1 /****************************************************************************** 2 * 3 * Module Name: tbxfroot - Find the root ACPI table (RSDT) 4 * $Revision: 1.102 $ 5 * 6 *****************************************************************************/ 7 8 /****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2006, Intel Corp. 13 * All rights reserved. 14 * 15 * 2. License 16 * 17 * 2.1. This is your license from Intel Corp. under its intellectual property 18 * rights. You may have additional license terms from the party that provided 19 * you this software, covering your right to use that party's intellectual 20 * property rights. 21 * 22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23 * copy of the source code appearing in this file ("Covered Code") an 24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25 * base code distributed originally by Intel ("Original Intel Code") to copy, 26 * make derivatives, distribute, use and display any portion of the Covered 27 * Code in any form, with the right to sublicense such rights; and 28 * 29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30 * license (with the right to sublicense), under only those claims of Intel 31 * patents that are infringed by the Original Intel Code, to make, use, sell, 32 * offer to sell, and import the Covered Code and derivative works thereof 33 * solely to the minimum extent necessary to exercise the above copyright 34 * license, and in no event shall the patent license extend to any additions 35 * to or modifications of the Original Intel Code. No other license or right 36 * is granted directly or by implication, estoppel or otherwise; 37 * 38 * The above copyright and patent license is granted only if the following 39 * conditions are met: 40 * 41 * 3. Conditions 42 * 43 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44 * Redistribution of source code of any substantial portion of the Covered 45 * Code or modification with rights to further distribute source must include 46 * the above Copyright Notice, the above License, this list of Conditions, 47 * and the following Disclaimer and Export Compliance provision. In addition, 48 * Licensee must cause all Covered Code to which Licensee contributes to 49 * contain a file documenting the changes Licensee made to create that Covered 50 * Code and the date of any change. Licensee must include in that file the 51 * documentation of any changes made by any predecessor Licensee. Licensee 52 * must include a prominent statement that the modification is derived, 53 * directly or indirectly, from Original Intel Code. 54 * 55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56 * Redistribution of source code of any substantial portion of the Covered 57 * Code or modification without rights to further distribute source must 58 * include the following Disclaimer and Export Compliance provision in the 59 * documentation and/or other materials provided with distribution. In 60 * addition, Licensee may not authorize further sublicense of source of any 61 * portion of the Covered Code, and must include terms to the effect that the 62 * license from Licensee to its licensee is limited to the intellectual 63 * property embodied in the software Licensee provides to its licensee, and 64 * not to intellectual property embodied in modifications its licensee may 65 * make. 66 * 67 * 3.3. Redistribution of Executable. Redistribution in executable form of any 68 * substantial portion of the Covered Code or modification must reproduce the 69 * above Copyright Notice, and the following Disclaimer and Export Compliance 70 * provision in the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3.4. Intel retains all right, title, and interest in and to the Original 74 * Intel Code. 75 * 76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 77 * Intel shall be used in advertising or otherwise to promote the sale, use or 78 * other dealings in products derived from or relating to the Covered Code 79 * without prior written authorization from Intel. 