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1
2/******************************************************************************
3 *
4 * Module Name: exresolv - AML Interpreter object resolution
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2011, Intel Corp.
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
45#include <acpi/acpi.h>
46#include "accommon.h"
47#include "amlcode.h"
48#include "acdispat.h"
49#include "acinterp.h"
50#include "acnamesp.h"
51
52#define _COMPONENT ACPI_EXECUTER
53ACPI_MODULE_NAME("exresolv")
54
55/* Local prototypes */
56static acpi_status
57acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr,
58 struct acpi_walk_state *walk_state);
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
75acpi_status
76acpi_ex_resolve_to_value(union acpi_operand_object **stack_ptr,
77 struct acpi_walk_state *walk_state)
78{
79 acpi_status status;
80
81 ACPI_FUNCTION_TRACE_PTR(ex_resolve_to_value, stack_ptr);
82
83 if (!stack_ptr || !*stack_ptr) {
84 ACPI_ERROR((AE_INFO, "Internal - null pointer"));
85 return_ACPI_STATUS(AE_AML_NO_OPERAND);
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 */
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);
97 }
98
99 if (!*stack_ptr) {
100 ACPI_ERROR((AE_INFO, "Internal - null pointer"));
101 return_ACPI_STATUS(AE_AML_NO_OPERAND);
102 }
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 */
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);
116 }
117 }
118
119 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Resolved object %p\n", *stack_ptr));
120 return_ACPI_STATUS(AE_OK);
121}
122
123/*******************************************************************************
124 *
125 * FUNCTION: acpi_ex_resolve_object_to_value
126 *
127 * PARAMETERS: stack_ptr - Pointer to an internal object
128 * walk_state - Current method state
129 *
130 * RETURN: Status
131 *
132 * DESCRIPTION: Retrieve the value from an internal object. The Reference type
133 * uses the associated AML opcode to determine the value.
134 *
135 ******************************************************************************/
136
137static acpi_status
138acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr,
139 struct acpi_walk_state *walk_state)
140{
141 acpi_status status = AE_OK;
142 union acpi_operand_object *stack_desc;
143 union acpi_operand_object *obj_desc = NULL;
144 u8 ref_type;
145
146 ACPI_FUNCTION_TRACE(ex_resolve_object_to_value);
147
148 stack_desc = *stack_ptr;
149
150 /* This is a union acpi_operand_object */
151
152 switch (stack_desc->common.type) {
153 case ACPI_TYPE_LOCAL_REFERENCE:
154
155 ref_type = stack_desc->reference.class;
156
157 switch (ref_type) {
158 case ACPI_REFCLASS_LOCAL:
159 case ACPI_REFCLASS_ARG:
160
161 /*
162 * Get the local from the method's state info
163 * Note: this increments the local's object reference count
164 */
165 status = acpi_ds_method_data_get_value(ref_type,
166 stack_desc->
167 reference.value,
168 walk_state,
169 &obj_desc);
170 if (ACPI_FAILURE(status)) {
171 return_ACPI_STATUS(status);
172 }
173
174 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
175 "[Arg/Local %X] ValueObj is %p\n",
176 stack_desc->reference.value,
177 obj_desc));
178
179 /*
180 * Now we can delete the original Reference Object and
181 * replace it with the resolved value
182 */
183 acpi_ut_remove_reference(stack_desc);
184 *stack_ptr = obj_desc;
185 break;
186
187 case ACPI_REFCLASS_INDEX:
188
189 switch (stack_desc->reference.target_type) {
190 case ACPI_TYPE_BUFFER_FIELD:
191
192 /* Just return - do not dereference */
193 break;
194
195 case ACPI_TYPE_PACKAGE:
196
197 /* If method call or copy_object - do not dereference */
198
