1 /****************************************************************************** 2 * 3 * Module Name: dtutils.c - Utility routines for the data table compiler 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2023, 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 MERCHANTABILITY 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 "aslcompiler.h" 45 #include "actables.h" 46 47 #define _COMPONENT DT_COMPILER 48 ACPI_MODULE_NAME ("dtutils") 49 50 /* Local prototypes */ 51 52 static void 53 DtSum ( 54 DT_SUBTABLE *Subtable, 55 void *Context, 56 void *ReturnValue); 57 58 59 /****************************************************************************** 60 * 61 * FUNCTION: DtError 62 * 63 * PARAMETERS: Level - Seriousness (Warning/error, etc.) 64 * MessageId - Index into global message buffer 65 * Op - Parse node where error happened 66 * ExtraMessage - additional error message 67 * 68 * RETURN: None 69 * 70 * DESCRIPTION: Common error interface for data table compiler 71 * 72 *****************************************************************************/ 73 74 void 75 DtError ( 76 UINT8 Level, 77 UINT16 MessageId, 78 DT_FIELD *FieldObject, 79 char *ExtraMessage) 80 { 81 UINT32 Line = 0; 82 83 84 /* Field object could be NULL */ 85 86 if (FieldObject) 87 { 88 Line = FieldObject->Line; 89 } 90 91 /* Check if user wants to ignore this exception */ 92 93 if (AslIsExceptionIgnored (AslGbl_Files[ASL_FILE_INPUT].Filename, 94 Line, Level, MessageId)) 95 { 96 return; 97 } 98 99 if (FieldObject) 100 { 101 AslCommonError (Level, MessageId, 102 FieldObject->Line, 103 FieldObject->Line, 104 FieldObject->ByteOffset, 105 FieldObject->Column, 106 AslGbl_Files[ASL_FILE_INPUT].Filename, ExtraMessage); 107 } 108 else 109 { 110 AslCommonError (Level, MessageId, 0, 111 0, 0, 0, 0, ExtraMessage); 112 } 113 } 114 115 116 /****************************************************************************** 117 * 118 * FUNCTION: DtNameError 119 * 120 * PARAMETERS: Level - Seriousness (Warning/error, etc.) 121 * MessageId - Index into global message buffer 122 * Op - Parse node where error happened 123 * ExtraMessage - additional error message 124 * 125 * RETURN: None 126 * 127 * DESCRIPTION: Error interface for named objects 128 * 129 *****************************************************************************/ 130 131 void 132 DtNameError ( 133 UINT8 Level, 134 UINT16 MessageId, 135 DT_FIELD *FieldObject, 136 char *ExtraMessage) 137 { 138 139 switch (Level) 140 { 141 case ASL_WARNING2: 142 case ASL_WARNING3: 143 144 if (AslGbl_WarningLevel < Level) 145 { 146 return; 147 } 148 break; 149 150 default: 151 152 break; 153 } 154 155 if (FieldObject) 156 { 157 AslCommonError (Level, MessageId, 158 FieldObject->Line, 159 FieldObject->Line, 160 FieldObject->ByteOffset, 161 FieldObject->NameColumn, 162 AslGbl_Files[ASL_FILE_INPUT].Filename, ExtraMessage); 163 } 164 else 165 { 166 AslCommonError (Level, MessageId, 0, 167 0, 0, 0, 0, ExtraMessage); 168 } 169 } 170 171 172 /******************************************************************************* 173 * 174 * FUNCTION: DtFatal 175 * 176 * PARAMETERS: None 177 * 178 * RETURN: None 179 * 180 * DESCRIPTION: Dump the error log and abort the compiler. Used for serious 181 * compile or I/O errors 182 * 183 ******************************************************************************/ 184 185 void 186 DtFatal ( 187 UINT16 MessageId, 188 DT_FIELD *FieldObject, 189 char *ExtraMessage) 190 { 191 192 DtError (ASL_ERROR, MessageId, FieldObject, ExtraMessage); 193 194 /* 195 * TBD: remove this entire function, DtFatal 196 * 197 * We cannot abort the compiler on error, because we may be compiling a 198 * list of files. We must move on to the next file. 199 */ 200 #ifdef __OBSOLETE 201 CmCleanupAndExit (); 202 exit (1); 203 #endif 204 } 205 206 207 /******************************************************************************* 208 * 209 * FUNCTION: DtDoConstant 210 * 211 * PARAMETERS: String - Only hex constants are supported, 212 * regardless of whether the 0x prefix 213 * is used 214 * 215 * RETURN: Converted Integer 216 * 217 * DESCRIPTION: Convert a string to an integer, with overflow/error checking. 218 * 219 ******************************************************************************/ 220 221 UINT64 222 DtDoConstant ( 223 char *String) 224 { 225 UINT64 ConvertedInteger; 226 227 228 /* 229 * TBD: The ImplicitStrtoul64 function does not report overflow 230 * conditions. The input string is simply truncated. If it is 231 * desired to report overflow to the table compiler, this should 232 * somehow be added here. Note: integers that are prefixed with 0x 233 * or not are both hex integers. 234 */ 235 ConvertedInteger = AcpiUtImplicitStrtoul64 (String); 236 return (ConvertedInteger); 237 } 238 239 /****************************************************************************** 240 * 241 * FUNCTION: DtGetFieldValue 242 * 243 * PARAMETERS: Field - Current field list pointer 244 * 245 * RETURN: Field value 246 * 247 * DESCRIPTION: Get field value 248 * 249 *****************************************************************************/ 250 251 char * 252 DtGetFieldValue ( 253 DT_FIELD *Field) 254 { 255 if (!Field) 256 { 257 return (NULL); 258 } 259 260 return (Field->Value); 261 } 262 263 264 /****************************************************************************** 265 * 266 * FUNCTION: DtGetFieldType 267 * 268 * PARAMETERS: Info - Data table info 269 * 270 * RETURN: Field type 271 * 272 * DESCRIPTION: Get field type 273 * 274 *****************************************************************************/ 275 276 UINT8 277 DtGetFieldType ( 278 ACPI_DMTABLE_INFO *Info) 279 { 280 UINT8 Type; 281 282 283 /* DT_FLAG means that this is the start of a block of flag bits */ 284 /* TBD - we can make these a separate opcode later */ 285 286 if (Info->Flags & DT_FLAG) 287 { 288 return (DT_FIELD_TYPE_FLAGS_INTEGER); 289 } 290 291 /* Type is based upon the opcode for this field in the info table */ 292 293 switch (Info->Opcode) 294 { 295 