Merge branch 'master' of /repos/git/net-2.6
[linux-2.6] / drivers / acpi / acpica / exstoren.c
1
2 /******************************************************************************
3  *
4  * Module Name: exstoren - AML Interpreter object store support,
5  *                        Store to Node (namespace object)
6  *
7  *****************************************************************************/
8
9 /*
10  * Copyright (C) 2000 - 2008, Intel Corp.
11  * All rights reserved.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  * 1. Redistributions of source code must retain the above copyright
17  *    notice, this list of conditions, and the following disclaimer,
18  *    without modification.
19  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
20  *    substantially similar to the "NO WARRANTY" disclaimer below
21  *    ("Disclaimer") and any redistribution must be conditioned upon
22  *    including a substantially similar Disclaimer requirement for further
23  *    binary redistribution.
24  * 3. Neither the names of the above-listed copyright holders nor the names
25  *    of any contributors may be used to endorse or promote products derived
26  *    from this software without specific prior written permission.
27  *
28  * Alternatively, this software may be distributed under the terms of the
29  * GNU General Public License ("GPL") version 2 as published by the Free
30  * Software Foundation.
31  *
32  * NO WARRANTY
33  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
34  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
35  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
36  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
37  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
38  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
39  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
42  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
43  * POSSIBILITY OF SUCH DAMAGES.
44  */
45
46 #include <acpi/acpi.h>
47 #include "accommon.h"
48 #include "acinterp.h"
49 #include "amlcode.h"
50
51 #define _COMPONENT          ACPI_EXECUTER
52 ACPI_MODULE_NAME("exstoren")
53
54 /*******************************************************************************
55  *
56  * FUNCTION:    acpi_ex_resolve_object
57  *
58  * PARAMETERS:  source_desc_ptr     - Pointer to the source object
59  *              target_type         - Current type of the target
60  *              walk_state          - Current walk state
61  *
62  * RETURN:      Status, resolved object in source_desc_ptr.
63  *
64  * DESCRIPTION: Resolve an object.  If the object is a reference, dereference
65  *              it and return the actual object in the source_desc_ptr.
66  *
67  ******************************************************************************/
68 acpi_status
69 acpi_ex_resolve_object(union acpi_operand_object **source_desc_ptr,
70                        acpi_object_type target_type,
71                        struct acpi_walk_state *walk_state)
72 {
73         union acpi_operand_object *source_desc = *source_desc_ptr;
74         acpi_status status = AE_OK;
75
76         ACPI_FUNCTION_TRACE(ex_resolve_object);
77
78         /* Ensure we have a Target that can be stored to */
79
80         switch (target_type) {
81         case ACPI_TYPE_BUFFER_FIELD:
82         case ACPI_TYPE_LOCAL_REGION_FIELD:
83         case ACPI_TYPE_LOCAL_BANK_FIELD:
84         case ACPI_TYPE_LOCAL_INDEX_FIELD:
85                 /*
86                  * These cases all require only Integers or values that
87                  * can be converted to Integers (Strings or Buffers)
88                  */
89
90         case ACPI_TYPE_INTEGER:
91         case ACPI_TYPE_STRING:
92         case ACPI_TYPE_BUFFER:
93
94                 /*
95                  * Stores into a Field/Region or into a Integer/Buffer/String
96                  * are all essentially the same.  This case handles the
97                  * "interchangeable" types Integer, String, and Buffer.
98                  */
99                 if (ACPI_GET_OBJECT_TYPE(source_desc) ==
100                     ACPI_TYPE_LOCAL_REFERENCE) {
101
102                         /* Resolve a reference object first */
103
104                         status =
105                             acpi_ex_resolve_to_value(source_desc_ptr,
106                                                      walk_state);
107                         if (ACPI_FAILURE(status)) {
108                                 break;
109                         }
110                 }
111
112                 /* For copy_object, no further validation necessary */
113
114                 if (walk_state->opcode == AML_COPY_OP) {
115                         break;
116                 }
117
118                 /* Must have a Integer, Buffer, or String */
119
120                 if ((ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_INTEGER) &&
121                     (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_BUFFER) &&
122                     (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_STRING) &&
123                     !((ACPI_GET_OBJECT_TYPE(source_desc) ==
124                        ACPI_TYPE_LOCAL_REFERENCE)
125                       && (source_desc->reference.class ==
126                           ACPI_REFCLASS_TABLE))) {
127
128                         /* Conversion successful but still not a valid type */
129
130                         ACPI_ERROR((AE_INFO,
131                                     "Cannot assign type %s to %s (must be type Int/Str/Buf)",
132                                     acpi_ut_get_object_type_name(source_desc),
133                                     acpi_ut_get_type_name(target_type)));
134                         status = AE_AML_OPERAND_TYPE;
135                 }
136                 break;
137
138         case ACPI_TYPE_LOCAL_ALIAS:
139         case ACPI_TYPE_LOCAL_METHOD_ALIAS:
140
141                 /*
142                  * All aliases should have been resolved earlier, during the
143                  * operand resolution phase.
