1 /*******************************************************************************
2  *
3  * Module Name: utresrc - Resource management utilities
4  *
5  ******************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2016, 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 #include "acpi.h"
45 #include "accommon.h"
46 #include "acresrc.h"
47 
48 
49 #define _COMPONENT          ACPI_UTILITIES
50         ACPI_MODULE_NAME    ("utresrc")
51 
52 
53 #if defined(ACPI_DEBUG_OUTPUT) || defined (ACPI_DISASSEMBLER) || defined (ACPI_DEBUGGER)
54 
55 /*
56  * Strings used to decode resource descriptors.
57  * Used by both the disassembler and the debugger resource dump routines
58  */
59 const char                      *AcpiGbl_BmDecode[] =
60 {
61     "NotBusMaster",
62     "BusMaster"
63 };
64 
65 const char                      *AcpiGbl_ConfigDecode[] =
66 {
67     "0 - Good Configuration",
68     "1 - Acceptable Configuration",
69     "2 - Suboptimal Configuration",
70     "3 - ***Invalid Configuration***",
71 };
72 
73 const char                      *AcpiGbl_ConsumeDecode[] =
74 {
75     "ResourceProducer",
76     "ResourceConsumer"
77 };
78 
79 const char                      *AcpiGbl_DecDecode[] =
80 {
81     "PosDecode",
82     "SubDecode"
83 };
84 
85 const char                      *AcpiGbl_HeDecode[] =
86 {
87     "Level",
88     "Edge"
89 };
90 
91 const char                      *AcpiGbl_IoDecode[] =
92 {
93     "Decode10",
94     "Decode16"
95 };
96 
97 const char                      *AcpiGbl_LlDecode[] =
98 {
99     "ActiveHigh",
100     "ActiveLow",
101     "ActiveBoth",
102     "Reserved"
103 };
104 
105 const char                      *AcpiGbl_MaxDecode[] =
106 {
107     "MaxNotFixed",
108     "MaxFixed"
109 };
110 
111 const char                      *AcpiGbl_MemDecode[] =
112 {
113     "NonCacheable",
114     "Cacheable",
115     "WriteCombining",
116     "Prefetchable"
117 };
118 
119 const char                      *AcpiGbl_MinDecode[] =
120 {
121     "MinNotFixed",
122     "MinFixed"
123 };
124 
125 const char                      *AcpiGbl_MtpDecode[] =
126 {
127     "AddressRangeMemory",
128     "AddressRangeReserved",
129     "AddressRangeACPI",
130     "AddressRangeNVS"
131 };
132 
133 const char                      *AcpiGbl_RngDecode[] =
134 {
135     "InvalidRanges",
136     "NonISAOnlyRanges",
137     "ISAOnlyRanges",
138     "EntireRange"
139 };
140 
141 const char                      *AcpiGbl_RwDecode[] =
142 {
143     "ReadOnly",
144     "ReadWrite"
145 };
146 
147 const char                      *AcpiGbl_ShrDecode[] =
148 {
149     "Exclusive",
150     "Shared",
151     "ExclusiveAndWake",         /* ACPI 5.0 */
152     "SharedAndWake"             /* ACPI 5.0 */
153 };
154 
155 const char                      *AcpiGbl_SizDecode[] =
156 {
157     "Transfer8",
158     "Transfer8_16",
159     "Transfer16",
160     "InvalidSize"
161 };
162 
163 const char                      *AcpiGbl_TrsDecode[] =
164 {
165     "DenseTranslation",
166     "SparseTranslation"
167 };
168 
169 const char                      *AcpiGbl_TtpDecode[] =
170 {
171     "TypeStatic",
172     "TypeTranslation"
173 };
174 
175 const char                      *AcpiGbl_TypDecode[] =
176 {
177     "Compatibility",
178     "TypeA",
179     "TypeB",
180     "TypeF"
181 };
182 
183 const char                      *AcpiGbl_PpcDecode[] =
184 {
