1 /*******************************************************************************
2 *
3 * Module Name: utresrc - Resource management utilities
4 *
5 ******************************************************************************/
6
7 /******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2023, Intel Corp.
12 * All rights reserved.
13 *
14 * 2. License
15 *
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
19 * property rights.
20 *
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
27 *
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
53 *
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
64 * make.
65 *
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
74 *
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
79 *
80 * 4. Disclaimer and Export Compliance
81 *
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88 * PARTICULAR PURPOSE.
89 *
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97 * LIMITED REMEDY.
98 *
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
113 *
114 *****************************************************************************
115 *
116 * Alternatively, you may choose to be licensed under the terms of the
117 * following license:
118 *
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
121 * are met:
122 * 1. Redistributions of source code must retain the above copyright
123 * notice, this list of conditions, and the following disclaimer,
124 * without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 * substantially similar to the "NO WARRANTY" disclaimer below
127 * ("Disclaimer") and any redistribution must be conditioned upon
128 * including a substantially similar Disclaimer requirement for further
129 * binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 * of any contributors may be used to endorse or promote products derived
132 * from this software without specific prior written permission.
133 *
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
145 *
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
149 *
150 *****************************************************************************/
151
152 #include "acpi.h"
153 #include "accommon.h"
154 #include "acresrc.h"
155
156
157 #define _COMPONENT ACPI_UTILITIES
158 ACPI_MODULE_NAME ("utresrc")
159
160
161 /*
162 * Base sizes of the raw AML resource descriptors, indexed by resource type.
163 * Zero indicates a reserved (and therefore invalid) resource type.
164 */
165 const UINT8 AcpiGbl_ResourceAmlSizes[] =
166 {
167 /* Small descriptors */
168
169 0,
170 0,
171 0,
172 0,
173 ACPI_AML_SIZE_SMALL (AML_RESOURCE_IRQ),
174 ACPI_AML_SIZE_SMALL (AML_RESOURCE_DMA),
175 ACPI_AML_SIZE_SMALL (AML_RESOURCE_START_DEPENDENT),
176 ACPI_AML_SIZE_SMALL (AML_RESOURCE_END_DEPENDENT),
177 ACPI_AML_SIZE_SMALL (AML_RESOURCE_IO),
178 ACPI_AML_SIZE_SMALL (AML_RESOURCE_FIXED_IO),
179 ACPI_AML_SIZE_SMALL (AML_RESOURCE_FIXED_DMA),
180 0,
181 0,
182 0,
183 ACPI_AML_SIZE_SMALL (AML_RESOURCE_VENDOR_SMALL),
184 ACPI_AML_SIZE_SMALL (AML_RESOURCE_END_TAG),
185
186 /* Large descriptors */
187
188 0,
189 ACPI_AML_SIZE_LARGE (AML_RESOURCE_MEMORY24),
190 ACPI_AML_SIZE_LARGE (AML_RESOURCE_GENERIC_REGISTER),
191 0,
192 ACPI_AML_SIZE_LARGE (AML_RESOURCE_VENDOR_LARGE),
193 ACPI_AML_SIZE_LARGE (AML_RESOURCE_MEMORY32),
194 ACPI_AML_SIZE_LARGE (AML_RESOURCE_FIXED_MEMORY32),
195 ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS32),
196 ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS16),
197 ACPI_AML_SIZE_LARGE (AML_RESOURCE_EXTENDED_IRQ),
198 ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS64),
199 ACPI_AML_SIZE_LARGE (AML_RESOURCE_EXTENDED_ADDRESS64),
200 ACPI_AML_SIZE_LARGE (AML_RESOURCE_GPIO),
201 ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_FUNCTION),
202 ACPI_AML_SIZE_LARGE (AML_RESOURCE_COMMON_SERIALBUS),
203 ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_CONFIG),
204 ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_GROUP),
205 ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_GROUP_FUNCTION),
206 ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_GROUP_CONFIG),
207 ACPI_AML_SIZE_LARGE (AML_RESOURCE_CLOCK_INPUT),
208
209 };
210
211 const UINT8 AcpiGbl_ResourceAmlSerialBusSizes[] =
212 {
213 0,
214 ACPI_AML_SIZE_LARGE (AML_RESOURCE_I2C_SERIALBUS),
215 ACPI_AML_SIZE_LARGE (AML_RESOURCE_SPI_SERIALBUS),
216 ACPI_AML_SIZE_LARGE (AML_RESOURCE_UART_SERIALBUS),
217 ACPI_AML_SIZE_LARGE (AML_RESOURCE_CSI2_SERIALBUS),
218 };
219
220
221 /*
222 * Resource types, used to validate the resource length field.
