/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1999 by Sun Microsystems, Inc.
 * All rights reserved.
 * Copyright 2024 MNX Cloud, Inc.
 */

#ifndef _PCFS_BPB_H
#define _PCFS_BPB_H

#ifdef __cplusplus
extern "C" {
#endif

/*
 * Common Bios Parameter Block definitions for the pcfs user-level utilities
 */
#define MINBPS          512
#define MAXBPS          4096

#define OPCODE1         0xE9
#define OPCODE2         0xEB
#define BOOTSECSIG      0xAA55

/*
 * Offset (in bytes) from address of boot sector to where we put
 * the backup copy of that sector.  (FAT32 only)
 */
#define BKUP_BOOTSECT_OFFSET    0xC00

#define uppercase(c)    ((c) >= 'a' && (c) <= 'z' ? (c) - 'a' + 'A' : (c))

#define FAT12_TYPE_STRING       "FAT12   "
#define FAT16_TYPE_STRING       "FAT16   "
#define FAT32_TYPE_STRING       "FAT32   "

#define FAT12_ENTSPERSECT       341
#define FAT16_ENTSPERSECT       256
#define FAT32_ENTSPERSECT       128

#ifndef SUNIXOSBOOT
#define SUNIXOSBOOT     190     /* Solaris UNIX boot partition */
#endif

/*
 *      MS-DOS Disk layout:
 *
 *      ---------------------
 *      |    Boot sector    |
 *      |-------------------|
 *      |   Reserved area   |
 *      |-------------------|
 *      |       FAT #1      |
 *      |-------------------|
 *      |       FAT #2      |
 *      |-------------------|
 *      |   Root directory  |
 *      |-------------------|
 *      |                   |
 *      |     File area     |
 *      |___________________|
 */
#ifdef _LITTLE_ENDIAN
#pragma pack(1)
#endif
struct _orig_bios_param_blk {
        uint16_t bytes_per_sector;
        uchar_t  sectors_per_cluster;
        uint16_t resv_sectors;
        uchar_t  num_fats;
        uint16_t num_root_entries;
/*
 *  The sectors_in_volume field will be zero on larger volumes (>32Mb)
 *  and newer file systems (>=MSDOS4.0).  In these cases the
 *  sectors_in_logical_volume field should be used instead.
 */
        uint16_t sectors_in_volume;
        uchar_t  media;
        uint16_t sectors_per_fat;
        uint16_t sectors_per_track;
        uint16_t heads;
/*
 *  Number of sectors in the partition prior to the start of the logical disk
 */
        uint32_t hidden_sectors;
        uint32_t sectors_in_logical_volume;
};
#ifdef _LITTLE_ENDIAN
#pragma pack()
#endif

#ifdef _LITTLE_ENDIAN
#pragma pack(1)
#endif
struct _bpb32_extensions {
        uint32_t big_sectors_per_fat;
        uint16_t ext_flags;
        uchar_t  fs_vers_lo;
        uchar_t  fs_vers_hi;
        uint32_t root_dir_clust;
        uint16_t fsinfosec;
        uint16_t backupboot;
        uint16_t reserved[6];
};
#ifdef _LITTLE_ENDIAN
#pragma pack()
#endif

#ifdef _LITTLE_ENDIAN
#pragma pack(1)
#endif
struct _bpb_extensions {
        uchar_t  phys_drive_num;
        uchar_t  reserved;
        uchar_t  ext_signature;
        uint32_t volume_id;
        uchar_t  volume_label[11];
        uchar_t  type[8];
};
#ifdef _LITTLE_ENDIAN
#pragma pack()
#endif

#ifdef _LITTLE_ENDIAN
#pragma pack(1)
#endif
struct _sun_bpb_extensions {
        uint16_t  bs_offset_high;
        uint16_t  bs_offset_low;
};
#ifdef _LITTLE_ENDIAN
#pragma pack()
#endif

/*
 * bpb_t is a conglomeration of all the fields a bpb can have.  Every
 * bpb will have the orig_bios struct, but only FAT32's will have bpb32,
 * and only Solaris boot diskettes will have the sunbpb structure.
 */
typedef struct _bios_param_blk {
        struct _orig_bios_param_blk bpb;
        struct _bpb32_extensions    bpb32;
        struct _bpb_extensions      ebpb;
        struct _sun_bpb_extensions  sunbpb;
} bpb_t;

#ifdef _LITTLE_ENDIAN
#pragma pack(1)
struct _bpb_head {
        uchar_t                     bs_jump_code[3];
        uchar_t                     bs_oem_name[8];
        struct _orig_bios_param_blk bs_bpb;
};
#pragma pack()

#pragma pack(1)
struct _boot_sector {
        struct _bpb_head            bs_front;
        struct _bpb_extensions      bs_ebpb;
        struct _sun_bpb_extensions  bs_sebpb;
        uchar_t                     bs_bootstrap[444];
        uchar_t                     bs_signature[2];
};
#pragma pack()

#pragma pack(1)
struct _boot_sector32 {
        struct _bpb_head            bs_front;
        struct _bpb32_extensions    bs_bpb32;
        struct _bpb_extensions      bs_ebpb;
        uchar_t                     bs_bootstrap[420];
        uchar_t                     bs_signature[2];
};
#pragma pack()
#else
#define ORIG_BPB_START_INDEX    8       /* index into filler field */
#define EXT_BPB_START_INDEX     33      /* index into filler field */
#define BPB_32_START_INDEX      33      /* index into filler field */
#define EXT_BPB_32_START_INDEX  61      /* index into filler field */
struct _boot_sector {
        uchar_t  bs_jump_code[3];
        uchar_t  bs_filler[59];
        uchar_t  bs_sun_bpb[4];
        uchar_t  bs_bootstrap[444];
        uchar_t  bs_signature[2];
};

struct _boot_sector32 {
        uchar_t  bs_jump_code[3];
        uchar_t  bs_filler[87];
        uchar_t  bs_bootstrap[420];
        uchar_t  bs_signature[2];
};
#endif

typedef union _ubso {
        struct _boot_sector     bs;
        struct _boot_sector32   bs32;
        struct mboot            mb;
        uchar_t                 buf[MAXBPS];
} boot_sector_t;

#ifdef __cplusplus
}
#endif

#endif /* _PCFS_BPB_H */