/****************************************************************************** * * Module Name: tbutils - table utilities * *****************************************************************************/ /* * Copyright (C) 2000 - 2011, Intel Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ #define __TBUTILS_C__ #include "acpi.h" #include "accommon.h" #include "actables.h" #define _COMPONENT ACPI_TABLES ACPI_MODULE_NAME ("tbutils") /* Local prototypes */ static void AcpiTbFixString ( char *String, ACPI_SIZE Length); static void AcpiTbCleanupTableHeader ( ACPI_TABLE_HEADER *OutHeader, ACPI_TABLE_HEADER *Header); static ACPI_PHYSICAL_ADDRESS AcpiTbGetRootTableEntry ( UINT8 *TableEntry, UINT32 TableEntrySize); /******************************************************************************* * * FUNCTION: AcpiTbInitializeFacs * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global * for accessing the Global Lock and Firmware Waking Vector * ******************************************************************************/ ACPI_STATUS AcpiTbInitializeFacs ( void) { ACPI_STATUS Status; Status = AcpiGetTableByIndex (ACPI_TABLE_INDEX_FACS, ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &AcpiGbl_FACS)); return (Status); } /******************************************************************************* * * FUNCTION: AcpiTbTablesLoaded * * PARAMETERS: None * * RETURN: TRUE if required ACPI tables are loaded * * DESCRIPTION: Determine if the minimum required ACPI tables are present * (FADT, FACS, DSDT) * ******************************************************************************/ BOOLEAN AcpiTbTablesLoaded ( void) { if (AcpiGbl_RootTableList.CurrentTableCount >= 3) { return (TRUE); } return (FALSE); } /******************************************************************************* * * FUNCTION: AcpiTbFixString * * PARAMETERS: String - String to be repaired * Length - Maximum length * * RETURN: None * * DESCRIPTION: Replace every non-printable or non-ascii byte in the string * with a question mark '?'. * ******************************************************************************/ static void AcpiTbFixString ( char *String, ACPI_SIZE Length) { while (Length && *String) { if (!ACPI_IS_PRINT (*String)) { *String = '?'; } String++; Length--; } } /******************************************************************************* * * FUNCTION: AcpiTbCleanupTableHeader * * PARAMETERS: OutHeader - Where the cleaned header is returned * Header - Input ACPI table header * * RETURN: Returns the cleaned header in OutHeader * * DESCRIPTION: Copy the table header and ensure that all "string" fields in * the header consist of printable characters. * ******************************************************************************/ static void AcpiTbCleanupTableHeader ( ACPI_TABLE_HEADER *OutHeader, ACPI_TABLE_HEADER *Header) { ACPI_MEMCPY (OutHeader, Header, sizeof (ACPI_TABLE_HEADER)); AcpiTbFixString (OutHeader->Signature, ACPI_NAME_SIZE); AcpiTbFixString (OutHeader->OemId, ACPI_OEM_ID_SIZE); AcpiTbFixString (OutHeader->OemTableId, ACPI_OEM_TABLE_ID_SIZE); AcpiTbFixString (OutHeader->AslCompilerId, ACPI_NAME_SIZE); } /******************************************************************************* * * FUNCTION: AcpiTbPrintTableHeader * * PARAMETERS: Address - Table physical address * Header - Table header * * RETURN: None * * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP. * ******************************************************************************/ void AcpiTbPrintTableHeader ( ACPI_PHYSICAL_ADDRESS Address, ACPI_TABLE_HEADER *Header) { ACPI_TABLE_HEADER LocalHeader; /* * The reason that the Address is cast to a void pointer is so that we * can use %p which will work properly on both 32-bit and 64-bit hosts. */ if (ACPI_COMPARE_NAME (Header->Signature, ACPI_SIG_FACS)) { /* FACS only has signature and length fields */ ACPI_INFO ((AE_INFO, "%4.4s %p %05X", Header->Signature, ACPI_CAST_PTR (void, Address), Header->Length)); } else if (ACPI_COMPARE_NAME (Header->Signature, ACPI_SIG_RSDP)) { /* RSDP has no common fields */ ACPI_MEMCPY (LocalHeader.OemId, ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->OemId, ACPI_OEM_ID_SIZE); AcpiTbFixString (LocalHeader.OemId, ACPI_OEM_ID_SIZE); ACPI_INFO ((AE_INFO, "RSDP %p %05X (v%.2d %6.6s)", ACPI_CAST_PTR (void, Address), (ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->Revision > 0) ? ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->Length : 20, ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->Revision, LocalHeader.OemId)); } else { /* Standard ACPI table with full common header */ AcpiTbCleanupTableHeader (&LocalHeader, Header); ACPI_INFO ((AE_INFO, "%4.4s %p %05X (v%.2d %6.6s %8.8s %08X %4.4s %08X)", LocalHeader.Signature, ACPI_CAST_PTR (void, Address), LocalHeader.Length, LocalHeader.Revision, LocalHeader.OemId, LocalHeader.OemTableId, LocalHeader.OemRevision, LocalHeader.AslCompilerId, LocalHeader.AslCompilerRevision)); } } /******************************************************************************* * * FUNCTION: AcpiTbValidateChecksum * * PARAMETERS: Table - ACPI table to verify * Length - Length of entire table * * RETURN: Status * * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns * exception on bad checksum. * ******************************************************************************/ ACPI_STATUS AcpiTbVerifyChecksum ( ACPI_TABLE_HEADER *Table, UINT32 Length) { UINT8 Checksum; /* Compute the checksum on the table */ Checksum = AcpiTbChecksum (ACPI_CAST_PTR (UINT8, Table), Length); /* Checksum ok? (should be zero) */ if (Checksum) { ACPI_WARNING ((AE_INFO, "Incorrect checksum in table [%4.4s] - 0x%2.2X, should be 0x%2.2X", Table->Signature, Table->Checksum, (UINT8) (Table->Checksum - Checksum))); #if (ACPI_CHECKSUM_ABORT) return (AE_BAD_CHECKSUM); #endif } return (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiTbChecksum * * PARAMETERS: Buffer - Pointer to memory region to be checked * Length - Length of this memory region * * RETURN: Checksum (UINT8) * * DESCRIPTION: Calculates circular checksum of memory region. * ******************************************************************************/ UINT8 AcpiTbChecksum ( UINT8 *Buffer, UINT32 Length) { UINT8 Sum = 0; UINT8 *End = Buffer + Length; while (Buffer < End) { Sum = (UINT8) (Sum + *(Buffer++)); } return Sum; } /******************************************************************************* * * FUNCTION: AcpiTbCheckDsdtHeader * * PARAMETERS: None * * RETURN: None * * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect * if the DSDT has been replaced from outside the OS and/or if * the DSDT header has been corrupted. * ******************************************************************************/ void AcpiTbCheckDsdtHeader ( void) { /* Compare original length and checksum to current values */ if (AcpiGbl_OriginalDsdtHeader.Length != AcpiGbl_DSDT->Length || AcpiGbl_OriginalDsdtHeader.Checksum != AcpiGbl_DSDT->Checksum) { ACPI_ERROR ((AE_INFO, "The DSDT has been corrupted or replaced - old, new headers below")); AcpiTbPrintTableHeader (0, &AcpiGbl_OriginalDsdtHeader); AcpiTbPrintTableHeader (0, AcpiGbl_DSDT); /* Disable further error messages */ AcpiGbl_OriginalDsdtHeader.Length = AcpiGbl_DSDT->Length; AcpiGbl_OriginalDsdtHeader.Checksum = AcpiGbl_DSDT->Checksum; } } /******************************************************************************* * * FUNCTION: AcpiTbCopyDsdt * * PARAMETERS: TableDesc - Installed table to copy * * RETURN: None * * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory. * Some very bad BIOSs are known to either corrupt the DSDT or * install a new, bad DSDT. This copy works around the problem. * ******************************************************************************/ ACPI_TABLE_HEADER * AcpiTbCopyDsdt ( UINT32 TableIndex) { ACPI_TABLE_HEADER *NewTable; ACPI_TABLE_DESC *TableDesc; TableDesc = &AcpiGbl_RootTableList.Tables[TableIndex]; NewTable = ACPI_ALLOCATE (TableDesc->Length); if (!NewTable) { ACPI_ERROR ((AE_INFO, "Could not copy DSDT of length 0x%X", TableDesc->Length)); return (NULL); } ACPI_MEMCPY (NewTable, TableDesc->Pointer, TableDesc->Length); AcpiTbDeleteTable (TableDesc); TableDesc->Pointer = NewTable; TableDesc->Flags = ACPI_TABLE_ORIGIN_ALLOCATED; ACPI_INFO ((AE_INFO, "Forced DSDT copy: length 0x%05X copied locally, original unmapped", NewTable->Length)); return (NewTable); } /******************************************************************************* * * FUNCTION: AcpiTbInstallTable * * PARAMETERS: Address - Physical address of DSDT or FACS * Signature - Table signature, NULL if no need to * match * TableIndex - Index into root table array * * RETURN: None * * DESCRIPTION: Install an ACPI table into the global data structure. The * table override mechanism is implemented here to allow the host * OS to replace any table before it is installed in the root * table array. * ******************************************************************************/ void AcpiTbInstallTable ( ACPI_PHYSICAL_ADDRESS Address, char *Signature, UINT32 TableIndex) { UINT8 Flags; ACPI_STATUS Status; ACPI_TABLE_HEADER *TableToInstall; ACPI_TABLE_HEADER *MappedTable; ACPI_TABLE_HEADER *OverrideTable = NULL; if (!Address) { ACPI_ERROR ((AE_INFO, "Null physical address for ACPI table [%s]", Signature)); return; } /* Map just the table header */ MappedTable = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER)); if (!MappedTable) { return; } /* If a particular signature is expected (DSDT/FACS), it must match */ if (Signature && !ACPI_COMPARE_NAME (MappedTable->Signature, Signature)) { ACPI_ERROR ((AE_INFO, "Invalid signature 0x%X for ACPI table, expected [%s]", *ACPI_CAST_PTR (UINT32, MappedTable->Signature), Signature)); goto UnmapAndExit; } /* * ACPI Table Override: * * Before we install the table, let the host OS override it with a new * one if desired. Any table within the RSDT/XSDT can be replaced, * including the DSDT which is pointed to by the FADT. */ Status = AcpiOsTableOverride (MappedTable, &OverrideTable); if (ACPI_SUCCESS (Status) && OverrideTable) { ACPI_INFO ((AE_INFO, "%4.4s @ 0x%p Table override, replaced with:", MappedTable->Signature, ACPI_CAST_PTR (void, Address))); AcpiGbl_RootTableList.Tables[TableIndex].Pointer = OverrideTable; Address = ACPI_PTR_TO_PHYSADDR (OverrideTable); TableToInstall = OverrideTable; Flags = ACPI_TABLE_ORIGIN_OVERRIDE; } else { TableToInstall = MappedTable; Flags = ACPI_TABLE_ORIGIN_MAPPED; } /* Initialize the table entry */ AcpiGbl_RootTableList.Tables[TableIndex].Address = Address; AcpiGbl_RootTableList.Tables[TableIndex].Length = TableToInstall->Length; AcpiGbl_RootTableList.Tables[TableIndex].Flags = Flags; ACPI_MOVE_32_TO_32 ( &(AcpiGbl_RootTableList.Tables[TableIndex].Signature), TableToInstall->Signature); AcpiTbPrintTableHeader (Address, TableToInstall); if (TableIndex == ACPI_TABLE_INDEX_DSDT) { /* Global integer width is based upon revision of the DSDT */ AcpiUtSetIntegerWidth (TableToInstall->Revision); } UnmapAndExit: AcpiOsUnmapMemory (MappedTable, sizeof (ACPI_TABLE_HEADER)); } /******************************************************************************* * * FUNCTION: AcpiTbGetRootTableEntry * * PARAMETERS: TableEntry - Pointer to the RSDT/XSDT table entry * TableEntrySize - sizeof 32 or 64 (RSDT or XSDT) * * RETURN: Physical address extracted from the root table * * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on * both 32-bit and 64-bit platforms * * NOTE: ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on * 64-bit platforms. * ******************************************************************************/ static ACPI_PHYSICAL_ADDRESS AcpiTbGetRootTableEntry ( UINT8 *TableEntry, UINT32 TableEntrySize) { UINT64 Address64; /* * Get the table physical address (32-bit for RSDT, 64-bit for XSDT): * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT */ if (TableEntrySize == sizeof (UINT32)) { /* * 32-bit platform, RSDT: Return 32-bit table entry * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return */ return ((ACPI_PHYSICAL_ADDRESS) (*ACPI_CAST_PTR (UINT32, TableEntry))); } else { /* * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, * return 64-bit */ ACPI_MOVE_64_TO_64 (&Address64, TableEntry); #if ACPI_MACHINE_WIDTH == 32 if (Address64 > ACPI_UINT32_MAX) { /* Will truncate 64-bit address to 32 bits, issue warning */ ACPI_WARNING ((AE_INFO, "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X)," " truncating", ACPI_FORMAT_UINT64 (Address64))); } #endif return ((ACPI_PHYSICAL_ADDRESS) (Address64)); } } /******************************************************************************* * * FUNCTION: AcpiTbParseRootTable * * PARAMETERS: Rsdp - Pointer