ACPI_STATUS
AcpiExOpcode_1A_0T_1R (
ACPI_WALK_STATE *WalkState)
{
ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
ACPI_OPERAND_OBJECT *TempDesc;
ACPI_OPERAND_OBJECT *ReturnDesc = NULL;
ACPI_STATUS Status = AE_OK;
UINT32 Type;
UINT64 Value;
ACPI_FUNCTION_TRACE_STR (ExOpcode_1A_0T_1R,
AcpiPsGetOpcodeName (WalkState->Opcode));
/* Examine the AML opcode */
switch (WalkState->Opcode)
{
case AML_LNOT_OP: /* LNot (Operand) */
ReturnDesc = AcpiUtCreateIntegerObject ((UINT64) 0);
if (!ReturnDesc)
{
Status = AE_NO_MEMORY;
goto Cleanup;
}
/*
* Set result to ONES (TRUE) if Value == 0. Note:
* ReturnDesc->Integer.Value is initially == 0 (FALSE) from above.
*/
if (!Operand[0]->Integer.Value)
{
ReturnDesc->Integer.Value = ACPI_UINT64_MAX;
}
break;
case AML_DECREMENT_OP: /* Decrement (Operand) */
case AML_INCREMENT_OP: /* Increment (Operand) */
/*
* Create a new integer. Can't just get the base integer and
* increment it because it may be an Arg or Field.
*/
ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
if (!ReturnDesc)
{
Status = AE_NO_MEMORY;
goto Cleanup;
}
/*
* Since we are expecting a Reference operand, it can be either a
* NS Node or an internal object.
*/
TempDesc = Operand[0];
if (ACPI_GET_DESCRIPTOR_TYPE (TempDesc) == ACPI_DESC_TYPE_OPERAND)
{
/* Internal reference object - prevent deletion */
AcpiUtAddReference (TempDesc);
}
/*
* Convert the Reference operand to an Integer (This removes a
* reference on the Operand[0] object)
*
* NOTE: We use LNOT_OP here in order to force resolution of the
* reference operand to an actual integer.
*/
Status = AcpiExResolveOperands (AML_LNOT_OP, &TempDesc, WalkState);
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status,
"While resolving operands for [%s]",
AcpiPsGetOpcodeName (WalkState->Opcode)));
goto Cleanup;
}
/*
* TempDesc is now guaranteed to be an Integer object --
* Perform the actual increment or decrement
*/
if (WalkState->Opcode == AML_INCREMENT_OP)
{
ReturnDesc->Integer.Value = TempDesc->Integer.Value + 1;
}
else
{
ReturnDesc->Integer.Value = TempDesc->Integer.Value - 1;
}
/* Finished with this Integer object */
AcpiUtRemoveReference (TempDesc);
/*
* Store the result back (indirectly) through the original
* Reference object
*/
Status = AcpiExStore (ReturnDesc, Operand[0], WalkState);
break;
case AML_OBJECT_TYPE_OP: /* ObjectType (SourceObject) */
/*
* Note: The operand is not resolved at this point because we want to
* get the associated object, not its value. For example, we don't
* want to resolve a FieldUnit to its value, we want the actual
* FieldUnit object.
*/
/* Get the type of the base object */
Status = AcpiExResolveMultiple (WalkState, Operand[0], &Type, NULL);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
/* Allocate a descriptor to hold the type. */
ReturnDesc = AcpiUtCreateIntegerObject ((UINT64) Type);
if (!ReturnDesc)
{
Status = AE_NO_MEMORY;
goto Cleanup;
}
break;
case AML_SIZE_OF_OP: /* SizeOf (SourceObject) */
/*
* Note: The operand is not resolved at this point because we want to
* get the associated object, not its value.
*/
/* Get the base object */
Status = AcpiExResolveMultiple (
WalkState, Operand[0], &Type, &TempDesc);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
/*
* The type of the base object must be integer, buffer, string, or
* package. All others are not supported.
*
* NOTE: Integer is not specifically supported by the ACPI spec,
* but is supported implicitly via implicit operand conversion.
* rather than bother with conversion, we just use the byte width
* global (4 or 8 bytes).
