pc_label.h revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* 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
#pragma ident "%Z%%M% %I% %E% SMI"
#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 */