/*******************************************************************************
*
* Module Name: nseval - Object evaluation interfaces -- includes control
* method lookup and execution.
*
******************************************************************************/
/*
* 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/acparser.h>
#include <acpi/acinterp.h>
#include <acpi/acnamesp.h>
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME ("nseval")
/* Local prototypes */
static acpi_status
acpi_ns_execute_control_method (
struct acpi_parameter_info *info);
static acpi_status
acpi_ns_get_object_value (
struct acpi_parameter_info *info);
/*******************************************************************************
*
* FUNCTION: acpi_ns_evaluate_relative
*
* PARAMETERS: Pathname - Name of method to execute, If NULL, the
* handle is the object to execute
* Info - Method info block, contains:
* return_object - Where to put method's return value (if
* any). If NULL, no value is returned.
* Params - List of parameters to pass to the method,
* terminated by NULL. Params itself may be
* NULL if no parameters are being passed.
*
* RETURN: Status
*
* DESCRIPTION: Evaluate the object or find and execute the requested method
*
* MUTEX: Locks Namespace
*
******************************************************************************/
acpi_status
acpi_ns_evaluate_relative (
char *pathname,
struct acpi_parameter_info *info)
{
acpi_status status;
struct acpi_namespace_node *node = NULL;
union acpi_generic_state *scope_info;
char *internal_path = NULL;
ACPI_FUNCTION_TRACE ("ns_evaluate_relative");
/*
* Must have a valid object handle
*/
if (!info || !info->node) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Build an internal name string for the method */
status = acpi_ns_internalize_name (pathname, &internal_path);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
scope_info = acpi_ut_create_generic_state ();
if (!scope_info) {
goto cleanup1;
}
/* Get the prefix handle and Node */
status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
goto cleanup;
}
info->node = acpi_ns_map_handle_to_node (info->node);
if (!info->node) {
(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
status = AE_BAD_PARAMETER;
goto cleanup;
}
/* Lookup the name in the namespace */
scope_info->scope.node = info->node;
status = acpi_ns_lookup (scope_info, internal_path, ACPI_TYPE_ANY,
ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
&node);
(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Object [%s] not found [%s]\n",
pathname, acpi_format_exception (status)));
goto cleanup;
}
/*
* Now that we have a handle to the object, we can attempt to evaluate it.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
pathname, node, acpi_ns_get_attached_object (node)));
info->node = node;
status = acpi_ns_evaluate_by_handle (info);
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n",
pathname));
cleanup:
acpi_ut_delete_generic_state (scope_info);
cleanup1:
ACPI_MEM_FREE (internal_path);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_evaluate_by_name
*
* PARAMETERS: Pathname - Fully qualified pathname to the object
* Info - Method info block, contains:
* return_object - Where to put method's return value (if
* any). If NULL, no value is returned.
* Params - List of parameters to pass to the method,
* terminated by NULL. Params itself may be
* NULL if no parameters are being passed.
*
* RETURN: Status
*
* DESCRIPTION: Evaluate the object or rind and execute the requested method
* passing the given parameters
*
* MUTEX: Locks Namespace
*
******************************************************************************/
acpi_status
acpi_ns_evaluate_by_name (
char *pathname,
struct acpi_parameter_info *info)
{
acpi_status status;
char *internal_path = NULL;
ACPI_FUNCTION_TRACE ("ns_evaluate_by_name");
/* Build an internal name string for the method */
status = acpi_ns_internalize_name (pathname, &internal_path);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
goto cleanup;
}
/* Lookup the name in the namespace */
status = acpi_ns_lookup (NULL, internal_path, ACPI_TYPE_ANY,
ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
&info->node);
(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
"Object at [%s] was not found, status=%.4X\n",
pathname, status));
goto cleanup;
}
/*
* Now that we have a handle to the object, we can attempt to evaluate it.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
pathname, info->node, acpi_ns_get_attached_object (info->node)));
status = acpi_ns_evaluate_by_handle (info);
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n",
pathname));
cleanup:
/* Cleanup */
if (internal_path) {
ACPI_MEM_FREE (internal_path);
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_evaluate_by_handle
*
* PARAMETERS: Info - Method info block, contains:
* Node - Method/Object Node to execute
* Parameters - List of parameters to pass to the method,
* terminated by NULL. Params itself may be
* NULL if no parameters are being passed.
* return_object - Where to put method's return value (if
* any). If NULL, no value is returned.
* parameter_type - Type of Parameter list
* return_object - Where to put method's return value (if
* any). If NULL, no value is returned.
*
* RETURN: Status
*
* DESCRIPTION: Evaluate object or execute the requested method passing the
* given parameters
*
* MUTEX: Locks Namespace
*
******************************************************************************/
acpi_status
acpi_ns_evaluate_by_handle (
struct acpi_parameter_info *info)
{
acpi_status status;
ACPI_FUNCTION_TRACE ("ns_evaluate_by_handle");
/* Check if namespace has been initialized */
if (!acpi_gbl_root_node) {
return_ACPI_STATUS (AE_NO_NAMESPACE);
}
/* Parameter Validation */
if (!info) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Initialize the return value to an invalid object */
info->return_object = NULL;
/* Get the prefix handle and Node */
status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
info->node = acpi_ns_map_handle_to_node (info->node);
if (!info->node) {
(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/*
* For a method alias, we must grab the actual method node so that proper
* scoping context will be established before execution.
