1 /*******************************************************************************
2 *
3 * Module Name: utresrc - Resource management utilities
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2012, 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/acpi.h>
45 #include "accommon.h"
46 #include "acresrc.h"
47
48 #define _COMPONENT ACPI_UTILITIES
49 ACPI_MODULE_NAME("utresrc")
50 #if defined(ACPI_DISASSEMBLER) || defined (ACPI_DEBUGGER)
51 /*
52 * Strings used to decode resource descriptors.
53 * Used by both the disassembler and the debugger resource dump routines
54 */
55 const char *acpi_gbl_bm_decode[] = {
56 "NotBusMaster",
57 "BusMaster"
58 };
59
60 const char *acpi_gbl_config_decode[] = {
61 "0 - Good Configuration",
62 "1 - Acceptable Configuration",
63 "2 - Suboptimal Configuration",
64 "3 - ***Invalid Configuration***",
65 };
66
67 const char *acpi_gbl_consume_decode[] = {
68 "ResourceProducer",
69 "ResourceConsumer"
70 };
71
72 const char *acpi_gbl_dec_decode[] = {
73 "PosDecode",
74 "SubDecode"
75 };
76
77 const char *acpi_gbl_he_decode[] = {
78 "Level",
79 "Edge"
80 };
81
82 const char *acpi_gbl_io_decode[] = {
83 "Decode10",
84 "Decode16"
85 };
86
87 const char *acpi_gbl_ll_decode[] = {
88 "ActiveHigh",
89 "ActiveLow"
90 };
91
92 const char *acpi_gbl_max_decode[] = {
93 "MaxNotFixed",
94 "MaxFixed"
95 };
96
97 const char *acpi_gbl_mem_decode[] = {
98 "NonCacheable",
99 "Cacheable",
100 "WriteCombining",
101 "Prefetchable"
102 };
103
104 const char *acpi_gbl_min_decode[] = {
105 "MinNotFixed",
106 "MinFixed"
107 };
108
109 const char *acpi_gbl_mtp_decode[] = {
110 "AddressRangeMemory",
111 "AddressRangeReserved",
112 "AddressRangeACPI",
113 "AddressRangeNVS"
114 };
115
116 const char *acpi_gbl_rng_decode[] = {
117 "InvalidRanges",
118 "NonISAOnlyRanges",
119 "ISAOnlyRanges",
120 "EntireRange"
121 };
122
123 const char *acpi_gbl_rw_decode[] = {
124 "ReadOnly",
125 "ReadWrite"
126 };
127
128 const char *acpi_gbl_shr_decode[] = {
129 "Exclusive",
130 "Shared"
131 };
132
133 const char *acpi_gbl_siz_decode[] = {
134 "Transfer8",
135 "Transfer8_16",
136 "Transfer16",
137 "InvalidSize"
138 };
139
140 const char *acpi_gbl_trs_decode[] = {
141 "DenseTranslation",
142 "SparseTranslation"
143 };
144
145 const char *acpi_gbl_ttp_decode[] = {
146 "TypeStatic",
147 "TypeTranslation"
148 };
149
150 const char *acpi_gbl_typ_decode[] = {
151 "Compatibility",
152 "TypeA",
153 "TypeB",
154 "TypeF"
155 };
156
157 const char *acpi_gbl_ppc_decode[] = {
158 "PullDefault",
159 "PullUp",
160 "PullDown",
161 "PullNone"
162 };
163
164 const char *acpi_gbl_ior_decode[] = {
165 "IoRestrictionNone",
166 "IoRestrictionInputOnly",
167 "IoRestrictionOutputOnly",
168 "IoRestrictionNoneAndPreserve"
169 };
170
171 const char *acpi_gbl_dts_decode[] = {
172 "Width8bit",
173 "Width16bit",
174 "Width32bit",
175 "Width64bit",
176 "Width128bit",
177 "Width256bit",
178 };
179
180 /* GPIO connection type */
181
182 const char *acpi_gbl_ct_decode[] = {
183 "Interrupt",
184 "I/O"
185 };
186
187 /* Serial bus type */
188
189 const char *acpi_gbl_sbt_decode[] = {
190 "/* UNKNOWN serial bus type */",
191 "I2C",
192 "SPI",
193 "UART"
194 };
195
196 /* I2C serial bus access mode */
197
198 const char *acpi_gbl_am_decode[] = {
199 "AddressingMode7Bit",
200 "AddressingMode10Bit"
201 };
202
203 /* I2C serial bus slave mode */
204
205 const char *acpi_gbl_sm_decode[] = {
206 "ControllerInitiated",
207 "DeviceInitiated"
208 };
209
210 /* SPI serial bus wire mode */
211
212 const char *acpi_gbl_wm_decode[] = {