*/
switch (Type)
{
case ACPI_TYPE_INTEGER:
Value = AcpiGbl_IntegerByteWidth;
break;
case ACPI_TYPE_STRING:
Value = TempDesc->String.Length;
break;
case ACPI_TYPE_BUFFER:
/* Buffer arguments may not be evaluated at this point */
Status = AcpiDsGetBufferArguments (TempDesc);
Value = TempDesc->Buffer.Length;
break;
case ACPI_TYPE_PACKAGE:
/* Package arguments may not be evaluated at this point */
Status = AcpiDsGetPackageArguments (TempDesc);
Value = TempDesc->Package.Count;
break;
default:
ACPI_ERROR ((AE_INFO,
"Operand must be Buffer/Integer/String/Package"
" - found type %s",
AcpiUtGetTypeName (Type)));
Status = AE_AML_OPERAND_TYPE;
goto Cleanup;
}
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
/*
* Now that we have the size of the object, create a result
* object to hold the value
*/
ReturnDesc = AcpiUtCreateIntegerObject (Value);
if (!ReturnDesc)
{
Status = AE_NO_MEMORY;
goto Cleanup;
}
break;
case AML_REF_OF_OP: /* RefOf (SourceObject) */
Status = AcpiExGetObjectReference (
Operand[0], &ReturnDesc, WalkState);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
break;
case AML_DEREF_OF_OP: /* DerefOf (ObjReference | String) */
/* Check for a method local or argument, or standalone String */
if (ACPI_GET_DESCRIPTOR_TYPE (Operand[0]) == ACPI_DESC_TYPE_NAMED)
{
TempDesc = AcpiNsGetAttachedObject (
(ACPI_NAMESPACE_NODE *) Operand[0]);
if (TempDesc &&
((TempDesc->Common.Type == ACPI_TYPE_STRING) ||
(TempDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE)))
{
Operand[0] = TempDesc;
AcpiUtAddReference (TempDesc);
}
else
{
Status = AE_AML_OPERAND_TYPE;
goto Cleanup;
}
}
else
{
switch ((Operand[0])->Common.Type)
{
case ACPI_TYPE_LOCAL_REFERENCE:
/*
* This is a DerefOf (LocalX | ArgX)
*
* Must resolve/dereference the local/arg reference first
*/
switch (Operand[0]->Reference.Class)
{
case ACPI_REFCLASS_LOCAL:
case ACPI_REFCLASS_ARG:
/* Set Operand[0] to the value of the local/arg */
Status = AcpiDsMethodDataGetValue (
Operand[0]->Reference.Class,
Operand[0]->Reference.Value,
WalkState, &TempDesc);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
/*
* Delete our reference to the input object and
* point to the object just retrieved
*/
AcpiUtRemoveReference (Operand[0]);
Operand[0] = TempDesc;
break;
case ACPI_REFCLASS_REFOF:
/* Get the object to which the reference refers */
TempDesc = Operand[0]->Reference.Object;
AcpiUtRemoveReference (Operand[0]);
Operand[0] = TempDesc;
break;
default:
/* Must be an Index op - handled below */
break;
}
break;
case ACPI_TYPE_STRING:
break;
default:
Status = AE_AML_OPERAND_TYPE;
goto Cleanup;
}
}
if (ACPI_GET_DESCRIPTOR_TYPE (Operand[0]) != ACPI_DESC_TYPE_NAMED)
{
if ((Operand[0])->Common.Type == ACPI_TYPE_STRING)
{
/*
* This is a DerefOf (String). The string is a reference
* to a named ACPI object.
*
* 1) Find the owning Node
* 2) Dereference the node to an actual object. Could be a
* Field, so we need to resolve the node to a value.
*/
Status = AcpiNsGetNodeUnlocked (WalkState->ScopeInfo->Scope.Node,
Operand[0]->String.Pointer,
ACPI_NS_SEARCH_PARENT,
ACPI_CAST_INDIRECT_PTR (
ACPI_NAMESPACE_NODE, &ReturnDesc));
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
Status = AcpiExResolveNodeToValue (
ACPI_CAST_INDIRECT_PTR (
ACPI_NAMESPACE_NODE, &ReturnDesc),
WalkState);
goto Cleanup;
}
}
/* Operand[0] may have changed from the code above */
if (ACPI_GET_DESCRIPTOR_TYPE (Operand[0]) == ACPI_DESC_TYPE_NAMED)
{
/*
* This is a DerefOf (ObjectReference)
* Get the actual object from the Node (This is the dereference).
* This case may only happen when a LocalX or ArgX is
* dereferenced above.
