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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: dsutils - Dispatcher utilities | |
4 | * | |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
4a90c7e8 | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
1da177e4 LT |
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 | ||
1da177e4 LT |
44 | #include <acpi/acpi.h> |
45 | #include <acpi/acparser.h> | |
46 | #include <acpi/amlcode.h> | |
47 | #include <acpi/acdispat.h> | |
48 | #include <acpi/acinterp.h> | |
49 | #include <acpi/acnamesp.h> | |
50 | #include <acpi/acdebug.h> | |
51 | ||
52 | #define _COMPONENT ACPI_DISPATCHER | |
4be44fcd | 53 | ACPI_MODULE_NAME("dsutils") |
1da177e4 LT |
54 | |
55 | /******************************************************************************* | |
56 | * | |
57 | * FUNCTION: acpi_ds_clear_implicit_return | |
58 | * | |
59 | * PARAMETERS: walk_state - Current State | |
60 | * | |
61 | * RETURN: None. | |
62 | * | |
63 | * DESCRIPTION: Clear and remove a reference on an implicit return value. Used | |
64 | * to delete "stale" return values (if enabled, the return value | |
65 | * from every operator is saved at least momentarily, in case the | |
66 | * parent method exits.) | |
67 | * | |
68 | ******************************************************************************/ | |
4be44fcd | 69 | void acpi_ds_clear_implicit_return(struct acpi_walk_state *walk_state) |
1da177e4 | 70 | { |
b229cf92 | 71 | ACPI_FUNCTION_NAME(ds_clear_implicit_return); |
1da177e4 LT |
72 | |
73 | /* | |
74 | * Slack must be enabled for this feature | |
75 | */ | |
76 | if (!acpi_gbl_enable_interpreter_slack) { | |
77 | return; | |
78 | } | |
79 | ||
80 | if (walk_state->implicit_return_obj) { | |
81 | /* | |
82 | * Delete any "stale" implicit return. However, in | |
83 | * complex statements, the implicit return value can be | |
84 | * bubbled up several levels. | |
85 | */ | |
4be44fcd LB |
86 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
87 | "Removing reference on stale implicit return obj %p\n", | |
88 | walk_state->implicit_return_obj)); | |
1da177e4 | 89 | |
4be44fcd | 90 | acpi_ut_remove_reference(walk_state->implicit_return_obj); |
1da177e4 LT |
91 | walk_state->implicit_return_obj = NULL; |
92 | } | |
93 | } | |
94 | ||
1da177e4 | 95 | #ifndef ACPI_NO_METHOD_EXECUTION |
1da177e4 LT |
96 | /******************************************************************************* |
97 | * | |
98 | * FUNCTION: acpi_ds_do_implicit_return | |
99 | * | |
100 | * PARAMETERS: return_desc - The return value | |
101 | * walk_state - Current State | |
102 | * add_reference - True if a reference should be added to the | |
103 | * return object | |
104 | * | |
105 | * RETURN: TRUE if implicit return enabled, FALSE otherwise | |
106 | * | |
107 | * DESCRIPTION: Implements the optional "implicit return". We save the result | |
108 | * of every ASL operator and control method invocation in case the | |
109 | * parent method exit. Before storing a new return value, we | |
110 | * delete the previous return value. | |
111 | * | |
112 | ******************************************************************************/ | |
113 | ||
114 | u8 | |
4be44fcd LB |
115 | acpi_ds_do_implicit_return(union acpi_operand_object *return_desc, |
116 | struct acpi_walk_state *walk_state, u8 add_reference) | |
1da177e4 | 117 | { |
