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Diffstat (limited to 'drivers/acpi/acpica/exmisc.c')
-rw-r--r-- | drivers/acpi/acpica/exmisc.c | 726 |
1 files changed, 726 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/exmisc.c b/drivers/acpi/acpica/exmisc.c new file mode 100644 index 000000000000..e445463de8a9 --- /dev/null +++ b/drivers/acpi/acpica/exmisc.c | |||
@@ -0,0 +1,726 @@ | |||
1 | |||
2 | /****************************************************************************** | ||
3 | * | ||
4 | * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes | ||
5 | * | ||
6 | *****************************************************************************/ | ||
7 | |||
8 | /* | ||
9 | * Copyright (C) 2000 - 2008, Intel Corp. | ||
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 | #include <acpi/acpi.h> | ||
46 | #include <acpi/accommon.h> | ||
47 | #include <acpi/acinterp.h> | ||
48 | #include <acpi/amlcode.h> | ||
49 | #include <acpi/amlresrc.h> | ||
50 | |||
51 | #define _COMPONENT ACPI_EXECUTER | ||
52 | ACPI_MODULE_NAME("exmisc") | ||
53 | |||
54 | /******************************************************************************* | ||
55 | * | ||
56 | * FUNCTION: acpi_ex_get_object_reference | ||
57 | * | ||
58 | * PARAMETERS: obj_desc - Create a reference to this object | ||
59 | * return_desc - Where to store the reference | ||
60 | * walk_state - Current state | ||
61 | * | ||
62 | * RETURN: Status | ||
63 | * | ||
64 | * DESCRIPTION: Obtain and return a "reference" to the target object | ||
65 | * Common code for the ref_of_op and the cond_ref_of_op. | ||
66 | * | ||
67 | ******************************************************************************/ | ||
68 | acpi_status | ||
69 | acpi_ex_get_object_reference(union acpi_operand_object *obj_desc, | ||
70 | union acpi_operand_object **return_desc, | ||
71 | struct acpi_walk_state *walk_state) | ||
72 | { | ||
73 | union acpi_operand_object *reference_obj; | ||
74 | union acpi_operand_object *referenced_obj; | ||
75 | |||
76 | ACPI_FUNCTION_TRACE_PTR(ex_get_object_reference, obj_desc); | ||
77 | |||
78 | *return_desc = NULL; | ||
79 | |||
80 | switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) { | ||
81 | case ACPI_DESC_TYPE_OPERAND: | ||
82 | |||
83 | if (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_LOCAL_REFERENCE) { | ||
84 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); | ||
85 | } | ||
86 | |||
87 | /* | ||
88 | * Must be a reference to a Local or Arg | ||
89 | */ | ||
90 | switch (obj_desc->reference.class) { | ||
91 | case ACPI_REFCLASS_LOCAL: | ||
92 | case ACPI_REFCLASS_ARG: | ||
93 | case ACPI_REFCLASS_DEBUG: | ||
94 | |||
95 | /* The referenced object is the pseudo-node for the local/arg */ | ||
96 | |||
97 | referenced_obj = obj_desc->reference.object; | ||
98 | break; | ||
99 | |||
100 | default: | ||
101 | |||
102 | ACPI_ERROR((AE_INFO, "Unknown Reference Class %2.2X", | ||
103 | obj_desc->reference.class)); | ||
104 | return_ACPI_STATUS(AE_AML_INTERNAL); | ||
105 | } | ||
106 | break; | ||
107 | |||
108 | case ACPI_DESC_TYPE_NAMED: | ||
109 | |||
110 | /* | ||
111 | * A named reference that has already been resolved to a Node | ||
112 | */ | ||
113 | referenced_obj = obj_desc; | ||
114 | break; | ||
115 | |||
116 | default: | ||
117 | |||
118 | ACPI_ERROR((AE_INFO, "Invalid descriptor type %X", | ||