case ACPI_DMT_FLAG0: 296 case ACPI_DMT_FLAG1: 297 case ACPI_DMT_FLAG2: 298 case ACPI_DMT_FLAG3: 299 case ACPI_DMT_FLAG4: 300 case ACPI_DMT_FLAG5: 301 case ACPI_DMT_FLAG6: 302 case ACPI_DMT_FLAG7: 303 case ACPI_DMT_FLAGS0: 304 case ACPI_DMT_FLAGS1: 305 case ACPI_DMT_FLAGS2: 306 case ACPI_DMT_FLAGS8_2: 307 case ACPI_DMT_FLAGS4: 308 case ACPI_DMT_FLAGS4_0: 309 case ACPI_DMT_FLAGS4_4: 310 case ACPI_DMT_FLAGS4_8: 311 case ACPI_DMT_FLAGS4_12: 312 case ACPI_DMT_FLAGS16_16: 313 314 Type = DT_FIELD_TYPE_FLAG; 315 break; 316 317 case ACPI_DMT_NAME4: 318 case ACPI_DMT_SIG: 319 case ACPI_DMT_NAME6: 320 case ACPI_DMT_NAME8: 321 case ACPI_DMT_STRING: 322 case ACPI_DMT_IVRS_UNTERMINATED_STRING: 323 324 Type = DT_FIELD_TYPE_STRING; 325 break; 326 327 case ACPI_DMT_BUFFER: 328 case ACPI_DMT_RAW_BUFFER: 329 case ACPI_DMT_BUF7: 330 case ACPI_DMT_BUF10: 331 case ACPI_DMT_BUF12: 332 case ACPI_DMT_BUF16: 333 case ACPI_DMT_BUF18: 334 case ACPI_DMT_BUF32: 335 case ACPI_DMT_BUF112: 336 case ACPI_DMT_BUF128: 337 case ACPI_DMT_PCI_PATH: 338 case ACPI_DMT_PMTT_VENDOR: 339 340 Type = DT_FIELD_TYPE_BUFFER; 341 break; 342 343 case ACPI_DMT_GAS: 344 case ACPI_DMT_HESTNTFY: 345 case ACPI_DMT_IORTMEM: 346 347 Type = DT_FIELD_TYPE_INLINE_SUBTABLE; 348 break; 349 350 case ACPI_DMT_UNICODE: 351 case ACPI_DMT_WPBT_UNICODE: 352 353 Type = DT_FIELD_TYPE_UNICODE; 354 break; 355 356 case ACPI_DMT_UUID: 357 358 Type = DT_FIELD_TYPE_UUID; 359 break; 360 361 case ACPI_DMT_DEVICE_PATH: 362 363 Type = DT_FIELD_TYPE_DEVICE_PATH; 364 break; 365 366 case ACPI_DMT_LABEL: 367 368 Type = DT_FIELD_TYPE_LABEL; 369 break; 370 371 default: 372 373 Type = DT_FIELD_TYPE_INTEGER; 374 break; 375 } 376 377 return (Type); 378 } 379 380 381 /****************************************************************************** 382 * 383 * FUNCTION: DtGetBufferLength 384 * 385 * PARAMETERS: Buffer - List of integers, 386 * for example "10 3A 4F 2E" 387 * 388 * RETURN: Count of integer 389 * 390 * DESCRIPTION: Get length of bytes needed to store the integers 391 * 392 *****************************************************************************/ 393 394 UINT32 395 DtGetBufferLength ( 396 char *Buffer) 397 { 398 UINT32 ByteLength = 0; 399 400 401 while (*Buffer) 402 { 403 if (*Buffer == ' ') 404 { 405 ByteLength++; 406 407 while (*Buffer == ' ') 408 { 409 Buffer++; 410 } 411 } 412 413 Buffer++; 414 } 415 416 return (++ByteLength); 417 } 418 419 420 /****************************************************************************** 421 * 422 * FUNCTION: DtGetFieldLength 423 * 424 * PARAMETERS: Field - Current field 425 * Info - Data table info 426 * 427 * RETURN: Field length 428 * 429 * DESCRIPTION: Get length of bytes needed to compile the field 430 * 431 * Note: This function must remain in sync with AcpiDmDumpTable. 