1/******************************************************************************* 2 * 3 * Module Name: utresrc - Resource management utilities 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 "acresrc.h" 47 48#define _COMPONENT ACPI_UTILITIES 49ACPI_MODULE_NAME("utresrc") 50 51#if defined(ACPI_DEBUG_OUTPUT) || defined (ACPI_DISASSEMBLER) || defined (ACPI_DEBUGGER) 52/* 53 * Strings used to decode resource descriptors. 54 * Used by both the disassembler and the debugger resource dump routines 55 */ 56const char *acpi_gbl_bm_decode[] = { 57 "NotBusMaster", 58 "BusMaster" 59}; 60 61const char *acpi_gbl_config_decode[] = { 62 "0 - Good Configuration", 63 "1 - Acceptable Configuration", 64 "2 - Suboptimal Configuration", 65 "3 - ***Invalid Configuration***", 66}; 67 68const char *acpi_gbl_consume_decode[] = { 69 "ResourceProducer", 70 "ResourceConsumer" 71}; 72 73const char *acpi_gbl_dec_decode[] = { 74 "PosDecode", 75 "SubDecode" 76}; 77 78const char *acpi_gbl_he_decode[] = { 79 "Level", 80 "Edge" 81}; 82 83const char *acpi_gbl_io_decode[] = { 84 "Decode10", 85 "Decode16" 86}; 87 88const char *acpi_gbl_ll_decode[] = { 89 "ActiveHigh", 90 "ActiveLow", 91 "ActiveBoth", 92 "Reserved" 93}; 94 95const char *acpi_gbl_max_decode[] = { 96 "MaxNotFixed", 97 "MaxFixed" 98}; 99 100const char *acpi_gbl_mem_decode[] = { 101 "NonCacheable", 102 "Cacheable", 103 "WriteCombining", 104 "Prefetchable" 105}; 106 107const char *acpi_gbl_min_decode[] = { 108 "MinNotFixed", 109 "MinFixed" 110}; 111 112const char *acpi_gbl_mtp_decode[] = { 113 "AddressRangeMemory", 114 "AddressRangeReserved", 115 "AddressRangeACPI", 116 "AddressRangeNVS" 117}; 118 119const char *acpi_gbl_rng_decode[] = { 120 "InvalidRanges", 121 "NonISAOnlyRanges", 122 "ISAOnlyRanges", 123 "EntireRange" 124}; 125 126const char *acpi_gbl_rw_decode[] = { 127 "ReadOnly", 128 "ReadWrite" 129}; 130 131const char *acpi_gbl_shr_decode[] = { 132 "Exclusive", 133 "Shared", 134 "ExclusiveAndWake", /* ACPI 5.0 */ 135 "SharedAndWake" /* ACPI 5.0 */ 136}; 137 138const char *acpi_gbl_siz_decode[] = { 139 "Transfer8", 140 "Transfer8_16", 141 "Transfer16", 142 "InvalidSize" 143}; 144 145const char *acpi_gbl_trs_decode[] = { 146 "DenseTranslation", 147 "SparseTranslation" 148}; 149 150const char *acpi_gbl_ttp_decode[] = { 151 "TypeStatic", 152 "TypeTranslation" 153}; 154 155const char *acpi_gbl_typ_decode[] = { 156 "Compatibility", 157 "TypeA", 158 "TypeB", 159 "TypeF" 160}; 161 162const char *acpi_gbl_ppc_decode[] = { 163 "PullDefault", 164 "PullUp", 165 "PullDown", 166 "PullNone" 167}; 168 169const char *acpi_gbl_ior_decode[] = { 170 "IoRestrictionNone", 171 "IoRestrictionInputOnly", 172 "IoRestrictionOutputOnly", 173 "IoRestrictionNoneAndPreserve" 174}; 175 176const char *acpi_gbl_dts_decode[] = { 177 "Width8bit", 178 "Width16bit", 179 "Width32bit", 180 "Width64bit", 181 "Width128bit", 182 "Width256bit", 183}; 184 185/* GPIO connection type */ 186 187const char *acpi_gbl_ct_decode[] = { 188 "Interrupt", 189 "I/O" 190}; 191 192/* Serial bus type */ 193 194const char *acpi_gbl_sbt_decode[] = { 195 "/* UNKNOWN serial bus type */", 196 "I2C", 197 "SPI", 198 "UART" 199}; 200 201/* I2C serial bus access mode */ 202 203const char *acpi_gbl_am_decode[] = { 204 "AddressingMode7Bit", 205 "AddressingMode10Bit" 206}; 207 208/* I2C serial bus slave mode */ 209 210const char *acpi_gbl_sm_decode[] = { 211 "ControllerInitiated", 212 "DeviceInitiated" 213}; 214 215/* SPI serial bus wire mode */ 216 217const char *acpi_gbl_wm_decode[] = { 218 "FourWireMode", 