text: /*-
   * Copyright (c) 1992-1998 Søren Schmidt
   * All rights reserved.
   *
   * This code is derived from software contributed to The DragonFly Project
   * by Sascha Wildner <saw@online.de>
   *
   * 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,
   *    without modification, immediately at the beginning of the file.
   * 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. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR 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.
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD$");
  
  #include "opt_compat.h"
  #include "opt_syscons.h"
  #include "opt_splash.h"
  #include "opt_ddb.h"
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/bus.h>
  #include <sys/conf.h>
  #include <sys/cons.h>
  #include <sys/consio.h>
  #include <sys/kdb.h>
  #include <sys/eventhandler.h>
  #include <sys/fbio.h>
  #include <sys/kbio.h>
  #include <sys/kernel.h>
  #include <sys/lock.h>
  #include <sys/malloc.h>
  #include <sys/mutex.h>
  #include <sys/priv.h>
  #include <sys/proc.h>
  #include <sys/random.h>
  #include <sys/reboot.h>
  #include <sys/serial.h>
  #include <sys/signalvar.h>
  #include <sys/sysctl.h>
  #include <sys/tty.h>
  #include <sys/power.h>
  
  #include <machine/clock.h>
  #if defined(__arm__) || defined(__mips__) || \
  	defined(__powerpc__) || defined(__sparc64__)
  #include <machine/sc_machdep.h>
  #else
  #include <machine/pc/display.h>
  #endif
  #if defined( __i386__) || defined(__amd64__)
  #include <machine/psl.h>
  #include <machine/frame.h>
  #endif
  #include <machine/stdarg.h>
  
  #include <dev/kbd/kbdreg.h>
  #include <dev/fb/fbreg.h>
  #include <dev/fb/splashreg.h>
  #include <dev/syscons/syscons.h>
  
  #define COLD 0
  #define WARM 1
  
  #define DEFAULT_BLANKTIME	(5*60)		/* 5 minutes */
  #define MAX_BLANKTIME		(7*24*60*60)	/* 7 days!? */
  
  #define KEYCODE_BS		0x0e		/* "<-- Backspace" key, XXX */
  
  /* NULL-safe version of "tty_opened()" */
  #define	tty_opened_ns(tp)	((tp) != NULL && tty_opened(tp))
  
  typedef struct default_attr {
  	int		std_color;		/* normal hardware color */
  	int		rev_color;		/* reverse hardware color */
  } default_attr;
  
  static default_attr user_default = {
      SC_NORM_ATTR,
      SC_NORM_REV_ATTR,
  };
  
  static	int		sc_console_unit = -1;
  static	int		sc_saver_keyb_only = 1;
  static  scr_stat    	*sc_console;
  static  struct consdev	*sc_consptr;
  static	scr_stat	main_console;
  static	struct tty 	*main_devs[MAXCONS];
  
  static  char        	init_done = COLD;
  static	int		shutdown_in_progress = FALSE;
  static	int		suspend_in_progress = FALSE;
  static	char		sc_malloc = FALSE;
  
  static	int		saver_mode = CONS_NO_SAVER; /* LKM/user saver */
  static	int		run_scrn_saver = FALSE;	/* should run the saver? */
  static	int		enable_bell = TRUE; /* enable beeper */
  
  #ifndef SC_DISABLE_REBOOT
  static  int		enable_reboot = TRUE; /* enable keyboard reboot */
  #endif
  
  #ifndef SC_DISABLE_KDBKEY
  static  int		enable_kdbkey = TRUE; /* enable keyboard debug */
  #endif
  
  static	long        	scrn_blank_time = 0;    /* screen saver timeout value */
  #ifdef DEV_SPLASH
  static	int     	scrn_blanked;		/* # of blanked screen */
  static	int		sticky_splash = FALSE;
  
  static	void		none_saver(sc_softc_t *sc, int blank) { }
  static	void		(*current_saver)(sc_softc_t *, int) = none_saver;
  #endif
  
  #ifdef SC_NO_SUSPEND_VTYSWITCH
  static	int		sc_no_suspend_vtswitch = 1;
  #else
  static	int		sc_no_suspend_vtswitch = 0;
  #endif
  static	int		sc_susp_scr;
  
  static SYSCTL_NODE(_hw, OID_AUTO, syscons, CTLFLAG_RD, 0, "syscons");
  static SYSCTL_NODE(_hw_syscons, OID_AUTO, saver, CTLFLAG_RD, 0, "saver");
  SYSCTL_INT(_hw_syscons_saver, OID_AUTO, keybonly, CTLFLAG_RW,
      &sc_saver_keyb_only, 0, "screen saver interrupted by input only");
  SYSCTL_INT(_hw_syscons, OID_AUTO, bell, CTLFLAG_RW, &enable_bell, 
      0, "enable bell");
  #ifndef SC_DISABLE_REBOOT
  SYSCTL_INT(_hw_syscons, OID_AUTO, kbd_reboot, CTLFLAG_RW|CTLFLAG_SECURE, &enable_reboot,
      0, "enable keyboard reboot");
  #endif
  #ifndef SC_DISABLE_KDBKEY
  SYSCTL_INT(_hw_syscons, OID_AUTO, kbd_debug, CTLFLAG_RW|CTLFLAG_SECURE, &enable_kdbkey,
      0, "enable keyboard debug");
  #endif
  SYSCTL_INT(_hw_syscons, OID_AUTO, sc_no_suspend_vtswitch, CTLFLAG_RWTUN,
      &sc_no_suspend_vtswitch, 0, "Disable VT switch before suspend.");
  #if !defined(SC_NO_FONT_LOADING) && defined(SC_DFLT_FONT)
  #include "font.h"
  #endif
  
  	tsw_ioctl_t	*sc_user_ioctl;
  
  static	bios_values_t	bios_value;
  
  static	int		enable_panic_key;
  SYSCTL_INT(_machdep, OID_AUTO, enable_panic_key, CTLFLAG_RW, &enable_panic_key,
  	   0, "Enable panic via keypress specified in kbdmap(5)");
  
  #define SC_CONSOLECTL	255
  
  #define VTY_WCHAN(sc, vty) (&SC_DEV(sc, vty))
  
  static	int		debugger;
  
  /* prototypes */
  static int sc_allocate_keyboard(sc_softc_t *sc, int unit);
  static int scvidprobe(int unit, int flags, int cons);
  static int sckbdprobe(int unit, int flags, int cons);
  static void scmeminit(void *arg);
  static int scdevtounit(struct tty *tp);
  static kbd_callback_func_t sckbdevent;
  static void scinit(int unit, int flags);
  static scr_stat *sc_get_stat(struct tty *tp);
  static void scterm(int unit, int flags);
  static void scshutdown(void *, int);
  static void scsuspend(void *);
  static void scresume(void *);
  static u_int scgetc(sc_softc_t *sc, u_int flags);
  static void sc_puts(scr_stat *scp, u_char *buf, int len, int kernel);
  #define SCGETC_CN	1
  #define SCGETC_NONBLOCK	2
  static void sccnupdate(scr_stat *scp);
  static scr_stat *alloc_scp(sc_softc_t *sc, int vty);
  static void init_scp(sc_softc_t *sc, int vty, scr_stat *scp);
  static timeout_t scrn_timer;
  static int and_region(int *s1, int *e1, int s2, int e2);
  static void scrn_update(scr_stat *scp, int show_cursor);
  
  #ifdef DEV_SPLASH
  static int scsplash_callback(int event, void *arg);
  static void scsplash_saver(sc_softc_t *sc, int show);
  static int add_scrn_saver(void (*this_saver)(sc_softc_t *, int));
  static int remove_scrn_saver(void (*this_saver)(sc_softc_t *, int));
  static int set_scrn_saver_mode(scr_stat *scp, int mode, u_char *pal, int border);
  static int restore_scrn_saver_mode(scr_stat *scp, int changemode);
  static void stop_scrn_saver(sc_softc_t *sc, void (*saver)(sc_softc_t *, int));
  static int wait_scrn_saver_stop(sc_softc_t *sc);
  #define scsplash_stick(stick)		(sticky_splash = (stick))
  #else /* !DEV_SPLASH */
  #define scsplash_stick(stick)
  #endif /* DEV_SPLASH */
  
  static int do_switch_scr(sc_softc_t *sc, int s);
  static int vt_proc_alive(scr_stat *scp);
  static int signal_vt_rel(scr_stat *scp);
  static int signal_vt_acq(scr_stat *scp);
  static int finish_vt_rel(scr_stat *scp, int release, int *s);
  static int finish_vt_acq(scr_stat *scp);
  static void exchange_scr(sc_softc_t *sc);
  static void update_cursor_image(scr_stat *scp);
  static void change_cursor_shape(scr_stat *scp, int flags, int base, int height);
  static void update_font(scr_stat *);
  static int save_kbd_state(scr_stat *scp);
  static int update_kbd_state(scr_stat *scp, int state, int mask);
  static int update_kbd_leds(scr_stat *scp, int which);
  static timeout_t blink_screen;
  static struct tty *sc_alloc_tty(int, int);
  
  static cn_probe_t	sc_cnprobe;
  static cn_init_t	sc_cninit;
  static cn_term_t	sc_cnterm;
  static cn_getc_t	sc_cngetc;
  static cn_putc_t	sc_cnputc;
  static cn_grab_t	sc_cngrab;
  static cn_ungrab_t	sc_cnungrab;
  
  CONSOLE_DRIVER(sc);
  
  static	tsw_open_t	sctty_open;
  static	tsw_close_t	sctty_close;
  static	tsw_outwakeup_t	sctty_outwakeup;
  static	tsw_ioctl_t	sctty_ioctl;
  static	tsw_mmap_t	sctty_mmap;
  
  static struct ttydevsw sc_ttydevsw = {
  	.tsw_open	= sctty_open,
  	.tsw_close	= sctty_close,
  	.tsw_outwakeup	= sctty_outwakeup,
  	.tsw_ioctl	= sctty_ioctl,
  	.tsw_mmap	= sctty_mmap,
  };
  
  static d_ioctl_t	consolectl_ioctl;
  static d_close_t	consolectl_close;
  
  static struct cdevsw consolectl_devsw = {
  	.d_version	= D_VERSION,
  	.d_flags	= D_NEEDGIANT | D_TRACKCLOSE,
  	.d_ioctl	= consolectl_ioctl,
  	.d_close	= consolectl_close,
  	.d_name		= "consolectl",
  };
  
  int
  sc_probe_unit(int unit, int flags)
  {
      if (!vty_enabled(VTY_SC))
          return ENXIO;
      if (!scvidprobe(unit, flags, FALSE)) {
  	if (bootverbose)
  	    printf("%s%d: no video adapter found.\n", SC_DRIVER_NAME, unit);
  	return ENXIO;
      }
  
      /* syscons will be attached even when there is no keyboard */
      sckbdprobe(unit, flags, FALSE);
  
      return 0;
  }
  
  /* probe video adapters, return TRUE if found */ 
  static int
  scvidprobe(int unit, int flags, int cons)
  {
      /*
       * Access the video adapter driver through the back door!
       * Video adapter drivers need to be configured before syscons.
       * However, when syscons is being probed as the low-level console,
       * they have not been initialized yet.  We force them to initialize
       * themselves here. XXX
       */
      vid_configure(cons ? VIO_PROBE_ONLY : 0);
  
      return (vid_find_adapter("*", unit) >= 0);
  }
  
  /* probe the keyboard, return TRUE if found */
  static int
  sckbdprobe(int unit, int flags, int cons)
  {
      /* access the keyboard driver through the backdoor! */
      kbd_configure(cons ? KB_CONF_PROBE_ONLY : 0);
  
      return (kbd_find_keyboard("*", unit) >= 0);
  }
  
  static char
  *adapter_name(video_adapter_t *adp)
  {
      static struct {
  	int type;
  	char *name[2];
      } names[] = {
  	{ KD_MONO,	{ "MDA",	"MDA" } },
  	{ KD_HERCULES,	{ "Hercules",	"Hercules" } },
  	{ KD_CGA,	{ "CGA",	"CGA" } },
  	{ KD_EGA,	{ "EGA",	"EGA (mono)" } },
  	{ KD_VGA,	{ "VGA",	"VGA (mono)" } },
  	{ KD_PC98,	{ "PC-98x1",	"PC-98x1" } },
  	{ KD_TGA,	{ "TGA",	"TGA" } },
  	{ -1,		{ "Unknown",	"Unknown" } },
      };
      int i;
  
      for (i = 0; names[i].type != -1; ++i)
  	if (names[i].type == adp->va_type)
  	    break;
      return names[i].name[(adp->va_flags & V_ADP_COLOR) ? 0 : 1];
  }
  
  static void
  sctty_outwakeup(struct tty *tp)
  {
      size_t len;
      u_char buf[PCBURST];
      scr_stat *scp = sc_get_stat(tp);
  
      if (scp->status & SLKED ||
  	(scp == scp->sc->cur_scp && scp->sc->blink_in_progress))
  	return;
  
      for (;;) {
  	len = ttydisc_getc(tp, buf, sizeof buf);
  	if (len == 0)
  	    break;
  	sc_puts(scp, buf, len, 0);
      }
  }
  
  static struct tty *
  sc_alloc_tty(int index, int devnum)
  {
  	struct sc_ttysoftc *stc;
  	struct tty *tp;
  
  	/* Allocate TTY object and softc to store unit number. */
  	stc = malloc(sizeof(struct sc_ttysoftc), M_DEVBUF, M_WAITOK);
  	stc->st_index = index;
  	stc->st_stat = NULL;
  	tp = tty_alloc_mutex(&sc_ttydevsw, stc, &Giant);
  
  	/* Create device node. */
  	tty_makedev(tp, NULL, "v%r", devnum);
  
  	return (tp);
  }
  
  #ifdef SC_PIXEL_MODE
  static void
  sc_set_vesa_mode(scr_stat *scp, sc_softc_t *sc, int unit)
  {
  	video_info_t info;
  	u_char *font;
  	int depth;
  	int fontsize;
  	int i;
  	int vmode;
  
  	vmode = 0;
  	(void)resource_int_value("sc", unit, "vesa_mode", &vmode);
  	if (vmode < M_VESA_BASE || vmode > M_VESA_MODE_MAX ||
  	    vidd_get_info(sc->adp, vmode, &info) != 0 ||
  	    !sc_support_pixel_mode(&info))
  		vmode = 0;
  
  	/*
  	 * If the mode is unset or unsupported, search for an available
  	 * 800x600 graphics mode with the highest color depth.
  	 */
  	if (vmode == 0) {
  		for (depth = 0, i = M_VESA_BASE; i <= M_VESA_MODE_MAX; i++)
  			if (vidd_get_info(sc->adp, i, &info) == 0 &&
  			    info.vi_width == 800 && info.vi_height == 600 &&
  			    sc_support_pixel_mode(&info) &&
  			    info.vi_depth > depth) {
  				vmode = i;
  				depth = info.vi_depth;
  			}
  		if (vmode == 0)
  			return;
  		vidd_get_info(sc->adp, vmode, &info);
  	}
  
  #if !defined(SC_NO_FONT_LOADING) && defined(SC_DFLT_FONT)
  	fontsize = info.vi_cheight;
  #else
  	fontsize = scp->font_size;
  #endif
  	if (fontsize < 14)
  		fontsize = 8;
  	else if (fontsize >= 16)
  		fontsize = 16;
  	else
  		fontsize = 14;
  #ifndef SC_NO_FONT_LOADING
  	switch (fontsize) {
  	case 8:
  		if ((sc->fonts_loaded & FONT_8) == 0)
  			return;
  		font = sc->font_8;
  		break;
  	case 14:
  		if ((sc->fonts_loaded & FONT_14) == 0)
  			return;
  		font = sc->font_14;
  		break;
  	case 16:
  		if ((sc->fonts_loaded & FONT_16) == 0)
  			return;
  		font = sc->font_16;
  		break;
  	}
  #else
  	font = NULL;
  #endif
  #ifdef DEV_SPLASH
  	if ((sc->flags & SC_SPLASH_SCRN) != 0)
  		splash_term(sc->adp);
  #endif
  #ifndef SC_NO_HISTORY
  	if (scp->history != NULL) {
  		sc_vtb_append(&scp->vtb, 0, scp->history,
  		    scp->ypos * scp->xsize + scp->xpos);
  		scp->history_pos = sc_vtb_tail(scp->history);
  	}
  #endif
  	vidd_set_mode(sc->adp, vmode);
  	scp->status |= (UNKNOWN_MODE | PIXEL_MODE | MOUSE_HIDDEN);
  	scp->status &= ~(GRAPHICS_MODE | MOUSE_VISIBLE);
  	scp->xpixel = info.vi_width;
  	scp->ypixel = info.vi_height;
  	scp->xsize = scp->xpixel / 8;
  	scp->ysize = scp->ypixel / fontsize;
  	scp->xpos = 0;
  	scp->ypos = scp->ysize - 1;
  	scp->xoff = scp->yoff = 0;
  	scp->font = font;
  	scp->font_size = fontsize;
  	scp->font_width = 8;
  	scp->start = scp->xsize * scp->ysize - 1;
  	scp->end = 0;
  	scp->cursor_pos = scp->cursor_oldpos = scp->xsize * scp->xsize;
  	scp->mode = sc->initial_mode = vmode;
  #ifndef __sparc64__
  	sc_vtb_init(&scp->scr, VTB_FRAMEBUFFER, scp->xsize, scp->ysize,
  	    (void *)sc->adp->va_window, FALSE);
  #endif
  	sc_alloc_scr_buffer(scp, FALSE, FALSE);
  	sc_init_emulator(scp, NULL);
  #ifndef SC_NO_CUTPASTE
  	sc_alloc_cut_buffer(scp, FALSE);
  #endif
  #ifndef SC_NO_HISTORY
  	sc_alloc_history_buffer(scp, 0, 0, FALSE);
  #endif
  	sc_set_border(scp, scp->border);
  	sc_set_cursor_image(scp);
  	scp->status &= ~UNKNOWN_MODE;
  #ifdef DEV_SPLASH
  	if ((sc->flags & SC_SPLASH_SCRN) != 0)
  		splash_init(sc->adp, scsplash_callback, sc);
  #endif
  }
  #endif
  
  int
  sc_attach_unit(int unit, int flags)
  {
      sc_softc_t *sc;
      scr_stat *scp;
      struct cdev *dev;
      int vc;
  
      if (!vty_enabled(VTY_SC))
          return ENXIO;
  
      flags &= ~SC_KERNEL_CONSOLE;
  
      if (sc_console_unit == unit) {
  	/*
  	 * If this unit is being used as the system console, we need to
  	 * adjust some variables and buffers before and after scinit().
  	 */
  	/* assert(sc_console != NULL) */
  	flags |= SC_KERNEL_CONSOLE;
  	scmeminit(NULL);
      }
      scinit(unit, flags);
  
      sc = sc_get_softc(unit, flags & SC_KERNEL_CONSOLE);
      sc->config = flags;
      callout_init(&sc->ctimeout, 0);
      callout_init(&sc->cblink, 0);
      scp = sc_get_stat(sc->dev[0]);
      if (sc_console == NULL)	/* sc_console_unit < 0 */
  	sc_console = scp;
  
