FreeBSD/Linux Kernel Cross Reference
sys/dev/qbus/qd.c

     /*      $NetBSD: qd.c,v 1.44 2008/06/12 23:06:14 cegger Exp $   */
     
     /*-
      * Copyright (c) 1988 Regents of the University of California.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)qd.c        7.1 (Berkeley) 6/28/91
     */
    
    /************************************************************************
    *                                                                       *
    *                       Copyright (c) 1985-1988 by                      *
    *               Digital Equipment Corporation, Maynard, MA              *
    *                       All rights reserved.                            *
    *                                                                       *
    *   This software is furnished under a license and may be used and      *
    *   copied  only  in accordance with the terms of such license and      *
    *   with the  inclusion  of  the  above  copyright  notice.   This      *
    *   software  or  any  other copies thereof may not be provided or      *
    *   otherwise made available to any other person.  No title to and      *
    *   ownership of the software is hereby transferred.                    *
    *                                                                       *
    *   The information in this software is subject to change  without      *
    *   notice  and should not be construed as a commitment by Digital      *
    *   Equipment Corporation.                                              *
    *                                                                       *
    *   Digital assumes no responsibility for the use  or  reliability      *
    *   of its software on equipment which is not supplied by Digital.      *
    *                                                                       *
    *************************************************************************/
    
    /*
     * qd.c - QDSS display driver for VAXSTATION-II GPX workstation
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: qd.c,v 1.44 2008/06/12 23:06:14 cegger Exp $");
    
    #include "opt_ddb.h"
    
    #include "qd.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/conf.h>
    #include <sys/tty.h>
    #include <sys/kernel.h>
    #include <sys/device.h>
    #include <sys/poll.h>
    #include <sys/buf.h>
    
    #include <uvm/uvm_extern.h>
    
    #include <dev/cons.h>
    
    #include <sys/bus.h>
    #include <machine/scb.h>
    
    #ifdef __vax__
    #include <machine/sid.h>
    #include <sys/cpu.h>
    #include <machine/pte.h>
    #endif
    
    #include <dev/qbus/ubavar.h>
    
    #include <dev/qbus/qduser.h>
    #include <dev/qbus/qdreg.h>
    #include <dev/qbus/qdioctl.h>
    
    #include "ioconf.h"
    
    /*
     * QDSS driver status flags for tracking operational state
     */
   struct qdflags {
           u_int inuse;            /* which minor dev's are in use now */
           u_int config;           /* I/O page register content */
           u_int mapped;           /* user mapping status word */
           u_int kernel_loop;      /* if kernel console is redirected */
           u_int user_dma;         /* DMA from user space in progress */
           u_short pntr_id;        /* type code of pointing device */
           u_short duart_imask;    /* shadowing for duart intrpt mask reg */
           u_short adder_ie;       /* shadowing for adder intrpt enbl reg */
           u_short curs_acc;       /* cursor acceleration factor */
           u_short curs_thr;       /* cursor acceleration threshold level */
           u_short tab_res;        /* tablet resolution factor */
           u_short selmask;        /* mask for active qd select entries */
   };
   
   /*
    * Softc struct to keep track of all states in this driver.
    */
   struct  qd_softc {
           struct  device sc_dev;
           bus_space_tag_t sc_iot;
           bus_space_handle_t sc_ioh;
           bus_dma_tag_t   sc_dmat;
   };
   
   /*
    * bit definitions for 'inuse' entry
    */
   #define CONS_DEV        0x01
   #define GRAPHIC_DEV     0x04
   
   /*
    * bit definitions for 'mapped' member of flag structure
    */
   #define MAPDEV          0x01            /* hardware is mapped */
   #define MAPDMA          0x02            /* DMA buffer mapped */
   #define MAPEQ           0x04            /* event queue buffer mapped */
   #define MAPSCR          0x08            /* scroll param area mapped */
   #define MAPCOLOR        0x10            /* color map writing buffer mapped */
   
   /*
    * constants used in shared memory operations
    */
   #define EVENT_BUFSIZE  1024     /* # of bytes per device's event buffer */
   #define MAXEVENTS  ( (EVENT_BUFSIZE - sizeof(struct qdinput))    \
           / sizeof(struct _vs_event) )
   #define DMA_BUFSIZ      (1024 * 10)
   #define COLOR_BUFSIZ  ((sizeof(struct color_buf) + 512) & ~0x01FF)
   
   /*
    * reference to an array of "uba_device" structures built by the auto
    * configuration program.  The uba_device structure decribes the device
    * sufficiently for the driver to talk to it.  The auto configuration code
    * fills in the uba_device structures (located in ioconf.c) from user
    * maintained info.
    */
   struct uba_device *qdinfo[NQD];  /* array of pntrs to each QDSS's */
   struct tty *qd_tty[NQD*4];      /* teletype structures for each.. */
   volatile char *qvmem[NQD];
   volatile struct pte *QVmap[NQD];
   #define CHUNK     (64 * 1024)
   #define QMEMSIZE  (1024 * 1024 * 4)     /* 4 meg */
   
   /*
    * static storage used by multiple functions in this code
    */
   int Qbus_unmap[NQD];            /* Qbus mapper release code */
   struct qdmap qdmap[NQD];        /* QDSS register map structure */
   struct qdflags qdflags[NQD];    /* QDSS register map structure */
   void *qdbase[NQD];              /* base address of each QDSS unit */
   struct buf qdbuf[NQD];          /* buf structs used by strategy */
   short qdopened[NQD];            /* graphics device is open exclusive use */
   
   /*
    * the array "event_shared[]" is made up of a number of event queue buffers
    * equal to the number of QDSS's configured into the running kernel (NQD).
    * Each event queue buffer begins with an event queue header (struct qdinput)
    * followed by a group of event queue entries (struct _vs_event).  The array
    * "*eq_header[]" is an array of pointers to the start of each event queue
    * buffer in "event_shared[]".
    */
   #define EQSIZE ((EVENT_BUFSIZE * NQD) + 512)
   
   char event_shared[EQSIZE];          /* reserve space for event bufs */
   struct qdinput *eq_header[NQD];     /* event queue header pntrs */
   
   /*
    * This allocation method reserves enough memory pages for NQD shared DMA I/O
    * buffers.  Each buffer must consume an integral number of memory pages to
    * guarantee that a following buffer will begin on a page boundary.  Also,
    * enough space is allocated so that the FIRST I/O buffer can start at the
    * 1st page boundary after "&DMA_shared".  Page boundaries are used so that
    * memory protections can be turned on/off for individual buffers.
    */
   #define IOBUFSIZE  ((DMA_BUFSIZ * NQD) + 512)
   
   char DMA_shared[IOBUFSIZE];         /* reserve I/O buffer space */
   struct DMAreq_header *DMAheader[NQD];  /* DMA buffer header pntrs */
   
   /*
    * The driver assists a client in scroll operations by loading dragon
    * registers from an interrupt service routine. The loading is done using
    * parameters found in memory shrade between the driver and it's client.
    * The scroll parameter structures are ALL loacted in the same memory page
    * for reasons of memory economy.
    */
   char scroll_shared[2 * 512];    /* reserve space for scroll structs */
   struct scroll *scroll[NQD];     /* pointers to scroll structures */
   
   /*
    * the driver is programmable to provide the user with color map write
    * services at VSYNC interrupt time.  At interrupt time the driver loads
    * the color map with any user-requested load data found in shared memory
    */
   #define COLOR_SHARED  ((COLOR_BUFSIZ * NQD) + 512)
   
   char color_shared[COLOR_SHARED];      /* reserve space: color bufs */
   struct color_buf *color_buf[NQD];     /* pointers to color bufs */
   
   /*
    * mouse input event structures
    */
   struct mouse_report last_rep[NQD];
   struct mouse_report current_rep[NQD];
   
   struct selinfo qdrsel[NQD];     /* process waiting for select */
   struct _vs_cursor cursor[NQD];  /* console cursor */
   int qdcount = 0;                /* count of successfully probed qd's */
   int nNQD = NQD;
   int DMAbuf_size = DMA_BUFSIZ;
   int QDlast_DMAtype;             /* type of the last DMA operation */
   
   /*
    * macro to get system time.  Used to time stamp event queue entries
    */
   #define TOY ((time.tv_sec * 100) + (time.tv_usec / 10000))
   
   void qd_attach(device_t, device_t, void *);
   static int qd_match(device_t, cfdata_t, void *);
   
   static void qddint(void *);     /* DMA gate array intrpt service */
   static void qdaint(void *);     /* Dragon ADDER intrpt service */
   static void qdiint(void *);
   
   #define QDPRIOR (PZERO-1)               /* must be negative */
   #define FALSE   0
   #ifdef TRUE
   #undef TRUE
   #endif
   #define TRUE    ~FALSE
   #define BAD     -1
   #define GOOD    0
   
   /*
    * macro to create a system virtual page number from system virtual adrs
    */
   #define VTOP(x)  (((int)x & ~0xC0000000) >> VAX_PGSHIFT)
   
   /*
    * QDSS register address offsets from start of QDSS address space
    */
   #define QDSIZE   (52 * 1024)    /* size of entire QDSS foot print */
   #define TMPSIZE  (16 * 1024)    /* template RAM is 8k SHORT WORDS */
   #define TMPSTART 0x8000         /* offset of template RAM from base adrs */
   #define REGSIZE  (5 * 512)      /* regs touch 2.5k (5 pages) of addr space */
   #define REGSTART 0xC000         /* offset of reg pages from base adrs */
   #define ADDER   (REGSTART+0x000)
   #define DGA     (REGSTART+0x200)
   #define DUART   (REGSTART+0x400)
   #define MEMCSR  (REGSTART+0x800)
   #define CLRSIZE  (3 * 512)              /* color map size */
   #define CLRSTART (REGSTART+0xA00)       /* color map start offset from base */
   /*  0x0C00 really */
   #define RED     (CLRSTART+0x000)
   #define BLUE    (CLRSTART+0x200)
   #define GREEN   (CLRSTART+0x400)
   
   
   /*
    * QDSS minor device numbers.  The *real* minor device numbers are in
    * the bottom two bits of the major/minor device spec.  Bits 2 and up are
    * used to specify the QDSS device number (ie: which one?)
    */
   
   #define CONS            0
   #define GRAPHIC         2
   
   /*
    * console cursor bitmap (white block cursor)
    */
   short cons_cursor[32] = {
           /* A */ 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF,
           0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF,
           /* B */ 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF,
           0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF, 0x00FF
   };
   
   /*
    * constants used in font operations
    */
   #define CHARS           190                     /* # of chars in the font */
   #define CHAR_HEIGHT     15                      /* char height in pixels */
   #define CHAR_WIDTH      8                       /* char width in pixels*/
   #define FONT_WIDTH      (CHAR_WIDTH * CHARS)    /* font width in pixels */
   #define ROWS            CHAR_HEIGHT
   #define FONT_X          0                       /* font's off screen adrs */
   #define FONT_Y          (2048 - CHAR_HEIGHT)
   
   /* Offset to second row characters (XXX - should remove) */
   #define FONT_OFFSET     ((MAX_SCREEN_X/CHAR_WIDTH)*CHAR_HEIGHT)
   
   extern char q_font[];           /* reference font object code */
   extern  u_short q_key[];        /* reference key xlation tables */
   extern  u_short q_shift_key[];
   extern  char *q_special[];
   
   /*
    * definitions for cursor acceleration reporting
    */
   #define ACC_OFF         0x01            /* acceleration is inactive */
   
   /*
    * virtual console support.
    */
   extern struct cdevsw *consops;
   cons_decl(qd);
   void setup_dragon(int);
   void init_shared(int);
   void clear_qd_screen(int);
   void ldfont(int);
   void ldcursor(int, short *);
   void setup_input(int);
   void blitc(int, u_char);
   void scroll_up(volatile struct adder *);
   void write_ID(volatile struct adder *, short, short);
   int wait_status(volatile struct adder *, int);
   void led_control(int, int, int);
   void qdstart(struct tty *);
   void qdearly(void);
   int qdpolling = 0;
   
   dev_type_open(qdopen);
   dev_type_close(qdclose);
   dev_type_read(qdread);
   dev_type_write(qdwrite);
   dev_type_ioctl(qdioctl);
   dev_type_stop(qdstop);
   dev_type_poll(qdpoll);
   dev_type_kqfilter(qdkqfilter);
   
   const struct cdevsw qd_cdevsw = {
           qdopen, qdclose, qdread, qdwrite, qdioctl,
           qdstop, notty, qdpoll, nommap, qdkqfilter,
   };
   
   /*
    * LK-201 state storage for input console keyboard conversion to ASCII
    */
   struct q_keyboard {
           int shift;                      /* state variables      */
           int cntrl;
           int lock;
           int lastcode;                   /* last keycode typed   */
           unsigned kup[8];                /* bits for each keycode*/
           unsigned dkeys[8];              /* down/up mode keys    */
           char last;                      /* last character       */
   } q_keyboard;
   
   /*
    * tty settings on first open
    */
   #define IFLAG (BRKINT|ISTRIP|IXON|IXANY|ICRNL|IMAXBEL)
   #define OFLAG (OPOST|OXTABS|ONLCR)
   #define LFLAG (ISIG|ICANON|ECHO|IEXTEN)
   #define CFLAG (PARENB|CREAD|CS7|CLOCAL)
   
   /*
    * Kernel virtual addresses where we can map in the QBUS io page and the
    * QDSS memory during qdcninit.  pmap_bootstrap fills this in.
    */
   void *qd_ubaio;
   
   /* This is the QDSS unit 0 CSR.  It is hard-coded in here so that the
    * QDSS can be used as the console.  The console routines don't get
    * any config info.  The ROM also autodetects at this address, so
    * the console QDSS should be at this address.  Furthermore, nothing
    * else shuld be at this address instead because that would confuse the
    * ROM and this driver.
    */
   #define QDSSCSR 0x1F00
   
   volatile u_short *qdaddr;       /* Virtual address for QDSS CSR */
   
   /*
    * This flag is set to 1 if the console initialization (qdcninit)
    * has been performed on qd0.  That initialization is required and must
    * be done before the device probe routine.
    */
   int qd0cninited = 0, qd0iscons = 0;
   
   /*
    * Do early check if the qdss is console. If not; don't allocate
    * any memory for it in bootstrap.
    */
   void
   qdearly()
   {
           extern vaddr_t virtual_avail;
           int tmp;
   
           /* Make sure we're running on a system that can have a QDSS */
           if (vax_boardtype == VAX_BTYP_630)  {
                   /* Now check some undocumented flag */
                   if ((*(int *)(0x200B801E) & 0x60) == 0)
                           /* The KA630 isn't using a QDSS as the console,
                            * so we won't either */
                           return;
           } else if (vax_boardtype != VAX_BTYP_650)
                   return;
   
           /* How to check for console on KA650? We assume that if there is a
            * QDSS, it is console.
            */
   #define QIOPAGE 0x20000000      /* XXX */
   #define UBAIOPAGES 16
           tmp = QIOPAGE + ubdevreg(QDSSCSR);
           if (badaddr((void *)tmp, sizeof(short)))
                   return;
   
           MAPVIRT(qvmem[0], 64 * 1024 * NQD / VAX_NBPG);
           MAPVIRT(qd_ubaio, 16);
           pmap_map((int)qd_ubaio, QIOPAGE, QIOPAGE + UBAIOPAGES * VAX_NBPG,
               VM_PROT_READ|VM_PROT_WRITE);
           qdaddr = (u_short *)((u_int)qd_ubaio + ubdevreg(QDSSCSR));
           qd0iscons = 1;
   }
   
   void
   qdcnprobe(cndev)
           struct  consdev *cndev;
   {
           int i;
   
           cndev->cn_pri = CN_DEAD;
   
           if (mfpr(PR_MAPEN) == 0)
                   return; /* Cannot use qd if vm system is OFF */
   
           if (!qd0iscons)
                   return;
   
           /* Find the console device corresponding to the console QDSS */
           cndev->cn_dev = makedev(cdevsw_lookup_major(&qd_cdevsw), 0);
           cndev->cn_pri = CN_INTERNAL;
           return;
   }
   