80 * 81 * 4. Disclaimer and Export Compliance 82 * 83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 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 __TBXFROOT_C__ 118 119 #include "acpi.h" 120 #include "actables.h" 121 122 123 #define _COMPONENT ACPI_TABLES 124 ACPI_MODULE_NAME ("tbxfroot") 125 126 /* Local prototypes */ 127 128 static ACPI_STATUS 129 AcpiTbFindRsdp ( 130 ACPI_TABLE_DESC *TableInfo, 131 UINT32 Flags); 132 133 static UINT8 * 134 AcpiTbScanMemoryForRsdp ( 135 UINT8 *StartAddress, 136 UINT32 Length); 137 138 139 /******************************************************************************* 140 * 141 * FUNCTION: AcpiTbValidateRsdp 142 * 143 * PARAMETERS: Rsdp - Pointer to unvalidated RSDP 144 * 145 * RETURN: Status 146 * 147 * DESCRIPTION: Validate the RSDP (ptr) 148 * 149 ******************************************************************************/ 150 151 ACPI_STATUS 152 AcpiTbValidateRsdp ( 153 RSDP_DESCRIPTOR *Rsdp) 154 { 155 ACPI_FUNCTION_ENTRY (); 156 157 158 /* 159 * The signature and checksum must both be correct 160 */ 161 if (ACPI_STRNCMP ((char *) Rsdp, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) 162 { 163 /* Nope, BAD Signature */ 164 165 return (AE_BAD_SIGNATURE); 166 } 167 168 /* Check the standard checksum */ 169 170 if (AcpiTbSumTable (Rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) 171 { 172 return (AE_BAD_CHECKSUM); 173 } 174 175 /* Check extended checksum if table version >= 2 */ 176 177 if ((Rsdp->Revision >= 2) && 178 (AcpiTbSumTable (Rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)) 179 { 180 return (AE_BAD_CHECKSUM); 181 } 182 183 return (AE_OK); 184 } 185 186 187 /******************************************************************************* 188 * 189 * FUNCTION: AcpiTbFindTable 190 * 191 * PARAMETERS: Signature - String with ACPI table signature 192 * OemId - String with the table OEM ID 193 * OemTableId - String with the OEM Table ID 194 * TablePtr - Where the table pointer is returned 195 * 196 * RETURN: Status 197 * 198 * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the 199 * Signature, OEM ID and OEM Table ID. 200 * 201 ******************************************************************************/ 202 203 ACPI_STATUS 204 AcpiTbFindTable ( 205 char *Signature, 206 char *OemId, 207 char *OemTableId, 208 ACPI_TABLE_HEADER **TablePtr) 209 { 210 ACPI_STATUS Status; 211 ACPI_TABLE_HEADER *Table; 212 213 214 ACPI_FUNCTION_TRACE (TbFindTable); 215 216 217 /* Validate string lengths */ 218 219 if ((ACPI_STRLEN (Signature) > ACPI_NAME_SIZE) || 220 (ACPI_STRLEN (OemId) > sizeof (Table->OemId)) || 221 (ACPI_STRLEN (OemTableId) > sizeof (Table->OemTableId))) 222 { 223 return_ACPI_STATUS (AE_AML_STRING_LIMIT); 224 } 225 226 if (ACPI_COMPARE_NAME (Signature, DSDT_SIG)) 227 { 228 /* 229 * The DSDT pointer is contained in the FADT, not the RSDT. 230 * This code should suffice, because the only code that would perform 231 * a "find" on the DSDT is the DataTableRegion() AML opcode -- in 232 * which case, the DSDT is guaranteed to be already loaded. 