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1da177e4 LT |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: exsystem - Interface to OS services | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
4a90c7e8 | 9 | * Copyright (C) 2000 - 2006, R. Byron Moore |
1da177e4 LT |
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 | ||
1da177e4 LT |
45 | #include <acpi/acpi.h> |
46 | #include <acpi/acinterp.h> | |
47 | #include <acpi/acevents.h> | |
48 | ||
49 | #define _COMPONENT ACPI_EXECUTER | |
4be44fcd | 50 | ACPI_MODULE_NAME("exsystem") |
1da177e4 LT |
51 | |
52 | /******************************************************************************* | |
53 | * | |
54 | * FUNCTION: acpi_ex_system_wait_semaphore | |
55 | * | |
44f6c012 RM |
56 | * PARAMETERS: Semaphore - Semaphore to wait on |
57 | * Timeout - Max time to wait | |
1da177e4 LT |
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. | |
64 | * | |
65 | ******************************************************************************/ | |
967440e3 | 66 | acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout) |
1da177e4 | 67 | { |
4be44fcd LB |
68 | acpi_status status; |
69 | acpi_status status2; | |
1da177e4 | 70 | |
b229cf92 | 71 | ACPI_FUNCTION_TRACE(ex_system_wait_semaphore); |
1da177e4 | 72 | |
967440e3 | 73 | status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT); |
4be44fcd LB |
74 | if (ACPI_SUCCESS(status)) { |
75 | return_ACPI_STATUS(status); | |
1da177e4 LT |
76 | } |
77 | ||
78 | if (status == AE_TIME) { | |
52fc0b02 | 79 | |
1da177e4 LT |
80 | /* We must wait, so unlock the interpreter */ |
81 | ||
4be44fcd | 82 | acpi_ex_exit_interpreter(); |
1da177e4 | 83 | |
4be44fcd | 84 | status = acpi_os_wait_semaphore(semaphore, 1, timeout); |
1da177e4 | 85 | |
4be44fcd LB |
86 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
87 | "*** Thread awake after blocking, %s\n", | |
88 | acpi_format_exception(status))); | |
1da177e4 LT |
89 | |
90 | /* Reacquire the interpreter */ | |
91 | ||
4be44fcd LB |
92 | status2 = acpi_ex_enter_interpreter(); |
93 | if (ACPI_FAILURE(status2)) { | |
52fc0b02 | 94 | |
1da177e4 LT |
95 | /* Report fatal error, could not acquire interpreter */ |
96 | ||
4be44fcd | 97 | return_ACPI_STATUS(status2); |
1da177e4 LT |
98 | } |
99 | } | |
100 | ||
4be44fcd | 101 | return_ACPI_STATUS(status); |
1da177e4 LT |
102 | } |
103 | ||
967440e3 BM |
104 | /******************************************************************************* |
105 | * | |
106 | * FUNCTION: acpi_ex_system_wait_mutex | |
107 | * | |
108 | * PARAMETERS: Mutex - Mutex to wait on | |
109 | * Timeout - Max time to wait | |
110 | * | |
111 | * RETURN: Status | |
112 | * | |
113 | * DESCRIPTION: Implements a semaphore wait with a check to see if the | |
114 | * semaphore is available immediately. If it is not, the | |
115 | * interpreter is released. | |
116 | * | |
117 | ******************************************************************************/ | |
118 | ||
119 | acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout) | |
120 | { | |
121 | acpi_status status; | |
122 | acpi_status status2; | |
123 | ||
124 | ACPI_FUNCTION_TRACE(ex_system_wait_mutex); | |
125 | ||
126 | status = acpi_os_acquire_mutex(mutex, ACPI_DO_NOT_WAIT); | |
127 | if (ACPI_SUCCESS(status)) { | |
128 | return_ACPI_STATUS(status); | |
129 | } | |
130 | ||
131 | if (status == AE_TIME) { | |
132 | ||
133 | /* We must wait, so unlock the interpreter */ | |
134 | ||
135 | acpi_ex_exit_interpreter(); | |
136 | ||
137 | status = acpi_os_acquire_mutex(mutex, timeout); | |
138 | ||
139 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, | |
140 | "*** Thread awake after blocking, %s\n", | |
141 | acpi_format_exception(status))); | |
142 | ||
143 | /* Reacquire the interpreter */ | |
144 | ||
145 | status2 = acpi_ex_enter_interpreter(); | |
146 | if (ACPI_FAILURE(status2)) { | |
147 | ||
148 | /* Report fatal error, could not acquire interpreter */ | |
149 | ||
150 | return_ACPI_STATUS(status2); | |
151 | } | |
152 | } | |
153 | ||
154 | return_ACPI_STATUS(status); | |
155 | } | |
156 | ||
1da177e4 LT |
157 | /******************************************************************************* |
158 | * | |
159 | * FUNCTION: acpi_ex_system_do_stall | |
160 | * | |
44f6c012 RM |
161 | * PARAMETERS: how_long - The amount of time to stall, |
162 | * in microseconds | |
1da177e4 LT |
163 | * |
164 | * RETURN: Status | |
165 | * | |
166 | * DESCRIPTION: Suspend running thread for specified amount of time. | |
