exresnte.c revision 245582 
1/******************************************************************************
2 *
3 * Module Name: exresnte - AML Interpreter object resolution
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2013, 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#define __EXRESNTE_C__
45
46#include <contrib/dev/acpica/include/acpi.h>
47#include <contrib/dev/acpica/include/accommon.h>
48#include <contrib/dev/acpica/include/acdispat.h>
49#include <contrib/dev/acpica/include/acinterp.h>
50#include <contrib/dev/acpica/include/acnamesp.h>
51
52
53#define _COMPONENT          ACPI_EXECUTER
54        ACPI_MODULE_NAME    ("exresnte")
55
56
57/*******************************************************************************
58 *
59 * FUNCTION:    AcpiExResolveNodeToValue
60 *
61 * PARAMETERS:  ObjectPtr       - Pointer to a location that contains
62 *                                a pointer to a NS node, and will receive a
63 *                                pointer to the resolved object.
64 *              WalkState       - Current state. Valid only if executing AML
65 *                                code. NULL if simply resolving an object
66 *
67 * RETURN:      Status
68 *
69 * DESCRIPTION: Resolve a Namespace node to a valued object
70 *
71 * Note: for some of the data types, the pointer attached to the Node
72 * can be either a pointer to an actual internal object or a pointer into the
73 * AML stream itself. These types are currently:
74 *
75 *      ACPI_TYPE_INTEGER
76 *      ACPI_TYPE_STRING
77 *      ACPI_TYPE_BUFFER
78 *      ACPI_TYPE_MUTEX
79 *      ACPI_TYPE_PACKAGE
80 *
81 ******************************************************************************/
82
83ACPI_STATUS
84AcpiExResolveNodeToValue (
85    ACPI_NAMESPACE_NODE     **ObjectPtr,
86    ACPI_WALK_STATE         *WalkState)
87
88{
89    ACPI_STATUS             Status = AE_OK;
90    ACPI_OPERAND_OBJECT     *SourceDesc;
91    ACPI_OPERAND_OBJECT     *ObjDesc = NULL;
92    ACPI_NAMESPACE_NODE     *Node;
93    ACPI_OBJECT_TYPE        EntryType;
94
95
96    ACPI_FUNCTION_TRACE (ExResolveNodeToValue);
97
98
99    /*
100     * The stack pointer points to a ACPI_NAMESPACE_NODE (Node). Get the
101     * object that is attached to the Node.
102     */
103    Node       = *ObjectPtr;
104    SourceDesc = AcpiNsGetAttachedObject (Node);
105    EntryType  = AcpiNsGetType ((ACPI_HANDLE) Node);
106
107    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
108         Node, SourceDesc, AcpiUtGetTypeName (EntryType)));
109
110    if ((EntryType == ACPI_TYPE_LOCAL_ALIAS) ||
111        (EntryType == ACPI_TYPE_LOCAL_METHOD_ALIAS))
112    {
113        /* There is always exactly one level of indirection */
114
115        Node       = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object);
116        SourceDesc = AcpiNsGetAttachedObject (Node);
117        EntryType  = AcpiNsGetType ((ACPI_HANDLE) Node);
118        *ObjectPtr = Node;
119    }
120
121    /*
122     * Several object types require no further processing:
123     * 1) Device/Thermal objects don't have a "real" subobject, return the Node
124     * 2) Method locals and arguments have a pseudo-Node
125     * 3) 10/2007: Added method type to assist with Package construction.