233 * If this becomes insufficient, the FADT will have to be found first. 234 */ 235 if (!AcpiGbl_DSDT) 236 { 237 return_ACPI_STATUS (AE_NO_ACPI_TABLES); 238 } 239 Table = AcpiGbl_DSDT; 240 } 241 else 242 { 243 /* Find the table */ 244 245 Status = AcpiGetFirmwareTable (Signature, 1, 246 ACPI_LOGICAL_ADDRESSING, &Table); 247 if (ACPI_FAILURE (Status)) 248 { 249 return_ACPI_STATUS (Status); 250 } 251 } 252 253 /* Check OemId and OemTableId */ 254 255 if ((OemId[0] && 256 ACPI_STRNCMP ( 257 OemId, Table->OemId, 258 sizeof (Table->OemId))) || 259 260 (OemTableId[0] && 261 ACPI_STRNCMP ( 262 OemTableId, Table->OemTableId, 263 sizeof (Table->OemTableId)))) 264 { 265 return_ACPI_STATUS (AE_AML_NAME_NOT_FOUND); 266 } 267 268 ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Found table [%4.4s]\n", 269 Table->Signature)); 270 271 *TablePtr = Table; 272 return_ACPI_STATUS (AE_OK); 273 } 274 275 276 /******************************************************************************* 277 * 278 * FUNCTION: AcpiGetFirmwareTable 279 * 280 * PARAMETERS: Signature - Any ACPI table signature 281 * Instance - the non zero instance of the table, allows 282 * support for multiple tables of the same type 283 * Flags - Physical/Virtual support 284 * TablePointer - Where a buffer containing the table is 285 * returned 286 * 287 * RETURN: Status 288 * 289 * DESCRIPTION: This function is called to get an ACPI table. A buffer is 290 * allocated for the table and returned in TablePointer. 291 * This table will be a complete table including the header. 292 * 293 ******************************************************************************/ 294 295 ACPI_STATUS 296 AcpiGetFirmwareTable ( 297 ACPI_STRING Signature, 298 UINT32 Instance, 299 UINT32 Flags, 300 ACPI_TABLE_HEADER **TablePointer) 301 { 302 ACPI_STATUS Status; 303 ACPI_POINTER Address; 304 ACPI_TABLE_HEADER *Header = NULL; 305 ACPI_TABLE_DESC *TableInfo = NULL; 306 ACPI_TABLE_DESC *RsdtInfo; 307 UINT32 TableCount; 308 UINT32 i; 309 UINT32 j; 310 311 312 ACPI_FUNCTION_TRACE (AcpiGetFirmwareTable); 313 314 315 /* 316 * Ensure that at least the table manager is initialized. We don't 317 * require that the entire ACPI subsystem is up for this interface. 318 * If we have a buffer, we must have a length too 319 */ 320 if ((Instance == 0) || 321 (!Signature) || 322 (!TablePointer)) 323 { 324 return_ACPI_STATUS (AE_BAD_PARAMETER); 325 } 326 327 /* Ensure that we have a RSDP */ 328 329 if (!AcpiGbl_RSDP) 330 { 331 /* Get the RSDP */ 332 333 Status = AcpiOsGetRootPointer (Flags, &Address); 334 if (ACPI_FAILURE (Status)) 335 { 336 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "RSDP not found\n")); 337 return_ACPI_STATUS (AE_NO_ACPI_TABLES); 338 } 339 340 /* Map and validate the RSDP */ 341 342 if ((Flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) 343 { 344 Status = AcpiOsMapMemory (Address.Pointer.Physical, 345 sizeof (RSDP_DESCRIPTOR), (void *) &AcpiGbl_RSDP); 346 if (ACPI_FAILURE (Status)) 347 { 348 return_ACPI_STATUS (Status); 349 } 350 } 351 else 352 { 353 AcpiGbl_RSDP = Address.Pointer.Logical; 354 } 355 356 /* The RDSP signature and checksum must both be correct */ 357 358 Status = AcpiTbValidateRsdp (AcpiGbl_RSDP); 359 if (ACPI_FAILURE (Status)) 360 { 361 return_ACPI_STATUS (Status); 362 } 363 } 364 365 /* Get the RSDT address via the RSDP */ 366 367 AcpiTbGetRsdtAddress (&Address); 368 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 369 "RSDP located at %p, RSDT