drivers/acpi/executer/exoparg1.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exoparg1 - AML execution - opcodes with 1 argument
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2006, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acparser.h>
  47 #include <acpi/acdispat.h>
  48 #include <acpi/acinterp.h>
  49 #include <acpi/amlcode.h>
  50 #include <acpi/acnamesp.h>
  51
  52 #define _COMPONENT          ACPI_EXECUTER
  53 ACPI_MODULE_NAME("exoparg1")
  54
  55 /*!
  56  * Naming convention for AML interpreter execution routines.
  57  *
  58  * The routines that begin execution of AML opcodes are named with a common
  59  * convention based upon the number of arguments, the number of target operands,
  60  * and whether or not a value is returned:
  61  *
  62  *      AcpiExOpcode_xA_yT_zR
  63  *
  64  * Where:
  65  *
  66  * xA - ARGUMENTS:    The number of arguments (input operands) that are
  67  *                    required for this opcode type (0 through 6 args).
  68  * yT - TARGETS:      The number of targets (output operands) that are required
  69  *                    for this opcode type (0, 1, or 2 targets).
  70  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
  71  *                    as the function return (0 or 1).
  72  *
  73  * The AcpiExOpcode* functions are called via the Dispatcher component with
  74  * fully resolved operands.
  75 !*/
  76 /*******************************************************************************
  77  *
  78  * FUNCTION:    acpi_ex_opcode_0A_0T_1R
  79  *
  80  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
  81  *
  82  * RETURN:      Status
  83  *
  84  * DESCRIPTION: Execute operator with no operands, one return value
  85  *
  86  ******************************************************************************/
  87 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
  88 {
  89         acpi_status status = AE_OK;
  90         union acpi_operand_object *return_desc = NULL;
  91
  92         ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
  93                                 acpi_ps_get_opcode_name(walk_state->opcode));
  94
  95         /* Examine the AML opcode */
  96
  97         switch (walk_state->opcode) {
  98         case AML_TIMER_OP:      /*  Timer () */
  99
 100                 /* Create a return object of type Integer */
 101
 102                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 103                 if (!return_desc) {
 104                         status = AE_NO_MEMORY;
 105                         goto cleanup;
 106                 }
 107 #if ACPI_MACHINE_WIDTH != 16
 108                 return_desc->integer.value = acpi_os_get_timer();
 109 #endif
 110                 break;
 111
 112         default:                /*  Unknown opcode  */
 113
 114                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 115                             walk_state->opcode));
 116                 status = AE_AML_BAD_OPCODE;
 117                 break;
 118         }
 119
 120       cleanup:
 121
 122         /* Delete return object on error */
 123
 124         if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
 125                 acpi_ut_remove_reference(return_desc);
 126         } else {
 127                 /* Save the return value */
 128
 129                 walk_state->result_obj = return_desc;
 130         }
 131
 132         return_ACPI_STATUS(status);
 133 }
 134
 135 /*******************************************************************************
 136  *
 137  * FUNCTION:    acpi_ex_opcode_1A_0T_0R
 138  *
 139  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 140  *
 141  * RETURN:      Status
 142  *
 143  * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
 144  *              object stack
 145  *
 146  ******************************************************************************/
 147
 148 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
 149 {
 150         union acpi_operand_object **operand = &walk_state->operands[0];
 151         acpi_status status = AE_OK;
 152
 153         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
 154                                 acpi_ps_get_opcode_name(walk_state->opcode));
 155
 156         /* Examine the AML opcode */
 157
 158         switch (walk_state->opcode) {
 159         case AML_RELEASE_OP:    /*  Release (mutex_object) */
 160
 161                 status = acpi_ex_release_mutex(operand[0], walk_state);
 162                 break;
 163
 164         case AML_RESET_OP:      /*  Reset (event_object) */
 165
 166                 status = acpi_ex_system_reset_event(operand[0]);
 167                 break;
 168
 169         case AML_SIGNAL_OP:     /*  Signal (event_object) */
 170
 171                 status = acpi_ex_system_signal_event(operand[0]);
 172                 break;
 173
 174         case AML_SLEEP_OP:      /*  Sleep (msec_time) */
 175
 176                 status = acpi_ex_system_do_suspend(operand[0]->integer.value);
 177                 break;
 178
 179         case AML_STALL_OP:      /*  Stall (usec_time) */
 180
 181                 status =
 182                     acpi_ex_system_do_stall((u32) operand[0]->integer.value);
 183                 break;
 184
 185         case AML_UNLOAD_OP:     /*  Unload (Handle) */
 186
 187                 status = acpi_ex_unload_table(operand[0]);
 188                 break;
 189
 190         default:                /*  Unknown opcode  */
 191
 192                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 193                             walk_state->opcode));
 194                 status = AE_AML_BAD_OPCODE;
 195                 break;
 196         }
 197
 198         return_ACPI_STATUS(status);
 199 }
 200
 201 /*******************************************************************************
 202  *
 203  * FUNCTION:    acpi_ex_opcode_1A_1T_0R
 204  *
 205  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 206  *
 207  * RETURN:      Status
 208  *
 209  * DESCRIPTION: Execute opcode with one argument, one target, and no
 210  *              return value.
