sys/contrib/dev/acpica/source/compiler/dtfield.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dtfield.c - Code generation for individual source fields
   4  *
   5  *****************************************************************************/
   6
   7 /******************************************************************************
   8  *
   9  * 1. Copyright Notice
  10  *
  11  * Some or all of this work - Copyright (c) 1999 - 2018, 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 "aslcompiler.h"
 153
 154 #define _COMPONENT          DT_COMPILER
 155         ACPI_MODULE_NAME    ("dtfield")
 156
 157
 158 /* Local prototypes */
 159
 160 static void
 161 DtCompileString (
 162     UINT8                   *Buffer,
 163     DT_FIELD                *Field,
 164     UINT32                  ByteLength);
 165
 166 static void
 167 DtCompileUnicode (
 168     UINT8                   *Buffer,
 169     DT_FIELD                *Field,
 170     UINT32                  ByteLength);
 171
 172 static ACPI_STATUS
 173 DtCompileUuid (
 174     UINT8                   *Buffer,
 175     DT_FIELD                *Field,
 176     UINT32                  ByteLength);
 177
 178 static char *
 179 DtNormalizeBuffer (
 180     char                    *Buffer,
 181     UINT32                  *Count);
 182
 183
 184 /******************************************************************************
 185  *
 186  * FUNCTION:    DtCompileOneField
 187  *
 188  * PARAMETERS:  Buffer              - Output buffer
 189  *              Field               - Field to be compiled
 190  *              ByteLength          - Byte length of the field
 191  *              Type                - Field type
 192  *
 193  * RETURN:      None
 194  *
 195  * DESCRIPTION: Compile a field value to binary
 196  *
 197  *****************************************************************************/
 198
 199 void
 200 DtCompileOneField (
 201     UINT8                   *Buffer,
 202     DT_FIELD                *Field,
 203     UINT32                  ByteLength,
 204     UINT8                   Type,
 205     UINT8                   Flags)
 206 {
 207     ACPI_STATUS             Status;
 208
 209
 210     switch (Type)
 211     {
 212     case DT_FIELD_TYPE_INTEGER:
 213
 214         DtCompileInteger (Buffer, Field, ByteLength, Flags);
 215         break;
 216
 217     case DT_FIELD_TYPE_STRING:
 218
 219         DtCompileString (Buffer, Field, ByteLength);
 220         break;
 221
 222     case DT_FIELD_TYPE_UUID:
 223
 224         Status = DtCompileUuid (Buffer, Field, ByteLength);
 225         if (ACPI_SUCCESS (Status))
 226         {
 227             break;
 228         }
 229
 230         /* Fall through. */
 231
 232     case DT_FIELD_TYPE_BUFFER:
 233
 234         DtCompileBuffer (Buffer, Field->Value, Field, ByteLength);
 235         break;
 236
 237     case DT_FIELD_TYPE_UNICODE:
 238
 239         DtCompileUnicode (Buffer, Field, ByteLength);
 240         break;
 241
 242     case DT_FIELD_TYPE_DEVICE_PATH:
 243
 244         break;
 245
 246     default:
 247
 248         DtFatal (ASL_MSG_COMPILER_INTERNAL, Field, "Invalid field type");
 249         break;
 250     }
 251 }
 252
 253
 254 /******************************************************************************
 255  *
 256  * FUNCTION:    DtCompileString
 257  *
 258  * PARAMETERS:  Buffer              - Output buffer
 259  *              Field               - String to be copied to buffer
 260  *              ByteLength          - Maximum length of string
 261  *
 262  * RETURN:      None
 263  *
 264  * DESCRIPTION: Copy string to the buffer
 265  *
 266  *****************************************************************************/
 267
 268 static void
 269 DtCompileString (
 270     UINT8                   *Buffer,
 271     DT_FIELD                *Field,
 272     UINT32                  ByteLength)
 273 {
 274     UINT32                  Length;
 275
 276
 277     Length = strlen (Field->Value);
 278
 279     /* Check if the string is too long for the field */
 280
 281     if (Length > ByteLength)
 282     {
 283         sprintf (MsgBuffer, "Maximum %u characters", ByteLength);
 284         DtError (ASL_ERROR, ASL_MSG_STRING_LENGTH, Field, MsgBuffer);
 285         Length = ByteLength;
 286     }
 287
 288     memcpy (Buffer, Field->Value, Length);
 289 }
 290
 291
 292 /******************************************************************************
 293  *
 294  * FUNCTION:    DtCompileUnicode
 295  *
 296  * PARAMETERS:  Buffer              - Output buffer
 297  *              Field               - String to be copied to buffer
 298  *              ByteLength          - Maximum length of string
 299  *
 300  * RETURN:      None
 301  *
 302  * DESCRIPTION: Convert ASCII string to Unicode string
 303  *
 304  * Note:  The Unicode string is 16 bits per character, no leading signature,
 305  *        with a 16-bit terminating NULL.
