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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
25f044e6 | 8 | * Copyright (C) 2000 - 2013, Intel Corp. |
1da177e4 LT |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
1da177e4 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "acinterp.h" | |
47 | #include "amlcode.h" | |
48 | #include "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 | |
b229cf92 | 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 | ||
3371c19c | 82 | if (obj_desc->common.type != ACPI_TYPE_LOCAL_REFERENCE) { |
4be44fcd | 83 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 LT |
84 | } |
85 | ||
86 | /* | |
87 | * Must be a reference to a Local or Arg | |
88 | */ | |
1044f1f6 BM |
89 | switch (obj_desc->reference.class) { |
90 | case ACPI_REFCLASS_LOCAL: | |
91 | case ACPI_REFCLASS_ARG: | |
92 | case ACPI_REFCLASS_DEBUG: | |
1da177e4 LT |
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 | ||
f6a22b0b | 101 | ACPI_ERROR((AE_INFO, "Unknown Reference Class 0x%2.2X", |
1044f1f6 | 102 | obj_desc->reference.class)); |
4be44fcd | 103 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
104 | } |
105 | break; | |
106 | ||
1da177e4 | 107 | case ACPI_DESC_TYPE_NAMED: |
1da177e4 LT |
108 | /* |
109 | * A named reference that has already been resolved to a Node | |
110 | */ | |
111 | referenced_obj = obj_desc; | |
112 | break; | |
113 | ||
1da177e4 LT |
114 | default: |
115 | ||
f6a22b0b | 116 | ACPI_ERROR((AE_INFO, "Invalid descriptor type 0x%X", |
b8e4d893 | 117 | ACPI_GET_DESCRIPTOR_TYPE(obj_desc))); |
4be44fcd | 118 | return_ACPI_STATUS(AE_TYPE); |
1da177e4 LT |
119 | } |
120 | ||
1da177e4 LT |
121 | /* Create a new reference object */ |
122 | ||
4be44fcd LB |
123 | reference_obj = |
124 | acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE); | |
1da177e4 | 125 | if (!reference_obj) { |
4be44fcd | 126 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
127 | } |
128 | ||
1044f1f6 | 129 | reference_obj->reference.class = ACPI_REFCLASS_REFOF; |
1da177e4 LT |
130 | reference_obj->reference.object = referenced_obj; |
131 | *return_desc = reference_obj; | |
132 | ||
4be44fcd LB |
133 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
134 | "Object %p Type [%s], returning Reference %p\n", | |
135 | obj_desc, acpi_ut_get_object_type_name(obj_desc), | |
136 | *return_desc)); | |
1da177e4 | 137 | |
4be44fcd | 138 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
139 | } |
140 | ||
1da177e4 LT |
141 | /******************************************************************************* |
142 | * | |
143 | * FUNCTION: acpi_ex_concat_template | |
144 | * | |
ba494bee BM |
145 | * PARAMETERS: operand0 - First source object |
146 | * operand1 - Second source object | |
1da177e4 LT |
147 | * actual_return_desc - Where to place the return object |
148 | * walk_state - Current walk state | |
149 | * | |
150 | * RETURN: Status | |
151 | * | |
152 | * DESCRIPTION: Concatenate two resource templates | |
153 | * | |
154 | ******************************************************************************/ | |
155 | ||
156 | acpi_status | |
4be44fcd LB |
157 | acpi_ex_concat_template(union acpi_operand_object *operand0, |
158 | union acpi_operand_object *operand1, | |
159 | union acpi_operand_object **actual_return_desc, | |
160 | struct acpi_walk_state *walk_state) | |
1da177e4 | 161 | { |
96db255c | 162 | acpi_status status; |
4be44fcd LB |
