1 /******************************************************************************
2 *
3 * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2014, 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 #define __EXMISC_C__
45
46 #include "acpi.h"
47 #include "accommon.h"
48 #include "acinterp.h"
49 #include "amlcode.h"
50 #include "amlresrc.h"
51
52
53 #define _COMPONENT ACPI_EXECUTER
54 ACPI_MODULE_NAME ("exmisc")
55
56
57 /*******************************************************************************
58 *
59 * FUNCTION: AcpiExGetObjectReference
60 *
61 * PARAMETERS: ObjDesc - Create a reference to this object
62 * ReturnDesc - Where to store the reference
63 * WalkState - Current state
64 *
65 * RETURN: Status
66 *
67 * DESCRIPTION: Obtain and return a "reference" to the target object
68 * Common code for the RefOfOp and the CondRefOfOp.
69 *
70 ******************************************************************************/
71
72 ACPI_STATUS
73 AcpiExGetObjectReference (
74 ACPI_OPERAND_OBJECT *ObjDesc,
75 ACPI_OPERAND_OBJECT **ReturnDesc,
76 ACPI_WALK_STATE *WalkState)
77 {
78 ACPI_OPERAND_OBJECT *ReferenceObj;
79 ACPI_OPERAND_OBJECT *ReferencedObj;
80
81
82 ACPI_FUNCTION_TRACE_PTR (ExGetObjectReference, ObjDesc);
83
84
85 *ReturnDesc = NULL;
86
87 switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))
88 {
89 case ACPI_DESC_TYPE_OPERAND:
90
91 if (ObjDesc->Common.Type != ACPI_TYPE_LOCAL_REFERENCE)
92 {
93 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
94 }
95
96 /*
97 * Must be a reference to a Local or Arg
98 */
99 switch (ObjDesc->Reference.Class)
100 {
101 case ACPI_REFCLASS_LOCAL:
102 case ACPI_REFCLASS_ARG:
103 case ACPI_REFCLASS_DEBUG:
104
105 /* The referenced object is the pseudo-node for the local/arg */
106
107 ReferencedObj = ObjDesc->Reference.Object;
108 break;
109
110 default:
111
112 ACPI_ERROR ((AE_INFO, "Unknown Reference Class 0x%2.2X",
113 ObjDesc->Reference.Class));
114 return_ACPI_STATUS (AE_AML_INTERNAL);
115 }
116 break;
117
118 case ACPI_DESC_TYPE_NAMED:
119 /*
120 * A named reference that has already been resolved to a Node
121 */
122 ReferencedObj = ObjDesc;
123 break;
124
125 default:
126
127 ACPI_ERROR ((AE_INFO, "Invalid descriptor type 0x%X",
128 ACPI_GET_DESCRIPTOR_TYPE (ObjDesc)));
129 return_ACPI_STATUS (AE_TYPE);
130 }
131
132
133 /* Create a new reference object */
134
135 ReferenceObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE);
136 if (!ReferenceObj)
137 {
138 return_ACPI_STATUS (AE_NO_MEMORY);
139 }
140
141 ReferenceObj->Reference.Class = ACPI_REFCLASS_REFOF;
142 ReferenceObj->Reference.Object = ReferencedObj;
143 *ReturnDesc = ReferenceObj;
144
145 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
146 "Object %p Type [%s], returning Reference %p\n",
147 ObjDesc, AcpiUtGetObjectTypeName (ObjDesc), *ReturnDesc));
148
149 return_ACPI_STATUS (AE_OK);
150 }
151
152
153 /*******************************************************************************
154 *
155 * FUNCTION: AcpiExConcatTemplate
156 *
157 * PARAMETERS: Operand0 - First source object
158 * Operand1 - Second source object
159 * ActualReturnDesc - Where to place the return object
160 * WalkState - Current walk state
161 *
162 * RETURN: Status
163 *
164 * DESCRIPTION: Concatenate two resource templates
165 *
166 ******************************************************************************/
167
168 ACPI_STATUS
169 AcpiExConcatTemplate (
170 ACPI_OPERAND_OBJECT *Operand0,
171 ACPI_OPERAND_OBJECT *Operand1,
172 ACPI_OPERAND_OBJECT **ActualReturnDesc,
173 ACPI_WALK_STATE *WalkState)
174 {
175 ACPI_STATUS Status;
176 ACPI_OPERAND_OBJECT *ReturnDesc;
177 UINT8 *NewBuf;
178 UINT8 *EndTag;
179 ACPI_SIZE Length0;
180 ACPI_SIZE Length1;
181 ACPI_SIZE NewLength;
182
183
184 ACPI_FUNCTION_TRACE (ExConcatTemplate);
185
186
187 /*
188 * Find the EndTag descriptor in each resource template.
