1 /******************************************************************************
3 * Module Name: nswalk - Functions for walking the ACPI namespace
6 *****************************************************************************/
8 /******************************************************************************
12 * Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp.
13 * All rights reserved.
17 * 2.1. This is your license from Intel Corp. under its intellectual property
18 * rights. You may have additional license terms from the party that provided
19 * you this software, covering your right to use that party's intellectual
22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
23 * copy of the source code appearing in this file ("Covered Code") an
24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
25 * base code distributed originally by Intel ("Original Intel Code") to copy,
26 * make derivatives, distribute, use and display any portion of the Covered
27 * Code in any form, with the right to sublicense such rights; and
29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
30 * license (with the right to sublicense), under only those claims of Intel
31 * patents that are infringed by the Original Intel Code, to make, use, sell,
32 * offer to sell, and import the Covered Code and derivative works thereof
33 * solely to the minimum extent necessary to exercise the above copyright
34 * license, and in no event shall the patent license extend to any additions
35 * to or modifications of the Original Intel Code. No other license or right
36 * is granted directly or by implication, estoppel or otherwise;
38 * The above copyright and patent license is granted only if the following
43 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
44 * Redistribution of source code of any substantial portion of the Covered
45 * Code or modification with rights to further distribute source must include
46 * the above Copyright Notice, the above License, this list of Conditions,
47 * and the following Disclaimer and Export Compliance provision. In addition,
48 * Licensee must cause all Covered Code to which Licensee contributes to
49 * contain a file documenting the changes Licensee made to create that Covered
50 * Code and the date of any change. Licensee must include in that file the
51 * documentation of any changes made by any predecessor Licensee. Licensee
52 * must include a prominent statement that the modification is derived,
53 * directly or indirectly, from Original Intel Code.
55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
56 * Redistribution of source code of any substantial portion of the Covered
57 * Code or modification without rights to further distribute source must
58 * include the following Disclaimer and Export Compliance provision in the
59 * documentation and/or other materials provided with distribution. In
60 * addition, Licensee may not authorize further sublicense of source of any
61 * portion of the Covered Code, and must include terms to the effect that the
62 * license from Licensee to its licensee is limited to the intellectual
63 * property embodied in the software Licensee provides to its licensee, and
64 * not to intellectual property embodied in modifications its licensee may
67 * 3.3. Redistribution of Executable. Redistribution in executable form of any
68 * substantial portion of the Covered Code or modification must reproduce the
69 * above Copyright Notice, and the following Disclaimer and Export Compliance
70 * provision in the documentation and/or other materials provided with the
73 * 3.4. Intel retains all right, title, and interest in and to the Original
76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
77 * Intel shall be used in advertising or otherwise to promote the sale, use or
78 * other dealings in products derived from or relating to the Covered Code
79 * without prior written authorization from Intel.
81 * 4. Disclaimer and Export Compliance
83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
100 * 4.3. Licensee shall not export, either directly or indirectly, any of this
101 * software or system incorporating such software without first obtaining any
102 * required license or other approval from the U. S. Department of Commerce or
103 * any other agency or department of the United States Government. In the
104 * event Licensee exports any such software from the United States or
105 * re-exports any such software from a foreign destination, Licensee shall
106 * ensure that the distribution and export/re-export of the software is in
107 * compliance with all laws, regulations, orders, or other restrictions of the
108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
109 * any of its subsidiaries will export/re-export any technical data, process,
110 * software, or service, directly or indirectly, to any country for which the
111 * United States government or any agency thereof requires an export license,
112 * other governmental approval, or letter of assurance, without first obtaining
113 * such license, approval or letter.
115 *****************************************************************************/
121 #include "acinterp.h"
122 #include "acnamesp.h"
125 #define _COMPONENT ACPI_NAMESPACE
126 MODULE_NAME ("nswalk")
129 /****************************************************************************
131 * FUNCTION: AcpiGetNextObject
133 * PARAMETERS: Type - Type of object to be searched for
134 * Parent - Parent object whose children we are
136 * LastChild - Previous child that was found.
137 * The NEXT child will be returned
139 * RETURN: ACPI_NAMESPACE_NODE - Pointer to the NEXT child or NULL if
142 * DESCRIPTION: Return the next peer object within the namespace. If Handle
143 * is valid, Scope is ignored. Otherwise, the first object
144 * within Scope is returned.
