1 /******************************************************************************
3 * Module Name: tbutils - ACPI Table utilities
5 *****************************************************************************/
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50 #define _COMPONENT ACPI_TABLES
51 ACPI_MODULE_NAME ("tbutils")
54 /* Local prototypes */
58 ACPI_PHYSICAL_ADDRESS Address);
60 static ACPI_PHYSICAL_ADDRESS
61 AcpiTbGetRootTableEntry (
63 UINT32 TableEntrySize);
66 #if (!ACPI_REDUCED_HARDWARE)
67 /*******************************************************************************
69 * FUNCTION: AcpiTbInitializeFacs
75 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
76 * for accessing the Global Lock and Firmware Waking Vector
78 ******************************************************************************/
81 AcpiTbInitializeFacs (
87 /* If Hardware Reduced flag is set, there is no FACS */
89 if (AcpiGbl_ReducedHardware)
95 Status = AcpiGetTableByIndex (ACPI_TABLE_INDEX_FACS,
96 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &AcpiGbl_FACS));
99 #endif /* !ACPI_REDUCED_HARDWARE */
102 /*******************************************************************************
104 * FUNCTION: AcpiTbTablesLoaded
108 * RETURN: TRUE if required ACPI tables are loaded
110 * DESCRIPTION: Determine if the minimum required ACPI tables are present
113 ******************************************************************************/
120 if (AcpiGbl_RootTableList.CurrentTableCount >= 3)
129 /*******************************************************************************
131 * FUNCTION: AcpiTbCheckDsdtHeader
137 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
138 * if the DSDT has been replaced from outside the OS and/or if
139 * the DSDT header has been corrupted.
141 ******************************************************************************/
144 AcpiTbCheckDsdtHeader (
148 /* Compare original length and checksum to current values */
150 if (AcpiGbl_OriginalDsdtHeader.Length != AcpiGbl_DSDT->Length ||
151 AcpiGbl_OriginalDsdtHeader.Checksum != AcpiGbl_DSDT->Checksum)
153 ACPI_BIOS_ERROR ((AE_INFO,
154 "The DSDT has been corrupted or replaced - "
155 "old, new headers below"));
156 AcpiTbPrintTableHeader (0, &AcpiGbl_OriginalDsdtHeader);
157 AcpiTbPrintTableHeader (0, AcpiGbl_DSDT);
159 /* Disable further error messages */
161 AcpiGbl_OriginalDsdtHeader.Length = AcpiGbl_DSDT->Length;
162 AcpiGbl_OriginalDsdtHeader.Checksum = AcpiGbl_DSDT->Checksum;
167 /*******************************************************************************
169 * FUNCTION: AcpiTbCopyDsdt
171 * PARAMETERS: TableDesc - Installed table to copy
175 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
176 * Some very bad BIOSs are known to either corrupt the DSDT or
177 * install a new, bad DSDT. This copy works around the problem.