   
   /*
    * Init QDSS as console (before probe routine)
    */
   void
   qdcninit(cndev)
           struct  consdev *cndev;
   {
           void *phys_adr;         /* physical QDSS base adrs */
           u_int mapix;                    /* index into QVmap[] array */
           int unit;
   
           /* qdaddr must point to CSR for this unit! */
   
           /* The console QDSS is QDSS unit 0 */
           unit = 0;
   
           /*
            * Map q-bus memory used by qdss. (separate map)
            */
           mapix = QMEMSIZE - (CHUNK * (unit + 1));
   #define QMEM 0x30000000
           (int)phys_adr = QMEM + mapix;
           pmap_map((int)(qvmem[0]), (int)phys_adr, (int)(phys_adr + (CHUNK*NQD)),
                                       VM_PROT_READ|VM_PROT_WRITE);
   
           /*
            * Set QVmap to point to page table entries for what we just
            * mapped.
            */
           QVmap[0] = (struct pte *)kvtopte(qvmem[0]);
   
           /*
            * tell QDSS which Q memory address base to decode
            * (shifted right 16 bits - its in 64K units)
            */
           *qdaddr = (u_short)((int)mapix >> 16);
           qdflags[unit].config = *(u_short *)qdaddr;
   
           /*
            * load qdmap struct with the virtual addresses of the QDSS elements
            */
           qdbase[unit] = (void *) (qvmem[0]);
           qdmap[unit].template = qdbase[unit] + TMPSTART;
           qdmap[unit].adder = qdbase[unit] + ADDER;
           qdmap[unit].dga = qdbase[unit] + DGA;
           qdmap[unit].duart = qdbase[unit] + DUART;
           qdmap[unit].memcsr = qdbase[unit] + MEMCSR;
           qdmap[unit].red = qdbase[unit] + RED;
           qdmap[unit].blue = qdbase[unit] + BLUE;
           qdmap[unit].green = qdbase[unit] + GREEN;
   
           qdflags[unit].duart_imask = 0;  /* init shadow variables */
   
           /*
            * init the QDSS
            */
   
           *(short *)qdmap[unit].memcsr |= SYNC_ON; /* once only: turn on sync */
   
           cursor[unit].x = 0;
           cursor[unit].y = 0;
           init_shared(unit);              /* init shared memory */
           setup_dragon(unit);             /* init the ADDER/VIPER stuff */
           clear_qd_screen(unit);          /* clear the screen */
           ldfont(unit);                   /* load the console font */
           ldcursor(unit, cons_cursor);    /* load default cursor map */
           setup_input(unit);              /* init the DUART */
           selinit(&qdrsel[unit]);
   
           /* Set flag so probe knows */
           qd0cninited = 1;
   } /* qdcninit */
   
   /* see <sys/device.h> */
   CFATTACH_DECL(qd, sizeof(struct qd_softc),
       qd_match, qd_attach, NULL, NULL);
   
   #define QD_RCSR(reg) \
           bus_space_read_2(sc->sc_iot, sc->sc_ioh, reg)
   #define QD_WCSR(reg, val) \
           bus_space_write_2(sc->sc_iot, sc->sc_ioh, reg, val)
   
   /*
    *  Configure QDSS into Q memory and make it intrpt.
    *
    *  side effects: QDSS gets mapped into Qbus memory space at the first
    *               vacant 64kb boundary counting back from the top of
    *               Qbus memory space (qvmem+4mb)
    *
    *  return: QDSS bus request level and vector address returned in
    *         registers by UNIX convention.
    *
    */
   static int
   qd_match(parent, match, aux)
           device_t parent;
           cfdata_t match;
           void *aux;
   {
           struct qd_softc ssc;
           struct qd_softc *sc = &ssc;
           struct uba_attach_args *ua = aux;
           struct uba_softc *uh = (void *)parent;
           int unit;
           volatile struct dga *dga;       /* pointer to gate array structure */
           int vector;
   #ifdef notdef
           int *ptep;                      /* page table entry pointer */
           void *phys_adr;         /* physical QDSS base adrs */
           u_int mapix;
   #endif
   
           /* Create a "fake" softc with only a few fields used. */
           sc->sc_iot = ua->ua_iot;
           sc->sc_ioh = ua->ua_ioh;
           sc->sc_dmat = ua->ua_dmat;
           /*
            * calculate board unit number from I/O page register address
            */
           unit = (int) (((int)sc->sc_ioh >> 1) & 0x0007);
   
           /*
            * QDSS regs must be mapped to Qbus memory space at a 64kb
            * physical boundary.  The Qbus memory space is mapped into
            * the system memory space at config time.  After config
            * runs, "qvmem[0]" (ubavar.h) holds the system virtual adrs
            * of the start of Qbus memory.   The Qbus memory page table
            * is found via an array of pte ptrs called "QVmap[]" (ubavar.h)
            * which is also loaded at config time.   These are the
            * variables used below to find a vacant 64kb boundary in
            * Qbus memory, and load it's corresponding physical adrs
            * into the QDSS's I/O page CSR.
            */
   
           /*
            * Only if QD is the graphics device.
            */
   
           /* if this QDSS is NOT the console, then do init here.. */
   
           if (unit != 0) {
                   printf("qd: can't support two qdss's (yet)\n");
   #ifdef notdef   /* can't test */
                   if (v_consputc != qdputc  ||  unit != 0) {
   
                           /*
                           * read QDSS config info
                           */
                           qdflags[unit].config = *(u_short *)reg;
   
                           /*
                           * find an empty 64kb adrs boundary
                           */
   
                           qdbase[unit] = (void *) (qvmem[0] + QMEMSIZE - CHUNK);
   
                           /*
                           * find the cpusw entry that matches this machine.
                           */
                           cpup = &cpusw[cpu];
                           while (!(BADADDR(qdbase[unit], sizeof(short))))
                                   qdbase[unit] -= CHUNK;
   
                           /*
                           * tell QDSS which Q memory address base to decode
                           */
                           mapix = (int) (VTOP(qdbase[unit]) - VTOP(qvmem[0]));
                           ptep = (int *) QVmap[0] + mapix;
                           phys_adr = (void *)(((int)*ptep&0x001FFFFF)<<VAX_PGSHIFT);
                           *(u_short *)reg = (u_short) ((int)phys_adr >> 16);
   
                           /*
                           * load QDSS adrs map with system addresses
                           * of device regs
                           */
                           qdmap[unit].template = qdbase[unit] + TMPSTART;
                           qdmap[unit].adder = qdbase[unit] + ADDER;
                           qdmap[unit].dga = qdbase[unit] + DGA;
                           qdmap[unit].duart = qdbase[unit] + DUART;
                           qdmap[unit].memcsr = qdbase[unit] + MEMCSR;
                           qdmap[unit].red = qdbase[unit] + RED;
                           qdmap[unit].blue = qdbase[unit] + BLUE;
                           qdmap[unit].green = qdbase[unit] + GREEN;
   
                           /* device init */
   
                           cursor[unit].x = 0;
                           cursor[unit].y = 0;
                           init_shared(unit);              /* init shared memory */
                           setup_dragon(unit);     /* init the ADDER/VIPER stuff */
                           ldcursor(unit, cons_cursor);    /* load default cursor map */
                           setup_input(unit);              /* init the DUART */
                           clear_qd_screen(unit);
                           ldfont(unit);                   /* load the console font */
   
                           /* once only: turn on sync */
   
                           *(short *)qdmap[unit].memcsr |= SYNC_ON;
                   }
   #endif /*notdef*/
           } else {
                   /* We are dealing with qd0 */
   
                   if (!qd0cninited) {
                           /*
                            * qd0 has not been initiallized as the console.
                            * We need to do some initialization now
                            *
                            * XXX
                            * However, if the QDSS is not the console then
                            * that stupid undocumented bit (see qdcnprobe)
                            * is cleared.  Then the QDSS refuses to work.
                            * (What did the ROM do to it!?)
                            * XXX
                            */
                            return 0;
   
   #if 0
                            qdaddr = (void *)reg;
   
                            /* Lame probe for QDSS.  Should be ok for qd0 */
                            if (badaddr((void *)qdaddr, sizeof(short)))
                                    return 0;
   
                            qdcninit(NULL);
   #endif
                   }
           }
   
   
           /*
           * The QDSS interrupts at HEX vectors xx0 (DMA) xx4
           * (ADDER) and xx8 (DUART).  Therefore, we take three
           * vectors from the vector pool, and then continue
           * to take them until we get a xx0 HEX vector.  The
           * pool provides vectors in contiguous decending
           * order.
           */
   
           vector = (uh->uh_lastiv -= 4*3);        /* take three vectors */
   
           while (vector & 0x0F) {            /* if lo nibble != 0.. */
                   /* ..take another vector */
                   vector = (uh->uh_lastiv -= 4);
           }
   
           /*
           * setup DGA to do a DMA interrupt (transfer count = 0)
           */
           dga = (struct dga *) qdmap[unit].dga;
           dga->csr = (short) HALT;        /* disable everything */
           dga->ivr = (short) vector;      /* load intrpt base vector */
           dga->bytcnt_lo = (short) 0;     /* DMA xfer count = 0 */
           dga->bytcnt_hi = (short) 0;
   
           /*
           * turn on DMA interrupts
           */
           dga->csr &= ~SET_DONE_FIFO;
           dga->csr |= DMA_IE | DL_ENB;
   
           DELAY(20000);                   /* wait for the intrpt */
           dga->csr = HALT;                /* stop the wheels */
   
           /*
           * score this as an existing qdss
           */
           qdcount++;
   
           return 1;
   } /* qdprobe */
   
   
   void qd_attach(parent, self, aux)
              device_t parent, *self;
              void *aux;
   {
           struct uba_attach_args *ua = aux;
           int unit;       /* QDSS module # for this call */
   
           printf("\n");
   
           unit = device_unit(self);               /* get QDSS number */
   
           /* Set interrupt vectors for interrupt handlers */
   
           uba_intr_establish(ua->ua_icookie, ua->ua_cvec    , qddint, self);
           uba_intr_establish(ua->ua_icookie, ua->ua_cvec + 4, qdaint, self);
           uba_intr_establish(ua->ua_icookie, ua->ua_cvec + 8, qdiint, self);
   
           /*
           * init "qdflags[]" for this QDSS
           */
           qdflags[unit].inuse = 0;        /* init inuse variable EARLY! */
           qdflags[unit].mapped = 0;
           qdflags[unit].kernel_loop = -1;
           qdflags[unit].user_dma = 0;
           qdflags[unit].curs_acc = ACC_OFF;
           qdflags[unit].curs_thr = 128;
           qdflags[unit].tab_res = 2;      /* default tablet resolution factor */
           qdflags[unit].duart_imask = 0;  /* init shadow variables */
           qdflags[unit].adder_ie = 0;
   
           /*
           * init structures used in kbd/mouse interrupt service.  This code must
           * come after the "init_shared()" routine has run since that routine
           * inits the eq_header[unit] structure used here.
           */
   
           /*
           * init the "latest mouse report" structure
           */
           last_rep[unit].state = 0;
           last_rep[unit].dx = 0;
           last_rep[unit].dy = 0;
           last_rep[unit].bytcnt = 0;
   
           /*
           * init the event queue (except mouse position)
           */
           eq_header[unit]->header.events =
               (struct _vs_event *)((int)eq_header[unit] + sizeof(struct qdinput));
   
           eq_header[unit]->header.size = MAXEVENTS;
           eq_header[unit]->header.head = 0;
           eq_header[unit]->header.tail = 0;
   
           /*
            * open exclusive for graphics device.
            */
           qdopened[unit] = 0;
   
   } /* qdattach */
   
   
   /*ARGSUSED*/
   int
   qdopen(dev_t dev, int flag, int mode, struct proc *p)
   {
           volatile struct dga *dga;       /* ptr to gate array struct */
           struct tty *tp;
           volatile struct duart *duart;
           struct uba_softc *sc;
           int unit;
           int minor_dev;
   
           minor_dev = minor(dev); /* get QDSS minor device number */
           unit = minor_dev >> 2;
   
           /*
           * check for illegal conditions
           */
           sc = device_lookup_private(&qd_cd, unit);
           if (sc == NULL)
                   return ENXIO;
   
           duart = (struct duart *) qdmap[unit].duart;
           dga = (struct dga *) qdmap[unit].dga;
   
           if ((minor_dev & 0x03) == 2) {
                   /*
                   * this is the graphic device...
                   */
                   if (qdopened[unit] != 0)
                           return(EBUSY);
                   else
                           qdopened[unit] = 1;
                   qdflags[unit].inuse |= GRAPHIC_DEV;  /* graphics dev is open */
                   /*
                    * enble kbd & mouse intrpts in DUART mask reg
                    */
                   qdflags[unit].duart_imask |= 0x22;
                   duart->imask = qdflags[unit].duart_imask;
           } else {
                   /* Only one console */
                   if (minor_dev) return ENXIO;
   
                   /* If not done already, allocate tty structure */
                   if (qd_tty[minor_dev] == NULL)
                           qd_tty[minor_dev] = ttymalloc();
   
                   if (qd_tty[minor_dev] == NULL)
                           return ENXIO;
   
                   /*
                   * this is the console
                   */
                   qdflags[unit].inuse |= CONS_DEV;  /* mark console as open */
                   dga->csr |= CURS_ENB;
                   qdflags[unit].duart_imask |= 0x02;
                   duart->imask = qdflags[unit].duart_imask;
                   /*
                   * some setup for tty handling
                   */
                   tp = qd_tty[minor_dev];
                   /* tp->t_addr = ui->ui_addr; */
                   tp->t_oproc = qdstart;
                   tp->t_dev = dev;
                   if ((tp->t_state & TS_ISOPEN) == 0) {
                           ttychars(tp);
                           tp->t_ispeed = B9600;
                           tp->t_ospeed = B9600;
                           tp->t_state = TS_ISOPEN | TS_CARR_ON;
                           tp->t_iflag = TTYDEF_IFLAG;
                           tp->t_oflag = TTYDEF_OFLAG;
                           tp->t_lflag = TTYDEF_LFLAG;
                           tp->t_cflag = TTYDEF_CFLAG;
                           ttsetwater(tp);
                   }
                   /*
                   * enable intrpts, open line discipline
                   */
                   dga->csr |= GLOBAL_IE;  /* turn on the interrupts */
                   return ((*tp->t_linesw->l_open)(dev, tp));
           }
           dga->csr |= GLOBAL_IE;  /* turn on the interrupts */
           return(0);
   
   } /* qdopen */
   
   /*ARGSUSED*/
   int
   qdclose(dev_t dev, int flag, int mode, struct proc *p)
   {
           struct tty *tp;
           struct qdmap *qd;
           volatile int *ptep;
           volatile struct dga *dga;       /* gate array register map pointer */
           volatile struct duart *duart;
           volatile struct adder *adder;
           int unit;
           int minor_dev;
           u_int mapix;
           int i;                          /* SIGNED index */
           struct uba_softc *uh;
   
           minor_dev = minor(dev);         /* get minor device number */
           unit = minor_dev >> 2;          /* get QDSS number */
           qd = &qdmap[unit];
   
           uh = device_private(device_parent(device_lookup(&qd_cd, unit)));
   
   
           if ((minor_dev & 0x03) == 2) {
                   /*
                   * this is the graphic device...
                   */
                   if (qdopened[unit] != 1)
                           return(EBUSY);
                   else
                           qdopened[unit] = 0;     /* allow it to be re-opened */
                   /*
                   * re-protect device memory
                   */
                   if (qdflags[unit].mapped & MAPDEV) {
                           /*
                           * TEMPLATE RAM
                           */
                           mapix = VTOP((int)qd->template) - VTOP(qvmem[0]);
                           ptep = (int *)(QVmap[0] + mapix);
                           for (i = 0; i < vax_btop(TMPSIZE); i++, ptep++)
                                   *ptep = (*ptep & ~PG_PROT) | PG_V | PG_KW;
                           /*
                           * ADDER
                           */
                           mapix = VTOP((int)qd->adder) - VTOP(qvmem[0]);
                           ptep = (int *)(QVmap[0] + mapix);
                           for (i = 0; i < vax_btop(REGSIZE); i++, ptep++)
                                   *ptep = (*ptep & ~PG_PROT) | PG_V | PG_KW;
                           /*
                           * COLOR MAPS
                           */
                           mapix = VTOP((int)qd->red) - VTOP(qvmem[0]);
                           ptep = (int *)(QVmap[0] + mapix);
                           for (i = 0; i < vax_btop(CLRSIZE); i++, ptep++)
                                   *ptep = (*ptep & ~PG_PROT) | PG_V | PG_KW;
                   }
   
