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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 | ||
1da177e4 LT |
45 | #include <acpi/acpi.h> |
46 | #include <acpi/acinterp.h> | |
47 | #include <acpi/amlcode.h> | |
48 | ||
1da177e4 | 49 | #define _COMPONENT ACPI_EXECUTER |
4be44fcd | 50 | ACPI_MODULE_NAME("exmisc") |
1da177e4 LT |
51 | |
52 | /******************************************************************************* | |
53 | * | |
54 | * FUNCTION: acpi_ex_get_object_reference | |
55 | * | |
56 | * PARAMETERS: obj_desc - Create a reference to this object | |
57 | * return_desc - Where to store the reference | |
58 | * walk_state - Current state | |
59 | * | |
60 | * RETURN: Status | |
61 | * | |
62 | * DESCRIPTION: Obtain and return a "reference" to the target object | |
63 | * Common code for the ref_of_op and the cond_ref_of_op. | |
64 | * | |
65 | ******************************************************************************/ | |
1da177e4 | 66 | acpi_status |
4be44fcd LB |
67 | acpi_ex_get_object_reference(union acpi_operand_object *obj_desc, |
68 | union acpi_operand_object **return_desc, | |
69 | struct acpi_walk_state *walk_state) | |
1da177e4 | 70 | { |
4be44fcd LB |
71 | union acpi_operand_object *reference_obj; |
72 | union acpi_operand_object *referenced_obj; | |
1da177e4 | 73 | |
4be44fcd | 74 | ACPI_FUNCTION_TRACE_PTR("ex_get_object_reference", obj_desc); |
1da177e4 LT |
75 | |
76 | *return_desc = NULL; | |
77 | ||
4be44fcd | 78 | switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) { |
1da177e4 LT |
79 | case ACPI_DESC_TYPE_OPERAND: |
80 | ||
4be44fcd LB |
81 | if (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_LOCAL_REFERENCE) { |
82 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); | |
1da177e4 LT |
83 | } |
84 | ||
85 | /* | |
86 | * Must be a reference to a Local or Arg | |
87 | */ | |
88 | switch (obj_desc->reference.opcode) { | |
89 | case AML_LOCAL_OP: | |
90 | case AML_ARG_OP: | |
91 | case AML_DEBUG_OP: | |
92 | ||
93 | /* The referenced object is the pseudo-node for the local/arg */ | |
94 | ||
95 | referenced_obj = obj_desc->reference.object; | |
96 | break; | |
97 | ||
98 | default: | |
99 | ||
4be44fcd LB |
100 | ACPI_REPORT_ERROR(("Unknown Reference opcode in get_reference %X\n", obj_desc->reference.opcode)); |
101 | return_ACPI_STATUS(AE_AML_INTERNAL); | |
1da177e4 LT |
102 | } |
103 | break; | |
104 | ||
1da177e4 LT |
105 | case ACPI_DESC_TYPE_NAMED: |
106 | ||
107 | /* | |
108 | * A named reference that has already been resolved to a Node | |
109 | */ | |
110 | referenced_obj = obj_desc; | |
111 | break; | |
112 | ||
1da177e4 LT |
113 | default: |
114 | ||
4be44fcd LB |
115 | ACPI_REPORT_ERROR(("Invalid descriptor type in get_reference: %X\n", ACPI_GET_DESCRIPTOR_TYPE(obj_desc))); |
116 | return_ACPI_STATUS(AE_TYPE); | |
1da177e4 LT |
117 | } |
118 | ||
1da177e4 LT |
119 | /* Create a new reference object */ |
120 | ||
4be44fcd LB |
121 | reference_obj = |
122 | acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE); | |
1da177e4 | 123 | if (!reference_obj) { |
4be44fcd | 124 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
125 | } |
126 | ||
127 | reference_obj->reference.opcode = AML_REF_OF_OP; | |
128 | reference_obj->reference.object = referenced_obj; | |
129 | *return_desc = reference_obj; | |
130 | ||
4be44fcd LB |
131 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
