1 /****************************************************************************** 2 * 3 * Module Name: tbutils - table utilities 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2009, 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 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 *****************************************************************************/ 115 116 #define __TBUTILS_C__ 117 118 #include "acpi.h" 119 #include "accommon.h" 120 #include "actables.h" 121 122 #define _COMPONENT ACPI_TABLES 123 ACPI_MODULE_NAME ("tbutils") 124 125 /* Local prototypes */ 126 127 static void 128 AcpiTbFixString ( 129 char *String, 130 ACPI_SIZE Length); 131 132 static void 133 AcpiTbCleanupTableHeader ( 134 ACPI_TABLE_HEADER *OutHeader, 135 ACPI_TABLE_HEADER *Header); 136 137 static ACPI_PHYSICAL_ADDRESS 138 AcpiTbGetRootTableEntry ( 139 UINT8 *TableEntry, 140 UINT32 TableEntrySize); 141 142 143 /******************************************************************************* 144 * 145 * FUNCTION: AcpiTbInitializeFacs 146 * 147 * PARAMETERS: None 148 * 149 * RETURN: Status 150 * 151 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global 152 * for accessing the Global Lock and Firmware Waking Vector 153 * 154 ******************************************************************************/ 155 156 ACPI_STATUS 157 AcpiTbInitializeFacs ( 158 void) 159 { 160 ACPI_STATUS Status; 161 162 163 Status = AcpiGetTableByIndex (ACPI_TABLE_INDEX_FACS, 164 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &AcpiGbl_FACS)); 165 return (Status); 166 } 167 168 169 /******************************************************************************* 170 * 171 * FUNCTION: AcpiTbTablesLoaded 172 * 173 * PARAMETERS: None 174 * 175 * RETURN: TRUE if required ACPI tables are loaded 176 * 177 * DESCRIPTION: Determine if the minimum required ACPI tables are present 178 * (FADT, FACS, DSDT) 179 * 180 ******************************************************************************/ 181 182 BOOLEAN 183 AcpiTbTablesLoaded ( 184 void) 185 { 186 187 if (AcpiGbl_RootTableList.Count >= 3) 188 { 189 return (TRUE); 190 } 191 192 return (FALSE); 193 } 194 195 196 /******************************************************************************* 197 * 198 * FUNCTION: AcpiTbFixString 199 * 200 * PARAMETERS: String - String to be repaired 201 * Length - Maximum length 202 * 203 * RETURN: None 204 * 205 * DESCRIPTION: Replace every non-printable or non-ascii byte in the string 206 * with a question mark '?'. 207 * 208 ******************************************************************************/ 209 210 static void 211 AcpiTbFixString ( 212 char *String, 213 ACPI_SIZE Length) 214 { 215 216 while (Length && *String) 217 { 218 if (!ACPI_IS_PRINT (*String)) 219 { 220 *String = '?'; 221 } 222 String++; 223 Length--; 224 } 225 } 226 227 228 /******************************************************************************* 229 * 230 * FUNCTION: AcpiTbCleanupTableHeader 231 * 232 * PARAMETERS: OutHeader - Where the cleaned header is returned 233 * Header - Input ACPI table header 234 * 235 * RETURN: Returns the cleaned header in OutHeader 236 * 237 * DESCRIPTION: Copy the table header and ensure that all "string" fields in 238 * the header consist of printable characters. 