blob: fdd6a7079b975f5e1deed99226dbc5cc25ce219b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001
2/******************************************************************************
3 *
4 * Module Name: exresolv - AML Interpreter object resolution
5 *
6 *****************************************************************************/
7
8/*
Bob Moorea8357b02010-01-22 19:07:36 +08009 * Copyright (C) 2000 - 2010, Intel Corp.
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <acpi/acpi.h>
Len Browne2f7a772009-01-09 00:30:03 -050046#include "accommon.h"
47#include "amlcode.h"
48#include "acdispat.h"
49#include "acinterp.h"
50#include "acnamesp.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#define _COMPONENT ACPI_EXECUTER
Len Brown4be44fc2005-08-05 00:44:28 -040053ACPI_MODULE_NAME("exresolv")
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Robert Moore44f6c012005-04-18 22:49:35 -040055/* Local prototypes */
Robert Moore44f6c012005-04-18 22:49:35 -040056static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -040057acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr,
58 struct acpi_walk_state *walk_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
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
75acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -040076acpi_ex_resolve_to_value(union acpi_operand_object **stack_ptr,
77 struct acpi_walk_state *walk_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
Len Brown4be44fc2005-08-05 00:44:28 -040079 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Bob Mooreb229cf92006-04-21 17:15:00 -040081 ACPI_FUNCTION_TRACE_PTR(ex_resolve_to_value, stack_ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83 if (!stack_ptr || !*stack_ptr) {
Bob Mooreb8e4d892006-01-27 16:43:00 -050084 ACPI_ERROR((AE_INFO, "Internal - null pointer"));
Len Brown4be44fc2005-08-05 00:44:28 -040085 return_ACPI_STATUS(AE_AML_NO_OPERAND);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 }
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 */
Len Brown4be44fc2005-08-05 00:44:28 -040093 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 }
Robert Moore44f6c012005-04-18 22:49:35 -040098
99 if (!*stack_ptr) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500100 ACPI_ERROR((AE_INFO, "Internal - null pointer"));
Len Brown4be44fc2005-08-05 00:44:28 -0400101 return_ACPI_STATUS(AE_AML_NO_OPERAND);
Robert Moore44f6c012005-04-18 22:49:35 -0400102 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 }
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 */
Len Brown4be44fc2005-08-05 00:44:28 -0400109 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 }
117 }
118
Len Brown4be44fc2005-08-05 00:44:28 -0400119 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Resolved object %p\n", *stack_ptr));
120 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121}
122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123/*******************************************************************************
124 *
125 * FUNCTION: acpi_ex_resolve_object_to_value
126 *
Robert Moore44f6c012005-04-18 22:49:35 -0400127 * PARAMETERS: stack_ptr - Pointer to an internal object
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 * walk_state - Current method state
129 *
130 * RETURN: Status
131 *
Robert Moore44f6c012005-04-18 22:49:35 -0400132 * DESCRIPTION: Retrieve the value from an internal object. The Reference type
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 * uses the associated AML opcode to determine the value.
