1
2 /******************************************************************************
3 *
4 * Module Name: exsystem - Interface to OS services
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2012, Intel Corp.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
30 *
31 * NO WARRANTY
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acinterp.h"
48
49 #define _COMPONENT ACPI_EXECUTER
50 ACPI_MODULE_NAME("exsystem")
51
52 /*******************************************************************************
53 *
54 * FUNCTION: acpi_ex_system_wait_semaphore
55 *
56 * PARAMETERS: Semaphore - Semaphore to wait on
57 * Timeout - Max time to wait
58 *
59 * RETURN: Status
60 *
61 * DESCRIPTION: Implements a semaphore wait with a check to see if the
62 * semaphore is available immediately. If it is not, the
63 * interpreter is released before waiting.
64 *
65 ******************************************************************************/
acpi_ex_system_wait_semaphore(acpi_semaphore semaphore,u16 timeout)66 acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
67 {
68 acpi_status status;
69
70 ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
71
72 status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT);
73 if (ACPI_SUCCESS(status)) {
74 return_ACPI_STATUS(status);
75 }
76
77 if (status == AE_TIME) {
78
79 /* We must wait, so unlock the interpreter */
80
81 acpi_ex_relinquish_interpreter();
82
83 status = acpi_os_wait_semaphore(semaphore, 1, timeout);
84
85 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
86 "*** Thread awake after blocking, %s\n",
87 acpi_format_exception(status)));
88
89 /* Reacquire the interpreter */
90
91 acpi_ex_reacquire_interpreter();
92 }
93
94 return_ACPI_STATUS(status);
95 }
96
97 /*******************************************************************************
98 *
99 * FUNCTION: acpi_ex_system_wait_mutex
100 *
101 * PARAMETERS: Mutex - Mutex to wait on
102 * Timeout - Max time to wait
103 *
104 * RETURN: Status
105 *
106 * DESCRIPTION: Implements a mutex wait with a check to see if the
107 * mutex is available immediately. If it is not, the
108 * interpreter is released before waiting.
109 *
110 ******************************************************************************/
111
acpi_ex_system_wait_mutex(acpi_mutex mutex,u16 timeout)112 acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
113 {
114 acpi_status status;
115
116 ACPI_FUNCTION_TRACE(ex_system_wait_mutex);
117
118 status = acpi_os_acquire_mutex(mutex, ACPI_DO_NOT_WAIT);
119 if (ACPI_SUCCESS(status)) {
120 return_ACPI_STATUS(status);
121 }
122
123 if (status == AE_TIME) {
124
125 /* We must wait, so unlock the interpreter */
126
127 acpi_ex_relinquish_interpreter();
128
129 status = acpi_os_acquire_mutex(mutex, timeout);
130
131 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
132 "*** Thread awake after blocking, %s\n",
133 acpi_format_exception(status)));
134
135 /* Reacquire the interpreter */
136
137 acpi_ex_reacquire_interpreter();
138 }
139
140 return_ACPI_STATUS(status);
141 }
142
143 /*******************************************************************************
144 *
145 * FUNCTION: acpi_ex_system_do_stall
146 *
147 * PARAMETERS: how_long - The amount of time to stall,
148 * in microseconds
149 *
150 * RETURN: Status
151 *
152 * DESCRIPTION: Suspend running thread for specified amount of time.
153 * Note: ACPI specification requires that Stall() does not
154 * relinquish the processor, and delays longer than 100 usec
155 * should use Sleep() instead. We allow stalls up to 255 usec
156 * for compatibility with other interpreters and existing BIOSs.