b229cf92 | 118 | ACPI_FUNCTION_NAME(ds_do_implicit_return); |
1da177e4 LT |
119 | |
120 | /* | |
121 | * Slack must be enabled for this feature, and we must | |
122 | * have a valid return object | |
123 | */ | |
4be44fcd | 124 | if ((!acpi_gbl_enable_interpreter_slack) || (!return_desc)) { |
1da177e4 LT |
125 | return (FALSE); |
126 | } | |
127 | ||
4be44fcd LB |
128 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
129 | "Result %p will be implicitly returned; Prev=%p\n", | |
130 | return_desc, walk_state->implicit_return_obj)); | |
1da177e4 LT |
131 | |
132 | /* | |
133 | * Delete any "stale" implicit return value first. However, in | |
134 | * complex statements, the implicit return value can be | |
135 | * bubbled up several levels, so we don't clear the value if it | |
136 | * is the same as the return_desc. | |
137 | */ | |
138 | if (walk_state->implicit_return_obj) { | |
139 | if (walk_state->implicit_return_obj == return_desc) { | |
140 | return (TRUE); | |
141 | } | |
4be44fcd | 142 | acpi_ds_clear_implicit_return(walk_state); |
1da177e4 LT |
143 | } |
144 | ||
145 | /* Save the implicit return value, add a reference if requested */ | |
146 | ||
147 | walk_state->implicit_return_obj = return_desc; | |
148 | if (add_reference) { | |
4be44fcd | 149 | acpi_ut_add_reference(return_desc); |
1da177e4 LT |
150 | } |
151 | ||
152 | return (TRUE); | |
153 | } | |
154 | ||
1da177e4 LT |
155 | /******************************************************************************* |
156 | * | |
157 | * FUNCTION: acpi_ds_is_result_used | |
158 | * | |
159 | * PARAMETERS: Op - Current Op | |
160 | * walk_state - Current State | |
161 | * | |
162 | * RETURN: TRUE if result is used, FALSE otherwise | |
163 | * | |
164 | * DESCRIPTION: Check if a result object will be used by the parent | |
165 | * | |
166 | ******************************************************************************/ | |
167 | ||
168 | u8 | |
4be44fcd LB |
169 | acpi_ds_is_result_used(union acpi_parse_object * op, |
170 | struct acpi_walk_state * walk_state) | |
1da177e4 | 171 | { |
4be44fcd | 172 | const struct acpi_opcode_info *parent_info; |
1da177e4 | 173 | |
b229cf92 | 174 | ACPI_FUNCTION_TRACE_PTR(ds_is_result_used, op); |
1da177e4 LT |
175 | |
176 | /* Must have both an Op and a Result Object */ | |
177 | ||
178 | if (!op) { | |
b8e4d893 | 179 | ACPI_ERROR((AE_INFO, "Null Op")); |
50eca3eb | 180 | return_UINT8(TRUE); |
1da177e4 LT |
181 | } |
182 | ||
183 | /* | |
184 | * We know that this operator is not a | |
185 | * Return() operator (would not come here.) The following code is the | |
186 | * optional support for a so-called "implicit return". Some AML code | |
187 | * assumes that the last value of the method is "implicitly" returned | |
188 | * to the caller. Just save the last result as the return value. | |
189 | * NOTE: this is optional because the ASL language does not actually | |
190 | * support this behavior. | |
191 | */ | |
4be44fcd LB |
192 | (void)acpi_ds_do_implicit_return(walk_state->result_obj, walk_state, |
193 | TRUE); | |
1da177e4 LT |
194 | |
195 | /* | |
196 | * Now determine if the parent will use the result | |
197 | * | |
198 | * If there is no parent, or the parent is a scope_op, we are executing | |
199 | * at the method level. An executing method typically has no parent, | |
200 | * since each method is parsed separately. A method invoked externally | |
