[deliverable/linux.git] / include / linux / kexec.h

#ifndef LINUX_KEXEC_H
#define LINUX_KEXEC_H

#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;
#define IND_DESTINATION  0x1
#define IND_INDIRECTION  0x2
#define IND_DONE         0x4
#define IND_SOURCE       0x8

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 /* LINUX_KEXEC_H */
Commit	Line	Data
dc009d92 EB	1	#ifndef LINUX_KEXEC_H
	2	#define LINUX_KEXEC_H
	3
607ca46e	4	#include <uapi/linux/kexec.h>
29a5c67e	5
29a5c67e	6	#ifdef CONFIG_KEXEC
dc009d92 EB	7	#include <linux/list.h>
	8	#include <linux/linkage.h>
	9	#include <linux/compat.h>
9c15e852	10	#include <linux/ioport.h>
6672f76a SH	11	#include <linux/elfcore.h>
6672f76a SH	12	#include <linux/elf.h>
12db5562	13	#include <linux/module.h>
dc009d92 EB	14	#include <asm/kexec.h>
	15
	16	/* Verify architecture specific macros are defined */
	17
	18	#ifndef KEXEC_SOURCE_MEMORY_LIMIT
	19	#error KEXEC_SOURCE_MEMORY_LIMIT not defined
	20	#endif
	21
	22	#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
	23	#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
	24	#endif
	25
	26	#ifndef KEXEC_CONTROL_MEMORY_LIMIT
	27	#error KEXEC_CONTROL_MEMORY_LIMIT not defined
	28	#endif
	29
163f6876 HY	30	#ifndef KEXEC_CONTROL_PAGE_SIZE
163f6876 HY	31	#error KEXEC_CONTROL_PAGE_SIZE not defined
dc009d92 EB	32	#endif
	33
	34	#ifndef KEXEC_ARCH
	35	#error KEXEC_ARCH not defined
	36	#endif
	37
3d214fae MH	38	#ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
	39	#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
	40	#endif
	41
558df720 MH	42	#ifndef KEXEC_CRASH_MEM_ALIGN
	43	#define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
	44	#endif
	45
6672f76a SH	46	#define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
	47	#define KEXEC_CORE_NOTE_NAME "CORE"
	48	#define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
	49	#define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
	50	/*
	51	* The per-cpu notes area is a list of notes terminated by a "NULL"
	52	* note header. For kdump, the code in vmcore.c runs in the context
	53	* of the second kernel to combine them into one note.
	54	*/
cb78edfd	55	#ifndef KEXEC_NOTE_BYTES
6672f76a SH	56	#define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \
	57	KEXEC_CORE_NOTE_NAME_BYTES + \
	58	KEXEC_CORE_NOTE_DESC_BYTES )
cb78edfd	59	#endif
6672f76a	60
dc009d92 EB	61	/*
	62	* This structure is used to hold the arguments that are used when loading
	63	* kernel binaries.
	64	*/
	65
	66	typedef unsigned long kimage_entry_t;
	67	#define IND_DESTINATION 0x1
	68	#define IND_INDIRECTION 0x2
	69	#define IND_DONE 0x4
	70	#define IND_SOURCE 0x8
	71
dc009d92	72	struct kexec_segment {
815d5704 VG	73	/*
	74	* This pointer can point to user memory if kexec_load() system
	75	* call is used or will point to kernel memory if
	76	* kexec_file_load() system call is used.
	77	*
	78	* Use ->buf when expecting to deal with user memory and use ->kbuf
	79	* when expecting to deal with kernel memory.
