drivers/acpi/acpica/exoparg1.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: exoparg1 - AML execution - opcodes with 1 argument
   5  *
   6  * Copyright (C) 2000 - 2023, Intel Corp.
   7  *
   8  *****************************************************************************/
   9
  10 #include <acpi/acpi.h>
  11 #include "accommon.h"
  12 #include "acparser.h"
  13 #include "acdispat.h"
  14 #include "acinterp.h"
  15 #include "amlcode.h"
  16 #include "acnamesp.h"
  17
  18 #define _COMPONENT          ACPI_EXECUTER
  19 ACPI_MODULE_NAME("exoparg1")
  20
  21 /*!
  22  * Naming convention for AML interpreter execution routines.
  23  *
  24  * The routines that begin execution of AML opcodes are named with a common
  25  * convention based upon the number of arguments, the number of target operands,
  26  * and whether or not a value is returned:
  27  *
  28  *      AcpiExOpcode_xA_yT_zR
  29  *
  30  * Where:
  31  *
  32  * xA - ARGUMENTS:    The number of arguments (input operands) that are
  33  *                    required for this opcode type (0 through 6 args).
  34  * yT - TARGETS:      The number of targets (output operands) that are required
  35  *                    for this opcode type (0, 1, or 2 targets).
  36  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
  37  *                    as the function return (0 or 1).
  38  *
  39  * The AcpiExOpcode* functions are called via the Dispatcher component with
  40  * fully resolved operands.
  41 !*/
  42 /*******************************************************************************
  43  *
  44  * FUNCTION:    acpi_ex_opcode_0A_0T_1R
  45  *
  46  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
  47  *
  48  * RETURN:      Status
  49  *
  50  * DESCRIPTION: Execute operator with no operands, one return value
  51  *
  52  ******************************************************************************/
  53 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
  54 {
  55         acpi_status status = AE_OK;
  56         union acpi_operand_object *return_desc = NULL;
  57
  58         ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
  59                                 acpi_ps_get_opcode_name(walk_state->opcode));
  60
  61         /* Examine the AML opcode */
  62
  63         switch (walk_state->opcode) {
  64         case AML_TIMER_OP:      /*  Timer () */
  65
  66                 /* Create a return object of type Integer */
  67
  68                 return_desc =
  69                     acpi_ut_create_integer_object(acpi_os_get_timer());
  70                 if (!return_desc) {
  71                         status = AE_NO_MEMORY;
  72                         goto cleanup;
  73                 }
  74                 break;
  75
  76         default:                /*  Unknown opcode  */
  77
  78                 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
  79                             walk_state->opcode));
  80                 status = AE_AML_BAD_OPCODE;
  81                 break;
  82         }
  83
  84 cleanup:
  85
  86         /* Delete return object on error */
  87
  88         if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
  89                 acpi_ut_remove_reference(return_desc);
  90                 walk_state->result_obj = NULL;
  91         } else {
  92                 /* Save the return value */
  93
  94                 walk_state->result_obj = return_desc;
  95         }
  96
  97         return_ACPI_STATUS(status);
  98 }
  99
 100 /*******************************************************************************
 101  *
 102  * FUNCTION:    acpi_ex_opcode_1A_0T_0R
 103  *
 104  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 105  *
 106  * RETURN:      Status
 107  *
 108  * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
 109  *              object stack
 110  *
 111  ******************************************************************************/
 112
 113 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
 114 {
 115         union acpi_operand_object **operand = &walk_state->operands[0];
 116         acpi_status status = AE_OK;
 117
 118         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
 119                                 acpi_ps_get_opcode_name(walk_state->opcode));
 120
 121         /* Examine the AML opcode */
 122
 123         switch (walk_state->opcode) {
 124         case AML_RELEASE_OP:    /*  Release (mutex_object) */
 125
 126                 status = acpi_ex_release_mutex(operand[0], walk_state);
 127                 break;
 128
 129         case AML_RESET_OP:      /*  Reset (event_object) */
 130
 131                 status = acpi_ex_system_reset_event(operand[0]);
 132                 break;
 133
 134         case AML_SIGNAL_OP:     /*  Signal (event_object) */
 135
 136                 status = acpi_ex_system_signal_event(operand[0]);
 137                 break;
 138
 139         case AML_SLEEP_OP:      /*  Sleep (msec_time) */
 140
 141                 status = acpi_ex_system_do_sleep(operand[0]->integer.value);
 142                 break;
 143
 144         case AML_STALL_OP:      /*  Stall (usec_time) */
 145
 146                 status =
 147                     acpi_ex_system_do_stall((u32) operand[0]->integer.value);
 148                 break;
 149
 150         case AML_UNLOAD_OP:     /*  Unload (Handle) */
 151
 152                 status = acpi_ex_unload_table(operand[0]);
 153                 break;
 154
 155         default:                /*  Unknown opcode  */
 156
 157                 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
 158                             walk_state->opcode));
 159                 status = AE_AML_BAD_OPCODE;
 160                 break;
 161         }
 162
 163         return_ACPI_STATUS(status);
 164 }
 165
 166 #ifdef _OBSOLETE_CODE           /* Was originally used for Load() operator */
 167 /*******************************************************************************
 168  *
 169  * FUNCTION:    acpi_ex_opcode_1A_1T_0R
 170  *
 171  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 172  *
 173  * RETURN:      Status
 174  *
 175  * DESCRIPTION: Execute opcode with one argument, one target, and no
 176  *              return value.
