415 lines
11 KiB
C
415 lines
11 KiB
C
/******************************************************************************
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*
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* Module Name: nsload - namespace loading/expanding/contracting procedures
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2006, 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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#include <acpi/acdispat.h>
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nsload")
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/* Local prototypes */
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static acpi_status acpi_ns_load_table_by_type(acpi_table_type table_type);
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#ifdef ACPI_FUTURE_IMPLEMENTATION
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acpi_status acpi_ns_unload_namespace(acpi_handle handle);
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static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle);
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#endif
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#ifndef ACPI_NO_METHOD_EXECUTION
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_load_table
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*
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* PARAMETERS: table_desc - Descriptor for table to be loaded
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* Node - Owning NS node
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*
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* RETURN: Status
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*
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* DESCRIPTION: Load one ACPI table into the namespace
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*
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******************************************************************************/
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acpi_status
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acpi_ns_load_table(struct acpi_table_desc *table_desc,
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struct acpi_namespace_node *node)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE("ns_load_table");
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/* Check if table contains valid AML (must be DSDT, PSDT, SSDT, etc.) */
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if (!
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(acpi_gbl_table_data[table_desc->type].
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flags & ACPI_TABLE_EXECUTABLE)) {
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/* Just ignore this table */
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return_ACPI_STATUS(AE_OK);
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}
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/* Check validity of the AML start and length */
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if (!table_desc->aml_start) {
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ACPI_ERROR((AE_INFO, "Null AML pointer"));
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AML block at %p\n",
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table_desc->aml_start));
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/* Ignore table if there is no AML contained within */
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if (!table_desc->aml_length) {
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ACPI_WARNING((AE_INFO, "Zero-length AML block in table [%4.4s]",
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table_desc->pointer->signature));
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return_ACPI_STATUS(AE_OK);
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}
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/*
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* Parse the table and load the namespace with all named
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* objects found within. Control methods are NOT parsed
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* at this time. In fact, the control methods cannot be
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* parsed until the entire namespace is loaded, because
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* if a control method makes a forward reference (call)
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* to another control method, we can't continue parsing
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* because we don't know how many arguments to parse next!
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"**** Loading table into namespace ****\n"));
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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status = acpi_ns_parse_table(table_desc, node->child);
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/*
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* Now we can parse the control methods. We always parse
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* them here for a sanity check, and if configured for
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* just-in-time parsing, we delete the control method
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* parse trees.
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"**** Begin Table Method Parsing and Object Initialization ****\n"));
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status = acpi_ds_initialize_objects(table_desc, node);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"**** Completed Table Method Parsing and Object Initialization ****\n"));
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_load_table_by_type
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*
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* PARAMETERS: table_type - Id of the table type to load
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*
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* RETURN: Status
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*
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* DESCRIPTION: Load an ACPI table or tables into the namespace. All tables
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* of the given type are loaded. The mechanism allows this
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* routine to be called repeatedly.
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*
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******************************************************************************/
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static acpi_status acpi_ns_load_table_by_type(acpi_table_type table_type)
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{
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u32 i;
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acpi_status status;
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struct acpi_table_desc *table_desc;
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ACPI_FUNCTION_TRACE("ns_load_table_by_type");
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status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/*
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* Table types supported are:
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* DSDT (one), SSDT/PSDT (multiple)
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*/
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switch (table_type) {
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case ACPI_TABLE_DSDT:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace load: DSDT\n"));
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table_desc = acpi_gbl_table_lists[ACPI_TABLE_DSDT].next;
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/* If table already loaded into namespace, just return */
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if (table_desc->loaded_into_namespace) {
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goto unlock_and_exit;
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}
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/* Now load the single DSDT */
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status = acpi_ns_load_table(table_desc, acpi_gbl_root_node);
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if (ACPI_SUCCESS(status)) {
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table_desc->loaded_into_namespace = TRUE;
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}
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break;
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case ACPI_TABLE_SSDT:
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case ACPI_TABLE_PSDT:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Namespace load: %d SSDT or PSDTs\n",
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acpi_gbl_table_lists[table_type].count));
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/*
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* Traverse list of SSDT or PSDT tables
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*/
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table_desc = acpi_gbl_table_lists[table_type].next;
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for (i = 0; i < acpi_gbl_table_lists[table_type].count; i++) {
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/*
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* Only attempt to load table into namespace if it is not
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* already loaded!
