xref: /openbmc/linux/drivers/acpi/acpica/dsmthdat.c (revision 6aa7de05)
1 /*******************************************************************************
2  *
3  * Module Name: dsmthdat - control method arguments and local variables
4  *
5  ******************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2017, 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 "acnamesp.h"
48 #include "acinterp.h"
49 
50 #define _COMPONENT          ACPI_DISPATCHER
51 ACPI_MODULE_NAME("dsmthdat")
52 
53 /* Local prototypes */
54 static void
55 acpi_ds_method_data_delete_value(u8 type,
56 				 u32 index, struct acpi_walk_state *walk_state);
57 
58 static acpi_status
59 acpi_ds_method_data_set_value(u8 type,
60 			      u32 index,
61 			      union acpi_operand_object *object,
62 			      struct acpi_walk_state *walk_state);
63 
64 #ifdef ACPI_OBSOLETE_FUNCTIONS
65 acpi_object_type
66 acpi_ds_method_data_get_type(u16 opcode,
67 			     u32 index, struct acpi_walk_state *walk_state);
68 #endif
69 
70 /*******************************************************************************
71  *
72  * FUNCTION:    acpi_ds_method_data_init
73  *
74  * PARAMETERS:  walk_state          - Current walk state object
75  *
76  * RETURN:      Status
77  *
78  * DESCRIPTION: Initialize the data structures that hold the method's arguments
79  *              and locals. The data struct is an array of namespace nodes for
80  *              each - this allows ref_of and de_ref_of to work properly for these
81  *              special data types.
82  *
83  * NOTES:       walk_state fields are initialized to zero by the
84  *              ACPI_ALLOCATE_ZEROED().
85  *
86  *              A pseudo-Namespace Node is assigned to each argument and local
87  *              so that ref_of() can return a pointer to the Node.
88  *
89  ******************************************************************************/
90 
91 void acpi_ds_method_data_init(struct acpi_walk_state *walk_state)
92 {
93 	u32 i;
94 
95 	ACPI_FUNCTION_TRACE(ds_method_data_init);
96 
97 	/* Init the method arguments */
98 
99 	for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) {
100 		ACPI_MOVE_32_TO_32(&walk_state->arguments[i].name,
101 				   NAMEOF_ARG_NTE);
102 
103 		walk_state->arguments[i].name.integer |= (i << 24);
104 		walk_state->arguments[i].descriptor_type = ACPI_DESC_TYPE_NAMED;
105 		walk_state->arguments[i].type = ACPI_TYPE_ANY;
106 		walk_state->arguments[i].flags = ANOBJ_METHOD_ARG;
107 	}
108 
109 	/* Init the method locals */
110 
111 	for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++) {
112 		ACPI_MOVE_32_TO_32(&walk_state->local_variables[i].name,
113 				   NAMEOF_LOCAL_NTE);
114 
115 		walk_state->local_variables[i].name.integer |= (i << 24);
116 		walk_state->local_variables[i].descriptor_type =
117 		    ACPI_DESC_TYPE_NAMED;
118 		walk_state->local_variables[i].type = ACPI_TYPE_ANY;
119 		walk_state->local_variables[i].flags = ANOBJ_METHOD_LOCAL;
120 	}
121 
122 	return_VOID;
123 }
124 
125 /*******************************************************************************
126  *
127  * FUNCTION:    acpi_ds_method_data_delete_all
128  *
129  * PARAMETERS:  walk_state          - Current walk state object
130  *
131  * RETURN:      None
132  *
133  * DESCRIPTION: Delete method locals and arguments. Arguments are only
134  *              deleted if this method was called from another method.
135  *
136  ******************************************************************************/
137 
138 void acpi_ds_method_data_delete_all(struct acpi_walk_state *walk_state)
139 {
140 	u32 index;
141 
142 	ACPI_FUNCTION_TRACE(ds_method_data_delete_all);
143 
144 	/* Detach the locals */
145 
146 	for (index = 0; index < ACPI_METHOD_NUM_LOCALS; index++) {
147 		if (walk_state->local_variables[index].object) {
148 			ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Local%u=%p\n",
149 					  index,
150 					  walk_state->local_variables[index].