 177  *
 178  ******************************************************************************/
 179
 180 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
 181 {
 182         acpi_status status = AE_OK;
 183         union acpi_operand_object **operand = &walk_state->operands[0];
 184
 185         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
 186                                 acpi_ps_get_opcode_name(walk_state->opcode));
 187
 188         /* Examine the AML opcode */
 189
 190         switch (walk_state->opcode) {
 191 #ifdef _OBSOLETE_CODE
 192         case AML_LOAD_OP:
 193
 194                 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
 195                 break;
 196 #endif
 197
 198         default:                /* Unknown opcode */
 199
 200                 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
 201                             walk_state->opcode));
 202                 status = AE_AML_BAD_OPCODE;
 203                 goto cleanup;
 204         }
 205
 206 cleanup:
 207
 208         return_ACPI_STATUS(status);
 209 }
 210 #endif
 211
 212 /*******************************************************************************
 213  *
 214  * FUNCTION:    acpi_ex_opcode_1A_1T_1R
 215  *
 216  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 217  *
 218  * RETURN:      Status
 219  *
 220  * DESCRIPTION: Execute opcode with one argument, one target, and a
 221  *              return value.
 222  *              January 2022: Added Load operator, with new ACPI 6.4
 223  *              semantics.
 224  *
 225  ******************************************************************************/
 226
 227 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
 228 {
 229         acpi_status status = AE_OK;
 230         union acpi_operand_object **operand = &walk_state->operands[0];
 231         union acpi_operand_object *return_desc = NULL;
 232         union acpi_operand_object *return_desc2 = NULL;
 233         u32 temp32;
 234         u32 i;
 235         u64 power_of_ten;
 236         u64 digit;
 237
 238         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
 239                                 acpi_ps_get_opcode_name(walk_state->opcode));
 240
 241         /* Examine the AML opcode */
 242
 243         switch (walk_state->opcode) {
 244         case AML_BIT_NOT_OP:
 245         case AML_FIND_SET_LEFT_BIT_OP:
 246         case AML_FIND_SET_RIGHT_BIT_OP:
 247         case AML_FROM_BCD_OP:
 248         case AML_LOAD_OP:
 249         case AML_TO_BCD_OP:
 250         case AML_CONDITIONAL_REF_OF_OP:
 251
 252                 /* Create a return object of type Integer for these opcodes */
 253
 254                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 255                 if (!return_desc) {
 256                         status = AE_NO_MEMORY;
 257                         goto cleanup;
 258                 }
 259
 260                 switch (walk_state->opcode) {
 261                 case AML_BIT_NOT_OP:    /* Not (Operand, Result)  */
 262
 263                         return_desc->integer.value = ~operand[0]->integer.value;
 264                         break;
 265
 266                 case AML_FIND_SET_LEFT_BIT_OP:  /* find_set_left_bit (Operand, Result) */
 267
 268                         return_desc->integer.value = operand[0]->integer.value;
 269
 270                         /*
 271                          * Acpi specification describes Integer type as a little
 272                          * endian unsigned value, so this boundary condition is valid.
 273                          */
 274                         for (temp32 = 0; return_desc->integer.value &&
 275                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 276                                 return_desc->integer.value >>= 1;
 277                         }
 278
 279                         return_desc->integer.value = temp32;
 280                         break;
 281
 282                 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
 283
 284                         return_desc->integer.value = operand[0]->integer.value;
 285
 286                         /*
 287                          * The Acpi specification describes Integer type as a little
 288                          * endian unsigned value, so this boundary condition is valid.
