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 * Detach the object from any data objects (which are still held by
269 * the namespace node)
271 if (ObjDesc->Common.NextObject &&
272 ((ObjDesc->Common.NextObject)->Common.Type == ACPI_TYPE_LOCAL_DATA))
274 ObjDesc->Common.NextObject = NULL;
278 /* Reset the node type to untyped */
280 Node->Type = ACPI_TYPE_ANY;
282 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Node %p [%4.4s] Object %p\n",
283 Node, AcpiUtGetNodeName (Node), ObjDesc));
285 /* Remove one reference on the object (and all subobjects) */
287 AcpiUtRemoveReference (ObjDesc);
292 /*******************************************************************************
294 * FUNCTION: AcpiNsGetAttachedObject
296 * PARAMETERS: Node - Namespace node
298 * RETURN: Current value of the object field from the Node whose
301 * DESCRIPTION: Obtain the object attached to a namespace node.
303 ******************************************************************************/
305 ACPI_OPERAND_OBJECT *
306 AcpiNsGetAttachedObject (
307 ACPI_NAMESPACE_NODE *Node)
309 ACPI_FUNCTION_TRACE_PTR (NsGetAttachedObject, Node);
314 ACPI_WARNING ((AE_INFO, "Null Node ptr"));
319 ((ACPI_GET_DESCRIPTOR_TYPE (Node->Object) != ACPI_DESC_TYPE_OPERAND) &&
320 (ACPI_GET_DESCRIPTOR_TYPE (Node->Object) != ACPI_DESC_TYPE_NAMED)) ||
321 ((Node->Object)->Common.Type == ACPI_TYPE_LOCAL_DATA))
326 return_PTR (Node->Object);
330 /*******************************************************************************
332 * FUNCTION: AcpiNsGetSecondaryObject
334 * PARAMETERS: Node - Namespace node
336 * RETURN: Current value of the object field from the Node whose
339 * DESCRIPTION: Obtain a secondary object associated with a namespace node.
341 ******************************************************************************/
343 ACPI_OPERAND_OBJECT *
344 AcpiNsGetSecondaryObject (
345 ACPI_OPERAND_OBJECT *ObjDesc)
347 ACPI_FUNCTION_TRACE_PTR (NsGetSecondaryObject, ObjDesc);
351 (ObjDesc->Common.Type== ACPI_TYPE_LOCAL_DATA) ||
352 (!ObjDesc->Common.NextObject) ||
353 ((ObjDesc->Common.NextObject)->Common.Type == ACPI_TYPE_LOCAL_DATA))
358 return_PTR (ObjDesc->Common.NextObject);
362 /*******************************************************************************
364 * FUNCTION: AcpiNsAttachData
366 * PARAMETERS: Node - Namespace node
367 * Handler - Handler to be associated with the data
368 * Data - Data to be attached
372 * DESCRIPTION: Low-level attach data. Create and attach a Data object.
374 ******************************************************************************/
378 ACPI_NAMESPACE_NODE *Node,
379 ACPI_OBJECT_HANDLER Handler,
382 ACPI_OPERAND_OBJECT *PrevObjDesc;
383 ACPI_OPERAND_OBJECT *ObjDesc;
384 ACPI_OPERAND_OBJECT *DataDesc;
387 /* We only allow one attachment per handler */
390 ObjDesc = Node->Object;
393 if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA) &&
394 (ObjDesc->Data.Handler == Handler))
396 return (AE_ALREADY_EXISTS);
399 PrevObjDesc = ObjDesc;
400 ObjDesc = ObjDesc->Common.NextObject;
403 /* Create an internal object for the data */
405 DataDesc = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_DATA);
408 return (AE_NO_MEMORY);
411 DataDesc->Data.Handler = Handler;
412 DataDesc->Data.Pointer = Data;
414 /* Install the data object */
418 PrevObjDesc->Common.NextObject = DataDesc;
422 Node->Object = DataDesc;
429 /*******************************************************************************
431 * FUNCTION: AcpiNsDetachData
433 * PARAMETERS: Node - Namespace node
434 * Handler - Handler associated with the data
438 * DESCRIPTION: Low-level detach data. Delete the data node, but the caller
439 * is responsible for the actual data.
441 ******************************************************************************/
445 ACPI_NAMESPACE_NODE *Node,
446 ACPI_OBJECT_HANDLER Handler)
448 ACPI_OPERAND_OBJECT *ObjDesc;
449 ACPI_OPERAND_OBJECT *PrevObjDesc;
453 ObjDesc = Node->Object;
456 if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA) &&
457 (ObjDesc->Data.Handler == Handler))
461 PrevObjDesc->Common.NextObject = ObjDesc->Common.NextObject;
465 Node->Object = ObjDesc->Common.NextObject;
468 AcpiUtRemoveReference (ObjDesc);
472 PrevObjDesc = ObjDesc;
473 ObjDesc = ObjDesc->Common.NextObject;
476 return (AE_NOT_FOUND);
480 /*******************************************************************************
482 * FUNCTION: AcpiNsGetAttachedData
484 * PARAMETERS: Node - Namespace node
485 * Handler - Handler associated with the data
486 * Data - Where the data is returned
490 * DESCRIPTION: Low level interface to obtain data previously associated with
493 ******************************************************************************/
496 AcpiNsGetAttachedData (
497 ACPI_NAMESPACE_NODE *Node,
498 ACPI_OBJECT_HANDLER Handler,
501 ACPI_OPERAND_OBJECT *ObjDesc;
504 ObjDesc = Node->Object;
507 if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA) &&
508 (ObjDesc->Data.Handler == Handler))
510 *Data = ObjDesc->Data.Pointer;
514 ObjDesc = ObjDesc->Common.NextObject;
517 return (AE_NOT_FOUND);