err.no Git - linux-2.6/blob - drivers/acpi/executer/exoparg1.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exoparg1 - AML execution - opcodes with 1 argument
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2007, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acparser.h>
  47 #include <acpi/acdispat.h>
  48 #include <acpi/acinterp.h>
  49 #include <acpi/amlcode.h>
  50 #include <acpi/acnamesp.h>
  51
  52 #define _COMPONENT          ACPI_EXECUTER
  53 ACPI_MODULE_NAME("exoparg1")
  54
  55 /*!
  56  * Naming convention for AML interpreter execution routines.
  57  *
  58  * The routines that begin execution of AML opcodes are named with a common
  59  * convention based upon the number of arguments, the number of target operands,
  60  * and whether or not a value is returned:
  61  *
  62  *      AcpiExOpcode_xA_yT_zR
  63  *
  64  * Where:
  65  *
  66  * xA - ARGUMENTS:    The number of arguments (input operands) that are
  67  *                    required for this opcode type (0 through 6 args).
  68  * yT - TARGETS:      The number of targets (output operands) that are required
  69  *                    for this opcode type (0, 1, or 2 targets).
  70  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
  71  *                    as the function return (0 or 1).
  72  *
  73  * The AcpiExOpcode* functions are called via the Dispatcher component with
  74  * fully resolved operands.
  75 !*/
  76 /*******************************************************************************
  77  *
  78  * FUNCTION:    acpi_ex_opcode_0A_0T_1R
  79  *
  80  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
  81  *
  82  * RETURN:      Status
  83  *
  84  * DESCRIPTION: Execute operator with no operands, one return value
  85  *
  86  ******************************************************************************/
  87 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
  88 {
  89         acpi_status status = AE_OK;
  90         union acpi_operand_object *return_desc = NULL;
  91
  92         ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
  93                                 acpi_ps_get_opcode_name(walk_state->opcode));
  94
  95         /* Examine the AML opcode */
  96
  97         switch (walk_state->opcode) {
  98         case AML_TIMER_OP:      /*  Timer () */
  99
 100                 /* Create a return object of type Integer */
 101
 102                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 103                 if (!return_desc) {
 104                         status = AE_NO_MEMORY;
 105                         goto cleanup;
 106                 }
 107                 return_desc->integer.value = acpi_os_get_timer();
 108                 break;
 109
 110         default:                /*  Unknown opcode  */
 111
 112                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %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         } else {
 125                 /* Save the return value */
 126
 127                 walk_state->result_obj = return_desc;
 128         }
 129
 130         return_ACPI_STATUS(status);
 131 }
 132
 133 /*******************************************************************************
 134  *
 135  * FUNCTION:    acpi_ex_opcode_1A_0T_0R
 136  *
 137  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 138  *
 139  * RETURN:      Status
 140  *
 141  * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
 142  *              object stack
 143  *
 144  ******************************************************************************/
 145
 146 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
 147 {
 148         union acpi_operand_object **operand = &walk_state->operands[0];
 149         acpi_status status = AE_OK;
 150
 151         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
 152                                 acpi_ps_get_opcode_name(walk_state->opcode));
 153
 154         /* Examine the AML opcode */
 155
 156         switch (walk_state->opcode) {
 157         case AML_RELEASE_OP:    /*  Release (mutex_object) */
 158
 159                 status = acpi_ex_release_mutex(operand[0], walk_state);
 160                 break;
 161
 162         case AML_RESET_OP:      /*  Reset (event_object) */
 163
 164                 status = acpi_ex_system_reset_event(operand[0]);
 165                 break;
 166
 167         case AML_SIGNAL_OP:     /*  Signal (event_object) */
 168
 169                 status = acpi_ex_system_signal_event(operand[0]);
 170                 break;
 171
 172         case AML_SLEEP_OP:      /*  Sleep (msec_time) */
 173
 174                 status = acpi_ex_system_do_suspend(operand[0]->integer.value);
 175                 break;
 176
 177         case AML_STALL_OP:      /*  Stall (usec_time) */
 178
 179                 status =
 180                     acpi_ex_system_do_stall((u32) operand[0]->integer.value);
 181                 break;
 182
 183         case AML_UNLOAD_OP:     /*  Unload (Handle) */
 184
 185                 status = acpi_ex_unload_table(operand[0]);
 186                 break;
 187
 188         default:                /*  Unknown opcode  */
 189
 190                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 191                             walk_state->opcode));
 192                 status = AE_AML_BAD_OPCODE;
 193                 break;
 194         }
 195
 196         return_ACPI_STATUS(status);
 197 }
 198
 199 /*******************************************************************************
 200  *
 201  * FUNCTION:    acpi_ex_opcode_1A_1T_0R
 202  *
 203  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 204  *
 205  * RETURN:      Status
 206  *
 207  * DESCRIPTION: Execute opcode with one argument, one target, and no
 208  *              return value.
