FreeBSD/Linux Kernel Cross Reference
sys/i386ps2/fd.c

     /* 
      * Mach Operating System
      * Copyright (c) 1993,1991 Carnegie Mellon University
      * Copyright (c) 1991 IBM Corporation 
      * All Rights Reserved.
      * 
      * Permission to use, copy, modify and distribute this software and its
      * documentation is hereby granted, provided that both the copyright
      * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation,
     * and that the name IBM not be used in advertising or publicity 
     * pertaining to distribution of the software without specific, written
     * prior permission.
     * 
     * CARNEGIE MELLON AND IBM ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON AND IBM DISCLAIM ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    
    /*
     * HISTORY
     * $Log:        fd.c,v $
     * Revision 2.5  93/12/07  13:53:45  dbg
     *      Removed UNTIMEOUT and wait calls from fdabios_init, since it is
     *      called at probe time (when neither thread services nor timeouts
     *      are available).  They're not necessary, since the called ABIOS
     *      functions always return.  I should really arrange to attach the
     *      clock before calling the floppy probe, but that will have to
     *      wait.
     *      [93/12/07            dbg]
     * 
     * Revision 2.4  93/11/17  16:52:44  dbg
     *      A tiny bit of delinting.  It needs a lot more.
     *      [93/10/29            dbg]
     * 
     * Revision 2.3  93/03/11  14:08:53  danner
     *      u_long -> u_int
     *      [93/03/09            danner]
     * 
     * Revision 2.2  93/02/04  07:59:23  danner
     *      Disable media-change detection for the floppy to allow booting
     *      from them in the microkernel world.
     *      [93/01/18            zon]
     * 
     *      Integrate PS2 code from IBM.
     *      [93/01/18            prithvi]
     * 
     */
    
    /*
     * COMPONENT_NAME: (FLOPPY) Mach 3.0 PS/2 Floppy Driver  
     *
     * FUNCTIONS: 
     *
     * ORIGINS: 27
     */                                                                   
    
    /*  OSF/1 PS/2 ABIOS diskette driver.  Driver lineage: AIX v3 R2 -> AIX v3 PS/2
     * -> OSF/1 PS/2.
     */
    
    
    /* Changed for the 3.0 port */
    
    #include <fd.h>
    
    #ifdef  MACH_KERNEL 
    #include <sys/types.h>
    #include <device/io_req.h>
    #include <device/buf.h>
    #include <device/errno.h>
    #include <i386/pmap.h>
    #include <sys/ioctl.h>
    #include <sys/syslog.h>
    #include <i386ps2/abios.h>
    #include <i386/ipl.h>
    #include <i386ps2/bus.h>
    #include <i386ps2/debugf.h>
    #include <i386ps2/fd_abios.h>
    #include <i386ps2/fdreg.h>
    #define PRIBIO          20  /* taken from i386at/m765.h */
    #else   /* MACH_KERNEL */
    #include <sys/types.h>
    #include <sys/buf.h>
    #include <sys/errno.h>
    #ifdef OSF
    #include <sys/fcntl.h>
    #else
   #include <sys/file.h>
   #endif /* OSF */
   #include <i386/pmap.h>
   #include <sys/ioctl.h>
   #include <sys/param.h>
   #include <sys/proc.h>
   #include <sys/syslog.h>
   #include <sys/uio.h>
   #include <sys/user.h>
   #include <i386ps2/abios.h>
   #include <i386/ipl.h>
   #include <kern/assert.h>
   #include <kern/task.h>
   #ifdef OSF
   #include <i386/handler.h>
   #endif /* OSF */
   #include <i386ps2/bus.h>
   #include "debugf.h"
   #include "fd_abios.h"
   #include "fdreg.h"
   #include "fd.h"
   #endif  /* MACH_KERNEL */
   
   extern int hz;
   
   extern hd_delay(int);
   
   #define HZ      hz
   
   #if defined(FDDEBUG) && !defined(DEBUG)
   #define DEBUG   1
   #endif
   
   #ifdef DEBUG
   int fddebug = 0;
   #define FDDEBUG(cond,args) if (cond) (args)
   #define FDINIT          (fddebug & DEBUG_CONFIG)
   #define FDOPEN          (fddebug & DEBUG_OPEN)
   #define FDCLOSE         (fddebug & DEBUG_CLOSE)
   #define FDREAD          (fddebug & DEBUG_READ)
   #define FDWRITE         (fddebug & DEBUG_WRITE)
   #define FDSTRAT         (fddebug & DEBUG_STRATEGY)
   #define FDINTR          (fddebug & DEBUG_INTR)
   #define FDIOCTL         (fddebug & DEBUG_IOCTL)
   #define FDCMD           (fddebug & BIT16)
   #define FDSTAT          (fddebug & BIT9)
   #define FDABIOS         (fddebug & DEBUG_ABIOS)
   #define FDSTUB          (fddebug & BIT17)
   #define FDDETAIL        (fddebug & DEBUG_ERR_COND)
   #else
   #define FDDEBUG(cond,args)
   #endif
   
   struct buf *geteblk();          /* Added for Mach 3.0  */
   
   /* Changed for the 3.0 port */
   
   #ifdef  MACH_KERNEL
   int fdopen(), fdclose(), fdread(), fdwrite(), fdstrategy(), fdintr();
   #else   /* MACH_KERNEL */
   int fdopen(), fdclose(), fdread(), fdwrite(), fdstrategy(), fdioctl();
   int fdintr();
   #endif  /* MACH_KERNEL */
   
   /* Additional internal device driver routines. 
   */
   int  fd_iocformat(dev_t, long, struct floppy *);
   int  fd_iocsinfo(struct floppy *, long);
   static void fd_sched(struct floppy *);
   void fd_stot();
   static int fdcall_abios(int, struct Fd_request *);
   static int fdcall_abios_poll(int, struct Fd_request *, int);
   int  fdcheck_sequence(struct floppy *);
   static void fdcleanup(struct floppy *);
   static int fdcommon_intr(struct Fd_request *);
   int  fddisk_changed(struct floppy *);
   int  fddoor_check(struct floppy *,int);
   int  fderror(struct floppy *);
   static int  fdexecute_command(struct floppy *, int);
   static void fdget_adapter();
   static void fdio(struct buf *);
   static void fdiodone(struct buf *, struct Fd_request *, struct floppy *, int);
   static int  fdissue_command(struct floppy *, int);
   static int  fdload_floppy(struct floppy *, int);
   int  fdmincnt(struct buf *);
   int  fdsettle_test(struct floppy *, int);
   static int  fdsetup_transfer(struct floppy *);
   int  fdspeed_test(struct floppy *);
   int  fdstage1_config(dev_t);
   void fdtimer(struct fdwatchdog *);
   static void fdlog_error();
   static int d_max_page();
   void fd_error_decode(
           int     code,
           char    *msg);
   
   /* Macros:
   */
   #define fdtype(fdp)             fdload_floppy(fdp,FDRMEDIA_PARMS)
   #define fdstartio(fdp)          fdexecute_command(fdp,\
                   (fdp->headptr->b_flags&B_READ) ? FDREAD_DATA : FDWRITE_DATA);
   
   #define fd_no_retry(fdp)        (fdp)->retry_count = FDMAXRETRIES;
   #define fd_clear_retry(fdp)     (fdp)->retry_count = \
                                   ((fdp)->retry_flag == TRUE) ? 0 : FDMAXRETRIES;
   
   /* Changed for the 3.0 Port */
   
   #ifdef  MACH_KERNEL             
   #define get_pmap(bp)            (kernel_pmap)
   #else   /* MACH_KERNEL */
   #define get_pmap(bp)            ( ((bp)->b_proc) ?\
                                           (bp)->b_proc->task->map->pmap :\
                                           kernel_pmap )
   #endif  /* MACH_KERNEL */
   
   
   #define NS_PER_TICK     (1000000000/HZ)
   #define NS_TO_TICKS(x)  ((x + (NS_PER_TICK - 1)) / NS_PER_TICK)
   #define us2tics(us)     NS_TO_TICKS( ((us) * 1000) )    /* us -> ticks */
   
   /* Global vars:
   */
   static struct adapter_structure fdadapter;
   static struct floppy floppies[FDMAXDRIVES];
   static struct buf fdbp[FDMAXDRIVES];
   
   #ifdef OSF
   static  ihandler_t      fd_handler;
   static  ihandler_id_t   *fd_handler_id;
   #endif /* OSF */
   
   static struct fd_data fd_data[] = {
           { 18, 80, 2, 27, 108, 255 },            /* FDLOAD_144 */
           { 9, 80, 2, 42, 80, 255 },              /* FDLOAD_720 */
           { 9, 40, 2, 42, 80, 255 }               /* FDLOAD_360 */
   };
   
   static int fddrive_val[FDMAXDRIVES] = {
           FDDRIVE0,
           FDDRIVE1
   };
   
   static char *fd_tmp_errors[] = {
           "unsupported drive type",       /* FD_UNSUP_DRIVE       */
           "unknown bytes/sector",         /* FD_UNSUP_SECT        */
           "unsupported minor",            /* FD_UNSUP_MINOR       */
           "lost interrupt",               /* FD_ERR_LOSTINT       */
           "media not present",            /* FD_ERR_NOMEDIA       */
           "media bad",                    /* FD_ERR_RETRY         */
           "media changed"                 /* FD_ERR_CHMEDIA       */
   };
   
   int fdprobe(), fdslave(), fdattach();
   
   int (*fdcintrs[])() = { fdintr, 0};
   
   struct i386_dev *fdinfo[NFD];
   struct i386_ctlr *fdcinfo[NFDC];
   
   struct  i386_driver      fdcdriver = {
           /* probe slave    attach   dname  dinfo   mname  minfo */
           fdprobe, fdslave, fdattach, "fd", fdinfo, "fdc", fdcinfo };
   
   #ifdef DEBUG
   #define MAX_ABIOS_FUNCTION_NAMES        (sizeof abios_function_names/ sizeof abios_function_names[0])
   static char *abios_function_names[] =  {
           "def_int", "ret_log_id_param",                          /* 0 - 1 */
           "reserved", "read_dev_param",                           /* 2 - 3 */
           "set_dev_param", "reset",                               /* 4 - 5 */
           "enable", "disable",                                    /* 6 - 7 */
           "read", "write",                                        /* 8 - 9 */
           "write-verify", "verify",                               /* a - b */
           "read-media-type", "set-media-type",                    /* c - d */
           "change-signal-status", "motor-off"                     /* e - f */
           "int-status"                                            /* 10    */
   };
   
   #define ABIOS_FUNCTION_NAME(fn) ((unsigned) (fn) < MAX_ABIOS_FUNCTION_NAMES ? abios_function_names[fn] : "unknown")
   #endif /* DEBUG */
   
   /*
    * TODO: 
    * call fdinit here so that we can set up interrupts properly before
    * open is called. Can't do it now because fdexecute_command currently
    * will sleep which appears to be a no-no at this stage.
    */
   
   fdprobe(addr,ctlr)
   struct i386_ctlr *ctlr;
   {
           return(fdinit(ctlr) == FDSUCCESS);
   }
   
   /*
    * determine if the given slave (unit) is present
    */
   fdslave(iod)
   struct i386_dev *iod;
   {
       if (iod->dev_slave >= fdadapter.fd_numd)
           return(0);              /* no such drive */
       return(1);
   }
   
   fdattach(iod)
   struct i386_dev *iod;
   {
   }
   
   
   int 
   fdinit(ctlr)
   struct i386_ctlr *ctlr;
   {
     struct floppy *fdp = &floppies[0];
     int i, rc;
   
     FDDEBUG(FDINIT,printf("fdinit: start\n"));
   
     printf("IBM ABIOS Floppy Disk Driver Ver : 1.1\n");
   
   
     /* Initialize the adapter struture
     */
     fdadapter.fdintr_status = FDFREE;
     fdadapter.need_controller = FALSE;
     fdadapter.int_wd.func = NULL;
     fdadapter.mot_wd.func = NULL;
     fdadapter.need_sleep = 0;             /* NEEDS WORK -- needed ? */
   
   
     /* Initialize each floppy structure
      */
     for (i = 0; i < FDMAXDRIVES; i++) {
       floppies[i].drive_state = FDSTAT_CLOS;
       floppies[i].headptr = NULL;
       floppies[i].tailptr = NULL;
       floppies[i].close_sleep = 0;        /* NEEDS WORK -- sleep on? */
       floppies[i].timeout_flag = FALSE;
       floppies[i].retry_flag = TRUE;
       floppies[i].read_count_bytes = 0;
       floppies[i].read_count_megabytes = 0;
       floppies[i].write_count_bytes = 0;
       floppies[i].write_count_megabytes = 0;
       floppies[i].open_check = FALSE;
       floppies[i].motor_off_time = 10;
   
       /* NEEDS WORK: THE FOLLOWING CAN PROBABLY GO AWAY! */
       floppies[i].drive_type = D_135H;
       floppies[i].head_settle_time = 0;
       floppies[i].motor_start = 0;
     }
   
     fdadapter.int_wd.time = 5 * HZ;       /* 5 second interrupt watchdog */
     fdadapter.int_wd.func = fdtimer;
     fdadapter.int_wd.type = FDINT_WD;
   
     /* 10 second motor off watchdog
      */
     fdadapter.mot_wd.time = fdp->motor_off_time * HZ;
     fdadapter.mot_wd.func = fdtimer;
     fdadapter.mot_wd.type = FDMOT_WD;
   
     /*  Do initialization of ABIOS structures.  This must
      * be done before int_enable() and ABIOS_RESET.
      *
      * Note: we can set FDBUSY because we are resetting
      *     the adapter and there can't be any other 
      *     activity on the floppy.
      */
     fdadapter.fdintr_status = FDBUSY;
   
   
   #ifdef  MACH_KERNEL
     rc = fdabios_init(fdp);
   #else   /* MACH_KERNEL */
     rc = fdexecute_command(fdp,FDABIOS_INIT);
   #endif  /* MACH_KERNEL */
   
   
     if (rc != FDSUCCESS) {
       FDDEBUG(FDOPEN,printf("FDOPEN: FDABIOS_INIT failed\n"));
   #ifdef  MACH_KERNEL
   #else   /* MACH_KERNEL */
       fdcleanup(NULL);
   #endif  /* MACH_KERNEL */
       return(EIO);
     }
   
     if (fdadapter.fd_numd == 0)           /* ABIOS sanity check */
     {
   #ifdef  MACH_KERNEL
       return D_NO_SUCH_DEVICE;
   #else   /* MACH_KERNEL */
       return(ENODEV);
   #endif  /* MACH_KERNEL */
     }
   
     if (fdadapter.fd_numd > FDMAXDRIVES) {
       log(LOG_WARNING,"fd: %d drives present.  Only %d are supported\n",
           fdadapter.fd_numd, FDMAXDRIVES);
       fdadapter.fd_numd = FDMAXDRIVES;
     }
   
   #ifdef OSF
     /* init interrupts */
     fd_handler.ih_level = fdadapter.fd_intl;
     fd_handler.ih_handler =  fdintr;
     fd_handler.ih_resolver = (int (*)()) NULL;
     fd_handler.ih_stats.intr_type = INTR_DEVICE;
     fd_handler.ih_stats.intr_cnt = 0;
     fd_handler.ih_priority = SPLFD;
     fd_handler.ih_flags = IH_FLAG_NOSHARE;
     if ((fd_handler_id = handler_add( &fd_handler )) != NULL)
       handler_enable( fd_handler_id );
     else
       return(ENXIO);
   #else
     ctlr->ctlr_pic = fdadapter.fd_intl;
     ctlr->ctlr_spl = SPLFD;
     take_ctlr_irq(ctlr);
   #endif /* OSF */
     return(FDSUCCESS);
   }
   
   /*
    * reset the adapter, since this causes an interrupt and hence
    * a sleep we are called from open not from probe/slave/attach
    */
   fdreset()
   {
     struct floppy *fdp = &floppies[0];
     int rc;
   
