1 /******************************************************************************
3 * Module Name: tbutils - table utilities
5 *****************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp.
12 * All rights reserved.
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
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
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;
37 * The above copyright and patent license is granted only if the following
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.
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
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
72 * 3.4. Intel retains all right, title, and interest in and to the Original
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.
80 * 4. Disclaimer and Export Compliance
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
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
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.
114 *****************************************************************************/
116 #define __TBUTILS_C__
118 #include <contrib/dev/acpica/include/acpi.h>
119 #include <contrib/dev/acpica/include/accommon.h>
120 #include <contrib/dev/acpica/include/actables.h>
122 #define _COMPONENT ACPI_TABLES
123 ACPI_MODULE_NAME ("tbutils")
125 /* Local prototypes */
133 AcpiTbCleanupTableHeader (
134 ACPI_TABLE_HEADER *OutHeader,
135 ACPI_TABLE_HEADER *Header);
137 static ACPI_PHYSICAL_ADDRESS
138 AcpiTbGetRootTableEntry (
140 UINT32 TableEntrySize);
143 /*******************************************************************************
145 * FUNCTION: AcpiTbInitializeFacs
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
154 ******************************************************************************/
157 AcpiTbInitializeFacs (
163 Status = AcpiGetTableByIndex (ACPI_TABLE_INDEX_FACS,
164 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &AcpiGbl_FACS));
169 /*******************************************************************************
171 * FUNCTION: AcpiTbTablesLoaded
175 * RETURN: TRUE if required ACPI tables are loaded
177 * DESCRIPTION: Determine if the minimum required ACPI tables are present
180 ******************************************************************************/
187 if (AcpiGbl_RootTableList.Count >= 3)
196 /*******************************************************************************
198 * FUNCTION: AcpiTbFixString
200 * PARAMETERS: String - String to be repaired
201 * Length - Maximum length
205 * DESCRIPTION: Replace every non-printable or non-ascii byte in the string
206 * with a question mark '?'.
208 ******************************************************************************/
216 while (Length && *String)
218 if (!ACPI_IS_PRINT (*String))
228 /*******************************************************************************
230 * FUNCTION: AcpiTbCleanupTableHeader
232 * PARAMETERS: OutHeader - Where the cleaned header is returned
233 * Header - Input ACPI table header
235 * RETURN: Returns the cleaned header in OutHeader
237 * DESCRIPTION: Copy the table header and ensure that all "string" fields in
238 * the header consist of printable characters.
240 ******************************************************************************/
243 AcpiTbCleanupTableHeader (
244 ACPI_TABLE_HEADER *OutHeader,
245 ACPI_TABLE_HEADER *Header)
248 ACPI_MEMCPY (OutHeader, Header, sizeof (ACPI_TABLE_HEADER));
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);
257 /*******************************************************************************
259 * FUNCTION: AcpiTbPrintTableHeader
261 * PARAMETERS: Address - Table physical address
262 * Header - Table header
266 * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.
268 ******************************************************************************/
271 AcpiTbPrintTableHeader (
272 ACPI_PHYSICAL_ADDRESS Address,
273 ACPI_TABLE_HEADER *Header)
275 ACPI_TABLE_HEADER LocalHeader;
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.
282 if (ACPI_COMPARE_NAME (Header->Signature, ACPI_SIG_FACS))
284 /* FACS only has signature and length fields */
286 ACPI_INFO ((AE_INFO, "%4.4s %p %05X",
287 Header->Signature, ACPI_CAST_PTR (void, Address),
290 else if (ACPI_COMPARE_NAME (Header->Signature, ACPI_SIG_RSDP))
292 /* RSDP has no common fields */
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);
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,
307 /* Standard ACPI table with full common header */
309 AcpiTbCleanupTableHeader (&LocalHeader, Header);
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));
321 /*******************************************************************************
323 * FUNCTION: AcpiTbValidateChecksum
325 * PARAMETERS: Table - ACPI table to verify
326 * Length - Length of entire table
330 * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
331 * exception on bad checksum.
