usr/src/uts/intel/io/acpica/executer/exoparg1.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exoparg1 - AML execution - opcodes with 1 argument
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include "acpi.h"
  45 #include "accommon.h"
  46 #include "acparser.h"
  47 #include "acdispat.h"
  48 #include "acinterp.h"
  49 #include "amlcode.h"
  50 #include "acnamesp.h"
  51
  52
  53 #define _COMPONENT          ACPI_EXECUTER
  54         ACPI_MODULE_NAME    ("exoparg1")
  55
  56
  57 /*!
  58  * Naming convention for AML interpreter execution routines.
  59  *
  60  * The routines that begin execution of AML opcodes are named with a common
  61  * convention based upon the number of arguments, the number of target operands,
  62  * and whether or not a value is returned:
  63  *
  64  *      AcpiExOpcode_xA_yT_zR
  65  *
  66  * Where:
  67  *
  68  * xA - ARGUMENTS:    The number of arguments (input operands) that are
  69  *                    required for this opcode type (0 through 6 args).
  70  * yT - TARGETS:      The number of targets (output operands) that are required
  71  *                    for this opcode type (0, 1, or 2 targets).
  72  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
  73  *                    as the function return (0 or 1).
  74  *
  75  * The AcpiExOpcode* functions are called via the Dispatcher component with
  76  * fully resolved operands.
  77 !*/
  78
  79 /*******************************************************************************
  80  *
  81  * FUNCTION:    AcpiExOpcode_0A_0T_1R
  82  *
  83  * PARAMETERS:  WalkState           - Current state (contains AML opcode)
  84  *
  85  * RETURN:      Status
  86  *
  87  * DESCRIPTION: Execute operator with no operands, one return value
  88  *
  89  ******************************************************************************/
  90
  91 ACPI_STATUS
  92 AcpiExOpcode_0A_0T_1R (
  93     ACPI_WALK_STATE         *WalkState)
  94 {
  95     ACPI_STATUS             Status = AE_OK;
  96     ACPI_OPERAND_OBJECT     *ReturnDesc = NULL;
  97
  98
  99     ACPI_FUNCTION_TRACE_STR (ExOpcode_0A_0T_1R,
 100         AcpiPsGetOpcodeName (WalkState->Opcode));
 101
 102
 103     /* Examine the AML opcode */
 104
 105     switch (WalkState->Opcode)
 106     {
 107     case AML_TIMER_OP:      /*  Timer () */
 108
 109         /* Create a return object of type Integer */
 110
 111         ReturnDesc = AcpiUtCreateIntegerObject (AcpiOsGetTimer ());
 112         if (!ReturnDesc)
 113         {
 114             Status = AE_NO_MEMORY;
 115             goto Cleanup;
 116         }
 117         break;
 118
 119     default:                /*  Unknown opcode  */
 120
 121         ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
 122             WalkState->Opcode));
 123         Status = AE_AML_BAD_OPCODE;
 124         break;
 125     }
 126
 127 Cleanup:
 128
 129     /* Delete return object on error */
 130
 131     if ((ACPI_FAILURE (Status)) || WalkState->ResultObj)
 132     {
 133         AcpiUtRemoveReference (ReturnDesc);
 134         WalkState->ResultObj = NULL;
 135     }
 136     else
 137     {
 138         /* Save the return value */
 139
 140         WalkState->ResultObj = ReturnDesc;
 141     }
 142
 143     return_ACPI_STATUS (Status);
 144 }
 145
 146
 147 /*******************************************************************************
 148  *
 149  * FUNCTION:    AcpiExOpcode_1A_0T_0R
 150  *
 151  * PARAMETERS:  WalkState           - Current state (contains AML opcode)
 152  *
 153  * RETURN:      Status
 154  *
 155  * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
 156  *              object stack
 157  *
 158  ******************************************************************************/
 159
 160 ACPI_STATUS
 161 AcpiExOpcode_1A_0T_0R (
 162     ACPI_WALK_STATE         *WalkState)
 163 {
 164     ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
 165     ACPI_STATUS             Status = AE_OK;
 166
 167
 168     ACPI_FUNCTION_TRACE_STR (ExOpcode_1A_0T_0R,
 169         AcpiPsGetOpcodeName (WalkState->Opcode));
 170
 171
 172     /* Examine the AML opcode */
 173
 174     switch (WalkState->Opcode)
 175     {
 176     case AML_RELEASE_OP:    /*  Release (MutexObject) */
 177
 178         Status = AcpiExReleaseMutex (Operand[0], WalkState);
 179         break;
 180
 181     case AML_RESET_OP:      /*  Reset (EventObject) */
 182
 183         Status = AcpiExSystemResetEvent (Operand[0]);
 184         break;
 185