                   /*
                   * re-protect DMA buffer and free the map registers
                   */
                   if (qdflags[unit].mapped & MAPDMA) {
                           panic("Unmapping unmapped buffer");
   #ifdef notyet
   /*
    * Ragge 990620:
    * Can't happen because the buffer can't be mapped.
    */
                           dga = (struct dga *) qdmap[unit].dga;
                           adder = (struct adder *) qdmap[unit].adder;
                           dga->csr &= ~DMA_IE;
                           dga->csr &= ~0x0600;    /* kill DMA */
                           adder->command = CANCEL;
                           /*
                            * if DMA was running, flush spurious intrpt
                            */
                           if (dga->bytcnt_lo != 0) {
                                   dga->bytcnt_lo = 0;
                                   dga->bytcnt_hi = 0;
                                   DMA_SETIGNORE(DMAheader[unit]);
                                   dga->csr |= DMA_IE;
                                   dga->csr &= ~DMA_IE;
                           }
                           ptep = (int *)
                              ((VTOP(DMAheader[unit]*4)) + (mfpr(PR_SBR)|0x80000000));
                           for (i = 0; i < vax_btop(DMAbuf_size); i++, ptep++)
                                   *ptep = (*ptep & ~PG_PROT) | PG_V | PG_KW;
                           ubarelse(uh, &Qbus_unmap[unit]);
   #endif
                   }
   
                   /*
                   * re-protect 1K (2 pages) event queue
                   */
                   if (qdflags[unit].mapped & MAPEQ) {
                           ptep = (int *)
                              ((VTOP(eq_header[unit])*4) + (mfpr(PR_SBR)|0x80000000));
                           *ptep = (*ptep & ~PG_PROT) | PG_KW | PG_V; ptep++;
                           *ptep = (*ptep & ~PG_PROT) | PG_KW | PG_V;
                   }
                   /*
                   * re-protect scroll param area and disable scroll intrpts
                   */
                   if (qdflags[unit].mapped & MAPSCR) {
                           ptep = (int *) ((VTOP(scroll[unit]) * 4)
                                   + (mfpr(PR_SBR) | 0x80000000));
                           /*
                            * re-protect 512 scroll param area
                            */
                           *ptep = (*ptep & ~PG_PROT) | PG_KW | PG_V;
                           adder = (struct adder *) qdmap[unit].adder;
                           qdflags[unit].adder_ie &= ~FRAME_SYNC;
                           adder->interrupt_enable = qdflags[unit].adder_ie;
                   }
                   /*
                   * re-protect color map write buffer area and kill intrpts
                   */
                   if (qdflags[unit].mapped & MAPCOLOR) {
                           ptep = (int *) ((VTOP(color_buf[unit]) * 4)
                                   + (mfpr(PR_SBR) | 0x80000000));
                           *ptep = (*ptep & ~PG_PROT) | PG_KW | PG_V; ptep++;
                           *ptep = (*ptep & ~PG_PROT) | PG_KW | PG_V;
                          color_buf[unit]->status = 0;
                          adder = (struct adder *) qdmap[unit].adder;
                          qdflags[unit].adder_ie &= ~VSYNC;
                          adder->interrupt_enable = qdflags[unit].adder_ie;
                  }
                  mtpr(0, PR_TBIA);
                  /* flag everything now unmapped */
                  qdflags[unit].mapped = 0;
                  qdflags[unit].inuse &= ~GRAPHIC_DEV;
                  qdflags[unit].curs_acc = ACC_OFF;
                  qdflags[unit].curs_thr = 128;
                  /*
                  * restore the console
                  */
                  dga = (struct dga *) qdmap[unit].dga;
                  adder = (struct adder *) qdmap[unit].adder;
                  dga->csr &= ~DMA_IE;
                  dga->csr &= ~0x0600;    /* halt the DMA! (just in case...) */
                  dga->csr |= DMA_ERR;    /* clear error condition */
                  adder->command = CANCEL;
                  /*
                   * if DMA was running, flush spurious intrpt
                   */
                  if (dga->bytcnt_lo != 0) {
                          dga->bytcnt_lo = 0;
                          dga->bytcnt_hi = 0;
                          DMA_SETIGNORE(DMAheader[unit]);
                          dga->csr |= DMA_IE;
                          dga->csr &= ~DMA_IE;
                  }
                  init_shared(unit);              /* init shared memory */
                  setup_dragon(unit);             /* init ADDER/VIPER */
                  ldcursor(unit, cons_cursor);    /* load default cursor map */
                  setup_input(unit);              /* init the DUART */
                  ldfont(unit);
                  cursor[unit].x = 0;
                  cursor[unit].y = 0;
                  /*
                   * shut off the mouse rcv intrpt and turn on kbd intrpts
                   */
                  duart = (struct duart *) qdmap[unit].duart;
                  qdflags[unit].duart_imask &= ~(0x20);
                  qdflags[unit].duart_imask |= 0x02;
                  duart->imask = qdflags[unit].duart_imask;
                  /*
                  * shut off interrupts if all is closed
                  */
                  if (!(qdflags[unit].inuse & CONS_DEV)) {
                          dga = (struct dga *) qdmap[unit].dga;
                          dga->csr &= ~(GLOBAL_IE | DMA_IE);
                  }
          } else {
                  /*
                  * this is the console
                  */
                  tp = qd_tty[minor_dev];
                  (*tp->t_linesw->l_close)(tp, flag);
                  ttyclose(tp);
                  tp->t_state = 0;
                  qdflags[unit].inuse &= ~CONS_DEV;
                  /*
                  * if graphics device is closed, kill interrupts
                  */
                  if (!(qdflags[unit].inuse & GRAPHIC_DEV)) {
                          dga = (struct dga *) qdmap[unit].dga;
                          dga->csr &= ~(GLOBAL_IE | DMA_IE);
                  }
          }
  
          return(0);
  
  } /* qdclose */
  
  int
  qdioctl(dev, cmd, datap, flags, p)
          dev_t dev;
          u_long cmd;
          void *datap;
          int flags;
          struct proc *p;
  {
          volatile int *ptep;     /* page table entry pointer */
          int mapix;              /* QVmap[] page table index */
          struct _vs_event *event;
          struct tty *tp;
          int i;
          struct qdmap *qd;               /* pointer to device map struct */
          volatile struct dga *dga;       /* Gate Array reg structure pntr */
          volatile struct duart *duart;   /* DUART reg structure pointer */
          volatile struct adder *adder;   /* ADDER reg structure pointer */
          struct prgkbd *cmdbuf;
          struct prg_cursor *curs;
          struct _vs_cursor *pos;
          int unit = minor(dev) >> 2;     /* number of caller's QDSS */
          u_int minor_dev = minor(dev);
          int error;
          int s;
          short *temp;                    /* a pointer to template RAM */
          struct uba_softc *uh;
  
          uh = device_private(device_parent(device_lookup(&qd_cd, unit)));
  
          /*
          * service graphic device ioctl commands
          */
          switch (cmd) {
  
          case QD_GETEVENT:
                  /*
                  * extract the oldest event from the event queue
                  */
                  if (ISEMPTY(eq_header[unit])) {
                          event = (struct _vs_event *) datap;
                          event->vse_device = VSE_NULL;
                          break;
                  }
                  event = (struct _vs_event *) GETBEGIN(eq_header[unit]);
                  s = spl5();
                  GETEND(eq_header[unit]);
                  splx(s);
                  bcopy((void *)event, datap, sizeof(struct _vs_event));
                  break;
  
          case QD_RESET:
                  /*
                  * init the dragon stuff, DUART, and driver variables
                  */
                  init_shared(unit);              /* init shared memory */
                  setup_dragon(unit);             /* init the ADDER/VIPER stuff */
                  clear_qd_screen(unit);
                  ldcursor(unit, cons_cursor);    /* load default cursor map */
                  ldfont(unit);                   /* load the console font */
                  setup_input(unit);              /* init the DUART */
                  break;
  
          case QD_SET:
                  /*
                  * init the DUART and driver variables
                  */
                  init_shared(unit);
                  setup_input(unit);
                  break;
  
          case QD_CLRSCRN:
                  /*
                  * clear the QDSS screen.  (NOTE that this reinits the dragon)
                  */
  #ifdef notdef   /* has caused problems and isn't necessary */
                  setup_dragon(unit);
                  clear_qd_screen(unit);
  #endif
                  break;
  
          case QD_WTCURSOR:
                  /*
                  * load a cursor into template RAM
                  */
                  ldcursor(unit, (short *)datap);
                  break;
  
          case QD_RDCURSOR:
  
                  temp = (short *) qdmap[unit].template;
                  /*
                   * cursor is 32 WORDS from the end of the 8k WORD...
                   *  ...template space
                   */
                  temp += (8 * 1024) - 32;
                  for (i = 0; i < 32; ++i, datap += sizeof(short))
                          *(short *)datap = *temp++;
                  break;
  
          case QD_POSCURSOR:
                  /*
                  * position the mouse cursor
                  */
                  dga = (struct dga *) qdmap[unit].dga;
                  pos = (struct _vs_cursor *) datap;
                  s = spl5();
                  dga->x_cursor = TRANX(pos->x);
                  dga->y_cursor = TRANY(pos->y);
                  eq_header[unit]->curs_pos.x = pos->x;
                  eq_header[unit]->curs_pos.y = pos->y;
                  splx(s);
                  break;
  
          case QD_PRGCURSOR:
                  /*
                  * set the cursor acceleration factor
                  */
                  curs = (struct prg_cursor *) datap;
                  s = spl5();
                  qdflags[unit].curs_acc = curs->acc_factor;
                  qdflags[unit].curs_thr = curs->threshold;
                  splx(s);
                  break;
  
          case QD_MAPDEVICE:
                  /*
                  * enable 'user write' to device pages
                  */
                  qdflags[unit].mapped |= MAPDEV;
                  qd = (struct qdmap *) &qdmap[unit];
                  /*
                  * enable user write to template RAM
                  */
                  mapix = VTOP((int)qd->template) - VTOP(qvmem[0]);
                  ptep = (int *)(QVmap[0] + mapix);
                  for (i = 0; i < vax_btop(TMPSIZE); i++, ptep++)
                          *ptep = (*ptep & ~PG_PROT) | PG_RW | PG_V;
  
                  /*
                  * enable user write to registers
                  */
                  mapix = VTOP((int)qd->adder) - VTOP(qvmem[0]);
                  ptep = (int *)(QVmap[0] + mapix);
                  for (i = 0; i < vax_btop(REGSIZE); i++, ptep++)
                          *ptep = (*ptep & ~PG_PROT) | PG_RW | PG_V;
  
                  /*
                  * enable user write to color maps
                  */
                  mapix = VTOP((int)qd->red) - VTOP(qvmem[0]);
                  ptep = (int *)(QVmap[0] + mapix);
                  for (i = 0; i < vax_btop(CLRSIZE); i++, ptep++)
                          *ptep = (*ptep & ~PG_PROT) | PG_RW | PG_V;
  
                  /*
                  * enable user write to DUART
                  */
                  mapix = VTOP((int)qd->duart) - VTOP(qvmem[0]);
                  ptep = (int *)(QVmap[0] + mapix);
                  *ptep = (*ptep & ~PG_PROT) | PG_RW | PG_V; /* duart page */
  
                  mtpr(0, PR_TBIA);               /* invalidate translation buffer */
  
                  /*
                   * stuff qdmap structure in return buffer
                   */
                  bcopy((void *)qd, datap, sizeof(struct qdmap));
  
                  break;
  
  #ifdef notyet
  /*
   * Ragge 999620:
   * Can't map in the graphic buffer into user space for now.
   * The best way to fix this is to convert this driver to wscons.
   */
          case QD_MAPIOBUF:
                  /*
                   * do setup for DMA by user process
                   *
                   * set 'user write enable' bits for DMA buffer
                   */
                  qdflags[unit].mapped |= MAPDMA;
                  ptep = (int *) ((VTOP(DMAheader[unit]) * 4)
                          + (mfpr(PR_SBR) | 0x80000000));
                  for (i = 0; i < vax_btop(DMAbuf_size); i++, ptep++)
                          *ptep = (*ptep & ~PG_PROT) | PG_RW | PG_V;
                  mtpr(0, PR_TBIA);       /* invalidate translation buffer */
                  /*
                  * set up QBUS map registers for DMA
                  */
                  DMAheader[unit]->QBAreg =
                      uballoc(uh, (void *)DMAheader[unit], DMAbuf_size, 0);
                  if (DMAheader[unit]->QBAreg == 0)
                      printf("qd%d: qdioctl: QBA setup error\n", unit);
                  Qbus_unmap[unit] = DMAheader[unit]->QBAreg;
                  DMAheader[unit]->QBAreg &= 0x3FFFF;
                  /*
                  * return I/O buf adr
                  */
                  *(int *)datap = (int) DMAheader[unit];
                  break;
  #endif
  
          case QD_MAPSCROLL:
                  /*
                  * map the shared scroll param area and enable scroll interpts
                  */
                  qdflags[unit].mapped |= MAPSCR;
                  ptep = (int *) ((VTOP(scroll[unit]) * 4)
                          + (mfpr(PR_SBR) | 0x80000000));
                  /*
                   * allow user write to scroll area
                   */
                  *ptep = (*ptep & ~PG_PROT) | PG_RW | PG_V;
                  mtpr(0, PR_TBIA);                       /* invalidate translation buf */
                  scroll[unit]->status = 0;
                  adder = (struct adder *) qdmap[unit].adder;
                  qdflags[unit].adder_ie |= FRAME_SYNC;
                  adder->interrupt_enable = qdflags[unit].adder_ie;
                  *(int *)datap = (int) scroll[unit]; /* return scroll area */
                  break;
  
          case QD_UNMAPSCROLL:
                  /*
                  * unmap shared scroll param area and disable scroll intrpts
                  */
                  if (qdflags[unit].mapped & MAPSCR) {
                          qdflags[unit].mapped &= ~MAPSCR;
                          ptep = (int *) ((VTOP(scroll[unit]) * 4)
                                  + (mfpr(PR_SBR) | 0x80000000));
                          /*
                           * re-protect 512 scroll param area
                           */
                          *ptep = (*ptep & ~PG_PROT) | PG_KW | PG_V;
                          mtpr(0, PR_TBIA);       /* smash CPU's translation buf */
                          adder = (struct adder *) qdmap[unit].adder;
                          qdflags[unit].adder_ie &= ~FRAME_SYNC;
                          adder->interrupt_enable = qdflags[unit].adder_ie;
                  }
                  break;
  
          case QD_MAPCOLOR:
                  /*
                  * map shared color map write buf and turn on vsync intrpt
                  */
                  qdflags[unit].mapped |= MAPCOLOR;
                  ptep = (int *) ((VTOP(color_buf[unit]) * 4)
                          + (mfpr(PR_SBR) | 0x80000000));
                  /*
                   * allow user write to color map write buffer
                   */
                  *ptep = (*ptep & ~PG_PROT) | PG_RW | PG_V; ptep++;
                  *ptep = (*ptep & ~PG_PROT) | PG_RW | PG_V;
                  mtpr(0, PR_TBIA);                       /* clr CPU translation buf */
                  adder = (struct adder *) qdmap[unit].adder;
                  qdflags[unit].adder_ie |= VSYNC;
                  adder->interrupt_enable = qdflags[unit].adder_ie;
                  /*
                   * return color area address
                   */
                  *(int *)datap = (int) color_buf[unit];
                  break;
  
