aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/nseval.c
diff options
context:
space:
mode:
authorLen Brown <len.brown@intel.com>2009-01-09 00:13:17 -0500
committerLen Brown <len.brown@intel.com>2009-01-09 03:30:47 -0500
commit95b482a8d31116f3f5c2a5089569393234d06385 (patch)
treef32aec8673a285a9d188948be97af3034ee06e93 /drivers/acpi/acpica/nseval.c
parent6620e0c49f577454b772fb381543d60ae53eb885 (diff)
ACPICA: create acpica/ directory
also, delete sleep/ and delete ACPI_CFLAGS from Makefile Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/nseval.c')
-rw-r--r--drivers/acpi/acpica/nseval.c278
1 files changed, 278 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nseval.c b/drivers/acpi/acpica/nseval.c
new file mode 100644
index 000000000000..a8d7764c73b7
--- /dev/null
+++ b/drivers/acpi/acpica/nseval.c
@@ -0,0 +1,278 @@
1/*******************************************************************************
2 *
3 * Module Name: nseval - Object evaluation, includes control method execution
4 *
5 ******************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2008, 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 <acpi/accommon.h>
46#include <acpi/acparser.h>
47#include <acpi/acinterp.h>
48#include <acpi/acnamesp.h>
49
50#define _COMPONENT ACPI_NAMESPACE
51ACPI_MODULE_NAME("nseval")
52
53/*******************************************************************************
54 *
55 * FUNCTION: acpi_ns_evaluate
56 *
57 * PARAMETERS: Info - Evaluation info block, contains:
58 * prefix_node - Prefix or Method/Object Node to execute
59 * Pathname - Name of method to execute, If NULL, the
60 * Node is the object to execute
61 * Parameters - List of parameters to pass to the method,
62 * terminated by NULL. Params itself may be
63 * NULL if no parameters are being passed.
64 * return_object - Where to put method's return value (if
65 * any). If NULL, no value is returned.
66 * parameter_type - Type of Parameter list
67 * return_object - Where to put method's return value (if
68 * any). If NULL, no value is returned.
69 * Flags - ACPI_IGNORE_RETURN_VALUE to delete return
70 *
71 * RETURN: Status
72 *
73 * DESCRIPTION: Execute a control method or return the current value of an
74 * ACPI namespace object.
75 *
76 * MUTEX: Locks interpreter
77 *
78 ******************************************************************************/
79acpi_status acpi_ns_evaluate(struct acpi_evaluate_info * info)
80{
81 acpi_status status;
82 struct acpi_namespace_node *node;
83
84 ACPI_FUNCTION_TRACE(ns_evaluate);
85
86 if (!info) {
87 return_ACPI_STATUS(AE_BAD_PARAMETER);
88 }
89
90 /* Initialize the return value to an invalid object */
91
92 info->return_object = NULL;
93 info->param_count = 0;
94
95 /*
96 * Get the actual namespace node for the target object. Handles these cases:
97 *
98 * 1) Null node, Pathname (absolute path)
99 * 2) Node, Pathname (path relative to Node)
100 * 3) Node, Null Pathname
101 */
102 status = acpi_ns_get_node(info->prefix_node, info->pathname,
103 ACPI_NS_NO_UPSEARCH, &info->resolved_node);
104 if (ACPI_FAILURE(status)) {
105 return_ACPI_STATUS(status);
106 }
107
108 /*
109 * For a method alias, we must grab the actual method node so that proper
110 * scoping context will be established before execution.
111 */
112 if (acpi_ns_get_type(info->resolved_node) ==
113 ACPI_TYPE_LOCAL_METHOD_ALIAS) {
114 info->resolved_node =
115 ACPI_CAST_PTR(struct acpi_namespace_node,
116 info->resolved_node->object);
117 }
118
119 ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n", info->pathname,
120 info->resolved_node,
121 acpi_ns_get_attached_object(info->resolved_node)));
122
123 node = info->resolved_node;
124
125 /*
126 * Two major cases here:
127 *
128 * 1) The object is a control method -- execute it
129 * 2) The object is not a method -- just return it's current value
130 */
131 if (acpi_ns_get_type(info->resolved_node) == ACPI_TYPE_METHOD) {
132 /*
133 * 1) Object is a control method - execute it
134 */
135
136 /* Verify that there is a method object associated with this node */
137
138 info->obj_desc =
139 acpi_ns_get_attached_object(info->resolved_node);
140 if (!info->obj_desc) {
141 ACPI_ERROR((AE_INFO,
142 "Control method has no attached sub-object"));
143 return_ACPI_STATUS(AE_NULL_OBJECT);
144 }
145
146 /* Count the number of arguments being passed to the method */
147
148 if (info->parameters) {
149 while (info->parameters[info->param_count]) {
150 if (info->param_count > ACPI_METHOD_MAX_ARG) {
151 return_ACPI_STATUS(AE_LIMIT);
152 }
153 info->param_count++;
154 }
155 }
156
157
158 ACPI_DUMP_PATHNAME(info->resolved_node, "Execute Method:",
159 ACPI_LV_INFO, _COMPONENT);
160
161 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
162 "Method at AML address %p Length %X\n",
163 info->obj_desc->method.aml_start + 1,
164 info->obj_desc->method.aml_length - 1));
165
166 /*
167 * Any namespace deletion must acquire both the namespace and
168 * interpreter locks to ensure that no thread is using the portion of
169 * the namespace that is being deleted.