167 | * Note: ACPI specification requires that Stall() does not | |
168 | * relinquish the processor, and delays longer than 100 usec | |
169 | * should use Sleep() instead. We allow stalls up to 255 usec | |
170 | * for compatibility with other interpreters and existing BIOSs. | |
171 | * | |
172 | ******************************************************************************/ | |
173 | ||
4be44fcd | 174 | acpi_status acpi_ex_system_do_stall(u32 how_long) |
1da177e4 | 175 | { |
4be44fcd | 176 | acpi_status status = AE_OK; |
1da177e4 | 177 | |
4be44fcd | 178 | ACPI_FUNCTION_ENTRY(); |
1da177e4 | 179 | |
4be44fcd | 180 | if (how_long > 255) { /* 255 microseconds */ |
1da177e4 LT |
181 | /* |
182 | * Longer than 255 usec, this is an error | |
183 | * | |
184 | * (ACPI specifies 100 usec as max, but this gives some slack in | |
185 | * order to support existing BIOSs) | |
186 | */ | |
b8e4d893 BM |
187 | ACPI_ERROR((AE_INFO, "Time parameter is too large (%d)", |
188 | how_long)); | |
1da177e4 | 189 | status = AE_AML_OPERAND_VALUE; |
4be44fcd LB |
190 | } else { |
191 | acpi_os_stall(how_long); | |
1da177e4 LT |
192 | } |
193 | ||
194 | return (status); | |
195 | } | |
196 | ||
1da177e4 LT |
197 | /******************************************************************************* |
198 | * | |
199 | * FUNCTION: acpi_ex_system_do_suspend | |
200 | * | |
44f6c012 RM |
201 | * PARAMETERS: how_long - The amount of time to suspend, |
202 | * in milliseconds | |
1da177e4 LT |
203 | * |
204 | * RETURN: None | |
205 | * | |
206 | * DESCRIPTION: Suspend running thread for specified amount of time. | |
207 | * | |
208 | ******************************************************************************/ | |
209 | ||
4be44fcd | 210 | acpi_status acpi_ex_system_do_suspend(acpi_integer how_long) |
1da177e4 | 211 | { |
4be44fcd | 212 | acpi_status status; |
1da177e4 | 213 | |
4be44fcd | 214 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
215 | |
216 | /* Since this thread will sleep, we must release the interpreter */ | |
217 | ||
4be44fcd | 218 | acpi_ex_exit_interpreter(); |
1da177e4 | 219 | |
4be44fcd | 220 | acpi_os_sleep(how_long); |
1da177e4 LT |
221 | |
222 | /* And now we must get the interpreter again */ | |
223 | ||
4be44fcd | 224 | status = acpi_ex_enter_interpreter(); |
1da177e4 LT |
225 | return (status); |
226 | } | |
227 | ||
1da177e4 LT |
228 | /******************************************************************************* |
229 | * | |
230 | * FUNCTION: acpi_ex_system_acquire_mutex | |
231 | * | |
967440e3 | 232 | * PARAMETERS: time_desc - Maximum time to wait for the mutex |
44f6c012 | 233 | * obj_desc - The object descriptor for this op |
1da177e4 LT |
234 | * |
235 | * RETURN: Status | |
236 | * | |
237 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
238 | * within the AML. This function will cause a lock to be generated | |
239 | * for the Mutex pointed to by obj_desc. | |
240 | * | |
241 | ******************************************************************************/ | |
242 | ||
243 | acpi_status | |
4be44fcd LB |
244 | acpi_ex_system_acquire_mutex(union acpi_operand_object * time_desc, |
245 | union acpi_operand_object * obj_desc) | |
1da177e4 | 246 | { |
4be44fcd | 247 | acpi_status status = AE_OK; |
1da177e4 | 248 | |
b229cf92 | 249 | ACPI_FUNCTION_TRACE_PTR(ex_system_acquire_mutex, obj_desc); |
1da177e4 LT |
250 | |
251 | if (!obj_desc) { | |
4be44fcd | 252 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
253 | } |
254 | ||
44f6c012 RM |
255 | /* Support for the _GL_ Mutex object -- go get the global lock */ |
256 | ||
967440e3 | 257 | if (obj_desc->mutex.os_mutex == ACPI_GLOBAL_LOCK) { |
4be44fcd LB |
258 | status = |
259 | acpi_ev_acquire_global_lock((u16) time_desc->integer.value); | |
260 | return_ACPI_STATUS(status); | |
1da177e4 LT |
261 | } |
262 | ||
967440e3 BM |
263 | status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex, |
264 | (u16) time_desc->integer.value); | |
4be44fcd | 265 | return_ACPI_STATUS(status); |
1da177e4 LT |
266 | } |
267 | ||
1da177e4 LT |
268 | /******************************************************************************* |
269 | * | |
270 | * FUNCTION: acpi_ex_system_release_mutex | |
271 | * | |
44f6c012 | 272 | * PARAMETERS: obj_desc - The object descriptor for this op |
1da177e4 LT |
273 | * |
274 | * RETURN: Status | |
275 | * | |
276 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
277 | * within the AML. This operation is a request to release a | |
278 | * previously acquired Mutex. If the Mutex variable is set then | |
