1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#ifndef	_SYS_FS_PC_LABEL_H
28#define	_SYS_FS_PC_LABEL_H
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32#ifdef	__cplusplus
33extern "C" {
34#endif
35
36#include <sys/isa_defs.h>
37
38/*
39 * PC master boot block & partition table defines.
40 */
41
42#define	PCB_BPSEC	11	/* (short) bytes per sector */
43#define	PCB_SPC		13	/* (byte) sectors per cluster */
44#define	PCB_RESSEC	14	/* (short) reserved sectors */
45#define	PCB_NFAT	16	/* (byte) number of fats */
46#define	PCB_NROOTENT	17	/* (short) number of root dir entries */
47#define	PCB_NSEC	19	/* (short) number of sectors on disk */
48#define	PCB_MEDIA	21	/* (byte) media descriptor */
49#define	PCB_SPF		22	/* (short) sectors per fat */
50#define	PCB_SPT		24	/* (short) sectors per track */
51#define	PCB_NHEAD	26	/* (short) number of heads */
52#define	PCB_HIDSEC	28	/* (short) number of hidden sectors */
53
54#define	PCFS_PART	0x1be	/* partition table offs in blk 0 of unit */
55#define	PCFS_NUMPART	4	/* Number of partitions in blk 0 of unit */
56
57/*
58 *  Offsets into the boot sector where the string 'FAT' is expected.
59 *  First value is where the string is on 12 and 16 bit FATs,
60 *  the second value is where it is on 32 bit FATs.
61 */
62#define	PCFS_TYPESTRING_OFFSET16	0x36
63#define	PCFS_TYPESTRING_OFFSET32	0x52
64
65#define	PCFS_BPB	0xb	/* offset of the BPB in the boot block	*/
66#define	PCFS_SIGN	0x1fe   /* offset of the DOS signature		*/
67#define	DOS_SYSFAT12    1	/* DOS FAT 12 system indicator		*/
68#define	DOS_SYSFAT16	4	/* DOS FAT 16 system indicator		*/
69#define	DOS_SYSHUGE	6	/* DOS FAT 16 system indicator > 32MB	*/
70#define	DOS_FAT32	0xB	/* FAT32 system indicator */
71#define	DOS_FAT32_LBA	0xC	/* FAT32 system indicator (LBA) */
72#define	DOS_FAT16P_LBA	0xE	/* FAT16 system indicator (Primary/LBA ) */
73#define	DOS_FAT16_LBA	0xF	/* FAT16 system indicator (Extended/LBA) */
74#define	DOS_F12MAXS	20740	/* Max sector for 12 Bit FAT (DOS>=3.2)	*/
75#define	DOS_F12MAXC	4086	/* Max cluster for 12 Bit FAT (DOS>=3.2) */
76
77#define	DOS_ID1		0xe9	/* JMP intrasegment			*/
78#define	DOS_ID2a	0xeb    /* JMP short				*/
79#define	DOS_ID2b	0x90
80#define	DOS_SIGN	0xaa55	/* DOS signature in boot and partition	*/
81
82#define	PC_FATBLOCK	1	/* starting block number of fat */
83/*
84 * Media descriptor byte.
85 * Found in the boot block and in the first byte of the FAT.
86 * Second and third byte in the FAT must be 0xFF.
87 * Note that all technical sources indicate that this means of
88 * identification is extremely unreliable.
89 */
90#define	MD_FIXED	0xF8	/* fixed disk				*/
91#define	SS8SPT		0xFE	/* single sided 8 sectors per track	*/
92#define	DS8SPT		0xFF	/* double sided 8 sectors per track	*/
93#define	SS9SPT		0xFC	/* single sided 9 sectors per track	*/
94#define	DS9SPT		0xFD	/* double sided 9 sectors per track	*/
95#define	DS18SPT		0xF0	/* double sided 18 sectors per track	*/
96#define	DS9_15SPT	0xF9	/* double sided 9/15 sectors per track	*/
97
98#define	PC_SECSIZE	512	/* pc filesystem sector size */
99
100/*
101 * conversions to/from little endian format
102 */
103#if defined(_LITTLE_ENDIAN)
104/* e.g. i386 machines */
105#define	ltohs(S)	(*((ushort_t *)(&(S))))
106#define	ltohi(I)	(*((uint_t *)(&(I))))
107#define	htols(S)	(*((ushort_t *)(&(S))))
108#define	htoli(I)	(*((uint_t *)(&(I))))
109
110#else
111/* e.g. SPARC machines */
112#define	getbyte(A, N)	(((unsigned char *)(&(A)))[N])
113#define	ltohs(S)	((getbyte(S, 1) << 8) | getbyte(S, 0))
114#define	ltohi(I)	((getbyte(I, 3) << 24) | (getbyte(I, 2) << 16) | \
115			    (getbyte(I, 1) << 8) | getbyte(I, 0))
116#define	htols(S)	((getbyte(S, 1) << 8) | getbyte(S, 0))
117#define	htoli(I)	((getbyte(I, 3) << 24) | (getbyte(I, 2) << 16) | \
118			    (getbyte(I, 1) << 8) | getbyte(I, 0))
119#endif
120
121#ifdef	__cplusplus
122}
123#endif
124
125#endif	/* _SYS_FS_PC_LABEL_H */
126