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92 lines
2.1 KiB
C
Executable file
92 lines
2.1 KiB
C
Executable file
/*
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* PROJECT: ReactOS Boot Loader
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* LICENSE: BSD - See COPYING.ARM in the top level directory
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* FILE: boot/armllb/hw/time.c
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* PURPOSE: LLB Time Routines
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* PROGRAMMERS: ReactOS Portable Systems Group
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*/
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#include "precomp.h"
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#define LEAPS_THRU_END_OF(y) ((y)/4 - (y)/100 + (y)/400)
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UCHAR LlbDaysInMonth[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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TIMEINFO LlbTime;
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BOOLEAN
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NTAPI
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LlbIsLeapYear(IN ULONG Year)
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{
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/* Every 4, 100, or 400 years */
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return (!(Year % 4) && (Year % 100)) || !(Year % 400);
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}
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ULONG
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NTAPI
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LlbDayOfMonth(IN ULONG Month,
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IN ULONG Year)
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{
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/* Check how many days a month has, accounting for leap yearS */
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return LlbDaysInMonth[Month] + (LlbIsLeapYear(Year) && Month == 1);
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}
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VOID
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NTAPI
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LlbConvertRtcTime(IN ULONG RtcTime,
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OUT TIMEINFO* TimeInfo)
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{
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ULONG Month, Year, Days, DaysLeft;
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/* Count the days, keep the minutes */
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Days = RtcTime / 86400;
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RtcTime -= Days * 86400;
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/* Get the year, based on days since 1970 */
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Year = 1970 + Days / 365;
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/* Account for leap years which changed the number of days/year */
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Days -= (Year - 1970) * 365 + LEAPS_THRU_END_OF(Year - 1) - LEAPS_THRU_END_OF(1970 - 1);
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if (Days < 0)
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{
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/* We hit a leap year, so fixup the math */
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Year--;
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Days += 365 + LlbIsLeapYear(Year);
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}
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/* Count months */
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for (Month = 0; Month < 11; Month++)
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{
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/* How many days in this month? */
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DaysLeft = Days - LlbDayOfMonth(Month, Year);
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if (DaysLeft < 0) break;
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/* How many days left total? */
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Days = DaysLeft;
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}
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/* Write the structure */
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TimeInfo->Year = Year;
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TimeInfo->Day = Days + 1;
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TimeInfo->Month = Month + 1;
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TimeInfo->Hour = RtcTime / 3600;
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RtcTime -= TimeInfo->Hour * 3600;
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TimeInfo->Minute = RtcTime / 60;
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TimeInfo->Second = RtcTime - TimeInfo->Minute * 60;
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}
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TIMEINFO*
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NTAPI
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LlbGetTime(VOID)
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{
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ULONG RtcTime;
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/* Read RTC time */
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RtcTime = LlbHwRtcRead();
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/* Convert it */
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LlbConvertRtcTime(RtcTime, &LlbTime);
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return &LlbTime;
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}
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/* EOF */
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