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exresnte.c
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1 
2 /******************************************************************************
3  *
4  * Module Name: exresnte - AML Interpreter object resolution
5  *
6  *****************************************************************************/
7 
8 /*
9  * Copyright (C) 2000 - 2012, 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 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acdispat.h"
48 #include "acinterp.h"
49 #include "acnamesp.h"
50 
51 #define _COMPONENT ACPI_EXECUTER
52 ACPI_MODULE_NAME("exresnte")
53 
54 /*******************************************************************************
55  *
56  * FUNCTION: acpi_ex_resolve_node_to_value
57  *
58  * PARAMETERS: object_ptr - Pointer to a location that contains
59  * a pointer to a NS node, and will receive a
60  * pointer to the resolved object.
61  * walk_state - Current state. Valid only if executing AML
62  * code. NULL if simply resolving an object
63  *
64  * RETURN: Status
65  *
66  * DESCRIPTION: Resolve a Namespace node to a valued object
67  *
68  * Note: for some of the data types, the pointer attached to the Node
69  * can be either a pointer to an actual internal object or a pointer into the
70  * AML stream itself. These types are currently:
71  *
72  * ACPI_TYPE_INTEGER
73  * ACPI_TYPE_STRING
74  * ACPI_TYPE_BUFFER
75  * ACPI_TYPE_MUTEX
76  * ACPI_TYPE_PACKAGE
77  *
78  ******************************************************************************/
81  struct acpi_walk_state *walk_state)
82 {
84  union acpi_operand_object *source_desc;
85  union acpi_operand_object *obj_desc = NULL;
86  struct acpi_namespace_node *node;
87  acpi_object_type entry_type;
88 
89  ACPI_FUNCTION_TRACE(ex_resolve_node_to_value);
90 
91  /*
92  * The stack pointer points to a struct acpi_namespace_node (Node). Get the
93  * object that is attached to the Node.
94  */
95  node = *object_ptr;
96  source_desc = acpi_ns_get_attached_object(node);
97  entry_type = acpi_ns_get_type((acpi_handle) node);
98 
99  ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
100  node, source_desc,
101  acpi_ut_get_type_name(entry_type)));
102 
103  if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) ||
104  (entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
105 
106  /* There is always exactly one level of indirection */
107 
108  node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object);
109  source_desc = acpi_ns_get_attached_object(node);
110  entry_type = acpi_ns_get_type((acpi_handle) node);
111  *object_ptr = node;
112  }
113 
114  /*
115  * Several object types require no further processing:
116  * 1) Device/Thermal objects don't have a "real" subobject, return the Node
117  * 2) Method locals and arguments have a pseudo-Node
118  * 3) 10/2007: Added method type to assist with Package construction.
119  */
120  if ((entry_type == ACPI_TYPE_DEVICE) ||
121  (entry_type == ACPI_TYPE_THERMAL) ||
122  (entry_type == ACPI_TYPE_METHOD) ||
123  (node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) {
125  }
126 
127  if (!source_desc) {
128  ACPI_ERROR((AE_INFO, "No object attached to node %p", node));
130  }
131 
132  /*
133  * Action is based on the type of the Node, which indicates the type
134  * of the attached object or pointer
135  */
136  switch (entry_type) {
137  case ACPI_TYPE_PACKAGE:
138 
139  if (source_desc->common.type != ACPI_TYPE_PACKAGE) {
140  ACPI_ERROR((AE_INFO, "Object not a Package, type %s",
141  acpi_ut_get_object_type_name(source_desc)));
143  }
144 
145  status = acpi_ds_get_package_arguments(source_desc);
146  if (ACPI_SUCCESS(status)) {
147 
148  /* Return an additional reference to the object */
149 
150  obj_desc = source_desc;
151  acpi_ut_add_reference(obj_desc);
152  }
153  break;
154 
155  case ACPI_TYPE_BUFFER:
156 
157  if (source_desc->common.type != ACPI_TYPE_BUFFER) {
158  ACPI_ERROR((AE_INFO, "Object not a Buffer, type %s",
159  acpi_ut_get_object_type_name(source_desc)));
161  }
162 
163  status = acpi_ds_get_buffer_arguments(source_desc);
164  if (ACPI_SUCCESS(status)) {
165 
166  /* Return an additional reference to the object */
167 
168  obj_desc = source_desc;
169  acpi_ut_add_reference(obj_desc);
170  }
171  break;
172 
173  case ACPI_TYPE_STRING:
174 
175  if (source_desc->common.type != ACPI_TYPE_STRING) {
176  ACPI_ERROR((AE_INFO, "Object not a String, type %s",
177  acpi_ut_get_object_type_name(source_desc)));
179  }
180 
181  /* Return an additional reference to the object */
182 
183  obj_desc = source_desc;
184  acpi_ut_add_reference(obj_desc);
185  break;
186 
187  case ACPI_TYPE_INTEGER:
188 
189  if (source_desc->common.type != ACPI_TYPE_INTEGER) {
190  ACPI_ERROR((AE_INFO, "Object not a Integer, type %s",
191  acpi_ut_get_object_type_name(source_desc)));
193  }
194 
195  /* Return an additional reference to the object */
196 
197  obj_desc = source_desc;
198  acpi_ut_add_reference(obj_desc);
199  break;
200 
205 
207  "FieldRead Node=%p SourceDesc=%p Type=%X\n",
208  node, source_desc, entry_type));
209 
210  status =
211  acpi_ex_read_data_from_field(walk_state, source_desc,
212  &obj_desc);
213  break;
214 
215  /* For these objects, just return the object attached to the Node */
216 
217  case ACPI_TYPE_MUTEX:
218  case ACPI_TYPE_POWER:
219  case ACPI_TYPE_PROCESSOR:
220  case ACPI_TYPE_EVENT:
221  case ACPI_TYPE_REGION:
222 
223  /* Return an additional reference to the object */
224 
225  obj_desc = source_desc;
226  acpi_ut_add_reference(obj_desc);
227  break;
228 
229  /* TYPE_ANY is untyped, and thus there is no object associated with it */
230 
231  case ACPI_TYPE_ANY:
232 
234  "Untyped entry %p, no attached object!", node));
235 
236  return_ACPI_STATUS(AE_AML_OPERAND_TYPE); /* Cannot be AE_TYPE */
237 
239 
240  switch (source_desc->reference.class) {
241  case ACPI_REFCLASS_TABLE: /* This is a ddb_handle */
242  case ACPI_REFCLASS_REFOF:
243  case ACPI_REFCLASS_INDEX:
244 
245  /* Return an additional reference to the object */
246 
247  obj_desc = source_desc;
248  acpi_ut_add_reference(obj_desc);
249  break;
250 
251  default:
252  /* No named references are allowed here */
253 
255  "Unsupported Reference type 0x%X",
256  source_desc->reference.class));
257 
259  }
260  break;
261 
262  default:
263 
264  /* Default case is for unknown types */
265 
267  "Node %p - Unknown object type 0x%X",
268  node, entry_type));
269 
271 
272  } /* switch (entry_type) */
273 
274  /* Return the object descriptor */
275 
276  *object_ptr = (void *)obj_desc;
277  return_ACPI_STATUS(status);
278 }