ACPI_STATUS
AcpiNsEvaluate (
ACPI_EVALUATE_INFO *Info)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (NsEvaluate);
if (!Info)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
if (!Info->Node)
{
/*
* Get the actual namespace node for the target object if we
* need to. 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
*/
Status = AcpiNsGetNode (Info->PrefixNode, Info->RelativePathname,
ACPI_NS_NO_UPSEARCH, &Info->Node);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
/*
* 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);
}
/* Complete the info block initialization */
Info->ReturnObject = NULL;
Info->NodeFlags = Info->Node->Flags;
Info->ObjDesc = AcpiNsGetAttachedObject (Info->Node);
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
Info->RelativePathname, Info->Node,
AcpiNsGetAttachedObject (Info->Node)));
/* Get info if we have a predefined name (_HID, etc.) */
Info->Predefined = AcpiUtMatchPredefinedMethod (Info->Node->Name.Ascii);
/* Get the full pathname to the object, for use in warning messages */
Info->FullPathname = AcpiNsGetExternalPathname (Info->Node);
if (!Info->FullPathname)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Count the number of arguments being passed in */
Info->ParamCount = 0;
if (Info->Parameters)
{
while (Info->Parameters[Info->ParamCount])
{
Info->ParamCount++;
}
/* Warn on impossible argument count */
if (Info->ParamCount > ACPI_METHOD_NUM_ARGS)
{
ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, ACPI_WARN_ALWAYS,
"Excess arguments (%u) - using only %u",
Info->ParamCount, ACPI_METHOD_NUM_ARGS));
Info->ParamCount = ACPI_METHOD_NUM_ARGS;
}
}
/*
* For predefined names: Check that the declared argument count
* matches the ACPI spec -- otherwise this is a BIOS error.
*/
AcpiNsCheckAcpiCompliance (Info->FullPathname, Info->Node,
Info->Predefined);
/*
* For all names: Check that the incoming argument count for
* this method/object matches the actual ASL/AML definition.
*/
AcpiNsCheckArgumentCount (Info->FullPathname, Info->Node,
Info->ParamCount, Info->Predefined);
/* For predefined names: Typecheck all incoming arguments */
AcpiNsCheckArgumentTypes (Info);
/*
* Three major evaluation cases:
*
* 1) Object types that cannot be evaluated by definition
* 2) The object is a control method -- execute it
* 3) The object is not a method -- just return it's current value
*/
switch (AcpiNsGetType (Info->Node))
{
case ACPI_TYPE_DEVICE:
case ACPI_TYPE_EVENT:
case ACPI_TYPE_MUTEX:
case ACPI_TYPE_REGION:
case ACPI_TYPE_THERMAL:
case ACPI_TYPE_LOCAL_SCOPE:
/*
* 1) Disallow evaluation of certain object types. For these,
* object evaluation is undefined and not supported.
*/
ACPI_ERROR ((AE_INFO,
"%s: Evaluation of object type [%s] is not supported",
Info->FullPathname,
AcpiUtGetTypeName (Info->Node->Type)));
Status = AE_TYPE;
goto Cleanup;
case ACPI_TYPE_METHOD:
/*
* 2) Object is a control method - execute it
*/
/* Verify that there is a method object associated with this node */
if (!Info->ObjDesc)
{
ACPI_ERROR ((AE_INFO, "%s: Method has no attached sub-object",
Info->FullPathname));
Status = AE_NULL_OBJECT;
goto Cleanup;
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"**** Execute method [%s] at AML address %p length %X\n",
Info->FullPathname,
Info->ObjDesc->Method.AmlStart + 1,
Info->ObjDesc->Method.AmlLength - 1));
/*
* 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.
*
* Execute the method via the interpreter. The interpreter is locked
* here before calling into the AML parser
*/
AcpiExEnterInterpreter ();
Status = AcpiPsExecuteMethod (Info);
AcpiExExitInterpreter ();
break;
default:
/*
* 3) All other non-method objects -- get the current object value
*/
/*
* Some 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.
*
* NOTE: we can get away with passing in NULL for a walk state because
* the Node is guaranteed to not be a reference to either a method
* local or a method argument (because this interface is never called
* from a running method.)
*
* Even though we do not directly invoke the interpreter for object
* resolution, we must lock it because we could access an OpRegion.
* The OpRegion access code assumes that the interpreter is locked.
*/
AcpiExEnterInterpreter ();
/* TBD: ResolveNodeToValue has a strange interface, fix */
Info->ReturnObject = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Info->Node);
Status = AcpiExResolveNodeToValue (ACPI_CAST_INDIRECT_PTR (
ACPI_NAMESPACE_NODE, &Info->ReturnObject), NULL);
AcpiExExitInterpreter ();
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returned object %p [%s]\n",
Info->ReturnObject,
AcpiUtGetObjectTypeName (Info->ReturnObject)));
Status = AE_CTRL_RETURN_VALUE; /* Always has a "return value" */
break;
}
/*
* For predefined names, check the return value against the ACPI
* specification. Some incorrect return value types are repaired.