119 | ACPI_GET_DESCRIPTOR_TYPE(obj_desc))); | ||
120 | return_ACPI_STATUS(AE_TYPE); | ||
121 | } | ||
122 | |||
123 | /* Create a new reference object */ | ||
124 | |||
125 | reference_obj = | ||
126 | acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE); | ||
127 | if (!reference_obj) { | ||
128 | return_ACPI_STATUS(AE_NO_MEMORY); | ||
129 | } | ||
130 | |||
131 | reference_obj->reference.class = ACPI_REFCLASS_REFOF; | ||
132 | reference_obj->reference.object = referenced_obj; | ||
133 | *return_desc = reference_obj; | ||
134 | |||
135 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, | ||
136 | "Object %p Type [%s], returning Reference %p\n", | ||
137 | obj_desc, acpi_ut_get_object_type_name(obj_desc), | ||
138 | *return_desc)); | ||
139 | |||
140 | return_ACPI_STATUS(AE_OK); | ||
141 | } | ||
142 | |||
143 | /******************************************************************************* | ||
144 | * | ||
145 | * FUNCTION: acpi_ex_concat_template | ||
146 | * | ||
147 | * PARAMETERS: Operand0 - First source object | ||
148 | * Operand1 - Second source object | ||
149 | * actual_return_desc - Where to place the return object | ||
150 | * walk_state - Current walk state | ||
151 | * | ||
152 | * RETURN: Status | ||
153 | * | ||
154 | * DESCRIPTION: Concatenate two resource templates | ||
155 | * | ||
156 | ******************************************************************************/ | ||
157 | |||
158 | acpi_status | ||
159 | acpi_ex_concat_template(union acpi_operand_object *operand0, | ||
160 | union acpi_operand_object *operand1, | ||
161 | union acpi_operand_object **actual_return_desc, | ||
162 | struct acpi_walk_state *walk_state) | ||
163 | { | ||
164 | acpi_status status; | ||
165 | union acpi_operand_object *return_desc; | ||
166 | u8 *new_buf; | ||
167 | u8 *end_tag; | ||
168 | acpi_size length0; | ||
169 | acpi_size length1; | ||
170 | acpi_size new_length; | ||
171 | |||
172 | ACPI_FUNCTION_TRACE(ex_concat_template); | ||
173 | |||
174 | /* | ||
175 | * Find the end_tag descriptor in each resource template. | ||
176 | * Note1: returned pointers point TO the end_tag, not past it. | ||
177 | * Note2: zero-length buffers are allowed; treated like one end_tag | ||
178 | */ | ||
179 | |||
180 | /* Get the length of the first resource template */ | ||
181 | |||
182 | status = acpi_ut_get_resource_end_tag(operand0, &end_tag); | ||
183 | if (ACPI_FAILURE(status)) { | ||
184 | return_ACPI_STATUS(status); | ||
185 | } | ||
186 | |||
187 | length0 = ACPI_PTR_DIFF(end_tag, operand0->buffer.pointer); | ||
188 | |||
189 | /* Get the length of the second resource template */ | ||
190 | |||
191 | status = acpi_ut_get_resource_end_tag(operand1, &end_tag); | ||
192 | if (ACPI_FAILURE(status)) { | ||
193 | return_ACPI_STATUS(status); | ||
194 | } | ||
195 | |||
196 | length1 = ACPI_PTR_DIFF(end_tag, operand1->buffer.pointer); | ||
197 | |||
198 | /* Combine both lengths, minimum size will be 2 for end_tag */ | ||
199 | |||
200 | new_length = length0 + length1 + sizeof(struct aml_resource_end_tag); | ||
201 | |||
202 | /* Create a new buffer object for the result (with one end_tag) */ | ||
203 | |||
204 | return_desc = acpi_ut_create_buffer_object(new_length); | ||
205 | if (!return_desc) { | ||
206 | return_ACPI_STATUS(AE_NO_MEMORY); | ||
207 | } | ||
208 | |||
209 | /* | ||
