drivers/acpi/acpica/exoparg1.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exoparg1 - AML execution - opcodes with 1 argument
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2008, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acparser.h"
  48 #include "acdispat.h"
  49 #include "acinterp.h"
  50 #include "amlcode.h"
  51 #include "acnamesp.h"
  52
  53 #define _COMPONENT          ACPI_EXECUTER
  54 ACPI_MODULE_NAME("exoparg1")
  55
  56 /*!
  57  * Naming convention for AML interpreter execution routines.
  58  *
  59  * The routines that begin execution of AML opcodes are named with a common
  60  * convention based upon the number of arguments, the number of target operands,
  61  * and whether or not a value is returned:
  62  *
  63  *      AcpiExOpcode_xA_yT_zR
  64  *
  65  * Where:
  66  *
  67  * xA - ARGUMENTS:    The number of arguments (input operands) that are
  68  *                    required for this opcode type (0 through 6 args).
  69  * yT - TARGETS:      The number of targets (output operands) that are required
  70  *                    for this opcode type (0, 1, or 2 targets).
  71  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
  72  *                    as the function return (0 or 1).
  73  *
  74  * The AcpiExOpcode* functions are called via the Dispatcher component with
  75  * fully resolved operands.
  76 !*/
  77 /*******************************************************************************
  78  *
  79  * FUNCTION:    acpi_ex_opcode_0A_0T_1R
  80  *
  81  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
  82  *
  83  * RETURN:      Status
  84  *
  85  * DESCRIPTION: Execute operator with no operands, one return value
  86  *
  87  ******************************************************************************/
  88 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
  89 {
  90         acpi_status status = AE_OK;
  91         union acpi_operand_object *return_desc = NULL;
  92
  93         ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
  94                                 acpi_ps_get_opcode_name(walk_state->opcode));
  95
  96         /* Examine the AML opcode */
  97
  98         switch (walk_state->opcode) {
  99         case AML_TIMER_OP:      /*  Timer () */
 100
 101                 /* Create a return object of type Integer */
 102
 103                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 104                 if (!return_desc) {
 105                         status = AE_NO_MEMORY;
 106                         goto cleanup;
 107                 }
 108                 return_desc->integer.value = acpi_os_get_timer();
 109                 break;
 110
 111         default:                /*  Unknown opcode  */
 112
 113                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 114                             walk_state->opcode));
 115                 status = AE_AML_BAD_OPCODE;
 116                 break;
 117         }
 118
 119       cleanup:
 120
 121         /* Delete return object on error */
 122
 123         if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
 124                 acpi_ut_remove_reference(return_desc);
 125                 walk_state->result_obj = NULL;
 126         } else {
 127                 /* Save the return value */
 128
 129                 walk_state->result_obj = return_desc;
 130         }
 131
 132         return_ACPI_STATUS(status);
 133 }
 134
 135 /*******************************************************************************
 136  *
 137  * FUNCTION:    acpi_ex_opcode_1A_0T_0R
 138  *
 139  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 140  *
 141  * RETURN:      Status
 142  *
 143  * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
 144  *              object stack
 145  *
 146  ******************************************************************************/
 147
 148 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
 149 {
 150         union acpi_operand_object **operand = &walk_state->operands[0];
 151         acpi_status status = AE_OK;
 152
 153         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
 154                                 acpi_ps_get_opcode_name(walk_state->opcode));
 155
 156         /* Examine the AML opcode */
 157
 158         switch (walk_state->opcode) {
 159         case AML_RELEASE_OP:    /*  Release (mutex_object) */
 160
 161                 status = acpi_ex_release_mutex(operand[0], walk_state);
 162                 break;
 163
 164         case AML_RESET_OP:      /*  Reset (event_object) */
 165
 166                 status = acpi_ex_system_reset_event(operand[0]);
 167                 break;
 168
 169         case AML_SIGNAL_OP:     /*  Signal (event_object) */
 170
 171                 status = acpi_ex_system_signal_event(operand[0]);
 172                 break;
 173
 174         case AML_SLEEP_OP:      /*  Sleep (msec_time) */
 175
 176                 status = acpi_ex_system_do_suspend(operand[0]->integer.value);
 177                 break;
 178
 179         case AML_STALL_OP:      /*  Stall (usec_time) */
 180
 181                 status =
 182                     acpi_ex_system_do_stall((u32) operand[0]->integer.value);
 183                 break;
 184
 185         case AML_UNLOAD_OP:     /*  Unload (Handle) */
 186
 187                 status = acpi_ex_unload_table(operand[0]);
 188                 break;
 189
 190         default:                /*  Unknown opcode  */
 191
 192                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 193                             walk_state->opcode));
 194                 status = AE_AML_BAD_OPCODE;
 195                 break;
 196         }
 197
 198         return_ACPI_STATUS(status);
 199 }
 200
 201 /*******************************************************************************
 202  *
 203  * FUNCTION:    acpi_ex_opcode_1A_1T_0R
 204  *
 205  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 206  *
 207  * RETURN:      Status
 208  *
 209  * DESCRIPTION: Execute opcode with one argument, one target, and no
 210  *              return value.
