d6dfd783d9
variant of the CG4 (the one with the AMD colormap DACs). This has been tested only on the "Type B" H/W at this point (Brooktree DACs). Thanks to Ezra Story and Scott Ellis for the "Type A" support.
617 lines
15 KiB
C
617 lines
15 KiB
C
/* $NetBSD: cg4.c,v 1.11 1996/10/29 19:54:19 gwr Exp $ */
|
|
|
|
/*
|
|
* 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. 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, Berkeley and its contributors.
|
|
* 4. 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
|
|
*/
|
|
|
|
/*
|
|
* color display (cg4) driver.
|
|
*
|
|
* Credits, history:
|
|
* Gordon Ross created this driver based on the cg3 driver from
|
|
* the sparc port as distributed in BSD 4.4 Lite, but included
|
|
* support for only the "type B" adapter (Brooktree DACs).
|
|
* Ezra Story added support for the "type A" (AMD DACs).
|
|
*
|
|
* Todo:
|
|
* Make this driver handle video interrupts.
|
|
* Defer colormap updates to vertical retrace interrupts.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/device.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/tty.h>
|
|
|
|
#include <vm/vm.h>
|
|
|
|
#include <machine/cpu.h>
|
|
#include <machine/fbio.h>
|
|
#include <machine/autoconf.h>
|
|
#include <machine/pmap.h>
|
|
|
|
#include "fbvar.h"
|
|
#include "btreg.h"
|
|
#include "btvar.h"
|
|
#include "cg4reg.h"
|
|
|
|
#define CG4_MMAP_SIZE (CG4_OVERLAY_SIZE + CG4_ENABLE_SIZE + CG4_PIXMAP_SIZE)
|
|
|
|
extern unsigned char cpu_machine_id;
|
|
|
|
#define CMAP_SIZE 256
|
|
struct soft_cmap {
|
|
u_char r[CMAP_SIZE];
|
|
u_char g[CMAP_SIZE];
|
|
u_char b[CMAP_SIZE];
|
|
};
|
|
|
|
/* per-display variables */
|
|
struct cg4_softc {
|
|
struct device sc_dev; /* base device */
|
|
struct fbdevice sc_fb; /* frame buffer device */
|
|
int sc_cg4type; /* A or B */
|
|
void *sc_va_cmap; /* Colormap h/w (mapped KVA) */
|
|
int sc_pa_overlay; /* phys. addr. of overlay plane */
|
|
int sc_pa_enable; /* phys. addr. of enable plane */
|
|
int sc_pa_pixmap; /* phys. addr. of color plane */
|
|
int sc_blanked; /* true if blanked */
|
|
|
|
union bt_cmap *sc_btcm; /* Brooktree color map */
|
|
struct soft_cmap sc_cmap; /* Generic soft colormap. */
|
|
};
|
|
|
|
/* autoconfiguration driver */
|
|
static void cg4attach __P((struct device *, struct device *, void *));
|
|
static int cg4match __P((struct device *, void *, void *));
|
|
|
|
struct cfattach cgfour_ca = {
|
|
sizeof(struct cg4_softc), cg4match, cg4attach
|
|
};
|
|
|
|
struct cfdriver cgfour_cd = {
|
|
NULL, "cgfour", DV_DULL
|
|
};
|
|
|
|
/* frame buffer generic driver */
|
|
int cg4open(), cg4close(), cg4mmap();
|
|
|
|
static int cg4gattr __P((struct fbdevice *, struct fbgattr *));
|
|
static int cg4gvideo __P((struct fbdevice *, int *));
|
|
static int cg4svideo __P((struct fbdevice *, int *));
|
|
static int cg4getcmap __P((struct fbdevice *, struct fbcmap *));
|
|
static int cg4putcmap __P((struct fbdevice *, struct fbcmap *));
|
|
|
|
static void cg4a_init __P((struct cg4_softc *));
|
|
static void cg4a_svideo __P((struct cg4_softc *, int));
|
|
static void cg4a_ldcmap __P((struct cg4_softc *));
|
|
|
|
static void cg4b_init __P((struct cg4_softc *));
|
|
static void cg4b_svideo __P((struct cg4_softc *, int));
|
|
static void cg4b_ldcmap __P((struct cg4_softc *));
|
|
|
|
static struct fbdriver cg4_fbdriver = {
|
|
cg4open, cg4close, cg4mmap, cg4gattr,
|
|
cg4gvideo, cg4svideo,
|
|
cg4getcmap, cg4putcmap };
|
|
|
|
/*
|
|
* Match a cg4.
