/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1992-1998 Søren Schmidt
 * All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Sascha Wildner <saw@online.de>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer,
 *    without modification, immediately at the beginning of the file.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include "opt_syscons.h"
#include "opt_splash.h"
#include "opt_ddb.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/cons.h>
#include <sys/consio.h>
#include <sys/kdb.h>
#include <sys/eventhandler.h>
#include <sys/fbio.h>
#include <sys/kbio.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/pcpu.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/random.h>
#include <sys/reboot.h>
#include <sys/serial.h>
#include <sys/signalvar.h>
#include <sys/smp.h>
#include <sys/stdarg.h>
#include <sys/sysctl.h>
#include <sys/tty.h>
#include <sys/power.h>

#include <machine/clock.h>
#if defined(__arm__) || defined(__powerpc__)
#include <machine/sc_machdep.h>
#else
#include <machine/pc/display.h>
#endif
#if defined(__i386__) || defined(__amd64__)
#include <machine/psl.h>
#include <machine/frame.h>
#endif

#if defined(__amd64__) || defined(__i386__)
#include <machine/vmparam.h>

#include <vm/vm.h>
#include <vm/pmap.h>
#endif

#include <dev/kbd/kbdreg.h>
#include <dev/fb/fbreg.h>
#include <dev/fb/splashreg.h>
#include <dev/syscons/syscons.h>

#define COLD 0
#define WARM 1

#define DEFAULT_BLANKTIME (5 * 60) /* 5 minutes */
#define MAX_BLANKTIME (7 * 24 * 60 * 60) /* 7 days!? */

#define KEYCODE_BS 0x0e /* "<-- Backspace" key, XXX */

/* NULL-safe version of "tty_opened()" */
#define tty_opened_ns(tp) ((tp) != NULL && tty_opened(tp))

static u_char sc_kattrtab[MAXCPU];

static int sc_console_unit = -1;
static int sc_saver_keyb_only = 1;
static scr_stat *sc_console;
static struct consdev *sc_consptr;
static void *sc_kts[MAXCPU];
static struct sc_term_sw *sc_ktsw;
static scr_stat main_console;
static struct tty *main_devs[MAXCONS];

static char init_done = COLD;
static int shutdown_in_progress = FALSE;
static int suspend_in_progress = FALSE;
static char sc_malloc = FALSE;

static int saver_mode = CONS_NO_SAVER; /* LKM/user saver */
static int run_scrn_saver = FALSE; /* should run the saver? */
static int enable_bell = TRUE; /* enable beeper */

#ifndef SC_DISABLE_REBOOT
static int enable_reboot = TRUE; /* enable keyboard reboot */
#endif

#ifndef SC_DISABLE_KDBKEY
static int enable_kdbkey = TRUE; /* enable keyboard debug */
#endif

static long scrn_blank_time = 0; /* screen saver timeout value */
#ifdef DEV_SPLASH
static int scrn_blanked; /* # of blanked screen */
static int sticky_splash = FALSE;

static void
none_saver(sc_softc_t *sc, int blank)
{
}
static void (*current_saver)(sc_softc_t *, int) = none_saver;
#endif

#ifdef SC_NO_SUSPEND_VTYSWITCH
static int sc_no_suspend_vtswitch = 1;
#else
static int sc_no_suspend_vtswitch = 0;
#endif
static int sc_susp_scr;

static SYSCTL_NODE(_hw, OID_AUTO, syscons, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
    "syscons");
static SYSCTL_NODE(_hw_syscons, OID_AUTO, saver,
    CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
    "saver");
SYSCTL_INT(_hw_syscons_saver, OID_AUTO, keybonly, CTLFLAG_RW,
    &sc_saver_keyb_only, 0, "screen saver interrupted by input only");
SYSCTL_INT(
    _hw_syscons, OID_AUTO, bell, CTLFLAG_RW, &enable_bell, 0, "enable bell");
#ifndef SC_DISABLE_REBOOT
SYSCTL_INT(_hw_syscons, OID_AUTO, kbd_reboot, CTLFLAG_RW | CTLFLAG_SECURE,
    &enable_reboot, 0, "enable keyboard reboot");
#endif
#ifndef SC_DISABLE_KDBKEY
SYSCTL_INT(_hw_syscons, OID_AUTO, kbd_debug, CTLFLAG_RW | CTLFLAG_SECURE,
    &enable_kdbkey, 0, "enable keyboard debug");
#endif
SYSCTL_INT(_hw_syscons, OID_AUTO, sc_no_suspend_vtswitch, CTLFLAG_RWTUN,
    &sc_no_suspend_vtswitch, 0, "Disable VT switch before suspend.");
#if !defined(SC_NO_FONT_LOADING) && defined(SC_DFLT_FONT)
#include "font.h"
#endif

tsw_ioctl_t *sc_user_ioctl;

static bios_values_t bios_value;

static int enable_panic_key;
SYSCTL_INT(_machdep, OID_AUTO, enable_panic_key, CTLFLAG_RW, &enable_panic_key,
    0, "Enable panic via keypress specified in kbdmap(5)");

#define SC_CONSOLECTL 255

#define VTY_WCHAN(sc, vty) (&SC_DEV(sc, vty))

/* prototypes */
static int sc_allocate_keyboard(sc_softc_t *sc, int unit);
static int scvidprobe(int unit, int flags, int cons);
static int sckbdprobe(int unit, int flags, int cons);
static void scmeminit(void *arg);
static int scdevtounit(struct tty *tp);
static kbd_callback_func_t sckbdevent;
static void scinit(int unit, int flags);
static scr_stat *sc_get_stat(struct tty *tp);
static void scterm(int unit, int flags);
static void scshutdown(void *, int);
static void scsuspend(void *);
static void scresume(void *);
static u_int scgetc(sc_softc_t *sc, u_int flags, struct sc_cnstate *sp);
static void sc_puts(scr_stat *scp, u_char *buf, int len);
#define SCGETC_CN 1
#define SCGETC_NONBLOCK 2
static void sccnupdate(scr_stat *scp);
static scr_stat *alloc_scp(sc_softc_t *sc, int vty);
static void init_scp(sc_softc_t *sc, int vty, scr_stat *scp);
static callout_func_t scrn_timer;
static int and_region(int *s1, int *e1, int s2, int e2);
static void scrn_update(scr_stat *scp, int show_cursor);

#ifdef DEV_SPLASH
static int scsplash_callback(int event, void *arg);
static void scsplash_saver(sc_softc_t *sc, int show);
static int add_scrn_saver(void (*this_saver)(sc_softc_t *, int));
static int remove_scrn_saver(void (*this_saver)(sc_softc_t *, int));
static int set_scrn_saver_mode(
    scr_stat *scp, int mode, u_char *pal, int border);
static int restore_scrn_saver_mode(scr_stat *scp, int changemode);
static void stop_scrn_saver(sc_softc_t *sc, void (*saver)(sc_softc_t *, int));
static int wait_scrn_saver_stop(sc_softc_t *sc);
#define scsplash_stick(stick) (sticky_splash = (stick))
#else /* !DEV_SPLASH */
#define scsplash_stick(stick)
#endif /* DEV_SPLASH */

static int do_switch_scr(sc_softc_t *sc, int s);
static int vt_proc_alive(scr_stat *scp);
static int signal_vt_rel(scr_stat *scp);
static int signal_vt_acq(scr_stat *scp);
static int finish_vt_rel(scr_stat *scp, int release, int *s);
static int finish_vt_acq(scr_stat *scp);
static void exchange_scr(sc_softc_t *sc);
static void update_cursor_image(scr_stat *scp);
static void change_cursor_shape(scr_stat *scp, int flags, int base, int height);
static void update_font(scr_stat *);
static int save_kbd_state(scr_stat *scp);
static int update_kbd_state(scr_stat *scp, int state, int mask);
static int update_kbd_leds(scr_stat *scp, int which);
static int sc_kattr(void);
static callout_func_t blink_screen;
static struct tty *sc_alloc_tty(int, int);

static cn_probe_t sc_cnprobe;
static cn_init_t sc_cninit;
static cn_term_t sc_cnterm;
static cn_getc_t sc_cngetc;
static cn_putc_t sc_cnputc;
static cn_grab_t sc_cngrab;
static cn_ungrab_t sc_cnungrab;

CONSOLE_DRIVER(sc);

static tsw_open_t sctty_open;
static tsw_close_t sctty_close;
static tsw_outwakeup_t sctty_outwakeup;
static tsw_ioctl_t sctty_ioctl;
static tsw_mmap_t sctty_mmap;

static struct ttydevsw sc_ttydevsw = {
        .tsw_open = sctty_open,
        .tsw_close = sctty_close,
        .tsw_outwakeup = sctty_outwakeup,
        .tsw_ioctl = sctty_ioctl,
        .tsw_mmap = sctty_mmap,
};

static d_ioctl_t consolectl_ioctl;
static d_close_t consolectl_close;

static struct cdevsw consolectl_devsw = {
        .d_version = D_VERSION,
        .d_flags = D_NEEDGIANT | D_TRACKCLOSE,
        .d_ioctl = consolectl_ioctl,
        .d_close = consolectl_close,
        .d_name = "consolectl",
};

/* ec -- emergency console. */

static u_int ec_scroffset;

static void
ec_putc(int c)
{
        uintptr_t fb;
        u_short *scrptr;
        u_int ind;
        int attr, column, mysize, width, xsize, yborder, ysize;

        if (c < 0 || c > 0xff || c == '\a')
                return;
        if (sc_console == NULL) {
#if !defined(__amd64__) && !defined(__i386__)
                return;
#else
                /*
                 * This is enough for ec_putc() to work very early on x86
                 * if the kernel starts in normal color text mode.
                 */
#ifdef __amd64__
                fb = KERNBASE + 0xb8000;
#else /* __i386__ */
                fb = pmap_get_map_low() + 0xb8000;
#endif
                xsize = 80;
                ysize = 25;
#endif
        } else {
                if (!ISTEXTSC(&main_console))
                        return;
                fb = main_console.sc->adp->va_window;
                xsize = main_console.xsize;
                ysize = main_console.ysize;
        }
        yborder = ysize / 5;
        scrptr = (u_short *)(void *)fb + xsize * yborder;
        mysize = xsize * (ysize - 2 * yborder);
        do {
                ind = ec_scroffset;
                column = ind % xsize;
                width = (c == '\b' ?
                        -1 :
                        c == '\t' ?
                        (column + 8) & ~7 :
                        c == '\r' ? -column : c == '\n' ? xsize - column : 1);
                if (width == 0 || (width < 0 && ind < -width))
                        return;
        } while (atomic_cmpset_rel_int(&ec_scroffset, ind, ind + width) == 0);
        if (c == '\b' || c == '\r')
                return;
        if (c == '\n')
                ind += xsize; /* XXX clearing from new pos is not atomic */

        attr = sc_kattr();
        if (c == '\t' || c == '\n')
                c = ' ';
        do
                scrptr[ind++ % mysize] = (attr << 8) | c;
        while (--width != 0);
}

int
sc_probe_unit(int unit, int flags)
{
        if (!vty_enabled(VTY_SC))
                return ENXIO;
        if (!scvidprobe(unit, flags, FALSE)) {
                if (bootverbose)
                        printf("%s%d: no video adapter found.\n",
                            SC_DRIVER_NAME, unit);
                return ENXIO;
        }

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

        return 0;
}

/* probe video adapters, return TRUE if found */
static int
scvidprobe(int unit, int flags, int cons)
{
        /*
         * Access the video adapter driver through the back door!
         * Video adapter drivers need to be configured before syscons.
         * However, when syscons is being probed as the low-level console,
         * they have not been initialized yet.  We force them to initialize
         * themselves here. XXX
         */
        vid_configure(cons ? VIO_PROBE_ONLY : 0);

        return (vid_find_adapter("*", unit) >= 0);
}

/* probe the keyboard, return TRUE if found */
static int
sckbdprobe(int unit, int flags, int cons)
{
        /* access the keyboard driver through the backdoor! */
        kbd_configure(cons ? KB_CONF_PROBE_ONLY : 0);

        return (kbd_find_keyboard("*", unit) >= 0);
}

static char *
adapter_name(video_adapter_t *adp)
{
        static struct {
                int type;
                char *name[2];
        } names[] = {
                { KD_MONO, { "MDA", "MDA" } },
                { KD_HERCULES, { "Hercules", "Hercules" } },
                { KD_CGA, { "CGA", "CGA" } },
                { KD_EGA, { "EGA", "EGA (mono)" } },
                { KD_VGA, { "VGA", "VGA (mono)" } },
                { KD_TGA, { "TGA", "TGA" } },
                { -1, { "Unknown", "Unknown" } },
        };
        int i;

        for (i = 0; names[i].type != -1; ++i)
                if (names[i].type == adp->va_type)
                        break;
        return names[i].name[(adp->va_flags & V_ADP_COLOR) ? 0 : 1];
}

static void
sctty_outwakeup(struct tty *tp)
{
        size_t len;
        u_char buf[PCBURST];
        scr_stat *scp = sc_get_stat(tp);

        if (scp->status & SLKED ||
            (scp == scp->sc->cur_scp && scp->sc->blink_in_progress))
                return;

        for (;;) {
                len = ttydisc_getc(tp, buf, sizeof buf);
                if (len == 0)
                        break;
                SC_VIDEO_LOCK(scp->sc);
                sc_puts(scp, buf, len);
                SC_VIDEO_UNLOCK(scp->sc);
        }
}

static struct tty *
sc_alloc_tty(int index, int devnum)
{
        struct sc_ttysoftc *stc;
        struct tty *tp;

        /* Allocate TTY object and softc to store unit number. */
        stc = malloc(sizeof(struct sc_ttysoftc), M_DEVBUF, M_WAITOK);
        stc->st_index = index;
        stc->st_stat = NULL;
        tp = tty_alloc_mutex(&sc_ttydevsw, stc, &Giant);

        /* Create device node. */
        tty_makedev(tp, NULL, "v%r", devnum);

        return (tp);
}

#ifdef SC_PIXEL_MODE
static void
sc_set_vesa_mode(scr_stat *scp, sc_softc_t *sc, int unit)
{
        video_info_t info;
        u_char *font;
        int depth;
        int fontsize;
        int i;
        int vmode;

        vmode = 0;
        (void)resource_int_value("sc", unit, "vesa_mode", &vmode);
        if (vmode < M_VESA_BASE || vmode > M_VESA_MODE_MAX ||
            vidd_get_info(sc->adp, vmode, &info) != 0 ||
            !sc_support_pixel_mode(&info))
                vmode = 0;

        /*
         * If the mode is unset or unsupported, search for an available
         * 800x600 graphics mode with the highest color depth.
         */
        if (vmode == 0) {
                for (depth = 0, i = M_VESA_BASE; i <= M_VESA_MODE_MAX; i++)
                        if (vidd_get_info(sc->adp, i, &info) == 0 &&
                            info.vi_width == 800 && info.vi_height == 600 &&
                            sc_support_pixel_mode(&info) &&
                            info.vi_depth > depth) {
                                vmode = i;
                                depth = info.vi_depth;
                        }
                if (vmode == 0)
                        return;
                vidd_get_info(sc->adp, vmode, &info);
        }

