1 /*******************************************************************************
2 *
3 * Module Name: rscalc - Calculate stream and list lengths
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2023, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include "acpi.h"
45 #include "accommon.h"
46 #include "acresrc.h"
47 #include "acnamesp.h"
48
49
50 #define _COMPONENT ACPI_RESOURCES
51 ACPI_MODULE_NAME ("rscalc")
52
53
54 /* Local prototypes */
55
56 static UINT8
57 AcpiRsCountSetBits (
58 UINT16 BitField);
59
60 static ACPI_RS_LENGTH
61 AcpiRsStructOptionLength (
62 ACPI_RESOURCE_SOURCE *ResourceSource);
63
64 static UINT32
65 AcpiRsStreamOptionLength (
66 UINT32 ResourceLength,
67 UINT32 MinimumTotalLength);
68
69
70 /*******************************************************************************
71 *
72 * FUNCTION: AcpiRsCountSetBits
73 *
74 * PARAMETERS: BitField - Field in which to count bits
75 *
76 * RETURN: Number of bits set within the field
77 *
78 * DESCRIPTION: Count the number of bits set in a resource field. Used for
79 * (Short descriptor) interrupt and DMA lists.
80 *
81 ******************************************************************************/
82
83 static UINT8
AcpiRsCountSetBits(UINT16 BitField)84 AcpiRsCountSetBits (
85 UINT16 BitField)
86 {
87 UINT8 BitsSet;
88
89
90 ACPI_FUNCTION_ENTRY ();
91
92
93 for (BitsSet = 0; BitField; BitsSet++)
94 {
95 /* Zero the least significant bit that is set */
96
97 BitField &= (UINT16) (BitField - 1);
98 }
99
100 return (BitsSet);
101 }
102
103
104 /*******************************************************************************
105 *
106 * FUNCTION: AcpiRsStructOptionLength
107 *
108 * PARAMETERS: ResourceSource - Pointer to optional descriptor field
109 *
110 * RETURN: Status
111 *
112 * DESCRIPTION: Common code to handle optional ResourceSourceIndex and
113 * ResourceSource fields in some Large descriptors. Used during
114 * list-to-stream conversion
115 *
116 ******************************************************************************/
117
118 static ACPI_RS_LENGTH
AcpiRsStructOptionLength(ACPI_RESOURCE_SOURCE * ResourceSource)119 AcpiRsStructOptionLength (
120 ACPI_RESOURCE_SOURCE *ResourceSource)
121 {
122 ACPI_FUNCTION_ENTRY ();
123
124
125 /*
126 * If the ResourceSource string is valid, return the size of the string
127 * (StringLength includes the NULL terminator) plus the size of the
128 * ResourceSourceIndex (1).
129 */
130 if (ResourceSource->StringPtr)
131 {
132 return ((ACPI_RS_LENGTH) (ResourceSource->StringLength + 1));
133 }
134
135 return (0);
136 }
137
138
139 /*******************************************************************************
140 *
141 * FUNCTION: AcpiRsStreamOptionLength
142 *
143 * PARAMETERS: ResourceLength - Length from the resource header
144 * MinimumTotalLength - Minimum length of this resource, before
145 * any optional fields. Includes header size
146 *
147 * RETURN: Length of optional string (0 if no string present)
148 *
149 * DESCRIPTION: Common code to handle optional ResourceSourceIndex and
150 * ResourceSource fields in some Large descriptors. Used during
151 * stream-to-list conversion
152 *
153 ******************************************************************************/
154
155 static UINT32
AcpiRsStreamOptionLength(UINT32 ResourceLength,UINT32 MinimumAmlResourceLength)156 AcpiRsStreamOptionLength (
157 UINT32 ResourceLength,
158 UINT32 MinimumAmlResourceLength)
159 {
160 UINT32 StringLength = 0;
161
162
163 ACPI_FUNCTION_ENTRY ();
164
165
166 /*
167 * The ResourceSourceIndex and ResourceSource are optional elements of
168 * some Large-type resource descriptors.
