drivers/acpi/executer/exmisc.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
   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/acinterp.h>
  48 #include <acpi/amlcode.h>
  49
  50
  51 #define _COMPONENT          ACPI_EXECUTER
  52          ACPI_MODULE_NAME    ("exmisc")
  53
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ex_get_object_reference
  58  *
  59  * PARAMETERS:  obj_desc            - Create a reference to this object
  60  *              return_desc         - Where to store the reference
  61  *              walk_state          - Current state
  62  *
  63  * RETURN:      Status
  64  *
  65  * DESCRIPTION: Obtain and return a "reference" to the target object
  66  *              Common code for the ref_of_op and the cond_ref_of_op.
  67  *
  68  ******************************************************************************/
  69
  70 acpi_status
  71 acpi_ex_get_object_reference (
  72         union acpi_operand_object       *obj_desc,
  73         union acpi_operand_object       **return_desc,
  74         struct acpi_walk_state          *walk_state)
  75 {
  76         union acpi_operand_object       *reference_obj;
  77         union acpi_operand_object       *referenced_obj;
  78
  79
  80         ACPI_FUNCTION_TRACE_PTR ("ex_get_object_reference", obj_desc);
  81
  82
  83         *return_desc = NULL;
  84
  85         switch (ACPI_GET_DESCRIPTOR_TYPE (obj_desc)) {
  86         case ACPI_DESC_TYPE_OPERAND:
  87
  88                 if (ACPI_GET_OBJECT_TYPE (obj_desc) != ACPI_TYPE_LOCAL_REFERENCE) {
  89                         return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
  90                 }
  91
  92                 /*
  93                  * Must be a reference to a Local or Arg
  94                  */
  95                 switch (obj_desc->reference.opcode) {
  96                 case AML_LOCAL_OP:
  97                 case AML_ARG_OP:
  98                 case AML_DEBUG_OP:
  99
 100                         /* The referenced object is the pseudo-node for the local/arg */
 101
 102                         referenced_obj = obj_desc->reference.object;
 103                         break;
 104
 105                 default:
 106
 107                         ACPI_REPORT_ERROR (("Unknown Reference opcode in get_reference %X\n",
 108                                 obj_desc->reference.opcode));
 109                         return_ACPI_STATUS (AE_AML_INTERNAL);
 110                 }
 111                 break;
 112
 113
 114         case ACPI_DESC_TYPE_NAMED:
 115
 116                 /*
 117                  * A named reference that has already been resolved to a Node
 118                  */
 119                 referenced_obj = obj_desc;
 120                 break;
 121
 122
 123         default:
 124
 125                 ACPI_REPORT_ERROR (("Invalid descriptor type in get_reference: %X\n",
 126                                 ACPI_GET_DESCRIPTOR_TYPE (obj_desc)));
 127                 return_ACPI_STATUS (AE_TYPE);
 128         }
 129
 130
 131         /* Create a new reference object */
 132
 133         reference_obj = acpi_ut_create_internal_object (ACPI_TYPE_LOCAL_REFERENCE);
 134         if (!reference_obj) {
 135                 return_ACPI_STATUS (AE_NO_MEMORY);
 136         }
 137
 138         reference_obj->reference.opcode = AML_REF_OF_OP;
 139         reference_obj->reference.object = referenced_obj;
 140         *return_desc = reference_obj;
 141
 142         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 143                 "Object %p Type [%s], returning Reference %p\n",
 144                 obj_desc, acpi_ut_get_object_type_name (obj_desc), *return_desc));
 145
 146         return_ACPI_STATUS (AE_OK);
 147 }
 148
 149
 150 /*******************************************************************************
 151  *
 152  * FUNCTION:    acpi_ex_concat_template
 153  *
 154  * PARAMETERS:  Operand0            - First source object
 155  *              Operand1            - Second source object
 156  *              actual_return_desc  - Where to place the return object
 157  *              walk_state          - Current walk state