 211  *
 212  ******************************************************************************/
 213
 214 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
 215 {
 216         acpi_status status = AE_OK;
 217         union acpi_operand_object **operand = &walk_state->operands[0];
 218
 219         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
 220                                 acpi_ps_get_opcode_name(walk_state->opcode));
 221
 222         /* Examine the AML opcode */
 223
 224         switch (walk_state->opcode) {
 225         case AML_LOAD_OP:
 226
 227                 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
 228                 break;
 229
 230         default:                /* Unknown opcode */
 231
 232                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 233                             walk_state->opcode));
 234                 status = AE_AML_BAD_OPCODE;
 235                 goto cleanup;
 236         }
 237
 238       cleanup:
 239
 240         return_ACPI_STATUS(status);
 241 }
 242
 243 /*******************************************************************************
 244  *
 245  * FUNCTION:    acpi_ex_opcode_1A_1T_1R
 246  *
 247  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 248  *
 249  * RETURN:      Status
 250  *
 251  * DESCRIPTION: Execute opcode with one argument, one target, and a
 252  *              return value.
 253  *
 254  ******************************************************************************/
 255
 256 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
 257 {
 258         acpi_status status = AE_OK;
 259         union acpi_operand_object **operand = &walk_state->operands[0];
 260         union acpi_operand_object *return_desc = NULL;
 261         union acpi_operand_object *return_desc2 = NULL;
 262         u32 temp32;
 263         u32 i;
 264         acpi_integer power_of_ten;
 265         acpi_integer digit;
 266
 267         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
 268                                 acpi_ps_get_opcode_name(walk_state->opcode));
 269
 270         /* Examine the AML opcode */
 271
 272         switch (walk_state->opcode) {
 273         case AML_BIT_NOT_OP:
 274         case AML_FIND_SET_LEFT_BIT_OP:
 275         case AML_FIND_SET_RIGHT_BIT_OP:
 276         case AML_FROM_BCD_OP:
 277         case AML_TO_BCD_OP:
 278         case AML_COND_REF_OF_OP:
 279
 280                 /* Create a return object of type Integer for these opcodes */
 281
 282                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 283                 if (!return_desc) {
 284                         status = AE_NO_MEMORY;
 285                         goto cleanup;
 286                 }
 287
 288                 switch (walk_state->opcode) {
 289                 case AML_BIT_NOT_OP:    /* Not (Operand, Result)  */
 290
 291                         return_desc->integer.value = ~operand[0]->integer.value;
 292                         break;
 293
 294                 case AML_FIND_SET_LEFT_BIT_OP:  /* find_set_left_bit (Operand, Result) */
 295
 296                         return_desc->integer.value = operand[0]->integer.value;
 297
 298                         /*
 299                          * Acpi specification describes Integer type as a little
 300                          * endian unsigned value, so this boundary condition is valid.
 301                          */
 302                         for (temp32 = 0; return_desc->integer.value &&
 303                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 304                                 return_desc->integer.value >>= 1;
 305                         }
 306
 307                         return_desc->integer.value = temp32;
 308                         break;
 309
 310                 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
 311
 312                         return_desc->integer.value = operand[0]->integer.value;
 313
 314                         /*
 315                          * The Acpi specification describes Integer type as a little
 316                          * endian unsigned value, so this boundary condition is valid.
