/*-
 * 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>
 *
 * Simple font scaling code by Sascha Wildner and Matthew Dillon
 *
 * 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.
 *
 * $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/sys/dev/syscons/syscons.c,v 1.336.2.17 2004/03/25 08:41:09 ru Exp $
 */

#include "use_splash.h"
#include "opt_syscons.h"
#include "opt_ddb.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/eventhandler.h>
#include <sys/reboot.h>
#include <sys/caps.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/signalvar.h>
#include <sys/sysctl.h>
#include <sys/taskqueue.h>
#include <sys/tty.h>
#include <sys/ttydefaults.h>    /* for TTYDEF_* */
#include <sys/kernel.h>
#include <sys/cons.h>
#include <sys/random.h>
#include <ddb/ddb.h>

#include <sys/thread2.h>
#include <sys/mutex2.h>

#include <machine/clock.h>
#include <machine/console.h>
#include <machine/psl.h>
#include <machine/pc/display.h>
#include <machine/frame.h>
#include <machine/framebuffer.h>

#include <vm/pmap.h>

#include <dev/misc/kbd/kbdreg.h>
#include <dev/video/fb/fbreg.h>
#include <dev/video/fb/splashreg.h>
#include "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 SCRN_ASYNCOK            0x0001
#define SCRN_BULKUNLOCK         0x0002

#define KEYCODE_BS              0x0e            /* "<-- Backspace" key, XXX */
#define WANT_UNLOCK(m) do {       \
        if (m)                    \
                syscons_unlock(); \
} while (0)

#define WANT_LOCK(m) do {         \
        if (m)                    \
                syscons_lock();   \
} while(0)


MALLOC_DEFINE(M_SYSCONS, "syscons", "Syscons");

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 default_attr kernel_default = {
    SC_KERNEL_CONS_ATTR,
    SC_KERNEL_CONS_REV_ATTR,
};

static  int             sc_console_unit = -1;
static  scr_stat        *sc_console;
static  struct tty      *sc_console_tty;
static  void            *kernel_console_ts;

static  char            init_done = COLD;
static  char            shutdown_in_progress = FALSE;
static  char            sc_malloc = FALSE;
static  char            sc_filled_border = FALSE; /* filled initial VT border */

static  int             saver_mode = CONS_NO_SAVER; /* LKM/user saver */
static  int             run_scrn_saver = FALSE; /* should run the saver? */
static  long            scrn_blank_time = 0;    /* screen saver timeout value */
#if NSPLASH > 0
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

/*
 * Lock for asynchronous screen update thread, needed to safely modify the
 * framebuffer information.
 */
static struct lock      sc_asynctd_lk;

#if !defined(SC_NO_FONT_LOADING) && defined(SC_DFLT_FONT)
#include "font.h"
#endif

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 the panic key (CTRL-ALT-SHIFT-ESC)");

static  int             syscons_async;
static  int             enable_bell = TRUE;

static SYSCTL_NODE(_kern, OID_AUTO, syscons, CTLFLAG_RD, 0, "syscons");
SYSCTL_INT(_kern, OID_AUTO, syscons_async, CTLFLAG_RW, &syscons_async,
           0, "Asynchronous bulk syscons fb updates");
SYSCTL_INT(_kern_syscons, OID_AUTO, enable_bell, CTLFLAG_RW, &enable_bell,
           0, "Enable bell");

static int desired_cols = 0;
TUNABLE_INT("kern.kms_columns", &desired_cols);

#define SC_CONSOLECTL   255

#define VIRTUAL_TTY(sc, x) ((SC_DEV((sc),(x)) != NULL) ?        \
        (SC_DEV((sc),(x))->si_tty) : NULL)
#define ISTTYOPEN(tp)   ((tp) && ((tp)->t_state & TS_ISOPEN))

static  int     debugger;
static  cdev_t  cctl_dev;
static  timeout_t blink_screen_callout;
static  void    sc_blink_screen(scr_stat *scp);
static  struct mtx      syscons_mtx = MTX_INITIALIZER("syscons");
static  struct lock     syscons_blink_lk = LOCK_INITIALIZER("sblnk", 0, 0);

/* prototypes */
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(cdev_t dev);
static kbd_callback_func_t sckbdevent;
static int scparam(struct tty *tp, struct termios *t);
static void scstart(struct tty *tp);
static void scinit(int unit, int flags);
#if 0
static void scterm(int unit, int flags);
#endif
static void scshutdown(void *arg, int howto);
static void sc_puts(scr_stat *scp, u_char *buf, int len);
static u_int scgetc(sc_softc_t *sc, u_int flags);
#define SCGETC_CN       1
#define SCGETC_NONBLOCK 2
static int sccngetch(int flags);
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, int flags);
static void scrn_update_thread(void *arg);

static void sc_fb_set_par(void *context, int pending);
#if NSPLASH > 0
static void sc_fb_blank(void *context, int pending);
#endif /* NSPLASH */

#if NSPLASH > 0
static void scframebuffer_saver(sc_softc_t *sc, int show);
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, int need_unlock);
#define scsplash_stick(stick)           (sticky_splash = (stick))
#else /* !NSPLASH */
#define scsplash_stick(stick)
#endif /* NSPLASH */

static void do_switch_scr(sc_softc_t *sc);
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);
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 int save_kbd_state(scr_stat *scp, int unlock);
static int update_kbd_state(scr_stat *scp, int state, int mask, int unlock);
static int update_kbd_leds(scr_stat *scp, int which);
static int sc_allocate_keyboard(sc_softc_t *sc, int unit);

/*
 * Console locking support functions.
 *
 * We use mutex spinlocks here in order to allow reentrancy which should
 * avoid issues during panics.
 *
 * A panic can stop a cpu while it is holding the syscons_mtx.  If this
 * occurs we try for up to 1/2 a second and then blow the spinlock away.
 * The asynchronous update thread makes this happen more often.
 */
static void
syscons_lock(void)
{
        if (panicstr || shutdown_in_progress) {
                int retries = 500000;
                while (mtx_spinlock_try(&syscons_mtx)) {
                        tsc_delay(1000);        /* 1uS */
                        if (--retries == 0) {
                                mtx_init(&syscons_mtx, "syscons");
                                retries = 500000;
                        }
                }
        } else {
                mtx_spinlock(&syscons_mtx);
        }
}

/*
 * Returns 0 on success, EAGAIN on failure.
 */
static int
syscons_lock_nonblock(void)
{
        return(mtx_spinlock_try(&syscons_mtx));
}

static void
syscons_unlock(void)
{
        mtx_spinunlock(&syscons_mtx);
}

/*
 * Console driver
 */
static cn_probe_t       sccnprobe;
static cn_init_t        sccninit;
static cn_init_t        sccninit_fini;
static cn_getc_t        sccngetc;
static cn_checkc_t      sccncheckc;
static cn_putc_t        sccnputc;
static cn_dbctl_t       sccndbctl;
static cn_term_t        sccnterm;
static cn_poll_t        sccnpoll;

CONS_DRIVER(sc, sccnprobe, sccninit, sccninit_fini, sccnterm,
            sccngetc, sccncheckc, sccnputc, sccndbctl, sccnpoll);

static  d_open_t        scopen;
static  d_close_t       scclose;
static  d_read_t        scread;
static  d_ioctl_t       scioctl;
static  d_mmap_t        scmmap;

static struct dev_ops sc_ops = {
        { "sc", 0, D_TTY | D_MPSAFE },
        .d_open =       scopen,
        .d_close =      scclose,
        .d_read =       scread,
        .d_write =      ttywrite,
        .d_ioctl =      scioctl,
        .d_mmap =       scmmap,
        .d_kqfilter =   ttykqfilter,
        .d_revoke =     ttyrevoke
};

int
sc_probe_unit(int unit, int flags)
{
    if ((flags & SC_EFI_FB) && (probe_efi_fb(0) != 0)) {
        if (bootverbose)
            kprintf("sc%d: no EFI framebuffer found.\n", unit);
        flags &= ~SC_EFI_FB;
    }

    if (!(flags & SC_EFI_FB) && !scvidprobe(unit, flags, FALSE)) {
        if (bootverbose)
            kprintf("sc%d: no video adapter found.\n", unit);
        return ENXIO;
    }

    /* syscons will be attached even when there is no keyboard */
    sckbdprobe(unit, flags, FALSE);

    return 0;
}

int
register_framebuffer(struct fb_info *info)
{
        sc_softc_t *sc;

        KKASSERT(info->depth <= 32);

        lwkt_gettoken(&vga_token);
        sc = sc_get_softc(0, (sc_console_unit == 0) ? SC_KERNEL_CONSOLE : 0);
        if (sc == NULL) {
                lwkt_reltoken(&vga_token);
                kprintf("%s: sc_get_softc(%d, %d) returned NULL\n", __func__,
                    0, (sc_console_unit == 0) ? SC_KERNEL_CONSOLE : 0);
                return 0;
        }

        /* Ignore this framebuffer if we already switched to KMS framebuffer */
        if (sc->fbi != NULL && sc->fbi != &efi_fb_info &&
            sc->fbi != sc->dummy_fb_info) {
                lwkt_reltoken(&vga_token);
                return 0;
        }

        if (sc->fb_set_par_task == NULL) {
                sc->fb_set_par_task = kmalloc(sizeof(struct task),
                    M_SYSCONS, M_WAITOK | M_ZERO);
        }
        TASK_INIT(sc->fb_set_par_task, 0, sc_fb_set_par, sc);
#if NSPLASH > 0
        if (sc->fb_blank_task == NULL) {
                sc->fb_blank_task = kmalloc(sizeof(struct task),
                    M_SYSCONS, M_WAITOK | M_ZERO);
        }
        TASK_INIT(sc->fb_blank_task, 0, sc_fb_blank, sc);
#endif /* NSPLASH */

        /*
         * Make sure that console messages don't interfere too much with
         * modesetting.
         */
        atomic_add_int(&sc->videoio_in_progress, 1);

        /* Lock against synchronous and asynchronous screen updates */
        lockmgr(&sc_asynctd_lk, LK_EXCLUSIVE);
        syscons_lock();
        sc->fbi = info;
        sc->fbi_generation++;
        syscons_unlock();

        kprintf("kms console: xpixels %d ypixels %d depth %d\n",
            sc->fbi->width, sc->fbi->height, sc->fbi->depth);
        sc_update_render(sc->cur_scp);
        if (info->fbops.fb_set_par != NULL)
                info->fbops.fb_set_par(info);
        atomic_add_int(&sc->videoio_in_progress, -1);

        sc->fb_blanked = FALSE;
        if (sc->unit == sc_console_unit && sc->cur_scp->smode.mode != VT_AUTO)
                cons_unavail = FALSE;
#if NSPLASH > 0
        if (info->fbops.fb_blank != NULL)
                add_scrn_saver(scframebuffer_saver);
#endif /* NSPLASH */

        lockmgr(&sc_asynctd_lk, LK_RELEASE);
        lwkt_reltoken(&vga_token);
        return 0;
}

void
unregister_framebuffer(struct fb_info *info)
{
        sc_softc_t *sc;

        lwkt_gettoken(&vga_token);
        sc = sc_get_softc(0, (sc_console_unit == 0) ? SC_KERNEL_CONSOLE : 0);
        if (sc == NULL) {
                lwkt_reltoken(&vga_token);
                kprintf("%s: sc_get_softc(%d, %d) returned NULL\n", __func__,
                    0, (sc_console_unit == 0) ? SC_KERNEL_CONSOLE : 0);
                return;
        }

        if (sc->fbi != info) {
                lwkt_reltoken(&vga_token);
                return;
        }

#if NSPLASH > 0
        if (info->fbops.fb_blank != NULL)
                remove_scrn_saver(scframebuffer_saver);
#endif /* NSPLASH */

        if (sc->fb_set_par_task != NULL &&
            taskqueue_cancel(taskqueue_thread[0], sc->fb_set_par_task, NULL)) {
                taskqueue_drain(taskqueue_thread[0], sc->fb_set_par_task);
        }
#if NSPLASH > 0
        if (sc->fb_blank_task != NULL &&
            taskqueue_cancel(taskqueue_thread[0], sc->fb_blank_task, NULL)) {
                taskqueue_drain(taskqueue_thread[0], sc->fb_blank_task);
        }
#endif /* NSPLASH */
        sc->fb_blanked = TRUE;
        if (sc->unit == sc_console_unit)
                cons_unavail = TRUE;

        if (sc->dummy_fb_info == NULL) {
                sc->dummy_fb_info = kmalloc(sizeof(struct fb_info),
                    M_SYSCONS, M_WAITOK | M_ZERO);
        } else {
                memset(sc->dummy_fb_info, 0, sizeof(struct fb_info));
        }
        *sc->dummy_fb_info = *sc->fbi;
        sc->dummy_fb_info->vaddr = 0;
        sc->dummy_fb_info->fbops.fb_set_par = NULL;
        sc->dummy_fb_info->fbops.fb_blank = NULL;
        sc->dummy_fb_info->fbops.fb_debug_enter = NULL;

        /* Lock against synchronous and asynchronous screen updates */
        lockmgr(&sc_asynctd_lk, LK_EXCLUSIVE);
        syscons_lock();
        sc->fbi = sc->dummy_fb_info;
        syscons_unlock();
        lockmgr(&sc_asynctd_lk, LK_RELEASE);

        lwkt_reltoken(&vga_token);
}

void
sc_font_scale(scr_stat *scp, int max_cols, int max_rows)
{
        int cols, rows;

