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ACPI: Make _OSI(Linux) a special case
[pv_ops_mirror.git] / drivers / acpi / dispatcher / dsfield.c
blobf049639bac355db3e6996505037624d0e742e92b
1 /******************************************************************************
2 *
3 * Module Name: dsfield - Dispatcher field routines
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2007, R. Byron Moore
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
44 #include <acpi/acpi.h>
45 #include <acpi/amlcode.h>
46 #include <acpi/acdispat.h>
47 #include <acpi/acinterp.h>
48 #include <acpi/acnamesp.h>
49 #include <acpi/acparser.h>
50
51 #define _COMPONENT ACPI_DISPATCHER
52 ACPI_MODULE_NAME("dsfield")
53
54 /* Local prototypes */
55 static acpi_status
56 acpi_ds_get_field_names(struct acpi_create_field_info *info,
57 struct acpi_walk_state *walk_state,
58 union acpi_parse_object *arg);
59
60 /*******************************************************************************
61 *
62 * FUNCTION: acpi_ds_create_buffer_field
63 *
64 * PARAMETERS: Op - Current parse op (create_xXField)
65 * walk_state - Current state
66 *
67 * RETURN: Status
68 *
69 * DESCRIPTION: Execute the create_field operators:
70 * create_bit_field_op,
71 * create_byte_field_op,
72 * create_word_field_op,
73 * create_dword_field_op,
74 * create_qword_field_op,
75 * create_field_op (all of which define a field in a buffer)
76 *
77 ******************************************************************************/
78
79 acpi_status
80 acpi_ds_create_buffer_field(union acpi_parse_object *op,
81 struct acpi_walk_state *walk_state)
82 {
83 union acpi_parse_object *arg;
84 struct acpi_namespace_node *node;
85 acpi_status status;
86 union acpi_operand_object *obj_desc;
87 union acpi_operand_object *second_desc = NULL;
88 u32 flags;
89
90 ACPI_FUNCTION_TRACE(ds_create_buffer_field);
91
92 /* Get the name_string argument */
93
94 if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
95 arg = acpi_ps_get_arg(op, 3);
96 } else {
97 /* Create Bit/Byte/Word/Dword field */
98
99 arg = acpi_ps_get_arg(op, 2);
100 }
101
102 if (!arg) {
103 return_ACPI_STATUS(AE_AML_NO_OPERAND);
104 }
105
106 if (walk_state->deferred_node) {
107 node = walk_state->deferred_node;
108 status = AE_OK;
109 } else {
110 /*
111 * During the load phase, we want to enter the name of the field into
112 * the namespace. During the execute phase (when we evaluate the size
113 * operand), we want to lookup the name
114 */
115 if (walk_state->parse_flags & ACPI_PARSE_EXECUTE) {
116 flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE;
117 } else {
118 flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
119 ACPI_NS_ERROR_IF_FOUND;
120 }
121
122 /*
123 * Enter the name_string into the namespace
124 */
125 status =
126 acpi_ns_lookup(walk_state->scope_info,
127 arg->common.value.string, ACPI_TYPE_ANY,
128 ACPI_IMODE_LOAD_PASS1, flags, walk_state,
129 &(node));
130 if (ACPI_FAILURE(status)) {
131 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
132 return_ACPI_STATUS(status);
133 }
134 }
135
136 /*
137 * We could put the returned object (Node) on the object stack for later,
138 * but for now, we will put it in the "op" object that the parser uses,
139 * so we can get it again at the end of this scope
140 */
141 op->common.node = node;
142
143 /*
144 * If there is no object attached to the node, this node was just created
145 * and we need to create the field object. Otherwise, this was a lookup
146 * of an existing node and we don't want to create the field object again.
147 */
148 obj_desc = acpi_ns_get_attached_object(node);
149 if (obj_desc) {
150 return_ACPI_STATUS(AE_OK);
151 }
152
153 /*
154 * The Field definition is not fully parsed at this time.
155 * (We must save the address of the AML for the buffer and index operands)
156 */
157
158 /* Create the buffer field object */
159
160 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER_FIELD);
161 if (!obj_desc) {
162 status = AE_NO_MEMORY;
163 goto cleanup;
164 }
165
166 /*
167 * Remember location in AML stream of the field unit
168 * opcode and operands -- since the buffer and index
169 * operands must be evaluated.
