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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: exstore - AML Interpreter object store support
5 *
6 * Copyright (C) 2000 - 2023, Intel Corp.
7 *
8 *****************************************************************************/
9
10#include <acpi/acpi.h>
11#include "accommon.h"
12#include "acdispat.h"
13#include "acinterp.h"
14#include "amlcode.h"
15#include "acnamesp.h"
16
17#define _COMPONENT ACPI_EXECUTER
18ACPI_MODULE_NAME("exstore")
19
20/* Local prototypes */
21static acpi_status
22acpi_ex_store_object_to_index(union acpi_operand_object *val_desc,
23 union acpi_operand_object *dest_desc,
24 struct acpi_walk_state *walk_state);
25
26static acpi_status
27acpi_ex_store_direct_to_node(union acpi_operand_object *source_desc,
28 struct acpi_namespace_node *node,
29 struct acpi_walk_state *walk_state);
30
31/*******************************************************************************
32 *
33 * FUNCTION: acpi_ex_store
34 *
35 * PARAMETERS: *source_desc - Value to be stored
36 * *dest_desc - Where to store it. Must be an NS node
37 * or union acpi_operand_object of type
38 * Reference;
39 * walk_state - Current walk state
40 *
41 * RETURN: Status
42 *
43 * DESCRIPTION: Store the value described by source_desc into the location
44 * described by dest_desc. Called by various interpreter
45 * functions to store the result of an operation into
46 * the destination operand -- not just simply the actual "Store"
47 * ASL operator.
48 *
49 ******************************************************************************/
50
51acpi_status
52acpi_ex_store(union acpi_operand_object *source_desc,
53 union acpi_operand_object *dest_desc,
54 struct acpi_walk_state *walk_state)
55{
56 acpi_status status = AE_OK;
57 union acpi_operand_object *ref_desc = dest_desc;
58
59 ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);
60
61 /* Validate parameters */
62
63 if (!source_desc || !dest_desc) {
64 ACPI_ERROR((AE_INFO, "Null parameter"));
65 return_ACPI_STATUS(AE_AML_NO_OPERAND);
66 }
67
68 /* dest_desc can be either a namespace node or an ACPI object */
69
70 if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
71 /*
72 * Dest is a namespace node,
73 * Storing an object into a Named node.
74 */
75 status = acpi_ex_store_object_to_node(source_desc,
76 (struct
77 acpi_namespace_node *)
78 dest_desc, walk_state,
79 ACPI_IMPLICIT_CONVERSION);
80
81 return_ACPI_STATUS(status);
82 }
83
84 /* Destination object must be a Reference or a Constant object */
85
86 switch (dest_desc->common.type) {
87 case ACPI_TYPE_LOCAL_REFERENCE:
88
89 break;
90
91 case ACPI_TYPE_INTEGER:
92
93 /* Allow stores to Constants -- a Noop as per ACPI spec */
94
95 if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
96 return_ACPI_STATUS(AE_OK);
97 }
98
99 ACPI_FALLTHROUGH;
100
101 default:
102
103 /* Destination is not a Reference object */
104
105 ACPI_ERROR((AE_INFO,
106 "Target is not a Reference or Constant object - [%s] %p",
107 acpi_ut_get_object_type_name(dest_desc),
108 dest_desc));
109
110 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
111 }
112
113 /*
114 * Examine the Reference class. These cases are handled:
115 *
116 * 1) Store to Name (Change the object associated with a name)
117 * 2) Store to an indexed area of a Buffer or Package
118 * 3) Store to a Method Local or Arg
119 * 4) Store to the debug object
120 */
121 switch (ref_desc->reference.class) {
122 case ACPI_REFCLASS_REFOF:
123
124 /* Storing an object into a Name "container" */
125
126 status = acpi_ex_store_object_to_node(source_desc,
127 ref_desc->reference.
