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NetBSD/sys/dist/acpica/nseval.c

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/*******************************************************************************
*
* Module Name: nseval - Object evaluation interfaces -- includes control
* method lookup and execution.
* xRevision: 1.137 $
*
******************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2006, Intel Corp.
* All rights reserved.
*
* 2. License
*
* 2.1. This is your license from Intel Corp. under its intellectual property
* rights. You may have additional license terms from the party that provided
* you this software, covering your right to use that party's intellectual
* property rights.
*
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
* copy of the source code appearing in this file ("Covered Code") an
* irrevocable, perpetual, worldwide license under Intel's copyrights in the
* base code distributed originally by Intel ("Original Intel Code") to copy,
* make derivatives, distribute, use and display any portion of the Covered
* Code in any form, with the right to sublicense such rights; and
*
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
* license (with the right to sublicense), under only those claims of Intel
* patents that are infringed by the Original Intel Code, to make, use, sell,
* offer to sell, and import the Covered Code and derivative works thereof
* solely to the minimum extent necessary to exercise the above copyright
* license, and in no event shall the patent license extend to any additions
* to or modifications of the Original Intel Code. No other license or right
* is granted directly or by implication, estoppel or otherwise;
*
* The above copyright and patent license is granted only if the following
* conditions are met:
*
* 3. Conditions
*
* 3.1. Redistribution of Source with Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification with rights to further distribute source must include
* the above Copyright Notice, the above License, this list of Conditions,
* and the following Disclaimer and Export Compliance provision. In addition,
* Licensee must cause all Covered Code to which Licensee contributes to
* contain a file documenting the changes Licensee made to create that Covered
* Code and the date of any change. Licensee must include in that file the
* documentation of any changes made by any predecessor Licensee. Licensee
* must include a prominent statement that the modification is derived,
* directly or indirectly, from Original Intel Code.
*
* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification without rights to further distribute source must
* include the following Disclaimer and Export Compliance provision in the
* documentation and/or other materials provided with distribution. In
* addition, Licensee may not authorize further sublicense of source of any
* portion of the Covered Code, and must include terms to the effect that the
* license from Licensee to its licensee is limited to the intellectual
* property embodied in the software Licensee provides to its licensee, and
* not to intellectual property embodied in modifications its licensee may
* make.
*
* 3.3. Redistribution of Executable. Redistribution in executable form of any
* substantial portion of the Covered Code or modification must reproduce the
* above Copyright Notice, and the following Disclaimer and Export Compliance
* provision in the documentation and/or other materials provided with the
* distribution.
*
* 3.4. Intel retains all right, title, and interest in and to the Original
* Intel Code.
*
* 3.5. Neither the name Intel nor any other trademark owned or controlled by
* Intel shall be used in advertising or otherwise to promote the sale, use or
* other dealings in products derived from or relating to the Covered Code
* without prior written authorization from Intel.
*
* 4. Disclaimer and Export Compliance
*
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
* LIMITED REMEDY.
*
* 4.3. Licensee shall not export, either directly or indirectly, any of this
* software or system incorporating such software without first obtaining any
* required license or other approval from the U. S. Department of Commerce or
* any other agency or department of the United States Government. In the
* event Licensee exports any such software from the United States or
* re-exports any such software from a foreign destination, Licensee shall
* ensure that the distribution and export/re-export of the software is in
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* any of its subsidiaries will export/re-export any technical data, process,
* software, or service, directly or indirectly, to any country for which the
* United States government or any agency thereof requires an export license,
* other governmental approval, or letter of assurance, without first obtaining
* such license, approval or letter.
*
*****************************************************************************/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nseval.c,v 1.1 2006/03/23 13:36:31 kochi Exp $");
#define __NSEVAL_C__
#include "acpi.h"
#include "acparser.h"
#include "acinterp.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME ("nseval")
/* Local prototypes */
static ACPI_STATUS
AcpiNsExecuteControlMethod (
ACPI_PARAMETER_INFO *Info);
static ACPI_STATUS
AcpiNsGetObjectValue (
ACPI_PARAMETER_INFO *Info);
/*******************************************************************************
*
* FUNCTION: AcpiNsEvaluateRelative
*
* PARAMETERS: Pathname - Name of method to execute, If NULL, the
* handle is the object to execute
* Info - Method info block, contains:
* ReturnObject - 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
AcpiNsEvaluateRelative (
const char *Pathname,
ACPI_PARAMETER_INFO *Info)
{
ACPI_STATUS Status;
ACPI_NAMESPACE_NODE *Node = NULL;
ACPI_GENERIC_STATE *ScopeInfo;
char *InternalPath = NULL;
ACPI_FUNCTION_TRACE ("NsEvaluateRelative");
/*
* 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 = AcpiNsInternalizeName (Pathname, &InternalPath);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
ScopeInfo = AcpiUtCreateGenericState ();
if (!ScopeInfo)
{
goto Cleanup1;
}
/* Get the prefix handle and Node */
Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
Info->Node = AcpiNsMapHandleToNode (Info->Node);
if (!Info->Node)
{
(void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
Status = AE_BAD_PARAMETER;
goto Cleanup;
}
/* Lookup the name in the namespace */
ScopeInfo->Scope.Node = Info->Node;
Status = AcpiNsLookup (ScopeInfo, InternalPath, ACPI_TYPE_ANY,
ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
&Node);
(void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (Status))
{
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Object [%s] not found [%s]\n",
Pathname, AcpiFormatException (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, AcpiNsGetAttachedObject (Node)));
Info->Node = Node;
Status = AcpiNsEvaluateByHandle (Info);
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n",
Pathname));
Cleanup:
AcpiUtDeleteGenericState (ScopeInfo);
Cleanup1:
ACPI_MEM_FREE (InternalPath);
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsEvaluateByName
*
* PARAMETERS: Pathname - Fully qualified pathname to the object
* Info - Method info block, contains:
* ReturnObject - 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
AcpiNsEvaluateByName (
const char *Pathname,
ACPI_PARAMETER_INFO *Info)
{
ACPI_STATUS Status;
char *InternalPath = NULL;
ACPI_FUNCTION_TRACE ("NsEvaluateByName");
/* Build an internal name string for the method */
Status = AcpiNsInternalizeName (Pathname, &InternalPath);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
/* Lookup the name in the namespace */
Status = AcpiNsLookup (NULL, InternalPath, ACPI_TYPE_ANY,
ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
&Info->Node);
(void) AcpiUtReleaseMutex (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, AcpiNsGetAttachedObject (Info->Node)));
Status = AcpiNsEvaluateByHandle (Info);
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n",
Pathname));
Cleanup:
/* Cleanup */
if (InternalPath)
{
ACPI_MEM_FREE (InternalPath);
}
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsEvaluateByHandle
*
* 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.
