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1da177e4 LT |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
4a90c7e8 | 9 | * Copyright (C) 2000 - 2006, R. Byron Moore |
1da177e4 LT |
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> | |
96db255c | 48 | #include <acpi/amlresrc.h> |
1da177e4 | 49 | |
1da177e4 | 50 | #define _COMPONENT ACPI_EXECUTER |
4be44fcd | 51 | ACPI_MODULE_NAME("exmisc") |
1da177e4 LT |
52 | |
53 | /******************************************************************************* | |
54 | * | |
55 | * FUNCTION: acpi_ex_get_object_reference | |
56 | * | |
57 | * PARAMETERS: obj_desc - Create a reference to this object | |
58 | * return_desc - Where to store the reference | |
59 | * walk_state - Current state | |
60 | * | |
61 | * RETURN: Status | |
62 | * | |
63 | * DESCRIPTION: Obtain and return a "reference" to the target object | |
64 | * Common code for the ref_of_op and the cond_ref_of_op. | |
65 | * | |
66 | ******************************************************************************/ | |
1da177e4 | 67 | acpi_status |
4be44fcd LB |
68 | acpi_ex_get_object_reference(union acpi_operand_object *obj_desc, |
69 | union acpi_operand_object **return_desc, | |
70 | struct acpi_walk_state *walk_state) | |
1da177e4 | 71 | { |
4be44fcd LB |
72 | union acpi_operand_object *reference_obj; |
73 | union acpi_operand_object *referenced_obj; | |
1da177e4 | 74 | |
4be44fcd | 75 | ACPI_FUNCTION_TRACE_PTR("ex_get_object_reference", obj_desc); |
1da177e4 LT |
76 | |
77 | *return_desc = NULL; | |
78 | ||
4be44fcd | 79 | switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) { |
1da177e4 LT |
80 | case ACPI_DESC_TYPE_OPERAND: |
81 | ||
4be44fcd LB |
82 | if (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_LOCAL_REFERENCE) { |
83 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); | |
1da177e4 LT |
84 | } |
85 | ||
86 | /* | |
87 | * Must be a reference to a Local or Arg | |
88 | */ | |
89 | switch (obj_desc->reference.opcode) { | |
90 | case AML_LOCAL_OP: | |
91 | case AML_ARG_OP: | |
92 | case AML_DEBUG_OP: | |
93 | ||
94 | /* The referenced object is the pseudo-node for the local/arg */ | |
95 | ||
96 | referenced_obj = obj_desc->reference.object; | |
97 | break; | |
98 | ||
99 | default: | |
100 | ||
4a90c7e8 BM |
101 | ACPI_REPORT_ERROR(("Unknown Reference opcode %X\n", |
102 | obj_desc->reference.opcode)); | |
4be44fcd | 103 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
104 | } |
105 | break; | |
106 | ||
1da177e4 LT |
107 | case ACPI_DESC_TYPE_NAMED: |
108 | ||
109 | /* | |
110 | * A named reference that has already been resolved to a Node | |
111 | */ | |
112 | referenced_obj = obj_desc; | |
113 | break; | |
114 | ||
1da177e4 LT |
115 | default: |
116 | ||
4a90c7e8 BM |
117 | ACPI_REPORT_ERROR(("Invalid descriptor type %X\n", |
118 | ACPI_GET_DESCRIPTOR_TYPE(obj_desc))); | |
4be44fcd | 119 | return_ACPI_STATUS(AE_TYPE); |
1da177e4 LT |
120 | } |
121 | ||
1da177e4 LT |
122 | /* Create a new reference object */ |
123 | ||
4be44fcd LB |
124 | reference_obj = |
125 | acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE); | |
1da177e4 | 126 | if (!reference_obj) { |
4be44fcd | 127 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
128 | } |
129 | ||
130 | reference_obj->reference.opcode = AML_REF_OF_OP; | |
131 | reference_obj->reference.object = referenced_obj; | |
132 | *return_desc = reference_obj; | |
133 | ||
4be44fcd LB |
134 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
