File:  [DragonFly] / src / sys / dev / video / pcvt / i386 / Attic / pcvt_drv.c
Revision 1.10: download - view: text, annotated - select for diffs
Wed May 19 22:52:54 2004 UTC (9 years, 11 months ago) by dillon
Branches: MAIN
CVS tags: HEAD, DragonFly_Snap13Sep2004, DragonFly_1_0_REL, DragonFly_1_0_RC1, DragonFly_1_0A_REL
Device layer rollup commit.

* cdevsw_add() is now required.  cdevsw_add() and cdevsw_remove() may specify
  a mask/match indicating the range of supported minor numbers.  Multiple
  cdevsw_add()'s using the same major number, but distinctly different
  ranges, may be issued.  All devices that failed to call cdevsw_add() before
  now do.

* cdevsw_remove() now automatically marks all devices within its supported
  range as being destroyed.

* vnode->v_rdev is no longer resolved when the vnode is created.  Instead,
  only v_udev (a newly added field) is resolved.  v_rdev is resolved when
  the vnode is opened and cleared on the last close.

* A great deal of code was making rather dubious assumptions with regards
  to the validity of devices associated with vnodes, primarily due to
  the persistence of a device structure due to being indexed by (major, minor)
  instead of by (cdevsw, major, minor).  In particular, if you run a program
  which connects to a USB device and then you pull the USB device and plug
  it back in, the vnode subsystem will continue to believe that the device
  is open when, in fact, it isn't (because it was destroyed and recreated).

  In particular, note that all the VFS mount procedures now check devices
  via v_udev instead of v_rdev prior to calling VOP_OPEN(), since v_rdev
  is NULL prior to the first open.

* The disk layer's device interaction has been rewritten.  The disk layer
  (i.e. the slice and disklabel management layer) no longer overloads
  its data onto the device structure representing the underlying physical
  disk.  Instead, the disk layer uses the new cdevsw_add() functionality
  to register its own cdevsw using the underlying device's major number,
  and simply does NOT register the underlying device's cdevsw.  No
  confusion is created because the device hash is now based on
  (cdevsw,major,minor) rather then (major,minor).

  NOTE: This also means that underlying raw disk devices may use the entire
  device minor number instead of having to reserve the bits used by the disk
  layer, and also means that can we (theoretically) stack a fully
  disklabel-supported 'disk' on top of any block device.

* The new reference counting scheme prevents this by associating a device
  with a cdevsw and disconnecting the device from its cdevsw when the cdevsw
  is removed.  Additionally, all udev2dev() lookups run through the cdevsw
  mask/match and only successfully find devices still associated with an
  active cdevsw.

* Major work on MFS:  MFS no longer shortcuts vnode and device creation.  It
  now creates a real vnode and a real device and implements real open and
  close VOPs.  Additionally, due to the disk layer changes, MFS is no longer
  limited to 255 mounts.  The new limit is 16 million.  Since MFS creates a
  real device node, mount_mfs will now create a real /dev/mfs<PID> device
  that can be read from userland (e.g. so you can dump an MFS filesystem).

* BUF AND DEVICE STRATEGY changes.  The struct buf contains a b_dev field.
  In order to properly handle stacked devices we now require that the b_dev
  field be initialized before the device strategy routine is called.  This
  required some additional work in various VFS implementations.  To enforce
  this requirement, biodone() now sets b_dev to NODEV.  The new disk layer
  will adjust b_dev before forwarding a request to the actual physical
  device.

* A bug in the ISO CD boot sequence which resulted in a panic has been fixed.

Testing by: lots of people, but David Rhodus found the most aggregious bugs.

/*
 * Copyright (c) 1999 Hellmuth Michaelis
 *
 * Copyright (c) 1992, 1995 Hellmuth Michaelis and Joerg Wunsch.
 *
 * Copyright (c) 1992, 1993 Brian Dunford-Shore and Scott Turner.
 *
 * Copyright (c) 1993 Charles Hannum.
 *
 * All rights reserved.
 *
 * Parts of this code regarding the NetBSD interface were written
 * by Charles Hannum.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz and Don Ahn.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by
 *	Hellmuth Michaelis, Brian Dunford-Shore, Joerg Wunsch, Scott Turner
 *	and Charles Hannum.
 * 4. The name authors may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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.
 */

/*---------------------------------------------------------------------------*
 *
 *	pcvt_drv.c	VT220 Driver Main Module / OS - Interface
 *	---------------------------------------------------------
 *
 *	Last Edit-Date: [Mon Dec 27 14:03:36 1999]
 *
 * $FreeBSD: src/sys/i386/isa/pcvt/pcvt_drv.c,v 1.63.2.1 2001/02/26 04:23:13 jlemon Exp $
 * $DragonFly: src/sys/dev/video/pcvt/i386/pcvt_drv.c,v 1.10 2004/05/19 22:52:54 dillon Exp $
 *
 *---------------------------------------------------------------------------*/

#include "use_vt.h"
#if NVT > 0

#define EXTERN			/* allocate mem */

#include "pcvt_hdr.h"	/* global include */

#if PCVT_FREEBSD >= 200
#include <sys/bus.h>
#include <machine/stdarg.h>
#else
#include "machine/stdarg.h"
#endif

extern int getchar (void);

#if PCVT_NETBSD
	extern u_short *Crtat;
#endif /* PCVT_NETBSD */

static void vgapelinit(void);	/* read initial VGA DAC palette */

#if defined XSERVER && !PCVT_USL_VT_COMPAT
static int pcvt_xmode_set(int on, struct thread *td); /* initialize for X mode */
#endif /* XSERVER && !PCVT_USL_VT_COMPAT */

#ifdef _DEV_KBD_KBDREG_H_
static void detect_kbd(void *arg);
static kbd_callback_func_t pcevent;
#endif

static cn_probe_t	pccnprobe;
static cn_init_t	pccninit;
static cn_term_t	pccnterm;
static cn_getc_t	pccngetc;
static cn_checkc_t	pccncheckc;
static cn_putc_t	pccnputc;

CONS_DRIVER(pc, pccnprobe, pccninit, pccnterm, pccngetc, pccncheckc, pccnputc,
	    NULL);

static	d_open_t	pcopen;
static	d_close_t	pcclose;
static	d_ioctl_t	pcioctl;
static	d_mmap_t	pcmmap;