213 "FourWireMode",
214 "ThreeWireMode"
215 };
216
217 /* SPI serial clock phase */
218
219 const char *acpi_gbl_cph_decode[] = {
220 "ClockPhaseFirst",
221 "ClockPhaseSecond"
222 };
223
224 /* SPI serial bus clock polarity */
225
226 const char *acpi_gbl_cpo_decode[] = {
227 "ClockPolarityLow",
228 "ClockPolarityHigh"
229 };
230
231 /* SPI serial bus device polarity */
232
233 const char *acpi_gbl_dp_decode[] = {
234 "PolarityLow",
235 "PolarityHigh"
236 };
237
238 /* UART serial bus endian */
239
240 const char *acpi_gbl_ed_decode[] = {
241 "LittleEndian",
242 "BigEndian"
243 };
244
245 /* UART serial bus bits per byte */
246
247 const char *acpi_gbl_bpb_decode[] = {
248 "DataBitsFive",
249 "DataBitsSix",
250 "DataBitsSeven",
251 "DataBitsEight",
252 "DataBitsNine",
253 "/* UNKNOWN Bits per byte */",
254 "/* UNKNOWN Bits per byte */",
255 "/* UNKNOWN Bits per byte */"
256 };
257
258 /* UART serial bus stop bits */
259
260 const char *acpi_gbl_sb_decode[] = {
261 "StopBitsNone",
262 "StopBitsOne",
263 "StopBitsOnePlusHalf",
264 "StopBitsTwo"
265 };
266
267 /* UART serial bus flow control */
268
269 const char *acpi_gbl_fc_decode[] = {
270 "FlowControlNone",
271 "FlowControlHardware",
272 "FlowControlXON",
273 "/* UNKNOWN flow control keyword */"
274 };
275
276 /* UART serial bus parity type */
277
278 const char *acpi_gbl_pt_decode[] = {
279 "ParityTypeNone",
280 "ParityTypeEven",
281 "ParityTypeOdd",
282 "ParityTypeMark",
283 "ParityTypeSpace",
284 "/* UNKNOWN parity keyword */",
285 "/* UNKNOWN parity keyword */",
286 "/* UNKNOWN parity keyword */"
287 };
288
289 #endif
290
291 /*
292 * Base sizes of the raw AML resource descriptors, indexed by resource type.
293 * Zero indicates a reserved (and therefore invalid) resource type.
294 */
295 const u8 acpi_gbl_resource_aml_sizes[] = {
296 /* Small descriptors */
297
298 0,
299 0,
300 0,
301 0,
302 ACPI_AML_SIZE_SMALL(struct aml_resource_irq),
303 ACPI_AML_SIZE_SMALL(struct aml_resource_dma),
304 ACPI_AML_SIZE_SMALL(struct aml_resource_start_dependent),
305 ACPI_AML_SIZE_SMALL(struct aml_resource_end_dependent),
306 ACPI_AML_SIZE_SMALL(struct aml_resource_io),
307 ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_io),
308 ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_dma),
309 0,
310 0,
311 0,
312 ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small),
313 ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag),
314
315 /* Large descriptors */
316
317 0,
318 ACPI_AML_SIZE_LARGE(struct aml_resource_memory24),
319 ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register),
320 0,
321 ACPI_AML_SIZE_LARGE(struct aml_resource_vendor_large),
322 ACPI_AML_SIZE_LARGE(struct aml_resource_memory32),
323 ACPI_AML_SIZE_LARGE(struct aml_resource_fixed_memory32),
324 ACPI_AML_SIZE_LARGE(struct aml_resource_address32),
325 ACPI_AML_SIZE_LARGE(struct aml_resource_address16),
326 ACPI_AML_SIZE_LARGE(struct aml_resource_extended_irq),
327 ACPI_AML_SIZE_LARGE(struct aml_resource_address64),
328 ACPI_AML_SIZE_LARGE(struct aml_resource_extended_address64),
329 ACPI_AML_SIZE_LARGE(struct aml_resource_gpio),
330 0,
331 ACPI_AML_SIZE_LARGE(struct aml_resource_common_serialbus),
332 };
333
334 const u8 acpi_gbl_resource_aml_serial_bus_sizes[] = {
335 0,
336 ACPI_AML_SIZE_LARGE(struct aml_resource_i2c_serialbus),
337 ACPI_AML_SIZE_LARGE(struct aml_resource_spi_serialbus),
338 ACPI_AML_SIZE_LARGE(struct aml_resource_uart_serialbus),
339 };
340
341 /*
342 * Resource types, used to validate the resource length field.
