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96db255c BM |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: utresrc - Resource managment utilities | |
4 | * | |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
4a90c7e8 | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
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") |
96db255c | 49 | |
defba1d8 BM |
50 | #if defined(ACPI_DISASSEMBLER) || defined (ACPI_DEBUGGER) |
51 | /* | |
52 | * Strings used to decode resource descriptors. | |
53 | * Used by both the disasssembler and the debugger resource dump routines | |
54 | */ | |
b229cf92 BM |
55 | const char *acpi_gbl_bm_decode[] = { |
56 | "NotBusMaster", | |
57 | "BusMaster" | |
defba1d8 BM |
58 | }; |
59 | ||
b229cf92 | 60 | const char *acpi_gbl_config_decode[] = { |
defba1d8 BM |
61 | "0 - Good Configuration", |
62 | "1 - Acceptable Configuration", | |
63 | "2 - Suboptimal Configuration", | |
64 | "3 - ***Invalid Configuration***", | |
65 | }; | |
66 | ||
b229cf92 BM |
67 | const char *acpi_gbl_consume_decode[] = { |
68 | "ResourceProducer", | |
69 | "ResourceConsumer" | |
defba1d8 BM |
70 | }; |
71 | ||
b229cf92 BM |
72 | const char *acpi_gbl_dec_decode[] = { |
73 | "PosDecode", | |
74 | "SubDecode" | |
defba1d8 BM |
75 | }; |
76 | ||
b229cf92 | 77 | const char *acpi_gbl_he_decode[] = { |
defba1d8 BM |
78 | "Level", |
79 | "Edge" | |
80 | }; | |
81 | ||
b229cf92 | 82 | const char *acpi_gbl_io_decode[] = { |
defba1d8 BM |
83 | "Decode10", |
84 | "Decode16" | |
85 | }; | |
86 | ||
b229cf92 BM |
87 | const char *acpi_gbl_ll_decode[] = { |
88 | "ActiveHigh", | |
89 | "ActiveLow" | |
defba1d8 BM |
90 | }; |
91 | ||
b229cf92 BM |
92 | const char *acpi_gbl_max_decode[] = { |
93 | "MaxNotFixed", | |
94 | "MaxFixed" | |
defba1d8 BM |
95 | }; |
96 | ||
b229cf92 BM |
97 | const char *acpi_gbl_mem_decode[] = { |
98 | "NonCacheable", | |
defba1d8 | 99 | "Cacheable", |
b229cf92 | 100 | "WriteCombining", |
defba1d8 BM |
101 | "Prefetchable" |
102 | }; | |
103 | ||
b229cf92 BM |
104 | const char *acpi_gbl_min_decode[] = { |
105 | "MinNotFixed", | |
106 | "MinFixed" | |
defba1d8 BM |
107 | }; |
108 | ||
b229cf92 BM |
109 | const char *acpi_gbl_mtp_decode[] = { |
110 | "AddressRangeMemory", | |
111 | "AddressRangeReserved", | |
112 | "AddressRangeACPI", | |
113 | "AddressRangeNVS" | |
defba1d8 BM |
114 | }; |
115 | ||
b229cf92 BM |
116 | const char *acpi_gbl_rng_decode[] = { |
117 | "InvalidRanges", | |
118 | "NonISAOnlyRanges", | |
119 | "ISAOnlyRanges", | |
120 | "EntireRange" | |
defba1d8 BM |
121 | }; |
122 | ||
b229cf92 BM |
123 | const char *acpi_gbl_rw_decode[] = { |
124 | "ReadOnly", | |
125 | "ReadWrite" | |
defba1d8 BM |
126 | }; |
127 | ||
b229cf92 | 128 | const char *acpi_gbl_shr_decode[] = { |
defba1d8 BM |
129 | "Exclusive", |
130 | "Shared" | |
131 | }; | |
132 | ||
b229cf92 | 133 | const char *acpi_gbl_siz_decode[] = { |
defba1d8 BM |
134 | "Transfer8", |
135 | "Transfer8_16", | |
136 | "Transfer16", | |
b229cf92 | 137 | "InvalidSize" |
defba1d8 BM |
138 | }; |
139 | ||
b229cf92 BM |
140 | const char *acpi_gbl_trs_decode[] = { |
141 | "DenseTranslation", | |
142 | "SparseTranslation" | |
defba1d8 BM |
143 | }; |
144 | ||
b229cf92 BM |
145 | const char *acpi_gbl_ttp_decode[] = { |
146 | "TypeStatic", | |
147 | "TypeTranslation" | |
defba1d8 BM |
148 | }; |
149 | ||
