1/****************************************************************************** 2 * 3 * Module Name: utobject - ACPI object create/delete/size/cache routines 4 * 5 *****************************************************************************/ 6 7/* 8 * Copyright (C) 2000 - 2014, 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 49ACPI_MODULE_NAME("utobject") 50 51/* Local prototypes */ 52static acpi_status 53acpi_ut_get_simple_object_size(union acpi_operand_object *obj, 54 acpi_size * obj_length); 55 56static acpi_status 57acpi_ut_get_package_object_size(union acpi_operand_object *obj, 58 acpi_size * obj_length); 59 60static acpi_status 61acpi_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 86union 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: 132 133 /* All others have no secondary object */ 134 break; 135 } 136 137 /* Save the object type in the object descriptor */ 138 139 object->common.type = (u8) type; 140 141 /* Init the reference count */ 142 143 object->common.reference_count = 1; 144 145 /* Any per-type initialization should go here */ 146 147 return_PTR(object); 148} 149 150/******************************************************************************* 151 * 152 * FUNCTION: acpi_ut_create_package_object 153 * 154 * PARAMETERS: count - Number of package elements 155 * 156 * RETURN: Pointer to a new Package object, null on failure 157 * 158 * DESCRIPTION: Create a fully initialized package object 159 * 160 ******************************************************************************/ 161 162union acpi_operand_object *acpi_ut_create_package_object(u32 count) 163{ 164 union acpi_operand_object *package_desc; 165 union acpi_operand_object **package_elements; 166 167 ACPI_FUNCTION_TRACE_U32(ut_create_package_object, count); 168 169 /* Create a new Package object */ 170 171 package_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE); 172 if (!package_desc) { 173 return_PTR(NULL); 174 } 175 176 /* 177 * Create the element array. Count+1 allows the array to be null 178 * terminated. 179 */ 180 package_elements = ACPI_ALLOCATE_ZEROED(((acpi_size) count + 181 1) * sizeof(void *)); 182 if (!package_elements) { 183 ACPI_FREE(package_desc); 184 return_PTR(NULL); 185 } 186 187 package_desc->package.count = count; 188 package_desc->package.elements = package_elements; 189 return_PTR(package_desc); 190} 191 192/******************************************************************************* 193 * 194 * FUNCTION: acpi_ut_create_integer_object 195 * 196 * PARAMETERS: initial_value - Initial value for the integer 197 * 198 * RETURN: Pointer to a new Integer object, null on failure 199 * 200 * DESCRIPTION: Create an initialized integer object 201 * 202 ******************************************************************************/ 203 204union acpi_operand_object *acpi_ut_create_integer_object(u64 initial_value) 205{ 206 union acpi_operand_object *integer_desc; 207 208 ACPI_FUNCTION_TRACE(ut_create_integer_object); 209 210 /* Create and initialize a new integer object */ 211 212 integer_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER); 213 if (!integer_desc) { 214 return_PTR(NULL); 215 } 216 217 integer_desc->integer.value = initial_value; 218 return_PTR(integer_desc); 219} 220 221/******************************************************************************* 222 * 223 * FUNCTION: acpi_ut_create_buffer_object 224 * 225 * PARAMETERS: buffer_size - Size of buffer to be created 226 * 227 * RETURN: Pointer to a new Buffer object, null on failure 228 * 229 * DESCRIPTION: Create a fully initialized buffer object 230 * 231 ******************************************************************************/ 232 233union acpi_operand_object *acpi_ut_create_buffer_object(acpi_size buffer_size) 234{ 235 union acpi_operand_object *buffer_desc; 236 u8 *buffer = NULL; 237 238 ACPI_FUNCTION_TRACE_U32(ut_create_buffer_object, buffer_size); 239 240 /* Create a new Buffer object */ 241 242 buffer_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER); 243 if (!buffer_desc) { 244 return_PTR(NULL); 245 } 246 247 /* Create an actual buffer only if size > 0 */ 248 249 if (buffer_size > 0) { 250 251 /* Allocate the actual buffer */ 252 253 buffer = ACPI_ALLOCATE_ZEROED(buffer_size); 254 if (!buffer) { 255 ACPI_ERROR((AE_INFO, "Could not allocate size %u", 256 (u32) buffer_size)); 257 acpi_ut_remove_reference(buffer_desc); 258 return_PTR(NULL); 259 } 260 } 261 262 /* Complete buffer object initialization */ 263 264 buffer_desc->buffer.flags |= AOPOBJ_DATA_VALID; 265 buffer_desc->buffer.pointer = buffer; 266 buffer_desc->buffer.length = (u32) buffer_size; 267 268 /* Return the new buffer descriptor */ 269 270 return_PTR(buffer_desc); 271} 272 273/******************************************************************************* 274 * 275 * FUNCTION: acpi_ut_create_string_object 276 * 277 * PARAMETERS: string_size - Size of string to be created. Does not 278 * include NULL terminator, this is added 279 * automatically. 