 289                          */
 290                         for (temp32 = 0; return_desc->integer.value &&
 291                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 292                                 return_desc->integer.value <<= 1;
 293                         }
 294
 295                         /* Since the bit position is one-based, subtract from 33 (65) */
 296
 297                         return_desc->integer.value =
 298                             temp32 ==
 299                             0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
 300                         break;
 301
 302                 case AML_FROM_BCD_OP:   /* from_bcd (BCDValue, Result) */
 303                         /*
 304                          * The 64-bit ACPI integer can hold 16 4-bit BCD characters
 305                          * (if table is 32-bit, integer can hold 8 BCD characters)
 306                          * Convert each 4-bit BCD value
 307                          */
 308                         power_of_ten = 1;
 309                         return_desc->integer.value = 0;
 310                         digit = operand[0]->integer.value;
 311
 312                         /* Convert each BCD digit (each is one nybble wide) */
 313
 314                         for (i = 0;
 315                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
 316                              i++) {
 317
 318                                 /* Get the least significant 4-bit BCD digit */
 319
 320                                 temp32 = ((u32) digit) & 0xF;
 321
 322                                 /* Check the range of the digit */
 323
 324                                 if (temp32 > 9) {
 325                                         ACPI_ERROR((AE_INFO,
 326                                                     "BCD digit too large (not decimal): 0x%X",
 327                                                     temp32));
 328
 329                                         status = AE_AML_NUMERIC_OVERFLOW;
 330                                         goto cleanup;
 331                                 }
 332
 333                                 /* Sum the digit into the result with the current power of 10 */
 334
 335                                 return_desc->integer.value +=
 336                                     (((u64) temp32) * power_of_ten);
 337
 338                                 /* Shift to next BCD digit */
 339
 340                                 digit >>= 4;
 341
 342                                 /* Next power of 10 */
 343
 344                                 power_of_ten *= 10;
 345                         }
 346                         break;
 347
 348                 case AML_LOAD_OP:       /* Result1 = Load (Operand[0], Result1) */
 349
 350                         return_desc->integer.value = 0;
 351                         status =
 352                             acpi_ex_load_op(operand[0], return_desc,
 353                                             walk_state);
 354                         if (ACPI_SUCCESS(status)) {
 355
 356                                 /* Return -1 (non-zero) indicates success */
 357
 358                                 return_desc->integer.value = 0xFFFFFFFFFFFFFFFF;
 359                         }
 360                         break;
 361
 362                 case AML_TO_BCD_OP:     /* to_bcd (Operand, Result) */
 363
 364                         return_desc->integer.value = 0;
 365                         digit = operand[0]->integer.value;
 366
 367                         /* Each BCD digit is one nybble wide */
 368
 369                         for (i = 0;
 370                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
 371                              i++) {
 372                                 (void)acpi_ut_short_divide(digit, 10, &digit,
 373                                                            &temp32);
 374
 375                                 /*
 376                                  * Insert the BCD digit that resides in the
 377                                  * remainder from above
 378                                  */
 379                                 return_desc->integer.value |=
 380                                     (((u64) temp32) << ACPI_MUL_4(i));
 381                         }
 382
 383                         /* Overflow if there is any data left in Digit */
 384
 385                         if (digit > 0) {
 386                                 ACPI_ERROR((AE_INFO,
 387                                             "Integer too large to convert to BCD: 0x%8.8X%8.8X",
 388                                             ACPI_FORMAT_UINT64(operand[0]->
 389                                                                integer.value)));
 390                                 status = AE_AML_NUMERIC_OVERFLOW;
 391                                 goto cleanup;
 392                         }
 393                         break;
 394
 395                 case AML_CONDITIONAL_REF_OF_OP: /* cond_ref_of (source_object, Result) */
 396                         /*
 397                          * This op is a little strange because the internal return value is
 398                          * different than the return value stored in the result descriptor
 399                          * (There are really two return values)
 400                          */
 401                         if ((struct acpi_namespace_node *)operand[0] ==
 402                             acpi_gbl_root_node) {
 403                                 /*
 404                                  * This means that the object does not exist in the namespace,
 405                                  * return FALSE
 406                                  */
 407                                 return_desc->integer.value = 0;
 408                                 goto cleanup;
 409                         }
 410
 411                         /* Get the object reference, store it, and remove our reference */
 412
 413                         status = acpi_ex_get_object_reference(operand[0],
 414                                                               &return_desc2,
 415                                                               walk_state);
 416                         if (ACPI_FAILURE(status)) {
 417                                 goto cleanup;
 418                         }
 419
 420                         status =
 421                             acpi_ex_store(return_desc2, operand[1], walk_state);
 422                         acpi_ut_remove_reference(return_desc2);
 423
 424                         /* The object exists in the namespace, return TRUE */
 425
 426                         return_desc->integer.value = ACPI_UINT64_MAX;
 427                         goto cleanup;
 428
 429                 default:
 430
 431                         /* No other opcodes get here */
 432
 433                         break;
 434                 }
 435                 break;
 436
 437         case AML_STORE_OP:      /* Store (Source, Target) */
 438                 /*
 439                  * A store operand is typically a number, string, buffer or lvalue
 440                  * Be careful about deleting the source object,
 441                  * since the object itself may have been stored.