151 					  object));
152 
153 			/* Detach object (if present) and remove a reference */
154 
155 			acpi_ns_detach_object(&walk_state->
156 					      local_variables[index]);
157 		}
158 	}
159 
160 	/* Detach the arguments */
161 
162 	for (index = 0; index < ACPI_METHOD_NUM_ARGS; index++) {
163 		if (walk_state->arguments[index].object) {
164 			ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Arg%u=%p\n",
165 					  index,
166 					  walk_state->arguments[index].object));
167 
168 			/* Detach object (if present) and remove a reference */
169 
170 			acpi_ns_detach_object(&walk_state->arguments[index]);
171 		}
172 	}
173 
174 	return_VOID;
175 }
176 
177 /*******************************************************************************
178  *
179  * FUNCTION:    acpi_ds_method_data_init_args
180  *
181  * PARAMETERS:  *params         - Pointer to a parameter list for the method
182  *              max_param_count - The arg count for this method
183  *              walk_state      - Current walk state object
184  *
185  * RETURN:      Status
186  *
187  * DESCRIPTION: Initialize arguments for a method. The parameter list is a list
188  *              of ACPI operand objects, either null terminated or whose length
189  *              is defined by max_param_count.
190  *
191  ******************************************************************************/
192 
193 acpi_status
194 acpi_ds_method_data_init_args(union acpi_operand_object **params,
195 			      u32 max_param_count,
196 			      struct acpi_walk_state *walk_state)
197 {
198 	acpi_status status;
199 	u32 index = 0;
200 
201 	ACPI_FUNCTION_TRACE_PTR(ds_method_data_init_args, params);
202 
203 	if (!params) {
204 		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
205 				  "No parameter list passed to method\n"));
206 		return_ACPI_STATUS(AE_OK);
207 	}
208 
209 	/* Copy passed parameters into the new method stack frame */
210 
211 	while ((index < ACPI_METHOD_NUM_ARGS) &&
212 	       (index < max_param_count) && params[index]) {
213 		/*
214 		 * A valid parameter.
215 		 * Store the argument in the method/walk descriptor.
216 		 * Do not copy the arg in order to implement call by reference
217 		 */
218 		status =
219 		    acpi_ds_method_data_set_value(ACPI_REFCLASS_ARG, index,
220 						  params[index], walk_state);
221 		if (ACPI_FAILURE(status)) {
222 			return_ACPI_STATUS(status);
223 		}
224 
225 		index++;
226 	}
227 
228 	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%u args passed to method\n", index));
229 	return_ACPI_STATUS(AE_OK);
230 }
231 
232 /*******************************************************************************
233  *
234  * FUNCTION:    acpi_ds_method_data_get_node
235  *
236  * PARAMETERS:  type                - Either ACPI_REFCLASS_LOCAL or
237  *                                    ACPI_REFCLASS_ARG
238  *              index               - Which Local or Arg whose type to get
239  *              walk_state          - Current walk state object
240  *              node                - Where the node is returned.
241  *
242  * RETURN:      Status and node
243  *
244  * DESCRIPTION: Get the Node associated with a local or arg.
