Commit | Line | Data |
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1da177e4 LT |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: exresolv - AML Interpreter object resolution | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
75a44ce0 | 9 | * Copyright (C) 2000 - 2008, Intel Corp. |
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; | |
65e4b9b0 | 143 | union acpi_operand_object *obj_desc = NULL; |
4be44fcd | 144 | u16 opcode; |
1da177e4 | 145 | |
b229cf92 | 146 | ACPI_FUNCTION_TRACE(ex_resolve_object_to_value); |
1da177e4 LT |
147 | |
148 | stack_desc = *stack_ptr; | |
149 | ||
150 | /* This is an union acpi_operand_object */ | |
151 | ||
4be44fcd | 152 | switch (ACPI_GET_OBJECT_TYPE(stack_desc)) { |
1da177e4 LT |
153 | case ACPI_TYPE_LOCAL_REFERENCE: |
154 | ||
155 | opcode = stack_desc->reference.opcode; | |
156 | ||
157 | switch (opcode) { | |
1da177e4 LT |
158 | case AML_LOCAL_OP: |
159 | case AML_ARG_OP: | |
160 | ||
161 | /* | |
162 | * Get the local from the method's state info | |
163 | * Note: this increments the local's object reference count | |
164 | */ | |
4be44fcd LB |
165 | status = acpi_ds_method_data_get_value(opcode, |
166 | stack_desc-> | |
167 | reference.offset, | |
168 | walk_state, | |
169 | &obj_desc); | |
170 | if (ACPI_FAILURE(status)) { | |
171 | return_ACPI_STATUS(status); | |
1da177e4 LT |
172 | } |
173 | ||
4be44fcd | 174 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
b229cf92 | 175 | "[Arg/Local %X] ValueObj is %p\n", |
4be44fcd LB |
176 | stack_desc->reference.offset, |
177 | obj_desc)); | |
1da177e4 LT |
178 | |
179 | /* | |
180 | * Now we can delete the original Reference Object and | |
181 | * replace it with the resolved value | |
182 | */ | |
4be44fcd | 183 | acpi_ut_remove_reference(stack_desc); |
1da177e4 LT |
184 | *stack_ptr = obj_desc; |
185 | break; | |
186 | ||
1da177e4 LT |
187 | case AML_INDEX_OP: |
188 | ||
189 | switch (stack_desc->reference.target_type) { | |
190 | case ACPI_TYPE_BUFFER_FIELD: | |
191 | ||
1cb2ef66 | 192 | /* Just return - do not dereference */ |
1da177e4 LT |
193 | break; |
194 | ||
1da177e4 LT |
195 | case ACPI_TYPE_PACKAGE: |
196 | ||
1cb2ef66 | 197 | /* If method call or copy_object - do not dereference */ |
e5bcc811 | 198 | |
1cb2ef66 LM |
199 | if ((walk_state->opcode == |
200 | AML_INT_METHODCALL_OP) | |
201 | || (walk_state->opcode == AML_COPY_OP)) { | |
e5bcc811 LM |
202 | break; |
203 | } | |
204 | ||
1cb2ef66 LM |
205 | /* Otherwise, dereference the package_index to a package element */ |
206 | ||
1da177e4 LT |
207 | obj_desc = *stack_desc->reference.where; |
208 | if (obj_desc) { | |
209 | /* | |
1cb2ef66 | 210 | * Valid object descriptor, copy pointer to return value |
1da177e4 LT |
211 | * (i.e., dereference the package index) |
212 | * Delete the ref object, increment the returned object | |
213 | */ | |
4be44fcd LB |
214 | acpi_ut_remove_reference(stack_desc); |
215 | acpi_ut_add_reference(obj_desc); | |
1da177e4 | 216 | *stack_ptr = obj_desc; |
4be44fcd | 217 | } else { |
1da177e4 | 218 | /* |
1cb2ef66 | 219 | * A NULL object descriptor means an uninitialized element of |
1da177e4 LT |
220 | * the package, can't dereference it |
221 | */ | |
b8e4d893 | 222 | ACPI_ERROR((AE_INFO, |
e5bcc811 | 223 | "Attempt to dereference an Index to NULL package element Idx=%p", |
b8e4d893 | 224 | stack_desc)); |
1da177e4 LT |
225 | status = AE_AML_UNINITIALIZED_ELEMENT; |
226 | } | |
227 | break; | |
228 | ||
1da177e4 LT |
229 | default: |
230 | ||
231 | /* Invalid reference object */ | |
232 | ||
