1 #ifndef LINUX_CRASH_DUMP_H
2 #define LINUX_CRASH_DUMP_H
4 #ifdef CONFIG_CRASH_DUMP
5 #include <linux/kexec.h>
6 #include <linux/proc_fs.h>
9 #include <asm/pgtable.h> /* for pgprot_t */
11 #define ELFCORE_ADDR_MAX (-1ULL)
12 #define ELFCORE_ADDR_ERR (-2ULL)
14 extern unsigned long long elfcorehdr_addr
;
15 extern unsigned long long elfcorehdr_size
;
17 extern int elfcorehdr_alloc(unsigned long long *addr
, unsigned long long *size
);
18 extern void elfcorehdr_free(unsigned long long addr
);
19 extern ssize_t
elfcorehdr_read(char *buf
, size_t count
, u64
*ppos
);
20 extern ssize_t
elfcorehdr_read_notes(char *buf
, size_t count
, u64
*ppos
);
21 extern int remap_oldmem_pfn_range(struct vm_area_struct
*vma
,
22 unsigned long from
, unsigned long pfn
,
23 unsigned long size
, pgprot_t prot
);
25 extern ssize_t
copy_oldmem_page(unsigned long, char *, size_t,
27 void vmcore_cleanup(void);
29 /* Architecture code defines this if there are other possible ELF
30 * machine types, e.g. on bi-arch capable hardware. */
31 #ifndef vmcore_elf_check_arch_cross
32 #define vmcore_elf_check_arch_cross(x) 0
36 * Architecture code can redefine this if there are any special checks
37 * needed for 64-bit ELF vmcores. In case of 32-bit only architecture,
38 * this can be set to zero.
40 #ifndef vmcore_elf64_check_arch
41 #define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
45 * is_kdump_kernel() checks whether this kernel is booting after a panic of
46 * previous kernel or not. This is determined by checking if previous kernel
47 * has passed the elf core header address on command line.
49 * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will
50 * return 1 if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic of
54 static inline int is_kdump_kernel(void)
56 return (elfcorehdr_addr
!= ELFCORE_ADDR_MAX
) ? 1 : 0;
59 /* is_vmcore_usable() checks if the kernel is booting after a panic and
60 * the vmcore region is usable.
62 * This makes use of the fact that due to alignment -2ULL is not
63 * a valid pointer, much in the vain of IS_ERR(), except
64 * dealing directly with an unsigned long long rather than a pointer.
67 static inline int is_vmcore_usable(void)
69 return is_kdump_kernel() && elfcorehdr_addr
!= ELFCORE_ADDR_ERR
? 1 : 0;
72 /* vmcore_unusable() marks the vmcore as unusable,
73 * without disturbing the logic of is_kdump_kernel()
76 static inline void vmcore_unusable(void)
78 if (is_kdump_kernel())
79 elfcorehdr_addr
= ELFCORE_ADDR_ERR
;
82 #define HAVE_OLDMEM_PFN_IS_RAM 1
83 extern int register_oldmem_pfn_is_ram(int (*fn
)(unsigned long pfn
));
84 extern void unregister_oldmem_pfn_is_ram(void);
86 #else /* !CONFIG_CRASH_DUMP */
87 static inline int is_kdump_kernel(void) { return 0; }
88 #endif /* CONFIG_CRASH_DUMP */
90 extern unsigned long saved_max_pfn
;
91 #endif /* LINUX_CRASHDUMP_H */
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