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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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95
arch/x86/boot/video-vga.c
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@@ -2,6 +2,7 @@
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright 2007 rPath, Inc. - All Rights Reserved
* Copyright 2009 Intel Corporation; author H. Peter Anvin
*
* This file is part of the Linux kernel, and is made available under
* the terms of the GNU General Public License version 2.
@@ -39,30 +40,30 @@ static __videocard video_vga;
/* Set basic 80x25 mode */
static u8 vga_set_basic_mode(void)
{
struct biosregs ireg, oreg;
u16 ax;
u8 rows;
u8 mode;
initregs(&ireg);
#ifdef CONFIG_VIDEO_400_HACK
if (adapter >= ADAPTER_VGA) {
asm volatile(INT10
: : "a" (0x1202), "b" (0x0030)
: "ecx", "edx", "esi", "edi");
ireg.ax = 0x1202;
ireg.bx = 0x0030;
intcall(0x10, &ireg, NULL);
}
#endif
ax = 0x0f00;
asm volatile(INT10
: "+a" (ax)
: : "ebx", "ecx", "edx", "esi", "edi");
mode = (u8)ax;
intcall(0x10, &ireg, &oreg);
mode = oreg.al;
set_fs(0);
rows = rdfs8(0x484); /* rows minus one */
#ifndef CONFIG_VIDEO_400_HACK
if ((ax == 0x5003 || ax == 0x5007) &&
if ((oreg.ax == 0x5003 || oreg.ax == 0x5007) &&
(rows == 0 || rows == 24))
return mode;
#endif
@@ -71,10 +72,8 @@ static u8 vga_set_basic_mode(void)
mode = 3;
/* Set the mode */
ax = mode;
asm volatile(INT10
: "+a" (ax)
: : "ebx", "ecx", "edx", "esi", "edi");
ireg.ax = mode; /* AH=0: set mode */
intcall(0x10, &ireg, NULL);
do_restore = 1;
return mode;
}
@@ -82,43 +81,69 @@ static u8 vga_set_basic_mode(void)
static void vga_set_8font(void)
{
/* Set 8x8 font - 80x43 on EGA, 80x50 on VGA */
struct biosregs ireg;
initregs(&ireg);
/* Set 8x8 font */
asm volatile(INT10 : : "a" (0x1112), "b" (0));
ireg.ax = 0x1112;
/* ireg.bl = 0; */
intcall(0x10, &ireg, NULL);
/* Use alternate print screen */
asm volatile(INT10 : : "a" (0x1200), "b" (0x20));
ireg.ax = 0x1200;
ireg.bl = 0x20;
intcall(0x10, &ireg, NULL);
/* Turn off cursor emulation */
asm volatile(INT10 : : "a" (0x1201), "b" (0x34));
ireg.ax = 0x1201;
ireg.bl = 0x34;
intcall(0x10, &ireg, NULL);
/* Cursor is scan lines 6-7 */
asm volatile(INT10 : : "a" (0x0100), "c" (0x0607));
ireg.ax = 0x0100;
ireg.cx = 0x0607;
intcall(0x10, &ireg, NULL);
}
static void vga_set_14font(void)
{
/* Set 9x14 font - 80x28 on VGA */
struct biosregs ireg;
initregs(&ireg);
/* Set 9x14 font */
asm volatile(INT10 : : "a" (0x1111), "b" (0));
ireg.ax = 0x1111;
/* ireg.bl = 0; */
intcall(0x10, &ireg, NULL);
/* Turn off cursor emulation */
asm volatile(INT10 : : "a" (0x1201), "b" (0x34));
ireg.ax = 0x1201;
ireg.bl = 0x34;
intcall(0x10, &ireg, NULL);
/* Cursor is scan lines 11-12 */
asm volatile(INT10 : : "a" (0x0100), "c" (0x0b0c));
ireg.ax = 0x0100;
ireg.cx = 0x0b0c;
intcall(0x10, &ireg, NULL);
}
static void vga_set_80x43(void)
{
/* Set 80x43 mode on VGA (not EGA) */
struct biosregs ireg;
initregs(&ireg);
/* Set 350 scans */
asm volatile(INT10 : : "a" (0x1201), "b" (0x30));
ireg.ax = 0x1201;
ireg.bl = 0x30;
intcall(0x10, &ireg, NULL);
/* Reset video mode */
asm volatile(INT10 : : "a" (0x0003));
ireg.ax = 0x0003;
intcall(0x10, &ireg, NULL);
vga_set_8font();
}
@@ -225,8 +250,6 @@ static int vga_set_mode(struct mode_info *mode)
*/
static int vga_probe(void)
{
u16 ega_bx;
static const char *card_name[] = {
"CGA/MDA/HGC", "EGA", "VGA"
};
@@ -240,26 +263,26 @@ static int vga_probe(void)
sizeof(ega_modes)/sizeof(struct mode_info),
sizeof(vga_modes)/sizeof(struct mode_info),
};
u8 vga_flag;
asm(INT10
: "=b" (ega_bx)
: "a" (0x1200), "b" (0x10) /* Check EGA/VGA */
: "ecx", "edx", "esi", "edi");
struct biosregs ireg, oreg;
initregs(&ireg);
ireg.ax = 0x1200;
ireg.bl = 0x10; /* Check EGA/VGA */
intcall(0x10, &ireg, &oreg);
#ifndef _WAKEUP
boot_params.screen_info.orig_video_ega_bx = ega_bx;
boot_params.screen_info.orig_video_ega_bx = oreg.bx;
#endif
/* If we have MDA/CGA/HGC then BL will be unchanged at 0x10 */
if ((u8)ega_bx != 0x10) {
if (oreg.bl != 0x10) {
/* EGA/VGA */
asm(INT10
: "=a" (vga_flag)
: "a" (0x1a00)
: "ebx", "ecx", "edx", "esi", "edi");
ireg.ax = 0x1a00;
intcall(0x10, &ireg, &oreg);
if (vga_flag == 0x1a) {
if (oreg.al == 0x1a) {
adapter = ADAPTER_VGA;
#ifndef _WAKEUP
boot_params.screen_info.orig_video_isVGA = 1;