 306  *
 307  *****************************************************************************/
 308
 309 static void
 310 DtCompileUnicode (
 311     UINT8                   *Buffer,
 312     DT_FIELD                *Field,
 313     UINT32                  ByteLength)
 314 {
 315     UINT32                  Count;
 316     UINT32                  i;
 317     char                    *AsciiString;
 318     UINT16                  *UnicodeString;
 319
 320
 321     AsciiString = Field->Value;
 322     UnicodeString = (UINT16 *) Buffer;
 323     Count = strlen (AsciiString) + 1;
 324
 325     /* Convert to Unicode string (including null terminator) */
 326
 327     for (i = 0; i < Count; i++)
 328     {
 329         UnicodeString[i] = (UINT16) AsciiString[i];
 330     }
 331 }
 332
 333
 334 /*******************************************************************************
 335  *
 336  * FUNCTION:    DtCompileUuid
 337  *
 338  * PARAMETERS:  Buffer              - Output buffer
 339  *              Field               - String to be copied to buffer
 340  *              ByteLength          - Maximum length of string
 341  *
 342  * RETURN:      None
 343  *
 344  * DESCRIPTION: Convert UUID string to 16-byte buffer
 345  *
 346  ******************************************************************************/
 347
 348 static ACPI_STATUS
 349 DtCompileUuid (
 350     UINT8                   *Buffer,
 351     DT_FIELD                *Field,
 352     UINT32                  ByteLength)
 353 {
 354     char                    *InString;
 355     ACPI_STATUS             Status;
 356
 357
 358     InString = Field->Value;
 359
 360     Status = AuValidateUuid (InString);
 361     if (ACPI_FAILURE (Status))
 362     {
 363         sprintf (MsgBuffer, "%s", Field->Value);
 364         DtNameError (ASL_ERROR, ASL_MSG_INVALID_UUID, Field, MsgBuffer);
 365     }
 366     else
 367     {
 368         AcpiUtConvertStringToUuid (InString, Buffer);
 369     }
 370
 371     return (Status);
 372 }
 373
 374
 375 /******************************************************************************
 376  *
 377  * FUNCTION:    DtCompileInteger
 378  *
 379  * PARAMETERS:  Buffer              - Output buffer
 380  *              Field               - Field obj with Integer to be compiled
 381  *              ByteLength          - Byte length of the integer
 382  *              Flags               - Additional compile info
 383  *
 384  * RETURN:      None
 385  *
 386  * DESCRIPTION: Compile an integer. Supports integer expressions with C-style
 387  *              operators.
 388  *
 389  *****************************************************************************/
 390
 391 void
 392 DtCompileInteger (
 393     UINT8                   *Buffer,
 394     DT_FIELD                *Field,
 395     UINT32                  ByteLength,
 396     UINT8                   Flags)
 397 {
 398     UINT64                  Value;
 399     UINT64                  MaxValue;
 400     ACPI_STATUS             Status;
 401
 402
 403     /* Output buffer byte length must be in range 1-8 */
 404
 405     if ((ByteLength > 8) || (ByteLength == 0))
 406     {
 407         DtFatal (ASL_MSG_COMPILER_INTERNAL, Field,
 408             "Invalid internal Byte length");
 409         return;
 410     }
 411
 412     /* Resolve integer expression to a single integer value */
 413
 414     Status = DtResolveIntegerExpression (Field, &Value);
 415     if (ACPI_FAILURE (Status))
 416     {
 417         return;
 418     }
 419
 420     /*
 421      * Ensure that reserved fields are set properly. Note: uses
 422      * the DT_NON_ZERO flag to indicate that the reserved value
 423      * must be exactly one. Otherwise, the value must be zero.
 424      * This is sufficient for now.
