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

/* SPDX-License-Identifier: GPL-2.0 */
#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 <linux/crash_core.h>
#include <asm/io.h>

#include <uapi/linux/kexec.h>

#ifdef CONFIG_KEXEC_CORE
#include <linux/list.h>
#include <linux/compat.h>
#include <linux/ioport.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_CORE_NOTE_NAME	CRASH_CORE_NOTE_NAME

/*
 * 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
};

/**
 * struct kexec_buf - parameters for finding a place for a buffer in memory
 * @image:	kexec image in which memory to search.
 * @buffer:	Contents which will be copied to the allocated memory.
 * @bufsz:	Size of @buffer.
 * @mem:	On return will have address of the buffer in memory.
 * @memsz:	Size for the buffer in memory.
 * @buf_align:	Minimum alignment needed.
 * @buf_min:	The buffer can't be placed below this address.
 * @buf_max:	The buffer can't be placed above this address.
 * @top_down:	Allocate from top of memory.
 */
struct kexec_buf {
	struct kimage *image;
	void *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;
};

int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
			       int (*func)(struct resource *, void *));
extern int kexec_add_buffer(struct kexec_buf *kbuf);
int kexec_locate_mem_hole(struct kexec_buf *kbuf);
#endif /* CONFIG_KEXEC_FILE */

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;
	void *vmcoreinfo_data_copy; /* locates in the crash memory */

	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 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 *);
int kexec_crash_loaded(void);
void crash_save_cpu(struct pt_regs *regs, int cpu);
extern int kimage_crash_copy_vmcoreinfo(struct kimage *image);

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)

/* Location of a reserved region to hold the crash kernel.
 */
extern struct resource crashk_res;
extern struct resource crashk_low_res;
extern note_buf_t __percpu *crash_notes;

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

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));
}

#ifndef arch_kexec_post_alloc_pages
static inline int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp) { return 0; }
#endif

#ifndef arch_kexec_pre_free_pages
static inline void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages) { }
#endif

#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; }
static inline int kexec_crash_loaded(void) { return 0; }
#define kexec_in_progress false
#endif /* CONFIG_KEXEC_CORE */

