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 */
56 static ACPI_PHYSICAL_ADDRESS
57 AcpiTbGetRootTableEntry (
59 UINT32 TableEntrySize);
62 #if (!ACPI_REDUCED_HARDWARE)
63 /*******************************************************************************
65 * FUNCTION: AcpiTbInitializeFacs
71 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
72 * for accessing the Global Lock and Firmware Waking Vector
74 ******************************************************************************/
77 AcpiTbInitializeFacs (
83 /* If Hardware Reduced flag is set, there is no FACS */
85 if (AcpiGbl_ReducedHardware)
91 Status = AcpiGetTableByIndex (ACPI_TABLE_INDEX_FACS,
92 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &AcpiGbl_FACS));
95 #endif /* !ACPI_REDUCED_HARDWARE */
98 /*******************************************************************************
100 * FUNCTION: AcpiTbTablesLoaded
104 * RETURN: TRUE if required ACPI tables are loaded
106 * DESCRIPTION: Determine if the minimum required ACPI tables are present
109 ******************************************************************************/
116 if (AcpiGbl_RootTableList.CurrentTableCount >= 3)
125 /*******************************************************************************
127 * FUNCTION: AcpiTbCheckDsdtHeader
133 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
134 * if the DSDT has been replaced from outside the OS and/or if
135 * the DSDT header has been corrupted.
137 ******************************************************************************/
140 AcpiTbCheckDsdtHeader (
144 /* Compare original length and checksum to current values */
146 if (AcpiGbl_OriginalDsdtHeader.Length != AcpiGbl_DSDT->Length ||
147 AcpiGbl_OriginalDsdtHeader.Checksum != AcpiGbl_DSDT->Checksum)
149 ACPI_BIOS_ERROR ((AE_INFO,
150 "The DSDT has been corrupted or replaced - "
151 "old, new headers below"));
152 AcpiTbPrintTableHeader (0, &AcpiGbl_OriginalDsdtHeader);
153 AcpiTbPrintTableHeader (0, AcpiGbl_DSDT);
155 /* Disable further error messages */
157 AcpiGbl_OriginalDsdtHeader.Length = AcpiGbl_DSDT->Length;
158 AcpiGbl_OriginalDsdtHeader.Checksum = AcpiGbl_DSDT->Checksum;
163 /*******************************************************************************
165 * FUNCTION: AcpiTbCopyDsdt
167 * PARAMETERS: TableDesc - Installed table to copy
171 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
172 * Some very bad BIOSs are known to either corrupt the DSDT or
173 * install a new, bad DSDT. This copy works around the problem.
175 ******************************************************************************/
181 ACPI_TABLE_HEADER *NewTable;
182 ACPI_TABLE_DESC *TableDesc;
185 TableDesc = &AcpiGbl_RootTableList.Tables[TableIndex];
187 NewTable = ACPI_ALLOCATE (TableDesc->Length);
190 ACPI_ERROR ((AE_INFO, "Could not copy DSDT of length 0x%X",
195 ACPI_MEMCPY (NewTable, TableDesc->Pointer, TableDesc->Length);
196 AcpiTbUninstallTable (TableDesc);
198 AcpiTbInitTableDescriptor (
199 &AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT],
200 ACPI_PTR_TO_PHYSADDR (NewTable), ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
204 "Forced DSDT copy: length 0x%05X copied locally, original unmapped",
211 /*******************************************************************************
213 * FUNCTION: AcpiTbGetRootTableEntry
215 * PARAMETERS: TableEntry - Pointer to the RSDT/XSDT table entry
216 * TableEntrySize - sizeof 32 or 64 (RSDT or XSDT)
218 * RETURN: Physical address extracted from the root table
220 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
221 * both 32-bit and 64-bit platforms
223 * NOTE: ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on
226 ******************************************************************************/
228 static ACPI_PHYSICAL_ADDRESS
229 AcpiTbGetRootTableEntry (
231 UINT32 TableEntrySize)
237 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
238 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
240 if (TableEntrySize == ACPI_RSDT_ENTRY_SIZE)
243 * 32-bit platform, RSDT: Return 32-bit table entry
244 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
246 return ((ACPI_PHYSICAL_ADDRESS) (*ACPI_CAST_PTR (UINT32, TableEntry)));
251 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
252 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
255 ACPI_MOVE_64_TO_64 (&Address64, TableEntry);
257 #if ACPI_MACHINE_WIDTH == 32
258 if (Address64 > ACPI_UINT32_MAX)
260 /* Will truncate 64-bit address to 32 bits, issue warning */
262 ACPI_BIOS_WARNING ((AE_INFO,
263 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
265 ACPI_FORMAT_UINT64 (Address64)));
268 return ((ACPI_PHYSICAL_ADDRESS) (Address64));
273 /*******************************************************************************
275 * FUNCTION: AcpiTbParseRootTable
277 * PARAMETERS: Rsdp - Pointer to the RSDP
281 * DESCRIPTION: This function is called to parse the Root System Description
282 * Table (RSDT or XSDT)
284 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
285 * be mapped and cannot be copied because it contains the actual
286 * memory location of the ACPI Global Lock.
