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/******************************************************************************
*
* Module Name: nsload - namespace loading/expanding/contracting procedures
* $Revision: 47 $
*
*****************************************************************************/
/*
* 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 "acinterp.h"
#include "acnamesp.h"
#include "amlcode.h"
#include "acparser.h"
#include "acdispat.h"
#include "acdebug.h"
#define _COMPONENT ACPI_NAMESPACE
MODULE_NAME ("nsload")
/*******************************************************************************
*
* FUNCTION: Acpi_load_namespace
*
* PARAMETERS: Display_aml_during_load
*
* RETURN: Status
*
* DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
* (DSDT points to either the BIOS or a buffer.)
*
******************************************************************************/
acpi_status
acpi_ns_load_namespace (
void)
{
acpi_status status;
FUNCTION_TRACE ("Acpi_load_name_space");
/* There must be at least a DSDT installed */
if (acpi_gbl_DSDT == NULL) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "DSDT is not in memory\n"));
return_ACPI_STATUS (AE_NO_ACPI_TABLES);
}
/*
* Load the namespace. The DSDT is required,
* but the SSDT and PSDT tables are optional.
*/
status = acpi_ns_load_table_by_type (ACPI_TABLE_DSDT);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/* Ignore exceptions from these */
acpi_ns_load_table_by_type (ACPI_TABLE_SSDT);
acpi_ns_load_table_by_type (ACPI_TABLE_PSDT);
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
"ACPI Namespace successfully loaded at root %p\n",
acpi_gbl_root_node));
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_one_parse_pass
*
* PARAMETERS:
*
* RETURN: Status
*
* DESCRIPTION:
*
******************************************************************************/
acpi_status
acpi_ns_one_complete_parse (
u32 pass_number,
acpi_table_desc *table_desc)
{
acpi_parse_object *parse_root;
acpi_status status;
acpi_walk_state *walk_state;
FUNCTION_TRACE ("Ns_one_complete_parse");
/* Create and init a Root Node */
parse_root = acpi_ps_alloc_op (AML_SCOPE_OP);
if (!parse_root) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
((acpi_parse2_object *) parse_root)->name = ACPI_ROOT_NAME;
/* Create and initialize a new walk state */
walk_state = acpi_ds_create_walk_state (TABLE_ID_DSDT,
NULL, NULL, NULL);
if (!walk_state) {
acpi_ps_free_op (parse_root);
return_ACPI_STATUS (AE_NO_MEMORY);
}
status = acpi_ds_init_aml_walk (walk_state, parse_root, NULL, table_desc->aml_start,
table_desc->aml_length, NULL, NULL, pass_number);
if (ACPI_FAILURE (status)) {
acpi_ds_delete_walk_state (walk_state);
return_ACPI_STATUS (status);
}
/* Parse the AML */
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "*PARSE* pass %d parse\n", pass_number));
status = acpi_ps_parse_aml (walk_state);
acpi_ps_delete_parse_tree (parse_root);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_parse_table
*
* PARAMETERS: Table_desc - An ACPI table descriptor for table to parse
* Start_node - Where to enter the table into the namespace
*
* RETURN: Status
*
* DESCRIPTION: Parse AML within an ACPI table and return a tree of ops
*
******************************************************************************/
acpi_status
acpi_ns_parse_table (
acpi_table_desc *table_desc,
acpi_namespace_node *start_node)
{
acpi_status status;
FUNCTION_TRACE ("Ns_parse_table");
/*
* AML Parse, pass 1
*
* In this pass, we load most of the namespace. Control methods
* are not parsed until later. A parse tree is not created. Instead,
* each Parser Op subtree is deleted when it is finished. This saves
* a great deal of memory, and allows a small cache of parse objects
* to service the entire parse. The second pass of the parse then
* performs another complete parse of the AML..
*/
status = acpi_ns_one_complete_parse (1, table_desc);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/*
* AML Parse, pass 2
*
* In this pass, we resolve forward references and other things
* that could not be completed during the first pass.
* Another complete parse of the AML is performed, but the
* overhead of this is compensated for by the fact that the
* parse objects are all cached.
*/
status = acpi_ns_one_complete_parse (2, table_desc);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_load_table
*
* PARAMETERS: Table_desc - Descriptor for table to be loaded
* Node - Owning NS node
*
* RETURN: Status
*
* DESCRIPTION: Load one ACPI table into the namespace
*
******************************************************************************/
acpi_status
acpi_ns_load_table (
acpi_table_desc *table_desc,
acpi_namespace_node *node)
{
acpi_status status;
FUNCTION_TRACE ("Ns_load_table");
if (!table_desc->aml_start) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null AML pointer\n"));
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "AML block at %p\n", table_desc->aml_start));
if (!table_desc->aml_length) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Zero-length AML block\n"));
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/*
* Parse the table and load the namespace with all named
* objects found within. Control methods are NOT parsed
* at this time. In fact, the control methods cannot be
* parsed until the entire namespace is loaded, because
* if a control method makes a forward reference (call)
* to another control method, we can't continue parsing
* because we don't know how many arguments to parse next!
*/
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "**** Loading table into namespace ****\n"));
acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
status = acpi_ns_parse_table (table_desc, node->child);
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/*
* Now we can parse the control methods. We always parse
* them here for a sanity check, and if configured for
* just-in-time parsing, we delete the control method
* parse trees.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"**** Begin Table Method Parsing and Object Initialization ****\n"));
status = acpi_ds_initialize_objects (table_desc, node);
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"**** Completed Table Method Parsing and Object Initialization ****\n"));
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_load_table_by_type
*
* PARAMETERS: Table_type - Id of the table type to load
*
* RETURN: Status
*
* DESCRIPTION: Load an ACPI table or tables into the namespace. All tables
* of the given type are loaded. The mechanism allows this
* routine to be called repeatedly.