 209  *
 210  ******************************************************************************/
 211
 212 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
 213 {
 214         acpi_status status = AE_OK;
 215         union acpi_operand_object **operand = &walk_state->operands[0];
 216
 217         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
 218                                 acpi_ps_get_opcode_name(walk_state->opcode));
 219
 220         /* Examine the AML opcode */
 221
 222         switch (walk_state->opcode) {
 223         case AML_LOAD_OP:
 224
 225                 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
 226                 break;
 227
 228         default:                /* Unknown opcode */
 229
 230                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 231                             walk_state->opcode));
 232                 status = AE_AML_BAD_OPCODE;
 233                 goto cleanup;
 234         }
 235
 236       cleanup:
 237
 238         return_ACPI_STATUS(status);
 239 }
 240
 241 /*******************************************************************************
 242  *
 243  * FUNCTION:    acpi_ex_opcode_1A_1T_1R
 244  *
 245  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 246  *
 247  * RETURN:      Status
 248  *
 249  * DESCRIPTION: Execute opcode with one argument, one target, and a
 250  *              return value.
 251  *
 252  ******************************************************************************/
 253
 254 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
 255 {
 256         acpi_status status = AE_OK;
 257         union acpi_operand_object **operand = &walk_state->operands[0];
 258         union acpi_operand_object *return_desc = NULL;
 259         union acpi_operand_object *return_desc2 = NULL;
 260         u32 temp32;
 261         u32 i;
 262         acpi_integer power_of_ten;
 263         acpi_integer digit;
 264
 265         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
 266                                 acpi_ps_get_opcode_name(walk_state->opcode));
 267
 268         /* Examine the AML opcode */
 269
 270         switch (walk_state->opcode) {
 271         case AML_BIT_NOT_OP:
 272         case AML_FIND_SET_LEFT_BIT_OP:
 273         case AML_FIND_SET_RIGHT_BIT_OP:
 274         case AML_FROM_BCD_OP:
 275         case AML_TO_BCD_OP:
 276         case AML_COND_REF_OF_OP:
 277
 278                 /* Create a return object of type Integer for these opcodes */
 279
 280                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 281                 if (!return_desc) {
 282                         status = AE_NO_MEMORY;
 283                         goto cleanup;
 284                 }
 285
 286                 switch (walk_state->opcode) {
 287                 case AML_BIT_NOT_OP:    /* Not (Operand, Result)  */
 288
 289                         return_desc->integer.value = ~operand[0]->integer.value;
 290                         break;
 291
 292                 case AML_FIND_SET_LEFT_BIT_OP:  /* find_set_left_bit (Operand, Result) */
 293
 294                         return_desc->integer.value = operand[0]->integer.value;
 295
 296                         /*
 297                          * Acpi specification describes Integer type as a little
 298                          * endian unsigned value, so this boundary condition is valid.
 299                          */
 300                         for (temp32 = 0; return_desc->integer.value &&
 301                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 302                                 return_desc->integer.value >>= 1;
 303                         }
 304
 305                         return_desc->integer.value = temp32;
 306                         break;
 307
 308                 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
 309
 310                         return_desc->integer.value = operand[0]->integer.value;
 311
 312                         /*
 313                          * The Acpi specification describes Integer type as a little
 314                          * endian unsigned value, so this boundary condition is valid.
