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initial commit with v2.6.9
[linux-2.6.9-moxart.git] / drivers / acpi / executer / exstore.c
blob25464f751408eae6f81ee6e39d06c96ac227b003
1
2 /******************************************************************************
3 *
4 * Module Name: exstore - AML Interpreter object store support
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2004, R. Byron Moore
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
46 #include <acpi/acpi.h>
47 #include <acpi/acdispat.h>
48 #include <acpi/acinterp.h>
49 #include <acpi/amlcode.h>
50 #include <acpi/acnamesp.h>
51
52
53 #define _COMPONENT ACPI_EXECUTER
54 ACPI_MODULE_NAME ("exstore")
55
56
57 /*******************************************************************************
58 *
59 * FUNCTION: acpi_ex_store
60 *
61 * PARAMETERS: *source_desc - Value to be stored
62 * *dest_desc - Where to store it. Must be an NS node
63 * or an union acpi_operand_object of type
64 * Reference;
65 * walk_state - Current walk state
66 *
67 * RETURN: Status
68 *
69 * DESCRIPTION: Store the value described by source_desc into the location
70 * described by dest_desc. Called by various interpreter
71 * functions to store the result of an operation into
72 * the destination operand -- not just simply the actual "Store"
73 * ASL operator.
74 *
75 ******************************************************************************/
76
77 acpi_status
78 acpi_ex_store (
79 union acpi_operand_object *source_desc,
80 union acpi_operand_object *dest_desc,
81 struct acpi_walk_state *walk_state)
82 {
83 acpi_status status = AE_OK;
84 union acpi_operand_object *ref_desc = dest_desc;
85
86
87 ACPI_FUNCTION_TRACE_PTR ("ex_store", dest_desc);
88
89
90 /* Validate parameters */
91
92 if (!source_desc || !dest_desc) {
93 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null parameter\n"));
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 acpi_namespace_node *) dest_desc, walk_state,
106 ACPI_IMPLICIT_CONVERSION);
107
108 return_ACPI_STATUS (status);
109 }
110
111 /* Destination object must be a Reference or a Constant object */
112
113 switch (ACPI_GET_OBJECT_TYPE (dest_desc)) {
114 case ACPI_TYPE_LOCAL_REFERENCE:
115 break;
116
117 case ACPI_TYPE_INTEGER:
118
119 /* Allow stores to Constants -- a Noop as per ACPI spec */
120
121 if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
122 return_ACPI_STATUS (AE_OK);
123 }
124
125 /*lint -fallthrough */
126
127 default:
128
129 /* Destination is not a Reference object */
130
131 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
132 "Destination is not a Reference or Constant object [%p]\n", dest_desc));
133
134 ACPI_DUMP_STACK_ENTRY (source_desc);
135 ACPI_DUMP_STACK_ENTRY (dest_desc);
136 ACPI_DUMP_OPERANDS (&dest_desc, ACPI_IMODE_EXECUTE, "ex_store",
137 2, "Target is not a Reference or Constant object");
138
139 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
140 }
141
142 /*
143 * Examine the Reference opcode. These cases are handled:
144 *
145 * 1) Store to Name (Change the object associated with a name)
146 * 2) Store to an indexed area of a Buffer or Package
147 * 3) Store to a Method Local or Arg
148 * 4) Store to the debug object
149 */
150 switch (ref_desc->reference.opcode) {
151 case AML_NAME_OP:
152 case AML_REF_OF_OP:
153
154 /* Storing an object into a Name "container" */
155
156 status = acpi_ex_store_object_to_node (source_desc, ref_desc->reference.object,
157 walk_state, ACPI_IMPLICIT_CONVERSION);
158 break;
159
160
161 case AML_INDEX_OP:
162
163 /* Storing to an Index (pointer into a packager or buffer) */
164
165 status = acpi_ex_store_object_to_index (source_desc, ref_desc, walk_state);
166 break;
167
168
169 case AML_LOCAL_OP:
170 case AML_ARG_OP:
171
172 /* Store to a method local/arg */
173
174 status = acpi_ds_store_object_to_local (ref_desc->reference.opcode,
175 ref_desc->reference.offset, source_desc, walk_state);
176 break;
177
178
179 case AML_DEBUG_OP:
180
181 /*
182 * Storing to the Debug object causes the value stored to be
183 * displayed and otherwise has no effect -- see ACPI Specification
184 */
185 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "**** Write to Debug Object: ****:\n\n"));
186
187 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_DEBUG_OBJECT, "[ACPI Debug] %s: ",
188 acpi_ut_get_object_type_name (source_desc)));
189
190 switch (ACPI_GET_OBJECT_TYPE (source_desc)) {
191 case ACPI_TYPE_INTEGER:
192
193 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_DEBUG_OBJECT, "0x%8.8X%8.8X\n",