169 */
170
171 /*
172 * If the length of the actual resource descriptor is greater than the
173 * ACPI spec-defined minimum length, it means that a ResourceSourceIndex
174 * exists and is followed by a (required) null terminated string. The
175 * string length (including the null terminator) is the resource length
176 * minus the minimum length, minus one byte for the ResourceSourceIndex
177 * itself.
178 */
179 if (ResourceLength > MinimumAmlResourceLength)
180 {
181 /* Compute the length of the optional string */
182
183 StringLength = ResourceLength - MinimumAmlResourceLength - 1;
184 }
185
186 /*
187 * Round the length up to a multiple of the native word in order to
188 * guarantee that the entire resource descriptor is native word aligned
189 */
190 return ((UINT32) ACPI_ROUND_UP_TO_NATIVE_WORD (StringLength));
191 }
192
193
194 /*******************************************************************************
195 *
196 * FUNCTION: AcpiRsGetAmlLength
197 *
198 * PARAMETERS: Resource - Pointer to the resource linked list
199 * ResourceListSize - Size of the resource linked list
200 * SizeNeeded - Where the required size is returned
201 *
202 * RETURN: Status
203 *
204 * DESCRIPTION: Takes a linked list of internal resource descriptors and
205 * calculates the size buffer needed to hold the corresponding
206 * external resource byte stream.
207 *
208 ******************************************************************************/
209
210 ACPI_STATUS
AcpiRsGetAmlLength(ACPI_RESOURCE * Resource,ACPI_SIZE ResourceListSize,ACPI_SIZE * SizeNeeded)211 AcpiRsGetAmlLength (
212 ACPI_RESOURCE *Resource,
213 ACPI_SIZE ResourceListSize,
214 ACPI_SIZE *SizeNeeded)
215 {
216 ACPI_SIZE AmlSizeNeeded = 0;
217 ACPI_RESOURCE *ResourceEnd;
218 ACPI_RS_LENGTH TotalSize;
219
220
221 ACPI_FUNCTION_TRACE (RsGetAmlLength);
222
223
224 /* Traverse entire list of internal resource descriptors */
225
226 ResourceEnd = ACPI_ADD_PTR (ACPI_RESOURCE, Resource, ResourceListSize);
227 while (Resource < ResourceEnd)
228 {
229 /* Validate the descriptor type */
230
231 if (Resource->Type > ACPI_RESOURCE_TYPE_MAX)
232 {
233 return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
234 }
235
236 /* Sanity check the length. It must not be zero, or we loop forever */
237
238 if (!Resource->Length)
239 {
240 return_ACPI_STATUS (AE_AML_BAD_RESOURCE_LENGTH);
241 }
242
243 /* Get the base size of the (external stream) resource descriptor */
244
245 TotalSize = AcpiGbl_AmlResourceSizes [Resource->Type];
246
247 /*
248 * Augment the base size for descriptors with optional and/or
249 * variable-length fields
250 */
251 switch (Resource->Type)
252 {
253 case ACPI_RESOURCE_TYPE_IRQ:
254
255 /* Length can be 3 or 2 */
256
257 if (Resource->Data.Irq.DescriptorLength == 2)
258 {
259 TotalSize--;
260 }
261 break;
262
263
264 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
265
266 /* Length can be 1 or 0 */
267
268 if (Resource->Data.Irq.DescriptorLength == 0)
269 {
270 TotalSize--;
271 }
272 break;
273
274
275 case ACPI_RESOURCE_TYPE_VENDOR:
276 /*
277 * Vendor Defined Resource:
278 * For a Vendor Specific resource, if the Length is between 1 and 7
279 * it will be created as a Small Resource data type, otherwise it
280 * is a Large Resource data type.
281 */
282 if (Resource->Data.Vendor.ByteLength > 7)
283 {
284 /* Base size of a Large resource descriptor */
285
286 TotalSize = sizeof (AML_RESOURCE_LARGE_HEADER);
287 }
288
289 /* Add the size of the vendor-specific data */
290
291 TotalSize = (ACPI_RS_LENGTH)
292 (TotalSize + Resource->Data.Vendor.ByteLength);
293 break;
294
295
296 case ACPI_RESOURCE_TYPE_END_TAG:
297 /*
298 * End Tag:
299 * We are done -- return the accumulated total size.
