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/acpi.h>
45 #include "accommon.h"
46 #include "acresrc.h"
47
48 #define _COMPONENT ACPI_UTILITIES
49 ACPI_MODULE_NAME("utresrc")
50
51 #if defined(ACPI_DEBUG_OUTPUT) || defined (ACPI_DISASSEMBLER) || defined (ACPI_DEBUGGER)
52 /*
53 * Strings used to decode resource descriptors.
54 * Used by both the disassembler and the debugger resource dump routines
55 */
56 const char *acpi_gbl_bm_decode[] = {
57 "NotBusMaster",
58 "BusMaster"
59 };
60
61 const char *acpi_gbl_config_decode[] = {
62 "0 - Good Configuration",
63 "1 - Acceptable Configuration",
64 "2 - Suboptimal Configuration",
65 "3 - ***Invalid Configuration***",
66 };
67
68 const char *acpi_gbl_consume_decode[] = {
69 "ResourceProducer",
70 "ResourceConsumer"
71 };
72
73 const char *acpi_gbl_dec_decode[] = {
74 "PosDecode",
75 "SubDecode"
76 };
77
78 const char *acpi_gbl_he_decode[] = {
79 "Level",
80 "Edge"
81 };
82
83 const char *acpi_gbl_io_decode[] = {
84 "Decode10",
85 "Decode16"
86 };
87
88 const char *acpi_gbl_ll_decode[] = {
89 "ActiveHigh",
90 "ActiveLow",
91 "ActiveBoth",
92 "Reserved"
93 };
94
95 const char *acpi_gbl_max_decode[] = {
96 "MaxNotFixed",
97 "MaxFixed"
98 };
99
100 const char *acpi_gbl_mem_decode[] = {
101 "NonCacheable",
102 "Cacheable",
103 "WriteCombining",
104 "Prefetchable"
105 };
106
107 const char *acpi_gbl_min_decode[] = {
108 "MinNotFixed",
109 "MinFixed"
110 };
111
112 const char *acpi_gbl_mtp_decode[] = {
113 "AddressRangeMemory",
114 "AddressRangeReserved",
115 "AddressRangeACPI",
116 "AddressRangeNVS"
117 };
118
119 const char *acpi_gbl_rng_decode[] = {
120 "InvalidRanges",
121 "NonISAOnlyRanges",
122 "ISAOnlyRanges",
123 "EntireRange"
124 };
125
126 const char *acpi_gbl_rw_decode[] = {
127 "ReadOnly",
128 "ReadWrite"
129 };
130
131 const char *acpi_gbl_shr_decode[] = {
132 "Exclusive",
133 "Shared",
134 "ExclusiveAndWake", /* ACPI 5.0 */
135 "SharedAndWake" /* ACPI 5.0 */
136 };
137
138 const char *acpi_gbl_siz_decode[] = {
139 "Transfer8",
140 "Transfer8_16",
141 "Transfer16",
142 "InvalidSize"
143 };
144
145 const char *acpi_gbl_trs_decode[] = {
146 "DenseTranslation",
147 "SparseTranslation"
148 };
149
150 const char *acpi_gbl_ttp_decode[] = {
151 "TypeStatic",
152 "TypeTranslation"
153 };
154
155 const char *acpi_gbl_typ_decode[] = {
156 "Compatibility",
157 "TypeA",
158 "TypeB",
159 "TypeF"
160 };
161
162 const char *acpi_gbl_ppc_decode[] = {
163 "PullDefault",
164 "PullUp",
165 "PullDown",
166 "PullNone"
167 };
168
169 const char *acpi_gbl_ior_decode[] = {
170 "IoRestrictionNone",
171 "IoRestrictionInputOnly",
172 "IoRestrictionOutputOnly",
173 "IoRestrictionNoneAndPreserve"
174 };
175
176 const char *acpi_gbl_dts_decode[] = {
177 "Width8bit",
178 "Width16bit",
179 "Width32bit",
180 "Width64bit",
181 "Width128bit",
182 "Width256bit",
183 };
184
185 /* GPIO connection type */
186
187 const char *acpi_gbl_ct_decode[] = {
188 "Interrupt",
189 "I/O"
190 };
191
192 /* Serial bus type */
193
194 const char *acpi_gbl_sbt_decode[] = {
195 "/* UNKNOWN serial bus type */",
196 "I2C",
197 "SPI",
198 "UART"
199 };
200
201 /* I2C serial bus access mode */
202
203 const char *acpi_gbl_am_decode[] = {
204 "AddressingMode7Bit",
205 "AddressingMode10Bit"
206 };
207
208 /* I2C serial bus slave mode */
209
210 const char *acpi_gbl_sm_decode[] = {
211 "ControllerInitiated",
212 "DeviceInitiated"
213 };
214
215 /* SPI serial bus wire mode */
216
217 const char *acpi_gbl_wm_decode[] = {
218 "FourWireMode",
