exconvrt.c

acpi tools for linux include acpiexec and acpixtract

/******************************************************************************
 *
 * Module Name: exconvrt - Object conversion routines
 *              $Revision: 1.75 $
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2008, 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 __EXCONVRT_C__

#include "acpi.h"
#include "acinterp.h"
#include "amlcode.h"


#define _COMPONENT          ACPI_EXECUTER
        ACPI_MODULE_NAME    ("exconvrt")

/* Local prototypes */

static UINT32
AcpiExConvertToAscii (
    ACPI_INTEGER            Integer,
    UINT16                  Base,
    UINT8                   *String,
    UINT8                   MaxLength);


/*******************************************************************************
 *
 * FUNCTION:    AcpiExConvertToInteger
 *
 * PARAMETERS:  ObjDesc         - Object to be converted.  Must be an
 *                                Integer, Buffer, or String
 *              ResultDesc      - Where the new Integer object is returned
 *              Flags           - Used for string conversion
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert an ACPI Object to an integer.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExConvertToInteger (
    ACPI_OPERAND_OBJECT     *ObjDesc,
    ACPI_OPERAND_OBJECT     **ResultDesc,
    UINT32                  Flags)
{
    ACPI_OPERAND_OBJECT     *ReturnDesc;
    UINT8                   *Pointer;
    ACPI_INTEGER            Result;
    UINT32                  i;
    UINT32                  Count;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE_PTR (ExConvertToInteger, ObjDesc);


    switch (ACPI_GET_OBJECT_TYPE (ObjDesc))
    {
    case ACPI_TYPE_INTEGER:

        /* No conversion necessary */

        *ResultDesc = ObjDesc;
        return_ACPI_STATUS (AE_OK);

    case ACPI_TYPE_BUFFER:
    case ACPI_TYPE_STRING:

        /* Note: Takes advantage of common buffer/string fields */

        Pointer = ObjDesc->Buffer.Pointer;
        Count   = ObjDesc->Buffer.Length;
        break;

    default:
        return_ACPI_STATUS (AE_TYPE);
    }

    /*
     * Convert the buffer/string to an integer.  Note that both buffers and
     * strings are treated as raw data - we don't convert ascii to hex for
     * strings.
     *
     * There are two terminating conditions for the loop:
     * 1) The size of an integer has been reached, or
     * 2) The end of the buffer or string has been reached
     */
    Result = 0;

    /* String conversion is different than Buffer conversion */

    switch (ACPI_GET_OBJECT_TYPE (ObjDesc))
    {
    case ACPI_TYPE_STRING:

        /*
         * Convert string to an integer - for most cases, the string must be
         * hexadecimal as per the ACPI specification.  The only exception (as
         * of ACPI 3.0) is that the ToInteger() operator allows both decimal
         * and hexadecimal strings (hex prefixed with "0x").
         */
        Status = AcpiUtStrtoul64 ((char *) Pointer, Flags, &Result);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
        break;


    case ACPI_TYPE_BUFFER:

        /* Check for zero-length buffer */

        if (!Count)
        {
            return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
        }

        /* Transfer no more than an integer's worth of data */

        if (Count > AcpiGbl_IntegerByteWidth)
        {
            Count = AcpiGbl_IntegerByteWidth;
        }

        /*
         * Convert buffer to an integer - we simply grab enough raw data
         * from the buffer to fill an integer
         */
        for (i = 0; i < Count; i++)
        {
            /*
             * Get next byte and shift it into the Result.
             * Little endian is used, meaning that the first byte of the buffer
             * is the LSB of the integer
             */
            Result |= (((ACPI_INTEGER) Pointer[i]) << (i * 8));
        }
        break;


    default:
        /* No other types can get here */
        break;
    }

    /* Create a new integer */

    ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
    if (!ReturnDesc)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n",
        ACPI_FORMAT_UINT64 (Result)));

    /* Save the Result */

    ReturnDesc->Integer.Value = Result;
    AcpiExTruncateFor32bitTable (ReturnDesc);
    *ResultDesc = ReturnDesc;
    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExConvertToBuffer
 *
 * PARAMETERS:  ObjDesc         - Object to be converted.  Must be an
 *                                Integer, Buffer, or String
 *              ResultDesc      - Where the new buffer object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert an ACPI Object to a Buffer
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExConvertToBuffer (
    ACPI_OPERAND_OBJECT     *ObjDesc,
    ACPI_OPERAND_OBJECT     **ResultDesc)
{
    ACPI_OPERAND_OBJECT     *ReturnDesc;
    UINT8                   *NewBuf;


    ACPI_FUNCTION_TRACE_PTR (ExConvertToBuffer, ObjDesc);


    switch (ACPI_GET_OBJECT_TYPE (ObjDesc))
    {
    case ACPI_TYPE_BUFFER:

        /* No conversion necessary */

        *ResultDesc = ObjDesc;
        return_ACPI_STATUS (AE_OK);


    case ACPI_TYPE_INTEGER:

        /*
         * Create a new Buffer object.
         * Need enough space for one integer
         */
        ReturnDesc = AcpiUtCreateBufferObject (AcpiGbl_IntegerByteWidth);
        if (!ReturnDesc)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        /* Copy the integer to the buffer, LSB first */

        NewBuf = ReturnDesc->Buffer.Pointer;
        ACPI_MEMCPY (NewBuf,
                        &ObjDesc->Integer.Value,
                        AcpiGbl_IntegerByteWidth);
        break;


    case ACPI_TYPE_STRING:

        /*
         * Create a new Buffer object
         * Size will be the string length
         *
         * NOTE: Add one to the string length to include the null terminator.
         * The ACPI spec is unclear on this subject, but there is existing
         * ASL/AML code that depends on the null being transferred to the new
         * buffer.
         */
        ReturnDesc = AcpiUtCreateBufferObject (
                        (ACPI_SIZE) ObjDesc->String.Length + 1);
        if (!ReturnDesc)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        /* Copy the string to the buffer */

        NewBuf = ReturnDesc->Buffer.Pointer;
        ACPI_STRNCPY ((char *) NewBuf, (char *) ObjDesc->String.Pointer,
            ObjDesc->String.Length);
        break;


    default:
        return_ACPI_STATUS (AE_TYPE);
    }

    /* Mark buffer initialized */

    ReturnDesc->Common.Flags |= AOPOBJ_DATA_VALID;
    *ResultDesc = ReturnDesc;
    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExConvertToAscii
 *
 * PARAMETERS:  Integer         - Value to be converted
 *              Base            - ACPI_STRING_DECIMAL or ACPI_STRING_HEX
 *              String          - Where the string is returned
 *              DataWidth       - Size of data item to be converted, in bytes
 *
 * RETURN:      Actual string length
 *
 * DESCRIPTION: Convert an ACPI Integer to a hex or decimal string
 *
 ******************************************************************************/

static UINT32
AcpiExConvertToAscii (
    ACPI_INTEGER            Integer,
    UINT16                  Base,
    UINT8                   *String,
    UINT8                   DataWidth)
{
    ACPI_INTEGER            Digit;
    ACPI_NATIVE_UINT        i;
    ACPI_NATIVE_UINT        j;
    ACPI_NATIVE_UINT        k = 0;
    ACPI_NATIVE_UINT        HexLength;
    ACPI_NATIVE_UINT        DecimalLength;
    UINT32                  Remainder;
    BOOLEAN                 SupressZeros;


    ACPI_FUNCTION_ENTRY ();