223 * The length of fixed-length types must match exactly, variable
224 * lengths must meet the minimum required length, etc.
225 * Zero indicates a reserved (and therefore invalid) resource type.
226 */
227 static const UINT8 AcpiGbl_ResourceTypes[] =
228 {
229 /* Small descriptors */
230
231 0,
232 0,
233 0,
234 0,
235 ACPI_SMALL_VARIABLE_LENGTH, /* 04 IRQ */
236 ACPI_FIXED_LENGTH, /* 05 DMA */
237 ACPI_SMALL_VARIABLE_LENGTH, /* 06 StartDependentFunctions */
238 ACPI_FIXED_LENGTH, /* 07 EndDependentFunctions */
239 ACPI_FIXED_LENGTH, /* 08 IO */
240 ACPI_FIXED_LENGTH, /* 09 FixedIO */
241 ACPI_FIXED_LENGTH, /* 0A FixedDMA */
242 0,
243 0,
244 0,
245 ACPI_VARIABLE_LENGTH, /* 0E VendorShort */
246 ACPI_FIXED_LENGTH, /* 0F EndTag */
247
248 /* Large descriptors */
249
250 0,
251 ACPI_FIXED_LENGTH, /* 01 Memory24 */
252 ACPI_FIXED_LENGTH, /* 02 GenericRegister */
253 0,
254 ACPI_VARIABLE_LENGTH, /* 04 VendorLong */
255 ACPI_FIXED_LENGTH, /* 05 Memory32 */
256 ACPI_FIXED_LENGTH, /* 06 Memory32Fixed */
257 ACPI_VARIABLE_LENGTH, /* 07 Dword* address */
258 ACPI_VARIABLE_LENGTH, /* 08 Word* address */
259 ACPI_VARIABLE_LENGTH, /* 09 ExtendedIRQ */
260 ACPI_VARIABLE_LENGTH, /* 0A Qword* address */
261 ACPI_FIXED_LENGTH, /* 0B Extended* address */
262 ACPI_VARIABLE_LENGTH, /* 0C Gpio* */
263 ACPI_VARIABLE_LENGTH, /* 0D PinFunction */
264 ACPI_VARIABLE_LENGTH, /* 0E *SerialBus */
265 ACPI_VARIABLE_LENGTH, /* 0F PinConfig */
266 ACPI_VARIABLE_LENGTH, /* 10 PinGroup */
267 ACPI_VARIABLE_LENGTH, /* 11 PinGroupFunction */
268 ACPI_VARIABLE_LENGTH, /* 12 PinGroupConfig */
269 ACPI_VARIABLE_LENGTH, /* 13 ClockInput */
270 };
271
272
273 /*******************************************************************************
274 *
275 * FUNCTION: AcpiUtWalkAmlResources
276 *
277 * PARAMETERS: WalkState - Current walk info
278 * PARAMETERS: Aml - Pointer to the raw AML resource template
279 * AmlLength - Length of the entire template
280 * UserFunction - Called once for each descriptor found. If
281 * NULL, a pointer to the EndTag is returned
282 * Context - Passed to UserFunction
283 *
284 * RETURN: Status
285 *
286 * DESCRIPTION: Walk a raw AML resource list(buffer). User function called
287 * once for each resource found.
288 *
289 ******************************************************************************/
290
291 ACPI_STATUS
AcpiUtWalkAmlResources(ACPI_WALK_STATE * WalkState,UINT8 * Aml,ACPI_SIZE AmlLength,ACPI_WALK_AML_CALLBACK UserFunction,void ** Context)292 AcpiUtWalkAmlResources (
293 ACPI_WALK_STATE *WalkState,
294 UINT8 *Aml,
295 ACPI_SIZE AmlLength,
296 ACPI_WALK_AML_CALLBACK UserFunction,
297 void **Context)
298 {
299 ACPI_STATUS Status;
300 UINT8 *EndAml;
301 UINT8 ResourceIndex;
302 UINT32 Length;
303 UINT32 Offset = 0;
304 UINT8 EndTag[2] = {0x79, 0x00};
305
306
307 ACPI_FUNCTION_TRACE (UtWalkAmlResources);
308
309
310 /* The absolute minimum resource template is one EndTag descriptor */
311
312 if (AmlLength < sizeof (AML_RESOURCE_END_TAG))
313 {
314 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
315 }
316
317 /* Point to the end of the resource template buffer */
318
319 EndAml = Aml + AmlLength;
320
321 /* Walk the byte list, abort on any invalid descriptor type or length */
322
323 while (Aml < EndAml)
324 {
325 /* Validate the Resource Type and Resource Length */
326
327 Status = AcpiUtValidateResource (WalkState, Aml, &ResourceIndex);
328 if (ACPI_FAILURE (Status))
329 {
330 /*
331 * Exit on failure. Cannot continue because the descriptor
332 * length may be bogus also.