163 | union acpi_operand_object *return_desc; |
164 | u8 *new_buf; | |
96db255c BM |
165 | u8 *end_tag; |
166 | acpi_size length0; | |
4be44fcd | 167 | acpi_size length1; |
b8e4d893 | 168 | acpi_size new_length; |
1da177e4 | 169 | |
b229cf92 | 170 | ACPI_FUNCTION_TRACE(ex_concat_template); |
1da177e4 | 171 | |
96db255c BM |
172 | /* |
173 | * Find the end_tag descriptor in each resource template. | |
b8e4d893 BM |
174 | * Note1: returned pointers point TO the end_tag, not past it. |
175 | * Note2: zero-length buffers are allowed; treated like one end_tag | |
96db255c | 176 | */ |
b8e4d893 BM |
177 | |
178 | /* Get the length of the first resource template */ | |
179 | ||
96db255c BM |
180 | status = acpi_ut_get_resource_end_tag(operand0, &end_tag); |
181 | if (ACPI_FAILURE(status)) { | |
182 | return_ACPI_STATUS(status); | |
183 | } | |
184 | ||
185 | length0 = ACPI_PTR_DIFF(end_tag, operand0->buffer.pointer); | |
1da177e4 | 186 | |
b8e4d893 BM |
187 | /* Get the length of the second resource template */ |
188 | ||
96db255c BM |
189 | status = acpi_ut_get_resource_end_tag(operand1, &end_tag); |
190 | if (ACPI_FAILURE(status)) { | |
191 | return_ACPI_STATUS(status); | |
1da177e4 LT |
192 | } |
193 | ||
b8e4d893 BM |
194 | length1 = ACPI_PTR_DIFF(end_tag, operand1->buffer.pointer); |
195 | ||
196 | /* Combine both lengths, minimum size will be 2 for end_tag */ | |
1da177e4 | 197 | |
b8e4d893 | 198 | new_length = length0 + length1 + sizeof(struct aml_resource_end_tag); |
1da177e4 | 199 | |
b8e4d893 | 200 | /* Create a new buffer object for the result (with one end_tag) */ |
1da177e4 | 201 | |
b8e4d893 | 202 | return_desc = acpi_ut_create_buffer_object(new_length); |
1da177e4 | 203 | if (!return_desc) { |
4be44fcd | 204 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
205 | } |
206 | ||
96db255c BM |
207 | /* |
208 | * Copy the templates to the new buffer, 0 first, then 1 follows. One | |
209 | * end_tag descriptor is copied from Operand1. | |
210 | */ | |
1da177e4 | 211 | new_buf = return_desc->buffer.pointer; |
96db255c BM |
212 | ACPI_MEMCPY(new_buf, operand0->buffer.pointer, length0); |
213 | ACPI_MEMCPY(new_buf + length0, operand1->buffer.pointer, length1); | |
1da177e4 | 214 | |
b8e4d893 | 215 | /* Insert end_tag and set the checksum to zero, means "ignore checksum" */ |
1da177e4 | 216 | |
b8e4d893 BM |
217 | new_buf[new_length - 1] = 0; |
218 | new_buf[new_length - 2] = ACPI_RESOURCE_NAME_END_TAG | 1; | |
1da177e4 | 219 | |
96db255c | 220 | /* Return the completed resource template */ |
1da177e4 LT |
221 | |
222 | *actual_return_desc = return_desc; | |
4be44fcd | 223 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
224 | } |
225 | ||
1da177e4 LT |
226 | /******************************************************************************* |
227 | * | |
228 | * FUNCTION: acpi_ex_do_concatenate | |
229 | * | |
ba494bee BM |
230 | * PARAMETERS: operand0 - First source object |
231 | * operand1 - Second source object | |
1da177e4 LT |
232 | * actual_return_desc - Where to place the return object |
233 | * walk_state - Current walk state | |
234 | * | |
235 | * RETURN: Status | |
236 | * | |
237 | * DESCRIPTION: Concatenate two objects OF THE SAME TYPE. | |
238 | * | |
239 | ******************************************************************************/ | |
240 | ||
241 | acpi_status | |
4be44fcd LB |
242 | acpi_ex_do_concatenate(union acpi_operand_object *operand0, |
243 | union acpi_operand_object *operand1, | |
