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x86, setup: "glove box" BIOS interrupts in the video code

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Impact: BIOS proofing

"Glove box" off BIOS interrupts in the video code.

LKML-Reference: <49DE7F79.4030106@zytor.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
H. Peter Anvin
2009-04-01 18:20:11 -07:00
committed by H. Peter Anvin
parent 0a706db320
commit cf06de7b9c
5 changed files with 151 additions and 164 deletions
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14
arch/x86/boot/video.h
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@@ -112,20 +112,6 @@ extern int force_x, force_y; /* Don't query the BIOS for cols/rows */
extern int do_restore; /* Restore screen contents */
extern int graphic_mode; /* Graphics mode with linear frame buffer */
/*
* int $0x10 is notorious for touching registers it shouldn't.
* gcc doesn't like %ebp being clobbered, so define it as a push/pop
* sequence here.
*
* A number of systems, including the original PC can clobber %bp in
* certain circumstances, like when scrolling. There exists at least
* one Trident video card which could clobber DS under a set of
* circumstances that we are unlikely to encounter (scrolling when
* using an extended graphics mode of more than 800x600 pixels), but
* it's cheap insurance to deal with that here.
*/
#define INT10 "pushl %%ebp; pushw %%ds; int $0x10; popw %%ds; popl %%ebp"
/* Accessing VGA indexed registers */
static inline u8 in_idx(u16 port, u8 index)
{