  #ifdef SC_PIXEL_MODE
      if ((sc->config & SC_VESAMODE) != 0)
  	sc_set_vesa_mode(scp, sc, unit);
  #endif /* SC_PIXEL_MODE */
  
      /* initialize cursor */
      if (!ISGRAPHSC(scp))
      	update_cursor_image(scp);
  
      /* get screen update going */
      scrn_timer(sc);
  
      /* set up the keyboard */
      (void)kbdd_ioctl(sc->kbd, KDSKBMODE, (caddr_t)&scp->kbd_mode);
      update_kbd_state(scp, scp->status, LOCK_MASK);
  
      printf("%s%d: %s <%d virtual consoles, flags=0x%x>\n",
  	   SC_DRIVER_NAME, unit, adapter_name(sc->adp), sc->vtys, sc->config);
      if (bootverbose) {
  	printf("%s%d:", SC_DRIVER_NAME, unit);
      	if (sc->adapter >= 0)
  	    printf(" fb%d", sc->adapter);
  	if (sc->keyboard >= 0)
  	    printf(", kbd%d", sc->keyboard);
  	if (scp->tsw)
  	    printf(", terminal emulator: %s (%s)",
  		   scp->tsw->te_name, scp->tsw->te_desc);
  	printf("\n");
      }
  
      /* Register suspend/resume/shutdown callbacks for the kernel console. */
      if (sc_console_unit == unit) {
  	EVENTHANDLER_REGISTER(power_suspend_early, scsuspend, NULL,
  			      EVENTHANDLER_PRI_ANY);
  	EVENTHANDLER_REGISTER(power_resume, scresume, NULL,
  			      EVENTHANDLER_PRI_ANY);
  	EVENTHANDLER_REGISTER(shutdown_pre_sync, scshutdown, NULL,
  			      SHUTDOWN_PRI_DEFAULT);
      }
  
      for (vc = 0; vc < sc->vtys; vc++) {
  	if (sc->dev[vc] == NULL) {
  		sc->dev[vc] = sc_alloc_tty(vc, vc + unit * MAXCONS);
  		if (vc == 0 && sc->dev == main_devs)
  			SC_STAT(sc->dev[0]) = &main_console;
  	}
  	/*
  	 * The first vty already has struct tty and scr_stat initialized
  	 * in scinit().  The other vtys will have these structs when
  	 * first opened.
  	 */
      }
  
      dev = make_dev(&consolectl_devsw, 0, UID_ROOT, GID_WHEEL, 0600,
          "consolectl");
      dev->si_drv1 = sc->dev[0];
  
      return 0;
  }
  
  static void
  scmeminit(void *arg)
  {
      if (!vty_enabled(VTY_SC))
          return;
      if (sc_malloc)
  	return;
      sc_malloc = TRUE;
  
      /*
       * As soon as malloc() becomes functional, we had better allocate
       * various buffers for the kernel console.
       */
  
      if (sc_console_unit < 0)	/* sc_console == NULL */
  	return;
  
      /* copy the temporary buffer to the final buffer */
      sc_alloc_scr_buffer(sc_console, FALSE, FALSE);
  
  #ifndef SC_NO_CUTPASTE
      sc_alloc_cut_buffer(sc_console, FALSE);
  #endif
  
  #ifndef SC_NO_HISTORY
      /* initialize history buffer & pointers */
      sc_alloc_history_buffer(sc_console, 0, 0, FALSE);
  #endif
  }
  
  /* XXX */
  SYSINIT(sc_mem, SI_SUB_KMEM, SI_ORDER_ANY, scmeminit, NULL);
  
  static int
  scdevtounit(struct tty *tp)
  {
      int vty = SC_VTY(tp);
  
      if (vty == SC_CONSOLECTL)
  	return ((sc_console != NULL) ? sc_console->sc->unit : -1);
      else if ((vty < 0) || (vty >= MAXCONS*sc_max_unit()))
  	return -1;
      else
  	return vty/MAXCONS;
  }
  
  static int
  sctty_open(struct tty *tp)
  {
      int unit = scdevtounit(tp);
      sc_softc_t *sc;
      scr_stat *scp;
  #ifndef __sparc64__
      keyarg_t key;
  #endif
  
      DPRINTF(5, ("scopen: dev:%s, unit:%d, vty:%d\n",
  		devtoname(tp->t_dev), unit, SC_VTY(tp)));
  
      sc = sc_get_softc(unit, (sc_console_unit == unit) ? SC_KERNEL_CONSOLE : 0);
      if (sc == NULL)
  	return ENXIO;
  
      if (!tty_opened(tp)) {
          /* Use the current setting of the <-- key as default VERASE. */  
          /* If the Delete key is preferable, an stty is necessary     */
  #ifndef __sparc64__
  	if (sc->kbd != NULL) {
  	    key.keynum = KEYCODE_BS;
  	    (void)kbdd_ioctl(sc->kbd, GIO_KEYMAPENT, (caddr_t)&key);
              tp->t_termios.c_cc[VERASE] = key.key.map[0];
  	}
  #endif
      }
  
      scp = sc_get_stat(tp);
      if (scp == NULL) {
  	scp = SC_STAT(tp) = alloc_scp(sc, SC_VTY(tp));
  	if (ISGRAPHSC(scp))
  	    sc_set_pixel_mode(scp, NULL, 0, 0, 16, 8);
      }
      if (!tp->t_winsize.ws_col && !tp->t_winsize.ws_row) {
  	tp->t_winsize.ws_col = scp->xsize;
  	tp->t_winsize.ws_row = scp->ysize;
      }
  
      return (0);
  }
  
  static void
  sctty_close(struct tty *tp)
  {
      scr_stat *scp;
      int s;
  
      if (SC_VTY(tp) != SC_CONSOLECTL) {
  	scp = sc_get_stat(tp);
  	/* were we in the middle of the VT switching process? */
  	DPRINTF(5, ("sc%d: scclose(), ", scp->sc->unit));
  	s = spltty();
  	if ((scp == scp->sc->cur_scp) && (scp->sc->unit == sc_console_unit))
  	    cnavailable(sc_consptr, TRUE);
  	if (finish_vt_rel(scp, TRUE, &s) == 0)	/* force release */
  	    DPRINTF(5, ("reset WAIT_REL, "));
  	if (finish_vt_acq(scp) == 0)		/* force acknowledge */
  	    DPRINTF(5, ("reset WAIT_ACQ, "));
  #ifdef not_yet_done
  	if (scp == &main_console) {
  	    scp->pid = 0;
  	    scp->proc = NULL;
  	    scp->smode.mode = VT_AUTO;
  	}
  	else {
  	    sc_vtb_destroy(&scp->vtb);
  #ifndef __sparc64__
  	    sc_vtb_destroy(&scp->scr);
  #endif
  	    sc_free_history_buffer(scp, scp->ysize);
  	    SC_STAT(tp) = NULL;
  	    free(scp, M_DEVBUF);
  	}
  #else
  	scp->pid = 0;
  	scp->proc = NULL;
  	scp->smode.mode = VT_AUTO;
  #endif
  	scp->kbd_mode = K_XLATE;
  	if (scp == scp->sc->cur_scp)
  	    (void)kbdd_ioctl(scp->sc->kbd, KDSKBMODE, (caddr_t)&scp->kbd_mode);
  	DPRINTF(5, ("done.\n"));
      }
  }
  
  #if 0 /* XXX mpsafetty: fix screensaver. What about outwakeup? */
  static int
  scread(struct cdev *dev, struct uio *uio, int flag)
  {
      if (!sc_saver_keyb_only)
  	sc_touch_scrn_saver();
      return ttyread(dev, uio, flag);
  }
  #endif
  
  static int
  sckbdevent(keyboard_t *thiskbd, int event, void *arg)
  {
      sc_softc_t *sc;
      struct tty *cur_tty;
      int c, error = 0; 
      size_t len;
      const u_char *cp;
  
      sc = (sc_softc_t *)arg;
      /* assert(thiskbd == sc->kbd) */
  
      mtx_lock(&Giant);
  
      switch (event) {
      case KBDIO_KEYINPUT:
  	break;
      case KBDIO_UNLOADING:
  	sc->kbd = NULL;
  	sc->keyboard = -1;
  	kbd_release(thiskbd, (void *)&sc->keyboard);
  	goto done;
      default:
  	error = EINVAL;
  	goto done;
      }
  
      /* 
       * Loop while there is still input to get from the keyboard.
       * I don't think this is nessesary, and it doesn't fix
       * the Xaccel-2.1 keyboard hang, but it can't hurt.		XXX
       */
      while ((c = scgetc(sc, SCGETC_NONBLOCK)) != NOKEY) {
  
  	cur_tty = SC_DEV(sc, sc->cur_scp->index);
  	if (!tty_opened_ns(cur_tty))
  	    continue;
  
  	if ((*sc->cur_scp->tsw->te_input)(sc->cur_scp, c, cur_tty))
  	    continue;
  
  	switch (KEYFLAGS(c)) {
  	case 0x0000: /* normal key */
  	    ttydisc_rint(cur_tty, KEYCHAR(c), 0);
  	    break;
  	case FKEY:  /* function key, return string */
  	    cp = (*sc->cur_scp->tsw->te_fkeystr)(sc->cur_scp, c);
  	    if (cp != NULL) {
  	    	ttydisc_rint_simple(cur_tty, cp, strlen(cp));
  		break;
  	    }
  	    cp = kbdd_get_fkeystr(thiskbd, KEYCHAR(c), &len);
  	    if (cp != NULL)
  	    	ttydisc_rint_simple(cur_tty, cp, len);
  	    break;
  	case MKEY:  /* meta is active, prepend ESC */
  	    ttydisc_rint(cur_tty, 0x1b, 0);
  	    ttydisc_rint(cur_tty, KEYCHAR(c), 0);
  	    break;
  	case BKEY:  /* backtab fixed sequence (esc [ Z) */
  	    ttydisc_rint_simple(cur_tty, "\x1B[Z", 3);
  	    break;
  	}
  
  	ttydisc_rint_done(cur_tty);
      }
  
      sc->cur_scp->status |= MOUSE_HIDDEN;
  
  done:
      mtx_unlock(&Giant);
      return (error);
  }
  
  static int
  sctty_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
  {
      int error;
      int i;
      sc_softc_t *sc;
      scr_stat *scp;
      int s;
  #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
      defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
      int ival;
  #endif
  
      /* If there is a user_ioctl function call that first */
      if (sc_user_ioctl) {
  	error = (*sc_user_ioctl)(tp, cmd, data, td);
  	if (error != ENOIOCTL)
  	    return error;
      }
  
      error = sc_vid_ioctl(tp, cmd, data, td);
      if (error != ENOIOCTL)
  	return error;
  
  #ifndef SC_NO_HISTORY
      error = sc_hist_ioctl(tp, cmd, data, td);
      if (error != ENOIOCTL)
  	return error;
  #endif
  
  #ifndef SC_NO_SYSMOUSE
      error = sc_mouse_ioctl(tp, cmd, data, td);
      if (error != ENOIOCTL)
  	return error;
  #endif
  
      scp = sc_get_stat(tp);
      /* assert(scp != NULL) */
      /* scp is sc_console, if SC_VTY(dev) == SC_CONSOLECTL. */
      sc = scp->sc;
  
      if (scp->tsw) {
  	error = (*scp->tsw->te_ioctl)(scp, tp, cmd, data, td);
  	if (error != ENOIOCTL)
  	    return error;
      }
  
      switch (cmd) {  		/* process console hardware related ioctl's */
  
      case GIO_ATTR:      	/* get current attributes */
  	/* this ioctl is not processed here, but in the terminal emulator */
  	return ENOTTY;
  
      case GIO_COLOR:     	/* is this a color console ? */
  	*(int *)data = (sc->adp->va_flags & V_ADP_COLOR) ? 1 : 0;
  	return 0;
  
      case CONS_BLANKTIME:    	/* set screen saver timeout (0 = no saver) */
  	if (*(int *)data < 0 || *(int *)data > MAX_BLANKTIME)
              return EINVAL;
  	s = spltty();
  	scrn_blank_time = *(int *)data;
  	run_scrn_saver = (scrn_blank_time != 0);
  	splx(s);
  	return 0;
  
      case CONS_CURSORTYPE:   	/* set cursor type (obsolete) */
  	s = spltty();
  	*(int *)data &= CONS_CURSOR_ATTRS;
  	sc_change_cursor_shape(scp, *(int *)data, -1, -1);
  	splx(s);
  	return 0;
  
      case CONS_GETCURSORSHAPE:   /* get cursor shape (new interface) */
  	if (((int *)data)[0] & CONS_LOCAL_CURSOR) {
  	    ((int *)data)[0] = scp->curr_curs_attr.flags;
  	    ((int *)data)[1] = scp->curr_curs_attr.base;
  	    ((int *)data)[2] = scp->curr_curs_attr.height;
  	} else {
  	    ((int *)data)[0] = sc->curs_attr.flags;
  	    ((int *)data)[1] = sc->curs_attr.base;
  	    ((int *)data)[2] = sc->curs_attr.height;
  	}
  	return 0;
  
      case CONS_SETCURSORSHAPE:   /* set cursor shape (new interface) */
  	s = spltty();
  	sc_change_cursor_shape(scp, ((int *)data)[0],
  	    ((int *)data)[1], ((int *)data)[2]);
  	splx(s);
  	return 0;
  
      case CONS_BELLTYPE: 	/* set bell type sound/visual */
  	if ((*(int *)data) & CONS_VISUAL_BELL)
  	    sc->flags |= SC_VISUAL_BELL;
  	else
  	    sc->flags &= ~SC_VISUAL_BELL;
  	if ((*(int *)data) & CONS_QUIET_BELL)
  	    sc->flags |= SC_QUIET_BELL;
  	else
  	    sc->flags &= ~SC_QUIET_BELL;
  	return 0;
  
      case CONS_GETINFO:  	/* get current (virtual) console info */
      {
  	vid_info_t *ptr = (vid_info_t*)data;
  	if (ptr->size == sizeof(struct vid_info)) {
  	    ptr->m_num = sc->cur_scp->index;
  	    ptr->font_size = scp->font_size;
  	    ptr->mv_col = scp->xpos;
  	    ptr->mv_row = scp->ypos;
  	    ptr->mv_csz = scp->xsize;
  	    ptr->mv_rsz = scp->ysize;
  	    ptr->mv_hsz = (scp->history != NULL) ? scp->history->vtb_rows : 0;
  	    /*
  	     * The following fields are filled by the terminal emulator. XXX
  	     *
  	     * ptr->mv_norm.fore
  	     * ptr->mv_norm.back
  	     * ptr->mv_rev.fore
  	     * ptr->mv_rev.back
  	     */
  	    ptr->mv_grfc.fore = 0;      /* not supported */
  	    ptr->mv_grfc.back = 0;      /* not supported */
  	    ptr->mv_ovscan = scp->border;
  	    if (scp == sc->cur_scp)
  		save_kbd_state(scp);
  	    ptr->mk_keylock = scp->status & LOCK_MASK;
  	    return 0;
  	}
  	return EINVAL;
      }
  
      case CONS_GETVERS:  	/* get version number */
  	*(int*)data = 0x200;    /* version 2.0 */
  	return 0;
  
      case CONS_IDLE:		/* see if the screen has been idle */
  	/*
  	 * When the screen is in the GRAPHICS_MODE or UNKNOWN_MODE,
  	 * the user process may have been writing something on the
  	 * screen and syscons is not aware of it. Declare the screen
  	 * is NOT idle if it is in one of these modes. But there is
  	 * an exception to it; if a screen saver is running in the 
  	 * graphics mode in the current screen, we should say that the
  	 * screen has been idle.
  	 */
  	*(int *)data = (sc->flags & SC_SCRN_IDLE)
  		       && (!ISGRAPHSC(sc->cur_scp)
  			   || (sc->cur_scp->status & SAVER_RUNNING));
  	return 0;
  
