/*-
 * (MPSAFE)
 *
 * Copyright (c) 1998 Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
 * All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Sascha Wildner <saw@online.de>.
 *
 * Simple font scaling code by Sascha Wildner and Matthew Dillon
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer as
 *    the first lines of this file unmodified.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD: src/sys/dev/syscons/scvidctl.c,v 1.19.2.2 2000/05/05 09:16:08 nyan Exp $
 */

#include "opt_syscons.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/signalvar.h>
#include <sys/tty.h>
#include <sys/kernel.h>
#include <sys/thread2.h>

#include <machine/console.h>
#include <machine/framebuffer.h>

#include <dev/video/fb/fbreg.h>
#include "syscons.h"

SET_DECLARE(scrndr_set, const sc_renderer_t);

int
sc_set_text_mode(scr_stat *scp, struct tty *tp, int mode, int xsize, int ysize,
                 int fontsize)
{
    video_info_t info;
    u_char *font;
    int prev_ysize;
    int new_ysize;
    int error;

    lwkt_gettoken(&vga_token);
    if ((*vidsw[scp->sc->adapter]->get_info)(scp->sc->adp, mode, &info)) {
        lwkt_reltoken(&vga_token);
        return ENODEV;
    }

    /* adjust argument values */
    if (fontsize <= 0)
        fontsize = info.vi_cheight;
    if (fontsize < 14) {
        fontsize = 8;
#ifndef SC_NO_FONT_LOADING
        if (!(scp->sc->fonts_loaded & FONT_8)) {
            lwkt_reltoken(&vga_token);
            return EINVAL;
        }
        font = scp->sc->font_8;
#else
        font = NULL;
#endif
    } else if (fontsize >= 16) {
        fontsize = 16;
#ifndef SC_NO_FONT_LOADING
        if (!(scp->sc->fonts_loaded & FONT_16)) {
            lwkt_reltoken(&vga_token);
            return EINVAL;
        }
        font = scp->sc->font_16;
#else
        font = NULL;
#endif
    } else {
        fontsize = 14;
#ifndef SC_NO_FONT_LOADING
        if (!(scp->sc->fonts_loaded & FONT_14)) {
            lwkt_reltoken(&vga_token);
            return EINVAL;
        }
        font = scp->sc->font_14;
#else
        font = NULL;
#endif
    }
    if ((xsize <= 0) || (xsize > info.vi_width))
        xsize = info.vi_width;
    if ((ysize <= 0) || (ysize > info.vi_height))
        ysize = info.vi_height;

    /* stop screen saver, etc */
    if ((error = sc_clean_up(scp, FALSE))) {
        lwkt_reltoken(&vga_token);
        return error;
    }

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

    /* set up scp */
    new_ysize = 0;
#ifndef SC_NO_HISTORY
    if (scp->history != NULL) {
        sc_hist_save(scp);
        new_ysize = sc_vtb_rows(scp->history); 
    }
#endif
    prev_ysize = scp->ysize;
    /*
     * This is a kludge to fend off scrn_update() while we
     * muck around with scp. XXX
     */
    scp->status |= UNKNOWN_MODE | MOUSE_HIDDEN;
    scp->status &= ~(GRAPHICS_MODE | PIXEL_MODE | MOUSE_VISIBLE);
    scp->mode = mode;
    scp->model = V_INFO_MM_TEXT;
    scp->xsize = xsize;
    scp->ysize = ysize;
    scp->xoff = 0;
    scp->yoff = 0;
    scp->xpixel = scp->xsize*8;
    scp->ypixel = scp->ysize*fontsize;
    scp->font = font;
    scp->font_height = fontsize;
    scp->font_width = 8;

    /* allocate buffers */
    sc_alloc_scr_buffer(scp, TRUE, TRUE);
    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, new_ysize, prev_ysize, FALSE);
#endif

    if (scp == scp->sc->cur_scp)
        set_mode(scp);
    scp->status &= ~UNKNOWN_MODE;

    if (tp) {
        DPRINTF(5, ("ws_*size (%d,%d), size (%d,%d)\n",
                tp->t_winsize.ws_col, tp->t_winsize.ws_row,
                scp->xsize, scp->ysize));
        if (tp->t_winsize.ws_col != scp->xsize ||
            tp->t_winsize.ws_row != scp->ysize) {
            tp->t_winsize.ws_col = scp->xsize;
            tp->t_winsize.ws_row = scp->ysize;
            pgsignal(tp->t_pgrp, SIGWINCH, 1);
        }
    }
    lwkt_reltoken(&vga_token);

