1 /******************************************************************************
3 * Module Name: evxface - External interfaces for ACPI events
6 *****************************************************************************/
8 /******************************************************************************
12 * Some or all of this work - Copyright (c) 1999 - 2007, Intel Corp.
13 * All rights reserved.
17 * 2.1. This is your license from Intel Corp. under its intellectual property
18 * rights. You may have additional license terms from the party that provided
19 * you this software, covering your right to use that party's intellectual
22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
23 * copy of the source code appearing in this file ("Covered Code") an
24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
25 * base code distributed originally by Intel ("Original Intel Code") to copy,
26 * make derivatives, distribute, use and display any portion of the Covered
27 * Code in any form, with the right to sublicense such rights; and
29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
30 * license (with the right to sublicense), under only those claims of Intel
31 * patents that are infringed by the Original Intel Code, to make, use, sell,
32 * offer to sell, and import the Covered Code and derivative works thereof
33 * solely to the minimum extent necessary to exercise the above copyright
34 * license, and in no event shall the patent license extend to any additions
35 * to or modifications of the Original Intel Code. No other license or right
36 * is granted directly or by implication, estoppel or otherwise;
38 * The above copyright and patent license is granted only if the following
43 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
44 * Redistribution of source code of any substantial portion of the Covered
45 * Code or modification with rights to further distribute source must include
46 * the above Copyright Notice, the above License, this list of Conditions,
47 * and the following Disclaimer and Export Compliance provision. In addition,
48 * Licensee must cause all Covered Code to which Licensee contributes to
49 * contain a file documenting the changes Licensee made to create that Covered
50 * Code and the date of any change. Licensee must include in that file the
51 * documentation of any changes made by any predecessor Licensee. Licensee
52 * must include a prominent statement that the modification is derived,
53 * directly or indirectly, from Original Intel Code.
55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
56 * Redistribution of source code of any substantial portion of the Covered
57 * Code or modification without rights to further distribute source must
58 * include the following Disclaimer and Export Compliance provision in the
59 * documentation and/or other materials provided with distribution. In
60 * addition, Licensee may not authorize further sublicense of source of any
61 * portion of the Covered Code, and must include terms to the effect that the
62 * license from Licensee to its licensee is limited to the intellectual
63 * property embodied in the software Licensee provides to its licensee, and
64 * not to intellectual property embodied in modifications its licensee may
67 * 3.3. Redistribution of Executable. Redistribution in executable form of any
68 * substantial portion of the Covered Code or modification must reproduce the
69 * above Copyright Notice, and the following Disclaimer and Export Compliance
70 * provision in the documentation and/or other materials provided with the
73 * 3.4. Intel retains all right, title, and interest in and to the Original
76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
77 * Intel shall be used in advertising or otherwise to promote the sale, use or
78 * other dealings in products derived from or relating to the Covered Code
79 * without prior written authorization from Intel.
81 * 4. Disclaimer and Export Compliance
83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
100 * 4.3. Licensee shall not export, either directly or indirectly, any of this
101 * software or system incorporating such software without first obtaining any
102 * required license or other approval from the U. S. Department of Commerce or
103 * any other agency or department of the United States Government. In the
104 * event Licensee exports any such software from the United States or
105 * re-exports any such software from a foreign destination, Licensee shall
106 * ensure that the distribution and export/re-export of the software is in
107 * compliance with all laws, regulations, orders, or other restrictions of the
108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
109 * any of its subsidiaries will export/re-export any technical data, process,
110 * software, or service, directly or indirectly, to any country for which the
111 * United States government or any agency thereof requires an export license,
112 * other governmental approval, or letter of assurance, without first obtaining
113 * such license, approval or letter.
115 *****************************************************************************/
118 #define __EVXFACE_C__
120 #include <contrib/dev/acpica/acpi.h>
121 #include <contrib/dev/acpica/acnamesp.h>
122 #include <contrib/dev/acpica/acevents.h>
123 #include <contrib/dev/acpica/acinterp.h>
125 #define _COMPONENT ACPI_EVENTS
126 ACPI_MODULE_NAME ("evxface")
129 /*******************************************************************************
131 * FUNCTION: AcpiInstallExceptionHandler
133 * PARAMETERS: Handler - Pointer to the handler function for the
138 * DESCRIPTION: Saves the pointer to the handler function
140 ******************************************************************************/
143 AcpiInstallExceptionHandler (
144 ACPI_EXCEPTION_HANDLER Handler)
149 ACPI_FUNCTION_TRACE (AcpiInstallExceptionHandler);
152 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
153 if (ACPI_FAILURE (Status))
155 return_ACPI_STATUS (Status);
158 /* Don't allow two handlers. */
160 if (AcpiGbl_ExceptionHandler)
162 Status = AE_ALREADY_EXISTS;
166 /* Install the handler */
168 AcpiGbl_ExceptionHandler = Handler;
171 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
172 return_ACPI_STATUS (Status);
175 ACPI_EXPORT_SYMBOL (AcpiInstallExceptionHandler)
178 /*******************************************************************************
180 * FUNCTION: AcpiInstallFixedEventHandler
182 * PARAMETERS: Event - Event type to enable.