      case CONS_SAVERMODE:	/* set saver mode */
  	switch(*(int *)data) {
  	case CONS_NO_SAVER:
  	case CONS_USR_SAVER:
  	    /* if a LKM screen saver is running, stop it first. */
  	    scsplash_stick(FALSE);
  	    saver_mode = *(int *)data;
  	    s = spltty();
  #ifdef DEV_SPLASH
  	    if ((error = wait_scrn_saver_stop(NULL))) {
  		splx(s);
  		return error;
  	    }
  #endif
  	    run_scrn_saver = TRUE;
  	    if (saver_mode == CONS_USR_SAVER)
  		scp->status |= SAVER_RUNNING;
  	    else
  		scp->status &= ~SAVER_RUNNING;
  	    scsplash_stick(TRUE);
  	    splx(s);
  	    break;
  	case CONS_LKM_SAVER:
  	    s = spltty();
  	    if ((saver_mode == CONS_USR_SAVER) && (scp->status & SAVER_RUNNING))
  		scp->status &= ~SAVER_RUNNING;
  	    saver_mode = *(int *)data;
  	    splx(s);
  	    break;
  	default:
  	    return EINVAL;
  	}
  	return 0;
  
      case CONS_SAVERSTART:	/* immediately start/stop the screen saver */
  	/*
  	 * Note that this ioctl does not guarantee the screen saver 
  	 * actually starts or stops. It merely attempts to do so...
  	 */
  	s = spltty();
  	run_scrn_saver = (*(int *)data != 0);
  	if (run_scrn_saver)
  	    sc->scrn_time_stamp -= scrn_blank_time;
  	splx(s);
  	return 0;
  
      case CONS_SCRSHOT:		/* get a screen shot */
      {
  	int retval, hist_rsz;
  	size_t lsize, csize;
  	vm_offset_t frbp, hstp;
  	unsigned lnum;
  	scrshot_t *ptr = (scrshot_t *)data;
  	void *outp = ptr->buf;
  
  	if (ptr->x < 0 || ptr->y < 0 || ptr->xsize < 0 || ptr->ysize < 0)
  		return EINVAL;
  	s = spltty();
  	if (ISGRAPHSC(scp)) {
  	    splx(s);
  	    return EOPNOTSUPP;
  	}
  	hist_rsz = (scp->history != NULL) ? scp->history->vtb_rows : 0;
  	if (((u_int)ptr->x + ptr->xsize) > scp->xsize ||
  	    ((u_int)ptr->y + ptr->ysize) > (scp->ysize + hist_rsz)) {
  	    splx(s);
  	    return EINVAL;
  	}
  
  	lsize = scp->xsize * sizeof(u_int16_t);
  	csize = ptr->xsize * sizeof(u_int16_t);
  	/* Pointer to the last line of framebuffer */
  	frbp = scp->vtb.vtb_buffer + scp->ysize * lsize + ptr->x *
  	       sizeof(u_int16_t);
  	/* Pointer to the last line of target buffer */
  	outp = (char *)outp + ptr->ysize * csize;
  	/* Pointer to the last line of history buffer */
  	if (scp->history != NULL)
  	    hstp = scp->history->vtb_buffer + sc_vtb_tail(scp->history) *
  		sizeof(u_int16_t) + ptr->x * sizeof(u_int16_t);
  	else
  	    hstp = 0;
  
  	retval = 0;
  	for (lnum = 0; lnum < (ptr->y + ptr->ysize); lnum++) {
  	    if (lnum < scp->ysize) {
  		frbp -= lsize;
  	    } else {
  		hstp -= lsize;
  		if (hstp < scp->history->vtb_buffer)
  		    hstp += scp->history->vtb_rows * lsize;
  		frbp = hstp;
  	    }
  	    if (lnum < ptr->y)
  		continue;
  	    outp = (char *)outp - csize;
  	    retval = copyout((void *)frbp, outp, csize);
  	    if (retval != 0)
  		break;
  	}
  	splx(s);
  	return retval;
      }
  
      case VT_SETMODE:    	/* set screen switcher mode */
      {
  	struct vt_mode *mode;
  	struct proc *p1;
  
  	mode = (struct vt_mode *)data;
  	DPRINTF(5, ("%s%d: VT_SETMODE ", SC_DRIVER_NAME, sc->unit));
  	if (scp->smode.mode == VT_PROCESS) {
  	    p1 = pfind(scp->pid);
      	    if (scp->proc == p1 && scp->proc != td->td_proc) {
  		if (p1)
  		    PROC_UNLOCK(p1);
  		DPRINTF(5, ("error EPERM\n"));
  		return EPERM;
  	    }
  	    if (p1)
  		PROC_UNLOCK(p1);
  	}
  	s = spltty();
  	if (mode->mode == VT_AUTO) {
  	    scp->smode.mode = VT_AUTO;
  	    scp->proc = NULL;
  	    scp->pid = 0;
  	    DPRINTF(5, ("VT_AUTO, "));
  	    if ((scp == sc->cur_scp) && (sc->unit == sc_console_unit))
  		cnavailable(sc_consptr, TRUE);
  	    /* were we in the middle of the vty switching process? */
  	    if (finish_vt_rel(scp, TRUE, &s) == 0)
  		DPRINTF(5, ("reset WAIT_REL, "));
  	    if (finish_vt_acq(scp) == 0)
  		DPRINTF(5, ("reset WAIT_ACQ, "));
  	} else {
  	    if (!ISSIGVALID(mode->relsig) || !ISSIGVALID(mode->acqsig)
  		|| !ISSIGVALID(mode->frsig)) {
  		splx(s);
  		DPRINTF(5, ("error EINVAL\n"));
  		return EINVAL;
  	    }
  	    DPRINTF(5, ("VT_PROCESS %d, ", td->td_proc->p_pid));
  	    bcopy(data, &scp->smode, sizeof(struct vt_mode));
  	    scp->proc = td->td_proc;
  	    scp->pid = scp->proc->p_pid;
  	    if ((scp == sc->cur_scp) && (sc->unit == sc_console_unit))
  		cnavailable(sc_consptr, FALSE);
  	}
  	splx(s);
  	DPRINTF(5, ("\n"));
  	return 0;
      }
  
      case VT_GETMODE:    	/* get screen switcher mode */
  	bcopy(&scp->smode, data, sizeof(struct vt_mode));
  	return 0;
  
  #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
      defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
      case _IO('v', 4):
  	ival = IOCPARM_IVAL(data);
  	data = (caddr_t)&ival;
  	/* FALLTHROUGH */
  #endif
      case VT_RELDISP:    	/* screen switcher ioctl */
  	s = spltty();
  	/*
  	 * This must be the current vty which is in the VT_PROCESS
  	 * switching mode...
  	 */
  	if ((scp != sc->cur_scp) || (scp->smode.mode != VT_PROCESS)) {
  	    splx(s);
  	    return EINVAL;
  	}
  	/* ...and this process is controlling it. */
  	if (scp->proc != td->td_proc) {
  	    splx(s);
  	    return EPERM;
  	}
  	error = EINVAL;
  	switch(*(int *)data) {
  	case VT_FALSE:  	/* user refuses to release screen, abort */
  	    if ((error = finish_vt_rel(scp, FALSE, &s)) == 0)
  		DPRINTF(5, ("%s%d: VT_FALSE\n", SC_DRIVER_NAME, sc->unit));
  	    break;
  	case VT_TRUE:   	/* user has released screen, go on */
  	    if ((error = finish_vt_rel(scp, TRUE, &s)) == 0)
  		DPRINTF(5, ("%s%d: VT_TRUE\n", SC_DRIVER_NAME, sc->unit));
  	    break;
  	case VT_ACKACQ: 	/* acquire acknowledged, switch completed */
  	    if ((error = finish_vt_acq(scp)) == 0)
  		DPRINTF(5, ("%s%d: VT_ACKACQ\n", SC_DRIVER_NAME, sc->unit));
  	    break;
  	default:
  	    break;
  	}
  	splx(s);
  	return error;
  
      case VT_OPENQRY:    	/* return free virtual console */
  	for (i = sc->first_vty; i < sc->first_vty + sc->vtys; i++) {
  	    tp = SC_DEV(sc, i);
  	    if (!tty_opened_ns(tp)) {
  		*(int *)data = i + 1;
  		return 0;
  	    }
  	}
  	return EINVAL;
  
  #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
      defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
      case _IO('v', 5):
  	ival = IOCPARM_IVAL(data);
  	data = (caddr_t)&ival;
  	/* FALLTHROUGH */
  #endif
      case VT_ACTIVATE:   	/* switch to screen *data */
  	i = (*(int *)data == 0) ? scp->index : (*(int *)data - 1);
  	s = spltty();
  	error = sc_clean_up(sc->cur_scp);
  	splx(s);
  	if (error)
  	    return error;
  	error = sc_switch_scr(sc, i);
  	return (error);
  
  #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
      defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
      case _IO('v', 6):
  	ival = IOCPARM_IVAL(data);
  	data = (caddr_t)&ival;
  	/* FALLTHROUGH */
  #endif
      case VT_WAITACTIVE: 	/* wait for switch to occur */
  	i = (*(int *)data == 0) ? scp->index : (*(int *)data - 1);
  	if ((i < sc->first_vty) || (i >= sc->first_vty + sc->vtys))
  	    return EINVAL;
  	if (i == sc->cur_scp->index)
  	    return 0;
  	error = tsleep(VTY_WCHAN(sc, i), (PZERO + 1) | PCATCH, "waitvt", 0);
  	return error;
  
      case VT_GETACTIVE:		/* get active vty # */
  	*(int *)data = sc->cur_scp->index + 1;
  	return 0;
  
      case VT_GETINDEX:		/* get this vty # */
  	*(int *)data = scp->index + 1;
  	return 0;
  
      case VT_LOCKSWITCH:		/* prevent vty switching */
  	if ((*(int *)data) & 0x01)
  	    sc->flags |= SC_SCRN_VTYLOCK;
  	else
  	    sc->flags &= ~SC_SCRN_VTYLOCK;
  	return 0;
  
      case KDENABIO:      	/* allow io operations */
  	error = priv_check(td, PRIV_IO);
  	if (error != 0)
  	    return error;
  	error = securelevel_gt(td->td_ucred, 0);
  	if (error != 0)
  		return error;
  #ifdef __i386__
  	td->td_frame->tf_eflags |= PSL_IOPL;
  #elif defined(__amd64__)
  	td->td_frame->tf_rflags |= PSL_IOPL;
  #endif
  	return 0;
  
      case KDDISABIO:     	/* disallow io operations (default) */
  #ifdef __i386__
  	td->td_frame->tf_eflags &= ~PSL_IOPL;
  #elif defined(__amd64__)
  	td->td_frame->tf_rflags &= ~PSL_IOPL;
  #endif
  	return 0;
  
  #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
      defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
      case _IO('K', 20):
  	ival = IOCPARM_IVAL(data);
  	data = (caddr_t)&ival;
  	/* FALLTHROUGH */
  #endif
      case KDSKBSTATE:    	/* set keyboard state (locks) */
  	if (*(int *)data & ~LOCK_MASK)
  	    return EINVAL;
  	scp->status &= ~LOCK_MASK;
  	scp->status |= *(int *)data;
  	if (scp == sc->cur_scp)
  	    update_kbd_state(scp, scp->status, LOCK_MASK);
  	return 0;
  
      case KDGKBSTATE:    	/* get keyboard state (locks) */
  	if (scp == sc->cur_scp)
  	    save_kbd_state(scp);
  	*(int *)data = scp->status & LOCK_MASK;
  	return 0;
  
      case KDGETREPEAT:      	/* get keyboard repeat & delay rates */
      case KDSETREPEAT:      	/* set keyboard repeat & delay rates (new) */
  	error = kbdd_ioctl(sc->kbd, cmd, data);
  	if (error == ENOIOCTL)
  	    error = ENODEV;
  	return error;
  
  #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
      defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
      case _IO('K', 67):
  	ival = IOCPARM_IVAL(data);
  	data = (caddr_t)&ival;
  	/* FALLTHROUGH */
  #endif
      case KDSETRAD:      	/* set keyboard repeat & delay rates (old) */
  	if (*(int *)data & ~0x7f)
  	    return EINVAL;
  	error = kbdd_ioctl(sc->kbd, KDSETRAD, data);
  	if (error == ENOIOCTL)
  	    error = ENODEV;
  	return error;
  
  #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
      defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
      case _IO('K', 7):
  	ival = IOCPARM_IVAL(data);
  	data = (caddr_t)&ival;
  	/* FALLTHROUGH */
  #endif
      case KDSKBMODE:     	/* set keyboard mode */
  	switch (*(int *)data) {
  	case K_XLATE:   	/* switch to XLT ascii mode */
  	case K_RAW: 		/* switch to RAW scancode mode */
  	case K_CODE: 		/* switch to CODE mode */
  	    scp->kbd_mode = *(int *)data;
  	    if (scp == sc->cur_scp)
  		(void)kbdd_ioctl(sc->kbd, KDSKBMODE, data);
  	    return 0;
  	default:
  	    return EINVAL;
  	}
  	/* NOT REACHED */
  
      case KDGKBMODE:     	/* get keyboard mode */
  	*(int *)data = scp->kbd_mode;
  	return 0;
  
      case KDGKBINFO:
  	error = kbdd_ioctl(sc->kbd, cmd, data);
  	if (error == ENOIOCTL)
  	    error = ENODEV;
  	return error;
  
  #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
      defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
      case _IO('K', 8):
  	ival = IOCPARM_IVAL(data);
  	data = (caddr_t)&ival;
  	/* FALLTHROUGH */
  #endif
      case KDMKTONE:      	/* sound the bell */
  	if (*(int*)data)
  	    sc_bell(scp, (*(int*)data)&0xffff,
  		    (((*(int*)data)>>16)&0xffff)*hz/1000);
  	else
  	    sc_bell(scp, scp->bell_pitch, scp->bell_duration);
  	return 0;
  
  #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
      defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
      case _IO('K', 63):
  	ival = IOCPARM_IVAL(data);
  	data = (caddr_t)&ival;
  	/* FALLTHROUGH */
  #endif
      case KIOCSOUND:     	/* make tone (*data) hz */
  	if (scp == sc->cur_scp) {
  	    if (*(int *)data)
  		return sc_tone(*(int *)data);
  	    else
  		return sc_tone(0);
  	}
  	return 0;
  
      case KDGKBTYPE:     	/* get keyboard type */
  	error = kbdd_ioctl(sc->kbd, cmd, data);
  	if (error == ENOIOCTL) {
  	    /* always return something? XXX */
  	    *(int *)data = 0;
  	}
  	return 0;
  
  #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
      defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
      case _IO('K', 66):
  	ival = IOCPARM_IVAL(data);
  	data = (caddr_t)&ival;
  	/* FALLTHROUGH */
  #endif
      case KDSETLED:      	/* set keyboard LED status */
  	if (*(int *)data & ~LED_MASK)	/* FIXME: LOCK_MASK? */
  	    return EINVAL;
  	scp->status &= ~LED_MASK;
  	scp->status |= *(int *)data;
  	if (scp == sc->cur_scp)
  	    update_kbd_leds(scp, scp->status);
  	return 0;
  
      case KDGETLED:      	/* get keyboard LED status */
  	if (scp == sc->cur_scp)
  	    save_kbd_state(scp);
  	*(int *)data = scp->status & LED_MASK;
  	return 0;
  
      case KBADDKBD:		/* add/remove keyboard to/from mux */
      case KBRELKBD:
  	error = kbdd_ioctl(sc->kbd, cmd, data);
  	if (error == ENOIOCTL)
  	    error = ENODEV;
  	return error;
  
  #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
      defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
      case _IO('c', 110):
  	ival = IOCPARM_IVAL(data);
  	data = (caddr_t)&ival;
  	/* FALLTHROUGH */
  #endif
      case CONS_SETKBD: 		/* set the new keyboard */
  	{
  	    keyboard_t *newkbd;
  
  	    s = spltty();
  	    newkbd = kbd_get_keyboard(*(int *)data);
  	    if (newkbd == NULL) {
  		splx(s);
  		return EINVAL;
  	    }
  	    error = 0;
  	    if (sc->kbd != newkbd) {
  		i = kbd_allocate(newkbd->kb_name, newkbd->kb_unit,
  				 (void *)&sc->keyboard, sckbdevent, sc);
  		/* i == newkbd->kb_index */
  		if (i >= 0) {
  		    if (sc->kbd != NULL) {
  			save_kbd_state(sc->cur_scp);
  			kbd_release(sc->kbd, (void *)&sc->keyboard);
  		    }
  		    sc->kbd = kbd_get_keyboard(i); /* sc->kbd == newkbd */
  		    sc->keyboard = i;
  		    (void)kbdd_ioctl(sc->kbd, KDSKBMODE,
  			      (caddr_t)&sc->cur_scp->kbd_mode);
  		    update_kbd_state(sc->cur_scp, sc->cur_scp->status,
  				     LOCK_MASK);
  		} else {
  		    error = EPERM;	/* XXX */
  		}
  	    }
  	    splx(s);
  	    return error;
  	}
  
      case CONS_RELKBD: 		/* release the current keyboard */
  	s = spltty();
  	error = 0;
  	if (sc->kbd != NULL) {
  	    save_kbd_state(sc->cur_scp);
  	    error = kbd_release(sc->kbd, (void *)&sc->keyboard);
  	    if (error == 0) {
  		sc->kbd = NULL;
  		sc->keyboard = -1;
  	    }
  	}
  	splx(s);
  	return error;
  
      case CONS_GETTERM:		/* get the current terminal emulator info */
  	{
  	    sc_term_sw_t *sw;
  
  	    if (((term_info_t *)data)->ti_index == 0) {
  		sw = scp->tsw;
  	    } else {
  		sw = sc_term_match_by_number(((term_info_t *)data)->ti_index);
  	    }
  	    if (sw != NULL) {
  		strncpy(((term_info_t *)data)->ti_name, sw->te_name, 
  			sizeof(((term_info_t *)data)->ti_name));
  		strncpy(((term_info_t *)data)->ti_desc, sw->te_desc, 
  			sizeof(((term_info_t *)data)->ti_desc));
  		((term_info_t *)data)->ti_flags = 0;
  		return 0;
  	    } else {
  		((term_info_t *)data)->ti_name[0] = '\0';
  		((term_info_t *)data)->ti_desc[0] = '\0';
  		((term_info_t *)data)->ti_flags = 0;
  		return EINVAL;
  	    }
  	}
  
      case CONS_SETTERM:		/* set the current terminal emulator */
  	s = spltty();
  	error = sc_init_emulator(scp, ((term_info_t *)data)->ti_name);
  	/* FIXME: what if scp == sc_console! XXX */
  	splx(s);
  	return error;
  
      case GIO_SCRNMAP:   	/* get output translation table */
  	bcopy(&sc->scr_map, data, sizeof(sc->scr_map));
  	return 0;
  
      case PIO_SCRNMAP:   	/* set output translation table */
  	bcopy(data, &sc->scr_map, sizeof(sc->scr_map));
  	for (i=0; i<sizeof(sc->scr_map); i++) {
  	    sc->scr_rmap[sc->scr_map[i]] = i;
  	}
  	return 0;
  
      case GIO_KEYMAP:		/* get keyboard translation table */
      case PIO_KEYMAP:		/* set keyboard translation table */
      case OGIO_KEYMAP:		/* get keyboard translation table (compat) */
      case OPIO_KEYMAP:		/* set keyboard translation table (compat) */
      case GIO_DEADKEYMAP:	/* get accent key translation table */
      case PIO_DEADKEYMAP:	/* set accent key translation table */
      case GETFKEY:		/* get function key string */
      case SETFKEY:		/* set function key string */
  	error = kbdd_ioctl(sc->kbd, cmd, data);
  	if (error == ENOIOCTL)
  	    error = ENODEV;
  	return error;
  
