summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/nseval.c
blob: 80670cb32b5a3fe9438e735d26ef1b269be1e3f7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
/*******************************************************************************
 *
 * Module Name: nseval - Object evaluation, includes control method execution
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2015, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acparser.h"
#include "acinterp.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nseval")

/* Local prototypes */
static void
acpi_ns_exec_module_code(union acpi_operand_object *method_obj,
			 struct acpi_evaluate_info *info);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_evaluate
 *
 * PARAMETERS:  info            - Evaluation info block, contains these fields
 *                                and more:
 *                  prefix_node     - Prefix or Method/Object Node to execute
 *                  relative_path   - Name of method to execute, If NULL, the
 *                                    Node is the object to execute
 *                  parameters      - List of parameters to pass to the method,
 *                                    terminated by NULL. Params itself may be
 *                                    NULL if no parameters are being passed.
 *                  parameter_type  - Type of Parameter list
 *                  return_object   - Where to put method's return value (if
 *                                    any). If NULL, no value is returned.
 *                  flags           - ACPI_IGNORE_RETURN_VALUE to delete return
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute a control method or return the current value of an
 *              ACPI namespace object.
 *
 * MUTEX:       Locks interpreter
 *
 ******************************************************************************/

acpi_status acpi_ns_evaluate(struct acpi_evaluate_info *info)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(ns_evaluate);

	if (!info) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	if (!info->node) {
		/*
		 * Get the actual namespace node for the target object if we
		 * need to. Handles these cases:
		 *
		 * 1) Null node, valid pathname from root (absolute path)
		 * 2) Node and valid pathname (path relative to Node)
		 * 3) Node, Null pathname
		 */
		status =
		    acpi_ns_get_node(info->prefix_node, info->relative_pathname,
				     ACPI_NS_NO_UPSEARCH, &info->node);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	}

	/*
	 * For a method alias, we must grab the actual method node so that
	 * proper scoping context will be established before execution.
	 */
	if (acpi_ns_get_type(info->node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) {
		info->node =
		    ACPI_CAST_PTR(struct acpi_namespace_node,
				  info->node->object);
	}

	/* Complete the info block initialization */

	info->return_object = NULL;
	info->node_flags = info->node->flags;
	info->obj_desc = acpi_ns_get_attached_object(info->node);

	ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n",
			  info->relative_pathname, info->node,
			  acpi_ns_get_attached_object(info->node)));

	/* Get info if we have a predefined name (_HID, etc.) */

	info->predefined =
	    acpi_ut_match_predefined_method(info->node->name.ascii);

	/* Get the full pathname to the object, for use in warning messages */

	info->full_pathname = acpi_ns_get_external_pathname(info->node);
	if (!info->full_pathname) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Count the number of arguments being passed in */

	info->param_count = 0;
	if (info->parameters) {
		while (info->parameters[info->param_count]) {
			info->param_count++;
		}

		/* Warn on impossible argument count */

		if (info->param_count > ACPI_METHOD_NUM_ARGS) {
			ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
					      ACPI_WARN_ALWAYS,
					      "Excess arguments (%u) - using only %u",
					      info->param_count,
					      ACPI_METHOD_NUM_ARGS));

			info->param_count = ACPI_METHOD_NUM_ARGS;
		}
	}

	/*
	 * For predefined names: Check that the declared argument count
	 * matches the ACPI spec -- otherwise this is a BIOS error.
	 */
	acpi_ns_check_acpi_compliance(info->full_pathname, info->node,
				      info->predefined);

	/*
	 * For all names: Check that the incoming argument count for
	 * this method/object matches the actual ASL/AML definition.
	 */
	acpi_ns_check_argument_count(info->full_pathname, info->node,
				     info->param_count, info->predefined);

	/* For predefined names: Typecheck all incoming arguments */

	acpi_ns_check_argument_types(info);

	/*
	 * Three major evaluation cases:
	 *
	 * 1) Object types that cannot be evaluated by definition
	 * 2) The object is a control method -- execute it
	 * 3) The object is not a method -- just return it's current value
	 */
	switch (acpi_ns_get_type(info->node)) {
	case ACPI_TYPE_DEVICE:
	case ACPI_TYPE_EVENT:
	case ACPI_TYPE_MUTEX:
	case ACPI_TYPE_REGION:
	case ACPI_TYPE_THERMAL:
	case ACPI_TYPE_LOCAL_SCOPE:
		/*
		 * 1) Disallow evaluation of certain object types. For these,
		 *    object evaluation is undefined and not supported.
		 */
		ACPI_ERROR((AE_INFO,
			    "%s: Evaluation of object type [%s] is not supported",
			    info->full_pathname,
			    acpi_ut_get_type_name(info->node->type)));

		status = AE_TYPE;
		goto cleanup;

	case ACPI_TYPE_METHOD:
		/*
		 * 2) Object is a control method - execute it
		 */

		/* Verify that there is a method object associated with this node */

		if (!info->obj_desc) {
			ACPI_ERROR((AE_INFO,
				    "%s: Method has no attached sub-object",
				    info->full_pathname));
			status = AE_NULL_OBJECT;
			goto cleanup;
		}

		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "**** Execute method [%s] at AML address %p length %X\n",
				  info->full_pathname,
				  info->obj_desc->method.aml_start + 1,
				  info->obj_desc->method.aml_length - 1));

		/*
		 * Any namespace deletion must acquire both the namespace and
		 * interpreter locks to ensure that no thread is using the portion of
		 * the namespace that is being deleted.
		 *
		 * Execute the method via the interpreter. The interpreter is locked
		 * here before calling into the AML parser
		 */
		acpi_ex_enter_interpreter();
		status = acpi_ps_execute_method(info);
		acpi_ex_exit_interpreter();
		break;

	default:
		/*
		 * 3) All other non-method objects -- get the current object value
		 */

		/*
		 * Some objects require additional resolution steps (e.g., the Node
		 * may be a field that must be read, etc.) -- we can't just grab
		 * the object out of the node.
		 *
		 * Use resolve_node_to_value() to get the associated value.
		 *
		 * NOTE: we can get away with passing in NULL for a walk state because
		 * the Node is guaranteed to not be a reference to either a method
		 * local or a method argument (because this interface is never called
		 * from a running method.)
		 *
		 * Even though we do not directly invoke the interpreter for object
		 * resolution, we must lock it because we could access an op_region.
		 * The op_region access code assumes that the interpreter is locked.
		 */
		acpi_ex_enter_interpreter();

		/* TBD: resolve_node_to_value has a strange interface, fix */

		info->return_object =
		    ACPI_CAST_PTR(union acpi_operand_object, info->node);

		status =
		    acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR
						  (struct acpi_namespace_node,
						   &info->return_object), NULL);
		acpi_ex_exit_interpreter();

		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}

		ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Returned object %p [%s]\n",
				  info->return_object,
				  acpi_ut_get_object_type_name(info->
							       return_object)));

		status = AE_CTRL_RETURN_VALUE;	/* Always has a "return value" */
		break;
	}

	/*
	 * For predefined names, check the return value against the ACPI
	 * specification. Some incorrect return value types are repaired.
	 */
	(void)acpi_ns_check_return_value(info->node, info, info->param_count,
					 status, &info->return_object);

	/* Check if there is a return value that must be dealt with */

	if (status == AE_CTRL_RETURN_VALUE) {

		/* If caller does not want the return value, delete it */

		if (info->flags & ACPI_IGNORE_RETURN_VALUE) {
			acpi_ut_remove_reference(info->return_object);
			info->return_object = NULL;
		}

		/* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */

		status = AE_OK;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
			  "*** Completed evaluation of object %s ***\n",
			  info->relative_pathname));

cleanup:
	/*
	 * Namespace was unlocked by the handling acpi_ns* function, so we
	 * just free the pathname and return
	 */
	ACPI_FREE(info->full_pathname);
	info->full_pathname = NULL;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_exec_module_code_list
 *
 * PARAMETERS:  None
 *
 * RETURN:      None. Exceptions during method execution are ignored, since
 *              we cannot abort a table load.
 *
 * DESCRIPTION: Execute all elements of the global module-level code list.
 *              Each element is executed as a single control method.
 *
 ******************************************************************************/

void acpi_ns_exec_module_code_list(void)
{
	union acpi_operand_object *prev;
	union acpi_operand_object *next;
	struct acpi_evaluate_info *info;
	u32 method_count = 0;

