1 /*******************************************************************************
2 *
3 * Module Name: rscalc - Calculate stream and list lengths
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2014, 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 MERCHANTIBILITY 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 #define __RSCALC_C__
45
46 #include "acpi.h"
47 #include "accommon.h"
48 #include "acresrc.h"
49 #include "acnamesp.h"
50
51
52 #define _COMPONENT ACPI_RESOURCES
53 ACPI_MODULE_NAME ("rscalc")
54
55
56 /* Local prototypes */
57
58 static UINT8
59 AcpiRsCountSetBits (
60 UINT16 BitField);
61
62 static ACPI_RS_LENGTH
63 AcpiRsStructOptionLength (
64 ACPI_RESOURCE_SOURCE *ResourceSource);
65
66 static UINT32
67 AcpiRsStreamOptionLength (
68 UINT32 ResourceLength,
69 UINT32 MinimumTotalLength);
70
71
72 /*******************************************************************************
73 *
74 * FUNCTION: AcpiRsCountSetBits
75 *
76 * PARAMETERS: BitField - Field in which to count bits
77 *
78 * RETURN: Number of bits set within the field
79 *
80 * DESCRIPTION: Count the number of bits set in a resource field. Used for
81 * (Short descriptor) interrupt and DMA lists.
82 *
83 ******************************************************************************/
84
85 static UINT8
86 AcpiRsCountSetBits (
87 UINT16 BitField)
88 {
89 UINT8 BitsSet;
90
91
92 ACPI_FUNCTION_ENTRY ();
93
94
95 for (BitsSet = 0; BitField; BitsSet++)
96 {
97 /* Zero the least significant bit that is set */
98
99 BitField &= (UINT16) (BitField - 1);
100 }
101
102 return (BitsSet);
103 }
104
105
106 /*******************************************************************************
107 *
108 * FUNCTION: AcpiRsStructOptionLength
109 *
110 * PARAMETERS: ResourceSource - Pointer to optional descriptor field
111 *
112 * RETURN: Status
113 *
114 * DESCRIPTION: Common code to handle optional ResourceSourceIndex and
115 * ResourceSource fields in some Large descriptors. Used during
116 * list-to-stream conversion
117 *
118 ******************************************************************************/
119
120 static ACPI_RS_LENGTH
121 AcpiRsStructOptionLength (
122 ACPI_RESOURCE_SOURCE *ResourceSource)
123 {
124 ACPI_FUNCTION_ENTRY ();
125
126
127 /*
128 * If the ResourceSource string is valid, return the size of the string
129 * (StringLength includes the NULL terminator) plus the size of the
130 * ResourceSourceIndex (1).
131 */
132 if (ResourceSource->StringPtr)
133 {
134 return ((ACPI_RS_LENGTH) (ResourceSource->StringLength + 1));
135 }
136
137 return (0);
138 }
139
140
141 /*******************************************************************************
142 *
143 * FUNCTION: AcpiRsStreamOptionLength
144 *
145 * PARAMETERS: ResourceLength - Length from the resource header
146 * MinimumTotalLength - Minimum length of this resource, before
147 * any optional fields. Includes header size
148 *
149 * RETURN: Length of optional string (0 if no string present)
150 *
151 * DESCRIPTION: Common code to handle optional ResourceSourceIndex and
152 * ResourceSource fields in some Large descriptors. Used during
153 * stream-to-list conversion
154 *
155 ******************************************************************************/
156
157 static UINT32
158 AcpiRsStreamOptionLength (
159 UINT32 ResourceLength,
160 UINT32 MinimumAmlResourceLength)
161 {
162 UINT32 StringLength = 0;
163
164
165 ACPI_FUNCTION_ENTRY ();
166
167
168 /*
169 * The ResourceSourceIndex and ResourceSource are optional elements of some
170 * Large-type resource descriptors.
171 */
172
173 /*
174 * If the length of the actual resource descriptor is greater than the ACPI
175 * spec-defined minimum length, it means that a ResourceSourceIndex exists
176 * and is followed by a (required) null terminated string. The string length
177 * (including the null terminator) is the resource length minus the minimum
178 * length, minus one byte for the ResourceSourceIndex itself.