432 * 433 *****************************************************************************/ 434 435 UINT32 436 DtGetFieldLength ( 437 DT_FIELD *Field, 438 ACPI_DMTABLE_INFO *Info) 439 { 440 UINT32 ByteLength = 0; 441 char *Value; 442 443 444 /* Length is based upon the opcode for this field in the info table */ 445 446 switch (Info->Opcode) 447 { 448 case ACPI_DMT_FLAG0: 449 case ACPI_DMT_FLAG1: 450 case ACPI_DMT_FLAG2: 451 case ACPI_DMT_FLAG3: 452 case ACPI_DMT_FLAG4: 453 case ACPI_DMT_FLAG5: 454 case ACPI_DMT_FLAG6: 455 case ACPI_DMT_FLAG7: 456 case ACPI_DMT_FLAGS0: 457 case ACPI_DMT_FLAGS1: 458 case ACPI_DMT_FLAGS2: 459 case ACPI_DMT_FLAGS8_2: 460 case ACPI_DMT_FLAGS4: 461 case ACPI_DMT_FLAGS4_0: 462 case ACPI_DMT_FLAGS4_4: 463 case ACPI_DMT_FLAGS4_8: 464 case ACPI_DMT_FLAGS4_12: 465 case ACPI_DMT_FLAGS16_16: 466 case ACPI_DMT_LABEL: 467 case ACPI_DMT_EXTRA_TEXT: 468 469 ByteLength = 0; 470 break; 471 472 case ACPI_DMT_UINT8: 473 case ACPI_DMT_CHKSUM: 474 case ACPI_DMT_SPACEID: 475 case ACPI_DMT_ACCWIDTH: 476 case ACPI_DMT_CEDT: 477 case ACPI_DMT_IVRS: 478 case ACPI_DMT_IVRS_DE: 479 case ACPI_DMT_GTDT: 480 case ACPI_DMT_MADT: 481 case ACPI_DMT_MPAM_LOCATOR: 482 case ACPI_DMT_PCCT: 483 case ACPI_DMT_PMTT: 484 case ACPI_DMT_PPTT: 485 case ACPI_DMT_RGRT: 486 case ACPI_DMT_SDEV: 487 case ACPI_DMT_SRAT: 488 case ACPI_DMT_AEST: 489 case ACPI_DMT_AEST_RES: 490 case ACPI_DMT_AEST_XFACE: 491 case ACPI_DMT_AEST_XRUPT: 492 case ACPI_DMT_ASF: 493 case ACPI_DMT_CDAT: 494 case ACPI_DMT_HESTNTYP: 495 case ACPI_DMT_FADTPM: 496 case ACPI_DMT_EINJACT: 497 case ACPI_DMT_EINJINST: 498 case ACPI_DMT_ERSTACT: 499 case ACPI_DMT_ERSTINST: 500 case ACPI_DMT_DMAR_SCOPE: 501 case ACPI_DMT_VIOT: 502 503 ByteLength = 1; 504 break; 505 506 case ACPI_DMT_ASPT: 507 case ACPI_DMT_UINT16: 508 case ACPI_DMT_DMAR: 509 case ACPI_DMT_HEST: 510 case ACPI_DMT_HMAT: 511 case ACPI_DMT_NFIT: 512 case ACPI_DMT_PCI_PATH: 513 case ACPI_DMT_PHAT: 514 515 ByteLength = 2; 516 break; 517 518 case ACPI_DMT_UINT24: 519 520 ByteLength = 3; 521 break; 522 523 case ACPI_DMT_UINT32: 524 case ACPI_DMT_AEST_CACHE: 525 case ACPI_DMT_AEST_GIC: 526 case ACPI_DMT_NAME4: 527 case ACPI_DMT_SIG: 528 case ACPI_DMT_LPIT: 529 case ACPI_DMT_TPM2: 530 531 ByteLength = 4; 532 break; 533 534 case ACPI_DMT_UINT40: 535 536 ByteLength = 5; 537 break; 538 539 case ACPI_DMT_UINT48: 540 case ACPI_DMT_NAME6: 541 542 ByteLength = 6; 543 break; 544 545 case ACPI_DMT_UINT56: 546 case ACPI_DMT_BUF7: 547 548 ByteLength = 7; 549 break; 550 551 case ACPI_DMT_UINT64: 552 case ACPI_DMT_NAME8: 553 554 ByteLength = 8; 555 break; 556 557 case ACPI_DMT_STRING: 558 559 Value = DtGetFieldValue (Field); 560 if (Value) 561 { 562 ByteLength = strlen (Value) + 1; 563 } 564 else 565 { /* At this point, this is a fatal error */ 566 567 snprintf (AslGbl_MsgBuffer, sizeof(AslGbl_MsgBuffer), "Expected \"%s\"", Info->Name); 568 DtFatal (ASL_MSG_COMPILER_INTERNAL, NULL, AslGbl_MsgBuffer); 569 return (0); 570 } 571 break; 572 573 case ACPI_DMT_IVRS_UNTERMINATED_STRING: 574 575 Value = DtGetFieldValue (Field); 576 if (Value) 577 { 578 ByteLength = strlen (Value); 579 } 580 else 581 { /* At this point, this is a fatal error */ 582 583 snprintf (AslGbl_MsgBuffer, sizeof(AslGbl_MsgBuffer), "Expected \"%s\"", Info->Name); 584 DtFatal (ASL_MSG_COMPILER_INTERNAL, NULL, AslGbl_MsgBuffer); 585 return (0); 586 } 587 break; 588 589 case ACPI_DMT_GAS: 590 591 ByteLength = sizeof (ACPI_GENERIC_ADDRESS); 592 break; 593 594 case ACPI_DMT_HESTNTFY: 595 596 ByteLength = sizeof (ACPI_HEST_NOTIFY); 597 break; 598 599 case ACPI_DMT_IORTMEM: 600 601 ByteLength = sizeof (ACPI_IORT_MEMORY_ACCESS); 602 break; 603 604 case ACPI_DMT_BUFFER: 605 case ACPI_DMT_RAW_BUFFER: 606 case ACPI_DMT_PMTT_VENDOR: 607 608 Value = DtGetFieldValue (Field); 609 if (Value) 610 { 611 ByteLength = DtGetBufferLength (Value); 612 } 613 else 614 { /* At this point, this is a fatal error */ 615 616 snprintf (AslGbl_MsgBuffer, sizeof(AslGbl_MsgBuffer), "Expected \"%s\"", Info->Name); 617 DtFatal (ASL_MSG_COMPILER_INTERNAL, NULL, AslGbl_MsgBuffer); 618 return (0); 619 } 620 break; 621 622 case ACPI_DMT_BUF10: 623 624 ByteLength = 10; 625 break; 626 627 case ACPI_DMT_BUF12: 628 629 ByteLength = 12; 630 break; 631 632 case ACPI_DMT_BUF16: 633 case ACPI_DMT_UUID: 634 635 ByteLength = 16; 636 break; 637 638 case ACPI_DMT_BUF18: 639 640 ByteLength = 18; 641 break; 642 643 case ACPI_DMT_BUF32: 644 645 ByteLength = 32; 646 break; 647 648 case ACPI_DMT_BUF112: 649 650 ByteLength = 112; 651 break; 652 653 case ACPI_DMT_BUF128: 654 655 ByteLength = 128; 656 break; 657 658 case ACPI_DMT_UNICODE: 659 case ACPI_DMT_WPBT_UNICODE: 660 661 Value = DtGetFieldValue (Field); 662 663 /* TBD: error if Value is NULL? (as below?) */ 664 665 ByteLength = (strlen (Value) + 1) * sizeof (UINT16); 666 break; 667 668 default: 669 670 DtFatal (ASL_MSG_COMPILER_INTERNAL, Field, "Invalid table opcode"); 671 return (0); 672 } 673 674 return (ByteLength); 675 } 676 677 678 /****************************************************************************** 679 * 680 * FUNCTION: DtSum 681 * 682 * PARAMETERS: DT_WALK_CALLBACK: 683 * Subtable - Subtable 684 * Context - Unused 685 * ReturnValue - Store the checksum of subtable 686 * 687 * RETURN: Status 688 * 689 * DESCRIPTION: Get the checksum of subtable 690 * 691 *****************************************************************************/ 692 693 static void 694 DtSum ( 695 DT_SUBTABLE *Subtable, 696 void *Context, 697 void *ReturnValue) 698 { 699 UINT8 Checksum; 700 UINT8 *Sum = ReturnValue; 701 702 703 Checksum = AcpiUtChecksum (Subtable->Buffer, Subtable->Length); 704 *Sum = (UINT8) (*Sum + Checksum); 705 } 706 707 708 /****************************************************************************** 709 * 710 * FUNCTION: DtSetTableChecksum 711 * 712 * PARAMETERS: ChecksumPointer - Where to return the checksum 713 * 714 * RETURN: None 715 * 716 * DESCRIPTION: Set checksum of the whole data table into the checksum field 717 * 718 *****************************************************************************/ 719 720 void 721 DtSetTableChecksum ( 722 UINT8 *ChecksumPointer) 723 { 724 UINT8 Checksum = 0; 725 UINT8 OldSum; 726 727 728 DtWalkTableTree (AslGbl_RootTable, DtSum, NULL, &Checksum); 729 730 OldSum = *ChecksumPointer; 731 Checksum = (UINT8) (Checksum - OldSum); 732 733 /* Compute the final checksum */ 734 735 Checksum = (UINT8) (0 - Checksum); 736 *ChecksumPointer = Checksum; 737 } 738 739 740 /****************************************************************************** 741 * 742 * FUNCTION: DtSetTableLength 743 * 744 * PARAMETERS: None 745 * 746 * RETURN: None 747 * 748 * DESCRIPTION: Walk the subtables and set all the length fields 749 * 750 *****************************************************************************/ 751 752 void 753 DtSetTableLength ( 754 void) 755 { 756 DT_SUBTABLE *ParentTable; 757 DT_SUBTABLE *ChildTable; 758 759 760 ParentTable = AslGbl_RootTable; 761 ChildTable = NULL; 762 763 if (!ParentTable) 764 { 765 return; 766 } 767 768 DtSetSubtableLength (ParentTable); 769 770 while (1) 771 { 772 ChildTable = DtGetNextSubtable (ParentTable, ChildTable); 773 if (ChildTable) 774 { 775 if (ChildTable->LengthField) 776 { 777 DtSetSubtableLength (ChildTable); 778 } 779 780 if (ChildTable->Child) 781 { 782 ParentTable = ChildTable; 783 ChildTable = NULL; 784 } 785 else 786 { 787 ParentTable->TotalLength += ChildTable->TotalLength; 788 if (ParentTable->LengthField) 789 { 790 DtSetSubtableLength (ParentTable); 791 } 792 } 793 } 794 else 795 { 796 ChildTable = ParentTable; 797 798 if (ChildTable == AslGbl_RootTable) 799 { 800 break; 801 } 802 803 ParentTable = DtGetParentSubtable (ParentTable); 804 805 ParentTable->TotalLength += ChildTable->TotalLength; 806 if (ParentTable->LengthField) 807 { 808 DtSetSubtableLength (ParentTable); 809 } 810 } 811 } 812 } 813 814 815 /****************************************************************************** 816 * 817 * FUNCTION: DtWalkTableTree 818 * 819 * PARAMETERS: StartTable - Subtable in the tree where walking begins 820 * UserFunction - Called during the walk 821 * Context - Passed to user function 822 * ReturnValue - The return value of UserFunction 823 * 824 * RETURN: None 825 * 826 * DESCRIPTION: Performs a depth-first walk of the subtable tree 827 * 828 *****************************************************************************/ 829 830 void 831 DtWalkTableTree ( 832 DT_SUBTABLE *StartTable, 833 DT_WALK_CALLBACK UserFunction, 834 void *Context, 835 void *ReturnValue) 836 { 837 DT_SUBTABLE *ParentTable; 838 DT_SUBTABLE *ChildTable; 839 840 841 ParentTable = StartTable; 842 ChildTable = NULL; 843 844 if (!ParentTable) 845 { 846 return; 847 } 848 849 UserFunction (ParentTable, Context, ReturnValue); 850 851 while (1) 852 { 853 ChildTable = DtGetNextSubtable (ParentTable, ChildTable); 854 if (ChildTable) 855 { 856 UserFunction (ChildTable, Context, ReturnValue); 857 858 if (ChildTable->Child) 859 { 860 ParentTable = ChildTable; 861 ChildTable = NULL; 862 } 863 } 864 else 865 { 866 ChildTable = ParentTable; 867 if (ChildTable == AslGbl_RootTable) 868 { 869 break; 870 } 871 872 ParentTable = DtGetParentSubtable (ParentTable); 873 874 if (ChildTable->Peer == StartTable) 875 { 876 break; 877 } 878 } 879 } 880 } 881