239 * 240 ******************************************************************************/ 241 242 static void 243 AcpiTbCleanupTableHeader ( 244 ACPI_TABLE_HEADER *OutHeader, 245 ACPI_TABLE_HEADER *Header) 246 { 247 248 ACPI_MEMCPY (OutHeader, Header, sizeof (ACPI_TABLE_HEADER)); 249 250 AcpiTbFixString (OutHeader->Signature, ACPI_NAME_SIZE); 251 AcpiTbFixString (OutHeader->OemId, ACPI_OEM_ID_SIZE); 252 AcpiTbFixString (OutHeader->OemTableId, ACPI_OEM_TABLE_ID_SIZE); 253 AcpiTbFixString (OutHeader->AslCompilerId, ACPI_NAME_SIZE); 254 } 255 256 257 /******************************************************************************* 258 * 259 * FUNCTION: AcpiTbPrintTableHeader 260 * 261 * PARAMETERS: Address - Table physical address 262 * Header - Table header 263 * 264 * RETURN: None 265 * 266 * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP. 267 * 268 ******************************************************************************/ 269 270 void 271 AcpiTbPrintTableHeader ( 272 ACPI_PHYSICAL_ADDRESS Address, 273 ACPI_TABLE_HEADER *Header) 274 { 275 ACPI_TABLE_HEADER LocalHeader; 276 277 278 /* 279 * The reason that the Address is cast to a void pointer is so that we 280 * can use %p which will work properly on both 32-bit and 64-bit hosts. 281 */ 282 if (ACPI_COMPARE_NAME (Header->Signature, ACPI_SIG_FACS)) 283 { 284 /* FACS only has signature and length fields */ 285 286 ACPI_INFO ((AE_INFO, "%4.4s %p %05X", 287 Header->Signature, ACPI_CAST_PTR (void, Address), 288 Header->Length)); 289 } 290 else if (ACPI_COMPARE_NAME (Header->Signature, ACPI_SIG_RSDP)) 291 { 292 /* RSDP has no common fields */ 293 294 ACPI_MEMCPY (LocalHeader.OemId, 295 ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->OemId, ACPI_OEM_ID_SIZE); 296 AcpiTbFixString (LocalHeader.OemId, ACPI_OEM_ID_SIZE); 297 298 ACPI_INFO ((AE_INFO, "RSDP %p %05X (v%.2d %6.6s)", 299 ACPI_CAST_PTR (void, Address), 300 (ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->Revision > 0) ? 301 ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->Length : 20, 302 ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->Revision, 303 LocalHeader.OemId)); 304 } 305 else 306 { 307 /* Standard ACPI table with full common header */ 308 309 AcpiTbCleanupTableHeader (&LocalHeader, Header); 310 311 ACPI_INFO ((AE_INFO, 312 "%4.4s %p %05X (v%.2d %6.6s %8.8s %08X %4.4s %08X)", 313 LocalHeader.Signature, ACPI_CAST_PTR (void, Address), 314 LocalHeader.Length, LocalHeader.Revision, LocalHeader.OemId, 315 LocalHeader.OemTableId, LocalHeader.OemRevision, 316 LocalHeader.AslCompilerId, LocalHeader.AslCompilerRevision)); 317 } 318 } 319 320 321 /******************************************************************************* 322 * 323 * FUNCTION: AcpiTbValidateChecksum 324 * 325 * PARAMETERS: Table - ACPI table to verify 326 * Length - Length of entire table 327 * 328 * RETURN: Status 329 * 330 * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns 331 * exception on bad checksum. 332 * 333 ******************************************************************************/ 334 335 ACPI_STATUS 336 AcpiTbVerifyChecksum ( 337 ACPI_TABLE_HEADER *Table, 338 UINT32 Length) 339 { 340 UINT8 Checksum; 341 342 343 /* Compute the checksum on the table */ 344 345 Checksum = AcpiTbChecksum (ACPI_CAST_PTR (UINT8, Table), Length); 346 347 /* Checksum ok? (should be zero) */ 348 349 if (Checksum) 350 { 351 ACPI_WARNING ((AE_INFO, 352 "Incorrect checksum in table [%4.4s] - %2.2X, should be %2.2X", 353 Table->Signature, Table->Checksum, 354 (UINT8) (Table->Checksum - Checksum))); 355 356 #if (ACPI_CHECKSUM_ABORT) 357 return (AE_BAD_CHECKSUM); 358 #endif 359 } 360 361 return (AE_OK); 362 } 363 364 365 /******************************************************************************* 366 * 367 * FUNCTION: AcpiTbChecksum 368 * 369 * PARAMETERS: Buffer - Pointer to memory region to be checked 370 * Length - Length of this memory region 371 * 372 * RETURN: Checksum (UINT8) 373 * 374 * DESCRIPTION: Calculates circular checksum of memory region. 