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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 | ******************************************************************************/ | |
4be44fcd | 66 | acpi_status acpi_ex_system_wait_semaphore(acpi_handle semaphore, u16 timeout) |
1da177e4 | 67 | { |
4be44fcd LB |
68 | acpi_status status; |
69 | acpi_status status2; | |
1da177e4 | 70 | |
4be44fcd | 71 | ACPI_FUNCTION_TRACE("ex_system_wait_semaphore"); |
1da177e4 | 72 | |
4be44fcd LB |
73 | status = acpi_os_wait_semaphore(semaphore, 1, 0); |
74 | if (ACPI_SUCCESS(status)) { | |
75 | return_ACPI_STATUS(status); | |
1da177e4 LT |
76 | } |
77 | ||
78 | if (status == AE_TIME) { | |
79 | /* We must wait, so unlock the interpreter */ | |
80 | ||
4be44fcd | 81 | acpi_ex_exit_interpreter(); |
1da177e4 | 82 | |
4be44fcd | 83 | status = acpi_os_wait_semaphore(semaphore, 1, timeout); |
1da177e4 | 84 | |
4be44fcd LB |
85 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
86 | "*** Thread awake after blocking, %s\n", | |
87 | acpi_format_exception(status))); | |
1da177e4 LT |
88 | |
89 | /* Reacquire the interpreter */ | |
90 | ||
4be44fcd LB |
91 | status2 = acpi_ex_enter_interpreter(); |
92 | if (ACPI_FAILURE(status2)) { | |
1da177e4 LT |
93 | /* Report fatal error, could not acquire interpreter */ |
94 | ||
4be44fcd | 95 | return_ACPI_STATUS(status2); |
1da177e4 LT |
96 | } |
97 | } | |
98 | ||
4be44fcd | 99 | return_ACPI_STATUS(status); |
1da177e4 LT |
100 | } |
101 | ||
1da177e4 LT |
102 | /******************************************************************************* |
103 | * | |
104 | * FUNCTION: acpi_ex_system_do_stall | |
105 | * | |
44f6c012 RM |
106 | * PARAMETERS: how_long - The amount of time to stall, |
107 | * in microseconds | |
1da177e4 LT |
108 | * |
109 | * RETURN: Status | |
110 | * | |
111 | * DESCRIPTION: Suspend running thread for specified amount of time. | |
112 | * Note: ACPI specification requires that Stall() does not | |
113 | * relinquish the processor, and delays longer than 100 usec | |
114 | * should use Sleep() instead. We allow stalls up to 255 usec | |
115 | * for compatibility with other interpreters and existing BIOSs. | |
116 | * | |
117 | ******************************************************************************/ | |
118 | ||
4be44fcd | 119 | acpi_status acpi_ex_system_do_stall(u32 how_long) |
1da177e4 | 120 | { |
4be44fcd | 121 | acpi_status status = AE_OK; |
1da177e4 | 122 | |
4be44fcd | 123 | ACPI_FUNCTION_ENTRY(); |
1da177e4 | 124 | |
4be44fcd | 125 | if (how_long > 255) { /* 255 microseconds */ |
1da177e4 LT |
126 | /* |
127 | * Longer than 255 usec, this is an error | |
128 | * | |
129 | * (ACPI specifies 100 usec as max, but this gives some slack in | |
130 | * order to support existing BIOSs) | |
131 | */ | |
b8e4d893 BM |
132 | ACPI_ERROR((AE_INFO, "Time parameter is too large (%d)", |
133 | how_long)); | |
1da177e4 | 134 | status = AE_AML_OPERAND_VALUE; |
4be44fcd LB |
135 | } else { |
136 | acpi_os_stall(how_long); | |
1da177e4 LT |
137 | } |
138 | ||
139 | return (status); | |
140 | } | |
141 | ||
1da177e4 LT |
142 | /******************************************************************************* |
143 | * | |
144 | * FUNCTION: acpi_ex_system_do_suspend | |
145 | * | |
44f6c012 RM |
146 | * PARAMETERS: how_long - The amount of time to suspend, |
147 | * in milliseconds | |
1da177e4 LT |
148 | * |
149 | * RETURN: None | |
150 | * | |
151 | * DESCRIPTION: Suspend running thread for specified amount of time. | |
152 | * | |
153 | ******************************************************************************/ | |
154 | ||