201 | * via execute_control_method has a scope_op as the parent. | |
202 | */ | |
203 | if ((!op->common.parent) || | |
4be44fcd | 204 | (op->common.parent->common.aml_opcode == AML_SCOPE_OP)) { |
52fc0b02 | 205 | |
1da177e4 LT |
206 | /* No parent, the return value cannot possibly be used */ |
207 | ||
4be44fcd LB |
208 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
209 | "At Method level, result of [%s] not used\n", | |
210 | acpi_ps_get_opcode_name(op->common. | |
211 | aml_opcode))); | |
50eca3eb | 212 | return_UINT8(FALSE); |
1da177e4 LT |
213 | } |
214 | ||
215 | /* Get info on the parent. The root_op is AML_SCOPE */ | |
216 | ||
4be44fcd LB |
217 | parent_info = |
218 | acpi_ps_get_opcode_info(op->common.parent->common.aml_opcode); | |
1da177e4 | 219 | if (parent_info->class == AML_CLASS_UNKNOWN) { |
b8e4d893 | 220 | ACPI_ERROR((AE_INFO, "Unknown parent opcode Op=%p", op)); |
50eca3eb | 221 | return_UINT8(FALSE); |
1da177e4 LT |
222 | } |
223 | ||
224 | /* | |
225 | * Decide what to do with the result based on the parent. If | |
226 | * the parent opcode will not use the result, delete the object. | |
227 | * Otherwise leave it as is, it will be deleted when it is used | |
228 | * as an operand later. | |
229 | */ | |
230 | switch (parent_info->class) { | |
231 | case AML_CLASS_CONTROL: | |
232 | ||
233 | switch (op->common.parent->common.aml_opcode) { | |
234 | case AML_RETURN_OP: | |
235 | ||
236 | /* Never delete the return value associated with a return opcode */ | |
237 | ||
238 | goto result_used; | |
239 | ||
240 | case AML_IF_OP: | |
241 | case AML_WHILE_OP: | |
242 | ||
243 | /* | |
244 | * If we are executing the predicate AND this is the predicate op, | |
245 | * we will use the return value | |
246 | */ | |
4be44fcd LB |
247 | if ((walk_state->control_state->common.state == |
248 | ACPI_CONTROL_PREDICATE_EXECUTING) | |
249 | && (walk_state->control_state->control. | |
250 | predicate_op == op)) { | |
1da177e4 LT |
251 | goto result_used; |
252 | } | |
253 | break; | |
254 | ||
255 | default: | |
256 | /* Ignore other control opcodes */ | |
257 | break; | |
258 | } | |
259 | ||
260 | /* The general control opcode returns no result */ | |
261 | ||
262 | goto result_not_used; | |
263 | ||
1da177e4 LT |
264 | case AML_CLASS_CREATE: |
265 | ||
266 | /* | |
267 | * These opcodes allow term_arg(s) as operands and therefore | |
268 | * the operands can be method calls. The result is used. | |
269 | */ | |
270 | goto result_used; | |
271 | ||
1da177e4 LT |
272 | case AML_CLASS_NAMED_OBJECT: |
273 | ||
4be44fcd LB |
274 | if ((op->common.parent->common.aml_opcode == AML_REGION_OP) || |
275 | (op->common.parent->common.aml_opcode == AML_DATA_REGION_OP) | |
276 | || (op->common.parent->common.aml_opcode == AML_PACKAGE_OP) | |
277 | || (op->common.parent->common.aml_opcode == | |
278 | AML_VAR_PACKAGE_OP) | |
279 | || (op->common.parent->common.aml_opcode == AML_BUFFER_OP) | |
280 | || (op->common.parent->common.aml_opcode == | |
281 | AML_INT_EVAL_SUBTREE_OP)) { | |
1da177e4 LT |
282 | /* |
283 | * These opcodes allow term_arg(s) as operands and therefore | |
284 | * the operands can be method calls. The result is used. | |
285 | */ | |
286 | goto result_used; | |
287 | } | |
288 | ||
289 | goto result_not_used; | |
290 | ||
1da177e4 LT |
291 | default: |
292 | ||
293 | /* | |
294 | * In all other cases. the parent will actually use the return | |
