Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / acpica / dswload.c
1 /******************************************************************************
2  *
3  * Module Name: dswload - Dispatcher first pass namespace load callbacks
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2012, 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 <acpi/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                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
78                     ACPI_PARSE_DELETE_TREE;
79                 walk_state->descending_callback = acpi_ds_load1_begin_op;
80                 walk_state->ascending_callback = acpi_ds_load1_end_op;
81                 break;
82
83         case 2:
84                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
85                     ACPI_PARSE_DELETE_TREE;
86                 walk_state->descending_callback = acpi_ds_load2_begin_op;
87                 walk_state->ascending_callback = acpi_ds_load2_end_op;
88                 break;
89
90         case 3:
91 #ifndef ACPI_NO_METHOD_EXECUTION
92                 walk_state->parse_flags |= ACPI_PARSE_EXECUTE |
93                     ACPI_PARSE_DELETE_TREE;
94                 walk_state->descending_callback = acpi_ds_exec_begin_op;
95                 walk_state->ascending_callback = acpi_ds_exec_end_op;
96 #endif
97                 break;
98
99         default:
100                 return (AE_BAD_PARAMETER);
101         }
102
103         return (AE_OK);
104 }
105
106 /*******************************************************************************
107  *
108  * FUNCTION:    acpi_ds_load1_begin_op
109  *
110  * PARAMETERS:  walk_state      - Current state of the parse tree walk
111  *              out_op          - Where to return op if a new one is created
112  *
113  * RETURN:      Status
114  *
115  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
116  *
117  ******************************************************************************/
118
119 acpi_status
120 acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
121                        union acpi_parse_object ** out_op)
122 {
123         union acpi_parse_object *op;
124         struct acpi_namespace_node *node;
125         acpi_status status;
126         acpi_object_type object_type;
127         char *path;
128         u32 flags;
129
130         ACPI_FUNCTION_TRACE(ds_load1_begin_op);
131
132         op = walk_state->op;
133         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
134                           walk_state));
135
136         /* We are only interested in opcodes that have an associated name */
137
138         if (op) {
139                 if (!(walk_state->op_info->flags & AML_NAMED)) {
140                         *out_op = op;
141                         return_ACPI_STATUS(AE_OK);
142                 }
143
144                 /* Check if this object has already been installed in the namespace */
145
146                 if (op->common.node) {
147                         *out_op = op;
148                         return_ACPI_STATUS(AE_OK);
149                 }
150         }
151
152         path = acpi_ps_get_next_namestring(&walk_state->parser_state);
153
154         /* Map the raw opcode into an internal object type */
155
156         object_type = walk_state->op_info->object_type;
157
158         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
159                           "State=%p Op=%p [%s]\n", walk_state, op,
160                           acpi_ut_get_type_name(object_type)));
161
162         switch (walk_state->opcode) {
163         case AML_SCOPE_OP:
164
165                 /*
166                  * The target name of the Scope() operator must exist at this point so
167                  * that we can actually open the scope to enter new names underneath it.
168                  * Allow search-to-root for single namesegs.
169                  */
170                 status =
171                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
172                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
173                                    walk_state, &(node));
174 #ifdef ACPI_ASL_COMPILER
175                 if (status == AE_NOT_FOUND) {
176                         /*
177                          * Table disassembly:
178                          * Target of Scope() not found. Generate an External for it, and
179                          * insert the name into the namespace.
180                          */
181                         acpi_dm_add_to_external_list(path, ACPI_TYPE_DEVICE, 0);
182                         status =
183                             acpi_ns_lookup(walk_state->scope_info, path,
184                                            object_type, ACPI_IMODE_LOAD_PASS1,
185                                            ACPI_NS_SEARCH_PARENT, walk_state,
186                                            &node);
187                 }
188 #endif
189                 if (ACPI_FAILURE(status)) {
190                         ACPI_ERROR_NAMESPACE(path, status);
191                         return_ACPI_STATUS(status);
192                 }
193
194                 /*
195                  * Check to make sure that the target is
196                  * one of the opcodes that actually opens a scope
197                  */
198                 switch (node->type) {
199                 case ACPI_TYPE_ANY:
200                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope  */
201                 case ACPI_TYPE_DEVICE:
202                 case ACPI_TYPE_POWER:
203                 case ACPI_TYPE_PROCESSOR:
204                 case ACPI_TYPE_THERMAL:
205
206                         /* These are acceptable types */
207                         break;
208
209                 case ACPI_TYPE_INTEGER:
210                 case ACPI_TYPE_STRING:
211                 case ACPI_TYPE_BUFFER:
212
213                         /*
214                          * These types we will allow, but we will change the type.
