1 /******************************************************************************
3 * Module Name: tbutils - ACPI Table utilities
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2014, Intel Corp.
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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 AcpiTbUninstallTable (TableDesc);
202 AcpiTbInitTableDescriptor (
203 &AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT],
204 ACPI_PTR_TO_PHYSADDR (NewTable), ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
208 "Forced DSDT copy: length 0x%05X copied locally, original unmapped",
215 /*******************************************************************************
217 * FUNCTION: AcpiTbGetRootTableEntry
219 * PARAMETERS: TableEntry - Pointer to the RSDT/XSDT table entry
220 * TableEntrySize - sizeof 32 or 64 (RSDT or XSDT)
222 * RETURN: Physical address extracted from the root table
224 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
225 * both 32-bit and 64-bit platforms
227 * NOTE: ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on
230 ******************************************************************************/
232 static ACPI_PHYSICAL_ADDRESS
233 AcpiTbGetRootTableEntry (
235 UINT32 TableEntrySize)
241 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
242 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
244 if (TableEntrySize == ACPI_RSDT_ENTRY_SIZE)
247 * 32-bit platform, RSDT: Return 32-bit table entry
248 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
250 return ((ACPI_PHYSICAL_ADDRESS) (*ACPI_CAST_PTR (UINT32, TableEntry)));
255 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
256 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
259 ACPI_MOVE_64_TO_64 (&Address64, TableEntry);
261 #if ACPI_MACHINE_WIDTH == 32
262 if (Address64 > ACPI_UINT32_MAX)
264 /* Will truncate 64-bit address to 32 bits, issue warning */
266 ACPI_BIOS_WARNING ((AE_INFO,
267 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
269 ACPI_FORMAT_UINT64 (Address64)));
272 return ((ACPI_PHYSICAL_ADDRESS) (Address64));
277 /*******************************************************************************
279 * FUNCTION: AcpiTbValidateXsdt
281 * PARAMETERS: Address - Physical address of the XSDT (from RSDP)
283 * RETURN: Status. AE_OK if the table appears to be valid.
285 * DESCRIPTION: Validate an XSDT to ensure that it is of minimum size and does
286 * not contain any NULL entries. A problem that is seen in the
287 * field is that the XSDT exists, but is actually useless because
288 * of one or more (or all) NULL entries.
290 ******************************************************************************/
294 ACPI_PHYSICAL_ADDRESS XsdtAddress)
296 ACPI_TABLE_HEADER *Table;
298 ACPI_PHYSICAL_ADDRESS Address;
305 /* Get the XSDT length */
307 Table = AcpiOsMapMemory (XsdtAddress, sizeof (ACPI_TABLE_HEADER));
310 return (AE_NO_MEMORY);
313 Length = Table->Length;
314 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
317 * Minimum XSDT length is the size of the standard ACPI header
318 * plus one physical address entry
320 if (Length < (sizeof (ACPI_TABLE_HEADER) + ACPI_XSDT_ENTRY_SIZE))
322 return (AE_INVALID_TABLE_LENGTH);
325 /* Map the entire XSDT */
327 Table = AcpiOsMapMemory (XsdtAddress, Length);
330 return (AE_NO_MEMORY);
333 /* Get the number of entries and pointer to first entry */
336 NextEntry = ACPI_ADD_PTR (UINT8, Table, sizeof (ACPI_TABLE_HEADER));
337 EntryCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) /
338 ACPI_XSDT_ENTRY_SIZE);
340 /* Validate each entry (physical address) within the XSDT */
342 for (i = 0; i < EntryCount; i++)
344 Address = AcpiTbGetRootTableEntry (NextEntry, ACPI_XSDT_ENTRY_SIZE);
347 /* Detected a NULL entry, XSDT is invalid */
349 Status = AE_NULL_ENTRY;
353 NextEntry += ACPI_XSDT_ENTRY_SIZE;
358 AcpiOsUnmapMemory (Table, Length);
363 /*******************************************************************************
365 * FUNCTION: AcpiTbParseRootTable
367 * PARAMETERS: Rsdp - Pointer to the RSDP
371 * DESCRIPTION: This function is called to parse the Root System Description
372 * Table (RSDT or XSDT)
374 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
375 * be mapped and cannot be copied because it contains the actual
376 * memory location of the ACPI Global Lock.
