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/*******************************************************************************
*
* Module Name: nseval - Object evaluation interfaces -- includes control
* method lookup and execution.
* $Revision: 102 $
*
******************************************************************************/
/*
* 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 "amlcode.h"
#include "acparser.h"
#include "acinterp.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_NAMESPACE
MODULE_NAME ("nseval")
/*******************************************************************************
*
* FUNCTION: Acpi_ns_evaluate_relative
*
* PARAMETERS: Handle - The relative containing object
* *Pathname - Name of method to execute, If NULL, the
* handle is the object to execute
* **Params - 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.
*
* RETURN: Status
*
* DESCRIPTION: Find and execute the requested method using the handle as a
* scope
*
* MUTEX: Locks Namespace
*
******************************************************************************/
acpi_status
acpi_ns_evaluate_relative (
acpi_namespace_node *handle,
NATIVE_CHAR *pathname,
acpi_operand_object **params,
acpi_operand_object **return_object)
{
acpi_namespace_node *prefix_node;
acpi_status status;
acpi_namespace_node *node = NULL;
NATIVE_CHAR *internal_path = NULL;
acpi_generic_state scope_info;
FUNCTION_TRACE ("Ns_evaluate_relative");
/*
* Must have a valid object handle
*/
if (!handle) {
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);
}
/* Get the prefix handle and Node */
acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
prefix_node = acpi_ns_map_handle_to_node (handle);
if (!prefix_node) {
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
status = AE_BAD_PARAMETER;
goto cleanup;
}
/* Lookup the name in the namespace */
scope_info.scope.node = prefix_node;
status = acpi_ns_lookup (&scope_info, internal_path, ACPI_TYPE_ANY,
IMODE_EXECUTE, NS_NO_UPSEARCH, NULL,
&node);
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "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_INFO, "%s [%p] Value %p\n",
pathname, node, node->object));
status = acpi_ns_evaluate_by_handle (node, params, return_object);
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "*** Completed eval of object %s ***\n",
pathname));
cleanup:
ACPI_MEM_FREE (internal_path);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_evaluate_by_name
*
* PARAMETERS: Pathname - Fully qualified pathname to the object
* *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: Find and execute the requested method passing the given
* parameters
*
* MUTEX: Locks Namespace
*
******************************************************************************/
acpi_status
acpi_ns_evaluate_by_name (
NATIVE_CHAR *pathname,
acpi_operand_object **params,
acpi_operand_object **return_object)
{
acpi_status status;
acpi_namespace_node *node = NULL;
NATIVE_CHAR *internal_path = NULL;
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);
}
acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
/* Lookup the name in the namespace */
status = acpi_ns_lookup (NULL, internal_path, ACPI_TYPE_ANY,
IMODE_EXECUTE, NS_NO_UPSEARCH, NULL,
&node);
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "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_INFO, "%s [%p] Value %p\n",
pathname, node, node->object));
status = acpi_ns_evaluate_by_handle (node, params, return_object);
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "*** 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: Handle - Method Node to execute
* **Params - 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.
*
* RETURN: Status
*
* DESCRIPTION: Execute the requested method passing the given parameters
*
* MUTEX: Locks Namespace
*
******************************************************************************/
acpi_status
acpi_ns_evaluate_by_handle (
acpi_namespace_node *handle,
acpi_operand_object **params,
acpi_operand_object **return_object)
{
acpi_namespace_node *node;
acpi_status status;
acpi_operand_object *local_return_object;
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 (!handle) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
if (return_object) {
/* Initialize the return value to an invalid object */
*return_object = NULL;
}
/* Get the prefix handle and Node */
acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
node = acpi_ns_map_handle_to_node (handle);
if (!node) {
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/*
* 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 (node) == ACPI_TYPE_METHOD) {
/*
* Case 1) We have an actual control method to execute
*/
status = acpi_ns_execute_control_method (node, params,
&local_return_object);
}
else {
/*
* Case 2) Object is NOT a method, just return its
* current value
*/
status = acpi_ns_get_object_value (node, &local_return_object);
}
/*
* Check if there is a return value on the stack that must
* be dealt with
*/
if (status == AE_CTRL_RETURN_VALUE) {
/*
* If the Method returned a value and the caller
* provided a place to store a returned value, Copy
* the returned value to the object descriptor provided
* by the caller.
