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83 lines
3.5 KiB
C
83 lines
3.5 KiB
C
//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Desc: Interrupt 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 <kernel/base.h>
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#include <kernel/iomisc.h>
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#include <extras/buf.h>
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extern void RtcIsr(void);
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ulong IoRtcTicks = 0;
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void IoSetupRtc(void)
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{
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IdtRegisterIrq(RtcIsr, 0x28, 0x8E);
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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 readedInterruptConfig;
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char readedRegister;
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char readedIrqs;
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uchar RtcRate;
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// Setting up the register control and interrupt rates
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RtcRate = 0x05;
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IoWriteByteOnPort(0x70, 0x8B);
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readedRegister = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x8B); // Because reading flushes
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IoWriteByteOnPort(0x71, readedRegister | 0x40);
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IoWriteByteOnPort(0x70, 0x8A);
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readedInterruptConfig = IoReadByteFromPort(0x71);
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IoWriteByteOnPort(0x70, 0x8A); // Because reading flushes
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IoWriteByteOnPort(0x71, (readedInterruptConfig & 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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readedIrqs = IoReadByteFromPort(0xA1);
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IoWriteByteOnPort(0xA1, 0xFE & readedIrqs); // Enables IRQ on PIC 2
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readedIrqs = IoReadByteFromPort(0x21);
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IoWriteByteOnPort(0x21, 0xFB & readedIrqs); // 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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KeRestoreIRQs(flags);
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IoEnableNMI();
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}
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void RtcHandler(void)
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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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