Commit | Line | Data |
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1da177e4 LT |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: exresolv - AML Interpreter object resolution | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
4a90c7e8 | 9 | * Copyright (C) 2000 - 2006, R. Byron Moore |
1da177e4 LT |
10 | * All rights reserved. |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or without | |
13 | * modification, are permitted provided that the following conditions | |
14 | * are met: | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions, and the following disclaimer, | |
17 | * without modification. | |
18 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
19 | * substantially similar to the "NO WARRANTY" disclaimer below | |
20 | * ("Disclaimer") and any redistribution must be conditioned upon | |
21 | * including a substantially similar Disclaimer requirement for further | |
22 | * binary redistribution. | |
23 | * 3. Neither the names of the above-listed copyright holders nor the names | |
24 | * of any contributors may be used to endorse or promote products derived | |
25 | * from this software without specific prior written permission. | |
26 | * | |
27 | * Alternatively, this software may be distributed under the terms of the | |
28 | * GNU General Public License ("GPL") version 2 as published by the Free | |
29 | * Software Foundation. | |
30 | * | |
31 | * NO WARRANTY | |
32 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
33 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
34 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
35 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
36 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
37 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
38 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
39 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
40 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
41 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
42 | * POSSIBILITY OF SUCH DAMAGES. | |
43 | */ | |
44 | ||
1da177e4 LT |
45 | #include <acpi/acpi.h> |
46 | #include <acpi/amlcode.h> | |
47 | #include <acpi/acdispat.h> | |
48 | #include <acpi/acinterp.h> | |
49 | #include <acpi/acnamesp.h> | |
50 | #include <acpi/acparser.h> | |
51 | ||
1da177e4 | 52 | #define _COMPONENT ACPI_EXECUTER |
4be44fcd | 53 | ACPI_MODULE_NAME("exresolv") |
1da177e4 | 54 | |
44f6c012 | 55 | /* Local prototypes */ |
44f6c012 | 56 | static acpi_status |
4be44fcd LB |
57 | acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr, |
58 | struct acpi_walk_state *walk_state); | |
1da177e4 LT |
59 | |
60 | /******************************************************************************* | |
61 | * | |
62 | * FUNCTION: acpi_ex_resolve_to_value | |
63 | * | |
64 | * PARAMETERS: **stack_ptr - Points to entry on obj_stack, which can | |
65 | * be either an (union acpi_operand_object *) | |
66 | * or an acpi_handle. | |
67 | * walk_state - Current method state | |
68 | * | |
69 | * RETURN: Status | |
70 | * | |
71 | * DESCRIPTION: Convert Reference objects to values | |
72 | * | |
73 | ******************************************************************************/ | |
74 | ||
75 | acpi_status | |
4be44fcd LB |
76 | acpi_ex_resolve_to_value(union acpi_operand_object **stack_ptr, |