    return 0;
}

int
sc_set_graphics_mode(scr_stat *scp, struct tty *tp, int mode)
{
#ifdef SC_NO_MODE_CHANGE
    return ENODEV;
#else
    video_info_t info;
    int error;

    lwkt_gettoken(&vga_token);
    if ((*vidsw[scp->sc->adapter]->get_info)(scp->sc->adp, mode, &info)) {
        lwkt_reltoken(&vga_token);
        return ENODEV;
    }
    lwkt_reltoken(&vga_token);

    /* stop screen saver, etc */
    crit_enter();
    if ((error = sc_clean_up(scp, FALSE))) {
        crit_exit();
        return error;
    }

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

    /* set up scp */
    scp->status |= (UNKNOWN_MODE | GRAPHICS_MODE | MOUSE_HIDDEN);
    scp->status &= ~(PIXEL_MODE | MOUSE_VISIBLE);
    scp->mode = mode;
    scp->model = V_INFO_MM_OTHER;
    /*
     * Don't change xsize and ysize; preserve the previous vty
     * and history buffers.
     */
    scp->xoff = 0;
    scp->yoff = 0;
    scp->xpixel = info.vi_width;
    scp->ypixel = info.vi_height;
    scp->font = NULL;
    scp->font_height = 0;
    scp->font_width = 0;
#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
    sc_init_emulator(scp, NULL);
    crit_exit();

    if (scp == scp->sc->cur_scp)
        set_mode(scp);
    /* clear_graphics();*/
    refresh_ega_palette(scp);
    scp->status &= ~UNKNOWN_MODE;

    if (tp) {
        if (tp->t_winsize.ws_xpixel != scp->xpixel ||
            tp->t_winsize.ws_ypixel != scp->ypixel) {
            tp->t_winsize.ws_xpixel = scp->xpixel;
            tp->t_winsize.ws_ypixel = scp->ypixel;
            pgsignal(tp->t_pgrp, SIGWINCH, 1);
        }
    }

    return 0;
#endif /* SC_NO_MODE_CHANGE */
}

int
sc_set_pixel_mode(scr_stat *scp, struct tty *tp, int xsize, int ysize, 
                  int fontsize)
{
#ifndef SC_PIXEL_MODE
    return ENODEV;
#else
    video_info_t info;
    u_char *font;
    int prev_ysize;
    int new_ysize;
    int error;

    lwkt_gettoken(&vga_token);
    if ((*vidsw[scp->sc->adapter]->get_info)(scp->sc->adp, scp->mode, &info)) {
        lwkt_reltoken(&vga_token);
        return ENODEV;          /* this shouldn't happen */
    }
    lwkt_reltoken(&vga_token);

    /* adjust argument values */
    if (fontsize <= 0)
        fontsize = info.vi_cheight;
    if (fontsize < 14) {
        fontsize = 8;
#ifndef SC_NO_FONT_LOADING
        if (!(scp->sc->fonts_loaded & FONT_8))
            return EINVAL;
        font = scp->sc->font_8;
#else
        font = NULL;
#endif
    } else if (fontsize >= 16) {
        fontsize = 16;
#ifndef SC_NO_FONT_LOADING
        if (!(scp->sc->fonts_loaded & FONT_16))
            return EINVAL;
        font = scp->sc->font_16;
#else
        font = NULL;
#endif
    } else {
        fontsize = 14;
#ifndef SC_NO_FONT_LOADING
        if (!(scp->sc->fonts_loaded & FONT_14))
            return EINVAL;
        font = scp->sc->font_14;
#else
        font = NULL;
#endif
    }
    if (xsize <= 0)
        xsize = info.vi_width/8;
    if (ysize <= 0)
        ysize = info.vi_height/fontsize;

    if ((info.vi_width < xsize*8) || (info.vi_height < ysize*fontsize))
        return EINVAL;

    /*
     * We currently support the following graphic modes:
     *
     * - 4 bpp planar modes whose memory size does not exceed 64K
     * - 8 bbp packed pixel modes
     * - 15, 16, 24 and 32 bpp direct modes with linear frame buffer
     */

    if (info.vi_mem_model == V_INFO_MM_PLANAR) {
        if (info.vi_planes != 4)
            return ENODEV;