300 */
301 *SizeNeeded = AmlSizeNeeded + TotalSize;
302
303 /* Normal exit */
304
305 return_ACPI_STATUS (AE_OK);
306
307
308 case ACPI_RESOURCE_TYPE_ADDRESS16:
309 /*
310 * 16-Bit Address Resource:
311 * Add the size of the optional ResourceSource info
312 */
313 TotalSize = (ACPI_RS_LENGTH) (TotalSize +
314 AcpiRsStructOptionLength (
315 &Resource->Data.Address16.ResourceSource));
316 break;
317
318
319 case ACPI_RESOURCE_TYPE_ADDRESS32:
320 /*
321 * 32-Bit Address Resource:
322 * Add the size of the optional ResourceSource info
323 */
324 TotalSize = (ACPI_RS_LENGTH) (TotalSize +
325 AcpiRsStructOptionLength (
326 &Resource->Data.Address32.ResourceSource));
327 break;
328
329
330 case ACPI_RESOURCE_TYPE_ADDRESS64:
331 /*
332 * 64-Bit Address Resource:
333 * Add the size of the optional ResourceSource info
334 */
335 TotalSize = (ACPI_RS_LENGTH) (TotalSize +
336 AcpiRsStructOptionLength (
337 &Resource->Data.Address64.ResourceSource));
338 break;
339
340
341 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
342 /*
343 * Extended IRQ Resource:
344 * Add the size of each additional optional interrupt beyond the
345 * required 1 (4 bytes for each UINT32 interrupt number)
346 */
347 TotalSize = (ACPI_RS_LENGTH) (TotalSize +
348 ((Resource->Data.ExtendedIrq.InterruptCount - 1) * 4) +
349
350 /* Add the size of the optional ResourceSource info */
351
352 AcpiRsStructOptionLength (
353 &Resource->Data.ExtendedIrq.ResourceSource));
354 break;
355
356
357 case ACPI_RESOURCE_TYPE_GPIO:
358
359 TotalSize = (ACPI_RS_LENGTH) (TotalSize +
360 (Resource->Data.Gpio.PinTableLength * 2) +
361 Resource->Data.Gpio.ResourceSource.StringLength +
362 Resource->Data.Gpio.VendorLength);
363
364 break;
365
366 case ACPI_RESOURCE_TYPE_PIN_FUNCTION:
367
368 TotalSize = (ACPI_RS_LENGTH) (TotalSize +
369 (Resource->Data.PinFunction.PinTableLength * 2) +
370 Resource->Data.PinFunction.ResourceSource.StringLength +
371 Resource->Data.PinFunction.VendorLength);
372
373 break;
374
375 case ACPI_RESOURCE_TYPE_CLOCK_INPUT:
376
377 TotalSize = (ACPI_RS_LENGTH) (TotalSize +
378 Resource->Data.ClockInput.ResourceSource.StringLength);
379
380 break;
381
382
383 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
384
385 TotalSize = AcpiGbl_AmlResourceSerialBusSizes [
386 Resource->Data.CommonSerialBus.Type];
387
388 TotalSize = (ACPI_RS_LENGTH) (TotalSize +
389 Resource->Data.I2cSerialBus.ResourceSource.StringLength +
390 Resource->Data.I2cSerialBus.VendorLength);
391
392 break;
393
394 case ACPI_RESOURCE_TYPE_PIN_CONFIG:
395
396 TotalSize = (ACPI_RS_LENGTH) (TotalSize +
397 (Resource->Data.PinConfig.PinTableLength * 2) +
398 Resource->Data.PinConfig.ResourceSource.StringLength +
399 Resource->Data.PinConfig.VendorLength);
400
401 break;
402
403 case ACPI_RESOURCE_TYPE_PIN_GROUP:
404
405 TotalSize = (ACPI_RS_LENGTH) (TotalSize +
406 (Resource->Data.PinGroup.PinTableLength * 2) +
407 Resource->Data.PinGroup.ResourceLabel.StringLength +
408 Resource->Data.PinGroup.VendorLength);
409
410 break;
411
412 case ACPI_RESOURCE_TYPE_PIN_GROUP_FUNCTION:
413
414 TotalSize = (ACPI_RS_LENGTH) (TotalSize +
415 Resource->Data.PinGroupFunction.ResourceSource.StringLength +
416 Resource->Data.PinGroupFunction.ResourceSourceLabel.StringLength +
417 Resource->Data.PinGroupFunction.VendorLength);
418
419 break;
420
421 case ACPI_RESOURCE_TYPE_PIN_GROUP_CONFIG:
422
423 TotalSize = (ACPI_RS_LENGTH) (TotalSize +
424 Resource->Data.PinGroupConfig.ResourceSource.StringLength +