#define	CDEV_MAJOR	12
struct cdevsw pc_cdevsw = {
	/* name */	"vt",
	/* maj */	CDEV_MAJOR,
	/* flags */	D_TTY | D_KQFILTER,
	/* port */	NULL,
	/* clone */	NULL,

	/* open */	pcopen,
	/* close */	pcclose,
	/* read */	ttyread,
	/* write */	ttywrite,
	/* ioctl */	pcioctl,
	/* poll */	ttypoll,
	/* mmap */	pcmmap,
	/* strategy */	nostrategy,
	/* dump */	nodump,
	/* psize */	nopsize,
	/* kqfilter */	ttykqfilter
};

#if PCVT_NETBSD > 100	/* NetBSD-current Feb 20 1995 */
int
pcprobe(struct device *parent, void *match, void *aux)
#else
#if PCVT_NETBSD > 9
int
pcprobe(struct device *parent, struct device *self, void *aux)
#else
int
pcprobe(struct isa_device *dev)
#endif /* PCVT_NETBSD > 9 */
#endif /* PCVT_NETBSD > 100 */
{
#ifdef _DEV_KBD_KBDREG_H_
	int i;

	if (kbd == NULL) {
		reset_keyboard = 0;
		kbd_configure(KB_CONF_PROBE_ONLY);
		i = kbd_allocate("*", -1, (void *)&kbd, pcevent, (void *)dev->id_unit);
		if ((i < 0) || ((kbd = kbd_get_keyboard(i)) == NULL))
			return (-1);
	}
	reset_keyboard = 1;		/* it's now safe to do kbd reset */
#endif /* _DEV_KBD_KBDREG_H_ */

	kbd_code_init();

#if PCVT_NETBSD > 9
	((struct isa_attach_args *)aux)->ia_iosize = 16;
	return 1;
#else
#ifdef _DEV_KBD_KBDREG_H_
	return (-1);
#elif PCVT_NETBSD || PCVT_FREEBSD
	return (16);
#else
	return 1;
#endif /* PCVT_NETBSD || PCVT_FREEBSD */
#endif /* PCVT_NETBSD > 9 */

}

#if PCVT_NETBSD > 9
void
pcattach(struct device *parent, struct device *self, void *aux)
{
	struct isa_attach_args *ia = aux;
	static struct intrhand vthand;
#else
int
pcattach(struct isa_device *dev)
{
#endif /* PCVT_NETBSD > 9 */

	int i;

	vt_coldmalloc();		/* allocate memory for screens */

#ifdef _DEV_KBD_KBDREG_H_
	if (kbd == NULL)
		timeout(detect_kbd, (void *)dev->id_unit, hz*2);
#endif /* _DEV_KBD_KBDREG_H_ */

#if PCVT_NETBSD || PCVT_FREEBSD

#if PCVT_NETBSD > 9
	printf(": ");
#else
	printf("vt%d: ", dev->id_unit);
#endif /* PCVT_NETBSD > 9 */

	switch(adaptor_type)
	{
		case MDA_ADAPTOR:
			printf("mda");
			break;

		case CGA_ADAPTOR:
			printf("cga");
			break;

		case EGA_ADAPTOR:
			printf("ega");
			break;

		case VGA_ADAPTOR:
			printf("%s, ", (char *)vga_string(vga_type));
			if(can_do_132col)
				printf("80/132 col");
			else
				printf("80 col");
			vgapelinit();
			break;

		default:
			printf("unknown");
			break;
	}

	if(color == 0)
		printf(", mono");
	else
		printf(", color");

	printf(", %d scr, ", totalscreens);

	switch(keyboard_type)
	{
		case KB_AT:
			printf("at-");
			break;

		case KB_MFII:
			printf("mf2-");
			break;

		default:
			printf("unknown ");
			break;
	}

	printf("kbd, [R%s]\n", PCVT_REL);

#if PCVT_NETBSD || (PCVT_FREEBSD > 110 && PCVT_FREEBSD < 200)

	for(i = 0; i < totalscreens; i++)
	{

#if PCVT_NETBSD
		pc_tty[i] = ttymalloc();
		vs[i].vs_tty = pc_tty[i];
#else /* !PCVT_NETBSD */
		pccons[i] = ttymalloc(pccons[i]);
		vs[i].vs_tty = pccons[i];
#endif /* PCVT_NETBSD */

	}

#if PCVT_EMU_MOUSE
#if PCVT_NETBSD
	pc_tty[totalscreens] = ttymalloc(); /* the mouse emulator tty */
#else /* !PCVT_NETBSD */
	/* the mouse emulator tty */
	pc_tty[totalscreens] = ttymalloc(pccons[totalscreens]);
#endif /* PCVT_NETBSD */
#endif /* PCVT_EMU_MOUSE */

#if PCVT_NETBSD
	pcconsp = pc_tty[0];
#else  /* !PCVT_NETBSD */
	pcconsp = pccons[0];
#endif  /* PCVT_NETBSD */

#endif /* #if PCVT_NETBSD || (PCVT_FREEBSD > 110 && PCVT_FREEBSD < 200) */

#else /* !PCVT_NETBSD && !PCVT_FREEBSD*/

	switch(adaptor_type)
	{
		case MDA_ADAPTOR:
			printf(" <mda");
			break;

		case CGA_ADAPTOR:
			printf(" <cga");
			break;

		case EGA_ADAPTOR:
			printf(" <ega");
			break;

		case VGA_ADAPTOR:
			printf(" <%s,", (char *)vga_string(vga_type));
			if(can_do_132col)
				printf("80/132 col");
			else
				printf("80 col");
			vgapelinit();
			break;

		default:
			printf(" <unknown");
			break;
	}

	if(color == 0)
		printf(",mono");
	else
		printf(",color");

	printf(",%d scr,", totalscreens);

	switch(keyboard_type)
	{
		case KB_AT:
			printf("at-");
			break;

		case KB_MFII:
			printf("mf2-");
			break;

		default:
			printf("unknown ");
			break;
	}

	printf("kbd,[R%s]>", PCVT_REL);

