/*
 * 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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _SYS_FS_PC_LABEL_H
#define _SYS_FS_PC_LABEL_H

#ifdef  __cplusplus
extern "C" {
#endif

#include <sys/isa_defs.h>

/*
 * PC master boot block & partition table defines.
 */

#define PCB_BPSEC       11      /* (short) bytes per sector */
#define PCB_SPC         13      /* (byte) sectors per cluster */
#define PCB_RESSEC      14      /* (short) reserved sectors */
#define PCB_NFAT        16      /* (byte) number of fats */
#define PCB_NROOTENT    17      /* (short) number of root dir entries */
#define PCB_NSEC        19      /* (short) number of sectors on disk */
#define PCB_MEDIA       21      /* (byte) media descriptor */
#define PCB_SPF         22      /* (short) sectors per fat */
#define PCB_SPT         24      /* (short) sectors per track */
#define PCB_NHEAD       26      /* (short) number of heads */
#define PCB_HIDSEC      28      /* (short) number of hidden sectors */

#define PCFS_PART       0x1be   /* partition table offs in blk 0 of unit */
#define PCFS_NUMPART    4       /* Number of partitions in blk 0 of unit */

/*
 *  Offsets into the boot sector where the string 'FAT' is expected.
 *  First value is where the string is on 12 and 16 bit FATs,
 *  the second value is where it is on 32 bit FATs.
 */
#define PCFS_TYPESTRING_OFFSET16        0x36
#define PCFS_TYPESTRING_OFFSET32        0x52

#define PCFS_BPB        0xb     /* offset of the BPB in the boot block  */
#define PCFS_SIGN       0x1fe   /* offset of the DOS signature          */
#define DOS_SYSFAT12    1       /* DOS FAT 12 system indicator          */
#define DOS_SYSFAT16    4       /* DOS FAT 16 system indicator          */
#define DOS_SYSHUGE     6       /* DOS FAT 16 system indicator > 32MB   */
#define DOS_FAT32       0xB     /* FAT32 system indicator */
#define DOS_FAT32_LBA   0xC     /* FAT32 system indicator (LBA) */
#define DOS_FAT16P_LBA  0xE     /* FAT16 system indicator (Primary/LBA ) */
#define DOS_FAT16_LBA   0xF     /* FAT16 system indicator (Extended/LBA) */
#define DOS_F12MAXS     20740   /* Max sector for 12 Bit FAT (DOS>=3.2) */
#define DOS_F12MAXC     4086    /* Max cluster for 12 Bit FAT (DOS>=3.2) */

#define DOS_ID1         0xe9    /* JMP intrasegment                     */
#define DOS_ID2a        0xeb    /* JMP short                            */
#define DOS_ID2b        0x90
#define DOS_SIGN        0xaa55  /* DOS signature in boot and partition  */

#define PC_FATBLOCK     1       /* starting block number of fat */
/*
 * Media descriptor byte.
 * Found in the boot block and in the first byte of the FAT.
 * Second and third byte in the FAT must be 0xFF.
 * Note that all technical sources indicate that this means of
 * identification is extremely unreliable.
 */
#define MD_FIXED        0xF8    /* fixed disk                           */
#define SS8SPT          0xFE    /* single sided 8 sectors per track     */
#define DS8SPT          0xFF    /* double sided 8 sectors per track     */
#define SS9SPT          0xFC    /* single sided 9 sectors per track     */
#define DS9SPT          0xFD    /* double sided 9 sectors per track     */
#define DS18SPT         0xF0    /* double sided 18 sectors per track    */
#define DS9_15SPT       0xF9    /* double sided 9/15 sectors per track  */

#define PC_SECSIZE      512     /* pc filesystem sector size */

/*
 * conversions to/from little endian format
 */
#if defined(_LITTLE_ENDIAN)
/* e.g. i386 machines */
#define ltohs(S)        (*((ushort_t *)(&(S))))
#define ltohi(I)        (*((uint_t *)(&(I))))
#define htols(S)        (*((ushort_t *)(&(S))))
#define htoli(I)        (*((uint_t *)(&(I))))

#else
/* e.g. SPARC machines */
#define getbyte(A, N)   (((unsigned char *)(&(A)))[N])
#define ltohs(S)        ((getbyte(S, 1) << 8) | getbyte(S, 0))
#define ltohi(I)        ((getbyte(I, 3) << 24) | (getbyte(I, 2) << 16) | \
                            (getbyte(I, 1) << 8) | getbyte(I, 0))
#define htols(S)        ((getbyte(S, 1) << 8) | getbyte(S, 0))
#define htoli(I)        ((getbyte(I, 3) << 24) | (getbyte(I, 2) << 16) | \
                            (getbyte(I, 1) << 8) | getbyte(I, 0))
#endif

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_FS_PC_LABEL_H */