/*      $NetBSD: cgfour.c,v 1.52 2026/05/25 13:47:08 christos Exp $     */

/*-
 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Lawrence Berkeley Laboratory.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 *      from @(#)cgthree.c      8.2 (Berkeley) 10/30/93
 */

/*
 * Copyright (c) 1995 Theo de Raadt.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 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.
 */

/*
 * color display (cgfour) driver.
 *
 * Does not handle interrupts, even though they can occur.
 *
 * XXX should defer colormap updates to vertical retrace interrupts
 */

#include "wsdisplay.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cgfour.c,v 1.52 2026/05/25 13:47:08 christos Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/tty.h>
#include <sys/conf.h>

#include <machine/autoconf.h>
#include <machine/eeprom.h>

#include <dev/sun/fbio.h>
#include <dev/sun/fbvar.h>
#include <dev/sun/btreg.h>
#include <dev/sun/btvar.h>
#include <dev/sun/pfourreg.h>

#if NWSDISPLAY > 0
#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsdisplay_vconsvar.h>
#include <dev/wsfont/wsfont.h>
#include <dev/rasops/rasops.h>

#include "opt_wsemul.h"
#endif

#define CGFOUR_OVERLAY_SIZE    0x20000
#define CGFOUR_RAM_SIZE                0x100000        /* All our cgfour's are 1MB */

/* per-display variables */
struct cgfour_softc {
        struct fbdevice sc_fb;          /* frame buffer device */
        bus_space_tag_t sc_bustag;
        bus_addr_t      sc_paddr;       /* phys address for device mmap() */

        volatile struct fbcontrol *sc_fbc;      /* Brooktree registers */
#if NWSDISPLAY > 0
       uint32_t sc_width;
       uint32_t sc_height;             /* display width / height */
       uint32_t sc_stride;
       int sc_mode;
       struct vcons_data sc_vd;
       char *sc_overlay;
       char *sc_enable;
#endif
        union bt_cmap   sc_cmap;        /* Brooktree color map */
};

/* autoconfiguration driver */
static int      cgfourmatch(device_t, cfdata_t, void *);
static void     cgfourattach(device_t, device_t, void *);

#if defined(SUN4)
static void     cgfourunblank(device_t);
#endif

static int      cg4_pfour_probe(void *, void *);

CFATTACH_DECL_NEW(cgfour, sizeof(struct cgfour_softc),
    cgfourmatch, cgfourattach, NULL, NULL);

extern struct cfdriver cgfour_cd;

dev_type_open(cgfouropen);
dev_type_ioctl(cgfourioctl);
dev_type_mmap(cgfourmmap);

const struct cdevsw cgfour_cdevsw = {
        .d_open = cgfouropen,
        .d_close = nullclose,
        .d_read = noread,
        .d_write = nowrite,
        .d_ioctl = cgfourioctl,
        .d_stop = nostop,
        .d_tty = notty,
        .d_poll = nopoll,
        .d_mmap = cgfourmmap,
        .d_kqfilter = nokqfilter,
        .d_discard = nodiscard,
        .d_flag = 0
};

#if defined(SUN4)
/* frame buffer generic driver */
static struct fbdriver cgfourfbdriver = {
        cgfourunblank, cgfouropen, nullclose, cgfourioctl, nopoll,
        cgfourmmap, nokqfilter
};

static void cgfourloadcmap(struct cgfour_softc *, int, int);
static int cgfour_get_video(struct cgfour_softc *);
static void cgfour_set_video(struct cgfour_softc *, int);

