414 lines
14 KiB
C
414 lines
14 KiB
C
/******************************************************************************
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*
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* Module Name: tbutils - Table manipulation utilities
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* $Revision: 43 $
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*
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*****************************************************************************/
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/******************************************************************************
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*
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* 1. Copyright Notice
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*
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* Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp.
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* All rights reserved.
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*
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* 2. License
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*
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* 2.1. This is your license from Intel Corp. under its intellectual property
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* rights. You may have additional license terms from the party that provided
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* you this software, covering your right to use that party's intellectual
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* property rights.
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*
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* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
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* copy of the source code appearing in this file ("Covered Code") an
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* irrevocable, perpetual, worldwide license under Intel's copyrights in the
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* base code distributed originally by Intel ("Original Intel Code") to copy,
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* make derivatives, distribute, use and display any portion of the Covered
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* Code in any form, with the right to sublicense such rights; and
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*
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* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
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* license (with the right to sublicense), under only those claims of Intel
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* patents that are infringed by the Original Intel Code, to make, use, sell,
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* offer to sell, and import the Covered Code and derivative works thereof
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* solely to the minimum extent necessary to exercise the above copyright
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* license, and in no event shall the patent license extend to any additions
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* to or modifications of the Original Intel Code. No other license or right
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* is granted directly or by implication, estoppel or otherwise;
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*
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* The above copyright and patent license is granted only if the following
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* conditions are met:
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*
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* 3. Conditions
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*
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* 3.1. Redistribution of Source with Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification with rights to further distribute source must include
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* the above Copyright Notice, the above License, this list of Conditions,
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* and the following Disclaimer and Export Compliance provision. In addition,
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* Licensee must cause all Covered Code to which Licensee contributes to
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* contain a file documenting the changes Licensee made to create that Covered
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* Code and the date of any change. Licensee must include in that file the
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* documentation of any changes made by any predecessor Licensee. Licensee
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* must include a prominent statement that the modification is derived,
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* directly or indirectly, from Original Intel Code.
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*
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* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification without rights to further distribute source must
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* include the following Disclaimer and Export Compliance provision in the
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* documentation and/or other materials provided with distribution. In
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* addition, Licensee may not authorize further sublicense of source of any
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* portion of the Covered Code, and must include terms to the effect that the
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* license from Licensee to its licensee is limited to the intellectual
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* property embodied in the software Licensee provides to its licensee, and
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* not to intellectual property embodied in modifications its licensee may
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* make.
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*
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* 3.3. Redistribution of Executable. Redistribution in executable form of any
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* substantial portion of the Covered Code or modification must reproduce the
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* above Copyright Notice, and the following Disclaimer and Export Compliance
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* provision in the documentation and/or other materials provided with the
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* distribution.
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*
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* 3.4. Intel retains all right, title, and interest in and to the Original
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* Intel Code.
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*
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* 3.5. Neither the name Intel nor any other trademark owned or controlled by
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* Intel shall be used in advertising or otherwise to promote the sale, use or
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* other dealings in products derived from or relating to the Covered Code
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* without prior written authorization from Intel.
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*
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* 4. Disclaimer and Export Compliance
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*
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* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
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* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
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* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
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* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
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* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
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* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
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* PARTICULAR PURPOSE.
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*
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* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
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* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
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* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
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* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
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* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
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* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
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* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
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* LIMITED REMEDY.
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*
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* 4.3. Licensee shall not export, either directly or indirectly, any of this
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* software or system incorporating such software without first obtaining any
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* required license or other approval from the U. S. Department of Commerce or
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* any other agency or department of the United States Government. In the
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* event Licensee exports any such software from the United States or
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* re-exports any such software from a foreign destination, Licensee shall
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* ensure that the distribution and export/re-export of the software is in
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* compliance with all laws, regulations, orders, or other restrictions of the
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* U.S. Export Administration Regulations. Licensee agrees that neither it nor
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* any of its subsidiaries will export/re-export any technical data, process,
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* software, or service, directly or indirectly, to any country for which the
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* United States government or any agency thereof requires an export license,
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* other governmental approval, or letter of assurance, without first obtaining
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* such license, approval or letter.
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*
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*****************************************************************************/
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#define __TBUTILS_C__
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#include "acpi.h"
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#include "actables.h"
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#include "acinterp.h"
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#define _COMPONENT ACPI_TABLES
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MODULE_NAME ("tbutils")
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbHandleToObject
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*
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* PARAMETERS: TableId - Id for which the function is searching
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* TableDesc - Pointer to return the matching table
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* descriptor.
