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authorJason Wessel <jason.wessel@windriver.com>2010-05-20 21:04:31 -0500
committerJason Wessel <jason.wessel@windriver.com>2010-05-20 21:04:31 -0500
commit61eaf539b9fb4926ed57e38f6545100c3432cf1b (patch)
treee7053a803bd128e5c9e63dd659abb5fad05e80f7 /arch/x86/kernel/early_printk.c
parent9731191f75a54c4fa17e9b9b88f3144cf4b47836 (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>
Diffstat (limited to 'arch/x86/kernel/early_printk.c')
-rw-r--r--arch/x86/kernel/early_printk.c8
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++;