2 /******************************************************************************
4 * Module Name: exsystem - Interface to OS services
7 *****************************************************************************/
9 /******************************************************************************
13 * Some or all of this work - Copyright (c) 1999 - 2004, Intel Corp.
14 * All rights reserved.
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
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
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;
39 * The above copyright and patent license is granted only if the following
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.
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
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
74 * 3.4. Intel retains all right, title, and interest in and to the Original
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.
82 * 4. Disclaimer and Export Compliance
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
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
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.
116 *****************************************************************************/
118 #define __EXSYSTEM_C__
121 #include "acinterp.h"
122 #include "acevents.h"
124 #define _COMPONENT ACPI_EXECUTER
125 ACPI_MODULE_NAME ("exsystem")
128 /*******************************************************************************
130 * FUNCTION: AcpiExSystemWaitSemaphore
132 * PARAMETERS: Semaphore - OSD semaphore to wait on
133 * Timeout - Max time to wait
137 * DESCRIPTION: Implements a semaphore wait with a check to see if the
138 * semaphore is available immediately. If it is not, the
139 * interpreter is released.
141 ******************************************************************************/
144 AcpiExSystemWaitSemaphore (
145 ACPI_HANDLE Semaphore,
152 ACPI_FUNCTION_TRACE ("ExSystemWaitSemaphore");
155 Status = AcpiOsWaitSemaphore (Semaphore, 1, 0);
156 if (ACPI_SUCCESS (Status))
158 return_ACPI_STATUS (Status);
161 if (Status == AE_TIME)
163 /* We must wait, so unlock the interpreter */
165 AcpiExExitInterpreter ();
167 Status = AcpiOsWaitSemaphore (Semaphore, 1, Timeout);
169 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "*** Thread awake after blocking, %s\n",
170 AcpiFormatException (Status)));
172 /* Reacquire the interpreter */
174 Status2 = AcpiExEnterInterpreter ();
175 if (ACPI_FAILURE (Status2))
177 /* Report fatal error, could not acquire interpreter */
179 return_ACPI_STATUS (Status2);
183 return_ACPI_STATUS (Status);
187 /*******************************************************************************
189 * FUNCTION: AcpiExSystemDoStall
191 * PARAMETERS: HowLong - The amount of time to stall,
196 * DESCRIPTION: Suspend running thread for specified amount of time.
197 * Note: ACPI specification requires that Stall() does not
198 * relinquish the processor, and delays longer than 100 usec
199 * should use Sleep() instead. We allow stalls up to 255 usec
200 * for compatibility with other interpreters and existing BIOSs.
202 ******************************************************************************/
205 AcpiExSystemDoStall (
208 ACPI_STATUS Status = AE_OK;
211 ACPI_FUNCTION_ENTRY ();
214 if (HowLong > 255) /* 255 microseconds */
217 * Longer than 255 usec, this is an error
219 * (ACPI specifies 100 usec as max, but this gives some slack in
220 * order to support existing BIOSs)
222 ACPI_REPORT_ERROR (("Stall: Time parameter is too large (%d)\n", HowLong));
223 Status = AE_AML_OPERAND_VALUE;
227 AcpiOsStall (HowLong);
234 /*******************************************************************************
236 * FUNCTION: AcpiExSystemDoSuspend
238 * PARAMETERS: HowLong - The amount of time to suspend,
243 * DESCRIPTION: Suspend running thread for specified amount of time.
245 ******************************************************************************/
248 AcpiExSystemDoSuspend (
254 ACPI_FUNCTION_ENTRY ();
257 /* Since this thread will sleep, we must release the interpreter */
259 AcpiExExitInterpreter ();
261 AcpiOsSleep ((UINT16) (HowLong / (UINT32) 1000),
262 (UINT16) (HowLong % (UINT32) 1000));
264 /* And now we must get the interpreter again */
266 Status = AcpiExEnterInterpreter ();
271 /*******************************************************************************
273 * FUNCTION: AcpiExSystemAcquireMutex
275 * PARAMETERS: *TimeDesc - The 'time to delay' object descriptor
276 * *ObjDesc - The object descriptor for this op
280 * DESCRIPTION: Provides an access point to perform synchronization operations
281 * within the AML. This function will cause a lock to be generated
282 * for the Mutex pointed to by ObjDesc.
