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Subject[PATCH] morse code panics for 2.5.62, take two
OK, there happen to be some (see below) who actually believe people
will go skimming the Linux kernel sources for morse code tables. ;)

v4:

o The morse table is now built using macros, which provides for
human readable codes while keeping the size of the table minimal.
(Jan-Benedict Glaw)

o Further minor clean-ups.
(Jan-Benedict Glaw & myself)

So what do I do to get this applied?

--
Tomas Szepe <szepe@pinerecords.com>


drivers/char/keyboard.c | 21 ++++
include/linux/morseops.h | 23 ++++
include/linux/vt_kern.h | 3
init/Kconfig | 15 +++
kernel/Makefile | 1
kernel/morse.c | 229 +++++++++++++++++++++++++++++++++++++++++++++++
kernel/panic.c | 4
7 files changed, 295 insertions(+), 1 deletion(-)


diff -urN a/drivers/char/keyboard.c b/drivers/char/keyboard.c
--- a/drivers/char/keyboard.c 2003-02-15 10:20:06.000000000 +0100
+++ b/drivers/char/keyboard.c 2003-02-21 12:28:43.000000000 +0100
@@ -260,6 +260,27 @@
}

/*
+ * Turn all possible leds on or off.
+ */
+void kd_turn_all_leds(int on_or_off)
+{
+ struct list_head *node;
+ on_or_off = on_or_off ? 1 : 0;
+
+ list_for_each(node, &kbd_handler.h_list) {
+ struct input_handle *handle = to_handle_h(node);
+ if (test_bit(EV_LED, handle->dev->evbit)) {
+ int led;
+ for (led = 0; led <= LED_MAX; led++) {
+ if (test_bit(led, handle->dev->ledbit))
+ input_event(handle->dev, EV_LED, led,
+ on_or_off);
+ }
+ }
+ }
+}
+
+/*
* Setting the keyboard rate.
*/
static inline unsigned int ms_to_jiffies(unsigned int ms) {
diff -urN a/include/linux/morseops.h b/include/linux/morseops.h
--- a/include/linux/morseops.h 1970-01-01 01:00:00.000000000 +0100
+++ b/include/linux/morseops.h 2003-02-21 12:28:43.000000000 +0100
@@ -0,0 +1,23 @@
+/* Yes, it's morse code ops indeed. */
+
+#ifndef _LINUX_MORSEOPS_H
+#define _LINUX_MORSEOPS_H
+
+#include <linux/config.h>
+
+#ifdef CONFIG_MORSE_PANICS
+
+extern const unsigned char morsetable[]; /* in kernel/morse.c */
+void panic_morseblink(char *buf); /* in kernel/morse.c */
+
+static inline unsigned char tomorse(char c) {
+ if (c >= 'a' && c <= 'z')
+ c -= 'a' - 'A';
+ return (c >= '"' && c <= '_') ? morsetable[c - '"'] : 0;
+}
+
+#else /* CONFIG_MORSE_PANICS */
+# define panic_morseblink(buf) do { } while (0)
+#endif /* CONFIG_MORSE_PANICS */
+
+#endif /* _LINUX_MORSEOPS_H */
diff -urN a/include/linux/vt_kern.h b/include/linux/vt_kern.h
--- a/include/linux/vt_kern.h 2002-12-16 07:01:55.000000000 +0100
+++ b/include/linux/vt_kern.h 2003-02-21 12:28:43.000000000 +0100
@@ -33,7 +33,10 @@
wait_queue_head_t paste_wait;
} *vt_cons[MAX_NR_CONSOLES];

+/* keyboard.c */
+
extern void kd_mksound(unsigned int hz, unsigned int ticks);
+extern void kd_turn_all_leds(int on_or_off);
extern int kbd_rate(struct kbd_repeat *rep);

/* console.c */
diff -urN a/init/Kconfig b/init/Kconfig
--- a/init/Kconfig 2003-02-11 01:09:48.000000000 +0100
+++ b/init/Kconfig 2003-02-21 12:28:43.000000000 +0100
@@ -98,6 +98,21 @@
13 => 8 KB
12 => 4 KB

