[PATCH] morse code panics for 2.5.62

From: Tomas Szepe (szepe@pinerecords.com)
Date: Tue Feb 18 2003 - 08:50:38 EST


Hi Linus, Alan,

Morse code panics for 2.5.62:

o Completely arch-independent.
o No longer touches atkbd (as suggested by Vojtech Pavlik).
o With minimal changes to existing code.
o Introducing morse code ops -- a good hack value (MOST IMPORTANT!!).
o Useful to people who spend most of their time in X.

Please review,

-- 
Tomas Szepe <szepe@pinerecords.com>

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 2003-02-15 10:21:35.000000000 +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 2003-02-15 10:21:35.000000000 +0100 @@ -0,0 +1,26 @@ +/* Yes, it's morse code ops indeed. */ + +#ifndef _LINUX_MORSEOPS_H +#define _LINUX_MORSEOPS_H + +#include <linux/config.h> + +#if defined(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 = c - 'a' + 'A'; + if (c >= '"' && c <= '_') { + return morsetable[c - '"']; + } else + return 0; +} + +#else /* CONFIG_MORSE_PANICS */ + #define panic_morseblink(buf) +#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 2003-02-15 10:21:35.000000000 +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 2003-02-15 10:21:35.000000000 +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 2003-02-15 10:21:35.000000000 +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 ($(CONFIG_IA64),y) # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is diff -urN a/kernel/morse.c b/kernel/morse.c --- a/kernel/morse.c 1970-01-01 01:00:00.000000000 +0100 +++ b/kernel/morse.c 2003-02-15 10:21:35.000000000 +0100 @@ -0,0 +1,125 @@ +/* + * kernel/morse.c + * + * Copyright (C) 2002 Andrew Rodland <arodland@noln.com> + * Copyright (C) 2003 Tomas Szepe <szepe@pinerecords.com> + * + * Tell the user who may be running in X and not see the console that + * we have panic'd. This is to distingush panics from "real lockups." + * Could in theory send the panic message as morse, but that is left + * as an exercise for the reader. + * + * And now it's done! LED and speaker morse code by Andrew Rodland + * <arodland@noln.com>, with improvements based on suggestions from + * linux@horizon.com and a host of others. + * + * Initial 2.5 morsepanics port and cleanup by + * Tomas Szepe <szepe@pinerecords.com>, January 2003. + */ + +#include <linux/config.h> +#include <linux/morseops.h> +#include <linux/init.h> +#include <linux/jiffies.h> +#include <linux/vt_kern.h> + +#define DITLEN (HZ / 5) +#define DAHLEN (3 * DITLEN) +#define SPACELEN (7 * DITLEN) +#define FREQ 844 + +static int morse_setting = 1; + +const unsigned char morsetable[] = { + 0122, 0, 0310, 0, 0, 0163, /* "#$%&' */ + 055, 0155, 0, 0, 0163, 0141, 0152, 0051, /* ()*+,-./ */ + 077, 076, 074, 070, 060, 040, 041, 043, 047, 057, /* 0-9 */ + 0107, 0125, 0, 0061, 0, 0114, 0, /* :;<=>?@ */ + 006, 021, 025, 011, 002, 024, 013, 020, 004, /* A-I */ + 036, 015, 022, 007, 005, 017, 026, 033, 012, /* J-R */ + 010, 003, 014, 030, 016, 031, 035, 023, /* S-Z */ + 0, 0, 0, 0, 0154 /* [\]^_ */ +}; + +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) + 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 & 0x01) + 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 = (char *) buf; + + if (!*bufpos) { + /* Repeating */ + bufpos = (char *) 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 & 001) ? DAHLEN : DITLEN; + + if (morse_setting & 0x02) + kd_mksound(FREQ, len); + + next_jiffie = jiffies + len; + + if (morse_setting & 0x01) + kd_turn_all_leds(1); + + 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 2003-02-15 10:21:35.000000000 +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 } } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/



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