158 lines
4.6 KiB
C
158 lines
4.6 KiB
C
/*
|
|
* v1.0
|
|
*
|
|
* Disk I/O include file for the ext2fs/DOS library.
|
|
*
|
|
* Copyright (c) 1997 Mark Habersack
|
|
*
|
|
* %Begin-Header%
|
|
* This file may be redistributed under the terms of the GNU Library
|
|
* General Public License, version 2.
|
|
* %End-Header%
|
|
*/
|
|
|
|
#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 */
|