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authorPoul-Henning Kamp <phk@FreeBSD.org>2003-02-27 21:07:36 +0000
committerPoul-Henning Kamp <phk@FreeBSD.org>2003-02-27 21:07:36 +0000
commite6258fb7749eeb2bef1603d5716287fc3a3c8efb (patch)
tree1030f1fe405343a5cbfec59b2978a107f4735ed3 /sys/sys/watchdog.h
parent9434c1a30b8586934eca8cd6c014820e0a302c49 (diff)
downloadsrc-e6258fb7749eeb2bef1603d5716287fc3a3c8efb.tar.gz
src-e6258fb7749eeb2bef1603d5716287fc3a3c8efb.zip
Add header file defining a simple, yet expressive watchdog interface
which can be implemented on all the watchdog hardware I know.
Notes
Notes: svn path=/head/; revision=111645
Diffstat (limited to 'sys/sys/watchdog.h')
-rw-r--r--sys/sys/watchdog.h76
1 files changed, 76 insertions, 0 deletions
diff --git a/sys/sys/watchdog.h b/sys/sys/watchdog.h
new file mode 100644
index 000000000000..cd2690b6ac30
--- /dev/null
+++ b/sys/sys/watchdog.h
@@ -0,0 +1,76 @@
+/*-
+ * Copyright (c) 2003 Poul-Henning Kamp
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+#ifndef _SYS_WATCHDOG_H
+#define _SYS__WATCHDOG_H
+
+#include <sys/ioccom.h>
+
+#define WDIOCPATPAT _IOW('W', 42, u_int)
+
+#define WD_ACTIVE 0x8000000
+ /*
+ * Watchdog reset, timeout set to value in WD_INTERVAL field.
+ * The kernel will arm the watchdog and unless the userland
+ * program calls WDIOCPATPAT again before the timer expires
+ * the system will reinitialize.
+ */
+
+#define WD_PASSIVE 0x0400000
+ /*
+ * Set the watchdog in passive mode.
+ * The kernel will chose an appropriate timeout duration and
+ * periodically reset the timer provided everything looks all
+ * right to the kernel.
+ */
+
+#define WD_INTERVAL 0x00000ff
+ /*
+ * Mask for duration bits.
+ * The watchdog will have a nominal patience of 2^N * nanoseconds.
+ * Example: N == 30 gives a patience of 2^30 nanoseconds ~= 1 second.
+ * NB: Expect variance in the +/- 10-20% range.
+ */
+
+#ifdef _KERNEL
+#define __WD_LEGAL (WD_ACTIVE | WD_PASSIVE | WD_INTERVAL)
+#endif
+
+/* Handy macros for humans not used to power of two nanoseconds */
+#define WD_TO_NEVER 0
+#define WD_TO_1MS 20
+#define WD_TO_125MS 27
+#define WD_TO_250MS 28
+#define WD_TO_500MS 29
+#define WD_TO_1SEC 30
+#define WD_TO_2SEC 31
+#define WD_TO_4SEC 32
+#define WD_TO_8SEC 33
+#define WD_TO_16SEC 34
+#define WD_TO_32SEC 35
+
+#endif /* _SYS_WATCHDOG_H */