 317                          */
 318                         for (temp32 = 0; return_desc->integer.value &&
 319                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 320                                 return_desc->integer.value <<= 1;
 321                         }
 322
 323                         /* Since the bit position is one-based, subtract from 33 (65) */
 324
 325                         return_desc->integer.value =
 326                             temp32 ==
 327                             0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
 328                         break;
 329
 330                 case AML_FROM_BCD_OP:   /* from_bcd (BCDValue, Result) */
 331
 332                         /*
 333                          * The 64-bit ACPI integer can hold 16 4-bit BCD characters
 334                          * (if table is 32-bit, integer can hold 8 BCD characters)
 335                          * Convert each 4-bit BCD value
 336                          */
 337                         power_of_ten = 1;
 338                         return_desc->integer.value = 0;
 339                         digit = operand[0]->integer.value;
 340
 341                         /* Convert each BCD digit (each is one nybble wide) */
 342
 343                         for (i = 0;
 344                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
 345                              i++) {
 346
 347                                 /* Get the least significant 4-bit BCD digit */
 348
 349                                 temp32 = ((u32) digit) & 0xF;
 350
 351                                 /* Check the range of the digit */
 352
 353                                 if (temp32 > 9) {
 354                                         ACPI_ERROR((AE_INFO,
 355                                                     "BCD digit too large (not decimal): 0x%X",
 356                                                     temp32));
 357
 358                                         status = AE_AML_NUMERIC_OVERFLOW;
 359                                         goto cleanup;
 360                                 }
 361
 362                                 /* Sum the digit into the result with the current power of 10 */
 363
 364                                 return_desc->integer.value +=
 365                                     (((acpi_integer) temp32) * power_of_ten);
 366
 367                                 /* Shift to next BCD digit */
 368
 369                                 digit >>= 4;
 370
 371                                 /* Next power of 10 */
 372
 373                                 power_of_ten *= 10;
 374                         }
 375                         break;
 376
 377                 case AML_TO_BCD_OP:     /* to_bcd (Operand, Result) */
 378
 379                         return_desc->integer.value = 0;
 380                         digit = operand[0]->integer.value;
 381
 382                         /* Each BCD digit is one nybble wide */
 383
 384                         for (i = 0;
 385                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
 386                              i++) {
 387                                 (void)acpi_ut_short_divide(digit, 10, &digit,
 388                                                            &temp32);
 389
 390                                 /*
 391                                  * Insert the BCD digit that resides in the
 392                                  * remainder from above
 393                                  */
 394                                 return_desc->integer.value |=
 395                                     (((acpi_integer) temp32) << ACPI_MUL_4(i));
 396                         }
 397
 398                         /* Overflow if there is any data left in Digit */
 399
 400                         if (digit > 0) {
 401                                 ACPI_ERROR((AE_INFO,
 402                                             "Integer too large to convert to BCD: %8.8X%8.8X",
 403                                             ACPI_FORMAT_UINT64(operand[0]->
 404                                                                integer.value)));
 405                                 status = AE_AML_NUMERIC_OVERFLOW;
 406                                 goto cleanup;
 407                         }
 408                         break;
 409
 410                 case AML_COND_REF_OF_OP:        /* cond_ref_of (source_object, Result) */
 411
 412                         /*
 413                          * This op is a little strange because the internal return value is
 414                          * different than the return value stored in the result descriptor
 415                          * (There are really two return values)
 416                          */
 417                         if ((struct acpi_namespace_node *)operand[0] ==
 418                             acpi_gbl_root_node) {
 419                                 /*
 420                                  * This means that the object does not exist in the namespace,
 421                                  * return FALSE
 422                                  */
 423                                 return_desc->integer.value = 0;
 424                                 goto cleanup;
 425                         }
 426
 427                         /* Get the object reference, store it, and remove our reference */
 428
 429                         status = acpi_ex_get_object_reference(operand[0],
 430                                                               &return_desc2,
 431                                                               walk_state);
 432                         if (ACPI_FAILURE(status)) {
 433                                 goto cleanup;
 434                         }
 435
 436                         status =
 437                             acpi_ex_store(return_desc2, operand[1], walk_state);
 438                         acpi_ut_remove_reference(return_desc2);
 439
 440                         /* The object exists in the namespace, return TRUE */
 441
 442                         return_desc->integer.value = ACPI_INTEGER_MAX;
 443                         goto cleanup;
 444
 445                 default:
 446                         /* No other opcodes get here */
 447                         break;
 448                 }
 449                 break;
 450
 451         case AML_STORE_OP:      /* Store (Source, Target) */
 452
 453                 /*
 454                  * A store operand is typically a number, string, buffer or lvalue
 455                  * Be careful about deleting the source object,
 456                  * since the object itself may have been stored.
