Date: Sun, 08 Jun 1997 22:13:34 +0900 From: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp> To: Wilko Bulte <wilko@yedi.iaf.nl> Cc: FreeBSD-hackers@freebsd.org (FreeBSD hackers list), yokota@zodiac.mech.utsunomiya-u.ac.jp Subject: Re: Lockup during kernel device probe on 2.2.1R Message-ID: <199706081313.WAA01984@zodiac.mech.utsunomiya-u.ac.jp> In-Reply-To: Your message of "Sat, 07 Jun 1997 20:49:19 %2B0200." <199706071849.UAA00951@yedi.iaf.nl> References: <199706071849.UAA00951@yedi.iaf.nl>
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>OS: FreeBSD 2.2.1R straight of the CD
>Machines: 4x 486DX/33, all the same EISA motherboard (Philips P9175 to be
> exact)
> memory: 12 or 16 Mb
> disk: 3x AHA1740 with different brands of rootdisks
> 1x WD1007 with ESDI Micropolis
> console: 3x VGA, 1x EGA
>
>
>Problem: Of the 4 machines, 3 lockup after "boot -v"-ing the 2.2.1R
> bootflop. The last message printed is from syscons:
> bla bla port is 0045 (I of course forgot to take the
> paper with the exact message :( ) Then nothing appears on
> the (VGA) console anymore.
>
> Of the 3 failing machines, 2 are currently running 2.1.6R like
> a charm. Disabling all of the devices that are not essential
> makes no difference whatsoever.
>
> Interestingly enough the 4th machine runs and boots 2.2.1R without
> any problem. Has Orchid Prodesigner VGA BTW.
So, the video cards which failed to boot 2.2.1R are 2 VGAs and 1 EGA,
right? Would you tell us the brands and models of these cards?
What I can think of is...
Try booting the 2.2.2R boot.flp on the failed systems and see how
it goes. If they can boot the floppy, you may either:
a) install 2.2.2R rather than 2.2.1R, or
b) put the Orchid card in the failed systems and install 2.2.1R.
Then apply the following patch to /sys/i386/isa/syscons.c so that
the syscons driver is brought to the level of 2.2.2R, and put
back the original video card.
Kazu
Index: syscons.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/isa/syscons.c,v
retrieving revision 1.182.2.15
retrieving revision 1.182.2.18
diff -u -r1.182.2.15 -r1.182.2.18
--- syscons.c 1997/03/09 06:32:28 1.182.2.15
+++ syscons.c 1997/05/11 06:09:02 1.182.2.18
@@ -25,7 +25,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
- * $Id: syscons.c,v 1.182.2.15 1997/03/09 06:32:28 yokota Exp $
+ * $Id: syscons.c,v 1.182.2.18 1997/05/11 06:09:02 yokota Exp $
*/
#include "sc.h"
@@ -79,8 +79,9 @@
#define COLD 0
#define WARM 1
-/* this may break on older VGA's but is useful on real 32 bit systems */
-#define bcopyw bcopy
+/* XXX use sc_bcopy where video memory is concerned */
+#define sc_bcopy generic_bcopy
+extern void generic_bcopy(const void *, void *, size_t);
static default_attr user_default = {
(FG_LIGHTGREY | BG_BLACK) << 8,
@@ -127,6 +128,7 @@
char font_14[256*14];
char font_16[256*16];
char palette[256*3];
+static char vgaregs[64];
static char *cut_buffer;
static u_short mouse_and_mask[16] = {
0xc000, 0xe000, 0xf000, 0xf800,
@@ -201,6 +203,9 @@
static void set_keyboard(int command, int data);
static void update_leds(int which);
static void set_vgaregs(char *modetable);
+static void read_vgaregs(char *buf);
+static int comp_vgaregs(u_char *buf1, u_char *buf2);
+static void dump_vgaregs(u_char *buf);
static void set_font_mode(void);
static void set_normal_mode(void);
static void set_destructive_cursor(scr_stat *scp);
@@ -332,14 +337,10 @@
c |= KBD_OVERRIDE_KBD_LOCK;
#endif
- /*
- * enable the keyboard port, but disable the keyboard intr.
- * the aux port (mouse port) is disabled too.
