summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/dispatcher/dsfield.c
blob: f3a008ff1eae977c2b9006c41f263d6c5943a081 (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
/******************************************************************************
 *
 * Module Name: dsfield - Dispatcher field routines
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2006, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include <acpi/amlcode.h>
#include <acpi/acdispat.h>
#include <acpi/acinterp.h>
#include <acpi/acnamesp.h>
#include <acpi/acparser.h>

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dsfield")

/* Local prototypes */
static acpi_status
acpi_ds_get_field_names(struct acpi_create_field_info *info,
			struct acpi_walk_state *walk_state,
			union acpi_parse_object *arg);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_create_buffer_field
 *
 * PARAMETERS:  Op                  - Current parse op (create_xXField)
 *              walk_state          - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute the create_field operators:
 *              create_bit_field_op,
 *              create_byte_field_op,
 *              create_word_field_op,
 *              create_dword_field_op,
 *              create_qword_field_op,
 *              create_field_op     (all of which define a field in a buffer)
 *
 ******************************************************************************/

acpi_status
acpi_ds_create_buffer_field(union acpi_parse_object *op,
			    struct acpi_walk_state *walk_state)
{
	union acpi_parse_object *arg;
	struct acpi_namespace_node *node;
	acpi_status status;
	union acpi_operand_object *obj_desc;
	union acpi_operand_object *second_desc = NULL;
	u32 flags;

	ACPI_FUNCTION_TRACE("ds_create_buffer_field");

	/* Get the name_string argument */

	if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
		arg = acpi_ps_get_arg(op, 3);
	} else {
		/* Create Bit/Byte/Word/Dword field */

		arg = acpi_ps_get_arg(op, 2);
	}

	if (!arg) {
		return_ACPI_STATUS(AE_AML_NO_OPERAND);
	}

	if (walk_state->deferred_node) {
		node = walk_state->deferred_node;
		status = AE_OK;
	} else {
		/*
		 * During the load phase, we want to enter the name of the field into
		 * the namespace.  During the execute phase (when we evaluate the size
		 * operand), we want to lookup the name
		 */
		if (walk_state->parse_flags & ACPI_PARSE_EXECUTE) {
			flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE;
		} else {
			flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
			    ACPI_NS_ERROR_IF_FOUND;
		}

		/*
		 * Enter the name_string into the namespace
		 */
		status =
		    acpi_ns_lookup(walk_state->scope_info,
				   arg->common.value.string, ACPI_TYPE_ANY,
				   ACPI_IMODE_LOAD_PASS1, flags, walk_state,
				   &(node));
		if (ACPI_FAILURE(status)) {
			ACPI_REPORT_NSERROR(arg->common.value.string, status);
			return_ACPI_STATUS(status);
		}
	}

	/* We could put the returned object (Node) on the object stack for later,
	 * but for now, we will put it in the "op" object that the parser uses,
	 * so we can get it again at the end of this scope
	 */
	op->common.node = node;

	/*
	 * If there is no object attached to the node, this node was just created
	 * and we need to create the field object.  Otherwise, this was a lookup
	 * of an existing node and we don't want to create the field object again.
	 */
	obj_desc = acpi_ns_get_attached_object(node);
	if (obj_desc) {
		return_ACPI_STATUS(AE_OK);
	}

	/*
	 * The Field definition is not fully parsed at this time.
	 * (We must save the address of the AML for the buffer and index operands)
	 */

	/* Create the buffer field object */

	obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER_FIELD);
	if (!obj_desc) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/*
	 * Remember location in AML stream of the field unit
	 * opcode and operands -- since the buffer and index
	 * operands must be evaluated.
	 */
	second_desc = obj_desc->common.next_object;
	second_desc->extra.aml_start = op->named.data;
	second_desc->extra.aml_length = op->named.length;
	obj_desc->buffer_field.node = node;

	/* Attach constructed field descriptors to parent node */

	status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_BUFFER_FIELD);
	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

      cleanup:

	/* Remove local reference to the object */

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_get_field_names
 *
 * PARAMETERS:  Info            - create_field info structure
 *  `           walk_state      - Current method state
 *              Arg             - First parser arg for the field name list
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Process all named fields in a field declaration.  Names are
 *              entered into the namespace.
 *
 ******************************************************************************/

static acpi_status
acpi_ds_get_field_names(struct acpi_create_field_info *info,
			struct acpi_walk_state *walk_state,
			union acpi_parse_object *arg)
{
	acpi_status status;
	acpi_integer position;

	ACPI_FUNCTION_TRACE_PTR("ds_get_field_names", info);

	/* First field starts at bit zero */

	info->field_bit_position = 0;

