110 lines
2.6 KiB
C++
110 lines
2.6 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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x86-family/cmos.cpp
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Provides access to CMOS and the real-time clock.
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*******************************************************************************/
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#include <sys/types.h>
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#include <stdint.h>
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#include <time.h>
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#include <timespec.h>
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#include <sortix/clock.h>
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#include <sortix/kernel/platform.h>
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#include <sortix/kernel/clock.h>
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#include <sortix/kernel/cpu.h>
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#include <sortix/kernel/time.h>
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namespace Sortix {
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namespace CMOS {
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const uint16_t CMOS_ADDRESS_REG = 0x70;
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const uint16_t CMOS_DATA_REG = 0x71;
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uint8_t ReadRTC(uint8_t reg)
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{
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CPU::OutPortB(CMOS_ADDRESS_REG, reg);
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return CPU::InPortB(CMOS_DATA_REG);
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}
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bool IsRTCUpdateInProgress()
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{
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return ReadRTC(0x0A) & 0x80;
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}
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uint8_t DecodeBCD(uint8_t bcd)
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{
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return bcd / 16 * 10 + bcd % 16;
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}
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void Init()
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{
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while ( !IsRTCUpdateInProgress() );
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while ( IsRTCUpdateInProgress() );
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uint8_t second = ReadRTC(0x00);
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uint8_t minute = ReadRTC(0x02);
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uint8_t hour = ReadRTC(0x04);
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uint8_t day = ReadRTC(0x07);
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uint8_t month = ReadRTC(0x08);
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uint8_t year = ReadRTC(0x09);
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uint8_t century = ReadRTC(0x32);
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uint8_t reg_b = ReadRTC(0x0B);
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bool hour12 = !(reg_b & 0x02);
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bool is_pm = hour12 && hour & 0x80;
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if ( hour12 )
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hour &= 0x7F;
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if ( !(reg_b & 0x04) )
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{
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second = DecodeBCD(second);
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minute = DecodeBCD(minute);
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hour = DecodeBCD(hour);
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day = DecodeBCD(day);
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month = DecodeBCD(month);
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year = DecodeBCD(year);
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century = DecodeBCD(century);
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}
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if ( hour12 && is_pm )
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hour = (hour + 12) % 24;
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time_t full_year = century * 100 + year;
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struct tm tm;
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memset(&tm, 0, sizeof(tm));
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tm.tm_sec = second;
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tm.tm_min = minute;
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tm.tm_hour = hour;
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tm.tm_mday = day ;
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tm.tm_mon = month - 1;
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tm.tm_year = full_year - 1900;
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time_t now = timegm(&tm);
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struct timespec current_time = timespec_make(now, 0);
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Time::GetClock(CLOCK_REALTIME)->Set(¤t_time, NULL);
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}
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} // namespace CMOS
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} // namespace Sortix
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