aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/resources/rscalc.c
blob: dd5caa2c8fdd57f5e5591f50a5704cbbadec91b1 (plain) (blame)
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
/*******************************************************************************
 *
 * Module Name: rscalc - Calculate stream and list lengths
 *
 ******************************************************************************/

/*
 * 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/acresrc.h>
#include <acpi/amlcode.h>
#include <acpi/acnamesp.h>

#define _COMPONENT          ACPI_RESOURCES
ACPI_MODULE_NAME("rscalc")

/* Local prototypes */
static u8 acpi_rs_count_set_bits(u16 bit_field);

static acpi_rs_length
acpi_rs_struct_option_length(struct acpi_resource_source *resource_source);

static u32
acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length);

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_count_set_bits
 *
 * PARAMETERS:  bit_field       - Field in which to count bits
 *
 * RETURN:      Number of bits set within the field
 *
 * DESCRIPTION: Count the number of bits set in a resource field. Used for
 *              (Short descriptor) interrupt and DMA lists.
 *
 ******************************************************************************/

static u8 acpi_rs_count_set_bits(u16 bit_field)
{
	u8 bits_set;

	ACPI_FUNCTION_ENTRY();

	for (bits_set = 0; bit_field; bits_set++) {

		/* Zero the least significant bit that is set */

		bit_field &= (bit_field - 1);
	}

	return (bits_set);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_struct_option_length
 *
 * PARAMETERS:  resource_source     - Pointer to optional descriptor field
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Common code to handle optional resource_source_index and
 *              resource_source fields in some Large descriptors. Used during
 *              list-to-stream conversion
 *
 ******************************************************************************/

static acpi_rs_length
acpi_rs_struct_option_length(struct acpi_resource_source *resource_source)
{
	ACPI_FUNCTION_ENTRY();

	/*
	 * If the resource_source string is valid, return the size of the string
	 * (string_length includes the NULL terminator) plus the size of the
	 * resource_source_index (1).
	 */
	if (resource_source->string_ptr) {
		return ((acpi_rs_length) (resource_source->string_length + 1));
	}

	return (0);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_stream_option_length
 *
 * PARAMETERS:  resource_length     - Length from the resource header
 *              minimum_total_length - Minimum length of this resource, before
 *                                    any optional fields. Includes header size
 *
 * RETURN:      Length of optional string (0 if no string present)
 *
 * DESCRIPTION: Common code to handle optional resource_source_index and
 *              resource_source fields in some Large descriptors. Used during
 *              stream-to-list conversion
 *
 ******************************************************************************/

static u32
acpi_rs_stream_option_length(u32 resource_length,
			     u32 minimum_aml_resource_length)
{
	u32 string_length = 0;

	ACPI_FUNCTION_ENTRY();

	/*
	 * The resource_source_index and resource_source are optional elements of some
	 * Large-type resource descriptors.
	 */

	/*
	 * If the length of the actual resource descriptor is greater than the ACPI
	 * spec-defined minimum length, it means that a resource_source_index exists
	 * and is followed by a (required) null terminated string. The string length
	 * (including the null terminator) is the resource length minus the minimum
	 * length, minus one byte for the resource_source_index itself.
	 */
	if (resource_length > minimum_aml_resource_length) {

		/* Compute the length of the optional string */

		string_length =
		    resource_length - minimum_aml_resource_length - 1;
	}

	/*
	 * Round the length up to a multiple of the native word in order to
	 * guarantee that the entire resource descriptor is native word aligned
	 */
	return ((u32) ACPI_ROUND_UP_TO_NATIVE_WORD(string_length));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_aml_length
 *
 * PARAMETERS:  Resource            - Pointer to the resource linked list
 *              size_needed         - Where the required size is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Takes a linked list of internal resource descriptors and
 *              calculates the size buffer needed to hold the corresponding
 *              external resource byte stream.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_aml_length(struct acpi_resource * resource, acpi_size * size_needed)
{
	acpi_size aml_size_needed = 0;
	acpi_rs_length total_size;

	ACPI_FUNCTION_TRACE("rs_get_aml_length");

	/* Traverse entire list of internal resource descriptors */

	while (resource) {

		/* Validate the descriptor type */

		if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
			return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
		}

		/* Get the base size of the (external stream) resource descriptor */

		total_size = acpi_gbl_aml_resource_sizes[resource->type];

		/*
		 * Augment the base size for descriptors with optional and/or
		 * variable-length fields
		 */
		switch (resource->type) {
		case ACPI_RESOURCE_TYPE_VENDOR:
			/*
			 * Vendor Defined Resource:
			 * For a Vendor Specific resource, if the Length is between 1 and 7
			 * it will be created as a Small Resource data type, otherwise it
			 * is a Large Resource data type.
			 */
			if (resource->data.vendor.byte_length > 7) {

				/* Base size of a Large resource descriptor */

				total_size =
				    sizeof(struct aml_resource_large_header);
			}

			/* Add the size of the vendor-specific data */

			total_size = (acpi_rs_length)
			    (total_size + resource->data.vendor.byte_length);
			break;

		case ACPI_RESOURCE_TYPE_END_TAG:
			/*
			 * End Tag:
			 * We are done -- return the accumulated total size.
			 */
			*size_needed = aml_size_needed + total_size;