	/* Process all elements in the field list (of parse nodes) */

	while (arg) {
		/*
		 * Three types of field elements are handled:
		 * 1) Offset - specifies a bit offset
		 * 2) access_as - changes the access mode
		 * 3) Name - Enters a new named field into the namespace
		 */
		switch (arg->common.aml_opcode) {
		case AML_INT_RESERVEDFIELD_OP:

			position = (acpi_integer) info->field_bit_position
			    + (acpi_integer) arg->common.value.size;

			if (position > ACPI_UINT32_MAX) {
				ACPI_REPORT_ERROR(("Bit offset within field too large (> 0xFFFFFFFF)\n"));
				return_ACPI_STATUS(AE_SUPPORT);
			}

			info->field_bit_position = (u32) position;
			break;

		case AML_INT_ACCESSFIELD_OP:

			/*
			 * Get a new access_type and access_attribute -- to be used for all
			 * field units that follow, until field end or another access_as
			 * keyword.
			 *
			 * In field_flags, preserve the flag bits other than the
			 * ACCESS_TYPE bits
			 */
			info->field_flags = (u8)
			    ((info->
			      field_flags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
			     ((u8) ((u32) arg->common.value.integer >> 8)));

			info->attribute = (u8) (arg->common.value.integer);
			break;

		case AML_INT_NAMEDFIELD_OP:

			/* Lookup the name */

			status = acpi_ns_lookup(walk_state->scope_info,
						(char *)&arg->named.name,
						info->field_type,
						ACPI_IMODE_EXECUTE,
						ACPI_NS_DONT_OPEN_SCOPE,
						walk_state, &info->field_node);
			if (ACPI_FAILURE(status)) {
				ACPI_REPORT_NSERROR((char *)&arg->named.name,
						    status);
				if (status != AE_ALREADY_EXISTS) {
					return_ACPI_STATUS(status);
				}

				/* Already exists, ignore error */
			} else {
				arg->common.node = info->field_node;
				info->field_bit_length = arg->common.value.size;

				/* Create and initialize an object for the new Field Node */

				status = acpi_ex_prep_field_value(info);
				if (ACPI_FAILURE(status)) {
					return_ACPI_STATUS(status);
				}
			}

			/* Keep track of bit position for the next field */

			position = (acpi_integer) info->field_bit_position
			    + (acpi_integer) arg->common.value.size;

			if (position > ACPI_UINT32_MAX) {
				ACPI_REPORT_ERROR(("Field [%4.4s] bit offset too large (> 0xFFFFFFFF)\n", ACPI_CAST_PTR(char, &info->field_node->name)));
				return_ACPI_STATUS(AE_SUPPORT);
			}

			info->field_bit_position += info->field_bit_length;
			break;

		default:

			ACPI_REPORT_ERROR(("Invalid opcode in field list: %X\n",
					   arg->common.aml_opcode));
			return_ACPI_STATUS(AE_AML_BAD_OPCODE);
		}

		arg = arg->common.next;
	}

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_create_field
 *
 * PARAMETERS:  Op              - Op containing the Field definition and args
 *              region_node     - Object for the containing Operation Region
 *  `           walk_state      - Current method state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new field in the specified operation region
 *
 ******************************************************************************/

acpi_status
acpi_ds_create_field(union acpi_parse_object *op,
		     struct acpi_namespace_node *region_node,
		     struct acpi_walk_state *walk_state)
{
	acpi_status status;
	union acpi_parse_object *arg;
	struct acpi_create_field_info info;

	ACPI_FUNCTION_TRACE_PTR("ds_create_field", op);

	/* First arg is the name of the parent op_region (must already exist) */

	arg = op->common.value.arg;
	if (!region_node) {
		status =
		    acpi_ns_lookup(walk_state->scope_info,
				   arg->common.value.name, ACPI_TYPE_REGION,
				   ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
				   walk_state, &region_node);
		if (ACPI_FAILURE(status)) {
			ACPI_REPORT_NSERROR(arg->common.value.name, status);
			return_ACPI_STATUS(status);
		}
	}

	/* Second arg is the field flags */

	arg = arg->common.next;
	info.field_flags = (u8) arg->common.value.integer;
	info.attribute = 0;

	/* Each remaining arg is a Named Field */

	info.field_type = ACPI_TYPE_LOCAL_REGION_FIELD;
	info.region_node = region_node;

	status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_init_field_objects
 *
 * PARAMETERS:  Op              - Op containing the Field definition and args
 *  `           walk_state      - Current method state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: For each "Field Unit" name in the argument list that is
 *              part of the field declaration, enter the name into the
 *              namespace.
 *
 ******************************************************************************/

acpi_status
acpi_ds_init_field_objects(union acpi_parse_object *op,
			   struct acpi_walk_state *walk_state)
{
	acpi_status status;
	union acpi_parse_object *arg = NULL;
	struct acpi_namespace_node *node;
	u8 type = 0;