135 | "Object %p Type [%s], returning Reference %p\n", | |
136 | obj_desc, acpi_ut_get_object_type_name(obj_desc), | |
137 | *return_desc)); | |
1da177e4 | 138 | |
4be44fcd | 139 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
140 | } |
141 | ||
1da177e4 LT |
142 | /******************************************************************************* |
143 | * | |
144 | * FUNCTION: acpi_ex_concat_template | |
145 | * | |
146 | * PARAMETERS: Operand0 - First source object | |
147 | * Operand1 - Second source object | |
148 | * actual_return_desc - Where to place the return object | |
149 | * walk_state - Current walk state | |
150 | * | |
151 | * RETURN: Status | |
152 | * | |
153 | * DESCRIPTION: Concatenate two resource templates | |
154 | * | |
155 | ******************************************************************************/ | |
156 | ||
157 | acpi_status | |
4be44fcd LB |
158 | acpi_ex_concat_template(union acpi_operand_object *operand0, |
159 | union acpi_operand_object *operand1, | |
160 | union acpi_operand_object **actual_return_desc, | |
161 | struct acpi_walk_state *walk_state) | |
1da177e4 | 162 | { |
96db255c | 163 | acpi_status status; |
4be44fcd LB |
164 | union acpi_operand_object *return_desc; |
165 | u8 *new_buf; | |
96db255c BM |
166 | u8 *end_tag; |
167 | acpi_size length0; | |
4be44fcd | 168 | acpi_size length1; |
1da177e4 | 169 | |
4be44fcd | 170 | ACPI_FUNCTION_TRACE("ex_concat_template"); |
1da177e4 | 171 | |
96db255c BM |
172 | /* |
173 | * Find the end_tag descriptor in each resource template. | |
174 | * Note: returned pointers point TO the end_tag, not past it. | |
175 | * | |
176 | * Compute the length of each resource template | |
177 | */ | |
178 | status = acpi_ut_get_resource_end_tag(operand0, &end_tag); | |
179 | if (ACPI_FAILURE(status)) { | |
180 | return_ACPI_STATUS(status); | |
181 | } | |
182 | ||
183 | length0 = ACPI_PTR_DIFF(end_tag, operand0->buffer.pointer); | |
1da177e4 | 184 | |
96db255c BM |
185 | status = acpi_ut_get_resource_end_tag(operand1, &end_tag); |
186 | if (ACPI_FAILURE(status)) { | |
187 | return_ACPI_STATUS(status); | |
1da177e4 LT |
188 | } |
189 | ||
96db255c | 190 | /* Include the end_tag in the second template length */ |
1da177e4 | 191 | |
96db255c BM |
192 | length1 = ACPI_PTR_DIFF(end_tag, operand1->buffer.pointer) + |
193 | sizeof(struct aml_resource_end_tag); | |
1da177e4 LT |
194 | |
195 | /* Create a new buffer object for the result */ | |
196 | ||
96db255c | 197 | return_desc = acpi_ut_create_buffer_object(length0 + length1); |
1da177e4 | 198 | if (!return_desc) { |
4be44fcd | 199 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
200 | } |
201 | ||
96db255c BM |
202 | /* |
203 | * Copy the templates to the new buffer, 0 first, then 1 follows. One | |
204 | * end_tag descriptor is copied from Operand1. | |
205 | */ | |
1da177e4 | 206 | new_buf = return_desc->buffer.pointer; |
96db255c BM |
207 | ACPI_MEMCPY(new_buf, operand0->buffer.pointer, length0); |
208 | ACPI_MEMCPY(new_buf + length0, operand1->buffer.pointer, length1); | |
1da177e4 | 209 | |
c51a4de8 | 210 | /* Set the end_tag checksum to zero, means "ignore checksum" */ |
1da177e4 | 211 | |
c51a4de8 | 212 | new_buf[return_desc->buffer.length - 1] = 0; |
1da177e4 | 213 | |
96db255c | 214 | /* Return the completed resource template */ |
1da177e4 LT |
215 | |
216 | *actual_return_desc = return_desc; | |
4be44fcd | 217 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