  #ifndef SC_NO_FONT_LOADING
  
      case PIO_FONT8x8:   	/* set 8x8 dot font */
  	if (!ISFONTAVAIL(sc->adp->va_flags))
  	    return ENXIO;
  	bcopy(data, sc->font_8, 8*256);
  	sc->fonts_loaded |= FONT_8;
  	/*
  	 * FONT KLUDGE
  	 * Always use the font page #0. XXX
  	 * Don't load if the current font size is not 8x8.
  	 */
  	if (ISTEXTSC(sc->cur_scp) && (sc->cur_scp->font_size < 14))
  	    sc_load_font(sc->cur_scp, 0, 8, 8, sc->font_8, 0, 256);
  	return 0;
  
      case GIO_FONT8x8:   	/* get 8x8 dot font */
  	if (!ISFONTAVAIL(sc->adp->va_flags))
  	    return ENXIO;
  	if (sc->fonts_loaded & FONT_8) {
  	    bcopy(sc->font_8, data, 8*256);
  	    return 0;
  	}
  	else
  	    return ENXIO;
  
      case PIO_FONT8x14:  	/* set 8x14 dot font */
  	if (!ISFONTAVAIL(sc->adp->va_flags))
  	    return ENXIO;
  	bcopy(data, sc->font_14, 14*256);
  	sc->fonts_loaded |= FONT_14;
  	/*
  	 * FONT KLUDGE
  	 * Always use the font page #0. XXX
  	 * Don't load if the current font size is not 8x14.
  	 */
  	if (ISTEXTSC(sc->cur_scp)
  	    && (sc->cur_scp->font_size >= 14)
  	    && (sc->cur_scp->font_size < 16))
  	    sc_load_font(sc->cur_scp, 0, 14, 8, sc->font_14, 0, 256);
  	return 0;
  
      case GIO_FONT8x14:  	/* get 8x14 dot font */
  	if (!ISFONTAVAIL(sc->adp->va_flags))
  	    return ENXIO;
  	if (sc->fonts_loaded & FONT_14) {
  	    bcopy(sc->font_14, data, 14*256);
  	    return 0;
  	}
  	else
  	    return ENXIO;
  
      case PIO_FONT8x16:  	/* set 8x16 dot font */
  	if (!ISFONTAVAIL(sc->adp->va_flags))
  	    return ENXIO;
  	bcopy(data, sc->font_16, 16*256);
  	sc->fonts_loaded |= FONT_16;
  	/*
  	 * FONT KLUDGE
  	 * Always use the font page #0. XXX
  	 * Don't load if the current font size is not 8x16.
  	 */
  	if (ISTEXTSC(sc->cur_scp) && (sc->cur_scp->font_size >= 16))
  	    sc_load_font(sc->cur_scp, 0, 16, 8, sc->font_16, 0, 256);
  	return 0;
  
      case GIO_FONT8x16:  	/* get 8x16 dot font */
  	if (!ISFONTAVAIL(sc->adp->va_flags))
  	    return ENXIO;
  	if (sc->fonts_loaded & FONT_16) {
  	    bcopy(sc->font_16, data, 16*256);
  	    return 0;
  	}
  	else
  	    return ENXIO;
  
  #endif /* SC_NO_FONT_LOADING */
  
      default:
  	break;
      }
  
      return (ENOIOCTL);
  }
  
  static int
  consolectl_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
      struct thread *td)
  {
  
  	return sctty_ioctl(dev->si_drv1, cmd, data, td);
  }
  
  static int
  consolectl_close(struct cdev *dev, int flags, int mode, struct thread *td)
  {
  #ifndef SC_NO_SYSMOUSE
  	mouse_info_t info;
  	memset(&info, 0, sizeof(info));
  	info.operation = MOUSE_ACTION;
  
  	/*
  	 * Make sure all buttons are released when moused and other
  	 * console daemons exit, so that no buttons are left pressed.
  	 */
  	(void) sctty_ioctl(dev->si_drv1, CONS_MOUSECTL, (caddr_t)&info, td);
  #endif
  	return (0);
  }
  
  static void
  sc_cnprobe(struct consdev *cp)
  {
      int unit;
      int flags;
  
      if (!vty_enabled(VTY_SC)) {
  	cp->cn_pri = CN_DEAD;
  	return;
      }
  
      cp->cn_pri = sc_get_cons_priority(&unit, &flags);
  
      /* a video card is always required */
      if (!scvidprobe(unit, flags, TRUE))
  	cp->cn_pri = CN_DEAD;
  
      /* syscons will become console even when there is no keyboard */
      sckbdprobe(unit, flags, TRUE);
  
      if (cp->cn_pri == CN_DEAD)
  	return;
  
      /* initialize required fields */
      strcpy(cp->cn_name, "ttyv0");
  }
  
  static void
  sc_cninit(struct consdev *cp)
  {
      int unit;
      int flags;
  
      sc_get_cons_priority(&unit, &flags);
      scinit(unit, flags | SC_KERNEL_CONSOLE);
      sc_console_unit = unit;
      sc_console = sc_get_stat(sc_get_softc(unit, SC_KERNEL_CONSOLE)->dev[0]);
      sc_consptr = cp;
  }
  
  static void
  sc_cnterm(struct consdev *cp)
  {
      /* we are not the kernel console any more, release everything */
  
      if (sc_console_unit < 0)
  	return;			/* shouldn't happen */
  
  #if 0 /* XXX */
      sc_clear_screen(sc_console);
      sccnupdate(sc_console);
  #endif
  
      scterm(sc_console_unit, SC_KERNEL_CONSOLE);
      sc_console_unit = -1;
      sc_console = NULL;
  }
  
  static void
  sc_cngrab(struct consdev *cp)
  {
      scr_stat *scp;
  
      if (!cold &&
  	sc_console->sc->cur_scp->index != sc_console->index &&
  	sc_console->sc->cur_scp->smode.mode == VT_AUTO &&
  	sc_console->smode.mode == VT_AUTO)
  	    sc_switch_scr(sc_console->sc, sc_console->index);
  
      scp = sc_console->sc->cur_scp;
  
      if (scp->sc->kbd == NULL)
  	return;
  
      if (scp->grabbed++ > 0)
  	return;
  
      /*
       * Make sure the keyboard is accessible even when the kbd device
       * driver is disabled.
       */
      kbdd_enable(scp->sc->kbd);
  
      /* we shall always use the keyboard in the XLATE mode here */
      scp->kbd_prev_mode = scp->kbd_mode;
      scp->kbd_mode = K_XLATE;
      (void)kbdd_ioctl(scp->sc->kbd, KDSKBMODE, (caddr_t)&scp->kbd_mode);
  
      kbdd_poll(scp->sc->kbd, TRUE);
  }
  
  static void
  sc_cnungrab(struct consdev *cp)
  {
      scr_stat *scp;
  
      scp = sc_console->sc->cur_scp;	/* XXX */
      if (scp->sc->kbd == NULL)
  	return;
  
      if (--scp->grabbed > 0)
  	return;
  
      kbdd_poll(scp->sc->kbd, FALSE);
  
      scp->kbd_mode = scp->kbd_prev_mode;
      (void)kbdd_ioctl(scp->sc->kbd, KDSKBMODE, (caddr_t)&scp->kbd_mode);
      kbdd_disable(scp->sc->kbd);
  }
  
  static void
  sc_cnputc(struct consdev *cd, int c)
  {
      u_char buf[1];
      scr_stat *scp = sc_console;
  #ifndef SC_NO_HISTORY
  #if 0
      struct tty *tp;
  #endif
  #endif /* !SC_NO_HISTORY */
      int s;
  
      /* assert(sc_console != NULL) */
  
  #ifndef SC_NO_HISTORY
      if (scp == scp->sc->cur_scp && scp->status & SLKED) {
  	scp->status &= ~SLKED;
  	update_kbd_state(scp, scp->status, SLKED);
  	if (scp->status & BUFFER_SAVED) {
  	    if (!sc_hist_restore(scp))
  		sc_remove_cutmarking(scp);
  	    scp->status &= ~BUFFER_SAVED;
  	    scp->status |= CURSOR_ENABLED;
  	    sc_draw_cursor_image(scp);
  	}
  #if 0
  	/*
  	 * XXX: Now that TTY's have their own locks, we cannot process
  	 * any data after disabling scroll lock. cnputs already holds a
  	 * spinlock.
  	 */
  	tp = SC_DEV(scp->sc, scp->index);
  	/* XXX "tp" can be NULL */
  	tty_lock(tp);
  	if (tty_opened(tp))
  	    sctty_outwakeup(tp);
  	tty_unlock(tp);
  #endif
      }
  #endif /* !SC_NO_HISTORY */
  
      buf[0] = c;
      sc_puts(scp, buf, 1, 1);
  
      s = spltty();	/* block sckbdevent and scrn_timer */
      sccnupdate(scp);
      splx(s);
  }
  
  static int
  sc_cngetc(struct consdev *cd)
  {
      static struct fkeytab fkey;
      static int fkeycp;
      scr_stat *scp;
      const u_char *p;
      int s = spltty();	/* block sckbdevent and scrn_timer while we poll */
      int c;
  
      /* assert(sc_console != NULL) */
  
      /* 
       * Stop the screen saver and update the screen if necessary.
       * What if we have been running in the screen saver code... XXX
       */
      sc_touch_scrn_saver();
      scp = sc_console->sc->cur_scp;	/* XXX */
      sccnupdate(scp);
  
      if (fkeycp < fkey.len) {
  	splx(s);
  	return fkey.str[fkeycp++];
      }
  
      if (scp->sc->kbd == NULL) {
  	splx(s);
  	return -1;
      }
  
      c = scgetc(scp->sc, SCGETC_CN | SCGETC_NONBLOCK);
  
      switch (KEYFLAGS(c)) {
      case 0:	/* normal char */
  	return KEYCHAR(c);
      case FKEY:	/* function key */
  	p = (*scp->tsw->te_fkeystr)(scp, c);
  	if (p != NULL) {
  	    fkey.len = strlen(p);
  	    bcopy(p, fkey.str, fkey.len);
  	    fkeycp = 1;
  	    return fkey.str[0];
  	}
  	p = kbdd_get_fkeystr(scp->sc->kbd, KEYCHAR(c), (size_t *)&fkeycp);
  	fkey.len = fkeycp;
  	if ((p != NULL) && (fkey.len > 0)) {
  	    bcopy(p, fkey.str, fkey.len);
  	    fkeycp = 1;
  	    return fkey.str[0];
  	}
  	return c;	/* XXX */
      case NOKEY:
      case ERRKEY:
      default:
  	return -1;
      }
      /* NOT REACHED */
  }
  
  static void
  sccnupdate(scr_stat *scp)
  {
      /* this is a cut-down version of scrn_timer()... */
  
      if (suspend_in_progress || scp->sc->font_loading_in_progress)
  	return;
  
      if (debugger > 0 || panicstr || shutdown_in_progress) {
  	sc_touch_scrn_saver();
      } else if (scp != scp->sc->cur_scp) {
  	return;
      }
  
      if (!run_scrn_saver)
  	scp->sc->flags &= ~SC_SCRN_IDLE;
  #ifdef DEV_SPLASH
      if ((saver_mode != CONS_LKM_SAVER) || !(scp->sc->flags & SC_SCRN_IDLE))
  	if (scp->sc->flags & SC_SCRN_BLANKED)
              stop_scrn_saver(scp->sc, current_saver);
  #endif
  
      if (scp != scp->sc->cur_scp || scp->sc->blink_in_progress
  	|| scp->sc->switch_in_progress)
  	return;
      /*
       * FIXME: unlike scrn_timer(), we call scrn_update() from here even
       * when write_in_progress is non-zero.  XXX
       */
  
      if (!ISGRAPHSC(scp) && !(scp->sc->flags & SC_SCRN_BLANKED))
  	scrn_update(scp, TRUE);
  }
  
  static void
  scrn_timer(void *arg)
  {
  #ifndef PC98
      static time_t kbd_time_stamp = 0;
  #endif
      sc_softc_t *sc;
      scr_stat *scp;
      int again, rate;
  
      again = (arg != NULL);
      if (arg != NULL)
  	sc = (sc_softc_t *)arg;
      else if (sc_console != NULL)
  	sc = sc_console->sc;
      else
  	return;
  
      /* find the vty to update */
      scp = sc->cur_scp;
  
      /* don't do anything when we are performing some I/O operations */
      if (suspend_in_progress || sc->font_loading_in_progress)
  	goto done;
  
  #ifndef PC98
      if ((sc->kbd == NULL) && (sc->config & SC_AUTODETECT_KBD)) {
  	/* try to allocate a keyboard automatically */
  	if (kbd_time_stamp != time_uptime) {
  	    kbd_time_stamp = time_uptime;
  	    sc->keyboard = sc_allocate_keyboard(sc, -1);
  	    if (sc->keyboard >= 0) {
  		sc->kbd = kbd_get_keyboard(sc->keyboard);
  		(void)kbdd_ioctl(sc->kbd, KDSKBMODE,
  			  (caddr_t)&sc->cur_scp->kbd_mode);
  		update_kbd_state(sc->cur_scp, sc->cur_scp->status,
  				 LOCK_MASK);
  	    }
  	}
      }
  #endif /* PC98 */
  
      /* should we stop the screen saver? */
      if (debugger > 0 || panicstr || shutdown_in_progress)
  	sc_touch_scrn_saver();
      if (run_scrn_saver) {
  	if (time_uptime > sc->scrn_time_stamp + scrn_blank_time)
  	    sc->flags |= SC_SCRN_IDLE;
  	else
  	    sc->flags &= ~SC_SCRN_IDLE;
      } else {
  	sc->scrn_time_stamp = time_uptime;
  	sc->flags &= ~SC_SCRN_IDLE;
  	if (scrn_blank_time > 0)
  	    run_scrn_saver = TRUE;
      }
  #ifdef DEV_SPLASH
      if ((saver_mode != CONS_LKM_SAVER) || !(sc->flags & SC_SCRN_IDLE))
  	if (sc->flags & SC_SCRN_BLANKED)
              stop_scrn_saver(sc, current_saver);
  #endif
  
      /* should we just return ? */
      if (sc->blink_in_progress || sc->switch_in_progress
  	|| sc->write_in_progress)
  	goto done;
  
      /* Update the screen */
      scp = sc->cur_scp;		/* cur_scp may have changed... */
      if (!ISGRAPHSC(scp) && !(sc->flags & SC_SCRN_BLANKED))
  	scrn_update(scp, TRUE);
  
  #ifdef DEV_SPLASH
      /* should we activate the screen saver? */
      if ((saver_mode == CONS_LKM_SAVER) && (sc->flags & SC_SCRN_IDLE))
  	if (!ISGRAPHSC(scp) || (sc->flags & SC_SCRN_BLANKED))
  	    (*current_saver)(sc, TRUE);
  #endif
  
  done:
      if (again) {
  	/*
  	 * Use reduced "refresh" rate if we are in graphics and that is not a
  	 * graphical screen saver.  In such case we just have nothing to do.
  	 */
  	if (ISGRAPHSC(scp) && !(sc->flags & SC_SCRN_BLANKED))
  	    rate = 2;
  	else
  	    rate = 30;
  	callout_reset_sbt(&sc->ctimeout, SBT_1S / rate, 0,
  	    scrn_timer, sc, C_PREL(1));
      }
  }
  
  static int
  and_region(int *s1, int *e1, int s2, int e2)
  {
      if (*e1 < s2 || e2 < *s1)
  	return FALSE;
      *s1 = imax(*s1, s2);
      *e1 = imin(*e1, e2);
      return TRUE;
  }
  
  static void 
  scrn_update(scr_stat *scp, int show_cursor)
  {
      int start;
      int end;
      int s;
      int e;
  