 186     case AML_SIGNAL_OP:     /*  Signal (EventObject) */
 187
 188         Status = AcpiExSystemSignalEvent (Operand[0]);
 189         break;
 190
 191     case AML_SLEEP_OP:      /*  Sleep (MsecTime) */
 192
 193         Status = AcpiExSystemDoSleep (Operand[0]->Integer.Value);
 194         break;
 195
 196     case AML_STALL_OP:      /*  Stall (UsecTime) */
 197
 198         Status = AcpiExSystemDoStall ((UINT32) Operand[0]->Integer.Value);
 199         break;
 200
 201     case AML_UNLOAD_OP:     /*  Unload (Handle) */
 202
 203         Status = AcpiExUnloadTable (Operand[0]);
 204         break;
 205
 206     default:                /*  Unknown opcode  */
 207
 208         ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
 209             WalkState->Opcode));
 210         Status = AE_AML_BAD_OPCODE;
 211         break;
 212     }
 213
 214     return_ACPI_STATUS (Status);
 215 }
 216
 217
 218 /*******************************************************************************
 219  *
 220  * FUNCTION:    AcpiExOpcode_1A_1T_0R
 221  *
 222  * PARAMETERS:  WalkState           - Current state (contains AML opcode)
 223  *
 224  * RETURN:      Status
 225  *
 226  * DESCRIPTION: Execute opcode with one argument, one target, and no
 227  *              return value.
 228  *
 229  ******************************************************************************/
 230
 231 ACPI_STATUS
 232 AcpiExOpcode_1A_1T_0R (
 233     ACPI_WALK_STATE         *WalkState)
 234 {
 235     ACPI_STATUS             Status = AE_OK;
 236     ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
 237
 238
 239     ACPI_FUNCTION_TRACE_STR (ExOpcode_1A_1T_0R,
 240         AcpiPsGetOpcodeName (WalkState->Opcode));
 241
 242
 243     /* Examine the AML opcode */
 244
 245     switch (WalkState->Opcode)
 246     {
 247     case AML_LOAD_OP:
 248
 249         Status = AcpiExLoadOp (Operand[0], Operand[1], WalkState);
 250         break;
 251
 252     default:                        /* Unknown opcode */
 253
 254         ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
 255             WalkState->Opcode));
 256         Status = AE_AML_BAD_OPCODE;
 257         goto Cleanup;
 258     }
 259
 260
 261 Cleanup:
 262
 263     return_ACPI_STATUS (Status);
 264 }
 265
 266
 267 /*******************************************************************************
 268  *
 269  * FUNCTION:    AcpiExOpcode_1A_1T_1R
 270  *
 271  * PARAMETERS:  WalkState           - Current state (contains AML opcode)
 272  *
 273  * RETURN:      Status
 274  *
 275  * DESCRIPTION: Execute opcode with one argument, one target, and a
 276  *              return value.
 277  *
 278  ******************************************************************************/
 279
 280 ACPI_STATUS
 281 AcpiExOpcode_1A_1T_1R (
 282     ACPI_WALK_STATE         *WalkState)
 283 {
 284     ACPI_STATUS             Status = AE_OK;
 285     ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
 286     ACPI_OPERAND_OBJECT     *ReturnDesc = NULL;
 287     ACPI_OPERAND_OBJECT     *ReturnDesc2 = NULL;
 288     UINT32                  Temp32;
 289     UINT32                  i;
 290     UINT64                  PowerOfTen;
 291     UINT64                  Digit;
 292
 293
 294     ACPI_FUNCTION_TRACE_STR (ExOpcode_1A_1T_1R,
 295         AcpiPsGetOpcodeName (WalkState->Opcode));
 296
 297
 298     /* Examine the AML opcode */
 299
 300     switch (WalkState->Opcode)
 301     {
 302     case AML_BIT_NOT_OP:
 303     case AML_FIND_SET_LEFT_BIT_OP:
 304     case AML_FIND_SET_RIGHT_BIT_OP:
 305     case AML_FROM_BCD_OP:
 306     case AML_TO_BCD_OP:
 307     case AML_COND_REF_OF_OP:
 308
 309         /* Create a return object of type Integer for these opcodes */
 310
 311         ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
 312         if (!ReturnDesc)
 313         {
 314             Status = AE_NO_MEMORY;
 315             goto Cleanup;
 316         }
 317
 318         switch (WalkState->Opcode)
 319         {
 320         case AML_BIT_NOT_OP:            /* Not (Operand, Result)  */
 321
 322             ReturnDesc->Integer.Value = ~Operand[0]->Integer.Value;
 323             break;
 324
 325         case AML_FIND_SET_LEFT_BIT_OP:  /* FindSetLeftBit (Operand, Result) */
 326
 327             ReturnDesc->Integer.Value = Operand[0]->Integer.Value;
 328
 329             /*
 330              * Acpi specification describes Integer type as a little
 331              * endian unsigned value, so this boundary condition is valid.