          case QD_UNMAPCOLOR:
                  /*
                   * unmap shared color map write buffer and kill VSYNC intrpts
                   */
                  if (qdflags[unit].mapped & MAPCOLOR) {
                          qdflags[unit].mapped &= ~MAPCOLOR;
                          ptep = (int *) ((VTOP(color_buf[unit]) * 4)
                                  + (mfpr(PR_SBR) | 0x80000000));
                          /*
                           * re-protect color map write buffer
                           */
                          *ptep = (*ptep & ~PG_PROT) | PG_KW | PG_V; ptep++;
                          *ptep = (*ptep & ~PG_PROT) | PG_KW | PG_V;
                          mtpr(0, PR_TBIA);
                          adder = (struct adder *) qdmap[unit].adder;
                          qdflags[unit].adder_ie &= ~VSYNC;
                          adder->interrupt_enable = qdflags[unit].adder_ie;
                  }
                  break;
  
          case QD_MAPEVENT:
                  /*
                  * give user write access to the event queue
                  */
                  qdflags[unit].mapped |= MAPEQ;
                  ptep = (int *) ((VTOP(eq_header[unit]) * 4)
                          + (mfpr(PR_SBR) | 0x80000000));
                  /*
                   * allow user write to 1K event queue
                   */
                  *ptep = (*ptep & ~PG_PROT) | PG_RW | PG_V; ptep++;
                  *ptep = (*ptep & ~PG_PROT) | PG_RW | PG_V;
                  mtpr(0, PR_TBIA);                       /* clr CPU translation buf */
                  /*
                   * return event queue address
                   */
                  *(int *)datap = (int)eq_header[unit];
                  break;
  
          case QD_PRGKBD:
                  /*
                  * pass caller's programming commands to LK201
                  */
                  duart = (struct duart *)qdmap[unit].duart;
                  cmdbuf = (struct prgkbd *)datap;    /* pnt to kbd cmd buf */
                  /*
                  * send command
                  */
                  for (i = 1000; i > 0; --i) {
                          if (duart->statusA&XMT_RDY) {
                                  duart->dataA = cmdbuf->cmd;
                                  break;
                          }
                  }
                  if (i == 0) {
                          printf("qd%d: qdioctl: timeout on XMT_RDY [1]\n", unit);
                          break;
                  }
                  /*
                  * send param1?
                  */
                  if (cmdbuf->cmd & LAST_PARAM)
                          break;
                  for (i = 1000; i > 0; --i) {
                          if (duart->statusA&XMT_RDY) {
                                  duart->dataA = cmdbuf->param1;
                                  break;
                          }
                  }
                  if (i == 0) {
                          printf("qd%d: qdioctl: timeout on XMT_RDY [2]\n", unit);
                          break;
                  }
                  /*
                  * send param2?
                  */
                  if (cmdbuf->param1 & LAST_PARAM)
                      break;
                  for (i = 1000; i > 0; --i) {
                          if (duart->statusA&XMT_RDY) {
                                  duart->dataA = cmdbuf->param2;
                                  break;
                          }
                  }
                  if (i == 0) {
                          printf("qd%d: qdioctl: timeout on XMT_RDY [3]\n", unit);
                          break;
                  }
                  break;
  
          case QD_PRGMOUSE:
                  /*
                  * pass caller's programming commands to the mouse
                  */
                  duart = (struct duart *) qdmap[unit].duart;
                  for (i = 1000; i > 0; --i) {
                          if (duart->statusB&XMT_RDY) {
                                  duart->dataB = *datap;
                                  break;
                          }
                  }
                  if (i == 0) {
                          printf("qd%d: qdioctl: timeout on XMT_RDY [4]\n", unit);
                  }
                  break;
  
          case QD_RDCONFIG:
                  /*
                  * get QDSS configuration word and return it
                  */
                  *(short *)datap = qdflags[unit].config;
                  break;
  
          case QD_KERN_LOOP:
          case QD_KERN_UNLOOP:
                  /*
                   * vestige from ultrix.  BSD uses TIOCCONS to redirect
                   * kernel console output.
                   */
                  break;
  
          case QD_PRGTABLET:
                  /*
                  * program the tablet
                  */
                  duart = (struct duart *) qdmap[unit].duart;
                  for (i = 1000; i > 0; --i) {
                          if (duart->statusB&XMT_RDY) {
                                  duart->dataB = *datap;
                                  break;
                          }
                  }
                  if (i == 0) {
                          printf("qd%d: qdioctl: timeout on XMT_RDY [5]\n", unit);
                  }
                  break;
  
          case QD_PRGTABRES:
                  /*
                  * program the tablet report resolution factor
                  */
                  qdflags[unit].tab_res = *(short *)datap;
                  break;
  
          default:
                  /*
                  * service tty ioctl's
                  */
                  if (!(minor_dev & 0x02)) {
                          tp = qd_tty[minor_dev];
                          error =
  
                     (*tp->t_linesw->l_ioctl)(tp, cmd, datap, flags, p);
                          if (error != EPASSTHROUGH) {
                                  return(error);
                          }
                          return ttioctl(tp, cmd, datap, flags, p);
                  }
                  break;
          }
  
          return(0);
  
  } /* qdioctl */
  
  
  int
  qdpoll(dev, events, p)
          dev_t dev;
          int events;
          struct proc *p;
  {
          int s;
          int unit;
          struct tty *tp;
          u_int minor_dev = minor(dev);
          int revents = 0;
  
          s = spl5();
          unit = minor_dev >> 2;
  
          if ((minor_dev & 0x03) == 2)  {
                  /*
                   * This is a graphics device, so check for events.
                   */
  
                  if (events & (POLLIN | POLLRDNORM))
                          if(!(ISEMPTY(eq_header[unit])))
                                  revents |= events & (POLLIN | POLLRDNORM);
  
                  if (events & (POLLOUT | POLLWRNORM))
                          if (DMA_ISEMPTY(DMAheader[unit]))
                                  revents |= events & (POLLOUT | POLLWRNORM);
  
                  if (revents == 0)  {
                          if (events & (POLLIN | POLLRDNORM))
                                  selrecord(p, &qdrsel[unit]);
  
                          if (events & (POLLOUT | POLLWRNORM))
                                  selrecord(p, &qdrsel[unit]);
                  }
          } else  {
                  /*
                  * this is a tty device
                  */
                  tp = qd_tty[minor_dev];
                  revents = (*tp->t_linesw->l_poll)(tp, events, p);
          }
  
          splx(s);
          return (revents);
  } /* qdpoll() */
  
  static void
  filt_qdrdetach(struct knote *kn)
  {
          dev_t dev = (intptr_t) kn->kn_hook;
          u_int minor_dev = minor(dev);
          int unit = minor_dev >> 2;
          int s;
  
          s = spl5();
          SLIST_REMOVE(&qdrsel[unit].sel_klist, kn, knote, kn_selnext);
          splx(s);
  }
  
  static int
  filt_qdread(struct knote *kn, long hint)
  {
          dev_t dev = (intptr_t) kn->kn_hook;
          u_int minor_dev = minor(dev);
          int unit = minor_dev >> 2;
  
          if (ISEMPTY(eq_header[unit]))
                  return (0);
  
          kn->kn_data = 0;        /* XXXLUKEM (thorpej): what to put here? */
          return (1);
  }
  
  static int
  filt_qdwrite(struct knote *kn, long hint)
  {
          dev_t dev = (intptr_t) kn->kn_hook;
          u_int minor_dev = minor(dev);
          int unit = minor_dev >> 2;
  
          if (! DMA_ISEMPTY(DMAheader[unit]))
                  return (0);
  
          kn->kn_data = 0;        /* XXXLUKEM (thorpej): what to put here? */
          return (1);
  }
  
  static const struct filterops qdread_filtops =
          { 1, NULL, filt_qdrdetach, filt_qdread };
  
  static const struct filterops qdwrite_filtops =
          { 1, NULL, filt_qdrdetach, filt_qdwrite };
  
  int
  qdkqfilter(dev_t dev, struct knote *kn)
  {
          struct klist *klist;
          u_int minor_dev = minor(dev);
          int s, unit = minor_dev >> 2;
  
          if ((minor_dev & 0x03) != 2) {
                  /* TTY device. */
                  return (ttykqfilter(dev, kn));
          }
  
          switch (kn->kn_filter) {
          case EVFILT_READ:
                  klist = &qdrsel[unit].sel_klist;
                  kn->kn_fop = &qdread_filtops;
                  break;
  
          case EVFILT_WRITE:
                  klist = &qdrsel[unit].sel_klist;
                  kn->kn_fop = &qdwrite_filtops;
                  break;
  
          default:
                  return (EINVAL);
          }
  
          kn->kn_hook = (void *)(intptr_t) dev;
  
          s = spl5();
          SLIST_INSERT_HEAD(klist, kn, kn_selnext);
          splx(s);
  
          return (0);
  }
  
  void qd_strategy(struct buf *bp);
  
  /*ARGSUSED*/
  int
  qdwrite(dev, uio, flag)
          dev_t dev;
          struct uio *uio;
          int flag;
  {
          struct tty *tp;
          int minor_dev;
          int unit;
  
          minor_dev = minor(dev);
          unit = (minor_dev >> 2) & 0x07;
  
          if (((minor_dev&0x03) != 0x02) && (qdflags[unit].inuse&CONS_DEV)) {
                  /*
                  * this is the console...
                  */
                  tp = qd_tty[minor_dev];
                  return ((*tp->t_linesw->l_write)(tp, uio, flag));
          } else if (qdflags[unit].inuse & GRAPHIC_DEV) {
                  /*
                  * this is a DMA xfer from user space
                  */
                  return (physio(qd_strategy, &qdbuf[unit],
                  dev, B_WRITE, minphys, uio));
          }
          return (ENXIO);
  }
  
  /*ARGSUSED*/
  int
  qdread(dev, uio, flag)
          dev_t dev;
          struct uio *uio;
          int flag;
  {
          struct tty *tp;
          int minor_dev;
          int unit;
  
          minor_dev = minor(dev);
          unit = (minor_dev >> 2) & 0x07;
  
          if ((minor_dev & 0x03) != 0x02 && qdflags[unit].inuse & CONS_DEV) {
                  /*
                  * this is the console
                  */
                  tp = qd_tty[minor_dev];
                  return ((*tp->t_linesw->l_read)(tp, uio, flag));
          } else if (qdflags[unit].inuse & GRAPHIC_DEV) {
                  /*
                  * this is a bitmap-to-processor xfer
                  */
                  return (physio(qd_strategy, &qdbuf[unit],
                  dev, B_READ, minphys, uio));
          }
          return (ENXIO);
  }
  
  /***************************************************************
  *
  *       qd_strategy()... strategy routine to do DMA
  *
  ***************************************************************/
  
  void
  qd_strategy(bp)
          struct buf *bp;
  {
          volatile struct dga *dga;
          volatile struct adder *adder;
          int unit;
          int QBAreg;
          int s;
          int cookie;
          struct uba_softc *uh;
  
          unit = (minor(bp->b_dev) >> 2) & 0x07;
  
          uh = device_private(device_parent(device_lookup(&qd_cd, unit)));
  
          /*
          * init pointers
          */
          dga = (struct dga *) qdmap[unit].dga;
  panic("qd_strategy");
  #ifdef notyet
          if ((QBAreg = ubasetup(uh, bp, 0)) == 0) {
                  printf("qd%d: qd_strategy: QBA setup error\n", unit);
                  goto STRAT_ERR;
          }
  #endif
          s = spl5();
          qdflags[unit].user_dma = -1;
          dga->csr |= DMA_IE;
          cookie = QBAreg & 0x3FFFF;
          dga->adrs_lo = (short) cookie;
          dga->adrs_hi = (short) (cookie >> 16);
          dga->bytcnt_lo = (short) bp->b_bcount;
          dga->bytcnt_hi = (short) (bp->b_bcount >> 16);
  
          while (qdflags[unit].user_dma) {
                  (void) tsleep(&qdflags[unit].user_dma, QSPRIOR,
                      "qdstrat", 0);
          }
          splx(s);
  #ifdef notyet
          ubarelse(uh, &QBAreg);
  #endif
          if (!(dga->csr & DMA_ERR)) {
                  biodone(bp);
                  return;
          }
  
  /* STRAT_ERR: */
          adder = (struct adder *) qdmap[unit].adder;
          adder->command = CANCEL;        /* cancel adder activity */
          dga->csr &= ~DMA_IE;
          dga->csr &= ~0x0600;            /* halt DMA (reset fifo) */
          dga->csr |= DMA_ERR;            /* clear error condition */
          bp->b_error = EIO;              /* flag an error to physio() */
  
          /*
           * if DMA was running, flush spurious intrpt
           */
          if (dga->bytcnt_lo != 0) {
                  dga->bytcnt_lo = 0;
                  dga->bytcnt_hi = 0;
                  DMA_SETIGNORE(DMAheader[unit]);
                  dga->csr |= DMA_IE;
          }
          biodone(bp);
  } /* qd_strategy */
  
  
  /*
   *  Start output to the console screen
   */
  void qdstart(tp)
          struct tty *tp;
  {
          int which_unit, unit, c;
          int s;
  
          unit = minor(tp->t_dev);
          which_unit = (unit >> 2) & 0x3;
          unit &= 0x03;
  
          s = spl5();
  
          /*
          * If it's currently active, or delaying, no need to do anything.
          */
          if (tp->t_state & (TS_TIMEOUT|TS_BUSY|TS_TTSTOP))
                  goto out;
  
          /*
          * Display chars until the queue is empty.
          * Drop input from anything but the console
          * device on the floor.
          *
          * XXX - this loop is done at spltty.
          *
          */
          while (tp->t_outq.c_cc) {
                  c = getc(&tp->t_outq);
                  if (unit == 0)
                          blitc(which_unit, (u_char)c);
          }
          ttypull(tp);
          tp->t_state &= ~TS_BUSY;
  
  out:
          splx(s);
  
  } /* qdstart */
  
  /*ARGSUSED*/
  void
  qdstop(tp, flag)
          struct tty *tp;
          int flag;
  {
          int s;
  
          s = spl5();     /* block intrpts during state modification */
          if (tp->t_state & TS_BUSY) {
                  if ((tp->t_state & TS_TTSTOP) == 0)
                          tp->t_state |= TS_FLUSH;
                  else
                          tp->t_state &= ~TS_BUSY;
          }
          splx(s);
  }
  