 315                          */
 316                         for (temp32 = 0; return_desc->integer.value &&
 317                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 318                                 return_desc->integer.value <<= 1;
 319                         }
 320
 321                         /* Since the bit position is one-based, subtract from 33 (65) */
 322
 323                         return_desc->integer.value =
 324                             temp32 ==
 325                             0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
 326                         break;
 327
 328                 case AML_FROM_BCD_OP:   /* from_bcd (BCDValue, Result) */
 329
 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                                     (((acpi_integer) 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                                     (((acpi_integer) 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: %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                         /*
 411                          * This op is a little strange because the internal return value is
 412                          * different than the return value stored in the result descriptor
 413                          * (There are really two return values)
 414                          */
 415                         if ((struct acpi_namespace_node *)operand[0] ==
 416                             acpi_gbl_root_node) {
 417                                 /*
 418                                  * This means that the object does not exist in the namespace,
 419                                  * return FALSE
 420                                  */
 421                                 return_desc->integer.value = 0;
 422                                 goto cleanup;
 423                         }
 424
 425                         /* Get the object reference, store it, and remove our reference */
 426
 427                         status = acpi_ex_get_object_reference(operand[0],
 428                                                               &return_desc2,
 429                                                               walk_state);
 430                         if (ACPI_FAILURE(status)) {
 431                                 goto cleanup;
 432                         }
 433
 434                         status =
 435                             acpi_ex_store(return_desc2, operand[1], walk_state);
 436                         acpi_ut_remove_reference(return_desc2);
 437
 438                         /* The object exists in the namespace, return TRUE */
 439
 440                         return_desc->integer.value = ACPI_INTEGER_MAX;
 441                         goto cleanup;
 442
 443                 default:
 444                         /* No other opcodes get here */
 445                         break;
 446                 }
 447                 break;
 448
 449         case AML_STORE_OP:      /* Store (Source, Target) */
 450
 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 = acpi_ex_convert_to_string(operand[0], &return_desc,
 488                                                    ACPI_EXPLICIT_CONVERT_DECIMAL);
 489                 if (return_desc == operand[0]) {
 490
 491                         /* No conversion performed, add ref to handle return value */
 492                         acpi_ut_add_reference(return_desc);
 493                 }
 494                 break;
 495
 496         case AML_TO_HEXSTRING_OP:       /* to_hex_string (Data, Result) */
 497
 498                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
 499                                                    ACPI_EXPLICIT_CONVERT_HEX);
 500                 if (return_desc == operand[0]) {
 501
 502                         /* No conversion performed, add ref to handle return value */
 503                         acpi_ut_add_reference(return_desc);
 504                 }
 505                 break;
 506
 507         case AML_TO_BUFFER_OP:  /* to_buffer (Data, Result) */
 508
 509                 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
 510                 if (return_desc == operand[0]) {
 511
 512                         /* No conversion performed, add ref to handle return value */
 513                         acpi_ut_add_reference(return_desc);
 514                 }
 515                 break;
 516
 517         case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
 518
 519                 status = acpi_ex_convert_to_integer(operand[0], &return_desc,
 520                                                     ACPI_ANY_BASE);
 521                 if (return_desc == operand[0]) {
 522
 523                         /* No conversion performed, add ref to handle return value */
 524                         acpi_ut_add_reference(return_desc);
 525                 }
 526                 break;
 527
 528         case AML_SHIFT_LEFT_BIT_OP:     /* shift_left_bit (Source, bit_num) */
 529         case AML_SHIFT_RIGHT_BIT_OP:    /* shift_right_bit (Source, bit_num) */
 530
 531                 /* These are two obsolete opcodes */
 532
 533                 ACPI_ERROR((AE_INFO,
 534                             "%s is obsolete and not implemented",
 535                             acpi_ps_get_opcode_name(walk_state->opcode)));
 536                 status = AE_SUPPORT;
 537                 goto cleanup;
 538
 539         default:                /* Unknown opcode */
 540
 541                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 542                             walk_state->opcode));
 543                 status = AE_AML_BAD_OPCODE;
 544                 goto cleanup;
 545         }
 546
 547         if (ACPI_SUCCESS(status)) {
 548