 425      */
 426
 427     /* TBD: Should use a flag rather than compare "Reserved" */
 428
 429     if (!strcmp (Field->Name, "Reserved"))
 430     {
 431         if (Flags & DT_NON_ZERO)
 432         {
 433             if (Value != 1)
 434             {
 435                 DtError (ASL_WARNING, ASL_MSG_RESERVED_VALUE, Field,
 436                     "Must be one, setting to one");
 437                 Value = 1;
 438             }
 439         }
 440         else if (Value != 0)
 441         {
 442             DtError (ASL_WARNING, ASL_MSG_RESERVED_VALUE, Field,
 443                 "Must be zero, setting to zero");
 444             Value = 0;
 445         }
 446     }
 447
 448     /* Check if the value must be non-zero */
 449
 450     else if ((Flags & DT_NON_ZERO) && (Value == 0))
 451     {
 452         DtError (ASL_ERROR, ASL_MSG_ZERO_VALUE, Field, NULL);
 453     }
 454
 455     /*
 456      * Generate the maximum value for the data type (ByteLength)
 457      * Note: construct chosen for maximum portability
 458      */
 459     MaxValue = ((UINT64) (-1)) >> (64 - (ByteLength * 8));
 460
 461     /* Validate that the input value is within range of the target */
 462
 463     if (Value > MaxValue)
 464     {
 465         sprintf (MsgBuffer, "%8.8X%8.8X - max %u bytes",
 466             ACPI_FORMAT_UINT64 (Value), ByteLength);
 467         DtError (ASL_ERROR, ASL_MSG_INTEGER_SIZE, Field, MsgBuffer);
 468     }
 469
 470     memcpy (Buffer, &Value, ByteLength);
 471     return;
 472 }
 473
 474
 475 /******************************************************************************
 476  *
 477  * FUNCTION:    DtNormalizeBuffer
 478  *
 479  * PARAMETERS:  Buffer              - Input buffer
 480  *              Count               - Output the count of hex numbers in
 481  *                                    the Buffer
 482  *
 483  * RETURN:      The normalized buffer, must be freed by caller
 484  *
 485  * DESCRIPTION: [1A,2B,3C,4D] or 1A, 2B, 3C, 4D will be normalized
 486  *              to 1A 2B 3C 4D
 487  *
 488  *****************************************************************************/
 489
 490 static char *
 491 DtNormalizeBuffer (
 492     char                    *Buffer,
 493     UINT32                  *Count)
 494 {
 495     char                    *NewBuffer;
 496     char                    *TmpBuffer;
 497     UINT32                  BufferCount = 0;
 498     BOOLEAN                 Separator = TRUE;
 499     char                    c;
 500
 501
 502     NewBuffer = UtLocalCalloc (strlen (Buffer) + 1);
 503     TmpBuffer = NewBuffer;
 504
 505     while ((c = *Buffer++))
 506     {
 507         switch (c)
 508         {
 509         /* Valid separators */
 510
 511         case '[':
 512         case ']':
 513         case ' ':
 514         case ',':
 515
 516             Separator = TRUE;
 517             break;
 518
 519         default:
 520
 521             if (Separator)
 522             {
 523                 /* Insert blank as the standard separator */
 524
 525                 if (NewBuffer[0])
 526                 {
 527                     *TmpBuffer++ = ' ';
 528                     BufferCount++;
 529                 }
 530
 531                 Separator = FALSE;
 532             }
 533
 534             *TmpBuffer++ = c;
 535             break;
 536         }
 537     }
 538
 539     *Count = BufferCount + 1;
 540     return (NewBuffer);
 541 }
 542
 543
 544 /******************************************************************************
 545  *
 546  * FUNCTION:    DtCompileBuffer
 547  *
 548  * PARAMETERS:  Buffer              - Output buffer
 549  *              StringValue         - Integer list to be compiled
 550  *              Field               - Current field object
 551  *              ByteLength          - Byte length of the integer list
 552  *
 553  * RETURN:      Count of remaining data in the input list
 554  *
 555  * DESCRIPTION: Compile and pack an integer list, for example
 556  *              "AA 1F 20 3B" ==> Buffer[] = {0xAA,0x1F,0x20,0x3B}
 557  *
 558  *****************************************************************************/
 559
 560 UINT32
 561 DtCompileBuffer (
 562     UINT8                   *Buffer,
