1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef LINUX_CRASH_CORE_H
3#define LINUX_CRASH_CORE_H
4
5#include <linux/linkage.h>
6#include <linux/elfcore.h>
7#include <linux/elf.h>
8
9struct kimage;
10
11struct crash_mem {
12	unsigned int max_nr_ranges;
13	unsigned int nr_ranges;
14	struct range ranges[] __counted_by(max_nr_ranges);
15};
16
17#ifdef CONFIG_CRASH_DUMP
18
19int crash_shrink_memory(unsigned long new_size);
20ssize_t crash_get_memory_size(void);
21
22#ifndef arch_kexec_protect_crashkres
23/*
24 * Protection mechanism for crashkernel reserved memory after
25 * the kdump kernel is loaded.
26 *
27 * Provide an empty default implementation here -- architecture
28 * code may override this
29 */
30static inline void arch_kexec_protect_crashkres(void) { }
31#endif
32
33#ifndef arch_kexec_unprotect_crashkres
34static inline void arch_kexec_unprotect_crashkres(void) { }
35#endif
36
37
38
39#ifndef arch_crash_handle_hotplug_event
40static inline void arch_crash_handle_hotplug_event(struct kimage *image) { }
41#endif
42
43int crash_check_update_elfcorehdr(void);
44
45#ifndef crash_hotplug_cpu_support
46static inline int crash_hotplug_cpu_support(void) { return 0; }
47#endif
48
49#ifndef crash_hotplug_memory_support
50static inline int crash_hotplug_memory_support(void) { return 0; }
51#endif
52
53#ifndef crash_get_elfcorehdr_size
54static inline unsigned int crash_get_elfcorehdr_size(void) { return 0; }
55#endif
56
57/* Alignment required for elf header segment */
58#define ELF_CORE_HEADER_ALIGN   4096
59
60extern int crash_exclude_mem_range(struct crash_mem *mem,
61				   unsigned long long mstart,
62				   unsigned long long mend);
63extern int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
64				       void **addr, unsigned long *sz);
65
66struct kimage;
67struct kexec_segment;
68
69#define KEXEC_CRASH_HP_NONE			0
70#define KEXEC_CRASH_HP_ADD_CPU			1
71#define KEXEC_CRASH_HP_REMOVE_CPU		2
72#define KEXEC_CRASH_HP_ADD_MEMORY		3
73#define KEXEC_CRASH_HP_REMOVE_MEMORY		4
74#define KEXEC_CRASH_HP_INVALID_CPU		-1U
75
76extern void __crash_kexec(struct pt_regs *regs);
77extern void crash_kexec(struct pt_regs *regs);
78int kexec_should_crash(struct task_struct *p);
79int kexec_crash_loaded(void);
80void crash_save_cpu(struct pt_regs *regs, int cpu);
81extern int kimage_crash_copy_vmcoreinfo(struct kimage *image);
82
83#else /* !CONFIG_CRASH_DUMP*/
84struct pt_regs;
85struct task_struct;
86struct kimage;
87static inline void __crash_kexec(struct pt_regs *regs) { }
88static inline void crash_kexec(struct pt_regs *regs) { }
89static inline int kexec_should_crash(struct task_struct *p) { return 0; }
90static inline int kexec_crash_loaded(void) { return 0; }
91static inline void crash_save_cpu(struct pt_regs *regs, int cpu) {};
92static inline int kimage_crash_copy_vmcoreinfo(struct kimage *image) { return 0; };
93#endif /* CONFIG_CRASH_DUMP*/
94
95#endif /* LINUX_CRASH_CORE_H */
96