aslcodegen.c

acpi tools for linux include acpiexec and acpixtract

    switch (Op->Asl.AmlOpcode)
    {
    case AML_UNASSIGNED_OPCODE:

        /* These opcodes should not get here */

        printf ("Found a node with an unassigned AML opcode\n");
        fprintf (stderr, "Found a node with an unassigned AML opcode\n");
        return;

    case AML_INT_RESERVEDFIELD_OP:

        /* Special opcodes for within a field definition */

        Aml.Opcode = 0x00;
        break;

    case AML_INT_ACCESSFIELD_OP:

        Aml.Opcode = 0x01;
        break;

    default:
        Aml.Opcode = Op->Asl.AmlOpcode;
        break;
    }


    switch (Aml.Opcode)
    {
    case AML_PACKAGE_LENGTH:

        /* Value is the length to be encoded (Used in field definitions) */

        PkgLen.Len = (UINT32) Op->Asl.Value.Integer;
        break;

    default:

        /* Check for two-byte opcode */

        if (Aml.Opcode > 0x00FF)
        {
            /* Write the high byte first */

            CgLocalWriteAmlData (Op, &Aml.OpcodeBytes[1], 1);
        }

        CgLocalWriteAmlData (Op, &Aml.OpcodeBytes[0], 1);

        /* Subtreelength doesn't include length of package length bytes */

        PkgLen.Len = Op->Asl.AmlSubtreeLength + Op->Asl.AmlPkgLenBytes;
        break;
    }

    /* Does this opcode have an associated "PackageLength" field? */

    if (Op->Asl.CompileFlags & NODE_AML_PACKAGE)
    {
        if (Op->Asl.AmlPkgLenBytes == 1)
        {
            /* Simplest case -- no bytes to follow, just write the count */

            CgLocalWriteAmlData (Op, &PkgLen.LenBytes[0], 1);
        }
        else if (Op->Asl.AmlPkgLenBytes != 0)
        {
            /*
             * Encode the "bytes to follow" in the first byte, top two bits.
             * The low-order nybble of the length is in the bottom 4 bits
             */
            PkgLenFirstByte = (UINT8)
                (((UINT32) (Op->Asl.AmlPkgLenBytes - 1) << 6) |
                (PkgLen.LenBytes[0] & 0x0F));

            CgLocalWriteAmlData (Op, &PkgLenFirstByte, 1);

            /*
             * Shift the length over by the 4 bits we just stuffed
             * in the first byte
             */
            PkgLen.Len >>= 4;

            /* Now we can write the remaining bytes - either 1, 2, or 3 bytes */

            for (i = 0; i < (UINT32) (Op->Asl.AmlPkgLenBytes - 1); i++)
            {
                CgLocalWriteAmlData (Op, &PkgLen.LenBytes[i], 1);
            }
        }
    }

    switch (Aml.Opcode)
    {
    case AML_BYTE_OP:

        CgLocalWriteAmlData (Op, &Op->Asl.Value.Integer, 1);
        break;

    case AML_WORD_OP:

        CgLocalWriteAmlData (Op, &Op->Asl.Value.Integer, 2);
       break;

    case AML_DWORD_OP:

        CgLocalWriteAmlData (Op, &Op->Asl.Value.Integer, 4);
        break;

    case AML_QWORD_OP:

        CgLocalWriteAmlData (Op, &Op->Asl.Value.Integer, 8);
        break;

    case AML_STRING_OP:

        CgLocalWriteAmlData (Op, Op->Asl.Value.String, Op->Asl.AmlLength);
        break;

    default:
        /* All data opcodes must appear above */
        break;
    }
}


/*******************************************************************************
 *
 * FUNCTION:    CgWriteTableHeader
 *
 * PARAMETERS:  Op        - The DEFINITIONBLOCK node
 *
 * RETURN:      None
 *
 * DESCRIPTION: Write a table header corresponding to the DEFINITIONBLOCK
 *
 ******************************************************************************/

static void
CgWriteTableHeader (
    ACPI_PARSE_OBJECT       *Op)
{
    ACPI_PARSE_OBJECT       *Child;


    /* AML filename */

    Child = Op->Asl.Child;

    /* Signature */

    Child = Child->Asl.Next;
    strncpy (TableHeader.Signature, Child->Asl.Value.String, 4);

    /* Revision */

    Child = Child->Asl.Next;
    TableHeader.Revision = (UINT8) Child->Asl.Value.Integer;