			/* Normal exit */

			return_ACPI_STATUS(AE_OK);

		case ACPI_RESOURCE_TYPE_ADDRESS16:
			/*
			 * 16-Bit Address Resource:
			 * Add the size of the optional resource_source info
			 */
			total_size = (acpi_rs_length)
			    (total_size +
			     acpi_rs_struct_option_length(&resource->data.
							  address16.
							  resource_source));
			break;

		case ACPI_RESOURCE_TYPE_ADDRESS32:
			/*
			 * 32-Bit Address Resource:
			 * Add the size of the optional resource_source info
			 */
			total_size = (acpi_rs_length)
			    (total_size +
			     acpi_rs_struct_option_length(&resource->data.
							  address32.
							  resource_source));
			break;

		case ACPI_RESOURCE_TYPE_ADDRESS64:
			/*
			 * 64-Bit Address Resource:
			 * Add the size of the optional resource_source info
			 */
			total_size = (acpi_rs_length)
			    (total_size +
			     acpi_rs_struct_option_length(&resource->data.
							  address64.
							  resource_source));
			break;

		case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
			/*
			 * Extended IRQ Resource:
			 * Add the size of each additional optional interrupt beyond the
			 * required 1 (4 bytes for each u32 interrupt number)
			 */
			total_size = (acpi_rs_length)
			    (total_size +
			     ((resource->data.extended_irq.interrupt_count -
			       1) * 4) +
			     /* Add the size of the optional resource_source info */
			     acpi_rs_struct_option_length(&resource->data.
							  extended_irq.
							  resource_source));
			break;

		default:
			break;
		}

		/* Update the total */

		aml_size_needed += total_size;

		/* Point to the next object */

		resource =
		    ACPI_ADD_PTR(struct acpi_resource, resource,
				 resource->length);
	}

	/* Did not find an end_tag resource descriptor */

	return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_list_length
 *
 * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
 *              aml_buffer_length   - Size of aml_buffer
 *              size_needed         - Where the size needed is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Takes an external resource byte stream and calculates the size
 *              buffer needed to hold the corresponding internal resource
 *              descriptor linked list.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_list_length(u8 * aml_buffer,
			u32 aml_buffer_length, acpi_size * size_needed)
{
	acpi_status status;
	u8 *end_aml;
	u8 *buffer;
	u32 buffer_size;
	u16 temp16;
	u16 resource_length;
	u32 extra_struct_bytes;
	u8 resource_index;
	u8 minimum_aml_resource_length;

	ACPI_FUNCTION_TRACE("rs_get_list_length");

	*size_needed = 0;
	end_aml = aml_buffer + aml_buffer_length;

	/* Walk the list of AML resource descriptors */

	while (aml_buffer < end_aml) {

		/* Validate the Resource Type and Resource Length */

		status = acpi_ut_validate_resource(aml_buffer, &resource_index);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		/* Get the resource length and base (minimum) AML size */

		resource_length = acpi_ut_get_resource_length(aml_buffer);
		minimum_aml_resource_length =
		    acpi_gbl_resource_aml_sizes[resource_index];

		/*
		 * Augment the size for descriptors with optional
		 * and/or variable length fields
		 */
		extra_struct_bytes = 0;
		buffer =
		    aml_buffer + acpi_ut_get_resource_header_length(aml_buffer);

		switch (acpi_ut_get_resource_type(aml_buffer)) {
		case ACPI_RESOURCE_NAME_IRQ:
			/*
			 * IRQ Resource:
			 * Get the number of bits set in the 16-bit IRQ mask
			 */
			ACPI_MOVE_16_TO_16(&temp16, buffer);
			extra_struct_bytes = acpi_rs_count_set_bits(temp16);
			break;

		case ACPI_RESOURCE_NAME_DMA:
			/*
			 * DMA Resource:
			 * Get the number of bits set in the 8-bit DMA mask
			 */
			extra_struct_bytes = acpi_rs_count_set_bits(*buffer);
			break;

		case ACPI_RESOURCE_NAME_VENDOR_SMALL:
		case ACPI_RESOURCE_NAME_VENDOR_LARGE:
			/*
			 * Vendor Resource:
			 * Get the number of vendor data bytes
			 */
			extra_struct_bytes = resource_length;
			break;

		case ACPI_RESOURCE_NAME_END_TAG:
			/*
			 * End Tag:
			 * This is the normal exit, add size of end_tag
			 */
			*size_needed += ACPI_RS_SIZE_MIN;
			return_ACPI_STATUS(AE_OK);

		case ACPI_RESOURCE_NAME_ADDRESS32:
		case ACPI_RESOURCE_NAME_ADDRESS16:
		case ACPI_RESOURCE_NAME_ADDRESS64:
			/*
			 * Address Resource:
			 * Add the size of the optional resource_source
			 */
			extra_struct_bytes =
			    acpi_rs_stream_option_length(resource_length,
							 minimum_aml_resource_length);
			break;

		case ACPI_RESOURCE_NAME_EXTENDED_IRQ:
			/*
			 * Extended IRQ Resource:
			 * Using the interrupt_table_length, add 4 bytes for each additional
			 * interrupt. Note: at least one interrupt is required and is
			 * included in the minimum descriptor size (reason for the -1)
			 */
			extra_struct_bytes = (buffer[1] - 1) * sizeof(u32);

