exsystem.c revision 7851:e828bbb1689c 
1
2/******************************************************************************
3 *
4 * Module Name: exsystem - Interface to OS services
5 *              $Revision: 1.95 $
6 *
7 *****************************************************************************/
8
9/******************************************************************************
10 *
11 * 1. Copyright Notice
12 *
13 * Some or all of this work - Copyright (c) 1999 - 2008, Intel Corp.
14 * All rights reserved.
15 *
16 * 2. License
17 *
18 * 2.1. This is your license from Intel Corp. under its intellectual property
19 * rights.  You may have additional license terms from the party that provided
20 * you this software, covering your right to use that party's intellectual
21 * property rights.
22 *
23 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
24 * copy of the source code appearing in this file ("Covered Code") an
25 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
26 * base code distributed originally by Intel ("Original Intel Code") to copy,
27 * make derivatives, distribute, use and display any portion of the Covered
28 * Code in any form, with the right to sublicense such rights; and
29 *
30 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
31 * license (with the right to sublicense), under only those claims of Intel
32 * patents that are infringed by the Original Intel Code, to make, use, sell,
33 * offer to sell, and import the Covered Code and derivative works thereof
34 * solely to the minimum extent necessary to exercise the above copyright
35 * license, and in no event shall the patent license extend to any additions
36 * to or modifications of the Original Intel Code.  No other license or right
37 * is granted directly or by implication, estoppel or otherwise;
38 *
39 * The above copyright and patent license is granted only if the following
40 * conditions are met:
41 *
42 * 3. Conditions
43 *
44 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
45 * Redistribution of source code of any substantial portion of the Covered
46 * Code or modification with rights to further distribute source must include
47 * the above Copyright Notice, the above License, this list of Conditions,
48 * and the following Disclaimer and Export Compliance provision.  In addition,
49 * Licensee must cause all Covered Code to which Licensee contributes to
50 * contain a file documenting the changes Licensee made to create that Covered
51 * Code and the date of any change.  Licensee must include in that file the
52 * documentation of any changes made by any predecessor Licensee.  Licensee
53 * must include a prominent statement that the modification is derived,
54 * directly or indirectly, from Original Intel Code.
55 *
56 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
57 * Redistribution of source code of any substantial portion of the Covered
58 * Code or modification without rights to further distribute source must
59 * include the following Disclaimer and Export Compliance provision in the
60 * documentation and/or other materials provided with distribution.  In
61 * addition, Licensee may not authorize further sublicense of source of any
62 * portion of the Covered Code, and must include terms to the effect that the
63 * license from Licensee to its licensee is limited to the intellectual
64 * property embodied in the software Licensee provides to its licensee, and
65 * not to intellectual property embodied in modifications its licensee may
66 * make.
67 *
68 * 3.3. Redistribution of Executable. Redistribution in executable form of any
69 * substantial portion of the Covered Code or modification must reproduce the
70 * above Copyright Notice, and the following Disclaimer and Export Compliance
71 * provision in the documentation and/or other materials provided with the
72 * distribution.
73 *
74 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * Intel Code.
76 *
77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
78 * Intel shall be used in advertising or otherwise to promote the sale, use or
79 * other dealings in products derived from or relating to the Covered Code
80 * without prior written authorization from Intel.
81 *
82 * 4. Disclaimer and Export Compliance
83 *
84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
85 * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
87 * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
88 * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
89 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
90 * PARTICULAR PURPOSE.
91 *
92 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
93 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
94 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
95 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
96 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
97 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
98 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
99 * LIMITED REMEDY.
100 *
101 * 4.3. Licensee shall not export, either directly or indirectly, any of this
102 * software or system incorporating such software without first obtaining any
103 * required license or other approval from the U. S. Department of Commerce or
104 * any other agency or department of the United States Government.  In the
105 * event Licensee exports any such software from the United States or
106 * re-exports any such software from a foreign destination, Licensee shall
107 * ensure that the distribution and export/re-export of the software is in
108 * compliance with all laws, regulations, orders, or other restrictions of the
109 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
110 * any of its subsidiaries will export/re-export any technical data, process,
111 * software, or service, directly or indirectly, to any country for which the
112 * United States government or any agency thereof requires an export license,
113 * other governmental approval, or letter of assurance, without first obtaining
114 * such license, approval or letter.
