[linux-block.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/vmcore_info.h>
#include <linux/crash_reserve.h>
#include <asm/io.h>
#include <linux/range.h>

#include <uapi/linux/kexec.h>
#include <linux/verification.h>

extern note_buf_t __percpu *crash_notes;

#ifdef CONFIG_CRASH_DUMP
#include <linux/prandom.h>
#endif

#ifdef CONFIG_KEXEC_CORE
#include <linux/list.h>
#include <linux/compat.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/highmem.h>
#include <asm/kexec.h>
#include <linux/crash_core.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

/*
 * 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 at the beginning of kexec_purgatory.
	 * Note: kexec_purgatory is read only
	 */
	const Elf_Ehdr *ehdr;
	/*
	 * Temporary, modifiable buffer for sechdrs used for relocation.
	 * This memory can be freed post image load.
	 */
	Elf_Shdr *sechdrs;
	/*
	 * Temporary, modifiable buffer for stripped purgatory used for
	 * relocation. This memory can be freed post image load.
	 */
	void *purgatory_buf;
};

struct kimage;

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_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_SIG
	kexec_verify_sig_t *verify_sig;
#endif
};

extern const struct kexec_file_ops * const kexec_file_loaders[];

int kexec_image_probe_default(struct kimage *image, void *buf,
			      unsigned long buf_len);
int kexec_image_post_load_cleanup_default(struct kimage *image);

/*
 * If kexec_buf.mem is set to this value, kexec_locate_mem_hole()
 * will try to allocate free memory. Arch may overwrite it.
 */
#ifndef KEXEC_BUF_MEM_UNKNOWN
#define KEXEC_BUF_MEM_UNKNOWN 0
#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.
 * @random:	Place the buffer at a random position.
 */
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;
#ifdef CONFIG_CRASH_DUMP
	bool random;
#endif
};


#ifdef CONFIG_CRASH_DUMP
static inline void kexec_random_range_start(unsigned long start,
					    unsigned long end,
					    struct kexec_buf *kbuf,
					    unsigned long *temp_start)
{
	unsigned short i;

	if (kbuf->random) {
		get_random_bytes(&i, sizeof(unsigned short));
		*temp_start = start + (end - start) / USHRT_MAX * i;
	}
}
#else
static inline void kexec_random_range_start(unsigned long start,
					    unsigned long end,
					    struct kexec_buf *kbuf,
					    unsigned long *temp_start)
{}
#endif

int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf);
int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
				   void *buf, unsigned int size,
				   bool get_value);
void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name);

#ifndef arch_kexec_kernel_image_probe
static inline int
arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len)
{
	return kexec_image_probe_default(image, buf, buf_len);
}
#endif

#ifndef arch_kimage_file_post_load_cleanup
static inline int arch_kimage_file_post_load_cleanup(struct kimage *image)
{
	return kexec_image_post_load_cleanup_default(image);
}
#endif

#ifndef arch_check_excluded_range
static inline int arch_check_excluded_range(struct kimage *image,
					    unsigned long start,
					    unsigned long end)
{
	return 0;
}
#endif

#ifdef CONFIG_KEXEC_SIG
#ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
int kexec_kernel_verify_pe_sig(const char *kernel, unsigned long kernel_len);
#endif
#endif

extern int kexec_add_buffer(struct kexec_buf *kbuf);
int kexec_locate_mem_hole(struct kexec_buf *kbuf);

#ifndef arch_kexec_locate_mem_hole
/**
 * arch_kexec_locate_mem_hole - Find free memory to place the segments.
 * @kbuf:                       Parameters for the memory search.
 *
 * On success, kbuf->mem will have the start address of the memory region found.
 *
 * Return: 0 on success, negative errno on error.
 */
static inline int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf)
{
	return kexec_locate_mem_hole(kbuf);
}
#endif

