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
9 struct kimage;
10
11 struct 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
19 int crash_shrink_memory(unsigned long new_size);
20 ssize_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 */
30 static inline void arch_kexec_protect_crashkres(void) { }
31 #endif
32
33 #ifndef arch_kexec_unprotect_crashkres
34 static inline void arch_kexec_unprotect_crashkres(void) { }
35 #endif
36
37
38
39 #ifndef arch_crash_handle_hotplug_event
40 static inline void arch_crash_handle_hotplug_event(struct kimage *image, void *arg) { }
41 #endif
42
43 int crash_check_hotplug_support(void);
44
45 #ifndef arch_crash_hotplug_support
46 static inline int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags)
47 {
48 return 0;
49 }
50 #endif
51
52 #ifndef crash_get_elfcorehdr_size
53 static inline unsigned int crash_get_elfcorehdr_size(void) { return 0; }
54 #endif
55
56 /* Alignment required for elf header segment */
57 #define ELF_CORE_HEADER_ALIGN 4096
58
59 extern int crash_exclude_mem_range(struct crash_mem *mem,
60 unsigned long long mstart,
61 unsigned long long mend);
62 extern int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
63 void **addr, unsigned long *sz);
64
65 struct kimage;
66 struct kexec_segment;
67
68 #define KEXEC_CRASH_HP_NONE 0
69 #define KEXEC_CRASH_HP_ADD_CPU 1
70 #define KEXEC_CRASH_HP_REMOVE_CPU 2
71 #define KEXEC_CRASH_HP_ADD_MEMORY 3
72 #define KEXEC_CRASH_HP_REMOVE_MEMORY 4
73 #define KEXEC_CRASH_HP_INVALID_CPU -1U
74
75 extern void __crash_kexec(struct pt_regs *regs);
76 extern void crash_kexec(struct pt_regs *regs);
77 int kexec_should_crash(struct task_struct *p);
78 int kexec_crash_loaded(void);
79 void crash_save_cpu(struct pt_regs *regs, int cpu);
80 extern int kimage_crash_copy_vmcoreinfo(struct kimage *image);
81
82 #else /* !CONFIG_CRASH_DUMP*/
83 struct pt_regs;
84 struct task_struct;
85 struct kimage;
86 static inline void __crash_kexec(struct pt_regs *regs) { }
87 static inline void crash_kexec(struct pt_regs *regs) { }
88 static inline int kexec_should_crash(struct task_struct *p) { return 0; }
89 static inline int kexec_crash_loaded(void) { return 0; }
90 static inline void crash_save_cpu(struct pt_regs *regs, int cpu) {};
91 static inline int kimage_crash_copy_vmcoreinfo(struct kimage *image) { return 0; };
92 #endif /* CONFIG_CRASH_DUMP*/
93
94 #endif /* LINUX_CRASH_CORE_H */
95
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