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96db255c BM |
1 | /******************************************************************************* |
2 | * | |
3c5f9be4 | 3 | * Module Name: utresrc - Resource management utilities |
96db255c BM |
4 | * |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
75a44ce0 | 8 | * Copyright (C) 2000 - 2008, Intel Corp. |
96db255c BM |
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 <acpi/amlresrc.h> | |
46 | ||
47 | #define _COMPONENT ACPI_UTILITIES | |
b229cf92 | 48 | ACPI_MODULE_NAME("utresrc") |
defba1d8 BM |
49 | #if defined(ACPI_DISASSEMBLER) || defined (ACPI_DEBUGGER) |
50 | /* | |
51 | * Strings used to decode resource descriptors. | |
52 | * Used by both the disasssembler and the debugger resource dump routines | |
53 | */ | |
b229cf92 BM |
54 | const char *acpi_gbl_bm_decode[] = { |
55 | "NotBusMaster", | |
56 | "BusMaster" | |
defba1d8 BM |
57 | }; |
58 | ||
b229cf92 | 59 | const char *acpi_gbl_config_decode[] = { |
defba1d8 BM |
60 | "0 - Good Configuration", |
61 | "1 - Acceptable Configuration", | |
62 | "2 - Suboptimal Configuration", | |
63 | "3 - ***Invalid Configuration***", | |
64 | }; | |
65 | ||
b229cf92 BM |
66 | const char *acpi_gbl_consume_decode[] = { |
67 | "ResourceProducer", | |
68 | "ResourceConsumer" | |
defba1d8 BM |
69 | }; |
70 | ||
b229cf92 BM |
71 | const char *acpi_gbl_dec_decode[] = { |
72 | "PosDecode", | |
73 | "SubDecode" | |
defba1d8 BM |
74 | }; |
75 | ||
b229cf92 | 76 | const char *acpi_gbl_he_decode[] = { |
defba1d8 BM |
77 | "Level", |
78 | "Edge" | |
79 | }; | |
80 | ||
b229cf92 | 81 | const char *acpi_gbl_io_decode[] = { |
defba1d8 BM |
82 | "Decode10", |
83 | "Decode16" | |
84 | }; | |
85 | ||
b229cf92 BM |
86 | const char *acpi_gbl_ll_decode[] = { |
87 | "ActiveHigh", | |
88 | "ActiveLow" | |
defba1d8 BM |
89 | }; |
90 | ||
b229cf92 BM |
91 | const char *acpi_gbl_max_decode[] = { |
92 | "MaxNotFixed", | |
93 | "MaxFixed" | |
defba1d8 BM |
94 | }; |
95 | ||
b229cf92 BM |
96 | const char *acpi_gbl_mem_decode[] = { |
97 | "NonCacheable", | |
defba1d8 | 98 | "Cacheable", |
b229cf92 | 99 | "WriteCombining", |
defba1d8 BM |
100 | "Prefetchable" |
101 | }; | |
102 | ||
b229cf92 BM |
103 | const char *acpi_gbl_min_decode[] = { |
104 | "MinNotFixed", | |
105 | "MinFixed" | |
defba1d8 BM |
106 | }; |
107 | ||
b229cf92 BM |
108 | const char *acpi_gbl_mtp_decode[] = { |
109 | "AddressRangeMemory", | |
110 | "AddressRangeReserved", | |
111 | "AddressRangeACPI", | |
112 | "AddressRangeNVS" | |
defba1d8 BM |
113 | }; |
114 | ||
b229cf92 BM |
115 | const char *acpi_gbl_rng_decode[] = { |
116 | "InvalidRanges", | |
117 | "NonISAOnlyRanges", | |
118 | "ISAOnlyRanges", | |
119 | "EntireRange" | |
defba1d8 BM |
120 | }; |
121 | ||
b229cf92 BM |
122 | const char *acpi_gbl_rw_decode[] = { |
123 | "ReadOnly", | |
124 | "ReadWrite" | |
defba1d8 BM |
125 | }; |
126 | ||
b229cf92 | 127 | const char *acpi_gbl_shr_decode[] = { |
defba1d8 BM |
128 | "Exclusive", |
129 | "Shared" | |
130 | }; | |
131 | ||
b229cf92 | 132 | const char *acpi_gbl_siz_decode[] = { |
defba1d8 BM |
133 | "Transfer8", |
134 | "Transfer8_16", | |
135 | "Transfer16", | |
b229cf92 | 136 | "InvalidSize" |
defba1d8 BM |
137 | }; |
138 | ||
b229cf92 BM |
139 | const char *acpi_gbl_trs_decode[] = { |
140 | "DenseTranslation", | |
141 | "SparseTranslation" | |
defba1d8 BM |
142 | }; |
143 | ||