#ifndef arch_kexec_apply_relocations_add
/*
 * arch_kexec_apply_relocations_add - apply relocations of type RELA
 * @pi:		Purgatory to be relocated.
 * @section:	Section relocations applying to.
 * @relsec:	Section containing RELAs.
 * @symtab:	Corresponding symtab.
 *
 * Return: 0 on success, negative errno on error.
 */
static inline int
arch_kexec_apply_relocations_add(struct purgatory_info *pi, Elf_Shdr *section,
				 const Elf_Shdr *relsec, const Elf_Shdr *symtab)
{
	pr_err("RELA relocation unsupported.\n");
	return -ENOEXEC;
}
#endif

#ifndef arch_kexec_apply_relocations
/*
 * arch_kexec_apply_relocations - apply relocations of type REL
 * @pi:		Purgatory to be relocated.
 * @section:	Section relocations applying to.
 * @relsec:	Section containing RELs.
 * @symtab:	Corresponding symtab.
 *
 * Return: 0 on success, negative errno on error.
 */
static inline int
arch_kexec_apply_relocations(struct purgatory_info *pi, Elf_Shdr *section,
			     const Elf_Shdr *relsec, const Elf_Shdr *symtab)
{
	pr_err("REL relocation unsupported.\n");
	return -ENOEXEC;
}
#endif
#endif /* CONFIG_KEXEC_FILE */

#ifdef CONFIG_KEXEC_ELF
struct kexec_elf_info {
	/*
	 * Where the ELF binary contents are kept.
	 * Memory managed by the user of the struct.
	 */
	const char *buffer;

	const struct elfhdr *ehdr;
	const struct elf_phdr *proghdrs;
};

int kexec_build_elf_info(const char *buf, size_t len, struct elfhdr *ehdr,
			       struct kexec_elf_info *elf_info);

int kexec_elf_load(struct kimage *image, struct elfhdr *ehdr,
			 struct kexec_elf_info *elf_info,
			 struct kexec_buf *kbuf,
			 unsigned long *lowest_load_addr);

void kexec_free_elf_info(struct kexec_elf_info *elf_info);
int kexec_elf_probe(const char *buf, unsigned long len);
#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;
	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 CONFIG_CRASH_HOTPLUG
	/* If set, it is safe to update kexec segments that are
	 * excluded from SHA calculation.
	 */
	unsigned int hotplug_support:1;
#endif

#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 */
	const 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

#ifdef CONFIG_CRASH_HOTPLUG
	int hp_action;
	int elfcorehdr_index;
	bool elfcorehdr_updated;
#endif

#ifdef CONFIG_IMA_KEXEC
	/* Virtual address of IMA measurement buffer for kexec syscall */
	void *ima_buffer;

	phys_addr_t ima_buffer_addr;
	size_t ima_buffer_size;

	unsigned long ima_segment_index;
	bool is_ima_segment_index_set;
#endif

	struct {
		struct kexec_segment *scratch;
		phys_addr_t fdt;
	} kho;

	/* Core ELF header buffer */
	void *elf_headers;
	unsigned long elf_headers_sz;
	unsigned long elf_load_addr;

	/* dm crypt keys buffer */
	unsigned long dm_crypt_keys_addr;
	unsigned long dm_crypt_keys_sz;
};

/* 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 int kernel_kexec(void);
extern struct page *kimage_alloc_control_pages(struct kimage *image,
						unsigned int order);

#ifndef machine_kexec_post_load
static inline int machine_kexec_post_load(struct kimage *image) { return 0; }
#endif

extern struct kimage *kexec_image;
extern struct kimage *kexec_crash_image;

bool kexec_load_permitted(int kexec_image_type);

#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 | KEXEC_UPDATE_ELFCOREHDR | KEXEC_CRASH_HOTPLUG_SUPPORT)
#else
#define KEXEC_FLAGS    (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT | KEXEC_UPDATE_ELFCOREHDR | \
			KEXEC_CRASH_HOTPLUG_SUPPORT)
#endif

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

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

#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

#ifndef crash_free_reserved_phys_range
static inline void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
{
	unsigned long addr;

	for (addr = begin; addr < end; addr += PAGE_SIZE)
		free_reserved_page(boot_pfn_to_page(addr >> PAGE_SHIFT));
}
#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

extern bool kexec_file_dbg_print;