146 ****************************************************************************/
148 ACPI_NAMESPACE_NODE *
149 AcpiNsGetNextObject (
150 ACPI_OBJECT_TYPE8 Type,
151 ACPI_NAMESPACE_NODE *ParentNode,
152 ACPI_NAMESPACE_NODE *ChildNode)
154 ACPI_NAMESPACE_NODE *NextNode = NULL;
160 /* It's really the parent's _scope_ that we want */
162 if (ParentNode->Child)
164 NextNode = ParentNode->Child;
170 /* Start search at the NEXT object */
172 NextNode = AcpiNsGetNextValidObject (ChildNode);
176 /* If any type is OK, we are done */
178 if (Type == ACPI_TYPE_ANY)
180 /* NextNode is NULL if we are at the end-of-list */
186 /* Must search for the object -- but within this scope only */
190 /* If type matches, we are done */
192 if (NextNode->Type == Type)
197 /* Otherwise, move on to the next object */
199 NextNode = AcpiNsGetNextValidObject (NextNode);
209 /******************************************************************************
211 * FUNCTION: AcpiNsWalkNamespace
213 * PARAMETERS: Type - ACPI_OBJECT_TYPE to search for
214 * StartNode - Handle in namespace where search begins
215 * MaxDepth - Depth to which search is to reach
216 * UnlockBeforeCallback- Whether to unlock the NS before invoking
217 * the callback routine
218 * UserFunction - Called when an object of "Type" is found
219 * Context - Passed to user function
221 * RETURNS Return value from the UserFunction if terminated early.
222 * Otherwise, returns NULL.
224 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
225 * starting (and ending) at the object specified by StartHandle.
226 * The UserFunction is called whenever an object that matches
227 * the type parameter is found. If the user function returns
228 * a non-zero value, the search is terminated immediately and this
229 * value is returned to the caller.
231 * The point of this procedure is to provide a generic namespace
232 * walk routine that can be called from multiple places to
233 * provide multiple services; the User Function can be tailored
234 * to each task, whether it is a print function, a compare
237 ******************************************************************************/
240 AcpiNsWalkNamespace (
241 ACPI_OBJECT_TYPE8 Type,
242 ACPI_HANDLE StartNode,
244 BOOLEAN UnlockBeforeCallback,
245 ACPI_WALK_CALLBACK UserFunction,
250 ACPI_NAMESPACE_NODE *ChildNode;
251 ACPI_NAMESPACE_NODE *ParentNode;
252 ACPI_OBJECT_TYPE8 ChildType;
256 FUNCTION_TRACE ("NsWalkNamespace");
258 /* Special case for the namespace Root Node */
260 if (StartNode == ACPI_ROOT_OBJECT)
262 StartNode = AcpiGbl_RootNode;
266 /* Null child means "get first object" */
268 ParentNode = StartNode;
270 ChildType = ACPI_TYPE_ANY;
274 * Traverse the tree of objects until we bubble back up to where we
275 * started. When Level is zero, the loop is done because we have
276 * bubbled up to (and passed) the original parent handle (StartEntry)
282 * Get the next typed object in this scope. Null returned
287 ChildNode = AcpiNsGetNextObject (ACPI_TYPE_ANY,
294 * Found an object, Get the type if we are not
298 if (Type != ACPI_TYPE_ANY)
300 ChildType = ChildNode->Type;
303 if (ChildType == Type)
306 * Found a matching object, invoke the user
310 if (UnlockBeforeCallback)
312 AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
315 Status = UserFunction (ChildNode, Level,
316 Context, ReturnValue);
318 if (UnlockBeforeCallback)
320 AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
327 /* Just keep going */
330 case AE_CTRL_TERMINATE:
331 /* Exit now, with OK status */
332 return_ACPI_STATUS (AE_OK);
336 /* All others are valid exceptions */
337 return_ACPI_STATUS (Status);
343 * Depth first search:
344 * Attempt to go down another level in the namespace
345 * if we are allowed to. Don't go any further if we
346 * have reached the caller specified maximum depth
347 * or if the user function has specified that the
348 * maximum depth has been reached.
351 if ((Level < MaxDepth) && (Status != AE_CTRL_DEPTH))
353 if (AcpiNsGetNextObject (ACPI_TYPE_ANY,
357 * There is at least one child of this
358 * object, visit the object
361 ParentNode = ChildNode;
370 * No more children in this object (AcpiNsGetNextObject
371 * failed), go back upwards in the namespace tree to
372 * the object's parent.
375 ChildNode = ParentNode;
376 ParentNode = AcpiNsGetParentObject (ParentNode);
380 /* Complete walk, not terminated by user function */
381 return_ACPI_STATUS (AE_OK);