 211  *
 212  ******************************************************************************/
 213
 214 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
 215 {
 216         acpi_status status = AE_OK;
 217         union acpi_operand_object **operand = &walk_state->operands[0];
 218
 219         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
 220                                 acpi_ps_get_opcode_name(walk_state->opcode));
 221
 222         /* Examine the AML opcode */
 223
 224         switch (walk_state->opcode) {
 225         case AML_LOAD_OP:
 226
 227                 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
 228                 break;
 229
 230         default:                /* Unknown opcode */
 231
 232                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 233                             walk_state->opcode));
 234                 status = AE_AML_BAD_OPCODE;
 235                 goto cleanup;
 236         }
 237
 238       cleanup:
 239
 240         return_ACPI_STATUS(status);
 241 }
 242
 243 /*******************************************************************************
 244  *
 245  * FUNCTION:    acpi_ex_opcode_1A_1T_1R
 246  *
 247  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 248  *
 249  * RETURN:      Status
 250  *
 251  * DESCRIPTION: Execute opcode with one argument, one target, and a
 252  *              return value.
 253  *
 254  ******************************************************************************/
 255
 256 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
 257 {
 258         acpi_status status = AE_OK;
 259         union acpi_operand_object **operand = &walk_state->operands[0];
 260         union acpi_operand_object *return_desc = NULL;
 261         union acpi_operand_object *return_desc2 = NULL;
 262         u32 temp32;
 263         u32 i;
 264         acpi_integer power_of_ten;
 265         acpi_integer digit;
 266
 267         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
 268                                 acpi_ps_get_opcode_name(walk_state->opcode));
 269
 270         /* Examine the AML opcode */
 271
 272         switch (walk_state->opcode) {
 273         case AML_BIT_NOT_OP:
 274         case AML_FIND_SET_LEFT_BIT_OP:
 275         case AML_FIND_SET_RIGHT_BIT_OP:
 276         case AML_FROM_BCD_OP:
 277         case AML_TO_BCD_OP:
 278         case AML_COND_REF_OF_OP:
 279
 280                 /* Create a return object of type Integer for these opcodes */
 281
 282                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 283                 if (!return_desc) {
 284                         status = AE_NO_MEMORY;
 285                         goto cleanup;
 286                 }
 287
 288                 switch (walk_state->opcode) {
 289                 case AML_BIT_NOT_OP:    /* Not (Operand, Result)  */
 290
 291                         return_desc->integer.value = ~operand[0]->integer.value;
 292                         break;
 293
 294                 case AML_FIND_SET_LEFT_BIT_OP:  /* find_set_left_bit (Operand, Result) */
 295
 296                         return_desc->integer.value = operand[0]->integer.value;
 297
 298                         /*
 299                          * Acpi specification describes Integer type as a little
 300                          * endian unsigned value, so this boundary condition is valid.
