diff options
| author | Jason Wessel <jason.wessel@windriver.com> | 2010-05-20 21:04:31 -0500 |
|---|---|---|
| committer | Jason Wessel <jason.wessel@windriver.com> | 2010-05-20 21:04:31 -0500 |
| commit | 61eaf539b9fb4926ed57e38f6545100c3432cf1b (patch) | |
| tree | e7053a803bd128e5c9e63dd659abb5fad05e80f7 | |
| parent | 9731191f75a54c4fa17e9b9b88f3144cf4b47836 (diff) | |
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>
| -rw-r--r-- | 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 b9c830c12b4..fa99bae75ac 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++; |