179 */
180 if (ResourceLength > MinimumAmlResourceLength)
181 {
182 /* Compute the length of the optional string */
183
184 StringLength = ResourceLength - MinimumAmlResourceLength - 1;
185 }
186
187 /*
188 * Round the length up to a multiple of the native word in order to
189 * guarantee that the entire resource descriptor is native word aligned
190 */
191 return ((UINT32) ACPI_ROUND_UP_TO_NATIVE_WORD (StringLength));
192 }
193
194
195 /*******************************************************************************
196 *
197 * FUNCTION: AcpiRsGetAmlLength
198 *
199 * PARAMETERS: Resource - Pointer to the resource linked list
200 * ResourceListSize - Size of the resource linked list
201 * SizeNeeded - Where the required size is returned
202 *
203 * RETURN: Status
204 *
205 * DESCRIPTION: Takes a linked list of internal resource descriptors and
206 * calculates the size buffer needed to hold the corresponding
207 * external resource byte stream.
208 *
209 ******************************************************************************/
210
211 ACPI_STATUS
212 AcpiRsGetAmlLength (
213 ACPI_RESOURCE *Resource,
214 ACPI_SIZE ResourceListSize,
215 ACPI_SIZE *SizeNeeded)
216 {
217 ACPI_SIZE AmlSizeNeeded = 0;
218 ACPI_RESOURCE *ResourceEnd;
219 ACPI_RS_LENGTH TotalSize;
220
221
222 ACPI_FUNCTION_TRACE (RsGetAmlLength);
223
224
225 /* Traverse entire list of internal resource descriptors */
226
227 ResourceEnd = ACPI_ADD_PTR (ACPI_RESOURCE, Resource, ResourceListSize);
228 while (Resource < ResourceEnd)
229 {
230 /* Validate the descriptor type */
231
232 if (Resource->Type > ACPI_RESOURCE_TYPE_MAX)
233 {
234 return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
235 }
236
237 /* Sanity check the length. It must not be zero, or we loop forever */
238
239 if (!Resource->Length)
240 {
241 return_ACPI_STATUS (AE_AML_BAD_RESOURCE_LENGTH);
242 }
243
244 /* Get the base size of the (external stream) resource descriptor */
245
246 TotalSize = AcpiGbl_AmlResourceSizes [Resource->Type];
247
248 /*
249 * Augment the base size for descriptors with optional and/or
250 * variable-length fields
251 */
252 switch (Resource->Type)
253 {
254 case ACPI_RESOURCE_TYPE_IRQ:
255
256 /* Length can be 3 or 2 */
257
258 if (Resource->Data.Irq.DescriptorLength == 2)
259 {
260 TotalSize--;
261 }
262 break;
263
264
265 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
266
267 /* Length can be 1 or 0 */
268
269 if (Resource->Data.Irq.DescriptorLength == 0)
270 {
271 TotalSize--;
272 }
273 break;
274
275
276 case ACPI_RESOURCE_TYPE_VENDOR:
277 /*
278 * Vendor Defined Resource:
279 * For a Vendor Specific resource, if the Length is between 1 and 7
280 * it will be created as a Small Resource data type, otherwise it
281 * is a Large Resource data type.
282 */
283 if (Resource->Data.Vendor.ByteLength > 7)
284 {
285 /* Base size of a Large resource descriptor */
286
287 TotalSize = sizeof (AML_RESOURCE_LARGE_HEADER);
288 }
289
290 /* Add the size of the vendor-specific data */
291
292 TotalSize = (ACPI_RS_LENGTH)
293 (TotalSize + Resource->Data.Vendor.ByteLength);
294 break;
295
296
297 case ACPI_RESOURCE_TYPE_END_TAG:
298 /*
299 * End Tag:
300 * We are done -- return the accumulated total size.