183 * Handler - Pointer to the handler function for the
185 * Context - Value passed to the handler on each GPE
189 * DESCRIPTION: Saves the pointer to the handler function and then enables the
192 ******************************************************************************/
195 AcpiInstallFixedEventHandler (
197 ACPI_EVENT_HANDLER Handler,
203 ACPI_FUNCTION_TRACE (AcpiInstallFixedEventHandler);
206 /* Parameter validation */
208 if (Event > ACPI_EVENT_MAX)
210 return_ACPI_STATUS (AE_BAD_PARAMETER);
213 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
214 if (ACPI_FAILURE (Status))
216 return_ACPI_STATUS (Status);
219 /* Don't allow two handlers. */
221 if (NULL != AcpiGbl_FixedEventHandlers[Event].Handler)
223 Status = AE_ALREADY_EXISTS;
227 /* Install the handler before enabling the event */
229 AcpiGbl_FixedEventHandlers[Event].Handler = Handler;
230 AcpiGbl_FixedEventHandlers[Event].Context = Context;
232 Status = AcpiEnableEvent (Event, 0);
233 if (ACPI_FAILURE (Status))
235 ACPI_WARNING ((AE_INFO, "Could not enable fixed event %X", Event));
237 /* Remove the handler */
239 AcpiGbl_FixedEventHandlers[Event].Handler = NULL;
240 AcpiGbl_FixedEventHandlers[Event].Context = NULL;
244 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
245 "Enabled fixed event %X, Handler=%p\n", Event, Handler));
250 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
251 return_ACPI_STATUS (Status);
254 ACPI_EXPORT_SYMBOL (AcpiInstallFixedEventHandler)
257 /*******************************************************************************
259 * FUNCTION: AcpiRemoveFixedEventHandler
261 * PARAMETERS: Event - Event type to disable.
262 * Handler - Address of the handler
266 * DESCRIPTION: Disables the event and unregisters the event handler.
268 ******************************************************************************/
271 AcpiRemoveFixedEventHandler (
273 ACPI_EVENT_HANDLER Handler)
275 ACPI_STATUS Status = AE_OK;
278 ACPI_FUNCTION_TRACE (AcpiRemoveFixedEventHandler);
281 /* Parameter validation */
283 if (Event > ACPI_EVENT_MAX)
285 return_ACPI_STATUS (AE_BAD_PARAMETER);
288 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
289 if (ACPI_FAILURE (Status))
291 return_ACPI_STATUS (Status);
294 /* Disable the event before removing the handler */
296 Status = AcpiDisableEvent (Event, 0);
298 /* Always Remove the handler */
300 AcpiGbl_FixedEventHandlers[Event].Handler = NULL;
301 AcpiGbl_FixedEventHandlers[Event].Context = NULL;
303 if (ACPI_FAILURE (Status))
305 ACPI_WARNING ((AE_INFO,
306 "Could not write to fixed event enable register %X", Event));
310 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Disabled fixed event %X\n", Event));
313 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
314 return_ACPI_STATUS (Status);
317 ACPI_EXPORT_SYMBOL (AcpiRemoveFixedEventHandler)
320 /*******************************************************************************
322 * FUNCTION: AcpiInstallNotifyHandler
324 * PARAMETERS: Device - The device for which notifies will be handled
325 * HandlerType - The type of handler:
326 * ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f)
327 * ACPI_DEVICE_NOTIFY: DriverHandler (80-ff)
328 * ACPI_ALL_NOTIFY: both system and device
329 * Handler - Address of the handler
330 * Context - Value passed to the handler on each GPE
334 * DESCRIPTION: Install a handler for notifies on an ACPI device
336 ******************************************************************************/
339 AcpiInstallNotifyHandler (
342 ACPI_NOTIFY_HANDLER Handler,
345 ACPI_OPERAND_OBJECT *ObjDesc;
346 ACPI_OPERAND_OBJECT *NotifyObj;
347 ACPI_NAMESPACE_NODE *Node;
351 ACPI_FUNCTION_TRACE (AcpiInstallNotifyHandler);
354 /* Parameter validation */
358 (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE))
360 return_ACPI_STATUS (AE_BAD_PARAMETER);
363 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
364 if (ACPI_FAILURE (Status))
366 return_ACPI_STATUS (Status);
369 /* Convert and validate the device handle */
371 Node = AcpiNsMapHandleToNode (Device);
374 Status = AE_BAD_PARAMETER;
380 * Registering a notify handler on the root object indicates that the
381 * caller wishes to receive notifications for all objects. Note that
382 * only one <external> global handler can be regsitered (per notify type).
