aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/resources/rscalc.c
blob: 98176f2fcb5d878442808affed0d4486e8e97fe7 (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
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
/*******************************************************************************
 *
 * Module Name: rscalc - Calculate stream and list lengths
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2005, 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")


/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_byte_stream_length
 *
 * PARAMETERS:  linked_list         - Pointer to the resource linked list
 *              size_needed         - u32 pointer of the size buffer needed
 *                                    to properly return the parsed data
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Takes the resource byte stream and parses it once, calculating
 *              the size buffer needed to hold the linked list that conveys
 *              the resource data.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_byte_stream_length (
	struct acpi_resource            *linked_list,
	acpi_size                       *size_needed)
{
	acpi_size                       byte_stream_size_needed = 0;
	acpi_size                       segment_size;
	u8                              done = FALSE;


	ACPI_FUNCTION_TRACE ("rs_get_byte_stream_length");


	while (!done) {
		/* Init the variable that will hold the size to add to the total. */

		segment_size = 0;

		switch (linked_list->id) {
		case ACPI_RSTYPE_IRQ:
			/*
			 * IRQ Resource
			 * For an IRQ Resource, Byte 3, although optional, will always be
			 * created - it holds IRQ information.
			 */
			segment_size = 4;
			break;

		case ACPI_RSTYPE_DMA:
			/*
			 * DMA Resource
			 * For this resource the size is static
			 */
			segment_size = 3;
			break;

		case ACPI_RSTYPE_START_DPF:
			/*
			 * Start Dependent Functions Resource
			 * For a start_dependent_functions Resource, Byte 1, although
			 * optional, will always be created.
			 */
			segment_size = 2;
			break;

		case ACPI_RSTYPE_END_DPF:
			/*
			 * End Dependent Functions Resource
			 * For this resource the size is static
			 */
			segment_size = 1;
			break;

		case ACPI_RSTYPE_IO:
			/*
			 * IO Port Resource
			 * For this resource the size is static
			 */
			segment_size = 8;
			break;

		case ACPI_RSTYPE_FIXED_IO:
			/*
			 * Fixed IO Port Resource
			 * For this resource the size is static
			 */
			segment_size = 4;
			break;

		case ACPI_RSTYPE_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 (linked_list->data.vendor_specific.length > 7) {
				segment_size = 3;
			}
			else {
				segment_size = 1;
			}
			segment_size += linked_list->data.vendor_specific.length;
			break;

		case ACPI_RSTYPE_END_TAG:
			/*
			 * End Tag
			 * For this resource the size is static
			 */
			segment_size = 2;
			done = TRUE;
			break;

		case ACPI_RSTYPE_MEM24:
			/*
			 * 24-Bit Memory Resource
			 * For this resource the size is static
			 */
			segment_size = 12;
			break;

		case ACPI_RSTYPE_MEM32:
			/*
			 * 32-Bit Memory Range Resource
			 * For this resource the size is static
			 */
			segment_size = 20;
			break;

		case ACPI_RSTYPE_FIXED_MEM32:
			/*
			 * 32-Bit Fixed Memory Resource
			 * For this resource the size is static
			 */
			segment_size = 12;
			break;

		case ACPI_RSTYPE_ADDRESS16:
			/*
			 * 16-Bit Address Resource
			 * The base size of this byte stream is 16. If a Resource Source
			 * string is not NULL, add 1 for the Index + the length of the null
			 * terminated string Resource Source + 1 for the null.
			 */
			segment_size = 16;

			if (linked_list->data.address16.resource_source.string_ptr) {
				segment_size +=
					linked_list->data.address16.resource_source.string_length;
				segment_size++;
			}
			break;

		case ACPI_RSTYPE_ADDRESS32:
			/*
			 * 32-Bit Address Resource
			 * The base size of this byte stream is 26. If a Resource
			 * Source string is not NULL, add 1 for the Index + the
			 * length of the null terminated string Resource Source +
			 * 1 for the null.
			 */
			segment_size = 26;

			if (linked_list->data.address32.resource_source.string_ptr) {
				segment_size +=
					linked_list->data.address32.resource_source.string_length;
				segment_size++;
			}
			break;

