include/linux/crash_dump.h


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#ifndef LINUX_CRASH_DUMP_H
#define LINUX_CRASH_DUMP_H

#ifdef CONFIG_CRASH_DUMP
#include <linux/kexec.h>
#include <linux/proc_fs.h>
#include <linux/elf.h>

#define ELFCORE_ADDR_MAX	(-1ULL)
#define ELFCORE_ADDR_ERR	(-2ULL)

extern unsigned long long elfcorehdr_addr;
extern unsigned long long elfcorehdr_size;

extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
						unsigned long, int);

#ifndef vmcore_elf_check_arch_cross
#define vmcore_elf_check_arch_cross(x) 0
#endif

#ifndef vmcore_elf64_check_arch
#define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
#endif


static inline int is_kdump_kernel(void)
{
	return (elfcorehdr_addr != ELFCORE_ADDR_MAX) ? 1 : 0;
}


static inline int is_vmcore_usable(void)
{
	return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0;
}


static inline void vmcore_unusable(void)
{
	if (is_kdump_kernel())
		elfcorehdr_addr = ELFCORE_ADDR_ERR;
}

#define HAVE_OLDMEM_PFN_IS_RAM 1
extern int register_oldmem_pfn_is_ram(int (*fn)(unsigned long pfn));
extern void unregister_oldmem_pfn_is_ram(void);

#else 
static inline int is_kdump_kernel(void) { return 0; }
#endif 

extern unsigned long saved_max_pfn;
#endif