 442                  */
 443                 status = acpi_ex_store(operand[0], operand[1], walk_state);
 444                 if (ACPI_FAILURE(status)) {
 445                         return_ACPI_STATUS(status);
 446                 }
 447
 448                 /* It is possible that the Store already produced a return object */
 449
 450                 if (!walk_state->result_obj) {
 451                         /*
 452                          * Normally, we would remove a reference on the Operand[0]
 453                          * parameter; But since it is being used as the internal return
 454                          * object (meaning we would normally increment it), the two
 455                          * cancel out, and we simply don't do anything.
 456                          */
 457                         walk_state->result_obj = operand[0];
 458                         walk_state->operands[0] = NULL; /* Prevent deletion */
 459                 }
 460                 return_ACPI_STATUS(status);
 461
 462                 /*
 463                  * ACPI 2.0 Opcodes
 464                  */
 465         case AML_COPY_OBJECT_OP:        /* copy_object (Source, Target) */
 466
 467                 status =
 468                     acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
 469                                                     walk_state);
 470                 break;
 471
 472         case AML_TO_DECIMAL_STRING_OP:  /* to_decimal_string (Data, Result) */
 473
 474                 status =
 475                     acpi_ex_convert_to_string(operand[0], &return_desc,
 476                                               ACPI_EXPLICIT_CONVERT_DECIMAL);
 477                 if (return_desc == operand[0]) {
 478
 479                         /* No conversion performed, add ref to handle return value */
 480
 481                         acpi_ut_add_reference(return_desc);
 482                 }
 483                 break;
 484
 485         case AML_TO_HEX_STRING_OP:      /* to_hex_string (Data, Result) */
 486
 487                 status =
 488                     acpi_ex_convert_to_string(operand[0], &return_desc,
 489                                               ACPI_EXPLICIT_CONVERT_HEX);
 490                 if (return_desc == operand[0]) {
 491
 492                         /* No conversion performed, add ref to handle return value */
 493
 494                         acpi_ut_add_reference(return_desc);
 495                 }
 496                 break;
 497
 498         case AML_TO_BUFFER_OP:  /* to_buffer (Data, Result) */
 499
 500                 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
 501                 if (return_desc == operand[0]) {
 502
 503                         /* No conversion performed, add ref to handle return value */
 504
 505                         acpi_ut_add_reference(return_desc);
 506                 }
 507                 break;
 508
 509         case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
 510
 511                 /* Perform "explicit" conversion */
 512
 513                 status =
 514                     acpi_ex_convert_to_integer(operand[0], &return_desc, 0);
 515                 if (return_desc == operand[0]) {
 516
 517                         /* No conversion performed, add ref to handle return value */
 518
 519                         acpi_ut_add_reference(return_desc);
 520                 }
 521                 break;
 522
 523         case AML_SHIFT_LEFT_BIT_OP:     /* shift_left_bit (Source, bit_num) */
 524         case AML_SHIFT_RIGHT_BIT_OP:    /* shift_right_bit (Source, bit_num) */
 525
 526                 /* These are two obsolete opcodes */
 527
 528                 ACPI_ERROR((AE_INFO,
 529                             "%s is obsolete and not implemented",
 530                             acpi_ps_get_opcode_name(walk_state->opcode)));
 531                 status = AE_SUPPORT;
 532                 goto cleanup;
 533
 534         default:                /* Unknown opcode */
 535
 536                 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
 537                             walk_state->opcode));
 538                 status = AE_AML_BAD_OPCODE;
 539                 goto cleanup;
 540         }
 541
 542         if (ACPI_SUCCESS(status)) {
 543
 544                 /* Store the return value computed above into the target object */
 545
 546                 status = acpi_ex_store(return_desc, operand[1], walk_state);
 547         }
 548
 549 cleanup:
 550
 551         /* Delete return object on error */
 552
 553         if (ACPI_FAILURE(status)) {
 554                 acpi_ut_remove_reference(return_desc);
 555         }
 556
 557         /* Save return object on success */
 558
 559         else if (!walk_state->result_obj) {
 560                 walk_state->result_obj = return_desc;
 561         }
 562
 563         return_ACPI_STATUS(status);
 564 }
 565
 566 /*******************************************************************************
 567  *
 568  * FUNCTION:    acpi_ex_opcode_1A_0T_1R
