46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/**
|
|
* 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/>.
|
|
*/
|
|
|
|
#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();
|
|
|
|
outb(PIC1_DATA, 0); // ALL THE INTERRUPTS
|
|
outb(PIC2_DATA, 0);
|
|
} |