	ACPI_FUNCTION_TRACE_PTR("ds_init_field_objects", op);

	switch (walk_state->opcode) {
	case AML_FIELD_OP:
		arg = acpi_ps_get_arg(op, 2);
		type = ACPI_TYPE_LOCAL_REGION_FIELD;
		break;

	case AML_BANK_FIELD_OP:
		arg = acpi_ps_get_arg(op, 4);
		type = ACPI_TYPE_LOCAL_BANK_FIELD;
		break;

	case AML_INDEX_FIELD_OP:
		arg = acpi_ps_get_arg(op, 3);
		type = ACPI_TYPE_LOCAL_INDEX_FIELD;
		break;

	default:
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/*
	 * Walk the list of entries in the field_list
	 */
	while (arg) {
		/* Ignore OFFSET and ACCESSAS terms here */

		if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
			status = acpi_ns_lookup(walk_state->scope_info,
						(char *)&arg->named.name,
						type, ACPI_IMODE_LOAD_PASS1,
						ACPI_NS_NO_UPSEARCH |
						ACPI_NS_DONT_OPEN_SCOPE |
						ACPI_NS_ERROR_IF_FOUND,
						walk_state, &node);
			if (ACPI_FAILURE(status)) {
				ACPI_REPORT_NSERROR((char *)&arg->named.name,
						    status);
				if (status != AE_ALREADY_EXISTS) {
					return_ACPI_STATUS(status);
				}

				/* Name already exists, just ignore this error */

				status = AE_OK;
			}

			arg->common.node = node;
		}

		/* Move to next field in the list */

		arg = arg->common.next;
	}

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_create_bank_field
 *
 * PARAMETERS:  Op              - Op containing the Field definition and args
 *              region_node     - Object for the containing Operation Region
 *  `           walk_state      - Current method state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new bank field in the specified operation region
 *
 ******************************************************************************/

acpi_status
acpi_ds_create_bank_field(union acpi_parse_object *op,
			  struct acpi_namespace_node *region_node,
			  struct acpi_walk_state *walk_state)
{
	acpi_status status;
	union acpi_parse_object *arg;
	struct acpi_create_field_info info;

	ACPI_FUNCTION_TRACE_PTR("ds_create_bank_field", op);

	/* First arg is the name of the parent op_region (must already exist) */

	arg = op->common.value.arg;
	if (!region_node) {
		status =
		    acpi_ns_lookup(walk_state->scope_info,
				   arg->common.value.name, ACPI_TYPE_REGION,
				   ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
				   walk_state, &region_node);
		if (ACPI_FAILURE(status)) {
			ACPI_REPORT_NSERROR(arg->common.value.name, status);
			return_ACPI_STATUS(status);
		}
	}

	/* Second arg is the Bank Register (Field) (must already exist) */

	arg = arg->common.next;
	status =
	    acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
			   ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
			   ACPI_NS_SEARCH_PARENT, walk_state,
			   &info.register_node);
	if (ACPI_FAILURE(status)) {
		ACPI_REPORT_NSERROR(arg->common.value.string, status);
		return_ACPI_STATUS(status);
	}

	/* Third arg is the bank_value */

	arg = arg->common.next;
	info.bank_value = (u32) arg->common.value.integer;

	/* Fourth arg is the field flags */

	arg = arg->common.next;
	info.field_flags = (u8) arg->common.value.integer;

	/* Each remaining arg is a Named Field */

	info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
	info.region_node = region_node;

	status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_create_index_field
 *
 * PARAMETERS:  Op              - Op containing the Field definition and args
 *              region_node     - Object for the containing Operation Region
 *  `           walk_state      - Current method state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new index field in the specified operation region
 *
 ******************************************************************************/

acpi_status
acpi_ds_create_index_field(union acpi_parse_object *op,
			   struct acpi_namespace_node *region_node,
			   struct acpi_walk_state *walk_state)
{
	acpi_status status;
	union acpi_parse_object *arg;
	struct acpi_create_field_info info;

	ACPI_FUNCTION_TRACE_PTR("ds_create_index_field", op);

	/* First arg is the name of the Index register (must already exist) */

	arg = op->common.value.arg;
	status =
	    acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
			   ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
			   ACPI_NS_SEARCH_PARENT, walk_state,
			   &info.register_node);
	if (ACPI_FAILURE(status)) {
		ACPI_REPORT_NSERROR(arg->common.value.string, status);
		return_ACPI_STATUS(status);
	}

	/* Second arg is the data register (must already exist) */

	arg = arg->common.next;
	status =
	    acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
			   ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
			   ACPI_NS_SEARCH_PARENT, walk_state,
			   &info.data_register_node);
	if (ACPI_FAILURE(status)) {
		ACPI_REPORT_NSERROR(arg->common.value.string, status);
		return_ACPI_STATUS(status);
	}

	/* Next arg is the field flags */

	arg = arg->common.next;
	info.field_flags = (u8) arg->common.value.integer;

	/* Each remaining arg is a Named Field */

	info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
	info.region_node = region_node;

	status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);

	return_ACPI_STATUS(status);
}