#if !defined(SC_NO_FONT_LOADING) && defined(SC_DFLT_FONT)
        fontsize = info.vi_cheight;
#else
        fontsize = scp->font_size;
#endif
        if (fontsize < 14)
                fontsize = 8;
        else if (fontsize >= 16)
                fontsize = 16;
        else
                fontsize = 14;
#ifndef SC_NO_FONT_LOADING
        switch (fontsize) {
        case 8:
                if ((sc->fonts_loaded & FONT_8) == 0)
                        return;
                font = sc->font_8;
                break;
        case 14:
                if ((sc->fonts_loaded & FONT_14) == 0)
                        return;
                font = sc->font_14;
                break;
        case 16:
                if ((sc->fonts_loaded & FONT_16) == 0)
                        return;
                font = sc->font_16;
                break;
        }
#else
        font = NULL;
#endif
#ifdef DEV_SPLASH
        if ((sc->flags & SC_SPLASH_SCRN) != 0)
                splash_term(sc->adp);
#endif
#ifndef SC_NO_HISTORY
        if (scp->history != NULL) {
                sc_vtb_append(&scp->vtb, 0, scp->history,
                    scp->ypos * scp->xsize + scp->xpos);
                scp->history_pos = sc_vtb_tail(scp->history);
        }
#endif
        vidd_set_mode(sc->adp, vmode);
        scp->status |= (UNKNOWN_MODE | PIXEL_MODE | MOUSE_HIDDEN);
        scp->status &= ~(GRAPHICS_MODE | MOUSE_VISIBLE);
        scp->xpixel = info.vi_width;
        scp->ypixel = info.vi_height;
        scp->xsize = scp->xpixel / 8;
        scp->ysize = scp->ypixel / fontsize;
        scp->xpos = 0;
        scp->ypos = scp->ysize - 1;
        scp->xoff = scp->yoff = 0;
        scp->font = font;
        scp->font_size = fontsize;
        scp->font_width = 8;
        scp->start = scp->xsize * scp->ysize - 1;
        scp->end = 0;
        scp->cursor_pos = scp->cursor_oldpos = scp->xsize * scp->xsize;
        scp->mode = sc->initial_mode = vmode;
        sc_vtb_init(&scp->scr, VTB_FRAMEBUFFER, scp->xsize, scp->ysize,
            (void *)sc->adp->va_window, FALSE);
        sc_alloc_scr_buffer(scp, FALSE, FALSE);
        sc_init_emulator(scp, NULL);
#ifndef SC_NO_CUTPASTE
        sc_alloc_cut_buffer(scp, FALSE);
#endif
#ifndef SC_NO_HISTORY
        sc_alloc_history_buffer(scp, 0, 0, FALSE);
#endif
        sc_set_border(scp, scp->border);
        sc_set_cursor_image(scp);
        scp->status &= ~UNKNOWN_MODE;
#ifdef DEV_SPLASH
        if ((sc->flags & SC_SPLASH_SCRN) != 0)
                splash_init(sc->adp, scsplash_callback, sc);
#endif
}
#endif

int
sc_attach_unit(int unit, int flags)
{
        sc_softc_t *sc;
        scr_stat *scp;
        struct cdev *dev;
        void *oldts, *ts;
        int i, vc;

        if (!vty_enabled(VTY_SC))
                return ENXIO;

        flags &= ~SC_KERNEL_CONSOLE;

        if (sc_console_unit == unit) {
                /*
                 * If this unit is being used as the system console, we need to
                 * adjust some variables and buffers before and after scinit().
                 */
                /* assert(sc_console != NULL) */
                flags |= SC_KERNEL_CONSOLE;
                scmeminit(NULL);

                scinit(unit, flags);

                if (sc_console->tsw->te_size > 0) {
                        sc_ktsw = sc_console->tsw;
                        /* assert(sc_console->ts != NULL); */
                        oldts = sc_console->ts;
                        for (i = 0; i <= mp_maxid; i++) {
                                ts = malloc(sc_console->tsw->te_size, M_DEVBUF,
                                    M_WAITOK | M_ZERO);
                                (*sc_console->tsw->te_init)(
                                    sc_console, &ts, SC_TE_COLD_INIT);
                                sc_console->ts = ts;
                                (*sc_console->tsw->te_default_attr)(sc_console,
                                    sc_kattrtab[i], SC_KERNEL_CONS_REV_ATTR);
                                sc_kts[i] = ts;
                        }
                        sc_console->ts = oldts;
                        (*sc_console->tsw->te_default_attr)(
                            sc_console, SC_NORM_ATTR, SC_NORM_REV_ATTR);
                }
        } else {
                scinit(unit, flags);
        }

        sc = sc_get_softc(unit, flags & SC_KERNEL_CONSOLE);
        sc->config = flags;
        callout_init(&sc->ctimeout, 0);
        callout_init(&sc->cblink, 0);
        scp = sc_get_stat(sc->dev[0]);
        if (sc_console == NULL) /* sc_console_unit < 0 */
                sc_console = scp;

#ifdef SC_PIXEL_MODE
        if ((sc->config & SC_VESAMODE) != 0)
                sc_set_vesa_mode(scp, sc, unit);
#endif /* SC_PIXEL_MODE */

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

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

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

        printf("%s%d: %s <%d virtual consoles, flags=0x%x>\n", SC_DRIVER_NAME,
            unit, adapter_name(sc->adp), sc->vtys, sc->config);
        if (bootverbose) {
                printf("%s%d:", SC_DRIVER_NAME, unit);
                if (sc->adapter >= 0)
                        printf(" fb%d", sc->adapter);
                if (sc->kbd != NULL)
                        printf(", kbd%d", sc->kbd->kb_index);
                if (scp->tsw)
                        printf(", terminal emulator: %s (%s)",
                            scp->tsw->te_name, scp->tsw->te_desc);
                printf("\n");
        }

        /* Register suspend/resume/shutdown callbacks for the kernel console. */
        if (sc_console_unit == unit) {
                EVENTHANDLER_REGISTER(
                    power_suspend_early, scsuspend, NULL, EVENTHANDLER_PRI_ANY);
                EVENTHANDLER_REGISTER(
                    power_resume, scresume, NULL, EVENTHANDLER_PRI_ANY);
                EVENTHANDLER_REGISTER(
                    shutdown_pre_sync, scshutdown, NULL, SHUTDOWN_PRI_DEFAULT);
        }

        for (vc = 0; vc < sc->vtys; vc++) {
                if (sc->dev[vc] == NULL) {
                        sc->dev[vc] = sc_alloc_tty(vc, vc + unit * MAXCONS);
                        if (vc == 0 && sc->dev == main_devs)
                                SC_STAT(sc->dev[0]) = &main_console;
                }
                /*
                 * The first vty already has struct tty and scr_stat initialized
                 * in scinit().  The other vtys will have these structs when
                 * first opened.
                 */
        }

        dev = make_dev(
            &consolectl_devsw, 0, UID_ROOT, GID_WHEEL, 0600, "consolectl");
        dev->si_drv1 = sc->dev[0];

        return 0;
}

static void
scmeminit(void *arg)
{
        if (!vty_enabled(VTY_SC))
                return;
        if (sc_malloc)
                return;
        sc_malloc = TRUE;

        /*
         * As soon as malloc() becomes functional, we had better allocate
         * various buffers for the kernel console.
         */

        if (sc_console_unit < 0) /* sc_console == NULL */
                return;

        /* copy the temporary buffer to the final buffer */
        sc_alloc_scr_buffer(sc_console, FALSE, FALSE);

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

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

/* XXX */
SYSINIT(sc_mem, SI_SUB_KMEM, SI_ORDER_ANY, scmeminit, NULL);

static int
scdevtounit(struct tty *tp)
{
        int vty = SC_VTY(tp);

        if (vty == SC_CONSOLECTL)
                return ((sc_console != NULL) ? sc_console->sc->unit : -1);
        else if ((vty < 0) || (vty >= MAXCONS * sc_max_unit()))
                return -1;
        else
                return vty / MAXCONS;
}

static int
sctty_open(struct tty *tp)
{
        int unit = scdevtounit(tp);
        sc_softc_t *sc;
        scr_stat *scp;
        keyarg_t key;

        DPRINTF(5,
            ("scopen: dev:%s, unit:%d, vty:%d\n", devtoname(tp->t_dev), unit,
                SC_VTY(tp)));

        sc = sc_get_softc(
            unit, (sc_console_unit == unit) ? SC_KERNEL_CONSOLE : 0);
        if (sc == NULL)
                return ENXIO;

        if (!tty_opened(tp)) {
                /* Use the current setting of the <-- key as default VERASE. */
                /* If the Delete key is preferable, an stty is necessary     */
                if (sc->kbd != NULL) {
                        key.keynum = KEYCODE_BS;
                        (void)kbdd_ioctl(sc->kbd, GIO_KEYMAPENT, (caddr_t)&key);
                        tp->t_termios.c_cc[VERASE] = key.key.map[0];
                }
        }

        scp = sc_get_stat(tp);
        if (scp == NULL) {
                scp = SC_STAT(tp) = alloc_scp(sc, SC_VTY(tp));
                if (ISGRAPHSC(scp))
                        sc_set_pixel_mode(scp, NULL, 0, 0, 16, 8);
        }
        if (!tp->t_winsize.ws_col && !tp->t_winsize.ws_row) {
                tp->t_winsize.ws_col = scp->xsize;
                tp->t_winsize.ws_row = scp->ysize;
        }

        return (0);
}

static void
sctty_close(struct tty *tp)
{
        scr_stat *scp;
        int s;

        if (SC_VTY(tp) != SC_CONSOLECTL) {
                scp = sc_get_stat(tp);
                /* were we in the middle of the VT switching process? */
                DPRINTF(5, ("sc%d: scclose(), ", scp->sc->unit));
                s = spltty();
                if ((scp == scp->sc->cur_scp) &&
                    (scp->sc->unit == sc_console_unit))
                        cnavailable(sc_consptr, TRUE);
                if (finish_vt_rel(scp, TRUE, &s) == 0) /* force release */
                        DPRINTF(5, ("reset WAIT_REL, "));
                if (finish_vt_acq(scp) == 0) /* force acknowledge */
                        DPRINTF(5, ("reset WAIT_ACQ, "));
#ifdef not_yet_done
                if (scp == &main_console) {
                        scp->pid = 0;
                        scp->proc = NULL;
                        scp->smode.mode = VT_AUTO;
                } else {
                        sc_vtb_destroy(&scp->vtb);
                        sc_vtb_destroy(&scp->scr);
                        sc_free_history_buffer(scp, scp->ysize);
                        SC_STAT(tp) = NULL;
                        free(scp, M_DEVBUF);
                }
#else
                scp->pid = 0;
                scp->proc = NULL;
                scp->smode.mode = VT_AUTO;
#endif
                scp->kbd_mode = K_XLATE;
                if (scp == scp->sc->cur_scp)
                        (void)kbdd_ioctl(
                            scp->sc->kbd, KDSKBMODE, (caddr_t)&scp->kbd_mode);
                DPRINTF(5, ("done.\n"));
        }
}

#if 0 /* XXX mpsafetty: fix screensaver. What about outwakeup? */
static int
scread(struct cdev *dev, struct uio *uio, int flag)
{
    if (!sc_saver_keyb_only)
        sc_touch_scrn_saver();
    return ttyread(dev, uio, flag);
}
#endif

static int
sckbdevent(keyboard_t *thiskbd, int event, void *arg)
{
        sc_softc_t *sc;
        struct tty *cur_tty;
        int c, error = 0;
        size_t len;
        const u_char *cp;

        sc = (sc_softc_t *)arg;
        /* assert(thiskbd == sc->kbd) */

        mtx_lock(&Giant);

        switch (event) {
        case KBDIO_KEYINPUT:
                break;
        case KBDIO_UNLOADING:
                sc->kbd = NULL;
                kbd_release(thiskbd, (void *)&sc->kbd);
                goto done;
        default:
                error = EINVAL;
                goto done;
        }

        /*
         * Loop while there is still input to get from the keyboard.
         * I don't think this is nessesary, and it doesn't fix
         * the Xaccel-2.1 keyboard hang, but it can't hurt.             XXX
         */
        while ((c = scgetc(sc, SCGETC_NONBLOCK, NULL)) != NOKEY) {
                cur_tty = SC_DEV(sc, sc->cur_scp->index);
                if (!tty_opened_ns(cur_tty))
                        continue;

                if ((*sc->cur_scp->tsw->te_input)(sc->cur_scp, c, cur_tty))
                        continue;

                switch (KEYFLAGS(c)) {
                case 0x0000: /* normal key */
                        ttydisc_rint(cur_tty, KEYCHAR(c), 0);
                        break;
                case FKEY: /* function key, return string */
                        cp = (*sc->cur_scp->tsw->te_fkeystr)(sc->cur_scp, c);
                        if (cp != NULL) {
                                ttydisc_rint_simple(cur_tty, cp, strlen(cp));
                                break;
                        }
                        cp = kbdd_get_fkeystr(thiskbd, KEYCHAR(c), &len);
                        if (cp != NULL)
                                ttydisc_rint_simple(cur_tty, cp, len);
                        break;
                case MKEY: /* meta is active, prepend ESC */
                        ttydisc_rint(cur_tty, 0x1b, 0);
                        ttydisc_rint(cur_tty, KEYCHAR(c), 0);
                        break;
                case BKEY: /* backtab fixed sequence (esc [ Z) */
                        ttydisc_rint_simple(cur_tty, "\x1B[Z", 3);
                        break;
                }

                ttydisc_rint_done(cur_tty);
        }

        sc->cur_scp->status |= MOUSE_HIDDEN;

done:
        mtx_unlock(&Giant);
        return (error);
}

static int
sctty_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
{
        int error;
        int i;
        struct cursor_attr *cap;
        sc_softc_t *sc;
        scr_stat *scp;
        int s;
#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
        int ival;
#endif

        /* If there is a user_ioctl function call that first */
        if (sc_user_ioctl) {
                error = (*sc_user_ioctl)(tp, cmd, data, td);
                if (error != ENOIOCTL)
                        return error;
        }

        error = sc_vid_ioctl(tp, cmd, data, td);
        if (error != ENOIOCTL)
                return error;

#ifndef SC_NO_HISTORY
        error = sc_hist_ioctl(tp, cmd, data, td);
        if (error != ENOIOCTL)
                return error;
#endif

#ifndef SC_NO_SYSMOUSE
        error = sc_mouse_ioctl(tp, cmd, data, td);
        if (error != ENOIOCTL)
                return error;
#endif

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

        if (scp->tsw) {
                error = (*scp->tsw->te_ioctl)(scp, tp, cmd, data, td);
                if (error != ENOIOCTL)
                        return error;
        }

        switch (cmd) { /* process console hardware related ioctl's */

        case GIO_ATTR: /* get current attributes */
                /* this ioctl is not processed here, but in the terminal
                 * emulator */
                return ENOTTY;

        case GIO_COLOR: /* is this a color console ? */
                *(int *)data = (sc->adp->va_flags & V_ADP_COLOR) ? 1 : 0;
                return 0;

        case CONS_BLANKTIME: /* set screen saver timeout (0 = no saver) */
                if (*(int *)data < 0 || *(int *)data > MAX_BLANKTIME)
                        return EINVAL;
                s = spltty();
                scrn_blank_time = *(int *)data;
                run_scrn_saver = (scrn_blank_time != 0);
                splx(s);
                return 0;

        case CONS_CURSORTYPE: /* set cursor type (old interface + HIDDEN) */
                s = spltty();
                *(int *)data &= CONS_CURSOR_ATTRS;
                sc_change_cursor_shape(scp, *(int *)data, -1, -1);
                splx(s);
                return 0;

        case CONS_GETCURSORSHAPE: /* get cursor shape (new interface) */
                switch (((int *)data)[0] &
                    (CONS_DEFAULT_CURSOR | CONS_LOCAL_CURSOR)) {
                case 0:
                        cap = &sc->curs_attr;
                        break;
                case CONS_LOCAL_CURSOR:
                        cap = &scp->base_curs_attr;
                        break;
                case CONS_DEFAULT_CURSOR:
                        cap = &sc->dflt_curs_attr;
                        break;
                case CONS_DEFAULT_CURSOR | CONS_LOCAL_CURSOR:
                        cap = &scp->dflt_curs_attr;
                        break;
                }
                if (((int *)data)[0] & CONS_CHARCURSOR_COLORS) {
                        ((int *)data)[1] = cap->bg[0];
                        ((int *)data)[2] = cap->bg[1];
                } else if (((int *)data)[0] & CONS_MOUSECURSOR_COLORS) {
                        ((int *)data)[1] = cap->mouse_ba;
                        ((int *)data)[2] = cap->mouse_ia;
                } else {
                        ((int *)data)[1] = cap->base;
                        ((int *)data)[2] = cap->height;
                }
                ((int *)data)[0] = cap->flags;
                return 0;

        case CONS_SETCURSORSHAPE: /* set cursor shape (new interface) */
                s = spltty();
                sc_change_cursor_shape(
                    scp, ((int *)data)[0], ((int *)data)[1], ((int *)data)[2]);
                splx(s);
                return 0;

        case CONS_BELLTYPE: /* set bell type sound/visual */
                if ((*(int *)data) & CONS_VISUAL_BELL)
                        sc->flags |= SC_VISUAL_BELL;
                else
                        sc->flags &= ~SC_VISUAL_BELL;
                if ((*(int *)data) & CONS_QUIET_BELL)
                        sc->flags |= SC_QUIET_BELL;
                else
                        sc->flags &= ~SC_QUIET_BELL;
                return 0;

        case CONS_GETINFO: /* get current (virtual) console info */
        {
                vid_info_t *ptr = (vid_info_t *)data;
                if (ptr->size == sizeof(struct vid_info)) {
                        ptr->m_num = sc->cur_scp->index;
                        ptr->font_size = scp->font_size;
                        ptr->mv_col = scp->xpos;
                        ptr->mv_row = scp->ypos;
                        ptr->mv_csz = scp->xsize;
                        ptr->mv_rsz = scp->ysize;
                        ptr->mv_hsz =
                            (scp->history != NULL) ? scp->history->vtb_rows : 0;
                        /*
                         * The following fields are filled by the terminal
                         * emulator. XXX
                         *
                         * ptr->mv_norm.fore
                         * ptr->mv_norm.back
                         * ptr->mv_rev.fore
                         * ptr->mv_rev.back
                         */
                        ptr->mv_grfc.fore = 0; /* not supported */
                        ptr->mv_grfc.back = 0; /* not supported */
                        ptr->mv_ovscan = scp->border;
                        if (scp == sc->cur_scp)
                                save_kbd_state(scp);
                        ptr->mk_keylock = scp->status & LOCK_MASK;
                        return 0;
                }
                return EINVAL;
        }