179 ******************************************************************************/
185 ACPI_TABLE_HEADER *NewTable;
186 ACPI_TABLE_DESC *TableDesc;
189 TableDesc = &AcpiGbl_RootTableList.Tables[TableIndex];
191 NewTable = ACPI_ALLOCATE (TableDesc->Length);
194 ACPI_ERROR ((AE_INFO, "Could not copy DSDT of length 0x%X",
199 ACPI_MEMCPY (NewTable, TableDesc->Pointer, TableDesc->Length);
200 AcpiTbDeleteTable (TableDesc);
201 TableDesc->Pointer = NewTable;
202 TableDesc->Flags = ACPI_TABLE_ORIGIN_ALLOCATED;
205 "Forced DSDT copy: length 0x%05X copied locally, original unmapped",
212 /*******************************************************************************
214 * FUNCTION: AcpiTbInstallTable
216 * PARAMETERS: Address - Physical address of DSDT or FACS
217 * Signature - Table signature, NULL if no need to
219 * TableIndex - Index into root table array
223 * DESCRIPTION: Install an ACPI table into the global data structure. The
224 * table override mechanism is called to allow the host
225 * OS to replace any table before it is installed in the root
228 ******************************************************************************/
232 ACPI_PHYSICAL_ADDRESS Address,
236 ACPI_TABLE_HEADER *Table;
237 ACPI_TABLE_HEADER *FinalTable;
238 ACPI_TABLE_DESC *TableDesc;
243 ACPI_ERROR ((AE_INFO, "Null physical address for ACPI table [%s]",
248 /* Map just the table header */
250 Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));
253 ACPI_ERROR ((AE_INFO, "Could not map memory for table [%s] at %p",
254 Signature, ACPI_CAST_PTR (void, Address)));
258 /* If a particular signature is expected (DSDT/FACS), it must match */
261 !ACPI_COMPARE_NAME (Table->Signature, Signature))
263 ACPI_BIOS_ERROR ((AE_INFO,
264 "Invalid signature 0x%X for ACPI table, expected [%s]",
265 *ACPI_CAST_PTR (UINT32, Table->Signature), Signature));
270 * Initialize the table entry. Set the pointer to NULL, since the
271 * table is not fully mapped at this time.
273 TableDesc = &AcpiGbl_RootTableList.Tables[TableIndex];
275 TableDesc->Address = Address;
276 TableDesc->Pointer = NULL;
277 TableDesc->Length = Table->Length;
278 TableDesc->Flags = ACPI_TABLE_ORIGIN_MAPPED;
279 ACPI_MOVE_32_TO_32 (TableDesc->Signature.Ascii, Table->Signature);
282 * ACPI Table Override:
284 * Before we install the table, let the host OS override it with a new
285 * one if desired. Any table within the RSDT/XSDT can be replaced,
286 * including the DSDT which is pointed to by the FADT.
288 * NOTE: If the table is overridden, then FinalTable will contain a
289 * mapped pointer to the full new table. If the table is not overridden,
290 * or if there has been a physical override, then the table will be
291 * fully mapped later (in verify table). In any case, we must
292 * unmap the header that was mapped above.
294 FinalTable = AcpiTbTableOverride (Table, TableDesc);
297 FinalTable = Table; /* There was no override */
300 AcpiTbPrintTableHeader (TableDesc->Address, FinalTable);
302 /* Set the global integer width (based upon revision of the DSDT) */
304 if (TableIndex == ACPI_TABLE_INDEX_DSDT)
306 AcpiUtSetIntegerWidth (FinalTable->Revision);
310 * If we have a physical override during this early loading of the ACPI
311 * tables, unmap the table for now. It will be mapped again later when
312 * it is actually used. This supports very early loading of ACPI tables,
313 * before virtual memory is fully initialized and running within the
314 * host OS. Note: A logical override has the ACPI_TABLE_ORIGIN_OVERRIDE
315 * flag set and will not be deleted below.
317 if (FinalTable != Table)
319 AcpiTbDeleteTable (TableDesc);
325 /* Always unmap the table header that we mapped above */
327 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
331 /*******************************************************************************
333 * FUNCTION: AcpiTbGetRootTableEntry
335 * PARAMETERS: TableEntry - Pointer to the RSDT/XSDT table entry
336 * TableEntrySize - sizeof 32 or 64 (RSDT or XSDT)
338 * RETURN: Physical address extracted from the root table
340 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
341 * both 32-bit and 64-bit platforms
343 * NOTE: ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on
346 ******************************************************************************/
348 static ACPI_PHYSICAL_ADDRESS
349 AcpiTbGetRootTableEntry (
351 UINT32 TableEntrySize)
357 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
358 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
360 if (TableEntrySize == ACPI_RSDT_ENTRY_SIZE)
363 * 32-bit platform, RSDT: Return 32-bit table entry
364 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
366 return ((ACPI_PHYSICAL_ADDRESS) (*ACPI_CAST_PTR (UINT32, TableEntry)));
371 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
372 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
375 ACPI_MOVE_64_TO_64 (&Address64, TableEntry);
377 #if ACPI_MACHINE_WIDTH == 32
378 if (Address64 > ACPI_UINT32_MAX)
380 /* Will truncate 64-bit address to 32 bits, issue warning */
382 ACPI_BIOS_WARNING ((AE_INFO,
383 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
385 ACPI_FORMAT_UINT64 (Address64)));
388 return ((ACPI_PHYSICAL_ADDRESS) (Address64));
393 /*******************************************************************************
395 * FUNCTION: AcpiTbValidateXsdt
397 * PARAMETERS: Address - Physical address of the XSDT (from RSDP)
399 * RETURN: Status. AE_OK if the table appears to be valid.
