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/*******************************************************************************
*
* Module Name: nsalloc - Namespace allocation and deletion utilities
* $Revision: 60 $
*
******************************************************************************/
/*
* 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 "acnamesp.h"
#include "acinterp.h"
#define _COMPONENT ACPI_NAMESPACE
MODULE_NAME ("nsalloc")
/*******************************************************************************
*
* FUNCTION: Acpi_ns_create_node
*
* PARAMETERS: Acpi_name - Name of the new node
*
* RETURN: None
*
* DESCRIPTION: Create a namespace node
*
******************************************************************************/
acpi_namespace_node *
acpi_ns_create_node (
u32 name)
{
acpi_namespace_node *node;
FUNCTION_TRACE ("Ns_create_node");
node = ACPI_MEM_CALLOCATE (sizeof (acpi_namespace_node));
if (!node) {
return_PTR (NULL);
}
ACPI_MEM_TRACKING (acpi_gbl_memory_lists[ACPI_MEM_LIST_NSNODE].total_allocated++);
node->data_type = ACPI_DESC_TYPE_NAMED;
node->name = name;
node->reference_count = 1;
return_PTR (node);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_delete_node
*
* PARAMETERS: Node - Node to be deleted
*
* RETURN: None
*
* DESCRIPTION: Delete a namespace node
*
******************************************************************************/
void
acpi_ns_delete_node (
acpi_namespace_node *node)
{
acpi_namespace_node *parent_node;
acpi_namespace_node *prev_node;
acpi_namespace_node *next_node;
FUNCTION_TRACE_PTR ("Ns_delete_node", node);
parent_node = acpi_ns_get_parent_object (node);
prev_node = NULL;
next_node = parent_node->child;
while (next_node != node) {
prev_node = next_node;
next_node = prev_node->peer;
}
if (prev_node) {
prev_node->peer = next_node->peer;
if (next_node->flags & ANOBJ_END_OF_PEER_LIST) {
prev_node->flags |= ANOBJ_END_OF_PEER_LIST;
}
}
else {
parent_node->child = next_node->peer;
}
ACPI_MEM_TRACKING (acpi_gbl_memory_lists[ACPI_MEM_LIST_NSNODE].total_freed++);
/*
* Detach an object if there is one
*/
if (node->object) {
acpi_ns_detach_object (node);
}
ACPI_MEM_FREE (node);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_install_node
*
* PARAMETERS: Walk_state - Current state of the walk
* Parent_node - The parent of the new Node
* Node - The new Node to install
* Type - ACPI object type of the new Node
*
* RETURN: None
*
* DESCRIPTION: Initialize a new entry within a namespace table.
*
******************************************************************************/
void
acpi_ns_install_node (
acpi_walk_state *walk_state,
acpi_namespace_node *parent_node, /* Parent */
acpi_namespace_node *node, /* New Child*/
acpi_object_type8 type)
{
u16 owner_id = TABLE_ID_DSDT;
acpi_namespace_node *child_node;
FUNCTION_TRACE ("Ns_install_node");
/*
* Get the owner ID from the Walk state
* The owner ID is used to track table deletion and
* deletion of objects created by methods
*/
if (walk_state) {
owner_id = walk_state->owner_id;
}
/* link the new entry into the parent and existing children */
/* TBD: Could be first, last, or alphabetic */
child_node = parent_node->child;
if (!child_node) {
parent_node->child = node;
}
else {
while (!(child_node->flags & ANOBJ_END_OF_PEER_LIST)) {
child_node = child_node->peer;
}
child_node->peer = node;
/* Clear end-of-list flag */
child_node->flags &= ~ANOBJ_END_OF_PEER_LIST;
}
/* Init the new entry */
node->owner_id = owner_id;
node->flags |= ANOBJ_END_OF_PEER_LIST;
node->peer = parent_node;
/*
* If adding a name with unknown type, or having to
* add the region in order to define fields in it, we
* have a forward reference.
*/
if ((ACPI_TYPE_ANY == type) ||
(INTERNAL_TYPE_FIELD_DEFN == type) ||
(INTERNAL_TYPE_BANK_FIELD_DEFN == type)) {
/*
* We don't want to abort here, however!
* We will fill in the actual type when the
* real definition is found later.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "[%4.4s] is a forward reference\n",
(char*)&node->name));
}
/*
* The Def_field_defn and Bank_field_defn cases are actually
* looking up the Region in which the field will be defined
*/
if ((INTERNAL_TYPE_FIELD_DEFN == type) ||
(INTERNAL_TYPE_BANK_FIELD_DEFN == type)) {
type = ACPI_TYPE_REGION;
}
/*
* Scope, Def_any, and Index_field_defn are bogus "types" which do
* not actually have anything to do with the type of the name
* being looked up. Save any other value of Type as the type of
* the entry.
*/
if ((type != INTERNAL_TYPE_SCOPE) &&
(type != INTERNAL_TYPE_DEF_ANY) &&
(type != INTERNAL_TYPE_INDEX_FIELD_DEFN)) {
node->type = (u8) type;
}
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%4.4s added to %p at %p\n",
(char*)&node->name, parent_node, node));
/*
* Increment the reference count(s) of all parents up to
* the root!
*/
while ((node = acpi_ns_get_parent_object (node)) != NULL) {
node->reference_count++;
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_delete_children
*
* PARAMETERS: Parent_node - Delete this objects children
*
* RETURN: None.
*
* DESCRIPTION: Delete all children of the parent object. Deletes a
* "scope".