        /*
         * If columns not specified in /boot/loader.conf then
         * calculate a non-fractional scaling that yields a
         * reasonable number of rows and columns. If it is <0,
         * don't scale at all.
         */
        if (desired_cols == 0) {
                int nomag = 1;
                while (scp->xpixel / (scp->font_width * nomag) >= COL &&
                       scp->ypixel / (scp->font_height * nomag) >= ROW) {
                        ++nomag;
                }
                if (nomag > 1)
                        --nomag;
                cols = scp->xpixel / (scp->font_width * nomag);
        } else if (desired_cols < 0) {
                cols = scp->xpixel / scp->font_width;
        } else {
                cols = desired_cols;
        }
        scp->blk_width = scp->xpixel / cols;
        scp->blk_height = scp->blk_width * scp->font_height / scp->font_width;
        rows = scp->ypixel / scp->blk_height;

        /* scp->xsize = scp->xpixel / scp->blk_width; total possible */
        scp->xsize = max_cols ? imin(max_cols, cols) : cols;
        scp->ysize = max_rows ? imin(max_rows, rows) : rows;
}

/* 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_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];
}

int
sc_attach_unit(int unit, int flags)
{
    sc_softc_t *sc;
    scr_stat *scp;
    int vc;
    cdev_t dev;
    flags &= ~SC_KERNEL_CONSOLE;
    char tbuf[MAKEDEV_MINNBUF];

    if ((flags & SC_EFI_FB) && probe_efi_fb(0) != 0)
        flags &= ~SC_EFI_FB;

    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);

        if (sc_console->tsw->te_size > 0) {
            /* assert(sc_console->ts != NULL); */
            kernel_console_ts = sc_console->ts;
            sc_console->ts = kmalloc(sc_console->tsw->te_size,
                                    M_SYSCONS, M_WAITOK);
            bcopy(kernel_console_ts, sc_console->ts, sc_console->tsw->te_size);
            (*sc_console->tsw->te_default_attr)(sc_console,
                                                user_default.std_color,
                                                user_default.rev_color);
        }
    } else {
        scinit(unit, flags);
    }

    sc = sc_get_softc(unit, flags & SC_KERNEL_CONSOLE);

    /*
     * If this is the console we couldn't setup sc->dev before because
     * malloc wasn't working.  Set it up now.
     */
    if (flags & SC_KERNEL_CONSOLE) {
        KKASSERT(sc->dev == NULL);
        sc->dev = kmalloc(sizeof(cdev_t)*sc->vtys, M_SYSCONS, M_WAITOK|M_ZERO);
        sc->dev[0] = make_dev(&sc_ops, sc_console_unit*MAXCONS, UID_ROOT,
                              GID_WHEEL, 0600, "ttyv%s", makedev_unit_b32(tbuf,
                              sc_console_unit * MAXCONS));
        ttymalloc(&sc->dev[0]->si_tty);
        sc->dev[0]->si_drv1 = sc_console;
    }

    /*
     * Finish up the standard attach
     */
    sc->config = flags;
    callout_init_mp(&sc->scrn_timer_ch);
    scp = SC_STAT(sc->dev[0]);
    if (sc_console == NULL)     /* sc_console_unit < 0 */
        sc_console = scp;

    /* initialize cursor */
    if (!ISGRAPHSC(scp))
        update_cursor_image(scp);

    /* get screen update going */
    scrn_timer(sc);

    /* set up the keyboard */
    kbd_ioctl(sc->kbd, KDSKBMODE, (caddr_t)&scp->kbd_mode);
    update_kbd_state(scp, scp->status, LOCK_MASK, FALSE);

    kprintf("sc%d: %s <%d virtual consoles, flags=0x%x>\n",
            unit, (sc->config & SC_EFI_FB) ? "EFI_FB" : adapter_name(sc->adp),
            sc->vtys, sc->config);
    if (bootverbose) {
        kprintf("sc%d:", unit);
        if (sc->adapter >= 0)
            kprintf(" fb%d", sc->adapter);
        if (sc->keyboard >= 0)
            kprintf(", kbd%d", sc->keyboard);
        if (scp->tsw)
            kprintf(", terminal emulator: %s (%s)",
                   scp->tsw->te_name, scp->tsw->te_desc);
        kprintf("\n");
    }

    /* register a shutdown callback for the kernel console */
    if (sc_console_unit == unit)
        EVENTHANDLER_REGISTER(shutdown_pre_sync, scshutdown, 
                              (void *)(uintptr_t)unit, SHUTDOWN_PRI_DEFAULT);

    /* 
     * create devices.
     *
     * The first vty already has struct tty and scr_stat initialized
     * in scinit().  The other vtys will have these structs when
     * first opened.
     */
    for (vc = 1; vc < sc->vtys; vc++) {
        dev = make_dev(&sc_ops, vc + unit * MAXCONS,
                        UID_ROOT, GID_WHEEL, 0600, "ttyv%s",
                        makedev_unit_b32(tbuf, vc + unit * MAXCONS));
        sc->dev[vc] = dev;
    }
    cctl_dev = make_dev(&sc_ops, SC_CONSOLECTL,
                        UID_ROOT, GID_WHEEL, 0600, "consolectl");
    cctl_dev->si_tty = ttymalloc(&sc_console_tty);
    cctl_dev->si_drv1 = sc_console;
    return 0;
}

static void
scmeminit(void *arg)
{
    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, TRUE, FALSE);

#ifndef SC_NO_CUTPASTE
    sc_alloc_cut_buffer(sc_console, TRUE);
#endif

#ifndef SC_NO_HISTORY
    /* initialize history buffer & pointers */
    sc_alloc_history_buffer(sc_console, 0, 0, TRUE);
#endif

    /* Fill initial terminal border, efi_fb_info.vaddr should be non-NULL now */
    if (!sc_filled_border) {
        sc_filled_border = TRUE;
        sc_set_border(sc_console, sc_console->border);
    }
}

SYSINIT(sc_mem, SI_BOOT1_POST, SI_ORDER_ANY, scmeminit, NULL);

static int
scdevtounit(cdev_t dev)
{
    int vty = SC_VTY(dev);

    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
scopen(struct dev_open_args *ap)
{
    cdev_t dev = ap->a_head.a_dev;
    int unit;
    sc_softc_t *sc;
    struct tty *tp;
    scr_stat *scp;
    keyarg_t key;
    int error;

    /*
     * Disallow root access to ttyv* console device if RESTRICTEDROOT
     * because root cred will match inside jails and its too dangerous
     * for that.
     *
     * However, we have to specify __SYSCAP_NOROOTTEST to allow non-root
     * accesses when using RESTRICTROOT (when creds match).
     */
    if (caps_priv_check(ap->a_cred, SYSCAP_RESTRICTEDROOT | __SYSCAP_NOROOTTEST))
        return (EPERM);

    lwkt_gettoken(&vga_token);
    unit = scdevtounit(dev);
    DPRINTF(5, ("scopen: dev:%d,%d, unit:%d, vty:%d\n",
                major(dev), minor(dev), unit, SC_VTY(dev)));

    sc = sc_get_softc(unit, (sc_console_unit == unit) ? SC_KERNEL_CONSOLE : 0);
    if (sc == NULL) {
        lwkt_reltoken(&vga_token);
        return ENXIO;
    }

    tp = ttymalloc(&dev->si_tty);
    lwkt_gettoken(&tp->t_token);
    tp->t_oproc = scstart;
    tp->t_param = scparam;
    tp->t_stop = nottystop;

    tp->t_dev = dev;

    if (!ISTTYOPEN(tp)) {
        ttychars(tp);
        /* Use the current setting of the <-- key as default VERASE. */  
        /* If the Delete key is preferable, an stty is necessary     */
        if (sc->kbd != NULL) {
            key.keynum = KEYCODE_BS;
            kbd_ioctl(sc->kbd, GIO_KEYMAPENT, (caddr_t)&key);
            tp->t_cc[VERASE] = key.key.map[0];
        }
        tp->t_iflag = TTYDEF_IFLAG;
        tp->t_oflag = TTYDEF_OFLAG;
        tp->t_cflag = TTYDEF_CFLAG;
        tp->t_lflag = TTYDEF_LFLAG;
        tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
        scparam(tp, &tp->t_termios);
        (*linesw[tp->t_line].l_modem)(tp, 1);
    }
    else
        if ((tp->t_state & TS_XCLUDE) &&
            caps_priv_check(ap->a_cred, SYSCAP_RESTRICTEDROOT))
        {
            lwkt_reltoken(&tp->t_token);
            lwkt_reltoken(&vga_token);
            return(EBUSY);
        }

    error = (*linesw[tp->t_line].l_open)(dev, tp);

    scp = SC_STAT(dev);
    if (scp == NULL) {
        scp = dev->si_drv1 = alloc_scp(sc, SC_VTY(dev));
        syscons_lock();
        if (ISGRAPHSC(scp))
            sc_set_pixel_mode(scp, NULL, COL, ROW, 16);
        syscons_unlock();
    }
    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;
    }

    /*
     * Start optional support thread for syscons refreshes.  This thread
     * will execute the refresh without the syscons_lock held and will
     * allow interrupts while it is doing so.
     */
    if (scp->asynctd == NULL) {
            lwkt_create(scrn_update_thread, scp, &scp->asynctd, NULL, 0, -1,
                        "syscons%d", SC_VTY(dev));
    }
    lwkt_reltoken(&tp->t_token);
    lwkt_reltoken(&vga_token);

    return error;
}

static int
scclose(struct dev_close_args *ap)
{
    cdev_t dev = ap->a_head.a_dev;
    struct tty *tp = dev->si_tty;
    scr_stat *scp;

    lwkt_gettoken(&vga_token);
    lwkt_gettoken(&tp->t_token);
    if (SC_VTY(dev) != SC_CONSOLECTL) {
        scp = SC_STAT(tp->t_dev);
        /* were we in the middle of the VT switching process? */
        DPRINTF(5, ("sc%d: scclose(), ", scp->sc->unit));
        if ((scp == scp->sc->cur_scp) && (scp->sc->unit == sc_console_unit) &&
            !scp->sc->fb_blanked) {
            cons_unavail = FALSE;
        }
        if (finish_vt_rel(scp, TRUE) == 0)      /* force release */
            DPRINTF(5, ("reset WAIT_REL, "));
        if (finish_vt_acq(scp) == 0)            /* force acknowledge */
            DPRINTF(5, ("reset WAIT_ACQ, "));
        syscons_lock();
#if 0 /* notyet */
        if (scp == &main_console) {
            scp->pid = 0;
            scp->proc = NULL;
            scp->smode.mode = VT_AUTO;
        }
        else {
            sc_vtb_destroy(&scp->vtb);
            sc_vtb_destroy(&scp->scr);
            sc_free_history_buffer(scp, scp->ysize);
            SC_STAT(dev) = NULL;
            kfree(scp, M_SYSCONS);
        }
#else
        scp->pid = 0;
        scp->proc = NULL;
        scp->smode.mode = VT_AUTO;
#endif
        scp->kbd_mode = K_XLATE;
        syscons_unlock();
        if (scp == scp->sc->cur_scp)
            kbd_ioctl(scp->sc->kbd, KDSKBMODE, (caddr_t)&scp->kbd_mode);
        DPRINTF(5, ("done.\n"));
    }
    (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
    ttyclose(tp);
    lwkt_reltoken(&tp->t_token);
    lwkt_reltoken(&vga_token);

    return(0);
}

static int
scread(struct dev_read_args *ap)
{
    int ret;

    lwkt_gettoken(&vga_token);
    sc_touch_scrn_saver();
    ret = ttyread(ap);
    lwkt_reltoken(&vga_token);
    return ret;
}

static int
sckbdevent(keyboard_t *thiskbd, int event, void *arg)
{
    sc_softc_t *sc;
    struct tty *cur_tty;
    int c; 
    size_t len;
    u_char *cp;

    lwkt_gettoken(&vga_token);
    /*
     * WARNING: In early boot sc->dev may not be setup yet.
     */
    sc = (sc_softc_t *)arg;
    /* assert(thiskbd == sc->kbd) */

    switch (event) {
    case KBDIO_KEYINPUT:
        if (sc->kbd && sc->kbd->kb_flags & KB_POLLED) {
                lwkt_reltoken(&vga_token);
                return 0;
        }
        break;
    case KBDIO_UNLOADING:
        syscons_lock();
        sc->kbd = NULL;
        sc->keyboard = -1;
        syscons_unlock();
        kbd_release(thiskbd, (void *)&sc->keyboard);
        lwkt_reltoken(&vga_token);
        return 0;
    default:
        lwkt_reltoken(&vga_token);
        return EINVAL;
    }