 301                          */
 302                         for (temp32 = 0; return_desc->integer.value &&
 303                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 304                                 return_desc->integer.value >>= 1;
 305                         }
 306
 307                         return_desc->integer.value = temp32;
 308                         break;
 309
 310                 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
 311
 312                         return_desc->integer.value = operand[0]->integer.value;
 313
 314                         /*
 315                          * The Acpi specification describes Integer type as a little
 316                          * endian unsigned value, so this boundary condition is valid.
 317                          */
 318                         for (temp32 = 0; return_desc->integer.value &&
 319                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 320                                 return_desc->integer.value <<= 1;
 321                         }
 322
 323                         /* Since the bit position is one-based, subtract from 33 (65) */
 324
 325                         return_desc->integer.value = temp32 == 0 ? 0 :
 326                             (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
 327                         break;
 328
 329                 case AML_FROM_BCD_OP:   /* from_bcd (BCDValue, Result) */
 330
 331                         /*
 332                          * The 64-bit ACPI integer can hold 16 4-bit BCD characters
 333                          * (if table is 32-bit, integer can hold 8 BCD characters)
 334                          * Convert each 4-bit BCD value
 335                          */
 336                         power_of_ten = 1;
 337                         return_desc->integer.value = 0;
 338                         digit = operand[0]->integer.value;
 339
 340                         /* Convert each BCD digit (each is one nybble wide) */
 341
 342                         for (i = 0;
 343                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
 344                              i++) {
 345
 346                                 /* Get the least significant 4-bit BCD digit */
 347
 348                                 temp32 = ((u32) digit) & 0xF;
 349
 350                                 /* Check the range of the digit */
 351
 352                                 if (temp32 > 9) {
 353                                         ACPI_ERROR((AE_INFO,
 354                                                     "BCD digit too large (not decimal): 0x%X",
 355                                                     temp32));
 356
 357                                         status = AE_AML_NUMERIC_OVERFLOW;
 358                                         goto cleanup;
 359                                 }
 360
 361                                 /* Sum the digit into the result with the current power of 10 */
 362
 363                                 return_desc->integer.value +=
 364                                     (((acpi_integer) temp32) * power_of_ten);
 365
 366                                 /* Shift to next BCD digit */
 367
 368                                 digit >>= 4;
 369
 370                                 /* Next power of 10 */
 371
 372                                 power_of_ten *= 10;
 373                         }
 374                         break;
 375
 376                 case AML_TO_BCD_OP:     /* to_bcd (Operand, Result) */
 377
 378                         return_desc->integer.value = 0;
 379                         digit = operand[0]->integer.value;
 380
 381                         /* Each BCD digit is one nybble wide */
 382
 383                         for (i = 0;
 384                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
 385                              i++) {
 386                                 (void)acpi_ut_short_divide(digit, 10, &digit,
 387                                                            &temp32);
 388
 389                                 /*
 390                                  * Insert the BCD digit that resides in the
 391                                  * remainder from above
 392                                  */
 393                                 return_desc->integer.value |=
 394                                     (((acpi_integer) temp32) << ACPI_MUL_4(i));
 395                         }
 396
 397                         /* Overflow if there is any data left in Digit */
 398
 399                         if (digit > 0) {
 400                                 ACPI_ERROR((AE_INFO,
 401                                             "Integer too large to convert to BCD: %8.8X%8.8X",
 402                                             ACPI_FORMAT_UINT64(operand[0]->
 403                                                                integer.value)));
 404                                 status = AE_AML_NUMERIC_OVERFLOW;
 405                                 goto cleanup;
 406                         }
 407                         break;
 408
 409                 case AML_COND_REF_OF_OP:        /* cond_ref_of (source_object, Result) */
 410
 411                         /*
 412                          * This op is a little strange because the internal return value is
 413                          * different than the return value stored in the result descriptor
 414                          * (There are really two return values)
 415                          */
 416                         if ((struct acpi_namespace_node *)operand[0] ==
 417                             acpi_gbl_root_node) {
 418                                 /*
 419                                  * This means that the object does not exist in the namespace,
 420                                  * return FALSE
 421                                  */
 422                                 return_desc->integer.value = 0;
 423                                 goto cleanup;
 424                         }
 425
 426                         /* Get the object reference, store it, and remove our reference */
 427
 428                         status = acpi_ex_get_object_reference(operand[0],
 429                                                               &return_desc2,
 430                                                               walk_state);
 431                         if (ACPI_FAILURE(status)) {
 432                                 goto cleanup;
 433                         }
 434
 435                         status =
 436                             acpi_ex_store(return_desc2, operand[1], walk_state);
 437                         acpi_ut_remove_reference(return_desc2);
 438
 439                         /* The object exists in the namespace, return TRUE */
 440
 441                         return_desc->integer.value = ACPI_INTEGER_MAX;
 442                         goto cleanup;
 443
 444                 default:
 445                         /* No other opcodes get here */
 446                         break;
 447                 }
 448                 break;
 449
 450         case AML_STORE_OP:      /* Store (Source, Target) */
 451
 452                 /*
 453                  * A store operand is typically a number, string, buffer or lvalue
 454                  * Be careful about deleting the source object,
 455                  * since the object itself may have been stored.
