exresnte.c revision 217365 
1
2/******************************************************************************
3 *
4 * Module Name: exresnte - AML Interpreter object resolution
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2011, Intel Corp.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions, and the following disclaimer,
17 *    without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 *    substantially similar to the "NO WARRANTY" disclaimer below
20 *    ("Disclaimer") and any redistribution must be conditioned upon
21 *    including a substantially similar Disclaimer requirement for further
22 *    binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 *    of any contributors may be used to endorse or promote products derived
25 *    from this software without specific prior written permission.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
30 *
31 * NO WARRANTY
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
45#define __EXRESNTE_C__
46
47#include <contrib/dev/acpica/include/acpi.h>
48#include <contrib/dev/acpica/include/accommon.h>
49#include <contrib/dev/acpica/include/acdispat.h>
50#include <contrib/dev/acpica/include/acinterp.h>
51#include <contrib/dev/acpica/include/acnamesp.h>
52
53
54#define _COMPONENT          ACPI_EXECUTER
55        ACPI_MODULE_NAME    ("exresnte")
56
57
58/*******************************************************************************
59 *
60 * FUNCTION:    AcpiExResolveNodeToValue
61 *
62 * PARAMETERS:  ObjectPtr       - Pointer to a location that contains
63 *                                a pointer to a NS node, and will receive a
64 *                                pointer to the resolved object.
65 *              WalkState       - Current state.  Valid only if executing AML
66 *                                code.  NULL if simply resolving an object
67 *
68 * RETURN:      Status
69 *
70 * DESCRIPTION: Resolve a Namespace node to a valued object
71 *
72 * Note: for some of the data types, the pointer attached to the Node
73 * can be either a pointer to an actual internal object or a pointer into the
74 * AML stream itself.  These types are currently:
75 *
76 *      ACPI_TYPE_INTEGER
77 *      ACPI_TYPE_STRING
78 *      ACPI_TYPE_BUFFER
79 *      ACPI_TYPE_MUTEX
80 *      ACPI_TYPE_PACKAGE
81 *
82 ******************************************************************************/
83
84ACPI_STATUS
85AcpiExResolveNodeToValue (
86    ACPI_NAMESPACE_NODE     **ObjectPtr,
87    ACPI_WALK_STATE         *WalkState)
88
89{
90    ACPI_STATUS             Status = AE_OK;
91    ACPI_OPERAND_OBJECT     *SourceDesc;
92    ACPI_OPERAND_OBJECT     *ObjDesc = NULL;
93    ACPI_NAMESPACE_NODE     *Node;
94    ACPI_OBJECT_TYPE        EntryType;
95
96
97    ACPI_FUNCTION_TRACE (ExResolveNodeToValue);
98
99
100    /*
101     * The stack pointer points to a ACPI_NAMESPACE_NODE (Node).  Get the
102     * object that is attached to the Node.
103     */
104    Node       = *ObjectPtr;
105    SourceDesc = AcpiNsGetAttachedObject (Node);
106    EntryType  = AcpiNsGetType ((ACPI_HANDLE) Node);
107
108    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
109         Node, SourceDesc, AcpiUtGetTypeName (EntryType)));
110
111    if ((EntryType == ACPI_TYPE_LOCAL_ALIAS) ||
112        (EntryType == ACPI_TYPE_LOCAL_METHOD_ALIAS))
113    {
114        /* There is always exactly one level of indirection */
115
116        Node       = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object);
117        SourceDesc = AcpiNsGetAttachedObject (Node);
118        EntryType  = AcpiNsGetType ((ACPI_HANDLE) Node);
119        *ObjectPtr = Node;
120    }
121
122    /*
123     * Several object types require no further processing:
124     * 1) Device/Thermal objects don't have a "real" subobject, return the Node
125     * 2) Method locals and arguments have a pseudo-Node
126     * 3) 10/2007: Added method type to assist with Package construction.