199 if ((walk_state->opcode ==
200 AML_INT_METHODCALL_OP)
201 || (walk_state->opcode == AML_COPY_OP)) {
202 break;
203 }
204
205 /* Otherwise, dereference the package_index to a package element */
206
207 obj_desc = *stack_desc->reference.where;
208 if (obj_desc) {
209 /*
210 * Valid object descriptor, copy pointer to return value
211 * (i.e., dereference the package index)
212 * Delete the ref object, increment the returned object
213 */
214 acpi_ut_remove_reference(stack_desc);
215 acpi_ut_add_reference(obj_desc);
216 *stack_ptr = obj_desc;
217 } else {
218 /*
219 * A NULL object descriptor means an uninitialized element of
220 * the package, can't dereference it
221 */
222 ACPI_ERROR((AE_INFO,
223 "Attempt to dereference an Index to NULL package element Idx=%p",
224 stack_desc));
225 status = AE_AML_UNINITIALIZED_ELEMENT;
226 }
227 break;
228
229 default:
230
231 /* Invalid reference object */
232
233 ACPI_ERROR((AE_INFO,
234 "Unknown TargetType 0x%X in Index/Reference object %p",
235 stack_desc->reference.target_type,
236 stack_desc));
237 status = AE_AML_INTERNAL;
238 break;
239 }
240 break;
241
242 case ACPI_REFCLASS_REFOF:
243 case ACPI_REFCLASS_DEBUG:
244 case ACPI_REFCLASS_TABLE:
245
246 /* Just leave the object as-is, do not dereference */
247
248 break;
249
250 case ACPI_REFCLASS_NAME: /* Reference to a named object */
251
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 }
269
270 acpi_ut_remove_reference(stack_desc);
271 break;
272
273 default:
274
275 ACPI_ERROR((AE_INFO,
276 "Unknown Reference type 0x%X in %p",
277 ref_type, stack_desc));
278 status = AE_AML_INTERNAL;
279 break;
280 }
281 break;
282
283 case ACPI_TYPE_BUFFER:
284
285 status = acpi_ds_get_buffer_arguments(stack_desc);
286 break;
287
288 case ACPI_TYPE_PACKAGE:
289
290 status = acpi_ds_get_package_arguments(stack_desc);
291 break;
292
293 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
298 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
299 "FieldRead SourceDesc=%p Type=%X\n",
300 stack_desc, stack_desc->common.type));
301
302 status =
303 acpi_ex_read_data_from_field(walk_state, stack_desc,
304 &obj_desc);
305
306 /* Remove a reference to the original operand, then override */
307
308 acpi_ut_remove_reference(*stack_ptr);
309 *stack_ptr = (void *)obj_desc;
310 break;
311
312 default:
313 break;
314 }
315
316 return_ACPI_STATUS(status);
317}
318
319/*******************************************************************************
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
336acpi_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)
340{
341 union acpi_operand_object *obj_desc = (void *)operand;
342 struct acpi_namespace_node *node;
343 acpi_object_type type;
344 acpi_status status;
345
346 ACPI_FUNCTION_TRACE(acpi_ex_resolve_multiple);
347
348 /* Operand can be either a namespace node or an operand descriptor */
349
350 switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) {
351 case ACPI_DESC_TYPE_OPERAND:
352 type = obj_desc->common.type;
353 break;
354
355 case ACPI_DESC_TYPE_NAMED:
356 type = ((struct acpi_namespace_node *)obj_desc)->type;
357 obj_desc =
358 acpi_ns_get_attached_object((struct acpi_namespace_node *)
359 obj_desc);
360
361 /* If we had an Alias node, use the attached object for type info */
362
363 if (type == ACPI_TYPE_LOCAL_ALIAS) {
364 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);
369 }
370 break;
371
372 default:
373 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
374 }
375
376 /* If type is anything other than a reference, we are done */
377
378 if (type != ACPI_TYPE_LOCAL_REFERENCE) {
379 goto exit;
380 }
381
382 /*
383 * 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.
