1 /******************************************************************************
3 * Module Name: tbutils - ACPI Table utilities
5 *****************************************************************************/
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48 #define _COMPONENT ACPI_TABLES
49 ACPI_MODULE_NAME ("tbutils")
52 /* Local prototypes */
54 static ACPI_PHYSICAL_ADDRESS
55 AcpiTbGetRootTableEntry (
57 UINT32 TableEntrySize);
60 #if (!ACPI_REDUCED_HARDWARE)
61 /*******************************************************************************
63 * FUNCTION: AcpiTbInitializeFacs
69 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
70 * for accessing the Global Lock and Firmware Waking Vector
72 ******************************************************************************/
75 AcpiTbInitializeFacs (
81 /* If Hardware Reduced flag is set, there is no FACS */
83 if (AcpiGbl_ReducedHardware)
89 Status = AcpiGetTableByIndex (ACPI_TABLE_INDEX_FACS,
90 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &AcpiGbl_FACS));
93 #endif /* !ACPI_REDUCED_HARDWARE */
96 /*******************************************************************************
98 * FUNCTION: AcpiTbTablesLoaded
102 * RETURN: TRUE if required ACPI tables are loaded
104 * DESCRIPTION: Determine if the minimum required ACPI tables are present
107 ******************************************************************************/
114 if (AcpiGbl_RootTableList.CurrentTableCount >= 3)
123 /*******************************************************************************
125 * FUNCTION: AcpiTbCheckDsdtHeader
131 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
132 * if the DSDT has been replaced from outside the OS and/or if
133 * the DSDT header has been corrupted.
135 ******************************************************************************/
138 AcpiTbCheckDsdtHeader (
142 /* Compare original length and checksum to current values */
144 if (AcpiGbl_OriginalDsdtHeader.Length != AcpiGbl_DSDT->Length ||
145 AcpiGbl_OriginalDsdtHeader.Checksum != AcpiGbl_DSDT->Checksum)
147 ACPI_BIOS_ERROR ((AE_INFO,
148 "The DSDT has been corrupted or replaced - "
149 "old, new headers below"));
150 AcpiTbPrintTableHeader (0, &AcpiGbl_OriginalDsdtHeader);
151 AcpiTbPrintTableHeader (0, AcpiGbl_DSDT);
153 /* Disable further error messages */
155 AcpiGbl_OriginalDsdtHeader.Length = AcpiGbl_DSDT->Length;
156 AcpiGbl_OriginalDsdtHeader.Checksum = AcpiGbl_DSDT->Checksum;
161 /*******************************************************************************
163 * FUNCTION: AcpiTbCopyDsdt
165 * PARAMETERS: TableDesc - Installed table to copy
169 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
170 * Some very bad BIOSs are known to either corrupt the DSDT or
171 * install a new, bad DSDT. This copy works around the problem.
173 ******************************************************************************/
179 ACPI_TABLE_HEADER *NewTable;
180 ACPI_TABLE_DESC *TableDesc;
183 TableDesc = &AcpiGbl_RootTableList.Tables[TableIndex];
185 NewTable = ACPI_ALLOCATE (TableDesc->Length);
188 ACPI_ERROR ((AE_INFO, "Could not copy DSDT of length 0x%X",
193 ACPI_MEMCPY (NewTable, TableDesc->Pointer, TableDesc->Length);
194 AcpiTbUninstallTable (TableDesc);
196 AcpiTbInitTableDescriptor (
197 &AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT],
198 ACPI_PTR_TO_PHYSADDR (NewTable), ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
202 "Forced DSDT copy: length 0x%05X copied locally, original unmapped",
209 /*******************************************************************************
211 * FUNCTION: AcpiTbGetRootTableEntry
213 * PARAMETERS: TableEntry - Pointer to the RSDT/XSDT table entry
214 * TableEntrySize - sizeof 32 or 64 (RSDT or XSDT)
216 * RETURN: Physical address extracted from the root table
218 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
219 * both 32-bit and 64-bit platforms
221 * NOTE: ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on
224 ******************************************************************************/
226 static ACPI_PHYSICAL_ADDRESS
227 AcpiTbGetRootTableEntry (
229 UINT32 TableEntrySize)
235 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
236 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
238 if (TableEntrySize == ACPI_RSDT_ENTRY_SIZE)
241 * 32-bit platform, RSDT: Return 32-bit table entry
242 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
244 return ((ACPI_PHYSICAL_ADDRESS) (*ACPI_CAST_PTR (UINT32, TableEntry)));
249 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
250 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
253 ACPI_MOVE_64_TO_64 (&Address64, TableEntry);
255 #if ACPI_MACHINE_WIDTH == 32
256 if (Address64 > ACPI_UINT32_MAX)
258 /* Will truncate 64-bit address to 32 bits, issue warning */
260 ACPI_BIOS_WARNING ((AE_INFO,
261 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
263 ACPI_FORMAT_UINT64 (Address64)));
266 return ((ACPI_PHYSICAL_ADDRESS) (Address64));
271 /*******************************************************************************
273 * FUNCTION: AcpiTbParseRootTable
275 * PARAMETERS: Rsdp - Pointer to the RSDP
279 * DESCRIPTION: This function is called to parse the Root System Description
280 * Table (RSDT or XSDT)
282 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
283 * be mapped and cannot be copied because it contains the actual
284 * memory location of the ACPI Global Lock.
