172 lines
3.6 KiB
C++
172 lines
3.6 KiB
C++
/*++
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Copyright (c) 1991 - 2002 Microsoft Corporation
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Module Name:
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###### #### ## ## ##### ##### #### ##### #####
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## ## ### ### ## ## ## ## # ## ## ## ##
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## ## ######## ## ## ## ## ## ## ## ##
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## ## # ### ## ##### ##### ## ## ## ## ##
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## ## # # ## ## #### ## ##### #####
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## ## # ## ## ## ## ## ## # ## ##
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## #### # ## ##### ## ## ## #### ## ##
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Abstract:
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This module implements the software watchdog timer
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component. The timer's responsibility is to simply
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ping the hardware timer if it is determined that the
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system is in a healthy state.
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Author:
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Wesley Witt (wesw) 1-Mar-2002
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Environment:
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Kernel mode only.
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Notes:
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--*/
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#include "internal.h"
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VOID
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PingWatchdogTimer(
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IN PDEVICE_EXTENSION DeviceExtension,
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IN BOOLEAN LockResources
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)
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/*++
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Routine Description:
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This function pings the hardware watchdog timer
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device. The ping occurs only if the system
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health is determined to be good.
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Arguments:
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DeviceExtension - Pointer to a device extension object
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LockResources - Specifies whether the hardware resources
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are to be locked for exclusive access.
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Return Value:
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None.
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Notes:
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--*/
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{
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BOOLEAN b;
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KLOCK_QUEUE_HANDLE LockHandle;
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LARGE_INTEGER DueTime;
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ULONG Control;
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b = WdCheckSystemHealth( &DeviceExtension->Health );
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if (b) {
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if (LockResources) {
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KeAcquireInStackQueuedSpinLockAtDpcLevel( &DeviceExtension->DeviceLock, &LockHandle );
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}
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Control = READ_REGISTER_ULONG( DeviceExtension->ControlRegisterAddress );
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SETBITS( Control, WATCHDOG_CONTROL_TRIGGER );
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WRITE_REGISTER_ULONG( DeviceExtension->ControlRegisterAddress, Control );
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if (LockResources) {
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KeReleaseInStackQueuedSpinLockFromDpcLevel( &LockHandle );
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}
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DueTime.QuadPart = -((LONGLONG)DeviceExtension->DpcTimeout);
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KeSetTimer( &DeviceExtension->Timer, DueTime, &DeviceExtension->TimerDpc );
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}
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}
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VOID
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WdTimerDpc(
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IN PKDPC Dpc,
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IN PVOID DeferredContext,
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IN PVOID SystemArgument1,
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IN PVOID SystemArgument2
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)
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/*++
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Routine Description:
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This is the function is called when the DPC timer
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expires. The hardware timer is simply pinged at
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this time.
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Arguments:
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Dpc - Pointer to the kernel DPC object
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DeferredContext - Really a device extension
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SystemArgument1 - unused
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SystemArgument2 - unused
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Return Value:
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None.
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Notes:
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--*/
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{
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PDEVICE_EXTENSION DeviceExtension = (PDEVICE_EXTENSION)DeferredContext;
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PingWatchdogTimer( DeviceExtension, TRUE );
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}
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NTSTATUS
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WdInitializeSoftwareTimer(
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PDEVICE_EXTENSION DeviceExtension
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)
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/*++
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Routine Description:
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This function initializes the software DPC timer.
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Arguments:
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DeviceExtension - Pointer to a device extension object
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Return Value:
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If we successfully create a device object, STATUS_SUCCESS is
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returned. Otherwise, return the appropriate error code.
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Notes:
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--*/
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{
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DeviceExtension->DpcTimeout = ConvertTimeoutToMilliseconds(
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WdTable->Units, DeviceExtension->HardwareTimeout >> 2 ) * 10000;
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WdInitializeSystemHealth( &DeviceExtension->Health );
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KeInitializeTimer( &DeviceExtension->Timer );
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KeInitializeDpc( &DeviceExtension->TimerDpc, WdTimerDpc, DeviceExtension );
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PingWatchdogTimer( DeviceExtension, FALSE );
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return STATUS_SUCCESS;
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}
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