     /*  Reset the ABIOS "diskette system".  This does
      * stuff for the adapter, not a particular diskette
      * drive.
      */
     fdadapter.fdintr_status = FDBUSY;
     rc = fdexecute_command(fdp,FDABIOS_RESET);
     if (rc != FDSUCCESS) {
       FDDEBUG(FDOPEN, printf( "FDOPEN: FDABIOS_RESET failed\n"));
       fdcleanup(fdp);
       return(EIO);
     }
     
     return(FDSUCCESS);
   }
   
   /* NOTES: The 'devno' parameter always indicates which drive to open, and may
    * indicate the diskette characteristics to use.  The 'minor' macro is used
    * to extract the minor number from 'devno'.  If the minor number portion of
    * 'devno' is a 0 or a 1, then the fdopen() routine will attempt to
    * determine the drive type and diskette type by reading from the drive with
    * different drive characteristics.  This is done by calling the fdtype()
    * routine.  If the minor number is 4 or greater, then the diskette
    * characteristics implied by that format specific special file are used. 
    * The determination of the drive type can be suppressed by ORing the O_NDELAY
    * flag into the 'devflag' parameter.  This is mainly used by the format
    * command since the open will otherwise fail for an unformatted diskette. 
    */
   int
   fdopen(dev, flags)
        dev_t dev;
        int flags;
   {
     register struct floppy *fdp;
     int drive;
     int rc;
     int firstopen = 1;            /* For MULTIPLE_OPENS */
     static int fdinited = 0;
   
     FDDEBUG(FDOPEN,printf("fdopen(%x,%x)\n",dev,flags));
   
     /*  This needs to be done early so we can use the values it
      * initializes.
      */
     if (!fdinited) {
       fdinited = 1;
       if ( (rc = fdreset()) != FDSUCCESS )
         return(rc);
     }
   
     drive = fd_drive(dev);                /* get the drive # */
     if (drive < 0 || drive >= fdadapter.fd_numd) {
       FDDEBUG(FDOPEN, printf("FDOPEN: bad drive number %d\n",drive));
       return (EINVAL);
     }
   
     fdp = &floppies[drive];
   
   /* This was commented out for MACH 3.0 because flags is not passed down */
   
   #ifdef  MACH_KERNEL
   #else   /* MACH_KERNEL */
   
     if (fdp->drive_state != FDSTAT_CLOS) {
       /*  Check to see if 2nd open has the same characteristics as the
        * previous opens, as well as exclusive opens.
        */
       FDDEBUG(FDOPEN, printf("fdopen: drive already open\n"));
   
       if ( (minor(fdp->device_number) != minor(dev)) ||
            (flags & O_EXCL) || (fdp->drive_state & FDSTAT_EXOP) ) {
         return(EBUSY);
       }
       
       goto fd_multopen;   /* skip some 1st time stuff */
     }
   #endif  /* MACH_KERNEL */
   
   
     /* Load the structure 'floppy' with the default values and the minor
      * device number. 
      */
     fdp->device_number = dev;
     rc = fdload_floppy(fdp, FDREAD_PARMS);        /* drive info */
     if (rc != FDSUCCESS) {
       fdcleanup(fdp);
       FDDEBUG(FDOPEN,printf("FDOPEN: default load failed\n"));
       return (rc);
     }
   
     /* This has to happen before fddoor_check() so that we get past
      * the media changed signal successfully.
      */
     fdp->fd_change = FDCHANGE_NEW;
   
   fd_multopen:
   
   #ifdef  MACH_KERNEL
   if (!(flags & D_NODELAY)) {
   
   /*
      Commented out to allow working of floppy for Mach 3.0 
   
      rc = fddoor_check(fdp, (flags&D_WRITE));
   */
      if (rc != FDSUCCESS) {
           fdcleanup(fdp);
           return(rc);
      }
   }
   #else   /* MACH_KERNEL */
   
     if (flags & O_EXCL)
       fdp->drive_state |= FDSTAT_EXOP;
   
     /* Don't read the diskette if open with O_NDELAY
     */
     if (!(flags & O_NDELAY)) {
       /* Check for diskette presence and write protection (if opening for
        * write).
        */
       rc = fddoor_check(fdp, (flags&FWRITE));
       if (rc != FDSUCCESS) {
         fdcleanup(fdp);
         return (rc);
       }
     }
   
   #endif  /* MACH_KERNEL */
   
     else {
       /* If the O_NDELAY flag is set, the open is done.  Set
        * drive state to FDOPEN and return. 
        */
       fdp->drive_state = FDSTAT_OPEN;
       FDDEBUG(FDOPEN,printf("fdopen: opened O_NDELAY\n"));
       return(0);
     }
   
     /*  Some more stuff that needs to only be done on the first open.
     */
     if (firstopen) {
   #ifdef NEEDS_WORK               /* NEEDS WORK */
   /* NEEDS WORK --  Need to do media sence and r/w the diskette before we
   ** NEEDS WORK -- can determine it's soft type...someday.
   */
       /*  Call fdtype() to load the floppy structure with the
        * correct characteristics.
        */
       rc = fdtype(fdp);
       if (rc != FDSUCCESS) {
         FDDEBUG(FDOPEN, ("FDOPEN: fdtype failed\n"));
         fdcleanup(fdp);
         fdp->drive_state = FDSTAT_CLOS;
         return (rc);
       }
   #endif
   
       /*  We're finally ready to set the open flag.  Note that
        * we don't want to set the open flag until the very end
        * so that we can tell if the drive was on a multiple
        * open or not.
        */
       fdp->drive_state = FDSTAT_OPEN;
       fdp->close_waiting = FALSE;
     }
   
     FDDEBUG(FDOPEN,printf("fdopen: successful\n"));
     return(0);
   }
   
   /*  Close the diskette drive.  Turn off the light if there is no other
    * activity on the adapter.  Make sure timers and stuff are off.
    */
   int 
   fdclose(devno)
        dev_t devno;
   {
     register struct floppy *fdp;
     int pri;                              /* for spl* calls */
     int drive;
   
     FDDEBUG(FDCLOSE, printf("fdclose: entering...\n"));
   
     drive = fd_drive(devno);
   
     FDDEBUG(FDCLOSE,printf("fdclose: drive %d\n", drive));
   
     /* Is the drive given valid?
      */
     if (drive < 0 || drive >= fdadapter.fd_numd)
       return (EINVAL);
   
     fdp = &floppies[drive];
   
     /* Check if see if finished with all i/o for this drive.  If
      * not, sleep until i/o is finished. 
      */
     pri = splfd();
     while (fdp->headptr != NULL) {
       FDDEBUG(FDCLOSE, printf("fdclose: wait for i/o to finish\n"));
   
       fdp->close_waiting = TRUE;
       sleep(&fdp->close_sleep, PRIBIO);   /* NEEDS WORK */
     }
     splx(pri);
   
     /* Mark this drive as FDCLOSED, call fdcleanup() to do any
      * cleanup that is possible (including turning off the
      * light if need be).
      */
     fdp->drive_state = FDSTAT_CLOS;
     fdcleanup(fdp);
   
     FDDEBUG(FDCLOSE, printf("fdclose: done\n"));
     return(0);
   }
   
   /*  The block i/o entry point.  Check parameters for validity and enqueue
    * the request, starting i/o if the adapter is free.
    */
   int 
   fdstrategy(bp)
        register struct buf *bp;
   {
     register struct floppy *fdp;
     int pri;
   
     FDDEBUG(FDSTRAT, printf("fdstrategy: entering...\n"));
   
     fdp = &floppies[fd_drive(bp->b_dev)];
     bp->b_resid = 0;
     bp->b_error = 0;
     bp->av_forw = NULL;
   
     /* If the byte transfer length is not a multiple of 512
      * bytes, return EINVAL and return. 
      */
     if (bp->b_bcount % fdp->bytes_per_sector) {
       FDDEBUG(FDSTRAT, printf("fdstrategy: n != x*512\n"));
       bp->b_flags |= B_ERROR;
       bp->b_error = EINVAL;
   
       /* no data transferred */
       bp->b_resid += bp->b_bcount;
   
       iodone(bp);
       goto fd_done;
     }
   
     /*  Verify that i/o does not start past the end of the
      * diskette. Also, verify that the starting block number is
      * non-negative.
      *
      *  Error codes:
      *    EINVAL - the blkno is negative, or is a read past
      *    the last block on the media
      *    ENOSPC - A write past the end of the media.
      *
      *  Note that a read on the last block (actually 1st non-
      * valid block) is not an error, but not data is transferred.
      */
     if ( (bp->b_blkno < 0) || (bp->b_blkno >= fdp->number_of_blocks) ) {
       FDDEBUG(FDSTRAT, printf("fdstrategy: invalid blkno\n"));
   
       if (!(bp->b_flags & B_READ)) {      /* B_WRITE */
         bp->b_flags |= B_ERROR;
         if (bp->b_blkno < 0)
           bp->b_error = EINVAL;
         else
   #ifdef  MACH_KERNEL
           bp->b_error = EIO;              /* EIO is mapped D_IO_ERROR */
   #else   /* MACH_KERNEL */
           bp->b_error = ENOSPC;
   #endif  /* MACH_KERNEL */
       }
       else if (bp->b_blkno == fdp->number_of_blocks) {
         bp->b_error = 0;
       }
       else {
         bp->b_flags |= B_ERROR;
         bp->b_error = EINVAL;
       }
   
       /* all cases use the same b_resid */
       bp->b_resid = bp->b_bcount;
   
       iodone(bp);
       goto fd_done;
     }
   
     /*  See if there are any buffer headers in the queue.
      * If there are, put the buffer header at the end of
      * the queue.  If the queue is empty, put the buffer
      * header in the queue and call fdio(). 
      */
     pri = splfd();
   
     if (fdp->headptr != NULL) {   /* queue not empty */
       FDDEBUG(FDSTRAT, printf("fdstrategy: buf appended to q\n"));
   
       /* link it in the list:
        *  - old tail points at new element
        *  - new element becomes the new tail
        */
       fdp->tailptr->av_forw = bp;
       fdp->tailptr = bp;
   
       splx(pri);
     }
     else {                        /* q empty -> start i/o */
       /* set up the queue of 1 buf struct
        *  - head and tail are the same.
        */
       fdp->headptr = fdp->tailptr = bp;
   
       /*  If the adapter is free (other diskettes also
        * not busy) then start the io.  If the adapter
        * is busy, then the interrupt handler will find
        * the request and start it up.
        *
        *  To start the i/o, re-enable interrupts, make
        * sure we can get the adapter (it will not sleep
        * if we are at interrupt level), and then start
        * the i/o.
        */
       if (fdadapter.fdintr_status == FDFREE) {
         FDDEBUG(FDSTRAT, printf("fdstrategy: startio\n"));
   
         splx(pri);
         fdget_adapter();
         fdio(bp);
       }
       else
         splx(pri);
     }
   
   fd_done:
     FDDEBUG(FDSTRAT, printf("fdstrategy: done\n"));
     return (FDSUCCESS);
   }
   
   /*  Raw read.  Use physio() to do the transfer.
    *
    * NEEDS WORK - We should handle unaligned transfers for both read and
    * NEEDS WORK - in a common routine around here somewhere.
    */
   int 
   fdread(devno, uiop)
        dev_t devno;
        struct uio *uiop;
   {
     register struct buf *bp = &fdbp[fd_drive(devno)];
   
   #ifdef  MACH_KERNEL
   #else   /* MACH_KERNEL */
     register struct iovec *iov;
     register int cnt;
   #endif  /* MACH_KERNEL */
   
     FDDEBUG(FDREAD, printf("fdread: start\n"));
   
   
   #ifdef  MACH_KERNEL
   #else   /* MACH_KERNEL */
   
     /*  Check for atleast 512 byte alignment on all io_vec's.
      */
     iov = uiop->uio_iov;
     for(cnt = 0 ; cnt < uiop->uio_iovcnt; cnt++) {
       if ( ((u_int)(iov++)->iov_base) & 0x1ff)
         return(EIO);
     }
   
   #endif  /* MACH_KERNEL */
   
     return(physio(fdstrategy,bp,devno,B_READ,fdmincnt,uiop));
   }
   
   /* Raw write.  Use physio() to do the transfer.
    */
   int 
   fdwrite(devno, uiop)
        dev_t devno;
        struct uio *uiop;
   {
     register struct buf *bp = &fdbp[fd_drive(devno)];
   
   #ifdef  MACH_KERNEL
   #else   /* MACH_KERNEL */
     register struct iovec *iov;
     register int cnt;
   #endif  /* MACH_KERNEL */
   
     FDDEBUG(FDWRITE, printf("fdwrite: start\n"));
   
   
   #ifdef  MACH_KERNEL
   #else   /* MACH_KERNEL */
     /*  Check for atleast 512 byte alignment on all io_vec's.
      */
     iov = uiop->uio_iov;
     for(cnt = 0 ; cnt < uiop->uio_iovcnt; cnt++) {
       if ( ((u_int)(iov++)->iov_base) & 0x1ff)
         return(EIO);
     }
   #endif  /* MACH_KERNEL */
   
     return(physio(fdstrategy,bp,devno,B_WRITE,fdmincnt,uiop));
   }
   
   /* Changed for the 3.0 port */
   
   #ifdef  MACH_KERNEL
   #else   /* MACH_KERNEL */
   
   /* ioctl entry point.  Lots of status, plus things like format.
    *
    * NEEDS WORK -- no ioctl's are currently implemented.
    */
   int 
   fdioctl(devno, op, arg, devflag)
        dev_t devno;
        int op;
        register long arg;
        u_int devflag;
   {
   #ifdef NEEDS_WORK                       /* NEEDS WORK: LOOK AT IOCTLs LATER */
     register struct floppy *fdp;
     register struct devinfo *devinfop;
     register struct fdinfo *fdinfop;
     register struct fdparms *fdparmsp;
     int tmp;
     int rc = FDSUCCESS;
   
     FDDEBUG(FDIOCTL, printf("fdioctl: start\n"));
   
     fdp = &floppies[fd_drive(devno)];
   
     switch (op) {
   
     case IOCINFO:
       /* The following ioctl operation is defined for every device
        * that uses the ioctl interface. 
        *
        * IOCINFO - returns some information about the diskette.
        * This is a standard ioctl option that can be issued to find
        * out information about any device that uses ioctls.  A
        * poiner to a structure of type devinfo should be passed in
        * the 'arg' parameter.  The information about the diskette
        * will be loaded into the devinfo structure. 
        */
       FDDEBUG(FDIOCTL, printf("fdioctl: IOCINFO\n"));
   
       /* Allocate a devinfo structure. */
       devinfop = (struct devinfo *) malloc(sizeof(struct devinfo));
   
       if (devinfop == NULL)
         rc = ENOMEM;
       else {
         devinfop->devtype = DD_DISK;
         devinfop->flags = DF_RAND;
         devinfop->un.dk.bytpsec = (short) fdp->bytes_per_sector;
         devinfop->un.dk.secptrk = (short) fdp->sectors_per_track;
         devinfop->un.dk.trkpcyl = (short) fdp->tracks_per_cylinder;
         devinfop->un.dk.numblks = (long) fdp->number_of_blocks;
   
         /* Copy the structure to the user's address space.
          */
         tmp = copyout( (char *)devinfop, (char *)arg,
                       sizeof(struct devinfo) );
         if (tmp == -1)
           rc = EINVAL;
   
         free((caddr_t) devinfop);
       }
       break;
   
     case FDIOCFORMAT:
       /* See the header comment for fdiocformat()
        */
       FDDEBUG(FDIOCTL, printf("fdioctl: FDIOCFORMAT\n"));
   
       rc = fd_iocformat(devno,arg,fdp);
   
       FDDEBUG(FDIOCTL, printf("fdioctl: done\n"));
       break;
   
     case FDIOCGINFO:
       /* FDIOCGINFO - gets the current diskette characteristics.  A
        * pointer to a structure of type fdinfo must be passed in
        * the 'arg' parameter.  This operation will load the fdinfo
        * structure with the current diskette parameters. 
        */
       FDDEBUG(FDIOCTL, printf("fdioctl: FDIOCGINFO\n"));
   
       /* Allocate an fdinfo structure. */
       fdinfop = (struct fdinfo *) malloc(sizeof(struct fdinfo));
   
       if (fdinfop == NULL)
         rc = ENOMEM;
       else {
         fdinfop->type = (short) (fdp->drive_type);
         fdinfop->nsects = (int) (fdp->sectors_per_track);
         fdinfop->sides = (int) (fdp->tracks_per_cylinder);
         fdinfop->ncyls = (int) (fdp->cylinders_per_disk);
   
