drivers/acpi/acpica/exmisc.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acinterp.h"
  47 #include "amlcode.h"
  48 #include "amlresrc.h"
  49
  50 #define _COMPONENT          ACPI_EXECUTER
  51 ACPI_MODULE_NAME("exmisc")
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_ex_get_object_reference
  56  *
  57  * PARAMETERS:  obj_desc            - Create a reference to this object
  58  *              return_desc         - Where to store the reference
  59  *              walk_state          - Current state
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Obtain and return a "reference" to the target object
  64  *              Common code for the ref_of_op and the cond_ref_of_op.
  65  *
  66  ******************************************************************************/
  67 acpi_status
  68 acpi_ex_get_object_reference(union acpi_operand_object *obj_desc,
  69                              union acpi_operand_object **return_desc,
  70                              struct acpi_walk_state *walk_state)
  71 {
  72         union acpi_operand_object *reference_obj;
  73         union acpi_operand_object *referenced_obj;
  74
  75         ACPI_FUNCTION_TRACE_PTR(ex_get_object_reference, obj_desc);
  76
  77         *return_desc = NULL;
  78
  79         switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) {
  80         case ACPI_DESC_TYPE_OPERAND:
  81
  82                 if (obj_desc->common.type != ACPI_TYPE_LOCAL_REFERENCE) {
  83                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
  84                 }
  85
  86                 /*
  87                  * Must be a reference to a Local or Arg
  88                  */
  89                 switch (obj_desc->reference.class) {
  90                 case ACPI_REFCLASS_LOCAL:
  91                 case ACPI_REFCLASS_ARG:
  92                 case ACPI_REFCLASS_DEBUG:
  93
  94                         /* The referenced object is the pseudo-node for the local/arg */
  95
  96                         referenced_obj = obj_desc->reference.object;
  97                         break;
  98
  99                 default:
 100
 101                         ACPI_ERROR((AE_INFO, "Unknown Reference Class 0x%2.2X",
 102                                     obj_desc->reference.class));
 103                         return_ACPI_STATUS(AE_AML_INTERNAL);
 104                 }
 105                 break;
 106
 107         case ACPI_DESC_TYPE_NAMED:
 108                 /*
 109                  * A named reference that has already been resolved to a Node
 110                  */
 111                 referenced_obj = obj_desc;
 112                 break;
 113
 114         default:
 115
 116                 ACPI_ERROR((AE_INFO, "Invalid descriptor type 0x%X",
 117                             ACPI_GET_DESCRIPTOR_TYPE(obj_desc)));
 118                 return_ACPI_STATUS(AE_TYPE);
 119         }
 120
 121         /* Create a new reference object */
 122
 123         reference_obj =
 124             acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
 125         if (!reference_obj) {
 126                 return_ACPI_STATUS(AE_NO_MEMORY);
 127         }
 128
 129         reference_obj->reference.class = ACPI_REFCLASS_REFOF;
 130         reference_obj->reference.object = referenced_obj;
 131         *return_desc = reference_obj;
 132
 133         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 134                           "Object %p Type [%s], returning Reference %p\n",
 135                           obj_desc, acpi_ut_get_object_type_name(obj_desc),
 136                           *return_desc));
 137
 138         return_ACPI_STATUS(AE_OK);
 139 }
 140
 141 /*******************************************************************************
 142  *
 143  * FUNCTION:    acpi_ex_concat_template
 144  *
 145  * PARAMETERS:  operand0            - First source object
 146  *              operand1            - Second source object
 147  *              actual_return_desc  - Where to place the return object
 148  *              walk_state          - Current walk state
 149  *
 150  * RETURN:      Status
 151  *
 152  * DESCRIPTION: Concatenate two resource templates
 153  *
 154  ******************************************************************************/
 155
 156 acpi_status
 157 acpi_ex_concat_template(union acpi_operand_object *operand0,
 158                         union acpi_operand_object *operand1,
 159                         union acpi_operand_object **actual_return_desc,
 160                         struct acpi_walk_state *walk_state)
 161 {
 162         acpi_status status;
 163         union acpi_operand_object *return_desc;
 164         u8 *new_buf;
 165         u8 *end_tag;
 166         acpi_size length0;
 167         acpi_size length1;
 168         acpi_size new_length;
 169
 170         ACPI_FUNCTION_TRACE(ex_concat_template);
 171
 172         /*
 173          * Find the end_tag descriptor in each resource template.
 174          * Note1: returned pointers point TO the end_tag, not past it.
