sys/contrib/dev/acpica-unix-20061109/compiler/asllength.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: asllength - Tree walk to determine package and opcode lengths
   5  *              $Revision: 1.36 $
   6  *
   7  *****************************************************************************/
   8
   9 /******************************************************************************
  10  *
  11  * 1. Copyright Notice
  12  *
  13  * Some or all of this work - Copyright (c) 1999 - 2006, Intel Corp.
  14  * All rights reserved.
  15  *
  16  * 2. License
  17  *
  18  * 2.1. This is your license from Intel Corp. under its intellectual property
  19  * rights.  You may have additional license terms from the party that provided
  20  * you this software, covering your right to use that party's intellectual
  21  * property rights.
  22  *
  23  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  24  * copy of the source code appearing in this file ("Covered Code") an
  25  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  26  * base code distributed originally by Intel ("Original Intel Code") to copy,
  27  * make derivatives, distribute, use and display any portion of the Covered
  28  * Code in any form, with the right to sublicense such rights; and
  29  *
  30  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  31  * license (with the right to sublicense), under only those claims of Intel
  32  * patents that are infringed by the Original Intel Code, to make, use, sell,
  33  * offer to sell, and import the Covered Code and derivative works thereof
  34  * solely to the minimum extent necessary to exercise the above copyright
  35  * license, and in no event shall the patent license extend to any additions
  36  * to or modifications of the Original Intel Code.  No other license or right
  37  * is granted directly or by implication, estoppel or otherwise;
  38  *
  39  * The above copyright and patent license is granted only if the following
  40  * conditions are met:
  41  *
  42  * 3. Conditions
  43  *
  44  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  45  * Redistribution of source code of any substantial portion of the Covered
  46  * Code or modification with rights to further distribute source must include
  47  * the above Copyright Notice, the above License, this list of Conditions,
  48  * and the following Disclaimer and Export Compliance provision.  In addition,
  49  * Licensee must cause all Covered Code to which Licensee contributes to
  50  * contain a file documenting the changes Licensee made to create that Covered
  51  * Code and the date of any change.  Licensee must include in that file the
  52  * documentation of any changes made by any predecessor Licensee.  Licensee
  53  * must include a prominent statement that the modification is derived,
  54  * directly or indirectly, from Original Intel Code.
  55  *
  56  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  57  * Redistribution of source code of any substantial portion of the Covered
  58  * Code or modification without rights to further distribute source must
  59  * include the following Disclaimer and Export Compliance provision in the
  60  * documentation and/or other materials provided with distribution.  In
  61  * addition, Licensee may not authorize further sublicense of source of any
  62  * portion of the Covered Code, and must include terms to the effect that the
  63  * license from Licensee to its licensee is limited to the intellectual
  64  * property embodied in the software Licensee provides to its licensee, and
  65  * not to intellectual property embodied in modifications its licensee may
  66  * make.
  67  *
  68  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  69  * substantial portion of the Covered Code or modification must reproduce the
  70  * above Copyright Notice, and the following Disclaimer and Export Compliance
  71  * provision in the documentation and/or other materials provided with the
  72  * distribution.
  73  *
  74  * 3.4. Intel retains all right, title, and interest in and to the Original
  75  * Intel Code.
  76  *
  77  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  78  * Intel shall be used in advertising or otherwise to promote the sale, use or
  79  * other dealings in products derived from or relating to the Covered Code
  80  * without prior written authorization from Intel.
  81  *
  82  * 4. Disclaimer and Export Compliance
  83  *
  84  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  85  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  86  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  87  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  88  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  89  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  90  * PARTICULAR PURPOSE.
  91  *
  92  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  93  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  94  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  95  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  96  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  97  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  98  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  99  * LIMITED REMEDY.
 100  *
 101  * 4.3. Licensee shall not export, either directly or indirectly, any of this
 102  * software or system incorporating such software without first obtaining any
 103  * required license or other approval from the U. S. Department of Commerce or
 104  * any other agency or department of the United States Government.  In the
 105  * event Licensee exports any such software from the United States or
 106  * re-exports any such software from a foreign destination, Licensee shall
 107  * ensure that the distribution and export/re-export of the software is in
 108  * compliance with all laws, regulations, orders, or other restrictions of the
 109  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 110  * any of its subsidiaries will export/re-export any technical data, process,
 111  * software, or service, directly or indirectly, to any country for which the
 112  * United States government or any agency thereof requires an export license,
 113  * other governmental approval, or letter of assurance, without first obtaining
 114  * such license, approval or letter.