+config MORSE_PANICS
+ bool "Morse code panics"
+ depends on VT
+ help
+ When enabled, this code will make a panicking kernel cry for
+ help in morse code, signalling on the leds of a possibly attached
+ keyboard and/or a bleeper. You can enable/disable your morse
+ output devices of choice using the "panicmorse" kernel boot
+ parameter. Currently, "panicmorse=0" will disable the signalling
+ completely, "panicmorse=1" (the default) will only blink the leds,
+ "panicmorse=2" will only beep, and "panicmorse=3" will do both.
+
+ If unsure, say Y. This feature is very helpful to those who
+ spend most of their time in X.
+
endmenu


diff -urN a/kernel/Makefile b/kernel/Makefile
--- a/kernel/Makefile 2003-02-11 01:09:48.000000000 +0100
+++ b/kernel/Makefile 2003-02-21 12:28:43.000000000 +0100
@@ -18,6 +18,7 @@
obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
obj-$(CONFIG_SOFTWARE_SUSPEND) += suspend.o
obj-$(CONFIG_COMPAT) += compat.o
+obj-$(CONFIG_MORSE_PANICS) += morse.o

ifneq ($(CONFIG_IA64),y)
# According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
diff -urN a/kernel/morse.c b/kernel/morse.c
--- a/kernel/morse.c 1970-01-01 01:00:00.000000000 +0100
+++ b/kernel/morse.c 2003-02-21 12:31:33.000000000 +0100
@@ -0,0 +1,229 @@
+/*
+ * kernel/morse.c
+ *
+ * Copyright (C) 2002 Andrew Rodland <arodland@noln.com>
+ * Copyright (C) 2003 Tomas Szepe <szepe@pinerecords.com>
+ *
+ * Tell the user who may be running in X and not see the console that
+ * we have panic'd. 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.
+ *
+ * And now it's done! LED and speaker morse code by Andrew Rodland
+ * <arodland@noln.com>, with improvements based on suggestions from
+ * linux@horizon.com and a host of others.
+ *
+ * Initial 2.5 morsepanics port and cleanup by
+ * Tomas Szepe <szepe@pinerecords.com>, January 2003.
+ *
+ * Cryptic morse code table replaced with meticulous macrowork by
+ * Jan-Benedict Glaw <jbglaw@lug-owl.de>, February 2003.
+ */
+
+#include <linux/config.h>
+#include <linux/morseops.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/vt_kern.h>
+
+#define DITLEN (HZ / 5)
+#define DAHLEN (3 * DITLEN)
+#define SPACELEN (7 * DITLEN)
+#define FREQ 844
+
+#define MORSE_OUTPUT_BLINK (1 << 0)
+#define MORSE_OUTPUT_BLEEP (1 << 1)
+#define MORSE_OUTPUT_ESTRADE (MORSE_OUTPUT_BLINK | MORSE_OUTPUT_BLEEP)
+
+static int morse_setting = MORSE_OUTPUT_BLINK;
+
+/* The following macros are used to make up the morse code table. */
+
+#define IS_DASH(letter, shift) \
+ ((letter) == '-' ? (1 << (shift)) : (0 << (shift)))
+#define MORSE(shift, b1, b2, b3, b4, b5, b6) \
+ (1 << (shift) | IS_DASH((b1), 5) | IS_DASH((b2), 4) \
+ | IS_DASH((b3), 3) | IS_DASH((b4), 2) \