280 * 281 * RETURN: Pointer to a new String object 282 * 283 * DESCRIPTION: Create a fully initialized string object 284 * 285 ******************************************************************************/ 286 287union acpi_operand_object *acpi_ut_create_string_object(acpi_size string_size) 288{ 289 union acpi_operand_object *string_desc; 290 char *string; 291 292 ACPI_FUNCTION_TRACE_U32(ut_create_string_object, string_size); 293 294 /* Create a new String object */ 295 296 string_desc = acpi_ut_create_internal_object(ACPI_TYPE_STRING); 297 if (!string_desc) { 298 return_PTR(NULL); 299 } 300 301 /* 302 * Allocate the actual string buffer -- (Size + 1) for NULL terminator. 303 * NOTE: Zero-length strings are NULL terminated 304 */ 305 string = ACPI_ALLOCATE_ZEROED(string_size + 1); 306 if (!string) { 307 ACPI_ERROR((AE_INFO, "Could not allocate size %u", 308 (u32) string_size)); 309 acpi_ut_remove_reference(string_desc); 310 return_PTR(NULL); 311 } 312 313 /* Complete string object initialization */ 314 315 string_desc->string.pointer = string; 316 string_desc->string.length = (u32) string_size; 317 318 /* Return the new string descriptor */ 319 320 return_PTR(string_desc); 321} 322 323/******************************************************************************* 324 * 325 * FUNCTION: acpi_ut_valid_internal_object 326 * 327 * PARAMETERS: object - Object to be validated 328 * 329 * RETURN: TRUE if object is valid, FALSE otherwise 330 * 331 * DESCRIPTION: Validate a pointer to be of type union acpi_operand_object 332 * 333 ******************************************************************************/ 334 335u8 acpi_ut_valid_internal_object(void *object) 336{ 337 338 ACPI_FUNCTION_NAME(ut_valid_internal_object); 339 340 /* Check for a null pointer */ 341 342 if (!object) { 343 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "**** Null Object Ptr\n")); 344 return (FALSE); 345 } 346 347 /* Check the descriptor type field */ 348 349 switch (ACPI_GET_DESCRIPTOR_TYPE(object)) { 350 case ACPI_DESC_TYPE_OPERAND: 351 352 /* The object appears to be a valid union acpi_operand_object */ 353 354 return (TRUE); 355 356 default: 357 358 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 359 "%p is not an ACPI operand obj [%s]\n", 360 object, acpi_ut_get_descriptor_name(object))); 361 break; 362 } 363 364 return (FALSE); 365} 366 367/******************************************************************************* 368 * 369 * FUNCTION: acpi_ut_allocate_object_desc_dbg 370 * 371 * PARAMETERS: module_name - Caller's module name (for error output) 372 * line_number - Caller's line number (for error output) 373 * component_id - Caller's component ID (for error output) 374 * 375 * RETURN: Pointer to newly allocated object descriptor. Null on error 376 * 377 * DESCRIPTION: Allocate a new object descriptor. Gracefully handle 378 * error conditions. 379 * 380 ******************************************************************************/ 381 382void *acpi_ut_allocate_object_desc_dbg(const char *module_name, 383 u32 line_number, u32 component_id) 384{ 385 union acpi_operand_object *object; 386 387 ACPI_FUNCTION_TRACE(ut_allocate_object_desc_dbg); 388 389 object = acpi_os_acquire_object(acpi_gbl_operand_cache); 390 if (!object) { 391 ACPI_ERROR((module_name, line_number, 392 "Could not allocate an object descriptor")); 393 394 return_PTR(NULL); 395 } 396 397 /* Mark the descriptor type */ 398 399 ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_OPERAND); 400 401 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "%p Size %X\n", 402 object, (u32) sizeof(union acpi_operand_object))); 403 404 return_PTR(object); 405} 406 