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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 */
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