      /* assert(scp == scp->sc->cur_scp) */
  
      SC_VIDEO_LOCK(scp->sc);
  
  #ifndef SC_NO_CUTPASTE
      /* remove the previous mouse pointer image if necessary */
      if (scp->status & MOUSE_VISIBLE) {
  	s = scp->mouse_pos;
  	e = scp->mouse_pos + scp->xsize + 1;
  	if ((scp->status & (MOUSE_MOVED | MOUSE_HIDDEN))
  	    || and_region(&s, &e, scp->start, scp->end)
  	    || ((scp->status & CURSOR_ENABLED) && 
  		(scp->cursor_pos != scp->cursor_oldpos) &&
  		(and_region(&s, &e, scp->cursor_pos, scp->cursor_pos)
  		 || and_region(&s, &e, scp->cursor_oldpos, scp->cursor_oldpos)))) {
  	    sc_remove_mouse_image(scp);
  	    if (scp->end >= scp->xsize*scp->ysize)
  		scp->end = scp->xsize*scp->ysize - 1;
  	}
      }
  #endif /* !SC_NO_CUTPASTE */
  
  #if 1
      /* debug: XXX */
      if (scp->end >= scp->xsize*scp->ysize) {
  	printf("scrn_update(): scp->end %d > size_of_screen!!\n", scp->end);
  	scp->end = scp->xsize*scp->ysize - 1;
      }
      if (scp->start < 0) {
  	printf("scrn_update(): scp->start %d < 0\n", scp->start);
  	scp->start = 0;
      }
  #endif
  
      /* update screen image */
      if (scp->start <= scp->end)  {
  	if (scp->mouse_cut_end >= 0) {
  	    /* there is a marked region for cut & paste */
  	    if (scp->mouse_cut_start <= scp->mouse_cut_end) {
  		start = scp->mouse_cut_start;
  		end = scp->mouse_cut_end;
  	    } else {
  		start = scp->mouse_cut_end;
  		end = scp->mouse_cut_start - 1;
  	    }
  	    s = start;
  	    e = end;
  	    /* does the cut-mark region overlap with the update region? */
  	    if (and_region(&s, &e, scp->start, scp->end)) {
  		(*scp->rndr->draw)(scp, s, e - s + 1, TRUE);
  		s = 0;
  		e = start - 1;
  		if (and_region(&s, &e, scp->start, scp->end))
  		    (*scp->rndr->draw)(scp, s, e - s + 1, FALSE);
  		s = end + 1;
  		e = scp->xsize*scp->ysize - 1;
  		if (and_region(&s, &e, scp->start, scp->end))
  		    (*scp->rndr->draw)(scp, s, e - s + 1, FALSE);
  	    } else {
  		(*scp->rndr->draw)(scp, scp->start,
  				   scp->end - scp->start + 1, FALSE);
  	    }
  	} else {
  	    (*scp->rndr->draw)(scp, scp->start,
  			       scp->end - scp->start + 1, FALSE);
  	}
      }
  
      /* we are not to show the cursor and the mouse pointer... */
      if (!show_cursor) {
          scp->end = 0;
          scp->start = scp->xsize*scp->ysize - 1;
  	SC_VIDEO_UNLOCK(scp->sc);
  	return;
      }
  
      /* update cursor image */
      if (scp->status & CURSOR_ENABLED) {
  	s = scp->start;
  	e = scp->end;
          /* did cursor move since last time ? */
          if (scp->cursor_pos != scp->cursor_oldpos) {
              /* do we need to remove old cursor image ? */
              if (!and_region(&s, &e, scp->cursor_oldpos, scp->cursor_oldpos))
                  sc_remove_cursor_image(scp);
              sc_draw_cursor_image(scp);
          } else {
              if (and_region(&s, &e, scp->cursor_pos, scp->cursor_pos))
  		/* cursor didn't move, but has been overwritten */
  		sc_draw_cursor_image(scp);
  	    else if (scp->curs_attr.flags & CONS_BLINK_CURSOR)
  		/* if it's a blinking cursor, update it */
  		(*scp->rndr->blink_cursor)(scp, scp->cursor_pos,
  					   sc_inside_cutmark(scp,
  					       scp->cursor_pos));
          }
      }
  
  #ifndef SC_NO_CUTPASTE
      /* update "pseudo" mouse pointer image */
      if (scp->sc->flags & SC_MOUSE_ENABLED) {
  	if (!(scp->status & (MOUSE_VISIBLE | MOUSE_HIDDEN))) {
  	    scp->status &= ~MOUSE_MOVED;
  	    sc_draw_mouse_image(scp);
  	}
      }
  #endif /* SC_NO_CUTPASTE */
  
      scp->end = 0;
      scp->start = scp->xsize*scp->ysize - 1;
  
      SC_VIDEO_UNLOCK(scp->sc);
  }
  
  #ifdef DEV_SPLASH
  static int
  scsplash_callback(int event, void *arg)
  {
      sc_softc_t *sc;
      int error;
  
      sc = (sc_softc_t *)arg;
  
      switch (event) {
      case SPLASH_INIT:
  	if (add_scrn_saver(scsplash_saver) == 0) {
  	    sc->flags &= ~SC_SAVER_FAILED;
  	    run_scrn_saver = TRUE;
  	    if (cold && !(boothowto & RB_VERBOSE)) {
  		scsplash_stick(TRUE);
  		(*current_saver)(sc, TRUE);
  	    }
  	}
  	return 0;
  
      case SPLASH_TERM:
  	if (current_saver == scsplash_saver) {
  	    scsplash_stick(FALSE);
  	    error = remove_scrn_saver(scsplash_saver);
  	    if (error)
  		return error;
  	}
  	return 0;
  
      default:
  	return EINVAL;
      }
  }
  
  static void
  scsplash_saver(sc_softc_t *sc, int show)
  {
      static int busy = FALSE;
      scr_stat *scp;
  
      if (busy)
  	return;
      busy = TRUE;
  
      scp = sc->cur_scp;
      if (show) {
  	if (!(sc->flags & SC_SAVER_FAILED)) {
  	    if (!(sc->flags & SC_SCRN_BLANKED))
  		set_scrn_saver_mode(scp, -1, NULL, 0);
  	    switch (splash(sc->adp, TRUE)) {
  	    case 0:		/* succeeded */
  		break;
  	    case EAGAIN:	/* try later */
  		restore_scrn_saver_mode(scp, FALSE);
  		sc_touch_scrn_saver();		/* XXX */
  		break;
  	    default:
  		sc->flags |= SC_SAVER_FAILED;
  		scsplash_stick(FALSE);
  		restore_scrn_saver_mode(scp, TRUE);
  		printf("scsplash_saver(): failed to put up the image\n");
  		break;
  	    }
  	}
      } else if (!sticky_splash) {
  	if ((sc->flags & SC_SCRN_BLANKED) && (splash(sc->adp, FALSE) == 0))
  	    restore_scrn_saver_mode(scp, TRUE);
      }
      busy = FALSE;
  }
  
  static int
  add_scrn_saver(void (*this_saver)(sc_softc_t *, int))
  {
  #if 0
      int error;
  
      if (current_saver != none_saver) {
  	error = remove_scrn_saver(current_saver);
  	if (error)
  	    return error;
      }
  #endif
      if (current_saver != none_saver)
  	return EBUSY;
  
      run_scrn_saver = FALSE;
      saver_mode = CONS_LKM_SAVER;
      current_saver = this_saver;
      return 0;
  }
  
  static int
  remove_scrn_saver(void (*this_saver)(sc_softc_t *, int))
  {
      if (current_saver != this_saver)
  	return EINVAL;
  
  #if 0
      /*
       * In order to prevent `current_saver' from being called by
       * the timeout routine `scrn_timer()' while we manipulate 
       * the saver list, we shall set `current_saver' to `none_saver' 
       * before stopping the current saver, rather than blocking by `splXX()'.
       */
      current_saver = none_saver;
      if (scrn_blanked)
          stop_scrn_saver(this_saver);
  #endif
  
      /* unblank all blanked screens */
      wait_scrn_saver_stop(NULL);
      if (scrn_blanked)
  	return EBUSY;
  
      current_saver = none_saver;
      return 0;
  }
  
  static int
  set_scrn_saver_mode(scr_stat *scp, int mode, u_char *pal, int border)
  {
      int s;
  
      /* assert(scp == scp->sc->cur_scp) */
      s = spltty();
      if (!ISGRAPHSC(scp))
  	sc_remove_cursor_image(scp);
      scp->splash_save_mode = scp->mode;
      scp->splash_save_status = scp->status & (GRAPHICS_MODE | PIXEL_MODE);
      scp->status &= ~(GRAPHICS_MODE | PIXEL_MODE);
      scp->status |= (UNKNOWN_MODE | SAVER_RUNNING);
      scp->sc->flags |= SC_SCRN_BLANKED;
      ++scrn_blanked;
      splx(s);
      if (mode < 0)
  	return 0;
      scp->mode = mode;
      if (set_mode(scp) == 0) {
  	if (scp->sc->adp->va_info.vi_flags & V_INFO_GRAPHICS)
  	    scp->status |= GRAPHICS_MODE;
  #ifndef SC_NO_PALETTE_LOADING
  	if (pal != NULL)
  	    vidd_load_palette(scp->sc->adp, pal);
  #endif
  	sc_set_border(scp, border);
  	return 0;
      } else {
  	s = spltty();
  	scp->mode = scp->splash_save_mode;
  	scp->status &= ~(UNKNOWN_MODE | SAVER_RUNNING);
  	scp->status |= scp->splash_save_status;
  	splx(s);
  	return 1;
      }
  }
  
  static int
  restore_scrn_saver_mode(scr_stat *scp, int changemode)
  {
      int mode;
      int status;
      int s;
  
      /* assert(scp == scp->sc->cur_scp) */
      s = spltty();
      mode = scp->mode;
      status = scp->status;
      scp->mode = scp->splash_save_mode;
      scp->status &= ~(UNKNOWN_MODE | SAVER_RUNNING);
      scp->status |= scp->splash_save_status;
      scp->sc->flags &= ~SC_SCRN_BLANKED;
      if (!changemode) {
  	if (!ISGRAPHSC(scp))
  	    sc_draw_cursor_image(scp);
  	--scrn_blanked;
  	splx(s);
  	return 0;
      }
      if (set_mode(scp) == 0) {
  #ifndef SC_NO_PALETTE_LOADING
  #ifdef SC_PIXEL_MODE
  	if (scp->sc->adp->va_info.vi_mem_model == V_INFO_MM_DIRECT)
  	    vidd_load_palette(scp->sc->adp, scp->sc->palette2);
  	else
  #endif
  	vidd_load_palette(scp->sc->adp, scp->sc->palette);
  #endif
  	--scrn_blanked;
  	splx(s);
  	return 0;
      } else {
  	scp->mode = mode;
  	scp->status = status;
  	splx(s);
  	return 1;
      }
  }
  
  static void
  stop_scrn_saver(sc_softc_t *sc, void (*saver)(sc_softc_t *, int))
  {
      (*saver)(sc, FALSE);
      run_scrn_saver = FALSE;
      /* the screen saver may have chosen not to stop after all... */
      if (sc->flags & SC_SCRN_BLANKED)
  	return;
  
      mark_all(sc->cur_scp);
      if (sc->delayed_next_scr)
  	sc_switch_scr(sc, sc->delayed_next_scr - 1);
      if (debugger == 0)
  	wakeup(&scrn_blanked);
  }
  
  static int
  wait_scrn_saver_stop(sc_softc_t *sc)
  {
      int error = 0;
  
      while (scrn_blanked > 0) {
  	run_scrn_saver = FALSE;
  	if (sc && !(sc->flags & SC_SCRN_BLANKED)) {
  	    error = 0;
  	    break;
  	}
  	error = tsleep(&scrn_blanked, PZERO | PCATCH, "scrsav", 0);
  	if ((error != 0) && (error != ERESTART))
  	    break;
      }
      run_scrn_saver = FALSE;
      return error;
  }
  #endif /* DEV_SPLASH */
  
  void
  sc_touch_scrn_saver(void)
  {
      scsplash_stick(FALSE);
      run_scrn_saver = FALSE;
  }
  
  int
  sc_switch_scr(sc_softc_t *sc, u_int next_scr)
  {
      scr_stat *cur_scp;
      struct tty *tp;
      struct proc *p;
      int s;
  
      DPRINTF(5, ("sc0: sc_switch_scr() %d ", next_scr + 1));
  
      if (sc->cur_scp == NULL)
  	return (0);
  
      /* prevent switch if previously requested */
      if (sc->flags & SC_SCRN_VTYLOCK) {
  	    sc_bell(sc->cur_scp, sc->cur_scp->bell_pitch,
  		sc->cur_scp->bell_duration);
  	    return EPERM;
      }
  
      /* delay switch if the screen is blanked or being updated */
      if ((sc->flags & SC_SCRN_BLANKED) || sc->write_in_progress
  	|| sc->blink_in_progress) {
  	sc->delayed_next_scr = next_scr + 1;
  	sc_touch_scrn_saver();
  	DPRINTF(5, ("switch delayed\n"));
  	return 0;
      }
      sc->delayed_next_scr = 0;
  
      s = spltty();
      cur_scp = sc->cur_scp;
  
      /* we are in the middle of the vty switching process... */
      if (sc->switch_in_progress
  	&& (cur_scp->smode.mode == VT_PROCESS)
  	&& cur_scp->proc) {
  	p = pfind(cur_scp->pid);
  	if (cur_scp->proc != p) {
  	    if (p)
  		PROC_UNLOCK(p);
  	    /* 
  	     * The controlling process has died!!.  Do some clean up.
  	     * NOTE:`cur_scp->proc' and `cur_scp->smode.mode' 
  	     * are not reset here yet; they will be cleared later.
  	     */
  	    DPRINTF(5, ("cur_scp controlling process %d died, ",
  	       cur_scp->pid));
  	    if (cur_scp->status & SWITCH_WAIT_REL) {
  		/*
  		 * Force the previous switch to finish, but return now 
  		 * with error.
  		 */
  		DPRINTF(5, ("reset WAIT_REL, "));
  		finish_vt_rel(cur_scp, TRUE, &s);
  		splx(s);
  		DPRINTF(5, ("finishing previous switch\n"));
  		return EINVAL;
  	    } else if (cur_scp->status & SWITCH_WAIT_ACQ) {
  		/* let's assume screen switch has been completed. */
  		DPRINTF(5, ("reset WAIT_ACQ, "));
  		finish_vt_acq(cur_scp);
  	    } else {
  		/* 
  	 	 * We are in between screen release and acquisition, and
  		 * reached here via scgetc() or scrn_timer() which has 
  		 * interrupted exchange_scr(). Don't do anything stupid.
  		 */
  		DPRINTF(5, ("waiting nothing, "));
  	    }
  	} else {
  	    if (p)
  		PROC_UNLOCK(p);
  	    /*
  	     * The controlling process is alive, but not responding... 
  	     * It is either buggy or it may be just taking time.
  	     * The following code is a gross kludge to cope with this
  	     * problem for which there is no clean solution. XXX
  	     */
  	    if (cur_scp->status & SWITCH_WAIT_REL) {
  		switch (sc->switch_in_progress++) {
  		case 1:
  		    break;
  		case 2:
  		    DPRINTF(5, ("sending relsig again, "));
  		    signal_vt_rel(cur_scp);
  		    break;
  		case 3:
  		    break;
  		case 4:
  		default:
  		    /*
  		     * Act as if the controlling program returned
  		     * VT_FALSE.
  		     */
  		    DPRINTF(5, ("force reset WAIT_REL, "));
  		    finish_vt_rel(cur_scp, FALSE, &s);
  		    splx(s);
  		    DPRINTF(5, ("act as if VT_FALSE was seen\n"));
  		    return EINVAL;
  		}
  	    } else if (cur_scp->status & SWITCH_WAIT_ACQ) {
  		switch (sc->switch_in_progress++) {
  		case 1:
  		    break;
  		case 2:
  		    DPRINTF(5, ("sending acqsig again, "));
  		    signal_vt_acq(cur_scp);
  		    break;
  		case 3:
  		    break;
  		case 4:
  		default:
  		     /* clear the flag and finish the previous switch */
  		    DPRINTF(5, ("force reset WAIT_ACQ, "));
  		    finish_vt_acq(cur_scp);
  		    break;
  		}
  	    }
  	}
      }
  
      /*
       * Return error if an invalid argument is given, or vty switch
       * is still in progress.
       */
      if ((next_scr < sc->first_vty) || (next_scr >= sc->first_vty + sc->vtys)
  	|| sc->switch_in_progress) {
  	splx(s);
  	sc_bell(cur_scp, bios_value.bell_pitch, BELL_DURATION);
  	DPRINTF(5, ("error 1\n"));
  	return EINVAL;
      }
  
      /*
       * Don't allow switching away from the graphics mode vty
       * if the switch mode is VT_AUTO, unless the next vty is the same 
       * as the current or the current vty has been closed (but showing).
       */
      tp = SC_DEV(sc, cur_scp->index);
      if ((cur_scp->index != next_scr)
  	&& tty_opened_ns(tp)
  	&& (cur_scp->smode.mode == VT_AUTO)
  	&& ISGRAPHSC(cur_scp)) {
  	splx(s);
  	sc_bell(cur_scp, bios_value.bell_pitch, BELL_DURATION);
  	DPRINTF(5, ("error, graphics mode\n"));
  	return EINVAL;
      }
  