295 | * object, so keep it. | |
296 | */ | |
297 | goto result_used; | |
298 | } | |
299 | ||
4be44fcd LB |
300 | result_used: |
301 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, | |
302 | "Result of [%s] used by Parent [%s] Op=%p\n", | |
303 | acpi_ps_get_opcode_name(op->common.aml_opcode), | |
304 | acpi_ps_get_opcode_name(op->common.parent->common. | |
305 | aml_opcode), op)); | |
1da177e4 | 306 | |
50eca3eb | 307 | return_UINT8(TRUE); |
1da177e4 | 308 | |
4be44fcd LB |
309 | result_not_used: |
310 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, | |
311 | "Result of [%s] not used by Parent [%s] Op=%p\n", | |
312 | acpi_ps_get_opcode_name(op->common.aml_opcode), | |
313 | acpi_ps_get_opcode_name(op->common.parent->common. | |
314 | aml_opcode), op)); | |
1da177e4 | 315 | |
50eca3eb | 316 | return_UINT8(FALSE); |
1da177e4 LT |
317 | } |
318 | ||
1da177e4 LT |
319 | /******************************************************************************* |
320 | * | |
321 | * FUNCTION: acpi_ds_delete_result_if_not_used | |
322 | * | |
323 | * PARAMETERS: Op - Current parse Op | |
324 | * result_obj - Result of the operation | |
325 | * walk_state - Current state | |
326 | * | |
327 | * RETURN: Status | |
328 | * | |
329 | * DESCRIPTION: Used after interpretation of an opcode. If there is an internal | |
330 | * result descriptor, check if the parent opcode will actually use | |
331 | * this result. If not, delete the result now so that it will | |
332 | * not become orphaned. | |
333 | * | |
334 | ******************************************************************************/ | |
335 | ||
336 | void | |
4be44fcd LB |
337 | acpi_ds_delete_result_if_not_used(union acpi_parse_object *op, |
338 | union acpi_operand_object *result_obj, | |
339 | struct acpi_walk_state *walk_state) | |
1da177e4 | 340 | { |
4be44fcd LB |
341 | union acpi_operand_object *obj_desc; |
342 | acpi_status status; | |
1da177e4 | 343 | |
b229cf92 | 344 | ACPI_FUNCTION_TRACE_PTR(ds_delete_result_if_not_used, result_obj); |
1da177e4 LT |
345 | |
346 | if (!op) { | |
b8e4d893 | 347 | ACPI_ERROR((AE_INFO, "Null Op")); |
1da177e4 LT |
348 | return_VOID; |
349 | } | |
350 | ||
351 | if (!result_obj) { | |
352 | return_VOID; | |
353 | } | |
354 | ||
4be44fcd | 355 | if (!acpi_ds_is_result_used(op, walk_state)) { |
52fc0b02 | 356 | |
1da177e4 LT |
357 | /* Must pop the result stack (obj_desc should be equal to result_obj) */ |
358 | ||
4be44fcd LB |
359 | status = acpi_ds_result_pop(&obj_desc, walk_state); |
360 | if (ACPI_SUCCESS(status)) { | |
361 | acpi_ut_remove_reference(result_obj); | |
1da177e4 LT |
362 | } |
363 | } | |
364 | ||
365 | return_VOID; | |
366 | } | |
367 | ||
1da177e4 LT |
368 | /******************************************************************************* |
369 | * | |
370 | * FUNCTION: acpi_ds_resolve_operands | |
371 | * | |
372 | * PARAMETERS: walk_state - Current walk state with operands on stack | |
373 | * | |
374 | * RETURN: Status | |
375 | * | |
376 | * DESCRIPTION: Resolve all operands to their values. Used to prepare | |
377 | * arguments to a control method invocation (a call from one | |
378 | * method to another.) | |
379 | * | |
380 | ******************************************************************************/ | |
381 | ||
4be44fcd | 382 | acpi_status acpi_ds_resolve_operands(struct acpi_walk_state *walk_state) |
1da177e4 | 383 | { |