 175          * Note2: zero-length buffers are allowed; treated like one end_tag
 176          */
 177
 178         /* Get the length of the first resource template */
 179
 180         status = acpi_ut_get_resource_end_tag(operand0, &end_tag);
 181         if (ACPI_FAILURE(status)) {
 182                 return_ACPI_STATUS(status);
 183         }
 184
 185         length0 = ACPI_PTR_DIFF(end_tag, operand0->buffer.pointer);
 186
 187         /* Get the length of the second resource template */
 188
 189         status = acpi_ut_get_resource_end_tag(operand1, &end_tag);
 190         if (ACPI_FAILURE(status)) {
 191                 return_ACPI_STATUS(status);
 192         }
 193
 194         length1 = ACPI_PTR_DIFF(end_tag, operand1->buffer.pointer);
 195
 196         /* Combine both lengths, minimum size will be 2 for end_tag */
 197
 198         new_length = length0 + length1 + sizeof(struct aml_resource_end_tag);
 199
 200         /* Create a new buffer object for the result (with one end_tag) */
 201
 202         return_desc = acpi_ut_create_buffer_object(new_length);
 203         if (!return_desc) {
 204                 return_ACPI_STATUS(AE_NO_MEMORY);
 205         }
 206
 207         /*
 208          * Copy the templates to the new buffer, 0 first, then 1 follows. One
 209          * end_tag descriptor is copied from Operand1.
 210          */
 211         new_buf = return_desc->buffer.pointer;
 212         ACPI_MEMCPY(new_buf, operand0->buffer.pointer, length0);
 213         ACPI_MEMCPY(new_buf + length0, operand1->buffer.pointer, length1);
 214
 215         /* Insert end_tag and set the checksum to zero, means "ignore checksum" */
 216
 217         new_buf[new_length - 1] = 0;
 218         new_buf[new_length - 2] = ACPI_RESOURCE_NAME_END_TAG | 1;
 219
 220         /* Return the completed resource template */
 221
 222         *actual_return_desc = return_desc;
 223         return_ACPI_STATUS(AE_OK);
 224 }
 225
 226 /*******************************************************************************
 227  *
 228  * FUNCTION:    acpi_ex_do_concatenate
 229  *
 230  * PARAMETERS:  operand0            - First source object
 231  *              operand1            - Second source object
 232  *              actual_return_desc  - Where to place the return object
 233  *              walk_state          - Current walk state
 234  *
 235  * RETURN:      Status
 236  *
 237  * DESCRIPTION: Concatenate two objects OF THE SAME TYPE.
 238  *
 239  ******************************************************************************/
 240
 241 acpi_status
 242 acpi_ex_do_concatenate(union acpi_operand_object *operand0,
 243                        union acpi_operand_object *operand1,
 244                        union acpi_operand_object **actual_return_desc,
 245                        struct acpi_walk_state *walk_state)
 246 {
 247         union acpi_operand_object *local_operand1 = operand1;
 248         union acpi_operand_object *return_desc;
 249         char *new_buf;
 250         acpi_status status;
 251
 252         ACPI_FUNCTION_TRACE(ex_do_concatenate);
 253
 254         /*
 255          * Convert the second operand if necessary. The first operand
 256          * determines the type of the second operand, (See the Data Types
 257          * section of the ACPI specification.)  Both object types are
 258          * guaranteed to be either Integer/String/Buffer by the operand
 259          * resolution mechanism.
 260          */
 261         switch (operand0->common.type) {
 262         case ACPI_TYPE_INTEGER:
 263
 264                 status =
 265                     acpi_ex_convert_to_integer(operand1, &local_operand1, 16);
 266                 break;
 267
 268         case ACPI_TYPE_STRING:
 269
 270                 status = acpi_ex_convert_to_string(operand1, &local_operand1,
 271                                                    ACPI_IMPLICIT_CONVERT_HEX);
 272                 break;
 273
 274         case ACPI_TYPE_BUFFER:
 275
 276                 status = acpi_ex_convert_to_buffer(operand1, &local_operand1);
 277                 break;
 278
 279         default:
 280
 281                 ACPI_ERROR((AE_INFO, "Invalid object type: 0x%X",
 282                             operand0->common.type));
 283                 status = AE_AML_INTERNAL;
 284         }
 285
 286         if (ACPI_FAILURE(status)) {
 287                 goto cleanup;
 288         }
 289
 290         /*
 291          * Both operands are now known to be the same object type
 292          * (Both are Integer, String, or Buffer), and we can now perform the
 293          * concatenation.
