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x86: fix usage of bios intcall()

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Some intcall() misuses the input biosregs as output in
cf06de7b9c

This fixes the problem vga=ask boot option doesn't show enough modes.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
LKML-Reference: <20090701021307.GA3127@localhost.localdomain>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Akinobu Mita 2009-07-01 11:13:07 +09:00 committed by H. Peter Anvin
parent 22a26e6663
commit febe04de3b
2 changed files with 3 additions and 4 deletions
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3
arch/x86/boot/video-bios.c
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@ -37,14 +37,13 @@ static int set_bios_mode(u8 mode)
ireg.al = mode; /* AH=0x00 Set Video Mode */
intcall(0x10, &ireg, NULL);
ireg.ah = 0x0f; /* Get Current Video Mode */
intcall(0x10, &ireg, &oreg);
do_restore = 1; /* Assume video contents were lost */
/* Not all BIOSes are clean with the top bit */
new_mode = ireg.al & 0x7f;
new_mode = oreg.al & 0x7f;
if (new_mode == mode)
return 0; /* Mode change OK */

4
arch/x86/boot/video-vesa.c
View File

@ -45,7 +45,7 @@ static int vesa_probe(void)
ireg.di = (size_t)&vginfo;
intcall(0x10, &ireg, &oreg);
if (ireg.ax != 0x004f ||
if (oreg.ax != 0x004f ||
vginfo.signature != VESA_MAGIC ||
vginfo.version < 0x0102)
return 0; /* Not present */
@ -70,7 +70,7 @@ static int vesa_probe(void)
ireg.di = (size_t)&vminfo;
intcall(0x10, &ireg, &oreg);
if (ireg.ax != 0x004f)
if (oreg.ax != 0x004f)
continue;
if ((vminfo.mode_attr & 0x15) == 0x05) {