1 /******************************************************************************
2 *
3 * Module Name: utobject - ACPI object create/delete/size/cache routines
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2011, 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 "acnamesp.h"
47
48 #define _COMPONENT ACPI_UTILITIES
49 ACPI_MODULE_NAME("utobject")
50
51 /* Local prototypes */
52 static acpi_status
53 acpi_ut_get_simple_object_size(union acpi_operand_object *obj,
54 acpi_size * obj_length);
55
56 static acpi_status
57 acpi_ut_get_package_object_size(union acpi_operand_object *obj,
58 acpi_size * obj_length);
59
60 static acpi_status
61 acpi_ut_get_element_length(u8 object_type,
62 union acpi_operand_object *source_object,
63 union acpi_generic_state *state, void *context);
64
65 /*******************************************************************************
66 *
67 * FUNCTION: acpi_ut_create_internal_object_dbg
68 *
69 * PARAMETERS: module_name - Source file name of caller
70 * line_number - Line number of caller
71 * component_id - Component type of caller
72 * Type - ACPI Type of the new object
73 *
74 * RETURN: A new internal object, null on failure
75 *
76 * DESCRIPTION: Create and initialize a new internal object.
77 *
78 * NOTE: We always allocate the worst-case object descriptor because
79 * these objects are cached, and we want them to be
80 * one-size-satisifies-any-request. This in itself may not be
81 * the most memory efficient, but the efficiency of the object
82 * cache should more than make up for this!
83 *
84 ******************************************************************************/
85
acpi_ut_create_internal_object_dbg(const char * module_name,u32 line_number,u32 component_id,acpi_object_type type)86 union acpi_operand_object *acpi_ut_create_internal_object_dbg(const char
87 *module_name,
88 u32 line_number,
89 u32 component_id,
90 acpi_object_type
91 type)
92 {
93 union acpi_operand_object *object;
94 union acpi_operand_object *second_object;
95
96 ACPI_FUNCTION_TRACE_STR(ut_create_internal_object_dbg,
97 acpi_ut_get_type_name(type));
98
99 /* Allocate the raw object descriptor */
100
101 object =
102 acpi_ut_allocate_object_desc_dbg(module_name, line_number,
103 component_id);
104 if (!object) {
105 return_PTR(NULL);
106 }
107
108 switch (type) {
109 case ACPI_TYPE_REGION:
110 case ACPI_TYPE_BUFFER_FIELD:
111 case ACPI_TYPE_LOCAL_BANK_FIELD:
112
113 /* These types require a secondary object */
114
115 second_object = acpi_ut_allocate_object_desc_dbg(module_name,
116 line_number,
117 component_id);
118 if (!second_object) {
119 acpi_ut_delete_object_desc(object);
120 return_PTR(NULL);
121 }
122
123 second_object->common.type = ACPI_TYPE_LOCAL_EXTRA;
124 second_object->common.reference_count = 1;
125
126 /* Link the second object to the first */
127
128 object->common.next_object = second_object;
129 break;
130
131 default:
132 /* All others have no secondary object */
133 break;
134 }
135
136 /* Save the object type in the object descriptor */
137
138 object->common.type = (u8) type;
139
140 /* Init the reference count */
141
142 object->common.reference_count = 1;
143
144 /* Any per-type initialization should go here */
145
146 return_PTR(object);
147 }
148
149 /*******************************************************************************
150 *
151 * FUNCTION: acpi_ut_create_package_object
152 *
153 * PARAMETERS: Count - Number of package elements
154 *
155 * RETURN: Pointer to a new Package object, null on failure
156 *
157 * DESCRIPTION: Create a fully initialized package object
158 *
159 ******************************************************************************/
160
acpi_ut_create_package_object(u32 count)161 union acpi_operand_object *acpi_ut_create_package_object(u32 count)
162 {
163 union acpi_operand_object *package_desc;
164 union acpi_operand_object **package_elements;
165
166 ACPI_FUNCTION_TRACE_U32(ut_create_package_object, count);
167
168 /* Create a new Package object */
169
170 package_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
171 if (!package_desc) {
172 return_PTR(NULL);
173 }
174
175 /*
176 * Create the element array. Count+1 allows the array to be null
177 * terminated.
