os-k/kaleid/kernel/ke/rtc.c

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//----------------------------------------------------------------------------//
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// OS on Kaleid //
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// //
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// Desc: RTC Time related functions //
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// //
// //
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// Copyright © 2018-2021 The OS/K Team //
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// //
// This file is part of OS/K. //
// //
// OS/K is free software: you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation, either version 3 of the License, or //
// any later version. //
// //
// OS/K is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY//without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
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#include <libbuf.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;
static Time_t OriginTime;
// TODO asnprintf()
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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{
Time_t lastTime;
char updateInProgress = 1;
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// Wait while the RTC updates its value
while (updateInProgress) {
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IoWriteByteOnPort(0x70, 0x0A);
updateInProgress = (IoReadByteFromPort(0x71) & 0x80);
}
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;
lastTime.min = OriginTime.min;
lastTime.hour = OriginTime.hour;
lastTime.weekday = OriginTime.weekday;
lastTime.day = OriginTime.day;
lastTime.month = OriginTime.month;
lastTime.year = OriginTime.year;
lastTime.century = OriginTime.century;
while (updateInProgress) {
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IoWriteByteOnPort(0x70, 0x0A);
updateInProgress = (IoReadByteFromPort(0x71) & 0x80);
}
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);
OriginTime.century = IoReadByteFromPort(0x71);
} while ((lastTime.sec != OriginTime.sec)
|| (lastTime.min != OriginTime.min)
|| (lastTime.hour != OriginTime.hour)
|| (lastTime.weekday != OriginTime.weekday)
|| (lastTime.day != OriginTime.day)
|| (lastTime.month != OriginTime.month)
|| (lastTime.year != OriginTime.year)
|| (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
if (!(time24or12Mode & 0x04)) {
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OriginTime.sec = (OriginTime.sec & 0x0F)
+ ((OriginTime.sec / 16) * 10);
OriginTime.min = (OriginTime.min & 0x0F)
+ ((OriginTime.min / 16) * 10);
OriginTime.hour = ( (OriginTime.hour & 0x0F)
+ (((OriginTime.hour & 0x70) / 16) * 10) )
| (OriginTime.hour & 0x80);
OriginTime.day = (OriginTime.day & 0x0F)
+ ((OriginTime.day / 16) * 10);
OriginTime.month = (OriginTime.month & 0x0F)
+ ((OriginTime.month / 16) * 10);
OriginTime.year = (OriginTime.year & 0x0F)
+ ((OriginTime.year / 16) * 10);
OriginTime.century = (OriginTime.century & 0x0F)
+ ((OriginTime.century / 16) * 10);
OriginTime.weekday = (OriginTime.weekday & 0x0F)
+ ((OriginTime.weekday / 16) * 10);
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}
// Convert 12 to 24 hour if necessary
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if (!(time24or12Mode & 0x02) && (OriginTime.hour & 0x80)) {
OriginTime.hour = ((OriginTime.hour & 0x7)+ 10) % 24;
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}
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KeSetCurTime(OriginTime);
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}
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//
// ISR handler for the real time clock
//
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static void HandleRTC(ISRFrame_t *regs)
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{
IoWriteByteOnPort(0x70, 0x0C); // Selects status reg C
IoReadByteFromPort(0x71); // Flush
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Ticks++;
KeSendEOItoPIC(0x28);
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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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Time_t* KeGetOriginTime(void)
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{
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return &OriginTime;
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}
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void KeEnableRTC(void)
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{
ulong flags = KePauseIRQs();
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char readInterruptConfig;
char readRegister;
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KeRegisterISR(HandleRTC, 0x28);
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// Setting up the register control and interrupt rates
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);
IoReadByteFromPort(0x71); // Flush
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// Setting up the IRQ line
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KeUnmaskIRQ(8);
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// Clean-up
IoWriteByteOnPort(0x70, 0x0C); // Select status reg C
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()); // init number generator
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DebugLog("RTC interrupt frequency set to %d Hz\n",
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32768 >> (RTC_RATE - 1));
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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);
ulong beginTick = KeGetClockTicks();
while (KeGetClockTicks() < beginTick + (frequency/1000) * time) {
KeRelaxCPU();
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}
}