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#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 <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_CODE_SIZE
#error KEXEC_CONTROL_CODE_SIZE not defined
#endif
#ifndef KEXEC_ARCH
#error KEXEC_ARCH not defined
#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 8
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);
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 *);
extern struct kimage *kexec_image;
#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_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */
/* Location of a reserved region to hold the crash kernel.
*/
extern struct resource crashk_res;
#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 */
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