/* kernLdr.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 NOS_KERNLDR_H
#define NOS_KERNLDR_H

#include <stdarg.h>
#include "types.h"
#include "drivers/ATA.h"


/* Structure de passage d'arguments */
typedef struct {
	T_dword low_addr;
	T_dword high_addr;
	T_dword low_size;
	T_dword high_size;
	T_dword type;
	T_dword unused;
}__attribute__((packed)) T_mmap_entry;

#define BOOT_ARGS_ADDR 0x1000

typedef struct {
	T_byte cursor_x;
	T_byte cursor_y;
	T_byte mmap_entry_count;
	T_mmap_entry mmap[30]; /* Taille fixée arbitrairement */
}__attribute__((packed)) T_boot_args;

#define KERNEL_ARGS_ADDR 0x1400

typedef struct {
	T_byte cursor_x;
	T_byte cursor_x;
	T_dword pmem_size;
	T_byte mmap_entry_count;
	T_dword init_proc_addr;
	T_dword init_proc_size;
	T_mmap_entry* mmap;
}__attribute__((packed)) T_kernel_args;

/* ############################## */


/* ######### Affichage ########## */
#define VIDEO_ADDR 0xB8000
#define VIDEO_SIZE 0xFA0
#define VIDEO_END_OFFSET 0xB8FA0
#define DEFAULT_COLOR 0x0F

char pos_x;
char pos_y;
int enable_cursor;

void scrollup(int);
void write_char(char, char);
void print(char*, ...);
void clear();
void show_cursor();
void hide_cursor();
void move_cursor(char, char);
/* ############################## */


/* ####### Fonctions I/O ######## */
void _out(T_word, T_byte);
T_byte _in(T_word);
void _outw(T_word, T_word);
T_word _inw(T_word);
void _outdw(T_word, T_dword);
T_dword _indw(T_word);
/* ############################## */


/* ########### Divers ########### */
void memcopy(char*, char*, unsigned int);
int strcmp(char*, char*);
void int_to_str(unsigned int, char*, int);
unsigned int expo(int, int);
void delay(unsigned int);
/* ############################## */


/* ###### Structure MBR et Table de partition */

#define PARTITION_BOOT_SIGN 0x80
#define VFAT32_PARTITION_ID 0x07

typedef struct {
	T_byte bootsign;
	T_byte chs_start_head;
	T_byte chs_start_sector:6;
	T_word chs_start_cylinder:10;
	T_byte fs_id;
	T_byte chs_end_head;
	T_byte chs_end_sector:6;
	T_word chs_end_cylinder:10;
	T_dword lba_start_sector;
	T_dword lba_sector_count;
}__attribute__((packed)) T_partition_entry;

#define MBR_BOOT_SIGN 0xAA55

typedef struct {
	T_byte bootcode[446];
	T_partition_entry pt[4];
	T_word bootsign;
}__attribute__((packed)) T_MBR;

/* ########################################## */

/* ###### Fat32 structure ####### */
typedef struct {
	T_byte jumpcode[3];
	char OEM_identifier[8];
	T_word byte_per_sect;
	T_byte sect_per_cluster;
	T_word reserved_sect_count;
	T_byte fat_count;
	T_word unused_1;
	T_word total_sect_count_16;
	T_byte media_desc_type;
	T_word unused_2;
	T_word sect_per_track;
	T_word head_count;
	T_dword hidden_sect_lba;
	T_dword total_sect_count_32;
	T_dword sect_per_fat;
	T_word fat_info;
	T_word fat_ver;
	T_dword rootdir_first_cluster;
	T_word fs_info_sect;
	T_word dbr_cpy_sect;
	T_byte reserved[12];
	T_byte bios_disk_id;
	T_byte reserved_NT; /* Windows NT flags */
	T_byte sign;
	T_dword serial_num;
	char label[11];
	char identifier_str[8];
	T_byte bootcode[420];
	T_word bootsign;
}__attribute__((packed)) T_FAT32_dbr;

#define FAT32_DIR_ENTRY_SIZE 32

typedef struct {
	T_byte entry_num;
	char char_part1[10];
	T_byte attribute;
	T_byte lfn_entry_type;
	T_byte checksum;
	char char_part2[12];
	T_word null;
	char char_part3[4];
}__attribute__((packed)) T_FAT32_lfn_entry;

typedef struct {
	char filename[8];
	char extention[3];
	T_byte attribute;
	T_byte reserved; /* Windows NT */
	T_byte creation_time_1;
	T_word creation_time_2;
	T_word creation_date;
	T_word last_acces;
	T_word high_first_cluster;
	T_word modif_time;
	T_word modif_date;
	T_word low_first_cluster;
	T_dword file_size;
}__attribute__((packed)) T_FAT32_std_entry;

typedef struct {
	T_ATA_device device;
	T_FAT32_dbr dbr;
	
	/* Buffer de lecture */
	unsigned int loaded_fat_sect;
	T_dword fat_sect_buf[128]; /* 512 octets */
	T_dword* dir_cluster_buf;

	/* Adresses LBA des structures sur le disque */
	T_dword LBA_dbr;
	T_dword LBA_fat;
	T_dword LBA_first_sata_sect; /* cluster 2 */
} T_FAT32_partition;

#endif