physical=%8.8X%8.8X\n", 370 AcpiGbl_RSDP, 371 ACPI_FORMAT_UINT64 (Address.Pointer.Value))); 372 373 /* Insert ProcessorMode flags */ 374 375 Address.PointerType |= Flags; 376 377 /* Get and validate the RSDT */ 378 379 RsdtInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_TABLE_DESC)); 380 if (!RsdtInfo) 381 { 382 return_ACPI_STATUS (AE_NO_MEMORY); 383 } 384 385 Status = AcpiTbGetTable (&Address, RsdtInfo); 386 if (ACPI_FAILURE (Status)) 387 { 388 goto Cleanup; 389 } 390 391 Status = AcpiTbValidateRsdt (RsdtInfo->Pointer); 392 if (ACPI_FAILURE (Status)) 393 { 394 goto Cleanup; 395 } 396 397 /* Allocate a scratch table header and table descriptor */ 398 399 Header = ACPI_ALLOCATE (sizeof (ACPI_TABLE_HEADER)); 400 if (!Header) 401 { 402 Status = AE_NO_MEMORY; 403 goto Cleanup; 404 } 405 406 TableInfo = ACPI_ALLOCATE (sizeof (ACPI_TABLE_DESC)); 407 if (!TableInfo) 408 { 409 Status = AE_NO_MEMORY; 410 goto Cleanup; 411 } 412 413 /* Get the number of table pointers within the RSDT */ 414 415 TableCount = AcpiTbGetTableCount (AcpiGbl_RSDP, RsdtInfo->Pointer); 416 Address.PointerType = AcpiGbl_TableFlags | Flags; 417 418 /* 419 * Search the RSDT/XSDT for the correct instance of the 420 * requested table 421 */ 422 for (i = 0, j = 0; i < TableCount; i++) 423 { 424 /* 425 * Get the next table pointer, handle RSDT vs. XSDT 426 * RSDT pointers are 32 bits, XSDT pointers are 64 bits 427 */ 428 if (AcpiGbl_RootTableType == ACPI_TABLE_TYPE_RSDT) 429 { 430 Address.Pointer.Value = (ACPI_CAST_PTR ( 431 RSDT_DESCRIPTOR, RsdtInfo->Pointer))->TableOffsetEntry[i]; 432 } 433 else 434 { 435 Address.Pointer.Value = ACPI_GET_ADDRESS ((ACPI_CAST_PTR ( 436 XSDT_DESCRIPTOR, RsdtInfo->Pointer))->TableOffsetEntry[i]); 437 } 438 439 /* Get the table header */ 440 441 Status = AcpiTbGetTableHeader (&Address, Header); 442 if (ACPI_FAILURE (Status)) 443 { 444 goto Cleanup; 445 } 446 447 /* Compare table signatures and table instance */ 448 449 if (ACPI_COMPARE_NAME (Header->Signature, Signature)) 450 { 451 /* An instance of the table was found */ 452 453 j++; 454 if (j >= Instance) 455 { 456 /* Found the correct instance, get the entire table */ 457 458 Status = AcpiTbGetTableBody (&Address, Header, TableInfo); 459 if (ACPI_FAILURE (Status)) 460 { 461 goto Cleanup; 462 } 463 464 *TablePointer = TableInfo->Pointer; 465 goto Cleanup; 466 } 467 } 468 } 469 470 /* Did not find the table */ 471 472 Status = AE_NOT_EXIST; 473 474 475 Cleanup: 476 if (RsdtInfo->Pointer) 477 { 478 AcpiOsUnmapMemory (RsdtInfo->Pointer, 479 (ACPI_SIZE) RsdtInfo->Pointer->Length); 480 } 481 ACPI_FREE (RsdtInfo); 482 483 if (Header) 484 { 485 ACPI_FREE (Header); 486 } 487 if (TableInfo) 488 { 489 ACPI_FREE (TableInfo); 490 } 491 return_ACPI_STATUS (Status); 492 } 493 494 ACPI_EXPORT_SYMBOL (AcpiGetFirmwareTable) 495 496 497 /* TBD: Move to a new file */ 498 499 #if ACPI_MACHINE_WIDTH != 16 500 501 /******************************************************************************* 502 * 503 * FUNCTION: AcpiFindRootPointer 504 * 505 * PARAMETERS: Flags - Logical/Physical addressing 506 * RsdpAddress - Where to place the RSDP address 507 * 508 * RETURN: Status, Physical address of the RSDP 509 * 510 * DESCRIPTION: Find the RSDP 511 * 512 ******************************************************************************/ 513 514 ACPI_STATUS 515 AcpiFindRootPointer ( 516 UINT32 Flags, 517 ACPI_POINTER *RsdpAddress) 518 { 519 ACPI_TABLE_DESC TableInfo; 520 ACPI_STATUS Status; 521 522 523 ACPI_FUNCTION_TRACE (AcpiFindRootPointer); 