185     "PullDefault",
186     "PullUp",
187     "PullDown",
188     "PullNone"
189 };
190 
191 const char                      *AcpiGbl_IorDecode[] =
192 {
193     "IoRestrictionNone",
194     "IoRestrictionInputOnly",
195     "IoRestrictionOutputOnly",
196     "IoRestrictionNoneAndPreserve"
197 };
198 
199 const char                      *AcpiGbl_DtsDecode[] =
200 {
201     "Width8bit",
202     "Width16bit",
203     "Width32bit",
204     "Width64bit",
205     "Width128bit",
206     "Width256bit",
207 };
208 
209 /* GPIO connection type */
210 
211 const char                      *AcpiGbl_CtDecode[] =
212 {
213     "Interrupt",
214     "I/O"
215 };
216 
217 /* Serial bus type */
218 
219 const char                      *AcpiGbl_SbtDecode[] =
220 {
221     "/* UNKNOWN serial bus type */",
222     "I2C",
223     "SPI",
224     "UART"
225 };
226 
227 /* I2C serial bus access mode */
228 
229 const char                      *AcpiGbl_AmDecode[] =
230 {
231     "AddressingMode7Bit",
232     "AddressingMode10Bit"
233 };
234 
235 /* I2C serial bus slave mode */
236 
237 const char                      *AcpiGbl_SmDecode[] =
238 {
239     "ControllerInitiated",
240     "DeviceInitiated"
241 };
242 
243 /* SPI serial bus wire mode */
244 
245 const char                      *AcpiGbl_WmDecode[] =
246 {
247     "FourWireMode",
248     "ThreeWireMode"
249 };
250 
251 /* SPI serial clock phase */
252 
253 const char                      *AcpiGbl_CphDecode[] =
254 {
255     "ClockPhaseFirst",
256     "ClockPhaseSecond"
257 };
258 
259 /* SPI serial bus clock polarity */
260 
261 const char                      *AcpiGbl_CpoDecode[] =
262 {
263     "ClockPolarityLow",
264     "ClockPolarityHigh"
265 };
266 
267 /* SPI serial bus device polarity */
268 
269 const char                      *AcpiGbl_DpDecode[] =
270 {
271     "PolarityLow",
272     "PolarityHigh"
273 };
274 
275 /* UART serial bus endian */
276 
277 const char                      *AcpiGbl_EdDecode[] =
278 {
279     "LittleEndian",
280     "BigEndian"
281 };
282 
283 /* UART serial bus bits per byte */
284 
285 const char                      *AcpiGbl_BpbDecode[] =
286 {
287     "DataBitsFive",
288     "DataBitsSix",
289     "DataBitsSeven",
290     "DataBitsEight",
291     "DataBitsNine",
292     "/* UNKNOWN Bits per byte */",
293     "/* UNKNOWN Bits per byte */",
294     "/* UNKNOWN Bits per byte */"
295 };
296 
297 /* UART serial bus stop bits */
298 
299 const char                      *AcpiGbl_SbDecode[] =
300 {
301     "StopBitsZero",
302     "StopBitsOne",
303     "StopBitsOnePlusHalf",
304     "StopBitsTwo"
305 };
306 
307 /* UART serial bus flow control */
308 
309 const char                      *AcpiGbl_FcDecode[] =
310 {
311     "FlowControlNone",
312     "FlowControlHardware",
313     "FlowControlXON",
314     "/* UNKNOWN flow control keyword */"
315 };
316 
317 /* UART serial bus parity type */
318 
319 const char                      *AcpiGbl_PtDecode[] =
320 {
321     "ParityTypeNone",
322     "ParityTypeEven",
323     "ParityTypeOdd",
324     "ParityTypeMark",
325     "ParityTypeSpace",
326     "/* UNKNOWN parity keyword */",
327     "/* UNKNOWN parity keyword */",
328     "/* UNKNOWN parity keyword */"
329 };
330 
331 #endif
332 
333 
334 /*
335  * Base sizes of the raw AML resource descriptors, indexed by resource type.
336  * Zero indicates a reserved (and therefore invalid) resource type.