170 */
171 second_desc = obj_desc->common.next_object;
172 second_desc->extra.aml_start = op->named.data;
173 second_desc->extra.aml_length = op->named.length;
174 obj_desc->buffer_field.node = node;
175
176 /* Attach constructed field descriptors to parent node */
177
178 status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_BUFFER_FIELD);
179 if (ACPI_FAILURE(status)) {
180 goto cleanup;
181 }
182
183 cleanup:
184
185 /* Remove local reference to the object */
186
187 acpi_ut_remove_reference(obj_desc);
188 return_ACPI_STATUS(status);
189 }
190
191 /*******************************************************************************
192 *
193 * FUNCTION: acpi_ds_get_field_names
194 *
195 * PARAMETERS: Info - create_field info structure
196 * ` walk_state - Current method state
197 * Arg - First parser arg for the field name list
198 *
199 * RETURN: Status
200 *
201 * DESCRIPTION: Process all named fields in a field declaration. Names are
202 * entered into the namespace.
203 *
204 ******************************************************************************/
205
206 static acpi_status
207 acpi_ds_get_field_names(struct acpi_create_field_info *info,
208 struct acpi_walk_state *walk_state,
209 union acpi_parse_object *arg)
210 {
211 acpi_status status;
212 acpi_integer position;
213
214 ACPI_FUNCTION_TRACE_PTR(ds_get_field_names, info);
215
216 /* First field starts at bit zero */
217
218 info->field_bit_position = 0;
219
220 /* Process all elements in the field list (of parse nodes) */
221
222 while (arg) {
223 /*
224 * Three types of field elements are handled:
225 * 1) Offset - specifies a bit offset
226 * 2) access_as - changes the access mode
227 * 3) Name - Enters a new named field into the namespace
228 */
229 switch (arg->common.aml_opcode) {
230 case AML_INT_RESERVEDFIELD_OP:
231
232 position = (acpi_integer) info->field_bit_position
233 + (acpi_integer) arg->common.value.size;
234
235 if (position > ACPI_UINT32_MAX) {
236 ACPI_ERROR((AE_INFO,
237 "Bit offset within field too large (> 0xFFFFFFFF)"));
238 return_ACPI_STATUS(AE_SUPPORT);
239 }
240
241 info->field_bit_position = (u32) position;
242 break;
243
244 case AML_INT_ACCESSFIELD_OP:
245
246 /*
247 * Get a new access_type and access_attribute -- to be used for all
248 * field units that follow, until field end or another access_as
249 * keyword.
250 *
251 * In field_flags, preserve the flag bits other than the
252 * ACCESS_TYPE bits
253 */
254 info->field_flags = (u8)
255 ((info->
256 field_flags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
257 ((u8) ((u32) arg->common.value.integer >> 8)));
258
259 info->attribute = (u8) (arg->common.value.integer);
260 break;
261
262 case AML_INT_NAMEDFIELD_OP:
263
264 /* Lookup the name */
265
266 status = acpi_ns_lookup(walk_state->scope_info,
267 (char *)&arg->named.name,
268 info->field_type,
269 ACPI_IMODE_EXECUTE,
270 ACPI_NS_DONT_OPEN_SCOPE,
271 walk_state, &info->field_node);
272 if (ACPI_FAILURE(status)) {
273 ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
274 status);
275 if (status != AE_ALREADY_EXISTS) {
276 return_ACPI_STATUS(status);
277 }
278
279 /* Already exists, ignore error */
280 } else {
281 arg->common.node = info->field_node;
282 info->field_bit_length = arg->common.value.size;
283
284 /* Create and initialize an object for the new Field Node */
285
286 status = acpi_ex_prep_field_value(info);
287 if (ACPI_FAILURE(status)) {
288 return_ACPI_STATUS(status);
289 }
290 }
291
292 /* Keep track of bit position for the next field */
293
294 position = (acpi_integer) info->field_bit_position
295 + (acpi_integer) arg->common.value.size;
296
297 if (position > ACPI_UINT32_MAX) {
298 ACPI_ERROR((AE_INFO,
299 "Field [%4.4s] bit offset too large (> 0xFFFFFFFF)",
300 ACPI_CAST_PTR(char,
301 &info->field_node->
302 name)));
303 return_ACPI_STATUS(AE_SUPPORT);
304 }
305
306 info->field_bit_position += info->field_bit_length;
307 break;
308
309 default:
310
311 ACPI_ERROR((AE_INFO,
312 "Invalid opcode in field list: %X",
313 arg->common.aml_opcode));
314 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
315 }
316
317 arg = arg->common.next;
318 }
319
320 return_ACPI_STATUS(AE_OK);
321 }
322
323 /*******************************************************************************
324 *
325 * FUNCTION: acpi_ds_create_field