144                  */
145                 ACPI_ERROR((AE_INFO, "Store into an unresolved Alias object"));
146                 status = AE_AML_INTERNAL;
147                 break;
148
149         case ACPI_TYPE_PACKAGE:
150         default:
151
152                 /*
153                  * All other types than Alias and the various Fields come here,
154                  * including the untyped case - ACPI_TYPE_ANY.
155                  */
156                 break;
157         }
158
159         return_ACPI_STATUS(status);
160 }
161
162 /*******************************************************************************
163  *
164  * FUNCTION:    acpi_ex_store_object_to_object
165  *
166  * PARAMETERS:  source_desc         - Object to store
167  *              dest_desc           - Object to receive a copy of the source
168  *              new_desc            - New object if dest_desc is obsoleted
169  *              walk_state          - Current walk state
170  *
171  * RETURN:      Status
172  *
173  * DESCRIPTION: "Store" an object to another object.  This may include
174  *              converting the source type to the target type (implicit
175  *              conversion), and a copy of the value of the source to
176  *              the target.
177  *
178  *              The Assignment of an object to another (not named) object
179  *              is handled here.
180  *              The Source passed in will replace the current value (if any)
181  *              with the input value.
182  *
183  *              When storing into an object the data is converted to the
184  *              target object type then stored in the object.  This means
185  *              that the target object type (for an initialized target) will
186  *              not be changed by a store operation.
187  *
188  *              This module allows destination types of Number, String,
189  *              Buffer, and Package.
190  *
191  *              Assumes parameters are already validated.  NOTE: source_desc
192  *              resolution (from a reference object) must be performed by
193  *              the caller if necessary.
194  *
195  ******************************************************************************/
196
197 acpi_status
198 acpi_ex_store_object_to_object(union acpi_operand_object *source_desc,
199                                union acpi_operand_object *dest_desc,
200                                union acpi_operand_object **new_desc,
201                                struct acpi_walk_state *walk_state)
202 {
203         union acpi_operand_object *actual_src_desc;
204         acpi_status status = AE_OK;
205
206         ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_object, source_desc);
207
208         actual_src_desc = source_desc;
209         if (!dest_desc) {
210                 /*
211                  * There is no destination object (An uninitialized node or
212                  * package element), so we can simply copy the source object
213                  * creating a new destination object
214                  */
215                 status =
216                     acpi_ut_copy_iobject_to_iobject(actual_src_desc, new_desc,
217                                                     walk_state);
218                 return_ACPI_STATUS(status);
219         }
220
221         if (ACPI_GET_OBJECT_TYPE(source_desc) !=
222             ACPI_GET_OBJECT_TYPE(dest_desc)) {
223                 /*
224                  * The source type does not match the type of the destination.
225                  * Perform the "implicit conversion" of the source to the current type
226                  * of the target as per the ACPI specification.
227                  *
228                  * If no conversion performed, actual_src_desc = source_desc.
229                  * Otherwise, actual_src_desc is a temporary object to hold the
230                  * converted object.
231                  */
232                 status =
233                     acpi_ex_convert_to_target_type(ACPI_GET_OBJECT_TYPE
234                                                    (dest_desc), source_desc,
235                                                    &actual_src_desc,
236                                                    walk_state);
237                 if (ACPI_FAILURE(status)) {
238                         return_ACPI_STATUS(status);
239                 }
240
241                 if (source_desc == actual_src_desc) {
242                         /*
243                          * No conversion was performed. Return the source_desc as the
244                          * new object.
245                          */
246                         *new_desc = source_desc;
247                         return_ACPI_STATUS(AE_OK);
248                 }
249         }
250
251         /*
252          * We now have two objects of identical types, and we can perform a
253          * copy of the *value* of the source object.
254          */
255         switch (ACPI_GET_OBJECT_TYPE(dest_desc)) {
256         case ACPI_TYPE_INTEGER:
257
258                 dest_desc->integer.value = actual_src_desc->integer.value;
259
260                 /* Truncate value if we are executing from a 32-bit ACPI table */
261
262                 acpi_ex_truncate_for32bit_table(dest_desc);
263                 break;
264
265         case ACPI_TYPE_STRING:
266
267                 status =
268                     acpi_ex_store_string_to_string(actual_src_desc, dest_desc);
269                 break;
270
271         case ACPI_TYPE_BUFFER:
272
273                 status =
274                     acpi_ex_store_buffer_to_buffer(actual_src_desc, dest_desc);
275                 break;
276
277         case ACPI_TYPE_PACKAGE:
278
279                 status =
280                     acpi_ut_copy_iobject_to_iobject(actual_src_desc, &dest_desc,
281                                                     walk_state);
282                 break;
283
284         default:
285                 /*
286                  * All other types come here.
287                  */
288                 ACPI_WARNING((AE_INFO, "Store into type %s not implemented",
289                               acpi_ut_get_object_type_name(dest_desc)));
290
291                 status = AE_NOT_IMPLEMENTED;
292                 break;
293         }
294
295         if (actual_src_desc != source_desc) {
296
297                 /* Delete the intermediate (temporary) source object */
298
299                 acpi_ut_remove_reference(actual_src_desc);
300         }
301
302         *new_desc = dest_desc;
303         return_ACPI_STATUS(status);
304 }