*
******************************************************************************/
void
acpi_ns_delete_children (
acpi_namespace_node *parent_node)
{
acpi_namespace_node *child_node;
acpi_namespace_node *next_node;
u8 flags;
FUNCTION_TRACE_PTR ("Ns_delete_children", parent_node);
if (!parent_node) {
return_VOID;
}
/* If no children, all done! */
child_node = parent_node->child;
if (!child_node) {
return_VOID;
}
/*
* Deallocate all children at this level
*/
do {
/* Get the things we need */
next_node = child_node->peer;
flags = child_node->flags;
/* Grandchildren should have all been deleted already */
if (child_node->child) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Found a grandchild! P=%p C=%p\n",
parent_node, child_node));
}
/* Now we can free this child object */
ACPI_MEM_TRACKING (acpi_gbl_memory_lists[ACPI_MEM_LIST_NSNODE].total_freed++);
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Object %p, Remaining %X\n",
child_node, acpi_gbl_current_node_count));
/*
* Detach an object if there is one, then free the child node
*/
acpi_ns_detach_object (child_node);
ACPI_MEM_FREE (child_node);
/* And move on to the next child in the list */
child_node = next_node;
} while (!(flags & ANOBJ_END_OF_PEER_LIST));
/* Clear the parent's child pointer */
parent_node->child = NULL;
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_delete_namespace_subtree
*
* PARAMETERS: Parent_node - Root of the subtree to be deleted
*
* RETURN: None.
*
* DESCRIPTION: Delete a subtree of the namespace. This includes all objects
* stored within the subtree. Scope tables are deleted also
*
******************************************************************************/
acpi_status
acpi_ns_delete_namespace_subtree (
acpi_namespace_node *parent_node)
{
acpi_namespace_node *child_node = NULL;
u32 level = 1;
FUNCTION_TRACE ("Ns_delete_namespace_subtree");
if (!parent_node) {
return_ACPI_STATUS (AE_OK);
}
/*
* Traverse the tree of objects until we bubble back up
* to where we started.
*/
while (level > 0) {
/* Get the next node in this scope (NULL if none) */
child_node = acpi_ns_get_next_node (ACPI_TYPE_ANY, parent_node,
child_node);
if (child_node) {
/* Found a child node - detach any attached object */
acpi_ns_detach_object (child_node);
/* Check if this node has any children */
if (acpi_ns_get_next_node (ACPI_TYPE_ANY, child_node, 0)) {
/*
* There is at least one child of this node,
* visit the node
*/
level++;
parent_node = child_node;
child_node = 0;
}
}
else {
/*
* No more children of this parent node.
* Move up to the grandparent.
*/
level--;
/*
* Now delete all of the children of this parent
* all at the same time.
*/
acpi_ns_delete_children (parent_node);
/* New "last child" is this parent node */
child_node = parent_node;
/* Move up the tree to the grandparent */
parent_node = acpi_ns_get_parent_object (parent_node);
}
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_remove_reference
*
* PARAMETERS: Node - Named node whose reference count is to be
* decremented
*
* RETURN: None.
*
* DESCRIPTION: Remove a Node reference. Decrements the reference count
* of all parent Nodes up to the root. Any node along
* the way that reaches zero references is freed.
*
******************************************************************************/
static void
acpi_ns_remove_reference (
acpi_namespace_node *node)
{
acpi_namespace_node *next_node;
FUNCTION_ENTRY ();
/*
* Decrement the reference count(s) of this node and all
* nodes up to the root, Delete anything with zero remaining references.
*/
next_node = node;
while (next_node) {
/* Decrement the reference count on this node*/
next_node->reference_count--;
/* Delete the node if no more references */
if (!next_node->reference_count) {
/* Delete all children and delete the node */
acpi_ns_delete_children (next_node);
acpi_ns_delete_node (next_node);
}
/* Move up to parent */
next_node = acpi_ns_get_parent_object (next_node);
}
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_delete_namespace_by_owner
*
* PARAMETERS: Owner_id - All nodes with this owner will be deleted
*
* RETURN: Status
*
* DESCRIPTION: Delete entries within the namespace that are owned by a
* specific ID. Used to delete entire ACPI tables. All
* reference counts are updated.
*
******************************************************************************/
acpi_status
acpi_ns_delete_namespace_by_owner (
u16 owner_id)
{
acpi_namespace_node *child_node;
u32 level;
acpi_namespace_node *parent_node;
FUNCTION_TRACE ("Ns_delete_namespace_by_owner");
parent_node = acpi_gbl_root_node;
child_node = 0;
level = 1;
/*
* Traverse the tree of nodes until we bubble back up
* to where we started.
*/
while (level > 0) {
/* Get the next node in this scope (NULL if none) */
child_node = acpi_ns_get_next_node (ACPI_TYPE_ANY, parent_node,
child_node);
if (child_node) {
if (child_node->owner_id == owner_id) {
/* Found a child node - detach any attached object */
acpi_ns_detach_object (child_node);
}
/* Check if this node has any children */
if (acpi_ns_get_next_node (ACPI_TYPE_ANY, child_node, 0)) {
/*
* There is at least one child of this node,
* visit the node
*/
level++;
parent_node = child_node;
child_node = 0;
}
else if (child_node->owner_id == owner_id) {
acpi_ns_remove_reference (child_node);
}
}
else {
/*
* No more children of this parent node.
* Move up to the grandparent.
*/
level--;
if (level != 0) {
if (parent_node->owner_id == owner_id) {
acpi_ns_remove_reference (parent_node);
}
}
/* New "last child" is this parent node */
child_node = parent_node;
/* Move up the tree to the grandparent */
parent_node = acpi_ns_get_parent_object (parent_node);
}
}
return_ACPI_STATUS (AE_OK);
}
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