drivers/acpi/acpica/exoparg1.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exoparg1 - AML execution - opcodes with 1 argument
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acparser.h"
  47 #include "acdispat.h"
  48 #include "acinterp.h"
  49 #include "amlcode.h"
  50 #include "acnamesp.h"
  51
  52 #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 =
 103                     acpi_ut_create_integer_object(acpi_os_get_timer());
 104                 if (!return_desc) {
 105                         status = AE_NO_MEMORY;
 106                         goto cleanup;
 107                 }
 108                 break;
 109
 110         default:                /*  Unknown opcode  */
 111
 112                 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
 113                             walk_state->opcode));
 114                 status = AE_AML_BAD_OPCODE;
 115                 break;
 116         }
 117
 118 cleanup:
 119
 120         /* Delete return object on error */
 121
 122         if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
 123                 acpi_ut_remove_reference(return_desc);
 124                 walk_state->result_obj = NULL;
 125         } else {
 126                 /* Save the return value */
 127
 128                 walk_state->result_obj = return_desc;
 129         }
 130
 131         return_ACPI_STATUS(status);
 132 }
 133
 134 /*******************************************************************************
 135  *
 136  * FUNCTION:    acpi_ex_opcode_1A_0T_0R
 137  *
 138  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 139  *
 140  * RETURN:      Status
 141  *
 142  * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
 143  *              object stack
 144  *
 145  ******************************************************************************/
 146
 147 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
 148 {
 149         union acpi_operand_object **operand = &walk_state->operands[0];
 150         acpi_status status = AE_OK;
 151
 152         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
 153                                 acpi_ps_get_opcode_name(walk_state->opcode));
 154
 155         /* Examine the AML opcode */
 156
 157         switch (walk_state->opcode) {
 158         case AML_RELEASE_OP:    /*  Release (mutex_object) */
 159
 160                 status = acpi_ex_release_mutex(operand[0], walk_state);
 161                 break;
 162
 163         case AML_RESET_OP:      /*  Reset (event_object) */
 164
 165                 status = acpi_ex_system_reset_event(operand[0]);
 166                 break;
 167
 168         case AML_SIGNAL_OP:     /*  Signal (event_object) */
 169
 170                 status = acpi_ex_system_signal_event(operand[0]);
 171                 break;
 172
 173         case AML_SLEEP_OP:      /*  Sleep (msec_time) */
 174
 175                 status = acpi_ex_system_do_sleep(operand[0]->integer.value);
 176                 break;
 177
 178         case AML_STALL_OP:      /*  Stall (usec_time) */
 179
 180                 status =
 181                     acpi_ex_system_do_stall((u32) operand[0]->integer.value);
 182                 break;
 183
 184         case AML_UNLOAD_OP:     /*  Unload (Handle) */
 185
 186                 status = acpi_ex_unload_table(operand[0]);
 187                 break;
 188
 189         default:                /*  Unknown opcode  */
 190
 191                 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
 192                             walk_state->opcode));
 193                 status = AE_AML_BAD_OPCODE;
 194                 break;
 195         }
 196
 197         return_ACPI_STATUS(status);
 198 }
 199
 200 /*******************************************************************************
 201  *
 202  * FUNCTION:    acpi_ex_opcode_1A_1T_0R
 203  *
 204  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 205  *
 206  * RETURN:      Status
 207  *
 208  * DESCRIPTION: Execute opcode with one argument, one target, and no
 209  *              return value.