#if NWSDISPLAY > 0
static void cgfour_setup_palette(struct cgfour_softc *);

struct wsscreen_descr cgfour_defaultscreen = {
       "std",
       0, 0,   /* will be filled in -- XXX shouldn't, it's global */
       NULL,   /* textops */
       8, 16,  /* font width/height */
       WSSCREEN_WSCOLORS,      /* capabilities */
       NULL    /* modecookie */
};

static int cgfour_ioctl(void *, void *, u_long, void *, int, struct lwp *);
static paddr_t cgfour_mmap(void *, void *, off_t, int);
static void cgfour_init_screen(void *, struct vcons_screen *, int, long *);
static void cgfour_clear_screen(struct cgfour_softc *, int);

static int cgfour_putcmap(struct cgfour_softc *, struct wsdisplay_cmap *);
static int cgfour_getcmap(struct cgfour_softc *, struct wsdisplay_cmap *);

struct wsdisplay_accessops cgfour_accessops = {
       .ioctl = cgfour_ioctl,
       .mmap = cgfour_mmap,
       .alloc_screen = NULL,
       .free_screen = NULL,
       .show_screen = NULL,
       .load_font = NULL,
       .pollc = NULL,
       .scroll = NULL
};

const struct wsscreen_descr *_cgfour_scrlist[] = {
       &cgfour_defaultscreen
};

struct wsscreen_list cgfour_screenlist = {
       .nscreens = sizeof(_cgfour_scrlist) / sizeof(struct wsscreen_descr *),
       .screens = _cgfour_scrlist
};

static struct vcons_screen cgfour_console_screen;
#endif /* NWSDISPLAY > 0 */
#endif /* SUN4 */
/*
 * Match a cgfour.
 */
static int
cgfourmatch(device_t parent, cfdata_t cf, void *aux)
{
        union obio_attach_args *uoba = aux;
        struct obio4_attach_args *oba;

        if (uoba->uoba_isobio4 == 0)
                return (0);

        oba = &uoba->uoba_oba4;
        return (bus_space_probe(oba->oba_bustag, oba->oba_paddr,
                                4,      /* probe size */
                                0,      /* offset */
                                0,      /* flags */
                                cg4_pfour_probe, NULL));
}

static int
cg4_pfour_probe(void *vaddr, void *arg)
{

        return (fb_pfour_id(vaddr) == PFOUR_ID_COLOR8P1);
}

/*
 * Attach a display.  We need to notice if it is the console, too.
 */
static void
cgfourattach(device_t parent, device_t self, void *aux)
{
#if defined(SUN4)
        struct cgfour_softc *sc = device_private(self);
        union obio_attach_args *uoba = aux;
        struct obio4_attach_args *oba = &uoba->uoba_oba4;
        bus_space_handle_t bh;
        volatile struct bt_regs *bt;
        struct fbdevice *fb = &sc->sc_fb;
        int i, isconsole;
#if NWSDISPLAY > 0
       struct wsemuldisplaydev_attach_args wsemul_aa;
       struct rasops_info *ri = &cgfour_console_screen.scr_ri;
       unsigned long defattr = 0;
#endif
        sc->sc_bustag = oba->oba_bustag;
        sc->sc_paddr = (bus_addr_t)oba->oba_paddr;

        /* Map the pfour register. */
        if (bus_space_map(oba->oba_bustag, oba->oba_paddr,
                          sizeof(uint32_t),
                          BUS_SPACE_MAP_LINEAR,
                          &bh) != 0) {
                printf("%s: cannot map control registers\n",
                        device_xname(self));
                return;
        }
        fb->fb_pfour = (volatile uint32_t *)bh;

        fb->fb_driver = &cgfourfbdriver;
        fb->fb_device = self;
        fb->fb_type.fb_type = FBTYPE_SUN4COLOR;
        fb->fb_flags = device_cfdata(self)->cf_flags & FB_USERMASK;
        fb->fb_flags |= FB_PFOUR;


        fb->fb_type.fb_depth = 8;
        fb_setsize_eeprom(fb, fb->fb_type.fb_depth, 1152, 900);

        fb->fb_type.fb_cmsize = 256;
        fb->fb_type.fb_size = CGFOUR_RAM_SIZE;
        printf(": cgfour/p4, %d x %d",
                fb->fb_type.fb_width, fb->fb_type.fb_height);

        isconsole = 0;

        if (CPU_ISSUN4) {
                struct eeprom *eep = (struct eeprom *)eeprom_va;

                /*
                 * Assume this is the console if there's no eeprom info
                 * to be found.
                 */
                if (eep == NULL || eep->eeConsole == EE_CONS_P4OPT)
                        isconsole = fb_is_console(0);
        }

