Commit | Line | Data |
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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: exresolv - AML Interpreter object resolution | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
c8100dc4 | 8 | * Copyright (C) 2000 - 2016, Intel Corp. |
1da177e4 LT |
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 | ||
1da177e4 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "amlcode.h" | |
47 | #include "acdispat.h" | |
48 | #include "acinterp.h" | |
49 | #include "acnamesp.h" | |
1da177e4 | 50 | |
1da177e4 | 51 | #define _COMPONENT ACPI_EXECUTER |
4be44fcd | 52 | ACPI_MODULE_NAME("exresolv") |
1da177e4 | 53 | |
44f6c012 | 54 | /* Local prototypes */ |
44f6c012 | 55 | static acpi_status |
4be44fcd LB |
56 | acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr, |
57 | struct acpi_walk_state *walk_state); | |
1da177e4 LT |
58 | |
59 | /******************************************************************************* | |
60 | * | |
61 | * FUNCTION: acpi_ex_resolve_to_value | |
62 | * | |
63 | * PARAMETERS: **stack_ptr - Points to entry on obj_stack, which can | |
64 | * be either an (union acpi_operand_object *) | |
65 | * or an acpi_handle. | |
66 | * walk_state - Current method state | |
67 | * | |
68 | * RETURN: Status | |
69 | * | |
70 | * DESCRIPTION: Convert Reference objects to values | |
71 | * | |
72 | ******************************************************************************/ | |
73 | ||
74 | acpi_status | |
4be44fcd LB |
75 | acpi_ex_resolve_to_value(union acpi_operand_object **stack_ptr, |
76 | struct acpi_walk_state *walk_state) | |
1da177e4 | 77 | { |
4be44fcd | 78 | acpi_status status; |
1da177e4 | 79 | |
b229cf92 | 80 | ACPI_FUNCTION_TRACE_PTR(ex_resolve_to_value, stack_ptr); |
1da177e4 LT |
81 | |
82 | if (!stack_ptr || !*stack_ptr) { | |
b8e4d893 | 83 | ACPI_ERROR((AE_INFO, "Internal - null pointer")); |
4be44fcd | 84 | return_ACPI_STATUS(AE_AML_NO_OPERAND); |
1da177e4 LT |
85 | } |
86 | ||
87 | /* | |
88 | * The entity pointed to by the stack_ptr can be either | |
89 | * 1) A valid union acpi_operand_object, or | |
90 | * 2) A struct acpi_namespace_node (named_obj) | |
91 | */ | |
4be44fcd LB |
92 | if (ACPI_GET_DESCRIPTOR_TYPE(*stack_ptr) == ACPI_DESC_TYPE_OPERAND) { |
93 | status = acpi_ex_resolve_object_to_value(stack_ptr, walk_state); | |
94 | if (ACPI_FAILURE(status)) { | |
95 | return_ACPI_STATUS(status); | |
1da177e4 | 96 | } |
44f6c012 RM |
97 | |
98 | if (!*stack_ptr) { | |
b8e4d893 | 99 | ACPI_ERROR((AE_INFO, "Internal - null pointer")); |
4be44fcd | 100 | return_ACPI_STATUS(AE_AML_NO_OPERAND); |
44f6c012 | 101 | } |
1da177e4 LT |
102 | } |
103 | ||
104 | /* | |
105 | * Object on the stack may have changed if acpi_ex_resolve_object_to_value() | |
106 | * was called (i.e., we can't use an _else_ here.) | |
107 | */ | |
4be44fcd LB |
108 | if (ACPI_GET_DESCRIPTOR_TYPE(*stack_ptr) == ACPI_DESC_TYPE_NAMED) { |
109 | status = | |
110 | acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR | |
111 | (struct acpi_namespace_node, | |
112 | stack_ptr), walk_state); | |
113 | if (ACPI_FAILURE(status)) { | |
114 | return_ACPI_STATUS(status); | |