524 525 526 /* Get the RSDP */ 527 528 Status = AcpiTbFindRsdp (&TableInfo, Flags); 529 if (ACPI_FAILURE (Status)) 530 { 531 ACPI_EXCEPTION ((AE_INFO, Status, 532 "RSDP structure not found - Flags=%X", Flags)); 533 534 return_ACPI_STATUS (AE_NO_ACPI_TABLES); 535 } 536 537 RsdpAddress->PointerType = ACPI_PHYSICAL_POINTER; 538 RsdpAddress->Pointer.Physical = TableInfo.PhysicalAddress; 539 return_ACPI_STATUS (AE_OK); 540 } 541 542 ACPI_EXPORT_SYMBOL (AcpiFindRootPointer) 543 544 545 /******************************************************************************* 546 * 547 * FUNCTION: AcpiTbScanMemoryForRsdp 548 * 549 * PARAMETERS: StartAddress - Starting pointer for search 550 * Length - Maximum length to search 551 * 552 * RETURN: Pointer to the RSDP if found, otherwise NULL. 553 * 554 * DESCRIPTION: Search a block of memory for the RSDP signature 555 * 556 ******************************************************************************/ 557 558 static UINT8 * 559 AcpiTbScanMemoryForRsdp ( 560 UINT8 *StartAddress, 561 UINT32 Length) 562 { 563 ACPI_STATUS Status; 564 UINT8 *MemRover; 565 UINT8 *EndAddress; 566 567 568 ACPI_FUNCTION_TRACE (TbScanMemoryForRsdp); 569 570 571 EndAddress = StartAddress + Length; 572 573 /* Search from given start address for the requested length */ 574 575 for (MemRover = StartAddress; MemRover < EndAddress; 576 MemRover += ACPI_RSDP_SCAN_STEP) 577 { 578 /* The RSDP signature and checksum must both be correct */ 579 580 Status = AcpiTbValidateRsdp (ACPI_CAST_PTR (RSDP_DESCRIPTOR, MemRover)); 581 if (ACPI_SUCCESS (Status)) 582 { 583 /* Sig and checksum valid, we have found a real RSDP */ 584 585 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 586 "RSDP located at physical address %p\n", MemRover)); 587 return_PTR (MemRover); 588 } 589 590 /* No sig match or bad checksum, keep searching */ 591 } 592 593 /* Searched entire block, no RSDP was found */ 594 595 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 596 "Searched entire block from %p, valid RSDP was not found\n", 597 StartAddress)); 598 return_PTR (NULL); 599 } 600 601 602 /******************************************************************************* 603 * 604 * FUNCTION: AcpiTbFindRsdp 605 * 606 * PARAMETERS: TableInfo - Where the table info is returned 607 * Flags - Current memory mode (logical vs. 608 * physical addressing) 609 * 610 * RETURN: Status, RSDP physical address 611 * 612 * DESCRIPTION: Search lower 1Mbyte of memory for the root system descriptor 613 * pointer structure. If it is found, set *RSDP to point to it. 614 * 615 * NOTE1: The RSDP must be either in the first 1K of the Extended 616 * BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.) 617 * Only a 32-bit physical address is necessary. 618 * 619 * NOTE2: This function is always available, regardless of the 620 * initialization state of the rest of ACPI. 621 * 622 ******************************************************************************/ 623 624 static ACPI_STATUS 625 AcpiTbFindRsdp ( 626 ACPI_TABLE_DESC *TableInfo, 627 UINT32 Flags) 628 { 629 UINT8 *TablePtr; 630 UINT8 *MemRover; 631 UINT32 PhysicalAddress; 632 ACPI_STATUS Status; 633 634 635 ACPI_FUNCTION_TRACE (TbFindRsdp); 636 637 638 /* 639 * Scan supports either logical addressing or physical addressing 640 */ 641 if ((Flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) 642 { 643 /* 1a) Get the location of the Extended BIOS Data Area (EBDA) */ 644 645 Status = AcpiOsMapMemory ( 646 (ACPI_PHYSICAL_ADDRESS) ACPI_EBDA_PTR_LOCATION, 647 