2 * Architecture specific (i386/x86_64) functions for kexec based crash dumps.
4 * Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
6 * Copyright (C) IBM Corporation, 2004. All rights reserved.
10 #include <linux/init.h>
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/smp.h>
14 #include <linux/reboot.h>
15 #include <linux/kexec.h>
16 #include <linux/delay.h>
17 #include <linux/elf.h>
18 #include <linux/elfcore.h>
20 #include <asm/processor.h>
21 #include <asm/hardirq.h>
23 #include <asm/hw_irq.h>
26 #include <linux/kdebug.h>
28 #include <asm/reboot.h>
33 #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
35 static void kdump_nmi_callback(int cpu, struct die_args *args)
39 struct pt_regs fixed_regs;
45 if (!user_mode_vm(regs)) {
46 crash_fixup_ss_esp(&fixed_regs, regs);
50 crash_save_cpu(regs, cpu);
55 static void kdump_nmi_shootdown_cpus(void)
57 nmi_shootdown_cpus(kdump_nmi_callback);
63 static void kdump_nmi_shootdown_cpus(void)
65 /* There are no cpus to shootdown */
69 void native_machine_crash_shutdown(struct pt_regs *regs)
71 /* This function is only called after the system
72 * has panicked or is otherwise in a critical state.
73 * The minimum amount of code to allow a kexec'd kernel
74 * to run successfully needs to happen here.
76 * In practice this means shooting down the other cpus in
79 /* The kernel is broken so disable interrupts */
82 kdump_nmi_shootdown_cpus();
84 #if defined(CONFIG_X86_IO_APIC)
87 #ifdef CONFIG_HPET_TIMER
90 crash_save_cpu(regs, safe_smp_processor_id());