218 | } |
219 | ||
1da177e4 LT |
220 | /******************************************************************************* |
221 | * | |
222 | * FUNCTION: acpi_ex_do_concatenate | |
223 | * | |
224 | * PARAMETERS: Operand0 - First source object | |
225 | * Operand1 - Second source object | |
226 | * actual_return_desc - Where to place the return object | |
227 | * walk_state - Current walk state | |
228 | * | |
229 | * RETURN: Status | |
230 | * | |
231 | * DESCRIPTION: Concatenate two objects OF THE SAME TYPE. | |
232 | * | |
233 | ******************************************************************************/ | |
234 | ||
235 | acpi_status | |
4be44fcd LB |
236 | acpi_ex_do_concatenate(union acpi_operand_object *operand0, |
237 | union acpi_operand_object *operand1, | |
238 | union acpi_operand_object **actual_return_desc, | |
239 | struct acpi_walk_state *walk_state) | |
1da177e4 | 240 | { |
4be44fcd LB |
241 | union acpi_operand_object *local_operand1 = operand1; |
242 | union acpi_operand_object *return_desc; | |
243 | char *new_buf; | |
244 | acpi_status status; | |
1da177e4 | 245 | |
4be44fcd | 246 | ACPI_FUNCTION_TRACE("ex_do_concatenate"); |
1da177e4 LT |
247 | |
248 | /* | |
249 | * Convert the second operand if necessary. The first operand | |
250 | * determines the type of the second operand, (See the Data Types | |
251 | * section of the ACPI specification.) Both object types are | |
252 | * guaranteed to be either Integer/String/Buffer by the operand | |
253 | * resolution mechanism. | |
254 | */ | |
4be44fcd | 255 | switch (ACPI_GET_OBJECT_TYPE(operand0)) { |
1da177e4 | 256 | case ACPI_TYPE_INTEGER: |
4be44fcd LB |
257 | status = |
258 | acpi_ex_convert_to_integer(operand1, &local_operand1, 16); | |
1da177e4 LT |
259 | break; |
260 | ||
261 | case ACPI_TYPE_STRING: | |
4be44fcd LB |
262 | status = acpi_ex_convert_to_string(operand1, &local_operand1, |
263 | ACPI_IMPLICIT_CONVERT_HEX); | |
1da177e4 LT |
264 | break; |
265 | ||
266 | case ACPI_TYPE_BUFFER: | |
4be44fcd | 267 | status = acpi_ex_convert_to_buffer(operand1, &local_operand1); |
1da177e4 LT |
268 | break; |
269 | ||
270 | default: | |
4a90c7e8 | 271 | ACPI_REPORT_ERROR(("Invalid object type: %X\n", |
4be44fcd | 272 | ACPI_GET_OBJECT_TYPE(operand0))); |
1da177e4 LT |
273 | status = AE_AML_INTERNAL; |
274 | } | |
275 | ||
4be44fcd | 276 | if (ACPI_FAILURE(status)) { |
1da177e4 LT |
277 | goto cleanup; |
278 | } | |
279 | ||
280 | /* | |
281 | * Both operands are now known to be the same object type | |
282 | * (Both are Integer, String, or Buffer), and we can now perform the | |
283 | * concatenation. | |
284 | */ | |
285 | ||
286 | /* | |
287 | * There are three cases to handle: | |
288 | * | |
289 | * 1) Two Integers concatenated to produce a new Buffer | |
290 | * 2) Two Strings concatenated to produce a new String | |
291 | * 3) Two Buffers concatenated to produce a new Buffer | |
292 | */ | |
4be44fcd | 293 | switch (ACPI_GET_OBJECT_TYPE(operand0)) { |
1da177e4 LT |
294 | case ACPI_TYPE_INTEGER: |
295 | ||
296 | /* Result of two Integers is a Buffer */ | |
297 | /* Need enough buffer space for two integers */ | |
298 | ||
4be44fcd LB |
299 | return_desc = acpi_ut_create_buffer_object((acpi_size) |
300 | ACPI_MUL_2 | |
301 | (acpi_gbl_integer_byte_width)); | |
1da177e4 LT |
302 | if (!return_desc) { |
303 | status = AE_NO_MEMORY; | |
304 | goto cleanup; | |
305 | } | |
306 | ||
4be44fcd | 307 | new_buf = (char *)return_desc->buffer.pointer; |
