dsfield.c

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/******************************************************************************
 *
 * Module Name: dsfield - Dispatcher field routines
 *
 *****************************************************************************/

/*
 * 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 "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acparser.h"

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dsfield")

/* Local prototypes */
#ifdef ACPI_ASL_COMPILER
#include "acdisasm.h"
static acpi_status
acpi_ds_create_external_region(acpi_status lookup_status,
                   union acpi_parse_object *op,
                   char *path,
                   struct acpi_walk_state *walk_state,
                   struct acpi_namespace_node **node);
#endif

static acpi_status
acpi_ds_get_field_names(struct acpi_create_field_info *info,
            struct acpi_walk_state *walk_state,
            union acpi_parse_object *arg);

#ifdef ACPI_ASL_COMPILER
/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_create_external_region (iASL Disassembler only)
 *
 * PARAMETERS:  lookup_status   - Status from ns_lookup operation
 *              op              - Op containing the Field definition and args
 *              path            - Pathname of the region
 *  `           walk_state      - Current method state
 *              node            - Where the new region node is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Add region to the external list if NOT_FOUND. Create a new
 *              region node/object.
 *
 ******************************************************************************/

static acpi_status
acpi_ds_create_external_region(acpi_status lookup_status,
                   union acpi_parse_object *op,
                   char *path,
                   struct acpi_walk_state *walk_state,
                   struct acpi_namespace_node **node)
{
    acpi_status status;
    union acpi_operand_object *obj_desc;

    if (lookup_status != AE_NOT_FOUND) {
        return (lookup_status);
    }

    /*
     * Table disassembly:
     * operation_region not found. Generate an External for it, and
     * insert the name into the namespace.
     */
    acpi_dm_add_to_external_list(op, path, ACPI_TYPE_REGION, 0);
    status = acpi_ns_lookup(walk_state->scope_info, path, ACPI_TYPE_REGION,
                ACPI_IMODE_LOAD_PASS1, ACPI_NS_SEARCH_PARENT,
                walk_state, node);
    if (ACPI_FAILURE(status)) {
        return (status);
    }

    /* Must create and install a region object for the new node */

    obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION);
    if (!obj_desc) {
        return (AE_NO_MEMORY);
    }

    obj_desc->region.node = *node;
    status = acpi_ns_attach_object(*node, obj_desc, ACPI_TYPE_REGION);
    return (status);
}
#endif

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_create_buffer_field
 *
 * PARAMETERS:  op                  - Current parse op (create_XXField)
 *              walk_state          - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute the create_field operators:
 *              create_bit_field_op,
 *              create_byte_field_op,
 *              create_word_field_op,
 *              create_dword_field_op,
 *              create_qword_field_op,
 *              create_field_op     (all of which define a field in a buffer)
 *
 ******************************************************************************/

acpi_status
acpi_ds_create_buffer_field(union acpi_parse_object *op,
                struct acpi_walk_state *walk_state)
{
    union acpi_parse_object *arg;
    struct acpi_namespace_node *node;
    acpi_status status;
    union acpi_operand_object *obj_desc;
    union acpi_operand_object *second_desc = NULL;
    u32 flags;

    ACPI_FUNCTION_TRACE(ds_create_buffer_field);

    /*
     * Get the name_string argument (name of the new buffer_field)
     */
    if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {

        /* For create_field, name is the 4th argument */

        arg = acpi_ps_get_arg(op, 3);
    } else {
        /* For all other create_XXXField operators, name is the 3rd argument */

        arg = acpi_ps_get_arg(op, 2);
    }

    if (!arg) {
        return_ACPI_STATUS(AE_AML_NO_OPERAND);
    }

    if (walk_state->deferred_node) {
        node = walk_state->deferred_node;
        status = AE_OK;
    } else {
        /* Execute flag should always be set when this function is entered */

        if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
            return_ACPI_STATUS(AE_AML_INTERNAL);
        }

        /* Creating new namespace node, should not already exist */

        flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
            ACPI_NS_ERROR_IF_FOUND;