* ReturnObject - Where to put method's return value (if
* any). If NULL, no value is returned.
* ParameterType - Type of Parameter list
* ReturnObject - 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
AcpiNsEvaluateByHandle (
ACPI_PARAMETER_INFO *Info)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE ("NsEvaluateByHandle");
/* Check if namespace has been initialized */
if (!AcpiGbl_RootNode)
{
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->ReturnObject = NULL;
/* Get the prefix handle and Node */
Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
Info->Node = AcpiNsMapHandleToNode (Info->Node);
if (!Info->Node)
{
(void) AcpiUtReleaseMutex (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 (AcpiNsGetType (Info->Node) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
{
Info->Node = ACPI_CAST_PTR (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 AcpiNs* procedure
*/
if (AcpiNsGetType (Info->Node) == ACPI_TYPE_METHOD)
{
/*
* Case 1) We have an actual control method to execute
*/
Status = AcpiNsExecuteControlMethod (Info);
}
else
{
/*
* Case 2) Object is NOT a method, just return its current value
*/
Status = AcpiNsGetObjectValue (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 AcpiNs* function, so we
* just return
*/
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsExecuteControlMethod
*
* PARAMETERS: Info - Method info block, contains:
* Node - Method Node to execute
* ObjDesc - Method object
* Parameters - List of parameters to pass to the method,
* terminated by NULL. Params itself may be
* NULL if no parameters are being passed.
* ReturnObject - Where to put method's return value (if
* any). If NULL, no value is returned.
* ParameterType - Type of Parameter list
* ReturnObject - 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
AcpiNsExecuteControlMethod (
ACPI_PARAMETER_INFO *Info)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE ("NsExecuteControlMethod");
/* Verify that there is a method associated with this object */
Info->ObjDesc = AcpiNsGetAttachedObject (Info->Node);
if (!Info->ObjDesc)
{
ACPI_ERROR ((AE_INFO, "No attached method object"));
(void) AcpiUtReleaseMutex (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",
Info->ObjDesc->Method.AmlStart + 1, Info->ObjDesc->Method.AmlLength - 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 = AcpiUtReleaseMutex (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 = AcpiExEnterInterpreter ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
Status = AcpiPsExecuteMethod (Info);
AcpiExExitInterpreter ();
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsGetObjectValue
*
* PARAMETERS: Info - Method info block, contains:
* Node - Object's NS node
* ReturnObject - 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
AcpiNsGetObjectValue (
ACPI_PARAMETER_INFO *Info)
{
ACPI_STATUS Status = AE_OK;
ACPI_NAMESPACE_NODE *ResolvedNode = Info->Node;
ACPI_FUNCTION_TRACE ("NsGetObjectValue");
/*
* 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 ResolveNodeToValue() to get the associated value. This call always
* deletes ObjDesc (allocated above).
*
* NOTE: we can get away with passing in NULL for a walk state because
* ObjDesc 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
* AcpiEvaluate 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 = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
Status = AcpiExEnterInterpreter ();
if (ACPI_SUCCESS (Status))
{
Status = AcpiExResolveNodeToValue (&ResolvedNode, NULL);
/*
* If AcpiExResolveNodeToValue() succeeded, the return value was placed
* in ResolvedNode.
*/
AcpiExExitInterpreter ();
if (ACPI_SUCCESS (Status))
{
Status = AE_CTRL_RETURN_VALUE;
Info->ReturnObject = ACPI_CAST_PTR
(ACPI_OPERAND_OBJECT, ResolvedNode);
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returning object %p [%s]\n",
Info->ReturnObject,
AcpiUtGetObjectTypeName (Info->ReturnObject)));
}
}
/* Namespace is unlocked */
return_ACPI_STATUS (Status);
}
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