summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/utilities/utobject.c
blob: ba7d8ac702df959f7198038182f94af09efba3a6 (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
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
/******************************************************************************
 *
 * Module Name: utobject - ACPI object create/delete/size/cache 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/acnamesp.h>
#include <acpi/amlcode.h>

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utobject")

/* Local prototypes */
static acpi_status
acpi_ut_get_simple_object_size(union acpi_operand_object *obj,
			       acpi_size * obj_length);

static acpi_status
acpi_ut_get_package_object_size(union acpi_operand_object *obj,
				acpi_size * obj_length);

static acpi_status
acpi_ut_get_element_length(u8 object_type,
			   union acpi_operand_object *source_object,
			   union acpi_generic_state *state, void *context);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_internal_object_dbg
 *
 * PARAMETERS:  module_name         - Source file name of caller
 *              line_number         - Line number of caller
 *              component_id        - Component type of caller
 *              Type                - ACPI Type of the new object
 *
 * RETURN:      A new internal object, null on failure
 *
 * DESCRIPTION: Create and initialize a new internal object.
 *
 * NOTE:        We always allocate the worst-case object descriptor because
 *              these objects are cached, and we want them to be
 *              one-size-satisifies-any-request.  This in itself may not be
 *              the most memory efficient, but the efficiency of the object
 *              cache should more than make up for this!
 *
 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_internal_object_dbg(char *module_name,
							      u32 line_number,
							      u32 component_id,
							      acpi_object_type
							      type)
{
	union acpi_operand_object *object;
	union acpi_operand_object *second_object;

	ACPI_FUNCTION_TRACE_STR(ut_create_internal_object_dbg,
				acpi_ut_get_type_name(type));

	/* Allocate the raw object descriptor */

	object =
	    acpi_ut_allocate_object_desc_dbg(module_name, line_number,
					     component_id);
	if (!object) {
		return_PTR(NULL);
	}

	switch (type) {
	case ACPI_TYPE_REGION:
	case ACPI_TYPE_BUFFER_FIELD:

		/* These types require a secondary object */

		second_object = acpi_ut_allocate_object_desc_dbg(module_name,
								 line_number,
								 component_id);
		if (!second_object) {
			acpi_ut_delete_object_desc(object);
			return_PTR(NULL);
		}

		second_object->common.type = ACPI_TYPE_LOCAL_EXTRA;
		second_object->common.reference_count = 1;

		/* Link the second object to the first */

		object->common.next_object = second_object;
		break;

	default:
		/* All others have no secondary object */
		break;
	}

	/* Save the object type in the object descriptor */

	object->common.type = (u8) type;

	/* Init the reference count */

	object->common.reference_count = 1;

	/* Any per-type initialization should go here */

	return_PTR(object);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_buffer_object
 *
 * PARAMETERS:  buffer_size            - Size of buffer to be created
 *
 * RETURN:      Pointer to a new Buffer object, null on failure
 *
 * DESCRIPTION: Create a fully initialized buffer object
 *
 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_buffer_object(acpi_size buffer_size)
{
	union acpi_operand_object *buffer_desc;
	u8 *buffer = NULL;

	ACPI_FUNCTION_TRACE_U32(ut_create_buffer_object, buffer_size);

	/* Create a new Buffer object */

	buffer_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
	if (!buffer_desc) {
		return_PTR(NULL);
	}

	/* Create an actual buffer only if size > 0 */

	if (buffer_size > 0) {

		/* Allocate the actual buffer */

		buffer = ACPI_ALLOCATE_ZEROED(buffer_size);
		if (!buffer) {
			ACPI_ERROR((AE_INFO, "Could not allocate size %X",
				    (u32) buffer_size));
			acpi_ut_remove_reference(buffer_desc);
			return_PTR(NULL);
		}
	}

	/* Complete buffer object initialization */

	buffer_desc->buffer.flags |= AOPOBJ_DATA_VALID;
	buffer_desc->buffer.pointer = buffer;
	buffer_desc->buffer.length = (u32) buffer_size;

	/* Return the new buffer descriptor */

	return_PTR(buffer_desc);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_string_object
 *
 * PARAMETERS:  string_size         - Size of string to be created. Does not
 *                                    include NULL terminator, this is added
 *                                    automatically.
 *
 * RETURN:      Pointer to a new String object
 *
 * DESCRIPTION: Create a fully initialized string object
 *
 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_string_object(acpi_size string_size)
{
	union acpi_operand_object *string_desc;
	char *string;

	ACPI_FUNCTION_TRACE_U32(ut_create_string_object, string_size);

	/* Create a new String object */

	string_desc = acpi_ut_create_internal_object(ACPI_TYPE_STRING);
	if (!string_desc) {
		return_PTR(NULL);
	}