425 Resource->Data.PinGroupConfig.ResourceSourceLabel.StringLength +
426 Resource->Data.PinGroupConfig.VendorLength);
427
428 break;
429
430 default:
431
432 break;
433 }
434
435 /* Update the total */
436
437 AmlSizeNeeded += TotalSize;
438
439 /* Point to the next object */
440
441 Resource = ACPI_ADD_PTR (ACPI_RESOURCE, Resource, Resource->Length);
442 }
443
444 /* Did not find an EndTag resource descriptor */
445
446 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
447 }
448
449
450 /*******************************************************************************
451 *
452 * FUNCTION: AcpiRsGetListLength
453 *
454 * PARAMETERS: AmlBuffer - Pointer to the resource byte stream
455 * AmlBufferLength - Size of AmlBuffer
456 * SizeNeeded - Where the size needed is returned
457 *
458 * RETURN: Status
459 *
460 * DESCRIPTION: Takes an external resource byte stream and calculates the size
461 * buffer needed to hold the corresponding internal resource
462 * descriptor linked list.
463 *
464 ******************************************************************************/
465
466 ACPI_STATUS
AcpiRsGetListLength(UINT8 * AmlBuffer,UINT32 AmlBufferLength,ACPI_SIZE * SizeNeeded)467 AcpiRsGetListLength (
468 UINT8 *AmlBuffer,
469 UINT32 AmlBufferLength,
470 ACPI_SIZE *SizeNeeded)
471 {
472 ACPI_STATUS Status;
473 UINT8 *EndAml;
474 UINT8 *Buffer;
475 UINT32 BufferSize;
476 UINT16 Temp16;
477 UINT16 ResourceLength;
478 UINT32 ExtraStructBytes;
479 UINT8 ResourceIndex;
480 UINT8 MinimumAmlResourceLength;
481 AML_RESOURCE *AmlResource;
482
483
484 ACPI_FUNCTION_TRACE (RsGetListLength);
485
486
487 *SizeNeeded = ACPI_RS_SIZE_MIN; /* Minimum size is one EndTag */
488 EndAml = AmlBuffer + AmlBufferLength;
489
490 /* Walk the list of AML resource descriptors */
491
492 while (AmlBuffer < EndAml)
493 {
494 /* Validate the Resource Type and Resource Length */
495
496 Status = AcpiUtValidateResource (NULL, AmlBuffer, &ResourceIndex);
497 if (ACPI_FAILURE (Status))
498 {
499 /*
500 * Exit on failure. Cannot continue because the descriptor length
501 * may be bogus also.
502 */
503 return_ACPI_STATUS (Status);
504 }
505
506 AmlResource = (void *) AmlBuffer;
507
508 /* Get the resource length and base (minimum) AML size */
509
510 ResourceLength = AcpiUtGetResourceLength (AmlBuffer);
511 MinimumAmlResourceLength = AcpiGbl_ResourceAmlSizes[ResourceIndex];
512
513 /*
514 * Augment the size for descriptors with optional
515 * and/or variable length fields
516 */
517 ExtraStructBytes = 0;
518 Buffer = AmlBuffer + AcpiUtGetResourceHeaderLength (AmlBuffer);
519
520 switch (AcpiUtGetResourceType (AmlBuffer))
521 {
522 case ACPI_RESOURCE_NAME_IRQ:
523 /*
524 * IRQ Resource:
525 * Get the number of bits set in the 16-bit IRQ mask
526 */
527 ACPI_MOVE_16_TO_16 (&Temp16, Buffer);
528 ExtraStructBytes = AcpiRsCountSetBits (Temp16);
529 break;
530
531
532 case ACPI_RESOURCE_NAME_DMA:
533 /*
534 * DMA Resource:
535 * Get the number of bits set in the 8-bit DMA mask
536 */
537 ExtraStructBytes = AcpiRsCountSetBits (*Buffer);
538 break;
539
540
541 case ACPI_RESOURCE_NAME_VENDOR_SMALL:
542 case ACPI_RESOURCE_NAME_VENDOR_LARGE:
543 /*
544 * Vendor Resource:
545 * Get the number of vendor data bytes
546 */
547 ExtraStructBytes = ResourceLength;
548
549 /*
550 * There is already one byte included in the minimum
551 * descriptor size. If there are extra struct bytes,
552 * subtract one from the count.