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*
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* RETURN: Search the tables to find one with a matching TableId and
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* return a pointer to that table descriptor.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiTbHandleToObject (
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UINT16 TableId,
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ACPI_TABLE_DESC **TableDesc)
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{
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UINT32 i;
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ACPI_TABLE_DESC *ListHead;
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PROC_NAME ("TbHandleToObject");
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for (i = 0; i < ACPI_TABLE_MAX; i++)
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{
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ListHead = &AcpiGbl_AcpiTables[i];
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do
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{
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if (ListHead->TableId == TableId)
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{
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*TableDesc = ListHead;
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return (AE_OK);
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}
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ListHead = ListHead->Next;
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} while (ListHead != &AcpiGbl_AcpiTables[i]);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "TableId=%X does not exist\n", TableId));
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return (AE_BAD_PARAMETER);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbValidateTableHeader
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*
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* PARAMETERS: TableHeader - Logical pointer to the table
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*
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* RETURN: Status
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*
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* DESCRIPTION: Check an ACPI table header for validity
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*
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* NOTE: Table pointers are validated as follows:
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* 1) Table pointer must point to valid physical memory
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* 2) Signature must be 4 ASCII chars, even if we don't recognize the
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* name
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* 3) Table must be readable for length specified in the header
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* 4) Table checksum must be valid (with the exception of the FACS
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* which has no checksum for some odd reason)
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiTbValidateTableHeader (
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ACPI_TABLE_HEADER *TableHeader)
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{
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ACPI_NAME Signature;
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PROC_NAME ("TbValidateTableHeader");
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/* Verify that this is a valid address */
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if (!AcpiOsReadable (TableHeader, sizeof (ACPI_TABLE_HEADER)))
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Cannot read table header at %p\n", TableHeader));
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return (AE_BAD_ADDRESS);
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}
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/* Ensure that the signature is 4 ASCII characters */
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MOVE_UNALIGNED32_TO_32 (&Signature, &TableHeader->Signature);
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if (!AcpiUtValidAcpiName (Signature))
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Table signature at %p [%p] has invalid characters\n",
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TableHeader, &Signature));
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REPORT_WARNING (("Invalid table signature %4.4s found\n", (char*)&Signature));
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DUMP_BUFFER (TableHeader, sizeof (ACPI_TABLE_HEADER));
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return (AE_BAD_SIGNATURE);
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}
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/* Validate the table length */
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if (TableHeader->Length < sizeof (ACPI_TABLE_HEADER))
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Invalid length in table header %p name %4.4s\n",
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TableHeader, (char*)&Signature));
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REPORT_WARNING (("Invalid table header length found\n"));
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DUMP_BUFFER (TableHeader, sizeof (ACPI_TABLE_HEADER));
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return (AE_BAD_HEADER);
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbMapAcpiTable
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*
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* PARAMETERS: PhysicalAddress - Physical address of table to map
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* *Size - Size of the table. If zero, the size
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* from the table header is used.
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* Actual size is returned here.
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* **LogicalAddress - Logical address of mapped table
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*
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* RETURN: Logical address of the mapped table.
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*
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* DESCRIPTION: Maps the physical address of table into a logical address
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiTbMapAcpiTable (
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ACPI_PHYSICAL_ADDRESS PhysicalAddress,
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UINT32 *Size,
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ACPI_TABLE_HEADER **LogicalAddress)
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{
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ACPI_TABLE_HEADER *Table;
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UINT32 TableSize = *Size;
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ACPI_STATUS Status = AE_OK;
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PROC_NAME ("TbMapAcpiTable");
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/* If size is zero, look at the table header to get the actual size */
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if ((*Size) == 0)
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{
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/* Get the table header so we can extract the table length */
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Status = AcpiOsMapMemory (PhysicalAddress, sizeof (ACPI_TABLE_HEADER),
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(void **) &Table);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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/* Extract the full table length before we delete the mapping */
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TableSize = Table->Length;
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/*
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* Validate the header and delete the mapping.
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* We will create a mapping for the full table below.
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*/
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Status = AcpiTbValidateTableHeader (Table);
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/* Always unmap the memory for the header */
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AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
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/* Exit if header invalid */
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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}
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/* Map the physical memory for the correct length */
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Status = AcpiOsMapMemory (PhysicalAddress, TableSize, (void **) &Table);
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if (ACPI_FAILURE (Status))
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{
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return (Status);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
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"Mapped memory for ACPI table, length=%d(%X) at %p\n",
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TableSize, TableSize, Table));
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*Size = TableSize;
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*LogicalAddress = Table;
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return (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbVerifyTableChecksum
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*
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* PARAMETERS: *TableHeader - ACPI table to verify
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*
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* RETURN: 8 bit checksum of table
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*
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* DESCRIPTION: Does an 8 bit checksum of table and returns status. A correct
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* table should have a checksum of 0.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiTbVerifyTableChecksum (
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ACPI_TABLE_HEADER *TableHeader)
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{
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UINT8 Checksum;
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ACPI_STATUS Status = AE_OK;
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FUNCTION_TRACE ("TbVerifyTableChecksum");
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/* Compute the checksum on the table */
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Checksum = AcpiTbChecksum (TableHeader, TableHeader->Length);
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/* Return the appropriate exception */
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if (Checksum)
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{
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REPORT_WARNING (("Invalid checksum (%X) in table %4.4s\n",
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Checksum, (char*)&TableHeader->Signature));
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Status = AE_BAD_CHECKSUM;
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}
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return_ACPI_STATUS (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbChecksum
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*
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* PARAMETERS: Buffer - Buffer to checksum
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* Length - Size of the buffer
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*
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* RETURNS 8 bit checksum of buffer
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*
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* DESCRIPTION: Computes an 8 bit checksum of the buffer(length) and returns it.
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*
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******************************************************************************/
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UINT8
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AcpiTbChecksum (
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void *Buffer,
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UINT32 Length)
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{
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UINT8 *limit;
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UINT8 *rover;
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UINT8 sum = 0;
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if (Buffer && Length)
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{
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/* Buffer and Length are valid */
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limit = (UINT8 *) Buffer + Length;
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for (rover = Buffer; rover < limit; rover++)
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{
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sum = (UINT8) (sum + *rover);
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}
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}
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return (sum);
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}
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