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 - 2005, 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
  46 #include <acpi/acpi.h>
  47 #include <acpi/acparser.h>
  48 #include <acpi/acdispat.h>
  49 #include <acpi/acinterp.h>
  50 #include <acpi/amlcode.h>
  51 #include <acpi/acnamesp.h>
  52
  53
  54 #define _COMPONENT          ACPI_EXECUTER
  55          ACPI_MODULE_NAME    ("exoparg1")
  56
  57
  58 /*!
  59  * Naming convention for AML interpreter execution routines.
  60  *
  61  * The routines that begin execution of AML opcodes are named with a common
  62  * convention based upon the number of arguments, the number of target operands,
  63  * and whether or not a value is returned:
  64  *
  65  *      AcpiExOpcode_xA_yT_zR
  66  *
  67  * Where:
  68  *
  69  * xA - ARGUMENTS:    The number of arguments (input operands) that are
  70  *                    required for this opcode type (0 through 6 args).
  71  * yT - TARGETS:      The number of targets (output operands) that are required
  72  *                    for this opcode type (0, 1, or 2 targets).
  73  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
  74  *                    as the function return (0 or 1).
  75  *
  76  * The AcpiExOpcode* functions are called via the Dispatcher component with
  77  * fully resolved operands.
  78 !*/
  79
  80 /*******************************************************************************
  81  *
  82  * FUNCTION:    acpi_ex_opcode_0A_0T_1R
  83  *
  84  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
  85  *
  86  * RETURN:      Status
  87  *
  88  * DESCRIPTION: Execute operator with no operands, one return value
  89  *
  90  ******************************************************************************/
  91
  92 acpi_status
  93 acpi_ex_opcode_0A_0T_1R (
  94         struct acpi_walk_state          *walk_state)
  95 {
  96         acpi_status                     status = AE_OK;
  97         union acpi_operand_object       *return_desc = NULL;
  98
  99
 100         ACPI_FUNCTION_TRACE_STR ("ex_opcode_0A_0T_1R",
 101                 acpi_ps_get_opcode_name (walk_state->opcode));
 102
 103
 104         /* Examine the AML opcode */
 105
 106         switch (walk_state->opcode) {
 107         case AML_TIMER_OP:      /*  Timer () */
 108
 109                 /* Create a return object of type Integer */
 110
 111                 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
 112                 if (!return_desc) {
 113                         status = AE_NO_MEMORY;
 114                         goto cleanup;
 115                 }
 116
 117                 return_desc->integer.value = acpi_os_get_timer ();
 118                 break;
 119
 120         default:                /*  Unknown opcode  */
 121
 122                 ACPI_REPORT_ERROR (("acpi_ex_opcode_0A_0T_1R: Unknown opcode %X\n",
 123                         walk_state->opcode));
 124                 status = AE_AML_BAD_OPCODE;
 125                 break;
 126         }
 127
 128 cleanup:
 129
 130         /* Delete return object on error */
 131
 132         if ((ACPI_FAILURE (status)) || walk_state->result_obj) {
 133                 acpi_ut_remove_reference (return_desc);
 134         }
 135         else {
 136                 /* Save the return value */
 137
 138                 walk_state->result_obj = return_desc;
 139         }
 140
 141         return_ACPI_STATUS (status);
 142 }
 143
 144
 145 /*******************************************************************************
 146  *
 147  * FUNCTION:    acpi_ex_opcode_1A_0T_0R
 148  *
 149  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 150  *
 151  * RETURN:      Status
 152  *
 153  * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
 154  *              object stack
 155  *
 156  ******************************************************************************/
 157
 158 acpi_status
 159 acpi_ex_opcode_1A_0T_0R (
 160         struct acpi_walk_state          *walk_state)
 161 {
 162         union acpi_operand_object       **operand = &walk_state->operands[0];
 163         acpi_status                     status = AE_OK;
 164
 165
 166         ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_0T_0R",
 167                 acpi_ps_get_opcode_name (walk_state->opcode));
 168
 169
 170         /* Examine the AML opcode */
 171
 172         switch (walk_state->opcode) {
 173         case AML_RELEASE_OP:    /*  Release (mutex_object) */
 174
 175                 status = acpi_ex_release_mutex (operand[0], walk_state);
 176                 break;
 177
 178
 179         case AML_RESET_OP:      /*  Reset (event_object) */
 180
 181                 status = acpi_ex_system_reset_event (operand[0]);
 182                 break;
 183
 184
 185         case AML_SIGNAL_OP:     /*  Signal (event_object) */
 186
 187                 status = acpi_ex_system_signal_event (operand[0]);
 188                 break;
 189
 190