244 | union acpi_operand_object **actual_return_desc, | |
245 | struct acpi_walk_state *walk_state) | |
1da177e4 | 246 | { |
4be44fcd LB |
247 | union acpi_operand_object *local_operand1 = operand1; |
248 | union acpi_operand_object *return_desc; | |
249 | char *new_buf; | |
250 | acpi_status status; | |
1da177e4 | 251 | |
b229cf92 | 252 | ACPI_FUNCTION_TRACE(ex_do_concatenate); |
1da177e4 LT |
253 | |
254 | /* | |
73a3090a | 255 | * Convert the second operand if necessary. The first operand |
1da177e4 LT |
256 | * determines the type of the second operand, (See the Data Types |
257 | * section of the ACPI specification.) Both object types are | |
258 | * guaranteed to be either Integer/String/Buffer by the operand | |
259 | * resolution mechanism. | |
260 | */ | |
3371c19c | 261 | switch (operand0->common.type) { |
1da177e4 | 262 | case ACPI_TYPE_INTEGER: |
1d1ea1b7 | 263 | |
4be44fcd LB |
264 | status = |
265 | acpi_ex_convert_to_integer(operand1, &local_operand1, 16); | |
1da177e4 LT |
266 | break; |
267 | ||
268 | case ACPI_TYPE_STRING: | |
1d1ea1b7 | 269 | |
4be44fcd LB |
270 | status = acpi_ex_convert_to_string(operand1, &local_operand1, |
271 | ACPI_IMPLICIT_CONVERT_HEX); | |
1da177e4 LT |
272 | break; |
273 | ||
274 | case ACPI_TYPE_BUFFER: | |
1d1ea1b7 | 275 | |
4be44fcd | 276 | status = acpi_ex_convert_to_buffer(operand1, &local_operand1); |
1da177e4 LT |
277 | break; |
278 | ||
279 | default: | |
1d1ea1b7 | 280 | |
f6a22b0b | 281 | ACPI_ERROR((AE_INFO, "Invalid object type: 0x%X", |
3371c19c | 282 | operand0->common.type)); |
1da177e4 LT |
283 | status = AE_AML_INTERNAL; |
284 | } | |
285 | ||
4be44fcd | 286 | if (ACPI_FAILURE(status)) { |
1da177e4 LT |
287 | goto cleanup; |
288 | } | |
289 | ||
290 | /* | |
291 | * Both operands are now known to be the same object type | |
292 | * (Both are Integer, String, or Buffer), and we can now perform the | |
293 | * concatenation. | |
294 | */ | |
295 | ||
296 | /* | |
297 | * There are three cases to handle: | |
298 | * | |
299 | * 1) Two Integers concatenated to produce a new Buffer | |
300 | * 2) Two Strings concatenated to produce a new String | |
301 | * 3) Two Buffers concatenated to produce a new Buffer | |
302 | */ | |
3371c19c | 303 | switch (operand0->common.type) { |
1da177e4 LT |
304 | case ACPI_TYPE_INTEGER: |
305 | ||
306 | /* Result of two Integers is a Buffer */ | |
307 | /* Need enough buffer space for two integers */ | |
308 | ||
4be44fcd LB |
309 | return_desc = acpi_ut_create_buffer_object((acpi_size) |
310 | ACPI_MUL_2 | |
311 | (acpi_gbl_integer_byte_width)); | |
1da177e4 LT |
312 | if (!return_desc) { |
313 | status = AE_NO_MEMORY; | |
314 | goto cleanup; | |
315 | } | |
316 | ||
4be44fcd | 317 | new_buf = (char *)return_desc->buffer.pointer; |
1da177e4 LT |
318 | |
319 | /* Copy the first integer, LSB first */ | |
320 | ||
c51a4de8 | 321 | ACPI_MEMCPY(new_buf, &operand0->integer.value, |
4be44fcd | 322 | acpi_gbl_integer_byte_width); |
1da177e4 LT |
323 | |
324 | /* Copy the second integer (LSB first) after the first */ | |
325 | ||
4be44fcd LB |
326 | ACPI_MEMCPY(new_buf + acpi_gbl_integer_byte_width, |
327 | &local_operand1->integer.value, | |
328 | acpi_gbl_integer_byte_width); | |
1da177e4 LT |
329 | break; |
330 | ||
331 | case ACPI_TYPE_STRING: | |
332 | ||
333 | /* Result of two Strings is a String */ | |
334 | ||
67a119f9 BM |
335 | return_desc = acpi_ut_create_string_object(((acpi_size) |