b229cf92 | 150 | const char *acpi_gbl_typ_decode[] = { |
defba1d8 | 151 | "Compatibility", |
b229cf92 BM |
152 | "TypeA", |
153 | "TypeB", | |
154 | "TypeF" | |
defba1d8 BM |
155 | }; |
156 | ||
157 | #endif | |
158 | ||
96db255c BM |
159 | /* |
160 | * Base sizes of the raw AML resource descriptors, indexed by resource type. | |
161 | * Zero indicates a reserved (and therefore invalid) resource type. | |
162 | */ | |
163 | const u8 acpi_gbl_resource_aml_sizes[] = { | |
164 | /* Small descriptors */ | |
165 | ||
166 | 0, | |
167 | 0, | |
168 | 0, | |
169 | 0, | |
170 | ACPI_AML_SIZE_SMALL(struct aml_resource_irq), | |
171 | ACPI_AML_SIZE_SMALL(struct aml_resource_dma), | |
172 | ACPI_AML_SIZE_SMALL(struct aml_resource_start_dependent), | |
173 | ACPI_AML_SIZE_SMALL(struct aml_resource_end_dependent), | |
174 | ACPI_AML_SIZE_SMALL(struct aml_resource_io), | |
175 | ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_io), | |
176 | 0, | |
177 | 0, | |
178 | 0, | |
179 | 0, | |
180 | ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small), | |
181 | ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag), | |
182 | ||
183 | /* Large descriptors */ | |
184 | ||
185 | 0, | |
186 | ACPI_AML_SIZE_LARGE(struct aml_resource_memory24), | |
187 | ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register), | |
188 | 0, | |
189 | ACPI_AML_SIZE_LARGE(struct aml_resource_vendor_large), | |
190 | ACPI_AML_SIZE_LARGE(struct aml_resource_memory32), | |
191 | ACPI_AML_SIZE_LARGE(struct aml_resource_fixed_memory32), | |
192 | ACPI_AML_SIZE_LARGE(struct aml_resource_address32), | |
193 | ACPI_AML_SIZE_LARGE(struct aml_resource_address16), | |
194 | ACPI_AML_SIZE_LARGE(struct aml_resource_extended_irq), | |
195 | ACPI_AML_SIZE_LARGE(struct aml_resource_address64), | |
196 | ACPI_AML_SIZE_LARGE(struct aml_resource_extended_address64) | |
197 | }; | |
198 | ||
199 | /* | |
200 | * Resource types, used to validate the resource length field. | |
201 | * The length of fixed-length types must match exactly, variable | |
202 | * lengths must meet the minimum required length, etc. | |
203 | * Zero indicates a reserved (and therefore invalid) resource type. | |
204 | */ | |
205 | static const u8 acpi_gbl_resource_types[] = { | |
206 | /* Small descriptors */ | |
207 | ||
208 | 0, | |
209 | 0, | |
210 | 0, | |
211 | 0, | |
212 | ACPI_SMALL_VARIABLE_LENGTH, | |
213 | ACPI_FIXED_LENGTH, | |
214 | ACPI_SMALL_VARIABLE_LENGTH, | |
215 | ACPI_FIXED_LENGTH, | |
216 | ACPI_FIXED_LENGTH, | |
217 | ACPI_FIXED_LENGTH, | |
218 | 0, | |
219 | 0, | |
220 | 0, | |
221 | 0, | |
222 | ACPI_VARIABLE_LENGTH, | |
223 | ACPI_FIXED_LENGTH, | |
224 | ||
225 | /* Large descriptors */ | |
226 | ||
227 | 0, | |
228 | ACPI_FIXED_LENGTH, | |
229 | ACPI_FIXED_LENGTH, | |
230 | 0, | |
231 | ACPI_VARIABLE_LENGTH, | |
232 | ACPI_FIXED_LENGTH, | |
233 | ACPI_FIXED_LENGTH, | |
234 | ACPI_VARIABLE_LENGTH, | |
235 | ACPI_VARIABLE_LENGTH, | |
236 | ACPI_VARIABLE_LENGTH, | |
237 | ACPI_VARIABLE_LENGTH, | |
238 | ACPI_FIXED_LENGTH | |
239 | }; | |
240 | ||
61686124 BM |
241 | /******************************************************************************* |
242 | * | |
243 | * FUNCTION: acpi_ut_walk_aml_resources | |
244 | * | |
245 | * PARAMETERS: Aml - Pointer to the raw AML resource template | |
246 | * aml_length - Length of the entire template | |