387 */
388 while (obj_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
389 switch (obj_desc->reference.class) {
390 case ACPI_REFCLASS_REFOF:
391 case ACPI_REFCLASS_NAME:
392
393 /* Dereference the reference pointer */
394
395 if (obj_desc->reference.class == ACPI_REFCLASS_REFOF) {
396 node = obj_desc->reference.object;
397 } else { /* AML_INT_NAMEPATH_OP */
398
399 node = obj_desc->reference.node;
400 }
401
402 /* All "References" point to a NS node */
403
404 if (ACPI_GET_DESCRIPTOR_TYPE(node) !=
405 ACPI_DESC_TYPE_NAMED) {
406 ACPI_ERROR((AE_INFO,
407 "Not a namespace node %p [%s]",
408 node,
409 acpi_ut_get_descriptor_name(node)));
410 return_ACPI_STATUS(AE_AML_INTERNAL);
411 }
412
413 /* Get the attached object */
414
415 obj_desc = acpi_ns_get_attached_object(node);
416 if (!obj_desc) {
417
418 /* No object, use the NS node type */
419
420 type = acpi_ns_get_type(node);
421 goto exit;
422 }
423
424 /* Check for circular references */
425
426 if (obj_desc == operand) {
427 return_ACPI_STATUS(AE_AML_CIRCULAR_REFERENCE);
428 }
429 break;
430
431 case ACPI_REFCLASS_INDEX:
432
433 /* Get the type of this reference (index into another object) */
434
435 type = obj_desc->reference.target_type;
436 if (type != ACPI_TYPE_PACKAGE) {
437 goto exit;
438 }
439
440 /*
441 * The main object is a package, we want to get the type
442 * of the individual package element that is referenced by
443 * the index.
444 *
445 * This could of course in turn be another reference object.
446 */
447 obj_desc = *(obj_desc->reference.where);
448 if (!obj_desc) {
449
450 /* NULL package elements are allowed */
451
452 type = 0; /* Uninitialized */
453 goto exit;
454 }
455 break;
456
457 case ACPI_REFCLASS_TABLE:
458
459 type = ACPI_TYPE_DDB_HANDLE;
460 goto exit;
461
462 case ACPI_REFCLASS_LOCAL:
463 case ACPI_REFCLASS_ARG:
464
465 if (return_desc) {
466 status =
467 acpi_ds_method_data_get_value(obj_desc->
468 reference.
469 class,
470 obj_desc->
471 reference.
472 value,
473 walk_state,
474 &obj_desc);
475 if (ACPI_FAILURE(status)) {
476 return_ACPI_STATUS(status);
477 }
478 acpi_ut_remove_reference(obj_desc);
479 } else {
480 status =
481 acpi_ds_method_data_get_node(obj_desc->
482 reference.
483 class,
484 obj_desc->
485 reference.
486 value,
487 walk_state,
488 &node);
489 if (ACPI_FAILURE(status)) {
490 return_ACPI_STATUS(status);
491 }
492
493 obj_desc = acpi_ns_get_attached_object(node);
494 if (!obj_desc) {
495 type = ACPI_TYPE_ANY;
496 goto exit;
497 }
498 }
499 break;
500
501 case ACPI_REFCLASS_DEBUG:
502
503 /* The Debug Object is of type "DebugObject" */
504
505 type = ACPI_TYPE_DEBUG_OBJECT;
506 goto exit;
507
508 default:
509
510 ACPI_ERROR((AE_INFO,
511 "Unknown Reference Class 0x%2.2X",
512 obj_desc->reference.class));
513 return_ACPI_STATUS(AE_AML_INTERNAL);
514 }
515 }
516
517 /*
518 * Now we are guaranteed to have an object that has not been created
519 * via the ref_of or Index operators.