375 * 376 ******************************************************************************/ 377 378 UINT8 379 AcpiTbChecksum ( 380 UINT8 *Buffer, 381 UINT32 Length) 382 { 383 UINT8 Sum = 0; 384 UINT8 *End = Buffer + Length; 385 386 387 while (Buffer < End) 388 { 389 Sum = (UINT8) (Sum + *(Buffer++)); 390 } 391 392 return Sum; 393 } 394 395 396 /******************************************************************************* 397 * 398 * FUNCTION: AcpiTbInstallTable 399 * 400 * PARAMETERS: Address - Physical address of DSDT or FACS 401 * Signature - Table signature, NULL if no need to 402 * match 403 * TableIndex - Index into root table array 404 * 405 * RETURN: None 406 * 407 * DESCRIPTION: Install an ACPI table into the global data structure. The 408 * table override mechanism is implemented here to allow the host 409 * OS to replace any table before it is installed in the root 410 * table array. 411 * 412 ******************************************************************************/ 413 414 void 415 AcpiTbInstallTable ( 416 ACPI_PHYSICAL_ADDRESS Address, 417 char *Signature, 418 UINT32 TableIndex) 419 { 420 UINT8 Flags; 421 ACPI_STATUS Status; 422 ACPI_TABLE_HEADER *TableToInstall; 423 ACPI_TABLE_HEADER *MappedTable; 424 ACPI_TABLE_HEADER *OverrideTable = NULL; 425 426 427 if (!Address) 428 { 429 ACPI_ERROR ((AE_INFO, "Null physical address for ACPI table [%s]", 430 Signature)); 431 return; 432 } 433 434 /* Map just the table header */ 435 436 MappedTable = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER)); 437 if (!MappedTable) 438 { 439 return; 440 } 441 442 /* If a particular signature is expected (DSDT/FACS), it must match */ 443 444 if (Signature && 445 !ACPI_COMPARE_NAME (MappedTable->Signature, Signature)) 446 { 447 ACPI_ERROR ((AE_INFO, 448 "Invalid signature 0x%X for ACPI table, expected [%s]", 449 *ACPI_CAST_PTR (UINT32, MappedTable->Signature), Signature)); 450 goto UnmapAndExit; 451 } 452 453 /* 454 * ACPI Table Override: 455 * 456 * Before we install the table, let the host OS override it with a new 457 * one if desired. Any table within the RSDT/XSDT can be replaced, 458 * including the DSDT which is pointed to by the FADT. 459 */ 460 Status = AcpiOsTableOverride (MappedTable, &OverrideTable); 461 if (ACPI_SUCCESS (Status) && OverrideTable) 462 { 463 ACPI_INFO ((AE_INFO, 464 "%4.4s @ 0x%p Table override, replaced with:", 465 MappedTable->Signature, ACPI_CAST_PTR (void, Address))); 466 467 AcpiGbl_RootTableList.Tables[TableIndex].Pointer = OverrideTable; 468 Address = ACPI_PTR_TO_PHYSADDR (OverrideTable); 469 470 TableToInstall = OverrideTable; 471 Flags = ACPI_TABLE_ORIGIN_OVERRIDE; 472 } 473 else 474 { 475 TableToInstall = MappedTable; 476 Flags = ACPI_TABLE_ORIGIN_MAPPED; 477 } 478 479 /* Initialize the table entry */ 480 481 AcpiGbl_RootTableList.Tables[TableIndex].Address = Address; 482 AcpiGbl_RootTableList.Tables[TableIndex].Length = TableToInstall->Length; 483 AcpiGbl_RootTableList.Tables[TableIndex].Flags = Flags; 484 485 ACPI_MOVE_32_TO_32 ( 486 &(AcpiGbl_RootTableList.Tables[TableIndex].Signature), 487 TableToInstall->Signature); 488 489 AcpiTbPrintTableHeader (Address, TableToInstall); 490 491 if (TableIndex == ACPI_TABLE_INDEX_DSDT) 