384 if (Device == ACPI_ROOT_OBJECT)
386 /* Make sure the handler is not already installed */
388 if (((HandlerType & ACPI_SYSTEM_NOTIFY) &&
389 AcpiGbl_SystemNotify.Handler) ||
390 ((HandlerType & ACPI_DEVICE_NOTIFY) &&
391 AcpiGbl_DeviceNotify.Handler))
393 Status = AE_ALREADY_EXISTS;
397 if (HandlerType & ACPI_SYSTEM_NOTIFY)
399 AcpiGbl_SystemNotify.Node = Node;
400 AcpiGbl_SystemNotify.Handler = Handler;
401 AcpiGbl_SystemNotify.Context = Context;
404 if (HandlerType & ACPI_DEVICE_NOTIFY)
406 AcpiGbl_DeviceNotify.Node = Node;
407 AcpiGbl_DeviceNotify.Handler = Handler;
408 AcpiGbl_DeviceNotify.Context = Context;
411 /* Global notify handler installed */
416 * Caller will only receive notifications specific to the target object.
417 * Note that only certain object types can receive notifications.
421 /* Notifies allowed on this object? */
423 if (!AcpiEvIsNotifyObject (Node))
429 /* Check for an existing internal object */
431 ObjDesc = AcpiNsGetAttachedObject (Node);
434 /* Object exists - make sure there's no handler */
436 if (((HandlerType & ACPI_SYSTEM_NOTIFY) &&
437 ObjDesc->CommonNotify.SystemNotify) ||
438 ((HandlerType & ACPI_DEVICE_NOTIFY) &&
439 ObjDesc->CommonNotify.DeviceNotify))
441 Status = AE_ALREADY_EXISTS;
447 /* Create a new object */
449 ObjDesc = AcpiUtCreateInternalObject (Node->Type);
452 Status = AE_NO_MEMORY;
456 /* Attach new object to the Node */
458 Status = AcpiNsAttachObject (Device, ObjDesc, Node->Type);
460 /* Remove local reference to the object */
462 AcpiUtRemoveReference (ObjDesc);
463 if (ACPI_FAILURE (Status))
469 /* Install the handler */
471 NotifyObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_NOTIFY);
474 Status = AE_NO_MEMORY;
478 NotifyObj->Notify.Node = Node;
479 NotifyObj->Notify.Handler = Handler;
480 NotifyObj->Notify.Context = Context;
482 if (HandlerType & ACPI_SYSTEM_NOTIFY)
484 ObjDesc->CommonNotify.SystemNotify = NotifyObj;
487 if (HandlerType & ACPI_DEVICE_NOTIFY)
489 ObjDesc->CommonNotify.DeviceNotify = NotifyObj;
492 if (HandlerType == ACPI_ALL_NOTIFY)
494 /* Extra ref if installed in both */
496 AcpiUtAddReference (NotifyObj);
502 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
503 return_ACPI_STATUS (Status);
506 ACPI_EXPORT_SYMBOL (AcpiInstallNotifyHandler)
509 /*******************************************************************************
511 * FUNCTION: AcpiRemoveNotifyHandler
513 * PARAMETERS: Device - The device for which notifies will be handled
514 * HandlerType - The type of handler:
515 * ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f)
516 * ACPI_DEVICE_NOTIFY: DriverHandler (80-ff)
517 * ACPI_ALL_NOTIFY: both system and device
518 * Handler - Address of the handler
522 * DESCRIPTION: Remove a handler for notifies on an ACPI device
524 ******************************************************************************/
527 AcpiRemoveNotifyHandler (
530 ACPI_NOTIFY_HANDLER Handler)
532 ACPI_OPERAND_OBJECT *NotifyObj;
533 ACPI_OPERAND_OBJECT *ObjDesc;
534 ACPI_NAMESPACE_NODE *Node;
538 ACPI_FUNCTION_TRACE (AcpiRemoveNotifyHandler);
541 /* Parameter validation */
545 (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE))
547 return_ACPI_STATUS (AE_BAD_PARAMETER);
550 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
551 if (ACPI_FAILURE (Status))
553 return_ACPI_STATUS (Status);
556 /* Convert and validate the device handle */
558 Node = AcpiNsMapHandleToNode (Device);
561 Status = AE_BAD_PARAMETER;
567 if (Device == ACPI_ROOT_OBJECT)
569 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
570 "Removing notify handler for namespace root object\n"));
572 if (((HandlerType & ACPI_SYSTEM_NOTIFY) &&
573 !AcpiGbl_SystemNotify.Handler) ||
574 ((HandlerType & ACPI_DEVICE_NOTIFY) &&
575 !AcpiGbl_DeviceNotify.Handler))
577 Status = AE_NOT_EXIST;
581 if (HandlerType & ACPI_SYSTEM_NOTIFY)
583 AcpiGbl_SystemNotify.Node = NULL;
584 AcpiGbl_SystemNotify.Handler = NULL;
585 AcpiGbl_SystemNotify.Context = NULL;
