[PATCH 6/7] earlyprintk,vga,kdb: Fix \b and \r for earlyprintk=vga with kdb
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From: Jason Wessel on 18 May 2010 21:50 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(a)linutronix.de> CC: Ingo Molnar <mingo(a)redhat.com> CC: H. Peter Anvin <hpa(a)zytor.com> CC: x86(a)kernel.org Signed-off-by: Jason Wessel <jason.wessel(a)windriver.com> --- arch/x86/kernel/early_printk.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c index b9c830c..fa99bae 100644 --- a/arch/x86/kernel/early_printk.c +++ b/arch/x86/kernel/early_printk.c @@ -41,6 +41,14 @@ static void early_vga_write(struct console *con, const char *str, unsigned n) writew(0x720, VGABASE + 2*(max_xpos*j + 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++; -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |