#ifndef LINUX_KEXEC_H
  #define LINUX_KEXEC_H
  
  #ifdef CONFIG_KEXEC
  #include <linux/types.h>
  #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 <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.
   */
  #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) +		\
  			    KEXEC_CORE_NOTE_NAME_BYTES +		\
  			    KEXEC_CORE_NOTE_DESC_BYTES )

  /*
   * 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;

  	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 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

  	unsigned int preserve_context : 1;

  
  #ifdef ARCH_HAS_KIMAGE_ARCH
  	struct kimage_arch arch;
  #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);

  #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_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
  ", value)

  #define VMCOREINFO_PAGESIZE(value) \
  	vmcoreinfo_append_str("PAGESIZE=%ld
  ", value)

  #define VMCOREINFO_SYMBOL(name) \

  	vmcoreinfo_append_str("SYMBOL(%s)=%lx
  ", #name, (unsigned long)&name)

  #define VMCOREINFO_SIZE(name) \

  	vmcoreinfo_append_str("SIZE(%s)=%lu
  ", #name, \

  			      (unsigned long)sizeof(name))

  #define VMCOREINFO_STRUCT_SIZE(name) \
  	vmcoreinfo_append_str("SIZE(%s)=%lu
  ", #name, \
  			      (unsigned long)sizeof(struct name))

  #define VMCOREINFO_OFFSET(name, field) \

  	vmcoreinfo_append_str("OFFSET(%s.%s)=%lu
  ", #name, #field, \

  			      (unsigned long)offsetof(struct name, field))

  #define VMCOREINFO_LENGTH(name, value) \

  	vmcoreinfo_append_str("LENGTH(%s)=%lu
  ", #name, (unsigned long)value)

  #define VMCOREINFO_NUMBER(name) \

  	vmcoreinfo_append_str("NUMBER(%s)=%ld
  ", #name, (long)name)

  #define VMCOREINFO_CONFIG(name) \

  	vmcoreinfo_append_str("CONFIG_%s=y
  ", #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_PRESERVE_CONTEXT	0x00000002
  #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_ARM     (40 << 16)

  #define KEXEC_ARCH_S390    (22 << 16)

  #define KEXEC_ARCH_SH      (42 << 16)

  #define KEXEC_ARCH_MIPS_LE (10 << 16)
  #define KEXEC_ARCH_MIPS    ( 8 << 16)

  /* 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

  #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[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;

  int __init parse_crashkernel(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 */