dmbuffer.c

acpi tools for linux include acpiexec and acpixtract

{
    UINT8                   *ByteData;
    UINT32                  ByteCount;
    UINT32                  WordCount;
    ACPI_PARSE_OBJECT       *SizeOp;
    ACPI_PARSE_OBJECT       *NextOp;
    ACPI_NATIVE_UINT        i;


    /* Buffer size is the buffer argument */

    SizeOp = Op->Common.Value.Arg;

    /* Next, the initializer byte list to examine */

    NextOp = SizeOp->Common.Next;
    if (!NextOp)
    {
        return (FALSE);
    }

    /* Extract the byte list info */

    ByteData = NextOp->Named.Data;
    ByteCount = (UINT32) NextOp->Common.Value.Integer;
    WordCount = ACPI_DIV_2 (ByteCount);

    /*
     * Unicode string must have an even number of bytes and last
     * word must be zero
     */
    if ((!ByteCount)     ||
         (ByteCount < 4) ||
         (ByteCount & 1) ||
        ((UINT16 *) (void *) ByteData)[WordCount - 1] != 0)
    {
        return (FALSE);
    }

    /* For each word, 1st byte must be ascii, 2nd byte must be zero */

    for (i = 0; i < (ByteCount - 2); i += 2)
    {
        if ((!ACPI_IS_PRINT (ByteData[i])) ||
            (ByteData[i + 1] != 0))
        {
            return (FALSE);
        }
    }

    /* Ignore the Size argument in the disassembly of this buffer op */

    SizeOp->Common.DisasmFlags |= ACPI_PARSEOP_IGNORE;
    return (TRUE);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDmIsStringBuffer
 *
 * PARAMETERS:  Op              - Buffer Object to be examined
 *
 * RETURN:      TRUE if buffer contains a ASCII string, FALSE otherwise
 *
 * DESCRIPTION: Determine if a buffer Op contains a ASCII string
 *
 ******************************************************************************/

BOOLEAN
AcpiDmIsStringBuffer (
    ACPI_PARSE_OBJECT       *Op)
{
    UINT8                   *ByteData;
    UINT32                  ByteCount;
    ACPI_PARSE_OBJECT       *SizeOp;
    ACPI_PARSE_OBJECT       *NextOp;
    UINT32                  i;


    /* Buffer size is the buffer argument */

    SizeOp = Op->Common.Value.Arg;

    /* Next, the initializer byte list to examine */

    NextOp = SizeOp->Common.Next;
    if (!NextOp)
    {
        return (FALSE);
    }

    /* Extract the byte list info */

    ByteData = NextOp->Named.Data;
    ByteCount = (UINT32) NextOp->Common.Value.Integer;

    /* Last byte must be the null terminator */

    if ((!ByteCount)     ||
         (ByteCount < 2) ||
         (ByteData[ByteCount-1] != 0))
    {
        return (FALSE);
    }

    for (i = 0; i < (ByteCount - 1); i++)
    {
        /* TBD: allow some escapes (non-ascii chars).
         * they will be handled in the string output routine
         */

        if (!ACPI_IS_PRINT (ByteData[i]))
        {
            return (FALSE);
        }
    }

    return (TRUE);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDmUnicode
 *
 * PARAMETERS:  Op              - Byte List op containing Unicode string
 *
 * RETURN:      None
 *
 * DESCRIPTION: Dump Unicode string as a standard ASCII string.  (Remove
 *              the extra zero bytes).
 *
 ******************************************************************************/

static void
AcpiDmUnicode (
    ACPI_PARSE_OBJECT       *Op)
{
    UINT16                  *WordData;
    UINT32                  WordCount;
    UINT32                  i;


    /* Extract the buffer info as a WORD buffer */

    WordData = ACPI_CAST_PTR (UINT16, Op->Named.Data);
    WordCount = ACPI_DIV_2 (((UINT32) Op->Common.Value.Integer));


    AcpiOsPrintf ("\"");

    /* Write every other byte as an ASCII character */

    for (i = 0; i < (WordCount - 1); i++)
    {
        AcpiOsPrintf ("%c", (int) WordData[i]);
    }

    AcpiOsPrintf ("\")");
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDmIsEisaId
 *
 * PARAMETERS:  Op              - Op to be examined
 *
 * RETURN:      None
 *
 * DESCRIPTION: Determine if an Op can be converted to an EisaId.
 *
 ******************************************************************************/

void
AcpiDmIsEisaId (
    ACPI_PARSE_OBJECT       *Op)
{
    UINT32                  Name;
    UINT32                  BigEndianId;
    ACPI_PARSE_OBJECT       *NextOp;
    ACPI_NATIVE_UINT        i;
    UINT32                  Prefix[3];


    /* Get the NameSegment */

    Name = AcpiPsGetName (Op);
    if (!Name)
    {
        return;
    }

    /* We are looking for _HID */

    if (!ACPI_COMPARE_NAME (&Name, METHOD_NAME__HID))
    {
        return;
    }

    /* The parameter must be either a word or a dword */

    NextOp = AcpiPsGetDepthNext (NULL, Op);
    if ((NextOp->Common.AmlOpcode != AML_DWORD_OP) &&
        (NextOp->Common.AmlOpcode != AML_WORD_OP))
    {
        return;
    }

    /* Swap from little-endian to big-endian to simplify conversion */

    BigEndianId = AcpiUtDwordByteSwap ((UINT32) NextOp->Common.Value.Integer);

    /* Create the 3 leading ASCII letters */

    Prefix[0] = ((BigEndianId >> 26) & 0x1F) + 0x40;
    Prefix[1] = ((BigEndianId >> 21) & 0x1F) + 0x40;
    Prefix[2] = ((BigEndianId >> 16) & 0x1F) + 0x40;

    /* Verify that all 3 are ascii and alpha */

    for (i = 0; i < 3; i++)
    {
        if (!ACPI_IS_ASCII (Prefix[i]) ||
            !ACPI_IS_ALPHA (Prefix[i]))
        {
            return;
        }
    }

    /* OK - mark this node as convertable to an EISA ID */

    NextOp->Common.DisasmOpcode = ACPI_DASM_EISAID;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDmEisaId
 *
 * PARAMETERS:  EncodedId       - Raw encoded EISA ID.
 *
 * RETURN:      None
 *
 * DESCRIPTION: Convert an encoded EISAID back to the original ASCII String.
 *
 ******************************************************************************/

void
AcpiDmEisaId (
    UINT32                  EncodedId)
{
    UINT32                  BigEndianId;


    /* Swap from little-endian to big-endian to simplify conversion */

    BigEndianId = AcpiUtDwordByteSwap (EncodedId);


    /* Split to form "AAANNNN" string */

    AcpiOsPrintf ("EisaId (\"%c%c%c%4.4X\")",

        /* Three Alpha characters (AAA), 5 bits each */

        (int) ((BigEndianId >> 26) & 0x1F) + 0x40,
        (int) ((BigEndianId >> 21) & 0x1F) + 0x40,
        (int) ((BigEndianId >> 16) & 0x1F) + 0x40,

        /* Numeric part (NNNN) is simply the lower 16 bits */

        (UINT32) (BigEndianId & 0xFFFF));
}

#endif