         /* Call copyout to copy the fdinfo structure to the
          * user. 
          */
         tmp = copyout((char *) (fdinfop), (char *) (arg),
                       sizeof(struct fdinfo));
         if (tmp == -1)
           rc = EINVAL;
   
         free((caddr_t) fdinfop);
       }
       break;
   
     case FDIOCSINFO:
       /* See the header comment for fd_iocsinfo()
        */
       FDDEBUG(FDIOCTL, printf("fdioctl: FDIOCSINFO\n"));
       rc = fd_iocsinfo(fdp,arg);
       break;
   
     case FDIOCRETRY:
     case FDIOCNORETRY:
       /* FDIOCRETRY - enables retries on errors.
        * FDIOCNORETRY - disables retries on errors.
        *
        * These operations require RAS_CONFIG authority.
        */
       FDDEBUG(FDIOCTL, printf("fdioctl: FDIOCNORETRY\n"));
   
       if (priv_chk(RAS_CONFIG))
         fdp->retry_flag = (op == FDIOCRETRY) ? TRUE : FALSE;
       else
         rc = EACCES;
       break;
   
     case FDIOCSTATUS:
       /* See header comment for fd_iocstatus()
        */
       rc = fd_iocstatus(fdp,arg);
       break;
   
     case FDIOCGETPARMS:
       /* FDIOCGETPARMS - gets various drive and diskette parameters
        * and returns them to the caller. 
        *
        * The following two ioctls are designed for use by the PC
        * simulator. 
        */
       FDDEBUG(FDIOCTL, printf("fdioctl: FDIOCGETPARMS\n"));
   
       /* Allocate an fdparms structure.
        */
       fdparmsp = (struct fdparms *) malloc(sizeof(struct fdparms));
       if (fdparmsp == NULL) {
         rc = ENOMEM;
         break;
       }
   
       fdparmsp->diskette_type = fdp->diskette_type;
       fdparmsp->sector_size = fdp->e_bytesps;
      fdparmsp->sectors_per_track = fdp->sectors_per_track;
      fdparmsp->sectors_per_cylinder = fdp->sectors_per_cylinder;
      fdparmsp->tracks_per_cylinder = fdp->tracks_per_cylinder;
      fdparmsp->cylinders_per_disk = fdp->cylinders_per_disk;
      fdparmsp->data_rate = fdp->data_rate;
      fdparmsp->head_settle_time = fdp->head_settle_time;
      fdparmsp->head_load = 0;
      fdparmsp->fill_byte = fdp->fill_byte;
      fdparmsp->step_rate = 0;
      fdparmsp->step_rate_time = 0;
      fdparmsp->gap = fdp->gap;
      fdparmsp->format_gap = fdp->format_gap;
      fdparmsp->data_length = fdp->data_length;
      fdparmsp->motor_off_time = fdp->motor_off_time;
      fdparmsp->bytes_per_sector = fdp->bytes_per_sector;
      fdparmsp->number_of_blocks = fdp->number_of_blocks;
  
      /* Call copyout to copy the fdinfo structure to the user. */
  
      tmp = copyout((char *) (fdparmsp), (char *) (arg), sizeof(struct fdparms));
      if (tmp == -1)
        rc = EINVAL;
      free((caddr_t) fdparmsp);
      break;
  
    case FDIOCSETPARMS:
  #define check(cnd,errno)        if (!(cnd)) {                   
                                          free((caddr_t) fdparmsp);
                                          rc = (errno);           
                                          break;  
                                  }
  #define cond(member)            (fdp->member == fdparmsp->member)
  
      /* FDIOCGETPARMS - sets various drive and diskette parameters
       * from values passed in from the caller. 
       */
      FDDEBUG(FDIOCTL, printf("fdioctl: FDIOCSETPARMS\n"));
  
      /* Allocate an fdparms structure. */
  
      fdparmsp = (struct fdparms *) malloc(sizeof(struct fdparms));
      if (fdparmsp == NULL) {
        rc = ENOMEM;
        break;
      }
  
      /* get the fdparms structure from the user
       */
      tmp = copyin((char *) (arg), (char *) (fdparmsp),
                   sizeof(struct fdparms));
      check(tmp == 0,EINVAL);
  
      /*  There are certin fields we just can't let the user
       * change, because it will reek havoc on the driver, and
       * potentially the kernel.  Here we check them, and return
       * EINVAL if they are bad.  Note they are also not set, but
       * we want to return EINVAL, just to make sure someone
       * doesn't get the delusion that something has changed.
       */
      check(fdp->diskette_type == fdparmsp->diskette_type,EINVAL);
      check(fdparmsp->head_load == 0,EINVAL);
      check(fdparmsp->step_rate == 0,EINVAL);
      check(fdparmsp->step_rate_time == 0,EINVAL);
      check(cond(sectors_per_track),EINVAL);
      check(cond(sectors_per_cylinder),EINVAL);
      check(cond(tracks_per_cylinder),EINVAL);
      check(cond(cylinders_per_disk),EINVAL);
      check(cond(data_rate),EINVAL);
      check(cond(head_settle_time),EINVAL);
      check(cond(number_of_blocks),EINVAL);
      check(cond(bytes_per_sector),EINVAL);
  
      /*  Now the fields we can really change with a "Set Device
       * Parameters" ABIOS call.  If the attribute has changed
       * then we save the original value, and call FD_SETDP_POLL
       * or FD_SETMT_POLL to attempt to change the value.  If the
       * call fails, we back out the change, and fail the ioctl
       * with EINVAL.
       */
      if (fdp->e_bytesps != fdparmsp->sector_size) {
        check((fdparmsp->sector_size==FD_256_BYTE_PER_SECTOR)||
              (fdparmsp->sector_size==FD_512_BYTE_PER_SECTOR),
              EINVAL);
        tmp = fdp->e_bytesps;
        fdp->e_bytesps = fdparmsp->sector_size;
        fdget_adapter();
        if (fdexecute_command(fdp,FD_SETDP_POLL)!=FDSUCCESS) {
          fdp->e_bytesps = tmp;
          free(fdparmsp);
          rc = EINVAL;
          break;
        }
  
        /*  When changing the sector_size, bytes_per_sector
         * is implicitly changed, and we need to reflect
         * this back to the user so he can continue to make
         * fdiocsetparms ioctl's with the current fdparm
         * structure.
         */
        fdparmsp->bytes_per_sector = fdp->bytes_per_sector;
        tmp = copyout((char *) (fdparmsp), (char *) (arg),
                      sizeof(struct fdparms));
        check(tmp == 0,EINVAL);
      }
  
      if (fdp->gap != fdparmsp->gap) {
        tmp = fdp->gap;
        fdp->gap = fdparmsp->gap;
        fdget_adapter();
        if (fdexecute_command(fdp,FD_SETDP_POLL)!=FDSUCCESS) {
          fdp->gap = tmp;
          free(fdparmsp);
          rc = EINVAL;
          break;
        }
      }
  
      if (fdp->data_length != fdparmsp->data_length) {
        tmp = fdp->data_length;
        fdp->data_length = fdparmsp->data_length;
        fdget_adapter();
        if (fdexecute_command(fdp,FD_SETDP_POLL)!=FDSUCCESS) {
          fdp->data_length = tmp;
          free(fdparmsp);
          rc = EINVAL;
          break;
        }
      }
  
      if (fdp->fill_byte != fdparmsp->fill_byte) {
        tmp = fdp->fill_byte;
        fdp->fill_byte = fdparmsp->fill_byte;
        fdget_adapter();
        if (fdexecute_command(fdp,FD_SETMT_POLL)!=FDSUCCESS) {
          fdp->fill_byte = tmp;
          free(fdparmsp);
          rc = EINVAL;
          break;
        }
      }
  
      if (fdp->format_gap != fdparmsp->format_gap) {
        tmp = fdp->format_gap;
        fdp->format_gap = fdparmsp->format_gap;
        fdget_adapter();
        if (fdexecute_command(fdp,FD_SETMT_POLL)!=FDSUCCESS) {
          fdp->format_gap = tmp;
          free(fdparmsp);
          rc = EINVAL;
          break;
        }
      }
  
      /*  Update the motor off time:  If it is really changed, then
       * calculate the delta between the 2 times, making sure the
       * value is atleast 1 second so it won't possibly get missed.
       */
      /* NEEDS WORK -- this code changed a touch from version 3
       * NEEDS WORK -- since we use 1/HZ timers instead of watch-
       * NEEDS WORK -- dogish timers, and we have to untimeout()
       * NEEDS WORK -- them, and can't update on the fly...Don't
       * NEEDS WORK -- if we can get it to change the time, until
       * NEEDS WORK -- with the next time out...
       */
      if (fdp->motor_off_time != fdparmsp->motor_off_time) {
  #ifdef NEEDS_WORK       /* NEEDS WORK */
        tmp =     fdadapter.mot_wd.time - 
          (fdp->motor_off_time -
           fdparmsp->motor_off_time);
        tmp = (tmp < 1) ? 1 : tmp;
        fdadapter.mot_wd.timer.count = tmp;
  #endif
        fdadapter.mot_wd.time = fdparmsp->motor_off_time;
        fdp->motor_off_time = fdparmsp->motor_off_time;
      }
  
      free((caddr_t) fdparmsp);
      break;
  
    default:
      FDDEBUG(FDIOCTL, printf("fdioctl: no such ioctl\n"));
      rc = EINVAL;
      break;
    }
  
    FDDEBUG(FDIOCTL, printf("fdioctl: done\n"));
    return (rc);
  #else
    return(EINVAL);
  #endif
  }
  #endif  /* MACH_KERNEL */
  
  
  /*  This routine calls fdcall_abios() and uses sleep() to wait until
   * the call is completed.  The FD_RB_SYNC flag is set in the request
   * block so the interrupt handler knows to handle the request specially.
   *
   * The interrupt handler uses wakeup() to wake this process up, and does
   * not do an iodone() since a polled request will never come from the 
   * buffer cache.
   *
   * The 3rd parameter to this function (sched) is a boolean that indicates
   * if we should call fd_sched() to look for more ABIOS requests to process.
   * This is useful when a particular function requires multiple ABIOS
   * requests or the caller needs to use values out of the request block,
   * and does not want to have these values trashed by subsequent ABIOS calls.
   *
   * NOTES: fdcall_abios_poll() should not be used for ABIOS calls that do
   * not stage on time, or stage on interrupt.  Use fdcall_abios() for this
   * directly.  If the poll functionality is used in this case, then the
   * error code cannot be returned properly.
   *
   *  open_check gets set to FALSE when the polled request is done.  See
   * fdtimer() for more info.
   */
  static int
  fdcall_abios_poll(abios_function, rb, sched)
       int abios_function;
       register struct Fd_request *rb;
       int sched;
  {
    register struct floppy *fdp;
    int rc;
    int pri;                      /* for i_ calls */
  
    FDDEBUG(FDABIOS, printf("fdcall_abios_poll: function 0x%x (%s) rb=0x%x sched=%d\n",
          abios_function, ABIOS_FUNCTION_NAME(abios_function),rb,sched));
  
    fdp = &floppies[rb->r_unit];  /* get floppy structure */
    fdp->timeout_flag = FALSE;    /* clear timeout flag */
    rb->state |= FD_RB_SYNC;      /* this is a synchronous request */
    rb->req_errno = 0;            /* clear for non-intr calls */
  
  
    fdcall_abios(abios_function,rb);
  
  
  
    /*  Sleep until our request is finished.
     */
    
    pri = splfd();
  
    while (rb->r_return_code != ABIOS_DONE) {
      FDDEBUG(FDABIOS,printf("fdcall_abios_poll: calling sleep\n"));
      sleep(&rb->sleep_on_intr, PRIBIO);  /* NEEDS WORK */        
      FDDEBUG(FDABIOS, printf("fdcall_abios_poll: sleep done\n"));
    }
  
  
    splx(pri);
  
  
    /*  Any errors will be found on interrupt level and passed 
     * back to use through req_errno.
     */
  
    rc = rb->req_errno;
  
    pri = splfd();
    rb->state &= ~FD_RB_SYNC;     /* done with sync reqest */
    fdp->open_check = FALSE;      /* make sure this gets set off */
  
    /*  If the caller wants is to schedule more jobs, and the request
     * passed then try schedule a job.  If the request failed then
     * fdexecute_command() will end up calling fd_sched() for us.
     */
  
    if ( (sched == TRUE) && (rc == FDSUCCESS) )
      fd_sched(fdp);              /* look for additional requests */
  
    splx(pri);
  
    FDDEBUG(FDABIOS, printf("fdcall_abios_poll: done\n"));
  
    return (rc);
  }
  
  /*  Calls ABIOS (abios_common_start() is used).  Sets up a watchdog
   * timer to watch for losing interrupts.  Also sets up for the first
   * first stage on time by scheduling a stage on time "interrupt".
   */
  static int
  fdcall_abios(abios_function, rb)
       int abios_function;
       register struct Fd_request *rb;
  {
    FDDEBUG(FDABIOS, printf("fdcall_abios: function 0x%x (%s)\n", abios_function,       ABIOS_FUNCTION_NAME(abios_function)));
  
    rb->r_function = abios_function;
    rb->r_return_code = ABIOS_UNDEFINED;
    rb->state |= FD_RB_STARTED;
  
    abios_common_start(rb, fdadapter.fd_flag);
  
    FDDEBUG(FDABIOS, {
        printf("[start_rw] RET abios_common_start... status=%x [", rb->r_return_code);
          fd_error_decode(rb->r_return_code, "]\n");});
  
    /*  Schedule a pseudeo interrupt if ABIOS tells us to wait.
     */
  
  
    if (rb->r_return_code == ABIOS_STAGE_ON_TIME) {
      FDDEBUG(FDABIOS,printf("fdcall_abios: ABIOS_STAGE_ON_TIME(%d)\n",
                             fd_wait_time(rb)));
  
      timeout(fd_stot,(caddr_t)NULL,us2tics(fd_wait_time(rb)));
    }
  
    /*  If this operation does not return immediatly, it will set
     * r_time_out.  Set a watchdog for the proper # of seconds
     * incase this operation does not complete.
     */
  
    if (rb->r_time_out != 0) {
      fdadapter.int_wd.time = (rb->r_time_out >> 3) * HZ;
      fdadapter.int_wd.fdp = &floppies[fdadapter.fd_req.r_unit];
      TIMEOUT(fdadapter.int_wd);
    }
  
    FDDEBUG(FDABIOS, printf("fdcall_abios: done\n"));
    return(FDSUCCESS);
  }
  
  /*  Does some front/back end processing for fdissue_command().
   *
   *  Calls fdissue_command() and arranges for proper scheduling of further
   * jobs after that request is done.
   */
  static int 
  fdexecute_command(fdp, arg)
       register struct floppy *fdp;
       int arg;
  {
    int sched_needed;             /* schedule flag */
    int pri;                      /* for i_* */
    int rc;
  
    /*  This is a safty catch.  It is assumed that the job calling
     * fdexecute_command() has gotten access to the controller.
     */
    assert(fdadapter.fdintr_status == FDBUSY);
  
    rc = fdissue_command(fdp, arg);
  
    if (rc == FDSUCCESS) {
      switch (arg) {
      case FDABIOS_INIT:
      case FDREAD_PARMS:
      case FDRMEDIA_PARMS:
      case FDLOAD_144:
      case FDLOAD_720:
      case FDLOAD_360:
      case FD_SETDP_POLL:
        /*  For commands that poll and need to read data
         * out of the request block, we must schedule
         * the pending requests.
         */
        sched_needed = TRUE;
        break;
  
      default:
        sched_needed = FALSE;
        break;
      }
    }
    else {
      /*  A schedule is not on polled requests that fail.  All
       * non-polled requests return FDSUCCESS always.
       */
      sched_needed = TRUE;
    }
  
    /*  If we have a status of free, check to see if there are any
     * requests to do, and if so, do start them up.
     */
    pri = splfd();
    if (sched_needed == TRUE)
      fd_sched(fdp);
    splx(pri);
  
    return (rc);
  }
  
  /*  Sets up the floppy structure for i/o and calls fdstartio. This routine
   * translates the starting block of a read or write into the cylinder,
   * head, sector address required by the controller.  It then computes
   * the total number of reads or writes needed and initializes the fields
   * in the floppy structure that are used to execute a read or write. 
   *
   * NOTES: This routine is called once for each buf struct processed.  It is
   * called by both fdstrategy() and fdintr() to initiate a new i/o sequence
   * for a given buf struct. 
   */
  static void 
  fdio(bp)
       register struct buf *bp;
  {
    register struct floppy *fdp;
    u_char drive;
    daddr_t last_block;
  
    drive = fd_drive(bp->b_dev);
    fdp = &floppies[drive];
    FDDEBUG(FDCMD, printf("fdio: start io drive %d\n", drive));
  