 294          */
 295
 296         /*
 297          * There are three cases to handle:
 298          *
 299          * 1) Two Integers concatenated to produce a new Buffer
 300          * 2) Two Strings concatenated to produce a new String
 301          * 3) Two Buffers concatenated to produce a new Buffer
 302          */
 303         switch (operand0->common.type) {
 304         case ACPI_TYPE_INTEGER:
 305
 306                 /* Result of two Integers is a Buffer */
 307                 /* Need enough buffer space for two integers */
 308
 309                 return_desc = acpi_ut_create_buffer_object((acpi_size)
 310                                                            ACPI_MUL_2
 311                                                            (acpi_gbl_integer_byte_width));
 312                 if (!return_desc) {
 313                         status = AE_NO_MEMORY;
 314                         goto cleanup;
 315                 }
 316
 317                 new_buf = (char *)return_desc->buffer.pointer;
 318
 319                 /* Copy the first integer, LSB first */
 320
 321                 ACPI_MEMCPY(new_buf, &operand0->integer.value,
 322                             acpi_gbl_integer_byte_width);
 323
 324                 /* Copy the second integer (LSB first) after the first */
 325
 326                 ACPI_MEMCPY(new_buf + acpi_gbl_integer_byte_width,
 327                             &local_operand1->integer.value,
 328                             acpi_gbl_integer_byte_width);
 329                 break;
 330
 331         case ACPI_TYPE_STRING:
 332
 333                 /* Result of two Strings is a String */
 334
 335                 return_desc = acpi_ut_create_string_object(((acpi_size)
 336                                                             operand0->string.
 337                                                             length +
 338                                                             local_operand1->
 339                                                             string.length));
 340                 if (!return_desc) {
 341                         status = AE_NO_MEMORY;
 342                         goto cleanup;
 343                 }
 344
 345                 new_buf = return_desc->string.pointer;
 346
 347                 /* Concatenate the strings */
 348
 349                 ACPI_STRCPY(new_buf, 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(((acpi_size)
 359                                                             operand0->buffer.
 360                                                             length +
 361                                                             local_operand1->
 362                                                             buffer.length));
 363                 if (!return_desc) {
 364                         status = AE_NO_MEMORY;
 365                         goto cleanup;
 366                 }
 367
 368                 new_buf = (char *)return_desc->buffer.pointer;
 369
 370                 /* Concatenate the buffers */
 371
 372                 ACPI_MEMCPY(new_buf, operand0->buffer.pointer,
 373                             operand0->buffer.length);
 374                 ACPI_MEMCPY(new_buf + operand0->buffer.length,
 375                             local_operand1->buffer.pointer,
 376                             local_operand1->buffer.length);
 377                 break;
 378
 379         default:
 380
 381                 /* Invalid object type, should not happen here */
 382
 383                 ACPI_ERROR((AE_INFO, "Invalid object type: 0x%X",
 384                             operand0->common.type));
 385                 status = AE_AML_INTERNAL;
 386                 goto cleanup;
 387         }
 388
 389         *actual_return_desc = return_desc;
 390
 391 cleanup:
 392         if (local_operand1 != operand1) {
 393                 acpi_ut_remove_reference(local_operand1);
 394         }
 395         return_ACPI_STATUS(status);
 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 u64 acpi_ex_do_math_op(u16 opcode, u64 integer0, u64 integer1)
 415 {
 416
 417         ACPI_FUNCTION_ENTRY();
 418
 419         switch (opcode) {
 420         case AML_ADD_OP:        /* Add (Integer0, Integer1, Result) */
 421
 422                 return (integer0 + integer1);
 423
 424         case AML_BIT_AND_OP:    /* And (Integer0, Integer1, Result) */
 425
 426                 return (integer0 & integer1);
 427
 428         case AML_BIT_NAND_OP:   /* NAnd (Integer0, Integer1, Result) */
 429
 430                 return (~(integer0 & integer1));
 431
 432         case AML_BIT_OR_OP:     /* Or (Integer0, Integer1, Result) */
 433
 434                 return (integer0 | integer1);
 435
 436         case AML_BIT_NOR_OP:    /* NOr (Integer0, Integer1, Result) */
 437
 438                 return (~(integer0 | integer1));
 439
 440         case AML_BIT_XOR_OP:    /* XOr (Integer0, Integer1, Result) */
 441
 442                 return (integer0 ^ integer1);
 443
 444         case AML_MULTIPLY_OP:   /* Multiply (Integer0, Integer1, Result) */
 445
 446                 return (integer0 * integer1);
 447
 448         case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result) */
 449
 450                 /*
 451                  * We need to check if the shiftcount is larger than the integer bit
 452                  * width since the behavior of this is not well-defined in the C language.
