summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpica/dsobject.c
blob: 3c0c31157e7e029581310b276adff1d909eca8ff (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
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: dsobject - Dispatcher object management routines
 *
 * Copyright (C) 2000 - 2021, Intel Corp.
 *
 *****************************************************************************/

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

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dsobject")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_build_internal_object
 *
 * PARAMETERS:  walk_state      - Current walk state
 *              op              - Parser object to be translated
 *              obj_desc_ptr    - Where the ACPI internal object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Translate a parser Op object to the equivalent namespace object
 *              Simple objects are any objects other than a package object!
 *
 ******************************************************************************/
acpi_status
acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
			      union acpi_parse_object *op,
			      union acpi_operand_object **obj_desc_ptr)
{
	union acpi_operand_object *obj_desc;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ds_build_internal_object);

	*obj_desc_ptr = NULL;
	if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
		/*
		 * This is a named object reference. If this name was
		 * previously looked up in the namespace, it was stored in
		 * this op. Otherwise, go ahead and look it up now
		 */
		if (!op->common.node) {

			/* Check if we are resolving a named reference within a package */

			if ((op->common.parent->common.aml_opcode ==
			     AML_PACKAGE_OP)
			    || (op->common.parent->common.aml_opcode ==
				AML_VARIABLE_PACKAGE_OP)) {
				/*
				 * We won't resolve package elements here, we will do this
				 * after all ACPI tables are loaded into the namespace. This
				 * behavior supports both forward references to named objects
				 * and external references to objects in other tables.
				 */
				goto create_new_object;
			} else {
				status = acpi_ns_lookup(walk_state->scope_info,
							op->common.value.string,
							ACPI_TYPE_ANY,
							ACPI_IMODE_EXECUTE,
							ACPI_NS_SEARCH_PARENT |
							ACPI_NS_DONT_OPEN_SCOPE,
							NULL,
							ACPI_CAST_INDIRECT_PTR
							(struct
							 acpi_namespace_node,
							 &(op->common.node)));
				if (ACPI_FAILURE(status)) {
					ACPI_ERROR_NAMESPACE(walk_state->
							     scope_info,
							     op->common.value.
							     string, status);
					return_ACPI_STATUS(status);
				}
			}
		}
	}

create_new_object:

	/* Create and init a new internal ACPI object */

	obj_desc = acpi_ut_create_internal_object((acpi_ps_get_opcode_info
						   (op->common.aml_opcode))->
						  object_type);
	if (!obj_desc) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	status =
	    acpi_ds_init_object_from_op(walk_state, op, op->common.aml_opcode,
					&obj_desc);
	if (ACPI_FAILURE(status)) {
		acpi_ut_remove_reference(obj_desc);
		return_ACPI_STATUS(status);
	}

	/*
	 * Handling for unresolved package reference elements.
	 * These are elements that are namepaths.
	 */
	if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
	    (op->common.parent->common.aml_opcode == AML_VARIABLE_PACKAGE_OP)) {
		obj_desc->reference.resolved = TRUE;

		if ((op->common.aml_opcode == AML_INT_NAMEPATH_OP) &&
		    !obj_desc->reference.node) {
			/*
			 * Name was unresolved above.
			 * Get the prefix node for later lookup
			 */
			obj_desc->reference.node =
			    walk_state->scope_info->scope.node;
			obj_desc->reference.aml = op->common.aml;
			obj_desc->reference.resolved = FALSE;
		}
	}

	*obj_desc_ptr = obj_desc;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_build_internal_buffer_obj
 *
 * PARAMETERS:  walk_state      - Current walk state
 *              op              - Parser object to be translated
 *              buffer_length   - Length of the buffer
 *              obj_desc_ptr    - Where the ACPI internal object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Translate a parser Op package object to the equivalent
 *              namespace object
 *
 ******************************************************************************/

acpi_status
acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state,
				  union acpi_parse_object *op,
				  u32 buffer_length,
				  union acpi_operand_object **obj_desc_ptr)
{
	union acpi_parse_object *arg;
	union acpi_operand_object *obj_desc;
	union acpi_parse_object *byte_list;
	u32 byte_list_length = 0;

	ACPI_FUNCTION_TRACE(ds_build_internal_buffer_obj);

	/*
	 * If we are evaluating a Named buffer object "Name (xxxx, Buffer)".
	 * The buffer object already exists (from the NS node), otherwise it must
	 * be created.
	 */
	obj_desc = *obj_desc_ptr;
	if (!obj_desc) {

		/* Create a new buffer object */

		obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
		*obj_desc_ptr = obj_desc;
		if (!obj_desc) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}
	}

