#ifndef LINUX_KEXEC_H
#define LINUX_KEXEC_H

#ifdef CONFIG_KEXEC
#include <linux/types.h>
#include <linux/list.h>
#include <linux/linkage.h>
#if !defined(__GENKSYMS__) || !defined(CONFIG_XEN)
#include <linux/compat.h>
#endif
#include <linux/ioport.h>
#include <asm/kexec.h>
#include <linux/elf.h>
#include <linux/elfnote.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_CODE_SIZE
#error KEXEC_CONTROL_CODE_SIZE not defined
#endif

#ifndef KEXEC_ARCH
#error KEXEC_ARCH not defined
#endif

#define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)

#ifndef KEXEC_ARCH_HAS_PAGE_MACROS
#define kexec_page_to_pfn(page)  page_to_pfn(page)
#define kexec_pfn_to_page(pfn)   pfn_to_page(pfn)
#define kexec_virt_to_phys(addr) virt_to_phys(addr)
#define kexec_phys_to_virt(addr) phys_to_virt(addr)
#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

#define KEXEC_SEGMENT_MAX 16
struct kexec_segment {
	void __user *buf;
	size_t bufsz;
	unsigned long mem;	/* User space sees this as a (void *) ... */
	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 kimage {
	kimage_entry_t head;
	kimage_entry_t *entry;
	kimage_entry_t *last_entry;

	unsigned long destination;

	unsigned long start;
	struct page *control_code_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 unuseable_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
};



/* kexec interface functions */
extern NORET_TYPE void machine_kexec(struct kimage *image) ATTRIB_NORET;
extern int machine_kexec_prepare(struct kimage *image);
extern void machine_kexec_cleanup(struct kimage *image);
#ifdef CONFIG_XEN
extern int xen_machine_kexec_load(struct kimage *image);
extern void xen_machine_kexec_unload(struct kimage *image);
extern void xen_machine_kexec_setup_resources(void);
extern void xen_machine_kexec_register_resources(struct resource *res);
#endif
extern asmlinkage long sys_kexec_load(unsigned long entry,
					unsigned long nr_segments,
					struct kexec_segment __user *segments,
					unsigned long flags);
#ifdef CONFIG_COMPAT
extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
				unsigned long nr_segments,
				struct compat_kexec_segment __user *segments,
				unsigned long flags);
#endif
extern struct page *kimage_alloc_control_pages(struct kimage *image,
						unsigned int order);
extern void crash_kexec(struct pt_regs *);
int kexec_should_crash(struct task_struct *);
void crash_save_vmcoreinfo(void);
void arch_crash_save_vmcoreinfo(void);
void vmcoreinfo_append_str(const char *fmt, ...)
	__attribute__ ((format (printf, 1, 2)));
unsigned long paddr_vmcoreinfo_note(void);

#define SYMBOL(name) \
	vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
#define SIZE(name) \
	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
			     (unsigned long)sizeof(struct name))
#define TYPEDEF_SIZE(name) \
	vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
			     (unsigned long)sizeof(name))

#define OFFSET(name, field) \
	vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
			     (unsigned long)&(((struct name *)0)->field))
#define LENGTH(name, value) \
	vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
#define NUMBER(name) \
	vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
#define CONFIG(name) \
	vmcoreinfo_append_str("CONFIG_%s=y\n", #name)


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

#ifndef kexec_flush_icache_page
#define kexec_flush_icache_page(page)
#endif

#define KEXEC_ON_CRASH  0x00000001
#define KEXEC_ARCH_MASK 0xffff0000

/* These values match the ELF architecture values.
 * Unless there is a good reason that should continue to be the case.
 */
#define KEXEC_ARCH_DEFAULT ( 0 << 16)
#define KEXEC_ARCH_386     ( 3 << 16)
#define KEXEC_ARCH_X86_64  (62 << 16)
#define KEXEC_ARCH_PPC     (20 << 16)
#define KEXEC_ARCH_PPC64   (21 << 16)
#define KEXEC_ARCH_IA_64   (50 << 16)
#define KEXEC_ARCH_S390    (22 << 16)
#define KEXEC_ARCH_SH      (42 << 16)

#define KEXEC_FLAGS    (KEXEC_ON_CRASH)  /* List of defined/legal kexec flags */

#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;
typedef u32 note_buf_t[MAX_NOTE_BYTES/4];
extern note_buf_t *crash_notes;

extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
extern size_t vmcoreinfo_size;
extern size_t vmcoreinfo_max_size;

#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; }
#define SYMBOL(x)
#endif /* CONFIG_KEXEC */
#endif /* LINUX_KEXEC_H */