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

        case CONS_IDLE: /* see if the screen has been idle */
                /*
                 * When the screen is in the GRAPHICS_MODE or UNKNOWN_MODE,
                 * the user process may have been writing something on the
                 * screen and syscons is not aware of it. Declare the screen
                 * is NOT idle if it is in one of these modes. But there is
                 * an exception to it; if a screen saver is running in the
                 * graphics mode in the current screen, we should say that the
                 * screen has been idle.
                 */
                *(int *)data = (sc->flags & SC_SCRN_IDLE) &&
                    (!ISGRAPHSC(sc->cur_scp) ||
                        (sc->cur_scp->status & SAVER_RUNNING));
                return 0;

        case CONS_SAVERMODE: /* set saver mode */
                switch (*(int *)data) {
                case CONS_NO_SAVER:
                case CONS_USR_SAVER:
                        /* if a LKM screen saver is running, stop it first. */
                        scsplash_stick(FALSE);
                        saver_mode = *(int *)data;
                        s = spltty();
#ifdef DEV_SPLASH
                        if ((error = wait_scrn_saver_stop(NULL))) {
                                splx(s);
                                return error;
                        }
#endif
                        run_scrn_saver = TRUE;
                        if (saver_mode == CONS_USR_SAVER)
                                scp->status |= SAVER_RUNNING;
                        else
                                scp->status &= ~SAVER_RUNNING;
                        scsplash_stick(TRUE);
                        splx(s);
                        break;
                case CONS_LKM_SAVER:
                        s = spltty();
                        if ((saver_mode == CONS_USR_SAVER) &&
                            (scp->status & SAVER_RUNNING))
                                scp->status &= ~SAVER_RUNNING;
                        saver_mode = *(int *)data;
                        splx(s);
                        break;
                default:
                        return EINVAL;
                }
                return 0;

        case CONS_SAVERSTART: /* immediately start/stop the screen saver */
                /*
                 * Note that this ioctl does not guarantee the screen saver
                 * actually starts or stops. It merely attempts to do so...
                 */
                s = spltty();
                run_scrn_saver = (*(int *)data != 0);
                if (run_scrn_saver)
                        sc->scrn_time_stamp -= scrn_blank_time;
                splx(s);
                return 0;

        case CONS_SCRSHOT: /* get a screen shot */
        {
                int retval, hist_rsz;
                size_t lsize, csize;
                vm_offset_t frbp, hstp;
                unsigned lnum;
                scrshot_t *ptr = (scrshot_t *)data;
                void *outp = ptr->buf;

                if (ptr->x < 0 || ptr->y < 0 || ptr->xsize < 0 ||
                    ptr->ysize < 0)
                        return EINVAL;
                s = spltty();
                if (ISGRAPHSC(scp)) {
                        splx(s);
                        return EOPNOTSUPP;
                }
                hist_rsz = (scp->history != NULL) ? scp->history->vtb_rows : 0;
                if (((u_int)ptr->x + ptr->xsize) > scp->xsize ||
                    ((u_int)ptr->y + ptr->ysize) > (scp->ysize + hist_rsz)) {
                        splx(s);
                        return EINVAL;
                }

                lsize = scp->xsize * sizeof(u_int16_t);
                csize = ptr->xsize * sizeof(u_int16_t);
                /* Pointer to the last line of framebuffer */
                frbp = scp->vtb.vtb_buffer + scp->ysize * lsize +
                    ptr->x * sizeof(u_int16_t);
                /* Pointer to the last line of target buffer */
                outp = (char *)outp + ptr->ysize * csize;
                /* Pointer to the last line of history buffer */
                if (scp->history != NULL)
                        hstp = scp->history->vtb_buffer +
                            sc_vtb_tail(scp->history) * sizeof(u_int16_t) +
                            ptr->x * sizeof(u_int16_t);
                else
                        hstp = 0;

                retval = 0;
                for (lnum = 0; lnum < (ptr->y + ptr->ysize); lnum++) {
                        if (lnum < scp->ysize) {
                                frbp -= lsize;
                        } else {
                                hstp -= lsize;
                                if (hstp < scp->history->vtb_buffer)
                                        hstp += scp->history->vtb_rows * lsize;
                                frbp = hstp;
                        }
                        if (lnum < ptr->y)
                                continue;
                        outp = (char *)outp - csize;
                        retval = copyout((void *)frbp, outp, csize);
                        if (retval != 0)
                                break;
                }
                splx(s);
                return retval;
        }

        case VT_SETMODE: /* set screen switcher mode */
        {
                struct vt_mode *mode;
                struct proc *p1;

                mode = (struct vt_mode *)data;
                DPRINTF(5, ("%s%d: VT_SETMODE ", SC_DRIVER_NAME, sc->unit));
                if (scp->smode.mode == VT_PROCESS) {
                        p1 = pfind(scp->pid);
                        if (scp->proc == p1 && scp->proc != td->td_proc) {
                                if (p1)
                                        PROC_UNLOCK(p1);
                                DPRINTF(5, ("error EPERM\n"));
                                return EPERM;
                        }
                        if (p1)
                                PROC_UNLOCK(p1);
                }
                s = spltty();
                if (mode->mode == VT_AUTO) {
                        scp->smode.mode = VT_AUTO;
                        scp->proc = NULL;
                        scp->pid = 0;
                        DPRINTF(5, ("VT_AUTO, "));
                        if ((scp == sc->cur_scp) &&
                            (sc->unit == sc_console_unit))
                                cnavailable(sc_consptr, TRUE);
                        /* were we in the middle of the vty switching process?
                         */
                        if (finish_vt_rel(scp, TRUE, &s) == 0)
                                DPRINTF(5, ("reset WAIT_REL, "));
                        if (finish_vt_acq(scp) == 0)
                                DPRINTF(5, ("reset WAIT_ACQ, "));
                } else {
                        if (!ISSIGVALID(mode->relsig) ||
                            !ISSIGVALID(mode->acqsig) ||
                            !ISSIGVALID(mode->frsig)) {
                                splx(s);
                                DPRINTF(5, ("error EINVAL\n"));
                                return EINVAL;
                        }
                        DPRINTF(5, ("VT_PROCESS %d, ", td->td_proc->p_pid));
                        bcopy(data, &scp->smode, sizeof(struct vt_mode));
                        scp->proc = td->td_proc;
                        scp->pid = scp->proc->p_pid;
                        if ((scp == sc->cur_scp) &&
                            (sc->unit == sc_console_unit))
                                cnavailable(sc_consptr, FALSE);
                }
                splx(s);
                DPRINTF(5, ("\n"));
                return 0;
        }

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

#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
        case _IO('v', 4):
                ival = IOCPARM_IVAL(data);
                data = (caddr_t)&ival;
                /* FALLTHROUGH */
#endif
        case VT_RELDISP: /* screen switcher ioctl */
                s = spltty();
                /*
                 * This must be the current vty which is in the VT_PROCESS
                 * switching mode...
                 */
                if ((scp != sc->cur_scp) || (scp->smode.mode != VT_PROCESS)) {
                        splx(s);
                        return EINVAL;
                }
                /* ...and this process is controlling it. */
                if (scp->proc != td->td_proc) {
                        splx(s);
                        return EPERM;
                }
                error = EINVAL;
                switch (*(int *)data) {
                case VT_FALSE: /* user refuses to release screen, abort */
                        if ((error = finish_vt_rel(scp, FALSE, &s)) == 0)
                                DPRINTF(5,
                                    ("%s%d: VT_FALSE\n", SC_DRIVER_NAME,
                                        sc->unit));
                        break;
                case VT_TRUE: /* user has released screen, go on */
                        if ((error = finish_vt_rel(scp, TRUE, &s)) == 0)
                                DPRINTF(5,
                                    ("%s%d: VT_TRUE\n", SC_DRIVER_NAME,
                                        sc->unit));
                        break;
                case VT_ACKACQ: /* acquire acknowledged, switch completed */
                        if ((error = finish_vt_acq(scp)) == 0)
                                DPRINTF(5,
                                    ("%s%d: VT_ACKACQ\n", SC_DRIVER_NAME,
                                        sc->unit));
                        break;
                default:
                        break;
                }
                splx(s);
                return error;

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

#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
        case _IO('v', 5):
                ival = IOCPARM_IVAL(data);
                data = (caddr_t)&ival;
                /* FALLTHROUGH */
#endif
        case VT_ACTIVATE: /* switch to screen *data */
                i = (*(int *)data == 0) ? scp->index : (*(int *)data - 1);
                s = spltty();
                error = sc_clean_up(sc->cur_scp);
                splx(s);
                if (error)
                        return error;
                error = sc_switch_scr(sc, i);
                return (error);

#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
        case _IO('v', 6):
                ival = IOCPARM_IVAL(data);
                data = (caddr_t)&ival;
                /* FALLTHROUGH */
#endif
        case VT_WAITACTIVE: /* wait for switch to occur */
                i = (*(int *)data == 0) ? scp->index : (*(int *)data - 1);
                if ((i < sc->first_vty) || (i >= sc->first_vty + sc->vtys))
                        return EINVAL;
                if (i == sc->cur_scp->index)
                        return 0;
                error =
                    tsleep(VTY_WCHAN(sc, i), PZERO | PCATCH, "waitvt", 0);
                return error;

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

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

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

        case KDENABIO: /* allow io operations */
                error = priv_check(td, PRIV_IO);
                if (error != 0)
                        return error;
                error = securelevel_gt(td->td_ucred, 0);
                if (error != 0)
                        return error;
#ifdef __i386__
                td->td_frame->tf_eflags |= PSL_IOPL;
#elif defined(__amd64__)
                td->td_frame->tf_rflags |= PSL_IOPL;
#endif
                return 0;

        case KDDISABIO: /* disallow io operations (default) */
#ifdef __i386__
                td->td_frame->tf_eflags &= ~PSL_IOPL;
#elif defined(__amd64__)
                td->td_frame->tf_rflags &= ~PSL_IOPL;
#endif
                return 0;

#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
        case _IO('K', 20):
                ival = IOCPARM_IVAL(data);
                data = (caddr_t)&ival;
                /* FALLTHROUGH */
#endif
        case KDSKBSTATE: /* set keyboard state (locks) */
                if (*(int *)data & ~LOCK_MASK)
                        return EINVAL;
                scp->status &= ~LOCK_MASK;
                scp->status |= *(int *)data;
                if (scp == sc->cur_scp)
                        update_kbd_state(scp, scp->status, LOCK_MASK);
                return 0;

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

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

#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
        case _IO('K', 67):
                ival = IOCPARM_IVAL(data);
                data = (caddr_t)&ival;
                /* FALLTHROUGH */
#endif
        case KDSETRAD: /* set keyboard repeat & delay rates (old) */
                if (*(int *)data & ~0x7f)
                        return EINVAL;
                error = kbdd_ioctl(sc->kbd, KDSETRAD, data);
                if (error == ENOIOCTL)
                        error = ENODEV;
                return error;

#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
        case _IO('K', 7):
                ival = IOCPARM_IVAL(data);
                data = (caddr_t)&ival;
                /* FALLTHROUGH */
#endif
        case KDSKBMODE: /* set keyboard mode */
                switch (*(int *)data) {
                case K_XLATE: /* switch to XLT ascii mode */
                case K_RAW: /* switch to RAW scancode mode */
                case K_CODE: /* switch to CODE mode */
                        scp->kbd_mode = *(int *)data;
                        if (scp == sc->cur_scp)
                                (void)kbdd_ioctl(sc->kbd, KDSKBMODE, data);
                        return 0;
                default:
                        return EINVAL;
                }
                /* NOT REACHED */

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

        case KDGKBINFO:
                error = kbdd_ioctl(sc->kbd, cmd, data);
                if (error == ENOIOCTL)
                        error = ENODEV;
                return error;

#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
        case _IO('K', 8):
                ival = IOCPARM_IVAL(data);
                data = (caddr_t)&ival;
                /* FALLTHROUGH */
#endif
        case KDMKTONE: /* sound the bell */
                if (*(int *)data)
                        sc_bell(scp, (*(int *)data) & 0xffff,
                            (((*(int *)data) >> 16) & 0xffff) * hz / 1000);
                else
                        sc_bell(scp, scp->bell_pitch, scp->bell_duration);
                return 0;

#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
        case _IO('K', 63):
                ival = IOCPARM_IVAL(data);
                data = (caddr_t)&ival;
                /* FALLTHROUGH */
#endif
        case KIOCSOUND: /* make tone (*data) hz */
                if (scp == sc->cur_scp) {
                        if (*(int *)data)
                                return sc_tone(*(int *)data);
                        else
                                return sc_tone(0);
                }
                return 0;

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

#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
        case _IO('K', 66):
                ival = IOCPARM_IVAL(data);
                data = (caddr_t)&ival;
                /* FALLTHROUGH */
#endif
        case KDSETLED: /* set keyboard LED status */
                if (*(int *)data & ~LED_MASK) /* FIXME: LOCK_MASK? */
                        return EINVAL;
                scp->status &= ~LED_MASK;
                scp->status |= *(int *)data;
                if (scp == sc->cur_scp)
                        update_kbd_leds(scp, scp->status);
                return 0;

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

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

#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
        case _IO('c', 110):
                ival = IOCPARM_IVAL(data);
                data = (caddr_t)&ival;
                /* FALLTHROUGH */
#endif
        case CONS_SETKBD: /* set the new keyboard */
        {
                keyboard_t *newkbd;

                s = spltty();
                newkbd = kbd_get_keyboard(*(int *)data);
                if (newkbd == NULL) {
                        splx(s);
                        return EINVAL;
                }
                error = 0;
                if (sc->kbd != newkbd) {
                        i = kbd_allocate(newkbd->kb_name, newkbd->kb_unit,
                            (void *)&sc->kbd, sckbdevent, sc);
                        /* i == newkbd->kb_index */
                        if (i >= 0) {
                                if (sc->kbd != NULL) {
                                        save_kbd_state(sc->cur_scp);
                                        kbd_release(
                                            sc->kbd, (void *)&sc->kbd);
                                }
                                sc->kbd =
                                    kbd_get_keyboard(i); /* sc->kbd == newkbd */
                                (void)kbdd_ioctl(sc->kbd, KDSKBMODE,
                                    (caddr_t)&sc->cur_scp->kbd_mode);
                                update_kbd_state(sc->cur_scp,
                                    sc->cur_scp->status, LOCK_MASK);
                        } else {
                                error = EPERM; /* XXX */
                        }
                }
                splx(s);
                return error;
        }

        case CONS_RELKBD: /* release the current keyboard */
                s = spltty();
                error = 0;
                if (sc->kbd != NULL) {
                        save_kbd_state(sc->cur_scp);
                        error = kbd_release(sc->kbd, (void *)&sc->kbd);
                        if (error == 0)
                                sc->kbd = NULL;
                }
                splx(s);
                return error;

        case CONS_GETTERM: /* get the current terminal emulator info */
        {
                sc_term_sw_t *sw;

                if (((term_info_t *)data)->ti_index == 0) {
                        sw = scp->tsw;
                } else {
                        sw = sc_term_match_by_number(
                            ((term_info_t *)data)->ti_index);
                }
                if (sw != NULL) {
                        strncpy(((term_info_t *)data)->ti_name, sw->te_name,
                            sizeof(((term_info_t *)data)->ti_name));
                        strncpy(((term_info_t *)data)->ti_desc, sw->te_desc,
                            sizeof(((term_info_t *)data)->ti_desc));
                        ((term_info_t *)data)->ti_flags = 0;
                        return 0;
                } else {
                        ((term_info_t *)data)->ti_name[0] = '\0';
                        ((term_info_t *)data)->ti_desc[0] = '\0';
                        ((term_info_t *)data)->ti_flags = 0;
                        return EINVAL;
                }
        }

        case CONS_SETTERM: /* set the current terminal emulator */
                s = spltty();
                error = sc_init_emulator(scp, ((term_info_t *)data)->ti_name);
                /* FIXME: what if scp == sc_console! XXX */
                splx(s);
                return error;

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

        case PIO_SCRNMAP: /* set output translation table */
                bcopy(data, &sc->scr_map, sizeof(sc->scr_map));
                for (i = 0; i < sizeof(sc->scr_map); i++) {
                        sc->scr_rmap[sc->scr_map[i]] = i;
                }
                return 0;

        case GIO_KEYMAP: /* get keyboard translation table */
        case PIO_KEYMAP: /* set keyboard translation table */
        case GIO_DEADKEYMAP: /* get accent key translation table */
        case PIO_DEADKEYMAP: /* set accent key translation table */
#ifdef COMPAT_FREEBSD13
        case OGIO_KEYMAP: /* get keyboard translation table (compat) */
        case OPIO_KEYMAP: /* set keyboard translation table (compat) */
        case OGIO_DEADKEYMAP: /* get accent key translation table (compat) */
        case OPIO_DEADKEYMAP: /* set accent key translation table (compat) */
#endif /* COMPAT_FREEBSD13 */
        case GETFKEY: /* get function key string */
        case SETFKEY: /* set function key string */
                error = kbdd_ioctl(sc->kbd, cmd, data);
                if (error == ENOIOCTL)
                        error = ENODEV;
                return error;