		case ACPI_RSTYPE_ADDRESS64:
			/*
			 * 64-Bit Address Resource
			 * The base size of this byte stream is 46. If a resource_source
			 * string is not NULL, add 1 for the Index + the length of the null
			 * terminated string Resource Source + 1 for the null.
			 */
			segment_size = 46;

			if (linked_list->data.address64.resource_source.string_ptr) {
				segment_size +=
					linked_list->data.address64.resource_source.string_length;
				segment_size++;
			}
			break;

		case ACPI_RSTYPE_EXT_IRQ:
			/*
			 * Extended IRQ Resource
			 * The base size of this byte stream is 9. This is for an Interrupt
			 * table length of 1.  For each additional interrupt, add 4.
			 * If a Resource Source string is not NULL, add 1 for the
			 * Index + the length of the null terminated string
			 * Resource Source + 1 for the null.
			 */
			segment_size = 9 + (((acpi_size)
				linked_list->data.extended_irq.number_of_interrupts - 1) * 4);

			if (linked_list->data.extended_irq.resource_source.string_ptr) {
				segment_size +=
					linked_list->data.extended_irq.resource_source.string_length;
				segment_size++;
			}
			break;

		default:

			/* If we get here, everything is out of sync, exit with error */

			return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);

		} /* switch (linked_list->Id) */

		/* Update the total */

		byte_stream_size_needed += segment_size;

		/* Point to the next object */

		linked_list = ACPI_PTR_ADD (struct acpi_resource,
				  linked_list, linked_list->length);
	}

	/* This is the data the caller needs */

	*size_needed = byte_stream_size_needed;
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_list_length
 *
 * PARAMETERS:  byte_stream_buffer      - Pointer to the resource byte stream
 *              byte_stream_buffer_length - Size of byte_stream_buffer
 *              size_needed             - u32 pointer of the size buffer
 *                                        needed to properly return the
 *                                        parsed data
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Takes the resource byte stream and parses it once, calculating
 *              the size buffer needed to hold the linked list that conveys
 *              the resource data.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_list_length (
	u8                              *byte_stream_buffer,
	u32                             byte_stream_buffer_length,
	acpi_size                       *size_needed)
{
	u32                             buffer_size = 0;
	u32                             bytes_parsed = 0;
	u8                              number_of_interrupts = 0;
	u8                              number_of_channels = 0;
	u8                              resource_type;
	u32                             structure_size;
	u32                             bytes_consumed;
	u8                              *buffer;
	u8                              temp8;
	u16                             temp16;
	u8                              index;
	u8                              additional_bytes;


	ACPI_FUNCTION_TRACE ("rs_get_list_length");


	while (bytes_parsed < byte_stream_buffer_length) {
		/* The next byte in the stream is the resource type */

		resource_type = acpi_rs_get_resource_type (*byte_stream_buffer);

		switch (resource_type) {
		case ACPI_RDESC_TYPE_MEMORY_24:
			/*
			 * 24-Bit Memory Resource
			 */
			bytes_consumed = 12;

			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_mem24);
			break;


		case ACPI_RDESC_TYPE_LARGE_VENDOR:
			/*
			 * Vendor Defined Resource
			 */
			buffer = byte_stream_buffer;
			++buffer;

			ACPI_MOVE_16_TO_16 (&temp16, buffer);
			bytes_consumed = temp16 + 3;

			/* Ensure a 32-bit boundary for the structure */

			temp16 = (u16) ACPI_ROUND_UP_to_32_bITS (temp16);

			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_vendor) +
					   (temp16 * sizeof (u8));
			break;


		case ACPI_RDESC_TYPE_MEMORY_32:
			/*
			 * 32-Bit Memory Range Resource
			 */
			bytes_consumed = 20;

			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_mem32);
			break;


		case ACPI_RDESC_TYPE_FIXED_MEMORY_32:
			/*
			 * 32-Bit Fixed Memory Resource
			 */
			bytes_consumed = 12;

			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_fixed_mem32);
			break;


		case ACPI_RDESC_TYPE_EXTENDED_ADDRESS_SPACE:
			/*
			 * 64-Bit Address Resource
			 */
			buffer = byte_stream_buffer;