219 "ThreeWireMode"
220 };
221
222 /* SPI serial clock phase */
223
224 const char *acpi_gbl_cph_decode[] = {
225 "ClockPhaseFirst",
226 "ClockPhaseSecond"
227 };
228
229 /* SPI serial bus clock polarity */
230
231 const char *acpi_gbl_cpo_decode[] = {
232 "ClockPolarityLow",
233 "ClockPolarityHigh"
234 };
235
236 /* SPI serial bus device polarity */
237
238 const char *acpi_gbl_dp_decode[] = {
239 "PolarityLow",
240 "PolarityHigh"
241 };
242
243 /* UART serial bus endian */
244
245 const char *acpi_gbl_ed_decode[] = {
246 "LittleEndian",
247 "BigEndian"
248 };
249
250 /* UART serial bus bits per byte */
251
252 const char *acpi_gbl_bpb_decode[] = {
253 "DataBitsFive",
254 "DataBitsSix",
255 "DataBitsSeven",
256 "DataBitsEight",
257 "DataBitsNine",
258 "/* UNKNOWN Bits per byte */",
259 "/* UNKNOWN Bits per byte */",
260 "/* UNKNOWN Bits per byte */"
261 };
262
263 /* UART serial bus stop bits */
264
265 const char *acpi_gbl_sb_decode[] = {
266 "StopBitsZero",
267 "StopBitsOne",
268 "StopBitsOnePlusHalf",
269 "StopBitsTwo"
270 };
271
272 /* UART serial bus flow control */
273
274 const char *acpi_gbl_fc_decode[] = {
275 "FlowControlNone",
276 "FlowControlHardware",
277 "FlowControlXON",
278 "/* UNKNOWN flow control keyword */"
279 };
280
281 /* UART serial bus parity type */
282
283 const char *acpi_gbl_pt_decode[] = {
284 "ParityTypeNone",
285 "ParityTypeEven",
286 "ParityTypeOdd",
287 "ParityTypeMark",
288 "ParityTypeSpace",
289 "/* UNKNOWN parity keyword */",
290 "/* UNKNOWN parity keyword */",
291 "/* UNKNOWN parity keyword */"
292 };
293
294 #endif
295
296 /*
297 * Base sizes of the raw AML resource descriptors, indexed by resource type.
298 * Zero indicates a reserved (and therefore invalid) resource type.
299 */
300 const u8 acpi_gbl_resource_aml_sizes[] = {
301 /* Small descriptors */
302
303 0,
304 0,
305 0,
306 0,
307 ACPI_AML_SIZE_SMALL(struct aml_resource_irq),
308 ACPI_AML_SIZE_SMALL(struct aml_resource_dma),
309 ACPI_AML_SIZE_SMALL(struct aml_resource_start_dependent),
310 ACPI_AML_SIZE_SMALL(struct aml_resource_end_dependent),
311 ACPI_AML_SIZE_SMALL(struct aml_resource_io),
312 ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_io),
313 ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_dma),
314 0,
315 0,
316 0,
317 ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small),
318 ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag),
319
320 /* Large descriptors */
321
322 0,
323 ACPI_AML_SIZE_LARGE(struct aml_resource_memory24),
324 ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register),
325 0,
326 ACPI_AML_SIZE_LARGE(struct aml_resource_vendor_large),
327 ACPI_AML_SIZE_LARGE(struct aml_resource_memory32),
328 ACPI_AML_SIZE_LARGE(struct aml_resource_fixed_memory32),
329 ACPI_AML_SIZE_LARGE(struct aml_resource_address32),
330 ACPI_AML_SIZE_LARGE(struct aml_resource_address16),
331 ACPI_AML_SIZE_LARGE(struct aml_resource_extended_irq),
332 ACPI_AML_SIZE_LARGE(struct aml_resource_address64),
333 ACPI_AML_SIZE_LARGE(struct aml_resource_extended_address64),
334 ACPI_AML_SIZE_LARGE(struct aml_resource_gpio),
335 0,
336 ACPI_AML_SIZE_LARGE(struct aml_resource_common_serialbus),
337 };
338
339 const u8 acpi_gbl_resource_aml_serial_bus_sizes[] = {
340 0,
341 ACPI_AML_SIZE_LARGE(struct aml_resource_i2c_serialbus),
342 ACPI_AML_SIZE_LARGE(struct aml_resource_spi_serialbus),
343 ACPI_AML_SIZE_LARGE(struct aml_resource_uart_serialbus),
344 };
345
346 /*
347 * Resource types, used to validate the resource length field.
