1 /*******************************************************************************
3 * Module Name: utresrc - Resource managment utilities
5 ******************************************************************************/
8 * Copyright (C) 2000 - 2007, R. Byron Moore
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
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
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41 * POSSIBILITY OF SUCH DAMAGES.
44 #include <acpi/acpi.h>
45 #include <acpi/amlresrc.h>
47 #define _COMPONENT ACPI_UTILITIES
48 ACPI_MODULE_NAME("utresrc")
50 #if defined(ACPI_DISASSEMBLER) || defined (ACPI_DEBUGGER)
52 * Strings used to decode resource descriptors.
53 * Used by both the disasssembler and the debugger resource dump routines
55 const char *acpi_gbl_bm_decode[] = {
60 const char *acpi_gbl_config_decode[] = {
61 "0 - Good Configuration",
62 "1 - Acceptable Configuration",
63 "2 - Suboptimal Configuration",
64 "3 - ***Invalid Configuration***",
67 const char *acpi_gbl_consume_decode[] = {
72 const char *acpi_gbl_dec_decode[] = {
77 const char *acpi_gbl_he_decode[] = {
82 const char *acpi_gbl_io_decode[] = {
87 const char *acpi_gbl_ll_decode[] = {
92 const char *acpi_gbl_max_decode[] = {
97 const char *acpi_gbl_mem_decode[] = {
104 const char *acpi_gbl_min_decode[] = {
109 const char *acpi_gbl_mtp_decode[] = {
110 "AddressRangeMemory",
111 "AddressRangeReserved",
116 const char *acpi_gbl_rng_decode[] = {
123 const char *acpi_gbl_rw_decode[] = {
128 const char *acpi_gbl_shr_decode[] = {
133 const char *acpi_gbl_siz_decode[] = {
140 const char *acpi_gbl_trs_decode[] = {
145 const char *acpi_gbl_ttp_decode[] = {
150 const char *acpi_gbl_typ_decode[] = {
160 * Base sizes of the raw AML resource descriptors, indexed by resource type.
161 * Zero indicates a reserved (and therefore invalid) resource type.
163 const u8 acpi_gbl_resource_aml_sizes[] = {
164 /* Small descriptors */
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),
180 ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small),
181 ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag),
183 /* Large descriptors */
186 ACPI_AML_SIZE_LARGE(struct aml_resource_memory24),
187 ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register),
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)
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.
205 static const u8 acpi_gbl_resource_types[] = {
206 /* Small descriptors */
212 ACPI_SMALL_VARIABLE_LENGTH,
214 ACPI_SMALL_VARIABLE_LENGTH,
222 ACPI_VARIABLE_LENGTH,
225 /* Large descriptors */
231 ACPI_VARIABLE_LENGTH,
234 ACPI_VARIABLE_LENGTH,
235 ACPI_VARIABLE_LENGTH,
236 ACPI_VARIABLE_LENGTH,
237 ACPI_VARIABLE_LENGTH,
241 /*******************************************************************************
243 * FUNCTION: acpi_ut_walk_aml_resources
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
253 * DESCRIPTION: Walk a raw AML resource list(buffer). User function called
254 * once for each resource found.
256 ******************************************************************************/
259 acpi_ut_walk_aml_resources(u8 * aml,
260 acpi_size aml_length,
261 acpi_walk_aml_callback user_function, void **context)
269 ACPI_FUNCTION_TRACE(ut_walk_aml_resources);
271 /* The absolute minimum resource template is one end_tag descriptor */
273 if (aml_length < sizeof(struct aml_resource_end_tag)) {
274 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
277 /* Point to the end of the resource template buffer */
279 end_aml = aml + aml_length;
281 /* Walk the byte list, abort on any invalid descriptor type or length */
283 while (aml < end_aml) {
285 /* Validate the Resource Type and Resource Length */
287 status = acpi_ut_validate_resource(aml, &resource_index);
288 if (ACPI_FAILURE(status)) {
289 return_ACPI_STATUS(status);
292 /* Get the length of this descriptor */
294 length = acpi_ut_get_descriptor_length(aml);
296 /* Invoke the user function */
300 user_function(aml, length, offset, resource_index,
302 if (ACPI_FAILURE(status)) {
307 /* An end_tag descriptor terminates this resource template */
309 if (acpi_ut_get_resource_type(aml) ==
310 ACPI_RESOURCE_NAME_END_TAG) {
312 * There must be at least one more byte in the buffer for
313 * the 2nd byte of the end_tag
315 if ((aml + 1) >= end_aml) {
316 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
319 /* Return the pointer to the end_tag if requested */
321 if (!user_function) {
327 return_ACPI_STATUS(AE_OK);
334 /* Did not find an end_tag descriptor */
336 return (AE_AML_NO_RESOURCE_END_TAG);
339 /*******************************************************************************
341 * FUNCTION: acpi_ut_validate_resource
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.
347 * RETURN: Status, and optionally the Index into the global resource tables
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.