401 * DESCRIPTION: Validate an XSDT to ensure that it is of minimum size and does
402 * not contain any NULL entries. A problem that is seen in the
403 * field is that the XSDT exists, but is actually useless because
404 * of one or more (or all) NULL entries.
406 ******************************************************************************/
410 ACPI_PHYSICAL_ADDRESS XsdtAddress)
412 ACPI_TABLE_HEADER *Table;
414 ACPI_PHYSICAL_ADDRESS Address;
421 /* Get the XSDT length */
423 Table = AcpiOsMapMemory (XsdtAddress, sizeof (ACPI_TABLE_HEADER));
426 return (AE_NO_MEMORY);
429 Length = Table->Length;
430 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
433 * Minimum XSDT length is the size of the standard ACPI header
434 * plus one physical address entry
436 if (Length < (sizeof (ACPI_TABLE_HEADER) + ACPI_XSDT_ENTRY_SIZE))
438 return (AE_INVALID_TABLE_LENGTH);
441 /* Map the entire XSDT */
443 Table = AcpiOsMapMemory (XsdtAddress, Length);
446 return (AE_NO_MEMORY);
449 /* Get the number of entries and pointer to first entry */
452 NextEntry = ACPI_ADD_PTR (UINT8, Table, sizeof (ACPI_TABLE_HEADER));
453 EntryCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) /
454 ACPI_XSDT_ENTRY_SIZE);
456 /* Validate each entry (physical address) within the XSDT */
458 for (i = 0; i < EntryCount; i++)
460 Address = AcpiTbGetRootTableEntry (NextEntry, ACPI_XSDT_ENTRY_SIZE);
463 /* Detected a NULL entry, XSDT is invalid */
465 Status = AE_NULL_ENTRY;
469 NextEntry += ACPI_XSDT_ENTRY_SIZE;
474 AcpiOsUnmapMemory (Table, Length);
479 /*******************************************************************************
481 * FUNCTION: AcpiTbParseRootTable
483 * PARAMETERS: Rsdp - Pointer to the RSDP
487 * DESCRIPTION: This function is called to parse the Root System Description
488 * Table (RSDT or XSDT)
490 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
491 * be mapped and cannot be copied because it contains the actual
492 * memory location of the ACPI Global Lock.
494 ******************************************************************************/
497 AcpiTbParseRootTable (
498 ACPI_PHYSICAL_ADDRESS RsdpAddress)
500 ACPI_TABLE_RSDP *Rsdp;
501 UINT32 TableEntrySize;
504 ACPI_TABLE_HEADER *Table;
505 ACPI_PHYSICAL_ADDRESS Address;
511 ACPI_FUNCTION_TRACE (TbParseRootTable);
514 /* Map the entire RSDP and extract the address of the RSDT or XSDT */
516 Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP));
519 return_ACPI_STATUS (AE_NO_MEMORY);
522 AcpiTbPrintTableHeader (RsdpAddress,
523 ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp));
525 /* Use XSDT if present and not overridden. Otherwise, use RSDT */
527 if ((Rsdp->Revision > 1) &&
528 Rsdp->XsdtPhysicalAddress &&
529 !AcpiGbl_DoNotUseXsdt)
532 * RSDP contains an XSDT (64-bit physical addresses). We must use
533 * the XSDT if the revision is > 1 and the XSDT pointer is present,
534 * as per the ACPI specification.