132 | "Object %p Type [%s], returning Reference %p\n", | |
133 | obj_desc, acpi_ut_get_object_type_name(obj_desc), | |
134 | *return_desc)); | |
1da177e4 | 135 | |
4be44fcd | 136 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
137 | } |
138 | ||
1da177e4 LT |
139 | /******************************************************************************* |
140 | * | |
141 | * FUNCTION: acpi_ex_concat_template | |
142 | * | |
143 | * PARAMETERS: Operand0 - First source object | |
144 | * Operand1 - Second source object | |
145 | * actual_return_desc - Where to place the return object | |
146 | * walk_state - Current walk state | |
147 | * | |
148 | * RETURN: Status | |
149 | * | |
150 | * DESCRIPTION: Concatenate two resource templates | |
151 | * | |
152 | ******************************************************************************/ | |
153 | ||
154 | acpi_status | |
4be44fcd LB |
155 | acpi_ex_concat_template(union acpi_operand_object *operand0, |
156 | union acpi_operand_object *operand1, | |
157 | union acpi_operand_object **actual_return_desc, | |
158 | struct acpi_walk_state *walk_state) | |
1da177e4 | 159 | { |
4be44fcd LB |
160 | union acpi_operand_object *return_desc; |
161 | u8 *new_buf; | |
162 | u8 *end_tag1; | |
163 | u8 *end_tag2; | |
164 | acpi_size length1; | |
165 | acpi_size length2; | |
1da177e4 | 166 | |
4be44fcd | 167 | ACPI_FUNCTION_TRACE("ex_concat_template"); |
1da177e4 LT |
168 | |
169 | /* Find the end_tags in each resource template */ | |
170 | ||
4be44fcd LB |
171 | end_tag1 = acpi_ut_get_resource_end_tag(operand0); |
172 | end_tag2 = acpi_ut_get_resource_end_tag(operand1); | |
1da177e4 | 173 | if (!end_tag1 || !end_tag2) { |
4be44fcd | 174 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 LT |
175 | } |
176 | ||
177 | /* Compute the length of each part */ | |
178 | ||
4be44fcd LB |
179 | length1 = ACPI_PTR_DIFF(end_tag1, operand0->buffer.pointer); |
180 | length2 = ACPI_PTR_DIFF(end_tag2, operand1->buffer.pointer) + 2; /* Size of END_TAG */ | |
1da177e4 LT |
181 | |
182 | /* Create a new buffer object for the result */ | |
183 | ||
4be44fcd | 184 | return_desc = acpi_ut_create_buffer_object(length1 + length2); |
1da177e4 | 185 | if (!return_desc) { |
4be44fcd | 186 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
187 | } |
188 | ||
189 | /* Copy the templates to the new descriptor */ | |
190 | ||
191 | new_buf = return_desc->buffer.pointer; | |
4be44fcd LB |
192 | ACPI_MEMCPY(new_buf, operand0->buffer.pointer, length1); |
193 | ACPI_MEMCPY(new_buf + length1, operand1->buffer.pointer, length2); | |
1da177e4 LT |
194 | |
195 | /* Compute the new checksum */ | |
196 | ||
197 | new_buf[return_desc->buffer.length - 1] = | |
4be44fcd LB |
198 | acpi_ut_generate_checksum(return_desc->buffer.pointer, |
199 | (return_desc->buffer.length - 1)); | |
1da177e4 LT |
200 | |
201 | /* Return the completed template descriptor */ | |
202 | ||
203 | *actual_return_desc = return_desc; | |
4be44fcd | 204 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
205 | } |
206 | ||
1da177e4 LT |
207 | /******************************************************************************* |
208 | * | |
209 | * FUNCTION: acpi_ex_do_concatenate | |
210 | * | |
211 | * PARAMETERS: Operand0 - First source object | |
212 | * Operand1 - Second source object | |
213 | * actual_return_desc - Where to place the return object | |
214 | * walk_state - Current walk state | |
215 | * | |
216 | * RETURN: Status | |