 453                  */
 454                 if (integer1 >= acpi_gbl_integer_bit_width) {
 455                         return (0);
 456                 }
 457                 return (integer0 << integer1);
 458
 459         case AML_SHIFT_RIGHT_OP:        /* shift_right (Operand, shift_count, Result) */
 460
 461                 /*
 462                  * We need to check if the shiftcount is larger than the integer bit
 463                  * width since the behavior of this is not well-defined in the C language.
 464                  */
 465                 if (integer1 >= acpi_gbl_integer_bit_width) {
 466                         return (0);
 467                 }
 468                 return (integer0 >> integer1);
 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  * FUNCTION:    acpi_ex_do_logical_numeric_op
 483  *
 484  * PARAMETERS:  opcode              - AML opcode
 485  *              integer0            - Integer operand #0
 486  *              integer1            - Integer operand #1
 487  *              logical_result      - TRUE/FALSE result of the operation
 488  *
 489  * RETURN:      Status
 490  *
 491  * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric
 492  *              operators (LAnd and LOr), both operands must be integers.
 493  *
 494  *              Note: cleanest machine code seems to be produced by the code
 495  *              below, rather than using statements of the form:
 496  *                  Result = (Integer0 && Integer1);
 497  *
 498  ******************************************************************************/
 499
 500 acpi_status
 501 acpi_ex_do_logical_numeric_op(u16 opcode,
 502                               u64 integer0, u64 integer1, u8 *logical_result)
 503 {
 504         acpi_status status = AE_OK;
 505         u8 local_result = FALSE;
 506
 507         ACPI_FUNCTION_TRACE(ex_do_logical_numeric_op);
 508
 509         switch (opcode) {
 510         case AML_LAND_OP:       /* LAnd (Integer0, Integer1) */
 511
 512                 if (integer0 && integer1) {
 513                         local_result = TRUE;
 514                 }
 515                 break;
 516
 517         case AML_LOR_OP:        /* LOr (Integer0, Integer1) */
 518
 519                 if (integer0 || integer1) {
 520                         local_result = TRUE;
 521                 }
 522                 break;
 523
 524         default:
 525
 526                 status = AE_AML_INTERNAL;
 527                 break;
 528         }
 529
 530         /* Return the logical result and status */
 531
 532         *logical_result = local_result;
 533         return_ACPI_STATUS(status);
 534 }
 535
 536 /*******************************************************************************
 537  *
 538  * FUNCTION:    acpi_ex_do_logical_op
 539  *
 540  * PARAMETERS:  opcode              - AML opcode
 541  *              operand0            - operand #0
 542  *              operand1            - operand #1
 543  *              logical_result      - TRUE/FALSE result of the operation
 544  *
 545  * RETURN:      Status
 546  *
 547  * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
 548  *              functions here is to prevent a lot of pointer dereferencing
 549  *              to obtain the operands and to simplify the generation of the
 550  *              logical value. For the Numeric operators (LAnd and LOr), both
 551  *              operands must be integers. For the other logical operators,
 552  *              operands can be any combination of Integer/String/Buffer. The
 553  *              first operand determines the type to which the second operand
 554  *              will be converted.
 555  *
 556  *              Note: cleanest machine code seems to be produced by the code
 557  *              below, rather than using statements of the form:
 558  *                  Result = (Operand0 == Operand1);
 559  *
 560  ******************************************************************************/
 561
 562 acpi_status
 563 acpi_ex_do_logical_op(u16 opcode,
 564                       union acpi_operand_object *operand0,
 565                       union acpi_operand_object *operand1, u8 * logical_result)
 566 {
 567         union acpi_operand_object *local_operand1 = operand1;
 568         u64 integer0;
 569         u64 integer1;
 570         u32 length0;
 571         u32 length1;
 572         acpi_status status = AE_OK;
 573         u8 local_result = FALSE;
 574         int compare;
 575
 576         ACPI_FUNCTION_TRACE(ex_do_logical_op);
 577
 578         /*
 579          * Convert the second operand if necessary. The first operand
 580          * determines the type of the second operand, (See the Data Types
 581          * section of the ACPI 3.0+ specification.)  Both object types are
 582          * guaranteed to be either Integer/String/Buffer by the operand
 583          * resolution mechanism.
