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1da177e4 LT |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: exsystem - Interface to OS services | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
75a44ce0 | 9 | * Copyright (C) 2000 - 2008, Intel Corp. |
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 | 45 | #include <acpi/acpi.h> |
50df4d8b | 46 | #include <acpi/accommon.h> |
1da177e4 | 47 | #include <acpi/acinterp.h> |
1da177e4 LT |
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 | |
f6dd9221 | 63 | * interpreter is released before waiting. |
1da177e4 LT |
64 | * |
65 | ******************************************************************************/ | |
967440e3 | 66 | acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout) |
1da177e4 | 67 | { |
4be44fcd | 68 | acpi_status status; |
1da177e4 | 69 | |
b229cf92 | 70 | ACPI_FUNCTION_TRACE(ex_system_wait_semaphore); |
1da177e4 | 71 | |
967440e3 | 72 | status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT); |
4be44fcd LB |
73 | if (ACPI_SUCCESS(status)) { |
74 | return_ACPI_STATUS(status); | |
1da177e4 LT |
75 | } |
76 | ||
77 | if (status == AE_TIME) { | |
52fc0b02 | 78 | |
1da177e4 LT |
79 | /* We must wait, so unlock the interpreter */ |
80 | ||
4d2acd9e | 81 | acpi_ex_relinquish_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 | ||
4d2acd9e | 91 | acpi_ex_reacquire_interpreter(); |
1da177e4 LT |
92 | } |
93 | ||
4be44fcd | 94 | return_ACPI_STATUS(status); |
1da177e4 LT |
95 | } |
96 | ||
967440e3 BM |
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 | * | |
f6dd9221 BM |
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. | |
967440e3 BM |
109 | * |
110 | ******************************************************************************/ | |
111 | ||
112 | acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout) | |
113 | { | |
114 | acpi_status status; | |
967440e3 BM |
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 | ||
4d2acd9e | 127 | acpi_ex_relinquish_interpreter(); |
967440e3 BM |
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 | ||
4d2acd9e | 137 | acpi_ex_reacquire_interpreter(); |
967440e3 BM |
138 | } |
139 | ||
140 | return_ACPI_STATUS(status); | |
141 | } | |
142 | ||
1da177e4 LT |
143 | /******************************************************************************* |
144 | * | |
145 | * FUNCTION: acpi_ex_system_do_stall | |
146 | * | |
44f6c012 RM |
147 | * PARAMETERS: how_long - The amount of time to stall, |
148 | * in microseconds | |
1da177e4 LT |
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 | ||
4be44fcd | 160 | acpi_status acpi_ex_system_do_stall(u32 how_long) |
1da177e4 | 161 | { |
4be44fcd | 162 | acpi_status status = AE_OK; |
1da177e4 | 163 | |
4be44fcd | 164 | ACPI_FUNCTION_ENTRY(); |
1da177e4 | 165 | |
4be44fcd | 166 | if (how_long > 255) { /* 255 microseconds */ |
1da177e4 LT |
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 | */ | |
b8e4d893 BM |
173 | ACPI_ERROR((AE_INFO, "Time parameter is too large (%d)", |
174 | how_long)); | |
1da177e4 | 175 | status = AE_AML_OPERAND_VALUE; |
4be44fcd LB |
176 | } else { |
177 | acpi_os_stall(how_long); | |
1da177e4 LT |
178 | } |
179 | ||
180 | return (status); | |
181 | } | |
182 | ||
1da177e4 LT |
183 | /******************************************************************************* |
184 | * | |
185 | * FUNCTION: acpi_ex_system_do_suspend | |
186 | * | |
44f6c012 RM |
187 | * PARAMETERS: how_long - The amount of time to suspend, |
188 | * in milliseconds | |
1da177e4 LT |
189 | * |
190 | * RETURN: None | |
191 | * | |
192 | * DESCRIPTION: Suspend running thread for specified amount of time. | |
193 | * | |
194 | ******************************************************************************/ | |
195 | ||
4be44fcd | 196 | acpi_status acpi_ex_system_do_suspend(acpi_integer how_long) |
1da177e4 | 197 | { |
4be44fcd | 198 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
199 | |