        /*
         * When the ROM has mapped in a cgfour display, the address
         * maps only the video RAM, so in any case we have to map the
         * registers ourselves.
         */

        if (isconsole) {
               /* Map the framebuffers. */
               if (bus_space_map(oba->oba_bustag,
                           oba->oba_paddr + PFOUR_COLOR_OFF_OVERLAY,
                           CGFOUR_OVERLAY_SIZE,
                           BUS_SPACE_MAP_LINEAR,
                           &bh) != 0) {
                       printf("%s: cannot map overlay plane\n",
                           device_xname(self));
               return;
               }
               sc->sc_overlay = (char *)bh;

               if (bus_space_map(oba->oba_bustag,
                           oba->oba_paddr + PFOUR_COLOR_OFF_ENABLE,
                           CGFOUR_OVERLAY_SIZE,
                           BUS_SPACE_MAP_LINEAR,
                           &bh) != 0) {
                       printf("%s: cannot map enable plane\n",
                           device_xname(self));
                       return;
               }
               sc->sc_enable  = (char *)bh;

               if (bus_space_map(oba->oba_bustag,
                           oba->oba_paddr + PFOUR_COLOR_OFF_COLOR,
                           CGFOUR_RAM_SIZE,
                           BUS_SPACE_MAP_LINEAR,
                           &bh) != 0) {
                       printf("%s: cannot map pixels\n",
                           device_xname(self));
                       return;
               }
               fb->fb_pixels = (char *)bh;
        }

        /* Map the Brooktree. */
        if (bus_space_map(oba->oba_bustag,
                          oba->oba_paddr + PFOUR_COLOR_OFF_CMAP,
                          sizeof(struct fbcontrol),
                          BUS_SPACE_MAP_LINEAR,
                          &bh) != 0) {
                printf("%s: cannot map control registers\n",
                        device_xname(self));
                return;
        }
        sc->sc_fbc = (volatile struct fbcontrol *)bh;

        /* grab initial (current) color map */
        bt = &sc->sc_fbc->fbc_dac;
        bt->bt_addr = 0;
        for (i = 0; i < 256 * 3 / 4; i++)
                ((char *)&sc->sc_cmap)[i] = bt->bt_cmap >> 24;

        BT_INIT(bt, 24);

        if (isconsole) {
                printf(" (console)\n");
        } else
                printf("\n");

        /*
         * Even though we're not using rconsole, we'd still like
         * to notice if we're the console framebuffer.
         */
        fb_attach(fb, isconsole);

#if NWSDISPLAY > 0
       sc->sc_width = fb->fb_type.fb_width;
       sc->sc_stride = fb->fb_type.fb_width;
       sc->sc_height = fb->fb_type.fb_height;

       /* setup rasops and so on for wsdisplay */
       sc->sc_mode = WSDISPLAYIO_MODE_EMUL;

       vcons_init(&sc->sc_vd, sc, &cgfour_defaultscreen, &cgfour_accessops);
       sc->sc_vd.init_screen = cgfour_init_screen;

       if (isconsole) {
               /* we mess with cgfour_console_screen only once */
               vcons_init_screen(&sc->sc_vd, &cgfour_console_screen, 1,
                   &defattr);
               cgfour_clear_screen(sc, (defattr >> 16) & 0xff);
               cgfour_console_screen.scr_flags |= VCONS_SCREEN_IS_STATIC;

               cgfour_defaultscreen.textops = &ri->ri_ops;
               cgfour_defaultscreen.capabilities = ri->ri_caps;
               cgfour_defaultscreen.nrows = ri->ri_rows;
               cgfour_defaultscreen.ncols = ri->ri_cols;
               SCREEN_VISIBLE(&cgfour_console_screen);
               sc->sc_vd.active = &cgfour_console_screen;
               wsdisplay_cnattach(&cgfour_defaultscreen, ri, 0, 0, defattr);
               vcons_replay_msgbuf(&cgfour_console_screen);
       } else {
               /*
                * we're not the console so we just clear the screen and don't
                * set up any sort of text display
                */
       }

