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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
60e64d46 VG |
2 | #ifndef LINUX_CRASH_DUMP_H |
3 | #define LINUX_CRASH_DUMP_H | |
4 | ||
5 | #ifdef CONFIG_CRASH_DUMP | |
6 | #include <linux/kexec.h> | |
60e64d46 | 7 | #include <linux/proc_fs.h> |
1f536b9e | 8 | #include <linux/elf.h> |
60e64d46 | 9 | |
5a610fcc QY |
10 | #include <asm/pgtable.h> /* for pgprot_t */ |
11 | ||
666bfddb | 12 | #define ELFCORE_ADDR_MAX (-1ULL) |
85a0ee34 | 13 | #define ELFCORE_ADDR_ERR (-2ULL) |
36ac2617 | 14 | |
2030eae5 | 15 | extern unsigned long long elfcorehdr_addr; |
d3bf3795 | 16 | extern unsigned long long elfcorehdr_size; |
36ac2617 | 17 | |
5ab03ac5 BH |
18 | extern int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size); |
19 | extern void elfcorehdr_free(unsigned long long addr); | |
20 | extern ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos); | |
21 | extern ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos); | |
22 | extern int remap_oldmem_pfn_range(struct vm_area_struct *vma, | |
23 | unsigned long from, unsigned long pfn, | |
24 | unsigned long size, pgprot_t prot); | |
be8a8d06 | 25 | |
60e64d46 VG |
26 | extern ssize_t copy_oldmem_page(unsigned long, char *, size_t, |
27 | unsigned long, int); | |
82e0703b | 28 | void vmcore_cleanup(void); |
666bfddb | 29 | |
79e03011 IC |
30 | /* Architecture code defines this if there are other possible ELF |
31 | * machine types, e.g. on bi-arch capable hardware. */ | |
32 | #ifndef vmcore_elf_check_arch_cross | |
33 | #define vmcore_elf_check_arch_cross(x) 0 | |
34 | #endif | |
35 | ||
9833c394 MW |
36 | /* |
37 | * Architecture code can redefine this if there are any special checks | |
e55d5312 DW |
38 | * needed for 32-bit ELF or 64-bit ELF vmcores. In case of 32-bit |
39 | * only architecture, vmcore_elf64_check_arch can be set to zero. | |
9833c394 | 40 | */ |
e55d5312 DW |
41 | #ifndef vmcore_elf32_check_arch |
42 | #define vmcore_elf32_check_arch(x) elf_check_arch(x) | |
43 | #endif | |
44 | ||
9833c394 MW |
45 | #ifndef vmcore_elf64_check_arch |
46 | #define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x)) | |
47 | #endif | |
79e03011 | 48 | |
57cac4d1 VG |
49 | /* |
50 | * is_kdump_kernel() checks whether this kernel is booting after a panic of | |
51 | * previous kernel or not. This is determined by checking if previous kernel | |
52 | * has passed the elf core header address on command line. | |
53 | * | |
54 | * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will | |
55 | * return 1 if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic of | |
56 | * previous kernel. | |
57 | */ | |
58 | ||
95b68dec C |
59 | static inline int is_kdump_kernel(void) |
60 | { | |
61 | return (elfcorehdr_addr != ELFCORE_ADDR_MAX) ? 1 : 0; | |
62 | } | |
85a0ee34 SH |
63 | |
64 | /* is_vmcore_usable() checks if the kernel is booting after a panic and | |
65 | * the vmcore region is usable. | |
66 | * | |
67 | * This makes use of the fact that due to alignment -2ULL is not | |
68 | * a valid pointer, much in the vain of IS_ERR(), except | |
69 | * dealing directly with an unsigned long long rather than a pointer. | |
70 | */ | |
71 | ||
72 | static inline int is_vmcore_usable(void) | |
73 | { | |
74 | return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0; | |
75 | } | |
76 | ||
77 | /* vmcore_unusable() marks the vmcore as unusable, | |
78 | * without disturbing the logic of is_kdump_kernel() | |
79 | */ | |
80 | ||
81 | static inline void vmcore_unusable(void) | |
82 | { | |
83 | if (is_kdump_kernel()) | |
84 | elfcorehdr_addr = ELFCORE_ADDR_ERR; | |
85 | } | |
997c136f OH |
86 | |
87 | #define HAVE_OLDMEM_PFN_IS_RAM 1 | |
88 | extern int register_oldmem_pfn_is_ram(int (*fn)(unsigned long pfn)); | |
89 | extern void unregister_oldmem_pfn_is_ram(void); | |
90 | ||
95b68dec C |
91 | #else /* !CONFIG_CRASH_DUMP */ |
92 | static inline int is_kdump_kernel(void) { return 0; } | |
60e64d46 | 93 | #endif /* CONFIG_CRASH_DUMP */ |
95b68dec C |
94 | |
95 | extern unsigned long saved_max_pfn; | |
60e64d46 | 96 | #endif /* LINUX_CRASHDUMP_H */ |