 569  *
 570  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 571  *
 572  * RETURN:      Status
 573  *
 574  * DESCRIPTION: Execute opcode with one argument, no target, and a return value
 575  *
 576  ******************************************************************************/
 577
 578 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
 579 {
 580         union acpi_operand_object **operand = &walk_state->operands[0];
 581         union acpi_operand_object *temp_desc;
 582         union acpi_operand_object *return_desc = NULL;
 583         acpi_status status = AE_OK;
 584         u32 type;
 585         u64 value;
 586
 587         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
 588                                 acpi_ps_get_opcode_name(walk_state->opcode));
 589
 590         /* Examine the AML opcode */
 591
 592         switch (walk_state->opcode) {
 593         case AML_LOGICAL_NOT_OP:        /* LNot (Operand) */
 594
 595                 return_desc = acpi_ut_create_integer_object((u64) 0);
 596                 if (!return_desc) {
 597                         status = AE_NO_MEMORY;
 598                         goto cleanup;
 599                 }
 600
 601                 /*
 602                  * Set result to ONES (TRUE) if Value == 0. Note:
 603                  * return_desc->Integer.Value is initially == 0 (FALSE) from above.
 604                  */
 605                 if (!operand[0]->integer.value) {
 606                         return_desc->integer.value = ACPI_UINT64_MAX;
 607                 }
 608                 break;
 609
 610         case AML_DECREMENT_OP:  /* Decrement (Operand)  */
 611         case AML_INCREMENT_OP:  /* Increment (Operand)  */
 612                 /*
 613                  * Create a new integer. Can't just get the base integer and
 614                  * increment it because it may be an Arg or Field.
 615                  */
 616                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 617                 if (!return_desc) {
 618                         status = AE_NO_MEMORY;
 619                         goto cleanup;
 620                 }
 621
 622                 /*
 623                  * Since we are expecting a Reference operand, it can be either a
 624                  * NS Node or an internal object.
 625                  */
 626                 temp_desc = operand[0];
 627                 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
 628                     ACPI_DESC_TYPE_OPERAND) {
 629
 630                         /* Internal reference object - prevent deletion */
 631
 632                         acpi_ut_add_reference(temp_desc);
 633                 }
 634
 635                 /*
 636                  * Convert the Reference operand to an Integer (This removes a
 637                  * reference on the Operand[0] object)
 638                  *
 639                  * NOTE:  We use LNOT_OP here in order to force resolution of the
 640                  * reference operand to an actual integer.
 641                  */
 642                 status = acpi_ex_resolve_operands(AML_LOGICAL_NOT_OP,
 643                                                   &temp_desc, walk_state);
 644                 if (ACPI_FAILURE(status)) {
 645                         ACPI_EXCEPTION((AE_INFO, status,
 646                                         "While resolving operands for [%s]",
 647                                         acpi_ps_get_opcode_name(walk_state->
 648                                                                 opcode)));
 649
 650                         goto cleanup;
 651                 }
 652
 653                 /*
 654                  * temp_desc is now guaranteed to be an Integer object --
 655                  * Perform the actual increment or decrement
 656                  */
 657                 if (walk_state->opcode == AML_INCREMENT_OP) {
 658                         return_desc->integer.value =
 659                             temp_desc->integer.value + 1;
 660                 } else {
 661                         return_desc->integer.value =
 662                             temp_desc->integer.value - 1;
 663                 }
 664
 665                 /* Finished with this Integer object */
 666
 667                 acpi_ut_remove_reference(temp_desc);
 668
 669                 /*
 670                  * Store the result back (indirectly) through the original
 671                  * Reference object
 672                  */
 673                 status = acpi_ex_store(return_desc, operand[0], walk_state);
 674                 break;
 675
 676         case AML_OBJECT_TYPE_OP:        /* object_type (source_object) */
 677                 /*
 678                  * Note: The operand is not resolved at this point because we want to
 679                  * get the associated object, not its value. For example, we don't
 680                  * want to resolve a field_unit to its value, we want the actual
 681                  * field_unit object.