 191         case AML_SLEEP_OP:      /*  Sleep (msec_time) */
 192
 193                 status = acpi_ex_system_do_suspend (operand[0]->integer.value);
 194                 break;
 195
 196
 197         case AML_STALL_OP:      /*  Stall (usec_time) */
 198
 199                 status = acpi_ex_system_do_stall ((u32) operand[0]->integer.value);
 200                 break;
 201
 202
 203         case AML_UNLOAD_OP:     /*  Unload (Handle) */
 204
 205                 status = acpi_ex_unload_table (operand[0]);
 206                 break;
 207
 208
 209         default:                /*  Unknown opcode  */
 210
 211                 ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_0T_0R: Unknown opcode %X\n",
 212                         walk_state->opcode));
 213                 status = AE_AML_BAD_OPCODE;
 214                 break;
 215         }
 216
 217         return_ACPI_STATUS (status);
 218 }
 219
 220
 221 /*******************************************************************************
 222  *
 223  * FUNCTION:    acpi_ex_opcode_1A_1T_0R
 224  *
 225  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 226  *
 227  * RETURN:      Status
 228  *
 229  * DESCRIPTION: Execute opcode with one argument, one target, and no
 230  *              return value.
 231  *
 232  ******************************************************************************/
 233
 234 acpi_status
 235 acpi_ex_opcode_1A_1T_0R (
 236         struct acpi_walk_state          *walk_state)
 237 {
 238         acpi_status                     status = AE_OK;
 239         union acpi_operand_object       **operand = &walk_state->operands[0];
 240
 241
 242         ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_1T_0R",
 243                 acpi_ps_get_opcode_name (walk_state->opcode));
 244
 245
 246         /* Examine the AML opcode */
 247
 248         switch (walk_state->opcode) {
 249         case AML_LOAD_OP:
 250
 251                 status = acpi_ex_load_op (operand[0], operand[1], walk_state);
 252                 break;
 253
 254         default:                        /* Unknown opcode */
 255
 256                 ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_1T_0R: Unknown opcode %X\n",
 257                         walk_state->opcode));
 258                 status = AE_AML_BAD_OPCODE;
 259                 goto cleanup;
 260         }
 261
 262
 263 cleanup:
 264
 265         return_ACPI_STATUS (status);
 266 }
 267
 268
 269 /*******************************************************************************
 270  *
 271  * FUNCTION:    acpi_ex_opcode_1A_1T_1R
 272  *
 273  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 274  *
 275  * RETURN:      Status
 276  *
 277  * DESCRIPTION: Execute opcode with one argument, one target, and a
 278  *              return value.
 279  *
 280  ******************************************************************************/
 281
 282 acpi_status
 283 acpi_ex_opcode_1A_1T_1R (
 284         struct acpi_walk_state          *walk_state)
 285 {
 286         acpi_status                     status = AE_OK;
 287         union acpi_operand_object       **operand = &walk_state->operands[0];
 288         union acpi_operand_object       *return_desc = NULL;
 289         union acpi_operand_object       *return_desc2 = NULL;
 290         u32                             temp32;
 291         u32                             i;
 292         acpi_integer                    power_of_ten;
 293         acpi_integer                    digit;
 294
 295
 296         ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_1T_1R",
 297                 acpi_ps_get_opcode_name (walk_state->opcode));
 298
 299
 300         /* Examine the AML opcode */
 301
 302         switch (walk_state->opcode) {
 303         case AML_BIT_NOT_OP:
 304         case AML_FIND_SET_LEFT_BIT_OP:
 305         case AML_FIND_SET_RIGHT_BIT_OP:
 306         case AML_FROM_BCD_OP:
 307         case AML_TO_BCD_OP:
 308         case AML_COND_REF_OF_OP:
 309
 310                 /* Create a return object of type Integer for these opcodes */
 311
 312                 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
 313                 if (!return_desc) {
 314                         status = AE_NO_MEMORY;
 315                         goto cleanup;
 316                 }
 317
 318                 switch (walk_state->opcode) {
 319                 case AML_BIT_NOT_OP:            /* Not (Operand, Result)  */
 320
 321                         return_desc->integer.value = ~operand[0]->integer.value;
 322                         break;
 323
 324
 325                 case AML_FIND_SET_LEFT_BIT_OP:  /* find_set_left_bit (Operand, Result) */
 326
 327                         return_desc->integer.value = operand[0]->integer.value;
 328
 329                         /*
 330                          * Acpi specification describes Integer type as a little
 331                          * endian unsigned value, so this boundary condition is valid.