348 * The length of fixed-length types must match exactly, variable
349 * lengths must meet the minimum required length, etc.
350 * Zero indicates a reserved (and therefore invalid) resource type.
351 */
352 static const u8 acpi_gbl_resource_types[] = {
353 /* Small descriptors */
354
355 0,
356 0,
357 0,
358 0,
359 ACPI_SMALL_VARIABLE_LENGTH, /* 04 IRQ */
360 ACPI_FIXED_LENGTH, /* 05 DMA */
361 ACPI_SMALL_VARIABLE_LENGTH, /* 06 start_dependent_functions */
362 ACPI_FIXED_LENGTH, /* 07 end_dependent_functions */
363 ACPI_FIXED_LENGTH, /* 08 IO */
364 ACPI_FIXED_LENGTH, /* 09 fixed_IO */
365 ACPI_FIXED_LENGTH, /* 0A fixed_DMA */
366 0,
367 0,
368 0,
369 ACPI_VARIABLE_LENGTH, /* 0E vendor_short */
370 ACPI_FIXED_LENGTH, /* 0F end_tag */
371
372 /* Large descriptors */
373
374 0,
375 ACPI_FIXED_LENGTH, /* 01 Memory24 */
376 ACPI_FIXED_LENGTH, /* 02 generic_register */
377 0,
378 ACPI_VARIABLE_LENGTH, /* 04 vendor_long */
379 ACPI_FIXED_LENGTH, /* 05 Memory32 */
380 ACPI_FIXED_LENGTH, /* 06 memory32_fixed */
381 ACPI_VARIABLE_LENGTH, /* 07 Dword* address */
382 ACPI_VARIABLE_LENGTH, /* 08 Word* address */
383 ACPI_VARIABLE_LENGTH, /* 09 extended_IRQ */
384 ACPI_VARIABLE_LENGTH, /* 0A Qword* address */
385 ACPI_FIXED_LENGTH, /* 0B Extended* address */
386 ACPI_VARIABLE_LENGTH, /* 0C Gpio* */
387 0,
388 ACPI_VARIABLE_LENGTH /* 0E *serial_bus */
389 };
390
391 /*******************************************************************************
392 *
393 * FUNCTION: acpi_ut_walk_aml_resources
394 *
395 * PARAMETERS: walk_state - Current walk info
396 * PARAMETERS: aml - Pointer to the raw AML resource template
397 * aml_length - Length of the entire template
398 * user_function - Called once for each descriptor found. If
399 * NULL, a pointer to the end_tag is returned
400 * context - Passed to user_function
401 *
402 * RETURN: Status
403 *
404 * DESCRIPTION: Walk a raw AML resource list(buffer). User function called
405 * once for each resource found.