553 */
554 if (ExtraStructBytes)
555 {
556 ExtraStructBytes--;
557 }
558 break;
559
560
561 case ACPI_RESOURCE_NAME_END_TAG:
562 /*
563 * End Tag: This is the normal exit
564 */
565 return_ACPI_STATUS (AE_OK);
566
567
568 case ACPI_RESOURCE_NAME_ADDRESS32:
569 case ACPI_RESOURCE_NAME_ADDRESS16:
570 case ACPI_RESOURCE_NAME_ADDRESS64:
571 /*
572 * Address Resource:
573 * Add the size of the optional ResourceSource
574 */
575 ExtraStructBytes = AcpiRsStreamOptionLength (
576 ResourceLength, MinimumAmlResourceLength);
577 break;
578
579
580 case ACPI_RESOURCE_NAME_EXTENDED_IRQ:
581 /*
582 * Extended IRQ Resource:
583 * Using the InterruptTableLength, add 4 bytes for each additional
584 * interrupt. Note: at least one interrupt is required and is
585 * included in the minimum descriptor size (reason for the -1)
586 */
587 ExtraStructBytes = (Buffer[1] - 1) * sizeof (UINT32);
588
589 /* Add the size of the optional ResourceSource */
590
591 ExtraStructBytes += AcpiRsStreamOptionLength (
592 ResourceLength - ExtraStructBytes, MinimumAmlResourceLength);
593 break;
594
595 case ACPI_RESOURCE_NAME_GPIO:
596
597 /* Vendor data is optional */
598
599 if (AmlResource->Gpio.VendorLength)
600 {
601 ExtraStructBytes +=
602 AmlResource->Gpio.VendorOffset -
603 AmlResource->Gpio.PinTableOffset +
604 AmlResource->Gpio.VendorLength;
605 }
606 else
607 {
608 ExtraStructBytes +=
609 AmlResource->LargeHeader.ResourceLength +
610 sizeof (AML_RESOURCE_LARGE_HEADER) -
611 AmlResource->Gpio.PinTableOffset;
612 }
613 break;
614
615 case ACPI_RESOURCE_NAME_PIN_FUNCTION:
616
617 /* Vendor data is optional */
618
619 if (AmlResource->PinFunction.VendorLength)
620 {
621 ExtraStructBytes +=
622 AmlResource->PinFunction.VendorOffset -
623 AmlResource->PinFunction.PinTableOffset +
624 AmlResource->PinFunction.VendorLength;
625 }
626 else
627 {
628 ExtraStructBytes +=
629 AmlResource->LargeHeader.ResourceLength +
630 sizeof (AML_RESOURCE_LARGE_HEADER) -
631 AmlResource->PinFunction.PinTableOffset;
632 }
633 break;
634
635 case ACPI_RESOURCE_NAME_SERIAL_BUS: {
636 /* Avoid undefined behavior: member access within misaligned address */
637
638 AML_RESOURCE_COMMON_SERIALBUS CommonSerialBus;
639 memcpy(&CommonSerialBus, AmlResource, sizeof(CommonSerialBus));
640
641 MinimumAmlResourceLength = AcpiGbl_ResourceAmlSerialBusSizes[
642 CommonSerialBus.Type];
643 ExtraStructBytes +=
644 CommonSerialBus.ResourceLength -
645 MinimumAmlResourceLength;
646 break;
647 }
648
649 case ACPI_RESOURCE_NAME_PIN_CONFIG:
650
651 /* Vendor data is optional */
652
653 if (AmlResource->PinConfig.VendorLength)
654 {
655 ExtraStructBytes +=
656 AmlResource->PinConfig.VendorOffset -
657 AmlResource->PinConfig.PinTableOffset +
658 AmlResource->PinConfig.VendorLength;
659 }
660 else
661 {
662 ExtraStructBytes +=
663 AmlResource->LargeHeader.ResourceLength +