	/*
	 * Allocate the actual string buffer -- (Size + 1) for NULL terminator.
	 * NOTE: Zero-length strings are NULL terminated
	 */
	string = ACPI_ALLOCATE_ZEROED(string_size + 1);
	if (!string) {
		ACPI_ERROR((AE_INFO, "Could not allocate size %X",
			    (u32) string_size));
		acpi_ut_remove_reference(string_desc);
		return_PTR(NULL);
	}

	/* Complete string object initialization */

	string_desc->string.pointer = string;
	string_desc->string.length = (u32) string_size;

	/* Return the new string descriptor */

	return_PTR(string_desc);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_valid_internal_object
 *
 * PARAMETERS:  Object              - Object to be validated
 *
 * RETURN:      TRUE if object is valid, FALSE otherwise
 *
 * DESCRIPTION: Validate a pointer to be an union acpi_operand_object
 *
 ******************************************************************************/

u8 acpi_ut_valid_internal_object(void *object)
{

	ACPI_FUNCTION_NAME(ut_valid_internal_object);

	/* Check for a null pointer */

	if (!object) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "**** Null Object Ptr\n"));
		return (FALSE);
	}

	/* Check the descriptor type field */

	switch (ACPI_GET_DESCRIPTOR_TYPE(object)) {
	case ACPI_DESC_TYPE_OPERAND:

		/* The object appears to be a valid union acpi_operand_object    */

		return (TRUE);

	default:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "%p is not not an ACPI operand obj [%s]\n",
				  object, acpi_ut_get_descriptor_name(object)));
		break;
	}

	return (FALSE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_allocate_object_desc_dbg
 *
 * PARAMETERS:  module_name         - Caller's module name (for error output)
 *              line_number         - Caller's line number (for error output)
 *              component_id        - Caller's component ID (for error output)
 *
 * RETURN:      Pointer to newly allocated object descriptor.  Null on error
 *
 * DESCRIPTION: Allocate a new object descriptor.  Gracefully handle
 *              error conditions.
 *
 ******************************************************************************/

void *acpi_ut_allocate_object_desc_dbg(char *module_name,
				       u32 line_number, u32 component_id)
{
	union acpi_operand_object *object;

	ACPI_FUNCTION_TRACE(ut_allocate_object_desc_dbg);

	object = acpi_os_acquire_object(acpi_gbl_operand_cache);
	if (!object) {
		ACPI_ERROR((module_name, line_number,
			    "Could not allocate an object descriptor"));

		return_PTR(NULL);
	}

	/* Mark the descriptor type */

	memset(object, 0, sizeof(union acpi_operand_object));
	ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_OPERAND);

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "%p Size %X\n",
			  object, (u32) sizeof(union acpi_operand_object)));

	return_PTR(object);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_delete_object_desc
 *
 * PARAMETERS:  Object          - An Acpi internal object to be deleted
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Free an ACPI object descriptor or add it to the object cache
 *
 ******************************************************************************/

void acpi_ut_delete_object_desc(union acpi_operand_object *object)
{
	ACPI_FUNCTION_TRACE_PTR(ut_delete_object_desc, object);

	/* Object must be an union acpi_operand_object    */

	if (ACPI_GET_DESCRIPTOR_TYPE(object) != ACPI_DESC_TYPE_OPERAND) {
		ACPI_ERROR((AE_INFO,
			    "%p is not an ACPI Operand object [%s]", object,
			    acpi_ut_get_descriptor_name(object)));
		return_VOID;
	}

	(void)acpi_os_release_object(acpi_gbl_operand_cache, object);
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_simple_object_size
 *
 * PARAMETERS:  internal_object    - An ACPI operand object
 *              obj_length         - Where the length is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to determine the space required to
 *              contain a simple object for return to an external user.
 *
 *              The length includes the object structure plus any additional
 *              needed space.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_get_simple_object_size(union acpi_operand_object *internal_object,
			       acpi_size * obj_length)
{
	acpi_size length;
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE_PTR(ut_get_simple_object_size, internal_object);

	/*
	 * Handle a null object (Could be a uninitialized package
	 * element -- which is legal)
	 */
	if (!internal_object) {
		*obj_length = 0;
		return_ACPI_STATUS(AE_OK);
	}

	/* Start with the length of the Acpi object */

	length = sizeof(union acpi_object);

	if (ACPI_GET_DESCRIPTOR_TYPE(internal_object) == ACPI_DESC_TYPE_NAMED) {

		/* Object is a named object (reference), just return the length */

		*obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
		return_ACPI_STATUS(status);
	}