 158  *
 159  * RETURN:      Status
 160  *
 161  * DESCRIPTION: Concatenate two resource templates
 162  *
 163  ******************************************************************************/
 164
 165 acpi_status
 166 acpi_ex_concat_template (
 167         union acpi_operand_object       *operand0,
 168         union acpi_operand_object       *operand1,
 169         union acpi_operand_object       **actual_return_desc,
 170         struct acpi_walk_state          *walk_state)
 171 {
 172         union acpi_operand_object       *return_desc;
 173         u8                              *new_buf;
 174         u8                              *end_tag1;
 175         u8                              *end_tag2;
 176         acpi_size                       length1;
 177         acpi_size                       length2;
 178
 179
 180         ACPI_FUNCTION_TRACE ("ex_concat_template");
 181
 182
 183         /* Find the end_tags in each resource template */
 184
 185         end_tag1 = acpi_ut_get_resource_end_tag (operand0);
 186         end_tag2 = acpi_ut_get_resource_end_tag (operand1);
 187         if (!end_tag1 || !end_tag2) {
 188                 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 189         }
 190
 191         /* Compute the length of each part */
 192
 193         length1 = ACPI_PTR_DIFF (end_tag1, operand0->buffer.pointer);
 194         length2 = ACPI_PTR_DIFF (end_tag2, operand1->buffer.pointer) +
 195                           2; /* Size of END_TAG */
 196
 197         /* Create a new buffer object for the result */
 198
 199         return_desc = acpi_ut_create_buffer_object (length1 + length2);
 200         if (!return_desc) {
 201                 return_ACPI_STATUS (AE_NO_MEMORY);
 202         }
 203
 204         /* Copy the templates to the new descriptor */
 205
 206         new_buf = return_desc->buffer.pointer;
 207         ACPI_MEMCPY (new_buf, operand0->buffer.pointer, length1);
 208         ACPI_MEMCPY (new_buf + length1, operand1->buffer.pointer, length2);
 209
 210         /* Compute the new checksum */
 211
 212         new_buf[return_desc->buffer.length - 1] =
 213                         acpi_ut_generate_checksum (return_desc->buffer.pointer,
 214                                            (return_desc->buffer.length - 1));
 215
 216         /* Return the completed template descriptor */
 217
 218         *actual_return_desc = return_desc;
 219         return_ACPI_STATUS (AE_OK);
 220 }
 221
 222
 223 /*******************************************************************************
 224  *
 225  * FUNCTION:    acpi_ex_do_concatenate
 226  *
 227  * PARAMETERS:  Operand0            - First source object
 228  *              Operand1            - Second source object
 229  *              actual_return_desc  - Where to place the return object
 230  *              walk_state          - Current walk state
 231  *
 232  * RETURN:      Status
 233  *
 234  * DESCRIPTION: Concatenate two objects OF THE SAME TYPE.
 235  *
 236  ******************************************************************************/
 237
 238 acpi_status
 239 acpi_ex_do_concatenate (
 240         union acpi_operand_object       *operand0,
 241         union acpi_operand_object       *operand1,
 242         union acpi_operand_object       **actual_return_desc,
 243         struct acpi_walk_state          *walk_state)
 244 {
 245         union acpi_operand_object       *local_operand1 = operand1;
 246         union acpi_operand_object       *return_desc;
 247         char                            *new_buf;
 248         acpi_status                     status;
 249         acpi_size                       new_length;
 250
 251
 252         ACPI_FUNCTION_TRACE ("ex_do_concatenate");
 253
 254
 255         /*
 256          * Convert the second operand if necessary.  The first operand
 257          * determines the type of the second operand, (See the Data Types
 258          * section of the ACPI specification.)  Both object types are
 259          * guaranteed to be either Integer/String/Buffer by the operand
 260          * resolution mechanism.