588 if (HandlerType & ACPI_DEVICE_NOTIFY)
590 AcpiGbl_DeviceNotify.Node = NULL;
591 AcpiGbl_DeviceNotify.Handler = NULL;
592 AcpiGbl_DeviceNotify.Context = NULL;
596 /* All Other Objects */
600 /* Notifies allowed on this object? */
602 if (!AcpiEvIsNotifyObject (Node))
608 /* Check for an existing internal object */
610 ObjDesc = AcpiNsGetAttachedObject (Node);
613 Status = AE_NOT_EXIST;
617 /* Object exists - make sure there's an existing handler */
619 if (HandlerType & ACPI_SYSTEM_NOTIFY)
621 NotifyObj = ObjDesc->CommonNotify.SystemNotify;
624 Status = AE_NOT_EXIST;
628 if (NotifyObj->Notify.Handler != Handler)
630 Status = AE_BAD_PARAMETER;
634 /* Remove the handler */
636 ObjDesc->CommonNotify.SystemNotify = NULL;
637 AcpiUtRemoveReference (NotifyObj);
640 if (HandlerType & ACPI_DEVICE_NOTIFY)
642 NotifyObj = ObjDesc->CommonNotify.DeviceNotify;
645 Status = AE_NOT_EXIST;
649 if (NotifyObj->Notify.Handler != Handler)
651 Status = AE_BAD_PARAMETER;
655 /* Remove the handler */
657 ObjDesc->CommonNotify.DeviceNotify = NULL;
658 AcpiUtRemoveReference (NotifyObj);
664 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
665 return_ACPI_STATUS (Status);
668 ACPI_EXPORT_SYMBOL (AcpiRemoveNotifyHandler)
671 /*******************************************************************************
673 * FUNCTION: AcpiInstallGpeHandler
675 * PARAMETERS: GpeDevice - Namespace node for the GPE (NULL for FADT
677 * GpeNumber - The GPE number within the GPE block
678 * Type - Whether this GPE should be treated as an
679 * edge- or level-triggered interrupt.
680 * Address - Address of the handler
681 * Context - Value passed to the handler on each GPE
685 * DESCRIPTION: Install a handler for a General Purpose Event.
687 ******************************************************************************/
690 AcpiInstallGpeHandler (
691 ACPI_HANDLE GpeDevice,
694 ACPI_EVENT_HANDLER Address,
697 ACPI_GPE_EVENT_INFO *GpeEventInfo;
698 ACPI_HANDLER_INFO *Handler;
700 ACPI_CPU_FLAGS Flags;
703 ACPI_FUNCTION_TRACE (AcpiInstallGpeHandler);
706 /* Parameter validation */
708 if ((!Address) || (Type > ACPI_GPE_XRUPT_TYPE_MASK))
710 return_ACPI_STATUS (AE_BAD_PARAMETER);
713 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
714 if (ACPI_FAILURE (Status))
716 return_ACPI_STATUS (Status);
719 /* Ensure that we have a valid GPE number */
721 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
724 Status = AE_BAD_PARAMETER;
728 /* Make sure that there isn't a handler there already */
730 if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) == ACPI_GPE_DISPATCH_HANDLER)
732 Status = AE_ALREADY_EXISTS;
736 /* Allocate and init handler object */
738 Handler = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_HANDLER_INFO));
741 Status = AE_NO_MEMORY;
745 Handler->Address = Address;
746 Handler->Context = Context;
747 Handler->MethodNode = GpeEventInfo->Dispatch.MethodNode;
749 /* Disable the GPE before installing the handler */
751 Status = AcpiEvDisableGpe (GpeEventInfo);
752 if (ACPI_FAILURE (Status))
757 /* Install the handler */
759 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
760 GpeEventInfo->Dispatch.Handler = Handler;
762 /* Setup up dispatch flags to indicate handler (vs. method) */
764 GpeEventInfo->Flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK); /* Clear bits */
765 GpeEventInfo->Flags |= (UINT8) (Type | ACPI_GPE_DISPATCH_HANDLER);
767 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
771 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
772 return_ACPI_STATUS (Status);
775 ACPI_EXPORT_SYMBOL (AcpiInstallGpeHandler)
778 /*******************************************************************************
780 * FUNCTION: AcpiRemoveGpeHandler
782 * PARAMETERS: GpeDevice - Namespace node for the GPE (NULL for FADT
784 * GpeNumber - The event to remove a handler
785 * Address - Address of the handler
789 * DESCRIPTION: Remove a handler for a General Purpose AcpiEvent.
