[deliverable/linux.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 <asm/io.h>

#include <uapi/linux/kexec.h>

#ifdef CONFIG_KEXEC_CORE
#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_MEMORY_GFP
#define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL | __GFP_NORETRY)
#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

#ifdef CONFIG_KEXEC_FILE
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;
};

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);

#ifdef CONFIG_KEXEC_VERIFY_SIG
typedef int (kexec_verify_sig_t)(const char *kernel_buf,
				 unsigned long kernel_len);
#endif

struct kexec_file_ops {
	kexec_probe_t *probe;
	kexec_load_t *load;
	kexec_cleanup_t *cleanup;
#ifdef CONFIG_KEXEC_VERIFY_SIG
	kexec_verify_sig_t *verify_sig;
#endif
};
#endif

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

#ifdef CONFIG_KEXEC_FILE
	/* 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;
#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);
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 *);
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);
__printf(1, 2)
void vmcoreinfo_append_str(const char *fmt, ...);
phys_addr_t 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);

int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
					 unsigned long buf_len);
void * __weak arch_kexec_kernel_image_load(struct kimage *image);
int __weak arch_kimage_file_post_load_cleanup(struct kimage *image);
int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
					unsigned long buf_len);
int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr,
					Elf_Shdr *sechdrs, unsigned int relsec);
int __weak arch_kexec_apply_relocations(const Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
					unsigned int relsec);
void arch_kexec_protect_crashkres(void);
void arch_kexec_unprotect_crashkres(void);

#ifndef page_to_boot_pfn
static inline unsigned long page_to_boot_pfn(struct page *page)
{
	return page_to_pfn(page);
}
#endif

#ifndef boot_pfn_to_page
static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
{
	return pfn_to_page(boot_pfn);
}
#endif

#ifndef phys_to_boot_phys
static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
{
	return phys;
}
#endif

#ifndef boot_phys_to_phys
static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys)
{
	return boot_phys;
}
#endif

static inline unsigned long virt_to_boot_phys(void *addr)
{
	return phys_to_boot_phys(__pa((unsigned long)addr));
}

static inline void *boot_phys_to_virt(unsigned long entry)
{
	return phys_to_virt(boot_phys_to_phys(entry));
}

#else /* !CONFIG_KEXEC_CORE */
struct pt_regs;
struct task_struct;
static inline void __crash_kexec(struct pt_regs *regs) { }
static inline void crash_kexec(struct pt_regs *regs) { }
static inline int kexec_should_crash(struct task_struct *p) { return 0; }
#define kexec_in_progress false
#endif /* CONFIG_KEXEC_CORE */