|
|
*/
|
|
static int
|
|
cg4match(parent, vcf, args)
|
|
struct device *parent;
|
|
void *vcf, *args;
|
|
{
|
|
struct confargs *ca = args;
|
|
int paddr;
|
|
|
|
/* XXX: Huge hack due to lack of probe info... */
|
|
/* XXX: Machines that might have a cg4 (gag). */
|
|
/* XXX: Need info on the "P4" register... */
|
|
switch (cpu_machine_id) {
|
|
|
|
case SUN3_MACH_110:
|
|
/* XXX: Assume type A. */
|
|
if (ca->ca_paddr == -1)
|
|
ca->ca_paddr = CG4A_DEF_BASE;
|
|
if (bus_peek(ca->ca_bustype, ca->ca_paddr, 1) == -1)
|
|
return (0);
|
|
if (bus_peek(BUS_OBIO, CG4A_OBIO_CMAP, 1) == -1)
|
|
return (0);
|
|
break;
|
|
|
|
case SUN3_MACH_60:
|
|
/* XXX: Assume type A. */
|
|
if (ca->ca_paddr == -1)
|
|
ca->ca_paddr = CG4B_DEF_BASE;
|
|
paddr = ca->ca_paddr;
|
|
if (bus_peek(ca->ca_bustype, paddr, 1) == -1)
|
|
return (0);
|
|
/* Make sure we're color */
|
|
paddr += CG4B_OFF_PIXMAP;
|
|
if (bus_peek(ca->ca_bustype, paddr, 1) == -1)
|
|
return (0);
|
|
break;
|
|
|
|
default:
|
|
return (0);
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Attach a display. We need to notice if it is the console, too.
|
|
*/
|
|
static void
|
|
cg4attach(parent, self, args)
|
|
struct device *parent, *self;
|
|
void *args;
|
|
{
|
|
struct cg4_softc *sc = (struct cg4_softc *)self;
|
|
struct fbdevice *fb = &sc->sc_fb;
|
|
struct confargs *ca = args;
|
|
struct fbtype *fbt;
|
|
|
|
/* XXX: should do better than this... */
|
|
switch (cpu_machine_id) {
|
|
case SUN3_MACH_110:
|
|
sc->sc_cg4type = CG4_TYPE_A;
|
|
break;
|
|
case SUN3_MACH_60:
|
|
default:
|
|
sc->sc_cg4type = CG4_TYPE_B;
|
|
}
|
|
|
|
fb->fb_driver = &cg4_fbdriver;
|
|
fb->fb_private = sc;
|
|
fb->fb_name = sc->sc_dev.dv_xname;
|
|
|
|
fbt = &fb->fb_fbtype;
|
|
fbt->fb_type = FBTYPE_SUN4COLOR;
|
|
fbt->fb_depth = 8;
|
|
fbt->fb_cmsize = 256;
|
|
|
|
fbt->fb_width = 1152;
|
|
fbt->fb_height = 900;
|
|
fbt->fb_size = CG4_MMAP_SIZE;
|
|
|
|
switch (sc->sc_cg4type) {
|
|
case CG4_TYPE_A: /* Sun3/110 */
|
|
sc->sc_va_cmap = bus_mapin(BUS_OBIO, CG4A_OBIO_CMAP,
|
|
sizeof(struct amd_regs));
|
|
sc->sc_pa_overlay = ca->ca_paddr + CG4A_OFF_OVERLAY;
|
|
sc->sc_pa_enable = ca->ca_paddr + CG4A_OFF_ENABLE;
|
|
sc->sc_pa_pixmap = ca->ca_paddr + CG4A_OFF_PIXMAP;
|
|
sc->sc_btcm = NULL;
|
|
cg4a_init(sc);
|
|
break;
|
|
|
|
case CG4_TYPE_B: /* Sun3/60 */
|
|
default:
|
|
sc->sc_va_cmap = (struct bt_regs *)
|
|
bus_mapin(ca->ca_bustype, ca->ca_paddr,
|
|
sizeof(struct bt_regs *));
|
|
sc->sc_pa_overlay = ca->ca_paddr + CG4B_OFF_OVERLAY;
|
|
sc->sc_pa_enable = ca->ca_paddr + CG4B_OFF_ENABLE;
|
|
sc->sc_pa_pixmap = ca->ca_paddr + CG4B_OFF_PIXMAP;
|
|
sc->sc_btcm = malloc(sizeof(union bt_cmap), M_DEVBUF, M_WAITOK);
|
|
cg4b_init(sc);
|
|
break;
|
|
}
|
|
|
|
printf(" (%dx%d)\n", fbt->fb_width, fbt->fb_height);
|
|
fb_attach(fb, 4);
|
|
}
|
|
|
|
int
|
|
cg4open(dev, flags, mode, p)
|
|
dev_t dev;
|
|
int flags, mode;
|
|
struct proc *p;
|
|
{
|
|