1da177e4 LT |
308 | |
309 | /* Copy the first integer, LSB first */ | |
310 | ||
c51a4de8 | 311 | ACPI_MEMCPY(new_buf, &operand0->integer.value, |
4be44fcd | 312 | acpi_gbl_integer_byte_width); |
1da177e4 LT |
313 | |
314 | /* Copy the second integer (LSB first) after the first */ | |
315 | ||
4be44fcd LB |
316 | ACPI_MEMCPY(new_buf + acpi_gbl_integer_byte_width, |
317 | &local_operand1->integer.value, | |
318 | acpi_gbl_integer_byte_width); | |
1da177e4 LT |
319 | break; |
320 | ||
321 | case ACPI_TYPE_STRING: | |
322 | ||
323 | /* Result of two Strings is a String */ | |
324 | ||
c51a4de8 BM |
325 | return_desc = acpi_ut_create_string_object((acpi_size) |
326 | (operand0->string. | |
327 | length + | |
328 | local_operand1-> | |
329 | string.length)); | |
1da177e4 LT |
330 | if (!return_desc) { |
331 | status = AE_NO_MEMORY; | |
332 | goto cleanup; | |
333 | } | |
334 | ||
335 | new_buf = return_desc->string.pointer; | |
336 | ||
337 | /* Concatenate the strings */ | |
338 | ||
4be44fcd LB |
339 | ACPI_STRCPY(new_buf, operand0->string.pointer); |
340 | ACPI_STRCPY(new_buf + operand0->string.length, | |
341 | local_operand1->string.pointer); | |
1da177e4 LT |
342 | break; |
343 | ||
344 | case ACPI_TYPE_BUFFER: | |
345 | ||
346 | /* Result of two Buffers is a Buffer */ | |
347 | ||
4be44fcd | 348 | return_desc = acpi_ut_create_buffer_object((acpi_size) |
c51a4de8 BM |
349 | (operand0->buffer. |
350 | length + | |
351 | local_operand1-> | |
352 | buffer.length)); | |
1da177e4 LT |
353 | if (!return_desc) { |
354 | status = AE_NO_MEMORY; | |
355 | goto cleanup; | |
356 | } | |
357 | ||
4be44fcd | 358 | new_buf = (char *)return_desc->buffer.pointer; |
1da177e4 LT |
359 | |
360 | /* Concatenate the buffers */ | |
361 | ||
c51a4de8 BM |
362 | ACPI_MEMCPY(new_buf, operand0->buffer.pointer, |
363 | operand0->buffer.length); | |
4be44fcd LB |
364 | ACPI_MEMCPY(new_buf + operand0->buffer.length, |
365 | local_operand1->buffer.pointer, | |
366 | local_operand1->buffer.length); | |
1da177e4 LT |
367 | break; |
368 | ||
369 | default: | |
370 | ||
371 | /* Invalid object type, should not happen here */ | |
372 | ||
4a90c7e8 | 373 | ACPI_REPORT_ERROR(("Invalid object type: %X\n", |
4be44fcd LB |
374 | ACPI_GET_OBJECT_TYPE(operand0))); |
375 | status = AE_AML_INTERNAL; | |
1da177e4 LT |
376 | goto cleanup; |
377 | } | |
378 | ||
379 | *actual_return_desc = return_desc; | |
380 | ||
4be44fcd | 381 | cleanup: |
1da177e4 | 382 | if (local_operand1 != operand1) { |
4be44fcd | 383 | acpi_ut_remove_reference(local_operand1); |
1da177e4 | 384 | } |
4be44fcd | 385 | return_ACPI_STATUS(status); |
1da177e4 LT |
386 | } |
387 | ||
1da177e4 LT |
388 | /******************************************************************************* |
389 | * | |
390 | * FUNCTION: acpi_ex_do_math_op | |
391 | * | |
392 | * PARAMETERS: Opcode - AML opcode | |
393 | * Integer0 - Integer operand #0 | |
394 | * Integer1 - Integer operand #1 | |
395 | * | |
396 | * RETURN: Integer result of the operation | |
397 | * | |
398 | * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the | |
399 | * math functions here is to prevent a lot of pointer dereferencing | |
400 | * to obtain the operands. | |
401 | * | |
402 | ******************************************************************************/ | |
403 | ||
404 | acpi_integer | |
4be44fcd | 405 | acpi_ex_do_math_op(u16 opcode, acpi_integer integer0, acpi_integer integer1) |
1da177e4 LT |
406 | { |
407 | ||
