excreate.c

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/******************************************************************************
 *
 * Module Name: excreate - Named object creation
 *
 *****************************************************************************/

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

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("excreate")
#ifndef ACPI_NO_METHOD_EXECUTION
/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_create_alias
 *
 * PARAMETERS:  walk_state           - Current state, contains operands
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new named alias
 *
 ******************************************************************************/
acpi_status acpi_ex_create_alias(struct acpi_walk_state *walk_state)
{
    struct acpi_namespace_node *target_node;
    struct acpi_namespace_node *alias_node;
    acpi_status status = AE_OK;

    ACPI_FUNCTION_TRACE(ex_create_alias);

    /* Get the source/alias operands (both namespace nodes) */

    alias_node = (struct acpi_namespace_node *)walk_state->operands[0];
    target_node = (struct acpi_namespace_node *)walk_state->operands[1];

    if ((target_node->type == ACPI_TYPE_LOCAL_ALIAS) ||
        (target_node->type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
        /*
         * Dereference an existing alias so that we don't create a chain
         * of aliases.  With this code, we guarantee that an alias is
         * always exactly one level of indirection away from the
         * actual aliased name.
         */
        target_node =
            ACPI_CAST_PTR(struct acpi_namespace_node,
                  target_node->object);
    }

    /*
     * For objects that can never change (i.e., the NS node will
     * permanently point to the same object), we can simply attach
     * the object to the new NS node.  For other objects (such as
     * Integers, buffers, etc.), we have to point the Alias node
     * to the original Node.
     */
    switch (target_node->type) {

        /* For these types, the sub-object can change dynamically via a Store */

    case ACPI_TYPE_INTEGER:
    case ACPI_TYPE_STRING:
    case ACPI_TYPE_BUFFER:
    case ACPI_TYPE_PACKAGE:
    case ACPI_TYPE_BUFFER_FIELD:

        /*
         * These types open a new scope, so we need the NS node in order to access
         * any children.
         */
    case ACPI_TYPE_DEVICE:
    case ACPI_TYPE_POWER:
    case ACPI_TYPE_PROCESSOR:
    case ACPI_TYPE_THERMAL:
    case ACPI_TYPE_LOCAL_SCOPE:

        /*
         * The new alias has the type ALIAS and points to the original
         * NS node, not the object itself.
         */
        alias_node->type = ACPI_TYPE_LOCAL_ALIAS;
        alias_node->object =
            ACPI_CAST_PTR(union acpi_operand_object, target_node);
        break;

    case ACPI_TYPE_METHOD:

        /*
         * Control method aliases need to be differentiated
         */
        alias_node->type = ACPI_TYPE_LOCAL_METHOD_ALIAS;
        alias_node->object =
            ACPI_CAST_PTR(union acpi_operand_object, target_node);
        break;

    default:

        /* Attach the original source object to the new Alias Node */

        /*
         * The new alias assumes the type of the target, and it points
         * to the same object.  The reference count of the object has an
         * additional reference to prevent deletion out from under either the
         * target node or the alias Node
         */
        status = acpi_ns_attach_object(alias_node,
                           acpi_ns_get_attached_object
                           (target_node),
                           target_node->type);
        break;
    }

    /* Since both operands are Nodes, we don't need to delete them */

    return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_create_event
 *
 * PARAMETERS:  walk_state          - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new event object
 *
 ******************************************************************************/

acpi_status acpi_ex_create_event(struct acpi_walk_state *walk_state)
{
    acpi_status status;
    union acpi_operand_object *obj_desc;

    ACPI_FUNCTION_TRACE(ex_create_event);

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

    /*
     * Create the actual OS semaphore, with zero initial units -- meaning
     * that the event is created in an unsignalled state
     */
    status = acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0,
                      &obj_desc->event.os_semaphore);
    if (ACPI_FAILURE(status)) {
        goto cleanup;
    }