1da177e4 LT |
115 | } |
116 | } | |
117 | ||
4be44fcd LB |
118 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Resolved object %p\n", *stack_ptr)); |
119 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
120 | } |
121 | ||
1da177e4 LT |
122 | /******************************************************************************* |
123 | * | |
124 | * FUNCTION: acpi_ex_resolve_object_to_value | |
125 | * | |
44f6c012 | 126 | * PARAMETERS: stack_ptr - Pointer to an internal object |
1da177e4 LT |
127 | * walk_state - Current method state |
128 | * | |
129 | * RETURN: Status | |
130 | * | |
44f6c012 | 131 | * DESCRIPTION: Retrieve the value from an internal object. The Reference type |
1da177e4 LT |
132 | * uses the associated AML opcode to determine the value. |
133 | * | |
134 | ******************************************************************************/ | |
135 | ||
44f6c012 | 136 | static acpi_status |
4be44fcd LB |
137 | acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr, |
138 | struct acpi_walk_state *walk_state) | |
1da177e4 | 139 | { |
4be44fcd LB |
140 | acpi_status status = AE_OK; |
141 | union acpi_operand_object *stack_desc; | |
65e4b9b0 | 142 | union acpi_operand_object *obj_desc = NULL; |
1044f1f6 | 143 | u8 ref_type; |
1da177e4 | 144 | |
b229cf92 | 145 | ACPI_FUNCTION_TRACE(ex_resolve_object_to_value); |
1da177e4 LT |
146 | |
147 | stack_desc = *stack_ptr; | |
148 | ||
cf48958e | 149 | /* This is an object of type union acpi_operand_object */ |
1da177e4 | 150 | |
3371c19c | 151 | switch (stack_desc->common.type) { |
1da177e4 LT |
152 | case ACPI_TYPE_LOCAL_REFERENCE: |
153 | ||
1044f1f6 | 154 | ref_type = stack_desc->reference.class; |
1da177e4 | 155 | |
1044f1f6 BM |
156 | switch (ref_type) { |
157 | case ACPI_REFCLASS_LOCAL: | |
158 | case ACPI_REFCLASS_ARG: | |
1da177e4 LT |
159 | /* |
160 | * Get the local from the method's state info | |
161 | * Note: this increments the local's object reference count | |
162 | */ | |
1044f1f6 | 163 | status = acpi_ds_method_data_get_value(ref_type, |
4be44fcd | 164 | stack_desc-> |
1044f1f6 | 165 | reference.value, |
4be44fcd LB |
166 | walk_state, |
167 | &obj_desc); | |
168 | if (ACPI_FAILURE(status)) { | |
169 | return_ACPI_STATUS(status); | |
1da177e4 LT |
170 | } |
171 | ||
4be44fcd | 172 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
b229cf92 | 173 | "[Arg/Local %X] ValueObj is %p\n", |
1044f1f6 | 174 | stack_desc->reference.value, |
4be44fcd | 175 | obj_desc)); |
1da177e4 LT |
176 | |
177 | /* | |
178 | * Now we can delete the original Reference Object and | |
179 | * replace it with the resolved value | |
180 | */ | |
4be44fcd | 181 | acpi_ut_remove_reference(stack_desc); |
1da177e4 LT |
182 | *stack_ptr = obj_desc; |
183 | break; | |
184 | ||
1044f1f6 | 185 | case ACPI_REFCLASS_INDEX: |
1da177e4 LT |
186 | |
187 | switch (stack_desc->reference.target_type) { | |
188 | case ACPI_TYPE_BUFFER_FIELD: | |
189 | ||
1cb2ef66 | 190 | /* Just return - do not dereference */ |
1da177e4 LT |
191 | break; |
192 | ||
1da177e4 LT |
193 | case ACPI_TYPE_PACKAGE: |
194 | ||
1cb2ef66 | 195 | /* If method call or copy_object - do not dereference */ |