337  */
338 const UINT8                 AcpiGbl_ResourceAmlSizes[] =
339 {
340     /* Small descriptors */
341 
342     0,
343     0,
344     0,
345     0,
346     ACPI_AML_SIZE_SMALL (AML_RESOURCE_IRQ),
347     ACPI_AML_SIZE_SMALL (AML_RESOURCE_DMA),
348     ACPI_AML_SIZE_SMALL (AML_RESOURCE_START_DEPENDENT),
349     ACPI_AML_SIZE_SMALL (AML_RESOURCE_END_DEPENDENT),
350     ACPI_AML_SIZE_SMALL (AML_RESOURCE_IO),
351     ACPI_AML_SIZE_SMALL (AML_RESOURCE_FIXED_IO),
352     ACPI_AML_SIZE_SMALL (AML_RESOURCE_FIXED_DMA),
353     0,
354     0,
355     0,
356     ACPI_AML_SIZE_SMALL (AML_RESOURCE_VENDOR_SMALL),
357     ACPI_AML_SIZE_SMALL (AML_RESOURCE_END_TAG),
358 
359     /* Large descriptors */
360 
361     0,
362     ACPI_AML_SIZE_LARGE (AML_RESOURCE_MEMORY24),
363     ACPI_AML_SIZE_LARGE (AML_RESOURCE_GENERIC_REGISTER),
364     0,
365     ACPI_AML_SIZE_LARGE (AML_RESOURCE_VENDOR_LARGE),
366     ACPI_AML_SIZE_LARGE (AML_RESOURCE_MEMORY32),
367     ACPI_AML_SIZE_LARGE (AML_RESOURCE_FIXED_MEMORY32),
368     ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS32),
369     ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS16),
370     ACPI_AML_SIZE_LARGE (AML_RESOURCE_EXTENDED_IRQ),
371     ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS64),
372     ACPI_AML_SIZE_LARGE (AML_RESOURCE_EXTENDED_ADDRESS64),
373     ACPI_AML_SIZE_LARGE (AML_RESOURCE_GPIO),
374     0,
375     ACPI_AML_SIZE_LARGE (AML_RESOURCE_COMMON_SERIALBUS),
376 };
377 
378 const UINT8                 AcpiGbl_ResourceAmlSerialBusSizes[] =
379 {
380     0,
381     ACPI_AML_SIZE_LARGE (AML_RESOURCE_I2C_SERIALBUS),
382     ACPI_AML_SIZE_LARGE (AML_RESOURCE_SPI_SERIALBUS),
383     ACPI_AML_SIZE_LARGE (AML_RESOURCE_UART_SERIALBUS),
384 };
385 
386 
387 /*
388  * Resource types, used to validate the resource length field.
389  * The length of fixed-length types must match exactly, variable
390  * lengths must meet the minimum required length, etc.
391  * Zero indicates a reserved (and therefore invalid) resource type.
392  */
393 static const UINT8          AcpiGbl_ResourceTypes[] =
394 {
395     /* Small descriptors */
396 
397     0,
398     0,
399     0,
400     0,
401     ACPI_SMALL_VARIABLE_LENGTH,     /* 04 IRQ */
402     ACPI_FIXED_LENGTH,              /* 05 DMA */
403     ACPI_SMALL_VARIABLE_LENGTH,     /* 06 StartDependentFunctions */
404     ACPI_FIXED_LENGTH,              /* 07 EndDependentFunctions */
405     ACPI_FIXED_LENGTH,              /* 08 IO */
406     ACPI_FIXED_LENGTH,              /* 09 FixedIO */
407     ACPI_FIXED_LENGTH,              /* 0A FixedDMA */
408     0,
409     0,
410     0,
411     ACPI_VARIABLE_LENGTH,           /* 0E VendorShort */
412     ACPI_FIXED_LENGTH,              /* 0F EndTag */
413 
414     /* Large descriptors */
415 
416     0,
417     ACPI_FIXED_LENGTH,              /* 01 Memory24 */
418     ACPI_FIXED_LENGTH,              /* 02 GenericRegister */
419     0,
420     ACPI_VARIABLE_LENGTH,           /* 04 VendorLong */