134 *
135 ******************************************************************************/
136
Robert Moore44f6c012005-04-18 22:49:35 -0400137static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400138acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr,
139 struct acpi_walk_state *walk_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140{
Len Brown4be44fc2005-08-05 00:44:28 -0400141 acpi_status status = AE_OK;
142 union acpi_operand_object *stack_desc;
Fiodor Suietov65e4b9b2007-02-02 19:48:21 +0300143 union acpi_operand_object *obj_desc = NULL;
Bob Moore1044f1f2008-09-27 11:08:41 +0800144 u8 ref_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Bob Mooreb229cf92006-04-21 17:15:00 -0400146 ACPI_FUNCTION_TRACE(ex_resolve_object_to_value);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148 stack_desc = *stack_ptr;
149
Frederik Schwarzer0211a9c2008-12-29 22:14:56 +0100150 /* This is a union acpi_operand_object */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Bob Moore3371c192009-02-18 14:44:03 +0800152 switch (stack_desc->common.type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 case ACPI_TYPE_LOCAL_REFERENCE:
154
Bob Moore1044f1f2008-09-27 11:08:41 +0800155 ref_type = stack_desc->reference.class;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
Bob Moore1044f1f2008-09-27 11:08:41 +0800157 switch (ref_type) {
158 case ACPI_REFCLASS_LOCAL:
159 case ACPI_REFCLASS_ARG:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
161 /*
162 * Get the local from the method's state info
163 * Note: this increments the local's object reference count
164 */
Bob Moore1044f1f2008-09-27 11:08:41 +0800165 status = acpi_ds_method_data_get_value(ref_type,
Len Brown4be44fc2005-08-05 00:44:28 -0400166 stack_desc->
Bob Moore1044f1f2008-09-27 11:08:41 +0800167 reference.value,
Len Brown4be44fc2005-08-05 00:44:28 -0400168 walk_state,
169 &obj_desc);
170 if (ACPI_FAILURE(status)) {
171 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 }
173
Len Brown4be44fc2005-08-05 00:44:28 -0400174 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
Bob Mooreb229cf92006-04-21 17:15:00 -0400175 "[Arg/Local %X] ValueObj is %p\n",
Bob Moore1044f1f2008-09-27 11:08:41 +0800176 stack_desc->reference.value,
Len Brown4be44fc2005-08-05 00:44:28 -0400177 obj_desc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
179 /*
180 * Now we can delete the original Reference Object and
181 * replace it with the resolved value
182 */
Len Brown4be44fc2005-08-05 00:44:28 -0400183 acpi_ut_remove_reference(stack_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 *stack_ptr = obj_desc;
185 break;
186
Bob Moore1044f1f2008-09-27 11:08:41 +0800187 case ACPI_REFCLASS_INDEX:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
189 switch (stack_desc->reference.target_type) {
190 case ACPI_TYPE_BUFFER_FIELD:
191
Lin Ming1cb2ef62008-04-10 19:06:41 +0400192 /* Just return - do not dereference */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 break;
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 case ACPI_TYPE_PACKAGE:
196
Lin Ming1cb2ef62008-04-10 19:06:41 +0400197 /* If method call or copy_object - do not dereference */
Lin Minge5bcc812008-04-10 19:06:41 +0400198
Lin Ming1cb2ef62008-04-10 19:06:41 +0400199 if ((walk_state->opcode ==
200 AML_INT_METHODCALL_OP)
201 || (walk_state->opcode == AML_COPY_OP)) {
Lin Minge5bcc812008-04-10 19:06:41 +0400202 break;
203 }
204
Lin Ming1cb2ef62008-04-10 19:06:41 +0400205 /* Otherwise, dereference the package_index to a package element */
206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 obj_desc = *stack_desc->reference.where;
208 if (obj_desc) {
209 /*
Lin Ming1cb2ef62008-04-10 19:06:41 +0400210 * Valid object descriptor, copy pointer to return value
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 * (i.e., dereference the package index)
212 * Delete the ref object, increment the returned object
213 */
Len Brown4be44fc2005-08-05 00:44:28 -0400214 acpi_ut_remove_reference(stack_desc);
215 acpi_ut_add_reference(obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 *stack_ptr = obj_desc;
Len Brown4be44fc2005-08-05 00:44:28 -0400217 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 /*
Lin Ming1cb2ef62008-04-10 19:06:41 +0400219 * A NULL object descriptor means an uninitialized element of
