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1
2/******************************************************************************
3 *
4 * Module Name: exsystem - Interface to OS services
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2011, Intel Corp.
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#include <acpi/acpi.h>
46#include "accommon.h"
47#include "acinterp.h"
48
49#define _COMPONENT ACPI_EXECUTER
50ACPI_MODULE_NAME("exsystem")
51
52/*******************************************************************************
53 *
54 * FUNCTION: acpi_ex_system_wait_semaphore
55 *
56 * PARAMETERS: Semaphore - Semaphore to wait on
57 * Timeout - Max time to wait
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 before waiting.
64 *
65 ******************************************************************************/
66acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
67{
68 acpi_status status;
69
70 ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
71
72 status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT);
73 if (ACPI_SUCCESS(status)) {
74 return_ACPI_STATUS(status);
75 }
76
77 if (status == AE_TIME) {
78
79 /* We must wait, so unlock the interpreter */
80
81 acpi_ex_relinquish_interpreter();
82
83 status = acpi_os_wait_semaphore(semaphore, 1, timeout);
84
85 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
86 "*** Thread awake after blocking, %s\n",
87 acpi_format_exception(status)));
88
89 /* Reacquire the interpreter */
90
91 acpi_ex_reacquire_interpreter();
92 }
93
94 return_ACPI_STATUS(status);
95}
96
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 *
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.
109 *
110 ******************************************************************************/
111
112acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
113{
114 acpi_status status;
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
127 acpi_ex_relinquish_interpreter();
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
137 acpi_ex_reacquire_interpreter();
138 }
139
140 return_ACPI_STATUS(status);
141}
142
143/*******************************************************************************
144 *
145 * FUNCTION: acpi_ex_system_do_stall
146 *
147 * PARAMETERS: how_long - The amount of time to stall,
148 * in microseconds
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
160acpi_status acpi_ex_system_do_stall(u32 how_long)
161{
162 acpi_status status = AE_OK;
163
164 ACPI_FUNCTION_ENTRY();
165
166 if (how_long > 255) { /* 255 microseconds */
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 */
173 ACPI_ERROR((AE_INFO, "Time parameter is too large (%u)",
174 how_long));
175 status = AE_AML_OPERAND_VALUE;
176 } else {
177 acpi_os_stall(how_long);
178 }
179
180 return (status);
181}
182
183/*******************************************************************************
184 *
185 * FUNCTION: acpi_ex_system_do_sleep
186 *
187 * PARAMETERS: how_long - The amount of time to sleep,
188 * in milliseconds
189 *
190 * RETURN: None
191 *
192 * DESCRIPTION: Sleep the running thread for specified amount of time.
193 *
194 ******************************************************************************/
195
196acpi_status acpi_ex_system_do_sleep(u64 how_long)
197{
198 ACPI_FUNCTION_ENTRY();
199
200 /* Since this thread will sleep, we must release the interpreter */
201
202 acpi_ex_relinquish_interpreter();
203
204 /*
205 * For compatibility with other ACPI implementations and to prevent
206 * accidental deep sleeps, limit the sleep time to something reasonable.
207 */
208 if (how_long > ACPI_MAX_SLEEP) {
209 how_long = ACPI_MAX_SLEEP;
210 }
211
212 acpi_os_sleep(how_long);
213
214 /* And now we must get the interpreter again */
215
216 acpi_ex_reacquire_interpreter();
217 return (AE_OK);
218}
219
220/*******************************************************************************
221 *
222 * FUNCTION: acpi_ex_system_signal_event
223 *
224 * PARAMETERS: obj_desc - The object descriptor for this op
225 *
226 * RETURN: Status
227 *
228 * DESCRIPTION: Provides an access point to perform synchronization operations
229 * within the AML.
230 *
231 ******************************************************************************/
232
233acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)
234{
235 acpi_status status = AE_OK;
236
237 ACPI_FUNCTION_TRACE(ex_system_signal_event);
238
239 if (obj_desc) {
240 status =
241 acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1);
242 }
243
244 return_ACPI_STATUS(status);
245}
246
247/*******************************************************************************
248 *
249 * FUNCTION: acpi_ex_system_wait_event
250 *
251 * PARAMETERS: time_desc - The 'time to delay' object descriptor
252 * obj_desc - The object descriptor for this op
253 *
254 * RETURN: Status
255 *
256 * DESCRIPTION: Provides an access point to perform synchronization operations
257 * within the AML. This operation is a request to wait for an
258 * event.
