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 /******************************************************************************
  *
  * Module Name: evmisc - Miscellaneous event manager support functions
  *
  *****************************************************************************/
 
 /******************************************************************************
  *
  * 1. Copyright Notice
  *
  * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp.
  * All rights reserved.
  *
  * 2. License
  *
  * 2.1. This is your license from Intel Corp. under its intellectual property
  * rights.  You may have additional license terms from the party that provided
  * you this software, covering your right to use that party's intellectual
  * property rights.
  *
  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  * copy of the source code appearing in this file ("Covered Code") an
  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  * base code distributed originally by Intel ("Original Intel Code") to copy,
  * make derivatives, distribute, use and display any portion of the Covered
  * Code in any form, with the right to sublicense such rights; and
  *
  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  * license (with the right to sublicense), under only those claims of Intel
  * patents that are infringed by the Original Intel Code, to make, use, sell,
  * offer to sell, and import the Covered Code and derivative works thereof
  * solely to the minimum extent necessary to exercise the above copyright
  * license, and in no event shall the patent license extend to any additions
  * to or modifications of the Original Intel Code.  No other license or right
  * is granted directly or by implication, estoppel or otherwise;
  *
  * The above copyright and patent license is granted only if the following
  * conditions are met:
  *
  * 3. Conditions
  *
  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification with rights to further distribute source must include
  * the above Copyright Notice, the above License, this list of Conditions,
  * and the following Disclaimer and Export Compliance provision.  In addition,
  * Licensee must cause all Covered Code to which Licensee contributes to
  * contain a file documenting the changes Licensee made to create that Covered
  * Code and the date of any change.  Licensee must include in that file the
  * documentation of any changes made by any predecessor Licensee.  Licensee
  * must include a prominent statement that the modification is derived,
  * directly or indirectly, from Original Intel Code.
  *
  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification without rights to further distribute source must
  * include the following Disclaimer and Export Compliance provision in the
  * documentation and/or other materials provided with distribution.  In
  * addition, Licensee may not authorize further sublicense of source of any
  * portion of the Covered Code, and must include terms to the effect that the
  * license from Licensee to its licensee is limited to the intellectual
  * property embodied in the software Licensee provides to its licensee, and
  * not to intellectual property embodied in modifications its licensee may
  * make.
  *
  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  * substantial portion of the Covered Code or modification must reproduce the
  * above Copyright Notice, and the following Disclaimer and Export Compliance
  * provision in the documentation and/or other materials provided with the
  * distribution.
  *
  * 3.4. Intel retains all right, title, and interest in and to the Original
  * Intel Code.
  *
  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  * Intel shall be used in advertising or otherwise to promote the sale, use or
  * other dealings in products derived from or relating to the Covered Code
  * without prior written authorization from Intel.
  *
  * 4. Disclaimer and Export Compliance
  *
  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  * PARTICULAR PURPOSE.
  *
  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  * LIMITED REMEDY.
  *
  * 4.3. Licensee shall not export, either directly or indirectly, any of this
  * software or system incorporating such software without first obtaining any
  * required license or other approval from the U. S. Department of Commerce or
  * any other agency or department of the United States Government.  In the
  * event Licensee exports any such software from the United States or
  * re-exports any such software from a foreign destination, Licensee shall
  * ensure that the distribution and export/re-export of the software is in
  * compliance with all laws, regulations, orders, or other restrictions of the
  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
  * any of its subsidiaries will export/re-export any technical data, process,
  * software, or service, directly or indirectly, to any country for which the
  * United States government or any agency thereof requires an export license,
  * other governmental approval, or letter of assurance, without first obtaining
  * such license, approval or letter.
  *
  *****************************************************************************/
 
 #include "acpi.h"
 #include "accommon.h"
 #include "acevents.h"
 #include "acnamesp.h"
 #include "acinterp.h"
 
 #define _COMPONENT          ACPI_EVENTS
         ACPI_MODULE_NAME    ("evmisc")
 
