Theodore Ts'o | 3cb6c50 | 1997-08-11 20:29:22 +0000 | [diff] [blame] | 1 | /* |
| 2 | * v1.0 |
| 3 | * |
| 4 | * Disk I/O include file for the ext2fs/DOS library. |
| 5 | * |
| 6 | * Copyright (c) 1997 Mark Habersack |
Theodore Ts'o | 3cb6c50 | 1997-08-11 20:29:22 +0000 | [diff] [blame] | 7 | * |
Theodore Ts'o | 543547a | 2010-05-17 21:31:56 -0400 | [diff] [blame] | 8 | * %Begin-Header% |
| 9 | * This file may be redistributed under the terms of the GNU Library |
| 10 | * General Public License, version 2. |
| 11 | * %End-Header% |
Theodore Ts'o | 3cb6c50 | 1997-08-11 20:29:22 +0000 | [diff] [blame] | 12 | */ |
Theodore Ts'o | 543547a | 2010-05-17 21:31:56 -0400 | [diff] [blame] | 13 | |
Theodore Ts'o | 3cb6c50 | 1997-08-11 20:29:22 +0000 | [diff] [blame] | 14 | #ifndef __diskio_h |
| 15 | #define __diskio_h |
| 16 | #ifdef __TURBOC__ |
| 17 | #ifndef __LARGE__ |
| 18 | # error "ext2fs/DOS library requires LARGE model!" |
| 19 | #endif |
| 20 | #endif |
| 21 | |
| 22 | #ifdef __TURBOC__ |
| 23 | #include "msdos.h" |
| 24 | #endif |
| 25 | |
| 26 | /* |
| 27 | * A helper structure used in LBA => CHS conversion |
| 28 | */ |
| 29 | typedef struct |
| 30 | { |
| 31 | unsigned short cyl; /* Cylinder (or track) */ |
| 32 | unsigned short head; |
| 33 | unsigned short sector; |
| 34 | unsigned short offset; /* Offset of byte within the sector */ |
| 35 | } CHS; |
| 36 | |
| 37 | /* |
| 38 | * All partition data we need is here |
| 39 | */ |
| 40 | typedef struct |
| 41 | { |
| 42 | char *dev; /* _Linux_ device name (like "/dev/hda1") */ |
| 43 | unsigned char phys; /* Physical DOS drive number */ |
| 44 | unsigned long start; /* LBA address of partition start */ |
| 45 | unsigned long len; /* length of partition in sectors */ |
| 46 | unsigned char pno; /* Partition number (read from *dev) */ |
| 47 | |
| 48 | /* This partition's drive geometry */ |
| 49 | unsigned short cyls; |
| 50 | unsigned short heads; |
| 51 | unsigned short sects; |
| 52 | } PARTITION; |
| 53 | |
| 54 | /* |
| 55 | * PC partition table entry format |
| 56 | */ |
| 57 | #ifdef __DJGPP__ |
| 58 | #pragma pack(1) |
| 59 | #endif |
| 60 | typedef struct |
| 61 | { |
| 62 | unsigned char active; |
| 63 | unsigned char start_head; |
| 64 | unsigned char start_sec; |
| 65 | unsigned char start_cyl; |
| 66 | unsigned char type; |
| 67 | unsigned char end_head; |
| 68 | unsigned char end_sec; |
| 69 | unsigned char end_cyl; |
| 70 | unsigned long first_sec_rel; |
| 71 | unsigned long size; |
| 72 | } PTABLE_ENTRY; |
| 73 | #ifdef __DJGPP__ |
| 74 | #pragma pack() |
| 75 | #endif |
| 76 | |
| 77 | /* |
| 78 | * INT 0x13 operation codes |
| 79 | */ |
| 80 | #define DISK_READ 0x02 |
| 81 | #define DISK_WRITE 0x03 |
| 82 | #define DISK_GET_GEOMETRY 0x08 |
| 83 | #define DISK_READY 0x10 |
| 84 | |
| 85 | /* |
| 86 | * Errors to put in _dio_error |
| 87 | */ |
| 88 | #define ERR_BADDEV 0x00000001L |
| 89 | #define ERR_HARDWARE 0x00000002L |
| 90 | #define ERR_NOTSUPP 0x00000003L |
| 91 | #define ERR_NOTEXT2FS 0x00000004L |
| 92 | #define ERR_EMPTYPART 0x00000005L |