536 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress;
537 TableEntrySize = ACPI_XSDT_ENTRY_SIZE;
541 /* Root table is an RSDT (32-bit physical addresses) */
543 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress;
544 TableEntrySize = ACPI_RSDT_ENTRY_SIZE;
548 * It is not possible to map more than one entry in some environments,
549 * so unmap the RSDP here before mapping other tables
551 AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP));
554 * If it is present and used, validate the XSDT for access/size
555 * and ensure that all table entries are at least non-NULL
557 if (TableEntrySize == ACPI_XSDT_ENTRY_SIZE)
559 Status = AcpiTbValidateXsdt (Address);
560 if (ACPI_FAILURE (Status))
562 ACPI_BIOS_WARNING ((AE_INFO, "XSDT is invalid (%s), using RSDT",
563 AcpiFormatException (Status)));
565 /* Fall back to the RSDT */
567 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress;
568 TableEntrySize = ACPI_RSDT_ENTRY_SIZE;
572 /* Map the RSDT/XSDT table header to get the full table length */
574 Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));
577 return_ACPI_STATUS (AE_NO_MEMORY);
580 AcpiTbPrintTableHeader (Address, Table);
583 * Validate length of the table, and map entire table.
584 * Minimum length table must contain at least one entry.
586 Length = Table->Length;
587 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
589 if (Length < (sizeof (ACPI_TABLE_HEADER) + TableEntrySize))
591 ACPI_BIOS_ERROR ((AE_INFO,
592 "Invalid table length 0x%X in RSDT/XSDT", Length));
593 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
596 Table = AcpiOsMapMemory (Address, Length);
599 return_ACPI_STATUS (AE_NO_MEMORY);
602 /* Validate the root table checksum */
604 Status = AcpiTbVerifyChecksum (Table, Length);
605 if (ACPI_FAILURE (Status))
607 AcpiOsUnmapMemory (Table, Length);
608 return_ACPI_STATUS (Status);
611 /* Get the number of entries and pointer to first entry */
613 TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) /
615 TableEntry = ACPI_ADD_PTR (UINT8, Table, sizeof (ACPI_TABLE_HEADER));
618 * First two entries in the table array are reserved for the DSDT
619 * and FACS, which are not actually present in the RSDT/XSDT - they
622 AcpiGbl_RootTableList.CurrentTableCount = 2;
624 /* Initialize the root table array from the RSDT/XSDT */
626 for (i = 0; i < TableCount; i++)
628 if (AcpiGbl_RootTableList.CurrentTableCount >=
629 AcpiGbl_RootTableList.MaxTableCount)
631 /* There is no more room in the root table array, attempt resize */
633 Status = AcpiTbResizeRootTableList ();
634 if (ACPI_FAILURE (Status))
636 ACPI_WARNING ((AE_INFO, "Truncating %u table entries!",
637 (unsigned) (TableCount -
638 (AcpiGbl_RootTableList.CurrentTableCount - 2))));
643 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
645 AcpiGbl_RootTableList.Tables[AcpiGbl_RootTableList.CurrentTableCount].Address =
646 AcpiTbGetRootTableEntry (TableEntry, TableEntrySize);
648 TableEntry += TableEntrySize;
649 AcpiGbl_RootTableList.CurrentTableCount++;
653 * It is not possible to map more than one entry in some environments,
654 * so unmap the root table here before mapping other tables
656 AcpiOsUnmapMemory (Table, Length);
659 * Complete the initialization of the root table array by examining
660 * the header of each table
662 for (i = 2; i < AcpiGbl_RootTableList.CurrentTableCount; i++)
664 AcpiTbInstallTable (AcpiGbl_RootTableList.Tables[i].Address,
667 /* Special case for FADT - validate it then get the DSDT and FACS */
669 if (ACPI_COMPARE_NAME (
670 &AcpiGbl_RootTableList.Tables[i].Signature, ACPI_SIG_FADT))
676 return_ACPI_STATUS (AE_OK);