b8e4d893 | 233 | ACPI_ERROR((AE_INFO, |
e5bcc811 | 234 | "Unknown TargetType %X in Index/Reference object %p", |
b8e4d893 BM |
235 | stack_desc->reference.target_type, |
236 | stack_desc)); | |
1da177e4 LT |
237 | status = AE_AML_INTERNAL; |
238 | break; | |
239 | } | |
240 | break; | |
241 | ||
1da177e4 LT |
242 | case AML_REF_OF_OP: |
243 | case AML_DEBUG_OP: | |
244 | case AML_LOAD_OP: | |
245 | ||
1cb2ef66 | 246 | /* Just leave the object as-is, do not dereference */ |
1da177e4 LT |
247 | |
248 | break; | |
249 | ||
4be44fcd | 250 | case AML_INT_NAMEPATH_OP: /* Reference to a named object */ |
44f6c012 | 251 | |
4c90ece2 BM |
252 | /* Dereference the name */ |
253 | ||
254 | if ((stack_desc->reference.node->type == | |
255 | ACPI_TYPE_DEVICE) | |
256 | || (stack_desc->reference.node->type == | |
257 | ACPI_TYPE_THERMAL)) { | |
258 | ||
259 | /* These node types do not have 'real' subobjects */ | |
260 | ||
261 | *stack_ptr = (void *)stack_desc->reference.node; | |
262 | } else { | |
263 | /* Get the object pointed to by the namespace node */ | |
264 | ||
265 | *stack_ptr = | |
266 | (stack_desc->reference.node)->object; | |
267 | acpi_ut_add_reference(*stack_ptr); | |
268 | } | |
44f6c012 | 269 | |
4be44fcd | 270 | acpi_ut_remove_reference(stack_desc); |
44f6c012 | 271 | break; |
1da177e4 LT |
272 | |
273 | default: | |
274 | ||
b8e4d893 BM |
275 | ACPI_ERROR((AE_INFO, |
276 | "Unknown Reference opcode %X (%s) in %p", | |
277 | opcode, acpi_ps_get_opcode_name(opcode), | |
278 | stack_desc)); | |
1da177e4 LT |
279 | status = AE_AML_INTERNAL; |
280 | break; | |
281 | } | |
282 | break; | |
283 | ||
1da177e4 LT |
284 | case ACPI_TYPE_BUFFER: |
285 | ||
4be44fcd | 286 | status = acpi_ds_get_buffer_arguments(stack_desc); |
1da177e4 LT |
287 | break; |
288 | ||
1da177e4 LT |
289 | case ACPI_TYPE_PACKAGE: |
290 | ||
4be44fcd | 291 | status = acpi_ds_get_package_arguments(stack_desc); |
1da177e4 LT |
292 | break; |
293 | ||
1da177e4 LT |
294 | case ACPI_TYPE_BUFFER_FIELD: |
295 | case ACPI_TYPE_LOCAL_REGION_FIELD: | |
296 | case ACPI_TYPE_LOCAL_BANK_FIELD: | |
297 | case ACPI_TYPE_LOCAL_INDEX_FIELD: | |
298 | ||
4be44fcd | 299 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
b229cf92 | 300 | "FieldRead SourceDesc=%p Type=%X\n", |
4be44fcd LB |
301 | stack_desc, |
302 | ACPI_GET_OBJECT_TYPE(stack_desc))); | |
1da177e4 | 303 | |
4be44fcd LB |
304 | status = |
305 | acpi_ex_read_data_from_field(walk_state, stack_desc, | |
306 | &obj_desc); | |
65e4b9b0 FS |
307 | |
308 | /* Remove a reference to the original operand, then override */ | |
309 | ||
310 | acpi_ut_remove_reference(*stack_ptr); | |
4be44fcd | 311 | *stack_ptr = (void *)obj_desc; |
1da177e4 LT |
312 | break; |
313 | ||
314 | default: | |
315 | break; | |
316 | } | |
317 | ||
4be44fcd | 318 | return_ACPI_STATUS(status); |
1da177e4 LT |
319 | } |
320 | ||
1da177e4 LT |
321 | /******************************************************************************* |
322 | * | |
323 | * FUNCTION: acpi_ex_resolve_multiple | |
324 | * | |
325 | * PARAMETERS: walk_state - Current state (contains AML opcode) | |
326 | * Operand - Starting point for resolution | |
327 | * return_type - Where the object type is returned | |
328 | * return_desc - Where the resolved object is returned | |
329 | * | |
330 | * RETURN: Status | |
331 | * | |
332 | * DESCRIPTION: Return the base object and type. Traverse a reference list if | |
333 | * necessary to get to the base object. | |
334 | * | |
335 | ******************************************************************************/ | |