+ | IS_DASH((b5), 1) | IS_DASH((b6), 0))
+#define MORSE0(letter) \
+ (0)
+#define MORSE1(letter, b1) \
+ MORSE(1, '.', '.', '.', '.', '.', (b1))
+#define MORSE2(letter, b1, b2) \
+ MORSE(2, '.', '.', '.', '.', (b1), (b2))
+#define MORSE3(letter, b1, b2, b3) \
+ MORSE(3, '.', '.', '.', (b1), (b2), (b3))
+#define MORSE4(letter, b1, b2, b3, b4) \
+ MORSE(4, '.', '.', (b1), (b1), (b3), (b4))
+#define MORSE5(letter, b1, b2, b3, b4, b5) \
+ MORSE(5, '.', (b1), (b2), (b3), (b4), (b5))
+#define MORSE6(letter, b1, b2, b3, b4, b5, b6) \
+ MORSE(6, (b1), (b2), (b3), (b4), (b5), (b6))
+
+/* Do not shuffle things about in here, the order matters. */
+const unsigned char morsetable[] = {
+
+ /* 0122, 0, 0310, 0, 0, 0163, "#$%&' */
+ MORSE6('"', '-', '.', '-', '-', '.', '-'),
+ MORSE0('#'),
+ 0310, /* '$': FIXME */
+ MORSE0('%'),
+ MORSE0('&'),
+ MORSE6('\'', '-', '.', '-', '.', '-', '-'),
+
+ /* 055, 0155, 0, 0, 0163, 0141, 0152, 0051, ()*+,-./ */
+ MORSE5('(', '-', '.', '-', '-', '.'),
+ MORSE6(')', '-', '.', '-', '-', '.', '-'),
+ MORSE0('*'),
+
+ /* http://www.vennfuessler.de/service/technik/morsen.html */
+ MORSE5('+', '.', '-', '.', '-', '.'),
+
+ MORSE6(',', '-', '-', '.', '.', '.', '-'),
+ MORSE6('-', '-', '.', '.', '.', '.', '-'),
+ MORSE6('.', '.', '-', '.', '-', '.', '-'),
+ MORSE5('/', '-', '.', '.', '-', '.'),
+
+ /* 077, 076, 074, 070, 060, 040, 041, 043, 047, 057, 0-9 */
+ MORSE5('0', '-', '-', '-', '-', '-'),
+ MORSE5('1', '.', '-', '-', '-', '-'),
+ MORSE5('2', '.', '.', '-', '-', '-'),
+ MORSE5('3', '.', '.', '.', '-', '-'),
+ MORSE5('4', '.', '.', '.', '.', '-'),
+ MORSE5('5', '.', '.', '.', '.', '.'),
+ MORSE5('6', '-', '.', '.', '.', '.'),
+ MORSE5('7', '-', '-', '.', '.', '.'),
+ MORSE5('8', '-', '-', '-', '.', '.'),
+ MORSE5('9', '-', '-', '-', '-', '.'),
+
+ /* 0107, 0125, 0, 0061, 0, 0114, 0, :;<=>?@ */
+ MORSE6(':', '-', '-', '-', '.', '.', '.'),
+ MORSE6(';', '-', '.', '-', '.', '-', '.'),
+ MORSE0('<'),
+ MORSE5('=', '-', '.', '.', '.', '-'),
+ MORSE0('>'),
+ MORSE6('?', '.', '.', '-', '-', '.', '.'),
+ MORSE0('@'),
+
+ /* 006, 021, 025, 011, 002, 024, 013, 020, 004, A-I */
+ MORSE2('A', '.', '-'),
+ MORSE4('B', '-', '.', '.', '.'),
+ MORSE4('C', '-', '.', '-', '.'),
+ MORSE3('D', '-', '.', '.'),
+ MORSE1('E', '.'),
+ MORSE4('F', '.', '.', '-', '.'),
+ MORSE3('G', '-', '-', '.'),
+ MORSE4('H', '.', '.', '.', '.'),
+ MORSE2('I', '.', '.'),
+
+ /* 036, 015, 022, 007, 005, 017, 026, 033, 012, J-R */
+ MORSE4('J', '.', '-', '-', '-'),
+ MORSE3('K', '-', '.', '-'),
+ MORSE4('L', '.', '-', '.', '.'),
+ MORSE2('M', '-', '-'),
+ MORSE2('N', '-', '.'),
+ MORSE3('O', '-', '-', '-'),
+ MORSE4('P', '.', '-', '-', '.'),
+ MORSE4('Q', '-', '-', '.', '-'),
+ MORSE3('R', '.', '-', '.'),
+
