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Some of newer PC-98 may cause "Windows Protection Fault" when booting

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Windows 95 after rebooting FreeBSD without power off.  In PC-98
system, reboot mode is set via I/O port 0x37 in cpu_reset(), and
accessing of this port is the reason of the problem.  To avnoid the
fault, current status of reboot mode should be checked before
accessing the I/O port.
This commit is contained in:
KATO Takenori 1998-05-16 14:44:11 +00:00
parent 0d303cbabf
commit 8e929d6553
2 changed files with 10 additions and 6 deletions
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8
sys/amd64/amd64/vm_machdep.c
View File

@ -38,7 +38,7 @@
*
* from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
* Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
* $Id: vm_machdep.c,v 1.104 1998/03/17 09:10:05 kato Exp $
* $Id: vm_machdep.c,v 1.105 1998/03/23 19:52:42 jlemon Exp $
*/
#include "npx.h"
@ -847,8 +847,10 @@ cpu_reset()
* Attempt to do a CPU reset via CPU reset port.
*/
disable_intr();
outb(0x37, 0x0f); /* SHUT0 = 0. */
outb(0x37, 0x0b); /* SHUT1 = 0. */
if ((inb(0x35) & 0xa0) != 0xa0) {
outb(0x37, 0x0f); /* SHUT0 = 0. */
outb(0x37, 0x0b); /* SHUT1 = 0. */
}
outb(0xf0, 0x00); /* Reset. */
#else
/*

8
sys/i386/i386/vm_machdep.c
View File

@ -38,7 +38,7 @@
*
* from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
* Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
* $Id: vm_machdep.c,v 1.104 1998/03/17 09:10:05 kato Exp $
* $Id: vm_machdep.c,v 1.105 1998/03/23 19:52:42 jlemon Exp $
*/
#include "npx.h"
@ -847,8 +847,10 @@ cpu_reset()
* Attempt to do a CPU reset via CPU reset port.
*/
disable_intr();
outb(0x37, 0x0f); /* SHUT0 = 0. */
outb(0x37, 0x0b); /* SHUT1 = 0. */
if ((inb(0x35) & 0xa0) != 0xa0) {
outb(0x37, 0x0f); /* SHUT0 = 0. */
outb(0x37, 0x0b); /* SHUT1 = 0. */
}
outb(0xf0, 0x00); /* Reset. */
#else
/*