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hugetlb: make unmap_ref_private multi-size-aware
[zen-stable.git] / drivers / acpi / executer / exresolv.c
blob89571b92a52279258812e7cc6f93ad5024acc28b
1
2 /******************************************************************************
3 *
4 * Module Name: exresolv - AML Interpreter object resolution
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2008, 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 <acpi/amlcode.h>
47 #include <acpi/acdispat.h>
48 #include <acpi/acinterp.h>
49 #include <acpi/acnamesp.h>
50
51 #define _COMPONENT ACPI_EXECUTER
52 ACPI_MODULE_NAME("exresolv")
53
54 /* Local prototypes */
55 static acpi_status
56 acpi_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
74 acpi_status
75 acpi_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
136 static acpi_status
137 acpi_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 union acpi_operand_object */
150
151 switch (ACPI_GET_OBJECT_TYPE(stack_desc)) {
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 /*
161 * Get the local from the method's state info
162 * Note: this increments the local's object reference count
163 */
164 status = acpi_ds_method_data_get_value(ref_type,
165 stack_desc->
166 reference.value,
167 walk_state,
168 &obj_desc);
169 if (ACPI_FAILURE(status)) {
170 return_ACPI_STATUS(status);
171 }
172
173 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
174 "[Arg/Local %X] ValueObj is %p\n",
175 stack_desc->reference.value,
176 obj_desc));
177
178 /*
179 * Now we can delete the original Reference Object and
180 * replace it with the resolved value
181 */
182 acpi_ut_remove_reference(stack_desc);
183 *stack_ptr = obj_desc;
184 break;
185
186 case ACPI_REFCLASS_INDEX:
187
188 switch (stack_desc->reference.target_type) {
189 case ACPI_TYPE_BUFFER_FIELD:
190
191 /* Just return - do not dereference */
192 break;
193
194 case ACPI_TYPE_PACKAGE:
195
196 /* If method call or copy_object - do not dereference */
197
198 if ((walk_state->opcode ==
199 AML_INT_METHODCALL_OP)
200 || (walk_state->opcode == AML_COPY_OP)) {
201 break;
202 }
203
204 /* Otherwise, dereference the package_index to a package element */
205
206 obj_desc = *stack_desc->reference.where;
207 if (obj_desc) {
208 /*
209 * Valid object descriptor, copy pointer to return value
210 * (i.e., dereference the package index)
211 * Delete the ref object, increment the returned object
212 */
213 acpi_ut_remove_reference(stack_desc);
214 acpi_ut_add_reference(obj_desc);
215 *stack_ptr = obj_desc;
216 } else {
217 /*
218 * A NULL object descriptor means an uninitialized element of
219 * the package, can't dereference it
220 */
221 ACPI_ERROR((AE_INFO,
222 "Attempt to dereference an Index to NULL package element Idx=%p",
223 stack_desc));
224 status = AE_AML_UNINITIALIZED_ELEMENT;
225 }
226 break;
227
228 default:
229
230 /* Invalid reference object */
231
232 ACPI_ERROR((AE_INFO,
233 "Unknown TargetType %X in Index/Reference object %p",
234 stack_desc->reference.target_type,
235 stack_desc));
236 status = AE_AML_INTERNAL;
237 break;
238 }
239 break;
240
241 case ACPI_REFCLASS_REFOF:
242 case ACPI_REFCLASS_DEBUG:
243 case ACPI_REFCLASS_TABLE:
244
245 /* Just leave the object as-is, do not dereference */
246
247 break;
248
249 case ACPI_REFCLASS_NAME: /* Reference to a named object */
250
251 /* Dereference the name */
252
253 if ((stack_desc->reference.node->type ==
