1 /****************************************************************************** 2 * 3 * Module Name: utobject - ACPI object create/delete/size/cache routines 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2016, 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 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 = 116 acpi_ut_allocate_object_desc_dbg(module_name, 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 ******************************************************************************/ 161 162 union 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 ******************************************************************************/ 203 204 union 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 ******************************************************************************/ 232 233 union 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)); 257 258 acpi_ut_remove_reference(buffer_desc); 259 return_PTR(NULL); 260 } 261 } 262 263 /* Complete buffer object initialization */ 264 265 buffer_desc->buffer.flags |= AOPOBJ_DATA_VALID; 266 buffer_desc->buffer.pointer = buffer; 267 buffer_desc->buffer.length = (u32) buffer_size; 268 269 /* Return the new buffer descriptor */ 270 271 return_PTR(buffer_desc); 272 } 273 274 /******************************************************************************* 275 * 276 * FUNCTION: acpi_ut_create_string_object 277 * 278 * PARAMETERS: string_size - Size of string to be created. Does not 279 * include NULL terminator, this is added 280 * automatically. 281 * 282 * RETURN: Pointer to a new String object 283 * 284 * DESCRIPTION: Create a fully initialized string object 285 * 286 ******************************************************************************/ 287 288 union acpi_operand_object *acpi_ut_create_string_object(acpi_size string_size) 289 { 290 union acpi_operand_object *string_desc; 291 char *string; 292 293 ACPI_FUNCTION_TRACE_U32(ut_create_string_object, string_size); 294 295 /* Create a new String object */ 296 297 string_desc = acpi_ut_create_internal_object(ACPI_TYPE_STRING); 298 if (!string_desc) { 299 return_PTR(NULL); 300 } 301 302 /* 303 * Allocate the actual string buffer -- (Size + 1) for NULL terminator. 304 * NOTE: Zero-length strings are NULL terminated 305 */ 306 string = ACPI_ALLOCATE_ZEROED(string_size + 1); 307 if (!string) { 308 ACPI_ERROR((AE_INFO, "Could not allocate size %u", 309 (u32)string_size)); 310 311 acpi_ut_remove_reference(string_desc); 312 return_PTR(NULL); 313 } 314 315 /* Complete string object initialization */ 316 317 string_desc->string.pointer = string; 318 string_desc->string.length = (u32) string_size; 319 320 /* Return the new string descriptor */ 321 322 return_PTR(string_desc); 323 } 324 325 /******************************************************************************* 326 * 327 * FUNCTION: acpi_ut_valid_internal_object 328 * 329 * PARAMETERS: object - Object to be validated 330 * 331 * RETURN: TRUE if object is valid, FALSE otherwise 332 * 333 * DESCRIPTION: Validate a pointer to be of type union acpi_operand_object 334 * 335 ******************************************************************************/ 336 337 u8 acpi_ut_valid_internal_object(void *object) 338 { 339 340 ACPI_FUNCTION_NAME(ut_valid_internal_object); 341 342 /* Check for a null pointer */ 343 344 if (!object) { 345 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "**** Null Object Ptr\n")); 346 return (FALSE); 347 } 348 349 /* Check the descriptor type field */ 350 351 switch (ACPI_GET_DESCRIPTOR_TYPE(object)) { 352 case ACPI_DESC_TYPE_OPERAND: 353 354 /* The object appears to be a valid union acpi_operand_object */ 355 356 return (TRUE); 357 358 default: 359 360 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 361 "%p is not an ACPI operand obj [%s]\n", 362 object, acpi_ut_get_descriptor_name(object))); 363 break; 364 } 365 366 return (FALSE); 367 } 368 369 /******************************************************************************* 370 * 371 * FUNCTION: acpi_ut_allocate_object_desc_dbg 372 * 373 * PARAMETERS: module_name - Caller's module name (for error output) 374 * line_number - Caller's line number (for error output) 375 * component_id - Caller's component ID (for error output) 376 * 377 * RETURN: Pointer to newly allocated object descriptor. Null on error 378 * 379 * DESCRIPTION: Allocate a new object descriptor. Gracefully handle 380 * error conditions. 