sys/contrib/dev/acpica/source/common/dmtbdump.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dmtbdump - Dump ACPI data tables that contain no AML code
   4  *
   5  *****************************************************************************/
   6
   7 /******************************************************************************
   8  *
   9  * 1. Copyright Notice
  10  *
  11  * Some or all of this work - Copyright (c) 1999 - 2021, Intel Corp.
  12  * All rights reserved.
  13  *
  14  * 2. License
  15  *
  16  * 2.1. This is your license from Intel Corp. under its intellectual property
  17  * rights. You may have additional license terms from the party that provided
  18  * you this software, covering your right to use that party's intellectual
  19  * property rights.
  20  *
  21  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  22  * copy of the source code appearing in this file ("Covered Code") an
  23  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  24  * base code distributed originally by Intel ("Original Intel Code") to copy,
  25  * make derivatives, distribute, use and display any portion of the Covered
  26  * Code in any form, with the right to sublicense such rights; and
  27  *
  28  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  29  * license (with the right to sublicense), under only those claims of Intel
  30  * patents that are infringed by the Original Intel Code, to make, use, sell,
  31  * offer to sell, and import the Covered Code and derivative works thereof
  32  * solely to the minimum extent necessary to exercise the above copyright
  33  * license, and in no event shall the patent license extend to any additions
  34  * to or modifications of the Original Intel Code. No other license or right
  35  * is granted directly or by implication, estoppel or otherwise;
  36  *
  37  * The above copyright and patent license is granted only if the following
  38  * conditions are met:
  39  *
  40  * 3. Conditions
  41  *
  42  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  43  * Redistribution of source code of any substantial portion of the Covered
  44  * Code or modification with rights to further distribute source must include
  45  * the above Copyright Notice, the above License, this list of Conditions,
  46  * and the following Disclaimer and Export Compliance provision. In addition,
  47  * Licensee must cause all Covered Code to which Licensee contributes to
  48  * contain a file documenting the changes Licensee made to create that Covered
  49  * Code and the date of any change. Licensee must include in that file the
  50  * documentation of any changes made by any predecessor Licensee. Licensee
  51  * must include a prominent statement that the modification is derived,
  52  * directly or indirectly, from Original Intel Code.
  53  *
  54  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  55  * Redistribution of source code of any substantial portion of the Covered
  56  * Code or modification without rights to further distribute source must
  57  * include the following Disclaimer and Export Compliance provision in the
  58  * documentation and/or other materials provided with distribution. In
  59  * addition, Licensee may not authorize further sublicense of source of any
  60  * portion of the Covered Code, and must include terms to the effect that the
  61  * license from Licensee to its licensee is limited to the intellectual
  62  * property embodied in the software Licensee provides to its licensee, and
  63  * not to intellectual property embodied in modifications its licensee may
  64  * make.
  65  *
  66  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  67  * substantial portion of the Covered Code or modification must reproduce the
  68  * above Copyright Notice, and the following Disclaimer and Export Compliance
  69  * provision in the documentation and/or other materials provided with the
  70  * distribution.
  71  *
  72  * 3.4. Intel retains all right, title, and interest in and to the Original
  73  * Intel Code.
  74  *
  75  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  76  * Intel shall be used in advertising or otherwise to promote the sale, use or
  77  * other dealings in products derived from or relating to the Covered Code
  78  * without prior written authorization from Intel.
  79  *
  80  * 4. Disclaimer and Export Compliance
  81  *
  82  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  83  * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  84  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
  85  * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
  86  * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
  87  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  88  * PARTICULAR PURPOSE.
  89  *
  90  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  91  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  92  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  93  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  94  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  95  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
  96  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  97  * LIMITED REMEDY.
  98  *
  99  * 4.3. Licensee shall not export, either directly or indirectly, any of this
 100  * software or system incorporating such software without first obtaining any
 101  * required license or other approval from the U. S. Department of Commerce or
 102  * any other agency or department of the United States Government. In the
 103  * event Licensee exports any such software from the United States or
 104  * re-exports any such software from a foreign destination, Licensee shall
 105  * ensure that the distribution and export/re-export of the software is in
 106  * compliance with all laws, regulations, orders, or other restrictions of the
 107  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 108  * any of its subsidiaries will export/re-export any technical data, process,
 109  * software, or service, directly or indirectly, to any country for which the
 110  * United States government or any agency thereof requires an export license,
 111  * other governmental approval, or letter of assurance, without first obtaining
 112  * such license, approval or letter.