178 */
179 package_elements = ACPI_ALLOCATE_ZEROED(((acpi_size) count +
180 1) * sizeof(void *));
181 if (!package_elements) {
182 acpi_ut_remove_reference(package_desc);
183 return_PTR(NULL);
184 }
185
186 package_desc->package.count = count;
187 package_desc->package.elements = package_elements;
188 return_PTR(package_desc);
189 }
190
191 /*******************************************************************************
192 *
193 * FUNCTION: acpi_ut_create_integer_object
194 *
195 * PARAMETERS: initial_value - Initial value for the integer
196 *
197 * RETURN: Pointer to a new Integer object, null on failure
198 *
199 * DESCRIPTION: Create an initialized integer object
200 *
201 ******************************************************************************/
202
acpi_ut_create_integer_object(u64 initial_value)203 union acpi_operand_object *acpi_ut_create_integer_object(u64 initial_value)
204 {
205 union acpi_operand_object *integer_desc;
206
207 ACPI_FUNCTION_TRACE(ut_create_integer_object);
208
209 /* Create and initialize a new integer object */
210
211 integer_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
212 if (!integer_desc) {
213 return_PTR(NULL);
214 }
215
216 integer_desc->integer.value = initial_value;
217 return_PTR(integer_desc);
218 }
219
220 /*******************************************************************************
221 *
222 * FUNCTION: acpi_ut_create_buffer_object
223 *
224 * PARAMETERS: buffer_size - Size of buffer to be created
225 *
226 * RETURN: Pointer to a new Buffer object, null on failure
227 *
228 * DESCRIPTION: Create a fully initialized buffer object
229 *
230 ******************************************************************************/
231
acpi_ut_create_buffer_object(acpi_size buffer_size)232 union acpi_operand_object *acpi_ut_create_buffer_object(acpi_size buffer_size)
233 {
234 union acpi_operand_object *buffer_desc;
235 u8 *buffer = NULL;
236
237 ACPI_FUNCTION_TRACE_U32(ut_create_buffer_object, buffer_size);
238
239 /* Create a new Buffer object */
240
241 buffer_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
242 if (!buffer_desc) {
243 return_PTR(NULL);
244 }
245
246 /* Create an actual buffer only if size > 0 */
247
248 if (buffer_size > 0) {
249
250 /* Allocate the actual buffer */
251
252 buffer = ACPI_ALLOCATE_ZEROED(buffer_size);
253 if (!buffer) {
254 ACPI_ERROR((AE_INFO, "Could not allocate size %u",
255 (u32) buffer_size));
256 acpi_ut_remove_reference(buffer_desc);
257 return_PTR(NULL);
258 }
259 }
260
261 /* Complete buffer object initialization */
262
263 buffer_desc->buffer.flags |= AOPOBJ_DATA_VALID;
264 buffer_desc->buffer.pointer = buffer;
265 buffer_desc->buffer.length = (u32) buffer_size;
266
267 /* Return the new buffer descriptor */
268
269 return_PTR(buffer_desc);
270 }
271
272 /*******************************************************************************
273 *
274 * FUNCTION: acpi_ut_create_string_object
275 *
276 * PARAMETERS: string_size - Size of string to be created. Does not
277 * include NULL terminator, this is added
278 * automatically.
279 *
280 * RETURN: Pointer to a new String object
281 *
282 * DESCRIPTION: Create a fully initialized string object
283 *
284 ******************************************************************************/
285
acpi_ut_create_string_object(acpi_size string_size)286 union acpi_operand_object *acpi_ut_create_string_object(acpi_size string_size)
287 {
288 union acpi_operand_object *string_desc;
289 char *string;
290
291 ACPI_FUNCTION_TRACE_U32(ut_create_string_object, string_size);
292
293 /* Create a new String object */
294
295 string_desc = acpi_ut_create_internal_object(ACPI_TYPE_STRING);
296 if (!string_desc) {
297 return_PTR(NULL);
298 }
299
300 /*
301 * Allocate the actual string buffer -- (Size + 1) for NULL terminator.