 
 /* Local prototypes */
 
 static void ACPI_SYSTEM_XFACE
 AcpiEvNotifyDispatch (
     void                    *Context);
 
 static UINT32
 AcpiEvGlobalLockHandler (
     void                    *Context);
 
 static ACPI_STATUS
 AcpiEvRemoveGlobalLockHandler (
     void);
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiEvIsNotifyObject
  *
  * PARAMETERS:  Node            - Node to check
  *
  * RETURN:      TRUE if notifies allowed on this object
  *
  * DESCRIPTION: Check type of node for a object that supports notifies.
  *
  *              TBD: This could be replaced by a flag bit in the node.
  *
  ******************************************************************************/
 
 BOOLEAN
 AcpiEvIsNotifyObject (
     ACPI_NAMESPACE_NODE     *Node)
 {
     switch (Node->Type)
     {
     case ACPI_TYPE_DEVICE:
     case ACPI_TYPE_PROCESSOR:
     case ACPI_TYPE_THERMAL:
         /*
          * These are the ONLY objects that can receive ACPI notifications
          */
         return (TRUE);
 
     default:
         return (FALSE);
     }
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiEvQueueNotifyRequest
  *
  * PARAMETERS:  Node            - NS node for the notified object
  *              NotifyValue     - Value from the Notify() request
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Dispatch a device notification event to a previously
  *              installed handler.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiEvQueueNotifyRequest (
     ACPI_NAMESPACE_NODE     *Node,
     UINT32                  NotifyValue)
 {
     ACPI_OPERAND_OBJECT     *ObjDesc;
     ACPI_OPERAND_OBJECT     *HandlerObj = NULL;
     ACPI_GENERIC_STATE      *NotifyInfo;
     ACPI_STATUS             Status = AE_OK;
 
 
     ACPI_FUNCTION_NAME (EvQueueNotifyRequest);
 
 
     /*
      * For value 3 (Ejection Request), some device method may need to be run.
      * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need
      *   to be run.
      * For value 0x80 (Status Change) on the power button or sleep button,
      *   initiate soft-off or sleep operation?
      */
     ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
         "Dispatching Notify on [%4.4s] Node %p Value 0x%2.2X (%s)\n",
         AcpiUtGetNodeName (Node), Node, NotifyValue,
         AcpiUtGetNotifyName (NotifyValue)));
 
     /* Get the notify object attached to the NS Node */
 
     ObjDesc = AcpiNsGetAttachedObject (Node);
     if (ObjDesc)
     {
         /* We have the notify object, Get the right handler */
 
         switch (Node->Type)
         {
         /* Notify allowed only on these types */
 
         case ACPI_TYPE_DEVICE:
         case ACPI_TYPE_THERMAL:
         case ACPI_TYPE_PROCESSOR:
 
             if (NotifyValue <= ACPI_MAX_SYS_NOTIFY)
             {
                 HandlerObj = ObjDesc->CommonNotify.SystemNotify;
             }
             else
             {
                 HandlerObj = ObjDesc->CommonNotify.DeviceNotify;
             }
             break;
 
         default:
 
             /* All other types are not supported */
 
             return (AE_TYPE);
         }
     }
 
     /*
      * If there is any handler to run, schedule the dispatcher.
      * Check for:
      * 1) Global system notify handler
      * 2) Global device notify handler
      * 3) Per-device notify handler
      */
     if ((AcpiGbl_SystemNotify.Handler &&
             (NotifyValue <= ACPI_MAX_SYS_NOTIFY)) ||
         (AcpiGbl_DeviceNotify.Handler &&
             (NotifyValue > ACPI_MAX_SYS_NOTIFY))  ||
         HandlerObj)
     {
         NotifyInfo = AcpiUtCreateGenericState ();
         if (!NotifyInfo)
         {
             return (AE_NO_MEMORY);
         }
 
         if (!HandlerObj)
         {
             ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
                 "Executing system notify handler for Notify (%4.4s, %X) "
                 "node %p\n",
                 AcpiUtGetNodeName (Node), NotifyValue, Node));
         }
 
         NotifyInfo->Common.DescriptorType = ACPI_DESC_TYPE_STATE_NOTIFY;
         NotifyInfo->Notify.Node = Node;
         NotifyInfo->Notify.Value = (UINT16) NotifyValue;
         NotifyInfo->Notify.HandlerObj = HandlerObj;
 
         Status = AcpiOsExecute (
                     OSL_NOTIFY_HANDLER, AcpiEvNotifyDispatch, NotifyInfo);
         if (ACPI_FAILURE (Status))
         {
             AcpiUtDeleteGenericState (NotifyInfo);
         }
     }
     else
     {
         /* There is no notify handler (per-device or system) for this device */
 
         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
             "No notify handler for Notify (%4.4s, %X) node %p\n",
             AcpiUtGetNodeName (Node), NotifyValue, Node));
     }
 
     return (Status);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiEvNotifyDispatch
  *
  * PARAMETERS:  Context         - To be passed to the notify handler
  *
  * RETURN:      None.
  *
  * DESCRIPTION: Dispatch a device notification event to a previously
  *              installed handler.
  *
  ******************************************************************************/
 
 static void ACPI_SYSTEM_XFACE
 AcpiEvNotifyDispatch (
     void                    *Context)
 {
     ACPI_GENERIC_STATE      *NotifyInfo = (ACPI_GENERIC_STATE *) Context;
     ACPI_NOTIFY_HANDLER     GlobalHandler = NULL;
     void                    *GlobalContext = NULL;
     ACPI_OPERAND_OBJECT     *HandlerObj;
 
 
     ACPI_FUNCTION_ENTRY ();
 
 
     /*
      * We will invoke a global notify handler if installed. This is done
      * _before_ we invoke the per-device handler attached to the device.
      */
     if (NotifyInfo->Notify.Value <= ACPI_MAX_SYS_NOTIFY)
     {
         /* Global system notification handler */
 
         if (AcpiGbl_SystemNotify.Handler)
         {
             GlobalHandler = AcpiGbl_SystemNotify.Handler;
             GlobalContext = AcpiGbl_SystemNotify.Context;
         }
     }
     else
     {
         /* Global driver notification handler */
 
         if (AcpiGbl_DeviceNotify.Handler)
         {
             GlobalHandler = AcpiGbl_DeviceNotify.Handler;
             GlobalContext = AcpiGbl_DeviceNotify.Context;
         }
     }
 
     /* Invoke the system handler first, if present */
 
     if (GlobalHandler)
     {
         GlobalHandler (NotifyInfo->Notify.Node, NotifyInfo->Notify.Value,
             GlobalContext);
     }
 
     /* Now invoke the per-device handler, if present */
 
     HandlerObj = NotifyInfo->Notify.HandlerObj;
     if (HandlerObj)
     {
         HandlerObj->Notify.Handler (NotifyInfo->Notify.Node,
             NotifyInfo->Notify.Value,
             HandlerObj->Notify.Context);
     }
 
     /* All done with the info object */
 
     AcpiUtDeleteGenericState (NotifyInfo);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiEvGlobalLockHandler
  *
  * PARAMETERS:  Context         - From thread interface, not used
  *
  * RETURN:      ACPI_INTERRUPT_HANDLED
  *
  * DESCRIPTION: Invoked directly from the SCI handler when a global lock
  *              release interrupt occurs. Attempt to acquire the global lock,
  *              if successful, signal the thread waiting for the lock.
  *
  * NOTE: Assumes that the semaphore can be signaled from interrupt level. If
  * this is not possible for some reason, a separate thread will have to be
  * scheduled to do this.
  *
  ******************************************************************************/
 
 static UINT32
 AcpiEvGlobalLockHandler (
     void                    *Context)
 {
     BOOLEAN                 Acquired = FALSE;
     ACPI_STATUS             Status;
 
 
     /*
      * Attempt to get the lock.
      *
      * If we don't get it now, it will be marked pending and we will
      * take another interrupt when it becomes free.
      */
     ACPI_ACQUIRE_GLOBAL_LOCK (AcpiGbl_FACS, Acquired);
     if (Acquired)
     {
         /* Got the lock, now wake the thread waiting for it */
 
         AcpiGbl_GlobalLockAcquired = TRUE;
 
         /* Send a unit to the semaphore */
 
         Status = AcpiOsSignalSemaphore (AcpiGbl_GlobalLockSemaphore, 1);
         if (ACPI_FAILURE (Status))
         {
             ACPI_ERROR ((AE_INFO, "Could not signal Global Lock semaphore"));
         }
     }
 
     return (ACPI_INTERRUPT_HANDLED);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiEvInitGlobalLockHandler
  *
  * PARAMETERS:  None
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Install a handler for the global lock release event
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiEvInitGlobalLockHandler (
     void)
 {
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_TRACE (EvInitGlobalLockHandler);
 