#ifndef SC_NO_FONT_LOADING

        case PIO_FONT8x8: /* set 8x8 dot font */
                if (!ISFONTAVAIL(sc->adp->va_flags))
                        return ENXIO;
                bcopy(data, sc->font_8, 8 * 256);
                sc->fonts_loaded |= FONT_8;
                /*
                 * FONT KLUDGE
                 * Always use the font page #0. XXX
                 * Don't load if the current font size is not 8x8.
                 */
                if (ISTEXTSC(sc->cur_scp) && (sc->cur_scp->font_size < 14))
                        sc_load_font(sc->cur_scp, 0, 8, 8, sc->font_8, 0, 256);
                return 0;

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

        case PIO_FONT8x14: /* set 8x14 dot font */
                if (!ISFONTAVAIL(sc->adp->va_flags))
                        return ENXIO;
                bcopy(data, sc->font_14, 14 * 256);
                sc->fonts_loaded |= FONT_14;
                /*
                 * FONT KLUDGE
                 * Always use the font page #0. XXX
                 * Don't load if the current font size is not 8x14.
                 */
                if (ISTEXTSC(sc->cur_scp) && (sc->cur_scp->font_size >= 14) &&
                    (sc->cur_scp->font_size < 16))
                        sc_load_font(
                            sc->cur_scp, 0, 14, 8, sc->font_14, 0, 256);
                return 0;

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

        case PIO_FONT8x16: /* set 8x16 dot font */
                if (!ISFONTAVAIL(sc->adp->va_flags))
                        return ENXIO;
                bcopy(data, sc->font_16, 16 * 256);
                sc->fonts_loaded |= FONT_16;
                /*
                 * FONT KLUDGE
                 * Always use the font page #0. XXX
                 * Don't load if the current font size is not 8x16.
                 */
                if (ISTEXTSC(sc->cur_scp) && (sc->cur_scp->font_size >= 16))
                        sc_load_font(
                            sc->cur_scp, 0, 16, 8, sc->font_16, 0, 256);
                return 0;

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

#endif /* SC_NO_FONT_LOADING */

        default:
                break;
        }

        return (ENOIOCTL);
}

static int
consolectl_ioctl(
    struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
{

        return sctty_ioctl(dev->si_drv1, cmd, data, td);
}

static int
consolectl_close(struct cdev *dev, int flags, int mode, struct thread *td)
{
#ifndef SC_NO_SYSMOUSE
        mouse_info_t info;
        memset(&info, 0, sizeof(info));
        info.operation = MOUSE_ACTION;

        /*
         * Make sure all buttons are released when moused and other
         * console daemons exit, so that no buttons are left pressed.
         */
        (void)sctty_ioctl(dev->si_drv1, CONS_MOUSECTL, (caddr_t)&info, td);
#endif
        return (0);
}

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

        if (!vty_enabled(VTY_SC)) {
                cp->cn_pri = CN_DEAD;
                return;
        }

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

        /* a video card is always required */
        if (!scvidprobe(unit, flags, TRUE))
                cp->cn_pri = CN_DEAD;

        /* syscons will become console even when there is no keyboard */
        sckbdprobe(unit, flags, TRUE);

        if (cp->cn_pri == CN_DEAD)
                return;

        /* initialize required fields */
        strcpy(cp->cn_name, "ttyv0");
}

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

        sc_get_cons_priority(&unit, &flags);
        scinit(unit, flags | SC_KERNEL_CONSOLE);
        sc_console_unit = unit;
        sc_console = sc_get_stat(sc_get_softc(unit, SC_KERNEL_CONSOLE)->dev[0]);
        sc_consptr = cp;
}

static void
sc_cnterm(struct consdev *cp)
{
        void *ts;
        int i;

        /* we are not the kernel console any more, release everything */

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

#if 0 /* XXX */
    sc_clear_screen(sc_console);
    sccnupdate(sc_console);
#endif

        if (sc_ktsw != NULL) {
                for (i = 0; i <= mp_maxid; i++) {
                        ts = sc_kts[i];
                        sc_kts[i] = NULL;
                        (*sc_ktsw->te_term)(sc_console, &ts);
                        free(ts, M_DEVBUF);
                }
                sc_ktsw = NULL;
        }
        scterm(sc_console_unit, SC_KERNEL_CONSOLE);
        sc_console_unit = -1;
        sc_console = NULL;
}

static void sccnclose(sc_softc_t *sc, struct sc_cnstate *sp);
static int sc_cngetc_locked(struct sc_cnstate *sp);
static void sccnkbdlock(sc_softc_t *sc, struct sc_cnstate *sp);
static void sccnkbdunlock(sc_softc_t *sc, struct sc_cnstate *sp);
static void sccnopen(sc_softc_t *sc, struct sc_cnstate *sp, int flags);
static void sccnscrlock(sc_softc_t *sc, struct sc_cnstate *sp);
static void sccnscrunlock(sc_softc_t *sc, struct sc_cnstate *sp);

static void
sccnkbdlock(sc_softc_t *sc, struct sc_cnstate *sp)
{
        /*
         * Locking method: hope for the best.
         * The keyboard is supposed to be Giant locked.  We can't handle that
         * in general.  The kdb_active case here is not safe, and we will
         * proceed without the lock in all cases.
         */
        sp->kbd_locked = !kdb_active && mtx_trylock(&Giant);
}

static void
sccnkbdunlock(sc_softc_t *sc, struct sc_cnstate *sp)
{
        if (sp->kbd_locked)
                mtx_unlock(&Giant);
        sp->kbd_locked = FALSE;
}

static void
sccnscrlock(sc_softc_t *sc, struct sc_cnstate *sp)
{
        int retries;

        /**
         * Locking method:
         * - if kdb_active and video_mtx is not owned by anyone, then lock
         *   by kdb remaining active
         * - if !kdb_active, try to acquire video_mtx without blocking or
         *   recursing; if we get it then it works normally.
         * Note that video_mtx is especially unusable if we already own it,
         * since then it is protecting something and syscons is not reentrant
         * enough to ignore the protection even in the kdb_active case.
         */
        if (kdb_active) {
                sp->kdb_locked = sc->video_mtx.mtx_lock == MTX_UNOWNED ||
                    SCHEDULER_STOPPED();
                sp->mtx_locked = FALSE;
        } else {
                sp->kdb_locked = FALSE;
                for (retries = 0; retries < 1000; retries++) {
                        sp->mtx_locked = mtx_trylock_spin_flags(
                                             &sc->video_mtx, MTX_QUIET) != 0;
                        if (SCHEDULER_STOPPED()) {
                                sp->kdb_locked = TRUE;
                                sp->mtx_locked = FALSE;
                                break;
                        }
                        if (sp->mtx_locked)
                                break;
                        DELAY(1);
                }
        }
}

static void
sccnscrunlock(sc_softc_t *sc, struct sc_cnstate *sp)
{
        if (sp->mtx_locked)
                mtx_unlock_spin(&sc->video_mtx);
        sp->mtx_locked = sp->kdb_locked = FALSE;
}

static void
sccnopen(sc_softc_t *sc, struct sc_cnstate *sp, int flags)
{
        int kbd_mode;

        /* assert(sc_console_unit >= 0) */

        sp->kbd_opened = FALSE;
        sp->scr_opened = FALSE;
        sp->kbd_locked = FALSE;

        /* Opening the keyboard is optional. */
        if (!(flags & 1) || sc->kbd == NULL)
                goto over_keyboard;

        sccnkbdlock(sc, sp);

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

        /* Switch the keyboard to console mode (K_XLATE, polled) on all scp's.
         */
        kbd_mode = K_XLATE;
        (void)kbdd_ioctl(sc->kbd, KDSKBMODE, (caddr_t)&kbd_mode);
        sc->kbd_open_level++;
        kbdd_poll(sc->kbd, TRUE);

        sp->kbd_opened = TRUE;
over_keyboard:;

        /* The screen is opened iff locking it succeeds. */
        sccnscrlock(sc, sp);
        if (!sp->kdb_locked && !sp->mtx_locked)
                return;
        sp->scr_opened = TRUE;

        /* The screen switch is optional. */
        if (!(flags & 2))
                return;

        /* try to switch to the kernel console screen */
        if (!cold && sc->cur_scp->index != sc_console->index &&
            sc->cur_scp->smode.mode == VT_AUTO &&
            sc_console->smode.mode == VT_AUTO)
                sc_switch_scr(sc, sc_console->index);
}

static void
sccnclose(sc_softc_t *sc, struct sc_cnstate *sp)
{
        sp->scr_opened = FALSE;
        sccnscrunlock(sc, sp);

        if (!sp->kbd_opened)
                return;

        /* Restore keyboard mode (for the current, possibly-changed scp). */
        kbdd_poll(sc->kbd, FALSE);
        if (--sc->kbd_open_level == 0)
                (void)kbdd_ioctl(
                    sc->kbd, KDSKBMODE, (caddr_t)&sc->cur_scp->kbd_mode);

        kbdd_disable(sc->kbd);
        sp->kbd_opened = FALSE;
        sccnkbdunlock(sc, sp);
}

/*
 * Grabbing switches the screen and keyboard focus to sc_console and the
 * keyboard mode to (K_XLATE, polled).  Only switching to polled mode is
 * essential (for preventing the interrupt handler from eating input
 * between polls).  Focus is part of the UI, and the other switches are
 * work just was well when they are done on every entry and exit.
 *
 * Screen switches while grabbed are supported, and to maintain focus for
 * this ungrabbing and closing only restore the polling state and then
 * the keyboard mode if on the original screen.
 */

static void
sc_cngrab(struct consdev *cp)
{
        sc_softc_t *sc;
        int lev;

        sc = sc_console->sc;
        lev = atomic_fetchadd_int(&sc->grab_level, 1);
        if (lev >= 0 && lev < 2) {
                sccnopen(sc, &sc->grab_state[lev], 1 | 2);
                sccnscrunlock(sc, &sc->grab_state[lev]);
                sccnkbdunlock(sc, &sc->grab_state[lev]);
        }
}

static void
sc_cnungrab(struct consdev *cp)
{
        sc_softc_t *sc;
        int lev;

        sc = sc_console->sc;
        lev = atomic_load_acq_int(&sc->grab_level) - 1;
        if (lev >= 0 && lev < 2) {
                sccnkbdlock(sc, &sc->grab_state[lev]);
                sccnscrlock(sc, &sc->grab_state[lev]);
                sccnclose(sc, &sc->grab_state[lev]);
        }
        atomic_add_int(&sc->grab_level, -1);
}

static char sc_cnputc_log[0x1000];
static u_int sc_cnputc_loghead;
static u_int sc_cnputc_logtail;

static void
sc_cnputc(struct consdev *cd, int c)
{
        struct sc_cnstate st;
        u_char buf[1];
        scr_stat *scp = sc_console;
        void *oldts, *ts;
        struct sc_term_sw *oldtsw;
#ifndef SC_NO_HISTORY
#if 0
    struct tty *tp;
#endif
#endif /* !SC_NO_HISTORY */
        u_int head;
        int s;

        /* assert(sc_console != NULL) */

        sccnopen(scp->sc, &st, 0);

        /*
         * Log the output.
         *
         * In the unlocked case, the logging is intentionally only
         * perfectly atomic for the indexes.
         */
        head = atomic_fetchadd_int(&sc_cnputc_loghead, 1);
        sc_cnputc_log[head % sizeof(sc_cnputc_log)] = c;

        /*
         * If we couldn't open, do special reentrant output and return to defer
         * normal output.
         */
        if (!st.scr_opened) {
                ec_putc(c);
                return;
        }

#ifndef SC_NO_HISTORY
        if (scp == scp->sc->cur_scp && scp->status & SLKED) {
                scp->status &= ~SLKED;
                update_kbd_state(scp, scp->status, SLKED);
                if (scp->status & BUFFER_SAVED) {
                        if (!sc_hist_restore(scp))
                                sc_remove_cutmarking(scp);
                        scp->status &= ~BUFFER_SAVED;
                        scp->status |= CURSOR_ENABLED;
                        sc_draw_cursor_image(scp);
                }
#if 0
        /*
         * XXX: Now that TTY's have their own locks, we cannot process
         * any data after disabling scroll lock. cnputs already holds a
         * spinlock.
         */
        tp = SC_DEV(scp->sc, scp->index);
        /* XXX "tp" can be NULL */
        tty_lock(tp);
        if (tty_opened(tp))
            sctty_outwakeup(tp);
        tty_unlock(tp);
#endif
        }
#endif /* !SC_NO_HISTORY */

        /* Play any output still in the log (our char may already be done). */
        while (sc_cnputc_logtail != atomic_load_acq_int(&sc_cnputc_loghead)) {
                buf[0] =
                    sc_cnputc_log[sc_cnputc_logtail++ % sizeof(sc_cnputc_log)];
                if (atomic_load_acq_int(&sc_cnputc_loghead) -
                        sc_cnputc_logtail >=
                    sizeof(sc_cnputc_log))
                        continue;
                /* Console output has a per-CPU "input" state.  Switch for it.
                 */
                ts = sc_kts[curcpu];
                if (ts != NULL) {
                        oldtsw = scp->tsw;
                        oldts = scp->ts;
                        scp->tsw = sc_ktsw;
                        scp->ts = ts;
                        (*scp->tsw->te_sync)(scp);
                } else {
                        /* Only 1 tsw early.  Switch only its attr. */
                        (*scp->tsw->te_default_attr)(
                            scp, sc_kattrtab[curcpu], SC_KERNEL_CONS_REV_ATTR);
                }
                sc_puts(scp, buf, 1);
                if (ts != NULL) {
                        scp->tsw = oldtsw;
                        scp->ts = oldts;
                        (*scp->tsw->te_sync)(scp);
                } else {
                        (*scp->tsw->te_default_attr)(
                            scp, SC_KERNEL_CONS_ATTR, SC_KERNEL_CONS_REV_ATTR);
                }
        }

        s = spltty(); /* block sckbdevent and scrn_timer */
        sccnupdate(scp);
        splx(s);
        sccnclose(scp->sc, &st);
}

static int
sc_cngetc(struct consdev *cd)
{
        struct sc_cnstate st;
        int c, s;

        /* assert(sc_console != NULL) */
        sccnopen(sc_console->sc, &st, 1);
        s = spltty(); /* block sckbdevent and scrn_timer while we poll */
        if (!st.kbd_opened) {
                splx(s);
                sccnclose(sc_console->sc, &st);
                return -1; /* means no keyboard since we fudged the locking */
        }
        c = sc_cngetc_locked(&st);
        splx(s);
        sccnclose(sc_console->sc, &st);
        return c;
}

static int
sc_cngetc_locked(struct sc_cnstate *sp)
{
        static struct fkeytab fkey;
        static int fkeycp;
        scr_stat *scp;
        const u_char *p;
        int c;

        /*
         * Stop the screen saver and update the screen if necessary.
         * What if we have been running in the screen saver code... XXX
         */
        if (sp->scr_opened)
                sc_touch_scrn_saver();
        scp = sc_console->sc->cur_scp; /* XXX */
        if (sp->scr_opened)
                sccnupdate(scp);

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

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

        switch (KEYFLAGS(c)) {
        case 0: /* normal char */
                return KEYCHAR(c);
        case FKEY: /* function key */
                p = (*scp->tsw->te_fkeystr)(scp, c);
                if (p != NULL) {
                        fkey.len = strlen(p);
                        bcopy(p, fkey.str, fkey.len);
                        fkeycp = 1;
                        return fkey.str[0];
                }
                p = kbdd_get_fkeystr(
                    scp->sc->kbd, KEYCHAR(c), (size_t *)&fkeycp);
                fkey.len = fkeycp;
                if ((p != NULL) && (fkey.len > 0)) {
                        bcopy(p, fkey.str, fkey.len);
                        fkeycp = 1;
                        return fkey.str[0];
                }
                return c; /* XXX */
        case NOKEY:
        case ERRKEY:
        default:
                return -1;
        }
        /* NOT REACHED */
}

static void
sccnupdate(scr_stat *scp)
{
        /* this is a cut-down version of scrn_timer()... */

        if (suspend_in_progress || scp->sc->font_loading_in_progress)
                return;

        if (kdb_active || KERNEL_PANICKED() || shutdown_in_progress) {
                sc_touch_scrn_saver();
        } else if (scp != scp->sc->cur_scp) {
                return;
        }

        if (!run_scrn_saver)
                scp->sc->flags &= ~SC_SCRN_IDLE;
#ifdef DEV_SPLASH
        if ((saver_mode != CONS_LKM_SAVER) || !(scp->sc->flags & SC_SCRN_IDLE))
                if (scp->sc->flags & SC_SCRN_BLANKED)
                        stop_scrn_saver(scp->sc, current_saver);
#endif

        if (scp != scp->sc->cur_scp || scp->sc->blink_in_progress ||
            scp->sc->switch_in_progress)
                return;
        /*
         * FIXME: unlike scrn_timer(), we call scrn_update() from here even
         * when write_in_progress is non-zero.  XXX
         */

        if (!ISGRAPHSC(scp) && !(scp->sc->flags & SC_SCRN_BLANKED))
                scrn_update(scp, TRUE);
}

static void
scrn_timer(void *arg)
{
        static time_t kbd_time_stamp = 0;
        sc_softc_t *sc;
        scr_stat *scp;
        int again, rate;
        int kbdidx;

        again = (arg != NULL);
        if (arg != NULL)
                sc = (sc_softc_t *)arg;
        else if (sc_console != NULL)
                sc = sc_console->sc;
        else
                return;