 563     char                    *StringValue,
 564     DT_FIELD                *Field,
 565     UINT32                  ByteLength)
 566 {
 567     char                    *Substring;
 568     ACPI_STATUS             Status;
 569     UINT32                  Count;
 570     UINT32                  i;
 571
 572
 573     /* Allow several different types of value separators */
 574
 575     StringValue = DtNormalizeBuffer (StringValue, &Count);
 576     Substring = StringValue;
 577
 578     /* Each element of StringValue is now three chars (2 hex + 1 space) */
 579
 580     for (i = 0; i < Count; i++, Substring += 3)
 581     {
 582         /* Check for byte value too long */
 583
 584         if (*(&Substring[2]) &&
 585            (*(&Substring[2]) != ' '))
 586         {
 587             DtError (ASL_ERROR, ASL_MSG_BUFFER_ELEMENT, Field, Substring);
 588             goto Exit;
 589         }
 590
 591         /* Convert two ASCII characters to one hex byte */
 592
 593         Status = AcpiUtAsciiToHexByte (Substring, &Buffer[i]);
 594         if (ACPI_FAILURE (Status))
 595         {
 596             DtError (ASL_ERROR, ASL_MSG_BUFFER_ELEMENT, Field, Substring);
 597             goto Exit;
 598         }
 599     }
 600
 601 Exit:
 602     ACPI_FREE (StringValue);
 603     return (ByteLength - Count);
 604 }
 605
 606
 607 /******************************************************************************
 608  *
 609  * FUNCTION:    DtCompileFlag
 610  *
 611  * PARAMETERS:  Buffer                      - Output buffer
 612  *              Field                       - Field to be compiled
 613  *              Info                        - Flag info
 614  *
 615  * RETURN:      None
 616  *
 617  * DESCRIPTION: Compile a flag field. Handles flags up to 64 bits.
 618  *
 619  *****************************************************************************/
 620
 621 void
 622 DtCompileFlag (
 623     UINT8                   *Buffer,
 624     DT_FIELD                *Field,
 625     ACPI_DMTABLE_INFO       *Info)
 626 {
 627     UINT64                  Value = 0;
 628     UINT32                  BitLength = 1;
 629     UINT8                   BitPosition = 0;
 630
 631
 632     Value = AcpiUtImplicitStrtoul64 (Field->Value);
 633
 634     switch (Info->Opcode)
 635     {
 636     case ACPI_DMT_FLAG0:
 637     case ACPI_DMT_FLAG1:
 638     case ACPI_DMT_FLAG2:
 639     case ACPI_DMT_FLAG3:
 640     case ACPI_DMT_FLAG4:
 641     case ACPI_DMT_FLAG5:
 642     case ACPI_DMT_FLAG6:
 643     case ACPI_DMT_FLAG7:
 644
 645         BitPosition = Info->Opcode;
 646         BitLength = 1;
 647         break;
 648
 649     case ACPI_DMT_FLAGS0:
 650
 651         BitPosition = 0;
 652         BitLength = 2;
 653         break;
 654
 655
 656     case ACPI_DMT_FLAGS1:
 657
 658         BitPosition = 1;
 659         BitLength = 2;
 660         break;
 661
 662
 663     case ACPI_DMT_FLAGS2:
 664
 665         BitPosition = 2;
 666         BitLength = 2;
 667         break;
 668
 669     case ACPI_DMT_FLAGS4:
 670
 671         BitPosition = 4;
 672         BitLength = 2;
 673         break;
 674
 675     case ACPI_DMT_FLAGS4_0:
 676
 677         BitPosition = 0;
 678         BitLength = 4;
 679         break;
 680
 681     case ACPI_DMT_FLAGS4_4:
 682
 683         BitPosition = 4;
 684         BitLength = 4;
 685         break;
 686
 687     case ACPI_DMT_FLAGS4_8:
 688
 689         BitPosition = 8;
 690         BitLength = 4;
 691         break;
 692
 693     case ACPI_DMT_FLAGS4_12:
 694
 695         BitPosition = 12;
 696         BitLength = 4;
 697         break;
 698
 699     case ACPI_DMT_FLAGS16_16:
 700
 701         BitPosition = 16;
 702         BitLength = 16;
 703         break;
 704
 705     default:
 706
 707         DtFatal (ASL_MSG_COMPILER_INTERNAL, Field, "Invalid flag opcode");
 708         break;
 709     }
 710
 711     /* Check range of the input flag value */
 712
 713     if (Value >= ((UINT64) 1 << BitLength))
 714     {
 715         sprintf (MsgBuffer, "Maximum %u bit", BitLength);
 716         DtError (ASL_ERROR, ASL_MSG_FLAG_VALUE, Field, MsgBuffer);
 717         Value = 0;
 718     }
 719
 720     *Buffer |= (UINT8) (Value << BitPosition);
 721 }