[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / panic.c

/*
 *  linux/kernel/panic.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

/*
 * This function is used through-out the kernel (including mm and fs)
 * to indicate a major problem.
 */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/notifier.h>
#include <linux/init.h>
#include <linux/sysrq.h>
#include <linux/interrupt.h>
#include <linux/nmi.h>

int panic_timeout;
int panic_on_oops;
int tainted;

EXPORT_SYMBOL(panic_timeout);

struct notifier_block *panic_notifier_list;

EXPORT_SYMBOL(panic_notifier_list);

static int __init panic_setup(char *str)
{
	panic_timeout = simple_strtoul(str, NULL, 0);
	return 1;
}
__setup("panic=", panic_setup);

static long no_blink(long time)
{
	return 0;
}

/* Returns how long it waited in ms */
long (*panic_blink)(long time);
EXPORT_SYMBOL(panic_blink);

/**
 *	panic - halt the system
 *	@fmt: The text string to print
 *
 *	Display a message, then perform cleanups.
 *
 *	This function never returns.
 */
 
NORET_TYPE void panic(const char * fmt, ...)
{
	long i;
	static char buf[1024];
	va_list args;
#if defined(CONFIG_ARCH_S390)
        unsigned long caller = (unsigned long) __builtin_return_address(0);
#endif

	bust_spinlocks(1);
	va_start(args, fmt);
	vsnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);
	printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
	bust_spinlocks(0);

#ifdef CONFIG_SMP
	smp_send_stop();
#endif

	notifier_call_chain(&panic_notifier_list, 0, buf);

	if (!panic_blink)
		panic_blink = no_blink;

	if (panic_timeout > 0)
	{
		/*
	 	 * Delay timeout seconds before rebooting the machine. 
		 * We can't use the "normal" timers since we just panicked..
	 	 */
		printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
		for (i = 0; i < panic_timeout*1000; ) {
			touch_nmi_watchdog();
			i += panic_blink(i);
			mdelay(1);
			i++;
		}
		/*
		 *	Should we run the reboot notifier. For the moment Im
		 *	choosing not too. It might crash, be corrupt or do
		 *	more harm than good for other reasons.
		 */
		machine_restart(NULL);
	}
#ifdef __sparc__
	{
		extern int stop_a_enabled;
		/* Make sure the user can actually press Stop-A (L1-A) */
		stop_a_enabled = 1;
		printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n");
	}
#endif
#if defined(CONFIG_ARCH_S390)
        disabled_wait(caller);
#endif
	local_irq_enable();
	for (i = 0;;) {
		i += panic_blink(i);
		mdelay(1);
		i++;
	}
}

EXPORT_SYMBOL(panic);

/**
 *	print_tainted - return a string to represent the kernel taint state.
 *
 *  'P' - Proprietary module has been loaded.
 *  'F' - Module has been forcibly loaded.
 *  'S' - SMP with CPUs not designed for SMP.
 *  'R' - User forced a module unload.
 *  'M' - Machine had a machine check experience.
 *  'B' - System has hit bad_page.
 *
 *	The string is overwritten by the next call to print_taint().
 */
 
const char *print_tainted(void)
{
	static char buf[20];
	if (tainted) {
		snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c",
			tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
			tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
			tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
			tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
 			tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
			tainted & TAINT_BAD_PAGE ? 'B' : ' ');
	}
	else
		snprintf(buf, sizeof(buf), "Not tainted");
	return(buf);
}