int unit = minor(dev);
|
|
|
|
if (unit >= cgfour_cd.cd_ndevs || cgfour_cd.cd_devs[unit] == NULL)
|
|
return (ENXIO);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
cg4close(dev, flags, mode, p)
|
|
dev_t dev;
|
|
int flags, mode;
|
|
struct proc *p;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
cg4ioctl(dev, cmd, data, flags, p)
|
|
dev_t dev;
|
|
u_long cmd;
|
|
caddr_t data;
|
|
int flags;
|
|
struct proc *p;
|
|
{
|
|
struct cg4_softc *sc = cgfour_cd.cd_devs[minor(dev)];
|
|
|
|
return (fbioctlfb(&sc->sc_fb, cmd, data));
|
|
}
|
|
|
|
/*
|
|
* Return the address that would map the given device at the given
|
|
* offset, allowing for the given protection, or return -1 for error.
|
|
*
|
|
* X11 expects its mmap'd region to look like this:
|
|
* 128k overlay data memory
|
|
* 128k overlay enable bitmap
|
|
* 1024k color memory
|
|
*
|
|
* The hardware really looks like this (starting at ca_paddr)
|
|
* 4 bytes Brooktree DAC registers
|
|
* 2MB-4 gap
|
|
* 128k overlay memory
|
|
* 1920k gap
|
|
* 128k overlay-enable bitmap
|
|
* 1920k gap
|
|
* 1024k color memory
|
|
*/
|
|
int
|
|
cg4mmap(dev, off, prot)
|
|
dev_t dev;
|
|
register int off;
|
|
int prot;
|
|
{
|
|
struct cg4_softc *sc = cgfour_cd.cd_devs[minor(dev)];
|
|
register int physbase;
|
|
|
|
if (off & PGOFSET)
|
|
panic("cg4mmap");
|
|
|
|
if ((unsigned)off >= CG4_MMAP_SIZE)
|
|
return (-1);
|
|
|
|
if (off < 0x40000) {
|
|
if (off < 0x20000) {
|
|
physbase = sc->sc_pa_overlay;
|
|
} else {
|
|
/* enable plane */
|
|
off -= 0x20000;
|
|
physbase = sc->sc_pa_enable;
|
|
}
|
|
} else {
|
|
/* pixel map */
|
|
off -= 0x40000;
|
|
physbase = sc->sc_pa_pixmap;
|
|
}
|
|
|
|
/*
|
|
* I turned on PMAP_NC here to disable the cache as I was
|
|
* getting horribly broken behaviour with it on.
|
|
*/
|
|
return ((physbase + off) | PMAP_NC);
|
|
}
|
|
|
|
/*
|
|
* Internal ioctl functions.
|
|
*/
|
|
|
|
/* FBIOGATTR: */
|
|
static int cg4gattr(fb, fba)
|
|
struct fbdevice *fb;
|
|
struct fbgattr *fba;
|
|
{
|
|
|
|
fba->real_type = fb->fb_fbtype.fb_type;
|
|
fba->owner = 0; /* XXX - TIOCCONS stuff? */
|
|
fba->fbtype = fb->fb_fbtype;
|
|
fba->sattr.flags = 0;
|
|
fba->sattr.emu_type = fb->fb_fbtype.fb_type;
|
|
fba->sattr.dev_specific[0] = -1;
|
|
fba->emu_types[0] = fb->fb_fbtype.fb_type;
|
|
fba->emu_types[1] = -1;
|
|
return (0);
|
|
}
|
|
|
|
/* FBIOGVIDEO: */
|
|
static int cg4gvideo(fb, on)
|
|
struct fbdevice *fb;
|
|
int *on;
|
|
{
|
|
struct cg4_softc *sc = fb->fb_private;
|
|
|
|
*on = !sc->sc_blanked;
|
|
return (0);
|
|
}
|
|
|
|
/* FBIOSVIDEO: */
|
|
static int cg4svideo(fb, on)
|
|
struct fbdevice *fb;
|
|
int *on;
|
|
{
|
|
struct cg4_softc *sc = fb->fb_private;
|
|
int state;
|
|
|
|
state = *on;
|
|
if (sc->sc_cg4type == CG4_TYPE_A)
|
|
cg4a_svideo(sc, state);
|
|
else
|
|
cg4b_svideo(sc, state);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* FBIOGETCMAP:
|
|
* Copy current colormap out to user space.