    /* Command-line Revision override */

    if (Gbl_RevisionOverride)
    {
        TableHeader.Revision = Gbl_RevisionOverride;
    }

    /* OEMID */

    Child = Child->Asl.Next;
    strncpy (TableHeader.OemId, Child->Asl.Value.String, 6);

    /* OEM TableID */

    Child = Child->Asl.Next;
    strncpy (TableHeader.OemTableId, Child->Asl.Value.String, 8);

    /* OEM Revision */

    Child = Child->Asl.Next;
    TableHeader.OemRevision = (UINT32) Child->Asl.Value.Integer;

    /* Compiler ID */

    strncpy (TableHeader.AslCompilerId, CompilerCreatorId, 4);

    /* Compiler version */

    TableHeader.AslCompilerRevision = CompilerCreatorRevision;

    /* Table length. Checksum zero for now, will rewrite later */

    TableHeader.Length   = Gbl_TableLength;
    TableHeader.Checksum = 0;

    CgLocalWriteAmlData (Op, &TableHeader, sizeof (ACPI_TABLE_HEADER));
}


/*******************************************************************************
 *
 * FUNCTION:    CgCloseTable
 *
 * PARAMETERS:  None.
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Complete the ACPI table by calculating the checksum and
 *              re-writing the header.
 *
 ******************************************************************************/

static void
CgCloseTable (
    void)
{
    signed char         Sum;
    UINT8               FileByte;


    FlSeekFile (ASL_FILE_AML_OUTPUT, 0);
    Sum = 0;

    /* Calculate the checksum over the entire file */

    while (FlReadFile (ASL_FILE_AML_OUTPUT, &FileByte, 1) == AE_OK)
    {
        Sum = (signed char) (Sum + FileByte);
    }

    /* Re-write the table header with the checksum */

    TableHeader.Checksum = (UINT8) (0 - Sum);

    FlSeekFile (ASL_FILE_AML_OUTPUT, 0);
    CgLocalWriteAmlData (NULL, &TableHeader, sizeof (ACPI_TABLE_HEADER));
}


/*******************************************************************************
 *
 * FUNCTION:    CgWriteNode
 *
 * PARAMETERS:  Op            - Parse node to write.
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Write the AML that corresponds to a parse node.
 *
 ******************************************************************************/

static void
CgWriteNode (
    ACPI_PARSE_OBJECT       *Op)
{
    ASL_RESOURCE_NODE       *Rnode;


    /* Always check for DEFAULT_ARG and other "Noop" nodes */
    /* TBD: this may not be the best place for this check */

    if ((Op->Asl.ParseOpcode == PARSEOP_DEFAULT_ARG)  ||
        (Op->Asl.ParseOpcode == PARSEOP_EXTERNAL)     ||
        (Op->Asl.ParseOpcode == PARSEOP_INCLUDE)      ||
        (Op->Asl.ParseOpcode == PARSEOP_INCLUDE_END))
    {
        return;
    }

    Op->Asl.FinalAmlLength = 0;

    switch (Op->Asl.AmlOpcode)
    {
    case AML_RAW_DATA_BYTE:
    case AML_RAW_DATA_WORD:
    case AML_RAW_DATA_DWORD:
    case AML_RAW_DATA_QWORD:

        CgLocalWriteAmlData (Op, &Op->Asl.Value.Integer, Op->Asl.AmlLength);
        return;


    case AML_RAW_DATA_BUFFER:

        CgLocalWriteAmlData (Op, Op->Asl.Value.Buffer, Op->Asl.AmlLength);
        return;


    case AML_RAW_DATA_CHAIN:

        Rnode = ACPI_CAST_PTR (ASL_RESOURCE_NODE, Op->Asl.Value.Buffer);
        while (Rnode)
        {
            CgLocalWriteAmlData (Op, Rnode->Buffer, Rnode->BufferLength);
            Rnode = Rnode->Next;
        }
        return;

    default:
        /* Internal data opcodes must all appear above */
        break;
    }

    switch (Op->Asl.ParseOpcode)
    {
    case PARSEOP_DEFAULT_ARG:

        break;

    case PARSEOP_DEFINITIONBLOCK:

        CgWriteTableHeader (Op);
        break;

    case PARSEOP_NAMESEG:
    case PARSEOP_NAMESTRING:
    case PARSEOP_METHODCALL:

        CgLocalWriteAmlData (Op, Op->Asl.Value.String, Op->Asl.AmlLength);
        break;

    default:

        CgWriteAmlOpcode (Op);
        break;
    }
}