245  *
246  ******************************************************************************/
247 
248 acpi_status
249 acpi_ds_method_data_get_node(u8 type,
250 			     u32 index,
251 			     struct acpi_walk_state *walk_state,
252 			     struct acpi_namespace_node **node)
253 {
254 	ACPI_FUNCTION_TRACE(ds_method_data_get_node);
255 
256 	/*
257 	 * Method Locals and Arguments are supported
258 	 */
259 	switch (type) {
260 	case ACPI_REFCLASS_LOCAL:
261 
262 		if (index > ACPI_METHOD_MAX_LOCAL) {
263 			ACPI_ERROR((AE_INFO,
264 				    "Local index %u is invalid (max %u)",
265 				    index, ACPI_METHOD_MAX_LOCAL));
266 			return_ACPI_STATUS(AE_AML_INVALID_INDEX);
267 		}
268 
269 		/* Return a pointer to the pseudo-node */
270 
271 		*node = &walk_state->local_variables[index];
272 		break;
273 
274 	case ACPI_REFCLASS_ARG:
275 
276 		if (index > ACPI_METHOD_MAX_ARG) {
277 			ACPI_ERROR((AE_INFO,
278 				    "Arg index %u is invalid (max %u)",
279 				    index, ACPI_METHOD_MAX_ARG));
280 			return_ACPI_STATUS(AE_AML_INVALID_INDEX);
281 		}
282 
283 		/* Return a pointer to the pseudo-node */
284 
285 		*node = &walk_state->arguments[index];
286 		break;
287 
288 	default:
289 
290 		ACPI_ERROR((AE_INFO, "Type %u is invalid", type));
291 		return_ACPI_STATUS(AE_TYPE);
292 	}
293 
294 	return_ACPI_STATUS(AE_OK);
295 }
296 
297 /*******************************************************************************
298  *
299  * FUNCTION:    acpi_ds_method_data_set_value
300  *
301  * PARAMETERS:  type                - Either ACPI_REFCLASS_LOCAL or
302  *                                    ACPI_REFCLASS_ARG
303  *              index               - Which Local or Arg to get
304  *              object              - Object to be inserted into the stack entry
305  *              walk_state          - Current walk state object
306  *
307  * RETURN:      Status
308  *
309  * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index.
310  *              Note: There is no "implicit conversion" for locals.
311  *
312  ******************************************************************************/
313 
314 static acpi_status
315 acpi_ds_method_data_set_value(u8 type,
316 			      u32 index,
317 			      union acpi_operand_object *object,
318 			      struct acpi_walk_state *walk_state)
319 {
320 	acpi_status status;
321 	struct acpi_namespace_node *node;
322 
323 	ACPI_FUNCTION_TRACE(ds_method_data_set_value);
324 
325 	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
326 			  "NewObj %p Type %2.2X, Refs=%u [%s]\n", object,
327 			  type, object->common.reference_count,
328 			  acpi_ut_get_type_name(object->common.type)));
329 
330 	/* Get the namespace node for the arg/local */
331 
332 	status = acpi_ds_method_data_get_node(type, index, walk_state, &node);
333 	if (ACPI_FAILURE(status)) {
334 		return_ACPI_STATUS(status);
335 	}
336 
337 	/*
338 	 * Increment ref count so object can't be deleted while installed.
339 	 * NOTE: We do not copy the object in order to preserve the call by
340 	 * reference semantics of ACPI Control Method invocation.
341 	 * (See ACPI Specification 2.0C)
342 	 */
343 	acpi_ut_add_reference(object);
344 
345 	/* Install the object */
346 
347 	node->object = object;
348 	return_ACPI_STATUS(status);
349 }
350 
351 /*******************************************************************************
352  *
353  * FUNCTION:    acpi_ds_method_data_get_value
354  *
355  * PARAMETERS:  type                - Either ACPI_REFCLASS_LOCAL or
356  *                                    ACPI_REFCLASS_ARG
357  *              index               - Which localVar or argument to get
358  *              walk_state          - Current walk state object
359  *              dest_desc           - Where Arg or Local value is returned
360  *
361  * RETURN:      Status
362  *
363  * DESCRIPTION: Retrieve value of selected Arg or Local for this method
364  *              Used only in acpi_ex_resolve_to_value().
