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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: exsystem - Interface to OS services | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
c8100dc4 | 8 | * Copyright (C) 2000 - 2016, Intel Corp. |
1da177e4 LT |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
1da177e4 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "acinterp.h" | |
1da177e4 LT |
47 | |
48 | #define _COMPONENT ACPI_EXECUTER | |
4be44fcd | 49 | ACPI_MODULE_NAME("exsystem") |
1da177e4 LT |
50 | |
51 | /******************************************************************************* | |
52 | * | |
53 | * FUNCTION: acpi_ex_system_wait_semaphore | |
54 | * | |
ba494bee BM |
55 | * PARAMETERS: semaphore - Semaphore to wait on |
56 | * timeout - Max time to wait | |
1da177e4 LT |
57 | * |
58 | * RETURN: Status | |
59 | * | |
60 | * DESCRIPTION: Implements a semaphore wait with a check to see if the | |
73a3090a | 61 | * semaphore is available immediately. If it is not, the |
f6dd9221 | 62 | * interpreter is released before waiting. |
1da177e4 LT |
63 | * |
64 | ******************************************************************************/ | |
967440e3 | 65 | acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout) |
1da177e4 | 66 | { |
4be44fcd | 67 | acpi_status status; |
1da177e4 | 68 | |
b229cf92 | 69 | ACPI_FUNCTION_TRACE(ex_system_wait_semaphore); |
1da177e4 | 70 | |
967440e3 | 71 | status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT); |
4be44fcd LB |
72 | if (ACPI_SUCCESS(status)) { |
73 | return_ACPI_STATUS(status); | |
1da177e4 LT |
74 | } |
75 | ||
76 | if (status == AE_TIME) { | |
52fc0b02 | 77 | |
1da177e4 LT |
78 | /* We must wait, so unlock the interpreter */ |
79 | ||
e2b8ddcc | 80 | acpi_ex_exit_interpreter(); |
4be44fcd | 81 | status = acpi_os_wait_semaphore(semaphore, 1, timeout); |
1da177e4 | 82 | |
4be44fcd LB |
83 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
84 | "*** Thread awake after blocking, %s\n", | |
85 | acpi_format_exception(status))); | |
1da177e4 LT |
86 | |
87 | /* Reacquire the interpreter */ | |
88 | ||
e2b8ddcc | 89 | acpi_ex_enter_interpreter(); |
1da177e4 LT |
90 | } |
91 | ||
4be44fcd | 92 | return_ACPI_STATUS(status); |
1da177e4 LT |
93 | } |
94 | ||
967440e3 BM |
95 | /******************************************************************************* |
96 | * | |
97 | * FUNCTION: acpi_ex_system_wait_mutex | |
98 | * | |
ba494bee BM |
99 | * PARAMETERS: mutex - Mutex to wait on |
100 | * timeout - Max time to wait | |
967440e3 BM |
101 | * |
102 | * RETURN: Status | |
103 | * | |
f6dd9221 | 104 | * DESCRIPTION: Implements a mutex wait with a check to see if the |
73a3090a | 105 | * mutex is available immediately. If it is not, the |
f6dd9221 | 106 | * interpreter is released before waiting. |
967440e3 BM |
107 | * |
108 | ******************************************************************************/ | |
109 | ||
110 | acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout) | |
111 | { | |
112 | acpi_status status; | |
967440e3 BM |
113 | |
114 | ACPI_FUNCTION_TRACE(ex_system_wait_mutex); | |
115 | ||
116 | status = acpi_os_acquire_mutex(mutex, ACPI_DO_NOT_WAIT); | |
117 | if (ACPI_SUCCESS(status)) { | |
118 | return_ACPI_STATUS(status); | |
119 | } | |
120 | ||
121 | if (status == AE_TIME) { | |
122 | ||
123 | /* We must wait, so unlock the interpreter */ | |
124 | ||
e2b8ddcc | 125 | acpi_ex_exit_interpreter(); |
967440e3 BM |
126 | status = acpi_os_acquire_mutex(mutex, timeout); |