343 * The length of fixed-length types must match exactly, variable
344 * lengths must meet the minimum required length, etc.
345 * Zero indicates a reserved (and therefore invalid) resource type.
346 */
347 static const u8 acpi_gbl_resource_types[] = {
348 /* Small descriptors */
349
350 0,
351 0,
352 0,
353 0,
354 ACPI_SMALL_VARIABLE_LENGTH, /* 04 IRQ */
355 ACPI_FIXED_LENGTH, /* 05 DMA */
356 ACPI_SMALL_VARIABLE_LENGTH, /* 06 start_dependent_functions */
357 ACPI_FIXED_LENGTH, /* 07 end_dependent_functions */
358 ACPI_FIXED_LENGTH, /* 08 IO */
359 ACPI_FIXED_LENGTH, /* 09 fixed_iO */
360 ACPI_FIXED_LENGTH, /* 0_a fixed_dMA */
361 0,
362 0,
363 0,
364 ACPI_VARIABLE_LENGTH, /* 0_e vendor_short */
365 ACPI_FIXED_LENGTH, /* 0_f end_tag */
366
367 /* Large descriptors */
368
369 0,
370 ACPI_FIXED_LENGTH, /* 01 Memory24 */
371 ACPI_FIXED_LENGTH, /* 02 generic_register */
372 0,
373 ACPI_VARIABLE_LENGTH, /* 04 vendor_long */
374 ACPI_FIXED_LENGTH, /* 05 Memory32 */
375 ACPI_FIXED_LENGTH, /* 06 memory32_fixed */
376 ACPI_VARIABLE_LENGTH, /* 07 Dword* address */
377 ACPI_VARIABLE_LENGTH, /* 08 Word* address */
378 ACPI_VARIABLE_LENGTH, /* 09 extended_iRQ */
379 ACPI_VARIABLE_LENGTH, /* 0_a Qword* address */
380 ACPI_FIXED_LENGTH, /* 0_b Extended* address */
381 ACPI_VARIABLE_LENGTH, /* 0_c Gpio* */
382 0,
383 ACPI_VARIABLE_LENGTH /* 0_e *serial_bus */
384 };
385
386 /*
387 * For the i_aSL compiler/disassembler, we don't want any error messages
388 * because the disassembler uses the resource validation code to determine
389 * if Buffer objects are actually Resource Templates.
390 */
391 #ifdef ACPI_ASL_COMPILER
392 #define ACPI_RESOURCE_ERROR(plist)
393 #else
394 #define ACPI_RESOURCE_ERROR(plist) ACPI_ERROR(plist)
395 #endif
396
397 /*******************************************************************************
398 *
399 * FUNCTION: acpi_ut_walk_aml_resources
400 *
401 * PARAMETERS: Aml - Pointer to the raw AML resource template
402 * aml_length - Length of the entire template
403 * user_function - Called once for each descriptor found. If
404 * NULL, a pointer to the end_tag is returned
405 * Context - Passed to user_function
406 *
407 * RETURN: Status
408 *
409 * DESCRIPTION: Walk a raw AML resource list(buffer). User function called
410 * once for each resource found.