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 * the package, can't dereference it
221 */
Bob Mooreb8e4d892006-01-27 16:43:00 -0500222 ACPI_ERROR((AE_INFO,
Lin Minge5bcc812008-04-10 19:06:41 +0400223 "Attempt to dereference an Index to NULL package element Idx=%p",
Bob Mooreb8e4d892006-01-27 16:43:00 -0500224 stack_desc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 status = AE_AML_UNINITIALIZED_ELEMENT;
226 }
227 break;
228
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 default:
230
231 /* Invalid reference object */
232
Bob Mooreb8e4d892006-01-27 16:43:00 -0500233 ACPI_ERROR((AE_INFO,
Lin Minge5bcc812008-04-10 19:06:41 +0400234 "Unknown TargetType %X in Index/Reference object %p",
Bob Mooreb8e4d892006-01-27 16:43:00 -0500235 stack_desc->reference.target_type,
236 stack_desc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 status = AE_AML_INTERNAL;
238 break;
239 }
240 break;
241
Bob Moore1044f1f2008-09-27 11:08:41 +0800242 case ACPI_REFCLASS_REFOF:
243 case ACPI_REFCLASS_DEBUG:
244 case ACPI_REFCLASS_TABLE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Lin Ming1cb2ef62008-04-10 19:06:41 +0400246 /* Just leave the object as-is, do not dereference */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
248 break;
249
Bob Moore1044f1f2008-09-27 11:08:41 +0800250 case ACPI_REFCLASS_NAME: /* Reference to a named object */
Robert Moore44f6c012005-04-18 22:49:35 -0400251
Bob Moore4c90ece2006-06-08 16:29:00 -0400252 /* Dereference the name */
Robert Moore44f6c012005-04-18 22:49:35 -0400253
Bob Moore4c90ece2006-06-08 16:29:00 -0400254 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 }
269
Len Brown4be44fc2005-08-05 00:44:28 -0400270 acpi_ut_remove_reference(stack_desc);
Robert Moore44f6c012005-04-18 22:49:35 -0400271 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
273 default:
274
Bob Mooreb8e4d892006-01-27 16:43:00 -0500275 ACPI_ERROR((AE_INFO,
Bob Moore1044f1f2008-09-27 11:08:41 +0800276 "Unknown Reference type %X in %p", ref_type,
Bob Mooreb8e4d892006-01-27 16:43:00 -0500277 stack_desc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 status = AE_AML_INTERNAL;
279 break;
280 }
281 break;
282
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 case ACPI_TYPE_BUFFER:
284
Len Brown4be44fc2005-08-05 00:44:28 -0400285 status = acpi_ds_get_buffer_arguments(stack_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 break;
287
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 case ACPI_TYPE_PACKAGE:
289
Len Brown4be44fc2005-08-05 00:44:28 -0400290 status = acpi_ds_get_package_arguments(stack_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 break;
292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 case ACPI_TYPE_BUFFER_FIELD:
294 case ACPI_TYPE_LOCAL_REGION_FIELD:
295 case ACPI_TYPE_LOCAL_BANK_FIELD:
296 case ACPI_TYPE_LOCAL_INDEX_FIELD:
297
Len Brown4be44fc2005-08-05 00:44:28 -0400298 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
Bob Mooreb229cf92006-04-21 17:15:00 -0400299 "FieldRead SourceDesc=%p Type=%X\n",
Bob Moore3371c192009-02-18 14:44:03 +0800300 stack_desc, stack_desc->common.type));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
Len Brown4be44fc2005-08-05 00:44:28 -0400302 status =
303 acpi_ex_read_data_from_field(walk_state, stack_desc,
304 &obj_desc);
Fiodor Suietov65e4b9b2007-02-02 19:48:21 +0300305
306 /* Remove a reference to the original operand, then override */
307
308 acpi_ut_remove_reference(*stack_ptr);
Len Brown4be44fc2005-08-05 00:44:28 -0400309 *stack_ptr = (void *)obj_desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 break;
311
312 default:
313 break;
314 }
315
Len Brown4be44fc2005-08-05 00:44:28 -0400316 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317}
318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319/*******************************************************************************
320 *
321 * FUNCTION: acpi_ex_resolve_multiple
322 *
323 * PARAMETERS: walk_state - Current state (contains AML opcode)
324 * Operand - Starting point for resolution
325 * return_type - Where the object type is returned
326 * return_desc - Where the resolved object is returned
327 *
328 * RETURN: Status
329 *
330 * DESCRIPTION: Return the base object and type. Traverse a reference list if
331 * necessary to get to the base object.
