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[PATCH] x86: AUX_DEVICE_INFO is one byte long, use 'movb'

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Bugzilla #6552 says:

"In arch/i386/boot/setup.S, movw is used instead of movb for PS/2 mouse
information, although it is unsigned char. This does not harm, because
the jmp instruction overwritten by movw is used before executing movw,
and never be used again"

I've no idea if this is a real bug or how it gets fixed, so I'm submitting
it for review instead of letting it die of boredom in bugzilla. Aditionally
to i386, I've changed x86-64, which mirrors the same code.

Credits to Yoshinori K. Okuji, who found the problem and suggested a fix.

Signed-off-by: Diego Calleja <diegocg@gmail.com>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Diego Calleja 2006-09-26 10:52:30 +02:00 committed by Andi Kleen
parent cf4c6a2f27
commit 606bd58de6
2 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/i386/boot/setup.S
View File

@ -494,12 +494,12 @@ no_voyager:
movw %cs, %ax # aka SETUPSEG
subw $DELTA_INITSEG, %ax # aka INITSEG
movw %ax, %ds
movw $0, (0x1ff) # default is no pointing device
movb $0, (0x1ff) # default is no pointing device
int $0x11 # int 0x11: equipment list
testb $0x04, %al # check if mouse installed
jz no_psmouse
movw $0xAA, (0x1ff) # device present
movb $0xAA, (0x1ff) # device present
no_psmouse:
#if defined(CONFIG_X86_SPEEDSTEP_SMI) || defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)

4
arch/x86_64/boot/setup.S
View File

@ -526,12 +526,12 @@ is_disk1:
movw %cs, %ax # aka SETUPSEG
subw $DELTA_INITSEG, %ax # aka INITSEG
movw %ax, %ds
movw $0, (0x1ff) # default is no pointing device
movb $0, (0x1ff) # default is no pointing device
int $0x11 # int 0x11: equipment list
testb $0x04, %al # check if mouse installed
jz no_psmouse
movw $0xAA, (0x1ff) # device present
movb $0xAA, (0x1ff) # device present
no_psmouse:
#include "../../i386/boot/edd.S"