1 /****************************************************************************** 2 * 3 * Module Name: dtutils.c - Utility routines for the data table compiler 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2022, 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_BUF128: 335 case ACPI_DMT_PCI_PATH: 336 case ACPI_DMT_PMTT_VENDOR: 337 338 Type = DT_FIELD_TYPE_BUFFER; 339 break; 340 341 case ACPI_DMT_GAS: 342 case ACPI_DMT_HESTNTFY: 343 case ACPI_DMT_IORTMEM: 344 345 Type = DT_FIELD_TYPE_INLINE_SUBTABLE; 346 break; 347 348 case ACPI_DMT_UNICODE: 349 case ACPI_DMT_WPBT_UNICODE: 350 351 Type = DT_FIELD_TYPE_UNICODE; 352 break; 353 354 case ACPI_DMT_UUID: 355 356 Type = DT_FIELD_TYPE_UUID; 357 break; 358 359 case ACPI_DMT_DEVICE_PATH: 360 361 Type = DT_FIELD_TYPE_DEVICE_PATH; 362 break; 363 364 case ACPI_DMT_LABEL: 365 366 Type = DT_FIELD_TYPE_LABEL; 367 break; 368 369 default: 370 371 Type = DT_FIELD_TYPE_INTEGER; 372 break; 373 } 374 375 return (Type); 376 } 377 378 379 /****************************************************************************** 380 * 381 * FUNCTION: DtGetBufferLength 382 * 383 * PARAMETERS: Buffer - List of integers, 384 * for example "10 3A 4F 2E" 385 * 386 * RETURN: Count of integer 387 * 388 * DESCRIPTION: Get length of bytes needed to store the integers 389 * 390 *****************************************************************************/ 391 392 UINT32 393 DtGetBufferLength ( 394 char *Buffer) 395 { 396 UINT32 ByteLength = 0; 397 398 399 while (*Buffer) 400 { 401 if (*Buffer == ' ') 402 { 403 ByteLength++; 404 405 while (*Buffer == ' ') 406 { 407 Buffer++; 408 } 409 } 410 411 Buffer++; 412 } 413 414 return (++ByteLength); 415 } 416 417 418 /****************************************************************************** 419 * 420 * FUNCTION: DtGetFieldLength 421 * 422 * PARAMETERS: Field - Current field 423 * Info - Data table info 424 * 425 * RETURN: Field length 426 * 427 * DESCRIPTION: Get length of bytes needed to compile the field 428 * 429 * Note: This function must remain in sync with AcpiDmDumpTable. 430 * 431 *****************************************************************************/ 432 433 UINT32 434 DtGetFieldLength ( 435 DT_FIELD *Field, 436 ACPI_DMTABLE_INFO *Info) 437 { 438 UINT32 ByteLength = 0; 439 char *Value; 440 441 442 /* Length is based upon the opcode for this field in the info table */ 443 444 switch (Info->Opcode) 445 { 446 case ACPI_DMT_FLAG0: 447 case ACPI_DMT_FLAG1: 448 case ACPI_DMT_FLAG2: 449 case ACPI_DMT_FLAG3: 450 case ACPI_DMT_FLAG4: 451 case ACPI_DMT_FLAG5: 452 case ACPI_DMT_FLAG6: 453 case ACPI_DMT_FLAG7: 454 case ACPI_DMT_FLAGS0: 455 case ACPI_DMT_FLAGS1: 456 case ACPI_DMT_FLAGS2: 457 case ACPI_DMT_FLAGS8_2: 458 case ACPI_DMT_FLAGS4: 459 case ACPI_DMT_FLAGS4_0: 460 case ACPI_DMT_FLAGS4_4: 461 case ACPI_DMT_FLAGS4_8: 462 case