to the RSDP * * RETURN: Status * * DESCRIPTION: This function is called to parse the Root System Description * Table (RSDT or XSDT) * * NOTE: Tables are mapped (not copied) for efficiency. The FACS must * be mapped and cannot be copied because it contains the actual * memory location of the ACPI Global Lock. * ******************************************************************************/ ACPI_STATUS AcpiTbParseRootTable ( ACPI_PHYSICAL_ADDRESS RsdpAddress) { ACPI_TABLE_RSDP *Rsdp; UINT32 TableEntrySize; UINT32 i; UINT32 TableCount; ACPI_TABLE_HEADER *Table; ACPI_PHYSICAL_ADDRESS Address; UINT32 Length; UINT8 *TableEntry; ACPI_STATUS Status; ACPI_FUNCTION_TRACE (TbParseRootTable); /* * Map the entire RSDP and extract the address of the RSDT or XSDT */ Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP)); if (!Rsdp) { return_ACPI_STATUS (AE_NO_MEMORY); } AcpiTbPrintTableHeader (RsdpAddress, ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp)); /* Differentiate between RSDT and XSDT root tables */ if (Rsdp->Revision > 1 && Rsdp->XsdtPhysicalAddress) { /* * Root table is an XSDT (64-bit physical addresses). We must use the * XSDT if the revision is > 1 and the XSDT pointer is present, as per * the ACPI specification. */ Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress; TableEntrySize = sizeof (UINT64); } else { /* Root table is an RSDT (32-bit physical addresses) */ Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress; TableEntrySize = sizeof (UINT32); } /* * It is not possible to map more than one entry in some environments, * so unmap the RSDP here before mapping other tables */ AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP)); /* Map the RSDT/XSDT table header to get the full table length */ Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER)); if (!Table) { return_ACPI_STATUS (AE_NO_MEMORY); } AcpiTbPrintTableHeader (Address, Table); /* Get the length of the full table, verify length and map entire table */ Length = Table->Length; AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER)); if (Length < sizeof (ACPI_TABLE_HEADER)) { ACPI_ERROR ((AE_INFO, "Invalid length 0x%X in RSDT/XSDT", Length)); return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); } Table = AcpiOsMapMemory (Address, Length); if (!Table) { return_ACPI_STATUS (AE_NO_MEMORY); } /* Validate the root table checksum */ Status = AcpiTbVerifyChecksum (Table, Length); if (ACPI_FAILURE (Status)) { AcpiOsUnmapMemory (Table, Length); return_ACPI_STATUS (Status); } /* Calculate the number of tables described in the root table */ TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) / TableEntrySize); /* * First two entries in the table array are reserved for the DSDT * and FACS, which are not actually present in the RSDT/XSDT - they * come from the FADT */ TableEntry = ACPI_CAST_PTR (UINT8, Table) + sizeof (ACPI_TABLE_HEADER); AcpiGbl_RootTableList.CurrentTableCount = 2; /* * Initialize the root table array from the RSDT/XSDT */ for (i = 0; i < TableCount; i++) { if (AcpiGbl_RootTableList.CurrentTableCount >= AcpiGbl_RootTableList.MaxTableCount) { /* There is no more room in the root table array, attempt resize */ Status = AcpiTbResizeRootTableList (); if (ACPI_FAILURE (Status)) { ACPI_WARNING ((AE_INFO, "Truncating %u table entries!", (unsigned) (TableCount - (AcpiGbl_RootTableList.CurrentTableCount - 2)))); break; } } /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */ AcpiGbl_RootTableList.Tables[AcpiGbl_RootTableList.CurrentTableCount].Address = AcpiTbGetRootTableEntry (TableEntry, TableEntrySize); TableEntry += TableEntrySize; AcpiGbl_RootTableList.CurrentTableCount++; } /* * It is not possible to map more than one entry in some environments, * so unmap the root table here before mapping other tables */ AcpiOsUnmapMemory (Table, Length); /* * Complete the initialization of the root table array by examining * the header of each table */ for (i = 2; i < AcpiGbl_RootTableList.CurrentTableCount; i++) { AcpiTbInstallTable (AcpiGbl_RootTableList.Tables[i].Address, NULL, i); /* Special case for FADT - get the DSDT and FACS */ if (ACPI_COMPARE_NAME ( &AcpiGbl_RootTableList.Tables[i].Signature, ACPI_SIG_FADT)) { AcpiTbParseFadt (i); } } return_ACPI_STATUS (AE_OK); }