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/*
* first.inc - constants for assembler module for DOS boot 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.
*/
/*
*====================================================================
*
* Definitions for accessing the BIOS data area
*/
#define BIOS_SEG 0x0040 /* Segment of BIOS data area */
#define BIOS_FDSTAT 0x0041 /* Floppy disk status byte */
#define BIOS_HDSTAT 0x0074 /* Hard disk status byte */
#define I13_INT 0x13 * 4 /* interrupt vector 13h */
#define I2F_INT 0x2F * 4 /* interrupt vector 2Fh */
#define IF1_INT 0xF1 * 4 /* interrupt vector F1h */
#define IF8_INT 0xF8 * 4 /* interrupt vector F8h */
/*
*====================================================================
*
* Layout of disk boot sector
*/
#define SECT_SIZE 512 /* sector size must be 512 bytes */
#define DISK_BPS 11 /* offset of bytes per sectors */
#define DISK_SECTS 19 /* offset of total number of sects */
#define DISK_SPT 24 /* offset of sectors per track */
#define DISK_HEADS 26 /* offset of number of heads */
#define DISK_BOOT 36 /* offset of disk ID to boot from */
#define PART_STATUS 0x01BE /* offset of partition status */
#define PART_FRST_HEAD 0x01BF /* offset of first head number */
#define PART_FRST_SECT 0x01C0 /* offset of first sector number */
#define PART_FRST_CYL 0x01C1 /* offset of first cylinder number */
#define PART_TYPE 0x01C2 /* offset of partition id */
#define PART_LAST_HEAD 0x01C3 /* offset of last head number */
#define PART_LAST_SECT 0x01C4 /* offset of last sector number */
#define PART_LAST_CYL 0x01C5 /* offset of last cylinder number */
#define PART_ABS_SECT 0x01C6 /* offset of first sector number */
#define PART_SEC_NUM 0x01CA /* offset of number of sectors */
#define PART_ACTIVE 0x80 /* indicates active partition */
#define PART_FAT12 0x01 /* indicates partition type */
#define PART_FAT16 0x04 /* indicates partition type */
#define BOOT_ID_FD 0x00 /* BIOS id of floppy boot disk */
#define BOOT_ID_HD 0x80 /* BIOS id of hard boot disk */
#define BOOT_OFFSET 0x7C00 /* offset for boot block in segment 0 */
#define TEMP_SEGMENT 0x7000 /* segment for temporary storage */
/*
*====================================================================
*
* Layout of BIOS parameter block as used by DOS
*/
#define BPB_BPS 0 /* offset to bytes per sector */
#define BPB_SPC 2 /* offset to sectors per cluster */
#define BPB_RES 3 /* offset to # of reserved sectors */
#define BPB_FATS 5 /* offset to # of FATs */
#define BPB_DIR 6 /* offset to # of root dir entries */
#define BPB_TOT_SECTS 8 /* offset to total # of sectors */
#define BPB_MEDIA_ID 10 /* offset to media ID */
#define BPB_SPF 11 /* offset to # of sectors per FAT */
#define BPB_SPT 13 /* offset to # of sectors per track */
#define BPB_HEADS 15 /* offset to # of heads */
#define BPB_HIDDEN 17 /* offset to # of hidden sectors */
/*
*====================================================================
*
* Flags for DOS drive parameter block
*/
#define DPB_F_FIXED 0x0001 /* fixed media */
#define DPB_F_DOOR 0x0002 /* drive supports door lock status */
#define DPB_F_TSIZE 0x0004 /* all sectors in track are same size */
#define DPB_F_MULTI 0x0008 /* multiple logical units in drive */
#define DPB_F_SHARED 0x0010 /* logical for shared physical drive */
#define DPB_F_CHANGE 0x0020 /* disk change detected */
#define DPB_F_NEWPARA 0x0040 /* device parameters were changed */
#define DPB_F_FORMAT 0x0080 /* disk reformatted */
#define DPB_F_ACCESS 0x0100 /* access flag - fixed media only */
#define DPB_F_DEFAULT DPB_F_CHANGE + DPB_F_NEWPARA
#define DPB_T_360 0 /* type ID for 360kB disk */
#define DPB_T_1200 1 /* type ID for 1.2MB disk */
#define DPB_T_720 2 /* type ID for 720kB disk */
#define DPB_T_SD8 3 /* type ID for SD 8 inch disk */
#define DPB_T_HD8 4 /* type ID for HD 8 inch disk */
#define DPB_T_FIXED 5 /* type ID for fixed disk */
#define DPB_T_TAPE 6 /* type ID for tape drive */
#define DPB_T_1440 7 /* type ID for 1.44MB disk */
#define DPB_T_OPTICAL 8 /* type ID for optical disk */
#define DPB_T_2880 9 /* type ID for 2.88MB disk */
/*
*====================================================================
*
* Vendor information for the boot rom image. These values have to be
* identical to those in mknbi.h.
