static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
{
unsigned char reason = 0;
int cpu;
cpu = smp_processor_id();
/* Only the BSP gets external NMIs from the system. */
if (!cpu)
reason = get_nmi_reason();
#if defined(CONFIG_SMP) && defined(CONFIG_KDB)
/*
* Call the kernel debugger to see if this NMI is due
* to an KDB requested IPI. If so, kdb will handle it.
*/
if (kdb_ipi(regs, NULL)) {
return;
}
#endif /* defined(CONFIG_SMP) && defined(CONFIG_KDB) */
if (!(reason & 0xc0)) {
if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
== NOTIFY_STOP)
return;
#ifdef CONFIG_X86_LOCAL_APIC
/*
* Ok, so this is none of the documented NMI sources,
* so it must be the NMI watchdog.
*/
if (nmi_watchdog_tick(regs, reason))
return;
if (!do_nmi_callback(regs, cpu))
unknown_nmi_error(reason, regs);
#else
unknown_nmi_error(reason, regs);
#endif
return;
}
if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
return;
/* AK: following checks seem to be broken on modern chipsets. FIXME */
if (reason & 0x80)
mem_parity_error(reason, regs);
if (reason & 0x40)
io_check_error(reason, regs);
#ifdef CONFIG_X86_32
/*
* Reassert NMI in case it became active meanwhile
* as it's edge-triggered:
*/
reassert_nmi();
#endif
}
/* called for each processor.. drop each into kdb. */
void smp_kdb_stop_proc(void)
{
kdb_ipi(kdb_smp_regs[smp_processor_id()], NULL);
}