#ifndef_DRIVER_H
#define_DRIVER_H
/* Format of generic request header block. Depending
* on the command code, data specific to the command is
* carried in data[] buffer ......... */
typedef struct request_block {
unsigned char length; //length of REQHDR
unsigned char unit; //unit # (block only)
unsigned char cmd; //command code
unsigned int status; //return status
unsigned char reserved[8];
unsigned char mtype; //media type
unsigned int xfer_ofs; //xfer buffer offset
unsigned int xfer_seg; // " " segment
unsigned int xfer_cnt; //bytes to xfer
unsigned char data[12]; //other command data
} REQHDR;
/* bit settings for upper byte of return
* status word in REQHDR .... */
#define IS_ERROR 0x8000
#define IM-BUSY 0x0200
#define IM_DONE 0x0100
/* values returned in lower byte of REQHDR status
* word if ERROR bit (bit 15) is set ..... */
#define WRITE_PROTECT 0x0000
#define INVALID_UNIT 0x0001
#define NOT_READY 0x0002
#define INV_COMMAND 0x0003
#define CRC_ERROR 0x0004
#define BAD_REQ_LENGTH 0x0005
#define SEEK_ERROR 0x0006
#define UNKNOWN_MEDIA 0x0007
#define INV_SECTOR 0x0008
#define OUT_OF_PAPER 0x0009
#define WRITE_FAULT 0x000A
#define READ_FAULT 0x000B
#define GENERAL_FAILURE 0x000C
#define INV_DISK_CHANGE 0x000F //DOS 3+ only
/* Bit settings for attribute word ........ */
#define IS_NUL 0x0004 //current NUL device
#define IS_CLOCK 0x0008 //current CLOCK device
#define GEN_IOCTL 0x0040 //generic ioctl: DOS 3.2+
#define OCR_MEDIA 0x0800 //open-close-remove media
#define IOCTL_RW 0x4000 //ioctl r/w supported (2+)
/* Attribute bits for character devices only ...... */
#define IS_STDIN 0x0001 //std input device
#define IS_STDOUT 0x0002 //std output device
#define USE_INT29H 0x0010 //CON device uses int 29h
/define OUTPUT_BUSY 0x2000 //uses output until busy
/define IS_CHAR 0x8000 //is character device
/* Attribute bits for block devices only .... */
#define BIG_SECTOR 0x0002 //32-bit sectors (DOS 4)
#define USE_BPB 0x2000 //use BPB for media info
#endif //__DRIVER_H
/* ------ End of File ----------------------- */