189 * Note1: returned pointers point TO the EndTag, not past it.
190 * Note2: zero-length buffers are allowed; treated like one EndTag
191 */
192
193 /* Get the length of the first resource template */
194
195 Status = AcpiUtGetResourceEndTag (Operand0, &EndTag);
196 if (ACPI_FAILURE (Status))
197 {
198 return_ACPI_STATUS (Status);
199 }
200
201 Length0 = ACPI_PTR_DIFF (EndTag, Operand0->Buffer.Pointer);
202
203 /* Get the length of the second resource template */
204
205 Status = AcpiUtGetResourceEndTag (Operand1, &EndTag);
206 if (ACPI_FAILURE (Status))
207 {
208 return_ACPI_STATUS (Status);
209 }
210
211 Length1 = ACPI_PTR_DIFF (EndTag, Operand1->Buffer.Pointer);
212
213 /* Combine both lengths, minimum size will be 2 for EndTag */
214
215 NewLength = Length0 + Length1 + sizeof (AML_RESOURCE_END_TAG);
216
217 /* Create a new buffer object for the result (with one EndTag) */
218
219 ReturnDesc = AcpiUtCreateBufferObject (NewLength);
220 if (!ReturnDesc)
221 {
222 return_ACPI_STATUS (AE_NO_MEMORY);
223 }
224
225 /*
226 * Copy the templates to the new buffer, 0 first, then 1 follows. One
227 * EndTag descriptor is copied from Operand1.
228 */
229 NewBuf = ReturnDesc->Buffer.Pointer;
230 ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer, Length0);
231 ACPI_MEMCPY (NewBuf + Length0, Operand1->Buffer.Pointer, Length1);
232
233 /* Insert EndTag and set the checksum to zero, means "ignore checksum" */
234
235 NewBuf[NewLength - 1] = 0;
236 NewBuf[NewLength - 2] = ACPI_RESOURCE_NAME_END_TAG | 1;
237
238 /* Return the completed resource template */
239
240 *ActualReturnDesc = ReturnDesc;
241 return_ACPI_STATUS (AE_OK);
242 }
243
244
245 /*******************************************************************************
246 *
247 * FUNCTION: AcpiExDoConcatenate
248 *
249 * PARAMETERS: Operand0 - First source object
250 * Operand1 - Second source object
251 * ActualReturnDesc - Where to place the return object
252 * WalkState - Current walk state
253 *
254 * RETURN: Status
255 *
256 * DESCRIPTION: Concatenate two objects OF THE SAME TYPE.
257 *
258 ******************************************************************************/
259
260 ACPI_STATUS
261 AcpiExDoConcatenate (
262 ACPI_OPERAND_OBJECT *Operand0,
263 ACPI_OPERAND_OBJECT *Operand1,
264 ACPI_OPERAND_OBJECT **ActualReturnDesc,
265 ACPI_WALK_STATE *WalkState)
266 {
267 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1;
268 ACPI_OPERAND_OBJECT *ReturnDesc;
269 char *NewBuf;
270 ACPI_STATUS Status;
271
272
273 ACPI_FUNCTION_TRACE (ExDoConcatenate);
274
275
276 /*
277 * Convert the second operand if necessary. The first operand
278 * determines the type of the second operand, (See the Data Types
279 * section of the ACPI specification.) Both object types are
280 * guaranteed to be either Integer/String/Buffer by the operand
281 * resolution mechanism.
282 */
283 switch (Operand0->Common.Type)
284 {
285 case ACPI_TYPE_INTEGER:
286
287 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16);
288 break;
289
290 case ACPI_TYPE_STRING:
291
292 Status = AcpiExConvertToString (Operand1, &LocalOperand1,
293 ACPI_IMPLICIT_CONVERT_HEX);
294 break;
295
296 case ACPI_TYPE_BUFFER:
297
298 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1);
299 break;
300
301 default:
302
303 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X",
304 Operand0->Common.Type));
305 Status = AE_AML_INTERNAL;
306 }
307
308 if (ACPI_FAILURE (Status))
309 {
310 goto Cleanup;
311 }
312
313 /*
314 * Both operands are now known to be the same object type
315 * (Both are Integer, String, or Buffer), and we can now perform the
316 * concatenation.