e5bcc811 | 196 | |
1cb2ef66 LM |
197 | if ((walk_state->opcode == |
198 | AML_INT_METHODCALL_OP) | |
199 | || (walk_state->opcode == AML_COPY_OP)) { | |
e5bcc811 LM |
200 | break; |
201 | } | |
202 | ||
1cb2ef66 LM |
203 | /* Otherwise, dereference the package_index to a package element */ |
204 | ||
1da177e4 LT |
205 | obj_desc = *stack_desc->reference.where; |
206 | if (obj_desc) { | |
207 | /* | |
1cb2ef66 | 208 | * Valid object descriptor, copy pointer to return value |
1da177e4 LT |
209 | * (i.e., dereference the package index) |
210 | * Delete the ref object, increment the returned object | |
211 | */ | |
4be44fcd | 212 | acpi_ut_add_reference(obj_desc); |
1da177e4 | 213 | *stack_ptr = obj_desc; |
4be44fcd | 214 | } else { |
1da177e4 | 215 | /* |
1cb2ef66 | 216 | * A NULL object descriptor means an uninitialized element of |
1da177e4 LT |
217 | * the package, can't dereference it |
218 | */ | |
b8e4d893 | 219 | ACPI_ERROR((AE_INFO, |
1fad8738 BM |
220 | "Attempt to dereference an Index to " |
221 | "NULL package element Idx=%p", | |
b8e4d893 | 222 | stack_desc)); |
1da177e4 LT |
223 | status = AE_AML_UNINITIALIZED_ELEMENT; |
224 | } | |
225 | break; | |
226 | ||
1da177e4 LT |
227 | default: |
228 | ||
229 | /* Invalid reference object */ | |
230 | ||
b8e4d893 | 231 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 232 | "Unknown TargetType 0x%X in Index/Reference object %p", |
b8e4d893 BM |
233 | stack_desc->reference.target_type, |
234 | stack_desc)); | |
1da177e4 LT |
235 | status = AE_AML_INTERNAL; |
236 | break; | |
237 | } | |
238 | break; | |
239 | ||
1044f1f6 BM |
240 | case ACPI_REFCLASS_REFOF: |
241 | case ACPI_REFCLASS_DEBUG: | |
242 | case ACPI_REFCLASS_TABLE: | |
1da177e4 | 243 | |
1cb2ef66 | 244 | /* Just leave the object as-is, do not dereference */ |
1da177e4 LT |
245 | |
246 | break; | |
247 | ||
1044f1f6 | 248 | case ACPI_REFCLASS_NAME: /* Reference to a named object */ |
44f6c012 | 249 | |
4c90ece2 BM |
250 | /* Dereference the name */ |
251 | ||
252 | if ((stack_desc->reference.node->type == | |
253 | ACPI_TYPE_DEVICE) | |
254 | || (stack_desc->reference.node->type == | |
255 | ACPI_TYPE_THERMAL)) { | |
256 | ||
257 | /* These node types do not have 'real' subobjects */ | |
258 | ||
259 | *stack_ptr = (void *)stack_desc->reference.node; | |
260 | } else { | |
261 | /* Get the object pointed to by the namespace node */ | |
262 | ||
263 | *stack_ptr = | |
264 | (stack_desc->reference.node)->object; | |
265 | acpi_ut_add_reference(*stack_ptr); | |
266 | } | |
44f6c012 | 267 | |
4be44fcd | 268 | acpi_ut_remove_reference(stack_desc); |
44f6c012 | 269 | break; |
1da177e4 LT |
270 | |
271 | default: | |
272 | ||
b8e4d893 | 273 | ACPI_ERROR((AE_INFO, |
f6a22b0b BM |
274 | "Unknown Reference type 0x%X in %p", |
275 | ref_type, stack_desc)); | |
1da177e4 LT |
276 | status = AE_AML_INTERNAL; |
277 | break; | |
278 | } | |
279 | break; | |
280 | ||
1da177e4 LT |
281 | case ACPI_TYPE_BUFFER: |
282 | ||
4be44fcd | 283 | status = acpi_ds_get_buffer_arguments(stack_desc); |
1da177e4 LT |
284 | break; |
285 | ||
1da177e4 LT |
286 | case ACPI_TYPE_PACKAGE: |
287 | ||