332 *
333 ******************************************************************************/
334
335acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400336acpi_ex_resolve_multiple(struct acpi_walk_state *walk_state,
337 union acpi_operand_object *operand,
338 acpi_object_type * return_type,
339 union acpi_operand_object **return_desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340{
Len Brown4be44fc2005-08-05 00:44:28 -0400341 union acpi_operand_object *obj_desc = (void *)operand;
342 struct acpi_namespace_node *node;
343 acpi_object_type type;
344 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
Bob Mooreb229cf92006-04-21 17:15:00 -0400346 ACPI_FUNCTION_TRACE(acpi_ex_resolve_multiple);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Robert Moore44f6c012005-04-18 22:49:35 -0400348 /* Operand can be either a namespace node or an operand descriptor */
349
Len Brown4be44fc2005-08-05 00:44:28 -0400350 switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 case ACPI_DESC_TYPE_OPERAND:
352 type = obj_desc->common.type;
353 break;
354
355 case ACPI_DESC_TYPE_NAMED:
Len Brown4be44fc2005-08-05 00:44:28 -0400356 type = ((struct acpi_namespace_node *)obj_desc)->type;
357 obj_desc =
358 acpi_ns_get_attached_object((struct acpi_namespace_node *)
359 obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
361 /* If we had an Alias node, use the attached object for type info */
362
363 if (type == ACPI_TYPE_LOCAL_ALIAS) {
Len Brown4be44fc2005-08-05 00:44:28 -0400364 type = ((struct acpi_namespace_node *)obj_desc)->type;
365 obj_desc =
366 acpi_ns_get_attached_object((struct
367 acpi_namespace_node *)
368 obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 }
370 break;
371
372 default:
Len Brown4be44fc2005-08-05 00:44:28 -0400373 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 }
375
Robert Moore44f6c012005-04-18 22:49:35 -0400376 /* If type is anything other than a reference, we are done */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 if (type != ACPI_TYPE_LOCAL_REFERENCE) {
379 goto exit;
380 }
381
382 /*
Lin Mingbc7a36a2008-04-10 19:06:42 +0400383 * For reference objects created via the ref_of, Index, or Load/load_table
384 * operators, we need to get to the base object (as per the ACPI
385 * specification of the object_type and size_of operators). This means
386 * traversing the list of possibly many nested references.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 */
Bob Moore3371c192009-02-18 14:44:03 +0800388 while (obj_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
Bob Moore1044f1f2008-09-27 11:08:41 +0800389 switch (obj_desc->reference.class) {
390 case ACPI_REFCLASS_REFOF:
391 case ACPI_REFCLASS_NAME:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
393 /* Dereference the reference pointer */
394
Bob Moore1044f1f2008-09-27 11:08:41 +0800395 if (obj_desc->reference.class == ACPI_REFCLASS_REFOF) {
Bob Moore52fc0b02006-10-02 00:00:00 -0400396 node = obj_desc->reference.object;
397 } else { /* AML_INT_NAMEPATH_OP */
398
399 node = obj_desc->reference.node;
400 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402 /* All "References" point to a NS node */
403
Len Brown4be44fc2005-08-05 00:44:28 -0400404 if (ACPI_GET_DESCRIPTOR_TYPE(node) !=
405 ACPI_DESC_TYPE_NAMED) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500406 ACPI_ERROR((AE_INFO, "Not a NS node %p [%s]",
407 node,
408 acpi_ut_get_descriptor_name(node)));
Len Brown4be44fc2005-08-05 00:44:28 -0400409 return_ACPI_STATUS(AE_AML_INTERNAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 }
411
412 /* Get the attached object */
413
Len Brown4be44fc2005-08-05 00:44:28 -0400414 obj_desc = acpi_ns_get_attached_object(node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 if (!obj_desc) {
Bob Moore52fc0b02006-10-02 00:00:00 -0400416
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 /* No object, use the NS node type */
418
Len Brown4be44fc2005-08-05 00:44:28 -0400419 type = acpi_ns_get_type(node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 goto exit;
421 }
422
423 /* Check for circular references */
424
425 if (obj_desc == operand) {
Len Brown4be44fc2005-08-05 00:44:28 -0400426 return_ACPI_STATUS(AE_AML_CIRCULAR_REFERENCE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 }
428 break;
429
Bob Moore1044f1f2008-09-27 11:08:41 +0800430 case ACPI_REFCLASS_INDEX:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
432 /* Get the type of this reference (index into another object) */
433
434 type = obj_desc->reference.target_type;
435 if (type != ACPI_TYPE_PACKAGE) {
436 goto exit;
437 }
438
439 /*
440 * The main object is a package, we want to get the type
441 * of the individual package element that is referenced by
442 * the index.
443 *
444 * This could of course in turn be another reference object.
