1 /*******************************************************************************
3 * Module Name: nsobject - Utilities for objects attached to namespace
6 ******************************************************************************/
9 * Copyright (C) 2000 - 2014, Intel Corp.
10 * All rights reserved.
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46 #define __NSOBJECT_C__
53 #define _COMPONENT ACPI_NAMESPACE
54 ACPI_MODULE_NAME ("nsobject")
57 /*******************************************************************************
59 * FUNCTION: AcpiNsAttachObject
61 * PARAMETERS: Node - Parent Node
62 * Object - Object to be attached
63 * Type - Type of object, or ACPI_TYPE_ANY if not
68 * DESCRIPTION: Record the given object as the value associated with the
69 * name whose ACPI_HANDLE is passed. If Object is NULL
70 * and Type is ACPI_TYPE_ANY, set the name as having no value.
71 * Note: Future may require that the Node->Flags field be passed
74 * MUTEX: Assumes namespace is locked
76 ******************************************************************************/
80 ACPI_NAMESPACE_NODE *Node,
81 ACPI_OPERAND_OBJECT *Object,
82 ACPI_OBJECT_TYPE Type)
84 ACPI_OPERAND_OBJECT *ObjDesc;
85 ACPI_OPERAND_OBJECT *LastObjDesc;
86 ACPI_OBJECT_TYPE ObjectType = ACPI_TYPE_ANY;
89 ACPI_FUNCTION_TRACE (NsAttachObject);
93 * Parameter validation
99 ACPI_ERROR ((AE_INFO, "Null NamedObj handle"));
100 return_ACPI_STATUS (AE_BAD_PARAMETER);
103 if (!Object && (ACPI_TYPE_ANY != Type))
107 ACPI_ERROR ((AE_INFO,
108 "Null object, but type not ACPI_TYPE_ANY"));
109 return_ACPI_STATUS (AE_BAD_PARAMETER);
112 if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED)
114 /* Not a name handle */
116 ACPI_ERROR ((AE_INFO, "Invalid handle %p [%s]",
117 Node, AcpiUtGetDescriptorName (Node)));
118 return_ACPI_STATUS (AE_BAD_PARAMETER);
121 /* Check if this object is already attached */
123 if (Node->Object == Object)
125 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
126 "Obj %p already installed in NameObj %p\n",
129 return_ACPI_STATUS (AE_OK);
132 /* If null object, we will just install it */
137 ObjectType = ACPI_TYPE_ANY;
141 * If the source object is a namespace Node with an attached object,
142 * we will use that (attached) object
144 else if ((ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_NAMED) &&
145 ((ACPI_NAMESPACE_NODE *) Object)->Object)
148 * Value passed is a name handle and that name has a
149 * non-null value. Use that name's value and type.
151 ObjDesc = ((ACPI_NAMESPACE_NODE *) Object)->Object;
152 ObjectType = ((ACPI_NAMESPACE_NODE *) Object)->Type;
156 * Otherwise, we will use the parameter object, but we must type
161 ObjDesc = (ACPI_OPERAND_OBJECT *) Object;
163 /* Use the given type */
168 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Installing %p into Node %p [%4.4s]\n",
169 ObjDesc, Node, AcpiUtGetNodeName (Node)));
171 /* Detach an existing attached object if present */
175 AcpiNsDetachObject (Node);
181 * Must increment the new value's reference count
182 * (if it is an internal object)
184 AcpiUtAddReference (ObjDesc);
187 * Handle objects with multiple descriptors - walk
188 * to the end of the descriptor list
190 LastObjDesc = ObjDesc;
191 while (LastObjDesc->Common.NextObject)
193 LastObjDesc = LastObjDesc->Common.NextObject;
196 /* Install the object at the front of the object list */
198 LastObjDesc->Common.NextObject = Node->Object;
201 Node->Type = (UINT8) ObjectType;
202 Node->Object = ObjDesc;
204 return_ACPI_STATUS (AE_OK);
208 /*******************************************************************************
210 * FUNCTION: AcpiNsDetachObject
212 * PARAMETERS: Node - A Namespace node whose object will be detached
216 * DESCRIPTION: Detach/delete an object associated with a namespace node.
217 * if the object is an allocated object, it is freed.
218 * Otherwise, the field is simply cleared.
220 ******************************************************************************/
224 ACPI_NAMESPACE_NODE *Node)
226 ACPI_OPERAND_OBJECT *ObjDesc;
229 ACPI_FUNCTION_TRACE (NsDetachObject);
232 ObjDesc = Node->Object;
235 (ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA))
240 if (Node->Flags & ANOBJ_ALLOCATED_BUFFER)
242 /* Free the dynamic aml buffer */
244 if (ObjDesc->Common.Type == ACPI_TYPE_METHOD)
246 ACPI_FREE (ObjDesc->Method.AmlStart);
250 /* Clear the Node entry in all cases */
253 if (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc) == ACPI_DESC_TYPE_OPERAND)
255 /* Unlink object from front of possible object list */
257 Node->Object = ObjDesc->Common.NextObject;
259 /* Handle possible 2-descriptor object */
262 (Node->Object->Common.Type != ACPI_TYPE_LOCAL_DATA))
264 Node->Object = Node->Object->Common.NextObject;
268 /* Reset the node type to untyped */
270 Node->Type = ACPI_TYPE_ANY;
272 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Node %p [%4.4s] Object %p\n",
273 Node, AcpiUtGetNodeName (Node), ObjDesc));
275 /* Remove one reference on the object (and all subobjects) */
277 AcpiUtRemoveReference (ObjDesc);
282 /*******************************************************************************
284 * FUNCTION: AcpiNsGetAttachedObject
286 * PARAMETERS: Node - Namespace node
288 * RETURN: Current value of the object field from the Node whose
291 * DESCRIPTION: Obtain the object attached to a namespace node.