 456                  */
 457                 status = acpi_ex_store(operand[0], operand[1], walk_state);
 458                 if (ACPI_FAILURE(status)) {
 459                         return_ACPI_STATUS(status);
 460                 }
 461
 462                 /* It is possible that the Store already produced a return object */
 463
 464                 if (!walk_state->result_obj) {
 465                         /*
 466                          * Normally, we would remove a reference on the Operand[0]
 467                          * parameter; But since it is being used as the internal return
 468                          * object (meaning we would normally increment it), the two
 469                          * cancel out, and we simply don't do anything.
 470                          */
 471                         walk_state->result_obj = operand[0];
 472                         walk_state->operands[0] = NULL; /* Prevent deletion */
 473                 }
 474                 return_ACPI_STATUS(status);
 475
 476                 /*
 477                  * ACPI 2.0 Opcodes
 478                  */
 479         case AML_COPY_OP:       /* Copy (Source, Target) */
 480
 481                 status =
 482                     acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
 483                                                     walk_state);
 484                 break;
 485
 486         case AML_TO_DECSTRING_OP:       /* to_decimal_string (Data, Result) */
 487
 488                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
 489                                                    ACPI_EXPLICIT_CONVERT_DECIMAL);
 490                 if (return_desc == operand[0]) {
 491
 492                         /* No conversion performed, add ref to handle return value */
 493                         acpi_ut_add_reference(return_desc);
 494                 }
 495                 break;
 496
 497         case AML_TO_HEXSTRING_OP:       /* to_hex_string (Data, Result) */
 498
 499                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
 500                                                    ACPI_EXPLICIT_CONVERT_HEX);
 501                 if (return_desc == operand[0]) {
 502
 503                         /* No conversion performed, add ref to handle return value */
 504                         acpi_ut_add_reference(return_desc);
 505                 }
 506                 break;
 507
 508         case AML_TO_BUFFER_OP:  /* to_buffer (Data, Result) */
 509
 510                 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
 511                 if (return_desc == operand[0]) {
 512
 513                         /* No conversion performed, add ref to handle return value */
 514                         acpi_ut_add_reference(return_desc);
 515                 }
 516                 break;
 517
 518         case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
 519
 520                 status = acpi_ex_convert_to_integer(operand[0], &return_desc,
 521                                                     ACPI_ANY_BASE);
 522                 if (return_desc == operand[0]) {
 523
 524                         /* No conversion performed, add ref to handle return value */
 525                         acpi_ut_add_reference(return_desc);
 526                 }
 527                 break;
 528
 529         case AML_SHIFT_LEFT_BIT_OP:     /* shift_left_bit (Source, bit_num) */
 530         case AML_SHIFT_RIGHT_BIT_OP:    /* shift_right_bit (Source, bit_num) */
 531
 532                 /* These are two obsolete opcodes */
 533
 534                 ACPI_ERROR((AE_INFO,
 535                             "%s is obsolete and not implemented",
 536                             acpi_ps_get_opcode_name(walk_state->opcode)));
 537                 status = AE_SUPPORT;
 538                 goto cleanup;
 539
 540         default:                /* Unknown opcode */
 541
 542                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 543                             walk_state->opcode));
 544                 status = AE_AML_BAD_OPCODE;
 545                 goto cleanup;
 546         }
 547
 548         if (ACPI_SUCCESS(status)) {
 549
 550                 /* Store the return value computed above into the target object */
 551
 552                 status = acpi_ex_store(return_desc, operand[1], walk_state);
 553         }
 554
 555       cleanup:
 556
 557         /* Delete return object on error */
 558
 559         if (ACPI_FAILURE(status)) {
 560                 acpi_ut_remove_reference(return_desc);
 561         }
 562
 563         /* Save return object on success */
 564
 565         else if (!walk_state->result_obj) {
 566                 walk_state->result_obj = return_desc;
 567         }
 568
 569         return_ACPI_STATUS(status);
 570 }
 571
 572 /*******************************************************************************
 573  *
 574  * FUNCTION:    acpi_ex_opcode_1A_0T_1R
 575  *
 576  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 577  *