       /* Initialize the default color map. */
       cgfour_setup_palette(sc);

       wsemul_aa.scrdata = &cgfour_screenlist;
       wsemul_aa.console = isconsole;
       wsemul_aa.accessops = &cgfour_accessops;
       wsemul_aa.accesscookie = &sc->sc_vd;
       config_found(self, &wsemul_aa, wsemuldisplaydevprint,
           CFARGS_NONE);
#endif /* NWSDISPLAY > 0 */
#endif /* SUN4 */
}

int
cgfouropen(dev_t dev, int flags, int mode, struct lwp *l)
{
        int unit = minor(dev);

        if (device_lookup(&cgfour_cd, unit) == NULL)
                return (ENXIO);
        return (0);
}

int
cgfourioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l)
{
#if defined(SUN4)
        struct cgfour_softc *sc = device_lookup_private(&cgfour_cd, minor(dev));
        struct fbgattr *fba;
        int error;

        switch (cmd) {

        case FBIOGTYPE:
                *(struct fbtype *)data = sc->sc_fb.fb_type;
                break;

        case FBIOGATTR:
                fba = (struct fbgattr *)data;
                fba->real_type = sc->sc_fb.fb_type.fb_type;
                fba->owner = 0;         /* XXX ??? */
                fba->fbtype = sc->sc_fb.fb_type;
                fba->sattr.flags = 0;
                fba->sattr.emu_type = sc->sc_fb.fb_type.fb_type;
                fba->sattr.dev_specific[0] = -1;
                fba->emu_types[0] = sc->sc_fb.fb_type.fb_type;
                fba->emu_types[1] = -1;
                break;

        case FBIOGETCMAP:
#define p ((struct fbcmap *)data)
                return (bt_getcmap(p, &sc->sc_cmap, 256, 1));

        case FBIOPUTCMAP:
                /* copy to software map */
                error = bt_putcmap(p, &sc->sc_cmap, 256, 1);
                if (error)
                        return (error);
                /* now blast them into the chip */
                /* XXX should use retrace interrupt */
                cgfourloadcmap(sc, p->index, p->count);
#undef p
                break;

        case FBIOGVIDEO:
                *(int *)data = cgfour_get_video(sc);
                break;

        case FBIOSVIDEO:
                cgfour_set_video(sc, *(int *)data);
                break;

        default:
                return (ENOTTY);
        }
#endif /* SUN4 */

        return (0);
}

/*
 * Return the address that would map the given device at the given
 * offset, allowing for the given protection, or return -1 for error.
 *
 * the cg4 maps its overlay plane for 128K, followed by the enable
 * plane for 128K, followed by the colour plane (for as much colour
 * as their is.)
 *
 * As well, mapping at an offset of 0x04000000 causes the cg4 to map
 * only its colour plane, at 0.
 */
paddr_t
cgfourmmap(dev_t dev, off_t off, int prot)
{
        struct cgfour_softc *sc = device_lookup_private(&cgfour_cd, minor(dev));
        off_t poff;

#define START_ENABLE    (128*1024)
#define START_COLOR     ((128*1024) + (128*1024))
#define COLOR_SIZE      (sc->sc_fb.fb_type.fb_width * \
                            sc->sc_fb.fb_type.fb_height)
#define END_COLOR       (START_COLOR + COLOR_SIZE)
#define NOOVERLAY       (0x04000000)

        if (off & PGOFSET)
                panic("cgfourmap");

        if (off < 0)
                return (-1);
        else if ((u_int)off >= NOOVERLAY) {
                off -= NOOVERLAY;

                /*
                 * X11 maps a huge chunk of the frame buffer; far more than
                 * there really is. We compensate by double-mapping the
                 * first page for as many other pages as it wants
                 */
                while ((u_int)off >= COLOR_SIZE)
                        off -= COLOR_SIZE;      /* XXX thorpej ??? */

                poff = off + PFOUR_COLOR_OFF_COLOR;
        } else if ((u_int)off < START_ENABLE) {
                /*
                 * in overlay plane
                 */
                poff = PFOUR_COLOR_OFF_OVERLAY + off;
        } else if ((u_int)off < START_COLOR) {
                /*
                 * in enable plane
                 */
                poff = (off - START_ENABLE) + PFOUR_COLOR_OFF_ENABLE;
        } else if ((u_int)off < sc->sc_fb.fb_type.fb_size) {
                /*
                 * in colour plane
                 */
                poff = (off - START_COLOR) + PFOUR_COLOR_OFF_COLOR;
        } else
                return (-1);

        return (bus_space_mmap(sc->sc_bustag,
                sc->sc_paddr, poff,
                prot, BUS_SPACE_MAP_LINEAR));
}

