[mirror_ubuntu-bionic-kernel.git] / include / linux / kexec.h

#ifndef LINUX_KEXEC_H
#define LINUX_KEXEC_H

#define IND_DESTINATION_BIT 0
#define IND_INDIRECTION_BIT 1
#define IND_DONE_BIT        2
#define IND_SOURCE_BIT      3

#define IND_DESTINATION  (1 << IND_DESTINATION_BIT)
#define IND_INDIRECTION  (1 << IND_INDIRECTION_BIT)
#define IND_DONE         (1 << IND_DONE_BIT)
#define IND_SOURCE       (1 << IND_SOURCE_BIT)

#if !defined(__ASSEMBLY__)

#include <uapi/linux/kexec.h>

#ifdef CONFIG_KEXEC
#include <linux/list.h>
#include <linux/linkage.h>
#include <linux/compat.h>
#include <linux/ioport.h>
#include <linux/elfcore.h>
#include <linux/elf.h>
#include <linux/module.h>
#include <asm/kexec.h>

/* 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

#ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
#endif

#ifndef KEXEC_CRASH_MEM_ALIGN
#define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
#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.
 */
#ifndef KEXEC_NOTE_BYTES
#define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) +		\
			    KEXEC_CORE_NOTE_NAME_BYTES +		\
			    KEXEC_CORE_NOTE_DESC_BYTES )
#endif

/*
 * This structure is used to hold the arguments that are used when loading
 * kernel binaries.
 */

typedef unsigned long kimage_entry_t;

struct kexec_segment {
	/*
	 * This pointer can point to user memory if kexec_load() system
	 * call is used or will point to kernel memory if
	 * kexec_file_load() system call is used.
	 *
	 * Use ->buf when expecting to deal with user memory and use ->kbuf
	 * when expecting to deal with kernel memory.
	 */
	union {
		void __user *buf;
		void *kbuf;
	};
	size_t bufsz;
	unsigned long mem;
	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 kexec_sha_region {
	unsigned long start;
	unsigned long len;
};

struct purgatory_info {
	/* Pointer to elf header of read only purgatory */
	Elf_Ehdr *ehdr;

	/* Pointer to purgatory sechdrs which are modifiable */
	Elf_Shdr *sechdrs;
	/*
	 * Temporary buffer location where purgatory is loaded and relocated
	 * This memory can be freed post image load
	 */
	void *purgatory_buf;

	/* Address where purgatory is finally loaded and is executed from */
	unsigned long purgatory_load_addr;
};

struct kimage {
	kimage_entry_t head;
	kimage_entry_t *entry;
	kimage_entry_t *last_entry;

	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 unusable_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;
	/* If set, we are using file mode kexec syscall */
	unsigned int file_mode:1;

#ifdef ARCH_HAS_KIMAGE_ARCH
	struct kimage_arch arch;
#endif

	/* Additional fields for file based kexec syscall */
	void *kernel_buf;
	unsigned long kernel_buf_len;

	void *initrd_buf;
	unsigned long initrd_buf_len;

	char *cmdline_buf;
	unsigned long cmdline_buf_len;

	/* File operations provided by image loader */
	struct kexec_file_ops *fops;

	/* Image loader handling the kernel can store a pointer here */
	void *image_loader_data;

	/* Information for loading purgatory */
	struct purgatory_info purgatory_info;
};

/*
 * Keeps track of buffer parameters as provided by caller for requesting
 * memory placement of buffer.
 */
struct kexec_buf {
	struct kimage *image;
	char *buffer;
	unsigned long bufsz;
	unsigned long mem;
	unsigned long memsz;
	unsigned long buf_align;
	unsigned long buf_min;
	unsigned long buf_max;
	bool top_down;		/* allocate from top of memory hole */
};

typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf,
			     unsigned long kernel_len, char *initrd,
			     unsigned long initrd_len, char *cmdline,
			     unsigned long cmdline_len);
typedef int (kexec_cleanup_t)(void *loader_data);
typedef int (kexec_verify_sig_t)(const char *kernel_buf,
				 unsigned long kernel_len);

struct kexec_file_ops {
	kexec_probe_t *probe;
	kexec_load_t *load;
	kexec_cleanup_t *cleanup;
	kexec_verify_sig_t *verify_sig;
};