        /*
         * A memory size >64K requires bank switching to access the entire
         * screen. XXX
         */

        if (info.vi_width * info.vi_height / 8 > info.vi_window_size)
            return ENODEV;
    } else if (info.vi_mem_model == V_INFO_MM_PACKED) {
        if (info.vi_depth != 8)
            return ENODEV;
    } else if (info.vi_mem_model == V_INFO_MM_DIRECT) {
        if (!(info.vi_flags & V_INFO_LINEAR) &&
            (info.vi_depth != 15) && (info.vi_depth != 16) &&
            (info.vi_depth != 24) && (info.vi_depth != 32))
            return ENODEV;
    } else
        return ENODEV;

    /* stop screen saver, etc */
    crit_enter();
    if ((error = sc_clean_up(scp, FALSE))) {
        crit_exit();
        return error;
    }

    if (sc_render_match(scp, scp->sc->adp->va_name, info.vi_mem_model) == NULL) {
        crit_exit();
        return ENODEV;
    }

#if 0
    if (scp->tsw)
        (*scp->tsw->te_term)(scp, scp->ts);
    scp->tsw = NULL;
    scp->ts = NULL;
#endif

    /* set up scp */
    new_ysize = 0;
#ifndef SC_NO_HISTORY
    if (scp->history != NULL) {
        sc_hist_save(scp);
        new_ysize = sc_vtb_rows(scp->history);
    }
#endif
    prev_ysize = scp->ysize;
    scp->status |= (UNKNOWN_MODE | PIXEL_MODE | MOUSE_HIDDEN);
    scp->status &= ~(GRAPHICS_MODE | MOUSE_VISIBLE);
    scp->model = info.vi_mem_model;
    scp->xsize = xsize;
    scp->ysize = ysize;
    scp->xoff = (scp->xpixel/8 - xsize)/2;
    scp->yoff = (scp->ypixel/fontsize - ysize)/2;
    scp->font = font;
    scp->font_height = fontsize;
    scp->font_width = 8;

    /* allocate buffers */
    sc_alloc_scr_buffer(scp, TRUE, TRUE);
    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, new_ysize, prev_ysize, FALSE);
#endif
    crit_exit();

    if (scp == scp->sc->cur_scp) {
        sc_set_border(scp, scp->border);
        sc_set_cursor_image(scp);
    }

    scp->status &= ~UNKNOWN_MODE;

    if (tp) {
        if (tp->t_winsize.ws_col != scp->xsize ||
            tp->t_winsize.ws_row != scp->ysize) {
            tp->t_winsize.ws_col = scp->xsize;
            tp->t_winsize.ws_row = scp->ysize;
            pgsignal(tp->t_pgrp, SIGWINCH, 1);
        }
    }

    return 0;
#endif /* SC_PIXEL_MODE */
}

#define fb_ioctl(a, c, d)               \
        (((a) == NULL) ? ENODEV :       \
                         (*vidsw[(a)->va_index]->ioctl)((a), (c), (caddr_t)(d)))

int
sc_vid_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag)
{
    scr_stat *scp;
    video_adapter_t *adp;
#ifndef SC_NO_MODE_CHANGE
    video_info_t info;
#endif
    int error, ret;

    KKASSERT(tp->t_dev);

    scp = SC_STAT(tp->t_dev);
    if (scp == NULL)            /* tp == SC_MOUSE */
        return ENOIOCTL;
    adp = scp->sc->adp;
    if (adp == NULL && scp->sc->fbi == NULL)    /* shouldn't happen??? */
        return ENODEV;

    lwkt_gettoken(&vga_token);
    switch (cmd) {

    case CONS_CURRENTADP:       /* get current adapter index */
    case FBIO_ADAPTER:
        if (scp->sc->fbi != NULL) {
            ret = ENODEV;
        } else {
            ret = fb_ioctl(adp, FBIO_ADAPTER, data);
        }
        lwkt_reltoken(&vga_token);
        return ret;

    case CONS_CURRENT:          /* get current adapter type */
    case FBIO_ADPTYPE:
        if (scp->sc->fbi != NULL) {
            ret = ENODEV;
        } else {
            ret = fb_ioctl(adp, FBIO_ADPTYPE, data);
        }
        lwkt_reltoken(&vga_token);
        return ret;