4be44fcd | 155 | acpi_status acpi_ex_system_do_suspend(acpi_integer how_long) |
1da177e4 | 156 | { |
4be44fcd | 157 | acpi_status status; |
1da177e4 | 158 | |
4be44fcd | 159 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
160 | |
161 | /* Since this thread will sleep, we must release the interpreter */ | |
162 | ||
4be44fcd | 163 | acpi_ex_exit_interpreter(); |
1da177e4 | 164 | |
4be44fcd | 165 | acpi_os_sleep(how_long); |
1da177e4 LT |
166 | |
167 | /* And now we must get the interpreter again */ | |
168 | ||
4be44fcd | 169 | status = acpi_ex_enter_interpreter(); |
1da177e4 LT |
170 | return (status); |
171 | } | |
172 | ||
1da177e4 LT |
173 | /******************************************************************************* |
174 | * | |
175 | * FUNCTION: acpi_ex_system_acquire_mutex | |
176 | * | |
44f6c012 RM |
177 | * PARAMETERS: time_desc - The 'time to delay' object descriptor |
178 | * obj_desc - The object descriptor for this op | |
1da177e4 LT |
179 | * |
180 | * RETURN: Status | |
181 | * | |
182 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
183 | * within the AML. This function will cause a lock to be generated | |
184 | * for the Mutex pointed to by obj_desc. | |
185 | * | |
186 | ******************************************************************************/ | |
187 | ||
188 | acpi_status | |
4be44fcd LB |
189 | acpi_ex_system_acquire_mutex(union acpi_operand_object * time_desc, |
190 | union acpi_operand_object * obj_desc) | |
1da177e4 | 191 | { |
4be44fcd | 192 | acpi_status status = AE_OK; |
1da177e4 | 193 | |
4be44fcd | 194 | ACPI_FUNCTION_TRACE_PTR("ex_system_acquire_mutex", obj_desc); |
1da177e4 LT |
195 | |
196 | if (!obj_desc) { | |
4be44fcd | 197 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
198 | } |
199 | ||
44f6c012 RM |
200 | /* Support for the _GL_ Mutex object -- go get the global lock */ |
201 | ||
1da177e4 | 202 | if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) { |
4be44fcd LB |
203 | status = |
204 | acpi_ev_acquire_global_lock((u16) time_desc->integer.value); | |
205 | return_ACPI_STATUS(status); | |
1da177e4 LT |
206 | } |
207 | ||
4be44fcd LB |
208 | status = acpi_ex_system_wait_semaphore(obj_desc->mutex.semaphore, |
209 | (u16) time_desc->integer.value); | |
210 | return_ACPI_STATUS(status); | |
1da177e4 LT |
211 | } |
212 | ||
1da177e4 LT |
213 | /******************************************************************************* |
214 | * | |
215 | * FUNCTION: acpi_ex_system_release_mutex | |
216 | * | |
44f6c012 | 217 | * PARAMETERS: obj_desc - The object descriptor for this op |
1da177e4 LT |
218 | * |
219 | * RETURN: Status | |
220 | * | |
221 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
222 | * within the AML. This operation is a request to release a | |
223 | * previously acquired Mutex. If the Mutex variable is set then | |
224 | * it will be decremented. | |
225 | * | |
226 | ******************************************************************************/ | |
227 | ||
4be44fcd | 228 | acpi_status acpi_ex_system_release_mutex(union acpi_operand_object *obj_desc) |
1da177e4 | 229 | { |
4be44fcd | 230 | acpi_status status = AE_OK; |
1da177e4 | 231 | |
4be44fcd | 232 | ACPI_FUNCTION_TRACE("ex_system_release_mutex"); |
1da177e4 LT |
233 | |
234 | if (!obj_desc) { | |
4be44fcd | 235 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
236 | } |
237 | ||
44f6c012 RM |
238 | /* Support for the _GL_ Mutex object -- release the global lock */ |
239 | ||
1da177e4 | 240 | if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) { |
4be44fcd LB |
241 | status = acpi_ev_release_global_lock(); |
242 | return_ACPI_STATUS(status); | |
1da177e4 LT |
243 | } |
244 | ||