#endif  /* PCVT_NETBSD || PCVT_FREEBSD */

#if !PCVT_NETBSD && !(PCVT_FREEBSD > 110 && PCVT_FREEBSD < 200)
	cdevsw_add(&pc_cdevsw, 0, 0);
	for(i = 0; i < totalscreens; i++)
	{
		ttyregister(&pccons[i]);
		vs[i].vs_tty = &pccons[i];
		make_dev(&pc_cdevsw, i, UID_ROOT, GID_WHEEL, 0600, "ttyv%r", i);
	}
#endif /* !PCVT_NETBSD && !(PCVT_FREEBSD > 110 && PCVT_FREEBSD < 200) */

	async_update(UPDATE_START);	/* start asynchronous updates */

#if PCVT_NETBSD > 9

	vthand.ih_fun = pcrint;
	vthand.ih_arg = 0;
	vthand.ih_level = IPL_TTY;

#if (PCVT_NETBSD > 100) && defined(IST_EDGE)
	intr_establish(ia->ia_irq, IST_EDGE, &vthand);
#else /* PCVT_NETBSD > 100 */
	intr_establish(ia->ia_irq, &vthand);
#endif /* PCVT_NETBSD > 100 */

#else /* PCVT_NETBSD > 9 */

	dev->id_ointr = pcrint;

	return 1;

#endif /* PCVT_NETBSD > 9 */

}

/* had a look at the friedl driver */

#if !PCVT_NETBSD

struct tty *
get_pccons(Dev_t dev)
{
	int i = minor(dev);

#if PCVT_EMU_MOUSE
 	if(i == totalscreens)
#if !(PCVT_FREEBSD > 110 && PCVT_FREEBSD < 200)
 		return(&pccons[i]);
#else
 		return(pccons[i]);
#endif /* !(PCVT_FREEBSD > 110 && PCVT_FREEBSD < 200) */
#endif /* PCVT_EMU_MOUSE */

	if(i >= PCVT_NSCREENS)
		return(NULL);
#if !(PCVT_FREEBSD > 110 && PCVT_FREEBSD < 200)
	return(&pccons[i]);
#else
	return(pccons[i]);
#endif
}

#else

struct tty *
get_pccons(Dev_t dev)
{
	int i = minor(dev);

#if PCVT_EMU_MOUSE
	if(i == totalscreens)
		return(pc_tty[i]);
#endif /* PCVT_EMU_MOUSE */

	if(i >= PCVT_NSCREENS)
		return(NULL);
	return(pc_tty[i]);
}

#endif /* !PCVT_NETBSD */

/*---------------------------------------------------------------------------*
 *		/dev/ttyc0, /dev/ttyc1, etc.
 *---------------------------------------------------------------------------*/
int
pcopen(Dev_t dev, int flag, int mode, struct thread *td)
{
	struct tty *tp;
	struct video_state *vsx;
	int s, retval;
	int winsz = 0;
	int i = minor(dev);

#if PCVT_EMU_MOUSE
	if(i == totalscreens)
		vsx = 0;
	else
#endif /* PCVT_EMU_MOUSE */

	vsx = &vs[i];

  	if((tp = get_pccons(dev)) == NULL)
		return ENXIO;

	dev->si_tty = tp;

#if PCVT_EMU_MOUSE
	if(i == totalscreens)
	{
		if(mouse.opened == 0)
			mouse.buttons = mouse.extendedseen =
				mouse.breakseen = mouse.lastmove.tv_sec = 0;
		mouse.minor = i;
		mouse.opened++;
	}
	else
#endif /* PCVT_EMU_MOUSE */

	vsx->openf++;

	tp->t_oproc = pcstart;
	tp->t_param = pcparam;
	tp->t_stop = nottystop;
	tp->t_dev = dev;

	if ((tp->t_state & TS_ISOPEN) == 0)
	{

#ifdef TS_WOPEN /* not (FreeBSD-1.1.5 or FreeBSD some time after 2.0.5) */
		tp->t_state |= TS_WOPEN;
#endif

		ttychars(tp);
		tp->t_iflag = TTYDEF_IFLAG;
		tp->t_oflag = TTYDEF_OFLAG;
		tp->t_cflag = TTYDEF_CFLAG;
		tp->t_lflag = TTYDEF_LFLAG;
		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
		pcparam(tp, &tp->t_termios);
		(*linesw[tp->t_line].l_modem)(tp, 1);	/* fake connection */
		winsz = 1;			/* set winsize later */
	}
	else if (tp->t_state & TS_XCLUDE && suser(td))
		return (EBUSY);

#if PCVT_NETBSD || (PCVT_FREEBSD >= 200)
	retval = ((*linesw[tp->t_line].l_open)(dev, tp));
#else
	retval = ((*linesw[tp->t_line].l_open)(dev, tp, flag));
#endif /* PCVT_NETBSD || (PCVT_FREEBSD >= 200) */

	if(winsz == 1)
	{

		/*
		 * The line discipline has clobbered t_winsize if TS_ISOPEN
	         * was clear. (NetBSD PR #400 from Bill Sommerfeld)
	         * We have to do this after calling the open routine, because
	         * it does some other things in other/older *BSD releases -hm
		 */

		s = spltty();

		tp->t_winsize.ws_col = vsx->maxcol;
		tp->t_winsize.ws_row = vsx->screen_rows;
		tp->t_winsize.ws_xpixel = (vsx->maxcol == 80)? 720: 1056;
		tp->t_winsize.ws_ypixel = 400;

		splx(s);
	}

	return(retval);
}

int
pcclose(Dev_t dev, int flag, int mode, struct thread *td)
{
	struct tty *tp;
	struct video_state *vsx;
	int i = minor(dev);

#if PCVT_EMU_MOUSE
	if(i == totalscreens)
		vsx = 0;
	else
#endif /* PCVT_EMU_MOUSE */

	vsx = &vs[i];

	if((tp = get_pccons(dev)) == NULL)
		return ENXIO;

	(*linesw[tp->t_line].l_close)(tp, flag);
	ttyclose(tp);

#if PCVT_EMU_MOUSE
	if(i == totalscreens)
		mouse.opened = 0;
	else
#endif /* PCVT_EMU_MOUSE */

	vsx->openf = 0;

