16974SN/A/******************************************************************************* 26974SN/A * 36974SN/A * Module Name: dmresrc.c - Resource Descriptor disassembly 46974SN/A * 56974SN/A ******************************************************************************/ 66974SN/A 76974SN/A/****************************************************************************** 86974SN/A * 96974SN/A * 1. Copyright Notice 106974SN/A * 116974SN/A * Some or all of this work - Copyright (c) 1999 - 2017, Intel Corp. 126974SN/A * All rights reserved. 136974SN/A * 146974SN/A * 2. License 156974SN/A * 166974SN/A * 2.1. This is your license from Intel Corp. under its intellectual property 176974SN/A * rights. You may have additional license terms from the party that provided 186974SN/A * you this software, covering your right to use that party's intellectual 196974SN/A * property rights. 206974SN/A * 216974SN/A * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 226974SN/A * copy of the source code appearing in this file ("Covered Code") an 236974SN/A * irrevocable, perpetual, worldwide license under Intel's copyrights in the 246974SN/A * base code distributed originally by Intel ("Original Intel Code") to copy, 256974SN/A * make derivatives, distribute, use and display any portion of the Covered 266974SN/A * Code in any form, with the right to sublicense such rights; and 276974SN/A * 286974SN/A * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 296974SN/A * license (with the right to sublicense), under only those claims of Intel 306974SN/A * patents that are infringed by the Original Intel Code, to make, use, sell, 316974SN/A * offer to sell, and import the Covered Code and derivative works thereof 326974SN/A * solely to the minimum extent necessary to exercise the above copyright 336974SN/A * license, and in no event shall the patent license extend to any additions 346974SN/A * to or modifications of the Original Intel Code. No other license or right 356974SN/A * is granted directly or by implication, estoppel or otherwise; 366974SN/A * 376974SN/A * The above copyright and patent license is granted only if the following 386974SN/A * conditions are met: 396974SN/A * 406974SN/A * 3. Conditions 416974SN/A * 426974SN/A * 3.1. Redistribution of Source with Rights to Further Distribute Source. 436974SN/A * Redistribution of source code of any substantial portion of the Covered 446974SN/A * Code or modification with rights to further distribute source must include 456974SN/A * the above Copyright Notice, the above License, this list of Conditions, 466974SN/A * and the following Disclaimer and Export Compliance provision. In addition, 476974SN/A * Licensee must cause all Covered Code to which Licensee contributes to 486974SN/A * contain a file documenting the changes Licensee made to create that Covered 496974SN/A * Code and the date of any change. Licensee must include in that file the 506974SN/A * documentation of any changes made by any predecessor Licensee. Licensee 516974SN/A * must include a prominent statement that the modification is derived, 526974SN/A * directly or indirectly, from Original Intel Code. 536974SN/A * 546974SN/A * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 556974SN/A * Redistribution of source code of any substantial portion of the Covered 566974SN/A * Code or modification without rights to further distribute source must 576974SN/A * include the following Disclaimer and Export Compliance provision in the 587528SN/A * documentation and/or other materials provided with distribution. In 597528SN/A * addition, Licensee may not authorize further sublicense of source of any 607528SN/A * portion of the Covered Code, and must include terms to the effect that the 617528SN/A * license from Licensee to its licensee is limited to the