421     ACPI_FIXED_LENGTH,              /* 05 Memory32 */
422     ACPI_FIXED_LENGTH,              /* 06 Memory32Fixed */
423     ACPI_VARIABLE_LENGTH,           /* 07 Dword* address */
424     ACPI_VARIABLE_LENGTH,           /* 08 Word* address */
425     ACPI_VARIABLE_LENGTH,           /* 09 ExtendedIRQ */
426     ACPI_VARIABLE_LENGTH,           /* 0A Qword* address */
427     ACPI_FIXED_LENGTH,              /* 0B Extended* address */
428     ACPI_VARIABLE_LENGTH,           /* 0C Gpio* */
429     0,
430     ACPI_VARIABLE_LENGTH            /* 0E *SerialBus */
431 };
432 
433 
434 /*******************************************************************************
435  *
436  * FUNCTION:    AcpiUtWalkAmlResources
437  *
438  * PARAMETERS:  WalkState           - Current walk info
439  * PARAMETERS:  Aml                 - Pointer to the raw AML resource template
440  *              AmlLength           - Length of the entire template
441  *              UserFunction        - Called once for each descriptor found. If
442  *                                    NULL, a pointer to the EndTag is returned
443  *              Context             - Passed to UserFunction
444  *
445  * RETURN:      Status
446  *
447  * DESCRIPTION: Walk a raw AML resource list(buffer). User function called
448  *              once for each resource found.
449  *
450  ******************************************************************************/
451 
452 ACPI_STATUS
AcpiUtWalkAmlResources(ACPI_WALK_STATE * WalkState,UINT8 * Aml,ACPI_SIZE AmlLength,ACPI_WALK_AML_CALLBACK UserFunction,void ** Context)453 AcpiUtWalkAmlResources (
454     ACPI_WALK_STATE         *WalkState,
455     UINT8                   *Aml,
456     ACPI_SIZE               AmlLength,
457     ACPI_WALK_AML_CALLBACK  UserFunction,
458     void                    **Context)
459 {
460     ACPI_STATUS             Status;
461     UINT8                   *EndAml;
462     UINT8                   ResourceIndex;
463     UINT32                  Length;
464     UINT32                  Offset = 0;
465     UINT8                   EndTag[2] = {0x79, 0x00};
466 
467 
468     ACPI_FUNCTION_TRACE (UtWalkAmlResources);
469 
470 
471     /* The absolute minimum resource template is one EndTag descriptor */
472 
473     if (AmlLength < sizeof (AML_RESOURCE_END_TAG))
474     {
475         return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
476     }
477 
478     /* Point to the end of the resource template buffer */
479 
480     EndAml = Aml + AmlLength;
481 
482     /* Walk the byte list, abort on any invalid descriptor type or length */
483 
484     while (Aml < EndAml)
485     {
486         /* Validate the Resource Type and Resource Length */
487 
488         Status = AcpiUtValidateResource (WalkState, Aml, &ResourceIndex);
489         if (ACPI_FAILURE (Status))
490         {
491             /*
492              * Exit on failure. Cannot continue because the descriptor
493              * length may be bogus also.