 113  *
 114  *****************************************************************************
 115  *
 116  * Alternatively, you may choose to be licensed under the terms of the
 117  * following license:
 118  *
 119  * Redistribution and use in source and binary forms, with or without
 120  * modification, are permitted provided that the following conditions
 121  * are met:
 122  * 1. Redistributions of source code must retain the above copyright
 123  *    notice, this list of conditions, and the following disclaimer,
 124  *    without modification.
 125  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 126  *    substantially similar to the "NO WARRANTY" disclaimer below
 127  *    ("Disclaimer") and any redistribution must be conditioned upon
 128  *    including a substantially similar Disclaimer requirement for further
 129  *    binary redistribution.
 130  * 3. Neither the names of the above-listed copyright holders nor the names
 131  *    of any contributors may be used to endorse or promote products derived
 132  *    from this software without specific prior written permission.
 133  *
 134  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 135  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 136  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 137  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 138  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 139  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 140  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 141  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 142  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 143  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 144  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 145  *
 146  * Alternatively, you may choose to be licensed under the terms of the
 147  * GNU General Public License ("GPL") version 2 as published by the Free
 148  * Software Foundation.
 149  *
 150  *****************************************************************************/
 151
 152 #include "acpi.h"
 153 #include "accommon.h"
 154 #include "acdisasm.h"
 155 #include "actables.h"
 156
 157 /* This module used for application-level code only */
 158
 159 #define _COMPONENT          ACPI_CA_DISASSEMBLER
 160         ACPI_MODULE_NAME    ("dmtbdump")
 161
 162
 163 /* Local prototypes */
 164
 165 static void
 166 AcpiDmValidateFadtLength (
 167     UINT32                  Revision,
 168     UINT32                  Length);
 169
 170
 171 /*******************************************************************************
 172  *
 173  * FUNCTION:    AcpiDmDumpBuffer
 174  *
 175  * PARAMETERS:  Table               - ACPI Table or subtable
 176  *              BufferOffset        - Offset of buffer from Table above
 177  *              Length              - Length of the buffer
 178  *              AbsoluteOffset      - Offset of buffer in the main ACPI table
 179  *              Header              - Name of the buffer field (printed on the
 180  *                                    first line only.)
 181  *
 182  * RETURN:      None
 183  *
 184  * DESCRIPTION: Format the contents of an arbitrary length data buffer (in the
 185  *              disassembler output format.)
 186  *
 187  ******************************************************************************/
 188
 189 void
 190 AcpiDmDumpBuffer (
 191     void                    *Table,
 192     UINT32                  BufferOffset,
 193     UINT32                  Length,
 194     UINT32                  AbsoluteOffset,
 195     char                    *Header)
 196 {
 197     UINT8                   *Buffer;
 198     UINT8                   BufChar;
 199     UINT32                  i;
 200     UINT32                  j;
 201
 202
 203     if (!Length)
 204     {
 205         return;
 206     }
 207
 208     Buffer = ACPI_CAST_PTR (UINT8, Table) + BufferOffset;
 209     i = 0;
 210
 211     while (i < Length)
 212     {
 213         if ((Length > 16) && (i != 0))
 214         {
 215         if ((Length - i) < 16)
 216             AcpiOsPrintf ("\n/* %3.3Xh %4.4u %3u */                            ", AbsoluteOffset, AbsoluteOffset, Length - i);
 217         else
 218             AcpiOsPrintf ("\n/* %3.3Xh %4.4u  16 */                            ", AbsoluteOffset, AbsoluteOffset);
 219         }
 220         AbsoluteOffset += 16;
 221
 222         /* Emit the raw data bytes*/