#define kexec_dprintk(fmt, arg...) \
        do { if (kexec_file_dbg_print) pr_info(fmt, ##arg); } while (0)

extern void *kimage_map_segment(struct kimage *image, unsigned long addr, unsigned long size);
extern void kimage_unmap_segment(void *buffer);
#else /* !CONFIG_KEXEC_CORE */
struct pt_regs;
struct task_struct;
struct kimage;
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; }
static inline void *kimage_map_segment(struct kimage *image, unsigned long addr, unsigned long size)
{ return NULL; }
static inline void kimage_unmap_segment(void *buffer) { }
#define kexec_in_progress false
#endif /* CONFIG_KEXEC_CORE */

#ifdef CONFIG_KEXEC_SIG
void set_kexec_sig_enforced(void);
#else
static inline void set_kexec_sig_enforced(void) {}
#endif

#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/vmcore_info.h>
	19	#include <linux/crash_reserve.h>
	20	#include <asm/io.h>
	21	#include <linux/range.h>
	22
	23	#include <uapi/linux/kexec.h>
	24	#include <linux/verification.h>
	25
	26	extern note_buf_t __percpu *crash_notes;
	27
	28	#ifdef CONFIG_CRASH_DUMP
	29	#include <linux/prandom.h>
	30	#endif
	31
	32	#ifdef CONFIG_KEXEC_CORE
	33	#include <linux/list.h>
	34	#include <linux/compat.h>
	35	#include <linux/ioport.h>
	36	#include <linux/module.h>
	37	#include <linux/highmem.h>
	38	#include <asm/kexec.h>
	39	#include <linux/crash_core.h>
	40
	41	/* Verify architecture specific macros are defined */
	42
	43	#ifndef KEXEC_SOURCE_MEMORY_LIMIT
	44	#error KEXEC_SOURCE_MEMORY_LIMIT not defined
	45	#endif
	46
	47	#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
	48	#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
	49	#endif
	50
	51	#ifndef KEXEC_CONTROL_MEMORY_LIMIT
	52	#error KEXEC_CONTROL_MEMORY_LIMIT not defined
	53	#endif
	54
	55	#ifndef KEXEC_CONTROL_MEMORY_GFP
	56	#define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL \| __GFP_NORETRY)
	57	#endif
	58
	59	#ifndef KEXEC_CONTROL_PAGE_SIZE
	60	#error KEXEC_CONTROL_PAGE_SIZE not defined
	61	#endif
	62
	63	#ifndef KEXEC_ARCH
	64	#error KEXEC_ARCH not defined
	65	#endif
	66
	67	#ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
	68	#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
	69	#endif
	70
	71	#ifndef KEXEC_CRASH_MEM_ALIGN
	72	#define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
	73	#endif
	74
	75	/*
	76	* This structure is used to hold the arguments that are used when loading
	77	* kernel binaries.
	78	*/
	79
	80	typedef unsigned long kimage_entry_t;
	81
	82	struct kexec_segment {
	83	/*
	84	* This pointer can point to user memory if kexec_load() system
	85	* call is used or will point to kernel memory if
	86	* kexec_file_load() system call is used.
	87	*
	88	* Use ->buf when expecting to deal with user memory and use ->kbuf
	89	* when expecting to deal with kernel memory.
	90	*/
	91	union {
	92	void __user *buf;
	93	void *kbuf;
	94	};
	95	size_t bufsz;
	96	unsigned long mem;
	97	size_t memsz;
	98	};
	99
	100	#ifdef CONFIG_COMPAT
	101	struct compat_kexec_segment {
	102	compat_uptr_t buf;
	103	compat_size_t bufsz;
	104	compat_ulong_t mem; /* User space sees this as a (void ) ... /
	105	compat_size_t memsz;
	106	};
	107	#endif
	108
	109	#ifdef CONFIG_KEXEC_FILE
	110	struct purgatory_info {
	111	/*
	112	* Pointer to elf header at the beginning of kexec_purgatory.
	113	* Note: kexec_purgatory is read only
