From: Andi Kleen <ak@muc.de>
To: torvalds@transmeta.com
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] Use correct x86 reboot vector
Date: Sat, 10 May 2003 04:56:34 +0200 [thread overview]
Message-ID: <20030510025634.GA31713@averell> (raw)
Extensive discussion by various experts on the discuss@x86-64.org
mailing list concluded that the correct vector to restart an 286+
CPU is f000:fff0, not ffff:0000. Both seem to work on current systems,
but the first is correct.
See the "DPMI on AMD64" and "Warm reboot for x86-64 linux" threads
on http://www.x86-64.org/mailing_lists/list?listname=discuss&listnum=0
for more details.
This patch fixes the 2.5.69 i386 reboot code to use this too.
--- linux-2.5.69/arch/i386/kernel/reboot.c-o 2003-03-28 18:32:18.000000000 +0100
+++ linux-2.5.69/arch/i386/kernel/reboot.c 2003-05-10 04:51:35.000000000 +0200
@@ -123,7 +123,7 @@
};
static unsigned char jump_to_bios [] =
{
- 0xea, 0x00, 0x00, 0xff, 0xff /* ljmp $0xffff,$0x0000 */
+ 0xea, 0xf0, 0xff, 0x00, 0xf0 /* ljmp $0xf000:0xfff0 */
};
/*
next reply other threads:[~2003-05-10 2:44 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-10 2:56 Andi Kleen [this message]
2003-05-10 3:35 ` [PATCH] Use correct x86 reboot vector CaT
2003-05-10 3:58 ` H. Peter Anvin
2003-05-10 14:49 ` Alan Cox
2003-05-10 16:17 ` Jamie Lokier
2003-05-10 18:47 ` Jos Hulzink
2003-05-11 18:01 ` Eric W. Biederman
2003-05-11 17:24 ` Alan Cox
2003-05-11 19:04 ` Eric W. Biederman
2003-05-12 5:48 ` [PATCH] always shutdown on the bootstrap processor Eric W. Biederman
2003-05-10 16:15 ` [PATCH] Use correct x86 reboot vector Jamie Lokier
2003-05-10 17:09 ` Randy.Dunlap
2003-05-10 19:41 ` Jos Hulzink
2003-05-10 18:10 ` Jamie Lokier
2003-05-10 20:55 ` Jos Hulzink
2003-05-11 3:50 ` Linus Torvalds
2003-05-11 9:37 ` Jos Hulzink
2003-05-11 14:01 ` Jamie Lokier
2003-05-11 17:38 ` Davide Libenzi
2003-05-11 17:56 ` Eric W. Biederman
2003-05-11 18:23 ` Davide Libenzi
2003-05-11 19:12 ` Eric W. Biederman
2003-05-12 15:36 ` Maciej W. Rozycki
2003-05-13 6:35 ` H. Peter Anvin
2003-05-11 18:38 ` Linus Torvalds
2003-05-11 19:00 ` Matt Mackall
2003-05-11 19:16 ` Eric W. Biederman
2003-05-12 1:07 ` H. Peter Anvin
2003-05-11 19:10 ` Eric W. Biederman
2003-05-11 18:43 ` Christer Weinigel
2003-05-11 20:22 ` wingel
2003-05-11 20:26 ` Davide Libenzi
2003-05-11 17:54 ` Eric W. Biederman
-- strict thread matches above, loose matches on Subject: below --
2003-05-13 12:49 Chuck Ebbert
2003-05-13 18:45 ` H. Peter Anvin
2003-05-13 19:04 ` Richard B. Johnson
2003-05-13 19:27 ` H. Peter Anvin
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