 578  * RETURN:      Status
 579  *
 580  * DESCRIPTION: Execute opcode with one argument, no target, and a return value
 581  *
 582  ******************************************************************************/
 583
 584 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
 585 {
 586         union acpi_operand_object **operand = &walk_state->operands[0];
 587         union acpi_operand_object *temp_desc;
 588         union acpi_operand_object *return_desc = NULL;
 589         acpi_status status = AE_OK;
 590         u32 type;
 591         acpi_integer value;
 592
 593         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
 594                                 acpi_ps_get_opcode_name(walk_state->opcode));
 595
 596         /* Examine the AML opcode */
 597
 598         switch (walk_state->opcode) {
 599         case AML_LNOT_OP:       /* LNot (Operand) */
 600
 601                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 602                 if (!return_desc) {
 603                         status = AE_NO_MEMORY;
 604                         goto cleanup;
 605                 }
 606
 607                 /*
 608                  * Set result to ONES (TRUE) if Value == 0.  Note:
 609                  * return_desc->Integer.Value is initially == 0 (FALSE) from above.
 610                  */
 611                 if (!operand[0]->integer.value) {
 612                         return_desc->integer.value = ACPI_INTEGER_MAX;
 613                 }
 614                 break;
 615
 616         case AML_DECREMENT_OP:  /* Decrement (Operand)  */
 617         case AML_INCREMENT_OP:  /* Increment (Operand)  */
 618
 619                 /*
 620                  * Create a new integer.  Can't just get the base integer and
 621                  * increment it because it may be an Arg or Field.
 622                  */
 623                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 624                 if (!return_desc) {
 625                         status = AE_NO_MEMORY;
 626                         goto cleanup;
 627                 }
 628
 629                 /*
 630                  * Since we are expecting a Reference operand, it can be either a
 631                  * NS Node or an internal object.
 632                  */
 633                 temp_desc = operand[0];
 634                 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
 635                     ACPI_DESC_TYPE_OPERAND) {
 636
 637                         /* Internal reference object - prevent deletion */
 638
 639                         acpi_ut_add_reference(temp_desc);
 640                 }
 641
 642                 /*
 643                  * Convert the Reference operand to an Integer (This removes a
 644                  * reference on the Operand[0] object)
 645                  *
 646                  * NOTE:  We use LNOT_OP here in order to force resolution of the
 647                  * reference operand to an actual integer.
 648                  */
 649                 status =
 650                     acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
 651                                              walk_state);
 652                 if (ACPI_FAILURE(status)) {
 653                         ACPI_EXCEPTION((AE_INFO, status,
 654                                         "While resolving operands for [%s]",
 655                                         acpi_ps_get_opcode_name(walk_state->
 656                                                                 opcode)));
 657
 658                         goto cleanup;
 659                 }
 660
 661                 /*
 662                  * temp_desc is now guaranteed to be an Integer object --
 663                  * Perform the actual increment or decrement
 664                  */
 665                 if (walk_state->opcode == AML_INCREMENT_OP) {
 666                         return_desc->integer.value =
 667                             temp_desc->integer.value + 1;
 668                 } else {
 669                         return_desc->integer.value =
 670                             temp_desc->integer.value - 1;
 671                 }
 672
 673                 /* Finished with this Integer object */
 674
 675                 acpi_ut_remove_reference(temp_desc);
 676
 677                 /*
 678                  * Store the result back (indirectly) through the original
 679                  * Reference object
 680                  */
 681                 status = acpi_ex_store(return_desc, operand[0], walk_state);
 682                 break;
 683
 684         case AML_TYPE_OP:       /* object_type (source_object) */
 685
 686                 /*
 687                  * Note: The operand is not resolved at this point because we want to
 688                  * get the associated object, not its value.  For example, we don't
 689                  * want to resolve a field_unit to its value, we want the actual
 690                  * field_unit object.