4be44fcd | 288 | status = acpi_ds_get_package_arguments(stack_desc); |
1da177e4 LT |
289 | break; |
290 | ||
1da177e4 LT |
291 | case ACPI_TYPE_BUFFER_FIELD: |
292 | case ACPI_TYPE_LOCAL_REGION_FIELD: | |
293 | case ACPI_TYPE_LOCAL_BANK_FIELD: | |
294 | case ACPI_TYPE_LOCAL_INDEX_FIELD: | |
295 | ||
4be44fcd | 296 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
b229cf92 | 297 | "FieldRead SourceDesc=%p Type=%X\n", |
3371c19c | 298 | stack_desc, stack_desc->common.type)); |
1da177e4 | 299 | |
4be44fcd LB |
300 | status = |
301 | acpi_ex_read_data_from_field(walk_state, stack_desc, | |
302 | &obj_desc); | |
65e4b9b0 FS |
303 | |
304 | /* Remove a reference to the original operand, then override */ | |
305 | ||
306 | acpi_ut_remove_reference(*stack_ptr); | |
4be44fcd | 307 | *stack_ptr = (void *)obj_desc; |
1da177e4 LT |
308 | break; |
309 | ||
310 | default: | |
1d1ea1b7 | 311 | |
1da177e4 LT |
312 | break; |
313 | } | |
314 | ||
4be44fcd | 315 | return_ACPI_STATUS(status); |
1da177e4 LT |
316 | } |
317 | ||
1da177e4 LT |
318 | /******************************************************************************* |
319 | * | |
320 | * FUNCTION: acpi_ex_resolve_multiple | |
321 | * | |
322 | * PARAMETERS: walk_state - Current state (contains AML opcode) | |
ba494bee | 323 | * operand - Starting point for resolution |
1da177e4 LT |
324 | * return_type - Where the object type is returned |
325 | * return_desc - Where the resolved object is returned | |
326 | * | |
327 | * RETURN: Status | |
328 | * | |
73a3090a | 329 | * DESCRIPTION: Return the base object and type. Traverse a reference list if |
1da177e4 LT |
330 | * necessary to get to the base object. |
331 | * | |
332 | ******************************************************************************/ | |
333 | ||
334 | acpi_status | |
4be44fcd LB |
335 | acpi_ex_resolve_multiple(struct acpi_walk_state *walk_state, |
336 | union acpi_operand_object *operand, | |
f5c1e1c5 | 337 | acpi_object_type *return_type, |
4be44fcd | 338 | union acpi_operand_object **return_desc) |
1da177e4 | 339 | { |
4712f71b BM |
340 | union acpi_operand_object *obj_desc = ACPI_CAST_PTR(void, operand); |
341 | struct acpi_namespace_node *node = | |
342 | ACPI_CAST_PTR(struct acpi_namespace_node, operand); | |
4be44fcd LB |
343 | acpi_object_type type; |
344 | acpi_status status; | |
1da177e4 | 345 | |
b229cf92 | 346 | ACPI_FUNCTION_TRACE(acpi_ex_resolve_multiple); |
1da177e4 | 347 | |
44f6c012 RM |
348 | /* Operand can be either a namespace node or an operand descriptor */ |
349 | ||
4be44fcd | 350 | switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) { |
1da177e4 | 351 | case ACPI_DESC_TYPE_OPERAND: |
1d1ea1b7 | 352 | |
1da177e4 LT |
353 | type = obj_desc->common.type; |
354 | break; | |
355 | ||
356 | case ACPI_DESC_TYPE_NAMED: | |
1d1ea1b7 | 357 | |
4be44fcd | 358 | type = ((struct acpi_namespace_node *)obj_desc)->type; |
4712f71b | 359 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 LT |
360 | |
361 | /* If we had an Alias node, use the attached object for type info */ | |
362 | ||
363 | if (type == ACPI_TYPE_LOCAL_ALIAS) { | |
4be44fcd | 364 | type = ((struct acpi_namespace_node *)obj_desc)->type; |