333 */
334 return_ACPI_STATUS (Status);
335 }
336
337 /* Get the length of this descriptor */
338
339 Length = AcpiUtGetDescriptorLength (Aml);
340
341 /* Invoke the user function */
342
343 if (UserFunction)
344 {
345 Status = UserFunction (
346 Aml, Length, Offset, ResourceIndex, Context);
347 if (ACPI_FAILURE (Status))
348 {
349 return_ACPI_STATUS (Status);
350 }
351 }
352
353 /* An EndTag descriptor terminates this resource template */
354
355 if (AcpiUtGetResourceType (Aml) == ACPI_RESOURCE_NAME_END_TAG)
356 {
357 /*
358 * There must be at least one more byte in the buffer for
359 * the 2nd byte of the EndTag
360 */
361 if ((Aml + 1) >= EndAml)
362 {
363 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
364 }
365
366 /*
367 * Don't attempt to perform any validation on the 2nd byte.
368 * Although all known ASL compilers insert a zero for the 2nd
369 * byte, it can also be a checksum (as per the ACPI spec),
370 * and this is occasionally seen in the field. July 2017.
371 */
372
373 /* Return the pointer to the EndTag if requested */
374
375 if (!UserFunction)
376 {
377 *Context = Aml;
378 }
379
380 /* Normal exit */
381
382 return_ACPI_STATUS (AE_OK);
383 }
384
385 Aml += Length;
386 Offset += Length;
387 }
388
389 /* Did not find an EndTag descriptor */
390
391 if (UserFunction)
392 {
393 /* Insert an EndTag anyway. AcpiRsGetListLength always leaves room */
394
395 (void) AcpiUtValidateResource (WalkState, EndTag, &ResourceIndex);
396 Status = UserFunction (EndTag, 2, Offset, ResourceIndex, Context);
397 if (ACPI_FAILURE (Status))
398 {
399 return_ACPI_STATUS (Status);
400 }
401 }
402
403 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
404 }
405
406
407 /*******************************************************************************
408 *
409 * FUNCTION: AcpiUtValidateResource
410 *
411 * PARAMETERS: WalkState - Current walk info
412 * Aml - Pointer to the raw AML resource descriptor
413 * ReturnIndex - Where the resource index is returned. NULL
414 * if the index is not required.
415 *
416 * RETURN: Status, and optionally the Index into the global resource tables
417 *
418 * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
419 * Type and Resource Length. Returns an index into the global
420 * resource information/dispatch tables for later use.
421 *
422 ******************************************************************************/
423
424 ACPI_STATUS
AcpiUtValidateResource(ACPI_WALK_STATE * WalkState,void * Aml,UINT8 * ReturnIndex)425 AcpiUtValidateResource (
426 ACPI_WALK_STATE *WalkState,
427 void *Aml,
428 UINT8 *ReturnIndex)
429 {
430 AML_RESOURCE *AmlResource;
431 UINT8 ResourceType;
432 UINT8 ResourceIndex;
433 ACPI_RS_LENGTH ResourceLength;
434 ACPI_RS_LENGTH MinimumResourceLength;
435
436
437 ACPI_FUNCTION_ENTRY ();
438
439
440 /*
441 * 1) Validate the ResourceType field (Byte 0)
442 */
443 ResourceType = ACPI_GET8 (Aml);
444
445 /*
446 * Byte 0 contains the descriptor name (Resource Type)
447 * Examine the large/small bit in the resource header
448 */
449 if (ResourceType & ACPI_RESOURCE_NAME_LARGE)
450 {
451 /* Verify the large resource type (name) against the max */
452
453 if (ResourceType > ACPI_RESOURCE_NAME_LARGE_MAX)
454 {
455 goto InvalidResource;
456 }
457
458 /*
459 * Large Resource Type -- bits 6:0 contain the name
460 * Translate range 0x80-0x8B to index range 0x10-0x1B
461 */
462 ResourceIndex = (UINT8) (ResourceType - 0x70);
463 }
464 else
465 {
466 /*
467 * Small Resource Type -- bits 6:3 contain the name
468 * Shift range to index range 0x00-0x0F
469 */
470 ResourceIndex = (UINT8)
471 ((ResourceType & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
472 }
473
474 /*
475 * Check validity of the resource type, via AcpiGbl_ResourceTypes.
