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

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//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
// Desc: Interrupt related functions //
// //
// //
// Copyright © 2018-2019 The OS/K Team //
// //
// 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/>. //
//----------------------------------------------------------------------------//
#include <kernel/base.h>
#include <kernel/iomisc.h>
#include <extras/buf.h>
#include <kernel/time.h>
static ulong IoRtcTicks = 0;
static uchar RtcRate = 0x05; //2048Hz
static Time_t IoRtcOriginTime;
static Time_t IoRtcTime;
static char time24or12Mode;
static void GetTimeFromRtc(void)
{
Time_t lastTime;
char updateInProgress = 1;
while(updateInProgress) { // wait while the RTC updates its value
IoWriteByteOnPort(0x70, 0x0A);
updateInProgress = (IoReadByteFromPort(0x71) & 0x80);
}
IoWriteByteOnPort(0x70, 0x0);
IoRtcOriginTime.sec = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x02);
IoRtcOriginTime.min = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x04);
IoRtcOriginTime.hour = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x06);
IoRtcOriginTime.weekday = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x07);
IoRtcOriginTime.day = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x08);
IoRtcOriginTime.month = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x09);
IoRtcOriginTime.year = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x32);
IoRtcOriginTime.century = IoReadByteFromPort(0x71);
// Now while we don't get the same value, read the registers (ensure data are valid)
do {
lastTime.sec = IoRtcOriginTime.sec;
lastTime.min = IoRtcOriginTime.min;
lastTime.hour = IoRtcOriginTime.hour;
lastTime.weekday = IoRtcOriginTime.weekday;
lastTime.day = IoRtcOriginTime.day;
lastTime.month = IoRtcOriginTime.month;
lastTime.year = IoRtcOriginTime.year;
lastTime.century = IoRtcOriginTime.century;
while(updateInProgress) { // wait while the RTC updates its value
IoWriteByteOnPort(0x70, 0x0A);
updateInProgress = (IoReadByteFromPort(0x71) & 0x80);
}
IoWriteByteOnPort(0x70, 0x0);
IoRtcOriginTime.sec = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x02);
IoRtcOriginTime.min = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x04);
IoRtcOriginTime.hour = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x06);
IoRtcOriginTime.weekday = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x07);
IoRtcOriginTime.day = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x08);
IoRtcOriginTime.month = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x09);
IoRtcOriginTime.year = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x32);
IoRtcOriginTime.century = IoReadByteFromPort(0x71);
} while ( (lastTime.sec != IoRtcOriginTime.sec) || (lastTime.min != IoRtcOriginTime.min) ||
(lastTime.hour != IoRtcOriginTime.hour) || (lastTime.weekday != IoRtcOriginTime.weekday) ||
(lastTime.day != IoRtcOriginTime.day) || (lastTime.month != IoRtcOriginTime.month) ||
(lastTime.year != IoRtcOriginTime.year) || (lastTime.century != IoRtcOriginTime.century)
);
IoWriteByteOnPort(0x70, 0x0B);
time24or12Mode = IoReadByteFromPort(0x71);
// Convert to binary if it is necessary
if (!(time24or12Mode & 0x04)) {
IoRtcOriginTime.sec = (IoRtcOriginTime.sec & 0x0F)
+ ((IoRtcOriginTime.sec / 16) * 10);
IoRtcOriginTime.min = (IoRtcOriginTime.min & 0x0F)
+ ((IoRtcOriginTime.min / 16) * 10);
IoRtcOriginTime.hour = ( (IoRtcOriginTime.hour & 0x0F)
+ (((IoRtcOriginTime.hour & 0x70) / 16) * 10) )
| (IoRtcOriginTime.hour & 0x80);
IoRtcOriginTime.day = (IoRtcOriginTime.day & 0x0F) + ((IoRtcOriginTime.day / 16) * 10);