 
     /* Attempt installation of the global lock handler */
 
     Status = AcpiInstallFixedEventHandler (ACPI_EVENT_GLOBAL,
                 AcpiEvGlobalLockHandler, NULL);
 
     /*
      * If the global lock does not exist on this platform, the attempt to
      * enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick).
      * Map to AE_OK, but mark global lock as not present. Any attempt to
      * actually use the global lock will be flagged with an error.
      */
     if (Status == AE_NO_HARDWARE_RESPONSE)
     {
         ACPI_ERROR ((AE_INFO,
             "No response from Global Lock hardware, disabling lock"));
 
         AcpiGbl_GlobalLockPresent = FALSE;
         return_ACPI_STATUS (AE_OK);
     }
 
     AcpiGbl_GlobalLockPresent = TRUE;
     return_ACPI_STATUS (Status);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiEvRemoveGlobalLockHandler
  *
  * PARAMETERS:  None
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Remove the handler for the Global Lock
  *
  ******************************************************************************/
 
 static ACPI_STATUS
 AcpiEvRemoveGlobalLockHandler (
     void)
 {
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_TRACE (EvRemoveGlobalLockHandler);
 
     AcpiGbl_GlobalLockPresent = FALSE;
     Status = AcpiRemoveFixedEventHandler (ACPI_EVENT_GLOBAL,
                 AcpiEvGlobalLockHandler);
 
     return_ACPI_STATUS (Status);
 }
 
 
 /******************************************************************************
  *
  * FUNCTION:    AcpiEvAcquireGlobalLock
  *
  * PARAMETERS:  Timeout         - Max time to wait for the lock, in millisec.
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Attempt to gain ownership of the Global Lock.
  *
  * MUTEX:       Interpreter must be locked
  *
  * Note: The original implementation allowed multiple threads to "acquire" the
  * Global Lock, and the OS would hold the lock until the last thread had
  * released it. However, this could potentially starve the BIOS out of the
  * lock, especially in the case where there is a tight handshake between the
  * Embedded Controller driver and the BIOS. Therefore, this implementation
  * allows only one thread to acquire the HW Global Lock at a time, and makes
  * the global lock appear as a standard mutex on the OS side.
  *
  *****************************************************************************/
 
 ACPI_STATUS
 AcpiEvAcquireGlobalLock (
     UINT16                  Timeout)
 {
     ACPI_STATUS             Status = AE_OK;
     BOOLEAN                 Acquired = FALSE;
 
 
     ACPI_FUNCTION_TRACE (EvAcquireGlobalLock);
 
 
     /*
      * Only one thread can acquire the GL at a time, the GlobalLockMutex
      * enforces this. This interface releases the interpreter if we must wait.
      */
     Status = AcpiExSystemWaitMutex (AcpiGbl_GlobalLockMutex->Mutex.OsMutex,
                 Timeout);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     /*
      * Update the global lock handle and check for wraparound. The handle is
      * only used for the external global lock interfaces, but it is updated
      * here to properly handle the case where a single thread may acquire the
      * lock via both the AML and the AcpiAcquireGlobalLock interfaces. The
      * handle is therefore updated on the first acquire from a given thread
      * regardless of where the acquisition request originated.
      */
     AcpiGbl_GlobalLockHandle++;
     if (AcpiGbl_GlobalLockHandle == 0)
     {
         AcpiGbl_GlobalLockHandle = 1;
     }
 
     /*
      * Make sure that a global lock actually exists. If not, just treat the
      * lock as a standard mutex.
      */
     if (!AcpiGbl_GlobalLockPresent)
     {
         AcpiGbl_GlobalLockAcquired = TRUE;
         return_ACPI_STATUS (AE_OK);
     }
 
     /* Attempt to acquire the actual hardware lock */
 
     ACPI_ACQUIRE_GLOBAL_LOCK (AcpiGbl_FACS, Acquired);
     if (Acquired)
     {
        /* We got the lock */
 
         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Acquired hardware Global Lock\n"));
 
