Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
os
linux
1
2/******************************************************************************
3 *
4 * Module Name: exsystem - Interface to OS services
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2005, R. Byron Moore
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
46#include <acpi/acpi.h>
47#include <acpi/acinterp.h>
48#include <acpi/acevents.h>
49
50#define _COMPONENT ACPI_EXECUTER
51 ACPI_MODULE_NAME ("exsystem")
52
53
54/*******************************************************************************
55 *
56 * FUNCTION: acpi_ex_system_wait_semaphore
57 *
58 * PARAMETERS: Semaphore - OSD semaphore to wait on
59 * Timeout - Max time to wait
60 *
61 * RETURN: Status
62 *
63 * DESCRIPTION: Implements a semaphore wait with a check to see if the
64 * semaphore is available immediately. If it is not, the
65 * interpreter is released.
66 *
67 ******************************************************************************/
68
69acpi_status
70acpi_ex_system_wait_semaphore (
71 acpi_handle semaphore,
72 u16 timeout)
73{
74 acpi_status status;
75 acpi_status status2;
76
77
78 ACPI_FUNCTION_TRACE ("ex_system_wait_semaphore");
79
80
81 status = acpi_os_wait_semaphore (semaphore, 1, 0);
82 if (ACPI_SUCCESS (status)) {
83 return_ACPI_STATUS (status);
84 }
85
86 if (status == AE_TIME) {
87 /* We must wait, so unlock the interpreter */
88
89 acpi_ex_exit_interpreter ();
90
91 status = acpi_os_wait_semaphore (semaphore, 1, timeout);
92
93 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "*** Thread awake after blocking, %s\n",
94 acpi_format_exception (status)));
95
96 /* Reacquire the interpreter */
97
98 status2 = acpi_ex_enter_interpreter ();
99 if (ACPI_FAILURE (status2)) {
100 /* Report fatal error, could not acquire interpreter */
101
102 return_ACPI_STATUS (status2);
103 }
104 }
105
106 return_ACPI_STATUS (status);
107}
108
109
110/*******************************************************************************
111 *
112 * FUNCTION: acpi_ex_system_do_stall
113 *
114 * PARAMETERS: how_long - The amount of time to stall,
115 * in microseconds
116 *
117 * RETURN: Status
118 *
119 * DESCRIPTION: Suspend running thread for specified amount of time.
120 * Note: ACPI specification requires that Stall() does not
121 * relinquish the processor, and delays longer than 100 usec
122 * should use Sleep() instead. We allow stalls up to 255 usec
123 * for compatibility with other interpreters and existing BIOSs.
124 *
125 ******************************************************************************/
126
127acpi_status
128acpi_ex_system_do_stall (
129 u32 how_long)
130{
131 acpi_status status = AE_OK;
132
133
134 ACPI_FUNCTION_ENTRY ();
135
136
137 if (how_long > 255) /* 255 microseconds */ {
138 /*
139 * Longer than 255 usec, this is an error
140 *
141 * (ACPI specifies 100 usec as max, but this gives some slack in
142 * order to support existing BIOSs)
143 */
144 ACPI_REPORT_ERROR (("Stall: Time parameter is too large (%d)\n", how_long));
145 status = AE_AML_OPERAND_VALUE;
146 }
147 else {
148 acpi_os_stall (how_long);
149 }
150
151 return (status);
152}
153
154
155/*******************************************************************************
156 *
157 * FUNCTION: acpi_ex_system_do_suspend
158 *
159 * PARAMETERS: how_long - The amount of time to suspend,
160 * in milliseconds
161 *
162 * RETURN: None
163 *
164 * DESCRIPTION: Suspend running thread for specified amount of time.
165 *
166 ******************************************************************************/
167
168acpi_status
169acpi_ex_system_do_suspend (
170 acpi_integer how_long)
171{
172 acpi_status status;
173
174
175 ACPI_FUNCTION_ENTRY ();
176
177
178 /* Since this thread will sleep, we must release the interpreter */
179
180 acpi_ex_exit_interpreter ();
181
182 acpi_os_sleep (how_long);
183
184 /* And now we must get the interpreter again */
185
186 status = acpi_ex_enter_interpreter ();
187 return (status);
188}
189
190
191/*******************************************************************************
192 *
193 * FUNCTION: acpi_ex_system_acquire_mutex
194 *
195 * PARAMETERS: *time_desc - The 'time to delay' object descriptor
196 * *obj_desc - The object descriptor for this op
197 *
198 * RETURN: Status
199 *
200 * DESCRIPTION: Provides an access point to perform synchronization operations
201 * within the AML. This function will cause a lock to be generated
202 * for the Mutex pointed to by obj_desc.