 261          */
 262         switch (ACPI_GET_OBJECT_TYPE (operand0)) {
 263         case ACPI_TYPE_INTEGER:
 264                 status = acpi_ex_convert_to_integer (operand1, &local_operand1, 16);
 265                 break;
 266
 267         case ACPI_TYPE_STRING:
 268                 status = acpi_ex_convert_to_string (operand1, &local_operand1,
 269                                  ACPI_IMPLICIT_CONVERT_HEX);
 270                 break;
 271
 272         case ACPI_TYPE_BUFFER:
 273                 status = acpi_ex_convert_to_buffer (operand1, &local_operand1);
 274                 break;
 275
 276         default:
 277                 ACPI_REPORT_ERROR (("Concat - invalid obj type: %X\n",
 278                                 ACPI_GET_OBJECT_TYPE (operand0)));
 279                 status = AE_AML_INTERNAL;
 280         }
 281
 282         if (ACPI_FAILURE (status)) {
 283                 goto cleanup;
 284         }
 285
 286         /*
 287          * Both operands are now known to be the same object type
 288          * (Both are Integer, String, or Buffer), and we can now perform the
 289          * concatenation.
 290          */
 291
 292         /*
 293          * There are three cases to handle:
 294          *
 295          * 1) Two Integers concatenated to produce a new Buffer
 296          * 2) Two Strings concatenated to produce a new String
 297          * 3) Two Buffers concatenated to produce a new Buffer
 298          */
 299         switch (ACPI_GET_OBJECT_TYPE (operand0)) {
 300         case ACPI_TYPE_INTEGER:
 301
 302                 /* Result of two Integers is a Buffer */
 303                 /* Need enough buffer space for two integers */
 304
 305                 return_desc = acpi_ut_create_buffer_object (
 306                                    ACPI_MUL_2 (acpi_gbl_integer_byte_width));
 307                 if (!return_desc) {
 308                         status = AE_NO_MEMORY;
 309                         goto cleanup;
 310                 }
 311
 312                 new_buf = (char *) return_desc->buffer.pointer;
 313
 314                 /* Copy the first integer, LSB first */
 315
 316                 ACPI_MEMCPY (new_buf,
 317                                   &operand0->integer.value,
 318                                   acpi_gbl_integer_byte_width);
 319
 320                 /* Copy the second integer (LSB first) after the first */
 321
 322                 ACPI_MEMCPY (new_buf + acpi_gbl_integer_byte_width,
 323                                   &local_operand1->integer.value,
 324                                   acpi_gbl_integer_byte_width);
 325                 break;
 326
 327         case ACPI_TYPE_STRING:
 328
 329                 /* Result of two Strings is a String */
 330
 331                 new_length = (acpi_size) operand0->string.length +
 332                                  (acpi_size) local_operand1->string.length;
 333                 if (new_length > ACPI_MAX_STRING_CONVERSION) {
 334                         status = AE_AML_STRING_LIMIT;
 335                         goto cleanup;
 336                 }
 337
 338                 return_desc = acpi_ut_create_string_object (new_length);
 339                 if (!return_desc) {
 340                         status = AE_NO_MEMORY;
 341                         goto cleanup;
 342                 }
 343
 344                 new_buf = return_desc->string.pointer;
 345
 346                 /* Concatenate the strings */
 347
 348                 ACPI_STRCPY (new_buf,
 349                                   operand0->string.pointer);
 350                 ACPI_STRCPY (new_buf + operand0->string.length,
 351                                   local_operand1->string.pointer);
 352                 break;
 353
 354         case ACPI_TYPE_BUFFER:
 355
 356                 /* Result of two Buffers is a Buffer */
 357
 358                 return_desc = acpi_ut_create_buffer_object (
 359                                    (acpi_size) operand0->buffer.length +
 360                                    (acpi_size) local_operand1->buffer.length);
 361                 if (!return_desc) {
 362                         status = AE_NO_MEMORY;
 363                         goto cleanup;
 364                 }
 365
 366                 new_buf = (char *) return_desc->buffer.pointer;
