/******************************************************************************
*
* Module Name: tbutils - Table manipulation utilities
* $Revision: 60 $
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2003, Intel Corp.
* All rights reserved.
*
* 2. License
*
* 2.1. This is your license from Intel Corp. under its intellectual property
* rights. You may have additional license terms from the party that provided
* you this software, covering your right to use that party's intellectual
* property rights.
*
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
* copy of the source code appearing in this file ("Covered Code") an
* irrevocable, perpetual, worldwide license under Intel's copyrights in the
* base code distributed originally by Intel ("Original Intel Code") to copy,
* make derivatives, distribute, use and display any portion of the Covered
* Code in any form, with the right to sublicense such rights; and
*
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
* license (with the right to sublicense), under only those claims of Intel
* patents that are infringed by the Original Intel Code, to make, use, sell,
* offer to sell, and import the Covered Code and derivative works thereof
* solely to the minimum extent necessary to exercise the above copyright
* license, and in no event shall the patent license extend to any additions
* to or modifications of the Original Intel Code. No other license or right
* is granted directly or by implication, estoppel or otherwise;
*
* The above copyright and patent license is granted only if the following
* conditions are met:
*
* 3. Conditions
*
* 3.1. Redistribution of Source with Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification with rights to further distribute source must include
* the above Copyright Notice, the above License, this list of Conditions,
* and the following Disclaimer and Export Compliance provision. In addition,
* Licensee must cause all Covered Code to which Licensee contributes to
* contain a file documenting the changes Licensee made to create that Covered
* Code and the date of any change. Licensee must include in that file the
* documentation of any changes made by any predecessor Licensee. Licensee
* must include a prominent statement that the modification is derived,
* directly or indirectly, from Original Intel Code.
*
* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification without rights to further distribute source must
* include the following Disclaimer and Export Compliance provision in the
* documentation and/or other materials provided with distribution. In
* addition, Licensee may not authorize further sublicense of source of any
* portion of the Covered Code, and must include terms to the effect that the
* license from Licensee to its licensee is limited to the intellectual
* property embodied in the software Licensee provides to its licensee, and
* not to intellectual property embodied in modifications its licensee may
* make.
*
* 3.3. Redistribution of Executable. Redistribution in executable form of any
* substantial portion of the Covered Code or modification must reproduce the
* above Copyright Notice, and the following Disclaimer and Export Compliance
* provision in the documentation and/or other materials provided with the
* distribution.
*
* 3.4. Intel retains all right, title, and interest in and to the Original
* Intel Code.
*
* 3.5. Neither the name Intel nor any other trademark owned or controlled by
* Intel shall be used in advertising or otherwise to promote the sale, use or
* other dealings in products derived from or relating to the Covered Code
* without prior written authorization from Intel.
*
* 4. Disclaimer and Export Compliance
*
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
* LIMITED REMEDY.
*
* 4.3. Licensee shall not export, either directly or indirectly, any of this
* software or system incorporating such software without first obtaining any
* required license or other approval from the U. S. Department of Commerce or
* any other agency or department of the United States Government. In the
* event Licensee exports any such software from the United States or
* re-exports any such software from a foreign destination, Licensee shall
* ensure that the distribution and export/re-export of the software is in
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* any of its subsidiaries will export/re-export any technical data, process,
* software, or service, directly or indirectly, to any country for which the
* United States government or any agency thereof requires an export license,
* other governmental approval, or letter of assurance, without first obtaining
* such license, approval or letter.
*
*****************************************************************************/
#define __TBUTILS_C__
#include "acpi.h"
#include "actables.h"
#define _COMPONENT ACPI_TABLES
ACPI_MODULE_NAME ("tbutils")
/*******************************************************************************
*
* FUNCTION: AcpiTbHandleToObject
*
* PARAMETERS: TableId - Id for which the function is searching
* TableDesc - Pointer to return the matching table
* descriptor.
*
* RETURN: Search the tables to find one with a matching TableId and
* return a pointer to that table descriptor.