        /*
         * Mark node temporary if we are executing a normal control
         * method. (Don't mark if this is a module-level code method)
         */
        if (walk_state->method_node &&
            !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
            flags |= ACPI_NS_TEMPORARY;
        }

        /* Enter the name_string into the namespace */

        status =
            acpi_ns_lookup(walk_state->scope_info,
                   arg->common.value.string, ACPI_TYPE_ANY,
                   ACPI_IMODE_LOAD_PASS1, flags, walk_state,
                   &node);
        if (ACPI_FAILURE(status)) {
            ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
            return_ACPI_STATUS(status);
        }
    }

    /*
     * We could put the returned object (Node) on the object stack for later,
     * but for now, we will put it in the "op" object that the parser uses,
     * so we can get it again at the end of this scope.
     */
    op->common.node = node;

    /*
     * If there is no object attached to the node, this node was just created
     * and we need to create the field object. Otherwise, this was a lookup
     * of an existing node and we don't want to create the field object again.
     */
    obj_desc = acpi_ns_get_attached_object(node);
    if (obj_desc) {
        return_ACPI_STATUS(AE_OK);
    }

    /*
     * The Field definition is not fully parsed at this time.
     * (We must save the address of the AML for the buffer and index operands)
     */

    /* Create the buffer field object */

    obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER_FIELD);
    if (!obj_desc) {
        status = AE_NO_MEMORY;
        goto cleanup;
    }

    /*
     * Remember location in AML stream of the field unit opcode and operands --
     * since the buffer and index operands must be evaluated.
     */
    second_desc = obj_desc->common.next_object;
    second_desc->extra.aml_start = op->named.data;
    second_desc->extra.aml_length = op->named.length;
    obj_desc->buffer_field.node = node;

    /* Attach constructed field descriptors to parent node */

    status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_BUFFER_FIELD);
    if (ACPI_FAILURE(status)) {
        goto cleanup;
    }

      cleanup:

    /* Remove local reference to the object */

    acpi_ut_remove_reference(obj_desc);
    return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_get_field_names
 *
 * PARAMETERS:  info            - create_field info structure
 *  `           walk_state      - Current method state
 *              arg             - First parser arg for the field name list
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Process all named fields in a field declaration.  Names are
 *              entered into the namespace.
 *
 ******************************************************************************/

static acpi_status
acpi_ds_get_field_names(struct acpi_create_field_info *info,
            struct acpi_walk_state *walk_state,
            union acpi_parse_object *arg)
{
    acpi_status status;
    u64 position;
    union acpi_parse_object *child;

    ACPI_FUNCTION_TRACE_PTR(ds_get_field_names, info);

    /* First field starts at bit zero */

    info->field_bit_position = 0;

    /* Process all elements in the field list (of parse nodes) */

    while (arg) {
        /*
         * Four types of field elements are handled:
         * 1) name - Enters a new named field into the namespace
         * 2) offset - specifies a bit offset
         * 3) access_as - changes the access mode/attributes
         * 4) connection - Associate a resource template with the field
         */
        switch (arg->common.aml_opcode) {
        case AML_INT_RESERVEDFIELD_OP:

            position = (u64) info->field_bit_position
                + (u64) arg->common.value.size;

            if (position > ACPI_UINT32_MAX) {
                ACPI_ERROR((AE_INFO,
                        "Bit offset within field too large (> 0xFFFFFFFF)"));
                return_ACPI_STATUS(AE_SUPPORT);
            }

            info->field_bit_position = (u32) position;
            break;

        case AML_INT_ACCESSFIELD_OP:
        case AML_INT_EXTACCESSFIELD_OP:
            /*
             * Get new access_type, access_attribute, and access_length fields
             * -- to be used for all field units that follow, until the
             * end-of-field or another access_as keyword is encountered.
             * NOTE. These three bytes are encoded in the integer value
             * of the parseop for convenience.
             *
             * In field_flags, preserve the flag bits other than the
             * ACCESS_TYPE bits.
             */