*/
ReturnDesc = AcpiNsGetAttachedObject (
(ACPI_NAMESPACE_NODE *) Operand[0]);
AcpiUtAddReference (ReturnDesc);
}
else
{
/*
* This must be a reference object produced by either the
* Index() or RefOf() operator
*/
switch (Operand[0]->Reference.Class)
{
case ACPI_REFCLASS_INDEX:
/*
* The target type for the Index operator must be
* either a Buffer or a Package
*/
switch (Operand[0]->Reference.TargetType)
{
case ACPI_TYPE_BUFFER_FIELD:
TempDesc = Operand[0]->Reference.Object;
/*
* Create a new object that contains one element of the
* buffer -- the element pointed to by the index.
*
* NOTE: index into a buffer is NOT a pointer to a
* sub-buffer of the main buffer, it is only a pointer to a
* single element (byte) of the buffer!
*
* Since we are returning the value of the buffer at the
* indexed location, we don't need to add an additional
* reference to the buffer itself.
*/
ReturnDesc = AcpiUtCreateIntegerObject ((UINT64)
TempDesc->Buffer.Pointer[Operand[0]->Reference.Value]);
if (!ReturnDesc)
{
Status = AE_NO_MEMORY;
goto Cleanup;
}
break;
case ACPI_TYPE_PACKAGE:
/*
* Return the referenced element of the package. We must
* add another reference to the referenced object, however.
*/
ReturnDesc = *(Operand[0]->Reference.Where);
if (!ReturnDesc)
{
/*
* Element is NULL, do not allow the dereference.
* This provides compatibility with other ACPI
* implementations.
*/
return_ACPI_STATUS (AE_AML_UNINITIALIZED_ELEMENT);
}
AcpiUtAddReference (ReturnDesc);
break;
default:
ACPI_ERROR ((AE_INFO,
"Unknown Index TargetType 0x%X in reference object %p",
Operand[0]->Reference.TargetType, Operand[0]));
Status = AE_AML_OPERAND_TYPE;
goto Cleanup;
}
break;
case ACPI_REFCLASS_REFOF:
ReturnDesc = Operand[0]->Reference.Object;
if (ACPI_GET_DESCRIPTOR_TYPE (ReturnDesc) ==
ACPI_DESC_TYPE_NAMED)
{
ReturnDesc = AcpiNsGetAttachedObject (
(ACPI_NAMESPACE_NODE *) ReturnDesc);
if (!ReturnDesc)
{
break;
}
/*
* June 2013:
* BufferFields/FieldUnits require additional resolution
*/
switch (ReturnDesc->Common.Type)
{
case ACPI_TYPE_BUFFER_FIELD:
case ACPI_TYPE_LOCAL_REGION_FIELD:
case ACPI_TYPE_LOCAL_BANK_FIELD:
case ACPI_TYPE_LOCAL_INDEX_FIELD:
Status = AcpiExReadDataFromField (
WalkState, ReturnDesc, &TempDesc);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
ReturnDesc = TempDesc;
break;
default:
/* Add another reference to the object */
AcpiUtAddReference (ReturnDesc);
break;
}
}
break;
default:
ACPI_ERROR ((AE_INFO,
"Unknown class in reference(%p) - 0x%2.2X",
Operand[0], Operand[0]->Reference.Class));
Status = AE_TYPE;
goto Cleanup;
}
}
break;
default:
ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
WalkState->Opcode));
Status = AE_AML_BAD_OPCODE;
goto Cleanup;
}
Cleanup:
/* Delete return object on error */
if (ACPI_FAILURE (Status))
{
AcpiUtRemoveReference (ReturnDesc);
}
/* Save return object on success */
else
{
WalkState->ResultObj = ReturnDesc;
}
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiExResolveObjectToValue (
ACPI_OPERAND_OBJECT **StackPtr,
ACPI_WALK_STATE *WalkState)
{
ACPI_STATUS Status = AE_OK;
ACPI_OPERAND_OBJECT *StackDesc;
void *TempNode;
ACPI_OPERAND_OBJECT *ObjDesc;
UINT16 Opcode;
FUNCTION_TRACE ("ExResolveObjectToValue");
StackDesc = *StackPtr;
/* This is an ACPI_OPERAND_OBJECT */
switch (StackDesc->Common.Type)
{
case INTERNAL_TYPE_REFERENCE:
Opcode = StackDesc->Reference.Opcode;
switch (Opcode)
{
case AML_NAME_OP:
/*
* Convert indirect name ptr to a direct name ptr.