 210  *
 211  ******************************************************************************/
 212
 213 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
 214 {
 215         acpi_status status = AE_OK;
 216         union acpi_operand_object **operand = &walk_state->operands[0];
 217
 218         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
 219                                 acpi_ps_get_opcode_name(walk_state->opcode));
 220
 221         /* Examine the AML opcode */
 222
 223         switch (walk_state->opcode) {
 224         case AML_LOAD_OP:
 225
 226                 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
 227                 break;
 228
 229         default:                /* Unknown opcode */
 230
 231                 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
 232                             walk_state->opcode));
 233                 status = AE_AML_BAD_OPCODE;
 234                 goto cleanup;
 235         }
 236
 237 cleanup:
 238
 239         return_ACPI_STATUS(status);
 240 }
 241
 242 /*******************************************************************************
 243  *
 244  * FUNCTION:    acpi_ex_opcode_1A_1T_1R
 245  *
 246  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 247  *
 248  * RETURN:      Status
 249  *
 250  * DESCRIPTION: Execute opcode with one argument, one target, and a
 251  *              return value.
 252  *
 253  ******************************************************************************/
 254
 255 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
 256 {
 257         acpi_status status = AE_OK;
 258         union acpi_operand_object **operand = &walk_state->operands[0];
 259         union acpi_operand_object *return_desc = NULL;
 260         union acpi_operand_object *return_desc2 = NULL;
 261         u32 temp32;
 262         u32 i;
 263         u64 power_of_ten;
 264         u64 digit;
 265
 266         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
 267                                 acpi_ps_get_opcode_name(walk_state->opcode));
 268
 269         /* Examine the AML opcode */
 270
 271         switch (walk_state->opcode) {
 272         case AML_BIT_NOT_OP:
 273         case AML_FIND_SET_LEFT_BIT_OP:
 274         case AML_FIND_SET_RIGHT_BIT_OP:
 275         case AML_FROM_BCD_OP:
 276         case AML_TO_BCD_OP:
 277         case AML_COND_REF_OF_OP:
 278
 279                 /* Create a return object of type Integer for these opcodes */
 280
 281                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 282                 if (!return_desc) {
 283                         status = AE_NO_MEMORY;
 284                         goto cleanup;
 285                 }
 286
 287                 switch (walk_state->opcode) {
 288                 case AML_BIT_NOT_OP:    /* Not (Operand, Result)  */
 289
 290                         return_desc->integer.value = ~operand[0]->integer.value;
 291                         break;
 292
 293                 case AML_FIND_SET_LEFT_BIT_OP:  /* find_set_left_bit (Operand, Result) */
 294
 295                         return_desc->integer.value = operand[0]->integer.value;
 296
 297                         /*
 298                          * Acpi specification describes Integer type as a little
 299                          * endian unsigned value, so this boundary condition is valid.
 300                          */
 301                         for (temp32 = 0; return_desc->integer.value &&
 302                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 303                                 return_desc->integer.value >>= 1;
 304                         }
 305
 306                         return_desc->integer.value = temp32;
 307                         break;
 308
 309                 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
 310
 311                         return_desc->integer.value = operand[0]->integer.value;
 312
 313                         /*
 314                          * The Acpi specification describes Integer type as a little
 315                          * endian unsigned value, so this boundary condition is valid.
