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/*
* VBMouse - Programmable Interrupt Controller routines
* Copyright (C) 2022 Javier S. Pedro
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef PIC_H
#define PIC_H
#include <conio.h>
// TODO Currently do not support secondary PIC
enum {
PIC1_CMD_IOPORT = 0x20,
PIC1_DATA_IOPORT = PIC1_CMD_IOPORT+1,
PIC2_CMD_IOPORT = 0xA0,
PIC2_DATA_IOPORT = PIC2_CMD_IOPORT+1,
};
enum PIC_CMDS {
/** End-Of-Interrupt command. */
PIC_CMD_EOI = 0x20
};
static void pic_mask_irq(unsigned irq)
{
uint8_t mask = inp(PIC1_DATA_IOPORT);
mask |= (1 << irq);
outp(PIC1_DATA_IOPORT, mask);
}
static void pic_unmask_irq(unsigned irq)
{
uint8_t mask = inp(PIC1_DATA_IOPORT);
mask &= ~(1 << irq);
outp(PIC1_DATA_IOPORT, mask);
}
static void pic_eoi_irq(unsigned irq)
{
(void) irq;
outp(PIC1_CMD_IOPORT, PIC_CMD_EOI);
}
#endif // PIC_H
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