301 */
302 *SizeNeeded = AmlSizeNeeded + TotalSize;
303
304 /* Normal exit */
305
306 return_ACPI_STATUS (AE_OK);
307
308
309 case ACPI_RESOURCE_TYPE_ADDRESS16:
310 /*
311 * 16-Bit Address Resource:
312 * Add the size of the optional ResourceSource info
313 */
314 TotalSize = (ACPI_RS_LENGTH)
315 (TotalSize + AcpiRsStructOptionLength (
316 &Resource->Data.Address16.ResourceSource));
317 break;
318
319
320 case ACPI_RESOURCE_TYPE_ADDRESS32:
321 /*
322 * 32-Bit Address Resource:
323 * Add the size of the optional ResourceSource info
324 */
325 TotalSize = (ACPI_RS_LENGTH)
326 (TotalSize + AcpiRsStructOptionLength (
327 &Resource->Data.Address32.ResourceSource));
328 break;
329
330
331 case ACPI_RESOURCE_TYPE_ADDRESS64:
332 /*
333 * 64-Bit Address Resource:
334 * Add the size of the optional ResourceSource info
335 */
336 TotalSize = (ACPI_RS_LENGTH)
337 (TotalSize + AcpiRsStructOptionLength (
338 &Resource->Data.Address64.ResourceSource));
339 break;
340
341
342 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
343 /*
344 * Extended IRQ Resource:
345 * Add the size of each additional optional interrupt beyond the
346 * required 1 (4 bytes for each UINT32 interrupt number)
347 */
348 TotalSize = (ACPI_RS_LENGTH)
349 (TotalSize +
350 ((Resource->Data.ExtendedIrq.InterruptCount - 1) * 4) +
351
352 /* Add the size of the optional ResourceSource info */
353
354 AcpiRsStructOptionLength (
355 &Resource->Data.ExtendedIrq.ResourceSource));
356 break;
357
358
359 case ACPI_RESOURCE_TYPE_GPIO:
360
361 TotalSize = (ACPI_RS_LENGTH) (TotalSize + (Resource->Data.Gpio.PinTableLength * 2) +
362 Resource->Data.Gpio.ResourceSource.StringLength +
363 Resource->Data.Gpio.VendorLength);
364
365 break;
366
367
368 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
369
370 TotalSize = AcpiGbl_AmlResourceSerialBusSizes [Resource->Data.CommonSerialBus.Type];
371
372 TotalSize = (ACPI_RS_LENGTH) (TotalSize +
373 Resource->Data.I2cSerialBus.ResourceSource.StringLength +
374 Resource->Data.I2cSerialBus.VendorLength);
375
376 break;
377
378 default:
379
380 break;
381 }
382
383 /* Update the total */
384
385 AmlSizeNeeded += TotalSize;
386
387 /* Point to the next object */
388
389 Resource = ACPI_ADD_PTR (ACPI_RESOURCE, Resource, Resource->Length);
390 }
391
392 /* Did not find an EndTag resource descriptor */
393
394 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
395 }
396
397
398 /*******************************************************************************
399 *
400 * FUNCTION: AcpiRsGetListLength
401 *
402 * PARAMETERS: AmlBuffer - Pointer to the resource byte stream
403 * AmlBufferLength - Size of AmlBuffer
404 * SizeNeeded - Where the size needed is returned
405 *
406 * RETURN: Status
407 *
408 * DESCRIPTION: Takes an external resource byte stream and calculates the size
409 * buffer needed to hold the corresponding internal resource
410 * descriptor linked list.
411 *
412 ******************************************************************************/
413
414 ACPI_STATUS
415 AcpiRsGetListLength (
416 UINT8 *AmlBuffer,
417 UINT32 AmlBufferLength,
418 ACPI_SIZE *SizeNeeded)
419 {
420 ACPI_STATUS Status;
421 UINT8 *EndAml;
422 UINT8 *Buffer;
423 UINT32 BufferSize;
424 UINT16 Temp16;
425 UINT16 ResourceLength;
426 UINT32 ExtraStructBytes;
427 UINT8 ResourceIndex;
428 UINT8 MinimumAmlResourceLength;
429 AML_RESOURCE *AmlResource;
430
431
432 ACPI_FUNCTION_TRACE (RsGetListLength);
433
434
435 *SizeNeeded = ACPI_RS_SIZE_MIN; /* Minimum size is one EndTag */
436 EndAml = AmlBuffer + AmlBufferLength;
437
438 /* Walk the list of AML resource descriptors */
439
440 while (AmlBuffer < EndAml)
441 {
442 /* Validate the Resource Type and Resource Length */
443
444 Status = AcpiUtValidateResource (NULL, AmlBuffer, &ResourceIndex);
445 if (ACPI_FAILURE (Status))
446 {
447 /*
448 * Exit on failure. Cannot continue because the descriptor length
449 * may be bogus also.
450 */
451 return_ACPI_STATUS (Status);
452 }
453
454 AmlResource = (void *) AmlBuffer;
455
456 /* Get the resource length and base (minimum) AML size */
457
458 ResourceLength = AcpiUtGetResourceLength (AmlBuffer);
459 MinimumAmlResourceLength = AcpiGbl_ResourceAmlSizes[ResourceIndex];
460
461 /*
462 * Augment the size for descriptors with optional
463 * and/or variable length fields
464 */
465 ExtraStructBytes = 0;
466 Buffer = AmlBuffer + AcpiUtGetResourceHeaderLength (AmlBuffer);
467
468 switch (AcpiUtGetResourceType (AmlBuffer))
469 {
470 case ACPI_RESOURCE_NAME_IRQ:
471 /*
472 * IRQ Resource:
473 * Get the number of bits set in the 16-bit IRQ mask
474 */
475 ACPI_MOVE_16_TO_16 (&Temp16, Buffer);
476 ExtraStructBytes = AcpiRsCountSetBits (Temp16);
477 break;
478
479
480 case ACPI_RESOURCE_NAME_DMA:
481 /*
482 * DMA Resource:
483 * Get the number of bits set in the 8-bit DMA mask
484 */
485 ExtraStructBytes = AcpiRsCountSetBits (*Buffer);
486 break;
487
488
489 case ACPI_RESOURCE_NAME_VENDOR_SMALL:
490 case ACPI_RESOURCE_NAME_VENDOR_LARGE:
491 /*
492 * Vendor Resource:
493 * Get the number of vendor data bytes
494 */
495 ExtraStructBytes = ResourceLength;
496
497 /*
498 * There is already one byte included in the minimum
499 * descriptor size. If there are extra struct bytes,
500 * subtract one from the count.