259 *
260 ******************************************************************************/
261
262acpi_status
263acpi_ex_system_wait_event(union acpi_operand_object *time_desc,
264 union acpi_operand_object *obj_desc)
265{
266 acpi_status status = AE_OK;
267
268 ACPI_FUNCTION_TRACE(ex_system_wait_event);
269
270 if (obj_desc) {
271 status =
272 acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore,
273 (u16) time_desc->integer.
274 value);
275 }
276
277 return_ACPI_STATUS(status);
278}
279
280/*******************************************************************************
281 *
282 * FUNCTION: acpi_ex_system_reset_event
283 *
284 * PARAMETERS: obj_desc - The object descriptor for this op
285 *
286 * RETURN: Status
287 *
288 * DESCRIPTION: Reset an event to a known state.
289 *
290 ******************************************************************************/
291
292acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
293{
294 acpi_status status = AE_OK;
295 acpi_semaphore temp_semaphore;
296
297 ACPI_FUNCTION_ENTRY();
298
299 /*
300 * We are going to simply delete the existing semaphore and
301 * create a new one!
302 */
303 status =
304 acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
305 if (ACPI_SUCCESS(status)) {
306 (void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore);
307 obj_desc->event.os_semaphore = temp_semaphore;
308 }
309
310 return (status);
311}
1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: exsystem - Interface to OS services
5 *
6 * Copyright (C) 2000 - 2019, Intel Corp.
7 *
8 *****************************************************************************/
9
10#include <acpi/acpi.h>
11#include "accommon.h"
12#include "acinterp.h"
13
14#define _COMPONENT ACPI_EXECUTER
15ACPI_MODULE_NAME("exsystem")
16
17/*******************************************************************************
18 *
19 * FUNCTION: acpi_ex_system_wait_semaphore
20 *
21 * PARAMETERS: semaphore - Semaphore to wait on
22 * timeout - Max time to wait
23 *
24 * RETURN: Status
25 *
26 * DESCRIPTION: Implements a semaphore wait with a check to see if the
27 * semaphore is available immediately. If it is not, the
28 * interpreter is released before waiting.
29 *
30 ******************************************************************************/
31acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
32{
33 acpi_status status;
34
35 ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
36
37 status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT);
38 if (ACPI_SUCCESS(status)) {
39 return_ACPI_STATUS(status);
40 }
41
42 if (status == AE_TIME) {
43
44 /* We must wait, so unlock the interpreter */
45
46 acpi_ex_exit_interpreter();
47 status = acpi_os_wait_semaphore(semaphore, 1, timeout);
48
49 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
50 "*** Thread awake after blocking, %s\n",
51 acpi_format_exception(status)));
52
53 /* Reacquire the interpreter */
54
55 acpi_ex_enter_interpreter();
56 }
57
58 return_ACPI_STATUS(status);
59}
60
61/*******************************************************************************
62 *
63 * FUNCTION: acpi_ex_system_wait_mutex
64 *
65 * PARAMETERS: mutex - Mutex to wait on
66 * timeout - Max time to wait
67 *
68 * RETURN: Status
69 *
70 * DESCRIPTION: Implements a mutex wait with a check to see if the
71 * mutex is available immediately. If it is not, the
72 * interpreter is released before waiting.
73 *
74 ******************************************************************************/
75
76acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
77{
78 acpi_status status;
79
80 ACPI_FUNCTION_TRACE(ex_system_wait_mutex);
81
82 status = acpi_os_acquire_mutex(mutex, ACPI_DO_NOT_WAIT);
83 if (ACPI_SUCCESS(status)) {
84 return_ACPI_STATUS(status);
85 }
86
87 if (status == AE_TIME) {
88
89 /* We must wait, so unlock the interpreter */
90
91 acpi_ex_exit_interpreter();
92 status = acpi_os_acquire_mutex(mutex, timeout);
93
94 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
95 "*** Thread awake after blocking, %s\n",
96 acpi_format_exception(status)));
97
98 /* Reacquire the interpreter */
99
100 acpi_ex_enter_interpreter();
101 }
102
103 return_ACPI_STATUS(status);
104}
105
106/*******************************************************************************
107 *
108 * FUNCTION: acpi_ex_system_do_stall
109 *
110 * PARAMETERS: how_long - The amount of time to stall,
111 * in microseconds
112 *
113 * RETURN: Status
114 *
115 * DESCRIPTION: Suspend running thread for specified amount of time.