406 *
407 ******************************************************************************/
408
409 acpi_status
acpi_ut_walk_aml_resources(struct acpi_walk_state * walk_state,u8 * aml,acpi_size aml_length,acpi_walk_aml_callback user_function,void ** context)410 acpi_ut_walk_aml_resources(struct acpi_walk_state *walk_state,
411 u8 *aml,
412 acpi_size aml_length,
413 acpi_walk_aml_callback user_function, void **context)
414 {
415 acpi_status status;
416 u8 *end_aml;
417 u8 resource_index;
418 u32 length;
419 u32 offset = 0;
420 u8 end_tag[2] = { 0x79, 0x00 };
421
422 ACPI_FUNCTION_TRACE(ut_walk_aml_resources);
423
424 /* The absolute minimum resource template is one end_tag descriptor */
425
426 if (aml_length < sizeof(struct aml_resource_end_tag)) {
427 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
428 }
429
430 /* Point to the end of the resource template buffer */
431
432 end_aml = aml + aml_length;
433
434 /* Walk the byte list, abort on any invalid descriptor type or length */
435
436 while (aml < end_aml) {
437
438 /* Validate the Resource Type and Resource Length */
439
440 status =
441 acpi_ut_validate_resource(walk_state, aml, &resource_index);
442 if (ACPI_FAILURE(status)) {
443 /*
444 * Exit on failure. Cannot continue because the descriptor
445 * length may be bogus also.
446 */
447 return_ACPI_STATUS(status);
448 }
449
450 /* Get the length of this descriptor */
451
452 length = acpi_ut_get_descriptor_length(aml);
453
454 /* Invoke the user function */
455
456 if (user_function) {
457 status =
458 user_function(aml, length, offset, resource_index,
459 context);
460 if (ACPI_FAILURE(status)) {
461 return_ACPI_STATUS(status);
462 }
463 }
464
465 /* An end_tag descriptor terminates this resource template */
466
467 if (acpi_ut_get_resource_type(aml) ==
468 ACPI_RESOURCE_NAME_END_TAG) {
469 /*
470 * There must be at least one more byte in the buffer for
471 * the 2nd byte of the end_tag
472 */
473 if ((aml + 1) >= end_aml) {
474 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
475 }
476
477 /* Return the pointer to the end_tag if requested */
478
479 if (!user_function) {
480 *context = aml;
481 }
482
483 /* Normal exit */
484
485 return_ACPI_STATUS(AE_OK);
486 }
487
488 aml += length;
489 offset += length;
490 }
491
492 /* Did not find an end_tag descriptor */
493
494 if (user_function) {
495
496 /* Insert an end_tag anyway. acpi_rs_get_list_length always leaves room */
497
498 (void)acpi_ut_validate_resource(walk_state, end_tag,
499 &resource_index);
500 status =
501 user_function(end_tag, 2, offset, resource_index, context);
502 if (ACPI_FAILURE(status)) {
503 return_ACPI_STATUS(status);
504 }
505 }
506
507 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
508 }
509
510 /*******************************************************************************
511 *
512 * FUNCTION: acpi_ut_validate_resource
513 *
514 * PARAMETERS: walk_state - Current walk info
515 * aml - Pointer to the raw AML resource descriptor
516 * return_index - Where the resource index is returned. NULL
517 * if the index is not required.
518 *
519 * RETURN: Status, and optionally the Index into the global resource tables
520 *
521 * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
522 * Type and Resource Length. Returns an index into the global
523 * resource information/dispatch tables for later use.
524 *
525 ******************************************************************************/
526
527 acpi_status
acpi_ut_validate_resource(struct acpi_walk_state * walk_state,void * aml,u8 * return_index)528 acpi_ut_validate_resource(struct acpi_walk_state *walk_state,
529 void *aml, u8 *return_index)
530 {
531 union aml_resource *aml_resource;
532 u8 resource_type;
533 u8 resource_index;
534 acpi_rs_length resource_length;
535 acpi_rs_length minimum_resource_length;
536
537 ACPI_FUNCTION_ENTRY();
538
539 /*
540 * 1) Validate the resource_type field (Byte 0)
541 */
542 resource_type = ACPI_GET8(aml);
543
544 /*
545 * Byte 0 contains the descriptor name (Resource Type)
546 * Examine the large/small bit in the resource header
547 */
548 if (resource_type & ACPI_RESOURCE_NAME_LARGE) {
549
550 /* Verify the large resource type (name) against the max */
551
552 if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) {
553 goto invalid_resource;
554 }
555
556 /*
557 * Large Resource Type -- bits 6:0 contain the name
558 * Translate range 0x80-0x8B to index range 0x10-0x1B
559 */
560 resource_index = (u8) (resource_type - 0x70);
561 } else {
562 /*
563 * Small Resource Type -- bits 6:3 contain the name
564 * Shift range to index range 0x00-0x0F
565 */
566 resource_index = (u8)
567 ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
568 }
569
570 /*
571 * Check validity of the resource type, via acpi_gbl_resource_types.