 332              */
 333             for (Temp32 = 0; ReturnDesc->Integer.Value &&
 334                     Temp32 < ACPI_INTEGER_BIT_SIZE; ++Temp32)
 335             {
 336                 ReturnDesc->Integer.Value >>= 1;
 337             }
 338
 339             ReturnDesc->Integer.Value = Temp32;
 340             break;
 341
 342         case AML_FIND_SET_RIGHT_BIT_OP: /* FindSetRightBit (Operand, Result) */
 343
 344             ReturnDesc->Integer.Value = Operand[0]->Integer.Value;
 345
 346             /*
 347              * The Acpi specification describes Integer type as a little
 348              * endian unsigned value, so this boundary condition is valid.
 349              */
 350             for (Temp32 = 0; ReturnDesc->Integer.Value &&
 351                      Temp32 < ACPI_INTEGER_BIT_SIZE; ++Temp32)
 352             {
 353                 ReturnDesc->Integer.Value <<= 1;
 354             }
 355
 356             /* Since the bit position is one-based, subtract from 33 (65) */
 357
 358             ReturnDesc->Integer.Value =
 359                 Temp32 == 0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - Temp32;
 360             break;
 361
 362         case AML_FROM_BCD_OP:           /* FromBcd (BCDValue, Result)  */
 363             /*
 364              * The 64-bit ACPI integer can hold 16 4-bit BCD characters
 365              * (if table is 32-bit, integer can hold 8 BCD characters)
 366              * Convert each 4-bit BCD value
 367              */
 368             PowerOfTen = 1;
 369             ReturnDesc->Integer.Value = 0;
 370             Digit = Operand[0]->Integer.Value;
 371
 372             /* Convert each BCD digit (each is one nybble wide) */
 373
 374             for (i = 0; (i < AcpiGbl_IntegerNybbleWidth) && (Digit > 0); i++)
 375             {
 376                 /* Get the least significant 4-bit BCD digit */
 377
 378                 Temp32 = ((UINT32) Digit) & 0xF;
 379
 380                 /* Check the range of the digit */
 381
 382                 if (Temp32 > 9)
 383                 {
 384                     ACPI_ERROR ((AE_INFO,
 385                         "BCD digit too large (not decimal): 0x%X",
 386                         Temp32));
 387
 388                     Status = AE_AML_NUMERIC_OVERFLOW;
 389                     goto Cleanup;
 390                 }
 391
 392                 /* Sum the digit into the result with the current power of 10 */
 393
 394                 ReturnDesc->Integer.Value +=
 395                     (((UINT64) Temp32) * PowerOfTen);
 396
 397                 /* Shift to next BCD digit */
 398
 399                 Digit >>= 4;
 400
 401                 /* Next power of 10 */
 402
 403                 PowerOfTen *= 10;
 404             }
 405             break;
 406
 407         case AML_TO_BCD_OP:             /* ToBcd (Operand, Result)  */
 408
 409             ReturnDesc->Integer.Value = 0;
 410             Digit = Operand[0]->Integer.Value;
 411
 412             /* Each BCD digit is one nybble wide */
 413
 414             for (i = 0; (i < AcpiGbl_IntegerNybbleWidth) && (Digit > 0); i++)
 415             {
 416                 (void) AcpiUtShortDivide (Digit, 10, &Digit, &Temp32);
 417
 418                 /*
 419                  * Insert the BCD digit that resides in the
 420                  * remainder from above
 421                  */
 422                 ReturnDesc->Integer.Value |=
 423                     (((UINT64) Temp32) << ACPI_MUL_4 (i));
 424             }
 425
 426             /* Overflow if there is any data left in Digit */
 427
 428             if (Digit > 0)
 429             {
 430                 ACPI_ERROR ((AE_INFO,
 431                     "Integer too large to convert to BCD: 0x%8.8X%8.8X",
 432                     ACPI_FORMAT_UINT64 (Operand[0]->Integer.Value)));
 433                 Status = AE_AML_NUMERIC_OVERFLOW;
 434                 goto Cleanup;
 435             }
 436             break;
 437
 438         case AML_COND_REF_OF_OP:        /* CondRefOf (SourceObject, Result)  */
 439             /*
 440              * This op is a little strange because the internal return value is
 441              * different than the return value stored in the result descriptor
 442              * (There are really two return values)
 443              */
 444             if ((ACPI_NAMESPACE_NODE *) Operand[0] == AcpiGbl_RootNode)
 445             {
 446                 /*
 447                  * This means that the object does not exist in the namespace,
 448                  * return FALSE
 449                  */
 450                 ReturnDesc->Integer.Value = 0;
 451                 goto Cleanup;
 452             }
 453
 454             /* Get the object reference, store it, and remove our reference */
 455
 456             Status = AcpiExGetObjectReference (Operand[0],
 457                 &ReturnDesc2, WalkState);
 458             if (ACPI_FAILURE (Status))
 459             {
 460                 goto Cleanup;
 461             }
 462
 463             Status = AcpiExStore (ReturnDesc2, Operand[1], WalkState);
 464             AcpiUtRemoveReference (ReturnDesc2);
 465
 466             /* The object exists in the namespace, return TRUE */
 467
 468             ReturnDesc->Integer.Value = ACPI_UINT64_MAX;
 469             goto Cleanup;
 470
 471
 472         default:
 473
 474             /* No other opcodes get here */
 475
 476             break;
 477         }
 478         break;
 479
 480     case AML_STORE_OP:              /* Store (Source, Target) */
 481         /*
 482          * A store operand is typically a number, string, buffer or lvalue
 483          * Be careful about deleting the source object,
 484          * since the object itself may have been stored.
