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/*
 *  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>
#include <linux/kexec.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

   /*
    * It's possible to come here directly from a panic-assertion and not
    * have preempt disabled. Some functions called from here want
    * preempt to be disabled. No point enabling it later though...
    */
   preempt_disable();

   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);

   /*
    * If we have crashed and we have a crash kernel loaded let it handle
    * everything else.
    * Do we want to call this before we try to display a message?
    */
   crash_kexec(NULL);

#ifdef CONFIG_SMP
   /*
    * Note smp_send_stop is the usual smp shutdown function, which
    * unfortunately means it may not be hardened to work in a panic
    * situation.
    */
   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++;
      }
      /*   This will not be a clean reboot, with everything
       *   shutting down.  But if there is a chance of
       *   rebooting the system it will be rebooted.
       */
      emergency_restart();
   }
#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);