*/
if (acpi_ns_get_type (info->node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) {
info->node = ACPI_CAST_PTR (struct acpi_namespace_node, info->node->object);
}
/*
* Two major cases here:
* 1) The object is an actual control method -- execute it.
* 2) The object is not a method -- just return it's current value
*
* In both cases, the namespace is unlocked by the acpi_ns* procedure
*/
if (acpi_ns_get_type (info->node) == ACPI_TYPE_METHOD) {
/*
* Case 1) We have an actual control method to execute
*/
status = acpi_ns_execute_control_method (info);
}
else {
/*
* Case 2) Object is NOT a method, just return its current value
*/
status = acpi_ns_get_object_value (info);
}
/*
* Check if there is a return value on the stack that must be dealt with
*/
if (status == AE_CTRL_RETURN_VALUE) {
/* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
status = AE_OK;
}
/*
* Namespace was unlocked by the handling acpi_ns* function, so we
* just return
*/
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_execute_control_method
*
* PARAMETERS: Info - Method info block, contains:
* Node - Method Node to execute
* Parameters - List of parameters to pass to the method,
* terminated by NULL. Params itself may be
* NULL if no parameters are being passed.
* return_object - Where to put method's return value (if
* any). If NULL, no value is returned.
* parameter_type - Type of Parameter list
* return_object - Where to put method's return value (if
* any). If NULL, no value is returned.
*
* RETURN: Status
*
* DESCRIPTION: Execute the requested method passing the given parameters
*
* MUTEX: Assumes namespace is locked
*
******************************************************************************/
static acpi_status
acpi_ns_execute_control_method (
struct acpi_parameter_info *info)
{
acpi_status status;
union acpi_operand_object *obj_desc;
ACPI_FUNCTION_TRACE ("ns_execute_control_method");
/* Verify that there is a method associated with this object */
obj_desc = acpi_ns_get_attached_object (info->node);
if (!obj_desc) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No attached method object\n"));
(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
return_ACPI_STATUS (AE_NULL_OBJECT);
}
ACPI_DUMP_PATHNAME (info->node, "Execute Method:",
ACPI_LV_INFO, _COMPONENT);
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Method at AML address %p Length %X\n",
obj_desc->method.aml_start + 1, obj_desc->method.aml_length - 1));
/*
* Unlock the namespace before execution. This allows namespace access
* via the external Acpi* interfaces while a method is being executed.
* However, any namespace deletion must acquire both the namespace and
* interpreter locks to ensure that no thread is using the portion of the
* namespace that is being deleted.
*/
status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/*
* Execute the method via the interpreter. The interpreter is locked
* here before calling into the AML parser
*/
status = acpi_ex_enter_interpreter ();
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
status = acpi_psx_execute (info);
acpi_ex_exit_interpreter ();
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_object_value
*
* PARAMETERS: Info - Method info block, contains:
* Node - Object's NS node
* return_object - Where to put object value (if
* any). If NULL, no value is returned.
*
* RETURN: Status
*
* DESCRIPTION: Return the current value of the object
*
* MUTEX: Assumes namespace is locked, leaves namespace unlocked
*
******************************************************************************/
static acpi_status
acpi_ns_get_object_value (
struct acpi_parameter_info *info)
{
acpi_status status = AE_OK;
struct acpi_namespace_node *resolved_node = info->node;
ACPI_FUNCTION_TRACE ("ns_get_object_value");
/*
* Objects require additional resolution steps (e.g., the Node may be a
* field that must be read, etc.) -- we can't just grab the object out of
* the node.
*/
/*
* Use resolve_node_to_value() to get the associated value. This call always
* deletes obj_desc (allocated above).
*
* NOTE: we can get away with passing in NULL for a walk state because
* obj_desc is guaranteed to not be a reference to either a method local or
* a method argument (because this interface can only be called from the
* acpi_evaluate external interface, never called from a running method.)
*
* Even though we do not directly invoke the interpreter for this, we must
* enter it because we could access an opregion. The opregion access code
* assumes that the interpreter is locked.
*
* We must release the namespace lock before entering the intepreter.
*/
status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
status = acpi_ex_enter_interpreter ();
if (ACPI_SUCCESS (status)) {
status = acpi_ex_resolve_node_to_value (&resolved_node, NULL);
/*
* If acpi_ex_resolve_node_to_value() succeeded, the return value was placed
* in resolved_node.
*/
acpi_ex_exit_interpreter ();
if (ACPI_SUCCESS (status)) {
status = AE_CTRL_RETURN_VALUE;
info->return_object = ACPI_CAST_PTR
(union acpi_operand_object, resolved_node);
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returning object %p [%s]\n",
info->return_object,
acpi_ut_get_object_type_name (info->return_object)));
}
}
/* Namespace is unlocked */
return_ACPI_STATUS (status);
}