279 | * it will be decremented. | |
280 | * | |
281 | ******************************************************************************/ | |
282 | ||
4be44fcd | 283 | acpi_status acpi_ex_system_release_mutex(union acpi_operand_object *obj_desc) |
1da177e4 | 284 | { |
4be44fcd | 285 | acpi_status status = AE_OK; |
1da177e4 | 286 | |
b229cf92 | 287 | ACPI_FUNCTION_TRACE(ex_system_release_mutex); |
1da177e4 LT |
288 | |
289 | if (!obj_desc) { | |
4be44fcd | 290 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
291 | } |
292 | ||
44f6c012 RM |
293 | /* Support for the _GL_ Mutex object -- release the global lock */ |
294 | ||
967440e3 | 295 | if (obj_desc->mutex.os_mutex == ACPI_GLOBAL_LOCK) { |
4be44fcd LB |
296 | status = acpi_ev_release_global_lock(); |
297 | return_ACPI_STATUS(status); | |
1da177e4 LT |
298 | } |
299 | ||
967440e3 BM |
300 | acpi_os_release_mutex(obj_desc->mutex.os_mutex); |
301 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
302 | } |
303 | ||
1da177e4 LT |
304 | /******************************************************************************* |
305 | * | |
306 | * FUNCTION: acpi_ex_system_signal_event | |
307 | * | |
44f6c012 | 308 | * PARAMETERS: obj_desc - The object descriptor for this op |
1da177e4 | 309 | * |
44f6c012 | 310 | * RETURN: Status |
1da177e4 LT |
311 | * |
312 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
313 | * within the AML. | |
314 | * | |
315 | ******************************************************************************/ | |
316 | ||
4be44fcd | 317 | acpi_status acpi_ex_system_signal_event(union acpi_operand_object *obj_desc) |
1da177e4 | 318 | { |
4be44fcd | 319 | acpi_status status = AE_OK; |
1da177e4 | 320 | |
b229cf92 | 321 | ACPI_FUNCTION_TRACE(ex_system_signal_event); |
1da177e4 LT |
322 | |
323 | if (obj_desc) { | |
967440e3 BM |
324 | status = |
325 | acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1); | |
1da177e4 LT |
326 | } |
327 | ||
4be44fcd | 328 | return_ACPI_STATUS(status); |
1da177e4 LT |
329 | } |
330 | ||
1da177e4 LT |
331 | /******************************************************************************* |
332 | * | |
333 | * FUNCTION: acpi_ex_system_wait_event | |
334 | * | |
44f6c012 RM |
335 | * PARAMETERS: time_desc - The 'time to delay' object descriptor |
336 | * obj_desc - The object descriptor for this op | |
1da177e4 LT |
337 | * |
338 | * RETURN: Status | |
339 | * | |
340 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
341 | * within the AML. This operation is a request to wait for an | |
342 | * event. | |
343 | * | |
344 | ******************************************************************************/ | |
345 | ||
346 | acpi_status | |
4be44fcd LB |
347 | acpi_ex_system_wait_event(union acpi_operand_object *time_desc, |
348 | union acpi_operand_object *obj_desc) | |
1da177e4 | 349 | { |
4be44fcd | 350 | acpi_status status = AE_OK; |
1da177e4 | 351 | |
b229cf92 | 352 | ACPI_FUNCTION_TRACE(ex_system_wait_event); |
1da177e4 LT |
353 | |
354 | if (obj_desc) { | |
4be44fcd | 355 | status = |
967440e3 | 356 | acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore, |
4be44fcd LB |
357 | (u16) time_desc->integer. |
358 | value); | |
1da177e4 LT |
359 | } |
360 | ||
4be44fcd | 361 | return_ACPI_STATUS(status); |
1da177e4 LT |
362 | } |
363 | ||
1da177e4 LT |
364 | /******************************************************************************* |
365 | * | |
366 | * FUNCTION: acpi_ex_system_reset_event | |
367 | * | |
44f6c012 | 368 | * PARAMETERS: obj_desc - The object descriptor for this op |
1da177e4 LT |
369 | * |
370 | * RETURN: Status | |
371 | * | |
372 | * DESCRIPTION: Reset an event to a known state. | |
373 | * | |
374 | ******************************************************************************/ | |
375 | ||
4be44fcd | 376 | acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc) |
1da177e4 | 377 | { |
4be44fcd | 378 | acpi_status status = AE_OK; |
967440e3 | 379 | acpi_semaphore temp_semaphore; |
1da177e4 | 380 | |
4be44fcd | 381 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
382 | |
383 | /* | |
384 | * We are going to simply delete the existing semaphore and | |
385 | * create a new one! | |
386 | */ | |
4be44fcd LB |
387 | status = |
388 | acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore); | |
389 | if (ACPI_SUCCESS(status)) { | |
967440e3 BM |
390 | (void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore); |
391 | obj_desc->event.os_semaphore = temp_semaphore; | |
1da177e4 LT |
392 | } |
393 | ||
394 | return (status); | |
395 | } |