1 | // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
2 | /******************************************************************************* |
3 | * |
4 | * Module Name: dsmthdat - control method arguments and local variables |
5 | * |
6 | ******************************************************************************/ |
7 | |
8 | #include <acpi/acpi.h> |
9 | #include "accommon.h" |
10 | #include "acdispat.h" |
11 | #include "acnamesp.h" |
12 | #include "acinterp.h" |
13 | |
14 | #define _COMPONENT ACPI_DISPATCHER |
15 | ACPI_MODULE_NAME("dsmthdat" ) |
16 | |
17 | /* Local prototypes */ |
18 | static void |
19 | acpi_ds_method_data_delete_value(u8 type, |
20 | u32 index, struct acpi_walk_state *walk_state); |
21 | |
22 | static acpi_status |
23 | acpi_ds_method_data_set_value(u8 type, |
24 | u32 index, |
25 | union acpi_operand_object *object, |
26 | struct acpi_walk_state *walk_state); |
27 | |
28 | #ifdef ACPI_OBSOLETE_FUNCTIONS |
29 | acpi_object_type |
30 | acpi_ds_method_data_get_type(u16 opcode, |
31 | u32 index, struct acpi_walk_state *walk_state); |
32 | #endif |
33 | |
34 | /******************************************************************************* |
35 | * |
36 | * FUNCTION: acpi_ds_method_data_init |
37 | * |
38 | * PARAMETERS: walk_state - Current walk state object |
39 | * |
40 | * RETURN: Status |
41 | * |
42 | * DESCRIPTION: Initialize the data structures that hold the method's arguments |
43 | * and locals. The data struct is an array of namespace nodes for |
44 | * each - this allows ref_of and de_ref_of to work properly for these |
45 | * special data types. |
46 | * |
47 | * NOTES: walk_state fields are initialized to zero by the |
48 | * ACPI_ALLOCATE_ZEROED(). |
49 | * |
50 | * A pseudo-Namespace Node is assigned to each argument and local |
51 | * so that ref_of() can return a pointer to the Node. |
52 | * |
53 | ******************************************************************************/ |
54 | |
55 | void acpi_ds_method_data_init(struct acpi_walk_state *walk_state) |
56 | { |
57 | u32 i; |
58 | |
59 | ACPI_FUNCTION_TRACE(ds_method_data_init); |
60 | |
61 | /* Init the method arguments */ |
62 | |
63 | for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) { |
64 | ACPI_MOVE_32_TO_32(&walk_state->arguments[i].name, |
65 | NAMEOF_ARG_NTE); |
66 | |
67 | walk_state->arguments[i].name.integer |= (i << 24); |
68 | walk_state->arguments[i].descriptor_type = ACPI_DESC_TYPE_NAMED; |
69 | walk_state->arguments[i].type = ACPI_TYPE_ANY; |
70 | walk_state->arguments[i].flags = ANOBJ_METHOD_ARG; |
71 | } |
72 | |
73 | /* Init the method locals */ |
74 | |
75 | for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++) { |
76 | ACPI_MOVE_32_TO_32(&walk_state->local_variables[i].name, |
77 | NAMEOF_LOCAL_NTE); |
78 | |
79 | walk_state->local_variables[i].name.integer |= (i << 24); |
80 | walk_state->local_variables[i].descriptor_type = |
81 | ACPI_DESC_TYPE_NAMED; |
82 | walk_state->local_variables[i].type = ACPI_TYPE_ANY; |
83 | walk_state->local_variables[i].flags = ANOBJ_METHOD_LOCAL; |
84 | } |
85 | |
86 | return_VOID; |
87 | } |
88 | |
89 | /******************************************************************************* |
90 | * |
91 | * FUNCTION: acpi_ds_method_data_delete_all |
92 | * |
93 | * PARAMETERS: walk_state - Current walk state object |
94 | * |
95 | * RETURN: None |
96 | * |
97 | * DESCRIPTION: Delete method locals and arguments. Arguments are only |
98 | * deleted if this method was called from another method. |
99 | * |
100 | ******************************************************************************/ |
101 | |
102 | void acpi_ds_method_data_delete_all(struct acpi_walk_state *walk_state) |
103 | { |
104 | u32 index; |
105 | |
106 | ACPI_FUNCTION_TRACE(ds_method_data_delete_all); |
107 | |
108 | /* Detach the locals */ |