    /* See if a request goes past the end of the diskette.
     */
    last_block = bp->b_blkno + (bp->b_bcount / fdp->bytes_per_sector);
  
    fdp->modified_bcount = bp->b_bcount;  /* cnt for this transfer */
  
    if (last_block > fdp->number_of_blocks) {
      /* Request starts before the end of the diskette but
       * runs over the end. Set up to do a partial data transfer
       * and return the number of bytes not transferred in the
       * b_resid field. 
       */
      FDDEBUG(FDCMD, printf("fdio: truncated request\n"));
  
      bp->b_resid =       (last_block - fdp->number_of_blocks) *
        fdp->bytes_per_sector;
      fdp->modified_bcount -= bp->b_resid;
    }
  
    /* initialize io counters */
    fdp->buf_offset = 0;
    fdp->sectors_done = 0;
    fd_clear_retry(fdp);
  
    /*  Set up the transfer with fdsetup_transfer, and if this
     * succeeds, then actually start the transfer.
     */
    if (fdsetup_transfer(fdp))
      fdstartio(fdp);
  
    return;
  }
  
  /*  Takes an fdp, and sets the transfer in terms of what AIBOS understands.
   * Mainly this is converting an offset into a physical address on the
   * diskette.
   *
   *  We also have to check for splitting transfers that would encompass
   * multiple heads.  Another thing we do is set up the request block which
   * includes using pmap_extract() to get the physical address.
   */
  static int
  fdsetup_transfer(fdp)
       register struct floppy *fdp;
  {
    daddr_t blkno;
    u_char cyl;
    u_char head;
    u_char sect;
    u_short sectors_left;
    u_short temp;
    int msize;                    /* maximum size of transfer */
    u_int paddr;
    u_int vaddr;
  
    /*  Calculate blkno of transfer as where we were suppost to 
     * start plus where we currently are.
     */
    blkno = (daddr_t) fdp->headptr->b_blkno + fdp->sectors_done;
  
    /* Translate block number into physical address. 
     */
    FDDEBUG(FDCMD, printf("fdio: start block is #%d\n", blkno));
    cyl = fdp->start.cylinder = blkno / fdp->sectors_per_cylinder;
    temp = blkno % fdp->sectors_per_cylinder;
    head = fdp->start.head = temp / fdp->sectors_per_track;
    sect = fdp->start.sector = (temp % fdp->sectors_per_track) + 1;
  
    /* Set up the other fields in 'floppy' that are used for keeping
     * track of reads and writes. 
     */
    fdp->start_block = blkno;
    fdp->sector_count = fdp->modified_bcount / fdp->bytes_per_sector;
  
    /* compute number of sectors to r/w from starting cylinder
     */
    sectors_left = fdp->sectors_per_cylinder - head *
      fdp->sectors_per_track - sect + 1;
  
    /*  If a read requires of multiple sectors goes onto another cylinder
     * then we have to split it into multiple requests.
     */
    if (sectors_left < fdp->sector_count) {
      FDDEBUG(FDCMD, printf("fdsetup_transfer: multiple requests!!\n"));
  
      fdp->transfer_split = TRUE;
      fdp->start.transfer_length = sectors_left * fdp->bytes_per_sector;
    }
    else {
      fdp->start.transfer_length = fdp->modified_bcount;
      fdp->transfer_split = FALSE;
    }
  
    /* Check to see if transfer crosses a page boundry.  If so we
     * need to split it into multiple transfers.  Also set up both
     * the virtual and physical pointers for the ABIOS call.
     */
    vaddr = (u_int) fdp->headptr->b_un.b_addr + fdp->buf_offset;
    msize = d_max_page(fdp->headptr, vaddr, &paddr, fdp->start.transfer_length);
    fd_data_ptr_1(&fdadapter.fd_req) = vaddr;
    fd_data_ptr_2(&fdadapter.fd_req) = paddr;
  
    if (msize < fdp->start.transfer_length) {
      FDDEBUG(FDCMD,printf("fdsetup_transfer: split for page!\n"));
  
      if (!msize) {
        fdiodone(fdp->headptr,&fdadapter.fd_req,fdp,EIO);
        return(0);
      }
  
      fdp->transfer_split = TRUE;
      fdp->start.transfer_length = msize;
    }
  
    return(1);
  }
  
  /*  Builds a command for ABIOS, and then calls the ABIOS interface routines.
   *
   *  This should only be called when you have the FDBUSY flag set for you
   * job.  Currently only fdexecute_command() and fdcommon_intr() call this.
   */
  static int 
  fdissue_command(fdp, arg)
       register struct floppy *fdp;
       int arg;
  {
    int rc = FDSUCCESS;
    register struct Fd_request *fdreq;
    u_char drive_number;
    int poll = arg & FDABIOS_POLL;        /* save poll status */
  
    arg &= ~FDABIOS_POLL;         /* make it transparent to switch */
  
    /* Set up:
     *    - reset timeout flag.
     *    - stop previous motor watchdog timer.
     *    - get local copies of the adapter pointer and the driveno
     */
    fdp->timeout_flag = FALSE;
    UNTIMEOUT(fdadapter.mot_wd);
    fdreq = &fdadapter.fd_req;
    drive_number = fd_drive(fdp->device_number);
  
    switch (arg) {
    case FDABIOS_INIT:
      /*  Does the first few ABIOS calls to initialize the 
       * request block, and find a little bit of info about
       * the adapter.  This is the first thing that should
       * be called for ABIOS, and before i_init() is done.
       *
       *  ie fdintr() must not be called till after this
       * done.  Nothing here will cause an interrupt.
       */
      FDDEBUG(FDCMD, printf("FDABIOS_INIT: entering...\n"));
  
      fdadapter.fd_flag = 0;
      fdreq->state = FD_RB_IDLE;
      fdreq->sleep_on_intr = 0;   /* NEEDS WORK -- sleep on? */
  
      /* First we have to set up the initial request block,
       * and call "Return Logical ID parameters" in order
       * to get info for future ABIOS calls.
       */
  
      FD_SET_RESERVED_ABIOS_LOGICAL_PARAMETER(fdreq);
  
      fdreq->r_current_req_blck_len = sizeof(struct Fd_request);
      fdreq->r_logical_id = abios_next_LID(FD_ID,2);
      fdreq->r_unit = 0;
      fdreq->request_header.Request_Block_Flags = 0; /* ABIOS32 */
      fdreq->request_header.ELA_Offset = 0;
      fd_no_retry(fdp);
  
      rc = fdcall_abios_poll(ABIOS_LOGICAL_PARAMETER, fdreq, FALSE);
  
      if (rc != FDSUCCESS)
        break;
  
      /*  Note:  We don't have to do an fdget_adapter() here
       * because the above call will not reschedule the floppy
       * adapter, and the FDBUSY flag will not get turned off.
       */
  
      /* update certain fields based on what abios just told us
       *  1) use the real block length
       *  2) logical .vs. physical ptr 
       *  3) hardware interrupt level
       *  4) # of drives on the adapter
       */
      fdreq->r_current_req_blck_len = fdreq->r_request_block_length;
      fdadapter.fd_flag = fdreq->r_logical_id_flags;
      fdadapter.fd_intl = fdreq->r_hardware_intr;
      fdadapter.fd_numd = fdreq->r_number_units;
  
      /* We need to make this call before ABIOS_RESET inorder
       * to get the motor_off_delay
       */
      
      FD_SET_RESERVED_ABIOS_READ_PARAMETER(fdreq);
      fdreq->r_unit = 0;
      fd_no_retry(fdp);
  
      rc = fdcall_abios_poll(ABIOS_READ_PARAMETER, fdreq, FALSE);
  
      fdadapter.motor_off_delay = fd_motor_off_delay_time(fdreq);
      /* rc falls through */
      break;
  
    case FDABIOS_RESET:
      /*  This does an ABIOS_RESET on the diskette system which
       * basically gets the adapter set up.  This should
       * be the 2nd thing called when initializing the adapter.
       * First FDABIOS_INIT should be called.
       */
      FDDEBUG(FDCMD, printf("FDABIOS_RESET: entering...\n"));
  
      FD_SET_RESERVED_ABIOS_RESET(fdreq);
      fdreq->r_unit = fd_drive(fdp->device_number);
      fd_no_retry(fdp);
  
      rc = fdcall_abios_poll(ABIOS_RESET, fdreq, TRUE);
      /* rc falls through */
      break;
  
    case FDREAD_PARMS:
      /*  This does a "Read Device Parameters" ABIOS call
       * inorder to populate the floppy structure with what
       * ABIOS thinks the values should be.
       */
      FDDEBUG(FDCMD, printf("FDREAD_PARMS: entering...\n"));
  
      FD_SET_RESERVED_ABIOS_READ_PARAMETER(fdreq);
      fdreq->r_unit = fd_drive(fdp->device_number);
      fd_no_retry(fdp);
  
      rc = fdcall_abios_poll(ABIOS_READ_PARAMETER, fdreq, FALSE);
      if (rc != FDSUCCESS)
        break;
  
      switch(fd_drive_type(fdreq)) {
      case FD_NO_DRIVE:
        rc = EIO;
        break;
      case FD_360_KB_DRIVE:
        fdp->drive_type = D_48;
        break;
      case FD_1440_KB_DRIVE:
        fdp->drive_type = D_135H;
        break;
      default:
        fdlog_error(fdp,FD_UNSUP_DRIVE);
        rc = EIO;
        break;
      }
  
      switch (fdp->e_bytesps = fd_bytes_per_sector(fdreq)) {
      case FD_256_BYTE_PER_SECTOR:
        fdp->bytes_per_sector = 256;
        break;
      case FD_512_BYTE_PER_SECTOR:
        fdp->bytes_per_sector = 512;
        break;
      default:
        fdlog_error(fdp,FD_UNSUP_SECT);
        rc = EIO;
      }
  
      /* Move info from request block to the fdp
       */
      fdp->sectors_per_track = fd_sectors_per_track(fdreq);
      fdp->abios_flags = fd_dev_ctrl_flag(fdreq);
      fdp->motor_start = fd_motor_start_delay_time(fdreq);
      fdp->cylinders_per_disk = fd_num_of_cylinders(fdreq);
      fdp->tracks_per_cylinder = fd_num_of_heads(fdreq);
      fdp->fill_byte = fd_format_fill_byte(fdreq);
      fdp->head_settle_time = fd_head_settle_time(fdreq);
      fdp->gap = fd_rwv_gap_len(fdreq);
      fdp->format_gap = fd_format_gap_len(fdreq);
      fdp->data_length = fd_data_len(fdreq);
  
  
      /* Calculate the rest of the fdp values:
       */
      fdp->number_of_blocks = fdp->sectors_per_track *
        fdp->cylinders_per_disk * fdp->tracks_per_cylinder;
      fdp->sectors_per_cylinder = fdp->sectors_per_track *
        fdp->tracks_per_cylinder;
      break;
  
    case FDRMEDIA_PARMS:
      /*  This will report the media parameters used for the
       * the last r/w/format. 
       */
      FDDEBUG(FDCMD, printf("FDRMEDIA_PARMS: entering...\n"));
  
      FD_SET_RESERVED_ABIOS_FD_READ_MEDIA_TYPE(fdreq);
      fdreq->r_unit = fd_drive(fdp->device_number);
      fd_no_retry(fdp);
  
      rc = fdcall_abios_poll(ABIOS_FD_READ_MEDIA_TYPE, fdreq, FALSE);
      if (rc != FDSUCCESS)
        break;
  
      /* Convert ABIOS return to a real value
       */
      switch (fdp->e_bytesps = fd_bytes_per_sector(fdreq)) {
      case FD_256_BYTE_PER_SECTOR:
        fdp->bytes_per_sector = 256;
        break;
      case FD_512_BYTE_PER_SECTOR:
        fdp->bytes_per_sector = 512;
        break;
      default:
        fdlog_error(fdp,FD_UNSUP_SECT);
        rc = EIO;
      }
  
      /* On the PS/2 the 5 1/4" adapter is 250 KBPS.  all the
       * other adapters are 500 KBPS.
       */
      fdp->data_rate = (minor(fdp->device_number) & FD_5)
        ? FD250KBPS : FD500KBPS;
  
      /* Move data from request block into fdp
       */
      fdp->sectors_per_track = fd_sectors_per_track(fdreq);
      fdp->cylinders_per_disk = fd_num_of_cylinders(fdreq);
      fdp->tracks_per_cylinder = fd_num_of_heads(fdreq);
      fdp->gap = fd_rwv_gap_len(fdreq);
      fdp->format_gap = fd_format_gap_len(fdreq);
      fdp->data_length = fd_data_len(fdreq);
  
      fdp->number_of_blocks = fdp->sectors_per_track *
        fdp->cylinders_per_disk * fdp->tracks_per_cylinder;
      fdp->sectors_per_cylinder = fdp->sectors_per_track *
        fdp->tracks_per_cylinder;
  
      /*  Now see if the values returned by the read media type
       * agree with the minor we're opened under.  If they do,
       * then everything is fine, otherwise return an appropriate
       * errno.
       */
      switch (minor(fdp->device_number) & ~FDDRIVEMASK) {
      case FD_GENERIC | FD_3:
      case FD_GENERIC | FD_5:
        /*  We don't have to check because by giving the
         * generic minor, we agree to use what the drive
         * tells us.
         */
        break;
      case FD_3H:
        if (fdp->number_of_blocks != 2880)
          rc = EIO;
        break;
      case FD_3L:
        if (fdp->number_of_blocks != 1440)
          rc = EIO;
        break;
      case FD_5L:
        if (fdp->number_of_blocks != 720)
          rc = EIO;
        break;
      case FD_5H:
      default:
        fdlog_error(fdp,FD_UNSUP_MINOR);
        rc = EINVAL;
        break;
      }
  
      /*  Lastly we want to set the diskette_type field.  We
       * already know the disk_type.  This will tell us how
       * the media in the diskette is formatted.
       */
      switch (fdp->number_of_blocks) {
      case 720:           /* 360K 5 1/4" */
        fdp->diskette_type = FD360_5;
        break;
      case 1440:          /* 720K 3 1/2" */
        fdp->diskette_type = FD720_3;
        break;
      case 2880:          /* 144M 3 1/2" */
        fdp->diskette_type = FD1440_3;
        break;
      default:
        fdlog_error(fdp,FD_UNSUP_DRIVE);
        rc = EINVAL;
      }
  
      break;
  
    case FDLOAD_144:
    case FDLOAD_720:
    case FDLOAD_360:
      /* These are dummy commands that do not use ABIOS, but
       * make the setting of drive parameters easier because
       * we can use a consistant interface.
       */
      {
        int off = arg & ~0x100;
  
        /* Copy the data from the array to the fdp
         */
        fdp->sectors_per_track = fd_data[off].sectors;
        fdp->cylinders_per_disk = fd_data[off].cylinders;
        fdp->tracks_per_cylinder = fd_data[off].heads;
        fdp->gap = fd_data[off].gap;
        fdp->format_gap = fd_data[off].format_gap;
        fdp->data_length = fd_data[off].data_len;
  
        fdp->number_of_blocks = fdp->sectors_per_track *
          fdp->cylinders_per_disk * fdp->tracks_per_cylinder;
        fdp->sectors_per_cylinder = fdp->sectors_per_track *
          fdp->tracks_per_cylinder;
      }
      break;
  
    case FDREAD_DATA:
      /*  This reads data off the diskette.  It finishes setting
       * up the the request block and then calls the ABIOS 
       * proper ABIOS interface (polled, or non-polled).
       *
       *  The data pointers should be set up before this is
       * called.
       *
       * NOTE: the retry count is controlled by fdio().
       */
      FDDEBUG(FDCMD, printf("fdissue_command: READ_DATA\n"));
  
      FD_SET_RESERVED_ABIOS_READ(fdreq);
      fdreq->r_unit = fd_drive(fdp->device_number);
  
      fd_num_sector_rw(fdreq) = fdp->start.transfer_length /
        fdp->bytes_per_sector;
      fd_cylinder_num(fdreq) = fdp->start.cylinder;
      fd_head_num(fdreq) = fdp->start.head;
      fd_sector_num(fdreq) = fdp->start.sector;
  