    case CONS_ADPINFO:          /* adapter information */
    case FBIO_ADPINFO:
        if (scp->sc->fbi != NULL) {
            lwkt_reltoken(&vga_token);
            return ENODEV;
        }
        if (((video_adapter_info_t *)data)->va_index >= 0) {
            adp = vid_get_adapter(((video_adapter_info_t *)data)->va_index);
            if (adp == NULL) {
                lwkt_reltoken(&vga_token);
                return ENODEV;
            }
        }
        ret = fb_ioctl(adp, FBIO_ADPINFO, data);
        lwkt_reltoken(&vga_token);
        return ret;

    case CONS_GET:              /* get current video mode */
    case FBIO_GETMODE:
        *(int *)data = scp->mode;
        lwkt_reltoken(&vga_token);
        return 0;

#ifndef SC_NO_MODE_CHANGE
    case CONS_SET:
    case FBIO_SETMODE:          /* set video mode */
        if (scp->sc->fbi != NULL) {
                lwkt_reltoken(&vga_token);
                if (*(int *)data != 0)
                        return ENODEV;
                else
                        return 0;
        }
        if (!(adp->va_flags & V_ADP_MODECHANGE)) {
            lwkt_reltoken(&vga_token);
            return ENODEV;
        }
        info.vi_mode = *(int *)data;
        error = fb_ioctl(adp, FBIO_MODEINFO, &info);
        if (error) {
            lwkt_reltoken(&vga_token);
            return error;
        }
        if (info.vi_flags & V_INFO_GRAPHICS) {
            lwkt_reltoken(&vga_token);
            return sc_set_graphics_mode(scp, tp, *(int *)data);
        } else {
            lwkt_reltoken(&vga_token);
            return sc_set_text_mode(scp, tp, *(int *)data, 0, 0, 0);
        }
#endif /* SC_NO_MODE_CHANGE */

    case CONS_MODEINFO:         /* get mode information */
    case FBIO_MODEINFO:
        if (scp->sc->fbi != NULL) {
            /* Fabricate some mode information for KMS framebuffer */
            video_info_t *vinfo = (video_info_t *)data;
            vinfo->vi_mode = 0;
            vinfo->vi_flags = V_INFO_COLOR;
            vinfo->vi_width = scp->xsize;
            vinfo->vi_height = scp->ysize;
            vinfo->vi_cwidth = scp->font_width;
            vinfo->vi_cheight = scp->font_height;
            vinfo->vi_window = 0;
            vinfo->vi_window_size = 0;
            vinfo->vi_buffer = 0;
            vinfo->vi_buffer_size = 0;
            vinfo->vi_mem_model = V_INFO_MM_TEXT;
            ret = 0;
        } else {
            ret = fb_ioctl(adp, FBIO_MODEINFO, data);
        }
        lwkt_reltoken(&vga_token);
        return ret;

    case CONS_FINDMODE:         /* find a matching video mode */
    case FBIO_FINDMODE:
        if (scp->sc->fbi != NULL) {
            ret = ENODEV;
        } else {
            ret = fb_ioctl(adp, FBIO_FINDMODE, data);
        }
        lwkt_reltoken(&vga_token);
        return ret;

    case CONS_SETWINORG:        /* set frame buffer window origin */
    case FBIO_SETWINORG:
        if (scp != scp->sc->cur_scp) {
            lwkt_reltoken(&vga_token);
            return ENODEV;      /* XXX */
        }
        if (scp->sc->fbi != NULL) {
            lwkt_reltoken(&vga_token);
            return ENODEV;
        }
        ret = fb_ioctl(adp, FBIO_SETWINORG, data);
        lwkt_reltoken(&vga_token);
        return ret;

    case FBIO_GETWINORG:        /* get frame buffer window origin */
        if (scp != scp->sc->cur_scp) {
            lwkt_reltoken(&vga_token);
            return ENODEV;      /* XXX */
        }
        if (scp->sc->fbi != NULL) {
            ret = ENODEV;
        } else {
            ret = fb_ioctl(adp, FBIO_GETWINORG, data);
        }
        lwkt_reltoken(&vga_token);
        return ret;

    case FBIO_GETDISPSTART:
    case FBIO_SETDISPSTART:
    case FBIO_GETLINEWIDTH:
    case FBIO_SETLINEWIDTH:
        if (scp != scp->sc->cur_scp) {
            lwkt_reltoken(&vga_token);
            return ENODEV;      /* XXX */
        }
        if (scp->sc->fbi != NULL) {
            if (cmd == FBIO_GETLINEWIDTH) {
                *(u_int *)data = scp->sc->fbi->stride;
                ret = 0;
            } else {
                ret = ENODEV;
            }
        } else {
            ret = fb_ioctl(adp, cmd, data);
        }
        lwkt_reltoken(&vga_token);
        return ret;