 223
 224         for (j = 0; j < 16; j++)
 225         {
 226             if (i + j >= Length)
 227             {
 228                 /* Dump fill spaces */
 229
 230                 AcpiOsPrintf ("%*s", (48 - (3 * (Length -i))), " ");
 231                 break;
 232             }
 233             AcpiOsPrintf ("%.02X ", Buffer[(ACPI_SIZE) i + j]);
 234         }
 235
 236         /* Emit the ASCII equivalent to the raw data bytes */
 237
 238         for (j = 0; j < 16; j++)
 239         {
 240             if (i + j >= Length)
 241             {
 242                 AcpiOsPrintf (" */\\\n");
 243                 return;
 244             }
 245
 246             /*
 247              * Add comment characters so rest of line is ignored when
 248              * compiled
 249              */
 250             if (j == 0)
 251             {
 252                 AcpiOsPrintf ("/* ");
 253             }
 254
 255             BufChar = Buffer[(ACPI_SIZE) i + j];
 256             if (isprint (BufChar))
 257             {
 258                 AcpiOsPrintf ("%c", BufChar);
 259             }
 260             else
 261             {
 262                 AcpiOsPrintf (".");
 263             }
 264         }
 265
 266         /* Done with that line. */
 267         /* Close the comment and insert a backslash - line continuation character */
 268
 269         if (Length > 16)
 270         {
 271             AcpiOsPrintf (" */\\");
 272         }
 273         else
 274         {
 275             AcpiOsPrintf (" */\\");
 276         }
 277
 278         i += 16; /* Point to next line */
 279     }
 280
 281     AcpiOsPrintf ("\n");
 282 }
 283
 284
 285 /*******************************************************************************
 286  *
 287  * FUNCTION:    AcpiDmDumpUnicode
 288  *
 289  * PARAMETERS:  Table               - ACPI Table or subtable
 290  *              BufferOffset        - Offset of buffer from Table above
 291  *              ByteLength          - Length of the buffer
 292  *
 293  * RETURN:      None
 294  *
 295  * DESCRIPTION: Validate and dump the contents of a buffer that contains
 296  *              unicode data. The output is a standard ASCII string. If it
 297  *              appears that the data is not unicode, the buffer is dumped
 298  *              as hex characters.
 299  *
 300  ******************************************************************************/
 301
 302 void
 303 AcpiDmDumpUnicode (
 304     void                    *Table,
 305     UINT32                  BufferOffset,
 306     UINT32                  ByteLength)
 307 {
 308     UINT8                   *Buffer;
 309     UINT32                  Length;
 310     UINT32                  i;
 311
 312
 313     Buffer = ((UINT8 *) Table) + BufferOffset;
 314     Length = ByteLength - 2; /* Last two bytes are the null terminator */
 315
 316     /* Ensure all low bytes are entirely printable ASCII */
 317
 318     for (i = 0; i < Length; i += 2)
 319     {
 320         if (!isprint (Buffer[i]))
 321         {
 322             goto DumpRawBuffer;
 323         }
 324     }
 325
 326     /* Ensure all high bytes are zero */
 327
 328     for (i = 1; i < Length; i += 2)
 329     {
 330         if (Buffer[i])
 331         {
 332             goto DumpRawBuffer;
 333         }
 334     }
 335
 336     /* Dump the buffer as a normal string */
 337
 338     AcpiOsPrintf ("\"");
 339     for (i = 0; i < Length; i += 2)
 340     {
 341         AcpiOsPrintf ("%c", Buffer[i]);
 342     }
 343
 344     AcpiOsPrintf ("\"\n");
 345     return;
 346
 347 DumpRawBuffer:
 348     AcpiDmDumpBuffer (Table, BufferOffset, ByteLength,
 349         BufferOffset, NULL);
 350     AcpiOsPrintf ("\n");
 351 }
 352
 353
 354 /*******************************************************************************
 355  *
 356  * FUNCTION:    AcpiDmDumpRsdp
 357  *
 358  * PARAMETERS:  Table               - A RSDP
 359  *
 360  * RETURN:      Length of the table (there is not always a length field,
 361  *              use revision or length if available (ACPI 2.0+))
 362  *
 363  * DESCRIPTION: Format the contents of a RSDP
 364  *
 365  ******************************************************************************/
 366
 367 UINT32
 368 AcpiDmDumpRsdp (
 369     ACPI_TABLE_HEADER       *Table)
 370 {
 371     ACPI_TABLE_RSDP         *Rsdp = ACPI_CAST_PTR (ACPI_TABLE_RSDP, Table);
 372     UINT32                  Length = sizeof (ACPI_RSDP_COMMON);