 485          */
 486         Status = AcpiExStore (Operand[0], Operand[1], WalkState);
 487         if (ACPI_FAILURE (Status))
 488         {
 489             return_ACPI_STATUS (Status);
 490         }
 491
 492         /* It is possible that the Store already produced a return object */
 493
 494         if (!WalkState->ResultObj)
 495         {
 496             /*
 497              * Normally, we would remove a reference on the Operand[0]
 498              * parameter; But since it is being used as the internal return
 499              * object (meaning we would normally increment it), the two
 500              * cancel out, and we simply don't do anything.
 501              */
 502             WalkState->ResultObj = Operand[0];
 503             WalkState->Operands[0] = NULL;  /* Prevent deletion */
 504         }
 505         return_ACPI_STATUS (Status);
 506
 507     /*
 508      * ACPI 2.0 Opcodes
 509      */
 510     case AML_COPY_OP:               /* Copy (Source, Target) */
 511
 512         Status = AcpiUtCopyIobjectToIobject (
 513             Operand[0], &ReturnDesc, WalkState);
 514         break;
 515
 516     case AML_TO_DECSTRING_OP:       /* ToDecimalString (Data, Result) */
 517
 518         Status = AcpiExConvertToString (
 519             Operand[0], &ReturnDesc, ACPI_EXPLICIT_CONVERT_DECIMAL);
 520         if (ReturnDesc == Operand[0])
 521         {
 522             /* No conversion performed, add ref to handle return value */
 523
 524             AcpiUtAddReference (ReturnDesc);
 525         }
 526         break;
 527
 528     case AML_TO_HEXSTRING_OP:       /* ToHexString (Data, Result) */
 529
 530         Status = AcpiExConvertToString (
 531             Operand[0], &ReturnDesc, ACPI_EXPLICIT_CONVERT_HEX);
 532         if (ReturnDesc == Operand[0])
 533         {
 534             /* No conversion performed, add ref to handle return value */
 535
 536             AcpiUtAddReference (ReturnDesc);
 537         }
 538         break;
 539
 540     case AML_TO_BUFFER_OP:          /* ToBuffer (Data, Result) */
 541
 542         Status = AcpiExConvertToBuffer (Operand[0], &ReturnDesc);
 543         if (ReturnDesc == Operand[0])
 544         {
 545             /* No conversion performed, add ref to handle return value */
 546
 547             AcpiUtAddReference (ReturnDesc);
 548         }
 549         break;
 550
 551     case AML_TO_INTEGER_OP:         /* ToInteger (Data, Result) */
 552
 553         Status = AcpiExConvertToInteger (
 554             Operand[0], &ReturnDesc, ACPI_ANY_BASE);
 555         if (ReturnDesc == Operand[0])
 556         {
 557             /* No conversion performed, add ref to handle return value */
 558
 559             AcpiUtAddReference (ReturnDesc);
 560         }
 561         break;
 562
 563     case AML_SHIFT_LEFT_BIT_OP:     /* ShiftLeftBit (Source, BitNum)  */
 564     case AML_SHIFT_RIGHT_BIT_OP:    /* ShiftRightBit (Source, BitNum) */
 565
 566         /* These are two obsolete opcodes */
 567
 568         ACPI_ERROR ((AE_INFO,
 569             "%s is obsolete and not implemented",
 570             AcpiPsGetOpcodeName (WalkState->Opcode)));
 571         Status = AE_SUPPORT;
 572         goto Cleanup;
 573
 574     default:                        /* Unknown opcode */
 575
 576         ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
 577             WalkState->Opcode));
 578         Status = AE_AML_BAD_OPCODE;
 579         goto Cleanup;
 580     }
 581
 582     if (ACPI_SUCCESS (Status))
