diff options
Diffstat (limited to 'drivers/acpi/namespace/nsload.c')
| -rw-r--r-- | drivers/acpi/namespace/nsload.c | 460 |
1 files changed, 460 insertions, 0 deletions
diff --git a/drivers/acpi/namespace/nsload.c b/drivers/acpi/namespace/nsload.c new file mode 100644 index 00000000000..1d7aedf68a7 --- /dev/null +++ b/drivers/acpi/namespace/nsload.c @@ -0,0 +1,460 @@ +/****************************************************************************** + * + * Module Name: nsload - namespace loading/expanding/contracting procedures + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, R. Byron Moore + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + */ + + +#include <acpi/acpi.h> +#include <acpi/acnamesp.h> +#include <acpi/acdispat.h> + + +#define _COMPONENT ACPI_NAMESPACE + ACPI_MODULE_NAME ("nsload") + + +#ifndef ACPI_NO_METHOD_EXECUTION + +/******************************************************************************* + * + * 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 ( + struct acpi_table_desc *table_desc, + struct acpi_namespace_node *node) +{ + acpi_status status; + + + ACPI_FUNCTION_TRACE ("ns_load_table"); + + + /* Check if table contains valid AML (must be DSDT, PSDT, SSDT, etc.) */ + + if (!(acpi_gbl_table_data[table_desc->type].flags & ACPI_TABLE_EXECUTABLE)) { + /* Just ignore this table */ + + return_ACPI_STATUS (AE_OK); + } + + /* Check validity of the AML start and length */ + + 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)); + + /* Ignore table if there is no AML contained within */ + + if (!table_desc->aml_length) { + ACPI_REPORT_WARNING (("Zero-length AML block in table [%4.4s]\n", + table_desc->pointer->signature)); + return_ACPI_STATUS (AE_OK); + } + + /* + * 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")); + + status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + status = acpi_ns_parse_table (table_desc, node->child); + (void) 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; + struct acpi_table_desc *table_desc; + + + ACPI_FUNCTION_TRACE ("ns_load_table_by_type"); + + + status = acpi_ut_acquire_mutex (ACPI_MTX_TABLES); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + /* + * 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_table_lists[ACPI_TABLE_DSDT].next; + + /* If table already loaded into namespace, just return */ + + if (table_desc->loaded_into_namespace) { + goto unlock_and_exit; + } + + /* 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_table_lists[ACPI_TABLE_SSDT].count)); + + /* + * Traverse list of SSDT tables + */ + table_desc = acpi_gbl_table_lists[ACPI_TABLE_SSDT].next; + for (i = 0; i < acpi_gbl_table_lists[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_table_lists[ACPI_TABLE_PSDT].count)); + + /* + * Traverse list of PSDT tables + */ + table_desc = acpi_gbl_table_lists[ACPI_TABLE_PSDT].next; + + for (i = 0; i < acpi_gbl_table_lists[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: + (void) acpi_ut_release_mutex (ACPI_MTX_TABLES); + return_ACPI_STATUS (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_load_namespace + * + * PARAMETERS: None + * + * 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; + + + ACPI_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 */ + + (void) acpi_ns_load_table_by_type (ACPI_TABLE_SSDT); + (void) acpi_ns_load_table_by_type (ACPI_TABLE_PSDT); + + ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT, + "ACPI Namespace successfully loaded at root %p\n", + acpi_gbl_root_node)); + + return_ACPI_STATUS (status); +} + + +#ifdef ACPI_FUTURE_USAGE + +/******************************************************************************* + * + * 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. + * + * Namespace/Interpreter should be locked or the subsystem should + * be in shutdown before this routine is called. + * + ******************************************************************************/ + +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; + + + ACPI_FUNCTION_TRACE ("ns_delete_subtree"); + + + parent_handle = start_handle; + child_handle = NULL; + 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, + NULL, &dummy))) { + /* + * There is at least one child of this object, + * visit the object + */ + level++; + parent_handle = child_handle; + child_handle = NULL; + } + } + 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; + status = acpi_get_parent (parent_handle, &parent_handle); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + } + } + + /* 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; + + + ACPI_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); +} + +#endif /* ACPI_FUTURE_USAGE */ + +#endif + |