520 */
521 type = obj_desc->common.type;
522
523 exit:
524 /* Convert internal types to external types */
525
526 switch (type) {
527 case ACPI_TYPE_LOCAL_REGION_FIELD:
528 case ACPI_TYPE_LOCAL_BANK_FIELD:
529 case ACPI_TYPE_LOCAL_INDEX_FIELD:
530
531 type = ACPI_TYPE_FIELD_UNIT;
532 break;
533
534 case ACPI_TYPE_LOCAL_SCOPE:
535
536 /* Per ACPI Specification, Scope is untyped */
537
538 type = ACPI_TYPE_ANY;
539 break;
540
541 default:
542 /* No change to Type required */
543 break;
544 }
545
546 *return_type = type;
547 if (return_desc) {
548 *return_desc = obj_desc;
549 }
550 return_ACPI_STATUS(AE_OK);
551}
1/******************************************************************************
2 *
3 * Module Name: exresolv - AML Interpreter object resolution
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2016, 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 "amlcode.h"
47#include "acdispat.h"
48#include "acinterp.h"
49#include "acnamesp.h"
50
51#define _COMPONENT ACPI_EXECUTER
52ACPI_MODULE_NAME("exresolv")
53
54/* Local prototypes */
55static acpi_status
56acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr,
57 struct acpi_walk_state *walk_state);
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
74acpi_status
75acpi_ex_resolve_to_value(union acpi_operand_object **stack_ptr,
76 struct acpi_walk_state *walk_state)
77{
78 acpi_status status;
79
80 ACPI_FUNCTION_TRACE_PTR(ex_resolve_to_value, stack_ptr);
81
82 if (!stack_ptr || !*stack_ptr) {
83 ACPI_ERROR((AE_INFO, "Internal - null pointer"));
84 return_ACPI_STATUS(AE_AML_NO_OPERAND);
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 */
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);
96 }
97
98 if (!*stack_ptr) {
99 ACPI_ERROR((AE_INFO, "Internal - null pointer"));
100 return_ACPI_STATUS(AE_AML_NO_OPERAND);
101 }
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 */
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);
115 }
116 }
117
118 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Resolved object %p\n", *stack_ptr));
119 return_ACPI_STATUS(AE_OK);
120}
121
122/*******************************************************************************
123 *
124 * FUNCTION: acpi_ex_resolve_object_to_value
125 *
126 * PARAMETERS: stack_ptr - Pointer to an internal object
127 * walk_state - Current method state
128 *
129 * RETURN: Status
130 *
131 * DESCRIPTION: Retrieve the value from an internal object. The Reference type
132 * uses the associated AML opcode to determine the value.
133 *
134 ******************************************************************************/
135
136static acpi_status
137acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr,
138 struct acpi_walk_state *walk_state)
139{
140 acpi_status status = AE_OK;
141 union acpi_operand_object *stack_desc;
142 union acpi_operand_object *obj_desc = NULL;
143 u8 ref_type;
144
145 ACPI_FUNCTION_TRACE(ex_resolve_object_to_value);
146
147 stack_desc = *stack_ptr;
148
149 /* This is an object of type union acpi_operand_object */
150
151 switch (stack_desc->common.type) {
152 case ACPI_TYPE_LOCAL_REFERENCE:
153
154 ref_type = stack_desc->reference.class;
155
156 switch (ref_type) {
157 case ACPI_REFCLASS_LOCAL:
158 case ACPI_REFCLASS_ARG:
159 /*
160 * Get the local from the method's state info
161 * Note: this increments the local's object reference count
162 */
163 status = acpi_ds_method_data_get_value(ref_type,
164 stack_desc->
165 reference.value,
166 walk_state,
167 &obj_desc);
168 if (ACPI_FAILURE(status)) {
169 return_ACPI_STATUS(status);
170 }
171
172 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
173 "[Arg/Local %X] ValueObj is %p\n",
174 stack_desc->reference.value,
175 obj_desc));
176
177 /*
178 * Now we can delete the original Reference Object and
179 * replace it with the resolved value
180 */
181 acpi_ut_remove_reference(stack_desc);
182 *stack_ptr = obj_desc;
183 break;
184
185 case ACPI_REFCLASS_INDEX:
186
187 switch (stack_desc->reference.target_type) {
188 case ACPI_TYPE_BUFFER_FIELD:
189
190 /* Just return - do not dereference */
191 break;
192
193 case ACPI_TYPE_PACKAGE:
194
195 /* If method call or copy_object - do not dereference */
196
197 if ((walk_state->opcode ==
198 AML_INT_METHODCALL_OP)