 367
 368                 /* Concatenate the buffers */
 369
 370                 ACPI_MEMCPY (new_buf,
 371                                   operand0->buffer.pointer,
 372                                   operand0->buffer.length);
 373                 ACPI_MEMCPY (new_buf + operand0->buffer.length,
 374                                   local_operand1->buffer.pointer,
 375                                   local_operand1->buffer.length);
 376                 break;
 377
 378         default:
 379
 380                 /* Invalid object type, should not happen here */
 381
 382                 ACPI_REPORT_ERROR (("Concatenate - Invalid object type: %X\n",
 383                                 ACPI_GET_OBJECT_TYPE (operand0)));
 384                 status =AE_AML_INTERNAL;
 385                 goto cleanup;
 386         }
 387
 388         *actual_return_desc = return_desc;
 389
 390 cleanup:
 391         if (local_operand1 != operand1) {
 392                 acpi_ut_remove_reference (local_operand1);
 393         }
 394         return_ACPI_STATUS (status);
 395 }
 396
 397
 398 /*******************************************************************************
 399  *
 400  * FUNCTION:    acpi_ex_do_math_op
 401  *
 402  * PARAMETERS:  Opcode              - AML opcode
 403  *              Integer0            - Integer operand #0
 404  *              Integer1            - Integer operand #1
 405  *
 406  * RETURN:      Integer result of the operation
 407  *
 408  * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
 409  *              math functions here is to prevent a lot of pointer dereferencing
 410  *              to obtain the operands.
 411  *
 412  ******************************************************************************/
 413
 414 acpi_integer
 415 acpi_ex_do_math_op (
 416         u16                             opcode,
 417         acpi_integer                    integer0,
 418         acpi_integer                    integer1)
 419 {
 420
 421         ACPI_FUNCTION_ENTRY ();
 422
 423
 424         switch (opcode) {
 425         case AML_ADD_OP:                /* Add (Integer0, Integer1, Result) */
 426
 427                 return (integer0 + integer1);
 428
 429
 430         case AML_BIT_AND_OP:            /* And (Integer0, Integer1, Result) */
 431
 432                 return (integer0 & integer1);
 433
 434
 435         case AML_BIT_NAND_OP:           /* NAnd (Integer0, Integer1, Result) */
 436
 437                 return (~(integer0 & integer1));
 438
 439
 440         case AML_BIT_OR_OP:             /* Or (Integer0, Integer1, Result) */
 441
 442                 return (integer0 | integer1);
 443
 444
 445         case AML_BIT_NOR_OP:            /* NOr (Integer0, Integer1, Result) */
 446
 447                 return (~(integer0 | integer1));
 448
 449
 450         case AML_BIT_XOR_OP:            /* XOr (Integer0, Integer1, Result) */
 451
 452                 return (integer0 ^ integer1);
 453
 454
 455         case AML_MULTIPLY_OP:           /* Multiply (Integer0, Integer1, Result) */
 456
 457                 return (integer0 * integer1);
 458
 459
 460         case AML_SHIFT_LEFT_OP:         /* shift_left (Operand, shift_count, Result)*/
 461
 462                 return (integer0 << integer1);
 463
 464
 465         case AML_SHIFT_RIGHT_OP:        /* shift_right (Operand, shift_count, Result) */
 466
 467                 return (integer0 >> integer1);
 468
 469
 470         case AML_SUBTRACT_OP:           /* Subtract (Integer0, Integer1, Result) */
 471
 472                 return (integer0 - integer1);
 473
 474         default:
 475
 476                 return (0);
 477         }
 478 }
 479
 480
 481 /*******************************************************************************
 482  *
 483  * FUNCTION:    acpi_ex_do_logical_numeric_op
 484  *
 485  * PARAMETERS:  Opcode              - AML opcode
 486  *              Integer0            - Integer operand #0
 487  *              Integer1            - Integer operand #1
 488  *              logical_result      - TRUE/FALSE result of the operation
 489  *
 490  * RETURN:      Status
 491  *
 492  * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric
 493  *              operators (LAnd and LOr), both operands must be integers.