      FDDEBUG(FDCMD, printf("vaddr: %x\n",fd_data_ptr_1(fdreq)));
      FDDEBUG(FDCMD, printf("paddr: %x\n",fd_data_ptr_2(fdreq)));
      FDDEBUG(FDCMD, printf("# sectors: %d\n",
                            fdp->start.transfer_length / fdp->bytes_per_sector));
      FDDEBUG(FDCMD, printf("cylinder: %d\n",fdp->start.cylinder));
      FDDEBUG(FDCMD, printf("head: %d\n",fdp->start.head));
      FDDEBUG(FDCMD, printf("sector: %d\n",fdp->start.sector));
  
      rc = (poll)         ? fdcall_abios_poll(ABIOS_READ,fdreq, TRUE)
                          : fdcall_abios(ABIOS_READ, fdreq);
      break;
  
    case FDWRITE_DATA:
      /*  This writes data to the diskette.  It finishes setting
       * up the the request block and then calls the ABIOS 
       * proper ABIOS interface (polled, or non-polled).
       *
       *  The data pointers should be set up before this is
       * called.
       *
       * NOTE: the retry count is controlled by fdio().
       */
      FDDEBUG(FDCMD, printf("fdissue_command: WRITE_DATA\n"));
  
      FD_SET_RESERVED_ABIOS_READ(fdreq);
      fdreq->r_unit = fd_drive(fdp->device_number);
      fd_num_sector_rw(fdreq) = fdp->start.transfer_length /
        fdp->bytes_per_sector;
      fd_cylinder_num(fdreq) = fdp->start.cylinder;
      fd_head_num(fdreq) = fdp->start.head;
      fd_sector_num(fdreq) = fdp->start.sector;
  
      FDDEBUG(FDCMD, printf("vaddr: %x\n",fd_data_ptr_1(fdreq)));
      FDDEBUG(FDCMD, printf("paddr: %x\n",fd_data_ptr_2(fdreq)));
      FDDEBUG(FDCMD, printf("# sectors: %d\n",
                            fdp->start.transfer_length / fdp->bytes_per_sector));
      FDDEBUG(FDCMD, printf("cylinder: %d\n",fdp->start.cylinder));
      FDDEBUG(FDCMD, printf("head: %d\n",fdp->start.head));
      FDDEBUG(FDCMD, printf("sector: %d\n",fdp->start.sector));
      
      rc = (poll) ? fdcall_abios_poll(ABIOS_WRITE, fdreq, TRUE)
                  : fdcall_abios(ABIOS_WRITE, fdreq);
      break;
  
    case FDMOTOR_OFF:
      /*  This does an ABIOS request to turn the motor (and
       * the light) for the drive off.
       */
      FD_SET_RESERVED_ABIOS_FD_TURN_OFF_MOTOR(fdreq);
      fdreq->r_unit = fd_drive(fdp->device_number);
      fd_no_retry(fdp);
  
      rc = fdcall_abios_poll(ABIOS_FD_TURN_OFF_MOTOR, fdreq, TRUE);
      /* RC Falls through to break */
  
      /*  fdcall_abios_poll() will call fdsched() {like it shoud}
       * and restart the motor watchdog.
       */
      UNTIMEOUT(fdadapter.mot_wd);
      break;
  
    case FDFORMAT_TRACK:
      /*  This does and ABIOS request to format a track.  It
       * has to create an xmem descriptor and get the physical
       * address of the format information.
       *
       *  It fills in the request block and does the format
       * to how the drive was set up (high or low, etc).
       */
      FDDEBUG(FDCMD,"fdissue_command: FDFORMAT_TRACK\n");
  
      FD_SET_RESERVED_ABIOS_FD_SET_MEDIA_TYPE(fdreq);
      fdreq->r_unit = fd_drive(fdp->device_number);
  
      fd_sectors_per_track(fdreq) = fdp->sectors_per_track;
      fd_bytes_per_sector(fdreq) = fdp->e_bytesps;
      fd_num_of_cylinders(fdreq) = fdp->cylinders_per_disk;
      fd_format_fill_byte(fdreq) = fdp->fill_byte;
      fd_format_gap_len(fdreq) = fdp->format_gap;
  
      fd_no_retry(fdp);           /* don't try again */
  
      rc = fdcall_abios_poll(ABIOS_FD_SET_MEDIA_TYPE, fdreq, FALSE);
      if (rc != FDSUCCESS) {
        break;
      }
  
      fd_xfer_sub_function(fdreq) = FD_XFER_SUB_FORMAT;
      fd_cylinder_num(fdreq) = fdp->cylinder_id;
      fd_head_num(fdreq) = fdp->head_id;
  
      fd_clear_retry(fdp);                /* retry this request */
  
      rc = (poll) ? fdcall_abios_poll(ABIOS_ADDITIONAL_XFER, fdreq, TRUE)
                  : fdcall_abios(ABIOS_ADDITIONAL_XFER, fdreq);
  
      break;
  
    case FDDISK_SAME:
      /*  Check to see if the Change signal is high.  In order
       * to return a value w/o using the fdp structure, we use
       * two return codes that are > 0, and will look like
       * errors.  fdexecute_command() will see the error and
       * try to schedule more work for the diskette adapter
       * to do.
       *
       *  Note that we first check to see if the change signal
       * is supported.  If it is not supported with the current
       * drive, then we just say the diskette is the same.
       */
      if (!(fdp->abios_flags & FD_CHANGE_SIGNAL_AVAIL)) {
        rc = DISK_SAME;
        break;
      }
  
      FD_SET_RESERVED_ABIOS_FD_CHANGE_SIGNAL_STATUS(fdreq);
      fdreq->r_unit = fd_drive(fdp->device_number);
                  
      fdcall_abios_poll(ABIOS_FD_CHANGE_SIGNAL_STATUS,fdreq,FALSE);
  
      /*  If the diskette changed signal is high report it.  If
       * no say the diskette is the same, even though this drive
       * may not support it.
       */
      if (fd_change_signal_status(fdreq) == FD_CHANGE_SIGNAL_ACTIVE)
        rc = DISK_CHANGED;
      else
        rc = DISK_SAME;
      break;
  
    case FD_SETDP:
      /*  This call does a "Set Device Parameters" ABIOS call
       * and is used by the one of the ioctl()'s.
       */
      FD_SET_RESERVED_ABIOS_WRITE_PARAMETER(fdreq);
      fd_bytes_per_sector(fdreq) = fdp->e_bytesps;
      fd_rwv_gap_len(fdreq) = fdp->gap;
      fd_data_len(fdreq) = fdp->data_length;
  
      fdreq->r_unit = fd_drive(fdp->device_number);
  
      rc = fdcall_abios_poll(ABIOS_WRITE_PARAMETER, fdreq, FALSE);
  
      if (rc == FDSUCCESS) {
        switch(fdp->e_bytesps) {
        case FD_256_BYTE_PER_SECTOR:
          fdp->bytes_per_sector = 256;
          break;
        case FD_512_BYTE_PER_SECTOR:
          fdp->bytes_per_sector = 512;
          break;
        default:
          fdlog_error(fdp,FD_UNSUP_SECT);
          rc = EIO;
        }
      }
      break;
  
    case FD_SETMT:
      /*  This call does a "Set Media Type for Format" ABIOS call
       * and is used by one of the ioctl's.  It is done at this
       * time instead of waiting till a format occurs to make
       * sure the data given is valid.
       */
      FD_SET_RESERVED_ABIOS_FD_SET_MEDIA_TYPE(fdreq);
      fd_sectors_per_track(fdreq) = fdp->sectors_per_track;
      fd_bytes_per_sector(fdreq) = fdp->e_bytesps;
      fd_num_of_cylinders(fdreq) = fdp->cylinders_per_disk;
      fd_format_fill_byte(fdreq) = fdp->fill_byte;
      fd_format_gap_len(fdreq) = fdp->format_gap;
      
      fdreq->r_unit = fd_drive(fdp->device_number);
  
      rc = (poll) ? fdcall_abios_poll(ABIOS_FD_SET_MEDIA_TYPE,fdreq,TRUE)
                  : fdcall_abios(ABIOS_FD_SET_MEDIA_TYPE, fdreq);
      break;
  
    default:
      FDDEBUG(FDCMD, printf("fdissue_command: unknown command\n"));
      rc = EINVAL;
      break;
    }
    return (rc);
  }
  
  /*  Handles the diskette timer exceptions. This routine is called when
   * when a watchdog timer pops.  It then determines the proper actions to
   * take and does them. 
   *
   *  There are 2 types of watchdogs.  There is one to turn the motor off,
   * and one for lost interrupts.  The motor timer is easy, but the interrupt
   * timer is harder because it can mean different things depending on the
   * state of the drive, and the type of drive.
   *
   * NEEDS WORK: IS THE FOLLOWING STILL NEEDED, AND/OR TRUE WITH OSF?
   * NOTES: It is assumed that the interrupt level when the timer pops will
   * splfd().
   */
  void 
  fdtimer(timer)
       register struct fdwatchdog *timer;
  {
    register struct floppy *fdp;
    int rc;
  
    switch (timer->type) {
    case FDINT_WD:
      /*  In this case an ABIOS request that should have finished
       * did not within the recommended timeout.  We log the
       * error, and then try to keep going...
       */
      FDDEBUG(FDCMD,printf("interrupt watchdog!\n"));
      fdp = fdadapter.int_wd.fdp;
  
      /*  We need to finish up with the request block early
       * incase we have to do any ABIOS calls later.
       */
      rc = fdadapter.fd_req.r_return_code;
      abios_common_timeout(&fdadapter.fd_req, fdadapter.fd_flag);
      fdadapter.fd_req.r_return_code = rc;
  
      /*  If the watchdog timeout came on the 5 1/4" drive
       * then it could be that the media is not present,
       * because this drive cannot sense the diskette is not
       * there.  Unfortunatly there is no good way to test
       * this.
       *
       *  The best we can do is in fddoor_check() is to set
       * a flag in the fdp structure, and if we get a watchdog
       * on a 5 1/4" drive and the flag is set, then we return
       * EIO.
       *
       *  The other problem encountered on the 5 1/4 is when
       * doing a format, without the diskette in the drive.
       * It looks like ABIOS doesn't do the reset so we do
       * it ourselves.  This only happens when opening NDELAY
       * since the drive isn't checked with a read.
       */
      if ((minor(fdp->device_number) & FD_5) && ((fdp->open_check == TRUE) ||
          (fdadapter.fd_req.r_function == ABIOS_ADDITIONAL_XFER) ) ) {
        fdlog_error(fdp,FD_ERR_NOMEDIA);
        rc = EIO;
      }
      else {
        /* Log timeout error. 
         */
        fdlog_error(fdp, FD_ERR_LOSTINT);
        fdp->timeout_flag = TRUE;
        rc = EIO;
      }
  
      /*  If we need to recalibrate (5 1/4" disk) then set up and
       * do the reset (note that this will do the fdiodone() for
       * us.  Otherwise call fdiodone().
       */
      if (fdp->abios_flags & FD_RECALIBRATE_REQUIRED) {
        register struct Fd_request *rb;
  
        rb = &fdadapter.fd_req;
        rb->state |= FD_RB_RESET;
        rb->req_errno = rc;
        fdcall_abios(ABIOS_RESET, rb);
      }
      else
        fdiodone(fdp->headptr, &fdadapter.fd_req, fdp, rc);
  
      break;
  
    case FDMOT_WD:
      /*  Note:  In this case the light is on.  All care has
       * been taken not to let the watchdog continue if this
       * drive is busy.  Hence we don't (and can't sleep())
       * call fdget_adapter(), and can just turn off the light.
       */
      FDDEBUG(FDCMD,printf("fdtimer: motor watchdog!\n"));
      fdadapter.fdintr_status = FDBUSY;
      fdexecute_command(fdadapter.mot_wd.fdp,FDMOTOR_OFF);
      break;
    }
  }
  
  #ifdef DEBUG
  #undef DEBUG_RB
  #ifdef DEBUG_RB
  
  /*  This can be compiled in for printing out AIBOS request blocks for driver
   * debugging.
   */
  static void
  fd_dump_rb(rb)
       struct Fd_request *rb;
  {
    register int i,j;
  
    printf("RB: len %d, lid %d, unit %d, func %\n",
           rb->r_current_req_blck_len,
           rb->r_logical_id,
           rb->r_unit,
           rb->r_function);
    printf("flags %d, ELA %d, rc %d, timeout %d\n",
           rb->request_header.Request_Block_Flags,
           rb->request_header.ELA_Offset,
           rb->r_return_code,
           rb->r_time_out);
          
    for (i=0 ; i < 128 ; i += 24) {
      for (j = 0 ; j < 24 ; j += 4)
        printf("%02x%02x%02x%02x  ",
               rb->un.uc[i+j],
               rb->un.uc[i+j+1],
               rb->un.uc[i+j+2],
               rb->un.uc[i+j+3]);
      printf("\n");
    }
                  
    printf("state %x, sleep %x, req_errno %d\n",
           rb->state, rb->sleep_on_intr, rb->req_errno);
  }
  #endif
  #endif
  
  
  /*  If DEBUG is on we also want to leave some hooks in to test the
   * watchdog timers for losing interrupts.  To test losing an interrupt,
   * have fd_inttest set to a non-zero value.
   *
   *  The best way to do this is to set a breakpoint in fdintr() and then
   * set the flag to 1 on the interrupt you want to simulate the loss of.
   *
   * WARNING -- Don't forget to set this flag back to 0, or nothing works!
   */
  #ifdef DEBUG
  #define WATCHTEST
  #endif
  #ifdef WATCHTEST
  int fd_inttest = 0;
  #endif
  
  /*  This is the front end to the common interrupt handler for ABIOS
   * stage on time (stot) events.  When ABIOS tells us to stage on 
   * time we call timeout() which will set a timer to call fd_stot()
   * after the period has expired.
   *
   *  We call fdcommon_intr() which will query ABIOS with what to do next.
   * The one parameter to this routine is a pointer to the ABIOS request
   * block.
   */
  void
  fd_stot()
  {
    int pri;
  
    FDDEBUG(FDINTR, printf("fd_stot: entering...\n"));
    pri = splfd();
    fdcommon_intr(&fdadapter.fd_req);
    splx(pri);
  }
  
  /*  This is the interrupt handler for the diskette controller.  It calls
   * fdcommon_intr with the current ABIOS request block to do most of the
   * work.  If this call corresponds to our interrupt, then we i_reset()
   * it, and in either case we return the return value from fdcommon_intr().
   *
   * NOTES: Turn off the interrupt watchdog.
   */
  fdintr(fdtmp)
       register struct intr *fdtmp;
  {
    /*  We have gotten our interrupt so turn off the timer ASAP.
     */
    UNTIMEOUT(fdadapter.int_wd);
  
    FDDEBUG(FDINTR, printf("\nfdintr: entering...\n"));
  
    fdcommon_intr(&fdadapter.fd_req);
  
    return(1);            /* return to FLIH */
  }
  
  /*  Handles an interrupt for the floppy driver.  First we check
   * to make sure we are expecting an interrupt.  If so we call
   * abios_common_interrupt() to process the interrupt.  Next we
   * do what abios_common_interrupt() told us to do.
   *
   *  When we have an ABIOS_DONE condition we call fdiodone() to terminate
   * the i/o for us.
   */
  static int
  fdcommon_intr(fdreq)
       register struct Fd_request *fdreq;
  {
    register struct buf *bp;
    register struct floppy *fdp;
  
    FDDEBUG(FDINTR, printf("\nfdcommon_intr: entering...\n"));
  
    /*  Get data structures pointing at the right place.  Note that
     * the bp may be NULL if FD_RB_SYNC bit is set in the request
     * block.  In anycase if FD_RB_SYNC is set the bp should not
     * be used.
     */
    fdp = &floppies[fdreq->r_unit];
    bp = fdp->headptr;
  
    /* Make sure we are expecting an interuupt
     */
    if ( (fdreq->state==FD_RB_IDLE) || (fdreq->r_return_code==ABIOS_UNDEFINED))
      return(0);                  /* not me! */
  
    abios_common_interrupt(fdreq, fdadapter.fd_flag);
    FDDEBUG(FDINTR, {
            printf("fdcommon_intr: after abios_common_interrupt rc=0x%x [",
                   fdreq->r_return_code);
            fd_error_decode(fdreq->r_return_code, "]\n"); });
  
  #ifdef WATCHTEST
    /* For more info about watchdog testing, see above comment.
     */
    if (fd_inttest) {             /* if true loose interrupt */
      return(0);
    }
  #endif
  
