4 * Disk I/O include file for the ext2fs/DOS library.
6 * Copyright (c) 1997 Mark Habersack
7 * This file may be distributed under the terms of the GNU Public License.
14 # error "ext2fs/DOS library requires LARGE model!"
23 * A helper structure used in LBA => CHS conversion
27 unsigned short cyl; /* Cylinder (or track) */
29 unsigned short sector;
30 unsigned short offset; /* Offset of byte within the sector */
34 * All partition data we need is here
38 char *dev; /* _Linux_ device name (like "/dev/hda1") */
39 unsigned char phys; /* Physical DOS drive number */
40 unsigned long start; /* LBA address of partition start */
41 unsigned long len; /* length of partition in sectors */
42 unsigned char pno; /* Partition number (read from *dev) */
44 /* This partition's drive geometry */
51 * PC partition table entry format
59 unsigned char start_head;
60 unsigned char start_sec;
61 unsigned char start_cyl;
63 unsigned char end_head;
64 unsigned char end_sec;
65 unsigned char end_cyl;
66 unsigned long first_sec_rel;
74 * INT 0x13 operation codes
76 #define DISK_READ 0x02
77 #define DISK_WRITE 0x03
78 #define DISK_GET_GEOMETRY 0x08
79 #define DISK_READY 0x10
82 * Errors to put in _dio_error
84 #define ERR_BADDEV 0x00000001L
85 #define ERR_HARDWARE 0x00000002L
86 #define ERR_NOTSUPP 0x00000003L
87 #define ERR_NOTEXT2FS 0x00000004L
88 #define ERR_EMPTYPART 0x00000005L
89 #define ERR_LINUXSWAP 0x00000006L
92 * Functions in diskio.c
96 * Variable contains last module's error
98 extern unsigned long _dio_error;
101 * This one contains last hardware error (if _dio_error == ERR_HARDWARE)
103 extern unsigned long _dio_hw_error;
106 * Macros to check for disk hardware errors
108 #define HW_OK() ((unsigned char)_dio_hw_error == 0x00)
109 #define HW_BAD_CMD() ((unsigned char)_dio_hw_error == 0x01)
110 #define HW_NO_ADDR_MARK() ((unsigned char)_dio_hw_error == 0x02)
111 #define HW_WRITE_PROT() ((unsigned char)_dio_hw_error == 0x03)
112 #define HW_NO_SECTOR() ((unsigned char)_dio_hw_error == 0x04)
113 #define HW_RESET_FAIL() ((unsigned char)_dio_hw_error == 0x05)
114 #define HW_DISK_CHANGED() ((unsigned char)_dio_hw_error == 0x06)
115 #define HW_DRIVE_FAIL() ((unsigned char)_dio_hw_error == 0x07)
116 #define HW_DMA_OVERRUN() ((unsigned char)_dio_hw_error == 0x08)
117 #define HW_DMA_BOUNDARY() ((unsigned char)_dio_hw_error == 0x09)
118 #define HW_BAD_SECTOR() ((unsigned char)_dio_hw_error == 0x0A)
119 #define HW_BAD_TRACK() ((unsigned char)_dio_hw_error == 0x0B)
120 #define HW_UNSUPP_TRACK() ((unsigned char)_dio_hw_error == 0x0C)
121 #define HW_BAD_CRC_ECC() ((unsigned char)_dio_hw_error == 0x10)
122 #define HW_CRC_ECC_CORR() ((unsigned char)_dio_hw_error == 0x11)
123 #define HW_CONTR_FAIL() ((unsigned char)_dio_hw_error == 0x20)
124 #define HW_SEEK_FAIL() ((unsigned char)_dio_hw_error == 0x40)
125 #define HW_ATTACH_FAIL() ((unsigned char)_dio_hw_error == 0x80)
126 #define HW_DRIVE_NREADY() ((unsigned char)_dio_hw_error == 0xAA)
127 #define HW_UNDEF_ERROR() ((unsigned char)_dio_hw_error == 0xBB)
128 #define HW_WRITE_FAULT() ((unsigned char)_dio_hw_error == 0xCC)
129 #define HW_STATUS_ERROR() ((unsigned char)_dio_hw_error == 0xE0)
130 #define HW_SENSE_FAIL() ((unsigned char)_dio_hw_error == 0xFF)
134 * Open the specified partition.
135 * String 'dev' must have a format:
141 * only one of the option in curly braces can be used and X is an optional
142 * partition number for the given device. If X is not specified, function
143 * scans the drive's partition table in search for the first Linux ext2fs
144 * partition (signature 0x83). Along the way it dives into every extended
145 * partition encountered.
146 * Scan ends if either (a) there are no more used partition entries, or
147 * (b) there is no Xth partition.
149 * Routine returns 0 on success and !=0 otherwise.
151 int open_partition(char *dev);
153 #endif /* __diskio_h */