/*
 * interrupt.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 _INTERRUPT_H_
#define _INTERRUPT_H_

#include <common.h>
#include <sdk/cpu.h>
#include <sdk/list.h>

#define IDT_NUM_INTERRUPTS 256
#define ISR_STUB_SIZE 64
#define HAS_ERROR_CODE(x) (((x) == 8) || ((x) >= 10 && (x) <= 14))
#define IDT_GATE_KERNEL 0x8E
#define IDT_GATE_USER 0xEE
#define CONTEXT_SWITCH_MAGIC 0xDEADBEEF

#pragma pack(push, 1)
typedef struct
{
    word_t offset;
    word_t selector;
    byte_t zero;
    byte_t type;
    word_t offset_high;
} idt_entry_t;
#pragma pack(pop)

typedef void (*isr_proc_t)(registers_t *regs, byte_t interrupt_num);

typedef struct
{
    isr_proc_t procedure;
    bool_t interrupts;
} interrupt_handler_t;

void interrupt_init(void);
dword_t set_int_handler(byte_t interrupt_num, isr_proc_t proc, bool_t interrupts, bool_t usermode);
dword_t remove_int_handler(byte_t interrupt_num);

#endif