#if PCVT_USL_VT_COMPAT
#if PCVT_EMU_MOUSE

	if(i == totalscreens)
		return (0);

#endif /* PCVT_EMU_MOUSE */

	reset_usl_modes(vsx);

#endif /* PCVT_USL_VT_COMPAT */

	return(0);
}

int
pcioctl(Dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
{
	int error;
	struct tty *tp;

	if((tp = get_pccons(dev)) == NULL)
		return(ENXIO);

	/* note that some ioctl's are global, e.g.  KBSTPMAT: There is
	 * only one keyboard and different repeat rates for instance between
	 * sessions are a suspicious wish. If you really need this make the
	 * appropriate variables arrays
	 */

#if PCVT_EMU_MOUSE
	if(minor(dev) == totalscreens)
	{
		if((error = mouse_ioctl(dev, cmd, data)) >= 0)
			return error;
		goto do_standard;
	}
#endif /* PCVT_EMU_MOUSE */

#ifdef XSERVER
#if PCVT_USL_VT_COMPAT

	if((error = usl_vt_ioctl(dev, cmd, data, flag, td->td_proc)) >= 0)
		return error;

	/*
	 * just for compatibility:
	 * XFree86 < 2.0 and SuperProbe still might use it
	 *
	 * NB: THIS IS A HACK! Do not use it unless you explicitly need.
	 * Especially, since the vty is not put into process-controlled
	 * mode (this would require the application to co-operate), any
	 * attempts to switch vtys while this kind of X mode is active
	 * may cause serious trouble.
	 */
	switch(cmd)
	{
	  case CONSOLE_X_MODE_ON:
	  {
	    int i;

	    if((error = usl_vt_ioctl(dev, KDENABIO, 0, flag, td->td_proc)) > 0)
	      return error;

	    i = KD_GRAPHICS;
	    if((error = usl_vt_ioctl(dev, KDSETMODE, (caddr_t)&i, flag, td->td_proc))
	       > 0)
	      return error;

	    i = K_RAW;
	    error = usl_vt_ioctl(dev, KDSKBMODE, (caddr_t)&i, flag, td->td_proc);
	    return error;
	  }

	  case CONSOLE_X_MODE_OFF:
	  {
	    int i;

	    (void)usl_vt_ioctl(dev, KDDISABIO, 0, flag, td->td_proc);

	    i = KD_TEXT;
	    (void)usl_vt_ioctl(dev, KDSETMODE, (caddr_t)&i, flag, td->td_proc);

	    i = K_XLATE;
	    (void)usl_vt_ioctl(dev, KDSKBMODE, (caddr_t)&i, flag, td->td_proc);
	    return 0;
	  }


	  case CONSOLE_X_BELL:

		/*
		 * If `data' is non-null, the first int value denotes
		 * the pitch, the second a duration. Otherwise, behaves
		 * like BEL.
		 */

		if (data)
		{

#if PCVT_NETBSD
			sysbeep(((int *)data)[0],
				((int *)data)[1] * hz / 1000);
#else /* PCVT_NETBSD */
			sysbeep(PCVT_SYSBEEPF / ((int *)data)[0],
				((int *)data)[1] * hz / 3000);
#endif /* PCVT_NETBSD */

		}
		else
		{
			sysbeep(PCVT_SYSBEEPF / 1493, hz / 4);
		}
		return (0);

	  default: /* fall through */ ;
	}

#else /* PCVT_USL_VT_COMPAT */

	switch(cmd)
	{
	  case CONSOLE_X_MODE_ON:
		return pcvt_xmode_set(1, td->td_proc);

	  case CONSOLE_X_MODE_OFF:
		return pcvt_xmode_set(0, td->td_proc);

	  case CONSOLE_X_BELL:

		/*
		 * If `data' is non-null, the first int value denotes
		 * the pitch, the second a duration. Otherwise, behaves
		 * like BEL.
		 */

		if (data)
		{

#if PCVT_NETBSD
			sysbeep(((int *)data)[0],
				((int *)data)[1] * hz / 1000);
#else /* PCVT_NETBSD */
			sysbeep(PCVT_SYSBEEPF / ((int *)data)[0],
				((int *)data)[1] * hz / 3000);
#endif /* PCVT_NETBSD */

		}
		else
		{
			sysbeep(PCVT_SYSBEEPF / 1493, hz / 4);
		}
		return (0);

	  default: /* fall through */ ;
	}

#endif /* PCVT_USL_VT_COMPAT */
#endif /* XSERVER */

	if((error = kbdioctl(dev,cmd,data,flag)) >= 0)
		return error;

	if((error = vgaioctl(dev,cmd,data,flag)) >= 0)
		return error;

#if PCVT_EMU_MOUSE
do_standard:
#endif

#if PCVT_NETBSD > 9 || PCVT_FREEBSD >= 200
	if((error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td))
	    != ENOIOCTL)
		return (error);
#else
	if((error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag)) >= 0)
		return(error);
#endif /* PCVT_NETBSD > 9 || PCVT_FREEBSD >= 200 */

#if PCVT_NETBSD > 9
	if((error = ttioctl(tp, cmd, data, flag, td)) >= 0)
		return (error);
#else
	if((error = ttioctl(tp, cmd, data, flag)) != ENOIOCTL)
		return (error);
#endif /* PCVT_NETBSD > 9 */

	return (ENOTTY);
}

int
pcmmap(Dev_t dev, vm_offset_t offset, int nprot)
{
	if (offset > 0x20000 - PAGE_SIZE)
		return -1;
	return i386_btop((0xa0000 + offset));
}

/*---------------------------------------------------------------------------*
 *
 *	handle a keyboard receive interrupt
 *
 *	NOTE: the keyboard is multiplexed by means of "pcconsp"
 *	between virtual screens. pcconsp - switching is done in
 *	the vgapage() routine
 *
 *---------------------------------------------------------------------------*/

#if PCVT_KBD_FIFO

u_char pcvt_kbd_fifo[PCVT_KBD_FIFO_SZ];
static int pcvt_kbd_wptr = 0;
int pcvt_kbd_rptr = 0;
short pcvt_kbd_count= 0;
static u_char pcvt_timeout_scheduled = 0;

static void
pcvt_timeout(void *arg)
{
	u_char *cp;