411 *
412 ******************************************************************************/
413
414 acpi_status
acpi_ut_walk_aml_resources(u8 * aml,acpi_size aml_length,acpi_walk_aml_callback user_function,void ** context)415 acpi_ut_walk_aml_resources(u8 * aml,
416 acpi_size aml_length,
417 acpi_walk_aml_callback user_function, void **context)
418 {
419 acpi_status status;
420 u8 *end_aml;
421 u8 resource_index;
422 u32 length;
423 u32 offset = 0;
424 u8 end_tag[2] = { 0x79, 0x00 };
425
426 ACPI_FUNCTION_TRACE(ut_walk_aml_resources);
427
428 /* The absolute minimum resource template is one end_tag descriptor */
429
430 if (aml_length < sizeof(struct aml_resource_end_tag)) {
431 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
432 }
433
434 /* Point to the end of the resource template buffer */
435
436 end_aml = aml + aml_length;
437
438 /* Walk the byte list, abort on any invalid descriptor type or length */
439
440 while (aml < end_aml) {
441
442 /* Validate the Resource Type and Resource Length */
443
444 status = acpi_ut_validate_resource(aml, &resource_index);
445 if (ACPI_FAILURE(status)) {
446 /*
447 * Exit on failure. Cannot continue because the descriptor length
448 * may be bogus also.
449 */
450 return_ACPI_STATUS(status);
451 }
452
453 /* Get the length of this descriptor */
454
455 length = acpi_ut_get_descriptor_length(aml);
456
457 /* Invoke the user function */
458
459 if (user_function) {
460 status =
461 user_function(aml, length, offset, resource_index,
462 context);
463 if (ACPI_FAILURE(status)) {
464 return_ACPI_STATUS(status);
465 }
466 }
467
468 /* An end_tag descriptor terminates this resource template */
469
470 if (acpi_ut_get_resource_type(aml) ==
471 ACPI_RESOURCE_NAME_END_TAG) {
472 /*
473 * There must be at least one more byte in the buffer for
474 * the 2nd byte of the end_tag
475 */
476 if ((aml + 1) >= end_aml) {
477 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
478 }
479
480 /* Return the pointer to the end_tag if requested */
481
482 if (!user_function) {
483 *context = aml;
484 }
485
486 /* Normal exit */
487
488 return_ACPI_STATUS(AE_OK);
489 }
490
491 aml += length;
492 offset += length;
493 }
494
495 /* Did not find an end_tag descriptor */
496
497 if (user_function) {
498
499 /* Insert an end_tag anyway. acpi_rs_get_list_length always leaves room */
500
501 (void)acpi_ut_validate_resource(end_tag, &resource_index);
502 status =
503 user_function(end_tag, 2, offset, resource_index, context);
504 if (ACPI_FAILURE(status)) {
505 return_ACPI_STATUS(status);
506 }
507 }
508
509 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
510 }
511
512 /*******************************************************************************
513 *
514 * FUNCTION: acpi_ut_validate_resource
515 *
516 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
517 * return_index - Where the resource index is returned. NULL
518 * if the index is not required.
519 *
520 * RETURN: Status, and optionally the Index into the global resource tables
521 *
522 * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
523 * Type and Resource Length. Returns an index into the global
524 * resource information/dispatch tables for later use.
525 *
526 ******************************************************************************/
527
acpi_ut_validate_resource(void * aml,u8 * return_index)528 acpi_status acpi_ut_validate_resource(void *aml, u8 * return_index)
529 {
530 union aml_resource *aml_resource;
531 u8 resource_type;
532 u8 resource_index;
533 acpi_rs_length resource_length;
534 acpi_rs_length minimum_resource_length;
535
536 ACPI_FUNCTION_ENTRY();
537
538 /*
539 * 1) Validate the resource_type field (Byte 0)
540 */
541 resource_type = ACPI_GET8(aml);
542
543 /*
544 * Byte 0 contains the descriptor name (Resource Type)
545 * Examine the large/small bit in the resource header
546 */
547 if (resource_type & ACPI_RESOURCE_NAME_LARGE) {
548
549 /* Verify the large resource type (name) against the max */
550
551 if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) {
552 goto invalid_resource;
553 }
554
555 /*
556 * Large Resource Type -- bits 6:0 contain the name
557 * Translate range 0x80-0x8B to index range 0x10-0x1B
558 */
559 resource_index = (u8) (resource_type - 0x70);
560 } else {
561 /*
562 * Small Resource Type -- bits 6:3 contain the name
563 * Shift range to index range 0x00-0x0F
564 */
565 resource_index = (u8)
566 ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
567 }
568
569 /*
570 * Check validity of the resource type, via acpi_gbl_resource_types. Zero
571 * indicates an invalid resource.
