155 lines
3.3 KiB
C
155 lines
3.3 KiB
C
/* kern/cmos_datetime.c - CMOS datetime function.
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*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/datetime.h>
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#include <grub/cmos.h>
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grub_err_t
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grub_get_datetime (struct grub_datetime *datetime)
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{
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int is_bcd, is_12hour;
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grub_uint8_t value, flag;
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flag = grub_cmos_read (GRUB_CMOS_INDEX_STATUS_B);
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is_bcd = ! (flag & GRUB_CMOS_STATUS_B_BINARY);
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value = grub_cmos_read (GRUB_CMOS_INDEX_YEAR);
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if (is_bcd)
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value = grub_bcd_to_num (value);
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datetime->year = value;
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datetime->year += (value < 80) ? 2000 : 1900;
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value = grub_cmos_read (GRUB_CMOS_INDEX_MONTH);
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if (is_bcd)
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value = grub_bcd_to_num (value);
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datetime->month = value;
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value = grub_cmos_read (GRUB_CMOS_INDEX_DAY_OF_MONTH);
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if (is_bcd)
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value = grub_bcd_to_num (value);
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datetime->day = value;
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is_12hour = ! (flag & GRUB_CMOS_STATUS_B_24HOUR);
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value = grub_cmos_read (GRUB_CMOS_INDEX_HOUR);
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if (is_12hour)
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{
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is_12hour = (value & 0x80);
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value &= 0x7F;
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value--;
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}
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if (is_bcd)
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value = grub_bcd_to_num (value);
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if (is_12hour)
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value += 12;
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datetime->hour = value;
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value = grub_cmos_read (GRUB_CMOS_INDEX_MINUTE);
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if (is_bcd)
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value = grub_bcd_to_num (value);
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datetime->minute = value;
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value = grub_cmos_read (GRUB_CMOS_INDEX_SECOND);
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if (is_bcd)
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value = grub_bcd_to_num (value);
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datetime->second = value;
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return 0;
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}
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grub_err_t
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grub_set_datetime (struct grub_datetime *datetime)
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{
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int is_bcd, is_12hour;
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grub_uint8_t value, flag;
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flag = grub_cmos_read (GRUB_CMOS_INDEX_STATUS_B);
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is_bcd = ! (flag & GRUB_CMOS_STATUS_B_BINARY);
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value = ((datetime->year >= 2000) ? datetime->year - 2000 :
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datetime->year - 1900);
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if (is_bcd)
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value = grub_num_to_bcd (value);
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grub_cmos_write (GRUB_CMOS_INDEX_YEAR, value);
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value = datetime->month;
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if (is_bcd)
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value = grub_num_to_bcd (value);
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grub_cmos_write (GRUB_CMOS_INDEX_MONTH, value);
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value = datetime->day;
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if (is_bcd)
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value = grub_num_to_bcd (value);
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grub_cmos_write (GRUB_CMOS_INDEX_DAY_OF_MONTH, value);
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value = datetime->hour;
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is_12hour = (! (flag & GRUB_CMOS_STATUS_B_24HOUR));
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if (is_12hour)
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{
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value++;
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if (value > 12)
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value -= 12;
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else
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is_12hour = 0;
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}
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if (is_bcd)
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value = grub_num_to_bcd (value);
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if (is_12hour)
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value |= 0x80;
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grub_cmos_write (GRUB_CMOS_INDEX_HOUR, value);
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value = datetime->minute;
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if (is_bcd)
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value = grub_num_to_bcd (value);
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grub_cmos_write (GRUB_CMOS_INDEX_MINUTE, value);
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value = datetime->second;
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if (is_bcd)
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value = grub_num_to_bcd (value);
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grub_cmos_write (GRUB_CMOS_INDEX_SECOND, value);
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return 0;
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}
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