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