exresnte.c revision 281075 
1/******************************************************************************
2 *
3 * Module Name: exresnte - AML Interpreter object resolution
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2015, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions, and the following disclaimer,
16 *    without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 *    substantially similar to the "NO WARRANTY" disclaimer below
19 *    ("Disclaimer") and any redistribution must be conditioned upon
20 *    including a substantially similar Disclaimer requirement for further
21 *    binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 *    of any contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44#include <contrib/dev/acpica/include/acpi.h>
45#include <contrib/dev/acpica/include/accommon.h>
46#include <contrib/dev/acpica/include/acdispat.h>
47#include <contrib/dev/acpica/include/acinterp.h>
48#include <contrib/dev/acpica/include/acnamesp.h>
49
50
51#define _COMPONENT          ACPI_EXECUTER
52        ACPI_MODULE_NAME    ("exresnte")
53
54
55/*******************************************************************************
56 *
57 * FUNCTION:    AcpiExResolveNodeToValue
58 *
59 * PARAMETERS:  ObjectPtr       - Pointer to a location that contains
60 *                                a pointer to a NS node, and will receive a
61 *                                pointer to the resolved object.
62 *              WalkState       - Current state. Valid only if executing AML
63 *                                code. NULL if simply resolving an object
64 *
65 * RETURN:      Status
66 *
67 * DESCRIPTION: Resolve a Namespace node to a valued object
68 *
69 * Note: for some of the data types, the pointer attached to the Node
70 * can be either a pointer to an actual internal object or a pointer into the
71 * AML stream itself. These types are currently:
72 *
73 *      ACPI_TYPE_INTEGER
74 *      ACPI_TYPE_STRING
75 *      ACPI_TYPE_BUFFER
76 *      ACPI_TYPE_MUTEX
77 *      ACPI_TYPE_PACKAGE
78 *
79 ******************************************************************************/
80
81ACPI_STATUS
82AcpiExResolveNodeToValue (
83    ACPI_NAMESPACE_NODE     **ObjectPtr,
84    ACPI_WALK_STATE         *WalkState)
85
86{
87    ACPI_STATUS             Status = AE_OK;
88    ACPI_OPERAND_OBJECT     *SourceDesc;
89    ACPI_OPERAND_OBJECT     *ObjDesc = NULL;
90    ACPI_NAMESPACE_NODE     *Node;
91    ACPI_OBJECT_TYPE        EntryType;
92
93
94    ACPI_FUNCTION_TRACE (ExResolveNodeToValue);
95
96
97    /*
98     * The stack pointer points to a ACPI_NAMESPACE_NODE (Node). Get the
99     * object that is attached to the Node.
100     */
101    Node       = *ObjectPtr;
102    SourceDesc = AcpiNsGetAttachedObject (Node);
103    EntryType  = AcpiNsGetType ((ACPI_HANDLE) Node);
104
105    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
106         Node, SourceDesc, AcpiUtGetTypeName (EntryType)));
107
108    if ((EntryType == ACPI_TYPE_LOCAL_ALIAS) ||
109        (EntryType == ACPI_TYPE_LOCAL_METHOD_ALIAS))
110    {
111        /* There is always exactly one level of indirection */
112
113        Node       = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object);
114        SourceDesc = AcpiNsGetAttachedObject (Node);
115        EntryType  = AcpiNsGetType ((ACPI_HANDLE) Node);
116        *ObjectPtr = Node;
117    }
118
119    /*
120     * Several object types require no further processing:
121     * 1) Device/Thermal objects don't have a "real" subobject, return the Node
122     * 2) Method locals and arguments have a pseudo-Node
123     * 3) 10/2007: Added method type to assist with Package construction.
