Commit f1f6baf8 authored Feb 17, 2010 by H. Peter Anvin

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 <wim@djo.tudelft.nl>
Bugzilla-Reference: http://bugzilla.kernel.org/show_bug.cgi?id=15329


Signed-off-by: H. Peter Anvin <hpa@zytor.com>

parent b0483e78

arch/x86/boot/video.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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)

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