219 "ThreeWireMode" 220}; 221 222/* SPI serial clock phase */ 223 224const char *acpi_gbl_cph_decode[] = { 225 "ClockPhaseFirst", 226 "ClockPhaseSecond" 227}; 228 229/* SPI serial bus clock polarity */ 230 231const char *acpi_gbl_cpo_decode[] = { 232 "ClockPolarityLow", 233 "ClockPolarityHigh" 234}; 235 236/* SPI serial bus device polarity */ 237 238const char *acpi_gbl_dp_decode[] = { 239 "PolarityLow", 240 "PolarityHigh" 241}; 242 243/* UART serial bus endian */ 244 245const char *acpi_gbl_ed_decode[] = { 246 "LittleEndian", 247 "BigEndian" 248}; 249 250/* UART serial bus bits per byte */ 251 252const char *acpi_gbl_bpb_decode[] = { 253 "DataBitsFive", 254 "DataBitsSix", 255 "DataBitsSeven", 256 "DataBitsEight", 257 "DataBitsNine", 258 "/* UNKNOWN Bits per byte */", 259 "/* UNKNOWN Bits per byte */", 260 "/* UNKNOWN Bits per byte */" 261}; 262 263/* UART serial bus stop bits */ 264 265const char *acpi_gbl_sb_decode[] = { 266 "StopBitsNone", 267 "StopBitsOne", 268 "StopBitsOnePlusHalf", 269 "StopBitsTwo" 270}; 271 272/* UART serial bus flow control */ 273 274const char *acpi_gbl_fc_decode[] = { 275 "FlowControlNone", 276 "FlowControlHardware", 277 "FlowControlXON", 278 "/* UNKNOWN flow control keyword */" 279}; 280 281/* UART serial bus parity type */ 282 283const char *acpi_gbl_pt_decode[] = { 284 "ParityTypeNone", 285 "ParityTypeEven", 286 "ParityTypeOdd", 287 "ParityTypeMark", 288 "ParityTypeSpace", 289 "/* UNKNOWN parity keyword */", 290 "/* UNKNOWN parity keyword */", 291 "/* UNKNOWN parity keyword */" 292}; 293 294#endif 295 296/* 297 * Base sizes of the raw AML resource descriptors, indexed by resource type. 298 * Zero indicates a reserved (and therefore invalid) resource type. 299 */ 300const u8 acpi_gbl_resource_aml_sizes[] = { 301 /* Small descriptors */ 302 303 0, 304 0, 305 0, 306 0, 307 ACPI_AML_SIZE_SMALL(struct aml_resource_irq), 308 ACPI_AML_SIZE_SMALL(struct aml_resource_dma), 309 ACPI_AML_SIZE_SMALL(struct aml_resource_start_dependent), 310 ACPI_AML_SIZE_SMALL(struct aml_resource_end_dependent), 311 ACPI_AML_SIZE_SMALL(struct aml_resource_io), 312 ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_io), 313 ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_dma), 314 0, 315 0, 316 0, 317 ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small), 318 ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag), 319 320 /* Large descriptors */ 321 322 0, 323 ACPI_AML_SIZE_LARGE(struct aml_resource_memory24), 324 ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register), 325 0, 326 ACPI_AML_SIZE_LARGE(struct aml_resource_vendor_large), 327 ACPI_AML_SIZE_LARGE(struct aml_resource_memory32), 328 ACPI_AML_SIZE_LARGE(struct aml_resource_fixed_memory32), 329 ACPI_AML_SIZE_LARGE(struct aml_resource_address32), 330 ACPI_AML_SIZE_LARGE(struct aml_resource_address16), 331 ACPI_AML_SIZE_LARGE(struct aml_resource_extended_irq), 332 ACPI_AML_SIZE_LARGE(struct aml_resource_address64), 333 ACPI_AML_SIZE_LARGE(struct aml_resource_extended_address64), 334 ACPI_AML_SIZE_LARGE(struct aml_resource_gpio), 335 0, 336 ACPI_AML_SIZE_LARGE(struct aml_resource_common_serialbus), 337}; 338 339const u8 acpi_gbl_resource_aml_serial_bus_sizes[] = { 340 0, 341 ACPI_AML_SIZE_LARGE(struct aml_resource_i2c_serialbus), 342 ACPI_AML_SIZE_LARGE(struct aml_resource_spi_serialbus), 343 ACPI_AML_SIZE_LARGE(struct aml_resource_uart_serialbus), 344}; 345 346/* 347 * Resource types, used to validate the resource length field. 