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/*
* mknbi.h - mknbi constants and type definitions for DOS loader
*
* Copyright (C) 1996-1998 Gero Kuhlmann <gero@gkminix.han.de>
*
* 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
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _MKNBI_H_DOS_
#define _MKNBI_H_DOS_
/*
* Include version information
*/
#include "version.h"
/*
* Everything in this file has to be in packed structures.
*/
#ifdef USE_PRAGMA
#pragma pack(1)
#endif
#ifdef USE_PRAGMA_ALIGN
#pragma options align=packed
#endif
/*
* The bootrom loads the load header to 0x10000, the primary boot
* loader to 0x10400, and the ram disk image at the first address
* above the HMA int extended memory.
*/
#define HEADERSEG 0x1000 /* segment for primary load header */
#define HEADERLSIZE 512L /* maximum load size of load header */
#define HEADERMSIZE 512L /* maximum memory size of load header */
#define LOADERSEG 0x1040 /* segment for primary boot loader */
#define LOADERLSIZE 64512L /* maximum load size of boot loader */
#define LOADERMSIZE 64512L /* maximum memory size of boot loader */
#define RDADDR 0x110000L /* start of ext memory at top of HMA */
#define MAX_CYLS 255 /* max number of cylinders */
#define MAX_SECTS 63 /* max number of sectors */
#define MAX_RDSIZE (MAX_CYLS * MAX_SECTS) /* max size of ram disk in kB */
#define MIN_RDSIZE 360 /* min size of ram disk in kB */
#define MAX_IOSYS 58 /* max sects for IO.SYS */
/*
* Defines for handling all the boot sector stuff.
*/
#define SECTSIZE 512 /* Size of one sector */
struct boot_record {
__u8 jmp_opcode[3] PACKED; /* jump opcode */
__u8 oem_name[8] PACKED; /* OEM name */
__u16 bytes_per_sect PACKED; /* bytes per sector */
__u8 sect_per_cluster PACKED; /* sectors per cluster */
__u16 reserved_sect PACKED; /* reserved sectors */
__u8 fat_num PACKED; /* number of FATs */
__u16 dir_num PACKED; /* dir entries */
__u16 sect_num PACKED; /* number of sectors */
__u8 media_id PACKED; /* media ID */
__u16 sect_per_fat PACKED; /* sectors per FAT */
__u16 sect_per_track PACKED; /* sectors per track */
__u16 head_num PACKED; /* number of heads */
struct i_long hidden_num PACKED; /* hidden sectors */
struct i_long sect_num_32 PACKED; /* sects if part > 32MB */
__u8 boot_id PACKED; /* id of boot disk */
__u16 dev_attr PACKED; /* device attribute */
struct i_long vol_num PACKED; /* volume number */
__u8 vol_name[11] PACKED; /* volume name */
__u8 fat_name[8] PACKED; /* FAT name */
};
/* Private extensions to boot record */
struct priv_boot {
struct boot_record boot_rec PACKED; /* official boot record */
__u16 io_sys_sects PACKED; /* no of sectors in IO.SYS */
};
#define BOOT_FAT12_MAX 0x0fef /* max clust # for 12 bit FAT */
#define BOOT_FAT12_NAME "FAT12 " /* FAT id for 12 bit FATs */
#define BOOT_FAT16_NAME "FAT16 " /* FAT id for 16 bit FATs */
#define BOOT_SIGNATURE 0xaa55 /* boot signature */
#define BOOT_PART_OFF 0x01be /* partition table offset */
#define BOOT_SIG_OFF 0x01fe /* boot signature offset */
#define BOOT_ACTIVE 0x80 /* marks active partition */
#define BOOT_TYPE_12 0x01 /* partition type (FAT12) */
#define BOOT_TYPE_16 0x04 /* partition type (FAT16) */
#define BOOT_DEV_FD 0x00 /* BIOS id of floppy drive */
#define BOOT_DEV_HD 0x80 /* BIOS id of hard disk drive */
#define BOOT_MEDIA_ID 0xf8 /* media id for hard disk */
struct partition {
