[x86 setup] Save/restore DS around invocations of INT 10h
authorH. Peter Anvin <hpa@zytor.com>
Mon, 16 Jul 2007 18:58:24 +0000 (11:58 -0700)
committerH. Peter Anvin <hpa@zytor.com>
Wed, 18 Jul 2007 18:36:17 +0000 (11:36 -0700)
commit8c027ae2dcfa7b9130941a2a743c735c1fee04ee
treecf0f803ee6f3dcaa323f171b58da0bf0b70c9899
parent7ad37df02c529525c4ad19035359af89d2d2a5bd
[x86 setup] Save/restore DS around invocations of INT 10h

There exists at least one card, Trident TVGA8900CL (BIOS dated 1992/9/8)
which clobbers DS when "scrolling in an SVGA text mode of more than
800x600 pixels."  Although we are extremely unlikely to run into that
situation, it is cheap insurance to save and restore DS, and it only adds
a grand total of 50 bytes to the total output.

Pointed out by Etienne Lorrain.

Cc: Etienne Lorrain <etienne_lorrain@yahoo.fr>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
arch/i386/boot/tty.c
arch/i386/boot/video.h