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Diffstat (limited to 'e2fslib/dosio.h')
| -rw-r--r-- | e2fslib/dosio.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/e2fslib/dosio.h b/e2fslib/dosio.h new file mode 100644 index 0000000..a0d652d --- /dev/null +++ b/e2fslib/dosio.h @@ -0,0 +1,153 @@ +/* + * 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 */ |