 332                          */
 333                         for (temp32 = 0; return_desc->integer.value &&
 334                                            temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 335                                 return_desc->integer.value >>= 1;
 336                         }
 337
 338                         return_desc->integer.value = temp32;
 339                         break;
 340
 341
 342                 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
 343
 344                         return_desc->integer.value = operand[0]->integer.value;
 345
 346                         /*
 347                          * The Acpi specification describes Integer type as a little
 348                          * endian unsigned value, so this boundary condition is valid.
 349                          */
 350                         for (temp32 = 0; return_desc->integer.value &&
 351                                            temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 352                                 return_desc->integer.value <<= 1;
 353                         }
 354
 355                         /* Since the bit position is one-based, subtract from 33 (65) */
 356
 357                         return_desc->integer.value = temp32 == 0 ? 0 :
 358                                           (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
 359                         break;
 360
 361
 362                 case AML_FROM_BCD_OP:           /* from_bcd (BCDValue, Result) */
 363
 364                         /*
 365                          * The 64-bit ACPI integer can hold 16 4-bit BCD characters
 366                          * (if table is 32-bit, integer can hold 8 BCD characters)
 367                          * Convert each 4-bit BCD value
 368                          */
 369                         power_of_ten = 1;
 370                         return_desc->integer.value = 0;
 371                         digit = operand[0]->integer.value;
 372
 373                         /* Convert each BCD digit (each is one nybble wide) */
 374
 375                         for (i = 0; (i < acpi_gbl_integer_nybble_width) && (digit > 0); i++) {
 376                                 /* Get the least significant 4-bit BCD digit */
 377
 378                                 temp32 = ((u32) digit) & 0xF;
 379
 380                                 /* Check the range of the digit */
 381
 382                                 if (temp32 > 9) {
 383                                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 384                                                 "BCD digit too large (not decimal): 0x%X\n",
 385                                                 temp32));
 386
 387                                         status = AE_AML_NUMERIC_OVERFLOW;
 388                                         goto cleanup;
 389                                 }
 390
 391                                 /* Sum the digit into the result with the current power of 10 */
 392
 393                                 return_desc->integer.value += (((acpi_integer) temp32) *
 394                                                  power_of_ten);
 395
 396                                 /* Shift to next BCD digit */
 397
 398                                 digit >>= 4;
 399
 400                                 /* Next power of 10 */
 401
 402                                 power_of_ten *= 10;
 403                         }
 404                         break;
 405
 406
 407                 case AML_TO_BCD_OP:             /* to_bcd (Operand, Result) */
 408
 409                         return_desc->integer.value = 0;
 410                         digit = operand[0]->integer.value;
 411
 412                         /* Each BCD digit is one nybble wide */
 413
 414                         for (i = 0; (i < acpi_gbl_integer_nybble_width) && (digit > 0); i++) {
 415                                 (void) acpi_ut_short_divide (digit, 10, &digit, &temp32);
 416
 417                                 /*
 418                                  * Insert the BCD digit that resides in the
 419                                  * remainder from above
 420                                  */
 421                                 return_desc->integer.value |= (((acpi_integer) temp32) <<
 422                                                    ACPI_MUL_4 (i));
 423                         }
 424
 425                         /* Overflow if there is any data left in Digit */
 426
 427                         if (digit > 0) {
 428                                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 429                                         "Integer too large to convert to BCD: %8.8X%8.8X\n",