4be44fcd | 408 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
409 | |
410 | switch (opcode) { | |
4be44fcd | 411 | case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */ |
1da177e4 LT |
412 | |
413 | return (integer0 + integer1); | |
414 | ||
4be44fcd | 415 | case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */ |
1da177e4 LT |
416 | |
417 | return (integer0 & integer1); | |
418 | ||
4be44fcd | 419 | case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */ |
1da177e4 LT |
420 | |
421 | return (~(integer0 & integer1)); | |
422 | ||
4be44fcd | 423 | case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */ |
1da177e4 LT |
424 | |
425 | return (integer0 | integer1); | |
426 | ||
4be44fcd | 427 | case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */ |
1da177e4 LT |
428 | |
429 | return (~(integer0 | integer1)); | |
430 | ||
4be44fcd | 431 | case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */ |
1da177e4 LT |
432 | |
433 | return (integer0 ^ integer1); | |
434 | ||
4be44fcd | 435 | case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */ |
1da177e4 LT |
436 | |
437 | return (integer0 * integer1); | |
438 | ||
4be44fcd | 439 | case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result) */ |
1da177e4 LT |
440 | |
441 | return (integer0 << integer1); | |
442 | ||
4be44fcd | 443 | case AML_SHIFT_RIGHT_OP: /* shift_right (Operand, shift_count, Result) */ |
1da177e4 LT |
444 | |
445 | return (integer0 >> integer1); | |
446 | ||
4be44fcd | 447 | case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */ |
1da177e4 LT |
448 | |
449 | return (integer0 - integer1); | |
450 | ||
451 | default: | |
452 | ||
453 | return (0); | |
454 | } | |
455 | } | |
456 | ||
1da177e4 LT |
457 | /******************************************************************************* |
458 | * | |
459 | * FUNCTION: acpi_ex_do_logical_numeric_op | |
460 | * | |
461 | * PARAMETERS: Opcode - AML opcode | |
462 | * Integer0 - Integer operand #0 | |
463 | * Integer1 - Integer operand #1 | |
464 | * logical_result - TRUE/FALSE result of the operation | |
465 | * | |
466 | * RETURN: Status | |
467 | * | |
468 | * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric | |
469 | * operators (LAnd and LOr), both operands must be integers. | |
470 | * | |
471 | * Note: cleanest machine code seems to be produced by the code | |
472 | * below, rather than using statements of the form: | |
473 | * Result = (Integer0 && Integer1); | |
474 | * | |
475 | ******************************************************************************/ | |
476 | ||
477 | acpi_status | |
4be44fcd LB |
478 | acpi_ex_do_logical_numeric_op(u16 opcode, |
479 | acpi_integer integer0, | |
480 | acpi_integer integer1, u8 * logical_result) | |
1da177e4 | 481 | { |
4be44fcd LB |
482 | acpi_status status = AE_OK; |
483 | u8 local_result = FALSE; | |
1da177e4 | 484 | |
4be44fcd | 485 | ACPI_FUNCTION_TRACE("ex_do_logical_numeric_op"); |
1da177e4 LT |
486 | |
487 | switch (opcode) { | |
4be44fcd | 488 | case AML_LAND_OP: /* LAnd (Integer0, Integer1) */ |
1da177e4 LT |
489 | |
490 | if (integer0 && integer1) { | |
491 | local_result = TRUE; | |
492 | } | |
493 | break; | |
494 | ||
4be44fcd | 495 | case AML_LOR_OP: /* LOr (Integer0, Integer1) */ |
1da177e4 LT |
496 | |
497 | if (integer0 || integer1) { | |
498 | local_result = TRUE; | |
499 | } | |
500 | break; | |
501 | ||
502 | default: | |
503 | status = AE_AML_INTERNAL; | |
504 | break; | |
505 | } | |
506 | ||
