/*******************************************************************************
*
* Module Name: nsxfeval - Public interfaces to the ACPI subsystem
* ACPI Object evaluation interfaces
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2016, Intel Corp.
* 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.
*/
#define EXPORT_ACPI_INTERFACES
#include "acpi.h"
#include "accommon.h"
#include "acnamesp.h"
#include "acinterp.h"
ACPI_MODULE_NAME ("nsxfeval")
/* Local prototypes */
static void
/*******************************************************************************
*
* FUNCTION: AcpiEvaluateObjectTyped
*
* PARAMETERS: Handle - Object handle (optional)
* Pathname - Object pathname (optional)
* ExternalParams - List of parameters to pass to method,
* terminated by NULL. May be NULL
* if no parameters are being passed.
* ReturnBuffer - Where to put method's return value (if
* any). If NULL, no value is returned.
* ReturnType - Expected type of return object
*
* RETURN: Status
*
* DESCRIPTION: Find and evaluate the given object, passing the given
* parameters if necessary. One of "Handle" or "Pathname" must
* be valid (non-null)
*
******************************************************************************/
{
/* Return buffer must be valid */
if (!ReturnBuffer)
{
}
{
}
/* Evaluate the object */
if (ACPI_FAILURE (Status))
{
}
/* Type ANY means "don't care" */
if (ReturnType == ACPI_TYPE_ANY)
{
}
if (ReturnBuffer->Length == 0)
{
/* Error because caller specifically asked for a return value */
}
/* Examine the object type returned from EvaluateObject */
{
}
/* Return object type does not match requested type */
"Incorrect return type [%s] requested [%s]",
if (FreeBufferOnError)
{
/*
* Free a buffer created via ACPI_ALLOCATE_BUFFER.
* Note: We use AcpiOsFree here because AcpiOsAllocate was used
* to allocate the buffer. This purposefully bypasses the
* (optionally enabled) allocation tracking mechanism since we
* only want to track internal allocations.
*/
}
ReturnBuffer->Length = 0;
}
/*******************************************************************************
*
* FUNCTION: AcpiEvaluateObject
*
* PARAMETERS: Handle - Object handle (optional)
* Pathname - Object pathname (optional)
* ExternalParams - List of parameters to pass to method,
* terminated by NULL. May be NULL
* if no parameters are being passed.
* ReturnBuffer - Where to put method's return value (if
* any). If NULL, no value is returned.
*
* RETURN: Status
*
* DESCRIPTION: Find and evaluate the given object, passing the given
* parameters if necessary. One of "Handle" or "Pathname" must
* be valid (non-null)
*
******************************************************************************/
{
UINT32 i;
/* Allocate and initialize the evaluation information block */
if (!Info)
{
}
/* Convert and validate the device handle */
if (!Info->PrefixNode)
{
goto Cleanup;
}
/*
* Get the actual namespace node for the target object.
* Handles these cases:
*
* 1) Null node, valid pathname from root (absolute path)
* 2) Node and valid pathname (path relative to Node)
* 3) Node, Null pathname
*/
if ((Pathname) &&
(ACPI_IS_ROOT_PREFIX (Pathname[0])))
{
/* The path is fully qualified, just evaluate by name */
}
else if (!Handle)
{
/*
* A handle is optional iff a fully qualified pathname is specified.
* Since we've already handled fully qualified names above, this is
* an error.
*/
if (!Pathname)
{
"Both Handle and Pathname are NULL"));
}
else
{
"Null Handle with relative pathname [%s]", Pathname));
}
goto Cleanup;
}
/*
* Convert all external objects passed as arguments to the
* internal version(s).
*/
{
/* Warn on impossible argument count */
{
"Excess arguments (%u) - using only %u",
}
/*
* Allocate a new parameter block for the internal objects
* Add 1 to count to allow for null terminated internal list
*/
if (!Info->Parameters)
{
goto Cleanup;
}
/* Convert each external object in the list to an internal object */
for (i = 0; i < Info->ParamCount; i++)
{
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
}
}
#ifdef _FUTURE_FEATURE
/*
* Begin incoming argument count analysis. Check for too few args
* and too many args.
*/
{
case ACPI_TYPE_METHOD:
/* Check incoming argument count against the method definition */
{
"Insufficient arguments (%u) - %u are required",
goto Cleanup;
}
{
"Excess arguments (%u) - only %u are required",
/* Just pass the required number of arguments */
}
/*
* Any incoming external objects to be passed as arguments to the
* method must be converted to internal objects
*/
if (Info->ParamCount)
{
/*
* Allocate a new parameter block for the internal objects
* Add 1 to count to allow for null terminated internal list
*/
if (!Info->Parameters)
{
goto Cleanup;
}
/* Convert each external object in the list to an internal object */
for (i = 0; i < Info->ParamCount; i++)
{
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
}
}
break;
default:
/* Warn if arguments passed to an object that is not a method */
if (Info->ParamCount)
{
"%u arguments were passed to a non-method ACPI object",
Info->ParamCount));
}
break;
}
#endif
/* Now we can evaluate the object */
/*
* If we are expecting a return value, and all went well above,
* copy the return value to an external object.