    /* 
     * 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 = VIRTUAL_TTY(sc, sc->cur_scp->index);
        if (!ISTTYOPEN(cur_tty)) {
            cur_tty = sc_console_tty;
            if (!ISTTYOPEN(cur_tty))
                continue;
        }

        syscons_lock();
        if ((*sc->cur_scp->tsw->te_input)(sc->cur_scp, c, cur_tty)) {
            syscons_unlock();
            continue;
        }
        syscons_unlock();

        lwkt_gettoken(&cur_tty->t_token);

        switch (KEYFLAGS(c)) {
        case 0x0000: /* normal key */
            (*linesw[cur_tty->t_line].l_rint)(KEYCHAR(c), cur_tty);
            break;
        case FKEY:  /* function key, return string */
            cp = kbd_get_fkeystr(thiskbd, KEYCHAR(c), &len);
            if (cp != NULL) {
                while (len-- >  0)
                    (*linesw[cur_tty->t_line].l_rint)(*cp++, cur_tty);
            }
            break;
        case MKEY:  /* meta is active, prepend ESC */
            (*linesw[cur_tty->t_line].l_rint)(0x1b, cur_tty);
            (*linesw[cur_tty->t_line].l_rint)(KEYCHAR(c), cur_tty);
            break;
        case BKEY:  /* backtab fixed sequence (esc [ Z) */
            (*linesw[cur_tty->t_line].l_rint)(0x1b, cur_tty);
            (*linesw[cur_tty->t_line].l_rint)('[', cur_tty);
            (*linesw[cur_tty->t_line].l_rint)('Z', cur_tty);
            break;
        }
        lwkt_reltoken(&cur_tty->t_token);
    }

    syscons_lock();
    sc->cur_scp->status |= MOUSE_HIDDEN;
    syscons_unlock();

    lwkt_reltoken(&vga_token);
    return 0;
}

static int
scparam(struct tty *tp, struct termios *t)
{
    lwkt_gettoken(&tp->t_token);
    tp->t_ispeed = t->c_ispeed;
    tp->t_ospeed = t->c_ospeed;
    tp->t_cflag = t->c_cflag;
    lwkt_reltoken(&tp->t_token);

    return 0;
}

static int
scioctl(struct dev_ioctl_args *ap)
{
    cdev_t dev = ap->a_head.a_dev;
    u_long cmd = ap->a_cmd;
    caddr_t data = ap->a_data;
    int flag = ap->a_fflag;
    int error;
    int i;
    struct tty *tp;
    sc_softc_t *sc;
    scr_stat *scp;

    lwkt_gettoken(&vga_token);
    tp = dev->si_tty;

    error = sc_vid_ioctl(tp, cmd, data, flag);
    if (error != ENOIOCTL) {
        lwkt_reltoken(&vga_token);
        return error;
    }

#ifndef SC_NO_HISTORY
    error = sc_hist_ioctl(tp, cmd, data, flag);
    if (error != ENOIOCTL) {
        lwkt_reltoken(&vga_token);
        return error;
    }
#endif

#ifndef SC_NO_SYSMOUSE
    error = sc_mouse_ioctl(tp, cmd, data, flag);
    if (error != ENOIOCTL) {
        lwkt_reltoken(&vga_token);
        return error;
    }
#endif

    scp = SC_STAT(tp->t_dev);
    /* assert(scp != NULL) */
    /* scp is sc_console, if SC_VTY(dev) == SC_CONSOLECTL. */
    sc = scp->sc;

    if (scp->tsw) {
        syscons_lock();
        error = (*scp->tsw->te_ioctl)(scp, tp, cmd, data, flag);
        syscons_unlock();
        if (error != ENOIOCTL) {
            lwkt_reltoken(&vga_token);
            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 */
        lwkt_reltoken(&vga_token);
        return ENOTTY;

    case GIO_COLOR:             /* is this a color console ? */
        if (sc->fbi != NULL)
            *(int *)data = 1;
        else
            *(int *)data = (sc->adp->va_flags & V_ADP_COLOR) ? 1 : 0;
        lwkt_reltoken(&vga_token);
        return 0;

    case CONS_BLANKTIME:        /* set screen saver timeout (0 = no saver) */
        if (*(int *)data < 0 || *(int *)data > MAX_BLANKTIME) {
            lwkt_reltoken(&vga_token);
            return EINVAL;
        }
        syscons_lock();
        scrn_blank_time = *(int *)data;
        run_scrn_saver = (scrn_blank_time != 0);
        syscons_unlock();
        lwkt_reltoken(&vga_token);
        return 0;

    case CONS_CURSORTYPE:       /* set cursor type blink/noblink */
        syscons_lock();
        if (!ISGRAPHSC(sc->cur_scp))
            sc_remove_cursor_image(sc->cur_scp);
        if ((*(int*)data) & 0x01)
            sc->flags |= SC_BLINK_CURSOR;
        else
            sc->flags &= ~SC_BLINK_CURSOR;
        if ((*(int*)data) & 0x02) {
            sc->flags |= SC_CHAR_CURSOR;
        } else
            sc->flags &= ~SC_CHAR_CURSOR;
        /* 
         * The cursor shape is global property; all virtual consoles
         * are affected. Update the cursor in the current console...
         */
        if (!ISGRAPHSC(sc->cur_scp)) {
            sc_set_cursor_image(sc->cur_scp);
            sc_draw_cursor_image(sc->cur_scp);
        }
        syscons_unlock();
        lwkt_reltoken(&vga_token);
        return 0;

    case CONS_BELLTYPE:         /* set bell type sound/visual */
        syscons_lock();

        if ((*(int *)data) & 0x01)
            sc->flags |= SC_VISUAL_BELL;
        else
            sc->flags &= ~SC_VISUAL_BELL;

        if ((*(int *)data) & 0x02)
            sc->flags |= SC_QUIET_BELL;
        else
            sc->flags &= ~SC_QUIET_BELL;

        syscons_unlock();
        lwkt_reltoken(&vga_token);
        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_height;
            ptr->mv_col = scp->xpos;
            ptr->mv_row = scp->ypos;
            ptr->mv_csz = scp->xsize;
            ptr->mv_rsz = scp->ysize;
            /*
             * 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, FALSE);
            ptr->mk_keylock = scp->status & LOCK_MASK;
            lwkt_reltoken(&vga_token);
            return 0;
        }
        lwkt_reltoken(&vga_token);
        return EINVAL;
    }

    case CONS_GETVERS:          /* get version number */
        *(int*)data = 0x200;    /* version 2.0 */
        lwkt_reltoken(&vga_token);
        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));
        lwkt_reltoken(&vga_token);
        return 0;

    case CONS_SAVERMODE:        /* set saver mode */
        switch(*(int *)data) {
        case CONS_NO_SAVER:
        case CONS_USR_SAVER:
            syscons_lock();
            /* if a LKM screen saver is running, stop it first. */
            scsplash_stick(FALSE);
            saver_mode = *(int *)data;
#if NSPLASH > 0
            if ((error = wait_scrn_saver_stop(NULL, TRUE))) {
                syscons_unlock();
                lwkt_reltoken(&vga_token);
                return error;
            }
#endif /* NSPLASH */
            run_scrn_saver = TRUE;
            if (saver_mode == CONS_USR_SAVER)
                scp->status |= SAVER_RUNNING;
            else
                scp->status &= ~SAVER_RUNNING;
            scsplash_stick(TRUE);
            syscons_unlock();
            break;
        case CONS_LKM_SAVER:
            syscons_lock();
            if ((saver_mode == CONS_USR_SAVER) && (scp->status & SAVER_RUNNING))
                scp->status &= ~SAVER_RUNNING;
            saver_mode = *(int *)data;
            syscons_unlock();
            break;
        default:
            lwkt_reltoken(&vga_token);
            return EINVAL;
        }
        lwkt_reltoken(&vga_token);
        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...
         */
        syscons_lock();
        run_scrn_saver = (*(int *)data != 0);
        if (run_scrn_saver)
            sc->scrn_time_stamp -= scrn_blank_time;
        syscons_unlock();
        lwkt_reltoken(&vga_token);
        return 0;

    case CONS_SCRSHOT:          /* get a screen shot */
    {
        scrshot_t *ptr = (scrshot_t*)data;
        syscons_lock();
        if (ISGRAPHSC(scp)) {
            syscons_unlock();
            lwkt_reltoken(&vga_token);
            return EOPNOTSUPP;
        }
        if (scp->xsize != ptr->xsize || scp->ysize != ptr->ysize) {
            syscons_unlock();
            lwkt_reltoken(&vga_token);
            return EINVAL;
        }
        syscons_unlock();
        copyout ((void*)scp->vtb.vtb_buffer, ptr->buf,
                 ptr->xsize * ptr->ysize * sizeof(uint16_t));
        lwkt_reltoken(&vga_token);
        return 0;
    }

    case VT_SETMODE:            /* set screen switcher mode */
    {
        struct vt_mode *mode;

        mode = (struct vt_mode *)data;
        DPRINTF(5, ("sc%d: VT_SETMODE ", sc->unit));
        if (scp->smode.mode == VT_PROCESS) {
            if (scp->proc == pfindn(scp->pid) && scp->proc != curproc) {
                DPRINTF(5, ("error EPERM\n"));
                lwkt_reltoken(&vga_token);
                return EPERM;
            }
        }
        syscons_lock();
        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) &&
                !sc->fb_blanked) {
                cons_unavail = FALSE;
            }
            if (finish_vt_rel(scp, TRUE) == 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)) {
                syscons_unlock();
                DPRINTF(5, ("error EINVAL\n"));
                lwkt_reltoken(&vga_token);
                return EINVAL;
            }
            DPRINTF(5, ("VT_PROCESS %d, ", curproc->p_pid));
            bcopy(data, &scp->smode, sizeof(struct vt_mode));
            scp->proc = curproc;
            scp->pid = scp->proc->p_pid;
            if ((scp == sc->cur_scp) && (sc->unit == sc_console_unit))
                cons_unavail = TRUE;
        }
        syscons_unlock();
        DPRINTF(5, ("\n"));
        lwkt_reltoken(&vga_token);
        return 0;
    }

    case VT_GETMODE:            /* get screen switcher mode */
        bcopy(&scp->smode, data, sizeof(struct vt_mode));
        lwkt_reltoken(&vga_token);
        return 0;

    case VT_RELDISP:            /* screen switcher ioctl */
        /*
         * This must be the current vty which is in the VT_PROCESS
         * switching mode...
         */
        syscons_lock();
        if ((scp != sc->cur_scp) || (scp->smode.mode != VT_PROCESS)) {
            syscons_unlock();
            lwkt_reltoken(&vga_token);
            return EINVAL;
        }
        /* ...and this process is controlling it. */
        if (scp->proc != curproc) {
            syscons_unlock();
            lwkt_reltoken(&vga_token);
            return EPERM;
        }
        error = EINVAL;
        switch(*(int *)data) {
        case VT_FALSE:          /* user refuses to release screen, abort */
            if ((error = finish_vt_rel(scp, FALSE)) == 0)
                DPRINTF(5, ("sc%d: VT_FALSE\n", sc->unit));
            break;
        case VT_TRUE:           /* user has released screen, go on */
            if ((error = finish_vt_rel(scp, TRUE)) == 0)
                DPRINTF(5, ("sc%d: VT_TRUE\n", sc->unit));
            break;
        case VT_ACKACQ:         /* acquire acknowledged, switch completed */
            if ((error = finish_vt_acq(scp)) == 0)
                DPRINTF(5, ("sc%d: VT_ACKACQ\n", sc->unit));
            syscons_unlock();
            /* Wait for drm modesetting callback to finish. */
            lwkt_reltoken(&vga_token);
            if (sc->fb_set_par_task != NULL)
                taskqueue_drain(taskqueue_thread[0], sc->fb_set_par_task);
            return error;
        default:
            break;
        }
        syscons_unlock();
        lwkt_reltoken(&vga_token);
        return error;

    case VT_OPENQRY:            /* return free virtual console */
        for (i = sc->first_vty; i < sc->first_vty + sc->vtys; i++) {
            tp = VIRTUAL_TTY(sc, i);
            if (!ISTTYOPEN(tp)) {
                *(int *)data = i + 1;
                lwkt_reltoken(&vga_token);
                return 0;
            }
        }
        lwkt_reltoken(&vga_token);
        return EINVAL;

    case VT_ACTIVATE:           /* switch to screen *data */
        i = (*(int *)data == 0) ? scp->index : (*(int *)data - 1);
        syscons_lock();
        sc_clean_up(sc->cur_scp, TRUE);
        error = sc_switch_scr(sc, i);
        syscons_unlock();
        lwkt_reltoken(&vga_token);
        return error;

    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)) {
            lwkt_reltoken(&vga_token);
            return EINVAL;
        }
        syscons_lock();
        error = sc_clean_up(sc->cur_scp, TRUE);
        syscons_unlock();
        if (error) {
            lwkt_reltoken(&vga_token);
            return error;
        }

