216 lines
4.1 KiB
C
216 lines
4.1 KiB
C
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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xxtimer.c
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Abstract:
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This module contains the HAL's timer-related APIs
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Author:
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Eric Nelson (enelson) July 6, 2000
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Revision History:
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--*/
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#include "halp.h"
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#include "xxtimer.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(INIT, HalpSetTimerFunctions)
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#endif
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//
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// External function prototypes
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//
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ULONG
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HalpAcpiTimerSetTimeIncrement(
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IN ULONG DesiredIncrement
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);
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VOID
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HalpAcpiTimerStallExecProc(
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IN ULONG MicroSeconds
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);
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VOID
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HalpAcpiTimerCalibratePerfCount(
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IN LONG volatile *Number,
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IN ULONGLONG NewCount
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);
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VOID
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HalpPmTimerCalibratePerfCount(
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IN LONG volatile *Number,
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IN ULONGLONG NewCount
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);
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LARGE_INTEGER
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HalpAcpiTimerQueryPerfCount(
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OUT PLARGE_INTEGER PerformanceFrequency OPTIONAL
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);
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LARGE_INTEGER
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HalpPmTimerQueryPerfCount(
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OUT PLARGE_INTEGER PerformanceFrequency OPTIONAL
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);
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//
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// Local variables
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//
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static TIMER_FUNCTIONS HalpTimerFunctions = { HalpAcpiTimerStallExecProc,
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#ifdef NO_PM_KEQPC
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HalpAcpiTimerCalibratePerfCount,
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HalpAcpiTimerQueryPerfCount,
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#else
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HalpPmTimerCalibratePerfCount,
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HalpPmTimerQueryPerfCount,
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#endif
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HalpAcpiTimerSetTimeIncrement };
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VOID
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HalpSetTimerFunctions(
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IN PTIMER_FUNCTIONS TimerFunctions
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)
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/*++
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Routine Description:
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This routine can be used to override the HALs ACPI-timer functions with
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multimedia event timer functions
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Arguments:
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TimerFunctions - Pointer to a table of timer functions
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Return Value:
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None
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--*/
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{
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HalpTimerFunctions = *TimerFunctions;
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#if 1
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HalpTimerFunctions.SetTimeIncrement = HalpAcpiTimerSetTimeIncrement;
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#endif
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}
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ULONG
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HalSetTimeIncrement(
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IN ULONG DesiredIncrement
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)
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/*++
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Routine Description:
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This routine initialize system time clock to generate an
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interrupt at every DesiredIncrement interval
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Arguments:
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DesiredIncrement - Desired interval between every timer tick (in
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100ns unit)
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Return Value:
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The *REAL* time increment set
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--*/
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{
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return (HalpTimerFunctions.SetTimeIncrement)(DesiredIncrement);
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}
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VOID
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HalCalibratePerformanceCounter(
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IN LONG volatile *Number,
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IN ULONGLONG NewCount
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)
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/*++
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Routine Description:
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This routine resets the performance counter value for the current
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processor to zero, the reset is done such that the resulting value
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is closely synchronized with other processors in the configuration
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Arguments:
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Number - Supplies a pointer to count of the number of processors in
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the configuration
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NewCount - Supplies the value to synchronize the counter too
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Return Value:
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None
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--*/
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{
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(HalpTimerFunctions.CalibratePerfCount)(Number, NewCount);
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}
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LARGE_INTEGER
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KeQueryPerformanceCounter(
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OUT PLARGE_INTEGER PerformanceFrequency OPTIONAL
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)
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/*++
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Routine Description:
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This routine returns current 64-bit performance counter and,
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optionally, the Performance Frequency
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N.B. The performace counter returned by this routine is
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not necessary the value when this routine is just entered,
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The value returned is actually the counter value at any point
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between the routine is entered and is exited
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Arguments:
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PerformanceFrequency - optionally, supplies the address of a
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variable to receive the performance counter
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frequency
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Return Value:
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Current value of the performance counter will be returned
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--*/
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{
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return (HalpTimerFunctions.QueryPerfCount)(PerformanceFrequency);
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}
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VOID
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KeStallExecutionProcessor(
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IN ULONG MicroSeconds
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)
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/*++
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Routine Description:
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This function stalls execution for the specified number of microseconds
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Arguments:
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MicroSeconds - Supplies the number of microseconds that execution is to be
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stalled
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Return Value:
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None
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--*/
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{
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(HalpTimerFunctions.StallExecProc)(MicroSeconds);
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}
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