77 | struct acpi_walk_state *walk_state) | |
1da177e4 | 78 | { |
4be44fcd | 79 | acpi_status status; |
1da177e4 | 80 | |
b229cf92 | 81 | ACPI_FUNCTION_TRACE_PTR(ex_resolve_to_value, stack_ptr); |
1da177e4 LT |
82 | |
83 | if (!stack_ptr || !*stack_ptr) { | |
b8e4d893 | 84 | ACPI_ERROR((AE_INFO, "Internal - null pointer")); |
4be44fcd | 85 | return_ACPI_STATUS(AE_AML_NO_OPERAND); |
1da177e4 LT |
86 | } |
87 | ||
88 | /* | |
89 | * The entity pointed to by the stack_ptr can be either | |
90 | * 1) A valid union acpi_operand_object, or | |
91 | * 2) A struct acpi_namespace_node (named_obj) | |
92 | */ | |
4be44fcd LB |
93 | if (ACPI_GET_DESCRIPTOR_TYPE(*stack_ptr) == ACPI_DESC_TYPE_OPERAND) { |
94 | status = acpi_ex_resolve_object_to_value(stack_ptr, walk_state); | |
95 | if (ACPI_FAILURE(status)) { | |
96 | return_ACPI_STATUS(status); | |
1da177e4 | 97 | } |
44f6c012 RM |
98 | |
99 | if (!*stack_ptr) { | |
b8e4d893 | 100 | ACPI_ERROR((AE_INFO, "Internal - null pointer")); |
4be44fcd | 101 | return_ACPI_STATUS(AE_AML_NO_OPERAND); |
44f6c012 | 102 | } |
1da177e4 LT |
103 | } |
104 | ||
105 | /* | |
106 | * Object on the stack may have changed if acpi_ex_resolve_object_to_value() | |
107 | * was called (i.e., we can't use an _else_ here.) | |
108 | */ | |
4be44fcd LB |
109 | if (ACPI_GET_DESCRIPTOR_TYPE(*stack_ptr) == ACPI_DESC_TYPE_NAMED) { |
110 | status = | |
111 | acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR | |
112 | (struct acpi_namespace_node, | |
113 | stack_ptr), walk_state); | |
114 | if (ACPI_FAILURE(status)) { | |
115 | return_ACPI_STATUS(status); | |
1da177e4 LT |
116 | } |
117 | } | |
118 | ||
4be44fcd LB |
119 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Resolved object %p\n", *stack_ptr)); |
120 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
121 | } |
122 | ||
1da177e4 LT |
123 | /******************************************************************************* |
124 | * | |
125 | * FUNCTION: acpi_ex_resolve_object_to_value | |
126 | * | |
44f6c012 | 127 | * PARAMETERS: stack_ptr - Pointer to an internal object |
1da177e4 LT |
128 | * walk_state - Current method state |
129 | * | |
130 | * RETURN: Status | |
131 | * | |
44f6c012 | 132 | * DESCRIPTION: Retrieve the value from an internal object. The Reference type |
1da177e4 LT |
133 | * uses the associated AML opcode to determine the value. |
134 | * | |
135 | ******************************************************************************/ | |
136 | ||
44f6c012 | 137 | static acpi_status |
4be44fcd LB |
138 | acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr, |
139 | struct acpi_walk_state *walk_state) | |
1da177e4 | 140 | { |
4be44fcd LB |
141 | acpi_status status = AE_OK; |
142 | union acpi_operand_object *stack_desc; | |
143 | void *temp_node; | |
144 | union acpi_operand_object *obj_desc; | |
145 | u16 opcode; | |
1da177e4 | 146 | |
b229cf92 | 147 | ACPI_FUNCTION_TRACE(ex_resolve_object_to_value); |
1da177e4 LT |
148 | |
149 | stack_desc = *stack_ptr; | |
150 | ||
151 | /* This is an union acpi_operand_object */ | |
152 | ||
4be44fcd | 153 | switch (ACPI_GET_OBJECT_TYPE(stack_desc)) { |
1da177e4 LT |
154 | case ACPI_TYPE_LOCAL_REFERENCE: |
155 | ||
156 | opcode = stack_desc->reference.opcode; | |
157 | ||