#if PCVT_SLOW_INTERRUPT
	int	s;
#endif

	pcvt_timeout_scheduled = 0;

#if PCVT_SCREENSAVER
	pcvt_scrnsv_reset();
#endif /* PCVT_SCREENSAVER */

	while (pcvt_kbd_count)
	{
		if (((cp = sgetc(1)) != 0) &&
		    (vs[current_video_screen].openf))
		{

#if PCVT_NULLCHARS
			if(*cp == '\0')
			{
				/* pass a NULL character */
				(*linesw[pcconsp->t_line].l_rint)('\0', pcconsp);
			}
/* XXX */		else
#endif /* PCVT_NULLCHARS */

			while (*cp)
				(*linesw[pcconsp->t_line].l_rint)(*cp++ & 0xff, pcconsp);
		}

		PCVT_DISABLE_INTR ();

		if (!pcvt_kbd_count)
			pcvt_timeout_scheduled = 0;

		PCVT_ENABLE_INTR ();
	}

	return;
}
#endif

#ifdef _DEV_KBD_KBDREG_H_
static void
detect_kbd(void *arg)
{
	int unit = (int)arg;
	int i;

	if (kbd != NULL)
		return;
	i = kbd_allocate("*", -1, (void *)&kbd, pcevent, (void *)unit);
	if (i >= 0)
		kbd = kbd_get_keyboard(i);
	if (kbd != NULL)
	{
		reset_keyboard = 1;	/* ok to reset the keyboard */
		kbd_code_init();
		return;
	}
	reset_keyboard = 0;
	timeout(detect_kbd, (void *)unit, hz*2);
}

int
pcevent(keyboard_t *thiskbd, int event, void *arg)
{
	int unit = (int)arg;

	if (thiskbd != kbd)
		return EINVAL;		/* shouldn't happen */

	switch (event) {
	case KBDIO_KEYINPUT:
		pcrint(unit);
		return 0;
	case KBDIO_UNLOADING:
		reset_keyboard = 0;
		kbd = NULL;
		kbd_release(thiskbd, (void *)&kbd);
		timeout(detect_kbd, (void *)unit, hz*4);
		return 0;
	default:
		return EINVAL;
	}
}
#endif /* _DEV_KBD_KBDREG_H_ */

void
pcrint(int unit)
{

#if PCVT_KBD_FIFO
	u_char	dt;
	u_char	ret = -1;

# if PCVT_SLOW_INTERRUPT
	int	s;
# endif

# ifdef _DEV_KBD_KBDREG_H_
	int	c;
# endif

#else /* !PCVT_KBD_FIFO */
	u_char	*cp;
#endif /* PCVT_KBD_FIFO */

#if PCVT_SCREENSAVER
	pcvt_scrnsv_reset();
#endif /* PCVT_SCREENSAVER */

#if PCVT_KBD_FIFO
	if (kbd_polling)
	{
		sgetc(1);
		return;
	}

# ifndef _DEV_KBD_KBDREG_H_
	while (inb(CONTROLLER_CTRL) & STATUS_OUTPBF)	/* check 8042 buffer */
	{
		ret = 1;				/* got something */

		PCVT_KBD_DELAY();			/* 7 us delay */

		dt = inb(CONTROLLER_DATA);		/* get it 8042 data */
# else 
	while ((c = (*kbdsw[kbd->kb_index]->read)(kbd, FALSE)) != -1)
	{
		ret = 1;				/* got something */
		dt = c;
# endif /* _DEV_KBD_KBDREG_H_ */

		if (pcvt_kbd_count >= PCVT_KBD_FIFO_SZ)	/* fifo overflow ? */
		{
			log (LOG_WARNING, "pcvt: keyboard buffer overflow\n");
		}
		else
		{
			pcvt_kbd_fifo[pcvt_kbd_wptr++] = dt; /* data -> fifo */

			PCVT_DISABLE_INTR ();	/* XXX necessary ? */
			pcvt_kbd_count++;		/* update fifo count */
			PCVT_ENABLE_INTR ();

			if (pcvt_kbd_wptr >= PCVT_KBD_FIFO_SZ)
				pcvt_kbd_wptr = 0;	/* wraparound pointer */
		}
	}

	if (ret == 1)	/* got data from keyboard ? */
	{
		if (!pcvt_timeout_scheduled)	/* if not already active .. */
		{
			PCVT_DISABLE_INTR ();
			pcvt_timeout_scheduled = 1;	/* flag active */
			timeout(pcvt_timeout, NULL, hz / 100);	/* fire off */
			PCVT_ENABLE_INTR ();
		}
	}

#else /* !PCVT_KBD_FIFO */

	if((cp = sgetc(1)) == 0)
		return;

	if (kbd_polling)
		return;

	if(!(vs[current_video_screen].openf))	/* XXX was vs[minor(dev)] */
		return;

#if PCVT_NULLCHARS
	if(*cp == '\0')
	{
		/* pass a NULL character */
		(*linesw[pcconsp->t_line].l_rint)('\0', pcconsp);
		return;
	}
#endif /* PCVT_NULLCHARS */

	while (*cp)
		(*linesw[pcconsp->t_line].l_rint)(*cp++ & 0xff, pcconsp);

#endif /* PCVT_KBD_FIFO */
}


#if PCVT_NETBSD || PCVT_FREEBSD >= 200

void
pcstart(struct tty *tp)
{
	struct clist *rbp;
	int s, len;
	u_char buf[PCVT_PCBURST];

	s = spltty();

	if (tp->t_state & (TS_TIMEOUT|TS_BUSY|TS_TTSTOP))
		goto out;

	tp->t_state |= TS_BUSY;

	splx(s);

	async_update(UPDATE_KERN);

	rbp = &tp->t_outq;

	/*
	 * Call q_to_b() at spltty() to ensure that the queue is empty when
	 * the loop terminates.
	 */

	s = spltty();

	while((len = q_to_b(rbp, buf, PCVT_PCBURST)) > 0)
	{
		if(vs[minor(tp->t_dev)].scrolling)
			sgetc(31337);
		