 549                 /* Store the return value computed above into the target object */
 550
 551                 status = acpi_ex_store(return_desc, operand[1], walk_state);
 552         }
 553
 554       cleanup:
 555
 556         /* Delete return object on error */
 557
 558         if (ACPI_FAILURE(status)) {
 559                 acpi_ut_remove_reference(return_desc);
 560         }
 561
 562         /* Save return object on success */
 563
 564         else if (!walk_state->result_obj) {
 565                 walk_state->result_obj = return_desc;
 566         }
 567
 568         return_ACPI_STATUS(status);
 569 }
 570
 571 /*******************************************************************************
 572  *
 573  * FUNCTION:    acpi_ex_opcode_1A_0T_1R
 574  *
 575  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 576  *
 577  * RETURN:      Status
 578  *
 579  * DESCRIPTION: Execute opcode with one argument, no target, and a return value
 580  *
 581  ******************************************************************************/
 582
 583 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
 584 {
 585         union acpi_operand_object **operand = &walk_state->operands[0];
 586         union acpi_operand_object *temp_desc;
 587         union acpi_operand_object *return_desc = NULL;
 588         acpi_status status = AE_OK;
 589         u32 type;
 590         acpi_integer value;
 591
 592         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
 593                                 acpi_ps_get_opcode_name(walk_state->opcode));
 594
 595         /* Examine the AML opcode */
 596
 597         switch (walk_state->opcode) {
 598         case AML_LNOT_OP:       /* LNot (Operand) */
 599
 600                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 601                 if (!return_desc) {
 602                         status = AE_NO_MEMORY;
 603                         goto cleanup;
 604                 }
 605
 606                 /*
 607                  * Set result to ONES (TRUE) if Value == 0.  Note:
 608                  * return_desc->Integer.Value is initially == 0 (FALSE) from above.
 609                  */
 610                 if (!operand[0]->integer.value) {
 611                         return_desc->integer.value = ACPI_INTEGER_MAX;
 612                 }
 613                 break;
 614
 615         case AML_DECREMENT_OP:  /* Decrement (Operand)  */
 616         case AML_INCREMENT_OP:  /* Increment (Operand)  */
 617
 618                 /*
 619                  * Create a new integer.  Can't just get the base integer and
 620                  * increment it because it may be an Arg or Field.
 621                  */
 622                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 623                 if (!return_desc) {
 624                         status = AE_NO_MEMORY;
 625                         goto cleanup;
 626                 }
 627
 628                 /*
 629                  * Since we are expecting a Reference operand, it can be either a
 630                  * NS Node or an internal object.
 631                  */
 632                 temp_desc = operand[0];
 633                 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
 634                     ACPI_DESC_TYPE_OPERAND) {
 635
 636                         /* Internal reference object - prevent deletion */
 637
 638                         acpi_ut_add_reference(temp_desc);
 639                 }
 640
 641                 /*
 642                  * Convert the Reference operand to an Integer (This removes a
 643                  * reference on the Operand[0] object)
 644                  *
 645                  * NOTE:  We use LNOT_OP here in order to force resolution of the
 646                  * reference operand to an actual integer.
 647                  */
 648                 status =
 649                     acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
 650                                              walk_state);
 651                 if (ACPI_FAILURE(status)) {
 652                         ACPI_EXCEPTION((AE_INFO, status,
 653                                         "While resolving operands for [%s]",
 654                                         acpi_ps_get_opcode_name(walk_state->
 655                                                                 opcode)));
 656
 657                         goto cleanup;
 658                 }
 659
 660                 /*
 661                  * temp_desc is now guaranteed to be an Integer object --
 662                  * Perform the actual increment or decrement
 663                  */
 664                 if (walk_state->opcode == AML_INCREMENT_OP) {
 665                         return_desc->integer.value =
 666                             temp_desc->integer.value + 1;
 667                 } else {
 668                         return_desc->integer.value =
 669                             temp_desc->integer.value - 1;
 670                 }
 671
 672                 /* Finished with this Integer object */
 673
 674                 acpi_ut_remove_reference(temp_desc);
 675
 676                 /*
 677                  * Store the result back (indirectly) through the original
 678                  * Reference object
 679                  */
 680                 status = acpi_ex_store(return_desc, operand[0], walk_state);
 681                 break;
 682
 683         case AML_TYPE_OP:       /* object_type (source_object) */
 684
 685                 /*
 686                  * Note: The operand is not resolved at this point because we want to
 687                  * get the associated object, not its value.  For example, we don't
 688                  * want to resolve a field_unit to its value, we want the actual
 689                  * field_unit object.