158 | switch (opcode) { | |
159 | case AML_NAME_OP: | |
160 | ||
161 | /* | |
44f6c012 | 162 | * Convert name reference to a namespace node |
1da177e4 LT |
163 | * Then, acpi_ex_resolve_node_to_value can be used to get the value |
164 | */ | |
165 | temp_node = stack_desc->reference.object; | |
166 | ||
167 | /* Delete the Reference Object */ | |
168 | ||
4be44fcd | 169 | acpi_ut_remove_reference(stack_desc); |
1da177e4 | 170 | |
44f6c012 | 171 | /* Return the namespace node */ |
1da177e4 LT |
172 | |
173 | (*stack_ptr) = temp_node; | |
174 | break; | |
175 | ||
1da177e4 LT |
176 | case AML_LOCAL_OP: |
177 | case AML_ARG_OP: | |
178 | ||
179 | /* | |
180 | * Get the local from the method's state info | |
181 | * Note: this increments the local's object reference count | |
182 | */ | |
4be44fcd LB |
183 | status = acpi_ds_method_data_get_value(opcode, |
184 | stack_desc-> | |
185 | reference.offset, | |
186 | walk_state, | |
187 | &obj_desc); | |
188 | if (ACPI_FAILURE(status)) { | |
189 | return_ACPI_STATUS(status); | |
1da177e4 LT |
190 | } |
191 | ||
4be44fcd | 192 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
b229cf92 | 193 | "[Arg/Local %X] ValueObj is %p\n", |
4be44fcd LB |
194 | stack_desc->reference.offset, |
195 | obj_desc)); | |
1da177e4 LT |
196 | |
197 | /* | |
198 | * Now we can delete the original Reference Object and | |
199 | * replace it with the resolved value | |
200 | */ | |
4be44fcd | 201 | acpi_ut_remove_reference(stack_desc); |
1da177e4 LT |
202 | *stack_ptr = obj_desc; |
203 | break; | |
204 | ||
1da177e4 LT |
205 | case AML_INDEX_OP: |
206 | ||
207 | switch (stack_desc->reference.target_type) { | |
208 | case ACPI_TYPE_BUFFER_FIELD: | |
209 | ||
210 | /* Just return - leave the Reference on the stack */ | |
211 | break; | |
212 | ||
1da177e4 LT |
213 | case ACPI_TYPE_PACKAGE: |
214 | ||
215 | obj_desc = *stack_desc->reference.where; | |
216 | if (obj_desc) { | |
217 | /* | |
218 | * Valid obj descriptor, copy pointer to return value | |
219 | * (i.e., dereference the package index) | |
220 | * Delete the ref object, increment the returned object | |
221 | */ | |
4be44fcd LB |
222 | acpi_ut_remove_reference(stack_desc); |
223 | acpi_ut_add_reference(obj_desc); | |
1da177e4 | 224 | *stack_ptr = obj_desc; |
4be44fcd | 225 | } else { |
1da177e4 LT |
226 | /* |
227 | * A NULL object descriptor means an unitialized element of | |
228 | * the package, can't dereference it | |
229 | */ | |
b8e4d893 BM |
230 | ACPI_ERROR((AE_INFO, |
231 | "Attempt to deref an Index to NULL pkg element Idx=%p", | |
232 | stack_desc)); | |
1da177e4 LT |
233 | status = AE_AML_UNINITIALIZED_ELEMENT; |
234 | } | |
235 | break; | |
236 | ||
1da177e4 LT |
237 | default: |
238 | ||
239 | /* Invalid reference object */ | |
240 | ||
b8e4d893 | 241 | ACPI_ERROR((AE_INFO, |
b229cf92 | 242 | "Unknown TargetType %X in Index/Reference obj %p", |
b8e4d893 BM |
243 | stack_desc->reference.target_type, |
244 | stack_desc)); | |
1da177e4 LT |
245 | status = AE_AML_INTERNAL; |
246 | break; | |
247 | } | |
248 | break; | |
249 | ||
1da177e4 LT |
250 | case AML_REF_OF_OP: |
251 | case AML_DEBUG_OP: | |
252 | case AML_LOAD_OP: | |
253 | ||
254 | /* Just leave the object as-is */ | |
255 | ||
256 | break; | |
257 | ||
4be44fcd | 258 | case AML_INT_NAMEPATH_OP: /* Reference to a named object */ |