293 ******************************************************************************/
295 ACPI_OPERAND_OBJECT *
296 AcpiNsGetAttachedObject (
297 ACPI_NAMESPACE_NODE *Node)
299 ACPI_FUNCTION_TRACE_PTR (NsGetAttachedObject, Node);
304 ACPI_WARNING ((AE_INFO, "Null Node ptr"));
309 ((ACPI_GET_DESCRIPTOR_TYPE (Node->Object) != ACPI_DESC_TYPE_OPERAND) &&
310 (ACPI_GET_DESCRIPTOR_TYPE (Node->Object) != ACPI_DESC_TYPE_NAMED)) ||
311 ((Node->Object)->Common.Type == ACPI_TYPE_LOCAL_DATA))
316 return_PTR (Node->Object);
320 /*******************************************************************************
322 * FUNCTION: AcpiNsGetSecondaryObject
324 * PARAMETERS: Node - Namespace node
326 * RETURN: Current value of the object field from the Node whose
329 * DESCRIPTION: Obtain a secondary object associated with a namespace node.
331 ******************************************************************************/
333 ACPI_OPERAND_OBJECT *
334 AcpiNsGetSecondaryObject (
335 ACPI_OPERAND_OBJECT *ObjDesc)
337 ACPI_FUNCTION_TRACE_PTR (NsGetSecondaryObject, ObjDesc);
341 (ObjDesc->Common.Type== ACPI_TYPE_LOCAL_DATA) ||
342 (!ObjDesc->Common.NextObject) ||
343 ((ObjDesc->Common.NextObject)->Common.Type == ACPI_TYPE_LOCAL_DATA))
348 return_PTR (ObjDesc->Common.NextObject);
352 /*******************************************************************************
354 * FUNCTION: AcpiNsAttachData
356 * PARAMETERS: Node - Namespace node
357 * Handler - Handler to be associated with the data
358 * Data - Data to be attached
362 * DESCRIPTION: Low-level attach data. Create and attach a Data object.
364 ******************************************************************************/
368 ACPI_NAMESPACE_NODE *Node,
369 ACPI_OBJECT_HANDLER Handler,
372 ACPI_OPERAND_OBJECT *PrevObjDesc;
373 ACPI_OPERAND_OBJECT *ObjDesc;
374 ACPI_OPERAND_OBJECT *DataDesc;
377 /* We only allow one attachment per handler */
380 ObjDesc = Node->Object;
383 if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA) &&
384 (ObjDesc->Data.Handler == Handler))
386 return (AE_ALREADY_EXISTS);
389 PrevObjDesc = ObjDesc;
390 ObjDesc = ObjDesc->Common.NextObject;
393 /* Create an internal object for the data */
395 DataDesc = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_DATA);
398 return (AE_NO_MEMORY);
401 DataDesc->Data.Handler = Handler;
402 DataDesc->Data.Pointer = Data;
404 /* Install the data object */
408 PrevObjDesc->Common.NextObject = DataDesc;
412 Node->Object = DataDesc;
419 /*******************************************************************************
421 * FUNCTION: AcpiNsDetachData
423 * PARAMETERS: Node - Namespace node
424 * Handler - Handler associated with the data
428 * DESCRIPTION: Low-level detach data. Delete the data node, but the caller
429 * is responsible for the actual data.
431 ******************************************************************************/
435 ACPI_NAMESPACE_NODE *Node,
436 ACPI_OBJECT_HANDLER Handler)
438 ACPI_OPERAND_OBJECT *ObjDesc;
439 ACPI_OPERAND_OBJECT *PrevObjDesc;
443 ObjDesc = Node->Object;
446 if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA) &&
447 (ObjDesc->Data.Handler == Handler))
451 PrevObjDesc->Common.NextObject = ObjDesc->Common.NextObject;
455 Node->Object = ObjDesc->Common.NextObject;
458 AcpiUtRemoveReference (ObjDesc);
462 PrevObjDesc = ObjDesc;
463 ObjDesc = ObjDesc->Common.NextObject;
466 return (AE_NOT_FOUND);
470 /*******************************************************************************
472 * FUNCTION: AcpiNsGetAttachedData
474 * PARAMETERS: Node - Namespace node
475 * Handler - Handler associated with the data
476 * Data - Where the data is returned
480 * DESCRIPTION: Low level interface to obtain data previously associated with
483 ******************************************************************************/
486 AcpiNsGetAttachedData (
487 ACPI_NAMESPACE_NODE *Node,
488 ACPI_OBJECT_HANDLER Handler,
491 ACPI_OPERAND_OBJECT *ObjDesc;
494 ObjDesc = Node->Object;
497 if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA) &&
498 (ObjDesc->Data.Handler == Handler))
500 *Data = ObjDesc->Data.Pointer;
504 ObjDesc = ObjDesc->Common.NextObject;
507 return (AE_NOT_FOUND);