usr/src/uts/common/sys/fs/pc_label.h

   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 */