348 * The length of fixed-length types must match exactly, variable 349 * lengths must meet the minimum required length, etc. 350 * Zero indicates a reserved (and therefore invalid) resource type. 351 */ 352static const u8 acpi_gbl_resource_types[] = { 353 /* Small descriptors */ 354 355 0, 356 0, 357 0, 358 0, 359 ACPI_SMALL_VARIABLE_LENGTH, /* 04 IRQ */ 360 ACPI_FIXED_LENGTH, /* 05 DMA */ 361 ACPI_SMALL_VARIABLE_LENGTH, /* 06 start_dependent_functions */ 362 ACPI_FIXED_LENGTH, /* 07 end_dependent_functions */ 363 ACPI_FIXED_LENGTH, /* 08 IO */ 364 ACPI_FIXED_LENGTH, /* 09 fixed_IO */ 365 ACPI_FIXED_LENGTH, /* 0A fixed_DMA */ 366 0, 367 0, 368 0, 369 ACPI_VARIABLE_LENGTH, /* 0E vendor_short */ 370 ACPI_FIXED_LENGTH, /* 0F end_tag */ 371 372 /* Large descriptors */ 373 374 0, 375 ACPI_FIXED_LENGTH, /* 01 Memory24 */ 376 ACPI_FIXED_LENGTH, /* 02 generic_register */ 377 0, 378 ACPI_VARIABLE_LENGTH, /* 04 vendor_long */ 379 ACPI_FIXED_LENGTH, /* 05 Memory32 */ 380 ACPI_FIXED_LENGTH, /* 06 memory32_fixed */ 381 ACPI_VARIABLE_LENGTH, /* 07 Dword* address */ 382 ACPI_VARIABLE_LENGTH, /* 08 Word* address */ 383 ACPI_VARIABLE_LENGTH, /* 09 extended_IRQ */ 384 ACPI_VARIABLE_LENGTH, /* 0A Qword* address */ 385 ACPI_FIXED_LENGTH, /* 0B Extended* address */ 386 ACPI_VARIABLE_LENGTH, /* 0C Gpio* */ 387 0, 388 ACPI_VARIABLE_LENGTH /* 0E *serial_bus */ 389}; 390 391/******************************************************************************* 392 * 393 * FUNCTION: acpi_ut_walk_aml_resources 394 * 395 * PARAMETERS: walk_state - Current walk info 396 * PARAMETERS: aml - Pointer to the raw AML resource template 397 * aml_length - Length of the entire template 398 * user_function - Called once for each descriptor found. If 399 * NULL, a pointer to the end_tag is returned 400 * context - Passed to user_function 401 * 402 * RETURN: Status 403 * 404 * DESCRIPTION: Walk a raw AML resource list(buffer). User function called 405 * once for each resource found. 406 * 407 ******************************************************************************/ 408 409acpi_status 410acpi_ut_walk_aml_resources(struct acpi_walk_state *walk_state, 411 u8 *aml, 412 acpi_size aml_length, 413 acpi_walk_aml_callback user_function, void **context) 414{ 415 acpi_status status; 416 u8 *end_aml; 417 u8 resource_index; 418 u32 length; 419 u32 offset = 0; 420 u8 end_tag[2] = { 0x79, 0x00 }; 421 422 ACPI_FUNCTION_TRACE(ut_walk_aml_resources); 423 424 /* The absolute minimum resource template is one end_tag descriptor */ 425 426 if (aml_length < sizeof(struct aml_resource_end_tag)) { 427 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); 428 } 429 430 /* Point to the end of the resource template buffer */ 431 432 end_aml = aml + aml_length; 433 434 /* Walk the byte list, abort on any invalid descriptor type or length */ 435 436 while (aml < end_aml) { 437 438 /* Validate the Resource Type and Resource Length */ 439 440 status = 441 acpi_ut_validate_resource(walk_state, aml, &resource_index); 442 if (ACPI_FAILURE(status)) { 443 /* 444 * Exit on failure. Cannot continue because the descriptor length 445 * may be bogus also. 446 */ 447 return_ACPI_STATUS(status); 448 } 449 450 /* Get the length of this descriptor */ 451 452 length = acpi_ut_get_descriptor_length(aml); 453 454 /* Invoke the user function */ 455 456 if (user_function) { 457 status = 458 user_function(aml, length, offset, resource_index, 459 context); 460 if (ACPI_FAILURE(status)) { 461 return_ACPI_STATUS(status); 462 } 463 } 464 465 /* An end_tag descriptor terminates this resource template */ 466 467 