217 | * | |
218 | * DESCRIPTION: Concatenate two objects OF THE SAME TYPE. | |
219 | * | |
220 | ******************************************************************************/ | |
221 | ||
222 | acpi_status | |
4be44fcd LB |
223 | acpi_ex_do_concatenate(union acpi_operand_object *operand0, |
224 | union acpi_operand_object *operand1, | |
225 | union acpi_operand_object **actual_return_desc, | |
226 | struct acpi_walk_state *walk_state) | |
1da177e4 | 227 | { |
4be44fcd LB |
228 | union acpi_operand_object *local_operand1 = operand1; |
229 | union acpi_operand_object *return_desc; | |
230 | char *new_buf; | |
231 | acpi_status status; | |
232 | acpi_size new_length; | |
1da177e4 | 233 | |
4be44fcd | 234 | ACPI_FUNCTION_TRACE("ex_do_concatenate"); |
1da177e4 LT |
235 | |
236 | /* | |
237 | * Convert the second operand if necessary. The first operand | |
238 | * determines the type of the second operand, (See the Data Types | |
239 | * section of the ACPI specification.) Both object types are | |
240 | * guaranteed to be either Integer/String/Buffer by the operand | |
241 | * resolution mechanism. | |
242 | */ | |
4be44fcd | 243 | switch (ACPI_GET_OBJECT_TYPE(operand0)) { |
1da177e4 | 244 | case ACPI_TYPE_INTEGER: |
4be44fcd LB |
245 | status = |
246 | acpi_ex_convert_to_integer(operand1, &local_operand1, 16); | |
1da177e4 LT |
247 | break; |
248 | ||
249 | case ACPI_TYPE_STRING: | |
4be44fcd LB |
250 | status = acpi_ex_convert_to_string(operand1, &local_operand1, |
251 | ACPI_IMPLICIT_CONVERT_HEX); | |
1da177e4 LT |
252 | break; |
253 | ||
254 | case ACPI_TYPE_BUFFER: | |
4be44fcd | 255 | status = acpi_ex_convert_to_buffer(operand1, &local_operand1); |
1da177e4 LT |
256 | break; |
257 | ||
258 | default: | |
4be44fcd LB |
259 | ACPI_REPORT_ERROR(("Concat - invalid obj type: %X\n", |
260 | ACPI_GET_OBJECT_TYPE(operand0))); | |
1da177e4 LT |
261 | status = AE_AML_INTERNAL; |
262 | } | |
263 | ||
4be44fcd | 264 | if (ACPI_FAILURE(status)) { |
1da177e4 LT |
265 | goto cleanup; |
266 | } | |
267 | ||
268 | /* | |
269 | * Both operands are now known to be the same object type | |
270 | * (Both are Integer, String, or Buffer), and we can now perform the | |
271 | * concatenation. | |
272 | */ | |
273 | ||
274 | /* | |
275 | * There are three cases to handle: | |
276 | * | |
277 | * 1) Two Integers concatenated to produce a new Buffer | |
278 | * 2) Two Strings concatenated to produce a new String | |
279 | * 3) Two Buffers concatenated to produce a new Buffer | |
280 | */ | |
4be44fcd | 281 | switch (ACPI_GET_OBJECT_TYPE(operand0)) { |
1da177e4 LT |
282 | case ACPI_TYPE_INTEGER: |
283 | ||
284 | /* Result of two Integers is a Buffer */ | |
285 | /* Need enough buffer space for two integers */ | |
286 | ||
4be44fcd LB |
287 | return_desc = acpi_ut_create_buffer_object((acpi_size) |
288 | ACPI_MUL_2 | |
289 | (acpi_gbl_integer_byte_width)); | |
1da177e4 LT |
290 | if (!return_desc) { |
291 | status = AE_NO_MEMORY; | |
292 | goto cleanup; | |
293 | } | |
294 | ||
4be44fcd | 295 | new_buf = (char *)return_desc->buffer.pointer; |
1da177e4 LT |
296 | |
297 | /* Copy the first integer, LSB first */ | |
298 | ||
4be44fcd LB |
299 | ACPI_MEMCPY(new_buf, |
300 | &operand0->integer.value, | |
301 | acpi_gbl_integer_byte_width); | |
1da177e4 LT |
302 | |
303 | /* Copy the second integer (LSB first) after the first */ | |
304 | ||
4be44fcd LB |
305 | ACPI_MEMCPY(new_buf + acpi_gbl_integer_byte_width, |