247 | * user_function - Called once for each descriptor found. If | |
248 | * NULL, a pointer to the end_tag is returned | |
249 | * Context - Passed to user_function | |
250 | * | |
251 | * RETURN: Status | |
252 | * | |
253 | * DESCRIPTION: Walk a raw AML resource list(buffer). User function called | |
254 | * once for each resource found. | |
255 | * | |
256 | ******************************************************************************/ | |
257 | ||
258 | acpi_status | |
259 | acpi_ut_walk_aml_resources(u8 * aml, | |
260 | acpi_size aml_length, | |
793c2388 | 261 | acpi_walk_aml_callback user_function, void **context) |
61686124 BM |
262 | { |
263 | acpi_status status; | |
264 | u8 *end_aml; | |
265 | u8 resource_index; | |
266 | u32 length; | |
267 | u32 offset = 0; | |
268 | ||
b229cf92 | 269 | ACPI_FUNCTION_TRACE(ut_walk_aml_resources); |
61686124 BM |
270 | |
271 | /* The absolute minimum resource template is one end_tag descriptor */ | |
272 | ||
273 | if (aml_length < sizeof(struct aml_resource_end_tag)) { | |
274 | return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); | |
275 | } | |
276 | ||
277 | /* Point to the end of the resource template buffer */ | |
278 | ||
279 | end_aml = aml + aml_length; | |
280 | ||
281 | /* Walk the byte list, abort on any invalid descriptor type or length */ | |
282 | ||
283 | while (aml < end_aml) { | |
284 | ||
285 | /* Validate the Resource Type and Resource Length */ | |
286 | ||
287 | status = acpi_ut_validate_resource(aml, &resource_index); | |
288 | if (ACPI_FAILURE(status)) { | |
289 | return_ACPI_STATUS(status); | |
290 | } | |
291 | ||
292 | /* Get the length of this descriptor */ | |
293 | ||
294 | length = acpi_ut_get_descriptor_length(aml); | |
295 | ||
296 | /* Invoke the user function */ | |
297 | ||
298 | if (user_function) { | |
299 | status = | |
300 | user_function(aml, length, offset, resource_index, | |
301 | context); | |
302 | if (ACPI_FAILURE(status)) { | |
303 | return (status); | |
304 | } | |
305 | } | |
306 | ||
307 | /* An end_tag descriptor terminates this resource template */ | |
308 | ||
309 | if (acpi_ut_get_resource_type(aml) == | |
310 | ACPI_RESOURCE_NAME_END_TAG) { | |
311 | /* | |
312 | * There must be at least one more byte in the buffer for | |
313 | * the 2nd byte of the end_tag | |
314 | */ | |
315 | if ((aml + 1) >= end_aml) { | |
316 | return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); | |
317 | } | |
318 | ||
319 | /* Return the pointer to the end_tag if requested */ | |
320 | ||
321 | if (!user_function) { | |
793c2388 | 322 | *context = aml; |
61686124 BM |
323 | } |
324 | ||
325 | /* Normal exit */ | |
326 | ||
327 | return_ACPI_STATUS(AE_OK); | |
328 | } | |
329 | ||
330 | aml += length; | |
331 | offset += length; | |
332 | } | |
333 | ||
334 | /* Did not find an end_tag descriptor */ | |
335 | ||
336 | return (AE_AML_NO_RESOURCE_END_TAG); | |
337 | } | |
338 | ||
96db255c BM |
339 | /******************************************************************************* |
340 | * | |
341 | * FUNCTION: acpi_ut_validate_resource | |
342 | * | |
343 | * PARAMETERS: Aml - Pointer to the raw AML resource descriptor | |
344 | * return_index - Where the resource index is returned. NULL | |
345 | * if the index is not required. | |
346 | * | |
347 | * RETURN: Status, and optionally the Index into the global resource tables | |