210 | * Copy the templates to the new buffer, 0 first, then 1 follows. One | ||
211 | * end_tag descriptor is copied from Operand1. | ||
212 | */ | ||
213 | new_buf = return_desc->buffer.pointer; | ||
214 | ACPI_MEMCPY(new_buf, operand0->buffer.pointer, length0); | ||
215 | ACPI_MEMCPY(new_buf + length0, operand1->buffer.pointer, length1); | ||
216 | |||
217 | /* Insert end_tag and set the checksum to zero, means "ignore checksum" */ | ||
218 | |||
219 | new_buf[new_length - 1] = 0; | ||
220 | new_buf[new_length - 2] = ACPI_RESOURCE_NAME_END_TAG | 1; | ||
221 | |||
222 | /* Return the completed resource template */ | ||
223 | |||
224 | *actual_return_desc = return_desc; | ||
225 | return_ACPI_STATUS(AE_OK); | ||
226 | } | ||
227 | |||
228 | /******************************************************************************* | ||
229 | * | ||
230 | * FUNCTION: acpi_ex_do_concatenate | ||
231 | * | ||
232 | * PARAMETERS: Operand0 - First source object | ||
233 | * Operand1 - Second source object | ||
234 | * actual_return_desc - Where to place the return object | ||
235 | * walk_state - Current walk state | ||
236 | * | ||
237 | * RETURN: Status | ||
238 | * | ||
239 | * DESCRIPTION: Concatenate two objects OF THE SAME TYPE. | ||
240 | * | ||
241 | ******************************************************************************/ | ||
242 | |||
243 | acpi_status | ||
244 | acpi_ex_do_concatenate(union acpi_operand_object *operand0, | ||
245 | union acpi_operand_object *operand1, | ||
246 | union acpi_operand_object **actual_return_desc, | ||
247 | struct acpi_walk_state *walk_state) | ||
248 | { | ||
249 | union acpi_operand_object *local_operand1 = operand1; | ||
250 | union acpi_operand_object *return_desc; | ||
251 | char *new_buf; | ||
252 | acpi_status status; | ||
253 | |||
254 | ACPI_FUNCTION_TRACE(ex_do_concatenate); | ||
255 | |||
256 | /* | ||
257 | * Convert the second operand if necessary. The first operand | ||
258 | * determines the type of the second operand, (See the Data Types | ||
259 | * section of the ACPI specification.) Both object types are | ||
260 | * guaranteed to be either Integer/String/Buffer by the operand | ||
261 | * resolution mechanism. | ||
262 | */ | ||
263 | switch (ACPI_GET_OBJECT_TYPE(operand0)) { | ||
264 | case ACPI_TYPE_INTEGER: | ||
265 | status = | ||
266 | acpi_ex_convert_to_integer(operand1, &local_operand1, 16); | ||
267 | break; | ||
268 | |||
269 | case ACPI_TYPE_STRING: | ||
270 | status = acpi_ex_convert_to_string(operand1, &local_operand1, | ||
271 | ACPI_IMPLICIT_CONVERT_HEX); | ||
272 | break; | ||
273 | |||
274 | case ACPI_TYPE_BUFFER: | ||
275 | status = acpi_ex_convert_to_buffer(operand1, &local_operand1); | ||
276 | break; | ||
277 | |||
278 | default: | ||
279 | ACPI_ERROR((AE_INFO, "Invalid object type: %X", | ||
280 | ACPI_GET_OBJECT_TYPE(operand0))); | ||
281 | status = AE_AML_INTERNAL; | ||
282 | } | ||
283 | |||
284 | if (ACPI_FAILURE(status)) { | ||
285 | goto cleanup; | ||
286 | } | ||
287 | |||
288 | /* | ||
289 | * Both operands are now known to be the same object type | ||
290 | * (Both are Integer, String, or Buffer), and we can now perform the | ||
291 | * concatenation. | ||
292 | */ | ||
293 | |||
294 | /* | ||
295 | * There are three cases to handle: | ||
296 | * | ||
297 | * 1) Two Integers concatenated to produce a new Buffer | ||
