1 /******************************************************************************
2 *
3 * Module Name: exsystem - Interface to OS services
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 "acinterp.h"
47
48 #define _COMPONENT ACPI_EXECUTER
49 ACPI_MODULE_NAME("exsystem")
50
51 /*******************************************************************************
52 *
53 * FUNCTION: acpi_ex_system_wait_semaphore
54 *
55 * PARAMETERS: semaphore - Semaphore to wait on
56 * timeout - Max time to wait
57 *
58 * RETURN: Status
59 *
60 * DESCRIPTION: Implements a semaphore wait with a check to see if the
61 * semaphore is available immediately. If it is not, the
62 * interpreter is released before waiting.
63 *
64 ******************************************************************************/
acpi_ex_system_wait_semaphore(acpi_semaphore semaphore,u16 timeout)65 acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
66 {
67 acpi_status status;
68
69 ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
70
71 status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT);
72 if (ACPI_SUCCESS(status)) {
73 return_ACPI_STATUS(status);
74 }
75
76 if (status == AE_TIME) {
77
78 /* We must wait, so unlock the interpreter */
79
80 acpi_ex_relinquish_interpreter();
81
82 status = acpi_os_wait_semaphore(semaphore, 1, timeout);
83
84 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
85 "*** Thread awake after blocking, %s\n",
86 acpi_format_exception(status)));
87
88 /* Reacquire the interpreter */
89
90 acpi_ex_reacquire_interpreter();
91 }
92
93 return_ACPI_STATUS(status);
94 }
95
96 /*******************************************************************************
97 *
98 * FUNCTION: acpi_ex_system_wait_mutex
99 *
100 * PARAMETERS: mutex - Mutex to wait on
101 * timeout - Max time to wait
102 *
103 * RETURN: Status
104 *
105 * DESCRIPTION: Implements a mutex wait with a check to see if the
106 * mutex is available immediately. If it is not, the
107 * interpreter is released before waiting.
108 *
109 ******************************************************************************/
110
acpi_ex_system_wait_mutex(acpi_mutex mutex,u16 timeout)111 acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
112 {
113 acpi_status status;
114
115 ACPI_FUNCTION_TRACE(ex_system_wait_mutex);
116
117 status = acpi_os_acquire_mutex(mutex, ACPI_DO_NOT_WAIT);
118 if (ACPI_SUCCESS(status)) {
119 return_ACPI_STATUS(status);
120 }
121
122 if (status == AE_TIME) {
123
124 /* We must wait, so unlock the interpreter */
125
126 acpi_ex_relinquish_interpreter();
127
128 status = acpi_os_acquire_mutex(mutex, timeout);
129
130 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
131 "*** Thread awake after blocking, %s\n",
132 acpi_format_exception(status)));
133
134 /* Reacquire the interpreter */
135
136 acpi_ex_reacquire_interpreter();
137 }
138
139 return_ACPI_STATUS(status);
140 }
141
142 /*******************************************************************************
143 *
144 * FUNCTION: acpi_ex_system_do_stall
145 *
146 * PARAMETERS: how_long - The amount of time to stall,
147 * in microseconds
148 *
149 * RETURN: Status
150 *
151 * DESCRIPTION: Suspend running thread for specified amount of time.
152 * Note: ACPI specification requires that Stall() does not
153 * relinquish the processor, and delays longer than 100 usec
154 * should use Sleep() instead. We allow stalls up to 255 usec
155 * for compatibility with other interpreters and existing BIOSs.
