ACPI_STATUS
AcpiDsMethodDataInitArgs (
ACPI_OPERAND_OBJECT **Params,
UINT32 MaxParamCount,
ACPI_WALK_STATE *WalkState)
{
ACPI_STATUS Status;
UINT32 Index = 0;
ACPI_FUNCTION_TRACE_PTR (DsMethodDataInitArgs, Params);
if (!Params)
{
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"No parameter list passed to method\n"));
return_ACPI_STATUS (AE_OK);
}
/* Copy passed parameters into the new method stack frame */
while ((Index < ACPI_METHOD_NUM_ARGS) &&
(Index < MaxParamCount) &&
Params[Index])
{
/*
* A valid parameter.
* Store the argument in the method/walk descriptor.
* Do not copy the arg in order to implement call by reference
*/
Status = AcpiDsMethodDataSetValue (
ACPI_REFCLASS_ARG, Index, Params[Index], WalkState);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
Index++;
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%u args passed to method\n", Index));
return_ACPI_STATUS (AE_OK);
}
ACPI_STATUS
AcpiDsStoreObjectToLocal (
UINT8 Type,
UINT32 Index,
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_WALK_STATE *WalkState)
{
ACPI_STATUS Status;
ACPI_NAMESPACE_NODE *Node;
ACPI_OPERAND_OBJECT *CurrentObjDesc;
ACPI_OPERAND_OBJECT *NewObjDesc;
ACPI_FUNCTION_TRACE (DsStoreObjectToLocal);
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Type=%2.2X Index=%u Obj=%p\n",
Type, Index, ObjDesc));
/* Parameter validation */
if (!ObjDesc)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Get the namespace node for the arg/local */
Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
CurrentObjDesc = AcpiNsGetAttachedObject (Node);
if (CurrentObjDesc == ObjDesc)
{
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p already installed!\n",
ObjDesc));
return_ACPI_STATUS (Status);
}
/*
* If the reference count on the object is more than one, we must
* take a copy of the object before we store. A reference count
* of exactly 1 means that the object was just created during the
* evaluation of an expression, and we can safely use it since it
* is not used anywhere else.
*/
NewObjDesc = ObjDesc;
if (ObjDesc->Common.ReferenceCount > 1)
{
Status = AcpiUtCopyIobjectToIobject (ObjDesc, &NewObjDesc, WalkState);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
/*
* If there is an object already in this slot, we either
* have to delete it, or if this is an argument and there
* is an object reference stored there, we have to do
* an indirect store!
*/
if (CurrentObjDesc)
{
/*
* Check for an indirect store if an argument
* contains an object reference (stored as an Node).
* We don't allow this automatic dereferencing for
* locals, since a store to a local should overwrite
* anything there, including an object reference.
*
* If both Arg0 and Local0 contain RefOf (Local4):
*
* Store (1, Arg0) - Causes indirect store to local4
* Store (1, Local0) - Stores 1 in local0, overwriting
* the reference to local4
* Store (1, DeRefof (Local0)) - Causes indirect store to local4
*
* Weird, but true.
*/
if (Type == ACPI_REFCLASS_ARG)
{
/*
* If we have a valid reference object that came from RefOf(),
* do the indirect store
*/
if ((ACPI_GET_DESCRIPTOR_TYPE (CurrentObjDesc) == ACPI_DESC_TYPE_OPERAND) &&
(CurrentObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
(CurrentObjDesc->Reference.Class == ACPI_REFCLASS_REFOF))
{
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Arg (%p) is an ObjRef(Node), storing in node %p\n",
NewObjDesc, CurrentObjDesc));
/*
* Store this object to the Node (perform the indirect store)
* NOTE: No implicit conversion is performed, as per the ACPI
* specification rules on storing to Locals/Args.
*/
Status = AcpiExStoreObjectToNode (NewObjDesc,
CurrentObjDesc->Reference.Object, WalkState,
ACPI_NO_IMPLICIT_CONVERSION);
/* Remove local reference if we copied the object above */
if (NewObjDesc != ObjDesc)
{
AcpiUtRemoveReference (NewObjDesc);
}
return_ACPI_STATUS (Status);
}
}
/* Delete the existing object before storing the new one */
AcpiDsMethodDataDeleteValue (Type, Index, WalkState);
}
/*
* Install the Obj descriptor (*NewObjDesc) into
* the descriptor for the Arg or Local.
* (increments the object reference count by one)
*/
Status = AcpiDsMethodDataSetValue (Type, Index, NewObjDesc, WalkState);
/* Remove local reference if we copied the object above */
if (NewObjDesc != ObjDesc)
{
AcpiUtRemoveReference (NewObjDesc);
}
return_ACPI_STATUS (Status);
}