if (acpi_ut_get_resource_type(aml) == 468 ACPI_RESOURCE_NAME_END_TAG) { 469 /* 470 * There must be at least one more byte in the buffer for 471 * the 2nd byte of the end_tag 472 */ 473 if ((aml + 1) >= end_aml) { 474 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); 475 } 476 477 /* Return the pointer to the end_tag if requested */ 478 479 if (!user_function) { 480 *context = aml; 481 } 482 483 /* Normal exit */ 484 485 return_ACPI_STATUS(AE_OK); 486 } 487 488 aml += length; 489 offset += length; 490 } 491 492 /* Did not find an end_tag descriptor */ 493 494 if (user_function) { 495 496 /* Insert an end_tag anyway. acpi_rs_get_list_length always leaves room */ 497 498 (void)acpi_ut_validate_resource(walk_state, end_tag, 499 &resource_index); 500 status = 501 user_function(end_tag, 2, offset, resource_index, context); 502 if (ACPI_FAILURE(status)) { 503 return_ACPI_STATUS(status); 504 } 505 } 506 507 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); 508} 509 510/******************************************************************************* 511 * 512 * FUNCTION: acpi_ut_validate_resource 513 * 514 * PARAMETERS: walk_state - Current walk info 515 * aml - Pointer to the raw AML resource descriptor 516 * return_index - Where the resource index is returned. NULL 517 * if the index is not required. 518 * 519 * RETURN: Status, and optionally the Index into the global resource tables 520 * 521 * DESCRIPTION: Validate an AML resource descriptor by checking the Resource 522 * Type and Resource Length. Returns an index into the global 523 * resource information/dispatch tables for later use. 524 * 525 ******************************************************************************/ 526 527acpi_status 528acpi_ut_validate_resource(struct acpi_walk_state *walk_state, 529 void *aml, u8 *return_index) 530{ 531 union aml_resource *aml_resource; 532 u8 resource_type; 533 u8 resource_index; 534 acpi_rs_length resource_length; 535 acpi_rs_length minimum_resource_length; 536 537 ACPI_FUNCTION_ENTRY(); 538 539 /* 540 * 1) Validate the resource_type field (Byte 0) 541 */ 542 resource_type = ACPI_GET8(aml); 543 544 /* 545 * Byte 0 contains the descriptor name (Resource Type) 546 * Examine the large/small bit in the resource header 547 */ 548 if (resource_type & ACPI_RESOURCE_NAME_LARGE) { 549 550 /* Verify the large resource type (name) against the max */ 551 552 if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) { 553 goto invalid_resource; 554 } 555 556 /* 557 * Large Resource Type -- bits 6:0 contain the name 558 * Translate range 0x80-0x8B to index range 0x10-0x1B 559 */ 560 resource_index = (u8) (resource_type - 0x70); 561 } else { 562 /* 563 * Small Resource Type -- bits 6:3 contain the name 564 * Shift range to index range 0x00-0x0F 565 */ 566 resource_index = (u8) 567 ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3); 568 } 569 570 /* 571 * Check validity of the resource type, via acpi_gbl_resource_types. Zero 572 * indicates an invalid resource. 