blob: 9460baff30328f4c5565e2c5d671eabfdf4f634c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001
2/******************************************************************************
3 *
4 * Module Name: exsystem - Interface to OS services
5 *
6 *****************************************************************************/
7
8/*
Bob Moore6c9deb72007-02-02 19:48:24 +03009 * Copyright (C) 2000 - 2007, R. Byron Moore
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <acpi/acpi.h>
46#include <acpi/acinterp.h>
47#include <acpi/acevents.h>
48
49#define _COMPONENT ACPI_EXECUTER
Len Brown4be44fc2005-08-05 00:44:28 -040050ACPI_MODULE_NAME("exsystem")
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52/*******************************************************************************
53 *
54 * FUNCTION: acpi_ex_system_wait_semaphore
55 *
Robert Moore44f6c012005-04-18 22:49:35 -040056 * PARAMETERS: Semaphore - Semaphore to wait on
57 * Timeout - Max time to wait
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 *
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
Bob Mooref6dd9222006-07-07 20:44:38 -040063 * interpreter is released before waiting.
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 *
65 ******************************************************************************/
Bob Moore967440e32006-06-23 17:04:00 -040066acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
Len Brown4be44fc2005-08-05 00:44:28 -040068 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Bob Mooreb229cf92006-04-21 17:15:00 -040070 ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Bob Moore967440e32006-06-23 17:04:00 -040072 status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT);
Len Brown4be44fc2005-08-05 00:44:28 -040073 if (ACPI_SUCCESS(status)) {
74 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 }
76
77 if (status == AE_TIME) {
Bob Moore52fc0b02006-10-02 00:00:00 -040078
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 /* We must wait, so unlock the interpreter */
80
Len Brown4d2acd92007-05-09 22:56:38 -040081 acpi_ex_relinquish_interpreter();
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Len Brown4be44fc2005-08-05 00:44:28 -040083 status = acpi_os_wait_semaphore(semaphore, 1, timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
Len Brown4be44fc2005-08-05 00:44:28 -040085 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
86 "*** Thread awake after blocking, %s\n",
87 acpi_format_exception(status)));
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
89 /* Reacquire the interpreter */
90
Len Brown4d2acd92007-05-09 22:56:38 -040091 acpi_ex_reacquire_interpreter();
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 }
93
Len Brown4be44fc2005-08-05 00:44:28 -040094 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095}
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097/*******************************************************************************
98 *
Bob Moore967440e32006-06-23 17:04:00 -040099 * 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 *
Bob Mooref6dd9222006-07-07 20:44:38 -0400106 * 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.
Bob Moore967440e32006-06-23 17:04:00 -0400109 *
110 ******************************************************************************/
111
112acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
113{
114 acpi_status status;
Bob Moore967440e32006-06-23 17:04:00 -0400115
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
Len Brown4d2acd92007-05-09 22:56:38 -0400127 acpi_ex_relinquish_interpreter();
Bob Moore967440e32006-06-23 17:04:00 -0400128
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
Len Brown4d2acd92007-05-09 22:56:38 -0400137 acpi_ex_reacquire_interpreter();
Bob Moore967440e32006-06-23 17:04:00 -0400138 }
139
140 return_ACPI_STATUS(status);
141}
142
143/*******************************************************************************
144 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 * FUNCTION: acpi_ex_system_do_stall
146 *
Robert Moore44f6c012005-04-18 22:49:35 -0400147 * PARAMETERS: how_long - The amount of time to stall,
148 * in microseconds
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 *
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
Len Brown4be44fc2005-08-05 00:44:28 -0400160acpi_status acpi_ex_system_do_stall(u32 how_long)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
Len Brown4be44fc2005-08-05 00:44:28 -0400162 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Len Brown4be44fc2005-08-05 00:44:28 -0400164 ACPI_FUNCTION_ENTRY();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Len Brown4be44fc2005-08-05 00:44:28 -0400166 if (how_long > 255) { /* 255 microseconds */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 /*
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 */
Bob Mooreb8e4d892006-01-27 16:43:00 -0500173 ACPI_ERROR((AE_INFO, "Time parameter is too large (%d)",
174 how_long));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 status = AE_AML_OPERAND_VALUE;
Len Brown4be44fc2005-08-05 00:44:28 -0400176 } else {
177 acpi_os_stall(how_long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 }
179
180 return (status);
181}
182
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183/*******************************************************************************
184 *
185 * FUNCTION: acpi_ex_system_do_suspend
186 *
Robert Moore44f6c012005-04-18 22:49:35 -0400187 * PARAMETERS: how_long - The amount of time to suspend,
188 * in milliseconds
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 *
190 * RETURN: None
191 *
192 * DESCRIPTION: Suspend running thread for specified amount of time.