 115  *
 116  *****************************************************************************/
 117
 118
 119 #include "aslcompiler.h"
 120 #include "aslcompiler.y.h"
 121 #include "amlcode.h"
 122
 123
 124 #define _COMPONENT          ACPI_COMPILER
 125         ACPI_MODULE_NAME    ("asllength")
 126
 127 /* Local prototypes */
 128
 129 static UINT8
 130 CgGetPackageLenByteCount (
 131     ACPI_PARSE_OBJECT       *Op,
 132     UINT32                  PackageLength);
 133
 134 static void
 135 CgGenerateAmlOpcodeLength (
 136     ACPI_PARSE_OBJECT       *Op);
 137
 138
 139 #ifdef ACPI_OBSOLETE_FUNCTIONS
 140 void
 141 LnAdjustLengthToRoot (
 142     ACPI_PARSE_OBJECT       *Op,
 143     UINT32                  LengthDelta);
 144 #endif
 145
 146
 147 /*******************************************************************************
 148  *
 149  * FUNCTION:    LnInitLengthsWalk
 150  *
 151  * PARAMETERS:  ASL_WALK_CALLBACK
 152  *
 153  * RETURN:      Status
 154  *
 155  * DESCRIPTION: Walk callback to initialize (and re-initialize) the node
 156  *              subtree length(s) to zero.  The Subtree lengths are bubbled
 157  *              up to the root node in order to get a total AML length.
 158  *
 159  ******************************************************************************/
 160
 161 ACPI_STATUS
 162 LnInitLengthsWalk (
 163     ACPI_PARSE_OBJECT       *Op,
 164     UINT32                  Level,
 165     void                    *Context)
 166 {
 167
 168     Op->Asl.AmlSubtreeLength = 0;
 169     return (AE_OK);
 170 }
 171
 172
 173 /*******************************************************************************
 174  *
 175  * FUNCTION:    LnPackageLengthWalk
 176  *
 177  * PARAMETERS:  ASL_WALK_CALLBACK
 178  *
 179  * RETURN:      Status
 180  *
 181  * DESCRIPTION: Walk callback to calculate the total AML length.
 182  *              1) Calculate the AML lengths (opcode, package length, etc.) for
 183  *                 THIS node.
 184  *              2) Bubbble up all of these lengths to the parent node by summing
 185  *                 them all into the parent subtree length.
 186  *
 187  * Note:  The SubtreeLength represents the total AML length of all child nodes
 188  *        in all subtrees under a given node.  Therefore, once this walk is
 189  *        complete, the Root Node subtree length is the AML length of the entire
 190  *        tree (and thus, the entire ACPI table)
 191  *
 192  ******************************************************************************/
 193
 194 ACPI_STATUS
 195 LnPackageLengthWalk (
 196     ACPI_PARSE_OBJECT       *Op,
 197     UINT32                  Level,
 198     void                    *Context)
 199 {
 200
 201     /* Generate the AML lengths for this node */
 202
 203     CgGenerateAmlLengths (Op);
 204
 205     /* Bubble up all lengths (this node and all below it) to the parent */
 206
 207     if ((Op->Asl.Parent) &&
 208         (Op->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG))
 209     {
 210         Op->Asl.Parent->Asl.AmlSubtreeLength += (Op->Asl.AmlLength +
 211                                            Op->Asl.AmlOpcodeLength +
 212                                            Op->Asl.AmlPkgLenBytes +
 213                                            Op->Asl.AmlSubtreeLength);
 214     }
 215     return (AE_OK);
 216 }
 217
 218
 219 /*******************************************************************************
 220  *
 221  * FUNCTION:    CgGetPackageLenByteCount
 222  *
 223  * PARAMETERS:  Op              - Parse node
 224  *              PackageLength   - Length to be encoded
 225  *
 226  * RETURN:      Required length of the package length encoding
 227  *
 228  * DESCRIPTION: Calculate the number of bytes required to encode the given
 229  *              package length.
 230  *
 231  ******************************************************************************/
 232
 233 static UINT8
 234 CgGetPackageLenByteCount (
 235     ACPI_PARSE_OBJECT       *Op,
 236     UINT32                  PackageLength)
 237 {
 238
 239     /*
 240      * Determine the number of bytes required to encode the package length
 241      * Note: the package length includes the number of bytes used to encode
 242      * the package length, so we must account for this also.