    case FBIO_BLANK:
        if (scp != scp->sc->cur_scp) {
            lwkt_reltoken(&vga_token);
            return ENODEV;
        }
        if (scp->sc->fbi != NULL && ISGRAPHSC(scp)) {
            if (*(int *)data == V_DISPLAY_ON)
                sc_stop_scrn_saver(scp->sc);
            else
                sc_start_scrn_saver(scp->sc);
            ret = 0;
        } else {
            ret = ENODEV;
        }
        lwkt_reltoken(&vga_token);
        return ret;

    case FBIO_GETPALETTE:
    case FBIO_SETPALETTE:
    case FBIOPUTCMAP:
    case FBIOGETCMAP:
    case FBIOGTYPE:
    case FBIOGATTR:
    case FBIOSVIDEO:
    case FBIOGVIDEO:
    case FBIOSCURSOR:
    case FBIOGCURSOR:
    case FBIOSCURPOS:
    case FBIOGCURPOS:
    case FBIOGCURMAX:
        if (scp != scp->sc->cur_scp) {
            lwkt_reltoken(&vga_token);
            return ENODEV;      /* XXX */
        }
        if (scp->sc->fbi != NULL) {
            if (cmd == FBIOGTYPE) {
                ((struct fbtype *)data)->fb_type = FBTYPE_DUMBFB;
                ((struct fbtype *)data)->fb_height = scp->sc->fbi->height;
                ((struct fbtype *)data)->fb_width = scp->sc->fbi->width;
                ((struct fbtype *)data)->fb_depth = scp->sc->fbi->depth;
                ((struct fbtype *)data)->fb_cmsize = 0;
                ((struct fbtype *)data)->fb_size =
                    scp->sc->fbi->height * scp->sc->fbi->stride;
                ret = 0;
            } else {
                ret = ENODEV;
            }
        } else {
            ret = fb_ioctl(adp, cmd, data);
        }
        lwkt_reltoken(&vga_token);
        return ret;

    case KDSETMODE:             /* set current mode of this (virtual) console */
        switch (*(int *)data) {
        case KD_TEXT:           /* switch to TEXT (known) mode */
            /*
             * If scp->mode is of graphics modes, we don't know which
             * text mode to switch back to...
             */
            if (scp->status & GRAPHICS_MODE) {
                lwkt_reltoken(&vga_token);
                return EINVAL;
            }
            /* restore fonts & palette ! */
#if 0
#ifndef SC_NO_FONT_LOADING
            if (scp->sc->fbi == NULL && ISFONTAVAIL(adp->va_flags)
                && !(scp->status & (GRAPHICS_MODE | PIXEL_MODE))) {
                /*
                 * FONT KLUDGE
                 * Don't load fonts for now... XXX
                 */
                if (scp->sc->fonts_loaded & FONT_8)
                    sc_load_font(scp, 0, 8, scp->sc->font_8, 0, 256);
                if (scp->sc->fonts_loaded & FONT_14)
                    sc_load_font(scp, 0, 14, scp->sc->font_14, 0, 256);
                if (scp->sc->fonts_loaded & FONT_16)
                    sc_load_font(scp, 0, 16, scp->sc->font_16, 0, 256);
            }
#endif /* SC_NO_FONT_LOADING */
#endif

            if (scp->sc->fbi == NULL)
                load_palette(adp, scp->sc->palette);

            /* move hardware cursor out of the way */
            if (scp->sc->fbi == NULL)
                (*vidsw[adp->va_index]->set_hw_cursor)(adp, -1, -1);
            /* FALL THROUGH */

        case KD_TEXT1:          /* switch to TEXT (known) mode */
            /*
             * If scp->mode is of graphics modes, we don't know which
             * text/pixel mode to switch back to...
             */
            if (scp->status & GRAPHICS_MODE) {
                lwkt_reltoken(&vga_token);
                return EINVAL;
            }
            crit_enter();
            if ((error = sc_clean_up(scp, FALSE))) {
                crit_exit();
                lwkt_reltoken(&vga_token);
                return error;
            }
            scp->status |= UNKNOWN_MODE | MOUSE_HIDDEN;
            crit_exit();
            /* no restore fonts & palette */
            if (scp == scp->sc->cur_scp)
                set_mode(scp);
            sc_clear_screen(scp);
            scp->status &= ~UNKNOWN_MODE;
            lwkt_reltoken(&vga_token);
            return 0;