    /* Attach object to the Node */

    status =
        acpi_ns_attach_object((struct acpi_namespace_node *)walk_state->
                  operands[0], obj_desc, ACPI_TYPE_EVENT);

      cleanup:
    /*
     * Remove local reference to the object (on error, will cause deletion
     * of both object and semaphore if present.)
     */
    acpi_ut_remove_reference(obj_desc);
    return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_create_mutex
 *
 * PARAMETERS:  walk_state          - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new mutex object
 *
 *              Mutex (Name[0], sync_level[1])
 *
 ******************************************************************************/

acpi_status acpi_ex_create_mutex(struct acpi_walk_state *walk_state)
{
    acpi_status status = AE_OK;
    union acpi_operand_object *obj_desc;

    ACPI_FUNCTION_TRACE_PTR(ex_create_mutex, ACPI_WALK_OPERANDS);

    /* Create the new mutex object */

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

    /* Create the actual OS Mutex */

    status = acpi_os_create_mutex(&obj_desc->mutex.os_mutex);
    if (ACPI_FAILURE(status)) {
        goto cleanup;
    }

    /* Init object and attach to NS node */

    obj_desc->mutex.sync_level =
        (u8) walk_state->operands[1]->integer.value;
    obj_desc->mutex.node =
        (struct acpi_namespace_node *)walk_state->operands[0];

    status =
        acpi_ns_attach_object(obj_desc->mutex.node, obj_desc,
                  ACPI_TYPE_MUTEX);

      cleanup:
    /*
     * Remove local reference to the object (on error, will cause deletion
     * of both object and semaphore if present.)
     */
    acpi_ut_remove_reference(obj_desc);
    return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_create_region
 *
 * PARAMETERS:  aml_start           - Pointer to the region declaration AML
 *              aml_length          - Max length of the declaration AML
 *              space_id            - Address space ID for the region
 *              walk_state          - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new operation region object
 *
 ******************************************************************************/

acpi_status
acpi_ex_create_region(u8 * aml_start,
              u32 aml_length,
              u8 space_id, struct acpi_walk_state *walk_state)
{
    acpi_status status;
    union acpi_operand_object *obj_desc;
    struct acpi_namespace_node *node;
    union acpi_operand_object *region_obj2;

    ACPI_FUNCTION_TRACE(ex_create_region);

    /* Get the Namespace Node */

    node = walk_state->op->common.node;

    /*
     * If the region object is already attached to this node,
     * just return
     */
    if (acpi_ns_get_attached_object(node)) {
        return_ACPI_STATUS(AE_OK);
    }

    /*
     * Space ID must be one of the predefined IDs, or in the user-defined
     * range
     */
    if (!acpi_is_valid_space_id(space_id)) {
        /*
         * Print an error message, but continue. We don't want to abort
         * a table load for this exception. Instead, if the region is
         * actually used at runtime, abort the executing method.
         */
        ACPI_ERROR((AE_INFO,
                "Invalid/unknown Address Space ID: 0x%2.2X",
                space_id));
    }

    ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Region Type - %s (0x%X)\n",
              acpi_ut_get_region_name(space_id), space_id));

    /* Create the region descriptor */

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

    /*
     * Remember location in AML stream of address & length
     * operands since they need to be evaluated at run time.
     */
    region_obj2 = obj_desc->common.next_object;
    region_obj2->extra.aml_start = aml_start;
    region_obj2->extra.aml_length = aml_length;
    if (walk_state->scope_info) {
        region_obj2->extra.scope_node =
            walk_state->scope_info->scope.node;
    } else {
        region_obj2->extra.scope_node = node;
    }

    /* Init the region from the operands */

    obj_desc->region.space_id = space_id;
    obj_desc->region.address = 0;
    obj_desc->region.length = 0;
    obj_desc->region.node = node;

    /* Install the new region object in the parent Node */

    status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_REGION);

      cleanup:

    /* Remove local reference to the object */

    acpi_ut_remove_reference(obj_desc);
    return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_create_processor
 *
 * PARAMETERS:  walk_state          - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new processor object and populate the fields
 *
 *              Processor (Name[0], cpu_ID[1], pblock_addr[2], pblock_length[3])
 *
 ******************************************************************************/

acpi_status acpi_ex_create_processor(struct acpi_walk_state *walk_state)
{
    union acpi_operand_object **operand = &walk_state->operands[0];
    union acpi_operand_object *obj_desc;
    acpi_status status;