572 */
573 if (!acpi_gbl_resource_types[resource_index]) {
574 goto invalid_resource;
575 }
576
577 /*
578 * Validate the resource_length field. This ensures that the length
579 * is at least reasonable, and guarantees that it is non-zero.
580 */
581 resource_length = acpi_ut_get_resource_length(aml);
582 minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index];
583
584 /* Validate based upon the type of resource - fixed length or variable */
585
586 switch (acpi_gbl_resource_types[resource_index]) {
587 case ACPI_FIXED_LENGTH:
588
589 /* Fixed length resource, length must match exactly */
590
591 if (resource_length != minimum_resource_length) {
592 goto bad_resource_length;
593 }
594 break;
595
596 case ACPI_VARIABLE_LENGTH:
597
598 /* Variable length resource, length must be at least the minimum */
599
600 if (resource_length < minimum_resource_length) {
601 goto bad_resource_length;
602 }
603 break;
604
605 case ACPI_SMALL_VARIABLE_LENGTH:
606
607 /* Small variable length resource, length can be (Min) or (Min-1) */
608
609 if ((resource_length > minimum_resource_length) ||
610 (resource_length < (minimum_resource_length - 1))) {
611 goto bad_resource_length;
612 }
613 break;
614
615 default:
616
617 /* Shouldn't happen (because of validation earlier), but be sure */
618
619 goto invalid_resource;
620 }
621
622 aml_resource = ACPI_CAST_PTR(union aml_resource, aml);
623 if (resource_type == ACPI_RESOURCE_NAME_SERIAL_BUS) {
624
625 /* Validate the bus_type field */
626
627 if ((aml_resource->common_serial_bus.type == 0) ||
628 (aml_resource->common_serial_bus.type >
629 AML_RESOURCE_MAX_SERIALBUSTYPE)) {
630 ACPI_RESOURCE_ERROR((AE_INFO,
631 "Invalid/unsupported SerialBus resource descriptor: BusType 0x%2.2X",
632 aml_resource->common_serial_bus.
633 type));
634 return (AE_AML_INVALID_RESOURCE_TYPE);
635 }
636 }
637
638 /* Optionally return the resource table index */
639
640 if (return_index) {
641 *return_index = resource_index;
642 }
643
644 return (AE_OK);
645
646 invalid_resource:
647
648 ACPI_RESOURCE_ERROR((AE_INFO,
649 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
650 resource_type));
651 return (AE_AML_INVALID_RESOURCE_TYPE);
652
653 bad_resource_length:
654
655 ACPI_RESOURCE_ERROR((AE_INFO,
656 "Invalid resource descriptor length: Type "
657 "0x%2.2X, Length 0x%4.4X, MinLength 0x%4.4X",
658 resource_type, resource_length,
659 minimum_resource_length));
660 return (AE_AML_BAD_RESOURCE_LENGTH);
661 }
662
663 /*******************************************************************************
664 *
665 * FUNCTION: acpi_ut_get_resource_type
666 *
667 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
668 *
669 * RETURN: The Resource Type with no extraneous bits (except the
670 * Large/Small descriptor bit -- this is left alone)
671 *
672 * DESCRIPTION: Extract the Resource Type/Name from the first byte of
673 * a resource descriptor.