  /*
   *  Output a character to the QDSS screen
   */
  void
  blitc(unit, chr)
          int unit;
          u_char chr;
  {
          volatile struct adder *adder;
          volatile struct dga *dga;
          int i;
          int nograph = !(qdflags[unit].inuse&GRAPHIC_DEV);
          static short inescape[NQD];
  
          adder = (struct adder *)qdmap[unit].adder;
          dga = (struct dga *) qdmap[unit].dga;
          /*
           * BSD comment: this (&=0177) defeats the extended character
           * set code for the glass tty, but if i had the time i would
           * spend it ripping out the code completely.  This driver
           * is too big for its own good.
           */
          chr &= 0177;
          /*
           * Cursor addressing (so vi will work).
           * Decode for "\E=%.%." cursor motion description.
           * Corresponds to type "qdcons" in /etc/termcap:
           *
           *    qd|qdss|qdcons|qdss glass tty (4.4 BSD):\
           *      :am:do=^J:le=^H:bs:cm=\E=%.%.:cl=1^Z:co#128:li#57::nd=^L:up=^K:
           *
           */
          if (inescape[unit] && nograph) {
                  switch (inescape[unit]++) {
                  case 1:
                          if (chr != '=') {
                                  /* abort escape sequence */
                                  inescape[unit] = 0;
                                  blitc(unit, chr);
                          }
                          return;
                  case 2:
                          /* position row */
                          cursor[unit].y = CHAR_HEIGHT * chr;
                          if (cursor[unit].y > 863 - CHAR_HEIGHT)
                                  cursor[unit].y = 863 - CHAR_HEIGHT;
                          dga->y_cursor = TRANY(cursor[unit].y);
                          return;
                  case 3:
                          /* position column */
                          cursor[unit].x = CHAR_WIDTH * chr;
                          if (cursor[unit].x > 1024 - CHAR_WIDTH)
                                  cursor[unit].x = 1023 - CHAR_WIDTH;
                          dga->x_cursor = TRANX(cursor[unit].x);
                          inescape[unit] = 0;
                          return;
                  default:
                          inescape[unit] = 0;
                          blitc(unit, chr);
                  }
          }
  
          switch (chr) {
          case '\r':                      /* return char */
                  cursor[unit].x = 0;
                  if (nograph)
                          dga->x_cursor = TRANX(cursor[unit].x);
                  return;
  
          case '\t':                      /* tab char */
                  for (i = 8 - ((cursor[unit].x >> 3) & 0x07); i > 0; --i) {
                          blitc(unit, ' ');
                  }
                  return;
  
          case '\n':                      /* line feed char */
                  if ((cursor[unit].y += CHAR_HEIGHT) > (863 - CHAR_HEIGHT)) {
                          if (nograph) {
                                  cursor[unit].y -= CHAR_HEIGHT;
                                  scroll_up(adder);
                          } else
                                  cursor[unit].y = 0;
                  }
                  if (nograph)
                          dga->y_cursor = TRANY(cursor[unit].y);
                  return;
  
          case '\b':                      /* backspace char */
                  if (cursor[unit].x > 0) {
                          cursor[unit].x -= CHAR_WIDTH;
                          if (nograph)
                                  dga->x_cursor = TRANX(cursor[unit].x);
                  }
                  return;
          case CTRL('k'):         /* cursor up */
                  if (nograph && cursor[unit].y > 0) {
                          cursor[unit].y -= CHAR_HEIGHT;
                          dga->y_cursor = TRANY(cursor[unit].y);
                  }
                  return;
  
          case CTRL('^'):         /* home cursor */
                  if (nograph) {
                          cursor[unit].x = 0;
                          dga->x_cursor = TRANX(cursor[unit].x);
                          cursor[unit].y = 0;
                          dga->y_cursor = TRANY(cursor[unit].y);
                  }
                  return;
  
          case CTRL('l'):         /* cursor right */
                  if (nograph && cursor[unit].x < 1023 - CHAR_WIDTH) {
                          cursor[unit].x += CHAR_WIDTH;
                          dga->x_cursor = TRANX(cursor[unit].x);
                  }
                  return;
  
          case CTRL('z'):         /* clear screen */
                  if (nograph) {
                          setup_dragon(unit);
                          clear_qd_screen(unit);
                          /* home cursor - termcap seems to assume this */
                          cursor[unit].x = 0;
                          dga->x_cursor = TRANX(cursor[unit].x);
                          cursor[unit].y = 0;
                          dga->y_cursor = TRANY(cursor[unit].y);
                  }
                  return;
  
          case '\033':            /* start escape sequence */
                  if (nograph)
                          inescape[unit] = 1;
                  return;
  
          default:
                  if ((chr < ' ') || (chr > '~'))
                          return;
          }
          /*
           * setup VIPER operand control registers
           */
          write_ID(adder, CS_UPDATE_MASK, 0x0001);  /* select plane #0 */
          write_ID(adder, SRC1_OCR_B,
          EXT_NONE | INT_SOURCE | ID | BAR_SHIFT_DELAY);
          write_ID(adder, CS_UPDATE_MASK, 0x00FE);  /* select other planes */
          write_ID(adder, SRC1_OCR_B,
          EXT_SOURCE | INT_NONE | NO_ID | BAR_SHIFT_DELAY);
          write_ID(adder, CS_UPDATE_MASK, 0x00FF);  /* select all planes */
          write_ID(adder, DST_OCR_B,
          EXT_NONE | INT_NONE | NO_ID | NO_BAR_SHIFT_DELAY);
          write_ID(adder, MASK_1, 0xFFFF);
          write_ID(adder, VIPER_Z_LOAD | FOREGROUND_COLOR_Z, 1);
          write_ID(adder, VIPER_Z_LOAD | BACKGROUND_COLOR_Z, 0);
          adder->x_clip_min = 0;
          adder->x_clip_max = 1024;
          adder->y_clip_min = 0;
          adder->y_clip_max = 864;
          /*
           * load DESTINATION origin and vectors
           */
          adder->fast_dest_dy = 0;
          adder->slow_dest_dx = 0;
          adder->error_1 = 0;
          adder->error_2 = 0;
          adder->rasterop_mode = DST_WRITE_ENABLE | NORMAL;
          (void)wait_status(adder, RASTEROP_COMPLETE);
          adder->destination_x = cursor[unit].x;
          adder->fast_dest_dx = CHAR_WIDTH;
          adder->destination_y = cursor[unit].y;
          adder->slow_dest_dy = CHAR_HEIGHT;
          /*
           * load SOURCE origin and vectors
           */
          if ((chr - ' ') > (CHARS - 1))  {
                  printf("Invalid character (x)%x in blitc\n",chr);
                  chr = ' ';
          }
          /*
           * X position is modulo the number of characters per line
           */
          adder->source_1_x = FONT_X +
              (((chr - ' ') % (MAX_SCREEN_X/CHAR_WIDTH)) * CHAR_WIDTH);
          /*
           * Point to either first or second row
           */
          adder->source_1_y = 2048 - 15 *
              (((chr - ' ')/(MAX_SCREEN_X/CHAR_WIDTH)) + 1);
          adder->source_1_dx = CHAR_WIDTH;
          adder->source_1_dy = CHAR_HEIGHT;
          write_ID(adder, LU_FUNCTION_R1, FULL_SRC_RESOLUTION | LF_SOURCE);
          adder->cmd = RASTEROP | OCRB | 0 | S1E | DTE;
          /*
           * update console cursor coordinates
           */
          cursor[unit].x += CHAR_WIDTH;
          if (nograph)
                  dga->x_cursor = TRANX(cursor[unit].x);
          if (cursor[unit].x > (1024 - CHAR_WIDTH)) {
                  blitc(unit, '\r');
                  blitc(unit, '\n');
          }
  
  } /* blitc */
  
  /*
   *  INTERRUPT SERVICE ROUTINES
   */
  
  /*
   *  Service "DMA DONE" interrupt condition
   */
  
  static void
  qddint(arg)
          void *arg;
  {
          device_t dv = arg;
          struct DMAreq_header *header;
          struct DMAreq *request;
          volatile struct dga *dga;
          volatile struct adder *adder;
          int cookie;                     /* DMA adrs for QDSS */
          int unit = device_unit(dv);
  
          (void)spl4();                   /* allow interval timer in */
  
          /*
          * init pointers
          */
          header = DMAheader[unit];    /* register for optimization */
          dga = (struct dga *) qdmap[unit].dga;
          adder = (struct adder *) qdmap[unit].adder;
  
          /*
          * if this interrupt flagged as bogus for interrupt flushing purposes..
          */
          if (DMA_ISIGNORE(header)) {
             DMA_CLRIGNORE(header);
                  return;
          }
  
          /*
          * dump a DMA hardware error message if appropriate
          */
          if (dga->csr & DMA_ERR) {
  
                  if (dga->csr & PARITY_ERR)
                      printf("qd%d: qddint: DMA hardware parity fault.\n", unit);
  
                  if (dga->csr & BUS_ERR)
                      printf("qd%d: qddint: DMA hardware bus error.\n", unit);
          }
  
          /*
          * if this was a DMA from user space...
          */
          if (qdflags[unit].user_dma) {
                  qdflags[unit].user_dma = 0;
                  wakeup((void *)&qdflags[unit].user_dma);
                  return;
          }
  
          /*
          * if we're doing DMA request queue services, field the error condition
          */
          if (dga->csr & DMA_ERR) {
  
                  dga->csr &= ~0x0600;            /* halt DMA (reset fifo) */
                  dga->csr |= DMA_ERR;            /* clear error condition */
                  adder->command = CANCEL;        /* cancel adder activity */
  
                  DMA_SETERROR(header);   /* flag error in header status word */
                  DMA_CLRACTIVE(header);
                  header->DMAreq[header->oldest].DMAdone |= HARD_ERROR;
                  header->newest = header->oldest;
                  header->used = 0;
  
                  selnotify(&qdrsel[unit], 0, 0);
  
                  if (dga->bytcnt_lo != 0) {
                          dga->bytcnt_lo = 0;
                          dga->bytcnt_hi = 0;
                          DMA_SETIGNORE(header);
                  }
                  return;
          }
  
          /*
          * if the DMA request queue is now becoming non-full,
          * wakeup "select" client.
          */
          if (DMA_ISFULL(header)) {
                  selnotify(&qdrsel[unit], 0, 0);
          }
  
          header->DMAreq[header->oldest].DMAdone |= REQUEST_DONE;
          QDlast_DMAtype = header->DMAreq[header->oldest].DMAtype;
  
          /* check for unexpected interrupt */
          if (DMA_ISEMPTY(header))
              return;
  
          DMA_GETEND(header);     /* update request queue indices */
  
          /*
          * if no more DMA pending, wake up "select" client and exit
          */
          if (DMA_ISEMPTY(header)) {
                  selnotify(&qdrsel[unit], 0, 0);
                  DMA_CLRACTIVE(header);  /* flag DMA done */
                  return;
          }
  
          /*
          * initiate next DMA xfer
          */
          request = DMA_GETBEGIN(header);
          if (request->DMAtype != QDlast_DMAtype) {
                  dga->csr &= ~0x0600;      /* halt DMA (reset fifo) */
                  adder->command = CANCEL;  /* cancel adder activity */
          }
  
  
          switch (request->DMAtype) {
  
          case DISPLIST:
                  if (request->DMAtype != QDlast_DMAtype) {
                          dga->csr |= DL_ENB;
                          dga->csr &= ~(BTOP_ENB | BYTE_DMA);
                  }
                  break;
  
          case PTOB:
                  if (request->DMAtype != QDlast_DMAtype) {
                          if (request->DMAdone & BYTE_PACK)
                              dga->csr |= (PTOB_ENB | BYTE_DMA);
                          else {
                                  dga->csr |= PTOB_ENB;
                                  dga->csr &= ~BYTE_DMA;
                          }
                  }
                  break;
  
          case BTOP:
                  if (request->DMAtype != QDlast_DMAtype) {
                          if (request->DMAdone & BYTE_PACK) {
                                  dga->csr &= ~DL_ENB;
                                  dga->csr |= (BTOP_ENB | BYTE_DMA);
                          }
                          else {
                                  dga->csr |= BTOP_ENB;
                                  dga->csr &= ~(BYTE_DMA | DL_ENB);
                          }
                  }
                  break;
          default:
                  printf("qd%d: qddint: illegal DMAtype parameter.\n", unit);
                  DMA_CLRACTIVE(header);  /* flag DMA done */
                  return;
          }
  
          if (request->DMAdone & COUNT_ZERO) {
                  dga->csr &= ~SET_DONE_FIFO;
          }
          else if (request->DMAdone & FIFO_EMPTY) {
                  dga->csr |= SET_DONE_FIFO;
          }
  
          if (request->DMAdone & WORD_PACK)
              dga->csr &= ~BYTE_DMA;
          else if (request->DMAdone & BYTE_PACK)
              dga->csr |= BYTE_DMA;
  
          dga->csr |= DMA_IE;
          QDlast_DMAtype = request->DMAtype;
  
          cookie = ((int)request->bufp - (int)header) + (int)header->QBAreg;
  
          dga->adrs_lo = (short) cookie;
          dga->adrs_hi = (short) (cookie >> 16);
  
          dga->bytcnt_lo = (short) request->length;
          dga->bytcnt_hi = (short) (request->length >> 16);
  
          return;
  }
  
  /*
   * ADDER interrupt service routine
   */
  static void
  qdaint(arg)
          void *arg;
  {
          device_t dv = arg;
          volatile struct adder *adder;
          struct color_buf *cbuf;
          int i;
          struct rgb *rgbp;
          volatile short *red;
          volatile short *green;
          volatile short *blue;
          int unit = device_unit(dv);
  
          (void)spl4();                   /* allow interval timer in */
  
          adder = (struct adder *) qdmap[unit].adder;
  
          /*
          * service the vertical blank interrupt (VSYNC bit) by loading
          * any pending color map load request
          */
          if (adder->status & VSYNC) {
                  adder->status &= ~VSYNC;        /* clear the interrupt */
                  cbuf = color_buf[unit];
                  if (cbuf->status & LOAD_COLOR_MAP) {
  
                          red = (short *) qdmap[unit].red;
                          green = (short *) qdmap[unit].green;
                          blue = (short *) qdmap[unit].blue;
  
                          for (i = cbuf->count, rgbp = cbuf->rgb;
                               --i >= 0; rgbp++) {
                                  red[rgbp->offset] = (short) rgbp->red;
                                  green[rgbp->offset] = (short) rgbp->green;
                                  blue[rgbp->offset] = (short) rgbp->blue;
                          }
  
                          cbuf->status &= ~LOAD_COLOR_MAP;
                  }
          }
  
          /*
          * service the scroll interrupt (FRAME_SYNC bit)
          */
          if (adder->status & FRAME_SYNC) {
                  adder->status &= ~FRAME_SYNC;   /* clear the interrupt */
  
                  if (scroll[unit]->status & LOAD_REGS) {
  
                          for (i = 1000, adder->status = 0; i > 0 &&
                               !(adder->status&ID_SCROLL_READY); --i)
                                  ;
  
                          if (i == 0) {
                              printf("qd%d: qdaint: timeout on ID_SCROLL_READY\n",
                                  qd);
                                  return;
                          }
  
                          adder->ID_scroll_data = scroll[unit]->viper_constant;
                          adder->ID_scroll_command = ID_LOAD | SCROLL_CONSTANT;
  
                          adder->y_scroll_constant =
                                  scroll[unit]->y_scroll_constant;
                          adder->y_offset_pending = scroll[unit]->y_offset;
  
                          if (scroll[unit]->status & LOAD_INDEX) {
  
                                  adder->x_index_pending =
                                          scroll[unit]->x_index_pending;
                                  adder->y_index_pending =
                                          scroll[unit]->y_index_pending;
                          }
  
                          scroll[unit]->status = 0x00;
                  }
          }
  }
  
  /*
   *  DUART input interrupt service routine
   *
   *  XXX - this routine should be broken out - it is essentially
   *            straight line code.
   */
  
  static void
  qdiint(void *arg)
  {
          device_t dv = arg;
          struct _vs_event *event;
          struct qdinput *eqh;
          volatile struct dga *dga;
          volatile struct duart *duart;
          struct mouse_report *new_rep;
          struct tty *tp;
          u_short chr;
          u_short status;
          u_short data;
          u_short key;
          char do_wakeup = 0;             /* flag to do a select wakeup call */
          char a, b, c;                   /* mouse button test variables */
          int unit = device_unit(dv);
  
          (void)spl4();                   /* allow interval timer in */
  
          eqh = eq_header[unit];          /* optimized as a register */
          new_rep = &current_rep[unit];
          duart = (struct duart *) qdmap[unit].duart;
  
          /*
          * if the graphic device is turned on..
          */
          if (qdflags[unit].inuse & GRAPHIC_DEV) {
                  /*
                  * empty DUART
                  */
                  while (duart->statusA&RCV_RDY || duart->statusB&RCV_RDY) {
                          /*
                           * pick up LK-201 input (if any)
                           */
                          if (duart->statusA&RCV_RDY) {
  
                                  /* if error condition, then reset it */
  
                                  if (duart->statusA&0x70) {
                                          duart->cmdA = 0x40;
                                          continue;
                                  }
  
                                  /* event queue full now? (overflow condition) */
  
                                  if (ISFULL(eqh) == TRUE) {
                                          printf(
                                           "qd%d: qdiint: event queue overflow\n",
                                             qd);
                                          break;
                                  }
  
                                  /*
                                  * Check for various keyboard errors  */
  
                                  key = duart->dataA & 0xFF;
  
                                  if (key==LK_POWER_ERROR ||
                                      key==LK_KDOWN_ERROR ||
                                      key == LK_INPUT_ERROR ||
                                      key == LK_OUTPUT_ERROR) {
                                          printf(
                                      "qd%d: qdiint: keyboard error, code = %x\n",
                                          qd,key);
                                          return;
                                  }
  
                                  if (key < LK_LOWEST)
                                      return;
  
                                  ++do_wakeup;  /* request a select wakeup call */
  
                                  event = PUTBEGIN(eqh);
                                  PUTEND(eqh);
  
                                  event->vse_key = key;
                                  event->vse_key &= 0x00FF;
                                  event->vse_x = eqh->curs_pos.x;
                                  event->vse_y = eqh->curs_pos.y;
                                  event->vse_time = TOY;
                                  event->vse_type = VSE_BUTTON;
                                  event->vse_direction = VSE_KBTRAW;
                                  event->vse_device = VSE_DKB;
                          }
  