126     */
127    if ((EntryType == ACPI_TYPE_DEVICE)  ||
128        (EntryType == ACPI_TYPE_THERMAL) ||
129        (EntryType == ACPI_TYPE_METHOD)  ||
130        (Node->Flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL)))
131    {
132        return_ACPI_STATUS (AE_OK);
133    }
134
135    if (!SourceDesc)
136    {
137        ACPI_ERROR ((AE_INFO, "No object attached to node %p",
138            Node));
139        return_ACPI_STATUS (AE_AML_NO_OPERAND);
140    }
141
142    /*
143     * Action is based on the type of the Node, which indicates the type
144     * of the attached object or pointer
145     */
146    switch (EntryType)
147    {
148    case ACPI_TYPE_PACKAGE:
149
150        if (SourceDesc->Common.Type != ACPI_TYPE_PACKAGE)
151        {
152            ACPI_ERROR ((AE_INFO, "Object not a Package, type %s",
153                AcpiUtGetObjectTypeName (SourceDesc)));
154            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
155        }
156
157        Status = AcpiDsGetPackageArguments (SourceDesc);
158        if (ACPI_SUCCESS (Status))
159        {
160            /* Return an additional reference to the object */
161
162            ObjDesc = SourceDesc;
163            AcpiUtAddReference (ObjDesc);
164        }
165        break;
166
167
168    case ACPI_TYPE_BUFFER:
169
170        if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
171        {
172            ACPI_ERROR ((AE_INFO, "Object not a Buffer, type %s",
173                AcpiUtGetObjectTypeName (SourceDesc)));
174            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
175        }
176
177        Status = AcpiDsGetBufferArguments (SourceDesc);
178        if (ACPI_SUCCESS (Status))
179        {
180            /* Return an additional reference to the object */
181
182            ObjDesc = SourceDesc;
183            AcpiUtAddReference (ObjDesc);
184        }
185        break;
186
187
188    case ACPI_TYPE_STRING:
189
190        if (SourceDesc->Common.Type != ACPI_TYPE_STRING)
191        {
192            ACPI_ERROR ((AE_INFO, "Object not a String, type %s",
193                AcpiUtGetObjectTypeName (SourceDesc)));
194            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
195        }
196
197        /* Return an additional reference to the object */
198
199        ObjDesc = SourceDesc;
200        AcpiUtAddReference (ObjDesc);
201        break;
202
203
204    case ACPI_TYPE_INTEGER:
205
206        if (SourceDesc->Common.Type != ACPI_TYPE_INTEGER)
207        {
208            ACPI_ERROR ((AE_INFO, "Object not a Integer, type %s",
209                AcpiUtGetObjectTypeName (SourceDesc)));
210            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
211        }
212
213        /* Return an additional reference to the object */
214
215        ObjDesc = SourceDesc;
216        AcpiUtAddReference (ObjDesc);
217        break;
218
219
220    case ACPI_TYPE_BUFFER_FIELD:
221    case ACPI_TYPE_LOCAL_REGION_FIELD:
222    case ACPI_TYPE_LOCAL_BANK_FIELD:
223    case ACPI_TYPE_LOCAL_INDEX_FIELD:
224
225        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
226            "FieldRead Node=%p SourceDesc=%p Type=%X\n",
227            Node, SourceDesc, EntryType));
228
229        Status = AcpiExReadDataFromField (WalkState, SourceDesc, &ObjDesc);
230        break;
231
232    /* For these objects, just return the object attached to the Node */
233
234    case ACPI_TYPE_MUTEX:
235    case ACPI_TYPE_POWER:
236    case ACPI_TYPE_PROCESSOR:
237    case ACPI_TYPE_EVENT:
238    case ACPI_TYPE_REGION:
239
240        /* Return an additional reference to the object */
241
242        ObjDesc = SourceDesc;
243        AcpiUtAddReference (ObjDesc);
244        break;
245
246    /* TYPE_ANY is untyped, and thus there is no object associated with it */
247
248    case ACPI_TYPE_ANY:
249
250        ACPI_ERROR ((AE_INFO,
251            "Untyped entry %p, no attached object!", Node));
252
253        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);  /* Cannot be AE_TYPE */
254
255
256    case ACPI_TYPE_LOCAL_REFERENCE:
257
258        switch (SourceDesc->Reference.Class)
259        {
260        case ACPI_REFCLASS_TABLE:   /* This is a DdbHandle */
261        case ACPI_REFCLASS_REFOF:
262        case ACPI_REFCLASS_INDEX:
263
264            /* Return an additional reference to the object */
265
266            ObjDesc = SourceDesc;
267            AcpiUtAddReference (ObjDesc);
268            break;
269
270        default:
271            /* No named references are allowed here */
272
273            ACPI_ERROR ((AE_INFO,
274                "Unsupported Reference type 0x%X",
275                SourceDesc->Reference.Class));
276
277            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
278        }
279        break;
280
281
282    default:
283
284        /* Default case is for unknown types */
285
286        ACPI_ERROR ((AE_INFO,
287            "Node %p - Unknown object type 0x%X",
288            Node, EntryType));
289
290        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
291
292    } /* switch (EntryType) */
293
294
295    /* Return the object descriptor */
296
297    *ObjectPtr = (void *) ObjDesc;
298    return_ACPI_STATUS (Status);
299}
300