 430                                         ACPI_FORMAT_UINT64 (operand[0]->integer.value)));
 431                                 status = AE_AML_NUMERIC_OVERFLOW;
 432                                 goto cleanup;
 433                         }
 434                         break;
 435
 436
 437                 case AML_COND_REF_OF_OP:        /* cond_ref_of (source_object, Result) */
 438
 439                         /*
 440                          * This op is a little strange because the internal return value is
 441                          * different than the return value stored in the result descriptor
 442                          * (There are really two return values)
 443                          */
 444                         if ((struct acpi_namespace_node *) operand[0] == acpi_gbl_root_node) {
 445                                 /*
 446                                  * This means that the object does not exist in the namespace,
 447                                  * return FALSE
 448                                  */
 449                                 return_desc->integer.value = 0;
 450                                 goto cleanup;
 451                         }
 452
 453                         /* Get the object reference, store it, and remove our reference */
 454
 455                         status = acpi_ex_get_object_reference (operand[0],
 456                                          &return_desc2, walk_state);
 457                         if (ACPI_FAILURE (status)) {
 458                                 goto cleanup;
 459                         }
 460
 461                         status = acpi_ex_store (return_desc2, operand[1], walk_state);
 462                         acpi_ut_remove_reference (return_desc2);
 463
 464                         /* The object exists in the namespace, return TRUE */
 465
 466                         return_desc->integer.value = ACPI_INTEGER_MAX;
 467                         goto cleanup;
 468
 469
 470                 default:
 471                         /* No other opcodes get here */
 472                         break;
 473                 }
 474                 break;
 475
 476
 477         case AML_STORE_OP:              /* Store (Source, Target) */
 478
 479                 /*
 480                  * A store operand is typically a number, string, buffer or lvalue
 481                  * Be careful about deleting the source object,
 482                  * since the object itself may have been stored.
 483                  */
 484                 status = acpi_ex_store (operand[0], operand[1], walk_state);
 485                 if (ACPI_FAILURE (status)) {
 486                         return_ACPI_STATUS (status);
 487                 }
 488
 489                 /* It is possible that the Store already produced a return object */
 490
 491                 if (!walk_state->result_obj) {
 492                         /*
 493                          * Normally, we would remove a reference on the Operand[0]
 494                          * parameter; But since it is being used as the internal return
 495                          * object (meaning we would normally increment it), the two
 496                          * cancel out, and we simply don't do anything.
 497                          */
 498                         walk_state->result_obj = operand[0];
 499                         walk_state->operands[0] = NULL; /* Prevent deletion */
 500                 }
 501                 return_ACPI_STATUS (status);
 502
 503
 504         /*
 505          * ACPI 2.0 Opcodes
 506          */
 507         case AML_COPY_OP:               /* Copy (Source, Target) */
 508
 509                 status = acpi_ut_copy_iobject_to_iobject (operand[0], &return_desc,
 510                                  walk_state);
 511                 break;
 512
 513
 514         case AML_TO_DECSTRING_OP:       /* to_decimal_string (Data, Result) */
 515
 516                 status = acpi_ex_convert_to_string (operand[0], &return_desc,
 517                                  ACPI_EXPLICIT_CONVERT_DECIMAL);
 518                 if (return_desc == operand[0]) {
 519                         /* No conversion performed, add ref to handle return value */
 520                         acpi_ut_add_reference (return_desc);
 521                 }
 522                 break;
 523
 524
 525         case AML_TO_HEXSTRING_OP:       /* to_hex_string (Data, Result) */
 526
 527                 status = acpi_ex_convert_to_string (operand[0], &return_desc,
 528                                  ACPI_EXPLICIT_CONVERT_HEX);
 529                 if (return_desc == operand[0]) {
 530                         /* No conversion performed, add ref to handle return value */