572 * Zero indicates an invalid resource.
573 */
574 if (!acpi_gbl_resource_types[resource_index]) {
575 goto invalid_resource;
576 }
577
578 /*
579 * Validate the resource_length field. This ensures that the length
580 * is at least reasonable, and guarantees that it is non-zero.
581 */
582 resource_length = acpi_ut_get_resource_length(aml);
583 minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index];
584
585 /* Validate based upon the type of resource - fixed length or variable */
586
587 switch (acpi_gbl_resource_types[resource_index]) {
588 case ACPI_FIXED_LENGTH:
589
590 /* Fixed length resource, length must match exactly */
591
592 if (resource_length != minimum_resource_length) {
593 goto bad_resource_length;
594 }
595 break;
596
597 case ACPI_VARIABLE_LENGTH:
598
599 /* Variable length resource, length must be at least the minimum */
600
601 if (resource_length < minimum_resource_length) {
602 goto bad_resource_length;
603 }
604 break;
605
606 case ACPI_SMALL_VARIABLE_LENGTH:
607
608 /* Small variable length resource, length can be (Min) or (Min-1) */
609
610 if ((resource_length > minimum_resource_length) ||
611 (resource_length < (minimum_resource_length - 1))) {
612 goto bad_resource_length;
613 }
614 break;
615
616 default:
617
618 /* Shouldn't happen (because of validation earlier), but be sure */
619
620 goto invalid_resource;
621 }
622
623 aml_resource = ACPI_CAST_PTR(union aml_resource, aml);
624 if (resource_type == ACPI_RESOURCE_NAME_SERIAL_BUS) {
625
626 /* Validate the bus_type field */
627
628 if ((aml_resource->common_serial_bus.type == 0) ||
629 (aml_resource->common_serial_bus.type >
630 AML_RESOURCE_MAX_SERIALBUSTYPE)) {
631 if (walk_state) {
632 ACPI_ERROR((AE_INFO,
633 "Invalid/unsupported SerialBus resource descriptor: BusType 0x%2.2X",
634 aml_resource->common_serial_bus.
635 type));
636 }
637 return (AE_AML_INVALID_RESOURCE_TYPE);
638 }
639 }
640
641 /* Optionally return the resource table index */
642
643 if (return_index) {
644 *return_index = resource_index;
645 }
646
647 return (AE_OK);
648
649 invalid_resource:
650
651 if (walk_state) {
652 ACPI_ERROR((AE_INFO,
653 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
654 resource_type));
655 }
656 return (AE_AML_INVALID_RESOURCE_TYPE);
657
658 bad_resource_length:
659
660 if (walk_state) {
661 ACPI_ERROR((AE_INFO,
662 "Invalid resource descriptor length: Type "
663 "0x%2.2X, Length 0x%4.4X, MinLength 0x%4.4X",
664 resource_type, resource_length,
665 minimum_resource_length));
666 }
667 return (AE_AML_BAD_RESOURCE_LENGTH);
668 }
669
670 /*******************************************************************************
671 *
672 * FUNCTION: acpi_ut_get_resource_type
673 *
674 * PARAMETERS: aml - Pointer to the raw AML resource descriptor
675 *
676 * RETURN: The Resource Type with no extraneous bits (except the
677 * Large/Small descriptor bit -- this is left alone)
678 *
679 * DESCRIPTION: Extract the Resource Type/Name from the first byte of
680 * a resource descriptor.
