4 * Copyright (C) 1991, 1992 Linus Torvalds
8 * This function is used through-out the kernel (including mm and fs)
9 * to indicate a major problem.
11 #include <linux/config.h>
12 #include <linux/module.h>
13 #include <linux/sched.h>
14 #include <linux/delay.h>
15 #include <linux/reboot.h>
16 #include <linux/notifier.h>
17 #include <linux/init.h>
18 #include <linux/sysrq.h>
19 #include <linux/interrupt.h>
20 #include <linux/nmi.h>
21 #include <linux/kexec.h>
22 #include <linux/crash_dump.h>
24 int panic_timeout = 900;
25 int panic_on_oops = 1;
29 void (*dump_function_ptr)(const char *, const struct pt_regs *) = 0;
31 EXPORT_SYMBOL(panic_timeout);
32 EXPORT_SYMBOL(dump_function_ptr);
34 struct notifier_block *panic_notifier_list;
36 EXPORT_SYMBOL(panic_notifier_list);
38 static int __init panic_setup(char *str)
40 panic_timeout = simple_strtoul(str, NULL, 0);
43 __setup("panic=", panic_setup);
45 static long no_blink(long time)
50 /* Returns how long it waited in ms */
51 long (*panic_blink)(long time);
52 EXPORT_SYMBOL(panic_blink);
55 * panic - halt the system
56 * @fmt: The text string to print
58 * Display a message, then perform cleanups.
60 * This function never returns.
63 NORET_TYPE void panic(const char * fmt, ...)
66 static char buf[1024];
68 #if defined(CONFIG_ARCH_S390)
69 unsigned long caller = (unsigned long) __builtin_return_address(0);
74 vsnprintf(buf, sizeof(buf), fmt, args);
76 printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
82 /* If we have crashed, perform a kexec reboot, for dump write-out */
83 crash_machine_kexec();
85 notifier_call_chain(&panic_notifier_list, 0, buf);
91 notifier_call_chain(&panic_notifier_list, 0, buf);
94 panic_blink = no_blink;
96 if (panic_timeout > 0)
99 * Delay timeout seconds before rebooting the machine.
100 * We can't use the "normal" timers since we just panicked..
102 printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
105 struct kimage *image;
106 image = xchg(&kexec_image, 0);
108 printk(KERN_EMERG "by starting a new kernel ..\n");
109 mdelay(panic_timeout*1000);
110 machine_kexec(image);
114 for (i = 0; i < panic_timeout*1000; ) {
115 touch_nmi_watchdog();
121 * Should we run the reboot notifier. For the moment Im
122 * choosing not too. It might crash, be corrupt or do
123 * more harm than good for other reasons.
125 machine_restart(NULL);
129 extern int stop_a_enabled;
130 /* Make sure the user can actually press Stop-A (L1-A) */
132 printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n");
135 #if defined(CONFIG_ARCH_S390)
136 disabled_wait(caller);
146 EXPORT_SYMBOL(panic);
149 * print_tainted - return a string to represent the kernel taint state.
151 * 'P' - Proprietary module has been loaded.
152 * 'F' - Module has been forcibly loaded.
153 * 'S' - SMP with CPUs not designed for SMP.
154 * 'R' - User forced a module unload.
155 * 'M' - Machine had a machine check experience.
156 * 'B' - System has hit bad_page.
158 * The string is overwritten by the next call to print_taint().
161 const char *print_tainted(void)
165 snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c",
166 tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
167 tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
168 tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
169 tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
170 tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
171 tainted & TAINT_BAD_PAGE ? 'B' : ' ');
174 snprintf(buf, sizeof(buf), "Not tainted");
177 EXPORT_SYMBOL(print_tainted);
179 void add_taint(unsigned flag)
183 EXPORT_SYMBOL(add_taint);
185 int check_tainted(void)
189 EXPORT_SYMBOL_GPL(check_tainted);