    /*  If ABIOS_NOT_MY_INT and ABIOS_STAGE_ON_INT are both set in the
     * return code from abios_common_start(), then the interrupt
     * is not ours.  Return and let the slih go through the list
     * of devices on this interrupt level.
     */
    if ( fdreq->r_return_code & (ABIOS_NOT_MY_INT & ABIOS_STAGE_ON_INT) ) {
      FDDEBUG(FDINTR, printf("fdcommon_intr: ABIOS_NOT_MY_INTR\n"));
      return(0);                          /* not me either! */
    }
  
    /*  Now check the various cases of the return code and do the
     * appropriate action.
     */
    switch (fdreq->r_return_code) {
    case ABIOS_DONE:
      /*  The request has completed successfully.  For read
       * and write we have to update some counters, but for
       * all other cases we're done.
       */
      FDDEBUG(FDINTR,printf("fdcommon_intr: ABIOS_DONE\n"));
  
      if ((fdreq->r_function == ABIOS_READ) ||
          (fdreq->r_function == ABIOS_WRITE)) {
  
        /*  Keep track of the number of sectors moved,
         * as well as updating the modified_bcount (used
         * for counting the i/o on strategy requests).
         */
        fdp->sectors_done += fd_sectors_moved(fdreq);
        fdp->modified_bcount -= fd_sectors_moved(fdreq) * fdp->bytes_per_sector;
  
        /* check if all sectors were moved
         */
        if ( fd_sectors_moved(fdreq) <
            fd_num_sector_rw(fdreq) ) {
          fdiodone(bp,fdreq,fdp,EIO);
        }
        /* Check for a split request.
         *
         *  A request is split if it goes from sector that
         * is one head and is continued on the next head.
         *
         *  The other case is when the place to dma to/from
         * crosses a page boundry that is not contiguous
         * in physical memory.
         *
         * See fdsetup_transfer()
         *
         *  Note that the convention for polled r/w calls
         * is that they will not set up split transfers,
         * hence it is legal for us to call fdstartio and
         * then indirect through the buf struct pointer.
         */
        else if (fdp->transfer_split != 0) {
          FDDEBUG(FDINTR,printf("split request\n"));
  
          /* Update the offset so the address to
           * move to can be determined correctly
           */
          fdp->buf_offset += fd_sectors_moved(fdreq) * fdp->bytes_per_sector;
  
          /*  If we have more of this transfer to do,
           * then start the i/o for it.
           */
          if (fdsetup_transfer(fdp))
            fdstartio(fdp);
          break;          /* don't do fdiodone()! */
        }
      }
  
      /*  If the RESET flag is set, that means we have just
       * completed a special RESET for an error condition
       * (probably on the 5 1/4" drive).  Flip the RESET bit
       * off and call fdiodone with the set errno.
       */
      if (fdreq->state & FD_RB_RESET) {
        fdreq->state &= ~FD_RB_RESET;
        fdiodone(bp,fdreq,fdp,fdreq->req_errno);
      }
      else
        fdiodone(bp,fdreq,fdp,FDSUCCESS);
      break;
  
    case ABIOS_STAGE_ON_INT:
      /*  Discrete multi stages, just continue.  Eventualy
       * we will get a done or some sort of errors.
       */
      FDDEBUG(FDINTR, printf("fdcommon_intr: ABIOS_STAGE_ON_INT\n"));
      fdreq->state |= FD_RB_STAGING;
      break;
  
    case ABIOS_STAGE_ON_TIME:
      /*  In this case we want to call fd_stot in fd_wait_time()
       * micro seconds.
       */
      FDDEBUG(FDINTR, printf("fdcommon_intr: ABIOS_STAGE_ON_TIME\n"));
      timeout(fd_stot,(caddr_t)NULL,us2tics(fd_wait_time(fdreq)));
      break;
  
    case FDABIOS_MEDIACHANGED:
      /*  If this is our first request to the drive, this
       * this is a retryable error (and the only way to
       * clear the signal).
       *
       *  However, if this is not the first request for this open
       * it is an error to have changed media.
       */
      FDDEBUG(FDINTR, printf("fdcommon_intr: FDABIOS_MEDIACHANGED\n"));
  
      /* to boot from floppy, have to allow media to change... */
      fdissue_command(fdp,fdreq->r_function);
      break;
      if (fdp->fd_change == FDCHANGE_NEW) {
        fdp->fd_change = FDCHANGE_INIT;
        fdissue_command(fdp,fdreq->r_function);
      }
      else {
        /* return media changed error
         */
        fdlog_error(fdp,FD_ERR_CHMEDIA);
        fdiodone(bp,fdreq,fdp,EIO);
      }
      break;
  
    case FDABIOS_MEDIANOTPRESENT:
      /*  This is an obvious error condition.
       */
      fdlog_error(fdp,FD_ERR_NOMEDIA);
      fdiodone(bp,fdreq,fdp,EIO);
      break;
  
    case FDABIOS_WRITEPROTECTED:
      /*  The diskette was write protected and we attempted to
       * do a write to it.  Return EIO (no write protected errno).
       */
      FDDEBUG(FDINTR,printf("fdcommon_intr: WRITE PROTECTED\n"));
      fdiodone(bp,fdreq,fdp,EIO);
      break;
  
    default:
      /*  All the errors get handled here.  Retry the error.
       * up to FDMAXRETRIES, and if all is still lost, return
       * EIO.
       */
      FDDEBUG(FDINTR, printf("fdcommon_intr: error (rc=%x)\n",
                             fdreq->r_return_code));
  
      if (fdp->retry_count < FDMAXRETRIES) {
        fdp->retry_count++;
        fdissue_command(fdp,fdreq->r_function);
      }
      else {
        /*  We're out of retries, so log the error.  If
         * the error is on the 5 1/4" drive reset the     
         * drive.  Note that resetting the drive will
         * call fdiodone for us.
         */
        fdlog_error(fdp,FD_ERR_RETRY);
  
        if (fdp->abios_flags & FD_RECALIBRATE_REQUIRED) {
          fdreq->state |= FD_RB_RESET;
          fdreq->req_errno = EIO;
          fdcall_abios(ABIOS_RESET,fdreq);
        }
        else
          fdiodone(bp,fdreq,fdp,EIO);
      }
      break;
  
    }
  
    FDDEBUG(FDINTR, printf("fdcommon_intr: done\n"));
    return(1);
  }
  
  /* NEEDS WORK - are polled interrupt abios requests still done now
   * NEEDS WORK - that we call strategy to sense the media?
   */
  /*  Completes the i/o for the specified request.  Handles two different
   * cases.  One for polled requests, and one for non-polled (from strategy)
   * requests.
   *
   * NOTES: This should only be used after i/o has been attemped on the
   * buf struct in question.  Before that time just call iodone() directly.
   */
  static void
  fdiodone(buf,fdreq,fdp,errno)
       register struct buf *buf;
       register struct Fd_request *fdreq;
       register struct floppy *fdp;
       int errno;
  {
    if ( (fdreq->state & FD_RB_SYNC) || (buf == NULL) ) {
      /* Polled request:
       *
       *  The error code is returned to the caller in req_errno.
       *
       *  We need to set ABIOS_DONE, so that polled requests
       * will wake up even if we have an error.  req_errno is
       * used to handle the error conditions.
       *
       *  Also note that any outstanding requests will be started
       * up after the request is woken up.  It would be better to
       * be able to check the queues here, and then start the
       * requests, but we have to wait for the data to get back
       * to the caller of the polled request.
       */
      FDDEBUG(FDINTR, printf("fdiodone: entering...polled\n"));
      fdreq->req_errno = errno;
      fdreq->r_return_code = ABIOS_DONE;
      wakeup(&fdreq->sleep_on_intr);
    }
    else {
      /* Strategy request:
       *
       *  This is a little more complicated than the polled
       * request.  We check for errors, and for people to 
       * wake up, play with the queue's and then look for
       * more work to do.
       *
       *  Note that we can use the buf struct in this case.
       */
      FDDEBUG(FDINTR, printf("fdiodone: entering...intr\n"));
  
      /*  If this request resulted in an error, then set
       * the flags in the buf struct to indicate the error.
       */
      if (errno) {
        buf->b_resid += fdp->modified_bcount;
        buf->b_flags |= B_ERROR;
        buf->b_error = errno;
      }
      else {
        /*  we have had a succesful non-polled call, so 
         * note that the diskette is in ok.
         */
        fdp->fd_change = FDCHANGE_INIT;
      }
  
      /*  Tally i/o counts:
       *  - read_count_bytes is the number of bytes less
       *  than a megabyte read.  read_count_megabytes is
       *  the number of megabytes read.  By using both of
       *  them together, you get an accurate #.
       *
       *  - write_count* is the same, but for write operations.
       */
      if (buf->b_flags & B_READ) {
        fdp->read_count_bytes += buf->b_bcount - buf->b_resid;
        if (fdp->read_count_bytes >= 0x100000) {
          fdp->read_count_megabytes += fdp->read_count_bytes / 0x100000;
          fdp->read_count_bytes %= 0x100000;
        }
      }
      else {              /* B_WRITE */
        fdp->write_count_bytes += buf->b_bcount - buf->b_resid;
        if (fdp->write_count_bytes >= 1000000) {
          fdp->write_count_megabytes += fdp->write_count_bytes / 1000000;
          fdp->write_count_bytes %= 1000000;
        }
      }
  
      /* if this is the last buffer, dq everything, else
       * get the next one...
       */
      if (fdp->headptr == fdp->tailptr) {
        fdp->headptr = fdp->tailptr = NULL;
  
        /*  If fd_close() has been called with outstanding
         * i/o on this drive the the close_waiting flag
         * will be set.  We have to wake up the process
         * that is waiting on the close and indicate that
         * it's i/o is done.
         *
         *  Note that we only do this when the request
         * queue is empty, and there is no more
         * outstanding i/o for this drive.
         */
        if (fdp->close_waiting == TRUE) {
          fdp->close_waiting = FALSE;
          wakeup(&fdp->close_sleep);
        }
      }
      else
        fdp->headptr = fdp->headptr->av_forw;
  
      FDDEBUG(FDINTR,printf("fdiodone: fdp->headptr is %x\n", fdp->headptr));
  
      fd_sched(fdp);              /* look for more requests */
      iodone(buf);                /* done with this buffer */
    }
  }
  
  /* Looks for more work for the diskette adapter to work on.
   */
  static void
  fd_sched(fdp)
       register struct floppy *fdp;
  {
    register struct floppy *tfdp, *lfdp;
    int unit, pri;
  
    /*  Handle watchdog timers:
     *    - Make sure the interrupt loss watchdog is off.  If we
     *      are finishing a request via an interrupt it will be
     *      off, but if we are doing a non interrupting ABIOS call
     *      it may not.  It is low enough overhead, so we just
     *      do it again.
     *
     *    - Start the motor off timer.  If we start another request this
     *      timer will be turned off.
     */
    UNTIMEOUT(fdadapter.int_wd);
    fdadapter.mot_wd.fdp = fdp;
    TIMEOUT(fdadapter.mot_wd);
  
    /*  If we need the controller to process an open, give
     * that presedence over other q'ed requests.  Otherwise
     * go and look for other requests to do.
     */
    pri = splfd();
    if (fdadapter.need_controller == TRUE) {
      fdadapter.fdintr_status = FDFREE;
      wakeup(&fdadapter.need_sleep);
    }
    else {
      /*  Look for another request to start.  To be fair try
       * the other drives first.
       */
      tfdp = &floppies[unit=next_unit(fdadapter.fd_req.r_unit)];
      lfdp = (struct floppy *)NULL;
      while (lfdp != fdp) {
        if (tfdp->headptr != NULL) {
          /*  Do the request, and then
           * don't loop looking for more
           */
          fdio(tfdp->headptr);
          break;
        }
        lfdp = tfdp;
        tfdp = &floppies[next_unit(unit)];
      }
  
      /*  If we didn't run anything new, then set the intr
       * status to free and wake up any polled requests that
       * want to access the adapter.
       */
      if (lfdp == fdp)
        fdadapter.fdintr_status = FDFREE;
    }
    splx(pri);
  }
  
  /*
   * This does the work of an FDIOCFORMAT ioctl call. 
   *
   * The following ioctl operations are provided for the format
   * command. 
   *
   * FDIOCFORMAT - formats a diskette track.  A track is
   * formatted using values passed in an array of bytes
   * pointed to by the 'arg' parameter.  The buffer should be
   * 4 times the number of sectors per track long.  Four bytes
   * of data are needed for each sector on the track.  The
   * following shows the structure of the data buffer:
   *                       _________________
   *                      |                 |
   *                      | cylinder number | - byte 0
   *              S       |_________________|
   *              E       |                 |
   *              C       |   side number   | - byte 1
   *              T       |_________________|
   *              O       |                 |
   *              R       |  sector number  | - byte 2
   *                      |_________________|
   *              0       |                 |
   *                      | # bytes/sector  | - byte 3
   *                      |_________________| 
   *
   *                              .
   *                              .
   *                              .
   *                       _________________
   *                      |                 |
   *                      | cylinder number | - byte (n * 4) - 4
   *              S       |_________________|
   *              E       |                 |
   *              C       |   side number   | - byte (n * 4) - 3
   *              T       |_________________|
   *              O       |                 |
   *              R       | sector number   | - byte (n * 4) - 2
   *                      |_________________|
   *              n       |                 |
   *                      | # bytes/sector  | - byte (n * 4) - 1
   *                      |_________________| 
   *
   *    where n is the number of sectors per track.  In general,
   * the cylinder number, side number, and number of bytes per
   * sector should not change from sector to sector. The sector
   * number should be different for each sector. Usually the
   * sector numbers will correspond to the physical sector
   * numbers, but they can be different if some special copy
   * protection scheme is being used. 
   */
  #ifdef NEEDS_WORK               /* NEEDS WORK -- more ioctls..later */
  static int
  fd_iocformat(devno,arg,fdp)
       dev_t devno;
       register long arg;
       register struct floppy *fdp;
  {
    int rc = FDSUCCESS;
    caddr_t paddr;
    struct Fd_request *fdreq = &fdadpter.fd_req;
  
    fdp->format_size = fdp->sectors_per_track * 4;
  
    /* allocate a page for the format info.
     */
    fdp->format_buffer = (char *)
      xmalloc(fdp->format_size, PGSHIFT, pinned_heap);
    if (fdp->format_buffer == NULL)
      return(ENOMEM);
  
    /* pin the buffer.
     */
    rc = pin((caddr_t) fdp->format_buffer, (int) fdp->format_size);
    if (rc != 0) {
      xmfree((caddr_t) fdp->format_buffer, (caddr_t) pinned_heap);
      return(rc);         /* return pin's errno */
    }
  
    /* copy the buffer in our address space.
     */
    rc = copyin((char *) (arg), (char *) (fdp->format_buffer),
                fdp->format_size);
    if (rc == -1) {
      unpin((caddr_t) fdp->format_buffer, (int) fdp->format_size);
      xmfree((caddr_t) fdp->format_buffer, (caddr_t) pinned_heap);
      return(EINVAL);
    }
  
    fdp->cylinder_id = *(fdp->format_buffer);             /* byte 0 */
    fdp->head_id = *((char *)(fdp->format_buffer)+1);     /* byte 1 */
  
    fdget_adapter();
          
    if ((paddr = pmap_extract(kernel_pmap,fdp->format_buffer)) == 0) {
      free(fdp->format_buffer);
      return(EIO);
    }
    fd_data_ptr_1(fdreq) = (u_int) fdp->format_buffer;
    fd_data_ptr_2(fdreq) = (u_int) paddr;
  
    rc = fdexecute_command(fdp,FDFORMAT_TRACK_POLL);
  
    unpin((caddr_t) fdp->format_buffer, (int) fdp->format_size);
    xmfree((caddr_t) fdp->format_buffer, (caddr_t) pinned_heap);
  
    return(rc);
  }
  #endif
  
  /* Does the work for a FDIOCSINFO ioctl.
   *
   *      FDIOCSINFO - sets the current diskette characteristics.
   *      A structure of type fdinfo is loaded with the desired   
   *      values and a pointer to this structure must be passed
   *      to the device driver in the 'arg' parameter. 
   *
   * NOTES: This routine is fairly hardcoded with values for the various
   * formats of the 2 drives and will have to be updated when new drives
   * or formats are added.
   */
  #ifdef NEEDS_WORK               /* NEEDS WORK -- ioctl stuff...later */
  static int
  fd_iocsinfo(fdp,arg)
       register struct floppy *fdp;
       register long arg;
  {
    register struct fdinfo *fdinfop;
    int tmp;
    int rc = FDSUCCESS;
  