333 ******************************************************************************/
336 AcpiTbVerifyChecksum (
337 ACPI_TABLE_HEADER *Table,
343 /* Compute the checksum on the table */
345 Checksum = AcpiTbChecksum (ACPI_CAST_PTR (UINT8, Table), Length);
347 /* Checksum ok? (should be zero) */
351 ACPI_WARNING ((AE_INFO,
352 "Incorrect checksum in table [%4.4s] - 0x%2.2X, should be 0x%2.2X",
353 Table->Signature, Table->Checksum,
354 (UINT8) (Table->Checksum - Checksum)));
356 #if (ACPI_CHECKSUM_ABORT)
357 return (AE_BAD_CHECKSUM);
365 /*******************************************************************************
367 * FUNCTION: AcpiTbChecksum
369 * PARAMETERS: Buffer - Pointer to memory region to be checked
370 * Length - Length of this memory region
372 * RETURN: Checksum (UINT8)
374 * DESCRIPTION: Calculates circular checksum of memory region.
376 ******************************************************************************/
384 UINT8 *End = Buffer + Length;
389 Sum = (UINT8) (Sum + *(Buffer++));
396 /*******************************************************************************
398 * FUNCTION: AcpiTbCheckDsdtHeader
404 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
405 * if the DSDT has been replaced from outside the OS and/or if
406 * the DSDT header has been corrupted.
408 ******************************************************************************/
411 AcpiTbCheckDsdtHeader (
415 /* Compare original length and checksum to current values */
417 if (AcpiGbl_OriginalDsdtHeader.Length != AcpiGbl_DSDT->Length ||
418 AcpiGbl_OriginalDsdtHeader.Checksum != AcpiGbl_DSDT->Checksum)
420 ACPI_ERROR ((AE_INFO,
421 "The DSDT has been corrupted or replaced - old, new headers below"));
422 AcpiTbPrintTableHeader (0, &AcpiGbl_OriginalDsdtHeader);
423 AcpiTbPrintTableHeader (0, AcpiGbl_DSDT);
425 /* Disable further error messages */
427 AcpiGbl_OriginalDsdtHeader.Length = AcpiGbl_DSDT->Length;
428 AcpiGbl_OriginalDsdtHeader.Checksum = AcpiGbl_DSDT->Checksum;
433 /*******************************************************************************
435 * FUNCTION: AcpiTbCopyDsdt
437 * PARAMETERS: TableDesc - Installed table to copy
441 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
442 * Some very bad BIOSs are known to either corrupt the DSDT or
443 * install a new, bad DSDT. This copy works around the problem.
445 ******************************************************************************/
451 ACPI_TABLE_HEADER *NewTable;
452 ACPI_TABLE_DESC *TableDesc;
455 TableDesc = &AcpiGbl_RootTableList.Tables[TableIndex];
457 NewTable = ACPI_ALLOCATE (TableDesc->Length);
460 ACPI_ERROR ((AE_INFO, "Could not copy DSDT of length 0x%X",
465 ACPI_MEMCPY (NewTable, TableDesc->Pointer, TableDesc->Length);
466 AcpiTbDeleteTable (TableDesc);
467 TableDesc->Pointer = NewTable;
468 TableDesc->Flags = ACPI_TABLE_ORIGIN_ALLOCATED;
471 "Forced DSDT copy: length 0x%05X copied locally, original unmapped",
478 /*******************************************************************************
480 * FUNCTION: AcpiTbInstallTable
482 * PARAMETERS: Address - Physical address of DSDT or FACS
483 * Signature - Table signature, NULL if no need to
485 * TableIndex - Index into root table array
489 * DESCRIPTION: Install an ACPI table into the global data structure. The
490 * table override mechanism is implemented here to allow the host
491 * OS to replace any table before it is installed in the root
494 ******************************************************************************/
498 ACPI_PHYSICAL_ADDRESS Address,
504 ACPI_TABLE_HEADER *TableToInstall;
505 ACPI_TABLE_HEADER *MappedTable;
506 ACPI_TABLE_HEADER *OverrideTable = NULL;
511 ACPI_ERROR ((AE_INFO, "Null physical address for ACPI table [%s]",
516 /* Map just the table header */
518 MappedTable = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));
524 /* Skip SSDT when DSDT is overriden */
526 if (ACPI_COMPARE_NAME (MappedTable->Signature, ACPI_SIG_SSDT) &&
527 (AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Flags &
528 ACPI_TABLE_ORIGIN_OVERRIDE))
531 "%4.4s @ 0x%p Table override, replaced with:", ACPI_SIG_SSDT,
532 ACPI_CAST_PTR (void, Address)));
533 AcpiTbPrintTableHeader (
534 AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Address,
535 AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Pointer);
539 /* If a particular signature is expected (DSDT/FACS), it must match */
542 !ACPI_COMPARE_NAME (MappedTable->Signature, Signature))
544 ACPI_ERROR ((AE_INFO,
545 "Invalid signature 0x%X for ACPI table, expected [%s]",
546 *ACPI_CAST_PTR (UINT32, MappedTable->Signature), Signature));
551 * ACPI Table Override:
553 * Before we install the table, let the host OS override it with a new
554 * one if desired. Any table within the RSDT/XSDT can be replaced,
555 * including the DSDT which is pointed to by the FADT.