4be44fcd LB |
384 | u32 i; |
385 | acpi_status status = AE_OK; | |
1da177e4 | 386 | |
b229cf92 | 387 | ACPI_FUNCTION_TRACE_PTR(ds_resolve_operands, walk_state); |
1da177e4 LT |
388 | |
389 | /* | |
390 | * Attempt to resolve each of the valid operands | |
391 | * Method arguments are passed by reference, not by value. This means | |
392 | * that the actual objects are passed, not copies of the objects. | |
393 | */ | |
394 | for (i = 0; i < walk_state->num_operands; i++) { | |
4be44fcd LB |
395 | status = |
396 | acpi_ex_resolve_to_value(&walk_state->operands[i], | |
397 | walk_state); | |
398 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
399 | break; |
400 | } | |
401 | } | |
402 | ||
4be44fcd | 403 | return_ACPI_STATUS(status); |
1da177e4 LT |
404 | } |
405 | ||
1da177e4 LT |
406 | /******************************************************************************* |
407 | * | |
408 | * FUNCTION: acpi_ds_clear_operands | |
409 | * | |
410 | * PARAMETERS: walk_state - Current walk state with operands on stack | |
411 | * | |
412 | * RETURN: None | |
413 | * | |
414 | * DESCRIPTION: Clear all operands on the current walk state operand stack. | |
415 | * | |
416 | ******************************************************************************/ | |
417 | ||
4be44fcd | 418 | void acpi_ds_clear_operands(struct acpi_walk_state *walk_state) |
1da177e4 | 419 | { |
4be44fcd | 420 | u32 i; |
1da177e4 | 421 | |
b229cf92 | 422 | ACPI_FUNCTION_TRACE_PTR(ds_clear_operands, walk_state); |
1da177e4 LT |
423 | |
424 | /* Remove a reference on each operand on the stack */ | |
425 | ||
426 | for (i = 0; i < walk_state->num_operands; i++) { | |
427 | /* | |
428 | * Remove a reference to all operands, including both | |
429 | * "Arguments" and "Targets". | |
430 | */ | |
4be44fcd | 431 | acpi_ut_remove_reference(walk_state->operands[i]); |
1da177e4 LT |
432 | walk_state->operands[i] = NULL; |
433 | } | |
434 | ||
435 | walk_state->num_operands = 0; | |
436 | return_VOID; | |
437 | } | |
438 | #endif | |
439 | ||
1da177e4 LT |
440 | /******************************************************************************* |
441 | * | |
442 | * FUNCTION: acpi_ds_create_operand | |
443 | * | |
444 | * PARAMETERS: walk_state - Current walk state | |
445 | * Arg - Parse object for the argument | |
446 | * arg_index - Which argument (zero based) | |
447 | * | |
448 | * RETURN: Status | |
449 | * | |
450 | * DESCRIPTION: Translate a parse tree object that is an argument to an AML | |
451 | * opcode to the equivalent interpreter object. This may include | |
452 | * looking up a name or entering a new name into the internal | |
453 | * namespace. | |
454 | * | |
455 | ******************************************************************************/ | |
456 | ||
457 | acpi_status | |
4be44fcd LB |
458 | acpi_ds_create_operand(struct acpi_walk_state *walk_state, |
459 | union acpi_parse_object *arg, u32 arg_index) | |
1da177e4 | 460 | { |
4be44fcd LB |
461 | acpi_status status = AE_OK; |
462 | char *name_string; | |
463 | u32 name_length; | |
464 | union acpi_operand_object *obj_desc; | |
465 | union acpi_parse_object *parent_op; | |
466 | u16 opcode; | |
467 | acpi_interpreter_mode interpreter_mode; | |
468 | const struct acpi_opcode_info *op_info; | |
1da177e4 | 469 | |
b229cf92 | 470 | ACPI_FUNCTION_TRACE_PTR(ds_create_operand, arg); |
1da177e4 LT |
471 | |