*
******************************************************************************/
ACPI_STATUS
AcpiTbHandleToObject (
UINT16 TableId,
ACPI_TABLE_DESC **ReturnTableDesc)
{
UINT32 i;
ACPI_TABLE_DESC *TableDesc;
ACPI_FUNCTION_NAME ("TbHandleToObject");
for (i = 0; i < ACPI_TABLE_MAX; i++)
{
TableDesc = AcpiGbl_TableLists[i].Next;
while (TableDesc)
{
if (TableDesc->TableId == TableId)
{
*ReturnTableDesc = TableDesc;
return (AE_OK);
}
TableDesc = TableDesc->Next;
}
}
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "TableId=%X does not exist\n", TableId));
return (AE_BAD_PARAMETER);
}
/*******************************************************************************
*
* FUNCTION: AcpiTbValidateTableHeader
*
* PARAMETERS: TableHeader - Logical pointer to the table
*
* RETURN: Status
*
* DESCRIPTION: Check an ACPI table header for validity
*
* NOTE: Table pointers are validated as follows:
* 1) Table pointer must point to valid physical memory
* 2) Signature must be 4 ASCII chars, even if we don't recognize the
* name
* 3) Table must be readable for length specified in the header
* 4) Table checksum must be valid (with the exception of the FACS
* which has no checksum because it contains variable fields)
*
******************************************************************************/
ACPI_STATUS
AcpiTbValidateTableHeader (
ACPI_TABLE_HEADER *TableHeader)
{
ACPI_NAME Signature;
ACPI_FUNCTION_NAME ("TbValidateTableHeader");
/* Verify that this is a valid address */
if (!AcpiOsReadable (TableHeader, sizeof (ACPI_TABLE_HEADER)))
{
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Cannot read table header at %p\n", TableHeader));
return (AE_BAD_ADDRESS);
}
/* Ensure that the signature is 4 ASCII characters */
ACPI_MOVE_32_TO_32 (&Signature, TableHeader->Signature);
if (!AcpiUtValidAcpiName (Signature))
{
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Table signature at %p [%p] has invalid characters\n",
TableHeader, &Signature));
ACPI_REPORT_WARNING (("Invalid table signature found: [%4.4s]\n",
(char *) &Signature));
ACPI_DUMP_BUFFER (TableHeader, sizeof (ACPI_TABLE_HEADER));
return (AE_BAD_SIGNATURE);
}
/* Validate the table length */
if (TableHeader->Length < sizeof (ACPI_TABLE_HEADER))
{
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Invalid length in table header %p name %4.4s\n",
TableHeader, (char *) &Signature));
ACPI_REPORT_WARNING (("Invalid table header length (0x%X) found\n",
(UINT32) TableHeader->Length));
ACPI_DUMP_BUFFER (TableHeader, sizeof (ACPI_TABLE_HEADER));
return (AE_BAD_HEADER);
}
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiTbVerifyTableChecksum
*
* PARAMETERS: *TableHeader - ACPI table to verify
*
* RETURN: 8 bit checksum of table
*
* DESCRIPTION: Does an 8 bit checksum of table and returns status. A correct
* table should have a checksum of 0.
*
******************************************************************************/
ACPI_STATUS
AcpiTbVerifyTableChecksum (
ACPI_TABLE_HEADER *TableHeader)
{
UINT8 Checksum;
ACPI_STATUS Status = AE_OK;
ACPI_FUNCTION_TRACE ("TbVerifyTableChecksum");
/* Compute the checksum on the table */
Checksum = AcpiTbChecksum (TableHeader, TableHeader->Length);
/* Return the appropriate exception */
if (Checksum)
{
ACPI_REPORT_WARNING (("Invalid checksum in table [%4.4s] (%02X, sum %02X is not zero)\n",
TableHeader->Signature, (UINT32) TableHeader->Checksum, (UINT32) Checksum));
Status = AE_BAD_CHECKSUM;
}
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiTbChecksum
*
* PARAMETERS: Buffer - Buffer to checksum
* Length - Size of the buffer
*
* RETURNS 8 bit checksum of buffer
*
* DESCRIPTION: Computes an 8 bit checksum of the buffer(length) and returns it.
*
******************************************************************************/
UINT8
AcpiTbChecksum (
void *Buffer,
UINT32 Length)
{
const UINT8 *limit;
const UINT8 *rover;
UINT8 sum = 0;
if (Buffer && Length)
{
/* Buffer and Length are valid */
limit = (UINT8 *) Buffer + Length;
for (rover = Buffer; rover < limit; rover++)
{
sum = (UINT8) (sum + *rover);
}
}
return (sum);
}
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