#endif /* !defined(__ASSEBMLY__) */

#endif /* LINUX_KEXEC_H */
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef LINUX_KEXEC_H
	3	#define LINUX_KEXEC_H
	4
	5	#define IND_DESTINATION_BIT 0
	6	#define IND_INDIRECTION_BIT 1
	7	#define IND_DONE_BIT 2
	8	#define IND_SOURCE_BIT 3
	9
	10	#define IND_DESTINATION (1 << IND_DESTINATION_BIT)
	11	#define IND_INDIRECTION (1 << IND_INDIRECTION_BIT)
	12	#define IND_DONE (1 << IND_DONE_BIT)
	13	#define IND_SOURCE (1 << IND_SOURCE_BIT)
	14	#define IND_FLAGS (IND_DESTINATION \| IND_INDIRECTION \| IND_DONE \| IND_SOURCE)
	15
	16	#if !defined(__ASSEMBLY__)
	17
	18	#include <linux/crash_core.h>
	19	#include <asm/io.h>
	20
	21	#include <uapi/linux/kexec.h>
	22
	23	#ifdef CONFIG_KEXEC_CORE
	24	#include <linux/list.h>
	25	#include <linux/compat.h>
	26	#include <linux/ioport.h>
	27	#include <linux/module.h>
	28	#include <asm/kexec.h>
	29
	30	/* Verify architecture specific macros are defined */
	31
	32	#ifndef KEXEC_SOURCE_MEMORY_LIMIT
	33	#error KEXEC_SOURCE_MEMORY_LIMIT not defined
	34	#endif
	35
	36	#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
	37	#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
	38	#endif
	39
	40	#ifndef KEXEC_CONTROL_MEMORY_LIMIT
	41	#error KEXEC_CONTROL_MEMORY_LIMIT not defined
	42	#endif
	43
	44	#ifndef KEXEC_CONTROL_MEMORY_GFP
	45	#define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL \| __GFP_NORETRY)
	46	#endif
	47
	48	#ifndef KEXEC_CONTROL_PAGE_SIZE
	49	#error KEXEC_CONTROL_PAGE_SIZE not defined
	50	#endif
	51
	52	#ifndef KEXEC_ARCH
	53	#error KEXEC_ARCH not defined
	54	#endif
	55
	56	#ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
	57	#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
	58	#endif
	59
	60	#ifndef KEXEC_CRASH_MEM_ALIGN
	61	#define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
	62	#endif
	63
	64	#define KEXEC_CORE_NOTE_NAME CRASH_CORE_NOTE_NAME
	65
	66	/*
	67	* This structure is used to hold the arguments that are used when loading
	68	* kernel binaries.
	69	*/
	70
	71	typedef unsigned long kimage_entry_t;
	72
	73	struct kexec_segment {
	74	/*
	75	* This pointer can point to user memory if kexec_load() system
	76	* call is used or will point to kernel memory if
	77	* kexec_file_load() system call is used.
	78	*
	79	* Use ->buf when expecting to deal with user memory and use ->kbuf
	80	* when expecting to deal with kernel memory.
	81	*/
	82	union {
	83	void __user *buf;
	84	void *kbuf;
	85	};
	86	size_t bufsz;
	87	unsigned long mem;
	88	size_t memsz;
	89	};
	90
	91	#ifdef CONFIG_COMPAT
	92	struct compat_kexec_segment {
	93	compat_uptr_t buf;
	94	compat_size_t bufsz;
	95	compat_ulong_t mem; /* User space sees this as a (void ) ... /
	96	compat_size_t memsz;
	97	};
	98	#endif
	99
	100	#ifdef CONFIG_KEXEC_FILE
	101	struct purgatory_info {
	102	/* Pointer to elf header of read only purgatory */
	103	Elf_Ehdr *ehdr;
	104
	105	/* Pointer to purgatory sechdrs which are modifiable */
	106	Elf_Shdr *sechdrs;
	107	/*
	108	* Temporary buffer location where purgatory is loaded and relocated
	109	* This memory can be freed post image load
	110	*/
	111	void *purgatory_buf;
	112
	113	/* Address where purgatory is finally loaded and is executed from */
	114	unsigned long purgatory_load_addr;
	115	};
	116
	117	typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
	118	typedef void (kexec_load_t)(struct kimage image, char *kernel_buf,
	119	unsigned long kernel_len, char *initrd,
	120	unsigned long initrd_len, char *cmdline,
	121	unsigned long cmdline_len);
	122	typedef int (kexec_cleanup_t)(void *loader_data);
	123
	124	#ifdef CONFIG_KEXEC_VERIFY_SIG
	125	typedef int (kexec_verify_sig_t)(const char *kernel_buf,
	126	unsigned long kernel_len);
	127	#endif
	128
	129	struct kexec_file_ops {