115 *
116 *****************************************************************************/
117
118#define __EXSYSTEM_C__
119
120#include "acpi.h"
121#include "acinterp.h"
122
123#define _COMPONENT          ACPI_EXECUTER
124        ACPI_MODULE_NAME    ("exsystem")
125
126
127/*******************************************************************************
128 *
129 * FUNCTION:    AcpiExSystemWaitSemaphore
130 *
131 * PARAMETERS:  Semaphore       - Semaphore to wait on
132 *              Timeout         - Max time to wait
133 *
134 * RETURN:      Status
135 *
136 * DESCRIPTION: Implements a semaphore wait with a check to see if the
137 *              semaphore is available immediately.  If it is not, the
138 *              interpreter is released before waiting.
139 *
140 ******************************************************************************/
141
142ACPI_STATUS
143AcpiExSystemWaitSemaphore (
144    ACPI_SEMAPHORE          Semaphore,
145    UINT16                  Timeout)
146{
147    ACPI_STATUS             Status;
148
149
150    ACPI_FUNCTION_TRACE (ExSystemWaitSemaphore);
151
152
153    Status = AcpiOsWaitSemaphore (Semaphore, 1, ACPI_DO_NOT_WAIT);
154    if (ACPI_SUCCESS (Status))
155    {
156        return_ACPI_STATUS (Status);
157    }
158
159    if (Status == AE_TIME)
160    {
161        /* We must wait, so unlock the interpreter */
162
163        AcpiExRelinquishInterpreter ();
164
165        Status = AcpiOsWaitSemaphore (Semaphore, 1, Timeout);
166
167        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
168            "*** Thread awake after blocking, %s\n",
169            AcpiFormatException (Status)));
170
171        /* Reacquire the interpreter */
172
173       AcpiExReacquireInterpreter ();
174    }
175
176    return_ACPI_STATUS (Status);
177}
178
179
180/*******************************************************************************
181 *
182 * FUNCTION:    AcpiExSystemWaitMutex
183 *
184 * PARAMETERS:  Mutex           - Mutex to wait on
185 *              Timeout         - Max time to wait
186 *
187 * RETURN:      Status
188 *
189 * DESCRIPTION: Implements a mutex wait with a check to see if the
190 *              mutex is available immediately.  If it is not, the
191 *              interpreter is released before waiting.
192 *
193 ******************************************************************************/
194
195ACPI_STATUS
196AcpiExSystemWaitMutex (
197    ACPI_MUTEX              Mutex,
198    UINT16                  Timeout)
199{
200    ACPI_STATUS             Status;
201
202
203    ACPI_FUNCTION_TRACE (ExSystemWaitMutex);
204
205
206    Status = AcpiOsAcquireMutex (Mutex, ACPI_DO_NOT_WAIT);
207    if (ACPI_SUCCESS (Status))
208    {
209        return_ACPI_STATUS (Status);
210    }
211
212    if (Status == AE_TIME)
213    {
214        /* We must wait, so unlock the interpreter */
215
216        AcpiExRelinquishInterpreter ();
217
218        Status = AcpiOsAcquireMutex (Mutex, Timeout);
219
220        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
221            "*** Thread awake after blocking, %s\n",
222            AcpiFormatException (Status)));
223
224        /* Reacquire the interpreter */
225
226        AcpiExReacquireInterpreter ();
227    }
228
229    return_ACPI_STATUS (Status);
230}
231
232
233/*******************************************************************************
234 *
235 * FUNCTION:    AcpiExSystemDoStall
236 *
237 * PARAMETERS:  HowLong         - The amount of time to stall,
238 *                                in microseconds
239 *
240 * RETURN:      Status
241 *
242 * DESCRIPTION: Suspend running thread for specified amount of time.
243 *              Note: ACPI specification requires that Stall() does not
244 *              relinquish the processor, and delays longer than 100 usec
245 *              should use Sleep() instead.  We allow stalls up to 255 usec
246 *              for compatibility with other interpreters and existing BIOSs.
247 *
248 ******************************************************************************/
249
250ACPI_STATUS
251AcpiExSystemDoStall (
252    UINT32                  HowLong)
253{
254    ACPI_STATUS             Status = AE_OK;
255
256
257    ACPI_FUNCTION_ENTRY ();
258
259
260    if (HowLong > 255) /* 255 microseconds */
261    {
262        /*
263         * Longer than 255 usec, this is an error
264         *
265         * (ACPI specifies 100 usec as max, but this gives some slack in
266         * order to support existing BIOSs)
267         */
268        ACPI_ERROR ((AE_INFO, "Time parameter is too large (%d)",
269            HowLong));
270        Status = AE_AML_OPERAND_VALUE;
271    }
272    else
273    {
274        AcpiOsStall (HowLong);
275    }
276
277    return (Status);
278}
279
280
281/*******************************************************************************
282 *
283 * FUNCTION:    AcpiExSystemDoSuspend
284 *
285 * PARAMETERS:  HowLong         - The amount of time to suspend,
286 *                                in milliseconds
287 *
288 * RETURN:      None
289 *
290 * DESCRIPTION: Suspend running thread for specified amount of time.
291 *
292 ******************************************************************************/
293
294ACPI_STATUS
295AcpiExSystemDoSuspend (
296    ACPI_INTEGER            HowLong)
297{
298    ACPI_FUNCTION_ENTRY ();
299
300
301    /* Since this thread will sleep, we must release the interpreter */
302
303    AcpiExRelinquishInterpreter ();
304
305    AcpiOsSleep (HowLong);
306
307    /* And now we must get the interpreter again */
308
309    AcpiExReacquireInterpreter ();
310    return (AE_OK);
311}
312
313
314/*******************************************************************************
315 *
316 * FUNCTION:    AcpiExSystemSignalEvent
317 *
318 * PARAMETERS:  ObjDesc         - The object descriptor for this op
319 *
320 * RETURN:      Status
321 *
322 * DESCRIPTION: Provides an access point to perform synchronization operations
323 *              within the AML.
324 *
325 ******************************************************************************/
326
327ACPI_STATUS
328AcpiExSystemSignalEvent (
329    ACPI_OPERAND_OBJECT     *ObjDesc)
330{
331    ACPI_STATUS             Status = AE_OK;
332
333
334    ACPI_FUNCTION_TRACE (ExSystemSignalEvent);
335
336
337    if (ObjDesc)
338    {
339        Status = AcpiOsSignalSemaphore (ObjDesc->Event.OsSemaphore, 1);
340    }
341
342    return_ACPI_STATUS (Status);
343}
344
345
346/*******************************************************************************
347 *
348 * FUNCTION:    AcpiExSystemWaitEvent
349 *
350 * PARAMETERS:  TimeDesc        - The 'time to delay' object descriptor
351 *              ObjDesc         - The object descriptor for this op
352 *
353 * RETURN:      Status
354 *
355 * DESCRIPTION: Provides an access point to perform synchronization operations
356 *              within the AML.  This operation is a request to wait for an
357 *              event.
358 *
359 ******************************************************************************/
360
361ACPI_STATUS
362AcpiExSystemWaitEvent (
363    ACPI_OPERAND_OBJECT     *TimeDesc,
364    ACPI_OPERAND_OBJECT     *ObjDesc)
365{
366    ACPI_STATUS             Status = AE_OK;
367
368
369    ACPI_FUNCTION_TRACE (ExSystemWaitEvent);
370
371
372    if (ObjDesc)
373    {
374        Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.OsSemaphore,
375                    (UINT16) TimeDesc->Integer.Value);
376    }
377
378    return_ACPI_STATUS (Status);
379}
380
381
382/*******************************************************************************
383 *
384 * FUNCTION:    AcpiExSystemResetEvent
385 *
386 * PARAMETERS:  ObjDesc         - The object descriptor for this op
387 *
388 * RETURN:      Status
389 *
390 * DESCRIPTION: Reset an event to a known state.
391 *
392 ******************************************************************************/
393
394ACPI_STATUS
395AcpiExSystemResetEvent (
396    ACPI_OPERAND_OBJECT     *ObjDesc)
397{
398    ACPI_STATUS             Status = AE_OK;
399    ACPI_SEMAPHORE          TempSemaphore;
400
401
402    ACPI_FUNCTION_ENTRY ();
403
404
405    /*
406     * We are going to simply delete the existing semaphore and
407     * create a new one!
408     */
409    Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore);
410    if (ACPI_SUCCESS (Status))
411    {
412        (void) AcpiOsDeleteSemaphore (ObjDesc->Event.OsSemaphore);
413        ObjDesc->Event.OsSemaphore = TempSemaphore;
414    }
415
416    return (Status);
417}
418
419