381 * 382 ******************************************************************************/ 383 384 void *acpi_ut_allocate_object_desc_dbg(const char *module_name, 385 u32 line_number, u32 component_id) 386 { 387 union acpi_operand_object *object; 388 389 ACPI_FUNCTION_TRACE(ut_allocate_object_desc_dbg); 390 391 object = acpi_os_acquire_object(acpi_gbl_operand_cache); 392 if (!object) { 393 ACPI_ERROR((module_name, line_number, 394 "Could not allocate an object descriptor")); 395 396 return_PTR(NULL); 397 } 398 399 /* Mark the descriptor type */ 400 401 ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_OPERAND); 402 403 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "%p Size %X\n", 404 object, (u32) sizeof(union acpi_operand_object))); 405 406 return_PTR(object); 407 } 408 409 /******************************************************************************* 410 * 411 * FUNCTION: acpi_ut_delete_object_desc 412 * 413 * PARAMETERS: object - An Acpi internal object to be deleted 414 * 415 * RETURN: None. 416 * 417 * DESCRIPTION: Free an ACPI object descriptor or add it to the object cache 418 * 419 ******************************************************************************/ 420 421 void acpi_ut_delete_object_desc(union acpi_operand_object *object) 422 { 423 ACPI_FUNCTION_TRACE_PTR(ut_delete_object_desc, object); 424 425 /* Object must be of type union acpi_operand_object */ 426 427 if (ACPI_GET_DESCRIPTOR_TYPE(object) != ACPI_DESC_TYPE_OPERAND) { 428 ACPI_ERROR((AE_INFO, 429 "%p is not an ACPI Operand object [%s]", object, 430 acpi_ut_get_descriptor_name(object))); 431 return_VOID; 432 } 433 434 (void)acpi_os_release_object(acpi_gbl_operand_cache, object); 435 return_VOID; 436 } 437 438 /******************************************************************************* 439 * 440 * FUNCTION: acpi_ut_get_simple_object_size 441 * 442 * PARAMETERS: internal_object - An ACPI operand object 443 * obj_length - Where the length is returned 444 * 445 * RETURN: Status 446 * 447 * DESCRIPTION: This function is called to determine the space required to 448 * contain a simple object for return to an external user. 449 * 450 * The length includes the object structure plus any additional 451 * needed space. 452 * 453 ******************************************************************************/ 454 455 static acpi_status 456 acpi_ut_get_simple_object_size(union acpi_operand_object *internal_object, 457 acpi_size *obj_length) 458 { 459 acpi_size length; 460 acpi_size size; 461 acpi_status status = AE_OK; 462 463 ACPI_FUNCTION_TRACE_PTR(ut_get_simple_object_size, internal_object); 464 465 /* Start with the length of the (external) Acpi object */ 466 467 length = sizeof(union acpi_object); 468 469 /* A NULL object is allowed, can be a legal uninitialized package element */ 470 471 if (!internal_object) { 472 /* 473 * Object is NULL, just return the length of union acpi_object 474 * (A NULL union acpi_object is an object of all zeroes.) 475 */ 476 *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length); 477 return_ACPI_STATUS(AE_OK); 478 } 479 480 /* A Namespace Node should never appear here */ 481 482 if (ACPI_GET_DESCRIPTOR_TYPE(internal_object) == ACPI_DESC_TYPE_NAMED) { 483 484 /* A namespace node should never get here */ 485 486 return_ACPI_STATUS(AE_AML_INTERNAL); 487 } 488 489 /* 490 * The final length depends on the object type 491 * Strings and Buffers are packed right up against the parent object and 492 * must be accessed bytewise or there may be alignment problems on 493 * certain processors 494 */ 495 switch (internal_object->common.type) { 496 case ACPI_TYPE_STRING: 497 498 length += (acpi_size)internal_object->string.length + 1; 499 break; 500 501 case ACPI_TYPE_BUFFER: 502 503 length += (acpi_size)internal_object->buffer.length; 504 break; 505 506 case ACPI_TYPE_INTEGER: 507 case ACPI_TYPE_PROCESSOR: 508 case ACPI_TYPE_POWER: 509 510 /* No extra data for these types */ 511 512 break; 513 514 case ACPI_TYPE_LOCAL_REFERENCE: 515 516 switch (internal_object->reference.class) { 517 case ACPI_REFCLASS_NAME: 518 /* 519 * Get the actual length of the full pathname to this object. 520 * The reference will be converted to the pathname to the object 521 */ 522 size = 523 acpi_ns_get_pathname_length(internal_object-> 524 reference.node); 525 if (!size) { 526 return_ACPI_STATUS(AE_BAD_PARAMETER); 527 } 528 529 length += ACPI_ROUND_UP_TO_NATIVE_WORD(size); 530 break; 531 532 default: 533 /* 534 * No other reference opcodes are supported. 535 * Notably, Locals and Args are not supported, but this may be 536 * required eventually. 