intellectual 627528SN/A * property embodied in the software Licensee provides to its licensee, and 637528SN/A * not to intellectual property embodied in modifications its licensee may 647528SN/A * make. 657528SN/A * 666974SN/A * 3.3. Redistribution of Executable. Redistribution in executable form of any 676974SN/A * substantial portion of the Covered Code or modification must reproduce the 687528SN/A * above Copyright Notice, and the following Disclaimer and Export Compliance 697528SN/A * provision in the documentation and/or other materials provided with the 707528SN/A * distribution. 717528SN/A * 727528SN/A * 3.4. Intel retains all right, title, and interest in and to the Original 737528SN/A * Intel Code. 747528SN/A * 757528SN/A * 3.5. Neither the name Intel nor any other trademark owned or controlled by 767528SN/A * Intel shall be used in advertising or otherwise to promote the sale, use or 777528SN/A * other dealings in products derived from or relating to the Covered Code 787528SN/A * without prior written authorization from Intel. 798626SN/A * 807528SN/A * 4. Disclaimer and Export Compliance 816974SN/A * 826974SN/A * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 836974SN/A * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 846974SN/A * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 856974SN/A * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 867528SN/A * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 876974SN/A * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 886974SN/A * PARTICULAR PURPOSE. 896974SN/A * 906974SN/A * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 916974SN/A * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 926974SN/A * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 936974SN/A * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 946974SN/A * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 956974SN/A * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 966974SN/A * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 978626SN/A * LIMITED REMEDY. 988626SN/A * 998626SN/A * 4.3. Licensee shall not export, either directly or indirectly, any of this 1008626SN/A * software or system incorporating such software without first obtaining any 1016974SN/A * required license or other approval from the U. S. Department of Commerce or 1026974SN/A * any other agency or department of the United States Government. In the 1036974SN/A * event Licensee exports any such software from the United States or 1046974SN/A * re-exports any such software from a foreign destination, Licensee shall 1056974SN/A * ensure that the distribution and export/re-export of the software is in 1066974SN/A * compliance with all laws, regulations, orders, or other restrictions of the 1076974SN/A * U.S. Export Administration Regulations. Licensee agrees that neither it nor 1086974SN/A * any of its subsidiaries will export/re-export any technical data, process, 1096974SN/A * software, or service, directly or indirectly, to any country for which the 1106974SN/A * United States government or any agency thereof requires an export license, 1116974SN/A * other governmental approval, or letter of assurance, without first obtaining 1126974SN/A * such license, approval or letter. 1137287SN/A * 1146974SN/A ***************************************************************************** 1156974SN/A * 1166974SN/A * Alternatively, you may choose to be licensed under the terms of the 1176974SN/A * following license: 1186974SN/A * 1196974SN/A * Redistribution and use in source and binary forms, with or without 1206974SN/A * modification, are permitted provided that the following conditions 1216974SN/A * are met: 1226974SN/A * 1. Redistributions of source code must retain the above copyright 1236974SN/A * notice, this list of conditions, and the following disclaimer, 1246974SN/A * without modification. 