- */
+ /* enable the keyboard port, but disable the keyboard intr. */
if (!set_controller_command_byte(sc_kbdc,
- KBD_KBD_CONTROL_BITS | KBD_AUX_CONTROL_BITS,
- KBD_ENABLE_KBD_PORT | KBD_DISABLE_KBD_INT
- | KBD_DISABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
+ KBD_KBD_CONTROL_BITS,
+ KBD_ENABLE_KBD_PORT | KBD_DISABLE_KBD_INT)) {
/* CONTROLLER ERROR
* there is very little we can do...
*/
@@ -411,8 +412,8 @@
}
/* enable the keyboard port and intr. */
if (!set_controller_command_byte(sc_kbdc,
- KBD_KBD_CONTROL_BITS | KBD_AUX_CONTROL_BITS | KBD_OVERRIDE_KBD_LOCK,
- (c & (KBD_AUX_CONTROL_BITS | KBD_OVERRIDE_KBD_LOCK))
+ KBD_KBD_CONTROL_BITS | KBD_TRANSLATION | KBD_OVERRIDE_KBD_LOCK,
+ (c & (KBD_TRANSLATION | KBD_OVERRIDE_KBD_LOCK))
| KBD_ENABLE_KBD_PORT | KBD_ENABLE_KBD_INT)) {
/* CONTROLLER ERROR
* This is serious; we are left with the disabled keyboard intr.
@@ -468,7 +469,7 @@
M_DEVBUF, M_NOWAIT);
/* copy temporary buffer to final buffer */
- bcopyw(sc_buffer, scp->scr_buf, scp->xsize * scp->ysize * sizeof(u_short));
+ bcopy(sc_buffer, scp->scr_buf, scp->xsize * scp->ysize * sizeof(u_short));
scp->cursor_pos = scp->cursor_oldpos =
scp->scr_buf + scp->xpos + scp->ypos * scp->xsize;
@@ -494,6 +495,19 @@
update_leds(scp->status);
+ if (bootverbose) {
+ printf("sc%d: BIOS video mode:%d\n",
+ dev->id_unit, *(u_char *)pa_to_va(0x449));
+ printf("sc%d: VGA registers upon power-up\n", dev->id_unit);
+ dump_vgaregs(vgaregs);
+ printf("sc%d: video mode:%d\n", dev->id_unit, scp->mode);
+ if (video_mode_ptr != NULL) {
+ printf("sc%d: VGA registers for mode:%d\n",
+ dev->id_unit, scp->mode);
+ dump_vgaregs(video_mode_ptr + (64*scp->mode));
+ }
+ }
+
printf("sc%d: ", dev->id_unit);
if (crtc_vga)
if (crtc_addr == MONO_BASE)
@@ -1472,7 +1486,7 @@
s = splclock();
if (scp == cur_console && !(scp->status & UNKNOWN_MODE)) {
if (/* timer not running && */ (scp->start <= scp->end)) {
- bcopyw(scp->scr_buf + scp->start, Crtat + scp->start,
+ sc_bcopy(scp->scr_buf + scp->start, Crtat + scp->start,
(1 + scp->end - scp->start) * sizeof(u_short));
scp->start = scp->xsize * scp->ysize;
scp->end = 0;
@@ -1564,7 +1578,7 @@
if (!scrn_blanked) {
/* update screen image */
if (scp->start <= scp->end) {
- bcopyw(scp->scr_buf + scp->start, Crtat + scp->start,
+ sc_bcopy(scp->scr_buf + scp->start, Crtat + scp->start,
(1 + scp->end - scp->start) * sizeof(u_short));
}
@@ -1753,7 +1767,7 @@
if (scp->ypos > 0)
move_crsr(scp, scp->xpos, scp->ypos - 1);
else {
- bcopyw(scp->scr_buf, scp->scr_buf + scp->xsize,
+ bcopy(scp->scr_buf, scp->scr_buf + scp->xsize,
(scp->ysize - 1) * scp->xsize * sizeof(u_short));
fillw(scp->term.cur_color | scr_map[0x20],
scp->scr_buf, scp->xsize);
@@ -1906,7 +1920,7 @@
src = scp->scr_buf + scp->ypos * scp->xsize;
dst = src + n * scp->xsize;
count = scp->ysize - (scp->ypos + n);
- bcopyw(src, dst, count * scp->xsize * sizeof(u_short));