b229cf92 BM |
144 | const char *acpi_gbl_ttp_decode[] = { |
145 | "TypeStatic", | |
146 | "TypeTranslation" | |
defba1d8 BM |
147 | }; |
148 | ||
b229cf92 | 149 | const char *acpi_gbl_typ_decode[] = { |
defba1d8 | 150 | "Compatibility", |
b229cf92 BM |
151 | "TypeA", |
152 | "TypeB", | |
153 | "TypeF" | |
defba1d8 BM |
154 | }; |
155 | ||
156 | #endif | |
157 | ||
96db255c BM |
158 | /* |
159 | * Base sizes of the raw AML resource descriptors, indexed by resource type. | |
160 | * Zero indicates a reserved (and therefore invalid) resource type. | |
161 | */ | |
162 | const u8 acpi_gbl_resource_aml_sizes[] = { | |
163 | /* Small descriptors */ | |
164 | ||
165 | 0, | |
166 | 0, | |
167 | 0, | |
168 | 0, | |
169 | ACPI_AML_SIZE_SMALL(struct aml_resource_irq), | |
170 | ACPI_AML_SIZE_SMALL(struct aml_resource_dma), | |
171 | ACPI_AML_SIZE_SMALL(struct aml_resource_start_dependent), | |
172 | ACPI_AML_SIZE_SMALL(struct aml_resource_end_dependent), | |
173 | ACPI_AML_SIZE_SMALL(struct aml_resource_io), | |
174 | ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_io), | |
175 | 0, | |
176 | 0, | |
177 | 0, | |
178 | 0, | |
179 | ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small), | |
180 | ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag), | |
181 | ||
182 | /* Large descriptors */ | |
183 | ||
184 | 0, | |
185 | ACPI_AML_SIZE_LARGE(struct aml_resource_memory24), | |
186 | ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register), | |
187 | 0, | |
188 | ACPI_AML_SIZE_LARGE(struct aml_resource_vendor_large), | |
189 | ACPI_AML_SIZE_LARGE(struct aml_resource_memory32), | |
190 | ACPI_AML_SIZE_LARGE(struct aml_resource_fixed_memory32), | |
191 | ACPI_AML_SIZE_LARGE(struct aml_resource_address32), | |
192 | ACPI_AML_SIZE_LARGE(struct aml_resource_address16), | |
193 | ACPI_AML_SIZE_LARGE(struct aml_resource_extended_irq), | |
194 | ACPI_AML_SIZE_LARGE(struct aml_resource_address64), | |
195 | ACPI_AML_SIZE_LARGE(struct aml_resource_extended_address64) | |
196 | }; | |
197 | ||
198 | /* | |
199 | * Resource types, used to validate the resource length field. | |
200 | * The length of fixed-length types must match exactly, variable | |
201 | * lengths must meet the minimum required length, etc. | |
202 | * Zero indicates a reserved (and therefore invalid) resource type. | |
203 | */ | |
204 | static const u8 acpi_gbl_resource_types[] = { | |
205 | /* Small descriptors */ | |
206 | ||
207 | 0, | |
208 | 0, | |
209 | 0, | |
210 | 0, | |
211 | ACPI_SMALL_VARIABLE_LENGTH, | |
212 | ACPI_FIXED_LENGTH, | |
213 | ACPI_SMALL_VARIABLE_LENGTH, | |
214 | ACPI_FIXED_LENGTH, | |
215 | ACPI_FIXED_LENGTH, | |
216 | ACPI_FIXED_LENGTH, | |
217 | 0, | |
218 | 0, | |
219 | 0, | |
220 | 0, | |
221 | ACPI_VARIABLE_LENGTH, | |
222 | ACPI_FIXED_LENGTH, | |
223 | ||
224 | /* Large descriptors */ | |
225 | ||
226 | 0, | |
227 | ACPI_FIXED_LENGTH, | |
228 | ACPI_FIXED_LENGTH, | |
229 | 0, | |
230 | ACPI_VARIABLE_LENGTH, | |
231 | ACPI_FIXED_LENGTH, | |
232 | ACPI_FIXED_LENGTH, | |
233 | ACPI_VARIABLE_LENGTH, | |
234 | ACPI_VARIABLE_LENGTH, | |
235 | ACPI_VARIABLE_LENGTH, | |
236 | ACPI_VARIABLE_LENGTH, | |
237 | ACPI_FIXED_LENGTH | |
238 | }; | |
239 | ||
61686124 BM |
240 | /******************************************************************************* |
241 | * | |
242 | * FUNCTION: acpi_ut_walk_aml_resources | |
243 | * | |