|
|
*/
|
|
static int cg4getcmap(fb, fbcm)
|
|
struct fbdevice *fb;
|
|
struct fbcmap *fbcm;
|
|
{
|
|
struct cg4_softc *sc = fb->fb_private;
|
|
struct soft_cmap *cm = &sc->sc_cmap;
|
|
int error, start, count;
|
|
|
|
start = fbcm->index;
|
|
count = fbcm->count;
|
|
if ((start < 0) || (start >= CMAP_SIZE) ||
|
|
(count < 0) || (start + count > CMAP_SIZE) )
|
|
return (EINVAL);
|
|
|
|
if ((error = copyout(&cm->r[start], fbcm->red, count)) != 0)
|
|
return (error);
|
|
|
|
if ((error = copyout(&cm->g[start], fbcm->green, count)) != 0)
|
|
return (error);
|
|
|
|
if ((error = copyout(&cm->b[start], fbcm->blue, count)) != 0)
|
|
return (error);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* FBIOPUTCMAP:
|
|
* Copy new colormap from user space and load.
|
|
*/
|
|
static int cg4putcmap(fb, fbcm)
|
|
struct fbdevice *fb;
|
|
struct fbcmap *fbcm;
|
|
{
|
|
struct cg4_softc *sc = fb->fb_private;
|
|
struct soft_cmap *cm = &sc->sc_cmap;
|
|
int error, start, count;
|
|
|
|
start = fbcm->index;
|
|
count = fbcm->count;
|
|
if ((start < 0) || (start >= CMAP_SIZE) ||
|
|
(count < 0) || (start + count > CMAP_SIZE) )
|
|
return (EINVAL);
|
|
|
|
if ((error = copyin(fbcm->red, &cm->r[start], count)) != 0)
|
|
return (error);
|
|
|
|
if ((error = copyin(fbcm->green, &cm->g[start], count)) != 0)
|
|
return (error);
|
|
|
|
if ((error = copyin(fbcm->blue, &cm->b[start], count)) != 0)
|
|
return (error);
|
|
|
|
if (sc->sc_cg4type == CG4_TYPE_A)
|
|
cg4a_ldcmap(sc);
|
|
else
|
|
cg4b_ldcmap(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/****************************************************************
|
|
* Routines for the "Type A" hardware
|
|
****************************************************************/
|
|
|
|
static void
|
|
cg4a_init(sc)
|
|
struct cg4_softc *sc;
|
|
{
|
|
volatile struct amd_regs *ar = sc->sc_va_cmap;
|
|
struct soft_cmap *cm = &sc->sc_cmap;
|
|
int i;
|
|
|
|
/* grab initial (current) color map */
|
|
for(i = 0; i < 256; i++) {
|
|
cm->r[i] = ar->r[i];
|
|
cm->g[i] = ar->g[i];
|
|
cm->b[i] = ar->b[i];
|
|
}
|
|
}
|
|
|
|
static void
|
|
cg4a_ldcmap(sc)
|
|
struct cg4_softc *sc;
|
|
{
|
|
volatile struct amd_regs *ar = sc->sc_va_cmap;
|
|
struct soft_cmap *cm = &sc->sc_cmap;
|
|
int i;
|
|
|
|
/*
|
|
* Now blast them into the chip!
|
|
* XXX Should use retrace interrupt!
|
|
* Just set a "need load" bit and let the
|
|
* retrace interrupt handler do the work.