IoRtcOriginTime.month = (IoRtcOriginTime.month & 0x0F)
+ ((IoRtcOriginTime.month / 16) * 10);
IoRtcOriginTime.year = (IoRtcOriginTime.year & 0x0F)
+ ((IoRtcOriginTime.year / 16) * 10);
IoRtcOriginTime.century = (IoRtcOriginTime.century & 0x0F)
+ ((IoRtcOriginTime.century / 16) * 10);
IoRtcOriginTime.weekday = (IoRtcOriginTime.weekday & 0x0F)
+ ((IoRtcOriginTime.weekday / 16) * 10);
}
// Convert 12 to 24 hour if necessary
if (!(time24or12Mode & 0x02) && (IoRtcOriginTime.hour & 0x80)) {
IoRtcOriginTime.hour = ((IoRtcOriginTime.hour & 0x7)+ 10) % 24;
}
IoRtcTime.sec = IoRtcOriginTime.sec;
IoRtcTime.min = IoRtcOriginTime.min;
IoRtcTime.hour = IoRtcOriginTime.hour;
IoRtcTime.weekday = IoRtcOriginTime.weekday;
IoRtcTime.day = IoRtcOriginTime.day;
IoRtcTime.month = IoRtcOriginTime.month;
IoRtcTime.year = IoRtcOriginTime.year;
IoRtcTime.century = IoRtcOriginTime.century;
}
void RtcHandler(ISRFrame_t *regs)
{
//bprintf(BStdOut, " *RTC - ");
IoWriteByteOnPort(0x70, 0x0C); // Selects status reg C
IoReadByteFromPort(0x71); // Flush
IoRtcTicks++;
IoSendEOItoPIC(0x28);
//bprintf(BStdOut, " - EOI* ");
}
void IoPrintRtcTime(void)
{
Time_t* RtcTime = IoGetRtcTime();
KernLog("[RTC Time] %02d/%02d/%04d ; %02d:%02d:%02d \n\n",
RtcTime->day,
RtcTime->month,
RtcTime->year + RtcTime->century*100,
RtcTime->hour,
RtcTime->min,
RtcTime->sec
);
}
// FIXME XXX FIXME
error_t IoGetRtcTimeChar(char *timeChar)
{
Time_t *RtcTime = IoGetRtcTime();
sprintf(timeChar, "%hhd/%hhd/%hd ; %hhd:%hhd:%hhd",
RtcTime->day,
RtcTime->month,
RtcTime->year + RtcTime->century*100,
RtcTime->hour,
RtcTime->min,
RtcTime->sec
);
return EOK;
}
// END OF FIXME XXX FIXME
static void UpdateRtcTime(void)
{
ulong frequency = 32768 >> (RtcRate-1);
uchar minRemain, hourRemain, dayRemain;
IoRtcTime.sec =
(uchar)(((ulong)IoRtcOriginTime.sec + (IoRtcTicks / frequency)) % 60);
minRemain =
(uchar)(((ulong)IoRtcOriginTime.sec + (IoRtcTicks / frequency)) / 60);
IoRtcTime.min =
(uchar)(((ulong)IoRtcOriginTime.min + minRemain) % 60);
hourRemain =
(uchar)(((ulong)IoRtcOriginTime.min + minRemain) / 60);
IoRtcTime.hour =
(uchar)(((ulong)IoRtcOriginTime.hour + hourRemain) % 24);
dayRemain =
(uchar)(((ulong)IoRtcOriginTime.hour + hourRemain) / 24);
if (dayRemain) {
KeStartPanic("[RTC Time] We must shutdown this computer for your safety.\n");
}
}
Time_t* IoGetRtcTime(void)
{
UpdateRtcTime();
return &IoRtcTime;
}
ulong IoGetRtcTicks(void)
{
return IoRtcTicks;
}
void IoEnableRtc(void)
{
ulong flags = KePauseIRQs();
char readInterruptConfig;
char readRegister;
char readIrqs;
IdtRegisterIrq(RtcHandler, 0x28, 0x8E);
// Setting up the register control and interrupt rates
DebugLog("[RTC Time] Interrupt frequency set to %d Hz\n",
32768 >> (RtcRate-1));
IoWriteByteOnPort(0x70, 0x8B);
readRegister = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x8B); // Because reading flushes
IoWriteByteOnPort(0x71, readRegister | 0x40);
IoWriteByteOnPort(0x70, 0x8A);
readInterruptConfig = IoReadByteFromPort(0x71);
IoWriteByteOnPort(0x70, 0x8A); // Because reading flushes
IoWriteByteOnPort(0x71, (readInterruptConfig & 0xF0) | RtcRate);
IoWriteByteOnPort(0x70, 0x0C);
IoReadByteFromPort(0x71); // Flush
// Setting up the IRQs
readIrqs = IoReadByteFromPort(0xA1);
IoWriteByteOnPort(0xA1, 0xFE & readIrqs); // Enables IRQ on PIC 2
readIrqs = IoReadByteFromPort(0x21);
IoWriteByteOnPort(0x21, 0xFB & readIrqs); // Enables IRQ on PIC 1
// Clean-up
IoWriteByteOnPort(0x70, 0x0C); // Select status reg C
IoReadByteFromPort(0x71); // Flush
GetTimeFromRtc();
KeRestoreIRQs(flags);
IoEnableNMI();
}
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