365  *
366  ******************************************************************************/
367 
368 acpi_status
369 acpi_ds_method_data_get_value(u8 type,
370 			      u32 index,
371 			      struct acpi_walk_state *walk_state,
372 			      union acpi_operand_object **dest_desc)
373 {
374 	acpi_status status;
375 	struct acpi_namespace_node *node;
376 	union acpi_operand_object *object;
377 
378 	ACPI_FUNCTION_TRACE(ds_method_data_get_value);
379 
380 	/* Validate the object descriptor */
381 
382 	if (!dest_desc) {
383 		ACPI_ERROR((AE_INFO, "Null object descriptor pointer"));
384 		return_ACPI_STATUS(AE_BAD_PARAMETER);
385 	}
386 
387 	/* Get the namespace node for the arg/local */
388 
389 	status = acpi_ds_method_data_get_node(type, index, walk_state, &node);
390 	if (ACPI_FAILURE(status)) {
391 		return_ACPI_STATUS(status);
392 	}
393 
394 	/* Get the object from the node */
395 
396 	object = node->object;
397 
398 	/* Examine the returned object, it must be valid. */
399 
400 	if (!object) {
401 		/*
402 		 * Index points to uninitialized object.
403 		 * This means that either 1) The expected argument was
404 		 * not passed to the method, or 2) A local variable
405 		 * was referenced by the method (via the ASL)
406 		 * before it was initialized. Either case is an error.
407 		 */
408 
409 		/* If slack enabled, init the local_x/arg_x to an Integer of value zero */
410 
411 		if (acpi_gbl_enable_interpreter_slack) {
412 			object = acpi_ut_create_integer_object((u64) 0);
413 			if (!object) {
414 				return_ACPI_STATUS(AE_NO_MEMORY);
415 			}
416 
417 			node->object = object;
418 		}
419 
420 		/* Otherwise, return the error */
421 
422 		else
423 			switch (type) {
424 			case ACPI_REFCLASS_ARG:
425 
426 				ACPI_ERROR((AE_INFO,
427 					    "Uninitialized Arg[%u] at node %p",
428 					    index, node));
429 
430 				return_ACPI_STATUS(AE_AML_UNINITIALIZED_ARG);
431 
432 			case ACPI_REFCLASS_LOCAL:
433 				/*
434 				 * No error message for this case, will be trapped again later to
435 				 * detect and ignore cases of Store(local_x,local_x)
436 				 */
437 				return_ACPI_STATUS(AE_AML_UNINITIALIZED_LOCAL);
438 
439 			default:
440 
441 				ACPI_ERROR((AE_INFO,
442 					    "Not a Arg/Local opcode: 0x%X",
443 					    type));
444 				return_ACPI_STATUS(AE_AML_INTERNAL);
445 			}
446 	}
447 
448 	/*
449 	 * The Index points to an initialized and valid object.
450 	 * Return an additional reference to the object
451 	 */
452 	*dest_desc = object;
453 	acpi_ut_add_reference(object);
454 
455 	return_ACPI_STATUS(AE_OK);
456 }
457 
458 /*******************************************************************************
459  *
460  * FUNCTION:    acpi_ds_method_data_delete_value
461  *
462  * PARAMETERS:  type                - Either ACPI_REFCLASS_LOCAL or
463  *                                    ACPI_REFCLASS_ARG
464  *              index               - Which localVar or argument to delete
465  *              walk_state          - Current walk state object
466  *
467  * RETURN:      None
468  *
469  * DESCRIPTION: Delete the entry at Opcode:Index. Inserts
470  *              a null into the stack slot after the object is deleted.
471  *
472  ******************************************************************************/
473 
474 static void
475 acpi_ds_method_data_delete_value(u8 type,
476 				 u32 index, struct acpi_walk_state *walk_state)
477 {
478 	acpi_status status;
479 	struct acpi_namespace_node *node;
480 	union acpi_operand_object *object;
481 
482 	ACPI_FUNCTION_TRACE(ds_method_data_delete_value);
483 
484 	/* Get the namespace node for the arg/local */
485 
486 	status = acpi_ds_method_data_get_node(type, index, walk_state, &node);
487 	if (ACPI_FAILURE(status)) {
488 		return_VOID;
489 	}
490 
491 	/* Get the associated object */
492 
493 	object = acpi_ns_get_attached_object(node);
494 
495 	/*
496 	 * Undefine the Arg or Local by setting its descriptor
497 	 * pointer to NULL. Locals/Args can contain both
498 	 * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs
499 	 */
500 	node->object = NULL;
501 
502 	if ((object) &&
503 	    (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_OPERAND)) {
504 		/*
505 		 * There is a valid object.