4be44fcd LB |
245 | status = acpi_os_signal_semaphore(obj_desc->mutex.semaphore, 1); |
246 | return_ACPI_STATUS(status); | |
1da177e4 LT |
247 | } |
248 | ||
1da177e4 LT |
249 | /******************************************************************************* |
250 | * | |
251 | * FUNCTION: acpi_ex_system_signal_event | |
252 | * | |
44f6c012 | 253 | * PARAMETERS: obj_desc - The object descriptor for this op |
1da177e4 | 254 | * |
44f6c012 | 255 | * RETURN: Status |
1da177e4 LT |
256 | * |
257 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
258 | * within the AML. | |
259 | * | |
260 | ******************************************************************************/ | |
261 | ||
4be44fcd | 262 | acpi_status acpi_ex_system_signal_event(union acpi_operand_object *obj_desc) |
1da177e4 | 263 | { |
4be44fcd | 264 | acpi_status status = AE_OK; |
1da177e4 | 265 | |
4be44fcd | 266 | ACPI_FUNCTION_TRACE("ex_system_signal_event"); |
1da177e4 LT |
267 | |
268 | if (obj_desc) { | |
4be44fcd | 269 | status = acpi_os_signal_semaphore(obj_desc->event.semaphore, 1); |
1da177e4 LT |
270 | } |
271 | ||
4be44fcd | 272 | return_ACPI_STATUS(status); |
1da177e4 LT |
273 | } |
274 | ||
1da177e4 LT |
275 | /******************************************************************************* |
276 | * | |
277 | * FUNCTION: acpi_ex_system_wait_event | |
278 | * | |
44f6c012 RM |
279 | * PARAMETERS: time_desc - The 'time to delay' object descriptor |
280 | * obj_desc - The object descriptor for this op | |
1da177e4 LT |
281 | * |
282 | * RETURN: Status | |
283 | * | |
284 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
285 | * within the AML. This operation is a request to wait for an | |
286 | * event. | |
287 | * | |
288 | ******************************************************************************/ | |
289 | ||
290 | acpi_status | |
4be44fcd LB |
291 | acpi_ex_system_wait_event(union acpi_operand_object *time_desc, |
292 | union acpi_operand_object *obj_desc) | |
1da177e4 | 293 | { |
4be44fcd | 294 | acpi_status status = AE_OK; |
1da177e4 | 295 | |
4be44fcd | 296 | ACPI_FUNCTION_TRACE("ex_system_wait_event"); |
1da177e4 LT |
297 | |
298 | if (obj_desc) { | |
4be44fcd LB |
299 | status = |
300 | acpi_ex_system_wait_semaphore(obj_desc->event.semaphore, | |
301 | (u16) time_desc->integer. | |
302 | value); | |
1da177e4 LT |
303 | } |
304 | ||
4be44fcd | 305 | return_ACPI_STATUS(status); |
1da177e4 LT |
306 | } |
307 | ||
1da177e4 LT |
308 | /******************************************************************************* |
309 | * | |
310 | * FUNCTION: acpi_ex_system_reset_event | |
311 | * | |
44f6c012 | 312 | * PARAMETERS: obj_desc - The object descriptor for this op |
1da177e4 LT |
313 | * |
314 | * RETURN: Status | |
315 | * | |
316 | * DESCRIPTION: Reset an event to a known state. | |
317 | * | |
318 | ******************************************************************************/ | |
319 | ||
4be44fcd | 320 | acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc) |
1da177e4 | 321 | { |
4be44fcd LB |
322 | acpi_status status = AE_OK; |
323 | void *temp_semaphore; | |
1da177e4 | 324 | |
4be44fcd | 325 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
326 | |
327 | /* | |
328 | * We are going to simply delete the existing semaphore and | |
329 | * create a new one! | |
330 | */ | |
4be44fcd LB |
331 | status = |
332 | acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore); | |
333 | if (ACPI_SUCCESS(status)) { | |
334 | (void)acpi_os_delete_semaphore(obj_desc->event.semaphore); | |
1da177e4 LT |
335 | obj_desc->event.semaphore = temp_semaphore; |
336 | } | |
337 | ||
338 | return (status); | |
339 | } |