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Merge branch 'akpm'
[linux-2.6/next.git] / drivers / acpi / acpica / exstore.c
blobc0c8842dd344b088649c3bc041d2df787f645ba5
1 /******************************************************************************
2 *
3 * Module Name: exstore - AML Interpreter object store support
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2011, 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 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acdispat.h"
47 #include "acinterp.h"
48 #include "amlcode.h"
49 #include "acnamesp.h"
50
51 #define _COMPONENT ACPI_EXECUTER
52 ACPI_MODULE_NAME("exstore")
53
54 /* Local prototypes */
55 static acpi_status
56 acpi_ex_store_object_to_index(union acpi_operand_object *val_desc,
57 union acpi_operand_object *dest_desc,
58 struct acpi_walk_state *walk_state);
59
60 /*******************************************************************************
61 *
62 * FUNCTION: acpi_ex_store
63 *
64 * PARAMETERS: *source_desc - Value to be stored
65 * *dest_desc - Where to store it. Must be an NS node
66 * or a union acpi_operand_object of type
67 * Reference;
68 * walk_state - Current walk state
69 *
70 * RETURN: Status
71 *
72 * DESCRIPTION: Store the value described by source_desc into the location
73 * described by dest_desc. Called by various interpreter
74 * functions to store the result of an operation into
75 * the destination operand -- not just simply the actual "Store"
76 * ASL operator.
77 *
78 ******************************************************************************/
79
80 acpi_status
81 acpi_ex_store(union acpi_operand_object *source_desc,
82 union acpi_operand_object *dest_desc,
83 struct acpi_walk_state *walk_state)
84 {
85 acpi_status status = AE_OK;
86 union acpi_operand_object *ref_desc = dest_desc;
87
88 ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);
89
90 /* Validate parameters */
91
92 if (!source_desc || !dest_desc) {
93 ACPI_ERROR((AE_INFO, "Null parameter"));
94 return_ACPI_STATUS(AE_AML_NO_OPERAND);
95 }
96
97 /* dest_desc can be either a namespace node or an ACPI object */
98
99 if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
100 /*
101 * Dest is a namespace node,
102 * Storing an object into a Named node.
103 */
104 status = acpi_ex_store_object_to_node(source_desc,
105 (struct
106 acpi_namespace_node *)
107 dest_desc, walk_state,
108 ACPI_IMPLICIT_CONVERSION);
109
110 return_ACPI_STATUS(status);
111 }
112
113 /* Destination object must be a Reference or a Constant object */
114
115 switch (dest_desc->common.type) {
116 case ACPI_TYPE_LOCAL_REFERENCE:
117 break;
118
119 case ACPI_TYPE_INTEGER:
120
121 /* Allow stores to Constants -- a Noop as per ACPI spec */
122
123 if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
124 return_ACPI_STATUS(AE_OK);
125 }
126
127 /*lint -fallthrough */
128
129 default:
130
131 /* Destination is not a Reference object */
132
133 ACPI_ERROR((AE_INFO,
134 "Target is not a Reference or Constant object - %s [%p]",
135 acpi_ut_get_object_type_name(dest_desc),
136 dest_desc));
137
138 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
139 }
140
141 /*
142 * Examine the Reference class. These cases are handled:
143 *
144 * 1) Store to Name (Change the object associated with a name)
145 * 2) Store to an indexed area of a Buffer or Package
146 * 3) Store to a Method Local or Arg
147 * 4) Store to the debug object
148 */
149 switch (ref_desc->reference.class) {
150 case ACPI_REFCLASS_REFOF:
151
152 /* Storing an object into a Name "container" */
153
154 status = acpi_ex_store_object_to_node(source_desc,
155 ref_desc->reference.
