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;
269 * Detach the object from any data objects (which are still held by
270 * the namespace node)
273 if (ObjDesc->Common.NextObject &&
274 ((ObjDesc->Common.NextObject)->Common.Type == ACPI_TYPE_LOCAL_DATA))
276 ObjDesc->Common.NextObject = NULL;
279 /* Reset the node type to untyped */
281 Node->Type = ACPI_TYPE_ANY;
283 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Node %p [%4.4s] Object %p\n",
284 Node, AcpiUtGetNodeName (Node), ObjDesc));
286 /* Remove one reference on the object (and all subobjects) */
288 AcpiUtRemoveReference (ObjDesc);
293 /*******************************************************************************
295 * FUNCTION: AcpiNsGetAttachedObject
297 * PARAMETERS: Node - Namespace node
299 * RETURN: Current value of the object field from the Node whose
302 * DESCRIPTION: Obtain the object attached to a namespace node.
304 ******************************************************************************/
306 ACPI_OPERAND_OBJECT *
307 AcpiNsGetAttachedObject (
308 ACPI_NAMESPACE_NODE *Node)
310 ACPI_FUNCTION_TRACE_PTR (NsGetAttachedObject, Node);
315 ACPI_WARNING ((AE_INFO, "Null Node ptr"));
320 ((ACPI_GET_DESCRIPTOR_TYPE (Node->Object) != ACPI_DESC_TYPE_OPERAND) &&
321 (ACPI_GET_DESCRIPTOR_TYPE (Node->Object) != ACPI_DESC_TYPE_NAMED)) ||
322 ((Node->Object)->Common.Type == ACPI_TYPE_LOCAL_DATA))
327 return_PTR (Node->Object);
331 /*******************************************************************************
333 * FUNCTION: AcpiNsGetSecondaryObject
335 * PARAMETERS: Node - Namespace node
337 * RETURN: Current value of the object field from the Node whose
340 * DESCRIPTION: Obtain a secondary object associated with a namespace node.
342 ******************************************************************************/
344 ACPI_OPERAND_OBJECT *
345 AcpiNsGetSecondaryObject (
346 ACPI_OPERAND_OBJECT *ObjDesc)
348 ACPI_FUNCTION_TRACE_PTR (NsGetSecondaryObject, ObjDesc);
352 (ObjDesc->Common.Type== ACPI_TYPE_LOCAL_DATA) ||
353 (!ObjDesc->Common.NextObject) ||
354 ((ObjDesc->Common.NextObject)->Common.Type == ACPI_TYPE_LOCAL_DATA))
359 return_PTR (ObjDesc->Common.NextObject);
363 /*******************************************************************************
365 * FUNCTION: AcpiNsAttachData
367 * PARAMETERS: Node - Namespace node
368 * Handler - Handler to be associated with the data
369 * Data - Data to be attached
373 * DESCRIPTION: Low-level attach data. Create and attach a Data object.
375 ******************************************************************************/
379 ACPI_NAMESPACE_NODE *Node,
380 ACPI_OBJECT_HANDLER Handler,
383 ACPI_OPERAND_OBJECT *PrevObjDesc;
384 ACPI_OPERAND_OBJECT *ObjDesc;
385 ACPI_OPERAND_OBJECT *DataDesc;
388 /* We only allow one attachment per handler */
391 ObjDesc = Node->Object;
394 if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA) &&
395 (ObjDesc->Data.Handler == Handler))
397 return (AE_ALREADY_EXISTS);
400 PrevObjDesc = ObjDesc;
401 ObjDesc = ObjDesc->Common.NextObject;
404 /* Create an internal object for the data */
406 DataDesc = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_DATA);
409 return (AE_NO_MEMORY);
412 DataDesc->Data.Handler = Handler;
413 DataDesc->Data.Pointer = Data;
415 /* Install the data object */
419 PrevObjDesc->Common.NextObject = DataDesc;
423 Node->Object = DataDesc;
430 /*******************************************************************************
432 * FUNCTION: AcpiNsDetachData
434 * PARAMETERS: Node - Namespace node
435 * Handler - Handler associated with the data
439 * DESCRIPTION: Low-level detach data. Delete the data node, but the caller
440 * is responsible for the actual data.
442 ******************************************************************************/
446 ACPI_NAMESPACE_NODE *Node,
447 ACPI_OBJECT_HANDLER Handler)
449 ACPI_OPERAND_OBJECT *ObjDesc;
450 ACPI_OPERAND_OBJECT *PrevObjDesc;
454 ObjDesc = Node->Object;
457 if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA) &&
458 (ObjDesc->Data.Handler == Handler))
462 PrevObjDesc->Common.NextObject = ObjDesc->Common.NextObject;
466 Node->Object = ObjDesc->Common.NextObject;
469 AcpiUtRemoveReference (ObjDesc);
473 PrevObjDesc = ObjDesc;
474 ObjDesc = ObjDesc->Common.NextObject;
477 return (AE_NOT_FOUND);
481 /*******************************************************************************
483 * FUNCTION: AcpiNsGetAttachedData
485 * PARAMETERS: Node - Namespace node
486 * Handler - Handler associated with the data
487 * Data - Where the data is returned
491 * DESCRIPTION: Low level interface to obtain data previously associated with
494 ******************************************************************************/
497 AcpiNsGetAttachedData (
498 ACPI_NAMESPACE_NODE *Node,
499 ACPI_OBJECT_HANDLER Handler,
502 ACPI_OPERAND_OBJECT *ObjDesc;
505 ObjDesc = Node->Object;
508 if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA) &&
509 (ObjDesc->Data.Handler == Handler))
511 *Data = ObjDesc->Data.Pointer;
515 ObjDesc = ObjDesc->Common.NextObject;
518 return (AE_NOT_FOUND);