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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  * This file may be distributed under the terms of the GNU Public License.
      8  *
      9  */
     10 #ifndef __diskio_h
     11 #define __diskio_h
     12 #ifdef __TURBOC__
     13 #ifndef __LARGE__
     14 # error "ext2fs/DOS library requires LARGE model!"
     15 #endif
     16 #endif
     17 
     18 #ifdef __TURBOC__
     19 #include "msdos.h"
     20 #endif
     21 
     22 /*
     23  * A helper structure used in LBA => CHS conversion
     24  */
     25 typedef struct
     26 {
     27   unsigned short       cyl;     /* Cylinder (or track) */
     28   unsigned short       head;
     29   unsigned short       sector;
     30   unsigned short       offset;  /* Offset of byte within the sector */
     31 } CHS;
     32 
     33 /*
     34  * All partition data we need is here
     35  */
     36 typedef struct
     37 {
     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) */
     43 
     44   /* This partition's drive geometry */
     45   unsigned short       cyls;
     46   unsigned short       heads;
     47   unsigned short       sects;
     48 } PARTITION;
     49 
     50 /*
     51  * PC partition table entry format
     52  */
     53 #ifdef __DJGPP__
     54 #pragma pack(1)
     55 #endif
     56 typedef struct
     57 {
     58   unsigned char        active;
     59   unsigned char        start_head;
     60   unsigned char        start_sec;
     61   unsigned char        start_cyl;
     62   unsigned char        type;
     63   unsigned char        end_head;
     64   unsigned char        end_sec;
     65   unsigned char        end_cyl;
     66   unsigned long        first_sec_rel;
     67   unsigned long        size;
     68 } PTABLE_ENTRY;
     69 #ifdef __DJGPP__
     70 #pragma pack()
     71 #endif
     72 
     73 /*
     74  * INT 0x13 operation codes
     75  */
     76 #define DISK_READ          0x02
     77 #define DISK_WRITE         0x03
     78 #define DISK_GET_GEOMETRY  0x08
     79 #define DISK_READY         0x10
     80 
     81 /*
     82  * Errors to put in _dio_error
     83  */
     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
     90 
     91 /*
     92  * Functions in diskio.c
     93  */
     94 
     95 /*
     96  * Variable contains last module's error
     97  */
     98 extern unsigned long        _dio_error;
     99 
    100 /*
    101  * This one contains last hardware error (if _dio_error == ERR_HARDWARE)
    102  */
    103 extern unsigned long        _dio_hw_error;
    104 
    105 /*
    106  * Macros to check for disk hardware errors
    107  */
    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)
    131 
    132 
    133 /*
    134  * Open the specified partition.
    135  * String 'dev' must have a format:
    136  *
    137  *  /dev/{sd|hd|fd}[X]
    138  *
    139  * where,
    140  *
    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.
    148  *
    149  * Routine returns 0 on success and !=0 otherwise.
    150  */
    151 int open_partition(char *dev);
    152 
    153 #endif /* __diskio_h */
    154