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Merge tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux
[linux-2.6.git] / drivers / acpi / acpica / dswload.c
blob95e681a36f9c28d820b40f55d211426ae4b2de92
1 /******************************************************************************
2 *
3 * Module Name: dswload - Dispatcher first pass namespace load callbacks
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, Intel Corp.
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 "accommon.h"
46 #include "acparser.h"
47 #include "amlcode.h"
48 #include "acdispat.h"
49 #include "acinterp.h"
50 #include "acnamesp.h"
51
52 #ifdef ACPI_ASL_COMPILER
53 #include "acdisasm.h"
54 #endif
55
56 #define _COMPONENT ACPI_DISPATCHER
57 ACPI_MODULE_NAME("dswload")
58
59 /*******************************************************************************
60 *
61 * FUNCTION: acpi_ds_init_callbacks
62 *
63 * PARAMETERS: walk_state - Current state of the parse tree walk
64 * pass_number - 1, 2, or 3
65 *
66 * RETURN: Status
67 *
68 * DESCRIPTION: Init walk state callbacks
69 *
70 ******************************************************************************/
71 acpi_status
72 acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number)
73 {
74
75 switch (pass_number) {
76 case 1:
77
78 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
79 ACPI_PARSE_DELETE_TREE;
80 walk_state->descending_callback = acpi_ds_load1_begin_op;
81 walk_state->ascending_callback = acpi_ds_load1_end_op;
82 break;
83
84 case 2:
85
86 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
87 ACPI_PARSE_DELETE_TREE;
88 walk_state->descending_callback = acpi_ds_load2_begin_op;
89 walk_state->ascending_callback = acpi_ds_load2_end_op;
90 break;
91
92 case 3:
93
94 #ifndef ACPI_NO_METHOD_EXECUTION
95 walk_state->parse_flags |= ACPI_PARSE_EXECUTE |
96 ACPI_PARSE_DELETE_TREE;
97 walk_state->descending_callback = acpi_ds_exec_begin_op;
98 walk_state->ascending_callback = acpi_ds_exec_end_op;
99 #endif
100 break;
101
102 default:
103
104 return (AE_BAD_PARAMETER);
105 }
106
107 return (AE_OK);
108 }
109
110 /*******************************************************************************
111 *
112 * FUNCTION: acpi_ds_load1_begin_op
113 *
114 * PARAMETERS: walk_state - Current state of the parse tree walk
115 * out_op - Where to return op if a new one is created
116 *
117 * RETURN: Status
118 *
119 * DESCRIPTION: Descending callback used during the loading of ACPI tables.
120 *
121 ******************************************************************************/
122
123 acpi_status
124 acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
125 union acpi_parse_object ** out_op)
126 {
127 union acpi_parse_object *op;
128 struct acpi_namespace_node *node;
129 acpi_status status;
130 acpi_object_type object_type;
131 char *path;
132 u32 flags;
133
134 ACPI_FUNCTION_TRACE(ds_load1_begin_op);
135
136 op = walk_state->op;
137 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
138 walk_state));
139
140 /* We are only interested in opcodes that have an associated name */
141
142 if (op) {
143 if (!(walk_state->op_info->flags & AML_NAMED)) {
144 *out_op = op;
145 return_ACPI_STATUS(AE_OK);
146 }
147
148 /* Check if this object has already been installed in the namespace */
149
150 if (op->common.node) {
151 *out_op = op;
152 return_ACPI_STATUS(AE_OK);
153 }
154 }
155
156 path = acpi_ps_get_next_namestring(&walk_state->parser_state);
157
158 /* Map the raw opcode into an internal object type */
159
160 object_type = walk_state->op_info->object_type;
161
162 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
163 "State=%p Op=%p [%s]\n", walk_state, op,
164 acpi_ut_get_type_name(object_type)));
165
166 switch (walk_state->opcode) {
167 case AML_SCOPE_OP:
168 /*
169 * The target name of the Scope() operator must exist at this point so
170 * that we can actually open the scope to enter new names underneath it.
171 * Allow search-to-root for single namesegs.
172 */
173 status =
174 acpi_ns_lookup(walk_state->scope_info, path, object_type,
175 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
176 walk_state, &(node));
177 #ifdef ACPI_ASL_COMPILER
178 if (status == AE_NOT_FOUND) {
179 /*
180 * Table disassembly:
181 * Target of Scope() not found. Generate an External for it, and
182 * insert the name into the namespace.
183 */
184 acpi_dm_add_to_external_list(op, path, ACPI_TYPE_DEVICE,
185 0);
186 status =
187 acpi_ns_lookup(walk_state->scope_info, path,
188 object_type, ACPI_IMODE_LOAD_PASS1,
189 ACPI_NS_SEARCH_PARENT, walk_state,
190 &node);
191 }
192 #endif
193 if (ACPI_FAILURE(status)) {
194 ACPI_ERROR_NAMESPACE(path, status);
195 return_ACPI_STATUS(status);
196 }
197
198 /*
199 * Check to make sure that the target is
200 * one of the opcodes that actually opens a scope
201 */
202 switch (node->type) {
203 case ACPI_TYPE_ANY:
204 case ACPI_TYPE_LOCAL_SCOPE: /* Scope */
205 case ACPI_TYPE_DEVICE:
206 case ACPI_TYPE_POWER:
207 case ACPI_TYPE_PROCESSOR:
208 case ACPI_TYPE_THERMAL:
209
210 /* These are acceptable types */
211 break;
212
213 case ACPI_TYPE_INTEGER:
214 case ACPI_TYPE_STRING:
215 case ACPI_TYPE_BUFFER:
216 /*
217 * These types we will allow, but we will change the type.
218 * This enables some existing code of the form:
219 *
220 * Name (DEB, 0)
221 * Scope (DEB) { ... }
222 *
223 * Note: silently change the type here. On the second pass,
224 * we will report a warning
225 */
226 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
227 "Type override - [%4.4s] had invalid type (%s) "
228 "for Scope operator, changed to type ANY\n",
229 acpi_ut_get_node_name(node),
230 acpi_ut_get_type_name(node->type)));
231
232 node->type = ACPI_TYPE_ANY;
233 walk_state->scope_info->common.value = ACPI_TYPE_ANY;
234 break;
235
236 case ACPI_TYPE_METHOD:
237 /*
238 * Allow scope change to root during execution of module-level
239 * code. Root is typed METHOD during this time.
240 */
241 if ((node == acpi_gbl_root_node) &&
242 (walk_state->
243 parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
244 break;
245 }
246
247 /*lint -fallthrough */
248
249 default:
250
251 /* All other types are an error */
252
253 ACPI_ERROR((AE_INFO,
254 "Invalid type (%s) for target of "
255 "Scope operator [%4.4s] (Cannot override)",
256 acpi_ut_get_type_name(node->type),
257 acpi_ut_get_node_name(node)));
258
259 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
260 }
261 break;
262
263 default:
264 /*
265 * For all other named opcodes, we will enter the name into
266 * the namespace.
267 *
268 * Setup the search flags.
269 * Since we are entering a name into the namespace, we do not want to
270 * enable the search-to-root upsearch.
271 *
272 * There are only two conditions where it is acceptable that the name
273 * already exists:
274 * 1) the Scope() operator can reopen a scoping object that was
275 * previously defined (Scope, Method, Device, etc.)
276 * 2) Whenever we are parsing a deferred opcode (op_region, Buffer,
277 * buffer_field, or Package), the name of the object is already
278 * in the namespace.
279 */
280 if (walk_state->deferred_node) {
281
282 /* This name is already in the namespace, get the node */
283
284 node = walk_state->deferred_node;
285 status = AE_OK;
286 break;
287 }
288
289 /*
290 * If we are executing a method, do not create any namespace objects
291 * during the load phase, only during execution.