	114	*/
	115	const Elf_Ehdr *ehdr;
	116	/*
	117	* Temporary, modifiable buffer for sechdrs used for relocation.
	118	* This memory can be freed post image load.
	119	*/
	120	Elf_Shdr *sechdrs;
	121	/*
	122	* Temporary, modifiable buffer for stripped purgatory used for
	123	* relocation. This memory can be freed post image load.
	124	*/
	125	void *purgatory_buf;
	126	};
	127
	128	struct kimage;
	129
	130	typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
	131	typedef void (kexec_load_t)(struct kimage image, char *kernel_buf,
	132	unsigned long kernel_len, char *initrd,
	133	unsigned long initrd_len, char *cmdline,
	134	unsigned long cmdline_len);
	135	typedef int (kexec_cleanup_t)(void *loader_data);
	136
	137	#ifdef CONFIG_KEXEC_SIG
	138	typedef int (kexec_verify_sig_t)(const char *kernel_buf,
	139	unsigned long kernel_len);
	140	#endif
	141
	142	struct kexec_file_ops {
	143	kexec_probe_t *probe;
	144	kexec_load_t *load;
	145	kexec_cleanup_t *cleanup;
	146	#ifdef CONFIG_KEXEC_SIG
	147	kexec_verify_sig_t *verify_sig;
	148	#endif
	149	};
	150
	151	extern const struct kexec_file_ops * const kexec_file_loaders[];
	152
	153	int kexec_image_probe_default(struct kimage image, void buf,
	154	unsigned long buf_len);
	155	int kexec_image_post_load_cleanup_default(struct kimage *image);
	156
	157	/*
	158	* If kexec_buf.mem is set to this value, kexec_locate_mem_hole()
	159	* will try to allocate free memory. Arch may overwrite it.
	160	*/
	161	#ifndef KEXEC_BUF_MEM_UNKNOWN
	162	#define KEXEC_BUF_MEM_UNKNOWN 0
	163	#endif
	164
	165	/**
	166	* struct kexec_buf - parameters for finding a place for a buffer in memory
	167	* @image: kexec image in which memory to search.
	168	* @buffer: Contents which will be copied to the allocated memory.
	169	* @bufsz: Size of @buffer.
	170	* @mem: On return will have address of the buffer in memory.
	171	* @memsz: Size for the buffer in memory.
	172	* @buf_align: Minimum alignment needed.
	173	* @buf_min: The buffer can't be placed below this address.
	174	* @buf_max: The buffer can't be placed above this address.
	175	* @top_down: Allocate from top of memory.
	176	* @random: Place the buffer at a random position.
	177	*/
	178	struct kexec_buf {
	179	struct kimage *image;
	180	void *buffer;
	181	unsigned long bufsz;
	182	unsigned long mem;
	183	unsigned long memsz;
	184	unsigned long buf_align;
	185	unsigned long buf_min;
	186	unsigned long buf_max;
	187	bool top_down;
	188	#ifdef CONFIG_CRASH_DUMP
	189	bool random;
	190	#endif
	191	};
	192
	193
	194	#ifdef CONFIG_CRASH_DUMP
	195	static inline void kexec_random_range_start(unsigned long start,
	196	unsigned long end,
	197	struct kexec_buf *kbuf,
	198	unsigned long *temp_start)
	199	{
	200	unsigned short i;
	201
	202	if (kbuf->random) {
	203	get_random_bytes(&i, sizeof(unsigned short));
	204	temp_start = start + (end - start) / USHRT_MAX i;
	205	}
	206	}
	207	#else
	208	static inline void kexec_random_range_start(unsigned long start,
	209	unsigned long end,
	210	struct kexec_buf *kbuf,
	211	unsigned long *temp_start)
	212	{}
	213	#endif
	214
	215	int kexec_load_purgatory(struct kimage image, struct kexec_buf kbuf);
	216	int kexec_purgatory_get_set_symbol(struct kimage image, const char name,
	217	void *buf, unsigned int size,
	218	bool get_value);