109 | |
110 | for (index = 0; index < ACPI_METHOD_NUM_LOCALS; index++) { |
111 | if (walk_state->local_variables[index].object) { |
112 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Local%u=%p\n" , |
113 | index, |
114 | walk_state->local_variables[index]. |
115 | object)); |
116 | |
117 | /* Detach object (if present) and remove a reference */ |
118 | |
119 | acpi_ns_detach_object(node: &walk_state-> |
120 | local_variables[index]); |
121 | } |
122 | } |
123 | |
124 | /* Detach the arguments */ |
125 | |
126 | for (index = 0; index < ACPI_METHOD_NUM_ARGS; index++) { |
127 | if (walk_state->arguments[index].object) { |
128 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Arg%u=%p\n" , |
129 | index, |
130 | walk_state->arguments[index].object)); |
131 | |
132 | /* Detach object (if present) and remove a reference */ |
133 | |
134 | acpi_ns_detach_object(node: &walk_state->arguments[index]); |
135 | } |
136 | } |
137 | |
138 | return_VOID; |
139 | } |
140 | |
141 | /******************************************************************************* |
142 | * |
143 | * FUNCTION: acpi_ds_method_data_init_args |
144 | * |
145 | * PARAMETERS: *params - Pointer to a parameter list for the method |
146 | * max_param_count - The arg count for this method |
147 | * walk_state - Current walk state object |
148 | * |
149 | * RETURN: Status |
150 | * |
151 | * DESCRIPTION: Initialize arguments for a method. The parameter list is a list |
152 | * of ACPI operand objects, either null terminated or whose length |
153 | * is defined by max_param_count. |
154 | * |
155 | ******************************************************************************/ |
156 | |
157 | acpi_status |
158 | acpi_ds_method_data_init_args(union acpi_operand_object **params, |
159 | u32 max_param_count, |
160 | struct acpi_walk_state *walk_state) |
161 | { |
162 | acpi_status status; |
163 | u32 index = 0; |
164 | |
165 | ACPI_FUNCTION_TRACE_PTR(ds_method_data_init_args, params); |
166 | |
167 | if (!params) { |
168 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
169 | "No parameter list passed to method\n" )); |
170 | return_ACPI_STATUS(AE_OK); |
171 | } |
172 | |
173 | /* Copy passed parameters into the new method stack frame */ |
174 | |
175 | while ((index < ACPI_METHOD_NUM_ARGS) && |
176 | (index < max_param_count) && params[index]) { |
177 | /* |
178 | * A valid parameter. |
179 | * Store the argument in the method/walk descriptor. |
180 | * Do not copy the arg in order to implement call by reference |
181 | */ |
182 | status = |
183 | acpi_ds_method_data_set_value(type: ACPI_REFCLASS_ARG, index, |
184 | object: params[index], walk_state); |
185 | if (ACPI_FAILURE(status)) { |
186 | return_ACPI_STATUS(status); |
187 | } |
188 | |
189 | index++; |
190 | } |
191 | |
192 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%u args passed to method\n" , index)); |
193 | return_ACPI_STATUS(AE_OK); |
194 | } |
195 | |
196 | /******************************************************************************* |
197 | * |
198 | * FUNCTION: acpi_ds_method_data_get_node |
199 | * |
200 | * PARAMETERS: type - Either ACPI_REFCLASS_LOCAL or |
201 | * ACPI_REFCLASS_ARG |
202 | * index - Which Local or Arg whose type to get |
203 | * walk_state - Current walk state object |
204 | * node - Where the node is returned. |
205 | * |
206 | * RETURN: Status and node |
207 | * |
208 | * DESCRIPTION: Get the Node associated with a local or arg. |
209 | * |
210 | ******************************************************************************/ |
211 | |
212 | acpi_status |
213 | acpi_ds_method_data_get_node(u8 type, |
214 | u32 index, |
215 | struct acpi_walk_state *walk_state, |
216 | struct acpi_namespace_node **node) |
217 | { |
218 | ACPI_FUNCTION_TRACE(ds_method_data_get_node); |
219 | |
220 | /* |