 373     UINT8                   Checksum;
 374     ACPI_STATUS             Status;
 375
 376
 377     /* Dump the common ACPI 1.0 portion */
 378
 379     Status = AcpiDmDumpTable (Length, 0, Table, 0, AcpiDmTableInfoRsdp1);
 380     if (ACPI_FAILURE (Status))
 381     {
 382         return (Length);
 383     }
 384
 385     /* Validate the first checksum */
 386
 387     Checksum = AcpiDmGenerateChecksum (Rsdp, sizeof (ACPI_RSDP_COMMON),
 388         Rsdp->Checksum);
 389     if (Checksum != Rsdp->Checksum)
 390     {
 391         AcpiOsPrintf ("/* Incorrect Checksum above, should be 0x%2.2X */\n",
 392             Checksum);
 393     }
 394
 395     /* The RSDP for ACPI 2.0+ contains more data and has a Length field */
 396
 397     if (Rsdp->Revision > 0)
 398     {
 399         Length = Rsdp->Length;
 400         Status = AcpiDmDumpTable (Length, 0, Table, 0, AcpiDmTableInfoRsdp2);
 401         if (ACPI_FAILURE (Status))
 402         {
 403             return (Length);
 404         }
 405
 406         /* Validate the extended checksum over entire RSDP */
 407
 408         Checksum = AcpiDmGenerateChecksum (Rsdp, sizeof (ACPI_TABLE_RSDP),
 409             Rsdp->ExtendedChecksum);
 410         if (Checksum != Rsdp->ExtendedChecksum)
 411         {
 412             AcpiOsPrintf (
 413                 "/* Incorrect Extended Checksum above, should be 0x%2.2X */\n",
 414                 Checksum);
 415         }
 416     }
 417
 418     return (Length);
 419 }
 420
 421
 422 /*******************************************************************************
 423  *
 424  * FUNCTION:    AcpiDmDumpRsdt
 425  *
 426  * PARAMETERS:  Table               - A RSDT
 427  *
 428  * RETURN:      None
 429  *
 430  * DESCRIPTION: Format the contents of a RSDT
 431  *
 432  ******************************************************************************/
 433
 434 void
 435 AcpiDmDumpRsdt (
 436     ACPI_TABLE_HEADER       *Table)
 437 {
 438     UINT32                  *Array;
 439     UINT32                  Entries;
 440     UINT32                  Offset;
 441     UINT32                  i;
 442
 443
 444     /* Point to start of table pointer array */
 445
 446     Array = ACPI_CAST_PTR (ACPI_TABLE_RSDT, Table)->TableOffsetEntry;
 447     Offset = sizeof (ACPI_TABLE_HEADER);
 448
 449     /* RSDT uses 32-bit pointers */
 450
 451     Entries = (Table->Length - sizeof (ACPI_TABLE_HEADER)) / sizeof (UINT32);
 452
 453     for (i = 0; i < Entries; i++)
 454     {
 455         AcpiDmLineHeader2 (Offset, sizeof (UINT32), "ACPI Table Address", i);
 456         AcpiOsPrintf ("%8.8X\n", Array[i]);
 457         Offset += sizeof (UINT32);
 458     }
 459 }
 460
 461
 462 /*******************************************************************************
 463  *
 464  * FUNCTION:    AcpiDmDumpXsdt
 465  *
 466  * PARAMETERS:  Table               - A XSDT
 467  *
 468  * RETURN:      None
 469  *
 470  * DESCRIPTION: Format the contents of a XSDT
 471  *
 472  ******************************************************************************/
 473
 474 void
 475 AcpiDmDumpXsdt (
 476     ACPI_TABLE_HEADER       *Table)
 477 {
 478     UINT64                  *Array;
 479     UINT32                  Entries;
 480     UINT32                  Offset;
 481     UINT32                  i;
 482
 483
 484     /* Point to start of table pointer array */
 485
 486     Array = ACPI_CAST_PTR (ACPI_TABLE_XSDT, Table)->TableOffsetEntry;
 487     Offset = sizeof (ACPI_TABLE_HEADER);
 488
 489     /* XSDT uses 64-bit pointers */
 490
 491     Entries = (Table->Length - sizeof (ACPI_TABLE_HEADER)) / sizeof (UINT64);
 492
 493     for (i = 0; i < Entries; i++)
 494     {
 495         AcpiDmLineHeader2 (Offset, sizeof (UINT64), "ACPI Table Address", i);
 496         AcpiOsPrintf ("%8.8X%8.8X\n", ACPI_FORMAT_UINT64 (Array[i]));
 497         Offset += sizeof (UINT64);
 498     }
 499 }
 500
 501
 502 /*******************************************************************************
 503  *
 504  * FUNCTION:    AcpiDmDumpFadt
 505  *
 506  * PARAMETERS:  Table               - A FADT
 507  *
 508  * RETURN:      None
 509  *
 510  * DESCRIPTION: Format the contents of a FADT
 511  *
 512  * NOTE:        We cannot depend on the FADT version to indicate the actual
 513  *              contents of the FADT because of BIOS bugs. The table length
 514  *              is the only reliable indicator.
