432 lines
13 KiB
C
432 lines
13 KiB
C
/******************************************************************************
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*
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* Module Name: tbutils - ACPI Table utilities
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2014, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include "acpi.h"
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#include "accommon.h"
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#include "actables.h"
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#define _COMPONENT ACPI_TABLES
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ACPI_MODULE_NAME ("tbutils")
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/* Local prototypes */
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static ACPI_PHYSICAL_ADDRESS
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AcpiTbGetRootTableEntry (
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UINT8 *TableEntry,
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UINT32 TableEntrySize);
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#if (!ACPI_REDUCED_HARDWARE)
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbInitializeFacs
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
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* for accessing the Global Lock and Firmware Waking Vector
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiTbInitializeFacs (
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void)
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{
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ACPI_STATUS Status;
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/* If Hardware Reduced flag is set, there is no FACS */
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if (AcpiGbl_ReducedHardware)
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{
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AcpiGbl_FACS = NULL;
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return (AE_OK);
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}
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Status = AcpiGetTableByIndex (ACPI_TABLE_INDEX_FACS,
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ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &AcpiGbl_FACS));
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return (Status);
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}
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#endif /* !ACPI_REDUCED_HARDWARE */
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbTablesLoaded
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*
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* PARAMETERS: None
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*
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* RETURN: TRUE if required ACPI tables are loaded
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*
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* DESCRIPTION: Determine if the minimum required ACPI tables are present
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* (FADT, FACS, DSDT)
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*
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******************************************************************************/
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BOOLEAN
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AcpiTbTablesLoaded (
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void)
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{
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if (AcpiGbl_RootTableList.CurrentTableCount >= 3)
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{
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return (TRUE);
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}
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return (FALSE);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbCheckDsdtHeader
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*
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* PARAMETERS: None
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*
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* RETURN: None
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*
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* DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
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* if the DSDT has been replaced from outside the OS and/or if
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* the DSDT header has been corrupted.
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*
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******************************************************************************/
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void
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AcpiTbCheckDsdtHeader (
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void)
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{
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/* Compare original length and checksum to current values */
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if (AcpiGbl_OriginalDsdtHeader.Length != AcpiGbl_DSDT->Length ||
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AcpiGbl_OriginalDsdtHeader.Checksum != AcpiGbl_DSDT->Checksum)
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{
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ACPI_BIOS_ERROR ((AE_INFO,
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"The DSDT has been corrupted or replaced - "
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"old, new headers below"));
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AcpiTbPrintTableHeader (0, &AcpiGbl_OriginalDsdtHeader);
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AcpiTbPrintTableHeader (0, AcpiGbl_DSDT);
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/* Disable further error messages */
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AcpiGbl_OriginalDsdtHeader.Length = AcpiGbl_DSDT->Length;
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AcpiGbl_OriginalDsdtHeader.Checksum = AcpiGbl_DSDT->Checksum;
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbCopyDsdt
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*
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* PARAMETERS: TableDesc - Installed table to copy
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*
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* RETURN: None
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*
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* DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
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* Some very bad BIOSs are known to either corrupt the DSDT or
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* install a new, bad DSDT. This copy works around the problem.
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*
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******************************************************************************/
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ACPI_TABLE_HEADER *
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AcpiTbCopyDsdt (
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UINT32 TableIndex)
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{
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ACPI_TABLE_HEADER *NewTable;
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ACPI_TABLE_DESC *TableDesc;
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TableDesc = &AcpiGbl_RootTableList.Tables[TableIndex];
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NewTable = ACPI_ALLOCATE (TableDesc->Length);
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if (!NewTable)
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{
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ACPI_ERROR ((AE_INFO, "Could not copy DSDT of length 0x%X",
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TableDesc->Length));
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return (NULL);
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}
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ACPI_MEMCPY (NewTable, TableDesc->Pointer, TableDesc->Length);
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AcpiTbUninstallTable (TableDesc);
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AcpiTbInitTableDescriptor (
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&AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT],
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ACPI_PTR_TO_PHYSADDR (NewTable), ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
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NewTable);
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ACPI_INFO ((AE_INFO,
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"Forced DSDT copy: length 0x%05X copied locally, original unmapped",
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NewTable->Length));
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return (NewTable);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbGetRootTableEntry
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*
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* PARAMETERS: TableEntry - Pointer to the RSDT/XSDT table entry
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* TableEntrySize - sizeof 32 or 64 (RSDT or XSDT)
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*
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* RETURN: Physical address extracted from the root table
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*
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* DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
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* both 32-bit and 64-bit platforms
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*
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* NOTE: ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on
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* 64-bit platforms.