ACPI_DMT_FLAGS4_12: 463 case ACPI_DMT_FLAGS16_16: 464 case ACPI_DMT_LABEL: 465 case ACPI_DMT_EXTRA_TEXT: 466 467 ByteLength = 0; 468 break; 469 470 case ACPI_DMT_UINT8: 471 case ACPI_DMT_CHKSUM: 472 case ACPI_DMT_SPACEID: 473 case ACPI_DMT_ACCWIDTH: 474 case ACPI_DMT_CEDT: 475 case ACPI_DMT_IVRS: 476 case ACPI_DMT_IVRS_DE: 477 case ACPI_DMT_GTDT: 478 case ACPI_DMT_MADT: 479 case ACPI_DMT_NHLT1: 480 case ACPI_DMT_NHLT1a: 481 case ACPI_DMT_NHLT1b: 482 case ACPI_DMT_NHLT1c: 483 case ACPI_DMT_NHLT1d: 484 case ACPI_DMT_NHLT1f: 485 case ACPI_DMT_PCCT: 486 case ACPI_DMT_PMTT: 487 case ACPI_DMT_PPTT: 488 case ACPI_DMT_RGRT: 489 case ACPI_DMT_SDEV: 490 case ACPI_DMT_SRAT: 491 case ACPI_DMT_AEST: 492 case ACPI_DMT_AEST_RES: 493 case ACPI_DMT_AEST_XFACE: 494 case ACPI_DMT_AEST_XRUPT: 495 case ACPI_DMT_ASF: 496 case ACPI_DMT_CDAT: 497 case ACPI_DMT_HESTNTYP: 498 case ACPI_DMT_FADTPM: 499 case ACPI_DMT_EINJACT: 500 case ACPI_DMT_EINJINST: 501 case ACPI_DMT_ERSTACT: 502 case ACPI_DMT_ERSTINST: 503 case ACPI_DMT_DMAR_SCOPE: 504 case ACPI_DMT_VIOT: 505 506 ByteLength = 1; 507 break; 508 509 case ACPI_DMT_UINT16: 510 case ACPI_DMT_DMAR: 511 case ACPI_DMT_HEST: 512 case ACPI_DMT_HMAT: 513 case ACPI_DMT_NFIT: 514 case ACPI_DMT_NHLT1e: 515 case ACPI_DMT_PCI_PATH: 516 case ACPI_DMT_PHAT: 517 518 ByteLength = 2; 519 break; 520 521 case ACPI_DMT_UINT24: 522 523 ByteLength = 3; 524 break; 525 526 case ACPI_DMT_UINT32: 527 case ACPI_DMT_AEST_CACHE: 528 case ACPI_DMT_AEST_GIC: 529 case ACPI_DMT_NAME4: 530 case ACPI_DMT_SIG: 531 case ACPI_DMT_LPIT: 532 case ACPI_DMT_TPM2: 533 534 ByteLength = 4; 535 break; 536 537 case ACPI_DMT_UINT40: 538 539 ByteLength = 5; 540 break; 541 542 case ACPI_DMT_UINT48: 543 case ACPI_DMT_NAME6: 544 545 ByteLength = 6; 546 break; 547 548 case ACPI_DMT_UINT56: 549 case ACPI_DMT_BUF7: 550 551 ByteLength = 7; 552 break; 553 554 case ACPI_DMT_UINT64: 555 case ACPI_DMT_NAME8: 556 557 ByteLength = 8; 558 break; 559 560 case ACPI_DMT_STRING: 561 562 Value = DtGetFieldValue (Field); 563 if (Value) 564 { 565 ByteLength = strlen (Value) + 1; 566 } 567 else 568 { /* At this point, this is a fatal error */ 569 570 snprintf (AslGbl_MsgBuffer, sizeof(AslGbl_MsgBuffer), "Expected \"%s\"", Info->Name); 571 DtFatal (ASL_MSG_COMPILER_INTERNAL, NULL, AslGbl_MsgBuffer); 572 return (0); 573 } 574 break; 575 576 case ACPI_DMT_IVRS_UNTERMINATED_STRING: 577 578 Value = DtGetFieldValue (Field); 579 if (Value) 580 { 581 ByteLength = strlen (Value); 582 } 583 else 584 { /* At this point, this is a fatal error */ 585 586 snprintf (AslGbl_MsgBuffer, sizeof(AslGbl_MsgBuffer), "Expected \"%s\"", Info->Name); 587 DtFatal (ASL_MSG_COMPILER_INTERNAL, NULL, AslGbl_MsgBuffer); 588 return (0); 589 } 590 break; 591 592 case ACPI_DMT_GAS: 593 594 ByteLength = sizeof (ACPI_GENERIC_ADDRESS); 595 break; 596 597 case ACPI_DMT_HESTNTFY: 