/* interrupt.h - This file is a part of NutsOS
 * 
 * NutsOS
 * Copyright (C) 2013  Free Software Foundation, Inc.
 *
 * NutsOS 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.
 *
 * NutsOS 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 NutsOS; If not, see <http://www.gnu.org/licenses/>.
 *
 * Valentin Verdier <valentin.verdier03@gmail.com>
 */

#pragma once
#ifndef INTERRUPT_H
#define INTERRUPT_H

#include "types.h"

/* === Configuration du PIC 8259A === */

#define PIC_MASTER_CMD_REG 0x20
#define PIC_MASTER_DATA_REG 0x21
#define PIC_MASTER_IDT_OFFSET 0x20

#define PIC_SLAVE_CMD_REG 0xA0
#define PIC_SLAVE_DATA_REG 0xA1
#define PIC_SLAVE_IDT_OFFSET 0x28

#define PIC_EOI 0x20

void PIC_init();
void PIC_maskIRQ(T_byte);
void PIC_sendEOI();

/* ======================================================================== */


/* ===== Manipulation de l'IDT ===== */

#define IDT_BASE 0x200800
#define INT_DESC_SIZE 8
#define IDT_SIZE 256

#define DIVIDE_BY_0_INT 0
#define NMI_INT 2
#define BREAKPOINT_INT 3
#define OVERFLOW_INT 4
#define INVALID_TSS_INT 10

#define SEG_FAULT_INT 11
#define STACK_SEG_FAULT_INT 12
#define GP_FAULT_INT 13
#define PAGE_FAULT_INT 14

#define TIMER_INT 32
#define KB_INT 33
#define SYS_CALL_INT 64

typedef struct {
	T_word offset0_15;
	T_word segment;
	T_word type;
	T_word offset16_31;
}__attribute__((packed)) T_IDT_desc;

typedef struct {
	T_word limite;
	T_dword base;
}__attribute__((packed)) T_IDT_reg;


void IDT_init();
void IDT_createDesc(T_dword, T_word, T_word, unsigned int);

/* ======================================================================== */


/* Routine d'interruption en assembleur (redirection vers routines en C) */

void _defaultInt();
void _SEG_fault();
void _GP_fault();
void _page_fault();
void _clockInterrupt();
void _syscall();

/* ======================================================================== */


#endif