[linux-2.6-block.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)
#define IND_FLAGS (IND_DESTINATION | IND_INDIRECTION | IND_DONE | IND_SOURCE)

#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)
b28c2ee8	13	#define IND_FLAGS (IND_DESTINATION \| IND_INDIRECTION \| IND_DONE \| IND_SOURCE)
cf2df639 GL	14
	15	#if !defined(__ASSEMBLY__)
	16
607ca46e	17	#include <uapi/linux/kexec.h>
29a5c67e	18
29a5c67e	19	#ifdef CONFIG_KEXEC
dc009d92 EB	20	#include <linux/list.h>
	21	#include <linux/linkage.h>
	22	#include <linux/compat.h>
9c15e852	23	#include <linux/ioport.h>
6672f76a SH	24	#include <linux/elfcore.h>
6672f76a SH	25	#include <linux/elf.h>
12db5562	26	#include <linux/module.h>
dc009d92 EB	27	#include <asm/kexec.h>
	28
	29	/* Verify architecture specific macros are defined */
	30
	31	#ifndef KEXEC_SOURCE_MEMORY_LIMIT
	32	#error KEXEC_SOURCE_MEMORY_LIMIT not defined
	33	#endif
	34
	35	#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
	36	#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
	37	#endif
	38
	39	#ifndef KEXEC_CONTROL_MEMORY_LIMIT
	40	#error KEXEC_CONTROL_MEMORY_LIMIT not defined
	41	#endif
	42
163f6876 HY	43	#ifndef KEXEC_CONTROL_PAGE_SIZE
163f6876 HY	44	#error KEXEC_CONTROL_PAGE_SIZE not defined
dc009d92 EB	45	#endif
	46
	47	#ifndef KEXEC_ARCH
	48	#error KEXEC_ARCH not defined
	49	#endif
	50
3d214fae MH	51	#ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
	52	#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
	53	#endif
	54
558df720 MH	55	#ifndef KEXEC_CRASH_MEM_ALIGN
	56	#define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
	57	#endif
	58
6672f76a SH	59	#define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
	60	#define KEXEC_CORE_NOTE_NAME "CORE"
	61	#define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
	62	#define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
	63	/*
	64	* The per-cpu notes area is a list of notes terminated by a "NULL"
	65	* note header. For kdump, the code in vmcore.c runs in the context
	66	* of the second kernel to combine them into one note.
	67	*/
cb78edfd	68	#ifndef KEXEC_NOTE_BYTES
6672f76a SH	69	#define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \
	70	KEXEC_CORE_NOTE_NAME_BYTES + \
	71	KEXEC_CORE_NOTE_DESC_BYTES )
cb78edfd	72	#endif
6672f76a	73
dc009d92 EB	74	/*
	75	* This structure is used to hold the arguments that are used when loading
	76	* kernel binaries.
	77	*/
	78
	79	typedef unsigned long kimage_entry_t;
dc009d92	80
dc009d92	81	struct kexec_segment {
815d5704 VG	82	/*
	83	* This pointer can point to user memory if kexec_load() system
	84	* call is used or will point to kernel memory if
	85	* kexec_file_load() system call is used.
	86	*
	87	* Use ->buf when expecting to deal with user memory and use ->kbuf
	88	* when expecting to deal with kernel memory.
	89	*/
	90	union {
	91	void __user *buf;
	92	void *kbuf;
	93	};
dc009d92	94	size_t bufsz;
29a5c67e	95	unsigned long mem;
dc009d92 EB	96	size_t memsz;
	97	};
	98
	99	#ifdef CONFIG_COMPAT
	100	struct compat_kexec_segment {
	101	compat_uptr_t buf;
	102	compat_size_t bufsz;
	103	compat_ulong_t mem; /* User space sees this as a (void ) ... /
	104	compat_size_t memsz;
	105	};
	106	#endif
	107
12db5562 VG	108	struct kexec_sha_region {
	109	unsigned long start;
	110	unsigned long len;
	111	};
	112
	113	struct purgatory_info {
	114	/* Pointer to elf header of read only purgatory */
	115	Elf_Ehdr *ehdr;
	116
	117	/* Pointer to purgatory sechdrs which are modifiable */
	118	Elf_Shdr *sechdrs;
	119	/*
	120	* Temporary buffer location where purgatory is loaded and relocated
	121	* This memory can be freed post image load
	122	*/
	123	void *purgatory_buf;
	124
	125	/* Address where purgatory is finally loaded and is executed from */
	126	unsigned long purgatory_load_addr;
	127	};
	128
dc009d92 EB	129	struct kimage {
	130	kimage_entry_t head;
	131	kimage_entry_t *entry;
	132	kimage_entry_t *last_entry;
	133
dc009d92 EB	134	unsigned long start;
dc009d92 EB	135	struct page *control_code_page;
3ab83521	136	struct page *swap_page;