*/
if (!ReturnBuffer)
{
goto CleanupReturnObject;
}
if (!Info->ReturnObject)
{
ReturnBuffer->Length = 0;
goto Cleanup;
}
{
/*
* If we received a NS Node as a return object, this means that
* the object we are evaluating has nothing interesting to
* return (such as a mutex, etc.) We return an error because
* these types are essentially unsupported by this interface.
* We don't check up front because this makes it easier to add
* support for various types at a later date if necessary.
*/
ReturnBuffer->Length = 0;
}
if (ACPI_FAILURE (Status))
{
goto CleanupReturnObject;
}
/* Dereference Index and RefOf references */
/* Get the size of the returned object */
if (ACPI_SUCCESS (Status))
{
if (ACPI_FAILURE (Status))
{
/*
* Caller's buffer is too small or a new one can't
* be allocated
*/
"Needed buffer size %X, %s\n",
}
else
{
/* We have enough space for the object, build it */
}
}
if (Info->ReturnObject)
{
/*
* Delete the internal return object. NOTE: Interpreter must be
* locked to avoid race condition.
*/
/* Remove one reference on the return object (should delete it) */
}
/* Free the input parameter list (if we created one) */
if (Info->Parameters)
{
/* Free the allocated parameter block */
}
}
/*******************************************************************************
*
* FUNCTION: AcpiNsResolveReferences
*
* PARAMETERS: Info - Evaluation info block
*
* RETURN: Info->ReturnObject is replaced with the dereferenced object
*
* DESCRIPTION: Dereference certain reference objects. Called before an
* internal return object is converted to an external ACPI_OBJECT.
*
* Performs an automatic dereference of Index and RefOf reference objects.
* These reference objects are not supported by the ACPI_OBJECT, so this is a
* last resort effort to return something useful. Also, provides compatibility
* with other ACPI implementations.
*
* NOTE: does not handle references within returned package objects or nested
* references, but this support could be added later if found to be necessary.
*
******************************************************************************/
static void
{
/* We are interested in reference objects only */
{
return;
}
/*
* Two types of references are supported - those created by Index and
* RefOf operators. A name reference (AML_NAMEPATH_OP) can be converted
* to an ACPI_OBJECT, so it is not dereferenced here. A DdbHandle
* (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to
* an ACPI_OBJECT.
*/
{
case ACPI_REFCLASS_INDEX:
break;
case ACPI_REFCLASS_REFOF:
if (Node)
{
}
break;
default:
return;
}
/* Replace the existing reference object */
if (ObjDesc)
{
}
return;
}
/*******************************************************************************
*
* FUNCTION: AcpiWalkNamespace
*
* PARAMETERS: Type - ACPI_OBJECT_TYPE to search for
* StartObject - Handle in namespace where search begins
* MaxDepth - Depth to which search is to reach
* DescendingCallback - Called during tree descent
* when an object of "Type" is found
* AscendingCallback - Called during tree ascent
* when an object of "Type" is found
* Context - Passed to user function(s) above
* ReturnValue - Location where return value of
* UserFunction is put if terminated early
*
* RETURNS Return value from the UserFunction if terminated early.
* Otherwise, returns NULL.
*
* DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
* starting (and ending) at the object specified by StartHandle.
* The callback function is called whenever an object that matches
* the type parameter is found. If the callback function returns
* a non-zero value, the search is terminated immediately and this
* value is returned to the caller.
*
* The point of this procedure is to provide a generic namespace
* walk routine that can be called from multiple places to
* provide multiple services; the callback function(s) can be
* tailored to each task, whether it is a print function,
* a compare function, etc.
*
******************************************************************************/
void *Context,
void **ReturnValue)
{
/* Parameter validation */
if ((Type > ACPI_TYPE_LOCAL_MAX) ||
(!MaxDepth) ||
(!DescendingCallback && !AscendingCallback))
{
}
/*
* Need to acquire the namespace reader lock to prevent interference
* with any concurrent table unloads (which causes the deletion of
* namespace objects). We cannot allow the deletion of a namespace node
* while the user function is using it. The exception to this are the
* nodes created and deleted during control method execution -- these
* nodes are marked as temporary nodes and are ignored by the namespace
* walk. Thus, control methods can be executed while holding the
* namespace deletion lock (and the user function can execute control
* methods.)
*/
if (ACPI_FAILURE (Status))
{
}
/*
* Lock the namespace around the walk. The namespace will be
* function must be allowed to make ACPICA calls itself (for example, it
* will typically execute control methods during device enumeration.)
*/
if (ACPI_FAILURE (Status))
{
goto UnlockAndExit;
}
/* Now we can validate the starting node */
if (!AcpiNsValidateHandle (StartObject))
{
goto UnlockAndExit2;
}
(void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
(void) AcpiUtReleaseReadLock (&AcpiGbl_NamespaceRwLock);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsGetDeviceCallback
*
* PARAMETERS: Callback from AcpiGetDevice
*
* RETURN: Status
*
* DESCRIPTION: Takes callbacks from WalkNamespace and filters out all non-
* present devices, or if they specified a HID, it filters based
* on that.