476 * Zero indicates an invalid resource.
477 */
478 if (!AcpiGbl_ResourceTypes[ResourceIndex])
479 {
480 goto InvalidResource;
481 }
482
483 /*
484 * Validate the ResourceLength field. This ensures that the length
485 * is at least reasonable, and guarantees that it is non-zero.
486 */
487 ResourceLength = AcpiUtGetResourceLength (Aml);
488 MinimumResourceLength = AcpiGbl_ResourceAmlSizes[ResourceIndex];
489
490 /* Validate based upon the type of resource - fixed length or variable */
491
492 switch (AcpiGbl_ResourceTypes[ResourceIndex])
493 {
494 case ACPI_FIXED_LENGTH:
495
496 /* Fixed length resource, length must match exactly */
497
498 if (ResourceLength != MinimumResourceLength)
499 {
500 goto BadResourceLength;
501 }
502 break;
503
504 case ACPI_VARIABLE_LENGTH:
505
506 /* Variable length resource, length must be at least the minimum */
507
508 if (ResourceLength < MinimumResourceLength)
509 {
510 goto BadResourceLength;
511 }
512 break;
513
514 case ACPI_SMALL_VARIABLE_LENGTH:
515
516 /* Small variable length resource, length can be (Min) or (Min-1) */
517
518 if ((ResourceLength > MinimumResourceLength) ||
519 (ResourceLength < (MinimumResourceLength - 1)))
520 {
521 goto BadResourceLength;
522 }
523 break;
524
525 default:
526
527 /* Shouldn't happen (because of validation earlier), but be sure */
528
529 goto InvalidResource;
530 }
531
532 AmlResource = ACPI_CAST_PTR (AML_RESOURCE, Aml);
533 if (ResourceType == ACPI_RESOURCE_NAME_SERIAL_BUS)
534 {
535 /* Avoid undefined behavior: member access within misaligned address */
536
537 AML_RESOURCE_COMMON_SERIALBUS CommonSerialBus;
538 memcpy(&CommonSerialBus, AmlResource, sizeof(CommonSerialBus));
539
540 /* Validate the BusType field */
541
542 if ((CommonSerialBus.Type == 0) ||
543 (CommonSerialBus.Type > AML_RESOURCE_MAX_SERIALBUSTYPE))
544 {
545 if (WalkState)
546 {
547 ACPI_ERROR ((AE_INFO,
548 "Invalid/unsupported SerialBus resource descriptor: BusType 0x%2.2X",
549 CommonSerialBus.Type));
550 }
551 return (AE_AML_INVALID_RESOURCE_TYPE);
552 }
553 }
554
555 /* Optionally return the resource table index */
556
557 if (ReturnIndex)
558 {
559 *ReturnIndex = ResourceIndex;
560 }
561
562 return (AE_OK);
563
564
565 InvalidResource:
566
567 if (WalkState)
568 {
569 ACPI_ERROR ((AE_INFO,
570 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
571 ResourceType));
572 }
573 return (AE_AML_INVALID_RESOURCE_TYPE);
574
575 BadResourceLength:
576
577 if (WalkState)
578 {
579 ACPI_ERROR ((AE_INFO,
580 "Invalid resource descriptor length: Type "
581 "0x%2.2X, Length 0x%4.4X, MinLength 0x%4.4X",
582 ResourceType, ResourceLength, MinimumResourceLength));
583 }
584 return (AE_AML_BAD_RESOURCE_LENGTH);
585 }
586
587
588 /*******************************************************************************
589 *
590 * FUNCTION: AcpiUtGetResourceType
591 *
592 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
593 *
594 * RETURN: The Resource Type with no extraneous bits (except the
595 * Large/Small descriptor bit -- this is left alone)
596 *
597 * DESCRIPTION: Extract the Resource Type/Name from the first byte of
598 * a resource descriptor.
599 *
600 ******************************************************************************/
601
602 UINT8
AcpiUtGetResourceType(void * Aml)603 AcpiUtGetResourceType (
604 void *Aml)
605 {
606 ACPI_FUNCTION_ENTRY ();
607
608
609 /*
610 * Byte 0 contains the descriptor name (Resource Type)
611 * Examine the large/small bit in the resource header
612 */
613 if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
614 {
615 /* Large Resource Type -- bits 6:0 contain the name */
616
617 return (ACPI_GET8 (Aml));
618 }
619 else
620 {
621 /* Small Resource Type -- bits 6:3 contain the name */
622
623 return ((UINT8) (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
624 }
625 }
626
627
628 /*******************************************************************************
629 *
630 * FUNCTION: AcpiUtGetResourceLength
631 *
632 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
633 *
634 * RETURN: Byte Length
635 *
636 * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
637 * definition, this does not include the size of the descriptor
638 * header or the length field itself.