/* 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);
extern int kexec_add_buffer(struct kimage *image, char *buffer,
			    unsigned long bufsz, unsigned long memsz,
			    unsigned long buf_align, unsigned long buf_min,
			    unsigned long buf_max, bool top_down,
			    unsigned long *load_addr);
extern struct page *kimage_alloc_control_pages(struct kimage *image,
						unsigned int order);
extern int kexec_load_purgatory(struct kimage *image, unsigned long min,
				unsigned long max, int top_down,
				unsigned long *load_addr);
extern int kexec_purgatory_get_set_symbol(struct kimage *image,
					  const char *name, void *buf,
					  unsigned int size, bool get_value);
extern void *kexec_purgatory_get_symbol_addr(struct kimage *image,
					     const char *name);
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 crash_map_reserved_pages(void);
void crash_unmap_reserved_pages(void);
void arch_crash_save_vmcoreinfo(void);
__printf(1, 2)
void vmcoreinfo_append_str(const char *fmt, ...);
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;
extern int kexec_load_disabled;

#ifndef kexec_flush_icache_page
#define kexec_flush_icache_page(page)
#endif

/* 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

/* List of defined/legal kexec file flags */
#define KEXEC_FILE_FLAGS	(KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
				 KEXEC_FILE_NO_INITRAMFS)

#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;
extern struct resource crashk_low_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;

/* flag to track if kexec reboot is in progress */
extern bool kexec_in_progress;

int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
		unsigned long long *crash_size, unsigned long long *crash_base);
int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
		unsigned long long *crash_size, unsigned long long *crash_base);
int parse_crashkernel_low(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 /* !defined(__ASSEBMLY__) */