|
|
*/
|
|
for(i = 0; i < 256; i++) {
|
|
ar->r[i] = cm->r[i];
|
|
ar->g[i] = cm->g[i];
|
|
ar->b[i] = cm->b[i];
|
|
}
|
|
}
|
|
|
|
static void
|
|
cg4a_svideo(sc, on)
|
|
struct cg4_softc *sc;
|
|
int on;
|
|
{
|
|
volatile struct amd_regs *ar = sc->sc_va_cmap;
|
|
int i;
|
|
|
|
if ((on == 0) && (sc->sc_blanked == 0)) {
|
|
/* Turn OFF video (make it blank). */
|
|
sc->sc_blanked = 1;
|
|
/* Load fake "all zero" colormap. */
|
|
for (i = 0; i < 256; i++) {
|
|
ar->r[i] = 0;
|
|
ar->g[i] = 0;
|
|
ar->b[i] = 0;
|
|
}
|
|
}
|
|
|
|
if ((on != 0) && (sc->sc_blanked != 0)) {
|
|
/* Turn video back ON (unblank). */
|
|
sc->sc_blanked = 0;
|
|
/* Restore normal colormap. */
|
|
cg4a_ldcmap(sc);
|
|
}
|
|
}
|
|
|
|
|
|
/****************************************************************
|
|
* Routines for the "Type B" hardware
|
|
****************************************************************/
|
|
|
|
static void
|
|
cg4b_init(sc)
|
|
struct cg4_softc *sc;
|
|
{
|
|
volatile struct bt_regs *bt = sc->sc_va_cmap;
|
|
struct soft_cmap *cm = &sc->sc_cmap;
|
|
union bt_cmap *btcm = sc->sc_btcm;
|
|
int i;
|
|
|
|
/*
|
|
* BT458 chip initialization as described in Brooktree's
|
|
* 1993 Graphics and Imaging Product Databook (DB004-1/93).
|
|
*/
|
|
bt->bt_addr = 0x04; /* select read mask register */
|
|
bt->bt_ctrl = 0xff; /* all planes on */
|
|
bt->bt_addr = 0x05; /* select blink mask register */
|
|
bt->bt_ctrl = 0x00; /* all planes non-blinking */
|
|
bt->bt_addr = 0x06; /* select command register */
|
|
bt->bt_ctrl = 0x43; /* palette enabled, overlay planes enabled */
|
|
bt->bt_addr = 0x07; /* select test register */
|
|
bt->bt_ctrl = 0x00; /* set test mode */
|
|
|
|
/* grab initial (current) color map */
|
|
bt->bt_addr = 0;
|
|
for (i = 0; i < (256 * 3 / 4); i++) {
|
|
btcm->cm_chip[i] = bt->bt_cmap;
|
|
}
|
|
|
|
/* Transpose into S/W form. */
|
|
for (i = 0; i < 256; i++) {
|
|
cm->r[i] = btcm->cm_map[i][0];
|
|
cm->g[i] = btcm->cm_map[i][1];
|
|
cm->b[i] = btcm->cm_map[i][2];
|
|
}
|
|
}
|
|
|
|
static void
|
|
cg4b_ldcmap(sc)
|
|
struct cg4_softc *sc;
|
|
{
|
|
volatile struct bt_regs *bt = sc->sc_va_cmap;
|
|
struct soft_cmap *cm = &sc->sc_cmap;
|
|
union bt_cmap *btcm = sc->sc_btcm;
|
|
int i;
|
|
|
|
/*
|
|
* Now blast them into the chip!
|
|
* XXX Should use retrace interrupt!
|
|
* Just set a "need load" bit and let the
|
|
* retrace interrupt handler do the work.
|
|
*/
|
|
|
|
/* Transpose into H/W form. */
|
|
for (i = 0; i < 256; i++) {
|
|
btcm->cm_map[i][0] = cm->r[i];
|
|
btcm->cm_map[i][1] = cm->g[i];
|
|
btcm->cm_map[i][2] = cm->b[i];
|
|
}
|
|
|
|
bt->bt_addr = 0;
|
|
for (i = 0; i < (256 * 3 / 4); i++) {
|
|
bt->bt_cmap = btcm->cm_chip[i];
|
|
}
|
|
}
|
|
|
|
static void
|
|
cg4b_svideo(sc, on)
|
|
struct cg4_softc *sc;
|
|
int on;
|
|
{
|
|
volatile struct bt_regs *bt = sc->sc_va_cmap;
|
|
int i;
|
|
|
|
if ((on == 0) && (sc->sc_blanked == 0)) {
|
|
/* Turn OFF video (make it blank). */
|
|
sc->sc_blanked = 1;
|
|
/* Load fake "all zero" colormap. */
|
|
bt->bt_addr = 0;
|
|
for (i = 0; i < (256 * 3 / 4); i++)
|
|
bt->bt_cmap = 0;
|
|
}
|
|
|
|
if ((on != 0) && (sc->sc_blanked != 0)) {
|
|
/* Turn video back ON (unblank). */
|
|
sc->sc_blanked = 0;
|
|
/* Restore normal colormap. */
|
|
cg4b_ldcmap(sc);
|
|
}
|
|
}
|
|
|