 316                          */
 317                         for (temp32 = 0; return_desc->integer.value &&
 318                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 319                                 return_desc->integer.value <<= 1;
 320                         }
 321
 322                         /* Since the bit position is one-based, subtract from 33 (65) */
 323
 324                         return_desc->integer.value =
 325                             temp32 ==
 326                             0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
 327                         break;
 328
 329                 case AML_FROM_BCD_OP:   /* from_bcd (BCDValue, Result) */
 330                         /*
 331                          * The 64-bit ACPI integer can hold 16 4-bit BCD characters
 332                          * (if table is 32-bit, integer can hold 8 BCD characters)
 333                          * Convert each 4-bit BCD value
 334                          */
 335                         power_of_ten = 1;
 336                         return_desc->integer.value = 0;
 337                         digit = operand[0]->integer.value;
 338
 339                         /* Convert each BCD digit (each is one nybble wide) */
 340
 341                         for (i = 0;
 342                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
 343                              i++) {
 344
 345                                 /* Get the least significant 4-bit BCD digit */
 346
 347                                 temp32 = ((u32) digit) & 0xF;
 348
 349                                 /* Check the range of the digit */
 350
 351                                 if (temp32 > 9) {
 352                                         ACPI_ERROR((AE_INFO,
 353                                                     "BCD digit too large (not decimal): 0x%X",
 354                                                     temp32));
 355
 356                                         status = AE_AML_NUMERIC_OVERFLOW;
 357                                         goto cleanup;
 358                                 }
 359
 360                                 /* Sum the digit into the result with the current power of 10 */
 361
 362                                 return_desc->integer.value +=
 363                                     (((u64) temp32) * power_of_ten);
 364
 365                                 /* Shift to next BCD digit */
 366
 367                                 digit >>= 4;
 368
 369                                 /* Next power of 10 */
 370
 371                                 power_of_ten *= 10;
 372                         }
 373                         break;
 374
 375                 case AML_TO_BCD_OP:     /* to_bcd (Operand, Result) */
 376
 377                         return_desc->integer.value = 0;
 378                         digit = operand[0]->integer.value;
 379
 380                         /* Each BCD digit is one nybble wide */
 381
 382                         for (i = 0;
 383                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
 384                              i++) {
 385                                 (void)acpi_ut_short_divide(digit, 10, &digit,
 386                                                            &temp32);
 387
 388                                 /*
 389                                  * Insert the BCD digit that resides in the
 390                                  * remainder from above
 391                                  */
 392                                 return_desc->integer.value |=
 393                                     (((u64) temp32) << ACPI_MUL_4(i));
 394                         }
 395
 396                         /* Overflow if there is any data left in Digit */
 397
 398                         if (digit > 0) {
 399                                 ACPI_ERROR((AE_INFO,
 400                                             "Integer too large to convert to BCD: 0x%8.8X%8.8X",
 401                                             ACPI_FORMAT_UINT64(operand[0]->
 402                                                                integer.value)));
 403                                 status = AE_AML_NUMERIC_OVERFLOW;
 404                                 goto cleanup;
 405                         }
 406                         break;
 407
 408                 case AML_COND_REF_OF_OP:        /* cond_ref_of (source_object, Result) */
 409                         /*
 410                          * This op is a little strange because the internal return value is
 411                          * different than the return value stored in the result descriptor
 412                          * (There are really two return values)
 413                          */
 414                         if ((struct acpi_namespace_node *)operand[0] ==
 415                             acpi_gbl_root_node) {
 416                                 /*
 417                                  * This means that the object does not exist in the namespace,
 418                                  * return FALSE
 419                                  */
 420                                 return_desc->integer.value = 0;
 421                                 goto cleanup;
 422                         }
 423
 424                         /* Get the object reference, store it, and remove our reference */
 425
 426                         status = acpi_ex_get_object_reference(operand[0],
 427                                                               &return_desc2,
 428                                                               walk_state);
 429                         if (ACPI_FAILURE(status)) {
 430                                 goto cleanup;
 431                         }
 432
 433                         status =
 434                             acpi_ex_store(return_desc2, operand[1], walk_state);
 435                         acpi_ut_remove_reference(return_desc2);
 436
 437                         /* The object exists in the namespace, return TRUE */
 438
 439                         return_desc->integer.value = ACPI_UINT64_MAX;
 440                         goto cleanup;
 441
 442                 default:
 443
 444                         /* No other opcodes get here */
 445
 446                         break;
 447                 }
 448                 break;
 449
 450         case AML_STORE_OP:      /* Store (Source, Target) */
 451                 /*
 452                  * A store operand is typically a number, string, buffer or lvalue
 453                  * Be careful about deleting the source object,
 454                  * since the object itself may have been stored.
 455                  */
 456                 status = acpi_ex_store(operand[0], operand[1], walk_state);
 457                 if (ACPI_FAILURE(status)) {
 458                         return_ACPI_STATUS(status);
 459                 }
 460
 461                 /* It is possible that the Store already produced a return object */
 462
 463                 if (!walk_state->result_obj) {
 464                         /*
 465                          * Normally, we would remove a reference on the Operand[0]
 466                          * parameter; But since it is being used as the internal return
 467                          * object (meaning we would normally increment it), the two
 468                          * cancel out, and we simply don't do anything.