598 599 ByteLength = sizeof (ACPI_HEST_NOTIFY); 600 break; 601 602 case ACPI_DMT_IORTMEM: 603 604 ByteLength = sizeof (ACPI_IORT_MEMORY_ACCESS); 605 break; 606 607 case ACPI_DMT_BUFFER: 608 case ACPI_DMT_RAW_BUFFER: 609 case ACPI_DMT_PMTT_VENDOR: 610 611 Value = DtGetFieldValue (Field); 612 if (Value) 613 { 614 ByteLength = DtGetBufferLength (Value); 615 } 616 else 617 { /* At this point, this is a fatal error */ 618 619 snprintf (AslGbl_MsgBuffer, sizeof(AslGbl_MsgBuffer), "Expected \"%s\"", Info->Name); 620 DtFatal (ASL_MSG_COMPILER_INTERNAL, NULL, AslGbl_MsgBuffer); 621 return (0); 622 } 623 break; 624 625 case ACPI_DMT_BUF10: 626 627 ByteLength = 10; 628 break; 629 630 case ACPI_DMT_BUF12: 631 632 ByteLength = 12; 633 break; 634 635 case ACPI_DMT_BUF16: 636 case ACPI_DMT_UUID: 637 638 ByteLength = 16; 639 break; 640 641 case ACPI_DMT_BUF18: 642 643 ByteLength = 18; 644 break; 645 646 case ACPI_DMT_BUF128: 647 648 ByteLength = 128; 649 break; 650 651 case ACPI_DMT_UNICODE: 652 case ACPI_DMT_WPBT_UNICODE: 653 654 Value = DtGetFieldValue (Field); 655 656 /* TBD: error if Value is NULL? (as below?) */ 657 658 ByteLength = (strlen (Value) + 1) * sizeof (UINT16); 659 break; 660 661 default: 662 663 DtFatal (ASL_MSG_COMPILER_INTERNAL, Field, "Invalid table opcode"); 664 return (0); 665 } 666 667 return (ByteLength); 668 } 669 670 671 /****************************************************************************** 672 * 673 * FUNCTION: DtSum 674 * 675 * PARAMETERS: DT_WALK_CALLBACK: 676 * Subtable - Subtable 677 * Context - Unused 678 * ReturnValue - Store the checksum of subtable 679 * 680 * RETURN: Status 681 * 682 * DESCRIPTION: Get the checksum of subtable 683 * 684 *****************************************************************************/ 685 686 static void 687 DtSum ( 688 DT_SUBTABLE *Subtable, 689 void *Context, 690 void *ReturnValue) 691 { 692 UINT8 Checksum; 693 UINT8 *Sum = ReturnValue; 694 695 696 Checksum = AcpiUtChecksum (Subtable->Buffer, Subtable->Length); 697 *Sum = (UINT8) (*Sum + Checksum); 698 } 699 700 701 /****************************************************************************** 702 * 703 * FUNCTION: DtSetTableChecksum 704 * 705 * PARAMETERS: ChecksumPointer - Where to return the checksum 706 * 707 * RETURN: None 708 * 709 * DESCRIPTION: Set checksum of the whole data table into the checksum field 710 * 711 *****************************************************************************/ 712 713 void 714 DtSetTableChecksum ( 715 UINT8 *ChecksumPointer) 716 { 717 UINT8 Checksum = 0; 718 UINT8 OldSum; 719 720 721 DtWalkTableTree (AslGbl_RootTable, DtSum, NULL, &Checksum); 722 723 OldSum = *ChecksumPointer; 724 Checksum = (UINT8) (Checksum - OldSum); 725 726 /* Compute the final checksum */ 727 728 Checksum = (UINT8) (0 - Checksum); 729 *ChecksumPointer = Checksum; 730 } 731 732 733 /****************************************************************************** 734 * 735 * FUNCTION: DtSetTableLength 736 * 737 * PARAMETERS: None 738 * 739 * RETURN: None 740 * 741 * DESCRIPTION: Walk the subtables and set all the length fields 742 * 743 *****************************************************************************/ 744 745 void 746 DtSetTableLength ( 747 void) 748 { 749 DT_SUBTABLE *ParentTable; 750 DT_SUBTABLE *ChildTable; 751 752 753 ParentTable = AslGbl_RootTable; 754 ChildTable = NULL; 755 756 if (!ParentTable) 757 { 758 return; 759 } 760 761 DtSetSubtableLength (ParentTable); 762 763 while (1) 764 { 765 ChildTable = DtGetNextSubtable (ParentTable, ChildTable); 766 if (ChildTable) 767 { 768 if (ChildTable->LengthField) 769 { 770 DtSetSubtableLength (ChildTable); 771 } 772 773 if (ChildTable->Child) 774 { 775 ParentTable = ChildTable; 776 ChildTable = NULL; 777 } 778 else 779 { 780 ParentTable->TotalLength += ChildTable->TotalLength; 781 if (ParentTable->LengthField) 782 { 783 DtSetSubtableLength (ParentTable); 784 } 785 } 786 } 787 else 788 { 789 ChildTable = ParentTable; 790 791 if (ChildTable == AslGbl_RootTable) 792 { 793 break; 794 } 795 796 ParentTable = DtGetParentSubtable (ParentTable); 797 798 ParentTable->TotalLength += ChildTable->TotalLength; 799 if (ParentTable->LengthField) 800 { 801 DtSetSubtableLength (ParentTable); 802 } 803 } 804 } 805 } 806 807 808 /****************************************************************************** 809 * 810 * FUNCTION: DtWalkTableTree 811 * 812 * PARAMETERS: StartTable - Subtable in the tree where walking begins 813 * UserFunction - Called during the walk 814 * Context - Passed to user function 815 * ReturnValue - The return value of UserFunction 816 * 817 * RETURN: None 818 * 819 * DESCRIPTION: Performs a depth-first walk of the subtable tree 820 * 821 *****************************************************************************/ 822 823 void 824 DtWalkTableTree ( 825 DT_SUBTABLE *StartTable, 826 DT_WALK_CALLBACK UserFunction, 827 void *Context, 828 void *ReturnValue) 829 { 830 DT_SUBTABLE *ParentTable; 831 DT_SUBTABLE *ChildTable; 832 833 834 ParentTable = StartTable; 835 ChildTable = NULL; 836 837 if (!ParentTable) 838 { 839 return; 840 } 841 842 UserFunction (ParentTable, Context, ReturnValue); 843 844 while (1) 845 { 846 ChildTable = DtGetNextSubtable (ParentTable, ChildTable); 847 if (ChildTable) 848 { 849 UserFunction (ChildTable, Context, ReturnValue); 850 851 if (ChildTable->Child) 852 { 853 ParentTable = ChildTable; 854 ChildTable = NULL; 855 } 856 } 857 else 858 { 859 ChildTable = ParentTable; 860 if (ChildTable == AslGbl_RootTable) 861 { 862 break; 863 } 864 865 ParentTable = DtGetParentSubtable (ParentTable); 866 867 if (ChildTable->Peer == StartTable) 868 { 869 break; 870 } 871 } 872 } 873 } 874