#endif /* LINUX_KEXEC_H */
Commit	Line	Data
dc009d92 EB	1	#ifndef LINUX_KEXEC_H
	2	#define LINUX_KEXEC_H
	3
cf2df639 GL	4	#define IND_DESTINATION_BIT 0
	5	#define IND_INDIRECTION_BIT 1
	6	#define IND_DONE_BIT 2
	7	#define IND_SOURCE_BIT 3
	8
	9	#define IND_DESTINATION (1 << IND_DESTINATION_BIT)
	10	#define IND_INDIRECTION (1 << IND_INDIRECTION_BIT)
	11	#define IND_DONE (1 << IND_DONE_BIT)
	12	#define IND_SOURCE (1 << IND_SOURCE_BIT)
	13
	14	#if !defined(__ASSEMBLY__)
	15
607ca46e	16	#include <uapi/linux/kexec.h>
29a5c67e	17
29a5c67e	18	#ifdef CONFIG_KEXEC
dc009d92 EB	19	#include <linux/list.h>
	20	#include <linux/linkage.h>
	21	#include <linux/compat.h>
9c15e852	22	#include <linux/ioport.h>
6672f76a SH	23	#include <linux/elfcore.h>
6672f76a SH	24	#include <linux/elf.h>
12db5562	25	#include <linux/module.h>
dc009d92 EB	26	#include <asm/kexec.h>
	27
	28	/* Verify architecture specific macros are defined */
	29
	30	#ifndef KEXEC_SOURCE_MEMORY_LIMIT
	31	#error KEXEC_SOURCE_MEMORY_LIMIT not defined
	32	#endif
	33
	34	#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
	35	#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
	36	#endif
	37
	38	#ifndef KEXEC_CONTROL_MEMORY_LIMIT
	39	#error KEXEC_CONTROL_MEMORY_LIMIT not defined
	40	#endif
	41
163f6876 HY	42	#ifndef KEXEC_CONTROL_PAGE_SIZE
163f6876 HY	43	#error KEXEC_CONTROL_PAGE_SIZE not defined
dc009d92 EB	44	#endif
	45
	46	#ifndef KEXEC_ARCH
	47	#error KEXEC_ARCH not defined
	48	#endif
	49
3d214fae MH	50	#ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
	51	#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
	52	#endif
	53
558df720 MH	54	#ifndef KEXEC_CRASH_MEM_ALIGN
	55	#define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
	56	#endif
	57
6672f76a SH	58	#define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
	59	#define KEXEC_CORE_NOTE_NAME "CORE"
	60	#define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
	61	#define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
	62	/*
	63	* The per-cpu notes area is a list of notes terminated by a "NULL"
	64	* note header. For kdump, the code in vmcore.c runs in the context
	65	* of the second kernel to combine them into one note.
	66	*/
cb78edfd	67	#ifndef KEXEC_NOTE_BYTES
6672f76a SH	68	#define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \
	69	KEXEC_CORE_NOTE_NAME_BYTES + \
	70	KEXEC_CORE_NOTE_DESC_BYTES )
cb78edfd	71	#endif
6672f76a	72
dc009d92 EB	73	/*
	74	* This structure is used to hold the arguments that are used when loading
	75	* kernel binaries.
	76	*/
	77
	78	typedef unsigned long kimage_entry_t;
dc009d92	79
dc009d92	80	struct kexec_segment {
815d5704 VG	81	/*
	82	* This pointer can point to user memory if kexec_load() system
	83	* call is used or will point to kernel memory if
	84	* kexec_file_load() system call is used.
	85	*
	86	* Use ->buf when expecting to deal with user memory and use ->kbuf
	87	* when expecting to deal with kernel memory.
	88	*/
	89	union {
	90	void __user *buf;
	91	void *kbuf;
	92	};
dc009d92	93	size_t bufsz;
29a5c67e	94	unsigned long mem;
dc009d92 EB	95	size_t memsz;
	96	};
	97
	98	#ifdef CONFIG_COMPAT
	99	struct compat_kexec_segment {
	100	compat_uptr_t buf;
	101	compat_size_t bufsz;
	102	compat_ulong_t mem; /* User space sees this as a (void ) ... /
	103	compat_size_t memsz;
	104	};
	105	#endif
	106
12db5562 VG	107	struct kexec_sha_region {
	108	unsigned long start;
	109	unsigned long len;
	110	};
	111
	112	struct purgatory_info {
	113	/* Pointer to elf header of read only purgatory */
	114	Elf_Ehdr *ehdr;
	115
	116	/* Pointer to purgatory sechdrs which are modifiable */
	117	Elf_Shdr *sechdrs;
	118	/*
	119	* Temporary buffer location where purgatory is loaded and relocated
	120	* This memory can be freed post image load
	121	*/
	122	void *purgatory_buf;
	123
	124	/* Address where purgatory is finally loaded and is executed from */
	125	unsigned long purgatory_load_addr;
	126	};
	127
dc009d92 EB	128	struct kimage {
	129	kimage_entry_t head;
	130	kimage_entry_t *entry;
	131	kimage_entry_t *last_entry;
	132
dc009d92 EB	133	unsigned long start;
