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 - 2019, 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
18 ACPI_MODULE_NAME("exstore")
19
20 /* Local prototypes */
21 static acpi_status
22 acpi_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
26 static acpi_status
27 acpi_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
51 acpi_status
52 acpi_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 /*lint -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
192 static acpi_status
193 acpi_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
360 acpi_status
361 acpi_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 /* 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
559 static acpi_status
560 acpi_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 }