298 | * 2) Two Strings concatenated to produce a new String | ||
299 | * 3) Two Buffers concatenated to produce a new Buffer | ||
300 | */ | ||
301 | switch (ACPI_GET_OBJECT_TYPE(operand0)) { | ||
302 | case ACPI_TYPE_INTEGER: | ||
303 | |||
304 | /* Result of two Integers is a Buffer */ | ||
305 | /* Need enough buffer space for two integers */ | ||
306 | |||
307 | return_desc = acpi_ut_create_buffer_object((acpi_size) | ||
308 | ACPI_MUL_2 | ||
309 | (acpi_gbl_integer_byte_width)); | ||
310 | if (!return_desc) { | ||
311 | status = AE_NO_MEMORY; | ||
312 | goto cleanup; | ||
313 | } | ||
314 | |||
315 | new_buf = (char *)return_desc->buffer.pointer; | ||
316 | |||
317 | /* Copy the first integer, LSB first */ | ||
318 | |||
319 | ACPI_MEMCPY(new_buf, &operand0->integer.value, | ||
320 | acpi_gbl_integer_byte_width); | ||
321 | |||
322 | /* Copy the second integer (LSB first) after the first */ | ||
323 | |||
324 | ACPI_MEMCPY(new_buf + acpi_gbl_integer_byte_width, | ||
325 | &local_operand1->integer.value, | ||
326 | acpi_gbl_integer_byte_width); | ||
327 | break; | ||
328 | |||
329 | case ACPI_TYPE_STRING: | ||
330 | |||
331 | /* Result of two Strings is a String */ | ||
332 | |||
333 | return_desc = acpi_ut_create_string_object(((acpi_size) | ||
334 | operand0->string. | ||
335 | length + | ||
336 | local_operand1-> | ||
337 | string.length)); | ||
338 | if (!return_desc) { | ||
339 | status = AE_NO_MEMORY; | ||
340 | goto cleanup; | ||
341 | } | ||
342 | |||
343 | new_buf = return_desc->string.pointer; | ||
344 | |||
345 | /* Concatenate the strings */ | ||
346 | |||
347 | ACPI_STRCPY(new_buf, operand0->string.pointer); | ||
348 | ACPI_STRCPY(new_buf + operand0->string.length, | ||
349 | local_operand1->string.pointer); | ||
350 | break; | ||
351 | |||
352 | case ACPI_TYPE_BUFFER: | ||
353 | |||
354 | /* Result of two Buffers is a Buffer */ | ||
355 | |||
356 | return_desc = acpi_ut_create_buffer_object(((acpi_size) | ||
357 | operand0->buffer. | ||
358 | length + | ||
359 | local_operand1-> | ||
360 | 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, operand0->buffer.pointer, | ||
371 | operand0->buffer.length); | ||
372 | ACPI_MEMCPY(new_buf + operand0->buffer.length, | ||
373 | local_operand1->buffer.pointer, | ||
374 | local_operand1->buffer.length); | ||
375 | break; | ||
376 | |||
377 | default: | ||
378 | |||
379 | /* Invalid object type, should not happen here */ | ||
380 | |||
381 | ACPI_ERROR((AE_INFO, "Invalid object type: %X", | ||
382 | ACPI_GET_OBJECT_TYPE(operand0))); | ||
383 | status = AE_AML_INTERNAL; | ||
384 | goto cleanup; | ||
385 | } | ||
386 | |||
387 | *actual_return_desc = return_desc; | ||
388 | |||
389 | cleanup: | ||
390 | if (local_operand1 != operand1) { | ||
391 | acpi_ut_remove_reference(local_operand1); | ||
392 | } | ||
393 | return_ACPI_STATUS(status); | ||
394 | } | ||
395 | |||
396 | /******************************************************************************* | ||
397 | * | ||
398 | * FUNCTION: acpi_ex_do_math_op | ||
399 | * | ||
400 | * PARAMETERS: Opcode - AML opcode | ||
401 | * Integer0 - Integer operand #0 | ||
402 | * Integer1 - Integer operand #1 | ||
403 | * | ||
404 | * RETURN: Integer result of the operation | ||
405 | * | ||
406 | * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the | ||
407 | * math functions here is to prevent a lot of pointer dereferencing | ||
