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/*++
Copyright (c) 1994 Microsoft Corporation
Module Name:
xxclock.c
Abstract:
This module implements the function necesssary to change the clock
interrupt rate.
Environment:
Kernel mode only.
Revision History:
--*/
/*
* Original source: Build Number 1.612
*
* Modify for R98(MIPS/R4400)
*
***********************************************************************
*
* K001 95.11.24 M.Kusano
* Add for WDT
*/
#include "halp.h"
//
// Define global data used to communicate new clock rates to the clock
// interrupt service routine.
//
ULONG HalpCurrentTimeIncrement;
ULONG HalpNextIntervalCount;
ULONG HalpNextTimeIncrement;
ULONG HalpNewTimeIncrement;
//K001
ULONG HalpStartWDTFlag[R98B_MAX_CPU];
ULONG HalpStopWDTFlag[R98B_MAX_CPU];
ULONG HalpSetWDTFlag[R98B_MAX_CPU];
ULONG HalpSetWDTCount[R98B_MAX_CPU];
VOID
HalStartWDT(
IN ULONG Count
);
VOID
HalStopWDT(
VOID
);
VOID
HalSetWDTCounter(
VOID
);
ULONG
HalSetTimeIncrement (
IN ULONG DesiredIncrement
)
/*++
Routine Description:
This function is called to set the clock interrupt rate to the frequency
required by the specified time increment value.
N.B. This function is only executed on the processor that keeps the
system time.
Arguments:
DesiredIncrement - Supplies desired number of 100ns units between clock
interrupts.
Return Value:
The actual time increment in 100ns units.
--*/
{
ULONG NewTimeIncrement;
ULONG NextIntervalCount;
KIRQL OldIrql;
//
// If the specified time increment value is less that the minimum value
// or greater than the maximum value ,then set the time increment value
// to the minimum or maximum as appropriate.
//
if (DesiredIncrement < MINIMUM_INCREMENT) {
DesiredIncrement = MINIMUM_INCREMENT;
} else if (DesiredIncrement > MAXIMUM_INCREMENT) {
DesiredIncrement = MAXIMUM_INCREMENT;
}
//
// Raise IRQL to the highest level, set the new clock interrupt
// parameters, lower IRQl, and return the new time increment value.
//
// Adjust clock values to the Columbus clock frequency
//
KeRaiseIrql(HIGH_LEVEL, &OldIrql);
NextIntervalCount = ((DesiredIncrement * COLUMBUS_CLOCK_FREQUENCY) / 1000) / 10;
NewTimeIncrement = (NextIntervalCount * 1000 * 10) / COLUMBUS_CLOCK_FREQUENCY;
HalpNextIntervalCount = NextIntervalCount;
HalpNewTimeIncrement = NewTimeIncrement;
KeLowerIrql(OldIrql);
return NewTimeIncrement;
}
//K001
VOID HalStartWDT(
IN ULONG Count
)
/*++
Routine Description:
This function is called to start WDT.
Arguments:
Count - Counter value for WDT.
Return Value:
NONE
--*/
{
ULONG NumCPU,i;
NumCPU=**((PULONG *)(&KeNumberProcessors));
NumCPU--;
for(i=0;i<=NumCPU;i++){
HalpStartWDTFlag[i]=1;
HalpSetWDTCount[i]=Count;
}
}
VOID HalStopWDT(
)
/*++
Routine Description:
This function is called to stop WDT.
Arguments:
NONE
Return Value:
NONE
--*/
{
ULONG NumCPU,i;
NumCPU=**((PULONG *)(&KeNumberProcessors));
NumCPU--;
for(i=0;i<=NumCPU;i++){
HalpStopWDTFlag[i]=1;
}
}
VOID HalSetWDTCounter(
)
/*++
Routine Description:
This function is called to stop WDT.
Arguments:
NONE
Return Value:
NONE
--*/
{
ULONG NumCPU,i;
NumCPU=**((PULONG *)(&KeNumberProcessors));
NumCPU--;
for(i=0;i<=NumCPU;i++){
HalpSetWDTFlag[i]=1;
}
}
|