573 */ 574 if (!acpi_gbl_resource_types[resource_index]) { 575 goto invalid_resource; 576 } 577 578 /* 579 * Validate the resource_length field. This ensures that the length 580 * is at least reasonable, and guarantees that it is non-zero. 581 */ 582 resource_length = acpi_ut_get_resource_length(aml); 583 minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index]; 584 585 /* Validate based upon the type of resource - fixed length or variable */ 586 587 switch (acpi_gbl_resource_types[resource_index]) { 588 case ACPI_FIXED_LENGTH: 589 590 /* Fixed length resource, length must match exactly */ 591 592 if (resource_length != minimum_resource_length) { 593 goto bad_resource_length; 594 } 595 break; 596 597 case ACPI_VARIABLE_LENGTH: 598 599 /* Variable length resource, length must be at least the minimum */ 600 601 if (resource_length < minimum_resource_length) { 602 goto bad_resource_length; 603 } 604 break; 605 606 case ACPI_SMALL_VARIABLE_LENGTH: 607 608 /* Small variable length resource, length can be (Min) or (Min-1) */ 609 610 if ((resource_length > minimum_resource_length) || 611 (resource_length < (minimum_resource_length - 1))) { 612 goto bad_resource_length; 613 } 614 break; 615 616 default: 617 618 /* Shouldn't happen (because of validation earlier), but be sure */ 619 620 goto invalid_resource; 621 } 622 623 aml_resource = ACPI_CAST_PTR(union aml_resource, aml); 624 if (resource_type == ACPI_RESOURCE_NAME_SERIAL_BUS) { 625 626 /* Validate the bus_type field */ 627 628 if ((aml_resource->common_serial_bus.type == 0) || 629 (aml_resource->common_serial_bus.type > 630 AML_RESOURCE_MAX_SERIALBUSTYPE)) { 631 if (walk_state) { 632 ACPI_ERROR((AE_INFO, 633 "Invalid/unsupported SerialBus resource descriptor: BusType 0x%2.2X", 634 aml_resource->common_serial_bus. 635 type)); 636 } 637 return (AE_AML_INVALID_RESOURCE_TYPE); 638 } 639 } 640 641 /* Optionally return the resource table index */ 642 643 if (return_index) { 644 *return_index = resource_index; 645 } 646 647 return (AE_OK); 648 649invalid_resource: 650 651 if (walk_state) { 652 ACPI_ERROR((AE_INFO, 653 "Invalid/unsupported resource descriptor: Type 0x%2.2X", 654 resource_type)); 655 } 656 return (AE_AML_INVALID_RESOURCE_TYPE); 657 658bad_resource_length: 659 660 if (walk_state) { 661 ACPI_ERROR((AE_INFO, 662 "Invalid resource descriptor length: Type " 663 "0x%2.2X, Length 0x%4.4X, MinLength 0x%4.4X", 664 resource_type, resource_length, 665 minimum_resource_length)); 666 } 667 return (AE_AML_BAD_RESOURCE_LENGTH); 668} 669 670/******************************************************************************* 671 * 672 * FUNCTION: acpi_ut_get_resource_type 673 * 674 * PARAMETERS: aml - Pointer to the raw AML resource descriptor 675 * 676 * RETURN: The Resource Type with no extraneous bits (except the 677 * Large/Small descriptor bit -- this is left alone) 678 * 679 * DESCRIPTION: Extract the Resource Type/Name from the first byte of 680 * a resource descriptor. 681 * 682 ******************************************************************************/ 683 684u8 acpi_ut_get_resource_type(void *aml) 685{ 686 ACPI_FUNCTION_ENTRY(); 687 688 /* 689 * Byte 0 contains the descriptor name (Resource Type) 690 * Examine the large/small bit in the resource header 691 */ 692 if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) { 693 694 /* Large Resource Type -- bits 6:0 contain the name */ 695 696 return (ACPI_GET8(aml)); 697 } else { 698 /* Small Resource Type -- bits 6:3 contain the name */ 699 700 return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK)); 701 } 702} 703 704/******************************************************************************* 705 * 706 * FUNCTION: acpi_ut_get_resource_length 707 * 708 * PARAMETERS: aml - Pointer to the raw AML resource descriptor 709 * 710 * RETURN: Byte Length 711 * 712 * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By 713 * definition, this does not include the size of the descriptor 714 * header or the length field itself. 