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1/*
2 * Architecture specific (i386/x86_64) functions for kexec based crash dumps.
3 *
4 * Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
5 *
6 * Copyright (C) IBM Corporation, 2004. All rights reserved.
7 *
8 */
9
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>
19
20#include <asm/processor.h>
21#include <asm/hardirq.h>
22#include <asm/nmi.h>
23#include <asm/hw_irq.h>
24#include <asm/apic.h>
25#include <asm/hpet.h>
26#include <linux/kdebug.h>
27#include <asm/cpu.h>
28#include <asm/reboot.h>
29#include <asm/virtext.h>
30
31int in_crash_kexec;
32
33#if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
34
35static void kdump_nmi_callback(int cpu, struct pt_regs *regs)
36{
37#ifdef CONFIG_X86_32
38 struct pt_regs fixed_regs;
39#endif
40
41#ifdef CONFIG_X86_32
42 if (!user_mode_vm(regs)) {
43 crash_fixup_ss_esp(&fixed_regs, regs);
44 regs = &fixed_regs;
45 }
46#endif
47 crash_save_cpu(regs, cpu);
48
49 /* Disable VMX or SVM if needed.
50 *
51 * We need to disable virtualization on all CPUs.
52 * Having VMX or SVM enabled on any CPU may break rebooting
53 * after the kdump kernel has finished its task.
54 */
55 cpu_emergency_vmxoff();
56 cpu_emergency_svm_disable();
57
58 disable_local_APIC();
59}
60
61static void kdump_nmi_shootdown_cpus(void)
62{
63 in_crash_kexec = 1;
64 nmi_shootdown_cpus(kdump_nmi_callback);
65
66 disable_local_APIC();
67}
68
69#else
70static void kdump_nmi_shootdown_cpus(void)
71{
72 /* There are no cpus to shootdown */
73}
74#endif
75
76void native_machine_crash_shutdown(struct pt_regs *regs)
77{
78 /* This function is only called after the system
79 * has panicked or is otherwise in a critical state.
80 * The minimum amount of code to allow a kexec'd kernel
81 * to run successfully needs to happen here.
82 *
83 * In practice this means shooting down the other cpus in
84 * an SMP system.
85 */
86 /* The kernel is broken so disable interrupts */
87 local_irq_disable();
88
89 kdump_nmi_shootdown_cpus();
90
91 /* Booting kdump kernel with VMX or SVM enabled won't work,
92 * because (among other limitations) we can't disable paging
93 * with the virt flags.
94 */
95 cpu_emergency_vmxoff();
96 cpu_emergency_svm_disable();
97
98 lapic_shutdown();
99#if defined(CONFIG_X86_IO_APIC)
100 disable_IO_APIC();
101#endif
102#ifdef CONFIG_HPET_TIMER
103 hpet_disable();
104#endif
105 crash_save_cpu(regs, safe_smp_processor_id());
106}
1/*
2 * Architecture specific (i386/x86_64) functions for kexec based crash dumps.
3 *
4 * Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
5 *
6 * Copyright (C) IBM Corporation, 2004. All rights reserved.
7 *
8 */
9
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>
19
20#include <asm/processor.h>
21#include <asm/hardirq.h>
22#include <asm/nmi.h>
23#include <asm/hw_irq.h>
24#include <asm/apic.h>
25#include <asm/hpet.h>
26#include <linux/kdebug.h>
27#include <asm/cpu.h>
28#include <asm/reboot.h>
29#include <asm/virtext.h>
30
31int in_crash_kexec;
32
33#if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
34
35static void kdump_nmi_callback(int cpu, struct die_args *args)
36{
37 struct pt_regs *regs;
38#ifdef CONFIG_X86_32
39 struct pt_regs fixed_regs;
40#endif
41
42 regs = args->regs;
43
44#ifdef CONFIG_X86_32
45 if (!user_mode_vm(regs)) {
46 crash_fixup_ss_esp(&fixed_regs, regs);
47 regs = &fixed_regs;
48 }
49#endif
50 crash_save_cpu(regs, cpu);
51
52 /* Disable VMX or SVM if needed.
53 *
54 * We need to disable virtualization on all CPUs.
55 * Having VMX or SVM enabled on any CPU may break rebooting
56 * after the kdump kernel has finished its task.
57 */
58 cpu_emergency_vmxoff();
59 cpu_emergency_svm_disable();
60
61 disable_local_APIC();
62}
63
64static void kdump_nmi_shootdown_cpus(void)
65{
66 in_crash_kexec = 1;
67 nmi_shootdown_cpus(kdump_nmi_callback);
68
69 disable_local_APIC();
70}
71
72#else
73static void kdump_nmi_shootdown_cpus(void)
74{
75 /* There are no cpus to shootdown */
76}
77#endif
78
79void native_machine_crash_shutdown(struct pt_regs *regs)
80{
81 /* This function is only called after the system
82 * has panicked or is otherwise in a critical state.
83 * The minimum amount of code to allow a kexec'd kernel
84 * to run successfully needs to happen here.
85 *
86 * In practice this means shooting down the other cpus in
87 * an SMP system.
88 */
89 /* The kernel is broken so disable interrupts */
90 local_irq_disable();
91
92 kdump_nmi_shootdown_cpus();
93
94 /* Booting kdump kernel with VMX or SVM enabled won't work,
95 * because (among other limitations) we can't disable paging
96 * with the virt flags.
97 */
98 cpu_emergency_vmxoff();
99 cpu_emergency_svm_disable();
100
101 lapic_shutdown();
102#if defined(CONFIG_X86_IO_APIC)
103 disable_IO_APIC();
104#endif
105#ifdef CONFIG_HPET_TIMER
106 hpet_disable();
107#endif
108 crash_save_cpu(regs, safe_smp_processor_id());
109}