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/device.h>
7 #include <linux/proc_fs.h>
9 #define ELFCORE_ADDR_MAX (-1ULL)
10 #define ELFCORE_ADDR_ERR (-2ULL)
12 extern unsigned long long elfcorehdr_addr
;
13 extern unsigned long long elfcorehdr_size
;
15 extern ssize_t
copy_oldmem_page(unsigned long, char *, size_t,
18 /* Architecture code defines this if there are other possible ELF
19 * machine types, e.g. on bi-arch capable hardware. */
20 #ifndef vmcore_elf_check_arch_cross
21 #define vmcore_elf_check_arch_cross(x) 0
25 * Architecture code can redefine this if there are any special checks
26 * needed for 64-bit ELF vmcores. In case of 32-bit only architecture,
27 * this can be set to zero.
29 #ifndef vmcore_elf64_check_arch
30 #define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
34 * is_kdump_kernel() checks whether this kernel is booting after a panic of
35 * previous kernel or not. This is determined by checking if previous kernel
36 * has passed the elf core header address on command line.
38 * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will
39 * return 1 if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic of
43 static inline int is_kdump_kernel(void)
45 return (elfcorehdr_addr
!= ELFCORE_ADDR_MAX
) ? 1 : 0;
48 /* is_vmcore_usable() checks if the kernel is booting after a panic and
49 * the vmcore region is usable.
51 * This makes use of the fact that due to alignment -2ULL is not
52 * a valid pointer, much in the vain of IS_ERR(), except
53 * dealing directly with an unsigned long long rather than a pointer.
56 static inline int is_vmcore_usable(void)
58 return is_kdump_kernel() && elfcorehdr_addr
!= ELFCORE_ADDR_ERR
? 1 : 0;
61 /* vmcore_unusable() marks the vmcore as unusable,
62 * without disturbing the logic of is_kdump_kernel()
65 static inline void vmcore_unusable(void)
67 if (is_kdump_kernel())
68 elfcorehdr_addr
= ELFCORE_ADDR_ERR
;
71 #define HAVE_OLDMEM_PFN_IS_RAM 1
72 extern int register_oldmem_pfn_is_ram(int (*fn
)(unsigned long pfn
));
73 extern void unregister_oldmem_pfn_is_ram(void);
75 #else /* !CONFIG_CRASH_DUMP */
76 static inline int is_kdump_kernel(void) { return 0; }
77 #endif /* CONFIG_CRASH_DUMP */
79 extern unsigned long saved_max_pfn
;
80 #endif /* LINUX_CRASHDUMP_H */
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