302 * NOTE: Zero-length strings are NULL terminated
303 */
304 string = ACPI_ALLOCATE_ZEROED(string_size + 1);
305 if (!string) {
306 ACPI_ERROR((AE_INFO, "Could not allocate size %u",
307 (u32) string_size));
308 acpi_ut_remove_reference(string_desc);
309 return_PTR(NULL);
310 }
311
312 /* Complete string object initialization */
313
314 string_desc->string.pointer = string;
315 string_desc->string.length = (u32) string_size;
316
317 /* Return the new string descriptor */
318
319 return_PTR(string_desc);
320 }
321
322 /*******************************************************************************
323 *
324 * FUNCTION: acpi_ut_valid_internal_object
325 *
326 * PARAMETERS: Object - Object to be validated
327 *
328 * RETURN: TRUE if object is valid, FALSE otherwise
329 *
330 * DESCRIPTION: Validate a pointer to be a union acpi_operand_object
331 *
332 ******************************************************************************/
333
acpi_ut_valid_internal_object(void * object)334 u8 acpi_ut_valid_internal_object(void *object)
335 {
336
337 ACPI_FUNCTION_NAME(ut_valid_internal_object);
338
339 /* Check for a null pointer */
340
341 if (!object) {
342 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "**** Null Object Ptr\n"));
343 return (FALSE);
344 }
345
346 /* Check the descriptor type field */
347
348 switch (ACPI_GET_DESCRIPTOR_TYPE(object)) {
349 case ACPI_DESC_TYPE_OPERAND:
350
351 /* The object appears to be a valid union acpi_operand_object */
352
353 return (TRUE);
354
355 default:
356 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
357 "%p is not not an ACPI operand obj [%s]\n",
358 object, acpi_ut_get_descriptor_name(object)));
359 break;
360 }
361
362 return (FALSE);
363 }
364
365 /*******************************************************************************
366 *
367 * FUNCTION: acpi_ut_allocate_object_desc_dbg
368 *
369 * PARAMETERS: module_name - Caller's module name (for error output)
370 * line_number - Caller's line number (for error output)
371 * component_id - Caller's component ID (for error output)
372 *
373 * RETURN: Pointer to newly allocated object descriptor. Null on error
374 *
375 * DESCRIPTION: Allocate a new object descriptor. Gracefully handle
376 * error conditions.
377 *
378 ******************************************************************************/
379
acpi_ut_allocate_object_desc_dbg(const char * module_name,u32 line_number,u32 component_id)380 void *acpi_ut_allocate_object_desc_dbg(const char *module_name,
381 u32 line_number, u32 component_id)
382 {
383 union acpi_operand_object *object;
384
385 ACPI_FUNCTION_TRACE(ut_allocate_object_desc_dbg);
386
387 object = acpi_os_acquire_object(acpi_gbl_operand_cache);
388 if (!object) {
389 ACPI_ERROR((module_name, line_number,
390 "Could not allocate an object descriptor"));
391
392 return_PTR(NULL);
393 }
394
395 /* Mark the descriptor type */
396
397 memset(object, 0, sizeof(union acpi_operand_object));
398 ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_OPERAND);
399
400 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "%p Size %X\n",
401 object, (u32) sizeof(union acpi_operand_object)));
402
403 return_PTR(object);
404 }
405
406 /*******************************************************************************
407 *
408 * FUNCTION: acpi_ut_delete_object_desc
409 *
410 * PARAMETERS: Object - An Acpi internal object to be deleted
411 *
412 * RETURN: None.
413 *
414 * DESCRIPTION: Free an ACPI object descriptor or add it to the object cache
415 *
416 ******************************************************************************/
417
acpi_ut_delete_object_desc(union acpi_operand_object * object)418 void acpi_ut_delete_object_desc(union acpi_operand_object *object)
419 {
420 ACPI_FUNCTION_TRACE_PTR(ut_delete_object_desc, object);
421
422 /* Object must be a union acpi_operand_object */
423
424 if (ACPI_GET_DESCRIPTOR_TYPE(object) != ACPI_DESC_TYPE_OPERAND) {
425 ACPI_ERROR((AE_INFO,
426 "%p is not an ACPI Operand object [%s]", object,
427 acpi_ut_get_descriptor_name(object)));
428 return_VOID;
429 }
430
431 (void)acpi_os_release_object(acpi_gbl_operand_cache, object);
432 return_VOID;
433 }
434
435 /*******************************************************************************
436 *
437 * FUNCTION: acpi_ut_get_simple_object_size
438 *
439 * PARAMETERS: internal_object - An ACPI operand object
440 * obj_length - Where the length is returned
441 *
442 * RETURN: Status
443 *
444 * DESCRIPTION: This function is called to determine the space required to
445 * contain a simple object for return to an external user.
