Date: Wed, 07 Oct 1998 15:54:16 +0200 From: Stefan Eggers <seggers@semyam.dinoco.de> To: Mike Smith <mike@smith.net.au> Cc: freebsd-current@FreeBSD.ORG, seggers@semyam.dinoco.de Subject: Re: Boot loader's autoload bug fix (was: Re: Two /boot/loader anomalies ) Message-ID: <199810071354.PAA00618@semyam.dinoco.de> In-Reply-To: Your message of "Tue, 06 Oct 1998 18:32:46 PDT." <199810070132.SAA02472@dingo.cdrom.com>
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> Bleagh. Maybe I should clear the keyboard buffer first?
Nothing of this kind necessary at all! I found the problem with this
and have it working now. A mere oversight in the VM86 usage.
It was just the mistake of not setting V86_FLAGS in the control entry
of the VM86 interrupt and thus it didn't pass flags back and what we
don't get we hardly can check with a reliable result. I didn't notice
this when testing because I never bothered with the VM86 mechanism in
BTX (and even in general) before and your suggested fix didn't include
it.
This is *the* fix I hope:
Index: i386/libi386/vidconsole.c
===================================================================
RCS file: /usr2/FreeBSD/CVSROOT/src/sys/boot/i386/libi386/vidconsole.c,v
retrieving revision 1.3
diff -u -r1.3 vidconsole.c
--- vidconsole.c 1998/10/02 16:32:45 1.3
+++ vidconsole.c 1998/10/07 13:49:07
@@ -32,6 +32,7 @@
#include <stand.h>
#include <bootstrap.h>
#include <btxv86.h>
+#include <machine/psl.h>
#include "libi386.h"
#if KEYBOARD_PROBE
@@ -106,11 +107,11 @@
static int
vidc_ischar(void)
{
- v86.ctl = 0;
+ v86.ctl = V86_FLAGS;
v86.addr = 0x16;
v86.eax = 0x100;
v86int();
- return(v86.eax);
+ return((v86.efl & PSL_Z) == 0);
}
#if KEYBOARD_PROBE
Stefan.
--
Stefan Eggers Lu4 yao2 zhi1 ma3 li4,
Max-Slevogt-Str. 1 ri4 jiu3 jian4 ren2 xin1.
51109 Koeln
Federal Republic of Germany
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