#if defined(SUN4)
/*
 * Undo the effect of an FBIOSVIDEO that turns the video off.
 */
static void
cgfourunblank(device_t dev)
{

        cgfour_set_video(device_private(dev), 1);
}

static int
cgfour_get_video(struct cgfour_softc *sc)
{

        return (fb_pfour_get_video(&sc->sc_fb));
}

static void
cgfour_set_video(struct cgfour_softc *sc, int enable)
{

        fb_pfour_set_video(&sc->sc_fb, enable);
}

/*
 * Load a subset of the current (new) colormap into the Brooktree DAC.
 */
static void
cgfourloadcmap(struct cgfour_softc *sc, int start, int ncolors)
{
        volatile struct bt_regs *bt;
        u_int *ip, i;
        int count;

        ip = &sc->sc_cmap.cm_chip[BT_D4M3(start)];      /* start/4 * 3 */
        count = BT_D4M3(start + ncolors - 1) - BT_D4M3(start) + 3;
        bt = &sc->sc_fbc->fbc_dac;
        bt->bt_addr = BT_D4M4(start) << 24;
        while (--count >= 0) {
                i = *ip++;
                /* hardware that makes one want to pound boards with hammers */
                bt->bt_cmap = i;
                bt->bt_cmap = i << 8;
                bt->bt_cmap = i << 16;
                bt->bt_cmap = i << 24;
        }
}

#if NWSDISPLAY > 0
static void
cgfour_setup_palette(struct cgfour_softc *sc)
{
       int i, j;

       j = 0;
       for (i = 0; i < 256; i++) {
               sc->sc_cmap.cm_map[i][0] = rasops_cmap[j];
               j++;
               sc->sc_cmap.cm_map[i][1] = rasops_cmap[j];
               j++;
               sc->sc_cmap.cm_map[i][2] = rasops_cmap[j];
               j++;
       }
       cgfourloadcmap(sc, 0, 256);
}

static int
cgfour_ioctl(void *v, void *vs, u_long cmd, void *data, int flag,
    struct lwp *l)
{
       /* we'll probably need to add more stuff here */
       struct vcons_data *vd = v;
       struct cgfour_softc *sc = vd->cookie;
       struct wsdisplay_fbinfo *wdf;
       struct vcons_screen *ms = sc->sc_vd.active;
       struct rasops_info *ri = &ms->scr_ri;
       switch (cmd) {
               case WSDISPLAYIO_GTYPE:
                       *(u_int *)data = WSDISPLAY_TYPE_SUNTCX; /* XXX */
                       return 0;
               case WSDISPLAYIO_GINFO:
                       wdf = (void *)data;
                       wdf->height = ri->ri_height;
                       wdf->width = ri->ri_width;
                       wdf->depth = 8;
                       wdf->cmsize = 256;
                       return 0;

               case WSDISPLAYIO_GETCMAP:
                       return cgfour_getcmap(sc,
                           (struct wsdisplay_cmap *)data);
               case WSDISPLAYIO_PUTCMAP:
                       return cgfour_putcmap(sc,
                           (struct wsdisplay_cmap *)data);

               case WSDISPLAYIO_SMODE:
                       {
                               int new_mode = *(int *)data;

                               if (new_mode != sc->sc_mode) {
                                       sc->sc_mode = new_mode;
                                       if (new_mode == WSDISPLAYIO_MODE_EMUL) {
                                               cgfour_setup_palette(sc);
                                               cgfour_clear_screen(sc, 0xff);
                                               vcons_redraw_screen(ms);
                                       }
                               }
                       }
                       return 0;
               case WSDISPLAYIO_GET_FBINFO:
                       {
                               struct wsdisplayio_fbinfo *fbi = data;