336 | operand0->string. | |
c51a4de8 BM |
337 | length + |
338 | local_operand1-> | |
339 | string.length)); | |
1da177e4 LT |
340 | if (!return_desc) { |
341 | status = AE_NO_MEMORY; | |
342 | goto cleanup; | |
343 | } | |
344 | ||
345 | new_buf = return_desc->string.pointer; | |
346 | ||
347 | /* Concatenate the strings */ | |
348 | ||
4be44fcd LB |
349 | ACPI_STRCPY(new_buf, operand0->string.pointer); |
350 | ACPI_STRCPY(new_buf + operand0->string.length, | |
351 | local_operand1->string.pointer); | |
1da177e4 LT |
352 | break; |
353 | ||
354 | case ACPI_TYPE_BUFFER: | |
355 | ||
356 | /* Result of two Buffers is a Buffer */ | |
357 | ||
67a119f9 BM |
358 | return_desc = acpi_ut_create_buffer_object(((acpi_size) |
359 | operand0->buffer. | |
c51a4de8 BM |
360 | length + |
361 | local_operand1-> | |
362 | buffer.length)); | |
1da177e4 LT |
363 | if (!return_desc) { |
364 | status = AE_NO_MEMORY; | |
365 | goto cleanup; | |
366 | } | |
367 | ||
4be44fcd | 368 | new_buf = (char *)return_desc->buffer.pointer; |
1da177e4 LT |
369 | |
370 | /* Concatenate the buffers */ | |
371 | ||
c51a4de8 BM |
372 | ACPI_MEMCPY(new_buf, operand0->buffer.pointer, |
373 | operand0->buffer.length); | |
4be44fcd LB |
374 | ACPI_MEMCPY(new_buf + operand0->buffer.length, |
375 | local_operand1->buffer.pointer, | |
376 | local_operand1->buffer.length); | |
1da177e4 LT |
377 | break; |
378 | ||
379 | default: | |
380 | ||
381 | /* Invalid object type, should not happen here */ | |
382 | ||
f6a22b0b | 383 | ACPI_ERROR((AE_INFO, "Invalid object type: 0x%X", |
3371c19c | 384 | operand0->common.type)); |
4be44fcd | 385 | status = AE_AML_INTERNAL; |
1da177e4 LT |
386 | goto cleanup; |
387 | } | |
388 | ||
389 | *actual_return_desc = return_desc; | |
390 | ||
10622bf8 | 391 | cleanup: |
1da177e4 | 392 | if (local_operand1 != operand1) { |
4be44fcd | 393 | acpi_ut_remove_reference(local_operand1); |
1da177e4 | 394 | } |
4be44fcd | 395 | return_ACPI_STATUS(status); |
1da177e4 LT |
396 | } |
397 | ||
1da177e4 LT |
398 | /******************************************************************************* |
399 | * | |
400 | * FUNCTION: acpi_ex_do_math_op | |
401 | * | |
ba494bee BM |
402 | * PARAMETERS: opcode - AML opcode |
403 | * integer0 - Integer operand #0 | |
404 | * integer1 - Integer operand #1 | |
1da177e4 LT |
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 | ||
5df7e6cb | 414 | u64 acpi_ex_do_math_op(u16 opcode, u64 integer0, u64 integer1) |
1da177e4 LT |
415 | { |
416 | ||
4be44fcd | 417 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
418 | |
419 | switch (opcode) { | |
4be44fcd | 420 | case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */ |
1da177e4 LT |
421 | |
422 | return (integer0 + integer1); | |
423 | ||
4be44fcd | 424 | case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */ |
1da177e4 LT |
425 | |
426 | return (integer0 & integer1); | |
427 | ||
4be44fcd | 428 | case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */ |
1da177e4 LT |
429 | |
430 | return (~(integer0 & integer1)); | |
431 | ||
4be44fcd | 432 | case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */ |
1da177e4 LT |
433 | |
434 | return (integer0 | integer1); | |
435 | ||
4be44fcd | 436 | case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */ |
1da177e4 LT |
437 | |
438 | return (~(integer0 | integer1)); | |
439 | ||
4be44fcd | 440 | case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */ |
1da177e4 LT |
441 | |
442 | return (integer0 ^ integer1); | |
443 | ||
4be44fcd | 444 | case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */ |
1da177e4 LT |
445 | |
446 | return (integer0 * integer1); | |
447 | ||
4be44fcd | 448 | case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result) */ |
1da177e4 | 449 | |
4119532c BM |
450 | /* |
451 | * We need to check if the shiftcount is larger than the integer bit | |
452 | * width since the behavior of this is not well-defined in the C language. | |
453 | */ | |
454 | if (integer1 >= acpi_gbl_integer_bit_width) { | |
455 | return (0); | |
456 | } | |
1da177e4 LT |
457 | return (integer0 << integer1); |
458 | ||
4be44fcd | 459 | case AML_SHIFT_RIGHT_OP: /* shift_right (Operand, shift_count, Result) */ |
1da177e4 | 460 | |
4119532c BM |
461 | /* |
462 | * We need to check if the shiftcount is larger than the integer bit | |
463 | * width since the behavior of this is not well-defined in the C language. | |
464 | */ | |
465 | if (integer1 >= acpi_gbl_integer_bit_width) { | |
466 | return (0); | |
467 | } | |
1da177e4 LT |
468 | return (integer0 >> integer1); |
469 | ||
4be44fcd | 470 | case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */ |
1da177e4 LT |
471 | |
472 | return (integer0 - integer1); | |
473 | ||
474 | default: | |
475 | ||
476 | return (0); | |
477 | } | |
478 | } | |
479 | ||
1da177e4 LT |
480 | /******************************************************************************* |
481 | * | |
482 | * FUNCTION: acpi_ex_do_logical_numeric_op | |
483 | * | |
ba494bee BM |
484 | * PARAMETERS: opcode - AML opcode |
485 | * integer0 - Integer operand #0 | |
486 | * integer1 - Integer operand #1 | |
1da177e4 LT |
487 | * logical_result - TRUE/FALSE result of the operation |
488 | * | |
489 | * RETURN: Status | |
490 | * | |
491 | * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric | |
492 | * operators (LAnd and LOr), both operands must be integers. | |
493 | * | |
494 | * Note: cleanest machine code seems to be produced by the code | |
495 | * below, rather than using statements of the form: | |
496 | * Result = (Integer0 && Integer1); | |
497 | * | |
498 | ******************************************************************************/ | |
499 | ||
500 | acpi_status | |
4be44fcd | 501 | acpi_ex_do_logical_numeric_op(u16 opcode, |
5df7e6cb | 502 | u64 integer0, u64 integer1, u8 *logical_result) |
1da177e4 | 503 | { |
4be44fcd LB |
504 | acpi_status status = AE_OK; |
505 | u8 local_result = FALSE; | |
1da177e4 | 506 | |
b229cf92 | 507 | ACPI_FUNCTION_TRACE(ex_do_logical_numeric_op); |
1da177e4 LT |
508 | |
509 | switch (opcode) { | |
4be44fcd | 510 | case AML_LAND_OP: /* LAnd (Integer0, Integer1) */ |
1da177e4 LT |
511 | |
512 | if (integer0 && integer1) { | |
513 | local_result = TRUE; | |
514 | } | |
515 | break; | |
516 | ||
4be44fcd | 517 | case AML_LOR_OP: /* LOr (Integer0, Integer1) */ |
1da177e4 LT |
518 | |
519 | if (integer0 || integer1) { | |
520 | local_result = TRUE; | |
521 | } | |
522 | break; | |
523 | ||
524 | default: | |
1d1ea1b7 | 525 | |
1da177e4 LT |
526 | status = AE_AML_INTERNAL; |
527 | break; | |
528 | } | |
529 | ||
530 | /* Return the logical result and status */ | |
531 | ||
532 | *logical_result = local_result; | |
4be44fcd | 533 | return_ACPI_STATUS(status); |
1da177e4 LT |
534 | } |
535 | ||
1da177e4 LT |
536 | /******************************************************************************* |