317 */
318
319 /*
320 * There are three cases to handle:
321 *
322 * 1) Two Integers concatenated to produce a new Buffer
323 * 2) Two Strings concatenated to produce a new String
324 * 3) Two Buffers concatenated to produce a new Buffer
325 */
326 switch (Operand0->Common.Type)
327 {
328 case ACPI_TYPE_INTEGER:
329
330 /* Result of two Integers is a Buffer */
331 /* Need enough buffer space for two integers */
332
333 ReturnDesc = AcpiUtCreateBufferObject ((ACPI_SIZE)
334 ACPI_MUL_2 (AcpiGbl_IntegerByteWidth));
335 if (!ReturnDesc)
336 {
337 Status = AE_NO_MEMORY;
338 goto Cleanup;
339 }
340
341 NewBuf = (char *) ReturnDesc->Buffer.Pointer;
342
343 /* Copy the first integer, LSB first */
344
345 ACPI_MEMCPY (NewBuf, &Operand0->Integer.Value,
346 AcpiGbl_IntegerByteWidth);
347
348 /* Copy the second integer (LSB first) after the first */
349
350 ACPI_MEMCPY (NewBuf + AcpiGbl_IntegerByteWidth,
351 &LocalOperand1->Integer.Value,
352 AcpiGbl_IntegerByteWidth);
353 break;
354
355 case ACPI_TYPE_STRING:
356
357 /* Result of two Strings is a String */
358
359 ReturnDesc = AcpiUtCreateStringObject (
360 ((ACPI_SIZE) Operand0->String.Length +
361 LocalOperand1->String.Length));
362 if (!ReturnDesc)
363 {
364 Status = AE_NO_MEMORY;
365 goto Cleanup;
366 }
367
368 NewBuf = ReturnDesc->String.Pointer;
369
370 /* Concatenate the strings */
371
372 ACPI_STRCPY (NewBuf, Operand0->String.Pointer);
373 ACPI_STRCPY (NewBuf + Operand0->String.Length,
374 LocalOperand1->String.Pointer);
375 break;
376
377 case ACPI_TYPE_BUFFER:
378
379 /* Result of two Buffers is a Buffer */
380
381 ReturnDesc = AcpiUtCreateBufferObject (
382 ((ACPI_SIZE) Operand0->Buffer.Length +
383 LocalOperand1->Buffer.Length));
384 if (!ReturnDesc)
385 {
386 Status = AE_NO_MEMORY;
387 goto Cleanup;
388 }
389
390 NewBuf = (char *) ReturnDesc->Buffer.Pointer;
391
392 /* Concatenate the buffers */
393
394 ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer,
395 Operand0->Buffer.Length);
396 ACPI_MEMCPY (NewBuf + Operand0->Buffer.Length,
397 LocalOperand1->Buffer.Pointer,
398 LocalOperand1->Buffer.Length);
399 break;
400
401 default:
402
403 /* Invalid object type, should not happen here */
404
405 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X",
406 Operand0->Common.Type));
407 Status =AE_AML_INTERNAL;
408 goto Cleanup;
409 }
410
411 *ActualReturnDesc = ReturnDesc;
412
413 Cleanup:
414 if (LocalOperand1 != Operand1)
415 {
416 AcpiUtRemoveReference (LocalOperand1);
417 }
418 return_ACPI_STATUS (Status);
419 }
420
421
422 /*******************************************************************************
423 *
424 * FUNCTION: AcpiExDoMathOp
425 *
426 * PARAMETERS: Opcode - AML opcode
427 * Integer0 - Integer operand #0
428 * Integer1 - Integer operand #1
429 *
430 * RETURN: Integer result of the operation
431 *
432 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
433 * math functions here is to prevent a lot of pointer dereferencing
434 * to obtain the operands.
