1
2 /******************************************************************************
3 *
4 * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2004, 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
45
46 #include <acpi/acpi.h>
47 #include <acpi/acinterp.h>
48 #include <acpi/amlcode.h>
49
50
51 #define _COMPONENT ACPI_EXECUTER
52 ACPI_MODULE_NAME ("exmisc")
53
54
55 /*******************************************************************************
56 *
57 * FUNCTION: acpi_ex_get_object_reference
58 *
59 * PARAMETERS: obj_desc - Create a reference to this object
60 * return_desc - Where to store the reference
61 * walk_state - Current state
62 *
63 * RETURN: Status
64 *
65 * DESCRIPTION: Obtain and return a "reference" to the target object
66 * Common code for the ref_of_op and the cond_ref_of_op.
67 *
68 ******************************************************************************/
69
70 acpi_status
acpi_ex_get_object_reference(union acpi_operand_object * obj_desc,union acpi_operand_object ** return_desc,struct acpi_walk_state * walk_state)71 acpi_ex_get_object_reference (
72 union acpi_operand_object *obj_desc,
73 union acpi_operand_object **return_desc,
74 struct acpi_walk_state *walk_state)
75 {
76 union acpi_operand_object *reference_obj;
77 union acpi_operand_object *referenced_obj;
78
79
80 ACPI_FUNCTION_TRACE_PTR ("ex_get_object_reference", obj_desc);
81
82
83 *return_desc = NULL;
84
85 switch (ACPI_GET_DESCRIPTOR_TYPE (obj_desc)) {
86 case ACPI_DESC_TYPE_OPERAND:
87
88 if (ACPI_GET_OBJECT_TYPE (obj_desc) != ACPI_TYPE_LOCAL_REFERENCE) {
89 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
90 }
91
92 /*
93 * Must be a reference to a Local or Arg
94 */
95 switch (obj_desc->reference.opcode) {
96 case AML_LOCAL_OP:
97 case AML_ARG_OP:
98
99 /* The referenced object is the pseudo-node for the local/arg */
100
101 referenced_obj = obj_desc->reference.object;
102 break;
103
104 default:
105
106 ACPI_REPORT_ERROR (("Unknown Reference subtype in get ref %X\n",
107 obj_desc->reference.opcode));
108 return_ACPI_STATUS (AE_AML_INTERNAL);
109 }
110 break;
111
112
113 case ACPI_DESC_TYPE_NAMED:
114
115 /*
116 * A named reference that has already been resolved to a Node
117 */
118 referenced_obj = obj_desc;
119 break;
120
121
122 default:
123
124 ACPI_REPORT_ERROR (("Invalid descriptor type in get ref: %X\n",
125 ACPI_GET_DESCRIPTOR_TYPE (obj_desc)));
126 return_ACPI_STATUS (AE_TYPE);
127 }
128
129
130 /* Create a new reference object */
131
132 reference_obj = acpi_ut_create_internal_object (ACPI_TYPE_LOCAL_REFERENCE);
133 if (!reference_obj) {
134 return_ACPI_STATUS (AE_NO_MEMORY);
135 }
136
137 reference_obj->reference.opcode = AML_REF_OF_OP;
138 reference_obj->reference.object = referenced_obj;
139 *return_desc = reference_obj;
140
141 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Object %p Type [%s], returning Reference %p\n",
142 obj_desc, acpi_ut_get_object_type_name (obj_desc), *return_desc));
143
144 return_ACPI_STATUS (AE_OK);
145 }
146
147
148 /*******************************************************************************
149 *
150 * FUNCTION: acpi_ex_concat_template
151 *
152 * PARAMETERS: *obj_desc - Object to be converted. Must be an
153 * Integer, Buffer, or String
154 * walk_state - Current walk state
155 *
156 * RETURN: Status
157 *
158 * DESCRIPTION: Concatenate two resource templates
159 *
160 ******************************************************************************/
161
162 acpi_status
acpi_ex_concat_template(union acpi_operand_object * obj_desc1,union acpi_operand_object * obj_desc2,union acpi_operand_object ** actual_return_desc,struct acpi_walk_state * walk_state)163 acpi_ex_concat_template (
164 union acpi_operand_object *obj_desc1,
165 union acpi_operand_object *obj_desc2,
166 union acpi_operand_object **actual_return_desc,
167 struct acpi_walk_state *walk_state)
168 {
169 union acpi_operand_object *return_desc;
170 u8 *new_buf;
171 u8 *end_tag1;
172 u8 *end_tag2;
173 acpi_size length1;
174 acpi_size length2;
175
176
177 ACPI_FUNCTION_TRACE ("ex_concat_template");
178
179
180 /* Find the end_tags in each resource template */
181
182 end_tag1 = acpi_ut_get_resource_end_tag (obj_desc1);
183 end_tag2 = acpi_ut_get_resource_end_tag (obj_desc2);
184 if (!end_tag1 || !end_tag2) {
185 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
186 }
187
188 /* Compute the length of each part */
189
190 length1 = ACPI_PTR_DIFF (end_tag1, obj_desc1->buffer.pointer);
191 length2 = ACPI_PTR_DIFF (end_tag2, obj_desc2->buffer.pointer) +
192 2; /* Size of END_TAG */
193
194 /* Create a new buffer object for the result */
195
196 return_desc = acpi_ut_create_buffer_object (length1 + length2);
197 if (!return_desc) {
198 return_ACPI_STATUS (AE_NO_MEMORY);
199 }
200