		/*
		 * We need to do this outside spl since it could be fairly
		 * expensive and we don't want our serial ports to overflow.
		 */
		splx(s);
		sput(&buf[0], 0, len, minor(tp->t_dev));
		s = spltty();
	}

	tp->t_state &= ~TS_BUSY;

#ifndef TS_ASLEEP /* FreeBSD some time after 2.0.5 */
	ttwwakeup(tp);
#else
	if (rbp->c_cc <= tp->t_lowat)
	{
		if (tp->t_state&TS_ASLEEP)
		{
			tp->t_state &= ~TS_ASLEEP;
			wakeup((caddr_t)rbp);
		}
		selwakeup(&tp->t_wsel);
	}
#endif
out:
	splx(s);
}

void
pcstop(struct tty *tp, int flag)
{
}

#else /* PCVT_NETBSD || PCVT_FREEBSD >= 200 */

void
pcstart(struct tty *tp)
{
	int s;
	unsigned char c;

	s = spltty();

	if (tp->t_state & (TS_TIMEOUT|TS_BUSY|TS_TTSTOP))
	{
		goto out;
	}

	for(;;)
	{

#if !(PCVT_FREEBSD > 114)

#if !(PCVT_FREEBSD > 111)
		if (RB_LEN(&tp->t_out) <= tp->t_lowat)
#else
		if (RB_LEN(tp->t_out) <= tp->t_lowat)
#endif
		{
			if (tp->t_state&TS_ASLEEP)
			{
				tp->t_state &= ~TS_ASLEEP;
#if !(PCVT_FREEBSD > 111)
				wakeup((caddr_t)&tp->t_out);
#else
				wakeup((caddr_t)tp->t_out);
#endif
			}

			if (tp->t_wsel)
			{
				selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
				tp->t_wsel = 0;
				tp->t_state &= ~TS_WCOLL;
			}
		}

#else /* PCVT_FREEBSD > 114 */
		if (tp->t_state & (TS_SO_OCOMPLETE | TS_SO_OLOWAT)
		    || tp->t_wsel) {
			ttwwakeup(tp);
		}
#endif /* !PCVT_FREEBSD > 114 */

#if !(PCVT_FREEBSD > 111)
		if (RB_LEN(&tp->t_out) == 0)
#else
		if (RB_LEN(tp->t_out) == 0)
#endif
		{
			goto out;
		}

#if !(PCVT_FREEBSD > 111)
		c = getc(&tp->t_out);
#else
		c = getc(tp->t_out);
#endif

		tp->t_state |= TS_BUSY;	/* patch from Frank Maclachlan */
		splx(s);
		sput(&c, 0, 1, minor(tp->t_dev));
		spltty();
		tp->t_state &= ~TS_BUSY; /* patch from Frank Maclachlan */
	}
out:
	splx(s);
}

#endif /* PCVT_NETBSD || PCVT_FREEBSD >= 200 */

/*---------------------------------------------------------------------------*
 *		/dev/console
 *---------------------------------------------------------------------------*/

#if !PCVT_NETBSD	/* has moved to cons.c in netbsd-current */
void
consinit()		/* init for kernel messages during boot */
{
}
#endif /* PCVT_NETBSD */

#if PCVT_FREEBSD > 205
static void
#else
int
#endif
pccnprobe(struct consdev *cp)
{
	int unit = 0;
	int i;

	/* See if this driver is disabled in probe hint. */ 
	if (resource_int_value("vt", unit, "disabled", &i) == 0 && i) {
		cp->cn_pri = CN_DEAD;
		return;
	}

#ifdef _DEV_KBD_KBDREG_H_
	kbd_configure(KB_CONF_PROBE_ONLY);
	if (kbd_find_keyboard("*", unit) < 0)
	{
		cp->cn_pri = CN_DEAD;
		return;
	}
#endif /* _DEV_KBD_KBDREG_H_ */

	/* initialize required fields */

	cp->cn_dev = make_adhoc_dev(&pc_cdevsw, 0);
	cp->cn_pri = CN_INTERNAL;

#if !PCVT_NETBSD

#if !(PCVT_FREEBSD > 110 && PCVT_FREEBSD < 200)
	cp->cn_tp = &pccons[0];
#else
	cp->cn_tp = pccons[0];
#endif /* !(PCVT_FREEBSD > 110 && PCVT_FREEBSD < 200) */

#endif /* !PCVT_NETBSD */

#if PCVT_FREEBSD <= 205
	return 1;
#endif
}

#if PCVT_FREEBSD > 205
static void
#else
int
#endif
pccninit(struct consdev *cp)
{
	int unit = 0;
	int i;

	pcvt_is_console = 1;

#ifdef _DEV_KBD_KBDREG_H_
	/*
	 * Don't reset the keyboard via `kbdio' just yet.
	 * The system clock has not been calibrated...
	 */
	reset_keyboard = 0;

	if (kbd)
	{
		kbd_release(kbd, (void *)&kbd);
		kbd = NULL;
	}
	i = kbd_allocate("*", -1, (void *)&kbd, pcevent, (void *)unit);
	if (i >= 0)
		kbd = kbd_get_keyboard(i);

#if PCVT_SCANSET == 2
	/*
	 * Turn off scancode translation early so that UserConfig 
	 * and DDB can read the keyboard.
	 */
	if (kbd)
	{
		empty_both_buffers(*(KBDC *)kbd->kb_data, 10);
		set_controller_command_byte(*(KBDC *)kbd->kb_data,
					    KBD_TRANSLATION, 0);
	}
#endif /* PCVT_SCANSET == 2 */

#endif /* _DEV_KBD_KBDREG_H_ */

#if PCVT_FREEBSD <= 205
	return 0;
#endif
}

static void
pccnterm(struct consdev *cp)
{
#ifdef _DEV_KBD_KBDREG_H_
	if (kbd)
	{
		kbd_release(kbd, (void *)&kbd);
		kbd = NULL;
	}
#endif /* _DEV_KBD_KBDREG_H_ */
}

#if PCVT_FREEBSD > 205
static void
#else
int
#endif
pccnputc(Dev_t dev, U_char c)
{