507 | /* Return the logical result and status */ | |
508 | ||
509 | *logical_result = local_result; | |
4be44fcd | 510 | return_ACPI_STATUS(status); |
1da177e4 LT |
511 | } |
512 | ||
1da177e4 LT |
513 | /******************************************************************************* |
514 | * | |
515 | * FUNCTION: acpi_ex_do_logical_op | |
516 | * | |
517 | * PARAMETERS: Opcode - AML opcode | |
518 | * Operand0 - operand #0 | |
519 | * Operand1 - operand #1 | |
520 | * logical_result - TRUE/FALSE result of the operation | |
521 | * | |
522 | * RETURN: Status | |
523 | * | |
524 | * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the | |
525 | * functions here is to prevent a lot of pointer dereferencing | |
526 | * to obtain the operands and to simplify the generation of the | |
527 | * logical value. For the Numeric operators (LAnd and LOr), both | |
528 | * operands must be integers. For the other logical operators, | |
529 | * operands can be any combination of Integer/String/Buffer. The | |
530 | * first operand determines the type to which the second operand | |
531 | * will be converted. | |
532 | * | |
533 | * Note: cleanest machine code seems to be produced by the code | |
534 | * below, rather than using statements of the form: | |
535 | * Result = (Operand0 == Operand1); | |
536 | * | |
537 | ******************************************************************************/ | |
538 | ||
539 | acpi_status | |
4be44fcd LB |
540 | acpi_ex_do_logical_op(u16 opcode, |
541 | union acpi_operand_object *operand0, | |
542 | union acpi_operand_object *operand1, u8 * logical_result) | |
1da177e4 | 543 | { |
4be44fcd LB |
544 | union acpi_operand_object *local_operand1 = operand1; |
545 | acpi_integer integer0; | |
546 | acpi_integer integer1; | |
547 | u32 length0; | |
548 | u32 length1; | |
549 | acpi_status status = AE_OK; | |
550 | u8 local_result = FALSE; | |
551 | int compare; | |
1da177e4 | 552 | |
4be44fcd | 553 | ACPI_FUNCTION_TRACE("ex_do_logical_op"); |
1da177e4 LT |
554 | |
555 | /* | |
556 | * Convert the second operand if necessary. The first operand | |
557 | * determines the type of the second operand, (See the Data Types | |
558 | * section of the ACPI 3.0+ specification.) Both object types are | |
559 | * guaranteed to be either Integer/String/Buffer by the operand | |
560 | * resolution mechanism. | |
561 | */ | |
4be44fcd | 562 | switch (ACPI_GET_OBJECT_TYPE(operand0)) { |
1da177e4 | 563 | case ACPI_TYPE_INTEGER: |
4be44fcd LB |
564 | status = |
565 | acpi_ex_convert_to_integer(operand1, &local_operand1, 16); | |
1da177e4 LT |
566 | break; |
567 | ||
568 | case ACPI_TYPE_STRING: | |
4be44fcd LB |
569 | status = acpi_ex_convert_to_string(operand1, &local_operand1, |
570 | ACPI_IMPLICIT_CONVERT_HEX); | |
1da177e4 LT |
571 | break; |
572 | ||
573 | case ACPI_TYPE_BUFFER: | |
4be44fcd | 574 | status = acpi_ex_convert_to_buffer(operand1, &local_operand1); |
1da177e4 LT |
575 | break; |
576 | ||
577 | default: | |
578 | status = AE_AML_INTERNAL; | |
579 | break; | |
580 | } | |
581 | ||
4be44fcd | 582 | if (ACPI_FAILURE(status)) { |
1da177e4 LT |
583 | goto cleanup; |
584 | } | |
585 | ||
586 | /* | |
587 | * Two cases: 1) Both Integers, 2) Both Strings or Buffers | |
588 | */ | |
4be44fcd | 589 | if (ACPI_GET_OBJECT_TYPE(operand0) == ACPI_TYPE_INTEGER) { |
1da177e4 LT |
590 | /* |
591 | * 1) Both operands are of type integer | |
592 | * Note: local_operand1 may have changed above | |
593 | */ | |