 469                          */
 470                         walk_state->result_obj = operand[0];
 471                         walk_state->operands[0] = NULL; /* Prevent deletion */
 472                 }
 473                 return_ACPI_STATUS(status);
 474
 475                 /*
 476                  * ACPI 2.0 Opcodes
 477                  */
 478         case AML_COPY_OP:       /* Copy (Source, Target) */
 479
 480                 status =
 481                     acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
 482                                                     walk_state);
 483                 break;
 484
 485         case AML_TO_DECSTRING_OP:       /* to_decimal_string (Data, Result) */
 486
 487                 status =
 488                     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
 494                         acpi_ut_add_reference(return_desc);
 495                 }
 496                 break;
 497
 498         case AML_TO_HEXSTRING_OP:       /* to_hex_string (Data, Result) */
 499
 500                 status =
 501                     acpi_ex_convert_to_string(operand[0], &return_desc,
 502                                               ACPI_EXPLICIT_CONVERT_HEX);
 503                 if (return_desc == operand[0]) {
 504
 505                         /* No conversion performed, add ref to handle return value */
 506
 507                         acpi_ut_add_reference(return_desc);
 508                 }
 509                 break;
 510
 511         case AML_TO_BUFFER_OP:  /* to_buffer (Data, Result) */
 512
 513                 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
 514                 if (return_desc == operand[0]) {
 515
 516                         /* No conversion performed, add ref to handle return value */
 517
 518                         acpi_ut_add_reference(return_desc);
 519                 }
 520                 break;
 521
 522         case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
 523
 524                 /* Perform "explicit" conversion */
 525
 526                 status =
 527                     acpi_ex_convert_to_integer(operand[0], &return_desc, 0);
 528                 if (return_desc == operand[0]) {
 529
 530                         /* No conversion performed, add ref to handle return value */
 531
 532                         acpi_ut_add_reference(return_desc);
 533                 }
 534                 break;
 535
 536         case AML_SHIFT_LEFT_BIT_OP:     /* shift_left_bit (Source, bit_num) */
 537         case AML_SHIFT_RIGHT_BIT_OP:    /* shift_right_bit (Source, bit_num) */
 538
 539                 /* These are two obsolete opcodes */
 540
 541                 ACPI_ERROR((AE_INFO,
 542                             "%s is obsolete and not implemented",
 543                             acpi_ps_get_opcode_name(walk_state->opcode)));
 544                 status = AE_SUPPORT;
 545                 goto cleanup;
 546
 547         default:                /* Unknown opcode */
 548
 549                 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
 550                             walk_state->opcode));
 551                 status = AE_AML_BAD_OPCODE;
 552                 goto cleanup;
 553         }
 554
 555         if (ACPI_SUCCESS(status)) {
 556
 557                 /* Store the return value computed above into the target object */
 558
 559                 status = acpi_ex_store(return_desc, operand[1], walk_state);
 560         }
 561
 562 cleanup:
 563
 564         /* Delete return object on error */
 565
 566         if (ACPI_FAILURE(status)) {
 567                 acpi_ut_remove_reference(return_desc);
 568         }
 569
 570         /* Save return object on success */
 571
 572         else if (!walk_state->result_obj) {
 573                 walk_state->result_obj = return_desc;
 574         }
 575
 576         return_ACPI_STATUS(status);
 577 }
 578
 579 /*******************************************************************************
 580  *
 581  * FUNCTION:    acpi_ex_opcode_1A_0T_1R
 582  *
 583  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 584  *
 585  * RETURN:      Status
 586  *
 587  * DESCRIPTION: Execute opcode with one argument, no target, and a return value
 588  *
 589  ******************************************************************************/
 590
 591 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
 592 {
 593         union acpi_operand_object **operand = &walk_state->operands[0];
 594         union acpi_operand_object *temp_desc;
 595         union acpi_operand_object *return_desc = NULL;
 596         acpi_status status = AE_OK;
 597         u32 type;
 598         u64 value;
 599
 600         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
 601                                 acpi_ps_get_opcode_name(walk_state->opcode));
 602
 603         /* Examine the AML opcode */
 604
 605         switch (walk_state->opcode) {
 606         case AML_LNOT_OP:       /* LNot (Operand) */
 607
 608                 return_desc = acpi_ut_create_integer_object((u64) 0);
 609                 if (!return_desc) {
 610                         status = AE_NO_MEMORY;
 611                         goto cleanup;
 612                 }
 613
 614                 /*
 615                  * Set result to ONES (TRUE) if Value == 0. Note:
 616                  * return_desc->Integer.Value is initially == 0 (FALSE) from above.