 690                  */
 691
 692                 /* Get the type of the base object */
 693
 694                 status =
 695                     acpi_ex_resolve_multiple(walk_state, operand[0], &type,
 696                                              NULL);
 697                 if (ACPI_FAILURE(status)) {
 698                         goto cleanup;
 699                 }
 700
 701                 /* Allocate a descriptor to hold the type. */
 702
 703                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 704                 if (!return_desc) {
 705                         status = AE_NO_MEMORY;
 706                         goto cleanup;
 707                 }
 708
 709                 return_desc->integer.value = type;
 710                 break;
 711
 712         case AML_SIZE_OF_OP:    /* size_of (source_object) */
 713
 714                 /*
 715                  * Note: The operand is not resolved at this point because we want to
 716                  * get the associated object, not its value.
 717                  */
 718
 719                 /* Get the base object */
 720
 721                 status = acpi_ex_resolve_multiple(walk_state,
 722                                                   operand[0], &type,
 723                                                   &temp_desc);
 724                 if (ACPI_FAILURE(status)) {
 725                         goto cleanup;
 726                 }
 727
 728                 /*
 729                  * The type of the base object must be integer, buffer, string, or
 730                  * package.  All others are not supported.
 731                  *
 732                  * NOTE: Integer is not specifically supported by the ACPI spec,
 733                  * but is supported implicitly via implicit operand conversion.
 734                  * rather than bother with conversion, we just use the byte width
 735                  * global (4 or 8 bytes).
 736                  */
 737                 switch (type) {
 738                 case ACPI_TYPE_INTEGER:
 739                         value = acpi_gbl_integer_byte_width;
 740                         break;
 741
 742                 case ACPI_TYPE_BUFFER:
 743                         value = temp_desc->buffer.length;
 744                         break;
 745
 746                 case ACPI_TYPE_STRING:
 747                         value = temp_desc->string.length;
 748                         break;
 749
 750                 case ACPI_TYPE_PACKAGE:
 751                         value = temp_desc->package.count;
 752                         break;
 753
 754                 default:
 755                         ACPI_ERROR((AE_INFO,
 756                                     "Operand is not Buf/Int/Str/Pkg - found type %s",
 757                                     acpi_ut_get_type_name(type)));
 758                         status = AE_AML_OPERAND_TYPE;
 759                         goto cleanup;
 760                 }
 761
 762                 /*
 763                  * Now that we have the size of the object, create a result
 764                  * object to hold the value
 765                  */
 766                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 767                 if (!return_desc) {
 768                         status = AE_NO_MEMORY;
 769                         goto cleanup;
 770                 }
 771
 772                 return_desc->integer.value = value;
 773                 break;
 774
 775         case AML_REF_OF_OP:     /* ref_of (source_object) */
 776
 777                 status =
 778                     acpi_ex_get_object_reference(operand[0], &return_desc,
 779                                                  walk_state);
 780                 if (ACPI_FAILURE(status)) {
 781                         goto cleanup;
 782                 }
 783                 break;
 784
 785         case AML_DEREF_OF_OP:   /* deref_of (obj_reference | String) */
 786
 787                 /* Check for a method local or argument, or standalone String */
 788
 789                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
 790                     ACPI_DESC_TYPE_NAMED) {
 791                         temp_desc =
 792                             acpi_ns_get_attached_object((struct
 793                                                          acpi_namespace_node *)
 794                                                         operand[0]);
 795                         if (temp_desc
 796                             &&
 797                             ((ACPI_GET_OBJECT_TYPE(temp_desc) ==
 798                               ACPI_TYPE_STRING)
 799                              || (ACPI_GET_OBJECT_TYPE(temp_desc) ==
 800                                  ACPI_TYPE_LOCAL_REFERENCE))) {
 801                                 operand[0] = temp_desc;
 802                                 acpi_ut_add_reference(temp_desc);
 803                         } else {
 804                                 status = AE_AML_OPERAND_TYPE;
 805                                 goto cleanup;
 806                         }
 807                 } else {
 808                         switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
 809                         case ACPI_TYPE_LOCAL_REFERENCE:
 810                                 /*
 811                                  * This is a deref_of (local_x | arg_x)
 812                                  *
 813                                  * Must resolve/dereference the local/arg reference first
 814                                  */
 815                                 switch (operand[0]->reference.opcode) {
 816                                 case AML_LOCAL_OP:
 817                                 case AML_ARG_OP:
 818
 819                                         /* Set Operand[0] to the value of the local/arg */
 820
 821                                         status =
 822                                             acpi_ds_method_data_get_value
 823                                             (operand[0]->reference.opcode,
 824                                              operand[0]->reference.offset,
 825                                              walk_state, &temp_desc);
 826                                         if (ACPI_FAILURE(status)) {
 827                                                 goto cleanup;
 828                                         }
 829
 830                                         /*
 831                                          * Delete our reference to the input object and
 832                                          * point to the object just retrieved
 833                                          */
 834                                         acpi_ut_remove_reference(operand[0]);
 835                                         operand[0] = temp_desc;
 836                                         break;
 837
 838                                 case AML_REF_OF_OP:
 839
 840                                         /* Get the object to which the reference refers */
 841
 842                                         temp_desc =
 843                                             operand[0]->reference.object;
 844                                         acpi_ut_remove_reference(operand[0]);
 845                                         operand[0] = temp_desc;
 846                                         break;
 847
 848                                 default:
 849
 850                                         /* Must be an Index op - handled below */
 851                                         break;
 852                                 }
 853                                 break;
 854
 855                         case ACPI_TYPE_STRING:
 856                                 break;
 857
 858                         default:
 859                                 status = AE_AML_OPERAND_TYPE;
 860                                 goto cleanup;
 861                         }
 862                 }
 863
 864                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
 865                     ACPI_DESC_TYPE_NAMED) {
 866                         if (ACPI_GET_OBJECT_TYPE(operand[0]) ==
 867                             ACPI_TYPE_STRING) {
 868                                 /*
 869                                  * This is a deref_of (String). The string is a reference
 870                                  * to a named ACPI object.
 871                                  *
 872                                  * 1) Find the owning Node
 873                                  * 2) Dereference the node to an actual object. Could be a
 874                                  *    Field, so we need to resolve the node to a value.
 875                                  */
 876                                 status =
 877                                     acpi_ns_get_node(walk_state->scope_info->
 878                                                      scope.node,
 879                                                      operand[0]->string.pointer,
 880                                                      ACPI_NS_SEARCH_PARENT,
 881                                                      ACPI_CAST_INDIRECT_PTR
 882                                                      (struct
 883                                                       acpi_namespace_node,
 884                                                       &return_desc));
 885                                 if (ACPI_FAILURE(status)) {
 886                                         goto cleanup;
 887                                 }
 888
 889                                 status =
 890                                     acpi_ex_resolve_node_to_value
 891                                     (ACPI_CAST_INDIRECT_PTR
 892                                      (struct acpi_namespace_node, &return_desc),
 893                                      walk_state);
 894                                 goto cleanup;
 895                         }
 896                 }
 897
 898                 /* Operand[0] may have changed from the code above */
 899
 900                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
 901                     ACPI_DESC_TYPE_NAMED) {
 902                         /*
 903                          * This is a deref_of (object_reference)
 904                          * Get the actual object from the Node (This is the dereference).
 905                          * This case may only happen when a local_x or arg_x is
 906                          * dereferenced above.