#ifdef SC_PIXEL_MODE
        case KD_PIXEL:          /* pixel (raster) display */
            if (!(scp->status & (GRAPHICS_MODE | PIXEL_MODE))) {
                lwkt_reltoken(&vga_token);
                return EINVAL;
            }
            if (scp->sc->fbi != NULL) {
                lwkt_reltoken(&vga_token);
                return ENODEV;
            }
            if (scp->status & GRAPHICS_MODE) {
                lwkt_reltoken(&vga_token);
                return sc_set_pixel_mode(scp, tp, scp->xsize, scp->ysize, 
                                         scp->font_height);
            }
            crit_enter();
            if ((error = sc_clean_up(scp, FALSE))) {
                crit_exit();
                lwkt_reltoken(&vga_token);
                return error;
            }
            scp->status |= (UNKNOWN_MODE | PIXEL_MODE | MOUSE_HIDDEN);
            crit_exit();
            if (scp == scp->sc->cur_scp) {
                set_mode(scp);
                load_palette(adp, scp->sc->palette);
            }
            sc_clear_screen(scp);
            scp->status &= ~UNKNOWN_MODE;
            lwkt_reltoken(&vga_token);
            return 0;
#endif /* SC_PIXEL_MODE */

        case KD_GRAPHICS:       /* switch to GRAPHICS (unknown) mode */
            crit_enter();
            if ((error = sc_clean_up(scp, FALSE))) {
                crit_exit();
                lwkt_reltoken(&vga_token);
                return error;
            }
            scp->status |= UNKNOWN_MODE | MOUSE_HIDDEN;
            crit_exit();
            lwkt_reltoken(&vga_token);
            return 0;

        default:
            lwkt_reltoken(&vga_token);
            return EINVAL;
        }
        /* NOT REACHED */

#ifdef SC_PIXEL_MODE
    case KDRASTER:              /* set pixel (raster) display mode */
        if (scp->sc->fbi != NULL || ISUNKNOWNSC(scp) || ISTEXTSC(scp)) {
            lwkt_reltoken(&vga_token);
            return ENODEV;
        }
        lwkt_reltoken(&vga_token);
        return sc_set_pixel_mode(scp, tp, ((int *)data)[0], ((int *)data)[1], 
                                 ((int *)data)[2]);
#endif /* SC_PIXEL_MODE */

    case KDGETMODE:             /* get current mode of this (virtual) console */
        /* 
         * From the user program's point of view, KD_PIXEL is the same 
         * as KD_TEXT... 
         */
        *data = ISGRAPHSC(scp) ? KD_GRAPHICS : KD_TEXT;
        lwkt_reltoken(&vga_token);
        return 0;

    case KDSBORDER:             /* set border color of this (virtual) console */
        /* Only values in the range [0..15] allowed */
        if (*(int *)data < 0 || *(int *)data > 15) {
                lwkt_reltoken(&vga_token);
                return EINVAL;
        }
        scp->border = *(int *)data;
        if (scp == scp->sc->cur_scp)
            sc_set_border(scp, scp->border);
        lwkt_reltoken(&vga_token);
        return 0;
    }

    lwkt_reltoken(&vga_token);
    return ENOIOCTL;
}

static LIST_HEAD(, sc_renderer) sc_rndr_list = 
        LIST_HEAD_INITIALIZER(sc_rndr_list);

int
sc_render_add(sc_renderer_t *rndr)
{
        LIST_INSERT_HEAD(&sc_rndr_list, rndr, link);
        return 0;
}

int
sc_render_remove(sc_renderer_t *rndr)
{
        /*
        LIST_REMOVE(rndr, link);
        */
        return EBUSY;   /* XXX */
}

sc_rndr_sw_t *
sc_render_match(scr_stat *scp, char *name, int model)
{
        const sc_renderer_t **list;
        const sc_renderer_t *p;