1256974SN/A * 2. Redistributions in binary form must reproduce at minimum a disclaimer 1266974SN/A * substantially similar to the "NO WARRANTY" disclaimer below 1276974SN/A * ("Disclaimer") and any redistribution must be conditioned upon 1286974SN/A * including a substantially similar Disclaimer requirement for further 1296974SN/A * binary redistribution. 1306974SN/A * 3. Neither the names of the above-listed copyright holders nor the names 1316974SN/A * of any contributors may be used to endorse or promote products derived 1326974SN/A * from this software without specific prior written permission. 1336974SN/A * 1346974SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 1356974SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 1366974SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 1376974SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 1386974SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 1396974SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 1406974SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 1416974SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 1426974SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 1436974SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 1446974SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 1456974SN/A * 1467287SN/A * Alternatively, you may choose to be licensed under the terms of the 1477287SN/A * GNU General Public License ("GPL") version 2 as published by the Free 1486974SN/A * Software Foundation. 1496974SN/A * 1506974SN/A *****************************************************************************/ 1516974SN/A 1526974SN/A#include <contrib/dev/acpica/include/acpi.h> 1536974SN/A#include <contrib/dev/acpica/include/accommon.h> 1546974SN/A#include <contrib/dev/acpica/include/amlcode.h> 1556974SN/A#include <contrib/dev/acpica/include/acdisasm.h> 1566974SN/A 1576974SN/A 1586974SN/A#define _COMPONENT ACPI_CA_DEBUGGER 1596974SN/A ACPI_MODULE_NAME ("dbresrc") 1607528SN/A 1616974SN/A 1626974SN/A/* Dispatch tables for Resource disassembly functions */ 1636974SN/A 1646974SN/Astatic ACPI_RESOURCE_HANDLER AcpiGbl_DmResourceDispatch [] = 1656974SN/A{ 1666974SN/A /* Small descriptors */ 1676974SN/A 1686974SN/A NULL, /* 0x00, Reserved */ 1696974SN/A NULL, /* 0x01, Reserved */ 1706974SN/A NULL, /* 0x02, Reserved */ 1718626SN/A NULL, /* 0x03, Reserved */ 1728626SN/A AcpiDmIrqDescriptor, /* 0x04, ACPI_RESOURCE_NAME_IRQ_FORMAT */ 1738626SN/A AcpiDmDmaDescriptor, /* 0x05, ACPI_RESOURCE_NAME_DMA_FORMAT */ 1748626SN/A AcpiDmStartDependentDescriptor, /* 0x06, ACPI_RESOURCE_NAME_START_DEPENDENT */ 1756974SN/A AcpiDmEndDependentDescriptor, /* 0x07, ACPI_RESOURCE_NAME_END_DEPENDENT */ 1766974SN/A AcpiDmIoDescriptor, /* 0x08, ACPI_RESOURCE_NAME_IO_PORT */ 1776974SN/A AcpiDmFixedIoDescriptor, /* 0x09, ACPI_RESOURCE_NAME_FIXED_IO_PORT */ 1786974SN/A AcpiDmFixedDmaDescriptor, /* 0x0A, ACPI_RESOURCE_NAME_FIXED_DMA */ 1796974SN/A NULL, /* 0x0B, Reserved */ 1806974SN/A NULL, /* 0x0C, Reserved */ 1816974SN/A NULL, /* 0x0D, Reserved */ 1826974SN/A AcpiDmVendorSmallDescriptor, /* 0x0E, ACPI_RESOURCE_NAME_SMALL_VENDOR */ 1836974SN/A NULL, /* 0x0F, ACPI_RESOURCE_NAME_END_TAG (not used) */ 1846974SN/A 1856974SN/A /* Large descriptors */ 1866974SN/A 1877287SN/A NULL, /* 0x00, Reserved */ 1886974SN/A AcpiDmMemory24Descriptor, /* 0x01, ACPI_RESOURCE_NAME_MEMORY_24 */ 1896974SN/A AcpiDmGenericRegisterDescriptor,/* 0x02, ACPI_RESOURCE_NAME_GENERIC_REGISTER */ 1906974SN/A NULL, /* 0x03, Reserved */ 1916974SN/A AcpiDmVendorLargeDescriptor, /* 0x04, ACPI_RESOURCE_NAME_LARGE_VENDOR */ 1926974SN/A AcpiDmMemory32Descriptor, /* 0x05, ACPI_RESOURCE_NAME_MEMORY_32 */ 1936974SN/A AcpiDmFixedMemory32Descriptor, /* 0x06, ACPI_RESOURCE_NAME_FIXED_MEMORY_32 */ 1946974SN/A AcpiDmDwordDescriptor, /* 0x07, ACPI_RESOURCE_NAME_DWORD_ADDRESS_SPACE */ 1956974SN/A AcpiDmWordDescriptor, /* 0x08, ACPI_RESOURCE_NAME_WORD_ADDRESS_SPACE */ 1966974SN/A AcpiDmInterruptDescriptor, /* 0x09, ACPI_RESOURCE_NAME_EXTENDED_XRUPT */ 1976974SN/A AcpiDmQwordDescriptor, /* 0x0A, ACPI_RESOURCE_NAME_QWORD_ADDRESS_SPACE */ 1986974SN/A AcpiDmExtendedDescriptor, /* 0x0B, ACPI_RESOURCE_NAME_EXTENDED_ADDRESS_SPACE */ 1996974SN/A AcpiDmGpioDescriptor, /* 0x0C, ACPI_RESOURCE_NAME_GPIO */ 2006974SN/A AcpiDmPinFunctionDescriptor, /* 0x0D, ACPI_RESOURCE_NAME_PIN_FUNCTION */ 2016974SN/A AcpiDmSerialBusDescriptor, /* 0x0E, ACPI_RESOURCE_NAME_SERIAL_BUS */ 2026974SN/A AcpiDmPinConfigDescriptor, /* 0x0F, ACPI_RESOURCE_NAME_PIN_CONFIG */ 2036974SN/A AcpiDmPinGroupDescriptor, /* 0x10, ACPI_RESOURCE_NAME_PIN_GROUP */ 2046974SN/A AcpiDmPinGroupFunctionDescriptor, /* 0x11, ACPI_RESOURCE_NAME_PIN_GROUP_FUNCTION */ 2056974SN/A AcpiDmPinGroupConfigDescriptor, /* 0x12, ACPI_RESOURCE_NAME_PIN_GROUP_CONFIG */ 2066974SN/A}; 2076974SN/A 2086974SN/A 2096974SN/A/* Only used for single-threaded applications */ 2106974SN/A/* TBD: remove when name is passed as parameter to the dump functions */ 2116974SN/A 2126974SN/Astatic UINT32 ResourceName; 2136974SN/A 2146974SN/A 2156974SN/A/******************************************************************************* 2166974SN/A * 2176974SN/A * FUNCTION: AcpiDmDescriptorName 2186974SN/A * 2196974SN/A * PARAMETERS: None 2207287SN/A * 2217287SN/A * RETURN: None 2226974SN/A * 2236974SN/A * DESCRIPTION: Emit a name for the descriptor if one is present (indicated 2246974SN/A * by the name being changed from the default name.) A name is only 2256974SN/A * emitted if a reference to the descriptor has been made somewhere 2266974SN/A * in the original ASL code. 2276974SN/A * 2286974SN/A ******************************************************************************/ 2296974SN/A 2306974SN/Avoid 2316974SN/AAcpiDmDescriptorName ( 2326974SN/A void) 2337528SN/A{ 2346974SN/A 2356974SN/A if (ResourceName == ACPI_DEFAULT_RESNAME) 2366974SN/A { 2376974SN/A return; 2386974SN/A } 2396974SN/A 2406974SN/A AcpiOsPrintf ("%4.4s", (char *) &ResourceName); 2416974SN/A} 2426974SN/A 2436974SN/A 2448626SN/A/******************************************************************************* 2458626SN/A * 2468626SN/A * FUNCTION: AcpiDmDumpInteger* 2478626SN/A * 2486974SN/A * PARAMETERS: Value - Value to emit 2496974SN/A * Name - Associated name (emitted as a comment) 2506974SN/A * 2516974SN/A * RETURN: None 2526974SN/A * 2536974SN/A * DESCRIPTION: Integer output helper functions 2546974SN/A * 2556974SN/A ******************************************************************************/ 2566974SN/A 2576974SN/Avoid 2586974SN/AAcpiDmDumpInteger8 ( 2596974SN/A UINT8 Value, 2607287SN/A const char *Name) 2616974SN/A{ 2626974SN/A AcpiOsPrintf ("0x%2.2X, // %s\n", Value, Name); 2636974SN/A} 2646974SN/A 2656974SN/Avoid 2666974SN/AAcpiDmDumpInteger16 ( 2676974SN/A UINT16 Value, 2686974SN/A const char *Name) 2696974SN/A{ 2706974SN/A AcpiOsPrintf ("0x%4.4X, // %s\n", Value, Name); 2716974SN/A} 2726974SN/A 2736974SN/Avoid 2746974SN/AAcpiDmDumpInteger32 ( 2756974SN/A UINT32 Value, 2766974SN/A const char *Name) 2776974SN/A{ 2786974SN/A AcpiOsPrintf ("0x%8.8X, // %s\n", Value, Name); 2796974SN/A} 2806974SN/A 2816974SN/Avoid 2826974SN/AAcpiDmDumpInteger64 ( 2836974SN/A UINT64 Value, 2846974SN/A const char *Name) 2856974SN/A{ 2866974SN/A AcpiOsPrintf ("0x%8.8X%8.8X, // %s\n", ACPI_FORMAT_UINT64 (Value), Name); 2876974SN/A} 2886974SN/A 2896974SN/A 2906974SN/A/******************************************************************************* 2916974SN/A * 2926974SN/A * FUNCTION: AcpiDmBitList 2936974SN/A * 2947287SN/A * PARAMETERS: Mask - 16-bit value corresponding to 16 interrupt 2957287SN/A * or DMA values 2966974SN/A * 2976974SN/A * RETURN: None 2986974SN/A * 2996974SN/A * DESCRIPTION: Dump a bit mask as a list of individual interrupt/DMA levels. 