326 *
327 * PARAMETERS: Op - Op containing the Field definition and args
328 * region_node - Object for the containing Operation Region
329 * ` walk_state - Current method state
330 *
331 * RETURN: Status
332 *
333 * DESCRIPTION: Create a new field in the specified operation region
334 *
335 ******************************************************************************/
336
337 acpi_status
338 acpi_ds_create_field(union acpi_parse_object *op,
339 struct acpi_namespace_node *region_node,
340 struct acpi_walk_state *walk_state)
341 {
342 acpi_status status;
343 union acpi_parse_object *arg;
344 struct acpi_create_field_info info;
345
346 ACPI_FUNCTION_TRACE_PTR(ds_create_field, op);
347
348 /* First arg is the name of the parent op_region (must already exist) */
349
350 arg = op->common.value.arg;
351 if (!region_node) {
352 status =
353 acpi_ns_lookup(walk_state->scope_info,
354 arg->common.value.name, ACPI_TYPE_REGION,
355 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
356 walk_state, &region_node);
357 if (ACPI_FAILURE(status)) {
358 ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
359 return_ACPI_STATUS(status);
360 }
361 }
362
363 /* Second arg is the field flags */
364
365 arg = arg->common.next;
366 info.field_flags = (u8) arg->common.value.integer;
367 info.attribute = 0;
368
369 /* Each remaining arg is a Named Field */
370
371 info.field_type = ACPI_TYPE_LOCAL_REGION_FIELD;
372 info.region_node = region_node;
373
374 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
375
376 return_ACPI_STATUS(status);
377 }
378
379 /*******************************************************************************
380 *
381 * FUNCTION: acpi_ds_init_field_objects
382 *
383 * PARAMETERS: Op - Op containing the Field definition and args
384 * ` walk_state - Current method state
385 *
386 * RETURN: Status
387 *
388 * DESCRIPTION: For each "Field Unit" name in the argument list that is
389 * part of the field declaration, enter the name into the
390 * namespace.
391 *
392 ******************************************************************************/
393
394 acpi_status
395 acpi_ds_init_field_objects(union acpi_parse_object *op,
396 struct acpi_walk_state *walk_state)
397 {
398 acpi_status status;
399 union acpi_parse_object *arg = NULL;
400 struct acpi_namespace_node *node;
401 u8 type = 0;
402
403 ACPI_FUNCTION_TRACE_PTR(ds_init_field_objects, op);
404
405 switch (walk_state->opcode) {
406 case AML_FIELD_OP:
407 arg = acpi_ps_get_arg(op, 2);
408 type = ACPI_TYPE_LOCAL_REGION_FIELD;
409 break;
410
411 case AML_BANK_FIELD_OP:
412 arg = acpi_ps_get_arg(op, 4);
413 type = ACPI_TYPE_LOCAL_BANK_FIELD;
414 break;
415
416 case AML_INDEX_FIELD_OP:
417 arg = acpi_ps_get_arg(op, 3);
418 type = ACPI_TYPE_LOCAL_INDEX_FIELD;
419 break;
420
421 default:
422 return_ACPI_STATUS(AE_BAD_PARAMETER);
423 }
424
425 /*
426 * Walk the list of entries in the field_list
427 */
428 while (arg) {
429
430 /* Ignore OFFSET and ACCESSAS terms here */
431
432 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
433 status = acpi_ns_lookup(walk_state->scope_info,
434 (char *)&arg->named.name,
435 type, ACPI_IMODE_LOAD_PASS1,
436 ACPI_NS_NO_UPSEARCH |
437 ACPI_NS_DONT_OPEN_SCOPE |
438 ACPI_NS_ERROR_IF_FOUND,
439 walk_state, &node);
440 if (ACPI_FAILURE(status)) {
441 ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
442 status);
443 if (status != AE_ALREADY_EXISTS) {
444 return_ACPI_STATUS(status);
445 }
446
447 /* Name already exists, just ignore this error */
448
449 status = AE_OK;
450 }
451
452 arg->common.node = node;
453 }
454
455 /* Move to next field in the list */
456
457 arg = arg->common.next;
458 }
459
460 return_ACPI_STATUS(AE_OK);
461 }
462
463 /*******************************************************************************
464 *
465 * FUNCTION: acpi_ds_create_bank_field
466 *
467 * PARAMETERS: Op - Op containing the Field definition and args
468 * region_node - Object for the containing Operation Region
469 * ` walk_state - Current method state
470 *
471 * RETURN: Status
472 *
473 * DESCRIPTION: Create a new bank field in the specified operation region
474 *
475 ******************************************************************************/
476
477 acpi_status
478 acpi_ds_create_bank_field(union acpi_parse_object *op,
479 struct acpi_namespace_node *region_node,
