#ifndef LINUX_KEXEC_H #define LINUX_KEXEC_H #ifdef CONFIG_KEXEC #include #include #include #include #include #include #include #include /* Verify architecture specific macros are defined */ #ifndef KEXEC_SOURCE_MEMORY_LIMIT #error KEXEC_SOURCE_MEMORY_LIMIT not defined #endif #ifndef KEXEC_DESTINATION_MEMORY_LIMIT #error KEXEC_DESTINATION_MEMORY_LIMIT not defined #endif #ifndef KEXEC_CONTROL_MEMORY_LIMIT #error KEXEC_CONTROL_MEMORY_LIMIT not defined #endif #ifndef KEXEC_CONTROL_PAGE_SIZE #error KEXEC_CONTROL_PAGE_SIZE not defined #endif #ifndef KEXEC_ARCH #error KEXEC_ARCH not defined #endif #define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4) #define KEXEC_CORE_NOTE_NAME "CORE" #define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4) #define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4) /* * The per-cpu notes area is a list of notes terminated by a "NULL" * note header. For kdump, the code in vmcore.c runs in the context * of the second kernel to combine them into one note. */ #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \ KEXEC_CORE_NOTE_NAME_BYTES + \ KEXEC_CORE_NOTE_DESC_BYTES ) /* * This structure is used to hold the arguments that are used when loading * kernel binaries. */ typedef unsigned long kimage_entry_t; #define IND_DESTINATION 0x1 #define IND_INDIRECTION 0x2 #define IND_DONE 0x4 #define IND_SOURCE 0x8 #define KEXEC_SEGMENT_MAX 16 struct kexec_segment { void __user *buf; size_t bufsz; unsigned long mem; /* User space sees this as a (void *) ... */ size_t memsz; }; #ifdef CONFIG_COMPAT struct compat_kexec_segment { compat_uptr_t buf; compat_size_t bufsz; compat_ulong_t mem; /* User space sees this as a (void *) ... */ compat_size_t memsz; }; #endif struct kimage { kimage_entry_t head; kimage_entry_t *entry; kimage_entry_t *last_entry; unsigned long destination; unsigned long start; struct page *control_code_page; struct page *swap_page; unsigned long nr_segments; struct kexec_segment segment[KEXEC_SEGMENT_MAX]; struct list_head control_pages; struct list_head dest_pages; struct list_head unuseable_pages; /* Address of next control page to allocate for crash kernels. */ unsigned long control_page; /* Flags to indicate special processing */ unsigned int type : 1; #define KEXEC_TYPE_DEFAULT 0 #define KEXEC_TYPE_CRASH 1 unsigned int preserve_context : 1; #ifdef ARCH_HAS_KIMAGE_ARCH struct kimage_arch arch; #endif }; /* kexec interface functions */ extern void machine_kexec(struct kimage *image); extern int machine_kexec_prepare(struct kimage *image); extern void machine_kexec_cleanup(struct kimage *image); extern asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments, struct kexec_segment __user *segments, unsigned long flags); extern int kernel_kexec(void); #ifdef CONFIG_COMPAT extern asmlinkage long compat_sys_kexec_load(unsigned long entry, unsigned long nr_segments, struct compat_kexec_segment __user *segments, unsigned long flags); #endif extern struct page *kimage_alloc_control_pages(struct kimage *image, unsigned int order); extern void crash_kexec(struct pt_regs *); int kexec_should_crash(struct task_struct *); void crash_save_cpu(struct pt_regs *regs, int cpu); void crash_save_vmcoreinfo(void); void arch_crash_save_vmcoreinfo(void); void vmcoreinfo_append_str(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); unsigned long paddr_vmcoreinfo_note(void); #define VMCOREINFO_OSRELEASE(value) \ vmcoreinfo_append_str("OSRELEASE=%s\n", value) #define VMCOREINFO_PAGESIZE(value) \ vmcoreinfo_append_str("PAGESIZE=%ld\n", value) #define VMCOREINFO_SYMBOL(name) \ vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name) #define VMCOREINFO_SIZE(name) \ vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ (unsigned long)sizeof(name)) #define VMCOREINFO_STRUCT_SIZE(name) \ vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ (unsigned long)sizeof(struct name)) #define VMCOREINFO_OFFSET(name, field) \ vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \ (unsigned long)offsetof(struct name, field)) #define VMCOREINFO_LENGTH(name, value) \ vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value) #define VMCOREINFO_NUMBER(name) \ vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name) #define VMCOREINFO_CONFIG(name) \ vmcoreinfo_append_str("CONFIG_%s=y\n", #name) extern struct kimage *kexec_image; extern struct kimage *kexec_crash_image; #ifndef kexec_flush_icache_page #define kexec_flush_icache_page(page) #endif #define KEXEC_ON_CRASH 0x00000001 #define KEXEC_PRESERVE_CONTEXT 0x00000002 #define KEXEC_ARCH_MASK 0xffff0000 /* These values match the ELF architecture values. * Unless there is a good reason that should continue to be the case. */ #define KEXEC_ARCH_DEFAULT ( 0 << 16) #define KEXEC_ARCH_386 ( 3 << 16) #define KEXEC_ARCH_X86_64 (62 << 16) #define KEXEC_ARCH_PPC (20 << 16) #define KEXEC_ARCH_PPC64 (21 << 16) #define KEXEC_ARCH_IA_64 (50 << 16) #define KEXEC_ARCH_ARM (40 << 16) #define KEXEC_ARCH_S390 (22 << 16) #define KEXEC_ARCH_SH (42 << 16) #define KEXEC_ARCH_MIPS_LE (10 << 16) #define KEXEC_ARCH_MIPS ( 8 << 16) /* List of defined/legal kexec flags */ #ifndef CONFIG_KEXEC_JUMP #define KEXEC_FLAGS KEXEC_ON_CRASH #else #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT) #endif #define VMCOREINFO_BYTES (4096) #define VMCOREINFO_NOTE_NAME "VMCOREINFO" #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4) #define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \ + VMCOREINFO_NOTE_NAME_BYTES) /* Location of a reserved region to hold the crash kernel. */ extern struct resource crashk_res; typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4]; extern note_buf_t __percpu *crash_notes; extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4]; extern size_t vmcoreinfo_size; extern size_t vmcoreinfo_max_size; int __init parse_crashkernel(char *cmdline, unsigned long long system_ram, unsigned long long *crash_size, unsigned long long *crash_base); int crash_shrink_memory(unsigned long new_size); size_t crash_get_memory_size(void); void crash_free_reserved_phys_range(unsigned long begin, unsigned long end); #else /* !CONFIG_KEXEC */ struct pt_regs; struct task_struct; static inline void crash_kexec(struct pt_regs *regs) { } static inline int kexec_should_crash(struct task_struct *p) { return 0; } #endif /* CONFIG_KEXEC */ #endif /* LINUX_KEXEC_H */