221 | * Method Locals and Arguments are supported |
222 | */ |
223 | switch (type) { |
224 | case ACPI_REFCLASS_LOCAL: |
225 | |
226 | if (index > ACPI_METHOD_MAX_LOCAL) { |
227 | ACPI_ERROR((AE_INFO, |
228 | "Local index %u is invalid (max %u)" , |
229 | index, ACPI_METHOD_MAX_LOCAL)); |
230 | return_ACPI_STATUS(AE_AML_INVALID_INDEX); |
231 | } |
232 | |
233 | /* Return a pointer to the pseudo-node */ |
234 | |
235 | *node = &walk_state->local_variables[index]; |
236 | break; |
237 | |
238 | case ACPI_REFCLASS_ARG: |
239 | |
240 | if (index > ACPI_METHOD_MAX_ARG) { |
241 | ACPI_ERROR((AE_INFO, |
242 | "Arg index %u is invalid (max %u)" , |
243 | index, ACPI_METHOD_MAX_ARG)); |
244 | return_ACPI_STATUS(AE_AML_INVALID_INDEX); |
245 | } |
246 | |
247 | /* Return a pointer to the pseudo-node */ |
248 | |
249 | *node = &walk_state->arguments[index]; |
250 | break; |
251 | |
252 | default: |
253 | |
254 | ACPI_ERROR((AE_INFO, "Type %u is invalid" , type)); |
255 | return_ACPI_STATUS(AE_TYPE); |
256 | } |
257 | |
258 | return_ACPI_STATUS(AE_OK); |
259 | } |
260 | |
261 | /******************************************************************************* |
262 | * |
263 | * FUNCTION: acpi_ds_method_data_set_value |
264 | * |
265 | * PARAMETERS: type - Either ACPI_REFCLASS_LOCAL or |
266 | * ACPI_REFCLASS_ARG |
267 | * index - Which Local or Arg to get |
268 | * object - Object to be inserted into the stack entry |
269 | * walk_state - Current walk state object |
270 | * |
271 | * RETURN: Status |
272 | * |
273 | * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index. |
274 | * Note: There is no "implicit conversion" for locals. |
275 | * |
276 | ******************************************************************************/ |
277 | |
278 | static acpi_status |
279 | acpi_ds_method_data_set_value(u8 type, |
280 | u32 index, |
281 | union acpi_operand_object *object, |
282 | struct acpi_walk_state *walk_state) |
283 | { |
284 | acpi_status status; |
285 | struct acpi_namespace_node *node; |
286 | |
287 | ACPI_FUNCTION_TRACE(ds_method_data_set_value); |
288 | |
289 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
290 | "NewObj %p Type %2.2X, Refs=%u [%s]\n" , object, |
291 | type, object->common.reference_count, |
292 | acpi_ut_get_type_name(object->common.type))); |
293 | |
294 | /* Get the namespace node for the arg/local */ |
295 | |
296 | status = acpi_ds_method_data_get_node(type, index, walk_state, node: &node); |
297 | if (ACPI_FAILURE(status)) { |
298 | return_ACPI_STATUS(status); |
299 | } |
300 | |
301 | /* |
302 | * Increment ref count so object can't be deleted while installed. |
303 | * NOTE: We do not copy the object in order to preserve the call by |
304 | * reference semantics of ACPI Control Method invocation. |
305 | * (See ACPI Specification 2.0C) |
306 | */ |
307 | acpi_ut_add_reference(object); |
308 | |
309 | /* Install the object */ |
310 | |
311 | node->object = object; |
312 | return_ACPI_STATUS(status); |
313 | } |
314 | |
315 | /******************************************************************************* |
316 | * |
317 | * FUNCTION: acpi_ds_method_data_get_value |
318 | * |
319 | * PARAMETERS: type - Either ACPI_REFCLASS_LOCAL or |
320 | * ACPI_REFCLASS_ARG |
321 | * index - Which localVar or argument to get |
322 | * walk_state - Current walk state object |
323 | * dest_desc - Where Arg or Local value is returned |
324 | * |
325 | * RETURN: Status |
326 | * |
327 | * DESCRIPTION: Retrieve value of selected Arg or Local for this method |
328 | * Used only in acpi_ex_resolve_to_value(). |
329 | * |
330 | ******************************************************************************/ |
331 | |
332 | acpi_status |
333 | acpi_ds_method_data_get_value(u8 type, |
334 | u32 index, |
335 | struct acpi_walk_state *walk_state, |