201 /* Copy the templates to the new descriptor */
202
203 new_buf = return_desc->buffer.pointer;
204 ACPI_MEMCPY (new_buf, obj_desc1->buffer.pointer, length1);
205 ACPI_MEMCPY (new_buf + length1, obj_desc2->buffer.pointer, length2);
206
207 /* Compute the new checksum */
208
209 new_buf[return_desc->buffer.length - 1] =
210 acpi_ut_generate_checksum (return_desc->buffer.pointer,
211 (return_desc->buffer.length - 1));
212
213 /* Return the completed template descriptor */
214
215 *actual_return_desc = return_desc;
216 return_ACPI_STATUS (AE_OK);
217 }
218
219
220 /*******************************************************************************
221 *
222 * FUNCTION: acpi_ex_do_concatenate
223 *
224 * PARAMETERS: obj_desc1 - First source object
225 * obj_desc2 - 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
acpi_ex_do_concatenate(union acpi_operand_object * obj_desc1,union acpi_operand_object * obj_desc2,union acpi_operand_object ** actual_return_desc,struct acpi_walk_state * walk_state)236 acpi_ex_do_concatenate (
237 union acpi_operand_object *obj_desc1,
238 union acpi_operand_object *obj_desc2,
239 union acpi_operand_object **actual_return_desc,
240 struct acpi_walk_state *walk_state)
241 {
242 acpi_status status;
243 u32 i;
244 acpi_integer this_integer;
245 union acpi_operand_object *return_desc;
246 char *new_buf;
247
248
249 ACPI_FUNCTION_ENTRY ();
250
251
252 /*
253 * There are three cases to handle:
254 *
255 * 1) Two Integers concatenated to produce a new Buffer
256 * 2) Two Strings concatenated to produce a new String
257 * 3) Two Buffers concatenated to produce a new Buffer
258 */
259 switch (ACPI_GET_OBJECT_TYPE (obj_desc1)) {
260 case ACPI_TYPE_INTEGER:
261
262 /* Result of two Integers is a Buffer */
263 /* Need enough buffer space for two integers */
264
265 return_desc = acpi_ut_create_buffer_object (acpi_gbl_integer_byte_width * 2);
266 if (!return_desc) {
267 return (AE_NO_MEMORY);
268 }
269
270 new_buf = (char *) return_desc->buffer.pointer;
271
272 /* Convert the first integer */
273
274 this_integer = obj_desc1->integer.value;
275 for (i = 0; i < acpi_gbl_integer_byte_width; i++) {
276 new_buf[i] = (char) this_integer;
277 this_integer >>= 8;
278 }
279
280 /* Convert the second integer */
281
282 this_integer = obj_desc2->integer.value;
283 for (; i < (ACPI_MUL_2 (acpi_gbl_integer_byte_width)); i++) {
284 new_buf[i] = (char) this_integer;
285 this_integer >>= 8;
286 }
287
288 break;
289
290
291 case ACPI_TYPE_STRING:
292
293 /* Result of two Strings is a String */
294
295 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_STRING);
296 if (!return_desc) {
297 return (AE_NO_MEMORY);
298 }
299
300 /* Operand0 is string */
301
302 new_buf = ACPI_MEM_CALLOCATE ((acpi_size) obj_desc1->string.length +
303 (acpi_size) obj_desc2->string.length + 1);
304 if (!new_buf) {
305 ACPI_REPORT_ERROR
306 (("ex_do_concatenate: String allocation failure\n"));
307 status = AE_NO_MEMORY;
308 goto cleanup;
309 }
310
311 /* Concatenate the strings */
312
313 ACPI_STRCPY (new_buf, obj_desc1->string.pointer);
314 ACPI_STRCPY (new_buf + obj_desc1->string.length,
315 obj_desc2->string.pointer);
316
317 /* Complete the String object initialization */
318
319 return_desc->string.pointer = new_buf;
320 return_desc->string.length = obj_desc1->string.length +
321 obj_desc2->string.length;
322 break;
323
324
325 case ACPI_TYPE_BUFFER:
326
327 /* Result of two Buffers is a Buffer */
328
329 return_desc = acpi_ut_create_buffer_object (
330 (acpi_size) obj_desc1->buffer.length +
331 (acpi_size) obj_desc2->buffer.length);
332 if (!return_desc) {
333 return (AE_NO_MEMORY);
334 }
335
336 new_buf = (char *) return_desc->buffer.pointer;
337
338 /* Concatenate the buffers */
339
340 ACPI_MEMCPY (new_buf, obj_desc1->buffer.pointer,
341 obj_desc1->buffer.length);
342 ACPI_MEMCPY (new_buf + obj_desc1->buffer.length, obj_desc2->buffer.pointer,
343 obj_desc2->buffer.length);
344
345 break;
346
347
348 default:
349
350 /* Invalid object type, should not happen here */
351
352 ACPI_REPORT_ERROR (("Concat - invalid obj type: %X\n",
353 ACPI_GET_OBJECT_TYPE (obj_desc1)));
354 status = AE_AML_INTERNAL;
355 return_desc = NULL;
356 }
357
358 *actual_return_desc = return_desc;
359 return (AE_OK);
360
361
362 cleanup:
363
364 acpi_ut_remove_reference (return_desc);
365 return (status);
366 }
367
368
369 /*******************************************************************************
370 *
371 * FUNCTION: acpi_ex_do_math_op
372 *
373 * PARAMETERS: Opcode - AML opcode
374 * Operand0 - Integer operand #0
375 * Operand1 - Integer operand #1
376 *
377 * RETURN: Integer result of the operation
378 *
379 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
380 * math functions here is to prevent a lot of pointer dereferencing
381 * to obtain the operands.