537 | * | |
538 | * FUNCTION: acpi_ex_do_logical_op | |
539 | * | |
ba494bee BM |
540 | * PARAMETERS: opcode - AML opcode |
541 | * operand0 - operand #0 | |
542 | * operand1 - operand #1 | |
1da177e4 LT |
543 | * logical_result - TRUE/FALSE result of the operation |
544 | * | |
545 | * RETURN: Status | |
546 | * | |
547 | * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the | |
548 | * functions here is to prevent a lot of pointer dereferencing | |
549 | * to obtain the operands and to simplify the generation of the | |
550 | * logical value. For the Numeric operators (LAnd and LOr), both | |
551 | * operands must be integers. For the other logical operators, | |
552 | * operands can be any combination of Integer/String/Buffer. The | |
553 | * first operand determines the type to which the second operand | |
554 | * will be converted. | |
555 | * | |
556 | * Note: cleanest machine code seems to be produced by the code | |
557 | * below, rather than using statements of the form: | |
558 | * Result = (Operand0 == Operand1); | |
559 | * | |
560 | ******************************************************************************/ | |
561 | ||
562 | acpi_status | |
4be44fcd LB |
563 | acpi_ex_do_logical_op(u16 opcode, |
564 | union acpi_operand_object *operand0, | |
565 | union acpi_operand_object *operand1, u8 * logical_result) | |
1da177e4 | 566 | { |
4be44fcd | 567 | union acpi_operand_object *local_operand1 = operand1; |
5df7e6cb BM |
568 | u64 integer0; |
569 | u64 integer1; | |
4be44fcd LB |
570 | u32 length0; |
571 | u32 length1; | |
572 | acpi_status status = AE_OK; | |
573 | u8 local_result = FALSE; | |
574 | int compare; | |
1da177e4 | 575 | |
b229cf92 | 576 | ACPI_FUNCTION_TRACE(ex_do_logical_op); |
1da177e4 LT |
577 | |
578 | /* | |
73a3090a | 579 | * Convert the second operand if necessary. The first operand |
1da177e4 LT |
580 | * determines the type of the second operand, (See the Data Types |
581 | * section of the ACPI 3.0+ specification.) Both object types are | |
582 | * guaranteed to be either Integer/String/Buffer by the operand | |
583 | * resolution mechanism. | |
584 | */ | |
3371c19c | 585 | switch (operand0->common.type) { |
1da177e4 | 586 | case ACPI_TYPE_INTEGER: |
1d1ea1b7 | 587 | |
4be44fcd LB |
588 | status = |
589 | acpi_ex_convert_to_integer(operand1, &local_operand1, 16); | |
1da177e4 LT |
590 | break; |
591 | ||
592 | case ACPI_TYPE_STRING: | |
1d1ea1b7 | 593 | |
4be44fcd LB |
594 | status = acpi_ex_convert_to_string(operand1, &local_operand1, |
595 | ACPI_IMPLICIT_CONVERT_HEX); | |
1da177e4 LT |
596 | break; |
597 | ||
598 | case ACPI_TYPE_BUFFER: | |
1d1ea1b7 | 599 | |
4be44fcd | 600 | status = acpi_ex_convert_to_buffer(operand1, &local_operand1); |
1da177e4 LT |
601 | break; |
602 | ||
603 | default: | |
1d1ea1b7 | 604 | |
1da177e4 LT |
605 | status = AE_AML_INTERNAL; |
606 | break; | |
607 | } | |
608 | ||
4be44fcd | 609 | if (ACPI_FAILURE(status)) { |
1da177e4 LT |
610 | goto cleanup; |
611 | } | |
612 | ||
613 | /* | |
614 | * Two cases: 1) Both Integers, 2) Both Strings or Buffers | |
615 | */ | |
3371c19c | 616 | if (operand0->common.type == ACPI_TYPE_INTEGER) { |
1da177e4 LT |
617 | /* |
618 | * 1) Both operands are of type integer | |
619 | * Note: local_operand1 may have changed above | |
620 | */ | |
621 | integer0 = operand0->integer.value; | |
622 | integer1 = local_operand1->integer.value; | |
623 | ||
624 | switch (opcode) { | |