                          /*
                          * pick up the mouse input (if any)  */
  
                          if ((status = duart->statusB) & RCV_RDY  &&
                              qdflags[unit].pntr_id == MOUSE_ID) {
  
                                  if (status & 0x70) {
                                          duart->cmdB = 0x40;
                                          continue;
                                  }
  
                                  /* event queue full now? (overflow condition) */
  
                                  if (ISFULL(eqh) == TRUE) {
                                          printf(
                                          "qd%d: qdiint: event queue overflow\n",
                                               qd);
                                          break;
                                  }
  
                                  data = duart->dataB;    /* get report byte */
                                  ++new_rep->bytcnt; /* bump report byte count */
  
                                  /*
                                  * if 1st byte of report.. */
  
                                  if ( data & START_FRAME) {
                                          new_rep->state = data;
                                          if (new_rep->bytcnt > 1) {
                                                  /* start of new frame */
                                                  new_rep->bytcnt = 1;
                                                  /* ..continue looking */
                                                  continue;
                                          }
                                  }
  
                                  /*
                                  * if 2nd byte of report.. */
  
                                  else if (new_rep->bytcnt == 2) {
                                          new_rep->dx = data & 0x00FF;
                                  }
  
                                  /*
                                  * if 3rd byte of report, load input event queue */
  
                                  else if (new_rep->bytcnt == 3) {
  
                                          new_rep->dy = data & 0x00FF;
                                          new_rep->bytcnt = 0;
  
                                          /*
                                          * if mouse position has changed.. */
  
                                          if (new_rep->dx != 0  ||  new_rep->dy != 0) {
  
                                                  /*
                                                  * calculate acceleration factor, if needed      */
  
                                                  if (qdflags[unit].curs_acc > ACC_OFF) {
  
                                                          if (qdflags[unit].curs_thr <= new_rep->dx)
                                                              new_rep->dx +=
                                                              (new_rep->dx - qdflags[unit].curs_thr)
                                                              * qdflags[unit].curs_acc;
  
                                                          if (qdflags[unit].curs_thr <= new_rep->dy)
                                                              new_rep->dy +=
                                                              (new_rep->dy - qdflags[unit].curs_thr)
                                                              * qdflags[unit].curs_acc;
                                                  }
  
                                                  /*
                                                  * update cursor position coordinates */
  
                                                  if (new_rep->state & X_SIGN) {
                                                          eqh->curs_pos.x += new_rep->dx;
                                                          if (eqh->curs_pos.x > 1023)
                                                              eqh->curs_pos.x = 1023;
                                                  }
                                                  else {
                                                          eqh->curs_pos.x -= new_rep->dx;
                                                          if (eqh->curs_pos.x < -15)
                                                              eqh->curs_pos.x = -15;
                                                  }
  
                                                  if (new_rep->state & Y_SIGN) {
                                                          eqh->curs_pos.y -= new_rep->dy;
                                                          if (eqh->curs_pos.y < -15)
                                                              eqh->curs_pos.y = -15;
                                                  }
                                                  else {
                                                          eqh->curs_pos.y += new_rep->dy;
                                                          if (eqh->curs_pos.y > 863)
                                                              eqh->curs_pos.y = 863;
                                                  }
  
                                                  /*
                                                  * update cursor screen position */
  
                                                  dga = (struct dga *) qdmap[unit].dga;
                                                  dga->x_cursor = TRANX(eqh->curs_pos.x);
                                                  dga->y_cursor = TRANY(eqh->curs_pos.y);
  
                                                  /*
                                                  * if cursor is in the box, no event report */
  
                                                  if (eqh->curs_pos.x <= eqh->curs_box.right      &&
                                                      eqh->curs_pos.x >= eqh->curs_box.left  &&
                                                      eqh->curs_pos.y >= eqh->curs_box.top  &&
                                                      eqh->curs_pos.y <= eqh->curs_box.bottom ) {
                                                          goto GET_MBUTTON;
                                                  }
  
                                                  /*
                                                  * report the mouse motion event */
  
                                                  event = PUTBEGIN(eqh);
                                                  PUTEND(eqh);
  
                                                  ++do_wakeup;   /* request a select wakeup call */
  
                                                  event->vse_x = eqh->curs_pos.x;
                                                  event->vse_y = eqh->curs_pos.y;
  
                                                  event->vse_device = VSE_MOUSE;  /* mouse */
                                                  event->vse_type = VSE_MMOTION;  /* pos changed */
                                                  event->vse_key = 0;
                                                  event->vse_direction = 0;
                                                  event->vse_time = TOY;  /* time stamp */
                                          }
  
  GET_MBUTTON:
                                          /*
                                          * if button state has changed */
  
                                          a = new_rep->state & 0x07;    /*mask nonbutton bits */
                                          b = last_rep[unit].state & 0x07;
  
                                          if (a ^ b) {
  
                                                  for ( c = 1;  c < 8; c <<= 1) {
  
                                                          if (!( c & (a ^ b))) /* this button change? */
                                                              continue;
  
                                                          /* event queue full? (overflow condition) */
  
                                                          if (ISFULL(eqh) == TRUE) {
                                                                  printf("qd%d: qdiint: event queue overflow\n", qd);
                                                                  break;
                                                          }
  
                                                          event = PUTBEGIN(eqh);  /* get new event */
                                                          PUTEND(eqh);
  
                                                          ++do_wakeup;   /* request select wakeup */
  
                                                          event->vse_x = eqh->curs_pos.x;
                                                          event->vse_y = eqh->curs_pos.y;
  
                                                          event->vse_device = VSE_MOUSE;  /* mouse */
                                                          event->vse_type = VSE_BUTTON; /* new button */
                                                          event->vse_time = TOY;        /* time stamp */
  
                                                          /* flag changed button and if up or down */
  
                                                          if (c == RIGHT_BUTTON)
                                                              event->vse_key = VSE_RIGHT_BUTTON;
                                                          else if (c == MIDDLE_BUTTON)
                                                              event->vse_key = VSE_MIDDLE_BUTTON;
                                                          else if (c == LEFT_BUTTON)
                                                              event->vse_key = VSE_LEFT_BUTTON;
  
                                                          /* set bit = button depressed */
  
                                                          if (c & a)
                                                              event->vse_direction = VSE_KBTDOWN;
                                                          else
                                                                  event->vse_direction = VSE_KBTUP;
                                                  }
                                          }
  
                                          /* refresh last report */
  
                                          last_rep[unit] = current_rep[unit];
  
                                  }  /* get last byte of report */
                          } else if ((status = duart->statusB)&RCV_RDY &&
                                     qdflags[unit].pntr_id == TABLET_ID) {
                                  /*
                                  * pickup tablet input, if any
                                  */
                                  if (status&0x70) {
                                          duart->cmdB = 0x40;
                                          continue;
                                  }
                                  /*
                                   * event queue full now? (overflow condition)
                                   */
                                  if (ISFULL(eqh) == TRUE) {
                                          printf("qd%d: qdiint: event queue overflow\n", qd);
                                          break;
                                  }
  
                                  data = duart->dataB;    /* get report byte */
                                  ++new_rep->bytcnt;      /* bump report byte count */
  
                                  /*
                                  * if 1st byte of report.. */
  
                                  if (data & START_FRAME) {
                                          new_rep->state = data;
                                          if (new_rep->bytcnt > 1) {
                                                  new_rep->bytcnt = 1;    /* start of new frame */
                                                  continue;                   /* ..continue looking */
                                          }
                                  }
  
                                  /*
                                  * if 2nd byte of report.. */
  
                                  else if (new_rep->bytcnt == 2) {
                                          new_rep->dx = data & 0x3F;
                                  }
  
                                  /*
                                  * if 3rd byte of report.. */
  
                                  else if (new_rep->bytcnt == 3) {
                                          new_rep->dx |= (data & 0x3F) << 6;
                                  }
  
                                  /*
                                  * if 4th byte of report.. */
  
                                  else if (new_rep->bytcnt == 4) {
                                          new_rep->dy = data & 0x3F;
                                  }
  
                                  /*
                                  * if 5th byte of report, load input event queue */
  
                                  else if (new_rep->bytcnt == 5) {
  
                                          new_rep->dy |= (data & 0x3F) << 6;
                                          new_rep->bytcnt = 0;
  
                                          /*
                                          * update cursor position coordinates */
  
                                          new_rep->dx /= qdflags[unit].tab_res;
                                          new_rep->dy = (2200 - new_rep->dy)
                                              / qdflags[unit].tab_res;
  
                                          if (new_rep->dx > 1023) {
                                                  new_rep->dx = 1023;
                                          }
                                          if (new_rep->dy > 863) {
                                                  new_rep->dy = 863;
                                          }
  
                                          /*
                                          * report an event if the puck/stylus has moved
                                          */
  
                                          if (eqh->curs_pos.x != new_rep->dx ||
                                              eqh->curs_pos.y != new_rep->dy) {
  
                                                  eqh->curs_pos.x = new_rep->dx;
                                                  eqh->curs_pos.y = new_rep->dy;
  
                                                  /*
                                                  * update cursor screen position */
  
                                                  dga = (struct dga *) qdmap[unit].dga;
                                                  dga->x_cursor = TRANX(eqh->curs_pos.x);
                                                  dga->y_cursor = TRANY(eqh->curs_pos.y);
  
                                                  /*
                                                  * if cursor is in the box, no event report
                                                  */
  
                                                  if (eqh->curs_pos.x <= eqh->curs_box.right      &&
                                                      eqh->curs_pos.x >= eqh->curs_box.left  &&
                                                      eqh->curs_pos.y >= eqh->curs_box.top  &&
                                                      eqh->curs_pos.y <= eqh->curs_box.bottom ) {
                                                          goto GET_TBUTTON;
                                                  }
  
                                                  /*
                                                  * report the tablet motion event */
  
                                                  event = PUTBEGIN(eqh);
                                                  PUTEND(eqh);
  
                                                  ++do_wakeup;   /* request a select wakeup call */
  
                                                  event->vse_x = eqh->curs_pos.x;
                                                  event->vse_y = eqh->curs_pos.y;
  
                                                  event->vse_device = VSE_TABLET;  /* tablet */
                                                  /*
                                                  * right now, X handles tablet motion the same
                                                  * as mouse motion
                                                  */
                                                  event->vse_type = VSE_MMOTION;   /* pos changed */
                                                  event->vse_key = 0;
                                                  event->vse_direction = 0;
                                                  event->vse_time = TOY;  /* time stamp */
                                          }
  GET_TBUTTON:
                                          /*
                                          * if button state has changed */
  
                                          a = new_rep->state & 0x1E;   /* mask nonbutton bits */
                                          b = last_rep[unit].state & 0x1E;
  
                                          if (a ^ b) {
  
                                                  /* event queue full now? (overflow condition) */
  
                                                  if (ISFULL(eqh) == TRUE) {
                                                          printf("qd%d: qdiint: event queue overflow\n",qd);
                                                          break;
                                                  }
  
                                                  event = PUTBEGIN(eqh);  /* get new event */
                                                  PUTEND(eqh);
  
                                                  ++do_wakeup;   /* request a select wakeup call */
  
                                                  event->vse_x = eqh->curs_pos.x;
                                                  event->vse_y = eqh->curs_pos.y;
  
                                                  event->vse_device = VSE_TABLET;  /* tablet */
                                                  event->vse_type = VSE_BUTTON; /* button changed */
                                                  event->vse_time = TOY;     /* time stamp */
  
                                                  /* define the changed button and if up or down */
  
                                                  for ( c = 1;  c <= 0x10; c <<= 1) {
                                                          if (c & (a ^ b)) {
                                                                  if (c == T_LEFT_BUTTON)
                                                                      event->vse_key = VSE_T_LEFT_BUTTON;
                                                                  else if (c == T_FRONT_BUTTON)
                                                                      event->vse_key = VSE_T_FRONT_BUTTON;
                                                                  else if (c == T_RIGHT_BUTTON)
                                                                      event->vse_key = VSE_T_RIGHT_BUTTON;
                                                                  else if (c == T_BACK_BUTTON)
                                                                      event->vse_key = VSE_T_BACK_BUTTON;
                                                                  break;
                                                          }
                                                  }
  
                                                  /* set bit = button depressed */
  
                                                  if (c & a)
                                                      event->vse_direction = VSE_KBTDOWN;
                                                  else
                                                          event->vse_direction = VSE_KBTUP;
                                          }
  
                                          /* refresh last report */
  
                                          last_rep[unit] = current_rep[unit];
  
                                  } /* get last byte of report */
                          } /* pick up tablet input */
  
                  } /* while input available.. */
  
                  /*
                  * do select wakeup
                  */
                  if (do_wakeup) {
                          selnotify(&qdrsel[unit], 0, 0);
                          do_wakeup = 0;
                  }
          } else {
                  /*
                   * if the graphic device is not turned on, this is console input
                   */
                  if (qdpolling)
                          return;
  
                  if (unit >= qd_cd.cd_ndevs || device_lookup(&qd_cd, unit) == NULL)
                          return;         /* no such device or address */
  
                  tp = qd_tty[unit << 2];
  
                  /*
                   * Get a character from the keyboard.
                   */
                  while (duart->statusA&RCV_RDY) {
                          key = duart->dataA;
                          key &= 0xFF;
                          /*
                          * Check for various keyboard errors
                          */
                          if (key == LK_POWER_ERROR || key == LK_KDOWN_ERROR ||
                              key == LK_INPUT_ERROR || key == LK_OUTPUT_ERROR) {
                                  printf("qd%d: qdiint: Keyboard error, code = %x\n",qd,key);
                                  return;
                          }
  
                          if (key < LK_LOWEST)
                              return;
  
                          /*
                          * See if its a state change key */
  
                          switch (key) {
  
                          case LOCK:
                                  q_keyboard.lock ^= 0xffff;      /* toggle */
                                  if (q_keyboard.lock)
                                          led_control(qd, LK_LED_ENABLE,
                                                            LK_LED_LOCK);
                                  else
                                          led_control(qd, LK_LED_DISABLE,
                                                            LK_LED_LOCK);
                                  return;
  
                          case SHIFT:
                                  q_keyboard.shift ^= 0xFFFF;
                                  return;
  
                          case CNTRL:
                                  q_keyboard.cntrl ^= 0xFFFF;
                                  return;
  
                          case ALLUP:
                                  q_keyboard.cntrl = 0;
                                  q_keyboard.shift = 0;
                                  return;
  
                          case REPEAT:
                                  chr = q_keyboard.last;
                                  break;
  
                                  /*
                                  * Test for cntrl characters. If set, see if the character
                                  * is elligible to become a control character. */
  
                          default:
  
                                  if (q_keyboard.cntrl) {
                                          chr = q_key[key];
                                          if (chr >= ' ' && chr <= '~')
                                              chr &= 0x1F;
                                          else if (chr >= 0xA1 && chr <= 0xFE)
                                              chr &= 0x9F;
                                  }
                                  else if( q_keyboard.lock || q_keyboard.shift )
                                      chr = q_shift_key[key];
                                  else
                                          chr = q_key[key];
                                  break;
                          }
  
                          q_keyboard.last = chr;
  
                          /*
                          * Check for special function keys */
  
                          if (chr & 0x100) {
                                  char *string;
                                  string = q_special[chr & 0x7F];
                                  while(*string)
                                      (*tp->t_linesw->l_rint)(*string++, tp);
                          }
                          else {
  #ifdef DDB
                                  /* Check for kernel debugger escape here */
                                  int j;
  
                                  j = kdbrint(chr&0177);
  
                                  if (j == 1)  /* Escape received, just return */
                                      return;
  
                                  if (j == 2)  /* Second char wasn't 'D' */
                                      (*tp->t_linesw->l_rint)(27, tp);
  #endif
                                  (*tp->t_linesw->l_rint)(chr&0177, tp);
                          }
                  }
          }
  } /* qdiint */
  