        /*
         * scp might be NULL, we aren't sure why.  Check for NULL.
         *
         * http://bugs.dragonflybsd.org/issues/2481
         */
        scp = SC_STAT(SC_DEV(sc, i));
        if (scp == NULL || scp == scp->sc->cur_scp) {
            lwkt_reltoken(&vga_token);
            return 0;
        }
        error = tsleep((caddr_t)&scp->smode, PCATCH, "waitvt", 0);
        /* May return ERESTART */
        lwkt_reltoken(&vga_token);
        /* Wait for drm modesetting callback to finish. */
        if (sc->fb_set_par_task != NULL)
            taskqueue_drain(taskqueue_thread[0], sc->fb_set_par_task);
        return error;

    case VT_GETACTIVE:          /* get active vty # */
        *(int *)data = sc->cur_scp->index + 1;
        lwkt_reltoken(&vga_token);
        return 0;

    case VT_GETINDEX:           /* get this vty # */
        *(int *)data = scp->index + 1;
        lwkt_reltoken(&vga_token);
        return 0;

    case VT_LOCKSWITCH:         /* prevent vty switching */
        syscons_lock();
        if ((*(int *)data) & 0x01)
            sc->flags |= SC_SCRN_VTYLOCK;
        else
            sc->flags &= ~SC_SCRN_VTYLOCK;
        syscons_unlock();
        lwkt_reltoken(&vga_token);
        return 0;

    case KDENABIO:              /* allow io operations */
        error = caps_priv_check(ap->a_cred, SYSCAP_RESTRICTEDROOT);
        if (error != 0) {
            lwkt_reltoken(&vga_token);
            return error;
        }
        if (securelevel > 0) {
            lwkt_reltoken(&vga_token);
            return EPERM;
        }
#if defined(__x86_64__)
        curthread->td_lwp->lwp_md.md_regs->tf_rflags |= PSL_IOPL;
#endif
        lwkt_reltoken(&vga_token);
        return 0;

    case KDDISABIO:             /* disallow io operations (default) */
#if defined(__x86_64__)
        curthread->td_lwp->lwp_md.md_regs->tf_rflags &= ~PSL_IOPL;
#endif
        lwkt_reltoken(&vga_token);
        return 0;

    case KDSKBSTATE:            /* set keyboard state (locks) */
        if (*(int *)data & ~LOCK_MASK) {
            lwkt_reltoken(&vga_token);
            return EINVAL;
        }
        syscons_lock();
        scp->status &= ~LOCK_MASK;
        scp->status |= *(int *)data;
        syscons_unlock();
        if (scp == sc->cur_scp)
            update_kbd_state(scp, scp->status, LOCK_MASK, FALSE);
        lwkt_reltoken(&vga_token);
        return 0;

    case KDGKBSTATE:            /* get keyboard state (locks) */
        if (scp == sc->cur_scp)
            save_kbd_state(scp, FALSE);
        *(int *)data = scp->status & LOCK_MASK;
        lwkt_reltoken(&vga_token);
        return 0;

    case KDGETREPEAT:           /* get keyboard repeat & delay rates */
    case KDSETREPEAT:           /* set keyboard repeat & delay rates (new) */
        error = kbd_ioctl(sc->kbd, cmd, data);
        if (error == ENOIOCTL)
            error = ENODEV;
        lwkt_reltoken(&vga_token);
        return error;

    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)
                kbd_ioctl(sc->kbd, cmd, data);
            lwkt_reltoken(&vga_token);
            return 0;
        default:
            lwkt_reltoken(&vga_token);
            return EINVAL;
        }
        /* NOT REACHED */

    case KDGKBMODE:             /* get keyboard mode */
        *(int *)data = scp->kbd_mode;
        lwkt_reltoken(&vga_token);
        return 0;

    case KDGKBINFO:
        error = kbd_ioctl(sc->kbd, cmd, data);
        if (error == ENOIOCTL)
            error = ENODEV;
        lwkt_reltoken(&vga_token);
        return error;

    case KDMKTONE:              /* sound the bell */
        syscons_lock();
        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);
        syscons_unlock();
        lwkt_reltoken(&vga_token);
        return 0;

    case KIOCSOUND:             /* make tone (*data) hz */
        syscons_lock();
        if (scp == sc->cur_scp) {
            if (*(int *)data) {
                error = sc_tone(*(int *)data);
            } else {
                error = sc_tone(0);
            }
        } else {
            error = 0;
        }
        syscons_unlock();
        lwkt_reltoken(&vga_token);
        return error;

    case KDGKBTYPE:             /* get keyboard type */
        error = kbd_ioctl(sc->kbd, cmd, data);
        if (error == ENOIOCTL) {
            /* always return something? XXX */
            *(int *)data = 0;
        }
        lwkt_reltoken(&vga_token);
        return 0;

    case KDSETLED:              /* set keyboard LED status */
        if (*(int *)data & ~LED_MASK) { /* FIXME: LOCK_MASK? */
            lwkt_reltoken(&vga_token);
            return EINVAL;
        }
        syscons_lock();
        scp->status &= ~LED_MASK;
        scp->status |= *(int *)data;
        syscons_unlock();
        if (scp == sc->cur_scp)
            update_kbd_leds(scp, scp->status);
        lwkt_reltoken(&vga_token);
        return 0;

    case KDGETLED:              /* get keyboard LED status */
        if (scp == sc->cur_scp)
            save_kbd_state(scp, FALSE);
        *(int *)data = scp->status & LED_MASK;
        lwkt_reltoken(&vga_token);
        return 0;

        case KBADDKBD:              /* add/remove keyboard to/from mux */
        case KBRELKBD:
                error = kbd_ioctl(sc->kbd, cmd, data);
                if (error == ENOIOCTL)
                        error = ENODEV;
                lwkt_reltoken(&vga_token);
                return error;

    case CONS_SETKBD:           /* set the new keyboard */
        {
            keyboard_t *newkbd;

            newkbd = kbd_get_keyboard(*(int *)data);
            if (newkbd == NULL) {
                lwkt_reltoken(&vga_token);
                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, FALSE);
                        kbd_release(sc->kbd, (void *)&sc->keyboard);
                    }
                    syscons_lock();
                    sc->kbd = kbd_get_keyboard(i); /* sc->kbd == newkbd */
                    sc->keyboard = i;
                    syscons_unlock();
                    kbd_ioctl(sc->kbd, KDSKBMODE,
                              (caddr_t)&sc->cur_scp->kbd_mode);
                    update_kbd_state(sc->cur_scp, sc->cur_scp->status,
                        LOCK_MASK, FALSE);
                } else {
                    error = EPERM;      /* XXX */
                }
            }
            lwkt_reltoken(&vga_token);
            return error;
        }

    case CONS_RELKBD:           /* release the current keyboard */
        error = 0;
        if (sc->kbd != NULL) {
            save_kbd_state(sc->cur_scp, FALSE);
            error = kbd_release(sc->kbd, (void *)&sc->keyboard);
            if (error == 0) {
                syscons_lock();
                sc->kbd = NULL;
                sc->keyboard = -1;
                syscons_unlock();
            }
        }
        lwkt_reltoken(&vga_token);
        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;
                lwkt_reltoken(&vga_token);
                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;
                lwkt_reltoken(&vga_token);
                return EINVAL;
            }
        }

    case CONS_SETTERM:          /* set the current terminal emulator */
        syscons_lock();
        error = sc_init_emulator(scp, ((term_info_t *)data)->ti_name);
        /* FIXME: what if scp == sc_console! XXX */
        syscons_unlock();
        lwkt_reltoken(&vga_token);
        return error;

    case GIO_SCRNMAP:           /* get output translation table */
        bcopy(&sc->scr_map, data, sizeof(sc->scr_map));
        lwkt_reltoken(&vga_token);
        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;
        }
        lwkt_reltoken(&vga_token);
        return 0;

    case GIO_KEYMAP:            /* get keyboard translation table */
    case PIO_KEYMAP:            /* set keyboard translation table */
    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 = kbd_ioctl(sc->kbd, cmd, data);
        if (error == ENOIOCTL)
            error = ENODEV;
        lwkt_reltoken(&vga_token);
        return error;

#ifndef SC_NO_FONT_LOADING

    case PIO_FONT8x8:           /* set 8x8 dot font */
        if (sc->fbi == NULL && !ISFONTAVAIL(sc->adp->va_flags)) {
            lwkt_reltoken(&vga_token);
            return ENXIO;
        }
        syscons_lock();
        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 (sc->fbi == NULL
            && ISTEXTSC(sc->cur_scp) && (sc->cur_scp->font_height < 14)) {
            sc_load_font(sc->cur_scp, 0, 8, sc->font_8, 0, 256);
        }
        syscons_unlock();
        lwkt_reltoken(&vga_token);
        return 0;

    case GIO_FONT8x8:           /* get 8x8 dot font */
        if (sc->fbi == NULL && !ISFONTAVAIL(sc->adp->va_flags)) {
            lwkt_reltoken(&vga_token);
            return ENXIO;
        }
        if (sc->fonts_loaded & FONT_8) {
            bcopy(sc->font_8, data, 8*256);
            lwkt_reltoken(&vga_token);
            return 0;
        }
        else {
            lwkt_reltoken(&vga_token);
            return ENXIO;
        }

    case PIO_FONT8x14:          /* set 8x14 dot font */
        if (sc->fbi == NULL && !ISFONTAVAIL(sc->adp->va_flags)) {
            lwkt_reltoken(&vga_token);
            return ENXIO;
        }
        syscons_lock();
        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 (sc->fbi == NULL
            && ISTEXTSC(sc->cur_scp)
            && (sc->cur_scp->font_height >= 14)
            && (sc->cur_scp->font_height < 16)) {
            sc_load_font(sc->cur_scp, 0, 14, sc->font_14, 0, 256);
        }
        syscons_unlock();
        lwkt_reltoken(&vga_token);
        return 0;

    case GIO_FONT8x14:          /* get 8x14 dot font */
        if (sc->fbi == NULL && !ISFONTAVAIL(sc->adp->va_flags)) {
            lwkt_reltoken(&vga_token);
            return ENXIO;
        }
        if (sc->fonts_loaded & FONT_14) {
            bcopy(sc->font_14, data, 14*256);
            lwkt_reltoken(&vga_token);
            return 0;
        }
        else {
            lwkt_reltoken(&vga_token);
            return ENXIO;
        }

    case PIO_FONT8x16:          /* set 8x16 dot font */
        if (sc->fbi == NULL && !ISFONTAVAIL(sc->adp->va_flags)) {
            lwkt_reltoken(&vga_token);
            return ENXIO;
        }
        syscons_lock();
        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 (sc->fbi == NULL
            && ISTEXTSC(sc->cur_scp) && (sc->cur_scp->font_height >= 16))  {
            sc_load_font(sc->cur_scp, 0, 16, sc->font_16, 0, 256);
        }
        syscons_unlock();
        lwkt_reltoken(&vga_token);
        return 0;

    case GIO_FONT8x16:          /* get 8x16 dot font */
        if (sc->fbi == NULL && !ISFONTAVAIL(sc->adp->va_flags)) {
            lwkt_reltoken(&vga_token);
            return ENXIO;
        }
        if (sc->fonts_loaded & FONT_16) {
            bcopy(sc->font_16, data, 16*256);
            lwkt_reltoken(&vga_token);
            return 0;
        }
        else {
            lwkt_reltoken(&vga_token);
            return ENXIO;
        }

#endif /* SC_NO_FONT_LOADING */

    default:
        break;
    }

    lwkt_gettoken(&tp->t_token);
    error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, ap->a_cred);
    if (error != ENOIOCTL) {
        lwkt_reltoken(&tp->t_token);
        lwkt_reltoken(&vga_token);

        return(error);
    }

    error = ttioctl(tp, cmd, data, flag);
    if (error != ENOIOCTL) {
        lwkt_reltoken(&tp->t_token);
        lwkt_reltoken(&vga_token);

        return(error);
    }

    lwkt_reltoken(&tp->t_token);
    lwkt_reltoken(&vga_token);

    return(ENOTTY);
}

static void
scstart(struct tty *tp)
{
    struct clist *rbp;
    int len;
    u_char buf[PCBURST];
    scr_stat *scp = SC_STAT(tp->t_dev);

    syscons_lock();
    if (scp->status & SLKED ||
        (scp == scp->sc->cur_scp && scp->sc->blink_in_progress))
    {
        syscons_unlock();
        return;
    }
    if (!(tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP))) {
        tp->t_state |= TS_BUSY;
        rbp = &tp->t_outq;
        while (rbp->c_cc) {
            len = clist_qtob(rbp, buf, PCBURST);
            sc_puts(scp, buf, len);
        }
        tp->t_state &= ~TS_BUSY;
        syscons_unlock();
        ttwwakeup(tp);
    } else {
        syscons_unlock();
    }
}

static void
sccnprobe(struct consdev *cp)
{
    int unit;
    int flags;

    cp->cn_pri = sc_get_cons_priority(&unit, &flags);

    /* a video card is always required */
    if (probe_efi_fb(1) != 0 && !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 */
    cp->cn_probegood = 1;
}

static void
sccninit(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_softc(unit, SC_KERNEL_CONSOLE)->console_scp;
}

static void
sccninit_fini(struct consdev *cp)
{
        if (cctl_dev == NULL)
                kprintf("sccninit_fini: WARNING: cctl_dev is NULL!\n");
        cp->cn_dev = cctl_dev;
}

/*
 * This is called when the console is switched away from syscons to
 * a late-configuring device (such as a PCIe serial port).  Since
 * late-configuring devices basically didn't exist until now, this
 * routine was never called, and SURPRISE!  It doesn't work... causes
 * syscons to implode due to all the funny console-not-console structure
 * selection syscons does.
 *
 * Make it a NOP.  Just leave the console designation intact, even
 * though it is no longer a console.
 */
static void
sccnterm(struct consdev *cp)
{
#if 0
    /* we are not the kernel console any more, release everything */

    if (sc_console_unit < 0)
        return;                 /* shouldn't happen */

#if 0 /* XXX */
    syscons_lock();
    sc_clear_screen(sc_console);
    sccnupdate(sc_console);
    syscons_unlock();
#endif
    scterm(sc_console_unit, SC_KERNEL_CONSOLE);
    sc_console_unit = -1;
    sc_console = NULL;
#endif
}