 617                  */
 618                 if (!operand[0]->integer.value) {
 619                         return_desc->integer.value = ACPI_UINT64_MAX;
 620                 }
 621                 break;
 622
 623         case AML_DECREMENT_OP:  /* Decrement (Operand)  */
 624         case AML_INCREMENT_OP:  /* Increment (Operand)  */
 625                 /*
 626                  * Create a new integer. Can't just get the base integer and
 627                  * increment it because it may be an Arg or Field.
 628                  */
 629                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 630                 if (!return_desc) {
 631                         status = AE_NO_MEMORY;
 632                         goto cleanup;
 633                 }
 634
 635                 /*
 636                  * Since we are expecting a Reference operand, it can be either a
 637                  * NS Node or an internal object.
 638                  */
 639                 temp_desc = operand[0];
 640                 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
 641                     ACPI_DESC_TYPE_OPERAND) {
 642
 643                         /* Internal reference object - prevent deletion */
 644
 645                         acpi_ut_add_reference(temp_desc);
 646                 }
 647
 648                 /*
 649                  * Convert the Reference operand to an Integer (This removes a
 650                  * reference on the Operand[0] object)
 651                  *
 652                  * NOTE:  We use LNOT_OP here in order to force resolution of the
 653                  * reference operand to an actual integer.
 654                  */
 655                 status =
 656                     acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
 657                                              walk_state);
 658                 if (ACPI_FAILURE(status)) {
 659                         ACPI_EXCEPTION((AE_INFO, status,
 660                                         "While resolving operands for [%s]",
 661                                         acpi_ps_get_opcode_name(walk_state->
 662                                                                 opcode)));
 663
 664                         goto cleanup;
 665                 }
 666
 667                 /*
 668                  * temp_desc is now guaranteed to be an Integer object --
 669                  * Perform the actual increment or decrement
 670                  */
 671                 if (walk_state->opcode == AML_INCREMENT_OP) {
 672                         return_desc->integer.value =
 673                             temp_desc->integer.value + 1;
 674                 } else {
 675                         return_desc->integer.value =
 676                             temp_desc->integer.value - 1;
 677                 }
 678
 679                 /* Finished with this Integer object */
 680
 681                 acpi_ut_remove_reference(temp_desc);
 682
 683                 /*
 684                  * Store the result back (indirectly) through the original
 685                  * Reference object
 686                  */
 687                 status = acpi_ex_store(return_desc, operand[0], walk_state);
 688                 break;
 689
 690         case AML_OBJECT_TYPE_OP:        /* object_type (source_object) */
 691                 /*
 692                  * Note: The operand is not resolved at this point because we want to
 693                  * get the associated object, not its value. For example, we don't
 694                  * want to resolve a field_unit to its value, we want the actual
 695                  * field_unit object.