407/******************************************************************************* 408 * 409 * FUNCTION: acpi_ut_delete_object_desc 410 * 411 * PARAMETERS: object - An Acpi internal object to be deleted 412 * 413 * RETURN: None. 414 * 415 * DESCRIPTION: Free an ACPI object descriptor or add it to the object cache 416 * 417 ******************************************************************************/ 418 419void acpi_ut_delete_object_desc(union acpi_operand_object *object) 420{ 421 ACPI_FUNCTION_TRACE_PTR(ut_delete_object_desc, object); 422 423 /* Object must be of type union acpi_operand_object */ 424 425 if (ACPI_GET_DESCRIPTOR_TYPE(object) != ACPI_DESC_TYPE_OPERAND) { 426 ACPI_ERROR((AE_INFO, 427 "%p is not an ACPI Operand object [%s]", object, 428 acpi_ut_get_descriptor_name(object))); 429 return_VOID; 430 } 431 432 (void)acpi_os_release_object(acpi_gbl_operand_cache, object); 433 return_VOID; 434} 435 436/******************************************************************************* 437 * 438 * FUNCTION: acpi_ut_get_simple_object_size 439 * 440 * PARAMETERS: internal_object - An ACPI operand object 441 * obj_length - Where the length is returned 442 * 443 * RETURN: Status 444 * 445 * DESCRIPTION: This function is called to determine the space required to 446 * contain a simple object for return to an external user. 447 * 448 * The length includes the object structure plus any additional 449 * needed space. 450 * 451 ******************************************************************************/ 452 453static acpi_status 454acpi_ut_get_simple_object_size(union acpi_operand_object *internal_object, 455 acpi_size * obj_length) 456{ 457 acpi_size length; 458 acpi_size size; 459 acpi_status status = AE_OK; 460 461 ACPI_FUNCTION_TRACE_PTR(ut_get_simple_object_size, internal_object); 462 463 /* Start with the length of the (external) Acpi object */ 464 465 length = sizeof(union acpi_object); 466 467 /* A NULL object is allowed, can be a legal uninitialized package element */ 468 469 if (!internal_object) { 470 /* 471 * Object is NULL, just return the length of union acpi_object 472 * (A NULL union acpi_object is an object of all zeroes.) 473 */ 474 *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length); 475 return_ACPI_STATUS(AE_OK); 476 } 477 478 /* A Namespace Node should never appear here */ 479 480 if (ACPI_GET_DESCRIPTOR_TYPE(internal_object) == ACPI_DESC_TYPE_NAMED) { 481 482 /* A namespace node should never get here */ 483 484 return_ACPI_STATUS(AE_AML_INTERNAL); 485 } 486 487 /* 488 * The final length depends on the object type 489 * Strings and Buffers are packed right up against the parent object and 490 * must be accessed bytewise or there may be alignment problems on 491 * certain processors 492 */ 493 switch (internal_object->common.type) { 494 case ACPI_TYPE_STRING: 495 496 length += (acpi_size) internal_object->string.length + 1; 497 break; 498 499 case ACPI_TYPE_BUFFER: 500 501 length += (acpi_size) internal_object->buffer.length; 502 break; 503 504 case ACPI_TYPE_INTEGER: 505 case ACPI_TYPE_PROCESSOR: 506 case ACPI_TYPE_POWER: 507 508 /* No extra data for these types */ 509 510 break; 511 512 case ACPI_TYPE_LOCAL_REFERENCE: 513 514 switch (internal_object->reference.class) { 515 case ACPI_REFCLASS_NAME: 516 /* 517 * Get the actual length of the full pathname to this object. 518 * The reference will be converted to the pathname to the object 519 */ 520 size = 521 acpi_ns_get_pathname_length(internal_object-> 522 reference.node); 523 if (!size) { 524 return_ACPI_STATUS(AE_BAD_PARAMETER); 525 } 526 527 length += ACPI_ROUND_UP_TO_NATIVE_WORD(size); 528 break; 529 530 default: 531 /* 532 * No other reference opcodes are supported. 533 * Notably, Locals and Args are not supported, but this may be 534 * required eventually. 535 */ 536 ACPI_ERROR((AE_INFO, 537 "Cannot convert to external object - " 538 "unsupported Reference Class [%s] 0x%X in object %p", 539 acpi_ut_get_reference_name(internal_object), 540 internal_object->reference.class, 541 internal_object)); 542 status = AE_TYPE; 543 break; 544 } 545 break; 546 547 default: 548 549 ACPI_ERROR((AE_INFO, "Cannot convert to external object - " 550 "unsupported type [%s] 0x%X in object %p", 551 acpi_ut_get_object_type_name(internal_object), 552 internal_object->common.type, internal_object)); 553 status = AE_TYPE; 554 break; 555 } 556 557 /* 558 * Account for the space required by the object rounded up to the next 559 * multiple of the machine word size. This keeps each object aligned 560 * on a machine word boundary. (preventing alignment faults on some 561 * machines.) 