244 | * PARAMETERS: Aml - Pointer to the raw AML resource template | |
245 | * aml_length - Length of the entire template | |
246 | * user_function - Called once for each descriptor found. If | |
247 | * NULL, a pointer to the end_tag is returned | |
248 | * Context - Passed to user_function | |
249 | * | |
250 | * RETURN: Status | |
251 | * | |
252 | * DESCRIPTION: Walk a raw AML resource list(buffer). User function called | |
253 | * once for each resource found. | |
254 | * | |
255 | ******************************************************************************/ | |
256 | ||
257 | acpi_status | |
258 | acpi_ut_walk_aml_resources(u8 * aml, | |
259 | acpi_size aml_length, | |
793c2388 | 260 | acpi_walk_aml_callback user_function, void **context) |
61686124 BM |
261 | { |
262 | acpi_status status; | |
263 | u8 *end_aml; | |
264 | u8 resource_index; | |
265 | u32 length; | |
266 | u32 offset = 0; | |
267 | ||
b229cf92 | 268 | ACPI_FUNCTION_TRACE(ut_walk_aml_resources); |
61686124 BM |
269 | |
270 | /* The absolute minimum resource template is one end_tag descriptor */ | |
271 | ||
272 | if (aml_length < sizeof(struct aml_resource_end_tag)) { | |
273 | return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); | |
274 | } | |
275 | ||
276 | /* Point to the end of the resource template buffer */ | |
277 | ||
278 | end_aml = aml + aml_length; | |
279 | ||
280 | /* Walk the byte list, abort on any invalid descriptor type or length */ | |
281 | ||
282 | while (aml < end_aml) { | |
283 | ||
284 | /* Validate the Resource Type and Resource Length */ | |
285 | ||
286 | status = acpi_ut_validate_resource(aml, &resource_index); | |
287 | if (ACPI_FAILURE(status)) { | |
288 | return_ACPI_STATUS(status); | |
289 | } | |
290 | ||
291 | /* Get the length of this descriptor */ | |
292 | ||
293 | length = acpi_ut_get_descriptor_length(aml); | |
294 | ||
295 | /* Invoke the user function */ | |
296 | ||
297 | if (user_function) { | |
298 | status = | |
299 | user_function(aml, length, offset, resource_index, | |
300 | context); | |
301 | if (ACPI_FAILURE(status)) { | |
302 | return (status); | |
303 | } | |
304 | } | |
305 | ||
306 | /* An end_tag descriptor terminates this resource template */ | |
307 | ||
308 | if (acpi_ut_get_resource_type(aml) == | |
309 | ACPI_RESOURCE_NAME_END_TAG) { | |
310 | /* | |
311 | * There must be at least one more byte in the buffer for | |
312 | * the 2nd byte of the end_tag | |
313 | */ | |
314 | if ((aml + 1) >= end_aml) { | |
315 | return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); | |
316 | } | |
317 | ||
318 | /* Return the pointer to the end_tag if requested */ | |
319 | ||
320 | if (!user_function) { | |
793c2388 | 321 | *context = aml; |
61686124 BM |
322 | } |
323 | ||
324 | /* Normal exit */ | |
325 | ||
326 | return_ACPI_STATUS(AE_OK); | |
327 | } | |
328 | ||
329 | aml += length; | |
330 | offset += length; | |
331 | } | |
332 | ||
333 | /* Did not find an end_tag descriptor */ | |
334 | ||
335 | return (AE_AML_NO_RESOURCE_END_TAG); | |
336 | } | |
337 | ||
96db255c BM |
338 | /******************************************************************************* |
339 | * | |
340 | * FUNCTION: acpi_ut_validate_resource | |
341 | * | |
342 | * PARAMETERS: Aml - Pointer to the raw AML resource descriptor | |
343 | * return_index - Where the resource index is returned. NULL | |
344 | * if the index is not required. | |
