Fix Bug #1670509: wrong video attrs for int 10h, ah==13h The subroutine set_cursor_position is trashing %bx. Unfortunately, %bl contains the video attribute for write_string.
The fix saves %bx in the function prolog and restores it in the epilog. Also, remove save and restore in set_current_cursor, because set_cursor_position does it. Signed-off-by: herbierobinson <herbie.robin...@stratus.com> --- sgabios.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/sgabios.S b/sgabios.S index 275d063..da5acc2 100644 --- a/sgabios.S +++ b/sgabios.S @@ -1728,6 +1728,7 @@ write_string_tail: set_cursor_position: pushw %ax + pushw %bx pushw %ds pushw $BDA_SEG popw %ds /* ds = 0x40 */ @@ -1738,6 +1739,7 @@ set_cursor_position: movw %ax, %bx /* bx = cursor save offset */ movw %dx, (%bx) /* save new cursor value */ popw %ds + popw %bx popw %ax ret @@ -1752,12 +1754,10 @@ set_cursor_position: set_current_cursor: pushw %ds - pushw %bx pushw $BDA_SEG popw %ds /* ds = 0x40 */ movb BDA_ACTIVE_PAGE, %bh call set_cursor_position - popw %bx popw %ds ret -- 1.8.3.1