435 *
436 ******************************************************************************/
437
438 UINT64
439 AcpiExDoMathOp (
440 UINT16 Opcode,
441 UINT64 Integer0,
442 UINT64 Integer1)
443 {
444
445 ACPI_FUNCTION_ENTRY ();
446
447
448 switch (Opcode)
449 {
450 case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */
451
452 return (Integer0 + Integer1);
453
454 case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */
455
456 return (Integer0 & Integer1);
457
458 case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */
459
460 return (~(Integer0 & Integer1));
461
462 case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */
463
464 return (Integer0 | Integer1);
465
466 case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */
467
468 return (~(Integer0 | Integer1));
469
470 case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */
471
472 return (Integer0 ^ Integer1);
473
474 case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */
475
476 return (Integer0 * Integer1);
477
478 case AML_SHIFT_LEFT_OP: /* ShiftLeft (Operand, ShiftCount, Result)*/
479
480 /*
481 * We need to check if the shiftcount is larger than the integer bit
482 * width since the behavior of this is not well-defined in the C language.
483 */
484 if (Integer1 >= AcpiGbl_IntegerBitWidth)
485 {
486 return (0);
487 }
488 return (Integer0 << Integer1);
489
490 case AML_SHIFT_RIGHT_OP: /* ShiftRight (Operand, ShiftCount, Result) */
491
492 /*
493 * We need to check if the shiftcount is larger than the integer bit
494 * width since the behavior of this is not well-defined in the C language.
495 */
496 if (Integer1 >= AcpiGbl_IntegerBitWidth)
497 {
498 return (0);
499 }
500 return (Integer0 >> Integer1);
501
502 case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */
503
504 return (Integer0 - Integer1);
505
506 default:
507
508 return (0);
509 }
510 }
511
512
513 /*******************************************************************************
514 *
515 * FUNCTION: AcpiExDoLogicalNumericOp
516 *
517 * PARAMETERS: Opcode - AML opcode
518 * Integer0 - Integer operand #0
519 * Integer1 - Integer operand #1
520 * LogicalResult - TRUE/FALSE result of the operation
521 *
522 * RETURN: Status
523 *
524 * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric
525 * operators (LAnd and LOr), both operands must be integers.
526 *
527 * Note: cleanest machine code seems to be produced by the code
528 * below, rather than using statements of the form:
529 * Result = (Integer0 && Integer1);
530 *
531 ******************************************************************************/
532
533 ACPI_STATUS
534 AcpiExDoLogicalNumericOp (
535 UINT16 Opcode,
536 UINT64 Integer0,
537 UINT64 Integer1,
538 BOOLEAN *LogicalResult)
539 {
540 ACPI_STATUS Status = AE_OK;
541 BOOLEAN LocalResult = FALSE;
542
543
544 ACPI_FUNCTION_TRACE (ExDoLogicalNumericOp);
545
546
547 switch (Opcode)
548 {
549 case AML_LAND_OP: /* LAnd (Integer0, Integer1) */
550
551 if (Integer0 && Integer1)
552 {
553 LocalResult = TRUE;
554 }
555 break;
556
557 case AML_LOR_OP: /* LOr (Integer0, Integer1) */
558
559 if (Integer0 || Integer1)
560 {
561 LocalResult = TRUE;
562 }
563 break;
564
565 default:
566
567 Status = AE_AML_INTERNAL;
568 break;
569 }
570
571 /* Return the logical result and status */
572
573 *LogicalResult = LocalResult;
574 return_ACPI_STATUS (Status);
575 }
576
577
578 /*******************************************************************************
579 *
580 * FUNCTION: AcpiExDoLogicalOp
581 *
582 * PARAMETERS: Opcode - AML opcode
583 * Operand0 - operand #0
584 * Operand1 - operand #1
585 * LogicalResult - TRUE/FALSE result of the operation
586 *
587 * RETURN: Status
588 *
589 * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
590 * functions here is to prevent a lot of pointer dereferencing
591 * to obtain the operands and to simplify the generation of the
592 * logical value. For the Numeric operators (LAnd and LOr), both
593 * operands must be integers. For the other logical operators,
594 * operands can be any combination of Integer/String/Buffer. The
595 * first operand determines the type to which the second operand
596 * will be converted.
597 *
598 * Note: cleanest machine code seems to be produced by the code
599 * below, rather than using statements of the form:
600 * Result = (Operand0 == Operand1);
601 *
602 ******************************************************************************/
603
604 ACPI_STATUS
605 AcpiExDoLogicalOp (
606 UINT16 Opcode,
607 ACPI_OPERAND_OBJECT *Operand0,
608 ACPI_OPERAND_OBJECT *Operand1,
609 BOOLEAN *LogicalResult)
610 {
611 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1;
612 UINT64 Integer0;
613 UINT64 Integer1;
614 UINT32 Length0;
615 UINT32 Length1;
616 ACPI_STATUS Status = AE_OK;
617 BOOLEAN LocalResult = FALSE;
618 int Compare;
619
620
621 ACPI_FUNCTION_TRACE (ExDoLogicalOp);
622
623
624 /*
625 * Convert the second operand if necessary. The first operand
626 * determines the type of the second operand, (See the Data Types
627 * section of the ACPI 3.0+ specification.) Both object types are
628 * guaranteed to be either Integer/String/Buffer by the operand
629 * resolution mechanism.
