441 lines
12 KiB
C
441 lines
12 KiB
C
/*******************************************************************************
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*
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* Module Name: nsobject - Utilities for objects attached to namespace
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* table entries
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2007, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/acnamesp.h>
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nsobject")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_attach_object
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*
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* PARAMETERS: Node - Parent Node
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* Object - Object to be attached
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* Type - Type of object, or ACPI_TYPE_ANY if not
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* known
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*
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* RETURN: Status
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*
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* DESCRIPTION: Record the given object as the value associated with the
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* name whose acpi_handle is passed. If Object is NULL
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* and Type is ACPI_TYPE_ANY, set the name as having no value.
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* Note: Future may require that the Node->Flags field be passed
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* as a parameter.
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*
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* MUTEX: Assumes namespace is locked
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*
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******************************************************************************/
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acpi_status
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acpi_ns_attach_object(struct acpi_namespace_node *node,
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union acpi_operand_object *object, acpi_object_type type)
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{
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union acpi_operand_object *obj_desc;
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union acpi_operand_object *last_obj_desc;
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acpi_object_type object_type = ACPI_TYPE_ANY;
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ACPI_FUNCTION_TRACE(ns_attach_object);
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/*
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* Parameter validation
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*/
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if (!node) {
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/* Invalid handle */
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ACPI_ERROR((AE_INFO, "Null NamedObj handle"));
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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if (!object && (ACPI_TYPE_ANY != type)) {
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/* Null object */
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ACPI_ERROR((AE_INFO,
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"Null object, but type not ACPI_TYPE_ANY"));
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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if (ACPI_GET_DESCRIPTOR_TYPE(node) != ACPI_DESC_TYPE_NAMED) {
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/* Not a name handle */
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ACPI_ERROR((AE_INFO, "Invalid handle %p [%s]",
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node, acpi_ut_get_descriptor_name(node)));
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Check if this object is already attached */
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if (node->object == object) {
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Obj %p already installed in NameObj %p\n",
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object, node));
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return_ACPI_STATUS(AE_OK);
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}
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/* If null object, we will just install it */
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if (!object) {
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obj_desc = NULL;
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object_type = ACPI_TYPE_ANY;
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}
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/*
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* If the source object is a namespace Node with an attached object,
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* we will use that (attached) object
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*/
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else if ((ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) &&
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((struct acpi_namespace_node *)object)->object) {
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/*
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* Value passed is a name handle and that name has a
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* non-null value. Use that name's value and type.
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*/
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obj_desc = ((struct acpi_namespace_node *)object)->object;
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object_type = ((struct acpi_namespace_node *)object)->type;
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}
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/*
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* Otherwise, we will use the parameter object, but we must type
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* it first
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*/
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else {
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obj_desc = (union acpi_operand_object *)object;
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/* Use the given type */
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object_type = type;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Installing %p into Node %p [%4.4s]\n",
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obj_desc, node, acpi_ut_get_node_name(node)));
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/* Detach an existing attached object if present */
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if (node->object) {
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acpi_ns_detach_object(node);
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}
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if (obj_desc) {
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/*
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* Must increment the new value's reference count
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* (if it is an internal object)
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*/
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acpi_ut_add_reference(obj_desc);
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/*
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* Handle objects with multiple descriptors - walk
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* to the end of the descriptor list
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*/
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last_obj_desc = obj_desc;
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while (last_obj_desc->common.next_object) {
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last_obj_desc = last_obj_desc->common.next_object;
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}
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/* Install the object at the front of the object list */
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last_obj_desc->common.next_object = node->object;
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}
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node->type = (u8) object_type;
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node->object = obj_desc;
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_detach_object
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*
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* PARAMETERS: Node - A Namespace node whose object will be detached
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*
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* RETURN: None.
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*
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* DESCRIPTION: Detach/delete an object associated with a namespace node.
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* if the object is an allocated object, it is freed.
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* Otherwise, the field is simply cleared.
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*
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******************************************************************************/
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void acpi_ns_detach_object(struct acpi_namespace_node *node)
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{
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union acpi_operand_object *obj_desc;
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ACPI_FUNCTION_TRACE(ns_detach_object);
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obj_desc = node->object;
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if (!obj_desc ||
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(ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA)) {
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return_VOID;
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}
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/* Clear the entry in all cases */
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node->object = NULL;
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if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) == ACPI_DESC_TYPE_OPERAND) {
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node->object = obj_desc->common.next_object;
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if (node->object &&
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(ACPI_GET_OBJECT_TYPE(node->object) !=
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ACPI_TYPE_LOCAL_DATA)) {
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node->object = node->object->common.next_object;
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}
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}
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/* Reset the node type to untyped */
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node->type = ACPI_TYPE_ANY;
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Node %p [%4.4s] Object %p\n",
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node, acpi_ut_get_node_name(node), obj_desc));
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/* Remove one reference on the object (and all subobjects) */
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acpi_ut_remove_reference(obj_desc);
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_get_attached_object
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*
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* PARAMETERS: Node - Namespace node
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*
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* RETURN: Current value of the object field from the Node whose
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* handle is passed
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*
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* DESCRIPTION: Obtain the object attached to a namespace node.