127 | ||
128 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, | |
129 | "*** Thread awake after blocking, %s\n", | |
130 | acpi_format_exception(status))); | |
131 | ||
132 | /* Reacquire the interpreter */ | |
133 | ||
e2b8ddcc | 134 | acpi_ex_enter_interpreter(); |
967440e3 BM |
135 | } |
136 | ||
137 | return_ACPI_STATUS(status); | |
138 | } | |
139 | ||
1da177e4 LT |
140 | /******************************************************************************* |
141 | * | |
142 | * FUNCTION: acpi_ex_system_do_stall | |
143 | * | |
44f6c012 RM |
144 | * PARAMETERS: how_long - The amount of time to stall, |
145 | * in microseconds | |
1da177e4 LT |
146 | * |
147 | * RETURN: Status | |
148 | * | |
149 | * DESCRIPTION: Suspend running thread for specified amount of time. | |
150 | * Note: ACPI specification requires that Stall() does not | |
151 | * relinquish the processor, and delays longer than 100 usec | |
73a3090a | 152 | * should use Sleep() instead. We allow stalls up to 255 usec |
1da177e4 LT |
153 | * for compatibility with other interpreters and existing BIOSs. |
154 | * | |
155 | ******************************************************************************/ | |
156 | ||
4be44fcd | 157 | acpi_status acpi_ex_system_do_stall(u32 how_long) |
1da177e4 | 158 | { |
4be44fcd | 159 | acpi_status status = AE_OK; |
1da177e4 | 160 | |
4be44fcd | 161 | ACPI_FUNCTION_ENTRY(); |
1da177e4 | 162 | |
4be44fcd | 163 | if (how_long > 255) { /* 255 microseconds */ |
1da177e4 LT |
164 | /* |
165 | * Longer than 255 usec, this is an error | |
166 | * | |
167 | * (ACPI specifies 100 usec as max, but this gives some slack in | |
168 | * order to support existing BIOSs) | |
169 | */ | |
1fad8738 BM |
170 | ACPI_ERROR((AE_INFO, |
171 | "Time parameter is too large (%u)", how_long)); | |
1da177e4 | 172 | status = AE_AML_OPERAND_VALUE; |
4be44fcd LB |
173 | } else { |
174 | acpi_os_stall(how_long); | |
1da177e4 LT |
175 | } |
176 | ||
177 | return (status); | |
178 | } | |
179 | ||
1da177e4 LT |
180 | /******************************************************************************* |
181 | * | |
ada241dc | 182 | * FUNCTION: acpi_ex_system_do_sleep |
1da177e4 | 183 | * |
ada241dc | 184 | * PARAMETERS: how_long - The amount of time to sleep, |
44f6c012 | 185 | * in milliseconds |
1da177e4 LT |
186 | * |
187 | * RETURN: None | |
188 | * | |
ada241dc | 189 | * DESCRIPTION: Sleep the running thread for specified amount of time. |
1da177e4 LT |
190 | * |
191 | ******************************************************************************/ | |
192 | ||
ada241dc | 193 | acpi_status acpi_ex_system_do_sleep(u64 how_long) |
1da177e4 | 194 | { |
4be44fcd | 195 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
196 | |
197 | /* Since this thread will sleep, we must release the interpreter */ | |
198 | ||
e2b8ddcc | 199 | acpi_ex_exit_interpreter(); |
1da177e4 | 200 | |
9cbfa18e BM |
201 | /* |
202 | * For compatibility with other ACPI implementations and to prevent | |
203 | * accidental deep sleeps, limit the sleep time to something reasonable. | |
204 | */ | |
205 | if (how_long > ACPI_MAX_SLEEP) { | |
206 | how_long = ACPI_MAX_SLEEP; | |
207 | } | |
208 | ||
4be44fcd | 209 | acpi_os_sleep(how_long); |
1da177e4 LT |
210 | |
211 | /* And now we must get the interpreter again */ | |
212 | ||
e2b8ddcc | 213 | acpi_ex_enter_interpreter(); |
4d2acd9e | 214 | return (AE_OK); |
1da177e4 LT |
215 | } |
216 | ||
1da177e4 LT |
217 | /******************************************************************************* |