348 | * | |
349 | * DESCRIPTION: Validate an AML resource descriptor by checking the Resource | |
350 | * Type and Resource Length. Returns an index into the global | |
351 | * resource information/dispatch tables for later use. | |
352 | * | |
353 | ******************************************************************************/ | |
354 | ||
355 | acpi_status acpi_ut_validate_resource(void *aml, u8 * return_index) | |
356 | { | |
357 | u8 resource_type; | |
358 | u8 resource_index; | |
359 | acpi_rs_length resource_length; | |
360 | acpi_rs_length minimum_resource_length; | |
361 | ||
362 | ACPI_FUNCTION_ENTRY(); | |
363 | ||
364 | /* | |
365 | * 1) Validate the resource_type field (Byte 0) | |
366 | */ | |
c51a4de8 | 367 | resource_type = ACPI_GET8(aml); |
96db255c BM |
368 | |
369 | /* | |
370 | * Byte 0 contains the descriptor name (Resource Type) | |
371 | * Examine the large/small bit in the resource header | |
372 | */ | |
373 | if (resource_type & ACPI_RESOURCE_NAME_LARGE) { | |
52fc0b02 | 374 | |
96db255c BM |
375 | /* Verify the large resource type (name) against the max */ |
376 | ||
377 | if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) { | |
378 | return (AE_AML_INVALID_RESOURCE_TYPE); | |
379 | } | |
380 | ||
381 | /* | |
382 | * Large Resource Type -- bits 6:0 contain the name | |
383 | * Translate range 0x80-0x8B to index range 0x10-0x1B | |
384 | */ | |
385 | resource_index = (u8) (resource_type - 0x70); | |
386 | } else { | |
387 | /* | |
388 | * Small Resource Type -- bits 6:3 contain the name | |
389 | * Shift range to index range 0x00-0x0F | |
390 | */ | |
391 | resource_index = (u8) | |
392 | ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3); | |
393 | } | |
394 | ||
395 | /* Check validity of the resource type, zero indicates name is invalid */ | |
396 | ||
397 | if (!acpi_gbl_resource_types[resource_index]) { | |
398 | return (AE_AML_INVALID_RESOURCE_TYPE); | |
399 | } | |
400 | ||
401 | /* | |
402 | * 2) Validate the resource_length field. This ensures that the length | |
403 | * is at least reasonable, and guarantees that it is non-zero. | |
404 | */ | |
405 | resource_length = acpi_ut_get_resource_length(aml); | |
406 | minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index]; | |
407 | ||
408 | /* Validate based upon the type of resource - fixed length or variable */ | |
409 | ||
410 | switch (acpi_gbl_resource_types[resource_index]) { | |
411 | case ACPI_FIXED_LENGTH: | |
412 | ||
413 | /* Fixed length resource, length must match exactly */ | |
414 | ||
415 | if (resource_length != minimum_resource_length) { | |
416 | return (AE_AML_BAD_RESOURCE_LENGTH); | |
417 | } | |
418 | break; | |
419 | ||
420 | case ACPI_VARIABLE_LENGTH: | |
421 | ||
422 | /* Variable length resource, length must be at least the minimum */ | |
423 | ||
424 | if (resource_length < minimum_resource_length) { | |
425 | return (AE_AML_BAD_RESOURCE_LENGTH); | |
426 | } | |
427 | break; | |
428 | ||
429 | case ACPI_SMALL_VARIABLE_LENGTH: | |
430 | ||
431 | /* Small variable length resource, length can be (Min) or (Min-1) */ | |
432 | ||
433 | if ((resource_length > minimum_resource_length) || | |
434 | (resource_length < (minimum_resource_length - 1))) { | |
435 | return (AE_AML_BAD_RESOURCE_LENGTH); | |
436 | } | |
437 | break; | |
438 | ||
439 | default: | |
440 | ||