203 *
204 ******************************************************************************/
205
206acpi_status
207acpi_ex_system_acquire_mutex (
208 union acpi_operand_object *time_desc,
209 union acpi_operand_object *obj_desc)
210{
211 acpi_status status = AE_OK;
212
213
214 ACPI_FUNCTION_TRACE_PTR ("ex_system_acquire_mutex", obj_desc);
215
216
217 if (!obj_desc) {
218 return_ACPI_STATUS (AE_BAD_PARAMETER);
219 }
220
221 /*
222 * Support for the _GL_ Mutex object -- go get the global lock
223 */
224 if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
225 status = acpi_ev_acquire_global_lock ((u16) time_desc->integer.value);
226 return_ACPI_STATUS (status);
227 }
228
229 status = acpi_ex_system_wait_semaphore (obj_desc->mutex.semaphore,
230 (u16) time_desc->integer.value);
231 return_ACPI_STATUS (status);
232}
233
234
235/*******************************************************************************
236 *
237 * FUNCTION: acpi_ex_system_release_mutex
238 *
239 * PARAMETERS: *obj_desc - The object descriptor for this op
240 *
241 * RETURN: Status
242 *
243 * DESCRIPTION: Provides an access point to perform synchronization operations
244 * within the AML. This operation is a request to release a
245 * previously acquired Mutex. If the Mutex variable is set then
246 * it will be decremented.
247 *
248 ******************************************************************************/
249
250acpi_status
251acpi_ex_system_release_mutex (
252 union acpi_operand_object *obj_desc)
253{
254 acpi_status status = AE_OK;
255
256
257 ACPI_FUNCTION_TRACE ("ex_system_release_mutex");
258
259
260 if (!obj_desc) {
261 return_ACPI_STATUS (AE_BAD_PARAMETER);
262 }
263
264 /*
265 * Support for the _GL_ Mutex object -- release the global lock
266 */
267 if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
268 status = acpi_ev_release_global_lock ();
269 return_ACPI_STATUS (status);
270 }
271
272 status = acpi_os_signal_semaphore (obj_desc->mutex.semaphore, 1);
273 return_ACPI_STATUS (status);
274}
275
276
277/*******************************************************************************
278 *
279 * FUNCTION: acpi_ex_system_signal_event
280 *
281 * PARAMETERS: *obj_desc - The object descriptor for this op
282 *
283 * RETURN: AE_OK
284 *
285 * DESCRIPTION: Provides an access point to perform synchronization operations
286 * within the AML.
287 *
288 ******************************************************************************/
289
290acpi_status
291acpi_ex_system_signal_event (
292 union acpi_operand_object *obj_desc)
293{
294 acpi_status status = AE_OK;
295
296
297 ACPI_FUNCTION_TRACE ("ex_system_signal_event");
298
299
300 if (obj_desc) {
301 status = acpi_os_signal_semaphore (obj_desc->event.semaphore, 1);
302 }
303
304 return_ACPI_STATUS (status);
305}
306
307
308/*******************************************************************************
309 *
310 * FUNCTION: acpi_ex_system_wait_event
311 *
312 * PARAMETERS: *time_desc - The 'time to delay' object descriptor
313 * *obj_desc - The object descriptor for this op
314 *
315 * RETURN: Status
316 *
317 * DESCRIPTION: Provides an access point to perform synchronization operations
318 * within the AML. This operation is a request to wait for an
319 * event.
320 *
321 ******************************************************************************/
322
323acpi_status
324acpi_ex_system_wait_event (
325 union acpi_operand_object *time_desc,
326 union acpi_operand_object *obj_desc)
327{
328 acpi_status status = AE_OK;
329
330
331 ACPI_FUNCTION_TRACE ("ex_system_wait_event");
332
333
334 if (obj_desc) {
335 status = acpi_ex_system_wait_semaphore (obj_desc->event.semaphore,
336 (u16) time_desc->integer.value);
337 }
338
339 return_ACPI_STATUS (status);
340}
341
342
343/*******************************************************************************
344 *
345 * FUNCTION: acpi_ex_system_reset_event
346 *
347 * PARAMETERS: *obj_desc - The object descriptor for this op
348 *
349 * RETURN: Status
350 *
351 * DESCRIPTION: Reset an event to a known state.
352 *
353 ******************************************************************************/
354
355acpi_status
356acpi_ex_system_reset_event (
357 union acpi_operand_object *obj_desc)
358{
359 acpi_status status = AE_OK;
360 void *temp_semaphore;
361
362
363 ACPI_FUNCTION_ENTRY ();
364
365
366 /*
367 * We are going to simply delete the existing semaphore and
368 * create a new one!
369 */
370 status = acpi_os_create_semaphore (ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
371 if (ACPI_SUCCESS (status)) {
372 (void) acpi_os_delete_semaphore (obj_desc->event.semaphore);
373 obj_desc->event.semaphore = temp_semaphore;
374 }
375
376 return (status);
377}
378