382 *
383 ******************************************************************************/
384
385 acpi_integer
acpi_ex_do_math_op(u16 opcode,acpi_integer operand0,acpi_integer operand1)386 acpi_ex_do_math_op (
387 u16 opcode,
388 acpi_integer operand0,
389 acpi_integer operand1)
390 {
391
392
393 switch (opcode) {
394 case AML_ADD_OP: /* Add (Operand0, Operand1, Result) */
395
396 return (operand0 + operand1);
397
398
399 case AML_BIT_AND_OP: /* And (Operand0, Operand1, Result) */
400
401 return (operand0 & operand1);
402
403
404 case AML_BIT_NAND_OP: /* NAnd (Operand0, Operand1, Result) */
405
406 return (~(operand0 & operand1));
407
408
409 case AML_BIT_OR_OP: /* Or (Operand0, Operand1, Result) */
410
411 return (operand0 | operand1);
412
413
414 case AML_BIT_NOR_OP: /* NOr (Operand0, Operand1, Result) */
415
416 return (~(operand0 | operand1));
417
418
419 case AML_BIT_XOR_OP: /* XOr (Operand0, Operand1, Result) */
420
421 return (operand0 ^ operand1);
422
423
424 case AML_MULTIPLY_OP: /* Multiply (Operand0, Operand1, Result) */
425
426 return (operand0 * operand1);
427
428
429 case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result) */
430
431 return (operand0 << operand1);
432
433
434 case AML_SHIFT_RIGHT_OP: /* shift_right (Operand, shift_count, Result) */
435
436 return (operand0 >> operand1);
437
438
439 case AML_SUBTRACT_OP: /* Subtract (Operand0, Operand1, Result) */
440
441 return (operand0 - operand1);
442
443 default:
444
445 return (0);
446 }
447 }
448
449
450 /*******************************************************************************
451 *
452 * FUNCTION: acpi_ex_do_logical_op
453 *
454 * PARAMETERS: Opcode - AML opcode
455 * Operand0 - Integer operand #0
456 * Operand1 - Integer operand #1
457 *
458 * RETURN: TRUE/FALSE result of the operation
459 *
460 * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
461 * functions here is to prevent a lot of pointer dereferencing
462 * to obtain the operands and to simplify the generation of the
463 * logical value.
464 *
465 * Note: cleanest machine code seems to be produced by the code
466 * below, rather than using statements of the form:
467 * Result = (Operand0 == Operand1);
468 *
469 ******************************************************************************/
470
471 u8
acpi_ex_do_logical_op(u16 opcode,acpi_integer operand0,acpi_integer operand1)472 acpi_ex_do_logical_op (
473 u16 opcode,
474 acpi_integer operand0,
475 acpi_integer operand1)
476 {
477
478
479 switch (opcode) {
480
481 case AML_LAND_OP: /* LAnd (Operand0, Operand1) */
482
483 if (operand0 && operand1) {
484 return (TRUE);
485 }
486 break;
487
488
489 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
490
491 if (operand0 == operand1) {
492 return (TRUE);
493 }
494 break;
495
496
497 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
498
499 if (operand0 > operand1) {
500 return (TRUE);
501 }
502 break;
503
504
505 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
506
507 if (operand0 < operand1) {
508 return (TRUE);
509 }
510 break;
511
512
513 case AML_LOR_OP: /* LOr (Operand0, Operand1) */
514
515 if (operand0 || operand1) {
516 return (TRUE);
517 }
518 break;
519
520 default:
521 break;
522 }
523
524 return (FALSE);
525 }
526
527
528