441 | /* Shouldn't happen (because of validation earlier), but be sure */ | |
442 | ||
443 | return (AE_AML_INVALID_RESOURCE_TYPE); | |
444 | } | |
445 | ||
446 | /* Optionally return the resource table index */ | |
447 | ||
448 | if (return_index) { | |
449 | *return_index = resource_index; | |
450 | } | |
451 | ||
452 | return (AE_OK); | |
453 | } | |
454 | ||
455 | /******************************************************************************* | |
456 | * | |
457 | * FUNCTION: acpi_ut_get_resource_type | |
458 | * | |
459 | * PARAMETERS: Aml - Pointer to the raw AML resource descriptor | |
460 | * | |
461 | * RETURN: The Resource Type with no extraneous bits (except the | |
462 | * Large/Small descriptor bit -- this is left alone) | |
463 | * | |
464 | * DESCRIPTION: Extract the Resource Type/Name from the first byte of | |
465 | * a resource descriptor. | |
466 | * | |
467 | ******************************************************************************/ | |
468 | ||
469 | u8 acpi_ut_get_resource_type(void *aml) | |
470 | { | |
471 | ACPI_FUNCTION_ENTRY(); | |
472 | ||
473 | /* | |
474 | * Byte 0 contains the descriptor name (Resource Type) | |
475 | * Examine the large/small bit in the resource header | |
476 | */ | |
c51a4de8 | 477 | if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) { |
52fc0b02 | 478 | |
96db255c BM |
479 | /* Large Resource Type -- bits 6:0 contain the name */ |
480 | ||
c51a4de8 | 481 | return (ACPI_GET8(aml)); |
96db255c BM |
482 | } else { |
483 | /* Small Resource Type -- bits 6:3 contain the name */ | |
484 | ||
c51a4de8 | 485 | return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK)); |
96db255c BM |
486 | } |
487 | } | |
488 | ||
489 | /******************************************************************************* | |
490 | * | |
491 | * FUNCTION: acpi_ut_get_resource_length | |
492 | * | |
493 | * PARAMETERS: Aml - Pointer to the raw AML resource descriptor | |
494 | * | |
495 | * RETURN: Byte Length | |
496 | * | |
497 | * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By | |
498 | * definition, this does not include the size of the descriptor | |
499 | * header or the length field itself. | |
500 | * | |
501 | ******************************************************************************/ | |
502 | ||
503 | u16 acpi_ut_get_resource_length(void *aml) | |
504 | { | |
505 | acpi_rs_length resource_length; | |
506 | ||
507 | ACPI_FUNCTION_ENTRY(); | |
508 | ||
509 | /* | |
510 | * Byte 0 contains the descriptor name (Resource Type) | |
511 | * Examine the large/small bit in the resource header | |
512 | */ | |
c51a4de8 | 513 | if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) { |
52fc0b02 | 514 | |
96db255c BM |
515 | /* Large Resource type -- bytes 1-2 contain the 16-bit length */ |
516 | ||
c51a4de8 | 517 | ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1)); |
96db255c BM |
518 | |
519 | } else { | |
520 | /* Small Resource type -- bits 2:0 of byte 0 contain the length */ | |
521 | ||
c51a4de8 | 522 | resource_length = (u16) (ACPI_GET8(aml) & |
96db255c BM |
523 | ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK); |
524 | } | |
525 | ||
526 | return (resource_length); | |
527 | } | |
528 | ||
529 | /******************************************************************************* | |
530 | * | |
531 | * FUNCTION: acpi_ut_get_resource_header_length | |
