/*
 *  ntloader  --  Microsoft Windows NT6+ loader
 *  Copyright (C) 2025  A1ive.
 *
 *  ntloader 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.
 *
 *  ntloader 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 ntloader.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _BIOSDISK_H
#define _BIOSDISK_H

#include <stdint.h>
#include <bootapp.h>

#if defined(__i386__) || defined(__x86_64__)

#define BIOSDISK_FLAG_LBA          1
#define BIOSDISK_FLAG_CDROM        2

/* Drive Parameters.  */
struct biosdisk_drp
{
    uint16_t size;
    uint16_t flags;
    uint32_t cylinders;
    uint32_t heads;
    uint32_t sectors;
    uint64_t total_sectors;
    uint16_t bytes_per_sector;
    /* ver 2.0 or higher */
    union
    {
        uint32_t EDD_configuration_parameters;
        /* Pointer to the Device Parameter Table Extension (ver 3.0+).  */
        uint32_t dpte_pointer;
    };
    /* ver 3.0 or higher */
    uint16_t signature_dpi;
    uint8_t length_dpi;
    uint8_t reserved[3];
    uint8_t name_of_host_bus[4];
    uint8_t name_of_interface_type[8];
    uint8_t interface_path[8];
    uint8_t device_path[16];
    uint8_t reserved2;
    uint8_t checksum;
    /* XXX: This is necessary, because the BIOS of Thinkpad X20
     *     writes a garbage to the tail of drive parameters,
     *     regardless of a size specified in a caller.  */
    uint8_t dummy[16];
} __attribute__ ((packed));

struct biosdisk_cdrp
{
    uint8_t size;
    uint8_t media_type;
    uint8_t drive_no;
    uint8_t controller_no;
    uint32_t image_lba;
    uint16_t device_spec;
    uint16_t cache_seg;
    uint16_t load_seg;
    uint16_t length_sec512;
    uint8_t cylinders;
    uint8_t sectors;
    uint8_t heads;
    uint8_t dummy[16];
} __attribute__ ((packed));

/* Disk Address Packet.  */
struct biosdisk_dap
{
    uint8_t length;
    uint8_t reserved;
    uint16_t blocks;
    uint32_t buffer;
    uint64_t block;
} __attribute__ ((packed));

struct biosdisk_data
{
    /* int13h data */
    int drive;
    unsigned long cylinders;
    unsigned long heads;
    unsigned long sectors;
    unsigned long flags;
    /* disk data */
    uint64_t total_sectors;
    unsigned int log_sector_size;
};

extern int biosdisk_read (void *disk, uint64_t sector, size_t len, void *buf);

#endif /* defined(__i386__) || defined(__x86_64__) */

extern void biosdisk_iterate (void);
extern void biosdisk_fini (void);
extern void biosdisk_init (void);

#endif