hdreg.h

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#ifndef _LINUX_HDREG_H
#define _LINUX_HDREG_H

/**
*

 * This file contains some defines for the AT-hd-controller.
 * Various sources. Check out some definitions (see comments with
 * a ques).


*/

/// Hd controller regs. Ref: IBM AT Bios-listing 
#define HD_DATA         0x1f0   ///< _CTL when writing 
#define HD_ERROR        0x1f1   ///< see err-bits 
#define HD_NSECTOR      0x1f2   ///< nr of sectors to read/write 
#define HD_SECTOR       0x1f3   ///< starting sector 
#define HD_LCYL         0x1f4   ///< starting cylinder 
#define HD_HCYL         0x1f5   ///< high byte of starting cyl 
#define HD_CURRENT      0x1f6   ///< 101dhhhh , d=drive, hhhh=head 
#define HD_STATUS       0x1f7   ///< see status-bits 
#define HD_PRECOMP HD_ERROR     ///< same io address, read=error, write=precomp 
#define HD_COMMAND HD_STATUS    ///< same io address, read=status, write=cmd 

#define HD_CMD          0x3f6

/// Bits of HD_STATUS 
#define ERR_STAT        0x01
#define INDEX_STAT      0x02
#define ECC_STAT        0x04    ///< Corrected error 
#define DRQ_STAT        0x08
#define SEEK_STAT       0x10
#define WRERR_STAT      0x20
#define READY_STAT      0x40
#define BUSY_STAT       0x80

/// Values for HD_COMMAND 
#define WIN_RESTORE             0x10
#define WIN_READ                0x20
#define WIN_WRITE               0x30
#define WIN_VERIFY              0x40
#define WIN_FORMAT              0x50
#define WIN_INIT                0x60
#define WIN_SEEK                0x70
#define WIN_DIAGNOSE            0x90
#define WIN_SPECIFY             0x91

/// Bits for HD_ERROR 
#define MARK_ERR        0x01    ///< Bad address mark 
#define TRK0_ERR        0x02    ///< couldn't find track 0 
#define ABRT_ERR        0x04    ///< Command aborted 
#define ID_ERR          0x10    ///< ID field not found 
#define ECC_ERR         0x40    ///< Uncorrectable ECC error 
#define BBD_ERR         0x80    ///< block marked bad 


/**
*
 HDIO_GETGEO is the preferred choice - HDIO_REQ will be removed at some


*/
#define HDIO_REQ 0x301
#define HDIO_GETGEO 0x301
struct hd_geometry {
      unsigned char heads;
      unsigned char sectors;
      unsigned short cylinders;
      unsigned long start;
};
#endif

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