 531                         acpi_ut_add_reference (return_desc);
 532                 }
 533                 break;
 534
 535
 536         case AML_TO_BUFFER_OP:          /* to_buffer (Data, Result) */
 537
 538                 status = acpi_ex_convert_to_buffer (operand[0], &return_desc);
 539                 if (return_desc == operand[0]) {
 540                         /* No conversion performed, add ref to handle return value */
 541                         acpi_ut_add_reference (return_desc);
 542                 }
 543                 break;
 544
 545
 546         case AML_TO_INTEGER_OP:         /* to_integer (Data, Result) */
 547
 548                 status = acpi_ex_convert_to_integer (operand[0], &return_desc,
 549                                  ACPI_ANY_BASE);
 550                 if (return_desc == operand[0]) {
 551                         /* No conversion performed, add ref to handle return value */
 552                         acpi_ut_add_reference (return_desc);
 553                 }
 554                 break;
 555
 556
 557         case AML_SHIFT_LEFT_BIT_OP:     /* shift_left_bit (Source, bit_num) */
 558         case AML_SHIFT_RIGHT_BIT_OP:    /* shift_right_bit (Source, bit_num) */
 559
 560                 /* These are two obsolete opcodes */
 561
 562                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 563                         "%s is obsolete and not implemented\n",
 564                         acpi_ps_get_opcode_name (walk_state->opcode)));
 565                 status = AE_SUPPORT;
 566                 goto cleanup;
 567
 568
 569         default:                        /* Unknown opcode */
 570
 571                 ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_1T_1R: Unknown opcode %X\n",
 572                         walk_state->opcode));
 573                 status = AE_AML_BAD_OPCODE;
 574                 goto cleanup;
 575         }
 576
 577         if (ACPI_SUCCESS (status)) {
 578                 /* Store the return value computed above into the target object */
 579
 580                 status = acpi_ex_store (return_desc, operand[1], walk_state);
 581         }
 582
 583
 584 cleanup:
 585
 586         if (!walk_state->result_obj) {
 587                 walk_state->result_obj = return_desc;
 588         }
 589
 590         /* Delete return object on error */
 591
 592         if (ACPI_FAILURE (status)) {
 593                 acpi_ut_remove_reference (return_desc);
 594         }
 595
 596         return_ACPI_STATUS (status);
 597 }
 598
 599
 600 /*******************************************************************************
 601  *
 602  * FUNCTION:    acpi_ex_opcode_1A_0T_1R
 603  *
 604  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 605  *
 606  * RETURN:      Status
 607  *
 608  * DESCRIPTION: Execute opcode with one argument, no target, and a return value
 609  *
 610  ******************************************************************************/
 611
 612 acpi_status
 613 acpi_ex_opcode_1A_0T_1R (
 614         struct acpi_walk_state          *walk_state)
 615 {
 616         union acpi_operand_object       **operand = &walk_state->operands[0];
 617         union acpi_operand_object       *temp_desc;
 618         union acpi_operand_object       *return_desc = NULL;
 619         acpi_status                     status = AE_OK;
 620         u32                             type;
 621         acpi_integer                    value;
 622
 623
 624         ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_0T_1R",
 625                 acpi_ps_get_opcode_name (walk_state->opcode));
 626
 627
 628         /* Examine the AML opcode */
 629
 630         switch (walk_state->opcode) {
 631         case AML_LNOT_OP:               /* LNot (Operand) */
 632
 633                 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
 634                 if (!return_desc) {
 635                         status = AE_NO_MEMORY;
 636                         goto cleanup;
 637                 }
 638
 639                 /*
 640                  * Set result to ONES (TRUE) if Value == 0.  Note:
 641                  * return_desc->Integer.Value is initially == 0 (FALSE) from above.
 642                  */
 643                 if (!operand[0]->integer.value) {
 644                         return_desc->integer.value = ACPI_INTEGER_MAX;
 645                 }
 646                 break;
 647
 648
 649         case AML_DECREMENT_OP:          /* Decrement (Operand)  */
 650         case AML_INCREMENT_OP:          /* Increment (Operand)  */
 651
 652                 /*
 653                  * Create a new integer.  Can't just get the base integer and
 654                  * increment it because it may be an Arg or Field.