408 | * to obtain the operands. | ||
409 | * | ||
410 | ******************************************************************************/ | ||
411 | |||
412 | acpi_integer | ||
413 | acpi_ex_do_math_op(u16 opcode, acpi_integer integer0, acpi_integer integer1) | ||
414 | { | ||
415 | |||
416 | ACPI_FUNCTION_ENTRY(); | ||
417 | |||
418 | switch (opcode) { | ||
419 | case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */ | ||
420 | |||
421 | return (integer0 + integer1); | ||
422 | |||
423 | case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */ | ||
424 | |||
425 | return (integer0 & integer1); | ||
426 | |||
427 | case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */ | ||
428 | |||
429 | return (~(integer0 & integer1)); | ||
430 | |||
431 | case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */ | ||
432 | |||
433 | return (integer0 | integer1); | ||
434 | |||
435 | case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */ | ||
436 | |||
437 | return (~(integer0 | integer1)); | ||
438 | |||
439 | case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */ | ||
440 | |||
441 | return (integer0 ^ integer1); | ||
442 | |||
443 | case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */ | ||
444 | |||
445 | return (integer0 * integer1); | ||
446 | |||
447 | case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result) */ | ||
448 | |||
449 | /* | ||
450 | * We need to check if the shiftcount is larger than the integer bit | ||
451 | * width since the behavior of this is not well-defined in the C language. | ||
452 | */ | ||
453 | if (integer1 >= acpi_gbl_integer_bit_width) { | ||
454 | return (0); | ||
455 | } | ||
456 | return (integer0 << integer1); | ||
457 | |||
458 | case AML_SHIFT_RIGHT_OP: /* shift_right (Operand, shift_count, Result) */ | ||
459 | |||
460 | /* | ||
461 | * We need to check if the shiftcount is larger than the integer bit | ||
462 | * width since the behavior of this is not well-defined in the C language. | ||
463 | */ | ||
464 | if (integer1 >= acpi_gbl_integer_bit_width) { | ||
465 | return (0); | ||
466 | } | ||
467 | return (integer0 >> integer1); | ||
468 | |||
469 | case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */ | ||
470 | |||
471 | return (integer0 - integer1); | ||
472 | |||
473 | default: | ||
474 | |||
475 | return (0); | ||
476 | } | ||
477 | } | ||
478 | |||
479 | /******************************************************************************* | ||
480 | * | ||
481 | * FUNCTION: acpi_ex_do_logical_numeric_op | ||
482 | * | ||
483 | * PARAMETERS: Opcode - AML opcode | ||
484 | * Integer0 - Integer operand #0 | ||
485 | * Integer1 - Integer operand #1 | ||
486 | * logical_result - TRUE/FALSE result of the operation | ||
487 | * | ||
488 | * RETURN: Status | ||
489 | * | ||
490 | * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric | ||
491 | * operators (LAnd and LOr), both operands must be integers. | ||
492 | * | ||
493 | * Note: cleanest machine code seems to be produced by the code | ||
494 | * below, rather than using statements of the form: | ||
495 | * Result = (Integer0 && Integer1); | ||
496 | * | ||
497 | ******************************************************************************/ | ||
498 | |||
499 | acpi_status | ||
500 | acpi_ex_do_logical_numeric_op(u16 opcode, | ||
501 | acpi_integer integer0, | ||