            /* access_type (byte_acc, word_acc, etc.) */

            info->field_flags = (u8)
                ((info->
                  field_flags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
                 ((u8)((u32)(arg->common.value.integer & 0x07))));

            /* access_attribute (attrib_quick, attrib_byte, etc.) */

            info->attribute =
                (u8)((arg->common.value.integer >> 8) & 0xFF);

            /* access_length (for serial/buffer protocols) */

            info->access_length =
                (u8)((arg->common.value.integer >> 16) & 0xFF);
            break;

        case AML_INT_CONNECTION_OP:
            /*
             * Clear any previous connection. New connection is used for all
             * fields that follow, similar to access_as
             */
            info->resource_buffer = NULL;
            info->connection_node = NULL;

            /*
             * A Connection() is either an actual resource descriptor (buffer)
             * or a named reference to a resource template
             */
            child = arg->common.value.arg;
            if (child->common.aml_opcode == AML_INT_BYTELIST_OP) {
                info->resource_buffer = child->named.data;
                info->resource_length =
                    (u16)child->named.value.integer;
            } else {
                /* Lookup the Connection() namepath, it should already exist */

                status = acpi_ns_lookup(walk_state->scope_info,
                            child->common.value.
                            name, ACPI_TYPE_ANY,
                            ACPI_IMODE_EXECUTE,
                            ACPI_NS_DONT_OPEN_SCOPE,
                            walk_state,
                            &info->connection_node);
                if (ACPI_FAILURE(status)) {
                    ACPI_ERROR_NAMESPACE(child->common.
                                 value.name,
                                 status);
                    return_ACPI_STATUS(status);
                }
            }
            break;

        case AML_INT_NAMEDFIELD_OP:

            /* Lookup the name, it should already exist */

            status = acpi_ns_lookup(walk_state->scope_info,
                        (char *)&arg->named.name,
                        info->field_type,
                        ACPI_IMODE_EXECUTE,
                        ACPI_NS_DONT_OPEN_SCOPE,
                        walk_state, &info->field_node);
            if (ACPI_FAILURE(status)) {
                ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
                             status);
                return_ACPI_STATUS(status);
            } else {
                arg->common.node = info->field_node;
                info->field_bit_length = arg->common.value.size;

                /*
                 * If there is no object attached to the node, this node was
                 * just created and we need to create the field object.
                 * Otherwise, this was a lookup of an existing node and we
                 * don't want to create the field object again.
                 */
                if (!acpi_ns_get_attached_object
                    (info->field_node)) {
                    status = acpi_ex_prep_field_value(info);
                    if (ACPI_FAILURE(status)) {
                        return_ACPI_STATUS(status);
                    }
                }
            }

            /* Keep track of bit position for the next field */

            position = (u64) info->field_bit_position
                + (u64) arg->common.value.size;

            if (position > ACPI_UINT32_MAX) {
                ACPI_ERROR((AE_INFO,
                        "Field [%4.4s] bit offset too large (> 0xFFFFFFFF)",
                        ACPI_CAST_PTR(char,
                              &info->field_node->
                              name)));
                return_ACPI_STATUS(AE_SUPPORT);
            }

            info->field_bit_position += info->field_bit_length;
            break;

        default:

            ACPI_ERROR((AE_INFO,
                    "Invalid opcode in field list: 0x%X",
                    arg->common.aml_opcode));
            return_ACPI_STATUS(AE_AML_BAD_OPCODE);
        }

        arg = arg->common.next;
    }

    return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_create_field
 *
 * PARAMETERS:  op              - Op containing the Field definition and args
 *              region_node     - Object for the containing Operation Region
 *  `           walk_state      - Current method state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new field in the specified operation region
 *
 ******************************************************************************/

acpi_status
acpi_ds_create_field(union acpi_parse_object *op,
             struct acpi_namespace_node *region_node,
             struct acpi_walk_state *walk_state)
{
    acpi_status status;
    union acpi_parse_object *arg;
    struct acpi_create_field_info info;