    /* Allocate an fdinfo structure. */
    fdinfop = (struct fdinfo *) malloc(sizeof(struct fdinfo));
  
    if (fdinfop == NULL)
      return(ENOMEM);
  
    /* Call copyin to get the fdinfo structure from the user. 
     */
    tmp = copyin((char *) (arg), (char *) (fdinfop), sizeof(struct fdinfo));
    if (tmp == -1) {
      free(fdinfop);
      return(EINVAL);
    }
  
    /*  Make sure the request has the correct drive type.  If not there
     * must be a user error.
     */
    if (fdp->drive_type != fdinfop->type) {
      free(fdinfop);
      return(EINVAL);
    }
  
    switch (fdinfop->type) {
    case D_48:            /* 360K, 5.25" drive */
      switch (fdinfop->ncyls) {
      case 40:    /* 360K diskette */
        if ( (fdinfop->sides == 2) && (fdinfop->nsects == 9) )
          rc = fdload_floppy(fdp,FDLOAD_360);
        else
          rc = EINVAL;
        break;
        /*  The 1.2M diskette is not currently supported, but this
         * will be handy if one does come up.
         */
      case 80:    /* 1.2M diskette -- not supported */
        if ( (fdinfop->nsects != 15) || (fdinfop->sides != 2) )
          rc = EINVAL;
        else
          rc = EINVAL;
        break;
      default:
        rc = EINVAL;
        break;
      }
      break;
  
    case D_135H:  /* 1.44M, 3.5" drive */
      if ((fdinfop->sides != 2) || (fdinfop->ncyls != 80))
        rc = EINVAL;
      else {
        switch (fdinfop->nsects) {
        case 9:           /* 720K diskette */
          rc = fdload_floppy(fdp, FDLOAD_720);
          break;
        case 18:  /* 1.44M diskette */
          rc = fdload_floppy(fdp,FDLOAD_144);
          break;
        default:
          rc = EINVAL;
          break;
        }
      }
      break;
    default:
      rc = EINVAL;
      break;
    }
  
    if (rc == FDSUCCESS)
      fdp->drive_type = (u_char) fdinfop->type;
  
    free((caddr_t) fdinfop);
  
    return(rc);
  }
  #endif
  
  /* Does a FDIOCSTATUS ioctl.
   *
   *      FDIOCSTATUS - returns the status of the diskette drive and
   *      device driver.  A pointer to a structure of type fd_status
   *      should be be passed in the 'arg' parameter.  The driver
   *      status will be loaded into the fd_status structure
   *      The result phase portion of the status is only
   *      valid if the device driver was opened in raw mode. 
   *      otherwise, there is no way of knowing to which i/o
   *      operation the result phase corresponds. 
   *
   * NEEDS WORK - In our ABIOS implementation there are fields in the fd_status
   * struct that are not used.  Let's see about cleaning them up.
   */
  #ifdef NEEDS_WORK               /* NEEDS WORK -- ioctl's */
  static int
  fd_iocstatus(fdp,arg)
       register struct floppy *fdp;
       long arg;
  {
    register struct fd_status *fdstatusp;
    int rc = FDSUCCESS;
    int tmp;
  
    FDDEBUG(FDIOCTL, printf("fdioctl: FDIOCSTATUS\n"));
  
    /* Allocate an fd_status structure. */
  
    fdstatusp = (struct fd_status *) malloc(sizeof(struct fd_status));
  
    if (fdstatusp == NULL)
      return(ENOMEM);
  
    /* Start building the status1 bitmask with the drive number.
     */
    tmp = fddrive_val[fd_drive(fdp->device_number)];
  
    fdstatusp->status1 = (u_char) fdp->data_rate;
  
    /* Start building the status2 bitmask with the retry flag.
     */
    if (fdp->retry_flag)
      tmp = FDRETRY;
    else
      tmp = 0;
  
    if (fdp->timeout_flag == TRUE)
      tmp |= FDTIMEOUT;
  
    switch (fdp->drive_type) {
    case D_48:
      tmp |= FD5INCHLOW;
      break;
    case D_135H:
      tmp |= FD3INCHHIGH;
      break;
    default:
      break;
    }
  
    fdstatusp->status2 = (u_char) tmp;
    fdstatusp->status3 = fdp->diskette_type;
  
    fdstatusp->head_settle_time = fdp->head_settle_time;
    fdstatusp->motor_speed = 300;         /* On R2 1.44 its 300 */
    fdstatusp->Mbytes_read = fdp->read_count_megabytes;
    fdstatusp->Mbytes_written = fdp->write_count_megabytes;
  
    fdstatusp->cylinder_num = fdp->start.cylinder;
    fdstatusp->head_num = fdp->start.head;
    fdstatusp->sector_num = fdp->start.sector;
                  
    fdstatusp->bytes_num = fdp->sector_count * fdp->bytes_per_sector;
    fdstatusp->bytes_num = fdp->e_bytesps;
  
    fdget_adapter();
    tmp = fdexecute_command(fdp,FDDISK_SAME);
  
    switch(tmp) {
    case DISK_CHANGED:
      fdstatusp->dsktchng = TRUE;
      break;
    case DISK_SAME:
      fdstatusp->dsktchng = FALSE;
      break;
    default:
      /*  Unknown rc from command, so return an error.
       */
      free((caddr_t) fdstatusp);
      return(EIO);
    }
  
    /* Call copyout to copy the fd_status structure to the user
     */
    tmp = copyout((char *) (fdstatusp), (char *) (arg),
                  sizeof(struct fd_status));
    if (tmp == -1) {
      rc = EINVAL;
    }
  
    free((caddr_t) fdstatusp);
    return(rc);
  }
  #endif
  
  
  /*  Cleans up initialization stuff prior to exiting. This routine is
   * called just before exiting in fd_open and fd_close. 
   */
  static void 
  fdcleanup(fdp)
       struct floppy *fdp;
  {
    register int unit;
    int pri;
  
    /*  If our drive is still open, we're done otherwise turn off
     * the light.  If the other drives are also closed then reclaim
     * some system resources.
     */
    if (fdp != NULL) {
      if (fdp->drive_state & FDSTAT_OPEN)
        return;
  
      /*  If the adapter is free, get it, and turn off the
       * motor.  If the adapter is not free, something else
       * is going on, and hence we won't have to turn off
       * the light.
       */
      pri = splfd();
      if (fdadapter.fdintr_status == FDFREE) {
        fdget_adapter();
        splx(pri);
        fdexecute_command(fdp,FDMOTOR_OFF);
      }
      else
        splx(pri);
  
      for (unit=0 ; unit < FDMAXDRIVES ; unit++)
        if (floppies[unit].drive_state & FDSTAT_OPEN)
          return;
    }
  
    /* Reclaim some of the resources we were using.  If there is
     * activity on the diskette adapter we will not get this far.
     */
    /* NEEDS WORK -- do we really want to untimeout() on the
     * NEEDS WORK -- watchdog timers here??  This might cause
     * NEEDS WORK -- problems with they system if they arn't
     * NEEDS WORK -- on, but probably not....
     */
    UNTIMEOUT(fdadapter.mot_wd);
    UNTIMEOUT(fdadapter.int_wd);
  
    return;
  }
  
  /*
   *  Checks to see if the drive door is open.  To do this with
   * an ABIOS interface we read the first sector into memory.  This sector
   * is written back if we need to check for write protect.
   *
   * NOTES: We set fdp->open_check to TRUE to know when the 5 1/4" drive
   * does not have a diskette in it.  fdcall_abios_poll() will turn this
   * flag off.  See fdtimer() for further explination.
   */
  #if NEEDS_WORK
  static
  #endif
  int 
  fddoor_check(fdp, wrck)
       register struct floppy *fdp;
       int wrck;
  {
    struct buf *bp;
    int rc;
  
    FDDEBUG(FDCMD, printf("fddoor_check: entering...\n"));
  
    bp = geteblk(512);
  #ifdef OSF
    event_clear(&bp->b_iocomplete);
  #endif /* OSF */
    if (!bp) return(ENOMEM);
    bp->b_dev = fdp->device_number;
    bp->b_bcount = 512;
    bp->b_flags = B_READ;
    bp->b_blkno = 0;
    fdstrategy(bp);
  #if     MACH_KERNEL
    biowait(bp);
    rc = bp->b_error;
  #else
    rc = biowait(bp);
  #endif
    if (rc) goto dcdone;
  
    if (wrck) {
      bp->b_bcount = 512;
      bp->b_error = 0;
      bp->b_resid = 0;
                                  /* Added to fix B_INVAL for Mach 3.0 */
  
  #ifdef  MACH_KERNEL
      bp->b_flags = B_WRITE;
  #else   /* MACH_KERNEL */
      bp->b_flags = B_WRITE|B_INVAL;
  #endif  /* MACH_KERNEL */
      bp->b_blkno = 0;
  #ifdef OSF
      event_clear(&bp->b_iocomplete);
  #endif /* OSF */
      fdstrategy(bp);
  #if     MACH_KERNEL
      biowait(bp);
      rc = bp->b_error;
  #else
      rc = biowait(bp);
  #endif
    }
  
  dcdone:
    brelse(bp);
    return(rc);
  }
  
  /*  Loads the proper diskette characteristics.  The 2nd parameter is a
   * function for fdexecute_command(), which will do the actual loading.
   *
   *  There are actually 2 different ways that the fdp structure can be
   * populated.  After fdexecute_command() is done we do some sanity
   * checks.
   */
  static int 
  fdload_floppy(fdp,cmd)
       register struct floppy *fdp;
       int cmd;
  {
    int rc = FDSUCCESS;
    u_char drive_type;
  
    drive_type = fdp->drive_type;
  
    fdget_adapter();
  
    if ( (rc = fdexecute_command(fdp,cmd)) != FDSUCCESS )
      return(rc);
  
  #ifdef NEEDS_WORK               /* NEEDS WORK */
    /* NEEDS WORK -- ok.  We probably won't check drive_type anymore to
     * NEEDS WORK -- compare what it was configured for.  This routine
     * NEEDS WORK -- can probably drop to a macro like fdtype(), and we
     * NEEDS WORK -- should also make sure both fdtype and load_floppy
     * NEEDS WORK -- are really infact needed.
     */
    /* Is the drive type what it was configured for?
     */
    if (drive_type != fdp->drive_type)
      return(EINVAL);
  
    /* NEEDS WORK -- since drive_type is no longer configed,
     * NEEDS WORK -- this will have to change eventually.
     */
    switch(fdp->drive_type) {
    case D_135H:
      /*  If they wanted a 5 1/4 inch drive explicitly, then
       * we have an error because this is a 3 1/2 inch drive.
       */
      if (minor(fdp->device_number) & FD_5)
        rc = EINVAL;
      break;
    case D_48:
      /*  If they wanted a 3 1/2 inch drive explicitly, then
       * we have an error because this is a 5 1/4 inch drive.
       */
      if ((minor(fdp->device_number) & FD_5) == 0)
        rc = EINVAL;
      break;
    }
  #endif
  
    return (rc);
  }
  
  /*  Currently this is a no-op.
   */
  int 
  fdmincnt(bp)
       struct buf *bp;
  {
    return (0);
  }
  
  /*
   *  Logs a hard diskette error.  It is called when we get an error that
   * should be reported to the user by more than an errno.
   *
   *  Usually it will occur after all the retries are done, and the error
   * still exists.
   *
   */
  static void 
  fdlog_error(fdp, value)
       register struct floppy *fdp;
       u_char value;
  {
    char *msg;
  
    FDDEBUG(FDSTAT, printf("fdlog_error: entering...\n"));
  
    /* NEEDS WORK -- this should be syslog or whatever the heck
     * NEEDS WORK -- OSF/1 uses.  Took out the errsave() stuff.
     */
  
    /* Differentiate between some hardware and internal errors.
     */
    switch(fdadapter.fd_req.r_return_code) {
    case 0x8000:          /* Device Busy, Operation Fefused */
    case 0x800f:          /* Invalid Value in NVRAM */
    case 0x9009:          /* Controller Failure on Reset */
    case 0x9108:          /* DMA Overrun on Operation */
    case 0x9120:          /* Controller Failure */
    case 0x9140:          /* Seek Operation Failed */
    case 0x9180:          /* General Error */
    case 0xa120:          /* Controller Failure */
    case 0xb020:          /* Controller Failure */
      msg = "hardware error";
      break;
    case 0xc000:          /* Invalid Logical ID */
    case 0xc001:          /* Invalid Function */
    case 0xc003:          /* Invalid Unit Number */
    case 0xc004:          /* Invalid Request Block Length */
    case 0xc005:          /* Invalid Diskette Parameter */
      msg = "internal driver error";
      break;
    default:
      msg = fd_tmp_errors[value];
      break;
    }
    printf("***fd%d: %s (%x)!***\n",fdadapter.fd_req.r_unit, msg,
           fdadapter.fd_req.r_return_code);
  }
  
  /*  Gains access of the diskette adapter for the caller, sleeping if
   * necessary.  This can be called from interrupt level, because FDBUSY
   * is set in this case.
   */
  static void
  fdget_adapter()
  {
    register int pri;
  
    pri = splfd();
  
    while (fdadapter.fdintr_status != FDFREE) {
      FDDEBUG(FDCMD,printf("fdget_adapter: adapter not free!\n"));
  
      fdadapter.need_controller = TRUE;
      sleep(&fdadapter.need_sleep,PRIBIO);        /* NEEDS WORK */
    }
  
    fdadapter.fdintr_status = FDBUSY;
    fdadapter.need_controller = FALSE;
  
    splx(pri);
  }
  
  /* Checks for non-contiguous physical pages.  We can't dma across a virtual
   * page boundry that are not physically contiguous.
   */
  static int
  d_max_page(bp,baddr,paddr,max)
       struct buf *bp;
       u_int baddr;
       u_int *paddr;
       unsigned long max;
  {
    unsigned long count = ((unsigned long) baddr) & (I386_PGBYTES-1);
    unsigned long old_addr;
    unsigned long new_addr;
  
    /* if count is aligned, we can transfer a whole page */
    if (count==0) count = I386_PGBYTES;
  
    if ( (*paddr = pmap_extract(get_pmap(bp),baddr)) == 0)
      return(0);
  
    /*  Now loop through and get the real address of each of the
     ** following pages.  Break on the first non-contiguous page,
     ** or when we exceed count.
     */
    baddr += I386_PGBYTES;
    old_addr = *paddr + I386_PGBYTES;
    while ( (count < max) &&
           ((new_addr = pmap_extract(get_pmap(bp),baddr)) != 0) &&
           (new_addr == old_addr) ) {
      count += I386_PGBYTES;
      baddr += I386_PGBYTES;
      old_addr += I386_PGBYTES;
    }
    return(count > max ? max : count);
  }
  
  struct fd_errors { 
  int     code;
  char    *msg;
  } fd_err_codes [] = {
          {0x00,  "timeout"},
          {0x01,  "bad-command"},
          {0x02,  "address-mark-not-found"},
          {0x04,  "record-not-found"},
          {0x05,  "reset-failed"},
          {0x07,  "activity-failed"},
          {0x0a,  "defective-sector"},
          {0x0b,  "bad-track"},
          {0x0d,  "invalid-sector"},
          {0x0e,  "CAM-detected"},
          {0x0f,  "DMA-arb-level-bad"},
          {0x10,  "bad-ecc-error"},
          {0x11,  "ecc-corrected"},
          {0x20,  "bad-controller"},
          {0x21,  "equipment-check"},
          {0x40,  "bad-seek"},
          {0x80,  "device-didn't-respond"},
          {0xaa,  "drive-not-ready"},
          {0xbb,  "undefined-error"},
          {0xcc,  "write-fault"},
          {0xff,  "incomplete-sense"},
          {0xc000,"invalid LID"},
          {0xc001,"invalid function"},
          {0xc003,"invalid unit number"},
          {0xc004,"invalid request block length"},
          {0xc005,"invalid parameter"}
  
  };
  
  void fd_error_decode(
          int     code,
          char    *msg)
  {
          int i;
          int n = code&0x00ff;
  
          if ((code&0x8000) == 0) {
                  char *p;
                  switch(code)
                  {
                  case 0:
                          p = "completed ok";
                          break;
                  case 1:
                          p = "stage on int";
                          break;
                  case 2:
                          p = "stage on time";
                          break;
                  case 5:
                          p = "not my int";
                          break;
                  default:
                          printf("unknown[0x%x]%s", code, msg);
                          return;
                  }
                  printf("%s%s", p, msg);
                  return;
          }
          if (code&0x4000) {
                  printf("PARAMETER ");
                  n = code;
          }
          if (code&0x2000)
                  printf("TIME-OUT ");
          if (code&0x1000)
                  printf("DEVICE ");
          if (code&0x100)
                  printf("RETRYABLE ");
          printf("ERROR ");
          for (i=0; i<(sizeof fd_err_codes)/(sizeof fd_err_codes[0]); ++i)
                  if (fd_err_codes[i].code == n)
                          {
                          printf("%s%s", fd_err_codes[i].msg, msg);
                          return;
                          }
          printf("unknown[0x%x]%s", code, msg);
  }
  