+ bcopy(src, dst, count * scp->xsize * sizeof(u_short));
fillw(scp->term.cur_color | scr_map[0x20], src,
n * scp->xsize);
mark_for_update(scp, scp->ypos * scp->xsize);
@@ -1920,7 +1934,7 @@
dst = scp->scr_buf + scp->ypos * scp->xsize;
src = dst + n * scp->xsize;
count = scp->ysize - (scp->ypos + n);
- bcopyw(src, dst, count * scp->xsize * sizeof(u_short));
+ bcopy(src, dst, count * scp->xsize * sizeof(u_short));
src = dst + count * scp->xsize;
fillw(scp->term.cur_color | scr_map[0x20], src,
n * scp->xsize);
@@ -1935,7 +1949,7 @@
dst = scp->cursor_pos;
src = dst + n;
count = scp->xsize - (scp->xpos + n);
- bcopyw(src, dst, count * sizeof(u_short));
+ bcopy(src, dst, count * sizeof(u_short));
src = dst + count;
fillw(scp->term.cur_color | scr_map[0x20], src, n);
mark_for_update(scp, scp->cursor_pos - scp->scr_buf);
@@ -1949,7 +1963,7 @@
src = scp->cursor_pos;
dst = src + n;
count = scp->xsize - (scp->xpos + n);
- bcopyw(src, dst, count * sizeof(u_short));
+ bcopy(src, dst, count * sizeof(u_short));
fillw(scp->term.cur_color | scr_map[0x20], src, n);
mark_for_update(scp, scp->cursor_pos - scp->scr_buf);
mark_for_update(scp, scp->cursor_pos - scp->scr_buf + n + count);
@@ -1959,7 +1973,7 @@
n = scp->term.param[0]; if (n < 1) n = 1;
if (n > scp->ysize)
n = scp->ysize;
- bcopyw(scp->scr_buf + (scp->xsize * n),
+ bcopy(scp->scr_buf + (scp->xsize * n),
scp->scr_buf,
scp->xsize * (scp->ysize - n) * sizeof(u_short));
fillw(scp->term.cur_color | scr_map[0x20],
@@ -1972,7 +1986,7 @@
n = scp->term.param[0]; if (n < 1) n = 1;
if (n > scp->ysize)
n = scp->ysize;
- bcopyw(scp->scr_buf,
+ bcopy(scp->scr_buf,
scp->scr_buf + (scp->xsize * n),
scp->xsize * (scp->ysize - n) *
sizeof(u_short));
@@ -2342,14 +2356,14 @@
if (scp->cursor_pos >= scp->scr_buf + scp->ysize * scp->xsize) {
remove_cutmarking(scp);
if (scp->history) {
- bcopyw(scp->scr_buf, scp->history_head,
+ bcopy(scp->scr_buf, scp->history_head,
scp->xsize * sizeof(u_short));
scp->history_head += scp->xsize;
if (scp->history_head + scp->xsize >
scp->history + scp->history_size)
scp->history_head = scp->history;
}
- bcopyw(scp->scr_buf + scp->xsize, scp->scr_buf,
+ bcopy(scp->scr_buf + scp->xsize, scp->scr_buf,
scp->xsize * (scp->ysize - 1) * sizeof(u_short));
fillw(scp->term.cur_color | scr_map[0x20],
scp->scr_buf + scp->xsize * (scp->ysize - 1),
@@ -2431,6 +2445,7 @@
u_long segoff;
crtc_vga = TRUE;
+ read_vgaregs(vgaregs);
/* Get the BIOS video mode pointer */
segoff = *(u_long *)pa_to_va(0x4a8);
@@ -2447,8 +2462,14 @@
init_scp(console[0]);
cur_console = console[0];
+ /* discard the video mode table if we are not familiar with it... */
+ if (video_mode_ptr) {
+ if (comp_vgaregs(vgaregs, video_mode_ptr + 64*console[0]->mode))
+ video_mode_ptr = NULL;
+ }
+
/* copy screen to temporary buffer */
- bcopyw(Crtat, sc_buffer,
+ sc_bcopy(Crtat, sc_buffer,