 583     {
 584         /* Store the return value computed above into the target object */
 585
 586         Status = AcpiExStore (ReturnDesc, Operand[1], WalkState);
 587     }
 588
 589
 590 Cleanup:
 591
 592     /* Delete return object on error */
 593
 594     if (ACPI_FAILURE (Status))
 595     {
 596         AcpiUtRemoveReference (ReturnDesc);
 597     }
 598
 599     /* Save return object on success */
 600
 601     else if (!WalkState->ResultObj)
 602     {
 603         WalkState->ResultObj = ReturnDesc;
 604     }
 605
 606     return_ACPI_STATUS (Status);
 607 }
 608
 609
 610 /*******************************************************************************
 611  *
 612  * FUNCTION:    AcpiExOpcode_1A_0T_1R
 613  *
 614  * PARAMETERS:  WalkState           - Current state (contains AML opcode)
 615  *
 616  * RETURN:      Status
 617  *
 618  * DESCRIPTION: Execute opcode with one argument, no target, and a return value
 619  *
 620  ******************************************************************************/
 621
 622 ACPI_STATUS
 623 AcpiExOpcode_1A_0T_1R (
 624     ACPI_WALK_STATE         *WalkState)
 625 {
 626     ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
 627     ACPI_OPERAND_OBJECT     *TempDesc;
 628     ACPI_OPERAND_OBJECT     *ReturnDesc = NULL;
 629     ACPI_STATUS             Status = AE_OK;
 630     UINT32                  Type;
 631     UINT64                  Value;
 632
 633
 634     ACPI_FUNCTION_TRACE_STR (ExOpcode_1A_0T_1R,
 635         AcpiPsGetOpcodeName (WalkState->Opcode));
 636
 637
 638     /* Examine the AML opcode */
 639
 640     switch (WalkState->Opcode)
 641     {
 642     case AML_LNOT_OP:               /* LNot (Operand) */
 643
 644         ReturnDesc = AcpiUtCreateIntegerObject ((UINT64) 0);
 645         if (!ReturnDesc)
 646         {
 647             Status = AE_NO_MEMORY;
 648             goto Cleanup;
 649         }
 650
 651         /*
 652          * Set result to ONES (TRUE) if Value == 0. Note:
 653          * ReturnDesc->Integer.Value is initially == 0 (FALSE) from above.
 654          */
 655         if (!Operand[0]->Integer.Value)
 656         {
 657             ReturnDesc->Integer.Value = ACPI_UINT64_MAX;
 658         }
 659         break;
 660
 661     case AML_DECREMENT_OP:          /* Decrement (Operand)  */
 662     case AML_INCREMENT_OP:          /* Increment (Operand)  */
 663         /*
 664          * Create a new integer. Can't just get the base integer and
 665          * increment it because it may be an Arg or Field.
 666          */
 667         ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
 668         if (!ReturnDesc)
 669         {
 670             Status = AE_NO_MEMORY;
 671             goto Cleanup;
 672         }
 673
 674         /*
 675          * Since we are expecting a Reference operand, it can be either a
 676          * NS Node or an internal object.
 677          */
 678         TempDesc = Operand[0];
 679         if (ACPI_GET_DESCRIPTOR_TYPE (TempDesc) == ACPI_DESC_TYPE_OPERAND)
 680         {
 681             /* Internal reference object - prevent deletion */
 682
 683             AcpiUtAddReference (TempDesc);
 684         }
 685
 686         /*
 687          * Convert the Reference operand to an Integer (This removes a
 688          * reference on the Operand[0] object)
 689          *
 690          * NOTE:  We use LNOT_OP here in order to force resolution of the
 691          * reference operand to an actual integer.