  /*
   *
   * Clear the QDSS screen
   *
   *                           >>> NOTE <<<
   *
   *   This code requires that certain adder initialization be valid.  To
   *   assure that this requirement is satisfied, this routine should be
   *   called only after calling the "setup_dragon()" function.
   *
   *   Clear the bitmap a piece at a time. Since the fast scroll clear
   *   only clears the current displayed portion of the bitmap put a
   *   temporary value in the y limit register so we can access whole
   *   bitmap
   *
   */
  void
  clear_qd_screen(unit)
          int unit;
  {
          volatile struct adder *adder;
          adder = (struct adder *) qdmap[unit].adder;
  
          adder->x_limit = 1024;
          adder->y_limit = 2048 - CHAR_HEIGHT;
          adder->y_offset_pending = 0;
  #define WSV  (void)wait_status(adder, VSYNC); (void)wait_status(adder, VSYNC)
          WSV;
          adder->y_scroll_constant = SCROLL_ERASE;
          WSV;
          adder->y_offset_pending = 864;
          WSV;
          adder->y_scroll_constant = SCROLL_ERASE;
          WSV;
          adder->y_offset_pending = 1728;
          WSV;
          adder->y_scroll_constant = SCROLL_ERASE;
          WSV;
          adder->y_offset_pending = 0;     /* back to normal */
          WSV;
          adder->x_limit = MAX_SCREEN_X;
          adder->y_limit = MAX_SCREEN_Y + FONT_HEIGHT;
  #undef WSV
  
  } /* clear_qd_screen */
  
  /*
   *  kernel console output to the glass tty
   */
  void
  qdcnputc(dev, chr)
          dev_t dev;
          int chr;
  {
  
          /*
           * if system is now physical, forget it (ie: crash DUMP)
           */
          if ((mfpr(PR_MAPEN) & 1) == 0)
                  return;
  
          blitc(0, (u_char)(chr & 0xff));
          if ((chr & 0177) == '\n')
                  blitc(0, '\r');
  
  } /* qdputc */
  
  /*
   *  load the mouse cursor's template RAM bitmap
   */
  void
  ldcursor(unit, bitmap)
          int unit;
          short *bitmap;
  {
          volatile struct dga *dga;
          volatile short *temp;
          int i;
          int curs;
  
          dga = (struct dga *) qdmap[unit].dga;
          temp = (short *) qdmap[unit].template;
  
          if (dga->csr & CURS_ENB) {      /* if the cursor is enabled.. */
                  curs = -1;              /* ..note that.. */
                  dga->csr &= ~CURS_ENB;  /* ..and shut it off */
          } else
                  curs = 0;
  
          dga->csr &= ~CURS_ENB;          /* shut off the cursor */
  
          temp += (8 * 1024) - 32;        /* cursor is 32 WORDS from the end */
          /* ..of the 8k WORD template space */
          for (i = 0; i < 32; ++i)
                  *temp++ = *bitmap++;
  
          if (curs) {                     /* if cursor was enabled.. */
                  dga->csr |= CURS_ENB;   /* ..turn it back on */
          }
  
  } /* ldcursor */
  
  /*
   *  Put the console font in the QDSS off-screen memory
   */
  void
  ldfont(unit)
          int unit;
  {
          volatile struct adder *adder;
  
          int i, j, k, max_chars_line;
          short packed;
  
          adder = (struct adder *) qdmap[unit].adder;
  
          /*
          * setup VIPER operand control registers
          */
          write_ID(adder, MASK_1, 0xFFFF);
          write_ID(adder, VIPER_Z_LOAD | FOREGROUND_COLOR_Z, 255);
          write_ID(adder, VIPER_Z_LOAD | BACKGROUND_COLOR_Z, 0);
  
          write_ID(adder, SRC1_OCR_B,
          EXT_NONE | INT_NONE | ID | BAR_SHIFT_DELAY);
          write_ID(adder, SRC2_OCR_B,
          EXT_NONE | INT_NONE | ID | BAR_SHIFT_DELAY);
          write_ID(adder, DST_OCR_B,
          EXT_SOURCE | INT_NONE | NO_ID | NO_BAR_SHIFT_DELAY);
  
          adder->rasterop_mode = DST_WRITE_ENABLE | DST_INDEX_ENABLE | NORMAL;
  
          /*
          * load destination data
          */
          (void)wait_status(adder, RASTEROP_COMPLETE);
  
          adder->destination_x = FONT_X;
          adder->destination_y = FONT_Y;
  #if FONT_WIDTH > MAX_SCREEN_X
          adder->fast_dest_dx = MAX_SCREEN_X;
  #else
          adder->fast_dest_dx = FONT_WIDTH;
  #endif
          adder->slow_dest_dy = CHAR_HEIGHT;
  
          /*
          * setup for processor to bitmap xfer  */
  
          write_ID(adder, CS_UPDATE_MASK, 0x0001);
          adder->cmd = PBT | OCRB | 2 | DTE | 2;
  
          /*
          * Figure out how many characters can be stored on one "line" of
          * offscreen memory.
          */
          max_chars_line = MAX_SCREEN_X/(CHAR_WIDTH*2);
          if ((CHARS/2 + CHARS%2) < max_chars_line)
              max_chars_line = CHARS/2 + CHARS%2;
  
          /*
          * iteratively do the processor to bitmap xfer */
  
          for (i = 0; i < ROWS; ++i) {
  
                  /* PTOB a scan line */
  
                  for (j = 0, k = i; j < max_chars_line; ++j) {
                          /* PTOB one scan of a char cell */
  
                          packed = q_font[k];
                          k += ROWS;
                          packed |= ((short)q_font[k] << 8);
                          k += ROWS;
  
                          (void)wait_status(adder, TX_READY);
                          adder->id_data = packed;
                  }
          }
  
          /*
           * (XXX XXX XXX - should remove)
           *
           * Copy the second row of characters.  Subtract the first
           * row from the total number.  Divide this quantity by 2
           * because 2 chars are stored in a short in the PTOB loop
           * below.  Figure out how many characters can be stored on
           * one "line" of offscreen memory
           */
  
          max_chars_line = MAX_SCREEN_X/(CHAR_WIDTH*2);
          if ((CHARS/2 + CHARS%2) < max_chars_line)
              return;
          max_chars_line = (CHARS/2 + CHARS%2) - max_chars_line; /* 95 - 64 */
          /* Paranoia check to see if 3rd row may be needed */
          if (max_chars_line > (MAX_SCREEN_X/(CHAR_WIDTH*2)))
              max_chars_line = MAX_SCREEN_X/(CHAR_WIDTH*2);
  
          adder->destination_x = FONT_X;
          adder->destination_y = FONT_Y - CHAR_HEIGHT;
          adder->fast_dest_dx = max_chars_line * CHAR_WIDTH * 2;
          adder->slow_dest_dy = CHAR_HEIGHT;
  
          /*
          * setup for processor to bitmap xfer
          */
          write_ID(adder, CS_UPDATE_MASK, 0x0001);
          adder->cmd = PBT | OCRB | 2 | DTE | 2;
  
          /*
          * iteratively do the processor to bitmap xfer
          */
          for (i = 0; i < ROWS; ++i) {
                  /*
                   * PTOB a scan line
                   */
                  for (j = 0, k = i; j < max_chars_line; ++j) {
                          /*
                           * PTOB one scan of a char cell
                           */
                          packed = q_font[k + FONT_OFFSET];
                          k += ROWS;
                          packed |= ((short)q_font[k + FONT_OFFSET] << 8);
                          k += ROWS;
                          (void)wait_status(adder, TX_READY);
                          adder->id_data = packed;
                  }
          }
  
  }  /* ldfont */
  
  
  /*
   * Disable or enable polling.  This is used when entering or leaving the
   * kernel debugger.
   */
  void
  qdcnpollc(dev, onoff)
          dev_t dev;
          int onoff;
  {
          qdpolling = onoff;
  }
  
  
  /*
   *  Get a character from the LK201 (polled)
   */
  int
  qdcngetc(dev)
          dev_t dev;
  {
          short key;
          char chr;
          volatile struct duart *duart;
  
          duart = (struct duart *) qdmap[0].duart;
  
          /*
          * Get a character from the keyboard.
          */
  LOOP:
          while (!(duart->statusA&RCV_RDY))
                  ;
  
          key = duart->dataA;
          key &= 0xFF;
  
          /*
          * Check for various keyboard errors  */
  
          if (key == LK_POWER_ERROR || key == LK_KDOWN_ERROR ||
              key == LK_INPUT_ERROR || key == LK_OUTPUT_ERROR) {
                  printf("Keyboard error, code = %x\n", key);
                  return(0);
          }
  
          if (key < LK_LOWEST)
                  return(0);
  
          /*
           * See if its a state change key
           */
          switch (key) {
  
          case LOCK:
                  q_keyboard.lock ^= 0xffff;      /* toggle */
                  if (q_keyboard.lock)
                          led_control(0, LK_LED_ENABLE, LK_LED_LOCK);
                  else
                          led_control(0, LK_LED_DISABLE, LK_LED_LOCK);
                  goto LOOP;
  
          case SHIFT:
                  q_keyboard.shift ^= 0xFFFF;
                  goto LOOP;
  
          case CNTRL:
                  q_keyboard.cntrl ^= 0xFFFF;
                  goto LOOP;
  
          case ALLUP:
                  q_keyboard.cntrl = 0;
                  q_keyboard.shift = 0;
                  goto LOOP;
  
          case REPEAT:
                  chr = q_keyboard.last;
                  break;
  
                  /*
                  * Test for cntrl characters. If set, see if the character
                  * is elligible to become a control character.
                  */
          default:
  
                  if (q_keyboard.cntrl) {
                          chr = q_key[key];
                          if (chr >= ' ' && chr <= '~')
                              chr &= 0x1F;
                  }
                  else if ( q_keyboard.lock || q_keyboard.shift )
                      chr = q_shift_key[key];
                  else
                          chr = q_key[key];
                  break;
          }
  
          if (chr < ' ' && chr > '~')     /* if input is non-displayable */
                  return(0);              /* ..then pitch it! */
  
          q_keyboard.last = chr;
  
          /*
          * Check for special function keys */
  
          if (chr & 0x80)                 /* pitch the function keys */
                  return(0);
          else
                  return(chr);
  
  } /* qdgetc */
  
  /*
   *  led_control()... twiddle LK-201 LED's
   */
  void
  led_control(unit, cmd, led_mask)
          int unit, cmd, led_mask;
  {
          int i;
          volatile struct duart *duart;
  
          duart = (struct duart *)qdmap[unit].duart;
  
          for (i = 1000; i > 0; --i) {
                  if (duart->statusA&XMT_RDY) {
                          duart->dataA = cmd;
                          break;
                  }
          }
          for (i = 1000; i > 0; --i) {
                  if (duart->statusA&XMT_RDY) {
                          duart->dataA = led_mask;
                          break;
                  }
          }
          return;
  
  } /* led_control */
  
  /*
   *  scroll_up()... move the screen up one character height
   */
  void
  scroll_up(adder)
          volatile struct adder *adder;
  {
          /*
          * setup VIPER operand control registers
          */
          (void)wait_status(adder, ADDRESS_COMPLETE);
          write_ID(adder, CS_UPDATE_MASK, 0x00FF);  /* select all planes */
          write_ID(adder, MASK_1, 0xFFFF);
          write_ID(adder, VIPER_Z_LOAD | FOREGROUND_COLOR_Z, 255);
          write_ID(adder, VIPER_Z_LOAD | BACKGROUND_COLOR_Z, 0);
          write_ID(adder, SRC1_OCR_B,
          EXT_NONE | INT_SOURCE | ID | BAR_SHIFT_DELAY);
          write_ID(adder, DST_OCR_B,
          EXT_NONE | INT_NONE | NO_ID | NO_BAR_SHIFT_DELAY);
          /*
           * load DESTINATION origin and vectors
           */
          adder->fast_dest_dy = 0;
          adder->slow_dest_dx = 0;
          adder->error_1 = 0;
          adder->error_2 = 0;
          adder->rasterop_mode = DST_WRITE_ENABLE | NORMAL;
          adder->destination_x = 0;
          adder->fast_dest_dx = 1024;
          adder->destination_y = 0;
          adder->slow_dest_dy = 864 - CHAR_HEIGHT;
          /*
           * load SOURCE origin and vectors
           */
          adder->source_1_x = 0;
          adder->source_1_dx = 1024;
          adder->source_1_y = 0 + CHAR_HEIGHT;
          adder->source_1_dy = 864 - CHAR_HEIGHT;
          write_ID(adder, LU_FUNCTION_R1, FULL_SRC_RESOLUTION | LF_SOURCE);
          adder->cmd = RASTEROP | OCRB | 0 | S1E | DTE;
          /*
           * do a rectangle clear of last screen line
           */
          write_ID(adder, MASK_1, 0xffff);
          write_ID(adder, SOURCE, 0xffff);
          write_ID(adder,DST_OCR_B,
          (EXT_NONE | INT_NONE | NO_ID | NO_BAR_SHIFT_DELAY));
          write_ID(adder, VIPER_Z_LOAD | FOREGROUND_COLOR_Z, 0);
          adder->error_1 = 0;
          adder->error_2 = 0;
          adder->slow_dest_dx = 0;                /* set up the width of  */
          adder->slow_dest_dy = CHAR_HEIGHT;      /* rectangle */
          adder->rasterop_mode = (NORMAL | DST_WRITE_ENABLE) ;
          (void)wait_status(adder, RASTEROP_COMPLETE);
          adder->destination_x = 0;
          adder->destination_y = 864 - CHAR_HEIGHT;
          adder->fast_dest_dx = 1024;     /* set up the height    */
          adder->fast_dest_dy = 0;        /* of rectangle         */
          write_ID(adder, LU_FUNCTION_R2, (FULL_SRC_RESOLUTION | LF_SOURCE));
          adder->cmd = (RASTEROP | OCRB | LF_R2 | DTE ) ;
  
  } /* scroll_up */
  
  /*
   *  init shared memory pointers and structures
   */
  void
  init_shared(unit)
          int unit;
  {
          volatile struct dga *dga;
  
          dga = (struct dga *) qdmap[unit].dga;
  
          /*
          * initialize the event queue pointers and header */
  
          eq_header[unit] = (struct qdinput *)
              ((((int)event_shared & ~(0x01FF)) + 512)
                  + (EVENT_BUFSIZE * unit));
          eq_header[unit]->curs_pos.x = 0;
          eq_header[unit]->curs_pos.y = 0;
          dga->x_cursor = TRANX(eq_header[unit]->curs_pos.x);
          dga->y_cursor = TRANY(eq_header[unit]->curs_pos.y);
          eq_header[unit]->curs_box.left = 0;
          eq_header[unit]->curs_box.right = 0;
          eq_header[unit]->curs_box.top = 0;
          eq_header[unit]->curs_box.bottom = 0;
          /*
           * assign a pointer to the DMA I/O buffer for this QDSS.
           */
          DMAheader[unit] = (struct DMAreq_header *)
              (((int)(&DMA_shared[0] + 512) & ~0x1FF)
                  + (DMAbuf_size * unit));
          DMAheader[unit]->DMAreq = (struct DMAreq *) ((int)DMAheader[unit]
              + sizeof(struct DMAreq_header));
          DMAheader[unit]->QBAreg = 0;
          DMAheader[unit]->status = 0;
          DMAheader[unit]->shared_size = DMAbuf_size;
          DMAheader[unit]->used = 0;
          DMAheader[unit]->size = 10;     /* default = 10 requests */
          DMAheader[unit]->oldest = 0;
          DMAheader[unit]->newest = 0;
          /*
          * assign a pointer to the scroll structure for this QDSS.
          */
          scroll[unit] = (struct scroll *)
              (((int)(&scroll_shared[0] + 512) & ~0x1FF)
                  + (sizeof(struct scroll) * unit));
          scroll[unit]->status = 0;
          scroll[unit]->viper_constant = 0;
          scroll[unit]->y_scroll_constant = 0;
          scroll[unit]->y_offset = 0;
          scroll[unit]->x_index_pending = 0;
          scroll[unit]->y_index_pending = 0;
          /*
          * assign a pointer to the color map write buffer for this QDSS
          */
          color_buf[unit] = (struct color_buf *)
              (((int)(&color_shared[0] + 512) & ~0x1FF)
                  + (COLOR_BUFSIZ * unit));
          color_buf[unit]->status = 0;
          color_buf[unit]->count = 0;
  