292 */
293 if (walk_state->method_node) {
294 node = NULL;
295 status = AE_OK;
296 break;
297 }
298
299 flags = ACPI_NS_NO_UPSEARCH;
300 if ((walk_state->opcode != AML_SCOPE_OP) &&
301 (!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) {
302 flags |= ACPI_NS_ERROR_IF_FOUND;
303 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
304 "[%s] Cannot already exist\n",
305 acpi_ut_get_type_name(object_type)));
306 } else {
307 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
308 "[%s] Both Find or Create allowed\n",
309 acpi_ut_get_type_name(object_type)));
310 }
311
312 /*
313 * Enter the named type into the internal namespace. We enter the name
314 * as we go downward in the parse tree. Any necessary subobjects that
315 * involve arguments to the opcode must be created as we go back up the
316 * parse tree later.
317 */
318 status =
319 acpi_ns_lookup(walk_state->scope_info, path, object_type,
320 ACPI_IMODE_LOAD_PASS1, flags, walk_state,
321 &node);
322 if (ACPI_FAILURE(status)) {
323 if (status == AE_ALREADY_EXISTS) {
324
325 /* The name already exists in this scope */
326
327 if (node->flags & ANOBJ_IS_EXTERNAL) {
328 /*
329 * Allow one create on an object or segment that was
330 * previously declared External
331 */
332 node->flags &= ~ANOBJ_IS_EXTERNAL;
333 node->type = (u8) object_type;
334
335 /* Just retyped a node, probably will need to open a scope */
336
337 if (acpi_ns_opens_scope(object_type)) {
338 status =
339 acpi_ds_scope_stack_push
340 (node, object_type,
341 walk_state);
342 if (ACPI_FAILURE(status)) {
343 return_ACPI_STATUS
344 (status);
345 }
346 }
347
348 status = AE_OK;
349 }
350 }
351
352 if (ACPI_FAILURE(status)) {
353 ACPI_ERROR_NAMESPACE(path, status);
354 return_ACPI_STATUS(status);
355 }
356 }
357 break;
358 }
359
360 /* Common exit */
361
362 if (!op) {
363
364 /* Create a new op */
365
366 op = acpi_ps_alloc_op(walk_state->opcode);
367 if (!op) {
368 return_ACPI_STATUS(AE_NO_MEMORY);
369 }
370 }
371
372 /* Initialize the op */
373
374 #if (defined (ACPI_NO_METHOD_EXECUTION) || defined (ACPI_CONSTANT_EVAL_ONLY))
375 op->named.path = ACPI_CAST_PTR(u8, path);
376 #endif
377
378 if (node) {
379 /*
380 * Put the Node in the "op" object that the parser uses, so we
381 * can get it again quickly when this scope is closed
382 */
383 op->common.node = node;
384 op->named.name = node->name.integer;
385 }
386
387 acpi_ps_append_arg(acpi_ps_get_parent_scope(&walk_state->parser_state),
388 op);
389 *out_op = op;
390 return_ACPI_STATUS(status);
391 }
392
393 /*******************************************************************************
394 *
395 * FUNCTION: acpi_ds_load1_end_op
396 *
397 * PARAMETERS: walk_state - Current state of the parse tree walk
398 *
399 * RETURN: Status
400 *
401 * DESCRIPTION: Ascending callback used during the loading of the namespace,
402 * both control methods and everything else.
403 *
404 ******************************************************************************/
405
406 acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
407 {
408 union acpi_parse_object *op;
409 acpi_object_type object_type;
410 acpi_status status = AE_OK;
411
412 ACPI_FUNCTION_TRACE(ds_load1_end_op);
413
414 op = walk_state->op;
415 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
416 walk_state));
417
418 /* We are only interested in opcodes that have an associated name */
419
420 if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {
421 return_ACPI_STATUS(AE_OK);
422 }
423
424 /* Get the object type to determine if we should pop the scope */
425
426 object_type = walk_state->op_info->object_type;
427
428 #ifndef ACPI_NO_METHOD_EXECUTION
429 if (walk_state->op_info->flags & AML_FIELD) {
430 /*
431 * If we are executing a method, do not create any namespace objects
432 * during the load phase, only during execution.