791 ******************************************************************************/
794 AcpiRemoveGpeHandler (
795 ACPI_HANDLE GpeDevice,
797 ACPI_EVENT_HANDLER Address)
799 ACPI_GPE_EVENT_INFO *GpeEventInfo;
800 ACPI_HANDLER_INFO *Handler;
802 ACPI_CPU_FLAGS Flags;
805 ACPI_FUNCTION_TRACE (AcpiRemoveGpeHandler);
808 /* Parameter validation */
812 return_ACPI_STATUS (AE_BAD_PARAMETER);
815 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
816 if (ACPI_FAILURE (Status))
818 return_ACPI_STATUS (Status);
821 /* Ensure that we have a valid GPE number */
823 GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
826 Status = AE_BAD_PARAMETER;
830 /* Make sure that a handler is indeed installed */
832 if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) != ACPI_GPE_DISPATCH_HANDLER)
834 Status = AE_NOT_EXIST;
838 /* Make sure that the installed handler is the same */
840 if (GpeEventInfo->Dispatch.Handler->Address != Address)
842 Status = AE_BAD_PARAMETER;
846 /* Disable the GPE before removing the handler */
848 Status = AcpiEvDisableGpe (GpeEventInfo);
849 if (ACPI_FAILURE (Status))
854 /* Remove the handler */
856 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
857 Handler = GpeEventInfo->Dispatch.Handler;
859 /* Restore Method node (if any), set dispatch flags */
861 GpeEventInfo->Dispatch.MethodNode = Handler->MethodNode;
862 GpeEventInfo->Flags &= ~ACPI_GPE_DISPATCH_MASK; /* Clear bits */
863 if (Handler->MethodNode)
865 GpeEventInfo->Flags |= ACPI_GPE_DISPATCH_METHOD;
867 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
869 /* Now we can free the handler object */
875 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
876 return_ACPI_STATUS (Status);
879 ACPI_EXPORT_SYMBOL (AcpiRemoveGpeHandler)
882 /*******************************************************************************
884 * FUNCTION: AcpiAcquireGlobalLock
886 * PARAMETERS: Timeout - How long the caller is willing to wait
887 * Handle - Where the handle to the lock is returned
892 * DESCRIPTION: Acquire the ACPI Global Lock
894 * Note: Allows callers with the same thread ID to acquire the global lock
895 * multiple times. In other words, externally, the behavior of the global lock
896 * is identical to an AML mutex. On the first acquire, a new handle is
897 * returned. On any subsequent calls to acquire by the same thread, the same
898 * handle is returned.
900 ******************************************************************************/
903 AcpiAcquireGlobalLock (
912 return (AE_BAD_PARAMETER);
915 /* Must lock interpreter to prevent race conditions */
917 AcpiExEnterInterpreter ();
919 Status = AcpiExAcquireMutexObject (Timeout,
920 AcpiGbl_GlobalLockMutex, AcpiOsGetThreadId ());
922 if (ACPI_SUCCESS (Status))
924 /* Return the global lock handle (updated in AcpiEvAcquireGlobalLock) */
926 *Handle = AcpiGbl_GlobalLockHandle;
929 AcpiExExitInterpreter ();
933 ACPI_EXPORT_SYMBOL (AcpiAcquireGlobalLock)
936 /*******************************************************************************
938 * FUNCTION: AcpiReleaseGlobalLock
940 * PARAMETERS: Handle - Returned from AcpiAcquireGlobalLock
944 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
946 ******************************************************************************/
949 AcpiReleaseGlobalLock (
955 if (!Handle || (Handle != AcpiGbl_GlobalLockHandle))
957 return (AE_NOT_ACQUIRED);
960 Status = AcpiExReleaseMutexObject (AcpiGbl_GlobalLockMutex);
964 ACPI_EXPORT_SYMBOL (AcpiReleaseGlobalLock)