2 /******************************************************************************
4 * Module Name: exsystem - Interface to OS services
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2006, 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.
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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
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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.
65 ******************************************************************************/
66 acpi_status acpi_ex_system_wait_semaphore(acpi_handle semaphore, u16 timeout)
71 ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
73 status = acpi_os_wait_semaphore(semaphore, 1, 0);
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_do_stall
108 * PARAMETERS: how_long - The amount of time to stall,
113 * DESCRIPTION: Suspend running thread for specified amount of time.
114 * Note: ACPI specification requires that Stall() does not
115 * relinquish the processor, and delays longer than 100 usec
116 * should use Sleep() instead. We allow stalls up to 255 usec
117 * for compatibility with other interpreters and existing BIOSs.
119 ******************************************************************************/
121 acpi_status acpi_ex_system_do_stall(u32 how_long)
123 acpi_status status = AE_OK;
125 ACPI_FUNCTION_ENTRY();
127 if (how_long > 255) { /* 255 microseconds */
129 * Longer than 255 usec, this is an error
131 * (ACPI specifies 100 usec as max, but this gives some slack in
132 * order to support existing BIOSs)
134 ACPI_ERROR((AE_INFO, "Time parameter is too large (%d)",
136 status = AE_AML_OPERAND_VALUE;
138 acpi_os_stall(how_long);
144 /*******************************************************************************
146 * FUNCTION: acpi_ex_system_do_suspend
148 * PARAMETERS: how_long - The amount of time to suspend,
153 * DESCRIPTION: Suspend running thread for specified amount of time.
155 ******************************************************************************/
157 acpi_status acpi_ex_system_do_suspend(acpi_integer how_long)
161 ACPI_FUNCTION_ENTRY();
163 /* Since this thread will sleep, we must release the interpreter */
165 acpi_ex_exit_interpreter();
167 acpi_os_sleep(how_long);
169 /* And now we must get the interpreter again */
171 status = acpi_ex_enter_interpreter();
175 /*******************************************************************************
177 * FUNCTION: acpi_ex_system_acquire_mutex
179 * PARAMETERS: time_desc - The 'time to delay' object descriptor
180 * obj_desc - The object descriptor for this op
184 * DESCRIPTION: Provides an access point to perform synchronization operations
185 * within the AML. This function will cause a lock to be generated
186 * for the Mutex pointed to by obj_desc.
188 ******************************************************************************/
191 acpi_ex_system_acquire_mutex(union acpi_operand_object * time_desc,
192 union acpi_operand_object * obj_desc)
194 acpi_status status = AE_OK;
196 ACPI_FUNCTION_TRACE_PTR(ex_system_acquire_mutex, obj_desc);
199 return_ACPI_STATUS(AE_BAD_PARAMETER);
202 /* Support for the _GL_ Mutex object -- go get the global lock */
204 if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
206 acpi_ev_acquire_global_lock((u16) time_desc->integer.value);
207 return_ACPI_STATUS(status);
210 status = acpi_ex_system_wait_semaphore(obj_desc->mutex.semaphore,
211 (u16) time_desc->integer.value);
212 return_ACPI_STATUS(status);
215 /*******************************************************************************
217 * FUNCTION: acpi_ex_system_release_mutex
219 * PARAMETERS: obj_desc - The object descriptor for this op
223 * DESCRIPTION: Provides an access point to perform synchronization operations
224 * within the AML. This operation is a request to release a
225 * previously acquired Mutex. If the Mutex variable is set then
226 * it will be decremented.
228 ******************************************************************************/
230 acpi_status acpi_ex_system_release_mutex(union acpi_operand_object *obj_desc)
232 acpi_status status = AE_OK;
234 ACPI_FUNCTION_TRACE(ex_system_release_mutex);
237 return_ACPI_STATUS(AE_BAD_PARAMETER);
240 /* Support for the _GL_ Mutex object -- release the global lock */
242 if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
243 status = acpi_ev_release_global_lock();
244 return_ACPI_STATUS(status);
247 status = acpi_os_signal_semaphore(obj_desc->mutex.semaphore, 1);
248 return_ACPI_STATUS(status);
251 /*******************************************************************************
253 * FUNCTION: acpi_ex_system_signal_event
255 * PARAMETERS: obj_desc - The object descriptor for this op
259 * DESCRIPTION: Provides an access point to perform synchronization operations
262 ******************************************************************************/
264 acpi_status acpi_ex_system_signal_event(union acpi_operand_object *obj_desc)
266 acpi_status status = AE_OK;
268 ACPI_FUNCTION_TRACE(ex_system_signal_event);
271 status = acpi_os_signal_semaphore(obj_desc->event.semaphore, 1);
274 return_ACPI_STATUS(status);
277 /*******************************************************************************
279 * FUNCTION: acpi_ex_system_wait_event
281 * PARAMETERS: time_desc - The 'time to delay' object descriptor
282 * obj_desc - The object descriptor for this op
286 * DESCRIPTION: Provides an access point to perform synchronization operations
287 * within the AML. This operation is a request to wait for an
290 ******************************************************************************/
293 acpi_ex_system_wait_event(union acpi_operand_object *time_desc,
294 union acpi_operand_object *obj_desc)
296 acpi_status status = AE_OK;
298 ACPI_FUNCTION_TRACE(ex_system_wait_event);
302 acpi_ex_system_wait_semaphore(obj_desc->event.semaphore,
303 (u16) time_desc->integer.
307 return_ACPI_STATUS(status);
310 /*******************************************************************************
312 * FUNCTION: acpi_ex_system_reset_event
314 * PARAMETERS: obj_desc - The object descriptor for this op
318 * DESCRIPTION: Reset an event to a known state.
320 ******************************************************************************/
322 acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
324 acpi_status status = AE_OK;
325 void *temp_semaphore;
327 ACPI_FUNCTION_ENTRY();
330 * We are going to simply delete the existing semaphore and
334 acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
335 if (ACPI_SUCCESS(status)) {
336 (void)acpi_os_delete_semaphore(obj_desc->event.semaphore);
337 obj_desc->event.semaphore = temp_semaphore;