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#ifdef CONFIG_CRASH_DM_CRYPT
38int crash_load_dm_crypt_keys(struct kimage *image);
39ssize_t dm_crypt_keys_read(char *buf, size_t count, u64 *ppos);
40#else
41static inline int crash_load_dm_crypt_keys(struct kimage *image) {return 0; }
42#endif
43
44#ifndef arch_crash_handle_hotplug_event
45static inline void arch_crash_handle_hotplug_event(struct kimage *image, void *arg) { }
46#endif
47
48int crash_check_hotplug_support(void);
49
50#ifndef arch_crash_hotplug_support
51static inline int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags)
52{
53 return 0;
54}
55#endif
56
57#ifndef crash_get_elfcorehdr_size
58static inline unsigned int crash_get_elfcorehdr_size(void) { return 0; }
59#endif
60
61/* Alignment required for elf header segment */
62#define ELF_CORE_HEADER_ALIGN 4096
63
64extern int crash_exclude_mem_range(struct crash_mem *mem,
65 unsigned long long mstart,
66 unsigned long long mend);
67extern int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
68 void **addr, unsigned long *sz);
69
70struct kimage;
71struct kexec_segment;
72
73#define KEXEC_CRASH_HP_NONE 0
74#define KEXEC_CRASH_HP_ADD_CPU 1
75#define KEXEC_CRASH_HP_REMOVE_CPU 2
76#define KEXEC_CRASH_HP_ADD_MEMORY 3
77#define KEXEC_CRASH_HP_REMOVE_MEMORY 4
78#define KEXEC_CRASH_HP_INVALID_CPU -1U
79
80extern void __crash_kexec(struct pt_regs *regs);
81extern void crash_kexec(struct pt_regs *regs);
82int kexec_should_crash(struct task_struct *p);
83int kexec_crash_loaded(void);
84void crash_save_cpu(struct pt_regs *regs, int cpu);
85extern int kimage_crash_copy_vmcoreinfo(struct kimage *image);
86
87#else /* !CONFIG_CRASH_DUMP*/
88struct pt_regs;
89struct task_struct;
90struct kimage;
91static inline void __crash_kexec(struct pt_regs *regs) { }
92static inline void crash_kexec(struct pt_regs *regs) { }
93static inline int kexec_should_crash(struct task_struct *p) { return 0; }
94static inline int kexec_crash_loaded(void) { return 0; }
95static inline void crash_save_cpu(struct pt_regs *regs, int cpu) {};
96static inline int kimage_crash_copy_vmcoreinfo(struct kimage *image) { return 0; };
97#endif /* CONFIG_CRASH_DUMP*/
98
99#endif /* LINUX_CRASH_CORE_H */
100