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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#ifndef arch_crash_handle_hotplug_event
38static inline void arch_crash_handle_hotplug_event(struct kimage *image, void *arg) { }
39#endif
40
41int crash_check_hotplug_support(void);
42
43#ifndef arch_crash_hotplug_support
44static inline int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags)
45{
46 return 0;
47}
48#endif
49
50#ifndef crash_get_elfcorehdr_size
51static inline unsigned int crash_get_elfcorehdr_size(void) { return 0; }
52#endif
53
54/* Alignment required for elf header segment */
55#define ELF_CORE_HEADER_ALIGN 4096
56
57extern int crash_exclude_mem_range(struct crash_mem *mem,
58 unsigned long long mstart,
59 unsigned long long mend);
60extern int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
61 void **addr, unsigned long *sz);
62extern int crash_prepare_headers(int need_kernel_map, void **addr,
63 unsigned long *sz, unsigned long *nr_mem_ranges);
64extern int crash_exclude_core_ranges(struct crash_mem **cmem);
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);
82extern unsigned int arch_get_system_nr_ranges(void);
83extern int arch_crash_populate_cmem(struct crash_mem *cmem);
84extern int arch_crash_exclude_ranges(struct crash_mem *cmem);
85extern int arch_crash_exclude_mem_range(struct crash_mem **mem,
86 unsigned long long mstart,
87 unsigned long long mend);
88
89#else /* !CONFIG_CRASH_DUMP*/
90struct pt_regs;
91struct task_struct;
92struct kimage;
93static inline void __crash_kexec(struct pt_regs *regs) { }
94static inline void crash_kexec(struct pt_regs *regs) { }
95static inline int kexec_should_crash(struct task_struct *p) { return 0; }
96static inline int kexec_crash_loaded(void) { return 0; }
97static inline void crash_save_cpu(struct pt_regs *regs, int cpu) {};
98static inline int kimage_crash_copy_vmcoreinfo(struct kimage *image) { return 0; };
99#endif /* CONFIG_CRASH_DUMP*/
100
101#ifdef CONFIG_CRASH_DM_CRYPT
102int crash_load_dm_crypt_keys(struct kimage *image);
103ssize_t dm_crypt_keys_read(char *buf, size_t count, u64 *ppos);
104#else
105static inline int crash_load_dm_crypt_keys(struct kimage *image) {return 0; }
106#endif
107
108#endif /* LINUX_CRASH_CORE_H */