#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
43546d86 RK	17	#include <asm/io.h>
43546d86 RK	18
607ca46e	19	#include <uapi/linux/kexec.h>
29a5c67e	20
2965faa5	21	#ifdef CONFIG_KEXEC_CORE
dc009d92 EB	22	#include <linux/list.h>
	23	#include <linux/linkage.h>
	24	#include <linux/compat.h>
9c15e852	25	#include <linux/ioport.h>
6672f76a SH	26	#include <linux/elfcore.h>
6672f76a SH	27	#include <linux/elf.h>
12db5562	28	#include <linux/module.h>
dc009d92 EB	29	#include <asm/kexec.h>
	30
	31	/* Verify architecture specific macros are defined */
	32
	33	#ifndef KEXEC_SOURCE_MEMORY_LIMIT
	34	#error KEXEC_SOURCE_MEMORY_LIMIT not defined
	35	#endif
	36
	37	#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
	38	#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
	39	#endif
	40
	41	#ifndef KEXEC_CONTROL_MEMORY_LIMIT
	42	#error KEXEC_CONTROL_MEMORY_LIMIT not defined
	43	#endif
	44
7e01b5ac	45	#ifndef KEXEC_CONTROL_MEMORY_GFP
dc5cccac	46	#define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL \| __GFP_NORETRY)
7e01b5ac MS	47	#endif
7e01b5ac MS	48
163f6876 HY	49	#ifndef KEXEC_CONTROL_PAGE_SIZE
163f6876 HY	50	#error KEXEC_CONTROL_PAGE_SIZE not defined
dc009d92 EB	51	#endif
	52
	53	#ifndef KEXEC_ARCH
	54	#error KEXEC_ARCH not defined
	55	#endif
	56
3d214fae MH	57	#ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
	58	#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
	59	#endif
	60
558df720 MH	61	#ifndef KEXEC_CRASH_MEM_ALIGN
	62	#define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
	63	#endif
	64
6672f76a SH	65	#define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
	66	#define KEXEC_CORE_NOTE_NAME "CORE"
	67	#define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
	68	#define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
	69	/*
	70	* The per-cpu notes area is a list of notes terminated by a "NULL"
	71	* note header. For kdump, the code in vmcore.c runs in the context
	72	* of the second kernel to combine them into one note.
	73	*/
cb78edfd	74	#ifndef KEXEC_NOTE_BYTES
6672f76a SH	75	#define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \
	76	KEXEC_CORE_NOTE_NAME_BYTES + \
	77	KEXEC_CORE_NOTE_DESC_BYTES )
cb78edfd	78	#endif
6672f76a	79
dc009d92 EB	80	/*
	81	* This structure is used to hold the arguments that are used when loading
	82	* kernel binaries.
	83	*/
	84
	85	typedef unsigned long kimage_entry_t;
dc009d92	86
dc009d92	87	struct kexec_segment {
815d5704 VG	88	/*
	89	* This pointer can point to user memory if kexec_load() system
	90	* call is used or will point to kernel memory if
	91	* kexec_file_load() system call is used.
	92	*
	93	* Use ->buf when expecting to deal with user memory and use ->kbuf
	94	* when expecting to deal with kernel memory.
	95	*/
	96	union {
	97	void __user *buf;
	98	void *kbuf;
	99	};
dc009d92	100	size_t bufsz;
29a5c67e	101	unsigned long mem;
dc009d92 EB	102	size_t memsz;
	103	};
	104
	105	#ifdef CONFIG_COMPAT
	106	struct compat_kexec_segment {
	107	compat_uptr_t buf;
	108	compat_size_t bufsz;
	109	compat_ulong_t mem; /* User space sees this as a (void ) ... /
	110	compat_size_t memsz;
	111	};
	112	#endif
	113
978e30c9	114	#ifdef CONFIG_KEXEC_FILE
12db5562 VG	115	struct purgatory_info {
	116	/* Pointer to elf header of read only purgatory */
	117	Elf_Ehdr *ehdr;
	118
	119	/* Pointer to purgatory sechdrs which are modifiable */
	120	Elf_Shdr *sechdrs;
	121	/*
	122	* Temporary buffer location where purgatory is loaded and relocated
	123	* This memory can be freed post image load
	124	*/
	125	void *purgatory_buf;
	126
	127	/* Address where purgatory is finally loaded and is executed from */
	128	unsigned long purgatory_load_addr;
	129	};
	130
978e30c9 XP	131	typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
	132	typedef void (kexec_load_t)(struct kimage image, char *kernel_buf,
	133	unsigned long kernel_len, char *initrd,
	134	unsigned long initrd_len, char *cmdline,
	135	unsigned long cmdline_len);
	136	typedef int (kexec_cleanup_t)(void *loader_data);
	137
	138	#ifdef CONFIG_KEXEC_VERIFY_SIG
	139	typedef int (kexec_verify_sig_t)(const char *kernel_buf,
	140	unsigned long kernel_len);
	141	#endif
	142
	143	struct kexec_file_ops {
	144	kexec_probe_t *probe;
	145	kexec_load_t *load;
	146	kexec_cleanup_t *cleanup;
	147	#ifdef CONFIG_KEXEC_VERIFY_SIG
	148	kexec_verify_sig_t *verify_sig;
	149	#endif
	150	};
	151	#endif
	152
dc009d92 EB	153	struct kimage {
	154	kimage_entry_t head;
	155	kimage_entry_t *entry;