194 ACPI_FORMAT_UINT64 (source_desc->integer.value)));
195 break;
196
197
198 case ACPI_TYPE_BUFFER:
199
200 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_DEBUG_OBJECT, "Length 0x%.2X",
201 (u32) source_desc->buffer.length));
202 ACPI_DUMP_BUFFER (source_desc->buffer.pointer,
203 (source_desc->buffer.length < 32) ? source_desc->buffer.length : 32);
204 break;
205
206
207 case ACPI_TYPE_STRING:
208
209 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_DEBUG_OBJECT, "Length 0x%.2X, \"%s\"\n",
210 source_desc->string.length, source_desc->string.pointer));
211 break;
212
213
214 case ACPI_TYPE_PACKAGE:
215
216 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_DEBUG_OBJECT, "Size 0x%.2X Elements Ptr - %p\n",
217 source_desc->package.count, source_desc->package.elements));
218 break;
219
220
221 default:
222
223 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_DEBUG_OBJECT, "%p\n",
224 source_desc));
225 break;
226 }
227
228 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC, "\n"));
229 break;
230
231
232 default:
233
234 ACPI_REPORT_ERROR (("ex_store: Unknown Reference opcode %X\n",
235 ref_desc->reference.opcode));
236 ACPI_DUMP_ENTRY (ref_desc, ACPI_LV_ERROR);
237
238 status = AE_AML_INTERNAL;
239 break;
240 }
241
242 return_ACPI_STATUS (status);
243 }
244
245
246 /*******************************************************************************
247 *
248 * FUNCTION: acpi_ex_store_object_to_index
249 *
250 * PARAMETERS: *source_desc - Value to be stored
251 * *dest_desc - Named object to receive the value
252 * walk_state - Current walk state
253 *
254 * RETURN: Status
255 *
256 * DESCRIPTION: Store the object to indexed Buffer or Package element
257 *
258 ******************************************************************************/
259
260 acpi_status
261 acpi_ex_store_object_to_index (
262 union acpi_operand_object *source_desc,
263 union acpi_operand_object *index_desc,
264 struct acpi_walk_state *walk_state)
265 {
266 acpi_status status = AE_OK;
267 union acpi_operand_object *obj_desc;
268 union acpi_operand_object *new_desc;
269 u8 value = 0;
270 u32 i;
271
272
273 ACPI_FUNCTION_TRACE ("ex_store_object_to_index");
274
275
276 /*
277 * Destination must be a reference pointer, and
278 * must point to either a buffer or a package
279 */
280 switch (index_desc->reference.target_type) {
281 case ACPI_TYPE_PACKAGE:
282 /*
283 * Storing to a package element is not simple. The source must be
284 * evaluated and converted to the type of the destination and then the
285 * source is copied into the destination - we can't just point to the
286 * source object.
287 */
288 /*
289 * The object at *(index_desc->Reference.Where) is the
290 * element within the package that is to be modified.
291 * The parent package object is at index_desc->Reference.Object
292 */
293 obj_desc = *(index_desc->reference.where);
294
295 /* Do the conversion/store */
296
297 status = acpi_ex_store_object_to_object (source_desc, obj_desc, &new_desc,
298 walk_state);
299 if (ACPI_FAILURE (status)) {
300 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
301 "Could not store object to indexed package element\n"));
302 return_ACPI_STATUS (status);
303 }
304
305 /*
306 * If a new object was created, we must install it as the new
307 * package element
308 */
309 if (new_desc != obj_desc) {
310 acpi_ut_remove_reference (obj_desc);
311 *(index_desc->reference.where) = new_desc;
312
313 /* If same as the original source, add a reference */
314
315 if (new_desc == source_desc) {
316 acpi_ut_add_reference (new_desc);
317 }
318
319 /* Increment reference count by the ref count of the parent package -1 */
320
321 for (i = 1; i < ((union acpi_operand_object *) index_desc->reference.object)->common.reference_count; i++) {
322 acpi_ut_add_reference (new_desc);
323 }
324 }
325 break;
326
327
328 case ACPI_TYPE_BUFFER_FIELD:
329
330 /*
331 * Store into a Buffer (not actually a real buffer_field) at a
332 * location defined by an Index.
333 *
334 * The first 8-bit element of the source object is written to the
335 * 8-bit Buffer location defined by the Index destination object,
336 * according to the ACPI 2.0 specification.
337 */
338
339 /*
340 * Make sure the target is a Buffer
341 */
342 obj_desc = index_desc->reference.object;
343 if (ACPI_GET_OBJECT_TYPE (obj_desc) != ACPI_TYPE_BUFFER) {
344 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
345 }
346
347 /*
348 * The assignment of the individual elements will be slightly
349 * different for each source type.