494              */
495             return_ACPI_STATUS (Status);
496         }
497 
498         /* Get the length of this descriptor */
499 
500         Length = AcpiUtGetDescriptorLength (Aml);
501 
502         /* Invoke the user function */
503 
504         if (UserFunction)
505         {
506             Status = UserFunction (
507                 Aml, Length, Offset, ResourceIndex, Context);
508             if (ACPI_FAILURE (Status))
509             {
510                 return_ACPI_STATUS (Status);
511             }
512         }
513 
514         /* An EndTag descriptor terminates this resource template */
515 
516         if (AcpiUtGetResourceType (Aml) == ACPI_RESOURCE_NAME_END_TAG)
517         {
518             /*
519              * There must be at least one more byte in the buffer for
520              * the 2nd byte of the EndTag
521              */
522             if ((Aml + 1) >= EndAml)
523             {
524                 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
525             }
526 
527             /* Return the pointer to the EndTag if requested */
528 
529             if (!UserFunction)
530             {
531                 *Context = Aml;
532             }
533 
534             /* Normal exit */
535 
536             return_ACPI_STATUS (AE_OK);
537         }
538 
539         Aml += Length;
540         Offset += Length;
541     }
542 
543     /* Did not find an EndTag descriptor */
544 
545     if (UserFunction)
546     {
547         /* Insert an EndTag anyway. AcpiRsGetListLength always leaves room */
548 
549         (void) AcpiUtValidateResource (WalkState, EndTag, &ResourceIndex);
550         Status = UserFunction (EndTag, 2, Offset, ResourceIndex, Context);
551         if (ACPI_FAILURE (Status))
552         {
553             return_ACPI_STATUS (Status);
554         }
555     }
556 
557     return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
558 }
559 
560 
561 /*******************************************************************************
562  *
563  * FUNCTION:    AcpiUtValidateResource
564  *
565  * PARAMETERS:  WalkState           - Current walk info
566  *              Aml                 - Pointer to the raw AML resource descriptor
567  *              ReturnIndex         - Where the resource index is returned. NULL
568  *                                    if the index is not required.
569  *
570  * RETURN:      Status, and optionally the Index into the global resource tables
571  *
572  * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
573  *              Type and Resource Length. Returns an index into the global
574  *              resource information/dispatch tables for later use.
575  *
576  ******************************************************************************/
577 
578 ACPI_STATUS
AcpiUtValidateResource(ACPI_WALK_STATE * WalkState,void * Aml,UINT8 * ReturnIndex)579 AcpiUtValidateResource (
580     ACPI_WALK_STATE         *WalkState,
581     void                    *Aml,
582     UINT8                   *ReturnIndex)
583 {
584     AML_RESOURCE            *AmlResource;
585     UINT8                   ResourceType;
586     UINT8                   ResourceIndex;
587     ACPI_RS_LENGTH          ResourceLength;
588     ACPI_RS_LENGTH          MinimumResourceLength;
589 
590 
591     ACPI_FUNCTION_ENTRY ();
592 
593 
594     /*
595      * 1) Validate the ResourceType field (Byte 0)
596      */
597     ResourceType = ACPI_GET8 (Aml);
598 
599     /*
600      * Byte 0 contains the descriptor name (Resource Type)
601      * Examine the large/small bit in the resource header
602      */
603     if (ResourceType & ACPI_RESOURCE_NAME_LARGE)
604     {
605         /* Verify the large resource type (name) against the max */
606 
607         if (ResourceType > ACPI_RESOURCE_NAME_LARGE_MAX)
608         {
609             goto InvalidResource;
610         }
611 
612         /*
613          * Large Resource Type -- bits 6:0 contain the name
614          * Translate range 0x80-0x8B to index range 0x10-0x1B
615          */
616         ResourceIndex = (UINT8) (ResourceType - 0x70);
617     }
618     else
619     {
620         /*
621          * Small Resource Type -- bits 6:3 contain the name
622          * Shift range to index range 0x00-0x0F
623          */
624         ResourceIndex = (UINT8)
625             ((ResourceType & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
626     }
627 
628     /*
629      * Check validity of the resource type, via AcpiGbl_ResourceTypes.
630      * Zero indicates an invalid resource.
631      */
632     if (!AcpiGbl_ResourceTypes[ResourceIndex])
633     {
634         goto InvalidResource;
635     }
636 
637     /*
638      * Validate the ResourceLength field. This ensures that the length
639      * is at least reasonable, and guarantees that it is non-zero.