 655                  */
 656                 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
 657                 if (!return_desc) {
 658                         status = AE_NO_MEMORY;
 659                         goto cleanup;
 660                 }
 661
 662                 /*
 663                  * Since we are expecting a Reference operand, it can be either a
 664                  * NS Node or an internal object.
 665                  */
 666                 temp_desc = operand[0];
 667                 if (ACPI_GET_DESCRIPTOR_TYPE (temp_desc) == ACPI_DESC_TYPE_OPERAND) {
 668                         /* Internal reference object - prevent deletion */
 669
 670                         acpi_ut_add_reference (temp_desc);
 671                 }
 672
 673                 /*
 674                  * Convert the Reference operand to an Integer (This removes a
 675                  * reference on the Operand[0] object)
 676                  *
 677                  * NOTE:  We use LNOT_OP here in order to force resolution of the
 678                  * reference operand to an actual integer.
 679                  */
 680                 status = acpi_ex_resolve_operands (AML_LNOT_OP, &temp_desc, walk_state);
 681                 if (ACPI_FAILURE (status)) {
 682                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%s: bad operand(s) %s\n",
 683                                 acpi_ps_get_opcode_name (walk_state->opcode),
 684                                 acpi_format_exception(status)));
 685
 686                         goto cleanup;
 687                 }
 688
 689                 /*
 690                  * temp_desc is now guaranteed to be an Integer object --
 691                  * Perform the actual increment or decrement
 692                  */
 693                 if (walk_state->opcode == AML_INCREMENT_OP) {
 694                         return_desc->integer.value = temp_desc->integer.value +1;
 695                 }
 696                 else {
 697                         return_desc->integer.value = temp_desc->integer.value -1;
 698                 }
 699
 700                 /* Finished with this Integer object */
 701
 702                 acpi_ut_remove_reference (temp_desc);
 703
 704                 /*
 705                  * Store the result back (indirectly) through the original
 706                  * Reference object
 707                  */
 708                 status = acpi_ex_store (return_desc, operand[0], walk_state);
 709                 break;
 710
 711
 712         case AML_TYPE_OP:               /* object_type (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.  For example, we don't
 717                  * want to resolve a field_unit to its value, we want the actual
 718                  * field_unit object.
 719                  */
 720
 721                 /* Get the type of the base object */
 722
 723                 status = acpi_ex_resolve_multiple (walk_state, operand[0], &type, NULL);
 724                 if (ACPI_FAILURE (status)) {
 725                         goto cleanup;
 726                 }
 727                 /* Allocate a descriptor to hold the type. */
 728
 729                 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
 730                 if (!return_desc) {
 731                         status = AE_NO_MEMORY;
 732                         goto cleanup;
 733                 }
 734
 735                 return_desc->integer.value = type;
 736                 break;
 737
 738
 739         case AML_SIZE_OF_OP:            /* size_of (source_object) */
 740
 741                 /*
 742                  * Note: The operand is not resolved at this point because we want to
 743                  * get the associated object, not its value.
 744                  */
 745
 746                 /* Get the base object */
 747
 748                 status = acpi_ex_resolve_multiple (walk_state,
 749                                  operand[0], &type, &temp_desc);
 750                 if (ACPI_FAILURE (status)) {
 751                         goto cleanup;
 752                 }
 753
 754                 /*
 755                  * The type of the base object must be integer, buffer, string, or
 756                  * package.  All others are not supported.
 757                  *
 758                  * NOTE: Integer is not specifically supported by the ACPI spec,
 759                  * but is supported implicitly via implicit operand conversion.
 760                  * rather than bother with conversion, we just use the byte width
 761                  * global (4 or 8 bytes).