                               return wsdisplayio_get_fbinfo(&ms->scr_ri, fbi);
                       }
       }
       return EPASSTHROUGH;
}

static paddr_t
cgfour_mmap(void *v, void *vs, off_t offset, int prot)
{
       struct vcons_data *vd = v;
       struct cgfour_softc *sc = vd->cookie;
       paddr_t cookie = -1;

       switch (sc->sc_mode) {
       case WSDISPLAYIO_MODE_DUMBFB:
               if (offset >= 0 && offset <= sc->sc_fb.fb_type.fb_size) {
                       cookie = bus_space_mmap(sc->sc_bustag,
                           sc->sc_paddr, PFOUR_COLOR_OFF_COLOR + offset,
                           prot, BUS_SPACE_MAP_LINEAR);
               }
               break;
       default:
               break;
       }

       return cookie;
}

static int
cgfour_putcmap(struct cgfour_softc *sc, struct wsdisplay_cmap *cm)
{
       u_int index = cm->index;
       u_int count = cm->count;
       int error,i;
       if (index >= 256 || count > 256 || index + count > 256)
               return EINVAL;

       for (i = 0; i < count; i++)
       {
               error = copyin(&cm->red[i],
                   &sc->sc_cmap.cm_map[index + i][0], 1);
               if (error)
                       return error;
               error = copyin(&cm->green[i],
                   &sc->sc_cmap.cm_map[index + i][1],
                   1);
               if (error)
                       return error;
               error = copyin(&cm->blue[i],
                   &sc->sc_cmap.cm_map[index + i][2], 1);
               if (error)
                       return error;
       }
       cgfourloadcmap(sc, index, count);

       return 0;
}

static int
cgfour_getcmap(struct cgfour_softc *sc, struct wsdisplay_cmap *cm)
{
       u_int index = cm->index;
       u_int count = cm->count;
       int error,i;

       if (index >= 256 || count > 256 || index + count > 256)
               return EINVAL;

       for (i = 0; i < count; i++)
       {
               error = copyout(&sc->sc_cmap.cm_map[index + i][0],
                   &cm->red[i], 1);
               if (error)
                       return error;
               error = copyout(&sc->sc_cmap.cm_map[index + i][1],
                   &cm->green[i], 1);
               if (error)
                       return error;
               error = copyout(&sc->sc_cmap.cm_map[index + i][2],
                   &cm->blue[i], 1);
               if (error)
                       return error;
       }

       return 0;
}

static void
cgfour_init_screen(void *cookie, struct vcons_screen *scr,
    int existing, long *defattr)
{
       struct cgfour_softc *sc = cookie;
       struct rasops_info *ri = &scr->scr_ri;

       scr->scr_flags |= VCONS_DONT_READ;

       ri->ri_depth = 8;
       ri->ri_width = sc->sc_width;
       ri->ri_height = sc->sc_height;
       ri->ri_stride = sc->sc_stride;
       ri->ri_flg = RI_CENTER;

       ri->ri_bits = sc->sc_fb.fb_pixels;

       rasops_init(ri, 0, 0);
       ri->ri_caps = WSSCREEN_WSCOLORS | WSSCREEN_REVERSE;
       rasops_reconfig(ri, sc->sc_height / ri->ri_font->fontheight,
           sc->sc_width / ri->ri_font->fontwidth);

       ri->ri_hw = scr;
}

static void
cgfour_clear_screen(struct cgfour_softc *sc, int bg)
{
       char *bits;

       /* We can write a maximum of 4 bytes at a time to the framebuffer. */
       for (bits = (char *)sc->sc_enable;
           bits < (char *)sc->sc_enable + CGFOUR_OVERLAY_SIZE;
           bits += 4)
               memset(bits,  0x00, 4);

       for (bits = (char *)sc->sc_fb.fb_pixels;
           bits < (char *)sc->sc_fb.fb_pixels + sc->sc_stride * sc->sc_height;
           bits += 4)
               memset(bits, bg, 4);
}
#endif /* NWSDISPLAY > 0 */
#endif /* SUN4 */