640      */
641     ResourceLength = AcpiUtGetResourceLength (Aml);
642     MinimumResourceLength = AcpiGbl_ResourceAmlSizes[ResourceIndex];
643 
644     /* Validate based upon the type of resource - fixed length or variable */
645 
646     switch (AcpiGbl_ResourceTypes[ResourceIndex])
647     {
648     case ACPI_FIXED_LENGTH:
649 
650         /* Fixed length resource, length must match exactly */
651 
652         if (ResourceLength != MinimumResourceLength)
653         {
654             goto BadResourceLength;
655         }
656         break;
657 
658     case ACPI_VARIABLE_LENGTH:
659 
660         /* Variable length resource, length must be at least the minimum */
661 
662         if (ResourceLength < MinimumResourceLength)
663         {
664             goto BadResourceLength;
665         }
666         break;
667 
668     case ACPI_SMALL_VARIABLE_LENGTH:
669 
670         /* Small variable length resource, length can be (Min) or (Min-1) */
671 
672         if ((ResourceLength > MinimumResourceLength) ||
673             (ResourceLength < (MinimumResourceLength - 1)))
674         {
675             goto BadResourceLength;
676         }
677         break;
678 
679     default:
680 
681         /* Shouldn't happen (because of validation earlier), but be sure */
682 
683         goto InvalidResource;
684     }
685 
686     AmlResource = ACPI_CAST_PTR (AML_RESOURCE, Aml);
687     if (ResourceType == ACPI_RESOURCE_NAME_SERIAL_BUS)
688     {
689         /* Validate the BusType field */
690 
691         if ((AmlResource->CommonSerialBus.Type == 0) ||
692             (AmlResource->CommonSerialBus.Type > AML_RESOURCE_MAX_SERIALBUSTYPE))
693         {
694             if (WalkState)
695             {
696                 ACPI_ERROR ((AE_INFO,
697                     "Invalid/unsupported SerialBus resource descriptor: BusType 0x%2.2X",
698                     AmlResource->CommonSerialBus.Type));
699             }
700             return (AE_AML_INVALID_RESOURCE_TYPE);
701         }
702     }
703 
704     /* Optionally return the resource table index */
705 
706     if (ReturnIndex)
707     {
708         *ReturnIndex = ResourceIndex;
709     }
710 
711     return (AE_OK);
712 
713 
714 InvalidResource:
715 
716     if (WalkState)
717     {
718         ACPI_ERROR ((AE_INFO,
719             "Invalid/unsupported resource descriptor: Type 0x%2.2X",
720             ResourceType));
721     }
722     return (AE_AML_INVALID_RESOURCE_TYPE);
723 
724 BadResourceLength:
725 
726     if (WalkState)
727     {
728         ACPI_ERROR ((AE_INFO,
729             "Invalid resource descriptor length: Type "
730             "0x%2.2X, Length 0x%4.4X, MinLength 0x%4.4X",
731             ResourceType, ResourceLength, MinimumResourceLength));
732     }
733     return (AE_AML_BAD_RESOURCE_LENGTH);
734 }
735 
736 
737 /*******************************************************************************
738  *
739  * FUNCTION:    AcpiUtGetResourceType
740  *
741  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
742  *
743  * RETURN:      The Resource Type with no extraneous bits (except the
744  *              Large/Small descriptor bit -- this is left alone)
745  *
746  * DESCRIPTION: Extract the Resource Type/Name from the first byte of
747  *              a resource descriptor.
748  *
749  ******************************************************************************/
750 
751 UINT8
AcpiUtGetResourceType(void * Aml)752 AcpiUtGetResourceType (
753     void                    *Aml)
754 {
755     ACPI_FUNCTION_ENTRY ();
756 
757 
758     /*
759      * Byte 0 contains the descriptor name (Resource Type)
760      * Examine the large/small bit in the resource header
761      */
762     if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
763     {
764         /* Large Resource Type -- bits 6:0 contain the name */
765 
766         return (ACPI_GET8 (Aml));
767     }
768     else
769     {
770         /* Small Resource Type -- bits 6:3 contain the name */
771 
772         return ((UINT8) (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
773     }
774 }
775 
776 
777 /*******************************************************************************
778  *
779  * FUNCTION:    AcpiUtGetResourceLength
780  *
781  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
782  *
783  * RETURN:      Byte Length
784  *
785  * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
786  *              definition, this does not include the size of the descriptor
787  *              header or the length field itself.