dc009d92 EB	137
	138	unsigned long nr_segments;
	139	struct kexec_segment segment[KEXEC_SEGMENT_MAX];
	140
	141	struct list_head control_pages;
	142	struct list_head dest_pages;
7d3e2bca	143	struct list_head unusable_pages;
dc009d92 EB	144
	145	/* Address of next control page to allocate for crash kernels. */
	146	unsigned long control_page;
	147
	148	/* Flags to indicate special processing */
	149	unsigned int type : 1;
	150	#define KEXEC_TYPE_DEFAULT 0
	151	#define KEXEC_TYPE_CRASH 1
3ab83521	152	unsigned int preserve_context : 1;
cb105258 VG	153	/* If set, we are using file mode kexec syscall */
cb105258 VG	154	unsigned int file_mode:1;
92be3d6b HY	155
	156	#ifdef ARCH_HAS_KIMAGE_ARCH
	157	struct kimage_arch arch;
	158	#endif
cb105258 VG	159
	160	/* Additional fields for file based kexec syscall */
	161	void *kernel_buf;
	162	unsigned long kernel_buf_len;
	163
	164	void *initrd_buf;
	165	unsigned long initrd_buf_len;
	166
	167	char *cmdline_buf;
	168	unsigned long cmdline_buf_len;
	169
	170	/* File operations provided by image loader */
	171	struct kexec_file_ops *fops;
	172
	173	/* Image loader handling the kernel can store a pointer here */
	174	void *image_loader_data;
12db5562 VG	175
	176	/* Information for loading purgatory */
	177	struct purgatory_info purgatory_info;
dc009d92 EB	178	};
dc009d92 EB	179
cb105258 VG	180	/*
	181	* Keeps track of buffer parameters as provided by caller for requesting
	182	* memory placement of buffer.
	183	*/
	184	struct kexec_buf {
	185	struct kimage *image;
	186	char *buffer;
	187	unsigned long bufsz;
669280a1	188	unsigned long mem;
cb105258 VG	189	unsigned long memsz;
	190	unsigned long buf_align;
	191	unsigned long buf_min;
	192	unsigned long buf_max;
	193	bool top_down; /* allocate from top of memory hole */
	194	};
dc009d92	195
cb105258 VG	196	typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
	197	typedef void (kexec_load_t)(struct kimage image, char *kernel_buf,
	198	unsigned long kernel_len, char *initrd,
	199	unsigned long initrd_len, char *cmdline,
	200	unsigned long cmdline_len);
27f48d3e	201	typedef int (kexec_cleanup_t)(void *loader_data);
8e7d8381 VG	202	typedef int (kexec_verify_sig_t)(const char *kernel_buf,
8e7d8381 VG	203	unsigned long kernel_len);
cb105258 VG	204
	205	struct kexec_file_ops {
	206	kexec_probe_t *probe;
	207	kexec_load_t *load;
	208	kexec_cleanup_t *cleanup;
8e7d8381	209	kexec_verify_sig_t *verify_sig;
cb105258	210	};
dc009d92 EB	211
dc009d92 EB	212	/* kexec interface functions */
3ab83521	213	extern void machine_kexec(struct kimage *image);
dc009d92 EB	214	extern int machine_kexec_prepare(struct kimage *image);
	215	extern void machine_kexec_cleanup(struct kimage *image);
	216	extern asmlinkage long sys_kexec_load(unsigned long entry,
72414d3f MS	217	unsigned long nr_segments,
	218	struct kexec_segment __user *segments,
	219	unsigned long flags);
3ab83521	220	extern int kernel_kexec(void);
cb105258 VG	221	extern int kexec_add_buffer(struct kimage image, char buffer,
	222	unsigned long bufsz, unsigned long memsz,
	223	unsigned long buf_align, unsigned long buf_min,
	224	unsigned long buf_max, bool top_down,
	225	unsigned long *load_addr);
72414d3f MS	226	extern struct page kimage_alloc_control_pages(struct kimage image,
72414d3f MS	227	unsigned int order);
12db5562 VG	228	extern int kexec_load_purgatory(struct kimage *image, unsigned long min,
	229	unsigned long max, int top_down,
	230	unsigned long *load_addr);
	231	extern int kexec_purgatory_get_set_symbol(struct kimage *image,
	232	const char name, void buf,
	233	unsigned int size, bool get_value);
	234	extern void kexec_purgatory_get_symbol_addr(struct kimage image,
	235	const char *name);
6e274d14 AN	236	extern void crash_kexec(struct pt_regs *);
6e274d14 AN	237	int kexec_should_crash(struct task_struct *);
85916f81	238	void crash_save_cpu(struct pt_regs *regs, int cpu);
fd59d231	239	void crash_save_vmcoreinfo(void);
558df720 MH	240	void crash_map_reserved_pages(void);
558df720 MH	241	void crash_unmap_reserved_pages(void);