 692          */
 693         Status = AcpiExResolveOperands (AML_LNOT_OP, &TempDesc, WalkState);
 694         if (ACPI_FAILURE (Status))
 695         {
 696             ACPI_EXCEPTION ((AE_INFO, Status,
 697                 "While resolving operands for [%s]",
 698                 AcpiPsGetOpcodeName (WalkState->Opcode)));
 699
 700             goto Cleanup;
 701         }
 702
 703         /*
 704          * TempDesc is now guaranteed to be an Integer object --
 705          * Perform the actual increment or decrement
 706          */
 707         if (WalkState->Opcode == AML_INCREMENT_OP)
 708         {
 709             ReturnDesc->Integer.Value = TempDesc->Integer.Value + 1;
 710         }
 711         else
 712         {
 713             ReturnDesc->Integer.Value = TempDesc->Integer.Value - 1;
 714         }
 715
 716         /* Finished with this Integer object */
 717
 718         AcpiUtRemoveReference (TempDesc);
 719
 720         /*
 721          * Store the result back (indirectly) through the original
 722          * Reference object
 723          */
 724         Status = AcpiExStore (ReturnDesc, Operand[0], WalkState);
 725         break;
 726
 727     case AML_OBJECT_TYPE_OP:            /* ObjectType (SourceObject) */
 728         /*
 729          * Note: The operand is not resolved at this point because we want to
 730          * get the associated object, not its value. For example, we don't
 731          * want to resolve a FieldUnit to its value, we want the actual
 732          * FieldUnit object.
 733          */
 734
 735         /* Get the type of the base object */
 736
 737         Status = AcpiExResolveMultiple (WalkState, Operand[0], &Type, NULL);
 738         if (ACPI_FAILURE (Status))
 739         {
 740             goto Cleanup;
 741         }
 742
 743         /* Allocate a descriptor to hold the type. */
 744
 745         ReturnDesc = AcpiUtCreateIntegerObject ((UINT64) Type);
 746         if (!ReturnDesc)
 747         {
 748             Status = AE_NO_MEMORY;
 749             goto Cleanup;
 750         }
 751         break;
 752
 753     case AML_SIZE_OF_OP:            /* SizeOf (SourceObject)  */
 754         /*
 755          * Note: The operand is not resolved at this point because we want to
 756          * get the associated object, not its value.
 757          */
 758
 759         /* Get the base object */
 760
 761         Status = AcpiExResolveMultiple (
 762             WalkState, Operand[0], &Type, &TempDesc);
 763         if (ACPI_FAILURE (Status))
 764         {
 765             goto Cleanup;
 766         }
 767
 768         /*
 769          * The type of the base object must be integer, buffer, string, or
 770          * package. All others are not supported.
 771          *
 772          * NOTE: Integer is not specifically supported by the ACPI spec,
 773          * but is supported implicitly via implicit operand conversion.
 774          * rather than bother with conversion, we just use the byte width
 775          * global (4 or 8 bytes).
 776          */
 777         switch (Type)
 778         {
 779         case ACPI_TYPE_INTEGER:
 780
 781             Value = AcpiGbl_IntegerByteWidth;
 782             break;
 783
 784         case ACPI_TYPE_STRING:
 785
 786             Value = TempDesc->String.Length;
 787             break;
 788
 789         case ACPI_TYPE_BUFFER:
 790
 791             /* Buffer arguments may not be evaluated at this point */
 792
 793             Status = AcpiDsGetBufferArguments (TempDesc);
 794             Value = TempDesc->Buffer.Length;
 795             break;
 796
 797         case ACPI_TYPE_PACKAGE:
 798
 799             /* Package arguments may not be evaluated at this point */
 800
 801             Status = AcpiDsGetPackageArguments (TempDesc);
 802             Value = TempDesc->Package.Count;
 803             break;
 804
 805         default:
 806
 807             ACPI_ERROR ((AE_INFO,
 808                 "Operand must be Buffer/Integer/String/Package"
 809                 " - found type %s",
 810                 AcpiUtGetTypeName (Type)));
 811
 812             Status = AE_AML_OPERAND_TYPE;
 813             goto Cleanup;
 814         }
 815
 816         if (ACPI_FAILURE (Status))
 817         {
 818             goto Cleanup;
 819         }
 820
 821         /*
 822          * Now that we have the size of the object, create a result
 823          * object to hold the value
 824          */
 825         ReturnDesc = AcpiUtCreateIntegerObject (Value);
 826         if (!ReturnDesc)
 827         {
 828             Status = AE_NO_MEMORY;
 829             goto Cleanup;
 830         }
 831         break;
 832
 833
 834     case AML_REF_OF_OP:             /* RefOf (SourceObject) */
 835
 836         Status = AcpiExGetObjectReference (
 837             Operand[0], &ReturnDesc, WalkState);
 838         if (ACPI_FAILURE (Status))
 839         {
 840             goto Cleanup;
 841         }
 842         break;
 843
 844
 845     case AML_DEREF_OF_OP:           /* DerefOf (ObjReference | String) */
 846
 847         /* Check for a method local or argument, or standalone String */
 848
 849         if (ACPI_GET_DESCRIPTOR_TYPE (Operand[0]) == ACPI_DESC_TYPE_NAMED)
 850         {
 851             TempDesc = AcpiNsGetAttachedObject (
 852                            (ACPI_NAMESPACE_NODE *) Operand[0]);
 853             if (TempDesc &&
