psargs.c

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/******************************************************************************
 *
 * Module Name: psargs - Parse AML opcode arguments
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2012, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acparser.h"
#include "amlcode.h"
#include "acnamesp.h"
#include "acdispat.h"

#define _COMPONENT          ACPI_PARSER
ACPI_MODULE_NAME("psargs")

/* Local prototypes */
static u32
acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state);

static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
                               *parser_state);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_next_package_length
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *
 * RETURN:      Decoded package length. On completion, the AML pointer points
 *              past the length byte or bytes.
 *
 * DESCRIPTION: Decode and return a package length field.
 *              Note: Largest package length is 28 bits, from ACPI specification
 *
 ******************************************************************************/

static u32
acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state)
{
    u8 *aml = parser_state->aml;
    u32 package_length = 0;
    u32 byte_count;
    u8 byte_zero_mask = 0x3F;   /* Default [0:5] */

    ACPI_FUNCTION_TRACE(ps_get_next_package_length);

    /*
     * Byte 0 bits [6:7] contain the number of additional bytes
     * used to encode the package length, either 0,1,2, or 3
     */
    byte_count = (aml[0] >> 6);
    parser_state->aml += ((acpi_size) byte_count + 1);

    /* Get bytes 3, 2, 1 as needed */

    while (byte_count) {
        /*
         * Final bit positions for the package length bytes:
         *      Byte3->[20:27]
         *      Byte2->[12:19]
         *      Byte1->[04:11]
         *      Byte0->[00:03]
         */
        package_length |= (aml[byte_count] << ((byte_count << 3) - 4));

        byte_zero_mask = 0x0F;  /* Use bits [0:3] of byte 0 */
        byte_count--;
    }

    /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */

    package_length |= (aml[0] & byte_zero_mask);
    return_UINT32(package_length);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_next_package_end
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *
 * RETURN:      Pointer to end-of-package +1
 *
 * DESCRIPTION: Get next package length and return a pointer past the end of
 *              the package.  Consumes the package length field
 *
 ******************************************************************************/

u8 *acpi_ps_get_next_package_end(struct acpi_parse_state *parser_state)
{
    u8 *start = parser_state->aml;
    u32 package_length;

    ACPI_FUNCTION_TRACE(ps_get_next_package_end);

    /* Function below updates parser_state->Aml */

    package_length = acpi_ps_get_next_package_length(parser_state);

    return_PTR(start + package_length); /* end of package */
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_next_namestring
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *
 * RETURN:      Pointer to the start of the name string (pointer points into
 *              the AML.
 *
 * DESCRIPTION: Get next raw namestring within the AML stream.  Handles all name
 *              prefix characters.  Set parser state to point past the string.
 *              (Name is consumed from the AML.)
 *
 ******************************************************************************/

char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
{
    u8 *start = parser_state->aml;
    u8 *end = parser_state->aml;

    ACPI_FUNCTION_TRACE(ps_get_next_namestring);

    /* Point past any namestring prefix characters (backslash or carat) */

    while (acpi_ps_is_prefix_char(*end)) {
        end++;
    }

    /* Decode the path prefix character */

    switch (*end) {
    case 0:

        /* null_name */

        if (end == start) {
            start = NULL;
        }
        end++;
        break;

    case AML_DUAL_NAME_PREFIX:

        /* Two name segments */

        end += 1 + (2 * ACPI_NAME_SIZE);
        break;

    case AML_MULTI_NAME_PREFIX_OP:

        /* Multiple name segments, 4 chars each, count in next byte */

        end += 2 + (*(end + 1) * ACPI_NAME_SIZE);
        break;

    default:

        /* Single name segment */

        end += ACPI_NAME_SIZE;
        break;
    }

    parser_state->aml = end;
    return_PTR((char *)start);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_next_namepath
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *              arg                 - Where the namepath will be stored
 *              arg_count           - If the namepath points to a control method
 *                                    the method's argument is returned here.
 *              possible_method_call - Whether the namepath can possibly be the
 *                                    start of a method call
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get next name (if method call, return # of required args).
 *              Names are looked up in the internal namespace to determine
 *              if the name represents a control method.  If a method
 *              is found, the number of arguments to the method is returned.
 *              This information is critical for parsing to continue correctly.
 *
 ******************************************************************************/

acpi_status
acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state,
              struct acpi_parse_state *parser_state,
              union acpi_parse_object *arg, u8 possible_method_call)
{
    acpi_status status;
    char *path;
    union acpi_parse_object *name_op;
    union acpi_operand_object *method_desc;
    struct acpi_namespace_node *node;
    u8 *start = parser_state->aml;

    ACPI_FUNCTION_TRACE(ps_get_next_namepath);

    path = acpi_ps_get_next_namestring(parser_state);
    acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);

    /* Null path case is allowed, just exit */

    if (!path) {
        arg->common.value.name = path;
        return_ACPI_STATUS(AE_OK);
    }

    /*
     * Lookup the name in the internal namespace, starting with the current
     * scope. We don't want to add anything new to the namespace here,
     * however, so we use MODE_EXECUTE.
     * Allow searching of the parent tree, but don't open a new scope -
     * we just want to lookup the object (must be mode EXECUTE to perform
     * the upsearch)
     */
    status = acpi_ns_lookup(walk_state->scope_info, path,
                ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
                ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
                NULL, &node);

    /*
     * If this name is a control method invocation, we must
     * setup the method call
     */
    if (ACPI_SUCCESS(status) &&
        possible_method_call && (node->type == ACPI_TYPE_METHOD)) {
        if (walk_state->opcode == AML_UNLOAD_OP) {
            /*
             * acpi_ps_get_next_namestring has increased the AML pointer,
             * so we need to restore the saved AML pointer for method call.
             */
            walk_state->parser_state.aml = start;
            walk_state->arg_count = 1;
            acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
            return_ACPI_STATUS(AE_OK);
        }

        /* This name is actually a control method invocation */

        method_desc = acpi_ns_get_attached_object(node);
        ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
                  "Control Method - %p Desc %p Path=%p\n", node,
                  method_desc, path));

        name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
        if (!name_op) {
            return_ACPI_STATUS(AE_NO_MEMORY);
        }

        /* Change Arg into a METHOD CALL and attach name to it */

        acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
        name_op->common.value.name = path;

        /* Point METHODCALL/NAME to the METHOD Node */

        name_op->common.node = node;
        acpi_ps_append_arg(arg, name_op);

        if (!method_desc) {
            ACPI_ERROR((AE_INFO,
                    "Control Method %p has no attached object",
                    node));
            return_ACPI_STATUS(AE_AML_INTERNAL);
        }

        ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
                  "Control Method - %p Args %X\n",
                  node, method_desc->method.param_count));

        /* Get the number of arguments to expect */

        walk_state->arg_count = method_desc->method.param_count;
        return_ACPI_STATUS(AE_OK);
    }

    /*
     * Special handling if the name was not found during the lookup -
     * some not_found cases are allowed
     */
    if (status == AE_NOT_FOUND) {

        /* 1) not_found is ok during load pass 1/2 (allow forward references) */

        if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) !=
            ACPI_PARSE_EXECUTE) {
            status = AE_OK;
        }

        /* 2) not_found during a cond_ref_of(x) is ok by definition */

        else if (walk_state->op->common.aml_opcode ==
             AML_COND_REF_OF_OP) {
            status = AE_OK;
        }

        /*
         * 3) not_found while building a Package is ok at this point, we
         * may flag as an error later if slack mode is not enabled.
         * (Some ASL code depends on allowing this behavior)
         */
        else if ((arg->common.parent) &&
             ((arg->common.parent->common.aml_opcode ==
               AML_PACKAGE_OP)
              || (arg->common.parent->common.aml_opcode ==
                  AML_VAR_PACKAGE_OP))) {
            status = AE_OK;
        }
    }

    /* Final exception check (may have been changed from code above) */

    if (ACPI_FAILURE(status)) {
        ACPI_ERROR_NAMESPACE(path, status);

        if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
            ACPI_PARSE_EXECUTE) {