128 object, walk_state,
129 ACPI_IMPLICIT_CONVERSION);
130 break;
131
132 case ACPI_REFCLASS_INDEX:
133
134 /* Storing to an Index (pointer into a packager or buffer) */
135
136 status =
137 acpi_ex_store_object_to_index(source_desc, ref_desc,
138 walk_state);
139 break;
140
141 case ACPI_REFCLASS_LOCAL:
142 case ACPI_REFCLASS_ARG:
143
144 /* Store to a method local/arg */
145
146 status =
147 acpi_ds_store_object_to_local(ref_desc->reference.class,
148 ref_desc->reference.value,
149 source_desc, walk_state);
150 break;
151
152 case ACPI_REFCLASS_DEBUG:
153 /*
154 * Storing to the Debug object causes the value stored to be
155 * displayed and otherwise has no effect -- see ACPI Specification
156 */
157 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
158 "**** Write to Debug Object: Object %p [%s] ****:\n\n",
159 source_desc,
160 acpi_ut_get_object_type_name(source_desc)));
161
162 ACPI_DEBUG_OBJECT(source_desc, 0, 0);
163 break;
164
165 default:
166
167 ACPI_ERROR((AE_INFO, "Unknown Reference Class 0x%2.2X",
168 ref_desc->reference.class));
169 ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_INFO);
170
171 status = AE_AML_INTERNAL;
172 break;
173 }
174
175 return_ACPI_STATUS(status);
176}
177
178/*******************************************************************************
179 *
180 * FUNCTION: acpi_ex_store_object_to_index
181 *
182 * PARAMETERS: *source_desc - Value to be stored
183 * *dest_desc - Named object to receive the value
184 * walk_state - Current walk state
185 *
186 * RETURN: Status
187 *
188 * DESCRIPTION: Store the object to indexed Buffer or Package element
189 *
190 ******************************************************************************/
191
192static acpi_status
193acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
194 union acpi_operand_object *index_desc,
195 struct acpi_walk_state *walk_state)
196{
197 acpi_status status = AE_OK;
198 union acpi_operand_object *obj_desc;
199 union acpi_operand_object *new_desc;
200 u8 value = 0;
201 u32 i;
202
203 ACPI_FUNCTION_TRACE(ex_store_object_to_index);
204
205 /*
206 * Destination must be a reference pointer, and
207 * must point to either a buffer or a package
208 */
209 switch (index_desc->reference.target_type) {
210 case ACPI_TYPE_PACKAGE:
211 /*
212 * Storing to a package element. Copy the object and replace
213 * any existing object with the new object. No implicit
214 * conversion is performed.
215 *
216 * The object at *(index_desc->Reference.Where) is the
217 * element within the package that is to be modified.
218 * The parent package object is at index_desc->Reference.Object
219 */
220 obj_desc = *(index_desc->reference.where);
221
222 if (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE &&
223 source_desc->reference.class == ACPI_REFCLASS_TABLE) {
224
225 /* This is a DDBHandle, just add a reference to it */
226
227 acpi_ut_add_reference(source_desc);
228 new_desc = source_desc;
229 } else {
230 /* Normal object, copy it */
231
232 status =
233 acpi_ut_copy_iobject_to_iobject(source_desc,
234 &new_desc,
235 walk_state);
236 if (ACPI_FAILURE(status)) {
237 return_ACPI_STATUS(status);
238 }
239 }
240
241 if (obj_desc) {
242
243 /* Decrement reference count by the ref count of the parent package */
244
245 for (i = 0; i < ((union acpi_operand_object *)
246 index_desc->reference.object)->common.
247 reference_count; i++) {
248 acpi_ut_remove_reference(obj_desc);
249 }
250 }
251
252 *(index_desc->reference.where) = new_desc;
253
254 /* Increment ref count by the ref count of the parent package-1 */
255
256 for (i = 1; i < ((union acpi_operand_object *)
257 index_desc->reference.object)->common.
258 reference_count; i++) {
259 acpi_ut_add_reference(new_desc);
260 }
261
262 break;
263
264 case ACPI_TYPE_BUFFER_FIELD:
265 /*
266 * Store into a Buffer or String (not actually a real buffer_field)
267 * at a location defined by an Index.
268 *
269 * The first 8-bit element of the source object is written to the
270 * 8-bit Buffer location defined by the Index destination object,
271 * according to the ACPI 2.0 specification.
272 */
273
274 /*
275 * Make sure the target is a Buffer or String. An error should
276 * not happen here, since the reference_object was constructed
277 * by the INDEX_OP code.
278 */
279 obj_desc = index_desc->reference.object;
280 if ((obj_desc->common.type != ACPI_TYPE_BUFFER) &&
281 (obj_desc->common.type != ACPI_TYPE_STRING)) {
282 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
283 }
284
285 /*
286 * The assignment of the individual elements will be slightly
287 * different for each source type.
