FreeBSD/Linux Kernel Cross Reference
sys/pc/floppy.h

     typedef struct FController FController;
     typedef struct FDrive FDrive;
     typedef struct FType FType;
     
     static void floppyintr(Ureg*);
     static int floppyon(FDrive*);
     static void floppyoff(FDrive*);
     static void floppysetdef(FDrive*);
     
    /*
     *  a floppy drive
     */
    struct FDrive
    {
            FType   *t;             /* floppy type */
            int     dt;             /* drive type */
            int     dev;
    
            ulong   lasttouched;    /* time last touched */
            int     cyl;            /* current arm position */
            int     confused;       /* needs to be recalibrated */
            int     vers;
            int     maxtries;       /* max read attempts before Eio */
    
            int     tcyl;           /* target cylinder */
            int     thead;          /* target head */
            int     tsec;           /* target sector */
            long    len;            /* size of xfer */
    
            uchar   *cache;         /* track cache */
            int     ccyl;
            int     chead;
    };
    
    /*
     *  controller for 4 floppys
     */
    struct FController
    {
            QLock;                  /* exclusive access to the contoller */
    
            int     ndrive;
            FDrive  *d;             /* the floppy drives */
            FDrive  *selected;
            int     rate;           /* current rate selected */
            uchar   cmd[14];        /* command */
            int     ncmd;           /* # command bytes */
            uchar   stat[14];       /* command status */
            int     nstat;          /* # status bytes */
            int     confused;       /* controler needs to be reset */
            Rendez  r;              /* wait here for command termination */
            int     motor;          /* bit mask of spinning disks */
    };
    
    /*
     *  floppy types (all MFM encoding)
     */
    struct FType
    {
            char    *name;
            int     dt;             /* compatible drive type */
            int     bytes;          /* bytes/sector */
            int     sectors;        /* sectors/track */
            int     heads;          /* number of heads */
            int     steps;          /* steps per cylinder */
            int     tracks;         /* tracks/disk */
            int     gpl;            /* intersector gap length for read/write */     
            int     fgpl;           /* intersector gap length for format */
            int     rate;           /* rate code */
    
            /*
             *  these depend on previous entries and are set filled in
             *  by floppyinit
             */
            int     bcode;          /* coded version of bytes for the controller */
            long    cap;            /* drive capacity in bytes */
            long    tsize;          /* track size in bytes */
    };
    /* bits in the registers */
    enum
    {
            /* status registers a & b */
            Psra=           0x3f0,
            Psrb=           0x3f1,
    
            /* digital output register */
            Pdor=           0x3f2,
            Fintena=        0x8,    /* enable floppy interrupt */
            Fena=           0x4,    /* 0 == reset controller */
    
            /* main status register */
            Pmsr=           0x3f4,
            Fready=         0x80,   /* ready to be touched */
            Ffrom=          0x40,   /* data from controller */
            Ffloppybusy=    0x10,   /* operation not over */
    
            /* data register */
            Pfdata=         0x3f5,
            Frecal=         0x07,   /* recalibrate cmd */
           Fseek=          0x0f,   /* seek cmd */
           Fsense=         0x08,   /* sense cmd */
           Fread=          0x66,   /* read cmd */
           Freadid=        0x4a,   /* read track id */
           Fspec=          0x03,   /* set hold times */
           Fwrite=         0x45,   /* write cmd */
           Fformat=        0x4d,   /* format cmd */
           Fmulti=         0x80,   /* or'd with Fread or Fwrite for multi-head */
           Fdumpreg=       0x0e,   /* dump internal registers */
   
           /* digital input register */
           Pdir=           0x3F7,  /* disk changed port (read only) */
           Pdsr=           0x3F7,  /* data rate select port (write only) */
           Fchange=        0x80,   /* disk has changed */
   
           /* status 0 byte */
           Drivemask=      3<<0,
           Seekend=        1<<5,
           Codemask=       (3<<6)|(3<<3),
           Cmdexec=        1<<6,
   
           /* status 1 byte */
           Overrun=        0x10,
   };
   
   
   static void
   pcfloppyintr(Ureg *ur, void *a)
   {
           USED(a);
   
           floppyintr(ur);
   }
   
   void
   floppysetup0(FController *fl)
   {
           fl->ndrive = 0;
           if(ioalloc(Psra, 6, 0, "floppy") < 0)
                   return;
           if(ioalloc(Pdir, 1, 0, "floppy") < 0){
                   iofree(Psra);
                   return;
           }
           fl->ndrive = 2;
   }
   
   void
   floppysetup1(FController *fl)
   {
           uchar equip;
   
           /*
            *  read nvram for types of floppies 0 & 1
            */
           equip = nvramread(0x10);
           if(fl->ndrive > 0){
                   fl->d[0].dt = (equip >> 4) & 0xf;
                   floppysetdef(&fl->d[0]);
           }
           if(fl->ndrive > 1){
                   fl->d[1].dt = equip & 0xf;
                   floppysetdef(&fl->d[1]);
           }
           intrenable(IrqFLOPPY, pcfloppyintr, fl, BUSUNKNOWN, "floppy");
   }
   
   /*
    *  eject disk ( unknown on safari )
    */
   void
   floppyeject(FDrive *dp)
   {
           floppyon(dp);
           dp->vers++;
           floppyoff(dp);
   }
   
   int 
   floppyexec(char *a, long b, int c)
   {
           USED(a, b, c);
           return b;
   }

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