         AcpiGbl_GlobalLockAcquired = TRUE;
         return_ACPI_STATUS (AE_OK);
     }
 
     /*
      * Did not get the lock. The pending bit was set above, and we must now
      * wait until we get the global lock released interrupt.
      */
     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Waiting for hardware Global Lock\n"));
 
     /*
      * Wait for handshake with the global lock interrupt handler.
      * This interface releases the interpreter if we must wait.
      */
     Status = AcpiExSystemWaitSemaphore (AcpiGbl_GlobalLockSemaphore,
                 ACPI_WAIT_FOREVER);
 
     return_ACPI_STATUS (Status);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiEvReleaseGlobalLock
  *
  * PARAMETERS:  None
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Releases ownership of the Global Lock.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiEvReleaseGlobalLock (
     void)
 {
     BOOLEAN                 Pending = FALSE;
     ACPI_STATUS             Status = AE_OK;
 
 
     ACPI_FUNCTION_TRACE (EvReleaseGlobalLock);
 
 
     /* Lock must be already acquired */
 
     if (!AcpiGbl_GlobalLockAcquired)
     {
         ACPI_WARNING ((AE_INFO,
             "Cannot release the ACPI Global Lock, it has not been acquired"));
         return_ACPI_STATUS (AE_NOT_ACQUIRED);
     }
 
     if (AcpiGbl_GlobalLockPresent)
     {
         /* Allow any thread to release the lock */
 
         ACPI_RELEASE_GLOBAL_LOCK (AcpiGbl_FACS, Pending);
 
         /*
          * If the pending bit was set, we must write GBL_RLS to the control
          * register
          */
         if (Pending)
         {
             Status = AcpiWriteBitRegister (
                         ACPI_BITREG_GLOBAL_LOCK_RELEASE, ACPI_ENABLE_EVENT);
         }
 
         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Released hardware Global Lock\n"));
     }
 
     AcpiGbl_GlobalLockAcquired = FALSE;
 
     /* Release the local GL mutex */
 
     AcpiOsReleaseMutex (AcpiGbl_GlobalLockMutex->Mutex.OsMutex);
     return_ACPI_STATUS (Status);
 }
 
 
 /******************************************************************************
  *
  * FUNCTION:    AcpiEvTerminate
  *
  * PARAMETERS:  none
  *
  * RETURN:      none
  *
  * DESCRIPTION: Disable events and free memory allocated for table storage.
  *
  ******************************************************************************/
 
 void
 AcpiEvTerminate (
     void)
 {
     UINT32                  i;
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_TRACE (EvTerminate);
 
 
     if (AcpiGbl_EventsInitialized)
     {
         /*
          * Disable all event-related functionality. In all cases, on error,
          * print a message but obviously we don't abort.
          */
 
         /* Disable all fixed events */
 
         for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++)
         {
             Status = AcpiDisableEvent (i, 0);
             if (ACPI_FAILURE (Status))
             {
                 ACPI_ERROR ((AE_INFO,
                     "Could not disable fixed event %d", (UINT32) i));
             }
         }
 
         /* Disable all GPEs in all GPE blocks */
 
         Status = AcpiEvWalkGpeList (AcpiHwDisableGpeBlock, NULL);
 
         /* Remove SCI handler */
 
         Status = AcpiEvRemoveSciHandler ();
         if (ACPI_FAILURE(Status))
         {
             ACPI_ERROR ((AE_INFO,
                 "Could not remove SCI handler"));
         }
 
         Status = AcpiEvRemoveGlobalLockHandler ();
         if (ACPI_FAILURE(Status))
         {
             ACPI_ERROR ((AE_INFO,
                 "Could not remove Global Lock handler"));
         }
     }
 
     /* Deallocate all handler objects installed within GPE info structs */
 
     Status = AcpiEvWalkGpeList (AcpiEvDeleteGpeHandlers, NULL);
 
     /* Return to original mode if necessary */
 
     if (AcpiGbl_OriginalMode == ACPI_SYS_MODE_LEGACY)
     {
         Status = AcpiDisable ();
         if (ACPI_FAILURE (Status))
         {
             ACPI_WARNING ((AE_INFO, "AcpiDisable failed"));
         }
     }
     return_VOID;
 }