299 lines
11 KiB
C
299 lines
11 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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static ulong IoRtcTicks = 0;
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static char IoTimeChar[22] = { 0 };
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static uchar RtcRate = 0x05; //2048Hz
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static Time_t IoRtcOriginTime;
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static Time_t IoRtcTime;
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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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while(updateInProgress) { // wait while the RTC updates its value
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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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IoRtcOriginTime.sec = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x02);
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IoRtcOriginTime.min = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x04);
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IoRtcOriginTime.hour = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x06);
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IoRtcOriginTime.weekday = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x07);
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IoRtcOriginTime.day = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x08);
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IoRtcOriginTime.month = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x09);
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IoRtcOriginTime.year = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x32);
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IoRtcOriginTime.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 = IoRtcOriginTime.sec;
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lastTime.min = IoRtcOriginTime.min;
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lastTime.hour = IoRtcOriginTime.hour;
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lastTime.weekday = IoRtcOriginTime.weekday;
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lastTime.day = IoRtcOriginTime.day;
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lastTime.month = IoRtcOriginTime.month;
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lastTime.year = IoRtcOriginTime.year;
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lastTime.century = IoRtcOriginTime.century;
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while(updateInProgress) { // wait while the RTC updates its value
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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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IoRtcOriginTime.sec = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x02);
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IoRtcOriginTime.min = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x04);
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IoRtcOriginTime.hour = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x06);
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IoRtcOriginTime.weekday = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x07);
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IoRtcOriginTime.day = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x08);
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IoRtcOriginTime.month = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x09);
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IoRtcOriginTime.year = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x32);
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IoRtcOriginTime.century = IoReadByteFromPort(0x71);
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} while ( (lastTime.sec != IoRtcOriginTime.sec) || (lastTime.min != IoRtcOriginTime.min) ||
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(lastTime.hour != IoRtcOriginTime.hour) || (lastTime.weekday != IoRtcOriginTime.weekday) ||
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(lastTime.day != IoRtcOriginTime.day) || (lastTime.month != IoRtcOriginTime.month) ||
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(lastTime.year != IoRtcOriginTime.year) || (lastTime.century != IoRtcOriginTime.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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IoRtcOriginTime.sec = (IoRtcOriginTime.sec & 0x0F)
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+ ((IoRtcOriginTime.sec / 16) * 10);
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IoRtcOriginTime.min = (IoRtcOriginTime.min & 0x0F)
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+ ((IoRtcOriginTime.min / 16) * 10);
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IoRtcOriginTime.hour = ( (IoRtcOriginTime.hour & 0x0F)
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+ (((IoRtcOriginTime.hour & 0x70) / 16) * 10) )
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| (IoRtcOriginTime.hour & 0x80);
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IoRtcOriginTime.day = (IoRtcOriginTime.day & 0x0F) + ((IoRtcOriginTime.day / 16) * 10);
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IoRtcOriginTime.month = (IoRtcOriginTime.month & 0x0F)
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+ ((IoRtcOriginTime.month / 16) * 10);
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IoRtcOriginTime.year = (IoRtcOriginTime.year & 0x0F)
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+ ((IoRtcOriginTime.year / 16) * 10);
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IoRtcOriginTime.century = (IoRtcOriginTime.century & 0x0F)
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+ ((IoRtcOriginTime.century / 16) * 10);
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IoRtcOriginTime.weekday = (IoRtcOriginTime.weekday & 0x0F)
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+ ((IoRtcOriginTime.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) && (IoRtcOriginTime.hour & 0x80)) {
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IoRtcOriginTime.hour = ((IoRtcOriginTime.hour & 0x7)+ 10) % 24;
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}
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IoRtcTime.sec = IoRtcOriginTime.sec;
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IoRtcTime.min = IoRtcOriginTime.min;
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IoRtcTime.hour = IoRtcOriginTime.hour;
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IoRtcTime.weekday = IoRtcOriginTime.weekday;
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IoRtcTime.day = IoRtcOriginTime.day;
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IoRtcTime.month = IoRtcOriginTime.month;
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IoRtcTime.year = IoRtcOriginTime.year;
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IoRtcTime.century = IoRtcOriginTime.century;
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}
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void RtcHandler(ISRFrame_t *regs)
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{
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//bprintf(BStdOut, " *RTC - ");
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IoWriteByteOnPort(0x70, 0x0C); // Selects status reg C
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IoReadByteFromPort(0x71); // Flush
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IoRtcTicks++;
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IoSendEOItoPIC(0x28);
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//bprintf(BStdOut, " - EOI* ");
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}
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void IoPrintRtcTime(void)
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{
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Time_t* RtcTime = IoGetRtcTime();
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KernLog("[RTC Time] %02d/%02d/%04d ; %02d:%02d:%02d \n",
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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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}
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char* IoGetRtcTimeChar(void)
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{
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Time_t *RtcTime = IoGetRtcTime();
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snprintf(IoTimeChar, sizeof(IoTimeChar),
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"%02d/%02d/%02d ; %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 IoTimeChar;
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}
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static void UpdateRtcTime(void)
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{
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ulong frequency = 32768 >> (RtcRate-1);
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uchar minRemain, hourRemain, dayRemain;
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IoRtcTime.sec =
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(uchar)(((ulong)IoRtcOriginTime.sec + (IoRtcTicks / frequency)) % 60);
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minRemain =
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(uchar)(((ulong)IoRtcOriginTime.sec + (IoRtcTicks / frequency)) / 60);
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IoRtcTime.min =
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(uchar)(((ulong)IoRtcOriginTime.min + minRemain) % 60);
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hourRemain =
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(uchar)(((ulong)IoRtcOriginTime.min + minRemain) / 60);
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IoRtcTime.hour =
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(uchar)(((ulong)IoRtcOriginTime.hour + hourRemain) % 24);
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dayRemain =
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(uchar)(((ulong)IoRtcOriginTime.hour + hourRemain) / 24);
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if (dayRemain) {
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KeStartPanic("[RTC Time] We must shutdown this computer for your safety.\n");
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}
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}
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Time_t* IoGetRtcTime(void)
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{
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UpdateRtcTime();
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return &IoRtcTime;
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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 IoGetTimeStamp(void)
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{
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Time_t *time = IoGetRtcTime();
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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 IoGetRtcTicks(void)
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{
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return IoRtcTicks;
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}
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void IoEnableRtc(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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IdtRegisterIsr(RtcHandler, 0x28);
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// Setting up the register control and interrupt rates
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DebugLog("[RTC Time] Interrupt frequency set to %d Hz\n",
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32768 >> (RtcRate-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) | RtcRate);
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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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IoEnableNMI();
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srand(IoGetTimeStamp());
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}
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void IoRtcWait(uint time) // time in ms
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{
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ulong frequency = 32768 >> (RtcRate-1);
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ulong beginTick = IoGetRtcTicks();
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while(IoGetRtcTicks() < beginTick + (frequency/1000) * time) {
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KePauseCPU();
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}
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}
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