dc009d92 EB	134	struct page *control_code_page;
3ab83521	135	struct page *swap_page;
dc009d92 EB	136
	137	unsigned long nr_segments;
	138	struct kexec_segment segment[KEXEC_SEGMENT_MAX];
	139
	140	struct list_head control_pages;
	141	struct list_head dest_pages;
7d3e2bca	142	struct list_head unusable_pages;
dc009d92 EB	143
	144	/* Address of next control page to allocate for crash kernels. */
	145	unsigned long control_page;
	146
	147	/* Flags to indicate special processing */
	148	unsigned int type : 1;
	149	#define KEXEC_TYPE_DEFAULT 0
	150	#define KEXEC_TYPE_CRASH 1
3ab83521	151	unsigned int preserve_context : 1;
cb105258 VG	152	/* If set, we are using file mode kexec syscall */
cb105258 VG	153	unsigned int file_mode:1;
92be3d6b HY	154
	155	#ifdef ARCH_HAS_KIMAGE_ARCH
	156	struct kimage_arch arch;
	157	#endif
cb105258 VG	158
	159	/* Additional fields for file based kexec syscall */
	160	void *kernel_buf;
	161	unsigned long kernel_buf_len;
	162
	163	void *initrd_buf;
	164	unsigned long initrd_buf_len;
	165
	166	char *cmdline_buf;
	167	unsigned long cmdline_buf_len;
	168
	169	/* File operations provided by image loader */
	170	struct kexec_file_ops *fops;
	171
	172	/* Image loader handling the kernel can store a pointer here */
	173	void *image_loader_data;
12db5562 VG	174
	175	/* Information for loading purgatory */
	176	struct purgatory_info purgatory_info;
dc009d92 EB	177	};
dc009d92 EB	178
cb105258 VG	179	/*
	180	* Keeps track of buffer parameters as provided by caller for requesting
	181	* memory placement of buffer.
	182	*/
	183	struct kexec_buf {
	184	struct kimage *image;
	185	char *buffer;
	186	unsigned long bufsz;
669280a1	187	unsigned long mem;
cb105258 VG	188	unsigned long memsz;
	189	unsigned long buf_align;
	190	unsigned long buf_min;
	191	unsigned long buf_max;
	192	bool top_down; /* allocate from top of memory hole */
	193	};
dc009d92	194
cb105258 VG	195	typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
	196	typedef void (kexec_load_t)(struct kimage image, char *kernel_buf,
	197	unsigned long kernel_len, char *initrd,
	198	unsigned long initrd_len, char *cmdline,
	199	unsigned long cmdline_len);
27f48d3e	200	typedef int (kexec_cleanup_t)(void *loader_data);
8e7d8381 VG	201	typedef int (kexec_verify_sig_t)(const char *kernel_buf,
8e7d8381 VG	202	unsigned long kernel_len);
cb105258 VG	203
	204	struct kexec_file_ops {
	205	kexec_probe_t *probe;
	206	kexec_load_t *load;
	207	kexec_cleanup_t *cleanup;
8e7d8381	208	kexec_verify_sig_t *verify_sig;
cb105258	209	};
dc009d92 EB	210
dc009d92 EB	211	/* kexec interface functions */
3ab83521	212	extern void machine_kexec(struct kimage *image);
dc009d92 EB	213	extern int machine_kexec_prepare(struct kimage *image);
	214	extern void machine_kexec_cleanup(struct kimage *image);
	215	extern asmlinkage long sys_kexec_load(unsigned long entry,
72414d3f MS	216	unsigned long nr_segments,
	217	struct kexec_segment __user *segments,
	218	unsigned long flags);
3ab83521	219	extern int kernel_kexec(void);
cb105258 VG	220	extern int kexec_add_buffer(struct kimage image, char buffer,
	221	unsigned long bufsz, unsigned long memsz,
	222	unsigned long buf_align, unsigned long buf_min,
	223	unsigned long buf_max, bool top_down,
	224	unsigned long *load_addr);
72414d3f MS	225	extern struct page kimage_alloc_control_pages(struct kimage image,
72414d3f MS	226	unsigned int order);
12db5562 VG	227	extern int kexec_load_purgatory(struct kimage *image, unsigned long min,
	228	unsigned long max, int top_down,
	229	unsigned long *load_addr);
	230	extern int kexec_purgatory_get_set_symbol(struct kimage *image,
	231	const char name, void buf,
	232	unsigned int size, bool get_value);
	233	extern void kexec_purgatory_get_symbol_addr(struct kimage image,
	234	const char *name);
6e274d14 AN	235	extern void crash_kexec(struct pt_regs *);
6e274d14 AN	236	int kexec_should_crash(struct task_struct *);
85916f81	237	void crash_save_cpu(struct pt_regs *regs, int cpu);
fd59d231	238	void crash_save_vmcoreinfo(void);
558df720 MH	239	void crash_map_reserved_pages(void);