353 ******************************************************************************/
355 acpi_status acpi_ut_validate_resource(void *aml, u8 * return_index)
359 acpi_rs_length resource_length;
360 acpi_rs_length minimum_resource_length;
362 ACPI_FUNCTION_ENTRY();
365 * 1) Validate the resource_type field (Byte 0)
367 resource_type = ACPI_GET8(aml);
370 * Byte 0 contains the descriptor name (Resource Type)
371 * Examine the large/small bit in the resource header
373 if (resource_type & ACPI_RESOURCE_NAME_LARGE) {
375 /* Verify the large resource type (name) against the max */
377 if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) {
378 return (AE_AML_INVALID_RESOURCE_TYPE);
382 * Large Resource Type -- bits 6:0 contain the name
383 * Translate range 0x80-0x8B to index range 0x10-0x1B
385 resource_index = (u8) (resource_type - 0x70);
388 * Small Resource Type -- bits 6:3 contain the name
389 * Shift range to index range 0x00-0x0F
391 resource_index = (u8)
392 ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
395 /* Check validity of the resource type, zero indicates name is invalid */
397 if (!acpi_gbl_resource_types[resource_index]) {
398 return (AE_AML_INVALID_RESOURCE_TYPE);
402 * 2) Validate the resource_length field. This ensures that the length
403 * is at least reasonable, and guarantees that it is non-zero.
405 resource_length = acpi_ut_get_resource_length(aml);
406 minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index];
408 /* Validate based upon the type of resource - fixed length or variable */
410 switch (acpi_gbl_resource_types[resource_index]) {
411 case ACPI_FIXED_LENGTH:
413 /* Fixed length resource, length must match exactly */
415 if (resource_length != minimum_resource_length) {
416 return (AE_AML_BAD_RESOURCE_LENGTH);
420 case ACPI_VARIABLE_LENGTH:
422 /* Variable length resource, length must be at least the minimum */
424 if (resource_length < minimum_resource_length) {
425 return (AE_AML_BAD_RESOURCE_LENGTH);
429 case ACPI_SMALL_VARIABLE_LENGTH:
431 /* Small variable length resource, length can be (Min) or (Min-1) */
433 if ((resource_length > minimum_resource_length) ||
434 (resource_length < (minimum_resource_length - 1))) {
435 return (AE_AML_BAD_RESOURCE_LENGTH);
441 /* Shouldn't happen (because of validation earlier), but be sure */
443 return (AE_AML_INVALID_RESOURCE_TYPE);
446 /* Optionally return the resource table index */
449 *return_index = resource_index;
455 /*******************************************************************************
457 * FUNCTION: acpi_ut_get_resource_type
459 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
461 * RETURN: The Resource Type with no extraneous bits (except the
462 * Large/Small descriptor bit -- this is left alone)
464 * DESCRIPTION: Extract the Resource Type/Name from the first byte of
465 * a resource descriptor.
467 ******************************************************************************/
469 u8 acpi_ut_get_resource_type(void *aml)
471 ACPI_FUNCTION_ENTRY();
474 * Byte 0 contains the descriptor name (Resource Type)
475 * Examine the large/small bit in the resource header
477 if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
479 /* Large Resource Type -- bits 6:0 contain the name */
481 return (ACPI_GET8(aml));
483 /* Small Resource Type -- bits 6:3 contain the name */
485 return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
489 /*******************************************************************************
491 * FUNCTION: acpi_ut_get_resource_length
493 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
495 * RETURN: Byte Length
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.
501 ******************************************************************************/
503 u16 acpi_ut_get_resource_length(void *aml)
505 acpi_rs_length resource_length;
507 ACPI_FUNCTION_ENTRY();
510 * Byte 0 contains the descriptor name (Resource Type)
511 * Examine the large/small bit in the resource header
513 if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
515 /* Large Resource type -- bytes 1-2 contain the 16-bit length */
517 ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1));
520 /* Small Resource type -- bits 2:0 of byte 0 contain the length */
522 resource_length = (u16) (ACPI_GET8(aml) &
523 ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
526 return (resource_length);
529 /*******************************************************************************
531 * FUNCTION: acpi_ut_get_resource_header_length
533 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
535 * RETURN: Length of the AML header (depends on large/small descriptor)
537 * DESCRIPTION: Get the length of the header for this resource.
539 ******************************************************************************/
541 u8 acpi_ut_get_resource_header_length(void *aml)
543 ACPI_FUNCTION_ENTRY();
545 /* Examine the large/small bit in the resource header */
547 if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
548 return (sizeof(struct aml_resource_large_header));
550 return (sizeof(struct aml_resource_small_header));
554 /*******************************************************************************
556 * FUNCTION: acpi_ut_get_descriptor_length
558 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
560 * RETURN: Byte length
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.
566 ******************************************************************************/
568 u32 acpi_ut_get_descriptor_length(void *aml)
570 ACPI_FUNCTION_ENTRY();
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)
576 return (acpi_ut_get_resource_length(aml) +
577 acpi_ut_get_resource_header_length(aml));
580 /*******************************************************************************
582 * FUNCTION: acpi_ut_get_resource_end_tag
584 * PARAMETERS: obj_desc - The resource template buffer object
585 * end_tag - Where the pointer to the end_tag is returned
587 * RETURN: Status, pointer to the end tag
589 * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template
590 * Note: allows a buffer length of zero.
592 ******************************************************************************/
595 acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc,
600 ACPI_FUNCTION_TRACE(ut_get_resource_end_tag);
602 /* Allow a buffer length of zero */
604 if (!obj_desc->buffer.length) {
605 *end_tag = obj_desc->buffer.pointer;
606 return_ACPI_STATUS(AE_OK);
609 /* Validate the template and get a pointer to the end_tag */
611 status = acpi_ut_walk_aml_resources(obj_desc->buffer.pointer,
612 obj_desc->buffer.length, NULL,
615 return_ACPI_STATUS(status);