patch-2.4.19 linux-2.4.19/drivers/char/pc_keyb.c

• Lines: 44
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/drivers/char/pc_keyb.c
• Orig date: Fri Nov 9 14:01:21 2001

diff -urN linux-2.4.18/drivers/char/pc_keyb.c linux-2.4.19/drivers/char/pc_keyb.c
@@ -1215,3 +1215,43 @@
 }
 
 #endif /* CONFIG_PSMOUSE */
+
+
+static int blink_frequency = HZ/2;
+
+/* Tell the user who may be running in X and not see the console that we have 
+   panic'ed. This is to distingush panics from "real" lockups. 
+   Could in theory send the panic message as morse, but that is left as an
+   exercise for the reader.  */ 
+void panic_blink(void)
+{ 
+	static unsigned long last_jiffie;
+	static char led;
+	/* Roughly 1/2s frequency. KDB uses about 1s. Make sure it is 
+	   different. */
+	if (!blink_frequency) 
+		return;
+	if (jiffies - last_jiffie > blink_frequency) {
+		led ^= 0x01 | 0x04;
+		while (kbd_read_status() & KBD_STAT_IBF) mdelay(1); 
+		kbd_write_output(KBD_CMD_SET_LEDS);
+		mdelay(1); 
+		while (kbd_read_status() & KBD_STAT_IBF) mdelay(1); 
+		mdelay(1); 
+		kbd_write_output(led);
+		last_jiffie = jiffies;
+	}
+}  
+
+static int __init panicblink_setup(char *str)
+{
+    int par;
+    if (get_option(&str,&par)) 
+	    blink_frequency = par*(1000/HZ);
+    return 1;
+}
+
+/* panicblink=0 disables the blinking as it caused problems with some console
+   switches. otherwise argument is ms of a blink period. */
+__setup("panicblink=", panicblink_setup);
+