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1da177e4 LT |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: exsystem - Interface to OS services | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
9 | * Copyright (C) 2000 - 2005, R. Byron Moore | |
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 | ||
46 | #include <acpi/acpi.h> | |
47 | #include <acpi/acinterp.h> | |
48 | #include <acpi/acevents.h> | |
49 | ||
50 | #define _COMPONENT ACPI_EXECUTER | |
51 | ACPI_MODULE_NAME ("exsystem") | |
52 | ||
53 | ||
54 | /******************************************************************************* | |
55 | * | |
56 | * FUNCTION: acpi_ex_system_wait_semaphore | |
57 | * | |
44f6c012 RM |
58 | * PARAMETERS: Semaphore - Semaphore to wait on |
59 | * Timeout - Max time to wait | |
1da177e4 LT |
60 | * |
61 | * RETURN: Status | |
62 | * | |
63 | * DESCRIPTION: Implements a semaphore wait with a check to see if the | |
64 | * semaphore is available immediately. If it is not, the | |
65 | * interpreter is released. | |
66 | * | |
67 | ******************************************************************************/ | |
68 | ||
69 | acpi_status | |
70 | acpi_ex_system_wait_semaphore ( | |
71 | acpi_handle semaphore, | |
72 | u16 timeout) | |
73 | { | |
74 | acpi_status status; | |
75 | acpi_status status2; | |
76 | ||
77 | ||
78 | ACPI_FUNCTION_TRACE ("ex_system_wait_semaphore"); | |
79 | ||
80 | ||
81 | status = acpi_os_wait_semaphore (semaphore, 1, 0); | |
82 | if (ACPI_SUCCESS (status)) { | |
83 | return_ACPI_STATUS (status); | |
84 | } | |
85 | ||
86 | if (status == AE_TIME) { | |
87 | /* We must wait, so unlock the interpreter */ | |
88 | ||
89 | acpi_ex_exit_interpreter (); | |
90 | ||
91 | status = acpi_os_wait_semaphore (semaphore, 1, timeout); | |
92 | ||
44f6c012 RM |
93 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
94 | "*** Thread awake after blocking, %s\n", | |
1da177e4 LT |
95 | acpi_format_exception (status))); |
96 | ||
97 | /* Reacquire the interpreter */ | |
98 | ||
99 | status2 = acpi_ex_enter_interpreter (); | |
100 | if (ACPI_FAILURE (status2)) { | |
101 | /* Report fatal error, could not acquire interpreter */ | |
102 | ||
103 | return_ACPI_STATUS (status2); | |
104 | } | |
105 | } | |
106 | ||
107 | return_ACPI_STATUS (status); | |
108 | } | |
109 | ||
110 | ||
111 | /******************************************************************************* | |
112 | * | |
113 | * FUNCTION: acpi_ex_system_do_stall | |
114 | * | |
44f6c012 RM |
115 | * PARAMETERS: how_long - The amount of time to stall, |
116 | * in microseconds | |
1da177e4 LT |
117 | * |
118 | * RETURN: Status | |
119 | * | |
120 | * DESCRIPTION: Suspend running thread for specified amount of time. | |
121 | * Note: ACPI specification requires that Stall() does not | |
122 | * relinquish the processor, and delays longer than 100 usec | |
123 | * should use Sleep() instead. We allow stalls up to 255 usec | |
124 | * for compatibility with other interpreters and existing BIOSs. | |
125 | * | |
126 | ******************************************************************************/ | |
127 | ||
128 | acpi_status | |
129 | acpi_ex_system_do_stall ( | |
130 | u32 how_long) | |
131 | { | |
132 | acpi_status status = AE_OK; | |
133 | ||
134 | ||
135 | ACPI_FUNCTION_ENTRY (); | |
136 | ||
137 | ||
138 | if (how_long > 255) /* 255 microseconds */ { | |
139 | /* | |
140 | * Longer than 255 usec, this is an error | |
141 | * | |
142 | * (ACPI specifies 100 usec as max, but this gives some slack in | |
143 | * order to support existing BIOSs) | |
144 | */ | |
44f6c012 RM |
145 | ACPI_REPORT_ERROR (("Stall: Time parameter is too large (%d)\n", |
146 | how_long)); | |
1da177e4 LT |
147 | status = AE_AML_OPERAND_VALUE; |
148 | } | |
149 | else { | |