 457                  */
 458                 status = acpi_ex_store(operand[0], operand[1], walk_state);
 459                 if (ACPI_FAILURE(status)) {
 460                         return_ACPI_STATUS(status);
 461                 }
 462
 463                 /* It is possible that the Store already produced a return object */
 464
 465                 if (!walk_state->result_obj) {
 466                         /*
 467                          * Normally, we would remove a reference on the Operand[0]
 468                          * parameter; But since it is being used as the internal return
 469                          * object (meaning we would normally increment it), the two
 470                          * cancel out, and we simply don't do anything.
 471                          */
 472                         walk_state->result_obj = operand[0];
 473                         walk_state->operands[0] = NULL; /* Prevent deletion */
 474                 }
 475                 return_ACPI_STATUS(status);
 476
 477                 /*
 478                  * ACPI 2.0 Opcodes
 479                  */
 480         case AML_COPY_OP:       /* Copy (Source, Target) */
 481
 482                 status =
 483                     acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
 484                                                     walk_state);
 485                 break;
 486
 487         case AML_TO_DECSTRING_OP:       /* to_decimal_string (Data, Result) */
 488
 489                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
 490                                                    ACPI_EXPLICIT_CONVERT_DECIMAL);
 491                 if (return_desc == operand[0]) {
 492
 493                         /* No conversion performed, add ref to handle return value */
 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 = acpi_ex_convert_to_string(operand[0], &return_desc,
 501                                                    ACPI_EXPLICIT_CONVERT_HEX);
 502                 if (return_desc == operand[0]) {
 503
 504                         /* No conversion performed, add ref to handle return value */
 505                         acpi_ut_add_reference(return_desc);
 506                 }
 507                 break;
 508
 509         case AML_TO_BUFFER_OP:  /* to_buffer (Data, Result) */
 510
 511                 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
 512                 if (return_desc == operand[0]) {
 513
 514                         /* No conversion performed, add ref to handle return value */
 515                         acpi_ut_add_reference(return_desc);
 516                 }
 517                 break;
 518
 519         case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
 520
 521                 status = acpi_ex_convert_to_integer(operand[0], &return_desc,
 522                                                     ACPI_ANY_BASE);
 523                 if (return_desc == operand[0]) {
 524
 525                         /* No conversion performed, add ref to handle return value */
 526                         acpi_ut_add_reference(return_desc);
 527                 }
 528                 break;
 529
 530         case AML_SHIFT_LEFT_BIT_OP:     /* shift_left_bit (Source, bit_num) */
 531         case AML_SHIFT_RIGHT_BIT_OP:    /* shift_right_bit (Source, bit_num) */
 532
 533                 /* These are two obsolete opcodes */
 534
 535                 ACPI_ERROR((AE_INFO,
 536                             "%s is obsolete and not implemented",
 537                             acpi_ps_get_opcode_name(walk_state->opcode)));
 538                 status = AE_SUPPORT;
 539                 goto cleanup;
 540
 541         default:                /* Unknown opcode */
 542
 543                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 544                             walk_state->opcode));
 545                 status = AE_AML_BAD_OPCODE;
 546                 goto cleanup;
 547         }
 548
 549         if (ACPI_SUCCESS(status)) {
 550
 551                 /* Store the return value computed above into the target object */
 552
 553                 status = acpi_ex_store(return_desc, operand[1], walk_state);
 554         }
 555
 556       cleanup:
 557
 558         /* Delete return object on error */
 559
 560         if (ACPI_FAILURE(status)) {
 561                 acpi_ut_remove_reference(return_desc);
 562         }
 563
 564         /* Save return object on success */
 565
 566         else if (!walk_state->result_obj) {
 567                 walk_state->result_obj = return_desc;
 568         }
 569
 570         return_ACPI_STATUS(status);
 571 }
 572
 573 /*******************************************************************************
 574  *
 575  * FUNCTION:    acpi_ex_opcode_1A_0T_1R
 576  *
 577  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 578  *
 579  * RETURN:      Status
 580  *