193 *
194 ******************************************************************************/
195
Len Brown4be44fc2005-08-05 00:44:28 -0400196acpi_status acpi_ex_system_do_suspend(acpi_integer how_long)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
Len Brown4be44fc2005-08-05 00:44:28 -0400198 ACPI_FUNCTION_ENTRY();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200 /* Since this thread will sleep, we must release the interpreter */
201
Len Brown4d2acd92007-05-09 22:56:38 -0400202 acpi_ex_relinquish_interpreter();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Len Brown4be44fc2005-08-05 00:44:28 -0400204 acpi_os_sleep(how_long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206 /* And now we must get the interpreter again */
207
Len Brown4d2acd92007-05-09 22:56:38 -0400208 acpi_ex_reacquire_interpreter();
209 return (AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210}
211
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212/*******************************************************************************
213 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 * FUNCTION: acpi_ex_system_signal_event
215 *
Robert Moore44f6c012005-04-18 22:49:35 -0400216 * PARAMETERS: obj_desc - The object descriptor for this op
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 *
Robert Moore44f6c012005-04-18 22:49:35 -0400218 * RETURN: Status
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 *
220 * DESCRIPTION: Provides an access point to perform synchronization operations
221 * within the AML.
222 *
223 ******************************************************************************/
224
Bob Moorec81da662007-02-02 19:48:18 +0300225acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226{
Len Brown4be44fc2005-08-05 00:44:28 -0400227 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Bob Mooreb229cf92006-04-21 17:15:00 -0400229 ACPI_FUNCTION_TRACE(ex_system_signal_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 if (obj_desc) {
Bob Moore967440e32006-06-23 17:04:00 -0400232 status =
233 acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 }
235
Len Brown4be44fc2005-08-05 00:44:28 -0400236 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237}
238
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239/*******************************************************************************
240 *
241 * FUNCTION: acpi_ex_system_wait_event
242 *
Robert Moore44f6c012005-04-18 22:49:35 -0400243 * PARAMETERS: time_desc - The 'time to delay' object descriptor
244 * obj_desc - The object descriptor for this op
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 *
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
254acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400255acpi_ex_system_wait_event(union acpi_operand_object *time_desc,
256 union acpi_operand_object *obj_desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257{
Len Brown4be44fc2005-08-05 00:44:28 -0400258 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Bob Mooreb229cf92006-04-21 17:15:00 -0400260 ACPI_FUNCTION_TRACE(ex_system_wait_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262 if (obj_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -0400263 status =
Bob Moore967440e32006-06-23 17:04:00 -0400264 acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore,
Len Brown4be44fc2005-08-05 00:44:28 -0400265 (u16) time_desc->integer.
266 value);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 }
268
Len Brown4be44fc2005-08-05 00:44:28 -0400269 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270}
271
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272/*******************************************************************************
273 *
274 * FUNCTION: acpi_ex_system_reset_event
275 *
Robert Moore44f6c012005-04-18 22:49:35 -0400276 * PARAMETERS: obj_desc - The object descriptor for this op
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 *
278 * RETURN: Status
279 *
280 * DESCRIPTION: Reset an event to a known state.
281 *
282 ******************************************************************************/
283
Len Brown4be44fc2005-08-05 00:44:28 -0400284acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285{
Len Brown4be44fc2005-08-05 00:44:28 -0400286 acpi_status status = AE_OK;
Bob Moore967440e32006-06-23 17:04:00 -0400287 acpi_semaphore temp_semaphore;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Len Brown4be44fc2005-08-05 00:44:28 -0400289 ACPI_FUNCTION_ENTRY();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
291 /*
292 * We are going to simply delete the existing semaphore and
293 * create a new one!
294 */
Len Brown4be44fc2005-08-05 00:44:28 -0400295 status =
296 acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
297 if (ACPI_SUCCESS(status)) {
Bob Moore967440e32006-06-23 17:04:00 -0400298 (void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore);
299 obj_desc->event.os_semaphore = temp_semaphore;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 }
301
302 return (status);
303}