From: H. Peter Anvin Date: Thu, 18 Feb 2010 02:32:06 +0000 (-0800) Subject: x86, setup: When restoring the screen, update boot_params.screen_info X-Git-Tag: firefly_0821_release~9833^2~3073^2~2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f1f6baf8f1df29be38003089787e378567ce0086;p=firefly-linux-kernel-4.4.55.git x86, setup: When restoring the screen, update boot_params.screen_info When we restore the screen content after a mode change, we return the cursor to its former position. However, we need to also update boot_params.screen_info accordingly, so that the decompression code knows where on the screen the cursor is. Just in case the video BIOS does something extra screwy, read the cursor position back from the BIOS instead of relying on it doing the right thing. While we're at it, make sure we cap the cursor position to the new screen coordinates. Reported-by: Wim Osterholt Bugzilla-Reference: http://bugzilla.kernel.org/show_bug.cgi?id=15329 Signed-off-by: H. Peter Anvin --- diff --git a/arch/x86/boot/video.c b/arch/x86/boot/video.c index f767164cd5df..43eda284d27f 100644 --- a/arch/x86/boot/video.c +++ b/arch/x86/boot/video.c @@ -298,11 +298,18 @@ static void restore_screen(void) } /* Restore cursor position */ + if (saved.curx >= xs) + saved.curx = xs-1; + if (saved.cury >= ys) + saved.cury = ys-1; + initregs(&ireg); ireg.ah = 0x02; /* Set cursor position */ ireg.dh = saved.cury; ireg.dl = saved.curx; intcall(0x10, &ireg, NULL); + + store_cursor_position(); } void set_video(void)