	/*
	 * The final length depends on the object type
	 * Strings and Buffers are packed right up against the parent object and
	 * must be accessed bytewise or there may be alignment problems on
	 * certain processors
	 */
	switch (ACPI_GET_OBJECT_TYPE(internal_object)) {
	case ACPI_TYPE_STRING:

		length += (acpi_size) internal_object->string.length + 1;
		break;

	case ACPI_TYPE_BUFFER:

		length += (acpi_size) internal_object->buffer.length;
		break;

	case ACPI_TYPE_INTEGER:
	case ACPI_TYPE_PROCESSOR:
	case ACPI_TYPE_POWER:

		/*
		 * No extra data for these types
		 */
		break;

	case ACPI_TYPE_LOCAL_REFERENCE:

		switch (internal_object->reference.opcode) {
		case AML_INT_NAMEPATH_OP:

			/*
			 * Get the actual length of the full pathname to this object.
			 * The reference will be converted to the pathname to the object
			 */
			length +=
			    ACPI_ROUND_UP_TO_NATIVE_WORD
			    (acpi_ns_get_pathname_length
			     (internal_object->reference.node));
			break;

		default:

			/*
			 * No other reference opcodes are supported.
			 * Notably, Locals and Args are not supported, but this may be
			 * required eventually.
			 */
			ACPI_ERROR((AE_INFO,
				    "Unsupported Reference opcode=%X in object %p",
				    internal_object->reference.opcode,
				    internal_object));
			status = AE_TYPE;
			break;
		}
		break;

	default:

		ACPI_ERROR((AE_INFO, "Unsupported type=%X in object %p",
			    ACPI_GET_OBJECT_TYPE(internal_object),
			    internal_object));
		status = AE_TYPE;
		break;
	}

	/*
	 * Account for the space required by the object rounded up to the next
	 * multiple of the machine word size.  This keeps each object aligned
	 * on a machine word boundary. (preventing alignment faults on some
	 * machines.)
	 */
	*obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_element_length
 *
 * PARAMETERS:  acpi_pkg_callback
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get the length of one package element.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_get_element_length(u8 object_type,
			   union acpi_operand_object *source_object,
			   union acpi_generic_state *state, void *context)
{
	acpi_status status = AE_OK;
	struct acpi_pkg_info *info = (struct acpi_pkg_info *)context;
	acpi_size object_space;

	switch (object_type) {
	case ACPI_COPY_TYPE_SIMPLE:

		/*
		 * Simple object - just get the size (Null object/entry is handled
		 * here also) and sum it into the running package length
		 */
		status =
		    acpi_ut_get_simple_object_size(source_object,
						   &object_space);
		if (ACPI_FAILURE(status)) {
			return (status);
		}

		info->length += object_space;
		break;

	case ACPI_COPY_TYPE_PACKAGE:

		/* Package object - nothing much to do here, let the walk handle it */

		info->num_packages++;
		state->pkg.this_target_obj = NULL;
		break;

	default:

		/* No other types allowed */

		return (AE_BAD_PARAMETER);
	}

	return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_package_object_size
 *
 * PARAMETERS:  internal_object     - An ACPI internal object
 *              obj_length          - Where the length is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to determine the space required to
 *              contain a package object for return to an external user.
 *
 *              This is moderately complex since a package contains other
 *              objects including packages.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_get_package_object_size(union acpi_operand_object *internal_object,
				acpi_size * obj_length)
{
	acpi_status status;
	struct acpi_pkg_info info;

	ACPI_FUNCTION_TRACE_PTR(ut_get_package_object_size, internal_object);

	info.length = 0;
	info.object_space = 0;
	info.num_packages = 1;

	status = acpi_ut_walk_package_tree(internal_object, NULL,
					   acpi_ut_get_element_length, &info);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * We have handled all of the objects in all levels of the package.
	 * just add the length of the package objects themselves.
	 * Round up to the next machine word.
	 */
	info.length += ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object)) *
	    (acpi_size) info.num_packages;

	/* Return the total package length */

	*obj_length = info.length;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_object_size
 *
 * PARAMETERS:  internal_object     - An ACPI internal object
 *              obj_length          - Where the length will be returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to determine the space required to
 *              contain an object for return to an API user.
 *
 ******************************************************************************/

acpi_status
acpi_ut_get_object_size(union acpi_operand_object *internal_object,
			acpi_size * obj_length)
{
	acpi_status status;

	ACPI_FUNCTION_ENTRY();

	if ((ACPI_GET_DESCRIPTOR_TYPE(internal_object) ==
	     ACPI_DESC_TYPE_OPERAND)
	    && (ACPI_GET_OBJECT_TYPE(internal_object) == ACPI_TYPE_PACKAGE)) {
		status =
		    acpi_ut_get_package_object_size(internal_object,
						    obj_length);
	} else {
		status =
		    acpi_ut_get_simple_object_size(internal_object, obj_length);
	}

	return (status);
}