*/
if (return_object) {
/*
* Valid return object, copy the pointer to
* the returned object
*/
*return_object = local_return_object;
}
/* Map AE_RETURN_VALUE to AE_OK, we are done with it */
if (status == AE_CTRL_RETURN_VALUE) {
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: Method_node - The object/method
* **Params - List of parameters to pass to the method,
* terminated by NULL. Params itself may be
* NULL if no parameters are being passed.
* **Return_obj_desc - List of result objects to be returned
* from the method.
*
* RETURN: Status
*
* DESCRIPTION: Execute the requested method passing the given parameters
*
* MUTEX: Assumes namespace is locked
*
******************************************************************************/
acpi_status
acpi_ns_execute_control_method (
acpi_namespace_node *method_node,
acpi_operand_object **params,
acpi_operand_object **return_obj_desc)
{
acpi_status status;
acpi_operand_object *obj_desc;
FUNCTION_TRACE ("Ns_execute_control_method");
/* Verify that there is a method associated with this object */
obj_desc = acpi_ns_get_attached_object (method_node);
if (!obj_desc) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No attached method object\n"));
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
return_ACPI_STATUS (AE_NULL_OBJECT);
}
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Control method at Offset %p Length %x]\n",
obj_desc->method.aml_start + 1, obj_desc->method.aml_length - 1));
DUMP_PATHNAME (method_node, "Ns_execute_control_method: Executing",
ACPI_LV_NAMES, _COMPONENT);
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "At offset %p\n",
obj_desc->method.aml_start + 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.
*/
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
/*
* 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 (method_node, params, return_obj_desc);
acpi_ex_exit_interpreter ();
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_get_object_value
*
* PARAMETERS: Node - The object
*
* RETURN: Status
*
* DESCRIPTION: Return the current value of the object
*
* MUTEX: Assumes namespace is locked
*
******************************************************************************/
acpi_status
acpi_ns_get_object_value (
acpi_namespace_node *node,
acpi_operand_object **return_obj_desc)
{
acpi_status status = AE_OK;
acpi_operand_object *obj_desc;
acpi_operand_object *source_desc;
FUNCTION_TRACE ("Ns_get_object_value");
/*
* We take the value from certain objects directly
*/
if ((node->type == ACPI_TYPE_PROCESSOR) ||
(node->type == ACPI_TYPE_POWER)) {
/*
* Create a Reference object to contain the object
*/
obj_desc = acpi_ut_create_internal_object (node->type);
if (!obj_desc) {
status = AE_NO_MEMORY;
goto unlock_and_exit;
}
/*
* Get the attached object
*/
source_desc = acpi_ns_get_attached_object (node);
if (!source_desc) {
status = AE_NULL_OBJECT;
goto unlock_and_exit;
}
/*
* Just copy from the original to the return object
*
* TBD: [Future] - need a low-level object copy that handles
* the reference count automatically. (Don't want to copy it)
*/
MEMCPY (obj_desc, source_desc, sizeof (acpi_operand_object));
obj_desc->common.reference_count = 1;
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
}
/*
* Other objects require a reference object wrapper which we
* then attempt to resolve.
*/
else {
/* Create an Reference object to contain the object */
obj_desc = acpi_ut_create_internal_object (INTERNAL_TYPE_REFERENCE);
if (!obj_desc) {
status = AE_NO_MEMORY;
goto unlock_and_exit;
}
/* Construct a descriptor pointing to the name */
obj_desc->reference.opcode = (u8) AML_NAME_OP;
obj_desc->reference.object = (void *) node;
/*
* Use Resolve_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
*
* 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.
*/
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
status = acpi_ex_enter_interpreter ();
if (ACPI_SUCCESS (status)) {
status = acpi_ex_resolve_to_value (&obj_desc, NULL);
acpi_ex_exit_interpreter ();
}
}
/*
* If Acpi_ex_resolve_to_value() succeeded, the return value was
* placed in Obj_desc.
*/
if (ACPI_SUCCESS (status)) {
status = AE_CTRL_RETURN_VALUE;
*return_obj_desc = obj_desc;
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Returning obj %p\n", *return_obj_desc));
}
/* Namespace is unlocked */
return_ACPI_STATUS (status);
unlock_and_exit:
/* Unlock the namespace */
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
return_ACPI_STATUS (status);
}
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