501 */
502 if (ExtraStructBytes)
503 {
504 ExtraStructBytes--;
505 }
506 break;
507
508
509 case ACPI_RESOURCE_NAME_END_TAG:
510 /*
511 * End Tag: This is the normal exit
512 */
513 return_ACPI_STATUS (AE_OK);
514
515
516 case ACPI_RESOURCE_NAME_ADDRESS32:
517 case ACPI_RESOURCE_NAME_ADDRESS16:
518 case ACPI_RESOURCE_NAME_ADDRESS64:
519 /*
520 * Address Resource:
521 * Add the size of the optional ResourceSource
522 */
523 ExtraStructBytes = AcpiRsStreamOptionLength (
524 ResourceLength, MinimumAmlResourceLength);
525 break;
526
527
528 case ACPI_RESOURCE_NAME_EXTENDED_IRQ:
529 /*
530 * Extended IRQ Resource:
531 * Using the InterruptTableLength, add 4 bytes for each additional
532 * interrupt. Note: at least one interrupt is required and is
533 * included in the minimum descriptor size (reason for the -1)
534 */
535 ExtraStructBytes = (Buffer[1] - 1) * sizeof (UINT32);
536
537 /* Add the size of the optional ResourceSource */
538
539 ExtraStructBytes += AcpiRsStreamOptionLength (
540 ResourceLength - ExtraStructBytes, MinimumAmlResourceLength);
541 break;
542
543 case ACPI_RESOURCE_NAME_GPIO:
544
545 /* Vendor data is optional */
546
547 if (AmlResource->Gpio.VendorLength)
548 {
549 ExtraStructBytes += AmlResource->Gpio.VendorOffset -
550 AmlResource->Gpio.PinTableOffset + AmlResource->Gpio.VendorLength;
551 }
552 else
553 {
554 ExtraStructBytes += AmlResource->LargeHeader.ResourceLength +
555 sizeof (AML_RESOURCE_LARGE_HEADER) -
556 AmlResource->Gpio.PinTableOffset;
557 }
558 break;
559
560 case ACPI_RESOURCE_NAME_SERIAL_BUS:
561
562 MinimumAmlResourceLength = AcpiGbl_ResourceAmlSerialBusSizes[
563 AmlResource->CommonSerialBus.Type];
564 ExtraStructBytes += AmlResource->CommonSerialBus.ResourceLength -
565 MinimumAmlResourceLength;
566 break;
567
568 default:
569
570 break;
571 }
572
573 /*
574 * Update the required buffer size for the internal descriptor structs
575 *
576 * Important: Round the size up for the appropriate alignment. This
577 * is a requirement on IA64.
578 */
579 if (AcpiUtGetResourceType (AmlBuffer) == ACPI_RESOURCE_NAME_SERIAL_BUS)
580 {
581 BufferSize = AcpiGbl_ResourceStructSerialBusSizes[
582 AmlResource->CommonSerialBus.Type] + ExtraStructBytes;
583 }
584 else
585 {
586 BufferSize = AcpiGbl_ResourceStructSizes[ResourceIndex] +
587 ExtraStructBytes;
588 }
589 BufferSize = (UINT32) ACPI_ROUND_UP_TO_NATIVE_WORD (BufferSize);
590
591 *SizeNeeded += BufferSize;
592
593 ACPI_DEBUG_PRINT ((ACPI_DB_RESOURCES,
594 "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
595 AcpiUtGetResourceType (AmlBuffer),
596 AcpiUtGetDescriptorLength (AmlBuffer), BufferSize));
597
598 /*
599 * Point to the next resource within the AML stream using the length
600 * contained in the resource descriptor header
601 */
602 AmlBuffer += AcpiUtGetDescriptorLength (AmlBuffer);
603 }
604
605 /* Did not find an EndTag resource descriptor */
606
607 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
608 }
609
610
611 /*******************************************************************************
612 *
613 * FUNCTION: AcpiRsGetPciRoutingTableLength
614 *
615 * PARAMETERS: PackageObject - Pointer to the package object
616 * BufferSizeNeeded - UINT32 pointer of the size buffer
617 * needed to properly return the
618 * parsed data
619 *
620 * RETURN: Status
621 *
622 * DESCRIPTION: Given a package representing a PCI routing table, this
623 * calculates the size of the corresponding linked list of
624 * descriptions.