 515  *
 516  ******************************************************************************/
 517
 518 void
 519 AcpiDmDumpFadt (
 520     ACPI_TABLE_HEADER       *Table)
 521 {
 522     ACPI_STATUS             Status;
 523
 524
 525     /* Always dump the minimum FADT revision 1 fields (ACPI 1.0) */
 526
 527     Status = AcpiDmDumpTable (Table->Length, 0, Table, 0,
 528         AcpiDmTableInfoFadt1);
 529     if (ACPI_FAILURE (Status))
 530     {
 531         return;
 532     }
 533
 534     /* Check for FADT revision 2 fields (ACPI 1.0B MS extensions) */
 535
 536     if ((Table->Length > ACPI_FADT_V1_SIZE) &&
 537         (Table->Length <= ACPI_FADT_V2_SIZE))
 538     {
 539         Status = AcpiDmDumpTable (Table->Length, 0, Table, 0,
 540             AcpiDmTableInfoFadt2);
 541         if (ACPI_FAILURE (Status))
 542         {
 543             return;
 544         }
 545     }
 546
 547     /* Check for FADT revision 3/4 fields and up (ACPI 2.0+ extended data) */
 548
 549     else if (Table->Length > ACPI_FADT_V2_SIZE)
 550     {
 551         Status = AcpiDmDumpTable (Table->Length, 0, Table, 0,
 552             AcpiDmTableInfoFadt3);
 553         if (ACPI_FAILURE (Status))
 554         {
 555             return;
 556         }
 557
 558         /* Check for FADT revision 5 fields and up (ACPI 5.0+) */
 559
 560         if (Table->Length > ACPI_FADT_V3_SIZE)
 561         {
 562             Status = AcpiDmDumpTable (Table->Length, 0, Table, 0,
 563                 AcpiDmTableInfoFadt5);
 564             if (ACPI_FAILURE (Status))
 565             {
 566                 return;
 567             }
 568         }
 569
 570         /* Check for FADT revision 6 fields and up (ACPI 6.0+) */
 571
 572         if (Table->Length > ACPI_FADT_V3_SIZE)
 573         {
 574             Status = AcpiDmDumpTable (Table->Length, 0, Table, 0,
 575                 AcpiDmTableInfoFadt6);
 576             if (ACPI_FAILURE (Status))
 577             {
 578                 return;
 579             }
 580         }
 581     }
 582
 583     /* Validate various fields in the FADT, including length */
 584
 585     AcpiTbCreateLocalFadt (Table, Table->Length);
 586
 587     /* Validate FADT length against the revision */
 588
 589     AcpiDmValidateFadtLength (Table->Revision, Table->Length);
 590 }
 591
 592
 593 /*******************************************************************************
 594  *
 595  * FUNCTION:    AcpiDmValidateFadtLength
 596  *
 597  * PARAMETERS:  Revision            - FADT revision (Header->Revision)
 598  *              Length              - FADT length (Header->Length
 599  *
 600  * RETURN:      None
 601  *
 602  * DESCRIPTION: Check the FADT revision against the expected table length for
 603  *              that revision. Issue a warning if the length is not what was
 604  *              expected. This seems to be such a common BIOS bug that the
 605  *              FADT revision has been rendered virtually meaningless.
 606  *
 607  ******************************************************************************/
 608
 609 static void
 610 AcpiDmValidateFadtLength (
 611     UINT32                  Revision,
 612     UINT32                  Length)
 613 {
 614     UINT32                  ExpectedLength;
 615
 616
 617     switch (Revision)
 618     {
 619     case 0:
 620
 621         AcpiOsPrintf ("// ACPI Warning: Invalid FADT revision: 0\n");
 622         return;
 623
 624     case 1:
 625
 626         ExpectedLength = ACPI_FADT_V1_SIZE;
 627         break;
 628
 629     case 2:
 630
 631         ExpectedLength = ACPI_FADT_V2_SIZE;
 632         break;
 633
 634     case 3:
 635     case 4:
 636
 637         ExpectedLength = ACPI_FADT_V3_SIZE;
 638         break;
 639
 640     case 5:
 641
 642         ExpectedLength = ACPI_FADT_V5_SIZE;
 643         break;
 644
 645     default:
 646
 647         return;
 648     }
 649
 650     if (Length == ExpectedLength)
 651     {
 652         return;
 653     }
 654
 655     AcpiOsPrintf (
 656         "\n// ACPI Warning: FADT revision %X does not match length: "
 657         "found %X expected %X\n",
 658         Revision, Length, ExpectedLength);
 659 }