506 		 * Decrement the reference count by one to balance the
507 		 * increment when the object was stored.
508 		 */
509 		acpi_ut_remove_reference(object);
510 	}
511 
512 	return_VOID;
513 }
514 
515 /*******************************************************************************
516  *
517  * FUNCTION:    acpi_ds_store_object_to_local
518  *
519  * PARAMETERS:  type                - Either ACPI_REFCLASS_LOCAL or
520  *                                    ACPI_REFCLASS_ARG
521  *              index               - Which Local or Arg to set
522  *              obj_desc            - Value to be stored
523  *              walk_state          - Current walk state
524  *
525  * RETURN:      Status
526  *
527  * DESCRIPTION: Store a value in an Arg or Local. The obj_desc is installed
528  *              as the new value for the Arg or Local and the reference count
529  *              for obj_desc is incremented.
530  *
531  ******************************************************************************/
532 
533 acpi_status
534 acpi_ds_store_object_to_local(u8 type,
535 			      u32 index,
536 			      union acpi_operand_object *obj_desc,
537 			      struct acpi_walk_state *walk_state)
538 {
539 	acpi_status status;
540 	struct acpi_namespace_node *node;
541 	union acpi_operand_object *current_obj_desc;
542 	union acpi_operand_object *new_obj_desc;
543 
544 	ACPI_FUNCTION_TRACE(ds_store_object_to_local);
545 	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Type=%2.2X Index=%u Obj=%p\n",
546 			  type, index, obj_desc));
547 
548 	/* Parameter validation */
549 
550 	if (!obj_desc) {
551 		return_ACPI_STATUS(AE_BAD_PARAMETER);
552 	}
553 
554 	/* Get the namespace node for the arg/local */
555 
556 	status = acpi_ds_method_data_get_node(type, index, walk_state, &node);
557 	if (ACPI_FAILURE(status)) {
558 		return_ACPI_STATUS(status);
559 	}
560 
561 	current_obj_desc = acpi_ns_get_attached_object(node);
562 	if (current_obj_desc == obj_desc) {
563 		ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p already installed!\n",
564 				  obj_desc));
565 		return_ACPI_STATUS(status);
566 	}
567 
568 	/*
569 	 * If the reference count on the object is more than one, we must
570 	 * take a copy of the object before we store. A reference count
571 	 * of exactly 1 means that the object was just created during the
572 	 * evaluation of an expression, and we can safely use it since it
573 	 * is not used anywhere else.
574 	 */
575 	new_obj_desc = obj_desc;
576 	if (obj_desc->common.reference_count > 1) {
577 		status =
578 		    acpi_ut_copy_iobject_to_iobject(obj_desc, &new_obj_desc,
579 						    walk_state);
580 		if (ACPI_FAILURE(status)) {
581 			return_ACPI_STATUS(status);
582 		}
583 	}
584 
585 	/*
586 	 * If there is an object already in this slot, we either
587 	 * have to delete it, or if this is an argument and there
588 	 * is an object reference stored there, we have to do
589 	 * an indirect store!
590 	 */
591 	if (current_obj_desc) {
592 		/*
593 		 * Check for an indirect store if an argument
594 		 * contains an object reference (stored as an Node).
595 		 * We don't allow this automatic dereferencing for
596 		 * locals, since a store to a local should overwrite
597 		 * anything there, including an object reference.
598 		 *
599 		 * If both Arg0 and Local0 contain ref_of (Local4):
600 		 *
601 		 * Store (1, Arg0)             - Causes indirect store to local4
602 		 * Store (1, Local0)           - Stores 1 in local0, overwriting
603 		 *                                  the reference to local4
604 		 * Store (1, de_refof (Local0)) - Causes indirect store to local4
605 		 *
606 		 * Weird, but true.