345 | * | |
346 | * RETURN: Status, and optionally the Index into the global resource tables | |
347 | * | |
348 | * DESCRIPTION: Validate an AML resource descriptor by checking the Resource | |
349 | * Type and Resource Length. Returns an index into the global | |
350 | * resource information/dispatch tables for later use. | |
351 | * | |
352 | ******************************************************************************/ | |
353 | ||
354 | acpi_status acpi_ut_validate_resource(void *aml, u8 * return_index) | |
355 | { | |
356 | u8 resource_type; | |
357 | u8 resource_index; | |
358 | acpi_rs_length resource_length; | |
359 | acpi_rs_length minimum_resource_length; | |
360 | ||
361 | ACPI_FUNCTION_ENTRY(); | |
362 | ||
363 | /* | |
364 | * 1) Validate the resource_type field (Byte 0) | |
365 | */ | |
c51a4de8 | 366 | resource_type = ACPI_GET8(aml); |
96db255c BM |
367 | |
368 | /* | |
369 | * Byte 0 contains the descriptor name (Resource Type) | |
370 | * Examine the large/small bit in the resource header | |
371 | */ | |
372 | if (resource_type & ACPI_RESOURCE_NAME_LARGE) { | |
52fc0b02 | 373 | |
96db255c BM |
374 | /* Verify the large resource type (name) against the max */ |
375 | ||
376 | if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) { | |
377 | return (AE_AML_INVALID_RESOURCE_TYPE); | |
378 | } | |
379 | ||
380 | /* | |
381 | * Large Resource Type -- bits 6:0 contain the name | |
382 | * Translate range 0x80-0x8B to index range 0x10-0x1B | |
383 | */ | |
384 | resource_index = (u8) (resource_type - 0x70); | |
385 | } else { | |
386 | /* | |
387 | * Small Resource Type -- bits 6:3 contain the name | |
388 | * Shift range to index range 0x00-0x0F | |
389 | */ | |
390 | resource_index = (u8) | |
391 | ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3); | |
392 | } | |
393 | ||
394 | /* Check validity of the resource type, zero indicates name is invalid */ | |
395 | ||
396 | if (!acpi_gbl_resource_types[resource_index]) { | |
397 | return (AE_AML_INVALID_RESOURCE_TYPE); | |
398 | } | |
399 | ||
400 | /* | |
401 | * 2) Validate the resource_length field. This ensures that the length | |
402 | * is at least reasonable, and guarantees that it is non-zero. | |
403 | */ | |
404 | resource_length = acpi_ut_get_resource_length(aml); | |
405 | minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index]; | |
406 | ||
407 | /* Validate based upon the type of resource - fixed length or variable */ | |
408 | ||
409 | switch (acpi_gbl_resource_types[resource_index]) { | |
410 | case ACPI_FIXED_LENGTH: | |
411 | ||
412 | /* Fixed length resource, length must match exactly */ | |
413 | ||
414 | if (resource_length != minimum_resource_length) { | |
415 | return (AE_AML_BAD_RESOURCE_LENGTH); | |
416 | } | |
417 | break; | |
418 | ||
419 | case ACPI_VARIABLE_LENGTH: | |
420 | ||
421 | /* Variable length resource, length must be at least the minimum */ | |
422 | ||
423 | if (resource_length < minimum_resource_length) { | |
424 | return (AE_AML_BAD_RESOURCE_LENGTH); | |
425 | } | |
426 | break; | |
427 | ||
428 | case ACPI_SMALL_VARIABLE_LENGTH: | |
429 | ||
430 | /* Small variable length resource, length can be (Min) or (Min-1) */ | |
431 | ||
432 | if ((resource_length > minimum_resource_length) || | |
433 | (resource_length < (minimum_resource_length - 1))) { | |
434 | return (AE_AML_BAD_RESOURCE_LENGTH); | |
435 | } | |