218 | * | |
219 | * FUNCTION: acpi_ex_system_signal_event | |
220 | * | |
44f6c012 | 221 | * PARAMETERS: obj_desc - The object descriptor for this op |
1da177e4 | 222 | * |
44f6c012 | 223 | * RETURN: Status |
1da177e4 LT |
224 | * |
225 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
226 | * within the AML. | |
227 | * | |
228 | ******************************************************************************/ | |
229 | ||
c81da666 | 230 | acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc) |
1da177e4 | 231 | { |
4be44fcd | 232 | acpi_status status = AE_OK; |
1da177e4 | 233 | |
b229cf92 | 234 | ACPI_FUNCTION_TRACE(ex_system_signal_event); |
1da177e4 LT |
235 | |
236 | if (obj_desc) { | |
967440e3 BM |
237 | status = |
238 | acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1); | |
1da177e4 LT |
239 | } |
240 | ||
4be44fcd | 241 | return_ACPI_STATUS(status); |
1da177e4 LT |
242 | } |
243 | ||
1da177e4 LT |
244 | /******************************************************************************* |
245 | * | |
246 | * FUNCTION: acpi_ex_system_wait_event | |
247 | * | |
44f6c012 RM |
248 | * PARAMETERS: time_desc - The 'time to delay' object descriptor |
249 | * obj_desc - The object descriptor for this op | |
1da177e4 LT |
250 | * |
251 | * RETURN: Status | |
252 | * | |
253 | * DESCRIPTION: Provides an access point to perform synchronization operations | |
73a3090a | 254 | * within the AML. This operation is a request to wait for an |
1da177e4 LT |
255 | * event. |
256 | * | |
257 | ******************************************************************************/ | |
258 | ||
259 | acpi_status | |
4be44fcd LB |
260 | acpi_ex_system_wait_event(union acpi_operand_object *time_desc, |
261 | union acpi_operand_object *obj_desc) | |
1da177e4 | 262 | { |
4be44fcd | 263 | acpi_status status = AE_OK; |
1da177e4 | 264 | |
b229cf92 | 265 | ACPI_FUNCTION_TRACE(ex_system_wait_event); |
1da177e4 LT |
266 | |
267 | if (obj_desc) { | |
4be44fcd | 268 | status = |
967440e3 | 269 | acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore, |
4be44fcd LB |
270 | (u16) time_desc->integer. |
271 | value); | |
1da177e4 LT |
272 | } |
273 | ||
4be44fcd | 274 | return_ACPI_STATUS(status); |
1da177e4 LT |
275 | } |
276 | ||
1da177e4 LT |
277 | /******************************************************************************* |
278 | * | |
279 | * FUNCTION: acpi_ex_system_reset_event | |
280 | * | |
44f6c012 | 281 | * PARAMETERS: obj_desc - The object descriptor for this op |
1da177e4 LT |
282 | * |
283 | * RETURN: Status | |
284 | * | |
285 | * DESCRIPTION: Reset an event to a known state. | |
286 | * | |
287 | ******************************************************************************/ | |
288 | ||
4be44fcd | 289 | acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc) |
1da177e4 | 290 | { |
4be44fcd | 291 | acpi_status status = AE_OK; |
967440e3 | 292 | acpi_semaphore temp_semaphore; |
1da177e4 | 293 | |
4be44fcd | 294 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
295 | |
296 | /* | |
297 | * We are going to simply delete the existing semaphore and | |
298 | * create a new one! | |
299 | */ | |
4be44fcd LB |
300 | status = |
301 | acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore); | |
302 | if (ACPI_SUCCESS(status)) { | |
967440e3 BM |
303 | (void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore); |
304 | obj_desc->event.os_semaphore = temp_semaphore; | |
1da177e4 LT |
305 | } |
306 | ||
307 | return (status); | |
308 | } |