607 		 */
608 		if (type == ACPI_REFCLASS_ARG) {
609 			/*
610 			 * If we have a valid reference object that came from ref_of(),
611 			 * do the indirect store
612 			 */
613 			if ((ACPI_GET_DESCRIPTOR_TYPE(current_obj_desc) ==
614 			     ACPI_DESC_TYPE_OPERAND) &&
615 			    (current_obj_desc->common.type ==
616 			     ACPI_TYPE_LOCAL_REFERENCE) &&
617 			    (current_obj_desc->reference.class ==
618 			     ACPI_REFCLASS_REFOF)) {
619 				ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
620 						  "Arg (%p) is an ObjRef(Node), storing in node %p\n",
621 						  new_obj_desc,
622 						  current_obj_desc));
623 
624 				/*
625 				 * Store this object to the Node (perform the indirect store)
626 				 * NOTE: No implicit conversion is performed, as per the ACPI
627 				 * specification rules on storing to Locals/Args.
628 				 */
629 				status =
630 				    acpi_ex_store_object_to_node(new_obj_desc,
631 								 current_obj_desc->
632 								 reference.
633 								 object,
634 								 walk_state,
635 								 ACPI_NO_IMPLICIT_CONVERSION);
636 
637 				/* Remove local reference if we copied the object above */
638 
639 				if (new_obj_desc != obj_desc) {
640 					acpi_ut_remove_reference(new_obj_desc);
641 				}
642 
643 				return_ACPI_STATUS(status);
644 			}
645 		}
646 
647 		/* Delete the existing object before storing the new one */
648 
649 		acpi_ds_method_data_delete_value(type, index, walk_state);
650 	}
651 
652 	/*
653 	 * Install the Obj descriptor (*new_obj_desc) into
654 	 * the descriptor for the Arg or Local.
655 	 * (increments the object reference count by one)
656 	 */
657 	status =
658 	    acpi_ds_method_data_set_value(type, index, new_obj_desc,
659 					  walk_state);
660 
661 	/* Remove local reference if we copied the object above */
662 
663 	if (new_obj_desc != obj_desc) {
664 		acpi_ut_remove_reference(new_obj_desc);
665 	}
666 
667 	return_ACPI_STATUS(status);
668 }
669 
670 #ifdef ACPI_OBSOLETE_FUNCTIONS
671 /*******************************************************************************
672  *
673  * FUNCTION:    acpi_ds_method_data_get_type
674  *
675  * PARAMETERS:  opcode              - Either AML_FIRST LOCAL_OP or
676  *                                    AML_FIRST_ARG_OP
677  *              index               - Which Local or Arg whose type to get
678  *              walk_state          - Current walk state object
679  *
680  * RETURN:      Data type of current value of the selected Arg or Local
681  *
682  * DESCRIPTION: Get the type of the object stored in the Local or Arg
683  *
684  ******************************************************************************/
685 
686 acpi_object_type
687 acpi_ds_method_data_get_type(u16 opcode,
688 			     u32 index, struct acpi_walk_state *walk_state)
689 {
690 	acpi_status status;
691 	struct acpi_namespace_node *node;
692 	union acpi_operand_object *object;
693 
694 	ACPI_FUNCTION_TRACE(ds_method_data_get_type);
695 
696 	/* Get the namespace node for the arg/local */
697 
698 	status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
699 	if (ACPI_FAILURE(status)) {
700 		return_VALUE((ACPI_TYPE_NOT_FOUND));
701 	}
702 
703 	/* Get the object */
704 
705 	object = acpi_ns_get_attached_object(node);
706 	if (!object) {
707 
708 		/* Uninitialized local/arg, return TYPE_ANY */
709 
710 		return_VALUE(ACPI_TYPE_ANY);
711 	}
712 
713 	/* Get the object type */
714 
715 	return_VALUE(object->type);
716 }
717 #endif
718