 581  * DESCRIPTION: Execute opcode with one argument, no target, and a return value
 582  *
 583  ******************************************************************************/
 584
 585 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
 586 {
 587         union acpi_operand_object **operand = &walk_state->operands[0];
 588         union acpi_operand_object *temp_desc;
 589         union acpi_operand_object *return_desc = NULL;
 590         acpi_status status = AE_OK;
 591         u32 type;
 592         acpi_integer value;
 593
 594         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
 595                                 acpi_ps_get_opcode_name(walk_state->opcode));
 596
 597         /* Examine the AML opcode */
 598
 599         switch (walk_state->opcode) {
 600         case AML_LNOT_OP:       /* LNot (Operand) */
 601
 602                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 603                 if (!return_desc) {
 604                         status = AE_NO_MEMORY;
 605                         goto cleanup;
 606                 }
 607
 608                 /*
 609                  * Set result to ONES (TRUE) if Value == 0.  Note:
 610                  * return_desc->Integer.Value is initially == 0 (FALSE) from above.
 611                  */
 612                 if (!operand[0]->integer.value) {
 613                         return_desc->integer.value = ACPI_INTEGER_MAX;
 614                 }
 615                 break;
 616
 617         case AML_DECREMENT_OP:  /* Decrement (Operand)  */
 618         case AML_INCREMENT_OP:  /* Increment (Operand)  */
 619
 620                 /*
 621                  * Create a new integer.  Can't just get the base integer and
 622                  * increment it because it may be an Arg or Field.
 623                  */
 624                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 625                 if (!return_desc) {
 626                         status = AE_NO_MEMORY;
 627                         goto cleanup;
 628                 }
 629
 630                 /*
 631                  * Since we are expecting a Reference operand, it can be either a
 632                  * NS Node or an internal object.
 633                  */
 634                 temp_desc = operand[0];
 635                 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
 636                     ACPI_DESC_TYPE_OPERAND) {
 637
 638                         /* Internal reference object - prevent deletion */
 639
 640                         acpi_ut_add_reference(temp_desc);
 641                 }
 642
 643                 /*
 644                  * Convert the Reference operand to an Integer (This removes a
 645                  * reference on the Operand[0] object)
 646                  *
 647                  * NOTE:  We use LNOT_OP here in order to force resolution of the
 648                  * reference operand to an actual integer.
 649                  */
 650                 status =
 651                     acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
 652                                              walk_state);
 653                 if (ACPI_FAILURE(status)) {
 654                         ACPI_EXCEPTION((AE_INFO, status,
 655                                         "While resolving operands for [%s]",
 656                                         acpi_ps_get_opcode_name(walk_state->
 657                                                                 opcode)));
 658
 659                         goto cleanup;
 660                 }
 661
 662                 /*
 663                  * temp_desc is now guaranteed to be an Integer object --
 664                  * Perform the actual increment or decrement
 665                  */
 666                 if (walk_state->opcode == AML_INCREMENT_OP) {
 667                         return_desc->integer.value =
 668                             temp_desc->integer.value + 1;
 669                 } else {
 670                         return_desc->integer.value =
 671                             temp_desc->integer.value - 1;
 672                 }
 673
 674                 /* Finished with this Integer object */
 675
 676                 acpi_ut_remove_reference(temp_desc);
 677
 678                 /*
 679                  * Store the result back (indirectly) through the original
 680                  * Reference object
 681                  */
 682                 status = acpi_ex_store(return_desc, operand[0], walk_state);
 683                 break;
 684
 685         case AML_TYPE_OP:       /* object_type (source_object) */
 686
 687                 /*
 688                  * Note: The operand is not resolved at this point because we want to
 689                  * get the associated object, not its value.  For example, we don't
 690                  * want to resolve a field_unit to its value, we want the actual
 691                  * field_unit object.