            /* Report a control method execution error */

            status = acpi_ds_method_error(status, walk_state);
        }
    }

    /* Save the namepath */

    arg->common.value.name = path;
    return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_next_simple_arg
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *              arg_type            - The argument type (AML_*_ARG)
 *              arg                 - Where the argument is returned
 *
 * RETURN:      None
 *
 * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
 *
 ******************************************************************************/

void
acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state,
                u32 arg_type, union acpi_parse_object *arg)
{
    u32 length;
    u16 opcode;
    u8 *aml = parser_state->aml;

    ACPI_FUNCTION_TRACE_U32(ps_get_next_simple_arg, arg_type);

    switch (arg_type) {
    case ARGP_BYTEDATA:

        /* Get 1 byte from the AML stream */

        opcode = AML_BYTE_OP;
        arg->common.value.integer = (u64) *aml;
        length = 1;
        break;

    case ARGP_WORDDATA:

        /* Get 2 bytes from the AML stream */

        opcode = AML_WORD_OP;
        ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml);
        length = 2;
        break;

    case ARGP_DWORDDATA:

        /* Get 4 bytes from the AML stream */

        opcode = AML_DWORD_OP;
        ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml);
        length = 4;
        break;

    case ARGP_QWORDDATA:

        /* Get 8 bytes from the AML stream */

        opcode = AML_QWORD_OP;
        ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml);
        length = 8;
        break;

    case ARGP_CHARLIST:

        /* Get a pointer to the string, point past the string */

        opcode = AML_STRING_OP;
        arg->common.value.string = ACPI_CAST_PTR(char, aml);

        /* Find the null terminator */

        length = 0;
        while (aml[length]) {
            length++;
        }
        length++;
        break;

    case ARGP_NAME:
    case ARGP_NAMESTRING:

        acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
        arg->common.value.name =
            acpi_ps_get_next_namestring(parser_state);
        return_VOID;

    default:

        ACPI_ERROR((AE_INFO, "Invalid ArgType 0x%X", arg_type));
        return_VOID;
    }

    acpi_ps_init_op(arg, opcode);
    parser_state->aml += length;
    return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_next_field
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *
 * RETURN:      A newly allocated FIELD op
 *
 * DESCRIPTION: Get next field (named_field, reserved_field, or access_field)
 *
 ******************************************************************************/

static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
                               *parser_state)
{
    u32 aml_offset;
    union acpi_parse_object *field;
    union acpi_parse_object *arg = NULL;
    u16 opcode;
    u32 name;
    u8 access_type;
    u8 access_attribute;
    u8 access_length;
    u32 pkg_length;
    u8 *pkg_end;
    u32 buffer_length;

    ACPI_FUNCTION_TRACE(ps_get_next_field);

    aml_offset =
        (u32)ACPI_PTR_DIFF(parser_state->aml, parser_state->aml_start);

    /* Determine field type */

    switch (ACPI_GET8(parser_state->aml)) {
    case AML_FIELD_OFFSET_OP:

        opcode = AML_INT_RESERVEDFIELD_OP;
        parser_state->aml++;
        break;

    case AML_FIELD_ACCESS_OP:

        opcode = AML_INT_ACCESSFIELD_OP;
        parser_state->aml++;
        break;

    case AML_FIELD_CONNECTION_OP:

        opcode = AML_INT_CONNECTION_OP;
        parser_state->aml++;
        break;

    case AML_FIELD_EXT_ACCESS_OP:

        opcode = AML_INT_EXTACCESSFIELD_OP;
        parser_state->aml++;
        break;

    default:

        opcode = AML_INT_NAMEDFIELD_OP;
        break;
    }

    /* Allocate a new field op */

    field = acpi_ps_alloc_op(opcode);
    if (!field) {
        return_PTR(NULL);
    }

    field->common.aml_offset = aml_offset;

    /* Decode the field type */

    switch (opcode) {
    case AML_INT_NAMEDFIELD_OP:

        /* Get the 4-character name */

        ACPI_MOVE_32_TO_32(&name, parser_state->aml);
        acpi_ps_set_name(field, name);
        parser_state->aml += ACPI_NAME_SIZE;

        /* Get the length which is encoded as a package length */

        field->common.value.size =
            acpi_ps_get_next_package_length(parser_state);
        break;

    case AML_INT_RESERVEDFIELD_OP:

        /* Get the length which is encoded as a package length */

        field->common.value.size =
            acpi_ps_get_next_package_length(parser_state);
        break;

    case AML_INT_ACCESSFIELD_OP:
    case AML_INT_EXTACCESSFIELD_OP:

        /*
         * Get access_type and access_attrib and merge into the field Op
         * access_type is first operand, access_attribute is second. stuff
         * these bytes into the node integer value for convenience.
         */

        /* Get the two bytes (Type/Attribute) */

        access_type = ACPI_GET8(parser_state->aml);
        parser_state->aml++;
        access_attribute = ACPI_GET8(parser_state->aml);
        parser_state->aml++;

        field->common.value.integer = (u8)access_type;
        field->common.value.integer |= (u16)(access_attribute << 8);

        /* This opcode has a third byte, access_length */

        if (opcode == AML_INT_EXTACCESSFIELD_OP) {
            access_length = ACPI_GET8(parser_state->aml);
            parser_state->aml++;

            field->common.value.integer |=
                (u32)(access_length << 16);
        }
        break;

    case AML_INT_CONNECTION_OP:

        /*
         * Argument for Connection operator can be either a Buffer
         * (resource descriptor), or a name_string.
         */
        if (ACPI_GET8(parser_state->aml) == AML_BUFFER_OP) {
            parser_state->aml++;

            pkg_end = parser_state->aml;
            pkg_length =
                acpi_ps_get_next_package_length(parser_state);
            pkg_end += pkg_length;

            if (parser_state->aml < pkg_end) {

                /* Non-empty list */

                arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP);
                if (!arg) {
                    acpi_ps_free_op(field);
                    return_PTR(NULL);
                }

                /* Get the actual buffer length argument */

                opcode = ACPI_GET8(parser_state->aml);
                parser_state->aml++;

                switch (opcode) {
                case AML_BYTE_OP:   /* AML_BYTEDATA_ARG */
                    buffer_length =
                        ACPI_GET8(parser_state->aml);
                    parser_state->aml += 1;
                    break;

                case AML_WORD_OP:   /* AML_WORDDATA_ARG */
                    buffer_length =
                        ACPI_GET16(parser_state->aml);
                    parser_state->aml += 2;
                    break;

                case AML_DWORD_OP:  /* AML_DWORDATA_ARG */
                    buffer_length =
                        ACPI_GET32(parser_state->aml);
                    parser_state->aml += 4;
                    break;

                default:
                    buffer_length = 0;
                    break;
                }

                /* Fill in bytelist data */

                arg->named.value.size = buffer_length;
                arg->named.data = parser_state->aml;
            }

            /* Skip to End of byte data */

            parser_state->aml = pkg_end;
        } else {
            arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
            if (!arg) {
                acpi_ps_free_op(field);
                return_PTR(NULL);
            }

            /* Get the Namestring argument */

            arg->common.value.name =
                acpi_ps_get_next_namestring(parser_state);
        }

        /* Link the buffer/namestring to parent (CONNECTION_OP) */

        acpi_ps_append_arg(field, arg);
        break;

    default:

        /* Opcode was set in previous switch */
        break;
    }

    return_PTR(field);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_next_arg
 *
 * PARAMETERS:  walk_state          - Current state
 *              parser_state        - Current parser state object
 *              arg_type            - The argument type (AML_*_ARG)
 *              return_arg          - Where the next arg is returned
 *
 * RETURN:      Status, and an op object containing the next argument.
 *
 * DESCRIPTION: Get next argument (including complex list arguments that require
 *              pushing the parser stack)
 *
 ******************************************************************************/

acpi_status
acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
             struct acpi_parse_state *parser_state,
             u32 arg_type, union acpi_parse_object **return_arg)
{
    union acpi_parse_object *arg = NULL;
    union acpi_parse_object *prev = NULL;
    union acpi_parse_object *field;
    u32 subop;
    acpi_status status = AE_OK;

