FreeBSD/Linux Kernel Cross Reference
sys/sys/fdcio.h

     /*
      * Copyright (C) 1992-1994,2001 by Joerg Wunsch, Dresden
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY
     * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
     * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
     * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
     * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
     * DAMAGE.
     *
     * $FreeBSD: releng/5.1/sys/sys/fdcio.h 87992 2001-12-15 19:09:04Z joerg $
     */
    
    #ifndef _MACHINE_IOCTL_FD_H_
    #define _MACHINE_IOCTL_FD_H_
    
    #ifndef _KERNEL
    #include <sys/types.h>
    #endif
    #include <sys/ioccom.h>
    
    #define FD_FORMAT_VERSION 110   /* used to validate before formatting */
    #define FD_MAX_NSEC 36          /* highest known number of spt - allow for */
                                    /* 2.88 MB drives */
    
    struct fd_formb {
            int format_version;     /* == FD_FORMAT_VERSION */
            int cyl, head;
            int transfer_rate;      /* FDC_???KBPS */
    
            union {
                    struct fd_form_data {
                            /*
                             * DO NOT CHANGE THE LAYOUT OF THIS STRUCTS
                             * it is hardware-dependent since it exactly
                             * matches the byte sequence to write to FDC
                             * during its `format track' operation
                             */
                            u_char secshift; /* 0 -> 128, ...; usually 2 -> 512 */
                            u_char nsecs;   /* must be <= FD_MAX_NSEC */
                            u_char gaplen;  /* GAP 3 length; usually 84 */
                            u_char fillbyte; /* usually 0xf6 */
                            struct fd_idfield_data {
                                    /*
                                     * data to write into id fields;
                                     * for obscure formats, they mustn't match
                                     * the real values (but mostly do)
                                     */
                                    u_char cylno;   /* 0 thru 79 (or 39) */
                                    u_char headno;  /* 0, or 1 */
                                    u_char secno;   /* starting at 1! */
                                    u_char secsize; /* usually 2 */
                            } idfields[FD_MAX_NSEC]; /* 0 <= idx < nsecs used */
                    } structured;
                    u_char raw[1];  /* to have continuous indexed access */
            } format_info;
    };
    
    /* make life easier */
    # define fd_formb_secshift   format_info.structured.secshift
    # define fd_formb_nsecs      format_info.structured.nsecs
    # define fd_formb_gaplen     format_info.structured.gaplen
    # define fd_formb_fillbyte   format_info.structured.fillbyte
    /* these data must be filled in for(i = 0; i < fd_formb_nsecs; i++) */
    # define fd_formb_cylno(i)   format_info.structured.idfields[i].cylno
    # define fd_formb_headno(i)  format_info.structured.idfields[i].headno
    # define fd_formb_secno(i)   format_info.structured.idfields[i].secno
    # define fd_formb_secsize(i) format_info.structured.idfields[i].secsize
    
    struct fd_type {
            int     sectrac;                /* sectors per track         */
            int     secsize;                /* size code for sectors     */
            int     datalen;                /* data len when secsize = 0 */
            int     gap;                    /* gap len between sectors   */
            int     tracks;                 /* total number of cylinders */
            int     size;                   /* size of disk in sectors   */
            int     trans;                  /* transfer speed code       */
            int     heads;                  /* number of heads           */
            int     f_gap;                  /* format gap len            */
            int     f_inter;                /* format interleave factor  */
            int     offset_side2;           /* offset of sectors on side2 */
            int     flags;                  /* misc. features */
    #define FL_MFM          0x0001          /* MFM recording */
   #define FL_2STEP        0x0002          /* 2 steps between cylinders */
   #define FL_PERPND       0x0004          /* perpendicular recording */
   };
   
   struct fdc_status {
           u_int   status[7];
   };
   
   /*
    * cyl and head are being passed into ioctl(FD_READID)
    * all four fields are being returned
    */
   struct fdc_readid {
           u_char  cyl;            /* C - 0...79 */
           u_char  head;           /* H - 0...1 */
           u_char  sec;            /* R - 1...n */
           u_char  secshift;       /* N - log2(secsize / 128) */
   };
   
   /*
    * Diskette drive type, basically the same as stored in RTC on ISA
    * machines (see /sys/isa/rtc.h), but right-shifted by four bits.
    */
   enum fd_drivetype {
           FDT_NONE, FDT_360K, FDT_12M, FDT_720K, FDT_144M, FDT_288M_1,
           FDT_288M
   };
   
   
   #define FD_FORM   _IOW('F', 61, struct fd_formb) /* format a track */
   #define FD_GTYPE  _IOR('F', 62, struct fd_type)  /* get drive type */
   #define FD_STYPE  _IOW('F', 63, struct fd_type)  /* set drive type */
   
   #define FD_GOPTS  _IOR('F', 64, int) /* drive options, see below */
   #define FD_SOPTS  _IOW('F', 65, int)
   
   #define FD_DEBUG  _IOW('F', 66, int)
   
   #define FD_CLRERR _IO('F', 67)  /* clear error counter */
   
   #define FD_READID _IOWR('F', 68, struct fdc_readid) /* read ID field */
   
   /*
    * Obtain NE765 status registers.  Only successful if there is
    * a valid status stored in fdc->status[].
    */
   #define FD_GSTAT  _IOR('F', 69, struct fdc_status)
   
   #define FD_GDTYPE _IOR('F', 70, enum fd_drivetype) /* obtain drive type */
   
   /* Options for FD_GOPTS/FD_SOPTS, cleared on device close */
   #define FDOPT_NORETRY 0x0001    /* no retries on failure */
   #define FDOPT_NOERRLOG 0x002    /* no "hard error" kernel log messages */
   #define FDOPT_NOERROR 0x0004    /* do not indicate errors, caller will use
                                      FD_GSTAT in order to obtain status */
   #define FDOPT_AUTOSEL 0x8000    /* read/only option: device performs media
                                    * autoselection */
   
   /*
    * Transfer rate definitions.  Used in the structures above.  They
    * represent the hardware encoding of bits 0 and 1 of the FDC control
    * register when writing to the register.
    * Transfer rates for FM encoding are half the values listed here
    * (but we currently don't support FM encoding).
    */
   #define FDC_500KBPS     0x00    /* 500KBPS MFM drive transfer rate */
   #define FDC_300KBPS     0x01    /* 300KBPS MFM drive transfer rate */
   #define FDC_250KBPS     0x02    /* 250KBPS MFM drive transfer rate */
   #define FDC_1MBPS       0x03    /* 1MPBS MFM drive transfer rate */
   
   #endif /* !_MACHINE_IOCTL_FD_H_ */

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