console[0]->xsize * console[0]->ysize * sizeof(u_short));
console[0]->scr_buf = console[0]->mouse_pos = sc_buffer;
@@ -2577,7 +2598,7 @@
int i;
for (i=0; i<scp->ysize; i++)
- bcopyw(scp->history + (((scp->history_pos - scp->history) +
+ bcopy(scp->history + (((scp->history_pos - scp->history) +
scp->history_size-((i+1)*scp->xsize))%scp->history_size),
scp->scr_buf + (scp->xsize * (scp->ysize-1 - i)),
scp->xsize * sizeof(u_short));
@@ -2759,7 +2780,7 @@
/* copy screen into top of history buffer */
for (i=0; i<cur_console->ysize; i++) {
- bcopyw(cur_console->scr_buf + (cur_console->xsize * i),
+ bcopy(cur_console->scr_buf + (cur_console->xsize * i),
cur_console->history_head,
cur_console->xsize * sizeof(u_short));
cur_console->history_head += cur_console->xsize;
@@ -2941,7 +2962,7 @@
u_short *ptr = cur_console->history_save;
for (i=0; i<cur_console->ysize; i++) {
- bcopyw(ptr,
+ bcopy(ptr,
cur_console->scr_buf +
(cur_console->xsize*i),
cur_console->xsize * sizeof(u_short));
@@ -3110,11 +3131,12 @@
/* disable the keyboard and mouse interrupt */
s = spltty();
+#if 0
c = get_controller_command_byte(sc_kbdc);
if ((c == -1)
|| !set_controller_command_byte(sc_kbdc,
kbdc_get_device_mask(sc_kbdc),
- KBD_ENABLE_KBD_PORT | KBD_DISABLE_KBD_INT
+ KBD_DISABLE_KBD_PORT | KBD_DISABLE_KBD_INT
| KBD_DISABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
/* CONTROLLER ERROR */
kbdc_lock(sc_kbdc, FALSE);
@@ -3129,15 +3151,21 @@
* by the lock flag set via `kbdc_lock()'
*/
splx(s);
+#endif
- send_kbd_command_and_data(sc_kbdc, command, data);
+ if (send_kbd_command_and_data(sc_kbdc, command, data) != KBD_ACK)
+ send_kbd_command(sc_kbdc, KBDC_ENABLE_KBD);
+#if 0
/* restore the interrupts */
if (!set_controller_command_byte(sc_kbdc,
kbdc_get_device_mask(sc_kbdc),
c & (KBD_KBD_CONTROL_BITS | KBD_AUX_CONTROL_BITS))) {
/* CONTROLLER ERROR */
}
+#else
+ splx(s);
+#endif
kbdc_lock(sc_kbdc, FALSE);
}
@@ -3169,22 +3197,22 @@
/* setup video hardware for the given mode */
switch (scp->mode) {
case M_VGA_M80x60:
- bcopyw(video_mode_ptr+(64*M_VGA_M80x25), &special_modetable, 64);
+ bcopy(video_mode_ptr+(64*M_VGA_M80x25), &special_modetable, 64);
goto special_80x60;
case M_VGA_C80x60:
- bcopyw(video_mode_ptr+(64*M_VGA_C80x25), &special_modetable, 64);
+ bcopy(video_mode_ptr+(64*M_VGA_C80x25), &special_modetable, 64);
special_80x60:
special_modetable[2] = 0x08;
special_modetable[19] = 0x47;
goto special_480l;
case M_VGA_M80x30:
- bcopyw(video_mode_ptr+(64*M_VGA_M80x25), &special_modetable, 64);
+ bcopy(video_mode_ptr+(64*M_VGA_M80x25), &special_modetable, 64);
goto special_80x30;
case M_VGA_C80x30:
- bcopyw(video_mode_ptr+(64*M_VGA_C80x25), &special_modetable, 64);
+ bcopy(video_mode_ptr+(64*M_VGA_C80x25), &special_modetable, 64);
special_80x30:
special_modetable[19] = 0x4f;
special_480l:
@@ -3199,21 +3227,21 @@
goto setup_mode;
case M_ENH_B80x43:
- bcopyw(video_mode_ptr+(64*M_ENH_B80x25), &special_modetable, 64);
+ bcopy(video_mode_ptr+(64*M_ENH_B80x25), &special_modetable, 64);
goto special_80x43;
case M_ENH_C80x43:
- bcopyw(video_mode_ptr+(64*M_ENH_C80x25), &special_modetable, 64);
+ bcopy(video_mode_ptr+(64*M_ENH_C80x25), &special_modetable, 64);
special_80x43:
special_modetable[28] = 87;
goto special_80x50;
case M_VGA_M80x50:
- bcopyw(video_mode_ptr+(64*M_VGA_M80x25), &special_modetable, 64);
+ bcopy(video_mode_ptr+(64*M_VGA_M80x25), &special_modetable, 64);
goto special_80x50;
case M_VGA_C80x50:
- bcopyw(video_mode_ptr+(64*M_VGA_C80x25), &special_modetable, 64);
+ bcopy(video_mode_ptr+(64*M_VGA_C80x25), &special_modetable, 64);
special_80x50:
special_modetable[2] = 8;
special_modetable[19] = 7;
@@ -3316,6 +3344,86 @@
}
static void
+read_vgaregs(char *buf)
+{
+ int i, j;
+ int s;
+
+ bzero(buf, 64);
+
+ s = splhigh();
+
+ outb(TSIDX, 0x00); outb(TSREG, 0x01); /* stop sequencer */
+ outb(TSIDX, 0x07); outb(TSREG, 0x00); /* unlock registers */
+ for (i=0, j=5; i<4; i++) {
+ outb(TSIDX, i+1);
+ buf[j++] = inb(TSREG);
+ }
+ buf[9] = inb(MISC + 10); /* dot-clock */
+ outb(TSIDX, 0x00); outb(TSREG, 0x03); /* start sequencer */
+
+ for (i=0, j=10; i<25; i++) { /* crtc */
+ outb(crtc_addr, i);
+ buf[j++] = inb(crtc_addr+1);
+ }
+ for (i=0, j=35; i<20; i++) { /* attribute ctrl */
+ inb(crtc_addr+6); /* reset flip-flop */
+ outb(ATC, i);
+ buf[j++] = inb(ATC + 1);
+ }
+ for (i=0, j=55; i<9; i++) { /* graph data ctrl */
+ outb(GDCIDX, i);
+ buf[j++] = inb(GDCREG);
+ }
+ inb(crtc_addr+6); /* reset flip-flop */
+ outb(ATC, 0x20); /* enable palette */
+
+ buf[0] = *(char *)pa_to_va(0x44a); /* COLS */
+ buf[1] = *(char *)pa_to_va(0x484); /* ROWS */
+ buf[2] = *(char *)pa_to_va(0x485); /* POINTS */
+ buf[3] = *(char *)pa_to_va(0x44c);
+ buf[4] = *(char *)pa_to_va(0x44d);
+
+ splx(s);
+}
+
+static int
+comp_vgaregs(u_char *buf1, u_char *buf2)
+{
+ int i;
+
+ for(i = 0; i < 20; ++i) {
+ if (*buf1++ != *buf2++)
+ return 1;
+ }
+ buf1 += 2; /* skip the cursor shape */
+ buf2 += 2;
+ for(i = 22; i < 24; ++i) {
+ if (*buf1++ != *buf2++)
+ return 1;
+ }
+ buf1 += 2; /* skip the cursor position */
+ buf2 += 2;
+ for(i = 26; i < 64; ++i) {
+ if (*buf1++ != *buf2++)
+ return 1;
+ }
+ return 0;
+}
+
+static void
+dump_vgaregs(u_char *buf)
+{
+ int i;
+
+ for(i = 0; i < 64;) {
+ printf("%02x ", buf[i]);
+ if ((++i % 16) == 0)
+ printf("\n");
+ }
+}
+
+static void
set_font_mode()
{
int s = splhigh();
@@ -3387,6 +3495,9 @@
modetable = video_mode_ptr + (64*M_VGA_C80x25);
}
+ if (video_mode_ptr == NULL)
+ modetable = vgaregs;
+
/* setup vga for normal operation mode again */
inb(crtc_addr+6); /* reset flip-flop */
outb(ATC, 0x10); outb(ATC, modetable[0x10+35]);
@@ -3481,19 +3592,19 @@
if (scp->status & MOUSE_VISIBLE) {
if ((scp->cursor_saveunder & 0xff) == 0xd0)