    ACPI_FUNCTION_TRACE_PTR(ds_create_field, op);

    /* First arg is the name of the parent op_region (must already exist) */

    arg = op->common.value.arg;

    if (!region_node) {
        status =
            acpi_ns_lookup(walk_state->scope_info,
                   arg->common.value.name, ACPI_TYPE_REGION,
                   ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
                   walk_state, &region_node);
#ifdef ACPI_ASL_COMPILER
        status = acpi_ds_create_external_region(status, arg,
                            arg->common.value.name,
                            walk_state,
                            &region_node);
#endif
        if (ACPI_FAILURE(status)) {
            ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
            return_ACPI_STATUS(status);
        }
    }

    ACPI_MEMSET(&info, 0, sizeof(struct acpi_create_field_info));

    /* Second arg is the field flags */

    arg = arg->common.next;
    info.field_flags = (u8) arg->common.value.integer;
    info.attribute = 0;

    /* Each remaining arg is a Named Field */

    info.field_type = ACPI_TYPE_LOCAL_REGION_FIELD;
    info.region_node = region_node;

    status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
    return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_init_field_objects
 *
 * PARAMETERS:  op              - Op containing the Field definition and args
 *  `           walk_state      - Current method state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: For each "Field Unit" name in the argument list that is
 *              part of the field declaration, enter the name into the
 *              namespace.
 *
 ******************************************************************************/

acpi_status
acpi_ds_init_field_objects(union acpi_parse_object *op,
               struct acpi_walk_state *walk_state)
{
    acpi_status status;
    union acpi_parse_object *arg = NULL;
    struct acpi_namespace_node *node;
    u8 type = 0;
    u32 flags;

    ACPI_FUNCTION_TRACE_PTR(ds_init_field_objects, op);

    /* Execute flag should always be set when this function is entered */

    if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
        if (walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP) {

            /* bank_field Op is deferred, just return OK */

            return_ACPI_STATUS(AE_OK);
        }

        return_ACPI_STATUS(AE_AML_INTERNAL);
    }

    /*
     * Get the field_list argument for this opcode. This is the start of the
     * list of field elements.
     */
    switch (walk_state->opcode) {
    case AML_FIELD_OP:
        arg = acpi_ps_get_arg(op, 2);
        type = ACPI_TYPE_LOCAL_REGION_FIELD;
        break;

    case AML_BANK_FIELD_OP:
        arg = acpi_ps_get_arg(op, 4);
        type = ACPI_TYPE_LOCAL_BANK_FIELD;
        break;

    case AML_INDEX_FIELD_OP:
        arg = acpi_ps_get_arg(op, 3);
        type = ACPI_TYPE_LOCAL_INDEX_FIELD;
        break;

    default:
        return_ACPI_STATUS(AE_BAD_PARAMETER);
    }

    /* Creating new namespace node(s), should not already exist */

    flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
        ACPI_NS_ERROR_IF_FOUND;

    /*
     * Mark node(s) temporary if we are executing a normal control
     * method. (Don't mark if this is a module-level code method)
     */
    if (walk_state->method_node &&
        !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
        flags |= ACPI_NS_TEMPORARY;
    }

    /*
     * Walk the list of entries in the field_list
     * Note: field_list can be of zero length. In this case, Arg will be NULL.
     */
    while (arg) {
        /*
         * Ignore OFFSET/ACCESSAS/CONNECTION terms here; we are only interested
         * in the field names in order to enter them into the namespace.
         */
        if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
            status = acpi_ns_lookup(walk_state->scope_info,
                        (char *)&arg->named.name, type,
                        ACPI_IMODE_LOAD_PASS1, flags,
                        walk_state, &node);
            if (ACPI_FAILURE(status)) {
                ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
                             status);
                if (status != AE_ALREADY_EXISTS) {
                    return_ACPI_STATUS(status);
                }