* Then, AcpiExResolveNodeToValue can be used to get the value
*/
TempNode = StackDesc->Reference.Object;
/* Delete the Reference Object */
AcpiUtRemoveReference (StackDesc);
/* Put direct name pointer onto stack and exit */
(*StackPtr) = TempNode;
break;
case AML_LOCAL_OP:
case AML_ARG_OP:
/*
* Get the local from the method's state info
* Note: this increments the local's object reference count
*/
Status = AcpiDsMethodDataGetValue (Opcode,
StackDesc->Reference.Offset, WalkState, &ObjDesc);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/*
* Now we can delete the original Reference Object and
* replace it with the resolve value
*/
AcpiUtRemoveReference (StackDesc);
*StackPtr = ObjDesc;
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "[Arg/Local %d] ValueObj is %p\n",
StackDesc->Reference.Offset, ObjDesc));
break;
/*
* TBD: [Restructure] These next three opcodes change the type of
* the object, which is actually a no-no.
*/
case AML_ZERO_OP:
StackDesc->Common.Type = (UINT8) ACPI_TYPE_INTEGER;
StackDesc->Integer.Value = 0;
break;
case AML_ONE_OP:
StackDesc->Common.Type = (UINT8) ACPI_TYPE_INTEGER;
StackDesc->Integer.Value = 1;
break;
case AML_ONES_OP:
StackDesc->Common.Type = (UINT8) ACPI_TYPE_INTEGER;
StackDesc->Integer.Value = ACPI_INTEGER_MAX;
/* Truncate value if we are executing from a 32-bit ACPI table */
AcpiExTruncateFor32bitTable (StackDesc, WalkState);
break;
case AML_INDEX_OP:
switch (StackDesc->Reference.TargetType)
{
case ACPI_TYPE_BUFFER_FIELD:
/* Just return - leave the Reference on the stack */
break;
case ACPI_TYPE_PACKAGE:
ObjDesc = *StackDesc->Reference.Where;
if (ObjDesc)
{
/*
* Valid obj descriptor, copy pointer to return value
* (i.e., dereference the package index)
* Delete the ref object, increment the returned object
*/
AcpiUtRemoveReference (StackDesc);
AcpiUtAddReference (ObjDesc);
*StackPtr = ObjDesc;
}
else
{
/*
* A NULL object descriptor means an unitialized element of
* the package, can't dereference it
*/
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Attempt to deref an Index to NULL pkg element Idx=%p\n",
StackDesc));
Status = AE_AML_UNINITIALIZED_ELEMENT;
}
break;
default:
/* Invalid reference object */
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Unknown TargetType %X in Index/Reference obj %p\n",
StackDesc->Reference.TargetType, StackDesc));
Status = AE_AML_INTERNAL;
break;
}
break;
case AML_DEBUG_OP:
/* Just leave the object as-is */
break;
default:
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown Reference object subtype %02X in %p\n",
Opcode, StackDesc));
Status = AE_AML_INTERNAL;
break;
} /* switch (Opcode) */
break; /* case INTERNAL_TYPE_REFERENCE */
case ACPI_TYPE_BUFFER_FIELD:
ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_ANY);
if (!ObjDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
Status = AcpiExGetBufferFieldValue (StackDesc, ObjDesc);
if (ACPI_FAILURE (Status))
{
AcpiUtRemoveReference (ObjDesc);
ObjDesc = NULL;
}
*StackPtr = (void *) ObjDesc;
break;
case INTERNAL_TYPE_BANK_FIELD:
ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_ANY);
if (!ObjDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* TBD: WRONG! */
Status = AcpiExGetBufferFieldValue (StackDesc, ObjDesc);
if (ACPI_FAILURE (Status))
{
AcpiUtRemoveReference (ObjDesc);
ObjDesc = NULL;
}
*StackPtr = (void *) ObjDesc;
break;
/* TBD: [Future] - may need to handle IndexField, and DefField someday */
default:
break;
} /* switch (StackDesc->Common.Type) */
return_ACPI_STATUS (Status);
}
static ACPI_STATUS
AcpiExResolveObjectToValue (
ACPI_OPERAND_OBJECT **StackPtr,
ACPI_WALK_STATE *WalkState)
{
ACPI_STATUS Status = AE_OK;
ACPI_OPERAND_OBJECT *StackDesc;
ACPI_OPERAND_OBJECT *ObjDesc = NULL;
UINT8 RefType;
ACPI_FUNCTION_TRACE (ExResolveObjectToValue);
StackDesc = *StackPtr;
/* This is an object of type ACPI_OPERAND_OBJECT */
switch (StackDesc->Common.Type)
{
case ACPI_TYPE_LOCAL_REFERENCE:
RefType = StackDesc->Reference.Class;
switch (RefType)
{
case ACPI_REFCLASS_LOCAL:
case ACPI_REFCLASS_ARG:
/*
* Get the local from the method's state info
* Note: this increments the local's object reference count
*/
Status = AcpiDsMethodDataGetValue (RefType,
