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