1fad8738 BM |
365 | obj_desc = acpi_ns_get_attached_object((struct |
366 | acpi_namespace_node | |
367 | *)obj_desc); | |
1da177e4 | 368 | } |
4712f71b BM |
369 | |
370 | if (!obj_desc) { | |
371 | ACPI_ERROR((AE_INFO, | |
372 | "[%4.4s] Node is unresolved or uninitialized", | |
373 | acpi_ut_get_node_name(node))); | |
374 | return_ACPI_STATUS(AE_AML_UNINITIALIZED_NODE); | |
375 | } | |
1da177e4 LT |
376 | break; |
377 | ||
378 | default: | |
4be44fcd | 379 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 LT |
380 | } |
381 | ||
44f6c012 | 382 | /* If type is anything other than a reference, we are done */ |
1da177e4 | 383 | |
1da177e4 LT |
384 | if (type != ACPI_TYPE_LOCAL_REFERENCE) { |
385 | goto exit; | |
386 | } | |
387 | ||
388 | /* | |
bc7a36ab LM |
389 | * For reference objects created via the ref_of, Index, or Load/load_table |
390 | * operators, we need to get to the base object (as per the ACPI | |
391 | * specification of the object_type and size_of operators). This means | |
392 | * traversing the list of possibly many nested references. | |
1da177e4 | 393 | */ |
3371c19c | 394 | while (obj_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) { |
1044f1f6 BM |
395 | switch (obj_desc->reference.class) { |
396 | case ACPI_REFCLASS_REFOF: | |
397 | case ACPI_REFCLASS_NAME: | |
1da177e4 LT |
398 | |
399 | /* Dereference the reference pointer */ | |
400 | ||
1044f1f6 | 401 | if (obj_desc->reference.class == ACPI_REFCLASS_REFOF) { |
52fc0b02 BM |
402 | node = obj_desc->reference.object; |
403 | } else { /* AML_INT_NAMEPATH_OP */ | |
404 | ||
405 | node = obj_desc->reference.node; | |
406 | } | |
1da177e4 LT |
407 | |
408 | /* All "References" point to a NS node */ | |
409 | ||
4be44fcd LB |
410 | if (ACPI_GET_DESCRIPTOR_TYPE(node) != |
411 | ACPI_DESC_TYPE_NAMED) { | |
f6a22b0b BM |
412 | ACPI_ERROR((AE_INFO, |
413 | "Not a namespace node %p [%s]", | |
b8e4d893 BM |
414 | node, |
415 | acpi_ut_get_descriptor_name(node))); | |
4be44fcd | 416 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
417 | } |
418 | ||
419 | /* Get the attached object */ | |
420 | ||
4be44fcd | 421 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 | 422 | if (!obj_desc) { |
52fc0b02 | 423 | |
1da177e4 LT |
424 | /* No object, use the NS node type */ |
425 | ||
4be44fcd | 426 | type = acpi_ns_get_type(node); |
1da177e4 LT |
427 | goto exit; |
428 | } | |
429 | ||
430 | /* Check for circular references */ | |
431 | ||
432 | if (obj_desc == operand) { | |
4be44fcd | 433 | return_ACPI_STATUS(AE_AML_CIRCULAR_REFERENCE); |
1da177e4 LT |
434 | } |
435 | break; | |
436 | ||
1044f1f6 | 437 | case ACPI_REFCLASS_INDEX: |
1da177e4 LT |
438 | |
439 | /* Get the type of this reference (index into another object) */ | |
440 | ||
441 | type = obj_desc->reference.target_type; | |
442 | if (type != ACPI_TYPE_PACKAGE) { | |
443 | goto exit; | |
444 | } | |
445 | ||
446 | /* | |
447 | * The main object is a package, we want to get the type | |
448 | * of the individual package element that is referenced by | |
449 | * the index. | |
450 | * | |
451 | * This could of course in turn be another reference object. | |
