nsobject.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:7k
- /*******************************************************************************
- *
- * Module Name: nsobject - Utilities for objects attached to namespace
- * table entries
- * $Revision: 67 $
- *
- ******************************************************************************/
- /*
- * Copyright (C) 2000, 2001 R. Byron Moore
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include "acpi.h"
- #include "amlcode.h"
- #include "acnamesp.h"
- #include "acinterp.h"
- #include "actables.h"
- #define _COMPONENT ACPI_NAMESPACE
- MODULE_NAME ("nsobject")
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_attach_object
- *
- * PARAMETERS: Node - Parent Node
- * Object - Object to be attached
- * Type - Type of object, or ACPI_TYPE_ANY if not
- * known
- *
- * DESCRIPTION: Record the given object as the value associated with the
- * name whose acpi_handle is passed. If Object is NULL
- * and Type is ACPI_TYPE_ANY, set the name as having no value.
- *
- * MUTEX: Assumes namespace is locked
- *
- ******************************************************************************/
- acpi_status
- acpi_ns_attach_object (
- acpi_namespace_node *node,
- acpi_operand_object *object,
- acpi_object_type8 type)
- {
- acpi_operand_object *obj_desc;
- acpi_operand_object *previous_obj_desc;
- acpi_object_type8 obj_type = ACPI_TYPE_ANY;
- u8 flags;
- FUNCTION_TRACE ("Ns_attach_object");
- /*
- * Parameter validation
- */
- if (!acpi_gbl_root_node) {
- /* Name space not initialized */
- REPORT_ERROR (("Ns_attach_object: Namespace not initializedn"));
- return_ACPI_STATUS (AE_NO_NAMESPACE);
- }
- if (!node) {
- /* Invalid handle */
- REPORT_ERROR (("Ns_attach_object: Null Named_obj handlen"));
- return_ACPI_STATUS (AE_BAD_PARAMETER);
- }
- if (!object && (ACPI_TYPE_ANY != type)) {
- /* Null object */
- REPORT_ERROR (("Ns_attach_object: Null object, but type not ACPI_TYPE_ANYn"));
- return_ACPI_STATUS (AE_BAD_PARAMETER);
- }
- if (!VALID_DESCRIPTOR_TYPE (node, ACPI_DESC_TYPE_NAMED)) {
- /* Not a name handle */
- REPORT_ERROR (("Ns_attach_object: Invalid handlen"));
- return_ACPI_STATUS (AE_BAD_PARAMETER);
- }
- /* Check if this object is already attached */
- if (node->object == object) {
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj %p already installed in Name_obj %pn",
- object, node));
- return_ACPI_STATUS (AE_OK);
- }
- /* Get the current flags field of the Node */
- flags = node->flags;
- flags &= ~ANOBJ_AML_ATTACHMENT;
- /* If null object, we will just install it */
- if (!object) {
- obj_desc = NULL;
- obj_type = ACPI_TYPE_ANY;
- }
- /*
- * If the source object is a namespace Node with an attached object,
- * we will use that (attached) object
- */
- else if (VALID_DESCRIPTOR_TYPE (object, ACPI_DESC_TYPE_NAMED) &&
- ((acpi_namespace_node *) object)->object) {
- /*
- * Value passed is a name handle and that name has a
- * non-null value. Use that name's value and type.
- */
- obj_desc = ((acpi_namespace_node *) object)->object;
- obj_type = ((acpi_namespace_node *) object)->type;
- /*
- * Copy appropriate flags
- */
- if (((acpi_namespace_node *) object)->flags & ANOBJ_AML_ATTACHMENT) {
- flags |= ANOBJ_AML_ATTACHMENT;
- }
- }
- /*
- * Otherwise, we will use the parameter object, but we must type
- * it first
- */
- else {
- obj_desc = (acpi_operand_object *) object;
- /* If a valid type (non-ANY) was given, just use it */
- if (ACPI_TYPE_ANY != type) {
- obj_type = type;
- }
- else {
- /*
- * Cannot figure out the type -- set to Def_any which
- * will print as an error in the name table dump
- */
- if (acpi_dbg_level > 0) {
- DUMP_PATHNAME (node,
- "Ns_attach_object confused: setting bogus type for ",
- ACPI_LV_INFO, _COMPONENT);
- if (VALID_DESCRIPTOR_TYPE (object, ACPI_DESC_TYPE_NAMED)) {
- DUMP_PATHNAME (object, "name ", ACPI_LV_INFO, _COMPONENT);
- }
- else {
- DUMP_PATHNAME (object, "object ", ACPI_LV_INFO, _COMPONENT);
- DUMP_STACK_ENTRY (object);
- }
- }
- obj_type = INTERNAL_TYPE_DEF_ANY;
- }
- }
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Installing %p into Node %p [%4.4s]n",
- obj_desc, node, (char*)&node->name));
- /*
- * Must increment the new value's reference count
- * (if it is an internal object)
- */
- acpi_ut_add_reference (obj_desc);
- /* Save the existing object (if any) for deletion later */
- previous_obj_desc = node->object;
- /* Install the object and set the type, flags */
- node->object = obj_desc;
- node->type = (u8) obj_type;
- node->flags |= flags;
- /*
- * Delete an existing attached object.
- */
- if (previous_obj_desc) {
- /* One for the attach to the Node */
- acpi_ut_remove_reference (previous_obj_desc);
- /* Now delete */
- acpi_ut_remove_reference (previous_obj_desc);
- }
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_detach_object
- *
- * PARAMETERS: Node - An object whose Value will be deleted
- *
- * RETURN: None.
- *
- * DESCRIPTION: Delete the Value associated with a namespace object. If the
- * Value is an allocated object, it is freed. Otherwise, the
- * field is simply cleared.
- *
- ******************************************************************************/
- void
- acpi_ns_detach_object (
- acpi_namespace_node *node)
- {
- acpi_operand_object *obj_desc;
- FUNCTION_TRACE ("Ns_detach_object");
- obj_desc = node->object;
- if (!obj_desc) {
- return_VOID;
- }
- /* Clear the entry in all cases */
- node->object = NULL;
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Object=%p Value=%p Name %4.4sn",
- node, obj_desc, (char*)&node->name));
- /* Remove one reference on the object (and all subobjects) */
- acpi_ut_remove_reference (obj_desc);
- return_VOID;
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_get_attached_object
- *
- * PARAMETERS: Node - Parent Node to be examined
- *
- * RETURN: Current value of the object field from the Node whose
- * handle is passed
- *
- ******************************************************************************/
- void *
- acpi_ns_get_attached_object (
- acpi_namespace_node *node)
- {
- FUNCTION_TRACE_PTR ("Ns_get_attached_object", node);
- if (!node) {
- /* handle invalid */
- ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Null Node ptrn"));
- return_PTR (NULL);
- }
- return_PTR (node->object);
- }