Commit | Line | Data |
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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> | |
60e64d46 | 6 | #include <linux/proc_fs.h> |
1f536b9e | 7 | #include <linux/elf.h> |
60e64d46 | 8 | |
666bfddb | 9 | #define ELFCORE_ADDR_MAX (-1ULL) |
85a0ee34 | 10 | #define ELFCORE_ADDR_ERR (-2ULL) |
36ac2617 | 11 | |
2030eae5 | 12 | extern unsigned long long elfcorehdr_addr; |
d3bf3795 | 13 | extern unsigned long long elfcorehdr_size; |
36ac2617 | 14 | |
be8a8d06 MH |
15 | extern int __weak elfcorehdr_alloc(unsigned long long *addr, |
16 | unsigned long long *size); | |
17 | extern void __weak elfcorehdr_free(unsigned long long addr); | |
18 | extern ssize_t __weak elfcorehdr_read(char *buf, size_t count, u64 *ppos); | |
19 | extern ssize_t __weak elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos); | |
9cb21813 MH |
20 | extern int __weak remap_oldmem_pfn_range(struct vm_area_struct *vma, |
21 | unsigned long from, unsigned long pfn, | |
22 | unsigned long size, pgprot_t prot); | |
be8a8d06 | 23 | |
60e64d46 VG |
24 | extern ssize_t copy_oldmem_page(unsigned long, char *, size_t, |
25 | unsigned long, int); | |
666bfddb | 26 | |
79e03011 IC |
27 | /* Architecture code defines this if there are other possible ELF |
28 | * machine types, e.g. on bi-arch capable hardware. */ | |
29 | #ifndef vmcore_elf_check_arch_cross | |
30 | #define vmcore_elf_check_arch_cross(x) 0 | |
31 | #endif | |
32 | ||
9833c394 MW |
33 | /* |
34 | * Architecture code can redefine this if there are any special checks | |
35 | * needed for 64-bit ELF vmcores. In case of 32-bit only architecture, | |
36 | * this can be set to zero. | |
37 | */ | |
38 | #ifndef vmcore_elf64_check_arch | |
39 | #define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x)) | |
40 | #endif | |
79e03011 | 41 | |
57cac4d1 VG |
42 | /* |
43 | * is_kdump_kernel() checks whether this kernel is booting after a panic of | |
44 | * previous kernel or not. This is determined by checking if previous kernel | |
45 | * has passed the elf core header address on command line. | |
46 | * | |
47 | * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will | |
48 | * return 1 if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic of | |
49 | * previous kernel. | |
50 | */ | |
51 | ||
95b68dec C |
52 | static inline int is_kdump_kernel(void) |
53 | { | |
54 | return (elfcorehdr_addr != ELFCORE_ADDR_MAX) ? 1 : 0; | |
55 | } | |
85a0ee34 SH |
56 | |
57 | /* is_vmcore_usable() checks if the kernel is booting after a panic and | |
58 | * the vmcore region is usable. | |
59 | * | |
60 | * This makes use of the fact that due to alignment -2ULL is not | |
61 | * a valid pointer, much in the vain of IS_ERR(), except | |
62 | * dealing directly with an unsigned long long rather than a pointer. | |
63 | */ | |
64 | ||
65 | static inline int is_vmcore_usable(void) | |
66 | { | |
67 | return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0; | |
68 | } | |
69 | ||
70 | /* vmcore_unusable() marks the vmcore as unusable, | |
71 | * without disturbing the logic of is_kdump_kernel() | |
72 | */ | |
73 | ||
74 | static inline void vmcore_unusable(void) | |
75 | { | |
76 | if (is_kdump_kernel()) | |
77 | elfcorehdr_addr = ELFCORE_ADDR_ERR; | |
78 | } | |
997c136f OH |
79 | |
80 | #define HAVE_OLDMEM_PFN_IS_RAM 1 | |
81 | extern int register_oldmem_pfn_is_ram(int (*fn)(unsigned long pfn)); | |
82 | extern void unregister_oldmem_pfn_is_ram(void); | |
83 | ||
95b68dec C |
84 | #else /* !CONFIG_CRASH_DUMP */ |
85 | static inline int is_kdump_kernel(void) { return 0; } | |
60e64d46 | 86 | #endif /* CONFIG_CRASH_DUMP */ |
95b68dec C |
87 | |
88 | extern unsigned long saved_max_pfn; | |
60e64d46 | 89 | #endif /* LINUX_CRASHDUMP_H */ |