288 ******************************************************************************/
291 AcpiTbParseRootTable (
292 ACPI_PHYSICAL_ADDRESS RsdpAddress)
294 ACPI_TABLE_RSDP *Rsdp;
295 UINT32 TableEntrySize;
298 ACPI_TABLE_HEADER *Table;
299 ACPI_PHYSICAL_ADDRESS Address;
306 ACPI_FUNCTION_TRACE (TbParseRootTable);
309 /* Map the entire RSDP and extract the address of the RSDT or XSDT */
311 Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP));
314 return_ACPI_STATUS (AE_NO_MEMORY);
317 AcpiTbPrintTableHeader (RsdpAddress,
318 ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp));
320 /* Use XSDT if present and not overridden. Otherwise, use RSDT */
322 if ((Rsdp->Revision > 1) &&
323 Rsdp->XsdtPhysicalAddress &&
324 !AcpiGbl_DoNotUseXsdt)
327 * RSDP contains an XSDT (64-bit physical addresses). We must use
328 * the XSDT if the revision is > 1 and the XSDT pointer is present,
329 * as per the ACPI specification.
331 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress;
332 TableEntrySize = ACPI_XSDT_ENTRY_SIZE;
336 /* Root table is an RSDT (32-bit physical addresses) */
338 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress;
339 TableEntrySize = ACPI_RSDT_ENTRY_SIZE;
343 * It is not possible to map more than one entry in some environments,
344 * so unmap the RSDP here before mapping other tables
346 AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP));
348 /* Map the RSDT/XSDT table header to get the full table length */
350 Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));
353 return_ACPI_STATUS (AE_NO_MEMORY);
356 AcpiTbPrintTableHeader (Address, Table);
359 * Validate length of the table, and map entire table.
360 * Minimum length table must contain at least one entry.
362 Length = Table->Length;
363 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
365 if (Length < (sizeof (ACPI_TABLE_HEADER) + TableEntrySize))
367 ACPI_BIOS_ERROR ((AE_INFO,
368 "Invalid table length 0x%X in RSDT/XSDT", Length));
369 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
372 Table = AcpiOsMapMemory (Address, Length);
375 return_ACPI_STATUS (AE_NO_MEMORY);
378 /* Validate the root table checksum */
380 Status = AcpiTbVerifyChecksum (Table, Length);
381 if (ACPI_FAILURE (Status))
383 AcpiOsUnmapMemory (Table, Length);
384 return_ACPI_STATUS (Status);
387 /* Get the number of entries and pointer to first entry */
389 TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) /
391 TableEntry = ACPI_ADD_PTR (UINT8, Table, sizeof (ACPI_TABLE_HEADER));
394 * First two entries in the table array are reserved for the DSDT
395 * and FACS, which are not actually present in the RSDT/XSDT - they
398 AcpiGbl_RootTableList.CurrentTableCount = 2;
400 /* Initialize the root table array from the RSDT/XSDT */
402 for (i = 0; i < TableCount; i++)
404 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
406 Address = AcpiTbGetRootTableEntry (TableEntry, TableEntrySize);
408 /* Skip NULL entries in RSDT/XSDT */
415 Status = AcpiTbInstallStandardTable (Address,
416 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, FALSE, TRUE, &TableIndex);
418 if (ACPI_SUCCESS (Status) &&
419 ACPI_COMPARE_NAME (&AcpiGbl_RootTableList.Tables[TableIndex].Signature,
422 AcpiTbParseFadt (TableIndex);
427 TableEntry += TableEntrySize;
430 AcpiOsUnmapMemory (Table, Length);
432 return_ACPI_STATUS (AE_OK);