fd59d231	242	void arch_crash_save_vmcoreinfo(void);
b9075fa9 JP	243	__printf(1, 2)
b9075fa9 JP	244	void vmcoreinfo_append_str(const char *fmt, ...);
fd59d231 KO	245	unsigned long paddr_vmcoreinfo_note(void);
fd59d231 KO	246
c6e2bee2 BW	247	#define VMCOREINFO_OSRELEASE(value) \
c6e2bee2 BW	248	vmcoreinfo_append_str("OSRELEASE=%s\n", value)
bba1f603 KO	249	#define VMCOREINFO_PAGESIZE(value) \
bba1f603 KO	250	vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
bcbba6c1	251	#define VMCOREINFO_SYMBOL(name) \
fd59d231	252	vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
bcbba6c1	253	#define VMCOREINFO_SIZE(name) \
6cfa062f KO	254	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
6cfa062f KO	255	(unsigned long)sizeof(name))
c76f860c KO	256	#define VMCOREINFO_STRUCT_SIZE(name) \
	257	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
	258	(unsigned long)sizeof(struct name))
bcbba6c1	259	#define VMCOREINFO_OFFSET(name, field) \
d768281e	260	vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
1e4f2955	261	(unsigned long)offsetof(struct name, field))
bcbba6c1	262	#define VMCOREINFO_LENGTH(name, value) \
d768281e	263	vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
bcbba6c1	264	#define VMCOREINFO_NUMBER(name) \
6cfa062f	265	vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
bcbba6c1	266	#define VMCOREINFO_CONFIG(name) \
fd59d231 KO	267	vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
fd59d231 KO	268
dc009d92	269	extern struct kimage *kexec_image;
c330dda9	270	extern struct kimage *kexec_crash_image;
7984754b	271	extern int kexec_load_disabled;
dc009d92	272
a7956113 ZN	273	#ifndef kexec_flush_icache_page
	274	#define kexec_flush_icache_page(page)
	275	#endif
	276
3ab83521 HY	277	/* List of defined/legal kexec flags */
	278	#ifndef CONFIG_KEXEC_JUMP
	279	#define KEXEC_FLAGS KEXEC_ON_CRASH
	280	#else
	281	#define KEXEC_FLAGS (KEXEC_ON_CRASH \| KEXEC_PRESERVE_CONTEXT)
	282	#endif
dc009d92	283
cb105258 VG	284	/* List of defined/legal kexec file flags */
	285	#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD \| KEXEC_FILE_ON_CRASH \| \
	286	KEXEC_FILE_NO_INITRAMFS)
	287
fd59d231 KO	288	#define VMCOREINFO_BYTES (4096)
	289	#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
	290	#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
	291	#define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
	292	+ VMCOREINFO_NOTE_NAME_BYTES)
	293
dc009d92 EB	294	/* Location of a reserved region to hold the crash kernel.
	295	*/
	296	extern struct resource crashk_res;
0212f915	297	extern struct resource crashk_low_res;
6672f76a	298	typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
43cf38eb	299	extern note_buf_t __percpu *crash_notes;
fd59d231	300	extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
d768281e KO	301	extern size_t vmcoreinfo_size;
d768281e KO	302	extern size_t vmcoreinfo_max_size;
dc009d92	303
4fc9bbf9 KA	304	/* flag to track if kexec reboot is in progress */
	305	extern bool kexec_in_progress;
	306
cba63c30 BW	307	int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
cba63c30 BW	308	unsigned long long crash_size, unsigned long long crash_base);
55a20ee7 YL	309	int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
55a20ee7 YL	310	unsigned long long crash_size, unsigned long long crash_base);
0212f915 YL	311	int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
0212f915 YL	312	unsigned long long crash_size, unsigned long long crash_base);
06a7f711 AW	313	int crash_shrink_memory(unsigned long new_size);
06a7f711 AW	314	size_t crash_get_memory_size(void);
c0bb9e45	315	void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
a7956113	316
dc009d92	317	#else /* !CONFIG_KEXEC */
6e274d14 AN	318	struct pt_regs;
	319	struct task_struct;
	320	static inline void crash_kexec(struct pt_regs *regs) { }
	321	static inline int kexec_should_crash(struct task_struct *p) { return 0; }
dc009d92	322	#endif /* CONFIG_KEXEC */
cf2df639 GL	323
	324	#endif /* !defined(__ASSEBMLY__) */
	325
dc009d92	326	#endif /* LINUX_KEXEC_H */