 696                  */
 697
 698                 /* Get the type of the base object */
 699
 700                 status =
 701                     acpi_ex_resolve_multiple(walk_state, operand[0], &type,
 702                                              NULL);
 703                 if (ACPI_FAILURE(status)) {
 704                         goto cleanup;
 705                 }
 706
 707                 /* Allocate a descriptor to hold the type. */
 708
 709                 return_desc = acpi_ut_create_integer_object((u64) type);
 710                 if (!return_desc) {
 711                         status = AE_NO_MEMORY;
 712                         goto cleanup;
 713                 }
 714                 break;
 715
 716         case AML_SIZE_OF_OP:    /* size_of (source_object) */
 717                 /*
 718                  * Note: The operand is not resolved at this point because we want to
 719                  * get the associated object, not its value.
 720                  */
 721
 722                 /* Get the base object */
 723
 724                 status =
 725                     acpi_ex_resolve_multiple(walk_state, operand[0], &type,
 726                                              &temp_desc);
 727                 if (ACPI_FAILURE(status)) {
 728                         goto cleanup;
 729                 }
 730
 731                 /*
 732                  * The type of the base object must be integer, buffer, string, or
 733                  * package. All others are not supported.
 734                  *
 735                  * NOTE: Integer is not specifically supported by the ACPI spec,
 736                  * but is supported implicitly via implicit operand conversion.
 737                  * rather than bother with conversion, we just use the byte width
 738                  * global (4 or 8 bytes).
 739                  */
 740                 switch (type) {
 741                 case ACPI_TYPE_INTEGER:
 742
 743                         value = acpi_gbl_integer_byte_width;
 744                         break;
 745
 746                 case ACPI_TYPE_STRING:
 747
 748                         value = temp_desc->string.length;
 749                         break;
 750
 751                 case ACPI_TYPE_BUFFER:
 752
 753                         /* Buffer arguments may not be evaluated at this point */
 754
 755                         status = acpi_ds_get_buffer_arguments(temp_desc);
 756                         value = temp_desc->buffer.length;
 757                         break;
 758
 759                 case ACPI_TYPE_PACKAGE:
 760
 761                         /* Package arguments may not be evaluated at this point */
 762
 763                         status = acpi_ds_get_package_arguments(temp_desc);
 764                         value = temp_desc->package.count;
 765                         break;
 766
 767                 default:
 768
 769                         ACPI_ERROR((AE_INFO,
 770                                     "Operand must be Buffer/Integer/String/Package"
 771                                     " - found type %s",
 772                                     acpi_ut_get_type_name(type)));
 773
 774                         status = AE_AML_OPERAND_TYPE;
 775                         goto cleanup;
 776                 }
 777
 778                 if (ACPI_FAILURE(status)) {
 779                         goto cleanup;
 780                 }
 781
 782                 /*
 783                  * Now that we have the size of the object, create a result
 784                  * object to hold the value
 785                  */
 786                 return_desc = acpi_ut_create_integer_object(value);
 787                 if (!return_desc) {
 788                         status = AE_NO_MEMORY;
 789                         goto cleanup;
 790                 }
 791                 break;
 792
 793         case AML_REF_OF_OP:     /* ref_of (source_object) */
 794
 795                 status =
 796                     acpi_ex_get_object_reference(operand[0], &return_desc,
 797                                                  walk_state);
 798                 if (ACPI_FAILURE(status)) {
 799                         goto cleanup;
 800                 }
 801                 break;
 802
 803         case AML_DEREF_OF_OP:   /* deref_of (obj_reference | String) */
 804
 805                 /* Check for a method local or argument, or standalone String */
 806
 807                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
 808                     ACPI_DESC_TYPE_NAMED) {
 809                         temp_desc =
 810                             acpi_ns_get_attached_object((struct
 811                                                          acpi_namespace_node *)
 812                                                         operand[0]);
 813                         if (temp_desc
 814                             && ((temp_desc->common.type == ACPI_TYPE_STRING)
 815                                 || (temp_desc->common.type ==
 816                                     ACPI_TYPE_LOCAL_REFERENCE))) {
 817                                 operand[0] = temp_desc;
 818                                 acpi_ut_add_reference(temp_desc);
 819                         } else {
 820                                 status = AE_AML_OPERAND_TYPE;
 821                                 goto cleanup;
 822                         }
 823                 } else {
 824                         switch ((operand[0])->common.type) {