156 object, walk_state,
157 ACPI_IMPLICIT_CONVERSION);
158 break;
159
160 case ACPI_REFCLASS_INDEX:
161
162 /* Storing to an Index (pointer into a packager or buffer) */
163
164 status =
165 acpi_ex_store_object_to_index(source_desc, ref_desc,
166 walk_state);
167 break;
168
169 case ACPI_REFCLASS_LOCAL:
170 case ACPI_REFCLASS_ARG:
171
172 /* Store to a method local/arg */
173
174 status =
175 acpi_ds_store_object_to_local(ref_desc->reference.class,
176 ref_desc->reference.value,
177 source_desc, walk_state);
178 break;
179
180 case ACPI_REFCLASS_DEBUG:
181
182 /*
183 * Storing to the Debug object causes the value stored to be
184 * displayed and otherwise has no effect -- see ACPI Specification
185 */
186 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
187 "**** Write to Debug Object: Object %p %s ****:\n\n",
188 source_desc,
189 acpi_ut_get_object_type_name(source_desc)));
190
191 ACPI_DEBUG_OBJECT(source_desc, 0, 0);
192 break;
193
194 default:
195
196 ACPI_ERROR((AE_INFO, "Unknown Reference Class 0x%2.2X",
197 ref_desc->reference.class));
198 ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_INFO);
199
200 status = AE_AML_INTERNAL;
201 break;
202 }
203
204 return_ACPI_STATUS(status);
205 }
206
207 /*******************************************************************************
208 *
209 * FUNCTION: acpi_ex_store_object_to_index
210 *
211 * PARAMETERS: *source_desc - Value to be stored
212 * *dest_desc - Named object to receive the value
213 * walk_state - Current walk state
214 *
215 * RETURN: Status
216 *
217 * DESCRIPTION: Store the object to indexed Buffer or Package element
218 *
219 ******************************************************************************/
220
221 static acpi_status
222 acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
223 union acpi_operand_object *index_desc,
224 struct acpi_walk_state *walk_state)
225 {
226 acpi_status status = AE_OK;
227 union acpi_operand_object *obj_desc;
228 union acpi_operand_object *new_desc;
229 u8 value = 0;
230 u32 i;
231
232 ACPI_FUNCTION_TRACE(ex_store_object_to_index);
233
234 /*
235 * Destination must be a reference pointer, and
236 * must point to either a buffer or a package
237 */
238 switch (index_desc->reference.target_type) {
239 case ACPI_TYPE_PACKAGE:
240 /*
241 * Storing to a package element. Copy the object and replace
242 * any existing object with the new object. No implicit
243 * conversion is performed.
244 *
245 * The object at *(index_desc->Reference.Where) is the
246 * element within the package that is to be modified.
247 * The parent package object is at index_desc->Reference.Object
248 */
249 obj_desc = *(index_desc->reference.where);
250
251 if (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE &&
252 source_desc->reference.class == ACPI_REFCLASS_TABLE) {
253
254 /* This is a DDBHandle, just add a reference to it */
255
256 acpi_ut_add_reference(source_desc);
257 new_desc = source_desc;
258 } else {
259 /* Normal object, copy it */
260
261 status =
262 acpi_ut_copy_iobject_to_iobject(source_desc,
263 &new_desc,
264 walk_state);
265 if (ACPI_FAILURE(status)) {
266 return_ACPI_STATUS(status);
267 }
268 }
269
270 if (obj_desc) {
271
272 /* Decrement reference count by the ref count of the parent package */
273
274 for (i = 0; i < ((union acpi_operand_object *)
275 index_desc->reference.object)->common.
276 reference_count; i++) {
277 acpi_ut_remove_reference(obj_desc);
278 }
279 }
280
281 *(index_desc->reference.where) = new_desc;
282
283 /* Increment ref count by the ref count of the parent package-1 */
284
285 for (i = 1; i < ((union acpi_operand_object *)
286 index_desc->reference.object)->common.
287 reference_count; i++) {
288 acpi_ut_add_reference(new_desc);
289 }
290
291 break;
292
293 case ACPI_TYPE_BUFFER_FIELD:
294
295 /*
296 * Store into a Buffer or String (not actually a real buffer_field)
297 * at a location defined by an Index.
298 *
299 * The first 8-bit element of the source object is written to the
300 * 8-bit Buffer location defined by the Index destination object,
301 * according to the ACPI 2.0 specification.
302 */
303
304 /*
305 * Make sure the target is a Buffer or String. An error should
306 * not happen here, since the reference_object was constructed
307 * by the INDEX_OP code.
308 */
309 obj_desc = index_desc->reference.object;
310 if ((obj_desc->common.type != ACPI_TYPE_BUFFER) &&
311 (obj_desc->common.type != ACPI_TYPE_STRING)) {
312 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
313 }
314
315 /*
316 * The assignment of the individual elements will be slightly
317 * different for each source type.
318 */
319 switch (source_desc->common.type) {
320 case ACPI_TYPE_INTEGER:
321
322 /* Use the least-significant byte of the integer */
323
324 value = (u8) (source_desc->integer.value);
325 break;
326
327 case ACPI_TYPE_BUFFER:
328 case ACPI_TYPE_STRING:
329
330 /* Note: Takes advantage of common string/buffer fields */
331
332 value = source_desc->buffer.pointer[0];
333 break;
334
335 default:
336
337 /* All other types are invalid */
338
339 ACPI_ERROR((AE_INFO,
340 "Source must be Integer/Buffer/String type, not %s",
341 acpi_ut_get_object_type_name(source_desc)));
342 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
343 }
344
345 /* Store the source value into the target buffer byte */
346
347 obj_desc->buffer.pointer[index_desc->reference.value] = value;
348 break;
349
350 default:
351 ACPI_ERROR((AE_INFO, "Target is not a Package or BufferField"));
352 status = AE_AML_OPERAND_TYPE;
353 break;
354 }
355
356 return_ACPI_STATUS(status);
357 }
358
359 /*******************************************************************************
360 *
361 * FUNCTION: acpi_ex_store_object_to_node
362 *
363 * PARAMETERS: source_desc - Value to be stored
364 * Node - Named object to receive the value
365 * walk_state - Current walk state
366 * implicit_conversion - Perform implicit conversion (yes/no)
367 *
368 * RETURN: Status
369 *
370 * DESCRIPTION: Store the object to the named object.
