summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpica/dswload.c
blob: 27069325b6de0efc0a68828fea12a9807a815c51 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: dswload - Dispatcher first pass namespace load callbacks
 *
 * Copyright (C) 2000 - 2020, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"
#ifdef ACPI_ASL_COMPILER
#include "acdisasm.h"
#endif

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dswload")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_init_callbacks
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *              pass_number     - 1, 2, or 3
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Init walk state callbacks
 *
 ******************************************************************************/
acpi_status
acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number)
{

	switch (pass_number) {
	case 0:

		/* Parse only - caller will setup callbacks */

		walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
		    ACPI_PARSE_DELETE_TREE | ACPI_PARSE_DISASSEMBLE;
		walk_state->descending_callback = NULL;
		walk_state->ascending_callback = NULL;
		break;

	case 1:

		/* Load pass 1 */

		walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
		    ACPI_PARSE_DELETE_TREE;
		walk_state->descending_callback = acpi_ds_load1_begin_op;
		walk_state->ascending_callback = acpi_ds_load1_end_op;
		break;

	case 2:

		/* Load pass 2 */

		walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
		    ACPI_PARSE_DELETE_TREE;
		walk_state->descending_callback = acpi_ds_load2_begin_op;
		walk_state->ascending_callback = acpi_ds_load2_end_op;
		break;

	case 3:

		/* Execution pass */

		walk_state->parse_flags |= ACPI_PARSE_EXECUTE |
		    ACPI_PARSE_DELETE_TREE;
		walk_state->descending_callback = acpi_ds_exec_begin_op;
		walk_state->ascending_callback = acpi_ds_exec_end_op;
		break;

	default:

		return (AE_BAD_PARAMETER);
	}

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_load1_begin_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *              out_op          - Where to return op if a new one is created
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 *
 ******************************************************************************/

acpi_status
acpi_ds_load1_begin_op(struct acpi_walk_state *walk_state,
		       union acpi_parse_object **out_op)
{
	union acpi_parse_object *op;
	struct acpi_namespace_node *node;
	acpi_status status;
	acpi_object_type object_type;
	char *path;
	u32 flags;

	ACPI_FUNCTION_TRACE_PTR(ds_load1_begin_op, walk_state->op);

	op = walk_state->op;
	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
			  walk_state));

	/* We are only interested in opcodes that have an associated name */

	if (op) {
		if (!(walk_state->op_info->flags & AML_NAMED)) {
			*out_op = op;
			return_ACPI_STATUS(AE_OK);
		}

		/* Check if this object has already been installed in the namespace */

		if (op->common.node) {
			*out_op = op;
			return_ACPI_STATUS(AE_OK);
		}
	}

	path = acpi_ps_get_next_namestring(&walk_state->parser_state);

	/* Map the raw opcode into an internal object type */

	object_type = walk_state->op_info->object_type;

	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
			  "State=%p Op=%p [%s]\n", walk_state, op,
			  acpi_ut_get_type_name(object_type)));

	switch (walk_state->opcode) {
	case AML_SCOPE_OP:
		/*
		 * The target name of the Scope() operator must exist at this point so
		 * that we can actually open the scope to enter new names underneath it.
		 * Allow search-to-root for single namesegs.
		 */
		status =
		    acpi_ns_lookup(walk_state->scope_info, path, object_type,
				   ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
				   walk_state, &(node));
#ifdef ACPI_ASL_COMPILER
		if (status == AE_NOT_FOUND) {
			/*
			 * Table disassembly:
			 * Target of Scope() not found. Generate an External for it, and
			 * insert the name into the namespace.
			 */
			acpi_dm_add_op_to_external_list(op, path,
							ACPI_TYPE_DEVICE, 0, 0);
			status =
			    acpi_ns_lookup(walk_state->scope_info, path,
					   object_type, ACPI_IMODE_LOAD_PASS1,
					   ACPI_NS_SEARCH_PARENT, walk_state,
					   &node);
		}
#endif
		if (ACPI_FAILURE(status)) {
			ACPI_ERROR_NAMESPACE(walk_state->scope_info, path,
					     status);
			return_ACPI_STATUS(status);
		}