	219	void kexec_purgatory_get_symbol_addr(struct kimage image, const char *name);
	220
	221	#ifndef arch_kexec_kernel_image_probe
	222	static inline int
	223	arch_kexec_kernel_image_probe(struct kimage image, void buf, unsigned long buf_len)
	224	{
	225	return kexec_image_probe_default(image, buf, buf_len);
	226	}
	227	#endif
	228
	229	#ifndef arch_kimage_file_post_load_cleanup
	230	static inline int arch_kimage_file_post_load_cleanup(struct kimage *image)
	231	{
	232	return kexec_image_post_load_cleanup_default(image);
	233	}
	234	#endif
	235
	236	#ifndef arch_check_excluded_range
	237	static inline int arch_check_excluded_range(struct kimage *image,
	238	unsigned long start,
	239	unsigned long end)
	240	{
	241	return 0;
	242	}
	243	#endif
	244
	245	#ifdef CONFIG_KEXEC_SIG
	246	#ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
	247	int kexec_kernel_verify_pe_sig(const char *kernel, unsigned long kernel_len);
	248	#endif
	249	#endif
	250
	251	extern int kexec_add_buffer(struct kexec_buf *kbuf);
	252	int kexec_locate_mem_hole(struct kexec_buf *kbuf);
	253
	254	#ifndef arch_kexec_locate_mem_hole
	255	/**
	256	* arch_kexec_locate_mem_hole - Find free memory to place the segments.
	257	* @kbuf: Parameters for the memory search.
	258	*
	259	* On success, kbuf->mem will have the start address of the memory region found.
	260	*
	261	* Return: 0 on success, negative errno on error.
	262	*/
	263	static inline int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf)
	264	{
	265	return kexec_locate_mem_hole(kbuf);
	266	}
	267	#endif
	268
	269	#ifndef arch_kexec_apply_relocations_add
	270	/*
	271	* arch_kexec_apply_relocations_add - apply relocations of type RELA
	272	* @pi: Purgatory to be relocated.
	273	* @section: Section relocations applying to.
	274	* @relsec: Section containing RELAs.
	275	* @symtab: Corresponding symtab.
	276	*
	277	* Return: 0 on success, negative errno on error.
	278	*/
	279	static inline int
	280	arch_kexec_apply_relocations_add(struct purgatory_info pi, Elf_Shdr section,
	281	const Elf_Shdr relsec, const Elf_Shdr symtab)
	282	{
	283	pr_err("RELA relocation unsupported.\n");
	284	return -ENOEXEC;
	285	}
	286	#endif
	287
	288	#ifndef arch_kexec_apply_relocations
	289	/*
	290	* arch_kexec_apply_relocations - apply relocations of type REL
	291	* @pi: Purgatory to be relocated.
	292	* @section: Section relocations applying to.
	293	* @relsec: Section containing RELs.
	294	* @symtab: Corresponding symtab.
	295	*
	296	* Return: 0 on success, negative errno on error.
	297	*/
	298	static inline int
	299	arch_kexec_apply_relocations(struct purgatory_info pi, Elf_Shdr section,
	300	const Elf_Shdr relsec, const Elf_Shdr symtab)
	301	{
	302	pr_err("REL relocation unsupported.\n");
	303	return -ENOEXEC;
	304	}
	305	#endif
	306	#endif /* CONFIG_KEXEC_FILE */
	307
	308	#ifdef CONFIG_KEXEC_ELF
	309	struct kexec_elf_info {
	310	/*
	311	* Where the ELF binary contents are kept.
	312	* Memory managed by the user of the struct.
	313	*/
	314	const char *buffer;
	315
	316	const struct elfhdr *ehdr;
	317	const struct elf_phdr *proghdrs;
	318	};
	319
	320	int kexec_build_elf_info(const char buf, size_t len, struct elfhdr ehdr,
	321	struct kexec_elf_info *elf_info);
	322
	323	int kexec_elf_load(struct kimage image, struct elfhdr ehdr,
	324	struct kexec_elf_info *elf_info,
	325	struct kexec_buf *kbuf,
