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60e64d46 VG |
1 | #ifndef LINUX_CRASH_DUMP_H |
2 | #define LINUX_CRASH_DUMP_H | |
3 | ||
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> | |
9 | ||
666bfddb | 10 | #define ELFCORE_ADDR_MAX (-1ULL) |
85a0ee34 | 11 | #define ELFCORE_ADDR_ERR (-2ULL) |
36ac2617 | 12 | |
2030eae5 | 13 | extern unsigned long long elfcorehdr_addr; |
36ac2617 | 14 | |
60e64d46 VG |
15 | extern ssize_t copy_oldmem_page(unsigned long, char *, size_t, |
16 | unsigned long, int); | |
666bfddb | 17 | |
79e03011 IC |
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 | |
22 | #endif | |
23 | ||
24 | #define vmcore_elf_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x)) | |
25 | ||
57cac4d1 VG |
26 | /* |
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. | |
30 | * | |
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 | |
33 | * previous kernel. | |
34 | */ | |
35 | ||
95b68dec C |
36 | static inline int is_kdump_kernel(void) |
37 | { | |
38 | return (elfcorehdr_addr != ELFCORE_ADDR_MAX) ? 1 : 0; | |
39 | } | |
85a0ee34 SH |
40 | |
41 | /* is_vmcore_usable() checks if the kernel is booting after a panic and | |
42 | * the vmcore region is usable. | |
43 | * | |
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. | |
47 | */ | |
48 | ||
49 | static inline int is_vmcore_usable(void) | |
50 | { | |
51 | return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0; | |
52 | } | |
53 | ||
54 | /* vmcore_unusable() marks the vmcore as unusable, | |
55 | * without disturbing the logic of is_kdump_kernel() | |
56 | */ | |
57 | ||
58 | static inline void vmcore_unusable(void) | |
59 | { | |
60 | if (is_kdump_kernel()) | |
61 | elfcorehdr_addr = ELFCORE_ADDR_ERR; | |
62 | } | |
95b68dec C |
63 | #else /* !CONFIG_CRASH_DUMP */ |
64 | static inline int is_kdump_kernel(void) { return 0; } | |
60e64d46 | 65 | #endif /* CONFIG_CRASH_DUMP */ |
95b68dec C |
66 | |
67 | extern unsigned long saved_max_pfn; | |
60e64d46 | 68 | #endif /* LINUX_CRASHDUMP_H */ |