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/*++
Copyright (c) 1991 Microsoft Corporation
Module Name:
fwtime.c
Abstract:
This module implements the ARC firmware time operations.
Author:
David M. Robinson (davidro) 19-Aug-1991
Revision History:
--*/
#include "fwp.h"
#include "jxhalp.h"
//
// Static data.
//
TIME_FIELDS FwTime;
ULONG Seconds;
ULONG FwDays;
//
// Define global data used to locate the EISA control space and the realtime
// clock registers.
//
PVOID HalpEisaControlBase;
PVOID HalpRealTimeClockBase;
ARC_STATUS
FwTimeInitialize (
VOID
)
/*++
Routine Description:
This routine initializes the time routine addresses.
Arguments:
None.
Return Value:
ESUCCESS is returned.
--*/
{
//
// Initialize the time routine addresses in the system
// parameter block.
//
(PARC_GET_TIME_ROUTINE)SYSTEM_BLOCK->FirmwareVector[GetTimeRoutine] =
FwGetTime;
(PARC_GET_RELATIVE_TIME_ROUTINE)SYSTEM_BLOCK->FirmwareVector[GetRelativeTimeRoutine] =
FwGetRelativeTime;
//
// Initialize pointers that the HAL routines use to access the RTC. Note
// that these routines are linked with the firmware and so this does not
// affect the actual HAL.
//
HalpEisaControlBase = (PVOID)EISA_IO_VIRTUAL_BASE;
HalpRealTimeClockBase = (PVOID)RTC_VIRTUAL_BASE;
//
// Initialize static data.
//
Seconds = 0;
FwDays = 0;
return ESUCCESS;
}
PTIME_FIELDS
FwGetTime (
VOID
)
/*++
Routine Description:
This routine returns a time structure filled in with the current
time read from the RTC.
Arguments:
None.
Return Value:
Returns a pointer to a time structure. If the time information is
valid, valid data is returned, otherwise all fields are returned as zero.
--*/
{
if (!HalQueryRealTimeClock(&FwTime)) {
FwTime.Year = 0;
FwTime.Month = 0;
FwTime.Day = 0;
FwTime.Hour = 0;
FwTime.Minute = 0;
FwTime.Second = 0;
FwTime.Milliseconds = 0;
FwTime.Weekday = 0;
}
return &FwTime;
}
ULONG
FwGetRelativeTime (
VOID
)
/*++
Routine Description:
This routine returns a ULONG which increases at a rate of one per second.
This routine must be called at least once per day for the number to maintain
an accurate count.
Arguments:
None.
Return Value:
Returns a pointer to a ULONG. If the time information is valid, valid
data is returned, otherwise a zero is returned.
--*/
{
TIME_FIELDS Time;
ULONG TempTime;
TempTime = Seconds;
if (HalQueryRealTimeClock(&Time)) {
Seconds = ((FwDays * 24 + Time.Hour) * 60 + Time.Minute) * 60 + Time.Second;
if (Seconds < TempTime) {
FwDays++;
Seconds += 24 * 60 * 60;
}
} else {
Seconds = 0;
}
return Seconds;
}
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