StackDesc->Reference.Value, WalkState, &ObjDesc);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Arg/Local %X] ValueObj is %p\n",
StackDesc->Reference.Value, ObjDesc));
/*
* Now we can delete the original Reference Object and
* replace it with the resolved value
*/
AcpiUtRemoveReference (StackDesc);
*StackPtr = ObjDesc;
break;
case ACPI_REFCLASS_INDEX:
switch (StackDesc->Reference.TargetType)
{
case ACPI_TYPE_BUFFER_FIELD:
/* Just return - do not dereference */
break;
case ACPI_TYPE_PACKAGE:
/* If method call or CopyObject - do not dereference */
if ((WalkState->Opcode == AML_INT_METHODCALL_OP) ||
(WalkState->Opcode == AML_COPY_OBJECT_OP))
{
break;
}
/* Otherwise, dereference the PackageIndex to a package element */
ObjDesc = *StackDesc->Reference.Where;
if (ObjDesc)
{
/*
* Valid object descriptor, copy pointer to return value
* (i.e., dereference the package index)
* Delete the ref object, increment the returned object
*/
AcpiUtAddReference (ObjDesc);
*StackPtr = ObjDesc;
}
else
{
/*
* A NULL object descriptor means an uninitialized element of
* the package, can't dereference it
*/
ACPI_ERROR ((AE_INFO,
"Attempt to dereference an Index to "
"NULL package element Idx=%p",
StackDesc));
Status = AE_AML_UNINITIALIZED_ELEMENT;
}
break;
default:
/* Invalid reference object */
ACPI_ERROR ((AE_INFO,
"Unknown TargetType 0x%X in Index/Reference object %p",
StackDesc->Reference.TargetType, StackDesc));
Status = AE_AML_INTERNAL;
break;
}
break;
case ACPI_REFCLASS_REFOF:
case ACPI_REFCLASS_DEBUG:
case ACPI_REFCLASS_TABLE:
/* Just leave the object as-is, do not dereference */
break;
case ACPI_REFCLASS_NAME: /* Reference to a named object */
/* Dereference the name */
if ((StackDesc->Reference.Node->Type == ACPI_TYPE_DEVICE) ||
(StackDesc->Reference.Node->Type == ACPI_TYPE_THERMAL))
{
/* These node types do not have 'real' subobjects */
*StackPtr = (void *) StackDesc->Reference.Node;
}
else
{
/* Get the object pointed to by the namespace node */
*StackPtr = (StackDesc->Reference.Node)->Object;
AcpiUtAddReference (*StackPtr);
}
AcpiUtRemoveReference (StackDesc);
break;
default:
ACPI_ERROR ((AE_INFO,
"Unknown Reference type 0x%X in %p",
RefType, StackDesc));
Status = AE_AML_INTERNAL;
break;
}
break;
case ACPI_TYPE_BUFFER:
Status = AcpiDsGetBufferArguments (StackDesc);
break;
case ACPI_TYPE_PACKAGE:
Status = AcpiDsGetPackageArguments (StackDesc);
break;
case ACPI_TYPE_BUFFER_FIELD:
case ACPI_TYPE_LOCAL_REGION_FIELD:
case ACPI_TYPE_LOCAL_BANK_FIELD:
case ACPI_TYPE_LOCAL_INDEX_FIELD:
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"FieldRead SourceDesc=%p Type=%X\n",
StackDesc, StackDesc->Common.Type));
Status = AcpiExReadDataFromField (WalkState, StackDesc, &ObjDesc);
/* Remove a reference to the original operand, then override */
AcpiUtRemoveReference (*StackPtr);
*StackPtr = (void *) ObjDesc;
break;
default:
break;
}
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiExResolveMultiple (
ACPI_WALK_STATE *WalkState,
ACPI_OPERAND_OBJECT *Operand,
ACPI_OBJECT_TYPE *ReturnType,
ACPI_OPERAND_OBJECT **ReturnDesc)
{
ACPI_OPERAND_OBJECT *ObjDesc = (void *) Operand;
ACPI_NAMESPACE_NODE *Node;
ACPI_OBJECT_TYPE Type;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (AcpiExResolveMultiple);
/* Operand can be either a namespace node or an operand descriptor */
switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))
{
case ACPI_DESC_TYPE_OPERAND:
Type = ObjDesc->Common.Type;
break;
case ACPI_DESC_TYPE_NAMED:
Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc);
/* If we had an Alias node, use the attached object for type info */
if (Type == ACPI_TYPE_LOCAL_ALIAS)
{
Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc);
}
break;
default:
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
/* If type is anything other than a reference, we are done */
if (Type != ACPI_TYPE_LOCAL_REFERENCE)
{
goto Exit;
}
/*
* For reference objects created via the RefOf, Index, or Load/LoadTable
* operators, we need to get to the base object (as per the ACPI
* specification of the ObjectType and SizeOf operators). This means
* traversing the list of possibly many nested references.