			++buffer;
			ACPI_MOVE_16_TO_16 (&temp16, buffer);

			bytes_consumed = temp16 + 3;
			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_address64);
			break;


		case ACPI_RDESC_TYPE_QWORD_ADDRESS_SPACE:
			/*
			 * 64-Bit Address Resource
			 */
			buffer = byte_stream_buffer;

			++buffer;
			ACPI_MOVE_16_TO_16 (&temp16, buffer);

			bytes_consumed = temp16 + 3;

			/*
			 * Resource Source Index and Resource Source are optional elements.
			 * Check the length of the Bytestream.  If it is greater than 43,
			 * that means that an Index exists and is followed by a null
			 * terminated string.  Therefore, set the temp variable to the
			 * length minus the minimum byte stream length plus the byte for
			 * the Index to determine the size of the NULL terminated string.
			 */
			if (43 < temp16) {
				temp8 = (u8) (temp16 - 44);
			}
			else {
				temp8 = 0;
			}

			/* Ensure a 64-bit boundary for the structure */

			temp8 = (u8) ACPI_ROUND_UP_to_64_bITS (temp8);

			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_address64) +
					   (temp8 * sizeof (u8));
			break;


		case ACPI_RDESC_TYPE_DWORD_ADDRESS_SPACE:
			/*
			 * 32-Bit Address Resource
			 */
			buffer = byte_stream_buffer;

			++buffer;
			ACPI_MOVE_16_TO_16 (&temp16, buffer);

			bytes_consumed = temp16 + 3;

			/*
			 * Resource Source Index and Resource Source are optional elements.
			 * Check the length of the Bytestream.  If it is greater than 23,
			 * that means that an Index exists and is followed by a null
			 * terminated string.  Therefore, set the temp variable to the
			 * length minus the minimum byte stream length plus the byte for
			 * the Index to determine the size of the NULL terminated string.
			 */
			if (23 < temp16) {
				temp8 = (u8) (temp16 - 24);
			}
			else {
				temp8 = 0;
			}

			/* Ensure a 32-bit boundary for the structure */

			temp8 = (u8) ACPI_ROUND_UP_to_32_bITS (temp8);

			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_address32) +
					   (temp8 * sizeof (u8));
			break;


		case ACPI_RDESC_TYPE_WORD_ADDRESS_SPACE:
			/*
			 * 16-Bit Address Resource
			 */
			buffer = byte_stream_buffer;

			++buffer;
			ACPI_MOVE_16_TO_16 (&temp16, buffer);

			bytes_consumed = temp16 + 3;

			/*
			 * Resource Source Index and Resource Source are optional elements.
			 * Check the length of the Bytestream.  If it is greater than 13,
			 * that means that an Index exists and is followed by a null
			 * terminated string.  Therefore, set the temp variable to the
			 * length minus the minimum byte stream length plus the byte for
			 * the Index to determine the size of the NULL terminated string.
			 */
			if (13 < temp16) {
				temp8 = (u8) (temp16 - 14);
			}
			else {
				temp8 = 0;
			}

			/* Ensure a 32-bit boundary for the structure */

			temp8 = (u8) ACPI_ROUND_UP_to_32_bITS (temp8);

			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_address16) +
					   (temp8 * sizeof (u8));
			break;


		case ACPI_RDESC_TYPE_EXTENDED_XRUPT:
			/*
			 * Extended IRQ
			 */
			buffer = byte_stream_buffer;

			++buffer;
			ACPI_MOVE_16_TO_16 (&temp16, buffer);

			bytes_consumed = temp16 + 3;

			/*
			 * Point past the length field and the Interrupt vector flags to
			 * save off the Interrupt table length to the Temp8 variable.
			 */
			buffer += 3;
			temp8 = *buffer;

			/*
			 * To compensate for multiple interrupt numbers, add 4 bytes for
			 * each additional interrupts greater than 1
			 */
			additional_bytes = (u8) ((temp8 - 1) * 4);

			/*
			 * Resource Source Index and Resource Source are optional elements.
			 * Check the length of the Bytestream.  If it is greater than 9,
			 * that means that an Index exists and is followed by a null
			 * terminated string.  Therefore, set the temp variable to the
			 * length minus the minimum byte stream length plus the byte for
			 * the Index to determine the size of the NULL terminated string.
			 */
			if (9 + additional_bytes < temp16) {
				temp8 = (u8) (temp16 - (9 + additional_bytes));
			}
			else {
				temp8 = 0;
			}

