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      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
     33 extern "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