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1 /*******************************************************************************
2 *
3 * Module Name: nseval - Object evaluation, includes control method execution
4 * $Revision: 1.143 $
5 *
6 ******************************************************************************/
8 /******************************************************************************
9 *
10 * 1. Copyright Notice
11 *
12 * Some or all of this work - Copyright (c) 1999 - 2006, Intel Corp.
13 * All rights reserved.
14 *
15 * 2. License
16 *
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
20 * property rights.
21 *
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
28 *
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;
37 *
38 * The above copyright and patent license is granted only if the following
39 * conditions are met:
40 *
41 * 3. Conditions
42 *
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.
54 *
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
65 * make.
67 *
68 * 3.3. Redistribution of Executable. Redistribution in executable form of any
69 * substantial portion of the Covered Code or modification must reproduce the
70 * above Copyright Notice, and the following Disclaimer and Export Compliance
71 * provision in the documentation and/or other materials provided with the
72 * distribution.
73 *
74 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * Intel Code.
76 *
77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
78 * Intel shall be used in advertising or otherwise to promote the sale, use or
79 * other dealings in products derived from or relating to the Covered Code
80 * without prior written authorization from Intel.
81 *
82 * 4. Disclaimer and Export Compliance
83 *
84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
85 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
87 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
88 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
89 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
90 * PARTICULAR PURPOSE.
91 *
92 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
93 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
94 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
95 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
96 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
97 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
98 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
99 * LIMITED REMEDY.
100 *
101 * 4.3. Licensee shall not export, either directly or indirectly, any of this
102 * software or system incorporating such software without first obtaining any
103 * required license or other approval from the U. S. Department of Commerce or
104 * any other agency or department of the United States Government. In the
105 * event Licensee exports any such software from the United States or
106 * re-exports any such software from a foreign destination, Licensee shall
107 * ensure that the distribution and export/re-export of the software is in
108 * compliance with all laws, regulations, orders, or other restrictions of the
109 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
110 * any of its subsidiaries will export/re-export any technical data, process,
111 * software, or service, directly or indirectly, to any country for which the
112 * United States government or any agency thereof requires an export license,
113 * other governmental approval, or letter of assurance, without first obtaining
114 * such license, approval or letter.
115 *
116 *****************************************************************************/
118 #define __NSEVAL_C__
126 #define _COMPONENT ACPI_NAMESPACE
130 /*******************************************************************************
131 *
132 * FUNCTION: AcpiNsEvaluate
133 *
134 * PARAMETERS: Info - Evaluation info block, contains:
135 * PrefixNode - Prefix or Method/Object Node to execute
136 * Pathname - Name of method to execute, If NULL, the
137 * Node is the object to execute
138 * Parameters - List of parameters to pass to the method,
139 * terminated by NULL. Params itself may be
140 * NULL if no parameters are being passed.
141 * ReturnObject - Where to put method's return value (if
142 * any). If NULL, no value is returned.
143 * ParameterType - Type of Parameter list
144 * ReturnObject - Where to put method's return value (if
145 * any). If NULL, no value is returned.
146 * Flags - ACPI_IGNORE_RETURN_VALUE to delete return
147 *
148 * RETURN: Status
149 *
150 * DESCRIPTION: Execute a control method or return the current value of an
151 * ACPI namespace object.
152 *
153 * MUTEX: Locks interpreter
154 *
155 ******************************************************************************/
157 ACPI_STATUS
160 {
161 ACPI_STATUS Status;
168 {
170 }
172 /* Initialize the return value to an invalid object */
176 /*
177 * Get the actual namespace node for the target object. Handles these cases:
178 *
179 * 1) Null node, Pathname (absolute path)
180 * 2) Node, Pathname (path relative to Node)
181 * 3) Node, Null Pathname
182 */
186 {
188 }
190 /*
191 * For a method alias, we must grab the actual method node so that proper
192 * scoping context will be established before execution.
193 */
195 {
198 }
203 /*
204 * Two major cases here:
205 *
206 * 1) The object is a control method -- execute it
207 * 2) The object is not a method -- just return it's current value
208 */
210 {
211 /*
212 * 1) Object is a control method - execute it
213 */
215 /* Verify that there is a method object associated with this node */
219 {
222 }
232 /*
233 * Any namespace deletion must acquire both the namespace and
234 * interpreter locks to ensure that no thread is using the portion of
235 * the namespace that is being deleted.
236 *
237 * Execute the method via the interpreter. The interpreter is locked
238 * here before calling into the AML parser
239 */
243 }
244 else
245 {
246 /*
247 * 2) Object is not a method, return its current value
248 */
250 /*
251 * Objects require additional resolution steps (e.g., the Node may be
252 * a field that must be read, etc.) -- we can't just grab the object
253 * out of the node.
254 *
255 * Use ResolveNodeToValue() to get the associated value.
256 *
257 * NOTE: we can get away with passing in NULL for a walk state because
258 * ResolvedNode is guaranteed to not be a reference to either a method
259 * local or a method argument (because this interface is never called
260 * from a running method.)
261 *
262 * Even though we do not directly invoke the interpreter for object
263 * resolution, we must lock it because we could access an opregion.
264 * The opregion access code assumes that the interpreter is locked.
265 */
268 /* Function has a strange interface */
273 /*
274 * If AcpiExResolveNodeToValue() succeeded, the return value was placed
275 * in ResolvedNode.
276 */
278 {
286 }
287 }
289 /*
290 * Check if there is a return value that must be dealt with
291 */
293 {
294 /* If caller does not want the return value, delete it */
297 {
300 }
302 /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
305 }
310 /*
311 * Namespace was unlocked by the handling AcpiNs* function, so we
312 * just return
313 */
315 }