664 sizeof (AML_RESOURCE_LARGE_HEADER) -
665 AmlResource->PinConfig.PinTableOffset;
666 }
667 break;
668
669 case ACPI_RESOURCE_NAME_PIN_GROUP:
670
671 ExtraStructBytes +=
672 AmlResource->PinGroup.VendorOffset -
673 AmlResource->PinGroup.PinTableOffset +
674 AmlResource->PinGroup.VendorLength;
675
676 break;
677
678 case ACPI_RESOURCE_NAME_PIN_GROUP_FUNCTION:
679
680 ExtraStructBytes +=
681 AmlResource->PinGroupFunction.VendorOffset -
682 AmlResource->PinGroupFunction.ResSourceOffset +
683 AmlResource->PinGroupFunction.VendorLength;
684
685 break;
686
687 case ACPI_RESOURCE_NAME_PIN_GROUP_CONFIG:
688
689 ExtraStructBytes +=
690 AmlResource->PinGroupConfig.VendorOffset -
691 AmlResource->PinGroupConfig.ResSourceOffset +
692 AmlResource->PinGroupConfig.VendorLength;
693
694 break;
695
696 case ACPI_RESOURCE_NAME_CLOCK_INPUT:
697 ExtraStructBytes = AcpiRsStreamOptionLength (
698 ResourceLength, MinimumAmlResourceLength);
699
700 break;
701
702 default:
703
704 break;
705 }
706
707 /*
708 * Update the required buffer size for the internal descriptor structs
709 *
710 * Important: Round the size up for the appropriate alignment. This
711 * is a requirement on IA64.
712 */
713 if (AcpiUtGetResourceType (AmlBuffer) ==
714 ACPI_RESOURCE_NAME_SERIAL_BUS)
715 {
716 /* Avoid undefined behavior: member access within misaligned address */
717
718 AML_RESOURCE_COMMON_SERIALBUS CommonSerialBus;
719 memcpy(&CommonSerialBus, AmlResource, sizeof(CommonSerialBus));
720
721 BufferSize = AcpiGbl_ResourceStructSerialBusSizes[
722 CommonSerialBus.Type] + ExtraStructBytes;
723 }
724 else
725 {
726 BufferSize = AcpiGbl_ResourceStructSizes[ResourceIndex] +
727 ExtraStructBytes;
728 }
729
730 BufferSize = (UINT32) ACPI_ROUND_UP_TO_NATIVE_WORD (BufferSize);
731 *SizeNeeded += BufferSize;
732
733 ACPI_DEBUG_PRINT ((ACPI_DB_RESOURCES,
734 "Type %.2X, AmlLength %.2X InternalLength %.2X%8X\n",
735 AcpiUtGetResourceType (AmlBuffer),
736 AcpiUtGetDescriptorLength (AmlBuffer), ACPI_FORMAT_UINT64(*SizeNeeded)));
737
738 /*
739 * Point to the next resource within the AML stream using the length
740 * contained in the resource descriptor header
741 */
742 AmlBuffer += AcpiUtGetDescriptorLength (AmlBuffer);
743 }
744
745 /* Did not find an EndTag resource descriptor */
746
747 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
748 }
749
750
751 /*******************************************************************************
752 *
753 * FUNCTION: AcpiRsGetPciRoutingTableLength
754 *
755 * PARAMETERS: PackageObject - Pointer to the package object
756 * BufferSizeNeeded - UINT32 pointer of the size buffer
757 * needed to properly return the
758 * parsed data
759 *
760 * RETURN: Status
761 *
762 * DESCRIPTION: Given a package representing a PCI routing table, this
763 * calculates the size of the corresponding linked list of
764 * descriptions.