 692                  */
 693
 694                 /* Get the type of the base object */
 695
 696                 status =
 697                     acpi_ex_resolve_multiple(walk_state, operand[0], &type,
 698                                              NULL);
 699                 if (ACPI_FAILURE(status)) {
 700                         goto cleanup;
 701                 }
 702
 703                 /* Allocate a descriptor to hold the type. */
 704
 705                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 706                 if (!return_desc) {
 707                         status = AE_NO_MEMORY;
 708                         goto cleanup;
 709                 }
 710
 711                 return_desc->integer.value = type;
 712                 break;
 713
 714         case AML_SIZE_OF_OP:    /* size_of (source_object) */
 715
 716                 /*
 717                  * Note: The operand is not resolved at this point because we want to
 718                  * get the associated object, not its value.
 719                  */
 720
 721                 /* Get the base object */
 722
 723                 status = acpi_ex_resolve_multiple(walk_state,
 724                                                   operand[0], &type,
 725                                                   &temp_desc);
 726                 if (ACPI_FAILURE(status)) {
 727                         goto cleanup;
 728                 }
 729
 730                 /*
 731                  * The type of the base object must be integer, buffer, string, or
 732                  * package.  All others are not supported.
 733                  *
 734                  * NOTE: Integer is not specifically supported by the ACPI spec,
 735                  * but is supported implicitly via implicit operand conversion.
 736                  * rather than bother with conversion, we just use the byte width
 737                  * global (4 or 8 bytes).
 738                  */
 739                 switch (type) {
 740                 case ACPI_TYPE_INTEGER:
 741                         value = acpi_gbl_integer_byte_width;
 742                         break;
 743
 744                 case ACPI_TYPE_STRING:
 745                         value = temp_desc->string.length;
 746                         break;
 747
 748                 case ACPI_TYPE_BUFFER:
 749
 750                         /* Buffer arguments may not be evaluated at this point */
 751
 752                         status = acpi_ds_get_buffer_arguments(temp_desc);
 753                         value = temp_desc->buffer.length;
 754                         break;
 755
 756                 case ACPI_TYPE_PACKAGE:
 757
 758                         /* Package arguments may not be evaluated at this point */
 759
 760                         status = acpi_ds_get_package_arguments(temp_desc);
 761                         value = temp_desc->package.count;
 762                         break;
 763
 764                 default:
 765                         ACPI_ERROR((AE_INFO,
 766                                     "Operand must be Buffer/Integer/String/Package - found type %s",
 767                                     acpi_ut_get_type_name(type)));
 768                         status = AE_AML_OPERAND_TYPE;
 769                         goto cleanup;
 770                 }
 771
 772                 if (ACPI_FAILURE(status)) {
 773                         goto cleanup;
 774                 }
 775
 776                 /*
 777                  * Now that we have the size of the object, create a result
 778                  * object to hold the value
 779                  */
 780                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 781                 if (!return_desc) {
 782                         status = AE_NO_MEMORY;
 783                         goto cleanup;
 784                 }
 785
 786                 return_desc->integer.value = value;
 787                 break;
 788
 789         case AML_REF_OF_OP:     /* ref_of (source_object) */
 790
 791                 status =
 792                     acpi_ex_get_object_reference(operand[0], &return_desc,
 793                                                  walk_state);
 794                 if (ACPI_FAILURE(status)) {
 795                         goto cleanup;
 796                 }
 797                 break;
 798
 799         case AML_DEREF_OF_OP:   /* deref_of (obj_reference | String) */
 800
 801                 /* Check for a method local or argument, or standalone String */
 802
 803                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
 804                     ACPI_DESC_TYPE_NAMED) {
 805                         temp_desc =
 806                             acpi_ns_get_attached_object((struct
 807                                                          acpi_namespace_node *)
 808                                                         operand[0]);
 809                         if (temp_desc
 810                             &&
 811                             ((ACPI_GET_OBJECT_TYPE(temp_desc) ==
 812                               ACPI_TYPE_STRING)
 813                              || (ACPI_GET_OBJECT_TYPE(temp_desc) ==
 814                                  ACPI_TYPE_LOCAL_REFERENCE))) {
 815                                 operand[0] = temp_desc;
 816                                 acpi_ut_add_reference(temp_desc);
 817                         } else {
 818                                 status = AE_AML_OPERAND_TYPE;
 819                                 goto cleanup;