  } /* init_shared */
  
  /*
   * init the ADDER, VIPER, bitmaps, & color map
   */
  void
  setup_dragon(unit)
          int unit;
  {
  
          volatile struct adder *adder;
          volatile struct dga *dga;
          volatile short *memcsr;
          int i;
          short top;              /* clipping/scrolling boundaries */
          short bottom;
          short right;
          short left;
          volatile short *red;            /* color map pointers */
          volatile short *green;
          volatile short *blue;
  
          /*
          * init for setup
          */
          adder = (struct adder *) qdmap[unit].adder;
          dga = (struct dga *) qdmap[unit].dga;
          memcsr = (short *) qdmap[unit].memcsr;
          dga->csr &= ~(DMA_IE | 0x700);  /* halt DMA and kill the intrpts */
          *memcsr = SYNC_ON;              /* blank screen and turn off LED's */
          adder->command = CANCEL;
          /*
          * set monitor timing
          */
          adder->x_scan_count_0 = 0x2800;
          adder->x_scan_count_1 = 0x1020;
          adder->x_scan_count_2 = 0x003A;
          adder->x_scan_count_3 = 0x38F0;
          adder->x_scan_count_4 = 0x6128;
          adder->x_scan_count_5 = 0x093A;
          adder->x_scan_count_6 = 0x313C;
          adder->sync_phase_adj = 0x0100;
          adder->x_scan_conf = 0x00C8;
          /*
           * got a bug in secound pass ADDER! lets take care of it
           *
           * normally, just use the code in the following bug fix code, but to
           * make repeated demos look pretty, load the registers as if there was
           * no bug and then test to see if we are getting sync
           */
          adder->y_scan_count_0 = 0x135F;
          adder->y_scan_count_1 = 0x3363;
          adder->y_scan_count_2 = 0x2366;
          adder->y_scan_count_3 = 0x0388;
          /*
           * if no sync, do the bug fix code
           */
          if (wait_status(adder, VSYNC) == BAD) {
                  /* first load all Y scan registers with very short frame and
                   * wait for scroll service.  This guarantees at least one SYNC
                   * to fix the pass 2 Adder initialization bug (synchronizes
                   * XCINCH with DMSEEDH)
                   */
                  adder->y_scan_count_0 = 0x01;
                  adder->y_scan_count_1 = 0x01;
                  adder->y_scan_count_2 = 0x01;
                  adder->y_scan_count_3 = 0x01;
                  /*
                   * delay at least 1 full frame time
                   */
                  (void)wait_status(adder, VSYNC);
                  (void)wait_status(adder, VSYNC);
                  /*
                   * now load the REAL sync values (in reverse order just to
                   * be safe.
                   */
                  adder->y_scan_count_3 = 0x0388;
                  adder->y_scan_count_2 = 0x2366;
                  adder->y_scan_count_1 = 0x3363;
                  adder->y_scan_count_0 = 0x135F;
          }
          *memcsr = SYNC_ON | UNBLANK;    /* turn off leds and turn on video */
          /*
           * zero the index registers
           */
          adder->x_index_pending = 0;
          adder->y_index_pending = 0;
          adder->x_index_new = 0;
          adder->y_index_new = 0;
          adder->x_index_old = 0;
          adder->y_index_old = 0;
          adder->pause = 0;
          /*
           * set rasterop mode to normal pen down
           */
          adder->rasterop_mode = DST_WRITE_ENABLE | DST_INDEX_ENABLE | NORMAL;
          /*
           * set the rasterop registers to a default values
           */
          adder->source_1_dx = 1;
          adder->source_1_dy = 1;
          adder->source_1_x = 0;
          adder->source_1_y = 0;
          adder->destination_x = 0;
          adder->destination_y = 0;
          adder->fast_dest_dx = 1;
          adder->fast_dest_dy = 0;
          adder->slow_dest_dx = 0;
          adder->slow_dest_dy = 1;
          adder->error_1 = 0;
          adder->error_2 = 0;
          /*
           * scale factor = UNITY
           */
          adder->fast_scale = UNITY;
          adder->slow_scale = UNITY;
          /*
           * set the source 2 parameters
           */
          adder->source_2_x = 0;
          adder->source_2_y = 0;
          adder->source_2_size = 0x0022;
          /*
          * initialize plane addresses for eight vipers
          */
          write_ID(adder, CS_UPDATE_MASK, 0x0001);
          write_ID(adder, PLANE_ADDRESS, 0x0000);
          write_ID(adder, CS_UPDATE_MASK, 0x0002);
          write_ID(adder, PLANE_ADDRESS, 0x0001);
          write_ID(adder, CS_UPDATE_MASK, 0x0004);
          write_ID(adder, PLANE_ADDRESS, 0x0002);
          write_ID(adder, CS_UPDATE_MASK, 0x0008);
          write_ID(adder, PLANE_ADDRESS, 0x0003);
          write_ID(adder, CS_UPDATE_MASK, 0x0010);
          write_ID(adder, PLANE_ADDRESS, 0x0004);
          write_ID(adder, CS_UPDATE_MASK, 0x0020);
          write_ID(adder, PLANE_ADDRESS, 0x0005);
          write_ID(adder, CS_UPDATE_MASK, 0x0040);
          write_ID(adder, PLANE_ADDRESS, 0x0006);
          write_ID(adder, CS_UPDATE_MASK, 0x0080);
          write_ID(adder, PLANE_ADDRESS, 0x0007);
          /*
           * initialize the external registers.
           */
          write_ID(adder, CS_UPDATE_MASK, 0x00FF);
          write_ID(adder, CS_SCROLL_MASK, 0x00FF);
          /*
           * initialize resolution mode
           */
          write_ID(adder, MEMORY_BUS_WIDTH, 0x000C);      /* bus width = 16 */
          write_ID(adder, RESOLUTION_MODE, 0x0000);       /* one bit/pixel */
          /*
           * initialize viper registers
           */
          write_ID(adder, SCROLL_CONSTANT, SCROLL_ENABLE|VIPER_LEFT|VIPER_UP);
          write_ID(adder, SCROLL_FILL, 0x0000);
          /*
           * set clipping and scrolling limits to full screen
           */
          for (i = 1000, adder->status = 0;
               i > 0 && !(adder->status&ADDRESS_COMPLETE); --i)
                  ;
          if (i == 0)
              printf("qd%d: setup_dragon: timeout on ADDRESS_COMPLETE\n",unit);
          top = 0;
          bottom = 2048;
          left = 0;
          right = 1024;
          adder->x_clip_min = left;
          adder->x_clip_max = right;
          adder->y_clip_min = top;
          adder->y_clip_max = bottom;
          adder->scroll_x_min = left;
          adder->scroll_x_max = right;
          adder->scroll_y_min = top;
          adder->scroll_y_max = bottom;
          (void)wait_status(adder, VSYNC);        /* wait at LEAST 1 full frame */
          (void)wait_status(adder, VSYNC);
          adder->x_index_pending = left;
          adder->y_index_pending = top;
          adder->x_index_new = left;
          adder->y_index_new = top;
          adder->x_index_old = left;
          adder->y_index_old = top;
  
          for (i = 1000, adder->status = 0; i > 0 &&
               !(adder->status&ADDRESS_COMPLETE) ; --i)
                  ;
          if (i == 0)
                  printf("qd%d: setup_dragon: timeout on ADDRESS_COMPLETE\n",unit);
  
          write_ID(adder, LEFT_SCROLL_MASK, 0x0000);
          write_ID(adder, RIGHT_SCROLL_MASK, 0x0000);
          /*
          * set source and the mask register to all ones (ie: white) o
          */
          write_ID(adder, SOURCE, 0xFFFF);
          write_ID(adder, MASK_1, 0xFFFF);
          write_ID(adder, VIPER_Z_LOAD | FOREGROUND_COLOR_Z, 255);
          write_ID(adder, VIPER_Z_LOAD | BACKGROUND_COLOR_Z, 0);
          /*
          * initialize Operand Control Register banks for fill command
          */
          write_ID(adder, SRC1_OCR_A, EXT_NONE | INT_M1_M2  | NO_ID | WAIT);
          write_ID(adder, SRC2_OCR_A, EXT_NONE | INT_SOURCE | NO_ID | NO_WAIT);
          write_ID(adder, DST_OCR_A, EXT_NONE | INT_NONE   | NO_ID | NO_WAIT);
          write_ID(adder, SRC1_OCR_B, EXT_NONE | INT_SOURCE | NO_ID | WAIT);
          write_ID(adder, SRC2_OCR_B, EXT_NONE | INT_M1_M2  | NO_ID | NO_WAIT);
          write_ID(adder, DST_OCR_B, EXT_NONE | INT_NONE | NO_ID | NO_WAIT);
          /*
          * init Logic Unit Function registers, (these are just common values,
          * and may be changed as required).
          */
          write_ID(adder, LU_FUNCTION_R1, FULL_SRC_RESOLUTION | LF_SOURCE);
          write_ID(adder, LU_FUNCTION_R2, FULL_SRC_RESOLUTION | LF_SOURCE |
                   INV_M1_M2);
          write_ID(adder, LU_FUNCTION_R3, FULL_SRC_RESOLUTION | LF_D_OR_S);
          write_ID(adder, LU_FUNCTION_R4, FULL_SRC_RESOLUTION | LF_D_XOR_S);
          /*
          * load the color map for black & white
          */
          for (i = 0, adder->status = 0; i < 10000 && !(adder->status&VSYNC); ++i)
                  ;
  
          if (i == 0)
                  printf("qd%d: setup_dragon: timeout on VSYNC\n", unit);
  
          red = (short *) qdmap[unit].red;
          green = (short *) qdmap[unit].green;
          blue = (short *) qdmap[unit].blue;
  
          *red++ = 0x00;                  /* black */
          *green++ = 0x00;
          *blue++ = 0x00;
  
          *red-- = 0xFF;                  /* white */
          *green-- = 0xFF;
          *blue-- = 0xFF;
  
          /*
          * set color map for mouse cursor
          */
  
          red += 254;
          green += 254;
          blue += 254;
  
          *red++ = 0x00;                  /* black */
          *green++ = 0x00;
          *blue++ = 0x00;
  
          *red = 0xFF;                    /* white */
          *green = 0xFF;
          *blue = 0xFF;
  
  } /* setup_dragon */
  
  /*
   * Init the DUART and set defaults in input
   */
  void
  setup_input(unit)
          int unit;
  {
          volatile struct duart *duart;   /* DUART register structure pointer */
          int i, bits;
          char id_byte;
  
          duart = (struct duart *) qdmap[unit].duart;
          duart->imask = 0;
  
          /*
          * setup the DUART for kbd & pointing device
          */
          duart->cmdA = RESET_M;  /* reset mode reg ptr for kbd */
          duart->modeA = 0x13;    /* 8 bits, no parity, rcv IE, */
                                  /* no RTS control,char error mode */
          duart->modeA = 0x07;    /* 1 stop bit,CTS does not IE XMT */
                                  /* no RTS control,no echo or loop */
          duart->cmdB = RESET_M;  /* reset mode reg pntr for host */
          duart->modeB = 0x07;    /* 8 bits, odd parity, rcv IE.. */
                                  /* ..no RTS cntrl, char error mode */
          duart->modeB = 0x07;    /* 1 stop bit,CTS does not IE XMT */
                                  /* no RTS control,no echo or loop */
          duart->auxctl = 0x00;   /* baud rate set 1 */
          duart->clkselA = 0x99;  /* 4800 baud for kbd */
          duart->clkselB = 0x99;  /* 4800 baud for mouse */
  
          /* reset everything for keyboard */
  
          for (bits = RESET_M; bits < START_BREAK; bits += 0x10)
                  duart->cmdA = bits;
  
          /* reset everything for host */
  
          for (bits = RESET_M; bits < START_BREAK; bits += 0x10)
                  duart->cmdB = bits;
  
          duart->cmdA = EN_RCV | EN_XMT; /* enbl xmt & rcv for kbd */
          duart->cmdB = EN_RCV | EN_XMT; /* enbl xmt & rcv for pointer device */
  
          /*
          * init keyboard defaults (DUART channel A)
          */
          for (i = 500; i > 0; --i) {
                  if (duart->statusA&XMT_RDY) {
                          duart->dataA = LK_DEFAULTS;
                          break;
                  }
          }
  
          for (i = 100000; i > 0; --i) {
                  if (duart->statusA&RCV_RDY) {
                          break;
                  }
          }
  
          if (duart->dataA)       /* flush the ACK */
                  ;
  
          /*
          * identify the pointing device
          */
          for (i = 500; i > 0; --i) {
                  if (duart->statusB&XMT_RDY) {
                          duart->dataB = SELF_TEST;
                          break;
                  }
          }
  
          /*
          * wait for 1st byte of self test report */
  
          for (i = 100000; i > 0; --i) {
                  if (duart->statusB&RCV_RDY) {
                          break;
                  }
          }
  
          if (i == 0) {
                  printf("qd[%d]: setup_input: timeout on 1st byte of self test\n"
                      ,unit);
                  goto OUT;
          }
  
          if (duart->dataB)
                  ;
  
          /*
          * wait for ID byte of self test report
          */
          for (i = 100000; i > 0; --i) {
                  if (duart->statusB&RCV_RDY) {
                          break;
                  }
          }
  
          if (i == 0) {
                  printf("qd[%d]: setup_input: timeout on 2nd byte of self test\n", unit);
                  goto OUT;
          }
  
          id_byte = duart->dataB;
  
          /*
          * wait for other bytes to come in
          */
          for (i = 100000; i > 0; --i) {
                  if (duart->statusB & RCV_RDY) {
                          if (duart->dataB)
                                  ;
                          break;
                  }
          }
          if (i == 0) {
                  printf("qd[%d]: setup_input: timeout on 3rd byte of self test\n", unit);
                  goto OUT;
          }
          for (i = 100000; i > 0; --i) {
                  if (duart->statusB&RCV_RDY) {
                          if (duart->dataB)
                                  ;
                          break;
                  }
          }
          if (i == 0) {
                  printf("qd[%d]: setup_input: timeout on 4th byte of self test\n", unit);
                  goto OUT;
          }
          /*
          * flag pointing device type and set defaults
          */
          for (i=100000; i>0; --i)
                  ;               /*XXX*/
  
          if ((id_byte & 0x0F) != TABLET_ID) {
                  qdflags[unit].pntr_id = MOUSE_ID;
  
                  for (i = 500; i > 0; --i) {
                          if (duart->statusB&XMT_RDY) {
                                  duart->dataB = INC_STREAM_MODE;
                                  break;
                          }
                  }
          }
          else {
                  qdflags[unit].pntr_id = TABLET_ID;
  
                  for (i = 500; i > 0; --i) {
                          if (duart->statusB&XMT_RDY) {
                                  duart->dataB = T_STREAM;
                                  break;
                          }
                  }
          }
  OUT:
          duart->imask = qdflags[unit].duart_imask;
  
  } /* setup_input */
  
  /*
   * delay for at least one display frame time
   *
   *      return: BAD means that we timed out without ever seeing the
   *                    vertical sync status bit
   *              GOOD otherwise
   */
  int
  wait_status(adder, mask)
          volatile struct adder *adder;
          int mask;
  {
          int i;
  
          for (i = 10000, adder->status = 0 ; i > 0  &&
               !(adder->status&mask) ; --i)
                  ;
  
          if (i == 0) {
                  printf("wait_status: timeout polling for 0x%x in adder->status\n", mask);
                  return(BAD);
          }
  
          return(GOOD);
  
  } /* wait_status */
  
  /*
   * write out onto the ID bus
   */
  void
  write_ID(adder, adrs, data)
          volatile struct adder *adder;
          short adrs;
          short data;
  {
          int i;
  
          for (i = 100000, adder->status = 0 ;
                i > 0  &&  !(adder->status&ADDRESS_COMPLETE) ; --i)
                  ;
  
          if (i == 0)
                  goto ERR;
  
          for (i = 100000, adder->status = 0 ;
                i > 0  &&  !(adder->status&TX_READY) ; --i)
                  ;
  
          if (i > 0) {
                  adder->id_data = data;
                  adder->command = ID_LOAD | adrs;
                  return ;
          }
  
  ERR:
          printf("write_ID: timeout trying to write to VIPER\n");
          return ;
  
  } /* write_ID */