*/
while (ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE)
{
switch (ObjDesc->Reference.Class)
{
case ACPI_REFCLASS_REFOF:
case ACPI_REFCLASS_NAME:
/* Dereference the reference pointer */
if (ObjDesc->Reference.Class == ACPI_REFCLASS_REFOF)
{
Node = ObjDesc->Reference.Object;
}
else /* AML_INT_NAMEPATH_OP */
{
Node = ObjDesc->Reference.Node;
}
/* All "References" point to a NS node */
if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED)
{
ACPI_ERROR ((AE_INFO,
"Not a namespace node %p [%s]",
Node, AcpiUtGetDescriptorName (Node)));
return_ACPI_STATUS (AE_AML_INTERNAL);
}
/* Get the attached object */
ObjDesc = AcpiNsGetAttachedObject (Node);
if (!ObjDesc)
{
/* No object, use the NS node type */
Type = AcpiNsGetType (Node);
goto Exit;
}
/* Check for circular references */
if (ObjDesc == Operand)
{
return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE);
}
break;
case ACPI_REFCLASS_INDEX:
/* Get the type of this reference (index into another object) */
Type = ObjDesc->Reference.TargetType;
if (Type != ACPI_TYPE_PACKAGE)
{
goto Exit;
}
/*
* The main object is a package, we want to get the type
* of the individual package element that is referenced by
* the index.
*
* This could of course in turn be another reference object.
*/
ObjDesc = *(ObjDesc->Reference.Where);
if (!ObjDesc)
{
/* NULL package elements are allowed */
Type = 0; /* Uninitialized */
goto Exit;
}
break;
case ACPI_REFCLASS_TABLE:
Type = ACPI_TYPE_DDB_HANDLE;
goto Exit;
case ACPI_REFCLASS_LOCAL:
case ACPI_REFCLASS_ARG:
if (ReturnDesc)
{
Status = AcpiDsMethodDataGetValue (ObjDesc->Reference.Class,
ObjDesc->Reference.Value, WalkState, &ObjDesc);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
AcpiUtRemoveReference (ObjDesc);
}
else
{
Status = AcpiDsMethodDataGetNode (ObjDesc->Reference.Class,
ObjDesc->Reference.Value, WalkState, &Node);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
ObjDesc = AcpiNsGetAttachedObject (Node);
if (!ObjDesc)
{
Type = ACPI_TYPE_ANY;
goto Exit;
}
}
break;
case ACPI_REFCLASS_DEBUG:
/* The Debug Object is of type "DebugObject" */
Type = ACPI_TYPE_DEBUG_OBJECT;
goto Exit;
default:
ACPI_ERROR ((AE_INFO,
"Unknown Reference Class 0x%2.2X", ObjDesc->Reference.Class));
return_ACPI_STATUS (AE_AML_INTERNAL);
}
}
/*
* Now we are guaranteed to have an object that has not been created
* via the RefOf or Index operators.
*/
Type = ObjDesc->Common.Type;
Exit:
/* Convert internal types to external types */
switch (Type)
{
case ACPI_TYPE_LOCAL_REGION_FIELD:
case ACPI_TYPE_LOCAL_BANK_FIELD:
case ACPI_TYPE_LOCAL_INDEX_FIELD:
Type = ACPI_TYPE_FIELD_UNIT;
break;
case ACPI_TYPE_LOCAL_SCOPE:
/* Per ACPI Specification, Scope is untyped */
Type = ACPI_TYPE_ANY;
break;
default:
/* No change to Type required */
break;
}
*ReturnType = Type;
if (ReturnDesc)
{
*ReturnDesc = ObjDesc;
}
return_ACPI_STATUS (AE_OK);
}