	ACPI_FUNCTION_TRACE(ns_exec_module_code_list);

	/* Exit now if the list is empty */

	next = acpi_gbl_module_code_list;
	if (!next) {
		return_VOID;
	}

	/* Allocate the evaluation information block */

	info = ACPI_ALLOCATE(sizeof(struct acpi_evaluate_info));
	if (!info) {
		return_VOID;
	}

	/* Walk the list, executing each "method" */

	while (next) {
		prev = next;
		next = next->method.mutex;

		/* Clear the link field and execute the method */

		prev->method.mutex = NULL;
		acpi_ns_exec_module_code(prev, info);
		method_count++;

		/* Delete the (temporary) method object */

		acpi_ut_remove_reference(prev);
	}

	ACPI_INFO((AE_INFO,
		   "Executed %u blocks of module-level executable AML code",
		   method_count));

	ACPI_FREE(info);
	acpi_gbl_module_code_list = NULL;
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_exec_module_code
 *
 * PARAMETERS:  method_obj          - Object container for the module-level code
 *              info                - Info block for method evaluation
 *
 * RETURN:      None. Exceptions during method execution are ignored, since
 *              we cannot abort a table load.
 *
 * DESCRIPTION: Execute a control method containing a block of module-level
 *              executable AML code. The control method is temporarily
 *              installed to the root node, then evaluated.
 *
 ******************************************************************************/

static void
acpi_ns_exec_module_code(union acpi_operand_object *method_obj,
			 struct acpi_evaluate_info *info)
{
	union acpi_operand_object *parent_obj;
	struct acpi_namespace_node *parent_node;
	acpi_object_type type;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ns_exec_module_code);

	/*
	 * Get the parent node. We cheat by using the next_object field
	 * of the method object descriptor.
	 */
	parent_node = ACPI_CAST_PTR(struct acpi_namespace_node,
				    method_obj->method.next_object);
	type = acpi_ns_get_type(parent_node);

	/*
	 * Get the region handler and save it in the method object. We may need
	 * this if an operation region declaration causes a _REG method to be run.
	 *
	 * We can't do this in acpi_ps_link_module_code because
	 * acpi_gbl_root_node->Object is NULL at PASS1.
	 */
	if ((type == ACPI_TYPE_DEVICE) && parent_node->object) {
		method_obj->method.dispatch.handler =
		    parent_node->object->device.handler;
	}

	/* Must clear next_object (acpi_ns_attach_object needs the field) */

	method_obj->method.next_object = NULL;

	/* Initialize the evaluation information block */

	memset(info, 0, sizeof(struct acpi_evaluate_info));
	info->prefix_node = parent_node;

	/*
	 * Get the currently attached parent object. Add a reference, because the
	 * ref count will be decreased when the method object is installed to
	 * the parent node.
	 */
	parent_obj = acpi_ns_get_attached_object(parent_node);
	if (parent_obj) {
		acpi_ut_add_reference(parent_obj);
	}

	/* Install the method (module-level code) in the parent node */

	status = acpi_ns_attach_object(parent_node, method_obj,
				       ACPI_TYPE_METHOD);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	/* Execute the parent node as a control method */

	status = acpi_ns_evaluate(info);

	ACPI_DEBUG_PRINT((ACPI_DB_INIT, "Executed module-level code at %p\n",
			  method_obj->method.aml_start));

	/* Delete a possible implicit return value (in slack mode) */

	if (info->return_object) {
		acpi_ut_remove_reference(info->return_object);
	}

	/* Detach the temporary method object */

	acpi_ns_detach_object(parent_node);

	/* Restore the original parent object */

	if (parent_obj) {
		status = acpi_ns_attach_object(parent_node, parent_obj, type);
	} else {
		parent_node->type = (u8)type;
	}

exit:
	if (parent_obj) {
		acpi_ut_remove_reference(parent_obj);
	}
	return_VOID;
}