/*
 * Console path - cannot block!
 */
static void
sccnputc(void *private, int c)
{
    u_char buf[1];
    scr_stat *scp = sc_console;
    void *save;
#ifndef SC_NO_HISTORY
#if 0
    struct tty *tp;
#endif
#endif /* !SC_NO_HISTORY */

    /* assert(sc_console != NULL) */

    if (syscons_lock_nonblock() != 0)
        return;
#ifndef SC_NO_HISTORY
    if (scp == scp->sc->cur_scp && scp->status & SLKED) {
        scp->status &= ~SLKED;
#if 0
        /* This can block, illegal in the console path */
        update_kbd_state(scp, scp->status, SLKED, TRUE);
#endif
        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
        tp = VIRTUAL_TTY(scp->sc, scp->index);
        /* This can block, illegal in the console path */
        if (ISTTYOPEN(tp)) {
            scstart(tp);
        }
#endif
    }
#endif /* !SC_NO_HISTORY */

    save = scp->ts;
    if (kernel_console_ts != NULL)
        scp->ts = kernel_console_ts;
    buf[0] = c;
    sc_puts(scp, buf, 1);
    scp->ts = save;

    sccnupdate(scp);
    syscons_unlock();
}

/*
 * Console path - cannot block!
 */
static int
sccngetc(void *private)
{
    return sccngetch(0);
}

/*
 * Console path - cannot block!
 */
static int
sccncheckc(void *private)
{
    return sccngetch(SCGETC_NONBLOCK);
}

/*
 * Set polling mode (also disables the tty feed), use when
 * polling for console key input.
 */
static void
sccnpoll(void *private, int on)
{
    scr_stat *scp;

    syscons_lock();
    sc_touch_scrn_saver();
    scp = sc_console->sc->cur_scp;      /* XXX */
    syscons_unlock();
    if (scp->sc->kbd)
            kbd_poll(scp->sc->kbd, on);
}

static void
sccndbctl(void *private, int on)
{
    /* assert(sc_console_unit >= 0) */
    /* try to switch to the kernel console screen */
    if (on && debugger == 0) {
        /*
         * TRY to make sure the screen saver is stopped, 
         * and the screen is updated before switching to 
         * the vty0.
         */
        scrn_timer(NULL);
        if (!cold
            && sc_console->sc->cur_scp->smode.mode == VT_AUTO
            && sc_console->smode.mode == VT_AUTO) {
            sc_console->sc->cur_scp->status |= MOUSE_HIDDEN;
            syscons_lock();
            sc_switch_scr(sc_console->sc, sc_console->index);
            syscons_unlock();
        }
    }
    if (on)
        ++debugger;
    else
        --debugger;
}

/*
 * Console path - cannot block!
 */
static int
sccngetch(int flags)
{
    static struct fkeytab fkey;
    static int fkeycp;
    scr_stat *scp;
    u_char *p;
    int cur_mode;
    int c;

    syscons_lock();
    /* 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);
    syscons_unlock();

    if (fkeycp < fkey.len) {
        return fkey.str[fkeycp++];
    }

    if (scp->sc->kbd == NULL) {
        return -1;
    }

    /* 
     * Make sure the keyboard is accessible even when the kbd device
     * driver is disabled.
     */
    crit_enter();
    kbd_enable(scp->sc->kbd);

    /* we shall always use the keyboard in the XLATE mode here */
    cur_mode = scp->kbd_mode;
    scp->kbd_mode = K_XLATE;
    kbd_ioctl(scp->sc->kbd, KDSKBMODE, (caddr_t)&scp->kbd_mode);

    c = scgetc(scp->sc, SCGETC_CN | flags);

    scp->kbd_mode = cur_mode;
    kbd_ioctl(scp->sc->kbd, KDSKBMODE, (caddr_t)&scp->kbd_mode);
    kbd_disable(scp->sc->kbd);
    crit_exit();

    switch (KEYFLAGS(c)) {
    case 0:     /* normal char */
        return KEYCHAR(c);
    case FKEY:  /* function key */
        p = kbd_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:
        if (flags & SCGETC_NONBLOCK)
                return c;
        /* fall through */
    case ERRKEY:
    default:
        return -1;
    }
    /* NOT REACHED */
}

static void
sccnupdate(scr_stat *scp)
{
    int ddb_active;

#ifdef DDB
    ddb_active = db_active;
#else
    ddb_active = 0;
#endif

    /* this is a cut-down version of scrn_timer()... */

    /*
     * Don't update if videoio is in progress.  However, if we are paniced
     * or in the debugger it is possible that the variables might be stuck,
     * so ignore it in such cases.
     */
    if (scp->sc->font_loading_in_progress || scp->sc->videoio_in_progress) {
        if (panicstr == NULL && ddb_active == 0 && shutdown_in_progress == 0)
                return;
    }

    if (debugger > 0 || panicstr || ddb_active || 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;
#if NSPLASH > 0
    /*
     * This is a hard path, we cannot call stop_scrn_saver() here.
     */
    if ((saver_mode != CONS_LKM_SAVER) || !(scp->sc->flags & SC_SCRN_IDLE))
        if (scp->sc->flags & SC_SCRN_BLANKED) {
            sc_touch_scrn_saver();
            /*stop_scrn_saver(scp->sc, current_saver);*/
        }
#endif /* NSPLASH */

    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, SCRN_ASYNCOK);
}

static void
scrn_timer(void *arg)
{
    static int kbd_interval = 0;
    struct timeval tv;
    sc_softc_t *sc;
    scr_stat *scp;
    int again;

    /*
     * Setup depending on who called us
     */
    again = (arg != NULL);
    if (arg != NULL) {
        sc = (sc_softc_t *)arg;
    } else if (sc_console != NULL) {
        sc = sc_console->sc;
    } else {
        return;
    }

    /*
     * Don't do anything when we are performing some I/O operations.
     * (These are initiated by the frontend?)
     */
    if (sc->font_loading_in_progress || sc->videoio_in_progress) {
        if (again)
            callout_reset(&sc->scrn_timer_ch, hz / 10, scrn_timer, sc);
        return;
    }

    /*
     * Try to allocate a keyboard automatically
     */
    if ((sc->kbd == NULL) && (sc->config & SC_AUTODETECT_KBD)) {
        if (++kbd_interval >= 25) {
            sc->keyboard = sc_allocate_keyboard(sc, -1);
            if (sc->keyboard >= 0) {
                sc->kbd = kbd_get_keyboard(sc->keyboard);
                kbd_ioctl(sc->kbd, KDSKBMODE,
                          (caddr_t)&sc->cur_scp->kbd_mode);
                update_kbd_state(sc->cur_scp, sc->cur_scp->status,
                    LOCK_MASK, FALSE);
            }
            kbd_interval = 0;
        }
    }

    /*
     * Should we stop the screen saver?  We need the syscons_lock
     * for most of this stuff.
     */
    getmicrouptime(&tv);

    if (syscons_lock_nonblock() != 0) {
        /* failed to get the lock */
        if (again)
            callout_reset(&sc->scrn_timer_ch, hz / 10, scrn_timer, sc);
        return;
    }
    /* successful lock */

    if (debugger > 0 || panicstr || shutdown_in_progress)
        sc_touch_scrn_saver();
    if (run_scrn_saver) {
        if (tv.tv_sec > sc->scrn_time_stamp + scrn_blank_time)
            sc->flags |= SC_SCRN_IDLE;
        else
            sc->flags &= ~SC_SCRN_IDLE;
    } else {
        sc->scrn_time_stamp = tv.tv_sec;
        sc->flags &= ~SC_SCRN_IDLE;
        if (scrn_blank_time > 0)
            run_scrn_saver = TRUE;
    }
#if NSPLASH > 0
    if ((saver_mode != CONS_LKM_SAVER) || !(sc->flags & SC_SCRN_IDLE)) {
        if ((sc->flags & SC_SCRN_BLANKED) && !ISGRAPHSC(sc->cur_scp))
            stop_scrn_saver(sc, current_saver);
    }
#endif /* NSPLASH */

    /* should we just return ? */
    if (sc->blink_in_progress || sc->switch_in_progress ||
        sc->write_in_progress)
    {
        syscons_unlock();
        if (again)
            callout_reset(&sc->scrn_timer_ch, hz / 10, scrn_timer, sc);
        return;
    }

    /* Update the screen */
    scp = sc->cur_scp;          /* cur_scp may have changed... */
    if (!ISGRAPHSC(scp) && !(sc->flags & SC_SCRN_BLANKED))
        scrn_update(scp, TRUE, SCRN_ASYNCOK);

#if NSPLASH > 0
    /* 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 /* NSPLASH */

    syscons_unlock();
    if (again)
        callout_reset(&sc->scrn_timer_ch, hz / 25, scrn_timer, sc);
}

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;
}

/*
 * Refresh modified frame buffer range.  Also used to
 * scroll (entire FB is marked modified).
 *
 * This function is allowed to run without the syscons_lock,
 * so scp fields can change unexpected.  We cache most values
 * that we care about and silently discard illegal ranges.
 */
static void 
scrn_update(scr_stat *scp, int show_cursor, int flags)
{
    int start;
    int end;
    int cpos;
    int copos;
    int s;
    int e;
    int ddb_active;

#ifdef DDB
    ddb_active = db_active;
#else
    ddb_active = 0;
#endif

    /*
     * Try to run large screen updates as an async operation, which will
     * call this function again from a thread with BULKUNLOCK set, allowing
     * interrupts during the update which tends to make the system behave
     * better (no sound glitches, etc).
     */
    if ((flags & SCRN_ASYNCOK) && syscons_async && scp->asynctd &&
        (scp->end - scp->start) > 16 &&
        panicstr == NULL && ddb_active == 0 && shutdown_in_progress == 0) {
        scp->show_cursor = show_cursor;
        scp->queue_update_td = 1;
        wakeup(&scp->asynctd);
        return;
    }
    if (flags & SCRN_BULKUNLOCK)
        syscons_lock();

    /*
     * Synchronous operation or called from
     */

    /* assert(scp == scp->sc->cur_scp) */
    atomic_add_int(&scp->sc->videoio_in_progress, 1);

    cpos = scp->cursor_pos;
    copos = scp->cursor_oldpos;

#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) && 
                (cpos != copos) &&
                (and_region(&s, &e, cpos, cpos)
                 || and_region(&s, &e, copos, copos)))) {
            sc_remove_mouse_image(scp);
            if (scp->end >= scp->xsize*scp->ysize)
                scp->end = scp->xsize*scp->ysize - 1;
        }
    }
#endif /* !SC_NO_CUTPASTE */

    /*
     * WARNING: Don't add debugging kprintf()s with syscons locked.
     *          Or at all.
     */
    if (scp->end >= scp->xsize*scp->ysize) {
        scp->end = scp->xsize*scp->ysize - 1;
    }
    if (scp->start < 0) {
        scp->start = 0;
    }

    /*
     * Main update, extract update range and reset
     * ASAP.
     */
    start = scp->start;
    end = scp->end;
    scp->end = 0;
    scp->start = scp->xsize * scp->ysize - 1;

    if (start <= end)  {
        if (flags & SCRN_BULKUNLOCK) {
            atomic_add_int(&scp->sc->videoio_in_progress, -1);
            syscons_unlock();
        }
        (*scp->rndr->draw)(scp, start, end - start + 1, FALSE);
        if (flags & SCRN_BULKUNLOCK) {
            syscons_lock();
            atomic_add_int(&scp->sc->videoio_in_progress, 1);
        }

        /*
         * Handle cut sequence
         */
        s = scp->mouse_cut_start;
        e = scp->mouse_cut_end;
        cpu_ccfence();          /* allowed to race */

        if (e >= 0) {
            if (s > e) {
                int r = s;
                s = e;
                e = r;
            }
            /* does the cut-mark region overlap with the update region? */
            if (and_region(&s, &e, start, end)) {
                if (flags & SCRN_BULKUNLOCK) {
                    atomic_add_int(&scp->sc->videoio_in_progress, -1);
                    syscons_unlock();
                }
                (*scp->rndr->draw)(scp, s, e - s + 1, TRUE);
                if (flags & SCRN_BULKUNLOCK) {
                    syscons_lock();
                    atomic_add_int(&scp->sc->videoio_in_progress, 1);
                }
            }
        }
    }

    /* we are not to show the cursor and the mouse pointer... */
    if (!show_cursor)
        goto cleanup;

    /* update cursor image */
    if (scp->status & CURSOR_ENABLED) {
        s = start;
        e = end;
        /* did cursor move since last time ? */
        if (cpos != copos) {
            /* do we need to remove old cursor image ? */
            if (!and_region(&s, &e, copos, copos))
                sc_remove_cursor_image(scp);
            sc_draw_cursor_image(scp);
        } else {
            if (s <= e && and_region(&s, &e, cpos, cpos)) {
                /* cursor didn't move, but has been overwritten */
                sc_draw_cursor_image(scp);
            } else if (scp->sc->flags & SC_BLINK_CURSOR) {
                /* if it's a blinking cursor, update it */
                (*scp->rndr->blink_cursor)(scp, cpos,
                                           sc_inside_cutmark(scp, cpos));
            }
        }
    }

#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 */

    /*
     * Cleanup
     */
cleanup:
    atomic_add_int(&scp->sc->videoio_in_progress, -1);
    if (flags & SCRN_BULKUNLOCK)
        syscons_unlock();
}