	156	kimage_entry_t *last_entry;
	157
dc009d92 EB	158	unsigned long start;
dc009d92 EB	159	struct page *control_code_page;
3ab83521	160	struct page *swap_page;
dc009d92 EB	161
	162	unsigned long nr_segments;
	163	struct kexec_segment segment[KEXEC_SEGMENT_MAX];
	164
	165	struct list_head control_pages;
	166	struct list_head dest_pages;
7d3e2bca	167	struct list_head unusable_pages;
dc009d92 EB	168
	169	/* Address of next control page to allocate for crash kernels. */
	170	unsigned long control_page;
	171
	172	/* Flags to indicate special processing */
	173	unsigned int type : 1;
	174	#define KEXEC_TYPE_DEFAULT 0
	175	#define KEXEC_TYPE_CRASH 1
3ab83521	176	unsigned int preserve_context : 1;
cb105258 VG	177	/* If set, we are using file mode kexec syscall */
cb105258 VG	178	unsigned int file_mode:1;
92be3d6b HY	179
	180	#ifdef ARCH_HAS_KIMAGE_ARCH
	181	struct kimage_arch arch;
	182	#endif
cb105258	183
978e30c9	184	#ifdef CONFIG_KEXEC_FILE
cb105258 VG	185	/* Additional fields for file based kexec syscall */
	186	void *kernel_buf;
	187	unsigned long kernel_buf_len;
	188
	189	void *initrd_buf;
	190	unsigned long initrd_buf_len;
	191
	192	char *cmdline_buf;
	193	unsigned long cmdline_buf_len;
	194
	195	/* File operations provided by image loader */
	196	struct kexec_file_ops *fops;
	197
	198	/* Image loader handling the kernel can store a pointer here */
	199	void *image_loader_data;
12db5562 VG	200
	201	/* Information for loading purgatory */
	202	struct purgatory_info purgatory_info;
978e30c9	203	#endif
cb105258	204	};
dc009d92 EB	205
dc009d92 EB	206	/* kexec interface functions */
3ab83521	207	extern void machine_kexec(struct kimage *image);
dc009d92 EB	208	extern int machine_kexec_prepare(struct kimage *image);
	209	extern void machine_kexec_cleanup(struct kimage *image);
	210	extern asmlinkage long sys_kexec_load(unsigned long entry,
72414d3f MS	211	unsigned long nr_segments,
	212	struct kexec_segment __user *segments,
	213	unsigned long flags);
3ab83521	214	extern int kernel_kexec(void);
cb105258 VG	215	extern int kexec_add_buffer(struct kimage image, char buffer,
	216	unsigned long bufsz, unsigned long memsz,
	217	unsigned long buf_align, unsigned long buf_min,
	218	unsigned long buf_max, bool top_down,
	219	unsigned long *load_addr);
72414d3f MS	220	extern struct page kimage_alloc_control_pages(struct kimage image,
72414d3f MS	221	unsigned int order);
12db5562 VG	222	extern int kexec_load_purgatory(struct kimage *image, unsigned long min,
	223	unsigned long max, int top_down,
	224	unsigned long *load_addr);
	225	extern int kexec_purgatory_get_set_symbol(struct kimage *image,
	226	const char name, void buf,
	227	unsigned int size, bool get_value);
	228	extern void kexec_purgatory_get_symbol_addr(struct kimage image,
	229	const char *name);
7bbee5ca	230	extern void __crash_kexec(struct pt_regs *);
6e274d14 AN	231	extern void crash_kexec(struct pt_regs *);
6e274d14 AN	232	int kexec_should_crash(struct task_struct *);
85916f81	233	void crash_save_cpu(struct pt_regs *regs, int cpu);
fd59d231 KO	234	void crash_save_vmcoreinfo(void);
fd59d231 KO	235	void arch_crash_save_vmcoreinfo(void);
b9075fa9 JP	236	__printf(1, 2)
b9075fa9 JP	237	void vmcoreinfo_append_str(const char *fmt, ...);
dae28018	238	phys_addr_t paddr_vmcoreinfo_note(void);
fd59d231	239
c6e2bee2 BW	240	#define VMCOREINFO_OSRELEASE(value) \
c6e2bee2 BW	241	vmcoreinfo_append_str("OSRELEASE=%s\n", value)
bba1f603 KO	242	#define VMCOREINFO_PAGESIZE(value) \
bba1f603 KO	243	vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
bcbba6c1	244	#define VMCOREINFO_SYMBOL(name) \
fd59d231	245	vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
bcbba6c1	246	#define VMCOREINFO_SIZE(name) \
6cfa062f KO	247	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
6cfa062f KO	248	(unsigned long)sizeof(name))
c76f860c KO	249	#define VMCOREINFO_STRUCT_SIZE(name) \
	250	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
	251	(unsigned long)sizeof(struct name))
bcbba6c1	252	#define VMCOREINFO_OFFSET(name, field) \
d768281e	253	vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
1e4f2955	254	(unsigned long)offsetof(struct name, field))
bcbba6c1	255	#define VMCOREINFO_LENGTH(name, value) \
d768281e	256	vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
bcbba6c1	257	#define VMCOREINFO_NUMBER(name) \
6cfa062f	258	vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
bcbba6c1	259	#define VMCOREINFO_CONFIG(name) \