			/* Ensure a 32-bit boundary for the structure */

			temp8 = (u8) ACPI_ROUND_UP_to_32_bITS (temp8);

			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_ext_irq) +
					   (additional_bytes * sizeof (u8)) +
					   (temp8 * sizeof (u8));
			break;


		case ACPI_RDESC_TYPE_IRQ_FORMAT:
			/*
			 * IRQ Resource.
			 * Determine if it there are two or three trailing bytes
			 */
			buffer = byte_stream_buffer;
			temp8 = *buffer;

			if(temp8 & 0x01) {
				bytes_consumed = 4;
			}
			else {
				bytes_consumed = 3;
			}

			/* Point past the descriptor */

			++buffer;

			/* Look at the number of bits set */

			ACPI_MOVE_16_TO_16 (&temp16, buffer);

			for (index = 0; index < 16; index++) {
				if (temp16 & 0x1) {
					++number_of_interrupts;
				}

				temp16 >>= 1;
			}

			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_io) +
					   (number_of_interrupts * sizeof (u32));
			break;


		case ACPI_RDESC_TYPE_DMA_FORMAT:
			/*
			 * DMA Resource
			 */
			buffer = byte_stream_buffer;
			bytes_consumed = 3;

			/* Point past the descriptor */

			++buffer;

			/* Look at the number of bits set */

			temp8 = *buffer;

			for(index = 0; index < 8; index++) {
				if(temp8 & 0x1) {
					++number_of_channels;
				}

				temp8 >>= 1;
			}

			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_dma) +
					   (number_of_channels * sizeof (u32));
			break;


		case ACPI_RDESC_TYPE_START_DEPENDENT:
			/*
			 * Start Dependent Functions Resource
			 * Determine if it there are two or three trailing bytes
			 */
			buffer = byte_stream_buffer;
			temp8 = *buffer;

			if(temp8 & 0x01) {
				bytes_consumed = 2;
			}
			else {
				bytes_consumed = 1;
			}

			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_start_dpf);
			break;


		case ACPI_RDESC_TYPE_END_DEPENDENT:
			/*
			 * End Dependent Functions Resource
			 */
			bytes_consumed = 1;
			structure_size = ACPI_RESOURCE_LENGTH;
			break;


		case ACPI_RDESC_TYPE_IO_PORT:
			/*
			 * IO Port Resource
			 */
			bytes_consumed = 8;
			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_io);
			break;


		case ACPI_RDESC_TYPE_FIXED_IO_PORT:
			/*
			 * Fixed IO Port Resource
			 */
			bytes_consumed = 4;
			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_fixed_io);
			break;


		case ACPI_RDESC_TYPE_SMALL_VENDOR:
			/*
			 * Vendor Specific Resource
			 */
			buffer = byte_stream_buffer;

			temp8 = *buffer;
			temp8 = (u8) (temp8 & 0x7);
			bytes_consumed = temp8 + 1;

			/* Ensure a 32-bit boundary for the structure */

			temp8 = (u8) ACPI_ROUND_UP_to_32_bITS (temp8);
			structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_vendor) +
					   (temp8 * sizeof (u8));
			break;


		case ACPI_RDESC_TYPE_END_TAG:
			/*
			 * End Tag
			 */
			bytes_consumed = 2;
			structure_size = ACPI_RESOURCE_LENGTH;
			byte_stream_buffer_length = bytes_parsed;
			break;


		default:
			/*
			 * If we get here, everything is out of sync,
			 * exit with an error
			 */
			return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
		}

		/* Update the return value and counter */

		buffer_size += (u32) ACPI_ALIGN_RESOURCE_SIZE (structure_size);
		bytes_parsed += bytes_consumed;

		/* Set the byte stream to point to the next resource */

		byte_stream_buffer += bytes_consumed;
	}

	/* This is the data the caller needs */

	*size_needed = buffer_size;
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * 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 ((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_bITS (temp_size_needed);

		/* Point to the next union acpi_operand_object */

		top_object_list++;
	}

	/*
	 * Adding 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);
}