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*/
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if (!table_desc->loaded_into_namespace) {
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status =
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acpi_ns_load_table(table_desc,
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acpi_gbl_root_node);
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if (ACPI_FAILURE(status)) {
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break;
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}
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table_desc->loaded_into_namespace = TRUE;
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}
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table_desc = table_desc->next;
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}
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break;
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default:
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status = AE_SUPPORT;
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break;
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}
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unlock_and_exit:
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(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_load_namespace
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
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* (DSDT points to either the BIOS or a buffer.)
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*
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******************************************************************************/
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acpi_status acpi_ns_load_namespace(void)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE("acpi_load_name_space");
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/* There must be at least a DSDT installed */
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if (acpi_gbl_DSDT == NULL) {
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ACPI_ERROR((AE_INFO, "DSDT is not in memory"));
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return_ACPI_STATUS(AE_NO_ACPI_TABLES);
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}
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/*
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* Load the namespace. The DSDT is required,
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* but the SSDT and PSDT tables are optional.
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*/
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status = acpi_ns_load_table_by_type(ACPI_TABLE_DSDT);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Ignore exceptions from these */
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(void)acpi_ns_load_table_by_type(ACPI_TABLE_SSDT);
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(void)acpi_ns_load_table_by_type(ACPI_TABLE_PSDT);
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
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"ACPI Namespace successfully loaded at root %p\n",
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acpi_gbl_root_node));
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return_ACPI_STATUS(status);
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}
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#ifdef ACPI_FUTURE_IMPLEMENTATION
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_delete_subtree
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*
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* PARAMETERS: start_handle - Handle in namespace where search begins
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*
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* RETURNS Status
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*
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* DESCRIPTION: Walks the namespace starting at the given handle and deletes
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* all objects, entries, and scopes in the entire subtree.
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*
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* Namespace/Interpreter should be locked or the subsystem should
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* be in shutdown before this routine is called.
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*
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******************************************************************************/
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static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle)
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{
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acpi_status status;
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acpi_handle child_handle;
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acpi_handle parent_handle;
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acpi_handle next_child_handle;
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acpi_handle dummy;
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u32 level;
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ACPI_FUNCTION_TRACE("ns_delete_subtree");
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parent_handle = start_handle;
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child_handle = NULL;
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level = 1;
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/*
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* Traverse the tree of objects until we bubble back up
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* to where we started.
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*/
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while (level > 0) {
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/* Attempt to get the next object in this scope */
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status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle,
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child_handle, &next_child_handle);
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child_handle = next_child_handle;
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/* Did we get a new object? */
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if (ACPI_SUCCESS(status)) {
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/* Check if this object has any children */
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if (ACPI_SUCCESS
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(acpi_get_next_object
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(ACPI_TYPE_ANY, child_handle, NULL, &dummy))) {
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/*
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* There is at least one child of this object,
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* visit the object
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*/
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level++;
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parent_handle = child_handle;
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child_handle = NULL;
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}
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} else {
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/*
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* No more children in this object, go back up to
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* the object's parent
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*/
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level--;
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/* Delete all children now */
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acpi_ns_delete_children(child_handle);
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child_handle = parent_handle;
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status = acpi_get_parent(parent_handle, &parent_handle);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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}
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/* Now delete the starting object, and we are done */
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acpi_ns_delete_node(child_handle);
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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_unload_name_space
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*
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* PARAMETERS: Handle - Root of namespace subtree to be deleted
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*
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* RETURN: Status
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*
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* DESCRIPTION: Shrinks the namespace, typically in response to an undocking
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* event. Deletes an entire subtree starting from (and
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* including) the given handle.
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*
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******************************************************************************/
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acpi_status acpi_ns_unload_namespace(acpi_handle handle)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE("ns_unload_name_space");
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/* Parameter validation */
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if (!acpi_gbl_root_node) {
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return_ACPI_STATUS(AE_NO_NAMESPACE);
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}
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if (!handle) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* This function does the real work */
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status = acpi_ns_delete_subtree(handle);
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return_ACPI_STATUS(status);
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}
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#endif
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#endif
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