288 */
289 switch (source_desc->common.type) {
290 case ACPI_TYPE_INTEGER:
291
292 /* Use the least-significant byte of the integer */
293
294 value = (u8) (source_desc->integer.value);
295 break;
296
297 case ACPI_TYPE_BUFFER:
298 case ACPI_TYPE_STRING:
299
300 /* Note: Takes advantage of common string/buffer fields */
301
302 value = source_desc->buffer.pointer[0];
303 break;
304
305 default:
306
307 /* All other types are invalid */
308
309 ACPI_ERROR((AE_INFO,
310 "Source must be type [Integer/Buffer/String], found [%s]",
311 acpi_ut_get_object_type_name(source_desc)));
312 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
313 }
314
315 /* Store the source value into the target buffer byte */
316
317 obj_desc->buffer.pointer[index_desc->reference.value] = value;
318 break;
319
320 default:
321 ACPI_ERROR((AE_INFO,
322 "Target is not of type [Package/BufferField]"));
323 status = AE_AML_TARGET_TYPE;
324 break;
325 }
326
327 return_ACPI_STATUS(status);
328}
329
330/*******************************************************************************
331 *
332 * FUNCTION: acpi_ex_store_object_to_node
333 *
334 * PARAMETERS: source_desc - Value to be stored
335 * node - Named object to receive the value
336 * walk_state - Current walk state
337 * implicit_conversion - Perform implicit conversion (yes/no)
338 *
339 * RETURN: Status
340 *
341 * DESCRIPTION: Store the object to the named object.
342 *
343 * The assignment of an object to a named object is handled here.
344 * The value passed in will replace the current value (if any)
345 * with the input value.
346 *
347 * When storing into an object the data is converted to the
348 * target object type then stored in the object. This means
349 * that the target object type (for an initialized target) will
350 * not be changed by a store operation. A copy_object can change
351 * the target type, however.
352 *
353 * The implicit_conversion flag is set to NO/FALSE only when
354 * storing to an arg_x -- as per the rules of the ACPI spec.
355 *
356 * Assumes parameters are already validated.
357 *
358 ******************************************************************************/
359
360acpi_status
361acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
362 struct acpi_namespace_node *node,
363 struct acpi_walk_state *walk_state,
364 u8 implicit_conversion)
365{
366 acpi_status status = AE_OK;
367 union acpi_operand_object *target_desc;
368 union acpi_operand_object *new_desc;
369 acpi_object_type target_type;
370
371 ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
372
373 /* Get current type of the node, and object attached to Node */
374
375 target_type = acpi_ns_get_type(node);
376 target_desc = acpi_ns_get_attached_object(node);
377
378 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p [%s] to node %p [%s]\n",
379 source_desc,
380 acpi_ut_get_object_type_name(source_desc), node,
381 acpi_ut_get_type_name(target_type)));
382
383 /* Only limited target types possible for everything except copy_object */
384
385 if (walk_state->opcode != AML_COPY_OBJECT_OP) {
386 /*
387 * Only copy_object allows all object types to be overwritten. For
388 * target_ref(s), there are restrictions on the object types that
389 * are allowed.
390 *
391 * Allowable operations/typing for Store:
392 *
393 * 1) Simple Store
394 * Integer --> Integer (Named/Local/Arg)
395 * String --> String (Named/Local/Arg)
396 * Buffer --> Buffer (Named/Local/Arg)
397 * Package --> Package (Named/Local/Arg)
398 *
399 * 2) Store with implicit conversion
400 * Integer --> String or Buffer (Named)
401 * String --> Integer or Buffer (Named)
402 * Buffer --> Integer or String (Named)
403 */
404 switch (target_type) {
405 case ACPI_TYPE_PACKAGE:
406 /*
407 * Here, can only store a package to an existing package.
408 * Storing a package to a Local/Arg is OK, and handled
409 * elsewhere.
410 */
411 if (walk_state->opcode == AML_STORE_OP) {
412 if (source_desc->common.type !=
413 ACPI_TYPE_PACKAGE) {
414 ACPI_ERROR((AE_INFO,
415 "Cannot assign type [%s] to [Package] "
416 "(source must be type Pkg)",
417 acpi_ut_get_object_type_name
418 (source_desc)));
419
420 return_ACPI_STATUS(AE_AML_TARGET_TYPE);
421 }
422 break;
423 }
424
425 ACPI_FALLTHROUGH;
426
427 case ACPI_TYPE_DEVICE:
428 case ACPI_TYPE_EVENT:
429 case ACPI_TYPE_MUTEX:
430 case ACPI_TYPE_REGION:
431 case ACPI_TYPE_POWER:
432 case ACPI_TYPE_PROCESSOR:
433 case ACPI_TYPE_THERMAL:
434
435 ACPI_ERROR((AE_INFO,
436 "Target must be [Buffer/Integer/String/Reference]"
437 ", found [%s] (%4.4s)",
438 acpi_ut_get_type_name(node->type),
439 node->name.ascii));
440
441 return_ACPI_STATUS(AE_AML_TARGET_TYPE);
442
443 default:
444 break;
445 }
446 }
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 /* Do the actual store operation */
458
459 switch (target_type) {
460 /*
461 * The simple data types all support implicit source operand
462 * conversion before the store.