502 | acpi_integer 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 | status = AE_AML_INTERNAL; | ||
526 | break; | ||
527 | } | ||
528 | |||
529 | /* Return the logical result and status */ | ||
530 | |||
531 | *logical_result = local_result; | ||
532 | return_ACPI_STATUS(status); | ||
533 | } | ||
534 | |||
535 | /******************************************************************************* | ||
536 | * | ||
537 | * FUNCTION: acpi_ex_do_logical_op | ||
538 | * | ||
539 | * PARAMETERS: Opcode - AML opcode | ||
540 | * Operand0 - operand #0 | ||
541 | * Operand1 - operand #1 | ||
542 | * logical_result - TRUE/FALSE result of the operation | ||
543 | * | ||
544 | * RETURN: Status | ||
545 | * | ||
546 | * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the | ||
547 | * functions here is to prevent a lot of pointer dereferencing | ||
548 | * to obtain the operands and to simplify the generation of the | ||
549 | * logical value. For the Numeric operators (LAnd and LOr), both | ||
550 | * operands must be integers. For the other logical operators, | ||
551 | * operands can be any combination of Integer/String/Buffer. The | ||
552 | * first operand determines the type to which the second operand | ||
553 | * will be converted. | ||
554 | * | ||
555 | * Note: cleanest machine code seems to be produced by the code | ||
556 | * below, rather than using statements of the form: | ||
557 | * Result = (Operand0 == Operand1); | ||
558 | * | ||
559 | ******************************************************************************/ | ||
560 | |||
561 | acpi_status | ||
562 | acpi_ex_do_logical_op(u16 opcode, | ||
563 | union acpi_operand_object *operand0, | ||
564 | union acpi_operand_object *operand1, u8 * logical_result) | ||
565 | { | ||
566 | union acpi_operand_object *local_operand1 = operand1; | ||
567 | acpi_integer integer0; | ||
568 | acpi_integer integer1; | ||
569 | u32 length0; | ||
570 | u32 length1; | ||
571 | acpi_status status = AE_OK; | ||
572 | u8 local_result = FALSE; | ||
573 | int compare; | ||
574 | |||
575 | ACPI_FUNCTION_TRACE(ex_do_logical_op); | ||
576 | |||
577 | /* | ||
578 | * Convert the second operand if necessary. The first operand | ||
579 | * determines the type of the second operand, (See the Data Types | ||
580 | * section of the ACPI 3.0+ specification.) Both object types are | ||
581 | * guaranteed to be either Integer/String/Buffer by the operand | ||
582 | * resolution mechanism. | ||
583 | */ | ||
584 | switch (ACPI_GET_OBJECT_TYPE(operand0)) { | ||
585 | case ACPI_TYPE_INTEGER: | ||
586 | status = | ||
587 | acpi_ex_convert_to_integer(operand1, &local_operand1, 16); | ||
588 | break; | ||
589 | |||
590 | case ACPI_TYPE_STRING: | ||
591 | status = acpi_ex_convert_to_string(operand1, &local_operand1, | ||
592 | ACPI_IMPLICIT_CONVERT_HEX); | ||
593 | break; | ||
594 | |||
595 | case ACPI_TYPE_BUFFER: | ||
596 | status = acpi_ex_convert_to_buffer(operand1, &local_operand1); | ||
597 | break; | ||
598 | |||
599 | default: | ||
600 | status = AE_AML_INTERNAL; | ||
601 | break; | ||
602 | } | ||
603 | |||
604 | if (ACPI_FAILURE(status)) { | ||
605 | goto cleanup; | ||
606 | } | ||
607 | |||
608 | /* | ||
609 | * Two cases: 1) Both Integers, 2) Both Strings or Buffers | ||
610 | */ | ||
611 | if (ACPI_GET_OBJECT_TYPE(operand0) == ACPI_TYPE_INTEGER) { | ||
612 | /* | ||