557 Status = AcpiOsTableOverride (MappedTable, &OverrideTable);
558 if (ACPI_SUCCESS (Status) && OverrideTable)
561 "%4.4s @ 0x%p Table override, replaced with:",
562 MappedTable->Signature, ACPI_CAST_PTR (void, Address)));
564 AcpiGbl_RootTableList.Tables[TableIndex].Pointer = OverrideTable;
565 Address = ACPI_PTR_TO_PHYSADDR (OverrideTable);
567 TableToInstall = OverrideTable;
568 Flags = ACPI_TABLE_ORIGIN_OVERRIDE;
572 TableToInstall = MappedTable;
573 Flags = ACPI_TABLE_ORIGIN_MAPPED;
576 /* Initialize the table entry */
578 AcpiGbl_RootTableList.Tables[TableIndex].Address = Address;
579 AcpiGbl_RootTableList.Tables[TableIndex].Length = TableToInstall->Length;
580 AcpiGbl_RootTableList.Tables[TableIndex].Flags = Flags;
583 &(AcpiGbl_RootTableList.Tables[TableIndex].Signature),
584 TableToInstall->Signature);
586 AcpiTbPrintTableHeader (Address, TableToInstall);
588 if (TableIndex == ACPI_TABLE_INDEX_DSDT)
590 /* Global integer width is based upon revision of the DSDT */
592 AcpiUtSetIntegerWidth (TableToInstall->Revision);
596 AcpiOsUnmapMemory (MappedTable, sizeof (ACPI_TABLE_HEADER));
600 /*******************************************************************************
602 * FUNCTION: AcpiTbGetRootTableEntry
604 * PARAMETERS: TableEntry - Pointer to the RSDT/XSDT table entry
605 * TableEntrySize - sizeof 32 or 64 (RSDT or XSDT)
607 * RETURN: Physical address extracted from the root table
609 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
610 * both 32-bit and 64-bit platforms
612 * NOTE: ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on
615 ******************************************************************************/
617 static ACPI_PHYSICAL_ADDRESS
618 AcpiTbGetRootTableEntry (
620 UINT32 TableEntrySize)
626 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
627 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
629 if (TableEntrySize == sizeof (UINT32))
632 * 32-bit platform, RSDT: Return 32-bit table entry
633 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
635 return ((ACPI_PHYSICAL_ADDRESS) (*ACPI_CAST_PTR (UINT32, TableEntry)));
640 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
641 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
644 ACPI_MOVE_64_TO_64 (&Address64, TableEntry);
646 #if ACPI_MACHINE_WIDTH == 32
647 if (Address64 > ACPI_UINT32_MAX)
649 /* Will truncate 64-bit address to 32 bits, issue warning */
651 ACPI_WARNING ((AE_INFO,
652 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
654 ACPI_FORMAT_UINT64 (Address64)));
657 return ((ACPI_PHYSICAL_ADDRESS) (Address64));
662 /*******************************************************************************
664 * FUNCTION: AcpiTbParseRootTable
666 * PARAMETERS: Rsdp - Pointer to the RSDP
670 * DESCRIPTION: This function is called to parse the Root System Description
671 * Table (RSDT or XSDT)
673 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
674 * be mapped and cannot be copied because it contains the actual
675 * memory location of the ACPI Global Lock.