 907                          */
 908                         return_desc = acpi_ns_get_attached_object((struct
 909                                                                    acpi_namespace_node
 910                                                                    *)
 911                                                                   operand[0]);
 912                         acpi_ut_add_reference(return_desc);
 913                 } else {
 914                         /*
 915                          * This must be a reference object produced by either the
 916                          * Index() or ref_of() operator
 917                          */
 918                         switch (operand[0]->reference.opcode) {
 919                         case AML_INDEX_OP:
 920
 921                                 /*
 922                                  * The target type for the Index operator must be
 923                                  * either a Buffer or a Package
 924                                  */
 925                                 switch (operand[0]->reference.target_type) {
 926                                 case ACPI_TYPE_BUFFER_FIELD:
 927
 928                                         temp_desc =
 929                                             operand[0]->reference.object;
 930
 931                                         /*
 932                                          * Create a new object that contains one element of the
 933                                          * buffer -- the element pointed to by the index.
 934                                          *
 935                                          * NOTE: index into a buffer is NOT a pointer to a
 936                                          * sub-buffer of the main buffer, it is only a pointer to a
 937                                          * single element (byte) of the buffer!
 938                                          */
 939                                         return_desc =
 940                                             acpi_ut_create_internal_object
 941                                             (ACPI_TYPE_INTEGER);
 942                                         if (!return_desc) {
 943                                                 status = AE_NO_MEMORY;
 944                                                 goto cleanup;
 945                                         }
 946
 947                                         /*
 948                                          * Since we are returning the value of the buffer at the
 949                                          * indexed location, we don't need to add an additional
 950                                          * reference to the buffer itself.
 951                                          */
 952                                         return_desc->integer.value =
 953                                             temp_desc->buffer.
 954                                             pointer[operand[0]->reference.
 955                                                     offset];
 956                                         break;
 957
 958                                 case ACPI_TYPE_PACKAGE:
 959
 960                                         /*
 961                                          * Return the referenced element of the package.  We must
 962                                          * add another reference to the referenced object, however.
 963                                          */
 964                                         return_desc =
 965                                             *(operand[0]->reference.where);
 966                                         if (return_desc) {
 967                                                 acpi_ut_add_reference
 968                                                     (return_desc);
 969                                         }
 970                                         break;
 971
 972                                 default:
 973
 974                                         ACPI_ERROR((AE_INFO,
 975                                                     "Unknown Index TargetType %X in obj %p",
 976                                                     operand[0]->reference.
 977                                                     target_type, operand[0]));
 978                                         status = AE_AML_OPERAND_TYPE;
 979                                         goto cleanup;
 980                                 }
 981                                 break;
 982
 983                         case AML_REF_OF_OP:
 984
 985                                 return_desc = operand[0]->reference.object;
 986
 987                                 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
 988                                     ACPI_DESC_TYPE_NAMED) {
 989                                         return_desc =
 990                                             acpi_ns_get_attached_object((struct
 991                                                                          acpi_namespace_node
 992                                                                          *)
 993                                                                         return_desc);
 994                                 }
 995
 996                                 /* Add another reference to the object! */
 997
 998                                 acpi_ut_add_reference(return_desc);
 999                                 break;
1000
1001                         default:
1002                                 ACPI_ERROR((AE_INFO,
1003                                             "Unknown opcode in reference(%p) - %X",
1004                                             operand[0],
1005                                             operand[0]->reference.opcode));
1006
1007                                 status = AE_TYPE;
1008                                 goto cleanup;
1009                         }
1010                 }
1011                 break;
1012
1013         default:
1014
1015                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
1016                             walk_state->opcode));
1017                 status = AE_AML_BAD_OPCODE;
1018                 goto cleanup;
1019         }
1020
1021       cleanup:
1022
1023         /* Delete return object on error */
1024
1025         if (ACPI_FAILURE(status)) {
1026                 acpi_ut_remove_reference(return_desc);
1027         }
1028
1029         /* Save return object on success */
1030
1031         else {
1032                 walk_state->result_obj = return_desc;
1033         }
1034
1035         return_ACPI_STATUS(status);
1036 }