715 * 716 ******************************************************************************/ 717 718u16 acpi_ut_get_resource_length(void *aml) 719{ 720 acpi_rs_length resource_length; 721 722 ACPI_FUNCTION_ENTRY(); 723 724 /* 725 * Byte 0 contains the descriptor name (Resource Type) 726 * Examine the large/small bit in the resource header 727 */ 728 if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) { 729 730 /* Large Resource type -- bytes 1-2 contain the 16-bit length */ 731 732 ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1)); 733 734 } else { 735 /* Small Resource type -- bits 2:0 of byte 0 contain the length */ 736 737 resource_length = (u16) (ACPI_GET8(aml) & 738 ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK); 739 } 740 741 return (resource_length); 742} 743 744/******************************************************************************* 745 * 746 * FUNCTION: acpi_ut_get_resource_header_length 747 * 748 * PARAMETERS: aml - Pointer to the raw AML resource descriptor 749 * 750 * RETURN: Length of the AML header (depends on large/small descriptor) 751 * 752 * DESCRIPTION: Get the length of the header for this resource. 753 * 754 ******************************************************************************/ 755 756u8 acpi_ut_get_resource_header_length(void *aml) 757{ 758 ACPI_FUNCTION_ENTRY(); 759 760 /* Examine the large/small bit in the resource header */ 761 762 if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) { 763 return (sizeof(struct aml_resource_large_header)); 764 } else { 765 return (sizeof(struct aml_resource_small_header)); 766 } 767} 768 769/******************************************************************************* 770 * 771 * FUNCTION: acpi_ut_get_descriptor_length 772 * 773 * PARAMETERS: aml - Pointer to the raw AML resource descriptor 774 * 775 * RETURN: Byte length 776 * 777 * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the 778 * length of the descriptor header and the length field itself. 779 * Used to walk descriptor lists. 780 * 781 ******************************************************************************/ 782 783u32 acpi_ut_get_descriptor_length(void *aml) 784{ 785 ACPI_FUNCTION_ENTRY(); 786 787 /* 788 * Get the Resource Length (does not include header length) and add 789 * the header length (depends on if this is a small or large resource) 790 */ 791 return (acpi_ut_get_resource_length(aml) + 792 acpi_ut_get_resource_header_length(aml)); 793} 794 795/******************************************************************************* 796 * 797 * FUNCTION: acpi_ut_get_resource_end_tag 798 * 799 * PARAMETERS: obj_desc - The resource template buffer object 800 * end_tag - Where the pointer to the end_tag is returned 801 * 802 * RETURN: Status, pointer to the end tag 803 * 804 * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template 805 * Note: allows a buffer length of zero. 806 * 807 ******************************************************************************/ 808 809acpi_status 810acpi_ut_get_resource_end_tag(union acpi_operand_object *obj_desc, u8 **end_tag) 811{ 812 acpi_status status; 813 814 ACPI_FUNCTION_TRACE(ut_get_resource_end_tag); 815 816 /* Allow a buffer length of zero */ 817 818 if (!obj_desc->buffer.length) { 819 *end_tag = obj_desc->buffer.pointer; 820 return_ACPI_STATUS(AE_OK); 821 } 822 823 /* Validate the template and get a pointer to the end_tag */ 824 825 status = acpi_ut_walk_aml_resources(NULL, obj_desc->buffer.pointer, 826 obj_desc->buffer.length, NULL, 827 (void **)end_tag); 828 829 return_ACPI_STATUS(status); 830} 831