From: Alexander van Heukelum <heukelum@mailshack.com>
To: Andi Kleen <ak@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>,
lkml <linux-kernel@vger.kernel.org>
Subject: [PATCH] Make bootsector stub 16-bit-only (i386)
Date: Sat, 5 May 2007 12:44:52 +0200 [thread overview]
Message-ID: <20070505104452.GA30944@mailshack.com> (raw)
Hi!
The x86 bzImage contains a stub to inform people that it is not possible
any more to run a Linux kernel by catting it to a floppy and then
booting from it. This was meant to be all 16-bit code. The first
instruction, however, ended up as being coded as a 16:32-bit far jump. I
assume the intention was a 16:16-bit far jump.
This patch changes only i386.
Greetings,
Alexander
Signed-off-by: Alexander van Heukelum <heukelum@mailshack.com>
---
diff --git a/arch/i386/boot/bootsect.S b/arch/i386/boot/bootsect.S
index 011b7a4..ae9df0d 100644
--- a/arch/i386/boot/bootsect.S
+++ b/arch/i386/boot/bootsect.S
@@ -44,7 +44,7 @@ #endif
_start:
# Normalize the start address
- jmpl $BOOTSEG, $start2
+ jmpw $BOOTSEG, $start2
start2:
movw %cs, %ax
next reply other threads:[~2007-05-05 17:00 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-05 10:44 Alexander van Heukelum [this message]
2007-05-05 18:07 ` [PATCH] Make bootsector stub 16-bit-only (i386) H. Peter Anvin
2007-05-08 10:28 ` Andrew Morton
2007-05-08 11:25 ` H. Peter Anvin
2007-05-08 12:27 ` Andi Kleen
2007-05-08 17:13 ` H. Peter Anvin
2007-05-08 18:12 ` Andrew Morton
2007-05-08 18:27 ` H. Peter Anvin
2007-05-08 18:32 ` Alexander van Heukelum
2007-05-08 18:45 ` H. Peter Anvin
2007-05-08 19:19 ` Alexander van Heukelum
2007-05-08 22:27 ` H. Peter Anvin
2007-05-08 20:00 ` Andrew Morton
2007-05-09 0:04 ` Antonino A. Daplas
2007-05-09 8:54 ` Alexander van Heukelum
2007-05-09 13:45 ` Antonino A. Daplas
2007-05-09 16:51 ` H. Peter Anvin
2007-05-09 18:18 ` Alexander van Heukelum
2007-05-09 18:27 ` H. Peter Anvin
2007-05-09 14:30 ` Lennart Sorensen
2007-05-09 14:51 ` Antonino A. Daplas
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