/*
 * Thread handles potentially expensive screen updates.   The function is
 * expected to operate safely without locks.
 */
static void
scrn_update_thread(void *arg)
{
        scr_stat *scp = arg;
        for (;;) {
                if (scp->queue_update_td == 0) {
                        tsleep_interlock(&scp->asynctd, 0);
                        if (scp->queue_update_td == 0)
                                tsleep(&scp->asynctd, PINTERLOCKED, "wait", 0);
                }
                scp->queue_update_td = 0;
                lockmgr(&sc_asynctd_lk, LK_EXCLUSIVE);
                atomic_add_int(&scp->sc->videoio_in_progress, 1);
                scrn_update(scp, scp->show_cursor, SCRN_BULKUNLOCK);
                atomic_add_int(&scp->sc->videoio_in_progress, -1);
                lockmgr(&sc_asynctd_lk, LK_RELEASE);
        }
}

static void
sc_fb_set_par(void *context, int pending)
{
        sc_softc_t *sc = context;

        lwkt_gettoken(&vga_token);
        if (sc->fbi != NULL && sc->fbi->fbops.fb_set_par != NULL)
            sc->fbi->fbops.fb_set_par(sc->fbi);
        lwkt_reltoken(&vga_token);
}

#if NSPLASH > 0
static void
sc_fb_blank(void *context, int pending)
{
        sc_softc_t *sc = context;

        lwkt_gettoken(&vga_token);
        if (sc->fbi != NULL && sc->fbi->fbops.fb_blank != NULL) {
                /* 0 == FB_BLANK_UNBLANK and 4 == FB_BLANK_POWERDOWN */
                if (sc->flags & SC_SCRN_BLANKED) {
                        sc->fbi->fbops.fb_blank(4, sc->fbi);
                        sc->fb_blanked = TRUE;
                        if (sc->unit == sc_console_unit)
                                cons_unavail = TRUE;
                } else {
                        sc->fbi->fbops.fb_blank(0, sc->fbi);
                        sc->fb_blanked = FALSE;
                        if (sc->unit == sc_console_unit &&
                            sc->cur_scp->smode.mode == VT_AUTO)
                                cons_unavail = FALSE;
                }
        }
        lwkt_reltoken(&vga_token);
}

static void
scframebuffer_saver(sc_softc_t *sc, int show)
{
        scr_stat *scp = sc->cur_scp;

        if (panicstr)
                return;

        /*
         * Gets called on every screen update while screensaver is active,
         * so we need to check the SC_SCRN_BLANKED flag ourselves.
         */
        if ((sc->flags & SC_SCRN_BLANKED) && show)
                return;

        taskqueue_cancel(taskqueue_thread[0], sc->fb_blank_task, NULL);
        crit_enter();
        if (show) {
                scp->status |= SAVER_RUNNING;
                sc->flags |= SC_SCRN_BLANKED;
                ++scrn_blanked;
        } else {
                scp->status &= ~SAVER_RUNNING;
                sc->flags &= ~SC_SCRN_BLANKED;
                --scrn_blanked;
        }
        crit_exit();
        taskqueue_enqueue(taskqueue_thread[0], sc->fb_blank_task);
}

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) {
                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);
                kprintf("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, FALSE);
    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)
{

    /* assert(scp == scp->sc->cur_scp) */
    crit_enter();
    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;
    crit_exit();
    if (mode < 0) {
        return 0;
    }
    scp->mode = mode;
    if (set_mode(scp) == 0) {
        if (scp->sc->fbi == NULL &&
            scp->sc->adp->va_info.vi_flags & V_INFO_GRAPHICS) {
            scp->status |= GRAPHICS_MODE;
        }
        if (scp->sc->fbi == NULL && pal != NULL)
            load_palette(scp->sc->adp, pal);
        sc_set_border(scp, border);
        return 0;
    } else {
        crit_enter();
        scp->mode = scp->splash_save_mode;
        scp->status &= ~(UNKNOWN_MODE | SAVER_RUNNING);
        scp->status |= scp->splash_save_status;
        crit_exit();
        return 1;
    }
    /* NOTREACHED */
}

static int
restore_scrn_saver_mode(scr_stat *scp, int changemode)
{
    int mode;
    int status;

    /* assert(scp == scp->sc->cur_scp) */
    crit_enter();
    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;
        crit_exit();
        return 0;
    }
    if (set_mode(scp) == 0) {
        if (scp->sc->fbi == NULL)
            load_palette(scp->sc->adp, scp->sc->palette);
        --scrn_blanked;
        crit_exit();
        return 0;
    } else {
        scp->mode = mode;
        scp->status = status;
        crit_exit();
        return 1;
    }
    /* NOTREACHED */
}

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);
    wakeup(&scrn_blanked);
}

static int
wait_scrn_saver_stop(sc_softc_t *sc, int need_unlock)
{
    int error = 0;

    while (scrn_blanked > 0) {
        run_scrn_saver = FALSE;
        if (sc && !(sc->flags & SC_SCRN_BLANKED)) {
            error = 0;
            break;
        }
        if (need_unlock) {
            tsleep_interlock(&scrn_blanked, PCATCH);
            syscons_unlock();
            error = tsleep(&scrn_blanked, PCATCH | PINTERLOCKED, "scrsav", 0);
            syscons_lock();
        } else {
            error = tsleep(&scrn_blanked, PCATCH, "scrsav", 0);
        }
        /* May return ERESTART */
        if (error)
                break;
    }
    run_scrn_saver = FALSE;
    return error;
}
#endif /* NSPLASH */

void
sc_start_scrn_saver(sc_softc_t *sc)
{
#if NSPLASH > 0
    (*current_saver)(sc, TRUE);
#endif
}

void
sc_stop_scrn_saver(sc_softc_t *sc)
{
#if NSPLASH > 0
    if (sc->flags & SC_SCRN_BLANKED)
        stop_scrn_saver(sc, current_saver);
#endif
}

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;

    DPRINTF(5, ("sc0: sc_switch_scr() %d ", next_scr + 1));

    /* 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->videoio_in_progress) {
        sc->delayed_next_scr = next_scr + 1;
        sc_touch_scrn_saver();
        DPRINTF(5, ("switch delayed\n"));
        return 0;
    }

    cur_scp = sc->cur_scp;

    /*
     * we are in the middle of the vty switching process...
     *
     * This may be in the console path, be very careful.  pfindn() is
     * still going to use a spinlock but it no longer uses tokens so
     * we should be ok.
     */
    if (sc->switch_in_progress &&
        (cur_scp->smode.mode == VT_PROCESS) &&
        cur_scp->proc) {
        if (cur_scp->proc != pfindn(cur_scp->pid)) {
            /* 
             * 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);
                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 {
            /*
             * 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);
                    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) {
        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 = VIRTUAL_TTY(sc, cur_scp->index);
    if ((cur_scp->index != next_scr)
        && ISTTYOPEN(tp)
        && (cur_scp->smode.mode == VT_AUTO)
        && ISGRAPHSC(cur_scp)) {
        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 = VIRTUAL_TTY(sc, next_scr);
        if (!ISTTYOPEN(tp)) {
            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->t_dev)->smode.mode == VT_PROCESS)) {
            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->delayed_next_scr = 0;
    sc->old_scp = cur_scp;
    sc->new_scp = SC_STAT(SC_DEV(sc, next_scr));
    if (sc->new_scp == sc->old_scp) {
        sc->switch_in_progress = 0;
        wakeup((caddr_t)&sc->new_scp->smode);
        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)) {
        return 0;
    }

    /* go set up the new vty screen */
    exchange_scr(sc);

    /* wake up processes waiting for this vty */
    wakeup((caddr_t)&sc->cur_scp->smode);

    /* wait for the controlling process to acknowledge, if necessary */
    if (signal_vt_acq(sc->cur_scp)) {
        return 0;
    }

    sc->switch_in_progress = 0;
    if (sc->unit == sc_console_unit && !sc->fb_blanked)
        cons_unavail = FALSE;
    DPRINTF(5, ("switch done\n"));

    return 0;
}

static void
do_switch_scr(sc_softc_t *sc)
{
    lwkt_gettoken(&vga_token);
    vt_proc_alive(sc->new_scp);

    exchange_scr(sc);
    /* sc->cur_scp == sc->new_scp */
    wakeup((caddr_t)&sc->cur_scp->smode);

    /* 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 && !sc->fb_blanked)
            cons_unavail = FALSE;
    }
    lwkt_reltoken(&vga_token);
}

static int
vt_proc_alive(scr_stat *scp)
{
    lwkt_gettoken(&vga_token);
    if (scp->proc) {
        if (scp->proc == pfindn(scp->pid)) {
            lwkt_reltoken(&vga_token);
            return TRUE;
        }
        scp->proc = NULL;
        scp->smode.mode = VT_AUTO;
        DPRINTF(5, ("vt controlling process %d died\n", scp->pid));
    }
    lwkt_reltoken(&vga_token);
    return FALSE;
}

static int
signal_vt_rel(scr_stat *scp)
{
    struct proc *p;

    lwkt_gettoken(&vga_token);
    if (scp->smode.mode != VT_PROCESS) {
        lwkt_reltoken(&vga_token);
        return FALSE;
    }
    scp->status |= SWITCH_WAIT_REL;
    p = scp->proc;
    PHOLD(p);
    ksignal(p, scp->smode.relsig);
    PRELE(p);
    DPRINTF(5, ("sending relsig to %d\n", scp->pid));
    lwkt_reltoken(&vga_token);

    return TRUE;
}

static int
signal_vt_acq(scr_stat *scp)
{
    struct proc *p;

    lwkt_gettoken(&vga_token);
    if (scp->smode.mode != VT_PROCESS) {
        lwkt_reltoken(&vga_token);
        return FALSE;
    }
    if (scp->sc->unit == sc_console_unit)
        cons_unavail = TRUE;
    scp->status |= SWITCH_WAIT_ACQ;
    p = scp->proc;
    PHOLD(p);
    ksignal(p, scp->smode.acqsig);
    PRELE(p);
    DPRINTF(5, ("sending acqsig to %d\n", scp->pid));
    lwkt_reltoken(&vga_token);

    return TRUE;
}

static int
finish_vt_rel(scr_stat *scp, int release)
{
    lwkt_gettoken(&vga_token);
    if (scp == scp->sc->old_scp && scp->status & SWITCH_WAIT_REL) {
        scp->status &= ~SWITCH_WAIT_REL;
        if (release)
            do_switch_scr(scp->sc);
        else
            scp->sc->switch_in_progress = 0;
        lwkt_reltoken(&vga_token);
        return 0;
    }
    lwkt_reltoken(&vga_token);
    return EINVAL;
}

static int
finish_vt_acq(scr_stat *scp)
{
    lwkt_gettoken(&vga_token);
    if (scp == scp->sc->new_scp && scp->status & SWITCH_WAIT_ACQ) {
        scp->status &= ~SWITCH_WAIT_ACQ;
        scp->sc->switch_in_progress = 0;
        lwkt_reltoken(&vga_token);
        return 0;
    }
    lwkt_reltoken(&vga_token);
    return EINVAL;
}

static void
exchange_scr(sc_softc_t *sc)
{
    scr_stat *scp;

    lwkt_gettoken(&vga_token);
    /* 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, TRUE);

    /* set up the video for the new screen */
    scp = sc->cur_scp = sc->new_scp;
    if (sc->old_scp->mode != scp->mode || ISUNKNOWNSC(sc->old_scp))
        set_mode(scp);
    else if (sc->adp != NULL)
        sc_vtb_init(&scp->scr, VTB_FRAMEBUFFER, scp->xsize, scp->ysize,
                    (void *)sc->adp->va_window, FALSE);
    scp->status |= MOUSE_HIDDEN;
    sc_update_render(scp);     /* Switch to kms renderer if necessary */
    sc_move_cursor(scp, scp->xpos, scp->ypos);
    if (!ISGRAPHSC(scp))
        sc_set_cursor_image(scp);
    if (sc->fbi == NULL && ISGRAPHSC(sc->old_scp))
        load_palette(sc->adp, sc->palette);
    if (!ISGRAPHSC(scp) || sc->fbi == NULL)
        sc_set_border(scp, scp->border);

    /* set up the keyboard for the new screen */
    if (sc->old_scp->kbd_mode != scp->kbd_mode)
        kbd_ioctl(sc->kbd, KDSKBMODE, (caddr_t)&scp->kbd_mode);
    update_kbd_state(scp, scp->status, LOCK_MASK, TRUE);

    mark_all(scp);

    /*
     * Restore DRM framebuffer console mode if necessary.
     * Especially avoid modesetting when switching to a vt which is in
     * graphics mode, because the fb_set_par() from the taskqueue thread
     * might race with the modesetting ioctl from the userland application.
     */
    if (!ISTEXTSC(sc->old_scp) &&
        sc->fbi != NULL && sc->fbi->fbops.fb_set_par != NULL &&
        sc->fb_set_par_task != NULL) {
        taskqueue_enqueue(taskqueue_thread[0], sc->fb_set_par_task);
    }

    lwkt_reltoken(&vga_token);
}

static void
sc_puts(scr_stat *scp, u_char *buf, int len)
{
#if NSPLASH > 0
    /* make screensaver happy */
    if (!sticky_splash && scp == scp->sc->cur_scp)
        run_scrn_saver = FALSE;
#endif

    if (scp->tsw)
        (*scp->tsw->te_puts)(scp, buf, len);