157 *
158 ******************************************************************************/
159
acpi_ex_system_do_stall(u32 how_long)160 acpi_status acpi_ex_system_do_stall(u32 how_long)
161 {
162 acpi_status status = AE_OK;
163
164 ACPI_FUNCTION_ENTRY();
165
166 if (how_long > 255) { /* 255 microseconds */
167 /*
168 * Longer than 255 usec, this is an error
169 *
170 * (ACPI specifies 100 usec as max, but this gives some slack in
171 * order to support existing BIOSs)
172 */
173 ACPI_ERROR((AE_INFO, "Time parameter is too large (%u)",
174 how_long));
175 status = AE_AML_OPERAND_VALUE;
176 } else {
177 acpi_os_stall(how_long);
178 }
179
180 return (status);
181 }
182
183 /*******************************************************************************
184 *
185 * FUNCTION: acpi_ex_system_do_sleep
186 *
187 * PARAMETERS: how_long - The amount of time to sleep,
188 * in milliseconds
189 *
190 * RETURN: None
191 *
192 * DESCRIPTION: Sleep the running thread for specified amount of time.
193 *
194 ******************************************************************************/
195
acpi_ex_system_do_sleep(u64 how_long)196 acpi_status acpi_ex_system_do_sleep(u64 how_long)
197 {
198 ACPI_FUNCTION_ENTRY();
199
200 /* Since this thread will sleep, we must release the interpreter */
201
202 acpi_ex_relinquish_interpreter();
203
204 /*
205 * For compatibility with other ACPI implementations and to prevent
206 * accidental deep sleeps, limit the sleep time to something reasonable.
207 */
208 if (how_long > ACPI_MAX_SLEEP) {
209 how_long = ACPI_MAX_SLEEP;
210 }
211
212 acpi_os_sleep(how_long);
213
214 /* And now we must get the interpreter again */
215
216 acpi_ex_reacquire_interpreter();
217 return (AE_OK);
218 }
219
220 /*******************************************************************************
221 *
222 * FUNCTION: acpi_ex_system_signal_event
223 *
224 * PARAMETERS: obj_desc - The object descriptor for this op
225 *
226 * RETURN: Status
227 *
228 * DESCRIPTION: Provides an access point to perform synchronization operations
229 * within the AML.
230 *
231 ******************************************************************************/
232
acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)233 acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)
234 {
235 acpi_status status = AE_OK;
236
237 ACPI_FUNCTION_TRACE(ex_system_signal_event);
238
239 if (obj_desc) {
240 status =
241 acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1);
242 }
243
244 return_ACPI_STATUS(status);
245 }
246
247 /*******************************************************************************
248 *
249 * FUNCTION: acpi_ex_system_wait_event
250 *
251 * PARAMETERS: time_desc - The 'time to delay' object descriptor
252 * obj_desc - The object descriptor for this op
253 *
254 * RETURN: Status
255 *
256 * DESCRIPTION: Provides an access point to perform synchronization operations
257 * within the AML. This operation is a request to wait for an
258 * event.
259 *
260 ******************************************************************************/
261
262 acpi_status
acpi_ex_system_wait_event(union acpi_operand_object * time_desc,union acpi_operand_object * obj_desc)263 acpi_ex_system_wait_event(union acpi_operand_object *time_desc,
264 union acpi_operand_object *obj_desc)
265 {
266 acpi_status status = AE_OK;
267
268 ACPI_FUNCTION_TRACE(ex_system_wait_event);
269
270 if (obj_desc) {
271 status =
272 acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore,
273 (u16) time_desc->integer.
274 value);
275 }
276
277 return_ACPI_STATUS(status);
278 }
279
280 /*******************************************************************************
281 *
282 * FUNCTION: acpi_ex_system_reset_event
283 *
284 * PARAMETERS: obj_desc - The object descriptor for this op
285 *
286 * RETURN: Status
287 *
288 * DESCRIPTION: Reset an event to a known state.
289 *
290 ******************************************************************************/
291
acpi_ex_system_reset_event(union acpi_operand_object * obj_desc)292 acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
293 {
294 acpi_status status = AE_OK;
295 acpi_semaphore temp_semaphore;
296
297 ACPI_FUNCTION_ENTRY();
298
299 /*
300 * We are going to simply delete the existing semaphore and
301 * create a new one!
302 */
303 status =
304 acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
305 if (ACPI_SUCCESS(status)) {
306 (void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore);
307 obj_desc->event.os_semaphore = temp_semaphore;
308 }
309
310 return (status);
311 }
312