284 ******************************************************************************/
287 AcpiExSystemAcquireMutex (
288 ACPI_OPERAND_OBJECT *TimeDesc,
289 ACPI_OPERAND_OBJECT *ObjDesc)
291 ACPI_STATUS Status = AE_OK;
294 ACPI_FUNCTION_TRACE_PTR ("ExSystemAcquireMutex", ObjDesc);
299 return_ACPI_STATUS (AE_BAD_PARAMETER);
303 * Support for the _GL_ Mutex object -- go get the global lock
305 if (ObjDesc->Mutex.Semaphore == AcpiGbl_GlobalLockSemaphore)
307 Status = AcpiEvAcquireGlobalLock ((UINT16) TimeDesc->Integer.Value);
308 return_ACPI_STATUS (Status);
311 Status = AcpiExSystemWaitSemaphore (ObjDesc->Mutex.Semaphore,
312 (UINT16) TimeDesc->Integer.Value);
313 return_ACPI_STATUS (Status);
317 /*******************************************************************************
319 * FUNCTION: AcpiExSystemReleaseMutex
321 * PARAMETERS: *ObjDesc - The object descriptor for this op
325 * DESCRIPTION: Provides an access point to perform synchronization operations
326 * within the AML. This operation is a request to release a
327 * previously acquired Mutex. If the Mutex variable is set then
328 * it will be decremented.
330 ******************************************************************************/
333 AcpiExSystemReleaseMutex (
334 ACPI_OPERAND_OBJECT *ObjDesc)
336 ACPI_STATUS Status = AE_OK;
339 ACPI_FUNCTION_TRACE ("ExSystemReleaseMutex");
344 return_ACPI_STATUS (AE_BAD_PARAMETER);
348 * Support for the _GL_ Mutex object -- release the global lock
350 if (ObjDesc->Mutex.Semaphore == AcpiGbl_GlobalLockSemaphore)
352 Status = AcpiEvReleaseGlobalLock ();
353 return_ACPI_STATUS (Status);
356 Status = AcpiOsSignalSemaphore (ObjDesc->Mutex.Semaphore, 1);
357 return_ACPI_STATUS (Status);
361 /*******************************************************************************
363 * FUNCTION: AcpiExSystemSignalEvent
365 * PARAMETERS: *ObjDesc - The object descriptor for this op
369 * DESCRIPTION: Provides an access point to perform synchronization operations
372 ******************************************************************************/
375 AcpiExSystemSignalEvent (
376 ACPI_OPERAND_OBJECT *ObjDesc)
378 ACPI_STATUS Status = AE_OK;
381 ACPI_FUNCTION_TRACE ("ExSystemSignalEvent");
386 Status = AcpiOsSignalSemaphore (ObjDesc->Event.Semaphore, 1);
389 return_ACPI_STATUS (Status);
393 /*******************************************************************************
395 * FUNCTION: AcpiExSystemWaitEvent
397 * PARAMETERS: *TimeDesc - The 'time to delay' object descriptor
398 * *ObjDesc - The object descriptor for this op
402 * DESCRIPTION: Provides an access point to perform synchronization operations
403 * within the AML. This operation is a request to wait for an
406 ******************************************************************************/
409 AcpiExSystemWaitEvent (
410 ACPI_OPERAND_OBJECT *TimeDesc,
411 ACPI_OPERAND_OBJECT *ObjDesc)
413 ACPI_STATUS Status = AE_OK;
416 ACPI_FUNCTION_TRACE ("ExSystemWaitEvent");
421 Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.Semaphore,
422 (UINT16) TimeDesc->Integer.Value);
425 return_ACPI_STATUS (Status);
429 /*******************************************************************************
431 * FUNCTION: AcpiExSystemResetEvent
433 * PARAMETERS: *ObjDesc - The object descriptor for this op
437 * DESCRIPTION: Reset an event to a known state.
439 ******************************************************************************/
442 AcpiExSystemResetEvent (
443 ACPI_OPERAND_OBJECT *ObjDesc)
445 ACPI_STATUS Status = AE_OK;
449 ACPI_FUNCTION_ENTRY ();
453 * We are going to simply delete the existing semaphore and
456 Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore);
457 if (ACPI_SUCCESS (Status))
459 (void) AcpiOsDeleteSemaphore (ObjDesc->Event.Semaphore);
460 ObjDesc->Event.Semaphore = TempSemaphore;