674 *
675 ******************************************************************************/
676
acpi_ut_get_resource_type(void * aml)677 u8 acpi_ut_get_resource_type(void *aml)
678 {
679 ACPI_FUNCTION_ENTRY();
680
681 /*
682 * Byte 0 contains the descriptor name (Resource Type)
683 * Examine the large/small bit in the resource header
684 */
685 if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
686
687 /* Large Resource Type -- bits 6:0 contain the name */
688
689 return (ACPI_GET8(aml));
690 } else {
691 /* Small Resource Type -- bits 6:3 contain the name */
692
693 return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
694 }
695 }
696
697 /*******************************************************************************
698 *
699 * FUNCTION: acpi_ut_get_resource_length
700 *
701 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
702 *
703 * RETURN: Byte Length
704 *
705 * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
706 * definition, this does not include the size of the descriptor
707 * header or the length field itself.
708 *
709 ******************************************************************************/
710
acpi_ut_get_resource_length(void * aml)711 u16 acpi_ut_get_resource_length(void *aml)
712 {
713 acpi_rs_length resource_length;
714
715 ACPI_FUNCTION_ENTRY();
716
717 /*
718 * Byte 0 contains the descriptor name (Resource Type)
719 * Examine the large/small bit in the resource header
720 */
721 if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
722
723 /* Large Resource type -- bytes 1-2 contain the 16-bit length */
724
725 ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1));
726
727 } else {
728 /* Small Resource type -- bits 2:0 of byte 0 contain the length */
729
730 resource_length = (u16) (ACPI_GET8(aml) &
731 ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
732 }
733
734 return (resource_length);
735 }
736
737 /*******************************************************************************
738 *
739 * FUNCTION: acpi_ut_get_resource_header_length
740 *
741 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
742 *
743 * RETURN: Length of the AML header (depends on large/small descriptor)
744 *
745 * DESCRIPTION: Get the length of the header for this resource.
746 *
747 ******************************************************************************/
748
acpi_ut_get_resource_header_length(void * aml)749 u8 acpi_ut_get_resource_header_length(void *aml)
750 {
751 ACPI_FUNCTION_ENTRY();
752
753 /* Examine the large/small bit in the resource header */
754
755 if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
756 return (sizeof(struct aml_resource_large_header));
757 } else {
758 return (sizeof(struct aml_resource_small_header));
759 }
760 }
761
762 /*******************************************************************************
763 *
764 * FUNCTION: acpi_ut_get_descriptor_length
765 *
766 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
767 *
768 * RETURN: Byte length
769 *
770 * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
771 * length of the descriptor header and the length field itself.
772 * Used to walk descriptor lists.
773 *
774 ******************************************************************************/
775
acpi_ut_get_descriptor_length(void * aml)776 u32 acpi_ut_get_descriptor_length(void *aml)
777 {
778 ACPI_FUNCTION_ENTRY();
779
780 /*
781 * Get the Resource Length (does not include header length) and add
782 * the header length (depends on if this is a small or large resource)
783 */
784 return (acpi_ut_get_resource_length(aml) +
785 acpi_ut_get_resource_header_length(aml));
786 }
787
788 /*******************************************************************************
789 *
790 * FUNCTION: acpi_ut_get_resource_end_tag
791 *
792 * PARAMETERS: obj_desc - The resource template buffer object
793 * end_tag - Where the pointer to the end_tag is returned
794 *
795 * RETURN: Status, pointer to the end tag
796 *
797 * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template
798 * Note: allows a buffer length of zero.
799 *
800 ******************************************************************************/
801
802 acpi_status
acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc,u8 ** end_tag)803 acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc,
804 u8 ** end_tag)
805 {
806 acpi_status status;
807
808 ACPI_FUNCTION_TRACE(ut_get_resource_end_tag);
809
810 /* Allow a buffer length of zero */
811
812 if (!obj_desc->buffer.length) {
813 *end_tag = obj_desc->buffer.pointer;
814 return_ACPI_STATUS(AE_OK);
815 }
816
817 /* Validate the template and get a pointer to the end_tag */
818
819 status = acpi_ut_walk_aml_resources(obj_desc->buffer.pointer,
820 obj_desc->buffer.length, NULL,
821 (void **)end_tag);
822
823 return_ACPI_STATUS(status);
824 }
825