594 | integer0 = operand0->integer.value; | |
595 | integer1 = local_operand1->integer.value; | |
596 | ||
597 | switch (opcode) { | |
4be44fcd | 598 | case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ |
1da177e4 LT |
599 | |
600 | if (integer0 == integer1) { | |
601 | local_result = TRUE; | |
602 | } | |
603 | break; | |
604 | ||
4be44fcd | 605 | case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ |
1da177e4 LT |
606 | |
607 | if (integer0 > integer1) { | |
608 | local_result = TRUE; | |
609 | } | |
610 | break; | |
611 | ||
4be44fcd | 612 | case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ |
1da177e4 LT |
613 | |
614 | if (integer0 < integer1) { | |
615 | local_result = TRUE; | |
616 | } | |
617 | break; | |
618 | ||
619 | default: | |
620 | status = AE_AML_INTERNAL; | |
621 | break; | |
622 | } | |
4be44fcd | 623 | } else { |
1da177e4 LT |
624 | /* |
625 | * 2) Both operands are Strings or both are Buffers | |
626 | * Note: Code below takes advantage of common Buffer/String | |
627 | * object fields. local_operand1 may have changed above. Use | |
628 | * memcmp to handle nulls in buffers. | |
629 | */ | |
630 | length0 = operand0->buffer.length; | |
631 | length1 = local_operand1->buffer.length; | |
632 | ||
633 | /* Lexicographic compare: compare the data bytes */ | |
634 | ||
0897831b BM |
635 | compare = ACPI_MEMCMP(operand0->buffer.pointer, |
636 | local_operand1->buffer.pointer, | |
4be44fcd | 637 | (length0 > length1) ? length1 : length0); |
1da177e4 LT |
638 | |
639 | switch (opcode) { | |
4be44fcd | 640 | case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ |
1da177e4 LT |
641 | |
642 | /* Length and all bytes must be equal */ | |
643 | ||
4be44fcd | 644 | if ((length0 == length1) && (compare == 0)) { |
1da177e4 LT |
645 | /* Length and all bytes match ==> TRUE */ |
646 | ||
647 | local_result = TRUE; | |
648 | } | |
649 | break; | |
650 | ||
4be44fcd | 651 | case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ |
1da177e4 LT |
652 | |
653 | if (compare > 0) { | |
654 | local_result = TRUE; | |
4be44fcd | 655 | goto cleanup; /* TRUE */ |
1da177e4 LT |
656 | } |
657 | if (compare < 0) { | |
4be44fcd | 658 | goto cleanup; /* FALSE */ |
1da177e4 LT |
659 | } |
660 | ||
661 | /* Bytes match (to shortest length), compare lengths */ | |
662 | ||
663 | if (length0 > length1) { | |
664 | local_result = TRUE; | |
665 | } | |
666 | break; | |
667 | ||
4be44fcd | 668 | case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ |
1da177e4 LT |
669 | |
670 | if (compare > 0) { | |
4be44fcd | 671 | goto cleanup; /* FALSE */ |
1da177e4 LT |
672 | } |
673 | if (compare < 0) { | |
674 | local_result = TRUE; | |
4be44fcd | 675 | goto cleanup; /* TRUE */ |
1da177e4 LT |
676 | } |
677 | ||
678 | /* Bytes match (to shortest length), compare lengths */ | |
679 | ||
680 | if (length0 < length1) { | |
681 | local_result = TRUE; | |
682 | } | |
683 | break; | |
684 | ||
685 | default: | |
686 | status = AE_AML_INTERNAL; | |
687 | break; | |
688 | } | |
689 | } | |
690 | ||
4be44fcd | 691 | cleanup: |
1da177e4 LT |
692 | |
693 | /* New object was created if implicit conversion performed - delete */ | |
694 | ||
695 | if (local_operand1 != operand1) { | |
4be44fcd | 696 | acpi_ut_remove_reference(local_operand1); |
1da177e4 LT |
697 | } |
698 | ||
699 | /* Return the logical result and status */ | |
700 | ||
701 | *logical_result = local_result; | |
4be44fcd | 702 | return_ACPI_STATUS(status); |
1da177e4 | 703 | } |