463 */
464 case ACPI_TYPE_INTEGER:
465 case ACPI_TYPE_STRING:
466 case ACPI_TYPE_BUFFER:
467
468 if ((walk_state->opcode == AML_COPY_OBJECT_OP) ||
469 !implicit_conversion) {
470 /*
471 * However, copy_object and Stores to arg_x do not perform
472 * an implicit conversion, as per the ACPI specification.
473 * A direct store is performed instead.
474 */
475 status =
476 acpi_ex_store_direct_to_node(source_desc, node,
477 walk_state);
478 break;
479 }
480
481 /* Store with implicit source operand conversion support */
482
483 status =
484 acpi_ex_store_object_to_object(source_desc, target_desc,
485 &new_desc, walk_state);
486 if (ACPI_FAILURE(status)) {
487 return_ACPI_STATUS(status);
488 }
489
490 if (new_desc != target_desc) {
491 /*
492 * Store the new new_desc as the new value of the Name, and set
493 * the Name's type to that of the value being stored in it.
494 * source_desc reference count is incremented by attach_object.
495 *
496 * Note: This may change the type of the node if an explicit
497 * store has been performed such that the node/object type
498 * has been changed.
499 */
500 status =
501 acpi_ns_attach_object(node, new_desc,
502 new_desc->common.type);
503
504 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
505 "Store type [%s] into [%s] via Convert/Attach\n",
506 acpi_ut_get_object_type_name
507 (source_desc),
508 acpi_ut_get_object_type_name
509 (new_desc)));
510 }
511 break;
512
513 case ACPI_TYPE_BUFFER_FIELD:
514 case ACPI_TYPE_LOCAL_REGION_FIELD:
515 case ACPI_TYPE_LOCAL_BANK_FIELD:
516 case ACPI_TYPE_LOCAL_INDEX_FIELD:
517 /*
518 * For all fields, always write the source data to the target
519 * field. Any required implicit source operand conversion is
520 * performed in the function below as necessary. Note, field
521 * objects must retain their original type permanently.
522 */
523 status = acpi_ex_write_data_to_field(source_desc, target_desc,
524 &walk_state->result_obj);
525 break;
526
527 default:
528 /*
529 * copy_object operator: No conversions for all other types.
530 * Instead, directly store a copy of the source object.
531 *
532 * This is the ACPI spec-defined behavior for the copy_object
533 * operator. (Note, for this default case, all normal
534 * Store/Target operations exited above with an error).
535 */
536 status =
537 acpi_ex_store_direct_to_node(source_desc, node, walk_state);
538 break;
539 }
540
541 return_ACPI_STATUS(status);
542}
543
544/*******************************************************************************
545 *
546 * FUNCTION: acpi_ex_store_direct_to_node
547 *
548 * PARAMETERS: source_desc - Value to be stored
549 * node - Named object to receive the value
550 * walk_state - Current walk state
551 *
552 * RETURN: Status
553 *
554 * DESCRIPTION: "Store" an object directly to a node. This involves a copy
555 * and an attach.
556 *
557 ******************************************************************************/
558
559static acpi_status
560acpi_ex_store_direct_to_node(union acpi_operand_object *source_desc,
561 struct acpi_namespace_node *node,
562 struct acpi_walk_state *walk_state)
563{
564 acpi_status status;
565 union acpi_operand_object *new_desc;
566
567 ACPI_FUNCTION_TRACE(ex_store_direct_to_node);
568
569 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
570 "Storing [%s] (%p) directly into node [%s] (%p)"
571 " with no implicit conversion\n",
572 acpi_ut_get_object_type_name(source_desc),
573 source_desc, acpi_ut_get_type_name(node->type),
574 node));
575
576 /* Copy the source object to a new object */
577
578 status =
579 acpi_ut_copy_iobject_to_iobject(source_desc, &new_desc, walk_state);
580 if (ACPI_FAILURE(status)) {
581 return_ACPI_STATUS(status);
582 }
583
584 /* Attach the new object to the node */
585
586 status = acpi_ns_attach_object(node, new_desc, new_desc->common.type);
587 acpi_ut_remove_reference(new_desc);
588 return_ACPI_STATUS(status);
589}
1/******************************************************************************
2 *
3 * Module Name: exstore - AML Interpreter object store support
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2012, 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
52ACPI_MODULE_NAME("exstore")
53
54/* Local prototypes */
55static acpi_status
56acpi_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
80acpi_status
81acpi_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
221static acpi_status
222acpi_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
385acpi_status
386acpi_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}