703 * Result = (Operand0 == Operand1); 704 * 705 ******************************************************************************/ 706 707 ACPI_STATUS 708 AcpiExDoLogicalOp ( 709 UINT16 Opcode, 710 ACPI_OPERAND_OBJECT *Operand0, 711 ACPI_OPERAND_OBJECT *Operand1, 712 BOOLEAN *LogicalResult) 713 { 714 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; 715 UINT64 Integer0; 716 UINT64 Integer1; 717 UINT32 Length0; 718 UINT32 Length1; 719 ACPI_STATUS Status = AE_OK; 720 BOOLEAN LocalResult = FALSE; 721 int Compare; 722 723 724 ACPI_FUNCTION_TRACE (ExDoLogicalOp); 725 726 727 /* 728 * Convert the second operand if necessary. The first operand 729 * determines the type of the second operand, (See the Data Types 730 * section of the ACPI 3.0+ specification.) Both object types are 731 * guaranteed to be either Integer/String/Buffer by the operand 732 * resolution mechanism. 733 */ 734 switch (Operand0->Common.Type) 735 { 736 case ACPI_TYPE_INTEGER: 737 738 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); 739 break; 740 741 case ACPI_TYPE_STRING: 742 743 Status = AcpiExConvertToString ( 744 Operand1, &LocalOperand1, ACPI_IMPLICIT_CONVERT_HEX); 745 break; 746 747 case ACPI_TYPE_BUFFER: 748 749 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); 750 break; 751 752 default: 753 754 Status = AE_AML_INTERNAL; 755 break; 756 } 757 758 if (ACPI_FAILURE (Status)) 759 { 760 goto Cleanup; 761 } 762 763 /* 764 * Two cases: 1) Both Integers, 2) Both Strings or Buffers 765 */ 766 if (Operand0->Common.Type == ACPI_TYPE_INTEGER) 767 { 768 /* 769 * 1) Both operands are of type integer 770 * Note: LocalOperand1 may have changed above 771 */ 772 Integer0 = Operand0->Integer.Value; 773 Integer1 = LocalOperand1->Integer.Value; 774 775 switch (Opcode) 776 { 777 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 778 779 if (Integer0 == Integer1) 780 { 781 LocalResult = TRUE; 782 } 783 break; 784 785 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 786 787 if (Integer0 > Integer1) 788 { 789 LocalResult = TRUE; 790 } 791 break; 792 793 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 794 795 if (Integer0 < Integer1) 796 { 797 LocalResult = TRUE; 798 } 799 break; 800 801 default: 802 803 Status = AE_AML_INTERNAL; 804 break; 805 } 806 } 807 else 808 { 809 /* 810 * 2) Both operands are Strings or both are Buffers 811 * Note: Code below takes advantage of common Buffer/String 812 * object fields. LocalOperand1 may have changed above. Use 813 * memcmp to handle nulls in buffers. 814 */ 815 Length0 = Operand0->Buffer.Length; 816 Length1 = LocalOperand1->Buffer.Length; 817 818 /* Lexicographic compare: compare the data bytes */ 819 820 Compare = memcmp (Operand0->Buffer.Pointer, 821 LocalOperand1->Buffer.Pointer, 822 (Length0 > Length1) ? Length1 : Length0); 823 824 switch (Opcode) 825 { 826 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ 827 828 /* Length and all bytes must be equal */ 829 830 if ((Length0 == Length1) && 831 (Compare == 0)) 832 { 833 /* Length and all bytes match ==> TRUE */ 834 835 LocalResult = TRUE; 836 } 837 break; 838 839 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ 840 841 if (Compare > 0) 842 { 843 LocalResult = TRUE; 844 goto Cleanup; /* TRUE */ 845 } 846 if (Compare < 0) 847 { 848 goto Cleanup; /* FALSE */ 849 } 850 851 /* Bytes match (to shortest length), compare lengths */ 852 853 if (Length0 > Length1) 854 { 855 LocalResult = TRUE; 856 } 857 break; 858 859 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ 860 861 if (Compare > 0) 862 { 863 goto Cleanup; /* FALSE */ 864 } 865 if (Compare < 0) 866 { 867 LocalResult = TRUE; 868 goto Cleanup; /* TRUE */ 869 } 870 871 /* Bytes match (to shortest length), compare lengths */ 872 873 if (Length0 < Length1) 874 { 875 LocalResult = TRUE; 876 } 877 break; 878 879 default: 880 881 Status = AE_AML_INTERNAL; 882 break; 883 } 884 } 885 886 Cleanup: 887 888 /* New object was created if implicit conversion performed - delete */ 889 890 if (LocalOperand1 != Operand1) 891 { 892 AcpiUtRemoveReference (LocalOperand1); 893 } 894 895 /* Return the logical result and status */ 896 897 *LogicalResult = LocalResult; 898 return_ACPI_STATUS (Status); 899 } 900