472 | /* A valid name must be looked up in the namespace */ | |
473 | ||
474 | if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) && | |
4be44fcd LB |
475 | (arg->common.value.string)) { |
476 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n", | |
477 | arg)); | |
1da177e4 LT |
478 | |
479 | /* Get the entire name string from the AML stream */ | |
480 | ||
4be44fcd LB |
481 | status = |
482 | acpi_ex_get_name_string(ACPI_TYPE_ANY, | |
483 | arg->common.value.buffer, | |
484 | &name_string, &name_length); | |
1da177e4 | 485 | |
4be44fcd LB |
486 | if (ACPI_FAILURE(status)) { |
487 | return_ACPI_STATUS(status); | |
1da177e4 LT |
488 | } |
489 | ||
490 | /* All prefixes have been handled, and the name is in name_string */ | |
491 | ||
492 | /* | |
493 | * Special handling for buffer_field declarations. This is a deferred | |
494 | * opcode that unfortunately defines the field name as the last | |
495 | * parameter instead of the first. We get here when we are performing | |
496 | * the deferred execution, so the actual name of the field is already | |
497 | * in the namespace. We don't want to attempt to look it up again | |
498 | * because we may be executing in a different scope than where the | |
499 | * actual opcode exists. | |
500 | */ | |
501 | if ((walk_state->deferred_node) && | |
4be44fcd | 502 | (walk_state->deferred_node->type == ACPI_TYPE_BUFFER_FIELD) |
52fc0b02 BM |
503 | && (arg_index == |
504 | (u32) ((walk_state->opcode == | |
505 | AML_CREATE_FIELD_OP) ? 3 : 2))) { | |
4be44fcd LB |
506 | obj_desc = |
507 | ACPI_CAST_PTR(union acpi_operand_object, | |
508 | walk_state->deferred_node); | |
1da177e4 | 509 | status = AE_OK; |
4be44fcd LB |
510 | } else { /* All other opcodes */ |
511 | ||
1da177e4 LT |
512 | /* |
513 | * Differentiate between a namespace "create" operation | |
514 | * versus a "lookup" operation (IMODE_LOAD_PASS2 vs. | |
515 | * IMODE_EXECUTE) in order to support the creation of | |
516 | * namespace objects during the execution of control methods. | |
517 | */ | |
518 | parent_op = arg->common.parent; | |
4be44fcd LB |
519 | op_info = |
520 | acpi_ps_get_opcode_info(parent_op->common. | |
521 | aml_opcode); | |
522 | if ((op_info->flags & AML_NSNODE) | |
523 | && (parent_op->common.aml_opcode != | |
524 | AML_INT_METHODCALL_OP) | |
525 | && (parent_op->common.aml_opcode != AML_REGION_OP) | |
526 | && (parent_op->common.aml_opcode != | |
527 | AML_INT_NAMEPATH_OP)) { | |
52fc0b02 | 528 | |
1da177e4 LT |
529 | /* Enter name into namespace if not found */ |
530 | ||
531 | interpreter_mode = ACPI_IMODE_LOAD_PASS2; | |
4be44fcd | 532 | } else { |
1da177e4 LT |
533 | /* Return a failure if name not found */ |
534 | ||
535 | interpreter_mode = ACPI_IMODE_EXECUTE; | |
536 | } | |
537 | ||
4be44fcd LB |
538 | status = |
539 | acpi_ns_lookup(walk_state->scope_info, name_string, | |
540 | ACPI_TYPE_ANY, interpreter_mode, | |
541 | ACPI_NS_SEARCH_PARENT | | |
542 | ACPI_NS_DONT_OPEN_SCOPE, walk_state, | |
543 | ACPI_CAST_INDIRECT_PTR(struct | |
544 | acpi_namespace_node, | |
545 | &obj_desc)); | |
1da177e4 LT |
546 | /* |
547 | * The only case where we pass through (ignore) a NOT_FOUND | |
548 | * error is for the cond_ref_of opcode. | |
549 | */ | |
550 | if (status == AE_NOT_FOUND) { | |
4be44fcd LB |
551 | if (parent_op->common.aml_opcode == |
552 | AML_COND_REF_OF_OP) { | |
1da177e4 LT |
553 | /* |
554 | * For the Conditional Reference op, it's OK if | |