433 */
434 if (!walk_state->method_node) {
435 if (walk_state->opcode == AML_FIELD_OP ||
436 walk_state->opcode == AML_BANK_FIELD_OP ||
437 walk_state->opcode == AML_INDEX_FIELD_OP) {
438 status =
439 acpi_ds_init_field_objects(op, walk_state);
440 }
441 }
442 return_ACPI_STATUS(status);
443 }
444
445 /*
446 * If we are executing a method, do not create any namespace objects
447 * during the load phase, only during execution.
448 */
449 if (!walk_state->method_node) {
450 if (op->common.aml_opcode == AML_REGION_OP) {
451 status =
452 acpi_ex_create_region(op->named.data,
453 op->named.length,
454 (acpi_adr_space_type) ((op->
455 common.
456 value.
457 arg)->
458 common.
459 value.
460 integer),
461 walk_state);
462 if (ACPI_FAILURE(status)) {
463 return_ACPI_STATUS(status);
464 }
465 } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
466 status =
467 acpi_ex_create_region(op->named.data,
468 op->named.length,
469 ACPI_ADR_SPACE_DATA_TABLE,
470 walk_state);
471 if (ACPI_FAILURE(status)) {
472 return_ACPI_STATUS(status);
473 }
474 }
475 }
476 #endif
477
478 if (op->common.aml_opcode == AML_NAME_OP) {
479
480 /* For Name opcode, get the object type from the argument */
481
482 if (op->common.value.arg) {
483 object_type = (acpi_ps_get_opcode_info((op->common.
484 value.arg)->
485 common.
486 aml_opcode))->
487 object_type;
488
489 /* Set node type if we have a namespace node */
490
491 if (op->common.node) {
492 op->common.node->type = (u8) object_type;
493 }
494 }
495 }
496
497 /*
498 * If we are executing a method, do not create any namespace objects
499 * during the load phase, only during execution.
500 */
501 if (!walk_state->method_node) {
502 if (op->common.aml_opcode == AML_METHOD_OP) {
503 /*
504 * method_op pkg_length name_string method_flags term_list
505 *
506 * Note: We must create the method node/object pair as soon as we
507 * see the method declaration. This allows later pass1 parsing
508 * of invocations of the method (need to know the number of
509 * arguments.)
510 */
511 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
512 "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
513 walk_state, op, op->named.node));
514
515 if (!acpi_ns_get_attached_object(op->named.node)) {
516 walk_state->operands[0] =
517 ACPI_CAST_PTR(void, op->named.node);
518 walk_state->num_operands = 1;
519
520 status =
521 acpi_ds_create_operands(walk_state,
522 op->common.value.
523 arg);
524 if (ACPI_SUCCESS(status)) {
525 status =
526 acpi_ex_create_method(op->named.
527 data,
528 op->named.
529 length,
530 walk_state);
531 }
532
533 walk_state->operands[0] = NULL;
534 walk_state->num_operands = 0;
535
536 if (ACPI_FAILURE(status)) {
537 return_ACPI_STATUS(status);
538 }
539 }
540 }
541 }
542
543 /* Pop the scope stack (only if loading a table) */
544
545 if (!walk_state->method_node && acpi_ns_opens_scope(object_type)) {
546 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
547 "(%s): Popping scope for Op %p\n",
548 acpi_ut_get_type_name(object_type), op));
549
550 status = acpi_ds_scope_stack_pop(walk_state);
551 }
552
553 return_ACPI_STATUS(status);
554 }
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