4be44fcd | 625 | case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ |
1da177e4 LT |
626 | |
627 | if (integer0 == integer1) { | |
628 | local_result = TRUE; | |
629 | } | |
630 | break; | |
631 | ||
4be44fcd | 632 | case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ |
1da177e4 LT |
633 | |
634 | if (integer0 > integer1) { | |
635 | local_result = TRUE; | |
636 | } | |
637 | break; | |
638 | ||
4be44fcd | 639 | case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ |
1da177e4 LT |
640 | |
641 | if (integer0 < integer1) { | |
642 | local_result = TRUE; | |
643 | } | |
644 | break; | |
645 | ||
646 | default: | |
1d1ea1b7 | 647 | |
1da177e4 LT |
648 | status = AE_AML_INTERNAL; |
649 | break; | |
650 | } | |
4be44fcd | 651 | } else { |
1da177e4 LT |
652 | /* |
653 | * 2) Both operands are Strings or both are Buffers | |
654 | * Note: Code below takes advantage of common Buffer/String | |
655 | * object fields. local_operand1 may have changed above. Use | |
656 | * memcmp to handle nulls in buffers. | |
657 | */ | |
658 | length0 = operand0->buffer.length; | |
659 | length1 = local_operand1->buffer.length; | |
660 | ||
661 | /* Lexicographic compare: compare the data bytes */ | |
662 | ||
0897831b BM |
663 | compare = ACPI_MEMCMP(operand0->buffer.pointer, |
664 | local_operand1->buffer.pointer, | |
4be44fcd | 665 | (length0 > length1) ? length1 : length0); |
1da177e4 LT |
666 | |
667 | switch (opcode) { | |
4be44fcd | 668 | case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ |
1da177e4 LT |
669 | |
670 | /* Length and all bytes must be equal */ | |
671 | ||
4be44fcd | 672 | if ((length0 == length1) && (compare == 0)) { |
52fc0b02 | 673 | |
1da177e4 LT |
674 | /* Length and all bytes match ==> TRUE */ |
675 | ||
676 | local_result = TRUE; | |
677 | } | |
678 | break; | |
679 | ||
4be44fcd | 680 | case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ |
1da177e4 LT |
681 | |
682 | if (compare > 0) { | |
683 | local_result = TRUE; | |
4be44fcd | 684 | goto cleanup; /* TRUE */ |
1da177e4 LT |
685 | } |
686 | if (compare < 0) { | |
4be44fcd | 687 | goto cleanup; /* FALSE */ |
1da177e4 LT |
688 | } |
689 | ||
690 | /* Bytes match (to shortest length), compare lengths */ | |
691 | ||
692 | if (length0 > length1) { | |
693 | local_result = TRUE; | |
694 | } | |
695 | break; | |
696 | ||
4be44fcd | 697 | case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ |
1da177e4 LT |
698 | |
699 | if (compare > 0) { | |
4be44fcd | 700 | goto cleanup; /* FALSE */ |
1da177e4 LT |
701 | } |
702 | if (compare < 0) { | |
703 | local_result = TRUE; | |
4be44fcd | 704 | goto cleanup; /* TRUE */ |
1da177e4 LT |
705 | } |
706 | ||
707 | /* Bytes match (to shortest length), compare lengths */ | |
708 | ||
709 | if (length0 < length1) { | |
710 | local_result = TRUE; | |
711 | } | |
712 | break; | |
713 | ||
714 | default: | |
1d1ea1b7 | 715 | |
1da177e4 LT |
716 | status = AE_AML_INTERNAL; |
717 | break; | |
718 | } | |
719 | } | |
720 | ||
10622bf8 | 721 | cleanup: |
1da177e4 LT |
722 | |
723 | /* New object was created if implicit conversion performed - delete */ | |
724 | ||
725 | if (local_operand1 != operand1) { | |
4be44fcd | 726 | acpi_ut_remove_reference(local_operand1); |
1da177e4 LT |
727 | } |
728 | ||
729 | /* Return the logical result and status */ | |
730 | ||
731 | *logical_result = local_result; | |
4be44fcd | 732 | return_ACPI_STATUS(status); |
1da177e4 | 733 | } |