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