                /* Name already exists, just ignore this error */

                status = AE_OK;
            }

            arg->common.node = node;
        }

        /* Get the next field element in the list */

        arg = arg->common.next;
    }

    return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_create_bank_field
 *
 * PARAMETERS:  op              - Op containing the Field definition and args
 *              region_node     - Object for the containing Operation Region
 *              walk_state      - Current method state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new bank field in the specified operation region
 *
 ******************************************************************************/

acpi_status
acpi_ds_create_bank_field(union acpi_parse_object *op,
              struct acpi_namespace_node *region_node,
              struct acpi_walk_state *walk_state)
{
    acpi_status status;
    union acpi_parse_object *arg;
    struct acpi_create_field_info info;

    ACPI_FUNCTION_TRACE_PTR(ds_create_bank_field, op);

    /* First arg is the name of the parent op_region (must already exist) */

    arg = op->common.value.arg;
    if (!region_node) {
        status =
            acpi_ns_lookup(walk_state->scope_info,
                   arg->common.value.name, ACPI_TYPE_REGION,
                   ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
                   walk_state, &region_node);
#ifdef ACPI_ASL_COMPILER
        status = acpi_ds_create_external_region(status, arg,
                            arg->common.value.name,
                            walk_state,
                            &region_node);
#endif
        if (ACPI_FAILURE(status)) {
            ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
            return_ACPI_STATUS(status);
        }
    }

    /* Second arg is the Bank Register (Field) (must already exist) */

    arg = arg->common.next;
    status =
        acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
               ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
               ACPI_NS_SEARCH_PARENT, walk_state,
               &info.register_node);
    if (ACPI_FAILURE(status)) {
        ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
        return_ACPI_STATUS(status);
    }

    /*
     * Third arg is the bank_value
     * This arg is a term_arg, not a constant
     * It will be evaluated later, by acpi_ds_eval_bank_field_operands
     */
    arg = arg->common.next;

    /* Fourth arg is the field flags */

    arg = arg->common.next;
    info.field_flags = (u8) arg->common.value.integer;

    /* Each remaining arg is a Named Field */

    info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
    info.region_node = region_node;

    /*
     * Use Info.data_register_node to store bank_field Op
     * It's safe because data_register_node will never be used when create bank field
     * We store aml_start and aml_length in the bank_field Op for late evaluation
     * Used in acpi_ex_prep_field_value(Info)
     *
     * TBD: Or, should we add a field in struct acpi_create_field_info, like "void *ParentOp"?
     */
    info.data_register_node = (struct acpi_namespace_node *)op;

    status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
    return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_create_index_field
 *
 * PARAMETERS:  op              - Op containing the Field definition and args
 *              region_node     - Object for the containing Operation Region
 *  `           walk_state      - Current method state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new index field in the specified operation region
 *
 ******************************************************************************/

acpi_status
acpi_ds_create_index_field(union acpi_parse_object *op,
               struct acpi_namespace_node *region_node,
               struct acpi_walk_state *walk_state)
{
    acpi_status status;
    union acpi_parse_object *arg;
    struct acpi_create_field_info info;

    ACPI_FUNCTION_TRACE_PTR(ds_create_index_field, op);

    /* First arg is the name of the Index register (must already exist) */

    arg = op->common.value.arg;
    status =
        acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
               ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
               ACPI_NS_SEARCH_PARENT, walk_state,
               &info.register_node);
    if (ACPI_FAILURE(status)) {
        ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
        return_ACPI_STATUS(status);
    }

    /* Second arg is the data register (must already exist) */

    arg = arg->common.next;
    status =
        acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
               ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
               ACPI_NS_SEARCH_PARENT, walk_state,
               &info.data_register_node);
    if (ACPI_FAILURE(status)) {
        ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
        return_ACPI_STATUS(status);
    }

    /* Next arg is the field flags */

    arg = arg->common.next;
    info.field_flags = (u8) arg->common.value.integer;

    /* Each remaining arg is a Named Field */

    info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
    info.region_node = region_node;

    status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
    return_ACPI_STATUS(status);
}