        /* find the vty to update */
        scp = sc->cur_scp;

        /* don't do anything when we are performing some I/O operations */
        if (suspend_in_progress || sc->font_loading_in_progress)
                goto done;

        if ((sc->kbd == NULL) && (sc->config & SC_AUTODETECT_KBD)) {
                /* try to allocate a keyboard automatically */
                if (kbd_time_stamp != time_uptime) {
                        kbd_time_stamp = time_uptime;
                        kbdidx = sc_allocate_keyboard(sc, -1);
                        if (kbdidx >= 0) {
                                sc->kbd = kbd_get_keyboard(kbdidx);
                                (void)kbdd_ioctl(sc->kbd, KDSKBMODE,
                                    (caddr_t)&sc->cur_scp->kbd_mode);
                                update_kbd_state(sc->cur_scp,
                                    sc->cur_scp->status, LOCK_MASK);
                        }
                }
        }

        /* should we stop the screen saver? */
        if (kdb_active || KERNEL_PANICKED() || shutdown_in_progress)
                sc_touch_scrn_saver();
        if (run_scrn_saver) {
                if (time_uptime > sc->scrn_time_stamp + scrn_blank_time)
                        sc->flags |= SC_SCRN_IDLE;
                else
                        sc->flags &= ~SC_SCRN_IDLE;
        } else {
                sc->scrn_time_stamp = time_uptime;
                sc->flags &= ~SC_SCRN_IDLE;
                if (scrn_blank_time > 0)
                        run_scrn_saver = TRUE;
        }
#ifdef DEV_SPLASH
        if ((saver_mode != CONS_LKM_SAVER) || !(sc->flags & SC_SCRN_IDLE))
                if (sc->flags & SC_SCRN_BLANKED)
                        stop_scrn_saver(sc, current_saver);
#endif

        /* should we just return ? */
        if (sc->blink_in_progress || sc->switch_in_progress ||
            sc->write_in_progress)
                goto done;

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

#ifdef DEV_SPLASH
        /* should we activate the screen saver? */
        if ((saver_mode == CONS_LKM_SAVER) && (sc->flags & SC_SCRN_IDLE))
                if (!ISGRAPHSC(scp) || (sc->flags & SC_SCRN_BLANKED))
                        (*current_saver)(sc, TRUE);
#endif

done:
        if (again) {
                /*
                 * Use reduced "refresh" rate if we are in graphics and that is
                 * not a graphical screen saver.  In such case we just have
                 * nothing to do.
                 */
                if (ISGRAPHSC(scp) && !(sc->flags & SC_SCRN_BLANKED))
                        rate = 2;
                else
                        rate = 30;
                callout_reset_sbt(
                    &sc->ctimeout, SBT_1S / rate, 0, scrn_timer, sc, C_PREL(1));
        }
}

static int
and_region(int *s1, int *e1, int s2, int e2)
{
        if (*e1 < s2 || e2 < *s1)
                return FALSE;
        *s1 = imax(*s1, s2);
        *e1 = imin(*e1, e2);
        return TRUE;
}

static void
scrn_update(scr_stat *scp, int show_cursor)
{
        int start;
        int end;
        int s;
        int e;

        /* assert(scp == scp->sc->cur_scp) */

        SC_VIDEO_LOCK(scp->sc);

#ifndef SC_NO_CUTPASTE
        /* remove the previous mouse pointer image if necessary */
        if (scp->status & MOUSE_VISIBLE) {
                s = scp->mouse_pos;
                e = scp->mouse_pos + scp->xsize + 1;
                if ((scp->status & (MOUSE_MOVED | MOUSE_HIDDEN)) ||
                    and_region(&s, &e, scp->start, scp->end) ||
                    ((scp->status & CURSOR_ENABLED) &&
                        (scp->cursor_pos != scp->cursor_oldpos) &&
                        (and_region(&s, &e, scp->cursor_pos, scp->cursor_pos) ||
                            and_region(&s, &e, scp->cursor_oldpos,
                                scp->cursor_oldpos)))) {
                        sc_remove_mouse_image(scp);
                        if (scp->end >= scp->xsize * scp->ysize)
                                scp->end = scp->xsize * scp->ysize - 1;
                }
        }
#endif /* !SC_NO_CUTPASTE */

#if 1
        /* debug: XXX */
        if (scp->end >= scp->xsize * scp->ysize) {
                printf("scrn_update(): scp->end %d > size_of_screen!!\n",
                    scp->end);
                scp->end = scp->xsize * scp->ysize - 1;
        }
        if (scp->start < 0) {
                printf("scrn_update(): scp->start %d < 0\n", scp->start);
                scp->start = 0;
        }
#endif

        /* update screen image */
        if (scp->start <= scp->end) {
                if (scp->mouse_cut_end >= 0) {
                        /* there is a marked region for cut & paste */
                        if (scp->mouse_cut_start <= scp->mouse_cut_end) {
                                start = scp->mouse_cut_start;
                                end = scp->mouse_cut_end;
                        } else {
                                start = scp->mouse_cut_end;
                                end = scp->mouse_cut_start - 1;
                        }
                        s = start;
                        e = end;
                        /* does the cut-mark region overlap with the update
                         * region? */
                        if (and_region(&s, &e, scp->start, scp->end)) {
                                (*scp->rndr->draw)(scp, s, e - s + 1, TRUE);
                                s = 0;
                                e = start - 1;
                                if (and_region(&s, &e, scp->start, scp->end))
                                        (*scp->rndr->draw)(
                                            scp, s, e - s + 1, FALSE);
                                s = end + 1;
                                e = scp->xsize * scp->ysize - 1;
                                if (and_region(&s, &e, scp->start, scp->end))
                                        (*scp->rndr->draw)(
                                            scp, s, e - s + 1, FALSE);
                        } else {
                                (*scp->rndr->draw)(scp, scp->start,
                                    scp->end - scp->start + 1, FALSE);
                        }
                } else {
                        (*scp->rndr->draw)(
                            scp, scp->start, scp->end - scp->start + 1, FALSE);
                }
        }

        /* we are not to show the cursor and the mouse pointer... */
        if (!show_cursor) {
                scp->end = 0;
                scp->start = scp->xsize * scp->ysize - 1;
                SC_VIDEO_UNLOCK(scp->sc);
                return;
        }

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

#ifndef SC_NO_CUTPASTE
        /* update "pseudo" mouse pointer image */
        if (scp->sc->flags & SC_MOUSE_ENABLED) {
                if (!(scp->status & (MOUSE_VISIBLE | MOUSE_HIDDEN))) {
                        scp->status &= ~MOUSE_MOVED;
                        sc_draw_mouse_image(scp);
                }
        }
#endif /* SC_NO_CUTPASTE */

        scp->end = 0;
        scp->start = scp->xsize * scp->ysize - 1;

        SC_VIDEO_UNLOCK(scp->sc);
}

#ifdef DEV_SPLASH
static int
scsplash_callback(int event, void *arg)
{
        sc_softc_t *sc;
        int error;

        sc = (sc_softc_t *)arg;

        switch (event) {
        case SPLASH_INIT:
                if (add_scrn_saver(scsplash_saver) == 0) {
                        sc->flags &= ~SC_SAVER_FAILED;
                        run_scrn_saver = TRUE;
                        if (cold && !(boothowto & RB_VERBOSE)) {
                                scsplash_stick(TRUE);
                                (*current_saver)(sc, TRUE);
                        }
                }
                return 0;

        case SPLASH_TERM:
                if (current_saver == scsplash_saver) {
                        scsplash_stick(FALSE);
                        error = remove_scrn_saver(scsplash_saver);
                        if (error)
                                return error;
                }
                return 0;

        default:
                return EINVAL;
        }
}

static void
scsplash_saver(sc_softc_t *sc, int show)
{
        static int busy = FALSE;
        scr_stat *scp;

        if (busy)
                return;
        busy = TRUE;

        scp = sc->cur_scp;
        if (show) {
                if (!(sc->flags & SC_SAVER_FAILED)) {
                        if (!(sc->flags & SC_SCRN_BLANKED))
                                set_scrn_saver_mode(scp, -1, NULL, 0);
                        switch (splash(sc->adp, TRUE)) {
                        case 0: /* succeeded */
                                break;
                        case EAGAIN: /* try later */
                                restore_scrn_saver_mode(scp, FALSE);
                                sc_touch_scrn_saver(); /* XXX */
                                break;
                        default:
                                sc->flags |= SC_SAVER_FAILED;
                                scsplash_stick(FALSE);
                                restore_scrn_saver_mode(scp, TRUE);
                                printf(
                                    "scsplash_saver(): failed to put up the image\n");
                                break;
                        }
                }
        } else if (!sticky_splash) {
                if ((sc->flags & SC_SCRN_BLANKED) &&
                    (splash(sc->adp, FALSE) == 0))
                        restore_scrn_saver_mode(scp, TRUE);
        }
        busy = FALSE;
}

static int
add_scrn_saver(void (*this_saver)(sc_softc_t *, int))
{
#if 0
    int error;

    if (current_saver != none_saver) {
        error = remove_scrn_saver(current_saver);
        if (error)
            return error;
    }
#endif
        if (current_saver != none_saver)
                return EBUSY;

        run_scrn_saver = FALSE;
        saver_mode = CONS_LKM_SAVER;
        current_saver = this_saver;
        return 0;
}

static int
remove_scrn_saver(void (*this_saver)(sc_softc_t *, int))
{
        if (current_saver != this_saver)
                return EINVAL;

#if 0
    /*
     * In order to prevent `current_saver' from being called by
     * the timeout routine `scrn_timer()' while we manipulate 
     * the saver list, we shall set `current_saver' to `none_saver' 
     * before stopping the current saver, rather than blocking by `splXX()'.
     */
    current_saver = none_saver;
    if (scrn_blanked)
        stop_scrn_saver(this_saver);
#endif

        /* unblank all blanked screens */
        wait_scrn_saver_stop(NULL);
        if (scrn_blanked)
                return EBUSY;

        current_saver = none_saver;
        return 0;
}

static int
set_scrn_saver_mode(scr_stat *scp, int mode, u_char *pal, int border)
{
        int s;

        /* assert(scp == scp->sc->cur_scp) */
        s = spltty();
        if (!ISGRAPHSC(scp))
                sc_remove_cursor_image(scp);
        scp->splash_save_mode = scp->mode;
        scp->splash_save_status = scp->status & (GRAPHICS_MODE | PIXEL_MODE);
        scp->status &= ~(GRAPHICS_MODE | PIXEL_MODE);
        scp->status |= (UNKNOWN_MODE | SAVER_RUNNING);
        scp->sc->flags |= SC_SCRN_BLANKED;
        ++scrn_blanked;
        splx(s);
        if (mode < 0)
                return 0;
        scp->mode = mode;
        if (set_mode(scp) == 0) {
                if (scp->sc->adp->va_info.vi_flags & V_INFO_GRAPHICS)
                        scp->status |= GRAPHICS_MODE;
#ifndef SC_NO_PALETTE_LOADING
                if (pal != NULL)
                        vidd_load_palette(scp->sc->adp, pal);
#endif
                sc_set_border(scp, border);
                return 0;
        } else {
                s = spltty();
                scp->mode = scp->splash_save_mode;
                scp->status &= ~(UNKNOWN_MODE | SAVER_RUNNING);
                scp->status |= scp->splash_save_status;
                splx(s);
                return 1;
        }
}

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

        /* assert(scp == scp->sc->cur_scp) */
        s = spltty();
        mode = scp->mode;
        status = scp->status;
        scp->mode = scp->splash_save_mode;
        scp->status &= ~(UNKNOWN_MODE | SAVER_RUNNING);
        scp->status |= scp->splash_save_status;
        scp->sc->flags &= ~SC_SCRN_BLANKED;
        if (!changemode) {
                if (!ISGRAPHSC(scp))
                        sc_draw_cursor_image(scp);
                --scrn_blanked;
                splx(s);
                return 0;
        }
        if (set_mode(scp) == 0) {
#ifndef SC_NO_PALETTE_LOADING
#ifdef SC_PIXEL_MODE
                if (scp->sc->adp->va_info.vi_mem_model == V_INFO_MM_DIRECT)
                        vidd_load_palette(scp->sc->adp, scp->sc->palette2);
                else
#endif
                        vidd_load_palette(scp->sc->adp, scp->sc->palette);
#endif
                --scrn_blanked;
                splx(s);
                return 0;
        } else {
                scp->mode = mode;
                scp->status = status;
                splx(s);
                return 1;
        }
}

static void
stop_scrn_saver(sc_softc_t *sc, void (*saver)(sc_softc_t *, int))
{
        (*saver)(sc, FALSE);
        run_scrn_saver = FALSE;
        /* the screen saver may have chosen not to stop after all... */
        if (sc->flags & SC_SCRN_BLANKED)
                return;

        mark_all(sc->cur_scp);
        if (sc->delayed_next_scr)
                sc_switch_scr(sc, sc->delayed_next_scr - 1);
        if (!kdb_active)
                wakeup(&scrn_blanked);
}

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

        while (scrn_blanked > 0) {
                run_scrn_saver = FALSE;
                if (sc && !(sc->flags & SC_SCRN_BLANKED)) {
                        error = 0;
                        break;
                }
                error = tsleep(&scrn_blanked, PZERO | PCATCH, "scrsav", 0);
                if ((error != 0) && (error != ERESTART))
                        break;
        }
        run_scrn_saver = FALSE;
        return error;
}
#endif /* DEV_SPLASH */

void
sc_touch_scrn_saver(void)
{
        scsplash_stick(FALSE);
        run_scrn_saver = FALSE;
}

int
sc_switch_scr(sc_softc_t *sc, u_int next_scr)
{
        scr_stat *cur_scp;
        struct tty *tp;
        struct proc *p;
        int s;

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

        if (sc->cur_scp == NULL)
                return (0);

        /* prevent switch if previously requested */
        if (sc->flags & SC_SCRN_VTYLOCK) {
                sc_bell(sc->cur_scp, sc->cur_scp->bell_pitch,
                    sc->cur_scp->bell_duration);
                return EPERM;
        }

        /* delay switch if the screen is blanked or being updated */
        if ((sc->flags & SC_SCRN_BLANKED) || sc->write_in_progress ||
            sc->blink_in_progress) {
                sc->delayed_next_scr = next_scr + 1;
                sc_touch_scrn_saver();
                DPRINTF(5, ("switch delayed\n"));
                return 0;
        }
        sc->delayed_next_scr = 0;

        s = spltty();
        cur_scp = sc->cur_scp;

        /* we are in the middle of the vty switching process... */
        if (sc->switch_in_progress && (cur_scp->smode.mode == VT_PROCESS) &&
            cur_scp->proc) {
                p = pfind(cur_scp->pid);
                if (cur_scp->proc != p) {
                        if (p)
                                PROC_UNLOCK(p);
                        /*
                         * The controlling process has died!!.  Do some clean
                         * up. NOTE:`cur_scp->proc' and `cur_scp->smode.mode'
                         * are not reset here yet; they will be cleared later.
                         */
                        DPRINTF(5,
                            ("cur_scp controlling process %d died, ",
                                cur_scp->pid));
                        if (cur_scp->status & SWITCH_WAIT_REL) {
                                /*
                                 * Force the previous switch to finish, but
                                 * return now with error.
                                 */
                                DPRINTF(5, ("reset WAIT_REL, "));
                                finish_vt_rel(cur_scp, TRUE, &s);
                                splx(s);
                                DPRINTF(5, ("finishing previous switch\n"));
                                return EINVAL;
                        } else if (cur_scp->status & SWITCH_WAIT_ACQ) {
                                /* let's assume screen switch has been
                                 * completed. */
                                DPRINTF(5, ("reset WAIT_ACQ, "));
                                finish_vt_acq(cur_scp);
                        } else {
                                /*
                                 * We are in between screen release and
                                 * acquisition, and reached here via scgetc() or
                                 * scrn_timer() which has interrupted
                                 * exchange_scr(). Don't do anything stupid.
                                 */
                                DPRINTF(5, ("waiting nothing, "));
                        }
                } else {
                        if (p)
                                PROC_UNLOCK(p);
                        /*
                         * The controlling process is alive, but not
                         * responding... It is either buggy or it may be just
                         * taking time. The following code is a gross kludge to
                         * cope with this problem for which there is no clean
                         * solution. XXX
                         */
                        if (cur_scp->status & SWITCH_WAIT_REL) {
                                switch (sc->switch_in_progress++) {
                                case 1:
                                        break;
                                case 2:
                                        DPRINTF(5, ("sending relsig again, "));
                                        signal_vt_rel(cur_scp);
                                        break;
                                case 3:
                                        break;
                                case 4:
                                default:
                                        /*
                                         * Act as if the controlling program
                                         * returned VT_FALSE.
                                         */
                                        DPRINTF(5, ("force reset WAIT_REL, "));
                                        finish_vt_rel(cur_scp, FALSE, &s);
                                        splx(s);
                                        DPRINTF(5,
                                            ("act as if VT_FALSE was seen\n"));
                                        return EINVAL;
                                }
                        } else if (cur_scp->status & SWITCH_WAIT_ACQ) {
                                switch (sc->switch_in_progress++) {
                                case 1:
                                        break;
                                case 2:
                                        DPRINTF(5, ("sending acqsig again, "));
                                        signal_vt_acq(cur_scp);
                                        break;
                                case 3:
                                        break;
                                case 4:
                                default:
                                        /* clear the flag and finish the
                                         * previous switch */
                                        DPRINTF(5, ("force reset WAIT_ACQ, "));
                                        finish_vt_acq(cur_scp);
                                        break;
                                }
                        }
                }
        }