 854                  ((TempDesc->Common.Type == ACPI_TYPE_STRING) ||
 855                   (TempDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE)))
 856             {
 857                 Operand[0] = TempDesc;
 858                 AcpiUtAddReference (TempDesc);
 859             }
 860             else
 861             {
 862                 Status = AE_AML_OPERAND_TYPE;
 863                 goto Cleanup;
 864             }
 865         }
 866         else
 867         {
 868             switch ((Operand[0])->Common.Type)
 869             {
 870             case ACPI_TYPE_LOCAL_REFERENCE:
 871                 /*
 872                  * This is a DerefOf (LocalX | ArgX)
 873                  *
 874                  * Must resolve/dereference the local/arg reference first
 875                  */
 876                 switch (Operand[0]->Reference.Class)
 877                 {
 878                 case ACPI_REFCLASS_LOCAL:
 879                 case ACPI_REFCLASS_ARG:
 880
 881                     /* Set Operand[0] to the value of the local/arg */
 882
 883                     Status = AcpiDsMethodDataGetValue (
 884                         Operand[0]->Reference.Class,
 885                         Operand[0]->Reference.Value,
 886                         WalkState, &TempDesc);
 887                     if (ACPI_FAILURE (Status))
 888                     {
 889                         goto Cleanup;
 890                     }
 891
 892                     /*
 893                      * Delete our reference to the input object and
 894                      * point to the object just retrieved
 895                      */
 896                     AcpiUtRemoveReference (Operand[0]);
 897                     Operand[0] = TempDesc;
 898                     break;
 899
 900                 case ACPI_REFCLASS_REFOF:
 901
 902                     /* Get the object to which the reference refers */
 903
 904                     TempDesc = Operand[0]->Reference.Object;
 905                     AcpiUtRemoveReference (Operand[0]);
 906                     Operand[0] = TempDesc;
 907                     break;
 908
 909                 default:
 910
 911                     /* Must be an Index op - handled below */
 912                     break;
 913                 }
 914                 break;
 915
 916             case ACPI_TYPE_STRING:
 917
 918                 break;
 919
 920             default:
 921
 922                 Status = AE_AML_OPERAND_TYPE;
 923                 goto Cleanup;
 924             }
 925         }
 926
 927         if (ACPI_GET_DESCRIPTOR_TYPE (Operand[0]) != ACPI_DESC_TYPE_NAMED)
 928         {
 929             if ((Operand[0])->Common.Type == ACPI_TYPE_STRING)
 930             {
 931                 /*
 932                  * This is a DerefOf (String). The string is a reference
 933                  * to a named ACPI object.
 934                  *
 935                  * 1) Find the owning Node
 936                  * 2) Dereference the node to an actual object. Could be a
 937                  *    Field, so we need to resolve the node to a value.
 938                  */
 939                 Status = AcpiNsGetNode (WalkState->ScopeInfo->Scope.Node,
 940                     Operand[0]->String.Pointer,
 941                     ACPI_NS_SEARCH_PARENT,
 942                     ACPI_CAST_INDIRECT_PTR (
 943                         ACPI_NAMESPACE_NODE, &ReturnDesc));
 944                 if (ACPI_FAILURE (Status))
 945                 {
 946                     goto Cleanup;
 947                 }
 948
 949                 Status = AcpiExResolveNodeToValue (
 950                     ACPI_CAST_INDIRECT_PTR (
 951                         ACPI_NAMESPACE_NODE, &ReturnDesc),
 952                     WalkState);
 953                 goto Cleanup;
 954             }
 955         }
 956
 957         /* Operand[0] may have changed from the code above */
 958
 959         if (ACPI_GET_DESCRIPTOR_TYPE (Operand[0]) == ACPI_DESC_TYPE_NAMED)
 960         {
 961             /*
 962              * This is a DerefOf (ObjectReference)
 963              * Get the actual object from the Node (This is the dereference).
 964              * This case may only happen when a LocalX or ArgX is
 965              * dereferenced above.
 966              */
 967             ReturnDesc = AcpiNsGetAttachedObject (
 968                 (ACPI_NAMESPACE_NODE *) Operand[0]);
 969             AcpiUtAddReference (ReturnDesc);
 970         }
 971         else
 972         {
 973             /*
 974              * This must be a reference object produced by either the
 975              * Index() or RefOf() operator
 976              */
 977             switch (Operand[0]->Reference.Class)
 978             {
 979             case ACPI_REFCLASS_INDEX:
 980                 /*
 981                  * The target type for the Index operator must be
 982                  * either a Buffer or a Package
 983                  */
 984                 switch (Operand[0]->Reference.TargetType)
 985                 {
 986                 case ACPI_TYPE_BUFFER_FIELD:
 987
 988                     TempDesc = Operand[0]->Reference.Object;
 989
 990                     /*
 991                      * Create a new object that contains one element of the
 992                      * buffer -- the element pointed to by the index.