336 | union acpi_operand_object **dest_desc) |
337 | { |
338 | acpi_status status; |
339 | struct acpi_namespace_node *node; |
340 | union acpi_operand_object *object; |
341 | |
342 | ACPI_FUNCTION_TRACE(ds_method_data_get_value); |
343 | |
344 | /* Validate the object descriptor */ |
345 | |
346 | if (!dest_desc) { |
347 | ACPI_ERROR((AE_INFO, "Null object descriptor pointer" )); |
348 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
349 | } |
350 | |
351 | /* Get the namespace node for the arg/local */ |
352 | |
353 | status = acpi_ds_method_data_get_node(type, index, walk_state, node: &node); |
354 | if (ACPI_FAILURE(status)) { |
355 | return_ACPI_STATUS(status); |
356 | } |
357 | |
358 | /* Get the object from the node */ |
359 | |
360 | object = node->object; |
361 | |
362 | /* Examine the returned object, it must be valid. */ |
363 | |
364 | if (!object) { |
365 | /* |
366 | * Index points to uninitialized object. |
367 | * This means that either 1) The expected argument was |
368 | * not passed to the method, or 2) A local variable |
369 | * was referenced by the method (via the ASL) |
370 | * before it was initialized. Either case is an error. |
371 | */ |
372 | |
373 | /* If slack enabled, init the local_x/arg_x to an Integer of value zero */ |
374 | |
375 | if (acpi_gbl_enable_interpreter_slack) { |
376 | object = acpi_ut_create_integer_object(value: (u64) 0); |
377 | if (!object) { |
378 | return_ACPI_STATUS(AE_NO_MEMORY); |
379 | } |
380 | |
381 | node->object = object; |
382 | } |
383 | |
384 | /* Otherwise, return the error */ |
385 | |
386 | else |
387 | switch (type) { |
388 | case ACPI_REFCLASS_ARG: |
389 | |
390 | ACPI_ERROR((AE_INFO, |
391 | "Uninitialized Arg[%u] at node %p" , |
392 | index, node)); |
393 | |
394 | return_ACPI_STATUS(AE_AML_UNINITIALIZED_ARG); |
395 | |
396 | case ACPI_REFCLASS_LOCAL: |
397 | /* |
398 | * No error message for this case, will be trapped again later to |
399 | * detect and ignore cases of Store(local_x,local_x) |
400 | */ |
401 | return_ACPI_STATUS(AE_AML_UNINITIALIZED_LOCAL); |
402 | |
403 | default: |
404 | |
405 | ACPI_ERROR((AE_INFO, |
406 | "Not a Arg/Local opcode: 0x%X" , |
407 | type)); |
408 | return_ACPI_STATUS(AE_AML_INTERNAL); |
409 | } |
410 | } |
411 | |
412 | /* |
413 | * The Index points to an initialized and valid object. |
414 | * Return an additional reference to the object |
415 | */ |
416 | *dest_desc = object; |
417 | acpi_ut_add_reference(object); |
418 | |
419 | return_ACPI_STATUS(AE_OK); |
420 | } |
421 | |
422 | /******************************************************************************* |
423 | * |
424 | * FUNCTION: acpi_ds_method_data_delete_value |
425 | * |
426 | * PARAMETERS: type - Either ACPI_REFCLASS_LOCAL or |
427 | * ACPI_REFCLASS_ARG |
428 | * index - Which localVar or argument to delete |
429 | * walk_state - Current walk state object |
430 | * |
431 | * RETURN: None |
432 | * |
433 | * DESCRIPTION: Delete the entry at Opcode:Index. Inserts |
434 | * a null into the stack slot after the object is deleted. |
435 | * |
436 | ******************************************************************************/ |
437 | |
438 | static void |
439 | acpi_ds_method_data_delete_value(u8 type, |
440 | u32 index, struct acpi_walk_state *walk_state) |
441 | { |
442 | acpi_status status; |
443 | struct acpi_namespace_node *node; |
444 | union acpi_operand_object *object; |
445 | |
446 | ACPI_FUNCTION_TRACE(ds_method_data_delete_value); |
447 | |
448 | /* Get the namespace node for the arg/local */ |
449 | |
450 | status = acpi_ds_method_data_get_node(type, index, walk_state, node: &node); |
451 | if (ACPI_FAILURE(status)) { |
452 | return_VOID; |
453 | } |
454 | |
455 | /* Get the associated object */ |
456 | |
457 | object = acpi_ns_get_attached_object(node); |
458 | |
459 | /* |