378 ******************************************************************************/
381 AcpiTbParseRootTable (
382 ACPI_PHYSICAL_ADDRESS RsdpAddress)
384 ACPI_TABLE_RSDP *Rsdp;
385 UINT32 TableEntrySize;
388 ACPI_TABLE_HEADER *Table;
389 ACPI_PHYSICAL_ADDRESS Address;
396 ACPI_FUNCTION_TRACE (TbParseRootTable);
399 /* Map the entire RSDP and extract the address of the RSDT or XSDT */
401 Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP));
404 return_ACPI_STATUS (AE_NO_MEMORY);
407 AcpiTbPrintTableHeader (RsdpAddress,
408 ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp));
410 /* Use XSDT if present and not overridden. Otherwise, use RSDT */
412 if ((Rsdp->Revision > 1) &&
413 Rsdp->XsdtPhysicalAddress &&
414 !AcpiGbl_DoNotUseXsdt)
417 * RSDP contains an XSDT (64-bit physical addresses). We must use
418 * the XSDT if the revision is > 1 and the XSDT pointer is present,
419 * as per the ACPI specification.
421 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress;
422 TableEntrySize = ACPI_XSDT_ENTRY_SIZE;
426 /* Root table is an RSDT (32-bit physical addresses) */
428 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress;
429 TableEntrySize = ACPI_RSDT_ENTRY_SIZE;
433 * It is not possible to map more than one entry in some environments,
434 * so unmap the RSDP here before mapping other tables
436 AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP));
439 * If it is present and used, validate the XSDT for access/size
440 * and ensure that all table entries are at least non-NULL
442 if (TableEntrySize == ACPI_XSDT_ENTRY_SIZE)
444 Status = AcpiTbValidateXsdt (Address);
445 if (ACPI_FAILURE (Status))
447 ACPI_BIOS_WARNING ((AE_INFO, "XSDT is invalid (%s), using RSDT",
448 AcpiFormatException (Status)));
450 /* Fall back to the RSDT */
452 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress;
453 TableEntrySize = ACPI_RSDT_ENTRY_SIZE;
457 /* Map the RSDT/XSDT table header to get the full table length */
459 Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));
462 return_ACPI_STATUS (AE_NO_MEMORY);
465 AcpiTbPrintTableHeader (Address, Table);
468 * Validate length of the table, and map entire table.
469 * Minimum length table must contain at least one entry.
471 Length = Table->Length;
472 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
474 if (Length < (sizeof (ACPI_TABLE_HEADER) + TableEntrySize))
476 ACPI_BIOS_ERROR ((AE_INFO,
477 "Invalid table length 0x%X in RSDT/XSDT", Length));
478 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
481 Table = AcpiOsMapMemory (Address, Length);
484 return_ACPI_STATUS (AE_NO_MEMORY);
487 /* Validate the root table checksum */
489 Status = AcpiTbVerifyChecksum (Table, Length);
490 if (ACPI_FAILURE (Status))
492 AcpiOsUnmapMemory (Table, Length);
493 return_ACPI_STATUS (Status);
496 /* Get the number of entries and pointer to first entry */
498 TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) /
500 TableEntry = ACPI_ADD_PTR (UINT8, Table, sizeof (ACPI_TABLE_HEADER));
503 * First two entries in the table array are reserved for the DSDT
504 * and FACS, which are not actually present in the RSDT/XSDT - they
507 AcpiGbl_RootTableList.CurrentTableCount = 2;
509 /* Initialize the root table array from the RSDT/XSDT */
511 for (i = 0; i < TableCount; i++)
513 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
515 Status = AcpiTbInstallStandardTable (
516 AcpiTbGetRootTableEntry (TableEntry, TableEntrySize),
517 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, FALSE, TRUE, &TableIndex);
519 if (ACPI_SUCCESS (Status) &&
520 ACPI_COMPARE_NAME (&AcpiGbl_RootTableList.Tables[TableIndex].Signature,
523 AcpiTbParseFadt (TableIndex);
526 TableEntry += TableEntrySize;
530 * It is not possible to map more than one entry in some environments,
531 * so unmap the root table here before mapping other tables
533 AcpiOsUnmapMemory (Table, Length);
535 return_ACPI_STATUS (AE_OK);