  
  #ifdef  MACH_KERNEL
  
  
  
  /*
   * NAME: fdgetstat(dev, flavour, data, count) 
   *                                                                    
   * FUNCTION: This function implements one half of the functions implemented
   *           by the IOCTL routine in the MACH 2.5 version of this floppy
   *           driver. 
   *                                                                    
   * EXECUTION ENVIRONMENT:
   *                                                                   
   * RETURNS: 
   */  
  
  
  
  io_return_t fdgetstat(dev, flavor, data, count)
          dev_t           dev;            /* device */
          int             flavor;         /* command */
          int *           data;           /* pointer to OUT array */
          unsigned int    *count;         /* OUT */
  {
  
          register struct floppy *fdp;
          register struct fdparms *fdparmsp;
          io_return_t     errcode = D_SUCCESS;
  
          fdp = &floppies[fd_drive(dev)];
  
          switch(flavor){
  
          case    FDIOCGETPARMS:
  
                          /* Check to see if out buffer is large enough */
          
                  if (*count < sizeof(struct fdparms)/sizeof(int))
                          return(D_INVALID_OPERATION);    
  
                  /* In mach 2.5 space for fdparmsp was allocated here */
                  /* initialized, then a copyout would be done to the */
                  /* user supplied buffer space. and then a copyout   */
                  /* would be done to user space. But here the pointer */
                  /* to data is in kernel space and so it need not be */
                  /* done. */
  
  
                  fdparmsp = (struct fdparms *)data;
  
                  fdparmsp->diskette_type         = fdp->diskette_type;
                  fdparmsp->sector_size           = fdp->e_bytesps;
                  fdparmsp->sectors_per_track     = fdp->sectors_per_track; 
                  fdparmsp->sectors_per_cylinder  = fdp->sectors_per_cylinder;
                  fdparmsp->tracks_per_cylinder   = fdp->tracks_per_cylinder;
                  fdparmsp->cylinders_per_disk    = fdp->cylinders_per_disk;
                  fdparmsp->data_rate             = fdp->data_rate;
                  fdparmsp->head_settle_time      = fdp->head_settle_time;
                  fdparmsp->head_load             = 0;
                  fdparmsp->fill_byte             = fdp->fill_byte;
                  fdparmsp->step_rate             = 0;
                  fdparmsp->step_rate_time        = 0;
                  fdparmsp->gap                   = fdp->gap;
                  fdparmsp->format_gap            = fdp->format_gap;
                  fdparmsp->data_length           = fdp->data_length;
                  fdparmsp->motor_off_time        = fdp->motor_off_time;  
                  fdparmsp->bytes_per_sector      = fdp->bytes_per_sector;
                  fdparmsp->number_of_blocks      = fdp->number_of_blocks;
  
                  /* force the out buffer to be word alligned */
  
                  *count = sizeof(struct fdparms)/sizeof(int);
  
                  errcode = D_SUCCESS;
                  break;
  
          default:
  
                  errcode = D_INVALID_OPERATION;
          
          }  /* End of case flavor statement */
  
          return(errcode);
  
  }
  
  
  
  /*
   * NAME: fdsetstat(dev, flavour, data, count) 
   *                                                                    
   * FUNCTION: This function implements a set of the functions that were
   *           being performed in the IOCT routine of the MACH 2.5 version 
   *           of this floppy driver 
   *                                                                    
   * EXECUTION ENVIRONMENT:
   *                                                                   
   * RETURNS: 
   */  
  
  
  io_return_t fdsetstat(dev, flavor, data, count)
          dev_t           dev;
          int             flavor;
          int *           data;
          unsigned int    count;
  {
  
          register struct floppy *fdp;
          register struct devinfo *devinfop;
          register struct fdinfo *fdinfop;
          register struct fdparms *fdparmsp;
          int     temp;
          io_return_t     errcode = D_SUCCESS;
  
  
          fdp = &floppies[fd_drive(dev)];
  
  #define check(cnd, err)         if (!(cnd)) {           \
                                          errcode = (err);\
                                          break;          \
                                  }
  
  #define cond(member)            (fdp->member == fdparmsp->member)       
  
  
  
          switch(flavor){
          
          case    FDIOCSETPARMS:
  
                  /* define two macros that will be used to screen */
                  /* requests to set protected parameters of the */
                  /* floppy drive that ABIOS doesnt support changes */
                  /* to by the user */
  
  /*
  
  #define check(cnd, err)         if (!(cnd)) {                   \
                                          errcode = (err);        \ 
                                          break;                  \
                                  }
  
  #define cond(member)            (fdp->member == fdparmsp->member)
  
  */
  
                  /* base the the fdparmsp on the user supplied data */
  
                  fdparmsp = (struct fdparms *)data;
                  
                  if (fdparmsp == NULL)
                  {
                          errcode = ENOMEM;
                          break;
                  }
  
                  /* Check to see if ABIOS protected fields are being */
                  /* requested to be changed, if so retuen Error */
  
  
                  check(fdp->diskette_type == fdparmsp->diskette_type,
                          D_INVALID_OPERATION);
                  check(fdparmsp->head_load == 0, D_INVALID_OPERATION);
                  check(fdparmsp->step_rate == 0, D_INVALID_OPERATION);
                  check(fdparmsp->step_rate_time == 0, D_INVALID_OPERATION);
                  check(cond(sectors_per_track), D_INVALID_OPERATION);
                  check(cond(sectors_per_cylinder), D_INVALID_OPERATION);
                  check(cond(tracks_per_cylinder), D_INVALID_OPERATION);
                  check(cond(cylinders_per_disk), D_INVALID_OPERATION);
                  check(cond(data_rate), D_INVALID_OPERATION);
                  check(cond(head_settle_time), D_INVALID_OPERATION);
                  check(cond(number_of_blocks), D_INVALID_OPERATION);
                  check(cond(bytes_per_sector), D_INVALID_OPERATION);
  
                  /* If we are here it means that the request is a legal */
                  /* ABIOS supported request. So we check to see which of */
                  /* the legal parameters are being requested to be changed */
                  /* save the original value, attempt a change, if the ABIOS */
                  /* request fails then we reset the value to the original */
                  /* legal value and return a FAILURE */
  
  
          /* Check to see if bytes_per_sector changed */
  
  
                  if (fdp->e_bytesps != fdparmsp->sector_size)
                  {
  
                          /* 256 and 512 Bytes per sector are legal values */
  
                          check((fdparmsp->sector_size==FD_256_BYTE_PER_SECTOR) ||
                                 (fdparmsp->sector_size==FD_512_BYTE_PER_SECTOR),
                                  D_INVALID_OPERATION);
  
                          temp = fdp->e_bytesps;  /* save original */
  
                          fdp->e_bytesps = fdparmsp->sector_size;
          
                          fdget_adapter();
  
                          if (fdexecute_command(fdp,FD_SETDP_POLL) != FDSUCCESS)
                          {
  
                                  fdp->e_bytesps = temp;
                                  errcode = D_INVALID_OPERATION;
                                  break;
  
                          }
  
                  /* When changing sector_size, bytes_per_sector will be */
                  /* implicitly changed, so update the users view of */
                  /* bytes_per_sector accordingly */
  
                          fdparmsp->bytes_per_sector = fdp->bytes_per_sector;
  
  
                          check(temp == 0, D_INVALID_OPERATION);  /* Magic */
  
                  } 
  
          /* Check to see if gap has changed */
  
                  if (fdp->gap != fdparmsp->gap)
                  {
                          temp = fdp->gap;        /* save original value */
                          fdp->gap = fdparmsp->gap;
                          fdget_adapter();
                          if (fdexecute_command(fdp,FD_SETDP_POLL) != FDSUCCESS)
                          {
                                  fdp->gap = temp;
                                  errcode = D_INVALID_OPERATION;
                                  break;
  
                          }
                  }
  
  
          /* Check to see if data_length has changed */
  
                  
                  if (fdp->data_length != fdparmsp->data_length)
                  {
                          temp = fdp->data_length;        /* save original */
                          fdp->data_length = fdparmsp->data_length;
                          fdget_adapter();
                          if (fdexecute_command(fdp,FD_SETDP_POLL) != FDSUCCESS)
                          {
                                  fdp->data_length = temp;
                                  errcode = D_INVALID_OPERATION;
                                  break;
                          }
                  }
  
          /* Check to see fill_byte has changed */
  
                  
                  if (fdp->fill_byte != fdparmsp->fill_byte)
                  {
                          temp = fdp->fill_byte;          /* save original */
                          fdp->fill_byte = fdparmsp->fill_byte;
                          fdget_adapter();
                          if (fdexecute_command(fdp,FD_SETDP_POLL) != FDSUCCESS)
                          {
                                  fdp->fill_byte = temp;
                                  errcode = D_INVALID_OPERATION;
                                  break;
                          }
                  }
  
  
          /* Check to see if format_gap has changed */
  
                  if (fdp->format_gap != fdparmsp->format_gap)
                  {
                          temp = fdp->format_gap;         /* save original */
                          fdp->format_gap = fdparmsp->format_gap;
                          fdget_adapter();
                          if (fdexecute_command(fdp,FD_SETDP_POLL) != FDSUCCESS)
                          {
                                  fdp->format_gap = temp;
                                  errcode = D_INVALID_OPERATION;
                                  break;
                          }
                  }
  
          /* Check if motor_off_time has changed */
  
                  if (fdp->motor_off_time != fdparmsp->motor_off_time)
                  {
                          fdadapter.mot_wd.time = fdparmsp->motor_off_time;
                          fdp->motor_off_time = fdparmsp->motor_off_time;
                          break;
                  }
  
  
          case FDIOCFORMAT:
  
          default:
  
                  errcode = D_INVALID_OPERATION;
                  break;
                          
  
          } /* End of switch statement for flavor */
  
  
          return(errcode);
  }
  
  /*
   * NAME: fdabios_init 
   *                                                                    
   * FUNCTION: This function initializes the floppy driver data structures
   *           by calling ABIOS to querry for the parameters of the floppy
   *           drive and controller in the system. 
   *                                                                    
   * EXECUTION ENVIRONMENT:
   *                                                                   
   * This is called by fdinit() at system initialization time.                     *                                             
   * RETURNS: NONE
   */  
  
  fdabios_init(fdp)
  register struct floppy *fdp;
  {
  
          register struct Fd_request *fdreq;              
          u_char  drive_number;
          int rc = FDSUCCESS;
  
          fdadapter.fdintr_status = FDBUSY; 
  
          fdp->timeout_flag = FALSE;
  #ifdef  MACH_KERNEL
          /* called at probe; timeouts not set (or available) */
  #else
          UNTIMEOUT(fdadapter.mot_wd);
  #endif  /* MACH_KERNEL */
  
          fdreq = &fdadapter.fd_req;
          drive_number = fd_drive(fdp->device_number);
          fdadapter.fd_flag = 0;
          fdreq->state = FD_RB_IDLE;      /* may not be needed */
          fdreq->sleep_on_intr = 0;      /* may not be needed */
  
          FD_SET_RESERVED_ABIOS_LOGICAL_PARAMETER(fdreq);
  
          fdreq->r_current_req_blck_len = sizeof(struct Fd_request);
          fdreq->r_logical_id = abios_next_LID(FD_ID, 2);
          fdreq->r_unit = 0;
          fdreq->request_header.Request_Block_Flags = 0;
          fdreq->request_header.ELA_Offset = 0;
          fd_no_retry(fdp);
  
  
          fdp->timeout_flag = FALSE;
          fdreq->state |= FD_RB_SYNC;
          fdreq->req_errno = 0;
  
  
          fdreq->r_function = FDABIOS_INIT;
          fdreq->r_return_code = ABIOS_UNDEFINED;
          fdreq->state |= FD_RB_STARTED;
  
          abios_common_start(fdreq, fdadapter.fd_flag);
  
          /* wait for ABIOS to get done */
  
          while (fdreq->r_return_code == ABIOS_UNDEFINED)
          {
                  assert_wait(0, FALSE);
                  thread_set_timeout(10);
                  thread_block((continuation_t) 0);
          }
  
          /* Look for synchronous errors from ABIOS */
  
          if (fdreq->r_return_code & 0x8000)
          {
                  if (fdreq->r_return_code == 0xc000)
                     printf("Req 1: Invalid Logical ID\n\n");
                  if (fdreq->r_return_code == 0xc001)
                     printf("Req 1: Invalid Function\n\n");
                  if (fdreq->r_return_code == 0xc003)
                     printf("Req 1: Invalid Unit Number\n\n");
                  if (fdreq->r_return_code == 0xc004)
                     printf("Req 1: Invalid Request Block Length\n\n");
                  else
                     printf("Req 1: Unkown Error\n\n");
  
                  return(EIO);
          }
  
          while (fdreq->r_return_code != ABIOS_DONE)
          {
                  assert_wait(0, FALSE);
                  thread_set_timeout(10);
                  thread_block((continuation_t) 0);
          }
  
          rc = fdreq->req_errno;
  
          if (rc != FDSUCCESS)
                  return(rc);
  
          fdreq->r_current_req_blck_len = fdreq->r_request_block_length;
          fdadapter.fd_flag = fdreq->r_logical_id_flags;
          fdadapter.fd_intl = fdreq->r_hardware_intr;
          fdadapter.fd_numd = fdreq->r_number_units;
  
  
          if (fdadapter.fd_numd == 0)
  #ifdef  MACH_KERNEL
                  return D_NO_SUCH_DEVICE;
  #else   /* MACH_KERNEL */
                  return(ENODEV);
  #endif  /* MACH_KERNEL */
  
          if (fdadapter.fd_numd > FDMAXDRIVES)
                  fdadapter.fd_numd = FDMAXDRIVES;
  
  
          FD_SET_RESERVED_ABIOS_READ_PARAMETER(fdreq);
  
          fd_no_retry(fdp);
          
          fdp->timeout_flag = FALSE;
          fdreq->state |= FD_RB_SYNC;
          fdreq->req_errno = 0;
  
          fdreq->r_function = ABIOS_READ_PARAMETER;
          fdreq->r_return_code = ABIOS_UNDEFINED;
          fdreq->state |= FD_RB_STARTED;
  
  
          abios_common_start(fdreq, fdadapter.fd_flag);
  
          /* wait for ABIOS to get done */
  
          while(fdreq->r_return_code == ABIOS_UNDEFINED)
          {
                  assert_wait(0, FALSE);
                  thread_set_timeout(10);
                  thread_block((continuation_t) 0);
          }
  
  
          /* Look for synchronous errors from ABIOS */
  
          if (fdreq->r_return_code & 0x8000)
          {
  
                  if (fdreq->r_return_code == 0x8000)
                     printf("Req 2: Device Busy Error\n\n");
                  if (fdreq->r_return_code == 0x8001)
                     printf("Req 2: Diskette Not Started\n\n");
                  if (fdreq->r_return_code == 0xc000)
                     printf("Req 2: Invalid Logical ID\n\n");
                  if (fdreq->r_return_code == 0xc001)
                     printf("Req 2: Invalid Function\n\n");
                  if (fdreq->r_return_code == 0xc003)
                     printf("Req 2: Invalid Unit Number\n\n");
                  if (fdreq->r_return_code == 0xc004)
                     printf("Req 2: Invalid Request Block Length\n\n");
                  else
                     printf("Req 2: Sync Error reported by ABIOS \n\n");
  
                  return(EIO);
          }
  
          while (fdreq->r_return_code != ABIOS_DONE)
          {
                  assert_wait(0, FALSE);
                  thread_set_timeout(10);
                  thread_block((continuation_t)0);
          }
  
  
          rc = fdreq->req_errno;
  
          if (rc != FDSUCCESS)
                  return(rc);
  
          fdadapter.motor_off_delay = fd_motor_off_delay_time(fdreq);
  
          fdadapter.fdintr_status = FDFREE;
  
          return(rc);
  
  }
  
  #endif  /* MACH_KERNEL */