void add_taint(unsigned flag)
{
	tainted |= flag;
}
EXPORT_SYMBOL(add_taint);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/kernel/panic.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*/
	6
	7	/*
	8	* This function is used through-out the kernel (including mm and fs)
	9	* to indicate a major problem.
	10	*/
	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
	22	int panic_timeout;
	23	int panic_on_oops;
	24	int tainted;
	25
	26	EXPORT_SYMBOL(panic_timeout);
	27
	28	struct notifier_block *panic_notifier_list;
	29
	30	EXPORT_SYMBOL(panic_notifier_list);
	31
	32	static int __init panic_setup(char *str)
	33	{
	34	panic_timeout = simple_strtoul(str, NULL, 0);
	35	return 1;
	36	}
	37	__setup("panic=", panic_setup);
	38
	39	static long no_blink(long time)
	40	{
	41	return 0;
	42	}
	43
	44	/* Returns how long it waited in ms */
	45	long (*panic_blink)(long time);
	46	EXPORT_SYMBOL(panic_blink);
	47
	48	/**
	49	* panic - halt the system
	50	* @fmt: The text string to print
	51	*
	52	* Display a message, then perform cleanups.
	53	*
	54	* This function never returns.
	55	*/
	56
	57	NORET_TYPE void panic(const char * fmt, ...)
	58	{
	59	long i;
	60	static char buf[1024];
	61	va_list args;
	62	#if defined(CONFIG_ARCH_S390)
	63	unsigned long caller = (unsigned long) __builtin_return_address(0);
	64	#endif
65
66	bust_spinlocks(1);
67	va_start(args, fmt);
68	vsnprintf(buf, sizeof(buf), fmt, args);
69	va_end(args);
70	printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
71	bust_spinlocks(0);
72
73	#ifdef CONFIG_SMP
74	smp_send_stop();
75	#endif
76
77	notifier_call_chain(&panic_notifier_list, 0, buf);
78
79	if (!panic_blink)
80	panic_blink = no_blink;
81
82	if (panic_timeout > 0)
83	{
84	/*
85	* Delay timeout seconds before rebooting the machine.
86	* We can't use the "normal" timers since we just panicked..
87	*/
88	printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
89	for (i = 0; i < panic_timeout*1000; ) {
90	touch_nmi_watchdog();
91	i += panic_blink(i);
92	mdelay(1);
93	i++;
94	}
95	/*
96	* Should we run the reboot notifier. For the moment Im
97	* choosing not too. It might crash, be corrupt or do
98	* more harm than good for other reasons.
99	*/
100	machine_restart(NULL);
101	}
102	#ifdef __sparc__
103	{
104	extern int stop_a_enabled;
a271c241	105	/* Make sure the user can actually press Stop-A (L1-A) */
1da177e4	106	stop_a_enabled = 1;
a271c241	107	printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n");
1da177e4 LT	108	}
	109	#endif
	110	#if defined(CONFIG_ARCH_S390)
	111	disabled_wait(caller);
	112	#endif
	113	local_irq_enable();
	114	for (i = 0;;) {
	115	i += panic_blink(i);
	116	mdelay(1);
	117	i++;
	118	}
	119	}
	120
	121	EXPORT_SYMBOL(panic);
	122
	123	/**
	124	* print_tainted - return a string to represent the kernel taint state.
	125	*
	126	* 'P' - Proprietary module has been loaded.
	127	* 'F' - Module has been forcibly loaded.
	128	* 'S' - SMP with CPUs not designed for SMP.
	129	* 'R' - User forced a module unload.
	130	* 'M' - Machine had a machine check experience.
	131	* 'B' - System has hit bad_page.
	132	*
	133	* The string is overwritten by the next call to print_taint().
	134	*/
	135
	136	const char *print_tainted(void)
	137	{
	138	static char buf[20];
	139	if (tainted) {
	140	snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c",
	141	tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
	142	tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
	143	tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
	144	tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
	145	tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
	146	tainted & TAINT_BAD_PAGE ? 'B' : ' ');
	147	}
	148	else
	149	snprintf(buf, sizeof(buf), "Not tainted");
	150	return(buf);
	151	}
	152
	153	void add_taint(unsigned flag)
	154	{
	155	tainted \|= flag;
	156	}
	157	EXPORT_SYMBOL(add_taint);