492 { 493 /* Global integer width is based upon revision of the DSDT */ 494 495 AcpiUtSetIntegerWidth (TableToInstall->Revision); 496 } 497 498 UnmapAndExit: 499 AcpiOsUnmapMemory (MappedTable, sizeof (ACPI_TABLE_HEADER)); 500 } 501 502 503 /******************************************************************************* 504 * 505 * FUNCTION: AcpiTbGetRootTableEntry 506 * 507 * PARAMETERS: TableEntry - Pointer to the RSDT/XSDT table entry 508 * TableEntrySize - sizeof 32 or 64 (RSDT or XSDT) 509 * 510 * RETURN: Physical address extracted from the root table 511 * 512 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on 513 * both 32-bit and 64-bit platforms 514 * 515 * NOTE: ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on 516 * 64-bit platforms. 517 * 518 ******************************************************************************/ 519 520 static ACPI_PHYSICAL_ADDRESS 521 AcpiTbGetRootTableEntry ( 522 UINT8 *TableEntry, 523 UINT32 TableEntrySize) 524 { 525 UINT64 Address64; 526 527 528 /* 529 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT): 530 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT 531 */ 532 if (TableEntrySize == sizeof (UINT32)) 533 { 534 /* 535 * 32-bit platform, RSDT: Return 32-bit table entry 536 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return 537 */ 538 return ((ACPI_PHYSICAL_ADDRESS) (*ACPI_CAST_PTR (UINT32, TableEntry))); 539 } 540 else 541 { 542 /* 543 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return 544 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, 545 * return 64-bit 546 */ 547 ACPI_MOVE_64_TO_64 (&Address64, TableEntry); 548 549 #if ACPI_MACHINE_WIDTH == 32 550 if (Address64 > ACPI_UINT32_MAX) 551 { 552 /* Will truncate 64-bit address to 32 bits, issue warning */ 553 554 ACPI_WARNING ((AE_INFO, 555 "64-bit Physical Address in XSDT is too large (%8.8X%8.8X)," 556 " truncating", 557 ACPI_FORMAT_UINT64 (Address64))); 558 } 559 #endif 560 return ((ACPI_PHYSICAL_ADDRESS) (Address64)); 561 } 562 } 563 564 565 /******************************************************************************* 566 * 567 * FUNCTION: AcpiTbParseRootTable 568 * 569 * PARAMETERS: Rsdp - Pointer to the RSDP 570 * 571 * RETURN: Status 572 * 573 * DESCRIPTION: This function is called to parse the Root System Description 574 * Table (RSDT or XSDT) 575 * 576 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must 577 * be mapped and cannot be copied because it contains the actual 578 * memory location of the ACPI Global Lock. 579 * 580 ******************************************************************************/ 581 582 ACPI_STATUS 583 AcpiTbParseRootTable ( 584 ACPI_PHYSICAL_ADDRESS RsdpAddress) 585 { 586 ACPI_TABLE_RSDP *Rsdp; 587 UINT32 TableEntrySize; 588 UINT32 i; 589 UINT32 TableCount; 590 ACPI_TABLE_HEADER *Table; 591 ACPI_PHYSICAL_ADDRESS Address; 592 UINT32 Length; 593 UINT8 *TableEntry; 594 ACPI_STATUS Status; 595 596 597 ACPI_FUNCTION_TRACE (TbParseRootTable); 598 599 600 /* 601 * Map the entire RSDP and extract the address of the RSDT or XSDT 602 */ 603 Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP)); 604 if (!Rsdp) 605 { 606 return_ACPI_STATUS (AE_NO_MEMORY); 607 } 608 609 AcpiTbPrintTableHeader (RsdpAddress, 610 ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp)); 611 612 /* Differentiate between RSDT and XSDT root tables */ 613 614 if (Rsdp->Revision > 1 && Rsdp->XsdtPhysicalAddress) 615 { 616 /* 617 * Root table is an XSDT (64-bit physical addresses). We must use the 618 * XSDT if the revision is > 1 and the XSDT pointer is present, as per 619 * the ACPI specification. 