215                          * This enables some existing code of the form:
216                          *
217                          *  Name (DEB, 0)
218                          *  Scope (DEB) { ... }
219                          *
220                          * Note: silently change the type here. On the second pass,
221                          * we will report a warning
222                          */
223                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
224                                           "Type override - [%4.4s] had invalid type (%s) "
225                                           "for Scope operator, changed to type ANY\n",
226                                           acpi_ut_get_node_name(node),
227                                           acpi_ut_get_type_name(node->type)));
228
229                         node->type = ACPI_TYPE_ANY;
230                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
231                         break;
232
233                 default:
234
235                         /* All other types are an error */
236
237                         ACPI_ERROR((AE_INFO,
238                                     "Invalid type (%s) for target of "
239                                     "Scope operator [%4.4s] (Cannot override)",
240                                     acpi_ut_get_type_name(node->type),
241                                     acpi_ut_get_node_name(node)));
242
243                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
244                 }
245                 break;
246
247         default:
248                 /*
249                  * For all other named opcodes, we will enter the name into
250                  * the namespace.
251                  *
252                  * Setup the search flags.
253                  * Since we are entering a name into the namespace, we do not want to
254                  * enable the search-to-root upsearch.
255                  *
256                  * There are only two conditions where it is acceptable that the name
257                  * already exists:
258                  *    1) the Scope() operator can reopen a scoping object that was
259                  *       previously defined (Scope, Method, Device, etc.)
260                  *    2) Whenever we are parsing a deferred opcode (op_region, Buffer,
261                  *       buffer_field, or Package), the name of the object is already
262                  *       in the namespace.
263                  */
264                 if (walk_state->deferred_node) {
265
266                         /* This name is already in the namespace, get the node */
267
268                         node = walk_state->deferred_node;
269                         status = AE_OK;
270                         break;
271                 }
272
273                 /*
274                  * If we are executing a method, do not create any namespace objects
275                  * during the load phase, only during execution.
276                  */
277                 if (walk_state->method_node) {
278                         node = NULL;
279                         status = AE_OK;
280                         break;
281                 }
282
283                 flags = ACPI_NS_NO_UPSEARCH;
284                 if ((walk_state->opcode != AML_SCOPE_OP) &&
285                     (!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) {
286                         flags |= ACPI_NS_ERROR_IF_FOUND;
287                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
288                                           "[%s] Cannot already exist\n",
289                                           acpi_ut_get_type_name(object_type)));
290                 } else {
291                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
292                                           "[%s] Both Find or Create allowed\n",
293                                           acpi_ut_get_type_name(object_type)));
294                 }
295
296                 /*
297                  * Enter the named type into the internal namespace. We enter the name
298                  * as we go downward in the parse tree. Any necessary subobjects that
299                  * involve arguments to the opcode must be created as we go back up the
300                  * parse tree later.
301                  */
302                 status =
303                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
304                                    ACPI_IMODE_LOAD_PASS1, flags, walk_state,
305                                    &node);
306                 if (ACPI_FAILURE(status)) {
307                         if (status == AE_ALREADY_EXISTS) {
308
309                                 /* The name already exists in this scope */
310
311                                 if (node->flags & ANOBJ_IS_EXTERNAL) {
312                                         /*
313                                          * Allow one create on an object or segment that was
314                                          * previously declared External
315                                          */
316                                         node->flags &= ~ANOBJ_IS_EXTERNAL;
317                                         node->type = (u8) object_type;
318
319                                         /* Just retyped a node, probably will need to open a scope */
320
321                                         if (acpi_ns_opens_scope(object_type)) {
322                                                 status =
323                                                     acpi_ds_scope_stack_push
324                                                     (node, object_type,
325                                                      walk_state);
326                                                 if (ACPI_FAILURE(status)) {
327                                                         return_ACPI_STATUS
328                                                             (status);
329                                                 }
330                                         }
331
332                                         status = AE_OK;
333                                 }
334                         }
335
336                         if (ACPI_FAILURE(status)) {
337                                 ACPI_ERROR_NAMESPACE(path, status);
338                                 return_ACPI_STATUS(status);
339                         }
340                 }
341                 break;
342         }
343
344         /* Common exit */
345
346         if (!op) {
347
348                 /* Create a new op */
349
350                 op = acpi_ps_alloc_op(walk_state->opcode);
351                 if (!op) {
352                         return_ACPI_STATUS(AE_NO_MEMORY);
353                 }
354         }
355
356         /* Initialize the op */
357
358 #if (defined (ACPI_NO_METHOD_EXECUTION) || defined (ACPI_CONSTANT_EVAL_ONLY))
359         op->named.path = ACPI_CAST_PTR(u8, path);
360 #endif
361
362         if (node) {
363                 /*
364                  * Put the Node in the "op" object that the parser uses, so we
365                  * can get it again quickly when this scope is closed
366                  */
367                 op->common.node = node;
368                 op->named.name = node->name.integer;
369         }
370
371         acpi_ps_append_arg(acpi_ps_get_parent_scope(&walk_state->parser_state),
372                            op);
373         *out_op = op;
374         return_ACPI_STATUS(status);
375 }
376
377 /*******************************************************************************
378  *
379  * FUNCTION:    acpi_ds_load1_end_op
380  *
381  * PARAMETERS:  walk_state      - Current state of the parse tree walk
382  *
383  * RETURN:      Status
384  *
385  * DESCRIPTION: Ascending callback used during the loading of the namespace,
386  *              both control methods and everything else.
387  *
388  ******************************************************************************/
389
390 acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
391 {
392         union acpi_parse_object *op;
393         acpi_object_type object_type;
394         acpi_status status = AE_OK;
395
396         ACPI_FUNCTION_TRACE(ds_load1_end_op);
397
398         op = walk_state->op;
399         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
400                           walk_state));
401
402         /* We are only interested in opcodes that have an associated name */
403
404         if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {
405                 return_ACPI_STATUS(AE_OK);
406         }
407
408         /* Get the object type to determine if we should pop the scope */
409
410         object_type = walk_state->op_info->object_type;
411
412 #ifndef ACPI_NO_METHOD_EXECUTION
413         if (walk_state->op_info->flags & AML_FIELD) {
414                 /*
415                  * If we are executing a method, do not create any namespace objects
416                  * during the load phase, only during execution.
417                  */
418                 if (!walk_state->method_node) {
419                         if (walk_state->opcode == AML_FIELD_OP ||
420                             walk_state->opcode == AML_BANK_FIELD_OP ||
421                             walk_state->opcode == AML_INDEX_FIELD_OP) {
422                                 status =
423                                     acpi_ds_init_field_objects(op, walk_state);
424                         }
425                 }
426                 return_ACPI_STATUS(status);
427         }
428
429         /*
430          * If we are executing a method, do not create any namespace objects
431          * during the load phase, only during execution.
432          */
433         if (!walk_state->method_node) {
434                 if (op->common.aml_opcode == AML_REGION_OP) {
435                         status =
436                             acpi_ex_create_region(op->named.data,
437                                                   op->named.length,
438                                                   (acpi_adr_space_type) ((op->
439                                                                           common.
440                                                                           value.
441                                                                           arg)->
442                                                                          common.
443                                                                          value.
444                                                                          integer),
445                                                   walk_state);
446                         if (ACPI_FAILURE(status)) {
447                                 return_ACPI_STATUS(status);
448                         }
449                 } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
450                         status =
451                             acpi_ex_create_region(op->named.data,
452                                                   op->named.length,
453                                                   ACPI_ADR_SPACE_DATA_TABLE,
454                                                   walk_state);
455                         if (ACPI_FAILURE(status)) {
456                                 return_ACPI_STATUS(status);
457                         }
458                 }
459         }
460 #endif
461
462         if (op->common.aml_opcode == AML_NAME_OP) {
463
464                 /* For Name opcode, get the object type from the argument */
465
466                 if (op->common.value.arg) {
467                         object_type = (acpi_ps_get_opcode_info((op->common.
468                                                                 value.arg)->
469                                                                common.
470                                                                aml_opcode))->
471                             object_type;
472
473                         /* Set node type if we have a namespace node */
474
475                         if (op->common.node) {
476                                 op->common.node->type = (u8) object_type;
477                         }
478                 }
479         }
480
481         /*
482          * If we are executing a method, do not create any namespace objects
483          * during the load phase, only during execution.
484          */
485         if (!walk_state->method_node) {
486                 if (op->common.aml_opcode == AML_METHOD_OP) {
487                         /*
488                          * method_op pkg_length name_string method_flags term_list
489                          *
490                          * Note: We must create the method node/object pair as soon as we
491                          * see the method declaration. This allows later pass1 parsing
492                          * of invocations of the method (need to know the number of
493                          * arguments.)
494                          */
495                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
496                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
497                                           walk_state, op, op->named.node));
498
499                         if (!acpi_ns_get_attached_object(op->named.node)) {
500                                 walk_state->operands[0] =
501                                     ACPI_CAST_PTR(void, op->named.node);
502                                 walk_state->num_operands = 1;
503
504                                 status =
505                                     acpi_ds_create_operands(walk_state,
506                                                             op->common.value.
507                                                             arg);
508                                 if (ACPI_SUCCESS(status)) {
509                                         status =
510                                             acpi_ex_create_method(op->named.
511                                                                   data,
512                                                                   op->named.
513                                                                   length,
514                                                                   walk_state);
515                                 }
516
517                                 walk_state->operands[0] = NULL;
518                                 walk_state->num_operands = 0;
519
520                                 if (ACPI_FAILURE(status)) {
521                                         return_ACPI_STATUS(status);
522                                 }
523                         }
524                 }
525         }
526
527         /* Pop the scope stack (only if loading a table) */
528
529         if (!walk_state->method_node && acpi_ns_opens_scope(object_type)) {
530                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
531                                   "(%s): Popping scope for Op %p\n",
532                                   acpi_ut_get_type_name(object_type), op));
533
534                 status = acpi_ds_scope_stack_pop(walk_state);
535         }
536
537         return_ACPI_STATUS(status);
538 }