Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / 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 - 2012, 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 (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
100
101                         /* Resolve a reference object first */
102
103                         status =
104                             acpi_ex_resolve_to_value(source_desc_ptr,
105                                                      walk_state);
106                         if (ACPI_FAILURE(status)) {
107                                 break;
108                         }
109                 }
110
111                 /* For copy_object, no further validation necessary */
112
113                 if (walk_state->opcode == AML_COPY_OP) {
114                         break;
115                 }
116
117                 /* Must have a Integer, Buffer, or String */
118
119                 if ((source_desc->common.type != ACPI_TYPE_INTEGER) &&
120                     (source_desc->common.type != ACPI_TYPE_BUFFER) &&
121                     (source_desc->common.type != ACPI_TYPE_STRING) &&
122                     !((source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&
123                       (source_desc->reference.class == ACPI_REFCLASS_TABLE))) {
124
125                         /* Conversion successful but still not a valid type */
126
127                         ACPI_ERROR((AE_INFO,
128                                     "Cannot assign type %s to %s (must be type Int/Str/Buf)",
129                                     acpi_ut_get_object_type_name(source_desc),
130                                     acpi_ut_get_type_name(target_type)));
131                         status = AE_AML_OPERAND_TYPE;
132                 }
133                 break;
134
135         case ACPI_TYPE_LOCAL_ALIAS:
136         case ACPI_TYPE_LOCAL_METHOD_ALIAS:
137
138                 /*
139                  * All aliases should have been resolved earlier, during the
140                  * operand resolution phase.
141                  */
142                 ACPI_ERROR((AE_INFO, "Store into an unresolved Alias object"));
143                 status = AE_AML_INTERNAL;
144                 break;
145
146         case ACPI_TYPE_PACKAGE:
147         default:
148
149                 /*
150                  * All other types than Alias and the various Fields come here,
151                  * including the untyped case - ACPI_TYPE_ANY.
152                  */
153                 break;
154         }
155
156         return_ACPI_STATUS(status);
157 }
158
159 /*******************************************************************************
160  *
161  * FUNCTION:    acpi_ex_store_object_to_object
162  *
163  * PARAMETERS:  source_desc         - Object to store
164  *              dest_desc           - Object to receive a copy of the source
165  *              new_desc            - New object if dest_desc is obsoleted
166  *              walk_state          - Current walk state
167  *
168  * RETURN:      Status
169  *
170  * DESCRIPTION: "Store" an object to another object.  This may include
171  *              converting the source type to the target type (implicit
172  *              conversion), and a copy of the value of the source to
173  *              the target.
174  *
175  *              The Assignment of an object to another (not named) object
176  *              is handled here.
177  *              The Source passed in will replace the current value (if any)
178  *              with the input value.
179  *
180  *              When storing into an object the data is converted to the
181  *              target object type then stored in the object.  This means
182  *              that the target object type (for an initialized target) will
183  *              not be changed by a store operation.
184  *
185  *              This module allows destination types of Number, String,
186  *              Buffer, and Package.
187  *
188  *              Assumes parameters are already validated.  NOTE: source_desc
189  *              resolution (from a reference object) must be performed by
190  *              the caller if necessary.
191  *
192  ******************************************************************************/
193
194 acpi_status
195 acpi_ex_store_object_to_object(union acpi_operand_object *source_desc,
196                                union acpi_operand_object *dest_desc,
197                                union acpi_operand_object **new_desc,
198                                struct acpi_walk_state *walk_state)
199 {
200         union acpi_operand_object *actual_src_desc;
201         acpi_status status = AE_OK;
202
203         ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_object, source_desc);
204
205         actual_src_desc = source_desc;
206         if (!dest_desc) {
207                 /*
208                  * There is no destination object (An uninitialized node or
209                  * package element), so we can simply copy the source object
210                  * creating a new destination object
211                  */
212                 status =
213                     acpi_ut_copy_iobject_to_iobject(actual_src_desc, new_desc,
214                                                     walk_state);
215                 return_ACPI_STATUS(status);
216         }
217
218         if (source_desc->common.type != dest_desc->common.type) {
219                 /*
220                  * The source type does not match the type of the destination.
221                  * Perform the "implicit conversion" of the source to the current type
222                  * of the target as per the ACPI specification.
223                  *
224                  * If no conversion performed, actual_src_desc = source_desc.
225                  * Otherwise, actual_src_desc is a temporary object to hold the
226                  * converted object.
227                  */
228                 status = acpi_ex_convert_to_target_type(dest_desc->common.type,
229                                                         source_desc,
230                                                         &actual_src_desc,
231                                                         walk_state);
232                 if (ACPI_FAILURE(status)) {
233                         return_ACPI_STATUS(status);
234                 }
235
236                 if (source_desc == actual_src_desc) {
237                         /*
238                          * No conversion was performed. Return the source_desc as the
239                          * new object.
240                          */
241                         *new_desc = source_desc;
242                         return_ACPI_STATUS(AE_OK);
243                 }
244         }
245
246         /*
247          * We now have two objects of identical types, and we can perform a
248          * copy of the *value* of the source object.
249          */
250         switch (dest_desc->common.type) {
251         case ACPI_TYPE_INTEGER:
252
253                 dest_desc->integer.value = actual_src_desc->integer.value;
254
255                 /* Truncate value if we are executing from a 32-bit ACPI table */
256
257                 acpi_ex_truncate_for32bit_table(dest_desc);
258                 break;
259
260         case ACPI_TYPE_STRING:
261
262                 status =
263                     acpi_ex_store_string_to_string(actual_src_desc, dest_desc);
264                 break;
265
266         case ACPI_TYPE_BUFFER:
267
268                 status =
269                     acpi_ex_store_buffer_to_buffer(actual_src_desc, dest_desc);
270                 break;
271
272         case ACPI_TYPE_PACKAGE:
273
274                 status =
275                     acpi_ut_copy_iobject_to_iobject(actual_src_desc, &dest_desc,
276                                                     walk_state);
277                 break;
278
279         default:
280                 /*
281                  * All other types come here.
282                  */
283                 ACPI_WARNING((AE_INFO, "Store into type %s not implemented",
284                               acpi_ut_get_object_type_name(dest_desc)));
285
286                 status = AE_NOT_IMPLEMENTED;
287                 break;
288         }
289
290         if (actual_src_desc != source_desc) {
291
292                 /* Delete the intermediate (temporary) source object */
293
294                 acpi_ut_remove_reference(actual_src_desc);
295         }
296
297         *new_desc = dest_desc;
298         return_ACPI_STATUS(status);
299 }