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*
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******************************************************************************/
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union acpi_operand_object *acpi_ns_get_attached_object(struct
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acpi_namespace_node
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*node)
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{
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ACPI_FUNCTION_TRACE_PTR(ns_get_attached_object, node);
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if (!node) {
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ACPI_WARNING((AE_INFO, "Null Node ptr"));
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return_PTR(NULL);
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}
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if (!node->object ||
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((ACPI_GET_DESCRIPTOR_TYPE(node->object) != ACPI_DESC_TYPE_OPERAND)
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&& (ACPI_GET_DESCRIPTOR_TYPE(node->object) !=
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ACPI_DESC_TYPE_NAMED))
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|| (ACPI_GET_OBJECT_TYPE(node->object) == ACPI_TYPE_LOCAL_DATA)) {
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return_PTR(NULL);
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}
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return_PTR(node->object);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_get_secondary_object
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*
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* PARAMETERS: Node - Namespace node
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*
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* RETURN: Current value of the object field from the Node whose
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* handle is passed.
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*
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* DESCRIPTION: Obtain a secondary object associated with a namespace node.
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*
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******************************************************************************/
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union acpi_operand_object *acpi_ns_get_secondary_object(union
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acpi_operand_object
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*obj_desc)
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{
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ACPI_FUNCTION_TRACE_PTR(ns_get_secondary_object, obj_desc);
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if ((!obj_desc) ||
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(ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) ||
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(!obj_desc->common.next_object) ||
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(ACPI_GET_OBJECT_TYPE(obj_desc->common.next_object) ==
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ACPI_TYPE_LOCAL_DATA)) {
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return_PTR(NULL);
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}
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return_PTR(obj_desc->common.next_object);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_attach_data
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*
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* PARAMETERS: Node - Namespace node
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* Handler - Handler to be associated with the data
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* Data - Data to be attached
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*
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* RETURN: Status
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*
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* DESCRIPTION: Low-level attach data. Create and attach a Data object.
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*
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******************************************************************************/
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acpi_status
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acpi_ns_attach_data(struct acpi_namespace_node *node,
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acpi_object_handler handler, void *data)
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{
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union acpi_operand_object *prev_obj_desc;
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union acpi_operand_object *obj_desc;
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union acpi_operand_object *data_desc;
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/* We only allow one attachment per handler */
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prev_obj_desc = NULL;
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obj_desc = node->object;
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while (obj_desc) {
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if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
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(obj_desc->data.handler == handler)) {
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return (AE_ALREADY_EXISTS);
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}
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prev_obj_desc = obj_desc;
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obj_desc = obj_desc->common.next_object;
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}
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/* Create an internal object for the data */
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data_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_DATA);
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if (!data_desc) {
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return (AE_NO_MEMORY);
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}
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data_desc->data.handler = handler;
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data_desc->data.pointer = data;
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/* Install the data object */
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if (prev_obj_desc) {
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prev_obj_desc->common.next_object = data_desc;
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} else {
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node->object = data_desc;
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_detach_data
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*
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* PARAMETERS: Node - Namespace node
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* Handler - Handler associated with the data
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*
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* RETURN: Status
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*
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* DESCRIPTION: Low-level detach data. Delete the data node, but the caller
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* is responsible for the actual data.
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*
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******************************************************************************/
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acpi_status
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acpi_ns_detach_data(struct acpi_namespace_node * node,
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acpi_object_handler handler)
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{
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union acpi_operand_object *obj_desc;
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union acpi_operand_object *prev_obj_desc;
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prev_obj_desc = NULL;
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obj_desc = node->object;
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while (obj_desc) {
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if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
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(obj_desc->data.handler == handler)) {
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if (prev_obj_desc) {
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prev_obj_desc->common.next_object =
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obj_desc->common.next_object;
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} else {
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node->object = obj_desc->common.next_object;
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}
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acpi_ut_remove_reference(obj_desc);
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return (AE_OK);
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}
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prev_obj_desc = obj_desc;
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obj_desc = obj_desc->common.next_object;
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}
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return (AE_NOT_FOUND);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_get_attached_data
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*
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* PARAMETERS: Node - Namespace node
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* Handler - Handler associated with the data
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* Data - Where the data is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Low level interface to obtain data previously associated with
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* a namespace node.
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*
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******************************************************************************/
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acpi_status
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acpi_ns_get_attached_data(struct acpi_namespace_node * node,
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acpi_object_handler handler, void **data)
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{
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union acpi_operand_object *obj_desc;
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obj_desc = node->object;
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while (obj_desc) {
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if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_DATA) &&
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(obj_desc->data.handler == handler)) {
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*data = obj_desc->data.pointer;
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return (AE_OK);
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}
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obj_desc = obj_desc->common.next_object;
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}
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return (AE_NOT_FOUND);
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}
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