      /*
       * Is the wanted vty open? Don't allow switching to a closed vty.
       * If we are in DDB, don't switch to a vty in the VT_PROCESS mode.
       * Note that we always allow the user to switch to the kernel 
       * console even if it is closed.
       */
      if ((sc_console == NULL) || (next_scr != sc_console->index)) {
  	tp = SC_DEV(sc, next_scr);
  	if (!tty_opened_ns(tp)) {
  	    splx(s);
  	    sc_bell(cur_scp, bios_value.bell_pitch, BELL_DURATION);
  	    DPRINTF(5, ("error 2, requested vty isn't open!\n"));
  	    return EINVAL;
  	}
  	if ((debugger > 0) && (SC_STAT(tp)->smode.mode == VT_PROCESS)) {
  	    splx(s);
  	    DPRINTF(5, ("error 3, requested vty is in the VT_PROCESS mode\n"));
  	    return EINVAL;
  	}
      }
  
      /* this is the start of vty switching process... */
      ++sc->switch_in_progress;
      sc->old_scp = cur_scp;
      sc->new_scp = sc_get_stat(SC_DEV(sc, next_scr));
      if (sc->new_scp == sc->old_scp) {
  	sc->switch_in_progress = 0;
  	/*
  	 * XXX wakeup() locks the scheduler lock which will hang if
  	 * the lock is in an in-between state, e.g., when we stop at
  	 * a breakpoint at fork_exit.  It has always been wrong to call
  	 * wakeup() when the debugger is active.  In RELENG_4, wakeup()
  	 * is supposed to be locked by splhigh(), but the debugger may
  	 * be invoked at splhigh().
  	 */
  	if (debugger == 0)
  	    wakeup(VTY_WCHAN(sc,next_scr));
  	splx(s);
  	DPRINTF(5, ("switch done (new == old)\n"));
  	return 0;
      }
  
      /* has controlling process died? */
      vt_proc_alive(sc->old_scp);
      vt_proc_alive(sc->new_scp);
  
      /* wait for the controlling process to release the screen, if necessary */
      if (signal_vt_rel(sc->old_scp)) {
  	splx(s);
  	return 0;
      }
  
      /* go set up the new vty screen */
      splx(s);
      exchange_scr(sc);
      s = spltty();
  
      /* wake up processes waiting for this vty */
      if (debugger == 0)
  	wakeup(VTY_WCHAN(sc,next_scr));
  
      /* wait for the controlling process to acknowledge, if necessary */
      if (signal_vt_acq(sc->cur_scp)) {
  	splx(s);
  	return 0;
      }
  
      sc->switch_in_progress = 0;
      if (sc->unit == sc_console_unit)
  	cnavailable(sc_consptr,  TRUE);
      splx(s);
      DPRINTF(5, ("switch done\n"));
  
      return 0;
  }
  
  static int
  do_switch_scr(sc_softc_t *sc, int s)
  {
      vt_proc_alive(sc->new_scp);
  
      splx(s);
      exchange_scr(sc);
      s = spltty();
      /* sc->cur_scp == sc->new_scp */
      wakeup(VTY_WCHAN(sc,sc->cur_scp->index));
  
      /* wait for the controlling process to acknowledge, if necessary */
      if (!signal_vt_acq(sc->cur_scp)) {
  	sc->switch_in_progress = 0;
  	if (sc->unit == sc_console_unit)
  	    cnavailable(sc_consptr,  TRUE);
      }
  
      return s;
  }
  
  static int
  vt_proc_alive(scr_stat *scp)
  {
      struct proc *p;
  
      if (scp->proc) {
  	if ((p = pfind(scp->pid)) != NULL)
  	    PROC_UNLOCK(p);
  	if (scp->proc == p)
  	    return TRUE;
  	scp->proc = NULL;
  	scp->smode.mode = VT_AUTO;
  	DPRINTF(5, ("vt controlling process %d died\n", scp->pid));
      }
      return FALSE;
  }
  
  static int
  signal_vt_rel(scr_stat *scp)
  {
      if (scp->smode.mode != VT_PROCESS)
  	return FALSE;
      scp->status |= SWITCH_WAIT_REL;
      PROC_LOCK(scp->proc);
      kern_psignal(scp->proc, scp->smode.relsig);
      PROC_UNLOCK(scp->proc);
      DPRINTF(5, ("sending relsig to %d\n", scp->pid));
      return TRUE;
  }
  
  static int
  signal_vt_acq(scr_stat *scp)
  {
      if (scp->smode.mode != VT_PROCESS)
  	return FALSE;
      if (scp->sc->unit == sc_console_unit)
  	cnavailable(sc_consptr,  FALSE);
      scp->status |= SWITCH_WAIT_ACQ;
      PROC_LOCK(scp->proc);
      kern_psignal(scp->proc, scp->smode.acqsig);
      PROC_UNLOCK(scp->proc);
      DPRINTF(5, ("sending acqsig to %d\n", scp->pid));
      return TRUE;
  }
  
  static int
  finish_vt_rel(scr_stat *scp, int release, int *s)
  {
      if (scp == scp->sc->old_scp && scp->status & SWITCH_WAIT_REL) {
  	scp->status &= ~SWITCH_WAIT_REL;
  	if (release)
  	    *s = do_switch_scr(scp->sc, *s);
  	else
  	    scp->sc->switch_in_progress = 0;
  	return 0;
      }
      return EINVAL;
  }
  
  static int
  finish_vt_acq(scr_stat *scp)
  {
      if (scp == scp->sc->new_scp && scp->status & SWITCH_WAIT_ACQ) {
  	scp->status &= ~SWITCH_WAIT_ACQ;
  	scp->sc->switch_in_progress = 0;
  	return 0;
      }
      return EINVAL;
  }
  
  static void
  exchange_scr(sc_softc_t *sc)
  {
      scr_stat *scp;
  
      /* save the current state of video and keyboard */
      sc_move_cursor(sc->old_scp, sc->old_scp->xpos, sc->old_scp->ypos);
      if (!ISGRAPHSC(sc->old_scp))
  	sc_remove_cursor_image(sc->old_scp);
      if (sc->old_scp->kbd_mode == K_XLATE)
  	save_kbd_state(sc->old_scp);
  
      /* set up the video for the new screen */
      scp = sc->cur_scp = sc->new_scp;
  #ifdef PC98
      if (sc->old_scp->mode != scp->mode || ISUNKNOWNSC(sc->old_scp) || ISUNKNOWNSC(sc->new_scp))
  #else
      if (sc->old_scp->mode != scp->mode || ISUNKNOWNSC(sc->old_scp))
  #endif
  	set_mode(scp);
  #ifndef __sparc64__
      else
  	sc_vtb_init(&scp->scr, VTB_FRAMEBUFFER, scp->xsize, scp->ysize,
  		    (void *)sc->adp->va_window, FALSE);
  #endif
      scp->status |= MOUSE_HIDDEN;
      sc_move_cursor(scp, scp->xpos, scp->ypos);
      if (!ISGRAPHSC(scp))
  	sc_set_cursor_image(scp);
  #ifndef SC_NO_PALETTE_LOADING
      if (ISGRAPHSC(sc->old_scp)) {
  #ifdef SC_PIXEL_MODE
  	if (sc->adp->va_info.vi_mem_model == V_INFO_MM_DIRECT)
  	    vidd_load_palette(sc->adp, sc->palette2);
  	else
  #endif
  	vidd_load_palette(sc->adp, sc->palette);
      }
  #endif
      sc_set_border(scp, scp->border);
  
      /* set up the keyboard for the new screen */
      if (sc->old_scp->kbd_mode != scp->kbd_mode)
  	(void)kbdd_ioctl(sc->kbd, KDSKBMODE, (caddr_t)&scp->kbd_mode);
      update_kbd_state(scp, scp->status, LOCK_MASK);
  
      mark_all(scp);
  }
  
  static void
  sc_puts(scr_stat *scp, u_char *buf, int len, int kernel)
  {
      int need_unlock = 0;
  
  #ifdef DEV_SPLASH
      /* make screensaver happy */
      if (!sticky_splash && scp == scp->sc->cur_scp && !sc_saver_keyb_only)
  	run_scrn_saver = FALSE;
  #endif
  
      if (scp->tsw) {
  	if (!kdb_active && !mtx_owned(&scp->scr_lock)) {
  		need_unlock = 1;
  		mtx_lock_spin(&scp->scr_lock);
  	}
  	(*scp->tsw->te_puts)(scp, buf, len, kernel);
  	if (need_unlock)
  		mtx_unlock_spin(&scp->scr_lock);
      }
  
      if (scp->sc->delayed_next_scr)
  	sc_switch_scr(scp->sc, scp->sc->delayed_next_scr - 1);
  }
  
  void
  sc_draw_cursor_image(scr_stat *scp)
  {
      /* assert(scp == scp->sc->cur_scp); */
      SC_VIDEO_LOCK(scp->sc);
      (*scp->rndr->draw_cursor)(scp, scp->cursor_pos,
  			      scp->curs_attr.flags & CONS_BLINK_CURSOR, TRUE,
  			      sc_inside_cutmark(scp, scp->cursor_pos));
      scp->cursor_oldpos = scp->cursor_pos;
      SC_VIDEO_UNLOCK(scp->sc);
  }
  
  void
  sc_remove_cursor_image(scr_stat *scp)
  {
      /* assert(scp == scp->sc->cur_scp); */
      SC_VIDEO_LOCK(scp->sc);
      (*scp->rndr->draw_cursor)(scp, scp->cursor_oldpos,
  			      scp->curs_attr.flags & CONS_BLINK_CURSOR, FALSE,
  			      sc_inside_cutmark(scp, scp->cursor_oldpos));
      SC_VIDEO_UNLOCK(scp->sc);
  }
  
  static void
  update_cursor_image(scr_stat *scp)
  {
      /* assert(scp == scp->sc->cur_scp); */
      sc_remove_cursor_image(scp);
      sc_set_cursor_image(scp);
      sc_draw_cursor_image(scp);
  }
  
  void
  sc_set_cursor_image(scr_stat *scp)
  {
      scp->curs_attr.flags = scp->curr_curs_attr.flags;
      if (scp->curs_attr.flags & CONS_HIDDEN_CURSOR) {
  	/* hidden cursor is internally represented as zero-height underline */
  	scp->curs_attr.flags = CONS_CHAR_CURSOR;
  	scp->curs_attr.base = scp->curs_attr.height = 0;
      } else if (scp->curs_attr.flags & CONS_CHAR_CURSOR) {
  	scp->curs_attr.base = imin(scp->curr_curs_attr.base,
  				  scp->font_size - 1);
  	scp->curs_attr.height = imin(scp->curr_curs_attr.height,
  				    scp->font_size - scp->curs_attr.base);
      } else {	/* block cursor */
  	scp->curs_attr.base = 0;
  	scp->curs_attr.height = scp->font_size;
      }
  
      /* assert(scp == scp->sc->cur_scp); */
      SC_VIDEO_LOCK(scp->sc);
      (*scp->rndr->set_cursor)(scp, scp->curs_attr.base, scp->curs_attr.height,
  			     scp->curs_attr.flags & CONS_BLINK_CURSOR);
      SC_VIDEO_UNLOCK(scp->sc);
  }
  
  static void
  change_cursor_shape(scr_stat *scp, int flags, int base, int height)
  {
      if ((scp == scp->sc->cur_scp) && !ISGRAPHSC(scp))
  	sc_remove_cursor_image(scp);
  
      if (base >= 0)
  	scp->curr_curs_attr.base = base;
      if (height >= 0)
  	scp->curr_curs_attr.height = height;
      if (flags & CONS_RESET_CURSOR)
  	scp->curr_curs_attr = scp->dflt_curs_attr;
      else
  	scp->curr_curs_attr.flags = flags & CONS_CURSOR_ATTRS;
  
      if ((scp == scp->sc->cur_scp) && !ISGRAPHSC(scp)) {
  	sc_set_cursor_image(scp);
  	sc_draw_cursor_image(scp);
      }
  }
  
  void
  sc_change_cursor_shape(scr_stat *scp, int flags, int base, int height)
  {
      sc_softc_t *sc;
      struct tty *tp;
      int s;
      int i;
  
      s = spltty();
      if ((flags != -1) && (flags & CONS_LOCAL_CURSOR)) {
  	/* local (per vty) change */
  	change_cursor_shape(scp, flags, base, height);
  	splx(s);
  	return;
      }
  
      /* global change */
      sc = scp->sc;
      if (base >= 0)
  	sc->curs_attr.base = base;
      if (height >= 0)
  	sc->curs_attr.height = height;
      if (flags != -1) {
  	if (flags & CONS_RESET_CURSOR)
  	    sc->curs_attr = sc->dflt_curs_attr;
  	else
  	    sc->curs_attr.flags = flags & CONS_CURSOR_ATTRS;
      }
  
      for (i = sc->first_vty; i < sc->first_vty + sc->vtys; ++i) {
  	if ((tp = SC_DEV(sc, i)) == NULL)
  	    continue;
  	if ((scp = sc_get_stat(tp)) == NULL)
  	    continue;
  	scp->dflt_curs_attr = sc->curs_attr;
  	change_cursor_shape(scp, CONS_RESET_CURSOR, -1, -1);
      }
      splx(s);
  }
  
  static void
  scinit(int unit, int flags)
  {
  
      /*
       * When syscons is being initialized as the kernel console, malloc()
       * is not yet functional, because various kernel structures has not been
       * fully initialized yet.  Therefore, we need to declare the following
       * static buffers for the console.  This is less than ideal, 
       * but is necessry evil for the time being.  XXX
       */
  #ifdef PC98
      static u_short sc_buffer[ROW*COL*2];/* XXX */
  #else
      static u_short sc_buffer[ROW*COL];	/* XXX */
  #endif
  #ifndef SC_NO_FONT_LOADING
      static u_char font_8[256*8];
      static u_char font_14[256*14];
      static u_char font_16[256*16];
  #endif
  
      sc_softc_t *sc;
      scr_stat *scp;
      video_adapter_t *adp;
      int col;
      int row;
      int i;
  
      /* one time initialization */
      if (init_done == COLD)
  	sc_get_bios_values(&bios_value);
      init_done = WARM;
  
      /*
       * Allocate resources.  Even if we are being called for the second
       * time, we must allocate them again, because they might have 
       * disappeared...
       */
      sc = sc_get_softc(unit, flags & SC_KERNEL_CONSOLE);
      if ((sc->flags & SC_INIT_DONE) == 0)
  	SC_VIDEO_LOCKINIT(sc);
  
      adp = NULL;
      if (sc->adapter >= 0) {
  	vid_release(sc->adp, (void *)&sc->adapter);
  	adp = sc->adp;
  	sc->adp = NULL;
      }
      if (sc->keyboard >= 0) {
  	DPRINTF(5, ("sc%d: releasing kbd%d\n", unit, sc->keyboard));
  	i = kbd_release(sc->kbd, (void *)&sc->keyboard);
  	DPRINTF(5, ("sc%d: kbd_release returned %d\n", unit, i));
  	if (sc->kbd != NULL) {
  	    DPRINTF(5, ("sc%d: kbd != NULL!, index:%d, unit:%d, flags:0x%x\n",
  		unit, sc->kbd->kb_index, sc->kbd->kb_unit, sc->kbd->kb_flags));
  	}
  	sc->kbd = NULL;
      }
      sc->adapter = vid_allocate("*", unit, (void *)&sc->adapter);
      sc->adp = vid_get_adapter(sc->adapter);
      /* assert((sc->adapter >= 0) && (sc->adp != NULL)) */
  
      sc->keyboard = sc_allocate_keyboard(sc, unit);
      DPRINTF(1, ("sc%d: keyboard %d\n", unit, sc->keyboard));
  
      sc->kbd = kbd_get_keyboard(sc->keyboard);
      if (sc->kbd != NULL) {
  	DPRINTF(1, ("sc%d: kbd index:%d, unit:%d, flags:0x%x\n",
  		unit, sc->kbd->kb_index, sc->kbd->kb_unit, sc->kbd->kb_flags));
      }
  
      if (!(sc->flags & SC_INIT_DONE) || (adp != sc->adp)) {
  
  	sc->initial_mode = sc->adp->va_initial_mode;
  
  #ifndef SC_NO_FONT_LOADING
  	if (flags & SC_KERNEL_CONSOLE) {
  	    sc->font_8 = font_8;
  	    sc->font_14 = font_14;
  	    sc->font_16 = font_16;
  	} else if (sc->font_8 == NULL) {
  	    /* assert(sc_malloc) */
  	    sc->font_8 = malloc(sizeof(font_8), M_DEVBUF, M_WAITOK);
  	    sc->font_14 = malloc(sizeof(font_14), M_DEVBUF, M_WAITOK);
  	    sc->font_16 = malloc(sizeof(font_16), M_DEVBUF, M_WAITOK);
  	}
  #endif
  
  	/* extract the hardware cursor location and hide the cursor for now */
  	vidd_read_hw_cursor(sc->adp, &col, &row);
  	vidd_set_hw_cursor(sc->adp, -1, -1);
  
  	/* set up the first console */
  	sc->first_vty = unit*MAXCONS;
  	sc->vtys = MAXCONS;		/* XXX: should be configurable */
  	if (flags & SC_KERNEL_CONSOLE) {
  	    /*
  	     * Set up devs structure but don't use it yet, calling make_dev()
  	     * might panic kernel.  Wait for sc_attach_unit() to actually
  	     * create the devices.
  	     */
  	    sc->dev = main_devs;
  	    scp = &main_console;
  	    init_scp(sc, sc->first_vty, scp);
  	    sc_vtb_init(&scp->vtb, VTB_MEMORY, scp->xsize, scp->ysize,
  			(void *)sc_buffer, FALSE);
  
