pc98rtc.c File Reference

#include <freeldr.h>

Include dependency graph for pc98rtc.c:

Go to the source code of this file.

Functions
static UCHAR	BCD_INT (_In_ UCHAR Bcd)
TIMEINFO *	Pc98GetTime (VOID)

Function Documentation

BCD_INT()

static UCHAR BCD_INT ( _In_ UCHAR  Bcd )

static

Definition at line 12 of file pc98rtc.c.

{
    return ((Bcd & 0xF0) >> 4) * 10 + (Bcd & 0x0F);
}

Referenced by Pc98GetTime().

Pc98GetTime()

TIMEINFO * Pc98GetTime

(

VOID

)

Definition at line 19 of file pc98rtc.c.

{
    static TIMEINFO TimeInfo;
    REGS Regs;
    UCHAR SysTime[6];
 
    /* Int 1Ch AH=00h
     * TIMER BIOS - Read system time
     *
     * Call with:
     * ES:BX -> data buffer
     */
    Regs.b.ah = 0x00;
    Regs.w.es = ((ULONG_PTR)SysTime) >> 4;
    Regs.w.bx = ((ULONG_PTR)SysTime) & 0x0F;
    Int386(0x1C, &Regs, &Regs);
 
    TimeInfo.Year = BCD_INT(SysTime[0]);
    TimeInfo.Month = BCD_INT(SysTime[1] >> 4);
    TimeInfo.Day = BCD_INT(SysTime[2]);
    TimeInfo.Hour = BCD_INT(SysTime[3]);
    TimeInfo.Minute = BCD_INT(SysTime[4]);
    TimeInfo.Second = BCD_INT(SysTime[5]);
    if (TimeInfo.Year >= 80)
        TimeInfo.Year += 1900;
    else
        TimeInfo.Year += 2000;
 
    return &TimeInfo;
}

Referenced by MachInit().