639 *
640 ******************************************************************************/
641
642 UINT16
AcpiUtGetResourceLength(void * Aml)643 AcpiUtGetResourceLength (
644 void *Aml)
645 {
646 ACPI_RS_LENGTH ResourceLength;
647
648
649 ACPI_FUNCTION_ENTRY ();
650
651
652 /*
653 * Byte 0 contains the descriptor name (Resource Type)
654 * Examine the large/small bit in the resource header
655 */
656 if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
657 {
658 /* Large Resource type -- bytes 1-2 contain the 16-bit length */
659
660 ACPI_MOVE_16_TO_16 (&ResourceLength, ACPI_ADD_PTR (UINT8, Aml, 1));
661
662 }
663 else
664 {
665 /* Small Resource type -- bits 2:0 of byte 0 contain the length */
666
667 ResourceLength = (UINT16) (ACPI_GET8 (Aml) &
668 ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
669 }
670
671 return (ResourceLength);
672 }
673
674
675 /*******************************************************************************
676 *
677 * FUNCTION: AcpiUtGetResourceHeaderLength
678 *
679 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
680 *
681 * RETURN: Length of the AML header (depends on large/small descriptor)
682 *
683 * DESCRIPTION: Get the length of the header for this resource.
684 *
685 ******************************************************************************/
686
687 UINT8
AcpiUtGetResourceHeaderLength(void * Aml)688 AcpiUtGetResourceHeaderLength (
689 void *Aml)
690 {
691 ACPI_FUNCTION_ENTRY ();
692
693
694 /* Examine the large/small bit in the resource header */
695
696 if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
697 {
698 return (sizeof (AML_RESOURCE_LARGE_HEADER));
699 }
700 else
701 {
702 return (sizeof (AML_RESOURCE_SMALL_HEADER));
703 }
704 }
705
706
707 /*******************************************************************************
708 *
709 * FUNCTION: AcpiUtGetDescriptorLength
710 *
711 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
712 *
713 * RETURN: Byte length
714 *
715 * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
716 * length of the descriptor header and the length field itself.
717 * Used to walk descriptor lists.
718 *
719 ******************************************************************************/
720
721 UINT32
AcpiUtGetDescriptorLength(void * Aml)722 AcpiUtGetDescriptorLength (
723 void *Aml)
724 {
725 ACPI_FUNCTION_ENTRY ();
726
727
728 /*
729 * Get the Resource Length (does not include header length) and add
730 * the header length (depends on if this is a small or large resource)
731 */
732 return (AcpiUtGetResourceLength (Aml) +
733 AcpiUtGetResourceHeaderLength (Aml));
734 }
735
736
737 /*******************************************************************************
738 *
739 * FUNCTION: AcpiUtGetResourceEndTag
740 *
741 * PARAMETERS: ObjDesc - The resource template buffer object
742 * EndTag - Where the pointer to the EndTag is returned
743 *
744 * RETURN: Status, pointer to the end tag
745 *
746 * DESCRIPTION: Find the EndTag resource descriptor in an AML resource template
747 * Note: allows a buffer length of zero.
748 *
749 ******************************************************************************/
750
751 ACPI_STATUS
AcpiUtGetResourceEndTag(ACPI_OPERAND_OBJECT * ObjDesc,UINT8 ** EndTag)752 AcpiUtGetResourceEndTag (
753 ACPI_OPERAND_OBJECT *ObjDesc,
754 UINT8 **EndTag)
755 {
756 ACPI_STATUS Status;
757
758
759 ACPI_FUNCTION_TRACE (UtGetResourceEndTag);
760
761
762 /* Allow a buffer length of zero */
763
764 if (!ObjDesc->Buffer.Length)
765 {
766 *EndTag = ObjDesc->Buffer.Pointer;
767 return_ACPI_STATUS (AE_OK);
768 }
769
770 /* Validate the template and get a pointer to the EndTag */
771
772 Status = AcpiUtWalkAmlResources (NULL, ObjDesc->Buffer.Pointer,
773 ObjDesc->Buffer.Length, NULL, (void **) EndTag);
774
775 return_ACPI_STATUS (Status);
776 }
777