		/*
		 * Check to make sure that the target is
		 * one of the opcodes that actually opens a scope
		 */
		switch (node->type) {
		case ACPI_TYPE_ANY:
		case ACPI_TYPE_LOCAL_SCOPE:	/* Scope  */
		case ACPI_TYPE_DEVICE:
		case ACPI_TYPE_POWER:
		case ACPI_TYPE_PROCESSOR:
		case ACPI_TYPE_THERMAL:

			/* These are acceptable types */
			break;

		case ACPI_TYPE_INTEGER:
		case ACPI_TYPE_STRING:
		case ACPI_TYPE_BUFFER:
			/*
			 * These types we will allow, but we will change the type.
			 * This enables some existing code of the form:
			 *
			 *  Name (DEB, 0)
			 *  Scope (DEB) { ... }
			 *
			 * Note: silently change the type here. On the second pass,
			 * we will report a warning
			 */
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "Type override - [%4.4s] had invalid type (%s) "
					  "for Scope operator, changed to type ANY\n",
					  acpi_ut_get_node_name(node),
					  acpi_ut_get_type_name(node->type)));

			node->type = ACPI_TYPE_ANY;
			walk_state->scope_info->common.value = ACPI_TYPE_ANY;
			break;

		case ACPI_TYPE_METHOD:
			/*
			 * Allow scope change to root during execution of module-level
			 * code. Root is typed METHOD during this time.
			 */
			if ((node == acpi_gbl_root_node) &&
			    (walk_state->
			     parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
				break;
			}

			/*lint -fallthrough */

		default:

			/* All other types are an error */

			ACPI_ERROR((AE_INFO,
				    "Invalid type (%s) for target of "
				    "Scope operator [%4.4s] (Cannot override)",
				    acpi_ut_get_type_name(node->type),
				    acpi_ut_get_node_name(node)));

			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}
		break;

	default:
		/*
		 * For all other named opcodes, we will enter the name into
		 * the namespace.
		 *
		 * Setup the search flags.
		 * Since we are entering a name into the namespace, we do not want to
		 * enable the search-to-root upsearch.
		 *
		 * There are only two conditions where it is acceptable that the name
		 * already exists:
		 *    1) the Scope() operator can reopen a scoping object that was
		 *       previously defined (Scope, Method, Device, etc.)
		 *    2) Whenever we are parsing a deferred opcode (op_region, Buffer,
		 *       buffer_field, or Package), the name of the object is already
		 *       in the namespace.
		 */
		if (walk_state->deferred_node) {

			/* This name is already in the namespace, get the node */

			node = walk_state->deferred_node;
			status = AE_OK;
			break;
		}

		/*
		 * If we are executing a method, do not create any namespace objects
		 * during the load phase, only during execution.
		 */
		if (walk_state->method_node) {
			node = NULL;
			status = AE_OK;
			break;
		}

		flags = ACPI_NS_NO_UPSEARCH;
		if ((walk_state->opcode != AML_SCOPE_OP) &&
		    (!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) {
			if (walk_state->namespace_override) {
				flags |= ACPI_NS_OVERRIDE_IF_FOUND;
				ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
						  "[%s] Override allowed\n",
						  acpi_ut_get_type_name
						  (object_type)));
			} else {
				flags |= ACPI_NS_ERROR_IF_FOUND;
				ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
						  "[%s] Cannot already exist\n",
						  acpi_ut_get_type_name
						  (object_type)));
			}
		} else {
			ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
					  "[%s] Both Find or Create allowed\n",
					  acpi_ut_get_type_name(object_type)));
		}