44f6c012 | 259 | |
4c90ece2 BM |
260 | /* Dereference the name */ |
261 | ||
262 | if ((stack_desc->reference.node->type == | |
263 | ACPI_TYPE_DEVICE) | |
264 | || (stack_desc->reference.node->type == | |
265 | ACPI_TYPE_THERMAL)) { | |
266 | ||
267 | /* These node types do not have 'real' subobjects */ | |
268 | ||
269 | *stack_ptr = (void *)stack_desc->reference.node; | |
270 | } else { | |
271 | /* Get the object pointed to by the namespace node */ | |
272 | ||
273 | *stack_ptr = | |
274 | (stack_desc->reference.node)->object; | |
275 | acpi_ut_add_reference(*stack_ptr); | |
276 | } | |
44f6c012 | 277 | |
4be44fcd | 278 | acpi_ut_remove_reference(stack_desc); |
44f6c012 | 279 | break; |
1da177e4 LT |
280 | |
281 | default: | |
282 | ||
b8e4d893 BM |
283 | ACPI_ERROR((AE_INFO, |
284 | "Unknown Reference opcode %X (%s) in %p", | |
285 | opcode, acpi_ps_get_opcode_name(opcode), | |
286 | stack_desc)); | |
1da177e4 LT |
287 | status = AE_AML_INTERNAL; |
288 | break; | |
289 | } | |
290 | break; | |
291 | ||
1da177e4 LT |
292 | case ACPI_TYPE_BUFFER: |
293 | ||
4be44fcd | 294 | status = acpi_ds_get_buffer_arguments(stack_desc); |
1da177e4 LT |
295 | break; |
296 | ||
1da177e4 LT |
297 | case ACPI_TYPE_PACKAGE: |
298 | ||
4be44fcd | 299 | status = acpi_ds_get_package_arguments(stack_desc); |
1da177e4 LT |
300 | break; |
301 | ||
4be44fcd | 302 | /* These cases may never happen here, but just in case.. */ |
44f6c012 | 303 | |
1da177e4 LT |
304 | case ACPI_TYPE_BUFFER_FIELD: |
305 | case ACPI_TYPE_LOCAL_REGION_FIELD: | |
306 | case ACPI_TYPE_LOCAL_BANK_FIELD: | |
307 | case ACPI_TYPE_LOCAL_INDEX_FIELD: | |
308 | ||
4be44fcd | 309 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
b229cf92 | 310 | "FieldRead SourceDesc=%p Type=%X\n", |
4be44fcd LB |
311 | stack_desc, |
312 | ACPI_GET_OBJECT_TYPE(stack_desc))); | |
1da177e4 | 313 | |
4be44fcd LB |
314 | status = |
315 | acpi_ex_read_data_from_field(walk_state, stack_desc, | |
316 | &obj_desc); | |
317 | *stack_ptr = (void *)obj_desc; | |
1da177e4 LT |
318 | break; |
319 | ||
320 | default: | |
321 | break; | |
322 | } | |
323 | ||
4be44fcd | 324 | return_ACPI_STATUS(status); |
1da177e4 LT |
325 | } |
326 | ||
1da177e4 LT |
327 | /******************************************************************************* |
328 | * | |
329 | * FUNCTION: acpi_ex_resolve_multiple | |
330 | * | |
331 | * PARAMETERS: walk_state - Current state (contains AML opcode) | |
332 | * Operand - Starting point for resolution | |
333 | * return_type - Where the object type is returned | |
334 | * return_desc - Where the resolved object is returned | |
335 | * | |
336 | * RETURN: Status | |
337 | * | |
338 | * DESCRIPTION: Return the base object and type. Traverse a reference list if | |
339 | * necessary to get to the base object. | |
340 | * | |
341 | ******************************************************************************/ | |
342 | ||
343 | acpi_status | |
4be44fcd LB |
344 | acpi_ex_resolve_multiple(struct acpi_walk_state *walk_state, |
345 | union acpi_operand_object *operand, | |
346 | acpi_object_type * return_type, | |
347 | union acpi_operand_object **return_desc) | |
1da177e4 | 348 | { |
4be44fcd LB |
349 | union acpi_operand_object *obj_desc = (void *)operand; |
