loadwarka/src/main.c

/*
    Copyright (c) 2022 Alex Kotov <kotovalexarian@gmail.com>

    This program 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 2 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 General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include <stdint.h>
#include <stdio.h>

#define MBR_SIZE 512
#define MBR_ENTRIES 4
#define MBR_MAGIC 0xAA55

struct MbrEntry {
    uint8_t  drive_attributes;
    unsigned start_chs_address : 24;
    uint8_t  partition_type;
    unsigned last_chs_address : 24;
    uint32_t start_lba;
    uint32_t sectors_count;
}
__attribute__((packed));

struct MbrInfo {
    uint32_t disk_id;
    uint16_t reserved;
    struct MbrEntry entries[MBR_ENTRIES];
    uint16_t magic;
}
__attribute__((packed));

struct Mbr {
    uint8_t bootstrap[MBR_SIZE - sizeof(struct MbrInfo)];
    struct MbrInfo info;
}
__attribute__((packed));

int main()
{
    printf("Hello, World!\n");
    return 0;
}