306 | &local_operand1->integer.value, | |
307 | acpi_gbl_integer_byte_width); | |
1da177e4 LT |
308 | break; |
309 | ||
310 | case ACPI_TYPE_STRING: | |
311 | ||
312 | /* Result of two Strings is a String */ | |
313 | ||
314 | new_length = (acpi_size) operand0->string.length + | |
4be44fcd | 315 | (acpi_size) local_operand1->string.length; |
1da177e4 LT |
316 | if (new_length > ACPI_MAX_STRING_CONVERSION) { |
317 | status = AE_AML_STRING_LIMIT; | |
318 | goto cleanup; | |
319 | } | |
320 | ||
4be44fcd | 321 | return_desc = acpi_ut_create_string_object(new_length); |
1da177e4 LT |
322 | if (!return_desc) { |
323 | status = AE_NO_MEMORY; | |
324 | goto cleanup; | |
325 | } | |
326 | ||
327 | new_buf = return_desc->string.pointer; | |
328 | ||
329 | /* Concatenate the strings */ | |
330 | ||
4be44fcd LB |
331 | ACPI_STRCPY(new_buf, operand0->string.pointer); |
332 | ACPI_STRCPY(new_buf + operand0->string.length, | |
333 | local_operand1->string.pointer); | |
1da177e4 LT |
334 | break; |
335 | ||
336 | case ACPI_TYPE_BUFFER: | |
337 | ||
338 | /* Result of two Buffers is a Buffer */ | |
339 | ||
4be44fcd LB |
340 | return_desc = acpi_ut_create_buffer_object((acpi_size) |
341 | operand0->buffer. | |
342 | length + | |
343 | (acpi_size) | |
344 | local_operand1-> | |
345 | buffer.length); | |
1da177e4 LT |
346 | if (!return_desc) { |
347 | status = AE_NO_MEMORY; | |
348 | goto cleanup; | |
349 | } | |
350 | ||
4be44fcd | 351 | new_buf = (char *)return_desc->buffer.pointer; |
1da177e4 LT |
352 | |
353 | /* Concatenate the buffers */ | |
354 | ||
4be44fcd LB |
355 | ACPI_MEMCPY(new_buf, |
356 | operand0->buffer.pointer, operand0->buffer.length); | |
357 | ACPI_MEMCPY(new_buf + operand0->buffer.length, | |
358 | local_operand1->buffer.pointer, | |
359 | local_operand1->buffer.length); | |
1da177e4 LT |
360 | break; |
361 | ||
362 | default: | |
363 | ||
364 | /* Invalid object type, should not happen here */ | |
365 | ||
4be44fcd LB |
366 | ACPI_REPORT_ERROR(("Concatenate - Invalid object type: %X\n", |
367 | ACPI_GET_OBJECT_TYPE(operand0))); | |
368 | status = AE_AML_INTERNAL; | |
1da177e4 LT |
369 | goto cleanup; |
370 | } | |
371 | ||
372 | *actual_return_desc = return_desc; | |
373 | ||
4be44fcd | 374 | cleanup: |
1da177e4 | 375 | if (local_operand1 != operand1) { |
4be44fcd | 376 | acpi_ut_remove_reference(local_operand1); |
1da177e4 | 377 | } |
4be44fcd | 378 | return_ACPI_STATUS(status); |
1da177e4 LT |
379 | } |
380 | ||
1da177e4 LT |
381 | /******************************************************************************* |
382 | * | |
383 | * FUNCTION: acpi_ex_do_math_op | |
384 | * | |
385 | * PARAMETERS: Opcode - AML opcode | |
386 | * Integer0 - Integer operand #0 | |
387 | * Integer1 - Integer operand #1 | |
388 | * | |
389 | * RETURN: Integer result of the operation | |
390 | * | |
391 | * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the | |
392 | * math functions here is to prevent a lot of pointer dereferencing | |
393 | * to obtain the operands. | |
394 | * | |
395 | ******************************************************************************/ | |
396 | ||
397 | acpi_integer | |
4be44fcd | 398 | acpi_ex_do_math_op(u16 opcode, acpi_integer integer0, acpi_integer integer1) |
1da177e4 LT |
399 | { |
400 | ||
4be44fcd | 401 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
402 | |
403 | switch (opcode) { | |
4be44fcd | 404 | case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */ |
1da177e4 LT |
405 | |
406 | return (integer0 + integer1); | |
407 | ||
4be44fcd | 408 | case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */ |
1da177e4 LT |
409 | |
410 | return (integer0 & integer1); | |
411 | ||
4be44fcd | 412 | case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */ |
1da177e4 LT |
413 | |
414 | return (~(integer0 & integer1)); | |
415 | ||
4be44fcd | 416 | case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */ |
1da177e4 LT |
417 | |
418 | return (integer0 | integer1); | |
419 | ||
4be44fcd | 420 | case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */ |
1da177e4 LT |
421 | |
422 | return (~(integer0 | integer1)); | |
423 | ||
4be44fcd | 424 | case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */ |
1da177e4 LT |
425 | |
426 | return (integer0 ^ integer1); | |
427 | ||
4be44fcd | 428 | case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */ |
1da177e4 LT |
429 | |
430 | return (integer0 * integer1); | |
431 | ||
4be44fcd | 432 | case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result) */ |
1da177e4 LT |
433 | |
434 | return (integer0 << integer1); | |
435 | ||
4be44fcd | 436 | case AML_SHIFT_RIGHT_OP: /* shift_right (Operand, shift_count, Result) */ |
1da177e4 LT |
437 | |
438 | return (integer0 >> integer1); | |
439 | ||
4be44fcd | 440 | case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */ |
1da177e4 LT |
441 | |
442 | return (integer0 - integer1); | |
443 | ||
444 | default: | |
445 | ||
446 | return (0); | |
447 | } | |
448 | } | |
449 | ||
1da177e4 LT |
450 | /******************************************************************************* |
451 | * | |
452 | * FUNCTION: acpi_ex_do_logical_numeric_op | |
453 | * | |
454 | * PARAMETERS: Opcode - AML opcode | |
455 | * Integer0 - Integer operand #0 | |
456 | * Integer1 - Integer operand #1 | |
457 | * logical_result - TRUE/FALSE result of the operation | |
458 | * | |
459 | * RETURN: Status | |
460 | * | |
461 | * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric | |
462 | * operators (LAnd and LOr), both operands must be integers. | |
463 | * | |
464 | * Note: cleanest machine code seems to be produced by the code | |
465 | * below, rather than using statements of the form: | |
466 | * Result = (Integer0 && Integer1); | |
467 | * | |
468 | ******************************************************************************/ | |
469 | ||
470 | acpi_status | |
4be44fcd LB |
471 | acpi_ex_do_logical_numeric_op(u16 opcode, |
472 | acpi_integer integer0, | |
473 | acpi_integer integer1, u8 * logical_result) | |
1da177e4 | 474 | { |
4be44fcd LB |
475 | acpi_status status = AE_OK; |
476 | u8 local_result = FALSE; | |
1da177e4 | 477 | |
4be44fcd | 478 | ACPI_FUNCTION_TRACE("ex_do_logical_numeric_op"); |
1da177e4 LT |
479 | |
480 | switch (opcode) { | |
4be44fcd | 481 | case AML_LAND_OP: /* LAnd (Integer0, Integer1) */ |
1da177e4 LT |
482 | |
483 | if (integer0 && integer1) { | |
484 | local_result = TRUE; | |
485 | } | |
486 | break; | |
487 | ||
4be44fcd | 488 | case AML_LOR_OP: /* LOr (Integer0, Integer1) */ |
1da177e4 LT |
489 | |
490 | if (integer0 || integer1) { | |
491 | local_result = TRUE; | |
492 | } | |
493 | break; | |
494 | ||
495 | default: | |
496 | status = AE_AML_INTERNAL; | |
497 | break; | |
498 | } | |
499 | ||
500 | /* Return the logical result and status */ | |
501 | ||
502 | *logical_result = local_result; | |