- bcopyw(&scp->mouse_cursor[0], cursor, scp->font_size);
+ bcopy(&scp->mouse_cursor[0], cursor, scp->font_size);
else if ((scp->cursor_saveunder & 0xff) == 0xd1)
- bcopyw(&scp->mouse_cursor[32], cursor, scp->font_size);
+ bcopy(&scp->mouse_cursor[32], cursor, scp->font_size);
else if ((scp->cursor_saveunder & 0xff) == 0xd2)
- bcopyw(&scp->mouse_cursor[64], cursor, scp->font_size);
+ bcopy(&scp->mouse_cursor[64], cursor, scp->font_size);
else if ((scp->cursor_saveunder & 0xff) == 0xd3)
- bcopyw(&scp->mouse_cursor[96], cursor, scp->font_size);
+ bcopy(&scp->mouse_cursor[96], cursor, scp->font_size);
else
- bcopyw(font_buffer+((scp->cursor_saveunder & 0xff)*scp->font_size),
+ bcopy(font_buffer+((scp->cursor_saveunder & 0xff)*scp->font_size),
cursor, scp->font_size);
}
else
- bcopyw(font_buffer + ((scp->cursor_saveunder & 0xff) * scp->font_size),
+ bcopy(font_buffer + ((scp->cursor_saveunder & 0xff) * scp->font_size),
cursor, scp->font_size);
for (i=0; i<32; i++)
if ((i >= scp->cursor_start && i <= scp->cursor_end) ||
@@ -3503,7 +3614,7 @@
while (!(inb(crtc_addr+6) & 0x08)) /* wait for vertical retrace */ ;
#endif
set_font_mode();
- bcopy(cursor, (char *)pa_to_va(address) + DEAD_CHAR * 32, 32);
+ sc_bcopy(cursor, (char *)pa_to_va(address) + DEAD_CHAR * 32, 32);
set_normal_mode();
}
@@ -3630,13 +3741,13 @@
yoffset = scp->mouse_ypos % font_size;
/* prepare mousepointer char's bitmaps */
- bcopyw(font_buffer + ((*(scp->mouse_pos) & 0xff) * font_size),
+ bcopy(font_buffer + ((*(scp->mouse_pos) & 0xff) * font_size),
&scp->mouse_cursor[0], font_size);
- bcopyw(font_buffer + ((*(scp->mouse_pos+1) & 0xff) * font_size),
+ bcopy(font_buffer + ((*(scp->mouse_pos+1) & 0xff) * font_size),
&scp->mouse_cursor[32], font_size);
- bcopyw(font_buffer + ((*(scp->mouse_pos+scp->xsize) & 0xff) * font_size),
+ bcopy(font_buffer + ((*(scp->mouse_pos+scp->xsize) & 0xff) * font_size),
&scp->mouse_cursor[64], font_size);
- bcopyw(font_buffer + ((*(scp->mouse_pos+scp->xsize+1) & 0xff) * font_size),
+ bcopy(font_buffer + ((*(scp->mouse_pos+scp->xsize+1) & 0xff) * font_size),
&scp->mouse_cursor[96], font_size);
for (i=0; i<font_size; i++) {
buffer[i] = scp->mouse_cursor[i]<<8 | scp->mouse_cursor[i+32];
@@ -3663,7 +3774,7 @@
while (!(inb(crtc_addr+6) & 0x08)) /* idle */ ;
#endif
set_font_mode();
- bcopy(scp->mouse_cursor, (char *)pa_to_va(address) + 0xd0 * 32, 128);
+ sc_bcopy(scp->mouse_cursor, (char *)pa_to_va(address) + 0xd0 * 32, 128);
set_normal_mode();
*(crt_pos) = (*(scp->mouse_pos)&0xff00)|0xd0;
*(crt_pos+scp->xsize) = (*(scp->mouse_pos+scp->xsize)&0xff00)|0xd2;
@@ -3798,8 +3909,12 @@
{
static int toggle = 0;
static u_char save_mode;
- int s = splhigh();
+ int s;
+
+ if (video_mode_ptr == NULL)
+ return;
+ s = splhigh();
if (toggle) {
scp->mode = save_mode;
scp->status &= ~UNKNOWN_MODE;
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