 825                         case ACPI_TYPE_LOCAL_REFERENCE:
 826                                 /*
 827                                  * This is a deref_of (local_x | arg_x)
 828                                  *
 829                                  * Must resolve/dereference the local/arg reference first
 830                                  */
 831                                 switch (operand[0]->reference.class) {
 832                                 case ACPI_REFCLASS_LOCAL:
 833                                 case ACPI_REFCLASS_ARG:
 834
 835                                         /* Set Operand[0] to the value of the local/arg */
 836
 837                                         status =
 838                                             acpi_ds_method_data_get_value
 839                                             (operand[0]->reference.class,
 840                                              operand[0]->reference.value,
 841                                              walk_state, &temp_desc);
 842                                         if (ACPI_FAILURE(status)) {
 843                                                 goto cleanup;
 844                                         }
 845
 846                                         /*
 847                                          * Delete our reference to the input object and
 848                                          * point to the object just retrieved
 849                                          */
 850                                         acpi_ut_remove_reference(operand[0]);
 851                                         operand[0] = temp_desc;
 852                                         break;
 853
 854                                 case ACPI_REFCLASS_REFOF:
 855
 856                                         /* Get the object to which the reference refers */
 857
 858                                         temp_desc =
 859                                             operand[0]->reference.object;
 860                                         acpi_ut_remove_reference(operand[0]);
 861                                         operand[0] = temp_desc;
 862                                         break;
 863
 864                                 default:
 865
 866                                         /* Must be an Index op - handled below */
 867                                         break;
 868                                 }
 869                                 break;
 870
 871                         case ACPI_TYPE_STRING:
 872
 873                                 break;
 874
 875                         default:
 876
 877                                 status = AE_AML_OPERAND_TYPE;
 878                                 goto cleanup;
 879                         }
 880                 }
 881
 882                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
 883                     ACPI_DESC_TYPE_NAMED) {
 884                         if ((operand[0])->common.type == ACPI_TYPE_STRING) {
 885                                 /*
 886                                  * This is a deref_of (String). The string is a reference
 887                                  * to a named ACPI object.
 888                                  *
 889                                  * 1) Find the owning Node
 890                                  * 2) Dereference the node to an actual object. Could be a
 891                                  *    Field, so we need to resolve the node to a value.
 892                                  */
 893                                 status =
 894                                     acpi_ns_get_node_unlocked(walk_state->
 895                                                               scope_info->scope.
 896                                                               node,
 897                                                               operand[0]->
 898                                                               string.pointer,
 899                                                               ACPI_NS_SEARCH_PARENT,
 900                                                               ACPI_CAST_INDIRECT_PTR
 901                                                               (struct
 902                                                                acpi_namespace_node,
 903                                                                &return_desc));
 904                                 if (ACPI_FAILURE(status)) {
 905                                         goto cleanup;
 906                                 }
 907
 908                                 status =
 909                                     acpi_ex_resolve_node_to_value
 910                                     (ACPI_CAST_INDIRECT_PTR
 911                                      (struct acpi_namespace_node, &return_desc),
 912                                      walk_state);
 913                                 goto cleanup;
 914                         }
 915                 }
 916
 917                 /* Operand[0] may have changed from the code above */
 918
 919                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
 920                     ACPI_DESC_TYPE_NAMED) {
 921                         /*
 922                          * This is a deref_of (object_reference)
 923                          * Get the actual object from the Node (This is the dereference).
 924                          * This case may only happen when a local_x or arg_x is
 925                          * dereferenced above.