	80	*/
	81	union {
	82	void __user *buf;
	83	void *kbuf;
	84	};
dc009d92	85	size_t bufsz;
29a5c67e	86	unsigned long mem;
dc009d92 EB	87	size_t memsz;
	88	};
	89
	90	#ifdef CONFIG_COMPAT
	91	struct compat_kexec_segment {
	92	compat_uptr_t buf;
	93	compat_size_t bufsz;
	94	compat_ulong_t mem; /* User space sees this as a (void ) ... /
	95	compat_size_t memsz;
	96	};
	97	#endif
	98
12db5562 VG	99	struct kexec_sha_region {
	100	unsigned long start;
	101	unsigned long len;
	102	};
	103
	104	struct purgatory_info {
	105	/* Pointer to elf header of read only purgatory */
	106	Elf_Ehdr *ehdr;
	107
	108	/* Pointer to purgatory sechdrs which are modifiable */
	109	Elf_Shdr *sechdrs;
	110	/*
	111	* Temporary buffer location where purgatory is loaded and relocated
	112	* This memory can be freed post image load
	113	*/
	114	void *purgatory_buf;
	115
	116	/* Address where purgatory is finally loaded and is executed from */
	117	unsigned long purgatory_load_addr;
	118	};
	119
dc009d92 EB	120	struct kimage {
	121	kimage_entry_t head;
	122	kimage_entry_t *entry;
	123	kimage_entry_t *last_entry;
	124
dc009d92 EB	125	unsigned long start;
dc009d92 EB	126	struct page *control_code_page;
3ab83521	127	struct page *swap_page;
dc009d92 EB	128
	129	unsigned long nr_segments;
	130	struct kexec_segment segment[KEXEC_SEGMENT_MAX];
	131
	132	struct list_head control_pages;
	133	struct list_head dest_pages;
7d3e2bca	134	struct list_head unusable_pages;
dc009d92 EB	135
	136	/* Address of next control page to allocate for crash kernels. */
	137	unsigned long control_page;
	138
	139	/* Flags to indicate special processing */
	140	unsigned int type : 1;
	141	#define KEXEC_TYPE_DEFAULT 0
	142	#define KEXEC_TYPE_CRASH 1
3ab83521	143	unsigned int preserve_context : 1;
cb105258 VG	144	/* If set, we are using file mode kexec syscall */
cb105258 VG	145	unsigned int file_mode:1;
92be3d6b HY	146
	147	#ifdef ARCH_HAS_KIMAGE_ARCH
	148	struct kimage_arch arch;
	149	#endif
cb105258 VG	150
	151	/* Additional fields for file based kexec syscall */
	152	void *kernel_buf;
	153	unsigned long kernel_buf_len;
	154
	155	void *initrd_buf;
	156	unsigned long initrd_buf_len;
	157
	158	char *cmdline_buf;
	159	unsigned long cmdline_buf_len;
	160
	161	/* File operations provided by image loader */
	162	struct kexec_file_ops *fops;
	163
	164	/* Image loader handling the kernel can store a pointer here */
	165	void *image_loader_data;
12db5562 VG	166
	167	/* Information for loading purgatory */
	168	struct purgatory_info purgatory_info;
dc009d92 EB	169	};
dc009d92 EB	170
cb105258 VG	171	/*
	172	* Keeps track of buffer parameters as provided by caller for requesting
	173	* memory placement of buffer.
	174	*/
	175	struct kexec_buf {
	176	struct kimage *image;
	177	char *buffer;
	178	unsigned long bufsz;
669280a1	179	unsigned long mem;
cb105258 VG	180	unsigned long memsz;
	181	unsigned long buf_align;
	182	unsigned long buf_min;
	183	unsigned long buf_max;
	184	bool top_down; /* allocate from top of memory hole */
	185	};
dc009d92	186
cb105258 VG	187	typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
	188	typedef void (kexec_load_t)(struct kimage image, char *kernel_buf,
	189	unsigned long kernel_len, char *initrd,
	190	unsigned long initrd_len, char *cmdline,
	191	unsigned long cmdline_len);
27f48d3e	192	typedef int (kexec_cleanup_t)(void *loader_data);
8e7d8381 VG	193	typedef int (kexec_verify_sig_t)(const char *kernel_buf,
8e7d8381 VG	194	unsigned long kernel_len);
cb105258 VG	195
	196	struct kexec_file_ops {
	197	kexec_probe_t *probe;
	198	kexec_load_t *load;
	199	kexec_cleanup_t *cleanup;
8e7d8381	200	kexec_verify_sig_t *verify_sig;
cb105258	201	};
dc009d92 EB	202
dc009d92 EB	203	/* kexec interface functions */
3ab83521	204	extern void machine_kexec(struct kimage *image);
dc009d92 EB	205	extern int machine_kexec_prepare(struct kimage *image);
	206	extern void machine_kexec_cleanup(struct kimage *image);
	207	extern asmlinkage long sys_kexec_load(unsigned long entry,
72414d3f MS	208	unsigned long nr_segments,
	209	struct kexec_segment __user *segments,
	210	unsigned long flags);
3ab83521	211	extern int kernel_kexec(void);
cb105258 VG	212	extern int kexec_add_buffer(struct kimage image, char buffer,
	213	unsigned long bufsz, unsigned long memsz,
	214	unsigned long buf_align, unsigned long buf_min,
	215	unsigned long buf_max, bool top_down,
	216	unsigned long *load_addr);
72414d3f MS	217	extern struct page kimage_alloc_control_pages(struct kimage image,
72414d3f MS	218	unsigned int order);
12db5562 VG	219	extern int kexec_load_purgatory(struct kimage *image, unsigned long min,