        /*
         * Return error if an invalid argument is given, or vty switch
         * is still in progress.
         */
        if ((next_scr < sc->first_vty) ||
            (next_scr >= sc->first_vty + sc->vtys) || sc->switch_in_progress) {
                splx(s);
                sc_bell(cur_scp, bios_value.bell_pitch, BELL_DURATION);
                DPRINTF(5, ("error 1\n"));
                return EINVAL;
        }

        /*
         * Don't allow switching away from the graphics mode vty
         * if the switch mode is VT_AUTO, unless the next vty is the same
         * as the current or the current vty has been closed (but showing).
         */
        tp = SC_DEV(sc, cur_scp->index);
        if ((cur_scp->index != next_scr) && tty_opened_ns(tp) &&
            (cur_scp->smode.mode == VT_AUTO) && ISGRAPHSC(cur_scp)) {
                splx(s);
                sc_bell(cur_scp, bios_value.bell_pitch, BELL_DURATION);
                DPRINTF(5, ("error, graphics mode\n"));
                return EINVAL;
        }

        /*
         * Is the wanted vty open? Don't allow switching to a closed vty.
         * If we are in DDB, don't switch to a vty in the VT_PROCESS mode.
         * Note that we always allow the user to switch to the kernel
         * console even if it is closed.
         */
        if ((sc_console == NULL) || (next_scr != sc_console->index)) {
                tp = SC_DEV(sc, next_scr);
                if (!tty_opened_ns(tp)) {
                        splx(s);
                        sc_bell(cur_scp, bios_value.bell_pitch, BELL_DURATION);
                        DPRINTF(5, ("error 2, requested vty isn't open!\n"));
                        return EINVAL;
                }
                if (kdb_active && SC_STAT(tp)->smode.mode == VT_PROCESS) {
                        splx(s);
                        DPRINTF(5,
                            ("error 3, requested vty is in the VT_PROCESS mode\n"));
                        return EINVAL;
                }
        }

        /* this is the start of vty switching process... */
        ++sc->switch_in_progress;
        sc->old_scp = cur_scp;
        sc->new_scp = sc_get_stat(SC_DEV(sc, next_scr));
        if (sc->new_scp == sc->old_scp) {
                sc->switch_in_progress = 0;
                /*
                 * XXX wakeup() locks the scheduler lock which will hang if
                 * the lock is in an in-between state, e.g., when we stop at
                 * a breakpoint at fork_exit.  It has always been wrong to call
                 * wakeup() when the debugger is active.  In RELENG_4, wakeup()
                 * is supposed to be locked by splhigh(), but the debugger may
                 * be invoked at splhigh().
                 */
                if (!kdb_active)
                        wakeup(VTY_WCHAN(sc, next_scr));
                splx(s);
                DPRINTF(5, ("switch done (new == old)\n"));
                return 0;
        }

        /* has controlling process died? */
        vt_proc_alive(sc->old_scp);
        vt_proc_alive(sc->new_scp);

        /* wait for the controlling process to release the screen, if necessary
         */
        if (signal_vt_rel(sc->old_scp)) {
                splx(s);
                return 0;
        }

        /* go set up the new vty screen */
        splx(s);
        exchange_scr(sc);
        s = spltty();

        /* wake up processes waiting for this vty */
        if (!kdb_active)
                wakeup(VTY_WCHAN(sc, next_scr));

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

        sc->switch_in_progress = 0;
        if (sc->unit == sc_console_unit)
                cnavailable(sc_consptr, TRUE);
        splx(s);
        DPRINTF(5, ("switch done\n"));

        return 0;
}

static int
do_switch_scr(sc_softc_t *sc, int s)
{
        vt_proc_alive(sc->new_scp);

        splx(s);
        exchange_scr(sc);
        s = spltty();
        /* sc->cur_scp == sc->new_scp */
        wakeup(VTY_WCHAN(sc, sc->cur_scp->index));

        /* wait for the controlling process to acknowledge, if necessary */
        if (!signal_vt_acq(sc->cur_scp)) {
                sc->switch_in_progress = 0;
                if (sc->unit == sc_console_unit)
                        cnavailable(sc_consptr, TRUE);
        }

        return s;
}

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

        if (scp->proc) {
                if ((p = pfind(scp->pid)) != NULL)
                        PROC_UNLOCK(p);
                if (scp->proc == p)
                        return TRUE;
                scp->proc = NULL;
                scp->smode.mode = VT_AUTO;
                DPRINTF(5, ("vt controlling process %d died\n", scp->pid));
        }
        return FALSE;
}

static int
signal_vt_rel(scr_stat *scp)
{
        if (scp->smode.mode != VT_PROCESS)
                return FALSE;
        scp->status |= SWITCH_WAIT_REL;
        PROC_LOCK(scp->proc);
        kern_psignal(scp->proc, scp->smode.relsig);
        PROC_UNLOCK(scp->proc);
        DPRINTF(5, ("sending relsig to %d\n", scp->pid));
        return TRUE;
}

static int
signal_vt_acq(scr_stat *scp)
{
        if (scp->smode.mode != VT_PROCESS)
                return FALSE;
        if (scp->sc->unit == sc_console_unit)
                cnavailable(sc_consptr, FALSE);
        scp->status |= SWITCH_WAIT_ACQ;
        PROC_LOCK(scp->proc);
        kern_psignal(scp->proc, scp->smode.acqsig);
        PROC_UNLOCK(scp->proc);
        DPRINTF(5, ("sending acqsig to %d\n", scp->pid));
        return TRUE;
}

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

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

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

        /* save the current state of video and keyboard */
        sc_move_cursor(sc->old_scp, sc->old_scp->xpos, sc->old_scp->ypos);
        if (!ISGRAPHSC(sc->old_scp))
                sc_remove_cursor_image(sc->old_scp);
        if (sc->old_scp->kbd_mode == K_XLATE)
                save_kbd_state(sc->old_scp);

        /* set up the video for the new screen */
        scp = sc->cur_scp = sc->new_scp;
        if (sc->old_scp->mode != scp->mode || ISUNKNOWNSC(sc->old_scp))
                set_mode(scp);
        else
                sc_vtb_init(&scp->scr, VTB_FRAMEBUFFER, scp->xsize, scp->ysize,
                    (void *)sc->adp->va_window, FALSE);
        scp->status |= MOUSE_HIDDEN;
        sc_move_cursor(scp, scp->xpos, scp->ypos);
        if (!ISGRAPHSC(scp))
                sc_set_cursor_image(scp);
#ifndef SC_NO_PALETTE_LOADING
        if (ISGRAPHSC(sc->old_scp)) {
#ifdef SC_PIXEL_MODE
                if (sc->adp->va_info.vi_mem_model == V_INFO_MM_DIRECT)
                        vidd_load_palette(sc->adp, sc->palette2);
                else
#endif
                        vidd_load_palette(sc->adp, sc->palette);
        }
#endif
        sc_set_border(scp, scp->border);

        /* set up the keyboard for the new screen */
        if (sc->kbd_open_level == 0 && sc->old_scp->kbd_mode != scp->kbd_mode)
                (void)kbdd_ioctl(sc->kbd, KDSKBMODE, (caddr_t)&scp->kbd_mode);
        update_kbd_state(scp, scp->status, LOCK_MASK);

        mark_all(scp);
}

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

        if (scp->tsw)
                (*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); */
        SC_VIDEO_LOCK(scp->sc);
        (*scp->rndr->draw_cursor)(scp, scp->cursor_pos,
            scp->curs_attr.flags & CONS_BLINK_CURSOR, TRUE,
            sc_inside_cutmark(scp, scp->cursor_pos));
        scp->cursor_oldpos = scp->cursor_pos;
        SC_VIDEO_UNLOCK(scp->sc);
}

void
sc_remove_cursor_image(scr_stat *scp)
{
        /* assert(scp == scp->sc->cur_scp); */
        SC_VIDEO_LOCK(scp->sc);
        (*scp->rndr->draw_cursor)(scp, scp->cursor_oldpos,
            scp->curs_attr.flags & CONS_BLINK_CURSOR, FALSE,
            sc_inside_cutmark(scp, scp->cursor_oldpos));
        SC_VIDEO_UNLOCK(scp->sc);
}

static void
update_cursor_image(scr_stat *scp)
{
        /* assert(scp == scp->sc->cur_scp); */
        sc_remove_cursor_image(scp);
        sc_set_cursor_image(scp);
        sc_draw_cursor_image(scp);
}

void
sc_set_cursor_image(scr_stat *scp)
{
        scp->curs_attr = scp->base_curs_attr;
        if (scp->curs_attr.flags & CONS_HIDDEN_CURSOR) {
                /* hidden cursor is internally represented as zero-height
                 * underline */
                scp->curs_attr.flags = CONS_CHAR_CURSOR;
                scp->curs_attr.base = scp->curs_attr.height = 0;
        } else if (scp->curs_attr.flags & CONS_CHAR_CURSOR) {
                scp->curs_attr.base =
                    imin(scp->base_curs_attr.base, scp->font_size - 1);
                scp->curs_attr.height = imin(scp->base_curs_attr.height,
                    scp->font_size - scp->curs_attr.base);
        } else { /* block cursor */
                scp->curs_attr.base = 0;
                scp->curs_attr.height = scp->font_size;
        }

        /* assert(scp == scp->sc->cur_scp); */
        SC_VIDEO_LOCK(scp->sc);
        (*scp->rndr->set_cursor)(scp, scp->curs_attr.base,
            scp->curs_attr.height, scp->curs_attr.flags & CONS_BLINK_CURSOR);
        SC_VIDEO_UNLOCK(scp->sc);
}

static void
sc_adjust_ca(struct cursor_attr *cap, int flags, int base, int height)
{
        if (flags & CONS_CHARCURSOR_COLORS) {
                cap->bg[0] = base & 0xff;
                cap->bg[1] = height & 0xff;
        } else if (flags & CONS_MOUSECURSOR_COLORS) {
                cap->mouse_ba = base & 0xff;
                cap->mouse_ia = height & 0xff;
        } else {
                if (base >= 0)
                        cap->base = base;
                if (height >= 0)
                        cap->height = height;
                if (!(flags & CONS_SHAPEONLY_CURSOR))
                        cap->flags = flags & CONS_CURSOR_ATTRS;
        }
}

static void
change_cursor_shape(scr_stat *scp, int flags, int base, int height)
{
        if ((scp == scp->sc->cur_scp) && !ISGRAPHSC(scp))
                sc_remove_cursor_image(scp);

        if (flags & CONS_RESET_CURSOR)
                scp->base_curs_attr = scp->dflt_curs_attr;
        else if (flags & CONS_DEFAULT_CURSOR) {
                sc_adjust_ca(&scp->dflt_curs_attr, flags, base, height);
                scp->base_curs_attr = scp->dflt_curs_attr;
        } else
                sc_adjust_ca(&scp->base_curs_attr, flags, base, height);

        if ((scp == scp->sc->cur_scp) && !ISGRAPHSC(scp)) {
                sc_set_cursor_image(scp);
                sc_draw_cursor_image(scp);
        }
}

void
sc_change_cursor_shape(scr_stat *scp, int flags, int base, int height)
{
        sc_softc_t *sc;
        struct tty *tp;
        int s;
        int i;

        if (flags == -1)
                flags = CONS_SHAPEONLY_CURSOR;

        s = spltty();
        if (flags & CONS_LOCAL_CURSOR) {
                /* local (per vty) change */
                change_cursor_shape(scp, flags, base, height);
                splx(s);
                return;
        }

        /* global change */
        sc = scp->sc;
        if (flags & CONS_RESET_CURSOR)
                sc->curs_attr = sc->dflt_curs_attr;
        else if (flags & CONS_DEFAULT_CURSOR) {
                sc_adjust_ca(&sc->dflt_curs_attr, flags, base, height);
                sc->curs_attr = sc->dflt_curs_attr;
        } else
                sc_adjust_ca(&sc->curs_attr, flags, base, height);

        for (i = sc->first_vty; i < sc->first_vty + sc->vtys; ++i) {
                if ((tp = SC_DEV(sc, i)) == NULL)
                        continue;
                if ((scp = sc_get_stat(tp)) == NULL)
                        continue;
                scp->dflt_curs_attr = sc->curs_attr;
                change_cursor_shape(scp, CONS_RESET_CURSOR, -1, -1);
        }
        splx(s);
}

static void
scinit(int unit, int flags)
{

        /*
         * When syscons is being initialized as the kernel console, malloc()
         * is not yet functional, because various kernel structures has not been
         * fully initialized yet.  Therefore, we need to declare the following
         * static buffers for the console.  This is less than ideal,
         * but is necessry evil for the time being.  XXX
         */
        static u_short sc_buffer[ROW * 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

#ifdef SC_KERNEL_CONS_ATTRS
        static const u_char dflt_kattrtab[] = SC_KERNEL_CONS_ATTRS;
#elif SC_KERNEL_CONS_ATTR == FG_WHITE
        static const u_char dflt_kattrtab[] = {
                FG_WHITE,
                FG_YELLOW,
                FG_LIGHTMAGENTA,
                FG_LIGHTRED,
                FG_LIGHTCYAN,
                FG_LIGHTGREEN,
                FG_LIGHTBLUE,
                FG_GREEN,
                0,
        };
#else
        static const u_char dflt_kattrtab[] = {
                FG_WHITE,
                0,
        };
#endif
        sc_softc_t *sc;
        scr_stat *scp;
        video_adapter_t *adp;
        int col;
        int kbdidx;
        int row;
        int i;

        /* one time initialization */
        if (init_done == COLD) {
                sc_get_bios_values(&bios_value);
                for (i = 0; i < nitems(sc_kattrtab); i++)
                        sc_kattrtab[i] =
                            dflt_kattrtab[i % (nitems(dflt_kattrtab) - 1)];
        }
        init_done = WARM;

        /*
         * Allocate resources.  Even if we are being called for the second
         * time, we must allocate them again, because they might have
         * disappeared...
         */
        sc = sc_get_softc(unit, flags & SC_KERNEL_CONSOLE);
        if ((sc->flags & SC_INIT_DONE) == 0)
                SC_VIDEO_LOCKINIT(sc);

        adp = NULL;
        if (sc->adapter >= 0) {
                vid_release(sc->adp, (void *)&sc->adapter);
                adp = sc->adp;
                sc->adp = NULL;
        }
        if (sc->kbd != NULL) {
                DPRINTF(5, ("sc%d: releasing kbd%d\n", unit,
                    sc->kbd->kb_index));
                i = kbd_release(sc->kbd, (void *)&sc->kbd);
                DPRINTF(5, ("sc%d: kbd_release returned %d\n", unit, i));
                if (sc->kbd != NULL) {
                        DPRINTF(5,
                            ("sc%d: kbd != NULL!, index:%d, unit:%d, flags:0x%x\n",
                                unit, sc->kbd->kb_index, sc->kbd->kb_unit,
                                sc->kbd->kb_flags));
                }
                sc->kbd = NULL;
        }
        sc->adapter = vid_allocate("*", unit, (void *)&sc->adapter);
        sc->adp = vid_get_adapter(sc->adapter);
        /* assert((sc->adapter >= 0) && (sc->adp != NULL)) */

        kbdidx = sc_allocate_keyboard(sc, unit);
        DPRINTF(1, ("sc%d: keyboard %d\n", unit, kbdidx));

        sc->kbd = kbd_get_keyboard(kbdidx);
        if (sc->kbd != NULL) {
                DPRINTF(1,
                    ("sc%d: kbd index:%d, unit:%d, flags:0x%x\n", unit,
                        sc->kbd->kb_index, sc->kbd->kb_unit,
                        sc->kbd->kb_flags));
        }

        if (!(sc->flags & SC_INIT_DONE) || (adp != sc->adp)) {
                sc->initial_mode = sc->adp->va_initial_mode;