 494  *
 495  *              Note: cleanest machine code seems to be produced by the code
 496  *              below, rather than using statements of the form:
 497  *                  Result = (Integer0 && Integer1);
 498  *
 499  ******************************************************************************/
 500
 501 acpi_status
 502 acpi_ex_do_logical_numeric_op (
 503         u16                             opcode,
 504         acpi_integer                    integer0,
 505         acpi_integer                    integer1,
 506         u8                              *logical_result)
 507 {
 508         acpi_status                     status = AE_OK;
 509         u8                              local_result = FALSE;
 510
 511
 512         ACPI_FUNCTION_TRACE ("ex_do_logical_numeric_op");
 513
 514
 515         switch (opcode) {
 516         case AML_LAND_OP:               /* LAnd (Integer0, Integer1) */
 517
 518                 if (integer0 && integer1) {
 519                         local_result = TRUE;
 520                 }
 521                 break;
 522
 523         case AML_LOR_OP:                /* LOr (Integer0, Integer1) */
 524
 525                 if (integer0 || integer1) {
 526                         local_result = TRUE;
 527                 }
 528                 break;
 529
 530         default:
 531                 status = AE_AML_INTERNAL;
 532                 break;
 533         }
 534
 535         /* Return the logical result and status */
 536
 537         *logical_result = local_result;
 538         return_ACPI_STATUS (status);
 539 }
 540
 541
 542 /*******************************************************************************
 543  *
 544  * FUNCTION:    acpi_ex_do_logical_op
 545  *
 546  * PARAMETERS:  Opcode              - AML opcode
 547  *              Operand0            - operand #0
 548  *              Operand1            - operand #1
 549  *              logical_result      - TRUE/FALSE result of the operation
 550  *
 551  * RETURN:      Status
 552  *
 553  * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
 554  *              functions here is to prevent a lot of pointer dereferencing
 555  *              to obtain the operands and to simplify the generation of the
 556  *              logical value. For the Numeric operators (LAnd and LOr), both
 557  *              operands must be integers. For the other logical operators,
 558  *              operands can be any combination of Integer/String/Buffer. The
 559  *              first operand determines the type to which the second operand
 560  *              will be converted.
 561  *
 562  *              Note: cleanest machine code seems to be produced by the code
 563  *              below, rather than using statements of the form:
 564  *                  Result = (Operand0 == Operand1);
 565  *
 566  ******************************************************************************/
 567
 568 acpi_status
 569 acpi_ex_do_logical_op (
 570         u16                             opcode,
 571         union acpi_operand_object       *operand0,
 572         union acpi_operand_object       *operand1,
 573         u8                              *logical_result)
 574 {
 575         union acpi_operand_object       *local_operand1 = operand1;
 576         acpi_integer                    integer0;
 577         acpi_integer                    integer1;
 578         u32                             length0;
 579         u32                             length1;
 580         acpi_status                     status = AE_OK;
 581         u8                              local_result = FALSE;
 582         int                             compare;
 583
 584
 585         ACPI_FUNCTION_TRACE ("ex_do_logical_op");
 586
 587
 588         /*
 589          * Convert the second operand if necessary.  The first operand
 590          * determines the type of the second operand, (See the Data Types
 591          * section of the ACPI 3.0+ specification.)  Both object types are
 592          * guaranteed to be either Integer/String/Buffer by the operand
 593          * resolution mechanism.