150 | acpi_os_stall (how_long); | |
151 | } | |
152 | ||
153 | return (status); | |
154 | } | |
155 | ||
156 | ||
157 | /******************************************************************************* | |
158 | * | |
159 | * FUNCTION: acpi_ex_system_do_suspend | |
160 | * | |
44f6c012 RM |
161 | * PARAMETERS: how_long - The amount of time to suspend, |
162 | * in milliseconds | |
1da177e4 LT |
163 | * |
164 | * RETURN: None | |
165 | * | |
166 | * DESCRIPTION: Suspend running thread for specified amount of time. | |
167 | * | |
168 | ******************************************************************************/ | |
169 | ||
170 | acpi_status | |
171 | acpi_ex_system_do_suspend ( | |
172 | acpi_integer how_long) | |
173 | { | |
174 | acpi_status status; | |
175 | ||
176 | ||
177 | ACPI_FUNCTION_ENTRY (); | |
178 | ||
179 | ||
180 | /* Since this thread will sleep, we must release the interpreter */ | |
181 | ||
182 | acpi_ex_exit_interpreter (); | |
183 | ||
184 | acpi_os_sleep (how_long); | |
185 | ||
186 | /* And now we must get the interpreter again */ | |
187 | ||
188 | status = acpi_ex_enter_interpreter (); | |
189 | return (status); | |
190 | } | |
191 | ||
192 | ||
193 | /******************************************************************************* | |
194 | * | |
195 | * FUNCTION: acpi_ex_system_acquire_mutex | |
196 | * | |
44f6c012 RM |
197 | * PARAMETERS: time_desc - The 'time to delay' object descriptor |
198 | * obj_desc - The object descriptor for this op | |
1da177e4 LT |
199 | * |
200 | * RETURN: Status | |
201 | * | |
202 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
203 | * within the AML. This function will cause a lock to be generated | |
204 | * for the Mutex pointed to by obj_desc. | |
205 | * | |
206 | ******************************************************************************/ | |
207 | ||
208 | acpi_status | |
209 | acpi_ex_system_acquire_mutex ( | |
210 | union acpi_operand_object *time_desc, | |
211 | union acpi_operand_object *obj_desc) | |
212 | { | |
213 | acpi_status status = AE_OK; | |
214 | ||
215 | ||
216 | ACPI_FUNCTION_TRACE_PTR ("ex_system_acquire_mutex", obj_desc); | |
217 | ||
218 | ||
219 | if (!obj_desc) { | |
220 | return_ACPI_STATUS (AE_BAD_PARAMETER); | |
221 | } | |
222 | ||
44f6c012 RM |
223 | /* Support for the _GL_ Mutex object -- go get the global lock */ |
224 | ||
1da177e4 LT |
225 | if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) { |
226 | status = acpi_ev_acquire_global_lock ((u16) time_desc->integer.value); | |
227 | return_ACPI_STATUS (status); | |
228 | } | |
229 | ||
230 | status = acpi_ex_system_wait_semaphore (obj_desc->mutex.semaphore, | |
44f6c012 | 231 | (u16) time_desc->integer.value); |
1da177e4 LT |
232 | return_ACPI_STATUS (status); |
233 | } | |
234 | ||
235 | ||
236 | /******************************************************************************* | |
237 | * | |
238 | * FUNCTION: acpi_ex_system_release_mutex | |
239 | * | |
44f6c012 | 240 | * PARAMETERS: obj_desc - The object descriptor for this op |
1da177e4 LT |
241 | * |
242 | * RETURN: Status | |
243 | * | |
244 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
245 | * within the AML. This operation is a request to release a | |
246 | * previously acquired Mutex. If the Mutex variable is set then | |
247 | * it will be decremented. | |
248 | * | |
249 | ******************************************************************************/ | |
250 | ||
251 | acpi_status | |
252 | acpi_ex_system_release_mutex ( | |
253 | union acpi_operand_object *obj_desc) | |
254 | { | |
255 | acpi_status status = AE_OK; | |
256 | ||
257 | ||
258 | ACPI_FUNCTION_TRACE ("ex_system_release_mutex"); | |
259 | ||
260 | ||
261 | if (!obj_desc) { | |
262 | return_ACPI_STATUS (AE_BAD_PARAMETER); | |