#ifndef SC_NO_FONT_LOADING
                if (flags & SC_KERNEL_CONSOLE) {
                        sc->font_8 = font_8;
                        sc->font_14 = font_14;
                        sc->font_16 = font_16;
                } else if (sc->font_8 == NULL) {
                        /* assert(sc_malloc) */
                        sc->font_8 = malloc(sizeof(font_8), M_DEVBUF, M_WAITOK);
                        sc->font_14 =
                            malloc(sizeof(font_14), M_DEVBUF, M_WAITOK);
                        sc->font_16 =
                            malloc(sizeof(font_16), M_DEVBUF, M_WAITOK);
                }
#endif

                /* extract the hardware cursor location and hide the cursor for
                 * now */
                vidd_read_hw_cursor(sc->adp, &col, &row);
                vidd_set_hw_cursor(sc->adp, -1, -1);

                /* set up the first console */
                sc->first_vty = unit * MAXCONS;
                sc->vtys = MAXCONS; /* XXX: should be configurable */
                if (flags & SC_KERNEL_CONSOLE) {
                        /*
                         * Set up devs structure but don't use it yet, calling
                         * make_dev() might panic kernel.  Wait for
                         * sc_attach_unit() to actually create the devices.
                         */
                        sc->dev = main_devs;
                        scp = &main_console;
                        init_scp(sc, sc->first_vty, scp);
                        sc_vtb_init(&scp->vtb, VTB_MEMORY, scp->xsize,
                            scp->ysize, (void *)sc_buffer, FALSE);
                        if (sc_init_emulator(scp, SC_DFLT_TERM))
                                sc_init_emulator(scp, "*");
                        (*scp->tsw->te_default_attr)(
                            scp, SC_KERNEL_CONS_ATTR, SC_KERNEL_CONS_REV_ATTR);
                } else {
                        /* assert(sc_malloc) */
                        sc->dev = malloc(sizeof(struct tty *) * sc->vtys,
                            M_DEVBUF, M_WAITOK | M_ZERO);
                        sc->dev[0] = sc_alloc_tty(0, unit * MAXCONS);
                        scp = alloc_scp(sc, sc->first_vty);
                        SC_STAT(sc->dev[0]) = scp;
                }
                sc->cur_scp = scp;

                /* copy screen to temporary buffer */
                sc_vtb_init(&scp->scr, VTB_FRAMEBUFFER, scp->xsize, scp->ysize,
                    (void *)scp->sc->adp->va_window, FALSE);
                if (ISTEXTSC(scp))
                        sc_vtb_copy(&scp->scr, 0, &scp->vtb, 0,
                            scp->xsize * scp->ysize);

                /* Sync h/w cursor position to s/w (sc and teken). */
                if (col >= scp->xsize)
                        col = 0;
                if (row >= scp->ysize)
                        row = scp->ysize - 1;
                scp->xpos = col;
                scp->ypos = row;
                scp->cursor_pos = scp->cursor_oldpos = row * scp->xsize + col;
                (*scp->tsw->te_sync)(scp);

                sc->dflt_curs_attr.base = 0;
                sc->dflt_curs_attr.height = howmany(scp->font_size, 8);
                sc->dflt_curs_attr.flags = 0;
                sc->dflt_curs_attr.bg[0] = FG_RED;
                sc->dflt_curs_attr.bg[1] = FG_LIGHTGREY;
                sc->dflt_curs_attr.bg[2] = FG_BLUE;
                sc->dflt_curs_attr.mouse_ba = FG_WHITE;
                sc->dflt_curs_attr.mouse_ia = FG_RED;
                sc->curs_attr = sc->dflt_curs_attr;
                scp->base_curs_attr = scp->dflt_curs_attr = sc->curs_attr;
                scp->curs_attr = scp->base_curs_attr;

#ifndef SC_NO_SYSMOUSE
                sc_mouse_move(scp, scp->xpixel / 2, scp->ypixel / 2);
#endif
                if (!ISGRAPHSC(scp)) {
                        sc_set_cursor_image(scp);
                        sc_draw_cursor_image(scp);
                }

                /* save font and palette */
#ifndef SC_NO_FONT_LOADING
                sc->fonts_loaded = 0;
                if (ISFONTAVAIL(sc->adp->va_flags)) {
#ifdef SC_DFLT_FONT
                        bcopy(dflt_font_8, sc->font_8, sizeof(dflt_font_8));
                        bcopy(dflt_font_14, sc->font_14, sizeof(dflt_font_14));
                        bcopy(dflt_font_16, sc->font_16, sizeof(dflt_font_16));
                        sc->fonts_loaded = FONT_16 | FONT_14 | FONT_8;
                        if (scp->font_size < 14) {
                                sc_load_font(scp, 0, 8, 8, sc->font_8, 0, 256);
                        } else if (scp->font_size >= 16) {
                                sc_load_font(
                                    scp, 0, 16, 8, sc->font_16, 0, 256);
                        } else {
                                sc_load_font(
                                    scp, 0, 14, 8, sc->font_14, 0, 256);
                        }
#else /* !SC_DFLT_FONT */
                        if (scp->font_size < 14) {
                                sc_save_font(scp, 0, 8, 8, sc->font_8, 0, 256);
                                sc->fonts_loaded = FONT_8;
                        } else if (scp->font_size >= 16) {
                                sc_save_font(
                                    scp, 0, 16, 8, sc->font_16, 0, 256);
                                sc->fonts_loaded = FONT_16;
                        } else {
                                sc_save_font(
                                    scp, 0, 14, 8, sc->font_14, 0, 256);
                                sc->fonts_loaded = FONT_14;
                        }
#endif /* SC_DFLT_FONT */
                        /* FONT KLUDGE: always use the font page #0. XXX */
                        sc_show_font(scp, 0);
                }
#endif /* !SC_NO_FONT_LOADING */

#ifndef SC_NO_PALETTE_LOADING
                vidd_save_palette(sc->adp, sc->palette);
#ifdef SC_PIXEL_MODE
                for (i = 0; i < sizeof(sc->palette2); i++)
                        sc->palette2[i] = i / 3;
#endif
#endif

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

        /* the rest is not necessary, if we have done it once */
        if (sc->flags & SC_INIT_DONE)
                return;

        /* initialize mapscrn arrays to a one to one map */
        for (i = 0; i < sizeof(sc->scr_map); i++)
                sc->scr_map[i] = sc->scr_rmap[i] = i;

        sc->flags |= SC_INIT_DONE;
}

static void
scterm(int unit, int flags)
{
        sc_softc_t *sc;
        scr_stat *scp;

        sc = sc_get_softc(unit, flags & SC_KERNEL_CONSOLE);
        if (sc == NULL)
                return; /* shouldn't happen */

#ifdef DEV_SPLASH
        /* this console is no longer available for the splash screen */
        if (sc->flags & SC_SPLASH_SCRN) {
                splash_term(sc->adp);
                sc->flags &= ~SC_SPLASH_SCRN;
        }
#endif

#if 0 /* XXX */
    /* move the hardware cursor to the upper-left corner */
    vidd_set_hw_cursor(sc->adp, 0, 0);
#endif

        /* release the keyboard and the video card */
        if (sc->kbd != NULL)
                kbd_release(sc->kbd, &sc->kbd);
        if (sc->adapter >= 0)
                vid_release(sc->adp, &sc->adapter);

        /* stop the terminal emulator, if any */
        scp = sc_get_stat(sc->dev[0]);
        if (scp->tsw)
                (*scp->tsw->te_term)(scp, &scp->ts);
        mtx_destroy(&sc->video_mtx);

        /* clear the structure */
        if (!(flags & SC_KERNEL_CONSOLE)) {
                free(scp->ts, M_DEVBUF);
                /* XXX: We need delete_dev() for this */
                free(sc->dev, M_DEVBUF);
#if 0
        /* XXX: We need a ttyunregister for this */
        free(sc->tty, M_DEVBUF);
#endif
#ifndef SC_NO_FONT_LOADING
                free(sc->font_8, M_DEVBUF);
                free(sc->font_14, M_DEVBUF);
                free(sc->font_16, M_DEVBUF);
#endif
                /* XXX vtb, history */
        }
        bzero(sc, sizeof(*sc));
        sc->adapter = -1;
}

static void
scshutdown(__unused void *arg, __unused int howto)
{

        KASSERT(sc_console != NULL, ("sc_console != NULL"));
        KASSERT(sc_console->sc != NULL, ("sc_console->sc != NULL"));
        KASSERT(sc_console->sc->cur_scp != NULL,
            ("sc_console->sc->cur_scp != NULL"));

        sc_touch_scrn_saver();
        if (!cold && sc_console->sc->cur_scp->index != sc_console->index &&
            sc_console->sc->cur_scp->smode.mode == VT_AUTO &&
            sc_console->smode.mode == VT_AUTO)
                sc_switch_scr(sc_console->sc, sc_console->index);
        shutdown_in_progress = TRUE;
}

static void
scsuspend(__unused void *arg)
{
        int retry;

        KASSERT(sc_console != NULL, ("sc_console != NULL"));
        KASSERT(sc_console->sc != NULL, ("sc_console->sc != NULL"));
        KASSERT(sc_console->sc->cur_scp != NULL,
            ("sc_console->sc->cur_scp != NULL"));

        sc_susp_scr = sc_console->sc->cur_scp->index;
        if (sc_no_suspend_vtswitch || sc_susp_scr == sc_console->index) {
                sc_touch_scrn_saver();
                sc_susp_scr = -1;
                return;
        }
        for (retry = 0; retry < 10; retry++) {
                sc_switch_scr(sc_console->sc, sc_console->index);
                if (!sc_console->sc->switch_in_progress)
                        break;
                pause("scsuspend", hz);
        }
        suspend_in_progress = TRUE;
}

static void
scresume(__unused void *arg)
{

        KASSERT(sc_console != NULL, ("sc_console != NULL"));
        KASSERT(sc_console->sc != NULL, ("sc_console->sc != NULL"));
        KASSERT(sc_console->sc->cur_scp != NULL,
            ("sc_console->sc->cur_scp != NULL"));

        suspend_in_progress = FALSE;
        if (sc_susp_scr < 0) {
                update_font(sc_console->sc->cur_scp);
                return;
        }
        sc_switch_scr(sc_console->sc, sc_susp_scr);
}

int
sc_clean_up(scr_stat *scp)
{
#ifdef DEV_SPLASH
        int error;
#endif

        if (scp->sc->flags & SC_SCRN_BLANKED) {
                sc_touch_scrn_saver();
#ifdef DEV_SPLASH
                if ((error = wait_scrn_saver_stop(scp->sc)))
                        return error;
#endif
        }
        scp->status |= MOUSE_HIDDEN;
        sc_remove_mouse_image(scp);
        sc_remove_cutmarking(scp);
        return 0;
}

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

        old = scp->vtb;
        sc_vtb_init(&new, VTB_MEMORY, scp->xsize, scp->ysize, NULL, wait);
        if (!discard && (old.vtb_flags & VTB_VALID)) {
                /* retain the current cursor position and buffer constants */
                scp->cursor_oldpos = scp->cursor_pos;
                /*
                 * This works only if the old buffer has the same size as or
                 * larger than the new one. XXX
                 */
                sc_vtb_copy(&old, 0, &new, 0, scp->xsize * scp->ysize);
                scp->vtb = new;
        } else {
                scp->vtb = new;
                sc_vtb_destroy(&old);
        }

#ifndef SC_NO_SYSMOUSE
        /* move the mouse cursor at the center of the screen */
        sc_mouse_move(scp, scp->xpixel / 2, scp->ypixel / 2);
#endif
}

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

        /* assert(sc_malloc) */

        scp = (scr_stat *)malloc(sizeof(scr_stat), M_DEVBUF, M_WAITOK);
        init_scp(sc, vty, scp);

        sc_alloc_scr_buffer(scp, TRUE, TRUE);
        if (sc_init_emulator(scp, SC_DFLT_TERM))
                sc_init_emulator(scp, "*");

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

#ifndef SC_NO_HISTORY
        sc_alloc_history_buffer(scp, 0, 0, TRUE);
#endif

        return scp;
}

static void
init_scp(sc_softc_t *sc, int vty, scr_stat *scp)
{
        video_info_t info;

        bzero(scp, sizeof(*scp));

        scp->index = vty;
        scp->sc = sc;
        scp->status = 0;
        scp->mode = sc->initial_mode;
        vidd_get_info(sc->adp, scp->mode, &info);
        if (info.vi_flags & V_INFO_GRAPHICS) {
                scp->status |= GRAPHICS_MODE;
                scp->xpixel = info.vi_width;
                scp->ypixel = info.vi_height;
                scp->xsize = info.vi_width / info.vi_cwidth;
                scp->ysize = info.vi_height / info.vi_cheight;
                scp->font_size = 0;
                scp->font = NULL;
        } else {
                scp->xsize = info.vi_width;
                scp->ysize = info.vi_height;
                scp->xpixel = scp->xsize * info.vi_cwidth;
                scp->ypixel = scp->ysize * info.vi_cheight;
        }

        scp->font_size = info.vi_cheight;
        scp->font_width = info.vi_cwidth;
#ifndef SC_NO_FONT_LOADING
        if (info.vi_cheight < 14)
                scp->font = sc->font_8;
        else if (info.vi_cheight >= 16)
                scp->font = sc->font_16;
        else
                scp->font = sc->font_14;
#else
        scp->font = NULL;
#endif

        sc_vtb_init(&scp->vtb, VTB_MEMORY, 0, 0, NULL, FALSE);
        sc_vtb_init(&scp->scr, VTB_FRAMEBUFFER, 0, 0, NULL, FALSE);
        scp->xoff = scp->yoff = 0;
        scp->xpos = scp->ypos = 0;
        scp->start = scp->xsize * scp->ysize - 1;
        scp->end = 0;
        scp->tsw = NULL;
        scp->ts = NULL;
        scp->rndr = NULL;
        scp->border = (SC_NORM_ATTR >> 4) & 0x0f;
        scp->base_curs_attr = scp->dflt_curs_attr = sc->curs_attr;
        scp->mouse_cut_start = scp->xsize * scp->ysize;
        scp->mouse_cut_end = -1;
        scp->mouse_signal = 0;
        scp->mouse_pid = 0;
        scp->mouse_proc = NULL;
        scp->kbd_mode = K_XLATE;
        scp->bell_pitch = bios_value.bell_pitch;
        scp->bell_duration = BELL_DURATION;
        scp->status |= (bios_value.shift_state & NLKED);
        scp->status |= CURSOR_ENABLED | MOUSE_HIDDEN;
        scp->pid = 0;
        scp->proc = NULL;
        scp->smode.mode = VT_AUTO;
        scp->history = NULL;
        scp->history_pos = 0;
        scp->history_size = 0;
}

int
sc_init_emulator(scr_stat *scp, char *name)
{
        sc_term_sw_t *sw;
        sc_rndr_sw_t *rndr;
        void *p;
        int error;

        if (name == NULL) /* if no name is given, use the current emulator */
                sw = scp->tsw;
        else /* ...otherwise find the named emulator */
                sw = sc_term_match(name);
        if (sw == NULL)
                return EINVAL;

        rndr = NULL;
        if (strcmp(sw->te_renderer, "*") != 0) {
                rndr = sc_render_match(scp, sw->te_renderer,
                    scp->status & (GRAPHICS_MODE | PIXEL_MODE));
        }
        if (rndr == NULL) {
                rndr = sc_render_match(scp, scp->sc->adp->va_name,
                    scp->status & (GRAPHICS_MODE | PIXEL_MODE));
                if (rndr == NULL)
                        return ENODEV;
        }

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

        if (sc_malloc && (sw->te_size > 0))
                p = malloc(sw->te_size, M_DEVBUF, M_NOWAIT);
        else
                p = NULL;
        error = (*sw->te_init)(scp, &p, SC_TE_COLD_INIT);
        if (error)
                return error;

        if (scp->tsw)
                (*scp->tsw->te_term)(scp, &scp->ts);
        if (scp->ts != NULL)
                free(scp->ts, M_DEVBUF);
        scp->tsw = sw;
        scp->ts = p;
        scp->rndr = rndr;
        scp->rndr->init(scp);

        (*sw->te_default_attr)(scp, SC_NORM_ATTR, SC_NORM_REV_ATTR);
        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, struct sc_cnstate *sp)
{
        scr_stat *scp;
#ifndef SC_NO_HISTORY
        struct tty *tp;
#endif
        u_int c;
        int this_scr;
        int f;
        int i;

        if (sc->kbd == NULL)
                return NOKEY;

next_code:
#if 1
        /* I don't like this, but... XXX */
        if (flags & SCGETC_CN)
                sccnupdate(sc->cur_scp);
#endif
        scp = sc->cur_scp;
        /* first see if there is something in the keyboard port */
        for (;;) {
                if (flags & SCGETC_CN)
                        sccnscrunlock(sc, sp);
                c = kbdd_read_char(sc->kbd, !(flags & SCGETC_NONBLOCK));
                if (flags & SCGETC_CN)
                        sccnscrlock(sc, sp);
                if (c == ERRKEY) {
                        if (!(flags & SCGETC_CN))
                                sc_bell(
                                    scp, bios_value.bell_pitch, BELL_DURATION);
                } else if (c == NOKEY)
                        return c;
                else
                        break;
        }

