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- /*
- * v1.0
- *
- * Disk I/O include file for the ext2fs/DOS library.
- *
- * Copyright (c) 1997 Mark Habersack
- * This file may be distributed under the terms of the GNU Public License.
- *
- */
- #ifndef __diskio_h
- #define __diskio_h
- #ifdef __TURBOC__
- #ifndef __LARGE__
- # error "ext2fs/DOS library requires LARGE model!"
- #endif
- #endif
-
- #ifdef __TURBOC__
- #include "msdos.h"
- #endif
-
- /*
- * A helper structure used in LBA => CHS conversion
- */
- typedef struct
- {
- unsigned short cyl; /* Cylinder (or track) */
- unsigned short head;
- unsigned short sector;
- unsigned short offset; /* Offset of byte within the sector */
- } CHS;
-
- /*
- * All partition data we need is here
- */
- typedef struct
- {
- char *dev; /* _Linux_ device name (like "/dev/hda1") */
- unsigned char phys; /* Physical DOS drive number */
- unsigned long start; /* LBA address of partition start */
- unsigned long len; /* length of partition in sectors */
- unsigned char pno; /* Partition number (read from *dev) */
-
- /* This partition's drive geometry */
- unsigned short cyls;
- unsigned short heads;
- unsigned short sects;
- } PARTITION;
-
- /*
- * PC partition table entry format
- */
- #ifdef __DJGPP__
- #pragma pack(1)
- #endif
- typedef struct
- {
- unsigned char active;
- unsigned char start_head;
- unsigned char start_sec;
- unsigned char start_cyl;
- unsigned char type;
- unsigned char end_head;
- unsigned char end_sec;
- unsigned char end_cyl;
- unsigned long first_sec_rel;
- unsigned long size;
- } PTABLE_ENTRY;
- #ifdef __DJGPP__
- #pragma pack()
- #endif
-
- /*
- * INT 0x13 operation codes
- */
- #define DISK_READ 0x02
- #define DISK_WRITE 0x03
- #define DISK_GET_GEOMETRY 0x08
- #define DISK_READY 0x10
-
- /*
- * Errors to put in _dio_error
- */
- #define ERR_BADDEV 0x00000001L
- #define ERR_HARDWARE 0x00000002L
- #define ERR_NOTSUPP 0x00000003L
- #define ERR_NOTEXT2FS 0x00000004L
- #define ERR_EMPTYPART 0x00000005L
- #define ERR_LINUXSWAP 0x00000006L
-
- /*
- * Functions in diskio.c
- */
-
- /*
- * Variable contains last module's error
- */
- extern unsigned long _dio_error;
-
- /*
- * This one contains last hardware error (if _dio_error == ERR_HARDWARE)
- */
- extern unsigned long _dio_hw_error;
-
- /*
- * Macros to check for disk hardware errors
- */
- #define HW_OK() ((unsigned char)_dio_hw_error == 0x00)
- #define HW_BAD_CMD() ((unsigned char)_dio_hw_error == 0x01)
- #define HW_NO_ADDR_MARK() ((unsigned char)_dio_hw_error == 0x02)
- #define HW_WRITE_PROT() ((unsigned char)_dio_hw_error == 0x03)
- #define HW_NO_SECTOR() ((unsigned char)_dio_hw_error == 0x04)
- #define HW_RESET_FAIL() ((unsigned char)_dio_hw_error == 0x05)
- #define HW_DISK_CHANGED() ((unsigned char)_dio_hw_error == 0x06)
- #define HW_DRIVE_FAIL() ((unsigned char)_dio_hw_error == 0x07)
- #define HW_DMA_OVERRUN() ((unsigned char)_dio_hw_error == 0x08)
- #define HW_DMA_BOUNDARY() ((unsigned char)_dio_hw_error == 0x09)
- #define HW_BAD_SECTOR() ((unsigned char)_dio_hw_error == 0x0A)
- #define HW_BAD_TRACK() ((unsigned char)_dio_hw_error == 0x0B)
- #define HW_UNSUPP_TRACK() ((unsigned char)_dio_hw_error == 0x0C)
- #define HW_BAD_CRC_ECC() ((unsigned char)_dio_hw_error == 0x10)
- #define HW_CRC_ECC_CORR() ((unsigned char)_dio_hw_error == 0x11)
- #define HW_CONTR_FAIL() ((unsigned char)_dio_hw_error == 0x20)
- #define HW_SEEK_FAIL() ((unsigned char)_dio_hw_error == 0x40)
- #define HW_ATTACH_FAIL() ((unsigned char)_dio_hw_error == 0x80)
- #define HW_DRIVE_NREADY() ((unsigned char)_dio_hw_error == 0xAA)
- #define HW_UNDEF_ERROR() ((unsigned char)_dio_hw_error == 0xBB)
- #define HW_WRITE_FAULT() ((unsigned char)_dio_hw_error == 0xCC)
- #define HW_STATUS_ERROR() ((unsigned char)_dio_hw_error == 0xE0)
- #define HW_SENSE_FAIL() ((unsigned char)_dio_hw_error == 0xFF)
-
-
- /*
- * Open the specified partition.
- * String 'dev' must have a format:
- *
- * /dev/{sd|hd|fd}[X]
- *
- * where,
- *
- * only one of the option in curly braces can be used and X is an optional
- * partition number for the given device. If X is not specified, function
- * scans the drive's partition table in search for the first Linux ext2fs
- * partition (signature 0x83). Along the way it dives into every extended
- * partition encountered.
- * Scan ends if either (a) there are no more used partition entries, or
- * (b) there is no Xth partition.
- *
- * Routine returns 0 on success and !=0 otherwise.
- */
- int open_partition(char *dev);
-
- #endif /* __diskio_h */
-