127     */
128    if ((EntryType == ACPI_TYPE_DEVICE)  ||
129        (EntryType == ACPI_TYPE_THERMAL) ||
130        (EntryType == ACPI_TYPE_METHOD)  ||
131        (Node->Flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL)))
132    {
133        return_ACPI_STATUS (AE_OK);
134    }
135
136    if (!SourceDesc)
137    {
138        ACPI_ERROR ((AE_INFO, "No object attached to node %p",
139            Node));
140        return_ACPI_STATUS (AE_AML_NO_OPERAND);
141    }
142
143    /*
144     * Action is based on the type of the Node, which indicates the type
145     * of the attached object or pointer
146     */
147    switch (EntryType)
148    {
149    case ACPI_TYPE_PACKAGE:
150
151        if (SourceDesc->Common.Type != ACPI_TYPE_PACKAGE)
152        {
153            ACPI_ERROR ((AE_INFO, "Object not a Package, type %s",
154                AcpiUtGetObjectTypeName (SourceDesc)));
155            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
156        }
157
158        Status = AcpiDsGetPackageArguments (SourceDesc);
159        if (ACPI_SUCCESS (Status))
160        {
161            /* Return an additional reference to the object */
162
163            ObjDesc = SourceDesc;
164            AcpiUtAddReference (ObjDesc);
165        }
166        break;
167
168
169    case ACPI_TYPE_BUFFER:
170
171        if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
172        {
173            ACPI_ERROR ((AE_INFO, "Object not a Buffer, type %s",
174                AcpiUtGetObjectTypeName (SourceDesc)));
175            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
176        }
177
178        Status = AcpiDsGetBufferArguments (SourceDesc);
179        if (ACPI_SUCCESS (Status))
180        {
181            /* Return an additional reference to the object */
182
183            ObjDesc = SourceDesc;
184            AcpiUtAddReference (ObjDesc);
185        }
186        break;
187
188
189    case ACPI_TYPE_STRING:
190
191        if (SourceDesc->Common.Type != ACPI_TYPE_STRING)
192        {
193            ACPI_ERROR ((AE_INFO, "Object not a String, type %s",
194                AcpiUtGetObjectTypeName (SourceDesc)));
195            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
196        }
197
198        /* Return an additional reference to the object */
199
200        ObjDesc = SourceDesc;
201        AcpiUtAddReference (ObjDesc);
202        break;
203
204
205    case ACPI_TYPE_INTEGER:
206
207        if (SourceDesc->Common.Type != ACPI_TYPE_INTEGER)
208        {
209            ACPI_ERROR ((AE_INFO, "Object not a Integer, type %s",
210                AcpiUtGetObjectTypeName (SourceDesc)));
211            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
212        }
213
214        /* Return an additional reference to the object */
215
216        ObjDesc = SourceDesc;
217        AcpiUtAddReference (ObjDesc);
218        break;
219
220
221    case ACPI_TYPE_BUFFER_FIELD:
222    case ACPI_TYPE_LOCAL_REGION_FIELD:
223    case ACPI_TYPE_LOCAL_BANK_FIELD:
224    case ACPI_TYPE_LOCAL_INDEX_FIELD:
225
226        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
227            "FieldRead Node=%p SourceDesc=%p Type=%X\n",
228            Node, SourceDesc, EntryType));
229
230        Status = AcpiExReadDataFromField (WalkState, SourceDesc, &ObjDesc);
231        break;
232
233    /* For these objects, just return the object attached to the Node */
234
235    case ACPI_TYPE_MUTEX:
236    case ACPI_TYPE_POWER:
237    case ACPI_TYPE_PROCESSOR:
238    case ACPI_TYPE_EVENT:
239    case ACPI_TYPE_REGION:
240
241        /* Return an additional reference to the object */
242
243        ObjDesc = SourceDesc;
244        AcpiUtAddReference (ObjDesc);
245        break;
246
247    /* TYPE_ANY is untyped, and thus there is no object associated with it */
248
249    case ACPI_TYPE_ANY:
250
251        ACPI_ERROR ((AE_INFO,
252            "Untyped entry %p, no attached object!", Node));
253
254        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);  /* Cannot be AE_TYPE */
255
256
257    case ACPI_TYPE_LOCAL_REFERENCE:
258
259        switch (SourceDesc->Reference.Class)
260        {
261        case ACPI_REFCLASS_TABLE:   /* This is a DdbHandle */
262        case ACPI_REFCLASS_REFOF:
263        case ACPI_REFCLASS_INDEX:
264
265            /* Return an additional reference to the object */
266
267            ObjDesc = SourceDesc;
268            AcpiUtAddReference (ObjDesc);
269            break;
270
271        default:
272            /* No named references are allowed here */
273
274            ACPI_ERROR ((AE_INFO,
275                "Unsupported Reference type 0x%X",
276                SourceDesc->Reference.Class));
277
278            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
279        }
280        break;
281
282
283    default:
284
285        /* Default case is for unknown types */
286
287        ACPI_ERROR ((AE_INFO,
288            "Node %p - Unknown object type 0x%X",
289            Node, EntryType));
290
291        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
292
293    } /* switch (EntryType) */
294
295
296    /* Return the object descriptor */
297
298    *ObjectPtr = (void *) ObjDesc;
299    return_ACPI_STATUS (Status);
300}
301
302
303