677 ******************************************************************************/
680 AcpiTbParseRootTable (
681 ACPI_PHYSICAL_ADDRESS RsdpAddress)
683 ACPI_TABLE_RSDP *Rsdp;
684 UINT32 TableEntrySize;
687 ACPI_TABLE_HEADER *Table;
688 ACPI_PHYSICAL_ADDRESS Address;
694 ACPI_FUNCTION_TRACE (TbParseRootTable);
698 * Map the entire RSDP and extract the address of the RSDT or XSDT
700 Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP));
703 return_ACPI_STATUS (AE_NO_MEMORY);
706 AcpiTbPrintTableHeader (RsdpAddress,
707 ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp));
709 /* Differentiate between RSDT and XSDT root tables */
711 if (Rsdp->Revision > 1 && Rsdp->XsdtPhysicalAddress)
714 * Root table is an XSDT (64-bit physical addresses). We must use the
715 * XSDT if the revision is > 1 and the XSDT pointer is present, as per
716 * the ACPI specification.
718 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress;
719 TableEntrySize = sizeof (UINT64);
723 /* Root table is an RSDT (32-bit physical addresses) */
725 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress;
726 TableEntrySize = sizeof (UINT32);
730 * It is not possible to map more than one entry in some environments,
731 * so unmap the RSDP here before mapping other tables
733 AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP));
736 /* Map the RSDT/XSDT table header to get the full table length */
738 Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));
741 return_ACPI_STATUS (AE_NO_MEMORY);
744 AcpiTbPrintTableHeader (Address, Table);
746 /* Get the length of the full table, verify length and map entire table */
748 Length = Table->Length;
749 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
751 if (Length < sizeof (ACPI_TABLE_HEADER))
753 ACPI_ERROR ((AE_INFO, "Invalid length 0x%X in RSDT/XSDT", Length));
754 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
757 Table = AcpiOsMapMemory (Address, Length);
760 return_ACPI_STATUS (AE_NO_MEMORY);
763 /* Validate the root table checksum */
765 Status = AcpiTbVerifyChecksum (Table, Length);
766 if (ACPI_FAILURE (Status))
768 AcpiOsUnmapMemory (Table, Length);
769 return_ACPI_STATUS (Status);
772 /* Calculate the number of tables described in the root table */
774 TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) /
778 * First two entries in the table array are reserved for the DSDT
779 * and FACS, which are not actually present in the RSDT/XSDT - they
782 TableEntry = ACPI_CAST_PTR (UINT8, Table) + sizeof (ACPI_TABLE_HEADER);
783 AcpiGbl_RootTableList.Count = 2;
786 * Initialize the root table array from the RSDT/XSDT
788 for (i = 0; i < TableCount; i++)
790 if (AcpiGbl_RootTableList.Count >= AcpiGbl_RootTableList.Size)
792 /* There is no more room in the root table array, attempt resize */
794 Status = AcpiTbResizeRootTableList ();
795 if (ACPI_FAILURE (Status))
797 ACPI_WARNING ((AE_INFO, "Truncating %u table entries!",
798 (unsigned) (TableCount -
799 (AcpiGbl_RootTableList.Count - 2))));
804 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
806 AcpiGbl_RootTableList.Tables[AcpiGbl_RootTableList.Count].Address =
807 AcpiTbGetRootTableEntry (TableEntry, TableEntrySize);
809 TableEntry += TableEntrySize;
810 AcpiGbl_RootTableList.Count++;
814 * It is not possible to map more than one entry in some environments,
815 * so unmap the root table here before mapping other tables
817 AcpiOsUnmapMemory (Table, Length);
820 * Complete the initialization of the root table array by examining
821 * the header of each table
823 for (i = 2; i < AcpiGbl_RootTableList.Count; i++)
825 AcpiTbInstallTable (AcpiGbl_RootTableList.Tables[i].Address,
828 /* Special case for FADT - get the DSDT and FACS */
830 if (ACPI_COMPARE_NAME (
831 &AcpiGbl_RootTableList.Tables[i].Signature, ACPI_SIG_FADT))
837 return_ACPI_STATUS (AE_OK);