 926                          */
 927                         return_desc = acpi_ns_get_attached_object((struct
 928                                                                    acpi_namespace_node
 929                                                                    *)
 930                                                                   operand[0]);
 931                         acpi_ut_add_reference(return_desc);
 932                 } else {
 933                         /*
 934                          * This must be a reference object produced by either the
 935                          * Index() or ref_of() operator
 936                          */
 937                         switch (operand[0]->reference.class) {
 938                         case ACPI_REFCLASS_INDEX:
 939                                 /*
 940                                  * The target type for the Index operator must be
 941                                  * either a Buffer or a Package
 942                                  */
 943                                 switch (operand[0]->reference.target_type) {
 944                                 case ACPI_TYPE_BUFFER_FIELD:
 945
 946                                         temp_desc =
 947                                             operand[0]->reference.object;
 948
 949                                         /*
 950                                          * Create a new object that contains one element of the
 951                                          * buffer -- the element pointed to by the index.
 952                                          *
 953                                          * NOTE: index into a buffer is NOT a pointer to a
 954                                          * sub-buffer of the main buffer, it is only a pointer to a
 955                                          * single element (byte) of the buffer!
 956                                          *
 957                                          * Since we are returning the value of the buffer at the
 958                                          * indexed location, we don't need to add an additional
 959                                          * reference to the buffer itself.
 960                                          */
 961                                         return_desc =
 962                                             acpi_ut_create_integer_object((u64)
 963                                                                           temp_desc->buffer.pointer[operand[0]->reference.value]);
 964                                         if (!return_desc) {
 965                                                 status = AE_NO_MEMORY;
 966                                                 goto cleanup;
 967                                         }
 968                                         break;
 969
 970                                 case ACPI_TYPE_PACKAGE:
 971                                         /*
 972                                          * Return the referenced element of the package. We must
 973                                          * add another reference to the referenced object, however.
 974                                          */
 975                                         return_desc =
 976                                             *(operand[0]->reference.where);
 977                                         if (!return_desc) {
 978                                                 /*
 979                                                  * Element is NULL, do not allow the dereference.
 980                                                  * This provides compatibility with other ACPI
 981                                                  * implementations.
 982                                                  */
 983                                                 return_ACPI_STATUS
 984                                                     (AE_AML_UNINITIALIZED_ELEMENT);
 985                                         }
 986
 987                                         acpi_ut_add_reference(return_desc);
 988                                         break;
 989
 990                                 default:
 991
 992                                         ACPI_ERROR((AE_INFO,
 993                                                     "Unknown Index TargetType 0x%X in reference object %p",
 994                                                     operand[0]->reference.
 995                                                     target_type, operand[0]));
 996
 997                                         status = AE_AML_OPERAND_TYPE;
 998                                         goto cleanup;
 999                                 }
1000                                 break;
1001
1002                         case ACPI_REFCLASS_REFOF:
1003
1004                                 return_desc = operand[0]->reference.object;
1005
1006                                 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
1007                                     ACPI_DESC_TYPE_NAMED) {
1008                                         return_desc =
1009                                             acpi_ns_get_attached_object((struct
1010                                                                          acpi_namespace_node
1011                                                                          *)
1012                                                                         return_desc);
1013                                         if (!return_desc) {
1014                                                 break;
1015                                         }
1016
1017                                         /*
1018                                          * June 2013:
1019                                          * buffer_fields/field_units require additional resolution
1020                                          */
1021                                         switch (return_desc->common.type) {
1022                                         case ACPI_TYPE_BUFFER_FIELD:
1023                                         case ACPI_TYPE_LOCAL_REGION_FIELD:
1024                                         case ACPI_TYPE_LOCAL_BANK_FIELD:
1025                                         case ACPI_TYPE_LOCAL_INDEX_FIELD:
1026
1027                                                 status =
1028                                                     acpi_ex_read_data_from_field
1029                                                     (walk_state, return_desc,
1030                                                      &temp_desc);
1031                                                 if (ACPI_FAILURE(status)) {
1032                                                         goto cleanup;
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 }