2 * Copyright (c) 2003 Poul-Henning Kamp
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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9 * notice, this list of conditions and the following disclaimer.
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14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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28 #ifndef _SYS_WATCHDOG_H
29 #define _SYS_WATCHDOG_H
31 #include <sys/ioccom.h>
33 #define WDIOCPATPAT _IOW('W', 42, u_int)
35 #define WD_ACTIVE 0x8000000
37 * Watchdog reset, timeout set to value in WD_INTERVAL field.
38 * The kernel will arm the watchdog and unless the userland
39 * program calls WDIOCPATPAT again before the timer expires
40 * the system will reinitialize.
43 #define WD_PASSIVE 0x0400000
45 * Set the watchdog in passive mode.
46 * The kernel will chose an appropriate timeout duration and
47 * periodically reset the timer provided everything looks all
48 * right to the kernel.
51 #define WD_INTERVAL 0x00000ff
53 * Mask for duration bits.
54 * The watchdog will have a nominal patience of 2^N * nanoseconds.
55 * Example: N == 30 gives a patience of 2^30 nanoseconds ~= 1 second.
56 * NB: Expect variance in the +/- 10-20% range.
60 #define __WD_LEGAL (WD_ACTIVE | WD_PASSIVE | WD_INTERVAL)
63 /* Handy macros for humans not used to power of two nanoseconds */
66 #define WD_TO_125MS 27
67 #define WD_TO_250MS 28
68 #define WD_TO_500MS 29
73 #define WD_TO_16SEC 34
74 #define WD_TO_32SEC 35
76 #endif /* _SYS_WATCHDOG_H */