555 | * the name is not found; We just need a way to | |
556 | * indicate this to the interpreter, set the | |
557 | * object to the root | |
558 | */ | |
4be44fcd LB |
559 | obj_desc = |
560 | ACPI_CAST_PTR(union | |
561 | acpi_operand_object, | |
562 | acpi_gbl_root_node); | |
1da177e4 | 563 | status = AE_OK; |
4be44fcd | 564 | } else { |
1da177e4 LT |
565 | /* |
566 | * We just plain didn't find it -- which is a | |
567 | * very serious error at this point | |
568 | */ | |
569 | status = AE_AML_NAME_NOT_FOUND; | |
570 | } | |
571 | } | |
572 | ||
4be44fcd | 573 | if (ACPI_FAILURE(status)) { |
b8e4d893 | 574 | ACPI_ERROR_NAMESPACE(name_string, status); |
1da177e4 LT |
575 | } |
576 | } | |
577 | ||
578 | /* Free the namestring created above */ | |
579 | ||
8313524a | 580 | ACPI_FREE(name_string); |
1da177e4 LT |
581 | |
582 | /* Check status from the lookup */ | |
583 | ||
4be44fcd LB |
584 | if (ACPI_FAILURE(status)) { |
585 | return_ACPI_STATUS(status); | |
1da177e4 LT |
586 | } |
587 | ||
588 | /* Put the resulting object onto the current object stack */ | |
589 | ||
4be44fcd LB |
590 | status = acpi_ds_obj_stack_push(obj_desc, walk_state); |
591 | if (ACPI_FAILURE(status)) { | |
592 | return_ACPI_STATUS(status); | |
1da177e4 | 593 | } |
4be44fcd LB |
594 | ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object |
595 | (obj_desc, walk_state)); | |
596 | } else { | |
1da177e4 LT |
597 | /* Check for null name case */ |
598 | ||
599 | if (arg->common.aml_opcode == AML_INT_NAMEPATH_OP) { | |
600 | /* | |
601 | * If the name is null, this means that this is an | |
602 | * optional result parameter that was not specified | |
603 | * in the original ASL. Create a Zero Constant for a | |
604 | * placeholder. (Store to a constant is a Noop.) | |
605 | */ | |
4be44fcd | 606 | opcode = AML_ZERO_OP; /* Has no arguments! */ |
1da177e4 | 607 | |
4be44fcd LB |
608 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
609 | "Null namepath: Arg=%p\n", arg)); | |
610 | } else { | |
1da177e4 LT |
611 | opcode = arg->common.aml_opcode; |
612 | } | |
613 | ||
614 | /* Get the object type of the argument */ | |
615 | ||
4be44fcd | 616 | op_info = acpi_ps_get_opcode_info(opcode); |
1da177e4 | 617 | if (op_info->object_type == ACPI_TYPE_INVALID) { |
4be44fcd | 618 | return_ACPI_STATUS(AE_NOT_IMPLEMENTED); |
1da177e4 LT |
619 | } |
620 | ||
621 | if (op_info->flags & AML_HAS_RETVAL) { | |
4be44fcd | 622 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
50eca3eb | 623 | "Argument previously created, already stacked\n")); |
1da177e4 | 624 | |
4be44fcd LB |
625 | ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object |
626 | (walk_state-> | |
627 | operands[walk_state->num_operands - | |
628 | 1], walk_state)); | |
1da177e4 LT |
629 | |
630 | /* | |
631 | * Use value that was already previously returned | |
632 | * by the evaluation of this argument | |
633 | */ | |
4be44fcd LB |
634 | status = |
635 | acpi_ds_result_pop_from_bottom(&obj_desc, | |
636 | walk_state); | |
637 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
638 | /* |
639 | * Only error is underflow, and this indicates | |
640 | * a missing or null operand! | |
641 | */ | |
b8e4d893 BM |
642 | ACPI_EXCEPTION((AE_INFO, status, |
643 | "Missing or null operand")); | |
4be44fcd | 644 | return_ACPI_STATUS(status); |
1da177e4 | 645 | } |
4be44fcd | 646 | } else { |