336 | ||
337 | acpi_status | |
4be44fcd LB |
338 | acpi_ex_resolve_multiple(struct acpi_walk_state *walk_state, |
339 | union acpi_operand_object *operand, | |
340 | acpi_object_type * return_type, | |
341 | union acpi_operand_object **return_desc) | |
1da177e4 | 342 | { |
4be44fcd LB |
343 | union acpi_operand_object *obj_desc = (void *)operand; |
344 | struct acpi_namespace_node *node; | |
345 | acpi_object_type type; | |
346 | acpi_status status; | |
1da177e4 | 347 | |
b229cf92 | 348 | ACPI_FUNCTION_TRACE(acpi_ex_resolve_multiple); |
1da177e4 | 349 | |
44f6c012 RM |
350 | /* Operand can be either a namespace node or an operand descriptor */ |
351 | ||
4be44fcd | 352 | switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) { |
1da177e4 LT |
353 | case ACPI_DESC_TYPE_OPERAND: |
354 | type = obj_desc->common.type; | |
355 | break; | |
356 | ||
357 | case ACPI_DESC_TYPE_NAMED: | |
4be44fcd LB |
358 | type = ((struct acpi_namespace_node *)obj_desc)->type; |
359 | obj_desc = | |
360 | acpi_ns_get_attached_object((struct acpi_namespace_node *) | |
361 | obj_desc); | |
1da177e4 LT |
362 | |
363 | /* If we had an Alias node, use the attached object for type info */ | |
364 | ||
365 | if (type == ACPI_TYPE_LOCAL_ALIAS) { | |
4be44fcd LB |
366 | type = ((struct acpi_namespace_node *)obj_desc)->type; |
367 | obj_desc = | |
368 | acpi_ns_get_attached_object((struct | |
369 | acpi_namespace_node *) | |
370 | obj_desc); | |
1da177e4 LT |
371 | } |
372 | break; | |
373 | ||
374 | default: | |
4be44fcd | 375 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 LT |
376 | } |
377 | ||
44f6c012 | 378 | /* If type is anything other than a reference, we are done */ |
1da177e4 | 379 | |
1da177e4 LT |
380 | if (type != ACPI_TYPE_LOCAL_REFERENCE) { |
381 | goto exit; | |
382 | } | |
383 | ||
384 | /* | |
bc7a36ab LM |
385 | * For reference objects created via the ref_of, Index, or Load/load_table |
386 | * operators, we need to get to the base object (as per the ACPI | |
387 | * specification of the object_type and size_of operators). This means | |
388 | * traversing the list of possibly many nested references. | |
1da177e4 | 389 | */ |
4be44fcd | 390 | while (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_REFERENCE) { |
1da177e4 LT |
391 | switch (obj_desc->reference.opcode) { |
392 | case AML_REF_OF_OP: | |
52fc0b02 | 393 | case AML_INT_NAMEPATH_OP: |
1da177e4 LT |
394 | |
395 | /* Dereference the reference pointer */ | |
396 | ||
52fc0b02 BM |
397 | if (obj_desc->reference.opcode == AML_REF_OF_OP) { |
398 | node = obj_desc->reference.object; | |
399 | } else { /* AML_INT_NAMEPATH_OP */ | |
400 | ||
401 | node = obj_desc->reference.node; | |
402 | } | |
1da177e4 LT |
403 | |
404 | /* All "References" point to a NS node */ | |
405 | ||
4be44fcd LB |
406 | if (ACPI_GET_DESCRIPTOR_TYPE(node) != |
407 | ACPI_DESC_TYPE_NAMED) { | |
b8e4d893 BM |
408 | ACPI_ERROR((AE_INFO, "Not a NS node %p [%s]", |
409 | node, | |
410 | acpi_ut_get_descriptor_name(node))); | |
4be44fcd | 411 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
412 | } |
413 | ||
414 | /* Get the attached object */ | |
415 | ||
4be44fcd | 416 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 | 417 | if (!obj_desc) { |
52fc0b02 | 418 | |
1da177e4 LT |
419 | /* No object, use the NS node type */ |
420 | ||
4be44fcd | 421 | type = acpi_ns_get_type(node); |
1da177e4 LT |
422 | goto exit; |
423 | } | |
424 | ||
425 | /* Check for circular references */ | |
426 | ||
427 | if (obj_desc == operand) { | |