    ACPI_FUNCTION_TRACE_PTR(ps_get_next_arg, parser_state);

    switch (arg_type) {
    case ARGP_BYTEDATA:
    case ARGP_WORDDATA:
    case ARGP_DWORDDATA:
    case ARGP_CHARLIST:
    case ARGP_NAME:
    case ARGP_NAMESTRING:

        /* Constants, strings, and namestrings are all the same size */

        arg = acpi_ps_alloc_op(AML_BYTE_OP);
        if (!arg) {
            return_ACPI_STATUS(AE_NO_MEMORY);
        }
        acpi_ps_get_next_simple_arg(parser_state, arg_type, arg);
        break;

    case ARGP_PKGLENGTH:

        /* Package length, nothing returned */

        parser_state->pkg_end =
            acpi_ps_get_next_package_end(parser_state);
        break;

    case ARGP_FIELDLIST:

        if (parser_state->aml < parser_state->pkg_end) {

            /* Non-empty list */

            while (parser_state->aml < parser_state->pkg_end) {
                field = acpi_ps_get_next_field(parser_state);
                if (!field) {
                    return_ACPI_STATUS(AE_NO_MEMORY);
                }

                if (prev) {
                    prev->common.next = field;
                } else {
                    arg = field;
                }
                prev = field;
            }

            /* Skip to End of byte data */

            parser_state->aml = parser_state->pkg_end;
        }
        break;

    case ARGP_BYTELIST:

        if (parser_state->aml < parser_state->pkg_end) {

            /* Non-empty list */

            arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP);
            if (!arg) {
                return_ACPI_STATUS(AE_NO_MEMORY);
            }

            /* Fill in bytelist data */

            arg->common.value.size = (u32)
                ACPI_PTR_DIFF(parser_state->pkg_end,
                      parser_state->aml);
            arg->named.data = parser_state->aml;

            /* Skip to End of byte data */

            parser_state->aml = parser_state->pkg_end;
        }
        break;

    case ARGP_TARGET:
    case ARGP_SUPERNAME:
    case ARGP_SIMPLENAME:

        subop = acpi_ps_peek_opcode(parser_state);
        if (subop == 0 ||
            acpi_ps_is_leading_char(subop) ||
            acpi_ps_is_prefix_char(subop)) {

            /* null_name or name_string */

            arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
            if (!arg) {
                return_ACPI_STATUS(AE_NO_MEMORY);
            }

            /* To support super_name arg of Unload */

            if (walk_state->opcode == AML_UNLOAD_OP) {
                status =
                    acpi_ps_get_next_namepath(walk_state,
                                  parser_state, arg,
                                  1);

                /*
                 * If the super_name arg of Unload is a method call,
                 * we have restored the AML pointer, just free this Arg
                 */
                if (arg->common.aml_opcode ==
                    AML_INT_METHODCALL_OP) {
                    acpi_ps_free_op(arg);
                    arg = NULL;
                }
            } else {
                status =
                    acpi_ps_get_next_namepath(walk_state,
                                  parser_state, arg,
                                  0);
            }
        } else {
            /* Single complex argument, nothing returned */

            walk_state->arg_count = 1;
        }
        break;

    case ARGP_DATAOBJ:
    case ARGP_TERMARG:

        /* Single complex argument, nothing returned */

        walk_state->arg_count = 1;
        break;

    case ARGP_DATAOBJLIST:
    case ARGP_TERMLIST:
    case ARGP_OBJLIST:

        if (parser_state->aml < parser_state->pkg_end) {

            /* Non-empty list of variable arguments, nothing returned */

            walk_state->arg_count = ACPI_VAR_ARGS;
        }
        break;

    default:

        ACPI_ERROR((AE_INFO, "Invalid ArgType: 0x%X", arg_type));
        status = AE_AML_OPERAND_TYPE;
        break;
    }

    *return_arg = arg;
    return_ACPI_STATUS(status);
}