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1 /*
2  * v1.0
3  *
4  * Disk I/O include file for the ext2fs/DOS library.
5  *
6  * Copyright (c) 1997 Mark Habersack
7  *
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%
12  */
13 
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 */
158