        if (!LIST_EMPTY(&sc_rndr_list)) {
                LIST_FOREACH(p, &sc_rndr_list, link) {
                        if ((strcmp(p->name, name) == 0) &&
                            (model == p->model)) {
                                scp->status &=
                                    ~(VR_CURSOR_ON | VR_CURSOR_BLINK);
                                return p->rndrsw;
                        }
                }
        } else {
                SET_FOREACH(list, scrndr_set) {
                        p = *list;
                        if ((strcmp(p->name, name) == 0) &&
                            (model == p->model)) {
                                scp->status &=
                                    ~(VR_CURSOR_ON | VR_CURSOR_BLINK);
                                return p->rndrsw;
                        }
                }
        }

        return NULL;
}

#define VIRTUAL_TTY(sc, x) ((SC_DEV((sc),(x)) != NULL) ?        \
        (SC_DEV((sc),(x))->si_tty) : NULL)

void
sc_update_render(scr_stat *scp)
{
        sc_rndr_sw_t *rndr;
        sc_term_sw_t *sw;
        struct tty *tp;
        int prev_ysize, new_ysize;
#ifndef SC_NO_HISTORY
        int old_xpos, old_ypos;
#endif
        int error;

        sw = scp->tsw;
        if (sw == NULL) {
                return;
        }

        if (scp->rndr == NULL)
                return;

        if (scp->fbi_generation == scp->sc->fbi_generation)
                return;

        crit_enter();
        scp->fbi_generation = scp->sc->fbi_generation;
        /* Needed in case we are implicitly leaving PIXEL_MODE here */
        if (scp->model != V_INFO_MM_OTHER)
                scp->model = V_INFO_MM_TEXT;
        rndr = NULL;
        if (strcmp(sw->te_renderer, "*") != 0) {
                rndr = sc_render_match(scp, sw->te_renderer, scp->model);
        }
        if (rndr == NULL && scp->sc->fbi != NULL) {
                rndr = sc_render_match(scp, "kms", scp->model);
        }
        if (rndr == NULL) {     /* this shouldn't happen */
                rndr = sc_render_match(scp, scp->sc->adp->va_name, scp->model);
                if (rndr != NULL)
                        scp->rndr = rndr;
                crit_exit();
                return;
        }

        scp->rndr = rndr;
        /* Mostly copied from sc_set_text_mode */
        if ((error = sc_clean_up(scp, FALSE))) {
                crit_exit();
                return;
        }
        new_ysize = 0;
#ifndef SC_NO_HISTORY
        old_xpos = old_ypos = 0;
        if (scp->history != NULL) {
                if (scp->xsize > 0) {
                        old_xpos = scp->xpos;
                        old_ypos = scp->ypos;
                }
                sc_hist_save(scp);
                new_ysize = sc_vtb_rows(scp->history);
        }
#endif
        prev_ysize = scp->ysize;
        scp->status |= MOUSE_HIDDEN;
        if (scp->status & GRAPHICS_MODE) {
                /*
                 * We don't handle GRAPHICS_MODE at all when using a KMS
                 * framebuffer, so silently switch to UNKNOWN_MODE then.
                 */
                scp->status |= UNKNOWN_MODE;
                scp->status &= ~GRAPHICS_MODE;
        }
        /* Implicitly leave PIXEL_MODE, but stay in UNKNOWN mode */
        scp->status &= ~(PIXEL_MODE | MOUSE_VISIBLE);
        scp->xpixel = scp->sc->fbi->width;
        scp->ypixel = scp->sc->fbi->height;

        /*
         * Assume square pixels for now
         */
        sc_font_scale(scp, 0, 0);

        DPRINTF(1, ("kms console: scale-to %dx%d cols=%d rows=%d\n",
                scp->blk_width, scp->blk_height, scp->xsize, scp->ysize));

        /* allocate buffers */
        sc_alloc_scr_buffer(scp, TRUE, TRUE);
        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, new_ysize, prev_ysize, FALSE);
        if (scp->history != NULL) {
                sc_hist_getback(scp, prev_ysize);
                sc_move_cursor(scp, old_xpos, old_ypos);
        }
#endif
        crit_exit();
        tp = VIRTUAL_TTY(scp->sc, scp->index);
        if (tp == NULL)
                return;
        if (tp->t_winsize.ws_col != scp->xsize ||
            tp->t_winsize.ws_row != scp->ysize) {
                tp->t_winsize.ws_col = scp->xsize;
                tp->t_winsize.ws_row = scp->ysize;
                pgsignal(tp->t_pgrp, SIGWINCH, 1);
        }
}