3006974SN/A * 3016974SN/A ******************************************************************************/ 3026974SN/A 303void 304AcpiDmBitList ( 305 UINT16 Mask) 306{ 307 UINT32 i; 308 BOOLEAN Previous = FALSE; 309 310 311 /* Open the initializer list */ 312 313 AcpiOsPrintf ("{"); 314 315 /* Examine each bit */ 316 317 for (i = 0; i < 16; i++) 318 { 319 /* Only interested in bits that are set to 1 */ 320 321 if (Mask & 1) 322 { 323 if (Previous) 324 { 325 AcpiOsPrintf (","); 326 } 327 328 Previous = TRUE; 329 AcpiOsPrintf ("%u", i); 330 } 331 332 Mask >>= 1; 333 } 334 335 /* Close list */ 336 337 AcpiOsPrintf ("}\n"); 338} 339 340 341/******************************************************************************* 342 * 343 * FUNCTION: AcpiDmResourceTemplate 344 * 345 * PARAMETERS: Info - Curent parse tree walk info 346 * ByteData - Pointer to the byte list data 347 * ByteCount - Length of the byte list 348 * 349 * RETURN: None 350 * 351 * DESCRIPTION: Dump the contents of a Resource Template containing a set of 352 * Resource Descriptors. 353 * 354 ******************************************************************************/ 355 356void 357AcpiDmResourceTemplate ( 358 ACPI_OP_WALK_INFO *Info, 359 ACPI_PARSE_OBJECT *Op, 360 UINT8 *ByteData, 361 UINT32 ByteCount) 362{ 363 ACPI_STATUS Status; 364 UINT32 CurrentByteOffset; 365 UINT8 ResourceType; 366 UINT32 ResourceLength; 367 void *Aml; 368 UINT32 Level; 369 BOOLEAN DependentFns = FALSE; 370 UINT8 ResourceIndex; 371 ACPI_NAMESPACE_NODE *Node; 372 373 374 if (Op->Asl.AmlOpcode != AML_FIELD_OP) 375 { 376 Info->MappingOp = Op; 377 } 378 379 Level = Info->Level; 380 ResourceName = ACPI_DEFAULT_RESNAME; 381 Node = Op->Common.Node; 382 if (Node) 383 { 384 Node = Node->Child; 385 } 386 387 for (CurrentByteOffset = 0; CurrentByteOffset < ByteCount;) 388 { 389 Aml = &ByteData[CurrentByteOffset]; 390 391 /* Get the descriptor type and length */ 392 393 ResourceType = AcpiUtGetResourceType (Aml); 394 ResourceLength = AcpiUtGetResourceLength (Aml); 395 396 /* Validate the Resource Type and Resource Length */ 397 398 Status = AcpiUtValidateResource (NULL, Aml, &ResourceIndex); 399 if (ACPI_FAILURE (Status)) 400 { 401 AcpiOsPrintf ( 402 "/*** Could not validate Resource, type (%X) %s***/\n", 403 ResourceType, AcpiFormatException (Status)); 404 return; 405 } 406 407 /* Point to next descriptor */ 408 409 CurrentByteOffset += AcpiUtGetDescriptorLength (Aml); 410 411 /* Descriptor pre-processing */ 412 413 switch (ResourceType) 414 { 415 case ACPI_RESOURCE_NAME_START_DEPENDENT: 416 417 /* Finish a previous StartDependentFns */ 418 419 if (DependentFns) 420 { 421 Level--; 422 AcpiDmIndent (Level); 423 AcpiOsPrintf ("}\n"); 424 } 425 break; 426 427 case ACPI_RESOURCE_NAME_END_DEPENDENT: 428 429 Level--; 430 DependentFns = FALSE; 431 break; 432 433 case ACPI_RESOURCE_NAME_END_TAG: 434 435 /* Normal exit, the resource list is finished */ 436 437 if (DependentFns) 438 { 439 /* 440 * Close an open StartDependentDescriptor. This indicates a 441 * missing EndDependentDescriptor. 