254 ACPI_TYPE_DEVICE)
255 || (stack_desc->reference.node->type ==
256 ACPI_TYPE_THERMAL)) {
257
258 /* These node types do not have 'real' subobjects */
259
260 *stack_ptr = (void *)stack_desc->reference.node;
261 } else {
262 /* Get the object pointed to by the namespace node */
263
264 *stack_ptr =
265 (stack_desc->reference.node)->object;
266 acpi_ut_add_reference(*stack_ptr);
267 }
268
269 acpi_ut_remove_reference(stack_desc);
270 break;
271
272 default:
273
274 ACPI_ERROR((AE_INFO,
275 "Unknown Reference type %X in %p", ref_type,
276 stack_desc));
277 status = AE_AML_INTERNAL;
278 break;
279 }
280 break;
281
282 case ACPI_TYPE_BUFFER:
283
284 status = acpi_ds_get_buffer_arguments(stack_desc);
285 break;
286
287 case ACPI_TYPE_PACKAGE:
288
289 status = acpi_ds_get_package_arguments(stack_desc);
290 break;
291
292 case ACPI_TYPE_BUFFER_FIELD:
293 case ACPI_TYPE_LOCAL_REGION_FIELD:
294 case ACPI_TYPE_LOCAL_BANK_FIELD:
295 case ACPI_TYPE_LOCAL_INDEX_FIELD:
296
297 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
298 "FieldRead SourceDesc=%p Type=%X\n",
299 stack_desc,
300 ACPI_GET_OBJECT_TYPE(stack_desc)));
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
335 acpi_status
336 acpi_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 (ACPI_GET_OBJECT_TYPE(obj_desc) == 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, "Not a NS node %p [%s]",
407 node,
408 acpi_ut_get_descriptor_name(node)));
409 return_ACPI_STATUS(AE_AML_INTERNAL);
410 }
411
412 /* Get the attached object */
413
414 obj_desc = acpi_ns_get_attached_object(node);
415 if (!obj_desc) {
416
417 /* No object, use the NS node type */
418
419 type = acpi_ns_get_type(node);
420 goto exit;
421 }
422
423 /* Check for circular references */
424
425 if (obj_desc == operand) {
426 return_ACPI_STATUS(AE_AML_CIRCULAR_REFERENCE);
427 }
428 break;
429
430 case ACPI_REFCLASS_INDEX:
431
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) {
448
449 /* NULL package elements are allowed */
450
451 type = 0; /* Uninitialized */
452 goto exit;
453 }
454 break;
455
456 case ACPI_REFCLASS_TABLE:
457
458 type = ACPI_TYPE_DDB_HANDLE;
459 goto exit;
460
461 case ACPI_REFCLASS_LOCAL:
462 case ACPI_REFCLASS_ARG:
463
464 if (return_desc) {
465 status =
466 acpi_ds_method_data_get_value(obj_desc->
467 reference.
468 class,
469 obj_desc->
470 reference.
471 value,
472 walk_state,
473 &obj_desc);
474 if (ACPI_FAILURE(status)) {
475 return_ACPI_STATUS(status);
476 }
477 acpi_ut_remove_reference(obj_desc);
478 } else {
479 status =
480 acpi_ds_method_data_get_node(obj_desc->
481 reference.
482 class,
483 obj_desc->
484 reference.
485 value,
486 walk_state,
487 &node);
488 if (ACPI_FAILURE(status)) {
489 return_ACPI_STATUS(status);
490 }
491
492 obj_desc = acpi_ns_get_attached_object(node);
493 if (!obj_desc) {
494 type = ACPI_TYPE_ANY;
495 goto exit;
496 }
497 }
498 break;
499
500 case ACPI_REFCLASS_DEBUG:
501
502 /* The Debug Object is of type "DebugObject" */
503
504 type = ACPI_TYPE_DEBUG_OBJECT;
505 goto exit;
506
507 default:
508
509 ACPI_ERROR((AE_INFO,
510 "Unknown Reference Class %2.2X",
511 obj_desc->reference.class));
512 return_ACPI_STATUS(AE_AML_INTERNAL);
513 }
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 */
520 type = ACPI_GET_OBJECT_TYPE(obj_desc);
521
522 exit:
523 /* 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 }
549 return_ACPI_STATUS(AE_OK);
550 }