116 * Note: ACPI specification requires that Stall() does not
117 * relinquish the processor, and delays longer than 100 usec
118 * should use Sleep() instead. We allow stalls up to 255 usec
119 * for compatibility with other interpreters and existing BIOSs.
120 *
121 ******************************************************************************/
122
123acpi_status acpi_ex_system_do_stall(u32 how_long)
124{
125 acpi_status status = AE_OK;
126
127 ACPI_FUNCTION_ENTRY();
128
129 if (how_long > 255) { /* 255 microseconds */
130 /*
131 * Longer than 255 usec, this is an error
132 *
133 * (ACPI specifies 100 usec as max, but this gives some slack in
134 * order to support existing BIOSs)
135 */
136 ACPI_ERROR((AE_INFO,
137 "Time parameter is too large (%u)", how_long));
138 status = AE_AML_OPERAND_VALUE;
139 } else {
140 acpi_os_stall(how_long);
141 }
142
143 return (status);
144}
145
146/*******************************************************************************
147 *
148 * FUNCTION: acpi_ex_system_do_sleep
149 *
150 * PARAMETERS: how_long - The amount of time to sleep,
151 * in milliseconds
152 *
153 * RETURN: None
154 *
155 * DESCRIPTION: Sleep the running thread for specified amount of time.
156 *
157 ******************************************************************************/
158
159acpi_status acpi_ex_system_do_sleep(u64 how_long)
160{
161 ACPI_FUNCTION_ENTRY();
162
163 /* Since this thread will sleep, we must release the interpreter */
164
165 acpi_ex_exit_interpreter();
166
167 /*
168 * For compatibility with other ACPI implementations and to prevent
169 * accidental deep sleeps, limit the sleep time to something reasonable.
170 */
171 if (how_long > ACPI_MAX_SLEEP) {
172 how_long = ACPI_MAX_SLEEP;
173 }
174
175 acpi_os_sleep(how_long);
176
177 /* And now we must get the interpreter again */
178
179 acpi_ex_enter_interpreter();
180 return (AE_OK);
181}
182
183/*******************************************************************************
184 *
185 * FUNCTION: acpi_ex_system_signal_event
186 *
187 * PARAMETERS: obj_desc - The object descriptor for this op
188 *
189 * RETURN: Status
190 *
191 * DESCRIPTION: Provides an access point to perform synchronization operations
192 * within the AML.
193 *
194 ******************************************************************************/
195
196acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)
197{
198 acpi_status status = AE_OK;
199
200 ACPI_FUNCTION_TRACE(ex_system_signal_event);
201
202 if (obj_desc) {
203 status =
204 acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1);
205 }
206
207 return_ACPI_STATUS(status);
208}
209
210/*******************************************************************************
211 *
212 * FUNCTION: acpi_ex_system_wait_event
213 *
214 * PARAMETERS: time_desc - The 'time to delay' object descriptor
215 * obj_desc - The object descriptor for this op
216 *
217 * RETURN: Status
218 *
219 * DESCRIPTION: Provides an access point to perform synchronization operations
220 * within the AML. This operation is a request to wait for an
221 * event.
222 *
223 ******************************************************************************/
224
225acpi_status
226acpi_ex_system_wait_event(union acpi_operand_object *time_desc,
227 union acpi_operand_object *obj_desc)
228{
229 acpi_status status = AE_OK;
230
231 ACPI_FUNCTION_TRACE(ex_system_wait_event);
232
233 if (obj_desc) {
234 status =
235 acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore,
236 (u16) time_desc->integer.
237 value);
238 }
239
240 return_ACPI_STATUS(status);
241}
242
243/*******************************************************************************
244 *
245 * FUNCTION: acpi_ex_system_reset_event
246 *
247 * PARAMETERS: obj_desc - The object descriptor for this op
248 *
249 * RETURN: Status
250 *
251 * DESCRIPTION: Reset an event to a known state.
252 *
253 ******************************************************************************/
254
255acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
256{
257 acpi_status status = AE_OK;
258 acpi_semaphore temp_semaphore;
259
260 ACPI_FUNCTION_ENTRY();
261
262 /*
263 * We are going to simply delete the existing semaphore and
264 * create a new one!
265 */
266 status =
267 acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
268 if (ACPI_SUCCESS(status)) {
269 (void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore);
270 obj_desc->event.os_semaphore = temp_semaphore;
271 }
272
273 return (status);
274}