1 files changed, 190 insertions, 0 deletions

diff --git a/arch/um/drivers/harddog_kern.c b/arch/um/drivers/harddog_kern.c
new file mode 100644
index 000000000000..147ec19f6bb9
--- /dev/null
+++ b/arch/um/drivers/harddog_kern.c
@@ -0,0 +1,190 @@
+/* UML hardware watchdog, shamelessly stolen from:
+ *
+ *      SoftDog 0.05:   A Software Watchdog Device
+ *
+ *      (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
+ *                              http://www.redhat.com
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ *      
+ *      Neither Alan Cox nor CymruNet Ltd. admit liability nor provide 
+ *      warranty for any of this software. This material is provided 
+ *      "AS-IS" and at no charge.       
+ *
+ *      (c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *
+ *      Software only watchdog driver. Unlike its big brother the WDT501P
+ *      driver this won't always recover a failed machine.
+ *
+ *  03/96: Angelo Haritsis <ah@doc.ic.ac.uk> :
+ *      Modularised.
+ *      Added soft_margin; use upon insmod to change the timer delay.
+ *      NB: uses same minor as wdt (WATCHDOG_MINOR); we could use separate
+ *          minors.
+ *
+ *  19980911 Alan Cox
+ *      Made SMP safe for 2.3.x
+ *
+ *  20011127 Joel Becker (jlbec@evilplan.org>
+ *      Added soft_noboot; Allows testing the softdog trigger without 
+ *      requiring a recompile.
+ *      Added WDIOC_GETTIMEOUT and WDIOC_SETTIMOUT.
+ */
+ 
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/reboot.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include "helper.h"
+#include "mconsole.h"
+
+MODULE_LICENSE("GPL");
+
+/* Locked by the BKL in harddog_open and harddog_release */
+static int timer_alive;
+static int harddog_in_fd = -1;
+static int harddog_out_fd = -1;
+
+/*
+ *      Allow only one person to hold it open
+ */
+ 
+extern int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock);
+
+static int harddog_open(struct inode *inode, struct file *file)
+{
+        int err;
+        char *sock = NULL;
+
+        lock_kernel();
+        if(timer_alive)
+                return -EBUSY;
+#ifdef CONFIG_HARDDOG_NOWAYOUT   
+        __module_get(THIS_MODULE);
+#endif
+
+#ifdef CONFIG_MCONSOLE
+        sock = mconsole_notify_socket();
+#endif
+        err = start_watchdog(&harddog_in_fd, &harddog_out_fd, sock);
+        if(err) return(err);
+
+        timer_alive = 1;
+        unlock_kernel();
+        return nonseekable_open(inode, file);
+}
+
+extern void stop_watchdog(int in_fd, int out_fd);
+
+static int harddog_release(struct inode *inode, struct file *file)
+{
+        /*
+         *      Shut off the timer.
+         */
+        lock_kernel();
+
+        stop_watchdog(harddog_in_fd, harddog_out_fd);
+        harddog_in_fd = -1;
+        harddog_out_fd = -1;
+
+        timer_alive=0;
+        unlock_kernel();
+        return 0;
+}
+
+extern int ping_watchdog(int fd);
+
+static ssize_t harddog_write(struct file *file, const char *data, size_t len,
+                             loff_t *ppos)
+{
+        /*
+         *      Refresh the timer.
+         */
+        if(len)
+                return(ping_watchdog(harddog_out_fd));
+        return 0;
+}
+
+static int harddog_ioctl(struct inode *inode, struct file *file,
+                         unsigned int cmd, unsigned long arg)
+{
+        static struct watchdog_info ident = {
+                WDIOC_SETTIMEOUT,
+                0,
+                "UML Hardware Watchdog"
+        };
+        switch (cmd) {
+                default:
+                        return -ENOTTY;
+                case WDIOC_GETSUPPORT:
+                        if(copy_to_user((struct harddog_info *)arg, &ident,
+                                        sizeof(ident)))
+                                return -EFAULT;
+                        return 0;
+                case WDIOC_GETSTATUS:
+                case WDIOC_GETBOOTSTATUS:
+                        return put_user(0,(int *)arg);
+                case WDIOC_KEEPALIVE:
+                        return(ping_watchdog(harddog_out_fd));
+        }
+}
+
+static struct file_operations harddog_fops = {
+        .owner          = THIS_MODULE,
+        .write          = harddog_write,
+        .ioctl          = harddog_ioctl,
+        .open           = harddog_open,
+        .release        = harddog_release,
+};
+
+static struct miscdevice harddog_miscdev = {
+        .minor          = WATCHDOG_MINOR,
+        .name           = "watchdog",
+        .fops           = &harddog_fops,
+};
+
+static char banner[] __initdata = KERN_INFO "UML Watchdog Timer\n";
+
+static int __init harddog_init(void)
+{
+        int ret;
+
+        ret = misc_register(&harddog_miscdev);
+
+        if (ret)
+                return ret;
+
+        printk(banner);
+
+        return(0);
+}
+
+static void __exit harddog_exit(void)
+{
+        misc_deregister(&harddog_miscdev);
+}
+
+module_init(harddog_init);
+module_exit(harddog_exit);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */