xboxrtc.c

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/*
 *  FreeLoader
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#include <freeldr.h>
 
#define RTC_REGISTER_A   0x0A
#define   RTC_REG_A_UIP  0x80  /* Update In Progress bit */
 
static
UCHAR
BCD_INT(
    _In_ UCHAR Bcd)
{
    return ((Bcd & 0xF0) >> 4) * 10 + (Bcd & 0x0F);
}
 
static UCHAR
HalpQueryCMOS(UCHAR Reg)
{
  UCHAR Val;
  Reg |= 0x80;
 
  WRITE_PORT_UCHAR((PUCHAR)0x70, Reg);
  Val = READ_PORT_UCHAR((PUCHAR)0x71);
  WRITE_PORT_UCHAR((PUCHAR)0x70, 0);
 
  return(Val);
}
 
TIMEINFO*
XboxGetTime(VOID)
{
    static TIMEINFO TimeInfo;
 
    while (HalpQueryCMOS (RTC_REGISTER_A) & RTC_REG_A_UIP)
    {
        ;
    }
 
    TimeInfo.Second = BCD_INT(HalpQueryCMOS(0));
    TimeInfo.Minute = BCD_INT(HalpQueryCMOS(2));
    TimeInfo.Hour = BCD_INT(HalpQueryCMOS(4));
    TimeInfo.Day = BCD_INT(HalpQueryCMOS(7));
    TimeInfo.Month = BCD_INT(HalpQueryCMOS(8));
    TimeInfo.Year = BCD_INT(HalpQueryCMOS(9));
    if (TimeInfo.Year > 80)
        TimeInfo.Year += 1900;
    else
        TimeInfo.Year += 2000;
 
    return &TimeInfo;
}
 
/* EOF */