Commit 61eaf539 authored May 20, 2010 by Jason Wessel

earlyprintk,vga,kdb: Fix \b and \r for earlyprintk=vga with kdb



Allow kdb to work properly with with earlyprintk=vga by interpreting
the backspace and carriage return output characters.  These
interpretation of these characters is used for simple line editing
provided in the kdb shell.

CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@redhat.com>
CC: H. Peter Anvin <hpa@zytor.com>
CC: x86@kernel.org
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>

parent 9731191f

arch/x86/kernel/early_printk.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -41,6 +41,14 @@ static void early_vga_write(struct console con, const char str, unsigned n)
		writew(0x720, VGABASE + 2(max_xposj + i));
		current_ypos = max_ypos-1;
		}
		#ifdef CONFIG_KGDB_KDB
		if (c == '\b') {
		if (current_xpos > 0)
		current_xpos--;
		} else if (c == '\r') {
		current_xpos = 0;
		} else
		#endif
		if (c == '\n') {
		current_xpos = 0;
		current_ypos++;