	130	kexec_probe_t *probe;
	131	kexec_load_t *load;
	132	kexec_cleanup_t *cleanup;
	133	#ifdef CONFIG_KEXEC_VERIFY_SIG
	134	kexec_verify_sig_t *verify_sig;
	135	#endif
	136	};
	137
	138	/**
	139	* struct kexec_buf - parameters for finding a place for a buffer in memory
	140	* @image: kexec image in which memory to search.
	141	* @buffer: Contents which will be copied to the allocated memory.
	142	* @bufsz: Size of @buffer.
	143	* @mem: On return will have address of the buffer in memory.
	144	* @memsz: Size for the buffer in memory.
	145	* @buf_align: Minimum alignment needed.
	146	* @buf_min: The buffer can't be placed below this address.
	147	* @buf_max: The buffer can't be placed above this address.
	148	* @top_down: Allocate from top of memory.
	149	*/
	150	struct kexec_buf {
	151	struct kimage *image;
	152	void *buffer;
	153	unsigned long bufsz;
	154	unsigned long mem;
	155	unsigned long memsz;
	156	unsigned long buf_align;
	157	unsigned long buf_min;
	158	unsigned long buf_max;
	159	bool top_down;
	160	};
	161
	162	int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
	163	int (func)(struct resource , void *));
	164	extern int kexec_add_buffer(struct kexec_buf *kbuf);
	165	int kexec_locate_mem_hole(struct kexec_buf *kbuf);
	166	#endif /* CONFIG_KEXEC_FILE */
	167
	168	struct kimage {
	169	kimage_entry_t head;
	170	kimage_entry_t *entry;
	171	kimage_entry_t *last_entry;
	172
	173	unsigned long start;
	174	struct page *control_code_page;
	175	struct page *swap_page;
	176	void vmcoreinfo_data_copy; / locates in the crash memory */
	177
	178	unsigned long nr_segments;
	179	struct kexec_segment segment[KEXEC_SEGMENT_MAX];
	180
	181	struct list_head control_pages;
	182	struct list_head dest_pages;
	183	struct list_head unusable_pages;
	184
	185	/* Address of next control page to allocate for crash kernels. */
	186	unsigned long control_page;
	187
	188	/* Flags to indicate special processing */
	189	unsigned int type : 1;
	190	#define KEXEC_TYPE_DEFAULT 0
	191	#define KEXEC_TYPE_CRASH 1
	192	unsigned int preserve_context : 1;
	193	/* If set, we are using file mode kexec syscall */
	194	unsigned int file_mode:1;
	195
	196	#ifdef ARCH_HAS_KIMAGE_ARCH
	197	struct kimage_arch arch;
	198	#endif
	199
	200	#ifdef CONFIG_KEXEC_FILE
	201	/* Additional fields for file based kexec syscall */
	202	void *kernel_buf;
	203	unsigned long kernel_buf_len;
	204
	205	void *initrd_buf;
	206	unsigned long initrd_buf_len;
	207
	208	char *cmdline_buf;
	209	unsigned long cmdline_buf_len;
	210
	211	/* File operations provided by image loader */
	212	struct kexec_file_ops *fops;
	213
	214	/* Image loader handling the kernel can store a pointer here */
	215	void *image_loader_data;
	216
	217	/* Information for loading purgatory */
	218	struct purgatory_info purgatory_info;
	219	#endif
	220	};
	221
	222	/* kexec interface functions */
	223	extern void machine_kexec(struct kimage *image);
	224	extern int machine_kexec_prepare(struct kimage *image);
	225	extern void machine_kexec_cleanup(struct kimage *image);
	226	extern asmlinkage long sys_kexec_load(unsigned long entry,
	227	unsigned long nr_segments,
	228	struct kexec_segment __user *segments,
	229	unsigned long flags);
	230	extern int kernel_kexec(void);
	231	extern struct page kimage_alloc_control_pages(struct kimage image,
	232	unsigned int order);
	233	extern int kexec_load_purgatory(struct kimage *image, unsigned long min,
	234	unsigned long max, int top_down,
	235	unsigned long *load_addr);
	236	extern int kexec_purgatory_get_set_symbol(struct kimage *image,
	237	const char name, void buf,
	238	unsigned int size, bool get_value);
	239	extern void kexec_purgatory_get_symbol_addr(struct kimage image,
	240	const char *name);