 243      */
 244     if (PackageLength <= (0x0000003F - 1))
 245     {
 246         return (1);
 247     }
 248     else if (PackageLength <= (0x00000FFF - 2))
 249     {
 250         return (2);
 251     }
 252     else if (PackageLength <= (0x000FFFFF - 3))
 253     {
 254         return (3);
 255     }
 256     else if (PackageLength <= (0x0FFFFFFF - 4))
 257     {
 258         return (4);
 259     }
 260     else
 261     {
 262         /* Fatal error - the package length is too large to encode */
 263
 264         AslError (ASL_ERROR, ASL_MSG_ENCODING_LENGTH, Op, NULL);
 265     }
 266
 267     return (0);
 268 }
 269
 270
 271 /*******************************************************************************
 272  *
 273  * FUNCTION:    CgGenerateAmlOpcodeLength
 274  *
 275  * PARAMETERS:  Op          - Parse node whose AML opcode lengths will be
 276  *                            calculated
 277  *
 278  * RETURN:      None.
 279  *
 280  * DESCRIPTION: Calculate the AmlOpcodeLength, AmlPkgLenBytes, and AmlLength
 281  *              fields for this node.
 282  *
 283  ******************************************************************************/
 284
 285 static void
 286 CgGenerateAmlOpcodeLength (
 287     ACPI_PARSE_OBJECT       *Op)
 288 {
 289
 290     /* Check for two-byte opcode */
 291
 292     if (Op->Asl.AmlOpcode > 0x00FF)
 293     {
 294         Op->Asl.AmlOpcodeLength = 2;
 295     }
 296     else
 297     {
 298         Op->Asl.AmlOpcodeLength = 1;
 299     }
 300
 301     /* Does this opcode have an associated "PackageLength" field? */
 302
 303     Op->Asl.AmlPkgLenBytes = 0;
 304     if (Op->Asl.CompileFlags & NODE_AML_PACKAGE)
 305     {
 306         Op->Asl.AmlPkgLenBytes = CgGetPackageLenByteCount (
 307                                     Op, Op->Asl.AmlSubtreeLength);
 308     }
 309
 310     /* Data opcode lengths are easy */
 311
 312     switch (Op->Asl.AmlOpcode)
 313     {
 314     case AML_BYTE_OP:
 315
 316         Op->Asl.AmlLength = 1;
 317         break;
 318
 319     case AML_WORD_OP:
 320
 321         Op->Asl.AmlLength = 2;
 322         break;
 323
 324     case AML_DWORD_OP:
 325
 326         Op->Asl.AmlLength = 4;
 327         break;
 328
 329     case AML_QWORD_OP:
 330
 331         Op->Asl.AmlLength = 8;
 332         break;
 333
 334     default:
 335         /* All data opcodes must be above */
 336         break;
 337     }
 338 }
 339
 340
 341 /*******************************************************************************
 342  *
 343  * FUNCTION:    CgGenerateAmlLengths
 344  *
 345  * PARAMETERS:  Op        - Parse node
 346  *
 347  * RETURN:      None.
 348  *
 349  * DESCRIPTION: Generate internal length fields based on the AML opcode or
 350  *              parse opcode.
 351  *
 352  ******************************************************************************/
 353
 354 void
 355 CgGenerateAmlLengths (
 356     ACPI_PARSE_OBJECT       *Op)
 357 {
 358     char                    *Buffer;
 359     ACPI_STATUS             Status;
 360
 361
 362     switch (Op->Asl.AmlOpcode)
 363     {
 364     case AML_RAW_DATA_BYTE:
 365
 366         Op->Asl.AmlOpcodeLength = 0;
 367         Op->Asl.AmlLength = 1;
 368         return;
 369
 370     case AML_RAW_DATA_WORD:
 371
 372         Op->Asl.AmlOpcodeLength = 0;
 373         Op->Asl.AmlLength = 2;
 374         return;
 375
 376     case AML_RAW_DATA_DWORD:
 377
 378         Op->Asl.AmlOpcodeLength = 0;
 379         Op->Asl.AmlLength = 4;
 380         return;
 381
 382     case AML_RAW_DATA_QWORD:
 383
 384         Op->Asl.AmlOpcodeLength = 0;
 385         Op->Asl.AmlLength = 8;
 386         return;
 387
 388     case AML_RAW_DATA_BUFFER:
 389
 390         /* Aml length is/was set by creator */
 391
 392         Op->Asl.AmlOpcodeLength = 0;
 393         return;
 394
 395     case AML_RAW_DATA_CHAIN:
 396
 397         /* Aml length is/was set by creator */
 398
 399         Op->Asl.AmlOpcodeLength = 0;
 400         return;
 401
 402     default:
 403         break;
 404     }
 405
 406     switch (Op->Asl.ParseOpcode)
 407     {
 408     case PARSEOP_DEFINITIONBLOCK:
 409
 410         Gbl_TableLength = sizeof (ACPI_TABLE_HEADER) +
 411                             Op->Asl.AmlSubtreeLength;
 412         break;
 413
 414     case PARSEOP_NAMESEG:
 415
 416         Op->Asl.AmlOpcodeLength = 0;
 417         Op->Asl.AmlLength = 4;
 418         Op->Asl.ExternalName = Op->Asl.Value.String;
 419         break;
 420
 421     case PARSEOP_NAMESTRING:
 422     case PARSEOP_METHODCALL:
 423
 424         if (Op->Asl.CompileFlags & NODE_NAME_INTERNALIZED)
 425         {
 426             break;
 427         }
 428
 429         Op->Asl.AmlOpcodeLength = 0;
 430         Status = UtInternalizeName (Op->Asl.Value.String, &Buffer);
 431         if (ACPI_FAILURE (Status))
 432         {
 433             DbgPrint (ASL_DEBUG_OUTPUT,
 434                 "Failure from internalize name %X\n", Status);
 435             break;
 436         }
 437
 438         Op->Asl.ExternalName = Op->Asl.Value.String;
 439         Op->Asl.Value.String = Buffer;
 440         Op->Asl.CompileFlags |= NODE_NAME_INTERNALIZED;
 441
 442         Op->Asl.AmlLength = strlen (Buffer);
 443
 444         /*
 445          * Check for single backslash reference to root,
 446          * make it a null terminated string in the AML
 447          */
 448         if (Op->Asl.AmlLength == 1)
 449         {
 450             Op->Asl.AmlLength = 2;
 451         }
 452         break;
 453
 454     case PARSEOP_STRING_LITERAL:
 455
 456         Op->Asl.AmlOpcodeLength = 1;
 457
 458         /* Get null terminator */
 459
 460         Op->Asl.AmlLength = strlen (Op->Asl.Value.String) + 1;
 461         break;
 462
 463     case PARSEOP_PACKAGE_LENGTH:
 464
 465         Op->Asl.AmlOpcodeLength = 0;
 466         Op->Asl.AmlPkgLenBytes = CgGetPackageLenByteCount (Op,
 467                                     (UINT32) Op->Asl.Value.Integer);
 468         break;
 469
 470     case PARSEOP_RAW_DATA:
 471
 472         Op->Asl.AmlOpcodeLength = 0;
 473         break;
 474
 475     case PARSEOP_DEFAULT_ARG:
 476     case PARSEOP_EXTERNAL:
 477     case PARSEOP_INCLUDE:
 478     case PARSEOP_INCLUDE_END:
 479
 480         /* Ignore the "default arg" nodes, they are extraneous at this point */
 481
 482         break;
 483
 484     default:
 485
 486         CgGenerateAmlOpcodeLength (Op);
 487         break;
 488     }
 489 }
 490
 491
 492 #ifdef ACPI_OBSOLETE_FUNCTIONS
 493 /*******************************************************************************
 494  *
 495  * FUNCTION:    LnAdjustLengthToRoot
 496  *
 497  * PARAMETERS:  Op      - Node whose Length was changed
 498  *
 499  * RETURN:      None.
 500  *
 501  * DESCRIPTION: Change the Subtree length of the given node, and bubble the
 502  *              change all the way up to the root node.  This allows for
 503  *              last second changes to a package length (for example, if the
 504  *              package length encoding gets shorter or longer.)
 505  *
 506  ******************************************************************************/
 507
 508 void
 509 LnAdjustLengthToRoot (
 510     ACPI_PARSE_OBJECT       *SubtreeOp,
 511     UINT32                  LengthDelta)
 512 {
 513     ACPI_PARSE_OBJECT       *Op;
 514
 515
 516     /* Adjust all subtree lengths up to the root */
 517
 518     Op = SubtreeOp->Asl.Parent;
 519     while (Op)
 520     {
 521         Op->Asl.AmlSubtreeLength -= LengthDelta;
 522         Op = Op->Asl.Parent;
 523     }
 524
 525     /* Adjust the global table length */
 526
 527     Gbl_TableLength -= LengthDelta;
 528 }
 529 #endif
 530
 531