460 | * Undefine the Arg or Local by setting its descriptor |
461 | * pointer to NULL. Locals/Args can contain both |
462 | * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs |
463 | */ |
464 | node->object = NULL; |
465 | |
466 | if ((object) && |
467 | (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_OPERAND)) { |
468 | /* |
469 | * There is a valid object. |
470 | * Decrement the reference count by one to balance the |
471 | * increment when the object was stored. |
472 | */ |
473 | acpi_ut_remove_reference(object); |
474 | } |
475 | |
476 | return_VOID; |
477 | } |
478 | |
479 | /******************************************************************************* |
480 | * |
481 | * FUNCTION: acpi_ds_store_object_to_local |
482 | * |
483 | * PARAMETERS: type - Either ACPI_REFCLASS_LOCAL or |
484 | * ACPI_REFCLASS_ARG |
485 | * index - Which Local or Arg to set |
486 | * obj_desc - Value to be stored |
487 | * walk_state - Current walk state |
488 | * |
489 | * RETURN: Status |
490 | * |
491 | * DESCRIPTION: Store a value in an Arg or Local. The obj_desc is installed |
492 | * as the new value for the Arg or Local and the reference count |
493 | * for obj_desc is incremented. |
494 | * |
495 | ******************************************************************************/ |
496 | |
497 | acpi_status |
498 | acpi_ds_store_object_to_local(u8 type, |
499 | u32 index, |
500 | union acpi_operand_object *obj_desc, |
501 | struct acpi_walk_state *walk_state) |
502 | { |
503 | acpi_status status; |
504 | struct acpi_namespace_node *node; |
505 | union acpi_operand_object *current_obj_desc; |
506 | union acpi_operand_object *new_obj_desc; |
507 | |
508 | ACPI_FUNCTION_TRACE(ds_store_object_to_local); |
509 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Type=%2.2X Index=%u Obj=%p\n" , |
510 | type, index, obj_desc)); |
511 | |
512 | /* Parameter validation */ |
513 | |
514 | if (!obj_desc) { |
515 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
516 | } |
517 | |
518 | /* Get the namespace node for the arg/local */ |
519 | |
520 | status = acpi_ds_method_data_get_node(type, index, walk_state, node: &node); |
521 | if (ACPI_FAILURE(status)) { |
522 | return_ACPI_STATUS(status); |
523 | } |
524 | |
525 | current_obj_desc = acpi_ns_get_attached_object(node); |
526 | if (current_obj_desc == obj_desc) { |
527 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p already installed!\n" , |
528 | obj_desc)); |
529 | return_ACPI_STATUS(status); |
530 | } |
531 | |
532 | /* |
533 | * If the reference count on the object is more than one, we must |
534 | * take a copy of the object before we store. A reference count |
535 | * of exactly 1 means that the object was just created during the |
536 | * evaluation of an expression, and we can safely use it since it |
537 | * is not used anywhere else. |
538 | */ |
539 | new_obj_desc = obj_desc; |
540 | if (obj_desc->common.reference_count > 1) { |
541 | status = |
542 | acpi_ut_copy_iobject_to_iobject(source_desc: obj_desc, dest_desc: &new_obj_desc, |
543 | walk_state); |
544 | if (ACPI_FAILURE(status)) { |
545 | return_ACPI_STATUS(status); |
546 | } |
547 | } |
548 | |
549 | /* |
550 | * If there is an object already in this slot, we either |
551 | * have to delete it, or if this is an argument and there |
552 | * is an object reference stored there, we have to do |
553 | * an indirect store! |
554 | */ |
555 | if (current_obj_desc) { |
556 | /* |
557 | * Check for an indirect store if an argument |
558 | * contains an object reference (stored as an Node). |
559 | * We don't allow this automatic dereferencing for |
560 | * locals, since a store to a local should overwrite |
561 | * anything there, including an object reference. |
562 | * |
563 | * If both Arg0 and Local0 contain ref_of (Local4): |
564 | * |