350 */
351 switch (ACPI_GET_OBJECT_TYPE (source_desc)) {
352 case ACPI_TYPE_INTEGER:
353
354 /* Use the least-significant byte of the integer */
355
356 value = (u8) (source_desc->integer.value);
357 break;
358
359 case ACPI_TYPE_BUFFER:
360
361 value = source_desc->buffer.pointer[0];
362 break;
363
364 case ACPI_TYPE_STRING:
365
366 value = (u8) source_desc->string.pointer[0];
367 break;
368
369 default:
370
371 /* All other types are invalid */
372
373 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
374 "Source must be Integer/Buffer/String type, not %s\n",
375 acpi_ut_get_object_type_name (source_desc)));
376 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
377 }
378
379 /* Store the source value into the target buffer byte */
380
381 obj_desc->buffer.pointer[index_desc->reference.offset] = value;
382 break;
383
384
385 default:
386 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
387 "Target is not a Package or buffer_field\n"));
388 status = AE_AML_OPERAND_TYPE;
389 break;
390 }
391
392 return_ACPI_STATUS (status);
393 }
394
395
396 /*******************************************************************************
397 *
398 * FUNCTION: acpi_ex_store_object_to_node
399 *
400 * PARAMETERS: source_desc - Value to be stored
401 * Node - Named object to receive the value
402 * walk_state - Current walk state
403 * implicit_conversion - Perform implicit conversion (yes/no)
404 *
405 * RETURN: Status
406 *
407 * DESCRIPTION: Store the object to the named object.
408 *
409 * The Assignment of an object to a named object is handled here
410 * The value passed in will replace the current value (if any)
411 * with the input value.
412 *
413 * When storing into an object the data is converted to the
414 * target object type then stored in the object. This means
415 * that the target object type (for an initialized target) will
416 * not be changed by a store operation.
417 *
418 * Assumes parameters are already validated.
419 *
420 ******************************************************************************/
421
422 acpi_status
423 acpi_ex_store_object_to_node (
424 union acpi_operand_object *source_desc,
425 struct acpi_namespace_node *node,
426 struct acpi_walk_state *walk_state,
427 u8 implicit_conversion)
428 {
429 acpi_status status = AE_OK;
430 union acpi_operand_object *target_desc;
431 union acpi_operand_object *new_desc;
432 acpi_object_type target_type;
433
434
435 ACPI_FUNCTION_TRACE_PTR ("ex_store_object_to_node", source_desc);
436
437
438 /*
439 * Get current type of the node, and object attached to Node
440 */
441 target_type = acpi_ns_get_type (node);
442 target_desc = acpi_ns_get_attached_object (node);
443
444 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Storing %p(%s) into node %p(%s)\n",
445 source_desc, acpi_ut_get_object_type_name (source_desc),
446 node, acpi_ut_get_type_name (target_type)));
447
448 /*
449 * Resolve the source object to an actual value
450 * (If it is a reference object)
451 */
452 status = acpi_ex_resolve_object (&source_desc, target_type, walk_state);
453 if (ACPI_FAILURE (status)) {
454 return_ACPI_STATUS (status);
455 }
456
457 /* If no implicit conversion, drop into the default case below */
458
459 if (!implicit_conversion) {
460 /* Force execution of default (no implicit conversion) */
461
462 target_type = ACPI_TYPE_ANY;
463 }
464
465 /*
466 * Do the actual store operation
467 */
468 switch (target_type) {
469 case ACPI_TYPE_BUFFER_FIELD:
470 case ACPI_TYPE_LOCAL_REGION_FIELD:
471 case ACPI_TYPE_LOCAL_BANK_FIELD:
472 case ACPI_TYPE_LOCAL_INDEX_FIELD:
473
474 /*
475 * For fields, copy the source data to the target field.
476 */
477 status = acpi_ex_write_data_to_field (source_desc, target_desc, &walk_state->result_obj);
478 break;
479
480
481 case ACPI_TYPE_INTEGER:
482 case ACPI_TYPE_STRING:
483 case ACPI_TYPE_BUFFER:
484
485 /*
486 * These target types are all of type Integer/String/Buffer, and
487 * therefore support implicit conversion before the store.
488 *
489 * Copy and/or convert the source object to a new target object
490 */
491 status = acpi_ex_store_object_to_object (source_desc, target_desc, &new_desc, walk_state);
492 if (ACPI_FAILURE (status)) {
493 return_ACPI_STATUS (status);
494 }
495
496 if (new_desc != target_desc) {
497 /*
498 * Store the new new_desc as the new value of the Name, and set
499 * the Name's type to that of the value being stored in it.
500 * source_desc reference count is incremented by attach_object.
501 *
502 * Note: This may change the type of the node if an explicit store
503 * has been performed such that the node/object type has been
504 * changed.
505 */
506 status = acpi_ns_attach_object (node, new_desc, new_desc->common.type);
507
508 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
509 "Store %s into %s via Convert/Attach\n",
510 acpi_ut_get_object_type_name (source_desc),
511 acpi_ut_get_object_type_name (new_desc)));
512 }
513 break;
514
515
516 default:
517
518 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
519 "Storing %s (%p) directly into node (%p), no implicit conversion\n",
520 acpi_ut_get_object_type_name (source_desc), source_desc, node));
521
522 /* No conversions for all other types. Just attach the source object */
523
524 status = acpi_ns_attach_object (node, source_desc, ACPI_GET_OBJECT_TYPE (source_desc));
525 break;
526 }
527
528 return_ACPI_STATUS (status);
529 }
530
531
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