    ACPI_FUNCTION_TRACE_PTR(ex_create_processor, walk_state);

    /* Create the processor object */

    obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PROCESSOR);
    if (!obj_desc) {
        return_ACPI_STATUS(AE_NO_MEMORY);
    }

    /* Initialize the processor object from the operands */

    obj_desc->processor.proc_id = (u8) operand[1]->integer.value;
    obj_desc->processor.length = (u8) operand[3]->integer.value;
    obj_desc->processor.address =
        (acpi_io_address) operand[2]->integer.value;

    /* Install the processor object in the parent Node */

    status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
                       obj_desc, ACPI_TYPE_PROCESSOR);

    /* Remove local reference to the object */

    acpi_ut_remove_reference(obj_desc);
    return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_create_power_resource
 *
 * PARAMETERS:  walk_state          - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new power_resource object and populate the fields
 *
 *              power_resource (Name[0], system_level[1], resource_order[2])
 *
 ******************************************************************************/

acpi_status acpi_ex_create_power_resource(struct acpi_walk_state *walk_state)
{
    union acpi_operand_object **operand = &walk_state->operands[0];
    acpi_status status;
    union acpi_operand_object *obj_desc;

    ACPI_FUNCTION_TRACE_PTR(ex_create_power_resource, walk_state);

    /* Create the power resource object */

    obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_POWER);
    if (!obj_desc) {
        return_ACPI_STATUS(AE_NO_MEMORY);
    }

    /* Initialize the power object from the operands */

    obj_desc->power_resource.system_level = (u8) operand[1]->integer.value;
    obj_desc->power_resource.resource_order =
        (u16) operand[2]->integer.value;

    /* Install the  power resource object in the parent Node */

    status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
                       obj_desc, ACPI_TYPE_POWER);

    /* Remove local reference to the object */

    acpi_ut_remove_reference(obj_desc);
    return_ACPI_STATUS(status);
}
#endif

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_create_method
 *
 * PARAMETERS:  aml_start       - First byte of the method's AML
 *              aml_length      - AML byte count for this method
 *              walk_state      - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new method object
 *
 ******************************************************************************/

acpi_status
acpi_ex_create_method(u8 * aml_start,
              u32 aml_length, struct acpi_walk_state *walk_state)
{
    union acpi_operand_object **operand = &walk_state->operands[0];
    union acpi_operand_object *obj_desc;
    acpi_status status;
    u8 method_flags;

    ACPI_FUNCTION_TRACE_PTR(ex_create_method, walk_state);

    /* Create a new method object */

    obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
    if (!obj_desc) {
        status = AE_NO_MEMORY;
        goto exit;
    }

    /* Save the method's AML pointer and length  */

    obj_desc->method.aml_start = aml_start;
    obj_desc->method.aml_length = aml_length;

    /*
     * Disassemble the method flags. Split off the arg_count, Serialized
     * flag, and sync_level for efficiency.
     */
    method_flags = (u8) operand[1]->integer.value;

    obj_desc->method.param_count =
        (u8) (method_flags & AML_METHOD_ARG_COUNT);

    /*
     * Get the sync_level. If method is serialized, a mutex will be
     * created for this method when it is parsed.
     */
    if (method_flags & AML_METHOD_SERIALIZED) {
        obj_desc->method.info_flags = ACPI_METHOD_SERIALIZED;

        /*
         * ACPI 1.0: sync_level = 0
         * ACPI 2.0: sync_level = sync_level in method declaration
         */
        obj_desc->method.sync_level = (u8)
            ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
    }

    /* Attach the new object to the method Node */

    status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
                       obj_desc, ACPI_TYPE_METHOD);

    /* Remove local reference to the object */

    acpi_ut_remove_reference(obj_desc);

      exit:
    /* Remove a reference to the operand */

    acpi_ut_remove_reference(operand[1]);
    return_ACPI_STATUS(status);
}