681 *
682 ******************************************************************************/
683
acpi_ut_get_resource_type(void * aml)684 u8 acpi_ut_get_resource_type(void *aml)
685 {
686 ACPI_FUNCTION_ENTRY();
687
688 /*
689 * Byte 0 contains the descriptor name (Resource Type)
690 * Examine the large/small bit in the resource header
691 */
692 if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
693
694 /* Large Resource Type -- bits 6:0 contain the name */
695
696 return (ACPI_GET8(aml));
697 } else {
698 /* Small Resource Type -- bits 6:3 contain the name */
699
700 return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
701 }
702 }
703
704 /*******************************************************************************
705 *
706 * FUNCTION: acpi_ut_get_resource_length
707 *
708 * PARAMETERS: aml - Pointer to the raw AML resource descriptor
709 *
710 * RETURN: Byte Length
711 *
712 * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
713 * definition, this does not include the size of the descriptor
714 * header or the length field itself.
715 *
716 ******************************************************************************/
717
acpi_ut_get_resource_length(void * aml)718 u16 acpi_ut_get_resource_length(void *aml)
719 {
720 acpi_rs_length resource_length;
721
722 ACPI_FUNCTION_ENTRY();
723
724 /*
725 * Byte 0 contains the descriptor name (Resource Type)
726 * Examine the large/small bit in the resource header
727 */
728 if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
729
730 /* Large Resource type -- bytes 1-2 contain the 16-bit length */
731
732 ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1));
733
734 } else {
735 /* Small Resource type -- bits 2:0 of byte 0 contain the length */
736
737 resource_length = (u16) (ACPI_GET8(aml) &
738 ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
739 }
740
741 return (resource_length);
742 }
743
744 /*******************************************************************************
745 *
746 * FUNCTION: acpi_ut_get_resource_header_length
747 *
748 * PARAMETERS: aml - Pointer to the raw AML resource descriptor
749 *
750 * RETURN: Length of the AML header (depends on large/small descriptor)
751 *
752 * DESCRIPTION: Get the length of the header for this resource.
753 *
754 ******************************************************************************/
755
acpi_ut_get_resource_header_length(void * aml)756 u8 acpi_ut_get_resource_header_length(void *aml)
757 {
758 ACPI_FUNCTION_ENTRY();
759
760 /* Examine the large/small bit in the resource header */
761
762 if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
763 return (sizeof(struct aml_resource_large_header));
764 } else {
765 return (sizeof(struct aml_resource_small_header));
766 }
767 }
768
769 /*******************************************************************************
770 *
771 * FUNCTION: acpi_ut_get_descriptor_length
772 *
773 * PARAMETERS: aml - Pointer to the raw AML resource descriptor
774 *
775 * RETURN: Byte length
776 *
777 * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
778 * length of the descriptor header and the length field itself.
779 * Used to walk descriptor lists.
780 *
781 ******************************************************************************/
782
acpi_ut_get_descriptor_length(void * aml)783 u32 acpi_ut_get_descriptor_length(void *aml)
784 {
785 ACPI_FUNCTION_ENTRY();
786
787 /*
788 * Get the Resource Length (does not include header length) and add
789 * the header length (depends on if this is a small or large resource)
790 */
791 return (acpi_ut_get_resource_length(aml) +
792 acpi_ut_get_resource_header_length(aml));
793 }
794
795 /*******************************************************************************
796 *
797 * FUNCTION: acpi_ut_get_resource_end_tag
798 *
799 * PARAMETERS: obj_desc - The resource template buffer object
800 * end_tag - Where the pointer to the end_tag is returned
801 *
802 * RETURN: Status, pointer to the end tag
803 *
804 * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template
805 * Note: allows a buffer length of zero.
806 *
807 ******************************************************************************/
808
809 acpi_status
acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc,u8 ** end_tag)810 acpi_ut_get_resource_end_tag(union acpi_operand_object *obj_desc, u8 **end_tag)
811 {
812 acpi_status status;
813
814 ACPI_FUNCTION_TRACE(ut_get_resource_end_tag);
815
816 /* Allow a buffer length of zero */
817
818 if (!obj_desc->buffer.length) {
819 *end_tag = obj_desc->buffer.pointer;
820 return_ACPI_STATUS(AE_OK);
821 }
822
823 /* Validate the template and get a pointer to the end_tag */
824
825 status = acpi_ut_walk_aml_resources(NULL, obj_desc->buffer.pointer,
826 obj_desc->buffer.length, NULL,
827 (void **)end_tag);
828
829 return_ACPI_STATUS(status);
830 }
831