 682                  */
 683
 684                 /* Get the type of the base object */
 685
 686                 status =
 687                     acpi_ex_resolve_multiple(walk_state, operand[0], &type,
 688                                              NULL);
 689                 if (ACPI_FAILURE(status)) {
 690                         goto cleanup;
 691                 }
 692
 693                 /* Allocate a descriptor to hold the type. */
 694
 695                 return_desc = acpi_ut_create_integer_object((u64) type);
 696                 if (!return_desc) {
 697                         status = AE_NO_MEMORY;
 698                         goto cleanup;
 699                 }
 700                 break;
 701
 702         case AML_SIZE_OF_OP:    /* size_of (source_object) */
 703                 /*
 704                  * Note: The operand is not resolved at this point because we want to
 705                  * get the associated object, not its value.
 706                  */
 707
 708                 /* Get the base object */
 709
 710                 status =
 711                     acpi_ex_resolve_multiple(walk_state, operand[0], &type,
 712                                              &temp_desc);
 713                 if (ACPI_FAILURE(status)) {
 714                         goto cleanup;
 715                 }
 716
 717                 /*
 718                  * The type of the base object must be integer, buffer, string, or
 719                  * package. All others are not supported.
 720                  *
 721                  * NOTE: Integer is not specifically supported by the ACPI spec,
 722                  * but is supported implicitly via implicit operand conversion.
 723                  * rather than bother with conversion, we just use the byte width
 724                  * global (4 or 8 bytes).
 725                  */
 726                 switch (type) {
 727                 case ACPI_TYPE_INTEGER:
 728
 729                         value = acpi_gbl_integer_byte_width;
 730                         break;
 731
 732                 case ACPI_TYPE_STRING:
 733
 734                         value = temp_desc->string.length;
 735                         break;
 736
 737                 case ACPI_TYPE_BUFFER:
 738
 739                         /* Buffer arguments may not be evaluated at this point */
 740
 741                         status = acpi_ds_get_buffer_arguments(temp_desc);
 742                         value = temp_desc->buffer.length;
 743                         break;
 744
 745                 case ACPI_TYPE_PACKAGE:
 746
 747                         /* Package arguments may not be evaluated at this point */
 748
 749                         status = acpi_ds_get_package_arguments(temp_desc);
 750                         value = temp_desc->package.count;
 751                         break;
 752
 753                 default:
 754
 755                         ACPI_ERROR((AE_INFO,
 756                                     "Operand must be Buffer/Integer/String/Package"
 757                                     " - found type %s",
 758                                     acpi_ut_get_type_name(type)));
 759
 760                         status = AE_AML_OPERAND_TYPE;
 761                         goto cleanup;
 762                 }
 763
 764                 if (ACPI_FAILURE(status)) {
 765                         goto cleanup;
 766                 }
 767
 768                 /*
 769                  * Now that we have the size of the object, create a result
 770                  * object to hold the value
 771                  */
 772                 return_desc = acpi_ut_create_integer_object(value);
 773                 if (!return_desc) {
 774                         status = AE_NO_MEMORY;
 775                         goto cleanup;
 776                 }
 777                 break;
 778
 779         case AML_REF_OF_OP:     /* ref_of (source_object) */
 780
 781                 status =
 782                     acpi_ex_get_object_reference(operand[0], &return_desc,
 783                                                  walk_state);
 784                 if (ACPI_FAILURE(status)) {
 785                         goto cleanup;
 786                 }
 787                 break;
 788
 789         case AML_DEREF_OF_OP:   /* deref_of (obj_reference | String) */
 790
 791                 /* Check for a method local or argument, or standalone String */
 792
 793                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
 794                     ACPI_DESC_TYPE_NAMED) {
 795                         temp_desc =
 796                             acpi_ns_get_attached_object((struct
 797                                                          acpi_namespace_node *)
 798                                                         operand[0]);
 799                         if (temp_desc
 800                             && ((temp_desc->common.type == ACPI_TYPE_STRING)
 801                                 || (temp_desc->common.type ==
 802                                     ACPI_TYPE_LOCAL_REFERENCE))) {
 803                                 operand[0] = temp_desc;
 804                                 acpi_ut_add_reference(temp_desc);
 805                         } else {
 806                                 status = AE_AML_OPERAND_TYPE;
 807                                 goto cleanup;
 808                         }
 809                 } else {
 810                         switch ((operand[0])->common.type) {
 811                         case ACPI_TYPE_LOCAL_REFERENCE:
 812                                 /*
 813                                  * This is a deref_of (local_x | arg_x)
 814                                  *
 815                                  * Must resolve/dereference the local/arg reference first
 816                                  */
 817                                 switch (operand[0]->reference.class) {
 818                                 case ACPI_REFCLASS_LOCAL:
 819                                 case ACPI_REFCLASS_ARG:
 820
 821                                         /* Set Operand[0] to the value of the local/arg */
 822
 823                                         status =
 824                                             acpi_ds_method_data_get_value
 825                                             (operand[0]->reference.class,
 826                                              operand[0]->reference.value,
 827                                              walk_state, &temp_desc);
 828                                         if (ACPI_FAILURE(status)) {