 762                  */
 763                 switch (type) {
 764                 case ACPI_TYPE_INTEGER:
 765                         value = acpi_gbl_integer_byte_width;
 766                         break;
 767
 768                 case ACPI_TYPE_BUFFER:
 769                         value = temp_desc->buffer.length;
 770                         break;
 771
 772                 case ACPI_TYPE_STRING:
 773                         value = temp_desc->string.length;
 774                         break;
 775
 776                 case ACPI_TYPE_PACKAGE:
 777                         value = temp_desc->package.count;
 778                         break;
 779
 780                 default:
 781                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 782                                 "size_of - Operand is not Buf/Int/Str/Pkg - found type %s\n",
 783                                 acpi_ut_get_type_name (type)));
 784                         status = AE_AML_OPERAND_TYPE;
 785                         goto cleanup;
 786                 }
 787
 788                 /*
 789                  * Now that we have the size of the object, create a result
 790                  * object to hold the value
 791                  */
 792                 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
 793                 if (!return_desc) {
 794                         status = AE_NO_MEMORY;
 795                         goto cleanup;
 796                 }
 797
 798                 return_desc->integer.value = value;
 799                 break;
 800
 801
 802         case AML_REF_OF_OP:             /* ref_of (source_object) */
 803
 804                 status = acpi_ex_get_object_reference (operand[0], &return_desc, walk_state);
 805                 if (ACPI_FAILURE (status)) {
 806                         goto cleanup;
 807                 }
 808                 break;
 809
 810
 811         case AML_DEREF_OF_OP:           /* deref_of (obj_reference | String) */
 812
 813                 /* Check for a method local or argument, or standalone String */
 814
 815                 if (ACPI_GET_DESCRIPTOR_TYPE (operand[0]) != ACPI_DESC_TYPE_NAMED) {
 816                         switch (ACPI_GET_OBJECT_TYPE (operand[0])) {
 817                         case ACPI_TYPE_LOCAL_REFERENCE:
 818                                 /*
 819                                  * This is a deref_of (local_x | arg_x)
 820                                  *
 821                                  * Must resolve/dereference the local/arg reference first
 822                                  */
 823                                 switch (operand[0]->reference.opcode) {
 824                                 case AML_LOCAL_OP:
 825                                 case AML_ARG_OP:
 826
 827                                         /* Set Operand[0] to the value of the local/arg */
 828
 829                                         status = acpi_ds_method_data_get_value (
 830                                                          operand[0]->reference.opcode,
 831                                                          operand[0]->reference.offset,
 832                                                          walk_state, &temp_desc);
 833                                         if (ACPI_FAILURE (status)) {
 834                                                 goto cleanup;
 835                                         }
 836
 837                                         /*
 838                                          * Delete our reference to the input object and
 839                                          * point to the object just retrieved
 840                                          */
 841                                         acpi_ut_remove_reference (operand[0]);
 842                                         operand[0] = temp_desc;
 843                                         break;
 844
 845                                 case AML_REF_OF_OP:
 846
 847                                         /* Get the object to which the reference refers */
 848
 849                                         temp_desc = operand[0]->reference.object;
 850                                         acpi_ut_remove_reference (operand[0]);
 851                                         operand[0] = temp_desc;
 852                                         break;
 853
 854                                 default:
 855
 856                                         /* Must be an Index op - handled below */
 857                                         break;
 858                                 }
 859                                 break;
 860
 861
 862                         case ACPI_TYPE_STRING:
 863
 864                                 /*
 865                                  * This is a deref_of (String). The string is a reference
 866                                  * to a named ACPI object.
 867                                  *
 868                                  * 1) Find the owning Node
 869                                  * 2) Dereference the node to an actual object.  Could be a
 870                                  *    Field, so we need to resolve the node to a value.
 871                                  */
 872                                 status = acpi_ns_get_node_by_path (operand[0]->string.pointer,
 873                                                  walk_state->scope_info->scope.node,
 874                                                  ACPI_NS_SEARCH_PARENT,
 875                                                  ACPI_CAST_INDIRECT_PTR (
 876                                                                 struct acpi_namespace_node, &return_desc));
 877                                 if (ACPI_FAILURE (status)) {
 878                                         goto cleanup;
 879                                 }
 880
 881                                 status = acpi_ex_resolve_node_to_value (
 882                                                   ACPI_CAST_INDIRECT_PTR (
 883                                                                  struct acpi_namespace_node, &return_desc),
 884                                                                 walk_state);
 885                                 goto cleanup;
 886
 887
 888                         default:
 889
 890                                 status = AE_AML_OPERAND_TYPE;
 891                                 goto cleanup;
 892                         }
 893                 }
 894
 895                 /* Operand[0] may have changed from the code above */
 896
 897                 if (ACPI_GET_DESCRIPTOR_TYPE (operand[0]) == ACPI_DESC_TYPE_NAMED) {
 898                         /*
 899                          * This is a deref_of (object_reference)
 900                          * Get the actual object from the Node (This is the dereference).