620 */ 621 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress; 622 TableEntrySize = sizeof (UINT64); 623 } 624 else 625 { 626 /* Root table is an RSDT (32-bit physical addresses) */ 627 628 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress; 629 TableEntrySize = sizeof (UINT32); 630 } 631 632 /* 633 * It is not possible to map more than one entry in some environments, 634 * so unmap the RSDP here before mapping other tables 635 */ 636 AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP)); 637 638 639 /* Map the RSDT/XSDT table header to get the full table length */ 640 641 Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER)); 642 if (!Table) 643 { 644 return_ACPI_STATUS (AE_NO_MEMORY); 645 } 646 647 AcpiTbPrintTableHeader (Address, Table); 648 649 /* Get the length of the full table, verify length and map entire table */ 650 651 Length = Table->Length; 652 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER)); 653 654 if (Length < sizeof (ACPI_TABLE_HEADER)) 655 { 656 ACPI_ERROR ((AE_INFO, "Invalid length 0x%X in RSDT/XSDT", Length)); 657 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); 658 } 659 660 Table = AcpiOsMapMemory (Address, Length); 661 if (!Table) 662 { 663 return_ACPI_STATUS (AE_NO_MEMORY); 664 } 665 666 /* Validate the root table checksum */ 667 668 Status = AcpiTbVerifyChecksum (Table, Length); 669 if (ACPI_FAILURE (Status)) 670 { 671 AcpiOsUnmapMemory (Table, Length); 672 return_ACPI_STATUS (Status); 673 } 674 675 /* Calculate the number of tables described in the root table */ 676 677 TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) / 678 TableEntrySize); 679 680 /* 681 * First two entries in the table array are reserved for the DSDT 682 * and FACS, which are not actually present in the RSDT/XSDT - they 683 * come from the FADT 684 */ 685 TableEntry = ACPI_CAST_PTR (UINT8, Table) + sizeof (ACPI_TABLE_HEADER); 686 AcpiGbl_RootTableList.Count = 2; 687 688 /* 689 * Initialize the root table array from the RSDT/XSDT 690 */ 691 for (i = 0; i < TableCount; i++) 692 { 693 if (AcpiGbl_RootTableList.Count >= AcpiGbl_RootTableList.Size) 694 { 695 /* There is no more room in the root table array, attempt resize */ 696 697 Status = AcpiTbResizeRootTableList (); 698 if (ACPI_FAILURE (Status)) 699 { 700 ACPI_WARNING ((AE_INFO, "Truncating %u table entries!", 701 (unsigned) (TableCount - 702 (AcpiGbl_RootTableList.Count - 2)))); 703 break; 704 } 705 } 706 707 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */ 708 709 AcpiGbl_RootTableList.Tables[AcpiGbl_RootTableList.Count].Address = 710 AcpiTbGetRootTableEntry (TableEntry, TableEntrySize); 711 712 TableEntry += TableEntrySize; 713 AcpiGbl_RootTableList.Count++; 714 } 715 716 /* 717 * It is not possible to map more than one entry in some environments, 718 * so unmap the root table here before mapping other tables 719 */ 720 AcpiOsUnmapMemory (Table, Length); 721 722 /* 723 * Complete the initialization of the root table array by examining 724 * the header of each table 725 */ 726 for (i = 2; i < AcpiGbl_RootTableList.Count; i++) 727 { 728 AcpiTbInstallTable (AcpiGbl_RootTableList.Tables[i].Address, 729 NULL, i); 730 731 /* Special case for FADT - get the DSDT and FACS */ 732 733 if (ACPI_COMPARE_NAME ( 734 &AcpiGbl_RootTableList.Tables[i].Signature, ACPI_SIG_FADT)) 735 { 736 AcpiTbParseFadt (i); 737 } 738 } 739 740 return_ACPI_STATUS (AE_OK); 741 } 742