  	    /* move cursors to the initial positions */
  	    if (col >= scp->xsize)
  		col = 0;
  	    if (row >= scp->ysize)
  		row = scp->ysize - 1;
  	    scp->xpos = col;
  	    scp->ypos = row;
  	    scp->cursor_pos = scp->cursor_oldpos = row*scp->xsize + col;
  
  	    if (sc_init_emulator(scp, SC_DFLT_TERM))
  		sc_init_emulator(scp, "*");
  	    (*scp->tsw->te_default_attr)(scp,
  					 user_default.std_color,
  					 user_default.rev_color);
  	} else {
  	    /* assert(sc_malloc) */
  	    sc->dev = malloc(sizeof(struct tty *)*sc->vtys, M_DEVBUF,
  	        M_WAITOK|M_ZERO);
  	    sc->dev[0] = sc_alloc_tty(0, unit * MAXCONS);
  	    scp = alloc_scp(sc, sc->first_vty);
  	    SC_STAT(sc->dev[0]) = scp;
  	}
  	sc->cur_scp = scp;
  
  #ifndef __sparc64__
  	/* copy screen to temporary buffer */
  	sc_vtb_init(&scp->scr, VTB_FRAMEBUFFER, scp->xsize, scp->ysize,
  		    (void *)scp->sc->adp->va_window, FALSE);
  	if (ISTEXTSC(scp))
  	    sc_vtb_copy(&scp->scr, 0, &scp->vtb, 0, scp->xsize*scp->ysize);
  #endif
  
  	if (bios_value.cursor_end < scp->font_size)
  	    sc->dflt_curs_attr.base = scp->font_size - 
  					  bios_value.cursor_end - 1;
  	else
  	    sc->dflt_curs_attr.base = 0;
  	i = bios_value.cursor_end - bios_value.cursor_start + 1;
  	sc->dflt_curs_attr.height = imin(i, scp->font_size);
  	sc->dflt_curs_attr.flags = 0;
  	sc->curs_attr = sc->dflt_curs_attr;
  	scp->curr_curs_attr = scp->dflt_curs_attr = sc->curs_attr;
  
  #ifndef SC_NO_SYSMOUSE
  	sc_mouse_move(scp, scp->xpixel/2, scp->ypixel/2);
  #endif
  	if (!ISGRAPHSC(scp)) {
      	    sc_set_cursor_image(scp);
      	    sc_draw_cursor_image(scp);
  	}
  
  	/* save font and palette */
  #ifndef SC_NO_FONT_LOADING
  	sc->fonts_loaded = 0;
  	if (ISFONTAVAIL(sc->adp->va_flags)) {
  #ifdef SC_DFLT_FONT
  	    bcopy(dflt_font_8, sc->font_8, sizeof(dflt_font_8));
  	    bcopy(dflt_font_14, sc->font_14, sizeof(dflt_font_14));
  	    bcopy(dflt_font_16, sc->font_16, sizeof(dflt_font_16));
  	    sc->fonts_loaded = FONT_16 | FONT_14 | FONT_8;
  	    if (scp->font_size < 14) {
  		sc_load_font(scp, 0, 8, 8, sc->font_8, 0, 256);
  	    } else if (scp->font_size >= 16) {
  		sc_load_font(scp, 0, 16, 8, sc->font_16, 0, 256);
  	    } else {
  		sc_load_font(scp, 0, 14, 8, sc->font_14, 0, 256);
  	    }
  #else /* !SC_DFLT_FONT */
  	    if (scp->font_size < 14) {
  		sc_save_font(scp, 0, 8, 8, sc->font_8, 0, 256);
  		sc->fonts_loaded = FONT_8;
  	    } else if (scp->font_size >= 16) {
  		sc_save_font(scp, 0, 16, 8, sc->font_16, 0, 256);
  		sc->fonts_loaded = FONT_16;
  	    } else {
  		sc_save_font(scp, 0, 14, 8, sc->font_14, 0, 256);
  		sc->fonts_loaded = FONT_14;
  	    }
  #endif /* SC_DFLT_FONT */
  	    /* FONT KLUDGE: always use the font page #0. XXX */
  	    sc_show_font(scp, 0);
  	}
  #endif /* !SC_NO_FONT_LOADING */
  
  #ifndef SC_NO_PALETTE_LOADING
  	vidd_save_palette(sc->adp, sc->palette);
  #ifdef SC_PIXEL_MODE
  	for (i = 0; i < sizeof(sc->palette2); i++)
  		sc->palette2[i] = i / 3;
  #endif
  #endif
  
  #ifdef DEV_SPLASH
  	if (!(sc->flags & SC_SPLASH_SCRN)) {
  	    /* we are ready to put up the splash image! */
  	    splash_init(sc->adp, scsplash_callback, sc);
  	    sc->flags |= SC_SPLASH_SCRN;
  	}
  #endif
      }
  
      /* the rest is not necessary, if we have done it once */
      if (sc->flags & SC_INIT_DONE)
  	return;
  
      /* initialize mapscrn arrays to a one to one map */
      for (i = 0; i < sizeof(sc->scr_map); i++)
  	sc->scr_map[i] = sc->scr_rmap[i] = i;
  #ifdef PC98
      sc->scr_map[0x5c] = (u_char)0xfc;	/* for backslash */
  #endif
  
      sc->flags |= SC_INIT_DONE;
  }
  
  static void
  scterm(int unit, int flags)
  {
      sc_softc_t *sc;
      scr_stat *scp;
  
      sc = sc_get_softc(unit, flags & SC_KERNEL_CONSOLE);
      if (sc == NULL)
  	return;			/* shouldn't happen */
  
  #ifdef DEV_SPLASH
      /* this console is no longer available for the splash screen */
      if (sc->flags & SC_SPLASH_SCRN) {
  	splash_term(sc->adp);
  	sc->flags &= ~SC_SPLASH_SCRN;
      }
  #endif
  
  #if 0 /* XXX */
      /* move the hardware cursor to the upper-left corner */
      vidd_set_hw_cursor(sc->adp, 0, 0);
  #endif
  
      /* release the keyboard and the video card */
      if (sc->keyboard >= 0)
  	kbd_release(sc->kbd, &sc->keyboard);
      if (sc->adapter >= 0)
  	vid_release(sc->adp, &sc->adapter);
  
      /* stop the terminal emulator, if any */
      scp = sc_get_stat(sc->dev[0]);
      if (scp->tsw)
  	(*scp->tsw->te_term)(scp, &scp->ts);
      if (scp->ts != NULL)
  	free(scp->ts, M_DEVBUF);
      mtx_destroy(&scp->scr_lock);
  
      /* clear the structure */
      if (!(flags & SC_KERNEL_CONSOLE)) {
  	/* XXX: We need delete_dev() for this */
  	free(sc->dev, M_DEVBUF);
  #if 0
  	/* XXX: We need a ttyunregister for this */
  	free(sc->tty, M_DEVBUF);
  #endif
  #ifndef SC_NO_FONT_LOADING
  	free(sc->font_8, M_DEVBUF);
  	free(sc->font_14, M_DEVBUF);
  	free(sc->font_16, M_DEVBUF);
  #endif
  	/* XXX vtb, history */
      }
      bzero(sc, sizeof(*sc));
      sc->keyboard = -1;
      sc->adapter = -1;
  }
  
  static void
  scshutdown(__unused void *arg, __unused int howto)
  {
  
  	KASSERT(sc_console != NULL, ("sc_console != NULL"));
  	KASSERT(sc_console->sc != NULL, ("sc_console->sc != NULL"));
  	KASSERT(sc_console->sc->cur_scp != NULL,
  	    ("sc_console->sc->cur_scp != NULL"));
  
  	sc_touch_scrn_saver();
  	if (!cold &&
  	    sc_console->sc->cur_scp->index != sc_console->index &&
  	    sc_console->sc->cur_scp->smode.mode == VT_AUTO &&
  	    sc_console->smode.mode == VT_AUTO)
  		sc_switch_scr(sc_console->sc, sc_console->index);
  	shutdown_in_progress = TRUE;
  }
  
  static void
  scsuspend(__unused void *arg)
  {
  	int retry;
  
  	KASSERT(sc_console != NULL, ("sc_console != NULL"));
  	KASSERT(sc_console->sc != NULL, ("sc_console->sc != NULL"));
  	KASSERT(sc_console->sc->cur_scp != NULL,
  	    ("sc_console->sc->cur_scp != NULL"));
  
  	sc_susp_scr = sc_console->sc->cur_scp->index;
  	if (sc_no_suspend_vtswitch ||
  	    sc_susp_scr == sc_console->index) {
  		sc_touch_scrn_saver();
  		sc_susp_scr = -1;
  		return;
  	}
  	for (retry = 0; retry < 10; retry++) {
  		sc_switch_scr(sc_console->sc, sc_console->index);
  		if (!sc_console->sc->switch_in_progress)
  			break;
  		pause("scsuspend", hz);
  	}
  	suspend_in_progress = TRUE;
  }
  
  static void
  scresume(__unused void *arg)
  {
  
  	KASSERT(sc_console != NULL, ("sc_console != NULL"));
  	KASSERT(sc_console->sc != NULL, ("sc_console->sc != NULL"));
  	KASSERT(sc_console->sc->cur_scp != NULL,
  	    ("sc_console->sc->cur_scp != NULL"));
  
  	suspend_in_progress = FALSE;
  	if (sc_susp_scr < 0) {
  		update_font(sc_console->sc->cur_scp);
  		return;
  	}
  	sc_switch_scr(sc_console->sc, sc_susp_scr);
  }
  
  int
  sc_clean_up(scr_stat *scp)
  {
  #ifdef DEV_SPLASH
      int error;
  #endif
  
      if (scp->sc->flags & SC_SCRN_BLANKED) {
  	sc_touch_scrn_saver();
  #ifdef DEV_SPLASH
  	if ((error = wait_scrn_saver_stop(scp->sc)))
  	    return error;
  #endif
      }
      scp->status |= MOUSE_HIDDEN;
      sc_remove_mouse_image(scp);
      sc_remove_cutmarking(scp);
      return 0;
  }
  
  void
  sc_alloc_scr_buffer(scr_stat *scp, int wait, int discard)
  {
      sc_vtb_t new;
      sc_vtb_t old;
  
      old = scp->vtb;
      sc_vtb_init(&new, VTB_MEMORY, scp->xsize, scp->ysize, NULL, wait);
      if (!discard && (old.vtb_flags & VTB_VALID)) {
  	/* retain the current cursor position and buffer contants */
  	scp->cursor_oldpos = scp->cursor_pos;
  	/* 
  	 * This works only if the old buffer has the same size as or larger 
  	 * than the new one. XXX
  	 */
  	sc_vtb_copy(&old, 0, &new, 0, scp->xsize*scp->ysize);
  	scp->vtb = new;
      } else {
  	scp->vtb = new;
  	sc_vtb_destroy(&old);
      }
  
  #ifndef SC_NO_SYSMOUSE
      /* move the mouse cursor at the center of the screen */
      sc_mouse_move(scp, scp->xpixel / 2, scp->ypixel / 2);
  #endif
  }
  
  static scr_stat
  *alloc_scp(sc_softc_t *sc, int vty)
  {
      scr_stat *scp;
  
      /* assert(sc_malloc) */
  
      scp = (scr_stat *)malloc(sizeof(scr_stat), M_DEVBUF, M_WAITOK);
      init_scp(sc, vty, scp);
  
      sc_alloc_scr_buffer(scp, TRUE, TRUE);
      if (sc_init_emulator(scp, SC_DFLT_TERM))
  	sc_init_emulator(scp, "*");
  
  #ifndef SC_NO_CUTPASTE
      sc_alloc_cut_buffer(scp, TRUE);
  #endif
  
  #ifndef SC_NO_HISTORY
      sc_alloc_history_buffer(scp, 0, 0, TRUE);
  #endif
  
      return scp;
  }
  
  static void
  init_scp(sc_softc_t *sc, int vty, scr_stat *scp)
  {
      video_info_t info;
  
      bzero(scp, sizeof(*scp));
  
      scp->index = vty;
      scp->sc = sc;
      scp->status = 0;
      scp->mode = sc->initial_mode;
      vidd_get_info(sc->adp, scp->mode, &info);
      if (info.vi_flags & V_INFO_GRAPHICS) {
  	scp->status |= GRAPHICS_MODE;
  	scp->xpixel = info.vi_width;
  	scp->ypixel = info.vi_height;
  	scp->xsize = info.vi_width/info.vi_cwidth;
  	scp->ysize = info.vi_height/info.vi_cheight;
  	scp->font_size = 0;
  	scp->font = NULL;
      } else {
  	scp->xsize = info.vi_width;
  	scp->ysize = info.vi_height;
  	scp->xpixel = scp->xsize*info.vi_cwidth;
  	scp->ypixel = scp->ysize*info.vi_cheight;
      }
  
      scp->font_size = info.vi_cheight;
      scp->font_width = info.vi_cwidth;
  #ifndef SC_NO_FONT_LOADING
      if (info.vi_cheight < 14)
  	scp->font = sc->font_8;
      else if (info.vi_cheight >= 16)
  	scp->font = sc->font_16;
      else
  	scp->font = sc->font_14;
  #else
      scp->font = NULL;
  #endif
  
      sc_vtb_init(&scp->vtb, VTB_MEMORY, 0, 0, NULL, FALSE);
  #ifndef __sparc64__
      sc_vtb_init(&scp->scr, VTB_FRAMEBUFFER, 0, 0, NULL, FALSE);
  #endif
      scp->xoff = scp->yoff = 0;
      scp->xpos = scp->ypos = 0;
      scp->start = scp->xsize * scp->ysize - 1;
      scp->end = 0;
      scp->tsw = NULL;
      scp->ts = NULL;
      scp->rndr = NULL;
      scp->border = (SC_NORM_ATTR >> 4) & 0x0f;
      scp->curr_curs_attr = scp->dflt_curs_attr = sc->curs_attr;
      scp->mouse_cut_start = scp->xsize*scp->ysize;
      scp->mouse_cut_end = -1;
      scp->mouse_signal = 0;
      scp->mouse_pid = 0;
      scp->mouse_proc = NULL;
      scp->kbd_mode = K_XLATE;
      scp->bell_pitch = bios_value.bell_pitch;
      scp->bell_duration = BELL_DURATION;
      scp->status |= (bios_value.shift_state & NLKED);
      scp->status |= CURSOR_ENABLED | MOUSE_HIDDEN;
      scp->pid = 0;
      scp->proc = NULL;
      scp->smode.mode = VT_AUTO;
      scp->history = NULL;
      scp->history_pos = 0;
      scp->history_size = 0;
  
      mtx_init(&scp->scr_lock, "scrlock", NULL, MTX_SPIN);
  }
  
  int
  sc_init_emulator(scr_stat *scp, char *name)
  {
      sc_term_sw_t *sw;
      sc_rndr_sw_t *rndr;
      void *p;
      int error;
  
      if (name == NULL)	/* if no name is given, use the current emulator */
  	sw = scp->tsw;
      else		/* ...otherwise find the named emulator */
  	sw = sc_term_match(name);
      if (sw == NULL)
  	return EINVAL;
  
      rndr = NULL;
      if (strcmp(sw->te_renderer, "*") != 0) {
  	rndr = sc_render_match(scp, sw->te_renderer,
  			       scp->status & (GRAPHICS_MODE | PIXEL_MODE));
      }
      if (rndr == NULL) {
  	rndr = sc_render_match(scp, scp->sc->adp->va_name,
  			       scp->status & (GRAPHICS_MODE | PIXEL_MODE));
  	if (rndr == NULL)
  	    return ENODEV;
      }
  
      if (sw == scp->tsw) {
  	error = (*sw->te_init)(scp, &scp->ts, SC_TE_WARM_INIT);
  	scp->rndr = rndr;
  	scp->rndr->init(scp);
  	sc_clear_screen(scp);
  	/* assert(error == 0); */
  	return error;
      }
  
      if (sc_malloc && (sw->te_size > 0))
  	p = malloc(sw->te_size, M_DEVBUF, M_NOWAIT);
      else
  	p = NULL;
      error = (*sw->te_init)(scp, &p, SC_TE_COLD_INIT);
      if (error)
  	return error;
  
      if (scp->tsw)
  	(*scp->tsw->te_term)(scp, &scp->ts);
      if (scp->ts != NULL)
  	free(scp->ts, M_DEVBUF);
      scp->tsw = sw;
      scp->ts = p;
      scp->rndr = rndr;
      scp->rndr->init(scp);
  
      /* XXX */
      (*sw->te_default_attr)(scp, user_default.std_color, user_default.rev_color);
      sc_clear_screen(scp);
  
      return 0;
  }
  
  /*
   * scgetc(flags) - get character from keyboard.
   * If flags & SCGETC_CN, then avoid harmful side effects.
   * If flags & SCGETC_NONBLOCK, then wait until a key is pressed, else
   * return NOKEY if there is nothing there.
   */
  static u_int
  scgetc(sc_softc_t *sc, u_int flags)
  {
      scr_stat *scp;
  #ifndef SC_NO_HISTORY
      struct tty *tp;
  #endif
      u_int c;
      int this_scr;
      int f;
      int i;
  
      if (sc->kbd == NULL)
  	return NOKEY;
  
  next_code:
  #if 1
      /* I don't like this, but... XXX */
      if (flags & SCGETC_CN)
  	sccnupdate(sc->cur_scp);
  #endif
      scp = sc->cur_scp;
      /* first see if there is something in the keyboard port */
      for (;;) {
  	c = kbdd_read_char(sc->kbd, !(flags & SCGETC_NONBLOCK));
  	if (c == ERRKEY) {
  	    if (!(flags & SCGETC_CN))
  		sc_bell(scp, bios_value.bell_pitch, BELL_DURATION);
  	} else if (c == NOKEY)
  	    return c;
  	else
  	    break;
      }
  