    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); */
    atomic_add_int(&scp->sc->videoio_in_progress, 1);
    (*scp->rndr->draw_cursor)(scp, scp->cursor_pos,
                              scp->sc->flags & SC_BLINK_CURSOR, TRUE,
                              sc_inside_cutmark(scp, scp->cursor_pos));
    scp->cursor_oldpos = scp->cursor_pos;
    atomic_add_int(&scp->sc->videoio_in_progress, -1);
}

void
sc_remove_cursor_image(scr_stat *scp)
{
    /* assert(scp == scp->sc->cur_scp); */
    atomic_add_int(&scp->sc->videoio_in_progress, 1);
    (*scp->rndr->draw_cursor)(scp, scp->cursor_oldpos,
                              scp->sc->flags & SC_BLINK_CURSOR, FALSE,
                              sc_inside_cutmark(scp, scp->cursor_oldpos));
    atomic_add_int(&scp->sc->videoio_in_progress, -1);
}

static void
update_cursor_image(scr_stat *scp)
{
    int blink;

    if (scp->sc->flags & SC_CHAR_CURSOR) {
        scp->cursor_base = imax(0, scp->sc->cursor_base);
        scp->cursor_height = imin(scp->sc->cursor_height, scp->font_height);
    } else {
        scp->cursor_base = 0;
        scp->cursor_height = scp->font_height;
    }
    blink = scp->sc->flags & SC_BLINK_CURSOR;

    /* assert(scp == scp->sc->cur_scp); */
    atomic_add_int(&scp->sc->videoio_in_progress, 1);
    (*scp->rndr->draw_cursor)(scp, scp->cursor_oldpos, blink, FALSE, 
                              sc_inside_cutmark(scp, scp->cursor_pos));
    (*scp->rndr->set_cursor)(scp, scp->cursor_base, scp->cursor_height, blink);
    (*scp->rndr->draw_cursor)(scp, scp->cursor_pos, blink, TRUE, 
                              sc_inside_cutmark(scp, scp->cursor_pos));
    atomic_add_int(&scp->sc->videoio_in_progress, -1);
}

void
sc_set_cursor_image(scr_stat *scp)
{
    if (scp->sc->flags & SC_CHAR_CURSOR) {
        scp->cursor_base = imax(0, scp->sc->cursor_base);
        scp->cursor_height = imin(scp->sc->cursor_height, scp->font_height);
    } else {
        scp->cursor_base = 0;
        scp->cursor_height = scp->font_height;
    }

    /* assert(scp == scp->sc->cur_scp); */
    atomic_add_int(&scp->sc->videoio_in_progress, 1);
    (*scp->rndr->set_cursor)(scp, scp->cursor_base, scp->cursor_height,
                             scp->sc->flags & SC_BLINK_CURSOR);
    atomic_add_int(&scp->sc->videoio_in_progress, -1);
}

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
     */
    static scr_stat main_console;
    static u_short sc_buffer[2*ROW*2*COL];      /* XXX */
#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;
    char tbuf[MAKEDEV_MINNBUF];
    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);
    adp = NULL;
    if (flags & SC_EFI_FB) {
        /* Don't replace already registered drm framebuffer here */
        if (sc->fbi == NULL) {
            sc->fbi = &efi_fb_info;
            sc->fbi_generation++;
        }
    } else 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;
    }
    if (!(flags & SC_EFI_FB)) {
        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)) {

        if (sc->fbi != NULL)
                sc->initial_mode = 0;
        else
                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 = kmalloc(sizeof(font_8), M_SYSCONS, M_WAITOK);
            sc->font_14 = kmalloc(sizeof(font_14), M_SYSCONS, M_WAITOK);
            sc->font_16 = kmalloc(sizeof(font_16), M_SYSCONS, M_WAITOK);
        }
#endif

        if (sc->fbi != NULL) {
            col = 0;
            row = 0;
        } else {
            lwkt_gettoken(&vga_token);
            /* extract the hw cursor location and hide the cursor for now */
            (*vidsw[sc->adapter]->read_hw_cursor)(sc->adp, &col, &row);
            (*vidsw[sc->adapter]->set_hw_cursor)(sc->adp, -1, -1);
            lwkt_reltoken(&vga_token);
        }

        /* set up the first console */
        sc->first_vty = unit*MAXCONS;
        sc->vtys = MAXCONS;             /* XXX: should be configurable */
        if (flags & SC_KERNEL_CONSOLE) {
            scp = &main_console;
            sc->console_scp = scp;
            init_scp(sc, sc->first_vty, scp);
            sc_vtb_init(&scp->vtb, VTB_MEMORY, scp->xsize, scp->ysize,
                        (void *)sc_buffer, FALSE);
            if (sc_init_emulator(scp, SC_DFLT_TERM))
                sc_init_emulator(scp, "*");
            (*scp->tsw->te_default_attr)(scp,
                                         kernel_default.std_color,
                                         kernel_default.rev_color);
        } else {
            /* assert(sc_malloc) */
            sc->dev = kmalloc(sizeof(cdev_t)*sc->vtys, M_SYSCONS, M_WAITOK | M_ZERO);

            sc->dev[0] = make_dev(&sc_ops, unit*MAXCONS, UID_ROOT,
                                  GID_WHEEL, 0600, "ttyv%s",
                                  makedev_unit_b32(tbuf, unit * MAXCONS));

            ttymalloc(&sc->dev[0]->si_tty);
            scp = alloc_scp(sc, sc->first_vty);
            sc->dev[0]->si_drv1 = scp;
        }
        sc->cur_scp = scp;

        /* copy screen to temporary buffer */
        if (scp->sc->fbi == NULL) {
            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);
        }

        /* 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;
        if (sc->fbi != NULL) {
            scp->cursor_pos = 0;
            sc->cursor_base = 0;
            sc->cursor_height = scp->font_height;
        } else {
            scp->cursor_pos = scp->cursor_oldpos = row*scp->xsize + col;
            if (bios_value.cursor_end < scp->font_height)
                sc->cursor_base = scp->font_height - bios_value.cursor_end - 1;
            else
                sc->cursor_base = 0;
            i = bios_value.cursor_end - bios_value.cursor_start + 1;
            sc->cursor_height = imin(i, scp->font_height);
        }
#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);
            /* If framebuffer vaddr is still 0, we can't draw the border yet */
            if (scp->sc->fbi != NULL && scp->sc->fbi->vaddr != 0) {
                sc_filled_border = TRUE;
                sc_set_border(scp, scp->border);
            }
        }

        /* save font and palette */
#ifndef SC_NO_FONT_LOADING
        sc->fonts_loaded = 0;
#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;
#endif /* SC_DFLT_FONT */
        if (sc->adp != NULL && ISFONTAVAIL(sc->adp->va_flags)) {
#ifdef SC_DFLT_FONT
            if (scp->font_height < 14) {
                sc_load_font(scp, 0, 8, sc->font_8, 0, 256);
            } else if (scp->font_height >= 16) {
                sc_load_font(scp, 0, 16, sc->font_16, 0, 256);
            } else {
                sc_load_font(scp, 0, 14, sc->font_14, 0, 256);
            }
#else /* !SC_DFLT_FONT */
            if (scp->font_height < 14) {
                sc_save_font(scp, 0, 8, sc->font_8, 0, 256);
                sc->fonts_loaded = FONT_8;
            } else if (scp->font_height >= 16) {
                sc_save_font(scp, 0, 16, sc->font_16, 0, 256);
                sc->fonts_loaded = FONT_16;
            } else {
                sc_save_font(scp, 0, 14, 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 */

        if (!(flags & SC_EFI_FB))
            save_palette(sc->adp, sc->palette);

#if NSPLASH > 0
        if (!(sc->flags & SC_SPLASH_SCRN) && (flags & SC_KERNEL_CONSOLE)) {
            /* we are ready to put up the splash image! */
            splash_init(sc->adp, scsplash_callback, sc);
            sc->flags |= SC_SPLASH_SCRN;
        }
#endif /* NSPLASH */
    }

    /* 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;

    sc->flags |= SC_INIT_DONE;
}

#if 0
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 */

    lwkt_gettoken(&vga_token);
#if NSPLASH > 0
    /* 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 /* NSPLASH */

#if 0 /* XXX */
    /* move the hardware cursor to the upper-left corner */
    (*vidsw[sc->adapter]->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.  If operating on the
     * kernel console sc->dev may not be setup yet.
     */
    if (flags & SC_KERNEL_CONSOLE)
        scp = sc->console_scp;
    else
        scp = SC_STAT(sc->dev[0]);
    if (scp->tsw)
        (*scp->tsw->te_term)(scp, &scp->ts);
    if (scp->ts != NULL)
        kfree(scp->ts, M_SYSCONS);

    /* clear the structure */
    if (!(flags & SC_KERNEL_CONSOLE)) {
        /* XXX: We need delete_dev() for this */
        kfree(sc->dev, M_SYSCONS);
#if 0
        /* XXX: We need a ttyunregister for this */
        /* XXX: do not race tty token access */
        kfree(sc->tty, M_SYSCONS);
#endif
#ifndef SC_NO_FONT_LOADING
        kfree(sc->font_8, M_SYSCONS);
        kfree(sc->font_14, M_SYSCONS);
        kfree(sc->font_16, M_SYSCONS);
#endif
        /* XXX vtb, history */
    }
    bzero(sc, sizeof(*sc));
    sc->keyboard = -1;
    sc->adapter = -1;
    lwkt_reltoken(&vga_token);
}
#endif

static void
scshutdown(void *arg, int howto)
{
    /* assert(sc_console != NULL) */

    lwkt_gettoken(&vga_token);
    syscons_lock();
    sc_touch_scrn_saver();
    if (!cold && sc_console
        && 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;
    syscons_unlock();
    lwkt_reltoken(&vga_token);
}

int
sc_clean_up(scr_stat *scp, int need_unlock)
{
#if NSPLASH > 0
    int error;
#endif /* NSPLASH */

    lwkt_gettoken(&vga_token);
    if (scp->sc->flags & SC_SCRN_BLANKED) {
        sc_touch_scrn_saver();
#if NSPLASH > 0
        if ((error = wait_scrn_saver_stop(scp->sc, need_unlock))) {
            lwkt_reltoken(&vga_token);
            return error;
        }
#endif /* NSPLASH */
    }
    scp->status |= MOUSE_HIDDEN;
    sc_remove_mouse_image(scp);
    sc_remove_cutmarking(scp);
    lwkt_reltoken(&vga_token);
    return 0;
}

void
sc_alloc_scr_buffer(scr_stat *scp, int wait, int discard)
{
    sc_vtb_t new;
    sc_vtb_t old;

    lwkt_gettoken(&vga_token);
    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
    lwkt_reltoken(&vga_token);
}

static scr_stat *
alloc_scp(sc_softc_t *sc, int vty)
{
    scr_stat *scp;

    /* assert(sc_malloc) */

    scp = kmalloc(sizeof(scr_stat), M_SYSCONS, 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;
}

/*
 * NOTE: Must be called with vga_token held.
 */
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;
    scp->fbi_generation = sc->fbi_generation;
    callout_init_lk(&scp->blink_screen_ch, &syscons_blink_lk);
    if (scp->sc->fbi == NULL) {
        lwkt_gettoken(&vga_token);
        (*vidsw[sc->adapter]->get_info)(sc->adp, scp->mode, &info);
        lwkt_reltoken(&vga_token);
    }
    if (scp->sc->fbi != NULL) {
        scp->xpixel = sc->fbi->width;
        scp->ypixel = sc->fbi->height;
        scp->font_width = 8;
        scp->font_height = 16;

        /* The first vty uses a statically allocated 160x50 buffer */
        if (vty == sc->first_vty)
                sc_font_scale(scp, 2*COL, 2*ROW);
        else
                sc_font_scale(scp, 0, 0);

#ifndef SC_NO_FONT_LOADING
        scp->font = sc->font_16;
#else
        scp->font = NULL;
#endif
    } else 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/8;
        scp->ysize = info.vi_height/info.vi_cheight;
        scp->font_height = 0;
        scp->font_width = 0;
        scp->font = NULL;
    } else {
        scp->xsize = info.vi_width;
        scp->ysize = info.vi_height;
        scp->xpixel = scp->xsize*8;
        scp->ypixel = scp->ysize*info.vi_cheight;
        scp->font_width = 8;
        if (info.vi_cheight < 14) {
            scp->font_height = 8;
#ifndef SC_NO_FONT_LOADING
            scp->font = sc->font_8;
#else
            scp->font = NULL;
#endif
        } else if (info.vi_cheight >= 16) {
            scp->font_height = 16;
#ifndef SC_NO_FONT_LOADING
            scp->font = sc->font_16;
#else
            scp->font = NULL;
#endif
        } else {
            scp->font_height = 14;
#ifndef SC_NO_FONT_LOADING
            scp->font = sc->font_14;
#else
            scp->font = NULL;
#endif
        }
    }
    scp->xoff = scp->yoff = 0;
    scp->xpos = scp->ypos = 0;
    sc_vtb_init(&scp->vtb, VTB_MEMORY, 0, 0, NULL, FALSE);
    sc_vtb_init(&scp->scr, VTB_FRAMEBUFFER, 0, 0, NULL, FALSE);
    scp->start = scp->xsize * scp->ysize - 1;
    scp->end = 0;
    scp->tsw = NULL;
    scp->ts = NULL;
    scp->rndr = NULL;
    scp->border = SC_BORDER_COLOR;
    scp->cursor_base = sc->cursor_base;
    scp->cursor_height = imin(sc->cursor_height, scp->font_height);
    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;
}