1da177e4 LT |
647 | /* Create an ACPI_INTERNAL_OBJECT for the argument */ |
648 | ||
4be44fcd LB |
649 | obj_desc = |
650 | acpi_ut_create_internal_object(op_info-> | |
651 | object_type); | |
1da177e4 | 652 | if (!obj_desc) { |
4be44fcd | 653 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
654 | } |
655 | ||
656 | /* Initialize the new object */ | |
657 | ||
4be44fcd LB |
658 | status = |
659 | acpi_ds_init_object_from_op(walk_state, arg, opcode, | |
660 | &obj_desc); | |
661 | if (ACPI_FAILURE(status)) { | |
662 | acpi_ut_delete_object_desc(obj_desc); | |
663 | return_ACPI_STATUS(status); | |
1da177e4 LT |
664 | } |
665 | } | |
666 | ||
667 | /* Put the operand object on the object stack */ | |
668 | ||
4be44fcd LB |
669 | status = acpi_ds_obj_stack_push(obj_desc, walk_state); |
670 | if (ACPI_FAILURE(status)) { | |
671 | return_ACPI_STATUS(status); | |
1da177e4 LT |
672 | } |
673 | ||
4be44fcd LB |
674 | ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object |
675 | (obj_desc, walk_state)); | |
1da177e4 LT |
676 | } |
677 | ||
4be44fcd | 678 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
679 | } |
680 | ||
1da177e4 LT |
681 | /******************************************************************************* |
682 | * | |
683 | * FUNCTION: acpi_ds_create_operands | |
684 | * | |
685 | * PARAMETERS: walk_state - Current state | |
686 | * first_arg - First argument of a parser argument tree | |
687 | * | |
688 | * RETURN: Status | |
689 | * | |
690 | * DESCRIPTION: Convert an operator's arguments from a parse tree format to | |
691 | * namespace objects and place those argument object on the object | |
692 | * stack in preparation for evaluation by the interpreter. | |
693 | * | |
694 | ******************************************************************************/ | |
695 | ||
696 | acpi_status | |
4be44fcd LB |
697 | acpi_ds_create_operands(struct acpi_walk_state *walk_state, |
698 | union acpi_parse_object *first_arg) | |
1da177e4 | 699 | { |
4be44fcd LB |
700 | acpi_status status = AE_OK; |
701 | union acpi_parse_object *arg; | |
702 | u32 arg_count = 0; | |
1da177e4 | 703 | |
b229cf92 | 704 | ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg); |
1da177e4 LT |
705 | |
706 | /* For all arguments in the list... */ | |
707 | ||
708 | arg = first_arg; | |
709 | while (arg) { | |
4be44fcd LB |
710 | status = acpi_ds_create_operand(walk_state, arg, arg_count); |
711 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
712 | goto cleanup; |
713 | } | |
714 | ||
4be44fcd LB |
715 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
716 | "Arg #%d (%p) done, Arg1=%p\n", arg_count, | |
717 | arg, first_arg)); | |
1da177e4 LT |
718 | |
719 | /* Move on to next argument, if any */ | |
720 | ||
721 | arg = arg->common.next; | |
722 | arg_count++; | |
723 | } | |
724 | ||
4be44fcd | 725 | return_ACPI_STATUS(status); |
1da177e4 | 726 | |
4be44fcd | 727 | cleanup: |
1da177e4 LT |
728 | /* |
729 | * We must undo everything done above; meaning that we must | |
730 | * pop everything off of the operand stack and delete those | |
731 | * objects | |
732 | */ | |
4be44fcd | 733 | (void)acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state); |
1da177e4 | 734 | |
b8e4d893 BM |
735 | ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %d", |
736 | (arg_count + 1))); | |
4be44fcd | 737 | return_ACPI_STATUS(status); |
1da177e4 | 738 | } |