156 *
157 ******************************************************************************/
158
acpi_ex_system_do_stall(u32 how_long)159 acpi_status acpi_ex_system_do_stall(u32 how_long)
160 {
161 acpi_status status = AE_OK;
162
163 ACPI_FUNCTION_ENTRY();
164
165 if (how_long > 255) { /* 255 microseconds */
166 /*
167 * Longer than 255 usec, this is an error
168 *
169 * (ACPI specifies 100 usec as max, but this gives some slack in
170 * order to support existing BIOSs)
171 */
172 ACPI_ERROR((AE_INFO, "Time parameter is too large (%u)",
173 how_long));
174 status = AE_AML_OPERAND_VALUE;
175 } else {
176 acpi_os_stall(how_long);
177 }
178
179 return (status);
180 }
181
182 /*******************************************************************************
183 *
184 * FUNCTION: acpi_ex_system_do_sleep
185 *
186 * PARAMETERS: how_long - The amount of time to sleep,
187 * in milliseconds
188 *
189 * RETURN: None
190 *
191 * DESCRIPTION: Sleep the running thread for specified amount of time.
192 *
193 ******************************************************************************/
194
acpi_ex_system_do_sleep(u64 how_long)195 acpi_status acpi_ex_system_do_sleep(u64 how_long)
196 {
197 ACPI_FUNCTION_ENTRY();
198
199 /* Since this thread will sleep, we must release the interpreter */
200
201 acpi_ex_relinquish_interpreter();
202
203 /*
204 * For compatibility with other ACPI implementations and to prevent
205 * accidental deep sleeps, limit the sleep time to something reasonable.
206 */
207 if (how_long > ACPI_MAX_SLEEP) {
208 how_long = ACPI_MAX_SLEEP;
209 }
210
211 acpi_os_sleep(how_long);
212
213 /* And now we must get the interpreter again */
214
215 acpi_ex_reacquire_interpreter();
216 return (AE_OK);
217 }
218
219 /*******************************************************************************
220 *
221 * FUNCTION: acpi_ex_system_signal_event
222 *
223 * PARAMETERS: obj_desc - The object descriptor for this op
224 *
225 * RETURN: Status
226 *
227 * DESCRIPTION: Provides an access point to perform synchronization operations
228 * within the AML.
229 *
230 ******************************************************************************/
231
acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)232 acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)
233 {
234 acpi_status status = AE_OK;
235
236 ACPI_FUNCTION_TRACE(ex_system_signal_event);
237
238 if (obj_desc) {
239 status =
240 acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1);
241 }
242
243 return_ACPI_STATUS(status);
244 }
245
246 /*******************************************************************************
247 *
248 * FUNCTION: acpi_ex_system_wait_event
249 *
250 * PARAMETERS: time_desc - The 'time to delay' object descriptor
251 * obj_desc - The object descriptor for this op
252 *
253 * RETURN: Status
254 *
255 * DESCRIPTION: Provides an access point to perform synchronization operations
256 * within the AML. This operation is a request to wait for an
257 * event.
258 *
259 ******************************************************************************/
260
261 acpi_status
acpi_ex_system_wait_event(union acpi_operand_object * time_desc,union acpi_operand_object * obj_desc)262 acpi_ex_system_wait_event(union acpi_operand_object *time_desc,
263 union acpi_operand_object *obj_desc)
264 {
265 acpi_status status = AE_OK;
266
267 ACPI_FUNCTION_TRACE(ex_system_wait_event);
268
269 if (obj_desc) {
270 status =
271 acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore,
272 (u16) time_desc->integer.
273 value);
274 }
275
276 return_ACPI_STATUS(status);
277 }
278
279 /*******************************************************************************
280 *
281 * FUNCTION: acpi_ex_system_reset_event
282 *
283 * PARAMETERS: obj_desc - The object descriptor for this op
284 *
285 * RETURN: Status
286 *
287 * DESCRIPTION: Reset an event to a known state.
288 *
289 ******************************************************************************/
290
acpi_ex_system_reset_event(union acpi_operand_object * obj_desc)291 acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
292 {
293 acpi_status status = AE_OK;
294 acpi_semaphore temp_semaphore;
295
296 ACPI_FUNCTION_ENTRY();
297
298 /*
299 * We are going to simply delete the existing semaphore and
300 * create a new one!
301 */
302 status =
303 acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
304 if (ACPI_SUCCESS(status)) {
305 (void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore);
306 obj_desc->event.os_semaphore = temp_semaphore;
307 }
308
309 return (status);
310 }
311