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rockOS/kernel/arch/i386/boot/pic.c

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2022-07-21 21:59:23 +03:00
/**
* PIC section of rockOS
* Copyright (C) 2022 Furkan Mudanyali
*
* This program 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
* (at your option) any later version.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
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#include <rockos/pic.h>
#include <stdio.h>
void PIC_remap() {
printf("Beginning PIC initialization.\n");
outb(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4); // Start init sequence in cascade mode
io_wait();
outb(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4);
io_wait();
outb(PIC1_DATA, PIC1_OFFSET); // ICW2: Master PIC vector offset
io_wait();
outb(PIC2_DATA, PIC2_OFFSET); // ICW2: Slave PIC vector offset
io_wait();
outb(PIC1_DATA, 4); // ICW3: tell Master PIC that theres a slave PIC at IRQ2 (0000 0100)
io_wait();
outb(PIC2_DATA, 2); // ICW3: tell Slave PIC its cascade identity (0000 0010)
io_wait();
outb(PIC1_DATA, ICW4_8086);
io_wait();
outb(PIC2_DATA, ICW4_8086);
io_wait();
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outb(PIC1_DATA, 0); // ALL THE INTERRUPTS
outb(PIC2_DATA, 0);
}