2 /******************************************************************************
4 * Module Name: exsystem - Interface to OS services
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2007, R. Byron Moore
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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.
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
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45 #include <acpi/acpi.h>
46 #include <acpi/acinterp.h>
47 #include <acpi/acevents.h>
49 #define _COMPONENT ACPI_EXECUTER
50 ACPI_MODULE_NAME("exsystem")
52 /*******************************************************************************
54 * FUNCTION: acpi_ex_system_wait_semaphore
56 * PARAMETERS: Semaphore - Semaphore to wait on
57 * Timeout - Max time to wait
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.
65 ******************************************************************************/
66 acpi_status
acpi_ex_system_wait_semaphore(acpi_semaphore semaphore
, u16 timeout
)
71 ACPI_FUNCTION_TRACE(ex_system_wait_semaphore
);
73 status
= acpi_os_wait_semaphore(semaphore
, 1, ACPI_DO_NOT_WAIT
);
74 if (ACPI_SUCCESS(status
)) {
75 return_ACPI_STATUS(status
);
78 if (status
== AE_TIME
) {
80 /* We must wait, so unlock the interpreter */
82 acpi_ex_exit_interpreter();
84 status
= acpi_os_wait_semaphore(semaphore
, 1, timeout
);
86 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
,
87 "*** Thread awake after blocking, %s\n",
88 acpi_format_exception(status
)));
90 /* Reacquire the interpreter */
92 status2
= acpi_ex_enter_interpreter();
93 if (ACPI_FAILURE(status2
)) {
95 /* Report fatal error, could not acquire interpreter */
97 return_ACPI_STATUS(status2
);
101 return_ACPI_STATUS(status
);
104 /*******************************************************************************
106 * FUNCTION: acpi_ex_system_wait_mutex
108 * PARAMETERS: Mutex - Mutex to wait on
109 * Timeout - Max time to wait
113 * DESCRIPTION: Implements a mutex wait with a check to see if the
114 * mutex is available immediately. If it is not, the
115 * interpreter is released before waiting.
117 ******************************************************************************/
119 acpi_status
acpi_ex_system_wait_mutex(acpi_mutex mutex
, u16 timeout
)
124 ACPI_FUNCTION_TRACE(ex_system_wait_mutex
);
126 status
= acpi_os_acquire_mutex(mutex
, ACPI_DO_NOT_WAIT
);
127 if (ACPI_SUCCESS(status
)) {
128 return_ACPI_STATUS(status
);
131 if (status
== AE_TIME
) {
133 /* We must wait, so unlock the interpreter */
135 acpi_ex_exit_interpreter();
137 status
= acpi_os_acquire_mutex(mutex
, timeout
);
139 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
,
140 "*** Thread awake after blocking, %s\n",
141 acpi_format_exception(status
)));
143 /* Reacquire the interpreter */
145 status2
= acpi_ex_enter_interpreter();
146 if (ACPI_FAILURE(status2
)) {
148 /* Report fatal error, could not acquire interpreter */
150 return_ACPI_STATUS(status2
);
154 return_ACPI_STATUS(status
);
157 /*******************************************************************************
159 * FUNCTION: acpi_ex_system_do_stall
161 * PARAMETERS: how_long - The amount of time to stall,
166 * DESCRIPTION: Suspend running thread for specified amount of time.
167 * Note: ACPI specification requires that Stall() does not
168 * relinquish the processor, and delays longer than 100 usec
169 * should use Sleep() instead. We allow stalls up to 255 usec
170 * for compatibility with other interpreters and existing BIOSs.
172 ******************************************************************************/
174 acpi_status
acpi_ex_system_do_stall(u32 how_long
)
176 acpi_status status
= AE_OK
;
178 ACPI_FUNCTION_ENTRY();
180 if (how_long
> 255) { /* 255 microseconds */
182 * Longer than 255 usec, this is an error
184 * (ACPI specifies 100 usec as max, but this gives some slack in
185 * order to support existing BIOSs)
187 ACPI_ERROR((AE_INFO
, "Time parameter is too large (%d)",
189 status
= AE_AML_OPERAND_VALUE
;
191 acpi_os_stall(how_long
);
197 /*******************************************************************************
199 * FUNCTION: acpi_ex_system_do_suspend
201 * PARAMETERS: how_long - The amount of time to suspend,
206 * DESCRIPTION: Suspend running thread for specified amount of time.
208 ******************************************************************************/
210 acpi_status
acpi_ex_system_do_suspend(acpi_integer how_long
)
214 ACPI_FUNCTION_ENTRY();
216 /* Since this thread will sleep, we must release the interpreter */
218 acpi_ex_exit_interpreter();
220 acpi_os_sleep(how_long
);
222 /* And now we must get the interpreter again */
224 status
= acpi_ex_enter_interpreter();
228 /*******************************************************************************
230 * FUNCTION: acpi_ex_system_signal_event
232 * PARAMETERS: obj_desc - The object descriptor for this op
236 * DESCRIPTION: Provides an access point to perform synchronization operations
239 ******************************************************************************/
241 acpi_status
acpi_ex_system_signal_event(union acpi_operand_object
* obj_desc
)
243 acpi_status status
= AE_OK
;
245 ACPI_FUNCTION_TRACE(ex_system_signal_event
);
249 acpi_os_signal_semaphore(obj_desc
->event
.os_semaphore
, 1);
252 return_ACPI_STATUS(status
);
255 /*******************************************************************************
257 * FUNCTION: acpi_ex_system_wait_event
259 * PARAMETERS: time_desc - The 'time to delay' object descriptor
260 * obj_desc - The object descriptor for this op
264 * DESCRIPTION: Provides an access point to perform synchronization operations
265 * within the AML. This operation is a request to wait for an
268 ******************************************************************************/
271 acpi_ex_system_wait_event(union acpi_operand_object
*time_desc
,
272 union acpi_operand_object
*obj_desc
)
274 acpi_status status
= AE_OK
;
276 ACPI_FUNCTION_TRACE(ex_system_wait_event
);
280 acpi_ex_system_wait_semaphore(obj_desc
->event
.os_semaphore
,
281 (u16
) time_desc
->integer
.
285 return_ACPI_STATUS(status
);
288 /*******************************************************************************
290 * FUNCTION: acpi_ex_system_reset_event
292 * PARAMETERS: obj_desc - The object descriptor for this op
296 * DESCRIPTION: Reset an event to a known state.
298 ******************************************************************************/
300 acpi_status
acpi_ex_system_reset_event(union acpi_operand_object
*obj_desc
)
302 acpi_status status
= AE_OK
;
303 acpi_semaphore temp_semaphore
;
305 ACPI_FUNCTION_ENTRY();
308 * We are going to simply delete the existing semaphore and
312 acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT
, 0, &temp_semaphore
);
313 if (ACPI_SUCCESS(status
)) {
314 (void)acpi_os_delete_semaphore(obj_desc
->event
.os_semaphore
);
315 obj_desc
->event
.os_semaphore
= temp_semaphore
;