537 */ 538 ACPI_ERROR((AE_INFO, 539 "Cannot convert to external object - " 540 "unsupported Reference Class [%s] 0x%X in object %p", 541 acpi_ut_get_reference_name(internal_object), 542 internal_object->reference.class, 543 internal_object)); 544 status = AE_TYPE; 545 break; 546 } 547 break; 548 549 default: 550 551 ACPI_ERROR((AE_INFO, "Cannot convert to external object - " 552 "unsupported type [%s] 0x%X in object %p", 553 acpi_ut_get_object_type_name(internal_object), 554 internal_object->common.type, internal_object)); 555 status = AE_TYPE; 556 break; 557 } 558 559 /* 560 * Account for the space required by the object rounded up to the next 561 * multiple of the machine word size. This keeps each object aligned 562 * on a machine word boundary. (preventing alignment faults on some 563 * machines.) 564 */ 565 *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length); 566 return_ACPI_STATUS(status); 567 } 568 569 /******************************************************************************* 570 * 571 * FUNCTION: acpi_ut_get_element_length 572 * 573 * PARAMETERS: acpi_pkg_callback 574 * 575 * RETURN: Status 576 * 577 * DESCRIPTION: Get the length of one package element. 578 * 579 ******************************************************************************/ 580 581 static acpi_status 582 acpi_ut_get_element_length(u8 object_type, 583 union acpi_operand_object *source_object, 584 union acpi_generic_state *state, void *context) 585 { 586 acpi_status status = AE_OK; 587 struct acpi_pkg_info *info = (struct acpi_pkg_info *)context; 588 acpi_size object_space; 589 590 switch (object_type) { 591 case ACPI_COPY_TYPE_SIMPLE: 592 /* 593 * Simple object - just get the size (Null object/entry is handled 594 * here also) and sum it into the running package length 595 */ 596 status = 597 acpi_ut_get_simple_object_size(source_object, 598 &object_space); 599 if (ACPI_FAILURE(status)) { 600 return (status); 601 } 602 603 info->length += object_space; 604 break; 605 606 case ACPI_COPY_TYPE_PACKAGE: 607 608 /* Package object - nothing much to do here, let the walk handle it */ 609 610 info->num_packages++; 611 state->pkg.this_target_obj = NULL; 612 break; 613 614 default: 615 616 /* No other types allowed */ 617 618 return (AE_BAD_PARAMETER); 619 } 620 621 return (status); 622 } 623 624 /******************************************************************************* 625 * 626 * FUNCTION: acpi_ut_get_package_object_size 627 * 628 * PARAMETERS: internal_object - An ACPI internal object 629 * obj_length - Where the length is returned 630 * 631 * RETURN: Status 632 * 633 * DESCRIPTION: This function is called to determine the space required to 634 * contain a package object for return to an external user. 635 * 636 * This is moderately complex since a package contains other 637 * objects including packages. 638 * 639 ******************************************************************************/ 640 641 static acpi_status 642 acpi_ut_get_package_object_size(union acpi_operand_object *internal_object, 643 acpi_size *obj_length) 644 { 645 acpi_status status; 646 struct acpi_pkg_info info; 647 648 ACPI_FUNCTION_TRACE_PTR(ut_get_package_object_size, internal_object); 649 650 info.length = 0; 651 info.object_space = 0; 652 info.num_packages = 1; 653 654 status = 655 acpi_ut_walk_package_tree(internal_object, NULL, 656 acpi_ut_get_element_length, &info); 657 if (ACPI_FAILURE(status)) { 658 return_ACPI_STATUS(status); 659 } 660 661 /* 662 * We have handled all of the objects in all levels of the package. 663 * just add the length of the package objects themselves. 664 * Round up to the next machine word. 665 */ 666 info.length += 667 ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object)) * 668 (acpi_size)info.num_packages; 669 670 /* Return the total package length */ 671 672 *obj_length = info.length; 673 return_ACPI_STATUS(status); 674 } 675 676 /******************************************************************************* 677 * 678 * FUNCTION: acpi_ut_get_object_size 679 * 680 * PARAMETERS: internal_object - An ACPI internal object 681 * obj_length - Where the length will be returned 682 * 683 * RETURN: Status 684 * 685 * DESCRIPTION: This function is called to determine the space required to 686 * contain an object for return to an API user. 687 * 688 ******************************************************************************/ 689 690 acpi_status 691 acpi_ut_get_object_size(union acpi_operand_object *internal_object, 692 acpi_size *obj_length) 693 { 694 acpi_status status; 695 696 ACPI_FUNCTION_ENTRY(); 697 698 if ((ACPI_GET_DESCRIPTOR_TYPE(internal_object) == 699 ACPI_DESC_TYPE_OPERAND) && 700 (internal_object->common.type == ACPI_TYPE_PACKAGE)) { 701 status = 702 acpi_ut_get_package_object_size(internal_object, 703 obj_length); 704 } else { 705 status = 706 acpi_ut_get_simple_object_size(internal_object, obj_length); 707 } 708 709 return (status); 710 } 711