+ /* 010, 003, 014, 030, 016, 031, 035, 023, S-Z */
+ MORSE3('S', '.', '.', '.'),
+ MORSE1('T', '-'),
+ MORSE3('U', '.', '.', '-'),
+ MORSE4('V', '.', '.', '.', '-'),
+ MORSE3('W', '.', '-', '-'),
+ MORSE4('X', '-', '.', '.', '-'),
+ MORSE4('Y', '-', '.', '-', '-'),
+ MORSE4('Z', '-', '-', '.', '.'),
+
+ /* 0, 0, 0, 0, 0154 [\]^_ */
+ MORSE0('['),
+ MORSE0('\\'),
+ MORSE0(']'),
+ MORSE0('^'),
+ MORSE6('_', '.', '-', '-', '-', '.', '-'),
+};
+
+void panic_morseblink(char *buf)
+{
+ static unsigned long next_jiffie = 0;
+ static char *bufpos = 0;
+ static unsigned char morse = 0;
+ static char state = 1;
+
+ if (!(morse_setting & MORSE_OUTPUT_ESTRADE))
+ return;
+
+ if (!buf)
+ buf = "Uh oh, we lost the panic msg.";
+
+ /* Waiting for something? */
+ if (bufpos && time_after(next_jiffie, jiffies))
+ return;
+
+ if (state) { /* Coming off of a blink. */
+ if (morse_setting & MORSE_OUTPUT_BLINK)
+ kd_turn_all_leds(0);
+
+ state = 0;
+
+ if (morse > 1) {
+ /* Not done yet, just a one-dit pause. */
+ next_jiffie = jiffies + DITLEN;
+ } else {
+ /* Get a new char, figure out how much space. */
+
+ /* First time through. */
+ if (!bufpos)
+ bufpos = buf;
+
+ if (!*bufpos) {
+ /* Repeating. */
+ bufpos = buf;
+ next_jiffie = jiffies + SPACELEN;
+ } else {
+ /* Inter-letter space. */
+ next_jiffie = jiffies + DAHLEN;
+ }
+
+ if (!(morse = tomorse(*bufpos))) {
+ next_jiffie = jiffies + SPACELEN;
+ state = 1; /* And get us back here. */
+ }
+ bufpos++;
+ }
+ } else {
+ /* Starting a new blink. We have a valid code in morse. */
+ int len;
+
+ len = (morse & 0x01) ? DAHLEN : DITLEN;
+
+ if (morse_setting & MORSE_OUTPUT_BLEEP)
+ kd_mksound(FREQ, len);
+
+ if (morse_setting & MORSE_OUTPUT_BLINK)
+ kd_turn_all_leds(1);
+
+ next_jiffie = jiffies + len;
+
+ state = 1;
+ morse >>= 1;
+ }
+}
+
+static int __init panicmorse_setup(char *str)
+{
+ int par;
+ if (get_option(&str, &par))
+ morse_setting = par;
+ return 1;
+}
+
+/* "panicmorse=0" disables the blinking as it caused problems with
+ * certain console switches.
+ *
+ * "panicmorse | 1" does the show using kbd leds.
+ * "panicmorse | 2" throws in bleeping via kd_mksound().
+ */
+__setup("panicmorse=", panicmorse_setup);
diff -urN a/kernel/panic.c b/kernel/panic.c
--- a/kernel/panic.c 2003-01-09 14:25:40.000000000 +0100
+++ b/kernel/panic.c 2003-02-21 12:28:43.000000000 +0100
@@ -16,6 +16,7 @@
#include <linux/init.h>
#include <linux/sysrq.h>
#include <linux/interrupt.h>
+#include <linux/morseops.h>

asmlinkage void sys_sync(void); /* it's really int */

@@ -95,7 +96,8 @@
disabled_wait(caller);
#endif
local_irq_enable();
- for(;;) {
+ for (;;) {
+ panic_morseblink(buf);
CHECK_EMERGENCY_SYNC
}
}
-
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