reactos/boot/freeldr/freeldr/arch/i386/xboxrtc.c

   1 /* $Id$
   2  *
   3  *  FreeLoader
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License along
  16  *  with this program; if not, write to the Free Software Foundation, Inc.,
  17  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #include <freeldr.h>
  21
  22 #define RTC_REGISTER_A   0x0A
  23 #define   RTC_REG_A_UIP  0x80  /* Update In Progress bit */
  24
  25 #define BCD_INT(bcd) (((bcd & 0xf0) >> 4) * 10 + (bcd &0x0f))
  26
  27 static UCHAR
  28 HalpQueryCMOS(UCHAR Reg)
  29 {
  30   UCHAR Val;
  31   Reg |= 0x80;
  32
  33   WRITE_PORT_UCHAR((PUCHAR)0x70, Reg);
  34   Val = READ_PORT_UCHAR((PUCHAR)0x71);
  35   WRITE_PORT_UCHAR((PUCHAR)0x70, 0);
  36
  37   return(Val);
  38 }
  39
  40 TIMEINFO*
  41 XboxGetTime(VOID)
  42 {
  43     static TIMEINFO TimeInfo;
  44
  45     while (HalpQueryCMOS (RTC_REGISTER_A) & RTC_REG_A_UIP)
  46     {
  47         ;
  48     }
  49
  50     TimeInfo.Second = BCD_INT(HalpQueryCMOS(0));
  51     TimeInfo.Minute = BCD_INT(HalpQueryCMOS(2));
  52     TimeInfo.Hour = BCD_INT(HalpQueryCMOS(4));
  53     TimeInfo.Day = BCD_INT(HalpQueryCMOS(7));
  54     TimeInfo.Month = BCD_INT(HalpQueryCMOS(8));
  55     TimeInfo.Year = BCD_INT(HalpQueryCMOS(9));
  56     if (TimeInfo.Year > 80)
  57         TimeInfo.Year += 1900;
  58     else
  59         TimeInfo.Year += 2000;
  60
  61     return &TimeInfo;
  62 }
  63
  64 /* EOF */