ACPI_EBDA_PTR_LENGTH, (void *) &TablePtr); 648 if (ACPI_FAILURE (Status)) 649 { 650 ACPI_ERROR ((AE_INFO, 651 "Could not map memory at %8.8X for length %X", 652 ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH)); 653 654 return_ACPI_STATUS (Status); 655 } 656 657 ACPI_MOVE_16_TO_32 (&PhysicalAddress, TablePtr); 658 659 /* Convert segment part to physical address */ 660 661 PhysicalAddress <<= 4; 662 AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_PTR_LENGTH); 663 664 /* EBDA present? */ 665 666 if (PhysicalAddress > 0x400) 667 { 668 /* 669 * 1b) Search EBDA paragraphs (EBDA is required to be a 670 * minimum of 1K length) 671 */ 672 Status = AcpiOsMapMemory ( 673 (ACPI_PHYSICAL_ADDRESS) PhysicalAddress, 674 ACPI_EBDA_WINDOW_SIZE, (void *) &TablePtr); 675 if (ACPI_FAILURE (Status)) 676 { 677 ACPI_ERROR ((AE_INFO, 678 "Could not map memory at %8.8X for length %X", 679 PhysicalAddress, ACPI_EBDA_WINDOW_SIZE)); 680 681 return_ACPI_STATUS (Status); 682 } 683 684 MemRover = AcpiTbScanMemoryForRsdp (TablePtr, 685 ACPI_EBDA_WINDOW_SIZE); 686 AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_WINDOW_SIZE); 687 688 if (MemRover) 689 { 690 /* Return the physical address */ 691 692 PhysicalAddress += (UINT32) ACPI_PTR_DIFF (MemRover, TablePtr); 693 694 TableInfo->PhysicalAddress = 695 (ACPI_PHYSICAL_ADDRESS) PhysicalAddress; 696 return_ACPI_STATUS (AE_OK); 697 } 698 } 699 700 /* 701 * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh 702 */ 703 Status = AcpiOsMapMemory ( 704 (ACPI_PHYSICAL_ADDRESS) ACPI_HI_RSDP_WINDOW_BASE, 705 ACPI_HI_RSDP_WINDOW_SIZE, (void *) &TablePtr); 706 707 if (ACPI_FAILURE (Status)) 708 { 709 ACPI_ERROR ((AE_INFO, 710 "Could not map memory at %8.8X for length %X", 711 ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE)); 712 713 return_ACPI_STATUS (Status); 714 } 715 716 MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE); 717 AcpiOsUnmapMemory (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE); 718 719 if (MemRover) 720 { 721 /* Return the physical address */ 722 723 PhysicalAddress = (UINT32) 724 (ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (MemRover, TablePtr)); 725 726 TableInfo->PhysicalAddress = 727 (ACPI_PHYSICAL_ADDRESS) PhysicalAddress; 728 return_ACPI_STATUS (AE_OK); 729 } 730 } 731 732 /* 733 * Physical addressing 734 */ 735 else 736 { 737 /* 1a) Get the location of the EBDA */ 738 739 ACPI_MOVE_16_TO_32 (&PhysicalAddress, ACPI_EBDA_PTR_LOCATION); 740 PhysicalAddress <<= 4; /* Convert segment to physical address */ 741 742 /* EBDA present? */ 743 744 if (PhysicalAddress > 0x400) 745 { 746 /* 747 * 1b) Search EBDA paragraphs (EBDA is required to be a minimum of 748 * 1K length) 749 */ 750 MemRover = AcpiTbScanMemoryForRsdp ( 751 ACPI_PHYSADDR_TO_PTR (PhysicalAddress), 752 ACPI_EBDA_WINDOW_SIZE); 753 if (MemRover) 754 { 755 /* Return the physical address */ 756 757 TableInfo->PhysicalAddress = ACPI_TO_INTEGER (MemRover); 758 return_ACPI_STATUS (AE_OK); 759 } 760 } 761 762 /* 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh */ 763 764 MemRover = AcpiTbScanMemoryForRsdp ( 765 ACPI_PHYSADDR_TO_PTR (ACPI_HI_RSDP_WINDOW_BASE), 766 ACPI_HI_RSDP_WINDOW_SIZE); 767 if (MemRover) 768 { 769 /* Found it, return the physical address */ 770 771 TableInfo->PhysicalAddress = ACPI_TO_INTEGER (MemRover); 772 return_ACPI_STATUS (AE_OK); 773 } 774 } 775 776 /* A valid RSDP was not found */ 777 778 ACPI_ERROR ((AE_INFO, "No valid RSDP was found")); 779 return_ACPI_STATUS (AE_NOT_FOUND); 780 } 781 782 #endif 783 784