765 *
766 ******************************************************************************/
767
768 ACPI_STATUS
AcpiRsGetPciRoutingTableLength(ACPI_OPERAND_OBJECT * PackageObject,ACPI_SIZE * BufferSizeNeeded)769 AcpiRsGetPciRoutingTableLength (
770 ACPI_OPERAND_OBJECT *PackageObject,
771 ACPI_SIZE *BufferSizeNeeded)
772 {
773 UINT32 NumberOfElements;
774 ACPI_SIZE TempSizeNeeded = 0;
775 ACPI_OPERAND_OBJECT **TopObjectList;
776 UINT32 Index;
777 ACPI_OPERAND_OBJECT *PackageElement;
778 ACPI_OPERAND_OBJECT **SubObjectList;
779 BOOLEAN NameFound;
780 UINT32 TableIndex;
781
782
783 ACPI_FUNCTION_TRACE (RsGetPciRoutingTableLength);
784
785
786 NumberOfElements = PackageObject->Package.Count;
787
788 /*
789 * Calculate the size of the return buffer.
790 * The base size is the number of elements * the sizes of the
791 * structures. Additional space for the strings is added below.
792 * The minus one is to subtract the size of the UINT8 Source[1]
793 * member because it is added below.
794 *
795 * But each PRT_ENTRY structure has a pointer to a string and
796 * the size of that string must be found.
797 */
798 TopObjectList = PackageObject->Package.Elements;
799
800 for (Index = 0; Index < NumberOfElements; Index++)
801 {
802 /* Dereference the subpackage */
803
804 PackageElement = *TopObjectList;
805
806 /* We must have a valid Package object */
807
808 if (!PackageElement ||
809 (PackageElement->Common.Type != ACPI_TYPE_PACKAGE))
810 {
811 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
812 }
813
814 /*
815 * The SubObjectList will now point to an array of the
816 * four IRQ elements: Address, Pin, Source and SourceIndex
817 */
818 SubObjectList = PackageElement->Package.Elements;
819
820 /* Scan the IrqTableElements for the Source Name String */
821
822 NameFound = FALSE;
823
824 for (TableIndex = 0;
825 TableIndex < PackageElement->Package.Count && !NameFound;
826 TableIndex++)
827 {
828 if (*SubObjectList && /* Null object allowed */
829
830 ((ACPI_TYPE_STRING ==
831 (*SubObjectList)->Common.Type) ||
832
833 ((ACPI_TYPE_LOCAL_REFERENCE ==
834 (*SubObjectList)->Common.Type) &&
835
836 ((*SubObjectList)->Reference.Class ==
837 ACPI_REFCLASS_NAME))))
838 {
839 NameFound = TRUE;
840 }
841 else
842 {
843 /* Look at the next element */
844
845 SubObjectList++;
846 }
847 }
848
849 TempSizeNeeded += (sizeof (ACPI_PCI_ROUTING_TABLE) - 4);
850
851 /* Was a String type found? */
852
853 if (NameFound)
854 {
855 if ((*SubObjectList)->Common.Type == ACPI_TYPE_STRING)
856 {
857 /*
858 * The length String.Length field does not include the
859 * terminating NULL, add 1
860 */
861 TempSizeNeeded += ((ACPI_SIZE)
862 (*SubObjectList)->String.Length + 1);
863 }
864 else
865 {
866 TempSizeNeeded += AcpiNsGetPathnameLength (
867 (*SubObjectList)->Reference.Node);
868 }
869 }
870 else
871 {
872 /*
873 * If no name was found, then this is a NULL, which is
874 * translated as a UINT32 zero.
875 */
876 TempSizeNeeded += sizeof (UINT32);
877 }
878
879 /* Round up the size since each element must be aligned */
880
881 TempSizeNeeded = ACPI_ROUND_UP_TO_64BIT (TempSizeNeeded);
882
883 /* Point to the next ACPI_OPERAND_OBJECT */
884
885 TopObjectList++;
886 }
887
888 /*
889 * Add an extra element to the end of the list, essentially a
890 * NULL terminator
891 */
892 *BufferSizeNeeded = TempSizeNeeded + sizeof (ACPI_PCI_ROUTING_TABLE);
893 return_ACPI_STATUS (AE_OK);
894 }
895