			/* Add the size of the optional resource_source */

			extra_struct_bytes +=
			    acpi_rs_stream_option_length(resource_length -
							 extra_struct_bytes,
							 minimum_aml_resource_length);
			break;

		default:
			break;
		}

		/*
		 * Update the required buffer size for the internal descriptor structs
		 *
		 * Important: Round the size up for the appropriate alignment. This
		 * is a requirement on IA64.
		 */
		buffer_size = acpi_gbl_resource_struct_sizes[resource_index] +
		    extra_struct_bytes;
		buffer_size = ACPI_ROUND_UP_TO_NATIVE_WORD(buffer_size);

		*size_needed += buffer_size;

		ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
				  "Type %.2X, aml_length %.2X internal_length %.2X\n",
				  acpi_ut_get_resource_type(aml_buffer),
				  acpi_ut_get_descriptor_length(aml_buffer),
				  buffer_size));

		/*
		 * Point to the next resource within the AML stream using the length
		 * contained in the resource descriptor header
		 */
		aml_buffer += acpi_ut_get_descriptor_length(aml_buffer);
	}

	/* Did not find an end_tag resource descriptor */

	return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_pci_routing_table_length
 *
 * PARAMETERS:  package_object          - Pointer to the package object
 *              buffer_size_needed      - u32 pointer of the size buffer
 *                                        needed to properly return the
 *                                        parsed data
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Given a package representing a PCI routing table, this
 *              calculates the size of the corresponding linked list of
 *              descriptions.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
				     acpi_size * buffer_size_needed)
{
	u32 number_of_elements;
	acpi_size temp_size_needed = 0;
	union acpi_operand_object **top_object_list;
	u32 index;
	union acpi_operand_object *package_element;
	union acpi_operand_object **sub_object_list;
	u8 name_found;
	u32 table_index;

	ACPI_FUNCTION_TRACE("rs_get_pci_routing_table_length");

	number_of_elements = package_object->package.count;

	/*
	 * Calculate the size of the return buffer.
	 * The base size is the number of elements * the sizes of the
	 * structures.  Additional space for the strings is added below.
	 * The minus one is to subtract the size of the u8 Source[1]
	 * member because it is added below.
	 *
	 * But each PRT_ENTRY structure has a pointer to a string and
	 * the size of that string must be found.
	 */
	top_object_list = package_object->package.elements;

	for (index = 0; index < number_of_elements; index++) {

		/* Dereference the sub-package */

		package_element = *top_object_list;

		/*
		 * The sub_object_list will now point to an array of the
		 * four IRQ elements: Address, Pin, Source and source_index
		 */
		sub_object_list = package_element->package.elements;

		/* Scan the irq_table_elements for the Source Name String */

		name_found = FALSE;

		for (table_index = 0; table_index < 4 && !name_found;
		     table_index++) {
			if (*sub_object_list &&	/* Null object allowed */
			    ((ACPI_TYPE_STRING ==
			      ACPI_GET_OBJECT_TYPE(*sub_object_list)) ||
			     ((ACPI_TYPE_LOCAL_REFERENCE ==
			       ACPI_GET_OBJECT_TYPE(*sub_object_list)) &&
			      ((*sub_object_list)->reference.opcode ==
			       AML_INT_NAMEPATH_OP)))) {
				name_found = TRUE;
			} else {
				/* Look at the next element */

				sub_object_list++;
			}
		}

		temp_size_needed += (sizeof(struct acpi_pci_routing_table) - 4);

		/* Was a String type found? */

		if (name_found) {
			if (ACPI_GET_OBJECT_TYPE(*sub_object_list) ==
			    ACPI_TYPE_STRING) {
				/*
				 * The length String.Length field does not include the
				 * terminating NULL, add 1
				 */
				temp_size_needed += ((acpi_size)
						     (*sub_object_list)->string.
						     length + 1);
			} else {
				temp_size_needed += acpi_ns_get_pathname_length((*sub_object_list)->reference.node);
			}
		} else {
			/*
			 * If no name was found, then this is a NULL, which is
			 * translated as a u32 zero.
			 */
			temp_size_needed += sizeof(u32);
		}

		/* Round up the size since each element must be aligned */

		temp_size_needed = ACPI_ROUND_UP_to_64_bIT(temp_size_needed);

		/* Point to the next union acpi_operand_object */

		top_object_list++;
	}

	/*
	 * Add an extra element to the end of the list, essentially a
	 * NULL terminator
	 */
	*buffer_size_needed =
	    temp_size_needed + sizeof(struct acpi_pci_routing_table);
	return_ACPI_STATUS(AE_OK);
}