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 #ifdef __cplusplus 31 extern "C" { 32 #endif 33 34 #include <sys/isa_defs.h> 35 36 /* 37 * PC master boot block & partition table defines. 38 */ 39 40 #define PCB_BPSEC 11 /* (short) bytes per sector */ 41 #define PCB_SPC 13 /* (byte) sectors per cluster */ 42 #define PCB_RESSEC 14 /* (short) reserved sectors */ 43 #define PCB_NFAT 16 /* (byte) number of fats */ 44 #define PCB_NROOTENT 17 /* (short) number of root dir entries */ 45 #define PCB_NSEC 19 /* (short) number of sectors on disk */ 46 #define PCB_MEDIA 21 /* (byte) media descriptor */ 47 #define PCB_SPF 22 /* (short) sectors per fat */ 48 #define PCB_SPT 24 /* (short) sectors per track */ 49 #define PCB_NHEAD 26 /* (short) number of heads */ 50 #define PCB_HIDSEC 28 /* (short) number of hidden sectors */ 51 52 #define PCFS_PART 0x1be /* partition table offs in blk 0 of unit */ 53 #define PCFS_NUMPART 4 /* Number of partitions in blk 0 of unit */ 54 55 /* 56 * Offsets into the boot sector where the string 'FAT' is expected. 57 * First value is where the string is on 12 and 16 bit FATs, 58 * the second value is where it is on 32 bit FATs. 59 */ 60 #define PCFS_TYPESTRING_OFFSET16 0x36 61 #define PCFS_TYPESTRING_OFFSET32 0x52 62 63 #define PCFS_BPB 0xb /* offset of the BPB in the boot block */ 64 #define PCFS_SIGN 0x1fe /* offset of the DOS signature */ 65 #define DOS_SYSFAT12 1 /* DOS FAT 12 system indicator */ 66 #define DOS_SYSFAT16 4 /* DOS FAT 16 system indicator */ 67 #define DOS_SYSHUGE 6 /* DOS FAT 16 system indicator > 32MB */ 68 #define DOS_FAT32 0xB /* FAT32 system indicator */ 69 #define DOS_FAT32_LBA 0xC /* FAT32 system indicator (LBA) */ 70 #define DOS_FAT16P_LBA 0xE /* FAT16 system indicator (Primary/LBA ) */ 71 #define DOS_FAT16_LBA 0xF /* FAT16 system indicator (Extended/LBA) */ 72 #define DOS_F12MAXS 20740 /* Max sector for 12 Bit FAT (DOS>=3.2) */ 73 #define DOS_F12MAXC 4086 /* Max cluster for 12 Bit FAT (DOS>=3.2) */ 74 75 #define DOS_ID1 0xe9 /* JMP intrasegment */ 76 #define DOS_ID2a 0xeb /* JMP short */ 77 #define DOS_ID2b 0x90 78 #define DOS_SIGN 0xaa55 /* DOS signature in boot and partition */ 79 80 #define PC_FATBLOCK 1 /* starting block number of fat */ 81 /* 82 * Media descriptor byte. 83 * Found in the boot block and in the first byte of the FAT. 84 * Second and third byte in the FAT must be 0xFF. 85 * Note that all technical sources indicate that this means of 86 * identification is extremely unreliable. 87 */ 88 #define MD_FIXED 0xF8 /* fixed disk */ 89 #define SS8SPT 0xFE /* single sided 8 sectors per track */ 90 #define DS8SPT 0xFF /* double sided 8 sectors per track */ 91 #define SS9SPT 0xFC /* single sided 9 sectors per track */ 92 #define DS9SPT 0xFD /* double sided 9 sectors per track */ 93 #define DS18SPT 0xF0 /* double sided 18 sectors per track */ 94 #define DS9_15SPT 0xF9 /* double sided 9/15 sectors per track */ 95 96 #define PC_SECSIZE 512 /* pc filesystem sector size */ 97 98 /* 99 * conversions to/from little endian format 100 */ 101 #if defined(_LITTLE_ENDIAN) 102 /* e.g. i386 machines */ 103 #define ltohs(S) (*((ushort_t *)(&(S)))) 104 #define ltohi(I) (*((uint_t *)(&(I)))) 105 #define htols(S) (*((ushort_t *)(&(S)))) 106 #define htoli(I) (*((uint_t *)(&(I)))) 107 108 #else 109 /* e.g. SPARC machines */ 110 #define getbyte(A, N) (((unsigned char *)(&(A)))[N]) 111 #define ltohs(S) ((getbyte(S, 1) << 8) | getbyte(S, 0)) 112 #define ltohi(I) ((getbyte(I, 3) << 24) | (getbyte(I, 2) << 16) | \ 113 (getbyte(I, 1) << 8) | getbyte(I, 0)) 114 #define htols(S) ((getbyte(S, 1) << 8) | getbyte(S, 0)) 115 #define htoli(I) ((getbyte(I, 3) << 24) | (getbyte(I, 2) << 16) | \ 116 (getbyte(I, 1) << 8) | getbyte(I, 0)) 117 #endif 118 119 #ifdef __cplusplus 120 } 121 #endif 122 123 #endif /* _SYS_FS_PC_LABEL_H */ 124