 691                  */
 692
 693                 /* Get the type of the base object */
 694
 695                 status =
 696                     acpi_ex_resolve_multiple(walk_state, operand[0], &type,
 697                                              NULL);
 698                 if (ACPI_FAILURE(status)) {
 699                         goto cleanup;
 700                 }
 701                 /* Allocate a descriptor to hold the type. */
 702
 703                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 704                 if (!return_desc) {
 705                         status = AE_NO_MEMORY;
 706                         goto cleanup;
 707                 }
 708
 709                 return_desc->integer.value = type;
 710                 break;
 711
 712         case AML_SIZE_OF_OP:    /* size_of (source_object) */
 713
 714                 /*
 715                  * Note: The operand is not resolved at this point because we want to
 716                  * get the associated object, not its value.
 717                  */
 718
 719                 /* Get the base object */
 720
 721                 status = acpi_ex_resolve_multiple(walk_state,
 722                                                   operand[0], &type,
 723                                                   &temp_desc);
 724                 if (ACPI_FAILURE(status)) {
 725                         goto cleanup;
 726                 }
 727
 728                 /*
 729                  * The type of the base object must be integer, buffer, string, or
 730                  * package.  All others are not supported.
 731                  *
 732                  * NOTE: Integer is not specifically supported by the ACPI spec,
 733                  * but is supported implicitly via implicit operand conversion.
 734                  * rather than bother with conversion, we just use the byte width
 735                  * global (4 or 8 bytes).
 736                  */
 737                 switch (type) {
 738                 case ACPI_TYPE_INTEGER:
 739                         value = acpi_gbl_integer_byte_width;
 740                         break;
 741
 742                 case ACPI_TYPE_BUFFER:
 743                         value = temp_desc->buffer.length;
 744                         break;
 745
 746                 case ACPI_TYPE_STRING:
 747                         value = temp_desc->string.length;
 748                         break;
 749
 750                 case ACPI_TYPE_PACKAGE:
 751                         value = temp_desc->package.count;
 752                         break;
 753
 754                 default:
 755                         ACPI_ERROR((AE_INFO,
 756                                     "Operand is not Buf/Int/Str/Pkg - found type %s",
 757                                     acpi_ut_get_type_name(type)));
 758                         status = AE_AML_OPERAND_TYPE;
 759                         goto cleanup;
 760                 }
 761
 762                 /*
 763                  * Now that we have the size of the object, create a result
 764                  * object to hold the value
 765                  */
 766                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 767                 if (!return_desc) {
 768                         status = AE_NO_MEMORY;
 769                         goto cleanup;
 770                 }
 771
 772                 return_desc->integer.value = value;
 773                 break;
 774
 775         case AML_REF_OF_OP:     /* ref_of (source_object) */
 776
 777                 status =
 778                     acpi_ex_get_object_reference(operand[0], &return_desc,
 779                                                  walk_state);
 780                 if (ACPI_FAILURE(status)) {
 781                         goto cleanup;
 782                 }
 783                 break;
 784
 785         case AML_DEREF_OF_OP:   /* deref_of (obj_reference | String) */
 786
 787                 /* Check for a method local or argument, or standalone String */
 788
 789                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
 790                     ACPI_DESC_TYPE_NAMED) {
 791                         temp_desc =
 792                             acpi_ns_get_attached_object((struct
 793                                                          acpi_namespace_node *)
 794                                                         operand[0]);
 795                         if (temp_desc
 796                             &&
 797                             ((ACPI_GET_OBJECT_TYPE(temp_desc) ==
 798                               ACPI_TYPE_STRING)
 799                              || (ACPI_GET_OBJECT_TYPE(temp_desc) ==
 800                                  ACPI_TYPE_LOCAL_REFERENCE))) {
 801                                 operand[0] = temp_desc;
 802                                 acpi_ut_add_reference(temp_desc);
 803                         } else {
 804                                 status = AE_AML_OPERAND_TYPE;
 805                                 goto cleanup;
 806                         }
 807                 } else {
 808                         switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
 809                         case ACPI_TYPE_LOCAL_REFERENCE:
 810                                 /*
 811                                  * This is a deref_of (local_x | arg_x)
 812                                  *
 813                                  * Must resolve/dereference the local/arg reference first
 814                                  */
 815                                 switch (operand[0]->reference.opcode) {
 816                                 case AML_LOCAL_OP:
 817                                 case AML_ARG_OP:
 818
 819                                         /* Set Operand[0] to the value of the local/arg */
 820
 821                                         status =
 822                                             acpi_ds_method_data_get_value
 823                                             (operand[0]->reference.opcode,
 824                                              operand[0]->reference.offset,
 825                                              walk_state, &temp_desc);
 826                                         if (ACPI_FAILURE(status)) {
 827                                                 goto cleanup;
 828                                         }
 829
 830                                         /*
 831                                          * Delete our reference to the input object and
 832                                          * point to the object just retrieved
 833                                          */
 834                                         acpi_ut_remove_reference(operand[0]);
 835                                         operand[0] = temp_desc;
 836                                         break;
 837
 838                                 case AML_REF_OF_OP:
 839
 840                                         /* Get the object to which the reference refers */
 841
 842                                         temp_desc =
 843                                             operand[0]->reference.object;
 844                                         acpi_ut_remove_reference(operand[0]);
 845                                         operand[0] = temp_desc;
 846                                         break;
 847
 848                                 default:
 849
 850                                         /* Must be an Index op - handled below */
 851                                         break;
 852                                 }
 853                                 break;
 854
 855                         case ACPI_TYPE_STRING:
 856                                 break;
 857
 858                         default:
 859                                 status = AE_AML_OPERAND_TYPE;
 860                                 goto cleanup;
 861                         }
 862                 }
 863
 864                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
 865                     ACPI_DESC_TYPE_NAMED) {
 866                         if (ACPI_GET_OBJECT_TYPE(operand[0]) ==
 867                             ACPI_TYPE_STRING) {
 868                                 /*
 869                                  * This is a deref_of (String). The string is a reference
 870                                  * to a named ACPI object.
 871                                  *
 872                                  * 1) Find the owning Node
 873                                  * 2) Dereference the node to an actual object. Could be a
 874                                  *    Field, so we need to resolve the node to a value.
 875                                  */
 876                                 status =
 877                                     acpi_ns_get_node(walk_state->scope_info->
 878                                                      scope.node,
 879                                                      operand[0]->string.pointer,
 880                                                      ACPI_NS_SEARCH_PARENT,
 881                                                      ACPI_CAST_INDIRECT_PTR
 882                                                      (struct
 883                                                       acpi_namespace_node,
 884                                                       &return_desc));
 885                                 if (ACPI_FAILURE(status)) {
 886                                         goto cleanup;
 887                                 }
 888
 889                                 status =
 890                                     acpi_ex_resolve_node_to_value
 891                                     (ACPI_CAST_INDIRECT_PTR
 892                                      (struct acpi_namespace_node, &return_desc),
 893                                      walk_state);
 894                                 goto cleanup;
 895                         }
 896                 }
 897
 898                 /* Operand[0] may have changed from the code above */
 899
 900                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
 901                     ACPI_DESC_TYPE_NAMED) {
 902                         /*
 903                          * This is a deref_of (object_reference)
 904                          * Get the actual object from the Node (This is the dereference).
 905                          * This case may only happen when a local_x or arg_x is
 906                          * dereferenced above.