350 | struct acpi_namespace_node *node; | |
351 | acpi_object_type type; | |
352 | acpi_status status; | |
1da177e4 | 353 | |
b229cf92 | 354 | ACPI_FUNCTION_TRACE(acpi_ex_resolve_multiple); |
1da177e4 | 355 | |
44f6c012 RM |
356 | /* Operand can be either a namespace node or an operand descriptor */ |
357 | ||
4be44fcd | 358 | switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) { |
1da177e4 LT |
359 | case ACPI_DESC_TYPE_OPERAND: |
360 | type = obj_desc->common.type; | |
361 | break; | |
362 | ||
363 | case ACPI_DESC_TYPE_NAMED: | |
4be44fcd LB |
364 | type = ((struct acpi_namespace_node *)obj_desc)->type; |
365 | obj_desc = | |
366 | acpi_ns_get_attached_object((struct acpi_namespace_node *) | |
367 | obj_desc); | |
1da177e4 LT |
368 | |
369 | /* If we had an Alias node, use the attached object for type info */ | |
370 | ||
371 | if (type == ACPI_TYPE_LOCAL_ALIAS) { | |
4be44fcd LB |
372 | type = ((struct acpi_namespace_node *)obj_desc)->type; |
373 | obj_desc = | |
374 | acpi_ns_get_attached_object((struct | |
375 | acpi_namespace_node *) | |
376 | obj_desc); | |
1da177e4 LT |
377 | } |
378 | break; | |
379 | ||
380 | default: | |
4be44fcd | 381 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 LT |
382 | } |
383 | ||
44f6c012 | 384 | /* If type is anything other than a reference, we are done */ |
1da177e4 | 385 | |
1da177e4 LT |
386 | if (type != ACPI_TYPE_LOCAL_REFERENCE) { |
387 | goto exit; | |
388 | } | |
389 | ||
390 | /* | |
391 | * For reference objects created via the ref_of or Index operators, | |
392 | * we need to get to the base object (as per the ACPI specification | |
393 | * of the object_type and size_of operators). This means traversing | |
394 | * the list of possibly many nested references. | |
395 | */ | |
4be44fcd | 396 | while (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_REFERENCE) { |
1da177e4 LT |
397 | switch (obj_desc->reference.opcode) { |
398 | case AML_REF_OF_OP: | |
52fc0b02 | 399 | case AML_INT_NAMEPATH_OP: |
1da177e4 LT |
400 | |
401 | /* Dereference the reference pointer */ | |
402 | ||
52fc0b02 BM |
403 | if (obj_desc->reference.opcode == AML_REF_OF_OP) { |
404 | node = obj_desc->reference.object; | |
405 | } else { /* AML_INT_NAMEPATH_OP */ | |
406 | ||
407 | node = obj_desc->reference.node; | |
408 | } | |
1da177e4 LT |
409 | |
410 | /* All "References" point to a NS node */ | |
411 | ||
4be44fcd LB |
412 | if (ACPI_GET_DESCRIPTOR_TYPE(node) != |
413 | ACPI_DESC_TYPE_NAMED) { | |
b8e4d893 BM |
414 | ACPI_ERROR((AE_INFO, "Not a NS node %p [%s]", |
415 | node, | |
416 | acpi_ut_get_descriptor_name(node))); | |
4be44fcd | 417 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
418 | } |
419 | ||
420 | /* Get the attached object */ | |
421 | ||
4be44fcd | 422 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 | 423 | if (!obj_desc) { |
52fc0b02 | 424 | |
1da177e4 LT |
425 | /* No object, use the NS node type */ |
426 | ||
4be44fcd | 427 | type = acpi_ns_get_type(node); |
1da177e4 LT |
428 | goto exit; |
429 | } | |
430 | ||
431 | /* Check for circular references */ | |
432 | ||
433 | if (obj_desc == operand) { | |
4be44fcd | 434 | return_ACPI_STATUS(AE_AML_CIRCULAR_REFERENCE); |
1da177e4 LT |
435 | } |
436 | break; | |
437 | ||
1da177e4 LT |
438 | case AML_INDEX_OP: |
439 | ||