371 *
372 * The Assignment of an object to a named object is handled here
373 * The value passed in will replace the current value (if any)
374 * with the input value.
375 *
376 * When storing into an object the data is converted to the
377 * target object type then stored in the object. This means
378 * that the target object type (for an initialized target) will
379 * not be changed by a store operation.
380 *
381 * Assumes parameters are already validated.
382 *
383 ******************************************************************************/
384
385 acpi_status
386 acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
387 struct acpi_namespace_node *node,
388 struct acpi_walk_state *walk_state,
389 u8 implicit_conversion)
390 {
391 acpi_status status = AE_OK;
392 union acpi_operand_object *target_desc;
393 union acpi_operand_object *new_desc;
394 acpi_object_type target_type;
395
396 ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
397
398 /* Get current type of the node, and object attached to Node */
399
400 target_type = acpi_ns_get_type(node);
401 target_desc = acpi_ns_get_attached_object(node);
402
403 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p(%s) into node %p(%s)\n",
404 source_desc,
405 acpi_ut_get_object_type_name(source_desc), node,
406 acpi_ut_get_type_name(target_type)));
407
408 /*
409 * Resolve the source object to an actual value
410 * (If it is a reference object)
411 */
412 status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
413 if (ACPI_FAILURE(status)) {
414 return_ACPI_STATUS(status);
415 }
416
417 /* If no implicit conversion, drop into the default case below */
418
419 if ((!implicit_conversion) ||
420 ((walk_state->opcode == AML_COPY_OP) &&
421 (target_type != ACPI_TYPE_LOCAL_REGION_FIELD) &&
422 (target_type != ACPI_TYPE_LOCAL_BANK_FIELD) &&
423 (target_type != ACPI_TYPE_LOCAL_INDEX_FIELD))) {
424 /*
425 * Force execution of default (no implicit conversion). Note:
426 * copy_object does not perform an implicit conversion, as per the ACPI
427 * spec -- except in case of region/bank/index fields -- because these
428 * objects must retain their original type permanently.
429 */
430 target_type = ACPI_TYPE_ANY;
431 }
432
433 /* Do the actual store operation */
434
435 switch (target_type) {
436 case ACPI_TYPE_BUFFER_FIELD:
437 case ACPI_TYPE_LOCAL_REGION_FIELD:
438 case ACPI_TYPE_LOCAL_BANK_FIELD:
439 case ACPI_TYPE_LOCAL_INDEX_FIELD:
440
441 /* For fields, copy the source data to the target field. */
442
443 status = acpi_ex_write_data_to_field(source_desc, target_desc,
444 &walk_state->result_obj);
445 break;
446
447 case ACPI_TYPE_INTEGER:
448 case ACPI_TYPE_STRING:
449 case ACPI_TYPE_BUFFER:
450
451 /*
452 * These target types are all of type Integer/String/Buffer, and
453 * therefore support implicit conversion before the store.
454 *
455 * Copy and/or convert the source object to a new target object
456 */
457 status =
458 acpi_ex_store_object_to_object(source_desc, target_desc,
459 &new_desc, walk_state);
460 if (ACPI_FAILURE(status)) {
461 return_ACPI_STATUS(status);
462 }
463
464 if (new_desc != target_desc) {
465 /*
466 * Store the new new_desc as the new value of the Name, and set
467 * the Name's type to that of the value being stored in it.
468 * source_desc reference count is incremented by attach_object.
469 *
470 * Note: This may change the type of the node if an explicit store
471 * has been performed such that the node/object type has been
472 * changed.
473 */
474 status =
475 acpi_ns_attach_object(node, new_desc,
476 new_desc->common.type);
477
478 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
479 "Store %s into %s via Convert/Attach\n",
480 acpi_ut_get_object_type_name
481 (source_desc),
482 acpi_ut_get_object_type_name
483 (new_desc)));
484 }
485 break;
486
487 default:
488
489 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
490 "Storing %s (%p) directly into node (%p) with no implicit conversion\n",
491 acpi_ut_get_object_type_name(source_desc),
492 source_desc, node));
493
494 /* No conversions for all other types. Just attach the source object */
495
496 status = acpi_ns_attach_object(node, source_desc,
497 source_desc->common.type);
498 break;
499 }
500
501 return_ACPI_STATUS(status);
502 }
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