      /* make screensaver happy */
      if (!(c & RELKEY))
  	sc_touch_scrn_saver();
  
      if (!(flags & SCGETC_CN))
  	random_harvest_queue(&c, sizeof(c), 1, RANDOM_KEYBOARD);
  
      if (scp->kbd_mode != K_XLATE)
  	return KEYCHAR(c);
  
      /* if scroll-lock pressed allow history browsing */
      if (!ISGRAPHSC(scp) && scp->history && scp->status & SLKED) {
  
  	scp->status &= ~CURSOR_ENABLED;
  	sc_remove_cursor_image(scp);
  
  #ifndef SC_NO_HISTORY
  	if (!(scp->status & BUFFER_SAVED)) {
  	    scp->status |= BUFFER_SAVED;
  	    sc_hist_save(scp);
  	}
  	switch (c) {
  	/* FIXME: key codes */
  	case SPCLKEY | FKEY | F(49):  /* home key */
  	    sc_remove_cutmarking(scp);
  	    sc_hist_home(scp);
  	    goto next_code;
  
  	case SPCLKEY | FKEY | F(57):  /* end key */
  	    sc_remove_cutmarking(scp);
  	    sc_hist_end(scp);
  	    goto next_code;
  
  	case SPCLKEY | FKEY | F(50):  /* up arrow key */
  	    sc_remove_cutmarking(scp);
  	    if (sc_hist_up_line(scp))
  		if (!(flags & SCGETC_CN))
  		    sc_bell(scp, bios_value.bell_pitch, BELL_DURATION);
  	    goto next_code;
  
  	case SPCLKEY | FKEY | F(58):  /* down arrow key */
  	    sc_remove_cutmarking(scp);
  	    if (sc_hist_down_line(scp))
  		if (!(flags & SCGETC_CN))
  		    sc_bell(scp, bios_value.bell_pitch, BELL_DURATION);
  	    goto next_code;
  
  	case SPCLKEY | FKEY | F(51):  /* page up key */
  	    sc_remove_cutmarking(scp);
  	    for (i=0; i<scp->ysize; i++)
  	    if (sc_hist_up_line(scp)) {
  		if (!(flags & SCGETC_CN))
  		    sc_bell(scp, bios_value.bell_pitch, BELL_DURATION);
  		break;
  	    }
  	    goto next_code;
  
  	case SPCLKEY | FKEY | F(59):  /* page down key */
  	    sc_remove_cutmarking(scp);
  	    for (i=0; i<scp->ysize; i++)
  	    if (sc_hist_down_line(scp)) {
  		if (!(flags & SCGETC_CN))
  		    sc_bell(scp, bios_value.bell_pitch, BELL_DURATION);
  		break;
  	    }
  	    goto next_code;
  	}
  #endif /* SC_NO_HISTORY */
      }
  
      /* 
       * Process and consume special keys here.  Return a plain char code
       * or a char code with the META flag or a function key code.
       */
      if (c & RELKEY) {
  	/* key released */
  	/* goto next_code */
      } else {
  	/* key pressed */
  	if (c & SPCLKEY) {
  	    c &= ~SPCLKEY;
  	    switch (KEYCHAR(c)) {
  	    /* LOCKING KEYS */
  	    case NLK: case CLK: case ALK:
  		break;
  	    case SLK:
  		(void)kbdd_ioctl(sc->kbd, KDGKBSTATE, (caddr_t)&f);
  		if (f & SLKED) {
  		    scp->status |= SLKED;
  		} else {
  		    if (scp->status & SLKED) {
  			scp->status &= ~SLKED;
  #ifndef SC_NO_HISTORY
  			if (scp->status & BUFFER_SAVED) {
  			    if (!sc_hist_restore(scp))
  				sc_remove_cutmarking(scp);
  			    scp->status &= ~BUFFER_SAVED;
  			    scp->status |= CURSOR_ENABLED;
  			    sc_draw_cursor_image(scp);
  			}
  			tp = SC_DEV(sc, scp->index);
  			if (!kdb_active && tty_opened_ns(tp))
  			    sctty_outwakeup(tp);
  #endif
  		    }
  		}
  		break;
  
  	    case PASTE:
  #ifndef SC_NO_CUTPASTE
  		sc_mouse_paste(scp);
  #endif
  		break;
  
  	    /* NON-LOCKING KEYS */
  	    case NOP:
  	    case LSH:  case RSH:  case LCTR: case RCTR:
  	    case LALT: case RALT: case ASH:  case META:
  		break;
  
  	    case BTAB:
  		if (!(sc->flags & SC_SCRN_BLANKED))
  		    return c;
  		break;
  
  	    case SPSC:
  #ifdef DEV_SPLASH
  		/* force activatation/deactivation of the screen saver */
  		if (!(sc->flags & SC_SCRN_BLANKED)) {
  		    run_scrn_saver = TRUE;
  		    sc->scrn_time_stamp -= scrn_blank_time;
  		}
  		if (cold) {
  		    /*
  		     * While devices are being probed, the screen saver need
  		     * to be invoked explicitly. XXX
  		     */
  		    if (sc->flags & SC_SCRN_BLANKED) {
  			scsplash_stick(FALSE);
  			stop_scrn_saver(sc, current_saver);
  		    } else {
  			if (!ISGRAPHSC(scp)) {
  			    scsplash_stick(TRUE);
  			    (*current_saver)(sc, TRUE);
  			}
  		    }
  		}
  #endif /* DEV_SPLASH */
  		break;
  
  	    case RBT:
  #ifndef SC_DISABLE_REBOOT
  		if (enable_reboot)
  			shutdown_nice(0);
  #endif
  		break;
  
  	    case HALT:
  #ifndef SC_DISABLE_REBOOT
  		if (enable_reboot)
  			shutdown_nice(RB_HALT);
  #endif
  		break;
  
  	    case PDWN:
  #ifndef SC_DISABLE_REBOOT
  		if (enable_reboot)
  			shutdown_nice(RB_HALT|RB_POWEROFF);
  #endif
  		break;
  
  	    case SUSP:
  		power_pm_suspend(POWER_SLEEP_STATE_SUSPEND);
  		break;
  	    case STBY:
  		power_pm_suspend(POWER_SLEEP_STATE_STANDBY);
  		break;
  
  	    case DBG:
  #ifndef SC_DISABLE_KDBKEY
  		if (enable_kdbkey)
  			kdb_break();
  #endif
  		break;
  
  	    case PNC:
  		if (enable_panic_key)
  			panic("Forced by the panic key");
  		break;
  
  	    case NEXT:
  		this_scr = scp->index;
  		for (i = (this_scr - sc->first_vty + 1)%sc->vtys;
  			sc->first_vty + i != this_scr; 
  			i = (i + 1)%sc->vtys) {
  		    struct tty *tp = SC_DEV(sc, sc->first_vty + i);
  		    if (tty_opened_ns(tp)) {
  			sc_switch_scr(scp->sc, sc->first_vty + i);
  			break;
  		    }
  		}
  		break;
  
  	    case PREV:
  		this_scr = scp->index;
  		for (i = (this_scr - sc->first_vty + sc->vtys - 1)%sc->vtys;
  			sc->first_vty + i != this_scr;
  			i = (i + sc->vtys - 1)%sc->vtys) {
  		    struct tty *tp = SC_DEV(sc, sc->first_vty + i);
  		    if (tty_opened_ns(tp)) {
  			sc_switch_scr(scp->sc, sc->first_vty + i);
  			break;
  		    }
  		}
  		break;
  
  	    default:
  		if (KEYCHAR(c) >= F_SCR && KEYCHAR(c) <= L_SCR) {
  		    sc_switch_scr(scp->sc, sc->first_vty + KEYCHAR(c) - F_SCR);
  		    break;
  		}
  		/* assert(c & FKEY) */
  		if (!(sc->flags & SC_SCRN_BLANKED))
  		    return c;
  		break;
  	    }
  	    /* goto next_code */
  	} else {
  	    /* regular keys (maybe MKEY is set) */
  #if !defined(SC_DISABLE_KDBKEY) && defined(KDB)
  	    if (enable_kdbkey)
  		kdb_alt_break(c, &sc->sc_altbrk);
  #endif
  	    if (!(sc->flags & SC_SCRN_BLANKED))
  		return c;
  	}
      }
  
      goto next_code;
  }
  
  static int
  sctty_mmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr,
      int nprot, vm_memattr_t *memattr)
  {
      scr_stat *scp;
  
      scp = sc_get_stat(tp);
      if (scp != scp->sc->cur_scp)
  	return -1;
      return vidd_mmap(scp->sc->adp, offset, paddr, nprot, memattr);
  }
  
  static void
  update_font(scr_stat *scp)
  {
  #ifndef SC_NO_FONT_LOADING
      /* load appropriate font */
      if (!(scp->status & GRAPHICS_MODE)) {
  	if (!(scp->status & PIXEL_MODE) && ISFONTAVAIL(scp->sc->adp->va_flags)) {
  	    if (scp->font_size < 14) {
  		if (scp->sc->fonts_loaded & FONT_8)
  		    sc_load_font(scp, 0, 8, 8, scp->sc->font_8, 0, 256);
  	    } else if (scp->font_size >= 16) {
  		if (scp->sc->fonts_loaded & FONT_16)
  		    sc_load_font(scp, 0, 16, 8, scp->sc->font_16, 0, 256);
  	    } else {
  		if (scp->sc->fonts_loaded & FONT_14)
  		    sc_load_font(scp, 0, 14, 8, scp->sc->font_14, 0, 256);
  	    }
  	    /*
  	     * FONT KLUDGE:
  	     * This is an interim kludge to display correct font.
  	     * Always use the font page #0 on the video plane 2.
  	     * Somehow we cannot show the font in other font pages on
  	     * some video cards... XXX
  	     */ 
  	    sc_show_font(scp, 0);
  	}
  	mark_all(scp);
      }
  #endif /* !SC_NO_FONT_LOADING */
  }
  
  static int
  save_kbd_state(scr_stat *scp)
  {
      int state;
      int error;
  
      error = kbdd_ioctl(scp->sc->kbd, KDGKBSTATE, (caddr_t)&state);
      if (error == ENOIOCTL)
  	error = ENODEV;
      if (error == 0) {
  	scp->status &= ~LOCK_MASK;
  	scp->status |= state;
      }
      return error;
  }
  
  static int
  update_kbd_state(scr_stat *scp, int new_bits, int mask)
  {
      int state;
      int error;
  
      if (mask != LOCK_MASK) {
  	error = kbdd_ioctl(scp->sc->kbd, KDGKBSTATE, (caddr_t)&state);
  	if (error == ENOIOCTL)
  	    error = ENODEV;
  	if (error)
  	    return error;
  	state &= ~mask;
  	state |= new_bits & mask;
      } else {
  	state = new_bits & LOCK_MASK;
      }
      error = kbdd_ioctl(scp->sc->kbd, KDSKBSTATE, (caddr_t)&state);
      if (error == ENOIOCTL)
  	error = ENODEV;
      return error;
  }
  
  static int
  update_kbd_leds(scr_stat *scp, int which)
  {
      int error;
  
      which &= LOCK_MASK;
      error = kbdd_ioctl(scp->sc->kbd, KDSETLED, (caddr_t)&which);
      if (error == ENOIOCTL)
  	error = ENODEV;
      return error;
  }
  
  int
  set_mode(scr_stat *scp)
  {
      video_info_t info;
  
      /* reject unsupported mode */
      if (vidd_get_info(scp->sc->adp, scp->mode, &info))
  	return 1;
  
      /* if this vty is not currently showing, do nothing */
      if (scp != scp->sc->cur_scp)
  	return 0;
  
      /* setup video hardware for the given mode */
      vidd_set_mode(scp->sc->adp, scp->mode);
      scp->rndr->init(scp);
  #ifndef __sparc64__
      sc_vtb_init(&scp->scr, VTB_FRAMEBUFFER, scp->xsize, scp->ysize,
  		(void *)scp->sc->adp->va_window, FALSE);
  #endif
  
      update_font(scp);
  
      sc_set_border(scp, scp->border);
      sc_set_cursor_image(scp);
  
      return 0;
  }
  
  void
  sc_set_border(scr_stat *scp, int color)
  {
      SC_VIDEO_LOCK(scp->sc);
      (*scp->rndr->draw_border)(scp, color);
      SC_VIDEO_UNLOCK(scp->sc);
  }
  
  #ifndef SC_NO_FONT_LOADING
  void
  sc_load_font(scr_stat *scp, int page, int size, int width, u_char *buf,
  	     int base, int count)
  {
      sc_softc_t *sc;
  
      sc = scp->sc;
      sc->font_loading_in_progress = TRUE;
      vidd_load_font(sc->adp, page, size, width, buf, base, count);
      sc->font_loading_in_progress = FALSE;
  }
  
  void
  sc_save_font(scr_stat *scp, int page, int size, int width, u_char *buf,
  	     int base, int count)
  {
      sc_softc_t *sc;
  
      sc = scp->sc;
      sc->font_loading_in_progress = TRUE;
      vidd_save_font(sc->adp, page, size, width, buf, base, count);
      sc->font_loading_in_progress = FALSE;
  }
  
  void
  sc_show_font(scr_stat *scp, int page)
  {
      vidd_show_font(scp->sc->adp, page);
  }
  #endif /* !SC_NO_FONT_LOADING */
  
  void
  sc_paste(scr_stat *scp, const u_char *p, int count) 
  {
      struct tty *tp;
      u_char *rmap;
  
      tp = SC_DEV(scp->sc, scp->sc->cur_scp->index);
      if (!tty_opened_ns(tp))
  	return;
      rmap = scp->sc->scr_rmap;
      for (; count > 0; --count)
  	ttydisc_rint(tp, rmap[*p++], 0);
      ttydisc_rint_done(tp);
  }
  
  void
  sc_respond(scr_stat *scp, const u_char *p, int count, int wakeup) 
  {
      struct tty *tp;
  
      tp = SC_DEV(scp->sc, scp->sc->cur_scp->index);
      if (!tty_opened_ns(tp))
  	return;
      ttydisc_rint_simple(tp, p, count);
      if (wakeup) {
  	/* XXX: we can't always call ttydisc_rint_done() here! */
  	ttydisc_rint_done(tp);
      }
  }
  
  void
  sc_bell(scr_stat *scp, int pitch, int duration)
  {
      if (cold || shutdown_in_progress || !enable_bell)
  	return;
  
      if (scp != scp->sc->cur_scp && (scp->sc->flags & SC_QUIET_BELL))
  	return;
  
      if (scp->sc->flags & SC_VISUAL_BELL) {
  	if (scp->sc->blink_in_progress)
  	    return;
  	scp->sc->blink_in_progress = 3;
  	if (scp != scp->sc->cur_scp)
  	    scp->sc->blink_in_progress += 2;
  	blink_screen(scp->sc->cur_scp);
      } else if (duration != 0 && pitch != 0) {
  	if (scp != scp->sc->cur_scp)
  	    pitch *= 2;
  	sysbeep(1193182 / pitch, duration);
      }
  }
  
  static void
  blink_screen(void *arg)
  {
      scr_stat *scp = arg;
      struct tty *tp;
  
      if (ISGRAPHSC(scp) || (scp->sc->blink_in_progress <= 1)) {
  	scp->sc->blink_in_progress = 0;
      	mark_all(scp);
  	tp = SC_DEV(scp->sc, scp->index);
  	if (tty_opened_ns(tp))
  	    sctty_outwakeup(tp);
  	if (scp->sc->delayed_next_scr)
  	    sc_switch_scr(scp->sc, scp->sc->delayed_next_scr - 1);
      }
      else {
  	(*scp->rndr->draw)(scp, 0, scp->xsize*scp->ysize, 
  			   scp->sc->blink_in_progress & 1);
  	scp->sc->blink_in_progress--;
  	callout_reset_sbt(&scp->sc->cblink, SBT_1S / 15, 0,
  	    blink_screen, scp, C_PREL(0));
      }
  }
  
  /*
   * Until sc_attach_unit() gets called no dev structures will be available
   * to store the per-screen current status.  This is the case when the
   * kernel is initially booting and needs access to its console.  During
   * this early phase of booting the console's current status is kept in
   * one statically defined scr_stat structure, and any pointers to the
   * dev structures will be NULL.
   */
  
  static scr_stat *
  sc_get_stat(struct tty *tp)
  {
  	if (tp == NULL)
  		return (&main_console);
  	return (SC_STAT(tp));
  }
  
  /*
   * Allocate active keyboard. Try to allocate "kbdmux" keyboard first, and,
   * if found, add all non-busy keyboards to "kbdmux". Otherwise look for
   * any keyboard.
   */
  
  static int
  sc_allocate_keyboard(sc_softc_t *sc, int unit)
  {
  	int		 idx0, idx;
  	keyboard_t	*k0, *k;
  	keyboard_info_t	 ki;
  
  	idx0 = kbd_allocate("kbdmux", -1, (void *)&sc->keyboard, sckbdevent, sc);
  	if (idx0 != -1) {
  		k0 = kbd_get_keyboard(idx0);
  
  		for (idx = kbd_find_keyboard2("*", -1, 0);
  		     idx != -1;
  		     idx = kbd_find_keyboard2("*", -1, idx + 1)) {
  			k = kbd_get_keyboard(idx);
  
  			if (idx == idx0 || KBD_IS_BUSY(k))
  				continue;
  
  			bzero(&ki, sizeof(ki));
  			strcpy(ki.kb_name, k->kb_name);
  			ki.kb_unit = k->kb_unit;
  
  			(void)kbdd_ioctl(k0, KBADDKBD, (caddr_t) &ki);
  		}
  	} else
  		idx0 = kbd_allocate("*", unit, (void *)&sc->keyboard, sckbdevent, sc);
  
  	return (idx0);
  }
  