558df720 MH	240	void crash_unmap_reserved_pages(void);
fd59d231	241	void arch_crash_save_vmcoreinfo(void);
b9075fa9 JP	242	__printf(1, 2)
b9075fa9 JP	243	void vmcoreinfo_append_str(const char *fmt, ...);
fd59d231 KO	244	unsigned long paddr_vmcoreinfo_note(void);
fd59d231 KO	245
c6e2bee2 BW	246	#define VMCOREINFO_OSRELEASE(value) \
c6e2bee2 BW	247	vmcoreinfo_append_str("OSRELEASE=%s\n", value)
bba1f603 KO	248	#define VMCOREINFO_PAGESIZE(value) \
bba1f603 KO	249	vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
bcbba6c1	250	#define VMCOREINFO_SYMBOL(name) \
fd59d231	251	vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
bcbba6c1	252	#define VMCOREINFO_SIZE(name) \
6cfa062f KO	253	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
6cfa062f KO	254	(unsigned long)sizeof(name))
c76f860c KO	255	#define VMCOREINFO_STRUCT_SIZE(name) \
	256	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
	257	(unsigned long)sizeof(struct name))
bcbba6c1	258	#define VMCOREINFO_OFFSET(name, field) \
d768281e	259	vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
1e4f2955	260	(unsigned long)offsetof(struct name, field))
bcbba6c1	261	#define VMCOREINFO_LENGTH(name, value) \
d768281e	262	vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
bcbba6c1	263	#define VMCOREINFO_NUMBER(name) \
6cfa062f	264	vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
bcbba6c1	265	#define VMCOREINFO_CONFIG(name) \
fd59d231 KO	266	vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
fd59d231 KO	267
dc009d92	268	extern struct kimage *kexec_image;
c330dda9	269	extern struct kimage *kexec_crash_image;
7984754b	270	extern int kexec_load_disabled;
dc009d92	271
a7956113 ZN	272	#ifndef kexec_flush_icache_page
	273	#define kexec_flush_icache_page(page)
	274	#endif
	275
3ab83521 HY	276	/* List of defined/legal kexec flags */
	277	#ifndef CONFIG_KEXEC_JUMP
	278	#define KEXEC_FLAGS KEXEC_ON_CRASH
	279	#else
	280	#define KEXEC_FLAGS (KEXEC_ON_CRASH \| KEXEC_PRESERVE_CONTEXT)
	281	#endif
dc009d92	282
cb105258 VG	283	/* List of defined/legal kexec file flags */
	284	#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD \| KEXEC_FILE_ON_CRASH \| \
	285	KEXEC_FILE_NO_INITRAMFS)
	286
fd59d231 KO	287	#define VMCOREINFO_BYTES (4096)
	288	#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
	289	#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
	290	#define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
	291	+ VMCOREINFO_NOTE_NAME_BYTES)
	292
dc009d92 EB	293	/* Location of a reserved region to hold the crash kernel.
	294	*/
	295	extern struct resource crashk_res;
0212f915	296	extern struct resource crashk_low_res;
6672f76a	297	typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
43cf38eb	298	extern note_buf_t __percpu *crash_notes;
fd59d231	299	extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
d768281e KO	300	extern size_t vmcoreinfo_size;
d768281e KO	301	extern size_t vmcoreinfo_max_size;
dc009d92	302
4fc9bbf9 KA	303	/* flag to track if kexec reboot is in progress */
	304	extern bool kexec_in_progress;
	305
cba63c30 BW	306	int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
cba63c30 BW	307	unsigned long long crash_size, unsigned long long crash_base);
55a20ee7 YL	308	int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
55a20ee7 YL	309	unsigned long long crash_size, unsigned long long crash_base);
0212f915 YL	310	int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
0212f915 YL	311	unsigned long long crash_size, unsigned long long crash_base);
06a7f711 AW	312	int crash_shrink_memory(unsigned long new_size);
06a7f711 AW	313	size_t crash_get_memory_size(void);
c0bb9e45	314	void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
a7956113	315
dc009d92	316	#else /* !CONFIG_KEXEC */
6e274d14 AN	317	struct pt_regs;
	318	struct task_struct;
	319	static inline void crash_kexec(struct pt_regs *regs) { }
	320	static inline int kexec_should_crash(struct task_struct *p) { return 0; }
dc009d92	321	#endif /* CONFIG_KEXEC */
cf2df639 GL	322
	323	#endif /* !defined(__ASSEBMLY__) */
	324
dc009d92	325	#endif /* LINUX_KEXEC_H */