323 lines
10 KiB
C
323 lines
10 KiB
C
//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Desc: RTC Time related functions //
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// //
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// //
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// Copyright © 2018-2019 The OS/K Team //
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// //
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// This file is part of OS/K. //
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// //
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// OS/K 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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// any later version. //
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// //
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// OS/K 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 OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#include <lib/buf.h>
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#include <ke/time.h>
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#include <ke/idt.h>
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static ulong Ticks = 0;
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static Time_t OriginTime;
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static Time_t CurTime;
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// TODO asnprintf()
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static char TimeFmtBuf[22] = { 0 };
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static uchar RTC_RATE = 0x05; //2048Hz
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static char time24or12Mode;
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static void GetTimeFromRTC(void)
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{
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Time_t lastTime;
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char updateInProgress = 1;
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// Wait while the RTC updates its value
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while (updateInProgress) {
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IoWriteByteOnPort(0x70, 0x0A);
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updateInProgress = (IoReadByteFromPort(0x71) & 0x80);
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}
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IoWriteByteOnPort(0x70, 0x0);
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OriginTime.sec = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x02);
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OriginTime.min = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x04);
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OriginTime.hour = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x06);
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OriginTime.weekday = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x07);
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OriginTime.day = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x08);
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OriginTime.month = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x09);
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OriginTime.year = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x32);
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OriginTime.century = IoReadByteFromPort(0x71);
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// Now while we don't get the same value, read the registers (ensure data are valid)
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do {
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lastTime.sec = OriginTime.sec;
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lastTime.min = OriginTime.min;
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lastTime.hour = OriginTime.hour;
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lastTime.weekday = OriginTime.weekday;
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lastTime.day = OriginTime.day;
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lastTime.month = OriginTime.month;
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lastTime.year = OriginTime.year;
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lastTime.century = OriginTime.century;
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while (updateInProgress) {
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IoWriteByteOnPort(0x70, 0x0A);
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updateInProgress = (IoReadByteFromPort(0x71) & 0x80);
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}
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IoWriteByteOnPort(0x70, 0x0);
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OriginTime.sec = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x02);
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OriginTime.min = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x04);
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OriginTime.hour = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x06);
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OriginTime.weekday = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x07);
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OriginTime.day = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x08);
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OriginTime.month = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x09);
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OriginTime.year = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x32);
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OriginTime.century = IoReadByteFromPort(0x71);
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} while ((lastTime.sec != OriginTime.sec)
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|| (lastTime.min != OriginTime.min)
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|| (lastTime.hour != OriginTime.hour)
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|| (lastTime.weekday != OriginTime.weekday)
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|| (lastTime.day != OriginTime.day)
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|| (lastTime.month != OriginTime.month)
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|| (lastTime.year != OriginTime.year)
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|| (lastTime.century != OriginTime.century)
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);
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IoWriteByteOnPort(0x70, 0x0B);
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time24or12Mode = IoReadByteFromPort(0x71);
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// Convert to binary if it is necessary
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if (!(time24or12Mode & 0x04)) {
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OriginTime.sec = (OriginTime.sec & 0x0F)
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+ ((OriginTime.sec / 16) * 10);
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OriginTime.min = (OriginTime.min & 0x0F)
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+ ((OriginTime.min / 16) * 10);
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OriginTime.hour = ( (OriginTime.hour & 0x0F)
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+ (((OriginTime.hour & 0x70) / 16) * 10) )
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| (OriginTime.hour & 0x80);
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OriginTime.day = (OriginTime.day & 0x0F)
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+ ((OriginTime.day / 16) * 10);
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OriginTime.month = (OriginTime.month & 0x0F)
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+ ((OriginTime.month / 16) * 10);
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OriginTime.year = (OriginTime.year & 0x0F)
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+ ((OriginTime.year / 16) * 10);
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OriginTime.century = (OriginTime.century & 0x0F)
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+ ((OriginTime.century / 16) * 10);
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OriginTime.weekday = (OriginTime.weekday & 0x0F)
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+ ((OriginTime.weekday / 16) * 10);
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}
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// Convert 12 to 24 hour if necessary
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if (!(time24or12Mode & 0x02) && (OriginTime.hour & 0x80)) {
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OriginTime.hour = ((OriginTime.hour & 0x7)+ 10) % 24;
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}
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CurTime.sec = OriginTime.sec;
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CurTime.min = OriginTime.min;
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CurTime.hour = OriginTime.hour;
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CurTime.weekday = OriginTime.weekday;
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CurTime.day = OriginTime.day;
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CurTime.month = OriginTime.month;
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CurTime.year = OriginTime.year;
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CurTime.century = OriginTime.century;