436 | break; | |
437 | ||
438 | default: | |
439 | ||
440 | /* Shouldn't happen (because of validation earlier), but be sure */ | |
441 | ||
442 | return (AE_AML_INVALID_RESOURCE_TYPE); | |
443 | } | |
444 | ||
445 | /* Optionally return the resource table index */ | |
446 | ||
447 | if (return_index) { | |
448 | *return_index = resource_index; | |
449 | } | |
450 | ||
451 | return (AE_OK); | |
452 | } | |
453 | ||
454 | /******************************************************************************* | |
455 | * | |
456 | * FUNCTION: acpi_ut_get_resource_type | |
457 | * | |
458 | * PARAMETERS: Aml - Pointer to the raw AML resource descriptor | |
459 | * | |
460 | * RETURN: The Resource Type with no extraneous bits (except the | |
461 | * Large/Small descriptor bit -- this is left alone) | |
462 | * | |
463 | * DESCRIPTION: Extract the Resource Type/Name from the first byte of | |
464 | * a resource descriptor. | |
465 | * | |
466 | ******************************************************************************/ | |
467 | ||
468 | u8 acpi_ut_get_resource_type(void *aml) | |
469 | { | |
470 | ACPI_FUNCTION_ENTRY(); | |
471 | ||
472 | /* | |
473 | * Byte 0 contains the descriptor name (Resource Type) | |
474 | * Examine the large/small bit in the resource header | |
475 | */ | |
c51a4de8 | 476 | if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) { |
52fc0b02 | 477 | |
96db255c BM |
478 | /* Large Resource Type -- bits 6:0 contain the name */ |
479 | ||
c51a4de8 | 480 | return (ACPI_GET8(aml)); |
96db255c BM |
481 | } else { |
482 | /* Small Resource Type -- bits 6:3 contain the name */ | |
483 | ||
c51a4de8 | 484 | return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK)); |
96db255c BM |
485 | } |
486 | } | |
487 | ||
488 | /******************************************************************************* | |
489 | * | |
490 | * FUNCTION: acpi_ut_get_resource_length | |
491 | * | |
492 | * PARAMETERS: Aml - Pointer to the raw AML resource descriptor | |
493 | * | |
494 | * RETURN: Byte Length | |
495 | * | |
496 | * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By | |
497 | * definition, this does not include the size of the descriptor | |
498 | * header or the length field itself. | |
499 | * | |
500 | ******************************************************************************/ | |
501 | ||
502 | u16 acpi_ut_get_resource_length(void *aml) | |
503 | { | |
504 | acpi_rs_length resource_length; | |
505 | ||
506 | ACPI_FUNCTION_ENTRY(); | |
507 | ||
508 | /* | |
509 | * Byte 0 contains the descriptor name (Resource Type) | |
510 | * Examine the large/small bit in the resource header | |
511 | */ | |
c51a4de8 | 512 | if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) { |
52fc0b02 | 513 | |
96db255c BM |
514 | /* Large Resource type -- bytes 1-2 contain the 16-bit length */ |
515 | ||
c51a4de8 | 516 | ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1)); |
96db255c BM |
517 | |
518 | } else { | |
519 | /* Small Resource type -- bits 2:0 of byte 0 contain the length */ | |
520 | ||
c51a4de8 | 521 | resource_length = (u16) (ACPI_GET8(aml) & |
96db255c BM |
522 | ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK); |
523 | } | |
524 | ||
525 | return (resource_length); | |
526 | } | |
527 | ||
528 | /******************************************************************************* | |
529 | * | |