788  *
789  ******************************************************************************/
790 
791 UINT16
AcpiUtGetResourceLength(void * Aml)792 AcpiUtGetResourceLength (
793     void                    *Aml)
794 {
795     ACPI_RS_LENGTH          ResourceLength;
796 
797 
798     ACPI_FUNCTION_ENTRY ();
799 
800 
801     /*
802      * Byte 0 contains the descriptor name (Resource Type)
803      * Examine the large/small bit in the resource header
804      */
805     if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
806     {
807         /* Large Resource type -- bytes 1-2 contain the 16-bit length */
808 
809         ACPI_MOVE_16_TO_16 (&ResourceLength, ACPI_ADD_PTR (UINT8, Aml, 1));
810 
811     }
812     else
813     {
814         /* Small Resource type -- bits 2:0 of byte 0 contain the length */
815 
816         ResourceLength = (UINT16) (ACPI_GET8 (Aml) &
817             ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
818     }
819 
820     return (ResourceLength);
821 }
822 
823 
824 /*******************************************************************************
825  *
826  * FUNCTION:    AcpiUtGetResourceHeaderLength
827  *
828  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
829  *
830  * RETURN:      Length of the AML header (depends on large/small descriptor)
831  *
832  * DESCRIPTION: Get the length of the header for this resource.
833  *
834  ******************************************************************************/
835 
836 UINT8
AcpiUtGetResourceHeaderLength(void * Aml)837 AcpiUtGetResourceHeaderLength (
838     void                    *Aml)
839 {
840     ACPI_FUNCTION_ENTRY ();
841 
842 
843     /* Examine the large/small bit in the resource header */
844 
845     if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
846     {
847         return (sizeof (AML_RESOURCE_LARGE_HEADER));
848     }
849     else
850     {
851         return (sizeof (AML_RESOURCE_SMALL_HEADER));
852     }
853 }
854 
855 
856 /*******************************************************************************
857  *
858  * FUNCTION:    AcpiUtGetDescriptorLength
859  *
860  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
861  *
862  * RETURN:      Byte length
863  *
864  * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
865  *              length of the descriptor header and the length field itself.
866  *              Used to walk descriptor lists.
867  *
868  ******************************************************************************/
869 
870 UINT32
AcpiUtGetDescriptorLength(void * Aml)871 AcpiUtGetDescriptorLength (
872     void                    *Aml)
873 {
874     ACPI_FUNCTION_ENTRY ();
875 
876 
877     /*
878      * Get the Resource Length (does not include header length) and add
879      * the header length (depends on if this is a small or large resource)
880      */
881     return (AcpiUtGetResourceLength (Aml) +
882         AcpiUtGetResourceHeaderLength (Aml));
883 }
884 
885 
886 /*******************************************************************************
887  *
888  * FUNCTION:    AcpiUtGetResourceEndTag
889  *
890  * PARAMETERS:  ObjDesc         - The resource template buffer object
891  *              EndTag          - Where the pointer to the EndTag is returned
892  *
893  * RETURN:      Status, pointer to the end tag
894  *
895  * DESCRIPTION: Find the EndTag resource descriptor in an AML resource template
896  *              Note: allows a buffer length of zero.
897  *
898  ******************************************************************************/
899 
900 ACPI_STATUS
AcpiUtGetResourceEndTag(ACPI_OPERAND_OBJECT * ObjDesc,UINT8 ** EndTag)901 AcpiUtGetResourceEndTag (
902     ACPI_OPERAND_OBJECT     *ObjDesc,
903     UINT8                   **EndTag)
904 {
905     ACPI_STATUS             Status;
906 
907 
908     ACPI_FUNCTION_TRACE (UtGetResourceEndTag);
909 
910 
911     /* Allow a buffer length of zero */
912 
913     if (!ObjDesc->Buffer.Length)
914     {
915         *EndTag = ObjDesc->Buffer.Pointer;
916         return_ACPI_STATUS (AE_OK);
917     }
918 
919     /* Validate the template and get a pointer to the EndTag */
920 
921     Status = AcpiUtWalkAmlResources (NULL, ObjDesc->Buffer.Pointer,
922         ObjDesc->Buffer.Length, NULL, (void **) EndTag);
923 
924     return_ACPI_STATUS (Status);
925 }
926