532 | * | |
533 | * PARAMETERS: Aml - Pointer to the raw AML resource descriptor | |
534 | * | |
535 | * RETURN: Length of the AML header (depends on large/small descriptor) | |
536 | * | |
537 | * DESCRIPTION: Get the length of the header for this resource. | |
538 | * | |
539 | ******************************************************************************/ | |
540 | ||
541 | u8 acpi_ut_get_resource_header_length(void *aml) | |
542 | { | |
543 | ACPI_FUNCTION_ENTRY(); | |
544 | ||
545 | /* Examine the large/small bit in the resource header */ | |
546 | ||
c51a4de8 | 547 | if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) { |
96db255c BM |
548 | return (sizeof(struct aml_resource_large_header)); |
549 | } else { | |
550 | return (sizeof(struct aml_resource_small_header)); | |
551 | } | |
552 | } | |
553 | ||
554 | /******************************************************************************* | |
555 | * | |
556 | * FUNCTION: acpi_ut_get_descriptor_length | |
557 | * | |
558 | * PARAMETERS: Aml - Pointer to the raw AML resource descriptor | |
559 | * | |
560 | * RETURN: Byte length | |
561 | * | |
562 | * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the | |
563 | * length of the descriptor header and the length field itself. | |
564 | * Used to walk descriptor lists. | |
565 | * | |
566 | ******************************************************************************/ | |
567 | ||
568 | u32 acpi_ut_get_descriptor_length(void *aml) | |
569 | { | |
570 | ACPI_FUNCTION_ENTRY(); | |
571 | ||
572 | /* | |
573 | * Get the Resource Length (does not include header length) and add | |
574 | * the header length (depends on if this is a small or large resource) | |
575 | */ | |
576 | return (acpi_ut_get_resource_length(aml) + | |
577 | acpi_ut_get_resource_header_length(aml)); | |
578 | } | |
579 | ||
580 | /******************************************************************************* | |
581 | * | |
582 | * FUNCTION: acpi_ut_get_resource_end_tag | |
583 | * | |
584 | * PARAMETERS: obj_desc - The resource template buffer object | |
c51a4de8 | 585 | * end_tag - Where the pointer to the end_tag is returned |
96db255c | 586 | * |
c51a4de8 | 587 | * RETURN: Status, pointer to the end tag |
96db255c BM |
588 | * |
589 | * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template | |
b8e4d893 | 590 | * Note: allows a buffer length of zero. |
96db255c BM |
591 | * |
592 | ******************************************************************************/ | |
593 | ||
594 | acpi_status | |
595 | acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc, | |
596 | u8 ** end_tag) | |
597 | { | |
598 | acpi_status status; | |
96db255c | 599 | |
b229cf92 | 600 | ACPI_FUNCTION_TRACE(ut_get_resource_end_tag); |
96db255c | 601 | |
b8e4d893 BM |
602 | /* Allow a buffer length of zero */ |
603 | ||
604 | if (!obj_desc->buffer.length) { | |
61686124 | 605 | *end_tag = obj_desc->buffer.pointer; |
b8e4d893 BM |
606 | return_ACPI_STATUS(AE_OK); |
607 | } | |
608 | ||
61686124 | 609 | /* Validate the template and get a pointer to the end_tag */ |
96db255c | 610 | |
61686124 BM |
611 | status = acpi_ut_walk_aml_resources(obj_desc->buffer.pointer, |
612 | obj_desc->buffer.length, NULL, | |
793c2388 | 613 | (void **)end_tag); |
96db255c | 614 | |
61686124 | 615 | return_ACPI_STATUS(status); |
96db255c | 616 | } |