442 */ 443 Level--; 444 DependentFns = FALSE; 445 446 /* Go ahead and insert EndDependentFn() */ 447 448 AcpiDmEndDependentDescriptor (Info, Aml, ResourceLength, Level); 449 450 AcpiDmIndent (Level); 451 AcpiOsPrintf ( 452 "/*** Disassembler: inserted " 453 "missing EndDependentFn () ***/\n"); 454 } 455 return; 456 457 default: 458 459 break; 460 } 461 462 /* Disassemble the resource structure */ 463 464 if (Node) 465 { 466 ResourceName = Node->Name.Integer; 467 Node = Node->Peer; 468 } 469 470 AcpiGbl_DmResourceDispatch [ResourceIndex] ( 471 Info, Aml, ResourceLength, Level); 472 473 /* Descriptor post-processing */ 474 475 if (ResourceType == ACPI_RESOURCE_NAME_START_DEPENDENT) 476 { 477 DependentFns = TRUE; 478 Level++; 479 } 480 } 481} 482 483 484/******************************************************************************* 485 * 486 * FUNCTION: AcpiDmIsResourceTemplate 487 * 488 * PARAMETERS: WalkState - Current walk info 489 * Op - Buffer Op to be examined 490 * 491 * RETURN: Status. AE_OK if valid template 492 * 493 * DESCRIPTION: Walk a byte list to determine if it consists of a valid set 494 * of resource descriptors. Nothing is output. 495 * 496 ******************************************************************************/ 497 498ACPI_STATUS 499AcpiDmIsResourceTemplate ( 500 ACPI_WALK_STATE *WalkState, 501 ACPI_PARSE_OBJECT *Op) 502{ 503 ACPI_STATUS Status; 504 ACPI_PARSE_OBJECT *NextOp; 505 UINT8 *Aml; 506 UINT8 *EndAml; 507 UINT32 BufferLength; 508 UINT32 DeclaredBufferLength; 509 510 511 /* This op must be a buffer */ 512 513 if (Op->Common.AmlOpcode != AML_BUFFER_OP) 514 { 515 return (AE_TYPE); 516 } 517 518 /* 519 * Get the declared length of the buffer. 520 * This is the nn in "Buffer (nn)" 521 */ 522 NextOp = Op->Common.Value.Arg; 523 if (!NextOp) 524 { 525 AcpiOsPrintf ("NULL byte list in buffer\n"); 526 return (AE_TYPE); 527 } 528 529 DeclaredBufferLength = NextOp->Common.Value.Size; 530 531 /* Get the length of the raw initialization byte list */ 532 533 NextOp = NextOp->Common.Next; 534 if (!NextOp) 535 { 536 return (AE_TYPE); 537 } 538 539 Aml = NextOp->Named.Data; 540 BufferLength = NextOp->Common.Value.Size; 541 542 /* 543 * Any buffer smaller than one byte cannot possibly be a resource 544 * template. Two bytes could possibly be a "NULL" resource template 545 * with a lone end tag descriptor (as generated via 546 * "ResourceTemplate(){}"), but this would be an extremely unusual 547 * case, as the template would be essentially useless. The disassembler 548 * therefore does not recognize any two-byte buffer as a resource 549 * template. 550 */ 551 if (BufferLength <= 2) 552 { 553 return (AE_TYPE); 554 } 555 556 /* 557 * Not a template if declared buffer length != actual length of the 558 * intialization byte list. Because the resource macros will create 559 * a buffer of the exact required length (buffer length will be equal 560 * to the actual length). 561 * 562 * NOTE (April 2017): Resource templates with this issue have been 563 * seen in the field. We still don't want to attempt to disassemble 564 * a buffer like this to a resource template because this output 565 * would not match the original input buffer (it would be shorter 566 * than the original when the disassembled code is recompiled). 567 * Basically, a buffer like this appears to be hand crafted in the 568 * first place, so just emitting a buffer object instead of a 569 * resource template more closely resembles the original ASL code. 570 */ 571 if (DeclaredBufferLength != BufferLength) 572 { 573 return (AE_TYPE); 574 } 575 576 /* Walk the byte list, abort on any invalid descriptor type or length */ 577 578 Status = AcpiUtWalkAmlResources (WalkState, Aml, BufferLength, 579 NULL, ACPI_CAST_INDIRECT_PTR (void, &EndAml)); 580 if (ACPI_FAILURE (Status)) 581 { 582 return (AE_TYPE); 583 } 584 585 /* 586 * For the resource template to be valid, one EndTag must appear 587 * at the very end of the ByteList, not before. (For proper disassembly 588 * of a ResourceTemplate, the buffer must not have any extra data after 589 * the EndTag.) 590 */ 591 if ((Aml + BufferLength - sizeof (AML_RESOURCE_END_TAG)) != EndAml) 592 { 593 return (AE_AML_NO_RESOURCE_END_TAG); 594 } 595 596 /* 597 * All resource descriptors are valid, therefore this list appears 598 * to be a valid resource template 599 */ 600 return (AE_OK); 601} 602