199 || (walk_state->opcode == AML_COPY_OP)) {
200 break;
201 }
202
203 /* Otherwise, dereference the package_index to a package element */
204
205 obj_desc = *stack_desc->reference.where;
206 if (obj_desc) {
207 /*
208 * Valid object descriptor, copy pointer to return value
209 * (i.e., dereference the package index)
210 * Delete the ref object, increment the returned object
211 */
212 acpi_ut_add_reference(obj_desc);
213 *stack_ptr = obj_desc;
214 } else {
215 /*
216 * A NULL object descriptor means an uninitialized element of
217 * the package, can't dereference it
218 */
219 ACPI_ERROR((AE_INFO,
220 "Attempt to dereference an Index to "
221 "NULL package element Idx=%p",
222 stack_desc));
223 status = AE_AML_UNINITIALIZED_ELEMENT;
224 }
225 break;
226
227 default:
228
229 /* Invalid reference object */
230
231 ACPI_ERROR((AE_INFO,
232 "Unknown TargetType 0x%X in Index/Reference object %p",
233 stack_desc->reference.target_type,
234 stack_desc));
235 status = AE_AML_INTERNAL;
236 break;
237 }
238 break;
239
240 case ACPI_REFCLASS_REFOF:
241 case ACPI_REFCLASS_DEBUG:
242 case ACPI_REFCLASS_TABLE:
243
244 /* Just leave the object as-is, do not dereference */
245
246 break;
247
248 case ACPI_REFCLASS_NAME: /* Reference to a named object */
249
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 }
267
268 acpi_ut_remove_reference(stack_desc);
269 break;
270
271 default:
272
273 ACPI_ERROR((AE_INFO,
274 "Unknown Reference type 0x%X in %p",
275 ref_type, stack_desc));
276 status = AE_AML_INTERNAL;
277 break;
278 }
279 break;
280
281 case ACPI_TYPE_BUFFER:
282
283 status = acpi_ds_get_buffer_arguments(stack_desc);
284 break;
285
286 case ACPI_TYPE_PACKAGE:
287
288 status = acpi_ds_get_package_arguments(stack_desc);
289 break;
290
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
296 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
297 "FieldRead SourceDesc=%p Type=%X\n",
298 stack_desc, stack_desc->common.type));
299
300 status =
301 acpi_ex_read_data_from_field(walk_state, stack_desc,
302 &obj_desc);
303
304 /* Remove a reference to the original operand, then override */
305
306 acpi_ut_remove_reference(*stack_ptr);
307 *stack_ptr = (void *)obj_desc;
308 break;
309
310 default:
311
312 break;
313 }
314
315 return_ACPI_STATUS(status);
316}
317
318/*******************************************************************************
319 *
320 * FUNCTION: acpi_ex_resolve_multiple
321 *
322 * PARAMETERS: walk_state - Current state (contains AML opcode)
323 * operand - Starting point for resolution
324 * return_type - Where the object type is returned
325 * return_desc - Where the resolved object is returned
326 *
327 * RETURN: Status
328 *
329 * DESCRIPTION: Return the base object and type. Traverse a reference list if
330 * necessary to get to the base object.
331 *
332 ******************************************************************************/
333
334acpi_status
335acpi_ex_resolve_multiple(struct acpi_walk_state *walk_state,
336 union acpi_operand_object *operand,
337 acpi_object_type * return_type,
338 union acpi_operand_object **return_desc)
339{
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);
343 acpi_object_type type;
344 acpi_status status;
345
346 ACPI_FUNCTION_TRACE(acpi_ex_resolve_multiple);
347
348 /* Operand can be either a namespace node or an operand descriptor */
349
350 switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) {
351 case ACPI_DESC_TYPE_OPERAND:
352
353 type = obj_desc->common.type;
354 break;
355
356 case ACPI_DESC_TYPE_NAMED:
357
358 type = ((struct acpi_namespace_node *)obj_desc)->type;
359 obj_desc = acpi_ns_get_attached_object(node);
360
361 /* If we had an Alias node, use the attached object for type info */
362
363 if (type == ACPI_TYPE_LOCAL_ALIAS) {
364 type = ((struct acpi_namespace_node *)obj_desc)->type;
365 obj_desc = acpi_ns_get_attached_object((struct
366 acpi_namespace_node
367 *)obj_desc);
368 }
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 }
376 break;
377
378 default:
379 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
380 }
381
382 /* If type is anything other than a reference, we are done */
383
384 if (type != ACPI_TYPE_LOCAL_REFERENCE) {
385 goto exit;
386 }
387
388 /*
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.