*/
#ifdef FREEDOS
#define VENDOR_SIZE 5 /* sizeof "mknbi-fdos-1.x-y" in dwords */
#else
#define VENDOR_SIZE 4 /* sizeof "mknbi-dos-1.x-y" in dwords */
#endif
#define VENDOR_BOOTL 16 /* tag for boot loader segment */
#ifdef FREEDOS
#define VENDOR_RAMDISK 18 /* tag for ramdisk image */
#else
#define VENDOR_RAMDISK 17 /* tag for ramdisk image */
#endif
/*
*====================================================================
*
* Layout and magic ID of boot rom image header. These values have to
* be identical to those used by the boot rom. See SPEC.DOC of the
* boot rom source for further information.
*/
#define BOOT_MAGIC 0x1B031336 /* boot image header magic cookie */
#define BOOT_SIZE 512 /* total size of boot image header */
#define BOOT_HD_SIZE 4 /* size of header in dwords */
#define BOOT_HD_MAGIC 0 /* offset for header magic number */
#define BOOT_HD_LENGTH 4 /* offset for header length */
#define BOOT_HD_FLAG1 5 /* offset for header flag 1 */
#define BOOT_HD_FLAG2 6 /* offset for header flag 2 */
#define BOOT_HD_FLAG3 7 /* offset for header flag 3 */
#define BOOT_HD_LOCN 8 /* offset for header location */
#define BOOT_HD_EXEC 12 /* offset for execute address */
#define BOOT_HD_VENDOR 16 /* offset for header vendor information */
#define BOOT_LD_SIZE 4 /* size of load record in dwords */
#define BOOT_LD_LENGTH 0 /* offset for load record length */
#define BOOT_LD_TAG1 1 /* offset for load record tag 1 */
#define BOOT_LD_TAG2 2 /* offset for load record tag 2 */
#define BOOT_LD_FLAGS 3 /* offset for load record flags */
#define BOOT_LD_ADDR 4 /* offset for absolute address */
#define BOOT_LD_ILENGTH 8 /* offset for image length */
#define BOOT_LD_MLENGTH 12 /* offset for memory length */
#define BOOT_LD_VENDOR 16 /* offset for vendor information */
#define BOOT_FLAG_B0 0x01 /* mask for load record flag B0 */
#define BOOT_FLAG_B1 0x02 /* mask for load record flag B1 */
#define BOOT_FLAG_EOF 0x04 /* mask for load record flag EOF */
#define BOOT_LD_SECNUM 0 /* offset of total number of sectors */
#define BOOT_LD_HEADS 4 /* offset of head count */
#define BOOT_LD_SPT 6 /* offset of sectors per track */
#define BOOT_LD_CYL 8 /* offset of number of cylinders */
#define BOOT_LD_DRIVE 10 /* offset of boot drive ID */
#define BOOT_LD_NOHD 11 /* offset of no-hard-disk flag */
/*
*====================================================================
*
* Layout and magic ID of bootp record. Refer to RFC 951, RFC 1048
* and RFC 1533 for further information. The BOOTP record can be
* longer than the standard length as the bootrom might be able to
* load a vendor extension file via tftp.
*/
#define BOOTP_MAGIC_RFC 0x63, 0x82, 0x53, 0x63 /* RFC 1048 vendor ID */
#define BOOTP_MAGIC_CMU 0x43, 0x4D, 0x55, 0x00 /* CMU vendor ID */
#define BOOTP_MAGIC_STA 0x53, 0x54, 0x41, 0x4E /* Stanford vendor ID */
#define BOOTP_MAGIC_LEN 4 /* length of vendor ID */
#define BOOTP_REQUEST 1 /* bootp OP-code */
#define BOOTP_REPLY 2
#define BOOTP_OP 0 /* offset to bootp OP-code */
#define BOOTP_VEND 236 /* offset to vendor information */
#define BOOTP_SIZE 300 /* size of complete bootp record */
#define BOOTP_RFC_NOP 0 /* RFC vendor tag for NO-OP */
#define BOOTP_RFC_END 255 /* RFC vendor tag for end of record */
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