#if PCVT_SW0CNOUTP

	if(current_video_screen != 0)
	{

#if !PCVT_USL_VT_COMPAT
		vgapage(0);
#else
		switch_screen(0, 0);
#endif /* !PCVT_USL_VT_COMPAT */

	}

#endif /* PCVT_SW0CNOUTP */

	if (c == '\n')
		sput("\r", 1, 1, 0);

	sput((char *) &c, 1, 1, 0);

 	async_update(UPDATE_KERN);

#if PCVT_FREEBSD <= 205
	return 0;
#endif
}

static int
pccngetc(Dev_t dev)
{
	int s;
	static u_char *cp, cbuf[4]; /* Temp buf for multi-char key sequence. */
	u_char c;

#ifdef XSERVER

#if !PCVT_USL_VT_COMPAT
	if (pcvt_xmode)
		return 0;
#else /* !PCVT_USL_VT_COMPAT */
	if (pcvt_kbd_raw)
		return 0;
#endif /* !PCVT_USL_VT_COMPAT */

#endif /* XSERVER */

	if (cp && *cp)
		/*
		 * We still have a pending key sequence, e.g.
		 * from an arrow key.  Deliver this one first.
		 */
		return (*cp++);

#ifdef _DEV_KBD_KBDREG_H_
	if (kbd == NULL)
		return 0;
#endif	

	s = spltty();		/* block pcrint while we poll */
	kbd_polling = 1;
#ifdef _DEV_KBD_KBDREG_H_
	(*kbdsw[kbd->kb_index]->enable)(kbd);
#endif	
	cp = sgetc(0);
#ifdef _DEV_KBD_KBDREG_H_
	(*kbdsw[kbd->kb_index]->disable)(kbd);
#endif	
	kbd_polling = 0;
	splx(s);
	c = *cp++;
	if (c && *cp) {
		/* Preserve the multi-char sequence for the next call. */
		bcopy(cp, cbuf, 3); /* take care for a trailing '\0' */
		cp = cbuf;
	} else
		cp = 0;

#if ! (PCVT_FREEBSD >= 201)
	/* this belongs to cons.c */
	if (c == '\r')
		c = '\n';
#endif /* ! (PCVT_FREEBSD >= 201) */

	return c;
}

#if PCVT_FREEBSD >= 200
static int
pccncheckc(Dev_t dev)
{
	char *cp;
	int x;

#ifdef _DEV_KBD_KBDREG_H_
	if (kbd == NULL)
		return 0;
#endif	

	x = spltty();
	kbd_polling = 1;
#ifdef _DEV_KBD_KBDREG_H_
	(*kbdsw[kbd->kb_index]->enable)(kbd);
#endif	
	cp = sgetc(1);
#ifdef _DEV_KBD_KBDREG_H_
	(*kbdsw[kbd->kb_index]->disable)(kbd);
#endif	
	kbd_polling = 0;
	splx(x);
	return (cp == NULL ? -1 : *cp);
}
#endif /* PCVT_FREEBSD >= 200 */

#if PCVT_NETBSD >= 100
void
pccnpollc(Dev_t dev, int on)
{
	kbd_polling = on;
	if (!on) {
		int s;

		/*
		 * If disabling polling, make sure there are no bytes left in
		 * the FIFO, holding up the interrupt line.  Otherwise we
		 * won't get any further interrupts.
		 */
		s = spltty();
		pcrint();
		splx(s);
	}
}
#endif /* PCVT_NETBSD >= 100 */

/*---------------------------------------------------------------------------*
 *	Set line parameters
 *---------------------------------------------------------------------------*/
int
pcparam(struct tty *tp, struct termios *t)
{
	int cflag = t->c_cflag;

        /* and copy to tty */

        tp->t_ispeed = t->c_ispeed;
        tp->t_ospeed = t->c_ospeed;
        tp->t_cflag = cflag;

	return(0);
}

/*----------------------------------------------------------------------*
 *	read initial VGA palette (as stored by VGA ROM BIOS) into
 *	palette save area
 *----------------------------------------------------------------------*/
void
vgapelinit(void)
{
	unsigned idx;
	struct rgb *val;

	/* first, read all and store to first screen's save buffer */
	for(idx = 0, val = vs[0].palette; idx < NVGAPEL; idx++, val++)
		vgapaletteio(idx, val, 0 /* read it */);

	/* now, duplicate for remaining screens */
	for(idx = 1; idx < PCVT_NSCREENS; idx++)
		bcopy(vs[0].palette, vs[idx].palette,
		      NVGAPEL * sizeof(struct rgb));
}

#if defined XSERVER && !PCVT_USL_VT_COMPAT
/*----------------------------------------------------------------------*
 *	initialize for X mode
 *	i.e.: grant current process (the X server) all IO privileges,
 *	and mark in static variable so other hooks can test for it,
 *	save all loaded fonts and screen pages to pageable buffers;
 *	if parameter `on' is false, the same procedure is done reverse.
 *----------------------------------------------------------------------*/
static int
pcvt_xmode_set(int on, struct thread *td)
{
	static unsigned char *saved_fonts[NVGAFONTS];

#if PCVT_SCREENSAVER
	static unsigned saved_scrnsv_tmo = 0;
#endif /* PCVT_SCREENSAVER */

#if (PCVT_NETBSD > 9) || (PCVT_FREEBSD > 102)
	struct trapframe *fp;
#else
	struct syscframe *fp;
#endif /* PCVT_NETBSD > 9 */

	int error, i;

	/* X will only run on VGA and Hercules adaptors */

	if(adaptor_type != VGA_ADAPTOR && adaptor_type != MDA_ADAPTOR)
		return (EINVAL);

