1 /******************************************************************************
2 *
3 * Module Name: exsystem - Interface to OS services
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2016, Intel Corp.
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
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acinterp.h"
47
48 #define _COMPONENT ACPI_EXECUTER
49 ACPI_MODULE_NAME("exsystem")
50
51 /*******************************************************************************
52 *
53 * FUNCTION: acpi_ex_system_wait_semaphore
54 *
55 * PARAMETERS: semaphore - Semaphore to wait on
56 * timeout - Max time to wait
57 *
58 * RETURN: Status
59 *
60 * DESCRIPTION: Implements a semaphore wait with a check to see if the
61 * semaphore is available immediately. If it is not, the
62 * interpreter is released before waiting.
63 *
64 ******************************************************************************/
acpi_ex_system_wait_semaphore(acpi_semaphore semaphore,u16 timeout)65 acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
66 {
67 acpi_status status;
68
69 ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
70
71 status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT);
72 if (ACPI_SUCCESS(status)) {
73 return_ACPI_STATUS(status);
74 }
75
76 if (status == AE_TIME) {
77
78 /* We must wait, so unlock the interpreter */
79
80 acpi_ex_exit_interpreter();
81 status = acpi_os_wait_semaphore(semaphore, 1, timeout);
82
83 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
84 "*** Thread awake after blocking, %s\n",
85 acpi_format_exception(status)));
86
87 /* Reacquire the interpreter */
88
89 acpi_ex_enter_interpreter();
90 }
91
92 return_ACPI_STATUS(status);
93 }
94
95 /*******************************************************************************
96 *
97 * FUNCTION: acpi_ex_system_wait_mutex
98 *
99 * PARAMETERS: mutex - Mutex to wait on
100 * timeout - Max time to wait
101 *
102 * RETURN: Status
103 *
104 * DESCRIPTION: Implements a mutex wait with a check to see if the
105 * mutex is available immediately. If it is not, the
106 * interpreter is released before waiting.
107 *
108 ******************************************************************************/
109
acpi_ex_system_wait_mutex(acpi_mutex mutex,u16 timeout)110 acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
111 {
112 acpi_status status;
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
125 acpi_ex_exit_interpreter();
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
134 acpi_ex_enter_interpreter();
135 }
136
137 return_ACPI_STATUS(status);
138 }
139
140 /*******************************************************************************
141 *
142 * FUNCTION: acpi_ex_system_do_stall
143 *
144 * PARAMETERS: how_long - The amount of time to stall,
145 * in microseconds
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
152 * should use Sleep() instead. We allow stalls up to 255 usec
153 * for compatibility with other interpreters and existing BIOSs.
154 *
155 ******************************************************************************/
156
acpi_ex_system_do_stall(u32 how_long)157 acpi_status acpi_ex_system_do_stall(u32 how_long)
158 {
159 acpi_status status = AE_OK;
160
161 ACPI_FUNCTION_ENTRY();
162
163 if (how_long > 255) { /* 255 microseconds */
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 */
170 ACPI_ERROR((AE_INFO,
171 "Time parameter is too large (%u)", how_long));
172 status = AE_AML_OPERAND_VALUE;
173 } else {
174 acpi_os_stall(how_long);
175 }
176
177 return (status);
178 }
179
180 /*******************************************************************************
181 *
182 * FUNCTION: acpi_ex_system_do_sleep
183 *
184 * PARAMETERS: how_long - The amount of time to sleep,
185 * in milliseconds
186 *
187 * RETURN: None
188 *
189 * DESCRIPTION: Sleep the running thread for specified amount of time.
190 *
191 ******************************************************************************/
192
acpi_ex_system_do_sleep(u64 how_long)193 acpi_status acpi_ex_system_do_sleep(u64 how_long)
194 {
195 ACPI_FUNCTION_ENTRY();
196
197 /* Since this thread will sleep, we must release the interpreter */
198
199 acpi_ex_exit_interpreter();
200
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
209 acpi_os_sleep(how_long);
210
211 /* And now we must get the interpreter again */
212
213 acpi_ex_enter_interpreter();
214 return (AE_OK);
215 }
216
217 /*******************************************************************************
218 *
219 * FUNCTION: acpi_ex_system_signal_event
220 *
221 * PARAMETERS: obj_desc - The object descriptor for this op
222 *
223 * RETURN: Status
224 *
225 * DESCRIPTION: Provides an access point to perform synchronization operations
226 * within the AML.
227 *
228 ******************************************************************************/
229
acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)230 acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)
231 {
232 acpi_status status = AE_OK;
233
234 ACPI_FUNCTION_TRACE(ex_system_signal_event);
235
236 if (obj_desc) {
237 status =
238 acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1);
239 }
240
241 return_ACPI_STATUS(status);
242 }
243
244 /*******************************************************************************
245 *
246 * FUNCTION: acpi_ex_system_wait_event
247 *
248 * PARAMETERS: time_desc - The 'time to delay' object descriptor
249 * obj_desc - The object descriptor for this op
250 *
251 * RETURN: Status
252 *
253 * DESCRIPTION: Provides an access point to perform synchronization operations
254 * within the AML. This operation is a request to wait for an
255 * event.
256 *
257 ******************************************************************************/
258
259 acpi_status
acpi_ex_system_wait_event(union acpi_operand_object * time_desc,union acpi_operand_object * obj_desc)260 acpi_ex_system_wait_event(union acpi_operand_object *time_desc,
261 union acpi_operand_object *obj_desc)
262 {
263 acpi_status status = AE_OK;
264
265 ACPI_FUNCTION_TRACE(ex_system_wait_event);
266
267 if (obj_desc) {
268 status =
269 acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore,
270 (u16) time_desc->integer.
271 value);
272 }
273
274 return_ACPI_STATUS(status);
275 }
276
277 /*******************************************************************************
278 *
279 * FUNCTION: acpi_ex_system_reset_event
280 *
281 * PARAMETERS: obj_desc - The object descriptor for this op
282 *
283 * RETURN: Status
284 *
285 * DESCRIPTION: Reset an event to a known state.
286 *
287 ******************************************************************************/
288
acpi_ex_system_reset_event(union acpi_operand_object * obj_desc)289 acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
290 {
291 acpi_status status = AE_OK;
292 acpi_semaphore temp_semaphore;
293
294 ACPI_FUNCTION_ENTRY();
295
296 /*
297 * We are going to simply delete the existing semaphore and
298 * create a new one!
299 */
300 status =
301 acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
302 if (ACPI_SUCCESS(status)) {
303 (void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore);
304 obj_desc->event.os_semaphore = temp_semaphore;
305 }
306
307 return (status);
308 }
309