 993                      *
 994                      * NOTE: index into a buffer is NOT a pointer to a
 995                      * sub-buffer of the main buffer, it is only a pointer to a
 996                      * single element (byte) of the buffer!
 997                      *
 998                      * Since we are returning the value of the buffer at the
 999                      * indexed location, we don't need to add an additional
1000                      * reference to the buffer itself.
1001                      */
1002                     ReturnDesc = AcpiUtCreateIntegerObject ((UINT64)
1003                         TempDesc->Buffer.Pointer[Operand[0]->Reference.Value]);
1004                     if (!ReturnDesc)
1005                     {
1006                         Status = AE_NO_MEMORY;
1007                         goto Cleanup;
1008                     }
1009                     break;
1010
1011                 case ACPI_TYPE_PACKAGE:
1012                     /*
1013                      * Return the referenced element of the package. We must
1014                      * add another reference to the referenced object, however.
1015                      */
1016                     ReturnDesc = *(Operand[0]->Reference.Where);
1017                     if (!ReturnDesc)
1018                     {
1019                         /*
1020                          * Element is NULL, do not allow the dereference.
1021                          * This provides compatibility with other ACPI
1022                          * implementations.
1023                          */
1024                         return_ACPI_STATUS (AE_AML_UNINITIALIZED_ELEMENT);
1025                     }
1026
1027                     AcpiUtAddReference (ReturnDesc);
1028                     break;
1029
1030                 default:
1031
1032                     ACPI_ERROR ((AE_INFO,
1033                         "Unknown Index TargetType 0x%X in reference object %p",
1034                         Operand[0]->Reference.TargetType, Operand[0]));
1035
1036                     Status = AE_AML_OPERAND_TYPE;
1037                     goto Cleanup;
1038                 }
1039                 break;
1040
1041             case ACPI_REFCLASS_REFOF:
1042
1043                 ReturnDesc = Operand[0]->Reference.Object;
1044
1045                 if (ACPI_GET_DESCRIPTOR_TYPE (ReturnDesc) ==
1046                     ACPI_DESC_TYPE_NAMED)
1047                 {
1048                     ReturnDesc = AcpiNsGetAttachedObject (
1049                         (ACPI_NAMESPACE_NODE *) ReturnDesc);
1050                     if (!ReturnDesc)
1051                     {
1052                         break;
1053                     }
1054
1055                    /*
1056                     * June 2013:
1057                     * BufferFields/FieldUnits require additional resolution
1058                     */
1059                     switch (ReturnDesc->Common.Type)
1060                     {
1061                     case ACPI_TYPE_BUFFER_FIELD:
1062                     case ACPI_TYPE_LOCAL_REGION_FIELD:
1063                     case ACPI_TYPE_LOCAL_BANK_FIELD:
1064                     case ACPI_TYPE_LOCAL_INDEX_FIELD:
1065
1066                         Status = AcpiExReadDataFromField (
1067                             WalkState, ReturnDesc, &TempDesc);
1068                         if (ACPI_FAILURE (Status))
1069                         {
1070                             goto Cleanup;
1071                         }
1072
1073                         ReturnDesc = TempDesc;
1074                         break;
1075
1076                     default:
1077
1078                         /* Add another reference to the object */
1079
1080                         AcpiUtAddReference (ReturnDesc);
1081                         break;
1082                     }
1083                 }
1084                 break;
1085
1086             default:
1087
1088                 ACPI_ERROR ((AE_INFO,
1089                     "Unknown class in reference(%p) - 0x%2.2X",
1090                     Operand[0], Operand[0]->Reference.Class));
1091
1092                 Status = AE_TYPE;
1093                 goto Cleanup;
1094             }
1095         }
1096         break;
1097
1098     default:
1099
1100         ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
1101             WalkState->Opcode));
1102
1103         Status = AE_AML_BAD_OPCODE;
1104         goto Cleanup;
1105     }
1106
1107
1108 Cleanup:
1109
1110     /* Delete return object on error */
1111
1112     if (ACPI_FAILURE (Status))
1113     {
1114         AcpiUtRemoveReference (ReturnDesc);
1115     }
1116
1117     /* Save return object on success */
1118
1119     else
1120     {
1121         WalkState->ResultObj = ReturnDesc;
1122     }
1123
1124     return_ACPI_STATUS (Status);
1125 }