*/
(void) AcpiNsCheckReturnValue (Info->Node, Info, Info->ParamCount,
Status, &Info->ReturnObject);
/* Check if there is a return value that must be dealt with */
if (Status == AE_CTRL_RETURN_VALUE)
{
/* If caller does not want the return value, delete it */
if (Info->Flags & ACPI_IGNORE_RETURN_VALUE)
{
AcpiUtRemoveReference (Info->ReturnObject);
Info->ReturnObject = NULL;
}
/* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
Status = AE_OK;
}
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
"*** Completed evaluation of object %s ***\n",
Info->RelativePathname));
Cleanup:
/*
* Namespace was unlocked by the handling AcpiNs* function, so we
* just free the pathname and return
*/
ACPI_FREE (Info->FullPathname);
Info->FullPathname = NULL;
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiNsEvaluate (
ACPI_EVALUATE_INFO *Info)
{
ACPI_STATUS Status;
ACPI_NAMESPACE_NODE *Node;
ACPI_FUNCTION_TRACE (NsEvaluate);
if (!Info)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Initialize the return value to an invalid object */
Info->ReturnObject = NULL;
Info->ParamCount = 0;
/*
* Get the actual namespace node for the target object. Handles these cases:
*
* 1) Null node, Pathname (absolute path)
* 2) Node, Pathname (path relative to Node)
* 3) Node, Null Pathname
*/
Status = AcpiNsGetNode (Info->PrefixNode, Info->Pathname,
ACPI_NS_NO_UPSEARCH, &Info->ResolvedNode);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/*
* For a method alias, we must grab the actual method node so that proper
* scoping context will be established before execution.
*/
if (AcpiNsGetType (Info->ResolvedNode) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
{
Info->ResolvedNode =
ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Info->ResolvedNode->Object);
}
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n", Info->Pathname,
Info->ResolvedNode, AcpiNsGetAttachedObject (Info->ResolvedNode)));
Node = Info->ResolvedNode;
/*
* Two major cases here:
*
* 1) The object is a control method -- execute it
* 2) The object is not a method -- just return it's current value
*/
if (AcpiNsGetType (Info->ResolvedNode) == ACPI_TYPE_METHOD)
{
/*
* 1) Object is a control method - execute it
*/
/* Verify that there is a method object associated with this node */
Info->ObjDesc = AcpiNsGetAttachedObject (Info->ResolvedNode);
if (!Info->ObjDesc)
{
ACPI_ERROR ((AE_INFO, "Control method has no attached sub-object"));
return_ACPI_STATUS (AE_NULL_OBJECT);
}
/* Count the number of arguments being passed to the method */
if (Info->Parameters)
{
while (Info->Parameters[Info->ParamCount])
{
if (Info->ParamCount > ACPI_METHOD_MAX_ARG)
{
return_ACPI_STATUS (AE_LIMIT);
}
Info->ParamCount++;
}
}
ACPI_DUMP_PATHNAME (Info->ResolvedNode, "ACPI: 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));
/*
* 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.
*
* Execute the method via the interpreter. The interpreter is locked
* here before calling into the AML parser
*/
AcpiExEnterInterpreter ();
Status = AcpiPsExecuteMethod (Info);
AcpiExExitInterpreter ();
}
else
{
/*
* 2) Object is not a method, return its current value
*
* Disallow certain object types. For these, "evaluation" is undefined.
*/
switch (Info->ResolvedNode->Type)
{
case ACPI_TYPE_DEVICE:
case ACPI_TYPE_EVENT:
case ACPI_TYPE_MUTEX:
case ACPI_TYPE_REGION:
case ACPI_TYPE_THERMAL:
case ACPI_TYPE_LOCAL_SCOPE:
ACPI_ERROR ((AE_INFO,
"[%4.4s] Evaluation of object type [%s] is not supported",
Info->ResolvedNode->Name.Ascii,
AcpiUtGetTypeName (Info->ResolvedNode->Type)));
return_ACPI_STATUS (AE_TYPE);
default:
break;
}
/*
* 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.
*
* NOTE: we can get away with passing in NULL for a walk state because
* ResolvedNode is guaranteed to not be a reference to either a method
* local or a method argument (because this interface is never called
* from a running method.)
*
* Even though we do not directly invoke the interpreter for object
* resolution, we must lock it because we could access an opregion.
* The opregion access code assumes that the interpreter is locked.
*/
AcpiExEnterInterpreter ();
/* Function has a strange interface */
Status = AcpiExResolveNodeToValue (&Info->ResolvedNode, NULL);
AcpiExExitInterpreter ();
/*
* If AcpiExResolveNodeToValue() succeeded, the return value was placed
* in ResolvedNode.
*/
if (ACPI_SUCCESS (Status))
{
Status = AE_CTRL_RETURN_VALUE;
Info->ReturnObject =
ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Info->ResolvedNode);
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returning object %p [%s]\n",
Info->ReturnObject,
AcpiUtGetObjectTypeName (Info->ReturnObject)));
}
}
/*
* Check input argument count against the ASL-defined count for a method.
* Also check predefined names: argument count and return value against
* the ACPI specification. Some incorrect return value types are repaired.
*/
(void) AcpiNsCheckPredefinedNames (Node, Info->ParamCount,
Status, &Info->ReturnObject);
/* Check if there is a return value that must be dealt with */
if (Status == AE_CTRL_RETURN_VALUE)
{
/* If caller does not want the return value, delete it */
if (Info->Flags & ACPI_IGNORE_RETURN_VALUE)
{
AcpiUtRemoveReference (Info->ReturnObject);
Info->ReturnObject = NULL;
}
/* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
Status = AE_OK;
}
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
"*** Completed evaluation of object %s ***\n", Info->Pathname));
/*
* Namespace was unlocked by the handling AcpiNs* function, so we
* just return
*/
return_ACPI_STATUS (Status);
}