 584          */
 585         switch (operand0->common.type) {
 586         case ACPI_TYPE_INTEGER:
 587
 588                 status =
 589                     acpi_ex_convert_to_integer(operand1, &local_operand1, 16);
 590                 break;
 591
 592         case ACPI_TYPE_STRING:
 593
 594                 status = acpi_ex_convert_to_string(operand1, &local_operand1,
 595                                                    ACPI_IMPLICIT_CONVERT_HEX);
 596                 break;
 597
 598         case ACPI_TYPE_BUFFER:
 599
 600                 status = acpi_ex_convert_to_buffer(operand1, &local_operand1);
 601                 break;
 602
 603         default:
 604
 605                 status = AE_AML_INTERNAL;
 606                 break;
 607         }
 608
 609         if (ACPI_FAILURE(status)) {
 610                 goto cleanup;
 611         }
 612
 613         /*
 614          * Two cases: 1) Both Integers, 2) Both Strings or Buffers
 615          */
 616         if (operand0->common.type == ACPI_TYPE_INTEGER) {
 617                 /*
 618                  * 1) Both operands are of type integer
 619                  *    Note: local_operand1 may have changed above
 620                  */
 621                 integer0 = operand0->integer.value;
 622                 integer1 = local_operand1->integer.value;
 623
 624                 switch (opcode) {
 625                 case AML_LEQUAL_OP:     /* LEqual (Operand0, Operand1) */
 626
 627                         if (integer0 == integer1) {
 628                                 local_result = TRUE;
 629                         }
 630                         break;
 631
 632                 case AML_LGREATER_OP:   /* LGreater (Operand0, Operand1) */
 633
 634                         if (integer0 > integer1) {
 635                                 local_result = TRUE;
 636                         }
 637                         break;
 638
 639                 case AML_LLESS_OP:      /* LLess (Operand0, Operand1) */
 640
 641                         if (integer0 < integer1) {
 642                                 local_result = TRUE;
 643                         }
 644                         break;
 645
 646                 default:
 647
 648                         status = AE_AML_INTERNAL;
 649                         break;
 650                 }
 651         } else {
 652                 /*
 653                  * 2) Both operands are Strings or both are Buffers
 654                  *    Note: Code below takes advantage of common Buffer/String
 655                  *          object fields. local_operand1 may have changed above. Use
 656                  *          memcmp to handle nulls in buffers.
 657                  */
 658                 length0 = operand0->buffer.length;
 659                 length1 = local_operand1->buffer.length;
 660
 661                 /* Lexicographic compare: compare the data bytes */
 662
 663                 compare = ACPI_MEMCMP(operand0->buffer.pointer,
 664                                       local_operand1->buffer.pointer,
 665                                       (length0 > length1) ? length1 : length0);
 666
 667                 switch (opcode) {
 668                 case AML_LEQUAL_OP:     /* LEqual (Operand0, Operand1) */
 669
 670                         /* Length and all bytes must be equal */
 671
 672                         if ((length0 == length1) && (compare == 0)) {
 673
 674                                 /* Length and all bytes match ==> TRUE */
 675
 676                                 local_result = TRUE;
 677                         }
 678                         break;
 679
 680                 case AML_LGREATER_OP:   /* LGreater (Operand0, Operand1) */
 681
 682                         if (compare > 0) {
 683                                 local_result = TRUE;
 684                                 goto cleanup;   /* TRUE */
 685                         }
 686                         if (compare < 0) {
 687                                 goto cleanup;   /* FALSE */
 688                         }
 689
 690                         /* Bytes match (to shortest length), compare lengths */
 691
 692                         if (length0 > length1) {
 693                                 local_result = TRUE;
 694                         }
 695                         break;
 696
 697                 case AML_LLESS_OP:      /* LLess (Operand0, Operand1) */
 698
 699                         if (compare > 0) {
 700                                 goto cleanup;   /* FALSE */
 701                         }
 702                         if (compare < 0) {
 703                                 local_result = TRUE;
 704                                 goto cleanup;   /* TRUE */
 705                         }
 706
 707                         /* Bytes match (to shortest length), compare lengths */
 708
 709                         if (length0 < length1) {
 710                                 local_result = TRUE;
 711                         }
 712                         break;
 713
 714                 default:
 715
 716                         status = AE_AML_INTERNAL;
 717                         break;
 718                 }
 719         }
 720
 721 cleanup:
 722
 723         /* New object was created if implicit conversion performed - delete */
 724
 725         if (local_operand1 != operand1) {
 726                 acpi_ut_remove_reference(local_operand1);
 727         }
 728
 729         /* Return the logical result and status */
 730
 731         *logical_result = local_result;
 732         return_ACPI_STATUS(status);
 733 }