	241	extern void __crash_kexec(struct pt_regs *);
	242	extern void crash_kexec(struct pt_regs *);
	243	int kexec_should_crash(struct task_struct *);
	244	int kexec_crash_loaded(void);
	245	void crash_save_cpu(struct pt_regs *regs, int cpu);
	246	extern int kimage_crash_copy_vmcoreinfo(struct kimage *image);
	247
	248	extern struct kimage *kexec_image;
	249	extern struct kimage *kexec_crash_image;
	250	extern int kexec_load_disabled;
	251
	252	#ifndef kexec_flush_icache_page
	253	#define kexec_flush_icache_page(page)
	254	#endif
	255
	256	/* List of defined/legal kexec flags */
	257	#ifndef CONFIG_KEXEC_JUMP
	258	#define KEXEC_FLAGS KEXEC_ON_CRASH
	259	#else
	260	#define KEXEC_FLAGS (KEXEC_ON_CRASH \| KEXEC_PRESERVE_CONTEXT)
	261	#endif
	262
	263	/* List of defined/legal kexec file flags */
	264	#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD \| KEXEC_FILE_ON_CRASH \| \
	265	KEXEC_FILE_NO_INITRAMFS)
	266
	267	/* Location of a reserved region to hold the crash kernel.
	268	*/
	269	extern struct resource crashk_res;
	270	extern struct resource crashk_low_res;
	271	extern note_buf_t __percpu *crash_notes;
	272
	273	/* flag to track if kexec reboot is in progress */
	274	extern bool kexec_in_progress;
	275
	276	int crash_shrink_memory(unsigned long new_size);
	277	size_t crash_get_memory_size(void);
	278	void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
	279
	280	int __weak arch_kexec_kernel_image_probe(struct kimage image, void buf,
	281	unsigned long buf_len);
	282	void * __weak arch_kexec_kernel_image_load(struct kimage *image);
	283	int __weak arch_kimage_file_post_load_cleanup(struct kimage *image);
	284	int __weak arch_kexec_kernel_verify_sig(struct kimage image, void buf,
	285	unsigned long buf_len);
	286	int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr,
	287	Elf_Shdr *sechdrs, unsigned int relsec);
	288	int __weak arch_kexec_apply_relocations(const Elf_Ehdr ehdr, Elf_Shdr sechdrs,
	289	unsigned int relsec);
	290	void arch_kexec_protect_crashkres(void);
	291	void arch_kexec_unprotect_crashkres(void);
	292
	293	#ifndef page_to_boot_pfn
	294	static inline unsigned long page_to_boot_pfn(struct page *page)
	295	{
	296	return page_to_pfn(page);
	297	}
	298	#endif
	299
	300	#ifndef boot_pfn_to_page
	301	static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
	302	{
	303	return pfn_to_page(boot_pfn);
	304	}
	305	#endif
	306
	307	#ifndef phys_to_boot_phys
	308	static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
	309	{
	310	return phys;
	311	}
	312	#endif
	313
	314	#ifndef boot_phys_to_phys
	315	static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys)
	316	{
	317	return boot_phys;
	318	}
	319	#endif
	320
	321	static inline unsigned long virt_to_boot_phys(void *addr)
	322	{
	323	return phys_to_boot_phys(__pa((unsigned long)addr));
	324	}
	325
	326	static inline void *boot_phys_to_virt(unsigned long entry)
	327	{
	328	return phys_to_virt(boot_phys_to_phys(entry));
	329	}
	330
	331	#ifndef arch_kexec_post_alloc_pages
	332	static inline int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp) { return 0; }
	333	#endif
	334
	335	#ifndef arch_kexec_pre_free_pages
	336	static inline void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages) { }
	337	#endif
	338
	339	#else /* !CONFIG_KEXEC_CORE */
	340	struct pt_regs;
	341	struct task_struct;
	342	static inline void __crash_kexec(struct pt_regs *regs) { }
	343	static inline void crash_kexec(struct pt_regs *regs) { }
	344	static inline int kexec_should_crash(struct task_struct *p) { return 0; }
	345	static inline int kexec_crash_loaded(void) { return 0; }
	346	#define kexec_in_progress false
	347	#endif /* CONFIG_KEXEC_CORE */
	348
	349	#endif /* !defined(__ASSEBMLY__) */
	350
	351	#endif /* LINUX_KEXEC_H */