625 *
626 ******************************************************************************/
627
628 ACPI_STATUS
629 AcpiRsGetPciRoutingTableLength (
630 ACPI_OPERAND_OBJECT *PackageObject,
631 ACPI_SIZE *BufferSizeNeeded)
632 {
633 UINT32 NumberOfElements;
634 ACPI_SIZE TempSizeNeeded = 0;
635 ACPI_OPERAND_OBJECT **TopObjectList;
636 UINT32 Index;
637 ACPI_OPERAND_OBJECT *PackageElement;
638 ACPI_OPERAND_OBJECT **SubObjectList;
639 BOOLEAN NameFound;
640 UINT32 TableIndex;
641
642
643 ACPI_FUNCTION_TRACE (RsGetPciRoutingTableLength);
644
645
646 NumberOfElements = PackageObject->Package.Count;
647
648 /*
649 * Calculate the size of the return buffer.
650 * The base size is the number of elements * the sizes of the
651 * structures. Additional space for the strings is added below.
652 * The minus one is to subtract the size of the UINT8 Source[1]
653 * member because it is added below.
654 *
655 * But each PRT_ENTRY structure has a pointer to a string and
656 * the size of that string must be found.
657 */
658 TopObjectList = PackageObject->Package.Elements;
659
660 for (Index = 0; Index < NumberOfElements; Index++)
661 {
662 /* Dereference the sub-package */
663
664 PackageElement = *TopObjectList;
665
666 /* We must have a valid Package object */
667
668 if (!PackageElement ||
669 (PackageElement->Common.Type != ACPI_TYPE_PACKAGE))
670 {
671 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
672 }
673
674 /*
675 * The SubObjectList will now point to an array of the
676 * four IRQ elements: Address, Pin, Source and SourceIndex
677 */
678 SubObjectList = PackageElement->Package.Elements;
679
680 /* Scan the IrqTableElements for the Source Name String */
681
682 NameFound = FALSE;
683
684 for (TableIndex = 0;
685 TableIndex < PackageElement->Package.Count && !NameFound;
686 TableIndex++)
687 {
688 if (*SubObjectList && /* Null object allowed */
689
690 ((ACPI_TYPE_STRING ==
691 (*SubObjectList)->Common.Type) ||
692
693 ((ACPI_TYPE_LOCAL_REFERENCE ==
694 (*SubObjectList)->Common.Type) &&
695
696 ((*SubObjectList)->Reference.Class ==
697 ACPI_REFCLASS_NAME))))
698 {
699 NameFound = TRUE;
700 }
701 else
702 {
703 /* Look at the next element */
704
705 SubObjectList++;
706 }
707 }
708
709 TempSizeNeeded += (sizeof (ACPI_PCI_ROUTING_TABLE) - 4);
710
711 /* Was a String type found? */
712
713 if (NameFound)
714 {
715 if ((*SubObjectList)->Common.Type == ACPI_TYPE_STRING)
716 {
717 /*
718 * The length String.Length field does not include the
719 * terminating NULL, add 1
720 */
721 TempSizeNeeded += ((ACPI_SIZE)
722 (*SubObjectList)->String.Length + 1);
723 }
724 else
725 {
726 TempSizeNeeded += AcpiNsGetPathnameLength (
727 (*SubObjectList)->Reference.Node);
728 }
729 }
730 else
731 {
732 /*
733 * If no name was found, then this is a NULL, which is
734 * translated as a UINT32 zero.
735 */
736 TempSizeNeeded += sizeof (UINT32);
737 }
738
739 /* Round up the size since each element must be aligned */
740
741 TempSizeNeeded = ACPI_ROUND_UP_TO_64BIT (TempSizeNeeded);
742
743 /* Point to the next ACPI_OPERAND_OBJECT */
744
745 TopObjectList++;
746 }
747
748 /*
749 * Add an extra element to the end of the list, essentially a
750 * NULL terminator
751 */
752 *BufferSizeNeeded = TempSizeNeeded + sizeof (ACPI_PCI_ROUTING_TABLE);
753 return_ACPI_STATUS (AE_OK);
754 }