200 | /* Since this thread will sleep, we must release the interpreter */ | |
201 | ||
4d2acd9e | 202 | acpi_ex_relinquish_interpreter(); |
1da177e4 | 203 | |
4be44fcd | 204 | acpi_os_sleep(how_long); |
1da177e4 LT |
205 | |
206 | /* And now we must get the interpreter again */ | |
207 | ||
4d2acd9e LB |
208 | acpi_ex_reacquire_interpreter(); |
209 | return (AE_OK); | |
1da177e4 LT |
210 | } |
211 | ||
1da177e4 LT |
212 | /******************************************************************************* |
213 | * | |
214 | * FUNCTION: acpi_ex_system_signal_event | |
215 | * | |
44f6c012 | 216 | * PARAMETERS: obj_desc - The object descriptor for this op |
1da177e4 | 217 | * |
44f6c012 | 218 | * RETURN: Status |
1da177e4 LT |
219 | * |
220 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
221 | * within the AML. | |
222 | * | |
223 | ******************************************************************************/ | |
224 | ||
c81da666 | 225 | acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc) |
1da177e4 | 226 | { |
4be44fcd | 227 | acpi_status status = AE_OK; |
1da177e4 | 228 | |
b229cf92 | 229 | ACPI_FUNCTION_TRACE(ex_system_signal_event); |
1da177e4 LT |
230 | |
231 | if (obj_desc) { | |
967440e3 BM |
232 | status = |
233 | acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1); | |
1da177e4 LT |
234 | } |
235 | ||
4be44fcd | 236 | return_ACPI_STATUS(status); |
1da177e4 LT |
237 | } |
238 | ||
1da177e4 LT |
239 | /******************************************************************************* |
240 | * | |
241 | * FUNCTION: acpi_ex_system_wait_event | |
242 | * | |
44f6c012 RM |
243 | * PARAMETERS: time_desc - The 'time to delay' object descriptor |
244 | * obj_desc - The object descriptor for this op | |
1da177e4 LT |
245 | * |
246 | * RETURN: Status | |
247 | * | |
248 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
249 | * within the AML. This operation is a request to wait for an | |
250 | * event. | |
251 | * | |
252 | ******************************************************************************/ | |
253 | ||
254 | acpi_status | |
4be44fcd LB |
255 | acpi_ex_system_wait_event(union acpi_operand_object *time_desc, |
256 | union acpi_operand_object *obj_desc) | |
1da177e4 | 257 | { |
4be44fcd | 258 | acpi_status status = AE_OK; |
1da177e4 | 259 | |
b229cf92 | 260 | ACPI_FUNCTION_TRACE(ex_system_wait_event); |
1da177e4 LT |
261 | |
262 | if (obj_desc) { | |
4be44fcd | 263 | status = |
967440e3 | 264 | acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore, |
4be44fcd LB |
265 | (u16) time_desc->integer. |
266 | value); | |
1da177e4 LT |
267 | } |
268 | ||
4be44fcd | 269 | return_ACPI_STATUS(status); |
1da177e4 LT |
270 | } |
271 | ||
1da177e4 LT |
272 | /******************************************************************************* |
273 | * | |
274 | * FUNCTION: acpi_ex_system_reset_event | |
275 | * | |
44f6c012 | 276 | * PARAMETERS: obj_desc - The object descriptor for this op |
1da177e4 LT |
277 | * |
278 | * RETURN: Status | |
279 | * | |
280 | * DESCRIPTION: Reset an event to a known state. | |
281 | * | |
282 | ******************************************************************************/ | |
283 | ||
4be44fcd | 284 | acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc) |
1da177e4 | 285 | { |
4be44fcd | 286 | acpi_status status = AE_OK; |
967440e3 | 287 | acpi_semaphore temp_semaphore; |
1da177e4 | 288 | |
4be44fcd | 289 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
290 | |
291 | /* | |
292 | * We are going to simply delete the existing semaphore and | |
293 | * create a new one! | |
294 | */ | |
4be44fcd LB |
295 | status = |
296 | acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore); | |
297 | if (ACPI_SUCCESS(status)) { | |
967440e3 BM |
298 | (void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore); |
299 | obj_desc->event.os_semaphore = temp_semaphore; | |
1da177e4 LT |
300 | } |
301 | ||
302 | return (status); | |
303 | } |