| 93 | #define ERR_LINUXSWAP 0x00000006L |
| 94 | |
| 95 | /* |
| 96 | * Functions in diskio.c |
| 97 | */ |
| 98 | |
| 99 | /* |
| 100 | * Variable contains last module's error |
| 101 | */ |
| 102 | extern unsigned long _dio_error; |
| 103 | |
| 104 | /* |
| 105 | * This one contains last hardware error (if _dio_error == ERR_HARDWARE) |
| 106 | */ |
| 107 | extern unsigned long _dio_hw_error; |
| 108 | |
| 109 | /* |
| 110 | * Macros to check for disk hardware errors |
| 111 | */ |
| 112 | #define HW_OK() ((unsigned char)_dio_hw_error == 0x00) |
| 113 | #define HW_BAD_CMD() ((unsigned char)_dio_hw_error == 0x01) |
| 114 | #define HW_NO_ADDR_MARK() ((unsigned char)_dio_hw_error == 0x02) |
| 115 | #define HW_WRITE_PROT() ((unsigned char)_dio_hw_error == 0x03) |
| 116 | #define HW_NO_SECTOR() ((unsigned char)_dio_hw_error == 0x04) |
| 117 | #define HW_RESET_FAIL() ((unsigned char)_dio_hw_error == 0x05) |
| 118 | #define HW_DISK_CHANGED() ((unsigned char)_dio_hw_error == 0x06) |
| 119 | #define HW_DRIVE_FAIL() ((unsigned char)_dio_hw_error == 0x07) |
| 120 | #define HW_DMA_OVERRUN() ((unsigned char)_dio_hw_error == 0x08) |
| 121 | #define HW_DMA_BOUNDARY() ((unsigned char)_dio_hw_error == 0x09) |
| 122 | #define HW_BAD_SECTOR() ((unsigned char)_dio_hw_error == 0x0A) |
| 123 | #define HW_BAD_TRACK() ((unsigned char)_dio_hw_error == 0x0B) |
| 124 | #define HW_UNSUPP_TRACK() ((unsigned char)_dio_hw_error == 0x0C) |
| 125 | #define HW_BAD_CRC_ECC() ((unsigned char)_dio_hw_error == 0x10) |
| 126 | #define HW_CRC_ECC_CORR() ((unsigned char)_dio_hw_error == 0x11) |
| 127 | #define HW_CONTR_FAIL() ((unsigned char)_dio_hw_error == 0x20) |
| 128 | #define HW_SEEK_FAIL() ((unsigned char)_dio_hw_error == 0x40) |
| 129 | #define HW_ATTACH_FAIL() ((unsigned char)_dio_hw_error == 0x80) |
| 130 | #define HW_DRIVE_NREADY() ((unsigned char)_dio_hw_error == 0xAA) |
| 131 | #define HW_UNDEF_ERROR() ((unsigned char)_dio_hw_error == 0xBB) |
| 132 | #define HW_WRITE_FAULT() ((unsigned char)_dio_hw_error == 0xCC) |
| 133 | #define HW_STATUS_ERROR() ((unsigned char)_dio_hw_error == 0xE0) |
| 134 | #define HW_SENSE_FAIL() ((unsigned char)_dio_hw_error == 0xFF) |
| 135 | |
| 136 | |
| 137 | /* |
| 138 | * Open the specified partition. |
| 139 | * String 'dev' must have a format: |
| 140 | * |
| 141 | * /dev/{sd|hd|fd}[X] |
| 142 | * |
| 143 | * where, |
| 144 | * |
| 145 | * only one of the option in curly braces can be used and X is an optional |
| 146 | * partition number for the given device. If X is not specified, function |
| 147 | * scans the drive's partition table in search for the first Linux ext2fs |
| 148 | * partition (signature 0x83). Along the way it dives into every extended |
| 149 | * partition encountered. |
| 150 | * Scan ends if either (a) there are no more used partition entries, or |
| 151 | * (b) there is no Xth partition. |
| 152 | * |
| 153 | * Routine returns 0 on success and !=0 otherwise. |
| 154 | */ |
| 155 | int open_partition(char *dev); |
| 156 | |
| 157 | #endif /* __diskio_h */ |