440 | /* Get the type of this reference (index into another object) */ | |
441 | ||
442 | type = obj_desc->reference.target_type; | |
443 | if (type != ACPI_TYPE_PACKAGE) { | |
444 | goto exit; | |
445 | } | |
446 | ||
447 | /* | |
448 | * The main object is a package, we want to get the type | |
449 | * of the individual package element that is referenced by | |
450 | * the index. | |
451 | * | |
452 | * This could of course in turn be another reference object. | |
453 | */ | |
454 | obj_desc = *(obj_desc->reference.where); | |
455 | if (!obj_desc) { | |
52fc0b02 | 456 | |
1da177e4 LT |
457 | /* NULL package elements are allowed */ |
458 | ||
4be44fcd | 459 | type = 0; /* Uninitialized */ |
1da177e4 LT |
460 | goto exit; |
461 | } | |
462 | break; | |
463 | ||
1da177e4 LT |
464 | case AML_LOCAL_OP: |
465 | case AML_ARG_OP: | |
466 | ||
467 | if (return_desc) { | |
4be44fcd LB |
468 | status = |
469 | acpi_ds_method_data_get_value(obj_desc-> | |
470 | reference. | |
471 | opcode, | |
472 | obj_desc-> | |
473 | reference. | |
474 | offset, | |
475 | walk_state, | |
476 | &obj_desc); | |
477 | if (ACPI_FAILURE(status)) { | |
478 | return_ACPI_STATUS(status); | |
1da177e4 | 479 | } |
4be44fcd LB |
480 | acpi_ut_remove_reference(obj_desc); |
481 | } else { | |
482 | status = | |
483 | acpi_ds_method_data_get_node(obj_desc-> | |
484 | reference. | |
485 | opcode, | |
486 | obj_desc-> | |
487 | reference. | |
488 | offset, | |
489 | walk_state, | |
490 | &node); | |
491 | if (ACPI_FAILURE(status)) { | |
492 | return_ACPI_STATUS(status); | |
1da177e4 LT |
493 | } |
494 | ||
4be44fcd | 495 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 LT |
496 | if (!obj_desc) { |
497 | type = ACPI_TYPE_ANY; | |
498 | goto exit; | |
499 | } | |
500 | } | |
501 | break; | |
502 | ||
1da177e4 LT |
503 | case AML_DEBUG_OP: |
504 | ||
b229cf92 | 505 | /* The Debug Object is of type "DebugObject" */ |
1da177e4 LT |
506 | |
507 | type = ACPI_TYPE_DEBUG_OBJECT; | |
508 | goto exit; | |
509 | ||
1da177e4 LT |
510 | default: |
511 | ||
b8e4d893 BM |
512 | ACPI_ERROR((AE_INFO, |
513 | "Unknown Reference subtype %X", | |
514 | obj_desc->reference.opcode)); | |
4be44fcd | 515 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
516 | } |
517 | } | |
518 | ||
519 | /* | |
520 | * Now we are guaranteed to have an object that has not been created | |
521 | * via the ref_of or Index operators. | |
522 | */ | |
4be44fcd | 523 | type = ACPI_GET_OBJECT_TYPE(obj_desc); |
1da177e4 | 524 | |
4be44fcd | 525 | exit: |
1da177e4 LT |
526 | /* Convert internal types to external types */ |
527 | ||
528 | switch (type) { | |
529 | case ACPI_TYPE_LOCAL_REGION_FIELD: | |
530 | case ACPI_TYPE_LOCAL_BANK_FIELD: | |
531 | case ACPI_TYPE_LOCAL_INDEX_FIELD: | |
532 | ||
533 | type = ACPI_TYPE_FIELD_UNIT; | |
534 | break; | |
535 | ||
536 | case ACPI_TYPE_LOCAL_SCOPE: | |
537 | ||
538 | /* Per ACPI Specification, Scope is untyped */ | |
539 | ||
540 | type = ACPI_TYPE_ANY; | |
541 | break; | |
542 | ||
543 | default: | |
544 | /* No change to Type required */ | |
545 | break; | |
546 | } | |
547 | ||
548 | *return_type = type; | |
549 | if (return_desc) { | |
550 | *return_desc = obj_desc; | |
551 | } | |
4be44fcd | 552 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 553 | } |