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->model);
    }
    if (rndr == NULL && scp->sc->fbi != NULL) {
        rndr = sc_render_match(scp, "kms", scp->model);
    }
    if (rndr == NULL) {
        rndr = sc_render_match(scp, scp->sc->adp->va_name, scp->model);
        if (rndr == NULL) {
            return ENODEV;
        }
    }

    if (sw == scp->tsw) {
        error = (*sw->te_init)(scp, &scp->ts, SC_TE_WARM_INIT);
        scp->rndr = rndr;
        sc_clear_screen(scp);
        /* assert(error == 0); */
        return error;
    }

    if (sc_malloc && (sw->te_size > 0))
        p = kmalloc(sw->te_size, M_SYSCONS, 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)
        kfree(scp->ts, M_SYSCONS);
    scp->tsw = sw;
    scp->ts = p;
    scp->rndr = rndr;

    /* 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;

    lwkt_gettoken(&vga_token);
    if (sc->kbd == NULL) {
        lwkt_reltoken(&vga_token);
        return NOKEY;
    }

next_code:
#if 1
    /* I don't like this, but... XXX */
    if (flags & SCGETC_CN) {
        syscons_lock();
        sccnupdate(sc->cur_scp);
        syscons_unlock();
    }
#endif
    scp = sc->cur_scp;
    /* first see if there is something in the keyboard port */
    for (;;) {
        c = kbd_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) {
            lwkt_reltoken(&vga_token);
            return c;
        } else {
            break;
        }
    }

    /* make screensaver happy */
    if (!(c & RELKEY))
        sc_touch_scrn_saver();

    if (!(flags & SCGETC_CN))
        /* do the /dev/random device a favour */
        add_keyboard_randomness(c);

    if (scp->kbd_mode != K_XLATE) {
        lwkt_reltoken(&vga_token);
        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:
                kbd_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 = VIRTUAL_TTY(sc, scp->index);
                        if (ISTTYOPEN(tp))
                            scstart(tp);
#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)) {
                    lwkt_reltoken(&vga_token);
                    return c;
                }
                break;

            case SPSC:
#if NSPLASH > 0
                /* 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 explictly. 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 /* NSPLASH */
                break;

            case RBT:
#ifndef SC_DISABLE_REBOOT
                shutdown_nice(0);
#endif
                break;

            case HALT:
#ifndef SC_DISABLE_REBOOT
                shutdown_nice(RB_HALT);
#endif
                break;

            case PDWN:
#ifndef SC_DISABLE_REBOOT
                shutdown_nice(RB_HALT|RB_POWEROFF);
#endif
                break;

            case SUSP:
            case STBY:
                break;

            case DBG:
#ifndef SC_DISABLE_DDBKEY
#ifdef DDB
                lwkt_reltoken(&vga_token);
                Debugger("manual escape to debugger");
                lwkt_gettoken(&vga_token);
#else
                kprintf("No debugger in kernel\n");
#endif
#else /* SC_DISABLE_DDBKEY */
                /* do nothing */
#endif /* SC_DISABLE_DDBKEY */
                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 = VIRTUAL_TTY(sc, sc->first_vty + i);
                    if (ISTTYOPEN(tp)) {
                        syscons_lock();
                        sc_switch_scr(scp->sc, sc->first_vty + i);
                        syscons_unlock();
                        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 = VIRTUAL_TTY(sc, sc->first_vty + i);
                    if (ISTTYOPEN(tp)) {
                        syscons_lock();
                        sc_switch_scr(scp->sc, sc->first_vty + i);
                        syscons_unlock();
                        break;
                    }
                }
                break;

            default:
                if (KEYCHAR(c) >= F_SCR && KEYCHAR(c) <= L_SCR) {
                    syscons_lock();
                    sc_switch_scr(scp->sc, sc->first_vty + KEYCHAR(c) - F_SCR);
                    syscons_unlock();
                    break;
                }
                /* assert(c & FKEY) */
                if (!(sc->flags & SC_SCRN_BLANKED)) {
                    lwkt_reltoken(&vga_token);
                    return c;
                }
                break;
            }
            /* goto next_code */
        } else {
            /* regular keys (maybe MKEY is set) */
            if (!(sc->flags & SC_SCRN_BLANKED)) {
                lwkt_reltoken(&vga_token);
                return c;
            }
        }
    }

    goto next_code;
}

static int
scmmap(struct dev_mmap_args *ap)
{
    scr_stat *scp;

    lwkt_gettoken(&vga_token);
    scp = SC_STAT(ap->a_head.a_dev);
    if (scp != scp->sc->cur_scp) {
        lwkt_reltoken(&vga_token);
        return EINVAL;
    }
    if (scp->sc->fbi != NULL) {
        size_t sz =
            roundup(scp->sc->fbi->height * scp->sc->fbi->stride, PAGE_SIZE);
        if (ap->a_offset > sz - PAGE_SIZE) {
            lwkt_reltoken(&vga_token);
            return EINVAL;
        } else {
            /* This works for amdgpu(4) as well. */
            ap->a_result = atop(vtophys(scp->sc->fbi->vaddr + ap->a_offset));
        }
    } else {
        ap->a_result = (*vidsw[scp->sc->adapter]->mmap)(scp->sc->adp,
                                                        ap->a_offset,
                                                        ap->a_nprot);
    }
    lwkt_reltoken(&vga_token);
    return(0);
}

static int
save_kbd_state(scr_stat *scp, int unlock)
{
    int state;
    int error;

    WANT_UNLOCK(unlock);
    error = kbd_ioctl(scp->sc->kbd, KDGKBSTATE, (caddr_t)&state);
    WANT_LOCK(unlock);

    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 unlock)
{
    int state;
    int error;

    if (mask != LOCK_MASK) {
        WANT_UNLOCK(unlock);
        error = kbd_ioctl(scp->sc->kbd, KDGKBSTATE, (caddr_t)&state);
        WANT_LOCK(unlock);

        if (error == ENOIOCTL)
            error = ENODEV;
        if (error) {
            return error;
        }
        state &= ~mask;
        state |= new_bits & mask;
    } else {
        state = new_bits & LOCK_MASK;
    }
    WANT_UNLOCK(unlock);
    error = kbd_ioctl(scp->sc->kbd, KDSKBSTATE, (caddr_t)&state);
    WANT_LOCK(unlock);
    if (error == ENOIOCTL)
        error = ENODEV;
    return error;
}

static int
update_kbd_leds(scr_stat *scp, int which)
{
    int error;

    which &= LOCK_MASK;
    error = kbd_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;

    lwkt_gettoken(&vga_token);
    /* reject unsupported mode */
    if (scp->sc->fbi == NULL && (*vidsw[scp->sc->adapter]->get_info)(scp->sc->adp, scp->mode, &info)) {
        lwkt_reltoken(&vga_token);
        return 1;
    }

    /* if this vty is not currently showing, do nothing */
    if (scp != scp->sc->cur_scp) {
        lwkt_reltoken(&vga_token);
        return 0;
    }

    /* setup video hardware for the given mode */
    if (scp->sc->fbi == NULL) {
        (*vidsw[scp->sc->adapter]->set_mode)(scp->sc->adp, scp->mode);
        sc_vtb_init(&scp->scr, VTB_FRAMEBUFFER, scp->xsize, scp->ysize,
                    (void *)scp->sc->adp->va_window, FALSE);
    } else {
        goto done;
    }

#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_height < 14) {
                if (scp->sc->fonts_loaded & FONT_8)
                    sc_load_font(scp, 0, 8, scp->sc->font_8, 0, 256);
            } else if (scp->font_height >= 16) {
                if (scp->sc->fonts_loaded & FONT_16)
                    sc_load_font(scp, 0, 16, scp->sc->font_16, 0, 256);
            } else {
                if (scp->sc->fonts_loaded & FONT_14)
                    sc_load_font(scp, 0, 14, 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 */

    sc_set_border(scp, scp->border);
    sc_set_cursor_image(scp);

done:
    lwkt_reltoken(&vga_token);
    return 0;
}

void
refresh_ega_palette(scr_stat *scp)
{
    uint32_t r, g, b;
    int reg;
    int rsize, gsize, bsize;
    int rfld, gfld, bfld;
    int i;

    rsize = scp->sc->adp->va_info.vi_pixel_fsizes[0];
    gsize = scp->sc->adp->va_info.vi_pixel_fsizes[1];
    bsize = scp->sc->adp->va_info.vi_pixel_fsizes[2];
    rfld = scp->sc->adp->va_info.vi_pixel_fields[0];
    gfld = scp->sc->adp->va_info.vi_pixel_fields[1];
    bfld = scp->sc->adp->va_info.vi_pixel_fields[2];

    for (i = 0; i < 16; i++) {
        reg = scp->sc->adp->va_palette_regs[i];

        r = scp->sc->palette[reg * 3] >> (8 - rsize);
        g = scp->sc->palette[reg * 3 + 1] >> (8 - gsize);
        b = scp->sc->palette[reg * 3 + 2] >> (8 - bsize);

        scp->ega_palette[i] = (r << rfld) + (g << gfld) + (b << bfld);
    }
}

void
sc_set_border(scr_stat *scp, int color)
{
    atomic_add_int(&scp->sc->videoio_in_progress, 1);
    (*scp->rndr->draw_border)(scp, color);
    atomic_add_int(&scp->sc->videoio_in_progress, -1);
}

#ifndef SC_NO_FONT_LOADING
void
sc_load_font(scr_stat *scp, int page, int size, u_char *buf,
             int base, int count)
{
    sc_softc_t *sc;

    sc = scp->sc;
    sc->font_loading_in_progress = TRUE;
    (*vidsw[sc->adapter]->load_font)(sc->adp, page, size, buf, base, count);
    sc->font_loading_in_progress = FALSE;
}

void
sc_save_font(scr_stat *scp, int page, int size, u_char *buf,
             int base, int count)
{
    sc_softc_t *sc;

    sc = scp->sc;
    sc->font_loading_in_progress = TRUE;
    (*vidsw[sc->adapter]->save_font)(sc->adp, page, size, buf, base, count);
    sc->font_loading_in_progress = FALSE;
}

void
sc_show_font(scr_stat *scp, int page)
{
    (*vidsw[scp->sc->adapter]->show_font)(scp->sc->adp, page);
}
#endif /* !SC_NO_FONT_LOADING */

void
sc_paste(scr_stat *scp, u_char *p, int count) 
{
    struct tty *tp;
    u_char *rmap;

    /*
     * Holy hell, don't try to inject a paste buffer if the keyboard
     * is not in ascii mode!
     */
    if (scp->kbd_mode != K_XLATE)
        return;

    lwkt_gettoken(&vga_token);
    if (scp->status & MOUSE_VISIBLE) {
        tp = VIRTUAL_TTY(scp->sc, scp->sc->cur_scp->index);
        lwkt_gettoken(&tp->t_token);
        if (!ISTTYOPEN(tp)) {
            lwkt_reltoken(&tp->t_token);
            lwkt_reltoken(&vga_token);
            return;
        }
        rmap = scp->sc->scr_rmap;
        for (; count > 0; --count)
            (*linesw[tp->t_line].l_rint)(rmap[*p++], tp);
        lwkt_reltoken(&tp->t_token);
    }
    lwkt_reltoken(&vga_token);
}

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;
        lockmgr(&syscons_blink_lk, LK_EXCLUSIVE);
        sc_blink_screen(scp->sc->cur_scp);
        lockmgr(&syscons_blink_lk, LK_RELEASE);
    } else if (duration != 0 && pitch != 0) {
        if (scp != scp->sc->cur_scp)
            pitch *= 2;
        sysbeep(pitch, duration);
    }
}

/*
 * Blink the screen, called with the syscons_mtx and syscons_blink_lk
 * held.  Can be called directly or via the callout.
 */
static void
sc_blink_screen(scr_stat *scp)
{
    if (ISGRAPHSC(scp) || (scp->sc->blink_in_progress <= 1)) {
        scp->sc->blink_in_progress = 0;
        mark_all(scp);
        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(&scp->blink_screen_ch, hz / 10,
                      blink_screen_callout, scp);
    }
}

/*
 * Screen blink callout.  Note that there is a lock order
 * reversal between syscons_blink_lk and the syscons lock.
 * Acquire the syscons lock non-blocking.
 */
static void
blink_screen_callout(void *arg)
{
    scr_stat *scp = arg;

    if (syscons_lock_nonblock() == 0) {
        sc_blink_screen(scp);
        syscons_unlock();
    } else {
        callout_reset(&scp->blink_screen_ch, hz / 10,
                      blink_screen_callout, scp);
    }
}

/*
 * 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, 0);
                     idx != -1;
                     idx = kbd_find_keyboard2("*", -1, idx + 1, 0)) {
                        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;

                        kbd_ioctl(k0, KBADDKBD, (caddr_t) &ki);
                }
        } else
                idx0 = kbd_allocate("*", unit, (void *)&sc->keyboard, sckbdevent, sc);

        return (idx0);
}