#if PCVT_NETBSD > 9
	fp = (struct trapframe *)p->p_regs;
#else
	fp = (struct syscframe *)p->p_regs;
#endif /* PCVT_NETBSD > 9 */

	if(on)
	{
		/*
		 * Test whether the calling process has super-user privileges
		 * and we're in insecure mode.
		 * This prevents us from granting the potential security hole
		 * `IO priv' to insufficiently privileged processes.
		 */
		error = suser(td);
		if (error != 0)
			return (error);
		if (securelevel > 0)
			return (EPERM);

		if(pcvt_xmode)
			return 0;

		pcvt_xmode = pcvt_kbd_raw = 1;

		for(i = 0; i < totalfonts; i++)
		{
			if(vgacs[i].loaded)
			{
				saved_fonts[i] = (unsigned char *)
					malloc(32 * 256, M_DEVBUF, M_WAITOK);
				if(saved_fonts[i] == 0)
				{
					printf(
				  "pcvt_xmode_set: no font buffer available\n");
					return (EAGAIN);
				}
				else
				{
					vga_move_charset(i, saved_fonts[i], 1);
				}
			}
			else
			{
				saved_fonts[i] = 0;
			}
		}

#if PCVT_SCREENSAVER
		if(saved_scrnsv_tmo = scrnsv_timeout)
			pcvt_set_scrnsv_tmo(0);	/* turn it off */
#endif /* PCVT_SCREENSAVER */

		async_update(UPDATE_STOP);	/* turn off */

		/* disable text output and save screen contents */
		/* video board memory -> kernel memory */

		bcopy(vsp->Crtat, vsp->Memory,
		       vsp->screen_rowsize * vsp->maxcol * CHR);

		vsp->Crtat = vsp->Memory;	/* operate in memory now */

#ifndef _DEV_KBD_KBDREG_H_

#if PCVT_SCANSET == 2
		/* put keyboard to return ancient PC scan codes */
		kbc_8042cmd(CONTR_WRITE);
#if PCVT_USEKBDSEC		/* security enabled */
		outb(CONTROLLER_DATA,
		 (COMMAND_SYSFLG|COMMAND_IRQEN|COMMAND_PCSCAN));
#else				/* security disabled */
		outb(CONTROLLER_DATA,
		 (COMMAND_INHOVR|COMMAND_SYSFLG|COMMAND_IRQEN|COMMAND_PCSCAN));
#endif /* PCVT_USEKBDSEC */
#endif /* PCVT_SCANSET == 2 */

#else /* _DEV_KBD_KBDREG_H_ */

#if PCVT_SCANSET == 2
		/* put keyboard to return ancient PC scan codes */
		set_controller_command_byte(*(KBDC *)kbd->kb_data, 
			KBD_TRANSLATION, KBD_TRANSLATION); 
#endif /* PCVT_SCANSET == 2 */

#endif /* !_DEV_KBD_KBDREG_H_ */

#if PCVT_NETBSD > 9
		fp->tf_eflags |= PSL_IOPL;
#else
		fp->sf_eflags |= PSL_IOPL;
#endif /* PCVT_NETBSD > 9 */

	}
	else
	{
		if(!pcvt_xmode)		/* verify if in X */
			return 0;

		pcvt_xmode = pcvt_kbd_raw = 0;

		for(i = 0; i < totalfonts; i++)
		{
			if(saved_fonts[i])
			{
				vga_move_charset(i, saved_fonts[i], 0);
				free(saved_fonts[i], M_DEVBUF);
				saved_fonts[i] = 0;
			}
		}

#if PCVT_NETBSD > 9
		fp->tf_eflags &= ~PSL_IOPL;
#else
		fp->sf_eflags &= ~PSL_IOPL;
#endif /* PCVT_NETBSD > 9 */

#if PCVT_SCREENSAVER
		if(saved_scrnsv_tmo)
			pcvt_set_scrnsv_tmo(saved_scrnsv_tmo);
#endif /* PCVT_SCREENSAVER */

#ifndef _DEV_KBD_KBDREG_H_

#if PCVT_SCANSET == 2
		kbc_8042cmd(CONTR_WRITE);
#if PCVT_USEKBDSEC		/* security enabled */
		outb(CONTROLLER_DATA,
		 (COMMAND_SYSFLG|COMMAND_IRQEN));
#else				/* security disabled */
		outb(CONTROLLER_DATA,
		 (COMMAND_INHOVR|COMMAND_SYSFLG|COMMAND_IRQEN));
#endif /* PCVT_USEKBDSEC */
#endif /* PCVT_SCANSET == 2 */

#else /* _DEV_KBD_KBDREG_H_ */

#if PCVT_SCANSET == 2
		set_controller_command_byte(*(KBDC *)kbd->kb_data,
			KBD_TRANSLATION, 0);
#endif /* PCVT_SCANSET == 2 */

#endif /* !_DEV_KBD_KBDREG_H_ */

		if(adaptor_type == MDA_ADAPTOR)
		{
		    /*
		     * Due to the fact that HGC registers are write-only,
		     * the Xserver can only make guesses about the state
		     * the HGC adaptor has been before turning on X mode.
		     * Thus, the display must be re-enabled now, and the
		     * cursor shape and location restored.
		     */
		    outb(GN_DMCNTLM, 0x28); /* enable display, text mode */
		    outb(addr_6845, CRTC_CURSORH); /* select high register */
		    outb(addr_6845+1,
			 ((vsp->Crtat + vsp->cur_offset) - Crtat) >> 8);
		    outb(addr_6845, CRTC_CURSORL); /* select low register */
		    outb(addr_6845+1,
			 ((vsp->Crtat + vsp->cur_offset) - Crtat));

		    outb(addr_6845, CRTC_CURSTART); /* select high register */
		    outb(addr_6845+1, vsp->cursor_start);
		    outb(addr_6845, CRTC_CUREND); /* select low register */
		    outb(addr_6845+1, vsp->cursor_end);
		  }

		/* restore screen and re-enable text output */
		/* kernel memory -> video board memory */

		bcopy(vsp->Memory, Crtat,
		       vsp->screen_rowsize * vsp->maxcol * CHR);

		vsp->Crtat = Crtat;	/* operate on-screen now */

		/* set crtc screen memory start address */

		outb(addr_6845, CRTC_STARTADRH);
		outb(addr_6845+1, (vsp->Crtat - Crtat) >> 8);
		outb(addr_6845, CRTC_STARTADRL);
		outb(addr_6845+1, (vsp->Crtat - Crtat));

		async_update(UPDATE_START);
	}
	return 0;
}
#endif	/* XSERVER && !PCVT_USL_VT_COMPAT */

#endif	/* NVT > 0 */

/*-------------------------- E O F -------------------------------------*/