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