530 | * FUNCTION: acpi_ut_get_resource_header_length | |
531 | * | |
532 | * PARAMETERS: Aml - Pointer to the raw AML resource descriptor | |
533 | * | |
534 | * RETURN: Length of the AML header (depends on large/small descriptor) | |
535 | * | |
536 | * DESCRIPTION: Get the length of the header for this resource. | |
537 | * | |
538 | ******************************************************************************/ | |
539 | ||
540 | u8 acpi_ut_get_resource_header_length(void *aml) | |
541 | { | |
542 | ACPI_FUNCTION_ENTRY(); | |
543 | ||
544 | /* Examine the large/small bit in the resource header */ | |
545 | ||
c51a4de8 | 546 | if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) { |
96db255c BM |
547 | return (sizeof(struct aml_resource_large_header)); |
548 | } else { | |
549 | return (sizeof(struct aml_resource_small_header)); | |
550 | } | |
551 | } | |
552 | ||
553 | /******************************************************************************* | |
554 | * | |
555 | * FUNCTION: acpi_ut_get_descriptor_length | |
556 | * | |
557 | * PARAMETERS: Aml - Pointer to the raw AML resource descriptor | |
558 | * | |
559 | * RETURN: Byte length | |
560 | * | |
561 | * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the | |
562 | * length of the descriptor header and the length field itself. | |
563 | * Used to walk descriptor lists. | |
564 | * | |
565 | ******************************************************************************/ | |
566 | ||
567 | u32 acpi_ut_get_descriptor_length(void *aml) | |
568 | { | |
569 | ACPI_FUNCTION_ENTRY(); | |
570 | ||
571 | /* | |
572 | * Get the Resource Length (does not include header length) and add | |
573 | * the header length (depends on if this is a small or large resource) | |
574 | */ | |
575 | return (acpi_ut_get_resource_length(aml) + | |
576 | acpi_ut_get_resource_header_length(aml)); | |
577 | } | |
578 | ||
579 | /******************************************************************************* | |
580 | * | |
581 | * FUNCTION: acpi_ut_get_resource_end_tag | |
582 | * | |
583 | * PARAMETERS: obj_desc - The resource template buffer object | |
c51a4de8 | 584 | * end_tag - Where the pointer to the end_tag is returned |
96db255c | 585 | * |
c51a4de8 | 586 | * RETURN: Status, pointer to the end tag |
96db255c BM |
587 | * |
588 | * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template | |
b8e4d893 | 589 | * Note: allows a buffer length of zero. |
96db255c BM |
590 | * |
591 | ******************************************************************************/ | |
592 | ||
593 | acpi_status | |
594 | acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc, | |
595 | u8 ** end_tag) | |
596 | { | |
597 | acpi_status status; | |
96db255c | 598 | |
b229cf92 | 599 | ACPI_FUNCTION_TRACE(ut_get_resource_end_tag); |
96db255c | 600 | |
b8e4d893 BM |
601 | /* Allow a buffer length of zero */ |
602 | ||
603 | if (!obj_desc->buffer.length) { | |
61686124 | 604 | *end_tag = obj_desc->buffer.pointer; |
b8e4d893 BM |
605 | return_ACPI_STATUS(AE_OK); |
606 | } | |
607 | ||
61686124 | 608 | /* Validate the template and get a pointer to the end_tag */ |
96db255c | 609 | |
61686124 BM |
610 | status = acpi_ut_walk_aml_resources(obj_desc->buffer.pointer, |
611 | obj_desc->buffer.length, NULL, | |
793c2388 | 612 | (void **)end_tag); |
96db255c | 613 | |
61686124 | 614 | return_ACPI_STATUS(status); |
96db255c | 615 | } |