446 *
447 * The length includes the object structure plus any additional
448 * needed space.
449 *
450 ******************************************************************************/
451
452 static acpi_status
acpi_ut_get_simple_object_size(union acpi_operand_object * internal_object,acpi_size * obj_length)453 acpi_ut_get_simple_object_size(union acpi_operand_object *internal_object,
454 acpi_size * obj_length)
455 {
456 acpi_size length;
457 acpi_size size;
458 acpi_status status = AE_OK;
459
460 ACPI_FUNCTION_TRACE_PTR(ut_get_simple_object_size, internal_object);
461
462 /*
463 * Handle a null object (Could be a uninitialized package
464 * element -- which is legal)
465 */
466 if (!internal_object) {
467 *obj_length = sizeof(union acpi_object);
468 return_ACPI_STATUS(AE_OK);
469 }
470
471 /* Start with the length of the Acpi object */
472
473 length = sizeof(union acpi_object);
474
475 if (ACPI_GET_DESCRIPTOR_TYPE(internal_object) == ACPI_DESC_TYPE_NAMED) {
476
477 /* Object is a named object (reference), just return the length */
478
479 *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
480 return_ACPI_STATUS(status);
481 }
482
483 /*
484 * The final length depends on the object type
485 * Strings and Buffers are packed right up against the parent object and
486 * must be accessed bytewise or there may be alignment problems on
487 * certain processors
488 */
489 switch (internal_object->common.type) {
490 case ACPI_TYPE_STRING:
491
492 length += (acpi_size) internal_object->string.length + 1;
493 break;
494
495 case ACPI_TYPE_BUFFER:
496
497 length += (acpi_size) internal_object->buffer.length;
498 break;
499
500 case ACPI_TYPE_INTEGER:
501 case ACPI_TYPE_PROCESSOR:
502 case ACPI_TYPE_POWER:
503
504 /* No extra data for these types */
505
506 break;
507
508 case ACPI_TYPE_LOCAL_REFERENCE:
509
510 switch (internal_object->reference.class) {
511 case ACPI_REFCLASS_NAME:
512
513 /*
514 * Get the actual length of the full pathname to this object.
515 * The reference will be converted to the pathname to the object
516 */
517 size =
518 acpi_ns_get_pathname_length(internal_object->
519 reference.node);
520 if (!size) {
521 return_ACPI_STATUS(AE_BAD_PARAMETER);
522 }
523
524 length += ACPI_ROUND_UP_TO_NATIVE_WORD(size);
525 break;
526
527 default:
528
529 /*
530 * No other reference opcodes are supported.
531 * Notably, Locals and Args are not supported, but this may be
532 * required eventually.
533 */
534 ACPI_ERROR((AE_INFO,
535 "Cannot convert to external object - "
536 "unsupported Reference Class [%s] 0x%X in object %p",
537 acpi_ut_get_reference_name(internal_object),
538 internal_object->reference.class,
539 internal_object));
540 status = AE_TYPE;
541 break;
542 }
543 break;
544
545 default:
546
547 ACPI_ERROR((AE_INFO, "Cannot convert to external object - "
548 "unsupported type [%s] 0x%X in object %p",
549 acpi_ut_get_object_type_name(internal_object),
550 internal_object->common.type, internal_object));
551 status = AE_TYPE;
552 break;
553 }
554
555 /*
556 * Account for the space required by the object rounded up to the next
557 * multiple of the machine word size. This keeps each object aligned
558 * on a machine word boundary. (preventing alignment faults on some
559 * machines.)
560 */
561 *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
562 return_ACPI_STATUS(status);
563 }
564
565 /*******************************************************************************
566 *
567 * FUNCTION: acpi_ut_get_element_length
568 *
569 * PARAMETERS: acpi_pkg_callback
570 *
571 * RETURN: Status
572 *
573 * DESCRIPTION: Get the length of one package element.