565 | * Store (1, Arg0) - Causes indirect store to local4 |
566 | * Store (1, Local0) - Stores 1 in local0, overwriting |
567 | * the reference to local4 |
568 | * Store (1, de_refof (Local0)) - Causes indirect store to local4 |
569 | * |
570 | * Weird, but true. |
571 | */ |
572 | if (type == ACPI_REFCLASS_ARG) { |
573 | /* |
574 | * If we have a valid reference object that came from ref_of(), |
575 | * do the indirect store |
576 | */ |
577 | if ((ACPI_GET_DESCRIPTOR_TYPE(current_obj_desc) == |
578 | ACPI_DESC_TYPE_OPERAND) && |
579 | (current_obj_desc->common.type == |
580 | ACPI_TYPE_LOCAL_REFERENCE) && |
581 | (current_obj_desc->reference.class == |
582 | ACPI_REFCLASS_REFOF)) { |
583 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
584 | "Arg (%p) is an ObjRef(Node), storing in node %p\n" , |
585 | new_obj_desc, |
586 | current_obj_desc)); |
587 | |
588 | /* |
589 | * Store this object to the Node (perform the indirect store) |
590 | * NOTE: No implicit conversion is performed, as per the ACPI |
591 | * specification rules on storing to Locals/Args. |
592 | */ |
593 | status = |
594 | acpi_ex_store_object_to_node(source_desc: new_obj_desc, |
595 | node: current_obj_desc-> |
596 | reference. |
597 | object, |
598 | walk_state, |
599 | ACPI_NO_IMPLICIT_CONVERSION); |
600 | |
601 | /* Remove local reference if we copied the object above */ |
602 | |
603 | if (new_obj_desc != obj_desc) { |
604 | acpi_ut_remove_reference(object: new_obj_desc); |
605 | } |
606 | |
607 | return_ACPI_STATUS(status); |
608 | } |
609 | } |
610 | |
611 | /* Delete the existing object before storing the new one */ |
612 | |
613 | acpi_ds_method_data_delete_value(type, index, walk_state); |
614 | } |
615 | |
616 | /* |
617 | * Install the Obj descriptor (*new_obj_desc) into |
618 | * the descriptor for the Arg or Local. |
619 | * (increments the object reference count by one) |
620 | */ |
621 | status = |
622 | acpi_ds_method_data_set_value(type, index, object: new_obj_desc, |
623 | walk_state); |
624 | |
625 | /* Remove local reference if we copied the object above */ |
626 | |
627 | if (new_obj_desc != obj_desc) { |
628 | acpi_ut_remove_reference(object: new_obj_desc); |
629 | } |
630 | |
631 | return_ACPI_STATUS(status); |
632 | } |
633 | |
634 | #ifdef ACPI_OBSOLETE_FUNCTIONS |
635 | /******************************************************************************* |
636 | * |
637 | * FUNCTION: acpi_ds_method_data_get_type |
638 | * |
639 | * PARAMETERS: opcode - Either AML_FIRST LOCAL_OP or |
640 | * AML_FIRST_ARG_OP |
641 | * index - Which Local or Arg whose type to get |
642 | * walk_state - Current walk state object |
643 | * |
644 | * RETURN: Data type of current value of the selected Arg or Local |
645 | * |
646 | * DESCRIPTION: Get the type of the object stored in the Local or Arg |
647 | * |
648 | ******************************************************************************/ |
649 | |
650 | acpi_object_type |
651 | acpi_ds_method_data_get_type(u16 opcode, |
652 | u32 index, struct acpi_walk_state *walk_state) |
653 | { |
654 | acpi_status status; |
655 | struct acpi_namespace_node *node; |
656 | union acpi_operand_object *object; |
657 | |
658 | ACPI_FUNCTION_TRACE(ds_method_data_get_type); |
659 | |
660 | /* Get the namespace node for the arg/local */ |
661 | |
662 | status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node); |
663 | if (ACPI_FAILURE(status)) { |
664 | return_VALUE((ACPI_TYPE_NOT_FOUND)); |
665 | } |
666 | |
667 | /* Get the object */ |
668 | |
669 | object = acpi_ns_get_attached_object(node); |
670 | if (!object) { |
671 | |
672 | /* Uninitialized local/arg, return TYPE_ANY */ |
673 | |
674 | return_VALUE(ACPI_TYPE_ANY); |
675 | } |
676 | |
677 | /* Get the object type */ |
678 | |
679 | return_VALUE(object->type); |
680 | } |
681 | #endif |
682 | |