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}
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//
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// ISR handler for the real time clock
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//
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static void HandleRTC(ISRFrame_t *regs)
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{
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IoWriteByteOnPort(0x70, 0x0C); // Selects status reg C
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IoReadByteFromPort(0x71); // Flush
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Ticks++;
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KeSendEOItoPIC(0x28);
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}
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char *KeFormatCurTime(void)
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{
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Time_t *RtcTime = KeGetCurTime();
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snprintf(TimeFmtBuf, sizeof(TimeFmtBuf),
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"%02d/%02d/%04d - %02d:%02d:%02d",
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RtcTime->day,
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RtcTime->month,
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RtcTime->year + RtcTime->century*100,
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RtcTime->hour,
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RtcTime->min,
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RtcTime->sec
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);
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return TimeFmtBuf;
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}
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static void UpdateCurTime(void)
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{
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ulong frequency = 32768 >> (RTC_RATE - 1);
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uchar minRemain, hourRemain, dayRemain;
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CurTime.sec =
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(uchar)(((ulong)OriginTime.sec + (Ticks / frequency)) % 60);
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minRemain =
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(uchar)(((ulong)OriginTime.sec + (Ticks / frequency)) / 60);
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CurTime.min =
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(uchar)(((ulong)OriginTime.min + minRemain) % 60);
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hourRemain =
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(uchar)(((ulong)OriginTime.min + minRemain) / 60);
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CurTime.hour =
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(uchar)(((ulong)OriginTime.hour + hourRemain) % 24);
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dayRemain =
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(uchar)(((ulong)OriginTime.hour + hourRemain) / 24);
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if (dayRemain) {
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KeStartPanic("[RTC] We must shutdown this computer for your safety.\n");
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}
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}
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Time_t* KeGetCurTime(void)
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{
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UpdateCurTime();
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return &CurTime;
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}
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static uint IsLeapYear(uint year)
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{
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if (!(year % 4)) {
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return 0;
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}
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return year % 100 == 0
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? (year % 400 == 0)
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: 1;
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}
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static uint DaysInMonth(uint month, uint year)
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{
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return (month == 2)
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? (28 + IsLeapYear(year))
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: 31 - (month - 1) % 7 % 2;
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}
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ulong KeGetTimeStamp(void)
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{
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Time_t *time = KeGetCurTime();
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uint dpy = 365 + IsLeapYear(time->year);
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uint dim = DaysInMonth(time->month, time->year + time->century * 100);
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return time->sec
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+ time->min * 60
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+ time->hour * 60 * 60
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+ time->day * 24 * 60 * 60
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+ time->month * dim * 24 * 60 * 60
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+ (time->year + time->century * 100)
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* dpy * 24 * 60 * 60;
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}
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ulong KeGetClockTicks(void)
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{
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return Ticks;
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}
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void KeEnableRTC(void)
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{
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ulong flags = KePauseIRQs();
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char readInterruptConfig;
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char readRegister;
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char readIrqs;
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KeRegisterISR(HandleRTC, 0x28);
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// Setting up the register control and interrupt rates
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DebugLog("\tRTC interrupt frequency set to %d Hz\n",
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32768 >> (RTC_RATE - 1));
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IoWriteByteOnPort(0x70, 0x8B);
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readRegister = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x8B); // Because reading flushes
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IoWriteByteOnPort(0x71, readRegister | 0x40);
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IoWriteByteOnPort(0x70, 0x8A);
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readInterruptConfig = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x8A); // Because reading flushes
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IoWriteByteOnPort(0x71, (readInterruptConfig & 0xF0) | RTC_RATE);
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IoWriteByteOnPort(0x70, 0x0C);
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IoReadByteFromPort(0x71); // Flush
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// Setting up the IRQs
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readIrqs = IoReadByteFromPort(0xA1);
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IoWriteByteOnPort(0xA1, 0xFE & readIrqs); // Enables IRQ on PIC 2
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readIrqs = IoReadByteFromPort(0x21);
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IoWriteByteOnPort(0x21, 0xFB & readIrqs); // Enables IRQ on PIC 1
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// Clean-up
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IoWriteByteOnPort(0x70, 0x0C); // Select status reg C
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IoReadByteFromPort(0x71); // Flush
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GetTimeFromRTC();
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KeRestoreIRQs(flags);
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KeEnableNMI();
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srand(KeGetTimeStamp());
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}
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void KeDelayExecution(uint time)
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{
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ulong frequency = 32768 >> (RTC_RATE - 1);
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ulong beginTick = KeGetClockTicks();
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while (KeGetClockTicks() < beginTick + (frequency/1000) * time) {
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KeRelaxCPU();
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}
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}
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