*
******************************************************************************/
static ACPI_STATUS
void *Context,
void **ReturnValue)
{
UINT32 i;
int NoMatch;
if (ACPI_FAILURE (Status))
{
return (Status);
}
if (ACPI_FAILURE (Status))
{
return (Status);
}
if (!Node)
{
return (AE_BAD_PARAMETER);
}
/*
* First, filter based on the device HID and CID.
*
* 01/2010: For this case where a specific HID is requested, we don't
* want to run _STA until we have an actual HID match. Thus, we will
* not unnecessarily execute _STA on devices for which the caller
* doesn't care about. Previously, _STA was executed unconditionally
* on all devices found here.
*
* A side-effect of this change is that now we will continue to search
* for a matching HID even under device trees where the parent device
* would have returned a _STA that indicates it is not present or
* not functioning (thus aborting the search on that branch).
*/
{
if (Status == AE_NOT_FOUND)
{
return (AE_OK);
}
else if (ACPI_FAILURE (Status))
{
return (AE_CTRL_DEPTH);
}
if (NoMatch)
{
/*
* HID does not match, attempt match within the
* list of Compatible IDs (CIDs)
*/
if (Status == AE_NOT_FOUND)
{
return (AE_OK);
}
else if (ACPI_FAILURE (Status))
{
return (AE_CTRL_DEPTH);
}
/* Walk the CID list */
{
{
/* Found a matching CID */
break;
}
}
if (!Found)
{
return (AE_OK);
}
}
}
/* Run _STA to determine if device is present */
if (ACPI_FAILURE (Status))
{
return (AE_CTRL_DEPTH);
}
if (!(Flags & ACPI_STA_DEVICE_PRESENT) &&
{
/*
* Don't examine the children of the device only when the
* device is neither present nor functional. See ACPI spec,
* description of _STA for more information.
*/
return (AE_CTRL_DEPTH);
}
/* We have a valid device, invoke the user function */
return (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiGetDevices
*
* PARAMETERS: HID - HID to search for. Can be NULL.
* UserFunction - Called when a matching object is found
* Context - Passed to user function
* ReturnValue - Location where return value of
* UserFunction is put if terminated early
*
* RETURNS Return value from the UserFunction if terminated early.
* Otherwise, returns NULL.
*
* DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
* starting (and ending) at the object specified by StartHandle.
* The UserFunction is called whenever an object of type
* Device is found. If the user function returns
* a non-zero value, the search is terminated immediately and this
* value is returned to the caller.
*
* This is a wrapper for WalkNamespace, but the callback performs
* additional filtering. Please see AcpiNsGetDeviceCallback.
*
******************************************************************************/
char *HID,
void *Context,
void **ReturnValue)
{
/* Parameter validation */
if (!UserFunction)
{
}
/*
* We're going to call their callback from OUR callback, so we need
* to know what it is, and their context parameter.
*/
/*
* Lock the namespace around the walk.
* to the user function - since this function
* must be allowed to make Acpi calls itself.
*/
if (ACPI_FAILURE (Status))
{
}
(void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
}
/*******************************************************************************
*
* FUNCTION: AcpiAttachData
*
* PARAMETERS: ObjHandle - Namespace node
* Handler - Handler for this attachment
* Data - Pointer to data to be attached
*
* RETURN: Status
*
* DESCRIPTION: Attach arbitrary data and handler to a namespace node.
*
******************************************************************************/
void *Data)
{
/* Parameter validation */
if (!ObjHandle ||
!Handler ||
!Data)
{
return (AE_BAD_PARAMETER);
}
if (ACPI_FAILURE (Status))
{
return (Status);
}
/* Convert and validate the handle */
if (!Node)
{
goto UnlockAndExit;
}
(void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
return (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiDetachData
*
* PARAMETERS: ObjHandle - Namespace node handle
* Handler - Handler used in call to AcpiAttachData
*
* RETURN: Status
*
* DESCRIPTION: Remove data that was previously attached to a node.
*
******************************************************************************/
{
/* Parameter validation */
if (!ObjHandle ||
!Handler)
{
return (AE_BAD_PARAMETER);
}
if (ACPI_FAILURE (Status))
{
return (Status);
}
/* Convert and validate the handle */
if (!Node)
{
goto UnlockAndExit;
}
(void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
return (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiGetData
*
* PARAMETERS: ObjHandle - Namespace node
* Handler - Handler used in call to AttachData
* Data - Where the data is returned
*
* RETURN: Status
*
* DESCRIPTION: Retrieve data that was previously attached to a namespace node.
*
******************************************************************************/
void **Data)
{
/* Parameter validation */
if (!ObjHandle ||
!Handler ||
!Data)
{
return (AE_BAD_PARAMETER);
}
if (ACPI_FAILURE (Status))
{
return (Status);
}
/* Convert and validate the handle */
if (!Node)
{
goto UnlockAndExit;
}
(void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
return (Status);
}