	/*
	 * Second arg is the buffer data (optional) byte_list can be either
	 * individual bytes or a string initializer. In either case, a
	 * byte_list appears in the AML.
	 */
	arg = op->common.value.arg;	/* skip first arg */

	byte_list = arg->named.next;
	if (byte_list) {
		if (byte_list->common.aml_opcode != AML_INT_BYTELIST_OP) {
			ACPI_ERROR((AE_INFO,
				    "Expecting bytelist, found AML opcode 0x%X in op %p",
				    byte_list->common.aml_opcode, byte_list));

			acpi_ut_remove_reference(obj_desc);
			return (AE_TYPE);
		}

		byte_list_length = (u32) byte_list->common.value.integer;
	}

	/*
	 * The buffer length (number of bytes) will be the larger of:
	 * 1) The specified buffer length and
	 * 2) The length of the initializer byte list
	 */
	obj_desc->buffer.length = buffer_length;
	if (byte_list_length > buffer_length) {
		obj_desc->buffer.length = byte_list_length;
	}

	/* Allocate the buffer */

	if (obj_desc->buffer.length == 0) {
		obj_desc->buffer.pointer = NULL;
		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "Buffer defined with zero length in AML, creating\n"));
	} else {
		obj_desc->buffer.pointer =
		    ACPI_ALLOCATE_ZEROED(obj_desc->buffer.length);
		if (!obj_desc->buffer.pointer) {
			acpi_ut_delete_object_desc(obj_desc);
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		/* Initialize buffer from the byte_list (if present) */

		if (byte_list) {
			memcpy(obj_desc->buffer.pointer, byte_list->named.data,
			       byte_list_length);
		}
	}

	obj_desc->buffer.flags |= AOPOBJ_DATA_VALID;
	op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_create_node
 *
 * PARAMETERS:  walk_state      - Current walk state
 *              node            - NS Node to be initialized
 *              op              - Parser object to be translated
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create the object to be associated with a namespace node
 *
 ******************************************************************************/

acpi_status
acpi_ds_create_node(struct acpi_walk_state *walk_state,
		    struct acpi_namespace_node *node,
		    union acpi_parse_object *op)
{
	acpi_status status;
	union acpi_operand_object *obj_desc;

	ACPI_FUNCTION_TRACE_PTR(ds_create_node, op);

	/*
	 * Because of the execution pass through the non-control-method
	 * parts of the table, we can arrive here twice. Only init
	 * the named object node the first time through
	 */
	if (acpi_ns_get_attached_object(node)) {
		return_ACPI_STATUS(AE_OK);
	}

	if (!op->common.value.arg) {

		/* No arguments, there is nothing to do */

		return_ACPI_STATUS(AE_OK);
	}

	/* Build an internal object for the argument(s) */

	status =
	    acpi_ds_build_internal_object(walk_state, op->common.value.arg,
					  &obj_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Re-type the object according to its argument */

	node->type = obj_desc->common.type;

	/* Attach obj to node */

	status = acpi_ns_attach_object(node, obj_desc, node->type);

	/* Remove local reference to the object */

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_init_object_from_op
 *
 * PARAMETERS:  walk_state      - Current walk state
 *              op              - Parser op used to init the internal object
 *              opcode          - AML opcode associated with the object
 *              ret_obj_desc    - Namespace object to be initialized
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize a namespace object from a parser Op and its
 *              associated arguments. The namespace object is a more compact
 *              representation of the Op and its arguments.
 *
 ******************************************************************************/

acpi_status
acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
			    union acpi_parse_object *op,
			    u16 opcode,
			    union acpi_operand_object **ret_obj_desc)
{
	const struct acpi_opcode_info *op_info;
	union acpi_operand_object *obj_desc;
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE(ds_init_object_from_op);

	obj_desc = *ret_obj_desc;
	op_info = acpi_ps_get_opcode_info(opcode);
	if (op_info->class == AML_CLASS_UNKNOWN) {

		/* Unknown opcode */

		return_ACPI_STATUS(AE_TYPE);
	}

	/* Perform per-object initialization */

	switch (obj_desc->common.type) {
	case ACPI_TYPE_BUFFER:
		/*
		 * Defer evaluation of Buffer term_arg operand
		 */
		obj_desc->buffer.node =
		    ACPI_CAST_PTR(struct acpi_namespace_node,
				  walk_state->operands[0]);
		obj_desc->buffer.aml_start = op->named.data;
		obj_desc->buffer.aml_length = op->named.length;
		break;

	case ACPI_TYPE_PACKAGE:
		/*
		 * Defer evaluation of Package term_arg operand and all
		 * package elements. (01/2017): We defer the element
		 * resolution to allow forward references from the package
		 * in order to provide compatibility with other ACPI
		 * implementations.
		 */
		obj_desc->package.node =
		    ACPI_CAST_PTR(struct acpi_namespace_node,
				  walk_state->operands[0]);