286 ******************************************************************************/
289 AcpiTbParseRootTable (
290 ACPI_PHYSICAL_ADDRESS RsdpAddress)
292 ACPI_TABLE_RSDP *Rsdp;
293 UINT32 TableEntrySize;
296 ACPI_TABLE_HEADER *Table;
297 ACPI_PHYSICAL_ADDRESS Address;
304 ACPI_FUNCTION_TRACE (TbParseRootTable);
307 /* Map the entire RSDP and extract the address of the RSDT or XSDT */
309 Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP));
312 return_ACPI_STATUS (AE_NO_MEMORY);
315 AcpiTbPrintTableHeader (RsdpAddress,
316 ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp));
318 /* Use XSDT if present and not overridden. Otherwise, use RSDT */
320 if ((Rsdp->Revision > 1) &&
321 Rsdp->XsdtPhysicalAddress &&
322 !AcpiGbl_DoNotUseXsdt)
325 * RSDP contains an XSDT (64-bit physical addresses). We must use
326 * the XSDT if the revision is > 1 and the XSDT pointer is present,
327 * as per the ACPI specification.
329 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress;
330 TableEntrySize = ACPI_XSDT_ENTRY_SIZE;
334 /* Root table is an RSDT (32-bit physical addresses) */
336 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress;
337 TableEntrySize = ACPI_RSDT_ENTRY_SIZE;
341 * It is not possible to map more than one entry in some environments,
342 * so unmap the RSDP here before mapping other tables
344 AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP));
346 /* Map the RSDT/XSDT table header to get the full table length */
348 Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));
351 return_ACPI_STATUS (AE_NO_MEMORY);
354 AcpiTbPrintTableHeader (Address, Table);
357 * Validate length of the table, and map entire table.
358 * Minimum length table must contain at least one entry.
360 Length = Table->Length;
361 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
363 if (Length < (sizeof (ACPI_TABLE_HEADER) + TableEntrySize))
365 ACPI_BIOS_ERROR ((AE_INFO,
366 "Invalid table length 0x%X in RSDT/XSDT", Length));
367 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
370 Table = AcpiOsMapMemory (Address, Length);
373 return_ACPI_STATUS (AE_NO_MEMORY);
376 /* Validate the root table checksum */
378 Status = AcpiTbVerifyChecksum (Table, Length);
379 if (ACPI_FAILURE (Status))
381 AcpiOsUnmapMemory (Table, Length);
382 return_ACPI_STATUS (Status);
385 /* Get the number of entries and pointer to first entry */
387 TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) /
389 TableEntry = ACPI_ADD_PTR (UINT8, Table, sizeof (ACPI_TABLE_HEADER));
392 * First two entries in the table array are reserved for the DSDT
393 * and FACS, which are not actually present in the RSDT/XSDT - they
396 AcpiGbl_RootTableList.CurrentTableCount = 2;
398 /* Initialize the root table array from the RSDT/XSDT */
400 for (i = 0; i < TableCount; i++)
402 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
404 Address = AcpiTbGetRootTableEntry (TableEntry, TableEntrySize);
406 /* Skip NULL entries in RSDT/XSDT */
413 Status = AcpiTbInstallStandardTable (Address,
414 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, FALSE, TRUE, &TableIndex);
416 if (ACPI_SUCCESS (Status) &&
417 ACPI_COMPARE_NAME (&AcpiGbl_RootTableList.Tables[TableIndex].Signature,
420 AcpiTbParseFadt (TableIndex);
425 TableEntry += TableEntrySize;
428 AcpiOsUnmapMemory (Table, Length);
430 return_ACPI_STATUS (AE_OK);