fat.h so far

#ifndef __FAT_H__
#define __FAT_H__

#include <stdint.h>
#include <machine.h>

typedef struct bpb {
    char jmp_code[3];
    char oem[8];
    uint16_t bytes_per_sector;
    uint8_t sectors_per_cluster;
    uint16_t reserved_sectors;
    uint8_t fats;
    uint16_t dir_entries;
    uint16_t logical_sectors;
    uint8_t media_type;
    uint16_t sectors_per_fat;
    uint16_t sectors_per_track;
    uint16_t heads;
    uint32_t hidden_sectors;
    uint32_t large_sectors;
} bpb_t;

typedef struct ebr {
    uint8_t drive;
    uint8_t rflags;
    uint8_t signiture;
    uint32_t serial;
    char label[11];
    char identifier[8];
    char boot_code[448];
    uint16_t boot_sign;
} ebr_t;

typedef struct fat12_partition_info {
// see fat12.s for an implementation
// in assembly for visualization :D

    bpb_t bpb;
    ebr_t ebr;
    char data[];
} fat12_partition_info_t;

typedef char fat_t[];

typedef struct fat_dir_entry {
    char name[11];
    uint8_t attributes;
    uint16_t reserved;
    uint16_t creation_time;
    uint16_t creation_date;
    uint16_t access_date;
    uint16_t caddr_high;
    uint16_t write_time;
    uint16_t write_date;
    uint16_t caddr_low;
    uint32_t size;
} fat_dir_entry_t;

const uint8_t fat12_format_stub[122] = {
  0xEB, 0x3C, 0x90, 0x4D, 0x61, 0x64, 0x4F, 0x53, 0x76, 0x30,
  0x31, 0x00, 0x02, 0x01, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x29, 0x37,
  0x13, 0x00, 0x00, 0x4D, 0x61, 0x64, 0x4F, 0x53, 0x20, 0x44,
  0x69, 0x73, 0x6B, 0x20, 0x46, 0x41, 0x54, 0x31, 0x32, 0x20,
  0x20, 0x20, 0x31, 0xC0, 0x8E, 0xD8, 0x8E, 0xC0, 0x8E, 0xD0,
  0xBC, 0x7A, 0x8C, 0x8D, 0x36, 0x5E, 0x7C, 0xE8, 0x02, 0x00,
  0xEB, 0xFE, 0xAC, 0x08, 0xC0, 0x74, 0x06, 0xB4, 0x0E, 0xCD,
  0x10, 0xEB, 0xF5, 0xC3, 0x4D, 0x61, 0x64, 0x4F, 0x53, 0x20,
  0x64, 0x69, 0x73, 0x6B, 0x20, 0x6E, 0x6F, 0x74, 0x20, 0x62,
  0x6F, 0x6F, 0x74, 0x61, 0x62, 0x6C, 0x65, 0x2E, 0x2E, 0x2E,
  0x0D, 0x0A
/*
[bits 16]
[org 0x7C00]

;;;;;;;;;;;;;;;;;;;;;;;;
; BIOS Parameter Block
jmp short boot_code
nop
db "MadOSv01"          ; OEM identifier
dw 512                 ; Bytes per sector:  512, 1024, 2048 or 4096.
                       ;    the value 512 should be used for max compat.
db 1                   ; sectors per cluster:  1, 2, 4, 8, 16, 32, 64, and 128.
dw 0                   ; reserved sectors: must not be 0. For FAT12 and FAT16 volumes must be 1
db 2                   ; number of fats: always contain the value 2
dw 0                   ; root directory entries
dw 0                   ; logical sectors
db 0                   ; media descriptor type: 0xF8 -> fixed, 0xF0 -> removable
dw 0                   ; sectors per fat, fat12/fat16 only, number of sectors occupied by one fat
dw 0                   ; sectors per track
dw 0                   ; number of heads / sides on media
dd 0                   ; number of hidden sectors
dd 0                   ; Large amount of sector on media. This field is set if there are more than 65535 sectors in the volume.

; Extended Boot Record
db 0                   ; drive number
db 0                   ; reserved / NT flags (maybe use for MadOS, More research needed)
db 0x29                ; signiture, 0x28 or 0x29 for fat12 /fat16
dd 0x1337              ; volume serial number
db "MadOS Disk "       ; volume label
db "FAT12   "          ; identifier string

; Boot code
boot_code:
    xor ax, ax
    mov ds, ax
    mov es, ax
    mov ss, ax
    mov sp, boot_code_end + (1024 * 4)

    lea si, [message]
    call print_string
    jmp $

print_string:
    lodsb
    or al, al
    jz done
    mov ah, 0x0E
    int 0x10
    jmp print_string
done:
   ret

message:
    db "MadOS disk not bootable...", 0xd, 0xa

;dw 0xAA55 ; bootable partition signiture, uncomment to make the floppy boot
boot_code_end:
times 450 - (boot_code_end - boot_code) db 0

;;;;;;;;;;;;;;;;;;;;;
; DATA AREA START
;;;;;;;;;;;;;;;;;;;;;
; root directory
;;;;;;;;;;;;;;;;;;;;;
; END -> FIN
*/
};


#endif