/*
 * irq.h
 *
 * Copyright (C) 2013 Aleksandar Andrejevic <theflash@sdf.lonestar.org>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _IRQ_H_
#define _IRQ_H_

#include <common.h>
#include <interrupt.h>

#define IRQ_INT_BASE 0x20
#define MAX_IRQ_COUNT 16
#define PRIMARY_IRQ_INT IRQ_INT_BASE
#define SECONDARY_IRQ_INT (IRQ_INT_BASE + 8)
#define PRIMARY_PIC_CMD 0x20
#define SECONDARY_PIC_CMD 0xA0
#define PRIMARY_PIC_DATA 0x21
#define SECONDARY_PIC_DATA 0xA1
#define PRIMARY_PIC_CASCADE_IRQ 2
#define SECONDARY_PIC_CASCADE_IRQ 1
#define PIC_8086_MODE 0x01

typedef void (*irq_handler_proc_t)(registers_t *regs, byte_t irq_num);

typedef struct
{
    list_entry_t list;
    irq_handler_proc_t procedure;
    bool_t exclusive;
} irq_handler_t;

dword_t register_irq_handler(byte_t irq_num, irq_handler_proc_t handler_proc, bool_t exclusive);
dword_t unregister_irq_handler(byte_t irq_num, irq_handler_proc_t handler_proc);
byte_t alloc_irq();
void free_irq(byte_t number);
void irq_init();

#endif