 820                         }
 821                 } else {
 822                         switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
 823                         case ACPI_TYPE_LOCAL_REFERENCE:
 824                                 /*
 825                                  * This is a deref_of (local_x | arg_x)
 826                                  *
 827                                  * Must resolve/dereference the local/arg reference first
 828                                  */
 829                                 switch (operand[0]->reference.class) {
 830                                 case ACPI_REFCLASS_LOCAL:
 831                                 case ACPI_REFCLASS_ARG:
 832
 833                                         /* Set Operand[0] to the value of the local/arg */
 834
 835                                         status =
 836                                             acpi_ds_method_data_get_value
 837                                             (operand[0]->reference.class,
 838                                              operand[0]->reference.value,
 839                                              walk_state, &temp_desc);
 840                                         if (ACPI_FAILURE(status)) {
 841                                                 goto cleanup;
 842                                         }
 843
 844                                         /*
 845                                          * Delete our reference to the input object and
 846                                          * point to the object just retrieved
 847                                          */
 848                                         acpi_ut_remove_reference(operand[0]);
 849                                         operand[0] = temp_desc;
 850                                         break;
 851
 852                                 case ACPI_REFCLASS_REFOF:
 853
 854                                         /* Get the object to which the reference refers */
 855
 856                                         temp_desc =
 857                                             operand[0]->reference.object;
 858                                         acpi_ut_remove_reference(operand[0]);
 859                                         operand[0] = temp_desc;
 860                                         break;
 861
 862                                 default:
 863
 864                                         /* Must be an Index op - handled below */
 865                                         break;
 866                                 }
 867                                 break;
 868
 869                         case ACPI_TYPE_STRING:
 870                                 break;
 871
 872                         default:
 873                                 status = AE_AML_OPERAND_TYPE;
 874                                 goto cleanup;
 875                         }
 876                 }
 877
 878                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
 879                     ACPI_DESC_TYPE_NAMED) {
 880                         if (ACPI_GET_OBJECT_TYPE(operand[0]) ==
 881                             ACPI_TYPE_STRING) {
 882                                 /*
 883                                  * This is a deref_of (String). The string is a reference
 884                                  * to a named ACPI object.
 885                                  *
 886                                  * 1) Find the owning Node
 887                                  * 2) Dereference the node to an actual object. Could be a
 888                                  *    Field, so we need to resolve the node to a value.
 889                                  */
 890                                 status =
 891                                     acpi_ns_get_node(walk_state->scope_info->
 892                                                      scope.node,
 893                                                      operand[0]->string.pointer,
 894                                                      ACPI_NS_SEARCH_PARENT,
 895                                                      ACPI_CAST_INDIRECT_PTR
 896                                                      (struct
 897                                                       acpi_namespace_node,
 898                                                       &return_desc));
 899                                 if (ACPI_FAILURE(status)) {
 900                                         goto cleanup;
 901                                 }
 902
 903                                 status =
 904                                     acpi_ex_resolve_node_to_value
 905                                     (ACPI_CAST_INDIRECT_PTR
 906                                      (struct acpi_namespace_node, &return_desc),
 907                                      walk_state);
 908                                 goto cleanup;
 909                         }
 910                 }
 911
 912                 /* Operand[0] may have changed from the code above */
 913
 914                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
 915                     ACPI_DESC_TYPE_NAMED) {
 916                         /*
 917                          * This is a deref_of (object_reference)
 918                          * Get the actual object from the Node (This is the dereference).
 919                          * This case may only happen when a local_x or arg_x is
 920                          * dereferenced above.