630 */
631 switch (Operand0->Common.Type)
632 {
633 case ACPI_TYPE_INTEGER:
634
635 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16);
636 break;
637
638 case ACPI_TYPE_STRING:
639
640 Status = AcpiExConvertToString (Operand1, &LocalOperand1,
641 ACPI_IMPLICIT_CONVERT_HEX);
642 break;
643
644 case ACPI_TYPE_BUFFER:
645
646 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1);
647 break;
648
649 default:
650
651 Status = AE_AML_INTERNAL;
652 break;
653 }
654
655 if (ACPI_FAILURE (Status))
656 {
657 goto Cleanup;
658 }
659
660 /*
661 * Two cases: 1) Both Integers, 2) Both Strings or Buffers
662 */
663 if (Operand0->Common.Type == ACPI_TYPE_INTEGER)
664 {
665 /*
666 * 1) Both operands are of type integer
667 * Note: LocalOperand1 may have changed above
668 */
669 Integer0 = Operand0->Integer.Value;
670 Integer1 = LocalOperand1->Integer.Value;
671
672 switch (Opcode)
673 {
674 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
675
676 if (Integer0 == Integer1)
677 {
678 LocalResult = TRUE;
679 }
680 break;
681
682 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
683
684 if (Integer0 > Integer1)
685 {
686 LocalResult = TRUE;
687 }
688 break;
689
690 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
691
692 if (Integer0 < Integer1)
693 {
694 LocalResult = TRUE;
695 }
696 break;
697
698 default:
699
700 Status = AE_AML_INTERNAL;
701 break;
702 }
703 }
704 else
705 {
706 /*
707 * 2) Both operands are Strings or both are Buffers
708 * Note: Code below takes advantage of common Buffer/String
709 * object fields. LocalOperand1 may have changed above. Use
710 * memcmp to handle nulls in buffers.
711 */
712 Length0 = Operand0->Buffer.Length;
713 Length1 = LocalOperand1->Buffer.Length;
714
715 /* Lexicographic compare: compare the data bytes */
716
717 Compare = ACPI_MEMCMP (Operand0->Buffer.Pointer,
718 LocalOperand1->Buffer.Pointer,
719 (Length0 > Length1) ? Length1 : Length0);
720
721 switch (Opcode)
722 {
723 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
724
725 /* Length and all bytes must be equal */
726
727 if ((Length0 == Length1) &&
728 (Compare == 0))
729 {
730 /* Length and all bytes match ==> TRUE */
731
732 LocalResult = TRUE;
733 }
734 break;
735
736 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
737
738 if (Compare > 0)
739 {
740 LocalResult = TRUE;
741 goto Cleanup; /* TRUE */
742 }
743 if (Compare < 0)
744 {
745 goto Cleanup; /* FALSE */
746 }
747
748 /* Bytes match (to shortest length), compare lengths */
749
750 if (Length0 > Length1)
751 {
752 LocalResult = TRUE;
753 }
754 break;
755
756 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
757
758 if (Compare > 0)
759 {
760 goto Cleanup; /* FALSE */
761 }
762 if (Compare < 0)
763 {
764 LocalResult = TRUE;
765 goto Cleanup; /* TRUE */
766 }
767
768 /* Bytes match (to shortest length), compare lengths */
769
770 if (Length0 < Length1)
771 {
772 LocalResult = TRUE;
773 }
774 break;
775
776 default:
777
778 Status = AE_AML_INTERNAL;
779 break;
780 }
781 }
782
783 Cleanup:
784
785 /* New object was created if implicit conversion performed - delete */
786
787 if (LocalOperand1 != Operand1)
788 {
789 AcpiUtRemoveReference (LocalOperand1);
790 }
791
792 /* Return the logical result and status */
793
794 *LogicalResult = LocalResult;
795 return_ACPI_STATUS (Status);
796 }