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*
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******************************************************************************/
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static ACPI_PHYSICAL_ADDRESS
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AcpiTbGetRootTableEntry (
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UINT8 *TableEntry,
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UINT32 TableEntrySize)
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{
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UINT64 Address64;
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/*
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* Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
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* Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
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*/
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if (TableEntrySize == ACPI_RSDT_ENTRY_SIZE)
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{
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/*
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* 32-bit platform, RSDT: Return 32-bit table entry
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* 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
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*/
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return ((ACPI_PHYSICAL_ADDRESS) (*ACPI_CAST_PTR (UINT32, TableEntry)));
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}
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else
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{
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/*
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* 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
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* 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
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* return 64-bit
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*/
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ACPI_MOVE_64_TO_64 (&Address64, TableEntry);
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#if ACPI_MACHINE_WIDTH == 32
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if (Address64 > ACPI_UINT32_MAX)
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{
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/* Will truncate 64-bit address to 32 bits, issue warning */
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ACPI_BIOS_WARNING ((AE_INFO,
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"64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
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" truncating",
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ACPI_FORMAT_UINT64 (Address64)));
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}
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#endif
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return ((ACPI_PHYSICAL_ADDRESS) (Address64));
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbParseRootTable
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*
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* PARAMETERS: Rsdp - Pointer to the RSDP
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*
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* RETURN: Status
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*
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* DESCRIPTION: This function is called to parse the Root System Description
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* Table (RSDT or XSDT)
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*
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* NOTE: Tables are mapped (not copied) for efficiency. The FACS must
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* be mapped and cannot be copied because it contains the actual
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* memory location of the ACPI Global Lock.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiTbParseRootTable (
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ACPI_PHYSICAL_ADDRESS RsdpAddress)
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{
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ACPI_TABLE_RSDP *Rsdp;
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UINT32 TableEntrySize;
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UINT32 i;
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UINT32 TableCount;
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ACPI_TABLE_HEADER *Table;
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ACPI_PHYSICAL_ADDRESS Address;
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UINT32 Length;
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UINT8 *TableEntry;
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ACPI_STATUS Status;
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UINT32 TableIndex;
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ACPI_FUNCTION_TRACE (TbParseRootTable);
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/* Map the entire RSDP and extract the address of the RSDT or XSDT */
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Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP));
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if (!Rsdp)
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{
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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AcpiTbPrintTableHeader (RsdpAddress,
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ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp));
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/* Use XSDT if present and not overridden. Otherwise, use RSDT */
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if ((Rsdp->Revision > 1) &&
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Rsdp->XsdtPhysicalAddress &&
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!AcpiGbl_DoNotUseXsdt)
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{
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/*
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* RSDP contains an XSDT (64-bit physical addresses). We must use
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* the XSDT if the revision is > 1 and the XSDT pointer is present,
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* as per the ACPI specification.
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*/
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Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress;
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TableEntrySize = ACPI_XSDT_ENTRY_SIZE;
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}
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else
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{
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/* Root table is an RSDT (32-bit physical addresses) */
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Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress;
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TableEntrySize = ACPI_RSDT_ENTRY_SIZE;
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}
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/*
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* It is not possible to map more than one entry in some environments,
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* so unmap the RSDP here before mapping other tables
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*/
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AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP));
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/* Map the RSDT/XSDT table header to get the full table length */
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Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));
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if (!Table)
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{
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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AcpiTbPrintTableHeader (Address, Table);
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/*
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* Validate length of the table, and map entire table.
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* Minimum length table must contain at least one entry.
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*/
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Length = Table->Length;
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AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
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if (Length < (sizeof (ACPI_TABLE_HEADER) + TableEntrySize))
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{
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ACPI_BIOS_ERROR ((AE_INFO,
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"Invalid table length 0x%X in RSDT/XSDT", Length));
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return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
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}
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Table = AcpiOsMapMemory (Address, Length);
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if (!Table)
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{
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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/* Validate the root table checksum */
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Status = AcpiTbVerifyChecksum (Table, Length);
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if (ACPI_FAILURE (Status))
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{
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AcpiOsUnmapMemory (Table, Length);
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return_ACPI_STATUS (Status);
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}
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/* Get the number of entries and pointer to first entry */
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TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) /
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TableEntrySize);
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TableEntry = ACPI_ADD_PTR (UINT8, Table, sizeof (ACPI_TABLE_HEADER));
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/*
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* First two entries in the table array are reserved for the DSDT
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* and FACS, which are not actually present in the RSDT/XSDT - they
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* come from the FADT
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*/
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AcpiGbl_RootTableList.CurrentTableCount = 2;
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/* Initialize the root table array from the RSDT/XSDT */
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for (i = 0; i < TableCount; i++)
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{
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/* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
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Address = AcpiTbGetRootTableEntry (TableEntry, TableEntrySize);
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/* Skip NULL entries in RSDT/XSDT */
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if (!Address)
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{
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goto NextTable;
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}
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Status = AcpiTbInstallStandardTable (Address,
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ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, FALSE, TRUE, &TableIndex);
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if (ACPI_SUCCESS (Status) &&
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ACPI_COMPARE_NAME (&AcpiGbl_RootTableList.Tables[TableIndex].Signature,
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ACPI_SIG_FADT))
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{
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AcpiTbParseFadt (TableIndex);
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}
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NextTable:
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TableEntry += TableEntrySize;
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}
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AcpiOsUnmapMemory (Table, Length);
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return_ACPI_STATUS (AE_OK);
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}
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