4be44fcd | 503 | return_ACPI_STATUS(status); |
1da177e4 LT |
504 | } |
505 | ||
1da177e4 LT |
506 | /******************************************************************************* |
507 | * | |
508 | * FUNCTION: acpi_ex_do_logical_op | |
509 | * | |
510 | * PARAMETERS: Opcode - AML opcode | |
511 | * Operand0 - operand #0 | |
512 | * Operand1 - operand #1 | |
513 | * logical_result - TRUE/FALSE result of the operation | |
514 | * | |
515 | * RETURN: Status | |
516 | * | |
517 | * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the | |
518 | * functions here is to prevent a lot of pointer dereferencing | |
519 | * to obtain the operands and to simplify the generation of the | |
520 | * logical value. For the Numeric operators (LAnd and LOr), both | |
521 | * operands must be integers. For the other logical operators, | |
522 | * operands can be any combination of Integer/String/Buffer. The | |
523 | * first operand determines the type to which the second operand | |
524 | * will be converted. | |
525 | * | |
526 | * Note: cleanest machine code seems to be produced by the code | |
527 | * below, rather than using statements of the form: | |
528 | * Result = (Operand0 == Operand1); | |
529 | * | |
530 | ******************************************************************************/ | |
531 | ||
532 | acpi_status | |
4be44fcd LB |
533 | acpi_ex_do_logical_op(u16 opcode, |
534 | union acpi_operand_object *operand0, | |
535 | union acpi_operand_object *operand1, u8 * logical_result) | |
1da177e4 | 536 | { |
4be44fcd LB |
537 | union acpi_operand_object *local_operand1 = operand1; |
538 | acpi_integer integer0; | |
539 | acpi_integer integer1; | |
540 | u32 length0; | |
541 | u32 length1; | |
542 | acpi_status status = AE_OK; | |
543 | u8 local_result = FALSE; | |
544 | int compare; | |
1da177e4 | 545 | |
4be44fcd | 546 | ACPI_FUNCTION_TRACE("ex_do_logical_op"); |
1da177e4 LT |
547 | |
548 | /* | |
549 | * Convert the second operand if necessary. The first operand | |
550 | * determines the type of the second operand, (See the Data Types | |
551 | * section of the ACPI 3.0+ specification.) Both object types are | |
552 | * guaranteed to be either Integer/String/Buffer by the operand | |
553 | * resolution mechanism. | |
554 | */ | |
4be44fcd | 555 | switch (ACPI_GET_OBJECT_TYPE(operand0)) { |
1da177e4 | 556 | case ACPI_TYPE_INTEGER: |
4be44fcd LB |
557 | status = |
558 | acpi_ex_convert_to_integer(operand1, &local_operand1, 16); | |
1da177e4 LT |
559 | break; |
560 | ||
561 | case ACPI_TYPE_STRING: | |
4be44fcd LB |
562 | status = acpi_ex_convert_to_string(operand1, &local_operand1, |
563 | ACPI_IMPLICIT_CONVERT_HEX); | |
1da177e4 LT |
564 | break; |
565 | ||
566 | case ACPI_TYPE_BUFFER: | |
4be44fcd | 567 | status = acpi_ex_convert_to_buffer(operand1, &local_operand1); |
1da177e4 LT |
568 | break; |
569 | ||
570 | default: | |
571 | status = AE_AML_INTERNAL; | |
572 | break; | |
573 | } | |
574 | ||
4be44fcd | 575 | if (ACPI_FAILURE(status)) { |
1da177e4 LT |
576 | goto cleanup; |
577 | } | |
578 | ||
579 | /* | |
580 | * Two cases: 1) Both Integers, 2) Both Strings or Buffers | |
581 | */ | |
4be44fcd | 582 | if (ACPI_GET_OBJECT_TYPE(operand0) == ACPI_TYPE_INTEGER) { |
1da177e4 LT |
583 | /* |
584 | * 1) Both operands are of type integer | |
585 | * Note: local_operand1 may have changed above | |
586 | */ | |
587 | integer0 = operand0->integer.value; | |
588 | integer1 = local_operand1->integer.value; | |