*
******************************************************************************/
acpi_status
acpi_ns_load_table_by_type (
acpi_table_type table_type)
{
u32 i;
acpi_status status = AE_OK;
acpi_table_desc *table_desc;
FUNCTION_TRACE ("Ns_load_table_by_type");
acpi_ut_acquire_mutex (ACPI_MTX_TABLES);
/*
* Table types supported are:
* DSDT (one), SSDT/PSDT (multiple)
*/
switch (table_type) {
case ACPI_TABLE_DSDT:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Loading DSDT\n"));
table_desc = &acpi_gbl_acpi_tables[ACPI_TABLE_DSDT];
/* If table already loaded into namespace, just return */
if (table_desc->loaded_into_namespace) {
goto unlock_and_exit;
}
table_desc->table_id = TABLE_ID_DSDT;
/* Now load the single DSDT */
status = acpi_ns_load_table (table_desc, acpi_gbl_root_node);
if (ACPI_SUCCESS (status)) {
table_desc->loaded_into_namespace = TRUE;
}
break;
case ACPI_TABLE_SSDT:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Loading %d SSDTs\n",
acpi_gbl_acpi_tables[ACPI_TABLE_SSDT].count));
/*
* Traverse list of SSDT tables
*/
table_desc = &acpi_gbl_acpi_tables[ACPI_TABLE_SSDT];
for (i = 0; i < acpi_gbl_acpi_tables[ACPI_TABLE_SSDT].count; i++) {
/*
* Only attempt to load table if it is not
* already loaded!
*/
if (!table_desc->loaded_into_namespace) {
status = acpi_ns_load_table (table_desc, acpi_gbl_root_node);
if (ACPI_FAILURE (status)) {
break;
}
table_desc->loaded_into_namespace = TRUE;
}
table_desc = table_desc->next;
}
break;
case ACPI_TABLE_PSDT:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Loading %d PSDTs\n",
acpi_gbl_acpi_tables[ACPI_TABLE_PSDT].count));
/*
* Traverse list of PSDT tables
*/
table_desc = &acpi_gbl_acpi_tables[ACPI_TABLE_PSDT];
for (i = 0; i < acpi_gbl_acpi_tables[ACPI_TABLE_PSDT].count; i++) {
/* Only attempt to load table if it is not already loaded! */
if (!table_desc->loaded_into_namespace) {
status = acpi_ns_load_table (table_desc, acpi_gbl_root_node);
if (ACPI_FAILURE (status)) {
break;
}
table_desc->loaded_into_namespace = TRUE;
}
table_desc = table_desc->next;
}
break;
default:
status = AE_SUPPORT;
break;
}
unlock_and_exit:
acpi_ut_release_mutex (ACPI_MTX_TABLES);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_delete_subtree
*
* PARAMETERS: Start_handle - Handle in namespace where search begins
*
* RETURNS Status
*
* DESCRIPTION: Walks the namespace starting at the given handle and deletes
* all objects, entries, and scopes in the entire subtree.
*
* TBD: [Investigate] What if any part of this subtree is in use?
* (i.e. on one of the object stacks?)
*
******************************************************************************/
acpi_status
acpi_ns_delete_subtree (
acpi_handle start_handle)
{
acpi_status status;
acpi_handle child_handle;
acpi_handle parent_handle;
acpi_handle next_child_handle;
acpi_handle dummy;
u32 level;
FUNCTION_TRACE ("Ns_delete_subtree");
parent_handle = start_handle;
child_handle = 0;
level = 1;
/*
* Traverse the tree of objects until we bubble back up
* to where we started.
*/
while (level > 0) {
/* Attempt to get the next object in this scope */
status = acpi_get_next_object (ACPI_TYPE_ANY, parent_handle,
child_handle, &next_child_handle);
child_handle = next_child_handle;
/* Did we get a new object? */
if (ACPI_SUCCESS (status)) {
/* Check if this object has any children */
if (ACPI_SUCCESS (acpi_get_next_object (ACPI_TYPE_ANY, child_handle,
0, &dummy))) {
/*
* There is at least one child of this object,
* visit the object
*/
level++;
parent_handle = child_handle;
child_handle = 0;
}
}
else {
/*
* No more children in this object, go back up to
* the object's parent
*/
level--;
/* Delete all children now */
acpi_ns_delete_children (child_handle);
child_handle = parent_handle;
acpi_get_parent (parent_handle, &parent_handle);
}
}
/* Now delete the starting object, and we are done */
acpi_ns_delete_node (child_handle);
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_unload_name_space
*
* PARAMETERS: Handle - Root of namespace subtree to be deleted
*
* RETURN: Status
*
* DESCRIPTION: Shrinks the namespace, typically in response to an undocking
* event. Deletes an entire subtree starting from (and
* including) the given handle.
*
******************************************************************************/
acpi_status
acpi_ns_unload_namespace (
acpi_handle handle)
{
acpi_status status;
FUNCTION_TRACE ("Ns_unload_name_space");
/* Parameter validation */
if (!acpi_gbl_root_node) {
return_ACPI_STATUS (AE_NO_NAMESPACE);
}
if (!handle) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* This function does the real work */
status = acpi_ns_delete_subtree (handle);
return_ACPI_STATUS (status);
}
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