452 | */ | |
453 | obj_desc = *(obj_desc->reference.where); | |
454 | if (!obj_desc) { | |
52fc0b02 | 455 | |
1da177e4 LT |
456 | /* NULL package elements are allowed */ |
457 | ||
4be44fcd | 458 | type = 0; /* Uninitialized */ |
1da177e4 LT |
459 | goto exit; |
460 | } | |
461 | break; | |
462 | ||
1044f1f6 | 463 | case ACPI_REFCLASS_TABLE: |
bc7a36ab LM |
464 | |
465 | type = ACPI_TYPE_DDB_HANDLE; | |
466 | goto exit; | |
467 | ||
1044f1f6 BM |
468 | case ACPI_REFCLASS_LOCAL: |
469 | case ACPI_REFCLASS_ARG: | |
1da177e4 LT |
470 | |
471 | if (return_desc) { | |
4be44fcd LB |
472 | status = |
473 | acpi_ds_method_data_get_value(obj_desc-> | |
474 | reference. | |
1044f1f6 | 475 | class, |
4be44fcd LB |
476 | obj_desc-> |
477 | reference. | |
1044f1f6 | 478 | value, |
4be44fcd LB |
479 | walk_state, |
480 | &obj_desc); | |
481 | if (ACPI_FAILURE(status)) { | |
482 | return_ACPI_STATUS(status); | |
1da177e4 | 483 | } |
4be44fcd LB |
484 | acpi_ut_remove_reference(obj_desc); |
485 | } else { | |
486 | status = | |
487 | acpi_ds_method_data_get_node(obj_desc-> | |
488 | reference. | |
1044f1f6 | 489 | class, |
4be44fcd LB |
490 | obj_desc-> |
491 | reference. | |
1044f1f6 | 492 | value, |
4be44fcd LB |
493 | walk_state, |
494 | &node); | |
495 | if (ACPI_FAILURE(status)) { | |
496 | return_ACPI_STATUS(status); | |
1da177e4 LT |
497 | } |
498 | ||
4be44fcd | 499 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 LT |
500 | if (!obj_desc) { |
501 | type = ACPI_TYPE_ANY; | |
502 | goto exit; | |
503 | } | |
504 | } | |
505 | break; | |
506 | ||
1044f1f6 | 507 | case ACPI_REFCLASS_DEBUG: |
1da177e4 | 508 | |
b229cf92 | 509 | /* The Debug Object is of type "DebugObject" */ |
1da177e4 LT |
510 | |
511 | type = ACPI_TYPE_DEBUG_OBJECT; | |
512 | goto exit; | |
513 | ||
1da177e4 LT |
514 | default: |
515 | ||
b8e4d893 | 516 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 517 | "Unknown Reference Class 0x%2.2X", |
1044f1f6 | 518 | obj_desc->reference.class)); |
4be44fcd | 519 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
520 | } |
521 | } | |
522 | ||
523 | /* | |
524 | * Now we are guaranteed to have an object that has not been created | |
525 | * via the ref_of or Index operators. | |
526 | */ | |
3371c19c | 527 | type = obj_desc->common.type; |
1da177e4 | 528 | |
10622bf8 | 529 | exit: |
1da177e4 LT |
530 | /* Convert internal types to external types */ |
531 | ||
532 | switch (type) { | |
533 | case ACPI_TYPE_LOCAL_REGION_FIELD: | |
534 | case ACPI_TYPE_LOCAL_BANK_FIELD: | |
535 | case ACPI_TYPE_LOCAL_INDEX_FIELD: | |
536 | ||
537 | type = ACPI_TYPE_FIELD_UNIT; | |
538 | break; | |
539 | ||
540 | case ACPI_TYPE_LOCAL_SCOPE: | |
541 | ||
542 | /* Per ACPI Specification, Scope is untyped */ | |
543 | ||
544 | type = ACPI_TYPE_ANY; | |
545 | break; | |
546 | ||
547 | default: | |
1d1ea1b7 | 548 | |
1da177e4 | 549 | /* No change to Type required */ |
1d1ea1b7 | 550 | |
1da177e4 LT |
551 | break; |
552 | } | |
553 | ||
554 | *return_type = type; | |
555 | if (return_desc) { | |
556 | *return_desc = obj_desc; | |
557 | } | |
4be44fcd | 558 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 559 | } |