#include <linux/module.h>
#include <linux/init.h>
#include <linux/notifier.h>
#include <asm/hypervisor.h>

MODULE_LICENSE("GPL");

#ifdef __ia64__
static void
xen_panic_hypercall(struct unw_frame_info *info, void *arg)
{
	current->thread.ksp = (__u64)info->sw - 16;
	HYPERVISOR_shutdown(SHUTDOWN_crash);
	/* we're never actually going to get here... */
}
#endif

static int
xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
{
#ifdef __ia64__
	unw_init_running(xen_panic_hypercall, NULL);
#else /* !__ia64__ */
	HYPERVISOR_shutdown(SHUTDOWN_crash);
#endif
	/* we're never actually going to get here... */
	return NOTIFY_DONE;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
static struct notifier_block xen_panic_block = {
	xen_panic_event, NULL, 0 /* try to go last */
};
#else
static struct notifier_block xen_panic_block = {
	.notifier_call= xen_panic_event,
	.next= NULL,
	.priority= 0/* try to go last */
};
#endif /*LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)*/

static int __init setup_panic_event(void)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
	notifier_chain_register(&panic_notifier_list, &xen_panic_block);
#else
	atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block);
#endif /*LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)*/
	return 0;
}

int xen_panic_handler_init(void)
{
	return setup_panic_event();
}