		/*
		 * Enter the named type into the internal namespace. We enter the name
		 * as we go downward in the parse tree. Any necessary subobjects that
		 * involve arguments to the opcode must be created as we go back up the
		 * parse tree later.
		 */
		status =
		    acpi_ns_lookup(walk_state->scope_info, path, object_type,
				   ACPI_IMODE_LOAD_PASS1, flags, walk_state,
				   &node);
		if (ACPI_FAILURE(status)) {
			if (status == AE_ALREADY_EXISTS) {

				/* The name already exists in this scope */

				if (node->flags & ANOBJ_IS_EXTERNAL) {
					/*
					 * Allow one create on an object or segment that was
					 * previously declared External
					 */
					node->flags &= ~ANOBJ_IS_EXTERNAL;
					node->type = (u8) object_type;

					/* Just retyped a node, probably will need to open a scope */

					if (acpi_ns_opens_scope(object_type)) {
						status =
						    acpi_ds_scope_stack_push
						    (node, object_type,
						     walk_state);
						if (ACPI_FAILURE(status)) {
							return_ACPI_STATUS
							    (status);
						}
					}

					status = AE_OK;
				}
			}

			if (ACPI_FAILURE(status)) {
				ACPI_ERROR_NAMESPACE(walk_state->scope_info,
						     path, status);
				return_ACPI_STATUS(status);
			}
		}
		break;
	}

	/* Common exit */

	if (!op) {

		/* Create a new op */

		op = acpi_ps_alloc_op(walk_state->opcode, walk_state->aml);
		if (!op) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}
	}

	/* Initialize the op */

#ifdef ACPI_CONSTANT_EVAL_ONLY
	op->named.path = path;
#endif

	if (node) {
		/*
		 * Put the Node in the "op" object that the parser uses, so we
		 * can get it again quickly when this scope is closed
		 */
		op->common.node = node;
		op->named.name = node->name.integer;
	}

	acpi_ps_append_arg(acpi_ps_get_parent_scope(&walk_state->parser_state),
			   op);
	*out_op = op;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_load1_end_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Ascending callback used during the loading of the namespace,
 *              both control methods and everything else.
 *
 ******************************************************************************/

acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
{
	union acpi_parse_object *op;
	acpi_object_type object_type;
	acpi_status status = AE_OK;
#ifdef ACPI_ASL_COMPILER
	u8 param_count;
#endif

	ACPI_FUNCTION_TRACE(ds_load1_end_op);

	op = walk_state->op;
	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
			  walk_state));

	/*
	 * Disassembler: handle create field operators here.
	 *
	 * create_buffer_field is a deferred op that is typically processed in load
	 * pass 2. However, disassembly of control method contents walk the parse
	 * tree with ACPI_PARSE_LOAD_PASS1 and AML_CREATE operators are processed
	 * in a later walk. This is a problem when there is a control method that
	 * has the same name as the AML_CREATE object. In this case, any use of the
	 * name segment will be detected as a method call rather than a reference
	 * to a buffer field.
	 *
	 * This earlier creation during disassembly solves this issue by inserting
	 * the named object in the ACPI namespace so that references to this name
	 * would be a name string rather than a method call.
	 */
	if ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) &&
	    (walk_state->op_info->flags & AML_CREATE)) {
		status = acpi_ds_create_buffer_field(op, walk_state);
		return_ACPI_STATUS(status);
	}

	/* We are only interested in opcodes that have an associated name */

	if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {
		return_ACPI_STATUS(AE_OK);
	}

	/* Get the object type to determine if we should pop the scope */

	object_type = walk_state->op_info->object_type;

	if (walk_state->op_info->flags & AML_FIELD) {
		/*
		 * If we are executing a method, do not create any namespace objects
		 * during the load phase, only during execution.
		 */
		if (!walk_state->method_node) {
			if (walk_state->opcode == AML_FIELD_OP ||
			    walk_state->opcode == AML_BANK_FIELD_OP ||
			    walk_state->opcode == AML_INDEX_FIELD_OP) {
				status =
				    acpi_ds_init_field_objects(op, walk_state);
			}
		}
		return_ACPI_STATUS(status);
	}