445 */
446 obj_desc = *(obj_desc->reference.where);
447 if (!obj_desc) {
Bob Moore52fc0b02006-10-02 00:00:00 -0400448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 /* NULL package elements are allowed */
450
Len Brown4be44fc2005-08-05 00:44:28 -0400451 type = 0; /* Uninitialized */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 goto exit;
453 }
454 break;
455
Bob Moore1044f1f2008-09-27 11:08:41 +0800456 case ACPI_REFCLASS_TABLE:
Lin Mingbc7a36a2008-04-10 19:06:42 +0400457
458 type = ACPI_TYPE_DDB_HANDLE;
459 goto exit;
460
Bob Moore1044f1f2008-09-27 11:08:41 +0800461 case ACPI_REFCLASS_LOCAL:
462 case ACPI_REFCLASS_ARG:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463
464 if (return_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -0400465 status =
466 acpi_ds_method_data_get_value(obj_desc->
467 reference.
Bob Moore1044f1f2008-09-27 11:08:41 +0800468 class,
Len Brown4be44fc2005-08-05 00:44:28 -0400469 obj_desc->
470 reference.
Bob Moore1044f1f2008-09-27 11:08:41 +0800471 value,
Len Brown4be44fc2005-08-05 00:44:28 -0400472 walk_state,
473 &obj_desc);
474 if (ACPI_FAILURE(status)) {
475 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 }
Len Brown4be44fc2005-08-05 00:44:28 -0400477 acpi_ut_remove_reference(obj_desc);
478 } else {
479 status =
480 acpi_ds_method_data_get_node(obj_desc->
481 reference.
Bob Moore1044f1f2008-09-27 11:08:41 +0800482 class,
Len Brown4be44fc2005-08-05 00:44:28 -0400483 obj_desc->
484 reference.
Bob Moore1044f1f2008-09-27 11:08:41 +0800485 value,
Len Brown4be44fc2005-08-05 00:44:28 -0400486 walk_state,
487 &node);
488 if (ACPI_FAILURE(status)) {
489 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 }
491
Len Brown4be44fc2005-08-05 00:44:28 -0400492 obj_desc = acpi_ns_get_attached_object(node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 if (!obj_desc) {
494 type = ACPI_TYPE_ANY;
495 goto exit;
496 }
497 }
498 break;
499
Bob Moore1044f1f2008-09-27 11:08:41 +0800500 case ACPI_REFCLASS_DEBUG:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
Bob Mooreb229cf92006-04-21 17:15:00 -0400502 /* The Debug Object is of type "DebugObject" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
504 type = ACPI_TYPE_DEBUG_OBJECT;
505 goto exit;
506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 default:
508
Bob Mooreb8e4d892006-01-27 16:43:00 -0500509 ACPI_ERROR((AE_INFO,
Bob Moore1044f1f2008-09-27 11:08:41 +0800510 "Unknown Reference Class %2.2X",
511 obj_desc->reference.class));
Len Brown4be44fc2005-08-05 00:44:28 -0400512 return_ACPI_STATUS(AE_AML_INTERNAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 }
514 }
515
516 /*
517 * Now we are guaranteed to have an object that has not been created
518 * via the ref_of or Index operators.
519 */
Bob Moore3371c192009-02-18 14:44:03 +0800520 type = obj_desc->common.type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Len Brown4be44fc2005-08-05 00:44:28 -0400522 exit:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 /* Convert internal types to external types */
524
525 switch (type) {
526 case ACPI_TYPE_LOCAL_REGION_FIELD:
527 case ACPI_TYPE_LOCAL_BANK_FIELD:
528 case ACPI_TYPE_LOCAL_INDEX_FIELD:
529
530 type = ACPI_TYPE_FIELD_UNIT;
531 break;
532
533 case ACPI_TYPE_LOCAL_SCOPE:
534
535 /* Per ACPI Specification, Scope is untyped */
536
537 type = ACPI_TYPE_ANY;
538 break;
539
540 default:
541 /* No change to Type required */
542 break;
543 }
544
545 *return_type = type;
546 if (return_desc) {
547 *return_desc = obj_desc;
548 }
Len Brown4be44fc2005-08-05 00:44:28 -0400549 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550}