574 *
575 ******************************************************************************/
576
577 static acpi_status
acpi_ut_get_element_length(u8 object_type,union acpi_operand_object * source_object,union acpi_generic_state * state,void * context)578 acpi_ut_get_element_length(u8 object_type,
579 union acpi_operand_object *source_object,
580 union acpi_generic_state *state, void *context)
581 {
582 acpi_status status = AE_OK;
583 struct acpi_pkg_info *info = (struct acpi_pkg_info *)context;
584 acpi_size object_space;
585
586 switch (object_type) {
587 case ACPI_COPY_TYPE_SIMPLE:
588
589 /*
590 * Simple object - just get the size (Null object/entry is handled
591 * here also) and sum it into the running package length
592 */
593 status =
594 acpi_ut_get_simple_object_size(source_object,
595 &object_space);
596 if (ACPI_FAILURE(status)) {
597 return (status);
598 }
599
600 info->length += object_space;
601 break;
602
603 case ACPI_COPY_TYPE_PACKAGE:
604
605 /* Package object - nothing much to do here, let the walk handle it */
606
607 info->num_packages++;
608 state->pkg.this_target_obj = NULL;
609 break;
610
611 default:
612
613 /* No other types allowed */
614
615 return (AE_BAD_PARAMETER);
616 }
617
618 return (status);
619 }
620
621 /*******************************************************************************
622 *
623 * FUNCTION: acpi_ut_get_package_object_size
624 *
625 * PARAMETERS: internal_object - An ACPI internal object
626 * obj_length - Where the length is returned
627 *
628 * RETURN: Status
629 *
630 * DESCRIPTION: This function is called to determine the space required to
631 * contain a package object for return to an external user.
632 *
633 * This is moderately complex since a package contains other
634 * objects including packages.
635 *
636 ******************************************************************************/
637
638 static acpi_status
acpi_ut_get_package_object_size(union acpi_operand_object * internal_object,acpi_size * obj_length)639 acpi_ut_get_package_object_size(union acpi_operand_object *internal_object,
640 acpi_size * obj_length)
641 {
642 acpi_status status;
643 struct acpi_pkg_info info;
644
645 ACPI_FUNCTION_TRACE_PTR(ut_get_package_object_size, internal_object);
646
647 info.length = 0;
648 info.object_space = 0;
649 info.num_packages = 1;
650
651 status = acpi_ut_walk_package_tree(internal_object, NULL,
652 acpi_ut_get_element_length, &info);
653 if (ACPI_FAILURE(status)) {
654 return_ACPI_STATUS(status);
655 }
656
657 /*
658 * We have handled all of the objects in all levels of the package.
659 * just add the length of the package objects themselves.
660 * Round up to the next machine word.
661 */
662 info.length += ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object)) *
663 (acpi_size) info.num_packages;
664
665 /* Return the total package length */
666
667 *obj_length = info.length;
668 return_ACPI_STATUS(status);
669 }
670
671 /*******************************************************************************
672 *
673 * FUNCTION: acpi_ut_get_object_size
674 *
675 * PARAMETERS: internal_object - An ACPI internal object
676 * obj_length - Where the length will be returned
677 *
678 * RETURN: Status
679 *
680 * DESCRIPTION: This function is called to determine the space required to
681 * contain an object for return to an API user.
682 *
683 ******************************************************************************/
684
685 acpi_status
acpi_ut_get_object_size(union acpi_operand_object * internal_object,acpi_size * obj_length)686 acpi_ut_get_object_size(union acpi_operand_object *internal_object,
687 acpi_size * obj_length)
688 {
689 acpi_status status;
690
691 ACPI_FUNCTION_ENTRY();
692
693 if ((ACPI_GET_DESCRIPTOR_TYPE(internal_object) ==
694 ACPI_DESC_TYPE_OPERAND)
695 && (internal_object->common.type == ACPI_TYPE_PACKAGE)) {
696 status =
697 acpi_ut_get_package_object_size(internal_object,
698 obj_length);
699 } else {
700 status =
701 acpi_ut_get_simple_object_size(internal_object, obj_length);
702 }
703
704 return (status);
705 }
706