	220	unsigned long max, int top_down,
	221	unsigned long *load_addr);
	222	extern int kexec_purgatory_get_set_symbol(struct kimage *image,
	223	const char name, void buf,
	224	unsigned int size, bool get_value);
	225	extern void kexec_purgatory_get_symbol_addr(struct kimage image,
	226	const char *name);
6e274d14 AN	227	extern void crash_kexec(struct pt_regs *);
6e274d14 AN	228	int kexec_should_crash(struct task_struct *);
85916f81	229	void crash_save_cpu(struct pt_regs *regs, int cpu);
fd59d231	230	void crash_save_vmcoreinfo(void);
558df720 MH	231	void crash_map_reserved_pages(void);
558df720 MH	232	void crash_unmap_reserved_pages(void);
fd59d231	233	void arch_crash_save_vmcoreinfo(void);
b9075fa9 JP	234	__printf(1, 2)
b9075fa9 JP	235	void vmcoreinfo_append_str(const char *fmt, ...);
fd59d231 KO	236	unsigned long paddr_vmcoreinfo_note(void);
fd59d231 KO	237
c6e2bee2 BW	238	#define VMCOREINFO_OSRELEASE(value) \
c6e2bee2 BW	239	vmcoreinfo_append_str("OSRELEASE=%s\n", value)
bba1f603 KO	240	#define VMCOREINFO_PAGESIZE(value) \
bba1f603 KO	241	vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
bcbba6c1	242	#define VMCOREINFO_SYMBOL(name) \
fd59d231	243	vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
bcbba6c1	244	#define VMCOREINFO_SIZE(name) \
6cfa062f KO	245	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
6cfa062f KO	246	(unsigned long)sizeof(name))
c76f860c KO	247	#define VMCOREINFO_STRUCT_SIZE(name) \
	248	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
	249	(unsigned long)sizeof(struct name))
bcbba6c1	250	#define VMCOREINFO_OFFSET(name, field) \
d768281e	251	vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
1e4f2955	252	(unsigned long)offsetof(struct name, field))
bcbba6c1	253	#define VMCOREINFO_LENGTH(name, value) \
d768281e	254	vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
bcbba6c1	255	#define VMCOREINFO_NUMBER(name) \
6cfa062f	256	vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
bcbba6c1	257	#define VMCOREINFO_CONFIG(name) \
fd59d231 KO	258	vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
fd59d231 KO	259
dc009d92	260	extern struct kimage *kexec_image;
c330dda9	261	extern struct kimage *kexec_crash_image;
7984754b	262	extern int kexec_load_disabled;
dc009d92	263
a7956113 ZN	264	#ifndef kexec_flush_icache_page
	265	#define kexec_flush_icache_page(page)
	266	#endif
	267
3ab83521 HY	268	/* List of defined/legal kexec flags */
	269	#ifndef CONFIG_KEXEC_JUMP
	270	#define KEXEC_FLAGS KEXEC_ON_CRASH
	271	#else
	272	#define KEXEC_FLAGS (KEXEC_ON_CRASH \| KEXEC_PRESERVE_CONTEXT)
	273	#endif
dc009d92	274
cb105258 VG	275	/* List of defined/legal kexec file flags */
	276	#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD \| KEXEC_FILE_ON_CRASH \| \
	277	KEXEC_FILE_NO_INITRAMFS)
	278
fd59d231 KO	279	#define VMCOREINFO_BYTES (4096)
	280	#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
	281	#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
	282	#define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
	283	+ VMCOREINFO_NOTE_NAME_BYTES)
	284
dc009d92 EB	285	/* Location of a reserved region to hold the crash kernel.
	286	*/
	287	extern struct resource crashk_res;
0212f915	288	extern struct resource crashk_low_res;
6672f76a	289	typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
43cf38eb	290	extern note_buf_t __percpu *crash_notes;
fd59d231	291	extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
d768281e KO	292	extern size_t vmcoreinfo_size;
d768281e KO	293	extern size_t vmcoreinfo_max_size;
dc009d92	294
4fc9bbf9 KA	295	/* flag to track if kexec reboot is in progress */
	296	extern bool kexec_in_progress;
	297
cba63c30 BW	298	int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
cba63c30 BW	299	unsigned long long crash_size, unsigned long long crash_base);
55a20ee7 YL	300	int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
55a20ee7 YL	301	unsigned long long crash_size, unsigned long long crash_base);
0212f915 YL	302	int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
0212f915 YL	303	unsigned long long crash_size, unsigned long long crash_base);
06a7f711 AW	304	int crash_shrink_memory(unsigned long new_size);
06a7f711 AW	305	size_t crash_get_memory_size(void);
c0bb9e45	306	void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
a7956113	307
dc009d92	308	#else /* !CONFIG_KEXEC */
6e274d14 AN	309	struct pt_regs;
	310	struct task_struct;
	311	static inline void crash_kexec(struct pt_regs *regs) { }
	312	static inline int kexec_should_crash(struct task_struct *p) { return 0; }
dc009d92 EB	313	#endif /* CONFIG_KEXEC */
dc009d92 EB	314	#endif /* LINUX_KEXEC_H */