fd59d231 KO	260	vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
fd59d231 KO	261
dc009d92	262	extern struct kimage *kexec_image;
c330dda9	263	extern struct kimage *kexec_crash_image;
7984754b	264	extern int kexec_load_disabled;
dc009d92	265
a7956113 ZN	266	#ifndef kexec_flush_icache_page
	267	#define kexec_flush_icache_page(page)
	268	#endif
	269
3ab83521 HY	270	/* List of defined/legal kexec flags */
	271	#ifndef CONFIG_KEXEC_JUMP
	272	#define KEXEC_FLAGS KEXEC_ON_CRASH
	273	#else
	274	#define KEXEC_FLAGS (KEXEC_ON_CRASH \| KEXEC_PRESERVE_CONTEXT)
	275	#endif
dc009d92	276
cb105258 VG	277	/* List of defined/legal kexec file flags */
	278	#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD \| KEXEC_FILE_ON_CRASH \| \
	279	KEXEC_FILE_NO_INITRAMFS)
	280
fd59d231 KO	281	#define VMCOREINFO_BYTES (4096)
	282	#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
	283	#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
	284	#define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
	285	+ VMCOREINFO_NOTE_NAME_BYTES)
	286
dc009d92 EB	287	/* Location of a reserved region to hold the crash kernel.
	288	*/
	289	extern struct resource crashk_res;
0212f915	290	extern struct resource crashk_low_res;
6672f76a	291	typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
43cf38eb	292	extern note_buf_t __percpu *crash_notes;
fd59d231	293	extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
d768281e KO	294	extern size_t vmcoreinfo_size;
d768281e KO	295	extern size_t vmcoreinfo_max_size;
dc009d92	296
4fc9bbf9 KA	297	/* flag to track if kexec reboot is in progress */
	298	extern bool kexec_in_progress;
	299
cba63c30 BW	300	int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
cba63c30 BW	301	unsigned long long crash_size, unsigned long long crash_base);
55a20ee7 YL	302	int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
55a20ee7 YL	303	unsigned long long crash_size, unsigned long long crash_base);
0212f915 YL	304	int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
0212f915 YL	305	unsigned long long crash_size, unsigned long long crash_base);
06a7f711 AW	306	int crash_shrink_memory(unsigned long new_size);
06a7f711 AW	307	size_t crash_get_memory_size(void);
c0bb9e45	308	void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
a7956113	309
a43cac0d DY	310	int __weak arch_kexec_kernel_image_probe(struct kimage image, void buf,
	311	unsigned long buf_len);
	312	void * __weak arch_kexec_kernel_image_load(struct kimage *image);
	313	int __weak arch_kimage_file_post_load_cleanup(struct kimage *image);
	314	int __weak arch_kexec_kernel_verify_sig(struct kimage image, void buf,
	315	unsigned long buf_len);
	316	int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr,
	317	Elf_Shdr *sechdrs, unsigned int relsec);
	318	int __weak arch_kexec_apply_relocations(const Elf_Ehdr ehdr, Elf_Shdr sechdrs,
	319	unsigned int relsec);
9b492cf5 XP	320	void arch_kexec_protect_crashkres(void);
9b492cf5 XP	321	void arch_kexec_unprotect_crashkres(void);
a43cac0d	322
43546d86 RK	323	#ifndef page_to_boot_pfn
	324	static inline unsigned long page_to_boot_pfn(struct page *page)
	325	{
	326	return page_to_pfn(page);
	327	}
	328	#endif
	329
	330	#ifndef boot_pfn_to_page
	331	static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
	332	{
	333	return pfn_to_page(boot_pfn);
	334	}
	335	#endif
	336
	337	#ifndef phys_to_boot_phys
	338	static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
	339	{
	340	return phys;
	341	}
	342	#endif
	343
	344	#ifndef boot_phys_to_phys
	345	static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys)
	346	{
	347	return boot_phys;
	348	}
	349	#endif
	350
	351	static inline unsigned long virt_to_boot_phys(void *addr)
	352	{
	353	return phys_to_boot_phys(__pa((unsigned long)addr));
	354	}
	355
	356	static inline void *boot_phys_to_virt(unsigned long entry)
	357	{
	358	return phys_to_virt(boot_phys_to_phys(entry));
	359	}
	360
2965faa5	361	#else /* !CONFIG_KEXEC_CORE */
6e274d14 AN	362	struct pt_regs;
6e274d14 AN	363	struct task_struct;
7bbee5ca	364	static inline void __crash_kexec(struct pt_regs *regs) { }
6e274d14 AN	365	static inline void crash_kexec(struct pt_regs *regs) { }
6e274d14 AN	366	static inline int kexec_should_crash(struct task_struct *p) { return 0; }
2b94ed24	367	#define kexec_in_progress false
2965faa5	368	#endif /* CONFIG_KEXEC_CORE */
cf2df639 GL	369
	370	#endif /* !defined(__ASSEBMLY__) */
	371
dc009d92	372	#endif /* LINUX_KEXEC_H */