613 | * 1) Both operands are of type integer | ||
614 | * Note: local_operand1 may have changed above | ||
615 | */ | ||
616 | integer0 = operand0->integer.value; | ||
617 | integer1 = local_operand1->integer.value; | ||
618 | |||
619 | switch (opcode) { | ||
620 | case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ | ||
621 | |||
622 | if (integer0 == integer1) { | ||
623 | local_result = TRUE; | ||
624 | } | ||
625 | break; | ||
626 | |||
627 | case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ | ||
628 | |||
629 | if (integer0 > integer1) { | ||
630 | local_result = TRUE; | ||
631 | } | ||
632 | break; | ||
633 | |||
634 | case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ | ||
635 | |||
636 | if (integer0 < integer1) { | ||
637 | local_result = TRUE; | ||
638 | } | ||
639 | break; | ||
640 | |||
641 | default: | ||
642 | status = AE_AML_INTERNAL; | ||
643 | break; | ||
644 | } | ||
645 | } else { | ||
646 | /* | ||
647 | * 2) Both operands are Strings or both are Buffers | ||
648 | * Note: Code below takes advantage of common Buffer/String | ||
649 | * object fields. local_operand1 may have changed above. Use | ||
650 | * memcmp to handle nulls in buffers. | ||
651 | */ | ||
652 | length0 = operand0->buffer.length; | ||
653 | length1 = local_operand1->buffer.length; | ||
654 | |||
655 | /* Lexicographic compare: compare the data bytes */ | ||
656 | |||
657 | compare = ACPI_MEMCMP(operand0->buffer.pointer, | ||
658 | local_operand1->buffer.pointer, | ||
659 | (length0 > length1) ? length1 : length0); | ||
660 | |||
661 | switch (opcode) { | ||
662 | case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ | ||
663 | |||
664 | /* Length and all bytes must be equal */ | ||
665 | |||
666 | if ((length0 == length1) && (compare == 0)) { | ||
667 | |||
668 | /* Length and all bytes match ==> TRUE */ | ||
669 | |||
670 | local_result = TRUE; | ||
671 | } | ||
672 | break; | ||
673 | |||
674 | case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ | ||
675 | |||
676 | if (compare > 0) { | ||
677 | local_result = TRUE; | ||
678 | goto cleanup; /* TRUE */ | ||
679 | } | ||
680 | if (compare < 0) { | ||
681 | goto cleanup; /* FALSE */ | ||
682 | } | ||
683 | |||
684 | /* Bytes match (to shortest length), compare lengths */ | ||
685 | |||
686 | if (length0 > length1) { | ||
687 | local_result = TRUE; | ||
688 | } | ||
689 | break; | ||
690 | |||
691 | case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ | ||
692 | |||
693 | if (compare > 0) { | ||
694 | goto cleanup; /* FALSE */ | ||
695 | } | ||
696 | if (compare < 0) { | ||
697 | local_result = TRUE; | ||
698 | goto cleanup; /* TRUE */ | ||
699 | } | ||
700 | |||
701 | /* Bytes match (to shortest length), compare lengths */ | ||
702 | |||
703 | if (length0 < length1) { | ||
704 | local_result = TRUE; | ||
705 | } | ||
706 | break; | ||
707 | |||
708 | default: | ||
709 | status = AE_AML_INTERNAL; | ||
710 | break; | ||
711 | } | ||
712 | } | ||
713 | |||
714 | cleanup: | ||
715 | |||
716 | /* New object was created if implicit conversion performed - delete */ | ||
717 | |||
718 | if (local_operand1 != operand1) { | ||
719 | acpi_ut_remove_reference(local_operand1); | ||
720 | } | ||
721 | |||
722 | /* Return the logical result and status */ | ||
723 | |||
724 | *logical_result = local_result; | ||
725 | return_ACPI_STATUS(status); | ||
726 | } | ||