263 | } | |
264 | ||
44f6c012 RM |
265 | /* Support for the _GL_ Mutex object -- release the global lock */ |
266 | ||
1da177e4 LT |
267 | if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) { |
268 | status = acpi_ev_release_global_lock (); | |
269 | return_ACPI_STATUS (status); | |
270 | } | |
271 | ||
272 | status = acpi_os_signal_semaphore (obj_desc->mutex.semaphore, 1); | |
273 | return_ACPI_STATUS (status); | |
274 | } | |
275 | ||
276 | ||
277 | /******************************************************************************* | |
278 | * | |
279 | * FUNCTION: acpi_ex_system_signal_event | |
280 | * | |
44f6c012 | 281 | * PARAMETERS: obj_desc - The object descriptor for this op |
1da177e4 | 282 | * |
44f6c012 | 283 | * RETURN: Status |
1da177e4 LT |
284 | * |
285 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
286 | * within the AML. | |
287 | * | |
288 | ******************************************************************************/ | |
289 | ||
290 | acpi_status | |
291 | acpi_ex_system_signal_event ( | |
292 | union acpi_operand_object *obj_desc) | |
293 | { | |
294 | acpi_status status = AE_OK; | |
295 | ||
296 | ||
297 | ACPI_FUNCTION_TRACE ("ex_system_signal_event"); | |
298 | ||
299 | ||
300 | if (obj_desc) { | |
301 | status = acpi_os_signal_semaphore (obj_desc->event.semaphore, 1); | |
302 | } | |
303 | ||
304 | return_ACPI_STATUS (status); | |
305 | } | |
306 | ||
307 | ||
308 | /******************************************************************************* | |
309 | * | |
310 | * FUNCTION: acpi_ex_system_wait_event | |
311 | * | |
44f6c012 RM |
312 | * PARAMETERS: time_desc - The 'time to delay' object descriptor |
313 | * obj_desc - The object descriptor for this op | |
1da177e4 LT |
314 | * |
315 | * RETURN: Status | |
316 | * | |
317 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
318 | * within the AML. This operation is a request to wait for an | |
319 | * event. | |
320 | * | |
321 | ******************************************************************************/ | |
322 | ||
323 | acpi_status | |
324 | acpi_ex_system_wait_event ( | |
325 | union acpi_operand_object *time_desc, | |
326 | union acpi_operand_object *obj_desc) | |
327 | { | |
328 | acpi_status status = AE_OK; | |
329 | ||
330 | ||
331 | ACPI_FUNCTION_TRACE ("ex_system_wait_event"); | |
332 | ||
333 | ||
334 | if (obj_desc) { | |
335 | status = acpi_ex_system_wait_semaphore (obj_desc->event.semaphore, | |
44f6c012 | 336 | (u16) time_desc->integer.value); |
1da177e4 LT |
337 | } |
338 | ||
339 | return_ACPI_STATUS (status); | |
340 | } | |
341 | ||
342 | ||
343 | /******************************************************************************* | |
344 | * | |
345 | * FUNCTION: acpi_ex_system_reset_event | |
346 | * | |
44f6c012 | 347 | * PARAMETERS: obj_desc - The object descriptor for this op |
1da177e4 LT |
348 | * |
349 | * RETURN: Status | |
350 | * | |
351 | * DESCRIPTION: Reset an event to a known state. | |
352 | * | |
353 | ******************************************************************************/ | |
354 | ||
355 | acpi_status | |
356 | acpi_ex_system_reset_event ( | |
357 | union acpi_operand_object *obj_desc) | |
358 | { | |
359 | acpi_status status = AE_OK; | |
360 | void *temp_semaphore; | |
361 | ||
362 | ||
363 | ACPI_FUNCTION_ENTRY (); | |
364 | ||
365 | ||
366 | /* | |
367 | * We are going to simply delete the existing semaphore and | |
368 | * create a new one! | |
369 | */ | |
370 | status = acpi_os_create_semaphore (ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore); | |
371 | if (ACPI_SUCCESS (status)) { | |
372 | (void) acpi_os_delete_semaphore (obj_desc->event.semaphore); | |
373 | obj_desc->event.semaphore = temp_semaphore; | |
374 | } | |
375 | ||
376 | return (status); | |
377 | } | |
378 |