480 struct acpi_walk_state *walk_state)
481 {
482 acpi_status status;
483 union acpi_parse_object *arg;
484 struct acpi_create_field_info info;
485
486 ACPI_FUNCTION_TRACE_PTR(ds_create_bank_field, op);
487
488 /* First arg is the name of the parent op_region (must already exist) */
489
490 arg = op->common.value.arg;
491 if (!region_node) {
492 status =
493 acpi_ns_lookup(walk_state->scope_info,
494 arg->common.value.name, ACPI_TYPE_REGION,
495 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
496 walk_state, &region_node);
497 if (ACPI_FAILURE(status)) {
498 ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
499 return_ACPI_STATUS(status);
500 }
501 }
502
503 /* Second arg is the Bank Register (Field) (must already exist) */
504
505 arg = arg->common.next;
506 status =
507 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
508 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
509 ACPI_NS_SEARCH_PARENT, walk_state,
510 &info.register_node);
511 if (ACPI_FAILURE(status)) {
512 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
513 return_ACPI_STATUS(status);
514 }
515
516 /* Third arg is the bank_value */
517
518 /* TBD: This arg is a term_arg, not a constant, and must be evaluated */
519
520 arg = arg->common.next;
521
522 /* Currently, only the following constants are supported */
523
524 switch (arg->common.aml_opcode) {
525 case AML_ZERO_OP:
526 info.bank_value = 0;
527 break;
528
529 case AML_ONE_OP:
530 info.bank_value = 1;
531 break;
532
533 case AML_BYTE_OP:
534 case AML_WORD_OP:
535 case AML_DWORD_OP:
536 case AML_QWORD_OP:
537 info.bank_value = (u32) arg->common.value.integer;
538 break;
539
540 default:
541 info.bank_value = 0;
542 ACPI_ERROR((AE_INFO,
543 "Non-constant BankValue for BankField is not implemented"));
544 }
545
546 /* Fourth arg is the field flags */
547
548 arg = arg->common.next;
549 info.field_flags = (u8) arg->common.value.integer;
550
551 /* Each remaining arg is a Named Field */
552
553 info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
554 info.region_node = region_node;
555
556 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
557
558 return_ACPI_STATUS(status);
559 }
560
561 /*******************************************************************************
562 *
563 * FUNCTION: acpi_ds_create_index_field
564 *
565 * PARAMETERS: Op - Op containing the Field definition and args
566 * region_node - Object for the containing Operation Region
567 * ` walk_state - Current method state
568 *
569 * RETURN: Status
570 *
571 * DESCRIPTION: Create a new index field in the specified operation region
572 *
573 ******************************************************************************/
574
575 acpi_status
576 acpi_ds_create_index_field(union acpi_parse_object *op,
577 struct acpi_namespace_node *region_node,
578 struct acpi_walk_state *walk_state)
579 {
580 acpi_status status;
581 union acpi_parse_object *arg;
582 struct acpi_create_field_info info;
583
584 ACPI_FUNCTION_TRACE_PTR(ds_create_index_field, op);
585
586 /* First arg is the name of the Index register (must already exist) */
587
588 arg = op->common.value.arg;
589 status =
590 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
591 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
592 ACPI_NS_SEARCH_PARENT, walk_state,
593 &info.register_node);
594 if (ACPI_FAILURE(status)) {
595 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
596 return_ACPI_STATUS(status);
597 }
598
599 /* Second arg is the data register (must already exist) */
600
601 arg = arg->common.next;
602 status =
603 acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
604 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
605 ACPI_NS_SEARCH_PARENT, walk_state,
606 &info.data_register_node);
607 if (ACPI_FAILURE(status)) {
608 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
609 return_ACPI_STATUS(status);
610 }
611
612 /* Next arg is the field flags */
613
614 arg = arg->common.next;
615 info.field_flags = (u8) arg->common.value.integer;
616
617 /* Each remaining arg is a Named Field */
618
619 info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
620 info.region_node = region_node;
621
622 status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
623
624 return_ACPI_STATUS(status);
625 }
Mirror for ia64_pv_ops.git