393 */
394 while (obj_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
395 switch (obj_desc->reference.class) {
396 case ACPI_REFCLASS_REFOF:
397 case ACPI_REFCLASS_NAME:
398
399 /* Dereference the reference pointer */
400
401 if (obj_desc->reference.class == ACPI_REFCLASS_REFOF) {
402 node = obj_desc->reference.object;
403 } else { /* AML_INT_NAMEPATH_OP */
404
405 node = obj_desc->reference.node;
406 }
407
408 /* All "References" point to a NS node */
409
410 if (ACPI_GET_DESCRIPTOR_TYPE(node) !=
411 ACPI_DESC_TYPE_NAMED) {
412 ACPI_ERROR((AE_INFO,
413 "Not a namespace node %p [%s]",
414 node,
415 acpi_ut_get_descriptor_name(node)));
416 return_ACPI_STATUS(AE_AML_INTERNAL);
417 }
418
419 /* Get the attached object */
420
421 obj_desc = acpi_ns_get_attached_object(node);
422 if (!obj_desc) {
423
424 /* No object, use the NS node type */
425
426 type = acpi_ns_get_type(node);
427 goto exit;
428 }
429
430 /* Check for circular references */
431
432 if (obj_desc == operand) {
433 return_ACPI_STATUS(AE_AML_CIRCULAR_REFERENCE);
434 }
435 break;
436
437 case ACPI_REFCLASS_INDEX:
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) {
455
456 /* NULL package elements are allowed */
457
458 type = 0; /* Uninitialized */
459 goto exit;
460 }
461 break;
462
463 case ACPI_REFCLASS_TABLE:
464
465 type = ACPI_TYPE_DDB_HANDLE;
466 goto exit;
467
468 case ACPI_REFCLASS_LOCAL:
469 case ACPI_REFCLASS_ARG:
470
471 if (return_desc) {
472 status =
473 acpi_ds_method_data_get_value(obj_desc->
474 reference.
475 class,
476 obj_desc->
477 reference.
478 value,
479 walk_state,
480 &obj_desc);
481 if (ACPI_FAILURE(status)) {
482 return_ACPI_STATUS(status);
483 }
484 acpi_ut_remove_reference(obj_desc);
485 } else {
486 status =
487 acpi_ds_method_data_get_node(obj_desc->
488 reference.
489 class,
490 obj_desc->
491 reference.
492 value,
493 walk_state,
494 &node);
495 if (ACPI_FAILURE(status)) {
496 return_ACPI_STATUS(status);
497 }
498
499 obj_desc = acpi_ns_get_attached_object(node);
500 if (!obj_desc) {
501 type = ACPI_TYPE_ANY;
502 goto exit;
503 }
504 }
505 break;
506
507 case ACPI_REFCLASS_DEBUG:
508
509 /* The Debug Object is of type "DebugObject" */
510
511 type = ACPI_TYPE_DEBUG_OBJECT;
512 goto exit;
513
514 default:
515
516 ACPI_ERROR((AE_INFO,
517 "Unknown Reference Class 0x%2.2X",
518 obj_desc->reference.class));
519 return_ACPI_STATUS(AE_AML_INTERNAL);
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 */
527 type = obj_desc->common.type;
528
529exit:
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:
548
549 /* No change to Type required */
550
551 break;
552 }
553
554 *return_type = type;
555 if (return_desc) {
556 *return_desc = obj_desc;
557 }
558 return_ACPI_STATUS(AE_OK);
559}