		if (!op->named.data) {
			return_ACPI_STATUS(AE_OK);
		}

		obj_desc->package.aml_start = op->named.data;
		obj_desc->package.aml_length = op->named.length;
		break;

	case ACPI_TYPE_INTEGER:

		switch (op_info->type) {
		case AML_TYPE_CONSTANT:
			/*
			 * Resolve AML Constants here - AND ONLY HERE!
			 * All constants are integers.
			 * We mark the integer with a flag that indicates that it started
			 * life as a constant -- so that stores to constants will perform
			 * as expected (noop). zero_op is used as a placeholder for optional
			 * target operands.
			 */
			obj_desc->common.flags = AOPOBJ_AML_CONSTANT;

			switch (opcode) {
			case AML_ZERO_OP:

				obj_desc->integer.value = 0;
				break;

			case AML_ONE_OP:

				obj_desc->integer.value = 1;
				break;

			case AML_ONES_OP:

				obj_desc->integer.value = ACPI_UINT64_MAX;

				/* Truncate value if we are executing from a 32-bit ACPI table */

				(void)acpi_ex_truncate_for32bit_table(obj_desc);
				break;

			case AML_REVISION_OP:

				obj_desc->integer.value = ACPI_CA_VERSION;
				break;

			default:

				ACPI_ERROR((AE_INFO,
					    "Unknown constant opcode 0x%X",
					    opcode));
				status = AE_AML_OPERAND_TYPE;
				break;
			}
			break;

		case AML_TYPE_LITERAL:

			obj_desc->integer.value = op->common.value.integer;

			if (acpi_ex_truncate_for32bit_table(obj_desc)) {

				/* Warn if we found a 64-bit constant in a 32-bit table */

				ACPI_WARNING((AE_INFO,
					      "Truncated 64-bit constant found in 32-bit table: %8.8X%8.8X => %8.8X",
					      ACPI_FORMAT_UINT64(op->common.
								 value.integer),
					      (u32)obj_desc->integer.value));
			}
			break;

		default:

			ACPI_ERROR((AE_INFO, "Unknown Integer type 0x%X",
				    op_info->type));
			status = AE_AML_OPERAND_TYPE;
			break;
		}
		break;

	case ACPI_TYPE_STRING:

		obj_desc->string.pointer = op->common.value.string;
		obj_desc->string.length = (u32)strlen(op->common.value.string);

		/*
		 * The string is contained in the ACPI table, don't ever try
		 * to delete it
		 */
		obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
		break;

	case ACPI_TYPE_METHOD:
		break;

	case ACPI_TYPE_LOCAL_REFERENCE:

		switch (op_info->type) {
		case AML_TYPE_LOCAL_VARIABLE:

			/* Local ID (0-7) is (AML opcode - base AML_FIRST_LOCAL_OP) */

			obj_desc->reference.value =
			    ((u32)opcode) - AML_FIRST_LOCAL_OP;
			obj_desc->reference.class = ACPI_REFCLASS_LOCAL;

			status =
			    acpi_ds_method_data_get_node(ACPI_REFCLASS_LOCAL,
							 obj_desc->reference.
							 value, walk_state,
							 ACPI_CAST_INDIRECT_PTR
							 (struct
							  acpi_namespace_node,
							  &obj_desc->reference.
							  object));
			break;

		case AML_TYPE_METHOD_ARGUMENT:

			/* Arg ID (0-6) is (AML opcode - base AML_FIRST_ARG_OP) */

			obj_desc->reference.value =
			    ((u32)opcode) - AML_FIRST_ARG_OP;
			obj_desc->reference.class = ACPI_REFCLASS_ARG;

			status = acpi_ds_method_data_get_node(ACPI_REFCLASS_ARG,
							      obj_desc->
							      reference.value,
							      walk_state,
							      ACPI_CAST_INDIRECT_PTR
							      (struct
							       acpi_namespace_node,
							       &obj_desc->
							       reference.
							       object));
			break;

		default:	/* Object name or Debug object */

			switch (op->common.aml_opcode) {
			case AML_INT_NAMEPATH_OP:

				/* Node was saved in Op */

				obj_desc->reference.node = op->common.node;
				obj_desc->reference.class = ACPI_REFCLASS_NAME;
				if (op->common.node) {
					obj_desc->reference.object =
					    op->common.node->object;
				}
				break;

			case AML_DEBUG_OP:

				obj_desc->reference.class = ACPI_REFCLASS_DEBUG;
				break;

			default:

				ACPI_ERROR((AE_INFO,
					    "Unimplemented reference type for AML opcode: 0x%4.4X",
					    opcode));
				return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
			}
			break;
		}
		break;

	default:

		ACPI_ERROR((AE_INFO, "Unimplemented data type: 0x%X",
			    obj_desc->common.type));

		status = AE_AML_OPERAND_TYPE;
		break;
	}

	return_ACPI_STATUS(status);
}