	/*
	 * If we are executing a method, do not create any namespace objects
	 * during the load phase, only during execution.
	 */
	if (!walk_state->method_node) {
		if (op->common.aml_opcode == AML_REGION_OP) {
			status =
			    acpi_ex_create_region(op->named.data,
						  op->named.length,
						  (acpi_adr_space_type)
						  ((op->common.value.arg)->
						   common.value.integer),
						  walk_state);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		} else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
			status =
			    acpi_ex_create_region(op->named.data,
						  op->named.length,
						  ACPI_ADR_SPACE_DATA_TABLE,
						  walk_state);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		}
	}

	if (op->common.aml_opcode == AML_NAME_OP) {

		/* For Name opcode, get the object type from the argument */

		if (op->common.value.arg) {
			object_type = (acpi_ps_get_opcode_info((op->common.
								value.arg)->
							       common.
							       aml_opcode))->
			    object_type;

			/* Set node type if we have a namespace node */

			if (op->common.node) {
				op->common.node->type = (u8) object_type;
			}
		}
	}
#ifdef ACPI_ASL_COMPILER
	/*
	 * For external opcode, get the object type from the argument and
	 * get the parameter count from the argument's next.
	 */
	if (acpi_gbl_disasm_flag &&
	    op->common.node && op->common.aml_opcode == AML_EXTERNAL_OP) {
		/*
		 * Note, if this external is not a method
		 * Op->Common.Value.Arg->Common.Next->Common.Value.Integer == 0
		 * Therefore, param_count will be 0.
		 */
		param_count =
		    (u8)op->common.value.arg->common.next->common.value.integer;
		object_type = (u8)op->common.value.arg->common.value.integer;
		op->common.node->flags |= ANOBJ_IS_EXTERNAL;
		op->common.node->type = (u8)object_type;

		acpi_dm_create_subobject_for_external((u8)object_type,
						      &op->common.node,
						      param_count);

		/*
		 * Add the external to the external list because we may be
		 * emitting code based off of the items within the external list.
		 */
		acpi_dm_add_op_to_external_list(op, op->named.path,
						(u8)object_type, param_count,
						ACPI_EXT_ORIGIN_FROM_OPCODE |
						ACPI_EXT_RESOLVED_REFERENCE);
	}
#endif

	/*
	 * If we are executing a method, do not create any namespace objects
	 * during the load phase, only during execution.
	 */
	if (!walk_state->method_node) {
		if (op->common.aml_opcode == AML_METHOD_OP) {
			/*
			 * method_op pkg_length name_string method_flags term_list
			 *
			 * Note: We must create the method node/object pair as soon as we
			 * see the method declaration. This allows later pass1 parsing
			 * of invocations of the method (need to know the number of
			 * arguments.)
			 */
			ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
					  "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
					  walk_state, op, op->named.node));

			if (!acpi_ns_get_attached_object(op->named.node)) {
				walk_state->operands[0] =
				    ACPI_CAST_PTR(void, op->named.node);
				walk_state->num_operands = 1;

				status =
				    acpi_ds_create_operands(walk_state,
							    op->common.value.
							    arg);
				if (ACPI_SUCCESS(status)) {
					status =
					    acpi_ex_create_method(op->named.
								  data,
								  op->named.
								  length,
								  walk_state);
				}

				walk_state->operands[0] = NULL;
				walk_state->num_operands = 0;

				if (ACPI_FAILURE(status)) {
					return_ACPI_STATUS(status);
				}
			}
		}
	}

	/* Pop the scope stack (only if loading a table) */

	if (!walk_state->method_node &&
	    op->common.aml_opcode != AML_EXTERNAL_OP &&
	    acpi_ns_opens_scope(object_type)) {
		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
				  "(%s): Popping scope for Op %p\n",
				  acpi_ut_get_type_name(object_type), op));

		status = acpi_ds_scope_stack_pop(walk_state);
	}

	return_ACPI_STATUS(status);
}