562 */ 563 *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length); 564 return_ACPI_STATUS(status); 565} 566 567/******************************************************************************* 568 * 569 * FUNCTION: acpi_ut_get_element_length 570 * 571 * PARAMETERS: acpi_pkg_callback 572 * 573 * RETURN: Status 574 * 575 * DESCRIPTION: Get the length of one package element. 576 * 577 ******************************************************************************/ 578 579static acpi_status 580acpi_ut_get_element_length(u8 object_type, 581 union acpi_operand_object *source_object, 582 union acpi_generic_state *state, void *context) 583{ 584 acpi_status status = AE_OK; 585 struct acpi_pkg_info *info = (struct acpi_pkg_info *)context; 586 acpi_size object_space; 587 588 switch (object_type) { 589 case ACPI_COPY_TYPE_SIMPLE: 590 /* 591 * Simple object - just get the size (Null object/entry is handled 592 * here also) and sum it into the running package length 593 */ 594 status = 595 acpi_ut_get_simple_object_size(source_object, 596 &object_space); 597 if (ACPI_FAILURE(status)) { 598 return (status); 599 } 600 601 info->length += object_space; 602 break; 603 604 case ACPI_COPY_TYPE_PACKAGE: 605 606 /* Package object - nothing much to do here, let the walk handle it */ 607 608 info->num_packages++; 609 state->pkg.this_target_obj = NULL; 610 break; 611 612 default: 613 614 /* No other types allowed */ 615 616 return (AE_BAD_PARAMETER); 617 } 618 619 return (status); 620} 621 622/******************************************************************************* 623 * 624 * FUNCTION: acpi_ut_get_package_object_size 625 * 626 * PARAMETERS: internal_object - An ACPI internal object 627 * obj_length - Where the length is returned 628 * 629 * RETURN: Status 630 * 631 * DESCRIPTION: This function is called to determine the space required to 632 * contain a package object for return to an external user. 633 * 634 * This is moderately complex since a package contains other 635 * objects including packages. 636 * 637 ******************************************************************************/ 638 639static acpi_status 640acpi_ut_get_package_object_size(union acpi_operand_object *internal_object, 641 acpi_size * obj_length) 642{ 643 acpi_status status; 644 struct acpi_pkg_info info; 645 646 ACPI_FUNCTION_TRACE_PTR(ut_get_package_object_size, internal_object); 647 648 info.length = 0; 649 info.object_space = 0; 650 info.num_packages = 1; 651 652 status = acpi_ut_walk_package_tree(internal_object, NULL, 653 acpi_ut_get_element_length, &info); 654 if (ACPI_FAILURE(status)) { 655 return_ACPI_STATUS(status); 656 } 657 658 /* 659 * We have handled all of the objects in all levels of the package. 660 * just add the length of the package objects themselves. 661 * Round up to the next machine word. 662 */ 663 info.length += ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object)) * 664 (acpi_size) info.num_packages; 665 666 /* Return the total package length */ 667 668 *obj_length = info.length; 669 return_ACPI_STATUS(status); 670} 671 672/******************************************************************************* 673 * 674 * FUNCTION: acpi_ut_get_object_size 675 * 676 * PARAMETERS: internal_object - An ACPI internal object 677 * obj_length - Where the length will be returned 678 * 679 * RETURN: Status 680 * 681 * DESCRIPTION: This function is called to determine the space required to 682 * contain an object for return to an API user. 683 * 684 ******************************************************************************/ 685 686acpi_status 687acpi_ut_get_object_size(union acpi_operand_object *internal_object, 688 acpi_size * obj_length) 689{ 690 acpi_status status; 691 692 ACPI_FUNCTION_ENTRY(); 693 694 if ((ACPI_GET_DESCRIPTOR_TYPE(internal_object) == 695 ACPI_DESC_TYPE_OPERAND) 696 && (internal_object->common.type == ACPI_TYPE_PACKAGE)) { 697 status = 698 acpi_ut_get_package_object_size(internal_object, 699 obj_length); 700 } else { 701 status = 702 acpi_ut_get_simple_object_size(internal_object, obj_length); 703 } 704 705 return (status); 706} 707