__u8 status PACKED; /* status of entry */
__u8 first_head PACKED; /* start head for partition */
__u8 first_sector PACKED; /* start sector of partition */
__u8 first_track PACKED; /* start track of partition */
__u8 type PACKED; /* partition type */
__u8 last_head PACKED; /* end head for partition */
__u8 last_sector PACKED; /* end sector of partition */
__u8 last_track PACKED; /* end track of partition */
struct i_long first_abs_sector PACKED; /* first absolute sector num */
struct i_long number_sectors PACKED; /* number of sectors */
};
/*
* Definitions for DOS directory entries
*/
struct dos_dir {
__u8 name[8] PACKED; /* name of file */
__u8 ext[3] PACKED; /* file extension */
__u8 attrib PACKED; /* file attributes */
__u8 res[10] PACKED; /* reserved */
__u16 time PACKED; /* time of last access */
__u16 date PACKED; /* date of last access */
__u16 cluster PACKED; /* number of start cluster */
struct i_long size PACKED; /* size of file in bytes */
};
#define ATTR_READONLY 0x01 /* read only file */
#define ATTR_HIDDEN 0x02 /* hidden file */
#define ATTR_SYSTEM 0x04 /* system file */
#define ATTR_LABEL 0x08 /* filesystem label */
#define ATTR_DIR 0x10 /* directory */
/*
* The boot image has the following header in it's first sector
*/
struct load_header {
struct i_long magic PACKED; /* magic number */
__u8 hlength PACKED; /* length of header */
__u8 hflags1 PACKED; /* header flags */
__u8 hflags2 PACKED;
__u8 hflags3 PACKED;
struct i_addr locn PACKED; /* location of this header */
struct i_addr execute PACKED; /* execution address */
__u8 dummy[494]; /* up to full sector */
__u16 bootsig PACKED; /* boot signature */
};
#define HEADER_MAGIC 0x1B031336 /* Magic no for load header */
/*
* In the header sector are the load records located, which actually tell
* which part of the following image has to go where in memory
*/
struct disk_geometry {
__u16 num_sectors PACKED; /* total # of sectors */
__u16 sect_per_track PACKED; /* # of sectors per track */
__u16 cylinders PACKED; /* # of cylinders */
__u8 boot_drive PACKED; /* ID of boot drive */
__u8 no_hd_flag PACKED; /* non-zero if no hard disk */
};
union vendor_data {
struct disk_geometry geometry; /* disk geometry */
};
struct load_record {
__u8 rlength PACKED; /* length of record */
__u8 rtag1 PACKED; /* record tags */
__u8 rtag2 PACKED;
__u8 rflags PACKED; /* record flags */
struct i_long address PACKED; /* abs addr for part in mem */
struct i_long ilength PACKED; /* len of part in boot image */
struct i_long mlength PACKED; /* memory needed for part */
union vendor_data vendor_data PACKED; /* optional vendor data */
};
#define FLAG_B0 1
#define FLAG_B1 2
#define FLAG_EOF 4
/*
* Number of each load record.
*/
#define LOADERNUM 0 /* primary boot loader */
#define RAMDISKNUM 1 /* ramdisk image */
#define NUM_RECORDS 2
#define VENDOR_ID "GK-mknbi-DOS" /* Vendor ID */
#define VENDOR_OFF 16 /* Offset for vendor tags */
/*
* Turnoff structure packing and return to normal data alignment.
*/
#ifdef USE_PRAGMA
#pragma pack()
#endif
#ifdef USE_PRAGMA_ALIGN
#pragma options align=reset
#endif
/*
* Global variables
*/
extern char *progname; /* program name */
extern int verbose; /* verbose flag */
extern int usehd; /* use hard disk for ramdisk */
extern int nohd; /* dont allow hard disk access */
extern int skipchk; /* skip OEM name check */
/*
* External routines
*/
extern int openrd __P((char *name, int rdsize)); /* defined in openrd.c */
/*
* Data area which contains the boot loader module
*/
extern unsigned char first_data[];
extern unsigned int first_data_size;
/*
* Data area which contains the floppy boot sector
*/
extern unsigned char boot_data[];
extern unsigned int boot_data_size;
#endif
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