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Add a workaround for AST BIOS.

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okuji 2001-12-19 11:37:17 +00:00
parent f9e7ef1b41
commit 728d26ca30
3 changed files with 15 additions and 1 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2001-12-19 Yoshinori K. Okuji <okuji@gnu.org>
From Michael Sullivan <mike@trdlnk.com>:
* stage1/stage1.S (real_start): Added a workaround for AST BIOS,
because it clobbers %dl with INT 13, AH=41H.
2001-12-19 Yoshinori K. Okuji <okuji@gnu.org>
* stage2/fsys_fat.c (fat_read): Fix the contradictory comment.

1
THANKS
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@ -60,6 +60,7 @@ Matt Yourst <yourst@mit.edu>
Matthias Granberry <matthias@slurpee.org>
Matthias Kretschmer <m.kretschmer@bsdger.org>
Michael Hohmuth <hohmuth@innocent.com>
Michael Sullivan <mike@trdlnk.com>
Mike Meyer <mwm@mired.org>
Miles Bader <miles@gnu.org>
Neal H Walfield <neal@walfield.org>

9
stage1/stage1.S
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@ -1,7 +1,7 @@
/* -*-Asm-*- */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000 Free Software Foundation, Inc.
* Copyright (C) 1999,2000,2001 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -148,6 +148,13 @@ real_start:
movw $0x55aa, %bx
int $0x13
/*
* %dl may have been clobbered by INT 13, AH=41H.
* This happens, for example, with AST BIOS 1.04.
*/
popw %dx
pushw %dx
/* use CHS if fails */
jc chs_mode
cmpw $0xaa55, %bx