include/grub/i386/cmos.h

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2008  Free Software Foundation, Inc.
   4  *
   5  *  GRUB 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 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB 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
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifndef GRUB_CPU_CMOS_H
  20 #define GRUB_CPU_CMOS_H 1
  21
  22 #include <grub/types.h>
  23 #include <grub/i386/io.h>
  24
  25 #define GRUB_CMOS_ADDR_REG      0x70
  26 #define GRUB_CMOS_DATA_REG      0x71
  27
  28 #define GRUB_CMOS_INDEX_SECOND          0
  29 #define GRUB_CMOS_INDEX_SECOND_ALARM    1
  30 #define GRUB_CMOS_INDEX_MINUTE          2
  31 #define GRUB_CMOS_INDEX_MINUTE_ALARM    3
  32 #define GRUB_CMOS_INDEX_HOUR            4
  33 #define GRUB_CMOS_INDEX_HOUR_ALARM      5
  34 #define GRUB_CMOS_INDEX_DAY_OF_WEEK     6
  35 #define GRUB_CMOS_INDEX_DAY_OF_MONTH    7
  36 #define GRUB_CMOS_INDEX_MONTH           8
  37 #define GRUB_CMOS_INDEX_YEAR            9
  38
  39 #define GRUB_CMOS_INDEX_STATUS_A        0xA
  40 #define GRUB_CMOS_INDEX_STATUS_B        0xB
  41 #define GRUB_CMOS_INDEX_STATUS_C        0xC
  42 #define GRUB_CMOS_INDEX_STATUS_D        0xD
  43
  44 #define GRUB_CMOS_STATUS_B_DAYLIGHT     1
  45 #define GRUB_CMOS_STATUS_B_24HOUR       2
  46 #define GRUB_CMOS_STATUS_B_BINARY       4
  47
  48 static inline grub_uint8_t
  49 grub_bcd_to_num (grub_uint8_t a)
  50 {
  51   return ((a >> 4) * 10 + (a & 0xF));
  52 }
  53
  54 static inline grub_uint8_t
  55 grub_num_to_bcd (grub_uint8_t a)
  56 {
  57   return (((a / 10) << 4) + (a % 10));
  58 }
  59
  60 static inline grub_uint8_t
  61 grub_cmos_read (grub_uint8_t index)
  62 {
  63   grub_outb (index, GRUB_CMOS_ADDR_REG);
  64   return grub_inb (GRUB_CMOS_DATA_REG);
  65 }
  66
  67 static inline void
  68 grub_cmos_write (grub_uint8_t index, grub_uint8_t value)
  69 {
  70   grub_outb (index, GRUB_CMOS_ADDR_REG);
  71   grub_outb (value, GRUB_CMOS_DATA_REG);
  72 }
  73
  74 #endif /* GRUB_CPU_CMOS_H */