170 *
171 * Execute the method via the interpreter. The interpreter is locked
172 * here before calling into the AML parser
173 */
174 acpi_ex_enter_interpreter();
175 status = acpi_ps_execute_method(info);
176 acpi_ex_exit_interpreter();
177 } else {
178 /*
179 * 2) Object is not a method, return its current value
180 *
181 * Disallow certain object types. For these, "evaluation" is undefined.
182 */
183 switch (info->resolved_node->type) {
184 case ACPI_TYPE_DEVICE:
185 case ACPI_TYPE_EVENT:
186 case ACPI_TYPE_MUTEX:
187 case ACPI_TYPE_REGION:
188 case ACPI_TYPE_THERMAL:
189 case ACPI_TYPE_LOCAL_SCOPE:
190
191 ACPI_ERROR((AE_INFO,
192 "[%4.4s] Evaluation of object type [%s] is not supported",
193 info->resolved_node->name.ascii,
194 acpi_ut_get_type_name(info->resolved_node->
195 type)));
196
197 return_ACPI_STATUS(AE_TYPE);
198
199 default:
200 break;
201 }
202
203 /*
204 * Objects require additional resolution steps (e.g., the Node may be
205 * a field that must be read, etc.) -- we can't just grab the object
206 * out of the node.
207 *
208 * Use resolve_node_to_value() to get the associated value.
209 *
210 * NOTE: we can get away with passing in NULL for a walk state because
211 * resolved_node is guaranteed to not be a reference to either a method
212 * local or a method argument (because this interface is never called
213 * from a running method.)
214 *
215 * Even though we do not directly invoke the interpreter for object
216 * resolution, we must lock it because we could access an opregion.
217 * The opregion access code assumes that the interpreter is locked.
218 */
219 acpi_ex_enter_interpreter();
220
221 /* Function has a strange interface */
222
223 status =
224 acpi_ex_resolve_node_to_value(&info->resolved_node, NULL);
225 acpi_ex_exit_interpreter();
226
227 /*
228 * If acpi_ex_resolve_node_to_value() succeeded, the return value was placed
229 * in resolved_node.
230 */
231 if (ACPI_SUCCESS(status)) {
232 status = AE_CTRL_RETURN_VALUE;
233 info->return_object =
234 ACPI_CAST_PTR(union acpi_operand_object,
235 info->resolved_node);
236
237 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
238 "Returning object %p [%s]\n",
239 info->return_object,
240 acpi_ut_get_object_type_name(info->
241 return_object)));
242 }
243 }
244
245 /*
246 * Check input argument count against the ASL-defined count for a method.
247 * Also check predefined names: argument count and return value against
248 * the ACPI specification. Some incorrect return value types are repaired.
249 */
250 (void)acpi_ns_check_predefined_names(node, info->param_count,
251 status, &info->return_object);
252
253 /* Check if there is a return value that must be dealt with */
254
255 if (status == AE_CTRL_RETURN_VALUE) {
256
257 /* If caller does not want the return value, delete it */
258
259 if (info->flags & ACPI_IGNORE_RETURN_VALUE) {
260 acpi_ut_remove_reference(info->return_object);
261 info->return_object = NULL;
262 }
263
264 /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
265
266 status = AE_OK;
267 }
268
269 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
270 "*** Completed evaluation of object %s ***\n",
271 info->pathname));
272
273 /*
274 * Namespace was unlocked by the handling acpi_ns* function, so we
275 * just return
276 */
277 return_ACPI_STATUS(status);
278}