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/smp_lock.h>
7 #include <linux/device.h>
8 #include <linux/proc_fs.h>
10 #define ELFCORE_ADDR_MAX (-1ULL)
11 #define ELFCORE_ADDR_ERR (-2ULL)
13 extern unsigned long long elfcorehdr_addr
;
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
24 #define vmcore_elf_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
27 * is_kdump_kernel() checks whether this kernel is booting after a panic of
28 * previous kernel or not. This is determined by checking if previous kernel
29 * has passed the elf core header address on command line.
31 * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will
32 * return 1 if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic of
36 static inline int is_kdump_kernel(void)
38 return (elfcorehdr_addr
!= ELFCORE_ADDR_MAX
) ? 1 : 0;
41 /* is_vmcore_usable() checks if the kernel is booting after a panic and
42 * the vmcore region is usable.
44 * This makes use of the fact that due to alignment -2ULL is not
45 * a valid pointer, much in the vain of IS_ERR(), except
46 * dealing directly with an unsigned long long rather than a pointer.
49 static inline int is_vmcore_usable(void)
51 return is_kdump_kernel() && elfcorehdr_addr
!= ELFCORE_ADDR_ERR
? 1 : 0;
54 /* vmcore_unusable() marks the vmcore as unusable,
55 * without disturbing the logic of is_kdump_kernel()
58 static inline void vmcore_unusable(void)
60 if (is_kdump_kernel())
61 elfcorehdr_addr
= ELFCORE_ADDR_ERR
;
63 #else /* !CONFIG_CRASH_DUMP */
64 static inline int is_kdump_kernel(void) { return 0; }
65 #endif /* CONFIG_CRASH_DUMP */
67 extern unsigned long saved_max_pfn
;
68 #endif /* LINUX_CRASHDUMP_H */
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