 921                          */
 922                         return_desc = acpi_ns_get_attached_object((struct
 923                                                                    acpi_namespace_node
 924                                                                    *)
 925                                                                   operand[0]);
 926                         acpi_ut_add_reference(return_desc);
 927                 } else {
 928                         /*
 929                          * This must be a reference object produced by either the
 930                          * Index() or ref_of() operator
 931                          */
 932                         switch (operand[0]->reference.class) {
 933                         case ACPI_REFCLASS_INDEX:
 934
 935                                 /*
 936                                  * The target type for the Index operator must be
 937                                  * either a Buffer or a Package
 938                                  */
 939                                 switch (operand[0]->reference.target_type) {
 940                                 case ACPI_TYPE_BUFFER_FIELD:
 941
 942                                         temp_desc =
 943                                             operand[0]->reference.object;
 944
 945                                         /*
 946                                          * Create a new object that contains one element of the
 947                                          * buffer -- the element pointed to by the index.
 948                                          *
 949                                          * NOTE: index into a buffer is NOT a pointer to a
 950                                          * sub-buffer of the main buffer, it is only a pointer to a
 951                                          * single element (byte) of the buffer!
 952                                          */
 953                                         return_desc =
 954                                             acpi_ut_create_internal_object
 955                                             (ACPI_TYPE_INTEGER);
 956                                         if (!return_desc) {
 957                                                 status = AE_NO_MEMORY;
 958                                                 goto cleanup;
 959                                         }
 960
 961                                         /*
 962                                          * Since we are returning the value of the buffer at the
 963                                          * indexed location, we don't need to add an additional
 964                                          * reference to the buffer itself.
 965                                          */
 966                                         return_desc->integer.value =
 967                                             temp_desc->buffer.
 968                                             pointer[operand[0]->reference.
 969                                                     value];
 970                                         break;
 971
 972                                 case ACPI_TYPE_PACKAGE:
 973
 974                                         /*
 975                                          * Return the referenced element of the package.  We must
 976                                          * add another reference to the referenced object, however.
 977                                          */
 978                                         return_desc =
 979                                             *(operand[0]->reference.where);
 980                                         if (return_desc) {
 981                                                 acpi_ut_add_reference
 982                                                     (return_desc);
 983                                         }
 984                                         break;
 985
 986                                 default:
 987
 988                                         ACPI_ERROR((AE_INFO,
 989                                                     "Unknown Index TargetType %X in reference object %p",
 990                                                     operand[0]->reference.
 991                                                     target_type, operand[0]));
 992                                         status = AE_AML_OPERAND_TYPE;
 993                                         goto cleanup;
 994                                 }
 995                                 break;
 996
 997                         case ACPI_REFCLASS_REFOF:
 998
 999                                 return_desc = operand[0]->reference.object;
1000
1001                                 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
1002                                     ACPI_DESC_TYPE_NAMED) {
1003                                         return_desc =
1004                                             acpi_ns_get_attached_object((struct
1005                                                                          acpi_namespace_node
1006                                                                          *)
1007                                                                         return_desc);
1008                                 }
1009
1010                                 /* Add another reference to the object! */
1011
1012                                 acpi_ut_add_reference(return_desc);
1013                                 break;
1014
1015                         default:
1016                                 ACPI_ERROR((AE_INFO,
1017                                             "Unknown class in reference(%p) - %2.2X",
1018                                             operand[0],
1019                                             operand[0]->reference.class));
1020
1021                                 status = AE_TYPE;
1022                                 goto cleanup;
1023                         }
1024                 }
1025                 break;
1026
1027         default:
1028
1029                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
1030                             walk_state->opcode));
1031                 status = AE_AML_BAD_OPCODE;
1032                 goto cleanup;
1033         }
1034
1035       cleanup:
1036
1037         /* Delete return object on error */
1038
1039         if (ACPI_FAILURE(status)) {
1040                 acpi_ut_remove_reference(return_desc);
1041         }
1042
1043         /* Save return object on success */
1044
1045         else {
1046                 walk_state->result_obj = return_desc;
1047         }
1048
1049         return_ACPI_STATUS(status);
1050 }