	326	unsigned long *lowest_load_addr);
	327
	328	void kexec_free_elf_info(struct kexec_elf_info *elf_info);
	329	int kexec_elf_probe(const char *buf, unsigned long len);
	330	#endif
	331	struct kimage {
	332	kimage_entry_t head;
	333	kimage_entry_t *entry;
	334	kimage_entry_t *last_entry;
	335
	336	unsigned long start;
	337	struct page *control_code_page;
	338	struct page *swap_page;
	339	void vmcoreinfo_data_copy; / locates in the crash memory */
	340
	341	unsigned long nr_segments;
	342	struct kexec_segment segment[KEXEC_SEGMENT_MAX];
	343
	344	struct list_head control_pages;
	345	struct list_head dest_pages;
	346	struct list_head unusable_pages;
	347
	348	/* Address of next control page to allocate for crash kernels. */
	349	unsigned long control_page;
	350
	351	/* Flags to indicate special processing */
	352	unsigned int type : 1;
	353	#define KEXEC_TYPE_DEFAULT 0
	354	#define KEXEC_TYPE_CRASH 1
	355	unsigned int preserve_context : 1;
	356	/* If set, we are using file mode kexec syscall */
	357	unsigned int file_mode:1;
	358	#ifdef CONFIG_CRASH_HOTPLUG
	359	/* If set, it is safe to update kexec segments that are
	360	* excluded from SHA calculation.
	361	*/
	362	unsigned int hotplug_support:1;
	363	#endif
	364
	365	#ifdef ARCH_HAS_KIMAGE_ARCH
	366	struct kimage_arch arch;
	367	#endif
	368
	369	#ifdef CONFIG_KEXEC_FILE
	370	/* Additional fields for file based kexec syscall */
	371	void *kernel_buf;
	372	unsigned long kernel_buf_len;
	373
	374	void *initrd_buf;
	375	unsigned long initrd_buf_len;
	376
	377	char *cmdline_buf;
	378	unsigned long cmdline_buf_len;
	379
	380	/* File operations provided by image loader */
	381	const struct kexec_file_ops *fops;
	382
	383	/* Image loader handling the kernel can store a pointer here */
	384	void *image_loader_data;
	385
	386	/* Information for loading purgatory */
	387	struct purgatory_info purgatory_info;
	388	#endif
	389
	390	#ifdef CONFIG_CRASH_HOTPLUG
	391	int hp_action;
	392	int elfcorehdr_index;
	393	bool elfcorehdr_updated;
	394	#endif
	395
	396	#ifdef CONFIG_IMA_KEXEC
	397	/* Virtual address of IMA measurement buffer for kexec syscall */
	398	void *ima_buffer;
	399
	400	phys_addr_t ima_buffer_addr;
	401	size_t ima_buffer_size;
	402
	403	unsigned long ima_segment_index;
	404	bool is_ima_segment_index_set;
	405	#endif
	406
	407	struct {
	408	struct kexec_segment *scratch;
	409	phys_addr_t fdt;
	410	} kho;
	411
	412	/* Core ELF header buffer */
	413	void *elf_headers;
	414	unsigned long elf_headers_sz;
	415	unsigned long elf_load_addr;
	416
	417	/* dm crypt keys buffer */
	418	unsigned long dm_crypt_keys_addr;
	419	unsigned long dm_crypt_keys_sz;
	420	};
	421
	422	/* kexec interface functions */
	423	extern void machine_kexec(struct kimage *image);
	424	extern int machine_kexec_prepare(struct kimage *image);
	425	extern void machine_kexec_cleanup(struct kimage *image);
	426	extern int kernel_kexec(void);
	427	extern struct page kimage_alloc_control_pages(struct kimage image,
	428	unsigned int order);
	429
	430	#ifndef machine_kexec_post_load
	431	static inline int machine_kexec_post_load(struct kimage *image) { return 0; }
	432	#endif
	433
	434	extern struct kimage *kexec_image;
	435	extern struct kimage *kexec_crash_image;
	436
	437	bool kexec_load_permitted(int kexec_image_type);
	438
	439	#ifndef kexec_flush_icache_page