 901                          * This case may only happen when a local_x or arg_x is
 902                          * dereferenced above.
 903                          */
 904                         return_desc = acpi_ns_get_attached_object (
 905                                           (struct acpi_namespace_node *) operand[0]);
 906                 }
 907                 else {
 908                         /*
 909                          * This must be a reference object produced by either the
 910                          * Index() or ref_of() operator
 911                          */
 912                         switch (operand[0]->reference.opcode) {
 913                         case AML_INDEX_OP:
 914
 915                                 /*
 916                                  * The target type for the Index operator must be
 917                                  * either a Buffer or a Package
 918                                  */
 919                                 switch (operand[0]->reference.target_type) {
 920                                 case ACPI_TYPE_BUFFER_FIELD:
 921
 922                                         temp_desc = operand[0]->reference.object;
 923
 924                                         /*
 925                                          * Create a new object that contains one element of the
 926                                          * buffer -- the element pointed to by the index.
 927                                          *
 928                                          * NOTE: index into a buffer is NOT a pointer to a
 929                                          * sub-buffer of the main buffer, it is only a pointer to a
 930                                          * single element (byte) of the buffer!
 931                                          */
 932                                         return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
 933                                         if (!return_desc) {
 934                                                 status = AE_NO_MEMORY;
 935                                                 goto cleanup;
 936                                         }
 937
 938                                         /*
 939                                          * Since we are returning the value of the buffer at the
 940                                          * indexed location, we don't need to add an additional
 941                                          * reference to the buffer itself.
 942                                          */
 943                                         return_desc->integer.value =
 944                                                 temp_desc->buffer.pointer[operand[0]->reference.offset];
 945                                         break;
 946
 947
 948                                 case ACPI_TYPE_PACKAGE:
 949
 950                                         /*
 951                                          * Return the referenced element of the package.  We must
 952                                          * add another reference to the referenced object, however.
 953                                          */
 954                                         return_desc = *(operand[0]->reference.where);
 955                                         if (!return_desc) {
 956                                                 /*
 957                                                  * We can't return a NULL dereferenced value.  This is
 958                                                  * an uninitialized package element and is thus a
 959                                                  * severe error.
 960                                                  */
 961                                                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 962                                                         "NULL package element obj %p\n",
 963                                                         operand[0]));
 964                                                 status = AE_AML_UNINITIALIZED_ELEMENT;
 965                                                 goto cleanup;
 966                                         }
 967
 968                                         acpi_ut_add_reference (return_desc);
 969                                         break;
 970
 971
 972                                 default:
 973
 974                                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 975                                                 "Unknown Index target_type %X in obj %p\n",
 976                                                 operand[0]->reference.target_type, operand[0]));
 977                                         status = AE_AML_OPERAND_TYPE;
 978                                         goto cleanup;
 979                                 }
 980                                 break;
 981
 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
 990                                         return_desc = acpi_ns_get_attached_object (
 991                                                           (struct acpi_namespace_node *) return_desc);
 992                                 }
 993
 994                                 /* Add another reference to the object! */
 995
 996                                 acpi_ut_add_reference (return_desc);
 997                                 break;
 998
 999
1000                         default:
1001                                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
1002                                         "Unknown opcode in ref(%p) - %X\n",
1003                                         operand[0], operand[0]->reference.opcode));
1004
1005                                 status = AE_TYPE;
1006                                 goto cleanup;
1007                         }
1008                 }
1009                 break;
1010
1011
1012         default:
1013
1014                 ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_0T_1R: Unknown opcode %X\n",
1015                         walk_state->opcode));
1016                 status = AE_AML_BAD_OPCODE;
1017                 goto cleanup;
1018         }
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         walk_state->result_obj = return_desc;
1030         return_ACPI_STATUS (status);
1031 }
1032