 594          */
 595         switch (ACPI_GET_OBJECT_TYPE (operand0)) {
 596         case ACPI_TYPE_INTEGER:
 597                 status = acpi_ex_convert_to_integer (operand1, &local_operand1, 16);
 598                 break;
 599
 600         case ACPI_TYPE_STRING:
 601                 status = acpi_ex_convert_to_string (operand1, &local_operand1,
 602                                  ACPI_IMPLICIT_CONVERT_HEX);
 603                 break;
 604
 605         case ACPI_TYPE_BUFFER:
 606                 status = acpi_ex_convert_to_buffer (operand1, &local_operand1);
 607                 break;
 608
 609         default:
 610                 status = AE_AML_INTERNAL;
 611                 break;
 612         }
 613
 614         if (ACPI_FAILURE (status)) {
 615                 goto cleanup;
 616         }
 617
 618         /*
 619          * Two cases: 1) Both Integers, 2) Both Strings or Buffers
 620          */
 621         if (ACPI_GET_OBJECT_TYPE (operand0) == ACPI_TYPE_INTEGER) {
 622                 /*
 623                  * 1) Both operands are of type integer
 624                  *    Note: local_operand1 may have changed above
 625                  */
 626                 integer0 = operand0->integer.value;
 627                 integer1 = local_operand1->integer.value;
 628
 629                 switch (opcode) {
 630                 case AML_LEQUAL_OP:             /* LEqual (Operand0, Operand1) */
 631
 632                         if (integer0 == integer1) {
 633                                 local_result = TRUE;
 634                         }
 635                         break;
 636
 637                 case AML_LGREATER_OP:           /* LGreater (Operand0, Operand1) */
 638
 639                         if (integer0 > integer1) {
 640                                 local_result = TRUE;
 641                         }
 642                         break;
 643
 644                 case AML_LLESS_OP:              /* LLess (Operand0, Operand1) */
 645
 646                         if (integer0 < integer1) {
 647                                 local_result = TRUE;
 648                         }
 649                         break;
 650
 651                 default:
 652                         status = AE_AML_INTERNAL;
 653                         break;
 654                 }
 655         }
 656         else {
 657                 /*
 658                  * 2) Both operands are Strings or both are Buffers
 659                  *    Note: Code below takes advantage of common Buffer/String
 660                  *          object fields. local_operand1 may have changed above. Use
 661                  *          memcmp to handle nulls in buffers.
 662                  */
 663                 length0 = operand0->buffer.length;
 664                 length1 = local_operand1->buffer.length;
 665
 666                 /* Lexicographic compare: compare the data bytes */
 667
 668                 compare = ACPI_MEMCMP ((const char * ) operand0->buffer.pointer,
 669                                  (const char * ) local_operand1->buffer.pointer,
 670                                  (length0 > length1) ? length1 : length0);
 671
 672                 switch (opcode) {
 673                 case AML_LEQUAL_OP:             /* LEqual (Operand0, Operand1) */
 674
 675                         /* Length and all bytes must be equal */
 676
 677                         if ((length0 == length1) &&
 678                                 (compare == 0)) {
 679                                 /* Length and all bytes match ==> TRUE */
 680
 681                                 local_result = TRUE;
 682                         }
 683                         break;
 684
 685                 case AML_LGREATER_OP:           /* LGreater (Operand0, Operand1) */
 686
 687                         if (compare > 0) {
 688                                 local_result = TRUE;
 689                                 goto cleanup;   /* TRUE */
 690                         }
 691                         if (compare < 0) {
 692                                 goto cleanup;   /* FALSE */
 693                         }
 694
 695                         /* Bytes match (to shortest length), compare lengths */
 696
 697                         if (length0 > length1) {
 698                                 local_result = TRUE;
 699                         }
 700                         break;
 701
 702                 case AML_LLESS_OP:              /* LLess (Operand0, Operand1) */
 703
 704                         if (compare > 0) {
 705                                 goto cleanup;   /* FALSE */
 706                         }
 707                         if (compare < 0) {
 708                                 local_result = TRUE;
 709                                 goto cleanup;   /* TRUE */
 710                         }
 711
 712                         /* Bytes match (to shortest length), compare lengths */
 713
 714                         if (length0 < length1) {
 715                                 local_result = TRUE;
 716                         }
 717                         break;
 718
 719                 default:
 720                         status = AE_AML_INTERNAL;
 721                         break;
 722                 }
 723         }
 724
 725 cleanup:
 726
 727         /* New object was created if implicit conversion performed - delete */
 728
 729         if (local_operand1 != operand1) {
 730                 acpi_ut_remove_reference (local_operand1);
 731         }
 732
 733         /* Return the logical result and status */
 734
 735         *logical_result = local_result;
 736         return_ACPI_STATUS (status);
 737 }
 738
 739