124     */
125    if ((EntryType == ACPI_TYPE_DEVICE)  ||
126        (EntryType == ACPI_TYPE_THERMAL) ||
127        (EntryType == ACPI_TYPE_METHOD)  ||
128        (Node->Flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL)))
129    {
130        return_ACPI_STATUS (AE_OK);
131    }
132
133    if (!SourceDesc)
134    {
135        ACPI_ERROR ((AE_INFO, "No object attached to node [%4.4s] %p",
136            Node->Name.Ascii, Node));
137        return_ACPI_STATUS (AE_AML_NO_OPERAND);
138    }
139
140    /*
141     * Action is based on the type of the Node, which indicates the type
142     * of the attached object or pointer
143     */
144    switch (EntryType)
145    {
146    case ACPI_TYPE_PACKAGE:
147
148        if (SourceDesc->Common.Type != ACPI_TYPE_PACKAGE)
149        {
150            ACPI_ERROR ((AE_INFO, "Object not a Package, type %s",
151                AcpiUtGetObjectTypeName (SourceDesc)));
152            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
153        }
154
155        Status = AcpiDsGetPackageArguments (SourceDesc);
156        if (ACPI_SUCCESS (Status))
157        {
158            /* Return an additional reference to the object */
159
160            ObjDesc = SourceDesc;
161            AcpiUtAddReference (ObjDesc);
162        }
163        break;
164
165    case ACPI_TYPE_BUFFER:
166
167        if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
168        {
169            ACPI_ERROR ((AE_INFO, "Object not a Buffer, type %s",
170                AcpiUtGetObjectTypeName (SourceDesc)));
171            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
172        }
173
174        Status = AcpiDsGetBufferArguments (SourceDesc);
175        if (ACPI_SUCCESS (Status))
176        {
177            /* Return an additional reference to the object */
178
179            ObjDesc = SourceDesc;
180            AcpiUtAddReference (ObjDesc);
181        }
182        break;
183
184    case ACPI_TYPE_STRING:
185
186        if (SourceDesc->Common.Type != ACPI_TYPE_STRING)
187        {
188            ACPI_ERROR ((AE_INFO, "Object not a String, type %s",
189                AcpiUtGetObjectTypeName (SourceDesc)));
190            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
191        }
192
193        /* Return an additional reference to the object */
194
195        ObjDesc = SourceDesc;
196        AcpiUtAddReference (ObjDesc);
197        break;
198
199    case ACPI_TYPE_INTEGER:
200
201        if (SourceDesc->Common.Type != ACPI_TYPE_INTEGER)
202        {
203            ACPI_ERROR ((AE_INFO, "Object not a Integer, type %s",
204                AcpiUtGetObjectTypeName (SourceDesc)));
205            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
206        }
207
208        /* Return an additional reference to the object */
209
210        ObjDesc = SourceDesc;
211        AcpiUtAddReference (ObjDesc);
212        break;
213
214    case ACPI_TYPE_BUFFER_FIELD:
215    case ACPI_TYPE_LOCAL_REGION_FIELD:
216    case ACPI_TYPE_LOCAL_BANK_FIELD:
217    case ACPI_TYPE_LOCAL_INDEX_FIELD:
218
219        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
220            "FieldRead Node=%p SourceDesc=%p Type=%X\n",
221            Node, SourceDesc, EntryType));
222
223        Status = AcpiExReadDataFromField (WalkState, SourceDesc, &ObjDesc);
224        break;
225
226    /* For these objects, just return the object attached to the Node */
227
228    case ACPI_TYPE_MUTEX:
229    case ACPI_TYPE_POWER:
230    case ACPI_TYPE_PROCESSOR:
231    case ACPI_TYPE_EVENT:
232    case ACPI_TYPE_REGION:
233
234        /* Return an additional reference to the object */
235
236        ObjDesc = SourceDesc;
237        AcpiUtAddReference (ObjDesc);
238        break;
239
240    /* TYPE_ANY is untyped, and thus there is no object associated with it */
241
242    case ACPI_TYPE_ANY:
243
244        ACPI_ERROR ((AE_INFO,
245            "Untyped entry %p, no attached object!", Node));
246
247        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);  /* Cannot be AE_TYPE */
248
249    case ACPI_TYPE_LOCAL_REFERENCE:
250
251        switch (SourceDesc->Reference.Class)
252        {
253        case ACPI_REFCLASS_TABLE:   /* This is a DdbHandle */
254        case ACPI_REFCLASS_REFOF:
255        case ACPI_REFCLASS_INDEX:
256
257            /* Return an additional reference to the object */
258
259            ObjDesc = SourceDesc;
260            AcpiUtAddReference (ObjDesc);
261            break;
262
263        default:
264
265            /* No named references are allowed here */
266
267            ACPI_ERROR ((AE_INFO,
268                "Unsupported Reference type 0x%X",
269                SourceDesc->Reference.Class));
270
271            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
272        }
273        break;
274
275    default:
276
277        /* Default case is for unknown types */
278
279        ACPI_ERROR ((AE_INFO,
280            "Node %p - Unknown object type 0x%X",
281            Node, EntryType));
282
283        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
284
285    } /* switch (EntryType) */
286
287
288    /* Return the object descriptor */
289
290    *ObjectPtr = (void *) ObjDesc;
291    return_ACPI_STATUS (Status);
292}
293