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

        if (!(flags & SCGETC_CN))
                random_harvest_queue(&c, sizeof(c), RANDOM_KEYBOARD);

        if (sc->kbd_open_level == 0 && scp->kbd_mode != K_XLATE)
                return KEYCHAR(c);

        /* if scroll-lock pressed allow history browsing */
        if (!ISGRAPHSC(scp) && scp->history && scp->status & SLKED) {
                scp->status &= ~CURSOR_ENABLED;
                sc_remove_cursor_image(scp);

#ifndef SC_NO_HISTORY
                if (!(scp->status & BUFFER_SAVED)) {
                        scp->status |= BUFFER_SAVED;
                        sc_hist_save(scp);
                }
                switch (c) {
                /* FIXME: key codes */
                case SPCLKEY | FKEY | F(49): /* home key */
                        sc_remove_cutmarking(scp);
                        sc_hist_home(scp);
                        goto next_code;

                case SPCLKEY | FKEY | F(57): /* end key */
                        sc_remove_cutmarking(scp);
                        sc_hist_end(scp);
                        goto next_code;

                case SPCLKEY | FKEY | F(50): /* up arrow key */
                        sc_remove_cutmarking(scp);
                        if (sc_hist_up_line(scp))
                                if (!(flags & SCGETC_CN))
                                        sc_bell(scp, bios_value.bell_pitch,
                                            BELL_DURATION);
                        goto next_code;

                case SPCLKEY | FKEY | F(58): /* down arrow key */
                        sc_remove_cutmarking(scp);
                        if (sc_hist_down_line(scp))
                                if (!(flags & SCGETC_CN))
                                        sc_bell(scp, bios_value.bell_pitch,
                                            BELL_DURATION);
                        goto next_code;

                case SPCLKEY | FKEY | F(51): /* page up key */
                        sc_remove_cutmarking(scp);
                        for (i = 0; i < scp->ysize; i++)
                                if (sc_hist_up_line(scp)) {
                                        if (!(flags & SCGETC_CN))
                                                sc_bell(scp,
                                                    bios_value.bell_pitch,
                                                    BELL_DURATION);
                                        break;
                                }
                        goto next_code;

                case SPCLKEY | FKEY | F(59): /* page down key */
                        sc_remove_cutmarking(scp);
                        for (i = 0; i < scp->ysize; i++)
                                if (sc_hist_down_line(scp)) {
                                        if (!(flags & SCGETC_CN))
                                                sc_bell(scp,
                                                    bios_value.bell_pitch,
                                                    BELL_DURATION);
                                        break;
                                }
                        goto next_code;
                }
#endif /* SC_NO_HISTORY */
        }

        /*
         * Process and consume special keys here.  Return a plain char code
         * or a char code with the META flag or a function key code.
         */
        if (c & RELKEY) {
                /* key released */
                /* goto next_code */
        } else {
                /* key pressed */
                if (c & SPCLKEY) {
                        c &= ~SPCLKEY;
                        switch (KEYCHAR(c)) {
                        /* LOCKING KEYS */
                        case NLK:
                        case CLK:
                        case ALK:
                                break;
                        case SLK:
                                (void)kbdd_ioctl(
                                    sc->kbd, KDGKBSTATE, (caddr_t)&f);
                                if (f & SLKED) {
                                        scp->status |= SLKED;
                                } else {
                                        if (scp->status & SLKED) {
                                                scp->status &= ~SLKED;
#ifndef SC_NO_HISTORY
                                                if (scp->status &
                                                    BUFFER_SAVED) {
                                                        if (!sc_hist_restore(
                                                                scp))
                                                                sc_remove_cutmarking(
                                                                    scp);
                                                        scp->status &=
                                                            ~BUFFER_SAVED;
                                                        scp->status |=
                                                            CURSOR_ENABLED;
                                                        sc_draw_cursor_image(
                                                            scp);
                                                }
                                                /* Only safe in Giant-locked
                                                 * context. */
                                                tp = SC_DEV(sc, scp->index);
                                                if (!(flags & SCGETC_CN) &&
                                                    tty_opened_ns(tp))
                                                        sctty_outwakeup(tp);
#endif
                                        }
                                }
                                break;

                        case PASTE:
#ifndef SC_NO_CUTPASTE
                                sc_mouse_paste(scp);
#endif
                                break;

                        /* NON-LOCKING KEYS */
                        case NOP:
                        case LSH:
                        case RSH:
                        case LCTR:
                        case RCTR:
                        case LALT:
                        case RALT:
                        case ASH:
                        case META:
                                break;

                        case BTAB:
                                if (!(sc->flags & SC_SCRN_BLANKED))
                                        return c;
                                break;

                        case SPSC:
#ifdef DEV_SPLASH
                                /* force activatation/deactivation of the screen
                                 * saver */
                                if (!(sc->flags & SC_SCRN_BLANKED)) {
                                        run_scrn_saver = TRUE;
                                        sc->scrn_time_stamp -= scrn_blank_time;
                                }
                                if (cold) {
                                        /*
                                         * While devices are being probed, the
                                         * screen saver need to be invoked
                                         * explicitly. XXX
                                         */
                                        if (sc->flags & SC_SCRN_BLANKED) {
                                                scsplash_stick(FALSE);
                                                stop_scrn_saver(
                                                    sc, current_saver);
                                        } else {
                                                if (!ISGRAPHSC(scp)) {
                                                        scsplash_stick(TRUE);
                                                        (*current_saver)(
                                                            sc, TRUE);
                                                }
                                        }
                                }
#endif /* DEV_SPLASH */
                                break;

                        case RBT:
#ifndef SC_DISABLE_REBOOT
                                if (enable_reboot && !(flags & SCGETC_CN))
                                        shutdown_nice(0);
#endif
                                break;

                        case HALT:
#ifndef SC_DISABLE_REBOOT
                                if (enable_reboot && !(flags & SCGETC_CN))
                                        shutdown_nice(RB_HALT);
#endif
                                break;

                        case PDWN:
#ifndef SC_DISABLE_REBOOT
                                if (enable_reboot && !(flags & SCGETC_CN))
                                        shutdown_nice(RB_HALT | RB_POWEROFF);
#endif
                                break;

                        case SUSP:
                                power_pm_suspend(POWER_SSTATE_TRANSITION_SUSPEND);
                                break;
                        case STBY:
                                power_pm_suspend(POWER_SSTATE_TRANSITION_STANDBY);
                                break;

                        case DBG:
#ifndef SC_DISABLE_KDBKEY
                                if (enable_kdbkey)
                                        kdb_break();
#endif
                                break;

                        case PNC:
                                if (enable_panic_key)
                                        panic("Forced by the panic key");
                                break;

                        case NEXT:
                                this_scr = scp->index;
                                for (i = (this_scr - sc->first_vty + 1) %
                                         sc->vtys;
                                     sc->first_vty + i != this_scr;
                                     i = (i + 1) % sc->vtys) {
                                        struct tty *tp =
                                            SC_DEV(sc, sc->first_vty + i);
                                        if (tty_opened_ns(tp)) {
                                                sc_switch_scr(
                                                    scp->sc, sc->first_vty + i);
                                                break;
                                        }
                                }
                                break;

                        case PREV:
                                this_scr = scp->index;
                                for (i = (this_scr - sc->first_vty + sc->vtys -
                                             1) %
                                         sc->vtys;
                                     sc->first_vty + i != this_scr;
                                     i = (i + sc->vtys - 1) % sc->vtys) {
                                        struct tty *tp =
                                            SC_DEV(sc, sc->first_vty + i);
                                        if (tty_opened_ns(tp)) {
                                                sc_switch_scr(
                                                    scp->sc, sc->first_vty + i);
                                                break;
                                        }
                                }
                                break;

                        default:
                                if (KEYCHAR(c) >= F_SCR &&
                                    KEYCHAR(c) <= L_SCR) {
                                        sc_switch_scr(scp->sc,
                                            sc->first_vty + KEYCHAR(c) - F_SCR);
                                        break;
                                }
                                /* assert(c & FKEY) */
                                if (!(sc->flags & SC_SCRN_BLANKED))
                                        return c;
                                break;
                        }
                        /* goto next_code */
                } else {
                        /* regular keys (maybe MKEY is set) */
#if !defined(SC_DISABLE_KDBKEY) && defined(KDB)
                        if (enable_kdbkey)
                                kdb_alt_break(c, &sc->sc_altbrk);
#endif
                        if (!(sc->flags & SC_SCRN_BLANKED))
                                return c;
                }
        }

        goto next_code;
}

static int
sctty_mmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
    vm_memattr_t *memattr)
{
        scr_stat *scp;

        scp = sc_get_stat(tp);
        if (scp != scp->sc->cur_scp)
                return -1;
        return vidd_mmap(scp->sc->adp, offset, paddr, nprot, memattr);
}

static void
update_font(scr_stat *scp)
{
#ifndef SC_NO_FONT_LOADING
        /* load appropriate font */
        if (!(scp->status & GRAPHICS_MODE)) {
                if (!(scp->status & PIXEL_MODE) &&
                    ISFONTAVAIL(scp->sc->adp->va_flags)) {
                        if (scp->font_size < 14) {
                                if (scp->sc->fonts_loaded & FONT_8)
                                        sc_load_font(scp, 0, 8, 8,
                                            scp->sc->font_8, 0, 256);
                        } else if (scp->font_size >= 16) {
                                if (scp->sc->fonts_loaded & FONT_16)
                                        sc_load_font(scp, 0, 16, 8,
                                            scp->sc->font_16, 0, 256);
                        } else {
                                if (scp->sc->fonts_loaded & FONT_14)
                                        sc_load_font(scp, 0, 14, 8,
                                            scp->sc->font_14, 0, 256);
                        }
                        /*
                         * FONT KLUDGE:
                         * This is an interim kludge to display correct font.
                         * Always use the font page #0 on the video plane 2.
                         * Somehow we cannot show the font in other font pages
                         * on some video cards... XXX
                         */
                        sc_show_font(scp, 0);
                }
                mark_all(scp);
        }
#endif /* !SC_NO_FONT_LOADING */
}

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

        error = kbdd_ioctl(scp->sc->kbd, KDGKBSTATE, (caddr_t)&state);
        if (error == ENOIOCTL)
                error = ENODEV;
        if (error == 0) {
                scp->status &= ~LOCK_MASK;
                scp->status |= state;
        }
        return error;
}

static int
update_kbd_state(scr_stat *scp, int new_bits, int mask)
{
        int state;
        int error;

        if (mask != LOCK_MASK) {
                error = kbdd_ioctl(scp->sc->kbd, KDGKBSTATE, (caddr_t)&state);
                if (error == ENOIOCTL)
                        error = ENODEV;
                if (error)
                        return error;
                state &= ~mask;
                state |= new_bits & mask;
        } else {
                state = new_bits & LOCK_MASK;
        }
        error = kbdd_ioctl(scp->sc->kbd, KDSKBSTATE, (caddr_t)&state);
        if (error == ENOIOCTL)
                error = ENODEV;
        return error;
}

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

        which &= LOCK_MASK;
        error = kbdd_ioctl(scp->sc->kbd, KDSETLED, (caddr_t)&which);
        if (error == ENOIOCTL)
                error = ENODEV;
        return error;
}

int
set_mode(scr_stat *scp)
{
        video_info_t info;

        /* reject unsupported mode */
        if (vidd_get_info(scp->sc->adp, scp->mode, &info))
                return 1;

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

        /* setup video hardware for the given mode */
        vidd_set_mode(scp->sc->adp, scp->mode);
        scp->rndr->init(scp);
        sc_vtb_init(&scp->scr, VTB_FRAMEBUFFER, scp->xsize, scp->ysize,
            (void *)scp->sc->adp->va_window, FALSE);

        update_font(scp);

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

        return 0;
}

void
sc_set_border(scr_stat *scp, int color)
{
        SC_VIDEO_LOCK(scp->sc);
        (*scp->rndr->draw_border)(scp, color);
        SC_VIDEO_UNLOCK(scp->sc);
}

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

        sc = scp->sc;
        sc->font_loading_in_progress = TRUE;
        vidd_load_font(sc->adp, page, size, width, buf, base, count);
        sc->font_loading_in_progress = FALSE;
}

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

        sc = scp->sc;
        sc->font_loading_in_progress = TRUE;
        vidd_save_font(sc->adp, page, size, width, buf, base, count);
        sc->font_loading_in_progress = FALSE;
}

void
sc_show_font(scr_stat *scp, int page)
{
        vidd_show_font(scp->sc->adp, page);
}
#endif /* !SC_NO_FONT_LOADING */

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

        tp = SC_DEV(scp->sc, scp->sc->cur_scp->index);
        if (!tty_opened_ns(tp))
                return;
        rmap = scp->sc->scr_rmap;
        for (; count > 0; --count)
                ttydisc_rint(tp, rmap[*p++], 0);
        ttydisc_rint_done(tp);
}

void
sc_respond(scr_stat *scp, const u_char *p, int count, int wakeup)
{
        struct tty *tp;

        tp = SC_DEV(scp->sc, scp->sc->cur_scp->index);
        if (!tty_opened_ns(tp))
                return;
        ttydisc_rint_simple(tp, p, count);
        if (wakeup) {
                /* XXX: we can't always call ttydisc_rint_done() here! */
                ttydisc_rint_done(tp);
        }
}

/*
 * pitch is the divisor for 1.193182MHz PIT clock. By dividing 1193172 / pitch,
 * we convert it back to Hz.
 * duration is in ticks of 1/hz.
 */
void
sc_bell(scr_stat *scp, int pitch, int duration)
{
        if (cold || kdb_active || shutdown_in_progress || !enable_bell)
                return;

        if (scp != scp->sc->cur_scp && (scp->sc->flags & SC_QUIET_BELL))
                return;

        if (scp->sc->flags & SC_VISUAL_BELL) {
                if (scp->sc->blink_in_progress)
                        return;
                scp->sc->blink_in_progress = 3;
                if (scp != scp->sc->cur_scp)
                        scp->sc->blink_in_progress += 2;
                blink_screen(scp->sc->cur_scp);
        } else if (duration != 0 && pitch != 0) {
                if (scp != scp->sc->cur_scp)
                        pitch *= 2;
                sysbeep(1193182 / pitch, SBT_1S * duration / hz);
        }
}

static int
sc_kattr(void)
{
        if (sc_console == NULL)
                return (SC_KERNEL_CONS_ATTR); /* for very early, before pcpu */
        return (sc_kattrtab[curcpu % nitems(sc_kattrtab)]);
}

static void
blink_screen(void *arg)
{
        scr_stat *scp = arg;
        struct tty *tp;

        if (ISGRAPHSC(scp) || (scp->sc->blink_in_progress <= 1)) {
                scp->sc->blink_in_progress = 0;
                mark_all(scp);
                tp = SC_DEV(scp->sc, scp->index);
                if (tty_opened_ns(tp))
                        sctty_outwakeup(tp);
                if (scp->sc->delayed_next_scr)
                        sc_switch_scr(scp->sc, scp->sc->delayed_next_scr - 1);
        } else {
                (*scp->rndr->draw)(scp, 0, scp->xsize * scp->ysize,
                    scp->sc->blink_in_progress & 1);
                scp->sc->blink_in_progress--;
                callout_reset_sbt(&scp->sc->cblink, SBT_1S / 15, 0,
                    blink_screen, scp, C_PREL(0));
        }
}

/*
 * Until sc_attach_unit() gets called no dev structures will be available
 * to store the per-screen current status.  This is the case when the
 * kernel is initially booting and needs access to its console.  During
 * this early phase of booting the console's current status is kept in
 * one statically defined scr_stat structure, and any pointers to the
 * dev structures will be NULL.
 */

static scr_stat *
sc_get_stat(struct tty *tp)
{
        if (tp == NULL)
                return (&main_console);
        return (SC_STAT(tp));
}

/*
 * Allocate active keyboard. Try to allocate "kbdmux" keyboard first, and,
 * if found, add all non-busy keyboards to "kbdmux". Otherwise look for
 * any keyboard.
 */

static int
sc_allocate_keyboard(sc_softc_t *sc, int unit)
{
        int idx0, idx;
        keyboard_t *k0, *k;
        keyboard_info_t ki;

        idx0 =
            kbd_allocate("kbdmux", -1, (void *)&sc->kbd, sckbdevent, sc);
        if (idx0 != -1) {
                k0 = kbd_get_keyboard(idx0);

                for (idx = kbd_find_keyboard2("*", -1, 0); idx != -1;
                     idx = kbd_find_keyboard2("*", -1, idx + 1)) {
                        k = kbd_get_keyboard(idx);

                        if (idx == idx0 || KBD_IS_BUSY(k))
                                continue;

                        bzero(&ki, sizeof(ki));
                        strcpy(ki.kb_name, k->kb_name);
                        ki.kb_unit = k->kb_unit;

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

        return (idx0);
}