589 | ||
590 | switch (opcode) { | |
4be44fcd | 591 | case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ |
1da177e4 LT |
592 | |
593 | if (integer0 == integer1) { | |
594 | local_result = TRUE; | |
595 | } | |
596 | break; | |
597 | ||
4be44fcd | 598 | case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ |
1da177e4 LT |
599 | |
600 | if (integer0 > integer1) { | |
601 | local_result = TRUE; | |
602 | } | |
603 | break; | |
604 | ||
4be44fcd | 605 | case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ |
1da177e4 LT |
606 | |
607 | if (integer0 < integer1) { | |
608 | local_result = TRUE; | |
609 | } | |
610 | break; | |
611 | ||
612 | default: | |
613 | status = AE_AML_INTERNAL; | |
614 | break; | |
615 | } | |
4be44fcd | 616 | } else { |
1da177e4 LT |
617 | /* |
618 | * 2) Both operands are Strings or both are Buffers | |
619 | * Note: Code below takes advantage of common Buffer/String | |
620 | * object fields. local_operand1 may have changed above. Use | |
621 | * memcmp to handle nulls in buffers. | |
622 | */ | |
623 | length0 = operand0->buffer.length; | |
624 | length1 = local_operand1->buffer.length; | |
625 | ||
626 | /* Lexicographic compare: compare the data bytes */ | |
627 | ||
4be44fcd LB |
628 | compare = ACPI_MEMCMP((const char *)operand0->buffer.pointer, |
629 | (const char *)local_operand1->buffer. | |
630 | pointer, | |
631 | (length0 > length1) ? length1 : length0); | |
1da177e4 LT |
632 | |
633 | switch (opcode) { | |
4be44fcd | 634 | case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ |
1da177e4 LT |
635 | |
636 | /* Length and all bytes must be equal */ | |
637 | ||
4be44fcd | 638 | if ((length0 == length1) && (compare == 0)) { |
1da177e4 LT |
639 | /* Length and all bytes match ==> TRUE */ |
640 | ||
641 | local_result = TRUE; | |
642 | } | |
643 | break; | |
644 | ||
4be44fcd | 645 | case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ |
1da177e4 LT |
646 | |
647 | if (compare > 0) { | |
648 | local_result = TRUE; | |
4be44fcd | 649 | goto cleanup; /* TRUE */ |
1da177e4 LT |
650 | } |
651 | if (compare < 0) { | |
4be44fcd | 652 | goto cleanup; /* FALSE */ |
1da177e4 LT |
653 | } |
654 | ||
655 | /* Bytes match (to shortest length), compare lengths */ | |
656 | ||
657 | if (length0 > length1) { | |
658 | local_result = TRUE; | |
659 | } | |
660 | break; | |
661 | ||
4be44fcd | 662 | case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ |
1da177e4 LT |
663 | |
664 | if (compare > 0) { | |
4be44fcd | 665 | goto cleanup; /* FALSE */ |
1da177e4 LT |
666 | } |
667 | if (compare < 0) { | |
668 | local_result = TRUE; | |
4be44fcd | 669 | goto cleanup; /* TRUE */ |
1da177e4 LT |
670 | } |
671 | ||
672 | /* Bytes match (to shortest length), compare lengths */ | |
673 | ||
674 | if (length0 < length1) { | |
675 | local_result = TRUE; | |
676 | } | |
677 | break; | |
678 | ||
679 | default: | |
680 | status = AE_AML_INTERNAL; | |
681 | break; | |
682 | } | |
683 | } | |
684 | ||
4be44fcd | 685 | cleanup: |
1da177e4 LT |
686 | |
687 | /* New object was created if implicit conversion performed - delete */ | |
688 | ||
689 | if (local_operand1 != operand1) { | |
4be44fcd | 690 | acpi_ut_remove_reference(local_operand1); |
1da177e4 LT |
691 | } |
692 | ||
693 | /* Return the logical result and status */ | |
694 | ||
695 | *logical_result = local_result; | |
4be44fcd | 696 | return_ACPI_STATUS(status); |
1da177e4 | 697 | } |