 907                          */
 908                         return_desc = acpi_ns_get_attached_object((struct
 909                                                                    acpi_namespace_node
 910                                                                    *)
 911                                                                   operand[0]);
 912                         acpi_ut_add_reference(return_desc);
 913                 } else {
 914                         /*
 915                          * This must be a reference object produced by either the
 916                          * Index() or ref_of() operator
 917                          */
 918                         switch (operand[0]->reference.opcode) {
 919                         case AML_INDEX_OP:
 920
 921                                 /*
 922                                  * The target type for the Index operator must be
 923                                  * either a Buffer or a Package
 924                                  */
 925                                 switch (operand[0]->reference.target_type) {
 926                                 case ACPI_TYPE_BUFFER_FIELD:
 927
 928                                         temp_desc =
 929                                             operand[0]->reference.object;
 930
 931                                         /*
 932                                          * Create a new object that contains one element of the
 933                                          * buffer -- the element pointed to by the index.
 934                                          *
 935                                          * NOTE: index into a buffer is NOT a pointer to a
 936                                          * sub-buffer of the main buffer, it is only a pointer to a
 937                                          * single element (byte) of the buffer!
 938                                          */
 939                                         return_desc =
 940                                             acpi_ut_create_internal_object
 941                                             (ACPI_TYPE_INTEGER);
 942                                         if (!return_desc) {
 943                                                 status = AE_NO_MEMORY;
 944                                                 goto cleanup;
 945                                         }
 946
 947                                         /*
 948                                          * Since we are returning the value of the buffer at the
 949                                          * indexed location, we don't need to add an additional
 950                                          * reference to the buffer itself.
 951                                          */
 952                                         return_desc->integer.value =
 953                                             temp_desc->buffer.
 954                                             pointer[operand[0]->reference.
 955                                                     offset];
 956                                         break;
 957
 958                                 case ACPI_TYPE_PACKAGE:
 959
 960                                         /*
 961                                          * Return the referenced element of the package.  We must
 962                                          * add another reference to the referenced object, however.
 963                                          */
 964                                         return_desc =
 965                                             *(operand[0]->reference.where);
 966                                         if (return_desc) {
 967                                                 acpi_ut_add_reference
 968                                                     (return_desc);
 969                                         }
 970
 971                                         break;
 972
 973                                 default:
 974
 975                                         ACPI_ERROR((AE_INFO,
 976                                                     "Unknown Index TargetType %X in obj %p",
 977                                                     operand[0]->reference.
 978                                                     target_type, operand[0]));
 979                                         status = AE_AML_OPERAND_TYPE;
 980                                         goto cleanup;
 981                                 }
 982                                 break;
 983
 984                         case AML_REF_OF_OP:
 985
 986                                 return_desc = operand[0]->reference.object;
 987
 988                                 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
 989                                     ACPI_DESC_TYPE_NAMED) {
 990
 991                                         return_desc =
 992                                             acpi_ns_get_attached_object((struct
 993                                                                          acpi_namespace_node
 994                                                                          *)
 995                                                                         return_desc);
 996                                 }
 997
 998                                 /* Add another reference to the object! */
 999
1000                                 acpi_ut_add_reference(return_desc);
1001                                 break;
1002
1003                         default:
1004                                 ACPI_ERROR((AE_INFO,
1005                                             "Unknown opcode in ref(%p) - %X",
1006                                             operand[0],
1007                                             operand[0]->reference.opcode));
1008
1009                                 status = AE_TYPE;
1010                                 goto cleanup;
1011                         }
1012                 }
1013                 break;
1014
1015         default:
1016
1017                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
1018                             walk_state->opcode));
1019                 status = AE_AML_BAD_OPCODE;
1020                 goto cleanup;
1021         }
1022
1023       cleanup:
1024
1025         /* Delete return object on error */
1026
1027         if (ACPI_FAILURE(status)) {
1028                 acpi_ut_remove_reference(return_desc);
1029         }
1030
1031         /* Save return object on success */
1032
1033         else {
1034                 walk_state->result_obj = return_desc;
1035         }
1036
1037         return_ACPI_STATUS(status);
1038 }