	440	#define kexec_flush_icache_page(page)
	441	#endif
	442
	443	/* List of defined/legal kexec flags */
	444	#ifndef CONFIG_KEXEC_JUMP
	445	#define KEXEC_FLAGS (KEXEC_ON_CRASH \| KEXEC_UPDATE_ELFCOREHDR \| KEXEC_CRASH_HOTPLUG_SUPPORT)
	446	#else
	447	#define KEXEC_FLAGS (KEXEC_ON_CRASH \| KEXEC_PRESERVE_CONTEXT \| KEXEC_UPDATE_ELFCOREHDR \| \
	448	KEXEC_CRASH_HOTPLUG_SUPPORT)
	449	#endif
	450
	451	/* List of defined/legal kexec file flags */
	452	#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD \| KEXEC_FILE_ON_CRASH \| \
	453	KEXEC_FILE_NO_INITRAMFS \| KEXEC_FILE_DEBUG)
	454
	455	/* flag to track if kexec reboot is in progress */
	456	extern bool kexec_in_progress;
	457
	458	#ifndef page_to_boot_pfn
	459	static inline unsigned long page_to_boot_pfn(struct page *page)
	460	{
	461	return page_to_pfn(page);
	462	}
	463	#endif
	464
	465	#ifndef boot_pfn_to_page
	466	static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
	467	{
	468	return pfn_to_page(boot_pfn);
	469	}
	470	#endif
	471
	472	#ifndef phys_to_boot_phys
	473	static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
	474	{
	475	return phys;
	476	}
	477	#endif
	478
	479	#ifndef boot_phys_to_phys
	480	static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys)
	481	{
	482	return boot_phys;
	483	}
	484	#endif
	485
	486	#ifndef crash_free_reserved_phys_range
	487	static inline void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
	488	{
	489	unsigned long addr;
	490
	491	for (addr = begin; addr < end; addr += PAGE_SIZE)
	492	free_reserved_page(boot_pfn_to_page(addr >> PAGE_SHIFT));
	493	}
	494	#endif
	495
	496	static inline unsigned long virt_to_boot_phys(void *addr)
	497	{
	498	return phys_to_boot_phys(__pa((unsigned long)addr));
	499	}
	500
	501	static inline void *boot_phys_to_virt(unsigned long entry)
	502	{
	503	return phys_to_virt(boot_phys_to_phys(entry));
	504	}
	505
	506	#ifndef arch_kexec_post_alloc_pages
	507	static inline int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp) { return 0; }
	508	#endif
	509
	510	#ifndef arch_kexec_pre_free_pages
	511	static inline void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages) { }
	512	#endif
	513
	514	extern bool kexec_file_dbg_print;
	515
	516	#define kexec_dprintk(fmt, arg...) \
	517	do { if (kexec_file_dbg_print) pr_info(fmt, ##arg); } while (0)
	518
	519	extern void kimage_map_segment(struct kimage image, unsigned long addr, unsigned long size);
	520	extern void kimage_unmap_segment(void *buffer);
	521	#else /* !CONFIG_KEXEC_CORE */
	522	struct pt_regs;
	523	struct task_struct;
	524	struct kimage;
	525	static inline void __crash_kexec(struct pt_regs *regs) { }
	526	static inline void crash_kexec(struct pt_regs *regs) { }
	527	static inline int kexec_should_crash(struct task_struct *p) { return 0; }
	528	static inline int kexec_crash_loaded(void) { return 0; }
	529	static inline void kimage_map_segment(struct kimage image, unsigned long addr, unsigned long size)
	530	{ return NULL; }
	531	static inline void kimage_unmap_segment(void *buffer) { }
	532	#define kexec_in_progress false
	533	#endif /* CONFIG_KEXEC_CORE */
	534
	535	#ifdef CONFIG_KEXEC_SIG
	536	void set_kexec_sig_enforced(void);
	537	#else
	538	static inline void set_kexec_sig_enforced(void) {}
	539	#endif
	540
	541	#endif /* !defined(__ASSEBMLY__) */
	542
	543	#endif /* LINUX_KEXEC_H */