 829                                                 goto cleanup;
 830                                         }
 831
 832                                         /*
 833                                          * Delete our reference to the input object and
 834                                          * point to the object just retrieved
 835                                          */
 836                                         acpi_ut_remove_reference(operand[0]);
 837                                         operand[0] = temp_desc;
 838                                         break;
 839
 840                                 case ACPI_REFCLASS_REFOF:
 841
 842                                         /* Get the object to which the reference refers */
 843
 844                                         temp_desc =
 845                                             operand[0]->reference.object;
 846                                         acpi_ut_remove_reference(operand[0]);
 847                                         operand[0] = temp_desc;
 848                                         break;
 849
 850                                 default:
 851
 852                                         /* Must be an Index op - handled below */
 853                                         break;
 854                                 }
 855                                 break;
 856
 857                         case ACPI_TYPE_STRING:
 858
 859                                 break;
 860
 861                         default:
 862
 863                                 status = AE_AML_OPERAND_TYPE;
 864                                 goto cleanup;
 865                         }
 866                 }
 867
 868                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
 869                     ACPI_DESC_TYPE_NAMED) {
 870                         if ((operand[0])->common.type == ACPI_TYPE_STRING) {
 871                                 /*
 872                                  * This is a deref_of (String). The string is a reference
 873                                  * to a named ACPI object.
 874                                  *
 875                                  * 1) Find the owning Node
 876                                  * 2) Dereference the node to an actual object. Could be a
 877                                  *    Field, so we need to resolve the node to a value.
 878                                  */
 879                                 status =
 880                                     acpi_ns_get_node_unlocked(walk_state->
 881                                                               scope_info->scope.
 882                                                               node,
 883                                                               operand[0]->
 884                                                               string.pointer,
 885                                                               ACPI_NS_SEARCH_PARENT,
 886                                                               ACPI_CAST_INDIRECT_PTR
 887                                                               (struct
 888                                                                acpi_namespace_node,
 889                                                                &return_desc));
 890                                 if (ACPI_FAILURE(status)) {
 891                                         goto cleanup;
 892                                 }
 893
 894                                 status =
 895                                     acpi_ex_resolve_node_to_value
 896                                     (ACPI_CAST_INDIRECT_PTR
 897                                      (struct acpi_namespace_node, &return_desc),
 898                                      walk_state);
 899                                 goto cleanup;
 900                         }
 901                 }
 902
 903                 /* Operand[0] may have changed from the code above */
 904
 905                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
 906                     ACPI_DESC_TYPE_NAMED) {
 907                         /*
 908                          * This is a deref_of (object_reference)
 909                          * Get the actual object from the Node (This is the dereference).
 910                          * This case may only happen when a local_x or arg_x is
 911                          * dereferenced above, or for references to device and
 912                          * thermal objects.
 913                          */
 914                         switch (((struct acpi_namespace_node *)operand[0])->
 915                                 type) {
 916                         case ACPI_TYPE_DEVICE:
 917                         case ACPI_TYPE_THERMAL:
 918
 919                                 /* These types have no node subobject, return the NS node */
 920
 921                                 return_desc = operand[0];
 922                                 break;
 923
 924                         default:
 925                                 /* For most types, get the object attached to the node */
 926
 927                                 return_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *)operand[0]);
 928                                 acpi_ut_add_reference(return_desc);
 929                                 break;
 930                         }
 931                 } else {
 932                         /*
 933                          * This must be a reference object produced by either the
 934                          * Index() or ref_of() operator
 935                          */
 936                         switch (operand[0]->reference.class) {
 937                         case ACPI_REFCLASS_INDEX:
 938                                 /*
 939                                  * The target type for the Index operator must be
 940                                  * either a Buffer or a Package
 941                                  */
 942                                 switch (operand[0]->reference.target_type) {
 943                                 case ACPI_TYPE_BUFFER_FIELD:
 944
 945                                         temp_desc =
 946                                             operand[0]->reference.object;
 947
 948                                         /*
 949                                          * Create a new object that contains one element of the
 950                                          * buffer -- the element pointed to by the index.