4be44fcd | 428 | return_ACPI_STATUS(AE_AML_CIRCULAR_REFERENCE); |
1da177e4 LT |
429 | } |
430 | break; | |
431 | ||
1da177e4 LT |
432 | case AML_INDEX_OP: |
433 | ||
434 | /* Get the type of this reference (index into another object) */ | |
435 | ||
436 | type = obj_desc->reference.target_type; | |
437 | if (type != ACPI_TYPE_PACKAGE) { | |
438 | goto exit; | |
439 | } | |
440 | ||
441 | /* | |
442 | * The main object is a package, we want to get the type | |
443 | * of the individual package element that is referenced by | |
444 | * the index. | |
445 | * | |
446 | * This could of course in turn be another reference object. | |
447 | */ | |
448 | obj_desc = *(obj_desc->reference.where); | |
449 | if (!obj_desc) { | |
52fc0b02 | 450 | |
1da177e4 LT |
451 | /* NULL package elements are allowed */ |
452 | ||
4be44fcd | 453 | type = 0; /* Uninitialized */ |
1da177e4 LT |
454 | goto exit; |
455 | } | |
456 | break; | |
457 | ||
bc7a36ab LM |
458 | case AML_LOAD_OP: |
459 | ||
460 | type = ACPI_TYPE_DDB_HANDLE; | |
461 | goto exit; | |
462 | ||
1da177e4 LT |
463 | case AML_LOCAL_OP: |
464 | case AML_ARG_OP: | |
465 | ||
466 | if (return_desc) { | |
4be44fcd LB |
467 | status = |
468 | acpi_ds_method_data_get_value(obj_desc-> | |
469 | reference. | |
470 | opcode, | |
471 | obj_desc-> | |
472 | reference. | |
473 | offset, | |
474 | walk_state, | |
475 | &obj_desc); | |
476 | if (ACPI_FAILURE(status)) { | |
477 | return_ACPI_STATUS(status); | |
1da177e4 | 478 | } |
4be44fcd LB |
479 | acpi_ut_remove_reference(obj_desc); |
480 | } else { | |
481 | status = | |
482 | acpi_ds_method_data_get_node(obj_desc-> | |
483 | reference. | |
484 | opcode, | |
485 | obj_desc-> | |
486 | reference. | |
487 | offset, | |
488 | walk_state, | |
489 | &node); | |
490 | if (ACPI_FAILURE(status)) { | |
491 | return_ACPI_STATUS(status); | |
1da177e4 LT |
492 | } |
493 | ||
4be44fcd | 494 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 LT |
495 | if (!obj_desc) { |
496 | type = ACPI_TYPE_ANY; | |
497 | goto exit; | |
498 | } | |
499 | } | |
500 | break; | |
501 | ||
1da177e4 LT |
502 | case AML_DEBUG_OP: |
503 | ||
b229cf92 | 504 | /* The Debug Object is of type "DebugObject" */ |
1da177e4 LT |
505 | |
506 | type = ACPI_TYPE_DEBUG_OBJECT; | |
507 | goto exit; | |
508 | ||
1da177e4 LT |
509 | default: |
510 | ||
b8e4d893 BM |
511 | ACPI_ERROR((AE_INFO, |
512 | "Unknown Reference subtype %X", | |
513 | obj_desc->reference.opcode)); | |
4be44fcd | 514 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
515 | } |
516 | } | |
517 | ||
518 | /* | |
519 | * Now we are guaranteed to have an object that has not been created | |
520 | * via the ref_of or Index operators. | |
521 | */ | |
4be44fcd | 522 | type = ACPI_GET_OBJECT_TYPE(obj_desc); |
1da177e4 | 523 | |
4be44fcd | 524 | exit: |
1da177e4 LT |
525 | /* Convert internal types to external types */ |
526 | ||
527 | switch (type) { | |
528 | case ACPI_TYPE_LOCAL_REGION_FIELD: | |
529 | case ACPI_TYPE_LOCAL_BANK_FIELD: | |
530 | case ACPI_TYPE_LOCAL_INDEX_FIELD: | |
531 | ||
532 | type = ACPI_TYPE_FIELD_UNIT; | |
533 | break; | |
534 | ||
535 | case ACPI_TYPE_LOCAL_SCOPE: | |
536 | ||
537 | /* Per ACPI Specification, Scope is untyped */ | |
538 | ||
539 | type = ACPI_TYPE_ANY; | |
540 | break; | |
541 | ||
542 | default: | |
543 | /* No change to Type required */ | |
544 | break; | |
545 | } | |
546 | ||
547 | *return_type = type; | |
548 | if (return_desc) { | |
549 | *return_desc = obj_desc; | |
550 | } | |
4be44fcd | 551 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 552 | } |