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1da177e4 LT |
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 | ||
44f6c012 RM |
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)); | |
1da177e4 LT |
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 | ||
73459f73 | 305 | return_desc = acpi_ut_create_buffer_object ((acpi_size) |
1da177e4 LT |
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 | ||
44f6c012 | 460 | case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result)*/ |
1da177e4 LT |
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 |