 951                                          *
 952                                          * NOTE: index into a buffer is NOT a pointer to a
 953                                          * sub-buffer of the main buffer, it is only a pointer to a
 954                                          * single element (byte) of the buffer!
 955                                          *
 956                                          * Since we are returning the value of the buffer at the
 957                                          * indexed location, we don't need to add an additional
 958                                          * reference to the buffer itself.
 959                                          */
 960                                         return_desc =
 961                                             acpi_ut_create_integer_object((u64)
 962                                                                           temp_desc->buffer.pointer[operand[0]->reference.value]);
 963                                         if (!return_desc) {
 964                                                 status = AE_NO_MEMORY;
 965                                                 goto cleanup;
 966                                         }
 967                                         break;
 968
 969                                 case ACPI_TYPE_PACKAGE:
 970                                         /*
 971                                          * Return the referenced element of the package. We must
 972                                          * add another reference to the referenced object, however.
 973                                          */
 974                                         return_desc =
 975                                             *(operand[0]->reference.where);
 976                                         if (!return_desc) {
 977                                                 /*
 978                                                  * Element is NULL, do not allow the dereference.
 979                                                  * This provides compatibility with other ACPI
 980                                                  * implementations.
 981                                                  */
 982                                                 return_ACPI_STATUS
 983                                                     (AE_AML_UNINITIALIZED_ELEMENT);
 984                                         }
 985
 986                                         acpi_ut_add_reference(return_desc);
 987                                         break;
 988
 989                                 default:
 990
 991                                         ACPI_ERROR((AE_INFO,
 992                                                     "Unknown Index TargetType 0x%X in reference object %p",
 993                                                     operand[0]->reference.
 994                                                     target_type, operand[0]));
 995
 996                                         status = AE_AML_OPERAND_TYPE;
 997                                         goto cleanup;
 998                                 }
 999                                 break;
1000
1001                         case ACPI_REFCLASS_REFOF:
1002
1003                                 return_desc = operand[0]->reference.object;
1004
1005                                 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
1006                                     ACPI_DESC_TYPE_NAMED) {
1007                                         return_desc =
1008                                             acpi_ns_get_attached_object((struct
1009                                                                          acpi_namespace_node
1010                                                                          *)
1011                                                                         return_desc);
1012                                         if (!return_desc) {
1013                                                 break;
1014                                         }
1015
1016                                         /*
1017                                          * June 2013:
1018                                          * buffer_fields/field_units require additional resolution
1019                                          */
1020                                         switch (return_desc->common.type) {
1021                                         case ACPI_TYPE_BUFFER_FIELD:
1022                                         case ACPI_TYPE_LOCAL_REGION_FIELD:
1023                                         case ACPI_TYPE_LOCAL_BANK_FIELD:
1024                                         case ACPI_TYPE_LOCAL_INDEX_FIELD:
1025
1026                                                 status =
1027                                                     acpi_ex_read_data_from_field
1028                                                     (walk_state, return_desc,
1029                                                      &temp_desc);
1030                                                 if (ACPI_FAILURE(status)) {
1031                                                         return_ACPI_STATUS
1032                                                             (status);
1033                                                 }
1034
1035                                                 return_desc = temp_desc;
1036                                                 break;
1037
1038                                         default:
1039
1040                                                 /* Add another reference to the object */
1041
1042                                                 acpi_ut_add_reference
1043                                                     (return_desc);
1044                                                 break;
1045                                         }
1046                                 }
1047                                 break;
1048
1049                         default:
1050
1051                                 ACPI_ERROR((AE_INFO,
1052                                             "Unknown class in reference(%p) - 0x%2.2X",
1053                                             operand[0],
1054                                             operand[0]->reference.class));
1055
1056                                 status = AE_TYPE;
1057                                 goto cleanup;
1058                         }
1059                 }
1060                 break;
1061
1062         default:
1063
1064                 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
1065                             walk_state->opcode));
1066
1067                 status = AE_AML_BAD_OPCODE;
1068                 goto cleanup;
1069         }
1070
1071 cleanup:
1072
1073         /* Delete return object on error */
1074
1075         if (ACPI_FAILURE(status)) {
1076                 acpi_ut_remove_reference(return_desc);
1077         }
1078
1079         /* Save return object on success */
1080
1081         else {
1082                 walk_state->result_obj = return_desc;
1083         }
1084
1085         return_ACPI_STATUS(status);
1086 }